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All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module utils/ckeditorerror\n */\n\n/* globals console */\n\n/**\n * URL to the documentation with error codes.\n */\nexport const DOCUMENTATION_URL =\n\t'https://ckeditor.com/docs/ckeditor5/latest/framework/guides/support/error-codes.html';\n\n/**\n * The CKEditor error class.\n *\n * You should throw `CKEditorError` when:\n *\n * * An unexpected situation occurred and the editor (most probably) will not work properly. Such exception will be handled\n * by the {@link module:watchdog/watchdog~Watchdog watchdog} (if it is integrated),\n * * If the editor is incorrectly integrated or the editor API is used in the wrong way. This way you will give\n * feedback to the developer as soon as possible. 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Undefined if none was passed.\n\t\t *\n\t\t * @type {Object|undefined}\n\t\t */\n\t\tthis.data = data;\n\t}\n\n\t/**\n\t * Checks if the error is of the `CKEditorError` type.\n\t */\n\tis( type ) {\n\t\treturn type === 'CKEditorError';\n\t}\n\n\t/**\n\t * A utility that ensures that the thrown error is a {@link module:utils/ckeditorerror~CKEditorError} one.\n\t * It is useful when combined with the {@link module:watchdog/watchdog~Watchdog} feature, which can restart the editor in case\n\t * of a {@link module:utils/ckeditorerror~CKEditorError} error.\n\t *\n\t * @static\n\t * @param {Error} err The error to rethrow.\n\t * @param {Object} context An object connected through properties with the editor instance. This context will be used\n\t * by the watchdog to verify which editor should be restarted.\n\t */\n\tstatic rethrowUnexpectedError( err, context ) {\n\t\tif ( err.is && err.is( 'CKEditorError' ) ) {\n\t\t\tthrow err;\n\t\t}\n\n\t\t/**\n\t\t * An unexpected error occurred inside the CKEditor 5 codebase. This error will look like the original one\n\t\t * to make the debugging easier.\n\t\t *\n\t\t * This error is only useful when the editor is initialized using the {@link module:watchdog/watchdog~Watchdog} feature.\n\t\t * In case of such error (or any {@link module:utils/ckeditorerror~CKEditorError} error) the watchdog should restart the editor.\n\t\t *\n\t\t * @error unexpected-error\n\t\t */\n\t\tconst error = new CKEditorError( err.message, context );\n\n\t\t// Restore the original stack trace to make the error look like the original one.\n\t\t// See https://github.com/ckeditor/ckeditor5/issues/5595 for more details.\n\t\terror.stack = err.stack;\n\n\t\tthrow error;\n\t}\n}\n\n/**\n * Logs a warning to the console with a properly formatted message and adds a link to the documentation.\n * Use whenever you want to log a warning to the console.\n *\n *\t\t/**\n *\t\t * There was a problem processing the configuration of the toolbar. The item with the given\n *\t\t * name does not exist, so it was omitted when rendering the toolbar.\n *\t\t *\n *\t\t * @error toolbarview-item-unavailable\n *\t\t * @param {String} name The name of the component.\n *\t\t * /\n *\t\tlogWarning( 'toolbarview-item-unavailable', { name } );\n *\n * See also {@link module:utils/ckeditorerror~CKEditorError} for an explanation when to throw an error and when to log\n * a warning or an error to the console.\n *\n * @param {String} errorName The error name to be logged.\n * @param {Object} [data] Additional data to be logged.\n * @returns {String}\n */\nexport function logWarning( errorName, data ) {\n\tconsole.warn( ...formatConsoleArguments( errorName, data ) );\n}\n\n/**\n * Logs an error to the console with a properly formatted message and adds a link to the documentation.\n * Use whenever you want to log an error to the console.\n *\n *\t\t/**\n *\t\t * There was a problem processing the configuration of the toolbar. The item with the given\n *\t\t * name does not exist, so it was omitted when rendering the toolbar.\n *\t\t *\n *\t\t * @error toolbarview-item-unavailable\n *\t\t * @param {String} name The name of the component.\n *\t\t * /\n *\t\t logError( 'toolbarview-item-unavailable', { name } );\n *\n * **Note**: In most cases logging a warning using {@link module:utils/ckeditorerror~logWarning} is enough.\n *\n * See also {@link module:utils/ckeditorerror~CKEditorError} for an explanation when to use each method.\n *\n * @param {String} errorName The error name to be logged.\n * @param {Object} [data] Additional data to be logged.\n * @returns {String}\n */\nexport function logError( errorName, data ) {\n\tconsole.error( ...formatConsoleArguments( errorName, data ) );\n}\n\nfunction getLinkToDocumentationMessage( errorName ) {\n\treturn `\\nRead more: ${ DOCUMENTATION_URL }#error-${ errorName }`;\n}\n\nfunction formatConsoleArguments( errorName, data ) {\n\tconst documentationMessage = getLinkToDocumentationMessage( errorName );\n\n\treturn data ? [ errorName, data, documentationMessage ] : [ errorName, documentationMessage ];\n}\n","\"use strict\";\n\nvar isOldIE = function isOldIE() {\n  var memo;\n  return function memorize() {\n    if (typeof memo === 'undefined') {\n      // Test for IE <= 9 as proposed by Browserhacks\n      // @see http://browserhacks.com/#hack-e71d8692f65334173fee715c222cb805\n      // Tests for existence of standard globals is to allow style-loader\n      // to operate correctly into non-standard environments\n      // @see https://github.com/webpack-contrib/style-loader/issues/177\n      memo = Boolean(window && document && document.all && !window.atob);\n    }\n\n    return memo;\n  };\n}();\n\nvar getTarget = function getTarget() {\n  var memo = {};\n  return function memorize(target) {\n    if (typeof memo[target] === 'undefined') {\n      var styleTarget = document.querySelector(target); // Special case to return head of iframe instead of iframe itself\n\n      if (window.HTMLIFrameElement && styleTarget instanceof window.HTMLIFrameElement) {\n        try {\n          // This will throw an exception if access to iframe is blocked\n          // due to cross-origin restrictions\n          styleTarget = styleTarget.contentDocument.head;\n        } catch (e) {\n          // istanbul ignore next\n          styleTarget = null;\n        }\n      }\n\n      memo[target] = styleTarget;\n    }\n\n    return memo[target];\n  };\n}();\n\nvar stylesInDom = [];\n\nfunction getIndexByIdentifier(identifier) {\n  var result = -1;\n\n  for (var i = 0; i < stylesInDom.length; i++) {\n    if (stylesInDom[i].identifier === identifier) {\n      result = i;\n      break;\n    }\n  }\n\n  return result;\n}\n\nfunction modulesToDom(list, options) {\n  var idCountMap = {};\n  var identifiers = [];\n\n  for (var i = 0; i < list.length; i++) {\n    var item = list[i];\n    var id = options.base ? item[0] + options.base : item[0];\n    var count = idCountMap[id] || 0;\n    var identifier = \"\".concat(id, \" \").concat(count);\n    idCountMap[id] = count + 1;\n    var index = getIndexByIdentifier(identifier);\n    var obj = {\n      css: item[1],\n      media: item[2],\n      sourceMap: item[3]\n    };\n\n    if (index !== -1) {\n      stylesInDom[index].references++;\n      stylesInDom[index].updater(obj);\n    } else {\n      stylesInDom.push({\n        identifier: identifier,\n        updater: addStyle(obj, options),\n        references: 1\n      });\n    }\n\n    identifiers.push(identifier);\n  }\n\n  return identifiers;\n}\n\nfunction insertStyleElement(options) {\n  var style = document.createElement('style');\n  var attributes = options.attributes || {};\n\n  if (typeof attributes.nonce === 'undefined') {\n    var nonce = typeof __webpack_nonce__ !== 'undefined' ? __webpack_nonce__ : null;\n\n    if (nonce) {\n      attributes.nonce = nonce;\n    }\n  }\n\n  Object.keys(attributes).forEach(function (key) {\n    style.setAttribute(key, attributes[key]);\n  });\n\n  if (typeof options.insert === 'function') {\n    options.insert(style);\n  } else {\n    var target = getTarget(options.insert || 'head');\n\n    if (!target) {\n      throw new Error(\"Couldn't find a style target. This probably means that the value for the 'insert' parameter is invalid.\");\n    }\n\n    target.appendChild(style);\n  }\n\n  return style;\n}\n\nfunction removeStyleElement(style) {\n  // istanbul ignore if\n  if (style.parentNode === null) {\n    return false;\n  }\n\n  style.parentNode.removeChild(style);\n}\n/* istanbul ignore next  */\n\n\nvar replaceText = function replaceText() {\n  var textStore = [];\n  return function replace(index, replacement) {\n    textStore[index] = replacement;\n    return textStore.filter(Boolean).join('\\n');\n  };\n}();\n\nfunction applyToSingletonTag(style, index, remove, obj) {\n  var css = remove ? '' : obj.media ? \"@media \".concat(obj.media, \" {\").concat(obj.css, \"}\") : obj.css; // For old IE\n\n  /* istanbul ignore if  */\n\n  if (style.styleSheet) {\n    style.styleSheet.cssText = replaceText(index, css);\n  } else {\n    var cssNode = document.createTextNode(css);\n    var childNodes = style.childNodes;\n\n    if (childNodes[index]) {\n      style.removeChild(childNodes[index]);\n    }\n\n    if (childNodes.length) {\n      style.insertBefore(cssNode, childNodes[index]);\n    } else {\n      style.appendChild(cssNode);\n    }\n  }\n}\n\nfunction applyToTag(style, options, obj) {\n  var css = obj.css;\n  var media = obj.media;\n  var sourceMap = obj.sourceMap;\n\n  if (media) {\n    style.setAttribute('media', media);\n  } else {\n    style.removeAttribute('media');\n  }\n\n  if (sourceMap && typeof btoa !== 'undefined') {\n    css += \"\\n/*# sourceMappingURL=data:application/json;base64,\".concat(btoa(unescape(encodeURIComponent(JSON.stringify(sourceMap)))), \" */\");\n  } // For old IE\n\n  /* istanbul ignore if  */\n\n\n  if (style.styleSheet) {\n    style.styleSheet.cssText = css;\n  } else {\n    while (style.firstChild) {\n      style.removeChild(style.firstChild);\n    }\n\n    style.appendChild(document.createTextNode(css));\n  }\n}\n\nvar singleton = null;\nvar singletonCounter = 0;\n\nfunction addStyle(obj, options) {\n  var style;\n  var update;\n  var remove;\n\n  if (options.singleton) {\n    var styleIndex = singletonCounter++;\n    style = singleton || (singleton = insertStyleElement(options));\n    update = applyToSingletonTag.bind(null, style, styleIndex, false);\n    remove = applyToSingletonTag.bind(null, style, styleIndex, true);\n  } else {\n    style = insertStyleElement(options);\n    update = applyToTag.bind(null, style, options);\n\n    remove = function remove() {\n      removeStyleElement(style);\n    };\n  }\n\n  update(obj);\n  return function updateStyle(newObj) {\n    if (newObj) {\n      if (newObj.css === obj.css && newObj.media === obj.media && newObj.sourceMap === obj.sourceMap) {\n        return;\n      }\n\n      update(obj = newObj);\n    } else {\n      remove();\n    }\n  };\n}\n\nmodule.exports = function (list, options) {\n  options = options || {}; // Force single-tag solution on IE6-9, which has a hard limit on the # of <style>\n  // tags it will allow on a page\n\n  if (!options.singleton && typeof options.singleton !== 'boolean') {\n    options.singleton = isOldIE();\n  }\n\n  list = list || [];\n  var lastIdentifiers = modulesToDom(list, options);\n  return function update(newList) {\n    newList = newList || [];\n\n    if (Object.prototype.toString.call(newList) !== '[object Array]') {\n      return;\n    }\n\n    for (var i = 0; i < lastIdentifiers.length; i++) {\n      var identifier = lastIdentifiers[i];\n      var index = getIndexByIdentifier(identifier);\n      stylesInDom[index].references--;\n    }\n\n    var newLastIdentifiers = modulesToDom(newList, options);\n\n    for (var _i = 0; _i < lastIdentifiers.length; _i++) {\n      var _identifier = lastIdentifiers[_i];\n\n      var _index = getIndexByIdentifier(_identifier);\n\n      if (stylesInDom[_index].references === 0) {\n        stylesInDom[_index].updater();\n\n        stylesInDom.splice(_index, 1);\n      }\n    }\n\n    lastIdentifiers = newLastIdentifiers;\n  };\n};","\"use strict\";\n\nfunction _slicedToArray(arr, i) { return _arrayWithHoles(arr) || _iterableToArrayLimit(arr, i) || _unsupportedIterableToArray(arr, i) || _nonIterableRest(); }\n\nfunction _nonIterableRest() { throw new TypeError(\"Invalid attempt to destructure non-iterable instance.\\nIn order to be iterable, non-array objects must have a [Symbol.iterator]() method.\"); }\n\nfunction _unsupportedIterableToArray(o, minLen) { if (!o) return; if (typeof o === \"string\") return _arrayLikeToArray(o, minLen); var n = Object.prototype.toString.call(o).slice(8, -1); if (n === \"Object\" && o.constructor) n = o.constructor.name; if (n === \"Map\" || n === \"Set\") return Array.from(o); if (n === \"Arguments\" || /^(?:Ui|I)nt(?:8|16|32)(?:Clamped)?Array$/.test(n)) return _arrayLikeToArray(o, minLen); }\n\nfunction _arrayLikeToArray(arr, len) { if (len == null || len > arr.length) len = arr.length; for (var i = 0, arr2 = new Array(len); i < len; i++) { arr2[i] = arr[i]; } return arr2; }\n\nfunction _iterableToArrayLimit(arr, i) { if (typeof Symbol === \"undefined\" || !(Symbol.iterator in Object(arr))) return; var _arr = []; var _n = true; var _d = false; var _e = undefined; try { for (var _i = arr[Symbol.iterator](), _s; !(_n = (_s = _i.next()).done); _n = true) { _arr.push(_s.value); if (i && _arr.length === i) break; } } catch (err) { _d = true; _e = err; } finally { try { if (!_n && _i[\"return\"] != null) _i[\"return\"](); } finally { if (_d) throw _e; } } return _arr; }\n\nfunction _arrayWithHoles(arr) { if (Array.isArray(arr)) return arr; }\n\nmodule.exports = function cssWithMappingToString(item) {\n  var _item = _slicedToArray(item, 4),\n      content = _item[1],\n      cssMapping = _item[3];\n\n  if (typeof btoa === 'function') {\n    // eslint-disable-next-line no-undef\n    var base64 = btoa(unescape(encodeURIComponent(JSON.stringify(cssMapping))));\n    var data = \"sourceMappingURL=data:application/json;charset=utf-8;base64,\".concat(base64);\n    var sourceMapping = \"/*# \".concat(data, \" */\");\n    var sourceURLs = cssMapping.sources.map(function (source) {\n      return \"/*# sourceURL=\".concat(cssMapping.sourceRoot || '').concat(source, \" */\");\n    });\n    return [content].concat(sourceURLs).concat([sourceMapping]).join('\\n');\n  }\n\n  return [content].join('\\n');\n};","\"use strict\";\n\n/*\n  MIT License http://www.opensource.org/licenses/mit-license.php\n  Author Tobias Koppers @sokra\n*/\n// css base code, injected by the css-loader\n// eslint-disable-next-line func-names\nmodule.exports = function (cssWithMappingToString) {\n  var list = []; // return the list of modules as css string\n\n  list.toString = function toString() {\n    return this.map(function (item) {\n      var content = cssWithMappingToString(item);\n\n      if (item[2]) {\n        return \"@media \".concat(item[2], \" {\").concat(content, \"}\");\n      }\n\n      return content;\n    }).join('');\n  }; // import a list of modules into the list\n  // eslint-disable-next-line func-names\n\n\n  list.i = function (modules, mediaQuery, dedupe) {\n    if (typeof modules === 'string') {\n      // eslint-disable-next-line no-param-reassign\n      modules = [[null, modules, '']];\n    }\n\n    var alreadyImportedModules = {};\n\n    if (dedupe) {\n      for (var i = 0; i < this.length; i++) {\n        // eslint-disable-next-line prefer-destructuring\n        var id = this[i][0];\n\n        if (id != null) {\n          alreadyImportedModules[id] = true;\n        }\n      }\n    }\n\n    for (var _i = 0; _i < modules.length; _i++) {\n      var item = [].concat(modules[_i]);\n\n      if (dedupe && alreadyImportedModules[item[0]]) {\n        // eslint-disable-next-line no-continue\n        continue;\n      }\n\n      if (mediaQuery) {\n        if (!item[2]) {\n          item[2] = mediaQuery;\n        } else {\n          item[2] = \"\".concat(mediaQuery, \" and \").concat(item[2]);\n        }\n      }\n\n      list.push(item);\n    }\n  };\n\n  return list;\n};","import freeGlobal from './_freeGlobal.js';\n\n/** Detect free variable `self`. */\nvar freeSelf = typeof self == 'object' && self && self.Object === Object && self;\n\n/** Used as a reference to the global object. */\nvar root = freeGlobal || freeSelf || Function('return this')();\n\nexport default root;\n","import root from './_root.js';\nimport stubFalse from './stubFalse.js';\n\n/** Detect free variable `exports`. */\nvar freeExports = typeof exports == 'object' && exports && !exports.nodeType && exports;\n\n/** Detect free variable `module`. */\nvar freeModule = freeExports && typeof module == 'object' && module && !module.nodeType && module;\n\n/** Detect the popular CommonJS extension `module.exports`. */\nvar moduleExports = freeModule && freeModule.exports === freeExports;\n\n/** Built-in value references. */\nvar Buffer = moduleExports ? root.Buffer : undefined;\n\n/* Built-in method references for those with the same name as other `lodash` methods. */\nvar nativeIsBuffer = Buffer ? Buffer.isBuffer : undefined;\n\n/**\n * Checks if `value` is a buffer.\n *\n * @static\n * @memberOf _\n * @since 4.3.0\n * @category Lang\n * @param {*} value The value to check.\n * @returns {boolean} Returns `true` if `value` is a buffer, else `false`.\n * @example\n *\n * _.isBuffer(new Buffer(2));\n * // => true\n *\n * _.isBuffer(new Uint8Array(2));\n * // => false\n */\nvar isBuffer = nativeIsBuffer || stubFalse;\n\nexport default isBuffer;\n","import freeGlobal from './_freeGlobal.js';\n\n/** Detect free variable `exports`. */\nvar freeExports = typeof exports == 'object' && exports && !exports.nodeType && exports;\n\n/** Detect free variable `module`. */\nvar freeModule = freeExports && typeof module == 'object' && module && !module.nodeType && module;\n\n/** Detect the popular CommonJS extension `module.exports`. */\nvar moduleExports = freeModule && freeModule.exports === freeExports;\n\n/** Detect free variable `process` from Node.js. */\nvar freeProcess = moduleExports && freeGlobal.process;\n\n/** Used to access faster Node.js helpers. */\nvar nodeUtil = (function() {\n  try {\n    // Use `util.types` for Node.js 10+.\n    var types = freeModule && freeModule.require && freeModule.require('util').types;\n\n    if (types) {\n      return types;\n    }\n\n    // Legacy `process.binding('util')` for Node.js < 10.\n    return freeProcess && freeProcess.binding && freeProcess.binding('util');\n  } catch (e) {}\n}());\n\nexport default nodeUtil;\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module utils/version\n */\n\n/* globals window, global */\n\nimport CKEditorError from './ckeditorerror';\n\nconst version = '24.0.0';\n\n/* istanbul ignore next */\nconst windowOrGlobal = typeof window === 'object' ? window : global;\n\n/* istanbul ignore next */\nif ( windowOrGlobal.CKEDITOR_VERSION ) {\n\t/**\n\t * This error is thrown when due to a mistake in how CKEditor 5 was installed or initialized, some\n\t * of its modules were duplicated (evaluated and executed twice). Module duplication leads to inevitable runtime\n\t * errors.\n\t *\n\t * There are many situations in which some modules can be loaded twice. In the worst case scenario,\n\t * you may need to check your project for each of these issues and fix them all.\n\t *\n\t * # Trying to add a plugin to an existing build\n\t *\n\t * If you import an existing CKEditor 5 build and a plugin like this:\n\t *\n\t *\t\timport ClassicEditor from '@ckeditor/ckeditor5-build-classic';\n\t *\t\timport Highlight from '@ckeditor/ckeditor5-highlight/src/highlight';\n\t *\n\t * Then your project loads some CKEditor 5 packages twice. How does it happen?\n\t *\n\t * The build package contains a file which is already compiled with webpack. This means\n\t * that it contains all the necessary code from e.g. `@ckeditor/ckeditor5-engine` and `@ckeditor/ckeditor5-utils`.\n\t *\n\t * However, the `Highlight` plugin imports some of the modules from these packages, too. If you ask webpack to\n\t * build such a project, you will end up with the modules being included (and run) twice &mdash; first, because they are\n\t * included inside the build package, and second, because they are required by the `Highlight` plugin.\n\t *\n\t * Therefore, **you must never add plugins to an existing build** unless your plugin has no dependencies.\n\t *\n\t * Adding plugins to a build is done by taking the source version of this build (so, before it was built with webpack)\n\t * and adding plugins there. In this situation, webpack will know that it only needs to load each plugin once.\n\t *\n\t * Read more in the {@glink builds/guides/integration/installing-plugins \"Installing plugins\"} guide.\n\t *\n\t * # Confused an editor build with an editor implementation\n\t *\n\t * This scenario is very similar to the previous one, but has a different origin.\n\t *\n\t * Let's assume that you wanted to use CKEditor 5 from source, as explained in the\n\t * {@glink builds/guides/integration/advanced-setup#scenario-2-building-from-source \"Building from source\"} section\n\t * or in the {@glink framework/guides/quick-start \"Quick start\"} guide of CKEditor 5 Framework.\n\t *\n\t * The correct way to do so is to import an editor and plugins and run them together like this:\n\t *\n\t *\t\timport ClassicEditor from '@ckeditor/ckeditor5-editor-classic/src/classiceditor';\n\t *\t\timport Essentials from '@ckeditor/ckeditor5-essentials/src/essentials';\n\t *\t\timport Paragraph from '@ckeditor/ckeditor5-paragraph/src/paragraph';\n\t *\t\timport Bold from '@ckeditor/ckeditor5-basic-styles/src/bold';\n\t *\t\timport Italic from '@ckeditor/ckeditor5-basic-styles/src/italic';\n\t *\n\t *\t\tClassicEditor\n\t *\t\t\t.create( document.querySelector( '#editor' ), {\n\t *\t\t\t\tplugins: [ Essentials, Paragraph, Bold, Italic ],\n\t *\t\t\t\ttoolbar: [ 'bold', 'italic' ]\n\t *\t\t\t} )\n\t *\t\t\t.then( editor => {\n\t *\t\t\t\tconsole.log( 'Editor was initialized', editor );\n\t *\t\t\t} )\n\t *\t\t\t.catch( error => {\n\t *\t\t\t\tconsole.error( error.stack );\n\t *\t\t\t} );\n\t *\n\t * However, you might have mistakenly imported a build instead of the source `ClassicEditor`. In this case\n\t * your imports will look like this:\n\t *\n\t *\t\timport ClassicEditor from '@ckeditor/ckeditor5-build-classic';\n\t *\t\timport Essentials from '@ckeditor/ckeditor5-essentials/src/essentials';\n\t *\t\timport Paragraph from '@ckeditor/ckeditor5-paragraph/src/paragraph';\n\t *\t\timport Bold from '@ckeditor/ckeditor5-basic-styles/src/bold';\n\t *\t\timport Italic from '@ckeditor/ckeditor5-basic-styles/src/italic';\n\t *\n\t * This creates the same situation as in the previous section because you use a build together with source plugins.\n\t *\n\t * Remember: `@ckeditor/ckeditor5-build-*` packages contain editor builds and `@ckeditor/ckeditor5-editor-*` contain source editors.\n\t *\n\t * # Loading two or more builds on one page\n\t *\n\t * If you use CKEditor 5 builds, you might have loaded two (or more) `ckeditor.js` files on one web page.\n\t * Check your web page for duplicated `<script>` elements or make sure your page builder/bundler includes CKEditor only once.\n\t *\n\t * If you want to use two different types of editors at once, see the\n\t * {@glink builds/guides/integration/advanced-setup#scenario-3-using-two-different-editors \"Using two different editors\"}\n\t * section.\n\t *\n\t * # Using outdated packages\n\t *\n\t * Building CKEditor 5 from source requires using multiple npm packages. These packages have their dependencies\n\t * to other packages. If you use the latest version of, for example, `@ckeditor/ckeditor5-editor-classic` with\n\t * an outdated version of `@ckeditor/ckeditor5-image`, npm or yarn will need to install two different versions of\n\t * `@ckeditor/ckeditor5-core` because `@ckeditor/ckeditor5-editor-classic` and `@ckeditor/ckeditor5-image` may require\n\t * different versions of the core package.\n\t *\n\t * The solution to this issue is to update all packages to their latest version. We recommend\n\t * using tools like [`npm-check-updates`](https://www.npmjs.com/package/npm-check-updates) which simplify this process.\n\t *\n\t * # Conflicting version of dependencies\n\t *\n\t * This is a special case of the previous scenario. If you use CKEditor 5 with some third-party plugins,\n\t * it may happen that even if you use the latest versions of the official packages and the latest version of\n\t * these third-party packages, there will be a conflict between some of their dependencies.\n\t *\n\t * Such a problem can be resolved by either downgrading CKEditor 5 packages (which we do not recommend) or\n\t * asking the author of the third-party package to upgrade its depdendencies (or forking their project and doing this yourself).\n\t *\n\t * **Note:** All official CKEditor 5 packages (excluding integrations and `ckeditor5-dev-*` packages) are released in the\n\t * same major version. This is &mdash; in the `x.y.z`, the `x` is the same for all packages. This is the simplest way to check\n\t * whether you use packages coming from the same CKEditor 5 version. You can read more about versioning in the\n\t * {@glink framework/guides/support/versioning-policy Versioning policy} guide.\n\t *\n\t * # Packages were duplicated in `node_modules`\n\t *\n\t * In some situations, especially when calling `npm install` multiple times, it may happen\n\t * that npm will not correctly \"deduplicate\" packages.\n\t *\n\t * Normally, npm deduplicates all packages so, for example, `@ckeditor/ckeditor5-core` is installed only once in `node_modules/`.\n\t * However, it is known to fail to do so from time to time.\n\t *\n\t * We recommend checking if any of the steps listed below help:\n\t *\n\t * * `rm -rf node_modules && npm install` to make sure you have a clean `node_modules/` directory. This step\n\t * is known to help in most cases.\n\t * * If you use `yarn.lock` or `package-lock.json`, remove it before `npm install`.\n\t * * Check whether all CKEditor 5 packages are up to date and reinstall them\n\t * if you changed anything (`rm -rf node_modules && npm install`).\n\t *\n\t * If all packages are correct and compatible with each other, the steps above are known to help. If not, you may\n\t * try to check with `npm ls` how many times packages like `@ckeditor/ckeditor5-core`, `@ckeditor/ckeditor5-engine` and\n\t *`@ckeditor/ckeditor5-utils` are installed. 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51%;\\n\\t--ck-color-focus-border: \\t\\t\\t\\t\\t\\t\\t\\t\\thsl(var(--ck-color-focus-border-coordinates));\\n\\t--ck-color-focus-outer-shadow:\\t\\t\\t\\t\\t\\t\\t\\thsl(207, 89%, 86%);\\n\\t--ck-color-focus-disabled-shadow:\\t\\t\\t\\t\\t\\t\\thsla(209, 90%, 72%,.3);\\n\\t--ck-color-focus-error-shadow:\\t\\t\\t\\t\\t\\t\\t\\thsla(9,100%,56%,.3);\\n\\t--ck-color-text: \\t\\t\\t\\t\\t\\t\\t\\t\\t\\t\\tvar(--ck-color-base-text);\\n\\t--ck-color-shadow-drop: \\t\\t\\t\\t\\t\\t\\t\\t\\thsla(0, 0%, 0%, 0.15);\\n\\t--ck-color-shadow-drop-active:\\t\\t\\t\\t\\t\\t\\t\\thsla(0, 0%, 0%, 0.2);\\n\\t--ck-color-shadow-inner: \\t\\t\\t\\t\\t\\t\\t\\t\\thsla(0, 0%, 0%, 0.1);\\n\\n\\t/* -- Buttons ------------------------------------------------------------------------------- */\\n\\n\\t--ck-color-button-default-background: \\t\\t\\t\\t\\t\\ttransparent;\\n\\t--ck-color-button-default-hover-background: \\t\\t\\t\\thsl(0, 0%, 90%);\\n\\t--ck-color-button-default-active-background: \\t\\t\\t\\thsl(0, 0%, 85%);\\n\\t--ck-color-button-default-active-shadow: \\t\\t\\t\\t\\thsl(0, 0%, 75%);\\n\\t--ck-color-button-default-disabled-background: \\t\\t\\t\\ttransparent;\\n\\n\\t--ck-color-button-on-background: \\t\\t\\t\\t\\t\\t\\thsl(0, 0%, 87%);\\n\\t--ck-color-button-on-hover-background: \\t\\t\\t\\t\\t\\thsl(0, 0%, 77%);\\n\\t--ck-color-button-on-active-background: \\t\\t\\t\\t\\thsl(0, 0%, 73%);\\n\\t--ck-color-button-on-active-shadow: \\t\\t\\t\\t\\t\\thsl(0, 0%, 63%);\\n\\t--ck-color-button-on-disabled-background: \\t\\t\\t\\t\\thsl(0, 0%, 87%);\\n\\n\\t--ck-color-button-action-background: \\t\\t\\t\\t\\t\\tvar(--ck-color-base-action);\\n\\t--ck-color-button-action-hover-background: \\t\\t\\t\\t\\thsl(104, 44%, 43%);\\n\\t--ck-color-button-action-active-background: \\t\\t\\t\\thsl(104, 44%, 41%);\\n\\t--ck-color-button-action-active-shadow: \\t\\t\\t\\t\\thsl(104, 44%, 36%);\\n\\t--ck-color-button-action-disabled-background: \\t\\t\\t\\thsl(104, 44%, 58%);\\n\\t--ck-color-button-action-text: \\t\\t\\t\\t\\t\\t\\t\\tvar(--ck-color-base-background);\\n\\n\\t--ck-color-button-save: \\t\\t\\t\\t\\t\\t\\t\\t\\thsl(120, 100%, 27%);\\n\\t--ck-color-button-cancel: \\t\\t\\t\\t\\t\\t\\t\\t\\thsl(15, 100%, 43%);\\n\\n\\t--ck-color-switch-button-off-background:\\t\\t\\t\\t\\thsl(0, 0%, 69%);\\n\\t--ck-color-switch-button-off-hover-background:\\t\\t\\t\\thsl(0, 0%, 64%);\\n\\t--ck-color-switch-button-on-background:\\t\\t\\t\\t\\t\\tvar(--ck-color-button-action-background);\\n\\t--ck-color-switch-button-on-hover-background:\\t\\t\\t\\thsl(104, 44%, 43%);\\n\\t--ck-color-switch-button-inner-background:\\t\\t\\t\\t\\tvar(--ck-color-base-background);\\n\\t--ck-color-switch-button-inner-shadow:\\t\\t\\t\\t\\t\\thsla(0, 0%, 0%, 0.1);\\n\\n\\t/* -- Dropdown ------------------------------------------------------------------------------ */\\n\\n\\t--ck-color-dropdown-panel-background: \\t\\t\\t\\t\\t\\tvar(--ck-color-base-background);\\n\\t--ck-color-dropdown-panel-border: \\t\\t\\t\\t\\t\\t\\tvar(--ck-color-base-border);\\n\\n\\t/* -- Input --------------------------------------------------------------------------------- */\\n\\n\\t--ck-color-input-background: \\t\\t\\t\\t\\t\\t\\t\\tvar(--ck-color-base-background);\\n\\t--ck-color-input-border: \\t\\t\\t\\t\\t\\t\\t\\t\\thsl(0, 0%, 78%);\\n\\t--ck-color-input-error-border:\\t\\t\\t\\t\\t\\t\\t\\tvar(--ck-color-base-error);\\n\\t--ck-color-input-text: \\t\\t\\t\\t\\t\\t\\t\\t\\t\\tvar(--ck-color-base-text);\\n\\t--ck-color-input-disabled-background: \\t\\t\\t\\t\\t\\thsl(0, 0%, 95%);\\n\\t--ck-color-input-disabled-border: \\t\\t\\t\\t\\t\\t\\thsl(0, 0%, 78%);\\n\\t--ck-color-input-disabled-text: \\t\\t\\t\\t\\t\\t\\thsl(0, 0%, 46%);\\n\\n\\t/* -- List ---------------------------------------------------------------------------------- */\\n\\n\\t--ck-color-list-background: \\t\\t\\t\\t\\t\\t\\t\\tvar(--ck-color-base-background);\\n\\t--ck-color-list-button-hover-background: \\t\\t\\t\\t\\tvar(--ck-color-button-default-hover-background);\\n\\t--ck-color-list-button-on-background: \\t\\t\\t\\t\\t\\tvar(--ck-color-base-active);\\n\\t--ck-color-list-button-on-background-focus: \\t\\t\\t\\tvar(--ck-color-base-active-focus);\\n\\t--ck-color-list-button-on-text:\\t\\t\\t\\t\\t\\t\\t\\tvar(--ck-color-base-background);\\n\\n\\t/* -- Panel --------------------------------------------------------------------------------- */\\n\\n\\t--ck-color-panel-background: \\t\\t\\t\\t\\t\\t\\t\\tvar(--ck-color-base-background);\\n\\t--ck-color-panel-border: \\t\\t\\t\\t\\t\\t\\t\\t\\tvar(--ck-color-base-border);\\n\\n\\t/* -- Toolbar ------------------------------------------------------------------------------- */\\n\\n\\t--ck-color-toolbar-background: \\t\\t\\t\\t\\t\\t\\t\\tvar(--ck-color-base-foreground);\\n\\t--ck-color-toolbar-border: \\t\\t\\t\\t\\t\\t\\t\\t\\tvar(--ck-color-base-border);\\n\\n\\t/* -- Tooltip ------------------------------------------------------------------------------- */\\n\\n\\t--ck-color-tooltip-background: \\t\\t\\t\\t\\t\\t\\t\\tvar(--ck-color-base-text);\\n\\t--ck-color-tooltip-text: \\t\\t\\t\\t\\t\\t\\t\\t\\tvar(--ck-color-base-background);\\n\\n\\t/* -- Engine -------------------------------------------------------------------------------- */\\n\\n\\t--ck-color-engine-placeholder-text: \\t\\t\\t\\t\\t\\thsl(0, 0%, 44%);\\n\\n\\t/* -- Upload -------------------------------------------------------------------------------- */\\n\\n\\t--ck-color-upload-bar-background:\\t\\t \\t\\t\\t\\t\\thsl(209, 92%, 70%);\\n\\n\\t/* -- Link -------------------------------------------------------------------------------- */\\n\\n\\t--ck-color-link-default:\\t\\t\\t\\t\\t\\t\\t\\t\\thsl(240, 100%, 47%);\\n\\t--ck-color-link-selected-background:\\t\\t\\t\\t\\t\\thsla(201, 100%, 56%, 0.1);\\n\\t--ck-color-link-fake-selection:\\t\\t\\t\\t\\t\\t\\t\\thsla(201, 100%, 56%, 0.3);\\n}\\n\",\"/*\\n * Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\\n */\\n\\n:root {\\n\\t/**\\n\\t * An opacity value of disabled UI item.\\n\\t */\\n\\t--ck-disabled-opacity: .5;\\n}\\n\",\"/*\\n * Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\\n */\\n\\n:root {\\n\\t/**\\n\\t * The geometry of the of focused element's outer shadow.\\n\\t */\\n\\t--ck-focus-outer-shadow-geometry: 0 0 0 3px;\\n\\n\\t/**\\n\\t * A visual style of focused element's outer shadow.\\n\\t */\\n\\t--ck-focus-outer-shadow: var(--ck-focus-outer-shadow-geometry) var(--ck-color-focus-outer-shadow);\\n\\n\\t/**\\n\\t * A visual style of focused element's outer shadow (when disabled).\\n\\t */\\n\\t--ck-focus-disabled-outer-shadow: var(--ck-focus-outer-shadow-geometry) var(--ck-color-focus-disabled-shadow);\\n\\n\\t/**\\n\\t * A visual style of focused element's outer shadow (when has errors).\\n\\t */\\n\\t--ck-focus-error-outer-shadow: var(--ck-focus-outer-shadow-geometry) var(--ck-color-focus-error-shadow);\\n\\n\\t/**\\n\\t * A visual style of focused element's border or outline.\\n\\t */\\n\\t--ck-focus-ring: 1px solid var(--ck-color-focus-border);\\n}\\n\",\"/*\\n * Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\\n */\\n\\n:root {\\n\\t--ck-font-size-base: 13px;\\n\\t--ck-line-height-base: 1.84615;\\n\\t--ck-font-face: Helvetica, Arial, Tahoma, Verdana, Sans-Serif;\\n\\n\\t--ck-font-size-tiny: 0.7em;\\n\\t--ck-font-size-small: 0.75em;\\n\\t--ck-font-size-normal: 1em;\\n\\t--ck-font-size-big: 1.4em;\\n\\t--ck-font-size-large: 1.8em;\\n}\\n\",\"/*\\n * Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\\n */\\n\\n:root {\\n\\t/* This is super-important. This is **manually** adjusted so a button without an icon\\n\\tis never smaller than a button with icon, additionally making sure that text-less buttons\\n\\tare perfect squares. The value is also shared by other components which should stay \\\"in-line\\\"\\n\\twith buttons. */\\n\\t--ck-ui-component-min-height: 2.3em;\\n}\\n\\n/**\\n * Resets an element, ignoring its children.\\n */\\n.ck.ck-reset,\\n.ck.ck-reset_all,\\n.ck.ck-reset_all * {\\n\\t/* Do not include inheritable rules here. */\\n\\tmargin: 0;\\n\\tpadding: 0;\\n\\tborder: 0;\\n\\tbackground: transparent;\\n\\ttext-decoration: none;\\n\\tvertical-align: middle;\\n\\ttransition: none;\\n\\n\\t/* https://github.com/ckeditor/ckeditor5-theme-lark/issues/105 */\\n\\tword-wrap: break-word;\\n}\\n\\n/**\\n * Resets an element AND its children.\\n */\\n.ck.ck-reset_all,\\n.ck.ck-reset_all * {\\n\\t/* These are rule inherited by all children elements. */\\n\\tborder-collapse: collapse;\\n\\tfont: normal normal normal var(--ck-font-size-base)/var(--ck-line-height-base) var(--ck-font-face);\\n\\tcolor: var(--ck-color-text);\\n\\ttext-align: left;\\n\\twhite-space: nowrap;\\n\\tcursor: auto;\\n\\tfloat: none;\\n}\\n\\n.ck.ck-reset_all {\\n\\t& .ck-rtl * {\\n\\t\\ttext-align: right;\\n\\t}\\n\\n\\t& iframe {\\n\\t\\t/* For IE */\\n\\t\\tvertical-align: inherit;\\n\\t}\\n\\n\\t& textarea {\\n\\t\\twhite-space: pre-wrap;\\n\\t}\\n\\n\\t& textarea,\\n\\t& input[type=\\\"text\\\"],\\n\\t& input[type=\\\"password\\\"] {\\n\\t\\tcursor: text;\\n\\t}\\n\\n\\t& textarea[disabled],\\n\\t& input[type=\\\"text\\\"][disabled],\\n\\t& input[type=\\\"password\\\"][disabled] {\\n\\t\\tcursor: default;\\n\\t}\\n\\n\\t& fieldset {\\n\\t\\tpadding: 10px;\\n\\t\\tborder: 2px groove hsl(255, 7%, 88%);\\n\\t}\\n\\n\\t& button::-moz-focus-inner {\\n\\t\\t/* See http://stackoverflow.com/questions/5517744/remove-extra-button-spacing-padding-in-firefox */\\n\\t\\tpadding: 0;\\n\\t\\tborder: 0\\n\\t}\\n}\\n\\n/**\\n * Default UI rules for RTL languages.\\n */\\n.ck[dir=\\\"rtl\\\"],\\n.ck[dir=\\\"rtl\\\"] .ck {\\n\\ttext-align: right;\\n}\\n\",\"/*\\n * Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\\n */\\n\\n/**\\n * Default border-radius value.\\n */\\n:root{\\n\\t--ck-border-radius: 2px;\\n}\\n\",\"/*\\n * Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\\n */\\n\\n:root {\\n\\t/**\\n\\t * A visual style of element's inner shadow (i.e. input).\\n\\t */\\n\\t--ck-inner-shadow: 2px 2px 3px var(--ck-color-shadow-inner) inset;\\n\\n\\t/**\\n\\t * A visual style of element's drop shadow (i.e. panel).\\n\\t */\\n\\t--ck-drop-shadow: 0 1px 2px 1px var(--ck-color-shadow-drop);\\n\\n\\t/**\\n\\t * A visual style of element's active shadow (i.e. comment or suggestion).\\n\\t */\\n\\t--ck-drop-shadow-active: 0 3px 6px 1px var(--ck-color-shadow-drop-active);\\n}\\n\",\"/*\\n * Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\\n */\\n\\n:root {\\n\\t--ck-spacing-unit: \\t\\t\\t\\t\\t\\t0.6em;\\n\\t--ck-spacing-large: \\t\\t\\t\\t\\tcalc(var(--ck-spacing-unit) * 1.5);\\n\\t--ck-spacing-standard: \\t\\t\\t\\t\\tvar(--ck-spacing-unit);\\n\\t--ck-spacing-medium: \\t\\t\\t\\t\\tcalc(var(--ck-spacing-unit) * 0.8);\\n\\t--ck-spacing-small: \\t\\t\\t\\t\\tcalc(var(--ck-spacing-unit) * 0.5);\\n\\t--ck-spacing-tiny: \\t\\t\\t\\t\\t\\tcalc(var(--ck-spacing-unit) * 0.3);\\n\\t--ck-spacing-extra-tiny: \\t\\t\\t\\tcalc(var(--ck-spacing-unit) * 0.16);\\n}\\n\"],\"sourceRoot\":\"\"}]);\n// Exports\nexport default ___CSS_LOADER_EXPORT___;\n","// Imports\nimport ___CSS_LOADER_API_SOURCEMAP_IMPORT___ from \"../../../../../css-loader/dist/runtime/cssWithMappingToString.js\";\nimport ___CSS_LOADER_API_IMPORT___ from \"../../../../../css-loader/dist/runtime/api.js\";\nvar ___CSS_LOADER_EXPORT___ = ___CSS_LOADER_API_IMPORT___(___CSS_LOADER_API_SOURCEMAP_IMPORT___);\n// Module\n___CSS_LOADER_EXPORT___.push([module.id, \":root{--ck-color-editable-blur-selection:#d9d9d9}.ck.ck-editor__editable:not(.ck-editor__nested-editable){border-radius:0}.ck-rounded-corners .ck.ck-editor__editable:not(.ck-editor__nested-editable),.ck.ck-editor__editable:not(.ck-editor__nested-editable).ck-rounded-corners{border-radius:var(--ck-border-radius)}.ck.ck-editor__editable:not(.ck-editor__nested-editable).ck-focused{outline:none;border:var(--ck-focus-ring);box-shadow:var(--ck-inner-shadow),0 0}.ck.ck-editor__editable_inline{overflow:auto;padding:0 var(--ck-spacing-standard);border:1px solid transparent}.ck.ck-editor__editable_inline[dir=ltr]{text-align:left}.ck.ck-editor__editable_inline[dir=rtl]{text-align:right}.ck.ck-editor__editable_inline>:first-child{margin-top:var(--ck-spacing-large)}.ck.ck-editor__editable_inline>:last-child{margin-bottom:var(--ck-spacing-large)}.ck.ck-editor__editable_inline.ck-blurred ::selection{background:var(--ck-color-editable-blur-selection)}.ck.ck-balloon-panel.ck-toolbar-container[class*=arrow_n]:after{border-bottom-color:var(--ck-color-base-foreground)}.ck.ck-balloon-panel.ck-toolbar-container[class*=arrow_s]:after{border-top-color:var(--ck-color-base-foreground)}\", \"\",{\"version\":3,\"sources\":[\"webpack://./node_modules/@ckeditor/ckeditor5-theme-lark/theme/ckeditor5-ui/components/editorui/editorui.css\",\"webpack://./node_modules/@ckeditor/ckeditor5-theme-lark/theme/mixins/_rounded.css\",\"webpack://./node_modules/@ckeditor/ckeditor5-theme-lark/theme/mixins/_focus.css\",\"webpack://./node_modules/@ckeditor/ckeditor5-theme-lark/theme/mixins/_shadow.css\"],\"names\":[],\"mappings\":\"AAWA,MACC,0CACD,CAEA,yDCJC,eDWD,CAPA,yJCAE,qCDOF,CAJC,oEERA,YAAa,CACb,2BAA2B,CCF3B,qCHYA,CAGD,+BACC,aAAc,CACd,oCAAqC,CACrC,4BAwBD,CAtBC,wCACC,eACD,CAEA,wCACC,gBACD,CAGA,4CACC,kCACD,CAGA,2CACC,qCACD,CAGA,sDACC,kDACD,CAKA,gEACC,mDACD,CAIA,gEACC,gDACD\",\"sourcesContent\":[\"/*\\n * Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\\n */\\n\\n@import \\\"../../../mixins/_rounded.css\\\";\\n@import \\\"../../../mixins/_disabled.css\\\";\\n@import \\\"../../../mixins/_shadow.css\\\";\\n@import \\\"../../../mixins/_focus.css\\\";\\n@import \\\"../../mixins/_button.css\\\";\\n\\n:root {\\n\\t--ck-color-editable-blur-selection: hsl(0, 0%, 85%);\\n}\\n\\n.ck.ck-editor__editable:not(.ck-editor__nested-editable) {\\n\\t@mixin ck-rounded-corners;\\n\\n\\t&.ck-focused {\\n\\t\\t@mixin ck-focus-ring;\\n\\t\\t@mixin ck-box-shadow var(--ck-inner-shadow);\\n\\t}\\n}\\n\\n.ck.ck-editor__editable_inline {\\n\\toverflow: auto;\\n\\tpadding: 0 var(--ck-spacing-standard);\\n\\tborder: 1px solid transparent;\\n\\n\\t&[dir=\\\"ltr\\\"] {\\n\\t\\ttext-align: left;\\n\\t}\\n\\n\\t&[dir=\\\"rtl\\\"] {\\n\\t\\ttext-align: right;\\n\\t}\\n\\n\\t/* https://github.com/ckeditor/ckeditor5-theme-lark/issues/116 */\\n\\t& > *:first-child {\\n\\t\\tmargin-top: var(--ck-spacing-large);\\n\\t}\\n\\n\\t/* https://github.com/ckeditor/ckeditor5/issues/847 */\\n\\t& > *:last-child {\\n\\t\\tmargin-bottom: var(--ck-spacing-large);\\n\\t}\\n\\n\\t/* https://github.com/ckeditor/ckeditor5/issues/6517 */\\n\\t&.ck-blurred ::selection {\\n\\t\\tbackground: var(--ck-color-editable-blur-selection);\\n\\t}\\n}\\n\\n/* https://github.com/ckeditor/ckeditor5-theme-lark/issues/111 */\\n.ck.ck-balloon-panel.ck-toolbar-container[class*=\\\"arrow_n\\\"] {\\n\\t&::after {\\n\\t\\tborder-bottom-color: var(--ck-color-base-foreground);\\n\\t}\\n}\\n\\n.ck.ck-balloon-panel.ck-toolbar-container[class*=\\\"arrow_s\\\"] {\\n\\t&::after {\\n\\t\\tborder-top-color: var(--ck-color-base-foreground);\\n\\t}\\n}\\n\",\"/*\\n * Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\\n */\\n\\n/**\\n * Implements rounded corner interface for .ck-rounded-corners class.\\n *\\n * @see $ck-border-radius\\n */\\n@define-mixin ck-rounded-corners {\\n\\tborder-radius: 0;\\n\\n\\t@nest .ck-rounded-corners &,\\n\\t&.ck-rounded-corners {\\n\\t\\tborder-radius: var(--ck-border-radius);\\n\\t\\t@mixin-content;\\n\\t}\\n}\\n\",\"/*\\n * Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\\n */\\n\\n/**\\n * A visual style of focused element's border.\\n */\\n@define-mixin ck-focus-ring {\\n\\t/* Disable native outline. */\\n\\toutline: none;\\n\\tborder: var(--ck-focus-ring)\\n}\\n\",\"/*\\n * Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\\n */\\n\\n/**\\n * A helper to combine multiple shadows.\\n */\\n@define-mixin ck-box-shadow $shadowA, $shadowB: 0 0 {\\n\\tbox-shadow: $shadowA, $shadowB;\\n}\\n\\n/**\\n * Gives an element a drop shadow so it looks like a floating panel.\\n */\\n@define-mixin ck-drop-shadow {\\n\\t@mixin ck-box-shadow var(--ck-drop-shadow);\\n}\\n\"],\"sourceRoot\":\"\"}]);\n// Exports\nexport default ___CSS_LOADER_EXPORT___;\n","// Imports\nimport ___CSS_LOADER_API_SOURCEMAP_IMPORT___ from \"../../../../../css-loader/dist/runtime/cssWithMappingToString.js\";\nimport ___CSS_LOADER_API_IMPORT___ from \"../../../../../css-loader/dist/runtime/api.js\";\nvar ___CSS_LOADER_EXPORT___ = ___CSS_LOADER_API_IMPORT___(___CSS_LOADER_API_SOURCEMAP_IMPORT___);\n// Module\n___CSS_LOADER_EXPORT___.push([module.id, \".ck.ck-label{display:block}.ck.ck-voice-label{display:none}.ck.ck-label{font-weight:700}\", \"\",{\"version\":3,\"sources\":[\"webpack://./node_modules/@ckeditor/ckeditor5-ui/theme/components/label/label.css\",\"webpack://./node_modules/@ckeditor/ckeditor5-theme-lark/theme/ckeditor5-ui/components/label/label.css\"],\"names\":[],\"mappings\":\"AAKA,aACC,aACD,CAEA,mBACC,YACD,CCNA,aACC,eACD\",\"sourcesContent\":[\"/*\\n * Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\\n */\\n\\n.ck.ck-label {\\n\\tdisplay: block;\\n}\\n\\n.ck.ck-voice-label {\\n\\tdisplay: none;\\n}\\n\",\"/*\\n * Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\\n */\\n\\n.ck.ck-label {\\n\\tfont-weight: bold;\\n}\\n\"],\"sourceRoot\":\"\"}]);\n// Exports\nexport default ___CSS_LOADER_EXPORT___;\n","// Imports\nimport ___CSS_LOADER_API_SOURCEMAP_IMPORT___ from \"../../../../../css-loader/dist/runtime/cssWithMappingToString.js\";\nimport ___CSS_LOADER_API_IMPORT___ from \"../../../../../css-loader/dist/runtime/api.js\";\nvar ___CSS_LOADER_EXPORT___ = ___CSS_LOADER_API_IMPORT___(___CSS_LOADER_API_SOURCEMAP_IMPORT___);\n// Module\n___CSS_LOADER_EXPORT___.push([module.id, \".ck.ck-sticky-panel .ck-sticky-panel__content_sticky{z-index:var(--ck-z-modal);position:fixed;top:0}.ck.ck-sticky-panel .ck-sticky-panel__content_sticky_bottom-limit{top:auto;position:absolute}.ck.ck-sticky-panel .ck-sticky-panel__content_sticky{box-shadow:var(--ck-drop-shadow),0 0;border-width:0 1px 1px;border-top-left-radius:0;border-top-right-radius:0}\", \"\",{\"version\":3,\"sources\":[\"webpack://./node_modules/@ckeditor/ckeditor5-ui/theme/components/panel/stickypanel.css\",\"webpack://./node_modules/@ckeditor/ckeditor5-theme-lark/theme/ckeditor5-ui/components/panel/stickypanel.css\",\"webpack://./node_modules/@ckeditor/ckeditor5-theme-lark/theme/mixins/_shadow.css\"],\"names\":[],\"mappings\":\"AAMC,qDACC,yBAA0B,CAC1B,cAAe,CACf,KACD,CAEA,kEACC,QAAS,CACT,iBACD,CCPA,qDCCA,oCAA8B,CDE7B,sBAAuB,CACvB,wBAAyB,CACzB,yBACD\",\"sourcesContent\":[\"/*\\n * Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\\n */\\n\\n.ck.ck-sticky-panel {\\n\\t& .ck-sticky-panel__content_sticky {\\n\\t\\tz-index: var(--ck-z-modal); /* #315 */\\n\\t\\tposition: fixed;\\n\\t\\ttop: 0;\\n\\t}\\n\\n\\t& .ck-sticky-panel__content_sticky_bottom-limit {\\n\\t\\ttop: auto;\\n\\t\\tposition: absolute;\\n\\t}\\n}\\n\",\"/*\\n * Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\\n */\\n\\n@import \\\"../../../mixins/_shadow.css\\\";\\n\\n.ck.ck-sticky-panel {\\n\\t& .ck-sticky-panel__content_sticky {\\n\\t\\t@mixin ck-drop-shadow;\\n\\n\\t\\tborder-width: 0 1px 1px;\\n\\t\\tborder-top-left-radius: 0;\\n\\t\\tborder-top-right-radius: 0;\\n\\t}\\n}\\n\",\"/*\\n * Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\\n */\\n\\n/**\\n * A helper to combine multiple shadows.\\n */\\n@define-mixin ck-box-shadow $shadowA, $shadowB: 0 0 {\\n\\tbox-shadow: $shadowA, $shadowB;\\n}\\n\\n/**\\n * Gives an element a drop shadow so it looks like a floating panel.\\n */\\n@define-mixin ck-drop-shadow {\\n\\t@mixin ck-box-shadow var(--ck-drop-shadow);\\n}\\n\"],\"sourceRoot\":\"\"}]);\n// Exports\nexport default ___CSS_LOADER_EXPORT___;\n","// Imports\nimport ___CSS_LOADER_API_SOURCEMAP_IMPORT___ from \"../../../../../css-loader/dist/runtime/cssWithMappingToString.js\";\nimport ___CSS_LOADER_API_IMPORT___ from \"../../../../../css-loader/dist/runtime/api.js\";\nvar ___CSS_LOADER_EXPORT___ = ___CSS_LOADER_API_IMPORT___(___CSS_LOADER_API_SOURCEMAP_IMPORT___);\n// Module\n___CSS_LOADER_EXPORT___.push([module.id, \".ck.ck-dropdown{display:inline-block;position:relative}.ck.ck-dropdown 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1)}:root{--ck-dropdown-arrow-size:calc(var(--ck-icon-size)*0.5)}.ck.ck-dropdown{font-size:inherit}.ck.ck-dropdown .ck-dropdown__arrow{width:var(--ck-dropdown-arrow-size)}[dir=ltr] .ck.ck-dropdown .ck-dropdown__arrow{right:var(--ck-spacing-standard);margin-left:var(--ck-spacing-standard)}[dir=rtl] .ck.ck-dropdown .ck-dropdown__arrow{left:var(--ck-spacing-standard);margin-right:var(--ck-spacing-small)}.ck.ck-dropdown.ck-disabled .ck-dropdown__arrow{opacity:var(--ck-disabled-opacity)}[dir=ltr] .ck.ck-dropdown .ck-button.ck-dropdown__button:not(.ck-button_with-text){padding-left:var(--ck-spacing-small)}[dir=rtl] .ck.ck-dropdown .ck-button.ck-dropdown__button:not(.ck-button_with-text){padding-right:var(--ck-spacing-small)}.ck.ck-dropdown .ck-button.ck-dropdown__button .ck-button__label{width:7em;overflow:hidden;text-overflow:ellipsis}.ck.ck-dropdown .ck-button.ck-dropdown__button.ck-disabled .ck-button__label{opacity:var(--ck-disabled-opacity)}.ck.ck-dropdown .ck-button.ck-dropdown__button.ck-on{border-bottom-left-radius:0;border-bottom-right-radius:0}.ck.ck-dropdown .ck-button.ck-dropdown__button.ck-dropdown__button_label-width_auto .ck-button__label{width:auto}.ck.ck-dropdown__panel{border-radius:0}.ck-rounded-corners .ck.ck-dropdown__panel,.ck.ck-dropdown__panel.ck-rounded-corners{border-radius:var(--ck-border-radius)}.ck.ck-dropdown__panel{box-shadow:var(--ck-drop-shadow),0 0;background:var(--ck-color-dropdown-panel-background);border:1px solid var(--ck-color-dropdown-panel-border);bottom:0;min-width:100%}.ck.ck-dropdown__panel.ck-dropdown__panel_se{border-top-left-radius:0}.ck.ck-dropdown__panel.ck-dropdown__panel_sw{border-top-right-radius:0}.ck.ck-dropdown__panel.ck-dropdown__panel_ne{border-bottom-left-radius:0}.ck.ck-dropdown__panel.ck-dropdown__panel_nw{border-bottom-right-radius:0}\", \"\",{\"version\":3,\"sources\":[\"webpack://./node_modules/@ckeditor/ckeditor5-ui/theme/components/dropdown/dropdown.css\",\"webpack://./node_modules/@ckeditor/ckeditor5-ui/theme/components/tooltip/mixins/_tooltip.css\",\"webpack://./node_modules/@ckeditor/ckeditor5-theme-lark/theme/ckeditor5-ui/components/dropdown/dropdown.css\",\"webpack://./node_modules/@ckeditor/ckeditor5-theme-lark/theme/mixins/_disabled.css\",\"webpack://./node_modules/@ckeditor/ckeditor5-theme-lark/theme/mixins/_rounded.css\",\"webpack://./node_modules/@ckeditor/ckeditor5-theme-lark/theme/mixins/_shadow.css\"],\"names\":[],\"mappings\":\"AAOA,gBACC,oBAAqB,CACrB,iBAyDD,CAvDC,oCACC,mBAAoB,CACpB,2BACD,CAGA,+CACC,UAOD,CCcA,iEACC,YACD,CDdA,oCAGC,kCAAmC,CAEnC,YAAa,CACb,yBAA0B,CAE1B,iBA8BD,CA5BC,+DACC,oBACD,CAEA,oHAEC,WACD,CAEA,oHAMC,QAAS,CACT,WACD,CAEA,oHAEC,MACD,CAEA,oHAEC,OACD,CAQF,mCACC,mCACD,CEhEA,MACC,sDACD,CAEA,gBAEC,iBAiED,CA/DC,oCACC,mCACD,CAGC,8CACC,gCAAiC,CAGjC,sCACD,CAIA,8CACC,+BAAgC,CAGhC,oCACD,CAGD,gDC/BA,kCDiCA,CAIE,mFAEC,oCACD,CAIA,mFAEC,qCACD,CAID,iEACC,SAAU,CACV,eAAgB,CAChB,sBACD,CAGA,6EC1DD,kCD4DC,CAGA,qDACC,2BAA4B,CAC5B,4BACD,CAEA,sGACC,UACD,CAIF,uBExEC,eFoGD,CA5BA,qFEpEE,qCFgGF,CA5BA,uBG1EC,oCAA8B,CH8E9B,oDAAqD,CACrD,sDAAuD,CACvD,QAAS,CAGT,cAmBD,CAfC,6CACC,wBACD,CAEA,6CACC,yBACD,CAEA,6CACC,2BACD,CAEA,6CACC,4BACD\",\"sourcesContent\":[\"/*\\n * Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\\n */\\n\\n@import \\\"../tooltip/mixins/_tooltip.css\\\";\\n\\n.ck.ck-dropdown {\\n\\tdisplay: inline-block;\\n\\tposition: relative;\\n\\n\\t& .ck-dropdown__arrow {\\n\\t\\tpointer-events: none;\\n\\t\\tz-index: var(--ck-z-default);\\n\\t}\\n\\n\\t/* Dropdown button should span horizontally, e.g. in vertical toolbars */\\n\\t& .ck-button.ck-dropdown__button {\\n\\t\\twidth: 100%;\\n\\n\\t\\t/* Disable main button's tooltip when the dropdown is open. Otherwise the panel may\\n\\t\\tpartially cover the tooltip */\\n\\t\\t&.ck-on {\\n\\t\\t\\t@mixin ck-tooltip_disabled;\\n\\t\\t}\\n\\t}\\n\\n\\t& .ck-dropdown__panel {\\n\\t\\t/* This is to get rid of flickering when the tooltip is shown under the panel,\\n\\t\\twhich looks like the panel moves vertically a pixel down and up. */\\n\\t\\t-webkit-backface-visibility: hidden;\\n\\n\\t\\tdisplay: none;\\n\\t\\tz-index: var(--ck-z-modal);\\n\\n\\t\\tposition: absolute;\\n\\n\\t\\t&.ck-dropdown__panel-visible {\\n\\t\\t\\tdisplay: inline-block;\\n\\t\\t}\\n\\n\\t\\t&.ck-dropdown__panel_ne,\\n\\t\\t&.ck-dropdown__panel_nw {\\n\\t\\t\\tbottom: 100%;\\n\\t\\t}\\n\\n\\t\\t&.ck-dropdown__panel_se,\\n\\t\\t&.ck-dropdown__panel_sw {\\n\\t\\t\\t/*\\n\\t\\t\\t * Using transform: translate3d( 0, 100%, 0 ) causes blurry dropdown on Chrome 67-78+ on non-retina displays.\\n\\t\\t\\t * See https://github.com/ckeditor/ckeditor5/issues/1053.\\n\\t\\t\\t */\\n\\t\\t\\ttop: 100%;\\n\\t\\t\\tbottom: auto;\\n\\t\\t}\\n\\n\\t\\t&.ck-dropdown__panel_ne,\\n\\t\\t&.ck-dropdown__panel_se {\\n\\t\\t\\tleft: 0px;\\n\\t\\t}\\n\\n\\t\\t&.ck-dropdown__panel_nw,\\n\\t\\t&.ck-dropdown__panel_sw {\\n\\t\\t\\tright: 0px;\\n\\t\\t}\\n\\t}\\n}\\n\\n/*\\n * Toolbar dropdown panels should be always above the UI (eg. other dropdown panels) from the editor's content.\\n * See https://github.com/ckeditor/ckeditor5/issues/7874\\n */\\n.ck.ck-toolbar .ck-dropdown__panel {\\n\\tz-index: calc( var(--ck-z-modal) + 1 );\\n}\\n\",\"/*\\n * Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\\n */\\n\\n/**\\n * Enables the tooltip, which is the tooltip is in DOM but\\n * not yet displayed.\\n */\\n@define-mixin ck-tooltip_enabled {\\n\\t& .ck-tooltip {\\n\\t\\tdisplay: block;\\n\\n\\t\\t/*\\n\\t\\t * Don't display tooltips in devices which don't support :hover.\\n\\t\\t * In fact, it's all about iOS, which forces user to click UI elements twice to execute\\n\\t\\t * the primary action, when tooltips are enabled.\\n\\t\\t *\\n\\t\\t * Q: OK, but why not the following query?\\n\\t\\t *\\n\\t\\t *   @media (hover) {\\n\\t\\t *       display: block;\\n\\t\\t *   }\\n\\t\\t *\\n\\t\\t * A: Because FF does not support it and it would completely disable tooltips\\n\\t\\t * in that browser.\\n\\t\\t *\\n\\t\\t * More in https://github.com/ckeditor/ckeditor5/issues/920.\\n\\t\\t */\\n\\t\\t@media (hover:none) {\\n\\t\\t\\tdisplay: none;\\n\\t\\t}\\n\\t}\\n}\\n\\n/**\\n * Disables the tooltip making it disappear from DOM.\\n */\\n@define-mixin ck-tooltip_disabled {\\n\\t& .ck-tooltip {\\n\\t\\tdisplay: none;\\n\\t}\\n}\\n\\n/**\\n * Shows the tooltip, which is already in DOM.\\n * Requires `ck-tooltip_enabled` first.\\n */\\n@define-mixin ck-tooltip_visible {\\n\\t& .ck-tooltip {\\n\\t\\tvisibility: visible;\\n\\t\\topacity: 1;\\n\\t}\\n}\\n\",\"/*\\n * Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\\n */\\n\\n@import \\\"../../../mixins/_rounded.css\\\";\\n@import \\\"../../../mixins/_disabled.css\\\";\\n@import \\\"../../../mixins/_shadow.css\\\";\\n@import \\\"@ckeditor/ckeditor5-ui/theme/mixins/_dir.css\\\";\\n\\n:root {\\n\\t--ck-dropdown-arrow-size: calc(0.5 * var(--ck-icon-size));\\n}\\n\\n.ck.ck-dropdown {\\n\\t/* Enable font size inheritance, which allows fluid UI scaling. */\\n\\tfont-size: inherit;\\n\\n\\t& .ck-dropdown__arrow {\\n\\t\\twidth: var(--ck-dropdown-arrow-size);\\n\\t}\\n\\n\\t@mixin ck-dir ltr {\\n\\t\\t& .ck-dropdown__arrow {\\n\\t\\t\\tright: var(--ck-spacing-standard);\\n\\n\\t\\t\\t/* A space to accommodate the triangle. */\\n\\t\\t\\tmargin-left: var(--ck-spacing-standard);\\n\\t\\t}\\n\\t}\\n\\n\\t@mixin ck-dir rtl {\\n\\t\\t& .ck-dropdown__arrow {\\n\\t\\t\\tleft: var(--ck-spacing-standard);\\n\\n\\t\\t\\t/* A space to accommodate the triangle. */\\n\\t\\t\\tmargin-right: var(--ck-spacing-small);\\n\\t\\t}\\n\\t}\\n\\n\\t&.ck-disabled .ck-dropdown__arrow {\\n\\t\\t@mixin ck-disabled;\\n\\t}\\n\\n\\t& .ck-button.ck-dropdown__button {\\n\\t\\t@mixin ck-dir ltr {\\n\\t\\t\\t&:not(.ck-button_with-text) {\\n\\t\\t\\t\\t/* Make sure dropdowns with just an icon have the right inner spacing */\\n\\t\\t\\t\\tpadding-left: var(--ck-spacing-small);\\n\\t\\t\\t}\\n\\t\\t}\\n\\n\\t\\t@mixin ck-dir rtl {\\n\\t\\t\\t&:not(.ck-button_with-text) {\\n\\t\\t\\t\\t/* Make sure dropdowns with just an icon have the right inner spacing */\\n\\t\\t\\t\\tpadding-right: var(--ck-spacing-small);\\n\\t\\t\\t}\\n\\t\\t}\\n\\n\\t\\t/* #23 */\\n\\t\\t& .ck-button__label {\\n\\t\\t\\twidth: 7em;\\n\\t\\t\\toverflow: hidden;\\n\\t\\t\\ttext-overflow: ellipsis;\\n\\t\\t}\\n\\n\\t\\t/* https://github.com/ckeditor/ckeditor5-theme-lark/issues/70 */\\n\\t\\t&.ck-disabled .ck-button__label {\\n\\t\\t\\t@mixin ck-disabled;\\n\\t\\t}\\n\\n\\t\\t/* https://github.com/ckeditor/ckeditor5/issues/816 */\\n\\t\\t&.ck-on {\\n\\t\\t\\tborder-bottom-left-radius: 0;\\n\\t\\t\\tborder-bottom-right-radius: 0;\\n\\t\\t}\\n\\n\\t\\t&.ck-dropdown__button_label-width_auto .ck-button__label {\\n\\t\\t\\twidth: auto;\\n\\t\\t}\\n\\t}\\n}\\n\\n.ck.ck-dropdown__panel {\\n\\t@mixin ck-rounded-corners;\\n\\t@mixin ck-drop-shadow;\\n\\n\\tbackground: var(--ck-color-dropdown-panel-background);\\n\\tborder: 1px solid var(--ck-color-dropdown-panel-border);\\n\\tbottom: 0;\\n\\n\\t/* Make sure the panel is at least as wide as the drop-down's button. */\\n\\tmin-width: 100%;\\n\\n\\t/* Disabled corner border radius to be consistent with the .dropdown__button\\n\\thttps://github.com/ckeditor/ckeditor5/issues/816 */\\n\\t&.ck-dropdown__panel_se {\\n\\t\\tborder-top-left-radius: 0;\\n\\t}\\n\\n\\t&.ck-dropdown__panel_sw {\\n\\t\\tborder-top-right-radius: 0;\\n\\t}\\n\\n\\t&.ck-dropdown__panel_ne {\\n\\t\\tborder-bottom-left-radius: 0;\\n\\t}\\n\\n\\t&.ck-dropdown__panel_nw {\\n\\t\\tborder-bottom-right-radius: 0;\\n\\t}\\n}\\n\",\"/*\\n * Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\\n */\\n\\n/**\\n * A class which indicates that an element holding it is disabled.\\n */\\n@define-mixin ck-disabled {\\n\\topacity: var(--ck-disabled-opacity);\\n}\\n\",\"/*\\n * Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\\n */\\n\\n/**\\n * Implements rounded corner interface for .ck-rounded-corners class.\\n *\\n * @see $ck-border-radius\\n */\\n@define-mixin ck-rounded-corners {\\n\\tborder-radius: 0;\\n\\n\\t@nest .ck-rounded-corners &,\\n\\t&.ck-rounded-corners {\\n\\t\\tborder-radius: var(--ck-border-radius);\\n\\t\\t@mixin-content;\\n\\t}\\n}\\n\",\"/*\\n * Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\\n */\\n\\n/**\\n * A helper to combine multiple shadows.\\n */\\n@define-mixin ck-box-shadow $shadowA, $shadowB: 0 0 {\\n\\tbox-shadow: $shadowA, $shadowB;\\n}\\n\\n/**\\n * Gives an element a drop shadow so it looks like a floating panel.\\n */\\n@define-mixin ck-drop-shadow {\\n\\t@mixin ck-box-shadow var(--ck-drop-shadow);\\n}\\n\"],\"sourceRoot\":\"\"}]);\n// Exports\nexport default ___CSS_LOADER_EXPORT___;\n","// Imports\nimport ___CSS_LOADER_API_SOURCEMAP_IMPORT___ from \"../../../../../css-loader/dist/runtime/cssWithMappingToString.js\";\nimport ___CSS_LOADER_API_IMPORT___ from \"../../../../../css-loader/dist/runtime/api.js\";\nvar ___CSS_LOADER_EXPORT___ = ___CSS_LOADER_API_IMPORT___(___CSS_LOADER_API_SOURCEMAP_IMPORT___);\n// Module\n___CSS_LOADER_EXPORT___.push([module.id, \".ck.ck-icon{vertical-align:middle}:root{--ck-icon-size:calc(var(--ck-line-height-base)*var(--ck-font-size-normal))}.ck.ck-icon{width:var(--ck-icon-size);height:var(--ck-icon-size);font-size:.8333350694em;will-change:transform}.ck.ck-icon,.ck.ck-icon *{color:inherit;cursor:inherit}.ck.ck-icon :not([fill]){fill:currentColor}\", \"\",{\"version\":3,\"sources\":[\"webpack://./node_modules/@ckeditor/ckeditor5-ui/theme/components/icon/icon.css\",\"webpack://./node_modules/@ckeditor/ckeditor5-theme-lark/theme/ckeditor5-ui/components/icon/icon.css\"],\"names\":[],\"mappings\":\"AAKA,YACC,qBACD,CCFA,MACC,0EACD,CAEA,YACC,yBAA0B,CAC1B,0BAA2B,CAG3B,uBAAwB,CAQxB,qBAcD,CAZC,0BARA,aAAc,CAGd,cAgBA,CAJC,yBAEC,iBACD\",\"sourcesContent\":[\"/*\\n * Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\\n */\\n\\n.ck.ck-icon {\\n\\tvertical-align: middle;\\n}\\n\",\"/*\\n * Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\\n */\\n\\n:root {\\n\\t--ck-icon-size: calc(var(--ck-line-height-base) * var(--ck-font-size-normal));\\n}\\n\\n.ck.ck-icon {\\n\\twidth: var(--ck-icon-size);\\n\\theight: var(--ck-icon-size);\\n\\n\\t/* Multiplied by the height of the line in \\\"px\\\" should give SVG \\\"viewport\\\" dimensions */\\n\\tfont-size: .8333350694em;\\n\\n\\tcolor: inherit;\\n\\n\\t/* Inherit cursor style (#5). */\\n\\tcursor: inherit;\\n\\n\\t/* This will prevent blurry icons on Firefox. See #340. */\\n\\twill-change: transform;\\n\\n\\t& * {\\n\\t\\t/* Inherit cursor style (#5). */\\n\\t\\tcursor: inherit;\\n\\n\\t\\t/* Allows dynamic coloring of the icons. */\\n\\t\\tcolor: inherit;\\n\\n\\t\\t&:not([fill]) {\\n\\t\\t\\t/* Needed by FF. */\\n\\t\\t\\tfill: currentColor;\\n\\t\\t}\\n\\t}\\n}\\n\"],\"sourceRoot\":\"\"}]);\n// Exports\nexport default ___CSS_LOADER_EXPORT___;\n","// Imports\nimport ___CSS_LOADER_API_SOURCEMAP_IMPORT___ from \"../../../../../css-loader/dist/runtime/cssWithMappingToString.js\";\nimport ___CSS_LOADER_API_IMPORT___ from \"../../../../../css-loader/dist/runtime/api.js\";\nvar ___CSS_LOADER_EXPORT___ = ___CSS_LOADER_API_IMPORT___(___CSS_LOADER_API_SOURCEMAP_IMPORT___);\n// Module\n___CSS_LOADER_EXPORT___.push([module.id, \".ck.ck-tooltip,.ck.ck-tooltip .ck-tooltip__text:after{position:absolute;pointer-events:none;-webkit-backface-visibility:hidden}.ck.ck-tooltip{visibility:hidden;opacity:0;display:none;z-index:var(--ck-z-modal)}.ck.ck-tooltip .ck-tooltip__text{display:inline-block}.ck.ck-tooltip .ck-tooltip__text:after{content:\\\"\\\";width:0;height:0}:root{--ck-tooltip-arrow-size:5px}.ck.ck-tooltip{left:50%;top:0;transition:opacity .2s ease-in-out .2s}.ck.ck-tooltip .ck-tooltip__text{border-radius:0}.ck-rounded-corners .ck.ck-tooltip .ck-tooltip__text,.ck.ck-tooltip .ck-tooltip__text.ck-rounded-corners{border-radius:var(--ck-border-radius)}.ck.ck-tooltip .ck-tooltip__text{font-size:.9em;line-height:1.5;color:var(--ck-color-tooltip-text);padding:var(--ck-spacing-small) var(--ck-spacing-medium);background:var(--ck-color-tooltip-background);position:relative;left:-50%}.ck.ck-tooltip .ck-tooltip__text:after{transition:opacity .2s ease-in-out .2s;border-style:solid;left:50%}.ck.ck-tooltip.ck-tooltip_s,.ck.ck-tooltip.ck-tooltip_se,.ck.ck-tooltip.ck-tooltip_sw{bottom:calc(var(--ck-tooltip-arrow-size)*-1);transform:translateY(100%)}.ck.ck-tooltip.ck-tooltip_s .ck-tooltip__text:after,.ck.ck-tooltip.ck-tooltip_se .ck-tooltip__text:after,.ck.ck-tooltip.ck-tooltip_sw .ck-tooltip__text:after{top:calc(var(--ck-tooltip-arrow-size)*-1 + 1px);transform:translateX(-50%);border-left-color:transparent;border-bottom-color:var(--ck-color-tooltip-background);border-right-color:transparent;border-top-color:transparent;border-left-width:var(--ck-tooltip-arrow-size);border-bottom-width:var(--ck-tooltip-arrow-size);border-right-width:var(--ck-tooltip-arrow-size);border-top-width:0}.ck.ck-tooltip.ck-tooltip_sw{right:50%;left:auto}.ck.ck-tooltip.ck-tooltip_sw .ck-tooltip__text{left:auto;right:calc(var(--ck-tooltip-arrow-size)*-2)}.ck.ck-tooltip.ck-tooltip_sw .ck-tooltip__text:after{left:auto;right:0}.ck.ck-tooltip.ck-tooltip_se{left:50%;right:auto}.ck.ck-tooltip.ck-tooltip_se .ck-tooltip__text{right:auto;left:calc(var(--ck-tooltip-arrow-size)*-2)}.ck.ck-tooltip.ck-tooltip_se .ck-tooltip__text:after{right:auto;left:0;transform:translateX(50%)}.ck.ck-tooltip.ck-tooltip_n{top:calc(var(--ck-tooltip-arrow-size)*-1);transform:translateY(-100%)}.ck.ck-tooltip.ck-tooltip_n .ck-tooltip__text:after{bottom:calc(var(--ck-tooltip-arrow-size)*-1);transform:translateX(-50%);border-left-color:transparent;border-bottom-color:transparent;border-right-color:transparent;border-top-color:var(--ck-color-tooltip-background);border-left-width:var(--ck-tooltip-arrow-size);border-bottom-width:0;border-right-width:var(--ck-tooltip-arrow-size);border-top-width:var(--ck-tooltip-arrow-size)}.ck.ck-tooltip.ck-tooltip_e{left:calc(100% + var(--ck-tooltip-arrow-size));top:50%}.ck.ck-tooltip.ck-tooltip_e .ck-tooltip__text{left:0;transform:translateY(-50%)}.ck.ck-tooltip.ck-tooltip_e .ck-tooltip__text:after{left:calc(var(--ck-tooltip-arrow-size)*-1);top:calc(50% - var(--ck-tooltip-arrow-size)*1);border-left-color:transparent;border-bottom-color:transparent;border-right-color:var(--ck-color-tooltip-background);border-top-color:transparent;border-left-width:0;border-bottom-width:var(--ck-tooltip-arrow-size);border-right-width:var(--ck-tooltip-arrow-size);border-top-width:var(--ck-tooltip-arrow-size)}.ck.ck-tooltip.ck-tooltip_w{right:calc(100% + var(--ck-tooltip-arrow-size));left:auto;top:50%}.ck.ck-tooltip.ck-tooltip_w .ck-tooltip__text{left:0;transform:translateY(-50%)}.ck.ck-tooltip.ck-tooltip_w .ck-tooltip__text:after{left:100%;top:calc(50% - var(--ck-tooltip-arrow-size)*1);border-left-color:var(--ck-color-tooltip-background);border-bottom-color:transparent;border-right-color:transparent;border-top-color:transparent;border-left-width:var(--ck-tooltip-arrow-size);border-bottom-width:var(--ck-tooltip-arrow-size);border-right-width:0;border-top-width:var(--ck-tooltip-arrow-size)}\", \"\",{\"version\":3,\"sources\":[\"webpack://./node_modules/@ckeditor/ckeditor5-ui/theme/components/tooltip/tooltip.css\",\"webpack://./node_modules/@ckeditor/ckeditor5-theme-lark/theme/ckeditor5-ui/components/tooltip/tooltip.css\",\"webpack://./node_modules/@ckeditor/ckeditor5-theme-lark/theme/mixins/_rounded.css\"],\"names\":[],\"mappings\":\"AAKA,sDAEC,iBAAkB,CAGlB,mBAAoB,CAIpB,kCACD,CAEA,eAEC,iBAAkB,CAClB,SAAU,CACV,YAAa,CACb,yBAWD,CATC,iCACC,oBAOD,CALC,uCACC,UAAW,CACX,OAAQ,CACR,QACD,CCxBF,MACC,2BACD,CAEA,eACC,QAAS,CAMT,KAAM,CAON,sCAwKD,CAtKC,iCChBA,eDqCA,CArBA,yGCZC,qCDiCD,CArBA,iCAGC,cAAe,CACf,eAAgB,CAChB,kCAAmC,CACnC,wDAAyD,CACzD,6CAA8C,CAC9C,iBAAkB,CAClB,SAYD,CAVC,uCAMC,sCAAuC,CACvC,kBAAmB,CACnB,QACD,CAYD,sFAGC,4CAA+C,CAC/C,0BASD,CAPC,8JAEC,+CAAkD,CAClD,0BAA6B,CAC7B,6BAAoF,CAApF,sDAAoF,CAApF,8BAAoF,CAApF,4BAAoF,CACpF,8CAAsG,CAAtG,gDAAsG,CAAtG,+CAAsG,CAAtG,kBACD,CAaD,6BACC,SAAU,CACV,SAWD,CATC,+CACC,SAAU,CACV,2CACD,CAEA,qDACC,SAAU,CACV,OACD,CAYD,6BACC,QAAS,CACT,UAYD,CAVC,+CACC,UAAW,CACX,0CACD,CAEA,qDACC,UAAW,CACX,MAAO,CACP,yBACD,CAYD,4BACC,yCAA4C,CAC5C,2BAQD,CANC,oDACC,4CAA+C,CAC/C,0BAA6B,CAC7B,6BAAoF,CAApF,+BAAoF,CAApF,8BAAoF,CAApF,mDAAoF,CACpF,8CAAsG,CAAtG,qBAAsG,CAAtG,+CAAsG,CAAtG,6CACD,CAUD,4BACC,8CAA+C,CAC/C,OAaD,CAXC,8CACC,MAAO,CACP,0BAQD,CANC,oDACC,0CAA6C,CAC7C,8CAAiD,CACjD,6BAAoF,CAApF,+BAAoF,CAApF,qDAAoF,CAApF,4BAAoF,CACpF,mBAAsG,CAAtG,gDAAsG,CAAtG,+CAAsG,CAAtG,6CACD,CAWF,4BACC,+CAAgD,CAChD,SAAU,CACV,OAaD,CAXC,8CACC,MAAO,CACP,0BAQD,CANC,oDACC,SAAU,CACV,8CAAiD,CACjD,oDAAoF,CAApF,+BAAoF,CAApF,8BAAoF,CAApF,4BAAoF,CACpF,8CAAsG,CAAtG,gDAAsG,CAAtG,oBAAsG,CAAtG,6CACD\",\"sourcesContent\":[\"/*\\n * Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\\n */\\n\\n.ck.ck-tooltip,\\n.ck.ck-tooltip .ck-tooltip__text::after {\\n\\tposition: absolute;\\n\\n\\t/* Without this, hovering the tooltip could keep it visible. */\\n\\tpointer-events: none;\\n\\n\\t/* This is to get rid of flickering when transitioning opacity in Chrome.\\n\\tIt's weird but it works. */\\n\\t-webkit-backface-visibility: hidden;\\n}\\n\\n.ck.ck-tooltip {\\n\\t/* Tooltip is hidden by default. */\\n\\tvisibility: hidden;\\n\\topacity: 0;\\n\\tdisplay: none;\\n\\tz-index: var(--ck-z-modal);\\n\\n\\t& .ck-tooltip__text {\\n\\t\\tdisplay: inline-block;\\n\\n\\t\\t&::after {\\n\\t\\t\\tcontent: \\\"\\\";\\n\\t\\t\\twidth: 0;\\n\\t\\t\\theight: 0;\\n\\t\\t}\\n\\t}\\n}\\n\",\"/*\\n * Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\\n */\\n\\n@import \\\"../../../mixins/_rounded.css\\\";\\n\\n:root {\\n\\t--ck-tooltip-arrow-size: 5px;\\n}\\n\\n.ck.ck-tooltip {\\n\\tleft: 50%;\\n\\n\\t/*\\n\\t * Prevent blurry tooltips in LoDPI environments.\\n\\t * See https://github.com/ckeditor/ckeditor5/issues/1802.\\n\\t */\\n\\ttop: 0;\\n\\n\\t/*\\n\\t * For the transition to work, the tooltip must be controlled\\n\\t * using visibility+opacity. A delay prevents a \\\"tooltip avalanche\\\"\\n\\t * i.e. when scanning the toolbar with mouse cursor.\\n\\t */\\n\\ttransition: opacity .2s ease-in-out .2s;\\n\\n\\t& .ck-tooltip__text {\\n\\t\\t@mixin ck-rounded-corners;\\n\\n\\t\\tfont-size: .9em;\\n\\t\\tline-height: 1.5;\\n\\t\\tcolor: var(--ck-color-tooltip-text);\\n\\t\\tpadding: var(--ck-spacing-small) var(--ck-spacing-medium);\\n\\t\\tbackground: var(--ck-color-tooltip-background);\\n\\t\\tposition: relative;\\n\\t\\tleft: -50%;\\n\\n\\t\\t&::after {\\n\\t\\t\\t/*\\n\\t\\t\\t * For the transition to work, the tooltip must be controlled\\n\\t\\t\\t * using visibility+opacity. A delay prevents a \\\"tooltip avalanche\\\"\\n\\t\\t\\t * i.e. when scanning the toolbar with mouse cursor.\\n\\t\\t\\t */\\n\\t\\t\\ttransition: opacity .2s ease-in-out .2s;\\n\\t\\t\\tborder-style: solid;\\n\\t\\t\\tleft: 50%;\\n\\t\\t}\\n\\t}\\n\\n\\t/**\\n\\t * A class that displays the tooltip south of the element.\\n\\t *\\n\\t *       [element]\\n\\t *           ^\\n\\t *     +-----------+\\n\\t *     |  Tooltip  |\\n\\t *     +-----------+\\n\\t */\\n\\t&.ck-tooltip_s,\\n\\t&.ck-tooltip_sw,\\n\\t&.ck-tooltip_se {\\n\\t\\tbottom: calc(-1 * var(--ck-tooltip-arrow-size));\\n\\t\\ttransform: translateY( 100% );\\n\\n\\t\\t& .ck-tooltip__text::after {\\n\\t\\t\\t/* 1px addresses gliches in rendering causing gap between the triangle and the text */\\n\\t\\t\\ttop: calc(-1 * var(--ck-tooltip-arrow-size) + 1px);\\n\\t\\t\\ttransform: translateX( -50% );\\n\\t\\t\\tborder-color: transparent transparent var(--ck-color-tooltip-background) transparent;\\n\\t\\t\\tborder-width: 0 var(--ck-tooltip-arrow-size) var(--ck-tooltip-arrow-size) var(--ck-tooltip-arrow-size);\\n\\t\\t}\\n\\t}\\n\\n\\t/**\\n\\t * A class that displays the tooltip south-west of the element.\\n\\t *\\n\\t *        [element]\\n\\t *            ^\\n\\t *  +-----------+\\n\\t *  |  Tooltip  |\\n\\t *  +-----------+\\n\\t */\\n\\n\\t&.ck-tooltip_sw {\\n\\t\\tright: 50%;\\n\\t\\tleft: auto;\\n\\n\\t\\t& .ck-tooltip__text {\\n\\t\\t\\tleft: auto;\\n\\t\\t\\tright: calc( -2 * var(--ck-tooltip-arrow-size));\\n\\t\\t}\\n\\n\\t\\t& .ck-tooltip__text::after {\\n\\t\\t\\tleft: auto;\\n\\t\\t\\tright: 0;\\n\\t\\t}\\n\\t}\\n\\n\\t/**\\n\\t * A class that displays the tooltip south-east of the element.\\n\\t *\\n\\t *  [element]\\n\\t *      ^\\n\\t *    +-----------+\\n\\t *    |  Tooltip  |\\n\\t *    +-----------+\\n\\t */\\n\\t&.ck-tooltip_se {\\n\\t\\tleft: 50%;\\n\\t\\tright: auto;\\n\\n\\t\\t& .ck-tooltip__text {\\n\\t\\t\\tright: auto;\\n\\t\\t\\tleft: calc( -2 * var(--ck-tooltip-arrow-size));\\n\\t\\t}\\n\\n\\t\\t& .ck-tooltip__text::after {\\n\\t\\t\\tright: auto;\\n\\t\\t\\tleft: 0;\\n\\t\\t\\ttransform: translateX( 50% );\\n\\t\\t}\\n\\t}\\n\\n\\t/**\\n\\t * A class that displays the tooltip north of the element.\\n\\t *\\n\\t *     +-----------+\\n\\t *     |  Tooltip  |\\n\\t *     +-----------+\\n\\t *           V\\n\\t *       [element]\\n\\t */\\n\\t&.ck-tooltip_n {\\n\\t\\ttop: calc(-1 * var(--ck-tooltip-arrow-size));\\n\\t\\ttransform: translateY( -100% );\\n\\n\\t\\t& .ck-tooltip__text::after {\\n\\t\\t\\tbottom: calc(-1 * var(--ck-tooltip-arrow-size));\\n\\t\\t\\ttransform: translateX( -50% );\\n\\t\\t\\tborder-color: var(--ck-color-tooltip-background) transparent transparent transparent;\\n\\t\\t\\tborder-width: var(--ck-tooltip-arrow-size) var(--ck-tooltip-arrow-size) 0 var(--ck-tooltip-arrow-size);\\n\\t\\t}\\n\\t}\\n\\n\\t/**\\n\\t * A class that displays the tooltip east of the element.\\n\\t *\\n\\t *                +----------+\\n\\t *    [element] < |   east   |\\n\\t *                +----------+\\n\\t */\\n\\t&.ck-tooltip_e {\\n\\t\\tleft: calc(100% + var(--ck-tooltip-arrow-size));\\n\\t\\ttop: 50%;\\n\\n\\t\\t& .ck-tooltip__text {\\n\\t\\t\\tleft: 0;\\n\\t\\t\\ttransform: translateY( -50% );\\n\\n\\t\\t\\t&::after {\\n\\t\\t\\t\\tleft: calc(-1 * var(--ck-tooltip-arrow-size));\\n\\t\\t\\t\\ttop: calc(50% - 1 * var(--ck-tooltip-arrow-size));\\n\\t\\t\\t\\tborder-color: transparent var(--ck-color-tooltip-background) transparent transparent;\\n\\t\\t\\t\\tborder-width: var(--ck-tooltip-arrow-size) var(--ck-tooltip-arrow-size) var(--ck-tooltip-arrow-size) 0;\\n\\t\\t\\t}\\n\\t\\t}\\n\\t}\\n\\n\\t/**\\n\\t * A class that displays the tooltip west of the element.\\n\\t *\\n\\t *    +----------+\\n\\t *    |   west   | > [element]\\n\\t *    +----------+\\n\\t */\\n\\t&.ck-tooltip_w {\\n\\t\\tright: calc(100% + var(--ck-tooltip-arrow-size));\\n\\t\\tleft: auto;\\n\\t\\ttop: 50%;\\n\\n\\t\\t& .ck-tooltip__text {\\n\\t\\t\\tleft: 0;\\n\\t\\t\\ttransform: translateY( -50% );\\n\\n\\t\\t\\t&::after {\\n\\t\\t\\t\\tleft: 100%;\\n\\t\\t\\t\\ttop: calc(50% - 1 * var(--ck-tooltip-arrow-size));\\n\\t\\t\\t\\tborder-color: transparent transparent transparent var(--ck-color-tooltip-background);\\n\\t\\t\\t\\tborder-width: var(--ck-tooltip-arrow-size) 0 var(--ck-tooltip-arrow-size) var(--ck-tooltip-arrow-size);\\n\\t\\t\\t}\\n\\t\\t}\\n\\t}\\n}\\n\",\"/*\\n * Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\\n */\\n\\n/**\\n * Implements rounded corner interface for .ck-rounded-corners class.\\n *\\n * @see $ck-border-radius\\n */\\n@define-mixin ck-rounded-corners {\\n\\tborder-radius: 0;\\n\\n\\t@nest .ck-rounded-corners &,\\n\\t&.ck-rounded-corners {\\n\\t\\tborder-radius: var(--ck-border-radius);\\n\\t\\t@mixin-content;\\n\\t}\\n}\\n\"],\"sourceRoot\":\"\"}]);\n// Exports\nexport default ___CSS_LOADER_EXPORT___;\n","// Imports\nimport ___CSS_LOADER_API_SOURCEMAP_IMPORT___ from \"../../../../../css-loader/dist/runtime/cssWithMappingToString.js\";\nimport ___CSS_LOADER_API_IMPORT___ from \"../../../../../css-loader/dist/runtime/api.js\";\nvar ___CSS_LOADER_EXPORT___ = ___CSS_LOADER_API_IMPORT___(___CSS_LOADER_API_SOURCEMAP_IMPORT___);\n// Module\n___CSS_LOADER_EXPORT___.push([module.id, \".ck.ck-button,a.ck.ck-button{-moz-user-select:none;-webkit-user-select:none;-ms-user-select:none;user-select:none}.ck.ck-button .ck-tooltip,a.ck.ck-button .ck-tooltip{display:block}@media (hover:none){.ck.ck-button .ck-tooltip,a.ck.ck-button .ck-tooltip{display:none}}.ck.ck-button,a.ck.ck-button{position:relative;display:inline-flex;align-items:center;justify-content:left}.ck.ck-button .ck-button__label,a.ck.ck-button .ck-button__label{display:none}.ck.ck-button.ck-button_with-text .ck-button__label,a.ck.ck-button.ck-button_with-text .ck-button__label{display:inline-block}.ck.ck-button:not(.ck-button_with-text),a.ck.ck-button:not(.ck-button_with-text){justify-content:center}.ck.ck-button:hover .ck-tooltip,a.ck.ck-button:hover .ck-tooltip{visibility:visible;opacity:1}.ck.ck-button:focus:not(:hover) .ck-tooltip,a.ck.ck-button:focus:not(:hover) .ck-tooltip{display:none}.ck.ck-button,a.ck.ck-button{background:var(--ck-color-button-default-background)}.ck.ck-button:not(.ck-disabled):hover,a.ck.ck-button:not(.ck-disabled):hover{background:var(--ck-color-button-default-hover-background)}.ck.ck-button:not(.ck-disabled):active,a.ck.ck-button:not(.ck-disabled):active{background:var(--ck-color-button-default-active-background);box-shadow:inset 0 2px 2px var(--ck-color-button-default-active-shadow)}.ck.ck-button.ck-disabled,a.ck.ck-button.ck-disabled{background:var(--ck-color-button-default-disabled-background)}.ck.ck-button,a.ck.ck-button{border-radius:0}.ck-rounded-corners .ck.ck-button,.ck-rounded-corners a.ck.ck-button,.ck.ck-button.ck-rounded-corners,a.ck.ck-button.ck-rounded-corners{border-radius:var(--ck-border-radius)}.ck.ck-button,a.ck.ck-button{white-space:nowrap;cursor:default;vertical-align:middle;padding:var(--ck-spacing-tiny);text-align:center;min-width:var(--ck-ui-component-min-height);min-height:var(--ck-ui-component-min-height);line-height:1;font-size:inherit;border:1px solid transparent;transition:box-shadow .2s ease-in-out,border .2s ease-in-out;-webkit-appearance:none}.ck.ck-button:active,.ck.ck-button:focus,a.ck.ck-button:active,a.ck.ck-button:focus{outline:none;border:var(--ck-focus-ring);box-shadow:var(--ck-focus-outer-shadow),0 0}.ck.ck-button .ck-button__icon use,.ck.ck-button .ck-button__icon use *,a.ck.ck-button .ck-button__icon use,a.ck.ck-button .ck-button__icon use *{color:inherit}.ck.ck-button .ck-button__label,a.ck.ck-button .ck-button__label{font-size:inherit;font-weight:inherit;color:inherit;cursor:inherit;vertical-align:middle}[dir=ltr] .ck.ck-button .ck-button__label,[dir=ltr] a.ck.ck-button .ck-button__label{text-align:left}[dir=rtl] .ck.ck-button .ck-button__label,[dir=rtl] a.ck.ck-button .ck-button__label{text-align:right}.ck.ck-button .ck-button__keystroke,a.ck.ck-button .ck-button__keystroke{color:inherit}[dir=ltr] .ck.ck-button .ck-button__keystroke,[dir=ltr] a.ck.ck-button .ck-button__keystroke{margin-left:var(--ck-spacing-large)}[dir=rtl] .ck.ck-button .ck-button__keystroke,[dir=rtl] a.ck.ck-button .ck-button__keystroke{margin-right:var(--ck-spacing-large)}.ck.ck-button .ck-button__keystroke,a.ck.ck-button .ck-button__keystroke{font-weight:700;opacity:.7}.ck.ck-button.ck-disabled:active,.ck.ck-button.ck-disabled:focus,a.ck.ck-button.ck-disabled:active,a.ck.ck-button.ck-disabled:focus{box-shadow:var(--ck-focus-disabled-outer-shadow),0 0}.ck.ck-button.ck-disabled .ck-button__icon,a.ck.ck-button.ck-disabled .ck-button__icon{opacity:var(--ck-disabled-opacity)}.ck.ck-button.ck-disabled .ck-button__label,a.ck.ck-button.ck-disabled .ck-button__label{opacity:var(--ck-disabled-opacity)}.ck.ck-button.ck-disabled .ck-button__keystroke,a.ck.ck-button.ck-disabled .ck-button__keystroke{opacity:.3}.ck.ck-button.ck-button_with-text,a.ck.ck-button.ck-button_with-text{padding:var(--ck-spacing-tiny) var(--ck-spacing-standard)}[dir=ltr] .ck.ck-button.ck-button_with-text .ck-button__icon,[dir=ltr] a.ck.ck-button.ck-button_with-text .ck-button__icon{margin-left:calc(var(--ck-spacing-small)*-1);margin-right:var(--ck-spacing-small)}[dir=rtl] .ck.ck-button.ck-button_with-text .ck-button__icon,[dir=rtl] a.ck.ck-button.ck-button_with-text .ck-button__icon{margin-right:calc(var(--ck-spacing-small)*-1);margin-left:var(--ck-spacing-small)}.ck.ck-button.ck-button_with-keystroke .ck-button__label,a.ck.ck-button.ck-button_with-keystroke 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var(--ck-color-button-on-active-shadow)}.ck.ck-button.ck-on.ck-disabled,a.ck.ck-button.ck-on.ck-disabled{background:var(--ck-color-button-on-disabled-background)}.ck.ck-button.ck-button-save,a.ck.ck-button.ck-button-save{color:var(--ck-color-button-save)}.ck.ck-button.ck-button-cancel,a.ck.ck-button.ck-button-cancel{color:var(--ck-color-button-cancel)}.ck.ck-button-action,a.ck.ck-button-action{background:var(--ck-color-button-action-background)}.ck.ck-button-action:not(.ck-disabled):hover,a.ck.ck-button-action:not(.ck-disabled):hover{background:var(--ck-color-button-action-hover-background)}.ck.ck-button-action:not(.ck-disabled):active,a.ck.ck-button-action:not(.ck-disabled):active{background:var(--ck-color-button-action-active-background);box-shadow:inset 0 2px 2px var(--ck-color-button-action-active-shadow)}.ck.ck-button-action.ck-disabled,a.ck.ck-button-action.ck-disabled{background:var(--ck-color-button-action-disabled-background)}.ck.ck-button-action,a.ck.ck-button-action{color:var(--ck-color-button-action-text)}.ck.ck-button-bold,a.ck.ck-button-bold{font-weight:700}\", 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* Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\\n */\\n\\n@import \\\"../../mixins/_unselectable.css\\\";\\n@import \\\"../tooltip/mixins/_tooltip.css\\\";\\n\\n.ck.ck-button,\\na.ck.ck-button {\\n\\t@mixin ck-unselectable;\\n\\t@mixin ck-tooltip_enabled;\\n\\n\\tposition: relative;\\n\\tdisplay: inline-flex;\\n\\talign-items: center;\\n\\tjustify-content: left;\\n\\n\\t& .ck-button__label {\\n\\t\\tdisplay: none;\\n\\t}\\n\\n\\t&.ck-button_with-text {\\n\\t\\t& .ck-button__label {\\n\\t\\t\\tdisplay: inline-block;\\n\\t\\t}\\n\\t}\\n\\n\\t/* Center the icon horizontally in a button without text. */\\n\\t&:not(.ck-button_with-text)  {\\n\\t\\tjustify-content: center;\\n\\t}\\n\\n\\t&:hover {\\n\\t\\t@mixin ck-tooltip_visible;\\n\\t}\\n\\n\\t/* Get rid of the native focus outline around the tooltip when focused (but not :hover). */\\n\\t&:focus:not(:hover) {\\n\\t\\t@mixin ck-tooltip_disabled;\\n\\t}\\n}\\n\",\"/*\\n * Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\\n */\\n\\n/**\\n * Makes element unselectable.\\n */\\n@define-mixin ck-unselectable {\\n\\t-moz-user-select: none;\\n\\t-webkit-user-select: none;\\n\\t-ms-user-select: none;\\n\\tuser-select: none\\n}\\n\",\"/*\\n * Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\\n */\\n\\n/**\\n * Enables the tooltip, which is the tooltip is in DOM but\\n * not yet displayed.\\n */\\n@define-mixin ck-tooltip_enabled {\\n\\t& .ck-tooltip {\\n\\t\\tdisplay: block;\\n\\n\\t\\t/*\\n\\t\\t * Don't display tooltips in devices which don't support :hover.\\n\\t\\t * In fact, it's all about iOS, which forces user to click UI elements twice to execute\\n\\t\\t * the primary action, when tooltips are enabled.\\n\\t\\t *\\n\\t\\t * Q: OK, but why not the following query?\\n\\t\\t *\\n\\t\\t *   @media (hover) {\\n\\t\\t *       display: block;\\n\\t\\t *   }\\n\\t\\t *\\n\\t\\t * A: Because FF does not support it and it would completely disable tooltips\\n\\t\\t * in that browser.\\n\\t\\t *\\n\\t\\t * More in https://github.com/ckeditor/ckeditor5/issues/920.\\n\\t\\t */\\n\\t\\t@media (hover:none) {\\n\\t\\t\\tdisplay: none;\\n\\t\\t}\\n\\t}\\n}\\n\\n/**\\n * Disables the tooltip making it disappear from DOM.\\n */\\n@define-mixin ck-tooltip_disabled {\\n\\t& .ck-tooltip {\\n\\t\\tdisplay: none;\\n\\t}\\n}\\n\\n/**\\n * Shows the tooltip, which is already in DOM.\\n * Requires `ck-tooltip_enabled` first.\\n */\\n@define-mixin ck-tooltip_visible {\\n\\t& .ck-tooltip {\\n\\t\\tvisibility: visible;\\n\\t\\topacity: 1;\\n\\t}\\n}\\n\",\"/*\\n * Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\\n */\\n\\n@import \\\"../../../mixins/_focus.css\\\";\\n@import \\\"../../../mixins/_shadow.css\\\";\\n@import \\\"../../../mixins/_disabled.css\\\";\\n@import \\\"../../../mixins/_rounded.css\\\";\\n@import \\\"../../mixins/_button.css\\\";\\n@import \\\"@ckeditor/ckeditor5-ui/theme/mixins/_dir.css\\\";\\n\\n.ck.ck-button,\\na.ck.ck-button {\\n\\t@mixin ck-button-colors --ck-color-button-default;\\n\\t@mixin ck-rounded-corners;\\n\\n\\twhite-space: nowrap;\\n\\tcursor: default;\\n\\tvertical-align: middle;\\n\\tpadding: var(--ck-spacing-tiny);\\n\\ttext-align: center;\\n\\n\\t/* A very important piece of styling. Go to variable declaration to learn more. */\\n\\tmin-width: var(--ck-ui-component-min-height);\\n\\tmin-height: var(--ck-ui-component-min-height);\\n\\n\\t/* Normalize the height of the line. Removing this will break consistent height\\n\\tamong text and text-less buttons (with icons). */\\n\\tline-height: 1;\\n\\n\\t/* Enable font size inheritance, which allows fluid UI scaling. */\\n\\tfont-size: inherit;\\n\\n\\t/* Avoid flickering when the foucs border shows up. */\\n\\tborder: 1px solid transparent;\\n\\n\\t/* Apply some smooth transition to the box-shadow and border. */\\n\\ttransition: box-shadow .2s ease-in-out, border .2s ease-in-out;\\n\\n\\t/* https://github.com/ckeditor/ckeditor5-theme-lark/issues/189 */\\n\\t-webkit-appearance: none;\\n\\n\\t&:active,\\n\\t&:focus {\\n\\t\\t@mixin ck-focus-ring;\\n\\t\\t@mixin ck-box-shadow var(--ck-focus-outer-shadow);\\n\\t}\\n\\n\\t/* Allow icon coloring using the text \\\"color\\\" property. */\\n\\t& .ck-button__icon {\\n\\t\\t& use,\\n\\t\\t& use * {\\n\\t\\t\\tcolor: inherit;\\n\\t\\t}\\n\\t}\\n\\n\\t& .ck-button__label {\\n\\t\\t/* Enable font size inheritance, which allows fluid UI scaling. */\\n\\t\\tfont-size: inherit;\\n\\t\\tfont-weight: inherit;\\n\\t\\tcolor: inherit;\\n\\t\\tcursor: inherit;\\n\\n\\t\\t/* Must be consistent with .ck-icon's vertical align. Otherwise, buttons with and\\n\\t\\twithout labels (but with icons) have different sizes in Chrome */\\n\\t\\tvertical-align: middle;\\n\\n\\t\\t@mixin ck-dir ltr {\\n\\t\\t\\ttext-align: left;\\n\\t\\t}\\n\\n\\t\\t@mixin ck-dir rtl {\\n\\t\\t\\ttext-align: right;\\n\\t\\t}\\n\\t}\\n\\n\\t& .ck-button__keystroke {\\n\\t\\tcolor: inherit;\\n\\n\\t\\t@mixin ck-dir ltr {\\n\\t\\t\\tmargin-left: var(--ck-spacing-large);\\n\\t\\t}\\n\\n\\t\\t@mixin ck-dir rtl {\\n\\t\\t\\tmargin-right: var(--ck-spacing-large);\\n\\t\\t}\\n\\n\\t\\tfont-weight: bold;\\n\\t\\topacity: .7;\\n\\t}\\n\\n\\t/* https://github.com/ckeditor/ckeditor5-theme-lark/issues/70 */\\n\\t&.ck-disabled {\\n\\t\\t&:active,\\n\\t\\t&:focus {\\n\\t\\t\\t/* The disabled button should have a slightly less visible shadow when focused. */\\n\\t\\t\\t@mixin ck-box-shadow var(--ck-focus-disabled-outer-shadow);\\n\\t\\t}\\n\\n\\t\\t& .ck-button__icon {\\n\\t\\t\\t@mixin ck-disabled;\\n\\t\\t}\\n\\n\\t\\t/* https://github.com/ckeditor/ckeditor5-theme-lark/issues/98 */\\n\\t\\t& .ck-button__label {\\n\\t\\t\\t@mixin ck-disabled;\\n\\t\\t}\\n\\n\\t\\t& .ck-button__keystroke {\\n\\t\\t\\topacity: .3;\\n\\t\\t}\\n\\t}\\n\\n\\t&.ck-button_with-text {\\n\\t\\tpadding: var(--ck-spacing-tiny) var(--ck-spacing-standard);\\n\\n\\t\\t/* stylelint-disable-next-line no-descending-specificity */\\n\\t\\t& .ck-button__icon {\\n\\t\\t\\t@mixin ck-dir ltr {\\n\\t\\t\\t\\tmargin-left: calc(-1 * var(--ck-spacing-small));\\n\\t\\t\\t\\tmargin-right: var(--ck-spacing-small);\\n\\t\\t\\t}\\n\\n\\t\\t\\t@mixin ck-dir rtl {\\n\\t\\t\\t\\tmargin-right: calc(-1 * var(--ck-spacing-small));\\n\\t\\t\\t\\tmargin-left: var(--ck-spacing-small);\\n\\t\\t\\t}\\n\\t\\t}\\n\\t}\\n\\n\\t&.ck-button_with-keystroke {\\n\\t\\t/* stylelint-disable-next-line no-descending-specificity */\\n\\t\\t& .ck-button__label {\\n\\t\\t\\tflex-grow: 1;\\n\\t\\t}\\n\\t}\\n\\n\\t/* A style of the button which is currently on, e.g. its feature is active. */\\n\\t&.ck-on {\\n\\t\\t@mixin ck-button-colors --ck-color-button-on;\\n\\t}\\n\\n\\t&.ck-button-save {\\n\\t\\tcolor: var(--ck-color-button-save);\\n\\t}\\n\\n\\t&.ck-button-cancel {\\n\\t\\tcolor: var(--ck-color-button-cancel);\\n\\t}\\n}\\n\\n/* A style of the button which handles the primary action. */\\n.ck.ck-button-action,\\na.ck.ck-button-action {\\n\\t@mixin ck-button-colors --ck-color-button-action;\\n\\n\\tcolor: var(--ck-color-button-action-text);\\n}\\n\\n.ck.ck-button-bold,\\na.ck.ck-button-bold {\\n\\tfont-weight: bold;\\n}\\n\",\"/*\\n * Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\\n */\\n\\n/**\\n * Implements a button of given background color.\\n *\\n * @param {String} $background - Background color of the button.\\n * @param {String} $border - Border color of the button.\\n */\\n@define-mixin ck-button-colors $prefix {\\n\\tbackground: var($(prefix)-background);\\n\\n\\t&:not(.ck-disabled) {\\n\\t\\t&:hover {\\n\\t\\t\\tbackground: var($(prefix)-hover-background);\\n\\t\\t}\\n\\n\\t\\t&:active {\\n\\t\\t\\tbackground: var($(prefix)-active-background);\\n\\t\\t\\tbox-shadow: inset 0 2px 2px var($(prefix)-active-shadow);\\n\\t\\t}\\n\\t}\\n\\n\\t/* https://github.com/ckeditor/ckeditor5-theme-lark/issues/98 */\\n\\t&.ck-disabled {\\n\\t\\tbackground: var($(prefix)-disabled-background);\\n\\t}\\n}\\n\",\"/*\\n * Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\\n */\\n\\n/**\\n * Implements rounded corner interface for .ck-rounded-corners class.\\n *\\n * @see $ck-border-radius\\n */\\n@define-mixin ck-rounded-corners {\\n\\tborder-radius: 0;\\n\\n\\t@nest .ck-rounded-corners &,\\n\\t&.ck-rounded-corners {\\n\\t\\tborder-radius: var(--ck-border-radius);\\n\\t\\t@mixin-content;\\n\\t}\\n}\\n\",\"/*\\n * Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\\n */\\n\\n/**\\n * A visual style of focused element's border.\\n */\\n@define-mixin ck-focus-ring {\\n\\t/* Disable native outline. */\\n\\toutline: none;\\n\\tborder: var(--ck-focus-ring)\\n}\\n\",\"/*\\n * Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\\n */\\n\\n/**\\n * A helper to combine multiple shadows.\\n */\\n@define-mixin ck-box-shadow $shadowA, $shadowB: 0 0 {\\n\\tbox-shadow: $shadowA, $shadowB;\\n}\\n\\n/**\\n * Gives an element a drop shadow so it looks like a floating panel.\\n */\\n@define-mixin ck-drop-shadow {\\n\\t@mixin ck-box-shadow var(--ck-drop-shadow);\\n}\\n\",\"/*\\n * Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\\n */\\n\\n/**\\n * A class which indicates that an element holding it is disabled.\\n */\\n@define-mixin ck-disabled {\\n\\topacity: var(--ck-disabled-opacity);\\n}\\n\"],\"sourceRoot\":\"\"}]);\n// Exports\nexport default ___CSS_LOADER_EXPORT___;\n","// Imports\nimport ___CSS_LOADER_API_SOURCEMAP_IMPORT___ from \"../../../../../css-loader/dist/runtime/cssWithMappingToString.js\";\nimport ___CSS_LOADER_API_IMPORT___ from \"../../../../../css-loader/dist/runtime/api.js\";\nvar ___CSS_LOADER_EXPORT___ = ___CSS_LOADER_API_IMPORT___(___CSS_LOADER_API_SOURCEMAP_IMPORT___);\n// Module\n___CSS_LOADER_EXPORT___.push([module.id, \".ck.ck-list{-moz-user-select:none;-webkit-user-select:none;-ms-user-select:none;user-select:none;display:flex;flex-direction:column}.ck.ck-list .ck-list__item,.ck.ck-list .ck-list__separator{display:block}.ck.ck-list .ck-list__item>:focus{position:relative;z-index:var(--ck-z-default)}.ck.ck-list{border-radius:0}.ck-rounded-corners .ck.ck-list,.ck.ck-list.ck-rounded-corners{border-radius:var(--ck-border-radius)}.ck.ck-list{list-style-type:none;background:var(--ck-color-list-background)}.ck.ck-list__item{cursor:default;min-width:12em}.ck.ck-list__item .ck-button{min-height:unset;width:100%;text-align:left;border-radius:0;padding:calc(var(--ck-line-height-base)*0.2*var(--ck-font-size-base)) calc(var(--ck-line-height-base)*0.4*var(--ck-font-size-base))}.ck.ck-list__item .ck-button .ck-button__label{line-height:calc(var(--ck-line-height-base)*1.2*var(--ck-font-size-base))}.ck.ck-list__item .ck-button:active{box-shadow:none}.ck.ck-list__item .ck-button.ck-on{background:var(--ck-color-list-button-on-background);color:var(--ck-color-list-button-on-text)}.ck.ck-list__item .ck-button.ck-on:active{box-shadow:none}.ck.ck-list__item .ck-button.ck-on:hover:not(.ck-disabled){background:var(--ck-color-list-button-on-background-focus)}.ck.ck-list__item .ck-button.ck-on:focus:not(.ck-disabled){border-color:var(--ck-color-base-background)}.ck.ck-list__item .ck-button:hover:not(.ck-disabled){background:var(--ck-color-list-button-hover-background)}.ck.ck-list__item .ck-switchbutton.ck-on{background:var(--ck-color-list-background);color:inherit}.ck.ck-list__item .ck-switchbutton.ck-on:hover:not(.ck-disabled){background:var(--ck-color-list-button-hover-background);color:inherit}.ck.ck-list__separator{height:1px;width:100%;background:var(--ck-color-base-border)}\", \"\",{\"version\":3,\"sources\":[\"webpack://./node_modules/@ckeditor/ckeditor5-ui/theme/components/list/list.css\",\"webpack://./node_modules/@ckeditor/ckeditor5-ui/theme/mixins/_unselectable.css\",\"webpack://./node_modules/@ckeditor/ckeditor5-theme-lark/theme/ckeditor5-ui/components/list/list.css\",\"webpack://./node_modules/@ckeditor/ckeditor5-theme-lark/theme/mixins/_rounded.css\"],\"names\":[],\"mappings\":\"AAOA,YCEC,qBAAsB,CACtB,wBAAyB,CACzB,oBAAqB,CACrB,gBAAgB,CDFhB,YAAa,CACb,qBAcD,CAZC,2DAEC,aACD,CAKA,kCACC,iBAAkB,CAClB,2BACD,CEfD,YCEC,eDGD,CALA,+DCME,qCDDF,CALA,YAGC,oBAAqB,CACrB,0CACD,CAEA,kBACC,cAAe,CACf,cA2DD,CAzDC,6BACC,gBAAiB,CACjB,UAAW,CACX,eAAgB,CAChB,eAAgB,CAKhB,mIAiCD,CA7BC,+CAEC,yEACD,CAEA,oCACC,eACD,CAEA,mCACC,oDAAqD,CACrD,yCAaD,CAXC,0CACC,eACD,CAEA,2DACC,0DACD,CAEA,2DACC,4CACD,CAGD,qDACC,uDACD,CAMA,yCACC,0CAA2C,CAC3C,aAMD,CAJC,iEACC,uDAAwD,CACxD,aACD,CAKH,uBACC,UAAW,CACX,UAAW,CACX,sCACD\",\"sourcesContent\":[\"/*\\n * Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\\n */\\n\\n@import \\\"../../mixins/_unselectable.css\\\";\\n\\n.ck.ck-list {\\n\\t@mixin ck-unselectable;\\n\\n\\tdisplay: flex;\\n\\tflex-direction: column;\\n\\n\\t& .ck-list__item,\\n\\t& .ck-list__separator {\\n\\t\\tdisplay: block;\\n\\t}\\n\\n\\t/* Make sure that whatever child of the list item gets focus, it remains on the\\n\\ttop. Thanks to that, styles like box-shadow, outline, etc. are not masked by\\n\\tadjacent list items. */\\n\\t& .ck-list__item > *:focus {\\n\\t\\tposition: relative;\\n\\t\\tz-index: var(--ck-z-default);\\n\\t}\\n}\\n\",\"/*\\n * Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\\n */\\n\\n/**\\n * Makes element unselectable.\\n */\\n@define-mixin ck-unselectable {\\n\\t-moz-user-select: none;\\n\\t-webkit-user-select: none;\\n\\t-ms-user-select: none;\\n\\tuser-select: none\\n}\\n\",\"/*\\n * Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\\n */\\n\\n@import \\\"../../../mixins/_disabled.css\\\";\\n@import \\\"../../../mixins/_rounded.css\\\";\\n@import \\\"../../../mixins/_shadow.css\\\";\\n\\n.ck.ck-list {\\n\\t@mixin ck-rounded-corners;\\n\\n\\tlist-style-type: none;\\n\\tbackground: var(--ck-color-list-background);\\n}\\n\\n.ck.ck-list__item {\\n\\tcursor: default;\\n\\tmin-width: 12em;\\n\\n\\t& .ck-button {\\n\\t\\tmin-height: unset;\\n\\t\\twidth: 100%;\\n\\t\\ttext-align: left;\\n\\t\\tborder-radius: 0;\\n\\n\\t\\t/* List items should have the same height. Use absolute units to make sure it is so\\n\\t\\t   because e.g. different heading styles may have different height\\n\\t\\t   https://github.com/ckeditor/ckeditor5-heading/issues/63 */\\n\\t\\tpadding:\\n\\t\\t\\tcalc(.2 * var(--ck-line-height-base) * var(--ck-font-size-base))\\n\\t\\t\\tcalc(.4 * var(--ck-line-height-base) * var(--ck-font-size-base));\\n\\n\\t\\t& .ck-button__label {\\n\\t\\t\\t/* https://github.com/ckeditor/ckeditor5-heading/issues/63 */\\n\\t\\t\\tline-height: calc(1.2 * var(--ck-line-height-base) * var(--ck-font-size-base));\\n\\t\\t}\\n\\n\\t\\t&:active {\\n\\t\\t\\tbox-shadow: none;\\n\\t\\t}\\n\\n\\t\\t&.ck-on {\\n\\t\\t\\tbackground: var(--ck-color-list-button-on-background);\\n\\t\\t\\tcolor: var(--ck-color-list-button-on-text);\\n\\n\\t\\t\\t&:active {\\n\\t\\t\\t\\tbox-shadow: none;\\n\\t\\t\\t}\\n\\n\\t\\t\\t&:hover:not(.ck-disabled) {\\n\\t\\t\\t\\tbackground: var(--ck-color-list-button-on-background-focus);\\n\\t\\t\\t}\\n\\n\\t\\t\\t&:focus:not(.ck-disabled) {\\n\\t\\t\\t\\tborder-color: var(--ck-color-base-background);\\n\\t\\t\\t}\\n\\t\\t}\\n\\n\\t\\t&:hover:not(.ck-disabled) {\\n\\t\\t\\tbackground: var(--ck-color-list-button-hover-background);\\n\\t\\t}\\n\\t}\\n\\n\\t/* It's unnecessary to change the background/text of a switch toggle; it has different ways\\n\\tof conveying its state (like the switcher) */\\n\\t& .ck-switchbutton {\\n\\t\\t&.ck-on {\\n\\t\\t\\tbackground: var(--ck-color-list-background);\\n\\t\\t\\tcolor: inherit;\\n\\n\\t\\t\\t&:hover:not(.ck-disabled) {\\n\\t\\t\\t\\tbackground: var(--ck-color-list-button-hover-background);\\n\\t\\t\\t\\tcolor: inherit;\\n\\t\\t\\t}\\n\\t\\t}\\n\\t}\\n}\\n\\n.ck.ck-list__separator {\\n\\theight: 1px;\\n\\twidth: 100%;\\n\\tbackground: var(--ck-color-base-border);\\n}\\n\",\"/*\\n * Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\\n */\\n\\n/**\\n * Implements rounded corner interface for .ck-rounded-corners class.\\n *\\n * @see $ck-border-radius\\n */\\n@define-mixin ck-rounded-corners {\\n\\tborder-radius: 0;\\n\\n\\t@nest .ck-rounded-corners &,\\n\\t&.ck-rounded-corners {\\n\\t\\tborder-radius: var(--ck-border-radius);\\n\\t\\t@mixin-content;\\n\\t}\\n}\\n\"],\"sourceRoot\":\"\"}]);\n// Exports\nexport default ___CSS_LOADER_EXPORT___;\n","// Imports\nimport ___CSS_LOADER_API_SOURCEMAP_IMPORT___ from \"../../../../../css-loader/dist/runtime/cssWithMappingToString.js\";\nimport ___CSS_LOADER_API_IMPORT___ from \"../../../../../css-loader/dist/runtime/api.js\";\nvar ___CSS_LOADER_EXPORT___ = ___CSS_LOADER_API_IMPORT___(___CSS_LOADER_API_SOURCEMAP_IMPORT___);\n// Module\n___CSS_LOADER_EXPORT___.push([module.id, \".ck.ck-button.ck-switchbutton .ck-button__toggle,.ck.ck-button.ck-switchbutton .ck-button__toggle .ck-button__toggle__inner{display:block}:root{--ck-switch-button-toggle-width:2.6153846154em;--ck-switch-button-toggle-inner-size:1.0769230769em;--ck-switch-button-toggle-spacing:1px;--ck-switch-button-translation:calc(var(--ck-switch-button-toggle-width) - var(--ck-switch-button-toggle-inner-size) - var(--ck-switch-button-toggle-spacing)*2)}[dir=ltr] .ck.ck-button.ck-switchbutton .ck-button__label{margin-right:calc(var(--ck-spacing-large)*2)}[dir=rtl] .ck.ck-button.ck-switchbutton .ck-button__label{margin-left:calc(var(--ck-spacing-large)*2)}.ck.ck-button.ck-switchbutton .ck-button__toggle{border-radius:0}.ck-rounded-corners .ck.ck-button.ck-switchbutton .ck-button__toggle,.ck.ck-button.ck-switchbutton .ck-button__toggle.ck-rounded-corners{border-radius:var(--ck-border-radius)}[dir=ltr] .ck.ck-button.ck-switchbutton .ck-button__toggle{margin-left:auto}[dir=rtl] .ck.ck-button.ck-switchbutton .ck-button__toggle{margin-right:auto}.ck.ck-button.ck-switchbutton .ck-button__toggle{transition:background .4s ease;width:var(--ck-switch-button-toggle-width);background:var(--ck-color-switch-button-off-background)}.ck.ck-button.ck-switchbutton .ck-button__toggle .ck-button__toggle__inner{border-radius:0}.ck-rounded-corners .ck.ck-button.ck-switchbutton .ck-button__toggle .ck-button__toggle__inner,.ck.ck-button.ck-switchbutton .ck-button__toggle .ck-button__toggle__inner.ck-rounded-corners{border-radius:var(--ck-border-radius);border-radius:calc(var(--ck-border-radius)*0.5)}.ck.ck-button.ck-switchbutton .ck-button__toggle .ck-button__toggle__inner{margin:var(--ck-switch-button-toggle-spacing);width:var(--ck-switch-button-toggle-inner-size);height:var(--ck-switch-button-toggle-inner-size);background:var(--ck-color-switch-button-inner-background);transition:all .3s ease}.ck.ck-button.ck-switchbutton .ck-button__toggle:hover{background:var(--ck-color-switch-button-off-hover-background)}.ck.ck-button.ck-switchbutton .ck-button__toggle:hover .ck-button__toggle__inner{box-shadow:0 0 0 5px var(--ck-color-switch-button-inner-shadow)}.ck.ck-button.ck-switchbutton.ck-disabled .ck-button__toggle{opacity:var(--ck-disabled-opacity)}.ck.ck-button.ck-switchbutton.ck-on .ck-button__toggle{background:var(--ck-color-switch-button-on-background)}.ck.ck-button.ck-switchbutton.ck-on .ck-button__toggle:hover{background:var(--ck-color-switch-button-on-hover-background)}[dir=ltr] .ck.ck-button.ck-switchbutton.ck-on .ck-button__toggle .ck-button__toggle__inner{transform:translateX(var(--ck-switch-button-translation))}[dir=rtl] .ck.ck-button.ck-switchbutton.ck-on .ck-button__toggle .ck-button__toggle__inner{transform:translateX(calc(var(--ck-switch-button-translation)*-1))}\", \"\",{\"version\":3,\"sources\":[\"webpack://./node_modules/@ckeditor/ckeditor5-ui/theme/components/button/switchbutton.css\",\"webpack://./node_modules/@ckeditor/ckeditor5-theme-lark/theme/ckeditor5-ui/components/button/switchbutton.css\",\"webpack://./node_modules/@ckeditor/ckeditor5-theme-lark/theme/mixins/_rounded.css\",\"webpack://./node_modules/@ckeditor/ckeditor5-theme-lark/theme/mixins/_disabled.css\"],\"names\":[],\"mappings\":\"AASE,4HACC,aACD,CCCF,MAEC,8CAA+C,CAE/C,mDAAoD,CACpD,qCAAsC,CACtC,gKAKD,CAGC,0DAGE,4CAOF,CAVA,0DAQE,2CAEF,CAEA,iDC3BA,eDoEA,CAzCA,yICvBC,qCDgED,CAzCA,2DAKE,gBAoCF,CAzCA,2DAUE,iBA+BF,CAzCA,iDAcC,8BAAiC,CAEjC,0CAA2C,CAC3C,uDAwBD,CAtBC,2EC9CD,eD2DC,CAbA,6LC1CA,qCAAsC,CD4CpC,+CAWF,CAbA,2EAMC,6CAA8C,CAC9C,+CAAgD,CAChD,gDAAiD,CACjD,yDAA0D,CAG1D,uBACD,CAEA,uDACC,6DAKD,CAHC,iFACC,+DACD,CAIF,6DExEA,kCF0EA,CAEA,uDACC,sDAkBD,CAhBC,6DACC,4DACD,CAEA,2FAKE,yDAMF,CAXA,2FASE,kEAEF\",\"sourcesContent\":[\"/*\\n * Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\\n */\\n\\n.ck.ck-button.ck-switchbutton {\\n\\t& .ck-button__toggle {\\n\\t\\tdisplay: block;\\n\\n\\t\\t& .ck-button__toggle__inner {\\n\\t\\t\\tdisplay: block;\\n\\t\\t}\\n\\t}\\n}\\n\",\"/*\\n * Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\\n */\\n\\n@import \\\"../../../mixins/_rounded.css\\\";\\n@import \\\"../../../mixins/_disabled.css\\\";\\n@import \\\"@ckeditor/ckeditor5-ui/theme/mixins/_dir.css\\\";\\n\\n/* Note: To avoid rendering issues (aliasing) but to preserve the responsive nature\\nof the component, floating–point numbers have been used which, for the default font size\\n(see: --ck-font-size-base), will generate simple integers. */\\n:root {\\n\\t/* 34px at 13px font-size */\\n\\t--ck-switch-button-toggle-width: 2.6153846154em;\\n\\t/* 14px at 13px font-size */\\n\\t--ck-switch-button-toggle-inner-size: 1.0769230769em;\\n\\t--ck-switch-button-toggle-spacing: 1px;\\n\\t--ck-switch-button-translation: calc(\\n\\t\\tvar(--ck-switch-button-toggle-width) -\\n\\t\\tvar(--ck-switch-button-toggle-inner-size) -\\n\\t\\t2 * var(--ck-switch-button-toggle-spacing)\\n\\t);\\n}\\n\\n.ck.ck-button.ck-switchbutton {\\n\\t& .ck-button__label {\\n\\t\\t@mixin ck-dir ltr {\\n\\t\\t\\t/* Separate the label from the switch */\\n\\t\\t\\tmargin-right: calc(2 * var(--ck-spacing-large));\\n\\t\\t}\\n\\n\\t\\t@mixin ck-dir rtl {\\n\\t\\t\\t/* Separate the label from the switch */\\n\\t\\t\\tmargin-left: calc(2 * var(--ck-spacing-large));\\n\\t\\t}\\n\\t}\\n\\n\\t& .ck-button__toggle {\\n\\t\\t@mixin ck-rounded-corners;\\n\\n\\t\\t@mixin ck-dir ltr {\\n\\t\\t\\t/* Make sure the toggle is always to the right as far as possible. */\\n\\t\\t\\tmargin-left: auto;\\n\\t\\t}\\n\\n\\t\\t@mixin ck-dir rtl {\\n\\t\\t\\t/* Make sure the toggle is always to the left as far as possible. */\\n\\t\\t\\tmargin-right: auto;\\n\\t\\t}\\n\\n\\t\\t/* Gently animate the background color of the toggle switch */\\n\\t\\ttransition: background 400ms ease;\\n\\n\\t\\twidth: var(--ck-switch-button-toggle-width);\\n\\t\\tbackground: var(--ck-color-switch-button-off-background);\\n\\n\\t\\t& .ck-button__toggle__inner {\\n\\t\\t\\t@mixin ck-rounded-corners {\\n\\t\\t\\t\\tborder-radius: calc(.5 * var(--ck-border-radius));\\n\\t\\t\\t}\\n\\n\\t\\t\\t/* Leave some tiny bit of space around the inner part of the switch */\\n\\t\\t\\tmargin: var(--ck-switch-button-toggle-spacing);\\n\\t\\t\\twidth: var(--ck-switch-button-toggle-inner-size);\\n\\t\\t\\theight: var(--ck-switch-button-toggle-inner-size);\\n\\t\\t\\tbackground: var(--ck-color-switch-button-inner-background);\\n\\n\\t\\t\\t/* Gently animate the inner part of the toggle switch */\\n\\t\\t\\ttransition: all 300ms ease;\\n\\t\\t}\\n\\n\\t\\t&:hover {\\n\\t\\t\\tbackground: var(--ck-color-switch-button-off-hover-background);\\n\\n\\t\\t\\t& .ck-button__toggle__inner {\\n\\t\\t\\t\\tbox-shadow: 0 0 0 5px var(--ck-color-switch-button-inner-shadow);\\n\\t\\t\\t}\\n\\t\\t}\\n\\t}\\n\\n\\t&.ck-disabled .ck-button__toggle {\\n\\t\\t@mixin ck-disabled;\\n\\t}\\n\\n\\t&.ck-on .ck-button__toggle {\\n\\t\\tbackground: var(--ck-color-switch-button-on-background);\\n\\n\\t\\t&:hover {\\n\\t\\t\\tbackground: var(--ck-color-switch-button-on-hover-background);\\n\\t\\t}\\n\\n\\t\\t& .ck-button__toggle__inner {\\n\\t\\t\\t/*\\n\\t\\t\\t * Move the toggle switch to the right. It will be animated.\\n\\t\\t\\t */\\n\\t\\t\\t@mixin ck-dir ltr {\\n\\t\\t\\t\\ttransform: translateX( var( --ck-switch-button-translation ) );\\n\\t\\t\\t}\\n\\n\\t\\t\\t@mixin ck-dir rtl {\\n\\t\\t\\t\\ttransform: translateX( calc( -1 * var( --ck-switch-button-translation ) ) );\\n\\t\\t\\t}\\n\\t\\t}\\n\\t}\\n}\\n\",\"/*\\n * Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\\n */\\n\\n/**\\n * Implements rounded corner interface for .ck-rounded-corners class.\\n *\\n * @see $ck-border-radius\\n */\\n@define-mixin ck-rounded-corners {\\n\\tborder-radius: 0;\\n\\n\\t@nest .ck-rounded-corners &,\\n\\t&.ck-rounded-corners {\\n\\t\\tborder-radius: var(--ck-border-radius);\\n\\t\\t@mixin-content;\\n\\t}\\n}\\n\",\"/*\\n * Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\\n */\\n\\n/**\\n * A class which indicates that an element holding it is disabled.\\n */\\n@define-mixin ck-disabled {\\n\\topacity: var(--ck-disabled-opacity);\\n}\\n\"],\"sourceRoot\":\"\"}]);\n// Exports\nexport default ___CSS_LOADER_EXPORT___;\n","// Imports\nimport ___CSS_LOADER_API_SOURCEMAP_IMPORT___ from \"../../../../../css-loader/dist/runtime/cssWithMappingToString.js\";\nimport ___CSS_LOADER_API_IMPORT___ from \"../../../../../css-loader/dist/runtime/api.js\";\nvar ___CSS_LOADER_EXPORT___ = ___CSS_LOADER_API_IMPORT___(___CSS_LOADER_API_SOURCEMAP_IMPORT___);\n// Module\n___CSS_LOADER_EXPORT___.push([module.id, \":root{--ck-toolbar-dropdown-max-width:60vw}.ck.ck-toolbar-dropdown .ck-dropdown__panel{width:max-content;max-width:var(--ck-toolbar-dropdown-max-width)}.ck.ck-toolbar-dropdown .ck-dropdown__panel .ck-button:focus{z-index:calc(var(--ck-z-default) + 1)}.ck.ck-toolbar-dropdown .ck-toolbar{border:0}\", \"\",{\"version\":3,\"sources\":[\"webpack://./node_modules/@ckeditor/ckeditor5-ui/theme/components/dropdown/toolbardropdown.css\",\"webpack://./node_modules/@ckeditor/ckeditor5-theme-lark/theme/ckeditor5-ui/components/dropdown/toolbardropdown.css\"],\"names\":[],\"mappings\":\"AAKA,MACC,oCACD,CAGC,4CAEC,iBAAkB,CAClB,8CAOD,CAJE,6DACC,qCACD,CCbH,oCACC,QACD\",\"sourcesContent\":[\"/*\\n * Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\\n */\\n\\n:root {\\n\\t--ck-toolbar-dropdown-max-width: 60vw;\\n}\\n\\n.ck.ck-toolbar-dropdown {\\n\\t& .ck-dropdown__panel {\\n\\t\\t/* https://github.com/ckeditor/ckeditor5/issues/5586 */\\n\\t\\twidth: max-content;\\n\\t\\tmax-width: var(--ck-toolbar-dropdown-max-width);\\n\\n\\t\\t& .ck-button {\\n\\t\\t\\t&:focus {\\n\\t\\t\\t\\tz-index: calc(var(--ck-z-default) + 1);\\n\\t\\t\\t}\\n\\t\\t}\\n\\t}\\n}\\n\",\"/*\\n * Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\\n */\\n\\n.ck.ck-toolbar-dropdown .ck-toolbar {\\n\\tborder: 0;\\n}\\n\"],\"sourceRoot\":\"\"}]);\n// Exports\nexport default ___CSS_LOADER_EXPORT___;\n","// Imports\nimport ___CSS_LOADER_API_SOURCEMAP_IMPORT___ from \"../../../../../css-loader/dist/runtime/cssWithMappingToString.js\";\nimport ___CSS_LOADER_API_IMPORT___ from \"../../../../../css-loader/dist/runtime/api.js\";\nvar ___CSS_LOADER_EXPORT___ = ___CSS_LOADER_API_IMPORT___(___CSS_LOADER_API_SOURCEMAP_IMPORT___);\n// Module\n___CSS_LOADER_EXPORT___.push([module.id, \".ck.ck-dropdown .ck-dropdown__panel .ck-list{border-radius:0}.ck-rounded-corners .ck.ck-dropdown .ck-dropdown__panel .ck-list,.ck.ck-dropdown .ck-dropdown__panel .ck-list.ck-rounded-corners{border-radius:var(--ck-border-radius);border-top-left-radius:0}.ck.ck-dropdown .ck-dropdown__panel .ck-list .ck-list__item:first-child .ck-button{border-radius:0}.ck-rounded-corners .ck.ck-dropdown .ck-dropdown__panel .ck-list .ck-list__item:first-child .ck-button,.ck.ck-dropdown .ck-dropdown__panel .ck-list .ck-list__item:first-child .ck-button.ck-rounded-corners{border-radius:var(--ck-border-radius);border-top-left-radius:0;border-bottom-left-radius:0;border-bottom-right-radius:0}.ck.ck-dropdown .ck-dropdown__panel .ck-list .ck-list__item:last-child .ck-button{border-radius:0}.ck-rounded-corners .ck.ck-dropdown .ck-dropdown__panel .ck-list .ck-list__item:last-child .ck-button,.ck.ck-dropdown .ck-dropdown__panel .ck-list .ck-list__item:last-child .ck-button.ck-rounded-corners{border-radius:var(--ck-border-radius);border-top-left-radius:0;border-top-right-radius:0}\", \"\",{\"version\":3,\"sources\":[\"webpack://./node_modules/@ckeditor/ckeditor5-theme-lark/theme/ckeditor5-ui/components/dropdown/listdropdown.css\",\"webpack://./node_modules/@ckeditor/ckeditor5-theme-lark/theme/mixins/_rounded.css\"],\"names\":[],\"mappings\":\"AAOA,6CCIC,eDqBD,CAzBA,iICQE,qCAAsC,CDJtC,wBAqBF,CAfE,mFCND,eDYC,CANA,6MCFA,qCAAsC,CDIpC,wBAAyB,CACzB,2BAA4B,CAC5B,4BAEF,CAEA,kFCdD,eDmBC,CALA,2MCVA,qCAAsC,CDYpC,wBAAyB,CACzB,yBAEF\",\"sourcesContent\":[\"/*\\n * Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\\n */\\n\\n@import \\\"../../../mixins/_rounded.css\\\";\\n\\n.ck.ck-dropdown .ck-dropdown__panel .ck-list {\\n\\t/* Disabled radius of top-left border to be consistent with .dropdown__button\\n\\thttps://github.com/ckeditor/ckeditor5/issues/816 */\\n\\t@mixin ck-rounded-corners {\\n\\t\\tborder-top-left-radius: 0;\\n\\t}\\n\\n\\t/* Make sure the button belonging to the first/last child of the list goes well with the\\n\\tborder radius of the entire panel. */\\n\\t& .ck-list__item {\\n\\t\\t&:first-child .ck-button {\\n\\t\\t\\t@mixin ck-rounded-corners {\\n\\t\\t\\t\\tborder-top-left-radius: 0;\\n\\t\\t\\t\\tborder-bottom-left-radius: 0;\\n\\t\\t\\t\\tborder-bottom-right-radius: 0;\\n\\t\\t\\t}\\n\\t\\t}\\n\\n\\t\\t&:last-child .ck-button {\\n\\t\\t\\t@mixin ck-rounded-corners {\\n\\t\\t\\t\\tborder-top-left-radius: 0;\\n\\t\\t\\t\\tborder-top-right-radius: 0;\\n\\t\\t\\t}\\n\\t\\t}\\n\\t}\\n}\\n\",\"/*\\n * Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\\n */\\n\\n/**\\n * Implements rounded corner interface for .ck-rounded-corners class.\\n *\\n * @see $ck-border-radius\\n */\\n@define-mixin ck-rounded-corners {\\n\\tborder-radius: 0;\\n\\n\\t@nest .ck-rounded-corners &,\\n\\t&.ck-rounded-corners {\\n\\t\\tborder-radius: var(--ck-border-radius);\\n\\t\\t@mixin-content;\\n\\t}\\n}\\n\"],\"sourceRoot\":\"\"}]);\n// Exports\nexport default ___CSS_LOADER_EXPORT___;\n","// Imports\nimport ___CSS_LOADER_API_SOURCEMAP_IMPORT___ from \"../../../../../css-loader/dist/runtime/cssWithMappingToString.js\";\nimport ___CSS_LOADER_API_IMPORT___ from \"../../../../../css-loader/dist/runtime/api.js\";\nvar ___CSS_LOADER_EXPORT___ = ___CSS_LOADER_API_IMPORT___(___CSS_LOADER_API_SOURCEMAP_IMPORT___);\n// Module\n___CSS_LOADER_EXPORT___.push([module.id, \".ck.ck-toolbar{-moz-user-select:none;-webkit-user-select:none;-ms-user-select:none;user-select:none;display:flex;flex-flow:row nowrap;align-items:center}.ck.ck-toolbar>.ck-toolbar__items{display:flex;flex-flow:row wrap;align-items:center;flex-grow:1}.ck.ck-toolbar .ck.ck-toolbar__separator{display:inline-block}.ck.ck-toolbar .ck.ck-toolbar__separator:first-child,.ck.ck-toolbar .ck.ck-toolbar__separator:last-child{display:none}.ck.ck-toolbar .ck-toolbar__line-break{flex-basis:100%}.ck.ck-toolbar.ck-toolbar_grouping>.ck-toolbar__items{flex-wrap:nowrap}.ck.ck-toolbar.ck-toolbar_vertical>.ck-toolbar__items{flex-direction:column}.ck.ck-toolbar.ck-toolbar_floating>.ck-toolbar__items{flex-wrap:nowrap}.ck.ck-toolbar>.ck.ck-toolbar__grouped-dropdown>.ck-dropdown__button .ck-dropdown__arrow{display:none}.ck.ck-toolbar{border-radius:0}.ck-rounded-corners .ck.ck-toolbar,.ck.ck-toolbar.ck-rounded-corners{border-radius:var(--ck-border-radius)}.ck.ck-toolbar{background:var(--ck-color-toolbar-background);padding:0 var(--ck-spacing-small);border:1px solid var(--ck-color-toolbar-border)}.ck.ck-toolbar .ck.ck-toolbar__separator{align-self:stretch;width:1px;min-width:1px;background:var(--ck-color-toolbar-border);margin-top:var(--ck-spacing-small);margin-bottom:var(--ck-spacing-small)}.ck.ck-toolbar .ck-toolbar__line-break{height:0}.ck.ck-toolbar>.ck-toolbar__items>:not(.ck-toolbar__line-break){margin-right:var(--ck-spacing-small)}.ck.ck-toolbar>.ck-toolbar__items:empty+.ck.ck-toolbar__separator{display:none}.ck.ck-toolbar>.ck-toolbar__items>:not(.ck-toolbar__line-break),.ck.ck-toolbar>.ck.ck-toolbar__grouped-dropdown{margin-top:var(--ck-spacing-small);margin-bottom:var(--ck-spacing-small)}.ck.ck-toolbar.ck-toolbar_vertical{padding:0}.ck.ck-toolbar.ck-toolbar_vertical>.ck-toolbar__items>.ck{width:100%;margin:0;border-radius:0;border:0}.ck.ck-toolbar.ck-toolbar_compact{padding:0}.ck.ck-toolbar.ck-toolbar_compact>.ck-toolbar__items>*{margin:0}.ck.ck-toolbar.ck-toolbar_compact>.ck-toolbar__items>:not(:first-child):not(:last-child){border-radius:0}.ck.ck-toolbar>.ck.ck-toolbar__grouped-dropdown>.ck.ck-button.ck-dropdown__button{padding-left:var(--ck-spacing-tiny)}.ck-toolbar-container .ck.ck-toolbar{border:0}.ck.ck-toolbar[dir=rtl]>.ck-toolbar__items>.ck,[dir=rtl] .ck.ck-toolbar>.ck-toolbar__items>.ck{margin-right:0}.ck.ck-toolbar[dir=rtl]:not(.ck-toolbar_compact)>.ck-toolbar__items>.ck,[dir=rtl] .ck.ck-toolbar:not(.ck-toolbar_compact)>.ck-toolbar__items>.ck{margin-left:var(--ck-spacing-small)}.ck.ck-toolbar[dir=rtl]>.ck-toolbar__items>.ck:last-child,[dir=rtl] .ck.ck-toolbar>.ck-toolbar__items>.ck:last-child{margin-left:0}.ck.ck-toolbar[dir=rtl].ck-toolbar_compact>.ck-toolbar__items>.ck:first-child,[dir=rtl] .ck.ck-toolbar.ck-toolbar_compact>.ck-toolbar__items>.ck:first-child{border-top-left-radius:0;border-bottom-left-radius:0}.ck.ck-toolbar[dir=rtl].ck-toolbar_compact>.ck-toolbar__items>.ck:last-child,[dir=rtl] .ck.ck-toolbar.ck-toolbar_compact>.ck-toolbar__items>.ck:last-child{border-top-right-radius:0;border-bottom-right-radius:0}.ck.ck-toolbar[dir=rtl]>.ck.ck-toolbar__separator,[dir=rtl] .ck.ck-toolbar>.ck.ck-toolbar__separator{margin-left:var(--ck-spacing-small)}.ck.ck-toolbar[dir=rtl].ck-toolbar_grouping>.ck-toolbar__items:not(:empty):not(:only-child),[dir=rtl] .ck.ck-toolbar.ck-toolbar_grouping>.ck-toolbar__items:not(:empty):not(:only-child){margin-left:var(--ck-spacing-small)}.ck.ck-toolbar[dir=ltr]>.ck-toolbar__items>.ck:last-child,[dir=ltr] .ck.ck-toolbar>.ck-toolbar__items>.ck:last-child{margin-right:0}.ck.ck-toolbar[dir=ltr].ck-toolbar_compact>.ck-toolbar__items>.ck:first-child,[dir=ltr] .ck.ck-toolbar.ck-toolbar_compact>.ck-toolbar__items>.ck:first-child{border-top-right-radius:0;border-bottom-right-radius:0}.ck.ck-toolbar[dir=ltr].ck-toolbar_compact>.ck-toolbar__items>.ck:last-child,[dir=ltr] .ck.ck-toolbar.ck-toolbar_compact>.ck-toolbar__items>.ck:last-child{border-top-left-radius:0;border-bottom-left-radius:0}.ck.ck-toolbar[dir=ltr]>.ck.ck-toolbar__separator,[dir=ltr] .ck.ck-toolbar>.ck.ck-toolbar__separator{margin-right:var(--ck-spacing-small)}.ck.ck-toolbar[dir=ltr].ck-toolbar_grouping>.ck-toolbar__items:not(:empty):not(:only-child),[dir=ltr] .ck.ck-toolbar.ck-toolbar_grouping>.ck-toolbar__items:not(:empty):not(:only-child){margin-right:var(--ck-spacing-small)}\", \"\",{\"version\":3,\"sources\":[\"webpack://./node_modules/@ckeditor/ckeditor5-ui/theme/components/toolbar/toolbar.css\",\"webpack://./node_modules/@ckeditor/ckeditor5-ui/theme/mixins/_unselectable.css\",\"webpack://./node_modules/@ckeditor/ckeditor5-theme-lark/theme/ckeditor5-ui/components/toolbar/toolbar.css\",\"webpack://./node_modules/@ckeditor/ckeditor5-theme-lark/theme/mixins/_rounded.css\"],\"names\":[],\"mappings\":\"AAOA,eCEC,qBAAsB,CACtB,wBAAyB,CACzB,oBAAqB,CACrB,gBAAgB,CDFhB,YAAa,CACb,oBAAqB,CACrB,kBA6CD,CA3CC,kCACC,YAAa,CACb,kBAAmB,CACnB,kBAAmB,CACnB,WAED,CAEA,yCACC,oBAWD,CAJC,yGAEC,YACD,CAGD,uCACC,eACD,CAEA,sDACC,gBACD,CAEA,sDACC,qBACD,CAEA,sDACC,gBACD,CAGC,yFACC,YACD,CE/CF,eCGC,eD0FD,CA7FA,qECOE,qCDsFF,CA7FA,eAGC,6CAA8C,CAC9C,iCAAkC,CAClC,+CAwFD,CAtFC,yCACC,kBAAmB,CACnB,SAAU,CACV,aAAc,CACd,yCAA0C,CAM1C,kCAAmC,CACnC,qCACD,CAEA,uCACC,QACD,CAGC,gEAEC,oCACD,CAIA,kEACC,YACD,CAGD,gHAGC,kCAAmC,CACnC,qCACD,CAEA,mCAEC,SAgBD,CAbC,0DAEC,UAAW,CAGX,QAAS,CAGT,eAAgB,CAGhB,QACD,CAGD,kCAEC,SAWD,CATC,uDAEC,QAMD,CAHC,yFACC,eACD,CASD,kFACC,mCACD,CAvFF,qCA2FE,QAEF,CAYC,+FACC,cACD,CAEA,iJAEC,mCACD,CAEA,qHACC,aACD,CAIC,6JACC,wBAAyB,CACzB,2BACD,CAGA,2JACC,yBAA0B,CAC1B,4BACD,CAID,qGACC,mCACD,CAGA,yLACC,mCACD,CAWA,qHACC,cACD,CAIC,6JACC,yBAA0B,CAC1B,4BACD,CAGA,2JACC,wBAAyB,CACzB,2BACD,CAID,qGACC,oCACD,CAGA,yLACC,oCACD\",\"sourcesContent\":[\"/*\\n * Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\\n */\\n\\n@import \\\"../../mixins/_unselectable.css\\\";\\n\\n.ck.ck-toolbar {\\n\\t@mixin ck-unselectable;\\n\\n\\tdisplay: flex;\\n\\tflex-flow: row nowrap;\\n\\talign-items: center;\\n\\n\\t& > .ck-toolbar__items {\\n\\t\\tdisplay: flex;\\n\\t\\tflex-flow: row wrap;\\n\\t\\talign-items: center;\\n\\t\\tflex-grow: 1;\\n\\n\\t}\\n\\n\\t& .ck.ck-toolbar__separator {\\n\\t\\tdisplay: inline-block;\\n\\n\\t\\t/*\\n\\t\\t * A leading or trailing separator makes no sense (separates from nothing on one side).\\n\\t\\t * For instance, it can happen when toolbar items (also separators) are getting grouped one by one and\\n\\t\\t * moved to another toolbar in the dropdown.\\n\\t\\t */\\n\\t\\t&:first-child,\\n\\t\\t&:last-child {\\n\\t\\t\\tdisplay: none;\\n\\t\\t}\\n\\t}\\n\\n\\t& .ck-toolbar__line-break {\\n\\t\\tflex-basis: 100%;\\n\\t}\\n\\n\\t&.ck-toolbar_grouping > .ck-toolbar__items {\\n\\t\\tflex-wrap: nowrap;\\n\\t}\\n\\n\\t&.ck-toolbar_vertical > .ck-toolbar__items {\\n\\t\\tflex-direction: column;\\n\\t}\\n\\n\\t&.ck-toolbar_floating > .ck-toolbar__items {\\n\\t\\tflex-wrap: nowrap;\\n\\t}\\n\\n\\t& > .ck.ck-toolbar__grouped-dropdown {\\n\\t\\t& > .ck-dropdown__button .ck-dropdown__arrow {\\n\\t\\t\\tdisplay: none;\\n\\t\\t}\\n\\t}\\n}\\n\",\"/*\\n * Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\\n */\\n\\n/**\\n * Makes element unselectable.\\n */\\n@define-mixin ck-unselectable {\\n\\t-moz-user-select: none;\\n\\t-webkit-user-select: none;\\n\\t-ms-user-select: none;\\n\\tuser-select: none\\n}\\n\",\"/*\\n * Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\\n */\\n\\n@import \\\"../../../mixins/_rounded.css\\\";\\n@import \\\"@ckeditor/ckeditor5-ui/theme/mixins/_dir.css\\\";\\n\\n.ck.ck-toolbar {\\n\\t@mixin ck-rounded-corners;\\n\\n\\tbackground: var(--ck-color-toolbar-background);\\n\\tpadding: 0 var(--ck-spacing-small);\\n\\tborder: 1px solid var(--ck-color-toolbar-border);\\n\\n\\t& .ck.ck-toolbar__separator {\\n\\t\\talign-self: stretch;\\n\\t\\twidth: 1px;\\n\\t\\tmin-width: 1px;\\n\\t\\tbackground: var(--ck-color-toolbar-border);\\n\\n\\t\\t/*\\n\\t\\t * These margins make the separators look better in balloon toolbars (when aligned with the \\\"tip\\\").\\n\\t\\t * See https://github.com/ckeditor/ckeditor5/issues/7493.\\n\\t\\t */\\n\\t\\tmargin-top: var(--ck-spacing-small);\\n\\t\\tmargin-bottom: var(--ck-spacing-small);\\n\\t}\\n\\n\\t& .ck-toolbar__line-break {\\n\\t\\theight: 0;\\n\\t}\\n\\n\\t& > .ck-toolbar__items {\\n\\t\\t& > *:not(.ck-toolbar__line-break) {\\n\\t\\t\\t/* (#11) Separate toolbar items. */\\n\\t\\t\\tmargin-right: var(--ck-spacing-small);\\n\\t\\t}\\n\\n\\t\\t/* Don't display a separator after an empty items container, for instance,\\n\\t\\twhen all items were grouped */\\n\\t\\t&:empty + .ck.ck-toolbar__separator {\\n\\t\\t\\tdisplay: none;\\n\\t\\t}\\n\\t}\\n\\n\\t& > .ck-toolbar__items > *:not(.ck-toolbar__line-break),\\n\\t& > .ck.ck-toolbar__grouped-dropdown {\\n\\t\\t/* Make sure items wrapped to the next line have v-spacing */\\n\\t\\tmargin-top: var(--ck-spacing-small);\\n\\t\\tmargin-bottom: var(--ck-spacing-small);\\n\\t}\\n\\n\\t&.ck-toolbar_vertical {\\n\\t\\t/* Items in a vertical toolbar span the entire width. */\\n\\t\\tpadding: 0;\\n\\n\\t\\t/* Specificity matters here. See https://github.com/ckeditor/ckeditor5-theme-lark/issues/168. */\\n\\t\\t& > .ck-toolbar__items > .ck {\\n\\t\\t\\t/* Items in a vertical toolbar should span the horizontal space. */\\n\\t\\t\\twidth: 100%;\\n\\n\\t\\t\\t/* Items in a vertical toolbar should have no margin. */\\n\\t\\t\\tmargin: 0;\\n\\n\\t\\t\\t/* Items in a vertical toolbar span the entire width so rounded corners are pointless. */\\n\\t\\t\\tborder-radius: 0;\\n\\n\\t\\t\\t/* Items in a vertical toolbar span the entire width so any border is pointless. */\\n\\t\\t\\tborder: 0;\\n\\t\\t}\\n\\t}\\n\\n\\t&.ck-toolbar_compact {\\n\\t\\t/* No spacing around items. */\\n\\t\\tpadding: 0;\\n\\n\\t\\t& > .ck-toolbar__items > * {\\n\\t\\t\\t/* Compact toolbar items have no spacing between them. */\\n\\t\\t\\tmargin: 0;\\n\\n\\t\\t\\t/* \\\"Middle\\\" children should have no rounded corners. */\\n\\t\\t\\t&:not(:first-child):not(:last-child) {\\n\\t\\t\\t\\tborder-radius: 0;\\n\\t\\t\\t}\\n\\t\\t}\\n\\t}\\n\\n\\t& > .ck.ck-toolbar__grouped-dropdown {\\n\\t\\t/*\\n\\t\\t * Dropdown button has asymmetric padding to fit the arrow.\\n\\t\\t * This button has no arrow so let's revert that padding back to normal.\\n\\t\\t */\\n\\t\\t& > .ck.ck-button.ck-dropdown__button {\\n\\t\\t\\tpadding-left: var(--ck-spacing-tiny);\\n\\t\\t}\\n\\t}\\n\\n\\t@nest .ck-toolbar-container & {\\n\\t\\tborder: 0;\\n\\t}\\n}\\n\\n/* stylelint-disable */\\n\\n/*\\n * Styles for RTL toolbars.\\n *\\n * Note: In some cases (e.g. a decoupled editor), the toolbar has its own \\\"dir\\\"\\n * because its parent is not controlled by the editor framework.\\n */\\n[dir=\\\"rtl\\\"] .ck.ck-toolbar,\\n.ck.ck-toolbar[dir=\\\"rtl\\\"] {\\n\\t& > .ck-toolbar__items > .ck {\\n\\t\\tmargin-right: 0;\\n\\t}\\n\\n\\t&:not(.ck-toolbar_compact) > .ck-toolbar__items > .ck {\\n\\t\\t/* (#11) Separate toolbar items. */\\n\\t\\tmargin-left: var(--ck-spacing-small);\\n\\t}\\n\\n\\t& > .ck-toolbar__items > .ck:last-child {\\n\\t\\tmargin-left: 0;\\n\\t}\\n\\n\\t&.ck-toolbar_compact > .ck-toolbar__items > .ck {\\n\\t\\t/* No rounded corners on the right side of the first child. */\\n\\t\\t&:first-child {\\n\\t\\t\\tborder-top-left-radius: 0;\\n\\t\\t\\tborder-bottom-left-radius: 0;\\n\\t\\t}\\n\\n\\t\\t/* No rounded corners on the left side of the last child. */\\n\\t\\t&:last-child {\\n\\t\\t\\tborder-top-right-radius: 0;\\n\\t\\t\\tborder-bottom-right-radius: 0;\\n\\t\\t}\\n\\t}\\n\\n\\t/* Separate the the separator form the grouping dropdown when some items are grouped. */\\n\\t& > .ck.ck-toolbar__separator {\\n\\t\\tmargin-left: var(--ck-spacing-small);\\n\\t}\\n\\n\\t/* Some spacing between the items and the separator before the grouped items dropdown. */\\n\\t&.ck-toolbar_grouping > .ck-toolbar__items:not(:empty):not(:only-child) {\\n\\t\\tmargin-left: var(--ck-spacing-small);\\n\\t}\\n}\\n\\n/*\\n * Styles for LTR toolbars.\\n *\\n * Note: In some cases (e.g. a decoupled editor), the toolbar has its own \\\"dir\\\"\\n * because its parent is not controlled by the editor framework.\\n */\\n[dir=\\\"ltr\\\"] .ck.ck-toolbar,\\n.ck.ck-toolbar[dir=\\\"ltr\\\"] {\\n\\t& > .ck-toolbar__items > .ck:last-child {\\n\\t\\tmargin-right: 0;\\n\\t}\\n\\n\\t&.ck-toolbar_compact > .ck-toolbar__items > .ck {\\n\\t\\t/* No rounded corners on the right side of the first child. */\\n\\t\\t&:first-child {\\n\\t\\t\\tborder-top-right-radius: 0;\\n\\t\\t\\tborder-bottom-right-radius: 0;\\n\\t\\t}\\n\\n\\t\\t/* No rounded corners on the left side of the last child. */\\n\\t\\t&:last-child {\\n\\t\\t\\tborder-top-left-radius: 0;\\n\\t\\t\\tborder-bottom-left-radius: 0;\\n\\t\\t}\\n\\t}\\n\\n\\t/* Separate the the separator form the grouping dropdown when some items are grouped. */\\n\\t& > .ck.ck-toolbar__separator {\\n\\t\\tmargin-right: var(--ck-spacing-small);\\n\\t}\\n\\n\\t/* Some spacing between the items and the separator before the grouped items dropdown. */\\n\\t&.ck-toolbar_grouping > .ck-toolbar__items:not(:empty):not(:only-child) {\\n\\t\\tmargin-right: var(--ck-spacing-small);\\n\\t}\\n}\\n\\n/* stylelint-enable */\\n\",\"/*\\n * Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\\n */\\n\\n/**\\n * Implements rounded corner interface for .ck-rounded-corners class.\\n *\\n * @see $ck-border-radius\\n */\\n@define-mixin ck-rounded-corners {\\n\\tborder-radius: 0;\\n\\n\\t@nest .ck-rounded-corners &,\\n\\t&.ck-rounded-corners {\\n\\t\\tborder-radius: var(--ck-border-radius);\\n\\t\\t@mixin-content;\\n\\t}\\n}\\n\"],\"sourceRoot\":\"\"}]);\n// Exports\nexport default ___CSS_LOADER_EXPORT___;\n","// Imports\nimport ___CSS_LOADER_API_SOURCEMAP_IMPORT___ from \"../../../css-loader/dist/runtime/cssWithMappingToString.js\";\nimport ___CSS_LOADER_API_IMPORT___ from \"../../../css-loader/dist/runtime/api.js\";\nvar ___CSS_LOADER_EXPORT___ = ___CSS_LOADER_API_IMPORT___(___CSS_LOADER_API_SOURCEMAP_IMPORT___);\n// Module\n___CSS_LOADER_EXPORT___.push([module.id, \".ck.ck-editor{position:relative}.ck.ck-editor .ck-editor__top .ck-sticky-panel .ck-toolbar{z-index:var(--ck-z-modal)}.ck.ck-editor__top .ck-sticky-panel .ck-toolbar{border-radius:0}.ck-rounded-corners .ck.ck-editor__top .ck-sticky-panel .ck-toolbar,.ck.ck-editor__top .ck-sticky-panel .ck-toolbar.ck-rounded-corners{border-radius:var(--ck-border-radius);border-bottom-left-radius:0;border-bottom-right-radius:0}.ck.ck-editor__top .ck-sticky-panel .ck-toolbar{border-bottom-width:0}.ck.ck-editor__top .ck-sticky-panel .ck-sticky-panel__content_sticky .ck-toolbar{border-bottom-width:1px;border-radius:0}.ck-rounded-corners .ck.ck-editor__top .ck-sticky-panel .ck-sticky-panel__content_sticky .ck-toolbar,.ck.ck-editor__top .ck-sticky-panel .ck-sticky-panel__content_sticky .ck-toolbar.ck-rounded-corners{border-radius:var(--ck-border-radius);border-radius:0}.ck.ck-editor__main>.ck-editor__editable{background:var(--ck-color-base-background);border-radius:0}.ck-rounded-corners .ck.ck-editor__main>.ck-editor__editable,.ck.ck-editor__main>.ck-editor__editable.ck-rounded-corners{border-radius:var(--ck-border-radius);border-top-left-radius:0;border-top-right-radius:0}.ck.ck-editor__main>.ck-editor__editable:not(.ck-focused){border-color:var(--ck-color-base-border)}\", \"\",{\"version\":3,\"sources\":[\"webpack://./node_modules/@ckeditor/ckeditor5-editor-classic/theme/classiceditor.css\",\"webpack://./node_modules/@ckeditor/ckeditor5-theme-lark/theme/ckeditor5-editor-classic/classiceditor.css\",\"webpack://./node_modules/@ckeditor/ckeditor5-theme-lark/theme/mixins/_rounded.css\"],\"names\":[],\"mappings\":\"AAKA,cAIC,iBAMD,CAJC,2DAEC,yBACD,CCLC,gDCED,eDKC,CAPA,uICMA,qCAAsC,CDJpC,2BAA4B,CAC5B,4BAIF,CAPA,gDAMC,qBACD,CAEA,iFACC,uBAAwB,CCR1B,eDaC,CANA,yMCHA,qCAAsC,CDOpC,eAEF,CAKF,yCAEC,0CAA2C,CCpB3C,eD8BD,CAZA,yHCdE,qCAAsC,CDmBtC,wBAAyB,CACzB,yBAMF,CAHC,0DACC,wCACD\",\"sourcesContent\":[\"/*\\n * Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\\n */\\n\\n.ck.ck-editor {\\n\\t/* All the elements within `.ck-editor` are positioned relatively to it.\\n\\t If any element needs to be positioned with respect to the <body>, etc.,\\n\\t it must land outside of the `.ck-editor` in DOM. */\\n\\tposition: relative;\\n\\n\\t& .ck-editor__top .ck-sticky-panel .ck-toolbar {\\n\\t\\t/* https://github.com/ckeditor/ckeditor5-editor-classic/issues/62 */\\n\\t\\tz-index: var(--ck-z-modal);\\n\\t}\\n}\\n\",\"/*\\n * Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\\n */\\n\\n@import \\\"../mixins/_rounded.css\\\";\\n\\n.ck.ck-editor__top {\\n\\t& .ck-sticky-panel {\\n\\t\\t& .ck-toolbar {\\n\\t\\t\\t@mixin ck-rounded-corners {\\n\\t\\t\\t\\tborder-bottom-left-radius: 0;\\n\\t\\t\\t\\tborder-bottom-right-radius: 0;\\n\\t\\t\\t}\\n\\n\\t\\t\\tborder-bottom-width: 0;\\n\\t\\t}\\n\\n\\t\\t& .ck-sticky-panel__content_sticky .ck-toolbar {\\n\\t\\t\\tborder-bottom-width: 1px;\\n\\n\\t\\t\\t@mixin ck-rounded-corners {\\n\\t\\t\\t\\tborder-radius: 0;\\n\\t\\t\\t}\\n\\t\\t}\\n\\t}\\n}\\n\\n/* Note: Use ck-editor__main to make sure these styles don't apply to other editor types */\\n.ck.ck-editor__main > .ck-editor__editable {\\n\\t/* https://github.com/ckeditor/ckeditor5-theme-lark/issues/113 */\\n\\tbackground: var(--ck-color-base-background);\\n\\n\\t@mixin ck-rounded-corners {\\n\\t\\tborder-top-left-radius: 0;\\n\\t\\tborder-top-right-radius: 0;\\n\\t}\\n\\n\\t&:not(.ck-focused) {\\n\\t\\tborder-color: var(--ck-color-base-border);\\n\\t}\\n}\\n\",\"/*\\n * Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\\n */\\n\\n/**\\n * Implements rounded corner interface for .ck-rounded-corners class.\\n *\\n * @see $ck-border-radius\\n */\\n@define-mixin ck-rounded-corners {\\n\\tborder-radius: 0;\\n\\n\\t@nest .ck-rounded-corners &,\\n\\t&.ck-rounded-corners {\\n\\t\\tborder-radius: var(--ck-border-radius);\\n\\t\\t@mixin-content;\\n\\t}\\n}\\n\"],\"sourceRoot\":\"\"}]);\n// Exports\nexport default ___CSS_LOADER_EXPORT___;\n","// Imports\nimport ___CSS_LOADER_API_SOURCEMAP_IMPORT___ from \"../../../../../css-loader/dist/runtime/cssWithMappingToString.js\";\nimport ___CSS_LOADER_API_IMPORT___ from \"../../../../../css-loader/dist/runtime/api.js\";\nvar ___CSS_LOADER_EXPORT___ = ___CSS_LOADER_API_IMPORT___(___CSS_LOADER_API_SOURCEMAP_IMPORT___);\n// Module\n___CSS_LOADER_EXPORT___.push([module.id, \".ck.ck-splitbutton{font-size:inherit}.ck.ck-splitbutton .ck-splitbutton__action:focus{z-index:calc(var(--ck-z-default) + 1)}.ck.ck-splitbutton.ck-splitbutton_open>.ck-button .ck-tooltip{display:none}:root{--ck-color-split-button-hover-background:#ebebeb;--ck-color-split-button-hover-border:#b3b3b3}[dir=ltr] .ck.ck-splitbutton>.ck-splitbutton__action{border-top-right-radius:unset;border-bottom-right-radius:unset}[dir=rtl] .ck.ck-splitbutton>.ck-splitbutton__action{border-top-left-radius:unset;border-bottom-left-radius:unset}.ck.ck-splitbutton>.ck-splitbutton__arrow{min-width:unset}[dir=ltr] .ck.ck-splitbutton>.ck-splitbutton__arrow{border-radius:0}.ck-rounded-corners [dir=ltr] .ck.ck-splitbutton>.ck-splitbutton__arrow,[dir=ltr] .ck.ck-splitbutton>.ck-splitbutton__arrow.ck-rounded-corners{border-radius:var(--ck-border-radius);border-top-left-radius:unset;border-bottom-left-radius:unset}[dir=rtl] .ck.ck-splitbutton>.ck-splitbutton__arrow{border-top-right-radius:unset;border-bottom-right-radius:unset}.ck.ck-splitbutton>.ck-splitbutton__arrow svg{width:var(--ck-dropdown-arrow-size)}.ck.ck-splitbutton.ck-splitbutton_open>.ck-button:not(.ck-on):not(.ck-disabled):not(:hover),.ck.ck-splitbutton:hover>.ck-button:not(.ck-on):not(.ck-disabled):not(:hover){background:var(--ck-color-split-button-hover-background)}[dir=ltr] .ck.ck-splitbutton.ck-splitbutton_open>.ck-splitbutton__arrow:not(.ck-disabled),[dir=ltr] .ck.ck-splitbutton:hover>.ck-splitbutton__arrow:not(.ck-disabled){border-left-color:var(--ck-color-split-button-hover-border)}[dir=rtl] .ck.ck-splitbutton.ck-splitbutton_open>.ck-splitbutton__arrow:not(.ck-disabled),[dir=rtl] .ck.ck-splitbutton:hover>.ck-splitbutton__arrow:not(.ck-disabled){border-right-color:var(--ck-color-split-button-hover-border)}.ck.ck-splitbutton.ck-splitbutton_open{border-radius:0}.ck-rounded-corners .ck.ck-splitbutton.ck-splitbutton_open,.ck.ck-splitbutton.ck-splitbutton_open.ck-rounded-corners{border-radius:var(--ck-border-radius)}.ck-rounded-corners .ck.ck-splitbutton.ck-splitbutton_open>.ck-splitbutton__action,.ck.ck-splitbutton.ck-splitbutton_open.ck-rounded-corners>.ck-splitbutton__action{border-bottom-left-radius:0}.ck-rounded-corners .ck.ck-splitbutton.ck-splitbutton_open>.ck-splitbutton__arrow,.ck.ck-splitbutton.ck-splitbutton_open.ck-rounded-corners>.ck-splitbutton__arrow{border-bottom-right-radius:0}\", \"\",{\"version\":3,\"sources\":[\"webpack://./node_modules/@ckeditor/ckeditor5-ui/theme/components/dropdown/splitbutton.css\",\"webpack://./node_modules/@ckeditor/ckeditor5-ui/theme/components/tooltip/mixins/_tooltip.css\",\"webpack://./node_modules/@ckeditor/ckeditor5-theme-lark/theme/ckeditor5-ui/components/dropdown/splitbutton.css\",\"webpack://./node_modules/@ckeditor/ckeditor5-theme-lark/theme/mixins/_rounded.css\"],\"names\":[],\"mappings\":\"AAOA,mBAEC,iBAUD,CARC,iDACC,qCACD,CC0BA,8DACC,YACD,CClCD,MACC,gDAAyD,CACzD,4CACD,CAMC,qDAGE,6BAA8B,CAC9B,gCAQF,CAZA,qDASE,4BAA6B,CAC7B,+BAEF,CAEA,0CAGC,eAmBD,CAtBA,oDCnBA,eDyCA,CAtBA,+ICfC,qCAAsC,CDuBpC,4BAA6B,CAC7B,+BAaH,CAtBA,oDAeE,6BAA8B,CAC9B,gCAMF,CAHC,8CACC,mCACD,CASA,0KACC,wDACD,CAGC,sKACC,2DACD,CAIA,sKACC,4DACD,CAMF,uCCpEA,eD8EA,CAVA,qHChEC,qCD0ED,CARE,qKACC,2BACD,CAEA,mKACC,4BACD\",\"sourcesContent\":[\"/*\\n * Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\\n */\\n\\n@import \\\"../tooltip/mixins/_tooltip.css\\\";\\n\\n.ck.ck-splitbutton {\\n\\t/* Enable font size inheritance, which allows fluid UI scaling. */\\n\\tfont-size: inherit;\\n\\n\\t& .ck-splitbutton__action:focus {\\n\\t\\tz-index: calc(var(--ck-z-default) + 1);\\n\\t}\\n\\n\\t/* Disable tooltips for the buttons when the button is \\\"open\\\" */\\n\\t&.ck-splitbutton_open > .ck-button {\\n\\t\\t@mixin ck-tooltip_disabled;\\n\\t}\\n}\\n\\n\",\"/*\\n * Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\\n */\\n\\n/**\\n * Enables the tooltip, which is the tooltip is in DOM but\\n * not yet displayed.\\n */\\n@define-mixin ck-tooltip_enabled {\\n\\t& .ck-tooltip {\\n\\t\\tdisplay: block;\\n\\n\\t\\t/*\\n\\t\\t * Don't display tooltips in devices which don't support :hover.\\n\\t\\t * In fact, it's all about iOS, which forces user to click UI elements twice to execute\\n\\t\\t * the primary action, when tooltips are enabled.\\n\\t\\t *\\n\\t\\t * Q: OK, but why not the following query?\\n\\t\\t *\\n\\t\\t *   @media (hover) {\\n\\t\\t *       display: block;\\n\\t\\t *   }\\n\\t\\t *\\n\\t\\t * A: Because FF does not support it and it would completely disable tooltips\\n\\t\\t * in that browser.\\n\\t\\t *\\n\\t\\t * More in https://github.com/ckeditor/ckeditor5/issues/920.\\n\\t\\t */\\n\\t\\t@media (hover:none) {\\n\\t\\t\\tdisplay: none;\\n\\t\\t}\\n\\t}\\n}\\n\\n/**\\n * Disables the tooltip making it disappear from DOM.\\n */\\n@define-mixin ck-tooltip_disabled {\\n\\t& .ck-tooltip {\\n\\t\\tdisplay: none;\\n\\t}\\n}\\n\\n/**\\n * Shows the tooltip, which is already in DOM.\\n * Requires `ck-tooltip_enabled` first.\\n */\\n@define-mixin ck-tooltip_visible {\\n\\t& .ck-tooltip {\\n\\t\\tvisibility: visible;\\n\\t\\topacity: 1;\\n\\t}\\n}\\n\",\"/*\\n * Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\\n */\\n\\n@import \\\"../../../mixins/_rounded.css\\\";\\n\\n:root {\\n\\t--ck-color-split-button-hover-background: hsl(0, 0%, 92%);\\n\\t--ck-color-split-button-hover-border: hsl(0, 0%, 70%);\\n}\\n\\n.ck.ck-splitbutton {\\n\\t/*\\n\\t * Note: ck-rounded and ck-dir mixins don't go together (because they both use @nest).\\n\\t */\\n\\t& > .ck-splitbutton__action {\\n\\t\\t@nest [dir=\\\"ltr\\\"] & {\\n\\t\\t\\t/* Don't round the action button on the right side */\\n\\t\\t\\tborder-top-right-radius: unset;\\n\\t\\t\\tborder-bottom-right-radius: unset;\\n\\t\\t}\\n\\n\\t\\t@nest [dir=\\\"rtl\\\"] & {\\n\\t\\t\\t/* Don't round the action button on the left side */\\n\\t\\t\\tborder-top-left-radius: unset;\\n\\t\\t\\tborder-bottom-left-radius: unset;\\n\\t\\t}\\n\\t}\\n\\n\\t& > .ck-splitbutton__arrow {\\n\\t\\t/* It's a text-less button and since the icon is positioned absolutely in such situation,\\n\\t\\tit must get some arbitrary min-width. */\\n\\t\\tmin-width: unset;\\n\\n\\t\\t@nest [dir=\\\"ltr\\\"] & {\\n\\t\\t\\t/* Don't round the arrow button on the left side */\\n\\t\\t\\t@mixin ck-rounded-corners {\\n\\t\\t\\t\\tborder-top-left-radius: unset;\\n\\t\\t\\t\\tborder-bottom-left-radius: unset;\\n\\t\\t\\t}\\n\\t\\t}\\n\\n\\t\\t@nest [dir=\\\"rtl\\\"] & {\\n\\t\\t\\t/* Don't round the arrow button on the right side */\\n\\t\\t\\tborder-top-right-radius: unset;\\n\\t\\t\\tborder-bottom-right-radius: unset;\\n\\t\\t}\\n\\n\\t\\t& svg {\\n\\t\\t\\twidth: var(--ck-dropdown-arrow-size);\\n\\t\\t}\\n\\t}\\n\\n\\t/* When the split button is \\\"open\\\" (the arrow is on) or being hovered, it should get some styling\\n\\tas a whole. The background of both buttons should stand out and there should be a visual\\n\\tseparation between both buttons. */\\n\\t&.ck-splitbutton_open,\\n\\t&:hover {\\n\\t\\t/* When the split button hovered as a whole, not as individual buttons. */\\n\\t\\t& > .ck-button:not(.ck-on):not(.ck-disabled):not(:hover) {\\n\\t\\t\\tbackground: var(--ck-color-split-button-hover-background);\\n\\t\\t}\\n\\n\\t\\t@nest [dir=\\\"ltr\\\"] & {\\n\\t\\t\\t& > .ck-splitbutton__arrow:not(.ck-disabled) {\\n\\t\\t\\t\\tborder-left-color: var(--ck-color-split-button-hover-border);\\n\\t\\t\\t}\\n\\t\\t}\\n\\n\\t\\t@nest [dir=\\\"rtl\\\"] & {\\n\\t\\t\\t& > .ck-splitbutton__arrow:not(.ck-disabled) {\\n\\t\\t\\t\\tborder-right-color: var(--ck-color-split-button-hover-border);\\n\\t\\t\\t}\\n\\t\\t}\\n\\t}\\n\\n\\t/* Don't round the bottom left and right corners of the buttons when \\\"open\\\"\\n\\thttps://github.com/ckeditor/ckeditor5/issues/816 */\\n\\t&.ck-splitbutton_open {\\n\\t\\t@mixin ck-rounded-corners {\\n\\t\\t\\t& > .ck-splitbutton__action {\\n\\t\\t\\t\\tborder-bottom-left-radius: 0;\\n\\t\\t\\t}\\n\\n\\t\\t\\t& > .ck-splitbutton__arrow {\\n\\t\\t\\t\\tborder-bottom-right-radius: 0;\\n\\t\\t\\t}\\n\\t\\t}\\n\\t}\\n}\\n\",\"/*\\n * Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\\n */\\n\\n/**\\n * Implements rounded corner interface for .ck-rounded-corners class.\\n *\\n * @see $ck-border-radius\\n */\\n@define-mixin ck-rounded-corners {\\n\\tborder-radius: 0;\\n\\n\\t@nest .ck-rounded-corners &,\\n\\t&.ck-rounded-corners {\\n\\t\\tborder-radius: var(--ck-border-radius);\\n\\t\\t@mixin-content;\\n\\t}\\n}\\n\"],\"sourceRoot\":\"\"}]);\n// Exports\nexport default ___CSS_LOADER_EXPORT___;\n","// Imports\nimport ___CSS_LOADER_API_SOURCEMAP_IMPORT___ from \"../../../css-loader/dist/runtime/cssWithMappingToString.js\";\nimport ___CSS_LOADER_API_IMPORT___ from \"../../../css-loader/dist/runtime/api.js\";\nvar ___CSS_LOADER_EXPORT___ = ___CSS_LOADER_API_IMPORT___(___CSS_LOADER_API_SOURCEMAP_IMPORT___);\n// Module\n___CSS_LOADER_EXPORT___.push([module.id, \":root{--ck-highlight-marker-yellow:#fdfd77;--ck-highlight-marker-green:#62f962;--ck-highlight-marker-pink:#fc7899;--ck-highlight-marker-blue:#72ccfd;--ck-highlight-pen-red:#e71313;--ck-highlight-pen-green:#128a00}.ck-content .marker-yellow{background-color:var(--ck-highlight-marker-yellow)}.ck-content .marker-green{background-color:var(--ck-highlight-marker-green)}.ck-content .marker-pink{background-color:var(--ck-highlight-marker-pink)}.ck-content .marker-blue{background-color:var(--ck-highlight-marker-blue)}.ck-content .pen-red{color:var(--ck-highlight-pen-red);background-color:transparent}.ck-content .pen-green{color:var(--ck-highlight-pen-green);background-color:transparent}\", \"\",{\"version\":3,\"sources\":[\"webpack://./node_modules/@ckeditor/ckeditor5-highlight/theme/highlight.css\"],\"names\":[],\"mappings\":\"AAKA,MACC,oCAA+C,CAC/C,mCAA+C,CAC/C,kCAA8C,CAC9C,kCAA8C,CAC9C,8BAAwC,CACxC,gCACD,CAGC,2BACC,kDACD,CAFA,0BACC,iDACD,CAFA,yBACC,gDACD,CAFA,yBACC,gDACD,CAIA,qBACC,iCAAqC,CAGrC,4BACD,CALA,uBACC,mCAAqC,CAGrC,4BACD\",\"sourcesContent\":[\"/*\\n * Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\\n */\\n\\n:root {\\n\\t--ck-highlight-marker-yellow: hsl(60, 97%, 73%);\\n\\t--ck-highlight-marker-green: hsl(120, 93%, 68%);\\n\\t--ck-highlight-marker-pink: hsl(345, 96%, 73%);\\n\\t--ck-highlight-marker-blue: hsl(201, 97%, 72%);\\n\\t--ck-highlight-pen-red: hsl(0, 85%, 49%);\\n\\t--ck-highlight-pen-green: hsl(112, 100%, 27%);\\n}\\n\\n@define-mixin highlight-marker-color $color {\\n\\t.ck-content .marker-$color {\\n\\t\\tbackground-color: var(--ck-highlight-marker-$color);\\n\\t}\\n}\\n\\n@define-mixin highlight-pen-color $color {\\n\\t.ck-content .pen-$color {\\n\\t\\tcolor: var(--ck-highlight-pen-$color);\\n\\n\\t\\t/* Override default yellow background of `<mark>` from user agent stylesheet */\\n\\t\\tbackground-color: transparent;\\n\\t}\\n}\\n\\n@mixin highlight-marker-color yellow;\\n@mixin highlight-marker-color green;\\n@mixin highlight-marker-color pink;\\n@mixin highlight-marker-color blue;\\n\\n@mixin highlight-pen-color red;\\n@mixin highlight-pen-color green;\\n\"],\"sourceRoot\":\"\"}]);\n// Exports\nexport default ___CSS_LOADER_EXPORT___;\n","var g;\n\n// This works in non-strict mode\ng = (function() {\n\treturn this;\n})();\n\ntry {\n\t// This works if eval is allowed (see CSP)\n\tg = g || new Function(\"return this\")();\n} catch (e) {\n\t// This works if the window reference is available\n\tif (typeof window === \"object\") g = window;\n}\n\n// g can still be undefined, but nothing to do about it...\n// We return undefined, instead of nothing here, so it's\n// easier to handle this case. if(!global) { ...}\n\nmodule.exports = g;\n","/**\n * This method returns `false`.\n *\n * @static\n * @memberOf _\n * @since 4.13.0\n * @category Util\n * @returns {boolean} Returns `false`.\n * @example\n *\n * _.times(2, _.stubFalse);\n * // => [false, false]\n */\nfunction stubFalse() {\n  return false;\n}\n\nexport default stubFalse;\n","import root from './_root.js';\n\n/** Built-in value references. */\nvar Symbol = root.Symbol;\n\nexport default Symbol;\n","import Symbol from './_Symbol.js';\n\n/** Used for built-in method references. */\nvar objectProto = Object.prototype;\n\n/** Used to check objects for own properties. */\nvar hasOwnProperty = objectProto.hasOwnProperty;\n\n/**\n * Used to resolve the\n * [`toStringTag`](http://ecma-international.org/ecma-262/7.0/#sec-object.prototype.tostring)\n * of values.\n */\nvar nativeObjectToString = objectProto.toString;\n\n/** Built-in value references. */\nvar symToStringTag = Symbol ? Symbol.toStringTag : undefined;\n\n/**\n * A specialized version of `baseGetTag` which ignores `Symbol.toStringTag` values.\n *\n * @private\n * @param {*} value The value to query.\n * @returns {string} Returns the raw `toStringTag`.\n */\nfunction getRawTag(value) {\n  var isOwn = hasOwnProperty.call(value, symToStringTag),\n      tag = value[symToStringTag];\n\n  try {\n    value[symToStringTag] = undefined;\n    var unmasked = true;\n  } catch (e) {}\n\n  var result = nativeObjectToString.call(value);\n  if (unmasked) {\n    if (isOwn) {\n      value[symToStringTag] = tag;\n    } else {\n      delete value[symToStringTag];\n    }\n  }\n  return result;\n}\n\nexport default getRawTag;\n","/** Used for built-in method references. */\nvar objectProto = Object.prototype;\n\n/**\n * Used to resolve the\n * [`toStringTag`](http://ecma-international.org/ecma-262/7.0/#sec-object.prototype.tostring)\n * of values.\n */\nvar nativeObjectToString = objectProto.toString;\n\n/**\n * Converts `value` to a string using `Object.prototype.toString`.\n *\n * @private\n * @param {*} value The value to convert.\n * @returns {string} Returns the converted string.\n */\nfunction objectToString(value) {\n  return nativeObjectToString.call(value);\n}\n\nexport default objectToString;\n","import Symbol from './_Symbol.js';\nimport getRawTag from './_getRawTag.js';\nimport objectToString from './_objectToString.js';\n\n/** `Object#toString` result references. */\nvar nullTag = '[object Null]',\n    undefinedTag = '[object Undefined]';\n\n/** Built-in value references. */\nvar symToStringTag = Symbol ? Symbol.toStringTag : undefined;\n\n/**\n * The base implementation of `getTag` without fallbacks for buggy environments.\n *\n * @private\n * @param {*} value The value to query.\n * @returns {string} Returns the `toStringTag`.\n */\nfunction baseGetTag(value) {\n  if (value == null) {\n    return value === undefined ? undefinedTag : nullTag;\n  }\n  return (symToStringTag && symToStringTag in Object(value))\n    ? getRawTag(value)\n    : objectToString(value);\n}\n\nexport default baseGetTag;\n","/**\n * Creates a unary function that invokes `func` with its argument transformed.\n *\n * @private\n * @param {Function} func The function to wrap.\n * @param {Function} transform The argument transform.\n * @returns {Function} Returns the new function.\n */\nfunction overArg(func, transform) {\n  return function(arg) {\n    return func(transform(arg));\n  };\n}\n\nexport default overArg;\n","import overArg from './_overArg.js';\n\n/** Built-in value references. */\nvar getPrototype = overArg(Object.getPrototypeOf, Object);\n\nexport default getPrototype;\n","/**\n * Checks if `value` is object-like. A value is object-like if it's not `null`\n * and has a `typeof` result of \"object\".\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category Lang\n * @param {*} value The value to check.\n * @returns {boolean} Returns `true` if `value` is object-like, else `false`.\n * @example\n *\n * _.isObjectLike({});\n * // => true\n *\n * _.isObjectLike([1, 2, 3]);\n * // => true\n *\n * _.isObjectLike(_.noop);\n * // => false\n *\n * _.isObjectLike(null);\n * // => false\n */\nfunction isObjectLike(value) {\n  return value != null && typeof value == 'object';\n}\n\nexport default isObjectLike;\n","import baseGetTag from './_baseGetTag.js';\nimport getPrototype from './_getPrototype.js';\nimport isObjectLike from './isObjectLike.js';\n\n/** `Object#toString` result references. */\nvar objectTag = '[object Object]';\n\n/** Used for built-in method references. */\nvar funcProto = Function.prototype,\n    objectProto = Object.prototype;\n\n/** Used to resolve the decompiled source of functions. */\nvar funcToString = funcProto.toString;\n\n/** Used to check objects for own properties. */\nvar hasOwnProperty = objectProto.hasOwnProperty;\n\n/** Used to infer the `Object` constructor. */\nvar objectCtorString = funcToString.call(Object);\n\n/**\n * Checks if `value` is a plain object, that is, an object created by the\n * `Object` constructor or one with a `[[Prototype]]` of `null`.\n *\n * @static\n * @memberOf _\n * @since 0.8.0\n * @category Lang\n * @param {*} value The value to check.\n * @returns {boolean} Returns `true` if `value` is a plain object, else `false`.\n * @example\n *\n * function Foo() {\n *   this.a = 1;\n * }\n *\n * _.isPlainObject(new Foo);\n * // => false\n *\n * _.isPlainObject([1, 2, 3]);\n * // => false\n *\n * _.isPlainObject({ 'x': 0, 'y': 0 });\n * // => true\n *\n * _.isPlainObject(Object.create(null));\n * // => true\n */\nfunction isPlainObject(value) {\n  if (!isObjectLike(value) || baseGetTag(value) != objectTag) {\n    return false;\n  }\n  var proto = getPrototype(value);\n  if (proto === null) {\n    return true;\n  }\n  var Ctor = hasOwnProperty.call(proto, 'constructor') && proto.constructor;\n  return typeof Ctor == 'function' && Ctor instanceof Ctor &&\n    funcToString.call(Ctor) == objectCtorString;\n}\n\nexport default isPlainObject;\n","/**\n * Removes all key-value entries from the list cache.\n *\n * @private\n * @name clear\n * @memberOf ListCache\n */\nfunction listCacheClear() {\n  this.__data__ = [];\n  this.size = 0;\n}\n\nexport default listCacheClear;\n","/**\n * Performs a\n * [`SameValueZero`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero)\n * comparison between two values to determine if they are equivalent.\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category Lang\n * @param {*} value The value to compare.\n * @param {*} other The other value to compare.\n * @returns {boolean} Returns `true` if the values are equivalent, else `false`.\n * @example\n *\n * var object = { 'a': 1 };\n * var other = { 'a': 1 };\n *\n * _.eq(object, object);\n * // => true\n *\n * _.eq(object, other);\n * // => false\n *\n * _.eq('a', 'a');\n * // => true\n *\n * _.eq('a', Object('a'));\n * // => false\n *\n * _.eq(NaN, NaN);\n * // => true\n */\nfunction eq(value, other) {\n  return value === other || (value !== value && other !== other);\n}\n\nexport default eq;\n","import eq from './eq.js';\n\n/**\n * Gets the index at which the `key` is found in `array` of key-value pairs.\n *\n * @private\n * @param {Array} array The array to inspect.\n * @param {*} key The key to search for.\n * @returns {number} Returns the index of the matched value, else `-1`.\n */\nfunction assocIndexOf(array, key) {\n  var length = array.length;\n  while (length--) {\n    if (eq(array[length][0], key)) {\n      return length;\n    }\n  }\n  return -1;\n}\n\nexport default assocIndexOf;\n","import assocIndexOf from './_assocIndexOf.js';\n\n/** Used for built-in method references. */\nvar arrayProto = Array.prototype;\n\n/** Built-in value references. */\nvar splice = arrayProto.splice;\n\n/**\n * Removes `key` and its value from the list cache.\n *\n * @private\n * @name delete\n * @memberOf ListCache\n * @param {string} key The key of the value to remove.\n * @returns {boolean} Returns `true` if the entry was removed, else `false`.\n */\nfunction listCacheDelete(key) {\n  var data = this.__data__,\n      index = assocIndexOf(data, key);\n\n  if (index < 0) {\n    return false;\n  }\n  var lastIndex = data.length - 1;\n  if (index == lastIndex) {\n    data.pop();\n  } else {\n    splice.call(data, index, 1);\n  }\n  --this.size;\n  return true;\n}\n\nexport default listCacheDelete;\n","import assocIndexOf from './_assocIndexOf.js';\n\n/**\n * Gets the list cache value for `key`.\n *\n * @private\n * @name get\n * @memberOf ListCache\n * @param {string} key The key of the value to get.\n * @returns {*} Returns the entry value.\n */\nfunction listCacheGet(key) {\n  var data = this.__data__,\n      index = assocIndexOf(data, key);\n\n  return index < 0 ? undefined : data[index][1];\n}\n\nexport default listCacheGet;\n","import assocIndexOf from './_assocIndexOf.js';\n\n/**\n * Checks if a list cache value for `key` exists.\n *\n * @private\n * @name has\n * @memberOf ListCache\n * @param {string} key The key of the entry to check.\n * @returns {boolean} Returns `true` if an entry for `key` exists, else `false`.\n */\nfunction listCacheHas(key) {\n  return assocIndexOf(this.__data__, key) > -1;\n}\n\nexport default listCacheHas;\n","import assocIndexOf from './_assocIndexOf.js';\n\n/**\n * Sets the list cache `key` to `value`.\n *\n * @private\n * @name set\n * @memberOf ListCache\n * @param {string} key The key of the value to set.\n * @param {*} value The value to set.\n * @returns {Object} Returns the list cache instance.\n */\nfunction listCacheSet(key, value) {\n  var data = this.__data__,\n      index = assocIndexOf(data, key);\n\n  if (index < 0) {\n    ++this.size;\n    data.push([key, value]);\n  } else {\n    data[index][1] = value;\n  }\n  return this;\n}\n\nexport default listCacheSet;\n","import listCacheClear from './_listCacheClear.js';\nimport listCacheDelete from './_listCacheDelete.js';\nimport listCacheGet from './_listCacheGet.js';\nimport listCacheHas from './_listCacheHas.js';\nimport listCacheSet from './_listCacheSet.js';\n\n/**\n * Creates an list cache object.\n *\n * @private\n * @constructor\n * @param {Array} [entries] The key-value pairs to cache.\n */\nfunction ListCache(entries) {\n  var index = -1,\n      length = entries == null ? 0 : entries.length;\n\n  this.clear();\n  while (++index < length) {\n    var entry = entries[index];\n    this.set(entry[0], entry[1]);\n  }\n}\n\n// Add methods to `ListCache`.\nListCache.prototype.clear = listCacheClear;\nListCache.prototype['delete'] = listCacheDelete;\nListCache.prototype.get = listCacheGet;\nListCache.prototype.has = listCacheHas;\nListCache.prototype.set = listCacheSet;\n\nexport default ListCache;\n","import ListCache from './_ListCache.js';\n\n/**\n * Removes all key-value entries from the stack.\n *\n * @private\n * @name clear\n * @memberOf Stack\n */\nfunction stackClear() {\n  this.__data__ = new ListCache;\n  this.size = 0;\n}\n\nexport default stackClear;\n","/**\n * Removes `key` and its value from the stack.\n *\n * @private\n * @name delete\n * @memberOf Stack\n * @param {string} key The key of the value to remove.\n * @returns {boolean} Returns `true` if the entry was removed, else `false`.\n */\nfunction stackDelete(key) {\n  var data = this.__data__,\n      result = data['delete'](key);\n\n  this.size = data.size;\n  return result;\n}\n\nexport default stackDelete;\n","/**\n * Gets the stack value for `key`.\n *\n * @private\n * @name get\n * @memberOf Stack\n * @param {string} key The key of the value to get.\n * @returns {*} Returns the entry value.\n */\nfunction stackGet(key) {\n  return this.__data__.get(key);\n}\n\nexport default stackGet;\n","/**\n * Checks if a stack value for `key` exists.\n *\n * @private\n * @name has\n * @memberOf Stack\n * @param {string} key The key of the entry to check.\n * @returns {boolean} Returns `true` if an entry for `key` exists, else `false`.\n */\nfunction stackHas(key) {\n  return this.__data__.has(key);\n}\n\nexport default stackHas;\n","/**\n * Checks if `value` is the\n * [language type](http://www.ecma-international.org/ecma-262/7.0/#sec-ecmascript-language-types)\n * of `Object`. (e.g. arrays, functions, objects, regexes, `new Number(0)`, and `new String('')`)\n *\n * @static\n * @memberOf _\n * @since 0.1.0\n * @category Lang\n * @param {*} value The value to check.\n * @returns {boolean} Returns `true` if `value` is an object, else `false`.\n * @example\n *\n * _.isObject({});\n * // => true\n *\n * _.isObject([1, 2, 3]);\n * // => true\n *\n * _.isObject(_.noop);\n * // => true\n *\n * _.isObject(null);\n * // => false\n */\nfunction isObject(value) {\n  var type = typeof value;\n  return value != null && (type == 'object' || type == 'function');\n}\n\nexport default isObject;\n","import baseGetTag from './_baseGetTag.js';\nimport isObject from './isObject.js';\n\n/** `Object#toString` result references. */\nvar asyncTag = '[object AsyncFunction]',\n    funcTag = '[object Function]',\n    genTag = '[object GeneratorFunction]',\n    proxyTag = '[object Proxy]';\n\n/**\n * Checks if `value` is classified as a `Function` object.\n *\n * @static\n * @memberOf _\n * @since 0.1.0\n * @category Lang\n * @param {*} value The value to check.\n * @returns {boolean} Returns `true` if `value` is a function, else `false`.\n * @example\n *\n * _.isFunction(_);\n * // => true\n *\n * _.isFunction(/abc/);\n * // => false\n */\nfunction isFunction(value) {\n  if (!isObject(value)) {\n    return false;\n  }\n  // The use of `Object#toString` avoids issues with the `typeof` operator\n  // in Safari 9 which returns 'object' for typed arrays and other constructors.\n  var tag = baseGetTag(value);\n  return tag == funcTag || tag == genTag || tag == asyncTag || tag == proxyTag;\n}\n\nexport default isFunction;\n","import coreJsData from './_coreJsData.js';\n\n/** Used to detect methods masquerading as native. */\nvar maskSrcKey = (function() {\n  var uid = /[^.]+$/.exec(coreJsData && coreJsData.keys && coreJsData.keys.IE_PROTO || '');\n  return uid ? ('Symbol(src)_1.' + uid) : '';\n}());\n\n/**\n * Checks if `func` has its source masked.\n *\n * @private\n * @param {Function} func The function to check.\n * @returns {boolean} Returns `true` if `func` is masked, else `false`.\n */\nfunction isMasked(func) {\n  return !!maskSrcKey && (maskSrcKey in func);\n}\n\nexport default isMasked;\n","import root from './_root.js';\n\n/** Used to detect overreaching core-js shims. */\nvar coreJsData = root['__core-js_shared__'];\n\nexport default coreJsData;\n","/** Used for built-in method references. */\nvar funcProto = Function.prototype;\n\n/** Used to resolve the decompiled source of functions. */\nvar funcToString = funcProto.toString;\n\n/**\n * Converts `func` to its source code.\n *\n * @private\n * @param {Function} func The function to convert.\n * @returns {string} Returns the source code.\n */\nfunction toSource(func) {\n  if (func != null) {\n    try {\n      return funcToString.call(func);\n    } catch (e) {}\n    try {\n      return (func + '');\n    } catch (e) {}\n  }\n  return '';\n}\n\nexport default toSource;\n","import isFunction from './isFunction.js';\nimport isMasked from './_isMasked.js';\nimport isObject from './isObject.js';\nimport toSource from './_toSource.js';\n\n/**\n * Used to match `RegExp`\n * [syntax characters](http://ecma-international.org/ecma-262/7.0/#sec-patterns).\n */\nvar reRegExpChar = /[\\\\^$.*+?()[\\]{}|]/g;\n\n/** Used to detect host constructors (Safari). */\nvar reIsHostCtor = /^\\[object .+?Constructor\\]$/;\n\n/** Used for built-in method references. */\nvar funcProto = Function.prototype,\n    objectProto = Object.prototype;\n\n/** Used to resolve the decompiled source of functions. */\nvar funcToString = funcProto.toString;\n\n/** Used to check objects for own properties. */\nvar hasOwnProperty = objectProto.hasOwnProperty;\n\n/** Used to detect if a method is native. */\nvar reIsNative = RegExp('^' +\n  funcToString.call(hasOwnProperty).replace(reRegExpChar, '\\\\$&')\n  .replace(/hasOwnProperty|(function).*?(?=\\\\\\()| for .+?(?=\\\\\\])/g, '$1.*?') + '$'\n);\n\n/**\n * The base implementation of `_.isNative` without bad shim checks.\n *\n * @private\n * @param {*} value The value to check.\n * @returns {boolean} Returns `true` if `value` is a native function,\n *  else `false`.\n */\nfunction baseIsNative(value) {\n  if (!isObject(value) || isMasked(value)) {\n    return false;\n  }\n  var pattern = isFunction(value) ? reIsNative : reIsHostCtor;\n  return pattern.test(toSource(value));\n}\n\nexport default baseIsNative;\n","/**\n * Gets the value at `key` of `object`.\n *\n * @private\n * @param {Object} [object] The object to query.\n * @param {string} key The key of the property to get.\n * @returns {*} Returns the property value.\n */\nfunction getValue(object, key) {\n  return object == null ? undefined : object[key];\n}\n\nexport default getValue;\n","import baseIsNative from './_baseIsNative.js';\nimport getValue from './_getValue.js';\n\n/**\n * Gets the native function at `key` of `object`.\n *\n * @private\n * @param {Object} object The object to query.\n * @param {string} key The key of the method to get.\n * @returns {*} Returns the function if it's native, else `undefined`.\n */\nfunction getNative(object, key) {\n  var value = getValue(object, key);\n  return baseIsNative(value) ? value : undefined;\n}\n\nexport default getNative;\n","import getNative from './_getNative.js';\nimport root from './_root.js';\n\n/* Built-in method references that are verified to be native. */\nvar Map = getNative(root, 'Map');\n\nexport default Map;\n","import getNative from './_getNative.js';\n\n/* Built-in method references that are verified to be native. */\nvar nativeCreate = getNative(Object, 'create');\n\nexport default nativeCreate;\n","import nativeCreate from './_nativeCreate.js';\n\n/**\n * Removes all key-value entries from the hash.\n *\n * @private\n * @name clear\n * @memberOf Hash\n */\nfunction hashClear() {\n  this.__data__ = nativeCreate ? nativeCreate(null) : {};\n  this.size = 0;\n}\n\nexport default hashClear;\n","/**\n * Removes `key` and its value from the hash.\n *\n * @private\n * @name delete\n * @memberOf Hash\n * @param {Object} hash The hash to modify.\n * @param {string} key The key of the value to remove.\n * @returns {boolean} Returns `true` if the entry was removed, else `false`.\n */\nfunction hashDelete(key) {\n  var result = this.has(key) && delete this.__data__[key];\n  this.size -= result ? 1 : 0;\n  return result;\n}\n\nexport default hashDelete;\n","import nativeCreate from './_nativeCreate.js';\n\n/** Used to stand-in for `undefined` hash values. */\nvar HASH_UNDEFINED = '__lodash_hash_undefined__';\n\n/** Used for built-in method references. */\nvar objectProto = Object.prototype;\n\n/** Used to check objects for own properties. */\nvar hasOwnProperty = objectProto.hasOwnProperty;\n\n/**\n * Gets the hash value for `key`.\n *\n * @private\n * @name get\n * @memberOf Hash\n * @param {string} key The key of the value to get.\n * @returns {*} Returns the entry value.\n */\nfunction hashGet(key) {\n  var data = this.__data__;\n  if (nativeCreate) {\n    var result = data[key];\n    return result === HASH_UNDEFINED ? undefined : result;\n  }\n  return hasOwnProperty.call(data, key) ? data[key] : undefined;\n}\n\nexport default hashGet;\n","import nativeCreate from './_nativeCreate.js';\n\n/** Used for built-in method references. */\nvar objectProto = Object.prototype;\n\n/** Used to check objects for own properties. */\nvar hasOwnProperty = objectProto.hasOwnProperty;\n\n/**\n * Checks if a hash value for `key` exists.\n *\n * @private\n * @name has\n * @memberOf Hash\n * @param {string} key The key of the entry to check.\n * @returns {boolean} Returns `true` if an entry for `key` exists, else `false`.\n */\nfunction hashHas(key) {\n  var data = this.__data__;\n  return nativeCreate ? (data[key] !== undefined) : hasOwnProperty.call(data, key);\n}\n\nexport default hashHas;\n","import nativeCreate from './_nativeCreate.js';\n\n/** Used to stand-in for `undefined` hash values. */\nvar HASH_UNDEFINED = '__lodash_hash_undefined__';\n\n/**\n * Sets the hash `key` to `value`.\n *\n * @private\n * @name set\n * @memberOf Hash\n * @param {string} key The key of the value to set.\n * @param {*} value The value to set.\n * @returns {Object} Returns the hash instance.\n */\nfunction hashSet(key, value) {\n  var data = this.__data__;\n  this.size += this.has(key) ? 0 : 1;\n  data[key] = (nativeCreate && value === undefined) ? HASH_UNDEFINED : value;\n  return this;\n}\n\nexport default hashSet;\n","import hashClear from './_hashClear.js';\nimport hashDelete from './_hashDelete.js';\nimport hashGet from './_hashGet.js';\nimport hashHas from './_hashHas.js';\nimport hashSet from './_hashSet.js';\n\n/**\n * Creates a hash object.\n *\n * @private\n * @constructor\n * @param {Array} [entries] The key-value pairs to cache.\n */\nfunction Hash(entries) {\n  var index = -1,\n      length = entries == null ? 0 : entries.length;\n\n  this.clear();\n  while (++index < length) {\n    var entry = entries[index];\n    this.set(entry[0], entry[1]);\n  }\n}\n\n// Add methods to `Hash`.\nHash.prototype.clear = hashClear;\nHash.prototype['delete'] = hashDelete;\nHash.prototype.get = hashGet;\nHash.prototype.has = hashHas;\nHash.prototype.set = hashSet;\n\nexport default Hash;\n","import Hash from './_Hash.js';\nimport ListCache from './_ListCache.js';\nimport Map from './_Map.js';\n\n/**\n * Removes all key-value entries from the map.\n *\n * @private\n * @name clear\n * @memberOf MapCache\n */\nfunction mapCacheClear() {\n  this.size = 0;\n  this.__data__ = {\n    'hash': new Hash,\n    'map': new (Map || ListCache),\n    'string': new Hash\n  };\n}\n\nexport default mapCacheClear;\n","/**\n * Checks if `value` is suitable for use as unique object key.\n *\n * @private\n * @param {*} value The value to check.\n * @returns {boolean} Returns `true` if `value` is suitable, else `false`.\n */\nfunction isKeyable(value) {\n  var type = typeof value;\n  return (type == 'string' || type == 'number' || type == 'symbol' || type == 'boolean')\n    ? (value !== '__proto__')\n    : (value === null);\n}\n\nexport default isKeyable;\n","import isKeyable from './_isKeyable.js';\n\n/**\n * Gets the data for `map`.\n *\n * @private\n * @param {Object} map The map to query.\n * @param {string} key The reference key.\n * @returns {*} Returns the map data.\n */\nfunction getMapData(map, key) {\n  var data = map.__data__;\n  return isKeyable(key)\n    ? data[typeof key == 'string' ? 'string' : 'hash']\n    : data.map;\n}\n\nexport default getMapData;\n","import getMapData from './_getMapData.js';\n\n/**\n * Removes `key` and its value from the map.\n *\n * @private\n * @name delete\n * @memberOf MapCache\n * @param {string} key The key of the value to remove.\n * @returns {boolean} Returns `true` if the entry was removed, else `false`.\n */\nfunction mapCacheDelete(key) {\n  var result = getMapData(this, key)['delete'](key);\n  this.size -= result ? 1 : 0;\n  return result;\n}\n\nexport default mapCacheDelete;\n","import getMapData from './_getMapData.js';\n\n/**\n * Gets the map value for `key`.\n *\n * @private\n * @name get\n * @memberOf MapCache\n * @param {string} key The key of the value to get.\n * @returns {*} Returns the entry value.\n */\nfunction mapCacheGet(key) {\n  return getMapData(this, key).get(key);\n}\n\nexport default mapCacheGet;\n","import getMapData from './_getMapData.js';\n\n/**\n * Checks if a map value for `key` exists.\n *\n * @private\n * @name has\n * @memberOf MapCache\n * @param {string} key The key of the entry to check.\n * @returns {boolean} Returns `true` if an entry for `key` exists, else `false`.\n */\nfunction mapCacheHas(key) {\n  return getMapData(this, key).has(key);\n}\n\nexport default mapCacheHas;\n","import getMapData from './_getMapData.js';\n\n/**\n * Sets the map `key` to `value`.\n *\n * @private\n * @name set\n * @memberOf MapCache\n * @param {string} key The key of the value to set.\n * @param {*} value The value to set.\n * @returns {Object} Returns the map cache instance.\n */\nfunction mapCacheSet(key, value) {\n  var data = getMapData(this, key),\n      size = data.size;\n\n  data.set(key, value);\n  this.size += data.size == size ? 0 : 1;\n  return this;\n}\n\nexport default mapCacheSet;\n","import mapCacheClear from './_mapCacheClear.js';\nimport mapCacheDelete from './_mapCacheDelete.js';\nimport mapCacheGet from './_mapCacheGet.js';\nimport mapCacheHas from './_mapCacheHas.js';\nimport mapCacheSet from './_mapCacheSet.js';\n\n/**\n * Creates a map cache object to store key-value pairs.\n *\n * @private\n * @constructor\n * @param {Array} [entries] The key-value pairs to cache.\n */\nfunction MapCache(entries) {\n  var index = -1,\n      length = entries == null ? 0 : entries.length;\n\n  this.clear();\n  while (++index < length) {\n    var entry = entries[index];\n    this.set(entry[0], entry[1]);\n  }\n}\n\n// Add methods to `MapCache`.\nMapCache.prototype.clear = mapCacheClear;\nMapCache.prototype['delete'] = mapCacheDelete;\nMapCache.prototype.get = mapCacheGet;\nMapCache.prototype.has = mapCacheHas;\nMapCache.prototype.set = mapCacheSet;\n\nexport default MapCache;\n","import ListCache from './_ListCache.js';\nimport Map from './_Map.js';\nimport MapCache from './_MapCache.js';\n\n/** Used as the size to enable large array optimizations. */\nvar LARGE_ARRAY_SIZE = 200;\n\n/**\n * Sets the stack `key` to `value`.\n *\n * @private\n * @name set\n * @memberOf Stack\n * @param {string} key The key of the value to set.\n * @param {*} value The value to set.\n * @returns {Object} Returns the stack cache instance.\n */\nfunction stackSet(key, value) {\n  var data = this.__data__;\n  if (data instanceof ListCache) {\n    var pairs = data.__data__;\n    if (!Map || (pairs.length < LARGE_ARRAY_SIZE - 1)) {\n      pairs.push([key, value]);\n      this.size = ++data.size;\n      return this;\n    }\n    data = this.__data__ = new MapCache(pairs);\n  }\n  data.set(key, value);\n  this.size = data.size;\n  return this;\n}\n\nexport default stackSet;\n","import ListCache from './_ListCache.js';\nimport stackClear from './_stackClear.js';\nimport stackDelete from './_stackDelete.js';\nimport stackGet from './_stackGet.js';\nimport stackHas from './_stackHas.js';\nimport stackSet from './_stackSet.js';\n\n/**\n * Creates a stack cache object to store key-value pairs.\n *\n * @private\n * @constructor\n * @param {Array} [entries] The key-value pairs to cache.\n */\nfunction Stack(entries) {\n  var data = this.__data__ = new ListCache(entries);\n  this.size = data.size;\n}\n\n// Add methods to `Stack`.\nStack.prototype.clear = stackClear;\nStack.prototype['delete'] = stackDelete;\nStack.prototype.get = stackGet;\nStack.prototype.has = stackHas;\nStack.prototype.set = stackSet;\n\nexport default Stack;\n","/**\n * A specialized version of `_.forEach` for arrays without support for\n * iteratee shorthands.\n *\n * @private\n * @param {Array} [array] The array to iterate over.\n * @param {Function} iteratee The function invoked per iteration.\n * @returns {Array} Returns `array`.\n */\nfunction arrayEach(array, iteratee) {\n  var index = -1,\n      length = array == null ? 0 : array.length;\n\n  while (++index < length) {\n    if (iteratee(array[index], index, array) === false) {\n      break;\n    }\n  }\n  return array;\n}\n\nexport default arrayEach;\n","import getNative from './_getNative.js';\n\nvar defineProperty = (function() {\n  try {\n    var func = getNative(Object, 'defineProperty');\n    func({}, '', {});\n    return func;\n  } catch (e) {}\n}());\n\nexport default defineProperty;\n","import defineProperty from './_defineProperty.js';\n\n/**\n * The base implementation of `assignValue` and `assignMergeValue` without\n * value checks.\n *\n * @private\n * @param {Object} object The object to modify.\n * @param {string} key The key of the property to assign.\n * @param {*} value The value to assign.\n */\nfunction baseAssignValue(object, key, value) {\n  if (key == '__proto__' && defineProperty) {\n    defineProperty(object, key, {\n      'configurable': true,\n      'enumerable': true,\n      'value': value,\n      'writable': true\n    });\n  } else {\n    object[key] = value;\n  }\n}\n\nexport default baseAssignValue;\n","import baseAssignValue from './_baseAssignValue.js';\nimport eq from './eq.js';\n\n/** Used for built-in method references. */\nvar objectProto = Object.prototype;\n\n/** Used to check objects for own properties. */\nvar hasOwnProperty = objectProto.hasOwnProperty;\n\n/**\n * Assigns `value` to `key` of `object` if the existing value is not equivalent\n * using [`SameValueZero`](http://ecma-international.org/ecma-262/7.0/#sec-samevaluezero)\n * for equality comparisons.\n *\n * @private\n * @param {Object} object The object to modify.\n * @param {string} key The key of the property to assign.\n * @param {*} value The value to assign.\n */\nfunction assignValue(object, key, value) {\n  var objValue = object[key];\n  if (!(hasOwnProperty.call(object, key) && eq(objValue, value)) ||\n      (value === undefined && !(key in object))) {\n    baseAssignValue(object, key, value);\n  }\n}\n\nexport default assignValue;\n","import assignValue from './_assignValue.js';\nimport baseAssignValue from './_baseAssignValue.js';\n\n/**\n * Copies properties of `source` to `object`.\n *\n * @private\n * @param {Object} source The object to copy properties from.\n * @param {Array} props The property identifiers to copy.\n * @param {Object} [object={}] The object to copy properties to.\n * @param {Function} [customizer] The function to customize copied values.\n * @returns {Object} Returns `object`.\n */\nfunction copyObject(source, props, object, customizer) {\n  var isNew = !object;\n  object || (object = {});\n\n  var index = -1,\n      length = props.length;\n\n  while (++index < length) {\n    var key = props[index];\n\n    var newValue = customizer\n      ? customizer(object[key], source[key], key, object, source)\n      : undefined;\n\n    if (newValue === undefined) {\n      newValue = source[key];\n    }\n    if (isNew) {\n      baseAssignValue(object, key, newValue);\n    } else {\n      assignValue(object, key, newValue);\n    }\n  }\n  return object;\n}\n\nexport default copyObject;\n","/**\n * The base implementation of `_.times` without support for iteratee shorthands\n * or max array length checks.\n *\n * @private\n * @param {number} n The number of times to invoke `iteratee`.\n * @param {Function} iteratee The function invoked per iteration.\n * @returns {Array} Returns the array of results.\n */\nfunction baseTimes(n, iteratee) {\n  var index = -1,\n      result = Array(n);\n\n  while (++index < n) {\n    result[index] = iteratee(index);\n  }\n  return result;\n}\n\nexport default baseTimes;\n","import baseGetTag from './_baseGetTag.js';\nimport isObjectLike from './isObjectLike.js';\n\n/** `Object#toString` result references. */\nvar argsTag = '[object Arguments]';\n\n/**\n * The base implementation of `_.isArguments`.\n *\n * @private\n * @param {*} value The value to check.\n * @returns {boolean} Returns `true` if `value` is an `arguments` object,\n */\nfunction baseIsArguments(value) {\n  return isObjectLike(value) && baseGetTag(value) == argsTag;\n}\n\nexport default baseIsArguments;\n","import baseIsArguments from './_baseIsArguments.js';\nimport isObjectLike from './isObjectLike.js';\n\n/** Used for built-in method references. */\nvar objectProto = Object.prototype;\n\n/** Used to check objects for own properties. */\nvar hasOwnProperty = objectProto.hasOwnProperty;\n\n/** Built-in value references. */\nvar propertyIsEnumerable = objectProto.propertyIsEnumerable;\n\n/**\n * Checks if `value` is likely an `arguments` object.\n *\n * @static\n * @memberOf _\n * @since 0.1.0\n * @category Lang\n * @param {*} value The value to check.\n * @returns {boolean} Returns `true` if `value` is an `arguments` object,\n *  else `false`.\n * @example\n *\n * _.isArguments(function() { return arguments; }());\n * // => true\n *\n * _.isArguments([1, 2, 3]);\n * // => false\n */\nvar isArguments = baseIsArguments(function() { return arguments; }()) ? baseIsArguments : function(value) {\n  return isObjectLike(value) && hasOwnProperty.call(value, 'callee') &&\n    !propertyIsEnumerable.call(value, 'callee');\n};\n\nexport default isArguments;\n","/**\n * Checks if `value` is classified as an `Array` object.\n *\n * @static\n * @memberOf _\n * @since 0.1.0\n * @category Lang\n * @param {*} value The value to check.\n * @returns {boolean} Returns `true` if `value` is an array, else `false`.\n * @example\n *\n * _.isArray([1, 2, 3]);\n * // => true\n *\n * _.isArray(document.body.children);\n * // => false\n *\n * _.isArray('abc');\n * // => false\n *\n * _.isArray(_.noop);\n * // => false\n */\nvar isArray = Array.isArray;\n\nexport default isArray;\n","/** Used as references for various `Number` constants. */\nvar MAX_SAFE_INTEGER = 9007199254740991;\n\n/** Used to detect unsigned integer values. */\nvar reIsUint = /^(?:0|[1-9]\\d*)$/;\n\n/**\n * Checks if `value` is a valid array-like index.\n *\n * @private\n * @param {*} value The value to check.\n * @param {number} [length=MAX_SAFE_INTEGER] The upper bounds of a valid index.\n * @returns {boolean} Returns `true` if `value` is a valid index, else `false`.\n */\nfunction isIndex(value, length) {\n  var type = typeof value;\n  length = length == null ? MAX_SAFE_INTEGER : length;\n\n  return !!length &&\n    (type == 'number' ||\n      (type != 'symbol' && reIsUint.test(value))) &&\n        (value > -1 && value % 1 == 0 && value < length);\n}\n\nexport default isIndex;\n","/** Used as references for various `Number` constants. */\nvar MAX_SAFE_INTEGER = 9007199254740991;\n\n/**\n * Checks if `value` is a valid array-like length.\n *\n * **Note:** This method is loosely based on\n * [`ToLength`](http://ecma-international.org/ecma-262/7.0/#sec-tolength).\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category Lang\n * @param {*} value The value to check.\n * @returns {boolean} Returns `true` if `value` is a valid length, else `false`.\n * @example\n *\n * _.isLength(3);\n * // => true\n *\n * _.isLength(Number.MIN_VALUE);\n * // => false\n *\n * _.isLength(Infinity);\n * // => false\n *\n * _.isLength('3');\n * // => false\n */\nfunction isLength(value) {\n  return typeof value == 'number' &&\n    value > -1 && value % 1 == 0 && value <= MAX_SAFE_INTEGER;\n}\n\nexport default isLength;\n","import baseGetTag from './_baseGetTag.js';\nimport isLength from './isLength.js';\nimport isObjectLike from './isObjectLike.js';\n\n/** `Object#toString` result references. */\nvar argsTag = '[object Arguments]',\n    arrayTag = '[object Array]',\n    boolTag = '[object Boolean]',\n    dateTag = '[object Date]',\n    errorTag = '[object Error]',\n    funcTag = '[object Function]',\n    mapTag = '[object Map]',\n    numberTag = '[object Number]',\n    objectTag = '[object Object]',\n    regexpTag = '[object RegExp]',\n    setTag = '[object Set]',\n    stringTag = '[object String]',\n    weakMapTag = '[object WeakMap]';\n\nvar arrayBufferTag = '[object ArrayBuffer]',\n    dataViewTag = '[object DataView]',\n    float32Tag = '[object Float32Array]',\n    float64Tag = '[object Float64Array]',\n    int8Tag = '[object Int8Array]',\n    int16Tag = '[object Int16Array]',\n    int32Tag = '[object Int32Array]',\n    uint8Tag = '[object Uint8Array]',\n    uint8ClampedTag = '[object Uint8ClampedArray]',\n    uint16Tag = '[object Uint16Array]',\n    uint32Tag = '[object Uint32Array]';\n\n/** Used to identify `toStringTag` values of typed arrays. */\nvar typedArrayTags = {};\ntypedArrayTags[float32Tag] = typedArrayTags[float64Tag] =\ntypedArrayTags[int8Tag] = typedArrayTags[int16Tag] =\ntypedArrayTags[int32Tag] = typedArrayTags[uint8Tag] =\ntypedArrayTags[uint8ClampedTag] = typedArrayTags[uint16Tag] =\ntypedArrayTags[uint32Tag] = true;\ntypedArrayTags[argsTag] = typedArrayTags[arrayTag] =\ntypedArrayTags[arrayBufferTag] = typedArrayTags[boolTag] =\ntypedArrayTags[dataViewTag] = typedArrayTags[dateTag] =\ntypedArrayTags[errorTag] = typedArrayTags[funcTag] =\ntypedArrayTags[mapTag] = typedArrayTags[numberTag] =\ntypedArrayTags[objectTag] = typedArrayTags[regexpTag] =\ntypedArrayTags[setTag] = typedArrayTags[stringTag] =\ntypedArrayTags[weakMapTag] = false;\n\n/**\n * The base implementation of `_.isTypedArray` without Node.js optimizations.\n *\n * @private\n * @param {*} value The value to check.\n * @returns {boolean} Returns `true` if `value` is a typed array, else `false`.\n */\nfunction baseIsTypedArray(value) {\n  return isObjectLike(value) &&\n    isLength(value.length) && !!typedArrayTags[baseGetTag(value)];\n}\n\nexport default baseIsTypedArray;\n","/**\n * The base implementation of `_.unary` without support for storing metadata.\n *\n * @private\n * @param {Function} func The function to cap arguments for.\n * @returns {Function} Returns the new capped function.\n */\nfunction baseUnary(func) {\n  return function(value) {\n    return func(value);\n  };\n}\n\nexport default baseUnary;\n","import baseIsTypedArray from './_baseIsTypedArray.js';\nimport baseUnary from './_baseUnary.js';\nimport nodeUtil from './_nodeUtil.js';\n\n/* Node.js helper references. */\nvar nodeIsTypedArray = nodeUtil && nodeUtil.isTypedArray;\n\n/**\n * Checks if `value` is classified as a typed array.\n *\n * @static\n * @memberOf _\n * @since 3.0.0\n * @category Lang\n * @param {*} value The value to check.\n * @returns {boolean} Returns `true` if `value` is a typed array, else `false`.\n * @example\n *\n * _.isTypedArray(new Uint8Array);\n * // => true\n *\n * _.isTypedArray([]);\n * // => false\n */\nvar isTypedArray = nodeIsTypedArray ? baseUnary(nodeIsTypedArray) : baseIsTypedArray;\n\nexport default isTypedArray;\n","import baseTimes from './_baseTimes.js';\nimport isArguments from './isArguments.js';\nimport isArray from './isArray.js';\nimport isBuffer from './isBuffer.js';\nimport isIndex from './_isIndex.js';\nimport isTypedArray from './isTypedArray.js';\n\n/** Used for built-in method references. */\nvar objectProto = Object.prototype;\n\n/** Used to check objects for own properties. */\nvar hasOwnProperty = objectProto.hasOwnProperty;\n\n/**\n * Creates an array of the enumerable property names of the array-like `value`.\n *\n * @private\n * @param {*} value The value to query.\n * @param {boolean} inherited Specify returning inherited property names.\n * @returns {Array} Returns the array of property names.\n */\nfunction arrayLikeKeys(value, inherited) {\n  var isArr = isArray(value),\n      isArg = !isArr && isArguments(value),\n      isBuff = !isArr && !isArg && isBuffer(value),\n      isType = !isArr && !isArg && !isBuff && isTypedArray(value),\n      skipIndexes = isArr || isArg || isBuff || isType,\n      result = skipIndexes ? baseTimes(value.length, String) : [],\n      length = result.length;\n\n  for (var key in value) {\n    if ((inherited || hasOwnProperty.call(value, key)) &&\n        !(skipIndexes && (\n           // Safari 9 has enumerable `arguments.length` in strict mode.\n           key == 'length' ||\n           // Node.js 0.10 has enumerable non-index properties on buffers.\n           (isBuff && (key == 'offset' || key == 'parent')) ||\n           // PhantomJS 2 has enumerable non-index properties on typed arrays.\n           (isType && (key == 'buffer' || key == 'byteLength' || key == 'byteOffset')) ||\n           // Skip index properties.\n           isIndex(key, length)\n        ))) {\n      result.push(key);\n    }\n  }\n  return result;\n}\n\nexport default arrayLikeKeys;\n","/** Used for built-in method references. */\nvar objectProto = Object.prototype;\n\n/**\n * Checks if `value` is likely a prototype object.\n *\n * @private\n * @param {*} value The value to check.\n * @returns {boolean} Returns `true` if `value` is a prototype, else `false`.\n */\nfunction isPrototype(value) {\n  var Ctor = value && value.constructor,\n      proto = (typeof Ctor == 'function' && Ctor.prototype) || objectProto;\n\n  return value === proto;\n}\n\nexport default isPrototype;\n","import overArg from './_overArg.js';\n\n/* Built-in method references for those with the same name as other `lodash` methods. */\nvar nativeKeys = overArg(Object.keys, Object);\n\nexport default nativeKeys;\n","import isPrototype from './_isPrototype.js';\nimport nativeKeys from './_nativeKeys.js';\n\n/** Used for built-in method references. */\nvar objectProto = Object.prototype;\n\n/** Used to check objects for own properties. */\nvar hasOwnProperty = objectProto.hasOwnProperty;\n\n/**\n * The base implementation of `_.keys` which doesn't treat sparse arrays as dense.\n *\n * @private\n * @param {Object} object The object to query.\n * @returns {Array} Returns the array of property names.\n */\nfunction baseKeys(object) {\n  if (!isPrototype(object)) {\n    return nativeKeys(object);\n  }\n  var result = [];\n  for (var key in Object(object)) {\n    if (hasOwnProperty.call(object, key) && key != 'constructor') {\n      result.push(key);\n    }\n  }\n  return result;\n}\n\nexport default baseKeys;\n","import isFunction from './isFunction.js';\nimport isLength from './isLength.js';\n\n/**\n * Checks if `value` is array-like. A value is considered array-like if it's\n * not a function and has a `value.length` that's an integer greater than or\n * equal to `0` and less than or equal to `Number.MAX_SAFE_INTEGER`.\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category Lang\n * @param {*} value The value to check.\n * @returns {boolean} Returns `true` if `value` is array-like, else `false`.\n * @example\n *\n * _.isArrayLike([1, 2, 3]);\n * // => true\n *\n * _.isArrayLike(document.body.children);\n * // => true\n *\n * _.isArrayLike('abc');\n * // => true\n *\n * _.isArrayLike(_.noop);\n * // => false\n */\nfunction isArrayLike(value) {\n  return value != null && isLength(value.length) && !isFunction(value);\n}\n\nexport default isArrayLike;\n","import arrayLikeKeys from './_arrayLikeKeys.js';\nimport baseKeys from './_baseKeys.js';\nimport isArrayLike from './isArrayLike.js';\n\n/**\n * Creates an array of the own enumerable property names of `object`.\n *\n * **Note:** Non-object values are coerced to objects. See the\n * [ES spec](http://ecma-international.org/ecma-262/7.0/#sec-object.keys)\n * for more details.\n *\n * @static\n * @since 0.1.0\n * @memberOf _\n * @category Object\n * @param {Object} object The object to query.\n * @returns {Array} Returns the array of property names.\n * @example\n *\n * function Foo() {\n *   this.a = 1;\n *   this.b = 2;\n * }\n *\n * Foo.prototype.c = 3;\n *\n * _.keys(new Foo);\n * // => ['a', 'b'] (iteration order is not guaranteed)\n *\n * _.keys('hi');\n * // => ['0', '1']\n */\nfunction keys(object) {\n  return isArrayLike(object) ? arrayLikeKeys(object) : baseKeys(object);\n}\n\nexport default keys;\n","import copyObject from './_copyObject.js';\nimport keys from './keys.js';\n\n/**\n * The base implementation of `_.assign` without support for multiple sources\n * or `customizer` functions.\n *\n * @private\n * @param {Object} object The destination object.\n * @param {Object} source The source object.\n * @returns {Object} Returns `object`.\n */\nfunction baseAssign(object, source) {\n  return object && copyObject(source, keys(source), object);\n}\n\nexport default baseAssign;\n","/**\n * This function is like\n * [`Object.keys`](http://ecma-international.org/ecma-262/7.0/#sec-object.keys)\n * except that it includes inherited enumerable properties.\n *\n * @private\n * @param {Object} object The object to query.\n * @returns {Array} Returns the array of property names.\n */\nfunction nativeKeysIn(object) {\n  var result = [];\n  if (object != null) {\n    for (var key in Object(object)) {\n      result.push(key);\n    }\n  }\n  return result;\n}\n\nexport default nativeKeysIn;\n","import isObject from './isObject.js';\nimport isPrototype from './_isPrototype.js';\nimport nativeKeysIn from './_nativeKeysIn.js';\n\n/** Used for built-in method references. */\nvar objectProto = Object.prototype;\n\n/** Used to check objects for own properties. */\nvar hasOwnProperty = objectProto.hasOwnProperty;\n\n/**\n * The base implementation of `_.keysIn` which doesn't treat sparse arrays as dense.\n *\n * @private\n * @param {Object} object The object to query.\n * @returns {Array} Returns the array of property names.\n */\nfunction baseKeysIn(object) {\n  if (!isObject(object)) {\n    return nativeKeysIn(object);\n  }\n  var isProto = isPrototype(object),\n      result = [];\n\n  for (var key in object) {\n    if (!(key == 'constructor' && (isProto || !hasOwnProperty.call(object, key)))) {\n      result.push(key);\n    }\n  }\n  return result;\n}\n\nexport default baseKeysIn;\n","import arrayLikeKeys from './_arrayLikeKeys.js';\nimport baseKeysIn from './_baseKeysIn.js';\nimport isArrayLike from './isArrayLike.js';\n\n/**\n * Creates an array of the own and inherited enumerable property names of `object`.\n *\n * **Note:** Non-object values are coerced to objects.\n *\n * @static\n * @memberOf _\n * @since 3.0.0\n * @category Object\n * @param {Object} object The object to query.\n * @returns {Array} Returns the array of property names.\n * @example\n *\n * function Foo() {\n *   this.a = 1;\n *   this.b = 2;\n * }\n *\n * Foo.prototype.c = 3;\n *\n * _.keysIn(new Foo);\n * // => ['a', 'b', 'c'] (iteration order is not guaranteed)\n */\nfunction keysIn(object) {\n  return isArrayLike(object) ? arrayLikeKeys(object, true) : baseKeysIn(object);\n}\n\nexport default keysIn;\n","import copyObject from './_copyObject.js';\nimport keysIn from './keysIn.js';\n\n/**\n * The base implementation of `_.assignIn` without support for multiple sources\n * or `customizer` functions.\n *\n * @private\n * @param {Object} object The destination object.\n * @param {Object} source The source object.\n * @returns {Object} Returns `object`.\n */\nfunction baseAssignIn(object, source) {\n  return object && copyObject(source, keysIn(source), object);\n}\n\nexport default baseAssignIn;\n","/**\n * Copies the values of `source` to `array`.\n *\n * @private\n * @param {Array} source The array to copy values from.\n * @param {Array} [array=[]] The array to copy values to.\n * @returns {Array} Returns `array`.\n */\nfunction copyArray(source, array) {\n  var index = -1,\n      length = source.length;\n\n  array || (array = Array(length));\n  while (++index < length) {\n    array[index] = source[index];\n  }\n  return array;\n}\n\nexport default copyArray;\n","/**\n * A specialized version of `_.filter` for arrays without support for\n * iteratee shorthands.\n *\n * @private\n * @param {Array} [array] The array to iterate over.\n * @param {Function} predicate The function invoked per iteration.\n * @returns {Array} Returns the new filtered array.\n */\nfunction arrayFilter(array, predicate) {\n  var index = -1,\n      length = array == null ? 0 : array.length,\n      resIndex = 0,\n      result = [];\n\n  while (++index < length) {\n    var value = array[index];\n    if (predicate(value, index, array)) {\n      result[resIndex++] = value;\n    }\n  }\n  return result;\n}\n\nexport default arrayFilter;\n","/**\n * This method returns a new empty array.\n *\n * @static\n * @memberOf _\n * @since 4.13.0\n * @category Util\n * @returns {Array} Returns the new empty array.\n * @example\n *\n * var arrays = _.times(2, _.stubArray);\n *\n * console.log(arrays);\n * // => [[], []]\n *\n * console.log(arrays[0] === arrays[1]);\n * // => false\n */\nfunction stubArray() {\n  return [];\n}\n\nexport default stubArray;\n","import arrayFilter from './_arrayFilter.js';\nimport stubArray from './stubArray.js';\n\n/** Used for built-in method references. */\nvar objectProto = Object.prototype;\n\n/** Built-in value references. */\nvar propertyIsEnumerable = objectProto.propertyIsEnumerable;\n\n/* Built-in method references for those with the same name as other `lodash` methods. */\nvar nativeGetSymbols = Object.getOwnPropertySymbols;\n\n/**\n * Creates an array of the own enumerable symbols of `object`.\n *\n * @private\n * @param {Object} object The object to query.\n * @returns {Array} Returns the array of symbols.\n */\nvar getSymbols = !nativeGetSymbols ? stubArray : function(object) {\n  if (object == null) {\n    return [];\n  }\n  object = Object(object);\n  return arrayFilter(nativeGetSymbols(object), function(symbol) {\n    return propertyIsEnumerable.call(object, symbol);\n  });\n};\n\nexport default getSymbols;\n","import copyObject from './_copyObject.js';\nimport getSymbols from './_getSymbols.js';\n\n/**\n * Copies own symbols of `source` to `object`.\n *\n * @private\n * @param {Object} source The object to copy symbols from.\n * @param {Object} [object={}] The object to copy symbols to.\n * @returns {Object} Returns `object`.\n */\nfunction copySymbols(source, object) {\n  return copyObject(source, getSymbols(source), object);\n}\n\nexport default copySymbols;\n","/**\n * Appends the elements of `values` to `array`.\n *\n * @private\n * @param {Array} array The array to modify.\n * @param {Array} values The values to append.\n * @returns {Array} Returns `array`.\n */\nfunction arrayPush(array, values) {\n  var index = -1,\n      length = values.length,\n      offset = array.length;\n\n  while (++index < length) {\n    array[offset + index] = values[index];\n  }\n  return array;\n}\n\nexport default arrayPush;\n","import arrayPush from './_arrayPush.js';\nimport getPrototype from './_getPrototype.js';\nimport getSymbols from './_getSymbols.js';\nimport stubArray from './stubArray.js';\n\n/* Built-in method references for those with the same name as other `lodash` methods. */\nvar nativeGetSymbols = Object.getOwnPropertySymbols;\n\n/**\n * Creates an array of the own and inherited enumerable symbols of `object`.\n *\n * @private\n * @param {Object} object The object to query.\n * @returns {Array} Returns the array of symbols.\n */\nvar getSymbolsIn = !nativeGetSymbols ? stubArray : function(object) {\n  var result = [];\n  while (object) {\n    arrayPush(result, getSymbols(object));\n    object = getPrototype(object);\n  }\n  return result;\n};\n\nexport default getSymbolsIn;\n","import copyObject from './_copyObject.js';\nimport getSymbolsIn from './_getSymbolsIn.js';\n\n/**\n * Copies own and inherited symbols of `source` to `object`.\n *\n * @private\n * @param {Object} source The object to copy symbols from.\n * @param {Object} [object={}] The object to copy symbols to.\n * @returns {Object} Returns `object`.\n */\nfunction copySymbolsIn(source, object) {\n  return copyObject(source, getSymbolsIn(source), object);\n}\n\nexport default copySymbolsIn;\n","import arrayPush from './_arrayPush.js';\nimport isArray from './isArray.js';\n\n/**\n * The base implementation of `getAllKeys` and `getAllKeysIn` which uses\n * `keysFunc` and `symbolsFunc` to get the enumerable property names and\n * symbols of `object`.\n *\n * @private\n * @param {Object} object The object to query.\n * @param {Function} keysFunc The function to get the keys of `object`.\n * @param {Function} symbolsFunc The function to get the symbols of `object`.\n * @returns {Array} Returns the array of property names and symbols.\n */\nfunction baseGetAllKeys(object, keysFunc, symbolsFunc) {\n  var result = keysFunc(object);\n  return isArray(object) ? result : arrayPush(result, symbolsFunc(object));\n}\n\nexport default baseGetAllKeys;\n","import baseGetAllKeys from './_baseGetAllKeys.js';\nimport getSymbols from './_getSymbols.js';\nimport keys from './keys.js';\n\n/**\n * Creates an array of own enumerable property names and symbols of `object`.\n *\n * @private\n * @param {Object} object The object to query.\n * @returns {Array} Returns the array of property names and symbols.\n */\nfunction getAllKeys(object) {\n  return baseGetAllKeys(object, keys, getSymbols);\n}\n\nexport default getAllKeys;\n","import baseGetAllKeys from './_baseGetAllKeys.js';\nimport getSymbolsIn from './_getSymbolsIn.js';\nimport keysIn from './keysIn.js';\n\n/**\n * Creates an array of own and inherited enumerable property names and\n * symbols of `object`.\n *\n * @private\n * @param {Object} object The object to query.\n * @returns {Array} Returns the array of property names and symbols.\n */\nfunction getAllKeysIn(object) {\n  return baseGetAllKeys(object, keysIn, getSymbolsIn);\n}\n\nexport default getAllKeysIn;\n","import getNative from './_getNative.js';\nimport root from './_root.js';\n\n/* Built-in method references that are verified to be native. */\nvar DataView = getNative(root, 'DataView');\n\nexport default DataView;\n","import getNative from './_getNative.js';\nimport root from './_root.js';\n\n/* Built-in method references that are verified to be native. */\nvar Promise = getNative(root, 'Promise');\n\nexport default Promise;\n","import getNative from './_getNative.js';\nimport root from './_root.js';\n\n/* Built-in method references that are verified to be native. */\nvar Set = getNative(root, 'Set');\n\nexport default Set;\n","import getNative from './_getNative.js';\nimport root from './_root.js';\n\n/* Built-in method references that are verified to be native. */\nvar WeakMap = getNative(root, 'WeakMap');\n\nexport default WeakMap;\n","import DataView from './_DataView.js';\nimport Map from './_Map.js';\nimport Promise from './_Promise.js';\nimport Set from './_Set.js';\nimport WeakMap from './_WeakMap.js';\nimport baseGetTag from './_baseGetTag.js';\nimport toSource from './_toSource.js';\n\n/** `Object#toString` result references. */\nvar mapTag = '[object Map]',\n    objectTag = '[object Object]',\n    promiseTag = '[object Promise]',\n    setTag = '[object Set]',\n    weakMapTag = '[object WeakMap]';\n\nvar dataViewTag = '[object DataView]';\n\n/** Used to detect maps, sets, and weakmaps. */\nvar dataViewCtorString = toSource(DataView),\n    mapCtorString = toSource(Map),\n    promiseCtorString = toSource(Promise),\n    setCtorString = toSource(Set),\n    weakMapCtorString = toSource(WeakMap);\n\n/**\n * Gets the `toStringTag` of `value`.\n *\n * @private\n * @param {*} value The value to query.\n * @returns {string} Returns the `toStringTag`.\n */\nvar getTag = baseGetTag;\n\n// Fallback for data views, maps, sets, and weak maps in IE 11 and promises in Node.js < 6.\nif ((DataView && getTag(new DataView(new ArrayBuffer(1))) != dataViewTag) ||\n    (Map && getTag(new Map) != mapTag) ||\n    (Promise && getTag(Promise.resolve()) != promiseTag) ||\n    (Set && getTag(new Set) != setTag) ||\n    (WeakMap && getTag(new WeakMap) != weakMapTag)) {\n  getTag = function(value) {\n    var result = baseGetTag(value),\n        Ctor = result == objectTag ? value.constructor : undefined,\n        ctorString = Ctor ? toSource(Ctor) : '';\n\n    if (ctorString) {\n      switch (ctorString) {\n        case dataViewCtorString: return dataViewTag;\n        case mapCtorString: return mapTag;\n        case promiseCtorString: return promiseTag;\n        case setCtorString: return setTag;\n        case weakMapCtorString: return weakMapTag;\n      }\n    }\n    return result;\n  };\n}\n\nexport default getTag;\n","/** Used for built-in method references. */\nvar objectProto = Object.prototype;\n\n/** Used to check objects for own properties. */\nvar hasOwnProperty = objectProto.hasOwnProperty;\n\n/**\n * Initializes an array clone.\n *\n * @private\n * @param {Array} array The array to clone.\n * @returns {Array} Returns the initialized clone.\n */\nfunction initCloneArray(array) {\n  var length = array.length,\n      result = new array.constructor(length);\n\n  // Add properties assigned by `RegExp#exec`.\n  if (length && typeof array[0] == 'string' && hasOwnProperty.call(array, 'index')) {\n    result.index = array.index;\n    result.input = array.input;\n  }\n  return result;\n}\n\nexport default initCloneArray;\n","import root from './_root.js';\n\n/** Built-in value references. */\nvar Uint8Array = root.Uint8Array;\n\nexport default Uint8Array;\n","import Uint8Array from './_Uint8Array.js';\n\n/**\n * Creates a clone of `arrayBuffer`.\n *\n * @private\n * @param {ArrayBuffer} arrayBuffer The array buffer to clone.\n * @returns {ArrayBuffer} Returns the cloned array buffer.\n */\nfunction cloneArrayBuffer(arrayBuffer) {\n  var result = new arrayBuffer.constructor(arrayBuffer.byteLength);\n  new Uint8Array(result).set(new Uint8Array(arrayBuffer));\n  return result;\n}\n\nexport default cloneArrayBuffer;\n","import cloneArrayBuffer from './_cloneArrayBuffer.js';\n\n/**\n * Creates a clone of `dataView`.\n *\n * @private\n * @param {Object} dataView The data view to clone.\n * @param {boolean} [isDeep] Specify a deep clone.\n * @returns {Object} Returns the cloned data view.\n */\nfunction cloneDataView(dataView, isDeep) {\n  var buffer = isDeep ? cloneArrayBuffer(dataView.buffer) : dataView.buffer;\n  return new dataView.constructor(buffer, dataView.byteOffset, dataView.byteLength);\n}\n\nexport default cloneDataView;\n","/** Used to match `RegExp` flags from their coerced string values. */\nvar reFlags = /\\w*$/;\n\n/**\n * Creates a clone of `regexp`.\n *\n * @private\n * @param {Object} regexp The regexp to clone.\n * @returns {Object} Returns the cloned regexp.\n */\nfunction cloneRegExp(regexp) {\n  var result = new regexp.constructor(regexp.source, reFlags.exec(regexp));\n  result.lastIndex = regexp.lastIndex;\n  return result;\n}\n\nexport default cloneRegExp;\n","import Symbol from './_Symbol.js';\n\n/** Used to convert symbols to primitives and strings. */\nvar symbolProto = Symbol ? Symbol.prototype : undefined,\n    symbolValueOf = symbolProto ? symbolProto.valueOf : undefined;\n\n/**\n * Creates a clone of the `symbol` object.\n *\n * @private\n * @param {Object} symbol The symbol object to clone.\n * @returns {Object} Returns the cloned symbol object.\n */\nfunction cloneSymbol(symbol) {\n  return symbolValueOf ? Object(symbolValueOf.call(symbol)) : {};\n}\n\nexport default cloneSymbol;\n","import cloneArrayBuffer from './_cloneArrayBuffer.js';\n\n/**\n * Creates a clone of `typedArray`.\n *\n * @private\n * @param {Object} typedArray The typed array to clone.\n * @param {boolean} [isDeep] Specify a deep clone.\n * @returns {Object} Returns the cloned typed array.\n */\nfunction cloneTypedArray(typedArray, isDeep) {\n  var buffer = isDeep ? cloneArrayBuffer(typedArray.buffer) : typedArray.buffer;\n  return new typedArray.constructor(buffer, typedArray.byteOffset, typedArray.length);\n}\n\nexport default cloneTypedArray;\n","import cloneArrayBuffer from './_cloneArrayBuffer.js';\nimport cloneDataView from './_cloneDataView.js';\nimport cloneRegExp from './_cloneRegExp.js';\nimport cloneSymbol from './_cloneSymbol.js';\nimport cloneTypedArray from './_cloneTypedArray.js';\n\n/** `Object#toString` result references. */\nvar boolTag = '[object Boolean]',\n    dateTag = '[object Date]',\n    mapTag = '[object Map]',\n    numberTag = '[object Number]',\n    regexpTag = '[object RegExp]',\n    setTag = '[object Set]',\n    stringTag = '[object String]',\n    symbolTag = '[object Symbol]';\n\nvar arrayBufferTag = '[object ArrayBuffer]',\n    dataViewTag = '[object DataView]',\n    float32Tag = '[object Float32Array]',\n    float64Tag = '[object Float64Array]',\n    int8Tag = '[object Int8Array]',\n    int16Tag = '[object Int16Array]',\n    int32Tag = '[object Int32Array]',\n    uint8Tag = '[object Uint8Array]',\n    uint8ClampedTag = '[object Uint8ClampedArray]',\n    uint16Tag = '[object Uint16Array]',\n    uint32Tag = '[object Uint32Array]';\n\n/**\n * Initializes an object clone based on its `toStringTag`.\n *\n * **Note:** This function only supports cloning values with tags of\n * `Boolean`, `Date`, `Error`, `Map`, `Number`, `RegExp`, `Set`, or `String`.\n *\n * @private\n * @param {Object} object The object to clone.\n * @param {string} tag The `toStringTag` of the object to clone.\n * @param {boolean} [isDeep] Specify a deep clone.\n * @returns {Object} Returns the initialized clone.\n */\nfunction initCloneByTag(object, tag, isDeep) {\n  var Ctor = object.constructor;\n  switch (tag) {\n    case arrayBufferTag:\n      return cloneArrayBuffer(object);\n\n    case boolTag:\n    case dateTag:\n      return new Ctor(+object);\n\n    case dataViewTag:\n      return cloneDataView(object, isDeep);\n\n    case float32Tag: case float64Tag:\n    case int8Tag: case int16Tag: case int32Tag:\n    case uint8Tag: case uint8ClampedTag: case uint16Tag: case uint32Tag:\n      return cloneTypedArray(object, isDeep);\n\n    case mapTag:\n      return new Ctor;\n\n    case numberTag:\n    case stringTag:\n      return new Ctor(object);\n\n    case regexpTag:\n      return cloneRegExp(object);\n\n    case setTag:\n      return new Ctor;\n\n    case symbolTag:\n      return cloneSymbol(object);\n  }\n}\n\nexport default initCloneByTag;\n","import isObject from './isObject.js';\n\n/** Built-in value references. */\nvar objectCreate = Object.create;\n\n/**\n * The base implementation of `_.create` without support for assigning\n * properties to the created object.\n *\n * @private\n * @param {Object} proto The object to inherit from.\n * @returns {Object} Returns the new object.\n */\nvar baseCreate = (function() {\n  function object() {}\n  return function(proto) {\n    if (!isObject(proto)) {\n      return {};\n    }\n    if (objectCreate) {\n      return objectCreate(proto);\n    }\n    object.prototype = proto;\n    var result = new object;\n    object.prototype = undefined;\n    return result;\n  };\n}());\n\nexport default baseCreate;\n","import baseCreate from './_baseCreate.js';\nimport getPrototype from './_getPrototype.js';\nimport isPrototype from './_isPrototype.js';\n\n/**\n * Initializes an object clone.\n *\n * @private\n * @param {Object} object The object to clone.\n * @returns {Object} Returns the initialized clone.\n */\nfunction initCloneObject(object) {\n  return (typeof object.constructor == 'function' && !isPrototype(object))\n    ? baseCreate(getPrototype(object))\n    : {};\n}\n\nexport default initCloneObject;\n","import getTag from './_getTag.js';\nimport isObjectLike from './isObjectLike.js';\n\n/** `Object#toString` result references. */\nvar mapTag = '[object Map]';\n\n/**\n * The base implementation of `_.isMap` without Node.js optimizations.\n *\n * @private\n * @param {*} value The value to check.\n * @returns {boolean} Returns `true` if `value` is a map, else `false`.\n */\nfunction baseIsMap(value) {\n  return isObjectLike(value) && getTag(value) == mapTag;\n}\n\nexport default baseIsMap;\n","import baseIsMap from './_baseIsMap.js';\nimport baseUnary from './_baseUnary.js';\nimport nodeUtil from './_nodeUtil.js';\n\n/* Node.js helper references. */\nvar nodeIsMap = nodeUtil && nodeUtil.isMap;\n\n/**\n * Checks if `value` is classified as a `Map` object.\n *\n * @static\n * @memberOf _\n * @since 4.3.0\n * @category Lang\n * @param {*} value The value to check.\n * @returns {boolean} Returns `true` if `value` is a map, else `false`.\n * @example\n *\n * _.isMap(new Map);\n * // => true\n *\n * _.isMap(new WeakMap);\n * // => false\n */\nvar isMap = nodeIsMap ? baseUnary(nodeIsMap) : baseIsMap;\n\nexport default isMap;\n","import getTag from './_getTag.js';\nimport isObjectLike from './isObjectLike.js';\n\n/** `Object#toString` result references. */\nvar setTag = '[object Set]';\n\n/**\n * The base implementation of `_.isSet` without Node.js optimizations.\n *\n * @private\n * @param {*} value The value to check.\n * @returns {boolean} Returns `true` if `value` is a set, else `false`.\n */\nfunction baseIsSet(value) {\n  return isObjectLike(value) && getTag(value) == setTag;\n}\n\nexport default baseIsSet;\n","import baseIsSet from './_baseIsSet.js';\nimport baseUnary from './_baseUnary.js';\nimport nodeUtil from './_nodeUtil.js';\n\n/* Node.js helper references. */\nvar nodeIsSet = nodeUtil && nodeUtil.isSet;\n\n/**\n * Checks if `value` is classified as a `Set` object.\n *\n * @static\n * @memberOf _\n * @since 4.3.0\n * @category Lang\n * @param {*} value The value to check.\n * @returns {boolean} Returns `true` if `value` is a set, else `false`.\n * @example\n *\n * _.isSet(new Set);\n * // => true\n *\n * _.isSet(new WeakSet);\n * // => false\n */\nvar isSet = nodeIsSet ? baseUnary(nodeIsSet) : baseIsSet;\n\nexport default isSet;\n","import Stack from './_Stack.js';\nimport arrayEach from './_arrayEach.js';\nimport assignValue from './_assignValue.js';\nimport baseAssign from './_baseAssign.js';\nimport baseAssignIn from './_baseAssignIn.js';\nimport cloneBuffer from './_cloneBuffer.js';\nimport copyArray from './_copyArray.js';\nimport copySymbols from './_copySymbols.js';\nimport copySymbolsIn from './_copySymbolsIn.js';\nimport getAllKeys from './_getAllKeys.js';\nimport getAllKeysIn from './_getAllKeysIn.js';\nimport getTag from './_getTag.js';\nimport initCloneArray from './_initCloneArray.js';\nimport initCloneByTag from './_initCloneByTag.js';\nimport initCloneObject from './_initCloneObject.js';\nimport isArray from './isArray.js';\nimport isBuffer from './isBuffer.js';\nimport isMap from './isMap.js';\nimport isObject from './isObject.js';\nimport isSet from './isSet.js';\nimport keys from './keys.js';\nimport keysIn from './keysIn.js';\n\n/** Used to compose bitmasks for cloning. */\nvar CLONE_DEEP_FLAG = 1,\n    CLONE_FLAT_FLAG = 2,\n    CLONE_SYMBOLS_FLAG = 4;\n\n/** `Object#toString` result references. */\nvar argsTag = '[object Arguments]',\n    arrayTag = '[object Array]',\n    boolTag = '[object Boolean]',\n    dateTag = '[object Date]',\n    errorTag = '[object Error]',\n    funcTag = '[object Function]',\n    genTag = '[object GeneratorFunction]',\n    mapTag = '[object Map]',\n    numberTag = '[object Number]',\n    objectTag = '[object Object]',\n    regexpTag = '[object RegExp]',\n    setTag = '[object Set]',\n    stringTag = '[object String]',\n    symbolTag = '[object Symbol]',\n    weakMapTag = '[object WeakMap]';\n\nvar arrayBufferTag = '[object ArrayBuffer]',\n    dataViewTag = '[object DataView]',\n    float32Tag = '[object Float32Array]',\n    float64Tag = '[object Float64Array]',\n    int8Tag = '[object Int8Array]',\n    int16Tag = '[object Int16Array]',\n    int32Tag = '[object Int32Array]',\n    uint8Tag = '[object Uint8Array]',\n    uint8ClampedTag = '[object Uint8ClampedArray]',\n    uint16Tag = '[object Uint16Array]',\n    uint32Tag = '[object Uint32Array]';\n\n/** Used to identify `toStringTag` values supported by `_.clone`. */\nvar cloneableTags = {};\ncloneableTags[argsTag] = cloneableTags[arrayTag] =\ncloneableTags[arrayBufferTag] = cloneableTags[dataViewTag] =\ncloneableTags[boolTag] = cloneableTags[dateTag] =\ncloneableTags[float32Tag] = cloneableTags[float64Tag] =\ncloneableTags[int8Tag] = cloneableTags[int16Tag] =\ncloneableTags[int32Tag] = cloneableTags[mapTag] =\ncloneableTags[numberTag] = cloneableTags[objectTag] =\ncloneableTags[regexpTag] = cloneableTags[setTag] =\ncloneableTags[stringTag] = cloneableTags[symbolTag] =\ncloneableTags[uint8Tag] = cloneableTags[uint8ClampedTag] =\ncloneableTags[uint16Tag] = cloneableTags[uint32Tag] = true;\ncloneableTags[errorTag] = cloneableTags[funcTag] =\ncloneableTags[weakMapTag] = false;\n\n/**\n * The base implementation of `_.clone` and `_.cloneDeep` which tracks\n * traversed objects.\n *\n * @private\n * @param {*} value The value to clone.\n * @param {boolean} bitmask The bitmask flags.\n *  1 - Deep clone\n *  2 - Flatten inherited properties\n *  4 - Clone symbols\n * @param {Function} [customizer] The function to customize cloning.\n * @param {string} [key] The key of `value`.\n * @param {Object} [object] The parent object of `value`.\n * @param {Object} [stack] Tracks traversed objects and their clone counterparts.\n * @returns {*} Returns the cloned value.\n */\nfunction baseClone(value, bitmask, customizer, key, object, stack) {\n  var result,\n      isDeep = bitmask & CLONE_DEEP_FLAG,\n      isFlat = bitmask & CLONE_FLAT_FLAG,\n      isFull = bitmask & CLONE_SYMBOLS_FLAG;\n\n  if (customizer) {\n    result = object ? customizer(value, key, object, stack) : customizer(value);\n  }\n  if (result !== undefined) {\n    return result;\n  }\n  if (!isObject(value)) {\n    return value;\n  }\n  var isArr = isArray(value);\n  if (isArr) {\n    result = initCloneArray(value);\n    if (!isDeep) {\n      return copyArray(value, result);\n    }\n  } else {\n    var tag = getTag(value),\n        isFunc = tag == funcTag || tag == genTag;\n\n    if (isBuffer(value)) {\n      return cloneBuffer(value, isDeep);\n    }\n    if (tag == objectTag || tag == argsTag || (isFunc && !object)) {\n      result = (isFlat || isFunc) ? {} : initCloneObject(value);\n      if (!isDeep) {\n        return isFlat\n          ? copySymbolsIn(value, baseAssignIn(result, value))\n          : copySymbols(value, baseAssign(result, value));\n      }\n    } else {\n      if (!cloneableTags[tag]) {\n        return object ? value : {};\n      }\n      result = initCloneByTag(value, tag, isDeep);\n    }\n  }\n  // Check for circular references and return its corresponding clone.\n  stack || (stack = new Stack);\n  var stacked = stack.get(value);\n  if (stacked) {\n    return stacked;\n  }\n  stack.set(value, result);\n\n  if (isSet(value)) {\n    value.forEach(function(subValue) {\n      result.add(baseClone(subValue, bitmask, customizer, subValue, value, stack));\n    });\n  } else if (isMap(value)) {\n    value.forEach(function(subValue, key) {\n      result.set(key, baseClone(subValue, bitmask, customizer, key, value, stack));\n    });\n  }\n\n  var keysFunc = isFull\n    ? (isFlat ? getAllKeysIn : getAllKeys)\n    : (isFlat ? keysIn : keys);\n\n  var props = isArr ? undefined : keysFunc(value);\n  arrayEach(props || value, function(subValue, key) {\n    if (props) {\n      key = subValue;\n      subValue = value[key];\n    }\n    // Recursively populate clone (susceptible to call stack limits).\n    assignValue(result, key, baseClone(subValue, bitmask, customizer, key, value, stack));\n  });\n  return result;\n}\n\nexport default baseClone;\n","import baseClone from './_baseClone.js';\n\n/** Used to compose bitmasks for cloning. */\nvar CLONE_DEEP_FLAG = 1,\n    CLONE_SYMBOLS_FLAG = 4;\n\n/**\n * This method is like `_.cloneWith` except that it recursively clones `value`.\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category Lang\n * @param {*} value The value to recursively clone.\n * @param {Function} [customizer] The function to customize cloning.\n * @returns {*} Returns the deep cloned value.\n * @see _.cloneWith\n * @example\n *\n * function customizer(value) {\n *   if (_.isElement(value)) {\n *     return value.cloneNode(true);\n *   }\n * }\n *\n * var el = _.cloneDeepWith(document.body, customizer);\n *\n * console.log(el === document.body);\n * // => false\n * console.log(el.nodeName);\n * // => 'BODY'\n * console.log(el.childNodes.length);\n * // => 20\n */\nfunction cloneDeepWith(value, customizer) {\n  customizer = typeof customizer == 'function' ? customizer : undefined;\n  return baseClone(value, CLONE_DEEP_FLAG | CLONE_SYMBOLS_FLAG, customizer);\n}\n\nexport default cloneDeepWith;\n","import isObjectLike from './isObjectLike.js';\nimport isPlainObject from './isPlainObject.js';\n\n/**\n * Checks if `value` is likely a DOM element.\n *\n * @static\n * @memberOf _\n * @since 0.1.0\n * @category Lang\n * @param {*} value The value to check.\n * @returns {boolean} Returns `true` if `value` is a DOM element, else `false`.\n * @example\n *\n * _.isElement(document.body);\n * // => true\n *\n * _.isElement('<body>');\n * // => false\n */\nfunction isElement(value) {\n  return isObjectLike(value) && value.nodeType === 1 && !isPlainObject(value);\n}\n\nexport default isElement;\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module utils/config\n */\n\nimport { isPlainObject, isElement, cloneDeepWith } from 'lodash-es';\n\n/**\n * Handles a configuration dictionary.\n */\nexport default class Config {\n\t/**\n\t * Creates an instance of the {@link ~Config} class.\n\t *\n\t * @param {Object} [configurations] The initial configurations to be set. Usually, provided by the user.\n\t * @param {Object} [defaultConfigurations] The default configurations. Usually, provided by the system.\n\t */\n\tconstructor( configurations, defaultConfigurations ) {\n\t\t/**\n\t\t * Store for the whole configuration.\n\t\t *\n\t\t * @private\n\t\t * @member {Object}\n\t\t */\n\t\tthis._config = {};\n\n\t\t// Set default configuration.\n\t\tif ( defaultConfigurations ) {\n\t\t\t// Clone the configuration to make sure that the properties will not be shared\n\t\t\t// between editors and make the watchdog feature work correctly.\n\t\t\tthis.define( cloneConfig( defaultConfigurations ) );\n\t\t}\n\n\t\t// Set initial configuration.\n\t\tif ( configurations ) {\n\t\t\tthis._setObjectToTarget( this._config, configurations );\n\t\t}\n\t}\n\n\t/**\n\t * Set configuration values.\n\t *\n\t * It accepts both a name/value pair or an object, which properties and values will be used to set\n\t * configurations.\n\t *\n\t * It also accepts setting a \"deep configuration\" by using dots in the name. For example, `'resize.width'` sets\n\t * the value for the `width` configuration in the `resize` subset.\n\t *\n\t *\t\tconfig.set( 'width', 500 );\n\t *\t\tconfig.set( 'toolbar.collapsed', true );\n\t *\n\t *\t\t// Equivalent to:\n\t *\t\tconfig.set( {\n\t *\t\t\twidth: 500\n\t *\t\t\ttoolbar: {\n\t *\t\t\t\tcollapsed: true\n\t *\t\t\t}\n\t *\t\t} );\n\t *\n\t * Passing an object as the value will amend the configuration, not replace it.\n\t *\n\t *\t\tconfig.set( 'toolbar', {\n\t *\t\t\tcollapsed: true,\n\t *\t\t} );\n\t *\n\t *\t\tconfig.set( 'toolbar', {\n\t *\t\t\tcolor: 'red',\n\t *\t\t} );\n\t *\n\t *\t\tconfig.get( 'toolbar.collapsed' ); // true\n\t *\t\tconfig.get( 'toolbar.color' ); // 'red'\n\t *\n\t * @param {String|Object} name The configuration name or an object from which take properties as\n\t * configuration entries. Configuration names are case-sensitive.\n\t * @param {*} value The configuration value. Used if a name is passed.\n\t */\n\tset( name, value ) {\n\t\tthis._setToTarget( this._config, name, value );\n\t}\n\n\t/**\n\t * Does exactly the same as {@link #set} with one exception – passed configuration extends\n\t * existing one, but does not overwrite already defined values.\n\t *\n\t * This method is supposed to be called by plugin developers to setup plugin's configurations. It would be\n\t * rarely used for other needs.\n\t *\n\t * @param {String|Object} name The configuration name or an object from which take properties as\n\t * configuration entries. Configuration names are case-sensitive.\n\t * @param {*} value The configuration value. Used if a name is passed.\n\t */\n\tdefine( name, value ) {\n\t\tconst isDefine = true;\n\n\t\tthis._setToTarget( this._config, name, value, isDefine );\n\t}\n\n\t/**\n\t * Gets the value for a configuration entry.\n\t *\n\t *\t\tconfig.get( 'name' );\n\t *\n\t * Deep configurations can be retrieved by separating each part with a dot.\n\t *\n\t *\t\tconfig.get( 'toolbar.collapsed' );\n\t *\n\t * @param {String} name The configuration name. Configuration names are case-sensitive.\n\t * @returns {*} The configuration value or `undefined` if the configuration entry was not found.\n\t */\n\tget( name ) {\n\t\treturn this._getFromSource( this._config, name );\n\t}\n\n\t/**\n\t * Iterates over all top level configuration names.\n\t *\n\t * @returns {Iterable.<String>}\n\t */\n\t* names() {\n\t\tfor ( const name of Object.keys( this._config ) ) {\n\t\t\tyield name;\n\t\t}\n\t}\n\n\t/**\n\t * Saves passed configuration to the specified target (nested object).\n\t *\n\t * @private\n\t * @param {Object} target Nested config object.\n\t * @param {String|Object} name The configuration name or an object from which take properties as\n\t * configuration entries. Configuration names are case-sensitive.\n\t * @param {*} value The configuration value. Used if a name is passed.\n\t * @param {Boolean} [isDefine=false] Define if passed configuration should overwrite existing one.\n\t */\n\t_setToTarget( target, name, value, isDefine = false ) {\n\t\t// In case of an object, iterate through it and call `_setToTarget` again for each property.\n\t\tif ( isPlainObject( name ) ) {\n\t\t\tthis._setObjectToTarget( target, name, isDefine );\n\n\t\t\treturn;\n\t\t}\n\n\t\t// The configuration name should be split into parts if it has dots. E.g. `resize.width` -> [`resize`, `width`].\n\t\tconst parts = name.split( '.' );\n\n\t\t// Take the name of the configuration out of the parts. E.g. `resize.width` -> `width`.\n\t\tname = parts.pop();\n\n\t\t// Iterate over parts to check if currently stored configuration has proper structure.\n\t\tfor ( const part of parts ) {\n\t\t\t// If there is no object for specified part then create one.\n\t\t\tif ( !isPlainObject( target[ part ] ) ) {\n\t\t\t\ttarget[ part ] = {};\n\t\t\t}\n\n\t\t\t// Nested object becomes a target.\n\t\t\ttarget = target[ part ];\n\t\t}\n\n\t\t// In case of value is an object.\n\t\tif ( isPlainObject( value ) ) {\n\t\t\t// We take care of proper config structure.\n\t\t\tif ( !isPlainObject( target[ name ] ) ) {\n\t\t\t\ttarget[ name ] = {};\n\t\t\t}\n\n\t\t\ttarget = target[ name ];\n\n\t\t\t// And iterate through this object calling `_setToTarget` again for each property.\n\t\t\tthis._setObjectToTarget( target, value, isDefine );\n\n\t\t\treturn;\n\t\t}\n\n\t\t// Do nothing if we are defining configuration for non empty name.\n\t\tif ( isDefine && typeof target[ name ] != 'undefined' ) {\n\t\t\treturn;\n\t\t}\n\n\t\ttarget[ name ] = value;\n\t}\n\n\t/**\n\t * Get specified configuration from specified source (nested object).\n\t *\n\t * @private\n\t * @param {Object} source level of nested object.\n\t * @param {String} name The configuration name. Configuration names are case-sensitive.\n\t * @returns {*} The configuration value or `undefined` if the configuration entry was not found.\n\t */\n\t_getFromSource( source, name ) {\n\t\t// The configuration name should be split into parts if it has dots. E.g. `resize.width` -> [`resize`, `width`].\n\t\tconst parts = name.split( '.' );\n\n\t\t// Take the name of the configuration out of the parts. E.g. `resize.width` -> `width`.\n\t\tname = parts.pop();\n\n\t\t// Iterate over parts to check if currently stored configuration has proper structure.\n\t\tfor ( const part of parts ) {\n\t\t\tif ( !isPlainObject( source[ part ] ) ) {\n\t\t\t\tsource = null;\n\t\t\t\tbreak;\n\t\t\t}\n\n\t\t\t// Nested object becomes a source.\n\t\t\tsource = source[ part ];\n\t\t}\n\n\t\t// Always returns undefined for non existing configuration.\n\t\treturn source ? cloneConfig( source[ name ] ) : undefined;\n\t}\n\n\t/**\n\t * Iterates through passed object and calls {@link #_setToTarget} method with object key and value for each property.\n\t *\n\t * @private\n\t * @param {Object} target Nested config object.\n\t * @param {Object} configuration Configuration data set\n\t * @param {Boolean} [isDefine] Defines if passed configuration is default configuration or not.\n\t */\n\t_setObjectToTarget( target, configuration, isDefine ) {\n\t\tObject.keys( configuration ).forEach( key => {\n\t\t\tthis._setToTarget( target, key, configuration[ key ], isDefine );\n\t\t} );\n\t}\n}\n\n// Clones configuration object or value.\n// @param {*} source Source configuration\n// @returns {*} Cloned configuration value.\nfunction cloneConfig( source ) {\n\treturn cloneDeepWith( source, leaveDOMReferences );\n}\n\n// A customized function for cloneDeepWith.\n// It will leave references to DOM Elements instead of cloning them.\n//\n// @param {*} value\n// @returns {Element|undefined}\nfunction leaveDOMReferences( value ) {\n\treturn isElement( value ) ? value : undefined;\n}\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module utils/spy\n */\n\n/**\n * Creates a spy function (ala Sinon.js) that can be used to inspect call to it.\n *\n * The following are the present features:\n *\n * * spy.called: property set to `true` if the function has been called at least once.\n *\n * @returns {Function} The spy function.\n */\nfunction spy() {\n\treturn function spy() {\n\t\tspy.called = true;\n\t};\n}\n\nexport default spy;\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module utils/eventinfo\n */\n\nimport spy from './spy';\n\n/**\n * The event object passed to event callbacks. It is used to provide information about the event as well as a tool to\n * manipulate it.\n */\nexport default class EventInfo {\n\t/**\n\t * @param {Object} source The emitter.\n\t * @param {String} name The event name.\n\t */\n\tconstructor( source, name ) {\n\t\t/**\n\t\t * The object that fired the event.\n\t\t *\n\t\t * @readonly\n\t\t * @member {Object}\n\t\t */\n\t\tthis.source = source;\n\n\t\t/**\n\t\t * The event name.\n\t\t *\n\t\t * @readonly\n\t\t * @member {String}\n\t\t */\n\t\tthis.name = name;\n\n\t\t/**\n\t\t * Path this event has followed. See {@link module:utils/emittermixin~EmitterMixin#delegate}.\n\t\t *\n\t\t * @readonly\n\t\t * @member {Array.<Object>}\n\t\t */\n\t\tthis.path = [];\n\n\t\t// The following methods are defined in the constructor because they must be re-created per instance.\n\n\t\t/**\n\t\t * Stops the event emitter to call further callbacks for this event interaction.\n\t\t *\n\t\t * @method #stop\n\t\t */\n\t\tthis.stop = spy();\n\n\t\t/**\n\t\t * Removes the current callback from future interactions of this event.\n\t\t *\n\t\t * @method #off\n\t\t */\n\t\tthis.off = spy();\n\n\t\t/**\n\t\t * The value which will be returned by {@link module:utils/emittermixin~EmitterMixin#fire}.\n\t\t *\n\t\t * It's `undefined` by default and can be changed by an event listener:\n\t\t *\n\t\t *\t\tdataController.fire( 'getSelectedContent', ( evt ) => {\n\t\t *\t\t\t// This listener will make `dataController.fire( 'getSelectedContent' )`\n\t\t *\t\t\t// always return an empty DocumentFragment.\n\t\t *\t\t\tevt.return = new DocumentFragment();\n\t\t *\n\t\t *\t\t\t// Make sure no other listeners are executed.\n\t\t *\t\t\tevt.stop();\n\t\t *\t\t} );\n\t\t *\n\t\t * @member #return\n\t\t */\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module utils/uid\n */\n\n// A hash table of hex numbers to avoid using toString() in uid() which is costly.\n// [ '00', '01', '02', ..., 'fe', 'ff' ]\nconst HEX_NUMBERS = new Array( 256 ).fill()\n\t.map( ( val, index ) => ( '0' + ( index ).toString( 16 ) ).slice( -2 ) );\n\n/**\n * Returns a unique id. The id starts with an \"e\" character and a randomly generated string of\n * 32 alphanumeric characters.\n *\n * **Note**: The characters the unique id is built from correspond to the hex number notation\n * (from \"0\" to \"9\", from \"a\" to \"f\"). In other words, each id corresponds to an \"e\" followed\n * by 16 8-bit numbers next to each other.\n *\n * @returns {String} An unique id string.\n */\nexport default function uid() {\n\t// Let's create some positive random 32bit integers first.\n\t//\n\t// 1. Math.random() is a float between 0 and 1.\n\t// 2. 0x100000000 is 2^32 = 4294967296.\n\t// 3. >>> 0 enforces integer (in JS all numbers are floating point).\n\t//\n\t// For instance:\n\t//\t\tMath.random() * 0x100000000 = 3366450031.853859\n\t// but\n\t//\t\tMath.random() * 0x100000000 >>> 0 = 3366450031.\n\tconst r1 = Math.random() * 0x100000000 >>> 0;\n\tconst r2 = Math.random() * 0x100000000 >>> 0;\n\tconst r3 = Math.random() * 0x100000000 >>> 0;\n\tconst r4 = Math.random() * 0x100000000 >>> 0;\n\n\t// Make sure that id does not start with number.\n\treturn 'e' +\n\t\tHEX_NUMBERS[ r1 >> 0 & 0xFF ] +\n\t\tHEX_NUMBERS[ r1 >> 8 & 0xFF ] +\n\t\tHEX_NUMBERS[ r1 >> 16 & 0xFF ] +\n\t\tHEX_NUMBERS[ r1 >> 24 & 0xFF ] +\n\t\tHEX_NUMBERS[ r2 >> 0 & 0xFF ] +\n\t\tHEX_NUMBERS[ r2 >> 8 & 0xFF ] +\n\t\tHEX_NUMBERS[ r2 >> 16 & 0xFF ] +\n\t\tHEX_NUMBERS[ r2 >> 24 & 0xFF ] +\n\t\tHEX_NUMBERS[ r3 >> 0 & 0xFF ] +\n\t\tHEX_NUMBERS[ r3 >> 8 & 0xFF ] +\n\t\tHEX_NUMBERS[ r3 >> 16 & 0xFF ] +\n\t\tHEX_NUMBERS[ r3 >> 24 & 0xFF ] +\n\t\tHEX_NUMBERS[ r4 >> 0 & 0xFF ] +\n\t\tHEX_NUMBERS[ r4 >> 8 & 0xFF ] +\n\t\tHEX_NUMBERS[ r4 >> 16 & 0xFF ] +\n\t\tHEX_NUMBERS[ r4 >> 24 & 0xFF ];\n}\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module utils/priorities\n */\n\n/**\n * String representing a priority value.\n *\n * @typedef {'highest'|'high'|'normal'|'low'|'lowest'} module:utils/priorities~PriorityString\n */\n\n/**\n * Provides group of constants to use instead of hardcoding numeric priority values.\n *\n * @namespace\n */\nconst priorities = {\n\t/**\n\t * Converts a string with priority name to it's numeric value. If `Number` is given, it just returns it.\n\t *\n\t * @static\n\t * @param {module:utils/priorities~PriorityString|Number} priority Priority to convert.\n\t * @returns {Number} Converted priority.\n\t */\n\tget( priority ) {\n\t\tif ( typeof priority != 'number' ) {\n\t\t\treturn this[ priority ] || this.normal;\n\t\t} else {\n\t\t\treturn priority;\n\t\t}\n\t},\n\n\thighest: 100000,\n\thigh: 1000,\n\tnormal: 0,\n\tlow: -1000,\n\tlowest: -100000\n};\n\nexport default priorities;\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module utils/emittermixin\n */\n\nimport EventInfo from './eventinfo';\nimport uid from './uid';\nimport priorities from './priorities';\n\n// To check if component is loaded more than once.\nimport './version';\nimport CKEditorError from './ckeditorerror';\n\nconst _listeningTo = Symbol( 'listeningTo' );\nconst _emitterId = Symbol( 'emitterId' );\n\n/**\n * Mixin that injects the {@link ~Emitter events API} into its host.\n *\n * @mixin EmitterMixin\n * @implements module:utils/emittermixin~Emitter\n */\nconst EmitterMixin = {\n\t/**\n\t * @inheritDoc\n\t */\n\ton( event, callback, options = {} ) {\n\t\tthis.listenTo( this, event, callback, options );\n\t},\n\n\t/**\n\t * @inheritDoc\n\t */\n\tonce( event, callback, options ) {\n\t\tlet wasFired = false;\n\n\t\tconst onceCallback = function( event, ...args ) {\n\t\t\t// Ensure the callback is called only once even if the callback itself leads to re-firing the event\n\t\t\t// (which would call the callback again).\n\t\t\tif ( !wasFired ) {\n\t\t\t\twasFired = true;\n\n\t\t\t\t// Go off() at the first call.\n\t\t\t\tevent.off();\n\n\t\t\t\t// Go with the original callback.\n\t\t\t\tcallback.call( this, event, ...args );\n\t\t\t}\n\t\t};\n\n\t\t// Make a similar on() call, simply replacing the callback.\n\t\tthis.listenTo( this, event, onceCallback, options );\n\t},\n\n\t/**\n\t * @inheritDoc\n\t */\n\toff( event, callback ) {\n\t\tthis.stopListening( this, event, callback );\n\t},\n\n\t/**\n\t * @inheritDoc\n\t */\n\tlistenTo( emitter, event, callback, options = {} ) {\n\t\tlet emitterInfo, eventCallbacks;\n\n\t\t// _listeningTo contains a list of emitters that this object is listening to.\n\t\t// This list has the following format:\n\t\t//\n\t\t// _listeningTo: {\n\t\t//     emitterId: {\n\t\t//         emitter: emitter,\n\t\t//         callbacks: {\n\t\t//             event1: [ callback1, callback2, ... ]\n\t\t//             ....\n\t\t//         }\n\t\t//     },\n\t\t//     ...\n\t\t// }\n\n\t\tif ( !this[ _listeningTo ] ) {\n\t\t\tthis[ _listeningTo ] = {};\n\t\t}\n\n\t\tconst emitters = this[ _listeningTo ];\n\n\t\tif ( !_getEmitterId( emitter ) ) {\n\t\t\t_setEmitterId( emitter );\n\t\t}\n\n\t\tconst emitterId = _getEmitterId( emitter );\n\n\t\tif ( !( emitterInfo = emitters[ emitterId ] ) ) {\n\t\t\temitterInfo = emitters[ emitterId ] = {\n\t\t\t\temitter,\n\t\t\t\tcallbacks: {}\n\t\t\t};\n\t\t}\n\n\t\tif ( !( eventCallbacks = emitterInfo.callbacks[ event ] ) ) {\n\t\t\teventCallbacks = emitterInfo.callbacks[ event ] = [];\n\t\t}\n\n\t\teventCallbacks.push( callback );\n\n\t\t// Finally register the callback to the event.\n\t\tcreateEventNamespace( emitter, event );\n\t\tconst lists = getCallbacksListsForNamespace( emitter, event );\n\t\tconst priority = priorities.get( options.priority );\n\n\t\tconst callbackDefinition = {\n\t\t\tcallback,\n\t\t\tpriority\n\t\t};\n\n\t\t// Add the callback to all callbacks list.\n\t\tfor ( const callbacks of lists ) {\n\t\t\t// Add the callback to the list in the right priority position.\n\t\t\tlet added = false;\n\n\t\t\tfor ( let i = 0; i < callbacks.length; i++ ) {\n\t\t\t\tif ( callbacks[ i ].priority < priority ) {\n\t\t\t\t\tcallbacks.splice( i, 0, callbackDefinition );\n\t\t\t\t\tadded = true;\n\n\t\t\t\t\tbreak;\n\t\t\t\t}\n\t\t\t}\n\n\t\t\t// Add at the end, if right place was not found.\n\t\t\tif ( !added ) {\n\t\t\t\tcallbacks.push( callbackDefinition );\n\t\t\t}\n\t\t}\n\t},\n\n\t/**\n\t * @inheritDoc\n\t */\n\tstopListening( emitter, event, callback ) {\n\t\tconst emitters = this[ _listeningTo ];\n\t\tlet emitterId = emitter && _getEmitterId( emitter );\n\t\tconst emitterInfo = emitters && emitterId && emitters[ emitterId ];\n\t\tconst eventCallbacks = emitterInfo && event && emitterInfo.callbacks[ event ];\n\n\t\t// Stop if nothing has been listened.\n\t\tif ( !emitters || ( emitter && !emitterInfo ) || ( event && !eventCallbacks ) ) {\n\t\t\treturn;\n\t\t}\n\n\t\t// All params provided. off() that single callback.\n\t\tif ( callback ) {\n\t\t\tremoveCallback( emitter, event, callback );\n\n\t\t\t// We must remove callbacks as well in order to prevent memory leaks.\n\t\t\t// See https://github.com/ckeditor/ckeditor5/pull/8480\n\t\t\tconst index = eventCallbacks.indexOf( callback );\n\n\t\t\tif ( index !== -1 ) {\n\t\t\t\tif ( eventCallbacks.length === 1 ) {\n\t\t\t\t\tdelete emitterInfo.callbacks[ event ];\n\t\t\t\t} else {\n\t\t\t\t\tremoveCallback( emitter, event, callback );\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\t\t// Only `emitter` and `event` provided. off() all callbacks for that event.\n\t\telse if ( eventCallbacks ) {\n\t\t\twhile ( ( callback = eventCallbacks.pop() ) ) {\n\t\t\t\tremoveCallback( emitter, event, callback );\n\t\t\t}\n\n\t\t\tdelete emitterInfo.callbacks[ event ];\n\t\t}\n\t\t// Only `emitter` provided. off() all events for that emitter.\n\t\telse if ( emitterInfo ) {\n\t\t\tfor ( event in emitterInfo.callbacks ) {\n\t\t\t\tthis.stopListening( emitter, event );\n\t\t\t}\n\t\t\tdelete emitters[ emitterId ];\n\t\t}\n\t\t// No params provided. off() all emitters.\n\t\telse {\n\t\t\tfor ( emitterId in emitters ) {\n\t\t\t\tthis.stopListening( emitters[ emitterId ].emitter );\n\t\t\t}\n\t\t\tdelete this[ _listeningTo ];\n\t\t}\n\t},\n\n\t/**\n\t * @inheritDoc\n\t */\n\tfire( eventOrInfo, ...args ) {\n\t\ttry {\n\t\t\tconst eventInfo = eventOrInfo instanceof EventInfo ? eventOrInfo : new EventInfo( this, eventOrInfo );\n\t\t\tconst event = eventInfo.name;\n\t\t\tlet callbacks = getCallbacksForEvent( this, event );\n\n\t\t\t// Record that the event passed this emitter on its path.\n\t\t\teventInfo.path.push( this );\n\n\t\t\t// Handle event listener callbacks first.\n\t\t\tif ( callbacks ) {\n\t\t\t\t// Arguments passed to each callback.\n\t\t\t\tconst callbackArgs = [ eventInfo, ...args ];\n\n\t\t\t\t// Copying callbacks array is the easiest and most secure way of preventing infinite loops, when event callbacks\n\t\t\t\t// are added while processing other callbacks. Previous solution involved adding counters (unique ids) but\n\t\t\t\t// failed if callbacks were added to the queue before currently processed callback.\n\t\t\t\t// If this proves to be too inefficient, another method is to change `.on()` so callbacks are stored if same\n\t\t\t\t// event is currently processed. Then, `.fire()` at the end, would have to add all stored events.\n\t\t\t\tcallbacks = Array.from( callbacks );\n\n\t\t\t\tfor ( let i = 0; i < callbacks.length; i++ ) {\n\t\t\t\t\tcallbacks[ i ].callback.apply( this, callbackArgs );\n\n\t\t\t\t\t// Remove the callback from future requests if off() has been called.\n\t\t\t\t\tif ( eventInfo.off.called ) {\n\t\t\t\t\t\t// Remove the called mark for the next calls.\n\t\t\t\t\t\tdelete eventInfo.off.called;\n\n\t\t\t\t\t\tremoveCallback( this, event, callbacks[ i ].callback );\n\t\t\t\t\t}\n\n\t\t\t\t\t// Do not execute next callbacks if stop() was called.\n\t\t\t\t\tif ( eventInfo.stop.called ) {\n\t\t\t\t\t\tbreak;\n\t\t\t\t\t}\n\t\t\t\t}\n\t\t\t}\n\n\t\t\t// Delegate event to other emitters if needed.\n\t\t\tif ( this._delegations ) {\n\t\t\t\tconst destinations = this._delegations.get( event );\n\t\t\t\tconst passAllDestinations = this._delegations.get( '*' );\n\n\t\t\t\tif ( destinations ) {\n\t\t\t\t\tfireDelegatedEvents( destinations, eventInfo, args );\n\t\t\t\t}\n\n\t\t\t\tif ( passAllDestinations ) {\n\t\t\t\t\tfireDelegatedEvents( passAllDestinations, eventInfo, args );\n\t\t\t\t}\n\t\t\t}\n\n\t\t\treturn eventInfo.return;\n\t\t} catch ( err ) {\n\t\t\t// @if CK_DEBUG // throw err;\n\t\t\t/* istanbul ignore next */\n\t\t\tCKEditorError.rethrowUnexpectedError( err, this );\n\t\t}\n\t},\n\n\t/**\n\t * @inheritDoc\n\t */\n\tdelegate( ...events ) {\n\t\treturn {\n\t\t\tto: ( emitter, nameOrFunction ) => {\n\t\t\t\tif ( !this._delegations ) {\n\t\t\t\t\tthis._delegations = new Map();\n\t\t\t\t}\n\n\t\t\t\t// Originally there was a for..of loop which unfortunately caused an error in Babel that didn't allow\n\t\t\t\t// build an application. See: https://github.com/ckeditor/ckeditor5-react/issues/40.\n\t\t\t\tevents.forEach( eventName => {\n\t\t\t\t\tconst destinations = this._delegations.get( eventName );\n\n\t\t\t\t\tif ( !destinations ) {\n\t\t\t\t\t\tthis._delegations.set( eventName, new Map( [ [ emitter, nameOrFunction ] ] ) );\n\t\t\t\t\t} else {\n\t\t\t\t\t\tdestinations.set( emitter, nameOrFunction );\n\t\t\t\t\t}\n\t\t\t\t} );\n\t\t\t}\n\t\t};\n\t},\n\n\t/**\n\t * @inheritDoc\n\t */\n\tstopDelegating( event, emitter ) {\n\t\tif ( !this._delegations ) {\n\t\t\treturn;\n\t\t}\n\n\t\tif ( !event ) {\n\t\t\tthis._delegations.clear();\n\t\t} else if ( !emitter ) {\n\t\t\tthis._delegations.delete( event );\n\t\t} else {\n\t\t\tconst destinations = this._delegations.get( event );\n\n\t\t\tif ( destinations ) {\n\t\t\t\tdestinations.delete( emitter );\n\t\t\t}\n\t\t}\n\t}\n};\n\nexport default EmitterMixin;\n\n/**\n * Emitter/listener interface.\n *\n * Can be easily implemented by a class by mixing the {@link module:utils/emittermixin~EmitterMixin} mixin.\n *\n * @interface Emitter\n */\n\n/**\n * Registers a callback function to be executed when an event is fired.\n *\n * Shorthand for {@link #listenTo `this.listenTo( this, event, callback, options )`} (it makes the emitter\n * listen on itself).\n *\n * @method #on\n * @param {String} event The name of the event.\n * @param {Function} callback The function to be called on event.\n * @param {Object} [options={}] Additional options.\n * @param {module:utils/priorities~PriorityString|Number} [options.priority='normal'] The priority of this event callback. The higher\n * the priority value the sooner the callback will be fired. Events having the same priority are called in the\n * order they were added.\n */\n\n/**\n * Registers a callback function to be executed on the next time the event is fired only. This is similar to\n * calling {@link #on} followed by {@link #off} in the callback.\n *\n * @method #once\n * @param {String} event The name of the event.\n * @param {Function} callback The function to be called on event.\n * @param {Object} [options={}] Additional options.\n * @param {module:utils/priorities~PriorityString|Number} [options.priority='normal'] The priority of this event callback. The higher\n * the priority value the sooner the callback will be fired. Events having the same priority are called in the\n * order they were added.\n */\n\n/**\n * Stops executing the callback on the given event.\n * Shorthand for {@link #stopListening `this.stopListening( this, event, callback )`}.\n *\n * @method #off\n * @param {String} event The name of the event.\n * @param {Function} callback The function to stop being called.\n */\n\n/**\n * Registers a callback function to be executed when an event is fired in a specific (emitter) object.\n *\n * Events can be grouped in namespaces using `:`.\n * When namespaced event is fired, it additionally fires all callbacks for that namespace.\n *\n *\t\t// myEmitter.on( ... ) is a shorthand for myEmitter.listenTo( myEmitter, ... ).\n *\t\tmyEmitter.on( 'myGroup', genericCallback );\n *\t\tmyEmitter.on( 'myGroup:myEvent', specificCallback );\n *\n *\t\t// genericCallback is fired.\n *\t\tmyEmitter.fire( 'myGroup' );\n *\t\t// both genericCallback and specificCallback are fired.\n *\t\tmyEmitter.fire( 'myGroup:myEvent' );\n *\t\t// genericCallback is fired even though there are no callbacks for \"foo\".\n *\t\tmyEmitter.fire( 'myGroup:foo' );\n *\n * An event callback can {@link module:utils/eventinfo~EventInfo#stop stop the event} and\n * set the {@link module:utils/eventinfo~EventInfo#return return value} of the {@link #fire} method.\n *\n * @method #listenTo\n * @param {module:utils/emittermixin~Emitter} emitter The object that fires the event.\n * @param {String} event The name of the event.\n * @param {Function} callback The function to be called on event.\n * @param {Object} [options={}] Additional options.\n * @param {module:utils/priorities~PriorityString|Number} [options.priority='normal'] The priority of this event callback. The higher\n * the priority value the sooner the callback will be fired. Events having the same priority are called in the\n * order they were added.\n */\n\n/**\n * Stops listening for events. It can be used at different levels:\n *\n * * To stop listening to a specific callback.\n * * To stop listening to a specific event.\n * * To stop listening to all events fired by a specific object.\n * * To stop listening to all events fired by all objects.\n *\n * @method #stopListening\n * @param {module:utils/emittermixin~Emitter} [emitter] The object to stop listening to. If omitted, stops it for all objects.\n * @param {String} [event] (Requires the `emitter`) The name of the event to stop listening to. If omitted, stops it\n * for all events from `emitter`.\n * @param {Function} [callback] (Requires the `event`) The function to be removed from the call list for the given\n * `event`.\n */\n\n/**\n * Fires an event, executing all callbacks registered for it.\n *\n * The first parameter passed to callbacks is an {@link module:utils/eventinfo~EventInfo} object,\n * followed by the optional `args` provided in the `fire()` method call.\n *\n * @method #fire\n * @param {String|module:utils/eventinfo~EventInfo} eventOrInfo The name of the event or `EventInfo` object if event is delegated.\n * @param {...*} [args] Additional arguments to be passed to the callbacks.\n * @returns {*} By default the method returns `undefined`. However, the return value can be changed by listeners\n * through modification of the {@link module:utils/eventinfo~EventInfo#return `evt.return`}'s property (the event info\n * is the first param of every callback).\n */\n\n/**\n * Delegates selected events to another {@link module:utils/emittermixin~Emitter}. For instance:\n *\n *\t\temitterA.delegate( 'eventX' ).to( emitterB );\n *\t\temitterA.delegate( 'eventX', 'eventY' ).to( emitterC );\n *\n * then `eventX` is delegated (fired by) `emitterB` and `emitterC` along with `data`:\n *\n *\t\temitterA.fire( 'eventX', data );\n *\n * and `eventY` is delegated (fired by) `emitterC` along with `data`:\n *\n *\t\temitterA.fire( 'eventY', data );\n *\n * @method #delegate\n * @param {...String} events Event names that will be delegated to another emitter.\n * @returns {module:utils/emittermixin~EmitterMixinDelegateChain}\n */\n\n/**\n * Stops delegating events. It can be used at different levels:\n *\n * * To stop delegating all events.\n * * To stop delegating a specific event to all emitters.\n * * To stop delegating a specific event to a specific emitter.\n *\n * @method #stopDelegating\n * @param {String} [event] The name of the event to stop delegating. If omitted, stops it all delegations.\n * @param {module:utils/emittermixin~Emitter} [emitter] (requires `event`) The object to stop delegating a particular event to.\n * If omitted, stops delegation of `event` to all emitters.\n */\n\n/**\n * Checks if `listeningEmitter` listens to an emitter with given `listenedToEmitterId` and if so, returns that emitter.\n * If not, returns `null`.\n *\n * @protected\n * @param {module:utils/emittermixin~Emitter} listeningEmitter An emitter that listens.\n * @param {String} listenedToEmitterId Unique emitter id of emitter listened to.\n * @returns {module:utils/emittermixin~Emitter|null}\n */\nexport function _getEmitterListenedTo( listeningEmitter, listenedToEmitterId ) {\n\tif ( listeningEmitter[ _listeningTo ] && listeningEmitter[ _listeningTo ][ listenedToEmitterId ] ) {\n\t\treturn listeningEmitter[ _listeningTo ][ listenedToEmitterId ].emitter;\n\t}\n\n\treturn null;\n}\n\n/**\n * Sets emitter's unique id.\n *\n * **Note:** `_emitterId` can be set only once.\n *\n * @protected\n * @param {module:utils/emittermixin~Emitter} emitter An emitter for which id will be set.\n * @param {String} [id] Unique id to set. If not passed, random unique id will be set.\n */\nexport function _setEmitterId( emitter, id ) {\n\tif ( !emitter[ _emitterId ] ) {\n\t\temitter[ _emitterId ] = id || uid();\n\t}\n}\n\n/**\n * Returns emitter's unique id.\n *\n * @protected\n * @param {module:utils/emittermixin~Emitter} emitter An emitter which id will be returned.\n */\nexport function _getEmitterId( emitter ) {\n\treturn emitter[ _emitterId ];\n}\n\n// Gets the internal `_events` property of the given object.\n// `_events` property store all lists with callbacks for registered event names.\n// If there were no events registered on the object, empty `_events` object is created.\nfunction getEvents( source ) {\n\tif ( !source._events ) {\n\t\tObject.defineProperty( source, '_events', {\n\t\t\tvalue: {}\n\t\t} );\n\t}\n\n\treturn source._events;\n}\n\n// Creates event node for generic-specific events relation architecture.\nfunction makeEventNode() {\n\treturn {\n\t\tcallbacks: [],\n\t\tchildEvents: []\n\t};\n}\n\n// Creates an architecture for generic-specific events relation.\n// If needed, creates all events for given eventName, i.e. if the first registered event\n// is foo:bar:abc, it will create foo:bar:abc, foo:bar and foo event and tie them together.\n// It also copies callbacks from more generic events to more specific events when\n// specific events are created.\nfunction createEventNamespace( source, eventName ) {\n\tconst events = getEvents( source );\n\n\t// First, check if the event we want to add to the structure already exists.\n\tif ( events[ eventName ] ) {\n\t\t// If it exists, we don't have to do anything.\n\t\treturn;\n\t}\n\n\t// In other case, we have to create the structure for the event.\n\t// Note, that we might need to create intermediate events too.\n\t// I.e. if foo:bar:abc is being registered and we only have foo in the structure,\n\t// we need to also register foo:bar.\n\n\t// Currently processed event name.\n\tlet name = eventName;\n\t// Name of the event that is a child event for currently processed event.\n\tlet childEventName = null;\n\n\t// Array containing all newly created specific events.\n\tconst newEventNodes = [];\n\n\t// While loop can't check for ':' index because we have to handle generic events too.\n\t// In each loop, we truncate event name, going from the most specific name to the generic one.\n\t// I.e. foo:bar:abc -> foo:bar -> foo.\n\twhile ( name !== '' ) {\n\t\tif ( events[ name ] ) {\n\t\t\t// If the currently processed event name is already registered, we can be sure\n\t\t\t// that it already has all the structure created, so we can break the loop here\n\t\t\t// as no more events need to be registered.\n\t\t\tbreak;\n\t\t}\n\n\t\t// If this event is not yet registered, create a new object for it.\n\t\tevents[ name ] = makeEventNode();\n\t\t// Add it to the array with newly created events.\n\t\tnewEventNodes.push( events[ name ] );\n\n\t\t// Add previously processed event name as a child of this event.\n\t\tif ( childEventName ) {\n\t\t\tevents[ name ].childEvents.push( childEventName );\n\t\t}\n\n\t\tchildEventName = name;\n\t\t// If `.lastIndexOf()` returns -1, `.substr()` will return '' which will break the loop.\n\t\tname = name.substr( 0, name.lastIndexOf( ':' ) );\n\t}\n\n\tif ( name !== '' ) {\n\t\t// If name is not empty, we found an already registered event that was a parent of the\n\t\t// event we wanted to register.\n\n\t\t// Copy that event's callbacks to newly registered events.\n\t\tfor ( const node of newEventNodes ) {\n\t\t\tnode.callbacks = events[ name ].callbacks.slice();\n\t\t}\n\n\t\t// Add last newly created event to the already registered event.\n\t\tevents[ name ].childEvents.push( childEventName );\n\t}\n}\n\n// Gets an array containing callbacks list for a given event and it's more specific events.\n// I.e. if given event is foo:bar and there is also foo:bar:abc event registered, this will\n// return callback list of foo:bar and foo:bar:abc (but not foo).\nfunction getCallbacksListsForNamespace( source, eventName ) {\n\tconst eventNode = getEvents( source )[ eventName ];\n\n\tif ( !eventNode ) {\n\t\treturn [];\n\t}\n\n\tlet callbacksLists = [ eventNode.callbacks ];\n\n\tfor ( let i = 0; i < eventNode.childEvents.length; i++ ) {\n\t\tconst childCallbacksLists = getCallbacksListsForNamespace( source, eventNode.childEvents[ i ] );\n\n\t\tcallbacksLists = callbacksLists.concat( childCallbacksLists );\n\t}\n\n\treturn callbacksLists;\n}\n\n// Get the list of callbacks for a given event, but only if there any callbacks have been registered.\n// If there are no callbacks registered for given event, it checks if this is a specific event and looks\n// for callbacks for it's more generic version.\nfunction getCallbacksForEvent( source, eventName ) {\n\tlet event;\n\n\tif ( !source._events || !( event = source._events[ eventName ] ) || !event.callbacks.length ) {\n\t\t// There are no callbacks registered for specified eventName.\n\t\t// But this could be a specific-type event that is in a namespace.\n\t\tif ( eventName.indexOf( ':' ) > -1 ) {\n\t\t\t// If the eventName is specific, try to find callback lists for more generic event.\n\t\t\treturn getCallbacksForEvent( source, eventName.substr( 0, eventName.lastIndexOf( ':' ) ) );\n\t\t} else {\n\t\t\t// If this is a top-level generic event, return null;\n\t\t\treturn null;\n\t\t}\n\t}\n\n\treturn event.callbacks;\n}\n\n// Fires delegated events for given map of destinations.\n//\n// @private\n// * @param {Map.<utils.Emitter>} destinations A map containing\n// `[ {@link module:utils/emittermixin~Emitter}, \"event name\" ]` pair destinations.\n// * @param {utils.EventInfo} eventInfo The original event info object.\n// * @param {Array.<*>} fireArgs Arguments the original event was fired with.\nfunction fireDelegatedEvents( destinations, eventInfo, fireArgs ) {\n\tfor ( let [ emitter, name ] of destinations ) {\n\t\tif ( !name ) {\n\t\t\tname = eventInfo.name;\n\t\t} else if ( typeof name == 'function' ) {\n\t\t\tname = name( eventInfo.name );\n\t\t}\n\n\t\tconst delegatedInfo = new EventInfo( eventInfo.source, name );\n\n\t\tdelegatedInfo.path = [ ...eventInfo.path ];\n\n\t\temitter.fire( delegatedInfo, ...fireArgs );\n\t}\n}\n\n// Removes callback from emitter for given event.\n//\n// @param {module:utils/emittermixin~Emitter} emitter\n// @param {String} event\n// @param {Function} callback\nfunction removeCallback( emitter, event, callback ) {\n\tconst lists = getCallbacksListsForNamespace( emitter, event );\n\n\tfor ( const callbacks of lists ) {\n\t\tfor ( let i = 0; i < callbacks.length; i++ ) {\n\t\t\tif ( callbacks[ i ].callback == callback ) {\n\t\t\t\t// Remove the callback from the list (fixing the next index).\n\t\t\t\tcallbacks.splice( i, 1 );\n\t\t\t\ti--;\n\t\t\t}\n\t\t}\n\t}\n}\n\n/**\n * The return value of {@link ~EmitterMixin#delegate}.\n *\n * @interface module:utils/emittermixin~EmitterMixinDelegateChain\n */\n\n/**\n * Selects destination for {@link module:utils/emittermixin~EmitterMixin#delegate} events.\n *\n * @method #to\n * @param {module:utils/emittermixin~Emitter} emitter An `EmitterMixin` instance which is the destination for delegated events.\n * @param {String|Function} [nameOrFunction] A custom event name or function which converts the original name string.\n */\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module utils/isiterable\n */\n\n/**\n * Checks if value implements iterator interface.\n *\n * @param {*} value The value to check.\n * @returns {Boolean} True if value implements iterator interface.\n */\nexport default function isIterable( value ) {\n\treturn !!( value && value[ Symbol.iterator ] );\n}\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module utils/mix\n */\n\n/**\n * Copies enumerable properties and symbols from the objects given as 2nd+ parameters to the\n * prototype of first object (a constructor).\n *\n *\t\tclass Editor {\n *\t\t\t...\n *\t\t}\n *\n *\t\tconst SomeMixin = {\n *\t\t\ta() {\n *\t\t\t\treturn 'a';\n *\t\t\t}\n *\t\t};\n *\n *\t\tmix( Editor, SomeMixin, ... );\n *\n *\t\tnew Editor().a(); // -> 'a'\n *\n * Note: Properties which already exist in the base class will not be overriden.\n *\n * @param {Function} [baseClass] Class which prototype will be extended.\n * @param {Object} [...mixins] Objects from which to get properties.\n */\nexport default function mix( baseClass, ...mixins ) {\n\tmixins.forEach( mixin => {\n\t\tObject.getOwnPropertyNames( mixin ).concat( Object.getOwnPropertySymbols( mixin ) )\n\t\t\t.forEach( key => {\n\t\t\t\tif ( key in baseClass.prototype ) {\n\t\t\t\t\treturn;\n\t\t\t\t}\n\n\t\t\t\tconst sourceDescriptor = Object.getOwnPropertyDescriptor( mixin, key );\n\t\t\t\tsourceDescriptor.enumerable = false;\n\n\t\t\t\tObject.defineProperty( baseClass.prototype, key, sourceDescriptor );\n\t\t\t} );\n\t} );\n}\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module utils/collection\n */\n\nimport EmitterMixin from './emittermixin';\nimport CKEditorError from './ckeditorerror';\nimport uid from './uid';\nimport isIterable from './isiterable';\nimport mix from './mix';\n\n/**\n * Collections are ordered sets of objects. Items in the collection can be retrieved by their indexes\n * in the collection (like in an array) or by their ids.\n *\n * If an object without an `id` property is being added to the collection, the `id` property will be generated\n * automatically. Note that the automatically generated id is unique only within this single collection instance.\n *\n * By default an item in the collection is identified by its `id` property. The name of the identifier can be\n * configured through the constructor of the collection.\n *\n * @mixes module:utils/emittermixin~EmitterMixin\n */\nexport default class Collection {\n\t/**\n\t * Creates a new Collection instance.\n\t *\n\t * You can provide an iterable of initial items the collection will be created with:\n\t *\n\t *\t\tconst collection = new Collection( [ { id: 'John' }, { id: 'Mike' } ] );\n\t *\n\t *\t\tconsole.log( collection.get( 0 ) ); // -> { id: 'John' }\n\t *\t\tconsole.log( collection.get( 1 ) ); // -> { id: 'Mike' }\n\t *\t\tconsole.log( collection.get( 'Mike' ) ); // -> { id: 'Mike' }\n\t *\n\t * Or you can first create a collection and then add new items using the {@link #add} method:\n\t *\n\t *\t\tconst collection = new Collection();\n\t *\n\t *\t\tcollection.add( { id: 'John' } );\n\t *\t\tconsole.log( collection.get( 0 ) ); // -> { id: 'John' }\n\t *\n\t * Whatever option you choose, you can always pass a configuration object as the last argument\n\t * of the constructor:\n\t *\n\t *\t\tconst emptyCollection = new Collection( { idProperty: 'name' } );\n\t *\t\temptyCollection.add( { name: 'John' } );\n\t *\t\tconsole.log( collection.get( 'John' ) ); // -> { name: 'John' }\n\t *\n\t *\t\tconst nonEmptyCollection = new Collection( [ { name: 'John' } ], { idProperty: 'name' } );\n\t *\t\tnonEmptyCollection.add( { name: 'George' } );\n\t *\t\tconsole.log( collection.get( 'George' ) ); // -> { name: 'George' }\n\t *\t\tconsole.log( collection.get( 'John' ) ); // -> { name: 'John' }\n\t *\n\t * @param {Iterable.<Object>|Object} initialItemsOrOptions The initial items of the collection or\n\t * the options object.\n\t * @param {Object} [options={}] The options object, when the first argument is an array of initial items.\n\t * @param {String} [options.idProperty='id'] The name of the property which is used to identify an item.\n\t * Items that do not have such a property will be assigned one when added to the collection.\n\t */\n\tconstructor( initialItemsOrOptions = {}, options = {} ) {\n\t\tconst hasInitialItems = isIterable( initialItemsOrOptions );\n\n\t\tif ( !hasInitialItems ) {\n\t\t\toptions = initialItemsOrOptions;\n\t\t}\n\n\t\t/**\n\t\t * The internal list of items in the collection.\n\t\t *\n\t\t * @private\n\t\t * @member {Object[]}\n\t\t */\n\t\tthis._items = [];\n\n\t\t/**\n\t\t * The internal map of items in the collection.\n\t\t *\n\t\t * @private\n\t\t * @member {Map}\n\t\t */\n\t\tthis._itemMap = new Map();\n\n\t\t/**\n\t\t * The name of the property which is considered to identify an item.\n\t\t *\n\t\t * @private\n\t\t * @member {String}\n\t\t */\n\t\tthis._idProperty = options.idProperty || 'id';\n\n\t\t/**\n\t\t * A helper mapping external items of a bound collection ({@link #bindTo})\n\t\t * and actual items of this collection. It provides information\n\t\t * necessary to properly remove items bound to another collection.\n\t\t *\n\t\t * See {@link #_bindToInternalToExternalMap}.\n\t\t *\n\t\t * @protected\n\t\t * @member {WeakMap}\n\t\t */\n\t\tthis._bindToExternalToInternalMap = new WeakMap();\n\n\t\t/**\n\t\t * A helper mapping items of this collection to external items of a bound collection\n\t\t * ({@link #bindTo}). It provides information necessary to manage the bindings, e.g.\n\t\t * to avoid loops in two–way bindings.\n\t\t *\n\t\t * See {@link #_bindToExternalToInternalMap}.\n\t\t *\n\t\t * @protected\n\t\t * @member {WeakMap}\n\t\t */\n\t\tthis._bindToInternalToExternalMap = new WeakMap();\n\n\t\t/**\n\t\t * Stores indexes of skipped items from bound external collection.\n\t\t *\n\t\t * @private\n\t\t * @member {Array}\n\t\t */\n\t\tthis._skippedIndexesFromExternal = [];\n\n\t\t// Set the initial content of the collection (if provided in the constructor).\n\t\tif ( hasInitialItems ) {\n\t\t\tfor ( const item of initialItemsOrOptions ) {\n\t\t\t\tthis._items.push( item );\n\t\t\t\tthis._itemMap.set( this._getItemIdBeforeAdding( item ), item );\n\t\t\t}\n\t\t}\n\n\t\t/**\n\t\t * A collection instance this collection is bound to as a result\n\t\t * of calling {@link #bindTo} method.\n\t\t *\n\t\t * @protected\n\t\t * @member {module:utils/collection~Collection} #_bindToCollection\n\t\t */\n\t}\n\n\t/**\n\t * The number of items available in the collection.\n\t *\n\t * @member {Number} #length\n\t */\n\tget length() {\n\t\treturn this._items.length;\n\t}\n\n\t/**\n\t * Returns the first item from the collection or null when collection is empty.\n\t *\n\t * @returns {Object|null} The first item or `null` if collection is empty.\n\t */\n\tget first() {\n\t\treturn this._items[ 0 ] || null;\n\t}\n\n\t/**\n\t * Returns the last item from the collection or null when collection is empty.\n\t *\n\t * @returns {Object|null} The last item or `null` if collection is empty.\n\t */\n\tget last() {\n\t\treturn this._items[ this.length - 1 ] || null;\n\t}\n\n\t/**\n\t * Adds an item into the collection.\n\t *\n\t * If the item does not have an id, then it will be automatically generated and set on the item.\n\t *\n\t * @chainable\n\t * @param {Object} item\n\t * @param {Number} [index] The position of the item in the collection. The item\n\t * is pushed to the collection when `index` not specified.\n\t * @fires add\n\t * @fires change\n\t */\n\tadd( item, index ) {\n\t\treturn this.addMany( [ item ], index );\n\t}\n\n\t/**\n\t * Adds multiple items into the collection.\n\t *\n\t * Any item not containing an id will get an automatically generated one.\n\t *\n\t * @chainable\n\t * @param {Iterable.<Object>} item\n\t * @param {Number} [index] The position of the insertion. Items will be appended if no `index` is specified.\n\t * @fires add\n\t * @fires change\n\t */\n\taddMany( items, index ) {\n\t\tif ( index === undefined ) {\n\t\t\tindex = this._items.length;\n\t\t} else if ( index > this._items.length || index < 0 ) {\n\t\t\t/**\n\t\t\t * The `index` passed to {@link module:utils/collection~Collection#addMany `Collection#addMany()`}\n\t\t\t * is invalid. It must be a number between 0 and the collection's length.\n\t\t\t *\n\t\t\t * @error collection-add-item-invalid-index\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'collection-add-item-invalid-index', this );\n\t\t}\n\n\t\tfor ( let offset = 0; offset < items.length; offset++ ) {\n\t\t\tconst item = items[ offset ];\n\t\t\tconst itemId = this._getItemIdBeforeAdding( item );\n\t\t\tconst currentItemIndex = index + offset;\n\n\t\t\tthis._items.splice( currentItemIndex, 0, item );\n\t\t\tthis._itemMap.set( itemId, item );\n\n\t\t\tthis.fire( 'add', item, currentItemIndex );\n\t\t}\n\n\t\tthis.fire( 'change', {\n\t\t\tadded: items,\n\t\t\tremoved: [],\n\t\t\tindex\n\t\t} );\n\n\t\treturn this;\n\t}\n\n\t/**\n\t * Gets an item by its ID or index.\n\t *\n\t * @param {String|Number} idOrIndex The item ID or index in the collection.\n\t * @returns {Object|null} The requested item or `null` if such item does not exist.\n\t */\n\tget( idOrIndex ) {\n\t\tlet item;\n\n\t\tif ( typeof idOrIndex == 'string' ) {\n\t\t\titem = this._itemMap.get( idOrIndex );\n\t\t} else if ( typeof idOrIndex == 'number' ) {\n\t\t\titem = this._items[ idOrIndex ];\n\t\t} else {\n\t\t\t/**\n\t\t\t * An index or ID must be given.\n\t\t\t *\n\t\t\t * @error collection-get-invalid-arg\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'collection-get-invalid-arg', this );\n\t\t}\n\n\t\treturn item || null;\n\t}\n\n\t/**\n\t * Returns a Boolean indicating whether the collection contains an item.\n\t *\n\t * @param {Object|String} itemOrId The item or its ID in the collection.\n\t * @returns {Boolean} `true` if the collection contains the item, `false` otherwise.\n\t */\n\thas( itemOrId ) {\n\t\tif ( typeof itemOrId == 'string' ) {\n\t\t\treturn this._itemMap.has( itemOrId );\n\t\t} else { // Object\n\t\t\tconst idProperty = this._idProperty;\n\t\t\tconst id = itemOrId[ idProperty ];\n\n\t\t\treturn this._itemMap.has( id );\n\t\t}\n\t}\n\n\t/**\n\t * Gets an index of an item in the collection.\n\t * When an item is not defined in the collection, the index will equal -1.\n\t *\n\t * @param {Object|String} itemOrId The item or its ID in the collection.\n\t * @returns {Number} The index of a given item.\n\t */\n\tgetIndex( itemOrId ) {\n\t\tlet item;\n\n\t\tif ( typeof itemOrId == 'string' ) {\n\t\t\titem = this._itemMap.get( itemOrId );\n\t\t} else {\n\t\t\titem = itemOrId;\n\t\t}\n\n\t\treturn this._items.indexOf( item );\n\t}\n\n\t/**\n\t * Removes an item from the collection.\n\t *\n\t * @param {Object|Number|String} subject The item to remove, its ID or index in the collection.\n\t * @returns {Object} The removed item.\n\t * @fires remove\n\t * @fires change\n\t */\n\tremove( subject ) {\n\t\tconst [ item, index ] = this._remove( subject );\n\n\t\tthis.fire( 'change', {\n\t\t\tadded: [],\n\t\t\tremoved: [ item ],\n\t\t\tindex\n\t\t} );\n\n\t\treturn item;\n\t}\n\n\t/**\n\t * Executes the callback for each item in the collection and composes an array or values returned by this callback.\n\t *\n\t * @param {Function} callback\n\t * @param {Object} callback.item\n\t * @param {Number} callback.index\n\t * @param {Object} ctx Context in which the `callback` will be called.\n\t * @returns {Array} The result of mapping.\n\t */\n\tmap( callback, ctx ) {\n\t\treturn this._items.map( callback, ctx );\n\t}\n\n\t/**\n\t * Finds the first item in the collection for which the `callback` returns a true value.\n\t *\n\t * @param {Function} callback\n\t * @param {Object} callback.item\n\t * @param {Number} callback.index\n\t * @param {Object} ctx Context in which the `callback` will be called.\n\t * @returns {Object} The item for which `callback` returned a true value.\n\t */\n\tfind( callback, ctx ) {\n\t\treturn this._items.find( callback, ctx );\n\t}\n\n\t/**\n\t * Returns an array with items for which the `callback` returned a true value.\n\t *\n\t * @param {Function} callback\n\t * @param {Object} callback.item\n\t * @param {Number} callback.index\n\t * @param {Object} ctx Context in which the `callback` will be called.\n\t * @returns {Object[]} The array with matching items.\n\t */\n\tfilter( callback, ctx ) {\n\t\treturn this._items.filter( callback, ctx );\n\t}\n\n\t/**\n\t * Removes all items from the collection and destroys the binding created using\n\t * {@link #bindTo}.\n\t *\n\t * @fires remove\n\t * @fires change\n\t */\n\tclear() {\n\t\tif ( this._bindToCollection ) {\n\t\t\tthis.stopListening( this._bindToCollection );\n\t\t\tthis._bindToCollection = null;\n\t\t}\n\n\t\tconst removedItems = Array.from( this._items );\n\n\t\twhile ( this.length ) {\n\t\t\tthis._remove( 0 );\n\t\t}\n\n\t\tthis.fire( 'change', {\n\t\t\tadded: [],\n\t\t\tremoved: removedItems,\n\t\t\tindex: 0\n\t\t} );\n\t}\n\n\t/**\n\t * Binds and synchronizes the collection with another one.\n\t *\n\t * The binding can be a simple factory:\n\t *\n\t *\t\tclass FactoryClass {\n\t *\t\t\tconstructor( data ) {\n\t *\t\t\t\tthis.label = data.label;\n\t *\t\t\t}\n\t *\t\t}\n\t *\n\t *\t\tconst source = new Collection( { idProperty: 'label' } );\n\t *\t\tconst target = new Collection();\n\t *\n\t *\t\ttarget.bindTo( source ).as( FactoryClass );\n\t *\n\t *\t\tsource.add( { label: 'foo' } );\n\t *\t\tsource.add( { label: 'bar' } );\n\t *\n\t *\t\tconsole.log( target.length ); // 2\n\t *\t\tconsole.log( target.get( 1 ).label ); // 'bar'\n\t *\n\t *\t\tsource.remove( 0 );\n\t *\t\tconsole.log( target.length ); // 1\n\t *\t\tconsole.log( target.get( 0 ).label ); // 'bar'\n\t *\n\t * or the factory driven by a custom callback:\n\t *\n\t *\t\tclass FooClass {\n\t *\t\t\tconstructor( data ) {\n\t *\t\t\t\tthis.label = data.label;\n\t *\t\t\t}\n\t *\t\t}\n\t *\n\t *\t\tclass BarClass {\n\t *\t\t\tconstructor( data ) {\n\t *\t\t\t\tthis.label = data.label;\n\t *\t\t\t}\n\t *\t\t}\n\t *\n\t *\t\tconst source = new Collection( { idProperty: 'label' } );\n\t *\t\tconst target = new Collection();\n\t *\n\t *\t\ttarget.bindTo( source ).using( ( item ) => {\n\t *\t\t\tif ( item.label == 'foo' ) {\n\t *\t\t\t\treturn new FooClass( item );\n\t *\t\t\t} else {\n\t *\t\t\t\treturn new BarClass( item );\n\t *\t\t\t}\n\t *\t\t} );\n\t *\n\t *\t\tsource.add( { label: 'foo' } );\n\t *\t\tsource.add( { label: 'bar' } );\n\t *\n\t *\t\tconsole.log( target.length ); // 2\n\t *\t\tconsole.log( target.get( 0 ) instanceof FooClass ); // true\n\t *\t\tconsole.log( target.get( 1 ) instanceof BarClass ); // true\n\t *\n\t * or the factory out of property name:\n\t *\n\t *\t\tconst source = new Collection( { idProperty: 'label' } );\n\t *\t\tconst target = new Collection();\n\t *\n\t *\t\ttarget.bindTo( source ).using( 'label' );\n\t *\n\t *\t\tsource.add( { label: { value: 'foo' } } );\n\t *\t\tsource.add( { label: { value: 'bar' } } );\n\t *\n\t *\t\tconsole.log( target.length ); // 2\n\t *\t\tconsole.log( target.get( 0 ).value ); // 'foo'\n\t *\t\tconsole.log( target.get( 1 ).value ); // 'bar'\n\t *\n\t * It's possible to skip specified items by returning falsy value:\n\t *\n\t *\t\tconst source = new Collection();\n\t *\t\tconst target = new Collection();\n\t *\n\t *\t\ttarget.bindTo( source ).using( item => {\n\t *\t\t\tif ( item.hidden ) {\n\t *\t\t\t\treturn null;\n\t *\t\t\t}\n\t *\n\t *\t\t\treturn item;\n\t *\t\t} );\n\t *\n\t *\t\tsource.add( { hidden: true } );\n\t *\t\tsource.add( { hidden: false } );\n\t *\n\t *\t\tconsole.log( source.length ); // 2\n\t *\t\tconsole.log( target.length ); // 1\n\t *\n\t * **Note**: {@link #clear} can be used to break the binding.\n\t *\n\t * @param {module:utils/collection~Collection} externalCollection A collection to be bound.\n\t * @returns {Object}\n\t * @returns {module:utils/collection~CollectionBindToChain} The binding chain object.\n\t */\n\tbindTo( externalCollection ) {\n\t\tif ( this._bindToCollection ) {\n\t\t\t/**\n\t\t\t * The collection cannot be bound more than once.\n\t\t\t *\n\t\t\t * @error collection-bind-to-rebind\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'collection-bind-to-rebind', this );\n\t\t}\n\n\t\tthis._bindToCollection = externalCollection;\n\n\t\treturn {\n\t\t\tas: Class => {\n\t\t\t\tthis._setUpBindToBinding( item => new Class( item ) );\n\t\t\t},\n\n\t\t\tusing: callbackOrProperty => {\n\t\t\t\tif ( typeof callbackOrProperty == 'function' ) {\n\t\t\t\t\tthis._setUpBindToBinding( item => callbackOrProperty( item ) );\n\t\t\t\t} else {\n\t\t\t\t\tthis._setUpBindToBinding( item => item[ callbackOrProperty ] );\n\t\t\t\t}\n\t\t\t}\n\t\t};\n\t}\n\n\t/**\n\t * Finalizes and activates a binding initiated by {#bindTo}.\n\t *\n\t * @protected\n\t * @param {Function} factory A function which produces collection items.\n\t */\n\t_setUpBindToBinding( factory ) {\n\t\tconst externalCollection = this._bindToCollection;\n\n\t\t// Adds the item to the collection once a change has been done to the external collection.\n\t\t//\n\t\t// @private\n\t\tconst addItem = ( evt, externalItem, index ) => {\n\t\t\tconst isExternalBoundToThis = externalCollection._bindToCollection == this;\n\t\t\tconst externalItemBound = externalCollection._bindToInternalToExternalMap.get( externalItem );\n\n\t\t\t// If an external collection is bound to this collection, which makes it a 2–way binding,\n\t\t\t// and the particular external collection item is already bound, don't add it here.\n\t\t\t// The external item has been created **out of this collection's item** and (re)adding it will\n\t\t\t// cause a loop.\n\t\t\tif ( isExternalBoundToThis && externalItemBound ) {\n\t\t\t\tthis._bindToExternalToInternalMap.set( externalItem, externalItemBound );\n\t\t\t\tthis._bindToInternalToExternalMap.set( externalItemBound, externalItem );\n\t\t\t} else {\n\t\t\t\tconst item = factory( externalItem );\n\n\t\t\t\t// When there is no item we need to remember skipped index first and then we can skip this item.\n\t\t\t\tif ( !item ) {\n\t\t\t\t\tthis._skippedIndexesFromExternal.push( index );\n\n\t\t\t\t\treturn;\n\t\t\t\t}\n\n\t\t\t\t// Lets try to put item at the same index as index in external collection\n\t\t\t\t// but when there are a skipped items in one or both collections we need to recalculate this index.\n\t\t\t\tlet finalIndex = index;\n\n\t\t\t\t// When we try to insert item after some skipped items from external collection we need\n\t\t\t\t// to include this skipped items and decrease index.\n\t\t\t\t//\n\t\t\t\t// For the following example:\n\t\t\t\t// external -> [ 'A', 'B - skipped for internal', 'C - skipped for internal' ]\n\t\t\t\t// internal -> [ A ]\n\t\t\t\t//\n\t\t\t\t// Another item is been added at the end of external collection:\n\t\t\t\t// external.add( 'D' )\n\t\t\t\t// external -> [ 'A', 'B - skipped for internal', 'C - skipped for internal', 'D' ]\n\t\t\t\t//\n\t\t\t\t// We can't just add 'D' to internal at the same index as index in external because\n\t\t\t\t// this will produce empty indexes what is invalid:\n\t\t\t\t// internal -> [ 'A', empty, empty, 'D' ]\n\t\t\t\t//\n\t\t\t\t// So we need to include skipped items and decrease index\n\t\t\t\t// internal -> [ 'A', 'D' ]\n\t\t\t\tfor ( const skipped of this._skippedIndexesFromExternal ) {\n\t\t\t\t\tif ( index > skipped ) {\n\t\t\t\t\t\tfinalIndex--;\n\t\t\t\t\t}\n\t\t\t\t}\n\n\t\t\t\t// We need to take into consideration that external collection could skip some items from\n\t\t\t\t// internal collection.\n\t\t\t\t//\n\t\t\t\t// For the following example:\n\t\t\t\t// internal -> [ 'A', 'B - skipped for external', 'C - skipped for external' ]\n\t\t\t\t// external -> [ A ]\n\t\t\t\t//\n\t\t\t\t// Another item is been added at the end of external collection:\n\t\t\t\t// external.add( 'D' )\n\t\t\t\t// external -> [ 'A', 'D' ]\n\t\t\t\t//\n\t\t\t\t// We need to include skipped items and place new item after them:\n\t\t\t\t// internal -> [ 'A', 'B - skipped for external', 'C - skipped for external', 'D' ]\n\t\t\t\tfor ( const skipped of externalCollection._skippedIndexesFromExternal ) {\n\t\t\t\t\tif ( finalIndex >= skipped ) {\n\t\t\t\t\t\tfinalIndex++;\n\t\t\t\t\t}\n\t\t\t\t}\n\n\t\t\t\tthis._bindToExternalToInternalMap.set( externalItem, item );\n\t\t\t\tthis._bindToInternalToExternalMap.set( item, externalItem );\n\t\t\t\tthis.add( item, finalIndex );\n\n\t\t\t\t// After adding new element to internal collection we need update indexes\n\t\t\t\t// of skipped items in external collection.\n\t\t\t\tfor ( let i = 0; i < externalCollection._skippedIndexesFromExternal.length; i++ ) {\n\t\t\t\t\tif ( finalIndex <= externalCollection._skippedIndexesFromExternal[ i ] ) {\n\t\t\t\t\t\texternalCollection._skippedIndexesFromExternal[ i ]++;\n\t\t\t\t\t}\n\t\t\t\t}\n\t\t\t}\n\t\t};\n\n\t\t// Load the initial content of the collection.\n\t\tfor ( const externalItem of externalCollection ) {\n\t\t\taddItem( null, externalItem, externalCollection.getIndex( externalItem ) );\n\t\t}\n\n\t\t// Synchronize the with collection as new items are added.\n\t\tthis.listenTo( externalCollection, 'add', addItem );\n\n\t\t// Synchronize the with collection as new items are removed.\n\t\tthis.listenTo( externalCollection, 'remove', ( evt, externalItem, index ) => {\n\t\t\tconst item = this._bindToExternalToInternalMap.get( externalItem );\n\n\t\t\tif ( item ) {\n\t\t\t\tthis.remove( item );\n\t\t\t}\n\n\t\t\t// After removing element from external collection we need update/remove indexes\n\t\t\t// of skipped items in internal collection.\n\t\t\tthis._skippedIndexesFromExternal = this._skippedIndexesFromExternal.reduce( ( result, skipped ) => {\n\t\t\t\tif ( index < skipped ) {\n\t\t\t\t\tresult.push( skipped - 1 );\n\t\t\t\t}\n\n\t\t\t\tif ( index > skipped ) {\n\t\t\t\t\tresult.push( skipped );\n\t\t\t\t}\n\n\t\t\t\treturn result;\n\t\t\t}, [] );\n\t\t} );\n\t}\n\n\t/**\n\t * Returns an unique id property for a given `item`.\n\t *\n\t * The method will generate new id and assign it to the `item` if it doesn't have any.\n\t *\n\t * @private\n\t * @param {Object} item Item to be added.\n\t * @returns {String}\n\t */\n\t_getItemIdBeforeAdding( item ) {\n\t\tconst idProperty = this._idProperty;\n\t\tlet itemId;\n\n\t\tif ( ( idProperty in item ) ) {\n\t\t\titemId = item[ idProperty ];\n\n\t\t\tif ( typeof itemId != 'string' ) {\n\t\t\t\t/**\n\t\t\t\t * This item's ID should be a string.\n\t\t\t\t *\n\t\t\t\t * @error collection-add-invalid-id\n\t\t\t\t */\n\t\t\t\tthrow new CKEditorError( 'collection-add-invalid-id', this );\n\t\t\t}\n\n\t\t\tif ( this.get( itemId ) ) {\n\t\t\t\t/**\n\t\t\t\t * This item already exists in the collection.\n\t\t\t\t *\n\t\t\t\t * @error collection-add-item-already-exists\n\t\t\t\t */\n\t\t\t\tthrow new CKEditorError( 'collection-add-item-already-exists', this );\n\t\t\t}\n\t\t} else {\n\t\t\titem[ idProperty ] = itemId = uid();\n\t\t}\n\n\t\treturn itemId;\n\t}\n\n\t/**\n\t * Core {@link #remove} method implementation shared in other functions.\n\t *\n\t * In contrast this method **does not** fire the {@link #event:change} event.\n\t *\n\t * @private\n\t * @param {Object} subject The item to remove, its id or index in the collection.\n\t * @returns {Array} Returns an array with the removed item and its index.\n\t * @fires remove\n\t */\n\t_remove( subject ) {\n\t\tlet index, id, item;\n\t\tlet itemDoesNotExist = false;\n\t\tconst idProperty = this._idProperty;\n\n\t\tif ( typeof subject == 'string' ) {\n\t\t\tid = subject;\n\t\t\titem = this._itemMap.get( id );\n\t\t\titemDoesNotExist = !item;\n\n\t\t\tif ( item ) {\n\t\t\t\tindex = this._items.indexOf( item );\n\t\t\t}\n\t\t} else if ( typeof subject == 'number' ) {\n\t\t\tindex = subject;\n\t\t\titem = this._items[ index ];\n\t\t\titemDoesNotExist = !item;\n\n\t\t\tif ( item ) {\n\t\t\t\tid = item[ idProperty ];\n\t\t\t}\n\t\t} else {\n\t\t\titem = subject;\n\t\t\tid = item[ idProperty ];\n\t\t\tindex = this._items.indexOf( item );\n\t\t\titemDoesNotExist = ( index == -1 || !this._itemMap.get( id ) );\n\t\t}\n\n\t\tif ( itemDoesNotExist ) {\n\t\t\t/**\n\t\t\t * Item not found.\n\t\t\t *\n\t\t\t * @error collection-remove-404\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'collection-remove-404', this );\n\t\t}\n\n\t\tthis._items.splice( index, 1 );\n\t\tthis._itemMap.delete( id );\n\n\t\tconst externalItem = this._bindToInternalToExternalMap.get( item );\n\t\tthis._bindToInternalToExternalMap.delete( item );\n\t\tthis._bindToExternalToInternalMap.delete( externalItem );\n\n\t\tthis.fire( 'remove', item, index );\n\n\t\treturn [ item, index ];\n\t}\n\n\t/**\n\t * Iterable interface.\n\t *\n\t * @returns {Iterable.<*>}\n\t */\n\t[ Symbol.iterator ]() {\n\t\treturn this._items[ Symbol.iterator ]();\n\t}\n\n\t/**\n\t * Fired when an item is added to the collection.\n\t *\n\t * @event add\n\t * @param {Object} item The added item.\n\t */\n\n\t/**\n\t * Fired when the collection was changed due to adding or removing items.\n\t *\n\t * @event change\n\t * @param {Iterable.<Object>} added A list of added items.\n\t * @param {Iterable.<Object>} removed A list of removed items.\n\t * @param {Number} index An index where the addition or removal occurred.\n\t */\n\n\t/**\n\t * Fired when an item is removed from the collection.\n\t *\n\t * @event remove\n\t * @param {Object} item The removed item.\n\t * @param {Number} index Index from which item was removed.\n\t */\n}\n\nmix( Collection, EmitterMixin );\n\n/**\n * An object returned by the {@link module:utils/collection~Collection#bindTo `bindTo()`} method\n * providing functions that specify the type of the binding.\n *\n * See the {@link module:utils/collection~Collection#bindTo `bindTo()`} documentation for examples.\n *\n * @interface module:utils/collection~CollectionBindToChain\n */\n\n/**\n * Creates a callback or a property binding.\n *\n * @method #using\n * @param {Function|String} callbackOrProperty  When the function is passed, it should return\n * the collection items. When the string is provided, the property value is used to create the bound collection items.\n */\n\n/**\n * Creates the class factory binding in which items of the source collection are passed to\n * the constructor of the specified class.\n *\n * @method #as\n * @param {Function} Class The class constructor used to create instances in the factory.\n */\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module core/plugincollection\n */\n\nimport CKEditorError, { logError } from '@ckeditor/ckeditor5-utils/src/ckeditorerror';\n\nimport EmitterMixin from '@ckeditor/ckeditor5-utils/src/emittermixin';\nimport mix from '@ckeditor/ckeditor5-utils/src/mix';\n\n/**\n * Manages a list of CKEditor plugins, including loading, resolving dependencies and initialization.\n *\n * @mixes module:utils/emittermixin~EmitterMixin\n */\nexport default class PluginCollection {\n\t/**\n\t * Creates an instance of the plugin collection class.\n\t * Allows loading and initializing plugins and their dependencies.\n\t * Allows providing a list of already loaded plugins. These plugins will not be destroyed along with this collection.\n\t *\n\t * @param {module:core/editor/editor~Editor|module:core/context~Context} context\n\t * @param {Array.<Function>} [availablePlugins] Plugins (constructors) which the collection will be able to use\n\t * when {@link module:core/plugincollection~PluginCollection#init} is used with the plugin names (strings, instead of constructors).\n\t * Usually, the editor will pass its built-in plugins to the collection so they can later be\n\t * used in `config.plugins` or `config.removePlugins` by names.\n\t * @param {Iterable.<Array>} contextPlugins A list of already initialized plugins represented by a\n\t * `[ PluginConstructor, pluginInstance ]` pair.\n\t */\n\tconstructor( context, availablePlugins = [], contextPlugins = [] ) {\n\t\t/**\n\t\t * @protected\n\t\t * @type {module:core/editor/editor~Editor|module:core/context~Context}\n\t\t */\n\t\tthis._context = context;\n\n\t\t/**\n\t\t * @protected\n\t\t * @type {Map}\n\t\t */\n\t\tthis._plugins = new Map();\n\n\t\t/**\n\t\t * A map of plugin constructors that can be retrieved by their names.\n\t\t *\n\t\t * @protected\n\t\t * @type {Map.<String|Function,Function>}\n\t\t */\n\t\tthis._availablePlugins = new Map();\n\n\t\tfor ( const PluginConstructor of availablePlugins ) {\n\t\t\tif ( PluginConstructor.pluginName ) {\n\t\t\t\tthis._availablePlugins.set( PluginConstructor.pluginName, PluginConstructor );\n\t\t\t}\n\t\t}\n\n\t\t/**\n\t\t * Map of {@link module:core/contextplugin~ContextPlugin context plugins} which can be retrieved by their constructors or instances.\n\t\t *\n\t\t * @protected\n\t\t * @type {Map<Function,Function>}\n\t\t */\n\t\tthis._contextPlugins = new Map();\n\n\t\tfor ( const [ PluginConstructor, pluginInstance ] of contextPlugins ) {\n\t\t\tthis._contextPlugins.set( PluginConstructor, pluginInstance );\n\t\t\tthis._contextPlugins.set( pluginInstance, PluginConstructor );\n\n\t\t\t// To make it possible to require a plugin by its name.\n\t\t\tif ( PluginConstructor.pluginName ) {\n\t\t\t\tthis._availablePlugins.set( PluginConstructor.pluginName, PluginConstructor );\n\t\t\t}\n\t\t}\n\t}\n\n\t/**\n\t * Iterable interface.\n\t *\n\t * Returns `[ PluginConstructor, pluginInstance ]` pairs.\n\t *\n\t * @returns {Iterable.<Array>}\n\t */\n\t* [ Symbol.iterator ]() {\n\t\tfor ( const entry of this._plugins ) {\n\t\t\tif ( typeof entry[ 0 ] == 'function' ) {\n\t\t\t\tyield entry;\n\t\t\t}\n\t\t}\n\t}\n\n\t/**\n\t * Gets the plugin instance by its constructor or name.\n\t *\n\t *\t\t// Check if 'Clipboard' plugin was loaded.\n\t *\t\tif ( editor.plugins.has( 'Clipboard' ) ) {\n\t *\t\t\t// Get clipboard plugin instance\n\t *\t\t\tconst clipboard = editor.plugins.get( 'Clipboard' );\n\t *\n\t *\t\t\tthis.listenTo( clipboard, 'inputTransformation', ( evt, data ) => {\n\t *\t\t\t\t// Do something on clipboard input.\n\t *\t\t\t} );\n\t *\t\t}\n\t *\n\t * **Note**: This method will throw an error if a plugin is not loaded. Use `{@link #has editor.plugins.has()}`\n\t * to check if a plugin is available.\n\t *\n\t * @param {Function|String} key The plugin constructor or {@link module:core/plugin~PluginInterface.pluginName name}.\n\t * @returns {module:core/plugin~PluginInterface}\n\t */\n\tget( key ) {\n\t\tconst plugin = this._plugins.get( key );\n\n\t\tif ( !plugin ) {\n\t\t\tlet pluginName = key;\n\n\t\t\tif ( typeof key == 'function' ) {\n\t\t\t\tpluginName = key.pluginName || key.name;\n\t\t\t}\n\n\t\t\t/**\n\t\t\t * The plugin is not loaded and could not be obtained.\n\t\t\t *\n\t\t\t * Plugin classes (constructors) need to be provided to the editor and must be loaded before they can be obtained from\n\t\t\t * the plugin collection.\n\t\t\t * This is usually done in CKEditor 5 builds by setting the {@link module:core/editor/editor~Editor.builtinPlugins}\n\t\t\t * property.\n\t\t\t *\n\t\t\t * **Note**: You can use `{@link module:core/plugincollection~PluginCollection#has editor.plugins.has()}`\n\t\t\t * to check if a plugin was loaded.\n\t\t\t *\n\t\t\t * @error plugincollection-plugin-not-loaded\n\t\t\t * @param {String} plugin The name of the plugin which is not loaded.\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'plugincollection-plugin-not-loaded', this._context, { plugin: pluginName } );\n\t\t}\n\n\t\treturn plugin;\n\t}\n\n\t/**\n\t * Checks if a plugin is loaded.\n\t *\n\t *\t\t// Check if the 'Clipboard' plugin was loaded.\n\t *\t\tif ( editor.plugins.has( 'Clipboard' ) ) {\n\t *\t\t\t// Now use the clipboard plugin instance:\n\t *\t\t\tconst clipboard = editor.plugins.get( 'Clipboard' );\n\t *\n\t *\t\t\t// ...\n\t *\t\t}\n\t *\n\t * @param {Function|String} key The plugin constructor or {@link module:core/plugin~PluginInterface.pluginName name}.\n\t * @returns {Boolean}\n\t */\n\thas( key ) {\n\t\treturn this._plugins.has( key );\n\t}\n\n\t/**\n\t * Initializes a set of plugins and adds them to the collection.\n\t *\n\t * @param {Array.<Function|String>} plugins An array of {@link module:core/plugin~PluginInterface plugin constructors}\n\t * or {@link module:core/plugin~PluginInterface.pluginName plugin names}. The second option (names) works only if\n\t * `availablePlugins` were passed to the {@link #constructor}.\n\t * @param {Array.<String|Function>} [removePlugins] Names of the plugins or plugin constructors\n\t * that should not be loaded (despite being specified in the `plugins` array).\n\t * @returns {Promise.<module:core/plugin~LoadedPlugins>} A promise which gets resolved once all plugins are loaded\n\t * and available in the collection.\n\t */\n\tinit( plugins, removePlugins = [] ) {\n\t\tconst that = this;\n\t\tconst context = this._context;\n\t\tconst loading = new Set();\n\t\tconst loaded = [];\n\n\t\tconst pluginConstructors = mapToAvailableConstructors( plugins );\n\t\tconst removePluginConstructors = mapToAvailableConstructors( removePlugins );\n\t\tconst missingPlugins = getMissingPluginNames( plugins );\n\n\t\tif ( missingPlugins ) {\n\t\t\t/**\n\t\t\t * Some plugins are not available and could not be loaded.\n\t\t\t *\n\t\t\t * Plugin classes (constructors) need to be provided to the editor before they can be loaded by name.\n\t\t\t * This is usually done in CKEditor 5 builds by setting the {@link module:core/editor/editor~Editor.builtinPlugins}\n\t\t\t * property.\n\t\t\t *\n\t\t\t * **If you see this warning when using one of the {@glink builds/index CKEditor 5 Builds}**, it means\n\t\t\t * that you try to enable a plugin which was not included in that build. This may be due to a typo\n\t\t\t * in the plugin name or simply because that plugin is not a part of this build. In the latter scenario,\n\t\t\t * read more about {@glink builds/guides/development/custom-builds custom builds}.\n\t\t\t *\n\t\t\t * **If you see this warning when using one of the editor creators directly** (not a build), then it means\n\t\t\t * that you tried loading plugins by name. However, unlike CKEditor 4, CKEditor 5 does not implement a \"plugin loader\".\n\t\t\t * This means that CKEditor 5 does not know where to load the plugin modules from. Therefore, you need to\n\t\t\t * provide each plugin through a reference (as a constructor function). Check out the examples in\n\t\t\t * {@glink builds/guides/integration/advanced-setup#scenario-2-building-from-source \"Building from source\"}.\n\t\t\t *\n\t\t\t * @error plugincollection-plugin-not-found\n\t\t\t * @param {Array.<String>} plugins The name of the plugins which could not be loaded.\n\t\t\t */\n\t\t\tconst errorId = 'plugincollection-plugin-not-found';\n\n\t\t\t// Log the error, so it's more visible on the console. Hopefully, for a better DX.\n\t\t\tlogError( errorId, { plugins: missingPlugins } );\n\n\t\t\treturn Promise.reject( new CKEditorError( errorId, context, { plugins: missingPlugins } ) );\n\t\t}\n\n\t\treturn Promise.all( pluginConstructors.map( loadPlugin ) )\n\t\t\t.then( () => initPlugins( loaded, 'init' ) )\n\t\t\t.then( () => initPlugins( loaded, 'afterInit' ) )\n\t\t\t.then( () => loaded );\n\n\t\tfunction loadPlugin( PluginConstructor ) {\n\t\t\tif ( removePluginConstructors.includes( PluginConstructor ) ) {\n\t\t\t\treturn;\n\t\t\t}\n\n\t\t\t// The plugin is already loaded or being loaded - do nothing.\n\t\t\tif ( that._plugins.has( PluginConstructor ) || loading.has( PluginConstructor ) ) {\n\t\t\t\treturn;\n\t\t\t}\n\n\t\t\treturn instantiatePlugin( PluginConstructor )\n\t\t\t\t.catch( err => {\n\t\t\t\t\t/**\n\t\t\t\t\t * It was not possible to load the plugin.\n\t\t\t\t\t *\n\t\t\t\t\t * This is a generic error logged to the console when a JavaScript error is thrown during the initialization\n\t\t\t\t\t * of one of the plugins.\n\t\t\t\t\t *\n\t\t\t\t\t * If you correctly handled the promise returned by the editor's `create()` method (as shown below),\n\t\t\t\t\t * you will find the original error logged to the console, too:\n\t\t\t\t\t *\n\t\t\t\t\t *\t\tClassicEditor.create( document.getElementById( 'editor' ) )\n\t\t\t\t\t *\t\t\t.then( editor => {\n\t\t\t\t\t *\t\t\t\t// ...\n\t\t\t\t\t * \t\t\t} )\n\t\t\t\t\t *\t\t\t.catch( error => {\n\t\t\t\t\t *\t\t\t\tconsole.error( error );\n\t\t\t\t\t *\t\t\t} );\n\t\t\t\t\t *\n\t\t\t\t\t * @error plugincollection-load\n\t\t\t\t\t * @param {String} plugin The name of the plugin that could not be loaded.\n\t\t\t\t\t */\n\t\t\t\t\tlogError( 'plugincollection-load', { plugin: PluginConstructor } );\n\n\t\t\t\t\tthrow err;\n\t\t\t\t} );\n\t\t}\n\n\t\tfunction initPlugins( loadedPlugins, method ) {\n\t\t\treturn loadedPlugins.reduce( ( promise, plugin ) => {\n\t\t\t\tif ( !plugin[ method ] ) {\n\t\t\t\t\treturn promise;\n\t\t\t\t}\n\n\t\t\t\tif ( that._contextPlugins.has( plugin ) ) {\n\t\t\t\t\treturn promise;\n\t\t\t\t}\n\n\t\t\t\treturn promise.then( plugin[ method ].bind( plugin ) );\n\t\t\t}, Promise.resolve() );\n\t\t}\n\n\t\tfunction instantiatePlugin( PluginConstructor ) {\n\t\t\treturn new Promise( resolve => {\n\t\t\t\tloading.add( PluginConstructor );\n\n\t\t\t\tif ( PluginConstructor.requires ) {\n\t\t\t\t\tPluginConstructor.requires.forEach( RequiredPluginConstructorOrName => {\n\t\t\t\t\t\tconst RequiredPluginConstructor = getPluginConstructor( RequiredPluginConstructorOrName );\n\n\t\t\t\t\t\tif ( PluginConstructor.isContextPlugin && !RequiredPluginConstructor.isContextPlugin ) {\n\t\t\t\t\t\t\t/**\n\t\t\t\t\t\t\t * If a plugin is a context plugin, all plugins it requires should also be context plugins\n\t\t\t\t\t\t\t * instead of plugins. In other words, if one plugin can be used in the context,\n\t\t\t\t\t\t\t * all its requirements should also be ready to be used in the context. Note that the context\n\t\t\t\t\t\t\t * provides only a part of the API provided by the editor. If one plugin needs a full\n\t\t\t\t\t\t\t * editor API, all plugins which require it are considered as plugins that need a full\n\t\t\t\t\t\t\t * editor API.\n\t\t\t\t\t\t\t *\n\t\t\t\t\t\t\t * @error plugincollection-context-required\n\t\t\t\t\t\t\t * @param {String} plugin The name of the required plugin.\n\t\t\t\t\t\t\t * @param {String} requiredBy The name of the parent plugin.\n\t\t\t\t\t\t\t */\n\t\t\t\t\t\t\tthrow new CKEditorError(\n\t\t\t\t\t\t\t\t'plugincollection-context-required',\n\t\t\t\t\t\t\t\tnull,\n\t\t\t\t\t\t\t\t{ plugin: RequiredPluginConstructor.name, requiredBy: PluginConstructor.name }\n\t\t\t\t\t\t\t);\n\t\t\t\t\t\t}\n\n\t\t\t\t\t\tif ( removePlugins.includes( RequiredPluginConstructor ) ) {\n\t\t\t\t\t\t\t/**\n\t\t\t\t\t\t\t * Cannot load a plugin because one of its dependencies is listed in the `removePlugins` option.\n\t\t\t\t\t\t\t *\n\t\t\t\t\t\t\t * @error plugincollection-required\n\t\t\t\t\t\t\t * @param {String} plugin The name of the required plugin.\n\t\t\t\t\t\t\t * @param {String} requiredBy The name of the parent plugin.\n\t\t\t\t\t\t\t */\n\t\t\t\t\t\t\tthrow new CKEditorError(\n\t\t\t\t\t\t\t\t'plugincollection-required',\n\t\t\t\t\t\t\t\tcontext,\n\t\t\t\t\t\t\t\t{ plugin: RequiredPluginConstructor.name, requiredBy: PluginConstructor.name }\n\t\t\t\t\t\t\t);\n\t\t\t\t\t\t}\n\n\t\t\t\t\t\tloadPlugin( RequiredPluginConstructor );\n\t\t\t\t\t} );\n\t\t\t\t}\n\n\t\t\t\tconst plugin = that._contextPlugins.get( PluginConstructor ) || new PluginConstructor( context );\n\t\t\t\tthat._add( PluginConstructor, plugin );\n\t\t\t\tloaded.push( plugin );\n\n\t\t\t\tresolve();\n\t\t\t} );\n\t\t}\n\n\t\tfunction getPluginConstructor( PluginConstructorOrName ) {\n\t\t\tif ( typeof PluginConstructorOrName == 'function' ) {\n\t\t\t\treturn PluginConstructorOrName;\n\t\t\t}\n\n\t\t\treturn that._availablePlugins.get( PluginConstructorOrName );\n\t\t}\n\n\t\tfunction getMissingPluginNames( plugins ) {\n\t\t\tconst missingPlugins = [];\n\n\t\t\tfor ( const pluginNameOrConstructor of plugins ) {\n\t\t\t\tif ( !getPluginConstructor( pluginNameOrConstructor ) ) {\n\t\t\t\t\tmissingPlugins.push( pluginNameOrConstructor );\n\t\t\t\t}\n\t\t\t}\n\n\t\t\treturn missingPlugins.length ? missingPlugins : null;\n\t\t}\n\n\t\tfunction mapToAvailableConstructors( plugins ) {\n\t\t\treturn plugins\n\t\t\t\t.map( pluginNameOrConstructor => getPluginConstructor( pluginNameOrConstructor ) )\n\t\t\t\t.filter( PluginConstructor => !!PluginConstructor );\n\t\t}\n\t}\n\n\t/**\n\t * Destroys all loaded plugins.\n\t *\n\t * @returns {Promise}\n\t */\n\tdestroy() {\n\t\tconst promises = [];\n\n\t\tfor ( const [ , pluginInstance ] of this ) {\n\t\t\tif ( typeof pluginInstance.destroy == 'function' && !this._contextPlugins.has( pluginInstance ) ) {\n\t\t\t\tpromises.push( pluginInstance.destroy() );\n\t\t\t}\n\t\t}\n\n\t\treturn Promise.all( promises );\n\t}\n\n\t/**\n\t * Adds the plugin to the collection. Exposed mainly for testing purposes.\n\t *\n\t * @protected\n\t * @param {Function} PluginConstructor The plugin constructor.\n\t * @param {module:core/plugin~PluginInterface} plugin The instance of the plugin.\n\t */\n\t_add( PluginConstructor, plugin ) {\n\t\tthis._plugins.set( PluginConstructor, plugin );\n\n\t\tconst pluginName = PluginConstructor.pluginName;\n\n\t\tif ( !pluginName ) {\n\t\t\treturn;\n\t\t}\n\n\t\tif ( this._plugins.has( pluginName ) ) {\n\t\t\t/**\n\t\t\t * Two plugins with the same {@link module:core/plugin~PluginInterface.pluginName} were loaded.\n\t\t\t * This will lead to runtime conflicts between these plugins.\n\t\t\t *\n\t\t\t * In practice, this warning usually means that new plugins were added to an existing CKEditor 5 build.\n\t\t\t * Plugins should always be added to a source version of the editor (`@ckeditor/ckeditor5-editor-*`),\n\t\t\t * not to an editor imported from one of the `@ckeditor/ckeditor5-build-*` packages.\n\t\t\t *\n\t\t\t * Check your import paths and the list of plugins passed to\n\t\t\t * {@link module:core/editor/editor~Editor.create `Editor.create()`}\n\t\t\t * or specified in {@link module:core/editor/editor~Editor.builtinPlugins `Editor.builtinPlugins`}.\n\t\t\t *\n\t\t\t * The second option is that your `node_modules/` directory contains duplicated versions of the same\n\t\t\t * CKEditor 5 packages. Normally, on clean installations, npm deduplicates packages in `node_modules/`, so\n\t\t\t * it may be enough to call `rm -rf node_modules && npm i`. However, if you installed conflicting versions\n\t\t\t * of some packages, their dependencies may need to be installed in more than one version which may lead to this\n\t\t\t * warning.\n\t\t\t *\n\t\t\t * Technically speaking, this error occurs because after adding a plugin to an existing editor build\n\t\t\t * the dependencies of this plugin are being duplicated.\n\t\t\t * They are already built into that editor build and now get added for the second time as dependencies\n\t\t\t * of the plugin you are installing.\n\t\t\t *\n\t\t\t * Read more about {@glink builds/guides/integration/installing-plugins installing plugins}.\n\t\t\t *\n\t\t\t * @error plugincollection-plugin-name-conflict\n\t\t\t * @param {String} pluginName The duplicated plugin name.\n\t\t\t * @param {Function} plugin1 The first plugin constructor.\n\t\t\t * @param {Function} plugin2 The second plugin constructor.\n\t\t\t */\n\t\t\tthrow new CKEditorError(\n\t\t\t\t'plugincollection-plugin-name-conflict',\n\t\t\t\tnull,\n\t\t\t\t{ pluginName, plugin1: this._plugins.get( pluginName ).constructor, plugin2: PluginConstructor }\n\t\t\t);\n\t\t}\n\n\t\tthis._plugins.set( pluginName, plugin );\n\t}\n}\n\nmix( PluginCollection, EmitterMixin );\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module utils/toarray\n */\n\n/**\n * Transforms any value to an array. If the provided value is already an array, it is returned unchanged.\n *\n * @param {*} data Value to transform to an array.\n * @returns {Array} Array created from data.\n */\nexport default function toArray( data ) {\n\treturn Array.isArray( data ) ? data : [ data ];\n}\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/* globals window */\n\n/**\n * @module utils/translation-service\n */\n\nimport CKEditorError from './ckeditorerror';\n\n/* istanbul ignore else */\nif ( !window.CKEDITOR_TRANSLATIONS ) {\n\twindow.CKEDITOR_TRANSLATIONS = {};\n}\n\n/**\n * Adds translations to existing ones or overrides the existing translations. These translations will later\n * be available for the {@link module:utils/locale~Locale#t `t()`} function.\n *\n * The `translations` is an object which consists of `messageId: translation` pairs. Note that the message ID can be\n * either constructed from the message string or from the message ID if it was passed\n * (this happens rarely and mostly for short messages or messages with placeholders).\n * Since the editor displays only the message string, the message ID can be found either in the source code or in the\n * built translations for another language.\n *\n *\t\tadd( 'pl', {\n *\t\t\t'Cancel': 'Anuluj',\n *\t\t\t'IMAGE': 'obraz', // Note that the `IMAGE` comes from the message ID, while the string can be `image`.\n *\t\t} );\n *\n * If the message is supposed to support various plural forms, make sure to provide an array with the singular form and all plural forms:\n *\n *\t\tadd( 'pl', {\n *\t \t\t'Add space': [ 'Dodaj spację', 'Dodaj %0 spacje', 'Dodaj %0 spacji' ]\n * \t\t} );\n *\n * You should also specify the third argument (the `getPluralForm()` function) that will be used to determine the plural form if no\n * language file was loaded for that language. All language files coming from CKEditor 5 sources will have this option set, so\n * these plural form rules will be reused by other translations added to the registered languages. The `getPluralForm()` function\n * can return either a Boolean or a number.\n *\n * \t\tadd( 'en', {\n *\t \t\t// ... Translations.\n * \t\t}, n => n !== 1 );\n * \t\tadd( 'pl', {\n *\t \t\t// ... Translations.\n * \t\t}, n => n == 1 ? 0 : n % 10 >= 2 && n % 10 <= 4 && ( n % 100 < 10 || n % 100 >= 20 ) ? 1 : 2 );\n *\n * All translations extend the global `window.CKEDITOR_TRANSLATIONS` object. An example of this object can be found below:\n *\n * \t\t{\n * \t\t\tpl: {\n *\t\t\t\tdictionary: {\n *\t\t\t\t\t'Cancel': 'Anuluj',\n *\t\t\t\t\t'Add space': [ 'Dodaj spację', 'Dodaj %0 spacje', 'Dodaj %0 spacji' ]\n *\t\t\t\t},\n *\t\t\t\t// A function that returns the plural form index.\n *\t\t\t\tgetPluralForm: n => n !==1\n *\t\t\t}\n *\t\t\t// Other languages.\n *\t\t}\n *\n * If you cannot import this function from this module (e.g. because you use a CKEditor 5 build), you can\n * still add translations by extending the global `window.CKEDITOR_TRANSLATIONS` object by using a function like\n * the one below:\n *\n *\t\tfunction addTranslations( language, translations, getPluralForm ) {\n *\t\t\tif ( !window.CKEDITOR_TRANSLATIONS ) {\n *\t\t\t\twindow.CKEDITOR_TRANSLATIONS = {};\n *\t\t\t}\n\n *\t\t\tif ( !window.CKEDITOR_TRANSLATIONS[ language ] ) {\n *\t\t\t\twindow.CKEDITOR_TRANSLATIONS[ language ] = {};\n *\t\t\t}\n *\n *\t\t\tconst languageTranslations = window.CKEDITOR_TRANSLATIONS[ language ];\n *\n * \t\t\tlanguageTranslations.dictionary = languageTranslations.dictionary || {};\n * \t\t\tlanguageTranslations.getPluralForm = getPluralForm || languageTranslations.getPluralForm;\n *\n *\t\t\t// Extend the dictionary for the given language.\n *\t\t\tObject.assign( languageTranslations.dictionary, translations );\n *\t\t}\n *\n * @param {String} language Target language.\n * @param {Object.<String,*>} translations An object with translations which will be added to the dictionary.\n * For each message ID the value should be either a translation or an array of translations if the message\n * should support plural forms.\n * @param {Function} getPluralForm A function that returns the plural form index (a number).\n */\nexport function add( language, translations, getPluralForm ) {\n\tif ( !window.CKEDITOR_TRANSLATIONS[ language ] ) {\n\t\twindow.CKEDITOR_TRANSLATIONS[ language ] = {};\n\t}\n\n\tconst languageTranslations = window.CKEDITOR_TRANSLATIONS[ language ];\n\n\tlanguageTranslations.dictionary = languageTranslations.dictionary || {};\n\tlanguageTranslations.getPluralForm = getPluralForm || languageTranslations.getPluralForm;\n\n\tObject.assign( languageTranslations.dictionary, translations );\n}\n\n/**\n * **Note:** This method is internal, use {@link module:utils/locale~Locale#t the `t()` function} instead to translate\n * the editor UI parts.\n *\n * This function is responsible for translating messages to the specified language. It uses translations added perviously\n * by {@link module:utils/translation-service~add} (a translations dictionary and the `getPluralForm()` function\n * to provide accurate translations of plural forms).\n *\n * When no translation is defined in the dictionary or the dictionary does not exist, this function returns\n * the original message string or the message plural depending on the number of elements.\n *\n *\t\ttranslate( 'pl', { string: 'Cancel' } ); // 'Cancel'\n *\n * The third optional argument is the number of elements, based on which the single form or one of the plural forms\n * should be picked when the message is supposed to support various plural forms.\n *\n * \t\ttranslate( 'en', { string: 'Add a space', plural: 'Add %0 spaces' }, 1 ); // 'Add a space'\n * \t\ttranslate( 'en', { string: 'Add a space', plural: 'Add %0 spaces' }, 3 ); // 'Add %0 spaces'\n *\n * The message should provide an ID using the `id` property when the message strings are not unique and their\n * translations should be different.\n *\n *\t\ttranslate( 'en', { string: 'image', id: 'ADD_IMAGE' } );\n *\t\ttranslate( 'en', { string: 'image', id: 'AN_IMAGE' } );\n *\n * @protected\n * @param {String} language Target language.\n * @param {module:utils/translation-service~Message|String} message A message that will be translated.\n * @param {Number} [quantity] The number of elements for which a plural form should be picked from the target language dictionary.\n * @returns {String} Translated sentence.\n */\nexport function _translate( language, message, quantity = 1 ) {\n\tif ( typeof quantity !== 'number' ) {\n\t\t/**\n\t\t * An incorrect value was passed to the translation function. This was probably caused\n\t\t * by an incorrect message interpolation of a plural form. Note that for messages supporting plural forms\n\t\t * the second argument of the `t()` function should always be a number or an array with a number as the first element.\n\t\t *\n\t\t * @error translation-service-quantity-not-a-number\n\t\t */\n\t\tthrow new CKEditorError( 'translation-service-quantity-not-a-number', null, { quantity } );\n\t}\n\n\tconst numberOfLanguages = getNumberOfLanguages();\n\n\tif ( numberOfLanguages === 1 ) {\n\t\t// Override the language to the only supported one.\n\t\t// This can't be done in the `Locale` class, because the translations comes after the `Locale` class initialization.\n\t\tlanguage = Object.keys( window.CKEDITOR_TRANSLATIONS )[ 0 ];\n\t}\n\n\tconst messageId = message.id || message.string;\n\n\tif ( numberOfLanguages === 0 || !hasTranslation( language, messageId ) ) {\n\t\tif ( quantity !== 1 ) {\n\t\t\t// Return the default plural form that was passed in the `message.plural` parameter.\n\t\t\treturn message.plural;\n\t\t}\n\n\t\treturn message.string;\n\t}\n\n\tconst dictionary = window.CKEDITOR_TRANSLATIONS[ language ].dictionary;\n\tconst getPluralForm = window.CKEDITOR_TRANSLATIONS[ language ].getPluralForm || ( n => n === 1 ? 0 : 1 );\n\n\tif ( typeof dictionary[ messageId ] === 'string' ) {\n\t\treturn dictionary[ messageId ];\n\t}\n\n\tconst pluralFormIndex = Number( getPluralForm( quantity ) );\n\n\t// Note: The `translate` function is not responsible for replacing `%0, %1, ...` with values.\n\treturn dictionary[ messageId ][ pluralFormIndex ];\n}\n\n/**\n * Clears dictionaries for test purposes.\n *\n * @protected\n */\nexport function _clear() {\n\twindow.CKEDITOR_TRANSLATIONS = {};\n}\n\n// Checks whether the dictionary exists and translation in that dictionary exists.\nfunction hasTranslation( language, messageId ) {\n\treturn (\n\t\t!!window.CKEDITOR_TRANSLATIONS[ language ] &&\n\t\t!!window.CKEDITOR_TRANSLATIONS[ language ].dictionary[ messageId ]\n\t);\n}\n\nfunction getNumberOfLanguages() {\n\treturn Object.keys( window.CKEDITOR_TRANSLATIONS ).length;\n}\n\n/**\n * The internationalization message interface. A message that implements this interface can be passed to the `t()` function\n * to be translated to the target UI language.\n *\n * @typedef {Object} module:utils/translation-service~Message\n *\n * @property {String} string The message string to translate. Acts as a default translation if the translation for a given language\n * is not defined. When the message is supposed to support plural forms, the string should be the English singular form of the message.\n * @property {String} [id] The message ID. If passed, the message ID is taken from this property instead of the `message.string`.\n * This property is useful when various messages share the same message string, for example, the `editor` string in `in the editor`\n * and `my editor` sentences.\n * @property {String} [plural] The plural form of the message. This property should be skipped when a message is not supposed\n * to support plural forms. Otherwise it should always be set to a string with the English plural form of the message.\n */\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module utils/locale\n */\n\n/* globals console */\n\nimport toArray from './toarray';\nimport { _translate } from './translation-service';\n\nconst RTL_LANGUAGE_CODES = [ 'ar', 'fa', 'he', 'ku', 'ug' ];\n\n/**\n * Represents the localization services.\n */\nexport default class Locale {\n\t/**\n\t * Creates a new instance of the locale class. Learn more about\n\t * {@glink features/ui-language configuring the language of the editor}.\n\t *\n\t * @param {Object} [options] Locale configuration.\n\t * @param {String} [options.uiLanguage='en'] The editor UI language code in the\n\t * [ISO 639-1](https://en.wikipedia.org/wiki/ISO_639-1) format. See {@link #uiLanguage}.\n\t * @param {String} [options.contentLanguage] The editor content language code in the\n\t * [ISO 639-1](https://en.wikipedia.org/wiki/ISO_639-1) format. If not specified, the same as `options.language`.\n\t * See {@link #contentLanguage}.\n\t */\n\tconstructor( options = {} ) {\n\t\t/**\n\t\t * The editor UI language code in the [ISO 639-1](https://en.wikipedia.org/wiki/ISO_639-1) format.\n\t\t *\n\t\t * If the {@link #contentLanguage content language} was not specified in the `Locale` constructor,\n\t\t * it also defines the language of the content.\n\t\t *\n\t\t * @readonly\n\t\t * @member {String}\n\t\t */\n\t\tthis.uiLanguage = options.uiLanguage || 'en';\n\n\t\t/**\n\t\t * The editor content language code in the [ISO 639-1](https://en.wikipedia.org/wiki/ISO_639-1) format.\n\t\t *\n\t\t * Usually the same as the {@link #uiLanguage editor language}, it can be customized by passing an optional\n\t\t * argument to the `Locale` constructor.\n\t\t *\n\t\t * @readonly\n\t\t * @member {String}\n\t\t */\n\t\tthis.contentLanguage = options.contentLanguage || this.uiLanguage;\n\n\t\t/**\n\t\t * Text direction of the {@link #uiLanguage editor UI language}. Either `'ltr'` or `'rtl'`.\n\t\t *\n\t\t * @readonly\n\t\t * @member {String}\n\t\t */\n\t\tthis.uiLanguageDirection = getLanguageDirection( this.uiLanguage );\n\n\t\t/**\n\t\t * Text direction of the {@link #contentLanguage editor content language}.\n\t\t *\n\t\t * If the content language was passed directly to the `Locale` constructor, this property represents the\n\t\t * direction of that language.\n\t\t *\n\t\t * If the {@link #contentLanguage editor content language} was derived from the {@link #uiLanguage editor language},\n\t\t * the content language direction is the same as the {@link #uiLanguageDirection UI language direction}.\n\t\t *\n\t\t * The value is either `'ltr'` or `'rtl'`.\n\t\t *\n\t\t * @readonly\n\t\t * @member {String}\n\t\t */\n\t\tthis.contentLanguageDirection = getLanguageDirection( this.contentLanguage );\n\n\t\t/**\n\t\t * Translates the given message to the {@link #uiLanguage}. This method is also available in\n\t\t * {@link module:core/editor/editor~Editor#t `Editor`} and {@link module:ui/view~View#t `View`}.\n\t\t *\n\t\t * This method's context is statically bound to the `Locale` instance and **should always be called as a function**:\n\t\t *\n\t\t *\t\tconst t = locale.t;\n\t\t *\t\tt( 'Label' );\n\t\t *\n\t\t * The message can be either a string or an object implementing the {@link module:utils/translation-service~Message} interface.\n\t\t *\n\t\t * The message may contain placeholders (`%<index>`) for value(s) that are passed as a `values` parameter.\n\t\t * For an array of values, the `%<index>` will be changed to an element of that array at the given index.\n\t\t * For a single value passed as the second argument, only the `%0` placeholders will be changed to the provided value.\n\t\t *\n\t\t *\t\tt( 'Created file \"%0\" in %1ms.', [ fileName, timeTaken ] );\n\t\t * \t\tt( 'Created file \"%0\", fileName );\n\t\t *\n\t\t * The message supports plural forms. To specify the plural form, use the `plural` property. Singular or plural form\n\t\t * will be chosen depending on the first value from the passed `values`. The value of the `plural` property is used\n\t\t * as a default plural translation when the translation for the target language is missing.\n\t\t *\n\t\t *\t\tt( { string: 'Add a space', plural: 'Add %0 spaces' }, 1 ); // 'Add a space' for the English language.\n\t\t *\t\tt( { string: 'Add a space', plural: 'Add %0 spaces' }, 5 ); // 'Add 5 spaces' for the English language.\n\t\t *\t\tt( { string: '%1 a space', plural: '%1 %0 spaces' }, [ 2, 'Add' ] ); // 'Add 2 spaces' for the English language.\n\t\t *\n\t\t * \t\tt( { string: 'Add a space', plural: 'Add %0 spaces' }, 1 ); // 'Dodaj spację' for the Polish language.\n\t\t *\t\tt( { string: 'Add a space', plural: 'Add %0 spaces' }, 5 ); // 'Dodaj 5 spacji' for the Polish language.\n\t\t *\t\tt( { string: '%1 a space', plural: '%1 %0 spaces' }, [ 2, 'Add' ] ); // 'Dodaj 2 spacje' for the Polish language.\n\t\t *\n\t\t *  * The message should provide an ID using the `id` property when the message strings are not unique and their\n\t\t * translations should be different.\n\t\t *\n\t\t *\t\ttranslate( 'en', { string: 'image', id: 'ADD_IMAGE' } );\n\t\t *\t\ttranslate( 'en', { string: 'image', id: 'AN_IMAGE' } );\n\t\t *\n\t\t * @method #t\n\t\t * @param {String|module:utils/translation-service~Message} message A message that will be localized (translated).\n\t\t * @param {String|Number|Array.<String|Number>} [values] A value or an array of values that will fill message placeholders.\n\t\t * For messages supporting plural forms the first value will determine the plural form.\n\t\t * @returns {String}\n\t\t */\n\t\tthis.t = ( message, values ) => this._t( message, values );\n\t}\n\n\t/**\n\t * The editor UI language code in the [ISO 639-1](https://en.wikipedia.org/wiki/ISO_639-1) format.\n\t *\n\t * **Note**: This property was deprecated. Please use {@link #uiLanguage} and {@link #contentLanguage}\n\t * properties instead.\n\t *\n\t * @deprecated\n\t * @member {String}\n\t */\n\tget language() {\n\t\t/**\n\t\t * The {@link module:utils/locale~Locale#language `Locale#language`} property was deprecated and will\n\t\t * be removed in the near future. Please use the {@link #uiLanguage} and {@link #contentLanguage} properties instead.\n\t\t *\n\t\t * @error locale-deprecated-language-property\n\t\t */\n\t\tconsole.warn(\n\t\t\t'locale-deprecated-language-property: ' +\n\t\t\t'The Locale#language property has been deprecated and will be removed in the near future. ' +\n\t\t\t'Please use #uiLanguage and #contentLanguage properties instead.' );\n\n\t\treturn this.uiLanguage;\n\t}\n\n\t/**\n\t * An unbound version of the {@link #t} method.\n\t *\n\t * @private\n\t * @param {String|module:utils/translation-service~Message} message\n\t * @param {Number|String|Array.<Number|String>} [values]\n\t * @returns {String}\n\t */\n\t_t( message, values = [] ) {\n\t\tvalues = toArray( values );\n\n\t\tif ( typeof message === 'string' ) {\n\t\t\tmessage = { string: message };\n\t\t}\n\n\t\tconst hasPluralForm = !!message.plural;\n\t\tconst quantity = hasPluralForm ? values[ 0 ] : 1;\n\n\t\tconst translatedString = _translate( this.uiLanguage, message, quantity );\n\n\t\treturn interpolateString( translatedString, values );\n\t}\n}\n\n// Fills the `%0, %1, ...` string placeholders with values.\nfunction interpolateString( string, values ) {\n\treturn string.replace( /%(\\d+)/g, ( match, index ) => {\n\t\treturn ( index < values.length ) ? values[ index ] : match;\n\t} );\n}\n\n// Helps determine whether a language is LTR or RTL.\n//\n// @param {String} language The ISO 639-1 language code.\n// @returns {String} 'ltr' or 'rtl\nfunction getLanguageDirection( languageCode ) {\n\treturn RTL_LANGUAGE_CODES.includes( languageCode ) ? 'rtl' : 'ltr';\n}\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module core/context\n */\n\nimport Config from '@ckeditor/ckeditor5-utils/src/config';\nimport Collection from '@ckeditor/ckeditor5-utils/src/collection';\nimport PluginCollection from './plugincollection';\nimport Locale from '@ckeditor/ckeditor5-utils/src/locale';\nimport CKEditorError from '@ckeditor/ckeditor5-utils/src/ckeditorerror';\n\n/**\n * Provides a common, higher-level environment for solutions that use multiple {@link module:core/editor/editor~Editor editors}\n * or plugins that work outside the editor. Use it instead of {@link module:core/editor/editor~Editor.create `Editor.create()`}\n * in advanced application integrations.\n *\n * All configuration options passed to a context will be used as default options for editor instances initialized in that context.\n *\n * {@link module:core/contextplugin~ContextPlugin Context plugins} passed to a context instance will be shared among all\n * editor instances initialized in this context. These will be the same plugin instances for all the editors.\n *\n * **Note:** The context can only be initialized with {@link module:core/contextplugin~ContextPlugin context plugins}\n * (e.g. [comments](https://ckeditor.com/collaboration/comments/)). Regular {@link module:core/plugin~Plugin plugins} require an\n * editor instance to work and cannot be added to a context.\n *\n * **Note:** You can add a context plugin to an editor instance, though.\n *\n * If you are using multiple editor instances on one page and use any context plugins, create a context to share the configuration and\n * plugins among these editors. Some plugins will use the information about all existing editors to better integrate between them.\n *\n * If you are using plugins that do not require an editor to work (e.g. [comments](https://ckeditor.com/collaboration/comments/)),\n * enable and configure them using the context.\n *\n * If you are using only a single editor on each page, use {@link module:core/editor/editor~Editor.create `Editor.create()`} instead.\n * In such case, a context instance will be created by the editor instance in a transparent way.\n *\n * See {@link module:core/context~Context.create `Context.create()`} for usage examples.\n */\nexport default class Context {\n\t/**\n\t * Creates a context instance with a given configuration.\n\t *\n\t * Usually not to be used directly. See the static {@link module:core/context~Context.create `create()`} method.\n\t *\n\t * @param {Object} [config={}] The context configuration.\n\t */\n\tconstructor( config ) {\n\t\t/**\n\t\t * Stores all the configurations specific to this context instance.\n\t\t *\n\t\t * @readonly\n\t\t * @type {module:utils/config~Config}\n\t\t */\n\t\tthis.config = new Config( config, this.constructor.defaultConfig );\n\n\t\tconst availablePlugins = this.constructor.builtinPlugins;\n\n\t\tthis.config.define( 'plugins', availablePlugins );\n\n\t\t/**\n\t\t * The plugins loaded and in use by this context instance.\n\t\t *\n\t\t * @readonly\n\t\t * @type {module:core/plugincollection~PluginCollection}\n\t\t */\n\t\tthis.plugins = new PluginCollection( this, availablePlugins );\n\n\t\tconst languageConfig = this.config.get( 'language' ) || {};\n\n\t\t/**\n\t\t * @readonly\n\t\t * @type {module:utils/locale~Locale}\n\t\t */\n\t\tthis.locale = new Locale( {\n\t\t\tuiLanguage: typeof languageConfig === 'string' ? languageConfig : languageConfig.ui,\n\t\t\tcontentLanguage: this.config.get( 'language.content' )\n\t\t} );\n\n\t\t/**\n\t\t * Shorthand for {@link module:utils/locale~Locale#t}.\n\t\t *\n\t\t * @see module:utils/locale~Locale#t\n\t\t * @method #t\n\t\t */\n\t\tthis.t = this.locale.t;\n\n\t\t/**\n\t\t * A list of editors that this context instance is injected to.\n\t\t *\n\t\t * @readonly\n\t\t * @type {module:utils/collection~Collection}\n\t\t */\n\t\tthis.editors = new Collection();\n\n\t\t/**\n\t\t * Reference to the editor which created the context.\n\t\t * Null when the context was created outside of the editor.\n\t\t *\n\t\t * It is used to destroy the context when removing the editor that has created the context.\n\t\t *\n\t\t * @private\n\t\t * @type {module:core/editor/editor~Editor|null}\n\t\t */\n\t\tthis._contextOwner = null;\n\t}\n\n\t/**\n\t * Loads and initializes plugins specified in the configuration.\n\t *\n\t * @returns {Promise.<module:core/plugin~LoadedPlugins>} A promise which resolves\n\t * once the initialization is completed, providing an array of loaded plugins.\n\t */\n\tinitPlugins() {\n\t\tconst plugins = this.config.get( 'plugins' ) || [];\n\n\t\tfor ( const Plugin of plugins ) {\n\t\t\tif ( typeof Plugin != 'function' ) {\n\t\t\t\t/**\n\t\t\t\t * Only a constructor function is allowed as a {@link module:core/contextplugin~ContextPlugin context plugin}.\n\t\t\t\t *\n\t\t\t\t * @error context-initplugins-constructor-only\n\t\t\t\t */\n\t\t\t\tthrow new CKEditorError(\n\t\t\t\t\t'context-initplugins-constructor-only',\n\t\t\t\t\tnull,\n\t\t\t\t\t{ Plugin }\n\t\t\t\t);\n\t\t\t}\n\n\t\t\tif ( Plugin.isContextPlugin !== true ) {\n\t\t\t\t/**\n\t\t\t\t * Only a plugin marked as a {@link module:core/contextplugin~ContextPlugin.isContextPlugin context plugin}\n\t\t\t\t * is allowed to be used with a context.\n\t\t\t\t *\n\t\t\t\t * @error context-initplugins-invalid-plugin\n\t\t\t\t */\n\t\t\t\tthrow new CKEditorError(\n\t\t\t\t\t'context-initplugins-invalid-plugin',\n\t\t\t\t\tnull,\n\t\t\t\t\t{ Plugin }\n\t\t\t\t);\n\t\t\t}\n\t\t}\n\n\t\treturn this.plugins.init( plugins );\n\t}\n\n\t/**\n\t * Destroys the context instance and all editors used with the context,\n\t * releasing all resources used by the context.\n\t *\n\t * @returns {Promise} A promise that resolves once the context instance is fully destroyed.\n\t */\n\tdestroy() {\n\t\treturn Promise.all( Array.from( this.editors, editor => editor.destroy() ) )\n\t\t\t.then( () => this.plugins.destroy() );\n\t}\n\n\t/**\n\t * Adds a reference to the editor which is used with this context.\n\t *\n\t * When the given editor has created the context, the reference to this editor will be stored\n\t * as a {@link ~Context#_contextOwner}.\n\t *\n\t * This method should only be used by the editor.\n\t *\n\t * @protected\n\t * @param {module:core/editor/editor~Editor} editor\n\t * @param {Boolean} isContextOwner Stores the given editor as a context owner.\n\t */\n\t_addEditor( editor, isContextOwner ) {\n\t\tif ( this._contextOwner ) {\n\t\t\t/**\n\t\t\t * Cannot add multiple editors to the context which is created by the editor.\n\t\t\t *\n\t\t\t * @error context-addeditor-private-context\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'context-addeditor-private-context' );\n\t\t}\n\n\t\tthis.editors.add( editor );\n\n\t\tif ( isContextOwner ) {\n\t\t\tthis._contextOwner = editor;\n\t\t}\n\t}\n\n\t/**\n\t * Removes a reference to the editor which was used with this context.\n\t * When the context was created by the given editor, the context will be destroyed.\n\t *\n\t * This method should only be used by the editor.\n\t *\n\t * @protected\n\t * @param {module:core/editor/editor~Editor} editor\n\t * @return {Promise} A promise that resolves once the editor is removed from the context or when the context was destroyed.\n\t */\n\t_removeEditor( editor ) {\n\t\tif ( this.editors.has( editor ) ) {\n\t\t\tthis.editors.remove( editor );\n\t\t}\n\n\t\tif ( this._contextOwner === editor ) {\n\t\t\treturn this.destroy();\n\t\t}\n\n\t\treturn Promise.resolve();\n\t}\n\n\t/**\n\t * Returns the context configuration which will be copied to the editors created using this context.\n\t *\n\t * The configuration returned by this method has the plugins configuration removed &mdash; plugins are shared with all editors\n\t * through another mechanism.\n\t *\n\t * This method should only be used by the editor.\n\t *\n\t * @protected\n\t * @returns {Object} Configuration as a plain object.\n\t */\n\t_getEditorConfig() {\n\t\tconst result = {};\n\n\t\tfor ( const name of this.config.names() ) {\n\t\t\tif ( ![ 'plugins', 'removePlugins', 'extraPlugins' ].includes( name ) ) {\n\t\t\t\tresult[ name ] = this.config.get( name );\n\t\t\t}\n\t\t}\n\n\t\treturn result;\n\t}\n\n\t/**\n\t * Creates and initializes a new context instance.\n\t *\n\t *\t\tconst commonConfig = { ... }; // Configuration for all the plugins and editors.\n\t *\t\tconst editorPlugins = [ ... ]; // Regular plugins here.\n\t *\n\t *\t\tContext\n\t *\t\t\t.create( {\n\t *\t\t\t\t// Only context plugins here.\n\t *\t\t\t\tplugins: [ ... ],\n\t *\n\t *\t\t\t\t// Configure the language for all the editors (it cannot be overwritten).\n\t *\t\t\t\tlanguage: { ... },\n\t *\n\t *\t\t\t\t// Configuration for context plugins.\n\t *\t\t\t\tcomments: { ... },\n\t *\t\t\t\t...\n\t *\n\t *\t\t\t\t// Default configuration for editor plugins.\n\t *\t\t\t\ttoolbar: { ... },\n\t *\t\t\t\timage: { ... },\n\t *\t\t\t\t...\n\t *\t\t\t} )\n\t *\t\t\t.then( context => {\n\t *\t\t\t\tconst promises = [];\n\t *\n\t *\t\t\t\tpromises.push( ClassicEditor.create(\n\t *\t\t\t\t\tdocument.getElementById( 'editor1' ),\n\t *\t\t\t\t\t{\n\t *\t\t\t\t\t\teditorPlugins,\n\t *\t\t\t\t\t\tcontext\n\t *\t\t\t\t\t}\n\t *\t\t\t\t) );\n\t *\n\t *\t\t\t\tpromises.push( ClassicEditor.create(\n\t *\t\t\t\t\tdocument.getElementById( 'editor2' ),\n\t *\t\t\t\t\t{\n\t *\t\t\t\t\t\teditorPlugins,\n\t *\t\t\t\t\t\tcontext,\n\t *\t\t\t\t\t\ttoolbar: { ... } // You can overwrite the configuration of the context.\n\t *\t\t\t\t\t}\n\t *\t\t\t\t) );\n\t *\n\t *\t\t\t\treturn Promise.all( promises );\n\t *\t\t\t} );\n\t *\n\t * @param {Object} [config] The context configuration.\n\t * @returns {Promise} A promise resolved once the context is ready. The promise resolves with the created context instance.\n\t */\n\tstatic create( config ) {\n\t\treturn new Promise( resolve => {\n\t\t\tconst context = new this( config );\n\n\t\t\tresolve( context.initPlugins().then( () => context ) );\n\t\t} );\n\t}\n}\n\n/**\n * An array of plugins built into the `Context` class.\n *\n * It is used in CKEditor 5 builds featuring `Context` to provide a list of context plugins which are later automatically initialized\n * during the context initialization.\n *\n * They will be automatically initialized by `Context` unless `config.plugins` is passed.\n *\n *\t\t// Build some context plugins into the Context class first.\n *\t\tContext.builtinPlugins = [ FooPlugin, BarPlugin ];\n *\n *\t\t// Normally, you need to define config.plugins, but since Context.builtinPlugins was\n *\t\t// defined, now you can call create() without any configuration.\n *\t\tContext\n *\t\t\t.create()\n *\t\t\t.then( context => {\n *\t\t\t\tcontext.plugins.get( FooPlugin ); // -> An instance of the Foo plugin.\n *\t\t\t\tcontext.plugins.get( BarPlugin ); // -> An instance of the Bar plugin.\n *\t\t\t} );\n *\n * See also {@link module:core/context~Context.defaultConfig `Context.defaultConfig`}\n * and {@link module:core/editor/editor~Editor.builtinPlugins `Editor.builtinPlugins`}.\n *\n * @static\n * @member {Array.<Function>} module:core/context~Context.builtinPlugins\n */\n\n/**\n * The default configuration which is built into the `Context` class.\n *\n * It is used in CKEditor 5 builds featuring `Context` to provide the default configuration options which are later used during the\n * context initialization.\n *\n *\t\tContext.defaultConfig = {\n *\t\t\tfoo: 1,\n *\t\t\tbar: 2\n *\t\t};\n *\n *\t\tContext\n *\t\t\t.create()\n *\t\t\t.then( context => {\n *\t\t\t\tcontext.config.get( 'foo' ); // -> 1\n *\t\t\t\tcontext.config.get( 'bar' ); // -> 2\n *\t\t\t} );\n *\n *\t\t// The default options can be overridden by the configuration passed to create().\n *\t\tContext\n *\t\t\t.create( { bar: 3 } )\n *\t\t\t.then( context => {\n *\t\t\t\tcontext.config.get( 'foo' ); // -> 1\n *\t\t\t\tcontext.config.get( 'bar' ); // -> 3\n *\t\t\t} );\n *\n * See also {@link module:core/context~Context.builtinPlugins `Context.builtinPlugins`}\n * and {@link module:core/editor/editor~Editor.defaultConfig `Editor.defaultConfig`}.\n *\n * @static\n * @member {Object} module:core/context~Context.defaultConfig\n */\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module utils/comparearrays\n */\n\n/**\n * Compares how given arrays relate to each other. One array can be: same as another array, prefix of another array\n * or completely different. If arrays are different, first index at which they differ is returned. Otherwise,\n * a flag specifying the relation is returned. Flags are negative numbers, so whenever a number >= 0 is returned\n * it means that arrays differ.\n *\n *\t\tcompareArrays( [ 0, 2 ], [ 0, 2 ] );\t\t// 'same'\n *\t\tcompareArrays( [ 0, 2 ], [ 0, 2, 1 ] );\t\t// 'prefix'\n *\t\tcompareArrays( [ 0, 2 ], [ 0 ] );\t\t\t// 'extension'\n *\t\tcompareArrays( [ 0, 2 ], [ 1, 2 ] );\t\t// 0\n *\t\tcompareArrays( [ 0, 2 ], [ 0, 1 ] );\t\t// 1\n *\n * @param {Array} a Array that is compared.\n * @param {Array} b Array to compare with.\n * @returns {module:utils/comparearrays~ArrayRelation} How array `a` is related to `b`.\n */\nexport default function compareArrays( a, b ) {\n\tconst minLen = Math.min( a.length, b.length );\n\n\tfor ( let i = 0; i < minLen; i++ ) {\n\t\tif ( a[ i ] != b[ i ] ) {\n\t\t\t// The arrays are different.\n\t\t\treturn i;\n\t\t}\n\t}\n\n\t// Both arrays were same at all points.\n\tif ( a.length == b.length ) {\n\t\t// If their length is also same, they are the same.\n\t\treturn 'same';\n\t} else if ( a.length < b.length ) {\n\t\t// Compared array is shorter so it is a prefix of the other array.\n\t\treturn 'prefix';\n\t} else {\n\t\t// Compared array is longer so it is an extension of the other array.\n\t\treturn 'extension';\n\t}\n}\n\n/**\n * @typedef {'extension'|'same'|'prefix'} module:utils/comparearrays~ArrayRelation\n */\n","import baseClone from './_baseClone.js';\n\n/** Used to compose bitmasks for cloning. */\nvar CLONE_SYMBOLS_FLAG = 4;\n\n/**\n * Creates a shallow clone of `value`.\n *\n * **Note:** This method is loosely based on the\n * [structured clone algorithm](https://mdn.io/Structured_clone_algorithm)\n * and supports cloning arrays, array buffers, booleans, date objects, maps,\n * numbers, `Object` objects, regexes, sets, strings, symbols, and typed\n * arrays. The own enumerable properties of `arguments` objects are cloned\n * as plain objects. An empty object is returned for uncloneable values such\n * as error objects, functions, DOM nodes, and WeakMaps.\n *\n * @static\n * @memberOf _\n * @since 0.1.0\n * @category Lang\n * @param {*} value The value to clone.\n * @returns {*} Returns the cloned value.\n * @see _.cloneDeep\n * @example\n *\n * var objects = [{ 'a': 1 }, { 'b': 2 }];\n *\n * var shallow = _.clone(objects);\n * console.log(shallow[0] === objects[0]);\n * // => true\n */\nfunction clone(value) {\n  return baseClone(value, CLONE_SYMBOLS_FLAG);\n}\n\nexport default clone;\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module engine/view/node\n */\n\nimport CKEditorError from '@ckeditor/ckeditor5-utils/src/ckeditorerror';\nimport EmitterMixin from '@ckeditor/ckeditor5-utils/src/emittermixin';\nimport mix from '@ckeditor/ckeditor5-utils/src/mix';\nimport compareArrays from '@ckeditor/ckeditor5-utils/src/comparearrays';\nimport { clone } from 'lodash-es';\n\n// To check if component is loaded more than once.\nimport '@ckeditor/ckeditor5-utils/src/version';\n\n/**\n * Abstract view node class.\n *\n * This is an abstract class. Its constructor should not be used directly.\n * Use the {@link module:engine/view/downcastwriter~DowncastWriter} or {@link module:engine/view/upcastwriter~UpcastWriter}\n * to create new instances of view nodes.\n *\n * @abstract\n */\nexport default class Node {\n\t/**\n\t * Creates a tree view node.\n\t *\n\t * @protected\n\t * @param {module:engine/view/document~Document} document The document instance to which this node belongs.\n\t */\n\tconstructor( document ) {\n\t\t/**\n\t\t * The document instance to which this node belongs.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:engine/view/document~Document}\n\t\t */\n\t\tthis.document = document;\n\n\t\t/**\n\t\t * Parent element. Null by default. Set by {@link module:engine/view/element~Element#_insertChild}.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:engine/view/element~Element|module:engine/view/documentfragment~DocumentFragment|null}\n\t\t */\n\t\tthis.parent = null;\n\t}\n\n\t/**\n\t * Index of the node in the parent element or null if the node has no parent.\n\t *\n\t * Accessing this property throws an error if this node's parent element does not contain it.\n\t * This means that view tree got broken.\n\t *\n\t * @readonly\n\t * @type {Number|null}\n\t */\n\tget index() {\n\t\tlet pos;\n\n\t\tif ( !this.parent ) {\n\t\t\treturn null;\n\t\t}\n\n\t\t// No parent or child doesn't exist in parent's children.\n\t\tif ( ( pos = this.parent.getChildIndex( this ) ) == -1 ) {\n\t\t\t/**\n\t\t\t * The node's parent does not contain this node. It means that the document tree is corrupted.\n\t\t\t *\n\t\t\t * @error view-node-not-found-in-parent\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'view-node-not-found-in-parent', this );\n\t\t}\n\n\t\treturn pos;\n\t}\n\n\t/**\n\t * Node's next sibling, or `null` if it is the last child.\n\t *\n\t * @readonly\n\t * @type {module:engine/view/node~Node|null}\n\t */\n\tget nextSibling() {\n\t\tconst index = this.index;\n\n\t\treturn ( index !== null && this.parent.getChild( index + 1 ) ) || null;\n\t}\n\n\t/**\n\t * Node's previous sibling, or `null` if it is the first child.\n\t *\n\t * @readonly\n\t * @type {module:engine/view/node~Node|null}\n\t */\n\tget previousSibling() {\n\t\tconst index = this.index;\n\n\t\treturn ( index !== null && this.parent.getChild( index - 1 ) ) || null;\n\t}\n\n\t/**\n\t * Top-most ancestor of the node. If the node has no parent it is the root itself.\n\t *\n\t * @readonly\n\t * @type {module:engine/view/node~Node|module:engine/view/documentfragment~DocumentFragment}\n\t */\n\tget root() {\n\t\tlet root = this; // eslint-disable-line consistent-this\n\n\t\twhile ( root.parent ) {\n\t\t\troot = root.parent;\n\t\t}\n\n\t\treturn root;\n\t}\n\n\t/**\n\t * Returns true if the node is in a tree rooted in the document (is a descendant of one of its roots).\n\t *\n\t * @returns {Boolean}\n\t */\n\tisAttached() {\n\t\treturn this.root.is( 'rootElement' );\n\t}\n\n\t/**\n\t * Gets a path to the node. The path is an array containing indices of consecutive ancestors of this node,\n\t * beginning from {@link module:engine/view/node~Node#root root}, down to this node's index.\n\t *\n\t *\t\tconst abc = downcastWriter.createText( 'abc' );\n\t *\t\tconst foo = downcastWriter.createText( 'foo' );\n\t *\t\tconst h1 = downcastWriter.createElement( 'h1', null, downcastWriter.createText( 'header' ) );\n\t *\t\tconst p = downcastWriter.createElement( 'p', null, [ abc, foo ] );\n\t *\t\tconst div = downcastWriter.createElement( 'div', null, [ h1, p ] );\n\t *\t\tfoo.getPath(); // Returns [ 1, 3 ]. `foo` is in `p` which is in `div`. `p` starts at offset 1, while `foo` at 3.\n\t *\t\th1.getPath(); // Returns [ 0 ].\n\t *\t\tdiv.getPath(); // Returns [].\n\t *\n\t * @returns {Array.<Number>} The path.\n\t */\n\tgetPath() {\n\t\tconst path = [];\n\t\tlet node = this; // eslint-disable-line consistent-this\n\n\t\twhile ( node.parent ) {\n\t\t\tpath.unshift( node.index );\n\t\t\tnode = node.parent;\n\t\t}\n\n\t\treturn path;\n\t}\n\n\t/**\n\t * Returns ancestors array of this node.\n\t *\n\t * @param {Object} options Options object.\n\t * @param {Boolean} [options.includeSelf=false] When set to `true` this node will be also included in parent's array.\n\t * @param {Boolean} [options.parentFirst=false] When set to `true`, array will be sorted from node's parent to root element,\n\t * otherwise root element will be the first item in the array.\n\t * @returns {Array} Array with ancestors.\n\t */\n\tgetAncestors( options = { includeSelf: false, parentFirst: false } ) {\n\t\tconst ancestors = [];\n\t\tlet parent = options.includeSelf ? this : this.parent;\n\n\t\twhile ( parent ) {\n\t\t\tancestors[ options.parentFirst ? 'push' : 'unshift' ]( parent );\n\t\t\tparent = parent.parent;\n\t\t}\n\n\t\treturn ancestors;\n\t}\n\n\t/**\n\t * Returns a {@link module:engine/view/element~Element} or {@link module:engine/view/documentfragment~DocumentFragment}\n\t * which is a common ancestor of both nodes.\n\t *\n\t * @param {module:engine/view/node~Node} node The second node.\n\t * @param {Object} options Options object.\n\t * @param {Boolean} [options.includeSelf=false] When set to `true` both nodes will be considered \"ancestors\" too.\n\t * Which means that if e.g. node A is inside B, then their common ancestor will be B.\n\t * @returns {module:engine/view/element~Element|module:engine/view/documentfragment~DocumentFragment|null}\n\t */\n\tgetCommonAncestor( node, options = {} ) {\n\t\tconst ancestorsA = this.getAncestors( options );\n\t\tconst ancestorsB = node.getAncestors( options );\n\n\t\tlet i = 0;\n\n\t\twhile ( ancestorsA[ i ] == ancestorsB[ i ] && ancestorsA[ i ] ) {\n\t\t\ti++;\n\t\t}\n\n\t\treturn i === 0 ? null : ancestorsA[ i - 1 ];\n\t}\n\n\t/**\n\t * Returns whether this node is before given node. `false` is returned if nodes are in different trees (for example,\n\t * in different {@link module:engine/view/documentfragment~DocumentFragment}s).\n\t *\n\t * @param {module:engine/view/node~Node} node Node to compare with.\n\t * @returns {Boolean}\n\t */\n\tisBefore( node ) {\n\t\t// Given node is not before this node if they are same.\n\t\tif ( this == node ) {\n\t\t\treturn false;\n\t\t}\n\n\t\t// Return `false` if it is impossible to compare nodes.\n\t\tif ( this.root !== node.root ) {\n\t\t\treturn false;\n\t\t}\n\n\t\tconst thisPath = this.getPath();\n\t\tconst nodePath = node.getPath();\n\n\t\tconst result = compareArrays( thisPath, nodePath );\n\n\t\tswitch ( result ) {\n\t\t\tcase 'prefix':\n\t\t\t\treturn true;\n\n\t\t\tcase 'extension':\n\t\t\t\treturn false;\n\n\t\t\tdefault:\n\t\t\t\treturn thisPath[ result ] < nodePath[ result ];\n\t\t}\n\t}\n\n\t/**\n\t * Returns whether this node is after given node. `false` is returned if nodes are in different trees (for example,\n\t * in different {@link module:engine/view/documentfragment~DocumentFragment}s).\n\t *\n\t * @param {module:engine/view/node~Node} node Node to compare with.\n\t * @returns {Boolean}\n\t */\n\tisAfter( node ) {\n\t\t// Given node is not before this node if they are same.\n\t\tif ( this == node ) {\n\t\t\treturn false;\n\t\t}\n\n\t\t// Return `false` if it is impossible to compare nodes.\n\t\tif ( this.root !== node.root ) {\n\t\t\treturn false;\n\t\t}\n\n\t\t// In other cases, just check if the `node` is before, and return the opposite.\n\t\treturn !this.isBefore( node );\n\t}\n\n\t/**\n\t * Removes node from parent.\n\t *\n\t * @protected\n\t */\n\t_remove() {\n\t\tthis.parent._removeChildren( this.index );\n\t}\n\n\t/**\n\t * @protected\n\t * @param {module:engine/view/document~ChangeType} type Type of the change.\n\t * @param {module:engine/view/node~Node} node Changed node.\n\t * @fires change\n\t */\n\t_fireChange( type, node ) {\n\t\tthis.fire( 'change:' + type, node );\n\n\t\tif ( this.parent ) {\n\t\t\tthis.parent._fireChange( type, node );\n\t\t}\n\t}\n\n\t/**\n\t * Custom toJSON method to solve child-parent circular dependencies.\n\t *\n\t * @returns {Object} Clone of this object with the parent property removed.\n\t */\n\ttoJSON() {\n\t\tconst json = clone( this );\n\n\t\t// Due to circular references we need to remove parent reference.\n\t\tdelete json.parent;\n\n\t\treturn json;\n\t}\n\n\t/**\n\t * Checks whether this object is of the given type.\n\t *\n\t * This method is useful when processing view objects that are of unknown type. For example, a function\n\t * may return a {@link module:engine/view/documentfragment~DocumentFragment} or a {@link module:engine/view/node~Node}\n\t * that can be either a text node or an element. This method can be used to check what kind of object is returned.\n\t *\n\t *\t\tsomeObject.is( 'element' ); // -> true if this is an element\n\t *\t\tsomeObject.is( 'node' ); // -> true if this is a node (a text node or an element)\n\t *\t\tsomeObject.is( 'documentFragment' ); // -> true if this is a document fragment\n\t *\n\t * Since this method is also available on a range of model objects, you can prefix the type of the object with\n\t * `model:` or `view:` to check, for example, if this is the model's or view's element:\n\t *\n\t *\t\tviewElement.is( 'view:element' ); // -> true\n\t *\t\tviewElement.is( 'model:element' ); // -> false\n\t *\n\t * By using this method it is also possible to check a name of an element:\n\t *\n\t *\t\timgElement.is( 'element', 'img' ); // -> true\n\t *\t\timgElement.is( 'view:element', 'img' ); // -> same as above, but more precise\n\t *\n\t * The list of view objects which implement the `is()` method:\n\t *\n\t * * {@link module:engine/view/attributeelement~AttributeElement#is `AttributeElement#is()`}\n\t * * {@link module:engine/view/containerelement~ContainerElement#is `ContainerElement#is()`}\n\t * * {@link module:engine/view/documentfragment~DocumentFragment#is `DocumentFragment#is()`}\n\t * * {@link module:engine/view/documentselection~DocumentSelection#is `DocumentSelection#is()`}\n\t * * {@link module:engine/view/editableelement~EditableElement#is `EditableElement#is()`}\n\t * * {@link module:engine/view/element~Element#is `Element#is()`}\n\t * * {@link module:engine/view/emptyelement~EmptyElement#is `EmptyElement#is()`}\n\t * * {@link module:engine/view/node~Node#is `Node#is()`}\n\t * * {@link module:engine/view/position~Position#is `Position#is()`}\n\t * * {@link module:engine/view/range~Range#is `Range#is()`}\n\t * * {@link module:engine/view/rooteditableelement~RootEditableElement#is `RootEditableElement#is()`}\n\t * * {@link module:engine/view/selection~Selection#is `Selection#is()`}\n\t * * {@link module:engine/view/text~Text#is `Text#is()`}\n\t * * {@link module:engine/view/textproxy~TextProxy#is `TextProxy#is()`}\n\t * * {@link module:engine/view/uielement~UIElement#is `UIElement#is()`}\n\t *\n\t * @method #is\n\t * @param {String} type Type to check.\n\t * @returns {Boolean}\n\t */\n\tis( type ) {\n\t\treturn type === 'node' || type === 'view:node';\n\t}\n\n\t/**\n\t * Clones this node.\n\t *\n\t * @protected\n\t * @method #_clone\n\t * @returns {module:engine/view/node~Node} Clone of this node.\n\t */\n\n\t/**\n\t * Checks if provided node is similar to this node.\n\t *\n\t * @method #isSimilar\n\t * @returns {Boolean} True if nodes are similar.\n\t */\n}\n\n/**\n * Fired when list of {@link module:engine/view/element~Element elements} children changes.\n *\n * Change event is bubbled – it is fired on all ancestors.\n *\n * @event change:children\n * @param {module:engine/view/node~Node} changedNode\n */\n\n/**\n * Fired when list of {@link module:engine/view/element~Element elements} attributes changes.\n *\n * Change event is bubbled – it is fired on all ancestors.\n *\n * @event change:attributes\n * @param {module:engine/view/node~Node} changedNode\n */\n\n/**\n * Fired when {@link module:engine/view/text~Text text nodes} data changes.\n *\n * Change event is bubbled – it is fired on all ancestors.\n *\n * @event change:text\n * @param {module:engine/view/node~Node} changedNode\n */\n\n/**\n * @event change\n */\n\nmix( Node, EmitterMixin );\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module engine/view/text\n */\n\nimport Node from './node';\n\n/**\n * Tree view text node.\n *\n * The constructor of this class should not be used directly. To create a new text node instance\n * use the {@link module:engine/view/downcastwriter~DowncastWriter#createText `DowncastWriter#createText()`}\n * method when working on data downcasted from the model or the\n * {@link module:engine/view/upcastwriter~UpcastWriter#createText `UpcastWriter#createText()`}\n * method when working on non-semantic views.\n *\n * @extends module:engine/view/node~Node\n */\nexport default class Text extends Node {\n\t/**\n\t * Creates a tree view text node.\n\t *\n\t * @protected\n\t * @param {module:engine/view/document~Document} document The document instance to which this text node belongs.\n\t * @param {String} data The text's data.\n\t */\n\tconstructor( document, data ) {\n\t\tsuper( document );\n\n\t\t/**\n\t\t * The text content.\n\t\t *\n\t\t * Setting the data fires the {@link module:engine/view/node~Node#event:change:text change event}.\n\t\t *\n\t\t * @protected\n\t\t * @member {String} module:engine/view/text~Text#_textData\n\t\t */\n\t\tthis._textData = data;\n\t}\n\n\t/**\n\t * Checks whether this object is of the given type.\n\t *\n\t *\t\ttext.is( '$text' ); // -> true\n\t *\t\ttext.is( 'node' ); // -> true\n\t *\t\ttext.is( 'view:$text' ); // -> true\n\t *\t\ttext.is( 'view:node' ); // -> true\n\t *\n\t *\t\ttext.is( 'model:$text' ); // -> false\n\t *\t\ttext.is( 'element' ); // -> false\n\t *\t\ttext.is( 'range' ); // -> false\n\t *\n\t * {@link module:engine/view/node~Node#is Check the entire list of view objects} which implement the `is()` method.\n\t *\n\t * **Note:** Until version 20.0.0 this method wasn't accepting `'$text'` type. The legacy `'text'` type is still\n\t * accepted for backward compatibility.\n\t *\n\t * @param {String} type Type to check.\n\t * @returns {Boolean}\n\t */\n\tis( type ) {\n\t\treturn type === '$text' || type === 'view:$text' ||\n\t\t\t// This are legacy values kept for backward compatibility.\n\t\t\ttype === 'text' || type === 'view:text' ||\n\t\t\t// From super.is(). This is highly utilised method and cannot call super. See ckeditor/ckeditor5#6529.\n\t\t\ttype === 'node' || type === 'view:node';\n\t}\n\n\t/**\n\t * The text content.\n\t *\n\t * @readonly\n\t * @type {String}\n\t */\n\tget data() {\n\t\treturn this._textData;\n\t}\n\n\t/**\n\t * The `_data` property is controlled by a getter and a setter.\n\t *\n\t * The getter is required when using the addition assignment operator on protected property:\n\t *\n\t *\t\tconst foo = downcastWriter.createText( 'foo' );\n\t *\t\tconst bar = downcastWriter.createText( 'bar' );\n\t *\n\t *\t\tfoo._data += bar.data;   // executes: `foo._data = foo._data + bar.data`\n\t *\t\tconsole.log( foo.data ); // prints: 'foobar'\n\t *\n\t * If the protected getter didn't exist, `foo._data` will return `undefined` and result of the merge will be invalid.\n\t *\n\t * The setter sets data and fires the {@link module:engine/view/node~Node#event:change:text change event}.\n\t *\n\t * @protected\n\t * @type {String}\n\t */\n\tget _data() {\n\t\treturn this.data;\n\t}\n\n\tset _data( data ) {\n\t\tthis._fireChange( 'text', this );\n\n\t\tthis._textData = data;\n\t}\n\n\t/**\n\t * Checks if this text node is similar to other text node.\n\t * Both nodes should have the same data to be considered as similar.\n\t *\n\t * @param {module:engine/view/text~Text} otherNode Node to check if it is same as this node.\n\t * @returns {Boolean}\n\t */\n\tisSimilar( otherNode ) {\n\t\tif ( !( otherNode instanceof Text ) ) {\n\t\t\treturn false;\n\t\t}\n\n\t\treturn this === otherNode || this.data === otherNode.data;\n\t}\n\n\t/**\n\t * Clones this node.\n\t *\n\t * @protected\n\t * @returns {module:engine/view/text~Text} Text node that is a clone of this node.\n\t */\n\t_clone() {\n\t\treturn new Text( this.document, this.data );\n\t}\n\n\t// @if CK_DEBUG_ENGINE // toString() {\n\t// @if CK_DEBUG_ENGINE // \treturn `#${ this.data }`;\n\t// @if CK_DEBUG_ENGINE // }\n\n\t// @if CK_DEBUG_ENGINE // log() {\n\t// @if CK_DEBUG_ENGINE // \tconsole.log( 'ViewText: ' + this );\n\t// @if CK_DEBUG_ENGINE // }\n\n\t// @if CK_DEBUG_ENGINE // logExtended() {\n\t// @if CK_DEBUG_ENGINE // \tconsole.log( 'ViewText: ' + this );\n\t// @if CK_DEBUG_ENGINE // }\n}\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module engine/view/textproxy\n */\n\nimport CKEditorError from '@ckeditor/ckeditor5-utils/src/ckeditorerror';\n\n/**\n * TextProxy is a wrapper for substring of {@link module:engine/view/text~Text}. Instance of this class is created by\n * {@link module:engine/view/treewalker~TreeWalker} when only a part of {@link module:engine/view/text~Text} needs to be returned.\n *\n * `TextProxy` has an API similar to {@link module:engine/view/text~Text Text} and allows to do most of the common tasks performed\n * on view nodes.\n *\n * **Note:** Some `TextProxy` instances may represent whole text node, not just a part of it.\n * See {@link module:engine/view/textproxy~TextProxy#isPartial}.\n *\n * **Note:** `TextProxy` is a readonly interface.\n *\n * **Note:** `TextProxy` instances are created on the fly basing on the current state of parent {@link module:engine/view/text~Text}.\n * Because of this it is highly unrecommended to store references to `TextProxy instances because they might get\n * invalidated due to operations on Document. Also TextProxy is not a {@link module:engine/view/node~Node} so it can not be\n * inserted as a child of {@link module:engine/view/element~Element}.\n *\n * `TextProxy` instances are created by {@link module:engine/view/treewalker~TreeWalker view tree walker}. You should not need to create\n * an instance of this class by your own.\n */\nexport default class TextProxy {\n\t/**\n\t * Creates a text proxy.\n\t *\n\t * @protected\n\t * @param {module:engine/view/text~Text} textNode Text node which part is represented by this text proxy.\n\t * @param {Number} offsetInText Offset in {@link module:engine/view/textproxy~TextProxy#textNode text node}\n\t * from which the text proxy starts.\n\t * @param {Number} length Text proxy length, that is how many text node's characters, starting from `offsetInText` it represents.\n\t * @constructor\n\t */\n\tconstructor( textNode, offsetInText, length ) {\n\t\t/**\n\t\t * Reference to the {@link module:engine/view/text~Text} element which TextProxy is a substring.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:engine/view/text~Text} module:engine/view/textproxy~TextProxy#textNode\n\t\t */\n\t\tthis.textNode = textNode;\n\n\t\tif ( offsetInText < 0 || offsetInText > textNode.data.length ) {\n\t\t\t/**\n\t\t\t * Given offsetInText value is incorrect.\n\t\t\t *\n\t\t\t * @error view-textproxy-wrong-offsetintext\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'view-textproxy-wrong-offsetintext', this );\n\t\t}\n\n\t\tif ( length < 0 || offsetInText + length > textNode.data.length ) {\n\t\t\t/**\n\t\t\t * Given length value is incorrect.\n\t\t\t *\n\t\t\t * @error view-textproxy-wrong-length\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'view-textproxy-wrong-length', this );\n\t\t}\n\n\t\t/**\n\t\t * Text data represented by this text proxy.\n\t\t *\n\t\t * @readonly\n\t\t * @member {String} module:engine/view/textproxy~TextProxy#data\n\t\t */\n\t\tthis.data = textNode.data.substring( offsetInText, offsetInText + length );\n\n\t\t/**\n\t\t * Offset in the `textNode` where this `TextProxy` instance starts.\n\t\t *\n\t\t * @readonly\n\t\t * @member {Number} module:engine/view/textproxy~TextProxy#offsetInText\n\t\t */\n\t\tthis.offsetInText = offsetInText;\n\t}\n\n\t/**\n\t * Offset size of this node.\n\t *\n\t * @readonly\n\t * @type {Number}\n\t */\n\tget offsetSize() {\n\t\treturn this.data.length;\n\t}\n\n\t/**\n\t * Flag indicating whether `TextProxy` instance covers only part of the original {@link module:engine/view/text~Text text node}\n\t * (`true`) or the whole text node (`false`).\n\t *\n\t * This is `false` when text proxy starts at the very beginning of {@link module:engine/view/textproxy~TextProxy#textNode textNode}\n\t * ({@link module:engine/view/textproxy~TextProxy#offsetInText offsetInText} equals `0`) and text proxy sizes is equal to\n\t * text node size.\n\t *\n\t * @readonly\n\t * @type {Boolean}\n\t */\n\tget isPartial() {\n\t\treturn this.data.length !== this.textNode.data.length;\n\t}\n\n\t/**\n\t * Parent of this text proxy, which is same as parent of text node represented by this text proxy.\n\t *\n\t * @readonly\n\t * @type {module:engine/view/element~Element|module:engine/view/documentfragment~DocumentFragment|null}\n\t */\n\tget parent() {\n\t\treturn this.textNode.parent;\n\t}\n\n\t/**\n\t * Root of this text proxy, which is same as root of text node represented by this text proxy.\n\t *\n\t * @readonly\n\t * @type {module:engine/view/node~Node|module:engine/view/documentfragment~DocumentFragment}\n\t */\n\tget root() {\n\t\treturn this.textNode.root;\n\t}\n\n\t/**\n\t * {@link module:engine/view/document~Document View document} that owns this text proxy, or `null` if the text proxy is inside\n\t * {@link module:engine/view/documentfragment~DocumentFragment document fragment}.\n\t *\n\t * @readonly\n\t * @type {module:engine/view/document~Document|null}\n\t */\n\tget document() {\n\t\treturn this.textNode.document;\n\t}\n\n\t/**\n\t * Checks whether this object is of the given type.\n\t *\n\t *\t\ttextProxy.is( '$textProxy' ); // -> true\n\t *\t\ttextProxy.is( 'view:$textProxy' ); // -> true\n\t *\n\t *\t\ttextProxy.is( 'model:$textProxy' ); // -> false\n\t *\t\ttextProxy.is( 'element' ); // -> false\n\t *\t\ttextProxy.is( 'range' ); // -> false\n\t *\n\t * {@link module:engine/view/node~Node#is Check the entire list of view objects} which implement the `is()` method.\n\t *\n\t * **Note:** Until version 20.0.0 this method wasn't accepting `'$textProxy'` type. The legacy `'textProxy'` type is still\n\t * accepted for backward compatibility.\n\t *\n\t * @param {String} type Type to check.\n\t * @returns {Boolean}\n\t */\n\tis( type ) {\n\t\treturn type === '$textProxy' || type === 'view:$textProxy' ||\n\t\t\t// This are legacy values kept for backward compatibility.\n\t\t\ttype === 'textProxy' || type === 'view:textProxy';\n\t}\n\n\t/**\n\t * Returns ancestors array of this text proxy.\n\t *\n\t * @param {Object} options Options object.\n\t * @param {Boolean} [options.includeSelf=false] When set to `true` {#textNode} will be also included in parent's array.\n\t * @param {Boolean} [options.parentFirst=false] When set to `true`, array will be sorted from text proxy parent to\n\t * root element, otherwise root element will be the first item in the array.\n\t * @returns {Array} Array with ancestors.\n\t */\n\tgetAncestors( options = { includeSelf: false, parentFirst: false } ) {\n\t\tconst ancestors = [];\n\t\tlet parent = options.includeSelf ? this.textNode : this.parent;\n\n\t\twhile ( parent !== null ) {\n\t\t\tancestors[ options.parentFirst ? 'push' : 'unshift' ]( parent );\n\t\t\tparent = parent.parent;\n\t\t}\n\n\t\treturn ancestors;\n\t}\n\n\t// @if CK_DEBUG_ENGINE // toString() {\n\t// @if CK_DEBUG_ENGINE // \treturn `#${ this.data }`;\n\t// @if CK_DEBUG_ENGINE // }\n\n\t// @if CK_DEBUG_ENGINE // log() {\n\t// @if CK_DEBUG_ENGINE // \tconsole.log( 'ViewTextProxy: ' + this );\n\t// @if CK_DEBUG_ENGINE // }\n\n\t// @if CK_DEBUG_ENGINE // logExtended() {\n\t// @if CK_DEBUG_ENGINE // \tconsole.log( 'ViewTextProxy: ' + this );\n\t// @if CK_DEBUG_ENGINE // }\n}\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module utils/tomap\n */\n\nimport objectToMap from './objecttomap';\nimport isIterable from './isiterable';\n\n/**\n * Transforms object or iterable to map. Iterable needs to be in the format acceptable by the `Map` constructor.\n *\n *\t\tmap = toMap( { 'foo': 1, 'bar': 2 } );\n *\t\tmap = toMap( [ [ 'foo', 1 ], [ 'bar', 2 ] ] );\n *\t\tmap = toMap( anotherMap );\n *\n * @param {Object|Iterable} data Object or iterable to transform.\n * @returns {Map} Map created from data.\n */\nexport default function toMap( data ) {\n\tif ( isIterable( data ) ) {\n\t\treturn new Map( data );\n\t} else {\n\t\treturn objectToMap( data );\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module utils/objecttomap\n */\n\n/**\n * Transforms object to map.\n *\n *\t\tconst map = objectToMap( { 'foo': 1, 'bar': 2 } );\n *\t\tmap.get( 'foo' ); // 1\n *\n * **Note**: For mixed data (`Object` or `Iterable`) there's a dedicated {@link module:utils/tomap~toMap} function.\n *\n * @param {Object} obj Object to transform.\n * @returns {Map} Map created from object.\n */\nexport default function objectToMap( obj ) {\n\tconst map = new Map();\n\n\tfor ( const key in obj ) {\n\t\tmap.set( key, obj[ key ] );\n\t}\n\n\treturn map;\n}\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module engine/view/matcher\n */\n\n/**\n * View matcher class.\n * Instance of this class can be used to find {@link module:engine/view/element~Element elements} that match given pattern.\n */\nexport default class Matcher {\n\t/**\n\t * Creates new instance of Matcher.\n\t *\n\t * @param {String|RegExp|Object} [pattern] Match patterns. See {@link module:engine/view/matcher~Matcher#add add method} for\n\t * more information.\n\t */\n\tconstructor( ...pattern ) {\n\t\t/**\n\t\t * @private\n\t\t * @type {Array<String|RegExp|Object>}\n\t\t */\n\t\tthis._patterns = [];\n\n\t\tthis.add( ...pattern );\n\t}\n\n\t/**\n\t * Adds pattern or patterns to matcher instance.\n\t *\n\t *\t\t// String.\n\t *\t\tmatcher.add( 'div' );\n\t *\n\t *\t\t// Regular expression.\n\t *\t\tmatcher.add( /^\\w/ );\n\t *\n\t *\t\t// Single class.\n\t *\t\tmatcher.add( {\n\t *\t\t\tclasses: 'foobar'\n\t *\t\t} );\n\t *\n\t * See {@link module:engine/view/matcher~MatcherPattern} for more examples.\n\t *\n\t * Multiple patterns can be added in one call:\n\t *\n\t * \t\tmatcher.add( 'div', { classes: 'foobar' } );\n\t *\n\t * @param {Object|String|RegExp|Function} pattern Object describing pattern details. If string or regular expression\n\t * is provided it will be used to match element's name. Pattern can be also provided in a form\n\t * of a function - then this function will be called with each {@link module:engine/view/element~Element element} as a parameter.\n\t * Function's return value will be stored under `match` key of the object returned from\n\t * {@link module:engine/view/matcher~Matcher#match match} or {@link module:engine/view/matcher~Matcher#matchAll matchAll} methods.\n\t * @param {String|RegExp} [pattern.name] Name or regular expression to match element's name.\n\t * @param {Object} [pattern.attributes] Object with key-value pairs representing attributes to match. Each object key\n\t * represents attribute name. Value under that key can be either:\n\t * * `true` - then attribute is just required (can be empty),\n\t * * a string - then attribute has to be equal, or\n\t * * a regular expression - then attribute has to match the expression.\n\t * @param {String|RegExp|Array} [pattern.classes] Class name or array of class names to match. Each name can be\n\t * provided in a form of string or regular expression.\n\t * @param {Object} [pattern.styles] Object with key-value pairs representing styles to match. Each object key\n\t * represents style name. Value under that key can be either a string or a regular expression and it will be used\n\t * to match style value.\n\t */\n\tadd( ...pattern ) {\n\t\tfor ( let item of pattern ) {\n\t\t\t// String or RegExp pattern is used as element's name.\n\t\t\tif ( typeof item == 'string' || item instanceof RegExp ) {\n\t\t\t\titem = { name: item };\n\t\t\t}\n\n\t\t\t// Single class name/RegExp can be provided.\n\t\t\tif ( item.classes && ( typeof item.classes == 'string' || item.classes instanceof RegExp ) ) {\n\t\t\t\titem.classes = [ item.classes ];\n\t\t\t}\n\n\t\t\tthis._patterns.push( item );\n\t\t}\n\t}\n\n\t/**\n\t * Matches elements for currently stored patterns. Returns match information about first found\n\t * {@link module:engine/view/element~Element element}, otherwise returns `null`.\n\t *\n\t * Example of returned object:\n\t *\n\t *\t\t{\n\t *\t\t\telement: <instance of found element>,\n\t *\t\t\tpattern: <pattern used to match found element>,\n\t *\t\t\tmatch: {\n\t *\t\t\t\tname: true,\n\t *\t\t\t\tattributes: [ 'title', 'href' ],\n\t *\t\t\t\tclasses: [ 'foo' ],\n\t *\t\t\t\tstyles: [ 'color', 'position' ]\n\t *\t\t\t}\n\t *\t\t}\n\t *\n\t * @see module:engine/view/matcher~Matcher#add\n\t * @see module:engine/view/matcher~Matcher#matchAll\n\t * @param {...module:engine/view/element~Element} element View element to match against stored patterns.\n\t * @returns {Object|null} result\n\t * @returns {module:engine/view/element~Element} result.element Matched view element.\n\t * @returns {Object|String|RegExp|Function} result.pattern Pattern that was used to find matched element.\n\t * @returns {Object} result.match Object representing matched element parts.\n\t * @returns {Boolean} [result.match.name] True if name of the element was matched.\n\t * @returns {Array} [result.match.attributes] Array with matched attribute names.\n\t * @returns {Array} [result.match.classes] Array with matched class names.\n\t * @returns {Array} [result.match.styles] Array with matched style names.\n\t */\n\tmatch( ...element ) {\n\t\tfor ( const singleElement of element ) {\n\t\t\tfor ( const pattern of this._patterns ) {\n\t\t\t\tconst match = isElementMatching( singleElement, pattern );\n\n\t\t\t\tif ( match ) {\n\t\t\t\t\treturn {\n\t\t\t\t\t\telement: singleElement,\n\t\t\t\t\t\tpattern,\n\t\t\t\t\t\tmatch\n\t\t\t\t\t};\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\n\t\treturn null;\n\t}\n\n\t/**\n\t * Matches elements for currently stored patterns. Returns array of match information with all found\n\t * {@link module:engine/view/element~Element elements}. If no element is found - returns `null`.\n\t *\n\t * @see module:engine/view/matcher~Matcher#add\n\t * @see module:engine/view/matcher~Matcher#match\n\t * @param {...module:engine/view/element~Element} element View element to match against stored patterns.\n\t * @returns {Array.<Object>|null} Array with match information about found elements or `null`. For more information\n\t * see {@link module:engine/view/matcher~Matcher#match match method} description.\n\t */\n\tmatchAll( ...element ) {\n\t\tconst results = [];\n\n\t\tfor ( const singleElement of element ) {\n\t\t\tfor ( const pattern of this._patterns ) {\n\t\t\t\tconst match = isElementMatching( singleElement, pattern );\n\n\t\t\t\tif ( match ) {\n\t\t\t\t\tresults.push( {\n\t\t\t\t\t\telement: singleElement,\n\t\t\t\t\t\tpattern,\n\t\t\t\t\t\tmatch\n\t\t\t\t\t} );\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\n\t\treturn results.length > 0 ? results : null;\n\t}\n\n\t/**\n\t * Returns the name of the element to match if there is exactly one pattern added to the matcher instance\n\t * and it matches element name defined by `string` (not `RegExp`). Otherwise, returns `null`.\n\t *\n\t * @returns {String|null} Element name trying to match.\n\t */\n\tgetElementName() {\n\t\tif ( this._patterns.length !== 1 ) {\n\t\t\treturn null;\n\t\t}\n\n\t\tconst pattern = this._patterns[ 0 ];\n\t\tconst name = pattern.name;\n\n\t\treturn ( typeof pattern != 'function' && name && !( name instanceof RegExp ) ) ? name : null;\n\t}\n}\n\n// Returns match information if {@link module:engine/view/element~Element element} is matching provided pattern.\n// If element cannot be matched to provided pattern - returns `null`.\n//\n// @param {module:engine/view/element~Element} element\n// @param {Object|String|RegExp|Function} pattern\n// @returns {Object|null} Returns object with match information or null if element is not matching.\nfunction isElementMatching( element, pattern ) {\n\t// If pattern is provided as function - return result of that function;\n\tif ( typeof pattern == 'function' ) {\n\t\treturn pattern( element );\n\t}\n\n\tconst match = {};\n\t// Check element's name.\n\tif ( pattern.name ) {\n\t\tmatch.name = matchName( pattern.name, element.name );\n\n\t\tif ( !match.name ) {\n\t\t\treturn null;\n\t\t}\n\t}\n\n\t// Check element's attributes.\n\tif ( pattern.attributes ) {\n\t\tmatch.attributes = matchAttributes( pattern.attributes, element );\n\n\t\tif ( !match.attributes ) {\n\t\t\treturn null;\n\t\t}\n\t}\n\n\t// Check element's classes.\n\tif ( pattern.classes ) {\n\t\tmatch.classes = matchClasses( pattern.classes, element );\n\n\t\tif ( !match.classes ) {\n\t\t\treturn false;\n\t\t}\n\t}\n\n\t// Check element's styles.\n\tif ( pattern.styles ) {\n\t\tmatch.styles = matchStyles( pattern.styles, element );\n\n\t\tif ( !match.styles ) {\n\t\t\treturn false;\n\t\t}\n\t}\n\n\treturn match;\n}\n\n// Checks if name can be matched by provided pattern.\n//\n// @param {String|RegExp} pattern\n// @param {String} name\n// @returns {Boolean} Returns `true` if name can be matched, `false` otherwise.\nfunction matchName( pattern, name ) {\n\t// If pattern is provided as RegExp - test against this regexp.\n\tif ( pattern instanceof RegExp ) {\n\t\treturn pattern.test( name );\n\t}\n\n\treturn pattern === name;\n}\n\n// Checks if attributes of provided element can be matched against provided patterns.\n//\n// @param {Object} patterns Object with information about attributes to match. Each key of the object will be\n// used as attribute name. Value of each key can be a string or regular expression to match against attribute value.\n// @param {module:engine/view/element~Element} element Element which attributes will be tested.\n// @returns {Array|null} Returns array with matched attribute names or `null` if no attributes were matched.\nfunction matchAttributes( patterns, element ) {\n\tconst match = [];\n\n\tfor ( const name in patterns ) {\n\t\tconst pattern = patterns[ name ];\n\n\t\tif ( element.hasAttribute( name ) ) {\n\t\t\tconst attribute = element.getAttribute( name );\n\n\t\t\tif ( pattern === true ) {\n\t\t\t\tmatch.push( name );\n\t\t\t} else if ( pattern instanceof RegExp ) {\n\t\t\t\tif ( pattern.test( attribute ) ) {\n\t\t\t\t\tmatch.push( name );\n\t\t\t\t} else {\n\t\t\t\t\treturn null;\n\t\t\t\t}\n\t\t\t} else if ( attribute === pattern ) {\n\t\t\t\tmatch.push( name );\n\t\t\t} else {\n\t\t\t\treturn null;\n\t\t\t}\n\t\t} else {\n\t\t\treturn null;\n\t\t}\n\t}\n\n\treturn match;\n}\n\n// Checks if classes of provided element can be matched against provided patterns.\n//\n// @param {Array.<String|RegExp>} patterns Array of strings or regular expressions to match against element's classes.\n// @param {module:engine/view/element~Element} element Element which classes will be tested.\n// @returns {Array|null} Returns array with matched class names or `null` if no classes were matched.\nfunction matchClasses( patterns, element ) {\n\tconst match = [];\n\n\tfor ( const pattern of patterns ) {\n\t\tif ( pattern instanceof RegExp ) {\n\t\t\tconst classes = element.getClassNames();\n\n\t\t\tfor ( const name of classes ) {\n\t\t\t\tif ( pattern.test( name ) ) {\n\t\t\t\t\tmatch.push( name );\n\t\t\t\t}\n\t\t\t}\n\n\t\t\tif ( match.length === 0 ) {\n\t\t\t\treturn null;\n\t\t\t}\n\t\t} else if ( element.hasClass( pattern ) ) {\n\t\t\tmatch.push( pattern );\n\t\t} else {\n\t\t\treturn null;\n\t\t}\n\t}\n\n\treturn match;\n}\n\n// Checks if styles of provided element can be matched against provided patterns.\n//\n// @param {Object} patterns Object with information about styles to match. Each key of the object will be\n// used as style name. Value of each key can be a string or regular expression to match against style value.\n// @param {module:engine/view/element~Element} element Element which styles will be tested.\n// @returns {Array|null} Returns array with matched style names or `null` if no styles were matched.\nfunction matchStyles( patterns, element ) {\n\tconst match = [];\n\n\tfor ( const name in patterns ) {\n\t\tconst pattern = patterns[ name ];\n\n\t\tif ( element.hasStyle( name ) ) {\n\t\t\tconst style = element.getStyle( name );\n\n\t\t\tif ( pattern instanceof RegExp ) {\n\t\t\t\tif ( pattern.test( style ) ) {\n\t\t\t\t\tmatch.push( name );\n\t\t\t\t} else {\n\t\t\t\t\treturn null;\n\t\t\t\t}\n\t\t\t} else if ( style === pattern ) {\n\t\t\t\tmatch.push( name );\n\t\t\t} else {\n\t\t\t\treturn null;\n\t\t\t}\n\t\t} else {\n\t\t\treturn null;\n\t\t}\n\t}\n\n\treturn match;\n}\n\n/**\n * An entity that is a valid pattern recognized by a matcher. `MatcherPattern` is used by {@link ~Matcher} to recognize\n * if a view element fits in a group of view elements described by the pattern.\n *\n * `MatcherPattern` can be given as a `String`, a `RegExp`, an `Object` or a `Function`.\n *\n * If `MatcherPattern` is given as a `String` or `RegExp`, it will match any view element that has a matching name:\n *\n *\t\t// Match any element with name equal to 'div'.\n *\t\tconst pattern = 'div';\n *\n *\t\t// Match any element which name starts on 'p'.\n *\t\tconst pattern = /^p/;\n *\n * If `MatcherPattern` is given as an `Object`, all the object's properties will be matched with view element properties.\n *\n *\t\t// Match view element's name.\n *\t\tconst pattern = { name: /^p/ };\n *\n *\t\t// Match view element which has matching attributes.\n *\t\tconst pattern = {\n *\t\t\tattributes: {\n *\t\t\t\ttitle: 'foobar',\t// Attribute title should equal 'foobar'.\n *\t\t\t\tfoo: /^\\w+/,\t\t// Attribute foo should match /^\\w+/ regexp.\n *\t\t\t\tbar: true\t\t\t// Attribute bar should be set (can be empty).\n *\t\t\t}\n *\t\t};\n *\n *\t\t// Match view element which has given class.\n *\t\tconst pattern = {\n *\t\t\tclasses: 'foobar'\n *\t\t};\n *\n *\t\t// Match view element class using regular expression.\n *\t\tconst pattern = {\n *\t\t\tclasses: /foo.../\n *\t\t};\n *\n *\t\t// Multiple classes to match.\n *\t\tconst pattern = {\n *\t\t\tclasses: [ 'baz', 'bar', /foo.../ ]\n *\t\t};\n *\n *\t\t// Match view element which has given styles.\n *\t\tconst pattern = {\n *\t\t\tstyles: {\n *\t\t\t\tposition: 'absolute',\n *\t\t\t\tcolor: /^\\w*blue$/\n *\t\t\t}\n *\t\t};\n *\n *\t\t// Pattern with multiple properties.\n *\t\tconst pattern = {\n *\t\t\tname: 'span',\n *\t\t\tstyles: {\n *\t\t\t\t'font-weight': 'bold'\n *\t\t\t},\n *\t\t\tclasses: 'highlighted'\n *\t\t};\n *\n * If `MatcherPattern` is given as a `Function`, the function takes a view element as a first and only parameter and\n * the function should decide whether that element matches. If so, it should return what part of the view element has been matched.\n * Otherwise, the function should return `null`. The returned result will be included in `match` property of the object\n * returned by {@link ~Matcher#match} call.\n *\n *\t\t// Match an empty <div> element.\n *\t\tconst pattern = element => {\n *\t\t\tif ( element.name == 'div' && element.childCount > 0 ) {\n *\t\t\t\t// Return which part of the element was matched.\n *\t\t\t\treturn { name: true };\n *\t\t\t}\n *\n *\t\t\treturn null;\n *\t\t};\n *\n *\t\t// Match a <p> element with big font (\"heading-like\" element).\n *\t\tconst pattern = element => {\n *\t\t\tif ( element.name == 'p' ) {\n *\t\t\t\tconst fontSize = element.getStyle( 'font-size' );\n *\t\t\t\tconst size = fontSize.match( /(\\d+)/px );\n *\n *\t\t\t\tif ( size && Number( size[ 1 ] ) > 26 ) {\n *\t\t\t\t\treturn { name: true, attribute: [ 'font-size' ] };\n *\t\t\t\t}\n *\t\t\t}\n *\n *\t\t\treturn null;\n *\t\t};\n *\n * `MatcherPattern` is defined in a way that it is a superset of {@link module:engine/view/elementdefinition~ElementDefinition},\n * that is, every `ElementDefinition` also can be used as a `MatcherPattern`.\n *\n * @typedef {String|RegExp|Object|Function} module:engine/view/matcher~MatcherPattern\n *\n * @property {String|RegExp} [name] View element name to match.\n * @property {String|RegExp|Array.<String|RegExp>} [classes] View element's class name(s) to match.\n * @property {Object} [styles] Object with key-value pairs representing styles to match.\n * Each object key represents style name. Value can be given as `String` or `RegExp`.\n * @property {Object} [attributes] Object with key-value pairs representing attributes to match.\n * Each object key represents attribute name. Value can be given as `String` or `RegExp`.\n */\n","import baseGetTag from './_baseGetTag.js';\nimport isObjectLike from './isObjectLike.js';\n\n/** `Object#toString` result references. */\nvar symbolTag = '[object Symbol]';\n\n/**\n * Checks if `value` is classified as a `Symbol` primitive or object.\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category Lang\n * @param {*} value The value to check.\n * @returns {boolean} Returns `true` if `value` is a symbol, else `false`.\n * @example\n *\n * _.isSymbol(Symbol.iterator);\n * // => true\n *\n * _.isSymbol('abc');\n * // => false\n */\nfunction isSymbol(value) {\n  return typeof value == 'symbol' ||\n    (isObjectLike(value) && baseGetTag(value) == symbolTag);\n}\n\nexport default isSymbol;\n","import isArray from './isArray.js';\nimport isSymbol from './isSymbol.js';\n\n/** Used to match property names within property paths. */\nvar reIsDeepProp = /\\.|\\[(?:[^[\\]]*|([\"'])(?:(?!\\1)[^\\\\]|\\\\.)*?\\1)\\]/,\n    reIsPlainProp = /^\\w*$/;\n\n/**\n * Checks if `value` is a property name and not a property path.\n *\n * @private\n * @param {*} value The value to check.\n * @param {Object} [object] The object to query keys on.\n * @returns {boolean} Returns `true` if `value` is a property name, else `false`.\n */\nfunction isKey(value, object) {\n  if (isArray(value)) {\n    return false;\n  }\n  var type = typeof value;\n  if (type == 'number' || type == 'symbol' || type == 'boolean' ||\n      value == null || isSymbol(value)) {\n    return true;\n  }\n  return reIsPlainProp.test(value) || !reIsDeepProp.test(value) ||\n    (object != null && value in Object(object));\n}\n\nexport default isKey;\n","import MapCache from './_MapCache.js';\n\n/** Error message constants. */\nvar FUNC_ERROR_TEXT = 'Expected a function';\n\n/**\n * Creates a function that memoizes the result of `func`. If `resolver` is\n * provided, it determines the cache key for storing the result based on the\n * arguments provided to the memoized function. By default, the first argument\n * provided to the memoized function is used as the map cache key. The `func`\n * is invoked with the `this` binding of the memoized function.\n *\n * **Note:** The cache is exposed as the `cache` property on the memoized\n * function. Its creation may be customized by replacing the `_.memoize.Cache`\n * constructor with one whose instances implement the\n * [`Map`](http://ecma-international.org/ecma-262/7.0/#sec-properties-of-the-map-prototype-object)\n * method interface of `clear`, `delete`, `get`, `has`, and `set`.\n *\n * @static\n * @memberOf _\n * @since 0.1.0\n * @category Function\n * @param {Function} func The function to have its output memoized.\n * @param {Function} [resolver] The function to resolve the cache key.\n * @returns {Function} Returns the new memoized function.\n * @example\n *\n * var object = { 'a': 1, 'b': 2 };\n * var other = { 'c': 3, 'd': 4 };\n *\n * var values = _.memoize(_.values);\n * values(object);\n * // => [1, 2]\n *\n * values(other);\n * // => [3, 4]\n *\n * object.a = 2;\n * values(object);\n * // => [1, 2]\n *\n * // Modify the result cache.\n * values.cache.set(object, ['a', 'b']);\n * values(object);\n * // => ['a', 'b']\n *\n * // Replace `_.memoize.Cache`.\n * _.memoize.Cache = WeakMap;\n */\nfunction memoize(func, resolver) {\n  if (typeof func != 'function' || (resolver != null && typeof resolver != 'function')) {\n    throw new TypeError(FUNC_ERROR_TEXT);\n  }\n  var memoized = function() {\n    var args = arguments,\n        key = resolver ? resolver.apply(this, args) : args[0],\n        cache = memoized.cache;\n\n    if (cache.has(key)) {\n      return cache.get(key);\n    }\n    var result = func.apply(this, args);\n    memoized.cache = cache.set(key, result) || cache;\n    return result;\n  };\n  memoized.cache = new (memoize.Cache || MapCache);\n  return memoized;\n}\n\n// Expose `MapCache`.\nmemoize.Cache = MapCache;\n\nexport default memoize;\n","import memoize from './memoize.js';\n\n/** Used as the maximum memoize cache size. */\nvar MAX_MEMOIZE_SIZE = 500;\n\n/**\n * A specialized version of `_.memoize` which clears the memoized function's\n * cache when it exceeds `MAX_MEMOIZE_SIZE`.\n *\n * @private\n * @param {Function} func The function to have its output memoized.\n * @returns {Function} Returns the new memoized function.\n */\nfunction memoizeCapped(func) {\n  var result = memoize(func, function(key) {\n    if (cache.size === MAX_MEMOIZE_SIZE) {\n      cache.clear();\n    }\n    return key;\n  });\n\n  var cache = result.cache;\n  return result;\n}\n\nexport default memoizeCapped;\n","import memoizeCapped from './_memoizeCapped.js';\n\n/** Used to match property names within property paths. */\nvar rePropName = /[^.[\\]]+|\\[(?:(-?\\d+(?:\\.\\d+)?)|([\"'])((?:(?!\\2)[^\\\\]|\\\\.)*?)\\2)\\]|(?=(?:\\.|\\[\\])(?:\\.|\\[\\]|$))/g;\n\n/** Used to match backslashes in property paths. */\nvar reEscapeChar = /\\\\(\\\\)?/g;\n\n/**\n * Converts `string` to a property path array.\n *\n * @private\n * @param {string} string The string to convert.\n * @returns {Array} Returns the property path array.\n */\nvar stringToPath = memoizeCapped(function(string) {\n  var result = [];\n  if (string.charCodeAt(0) === 46 /* . */) {\n    result.push('');\n  }\n  string.replace(rePropName, function(match, number, quote, subString) {\n    result.push(quote ? subString.replace(reEscapeChar, '$1') : (number || match));\n  });\n  return result;\n});\n\nexport default stringToPath;\n","/**\n * A specialized version of `_.map` for arrays without support for iteratee\n * shorthands.\n *\n * @private\n * @param {Array} [array] The array to iterate over.\n * @param {Function} iteratee The function invoked per iteration.\n * @returns {Array} Returns the new mapped array.\n */\nfunction arrayMap(array, iteratee) {\n  var index = -1,\n      length = array == null ? 0 : array.length,\n      result = Array(length);\n\n  while (++index < length) {\n    result[index] = iteratee(array[index], index, array);\n  }\n  return result;\n}\n\nexport default arrayMap;\n","import Symbol from './_Symbol.js';\nimport arrayMap from './_arrayMap.js';\nimport isArray from './isArray.js';\nimport isSymbol from './isSymbol.js';\n\n/** Used as references for various `Number` constants. */\nvar INFINITY = 1 / 0;\n\n/** Used to convert symbols to primitives and strings. */\nvar symbolProto = Symbol ? Symbol.prototype : undefined,\n    symbolToString = symbolProto ? symbolProto.toString : undefined;\n\n/**\n * The base implementation of `_.toString` which doesn't convert nullish\n * values to empty strings.\n *\n * @private\n * @param {*} value The value to process.\n * @returns {string} Returns the string.\n */\nfunction baseToString(value) {\n  // Exit early for strings to avoid a performance hit in some environments.\n  if (typeof value == 'string') {\n    return value;\n  }\n  if (isArray(value)) {\n    // Recursively convert values (susceptible to call stack limits).\n    return arrayMap(value, baseToString) + '';\n  }\n  if (isSymbol(value)) {\n    return symbolToString ? symbolToString.call(value) : '';\n  }\n  var result = (value + '');\n  return (result == '0' && (1 / value) == -INFINITY) ? '-0' : result;\n}\n\nexport default baseToString;\n","import baseToString from './_baseToString.js';\n\n/**\n * Converts `value` to a string. An empty string is returned for `null`\n * and `undefined` values. The sign of `-0` is preserved.\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category Lang\n * @param {*} value The value to convert.\n * @returns {string} Returns the converted string.\n * @example\n *\n * _.toString(null);\n * // => ''\n *\n * _.toString(-0);\n * // => '-0'\n *\n * _.toString([1, 2, 3]);\n * // => '1,2,3'\n */\nfunction toString(value) {\n  return value == null ? '' : baseToString(value);\n}\n\nexport default toString;\n","import isArray from './isArray.js';\nimport isKey from './_isKey.js';\nimport stringToPath from './_stringToPath.js';\nimport toString from './toString.js';\n\n/**\n * Casts `value` to a path array if it's not one.\n *\n * @private\n * @param {*} value The value to inspect.\n * @param {Object} [object] The object to query keys on.\n * @returns {Array} Returns the cast property path array.\n */\nfunction castPath(value, object) {\n  if (isArray(value)) {\n    return value;\n  }\n  return isKey(value, object) ? [value] : stringToPath(toString(value));\n}\n\nexport default castPath;\n","/**\n * Gets the last element of `array`.\n *\n * @static\n * @memberOf _\n * @since 0.1.0\n * @category Array\n * @param {Array} array The array to query.\n * @returns {*} Returns the last element of `array`.\n * @example\n *\n * _.last([1, 2, 3]);\n * // => 3\n */\nfunction last(array) {\n  var length = array == null ? 0 : array.length;\n  return length ? array[length - 1] : undefined;\n}\n\nexport default last;\n","import isSymbol from './isSymbol.js';\n\n/** Used as references for various `Number` constants. */\nvar INFINITY = 1 / 0;\n\n/**\n * Converts `value` to a string key if it's not a string or symbol.\n *\n * @private\n * @param {*} value The value to inspect.\n * @returns {string|symbol} Returns the key.\n */\nfunction toKey(value) {\n  if (typeof value == 'string' || isSymbol(value)) {\n    return value;\n  }\n  var result = (value + '');\n  return (result == '0' && (1 / value) == -INFINITY) ? '-0' : result;\n}\n\nexport default toKey;\n","import castPath from './_castPath.js';\nimport toKey from './_toKey.js';\n\n/**\n * The base implementation of `_.get` without support for default values.\n *\n * @private\n * @param {Object} object The object to query.\n * @param {Array|string} path The path of the property to get.\n * @returns {*} Returns the resolved value.\n */\nfunction baseGet(object, path) {\n  path = castPath(path, object);\n\n  var index = 0,\n      length = path.length;\n\n  while (object != null && index < length) {\n    object = object[toKey(path[index++])];\n  }\n  return (index && index == length) ? object : undefined;\n}\n\nexport default baseGet;\n","/**\n * The base implementation of `_.slice` without an iteratee call guard.\n *\n * @private\n * @param {Array} array The array to slice.\n * @param {number} [start=0] The start position.\n * @param {number} [end=array.length] The end position.\n * @returns {Array} Returns the slice of `array`.\n */\nfunction baseSlice(array, start, end) {\n  var index = -1,\n      length = array.length;\n\n  if (start < 0) {\n    start = -start > length ? 0 : (length + start);\n  }\n  end = end > length ? length : end;\n  if (end < 0) {\n    end += length;\n  }\n  length = start > end ? 0 : ((end - start) >>> 0);\n  start >>>= 0;\n\n  var result = Array(length);\n  while (++index < length) {\n    result[index] = array[index + start];\n  }\n  return result;\n}\n\nexport default baseSlice;\n","import baseGet from './_baseGet.js';\nimport baseSlice from './_baseSlice.js';\n\n/**\n * Gets the parent value at `path` of `object`.\n *\n * @private\n * @param {Object} object The object to query.\n * @param {Array} path The path to get the parent value of.\n * @returns {*} Returns the parent value.\n */\nfunction parent(object, path) {\n  return path.length < 2 ? object : baseGet(object, baseSlice(path, 0, -1));\n}\n\nexport default parent;\n","import castPath from './_castPath.js';\nimport last from './last.js';\nimport parent from './_parent.js';\nimport toKey from './_toKey.js';\n\n/**\n * The base implementation of `_.unset`.\n *\n * @private\n * @param {Object} object The object to modify.\n * @param {Array|string} path The property path to unset.\n * @returns {boolean} Returns `true` if the property is deleted, else `false`.\n */\nfunction baseUnset(object, path) {\n  path = castPath(path, object);\n  object = parent(object, path);\n  return object == null || delete object[toKey(last(path))];\n}\n\nexport default baseUnset;\n","import baseUnset from './_baseUnset.js';\n\n/**\n * Removes the property at `path` of `object`.\n *\n * **Note:** This method mutates `object`.\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category Object\n * @param {Object} object The object to modify.\n * @param {Array|string} path The path of the property to unset.\n * @returns {boolean} Returns `true` if the property is deleted, else `false`.\n * @example\n *\n * var object = { 'a': [{ 'b': { 'c': 7 } }] };\n * _.unset(object, 'a[0].b.c');\n * // => true\n *\n * console.log(object);\n * // => { 'a': [{ 'b': {} }] };\n *\n * _.unset(object, ['a', '0', 'b', 'c']);\n * // => true\n *\n * console.log(object);\n * // => { 'a': [{ 'b': {} }] };\n */\nfunction unset(object, path) {\n  return object == null ? true : baseUnset(object, path);\n}\n\nexport default unset;\n","import baseGet from './_baseGet.js';\n\n/**\n * Gets the value at `path` of `object`. If the resolved value is\n * `undefined`, the `defaultValue` is returned in its place.\n *\n * @static\n * @memberOf _\n * @since 3.7.0\n * @category Object\n * @param {Object} object The object to query.\n * @param {Array|string} path The path of the property to get.\n * @param {*} [defaultValue] The value returned for `undefined` resolved values.\n * @returns {*} Returns the resolved value.\n * @example\n *\n * var object = { 'a': [{ 'b': { 'c': 3 } }] };\n *\n * _.get(object, 'a[0].b.c');\n * // => 3\n *\n * _.get(object, ['a', '0', 'b', 'c']);\n * // => 3\n *\n * _.get(object, 'a.b.c', 'default');\n * // => 'default'\n */\nfunction get(object, path, defaultValue) {\n  var result = object == null ? undefined : baseGet(object, path);\n  return result === undefined ? defaultValue : result;\n}\n\nexport default get;\n","import baseAssignValue from './_baseAssignValue.js';\nimport eq from './eq.js';\n\n/**\n * This function is like `assignValue` except that it doesn't assign\n * `undefined` values.\n *\n * @private\n * @param {Object} object The object to modify.\n * @param {string} key The key of the property to assign.\n * @param {*} value The value to assign.\n */\nfunction assignMergeValue(object, key, value) {\n  if ((value !== undefined && !eq(object[key], value)) ||\n      (value === undefined && !(key in object))) {\n    baseAssignValue(object, key, value);\n  }\n}\n\nexport default assignMergeValue;\n","/**\n * Creates a base function for methods like `_.forIn` and `_.forOwn`.\n *\n * @private\n * @param {boolean} [fromRight] Specify iterating from right to left.\n * @returns {Function} Returns the new base function.\n */\nfunction createBaseFor(fromRight) {\n  return function(object, iteratee, keysFunc) {\n    var index = -1,\n        iterable = Object(object),\n        props = keysFunc(object),\n        length = props.length;\n\n    while (length--) {\n      var key = props[fromRight ? length : ++index];\n      if (iteratee(iterable[key], key, iterable) === false) {\n        break;\n      }\n    }\n    return object;\n  };\n}\n\nexport default createBaseFor;\n","import createBaseFor from './_createBaseFor.js';\n\n/**\n * The base implementation of `baseForOwn` which iterates over `object`\n * properties returned by `keysFunc` and invokes `iteratee` for each property.\n * Iteratee functions may exit iteration early by explicitly returning `false`.\n *\n * @private\n * @param {Object} object The object to iterate over.\n * @param {Function} iteratee The function invoked per iteration.\n * @param {Function} keysFunc The function to get the keys of `object`.\n * @returns {Object} Returns `object`.\n */\nvar baseFor = createBaseFor();\n\nexport default baseFor;\n","import isArrayLike from './isArrayLike.js';\nimport isObjectLike from './isObjectLike.js';\n\n/**\n * This method is like `_.isArrayLike` except that it also checks if `value`\n * is an object.\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category Lang\n * @param {*} value The value to check.\n * @returns {boolean} Returns `true` if `value` is an array-like object,\n *  else `false`.\n * @example\n *\n * _.isArrayLikeObject([1, 2, 3]);\n * // => true\n *\n * _.isArrayLikeObject(document.body.children);\n * // => true\n *\n * _.isArrayLikeObject('abc');\n * // => false\n *\n * _.isArrayLikeObject(_.noop);\n * // => false\n */\nfunction isArrayLikeObject(value) {\n  return isObjectLike(value) && isArrayLike(value);\n}\n\nexport default isArrayLikeObject;\n","/**\n * Gets the value at `key`, unless `key` is \"__proto__\" or \"constructor\".\n *\n * @private\n * @param {Object} object The object to query.\n * @param {string} key The key of the property to get.\n * @returns {*} Returns the property value.\n */\nfunction safeGet(object, key) {\n  if (key === 'constructor' && typeof object[key] === 'function') {\n    return;\n  }\n\n  if (key == '__proto__') {\n    return;\n  }\n\n  return object[key];\n}\n\nexport default safeGet;\n","import copyObject from './_copyObject.js';\nimport keysIn from './keysIn.js';\n\n/**\n * Converts `value` to a plain object flattening inherited enumerable string\n * keyed properties of `value` to own properties of the plain object.\n *\n * @static\n * @memberOf _\n * @since 3.0.0\n * @category Lang\n * @param {*} value The value to convert.\n * @returns {Object} Returns the converted plain object.\n * @example\n *\n * function Foo() {\n *   this.b = 2;\n * }\n *\n * Foo.prototype.c = 3;\n *\n * _.assign({ 'a': 1 }, new Foo);\n * // => { 'a': 1, 'b': 2 }\n *\n * _.assign({ 'a': 1 }, _.toPlainObject(new Foo));\n * // => { 'a': 1, 'b': 2, 'c': 3 }\n */\nfunction toPlainObject(value) {\n  return copyObject(value, keysIn(value));\n}\n\nexport default toPlainObject;\n","import assignMergeValue from './_assignMergeValue.js';\nimport cloneBuffer from './_cloneBuffer.js';\nimport cloneTypedArray from './_cloneTypedArray.js';\nimport copyArray from './_copyArray.js';\nimport initCloneObject from './_initCloneObject.js';\nimport isArguments from './isArguments.js';\nimport isArray from './isArray.js';\nimport isArrayLikeObject from './isArrayLikeObject.js';\nimport isBuffer from './isBuffer.js';\nimport isFunction from './isFunction.js';\nimport isObject from './isObject.js';\nimport isPlainObject from './isPlainObject.js';\nimport isTypedArray from './isTypedArray.js';\nimport safeGet from './_safeGet.js';\nimport toPlainObject from './toPlainObject.js';\n\n/**\n * A specialized version of `baseMerge` for arrays and objects which performs\n * deep merges and tracks traversed objects enabling objects with circular\n * references to be merged.\n *\n * @private\n * @param {Object} object The destination object.\n * @param {Object} source The source object.\n * @param {string} key The key of the value to merge.\n * @param {number} srcIndex The index of `source`.\n * @param {Function} mergeFunc The function to merge values.\n * @param {Function} [customizer] The function to customize assigned values.\n * @param {Object} [stack] Tracks traversed source values and their merged\n *  counterparts.\n */\nfunction baseMergeDeep(object, source, key, srcIndex, mergeFunc, customizer, stack) {\n  var objValue = safeGet(object, key),\n      srcValue = safeGet(source, key),\n      stacked = stack.get(srcValue);\n\n  if (stacked) {\n    assignMergeValue(object, key, stacked);\n    return;\n  }\n  var newValue = customizer\n    ? customizer(objValue, srcValue, (key + ''), object, source, stack)\n    : undefined;\n\n  var isCommon = newValue === undefined;\n\n  if (isCommon) {\n    var isArr = isArray(srcValue),\n        isBuff = !isArr && isBuffer(srcValue),\n        isTyped = !isArr && !isBuff && isTypedArray(srcValue);\n\n    newValue = srcValue;\n    if (isArr || isBuff || isTyped) {\n      if (isArray(objValue)) {\n        newValue = objValue;\n      }\n      else if (isArrayLikeObject(objValue)) {\n        newValue = copyArray(objValue);\n      }\n      else if (isBuff) {\n        isCommon = false;\n        newValue = cloneBuffer(srcValue, true);\n      }\n      else if (isTyped) {\n        isCommon = false;\n        newValue = cloneTypedArray(srcValue, true);\n      }\n      else {\n        newValue = [];\n      }\n    }\n    else if (isPlainObject(srcValue) || isArguments(srcValue)) {\n      newValue = objValue;\n      if (isArguments(objValue)) {\n        newValue = toPlainObject(objValue);\n      }\n      else if (!isObject(objValue) || isFunction(objValue)) {\n        newValue = initCloneObject(srcValue);\n      }\n    }\n    else {\n      isCommon = false;\n    }\n  }\n  if (isCommon) {\n    // Recursively merge objects and arrays (susceptible to call stack limits).\n    stack.set(srcValue, newValue);\n    mergeFunc(newValue, srcValue, srcIndex, customizer, stack);\n    stack['delete'](srcValue);\n  }\n  assignMergeValue(object, key, newValue);\n}\n\nexport default baseMergeDeep;\n","import Stack from './_Stack.js';\nimport assignMergeValue from './_assignMergeValue.js';\nimport baseFor from './_baseFor.js';\nimport baseMergeDeep from './_baseMergeDeep.js';\nimport isObject from './isObject.js';\nimport keysIn from './keysIn.js';\nimport safeGet from './_safeGet.js';\n\n/**\n * The base implementation of `_.merge` without support for multiple sources.\n *\n * @private\n * @param {Object} object The destination object.\n * @param {Object} source The source object.\n * @param {number} srcIndex The index of `source`.\n * @param {Function} [customizer] The function to customize merged values.\n * @param {Object} [stack] Tracks traversed source values and their merged\n *  counterparts.\n */\nfunction baseMerge(object, source, srcIndex, customizer, stack) {\n  if (object === source) {\n    return;\n  }\n  baseFor(source, function(srcValue, key) {\n    stack || (stack = new Stack);\n    if (isObject(srcValue)) {\n      baseMergeDeep(object, source, key, srcIndex, baseMerge, customizer, stack);\n    }\n    else {\n      var newValue = customizer\n        ? customizer(safeGet(object, key), srcValue, (key + ''), object, source, stack)\n        : undefined;\n\n      if (newValue === undefined) {\n        newValue = srcValue;\n      }\n      assignMergeValue(object, key, newValue);\n    }\n  }, keysIn);\n}\n\nexport default baseMerge;\n","/**\n * This method returns the first argument it receives.\n *\n * @static\n * @since 0.1.0\n * @memberOf _\n * @category Util\n * @param {*} value Any value.\n * @returns {*} Returns `value`.\n * @example\n *\n * var object = { 'a': 1 };\n *\n * console.log(_.identity(object) === object);\n * // => true\n */\nfunction identity(value) {\n  return value;\n}\n\nexport default identity;\n","/**\n * A faster alternative to `Function#apply`, this function invokes `func`\n * with the `this` binding of `thisArg` and the arguments of `args`.\n *\n * @private\n * @param {Function} func The function to invoke.\n * @param {*} thisArg The `this` binding of `func`.\n * @param {Array} args The arguments to invoke `func` with.\n * @returns {*} Returns the result of `func`.\n */\nfunction apply(func, thisArg, args) {\n  switch (args.length) {\n    case 0: return func.call(thisArg);\n    case 1: return func.call(thisArg, args[0]);\n    case 2: return func.call(thisArg, args[0], args[1]);\n    case 3: return func.call(thisArg, args[0], args[1], args[2]);\n  }\n  return func.apply(thisArg, args);\n}\n\nexport default apply;\n","import apply from './_apply.js';\n\n/* Built-in method references for those with the same name as other `lodash` methods. */\nvar nativeMax = Math.max;\n\n/**\n * A specialized version of `baseRest` which transforms the rest array.\n *\n * @private\n * @param {Function} func The function to apply a rest parameter to.\n * @param {number} [start=func.length-1] The start position of the rest parameter.\n * @param {Function} transform The rest array transform.\n * @returns {Function} Returns the new function.\n */\nfunction overRest(func, start, transform) {\n  start = nativeMax(start === undefined ? (func.length - 1) : start, 0);\n  return function() {\n    var args = arguments,\n        index = -1,\n        length = nativeMax(args.length - start, 0),\n        array = Array(length);\n\n    while (++index < length) {\n      array[index] = args[start + index];\n    }\n    index = -1;\n    var otherArgs = Array(start + 1);\n    while (++index < start) {\n      otherArgs[index] = args[index];\n    }\n    otherArgs[start] = transform(array);\n    return apply(func, this, otherArgs);\n  };\n}\n\nexport default overRest;\n","/**\n * Creates a function that returns `value`.\n *\n * @static\n * @memberOf _\n * @since 2.4.0\n * @category Util\n * @param {*} value The value to return from the new function.\n * @returns {Function} Returns the new constant function.\n * @example\n *\n * var objects = _.times(2, _.constant({ 'a': 1 }));\n *\n * console.log(objects);\n * // => [{ 'a': 1 }, { 'a': 1 }]\n *\n * console.log(objects[0] === objects[1]);\n * // => true\n */\nfunction constant(value) {\n  return function() {\n    return value;\n  };\n}\n\nexport default constant;\n","import constant from './constant.js';\nimport defineProperty from './_defineProperty.js';\nimport identity from './identity.js';\n\n/**\n * The base implementation of `setToString` without support for hot loop shorting.\n *\n * @private\n * @param {Function} func The function to modify.\n * @param {Function} string The `toString` result.\n * @returns {Function} Returns `func`.\n */\nvar baseSetToString = !defineProperty ? identity : function(func, string) {\n  return defineProperty(func, 'toString', {\n    'configurable': true,\n    'enumerable': false,\n    'value': constant(string),\n    'writable': true\n  });\n};\n\nexport default baseSetToString;\n","/** Used to detect hot functions by number of calls within a span of milliseconds. */\nvar HOT_COUNT = 800,\n    HOT_SPAN = 16;\n\n/* Built-in method references for those with the same name as other `lodash` methods. */\nvar nativeNow = Date.now;\n\n/**\n * Creates a function that'll short out and invoke `identity` instead\n * of `func` when it's called `HOT_COUNT` or more times in `HOT_SPAN`\n * milliseconds.\n *\n * @private\n * @param {Function} func The function to restrict.\n * @returns {Function} Returns the new shortable function.\n */\nfunction shortOut(func) {\n  var count = 0,\n      lastCalled = 0;\n\n  return function() {\n    var stamp = nativeNow(),\n        remaining = HOT_SPAN - (stamp - lastCalled);\n\n    lastCalled = stamp;\n    if (remaining > 0) {\n      if (++count >= HOT_COUNT) {\n        return arguments[0];\n      }\n    } else {\n      count = 0;\n    }\n    return func.apply(undefined, arguments);\n  };\n}\n\nexport default shortOut;\n","import baseSetToString from './_baseSetToString.js';\nimport shortOut from './_shortOut.js';\n\n/**\n * Sets the `toString` method of `func` to return `string`.\n *\n * @private\n * @param {Function} func The function to modify.\n * @param {Function} string The `toString` result.\n * @returns {Function} Returns `func`.\n */\nvar setToString = shortOut(baseSetToString);\n\nexport default setToString;\n","import identity from './identity.js';\nimport overRest from './_overRest.js';\nimport setToString from './_setToString.js';\n\n/**\n * The base implementation of `_.rest` which doesn't validate or coerce arguments.\n *\n * @private\n * @param {Function} func The function to apply a rest parameter to.\n * @param {number} [start=func.length-1] The start position of the rest parameter.\n * @returns {Function} Returns the new function.\n */\nfunction baseRest(func, start) {\n  return setToString(overRest(func, start, identity), func + '');\n}\n\nexport default baseRest;\n","import eq from './eq.js';\nimport isArrayLike from './isArrayLike.js';\nimport isIndex from './_isIndex.js';\nimport isObject from './isObject.js';\n\n/**\n * Checks if the given arguments are from an iteratee call.\n *\n * @private\n * @param {*} value The potential iteratee value argument.\n * @param {*} index The potential iteratee index or key argument.\n * @param {*} object The potential iteratee object argument.\n * @returns {boolean} Returns `true` if the arguments are from an iteratee call,\n *  else `false`.\n */\nfunction isIterateeCall(value, index, object) {\n  if (!isObject(object)) {\n    return false;\n  }\n  var type = typeof index;\n  if (type == 'number'\n        ? (isArrayLike(object) && isIndex(index, object.length))\n        : (type == 'string' && index in object)\n      ) {\n    return eq(object[index], value);\n  }\n  return false;\n}\n\nexport default isIterateeCall;\n","import baseRest from './_baseRest.js';\nimport isIterateeCall from './_isIterateeCall.js';\n\n/**\n * Creates a function like `_.assign`.\n *\n * @private\n * @param {Function} assigner The function to assign values.\n * @returns {Function} Returns the new assigner function.\n */\nfunction createAssigner(assigner) {\n  return baseRest(function(object, sources) {\n    var index = -1,\n        length = sources.length,\n        customizer = length > 1 ? sources[length - 1] : undefined,\n        guard = length > 2 ? sources[2] : undefined;\n\n    customizer = (assigner.length > 3 && typeof customizer == 'function')\n      ? (length--, customizer)\n      : undefined;\n\n    if (guard && isIterateeCall(sources[0], sources[1], guard)) {\n      customizer = length < 3 ? undefined : customizer;\n      length = 1;\n    }\n    object = Object(object);\n    while (++index < length) {\n      var source = sources[index];\n      if (source) {\n        assigner(object, source, index, customizer);\n      }\n    }\n    return object;\n  });\n}\n\nexport default createAssigner;\n","import baseMerge from './_baseMerge.js';\nimport createAssigner from './_createAssigner.js';\n\n/**\n * This method is like `_.assign` except that it recursively merges own and\n * inherited enumerable string keyed properties of source objects into the\n * destination object. Source properties that resolve to `undefined` are\n * skipped if a destination value exists. Array and plain object properties\n * are merged recursively. Other objects and value types are overridden by\n * assignment. Source objects are applied from left to right. Subsequent\n * sources overwrite property assignments of previous sources.\n *\n * **Note:** This method mutates `object`.\n *\n * @static\n * @memberOf _\n * @since 0.5.0\n * @category Object\n * @param {Object} object The destination object.\n * @param {...Object} [sources] The source objects.\n * @returns {Object} Returns `object`.\n * @example\n *\n * var object = {\n *   'a': [{ 'b': 2 }, { 'd': 4 }]\n * };\n *\n * var other = {\n *   'a': [{ 'c': 3 }, { 'e': 5 }]\n * };\n *\n * _.merge(object, other);\n * // => { 'a': [{ 'b': 2, 'c': 3 }, { 'd': 4, 'e': 5 }] }\n */\nvar merge = createAssigner(function(object, source, srcIndex) {\n  baseMerge(object, source, srcIndex);\n});\n\nexport default merge;\n","import assignValue from './_assignValue.js';\nimport castPath from './_castPath.js';\nimport isIndex from './_isIndex.js';\nimport isObject from './isObject.js';\nimport toKey from './_toKey.js';\n\n/**\n * The base implementation of `_.set`.\n *\n * @private\n * @param {Object} object The object to modify.\n * @param {Array|string} path The path of the property to set.\n * @param {*} value The value to set.\n * @param {Function} [customizer] The function to customize path creation.\n * @returns {Object} Returns `object`.\n */\nfunction baseSet(object, path, value, customizer) {\n  if (!isObject(object)) {\n    return object;\n  }\n  path = castPath(path, object);\n\n  var index = -1,\n      length = path.length,\n      lastIndex = length - 1,\n      nested = object;\n\n  while (nested != null && ++index < length) {\n    var key = toKey(path[index]),\n        newValue = value;\n\n    if (key === '__proto__' || key === 'constructor' || key === 'prototype') {\n      return object;\n    }\n\n    if (index != lastIndex) {\n      var objValue = nested[key];\n      newValue = customizer ? customizer(objValue, key, nested) : undefined;\n      if (newValue === undefined) {\n        newValue = isObject(objValue)\n          ? objValue\n          : (isIndex(path[index + 1]) ? [] : {});\n      }\n    }\n    assignValue(nested, key, newValue);\n    nested = nested[key];\n  }\n  return object;\n}\n\nexport default baseSet;\n","import baseSet from './_baseSet.js';\n\n/**\n * Sets the value at `path` of `object`. If a portion of `path` doesn't exist,\n * it's created. Arrays are created for missing index properties while objects\n * are created for all other missing properties. Use `_.setWith` to customize\n * `path` creation.\n *\n * **Note:** This method mutates `object`.\n *\n * @static\n * @memberOf _\n * @since 3.7.0\n * @category Object\n * @param {Object} object The object to modify.\n * @param {Array|string} path The path of the property to set.\n * @param {*} value The value to set.\n * @returns {Object} Returns `object`.\n * @example\n *\n * var object = { 'a': [{ 'b': { 'c': 3 } }] };\n *\n * _.set(object, 'a[0].b.c', 4);\n * console.log(object.a[0].b.c);\n * // => 4\n *\n * _.set(object, ['x', '0', 'y', 'z'], 5);\n * console.log(object.x[0].y.z);\n * // => 5\n */\nfunction set(object, path, value) {\n  return object == null ? object : baseSet(object, path, value);\n}\n\nexport default set;\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module engine/view/stylesmap\n */\n\nimport { get, isObject, merge, set, unset } from 'lodash-es';\n\n/**\n * Styles map. Allows handling (adding, removing, retrieving) a set of style rules (usually, of an element).\n *\n * The styles map is capable of normalizing style names so e.g. the following operations are possible:\n */\nexport default class StylesMap {\n\t/**\n\t * Creates Styles instance.\n\t *\n\t * @param {module:engine/view/stylesmap~StylesProcessor} styleProcessor\n\t */\n\tconstructor( styleProcessor ) {\n\t\t/**\n\t\t * Keeps an internal representation of styles map. Normalized styles are kept as object tree to allow unified modification and\n\t\t * value access model using lodash's get, set, unset, etc methods.\n\t\t *\n\t\t * When no style processor rules are defined the it acts as simple key-value storage.\n\t\t *\n\t\t * @private\n\t\t * @type {Object}\n\t\t */\n\t\tthis._styles = {};\n\n\t\t/**\n\t\t * An instance of the {@link module:engine/view/stylesmap~StylesProcessor}.\n\t\t *\n\t\t * @private\n\t\t * @member {module:engine/view/stylesmap~StylesProcessor}\n\t\t */\n\t\tthis._styleProcessor = styleProcessor;\n\t}\n\n\t/**\n\t * Returns true if style map has no styles set.\n\t *\n\t * @returns {Boolean}\n\t */\n\tget isEmpty() {\n\t\tconst entries = Object.entries( this._styles );\n\t\tconst from = Array.from( entries );\n\n\t\treturn !from.length;\n\t}\n\n\t/**\n\t * Number of styles defined.\n\t *\n\t * @type {Number}\n\t */\n\tget size() {\n\t\tif ( this.isEmpty ) {\n\t\t\treturn 0;\n\t\t}\n\n\t\treturn this.getStyleNames().length;\n\t}\n\n\t/**\n\t * Set styles map to a new value.\n\t *\n\t *\t\tstyles.setTo( 'border:1px solid blue;margin-top:1px;' );\n\t *\n\t * @param {String} inlineStyle\n\t */\n\tsetTo( inlineStyle ) {\n\t\tthis.clear();\n\n\t\tconst parsedStyles = Array.from( parseInlineStyles( inlineStyle ).entries() );\n\n\t\tfor ( const [ key, value ] of parsedStyles ) {\n\t\t\tthis._styleProcessor.toNormalizedForm( key, value, this._styles );\n\t\t}\n\t}\n\n\t/**\n\t * Checks if a given style is set.\n\t *\n\t *\t\tstyles.setTo( 'margin-left:1px;' );\n\t *\n\t *\t\tstyles.has( 'margin-left' );    // -> true\n\t *\t\tstyles.has( 'padding' );        // -> false\n\t *\n\t * **Note**: This check supports normalized style names.\n\t *\n\t *\t\t// Enable 'margin' shorthand processing:\n\t *\t\teditor.data.addStyleProcessorRules( addMarginRules );\n\t *\n\t *\t\tstyles.setTo( 'margin:2px;' );\n\t *\n\t *\t\tstyles.has( 'margin' );         // -> true\n\t *\t\tstyles.has( 'margin-top' );     // -> true\n\t *\t\tstyles.has( 'margin-left' );    // -> true\n\t *\n\t *\t\tstyles.remove( 'margin-top' );\n\t *\n\t *\t\tstyles.has( 'margin' );         // -> false\n\t *\t\tstyles.has( 'margin-top' );     // -> false\n\t *\t\tstyles.has( 'margin-left' );    // -> true\n\t *\n\t * @param {String} name Style name.\n\t * @returns {Boolean}\n\t */\n\thas( name ) {\n\t\tif ( this.isEmpty ) {\n\t\t\treturn false;\n\t\t}\n\n\t\tconst styles = this._styleProcessor.getReducedForm( name, this._styles );\n\n\t\tconst propertyDescriptor = styles.find( ( [ property ] ) => property === name );\n\n\t\t// Only return a value if it is set;\n\t\treturn Array.isArray( propertyDescriptor );\n\t}\n\n\t/**\n\t * Sets a given style.\n\t *\n\t * Can insert one by one:\n\t *\n\t *\t\tstyles.set( 'color', 'blue' );\n\t *\t\tstyles.set( 'margin-right', '1em' );\n\t *\n\t * or many styles at once:\n\t *\n\t *\t\tstyles.set( {\n\t *\t\t\tcolor: 'blue',\n\t *\t\t\t'margin-right': '1em'\n\t *\t\t} );\n\t *\n\t * ***Note**:* This method uses {@link module:engine/controller/datacontroller~DataController#addStyleProcessorRules\n\t * enabled style processor rules} to normalize passed values.\n\t *\n\t *\t\t// Enable 'margin' shorthand processing:\n\t *\t\teditor.data.addStyleProcessorRules( addMarginRules );\n\t *\n\t *\t\tstyles.set( 'margin', '2px' );\n\t *\n\t * The above code will set margin to:\n\t *\n\t *\t\tstyles.getNormalized( 'margin' );\n\t *\t\t// -> { top: '2px', right: '2px', bottom: '2px', left: '2px' }\n\t *\n\t * Which makes it possible to retrieve a \"sub-value\":\n\t *\n\t *\t\tstyles.get( 'margin-left' );       // -> '2px'\n\t *\n\t * Or modify it:\n\t *\n\t *\t\tstyles.remove( 'margin-left' );\n\t *\n\t *\t\tstyles.getNormalized( 'margin' );  // -> { top: '1px', bottom: '1px', right: '1px' }\n\t *\t\tstyles.toString();                 // -> 'margin-bottom:1px;margin-right:1px;margin-top:1px;'\n\t *\n\t * This method also allows to set normalized values directly (if a particular styles processor rule was enabled):\n\t *\n\t *\t\tstyles.set( 'border-color', { top: 'blue' } );\n\t *\t\tstyles.set( 'margin', { right: '2em' } );\n\t *\n\t *\t\tstyles.toString();                 // -> 'border-color-top:blue;margin-right:2em;'\n\t *\n\t * @param {String|Object} nameOrObject Style property name or object with multiple properties.\n\t * @param {String|Object} valueOrObject Value to set.\n\t */\n\tset( nameOrObject, valueOrObject ) {\n\t\tif ( isObject( nameOrObject ) ) {\n\t\t\tfor ( const [ key, value ] of Object.entries( nameOrObject ) ) {\n\t\t\t\tthis._styleProcessor.toNormalizedForm( key, value, this._styles );\n\t\t\t}\n\t\t} else {\n\t\t\tthis._styleProcessor.toNormalizedForm( nameOrObject, valueOrObject, this._styles );\n\t\t}\n\t}\n\n\t/**\n\t * Removes given style.\n\t *\n\t *\t\tstyles.setTo( 'background:#f00;margin-right:2px;' );\n\t *\n\t *\t\tstyles.remove( 'background' );\n\t *\n\t *\t\tstyles.toString();   // -> 'margin-right:2px;'\n\t *\n\t * ***Note**:* This method uses {@link module:engine/controller/datacontroller~DataController#addStyleProcessorRules\n\t * enabled style processor rules} to normalize passed values.\n\t *\n\t *\t\t// Enable 'margin' shorthand processing:\n\t *\t\teditor.data.addStyleProcessorRules( addMarginRules );\n\t *\n\t *\t\tstyles.setTo( 'margin:1px' );\n\t *\n\t *\t\tstyles.remove( 'margin-top' );\n\t *\t\tstyles.remove( 'margin-right' );\n\t *\n\t *\t\tstyles.toString(); // -> 'margin-bottom:1px;margin-left:1px;'\n\t *\n\t * @param {String} name Style name.\n\t */\n\tremove( name ) {\n\t\tconst path = toPath( name );\n\n\t\tunset( this._styles, path );\n\t\tdelete this._styles[ name ];\n\n\t\tthis._cleanEmptyObjectsOnPath( path );\n\t}\n\n\t/**\n\t * Returns a normalized style object or a single value.\n\t *\n\t *\t\t// Enable 'margin' shorthand processing:\n\t *\t\teditor.data.addStyleProcessorRules( addMarginRules );\n\t *\n\t *\t\tconst styles = new Styles();\n\t *\t\tstyles.setTo( 'margin:1px 2px 3em;' );\n\t *\n\t *\t\tstyles.getNormalized( 'margin' );\n\t *\t\t// will log:\n\t *\t\t// {\n\t *\t\t//     top: '1px',\n\t *\t\t//     right: '2px',\n\t *\t\t//     bottom: '3em',\n\t *\t\t//     left: '2px'     // normalized value from margin shorthand\n\t *\t\t// }\n\t *\n\t *\t\tstyles.getNormalized( 'margin-left' ); // -> '2px'\n\t *\n\t * **Note**: This method will only return normalized styles if a style processor was defined.\n\t *\n\t * @param {String} name Style name.\n\t * @returns {Object|String|undefined}\n\t */\n\tgetNormalized( name ) {\n\t\treturn this._styleProcessor.getNormalized( name, this._styles );\n\t}\n\n\t/**\n\t * Returns a normalized style string. Styles are sorted by name.\n\t *\n\t *\t\tstyles.set( 'margin' , '1px' );\n\t *\t\tstyles.set( 'background', '#f00' );\n\t *\n\t *\t\tstyles.toString(); // -> 'background:#f00;margin:1px;'\n\t *\n\t * **Note**: This method supports normalized styles if defined.\n\t *\n\t *\t\t// Enable 'margin' shorthand processing:\n\t *\t\teditor.data.addStyleProcessorRules( addMarginRules );\n\t *\n\t *\t\tstyles.set( 'margin' , '1px' );\n\t *\t\tstyles.set( 'background', '#f00' );\n\t *\t\tstyles.remove( 'margin-top' );\n\t *\t\tstyles.remove( 'margin-right' );\n\t *\n\t *\t\tstyles.toString(); // -> 'background:#f00;margin-bottom:1px;margin-left:1px;'\n\t *\n\t * @returns {String}\n\t */\n\ttoString() {\n\t\tif ( this.isEmpty ) {\n\t\t\treturn '';\n\t\t}\n\n\t\treturn this._getStylesEntries()\n\t\t\t.map( arr => arr.join( ':' ) )\n\t\t\t.sort()\n\t\t\t.join( ';' ) + ';';\n\t}\n\n\t/**\n\t * Returns property as a value string or undefined if property is not set.\n\t *\n\t *\t\t// Enable 'margin' shorthand processing:\n\t *\t\teditor.data.addStyleProcessorRules( addMarginRules );\n\t *\n\t *\t\tconst styles = new Styles();\n\t *\t\tstyles.setTo( 'margin:1px;' );\n\t *\t\tstyles.set( 'margin-bottom', '3em' );\n\t *\n\t *\t\tstyles.getAsString( 'margin' ); // -> 'margin: 1px 1px 3em;'\n\t *\n\t * Note, however, that all sub-values must be set for the longhand property name to return a value:\n\t *\n\t *\t\tconst styles = new Styles();\n\t *\t\tstyles.setTo( 'margin:1px;' );\n\t *\t\tstyles.remove( 'margin-bottom' );\n\t *\n\t *\t\tstyles.getAsString( 'margin' ); // -> undefined\n\t *\n\t * In the above scenario, it is not possible to return a `margin` value, so `undefined` is returned.\n\t * Instead, you should use:\n\t *\n\t *\t\tconst styles = new Styles();\n\t *\t\tstyles.setTo( 'margin:1px;' );\n\t *\t\tstyles.remove( 'margin-bottom' );\n\t *\n\t *\t\tfor ( const styleName of styles.getStyleNames() ) {\n\t *\t\t\tconsole.log( styleName, styles.getAsString( styleName ) );\n\t *\t\t}\n\t *\t\t// 'margin-top', '1px'\n\t *\t\t// 'margin-right', '1px'\n\t *\t\t// 'margin-left', '1px'\n\t *\n\t * In general, it is recommend to iterate over style names like in the example above. This way, you will always get all\n\t * the currently set style values. So, if all the 4 margin values would be set\n\t * the for-of loop above would yield only `'margin'`, `'1px'`:\n\t *\n\t *\t\tconst styles = new Styles();\n\t *\t\tstyles.setTo( 'margin:1px;' );\n\t *\n\t *\t\tfor ( const styleName of styles.getStyleNames() ) {\n\t *\t\t\tconsole.log( styleName, styles.getAsString( styleName ) );\n\t *\t\t}\n\t *\t\t// 'margin', '1px'\n\t *\n\t * **Note**: To get a normalized version of a longhand property use the {@link #getNormalized `#getNormalized()`} method.\n\t *\n\t * @param {String} propertyName\n\t * @returns {String|undefined}\n\t */\n\tgetAsString( propertyName ) {\n\t\tif ( this.isEmpty ) {\n\t\t\treturn;\n\t\t}\n\n\t\tif ( this._styles[ propertyName ] && !isObject( this._styles[ propertyName ] ) ) {\n\t\t\t// Try return styles set directly - values that are not parsed.\n\t\t\treturn this._styles[ propertyName ];\n\t\t}\n\n\t\tconst styles = this._styleProcessor.getReducedForm( propertyName, this._styles );\n\n\t\tconst propertyDescriptor = styles.find( ( [ property ] ) => property === propertyName );\n\n\t\t// Only return a value if it is set;\n\t\tif ( Array.isArray( propertyDescriptor ) ) {\n\t\t\treturn propertyDescriptor[ 1 ];\n\t\t}\n\t}\n\n\t/**\n\t * Returns style property names as they would appear when using {@link #toString `#toString()`}.\n\t *\n\t * @returns {Array.<String>}\n\t */\n\tgetStyleNames() {\n\t\tif ( this.isEmpty ) {\n\t\t\treturn [];\n\t\t}\n\n\t\tconst entries = this._getStylesEntries();\n\n\t\treturn entries.map( ( [ key ] ) => key );\n\t}\n\n\t/**\n\t * Removes all styles.\n\t */\n\tclear() {\n\t\tthis._styles = {};\n\t}\n\n\t/**\n\t * Returns normalized styles entries for further processing.\n\t *\n\t * @private\n\t * @returns {Array.<module:engine/view/stylesmap~PropertyDescriptor>}\n\t */\n\t_getStylesEntries() {\n\t\tconst parsed = [];\n\n\t\tconst keys = Object.keys( this._styles );\n\n\t\tfor ( const key of keys ) {\n\t\t\tparsed.push( ...this._styleProcessor.getReducedForm( key, this._styles ) );\n\t\t}\n\n\t\treturn parsed;\n\t}\n\n\t/**\n\t * Removes empty objects upon removing an entry from internal object.\n\t *\n\t * @param {String} path\n\t * @private\n\t */\n\t_cleanEmptyObjectsOnPath( path ) {\n\t\tconst pathParts = path.split( '.' );\n\t\tconst isChildPath = pathParts.length > 1;\n\n\t\tif ( !isChildPath ) {\n\t\t\treturn;\n\t\t}\n\n\t\tconst parentPath = pathParts.splice( 0, pathParts.length - 1 ).join( '.' );\n\n\t\tconst parentObject = get( this._styles, parentPath );\n\n\t\tif ( !parentObject ) {\n\t\t\treturn;\n\t\t}\n\n\t\tconst isParentEmpty = !Array.from( Object.keys( parentObject ) ).length;\n\n\t\tif ( isParentEmpty ) {\n\t\t\tthis.remove( parentPath );\n\t\t}\n\t}\n}\n\n/**\n * Style processor is responsible for writing and reading a normalized styles object.\n */\nexport class StylesProcessor {\n\t/**\n\t * Creates StylesProcessor instance.\n\t *\n\t * @private\n\t */\n\tconstructor() {\n\t\tthis._normalizers = new Map();\n\t\tthis._extractors = new Map();\n\t\tthis._reducers = new Map();\n\t\tthis._consumables = new Map();\n\t}\n\n\t/**\n\t * Parse style string value to a normalized object and appends it to styles object.\n\t *\n\t *\t\tconst styles = {};\n\t *\n\t *\t\tstylesProcessor.toNormalizedForm( 'margin', '1px', styles );\n\t *\n\t *\t\t// styles will consist: { margin: { top: '1px', right: '1px', bottom: '1px', left: '1px; } }\n\t *\n\t * **Note**: To define normalizer callbacks use {@link #setNormalizer}.\n\t *\n\t * @param {String} name Name of style property.\n\t * @param {String} propertyValue Value of style property.\n\t * @param {Object} styles Object holding normalized styles.\n\t */\n\ttoNormalizedForm( name, propertyValue, styles ) {\n\t\tif ( isObject( propertyValue ) ) {\n\t\t\tappendStyleValue( styles, toPath( name ), propertyValue );\n\n\t\t\treturn;\n\t\t}\n\n\t\tif ( this._normalizers.has( name ) ) {\n\t\t\tconst normalizer = this._normalizers.get( name );\n\n\t\t\tconst { path, value } = normalizer( propertyValue );\n\n\t\t\tappendStyleValue( styles, path, value );\n\t\t} else {\n\t\t\tappendStyleValue( styles, name, propertyValue );\n\t\t}\n\t}\n\n\t/**\n\t * Returns a normalized version of a style property.\n\t *\t\tconst styles = {\n\t *\t\t\tmargin: { top: '1px', right: '1px', bottom: '1px', left: '1px; },\n\t *\t\t\tbackground: { color: '#f00' }\n\t *\t\t};\n\t *\n\t *\t\tstylesProcessor.getNormalized( 'background' );\n\t *\t\t// will return: { color: '#f00' }\n\t *\n\t *\t\tstylesProcessor.getNormalized( 'margin-top' );\n\t *\t\t// will return: '1px'\n\t *\n\t * **Note**: In some cases extracting single value requires defining an extractor callback {@link #setExtractor}.\n\t *\n\t * @param {String} name Name of style property.\n\t * @param {Object} styles Object holding normalized styles.\n\t * @returns {*}\n\t */\n\tgetNormalized( name, styles ) {\n\t\tif ( !name ) {\n\t\t\treturn merge( {}, styles );\n\t\t}\n\n\t\t// Might be empty string.\n\t\tif ( styles[ name ] !== undefined ) {\n\t\t\treturn styles[ name ];\n\t\t}\n\n\t\tif ( this._extractors.has( name ) ) {\n\t\t\tconst extractor = this._extractors.get( name );\n\n\t\t\tif ( typeof extractor === 'string' ) {\n\t\t\t\treturn get( styles, extractor );\n\t\t\t}\n\n\t\t\tconst value = extractor( name, styles );\n\n\t\t\tif ( value ) {\n\t\t\t\treturn value;\n\t\t\t}\n\t\t}\n\n\t\treturn get( styles, toPath( name ) );\n\t}\n\n\t/**\n\t * Returns a reduced form of style property form normalized object.\n\t *\n\t * For default margin reducer, the below code:\n\t *\n\t *\t\tstylesProcessor.getReducedForm( 'margin', {\n\t *\t\t\tmargin: { top: '1px', right: '1px', bottom: '2px', left: '1px; }\n\t *\t\t} );\n\t *\n\t * will return:\n\t *\n\t *\t\t[\n\t *\t\t\t[ 'margin', '1px 1px 2px' ]\n\t *\t\t]\n\t *\n\t * because it might be represented as a shorthand 'margin' value. However if one of margin long hand values is missing it should return:\n\t *\n\t *\t\t[\n\t *\t\t\t[ 'margin-top', '1px' ],\n\t *\t\t\t[ 'margin-right', '1px' ],\n\t *\t\t\t[ 'margin-bottom', '2px' ]\n\t *\t\t\t// the 'left' value is missing - cannot use 'margin' shorthand.\n\t *\t\t]\n\t *\n\t * **Note**: To define reducer callbacks use {@link #setReducer}.\n\t *\n\t * @param {String} name\n\t * @param {String} name Name of style property.\n\t * @param {Object} styles Object holding normalized styles.\n\t * @returns {Array.<module:engine/view/stylesmap~PropertyDescriptor>}\n\t */\n\tgetReducedForm( name, styles ) {\n\t\tconst normalizedValue = this.getNormalized( name, styles );\n\n\t\t// Might be empty string.\n\t\tif ( normalizedValue === undefined ) {\n\t\t\treturn [];\n\t\t}\n\n\t\tif ( this._reducers.has( name ) ) {\n\t\t\tconst reducer = this._reducers.get( name );\n\n\t\t\treturn reducer( normalizedValue );\n\t\t}\n\n\t\treturn [ [ name, normalizedValue ] ];\n\t}\n\n\t/**\n\t * Returns related style names.\n\t *\n\t *\t\tstylesProcessor.getRelatedStyles( 'margin' );\n\t *\t\t// will return: [ 'margin-top', 'margin-right', 'margin-bottom', 'margin-left' ];\n\t *\n\t *\t\tstylesProcessor.getRelatedStyles( 'margin-top' );\n\t *\t\t// will return: [ 'margin' ];\n\t *\n\t * **Note**: To define new style relations load an existing style processor or use\n\t * {@link module:engine/view/stylesmap~StylesProcessor#setStyleRelation `StylesProcessor.setStyleRelation()`}.\n\t *\n\t * @param {String} name\n\t * @returns {Array.<String>}\n\t */\n\tgetRelatedStyles( name ) {\n\t\treturn this._consumables.get( name ) || [];\n\t}\n\n\t/**\n\t * Adds a normalizer method for a style property.\n\t *\n\t * A normalizer returns describing how the value should be normalized.\n\t *\n\t * For instance 'margin' style is a shorthand for four margin values:\n\t *\n\t * - 'margin-top'\n\t * - 'margin-right'\n\t * - 'margin-bottom'\n\t * - 'margin-left'\n\t *\n\t * and can be written in various ways if some values are equal to others. For instance `'margin: 1px 2em;'` is a shorthand for\n\t * `'margin-top: 1px;margin-right: 2em;margin-bottom: 1px;margin-left: 2em'`.\n\t *\n\t * A normalizer should parse various margin notations as a single object:\n\t *\n\t *\t\tconst styles = {\n\t *\t\t\tmargin: {\n\t *\t\t\t\ttop: '1px',\n\t *\t\t\t\tright: '2em',\n\t *\t\t\t\tbottom: '1px',\n\t *\t\t\t\tleft: '2em'\n\t *\t\t\t}\n\t *\t\t};\n\t *\n\t * Thus a normalizer for 'margin' style should return an object defining style path and value to store:\n\t *\n\t *\t\tconst returnValue = {\n\t *\t\t\tpath: 'margin',\n\t *\t\t\tvalue: {\n\t *\t\t\t\ttop: '1px',\n\t *\t\t\t\tright: '2em',\n\t *\t\t\t\tbottom: '1px',\n\t *\t\t\t\tleft: '2em'\n\t *\t\t\t}\n\t *\t\t};\n\t *\n\t * Additionally to fully support all margin notations there should be also defined 4 normalizers for longhand margin notations. Below\n\t * is an example for 'margin-top' style property normalizer:\n\t *\n\t *\t\tstylesProcessor.setNormalizer( 'margin-top', valueString => {\n\t *\t\t\treturn {\n\t *\t\t\t\tpath: 'margin.top',\n\t *\t\t\t\tvalue: valueString\n\t *\t\t\t}\n\t *\t\t} );\n\t *\n\t * @param {String} name\n\t * @param {Function} callback\n\t */\n\tsetNormalizer( name, callback ) {\n\t\tthis._normalizers.set( name, callback );\n\t}\n\n\t/**\n\t * Adds a extractor callback for a style property.\n\t *\n\t * Most normalized style values are stored as one level objects. It is assumed that `'margin-top'` style will be stored as:\n\t *\n\t *\t\tconst styles = {\n\t *\t\t\tmargin: {\n\t *\t\t\t\ttop: 'value'\n\t *\t\t\t}\n\t *\t\t}\n\t *\n\t * However, some styles can have conflicting notations and thus it might be harder to extract a style value from shorthand. For instance\n\t * the 'border-top-style' can be defined using `'border-top:solid'`, `'border-style:solid none none none'` or by `'border:solid'`\n\t * shorthands. The default border styles processors stores styles as:\n\t *\n\t *\t\tconst styles = {\n\t *\t\t\tborder: {\n\t *\t\t\t\tstyle: {\n\t *\t\t\t\t\ttop: 'solid'\n\t *\t\t\t\t}\n\t *\t\t\t}\n\t *\t\t}\n\t *\n\t * as it is better to modify border style independently from other values. On the other part the output of the border might be\n\t * desired as `border-top`, `border-left`, etc notation.\n\t *\n\t * In the above example a reducer should return a side border value that combines style, color and width:\n\t *\n\t *\t\tstyleProcessor.setExtractor( 'border-top', styles => {\n\t *\t\t\treturn {\n\t *\t\t\t\tcolor: styles.border.color.top,\n\t *\t\t\t\tstyle: styles.border.style.top,\n\t *\t\t\t\twidth: styles.border.width.top\n\t *\t\t\t}\n\t *\t\t} );\n\t *\n\t * @param {String} name\n\t * @param {Function|String} callbackOrPath Callback that return a requested value or path string for single values.\n\t */\n\tsetExtractor( name, callbackOrPath ) {\n\t\tthis._extractors.set( name, callbackOrPath );\n\t}\n\n\t/**\n\t * Adds a reducer callback for a style property.\n\t *\n\t * Reducer returns a minimal notation for given style name. For longhand properties it is not required to write a reducer as\n\t * by default the direct value from style path is taken.\n\t *\n\t * For shorthand styles a reducer should return minimal style notation either by returning single name-value tuple or multiple tuples\n\t * if a shorthand cannot be used. For instance for a margin shorthand a reducer might return:\n\t *\n\t *\t\tconst marginShortHandTuple = [\n\t *\t\t\t[ 'margin', '1px 1px 2px' ]\n\t *\t\t];\n\t *\n\t * or a longhand tuples for defined values:\n\t *\n\t *\t\t// Considering margin.bottom and margin.left are undefined.\n\t *\t\tconst marginLonghandsTuples = [\n\t *\t\t\t[ 'margin-top', '1px' ],\n\t *\t\t\t[ 'margin-right', '1px' ]\n\t *\t\t];\n\t *\n\t * A reducer obtains a normalized style value:\n\t *\n\t *\t\t// Simplified reducer that always outputs 4 values which are always present:\n\t *\t\tstylesProcessor.setReducer( 'margin', margin => {\n\t *\t\t\treturn [\n\t *\t\t\t\t[ 'margin', `${ margin.top } ${ margin.right } ${ margin.bottom } ${ margin.left }` ]\n\t *\t\t\t]\n\t *\t\t} );\n\t *\n\t * @param {String} name\n\t * @param {Function} callback\n\t */\n\tsetReducer( name, callback ) {\n\t\tthis._reducers.set( name, callback );\n\t}\n\n\t/**\n\t * Defines a style shorthand relation to other style notations.\n\t *\n\t *\t\tstylesProcessor.setStyleRelation( 'margin', [\n\t *\t\t\t'margin-top',\n\t *\t\t\t'margin-right',\n\t *\t\t\t'margin-bottom',\n\t *\t\t\t'margin-left'\n\t *\t\t] );\n\t *\n\t * This enables expanding of style names for shorthands. For instance, if defined,\n\t * {@link module:engine/conversion/viewconsumable~ViewConsumable view consumable} items are automatically created\n\t * for long-hand margin style notation alongside the `'margin'` item.\n\t *\n\t * This means that when an element being converted has a style `margin`, a converter for `margin-left` will work just\n\t * fine since the view consumable will contain a consumable `margin-left` item (thanks to the relation) and\n\t * `element.getStyle( 'margin-left' )` will work as well assuming that the style processor was correctly configured.\n\t * However, once `margin-left` is consumed, `margin` will not be consumable anymore.\n\t *\n\t * @param {String} shorthandName\n\t * @param {Array.<String>} styleNames\n\t */\n\tsetStyleRelation( shorthandName, styleNames ) {\n\t\tthis._mapStyleNames( shorthandName, styleNames );\n\n\t\tfor ( const alsoName of styleNames ) {\n\t\t\tthis._mapStyleNames( alsoName, [ shorthandName ] );\n\t\t}\n\t}\n\n\t/**\n\t * Set two-way binding of style names.\n\t *\n\t * @param {String} name\n\t * @param {Array.<String>} styleNames\n\t * @private\n\t */\n\t_mapStyleNames( name, styleNames ) {\n\t\tif ( !this._consumables.has( name ) ) {\n\t\t\tthis._consumables.set( name, [] );\n\t\t}\n\n\t\tthis._consumables.get( name ).push( ...styleNames );\n\t}\n}\n\n// Parses inline styles and puts property - value pairs into styles map.\n//\n// @param {String} stylesString Styles to parse.\n// @returns {Map.<String, String>} stylesMap Map of parsed properties and values.\nfunction parseInlineStyles( stylesString ) {\n\t// `null` if no quote was found in input string or last found quote was a closing quote. See below.\n\tlet quoteType = null;\n\tlet propertyNameStart = 0;\n\tlet propertyValueStart = 0;\n\tlet propertyName = null;\n\n\tconst stylesMap = new Map();\n\n\t// Do not set anything if input string is empty.\n\tif ( stylesString === '' ) {\n\t\treturn stylesMap;\n\t}\n\n\t// Fix inline styles that do not end with `;` so they are compatible with algorithm below.\n\tif ( stylesString.charAt( stylesString.length - 1 ) != ';' ) {\n\t\tstylesString = stylesString + ';';\n\t}\n\n\t// Seek the whole string for \"special characters\".\n\tfor ( let i = 0; i < stylesString.length; i++ ) {\n\t\tconst char = stylesString.charAt( i );\n\n\t\tif ( quoteType === null ) {\n\t\t\t// No quote found yet or last found quote was a closing quote.\n\t\t\tswitch ( char ) {\n\t\t\t\tcase ':':\n\t\t\t\t\t// Most of time colon means that property name just ended.\n\t\t\t\t\t// Sometimes however `:` is found inside property value (for example in background image url).\n\t\t\t\t\tif ( !propertyName ) {\n\t\t\t\t\t\t// Treat this as end of property only if property name is not already saved.\n\t\t\t\t\t\t// Save property name.\n\t\t\t\t\t\tpropertyName = stylesString.substr( propertyNameStart, i - propertyNameStart );\n\t\t\t\t\t\t// Save this point as the start of property value.\n\t\t\t\t\t\tpropertyValueStart = i + 1;\n\t\t\t\t\t}\n\n\t\t\t\t\tbreak;\n\n\t\t\t\tcase '\"':\n\t\t\t\tcase '\\'':\n\t\t\t\t\t// Opening quote found (this is an opening quote, because `quoteType` is `null`).\n\t\t\t\t\tquoteType = char;\n\n\t\t\t\t\tbreak;\n\n\t\t\t\tcase ';': {\n\t\t\t\t\t// Property value just ended.\n\t\t\t\t\t// Use previously stored property value start to obtain property value.\n\t\t\t\t\tconst propertyValue = stylesString.substr( propertyValueStart, i - propertyValueStart );\n\n\t\t\t\t\tif ( propertyName ) {\n\t\t\t\t\t\t// Save parsed part.\n\t\t\t\t\t\tstylesMap.set( propertyName.trim(), propertyValue.trim() );\n\t\t\t\t\t}\n\n\t\t\t\t\tpropertyName = null;\n\n\t\t\t\t\t// Save this point as property name start. Property name starts immediately after previous property value ends.\n\t\t\t\t\tpropertyNameStart = i + 1;\n\n\t\t\t\t\tbreak;\n\t\t\t\t}\n\t\t\t}\n\t\t} else if ( char === quoteType ) {\n\t\t\t// If a quote char is found and it is a closing quote, mark this fact by `null`-ing `quoteType`.\n\t\t\tquoteType = null;\n\t\t}\n\t}\n\n\treturn stylesMap;\n}\n\n// Return lodash compatible path from style name.\nfunction toPath( name ) {\n\treturn name.replace( '-', '.' );\n}\n\n// Appends style definition to the styles object.\n//\n// @param {String} nameOrPath\n// @param {String|Object} valueOrObject\n// @private\nfunction appendStyleValue( stylesObject, nameOrPath, valueOrObject ) {\n\tlet valueToSet = valueOrObject;\n\n\tif ( isObject( valueOrObject ) ) {\n\t\tvalueToSet = merge( {}, get( stylesObject, nameOrPath ), valueOrObject );\n\t}\n\n\tset( stylesObject, nameOrPath, valueToSet );\n}\n\n/**\n * A CSS style property descriptor that contains tuplet of two strings:\n *\n * - first string describes property name\n * - second string describes property value\n *\n *\t\tconst marginDescriptor = [ 'margin', '2px 3em' ];\n *\t\tconst marginTopDescriptor = [ 'margin-top', '2px' ];\n *\n * @typedef {Array.<String, String>} module:engine/view/stylesmap~PropertyDescriptor\n */\n\n/**\n * An object describing values associated with the sides of a box, for instance margins, paddings,\n * border widths, border colors, etc.\n *\n *\t\tconst margin = {\n *\t\t\ttop: '1px',\n *\t\t\tright: '3px',\n *\t\t\tbottom: '3px',\n *\t\t\tleft: '7px'\n *\t\t};\n *\n *\t\tconst borderColor = {\n *\t\t\ttop: 'red',\n *\t\t\tright: 'blue',\n *\t\t\tbottom: 'blue',\n *\t\t\tleft: 'red'\n *\t\t};\n *\n * @typedef {Object} module:engine/view/stylesmap~BoxSides\n *\n * @property {String} top Top side value.\n * @property {String} right Right side value.\n * @property {String} bottom Bottom side value.\n * @property {String} left Left side value.\n */\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module engine/view/element\n */\n\nimport Node from './node';\nimport Text from './text';\nimport TextProxy from './textproxy';\nimport toMap from '@ckeditor/ckeditor5-utils/src/tomap';\nimport toArray from '@ckeditor/ckeditor5-utils/src/toarray';\nimport isIterable from '@ckeditor/ckeditor5-utils/src/isiterable';\nimport Matcher from './matcher';\nimport StylesMap from './stylesmap';\n\n// @if CK_DEBUG_ENGINE // const { convertMapToTags } = require( '../dev-utils/utils' );\n\n/**\n * View element.\n *\n * The editing engine does not define a fixed semantics of its elements (it is \"DTD-free\").\n * This is why the type of the {@link module:engine/view/element~Element} need to\n * be defined by the feature developer. When creating an element you should use one of the following methods:\n *\n * * {@link module:engine/view/downcastwriter~DowncastWriter#createContainerElement `downcastWriter#createContainerElement()`}\n * in order to create a {@link module:engine/view/containerelement~ContainerElement},\n * * {@link module:engine/view/downcastwriter~DowncastWriter#createAttributeElement `downcastWriter#createAttributeElement()`}\n * in order to create a {@link module:engine/view/attributeelement~AttributeElement},\n * * {@link module:engine/view/downcastwriter~DowncastWriter#createEmptyElement `downcastWriter#createEmptyElement()`}\n * in order to create a {@link module:engine/view/emptyelement~EmptyElement}.\n * * {@link module:engine/view/downcastwriter~DowncastWriter#createUIElement `downcastWriter#createUIElement()`}\n * in order to create a {@link module:engine/view/uielement~UIElement}.\n * * {@link module:engine/view/downcastwriter~DowncastWriter#createEditableElement `downcastWriter#createEditableElement()`}\n * in order to create a {@link module:engine/view/editableelement~EditableElement}.\n *\n * Note that for view elements which are not created from the model, like elements from mutations, paste or\n * {@link module:engine/controller/datacontroller~DataController#set data.set} it is not possible to define the type of the element.\n * In such cases the {@link module:engine/view/upcastwriter~UpcastWriter#createElement `UpcastWriter#createElement()`} method\n * should be used to create generic view elements.\n *\n * @extends module:engine/view/node~Node\n */\nexport default class Element extends Node {\n\t/**\n\t * Creates a view element.\n\t *\n\t * Attributes can be passed in various formats:\n\t *\n\t *\t\tnew Element( viewDocument, 'div', { class: 'editor', contentEditable: 'true' } ); // object\n\t *\t\tnew Element( viewDocument, 'div', [ [ 'class', 'editor' ], [ 'contentEditable', 'true' ] ] ); // map-like iterator\n\t *\t\tnew Element( viewDocument, 'div', mapOfAttributes ); // map\n\t *\n\t * @protected\n\t * @param {module:engine/view/document~Document} document The document instance to which this element belongs.\n\t * @param {String} name Node name.\n\t * @param {Object|Iterable} [attrs] Collection of attributes.\n\t * @param {module:engine/view/node~Node|Iterable.<module:engine/view/node~Node>} [children]\n\t * A list of nodes to be inserted into created element.\n\t */\n\tconstructor( document, name, attrs, children ) {\n\t\tsuper( document );\n\n\t\t/**\n\t\t * Name of the element.\n\t\t *\n\t\t * @readonly\n\t\t * @member {String}\n\t\t */\n\t\tthis.name = name;\n\n\t\t/**\n\t\t * Map of attributes, where attributes names are keys and attributes values are values.\n\t\t *\n\t\t * @protected\n\t\t * @member {Map} #_attrs\n\t\t */\n\t\tthis._attrs = parseAttributes( attrs );\n\n\t\t/**\n\t\t * Array of child nodes.\n\t\t *\n\t\t * @protected\n\t\t * @member {Array.<module:engine/view/node~Node>}\n\t\t */\n\t\tthis._children = [];\n\n\t\tif ( children ) {\n\t\t\tthis._insertChild( 0, children );\n\t\t}\n\n\t\t/**\n\t\t * Set of classes associated with element instance.\n\t\t *\n\t\t * @protected\n\t\t * @member {Set}\n\t\t */\n\t\tthis._classes = new Set();\n\n\t\tif ( this._attrs.has( 'class' ) ) {\n\t\t\t// Remove class attribute and handle it by class set.\n\t\t\tconst classString = this._attrs.get( 'class' );\n\t\t\tparseClasses( this._classes, classString );\n\t\t\tthis._attrs.delete( 'class' );\n\t\t}\n\n\t\t/**\n\t\t * Normalized styles.\n\t\t *\n\t\t * @protected\n\t\t * @member {module:engine/view/stylesmap~StylesMap} module:engine/view/element~Element#_styles\n\t\t */\n\t\tthis._styles = new StylesMap( this.document.stylesProcessor );\n\n\t\tif ( this._attrs.has( 'style' ) ) {\n\t\t\t// Remove style attribute and handle it by styles map.\n\t\t\tthis._styles.setTo( this._attrs.get( 'style' ) );\n\n\t\t\tthis._attrs.delete( 'style' );\n\t\t}\n\n\t\t/**\n\t\t * Map of custom properties.\n\t\t * Custom properties can be added to element instance, will be cloned but not rendered into DOM.\n\t\t *\n\t\t * @protected\n\t\t * @member {Map}\n\t\t */\n\t\tthis._customProperties = new Map();\n\t}\n\n\t/**\n\t * Number of element's children.\n\t *\n\t * @readonly\n\t * @type {Number}\n\t */\n\tget childCount() {\n\t\treturn this._children.length;\n\t}\n\n\t/**\n\t * Is `true` if there are no nodes inside this element, `false` otherwise.\n\t *\n\t * @readonly\n\t * @type {Boolean}\n\t */\n\tget isEmpty() {\n\t\treturn this._children.length === 0;\n\t}\n\n\t/**\n\t * Checks whether this object is of the given.\n\t *\n\t *\t\telement.is( 'element' ); // -> true\n\t *\t\telement.is( 'node' ); // -> true\n\t *\t\telement.is( 'view:element' ); // -> true\n\t *\t\telement.is( 'view:node' ); // -> true\n\t *\n\t *\t\telement.is( 'model:element' ); // -> false\n\t *\t\telement.is( 'documentSelection' ); // -> false\n\t *\n\t * Assuming that the object being checked is an element, you can also check its\n\t * {@link module:engine/view/element~Element#name name}:\n\t *\n\t *\t\telement.is( 'element', 'img' ); // -> true if this is an <img> element\n\t *\t\ttext.is( 'element', 'img' ); -> false\n\t *\n\t * {@link module:engine/view/node~Node#is Check the entire list of view objects} which implement the `is()` method.\n\t *\n\t * @param {String} type Type to check.\n\t * @param {String} [name] Element name.\n\t * @returns {Boolean}\n\t */\n\tis( type, name = null ) {\n\t\tif ( !name ) {\n\t\t\treturn type === 'element' || type === 'view:element' ||\n\t\t\t\t// From super.is(). This is highly utilised method and cannot call super. See ckeditor/ckeditor5#6529.\n\t\t\t\ttype === 'node' || type === 'view:node';\n\t\t} else {\n\t\t\treturn name === this.name && ( type === 'element' || type === 'view:element' );\n\t\t}\n\t}\n\n\t/**\n\t * Gets child at the given index.\n\t *\n\t * @param {Number} index Index of child.\n\t * @returns {module:engine/view/node~Node} Child node.\n\t */\n\tgetChild( index ) {\n\t\treturn this._children[ index ];\n\t}\n\n\t/**\n\t * Gets index of the given child node. Returns `-1` if child node is not found.\n\t *\n\t * @param {module:engine/view/node~Node} node Child node.\n\t * @returns {Number} Index of the child node.\n\t */\n\tgetChildIndex( node ) {\n\t\treturn this._children.indexOf( node );\n\t}\n\n\t/**\n\t * Gets child nodes iterator.\n\t *\n\t * @returns {Iterable.<module:engine/view/node~Node>} Child nodes iterator.\n\t */\n\tgetChildren() {\n\t\treturn this._children[ Symbol.iterator ]();\n\t}\n\n\t/**\n\t * Returns an iterator that contains the keys for attributes. Order of inserting attributes is not preserved.\n\t *\n\t * @returns {Iterable.<String>} Keys for attributes.\n\t */\n\t* getAttributeKeys() {\n\t\tif ( this._classes.size > 0 ) {\n\t\t\tyield 'class';\n\t\t}\n\n\t\tif ( !this._styles.isEmpty ) {\n\t\t\tyield 'style';\n\t\t}\n\n\t\tyield* this._attrs.keys();\n\t}\n\n\t/**\n\t * Returns iterator that iterates over this element's attributes.\n\t *\n\t * Attributes are returned as arrays containing two items. First one is attribute key and second is attribute value.\n\t * This format is accepted by native `Map` object and also can be passed in `Node` constructor.\n\t *\n\t * @returns {Iterable.<*>}\n\t */\n\t* getAttributes() {\n\t\tyield* this._attrs.entries();\n\n\t\tif ( this._classes.size > 0 ) {\n\t\t\tyield [ 'class', this.getAttribute( 'class' ) ];\n\t\t}\n\n\t\tif ( !this._styles.isEmpty ) {\n\t\t\tyield [ 'style', this.getAttribute( 'style' ) ];\n\t\t}\n\t}\n\n\t/**\n\t * Gets attribute by key. If attribute is not present - returns undefined.\n\t *\n\t * @param {String} key Attribute key.\n\t * @returns {String|undefined} Attribute value.\n\t */\n\tgetAttribute( key ) {\n\t\tif ( key == 'class' ) {\n\t\t\tif ( this._classes.size > 0 ) {\n\t\t\t\treturn [ ...this._classes ].join( ' ' );\n\t\t\t}\n\n\t\t\treturn undefined;\n\t\t}\n\n\t\tif ( key == 'style' ) {\n\t\t\tconst inlineStyle = this._styles.toString();\n\n\t\t\treturn inlineStyle == '' ? undefined : inlineStyle;\n\t\t}\n\n\t\treturn this._attrs.get( key );\n\t}\n\n\t/**\n\t * Returns a boolean indicating whether an attribute with the specified key exists in the element.\n\t *\n\t * @param {String} key Attribute key.\n\t * @returns {Boolean} `true` if attribute with the specified key exists in the element, false otherwise.\n\t */\n\thasAttribute( key ) {\n\t\tif ( key == 'class' ) {\n\t\t\treturn this._classes.size > 0;\n\t\t}\n\n\t\tif ( key == 'style' ) {\n\t\t\treturn !this._styles.isEmpty;\n\t\t}\n\n\t\treturn this._attrs.has( key );\n\t}\n\n\t/**\n\t * Checks if this element is similar to other element.\n\t * Both elements should have the same name and attributes to be considered as similar. Two similar elements\n\t * can contain different set of children nodes.\n\t *\n\t * @param {module:engine/view/element~Element} otherElement\n\t * @returns {Boolean}\n\t */\n\tisSimilar( otherElement ) {\n\t\tif ( !( otherElement instanceof Element ) ) {\n\t\t\treturn false;\n\t\t}\n\n\t\t// If exactly the same Element is provided - return true immediately.\n\t\tif ( this === otherElement ) {\n\t\t\treturn true;\n\t\t}\n\n\t\t// Check element name.\n\t\tif ( this.name != otherElement.name ) {\n\t\t\treturn false;\n\t\t}\n\n\t\t// Check number of attributes, classes and styles.\n\t\tif ( this._attrs.size !== otherElement._attrs.size || this._classes.size !== otherElement._classes.size ||\n\t\t\tthis._styles.size !== otherElement._styles.size ) {\n\t\t\treturn false;\n\t\t}\n\n\t\t// Check if attributes are the same.\n\t\tfor ( const [ key, value ] of this._attrs ) {\n\t\t\tif ( !otherElement._attrs.has( key ) || otherElement._attrs.get( key ) !== value ) {\n\t\t\t\treturn false;\n\t\t\t}\n\t\t}\n\n\t\t// Check if classes are the same.\n\t\tfor ( const className of this._classes ) {\n\t\t\tif ( !otherElement._classes.has( className ) ) {\n\t\t\t\treturn false;\n\t\t\t}\n\t\t}\n\n\t\t// Check if styles are the same.\n\t\tfor ( const property of this._styles.getStyleNames() ) {\n\t\t\tif (\n\t\t\t\t!otherElement._styles.has( property ) ||\n\t\t\t\totherElement._styles.getAsString( property ) !== this._styles.getAsString( property )\n\t\t\t) {\n\t\t\t\treturn false;\n\t\t\t}\n\t\t}\n\n\t\treturn true;\n\t}\n\n\t/**\n\t * Returns true if class is present.\n\t * If more then one class is provided - returns true only when all classes are present.\n\t *\n\t *\t\telement.hasClass( 'foo' ); // Returns true if 'foo' class is present.\n\t *\t\telement.hasClass( 'foo', 'bar' ); // Returns true if 'foo' and 'bar' classes are both present.\n\t *\n\t * @param {...String} className\n\t */\n\thasClass( ...className ) {\n\t\tfor ( const name of className ) {\n\t\t\tif ( !this._classes.has( name ) ) {\n\t\t\t\treturn false;\n\t\t\t}\n\t\t}\n\n\t\treturn true;\n\t}\n\n\t/**\n\t * Returns iterator that contains all class names.\n\t *\n\t * @returns {Iterable.<String>}\n\t */\n\tgetClassNames() {\n\t\treturn this._classes.keys();\n\t}\n\n\t/**\n\t * Returns style value for the given property mae.\n\t * If the style does not exist `undefined` is returned.\n\t *\n\t * **Note**: This method can work with normalized style names if\n\t * {@link module:engine/controller/datacontroller~DataController#addStyleProcessorRules a particular style processor rule is enabled}.\n\t * See {@link module:engine/view/stylesmap~StylesMap#getAsString `StylesMap#getAsString()`} for details.\n\t *\n\t * For an element with style set to `'margin:1px'`:\n\t *\n\t *\t\t// Enable 'margin' shorthand processing:\n\t *\t\teditor.data.addStyleProcessorRules( addMarginRules );\n\t *\n\t *\t\tconst element = view.change( writer => {\n\t *\t\t\tconst element = writer.createElement();\n\t *\t\t\twriter.setStyle( 'margin', '1px' );\n\t *\t\t\twriter.setStyle( 'margin-bottom', '3em' );\n\t *\n\t *\t\t\treturn element;\n\t *\t\t} );\n\t *\n\t *\t\telement.getStyle( 'margin' ); // -> 'margin: 1px 1px 3em;'\n\t *\n\t * @param {String} property\n\t * @returns {String|undefined}\n\t */\n\tgetStyle( property ) {\n\t\treturn this._styles.getAsString( property );\n\t}\n\n\t/**\n\t * Returns a normalized style object or single style value.\n\t *\n\t * For an element with style set to: margin:1px 2px 3em;\n\t *\n\t *\t\telement.getNormalizedStyle( 'margin' ) );\n\t *\n\t * will return:\n\t *\n\t *\t\t{\n\t *\t\t\ttop: '1px',\n\t *\t\t\tright: '2px',\n\t *\t\t\tbottom: '3em',\n\t *\t\t\tleft: '2px'    // a normalized value from margin shorthand\n\t *\t\t}\n\t *\n\t * and reading for single style value:\n\t *\n\t *\t\tstyles.getNormalizedStyle( 'margin-left' );\n\t *\n\t * Will return a `2px` string.\n\t *\n\t * **Note**: This method will return normalized values only if\n\t * {@link module:engine/controller/datacontroller~DataController#addStyleProcessorRules a particular style processor rule is enabled}.\n\t * See {@link module:engine/view/stylesmap~StylesMap#getNormalized `StylesMap#getNormalized()`} for details.\n\t *\n\t *\n\t * @param {String} property Name of CSS property\n\t * @returns {Object|String|undefined}\n\t */\n\tgetNormalizedStyle( property ) {\n\t\treturn this._styles.getNormalized( property );\n\t}\n\n\t/**\n\t * Returns iterator that contains all style names.\n\t *\n\t * @returns {Iterable.<String>}\n\t */\n\tgetStyleNames() {\n\t\treturn this._styles.getStyleNames();\n\t}\n\n\t/**\n\t * Returns true if style keys are present.\n\t * If more then one style property is provided - returns true only when all properties are present.\n\t *\n\t *\t\telement.hasStyle( 'color' ); // Returns true if 'border-top' style is present.\n\t *\t\telement.hasStyle( 'color', 'border-top' ); // Returns true if 'color' and 'border-top' styles are both present.\n\t *\n\t * @param {...String} property\n\t */\n\thasStyle( ...property ) {\n\t\tfor ( const name of property ) {\n\t\t\tif ( !this._styles.has( name ) ) {\n\t\t\t\treturn false;\n\t\t\t}\n\t\t}\n\n\t\treturn true;\n\t}\n\n\t/**\n\t * Returns ancestor element that match specified pattern.\n\t * Provided patterns should be compatible with {@link module:engine/view/matcher~Matcher Matcher} as it is used internally.\n\t *\n\t * @see module:engine/view/matcher~Matcher\n\t * @param {Object|String|RegExp|Function} patterns Patterns used to match correct ancestor.\n\t * See {@link module:engine/view/matcher~Matcher}.\n\t * @returns {module:engine/view/element~Element|null} Found element or `null` if no matching ancestor was found.\n\t */\n\tfindAncestor( ...patterns ) {\n\t\tconst matcher = new Matcher( ...patterns );\n\t\tlet parent = this.parent;\n\n\t\twhile ( parent ) {\n\t\t\tif ( matcher.match( parent ) ) {\n\t\t\t\treturn parent;\n\t\t\t}\n\n\t\t\tparent = parent.parent;\n\t\t}\n\n\t\treturn null;\n\t}\n\n\t/**\n\t * Returns the custom property value for the given key.\n\t *\n\t * @param {String|Symbol} key\n\t * @returns {*}\n\t */\n\tgetCustomProperty( key ) {\n\t\treturn this._customProperties.get( key );\n\t}\n\n\t/**\n\t * Returns an iterator which iterates over this element's custom properties.\n\t * Iterator provides `[ key, value ]` pairs for each stored property.\n\t *\n\t * @returns {Iterable.<*>}\n\t */\n\t* getCustomProperties() {\n\t\tyield* this._customProperties.entries();\n\t}\n\n\t/**\n\t * Returns identity string based on element's name, styles, classes and other attributes.\n\t * Two elements that {@link #isSimilar are similar} will have same identity string.\n\t * It has the following format:\n\t *\n\t *\t\t'name class=\"class1,class2\" style=\"style1:value1;style2:value2\" attr1=\"val1\" attr2=\"val2\"'\n \t *\n\t * For example:\n\t *\n\t *\t\tconst element = writer.createContainerElement( 'foo', {\n\t *\t\t\tbanana: '10',\n\t *\t\t\tapple: '20',\n\t *\t\t\tstyle: 'color: red; border-color: white;',\n\t *\t\t\tclass: 'baz'\n\t *\t\t} );\n\t *\n\t *\t\t// returns 'foo class=\"baz\" style=\"border-color:white;color:red\" apple=\"20\" banana=\"10\"'\n\t *\t\telement.getIdentity();\n\t *\n\t * **Note**: Classes, styles and other attributes are sorted alphabetically.\n\t *\n\t * @returns {String}\n\t */\n\tgetIdentity() {\n\t\tconst classes = Array.from( this._classes ).sort().join( ',' );\n\t\tconst styles = this._styles.toString();\n\t\tconst attributes = Array.from( this._attrs ).map( i => `${ i[ 0 ] }=\"${ i[ 1 ] }\"` ).sort().join( ' ' );\n\n\t\treturn this.name +\n\t\t\t( classes == '' ? '' : ` class=\"${ classes }\"` ) +\n\t\t\t( !styles ? '' : ` style=\"${ styles }\"` ) +\n\t\t\t( attributes == '' ? '' : ` ${ attributes }` );\n\t}\n\n\t/**\n\t * Clones provided element.\n\t *\n\t * @protected\n\t * @param {Boolean} [deep=false] If set to `true` clones element and all its children recursively. When set to `false`,\n\t * element will be cloned without any children.\n\t * @returns {module:engine/view/element~Element} Clone of this element.\n\t */\n\t_clone( deep = false ) {\n\t\tconst childrenClone = [];\n\n\t\tif ( deep ) {\n\t\t\tfor ( const child of this.getChildren() ) {\n\t\t\t\tchildrenClone.push( child._clone( deep ) );\n\t\t\t}\n\t\t}\n\n\t\t// ContainerElement and AttributeElement should be also cloned properly.\n\t\tconst cloned = new this.constructor( this.document, this.name, this._attrs, childrenClone );\n\n\t\t// Classes and styles are cloned separately - this solution is faster than adding them back to attributes and\n\t\t// parse once again in constructor.\n\t\tcloned._classes = new Set( this._classes );\n\t\tcloned._styles.set( this._styles.getNormalized() );\n\n\t\t// Clone custom properties.\n\t\tcloned._customProperties = new Map( this._customProperties );\n\n\t\t// Clone filler offset method.\n\t\t// We can't define this method in a prototype because it's behavior which\n\t\t// is changed by e.g. toWidget() function from ckeditor5-widget. Perhaps this should be one of custom props.\n\t\tcloned.getFillerOffset = this.getFillerOffset;\n\n\t\treturn cloned;\n\t}\n\n\t/**\n\t * {@link module:engine/view/element~Element#_insertChild Insert} a child node or a list of child nodes at the end of this node\n\t * and sets the parent of these nodes to this element.\n\t *\n\t * @see module:engine/view/downcastwriter~DowncastWriter#insert\n\t * @protected\n\t * @param {module:engine/view/item~Item|Iterable.<module:engine/view/item~Item>} items Items to be inserted.\n\t * @fires module:engine/view/node~Node#change\n\t * @returns {Number} Number of appended nodes.\n\t */\n\t_appendChild( items ) {\n\t\treturn this._insertChild( this.childCount, items );\n\t}\n\n\t/**\n\t * Inserts a child node or a list of child nodes on the given index and sets the parent of these nodes to\n\t * this element.\n\t *\n\t * @see module:engine/view/downcastwriter~DowncastWriter#insert\n\t * @protected\n\t * @param {Number} index Position where nodes should be inserted.\n\t * @param {module:engine/view/item~Item|Iterable.<module:engine/view/item~Item>} items Items to be inserted.\n\t * @fires module:engine/view/node~Node#change\n\t * @returns {Number} Number of inserted nodes.\n\t */\n\t_insertChild( index, items ) {\n\t\tthis._fireChange( 'children', this );\n\t\tlet count = 0;\n\n\t\tconst nodes = normalize( this.document, items );\n\n\t\tfor ( const node of nodes ) {\n\t\t\t// If node that is being added to this element is already inside another element, first remove it from the old parent.\n\t\t\tif ( node.parent !== null ) {\n\t\t\t\tnode._remove();\n\t\t\t}\n\n\t\t\tnode.parent = this;\n\t\t\tnode.document = this.document;\n\n\t\t\tthis._children.splice( index, 0, node );\n\t\t\tindex++;\n\t\t\tcount++;\n\t\t}\n\n\t\treturn count;\n\t}\n\n\t/**\n\t * Removes number of child nodes starting at the given index and set the parent of these nodes to `null`.\n\t *\n\t * @see module:engine/view/downcastwriter~DowncastWriter#remove\n\t * @protected\n\t * @param {Number} index Number of the first node to remove.\n\t * @param {Number} [howMany=1] Number of nodes to remove.\n\t * @fires module:engine/view/node~Node#change\n\t * @returns {Array.<module:engine/view/node~Node>} The array of removed nodes.\n\t */\n\t_removeChildren( index, howMany = 1 ) {\n\t\tthis._fireChange( 'children', this );\n\n\t\tfor ( let i = index; i < index + howMany; i++ ) {\n\t\t\tthis._children[ i ].parent = null;\n\t\t}\n\n\t\treturn this._children.splice( index, howMany );\n\t}\n\n\t/**\n\t * Adds or overwrite attribute with a specified key and value.\n\t *\n\t * @see module:engine/view/downcastwriter~DowncastWriter#setAttribute\n\t * @protected\n\t * @param {String} key Attribute key.\n\t * @param {String} value Attribute value.\n\t * @fires module:engine/view/node~Node#change\n\t */\n\t_setAttribute( key, value ) {\n\t\tvalue = String( value );\n\n\t\tthis._fireChange( 'attributes', this );\n\n\t\tif ( key == 'class' ) {\n\t\t\tparseClasses( this._classes, value );\n\t\t} else if ( key == 'style' ) {\n\t\t\tthis._styles.setTo( value );\n\t\t} else {\n\t\t\tthis._attrs.set( key, value );\n\t\t}\n\t}\n\n\t/**\n\t * Removes attribute from the element.\n\t *\n\t * @see module:engine/view/downcastwriter~DowncastWriter#removeAttribute\n\t * @protected\n\t * @param {String} key Attribute key.\n\t * @returns {Boolean} Returns true if an attribute existed and has been removed.\n\t * @fires module:engine/view/node~Node#change\n\t */\n\t_removeAttribute( key ) {\n\t\tthis._fireChange( 'attributes', this );\n\n\t\t// Remove class attribute.\n\t\tif ( key == 'class' ) {\n\t\t\tif ( this._classes.size > 0 ) {\n\t\t\t\tthis._classes.clear();\n\n\t\t\t\treturn true;\n\t\t\t}\n\n\t\t\treturn false;\n\t\t}\n\n\t\t// Remove style attribute.\n\t\tif ( key == 'style' ) {\n\t\t\tif ( !this._styles.isEmpty ) {\n\t\t\t\tthis._styles.clear();\n\n\t\t\t\treturn true;\n\t\t\t}\n\n\t\t\treturn false;\n\t\t}\n\n\t\t// Remove other attributes.\n\t\treturn this._attrs.delete( key );\n\t}\n\n\t/**\n\t * Adds specified class.\n\t *\n\t *\t\telement._addClass( 'foo' ); // Adds 'foo' class.\n\t *\t\telement._addClass( [ 'foo', 'bar' ] ); // Adds 'foo' and 'bar' classes.\n\t *\n\t * @see module:engine/view/downcastwriter~DowncastWriter#addClass\n\t * @protected\n\t * @param {Array.<String>|String} className\n\t * @fires module:engine/view/node~Node#change\n\t */\n\t_addClass( className ) {\n\t\tthis._fireChange( 'attributes', this );\n\n\t\tfor ( const name of toArray( className ) ) {\n\t\t\tthis._classes.add( name );\n\t\t}\n\t}\n\n\t/**\n\t * Removes specified class.\n\t *\n\t *\t\telement._removeClass( 'foo' );  // Removes 'foo' class.\n\t *\t\telement._removeClass( [ 'foo', 'bar' ] ); // Removes both 'foo' and 'bar' classes.\n\t *\n\t * @see module:engine/view/downcastwriter~DowncastWriter#removeClass\n\t * @protected\n\t * @param {Array.<String>|String} className\n\t * @fires module:engine/view/node~Node#change\n\t */\n\t_removeClass( className ) {\n\t\tthis._fireChange( 'attributes', this );\n\n\t\tfor ( const name of toArray( className ) ) {\n\t\t\tthis._classes.delete( name );\n\t\t}\n\t}\n\n\t/**\n\t * Adds style to the element.\n\t *\n\t *\t\telement._setStyle( 'color', 'red' );\n\t *\t\telement._setStyle( {\n\t *\t\t\tcolor: 'red',\n\t *\t\t\tposition: 'fixed'\n\t *\t\t} );\n\t *\n\t * **Note**: This method can work with normalized style names if\n\t * {@link module:engine/controller/datacontroller~DataController#addStyleProcessorRules a particular style processor rule is enabled}.\n\t * See {@link module:engine/view/stylesmap~StylesMap#set `StylesMap#set()`} for details.\n\t *\n\t * @see module:engine/view/downcastwriter~DowncastWriter#setStyle\n\t * @protected\n\t * @param {String|Object} property Property name or object with key - value pairs.\n\t * @param {String} [value] Value to set. This parameter is ignored if object is provided as the first parameter.\n\t * @fires module:engine/view/node~Node#change\n\t */\n\t_setStyle( property, value ) {\n\t\tthis._fireChange( 'attributes', this );\n\n\t\tthis._styles.set( property, value );\n\t}\n\n\t/**\n\t * Removes specified style.\n\t *\n\t *\t\telement._removeStyle( 'color' );  // Removes 'color' style.\n\t *\t\telement._removeStyle( [ 'color', 'border-top' ] ); // Removes both 'color' and 'border-top' styles.\n\t *\n\t * **Note**: This method can work with normalized style names if\n\t * {@link module:engine/controller/datacontroller~DataController#addStyleProcessorRules a particular style processor rule is enabled}.\n\t * See {@link module:engine/view/stylesmap~StylesMap#remove `StylesMap#remove()`} for details.\n\t *\n\t * @see module:engine/view/downcastwriter~DowncastWriter#removeStyle\n\t * @protected\n\t * @param {Array.<String>|String} property\n\t * @fires module:engine/view/node~Node#change\n\t */\n\t_removeStyle( property ) {\n\t\tthis._fireChange( 'attributes', this );\n\n\t\tfor ( const name of toArray( property ) ) {\n\t\t\tthis._styles.remove( name );\n\t\t}\n\t}\n\n\t/**\n\t * Sets a custom property. Unlike attributes, custom properties are not rendered to the DOM,\n\t * so they can be used to add special data to elements.\n\t *\n\t * @see module:engine/view/downcastwriter~DowncastWriter#setCustomProperty\n\t * @protected\n\t * @param {String|Symbol} key\n\t * @param {*} value\n\t */\n\t_setCustomProperty( key, value ) {\n\t\tthis._customProperties.set( key, value );\n\t}\n\n\t/**\n\t * Removes the custom property stored under the given key.\n\t *\n\t * @see module:engine/view/downcastwriter~DowncastWriter#removeCustomProperty\n\t * @protected\n\t * @param {String|Symbol} key\n\t * @returns {Boolean} Returns true if property was removed.\n\t */\n\t_removeCustomProperty( key ) {\n\t\treturn this._customProperties.delete( key );\n\t}\n\n\t/**\n\t * Returns block {@link module:engine/view/filler filler} offset or `null` if block filler is not needed.\n\t *\n\t * @abstract\n\t * @method module:engine/view/element~Element#getFillerOffset\n\t */\n\n\t// @if CK_DEBUG_ENGINE // printTree( level = 0) {\n\t// @if CK_DEBUG_ENGINE // \tlet string = '';\n\n\t// @if CK_DEBUG_ENGINE //\tstring += '\\t'.repeat( level ) + `<${ this.name }${ convertMapToTags( this.getAttributes() ) }>`;\n\n\t// @if CK_DEBUG_ENGINE //\tfor ( const child of this.getChildren() ) {\n\t// @if CK_DEBUG_ENGINE //\t\tif ( child.is( '$text' ) ) {\n\t// @if CK_DEBUG_ENGINE //\t\t\tstring += '\\n' + '\\t'.repeat( level + 1 ) + child.data;\n\t// @if CK_DEBUG_ENGINE //\t\t} else {\n\t// @if CK_DEBUG_ENGINE //\t\t\tstring += '\\n' + child.printTree( level + 1 );\n\t// @if CK_DEBUG_ENGINE //\t\t}\n\t// @if CK_DEBUG_ENGINE //\t}\n\n\t// @if CK_DEBUG_ENGINE //\tif ( this.childCount ) {\n\t// @if CK_DEBUG_ENGINE //\t\tstring += '\\n' + '\\t'.repeat( level );\n\t// @if CK_DEBUG_ENGINE //\t}\n\n\t// @if CK_DEBUG_ENGINE //\tstring += `</${ this.name }>`;\n\n\t// @if CK_DEBUG_ENGINE //\treturn string;\n\t// @if CK_DEBUG_ENGINE // }\n\n\t// @if CK_DEBUG_ENGINE // logTree() {\n\t// @if CK_DEBUG_ENGINE // \tconsole.log( this.printTree() );\n\t// @if CK_DEBUG_ENGINE // }\n}\n\n// Parses attributes provided to the element constructor before they are applied to an element. If attributes are passed\n// as an object (instead of `Iterable`), the object is transformed to the map. Attributes with `null` value are removed.\n// Attributes with non-`String` value are converted to `String`.\n//\n// @param {Object|Iterable} attrs Attributes to parse.\n// @returns {Map} Parsed attributes.\nfunction parseAttributes( attrs ) {\n\tattrs = toMap( attrs );\n\n\tfor ( const [ key, value ] of attrs ) {\n\t\tif ( value === null ) {\n\t\t\tattrs.delete( key );\n\t\t} else if ( typeof value != 'string' ) {\n\t\t\tattrs.set( key, String( value ) );\n\t\t}\n\t}\n\n\treturn attrs;\n}\n\n// Parses class attribute and puts all classes into classes set.\n// Classes set s cleared before insertion.\n//\n// @param {Set.<String>} classesSet Set to insert parsed classes.\n// @param {String} classesString String with classes to parse.\nfunction parseClasses( classesSet, classesString ) {\n\tconst classArray = classesString.split( /\\s+/ );\n\tclassesSet.clear();\n\tclassArray.forEach( name => classesSet.add( name ) );\n}\n\n// Converts strings to Text and non-iterables to arrays.\n//\n// @param {String|module:engine/view/item~Item|Iterable.<String|module:engine/view/item~Item>}\n// @returns {Iterable.<module:engine/view/node~Node>}\nfunction normalize( document, nodes ) {\n\t// Separate condition because string is iterable.\n\tif ( typeof nodes == 'string' ) {\n\t\treturn [ new Text( document, nodes ) ];\n\t}\n\n\tif ( !isIterable( nodes ) ) {\n\t\tnodes = [ nodes ];\n\t}\n\n\t// Array.from to enable .map() on non-arrays.\n\treturn Array.from( nodes )\n\t\t.map( node => {\n\t\t\tif ( typeof node == 'string' ) {\n\t\t\t\treturn new Text( document, node );\n\t\t\t}\n\n\t\t\tif ( node instanceof TextProxy ) {\n\t\t\t\treturn new Text( document, node.data );\n\t\t\t}\n\n\t\t\treturn node;\n\t\t} );\n}\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module engine/view/containerelement\n */\n\nimport Element from './element';\n\n/**\n * Containers are elements which define document structure. They define boundaries for\n * {@link module:engine/view/attributeelement~AttributeElement attributes}. They are mostly used for block elements like `<p>` or `<div>`.\n *\n * Editing engine does not define a fixed HTML DTD. This is why a feature developer needs to choose between various\n * types (container element, {@link module:engine/view/attributeelement~AttributeElement attribute element},\n * {@link module:engine/view/emptyelement~EmptyElement empty element}, etc) when developing a feature.\n *\n * The container element should be your default choice when writing a converter, unless:\n *\n * * this element represents a model text attribute (then use {@link module:engine/view/attributeelement~AttributeElement}),\n * * this is an empty element like `<img>` (then use {@link module:engine/view/emptyelement~EmptyElement}),\n * * this is a root element,\n * * this is a nested editable element (then use  {@link module:engine/view/editableelement~EditableElement}).\n *\n * To create a new container element instance use the\n * {@link module:engine/view/downcastwriter~DowncastWriter#createContainerElement `DowncastWriter#createContainerElement()`}\n * method.\n *\n * @extends module:engine/view/element~Element\n */\nexport default class ContainerElement extends Element {\n\t/**\n\t * Creates a container element.\n\t *\n\t * @see module:engine/view/downcastwriter~DowncastWriter#createContainerElement\n\t * @see module:engine/view/element~Element\n\t * @protected\n\t * @param {module:engine/view/document~Document} document The document instance to which this element belongs.\n\t * @param {String} name Node name.\n\t * @param {Object|Iterable} [attrs] Collection of attributes.\n\t * @param {module:engine/view/node~Node|Iterable.<module:engine/view/node~Node>} [children]\n\t * A list of nodes to be inserted into created element.\n\t */\n\tconstructor( document, name, attrs, children ) {\n\t\tsuper( document, name, attrs, children );\n\n\t\t/**\n\t\t * Returns block {@link module:engine/view/filler filler} offset or `null` if block filler is not needed.\n\t\t *\n\t\t * @method #getFillerOffset\n\t\t * @returns {Number|null} Block filler offset or `null` if block filler is not needed.\n\t\t */\n\t\tthis.getFillerOffset = getFillerOffset;\n\t}\n\n\t/**\n\t * Checks whether this object is of the given.\n\t *\n\t *\t\tcontainerElement.is( 'containerElement' ); // -> true\n\t *\t\tcontainerElement.is( 'element' ); // -> true\n\t *\t\tcontainerElement.is( 'node' ); // -> true\n\t *\t\tcontainerElement.is( 'view:containerElement' ); // -> true\n\t *\t\tcontainerElement.is( 'view:element' ); // -> true\n\t *\t\tcontainerElement.is( 'view:node' ); // -> true\n\t *\n\t *\t\tcontainerElement.is( 'model:element' ); // -> false\n\t *\t\tcontainerElement.is( 'documentFragment' ); // -> false\n\t *\n\t * Assuming that the object being checked is a container element, you can also check its\n\t * {@link module:engine/view/containerelement~ContainerElement#name name}:\n\t *\n\t *\t\tcontainerElement.is( 'element', 'div' ); // -> true if this is a div container element\n\t *\t\tcontainerElement.is( 'contaienrElement', 'div' ); // -> same as above\n\t *\t\ttext.is( 'element', 'div' ); -> false\n\t *\n\t * {@link module:engine/view/node~Node#is Check the entire list of view objects} which implement the `is()` method.\n\t *\n\t * @param {String} type Type to check.\n\t * @param {String} [name] Element name.\n\t * @returns {Boolean}\n\t */\n\tis( type, name = null ) {\n\t\tif ( !name ) {\n\t\t\treturn type === 'containerElement' || type === 'view:containerElement' ||\n\t\t\t\t// From super.is(). This is highly utilised method and cannot call super. See ckeditor/ckeditor5#6529.\n\t\t\t\ttype === 'element' || type === 'view:element' ||\n\t\t\t\ttype === 'node' || type === 'view:node';\n\t\t} else {\n\t\t\treturn name === this.name && (\n\t\t\t\ttype === 'containerElement' || type === 'view:containerElement' ||\n\t\t\t\t// From super.is(). This is highly utilised method and cannot call super. See ckeditor/ckeditor5#6529.\n\t\t\t\ttype === 'element' || type === 'view:element'\n\t\t\t);\n\t\t}\n\t}\n}\n\n/**\n * Returns block {@link module:engine/view/filler filler} offset or `null` if block filler is not needed.\n *\n * @returns {Number|null} Block filler offset or `null` if block filler is not needed.\n */\nexport function getFillerOffset() {\n\tconst children = [ ...this.getChildren() ];\n\tconst lastChild = children[ this.childCount - 1 ];\n\n\t// Block filler is required after a `<br>` if it's the last element in its container. See #1422.\n\tif ( lastChild && lastChild.is( 'element', 'br' ) ) {\n\t\treturn this.childCount;\n\t}\n\n\tfor ( const child of children ) {\n\t\t// If there's any non-UI element – don't render the bogus.\n\t\tif ( !child.is( 'uiElement' ) ) {\n\t\t\treturn null;\n\t\t}\n\t}\n\n\t// If there are only UI elements – render the bogus at the end of the element.\n\treturn this.childCount;\n}\n","import copyObject from './_copyObject.js';\nimport createAssigner from './_createAssigner.js';\nimport keysIn from './keysIn.js';\n\n/**\n * This method is like `_.assign` except that it iterates over own and\n * inherited source properties.\n *\n * **Note:** This method mutates `object`.\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @alias extend\n * @category Object\n * @param {Object} object The destination object.\n * @param {...Object} [sources] The source objects.\n * @returns {Object} Returns `object`.\n * @see _.assign\n * @example\n *\n * function Foo() {\n *   this.a = 1;\n * }\n *\n * function Bar() {\n *   this.c = 3;\n * }\n *\n * Foo.prototype.b = 2;\n * Bar.prototype.d = 4;\n *\n * _.assignIn({ 'a': 0 }, new Foo, new Bar);\n * // => { 'a': 1, 'b': 2, 'c': 3, 'd': 4 }\n */\nvar assignIn = createAssigner(function(object, source) {\n  copyObject(source, keysIn(source), object);\n});\n\nexport default assignIn;\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module utils/observablemixin\n */\n\nimport EmitterMixin from './emittermixin';\nimport CKEditorError from './ckeditorerror';\nimport { extend, isObject } from 'lodash-es';\n\nconst observablePropertiesSymbol = Symbol( 'observableProperties' );\nconst boundObservablesSymbol = Symbol( 'boundObservables' );\nconst boundPropertiesSymbol = Symbol( 'boundProperties' );\n\n/**\n * A mixin that injects the \"observable properties\" and data binding functionality described in the\n * {@link ~Observable} interface.\n *\n * Read more about the concept of observables in the:\n * * {@glink framework/guides/architecture/core-editor-architecture#event-system-and-observables \"Event system and observables\"}\n * section of the {@glink framework/guides/architecture/core-editor-architecture \"Core editor architecture\"} guide,\n * * {@glink framework/guides/deep-dive/observables \"Observables\" deep dive} guide.\n *\n * @mixin ObservableMixin\n * @mixes module:utils/emittermixin~EmitterMixin\n * @implements module:utils/observablemixin~Observable\n */\nconst ObservableMixin = {\n\t/**\n\t * @inheritDoc\n\t */\n\tset( name, value ) {\n\t\t// If the first parameter is an Object, iterate over its properties.\n\t\tif ( isObject( name ) ) {\n\t\t\tObject.keys( name ).forEach( property => {\n\t\t\t\tthis.set( property, name[ property ] );\n\t\t\t}, this );\n\n\t\t\treturn;\n\t\t}\n\n\t\tinitObservable( this );\n\n\t\tconst properties = this[ observablePropertiesSymbol ];\n\n\t\tif ( ( name in this ) && !properties.has( name ) ) {\n\t\t\t/**\n\t\t\t * Cannot override an existing property.\n\t\t\t *\n\t\t\t * This error is thrown when trying to {@link ~Observable#set set} a property with\n\t\t\t * a name of an already existing property. For example:\n\t\t\t *\n\t\t\t *\t\tlet observable = new Model();\n\t\t\t *\t\tobservable.property = 1;\n\t\t\t *\t\tobservable.set( 'property', 2 );\t\t\t// throws\n\t\t\t *\n\t\t\t *\t\tobservable.set( 'property', 1 );\n\t\t\t *\t\tobservable.set( 'property', 2 );\t\t\t// ok, because this is an existing property.\n\t\t\t *\n\t\t\t * @error observable-set-cannot-override\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'observable-set-cannot-override', this );\n\t\t}\n\n\t\tObject.defineProperty( this, name, {\n\t\t\tenumerable: true,\n\t\t\tconfigurable: true,\n\n\t\t\tget() {\n\t\t\t\treturn properties.get( name );\n\t\t\t},\n\n\t\t\tset( value ) {\n\t\t\t\tconst oldValue = properties.get( name );\n\n\t\t\t\t// Fire `set` event before the new value will be set to make it possible\n\t\t\t\t// to override observable property without affecting `change` event.\n\t\t\t\t// See https://github.com/ckeditor/ckeditor5-utils/issues/171.\n\t\t\t\tlet newValue = this.fire( 'set:' + name, name, value, oldValue );\n\n\t\t\t\tif ( newValue === undefined ) {\n\t\t\t\t\tnewValue = value;\n\t\t\t\t}\n\n\t\t\t\t// Allow undefined as an initial value like A.define( 'x', undefined ) (#132).\n\t\t\t\t// Note: When properties map has no such own property, then its value is undefined.\n\t\t\t\tif ( oldValue !== newValue || !properties.has( name ) ) {\n\t\t\t\t\tproperties.set( name, newValue );\n\t\t\t\t\tthis.fire( 'change:' + name, name, newValue, oldValue );\n\t\t\t\t}\n\t\t\t}\n\t\t} );\n\n\t\tthis[ name ] = value;\n\t},\n\n\t/**\n\t * @inheritDoc\n\t */\n\tbind( ...bindProperties ) {\n\t\tif ( !bindProperties.length || !isStringArray( bindProperties ) ) {\n\t\t\t/**\n\t\t\t * All properties must be strings.\n\t\t\t *\n\t\t\t * @error observable-bind-wrong-properties\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'observable-bind-wrong-properties', this );\n\t\t}\n\n\t\tif ( ( new Set( bindProperties ) ).size !== bindProperties.length ) {\n\t\t\t/**\n\t\t\t * Properties must be unique.\n\t\t\t *\n\t\t\t * @error observable-bind-duplicate-properties\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'observable-bind-duplicate-properties', this );\n\t\t}\n\n\t\tinitObservable( this );\n\n\t\tconst boundProperties = this[ boundPropertiesSymbol ];\n\n\t\tbindProperties.forEach( propertyName => {\n\t\t\tif ( boundProperties.has( propertyName ) ) {\n\t\t\t\t/**\n\t\t\t\t * Cannot bind the same property more than once.\n\t\t\t\t *\n\t\t\t\t * @error observable-bind-rebind\n\t\t\t\t */\n\t\t\t\tthrow new CKEditorError( 'observable-bind-rebind', this );\n\t\t\t}\n\t\t} );\n\n\t\tconst bindings = new Map();\n\n\t\t// @typedef {Object} Binding\n\t\t// @property {Array} property Property which is bound.\n\t\t// @property {Array} to Array of observable–property components of the binding (`{ observable: ..., property: .. }`).\n\t\t// @property {Array} callback A function which processes `to` components.\n\t\tbindProperties.forEach( a => {\n\t\t\tconst binding = { property: a, to: [] };\n\n\t\t\tboundProperties.set( a, binding );\n\t\t\tbindings.set( a, binding );\n\t\t} );\n\n\t\t// @typedef {Object} BindChain\n\t\t// @property {Function} to See {@link ~ObservableMixin#_bindTo}.\n\t\t// @property {Function} toMany See {@link ~ObservableMixin#_bindToMany}.\n\t\t// @property {module:utils/observablemixin~Observable} _observable The observable which initializes the binding.\n\t\t// @property {Array} _bindProperties Array of `_observable` properties to be bound.\n\t\t// @property {Array} _to Array of `to()` observable–properties (`{ observable: toObservable, properties: ...toProperties }`).\n\t\t// @property {Map} _bindings Stores bindings to be kept in\n\t\t// {@link ~ObservableMixin#_boundProperties}/{@link ~ObservableMixin#_boundObservables}\n\t\t// initiated in this binding chain.\n\t\treturn {\n\t\t\tto: bindTo,\n\t\t\ttoMany: bindToMany,\n\n\t\t\t_observable: this,\n\t\t\t_bindProperties: bindProperties,\n\t\t\t_to: [],\n\t\t\t_bindings: bindings\n\t\t};\n\t},\n\n\t/**\n\t * @inheritDoc\n\t */\n\tunbind( ...unbindProperties ) {\n\t\t// Nothing to do here if not inited yet.\n\t\tif ( !( this[ observablePropertiesSymbol ] ) ) {\n\t\t\treturn;\n\t\t}\n\n\t\tconst boundProperties = this[ boundPropertiesSymbol ];\n\t\tconst boundObservables = this[ boundObservablesSymbol ];\n\n\t\tif ( unbindProperties.length ) {\n\t\t\tif ( !isStringArray( unbindProperties ) ) {\n\t\t\t\t/**\n\t\t\t\t * Properties must be strings.\n\t\t\t\t *\n\t\t\t\t * @error observable-unbind-wrong-properties\n\t\t\t\t */\n\t\t\t\tthrow new CKEditorError( 'observable-unbind-wrong-properties', this );\n\t\t\t}\n\n\t\t\tunbindProperties.forEach( propertyName => {\n\t\t\t\tconst binding = boundProperties.get( propertyName );\n\n\t\t\t\t// Nothing to do if the binding is not defined\n\t\t\t\tif ( !binding ) {\n\t\t\t\t\treturn;\n\t\t\t\t}\n\n\t\t\t\tlet toObservable, toProperty, toProperties, toPropertyBindings;\n\n\t\t\t\tbinding.to.forEach( to => {\n\t\t\t\t\t// TODO: ES6 destructuring.\n\t\t\t\t\ttoObservable = to[ 0 ];\n\t\t\t\t\ttoProperty = to[ 1 ];\n\t\t\t\t\ttoProperties = boundObservables.get( toObservable );\n\t\t\t\t\ttoPropertyBindings = toProperties[ toProperty ];\n\n\t\t\t\t\ttoPropertyBindings.delete( binding );\n\n\t\t\t\t\tif ( !toPropertyBindings.size ) {\n\t\t\t\t\t\tdelete toProperties[ toProperty ];\n\t\t\t\t\t}\n\n\t\t\t\t\tif ( !Object.keys( toProperties ).length ) {\n\t\t\t\t\t\tboundObservables.delete( toObservable );\n\t\t\t\t\t\tthis.stopListening( toObservable, 'change' );\n\t\t\t\t\t}\n\t\t\t\t} );\n\n\t\t\t\tboundProperties.delete( propertyName );\n\t\t\t} );\n\t\t} else {\n\t\t\tboundObservables.forEach( ( bindings, boundObservable ) => {\n\t\t\t\tthis.stopListening( boundObservable, 'change' );\n\t\t\t} );\n\n\t\t\tboundObservables.clear();\n\t\t\tboundProperties.clear();\n\t\t}\n\t},\n\n\t/**\n\t * @inheritDoc\n\t */\n\tdecorate( methodName ) {\n\t\tconst originalMethod = this[ methodName ];\n\n\t\tif ( !originalMethod ) {\n\t\t\t/**\n\t\t\t * Cannot decorate an undefined method.\n\t\t\t *\n\t\t\t * @error observablemixin-cannot-decorate-undefined\n\t\t\t * @param {Object} object The object which method should be decorated.\n\t\t\t * @param {String} methodName Name of the method which does not exist.\n\t\t\t */\n\t\t\tthrow new CKEditorError(\n\t\t\t\t'observablemixin-cannot-decorate-undefined',\n\t\t\t\tthis,\n\t\t\t\t{ object: this, methodName }\n\t\t\t);\n\t\t}\n\n\t\tthis.on( methodName, ( evt, args ) => {\n\t\t\tevt.return = originalMethod.apply( this, args );\n\t\t} );\n\n\t\tthis[ methodName ] = function( ...args ) {\n\t\t\treturn this.fire( methodName, args );\n\t\t};\n\t}\n};\n\nextend( ObservableMixin, EmitterMixin );\n\nexport default ObservableMixin;\n\n// Init symbol properties needed for the observable mechanism to work.\n//\n// @private\n// @param {module:utils/observablemixin~ObservableMixin} observable\nfunction initObservable( observable ) {\n\t// Do nothing if already inited.\n\tif ( observable[ observablePropertiesSymbol ] ) {\n\t\treturn;\n\t}\n\n\t// The internal hash containing the observable's state.\n\t//\n\t// @private\n\t// @type {Map}\n\tObject.defineProperty( observable, observablePropertiesSymbol, {\n\t\tvalue: new Map()\n\t} );\n\n\t// Map containing bindings to external observables. It shares the binding objects\n\t// (`{ observable: A, property: 'a', to: ... }`) with {@link module:utils/observablemixin~ObservableMixin#_boundProperties} and\n\t// it is used to observe external observables to update own properties accordingly.\n\t// See {@link module:utils/observablemixin~ObservableMixin#bind}.\n\t//\n\t//\t\tA.bind( 'a', 'b', 'c' ).to( B, 'x', 'y', 'x' );\n\t//\t\tconsole.log( A._boundObservables );\n\t//\n\t//\t\t\tMap( {\n\t//\t\t\t\tB: {\n\t//\t\t\t\t\tx: Set( [\n\t//\t\t\t\t\t\t{ observable: A, property: 'a', to: [ [ B, 'x' ] ] },\n\t//\t\t\t\t\t\t{ observable: A, property: 'c', to: [ [ B, 'x' ] ] }\n\t//\t\t\t\t\t] ),\n\t//\t\t\t\t\ty: Set( [\n\t//\t\t\t\t\t\t{ observable: A, property: 'b', to: [ [ B, 'y' ] ] },\n\t//\t\t\t\t\t] )\n\t//\t\t\t\t}\n\t//\t\t\t} )\n\t//\n\t//\t\tA.bind( 'd' ).to( B, 'z' ).to( C, 'w' ).as( callback );\n\t//\t\tconsole.log( A._boundObservables );\n\t//\n\t//\t\t\tMap( {\n\t//\t\t\t\tB: {\n\t//\t\t\t\t\tx: Set( [\n\t//\t\t\t\t\t\t{ observable: A, property: 'a', to: [ [ B, 'x' ] ] },\n\t//\t\t\t\t\t\t{ observable: A, property: 'c', to: [ [ B, 'x' ] ] }\n\t//\t\t\t\t\t] ),\n\t//\t\t\t\t\ty: Set( [\n\t//\t\t\t\t\t\t{ observable: A, property: 'b', to: [ [ B, 'y' ] ] },\n\t//\t\t\t\t\t] ),\n\t//\t\t\t\t\tz: Set( [\n\t//\t\t\t\t\t\t{ observable: A, property: 'd', to: [ [ B, 'z' ], [ C, 'w' ] ], callback: callback }\n\t//\t\t\t\t\t] )\n\t//\t\t\t\t},\n\t//\t\t\t\tC: {\n\t//\t\t\t\t\tw: Set( [\n\t//\t\t\t\t\t\t{ observable: A, property: 'd', to: [ [ B, 'z' ], [ C, 'w' ] ], callback: callback }\n\t//\t\t\t\t\t] )\n\t//\t\t\t\t}\n\t//\t\t\t} )\n\t//\n\t// @private\n\t// @type {Map}\n\tObject.defineProperty( observable, boundObservablesSymbol, {\n\t\tvalue: new Map()\n\t} );\n\n\t// Object that stores which properties of this observable are bound and how. It shares\n\t// the binding objects (`{ observable: A, property: 'a', to: ... }`) with\n\t// {@link module:utils/observablemixin~ObservableMixin#_boundObservables}. This data structure is\n\t// a reverse of {@link module:utils/observablemixin~ObservableMixin#_boundObservables} and it is helpful for\n\t// {@link module:utils/observablemixin~ObservableMixin#unbind}.\n\t//\n\t// See {@link module:utils/observablemixin~ObservableMixin#bind}.\n\t//\n\t//\t\tA.bind( 'a', 'b', 'c' ).to( B, 'x', 'y', 'x' );\n\t//\t\tconsole.log( A._boundProperties );\n\t//\n\t//\t\t\tMap( {\n\t//\t\t\t\ta: { observable: A, property: 'a', to: [ [ B, 'x' ] ] },\n\t//\t\t\t\tb: { observable: A, property: 'b', to: [ [ B, 'y' ] ] },\n\t//\t\t\t\tc: { observable: A, property: 'c', to: [ [ B, 'x' ] ] }\n\t//\t\t\t} )\n\t//\n\t//\t\tA.bind( 'd' ).to( B, 'z' ).to( C, 'w' ).as( callback );\n\t//\t\tconsole.log( A._boundProperties );\n\t//\n\t//\t\t\tMap( {\n\t//\t\t\t\ta: { observable: A, property: 'a', to: [ [ B, 'x' ] ] },\n\t//\t\t\t\tb: { observable: A, property: 'b', to: [ [ B, 'y' ] ] },\n\t//\t\t\t\tc: { observable: A, property: 'c', to: [ [ B, 'x' ] ] },\n\t//\t\t\t\td: { observable: A, property: 'd', to: [ [ B, 'z' ], [ C, 'w' ] ], callback: callback }\n\t//\t\t\t} )\n\t//\n\t// @private\n\t// @type {Map}\n\tObject.defineProperty( observable, boundPropertiesSymbol, {\n\t\tvalue: new Map()\n\t} );\n}\n\n// A chaining for {@link module:utils/observablemixin~ObservableMixin#bind} providing `.to()` interface.\n//\n// @private\n// @param {...[Observable|String|Function]} args Arguments of the `.to( args )` binding.\nfunction bindTo( ...args ) {\n\tconst parsedArgs = parseBindToArgs( ...args );\n\tconst bindingsKeys = Array.from( this._bindings.keys() );\n\tconst numberOfBindings = bindingsKeys.length;\n\n\t// Eliminate A.bind( 'x' ).to( B, C )\n\tif ( !parsedArgs.callback && parsedArgs.to.length > 1 ) {\n\t\t/**\n\t\t * Binding multiple observables only possible with callback.\n\t\t *\n\t\t * @error observable-bind-to-no-callback\n\t\t */\n\t\tthrow new CKEditorError( 'observable-bind-to-no-callback', this );\n\t}\n\n\t// Eliminate A.bind( 'x', 'y' ).to( B, callback )\n\tif ( numberOfBindings > 1 && parsedArgs.callback ) {\n\t\t/**\n\t\t * Cannot bind multiple properties and use a callback in one binding.\n\t\t *\n\t\t * @error observable-bind-to-extra-callback\n\t\t */\n\t\tthrow new CKEditorError(\n\t\t\t'observable-bind-to-extra-callback',\n\t\t\tthis\n\t\t);\n\t}\n\n\tparsedArgs.to.forEach( to => {\n\t\t// Eliminate A.bind( 'x', 'y' ).to( B, 'a' )\n\t\tif ( to.properties.length && to.properties.length !== numberOfBindings ) {\n\t\t\t/**\n\t\t\t * The number of properties must match.\n\t\t\t *\n\t\t\t * @error observable-bind-to-properties-length\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'observable-bind-to-properties-length', this );\n\t\t}\n\n\t\t// When no to.properties specified, observing source properties instead i.e.\n\t\t// A.bind( 'x', 'y' ).to( B ) -> Observe B.x and B.y\n\t\tif ( !to.properties.length ) {\n\t\t\tto.properties = this._bindProperties;\n\t\t}\n\t} );\n\n\tthis._to = parsedArgs.to;\n\n\t// Fill {@link BindChain#_bindings} with callback. When the callback is set there's only one binding.\n\tif ( parsedArgs.callback ) {\n\t\tthis._bindings.get( bindingsKeys[ 0 ] ).callback = parsedArgs.callback;\n\t}\n\n\tattachBindToListeners( this._observable, this._to );\n\n\t// Update observable._boundProperties and observable._boundObservables.\n\tupdateBindToBound( this );\n\n\t// Set initial values of bound properties.\n\tthis._bindProperties.forEach( propertyName => {\n\t\tupdateBoundObservableProperty( this._observable, propertyName );\n\t} );\n}\n\n// Binds to an attribute in a set of iterable observables.\n//\n// @private\n// @param {Array.<Observable>} observables\n// @param {String} attribute\n// @param {Function} callback\nfunction bindToMany( observables, attribute, callback ) {\n\tif ( this._bindings.size > 1 ) {\n\t\t/**\n\t\t * Binding one attribute to many observables only possible with one attribute.\n\t\t *\n\t\t * @error observable-bind-to-many-not-one-binding\n\t\t */\n\t\tthrow new CKEditorError( 'observable-bind-to-many-not-one-binding', this );\n\t}\n\n\tthis.to(\n\t\t// Bind to #attribute of each observable...\n\t\t...getBindingTargets( observables, attribute ),\n\t\t// ...using given callback to parse attribute values.\n\t\tcallback\n\t);\n}\n\n// Returns an array of binding components for\n// {@link Observable#bind} from a set of iterable observables.\n//\n// @param {Array.<Observable>} observables\n// @param {String} attribute\n// @returns {Array.<String|Observable>}\nfunction getBindingTargets( observables, attribute ) {\n\tconst observableAndAttributePairs = observables.map( observable => [ observable, attribute ] );\n\n\t// Merge pairs to one-dimension array of observables and attributes.\n\treturn Array.prototype.concat.apply( [], observableAndAttributePairs );\n}\n\n// Check if all entries of the array are of `String` type.\n//\n// @private\n// @param {Array} arr An array to be checked.\n// @returns {Boolean}\nfunction isStringArray( arr ) {\n\treturn arr.every( a => typeof a == 'string' );\n}\n\n// Parses and validates {@link Observable#bind}`.to( args )` arguments and returns\n// an object with a parsed structure. For example\n//\n//\t\tA.bind( 'x' ).to( B, 'a', C, 'b', call );\n//\n// becomes\n//\n//\t\t{\n//\t\t\tto: [\n//\t\t\t\t{ observable: B, properties: [ 'a' ] },\n//\t\t\t\t{ observable: C, properties: [ 'b' ] },\n//\t\t\t],\n//\t\t\tcallback: call\n// \t\t}\n//\n// @private\n// @param {...*} args Arguments of {@link Observable#bind}`.to( args )`.\n// @returns {Object}\nfunction parseBindToArgs( ...args ) {\n\t// Eliminate A.bind( 'x' ).to()\n\tif ( !args.length ) {\n\t\t/**\n\t\t * Invalid argument syntax in `to()`.\n\t\t *\n\t\t * @error observable-bind-to-parse-error\n\t\t */\n\t\tthrow new CKEditorError( 'observable-bind-to-parse-error', null );\n\t}\n\n\tconst parsed = { to: [] };\n\tlet lastObservable;\n\n\tif ( typeof args[ args.length - 1 ] == 'function' ) {\n\t\tparsed.callback = args.pop();\n\t}\n\n\targs.forEach( a => {\n\t\tif ( typeof a == 'string' ) {\n\t\t\tlastObservable.properties.push( a );\n\t\t} else if ( typeof a == 'object' ) {\n\t\t\tlastObservable = { observable: a, properties: [] };\n\t\t\tparsed.to.push( lastObservable );\n\t\t} else {\n\t\t\tthrow new CKEditorError( 'observable-bind-to-parse-error', null );\n\t\t}\n\t} );\n\n\treturn parsed;\n}\n\n// Synchronizes {@link module:utils/observablemixin#_boundObservables} with {@link Binding}.\n//\n// @private\n// @param {Binding} binding A binding to store in {@link Observable#_boundObservables}.\n// @param {Observable} toObservable A observable, which is a new component of `binding`.\n// @param {String} toPropertyName A name of `toObservable`'s property, a new component of the `binding`.\nfunction updateBoundObservables( observable, binding, toObservable, toPropertyName ) {\n\tconst boundObservables = observable[ boundObservablesSymbol ];\n\tconst bindingsToObservable = boundObservables.get( toObservable );\n\tconst bindings = bindingsToObservable || {};\n\n\tif ( !bindings[ toPropertyName ] ) {\n\t\tbindings[ toPropertyName ] = new Set();\n\t}\n\n\t// Pass the binding to a corresponding Set in `observable._boundObservables`.\n\tbindings[ toPropertyName ].add( binding );\n\n\tif ( !bindingsToObservable ) {\n\t\tboundObservables.set( toObservable, bindings );\n\t}\n}\n\n// Synchronizes {@link Observable#_boundProperties} and {@link Observable#_boundObservables}\n// with {@link BindChain}.\n//\n// Assuming the following binding being created\n//\n// \t\tA.bind( 'a', 'b' ).to( B, 'x', 'y' );\n//\n// the following bindings were initialized by {@link Observable#bind} in {@link BindChain#_bindings}:\n//\n// \t\t{\n// \t\t\ta: { observable: A, property: 'a', to: [] },\n// \t\t\tb: { observable: A, property: 'b', to: [] },\n// \t\t}\n//\n// Iterate over all bindings in this chain and fill their `to` properties with\n// corresponding to( ... ) arguments (components of the binding), so\n//\n// \t\t{\n// \t\t\ta: { observable: A, property: 'a', to: [ B, 'x' ] },\n// \t\t\tb: { observable: A, property: 'b', to: [ B, 'y' ] },\n// \t\t}\n//\n// Then update the structure of {@link Observable#_boundObservables} with updated\n// binding, so it becomes:\n//\n// \t\tMap( {\n// \t\t\tB: {\n// \t\t\t\tx: Set( [\n// \t\t\t\t\t{ observable: A, property: 'a', to: [ [ B, 'x' ] ] }\n// \t\t\t\t] ),\n// \t\t\t\ty: Set( [\n// \t\t\t\t\t{ observable: A, property: 'b', to: [ [ B, 'y' ] ] },\n// \t\t\t\t] )\n//\t\t\t}\n// \t\t} )\n//\n// @private\n// @param {BindChain} chain The binding initialized by {@link Observable#bind}.\nfunction updateBindToBound( chain ) {\n\tlet toProperty;\n\n\tchain._bindings.forEach( ( binding, propertyName ) => {\n\t\t// Note: For a binding without a callback, this will run only once\n\t\t// like in A.bind( 'x', 'y' ).to( B, 'a', 'b' )\n\t\t// TODO: ES6 destructuring.\n\t\tchain._to.forEach( to => {\n\t\t\ttoProperty = to.properties[ binding.callback ? 0 : chain._bindProperties.indexOf( propertyName ) ];\n\n\t\t\tbinding.to.push( [ to.observable, toProperty ] );\n\t\t\tupdateBoundObservables( chain._observable, binding, to.observable, toProperty );\n\t\t} );\n\t} );\n}\n\n// Updates an property of a {@link Observable} with a value\n// determined by an entry in {@link Observable#_boundProperties}.\n//\n// @private\n// @param {Observable} observable A observable which property is to be updated.\n// @param {String} propertyName An property to be updated.\nfunction updateBoundObservableProperty( observable, propertyName ) {\n\tconst boundProperties = observable[ boundPropertiesSymbol ];\n\tconst binding = boundProperties.get( propertyName );\n\tlet propertyValue;\n\n\t// When a binding with callback is created like\n\t//\n\t// \t\tA.bind( 'a' ).to( B, 'b', C, 'c', callback );\n\t//\n\t// collect B.b and C.c, then pass them to callback to set A.a.\n\tif ( binding.callback ) {\n\t\tpropertyValue = binding.callback.apply( observable, binding.to.map( to => to[ 0 ][ to[ 1 ] ] ) );\n\t} else {\n\t\tpropertyValue = binding.to[ 0 ];\n\t\tpropertyValue = propertyValue[ 0 ][ propertyValue[ 1 ] ];\n\t}\n\n\tif ( Object.prototype.hasOwnProperty.call( observable, propertyName ) ) {\n\t\tobservable[ propertyName ] = propertyValue;\n\t} else {\n\t\tobservable.set( propertyName, propertyValue );\n\t}\n}\n\n// Starts listening to changes in {@link BindChain._to} observables to update\n// {@link BindChain._observable} {@link BindChain._bindProperties}. Also sets the\n// initial state of {@link BindChain._observable}.\n//\n// @private\n// @param {BindChain} chain The chain initialized by {@link Observable#bind}.\nfunction attachBindToListeners( observable, toBindings ) {\n\ttoBindings.forEach( to => {\n\t\tconst boundObservables = observable[ boundObservablesSymbol ];\n\t\tlet bindings;\n\n\t\t// If there's already a chain between the observables (`observable` listens to\n\t\t// `to.observable`), there's no need to create another `change` event listener.\n\t\tif ( !boundObservables.get( to.observable ) ) {\n\t\t\tobservable.listenTo( to.observable, 'change', ( evt, propertyName ) => {\n\t\t\t\tbindings = boundObservables.get( to.observable )[ propertyName ];\n\n\t\t\t\t// Note: to.observable will fire for any property change, react\n\t\t\t\t// to changes of properties which are bound only.\n\t\t\t\tif ( bindings ) {\n\t\t\t\t\tbindings.forEach( binding => {\n\t\t\t\t\t\tupdateBoundObservableProperty( observable, binding.property );\n\t\t\t\t\t} );\n\t\t\t\t}\n\t\t\t} );\n\t\t}\n\t} );\n}\n\n/**\n * An interface which adds \"observable properties\" and data binding functionality.\n *\n * Can be easily implemented by a class by mixing the {@link module:utils/observablemixin~ObservableMixin} mixin.\n *\n * Read more about the usage of this interface in the:\n * * {@glink framework/guides/architecture/core-editor-architecture#event-system-and-observables \"Event system and observables\"}\n * section of the {@glink framework/guides/architecture/core-editor-architecture \"Core editor architecture\"} guide,\n * * {@glink framework/guides/deep-dive/observables \"Observables\" deep dive} guide.\n *\n * @interface Observable\n * @extends module:utils/emittermixin~Emitter\n */\n\n/**\n * Fired when a property changed value.\n *\n *\t\tobservable.set( 'prop', 1 );\n *\n *\t\tobservable.on( 'change:prop', ( evt, propertyName, newValue, oldValue ) => {\n *\t\t\tconsole.log( `${ propertyName } has changed from ${ oldValue } to ${ newValue }` );\n *\t\t} );\n *\n *\t\tobservable.prop = 2; // -> 'prop has changed from 1 to 2'\n *\n * @event change:{property}\n * @param {String} name The property name.\n * @param {*} value The new property value.\n * @param {*} oldValue The previous property value.\n */\n\n/**\n * Fired when a property value is going to be set but is not set yet (before the `change` event is fired).\n *\n * You can control the final value of the property by using\n * the {@link module:utils/eventinfo~EventInfo#return event's `return` property}.\n *\n *\t\tobservable.set( 'prop', 1 );\n *\n *\t\tobservable.on( 'set:prop', ( evt, propertyName, newValue, oldValue ) => {\n *\t\t\tconsole.log( `Value is going to be changed from ${ oldValue } to ${ newValue }` );\n *\t\t\tconsole.log( `Current property value is ${ observable[ propertyName ] }` );\n *\n *\t\t\t// Let's override the value.\n *\t\t\tevt.return = 3;\n *\t\t} );\n *\n *\t\tobservable.on( 'change:prop', ( evt, propertyName, newValue, oldValue ) => {\n *\t\t\tconsole.log( `Value has changed from ${ oldValue } to ${ newValue }` );\n *\t\t} );\n *\n *\t\tobservable.prop = 2; // -> 'Value is going to be changed from 1 to 2'\n *\t\t                     // -> 'Current property value is 1'\n *\t\t                     // -> 'Value has changed from 1 to 3'\n *\n * **Note:** The event is fired even when the new value is the same as the old value.\n *\n * @event set:{property}\n * @param {String} name The property name.\n * @param {*} value The new property value.\n * @param {*} oldValue The previous property value.\n */\n\n/**\n * Creates and sets the value of an observable property of this object. Such a property becomes a part\n * of the state and is observable.\n *\n * It accepts also a single object literal containing key/value pairs with properties to be set.\n *\n * This method throws the `observable-set-cannot-override` error if the observable instance already\n * has a property with the given property name. This prevents from mistakenly overriding existing\n * properties and methods, but means that `foo.set( 'bar', 1 )` may be slightly slower than `foo.bar = 1`.\n *\n * @method #set\n * @param {String|Object} name The property's name or object with `name=>value` pairs.\n * @param {*} [value] The property's value (if `name` was passed in the first parameter).\n */\n\n/**\n * Binds {@link #set observable properties} to other objects implementing the\n * {@link module:utils/observablemixin~Observable} interface.\n *\n * Read more in the {@glink framework/guides/deep-dive/observables#property-bindings dedicated guide}\n * covering the topic of property bindings with some additional examples.\n *\n * Consider two objects: a `button` and an associated `command` (both `Observable`).\n *\n * A simple property binding could be as follows:\n *\n *\t\tbutton.bind( 'isEnabled' ).to( command, 'isEnabled' );\n *\n * or even shorter:\n *\n *\t\tbutton.bind( 'isEnabled' ).to( command );\n *\n * which works in the following way:\n *\n * * `button.isEnabled` **instantly equals** `command.isEnabled`,\n * * whenever `command.isEnabled` changes, `button.isEnabled` will immediately reflect its value.\n *\n * **Note**: To release the binding, use {@link module:utils/observablemixin~Observable#unbind}.\n *\n * You can also \"rename\" the property in the binding by specifying the new name in the `to()` chain:\n *\n *\t\tbutton.bind( 'isEnabled' ).to( command, 'isWorking' );\n *\n * It is possible to bind more than one property at a time to shorten the code:\n *\n *\t\tbutton.bind( 'isEnabled', 'value' ).to( command );\n *\n * which corresponds to:\n *\n *\t\tbutton.bind( 'isEnabled' ).to( command );\n *\t\tbutton.bind( 'value' ).to( command );\n *\n * The binding can include more than one observable, combining multiple data sources in a custom callback:\n *\n *\t\tbutton.bind( 'isEnabled' ).to( command, 'isEnabled', ui, 'isVisible',\n *\t\t\t( isCommandEnabled, isUIVisible ) => isCommandEnabled && isUIVisible );\n *\n * Using a custom callback allows processing the value before passing it to the target property:\n *\n *\t\tbutton.bind( 'isEnabled' ).to( command, 'value', value => value === 'heading1' );\n *\n * It is also possible to bind to the same property in an array of observables.\n * To bind a `button` to multiple commands (also `Observables`) so that each and every one of them\n * must be enabled for the button to become enabled, use the following code:\n *\n *\t\tbutton.bind( 'isEnabled' ).toMany( [ commandA, commandB, commandC ], 'isEnabled',\n *\t\t\t( isAEnabled, isBEnabled, isCEnabled ) => isAEnabled && isBEnabled && isCEnabled );\n *\n * @method #bind\n * @param {...String} bindProperties Observable properties that will be bound to other observable(s).\n * @returns {Object} The bind chain with the `to()` and `toMany()` methods.\n */\n\n/**\n * Removes the binding created with {@link #bind}.\n *\n *\t\t// Removes the binding for the 'a' property.\n *\t\tA.unbind( 'a' );\n *\n *\t\t// Removes bindings for all properties.\n *\t\tA.unbind();\n *\n * @method #unbind\n * @param {...String} [unbindProperties] Observable properties to be unbound. All the bindings will\n * be released if no properties are provided.\n */\n\n/**\n * Turns the given methods of this object into event-based ones. This means that the new method will fire an event\n * (named after the method) and the original action will be plugged as a listener to that event.\n *\n * Read more in the {@glink framework/guides/deep-dive/observables#decorating-object-methods dedicated guide}\n * covering the topic of decorating methods with some additional examples.\n *\n * Decorating the method does not change its behavior (it only adds an event),\n * but it allows to modify it later on by listening to the method's event.\n *\n * For example, to cancel the method execution the event can be {@link module:utils/eventinfo~EventInfo#stop stopped}:\n *\n *\t\tclass Foo {\n *\t\t\tconstructor() {\n *\t\t\t\tthis.decorate( 'method' );\n *\t\t\t}\n *\n *\t\t\tmethod() {\n *\t\t\t\tconsole.log( 'called!' );\n *\t\t\t}\n *\t\t}\n *\n *\t\tconst foo = new Foo();\n *\t\tfoo.on( 'method', ( evt ) => {\n *\t\t\tevt.stop();\n *\t\t}, { priority: 'high' } );\n *\n *\t\tfoo.method(); // Nothing is logged.\n *\n *\n * **Note**: The high {@link module:utils/priorities~PriorityString priority} listener\n * has been used to execute this particular callback before the one which calls the original method\n * (which uses the \"normal\" priority).\n *\n * It is also possible to change the returned value:\n *\n *\t\tfoo.on( 'method', ( evt ) => {\n *\t\t\tevt.return = 'Foo!';\n *\t\t} );\n *\n *\t\tfoo.method(); // -> 'Foo'\n *\n * Finally, it is possible to access and modify the arguments the method is called with:\n *\n *\t\tmethod( a, b ) {\n *\t\t\tconsole.log( `${ a }, ${ b }`  );\n *\t\t}\n *\n *\t\t// ...\n *\n *\t\tfoo.on( 'method', ( evt, args ) => {\n *\t\t\targs[ 0 ] = 3;\n *\n *\t\t\tconsole.log( args[ 1 ] ); // -> 2\n *\t\t}, { priority: 'high' } );\n *\n *\t\tfoo.method( 1, 2 ); // -> '3, 2'\n *\n * @method #decorate\n * @param {String} methodName Name of the method to decorate.\n */\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module engine/view/editableelement\n */\n\nimport ContainerElement from './containerelement';\nimport mix from '@ckeditor/ckeditor5-utils/src/mix';\nimport ObservableMixin from '@ckeditor/ckeditor5-utils/src/observablemixin';\n\n/**\n * Editable element which can be a {@link module:engine/view/rooteditableelement~RootEditableElement root}\n * or nested editable area in the editor.\n *\n * Editable is automatically read-only when its {@link module:engine/view/document~Document Document} is read-only.\n *\n * The constructor of this class shouldn't be used directly. To create new `EditableElement` use the\n * {@link module:engine/view/downcastwriter~DowncastWriter#createEditableElement `downcastWriter#createEditableElement()`} method.\n *\n * @extends module:engine/view/containerelement~ContainerElement\n * @mixes module:utils/observablemixin~ObservableMixin\n */\nexport default class EditableElement extends ContainerElement {\n\t/**\n\t * Creates an editable element.\n\t *\n\t * @see module:engine/view/downcastwriter~DowncastWriter#createEditableElement\n\t * @protected\n\t */\n\tconstructor( document, name, attrs, children ) {\n\t\tsuper( document, name, attrs, children );\n\n\t\t/**\n\t\t * Whether the editable is in read-write or read-only mode.\n\t\t *\n\t\t * @observable\n\t\t * @member {Boolean} module:engine/view/editableelement~EditableElement#isReadOnly\n\t\t */\n\t\tthis.set( 'isReadOnly', false );\n\n\t\t/**\n\t\t * Whether the editable is focused.\n\t\t *\n\t\t * This property updates when {@link module:engine/view/document~Document#isFocused document.isFocused} or view\n\t\t * selection is changed.\n\t\t *\n\t\t * @readonly\n\t\t * @observable\n\t\t * @member {Boolean} module:engine/view/editableelement~EditableElement#isFocused\n\t\t */\n\t\tthis.set( 'isFocused', false );\n\n\t\tthis.bind( 'isReadOnly' ).to( document );\n\n\t\tthis.bind( 'isFocused' ).to(\n\t\t\tdocument,\n\t\t\t'isFocused',\n\t\t\tisFocused => isFocused && document.selection.editableElement == this\n\t\t);\n\n\t\t// Update focus state based on selection changes.\n\t\tthis.listenTo( document.selection, 'change', () => {\n\t\t\tthis.isFocused = document.isFocused && document.selection.editableElement == this;\n\t\t} );\n\t}\n\n\t/**\n\t * Checks whether this object is of the given.\n\t *\n\t *\t\teditableElement.is( 'editableElement' ); // -> true\n\t *\t\teditableElement.is( 'element' ); // -> true\n\t *\t\teditableElement.is( 'node' ); // -> true\n\t *\t\teditableElement.is( 'view:editableElement' ); // -> true\n\t *\t\teditableElement.is( 'view:element' ); // -> true\n\t *\t\teditableElement.is( 'view:node' ); // -> true\n\t *\n\t *\t\teditableElement.is( 'model:element' ); // -> false\n\t *\t\teditableElement.is( 'documentFragment' ); // -> false\n\t *\n\t * Assuming that the object being checked is an editbale element, you can also check its\n\t * {@link module:engine/view/editableelement~EditableElement#name name}:\n\t *\n\t *\t\teditableElement.is( 'element', 'div' ); // -> true if this is a div element\n\t *\t\teditableElement.is( 'editableElement', 'div' ); // -> same as above\n\t *\t\ttext.is( 'element', 'div' ); -> false\n\t *\n\t * {@link module:engine/view/node~Node#is Check the entire list of view objects} which implement the `is()` method.\n\t *\n\t * @param {String} type Type to check.\n\t * @param {String} [name] Element name.\n\t * @returns {Boolean}\n\t */\n\tis( type, name = null ) {\n\t\tif ( !name ) {\n\t\t\treturn type === 'editableElement' || type === 'view:editableElement' ||\n\t\t\t\t// From super.is(). This is highly utilised method and cannot call super. See ckeditor/ckeditor5#6529.\n\t\t\t\ttype === 'containerElement' || type === 'view:containerElement' ||\n\t\t\t\ttype === 'element' || type === 'view:element' ||\n\t\t\t\ttype === 'node' || type === 'view:node';\n\t\t} else {\n\t\t\treturn name === this.name && (\n\t\t\t\ttype === 'editableElement' || type === 'view:editableElement' ||\n\t\t\t\t// From super.is(). This is highly utilised method and cannot call super. See ckeditor/ckeditor5#6529.\n\t\t\t\ttype === 'containerElement' || type === 'view:containerElement' ||\n\t\t\t\ttype === 'element' || type === 'view:element'\n\t\t\t);\n\t\t}\n\t}\n\n\tdestroy() {\n\t\tthis.stopListening();\n\t}\n}\n\nmix( EditableElement, ObservableMixin );\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module engine/view/rooteditableelement\n */\n\nimport EditableElement from './editableelement';\n\nconst rootNameSymbol = Symbol( 'rootName' );\n\n/**\n * Class representing a single root in the data view. A root can be either {@link ~RootEditableElement#isReadOnly editable or read-only},\n * but in both cases it is called \"an editable\". Roots can contain other {@link module:engine/view/editableelement~EditableElement\n * editable elements} making them \"nested editables\".\n *\n * @extends module:engine/view/editableelement~EditableElement\n */\nexport default class RootEditableElement extends EditableElement {\n\t/**\n\t * Creates root editable element.\n\t *\n\t * @param {module:engine/view/document~Document} document The document instance to which this element belongs.\n\t * @param {String} name Node name.\n\t */\n\tconstructor( document, name ) {\n\t\tsuper( document, name );\n\n\t\t/**\n\t\t * Name of this root inside {@link module:engine/view/document~Document} that is an owner of this root. If no\n\t\t * other name is set, `main` name is used.\n\t\t *\n\t\t * @readonly\n\t\t * @member {String}\n\t\t */\n\t\tthis.rootName = 'main';\n\t}\n\n\t/**\n\t * Checks whether this object is of the given.\n\t *\n\t *\t\trootEditableElement.is( 'rootElement' ); // -> true\n\t *\t\trootEditableElement.is( 'editableElement' ); // -> true\n\t *\t\trootEditableElement.is( 'element' ); // -> true\n\t *\t\trootEditableElement.is( 'node' ); // -> true\n\t *\t\trootEditableElement.is( 'view:editableElement' ); // -> true\n\t *\t\trootEditableElement.is( 'view:element' ); // -> true\n\t *\t\trootEditableElement.is( 'view:node' ); // -> true\n\t *\n\t *\t\trootEditableElement.is( 'model:element' ); // -> false\n\t *\t\trootEditableElement.is( 'documentFragment' ); // -> false\n\t *\n\t * Assuming that the object being checked is a root editable element, you can also check its\n\t * {@link module:engine/view/rooteditableelement~RootEditableElement#name name}:\n\t *\n\t *\t\trootEditableElement.is( 'element', 'div' ); // -> true if this is a div root editable element\n\t *\t\trootEditableElement.is( 'rootElement', 'div' ); // -> same as above\n\t *\t\ttext.is( 'element', 'div' ); -> false\n\t *\n\t * {@link module:engine/view/node~Node#is Check the entire list of view objects} which implement the `is()` method.\n\t *\n\t * @param {String} type Type to check.\n\t * @param {String} [name] Element name.\n\t * @returns {Boolean}\n\t */\n\tis( type, name = null ) {\n\t\tif ( !name ) {\n\t\t\treturn type === 'rootElement' || type === 'view:rootElement' ||\n\t\t\t\t// From super.is(). This is highly utilised method and cannot call super. See ckeditor/ckeditor5#6529.\n\t\t\t\ttype === 'editableElement' || type === 'view:editableElement' ||\n\t\t\t\ttype === 'containerElement' || type === 'view:containerElement' ||\n\t\t\t\ttype === 'element' || type === 'view:element' ||\n\t\t\t\ttype === 'node' || type === 'view:node';\n\t\t} else {\n\t\t\treturn name === this.name && (\n\t\t\t\ttype === 'rootElement' || type === 'view:rootElement' ||\n\t\t\t\t// From super.is(). This is highly utilised method and cannot call super. See ckeditor/ckeditor5#6529.\n\t\t\t\ttype === 'editableElement' || type === 'view:editableElement' ||\n\t\t\t\ttype === 'containerElement' || type === 'view:containerElement' ||\n\t\t\t\ttype === 'element' || type === 'view:element'\n\t\t\t);\n\t\t}\n\t}\n\n\tget rootName() {\n\t\treturn this.getCustomProperty( rootNameSymbol );\n\t}\n\n\tset rootName( rootName ) {\n\t\tthis._setCustomProperty( rootNameSymbol, rootName );\n\t}\n\n\t/**\n\t * Overrides old element name and sets new one.\n\t * This is needed because view roots are created before they are attached to the DOM.\n\t * The name of the root element is temporary at this stage. It has to be changed when the\n\t * view root element is attached to the DOM element.\n\t *\n\t * @protected\n\t * @param {String} name The new name of element.\n\t */\n\tset _name( name ) {\n\t\tthis.name = name;\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module engine/view/treewalker\n */\n\nimport Element from './element';\nimport Text from './text';\nimport TextProxy from './textproxy';\nimport Position from './position';\nimport CKEditorError from '@ckeditor/ckeditor5-utils/src/ckeditorerror';\n\n/**\n * Position iterator class. It allows to iterate forward and backward over the document.\n */\nexport default class TreeWalker {\n\t/**\n\t * Creates a range iterator. All parameters are optional, but you have to specify either `boundaries` or `startPosition`.\n\t *\n\t * @constructor\n\t * @param {Object} options Object with configuration.\n\t * @param {module:engine/view/range~Range} [options.boundaries=null] Range to define boundaries of the iterator.\n\t * @param {module:engine/view/position~Position} [options.startPosition] Starting position.\n\t * @param {'forward'|'backward'} [options.direction='forward'] Walking direction.\n\t * @param {Boolean} [options.singleCharacters=false] Flag indicating whether all characters from\n\t * {@link module:engine/view/text~Text} should be returned as one {@link module:engine/view/text~Text} (`false`) ore one by one as\n\t * {@link module:engine/view/textproxy~TextProxy} (`true`).\n\t * @param {Boolean} [options.shallow=false] Flag indicating whether iterator should enter elements or not. If the\n\t * iterator is shallow child nodes of any iterated node will not be returned along with `elementEnd` tag.\n\t * @param {Boolean} [options.ignoreElementEnd=false] Flag indicating whether iterator should ignore `elementEnd`\n\t * tags. If the option is true walker will not return a parent node of start position. If this option is `true`\n\t * each {@link module:engine/view/element~Element} will be returned once, while if the option is `false` they might be returned\n\t * twice: for `'elementStart'` and `'elementEnd'`.\n\t */\n\tconstructor( options = {} ) {\n\t\tif ( !options.boundaries && !options.startPosition ) {\n\t\t\t/**\n\t\t\t * Neither boundaries nor starting position have been defined.\n\t\t\t *\n\t\t\t * @error view-tree-walker-no-start-position\n\t\t\t */\n\t\t\tthrow new CKEditorError(\n\t\t\t\t'view-tree-walker-no-start-position',\n\t\t\t\tnull\n\t\t\t);\n\t\t}\n\n\t\tif ( options.direction && options.direction != 'forward' && options.direction != 'backward' ) {\n\t\t\t/**\n\t\t\t * Only `backward` and `forward` direction allowed.\n\t\t\t *\n\t\t\t * @error view-tree-walker-unknown-direction\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'view-tree-walker-unknown-direction', options.startPosition, { direction: options.direction } );\n\t\t}\n\n\t\t/**\n\t\t * Iterator boundaries.\n\t\t *\n\t\t * When the iterator is walking `'forward'` on the end of boundary or is walking `'backward'`\n\t\t * on the start of boundary, then `{ done: true }` is returned.\n\t\t *\n\t\t * If boundaries are not defined they are set before first and after last child of the root node.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:engine/view/range~Range} module:engine/view/treewalker~TreeWalker#boundaries\n\t\t */\n\t\tthis.boundaries = options.boundaries || null;\n\n\t\t/**\n\t\t * Iterator position. If start position is not defined then position depends on {@link #direction}. If direction is\n\t\t * `'forward'` position starts form the beginning, when direction is `'backward'` position starts from the end.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:engine/view/position~Position} module:engine/view/treewalker~TreeWalker#position\n\t\t */\n\t\tif ( options.startPosition ) {\n\t\t\tthis.position = Position._createAt( options.startPosition );\n\t\t} else {\n\t\t\tthis.position = Position._createAt( options.boundaries[ options.direction == 'backward' ? 'end' : 'start' ] );\n\t\t}\n\n\t\t/**\n\t\t * Walking direction. Defaults `'forward'`.\n\t\t *\n\t\t * @readonly\n\t\t * @member {'backward'|'forward'} module:engine/view/treewalker~TreeWalker#direction\n\t\t */\n\t\tthis.direction = options.direction || 'forward';\n\n\t\t/**\n\t\t * Flag indicating whether all characters from {@link module:engine/view/text~Text} should be returned as one\n\t\t * {@link module:engine/view/text~Text} or one by one as {@link module:engine/view/textproxy~TextProxy}.\n\t\t *\n\t\t * @readonly\n\t\t * @member {Boolean} module:engine/view/treewalker~TreeWalker#singleCharacters\n\t\t */\n\t\tthis.singleCharacters = !!options.singleCharacters;\n\n\t\t/**\n\t\t * Flag indicating whether iterator should enter elements or not. If the iterator is shallow child nodes of any\n\t\t * iterated node will not be returned along with `elementEnd` tag.\n\t\t *\n\t\t * @readonly\n\t\t * @member {Boolean} module:engine/view/treewalker~TreeWalker#shallow\n\t\t */\n\t\tthis.shallow = !!options.shallow;\n\n\t\t/**\n\t\t * Flag indicating whether iterator should ignore `elementEnd` tags. If set to `true`, walker will not\n\t\t * return a parent node of the start position. Each {@link module:engine/view/element~Element} will be returned once.\n\t\t * When set to `false` each element might be returned twice: for `'elementStart'` and `'elementEnd'`.\n\t\t *\n\t\t * @readonly\n\t\t * @member {Boolean} module:engine/view/treewalker~TreeWalker#ignoreElementEnd\n\t\t */\n\t\tthis.ignoreElementEnd = !!options.ignoreElementEnd;\n\n\t\t/**\n\t\t * Start boundary parent.\n\t\t *\n\t\t * @private\n\t\t * @member {module:engine/view/node~Node} module:engine/view/treewalker~TreeWalker#_boundaryStartParent\n\t\t */\n\t\tthis._boundaryStartParent = this.boundaries ? this.boundaries.start.parent : null;\n\n\t\t/**\n\t\t * End boundary parent.\n\t\t *\n\t\t * @private\n\t\t * @member {module:engine/view/node~Node} module:engine/view/treewalker~TreeWalker#_boundaryEndParent\n\t\t */\n\t\tthis._boundaryEndParent = this.boundaries ? this.boundaries.end.parent : null;\n\t}\n\n\t/**\n\t * Iterable interface.\n\t *\n\t * @returns {Iterable.<module:engine/view/treewalker~TreeWalkerValue>}\n\t */\n\t[ Symbol.iterator ]() {\n\t\treturn this;\n\t}\n\n\t/**\n\t * Moves {@link #position} in the {@link #direction} skipping values as long as the callback function returns `true`.\n\t *\n\t * For example:\n\t *\n\t * \t\twalker.skip( value => value.type == 'text' ); // <p>{}foo</p> -> <p>foo[]</p>\n\t * \t\twalker.skip( value => true ); // Move the position to the end: <p>{}foo</p> -> <p>foo</p>[]\n\t * \t\twalker.skip( value => false ); // Do not move the position.\n\t *\n\t * @param {Function} skip Callback function. Gets {@link module:engine/view/treewalker~TreeWalkerValue} and should\n\t * return `true` if the value should be skipped or `false` if not.\n\t */\n\tskip( skip ) {\n\t\tlet done, value, prevPosition;\n\n\t\tdo {\n\t\t\tprevPosition = this.position;\n\n\t\t\t( { done, value } = this.next() );\n\t\t} while ( !done && skip( value ) );\n\n\t\tif ( !done ) {\n\t\t\tthis.position = prevPosition;\n\t\t}\n\t}\n\n\t/**\n\t * Gets the next tree walker's value.\n\t *\n\t * @returns {module:engine/view/treewalker~TreeWalkerValue} Object implementing iterator interface, returning\n\t * information about taken step.\n\t */\n\tnext() {\n\t\tif ( this.direction == 'forward' ) {\n\t\t\treturn this._next();\n\t\t} else {\n\t\t\treturn this._previous();\n\t\t}\n\t}\n\n\t/**\n\t * Makes a step forward in view. Moves the {@link #position} to the next position and returns the encountered value.\n\t *\n\t * @private\n\t * @returns {Object}\n\t * @returns {Boolean} return.done `true` if iterator is done, `false` otherwise.\n\t * @returns {module:engine/view/treewalker~TreeWalkerValue} return.value Information about taken step.\n\t */\n\t_next() {\n\t\tlet position = this.position.clone();\n\t\tconst previousPosition = this.position;\n\t\tconst parent = position.parent;\n\n\t\t// We are at the end of the root.\n\t\tif ( parent.parent === null && position.offset === parent.childCount ) {\n\t\t\treturn { done: true };\n\t\t}\n\n\t\t// We reached the walker boundary.\n\t\tif ( parent === this._boundaryEndParent && position.offset == this.boundaries.end.offset ) {\n\t\t\treturn { done: true };\n\t\t}\n\n\t\t// Get node just after current position.\n\t\tlet node;\n\n\t\t// Text is a specific parent because it contains string instead of child nodes.\n\t\tif ( parent instanceof Text ) {\n\t\t\tif ( position.isAtEnd ) {\n\t\t\t\t// Prevent returning \"elementEnd\" for Text node. Skip that value and return the next walker step.\n\t\t\t\tthis.position = Position._createAfter( parent );\n\n\t\t\t\treturn this._next();\n\t\t\t}\n\n\t\t\tnode = parent.data[ position.offset ];\n\t\t} else {\n\t\t\tnode = parent.getChild( position.offset );\n\t\t}\n\n\t\tif ( node instanceof Element ) {\n\t\t\tif ( !this.shallow ) {\n\t\t\t\tposition = new Position( node, 0 );\n\t\t\t} else {\n\t\t\t\tposition.offset++;\n\t\t\t}\n\n\t\t\tthis.position = position;\n\n\t\t\treturn this._formatReturnValue( 'elementStart', node, previousPosition, position, 1 );\n\t\t} else if ( node instanceof Text ) {\n\t\t\tif ( this.singleCharacters ) {\n\t\t\t\tposition = new Position( node, 0 );\n\t\t\t\tthis.position = position;\n\n\t\t\t\treturn this._next();\n\t\t\t} else {\n\t\t\t\tlet charactersCount = node.data.length;\n\t\t\t\tlet item;\n\n\t\t\t\t// If text stick out of walker range, we need to cut it and wrap in TextProxy.\n\t\t\t\tif ( node == this._boundaryEndParent ) {\n\t\t\t\t\tcharactersCount = this.boundaries.end.offset;\n\t\t\t\t\titem = new TextProxy( node, 0, charactersCount );\n\t\t\t\t\tposition = Position._createAfter( item );\n\t\t\t\t} else {\n\t\t\t\t\titem = new TextProxy( node, 0, node.data.length );\n\t\t\t\t\t// If not just keep moving forward.\n\t\t\t\t\tposition.offset++;\n\t\t\t\t}\n\n\t\t\t\tthis.position = position;\n\n\t\t\t\treturn this._formatReturnValue( 'text', item, previousPosition, position, charactersCount );\n\t\t\t}\n\t\t} else if ( typeof node == 'string' ) {\n\t\t\tlet textLength;\n\n\t\t\tif ( this.singleCharacters ) {\n\t\t\t\ttextLength = 1;\n\t\t\t} else {\n\t\t\t\t// Check if text stick out of walker range.\n\t\t\t\tconst endOffset = parent === this._boundaryEndParent ? this.boundaries.end.offset : parent.data.length;\n\n\t\t\t\ttextLength = endOffset - position.offset;\n\t\t\t}\n\n\t\t\tconst textProxy = new TextProxy( parent, position.offset, textLength );\n\n\t\t\tposition.offset += textLength;\n\t\t\tthis.position = position;\n\n\t\t\treturn this._formatReturnValue( 'text', textProxy, previousPosition, position, textLength );\n\t\t} else {\n\t\t\t// `node` is not set, we reached the end of current `parent`.\n\t\t\tposition = Position._createAfter( parent );\n\t\t\tthis.position = position;\n\n\t\t\tif ( this.ignoreElementEnd ) {\n\t\t\t\treturn this._next();\n\t\t\t} else {\n\t\t\t\treturn this._formatReturnValue( 'elementEnd', parent, previousPosition, position );\n\t\t\t}\n\t\t}\n\t}\n\n\t/**\n\t * Makes a step backward in view. Moves the {@link #position} to the previous position and returns the encountered value.\n\t *\n\t * @private\n\t * @returns {Object}\n\t * @returns {Boolean} return.done True if iterator is done.\n\t * @returns {module:engine/view/treewalker~TreeWalkerValue} return.value Information about taken step.\n\t */\n\t_previous() {\n\t\tlet position = this.position.clone();\n\t\tconst previousPosition = this.position;\n\t\tconst parent = position.parent;\n\n\t\t// We are at the beginning of the root.\n\t\tif ( parent.parent === null && position.offset === 0 ) {\n\t\t\treturn { done: true };\n\t\t}\n\n\t\t// We reached the walker boundary.\n\t\tif ( parent == this._boundaryStartParent && position.offset == this.boundaries.start.offset ) {\n\t\t\treturn { done: true };\n\t\t}\n\n\t\t// Get node just before current position.\n\t\tlet node;\n\n\t\t// Text {@link module:engine/view/text~Text} element is a specific parent because contains string instead of child nodes.\n\t\tif ( parent instanceof Text ) {\n\t\t\tif ( position.isAtStart ) {\n\t\t\t\t// Prevent returning \"elementStart\" for Text node. Skip that value and return the next walker step.\n\t\t\t\tthis.position = Position._createBefore( parent );\n\n\t\t\t\treturn this._previous();\n\t\t\t}\n\n\t\t\tnode = parent.data[ position.offset - 1 ];\n\t\t} else {\n\t\t\tnode = parent.getChild( position.offset - 1 );\n\t\t}\n\n\t\tif ( node instanceof Element ) {\n\t\t\tif ( !this.shallow ) {\n\t\t\t\tposition = new Position( node, node.childCount );\n\t\t\t\tthis.position = position;\n\n\t\t\t\tif ( this.ignoreElementEnd ) {\n\t\t\t\t\treturn this._previous();\n\t\t\t\t} else {\n\t\t\t\t\treturn this._formatReturnValue( 'elementEnd', node, previousPosition, position );\n\t\t\t\t}\n\t\t\t} else {\n\t\t\t\tposition.offset--;\n\t\t\t\tthis.position = position;\n\n\t\t\t\treturn this._formatReturnValue( 'elementStart', node, previousPosition, position, 1 );\n\t\t\t}\n\t\t} else if ( node instanceof Text ) {\n\t\t\tif ( this.singleCharacters ) {\n\t\t\t\tposition = new Position( node, node.data.length );\n\t\t\t\tthis.position = position;\n\n\t\t\t\treturn this._previous();\n\t\t\t} else {\n\t\t\t\tlet charactersCount = node.data.length;\n\t\t\t\tlet item;\n\n\t\t\t\t// If text stick out of walker range, we need to cut it and wrap in TextProxy.\n\t\t\t\tif ( node == this._boundaryStartParent ) {\n\t\t\t\t\tconst offset = this.boundaries.start.offset;\n\n\t\t\t\t\titem = new TextProxy( node, offset, node.data.length - offset );\n\t\t\t\t\tcharactersCount = item.data.length;\n\t\t\t\t\tposition = Position._createBefore( item );\n\t\t\t\t} else {\n\t\t\t\t\titem = new TextProxy( node, 0, node.data.length );\n\t\t\t\t\t// If not just keep moving backward.\n\t\t\t\t\tposition.offset--;\n\t\t\t\t}\n\n\t\t\t\tthis.position = position;\n\n\t\t\t\treturn this._formatReturnValue( 'text', item, previousPosition, position, charactersCount );\n\t\t\t}\n\t\t} else if ( typeof node == 'string' ) {\n\t\t\tlet textLength;\n\n\t\t\tif ( !this.singleCharacters ) {\n\t\t\t\t// Check if text stick out of walker range.\n\t\t\t\tconst startOffset = parent === this._boundaryStartParent ? this.boundaries.start.offset : 0;\n\n\t\t\t\ttextLength = position.offset - startOffset;\n\t\t\t} else {\n\t\t\t\ttextLength = 1;\n\t\t\t}\n\n\t\t\tposition.offset -= textLength;\n\n\t\t\tconst textProxy = new TextProxy( parent, position.offset, textLength );\n\n\t\t\tthis.position = position;\n\n\t\t\treturn this._formatReturnValue( 'text', textProxy, previousPosition, position, textLength );\n\t\t} else {\n\t\t\t// `node` is not set, we reached the beginning of current `parent`.\n\t\t\tposition = Position._createBefore( parent );\n\t\t\tthis.position = position;\n\n\t\t\treturn this._formatReturnValue( 'elementStart', parent, previousPosition, position, 1 );\n\t\t}\n\t}\n\n\t/**\n\t * Format returned data and adjust `previousPosition` and `nextPosition` if reach the bound of the {@link module:engine/view/text~Text}.\n\t *\n\t * @private\n\t * @param {module:engine/view/treewalker~TreeWalkerValueType} type Type of step.\n\t * @param {module:engine/view/item~Item} item Item between old and new position.\n\t * @param {module:engine/view/position~Position} previousPosition Previous position of iterator.\n\t * @param {module:engine/view/position~Position} nextPosition Next position of iterator.\n\t * @param {Number} [length] Length of the item.\n\t * @returns {module:engine/view/treewalker~TreeWalkerValue}\n\t */\n\t_formatReturnValue( type, item, previousPosition, nextPosition, length ) {\n\t\t// Text is a specific parent, because contains string instead of children.\n\t\t// Walker doesn't enter to the Text except situations when walker is iterating over every single character,\n\t\t// or the bound starts/ends inside the Text. So when the position is at the beginning or at the end of the Text\n\t\t// we move it just before or just after Text.\n\t\tif ( item instanceof TextProxy ) {\n\t\t\t// Position is at the end of Text.\n\t\t\tif ( item.offsetInText + item.data.length == item.textNode.data.length ) {\n\t\t\t\tif ( this.direction == 'forward' && !( this.boundaries && this.boundaries.end.isEqual( this.position ) ) ) {\n\t\t\t\t\tnextPosition = Position._createAfter( item.textNode );\n\t\t\t\t\t// When we change nextPosition of returned value we need also update walker current position.\n\t\t\t\t\tthis.position = nextPosition;\n\t\t\t\t} else {\n\t\t\t\t\tpreviousPosition = Position._createAfter( item.textNode );\n\t\t\t\t}\n\t\t\t}\n\n\t\t\t// Position is at the begining ot the text.\n\t\t\tif ( item.offsetInText === 0 ) {\n\t\t\t\tif ( this.direction == 'backward' && !( this.boundaries && this.boundaries.start.isEqual( this.position ) ) ) {\n\t\t\t\t\tnextPosition = Position._createBefore( item.textNode );\n\t\t\t\t\t// When we change nextPosition of returned value we need also update walker current position.\n\t\t\t\t\tthis.position = nextPosition;\n\t\t\t\t} else {\n\t\t\t\t\tpreviousPosition = Position._createBefore( item.textNode );\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\n\t\treturn {\n\t\t\tdone: false,\n\t\t\tvalue: {\n\t\t\t\ttype,\n\t\t\t\titem,\n\t\t\t\tpreviousPosition,\n\t\t\t\tnextPosition,\n\t\t\t\tlength\n\t\t\t}\n\t\t};\n\t}\n}\n\n/**\n * Type of the step made by {@link module:engine/view/treewalker~TreeWalker}.\n * Possible values: `'elementStart'` if walker is at the beginning of a node, `'elementEnd'` if walker is at the end\n * of node, or `'text'` if walker traversed over single and multiple characters.\n * For {@link module:engine/view/text~Text} `elementStart` and `elementEnd` is not returned.\n *\n * @typedef {String} module:engine/view/treewalker~TreeWalkerValueType\n */\n\n/**\n * Object returned by {@link module:engine/view/treewalker~TreeWalker} when traversing tree view.\n *\n * @typedef {Object} module:engine/view/treewalker~TreeWalkerValue\n * @property {module:engine/view/treewalker~TreeWalkerValueType} type\n * @property {module:engine/view/item~Item} item Item between the old and the new positions\n * of the tree walker.\n * @property {module:engine/view/position~Position} previousPosition Previous position of the iterator.\n * * Forward iteration: For `'elementEnd'` it is the last position inside the element. For all other types it is the\n * position before the item.\n * * Backward iteration: For `'elementStart'` it is the first position inside the element. For all other types it is\n * the position after item.\n * * If the position is at the beginning or at the end of the {@link module:engine/view/text~Text} it is always moved from the\n * inside of the text to its parent just before or just after that text.\n * @property {module:engine/view/position~Position} nextPosition Next position of the iterator.\n * * Forward iteration: For `'elementStart'` it is the first position inside the element. For all other types it is\n * the position after the item.\n * * Backward iteration: For `'elementEnd'` it is last position inside element. For all other types it is the position\n * before the item.\n * * If the position is at the beginning or at the end of the {@link module:engine/view/text~Text} it is always moved from the\n * inside of the text to its parent just before or just after that text.\n * @property {Number} [length] Length of the item. For `'elementStart'` it is `1`. For `'text'` it is\n * the length of that text. For `'elementEnd'` it is `undefined`.\n */\n\n/**\n * Tree walking directions.\n *\n * @typedef {'forward'|'backward'} module:engine/view/treewalker~TreeWalkerDirection\n */\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module engine/view/position\n */\n\nimport TreeWalker from './treewalker';\n\nimport compareArrays from '@ckeditor/ckeditor5-utils/src/comparearrays';\nimport CKEditorError from '@ckeditor/ckeditor5-utils/src/ckeditorerror';\nimport EditableElement from './editableelement';\n\n// To check if component is loaded more than once.\nimport '@ckeditor/ckeditor5-utils/src/version';\n\n/**\n * Position in the view tree. Position is represented by its parent node and an offset in this parent.\n *\n * In order to create a new position instance use the `createPosition*()` factory methods available in:\n *\n * * {@link module:engine/view/view~View}\n * * {@link module:engine/view/downcastwriter~DowncastWriter}\n * * {@link module:engine/view/upcastwriter~UpcastWriter}\n */\nexport default class Position {\n\t/**\n\t * Creates a position.\n\t *\n\t * @param {module:engine/view/node~Node|module:engine/view/documentfragment~DocumentFragment} parent Position parent.\n\t * @param {Number} offset Position offset.\n\t */\n\tconstructor( parent, offset ) {\n\t\t/**\n\t\t * Position parent.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:engine/view/node~Node|module:engine/view/documentfragment~DocumentFragment}\n\t\t * module:engine/view/position~Position#parent\n\t\t */\n\t\tthis.parent = parent;\n\n\t\t/**\n\t\t * Position offset.\n\t\t *\n\t\t * @readonly\n\t\t * @member {Number} module:engine/view/position~Position#offset\n\t\t */\n\t\tthis.offset = offset;\n\t}\n\n\t/**\n\t * Node directly after the position. Equals `null` when there is no node after position or position is located\n\t * inside text node.\n\t *\n\t * @readonly\n\t * @type {module:engine/view/node~Node|null}\n\t */\n\tget nodeAfter() {\n\t\tif ( this.parent.is( '$text' ) ) {\n\t\t\treturn null;\n\t\t}\n\n\t\treturn this.parent.getChild( this.offset ) || null;\n\t}\n\n\t/**\n\t * Node directly before the position. Equals `null` when there is no node before position or position is located\n\t * inside text node.\n\t *\n\t * @readonly\n\t * @type {module:engine/view/node~Node|null}\n\t */\n\tget nodeBefore() {\n\t\tif ( this.parent.is( '$text' ) ) {\n\t\t\treturn null;\n\t\t}\n\n\t\treturn this.parent.getChild( this.offset - 1 ) || null;\n\t}\n\n\t/**\n\t * Is `true` if position is at the beginning of its {@link module:engine/view/position~Position#parent parent}, `false` otherwise.\n\t *\n\t * @readonly\n\t * @type {Boolean}\n\t */\n\tget isAtStart() {\n\t\treturn this.offset === 0;\n\t}\n\n\t/**\n\t * Is `true` if position is at the end of its {@link module:engine/view/position~Position#parent parent}, `false` otherwise.\n\t *\n\t * @readonly\n\t * @type {Boolean}\n\t */\n\tget isAtEnd() {\n\t\tconst endOffset = this.parent.is( '$text' ) ? this.parent.data.length : this.parent.childCount;\n\n\t\treturn this.offset === endOffset;\n\t}\n\n\t/**\n\t * Position's root, that is the root of the position's parent element.\n\t *\n\t * @readonly\n\t * @type {module:engine/view/node~Node|module:engine/view/documentfragment~DocumentFragment}\n\t */\n\tget root() {\n\t\treturn this.parent.root;\n\t}\n\n\t/**\n\t * {@link module:engine/view/editableelement~EditableElement EditableElement} instance that contains this position, or `null` if\n\t * position is not inside an editable element.\n\t *\n\t * @type {module:engine/view/editableelement~EditableElement|null}\n\t */\n\tget editableElement() {\n\t\tlet editable = this.parent;\n\n\t\twhile ( !( editable instanceof EditableElement ) ) {\n\t\t\tif ( editable.parent ) {\n\t\t\t\teditable = editable.parent;\n\t\t\t} else {\n\t\t\t\treturn null;\n\t\t\t}\n\t\t}\n\n\t\treturn editable;\n\t}\n\n\t/**\n\t * Returns a new instance of Position with offset incremented by `shift` value.\n\t *\n\t * @param {Number} shift How position offset should get changed. Accepts negative values.\n\t * @returns {module:engine/view/position~Position} Shifted position.\n\t */\n\tgetShiftedBy( shift ) {\n\t\tconst shifted = Position._createAt( this );\n\n\t\tconst offset = shifted.offset + shift;\n\t\tshifted.offset = offset < 0 ? 0 : offset;\n\n\t\treturn shifted;\n\t}\n\n\t/**\n\t * Gets the farthest position which matches the callback using\n\t * {@link module:engine/view/treewalker~TreeWalker TreeWalker}.\n\t *\n\t * For example:\n\t *\n\t * \t\tgetLastMatchingPosition( value => value.type == 'text' ); // <p>{}foo</p> -> <p>foo[]</p>\n\t * \t\tgetLastMatchingPosition( value => value.type == 'text', { direction: 'backward' } ); // <p>foo[]</p> -> <p>{}foo</p>\n\t * \t\tgetLastMatchingPosition( value => false ); // Do not move the position.\n\t *\n\t * @param {Function} skip Callback function. Gets {@link module:engine/view/treewalker~TreeWalkerValue} and should\n\t * return `true` if the value should be skipped or `false` if not.\n\t * @param {Object} options Object with configuration options. See {@link module:engine/view/treewalker~TreeWalker}.\n\t *\n\t * @returns {module:engine/view/position~Position} The position after the last item which matches the `skip` callback test.\n\t */\n\tgetLastMatchingPosition( skip, options = {} ) {\n\t\toptions.startPosition = this;\n\n\t\tconst treeWalker = new TreeWalker( options );\n\t\ttreeWalker.skip( skip );\n\n\t\treturn treeWalker.position;\n\t}\n\n\t/**\n\t * Returns ancestors array of this position, that is this position's parent and it's ancestors.\n\t *\n\t * @returns {Array} Array with ancestors.\n\t */\n\tgetAncestors() {\n\t\tif ( this.parent.is( 'documentFragment' ) ) {\n\t\t\treturn [ this.parent ];\n\t\t} else {\n\t\t\treturn this.parent.getAncestors( { includeSelf: true } );\n\t\t}\n\t}\n\n\t/**\n\t * Returns a {@link module:engine/view/node~Node} or {@link module:engine/view/documentfragment~DocumentFragment}\n\t * which is a common ancestor of both positions.\n\t *\n\t * @param {module:engine/view/position~Position} position\n\t * @returns {module:engine/view/node~Node|module:engine/view/documentfragment~DocumentFragment|null}\n\t */\n\tgetCommonAncestor( position ) {\n\t\tconst ancestorsA = this.getAncestors();\n\t\tconst ancestorsB = position.getAncestors();\n\n\t\tlet i = 0;\n\n\t\twhile ( ancestorsA[ i ] == ancestorsB[ i ] && ancestorsA[ i ] ) {\n\t\t\ti++;\n\t\t}\n\n\t\treturn i === 0 ? null : ancestorsA[ i - 1 ];\n\t}\n\n\t/**\n\t * Checks whether this object is of the given type.\n\t *\n\t *\t\tposition.is( 'position' ); // -> true\n\t *\t\tposition.is( 'view:position' ); // -> true\n\t *\n\t *\t\tposition.is( 'model:position' ); // -> false\n\t *\t\tposition.is( 'element' ); // -> false\n\t *\t\tposition.is( 'range' ); // -> false\n\t *\n\t * {@link module:engine/view/node~Node#is Check the entire list of view objects} which implement the `is()` method.\n\t *\n\t * @param {String} type\n\t * @returns {Boolean}\n\t */\n\tis( type ) {\n\t\treturn type === 'position' || type === 'view:position';\n\t}\n\n\t/**\n\t * Checks whether this position equals given position.\n\t *\n\t * @param {module:engine/view/position~Position} otherPosition Position to compare with.\n\t * @returns {Boolean} True if positions are same.\n\t */\n\tisEqual( otherPosition ) {\n\t\treturn ( this.parent == otherPosition.parent && this.offset == otherPosition.offset );\n\t}\n\n\t/**\n\t * Checks whether this position is located before given position. When method returns `false` it does not mean that\n\t * this position is after give one. Two positions may be located inside separate roots and in that situation this\n\t * method will still return `false`.\n\t *\n\t * @see module:engine/view/position~Position#isAfter\n\t * @see module:engine/view/position~Position#compareWith\n\t * @param {module:engine/view/position~Position} otherPosition Position to compare with.\n\t * @returns {Boolean} Returns `true` if this position is before given position.\n\t */\n\tisBefore( otherPosition ) {\n\t\treturn this.compareWith( otherPosition ) == 'before';\n\t}\n\n\t/**\n\t * Checks whether this position is located after given position. When method returns `false` it does not mean that\n\t * this position is before give one. Two positions may be located inside separate roots and in that situation this\n\t * method will still return `false`.\n\t *\n\t * @see module:engine/view/position~Position#isBefore\n\t * @see module:engine/view/position~Position#compareWith\n\t * @param {module:engine/view/position~Position} otherPosition Position to compare with.\n\t * @returns {Boolean} Returns `true` if this position is after given position.\n\t */\n\tisAfter( otherPosition ) {\n\t\treturn this.compareWith( otherPosition ) == 'after';\n\t}\n\n\t/**\n\t * Checks whether this position is before, after or in same position that other position. Two positions may be also\n\t * different when they are located in separate roots.\n\t *\n\t * @param {module:engine/view/position~Position} otherPosition Position to compare with.\n\t * @returns {module:engine/view/position~PositionRelation}\n\t */\n\tcompareWith( otherPosition ) {\n\t\tif ( this.root !== otherPosition.root ) {\n\t\t\treturn 'different';\n\t\t}\n\n\t\tif ( this.isEqual( otherPosition ) ) {\n\t\t\treturn 'same';\n\t\t}\n\n\t\t// Get path from root to position's parent element.\n\t\tconst thisPath = this.parent.is( 'node' ) ? this.parent.getPath() : [];\n\t\tconst otherPath = otherPosition.parent.is( 'node' ) ? otherPosition.parent.getPath() : [];\n\n\t\t// Add the positions' offsets to the parents offsets.\n\t\tthisPath.push( this.offset );\n\t\totherPath.push( otherPosition.offset );\n\n\t\t// Compare both path arrays to find common ancestor.\n\t\tconst result = compareArrays( thisPath, otherPath );\n\n\t\tswitch ( result ) {\n\t\t\tcase 'prefix':\n\t\t\t\treturn 'before';\n\n\t\t\tcase 'extension':\n\t\t\t\treturn 'after';\n\n\t\t\tdefault:\n\t\t\t\treturn thisPath[ result ] < otherPath[ result ] ? 'before' : 'after';\n\t\t}\n\t}\n\n\t/**\n\t * Creates a {@link module:engine/view/treewalker~TreeWalker TreeWalker} instance with this positions as a start position.\n\t *\n\t * @param {Object} options Object with configuration options. See {@link module:engine/view/treewalker~TreeWalker}\n\t * @param {module:engine/view/range~Range} [options.boundaries=null] Range to define boundaries of the iterator.\n\t * @param {Boolean} [options.singleCharacters=false]\n\t * @param {Boolean} [options.shallow=false]\n\t * @param {Boolean} [options.ignoreElementEnd=false]\n\t */\n\tgetWalker( options = {} ) {\n\t\toptions.startPosition = this;\n\n\t\treturn new TreeWalker( options );\n\t}\n\n\tclone() {\n\t\treturn new Position( this.parent, this.offset );\n\t}\n\n\t/**\n\t * Creates position at the given location. The location can be specified as:\n\t *\n\t * * a {@link module:engine/view/position~Position position},\n\t * * parent element and offset (offset defaults to `0`),\n\t * * parent element and `'end'` (sets position at the end of that element),\n\t * * {@link module:engine/view/item~Item view item} and `'before'` or `'after'` (sets position before or after given view item).\n\t *\n\t * This method is a shortcut to other constructors such as:\n\t *\n\t * * {@link module:engine/view/position~Position._createBefore},\n\t * * {@link module:engine/view/position~Position._createAfter}.\n\t *\n\t * @protected\n\t * @param {module:engine/view/item~Item|module:engine/view/position~Position} itemOrPosition\n\t * @param {Number|'end'|'before'|'after'} [offset] Offset or one of the flags. Used only when\n\t * first parameter is a {@link module:engine/view/item~Item view item}.\n\t */\n\tstatic _createAt( itemOrPosition, offset ) {\n\t\tif ( itemOrPosition instanceof Position ) {\n\t\t\treturn new this( itemOrPosition.parent, itemOrPosition.offset );\n\t\t} else {\n\t\t\tconst node = itemOrPosition;\n\n\t\t\tif ( offset == 'end' ) {\n\t\t\t\toffset = node.is( '$text' ) ? node.data.length : node.childCount;\n\t\t\t} else if ( offset == 'before' ) {\n\t\t\t\treturn this._createBefore( node );\n\t\t\t} else if ( offset == 'after' ) {\n\t\t\t\treturn this._createAfter( node );\n\t\t\t} else if ( offset !== 0 && !offset ) {\n\t\t\t\t/**\n\t\t\t\t * {@link module:engine/view/view~View#createPositionAt `View#createPositionAt()`}\n\t\t\t\t * requires the offset to be specified when the first parameter is a view item.\n\t\t\t\t *\n\t\t\t\t * @error view-createpositionat-offset-required\n\t\t\t\t */\n\t\t\t\tthrow new CKEditorError( 'view-createpositionat-offset-required', node );\n\t\t\t}\n\n\t\t\treturn new Position( node, offset );\n\t\t}\n\t}\n\n\t/**\n\t * Creates a new position after given view item.\n\t *\n\t * @protected\n\t * @param {module:engine/view/item~Item} item View item after which the position should be located.\n\t * @returns {module:engine/view/position~Position}\n\t */\n\tstatic _createAfter( item ) {\n\t\t// TextProxy is not a instance of Node so we need do handle it in specific way.\n\t\tif ( item.is( '$textProxy' ) ) {\n\t\t\treturn new Position( item.textNode, item.offsetInText + item.data.length );\n\t\t}\n\n\t\tif ( !item.parent ) {\n\t\t\t/**\n\t\t\t * You can not make a position after a root.\n\t\t\t *\n\t\t\t * @error view-position-after-root\n\t\t\t * @param {module:engine/view/node~Node} root\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'view-position-after-root', item, { root: item } );\n\t\t}\n\n\t\treturn new Position( item.parent, item.index + 1 );\n\t}\n\n\t/**\n\t * Creates a new position before given view item.\n\t *\n\t * @protected\n\t * @param {module:engine/view/item~Item} item View item before which the position should be located.\n\t * @returns {module:engine/view/position~Position}\n\t */\n\tstatic _createBefore( item ) {\n\t\t// TextProxy is not a instance of Node so we need do handle it in specific way.\n\t\tif ( item.is( '$textProxy' ) ) {\n\t\t\treturn new Position( item.textNode, item.offsetInText );\n\t\t}\n\n\t\tif ( !item.parent ) {\n\t\t\t/**\n\t\t\t * You cannot make a position before a root.\n\t\t\t *\n\t\t\t * @error view-position-before-root\n\t\t\t * @param {module:engine/view/node~Node} root\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'view-position-before-root', item, { root: item } );\n\t\t}\n\n\t\treturn new Position( item.parent, item.index );\n\t}\n}\n\n/**\n * A flag indicating whether this position is `'before'` or `'after'` or `'same'` as given position.\n * If positions are in different roots `'different'` flag is returned.\n *\n * @typedef {String} module:engine/view/position~PositionRelation\n */\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module engine/view/range\n */\n\nimport Position from './position';\nimport TreeWalker from './treewalker';\n\n/**\n * Range in the view tree. A range is represented by its start and end {@link module:engine/view/position~Position positions}.\n *\n * In order to create a new position instance use the `createPosition*()` factory methods available in:\n *\n * * {@link module:engine/view/view~View}\n * * {@link module:engine/view/downcastwriter~DowncastWriter}\n * * {@link module:engine/view/upcastwriter~UpcastWriter}\n */\nexport default class Range {\n\t/**\n\t * Creates a range spanning from `start` position to `end` position.\n\t *\n\t * **Note:** Constructor creates it's own {@link module:engine/view/position~Position} instances basing on passed values.\n\t *\n\t * @param {module:engine/view/position~Position} start Start position.\n\t * @param {module:engine/view/position~Position} [end] End position. If not set, range will be collapsed at the `start` position.\n\t */\n\tconstructor( start, end = null ) {\n\t\t/**\n\t\t * Start position.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:engine/view/position~Position}\n\t\t */\n\t\tthis.start = start.clone();\n\n\t\t/**\n\t\t * End position.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:engine/view/position~Position}\n\t\t */\n\t\tthis.end = end ? end.clone() : start.clone();\n\t}\n\n\t/**\n\t * Iterable interface.\n\t *\n\t * Iterates over all {@link module:engine/view/item~Item view items} that are in this range and returns\n\t * them together with additional information like length or {@link module:engine/view/position~Position positions},\n\t * grouped as {@link module:engine/view/treewalker~TreeWalkerValue}.\n\t *\n\t * This iterator uses {@link module:engine/view/treewalker~TreeWalker TreeWalker} with `boundaries` set to this range and\n\t * `ignoreElementEnd` option\n\t * set to `true`.\n\t *\n\t * @returns {Iterable.<module:engine/view/treewalker~TreeWalkerValue>}\n\t */\n\t* [ Symbol.iterator ]() {\n\t\tyield* new TreeWalker( { boundaries: this, ignoreElementEnd: true } );\n\t}\n\n\t/**\n\t * Returns whether the range is collapsed, that is it start and end positions are equal.\n\t *\n\t * @type {Boolean}\n\t */\n\tget isCollapsed() {\n\t\treturn this.start.isEqual( this.end );\n\t}\n\n\t/**\n\t * Returns whether this range is flat, that is if {@link module:engine/view/range~Range#start start} position and\n\t * {@link module:engine/view/range~Range#end end} position are in the same {@link module:engine/view/position~Position#parent parent}.\n\t *\n\t * @type {Boolean}\n\t */\n\tget isFlat() {\n\t\treturn this.start.parent === this.end.parent;\n\t}\n\n\t/**\n\t * Range root element.\n\t *\n\t * @type {module:engine/view/element~Element|module:engine/view/documentfragment~DocumentFragment}\n\t */\n\tget root() {\n\t\treturn this.start.root;\n\t}\n\n\t/**\n\t * Creates a maximal range that has the same content as this range but is expanded in both ways (at the beginning\n\t * and at the end).\n\t *\n\t * For example:\n\t *\n\t *\t\t<p>Foo</p><p><b>{Bar}</b></p> -> <p>Foo</p>[<p><b>Bar</b>]</p>\n\t *\t\t<p><b>foo</b>{bar}<span></span></p> -> <p><b>foo[</b>bar<span></span>]</p>\n\t *\n\t * Note that in the sample above:\n\t *\n\t * - `<p>` have type of {@link module:engine/view/containerelement~ContainerElement},\n\t * - `<b>` have type of {@link module:engine/view/attributeelement~AttributeElement},\n\t * - `<span>` have type of {@link module:engine/view/uielement~UIElement}.\n\t *\n\t * @returns {module:engine/view/range~Range} Enlarged range.\n\t */\n\tgetEnlarged() {\n\t\tlet start = this.start.getLastMatchingPosition( enlargeTrimSkip, { direction: 'backward' } );\n\t\tlet end = this.end.getLastMatchingPosition( enlargeTrimSkip );\n\n\t\t// Fix positions, in case if they are in Text node.\n\t\tif ( start.parent.is( '$text' ) && start.isAtStart ) {\n\t\t\tstart = Position._createBefore( start.parent );\n\t\t}\n\n\t\tif ( end.parent.is( '$text' ) && end.isAtEnd ) {\n\t\t\tend = Position._createAfter( end.parent );\n\t\t}\n\n\t\treturn new Range( start, end );\n\t}\n\n\t/**\n\t * Creates a minimum range that has the same content as this range but is trimmed in both ways (at the beginning\n\t * and at the end).\n\t *\n\t * For example:\n\t *\n\t *\t\t<p>Foo</p>[<p><b>Bar</b>]</p> -> <p>Foo</p><p><b>{Bar}</b></p>\n\t *\t\t<p><b>foo[</b>bar<span></span>]</p> -> <p><b>foo</b>{bar}<span></span></p>\n\t *\n\t * Note that in the sample above:\n\t *\n\t * - `<p>` have type of {@link module:engine/view/containerelement~ContainerElement},\n\t * - `<b>` have type of {@link module:engine/view/attributeelement~AttributeElement},\n\t * - `<span>` have type of {@link module:engine/view/uielement~UIElement}.\n\t *\n\t * @returns {module:engine/view/range~Range} Shrink range.\n\t */\n\tgetTrimmed() {\n\t\tlet start = this.start.getLastMatchingPosition( enlargeTrimSkip );\n\n\t\tif ( start.isAfter( this.end ) || start.isEqual( this.end ) ) {\n\t\t\treturn new Range( start, start );\n\t\t}\n\n\t\tlet end = this.end.getLastMatchingPosition( enlargeTrimSkip, { direction: 'backward' } );\n\t\tconst nodeAfterStart = start.nodeAfter;\n\t\tconst nodeBeforeEnd = end.nodeBefore;\n\n\t\t// Because TreeWalker prefers positions next to text node, we need to move them manually into these text nodes.\n\t\tif ( nodeAfterStart && nodeAfterStart.is( '$text' ) ) {\n\t\t\tstart = new Position( nodeAfterStart, 0 );\n\t\t}\n\n\t\tif ( nodeBeforeEnd && nodeBeforeEnd.is( '$text' ) ) {\n\t\t\tend = new Position( nodeBeforeEnd, nodeBeforeEnd.data.length );\n\t\t}\n\n\t\treturn new Range( start, end );\n\t}\n\n\t/**\n\t * Two ranges are equal if their start and end positions are equal.\n\t *\n\t * @param {module:engine/view/range~Range} otherRange Range to compare with.\n\t * @returns {Boolean} `true` if ranges are equal, `false` otherwise\n\t */\n\tisEqual( otherRange ) {\n\t\treturn this == otherRange || ( this.start.isEqual( otherRange.start ) && this.end.isEqual( otherRange.end ) );\n\t}\n\n\t/**\n\t * Checks whether this range contains given {@link module:engine/view/position~Position position}.\n\t *\n\t * @param {module:engine/view/position~Position} position Position to check.\n\t * @returns {Boolean} `true` if given {@link module:engine/view/position~Position position} is contained in this range,\n\t * `false` otherwise.\n\t */\n\tcontainsPosition( position ) {\n\t\treturn position.isAfter( this.start ) && position.isBefore( this.end );\n\t}\n\n\t/**\n\t * Checks whether this range contains given {@link module:engine/view/range~Range range}.\n\t *\n\t * @param {module:engine/view/range~Range} otherRange Range to check.\n\t * @param {Boolean} [loose=false] Whether the check is loose or strict. If the check is strict (`false`), compared range cannot\n\t * start or end at the same position as this range boundaries. If the check is loose (`true`), compared range can start, end or\n\t * even be equal to this range. Note that collapsed ranges are always compared in strict mode.\n\t * @returns {Boolean} `true` if given {@link module:engine/view/range~Range range} boundaries are contained by this range, `false`\n\t * otherwise.\n\t */\n\tcontainsRange( otherRange, loose = false ) {\n\t\tif ( otherRange.isCollapsed ) {\n\t\t\tloose = false;\n\t\t}\n\n\t\tconst containsStart = this.containsPosition( otherRange.start ) || ( loose && this.start.isEqual( otherRange.start ) );\n\t\tconst containsEnd = this.containsPosition( otherRange.end ) || ( loose && this.end.isEqual( otherRange.end ) );\n\n\t\treturn containsStart && containsEnd;\n\t}\n\n\t/**\n\t * Computes which part(s) of this {@link module:engine/view/range~Range range} is not a part of given\n\t * {@link module:engine/view/range~Range range}.\n\t * Returned array contains zero, one or two {@link module:engine/view/range~Range ranges}.\n\t *\n\t * Examples:\n\t *\n\t *\t\tlet foo = downcastWriter.createText( 'foo' );\n\t *\t\tlet img = downcastWriter.createContainerElement( 'img' );\n\t *\t\tlet bar = downcastWriter.createText( 'bar' );\n\t *\t\tlet p = downcastWriter.createContainerElement( 'p', null, [ foo, img, bar ] );\n\t *\n\t *\t\tlet range = view.createRange( view.createPositionAt( foo, 2 ), view.createPositionAt( bar, 1 ); // \"o\", img, \"b\" are in range.\n\t *\t\tlet otherRange = view.createRange( // \"oo\", img, \"ba\" are in range.\n\t *\t\t\tview.createPositionAt( foo, 1 ),\n\t *\t\t\tview.createPositionAt( bar, 2 )\n\t *\t\t);\n\t *\t\tlet transformed = range.getDifference( otherRange );\n\t *\t\t// transformed array has no ranges because `otherRange` contains `range`\n\t *\n\t *\t\totherRange = view.createRange( view.createPositionAt( foo, 1 ), view.createPositionAt( p, 2 ); // \"oo\", img are in range.\n\t *\t\ttransformed = range.getDifference( otherRange );\n\t *\t\t// transformed array has one range: from ( p, 2 ) to ( bar, 1 )\n\t *\n\t *\t\totherRange = view.createRange( view.createPositionAt( p, 1 ), view.createPositionAt( p, 2 ) ); // img is in range.\n\t *\t\ttransformed = range.getDifference( otherRange );\n\t *\t\t// transformed array has two ranges: from ( foo, 1 ) to ( p, 1 ) and from ( p, 2 ) to ( bar, 1 )\n\t *\n\t * @param {module:engine/view/range~Range} otherRange Range to differentiate against.\n\t * @returns {Array.<module:engine/view/range~Range>} The difference between ranges.\n\t */\n\tgetDifference( otherRange ) {\n\t\tconst ranges = [];\n\n\t\tif ( this.isIntersecting( otherRange ) ) {\n\t\t\t// Ranges intersect.\n\n\t\t\tif ( this.containsPosition( otherRange.start ) ) {\n\t\t\t\t// Given range start is inside this range. This means that we have to\n\t\t\t\t// add shrunken range - from the start to the middle of this range.\n\t\t\t\tranges.push( new Range( this.start, otherRange.start ) );\n\t\t\t}\n\n\t\t\tif ( this.containsPosition( otherRange.end ) ) {\n\t\t\t\t// Given range end is inside this range. This means that we have to\n\t\t\t\t// add shrunken range - from the middle of this range to the end.\n\t\t\t\tranges.push( new Range( otherRange.end, this.end ) );\n\t\t\t}\n\t\t} else {\n\t\t\t// Ranges do not intersect, return the original range.\n\t\t\tranges.push( this.clone() );\n\t\t}\n\n\t\treturn ranges;\n\t}\n\n\t/**\n\t * Returns an intersection of this {@link module:engine/view/range~Range range} and given {@link module:engine/view/range~Range range}.\n\t * Intersection is a common part of both of those ranges. If ranges has no common part, returns `null`.\n\t *\n\t * Examples:\n\t *\n\t *\t\tlet foo = downcastWriter.createText( 'foo' );\n\t *\t\tlet img = downcastWriter.createContainerElement( 'img' );\n\t *\t\tlet bar = downcastWriter.createText( 'bar' );\n\t *\t\tlet p = downcastWriter.createContainerElement( 'p', null, [ foo, img, bar ] );\n\t *\n\t *\t\tlet range = view.createRange( view.createPositionAt( foo, 2 ), view.createPositionAt( bar, 1 ); // \"o\", img, \"b\" are in range.\n\t *\t\tlet otherRange = view.createRange( view.createPositionAt( foo, 1 ), view.createPositionAt( p, 2 ); // \"oo\", img are in range.\n\t *\t\tlet transformed = range.getIntersection( otherRange ); // range from ( foo, 1 ) to ( p, 2 ).\n\t *\n\t *\t\totherRange = view.createRange( view.createPositionAt( bar, 1 ), view.createPositionAt( bar, 3 ); \"ar\" is in range.\n\t *\t\ttransformed = range.getIntersection( otherRange ); // null - no common part.\n\t *\n\t * @param {module:engine/view/range~Range} otherRange Range to check for intersection.\n\t * @returns {module:engine/view/range~Range|null} A common part of given ranges or `null` if ranges have no common part.\n\t */\n\tgetIntersection( otherRange ) {\n\t\tif ( this.isIntersecting( otherRange ) ) {\n\t\t\t// Ranges intersect, so a common range will be returned.\n\t\t\t// At most, it will be same as this range.\n\t\t\tlet commonRangeStart = this.start;\n\t\t\tlet commonRangeEnd = this.end;\n\n\t\t\tif ( this.containsPosition( otherRange.start ) ) {\n\t\t\t\t// Given range start is inside this range. This means thaNt we have to\n\t\t\t\t// shrink common range to the given range start.\n\t\t\t\tcommonRangeStart = otherRange.start;\n\t\t\t}\n\n\t\t\tif ( this.containsPosition( otherRange.end ) ) {\n\t\t\t\t// Given range end is inside this range. This means that we have to\n\t\t\t\t// shrink common range to the given range end.\n\t\t\t\tcommonRangeEnd = otherRange.end;\n\t\t\t}\n\n\t\t\treturn new Range( commonRangeStart, commonRangeEnd );\n\t\t}\n\n\t\t// Ranges do not intersect, so they do not have common part.\n\t\treturn null;\n\t}\n\n\t/**\n\t * Creates a {@link module:engine/view/treewalker~TreeWalker TreeWalker} instance with this range as a boundary.\n\t *\n\t * @param {Object} options Object with configuration options. See {@link module:engine/view/treewalker~TreeWalker}.\n\t * @param {module:engine/view/position~Position} [options.startPosition]\n\t * @param {Boolean} [options.singleCharacters=false]\n\t * @param {Boolean} [options.shallow=false]\n\t * @param {Boolean} [options.ignoreElementEnd=false]\n\t * @returns {module:engine/view/treewalker~TreeWalker}\n\t */\n\tgetWalker( options = {} ) {\n\t\toptions.boundaries = this;\n\n\t\treturn new TreeWalker( options );\n\t}\n\n\t/**\n\t * Returns a {@link module:engine/view/node~Node} or {@link module:engine/view/documentfragment~DocumentFragment}\n\t * which is a common ancestor of range's both ends (in which the entire range is contained).\n\t *\n\t * @returns {module:engine/view/node~Node|module:engine/view/documentfragment~DocumentFragment|null}\n\t */\n\tgetCommonAncestor() {\n\t\treturn this.start.getCommonAncestor( this.end );\n\t}\n\n\t/**\n\t * Returns an {@link module:engine/view/element~Element Element} contained by the range.\n\t * The element will be returned when it is the **only** node within the range and **fully–contained**\n\t * at the same time.\n\t *\n\t * @returns {module:engine/view/element~Element|null}\n\t */\n\tgetContainedElement() {\n\t\tif ( this.isCollapsed ) {\n\t\t\treturn null;\n\t\t}\n\n\t\tlet nodeAfterStart = this.start.nodeAfter;\n\t\tlet nodeBeforeEnd = this.end.nodeBefore;\n\n\t\t// Handle the situation when the range position is at the beginning / at the end of a text node.\n\t\t// In such situation `.nodeAfter` and `.nodeBefore` are `null` but the range still might be spanning\n\t\t// over one element.\n\t\t//\n\t\t// <p>Foo{<span class=\"widget\"></span>}bar</p> vs <p>Foo[<span class=\"widget\"></span>]bar</p>\n\t\t//\n\t\t// These are basically the same range, only the difference is if the range position is at\n\t\t// at the end/at the beginning of a text node or just before/just after the text node.\n\t\t//\n\t\tif ( this.start.parent.is( '$text' ) && this.start.isAtEnd && this.start.parent.nextSibling ) {\n\t\t\tnodeAfterStart = this.start.parent.nextSibling;\n\t\t}\n\n\t\tif ( this.end.parent.is( '$text' ) && this.end.isAtStart && this.end.parent.previousSibling ) {\n\t\t\tnodeBeforeEnd = this.end.parent.previousSibling;\n\t\t}\n\n\t\tif ( nodeAfterStart && nodeAfterStart.is( 'element' ) && nodeAfterStart === nodeBeforeEnd ) {\n\t\t\treturn nodeAfterStart;\n\t\t}\n\n\t\treturn null;\n\t}\n\n\t/**\n\t * Clones this range.\n\t *\n\t * @returns {module:engine/view/range~Range}\n\t */\n\tclone() {\n\t\treturn new Range( this.start, this.end );\n\t}\n\n\t/**\n\t * Returns an iterator that iterates over all {@link module:engine/view/item~Item view items} that are in this range and returns\n\t * them.\n\t *\n\t * This method uses {@link module:engine/view/treewalker~TreeWalker} with `boundaries` set to this range and `ignoreElementEnd` option\n\t * set to `true`. However it returns only {@link module:engine/view/item~Item items},\n\t * not {@link module:engine/view/treewalker~TreeWalkerValue}.\n\t *\n\t * You may specify additional options for the tree walker. See {@link module:engine/view/treewalker~TreeWalker} for\n\t * a full list of available options.\n\t *\n\t * @param {Object} options Object with configuration options. See {@link module:engine/view/treewalker~TreeWalker}.\n\t * @returns {Iterable.<module:engine/view/item~Item>}\n\t */\n\t* getItems( options = {} ) {\n\t\toptions.boundaries = this;\n\t\toptions.ignoreElementEnd = true;\n\n\t\tconst treeWalker = new TreeWalker( options );\n\n\t\tfor ( const value of treeWalker ) {\n\t\t\tyield value.item;\n\t\t}\n\t}\n\n\t/**\n\t * Returns an iterator that iterates over all {@link module:engine/view/position~Position positions} that are boundaries or\n\t * contained in this range.\n\t *\n\t * This method uses {@link module:engine/view/treewalker~TreeWalker} with `boundaries` set to this range. However it returns only\n\t * {@link module:engine/view/position~Position positions}, not {@link module:engine/view/treewalker~TreeWalkerValue}.\n\t *\n\t * You may specify additional options for the tree walker. See {@link module:engine/view/treewalker~TreeWalker} for\n\t * a full list of available options.\n\t *\n\t * @param {Object} options Object with configuration options. See {@link module:engine/view/treewalker~TreeWalker}.\n\t * @returns {Iterable.<module:engine/view/position~Position>}\n\t */\n\t* getPositions( options = {} ) {\n\t\toptions.boundaries = this;\n\n\t\tconst treeWalker = new TreeWalker( options );\n\n\t\tyield treeWalker.position;\n\n\t\tfor ( const value of treeWalker ) {\n\t\t\tyield value.nextPosition;\n\t\t}\n\t}\n\n\t/**\n\t * Checks whether this object is of the given type.\n\t *\n\t *\t\trange.is( 'range' ); // -> true\n\t *\t\trange.is( 'view:range' ); // -> true\n\t *\n\t *\t\trange.is( 'model:range' ); // -> false\n\t *\t\trange.is( 'element' ); // -> false\n\t *\t\trange.is( 'selection' ); // -> false\n\t *\n\t * {@link module:engine/view/node~Node#is Check the entire list of view objects} which implement the `is()` method.\n\t *\n\t * @param {String} type\n\t * @returns {Boolean}\n\t */\n\tis( type ) {\n\t\treturn type === 'range' || type === 'view:range';\n\t}\n\n\t/**\n\t * Checks and returns whether this range intersects with the given range.\n\t *\n\t * @param {module:engine/view/range~Range} otherRange Range to compare with.\n\t * @returns {Boolean} True if ranges intersect.\n\t */\n\tisIntersecting( otherRange ) {\n\t\treturn this.start.isBefore( otherRange.end ) && this.end.isAfter( otherRange.start );\n\t}\n\n\t/**\n\t * Creates a range from the given parents and offsets.\n\t *\n\t * @protected\n\t * @param {module:engine/view/node~Node|module:engine/view/documentfragment~DocumentFragment} startElement Start position\n\t * parent element.\n\t * @param {Number} startOffset Start position offset.\n\t * @param {module:engine/view/node~Node|module:engine/view/documentfragment~DocumentFragment} endElement End position\n\t * parent element.\n\t * @param {Number} endOffset End position offset.\n\t * @returns {module:engine/view/range~Range} Created range.\n\t */\n\tstatic _createFromParentsAndOffsets( startElement, startOffset, endElement, endOffset ) {\n\t\treturn new this(\n\t\t\tnew Position( startElement, startOffset ),\n\t\t\tnew Position( endElement, endOffset )\n\t\t);\n\t}\n\n\t/**\n\t * Creates a new range, spreading from specified {@link module:engine/view/position~Position position} to a position moved by\n\t * given `shift`. If `shift` is a negative value, shifted position is treated as the beginning of the range.\n\t *\n\t * @protected\n\t * @param {module:engine/view/position~Position} position Beginning of the range.\n\t * @param {Number} shift How long the range should be.\n\t * @returns {module:engine/view/range~Range}\n\t */\n\tstatic _createFromPositionAndShift( position, shift ) {\n\t\tconst start = position;\n\t\tconst end = position.getShiftedBy( shift );\n\n\t\treturn shift > 0 ? new this( start, end ) : new this( end, start );\n\t}\n\n\t/**\n\t * Creates a range inside an {@link module:engine/view/element~Element element} which starts before the first child of\n\t * that element and ends after the last child of that element.\n\t *\n\t * @protected\n\t * @param {module:engine/view/element~Element} element Element which is a parent for the range.\n\t * @returns {module:engine/view/range~Range}\n\t */\n\tstatic _createIn( element ) {\n\t\treturn this._createFromParentsAndOffsets( element, 0, element, element.childCount );\n\t}\n\n\t/**\n\t * Creates a range that starts before given {@link module:engine/view/item~Item view item} and ends after it.\n\t *\n\t * @protected\n\t * @param {module:engine/view/item~Item} item\n\t * @returns {module:engine/view/range~Range}\n\t */\n\tstatic _createOn( item ) {\n\t\tconst size = item.is( '$textProxy' ) ? item.offsetSize : 1;\n\n\t\treturn this._createFromPositionAndShift( Position._createBefore( item ), size );\n\t}\n}\n\n// Function used by getEnlarged and getTrimmed methods.\nfunction enlargeTrimSkip( value ) {\n\tif ( value.item.is( 'attributeElement' ) || value.item.is( 'uiElement' ) ) {\n\t\treturn true;\n\t}\n\n\treturn false;\n}\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module utils/count\n */\n\n/**\n * Returns the number of items return by the iterator.\n *\n *\t\tcount( [ 1, 2, 3, 4, 5 ] ); // 5;\n *\n * @param {Iterable.<*>} iterator Any iterator.\n * @returns {Number} Number of items returned by that iterator.\n */\nexport default function count( iterator ) {\n\tlet count = 0;\n\n\tfor ( const _ of iterator ) { // eslint-disable-line no-unused-vars\n\t\tcount++;\n\t}\n\n\treturn count;\n}\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module engine/view/selection\n */\n\nimport CKEditorError from '@ckeditor/ckeditor5-utils/src/ckeditorerror';\nimport Range from './range';\nimport Position from './position';\nimport mix from '@ckeditor/ckeditor5-utils/src/mix';\nimport EmitterMixin from '@ckeditor/ckeditor5-utils/src/emittermixin';\nimport Node from './node';\nimport count from '@ckeditor/ckeditor5-utils/src/count';\nimport isIterable from '@ckeditor/ckeditor5-utils/src/isiterable';\nimport DocumentSelection from './documentselection';\n\n/**\n * Class representing an arbirtary selection in the view.\n * See also {@link module:engine/view/documentselection~DocumentSelection}.\n *\n * New selection instances can be created via the constructor or one these methods:\n *\n * * {@link module:engine/view/view~View#createSelection `View#createSelection()`},\n * * {@link module:engine/view/upcastwriter~UpcastWriter#createSelection `UpcastWriter#createSelection()`}.\n *\n * A selection can consist of {@link module:engine/view/range~Range ranges} that can be set by using\n * the {@link module:engine/view/selection~Selection#setTo `Selection#setTo()`} method.\n */\nexport default class Selection {\n\t/**\n\t * Creates new selection instance.\n\t *\n\t * **Note**: The selection constructor is available as a factory method:\n\t *\n\t * * {@link module:engine/view/view~View#createSelection `View#createSelection()`},\n\t * * {@link module:engine/view/upcastwriter~UpcastWriter#createSelection `UpcastWriter#createSelection()`}.\n\t *\n\t * \t\t// Creates empty selection without ranges.\n\t *\t\tconst selection = writer.createSelection();\n\t *\n\t *\t\t// Creates selection at the given range.\n\t *\t\tconst range = writer.createRange( start, end );\n\t *\t\tconst selection = writer.createSelection( range );\n\t *\n\t *\t\t// Creates selection at the given ranges\n\t * \t\tconst ranges = [ writer.createRange( start1, end2 ), writer.createRange( star2, end2 ) ];\n\t *\t\tconst selection = writer.createSelection( ranges );\n\t *\n\t *\t\t// Creates selection from the other selection.\n\t *\t\tconst otherSelection = writer.createSelection();\n\t *\t\tconst selection = writer.createSelection( otherSelection );\n\t *\n\t *\t\t// Creates selection from the document selection.\n\t *\t\tconst selection = writer.createSelection( editor.editing.view.document.selection );\n\t *\n\t * \t\t// Creates selection at the given position.\n\t *\t\tconst position = writer.createPositionFromPath( root, path );\n\t *\t\tconst selection = writer.createSelection( position );\n\t *\n\t *\t\t// Creates collapsed selection at the position of given item and offset.\n\t *\t\tconst paragraph = writer.createContainerElement( 'paragraph' );\n\t *\t\tconst selection = writer.createSelection( paragraph, offset );\n\t *\n\t *\t\t// Creates a range inside an {@link module:engine/view/element~Element element} which starts before the\n\t *\t\t// first child of that element and ends after the last child of that element.\n\t *\t\tconst selection = writer.createSelection( paragraph, 'in' );\n\t *\n\t *\t\t// Creates a range on an {@link module:engine/view/item~Item item} which starts before the item and ends\n\t *\t\t// just after the item.\n\t *\t\tconst selection = writer.createSelection( paragraph, 'on' );\n\t *\n\t * `Selection`'s constructor allow passing additional options (`backward`, `fake` and `label`) as the last argument.\n\t *\n\t *\t\t// Creates backward selection.\n\t *\t\tconst selection = writer.createSelection( range, { backward: true } );\n\t *\n\t * Fake selection does not render as browser native selection over selected elements and is hidden to the user.\n\t * This way, no native selection UI artifacts are displayed to the user and selection over elements can be\n\t * represented in other way, for example by applying proper CSS class.\n\t *\n\t * Additionally fake's selection label can be provided. It will be used to describe fake selection in DOM\n\t * (and be  properly handled by screen readers).\n\t *\n\t *\t\t// Creates fake selection with label.\n\t *\t\tconst selection = writer.createSelection( range, { fake: true, label: 'foo' } );\n\t *\n\t * @param {module:engine/view/selection~Selectable} [selectable=null]\n\t * @param {Number|'before'|'end'|'after'|'on'|'in'} [placeOrOffset] Offset or place when selectable is an `Item`.\n\t * @param {Object} [options]\n\t * @param {Boolean} [options.backward] Sets this selection instance to be backward.\n\t * @param {Boolean} [options.fake] Sets this selection instance to be marked as `fake`.\n\t * @param {String} [options.label] Label for the fake selection.\n\t */\n\tconstructor( selectable = null, placeOrOffset, options ) {\n\t\t/**\n\t\t * Stores all ranges that are selected.\n\t\t *\n\t\t * @protected\n\t\t * @member {Array.<module:engine/view/range~Range>}\n\t\t */\n\t\tthis._ranges = [];\n\n\t\t/**\n\t\t * Specifies whether the last added range was added as a backward or forward range.\n\t\t *\n\t\t * @protected\n\t\t * @member {Boolean}\n\t\t */\n\t\tthis._lastRangeBackward = false;\n\n\t\t/**\n\t\t * Specifies whether selection instance is fake.\n\t\t *\n\t\t * @private\n\t\t * @member {Boolean}\n\t\t */\n\t\tthis._isFake = false;\n\n\t\t/**\n\t\t * Fake selection's label.\n\t\t *\n\t\t * @private\n\t\t * @member {String}\n\t\t */\n\t\tthis._fakeSelectionLabel = '';\n\n\t\tthis.setTo( selectable, placeOrOffset, options );\n\t}\n\n\t/**\n\t * Returns true if selection instance is marked as `fake`.\n\t *\n\t * @see #setTo\n\t * @returns {Boolean}\n\t */\n\tget isFake() {\n\t\treturn this._isFake;\n\t}\n\n\t/**\n\t * Returns fake selection label.\n\t *\n\t * @see #setTo\n\t * @returns {String}\n\t */\n\tget fakeSelectionLabel() {\n\t\treturn this._fakeSelectionLabel;\n\t}\n\n\t/**\n\t * Selection anchor. Anchor may be described as a position where the selection starts. Together with\n\t * {@link #focus focus} they define the direction of selection, which is important\n\t * when expanding/shrinking selection. Anchor is always the start or end of the most recent added range.\n\t * It may be a bit unintuitive when there are multiple ranges in selection.\n\t *\n\t * @see #focus\n\t * @type {module:engine/view/position~Position}\n\t */\n\tget anchor() {\n\t\tif ( !this._ranges.length ) {\n\t\t\treturn null;\n\t\t}\n\t\tconst range = this._ranges[ this._ranges.length - 1 ];\n\t\tconst anchor = this._lastRangeBackward ? range.end : range.start;\n\n\t\treturn anchor.clone();\n\t}\n\n\t/**\n\t * Selection focus. Focus is a position where the selection ends.\n\t *\n\t * @see #anchor\n\t * @type {module:engine/view/position~Position}\n\t */\n\tget focus() {\n\t\tif ( !this._ranges.length ) {\n\t\t\treturn null;\n\t\t}\n\t\tconst range = this._ranges[ this._ranges.length - 1 ];\n\t\tconst focus = this._lastRangeBackward ? range.start : range.end;\n\n\t\treturn focus.clone();\n\t}\n\n\t/**\n\t * Returns whether the selection is collapsed. Selection is collapsed when there is exactly one range which is\n\t * collapsed.\n\t *\n\t * @type {Boolean}\n\t */\n\tget isCollapsed() {\n\t\treturn this.rangeCount === 1 && this._ranges[ 0 ].isCollapsed;\n\t}\n\n\t/**\n\t * Returns number of ranges in selection.\n\t *\n\t * @type {Number}\n\t */\n\tget rangeCount() {\n\t\treturn this._ranges.length;\n\t}\n\n\t/**\n\t * Specifies whether the {@link #focus} precedes {@link #anchor}.\n\t *\n\t * @type {Boolean}\n\t */\n\tget isBackward() {\n\t\treturn !this.isCollapsed && this._lastRangeBackward;\n\t}\n\n\t/**\n\t * {@link module:engine/view/editableelement~EditableElement EditableElement} instance that contains this selection, or `null`\n\t * if the selection is not inside an editable element.\n\t *\n\t * @type {module:engine/view/editableelement~EditableElement|null}\n\t */\n\tget editableElement() {\n\t\tif ( this.anchor ) {\n\t\t\treturn this.anchor.editableElement;\n\t\t}\n\n\t\treturn null;\n\t}\n\n\t/**\n\t * Returns an iterable that contains copies of all ranges added to the selection.\n\t *\n\t * @returns {Iterable.<module:engine/view/range~Range>}\n\t */\n\t* getRanges() {\n\t\tfor ( const range of this._ranges ) {\n\t\t\tyield range.clone();\n\t\t}\n\t}\n\n\t/**\n\t * Returns copy of the first range in the selection. First range is the one which\n\t * {@link module:engine/view/range~Range#start start} position {@link module:engine/view/position~Position#isBefore is before} start\n\t * position of all other ranges (not to confuse with the first range added to the selection).\n\t * Returns `null` if no ranges are added to selection.\n\t *\n\t * @returns {module:engine/view/range~Range|null}\n\t */\n\tgetFirstRange() {\n\t\tlet first = null;\n\n\t\tfor ( const range of this._ranges ) {\n\t\t\tif ( !first || range.start.isBefore( first.start ) ) {\n\t\t\t\tfirst = range;\n\t\t\t}\n\t\t}\n\n\t\treturn first ? first.clone() : null;\n\t}\n\n\t/**\n\t * Returns copy of the last range in the selection. Last range is the one which {@link module:engine/view/range~Range#end end}\n\t * position {@link module:engine/view/position~Position#isAfter is after} end position of all other ranges (not to confuse\n\t * with the last range added to the selection). Returns `null` if no ranges are added to selection.\n\t *\n\t * @returns {module:engine/view/range~Range|null}\n\t */\n\tgetLastRange() {\n\t\tlet last = null;\n\n\t\tfor ( const range of this._ranges ) {\n\t\t\tif ( !last || range.end.isAfter( last.end ) ) {\n\t\t\t\tlast = range;\n\t\t\t}\n\t\t}\n\n\t\treturn last ? last.clone() : null;\n\t}\n\n\t/**\n\t * Returns copy of the first position in the selection. First position is the position that\n\t * {@link module:engine/view/position~Position#isBefore is before} any other position in the selection ranges.\n\t * Returns `null` if no ranges are added to selection.\n\t *\n\t * @returns {module:engine/view/position~Position|null}\n\t */\n\tgetFirstPosition() {\n\t\tconst firstRange = this.getFirstRange();\n\n\t\treturn firstRange ? firstRange.start.clone() : null;\n\t}\n\n\t/**\n\t * Returns copy of the last position in the selection. Last position is the position that\n\t * {@link module:engine/view/position~Position#isAfter is after} any other position in the selection ranges.\n\t * Returns `null` if no ranges are added to selection.\n\t *\n\t * @returns {module:engine/view/position~Position|null}\n\t */\n\tgetLastPosition() {\n\t\tconst lastRange = this.getLastRange();\n\n\t\treturn lastRange ? lastRange.end.clone() : null;\n\t}\n\n\t/**\n\t * Checks whether, this selection is equal to given selection. Selections are equal if they have same directions,\n\t * same number of ranges and all ranges from one selection equal to a range from other selection.\n\t *\n\t * @param {module:engine/view/selection~Selection|module:engine/view/documentselection~DocumentSelection} otherSelection\n\t * Selection to compare with.\n\t * @returns {Boolean} `true` if selections are equal, `false` otherwise.\n\t */\n\tisEqual( otherSelection ) {\n\t\tif ( this.isFake != otherSelection.isFake ) {\n\t\t\treturn false;\n\t\t}\n\n\t\tif ( this.isFake && this.fakeSelectionLabel != otherSelection.fakeSelectionLabel ) {\n\t\t\treturn false;\n\t\t}\n\n\t\tif ( this.rangeCount != otherSelection.rangeCount ) {\n\t\t\treturn false;\n\t\t} else if ( this.rangeCount === 0 ) {\n\t\t\treturn true;\n\t\t}\n\n\t\tif ( !this.anchor.isEqual( otherSelection.anchor ) || !this.focus.isEqual( otherSelection.focus ) ) {\n\t\t\treturn false;\n\t\t}\n\n\t\tfor ( const thisRange of this._ranges ) {\n\t\t\tlet found = false;\n\n\t\t\tfor ( const otherRange of otherSelection._ranges ) {\n\t\t\t\tif ( thisRange.isEqual( otherRange ) ) {\n\t\t\t\t\tfound = true;\n\t\t\t\t\tbreak;\n\t\t\t\t}\n\t\t\t}\n\n\t\t\tif ( !found ) {\n\t\t\t\treturn false;\n\t\t\t}\n\t\t}\n\n\t\treturn true;\n\t}\n\n\t/**\n\t * Checks whether this selection is similar to given selection. Selections are similar if they have same directions, same\n\t * number of ranges, and all {@link module:engine/view/range~Range#getTrimmed trimmed} ranges from one selection are\n\t * equal to any trimmed range from other selection.\n\t *\n\t * @param {module:engine/view/selection~Selection|module:engine/view/documentselection~DocumentSelection} otherSelection\n\t * Selection to compare with.\n\t * @returns {Boolean} `true` if selections are similar, `false` otherwise.\n\t */\n\tisSimilar( otherSelection ) {\n\t\tif ( this.isBackward != otherSelection.isBackward ) {\n\t\t\treturn false;\n\t\t}\n\n\t\tconst numOfRangesA = count( this.getRanges() );\n\t\tconst numOfRangesB = count( otherSelection.getRanges() );\n\n\t\t// If selections have different number of ranges, they cannot be similar.\n\t\tif ( numOfRangesA != numOfRangesB ) {\n\t\t\treturn false;\n\t\t}\n\n\t\t// If both selections have no ranges, they are similar.\n\t\tif ( numOfRangesA == 0 ) {\n\t\t\treturn true;\n\t\t}\n\n\t\t// Check if each range in one selection has a similar range in other selection.\n\t\tfor ( let rangeA of this.getRanges() ) {\n\t\t\trangeA = rangeA.getTrimmed();\n\n\t\t\tlet found = false;\n\n\t\t\tfor ( let rangeB of otherSelection.getRanges() ) {\n\t\t\t\trangeB = rangeB.getTrimmed();\n\n\t\t\t\tif ( rangeA.start.isEqual( rangeB.start ) && rangeA.end.isEqual( rangeB.end ) ) {\n\t\t\t\t\tfound = true;\n\t\t\t\t\tbreak;\n\t\t\t\t}\n\t\t\t}\n\n\t\t\t// For `rangeA`, neither range in `otherSelection` was similar. So selections are not similar.\n\t\t\tif ( !found ) {\n\t\t\t\treturn false;\n\t\t\t}\n\t\t}\n\n\t\t// There were no ranges that weren't matched. Selections are similar.\n\t\treturn true;\n\t}\n\n\t/**\n\t * Returns the selected element. {@link module:engine/view/element~Element Element} is considered as selected if there is only\n\t * one range in the selection, and that range contains exactly one element.\n\t * Returns `null` if there is no selected element.\n\t *\n\t * @returns {module:engine/view/element~Element|null}\n\t */\n\tgetSelectedElement() {\n\t\tif ( this.rangeCount !== 1 ) {\n\t\t\treturn null;\n\t\t}\n\n\t\treturn this.getFirstRange().getContainedElement();\n\t}\n\n\t/**\n\t * Sets this selection's ranges and direction to the specified location based on the given\n\t * {@link module:engine/view/selection~Selectable selectable}.\n\t *\n\t *\t\t// Sets selection to the given range.\n\t *\t\tconst range = writer.createRange( start, end );\n\t *\t\tselection.setTo( range );\n\t *\n\t *\t\t// Sets selection to given ranges.\n\t * \t\tconst ranges = [ writer.createRange( start1, end2 ), writer.createRange( star2, end2 ) ];\n\t *\t\tselection.setTo( range );\n\t *\n\t *\t\t// Sets selection to the other selection.\n\t *\t\tconst otherSelection = writer.createSelection();\n\t *\t\tselection.setTo( otherSelection );\n\t *\n\t *\t \t// Sets selection to contents of DocumentSelection.\n\t *\t\tselection.setTo( editor.editing.view.document.selection );\n\t *\n\t * \t\t// Sets collapsed selection at the given position.\n\t *\t\tconst position = writer.createPositionAt( root, path );\n\t *\t\tselection.setTo( position );\n\t *\n\t * \t\t// Sets collapsed selection at the position of given item and offset.\n\t *\t\tselection.setTo( paragraph, offset );\n\t *\n\t * Creates a range inside an {@link module:engine/view/element~Element element} which starts before the first child of\n\t * that element and ends after the last child of that element.\n\t *\n\t *\t\tselection.setTo( paragraph, 'in' );\n\t *\n\t * Creates a range on an {@link module:engine/view/item~Item item} which starts before the item and ends just after the item.\n\t *\n\t *\t\tselection.setTo( paragraph, 'on' );\n\t *\n\t * \t\t// Clears selection. Removes all ranges.\n\t *\t\tselection.setTo( null );\n\t *\n\t * `Selection#setTo()` method allow passing additional options (`backward`, `fake` and `label`) as the last argument.\n\t *\n\t *\t\t// Sets selection as backward.\n\t *\t\tselection.setTo( range, { backward: true } );\n\t *\n\t * Fake selection does not render as browser native selection over selected elements and is hidden to the user.\n\t * This way, no native selection UI artifacts are displayed to the user and selection over elements can be\n\t * represented in other way, for example by applying proper CSS class.\n\t *\n\t * Additionally fake's selection label can be provided. It will be used to describe fake selection in DOM\n\t * (and be  properly handled by screen readers).\n\t *\n\t *\t\t// Creates fake selection with label.\n\t *\t\tselection.setTo( range, { fake: true, label: 'foo' } );\n\t *\n\t * @fires change\n\t * @param {module:engine/view/selection~Selectable} selectable\n\t * @param {Number|'before'|'end'|'after'|'on'|'in'} [placeOrOffset] Sets place or offset of the selection.\n\t * @param {Object} [options]\n\t * @param {Boolean} [options.backward] Sets this selection instance to be backward.\n\t * @param {Boolean} [options.fake] Sets this selection instance to be marked as `fake`.\n\t * @param {String} [options.label] Label for the fake selection.\n\t */\n\tsetTo( selectable, placeOrOffset, options ) {\n\t\tif ( selectable === null ) {\n\t\t\tthis._setRanges( [] );\n\t\t\tthis._setFakeOptions( placeOrOffset );\n\t\t} else if ( selectable instanceof Selection || selectable instanceof DocumentSelection ) {\n\t\t\tthis._setRanges( selectable.getRanges(), selectable.isBackward );\n\t\t\tthis._setFakeOptions( { fake: selectable.isFake, label: selectable.fakeSelectionLabel } );\n\t\t} else if ( selectable instanceof Range ) {\n\t\t\tthis._setRanges( [ selectable ], placeOrOffset && placeOrOffset.backward );\n\t\t\tthis._setFakeOptions( placeOrOffset );\n\t\t} else if ( selectable instanceof Position ) {\n\t\t\tthis._setRanges( [ new Range( selectable ) ] );\n\t\t\tthis._setFakeOptions( placeOrOffset );\n\t\t} else if ( selectable instanceof Node ) {\n\t\t\tconst backward = !!options && !!options.backward;\n\t\t\tlet range;\n\n\t\t\tif ( placeOrOffset === undefined ) {\n\t\t\t\t/**\n\t\t\t\t * selection.setTo requires the second parameter when the first parameter is a node.\n\t\t\t\t *\n\t\t\t\t * @error view-selection-setto-required-second-parameter\n\t\t\t\t */\n\t\t\t\tthrow new CKEditorError( 'view-selection-setto-required-second-parameter', this );\n\t\t\t} else if ( placeOrOffset == 'in' ) {\n\t\t\t\trange = Range._createIn( selectable );\n\t\t\t} else if ( placeOrOffset == 'on' ) {\n\t\t\t\trange = Range._createOn( selectable );\n\t\t\t} else {\n\t\t\t\trange = new Range( Position._createAt( selectable, placeOrOffset ) );\n\t\t\t}\n\n\t\t\tthis._setRanges( [ range ], backward );\n\t\t\tthis._setFakeOptions( options );\n\t\t} else if ( isIterable( selectable ) ) {\n\t\t\t// We assume that the selectable is an iterable of ranges.\n\t\t\t// Array.from() is used to prevent setting ranges to the old iterable\n\t\t\tthis._setRanges( selectable, placeOrOffset && placeOrOffset.backward );\n\t\t\tthis._setFakeOptions( placeOrOffset );\n\t\t} else {\n\t\t\t/**\n\t\t\t * Cannot set selection to given place.\n\t\t\t *\n\t\t\t * @error view-selection-setto-not-selectable\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'view-selection-setto-not-selectable', this );\n\t\t}\n\n\t\tthis.fire( 'change' );\n\t}\n\n\t/**\n\t * Moves {@link #focus} to the specified location.\n\t *\n\t * The location can be specified in the same form as {@link module:engine/view/view~View#createPositionAt view.createPositionAt()}\n\t * parameters.\n\t *\n\t * @fires change\n\t * @param {module:engine/view/item~Item|module:engine/view/position~Position} itemOrPosition\n\t * @param {Number|'end'|'before'|'after'} [offset] Offset or one of the flags. Used only when\n\t * first parameter is a {@link module:engine/view/item~Item view item}.\n\t */\n\tsetFocus( itemOrPosition, offset ) {\n\t\tif ( this.anchor === null ) {\n\t\t\t/**\n\t\t\t * Cannot set selection focus if there are no ranges in selection.\n\t\t\t *\n\t\t\t * @error view-selection-setfocus-no-ranges\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'view-selection-setfocus-no-ranges', this );\n\t\t}\n\n\t\tconst newFocus = Position._createAt( itemOrPosition, offset );\n\n\t\tif ( newFocus.compareWith( this.focus ) == 'same' ) {\n\t\t\treturn;\n\t\t}\n\n\t\tconst anchor = this.anchor;\n\n\t\tthis._ranges.pop();\n\n\t\tif ( newFocus.compareWith( anchor ) == 'before' ) {\n\t\t\tthis._addRange( new Range( newFocus, anchor ), true );\n\t\t} else {\n\t\t\tthis._addRange( new Range( anchor, newFocus ) );\n\t\t}\n\n\t\tthis.fire( 'change' );\n\t}\n\n\t/**\n\t * Checks whether this object is of the given type.\n\t *\n\t *\t\tselection.is( 'selection' ); // -> true\n\t *\t\tselection.is( 'view:selection' ); // -> true\n\t *\n\t *\t\tselection.is( 'model:selection' ); // -> false\n\t *\t\tselection.is( 'element' ); // -> false\n\t *\t\tselection.is( 'range' ); // -> false\n\t *\n\t * {@link module:engine/view/node~Node#is Check the entire list of view objects} which implement the `is()` method.\n\t *\n\t * @param {String} type\n\t * @returns {Boolean}\n\t */\n\tis( type ) {\n\t\treturn type === 'selection' || type === 'view:selection';\n\t}\n\n\t/**\n\t * Replaces all ranges that were added to the selection with given array of ranges. Last range of the array\n\t * is treated like the last added range and is used to set {@link #anchor anchor} and {@link #focus focus}.\n\t * Accepts a flag describing in which way the selection is made.\n\t *\n\t * @private\n\t * @param {Iterable.<module:engine/view/range~Range>} newRanges Iterable object of ranges to set.\n\t * @param {Boolean} [isLastBackward=false] Flag describing if last added range was selected forward - from start to end\n\t * (`false`) or backward - from end to start (`true`). Defaults to `false`.\n\t */\n\t_setRanges( newRanges, isLastBackward = false ) {\n\t\t// New ranges should be copied to prevent removing them by setting them to `[]` first.\n\t\t// Only applies to situations when selection is set to the same selection or same selection's ranges.\n\t\tnewRanges = Array.from( newRanges );\n\n\t\tthis._ranges = [];\n\n\t\tfor ( const range of newRanges ) {\n\t\t\tthis._addRange( range );\n\t\t}\n\n\t\tthis._lastRangeBackward = !!isLastBackward;\n\t}\n\n\t/**\n\t * Sets this selection instance to be marked as `fake`. A fake selection does not render as browser native selection\n\t * over selected elements and is hidden to the user. This way, no native selection UI artifacts are displayed to\n\t * the user and selection over elements can be represented in other way, for example by applying proper CSS class.\n\t *\n\t * Additionally fake's selection label can be provided. It will be used to describe fake selection in DOM (and be\n\t * properly handled by screen readers).\n\t *\n\t * @private\n\t * @param {Object} [options] Options.\n\t * @param {Boolean} [options.fake] If set to true selection will be marked as `fake`.\n\t * @param {String} [options.label=''] Fake selection label.\n\t */\n\t_setFakeOptions( options = {} ) {\n\t\tthis._isFake = !!options.fake;\n\t\tthis._fakeSelectionLabel = options.fake ? options.label || '' : '';\n\t}\n\n\t/**\n\t * Adds a range to the selection. Added range is copied. This means that passed range is not saved in the\n\t * selection instance and you can safely operate on it.\n\t *\n\t * Accepts a flag describing in which way the selection is made - passed range might be selected from\n\t * {@link module:engine/view/range~Range#start start} to {@link module:engine/view/range~Range#end end}\n\t * or from {@link module:engine/view/range~Range#end end} to {@link module:engine/view/range~Range#start start}.\n\t * The flag is used to set {@link #anchor anchor} and {@link #focus focus} properties.\n\t *\n\t * Throws {@link module:utils/ckeditorerror~CKEditorError CKEditorError} `view-selection-range-intersects` if added range intersects\n\t * with ranges already stored in Selection instance.\n\t *\n\t * @private\n\t * @fires change\n\t * @param {module:engine/view/range~Range} range\n\t * @param {Boolean} [isBackward]\n\t */\n\t_addRange( range, isBackward = false ) {\n\t\tif ( !( range instanceof Range ) ) {\n\t\t\t/**\n\t\t\t * Selection range set to an object that is not an instance of {@link module:engine/view/range~Range}.\n\t\t\t *\n\t\t\t * @error view-selection-add-range-not-range\n\t\t\t */\n\t\t\tthrow new CKEditorError(\n\t\t\t\t'view-selection-add-range-not-range',\n\t\t\t\tthis\n\t\t\t);\n\t\t}\n\n\t\tthis._pushRange( range );\n\t\tthis._lastRangeBackward = !!isBackward;\n\t}\n\n\t/**\n\t * Adds range to selection - creates copy of given range so it can be safely used and modified.\n\t *\n\t * Throws {@link module:utils/ckeditorerror~CKEditorError CKEditorError} `view-selection-range-intersects` if added range intersects\n\t * with ranges already stored in selection instance.\n\t *\n\t * @private\n\t * @param {module:engine/view/range~Range} range\n\t */\n\t_pushRange( range ) {\n\t\tfor ( const storedRange of this._ranges ) {\n\t\t\tif ( range.isIntersecting( storedRange ) ) {\n\t\t\t\t/**\n\t\t\t\t * Trying to add a range that intersects with another range from selection.\n\t\t\t\t *\n\t\t\t\t * @error view-selection-range-intersects\n\t\t\t\t * @param {module:engine/view/range~Range} addedRange Range that was added to the selection.\n\t\t\t\t * @param {module:engine/view/range~Range} intersectingRange Range from selection that intersects with `addedRange`.\n\t\t\t\t */\n\t\t\t\tthrow new CKEditorError(\n\t\t\t\t\t'view-selection-range-intersects',\n\t\t\t\t\tthis,\n\t\t\t\t\t{ addedRange: range, intersectingRange: storedRange }\n\t\t\t\t);\n\t\t\t}\n\t\t}\n\n\t\tthis._ranges.push( new Range( range.start, range.end ) );\n\t}\n\n\t/**\n\t * Fired whenever selection ranges are changed through {@link ~Selection Selection API}.\n\t *\n\t * @event change\n\t */\n}\n\nmix( Selection, EmitterMixin );\n\n/**\n * An entity that is used to set selection.\n *\n * See also {@link module:engine/view/selection~Selection#setTo}\n *\n * @typedef {\n *    module:engine/view/selection~Selection|\n *    module:engine/view/documentselection~DocumentSelection|\n *    module:engine/view/position~Position|\n *    Iterable.<module:engine/view/range~Range>|\n *    module:engine/view/range~Range|\n *    module:engine/view/item~Item|\n *    null\n * } module:engine/view/selection~Selectable\n */\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module engine/view/documentselection\n */\n\nimport Selection from './selection';\nimport mix from '@ckeditor/ckeditor5-utils/src/mix';\nimport EmitterMixin from '@ckeditor/ckeditor5-utils/src/emittermixin';\n\n/**\n * Class representing the document selection in the view.\n *\n * Its instance is available in {@link module:engine/view/document~Document#selection `Document#selection`}.\n *\n * It is similar to {@link module:engine/view/selection~Selection} but\n * it has a read-only API and can be modified only by the writer available in\n * the {@link module:engine/view/view~View#change `View#change()`} block\n * (so via {@link module:engine/view/downcastwriter~DowncastWriter#setSelection `DowncastWriter#setSelection()`}).\n */\nexport default class DocumentSelection {\n\t/**\n\t * Creates new DocumentSelection instance.\n\t *\n\t * \t\t// Creates empty selection without ranges.\n\t *\t\tconst selection = new DocumentSelection();\n\t *\n\t *\t\t// Creates selection at the given range.\n\t *\t\tconst range = writer.createRange( start, end );\n\t *\t\tconst selection = new DocumentSelection( range );\n\t *\n\t *\t\t// Creates selection at the given ranges\n\t * \t\tconst ranges = [ writer.createRange( start1, end2 ), writer.createRange( start2, end2 ) ];\n\t *\t\tconst selection = new DocumentSelection( ranges );\n\t *\n\t *\t\t// Creates selection from the other selection.\n\t *\t\tconst otherSelection = writer.createSelection();\n\t *\t\tconst selection = new DocumentSelection( otherSelection );\n\t *\n\t * \t\t// Creates selection at the given position.\n\t *\t\tconst position = writer.createPositionAt( root, offset );\n\t *\t\tconst selection = new DocumentSelection( position );\n\t *\n\t *\t\t// Creates collapsed selection at the position of given item and offset.\n\t *\t\tconst paragraph = writer.createContainerElement( 'paragraph' );\n\t *\t\tconst selection = new DocumentSelection( paragraph, offset );\n\t *\n\t *\t\t// Creates a range inside an {@link module:engine/view/element~Element element} which starts before the\n\t *\t\t// first child of that element and ends after the last child of that element.\n\t *\t\tconst selection = new DocumentSelection( paragraph, 'in' );\n\t *\n\t *\t\t// Creates a range on an {@link module:engine/view/item~Item item} which starts before the item and ends\n\t *\t\t// just after the item.\n\t *\t\tconst selection = new DocumentSelection( paragraph, 'on' );\n\t *\n\t * `Selection`'s constructor allow passing additional options (`backward`, `fake` and `label`) as the last argument.\n\t *\n\t *\t\t// Creates backward selection.\n\t *\t\tconst selection = new DocumentSelection( range, { backward: true } );\n\t *\n\t * Fake selection does not render as browser native selection over selected elements and is hidden to the user.\n\t * This way, no native selection UI artifacts are displayed to the user and selection over elements can be\n\t * represented in other way, for example by applying proper CSS class.\n\t *\n\t * Additionally fake's selection label can be provided. It will be used to describe fake selection in DOM\n\t * (and be  properly handled by screen readers).\n\t *\n\t *\t\t// Creates fake selection with label.\n\t *\t\tconst selection = new DocumentSelection( range, { fake: true, label: 'foo' } );\n\t *\n\t * @param {module:engine/view/selection~Selectable} [selectable=null]\n\t * @param {Number|'before'|'end'|'after'|'on'|'in'} [placeOrOffset] Offset or place when selectable is an `Item`.\n\t * @param {Object} [options]\n\t * @param {Boolean} [options.backward] Sets this selection instance to be backward.\n\t * @param {Boolean} [options.fake] Sets this selection instance to be marked as `fake`.\n\t * @param {String} [options.label] Label for the fake selection.\n\t */\n\tconstructor( selectable = null, placeOrOffset, options ) {\n\t\t/**\n\t\t * Selection is used internally (`DocumentSelection` is a proxy to that selection).\n\t\t *\n\t\t * @private\n\t\t * @member {module:engine/view/selection~Selection}\n\t\t */\n\t\tthis._selection = new Selection();\n\n\t\t// Delegate change event to be fired on DocumentSelection instance.\n\t\tthis._selection.delegate( 'change' ).to( this );\n\n\t\t// Set selection data.\n\t\tthis._selection.setTo( selectable, placeOrOffset, options );\n\t}\n\n\t/**\n\t * Returns true if selection instance is marked as `fake`.\n\t *\n\t * @see #_setTo\n\t * @returns {Boolean}\n\t */\n\tget isFake() {\n\t\treturn this._selection.isFake;\n\t}\n\n\t/**\n\t * Returns fake selection label.\n\t *\n\t * @see #_setTo\n\t * @returns {String}\n\t */\n\tget fakeSelectionLabel() {\n\t\treturn this._selection.fakeSelectionLabel;\n\t}\n\n\t/**\n\t * Selection anchor. Anchor may be described as a position where the selection starts. Together with\n\t * {@link #focus focus} they define the direction of selection, which is important\n\t * when expanding/shrinking selection. Anchor is always the start or end of the most recent added range.\n\t * It may be a bit unintuitive when there are multiple ranges in selection.\n\t *\n\t * @see #focus\n\t * @type {module:engine/view/position~Position}\n\t */\n\tget anchor() {\n\t\treturn this._selection.anchor;\n\t}\n\n\t/**\n\t * Selection focus. Focus is a position where the selection ends.\n\t *\n\t * @see #anchor\n\t * @type {module:engine/view/position~Position}\n\t */\n\tget focus() {\n\t\treturn this._selection.focus;\n\t}\n\n\t/**\n\t * Returns whether the selection is collapsed. Selection is collapsed when there is exactly one range which is\n\t * collapsed.\n\t *\n\t * @type {Boolean}\n\t */\n\tget isCollapsed() {\n\t\treturn this._selection.isCollapsed;\n\t}\n\n\t/**\n\t * Returns number of ranges in selection.\n\t *\n\t * @type {Number}\n\t */\n\tget rangeCount() {\n\t\treturn this._selection.rangeCount;\n\t}\n\n\t/**\n\t * Specifies whether the {@link #focus} precedes {@link #anchor}.\n\t *\n\t * @type {Boolean}\n\t */\n\tget isBackward() {\n\t\treturn this._selection.isBackward;\n\t}\n\n\t/**\n\t * {@link module:engine/view/editableelement~EditableElement EditableElement} instance that contains this selection, or `null`\n\t * if the selection is not inside an editable element.\n\t *\n\t * @type {module:engine/view/editableelement~EditableElement|null}\n\t */\n\tget editableElement() {\n\t\treturn this._selection.editableElement;\n\t}\n\n\t/**\n\t * Used for the compatibility with the {@link module:engine/view/selection~Selection#isEqual} method.\n\t *\n\t * @protected\n\t */\n\tget _ranges() {\n\t\treturn this._selection._ranges;\n\t}\n\n\t/**\n\t * Returns an iterable that contains copies of all ranges added to the selection.\n\t *\n\t * @returns {Iterable.<module:engine/view/range~Range>}\n\t */\n\t* getRanges() {\n\t\tyield* this._selection.getRanges();\n\t}\n\n\t/**\n\t * Returns copy of the first range in the selection. First range is the one which\n\t * {@link module:engine/view/range~Range#start start} position {@link module:engine/view/position~Position#isBefore is before} start\n\t * position of all other ranges (not to confuse with the first range added to the selection).\n\t * Returns `null` if no ranges are added to selection.\n\t *\n\t * @returns {module:engine/view/range~Range|null}\n\t */\n\tgetFirstRange() {\n\t\treturn this._selection.getFirstRange();\n\t}\n\n\t/**\n\t * Returns copy of the last range in the selection. Last range is the one which {@link module:engine/view/range~Range#end end}\n\t * position {@link module:engine/view/position~Position#isAfter is after} end position of all other ranges (not to confuse\n\t * with the last range added to the selection). Returns `null` if no ranges are added to selection.\n\t *\n\t * @returns {module:engine/view/range~Range|null}\n\t */\n\tgetLastRange() {\n\t\treturn this._selection.getLastRange();\n\t}\n\n\t/**\n\t * Returns copy of the first position in the selection. First position is the position that\n\t * {@link module:engine/view/position~Position#isBefore is before} any other position in the selection ranges.\n\t * Returns `null` if no ranges are added to selection.\n\t *\n\t * @returns {module:engine/view/position~Position|null}\n\t */\n\tgetFirstPosition() {\n\t\treturn this._selection.getFirstPosition();\n\t}\n\n\t/**\n\t * Returns copy of the last position in the selection. Last position is the position that\n\t * {@link module:engine/view/position~Position#isAfter is after} any other position in the selection ranges.\n\t * Returns `null` if no ranges are added to selection.\n\t *\n\t * @returns {module:engine/view/position~Position|null}\n\t */\n\tgetLastPosition() {\n\t\treturn this._selection.getLastPosition();\n\t}\n\n\t/**\n\t * Returns the selected element. {@link module:engine/view/element~Element Element} is considered as selected if there is only\n\t * one range in the selection, and that range contains exactly one element.\n\t * Returns `null` if there is no selected element.\n\t *\n\t * @returns {module:engine/view/element~Element|null}\n\t */\n\tgetSelectedElement() {\n\t\treturn this._selection.getSelectedElement();\n\t}\n\n\t/**\n\t * Checks whether, this selection is equal to given selection. Selections are equal if they have same directions,\n\t * same number of ranges and all ranges from one selection equal to a range from other selection.\n\t *\n\t * @param {module:engine/view/selection~Selection|module:engine/view/documentselection~DocumentSelection} otherSelection\n\t * Selection to compare with.\n\t * @returns {Boolean} `true` if selections are equal, `false` otherwise.\n\t */\n\tisEqual( otherSelection ) {\n\t\treturn this._selection.isEqual( otherSelection );\n\t}\n\n\t/**\n\t * Checks whether this selection is similar to given selection. Selections are similar if they have same directions, same\n\t * number of ranges, and all {@link module:engine/view/range~Range#getTrimmed trimmed} ranges from one selection are\n\t * equal to any trimmed range from other selection.\n\t *\n\t * @param {module:engine/view/selection~Selection|module:engine/view/documentselection~DocumentSelection} otherSelection\n\t * Selection to compare with.\n\t * @returns {Boolean} `true` if selections are similar, `false` otherwise.\n\t */\n\tisSimilar( otherSelection ) {\n\t\treturn this._selection.isSimilar( otherSelection );\n\t}\n\n\t/**\n\t * Checks whether this object is of the given type.\n\t *\n\t *\t\tdocSelection.is( 'selection' ); // -> true\n\t *\t\tdocSelection.is( 'documentSelection' ); // -> true\n\t *\t\tdocSelection.is( 'view:selection' ); // -> true\n\t *\t\tdocSelection.is( 'view:documentSelection' ); // -> true\n\t *\n\t *\t\tdocSelection.is( 'model:documentSelection' ); // -> false\n\t *\t\tdocSelection.is( 'element' ); // -> false\n\t *\t\tdocSelection.is( 'node' ); // -> false\n\t *\n\t * {@link module:engine/view/node~Node#is Check the entire list of view objects} which implement the `is()` method.\n\t *\n\t * @param {String} type\n\t * @returns {Boolean}\n\t */\n\tis( type ) {\n\t\treturn type === 'selection' ||\n\t\t\ttype == 'documentSelection' ||\n\t\t\ttype == 'view:selection' ||\n\t\t\ttype == 'view:documentSelection';\n\t}\n\n\t/**\n\t * Sets this selection's ranges and direction to the specified location based on the given\n\t * {@link module:engine/view/selection~Selectable selectable}.\n\t *\n\t *\t\t// Sets selection to the given range.\n\t *\t\tconst range = writer.createRange( start, end );\n\t *\t\tdocumentSelection._setTo( range );\n\t *\n\t *\t\t// Sets selection to given ranges.\n\t * \t\tconst ranges = [ writer.createRange( start1, end2 ), writer.createRange( start2, end2 ) ];\n\t *\t\tdocumentSelection._setTo( range );\n\t *\n\t *\t\t// Sets selection to the other selection.\n\t *\t\tconst otherSelection = writer.createSelection();\n\t *\t\tdocumentSelection._setTo( otherSelection );\n\t *\n\t * \t\t// Sets collapsed selection at the given position.\n\t *\t\tconst position = writer.createPositionAt( root, offset );\n\t *\t\tdocumentSelection._setTo( position );\n\t *\n\t * \t\t// Sets collapsed selection at the position of given item and offset.\n\t *\t\tdocumentSelection._setTo( paragraph, offset );\n\t *\n\t * Creates a range inside an {@link module:engine/view/element~Element element} which starts before the first child of\n\t * that element and ends after the last child of that element.\n\t *\n\t *\t\tdocumentSelection._setTo( paragraph, 'in' );\n\t *\n\t * Creates a range on an {@link module:engine/view/item~Item item} which starts before the item and ends just after the item.\n\t *\n\t *\t\tdocumentSelection._setTo( paragraph, 'on' );\n\t *\n\t * \t\t// Clears selection. Removes all ranges.\n\t *\t\tdocumentSelection._setTo( null );\n\t *\n\t * `Selection#_setTo()` method allow passing additional options (`backward`, `fake` and `label`) as the last argument.\n\t *\n\t *\t\t// Sets selection as backward.\n\t *\t\tdocumentSelection._setTo( range, { backward: true } );\n\t *\n\t * Fake selection does not render as browser native selection over selected elements and is hidden to the user.\n\t * This way, no native selection UI artifacts are displayed to the user and selection over elements can be\n\t * represented in other way, for example by applying proper CSS class.\n\t *\n\t * Additionally fake's selection label can be provided. It will be used to des cribe fake selection in DOM\n\t * (and be  properly handled by screen readers).\n\t *\n\t *\t\t// Creates fake selection with label.\n\t *\t\tdocumentSelection._setTo( range, { fake: true, label: 'foo' } );\n\t *\n\t * @protected\n\t * @fires change\n\t * @param {module:engine/view/selection~Selectable} selectable\n\t * @param {Number|'before'|'end'|'after'|'on'|'in'} [placeOrOffset] Sets place or offset of the selection.\n\t * @param {Object} [options]\n\t * @param {Boolean} [options.backward] Sets this selection instance to be backward.\n\t * @param {Boolean} [options.fake] Sets this selection instance to be marked as `fake`.\n\t * @param {String} [options.label] Label for the fake selection.\n\t */\n\t_setTo( selectable, placeOrOffset, options ) {\n\t\tthis._selection.setTo( selectable, placeOrOffset, options );\n\t}\n\n\t/**\n\t * Moves {@link #focus} to the specified location.\n\t *\n\t * The location can be specified in the same form as {@link module:engine/view/view~View#createPositionAt view.createPositionAt()}\n\t * parameters.\n\t *\n\t * @protected\n\t * @fires change\n\t * @param {module:engine/view/item~Item|module:engine/view/position~Position} itemOrPosition\n\t * @param {Number|'end'|'before'|'after'} [offset] Offset or one of the flags. Used only when\n\t * first parameter is a {@link module:engine/view/item~Item view item}.\n\t */\n\t_setFocus( itemOrPosition, offset ) {\n\t\tthis._selection.setFocus( itemOrPosition, offset );\n\t}\n\n\t/**\n\t * Fired whenever selection ranges are changed through {@link ~DocumentSelection Selection API}.\n\t *\n\t * @event change\n\t */\n}\n\nmix( DocumentSelection, EmitterMixin );\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module engine/view/document\n */\n\nimport DocumentSelection from './documentselection';\nimport Collection from '@ckeditor/ckeditor5-utils/src/collection';\nimport mix from '@ckeditor/ckeditor5-utils/src/mix';\nimport ObservableMixin from '@ckeditor/ckeditor5-utils/src/observablemixin';\n\n// @if CK_DEBUG_ENGINE // const { logDocument } = require( '../dev-utils/utils' );\n\n/**\n * Document class creates an abstract layer over the content editable area, contains a tree of view elements and\n * {@link module:engine/view/documentselection~DocumentSelection view selection} associated with this document.\n *\n * @mixes module:utils/observablemixin~ObservableMixin\n */\nexport default class Document {\n\t/**\n\t * Creates a Document instance.\n\t *\n\t * @param {module:engine/view/stylesmap~StylesProcessor} stylesProcessor The styles processor instance.\n\t */\n\tconstructor( stylesProcessor ) {\n\t\t/**\n\t\t * Selection done on this document.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:engine/view/documentselection~DocumentSelection} module:engine/view/document~Document#selection\n\t\t */\n\t\tthis.selection = new DocumentSelection();\n\n\t\t/**\n\t\t * Roots of the view tree. Collection of the {@link module:engine/view/element~Element view elements}.\n\t\t *\n\t\t * View roots are created as a result of binding between {@link module:engine/view/document~Document#roots} and\n\t\t * {@link module:engine/model/document~Document#roots} and this is handled by\n\t\t * {@link module:engine/controller/editingcontroller~EditingController}, so to create view root we need to create\n\t\t * model root using {@link module:engine/model/document~Document#createRoot}.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:utils/collection~Collection} module:engine/view/document~Document#roots\n\t\t */\n\t\tthis.roots = new Collection( { idProperty: 'rootName' } );\n\n\t\t/**\n\t\t * The styles processor instance used by this document when normalizing styles.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:engine/view/stylesmap~StylesProcessor}\n\t\t */\n\t\tthis.stylesProcessor = stylesProcessor;\n\n\t\t/**\n\t\t * Defines whether document is in read-only mode.\n\t\t *\n\t\t * When document is read-ony then all roots are read-only as well and caret placed inside this root is hidden.\n\t\t *\n\t\t * @observable\n\t\t * @member {Boolean} #isReadOnly\n\t\t */\n\t\tthis.set( 'isReadOnly', false );\n\n\t\t/**\n\t\t * True if document is focused.\n\t\t *\n\t\t * This property is updated by the {@link module:engine/view/observer/focusobserver~FocusObserver}.\n\t\t * If the {@link module:engine/view/observer/focusobserver~FocusObserver} is disabled this property will not change.\n\t\t *\n\t\t * @readonly\n\t\t * @observable\n\t\t * @member {Boolean} module:engine/view/document~Document#isFocused\n\t\t */\n\t\tthis.set( 'isFocused', false );\n\n\t\t/**\n\t\t * True if composition is in progress inside the document.\n\t\t *\n\t\t * This property is updated by the {@link module:engine/view/observer/compositionobserver~CompositionObserver}.\n\t\t * If the {@link module:engine/view/observer/compositionobserver~CompositionObserver} is disabled this property will not change.\n\t\t *\n\t\t * @readonly\n\t\t * @observable\n\t\t * @member {Boolean} module:engine/view/document~Document#isComposing\n\t\t */\n\t\tthis.set( 'isComposing', false );\n\n\t\t/**\n\t\t * Post-fixer callbacks registered to the view document.\n\t\t *\n\t\t * @private\n\t\t * @member {Set}\n\t\t */\n\t\tthis._postFixers = new Set();\n\t}\n\n\t/**\n\t * Gets a {@link module:engine/view/document~Document#roots view root element} with the specified name. If the name is not\n\t * specific \"main\" root is returned.\n\t *\n\t * @param {String} [name='main'] Name of the root.\n\t * @returns {module:engine/view/rooteditableelement~RootEditableElement|null} The view root element with the specified name\n\t * or null when there is no root of given name.\n\t */\n\tgetRoot( name = 'main' ) {\n\t\treturn this.roots.get( name );\n\t}\n\n\t/**\n\t * Allows registering post-fixer callbacks. A post-fixers mechanism allows to update the view tree just before it is rendered\n\t * to the DOM.\n\t *\n\t * Post-fixers are executed right after all changes from the outermost change block were applied but\n\t * before the {@link module:engine/view/view~View#event:render render event} is fired. If a post-fixer callback made\n\t * a change, it should return `true`. When this happens, all post-fixers are fired again to check if something else should\n\t * not be fixed in the new document tree state.\n\t *\n\t * View post-fixers are useful when you want to apply some fixes whenever the view structure changes. Keep in mind that\n\t * changes executed in a view post-fixer should not break model-view mapping.\n\t *\n\t * The types of changes which should be safe:\n\t *\n\t * * adding or removing attribute from elements,\n\t * * changes inside of {@link module:engine/view/uielement~UIElement UI elements},\n\t * * {@link module:engine/model/differ~Differ#refreshItem marking some of the model elements to be re-converted}.\n\t *\n\t * Try to avoid changes which touch view structure:\n\t *\n\t * * you should not add or remove nor wrap or unwrap any view elements,\n\t * * you should not change the editor data model in a view post-fixer.\n\t *\n\t * As a parameter, a post-fixer callback receives a {@link module:engine/view/downcastwriter~DowncastWriter downcast writer}.\n\t *\n\t * Typically, a post-fixer will look like this:\n\t *\n\t *\t\teditor.editing.view.document.registerPostFixer( writer => {\n\t *\t\t\tif ( checkSomeCondition() ) {\n\t *\t\t\t\twriter.doSomething();\n\t *\n\t *\t\t\t\t// Let other post-fixers know that something changed.\n\t *\t\t\t\treturn true;\n\t *\t\t\t}\n\t *\t\t} );\n\t *\n\t * Note that nothing happens right after you register a post-fixer (e.g. execute such a code in the console).\n\t * That is because adding a post-fixer does not execute it.\n\t * The post-fixer will be executed as soon as any change in the document needs to cause its rendering.\n\t * If you want to re-render the editor's view after registering the post-fixer then you should do it manually by calling\n\t * {@link module:engine/view/view~View#forceRender `view.forceRender()`}.\n\t *\n\t * If you need to register a callback which is executed when DOM elements are already updated,\n\t * use {@link module:engine/view/view~View#event:render render event}.\n\t *\n\t * @param {Function} postFixer\n\t */\n\tregisterPostFixer( postFixer ) {\n\t\tthis._postFixers.add( postFixer );\n\t}\n\n\t/**\n\t * Destroys this instance. Makes sure that all observers are destroyed and listeners removed.\n\t */\n\tdestroy() {\n\t\tthis.roots.map( root => root.destroy() );\n\t\tthis.stopListening();\n\t}\n\n\t/**\n\t * Performs post-fixer loops. Executes post-fixer callbacks as long as none of them has done any changes to the model.\n\t *\n\t * @protected\n\t * @param {module:engine/view/downcastwriter~DowncastWriter} writer\n\t */\n\t_callPostFixers( writer ) {\n\t\tlet wasFixed = false;\n\n\t\tdo {\n\t\t\tfor ( const callback of this._postFixers ) {\n\t\t\t\twasFixed = callback( writer );\n\n\t\t\t\tif ( wasFixed ) {\n\t\t\t\t\tbreak;\n\t\t\t\t}\n\t\t\t}\n\t\t} while ( wasFixed );\n\t}\n\n\t/**\n\t * Event fired whenever document content layout changes. It is fired whenever content is\n\t * {@link module:engine/view/view~View#event:render rendered}, but should be also fired by observers in case of\n\t * other actions which may change layout, for instance when image loads.\n\t *\n\t * @event layoutChanged\n\t */\n\n\t// @if CK_DEBUG_ENGINE // log( version ) {\n\t// @if CK_DEBUG_ENGINE //\tlogDocument( this, version );\n\t// @if CK_DEBUG_ENGINE // }\n}\n\nmix( Document, ObservableMixin );\n\n/**\n * Enum representing type of the change.\n *\n * Possible values:\n *\n * * `children` - for child list changes,\n * * `attributes` - for element attributes changes,\n * * `text` - for text nodes changes.\n *\n * @typedef {String} module:engine/view/document~ChangeType\n */\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module engine/view/attributeelement\n */\n\nimport Element from './element';\nimport CKEditorError from '@ckeditor/ckeditor5-utils/src/ckeditorerror';\n\n// Default attribute priority.\nconst DEFAULT_PRIORITY = 10;\n\n/**\n * Attribute elements are used to represent formatting elements in the view (think – `<b>`, `<span style=\"font-size: 2em\">`, etc.).\n * Most often they are created when downcasting model text attributes.\n *\n * Editing engine does not define a fixed HTML DTD. This is why a feature developer needs to choose between various\n * types (container element, {@link module:engine/view/attributeelement~AttributeElement attribute element},\n * {@link module:engine/view/emptyelement~EmptyElement empty element}, etc) when developing a feature.\n *\n * To create a new attribute element instance use the\n * {@link module:engine/view/downcastwriter~DowncastWriter#createAttributeElement `DowncastWriter#createAttributeElement()`} method.\n *\n * @extends module:engine/view/element~Element\n */\nexport default class AttributeElement extends Element {\n\t/**\n\t * Creates an attribute element.\n\t *\n\t * @see module:engine/view/downcastwriter~DowncastWriter#createAttributeElement\n\t * @see module:engine/view/element~Element\n\t * @protected\n\t * @param {module:engine/view/document~Document} document The document instance to which this element belongs.\n\t * @param {String} name Node name.\n\t * @param {Object|Iterable} [attrs] Collection of attributes.\n\t * @param {module:engine/view/node~Node|Iterable.<module:engine/view/node~Node>} [children]\n\t * A list of nodes to be inserted into created element.\n\t */\n\tconstructor( document, name, attrs, children ) {\n\t\tsuper( document, name, attrs, children );\n\n\t\t/**\n\t\t * Returns block {@link module:engine/view/filler filler} offset or `null` if block filler is not needed.\n\t\t *\n\t\t * @method #getFillerOffset\n\t\t * @returns {Number|null} Block filler offset or `null` if block filler is not needed.\n\t\t */\n\t\tthis.getFillerOffset = getFillerOffset;\n\n\t\t/**\n\t\t * Element priority. Decides in what order elements are wrapped by {@link module:engine/view/downcastwriter~DowncastWriter}.\n\t\t *\n\t\t * @protected\n\t\t * @member {Number}\n\t\t */\n\t\tthis._priority = DEFAULT_PRIORITY;\n\n\t\t/**\n\t\t * Element identifier. If set, it is used by {@link module:engine/view/element~Element#isSimilar},\n\t\t * and then two elements are considered similar if, and only if they have the same `_id`.\n\t\t *\n\t\t * @protected\n\t\t * @member {String|Number}\n\t\t */\n\t\tthis._id = null;\n\n\t\t/**\n\t\t * Keeps all the attribute elements that have the same {@link module:engine/view/attributeelement~AttributeElement#id ids}\n\t\t * and still exist in the view tree.\n\t\t *\n\t\t * This property is managed by {@link module:engine/view/downcastwriter~DowncastWriter}.\n\t\t *\n\t\t * @protected\n\t\t * @member {Set.<module:engine/view/attributeelement~AttributeElement>|null}\n\t\t */\n\t\tthis._clonesGroup = null;\n\t}\n\n\t/**\n\t * Element priority. Decides in what order elements are wrapped by {@link module:engine/view/downcastwriter~DowncastWriter}.\n\t *\n\t * @readonly\n\t * @type {Number}\n\t */\n\tget priority() {\n\t\treturn this._priority;\n\t}\n\n\t/**\n\t * Element identifier. If set, it is used by {@link module:engine/view/element~Element#isSimilar},\n\t * and then two elements are considered similar if, and only if they have the same `id`.\n\t *\n\t * @readonly\n\t * @type {String|Number}\n\t */\n\tget id() {\n\t\treturn this._id;\n\t}\n\n\t/**\n\t * Returns all {@link module:engine/view/attributeelement~AttributeElement attribute elements} that has the\n\t * same {@link module:engine/view/attributeelement~AttributeElement#id id} and are in the view tree (were not removed).\n\t *\n\t * Note: If this element has been removed from the tree, returned set will not include it.\n\t *\n\t * Throws {@link module:utils/ckeditorerror~CKEditorError attribute-element-get-elements-with-same-id-no-id}\n\t * if this element has no `id`.\n\t *\n\t * @returns {Set.<module:engine/view/attributeelement~AttributeElement>} Set containing all the attribute elements\n\t * with the same `id` that were added and not removed from the view tree.\n\t */\n\tgetElementsWithSameId() {\n\t\tif ( this.id === null ) {\n\t\t\t/**\n\t\t\t * Cannot get elements with the same id for an attribute element without id.\n\t\t\t *\n\t\t\t * @error attribute-element-get-elements-with-same-id-no-id\n\t\t\t */\n\t\t\tthrow new CKEditorError(\n\t\t\t\t'attribute-element-get-elements-with-same-id-no-id',\n\t\t\t\tthis\n\t\t\t);\n\t\t}\n\n\t\treturn new Set( this._clonesGroup );\n\t}\n\n\t/**\n\t * Checks whether this object is of the given.\n\t *\n\t *\t\tattributeElement.is( 'attributeElement' ); // -> true\n\t *\t\tattributeElement.is( 'element' ); // -> true\n\t *\t\tattributeElement.is( 'node' ); // -> true\n\t *\t\tattributeElement.is( 'view:attributeElement' ); // -> true\n\t *\t\tattributeElement.is( 'view:element' ); // -> true\n\t *\t\tattributeElement.is( 'view:node' ); // -> true\n\t *\n\t *\t\tattributeElement.is( 'model:element' ); // -> false\n\t *\t\tattributeElement.is( 'documentFragment' ); // -> false\n\t *\n\t * Assuming that the object being checked is an attribute element, you can also check its\n\t * {@link module:engine/view/attributeelement~AttributeElement#name name}:\n\t *\n\t *\t\tattributeElement.is( 'element', 'b' ); // -> true if this is a bold element\n\t *\t\tattributeElement.is( 'attributeElement', 'b' ); // -> same as above\n\t *\t\ttext.is( 'element', 'b' ); -> false\n\t *\n\t * {@link module:engine/view/node~Node#is Check the entire list of view objects} which implement the `is()` method.\n\t *\n\t * @param {String} type Type to check.\n\t * @param {String} [name] Element name.\n\t * @returns {Boolean}\n\t */\n\tis( type, name = null ) {\n\t\tif ( !name ) {\n\t\t\treturn type === 'attributeElement' || type === 'view:attributeElement' ||\n\t\t\t\t// From super.is(). This is highly utilised method and cannot call super. See ckeditor/ckeditor5#6529.\n\t\t\t\ttype === 'element' || type === 'view:element' ||\n\t\t\t\ttype === 'node' || type === 'view:node';\n\t\t} else {\n\t\t\treturn name === this.name && (\n\t\t\t\ttype === 'attributeElement' || type === 'view:attributeElement' ||\n\t\t\t\t// From super.is(). This is highly utilised method and cannot call super. See ckeditor/ckeditor5#6529.\n\t\t\t\ttype === 'element' || type === 'view:element'\n\t\t\t);\n\t\t}\n\t}\n\n\t/**\n\t * Checks if this element is similar to other element.\n\t *\n\t * If none of elements has set {@link module:engine/view/attributeelement~AttributeElement#id}, then both elements\n\t * should have the same name, attributes and priority to be considered as similar. Two similar elements can contain\n\t * different set of children nodes.\n\t *\n\t * If at least one element has {@link module:engine/view/attributeelement~AttributeElement#id} set, then both\n\t * elements have to have the same {@link module:engine/view/attributeelement~AttributeElement#id} value to be\n\t * considered similar.\n\t *\n\t * Similarity is important for {@link module:engine/view/downcastwriter~DowncastWriter}. For example:\n\t *\n\t * * two following similar elements can be merged together into one, longer element,\n\t * * {@link module:engine/view/downcastwriter~DowncastWriter#unwrap} checks similarity of passed element and processed element to\n\t * decide whether processed element should be unwrapped,\n\t * * etc.\n\t *\n\t * @param {module:engine/view/element~Element} otherElement\n\t * @returns {Boolean}\n\t */\n\tisSimilar( otherElement ) {\n\t\t// If any element has an `id` set, just compare the ids.\n\t\tif ( this.id !== null || otherElement.id !== null ) {\n\t\t\treturn this.id === otherElement.id;\n\t\t}\n\n\t\treturn super.isSimilar( otherElement ) && this.priority == otherElement.priority;\n\t}\n\n\t/**\n\t * Clones provided element with priority.\n\t *\n\t * @protected\n\t * @param {Boolean} deep If set to `true` clones element and all its children recursively. When set to `false`,\n\t * element will be cloned without any children.\n\t * @returns {module:engine/view/attributeelement~AttributeElement} Clone of this element.\n\t */\n\t_clone( deep ) {\n\t\tconst cloned = super._clone( deep );\n\n\t\t// Clone priority too.\n\t\tcloned._priority = this._priority;\n\n\t\t// And id too.\n\t\tcloned._id = this._id;\n\n\t\treturn cloned;\n\t}\n}\n\n/**\n * Default attribute priority.\n *\n * @member {Number} module:engine/view/attributeelement~AttributeElement.DEFAULT_PRIORITY\n */\nAttributeElement.DEFAULT_PRIORITY = DEFAULT_PRIORITY;\n\n// Returns block {@link module:engine/view/filler~Filler filler} offset or `null` if block filler is not needed.\n//\n// @returns {Number|null} Block filler offset or `null` if block filler is not needed.\nfunction getFillerOffset() {\n\t// <b>foo</b> does not need filler.\n\tif ( nonUiChildrenCount( this ) ) {\n\t\treturn null;\n\t}\n\n\tlet element = this.parent;\n\n\t// <p><b></b></p> needs filler -> <p><b><br></b></p>\n\twhile ( element && element.is( 'attributeElement' ) ) {\n\t\tif ( nonUiChildrenCount( element ) > 1 ) {\n\t\t\treturn null;\n\t\t}\n\n\t\telement = element.parent;\n\t}\n\n\tif ( !element || nonUiChildrenCount( element ) > 1 ) {\n\t\treturn null;\n\t}\n\n\t// Render block filler at the end of element (after all ui elements).\n\treturn this.childCount;\n}\n\n// Returns total count of children that are not {@link module:engine/view/uielement~UIElement UIElements}.\n//\n// @param {module:engine/view/element~Element} element\n// @returns {Number}\nfunction nonUiChildrenCount( element ) {\n\treturn Array.from( element.getChildren() ).filter( element => !element.is( 'uiElement' ) ).length;\n}\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module engine/view/emptyelement\n */\n\nimport Element from './element';\nimport CKEditorError from '@ckeditor/ckeditor5-utils/src/ckeditorerror';\nimport Node from './node';\n\n/**\n * Empty element class. It is used to represent elements that cannot contain any child nodes (for example `<img>` elements).\n *\n * To create a new empty element use the\n * {@link module:engine/view/downcastwriter~DowncastWriter#createEmptyElement `downcastWriter#createEmptyElement()`} method.\n *\n * @extends module:engine/view/element~Element\n */\nexport default class EmptyElement extends Element {\n\t/**\n\t * Creates new instance of EmptyElement.\n\t *\n\t * Throws {@link module:utils/ckeditorerror~CKEditorError CKEditorError} `view-emptyelement-cannot-add` when third parameter is passed,\n\t * to inform that usage of EmptyElement is incorrect (adding child nodes to EmptyElement is forbidden).\n\t *\n\t * @see module:engine/view/downcastwriter~DowncastWriter#createEmptyElement\n\t * @protected\n\t * @param {module:engine/view/document~Document} document The document instance to which this element belongs.\n\t * @param {String} name Node name.\n\t * @param {Object|Iterable} [attrs] Collection of attributes.\n\t * @param {module:engine/view/node~Node|Iterable.<module:engine/view/node~Node>} [children]\n\t * A list of nodes to be inserted into created element.\n\t */\n\tconstructor( document, name, attrs, children ) {\n\t\tsuper( document, name, attrs, children );\n\n\t\t/**\n\t\t * Returns `null` because filler is not needed for EmptyElements.\n\t\t *\n\t\t * @method #getFillerOffset\n\t\t * @returns {null} Always returns null.\n\t\t */\n\t\tthis.getFillerOffset = getFillerOffset;\n\t}\n\n\t/**\n\t * Checks whether this object is of the given.\n\t *\n\t *\t\temptyElement.is( 'emptyElement' ); // -> true\n\t *\t\temptyElement.is( 'element' ); // -> true\n\t *\t\temptyElement.is( 'node' ); // -> true\n\t *\t\temptyElement.is( 'view:emptyElement' ); // -> true\n\t *\t\temptyElement.is( 'view:element' ); // -> true\n\t *\t\temptyElement.is( 'view:node' ); // -> true\n\t *\n\t *\t\temptyElement.is( 'model:element' ); // -> false\n\t *\t\temptyElement.is( 'documentFragment' ); // -> false\n\t *\n\t * Assuming that the object being checked is an empty element, you can also check its\n\t * {@link module:engine/view/emptyelement~EmptyElement#name name}:\n\t *\n\t *\t\temptyElement.is( 'element', 'img' ); // -> true if this is a img element\n\t *\t\temptyElement.is( 'emptyElement', 'img' ); // -> same as above\n\t *\t\ttext.is( 'element', 'img' ); -> false\n\t *\n\t * {@link module:engine/view/node~Node#is Check the entire list of view objects} which implement the `is()` method.\n\t *\n\t * @param {String} type Type to check.\n\t * @param {String} [name] Element name.\n\t * @returns {Boolean}\n\t */\n\tis( type, name = null ) {\n\t\tif ( !name ) {\n\t\t\treturn type === 'emptyElement' || type === 'view:emptyElement' ||\n\t\t\t\t// From super.is(). This is highly utilised method and cannot call super. See ckeditor/ckeditor5#6529.\n\t\t\t\ttype === 'element' || type === 'view:element' ||\n\t\t\t\ttype === 'node' || type === 'view:node';\n\t\t} else {\n\t\t\treturn name === this.name && (\n\t\t\t\ttype === 'emptyElement' || type === 'view:emptyElement' ||\n\t\t\t\ttype === 'element' || type === 'view:element'\n\t\t\t);\n\t\t}\n\t}\n\n\t/**\n\t * Overrides {@link module:engine/view/element~Element#_insertChild} method.\n\t * Throws {@link module:utils/ckeditorerror~CKEditorError CKEditorError} `view-emptyelement-cannot-add` to prevent\n\t * adding any child nodes to EmptyElement.\n\t *\n\t * @protected\n\t */\n\t_insertChild( index, nodes ) {\n\t\tif ( nodes && ( nodes instanceof Node || Array.from( nodes ).length > 0 ) ) {\n\t\t\t/**\n\t\t\t * Cannot add children to {@link module:engine/view/emptyelement~EmptyElement}.\n\t\t\t *\n\t\t\t * @error view-emptyelement-cannot-add\n\t\t\t */\n\t\t\tthrow new CKEditorError(\n\t\t\t\t'view-emptyelement-cannot-add',\n\t\t\t\t[ this, nodes ]\n\t\t\t);\n\t\t}\n\t}\n}\n\n// Returns `null` because block filler is not needed for EmptyElements.\n//\n// @returns {null}\nfunction getFillerOffset() {\n\treturn null;\n}\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/* globals navigator:false */\n\n/**\n * @module utils/env\n */\n\nconst userAgent = navigator.userAgent.toLowerCase();\n\n/**\n * A namespace containing environment and browser information.\n *\n * @namespace\n */\nconst env = {\n\t/**\n\t * Indicates that the application is running on Macintosh.\n\t *\n\t * @static\n\t * @type {Boolean}\n\t */\n\tisMac: isMac( userAgent ),\n\n\t/**\n\t * Indicates that the application is running in Firefox (Gecko).\n\t *\n\t * @static\n\t * @type {Boolean}\n\t */\n\tisGecko: isGecko( userAgent ),\n\n\t/**\n\t * Indicates that the application is running in Safari.\n\t *\n\t * @static\n\t * @type {Boolean}\n\t */\n\tisSafari: isSafari( userAgent ),\n\n\t/**\n\t * Indicates that the application is running on Android mobile device.\n\t *\n\t * @static\n\t * @type {Boolean}\n\t */\n\tisAndroid: isAndroid( userAgent ),\n\n\t/**\n\t * Indicates that the application is running in a browser using the Blink engine.\n\t *\n\t * @static\n\t * @type {Boolean}\n\t */\n\tisBlink: isBlink( userAgent ),\n\n\t/**\n\t * Environment features information.\n\t *\n\t * @memberOf module:utils/env~env\n\t * @namespace\n\t */\n\tfeatures: {\n\t\t/**\n\t\t * Indicates that the environment supports ES2018 Unicode property escapes — like `\\p{P}` or `\\p{L}`.\n\t\t * More information about unicode properties might be found\n\t\t * [in Unicode Standard Annex #44](https://www.unicode.org/reports/tr44/#GC_Values_Table).\n\t\t *\n\t\t * @type {Boolean}\n\t\t */\n\t\tisRegExpUnicodePropertySupported: isRegExpUnicodePropertySupported()\n\t}\n};\n\nexport default env;\n\n/**\n * Checks if User Agent represented by the string is running on Macintosh.\n *\n * @param {String} userAgent **Lowercase** `navigator.userAgent` string.\n * @returns {Boolean} Whether User Agent is running on Macintosh or not.\n */\nexport function isMac( userAgent ) {\n\treturn userAgent.indexOf( 'macintosh' ) > -1;\n}\n\n/**\n * Checks if User Agent represented by the string is Firefox (Gecko).\n *\n * @param {String} userAgent **Lowercase** `navigator.userAgent` string.\n * @returns {Boolean} Whether User Agent is Firefox or not.\n */\nexport function isGecko( userAgent ) {\n\treturn !!userAgent.match( /gecko\\/\\d+/ );\n}\n\n/**\n * Checks if User Agent represented by the string is Safari.\n *\n * @param {String} userAgent **Lowercase** `navigator.userAgent` string.\n * @returns {Boolean} Whether User Agent is Safari or not.\n */\nexport function isSafari( userAgent ) {\n\treturn userAgent.indexOf( ' applewebkit/' ) > -1 && userAgent.indexOf( 'chrome' ) === -1;\n}\n\n/**\n * Checks if User Agent represented by the string is Android mobile device.\n *\n * @param {String} userAgent **Lowercase** `navigator.userAgent` string.\n * @returns {Boolean} Whether User Agent is Safari or not.\n */\nexport function isAndroid( userAgent ) {\n\treturn userAgent.indexOf( 'android' ) > -1;\n}\n\n/**\n * Checks if User Agent represented by the string is Blink engine.\n *\n * @param {String} userAgent **Lowercase** `navigator.userAgent` string.\n * @returns {Boolean} Whether User Agent is Blink engine or not.\n */\nexport function isBlink( userAgent ) {\n\t// The Edge browser before switching to the Blink engine used to report itself as Chrome (and \"Edge/\")\n\t// but after switching to the Blink it replaced \"Edge/\" with \"Edg/\".\n\treturn userAgent.indexOf( 'chrome/' ) > -1 && userAgent.indexOf( 'edge/' ) < 0;\n}\n\n/**\n * Checks if the current environment supports ES2018 Unicode properties like `\\p{P}` or `\\p{L}`.\n * More information about unicode properties might be found\n * [in Unicode Standard Annex #44](https://www.unicode.org/reports/tr44/#GC_Values_Table).\n *\n * @returns {Boolean}\n */\nexport function isRegExpUnicodePropertySupported() {\n\tlet isSupported = false;\n\n\t// Feature detection for Unicode properties. Added in ES2018. Currently Firefox does not support it.\n\t// See https://github.com/ckeditor/ckeditor5-mention/issues/44#issuecomment-487002174.\n\n\ttry {\n\t\t// Usage of regular expression literal cause error during build (ckeditor/ckeditor5-dev#534).\n\t\tisSupported = 'ć'.search( new RegExp( '[\\\\p{L}]', 'u' ) ) === 0;\n\t} catch ( error ) {\n\t\t// Firefox throws a SyntaxError when the group is unsupported.\n\t}\n\n\treturn isSupported;\n}\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * Set of utils related to keyboard support.\n *\n * @module utils/keyboard\n */\n\nimport CKEditorError from './ckeditorerror';\nimport env from './env';\n\nconst macGlyphsToModifiers = {\n\t'⌘': 'ctrl',\n\t'⇧': 'shift',\n\t'⌥': 'alt'\n};\n\nconst modifiersToMacGlyphs = {\n\t'ctrl': '⌘',\n\t'shift': '⇧',\n\t'alt': '⌥'\n};\n\n/**\n * Object with `keyName => keyCode` pairs for a set of known keys.\n *\n * Contains:\n *\n * * `a-z`,\n * * `0-9`,\n * * `f1-f12`,\n * * `arrow(left|up|right|bottom)`,\n * * `backspace`, `delete`, `enter`, `esc`, `tab`,\n * * `ctrl`, `cmd`, `shift`, `alt`.\n */\nexport const keyCodes = generateKnownKeyCodes();\n\n/**\n * Converts a key name or a {@link module:utils/keyboard~KeystrokeInfo keystroke info} into a key code.\n *\n * Note: Key names are matched with {@link module:utils/keyboard~keyCodes} in a case-insensitive way.\n *\n * @param {String|module:utils/keyboard~KeystrokeInfo} Key name (see {@link module:utils/keyboard~keyCodes})\n * or a keystroke data object.\n * @returns {Number} Key or keystroke code.\n */\nexport function getCode( key ) {\n\tlet keyCode;\n\n\tif ( typeof key == 'string' ) {\n\t\tkeyCode = keyCodes[ key.toLowerCase() ];\n\n\t\tif ( !keyCode ) {\n\t\t\t/**\n\t\t\t * Unknown key name. Only key names contained by the {@link module:utils/keyboard~keyCodes} can be used.\n\t\t\t *\n\t\t\t * @error keyboard-unknown-key\n\t\t\t * @param {String} key\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'keyboard-unknown-key', null, { key } );\n\t\t}\n\t} else {\n\t\tkeyCode = key.keyCode +\n\t\t\t( key.altKey ? keyCodes.alt : 0 ) +\n\t\t\t( key.ctrlKey ? keyCodes.ctrl : 0 ) +\n\t\t\t( key.shiftKey ? keyCodes.shift : 0 );\n\t}\n\n\treturn keyCode;\n}\n\n/**\n * Parses keystroke and returns a keystroke code that will match the code returned by\n * link {@link module:utils/keyboard~getCode} for a corresponding {@link module:utils/keyboard~KeystrokeInfo keystroke info}.\n *\n * The keystroke can be passed in two formats:\n *\n * * as a single string – e.g. `ctrl + A`,\n * * as an array of {@link module:utils/keyboard~keyCodes known key names} and key codes – e.g.:\n *   * `[ 'ctrl', 32 ]` (ctrl + space),\n *   * `[ 'ctrl', 'a' ]` (ctrl + A).\n *\n * Note: Key names are matched with {@link module:utils/keyboard~keyCodes} in a case-insensitive way.\n *\n * Note: Only keystrokes with a single non-modifier key are supported (e.g. `ctrl+A` is OK, but `ctrl+A+B` is not).\n *\n * @param {String|Array.<Number|String>} keystroke Keystroke definition.\n * @returns {Number} Keystroke code.\n */\nexport function parseKeystroke( keystroke ) {\n\tif ( typeof keystroke == 'string' ) {\n\t\tkeystroke = splitKeystrokeText( keystroke );\n\t}\n\n\treturn keystroke\n\t\t.map( key => ( typeof key == 'string' ) ? getCode( key ) : key )\n\t\t.reduce( ( key, sum ) => sum + key, 0 );\n}\n\n/**\n * It translates any keystroke string text like `\"CTRL+A\"` to an\n * environment–specific keystroke, i.e. `\"⌘A\"` on Mac OSX.\n *\n * @param {String} keystroke Keystroke text.\n * @returns {String} Keystroke text specific for the environment.\n */\nexport function getEnvKeystrokeText( keystroke ) {\n\tif ( !env.isMac ) {\n\t\treturn keystroke;\n\t}\n\n\treturn splitKeystrokeText( keystroke )\n\t\t// Replace modifiers (e.g. \"ctrl\") with Mac glyphs (e.g. \"⌘\") first.\n\t\t.map( key => modifiersToMacGlyphs[ key.toLowerCase() ] || key )\n\n\t\t// Decide whether to put \"+\" between keys in the keystroke or not.\n\t\t.reduce( ( value, key ) => {\n\t\t\tif ( value.slice( -1 ) in macGlyphsToModifiers ) {\n\t\t\t\treturn value + key;\n\t\t\t} else {\n\t\t\t\treturn value + '+' + key;\n\t\t\t}\n\t\t} );\n}\n\n/**\n * Returns `true` if the provided key code represents one of the arrow keys.\n *\n * @param {Number} keyCode A key code as in {@link module:utils/keyboard~KeystrokeInfo#keyCode}.\n * @returns {Boolean}\n */\nexport function isArrowKeyCode( keyCode ) {\n\treturn keyCode == keyCodes.arrowright ||\n\t\tkeyCode == keyCodes.arrowleft ||\n\t\tkeyCode == keyCodes.arrowup ||\n\t\tkeyCode == keyCodes.arrowdown;\n}\n\n/**\n * Returns the direction in which the {@link module:engine/model/documentselection~DocumentSelection selection}\n * will move when a provided arrow key code is pressed considering the language direction of the editor content.\n *\n * For instance, in right–to–left (RTL) content languages, pressing the left arrow means moving selection right (forward)\n * in the model structure. Similarly, pressing the right arrow moves the selection left (backward).\n *\n * @param {Number} keyCode A key code as in {@link module:utils/keyboard~KeystrokeInfo#keyCode}.\n * @param {'ltr'|'rtl'} contentLanguageDirection The content language direction, corresponding to\n * {@link module:utils/locale~Locale#contentLanguageDirection}.\n * @returns {'left'|'up'|'right'|'down'} Localized arrow direction.\n */\nexport function getLocalizedArrowKeyCodeDirection( keyCode, contentLanguageDirection ) {\n\tconst isLtrContent = contentLanguageDirection === 'ltr';\n\n\tswitch ( keyCode ) {\n\t\tcase keyCodes.arrowleft:\n\t\t\treturn isLtrContent ? 'left' : 'right';\n\n\t\tcase keyCodes.arrowright:\n\t\t\treturn isLtrContent ? 'right' : 'left';\n\n\t\tcase keyCodes.arrowup:\n\t\t\treturn 'up';\n\n\t\tcase keyCodes.arrowdown:\n\t\t\treturn 'down';\n\t}\n}\n\n/**\n * Determines if the provided key code moves the {@link module:engine/model/documentselection~DocumentSelection selection}\n * forward or backward considering the language direction of the editor content.\n *\n * For instance, in right–to–left (RTL) languages, pressing the left arrow means moving forward\n * in the model structure. Similarly, pressing the right arrow moves the selection backward.\n *\n * @param {Number} keyCode A key code as in {@link module:utils/keyboard~KeystrokeInfo#keyCode}.\n * @param {'ltr'|'rtl'} contentLanguageDirection The content language direction, corresponding to\n * {@link module:utils/locale~Locale#contentLanguageDirection}.\n * @returns {Boolean}\n */\nexport function isForwardArrowKeyCode( keyCode, contentLanguageDirection ) {\n\tconst localizedKeyCodeDirection = getLocalizedArrowKeyCodeDirection( keyCode, contentLanguageDirection );\n\n\treturn localizedKeyCodeDirection === 'down' || localizedKeyCodeDirection === 'right';\n}\n\nfunction generateKnownKeyCodes() {\n\tconst keyCodes = {\n\t\tarrowleft: 37,\n\t\tarrowup: 38,\n\t\tarrowright: 39,\n\t\tarrowdown: 40,\n\t\tbackspace: 8,\n\t\tdelete: 46,\n\t\tenter: 13,\n\t\tspace: 32,\n\t\tesc: 27,\n\t\ttab: 9,\n\n\t\t// The idea about these numbers is that they do not collide with any real key codes, so we can use them\n\t\t// like bit masks.\n\t\tctrl: 0x110000,\n\t\t// Has the same code as ctrl, because their behaviour should be unified across the editor.\n\t\t// See http://ckeditor.github.io/editor-recommendations/general-policies#ctrl-vs-cmd\n\t\tcmd: 0x110000,\n\t\tshift: 0x220000,\n\t\talt: 0x440000\n\t};\n\n\t// a-z\n\tfor ( let code = 65; code <= 90; code++ ) {\n\t\tconst letter = String.fromCharCode( code );\n\n\t\tkeyCodes[ letter.toLowerCase() ] = code;\n\t}\n\n\t// 0-9\n\tfor ( let code = 48; code <= 57; code++ ) {\n\t\tkeyCodes[ code - 48 ] = code;\n\t}\n\n\t// F1-F12\n\tfor ( let code = 112; code <= 123; code++ ) {\n\t\tkeyCodes[ 'f' + ( code - 111 ) ] = code;\n\t}\n\n\treturn keyCodes;\n}\n\nfunction splitKeystrokeText( keystroke ) {\n\treturn keystroke.split( /\\s*\\+\\s*/ );\n}\n\n/**\n * Information about a keystroke.\n *\n * @interface module:utils/keyboard~KeystrokeInfo\n */\n\n/**\n * The [key code](https://developer.mozilla.org/en-US/docs/Web/API/KeyboardEvent/keyCode).\n *\n * @member {Number} module:utils/keyboard~KeystrokeInfo#keyCode\n */\n\n/**\n * Whether the <kbd>Alt</kbd> modifier was pressed.\n *\n * @member {Bolean} module:utils/keyboard~KeystrokeInfo#altKey\n */\n\n/**\n * Whether the <kbd>Ctrl</kbd> or <kbd>Cmd</kbd> modifier was pressed.\n *\n * @member {Bolean} module:utils/keyboard~KeystrokeInfo#ctrlKey\n */\n\n/**\n * Whether the <kbd>Shift</kbd> modifier was pressed.\n *\n * @member {Bolean} module:utils/keyboard~KeystrokeInfo#shiftKey\n */\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module engine/view/uielement\n */\n\nimport Element from './element';\nimport CKEditorError from '@ckeditor/ckeditor5-utils/src/ckeditorerror';\nimport Node from './node';\nimport { keyCodes } from '@ckeditor/ckeditor5-utils/src/keyboard';\n\n/**\n * UI element class. It should be used to represent editing UI which needs to be injected into the editing view\n * If possible, you should keep your UI outside the editing view. However, if that is not possible,\n * UI elements can be used.\n *\n * How a UI element is rendered is in your control (you pass a callback to\n * {@link module:engine/view/downcastwriter~DowncastWriter#createUIElement `downcastWriter#createUIElement()`}).\n * The editor will ignore your UI element – the selection cannot be placed in it, it is skipped (invisible) when\n * the user modifies the selection by using arrow keys and the editor does not listen to any mutations which\n * happen inside your UI elements.\n *\n * The limitation is that you cannot convert a model element to a UI element. UI elements need to be\n * created for {@link module:engine/model/markercollection~Marker markers} or as additinal elements\n * inside normal {@link module:engine/view/containerelement~ContainerElement container elements}.\n *\n * To create a new UI element use the\n * {@link module:engine/view/downcastwriter~DowncastWriter#createUIElement `downcastWriter#createUIElement()`} method.\n *\n * @extends module:engine/view/element~Element\n */\nexport default class UIElement extends Element {\n\t/**\n\t * Creates new instance of UIElement.\n\t *\n\t * Throws {@link module:utils/ckeditorerror~CKEditorError CKEditorError} `view-uielement-cannot-add` when third parameter is passed,\n\t * to inform that usage of UIElement is incorrect (adding child nodes to UIElement is forbidden).\n\t *\n\t * @see module:engine/view/downcastwriter~DowncastWriter#createUIElement\n\t * @protected\n\t * @param {module:engine/view/document~Document} document The document instance to which this element belongs.\n\t * @param {String} name Node name.\n\t * @param {Object|Iterable} [attributes] Collection of attributes.\n\t * @param {module:engine/view/node~Node|Iterable.<module:engine/view/node~Node>} [children]\n\t * A list of nodes to be inserted into created element.\n\t */\n\tconstructor( document, name, attributes, children ) {\n\t\tsuper( document, name, attributes, children );\n\n\t\t/**\n\t\t * Returns `null` because filler is not needed for UIElements.\n\t\t *\n\t\t * @method #getFillerOffset\n\t\t * @returns {null} Always returns null.\n\t\t */\n\t\tthis.getFillerOffset = getFillerOffset;\n\t}\n\n\t/**\n\t * Checks whether this object is of the given.\n\t *\n\t *\t\tuiElement.is( 'uiElement' ); // -> true\n\t *\t\tuiElement.is( 'element' ); // -> true\n\t *\t\tuiElement.is( 'node' ); // -> true\n\t *\t\tuiElement.is( 'view:uiElement' ); // -> true\n\t *\t\tuiElement.is( 'view:element' ); // -> true\n\t *\t\tuiElement.is( 'view:node' ); // -> true\n\t *\n\t *\t\tuiElement.is( 'model:element' ); // -> false\n\t *\t\tuiElement.is( 'documentFragment' ); // -> false\n\t *\n\t * Assuming that the object being checked is an ui element, you can also check its\n\t * {@link module:engine/view/uielement~UIElement#name name}:\n\t *\n\t *\t\tuiElement.is( 'element', 'span' ); // -> true if this is a span ui element\n\t *\t\tuiElement.is( 'uiElement', 'span' ); // -> same as above\n\t *\t\ttext.is( 'element', 'span' ); -> false\n\t *\n\t * {@link module:engine/view/node~Node#is Check the entire list of view objects} which implement the `is()` method.\n\t *\n\t * @param {String} type Type to check.\n\t * @param {String} [name] Element name.\n\t * @returns {Boolean}\n\t */\n\tis( type, name = null ) {\n\t\tif ( !name ) {\n\t\t\treturn type === 'uiElement' || type === 'view:uiElement' ||\n\t\t\t\t// From super.is(). This is highly utilised method and cannot call super. See ckeditor/ckeditor5#6529.\n\t\t\t\ttype === 'element' || type === 'view:element' ||\n\t\t\t\ttype === 'node' || type === 'view:node';\n\t\t} else {\n\t\t\treturn name === this.name && (\n\t\t\t\ttype === 'uiElement' || type === 'view:uiElement' ||\n\t\t\t\ttype === 'element' || type === 'view:element'\n\t\t\t);\n\t\t}\n\t}\n\n\t/**\n\t * Overrides {@link module:engine/view/element~Element#_insertChild} method.\n\t * Throws {@link module:utils/ckeditorerror~CKEditorError CKEditorError} `view-uielement-cannot-add` to prevent adding any child nodes\n\t * to UIElement.\n\t *\n\t * @protected\n\t */\n\t_insertChild( index, nodes ) {\n\t\tif ( nodes && ( nodes instanceof Node || Array.from( nodes ).length > 0 ) ) {\n\t\t\t/**\n\t\t\t * Cannot add children to {@link module:engine/view/uielement~UIElement}.\n\t\t\t *\n\t\t\t * @error view-uielement-cannot-add\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'view-uielement-cannot-add', this );\n\t\t}\n\t}\n\n\t/**\n\t * Renders this {@link module:engine/view/uielement~UIElement} to DOM. This method is called by\n\t * {@link module:engine/view/domconverter~DomConverter}.\n\t * Do not use inheritance to create custom rendering method, replace `render()` method instead:\n\t *\n\t *\t\tconst myUIElement = downcastWriter.createUIElement( 'span' );\n\t *\t\tmyUIElement.render = function( domDocument ) {\n\t *\t\t\tconst domElement = this.toDomElement( domDocument );\n\t *\t\t\tdomElement.innerHTML = '<b>this is ui element</b>';\n\t *\n\t *\t\t\treturn domElement;\n\t *\t\t};\n\t *\n\t * If changes in your UI element should trigger some editor UI update you should call\n\t * the {@link module:core/editor/editorui~EditorUI#update `editor.ui.update()`} method\n\t * after rendering your UI element.\n\t *\n\t * @param {Document} domDocument\n\t * @returns {HTMLElement}\n\t */\n\trender( domDocument ) {\n\t\treturn this.toDomElement( domDocument );\n\t}\n\n\t/**\n\t * Creates DOM element based on this view UIElement.\n\t * Note that each time this method is called new DOM element is created.\n\t *\n\t * @param {Document} domDocument\n\t * @returns {HTMLElement}\n\t */\n\ttoDomElement( domDocument ) {\n\t\tconst domElement = domDocument.createElement( this.name );\n\n\t\tfor ( const key of this.getAttributeKeys() ) {\n\t\t\tdomElement.setAttribute( key, this.getAttribute( key ) );\n\t\t}\n\n\t\treturn domElement;\n\t}\n}\n\n/**\n * This function injects UI element handling to the given {@link module:engine/view/document~Document document}.\n *\n * A callback is added to {@link module:engine/view/document~Document#event:keydown document keydown event}.\n * The callback handles the situation when right arrow key is pressed and selection is collapsed before a UI element.\n * Without this handler, it would be impossible to \"jump over\" UI element using right arrow key.\n *\n * @param {module:engine/view/view~View} view View controller to which the quirks handling will be injected.\n */\nexport function injectUiElementHandling( view ) {\n\tview.document.on( 'keydown', ( evt, data ) => jumpOverUiElement( evt, data, view.domConverter ) );\n}\n\n// Returns `null` because block filler is not needed for UIElements.\n//\n// @returns {null}\nfunction getFillerOffset() {\n\treturn null;\n}\n\n// Selection cannot be placed in a `UIElement`. Whenever it is placed there, it is moved before it. This\n// causes a situation when it is impossible to jump over `UIElement` using right arrow key, because the selection\n// ends up in ui element (in DOM) and is moved back to the left. This handler fixes this situation.\nfunction jumpOverUiElement( evt, data, domConverter ) {\n\tif ( data.keyCode == keyCodes.arrowright ) {\n\t\tconst domSelection = data.domTarget.ownerDocument.defaultView.getSelection();\n\t\tconst domSelectionCollapsed = domSelection.rangeCount == 1 && domSelection.getRangeAt( 0 ).collapsed;\n\n\t\t// Jump over UI element if selection is collapsed or shift key is pressed. These are the cases when selection would extend.\n\t\tif ( domSelectionCollapsed || data.shiftKey ) {\n\t\t\tconst domParent = domSelection.focusNode;\n\t\t\tconst domOffset = domSelection.focusOffset;\n\n\t\t\tconst viewPosition = domConverter.domPositionToView( domParent, domOffset );\n\n\t\t\t// In case if dom element is not converted to view or is not mapped or something. Happens for example in some tests.\n\t\t\tif ( viewPosition === null ) {\n\t\t\t\treturn;\n\t\t\t}\n\n\t\t\t// Skip all following ui elements.\n\t\t\tlet jumpedOverAnyUiElement = false;\n\n\t\t\tconst nextViewPosition = viewPosition.getLastMatchingPosition( value => {\n\t\t\t\tif ( value.item.is( 'uiElement' ) ) {\n\t\t\t\t\t// Remember that there was at least one ui element.\n\t\t\t\t\tjumpedOverAnyUiElement = true;\n\t\t\t\t}\n\n\t\t\t\t// Jump over ui elements, jump over empty attribute elements, move up from inside of attribute element.\n\t\t\t\tif ( value.item.is( 'uiElement' ) || value.item.is( 'attributeElement' ) ) {\n\t\t\t\t\treturn true;\n\t\t\t\t}\n\n\t\t\t\t// Don't jump over text or don't get out of container element.\n\t\t\t\treturn false;\n\t\t\t} );\n\n\t\t\t// If anything has been skipped, fix position.\n\t\t\t// This `if` could be possibly omitted but maybe it is better not to mess with DOM selection if not needed.\n\t\t\tif ( jumpedOverAnyUiElement ) {\n\t\t\t\tconst newDomPosition = domConverter.viewPositionToDom( nextViewPosition );\n\n\t\t\t\tif ( domSelectionCollapsed ) {\n\t\t\t\t\t// Selection was collapsed, so collapse it at further position.\n\t\t\t\t\tdomSelection.collapse( newDomPosition.parent, newDomPosition.offset );\n\t\t\t\t} else {\n\t\t\t\t\t// Selection was not collapse, so extend it instead of collapsing.\n\t\t\t\t\tdomSelection.extend( newDomPosition.parent, newDomPosition.offset );\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module engine/view/rawelement\n */\n\nimport Element from './element';\nimport CKEditorError from '@ckeditor/ckeditor5-utils/src/ckeditorerror';\nimport Node from './node';\n\n/**\n * The raw element class.\n *\n * The raw elements work as data containers (\"wrappers\", \"sandboxes\") but their children are not managed or\n * even recognized by the editor. This encapsulation allows integrations to maintain custom DOM structures\n * in the editor content without, for instance, worrying about compatibility with other editor features.\n * Raw elements are a perfect tool for integration with external frameworks and data sources.\n *\n * Unlike {@link module:engine/view/uielement~UIElement UI elements}, raw elements act like real editor\n * content (similar to {@link module:engine/view/containerelement~ContainerElement} or\n * {@link module:engine/view/emptyelement~EmptyElement}), they are considered by the editor selection and\n * {@link module:widget/utils~toWidget they can work as widgets}.\n *\n * To create a new raw element, use the\n * {@link module:engine/view/downcastwriter~DowncastWriter#createRawElement `downcastWriter#createRawElement()`} method.\n *\n * @extends module:engine/view/element~Element\n */\nexport default class RawElement extends Element {\n\t/**\n\t * Creates a new instance of a raw element.\n\t *\n\t * Throws the `view-rawelement-cannot-add` {@link module:utils/ckeditorerror~CKEditorError CKEditorError} when the `children`\n\t * parameter is passed to inform that the usage of `RawElement` is incorrect (adding child nodes to `RawElement` is forbidden).\n\t *\n\t * @see module:engine/view/downcastwriter~DowncastWriter#createRawElement\n\t * @protected\n\t * @param {module:engine/view/document~Document} document The document instance to which this element belongs.\n\t * @param {String} name A node name.\n\t * @param {Object|Iterable} [attrs] The collection of attributes.\n\t * @param {module:engine/view/node~Node|Iterable.<module:engine/view/node~Node>} [children]\n\t * A list of nodes to be inserted into the created element.\n\t */\n\tconstructor( document, name, attrs, children ) {\n\t\tsuper( document, name, attrs, children );\n\n\t\t/**\n\t\t * Returns `null` because filler is not needed for raw elements.\n\t\t *\n\t\t * @method #getFillerOffset\n\t\t * @returns {null} Always returns null.\n\t\t */\n\t\tthis.getFillerOffset = getFillerOffset;\n\t}\n\n\t/**\n\t * Checks whether this object is of the given type or name.\n\t *\n\t *\t\trawElement.is( 'rawElement' ); // -> true\n\t *\t\trawElement.is( 'element' ); // -> true\n\t *\t\trawElement.is( 'node' ); // -> true\n\t *\t\trawElement.is( 'view:rawElement' ); // -> true\n\t *\t\trawElement.is( 'view:element' ); // -> true\n\t *\t\trawElement.is( 'view:node' ); // -> true\n\t *\n\t *\t\trawElement.is( 'model:element' ); // -> false\n\t *\t\trawElement.is( 'documentFragment' ); // -> false\n\t *\n\t * Assuming that the object being checked is a raw element, you can also check its\n\t * {@link module:engine/view/rawelement~RawElement#name name}:\n\t *\n\t *\t\trawElement.is( 'img' ); // -> true if this is an img element\n\t *\t\trawElement.is( 'rawElement', 'img' ); // -> same as above\n\t *\t\ttext.is( 'img' ); -> false\n\t *\n\t * {@link module:engine/view/node~Node#is Check the entire list of view objects} which implement the `is()` method.\n\t *\n\t * @param {String} type The type to check when the `name` parameter is present.\n\t * Otherwise, it acts like the `name` parameter.\n\t * @param {String} [name] The element name.\n\t * @returns {Boolean}\n\t */\n\tis( type, name = null ) {\n\t\tif ( !name ) {\n\t\t\treturn type === 'rawElement' || type === 'view:rawElement' ||\n\t\t\t\t// From super.is(). This is highly utilised method and cannot call super. See ckeditor/ckeditor5#6529.\n\t\t\t\ttype === this.name || type === 'view:' + this.name ||\n\t\t\t\ttype === 'element' || type === 'view:element' ||\n\t\t\t\ttype === 'node' || type === 'view:node';\n\t\t} else {\n\t\t\treturn name === this.name && (\n\t\t\t\ttype === 'rawElement' || type === 'view:rawElement' ||\n\t\t\t\ttype === 'element' || type === 'view:element'\n\t\t\t);\n\t\t}\n\t}\n\n\t/**\n\t * Overrides the {@link module:engine/view/element~Element#_insertChild} method.\n\t * Throws the `view-rawelement-cannot-add` {@link module:utils/ckeditorerror~CKEditorError CKEditorError} to prevent\n\t * adding any child nodes to a raw element.\n\t *\n\t * @protected\n\t */\n\t_insertChild( index, nodes ) {\n\t\tif ( nodes && ( nodes instanceof Node || Array.from( nodes ).length > 0 ) ) {\n\t\t\t/**\n\t\t\t * Cannot add children to a {@link module:engine/view/rawelement~RawElement} instance.\n\t\t\t *\n\t\t\t * @error view-rawelement-cannot-add\n\t\t\t */\n\t\t\tthrow new CKEditorError(\n\t\t\t\t'view-rawelement-cannot-add',\n\t\t\t\t[ this, nodes ]\n\t\t\t);\n\t\t}\n\t}\n\n\t/**\n\t * This allows rendering the children of a {@link module:engine/view/rawelement~RawElement} on the DOM level.\n\t * This method is called by the {@link module:engine/view/domconverter~DomConverter} with the raw DOM element\n\t * passed as an argument, leaving the number and shape of the children up to the integrator.\n\t *\n\t * This method **must be defined** for the raw element to work:\n\t *\n\t *\t\tconst myRawElement = downcastWriter.createRawElement( 'div' );\n\t *\n\t *\t\tmyRawElement.render = function( domElement ) {\n\t *\t\t\tdomElement.innerHTML = '<b>This is the raw content of myRawElement.</b>';\n\t *\t\t};\n\t *\n\t * @method #render\n\t * @param {HTMLElement} domElement The native DOM element representing the raw view element.\n\t */\n}\n\n// Returns `null` because block filler is not needed for raw elements.\n//\n// @returns {null}\nfunction getFillerOffset() {\n\treturn null;\n}\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module engine/view/documentfragment\n */\n\nimport Text from './text';\nimport TextProxy from './textproxy';\nimport mix from '@ckeditor/ckeditor5-utils/src/mix';\nimport isIterable from '@ckeditor/ckeditor5-utils/src/isiterable';\nimport EmitterMixin from '@ckeditor/ckeditor5-utils/src/emittermixin';\n\n/**\n * Document fragment.\n *\n * To create a new document fragment instance use the\n * {@link module:engine/view/upcastwriter~UpcastWriter#createDocumentFragment `UpcastWriter#createDocumentFragment()`}\n * method.\n */\nexport default class DocumentFragment {\n\t/**\n\t * Creates new DocumentFragment instance.\n\t *\n\t * @protected\n\t * @param {module:engine/view/document~Document} document The document to which this document fragment belongs.\n\t * @param {module:engine/view/node~Node|Iterable.<module:engine/view/node~Node>} [children]\n\t * A list of nodes to be inserted into the created document fragment.\n\t */\n\tconstructor( document, children ) {\n\t\t/**\n\t\t * The document to which this document fragment belongs.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:engine/view/document~Document}\n\t\t */\n\t\tthis.document = document;\n\n\t\t/**\n\t\t * Array of child nodes.\n\t\t *\n\t\t * @protected\n\t\t * @member {Array.<module:engine/view/element~Element>} module:engine/view/documentfragment~DocumentFragment#_children\n\t\t */\n\t\tthis._children = [];\n\n\t\tif ( children ) {\n\t\t\tthis._insertChild( 0, children );\n\t\t}\n\t}\n\n\t/**\n\t * Iterable interface.\n\t *\n\t * Iterates over nodes added to this document fragment.\n\t *\n\t * @returns {Iterable.<module:engine/view/node~Node>}\n\t */\n\t[ Symbol.iterator ]() {\n\t\treturn this._children[ Symbol.iterator ]();\n\t}\n\n\t/**\n\t * Number of child nodes in this document fragment.\n\t *\n\t * @readonly\n\t * @type {Number}\n\t */\n\tget childCount() {\n\t\treturn this._children.length;\n\t}\n\n\t/**\n\t * Is `true` if there are no nodes inside this document fragment, `false` otherwise.\n\t *\n\t * @readonly\n\t * @type {Boolean}\n\t */\n\tget isEmpty() {\n\t\treturn this.childCount === 0;\n\t}\n\n\t/**\n\t * Artificial root of `DocumentFragment`. Returns itself. Added for compatibility reasons.\n\t *\n\t * @readonly\n\t * @type {module:engine/model/documentfragment~DocumentFragment}\n\t */\n\tget root() {\n\t\treturn this;\n\t}\n\n\t/**\n\t * Artificial parent of `DocumentFragment`. Returns `null`. Added for compatibility reasons.\n\t *\n\t * @readonly\n\t * @type {null}\n\t */\n\tget parent() {\n\t\treturn null;\n\t}\n\n\t/**\n\t * Checks whether this object is of the given type.\n\t *\n\t *\t\tdocFrag.is( 'documentFragment' ); // -> true\n\t *\t\tdocFrag.is( 'view:documentFragment' ); // -> true\n\t *\n\t *\t\tdocFrag.is( 'model:documentFragment' ); // -> false\n\t *\t\tdocFrag.is( 'element' ); // -> false\n\t *\t\tdocFrag.is( 'node' ); // -> false\n\t *\n\t * {@link module:engine/view/node~Node#is Check the entire list of view objects} which implement the `is()` method.\n\t *\n\t * @param {String} type\n\t * @returns {Boolean}\n\t */\n\tis( type ) {\n\t\treturn type === 'documentFragment' || type === 'view:documentFragment';\n\t}\n\n\t/**\n\t * {@link module:engine/view/documentfragment~DocumentFragment#_insertChild Insert} a child node or a list of child nodes at the end\n\t * and sets the parent of these nodes to this fragment.\n\t *\n\t * @param {module:engine/view/item~Item|Iterable.<module:engine/view/item~Item>} items Items to be inserted.\n\t * @returns {Number} Number of appended nodes.\n\t */\n\t_appendChild( items ) {\n\t\treturn this._insertChild( this.childCount, items );\n\t}\n\n\t/**\n\t * Gets child at the given index.\n\t *\n\t * @param {Number} index Index of child.\n\t * @returns {module:engine/view/node~Node} Child node.\n\t */\n\tgetChild( index ) {\n\t\treturn this._children[ index ];\n\t}\n\n\t/**\n\t * Gets index of the given child node. Returns `-1` if child node is not found.\n\t *\n\t * @param {module:engine/view/node~Node} node Child node.\n\t * @returns {Number} Index of the child node.\n\t */\n\tgetChildIndex( node ) {\n\t\treturn this._children.indexOf( node );\n\t}\n\n\t/**\n\t * Gets child nodes iterator.\n\t *\n\t * @returns {Iterable.<module:engine/view/node~Node>} Child nodes iterator.\n\t */\n\tgetChildren() {\n\t\treturn this._children[ Symbol.iterator ]();\n\t}\n\n\t/**\n\t * Inserts a child node or a list of child nodes on the given index and sets the parent of these nodes to\n\t * this fragment.\n\t *\n\t * @param {Number} index Position where nodes should be inserted.\n\t * @param {module:engine/view/item~Item|Iterable.<module:engine/view/item~Item>} items Items to be inserted.\n\t * @returns {Number} Number of inserted nodes.\n\t */\n\t_insertChild( index, items ) {\n\t\tthis._fireChange( 'children', this );\n\t\tlet count = 0;\n\n\t\tconst nodes = normalize( this.document, items );\n\n\t\tfor ( const node of nodes ) {\n\t\t\t// If node that is being added to this element is already inside another element, first remove it from the old parent.\n\t\t\tif ( node.parent !== null ) {\n\t\t\t\tnode._remove();\n\t\t\t}\n\n\t\t\tnode.parent = this;\n\n\t\t\tthis._children.splice( index, 0, node );\n\t\t\tindex++;\n\t\t\tcount++;\n\t\t}\n\n\t\treturn count;\n\t}\n\n\t/**\n\t * Removes number of child nodes starting at the given index and set the parent of these nodes to `null`.\n\t *\n\t * @param {Number} index Number of the first node to remove.\n\t * @param {Number} [howMany=1] Number of nodes to remove.\n\t * @returns {Array.<module:engine/view/node~Node>} The array of removed nodes.\n\t */\n\t_removeChildren( index, howMany = 1 ) {\n\t\tthis._fireChange( 'children', this );\n\n\t\tfor ( let i = index; i < index + howMany; i++ ) {\n\t\t\tthis._children[ i ].parent = null;\n\t\t}\n\n\t\treturn this._children.splice( index, howMany );\n\t}\n\n\t/**\n\t * Fires `change` event with given type of the change.\n\t *\n\t * @private\n\t * @param {module:engine/view/document~ChangeType} type Type of the change.\n\t * @param {module:engine/view/node~Node} node Changed node.\n\t * @fires module:engine/view/node~Node#change\n\t */\n\t_fireChange( type, node ) {\n\t\tthis.fire( 'change:' + type, node );\n\t}\n\n\t// @if CK_DEBUG_ENGINE // printTree() {\n\t// @if CK_DEBUG_ENGINE //\tlet string = 'ViewDocumentFragment: [';\n\n\t// @if CK_DEBUG_ENGINE //\tfor ( const child of this.getChildren() ) {\n\t// @if CK_DEBUG_ENGINE //\t\tif ( child.is( '$text' ) ) {\n\t// @if CK_DEBUG_ENGINE //\t\t\tstring += '\\n' + '\\t'.repeat( 1 ) + child.data;\n\t// @if CK_DEBUG_ENGINE //\t\t} else {\n\t// @if CK_DEBUG_ENGINE //\t\t\tstring += '\\n' + child.printTree( 1 );\n\t// @if CK_DEBUG_ENGINE //\t\t}\n\t// @if CK_DEBUG_ENGINE //\t}\n\n\t// @if CK_DEBUG_ENGINE //\tstring += '\\n]';\n\n\t// @if CK_DEBUG_ENGINE //\treturn string;\n\t// @if CK_DEBUG_ENGINE // }\n\n\t// @if CK_DEBUG_ENGINE // logTree() {\n\t// @if CK_DEBUG_ENGINE // \tconsole.log( this.printTree() );\n\t// @if CK_DEBUG_ENGINE // }\n}\n\nmix( DocumentFragment, EmitterMixin );\n\n// Converts strings to Text and non-iterables to arrays.\n//\n// @param {String|module:engine/view/item~Item|Iterable.<String|module:engine/view/item~Item>}\n// @returns {Iterable.<module:engine/view/node~Node>}\nfunction normalize( document, nodes ) {\n\t// Separate condition because string is iterable.\n\tif ( typeof nodes == 'string' ) {\n\t\treturn [ new Text( document, nodes ) ];\n\t}\n\n\tif ( !isIterable( nodes ) ) {\n\t\tnodes = [ nodes ];\n\t}\n\n\t// Array.from to enable .map() on non-arrays.\n\treturn Array.from( nodes )\n\t\t.map( node => {\n\t\t\tif ( typeof node == 'string' ) {\n\t\t\t\treturn new Text( document, node );\n\t\t\t}\n\n\t\t\tif ( node instanceof TextProxy ) {\n\t\t\t\treturn new Text( document, node.data );\n\t\t\t}\n\n\t\t\treturn node;\n\t\t} );\n}\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module module:engine/view/downcastwriter\n */\n\nimport Position from './position';\nimport Range from './range';\nimport Selection from './selection';\nimport ContainerElement from './containerelement';\nimport AttributeElement from './attributeelement';\nimport EmptyElement from './emptyelement';\nimport UIElement from './uielement';\nimport RawElement from './rawelement';\nimport CKEditorError from '@ckeditor/ckeditor5-utils/src/ckeditorerror';\nimport DocumentFragment from './documentfragment';\nimport isIterable from '@ckeditor/ckeditor5-utils/src/isiterable';\nimport Text from './text';\nimport EditableElement from './editableelement';\nimport { isPlainObject } from 'lodash-es';\n\n/**\n * View downcast writer.\n *\n * It provides a set of methods used to manipulate view nodes.\n *\n * Do not create an instance of this writer manually. To modify a view structure, use\n * the {@link module:engine/view/view~View#change `View#change()`} block.\n *\n * The `DowncastWriter` is designed to work with semantic views which are the views that were/are being downcasted from the model.\n * To work with ordinary views (e.g. parsed from a pasted content) use the\n * {@link module:engine/view/upcastwriter~UpcastWriter upcast writer}.\n *\n * Read more about changing the view in the {@glink framework/guides/architecture/editing-engine#changing-the-view Changing the view}\n * section of the {@glink framework/guides/architecture/editing-engine Editing engine architecture} guide.\n */\nexport default class DowncastWriter {\n\t/**\n\t * @param {module:engine/view/document~Document} document The view document instance.\n\t */\n\tconstructor( document ) {\n\t\t/**\n\t\t * The view document instance in which this writer operates.\n\t\t *\n\t\t * @readonly\n\t\t * @type {module:engine/view/document~Document}\n\t\t */\n\t\tthis.document = document;\n\n\t\t/**\n\t\t * Holds references to the attribute groups that share the same {@link module:engine/view/attributeelement~AttributeElement#id id}.\n\t\t * The keys are `id`s, the values are `Set`s holding {@link module:engine/view/attributeelement~AttributeElement}s.\n\t\t *\n\t\t * @private\n\t\t * @type {Map.<String,Set>}\n\t\t */\n\t\tthis._cloneGroups = new Map();\n\t}\n\n\t/**\n\t * Sets {@link module:engine/view/documentselection~DocumentSelection selection's} ranges and direction to the\n\t * specified location based on the given {@link module:engine/view/selection~Selectable selectable}.\n\t *\n\t * Usage:\n\t *\n\t *\t\t// Sets selection to the given range.\n\t *\t\tconst range = writer.createRange( start, end );\n\t *\t\twriter.setSelection( range );\n\t *\n\t *\t\t// Sets backward selection to the given range.\n\t *\t\tconst range = writer.createRange( start, end );\n\t *\t\twriter.setSelection( range );\n\t *\n\t *\t\t// Sets selection to given ranges.\n\t * \t\tconst ranges = [ writer.createRange( start1, end2 ), writer.createRange( start2, end2 ) ];\n\t *\t\twriter.setSelection( range );\n\t *\n\t *\t\t// Sets selection to the other selection.\n\t *\t\tconst otherSelection = writer.createSelection();\n\t *\t\twriter.setSelection( otherSelection );\n\t *\n\t * \t\t// Sets collapsed selection at the given position.\n\t *\t\tconst position = writer.createPositionFromPath( root, path );\n\t *\t\twriter.setSelection( position );\n\t *\n\t * \t\t// Sets collapsed selection at the position of given item and offset.\n\t *\t\tconst paragraph = writer.createContainerElement( 'p' );\n\t *\t\twriter.setSelection( paragraph, offset );\n\t *\n\t * Creates a range inside an {@link module:engine/view/element~Element element} which starts before the first child of\n \t * that element and ends after the last child of that element.\n\t *\n\t * \t\twriter.setSelection( paragraph, 'in' );\n\t *\n\t * Creates a range on the {@link module:engine/view/item~Item item} which starts before the item and ends just after the item.\n\t *\n\t *\t\twriter.setSelection( paragraph, 'on' );\n\t *\n\t * \t\t// Removes all ranges.\n\t *\t\twriter.setSelection( null );\n\t *\n\t * `DowncastWriter#setSelection()` allow passing additional options (`backward`, `fake` and `label`) as the last argument.\n\t *\n\t *\t\t// Sets selection as backward.\n\t *\t\twriter.setSelection( range, { backward: true } );\n\t *\n\t *\t\t// Sets selection as fake.\n\t *\t\t// Fake selection does not render as browser native selection over selected elements and is hidden to the user.\n\t * \t\t// This way, no native selection UI artifacts are displayed to the user and selection over elements can be\n\t * \t\t// represented in other way, for example by applying proper CSS class.\n\t *\t\twriter.setSelection( range, { fake: true } );\n\t *\n\t * \t\t// Additionally fake's selection label can be provided. It will be used to describe fake selection in DOM\n\t * \t\t// (and be  properly handled by screen readers).\n\t *\t\twriter.setSelection( range, { fake: true, label: 'foo' } );\n\t *\n\t * @param {module:engine/view/selection~Selectable} selectable\n\t * @param {Number|'before'|'end'|'after'|'on'|'in'} [placeOrOffset] Sets place or offset of the selection.\n\t * @param {Object} [options]\n\t * @param {Boolean} [options.backward] Sets this selection instance to be backward.\n\t * @param {Boolean} [options.fake] Sets this selection instance to be marked as `fake`.\n\t * @param {String} [options.label] Label for the fake selection.\n\t */\n\tsetSelection( selectable, placeOrOffset, options ) {\n\t\tthis.document.selection._setTo( selectable, placeOrOffset, options );\n\t}\n\n\t/**\n\t * Moves {@link module:engine/view/documentselection~DocumentSelection#focus selection's focus} to the specified location.\n\t *\n\t * The location can be specified in the same form as {@link module:engine/view/view~View#createPositionAt view.createPositionAt()}\n\t * parameters.\n\t *\n\t * @param {module:engine/view/item~Item|module:engine/view/position~Position} itemOrPosition\n\t * @param {Number|'end'|'before'|'after'} [offset] Offset or one of the flags. Used only when\n\t * first parameter is a {@link module:engine/view/item~Item view item}.\n\t */\n\tsetSelectionFocus( itemOrPosition, offset ) {\n\t\tthis.document.selection._setFocus( itemOrPosition, offset );\n\t}\n\n\t/**\n\t * Creates a new {@link module:engine/view/text~Text text node}.\n\t *\n\t *\t\twriter.createText( 'foo' );\n\t *\n\t * @param {String} data The text's data.\n\t * @returns {module:engine/view/text~Text} The created text node.\n\t */\n\tcreateText( data ) {\n\t\treturn new Text( this.document, data );\n\t}\n\n\t/**\n\t * Creates a new {@link module:engine/view/attributeelement~AttributeElement}.\n\t *\n\t *\t\twriter.createAttributeElement( 'strong' );\n\t *\t\twriter.createAttributeElement( 'a', { href: 'foo.bar' } );\n\t *\n\t *\t\t// Make `<a>` element contain other attributes element so the `<a>` element is not broken.\n\t *\t\twriter.createAttributeElement( 'a', { href: 'foo.bar' }, { priority: 5 } );\n\t *\n\t *\t\t// Set `id` of a marker element so it is not joined or merged with \"normal\" elements.\n\t *\t\twriter.createAttributeElement( 'span', { class: 'my-marker' }, { id: 'marker:my' } );\n\t *\n\t * @param {String} name Name of the element.\n\t * @param {Object} [attributes] Element's attributes.\n\t * @param {Object} [options] Element's options.\n\t * @param {Number} [options.priority] Element's {@link module:engine/view/attributeelement~AttributeElement#priority priority}.\n\t * @param {Number|String} [options.id] Element's {@link module:engine/view/attributeelement~AttributeElement#id id}.\n\t * @returns {module:engine/view/attributeelement~AttributeElement} Created element.\n\t */\n\tcreateAttributeElement( name, attributes, options = {} ) {\n\t\tconst attributeElement = new AttributeElement( this.document, name, attributes );\n\n\t\tif ( options.priority ) {\n\t\t\tattributeElement._priority = options.priority;\n\t\t}\n\n\t\tif ( options.id ) {\n\t\t\tattributeElement._id = options.id;\n\t\t}\n\n\t\treturn attributeElement;\n\t}\n\n\t/**\n\t * Creates a new {@link module:engine/view/containerelement~ContainerElement}.\n\t *\n\t *\t\twriter.createContainerElement( 'p' );\n\t *\n\t *\t\t// Create element with custom attributes.\n\t *\t\twriter.createContainerElement( 'div', { id: 'foo-bar', 'data-baz': '123' } );\n\t *\n\t *\t\t// Create element with custom styles.\n\t *\t\twriter.createContainerElement( 'p', { style: 'font-weight: bold; padding-bottom: 10px' } );\n\t *\n\t *\t\t// Create element with custom classes.\n\t *\t\twriter.createContainerElement( 'p', { class: 'foo bar baz' } );\n\t *\n\t * @param {String} name Name of the element.\n\t * @param {Object} [attributes] Elements attributes.\n\t * @returns {module:engine/view/containerelement~ContainerElement} Created element.\n\t */\n\tcreateContainerElement( name, attributes ) {\n\t\treturn new ContainerElement( this.document, name, attributes );\n\t}\n\n\t/**\n\t * Creates a new {@link module:engine/view/editableelement~EditableElement}.\n\t *\n\t *\t\twriter.createEditableElement( 'div' );\n\t *\t\twriter.createEditableElement( 'div', { id: 'foo-1234' } );\n\t *\n\t * Note: The editable element is to be used in the editing pipeline. Usually, together with\n\t * {@link module:widget/utils~toWidgetEditable `toWidgetEditable()`}.\n\t *\n\t * @param {String} name Name of the element.\n\t * @param {Object} [attributes] Elements attributes.\n\t * @returns {module:engine/view/editableelement~EditableElement} Created element.\n\t */\n\tcreateEditableElement( name, attributes ) {\n\t\tconst editableElement = new EditableElement( this.document, name, attributes );\n\t\teditableElement._document = this.document;\n\n\t\treturn editableElement;\n\t}\n\n\t/**\n\t * Creates a new {@link module:engine/view/emptyelement~EmptyElement}.\n\t *\n\t *\t\twriter.createEmptyElement( 'img' );\n\t *\t\twriter.createEmptyElement( 'img', { id: 'foo-1234' } );\n\t *\n\t * @param {String} name Name of the element.\n\t * @param {Object} [attributes] Elements attributes.\n\t * @returns {module:engine/view/emptyelement~EmptyElement} Created element.\n\t */\n\tcreateEmptyElement( name, attributes ) {\n\t\treturn new EmptyElement( this.document, name, attributes );\n\t}\n\n\t/**\n\t * Creates a new {@link module:engine/view/uielement~UIElement}.\n\t *\n\t *\t\twriter.createUIElement( 'span' );\n\t *\t\twriter.createUIElement( 'span', { id: 'foo-1234' } );\n\t *\n\t * A custom render function can be provided as the third parameter:\n\t *\n\t *\t\twriter.createUIElement( 'span', null, function( domDocument ) {\n\t *\t\t\tconst domElement = this.toDomElement( domDocument );\n\t *\t\t\tdomElement.innerHTML = '<b>this is ui element</b>';\n\t *\n\t *\t\t\treturn domElement;\n\t *\t\t} );\n\t *\n\t * Unlike {@link #createRawElement raw elements}, UI elements are by no means editor content, for instance,\n\t * they are ignored by the editor selection system.\n\t *\n\t * You should not use UI elements as data containers. Check out {@link #createRawElement} instead.\n\t *\n\t * @param {String} name The name of the element.\n\t * @param {Object} [attributes] Element attributes.\n\t * @param {Function} [renderFunction] A custom render function.\n\t * @returns {module:engine/view/uielement~UIElement} The created element.\n\t */\n\tcreateUIElement( name, attributes, renderFunction ) {\n\t\tconst uiElement = new UIElement( this.document, name, attributes );\n\n\t\tif ( renderFunction ) {\n\t\t\tuiElement.render = renderFunction;\n\t\t}\n\n\t\treturn uiElement;\n\t}\n\n\t/**\n\t * Creates a new {@link module:engine/view/rawelement~RawElement}.\n\t *\n\t *\t\twriter.createRawElement( 'span', { id: 'foo-1234' }, function( domElement ) {\n\t *\t\t\tdomElement.innerHTML = '<b>This is the raw content of the raw element.</b>';\n\t *\t\t} );\n\t *\n\t * Raw elements work as data containers (\"wrappers\", \"sandboxes\") but their children are not managed or\n\t * even recognized by the editor. This encapsulation allows integrations to maintain custom DOM structures\n\t * in the editor content without, for instance, worrying about compatibility with other editor features.\n\t * Raw elements are a perfect tool for integration with external frameworks and data sources.\n\t *\n\t * Unlike {@link #createUIElement UI elements}, raw elements act like \"real\" editor content (similar to\n\t * {@link module:engine/view/containerelement~ContainerElement} or {@link module:engine/view/emptyelement~EmptyElement}),\n\t * and they are considered by the editor selection.\n\t *\n\t * You should not use raw elements to render the UI in the editor content. Check out {@link #createUIElement `#createUIElement()`}\n\t * instead.\n\t *\n\t * @param {String} name The name of the element.\n\t * @param {Object} [attributes] Element attributes.\n\t * @param {Function} [renderFunction] A custom render function.\n\t * @returns {module:engine/view/rawelement~RawElement} The created element.\n\t */\n\tcreateRawElement( name, attributes, renderFunction ) {\n\t\tconst rawElement = new RawElement( this.document, name, attributes );\n\n\t\trawElement.render = renderFunction || ( () => {} );\n\n\t\treturn rawElement;\n\t}\n\n\t/**\n\t * Adds or overwrites the element's attribute with a specified key and value.\n\t *\n\t *\t\twriter.setAttribute( 'href', 'http://ckeditor.com', linkElement );\n\t *\n\t * @param {String} key The attribute key.\n\t * @param {String} value The attribute value.\n\t * @param {module:engine/view/element~Element} element\n\t */\n\tsetAttribute( key, value, element ) {\n\t\telement._setAttribute( key, value );\n\t}\n\n\t/**\n\t * Removes attribute from the element.\n\t *\n\t *\t\twriter.removeAttribute( 'href', linkElement );\n\t *\n\t * @param {String} key Attribute key.\n\t * @param {module:engine/view/element~Element} element\n\t */\n\tremoveAttribute( key, element ) {\n\t\telement._removeAttribute( key );\n\t}\n\n\t/**\n\t * Adds specified class to the element.\n\t *\n\t *\t\twriter.addClass( 'foo', linkElement );\n\t *\t\twriter.addClass( [ 'foo', 'bar' ], linkElement );\n\t *\n\t * @param {Array.<String>|String} className\n\t * @param {module:engine/view/element~Element} element\n\t */\n\taddClass( className, element ) {\n\t\telement._addClass( className );\n\t}\n\n\t/**\n\t * Removes specified class from the element.\n\t *\n\t *\t\twriter.removeClass( 'foo', linkElement );\n\t *\t\twriter.removeClass( [ 'foo', 'bar' ], linkElement );\n\t *\n\t * @param {Array.<String>|String} className\n\t * @param {module:engine/view/element~Element} element\n\t */\n\tremoveClass( className, element ) {\n\t\telement._removeClass( className );\n\t}\n\n\t/**\n\t * Adds style to the element.\n\t *\n\t *\t\twriter.setStyle( 'color', 'red', element );\n\t *\t\twriter.setStyle( {\n\t *\t\t\tcolor: 'red',\n\t *\t\t\tposition: 'fixed'\n\t *\t\t}, element );\n\t *\n\t * **Note**: The passed style can be normalized if\n\t * {@link module:engine/controller/datacontroller~DataController#addStyleProcessorRules a particular style processor rule is enabled}.\n\t * See {@link module:engine/view/stylesmap~StylesMap#set `StylesMap#set()`} for details.\n\t *\n\t * @param {String|Object} property Property name or object with key - value pairs.\n\t * @param {String} [value] Value to set. This parameter is ignored if object is provided as the first parameter.\n\t * @param {module:engine/view/element~Element} element Element to set styles on.\n\t */\n\tsetStyle( property, value, element ) {\n\t\tif ( isPlainObject( property ) && element === undefined ) {\n\t\t\telement = value;\n\t\t}\n\n\t\telement._setStyle( property, value );\n\t}\n\n\t/**\n\t * Removes specified style from the element.\n\t *\n\t *\t\twriter.removeStyle( 'color', element ); // Removes 'color' style.\n\t *\t\twriter.removeStyle( [ 'color', 'border-top' ], element ); // Removes both 'color' and 'border-top' styles.\n\t *\n\t * **Note**: This method can work with normalized style names if\n\t * {@link module:engine/controller/datacontroller~DataController#addStyleProcessorRules a particular style processor rule is enabled}.\n\t * See {@link module:engine/view/stylesmap~StylesMap#remove `StylesMap#remove()`} for details.\n\t *\n\t * @param {Array.<String>|String} property\n\t * @param {module:engine/view/element~Element} element\n\t */\n\tremoveStyle( property, element ) {\n\t\telement._removeStyle( property );\n\t}\n\n\t/**\n\t * Sets a custom property on element. Unlike attributes, custom properties are not rendered to the DOM,\n\t * so they can be used to add special data to elements.\n\t *\n\t * @param {String|Symbol} key\n\t * @param {*} value\n\t * @param {module:engine/view/element~Element} element\n\t */\n\tsetCustomProperty( key, value, element ) {\n\t\telement._setCustomProperty( key, value );\n\t}\n\n\t/**\n\t * Removes a custom property stored under the given key.\n\t *\n\t * @param {String|Symbol} key\n\t * @param {module:engine/view/element~Element} element\n\t * @returns {Boolean} Returns true if property was removed.\n\t */\n\tremoveCustomProperty( key, element ) {\n\t\treturn element._removeCustomProperty( key );\n\t}\n\n\t/**\n\t * Breaks attribute elements at the provided position or at the boundaries of a provided range. It breaks attribute elements\n\t * up to their first ancestor that is a container element.\n\t *\n\t * In following examples `<p>` is a container, `<b>` and `<u>` are attribute elements:\n\t *\n\t *\t\t<p>foo<b><u>bar{}</u></b></p> -> <p>foo<b><u>bar</u></b>[]</p>\n\t *\t\t<p>foo<b><u>{}bar</u></b></p> -> <p>foo{}<b><u>bar</u></b></p>\n\t *\t\t<p>foo<b><u>b{}ar</u></b></p> -> <p>foo<b><u>b</u></b>[]<b><u>ar</u></b></p>\n\t *\t\t<p><b>fo{o</b><u>ba}r</u></p> -> <p><b>fo</b><b>o</b><u>ba</u><u>r</u></b></p>\n\t *\n\t * **Note:** {@link module:engine/view/documentfragment~DocumentFragment DocumentFragment} is treated like a container.\n\t *\n\t * **Note:** The difference between {@link module:engine/view/downcastwriter~DowncastWriter#breakAttributes breakAttributes()} and\n\t * {@link module:engine/view/downcastwriter~DowncastWriter#breakContainer breakContainer()} is that `breakAttributes()` breaks all\n\t * {@link module:engine/view/attributeelement~AttributeElement attribute elements} that are ancestors of a given `position`,\n\t * up to the first encountered {@link module:engine/view/containerelement~ContainerElement container element}.\n\t * `breakContainer()` assumes that a given `position` is directly in the container element and breaks that container element.\n\t *\n\t * Throws the `view-writer-invalid-range-container` {@link module:utils/ckeditorerror~CKEditorError CKEditorError}\n\t * when the {@link module:engine/view/range~Range#start start}\n\t * and {@link module:engine/view/range~Range#end end} positions of a passed range are not placed inside same parent container.\n\t *\n\t * Throws the `view-writer-cannot-break-empty-element` {@link module:utils/ckeditorerror~CKEditorError CKEditorError}\n\t * when trying to break attributes inside an {@link module:engine/view/emptyelement~EmptyElement EmptyElement}.\n\t *\n\t * Throws the `view-writer-cannot-break-ui-element` {@link module:utils/ckeditorerror~CKEditorError CKEditorError}\n\t * when trying to break attributes inside a {@link module:engine/view/uielement~UIElement UIElement}.\n\t *\n\t * @see module:engine/view/attributeelement~AttributeElement\n\t * @see module:engine/view/containerelement~ContainerElement\n\t * @see module:engine/view/downcastwriter~DowncastWriter#breakContainer\n\t * @param {module:engine/view/position~Position|module:engine/view/range~Range} positionOrRange The position where\n\t * to break attribute elements.\n\t * @returns {module:engine/view/position~Position|module:engine/view/range~Range} The new position or range, after breaking the\n\t * attribute elements.\n\t */\n\tbreakAttributes( positionOrRange ) {\n\t\tif ( positionOrRange instanceof Position ) {\n\t\t\treturn this._breakAttributes( positionOrRange );\n\t\t} else {\n\t\t\treturn this._breakAttributesRange( positionOrRange );\n\t\t}\n\t}\n\n\t/**\n\t * Breaks a {@link module:engine/view/containerelement~ContainerElement container view element} into two, at the given position.\n\t * The position has to be directly inside the container element and cannot be in the root. It does not break the conrainer view element\n\t * if the position is at the beginning or at the end of its parent element.\n\t *\n\t *\t\t<p>foo^bar</p> -> <p>foo</p><p>bar</p>\n\t *\t\t<div><p>foo</p>^<p>bar</p></div> -> <div><p>foo</p></div><div><p>bar</p></div>\n\t *\t\t<p>^foobar</p> -> ^<p>foobar</p>\n\t *\t\t<p>foobar^</p> -> <p>foobar</p>^\n\t *\n\t * **Note:** The difference between {@link module:engine/view/downcastwriter~DowncastWriter#breakAttributes breakAttributes()} and\n\t * {@link module:engine/view/downcastwriter~DowncastWriter#breakContainer breakContainer()} is that `breakAttributes()` breaks all\n\t * {@link module:engine/view/attributeelement~AttributeElement attribute elements} that are ancestors of a given `position`,\n\t * up to the first encountered {@link module:engine/view/containerelement~ContainerElement container element}.\n\t * `breakContainer()` assumes that the given `position` is directly in the container element and breaks that container element.\n\t *\n\t * @see module:engine/view/attributeelement~AttributeElement\n\t * @see module:engine/view/containerelement~ContainerElement\n\t * @see module:engine/view/downcastwriter~DowncastWriter#breakAttributes\n\t * @param {module:engine/view/position~Position} position The position where to break the element.\n\t * @returns {module:engine/view/position~Position} The position between broken elements. If an element has not been broken,\n\t * the returned position is placed either before or after it.\n\t */\n\tbreakContainer( position ) {\n\t\tconst element = position.parent;\n\n\t\tif ( !( element.is( 'containerElement' ) ) ) {\n\t\t\t/**\n\t\t\t * Trying to break an element which is not a container element.\n\t\t\t *\n\t\t\t * @error view-writer-break-non-container-element\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'view-writer-break-non-container-element', this.document );\n\t\t}\n\n\t\tif ( !element.parent ) {\n\t\t\t/**\n\t\t\t * Trying to break root element.\n\t\t\t *\n\t\t\t * @error view-writer-break-root\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'view-writer-break-root', this.document );\n\t\t}\n\n\t\tif ( position.isAtStart ) {\n\t\t\treturn Position._createBefore( element );\n\t\t} else if ( !position.isAtEnd ) {\n\t\t\tconst newElement = element._clone( false );\n\n\t\t\tthis.insert( Position._createAfter( element ), newElement );\n\n\t\t\tconst sourceRange = new Range( position, Position._createAt( element, 'end' ) );\n\t\t\tconst targetPosition = new Position( newElement, 0 );\n\n\t\t\tthis.move( sourceRange, targetPosition );\n\t\t}\n\n\t\treturn Position._createAfter( element );\n\t}\n\n\t/**\n\t * Merges {@link module:engine/view/attributeelement~AttributeElement attribute elements}. It also merges text nodes if needed.\n\t * Only {@link module:engine/view/attributeelement~AttributeElement#isSimilar similar} attribute elements can be merged.\n\t *\n\t * In following examples `<p>` is a container and `<b>` is an attribute element:\n\t *\n\t *\t\t<p>foo[]bar</p> -> <p>foo{}bar</p>\n\t *\t\t<p><b>foo</b>[]<b>bar</b></p> -> <p><b>foo{}bar</b></p>\n\t *\t\t<p><b foo=\"bar\">a</b>[]<b foo=\"baz\">b</b></p> -> <p><b foo=\"bar\">a</b>[]<b foo=\"baz\">b</b></p>\n\t *\n\t * It will also take care about empty attributes when merging:\n\t *\n\t *\t\t<p><b>[]</b></p> -> <p>[]</p>\n\t *\t\t<p><b>foo</b><i>[]</i><b>bar</b></p> -> <p><b>foo{}bar</b></p>\n\t *\n\t * **Note:** Difference between {@link module:engine/view/downcastwriter~DowncastWriter#mergeAttributes mergeAttributes} and\n\t * {@link module:engine/view/downcastwriter~DowncastWriter#mergeContainers mergeContainers} is that `mergeAttributes` merges two\n\t * {@link module:engine/view/attributeelement~AttributeElement attribute elements} or {@link module:engine/view/text~Text text nodes}\n\t * while `mergeContainer` merges two {@link module:engine/view/containerelement~ContainerElement container elements}.\n\t *\n\t * @see module:engine/view/attributeelement~AttributeElement\n\t * @see module:engine/view/containerelement~ContainerElement\n\t * @see module:engine/view/downcastwriter~DowncastWriter#mergeContainers\n\t * @param {module:engine/view/position~Position} position Merge position.\n\t * @returns {module:engine/view/position~Position} Position after merge.\n\t */\n\tmergeAttributes( position ) {\n\t\tconst positionOffset = position.offset;\n\t\tconst positionParent = position.parent;\n\n\t\t// When inside text node - nothing to merge.\n\t\tif ( positionParent.is( '$text' ) ) {\n\t\t\treturn position;\n\t\t}\n\n\t\t// When inside empty attribute - remove it.\n\t\tif ( positionParent.is( 'attributeElement' ) && positionParent.childCount === 0 ) {\n\t\t\tconst parent = positionParent.parent;\n\t\t\tconst offset = positionParent.index;\n\n\t\t\tpositionParent._remove();\n\t\t\tthis._removeFromClonedElementsGroup( positionParent );\n\n\t\t\treturn this.mergeAttributes( new Position( parent, offset ) );\n\t\t}\n\n\t\tconst nodeBefore = positionParent.getChild( positionOffset - 1 );\n\t\tconst nodeAfter = positionParent.getChild( positionOffset );\n\n\t\t// Position should be placed between two nodes.\n\t\tif ( !nodeBefore || !nodeAfter ) {\n\t\t\treturn position;\n\t\t}\n\n\t\t// When position is between two text nodes.\n\t\tif ( nodeBefore.is( '$text' ) && nodeAfter.is( '$text' ) ) {\n\t\t\treturn mergeTextNodes( nodeBefore, nodeAfter );\n\t\t}\n\t\t// When position is between two same attribute elements.\n\t\telse if ( nodeBefore.is( 'attributeElement' ) && nodeAfter.is( 'attributeElement' ) && nodeBefore.isSimilar( nodeAfter ) ) {\n\t\t\t// Move all children nodes from node placed after selection and remove that node.\n\t\t\tconst count = nodeBefore.childCount;\n\t\t\tnodeBefore._appendChild( nodeAfter.getChildren() );\n\n\t\t\tnodeAfter._remove();\n\t\t\tthis._removeFromClonedElementsGroup( nodeAfter );\n\n\t\t\t// New position is located inside the first node, before new nodes.\n\t\t\t// Call this method recursively to merge again if needed.\n\t\t\treturn this.mergeAttributes( new Position( nodeBefore, count ) );\n\t\t}\n\n\t\treturn position;\n\t}\n\n\t/**\n\t * Merges two {@link module:engine/view/containerelement~ContainerElement container elements} that are before and after given position.\n\t * Precisely, the element after the position is removed and it's contents are moved to element before the position.\n\t *\n\t *\t\t<p>foo</p>^<p>bar</p> -> <p>foo^bar</p>\n\t *\t\t<div>foo</div>^<p>bar</p> -> <div>foo^bar</div>\n\t *\n\t * **Note:** Difference between {@link module:engine/view/downcastwriter~DowncastWriter#mergeAttributes mergeAttributes} and\n\t * {@link module:engine/view/downcastwriter~DowncastWriter#mergeContainers mergeContainers} is that `mergeAttributes` merges two\n\t * {@link module:engine/view/attributeelement~AttributeElement attribute elements} or {@link module:engine/view/text~Text text nodes}\n\t * while `mergeContainer` merges two {@link module:engine/view/containerelement~ContainerElement container elements}.\n\t *\n\t * @see module:engine/view/attributeelement~AttributeElement\n\t * @see module:engine/view/containerelement~ContainerElement\n\t * @see module:engine/view/downcastwriter~DowncastWriter#mergeAttributes\n\t * @param {module:engine/view/position~Position} position Merge position.\n\t * @returns {module:engine/view/position~Position} Position after merge.\n\t */\n\tmergeContainers( position ) {\n\t\tconst prev = position.nodeBefore;\n\t\tconst next = position.nodeAfter;\n\n\t\tif ( !prev || !next || !prev.is( 'containerElement' ) || !next.is( 'containerElement' ) ) {\n\t\t\t/**\n\t\t\t * Element before and after given position cannot be merged.\n\t\t\t *\n\t\t\t * @error view-writer-merge-containers-invalid-position\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'view-writer-merge-containers-invalid-position', this.document );\n\t\t}\n\n\t\tconst lastChild = prev.getChild( prev.childCount - 1 );\n\t\tconst newPosition = lastChild instanceof Text ? Position._createAt( lastChild, 'end' ) : Position._createAt( prev, 'end' );\n\n\t\tthis.move( Range._createIn( next ), Position._createAt( prev, 'end' ) );\n\t\tthis.remove( Range._createOn( next ) );\n\n\t\treturn newPosition;\n\t}\n\n\t/**\n\t * Inserts a node or nodes at specified position. Takes care about breaking attributes before insertion\n\t * and merging them afterwards.\n\t *\n\t * Throws {@link module:utils/ckeditorerror~CKEditorError CKEditorError} `view-writer-insert-invalid-node` when nodes to insert\n\t * contains instances that are not {@link module:engine/view/text~Text Texts},\n\t * {@link module:engine/view/attributeelement~AttributeElement AttributeElements},\n\t * {@link module:engine/view/containerelement~ContainerElement ContainerElements},\n\t * {@link module:engine/view/emptyelement~EmptyElement EmptyElements},\n\t * {@link module:engine/view/rawelement~RawElement RawElements} or\n\t * {@link module:engine/view/uielement~UIElement UIElements}.\n\t *\n\t * @param {module:engine/view/position~Position} position Insertion position.\n\t * @param {module:engine/view/text~Text|module:engine/view/attributeelement~AttributeElement|\n\t * module:engine/view/containerelement~ContainerElement|module:engine/view/emptyelement~EmptyElement|\n\t * module:engine/view/rawelement~RawElement|module:engine/view/uielement~UIElement|\n\t * Iterable.<module:engine/view/text~Text|\n\t * module:engine/view/attributeelement~AttributeElement|module:engine/view/containerelement~ContainerElement|\n\t * module:engine/view/emptyelement~EmptyElement|module:engine/view/rawelement~RawElement|\n\t * module:engine/view/uielement~UIElement>} nodes Node or nodes to insert.\n\t * @returns {module:engine/view/range~Range} Range around inserted nodes.\n\t */\n\tinsert( position, nodes ) {\n\t\tnodes = isIterable( nodes ) ? [ ...nodes ] : [ nodes ];\n\n\t\t// Check if nodes to insert are instances of AttributeElements, ContainerElements, EmptyElements, UIElements or Text.\n\t\tvalidateNodesToInsert( nodes, this.document );\n\n\t\tconst container = getParentContainer( position );\n\n\t\tif ( !container ) {\n\t\t\t/**\n\t\t\t * Position's parent container cannot be found.\n\t\t\t *\n\t\t\t * @error view-writer-invalid-position-container\n\t\t\t */\n\t\t\tthrow new CKEditorError(\n\t\t\t\t'view-writer-invalid-position-container',\n\t\t\t\tthis.document\n\t\t\t);\n\t\t}\n\n\t\tconst insertionPosition = this._breakAttributes( position, true );\n\t\tconst length = container._insertChild( insertionPosition.offset, nodes );\n\n\t\tfor ( const node of nodes ) {\n\t\t\tthis._addToClonedElementsGroup( node );\n\t\t}\n\n\t\tconst endPosition = insertionPosition.getShiftedBy( length );\n\t\tconst start = this.mergeAttributes( insertionPosition );\n\n\t\t// When no nodes were inserted - return collapsed range.\n\t\tif ( length === 0 ) {\n\t\t\treturn new Range( start, start );\n\t\t} else {\n\t\t\t// If start position was merged - move end position.\n\t\t\tif ( !start.isEqual( insertionPosition ) ) {\n\t\t\t\tendPosition.offset--;\n\t\t\t}\n\n\t\t\tconst end = this.mergeAttributes( endPosition );\n\n\t\t\treturn new Range( start, end );\n\t\t}\n\t}\n\n\t/**\n\t * Removes provided range from the container.\n\t *\n\t * Throws {@link module:utils/ckeditorerror~CKEditorError CKEditorError} `view-writer-invalid-range-container` when\n\t * {@link module:engine/view/range~Range#start start} and {@link module:engine/view/range~Range#end end} positions are not placed inside\n\t * same parent container.\n\t *\n\t * @param {module:engine/view/range~Range|module:engine/view/item~Item} rangeOrItem Range to remove from container\n\t * or an {@link module:engine/view/item~Item item} to remove. If range is provided, after removing, it will be updated\n\t * to a collapsed range showing the new position.\n\t * @returns {module:engine/view/documentfragment~DocumentFragment} Document fragment containing removed nodes.\n\t */\n\tremove( rangeOrItem ) {\n\t\tconst range = rangeOrItem instanceof Range ? rangeOrItem : Range._createOn( rangeOrItem );\n\n\t\tvalidateRangeContainer( range, this.document );\n\n\t\t// If range is collapsed - nothing to remove.\n\t\tif ( range.isCollapsed ) {\n\t\t\treturn new DocumentFragment( this.document );\n\t\t}\n\n\t\t// Break attributes at range start and end.\n\t\tconst { start: breakStart, end: breakEnd } = this._breakAttributesRange( range, true );\n\t\tconst parentContainer = breakStart.parent;\n\n\t\tconst count = breakEnd.offset - breakStart.offset;\n\n\t\t// Remove nodes in range.\n\t\tconst removed = parentContainer._removeChildren( breakStart.offset, count );\n\n\t\tfor ( const node of removed ) {\n\t\t\tthis._removeFromClonedElementsGroup( node );\n\t\t}\n\n\t\t// Merge after removing.\n\t\tconst mergePosition = this.mergeAttributes( breakStart );\n\t\trange.start = mergePosition;\n\t\trange.end = mergePosition.clone();\n\n\t\t// Return removed nodes.\n\t\treturn new DocumentFragment( this.document, removed );\n\t}\n\n\t/**\n\t * Removes matching elements from given range.\n\t *\n\t * Throws {@link module:utils/ckeditorerror~CKEditorError CKEditorError} `view-writer-invalid-range-container` when\n\t * {@link module:engine/view/range~Range#start start} and {@link module:engine/view/range~Range#end end} positions are not placed inside\n\t * same parent container.\n\t *\n\t * @param {module:engine/view/range~Range} range Range to clear.\n\t * @param {module:engine/view/element~Element} element Element to remove.\n\t */\n\tclear( range, element ) {\n\t\tvalidateRangeContainer( range, this.document );\n\n\t\t// Create walker on given range.\n\t\t// We walk backward because when we remove element during walk it modifies range end position.\n\t\tconst walker = range.getWalker( {\n\t\t\tdirection: 'backward',\n\t\t\tignoreElementEnd: true\n\t\t} );\n\n\t\t// Let's walk.\n\t\tfor ( const current of walker ) {\n\t\t\tconst item = current.item;\n\t\t\tlet rangeToRemove;\n\n\t\t\t// When current item matches to the given element.\n\t\t\tif ( item.is( 'element' ) && element.isSimilar( item ) ) {\n\t\t\t\t// Create range on this element.\n\t\t\t\trangeToRemove = Range._createOn( item );\n\t\t\t\t// When range starts inside Text or TextProxy element.\n\t\t\t} else if ( !current.nextPosition.isAfter( range.start ) && item.is( '$textProxy' ) ) {\n\t\t\t\t// We need to check if parent of this text matches to given element.\n\t\t\t\tconst parentElement = item.getAncestors().find( ancestor => {\n\t\t\t\t\treturn ancestor.is( 'element' ) && element.isSimilar( ancestor );\n\t\t\t\t} );\n\n\t\t\t\t// If it is then create range inside this element.\n\t\t\t\tif ( parentElement ) {\n\t\t\t\t\trangeToRemove = Range._createIn( parentElement );\n\t\t\t\t}\n\t\t\t}\n\n\t\t\t// If we have found element to remove.\n\t\t\tif ( rangeToRemove ) {\n\t\t\t\t// We need to check if element range stick out of the given range and truncate if it is.\n\t\t\t\tif ( rangeToRemove.end.isAfter( range.end ) ) {\n\t\t\t\t\trangeToRemove.end = range.end;\n\t\t\t\t}\n\n\t\t\t\tif ( rangeToRemove.start.isBefore( range.start ) ) {\n\t\t\t\t\trangeToRemove.start = range.start;\n\t\t\t\t}\n\n\t\t\t\t// At the end we remove range with found element.\n\t\t\t\tthis.remove( rangeToRemove );\n\t\t\t}\n\t\t}\n\t}\n\n\t/**\n\t * Moves nodes from provided range to target position.\n\t *\n\t * Throws {@link module:utils/ckeditorerror~CKEditorError CKEditorError} `view-writer-invalid-range-container` when\n\t * {@link module:engine/view/range~Range#start start} and {@link module:engine/view/range~Range#end end} positions are not placed inside\n\t * same parent container.\n\t *\n\t * @param {module:engine/view/range~Range} sourceRange Range containing nodes to move.\n\t * @param {module:engine/view/position~Position} targetPosition Position to insert.\n\t * @returns {module:engine/view/range~Range} Range in target container. Inserted nodes are placed between\n\t * {@link module:engine/view/range~Range#start start} and {@link module:engine/view/range~Range#end end} positions.\n\t */\n\tmove( sourceRange, targetPosition ) {\n\t\tlet nodes;\n\n\t\tif ( targetPosition.isAfter( sourceRange.end ) ) {\n\t\t\ttargetPosition = this._breakAttributes( targetPosition, true );\n\n\t\t\tconst parent = targetPosition.parent;\n\t\t\tconst countBefore = parent.childCount;\n\n\t\t\tsourceRange = this._breakAttributesRange( sourceRange, true );\n\n\t\t\tnodes = this.remove( sourceRange );\n\n\t\t\ttargetPosition.offset += ( parent.childCount - countBefore );\n\t\t} else {\n\t\t\tnodes = this.remove( sourceRange );\n\t\t}\n\n\t\treturn this.insert( targetPosition, nodes );\n\t}\n\n\t/**\n\t * Wraps elements within range with provided {@link module:engine/view/attributeelement~AttributeElement AttributeElement}.\n\t * If a collapsed range is provided, it will be wrapped only if it is equal to view selection.\n\t *\n\t * If a collapsed range was passed and is same as selection, the selection\n\t * will be moved to the inside of the wrapped attribute element.\n\t *\n\t * Throws {@link module:utils/ckeditorerror~CKEditorError} `view-writer-invalid-range-container`\n\t * when {@link module:engine/view/range~Range#start}\n\t * and {@link module:engine/view/range~Range#end} positions are not placed inside same parent container.\n\t *\n\t * Throws {@link module:utils/ckeditorerror~CKEditorError} `view-writer-wrap-invalid-attribute` when passed attribute element is not\n\t * an instance of {@link module:engine/view/attributeelement~AttributeElement AttributeElement}.\n\t *\n\t * Throws {@link module:utils/ckeditorerror~CKEditorError} `view-writer-wrap-nonselection-collapsed-range` when passed range\n\t * is collapsed and different than view selection.\n\t *\n\t * @param {module:engine/view/range~Range} range Range to wrap.\n\t * @param {module:engine/view/attributeelement~AttributeElement} attribute Attribute element to use as wrapper.\n\t * @returns {module:engine/view/range~Range} range Range after wrapping, spanning over wrapping attribute element.\n\t */\n\twrap( range, attribute ) {\n\t\tif ( !( attribute instanceof AttributeElement ) ) {\n\t\t\tthrow new CKEditorError(\n\t\t\t\t'view-writer-wrap-invalid-attribute',\n\t\t\t\tthis.document\n\t\t\t);\n\t\t}\n\n\t\tvalidateRangeContainer( range, this.document );\n\n\t\tif ( !range.isCollapsed ) {\n\t\t\t// Non-collapsed range. Wrap it with the attribute element.\n\t\t\treturn this._wrapRange( range, attribute );\n\t\t} else {\n\t\t\t// Collapsed range. Wrap position.\n\t\t\tlet position = range.start;\n\n\t\t\tif ( position.parent.is( 'element' ) && !_hasNonUiChildren( position.parent ) ) {\n\t\t\t\tposition = position.getLastMatchingPosition( value => value.item.is( 'uiElement' ) );\n\t\t\t}\n\n\t\t\tposition = this._wrapPosition( position, attribute );\n\t\t\tconst viewSelection = this.document.selection;\n\n\t\t\t// If wrapping position is equal to view selection, move view selection inside wrapping attribute element.\n\t\t\tif ( viewSelection.isCollapsed && viewSelection.getFirstPosition().isEqual( range.start ) ) {\n\t\t\t\tthis.setSelection( position );\n\t\t\t}\n\n\t\t\treturn new Range( position );\n\t\t}\n\t}\n\n\t/**\n\t * Unwraps nodes within provided range from attribute element.\n\t *\n\t * Throws {@link module:utils/ckeditorerror~CKEditorError CKEditorError} `view-writer-invalid-range-container` when\n\t * {@link module:engine/view/range~Range#start start} and {@link module:engine/view/range~Range#end end} positions are not placed inside\n\t * same parent container.\n\t *\n\t * @param {module:engine/view/range~Range} range\n\t * @param {module:engine/view/attributeelement~AttributeElement} attribute\n\t */\n\tunwrap( range, attribute ) {\n\t\tif ( !( attribute instanceof AttributeElement ) ) {\n\t\t\t/**\n\t\t\t * The `attribute` passed to {@link module:engine/view/downcastwriter~DowncastWriter#unwrap `DowncastWriter#unwrap()`}\n\t\t\t * must be an instance of {@link module:engine/view/attributeelement~AttributeElement `AttributeElement`}.\n\t\t\t *\n\t\t\t * @error view-writer-unwrap-invalid-attribute\n\t\t\t */\n\t\t\tthrow new CKEditorError(\n\t\t\t\t'view-writer-unwrap-invalid-attribute',\n\t\t\t\tthis.document\n\t\t\t);\n\t\t}\n\n\t\tvalidateRangeContainer( range, this.document );\n\n\t\t// If range is collapsed - nothing to unwrap.\n\t\tif ( range.isCollapsed ) {\n\t\t\treturn range;\n\t\t}\n\n\t\t// Break attributes at range start and end.\n\t\tconst { start: breakStart, end: breakEnd } = this._breakAttributesRange( range, true );\n\t\tconst parentContainer = breakStart.parent;\n\n\t\t// Unwrap children located between break points.\n\t\tconst newRange = this._unwrapChildren( parentContainer, breakStart.offset, breakEnd.offset, attribute );\n\n\t\t// Merge attributes at the both ends and return a new range.\n\t\tconst start = this.mergeAttributes( newRange.start );\n\n\t\t// If start position was merged - move end position back.\n\t\tif ( !start.isEqual( newRange.start ) ) {\n\t\t\tnewRange.end.offset--;\n\t\t}\n\n\t\tconst end = this.mergeAttributes( newRange.end );\n\n\t\treturn new Range( start, end );\n\t}\n\n\t/**\n\t * Renames element by creating a copy of renamed element but with changed name and then moving contents of the\n\t * old element to the new one. Keep in mind that this will invalidate all {@link module:engine/view/position~Position positions} which\n\t * has renamed element as {@link module:engine/view/position~Position#parent a parent}.\n\t *\n\t * New element has to be created because `Element#tagName` property in DOM is readonly.\n\t *\n\t * Since this function creates a new element and removes the given one, the new element is returned to keep reference.\n\t *\n\t * @param {String} newName New name for element.\n\t * @param {module:engine/view/containerelement~ContainerElement} viewElement Element to be renamed.\n\t */\n\trename( newName, viewElement ) {\n\t\tconst newElement = new ContainerElement( this.document, newName, viewElement.getAttributes() );\n\n\t\tthis.insert( Position._createAfter( viewElement ), newElement );\n\t\tthis.move( Range._createIn( viewElement ), Position._createAt( newElement, 0 ) );\n\t\tthis.remove( Range._createOn( viewElement ) );\n\n\t\treturn newElement;\n\t}\n\n\t/**\n\t * Cleans up memory by removing obsolete cloned elements group from the writer.\n\t *\n\t * Should be used whenever all {@link module:engine/view/attributeelement~AttributeElement attribute elements}\n\t * with the same {@link module:engine/view/attributeelement~AttributeElement#id id} are going to be removed from the view and\n\t * the group will no longer be needed.\n\t *\n\t * Cloned elements group are not removed automatically in case if the group is still needed after all its elements\n\t * were removed from the view.\n\t *\n\t * Keep in mind that group names are equal to the `id` property of the attribute element.\n\t *\n\t * @param {String} groupName Name of the group to clear.\n\t */\n\tclearClonedElementsGroup( groupName ) {\n\t\tthis._cloneGroups.delete( groupName );\n\t}\n\n\t/**\n\t * Creates position at the given location. The location can be specified as:\n\t *\n\t * * a {@link module:engine/view/position~Position position},\n\t * * parent element and offset (offset defaults to `0`),\n\t * * parent element and `'end'` (sets position at the end of that element),\n\t * * {@link module:engine/view/item~Item view item} and `'before'` or `'after'` (sets position before or after given view item).\n\t *\n\t * This method is a shortcut to other constructors such as:\n\t *\n\t * * {@link #createPositionBefore},\n\t * * {@link #createPositionAfter},\n\t *\n\t * @param {module:engine/view/item~Item|module:engine/model/position~Position} itemOrPosition\n\t * @param {Number|'end'|'before'|'after'} [offset] Offset or one of the flags. Used only when\n\t * first parameter is a {@link module:engine/view/item~Item view item}.\n\t */\n\tcreatePositionAt( itemOrPosition, offset ) {\n\t\treturn Position._createAt( itemOrPosition, offset );\n\t}\n\n\t/**\n\t * Creates a new position after given view item.\n\t *\n\t * @param {module:engine/view/item~Item} item View item after which the position should be located.\n\t * @returns {module:engine/view/position~Position}\n\t */\n\tcreatePositionAfter( item ) {\n\t\treturn Position._createAfter( item );\n\t}\n\n\t/**\n\t * Creates a new position before given view item.\n\t *\n\t * @param {module:engine/view/item~Item} item View item before which the position should be located.\n\t * @returns {module:engine/view/position~Position}\n\t */\n\tcreatePositionBefore( item ) {\n\t\treturn Position._createBefore( item );\n\t}\n\n\t/**\n\t * Creates a range spanning from `start` position to `end` position.\n\t *\n\t * **Note:** This factory method creates its own {@link module:engine/view/position~Position} instances basing on passed values.\n\t *\n\t * @param {module:engine/view/position~Position} start Start position.\n\t * @param {module:engine/view/position~Position} [end] End position. If not set, range will be collapsed at `start` position.\n\t * @returns {module:engine/view/range~Range}\n\t */\n\tcreateRange( start, end ) {\n\t\treturn new Range( start, end );\n\t}\n\n\t/**\n\t * Creates a range that starts before given {@link module:engine/view/item~Item view item} and ends after it.\n\t *\n\t * @param {module:engine/view/item~Item} item\n\t * @returns {module:engine/view/range~Range}\n\t */\n\tcreateRangeOn( item ) {\n\t\treturn Range._createOn( item );\n\t}\n\n\t/**\n\t * Creates a range inside an {@link module:engine/view/element~Element element} which starts before the first child of\n\t * that element and ends after the last child of that element.\n\t *\n\t * @param {module:engine/view/element~Element} element Element which is a parent for the range.\n\t * @returns {module:engine/view/range~Range}\n\t */\n\tcreateRangeIn( element ) {\n\t\treturn Range._createIn( element );\n\t}\n\n\t/**\n\t Creates new {@link module:engine/view/selection~Selection} instance.\n\t *\n\t * \t\t// Creates empty selection without ranges.\n\t *\t\tconst selection = writer.createSelection();\n\t *\n\t *\t\t// Creates selection at the given range.\n\t *\t\tconst range = writer.createRange( start, end );\n\t *\t\tconst selection = writer.createSelection( range );\n\t *\n\t *\t\t// Creates selection at the given ranges\n\t * \t\tconst ranges = [ writer.createRange( start1, end2 ), writer.createRange( star2, end2 ) ];\n\t *\t\tconst selection = writer.createSelection( ranges );\n\t *\n\t *\t\t// Creates selection from the other selection.\n\t *\t\tconst otherSelection = writer.createSelection();\n\t *\t\tconst selection = writer.createSelection( otherSelection );\n\t *\n\t *\t\t// Creates selection from the document selection.\n\t *\t\tconst selection = writer.createSelection( editor.editing.view.document.selection );\n\t *\n\t * \t\t// Creates selection at the given position.\n\t *\t\tconst position = writer.createPositionFromPath( root, path );\n\t *\t\tconst selection = writer.createSelection( position );\n\t *\n\t *\t\t// Creates collapsed selection at the position of given item and offset.\n\t *\t\tconst paragraph = writer.createContainerElement( 'p' );\n\t *\t\tconst selection = writer.createSelection( paragraph, offset );\n\t *\n\t *\t\t// Creates a range inside an {@link module:engine/view/element~Element element} which starts before the\n\t *\t\t// first child of that element and ends after the last child of that element.\n\t *\t\tconst selection = writer.createSelection( paragraph, 'in' );\n\t *\n\t *\t\t// Creates a range on an {@link module:engine/view/item~Item item} which starts before the item and ends\n\t *\t\t// just after the item.\n\t *\t\tconst selection = writer.createSelection( paragraph, 'on' );\n\t *\n\t * `Selection`'s constructor allow passing additional options (`backward`, `fake` and `label`) as the last argument.\n\t *\n\t *\t\t// Creates backward selection.\n\t *\t\tconst selection = writer.createSelection( range, { backward: true } );\n\t *\n\t * Fake selection does not render as browser native selection over selected elements and is hidden to the user.\n\t * This way, no native selection UI artifacts are displayed to the user and selection over elements can be\n\t * represented in other way, for example by applying proper CSS class.\n\t *\n\t * Additionally fake's selection label can be provided. It will be used to describe fake selection in DOM\n\t * (and be  properly handled by screen readers).\n\t *\n\t *\t\t// Creates fake selection with label.\n\t *\t\tconst selection = writer.createSelection( range, { fake: true, label: 'foo' } );\n\t *\n\t * @param {module:engine/view/selection~Selectable} [selectable=null]\n\t * @param {Number|'before'|'end'|'after'|'on'|'in'} [placeOrOffset] Offset or place when selectable is an `Item`.\n\t * @param {Object} [options]\n\t * @param {Boolean} [options.backward] Sets this selection instance to be backward.\n\t * @param {Boolean} [options.fake] Sets this selection instance to be marked as `fake`.\n\t * @param {String} [options.label] Label for the fake selection.\n\t * @returns {module:engine/view/selection~Selection}\n\t */\n\tcreateSelection( selectable, placeOrOffset, options ) {\n\t\treturn new Selection( selectable, placeOrOffset, options );\n\t}\n\n\t/**\n\t * Wraps children with provided `wrapElement`. Only children contained in `parent` element between\n\t * `startOffset` and `endOffset` will be wrapped.\n\t *\n\t * @private\n\t * @param {module:engine/view/element~Element} parent\n\t * @param {Number} startOffset\n\t * @param {Number} endOffset\n\t * @param {module:engine/view/element~Element} wrapElement\n\t */\n\t_wrapChildren( parent, startOffset, endOffset, wrapElement ) {\n\t\tlet i = startOffset;\n\t\tconst wrapPositions = [];\n\n\t\twhile ( i < endOffset ) {\n\t\t\tconst child = parent.getChild( i );\n\t\t\tconst isText = child.is( '$text' );\n\t\t\tconst isAttribute = child.is( 'attributeElement' );\n\t\t\tconst isEmpty = child.is( 'emptyElement' );\n\t\t\tconst isUI = child.is( 'uiElement' );\n\t\t\tconst isRaw = child.is( 'rawElement' );\n\n\t\t\t//\n\t\t\t// (In all examples, assume that `wrapElement` is `<span class=\"foo\">` element.)\n\t\t\t//\n\t\t\t// Check if `wrapElement` can be joined with the wrapped element. One of requirements is having same name.\n\t\t\t// If possible, join elements.\n\t\t\t//\n\t\t\t// <p><span class=\"bar\">abc</span></p>  -->  <p><span class=\"foo bar\">abc</span></p>\n\t\t\t//\n\t\t\tif ( isAttribute && this._wrapAttributeElement( wrapElement, child ) ) {\n\t\t\t\twrapPositions.push( new Position( parent, i ) );\n\t\t\t}\n\t\t\t//\n\t\t\t// Wrap the child if it is not an attribute element or if it is an attribute element that should be inside\n\t\t\t// `wrapElement` (due to priority).\n\t\t\t//\n\t\t\t// <p>abc</p>                   -->  <p><span class=\"foo\">abc</span></p>\n\t\t\t// <p><strong>abc</strong></p>  -->  <p><span class=\"foo\"><strong>abc</strong></span></p>\n\t\t\telse if ( isText || isEmpty || isUI || isRaw || ( isAttribute && shouldABeOutsideB( wrapElement, child ) ) ) {\n\t\t\t\t// Clone attribute.\n\t\t\t\tconst newAttribute = wrapElement._clone();\n\n\t\t\t\t// Wrap current node with new attribute.\n\t\t\t\tchild._remove();\n\t\t\t\tnewAttribute._appendChild( child );\n\n\t\t\t\tparent._insertChild( i, newAttribute );\n\t\t\t\tthis._addToClonedElementsGroup( newAttribute );\n\n\t\t\t\twrapPositions.push( new Position( parent, i ) );\n\t\t\t}\n\t\t\t//\n\t\t\t// If other nested attribute is found and it wasn't wrapped (see above), continue wrapping inside it.\n\t\t\t//\n\t\t\t// <p><a href=\"foo.html\">abc</a></p>  -->  <p><a href=\"foo.html\"><span class=\"foo\">abc</span></a></p>\n\t\t\t//\n\t\t\telse if ( isAttribute ) {\n\t\t\t\tthis._wrapChildren( child, 0, child.childCount, wrapElement );\n\t\t\t}\n\n\t\t\ti++;\n\t\t}\n\n\t\t// Merge at each wrap.\n\t\tlet offsetChange = 0;\n\n\t\tfor ( const position of wrapPositions ) {\n\t\t\tposition.offset -= offsetChange;\n\n\t\t\t// Do not merge with elements outside selected children.\n\t\t\tif ( position.offset == startOffset ) {\n\t\t\t\tcontinue;\n\t\t\t}\n\n\t\t\tconst newPosition = this.mergeAttributes( position );\n\n\t\t\t// If nodes were merged - other merge offsets will change.\n\t\t\tif ( !newPosition.isEqual( position ) ) {\n\t\t\t\toffsetChange++;\n\t\t\t\tendOffset--;\n\t\t\t}\n\t\t}\n\n\t\treturn Range._createFromParentsAndOffsets( parent, startOffset, parent, endOffset );\n\t}\n\n\t/**\n\t * Unwraps children from provided `unwrapElement`. Only children contained in `parent` element between\n\t * `startOffset` and `endOffset` will be unwrapped.\n\t *\n\t * @private\n\t * @param {module:engine/view/element~Element} parent\n\t * @param {Number} startOffset\n\t * @param {Number} endOffset\n\t * @param {module:engine/view/element~Element} unwrapElement\n\t */\n\t_unwrapChildren( parent, startOffset, endOffset, unwrapElement ) {\n\t\tlet i = startOffset;\n\t\tconst unwrapPositions = [];\n\n\t\t// Iterate over each element between provided offsets inside parent.\n\t\t// We don't use tree walker or range iterator because we will be removing and merging potentially multiple nodes,\n\t\t// so it could get messy. It is safer to it manually in this case.\n\t\twhile ( i < endOffset ) {\n\t\t\tconst child = parent.getChild( i );\n\n\t\t\t// Skip all text nodes. There should be no container element's here either.\n\t\t\tif ( !child.is( 'attributeElement' ) ) {\n\t\t\t\ti++;\n\n\t\t\t\tcontinue;\n\t\t\t}\n\n\t\t\t//\n\t\t\t// (In all examples, assume that `unwrapElement` is `<span class=\"foo\">` element.)\n\t\t\t//\n\t\t\t// If the child is similar to the given attribute element, unwrap it - it will be completely removed.\n\t\t\t//\n\t\t\t// <p><span class=\"foo\">abc</span>xyz</p>  -->  <p>abcxyz</p>\n\t\t\t//\n\t\t\tif ( child.isSimilar( unwrapElement ) ) {\n\t\t\t\tconst unwrapped = child.getChildren();\n\t\t\t\tconst count = child.childCount;\n\n\t\t\t\t// Replace wrapper element with its children\n\t\t\t\tchild._remove();\n\t\t\t\tparent._insertChild( i, unwrapped );\n\n\t\t\t\tthis._removeFromClonedElementsGroup( child );\n\n\t\t\t\t// Save start and end position of moved items.\n\t\t\t\tunwrapPositions.push(\n\t\t\t\t\tnew Position( parent, i ),\n\t\t\t\t\tnew Position( parent, i + count )\n\t\t\t\t);\n\n\t\t\t\t// Skip elements that were unwrapped. Assuming there won't be another element to unwrap in child elements.\n\t\t\t\ti += count;\n\t\t\t\tendOffset += count - 1;\n\n\t\t\t\tcontinue;\n\t\t\t}\n\n\t\t\t//\n\t\t\t// If the child is not similar but is an attribute element, try partial unwrapping - remove the same attributes/styles/classes.\n\t\t\t// Partial unwrapping will happen only if the elements have the same name.\n\t\t\t//\n\t\t\t// <p><span class=\"foo bar\">abc</span>xyz</p>  -->  <p><span class=\"bar\">abc</span>xyz</p>\n\t\t\t// <p><i class=\"foo\">abc</i>xyz</p>            -->  <p><i class=\"foo\">abc</i>xyz</p>\n\t\t\t//\n\t\t\tif ( this._unwrapAttributeElement( unwrapElement, child ) ) {\n\t\t\t\tunwrapPositions.push(\n\t\t\t\t\tnew Position( parent, i ),\n\t\t\t\t\tnew Position( parent, i + 1 )\n\t\t\t\t);\n\n\t\t\t\ti++;\n\n\t\t\t\tcontinue;\n\t\t\t}\n\n\t\t\t//\n\t\t\t// If other nested attribute is found, look through it's children for elements to unwrap.\n\t\t\t//\n\t\t\t// <p><i><span class=\"foo\">abc</span></i><p>  -->  <p><i>abc</i><p>\n\t\t\t//\n\t\t\tthis._unwrapChildren( child, 0, child.childCount, unwrapElement );\n\n\t\t\ti++;\n\t\t}\n\n\t\t// Merge at each unwrap.\n\t\tlet offsetChange = 0;\n\n\t\tfor ( const position of unwrapPositions ) {\n\t\t\tposition.offset -= offsetChange;\n\n\t\t\t// Do not merge with elements outside selected children.\n\t\t\tif ( position.offset == startOffset || position.offset == endOffset ) {\n\t\t\t\tcontinue;\n\t\t\t}\n\n\t\t\tconst newPosition = this.mergeAttributes( position );\n\n\t\t\t// If nodes were merged - other merge offsets will change.\n\t\t\tif ( !newPosition.isEqual( position ) ) {\n\t\t\t\toffsetChange++;\n\t\t\t\tendOffset--;\n\t\t\t}\n\t\t}\n\n\t\treturn Range._createFromParentsAndOffsets( parent, startOffset, parent, endOffset );\n\t}\n\n\t/**\n\t * Helper function for `view.writer.wrap`. Wraps range with provided attribute element.\n\t * This method will also merge newly added attribute element with its siblings whenever possible.\n\t *\n\t * Throws {@link module:utils/ckeditorerror~CKEditorError} `view-writer-wrap-invalid-attribute` when passed attribute element is not\n\t * an instance of {@link module:engine/view/attributeelement~AttributeElement AttributeElement}.\n\t *\n\t * @private\n\t * @param {module:engine/view/range~Range} range\n\t * @param {module:engine/view/attributeelement~AttributeElement} attribute\n\t * @returns {module:engine/view/range~Range} New range after wrapping, spanning over wrapping attribute element.\n\t */\n\t_wrapRange( range, attribute ) {\n\t\t// Break attributes at range start and end.\n\t\tconst { start: breakStart, end: breakEnd } = this._breakAttributesRange( range, true );\n\t\tconst parentContainer = breakStart.parent;\n\n\t\t// Wrap all children with attribute.\n\t\tconst newRange = this._wrapChildren( parentContainer, breakStart.offset, breakEnd.offset, attribute );\n\n\t\t// Merge attributes at the both ends and return a new range.\n\t\tconst start = this.mergeAttributes( newRange.start );\n\n\t\t// If start position was merged - move end position back.\n\t\tif ( !start.isEqual( newRange.start ) ) {\n\t\t\tnewRange.end.offset--;\n\t\t}\n\t\tconst end = this.mergeAttributes( newRange.end );\n\n\t\treturn new Range( start, end );\n\t}\n\n\t/**\n\t * Helper function for {@link #wrap}. Wraps position with provided attribute element.\n\t * This method will also merge newly added attribute element with its siblings whenever possible.\n\t *\n\t * Throws {@link module:utils/ckeditorerror~CKEditorError} `view-writer-wrap-invalid-attribute` when passed attribute element is not\n\t * an instance of {@link module:engine/view/attributeelement~AttributeElement AttributeElement}.\n\t *\n\t * @private\n\t * @param {module:engine/view/position~Position} position\n\t * @param {module:engine/view/attributeelement~AttributeElement} attribute\n\t * @returns {module:engine/view/position~Position} New position after wrapping.\n\t */\n\t_wrapPosition( position, attribute ) {\n\t\t// Return same position when trying to wrap with attribute similar to position parent.\n\t\tif ( attribute.isSimilar( position.parent ) ) {\n\t\t\treturn movePositionToTextNode( position.clone() );\n\t\t}\n\n\t\t// When position is inside text node - break it and place new position between two text nodes.\n\t\tif ( position.parent.is( '$text' ) ) {\n\t\t\tposition = breakTextNode( position );\n\t\t}\n\n\t\t// Create fake element that will represent position, and will not be merged with other attributes.\n\t\tconst fakePosition = this.createAttributeElement();\n\t\tfakePosition._priority = Number.POSITIVE_INFINITY;\n\t\tfakePosition.isSimilar = () => false;\n\n\t\t// Insert fake element in position location.\n\t\tposition.parent._insertChild( position.offset, fakePosition );\n\n\t\t// Range around inserted fake attribute element.\n\t\tconst wrapRange = new Range( position, position.getShiftedBy( 1 ) );\n\n\t\t// Wrap fake element with attribute (it will also merge if possible).\n\t\tthis.wrap( wrapRange, attribute );\n\n\t\t// Remove fake element and place new position there.\n\t\tconst newPosition = new Position( fakePosition.parent, fakePosition.index );\n\t\tfakePosition._remove();\n\n\t\t// If position is placed between text nodes - merge them and return position inside.\n\t\tconst nodeBefore = newPosition.nodeBefore;\n\t\tconst nodeAfter = newPosition.nodeAfter;\n\n\t\tif ( nodeBefore instanceof Text && nodeAfter instanceof Text ) {\n\t\t\treturn mergeTextNodes( nodeBefore, nodeAfter );\n\t\t}\n\n\t\t// If position is next to text node - move position inside.\n\t\treturn movePositionToTextNode( newPosition );\n\t}\n\n\t/**\n\t * \tWraps one {@link module:engine/view/attributeelement~AttributeElement AttributeElement} into another by\n\t * \tmerging them if possible. When merging is possible - all attributes, styles and classes are moved from wrapper\n\t * \telement to element being wrapped.\n\t *\n\t * \t@private\n\t * \t@param {module:engine/view/attributeelement~AttributeElement} wrapper Wrapper AttributeElement.\n\t * \t@param {module:engine/view/attributeelement~AttributeElement} toWrap AttributeElement to wrap using wrapper element.\n\t * \t@returns {Boolean} Returns `true` if elements are merged.\n\t */\n\t_wrapAttributeElement( wrapper, toWrap ) {\n\t\tif ( !canBeJoined( wrapper, toWrap ) ) {\n\t\t\treturn false;\n\t\t}\n\n\t\t// Can't merge if name or priority differs.\n\t\tif ( wrapper.name !== toWrap.name || wrapper.priority !== toWrap.priority ) {\n\t\t\treturn false;\n\t\t}\n\n\t\t// Check if attributes can be merged.\n\t\tfor ( const key of wrapper.getAttributeKeys() ) {\n\t\t\t// Classes and styles should be checked separately.\n\t\t\tif ( key === 'class' || key === 'style' ) {\n\t\t\t\tcontinue;\n\t\t\t}\n\n\t\t\t// If some attributes are different we cannot wrap.\n\t\t\tif ( toWrap.hasAttribute( key ) && toWrap.getAttribute( key ) !== wrapper.getAttribute( key ) ) {\n\t\t\t\treturn false;\n\t\t\t}\n\t\t}\n\n\t\t// Check if styles can be merged.\n\t\tfor ( const key of wrapper.getStyleNames() ) {\n\t\t\tif ( toWrap.hasStyle( key ) && toWrap.getStyle( key ) !== wrapper.getStyle( key ) ) {\n\t\t\t\treturn false;\n\t\t\t}\n\t\t}\n\n\t\t// Move all attributes/classes/styles from wrapper to wrapped AttributeElement.\n\t\tfor ( const key of wrapper.getAttributeKeys() ) {\n\t\t\t// Classes and styles should be checked separately.\n\t\t\tif ( key === 'class' || key === 'style' ) {\n\t\t\t\tcontinue;\n\t\t\t}\n\n\t\t\t// Move only these attributes that are not present - other are similar.\n\t\t\tif ( !toWrap.hasAttribute( key ) ) {\n\t\t\t\tthis.setAttribute( key, wrapper.getAttribute( key ), toWrap );\n\t\t\t}\n\t\t}\n\n\t\tfor ( const key of wrapper.getStyleNames() ) {\n\t\t\tif ( !toWrap.hasStyle( key ) ) {\n\t\t\t\tthis.setStyle( key, wrapper.getStyle( key ), toWrap );\n\t\t\t}\n\t\t}\n\n\t\tfor ( const key of wrapper.getClassNames() ) {\n\t\t\tif ( !toWrap.hasClass( key ) ) {\n\t\t\t\tthis.addClass( key, toWrap );\n\t\t\t}\n\t\t}\n\n\t\treturn true;\n\t}\n\n\t/**\n\t * Unwraps {@link module:engine/view/attributeelement~AttributeElement AttributeElement} from another by removing\n\t * corresponding attributes, classes and styles. All attributes, classes and styles from wrapper should be present\n\t * inside element being unwrapped.\n\t *\n\t * @private\n\t * @param {module:engine/view/attributeelement~AttributeElement} wrapper Wrapper AttributeElement.\n\t * @param {module:engine/view/attributeelement~AttributeElement} toUnwrap AttributeElement to unwrap using wrapper element.\n\t * @returns {Boolean} Returns `true` if elements are unwrapped.\n\t **/\n\t_unwrapAttributeElement( wrapper, toUnwrap ) {\n\t\tif ( !canBeJoined( wrapper, toUnwrap ) ) {\n\t\t\treturn false;\n\t\t}\n\n\t\t// Can't unwrap if name or priority differs.\n\t\tif ( wrapper.name !== toUnwrap.name || wrapper.priority !== toUnwrap.priority ) {\n\t\t\treturn false;\n\t\t}\n\n\t\t// Check if AttributeElement has all wrapper attributes.\n\t\tfor ( const key of wrapper.getAttributeKeys() ) {\n\t\t\t// Classes and styles should be checked separately.\n\t\t\tif ( key === 'class' || key === 'style' ) {\n\t\t\t\tcontinue;\n\t\t\t}\n\n\t\t\t// If some attributes are missing or different we cannot unwrap.\n\t\t\tif ( !toUnwrap.hasAttribute( key ) || toUnwrap.getAttribute( key ) !== wrapper.getAttribute( key ) ) {\n\t\t\t\treturn false;\n\t\t\t}\n\t\t}\n\n\t\t// Check if AttributeElement has all wrapper classes.\n\t\tif ( !toUnwrap.hasClass( ...wrapper.getClassNames() ) ) {\n\t\t\treturn false;\n\t\t}\n\n\t\t// Check if AttributeElement has all wrapper styles.\n\t\tfor ( const key of wrapper.getStyleNames() ) {\n\t\t\t// If some styles are missing or different we cannot unwrap.\n\t\t\tif ( !toUnwrap.hasStyle( key ) || toUnwrap.getStyle( key ) !== wrapper.getStyle( key ) ) {\n\t\t\t\treturn false;\n\t\t\t}\n\t\t}\n\n\t\t// Remove all wrapper's attributes from unwrapped element.\n\t\tfor ( const key of wrapper.getAttributeKeys() ) {\n\t\t\t// Classes and styles should be checked separately.\n\t\t\tif ( key === 'class' || key === 'style' ) {\n\t\t\t\tcontinue;\n\t\t\t}\n\n\t\t\tthis.removeAttribute( key, toUnwrap );\n\t\t}\n\n\t\t// Remove all wrapper's classes from unwrapped element.\n\t\tthis.removeClass( Array.from( wrapper.getClassNames() ), toUnwrap );\n\n\t\t// Remove all wrapper's styles from unwrapped element.\n\t\tthis.removeStyle( Array.from( wrapper.getStyleNames() ), toUnwrap );\n\n\t\treturn true;\n\t}\n\n\t/**\n\t * Helper function used by other `DowncastWriter` methods. Breaks attribute elements at the boundaries of given range.\n\t *\n\t * @private\n\t * @param {module:engine/view/range~Range} range Range which `start` and `end` positions will be used to break attributes.\n\t * @param {Boolean} [forceSplitText=false] If set to `true`, will break text nodes even if they are directly in container element.\n\t * This behavior will result in incorrect view state, but is needed by other view writing methods which then fixes view state.\n\t * @returns {module:engine/view/range~Range} New range with located at break positions.\n\t */\n\t_breakAttributesRange( range, forceSplitText = false ) {\n\t\tconst rangeStart = range.start;\n\t\tconst rangeEnd = range.end;\n\n\t\tvalidateRangeContainer( range, this.document );\n\n\t\t// Break at the collapsed position. Return new collapsed range.\n\t\tif ( range.isCollapsed ) {\n\t\t\tconst position = this._breakAttributes( range.start, forceSplitText );\n\n\t\t\treturn new Range( position, position );\n\t\t}\n\n\t\tconst breakEnd = this._breakAttributes( rangeEnd, forceSplitText );\n\t\tconst count = breakEnd.parent.childCount;\n\t\tconst breakStart = this._breakAttributes( rangeStart, forceSplitText );\n\n\t\t// Calculate new break end offset.\n\t\tbreakEnd.offset += breakEnd.parent.childCount - count;\n\n\t\treturn new Range( breakStart, breakEnd );\n\t}\n\n\t/**\n\t * Helper function used by other `DowncastWriter` methods. Breaks attribute elements at given position.\n\t *\n\t * Throws {@link module:utils/ckeditorerror~CKEditorError CKEditorError} `view-writer-cannot-break-empty-element` when break position\n\t * is placed inside {@link module:engine/view/emptyelement~EmptyElement EmptyElement}.\n\t *\n\t * Throws {@link module:utils/ckeditorerror~CKEditorError CKEditorError} `view-writer-cannot-break-ui-element` when break position\n\t * is placed inside {@link module:engine/view/uielement~UIElement UIElement}.\n\t *\n\t * @private\n\t * @param {module:engine/view/position~Position} position Position where to break attributes.\n\t * @param {Boolean} [forceSplitText=false] If set to `true`, will break text nodes even if they are directly in container element.\n\t * This behavior will result in incorrect view state, but is needed by other view writing methods which then fixes view state.\n\t * @returns {module:engine/view/position~Position} New position after breaking the attributes.\n\t */\n\t_breakAttributes( position, forceSplitText = false ) {\n\t\tconst positionOffset = position.offset;\n\t\tconst positionParent = position.parent;\n\n\t\t// If position is placed inside EmptyElement - throw an exception as we cannot break inside.\n\t\tif ( position.parent.is( 'emptyElement' ) ) {\n\t\t\t/**\n\t\t\t * Cannot break an `EmptyElement` instance.\n\t\t\t *\n\t\t\t * This error is thrown if\n\t\t\t * {@link module:engine/view/downcastwriter~DowncastWriter#breakAttributes `DowncastWriter#breakAttributes()`}\n\t\t\t * was executed in an incorrect position.\n\t\t\t *\n\t\t\t * @error view-writer-cannot-break-empty-element\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'view-writer-cannot-break-empty-element', this.document );\n\t\t}\n\n\t\t// If position is placed inside UIElement - throw an exception as we cannot break inside.\n\t\tif ( position.parent.is( 'uiElement' ) ) {\n\t\t\t/**\n\t\t\t * Cannot break a `UIElement` instance.\n\t\t\t *\n\t\t\t * This error is thrown if\n\t\t\t * {@link module:engine/view/downcastwriter~DowncastWriter#breakAttributes `DowncastWriter#breakAttributes()`}\n\t\t\t * was executed in an incorrect position.\n\t\t\t *\n\t\t\t * @error view-writer-cannot-break-ui-element\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'view-writer-cannot-break-ui-element', this.document );\n\t\t}\n\n\t\t// If position is placed inside RawElement - throw an exception as we cannot break inside.\n\t\tif ( position.parent.is( 'rawElement' ) ) {\n\t\t\t/**\n\t\t\t * Cannot break a `RawElement` instance.\n\t\t\t *\n\t\t\t * This error is thrown if\n\t\t\t * {@link module:engine/view/downcastwriter~DowncastWriter#breakAttributes `DowncastWriter#breakAttributes()`}\n\t\t\t * was executed in an incorrect position.\n\t\t\t *\n\t\t\t * @error view-writer-cannot-break-raw-element\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'view-writer-cannot-break-raw-element', this.document );\n\t\t}\n\n\t\t// There are no attributes to break and text nodes breaking is not forced.\n\t\tif ( !forceSplitText && positionParent.is( '$text' ) && isContainerOrFragment( positionParent.parent ) ) {\n\t\t\treturn position.clone();\n\t\t}\n\n\t\t// Position's parent is container, so no attributes to break.\n\t\tif ( isContainerOrFragment( positionParent ) ) {\n\t\t\treturn position.clone();\n\t\t}\n\n\t\t// Break text and start again in new position.\n\t\tif ( positionParent.is( '$text' ) ) {\n\t\t\treturn this._breakAttributes( breakTextNode( position ), forceSplitText );\n\t\t}\n\n\t\tconst length = positionParent.childCount;\n\n\t\t// <p>foo<b><u>bar{}</u></b></p>\n\t\t// <p>foo<b><u>bar</u>[]</b></p>\n\t\t// <p>foo<b><u>bar</u></b>[]</p>\n\t\tif ( positionOffset == length ) {\n\t\t\tconst newPosition = new Position( positionParent.parent, positionParent.index + 1 );\n\n\t\t\treturn this._breakAttributes( newPosition, forceSplitText );\n\t\t} else {\n\t\t\t// <p>foo<b><u>{}bar</u></b></p>\n\t\t\t// <p>foo<b>[]<u>bar</u></b></p>\n\t\t\t// <p>foo{}<b><u>bar</u></b></p>\n\t\t\tif ( positionOffset === 0 ) {\n\t\t\t\tconst newPosition = new Position( positionParent.parent, positionParent.index );\n\n\t\t\t\treturn this._breakAttributes( newPosition, forceSplitText );\n\t\t\t}\n\t\t\t// <p>foo<b><u>b{}ar</u></b></p>\n\t\t\t// <p>foo<b><u>b[]ar</u></b></p>\n\t\t\t// <p>foo<b><u>b</u>[]<u>ar</u></b></p>\n\t\t\t// <p>foo<b><u>b</u></b>[]<b><u>ar</u></b></p>\n\t\t\telse {\n\t\t\t\tconst offsetAfter = positionParent.index + 1;\n\n\t\t\t\t// Break element.\n\t\t\t\tconst clonedNode = positionParent._clone();\n\n\t\t\t\t// Insert cloned node to position's parent node.\n\t\t\t\tpositionParent.parent._insertChild( offsetAfter, clonedNode );\n\t\t\t\tthis._addToClonedElementsGroup( clonedNode );\n\n\t\t\t\t// Get nodes to move.\n\t\t\t\tconst count = positionParent.childCount - positionOffset;\n\t\t\t\tconst nodesToMove = positionParent._removeChildren( positionOffset, count );\n\n\t\t\t\t// Move nodes to cloned node.\n\t\t\t\tclonedNode._appendChild( nodesToMove );\n\n\t\t\t\t// Create new position to work on.\n\t\t\t\tconst newPosition = new Position( positionParent.parent, offsetAfter );\n\n\t\t\t\treturn this._breakAttributes( newPosition, forceSplitText );\n\t\t\t}\n\t\t}\n\t}\n\n\t/**\n\t * Stores the information that an {@link module:engine/view/attributeelement~AttributeElement attribute element} was\n\t * added to the tree. Saves the reference to the group in the given element and updates the group, so other elements\n\t * from the group now keep a reference to the given attribute element.\n\t *\n\t * The clones group can be obtained using {@link module:engine/view/attributeelement~AttributeElement#getElementsWithSameId}.\n\t *\n\t * Does nothing if added element has no {@link module:engine/view/attributeelement~AttributeElement#id id}.\n\t *\n\t * @private\n\t * @param {module:engine/view/attributeelement~AttributeElement} element Attribute element to save.\n\t */\n\t_addToClonedElementsGroup( element ) {\n\t\t// Add only if the element is in document tree.\n\t\tif ( !element.root.is( 'rootElement' ) ) {\n\t\t\treturn;\n\t\t}\n\n\t\t// Traverse the element's children recursively to find other attribute elements that also might got inserted.\n\t\t// The loop is at the beginning so we can make fast returns later in the code.\n\t\tif ( element.is( 'element' ) ) {\n\t\t\tfor ( const child of element.getChildren() ) {\n\t\t\t\tthis._addToClonedElementsGroup( child );\n\t\t\t}\n\t\t}\n\n\t\tconst id = element.id;\n\n\t\tif ( !id ) {\n\t\t\treturn;\n\t\t}\n\n\t\tlet group = this._cloneGroups.get( id );\n\n\t\tif ( !group ) {\n\t\t\tgroup = new Set();\n\t\t\tthis._cloneGroups.set( id, group );\n\t\t}\n\n\t\tgroup.add( element );\n\t\telement._clonesGroup = group;\n\t}\n\n\t/**\n\t * Removes all the information about the given {@link module:engine/view/attributeelement~AttributeElement attribute element}\n\t * from its clones group.\n\t *\n\t * Keep in mind, that the element will still keep a reference to the group (but the group will not keep a reference to it).\n\t * This allows to reference the whole group even if the element was already removed from the tree.\n\t *\n\t * Does nothing if the element has no {@link module:engine/view/attributeelement~AttributeElement#id id}.\n\t *\n\t * @private\n\t * @param {module:engine/view/attributeelement~AttributeElement} element Attribute element to remove.\n\t */\n\t_removeFromClonedElementsGroup( element ) {\n\t\t// Traverse the element's children recursively to find other attribute elements that also got removed.\n\t\t// The loop is at the beginning so we can make fast returns later in the code.\n\t\tif ( element.is( 'element' ) ) {\n\t\t\tfor ( const child of element.getChildren() ) {\n\t\t\t\tthis._removeFromClonedElementsGroup( child );\n\t\t\t}\n\t\t}\n\n\t\tconst id = element.id;\n\n\t\tif ( !id ) {\n\t\t\treturn;\n\t\t}\n\n\t\tconst group = this._cloneGroups.get( id );\n\n\t\tif ( !group ) {\n\t\t\treturn;\n\t\t}\n\n\t\tgroup.delete( element );\n\t\t// Not removing group from element on purpose!\n\t\t// If other parts of code have reference to this element, they will be able to get references to other elements from the group.\n\t}\n}\n\n// Helper function for `view.writer.wrap`. Checks if given element has any children that are not ui elements.\nfunction _hasNonUiChildren( parent ) {\n\treturn Array.from( parent.getChildren() ).some( child => !child.is( 'uiElement' ) );\n}\n\n/**\n * The `attribute` passed to {@link module:engine/view/downcastwriter~DowncastWriter#wrap `DowncastWriter#wrap()`}\n * must be an instance of {@link module:engine/view/attributeelement~AttributeElement `AttributeElement`}.\n *\n * @error view-writer-wrap-invalid-attribute\n */\n\n// Returns first parent container of specified {@link module:engine/view/position~Position Position}.\n// Position's parent node is checked as first, then next parents are checked.\n// Note that {@link module:engine/view/documentfragment~DocumentFragment DocumentFragment} is treated like a container.\n//\n// @param {module:engine/view/position~Position} position Position used as a start point to locate parent container.\n// @returns {module:engine/view/containerelement~ContainerElement|module:engine/view/documentfragment~DocumentFragment|undefined}\n// Parent container element or `undefined` if container is not found.\nfunction getParentContainer( position ) {\n\tlet parent = position.parent;\n\n\twhile ( !isContainerOrFragment( parent ) ) {\n\t\tif ( !parent ) {\n\t\t\treturn undefined;\n\t\t}\n\t\tparent = parent.parent;\n\t}\n\n\treturn parent;\n}\n\n// Checks if first {@link module:engine/view/attributeelement~AttributeElement AttributeElement} provided to the function\n// can be wrapped otuside second element. It is done by comparing elements'\n// {@link module:engine/view/attributeelement~AttributeElement#priority priorities}, if both have same priority\n// {@link module:engine/view/element~Element#getIdentity identities} are compared.\n//\n// @param {module:engine/view/attributeelement~AttributeElement} a\n// @param {module:engine/view/attributeelement~AttributeElement} b\n// @returns {Boolean}\nfunction shouldABeOutsideB( a, b ) {\n\tif ( a.priority < b.priority ) {\n\t\treturn true;\n\t} else if ( a.priority > b.priority ) {\n\t\treturn false;\n\t}\n\n\t// When priorities are equal and names are different - use identities.\n\treturn a.getIdentity() < b.getIdentity();\n}\n\n// Returns new position that is moved to near text node. Returns same position if there is no text node before of after\n// specified position.\n//\n//\t\t<p>foo[]</p>  ->  <p>foo{}</p>\n//\t\t<p>[]foo</p>  ->  <p>{}foo</p>\n//\n// @param {module:engine/view/position~Position} position\n// @returns {module:engine/view/position~Position} Position located inside text node or same position if there is no text nodes\n// before or after position location.\nfunction movePositionToTextNode( position ) {\n\tconst nodeBefore = position.nodeBefore;\n\n\tif ( nodeBefore && nodeBefore.is( '$text' ) ) {\n\t\treturn new Position( nodeBefore, nodeBefore.data.length );\n\t}\n\n\tconst nodeAfter = position.nodeAfter;\n\n\tif ( nodeAfter && nodeAfter.is( '$text' ) ) {\n\t\treturn new Position( nodeAfter, 0 );\n\t}\n\n\treturn position;\n}\n\n// Breaks text node into two text nodes when possible.\n//\n//\t\t<p>foo{}bar</p> -> <p>foo[]bar</p>\n//\t\t<p>{}foobar</p> -> <p>[]foobar</p>\n//\t\t<p>foobar{}</p> -> <p>foobar[]</p>\n//\n// @param {module:engine/view/position~Position} position Position that need to be placed inside text node.\n// @returns {module:engine/view/position~Position} New position after breaking text node.\nfunction breakTextNode( position ) {\n\tif ( position.offset == position.parent.data.length ) {\n\t\treturn new Position( position.parent.parent, position.parent.index + 1 );\n\t}\n\n\tif ( position.offset === 0 ) {\n\t\treturn new Position( position.parent.parent, position.parent.index );\n\t}\n\n\t// Get part of the text that need to be moved.\n\tconst textToMove = position.parent.data.slice( position.offset );\n\n\t// Leave rest of the text in position's parent.\n\tposition.parent._data = position.parent.data.slice( 0, position.offset );\n\n\t// Insert new text node after position's parent text node.\n\tposition.parent.parent._insertChild( position.parent.index + 1, new Text( position.root.document, textToMove ) );\n\n\t// Return new position between two newly created text nodes.\n\treturn new Position( position.parent.parent, position.parent.index + 1 );\n}\n\n// Merges two text nodes into first node. Removes second node and returns merge position.\n//\n// @param {module:engine/view/text~Text} t1 First text node to merge. Data from second text node will be moved at the end of\n// this text node.\n// @param {module:engine/view/text~Text} t2 Second text node to merge. This node will be removed after merging.\n// @returns {module:engine/view/position~Position} Position after merging text nodes.\nfunction mergeTextNodes( t1, t2 ) {\n\t// Merge text data into first text node and remove second one.\n\tconst nodeBeforeLength = t1.data.length;\n\tt1._data += t2.data;\n\tt2._remove();\n\n\treturn new Position( t1, nodeBeforeLength );\n}\n\n// Checks if provided nodes are valid to insert.\n//\n// Throws {@link module:utils/ckeditorerror~CKEditorError CKEditorError} `view-writer-insert-invalid-node` when nodes to insert\n// contains instances that are not supported ones (see error description for valid ones.\n//\n// @param Iterable.<module:engine/view/text~Text|module:engine/view/element~Element> nodes\n// @param {Object} errorContext\nfunction validateNodesToInsert( nodes, errorContext ) {\n\tfor ( const node of nodes ) {\n\t\tif ( !validNodesToInsert.some( ( validNode => node instanceof validNode ) ) ) { // eslint-disable-line no-use-before-define\n\t\t\t/**\n\t\t\t * One of the nodes to be inserted is of an invalid type.\n\t\t\t *\n\t\t\t * Nodes to be inserted with {@link module:engine/view/downcastwriter~DowncastWriter#insert `DowncastWriter#insert()`} should be\n\t\t\t * of the following types:\n\t\t\t *\n\t\t\t * * {@link module:engine/view/attributeelement~AttributeElement AttributeElement},\n\t\t\t * * {@link module:engine/view/containerelement~ContainerElement ContainerElement},\n\t\t\t * * {@link module:engine/view/emptyelement~EmptyElement EmptyElement},\n\t\t\t * * {@link module:engine/view/uielement~UIElement UIElement},\n\t\t\t * * {@link module:engine/view/rawelement~RawElement RawElement},\n\t\t\t * * {@link module:engine/view/text~Text Text}.\n\t\t\t *\n\t\t\t * @error view-writer-insert-invalid-node-type\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'view-writer-insert-invalid-node-type', errorContext );\n\t\t}\n\n\t\tif ( !node.is( '$text' ) ) {\n\t\t\tvalidateNodesToInsert( node.getChildren(), errorContext );\n\t\t}\n\t}\n}\n\nconst validNodesToInsert = [ Text, AttributeElement, ContainerElement, EmptyElement, RawElement, UIElement ];\n\n// Checks if node is ContainerElement or DocumentFragment, because in most cases they should be treated the same way.\n//\n// @param {module:engine/view/node~Node} node\n// @returns {Boolean} Returns `true` if node is instance of ContainerElement or DocumentFragment.\nfunction isContainerOrFragment( node ) {\n\treturn node && ( node.is( 'containerElement' ) || node.is( 'documentFragment' ) );\n}\n\n// Checks if {@link module:engine/view/range~Range#start range start} and {@link module:engine/view/range~Range#end range end} are placed\n// inside same {@link module:engine/view/containerelement~ContainerElement container element}.\n// Throws {@link module:utils/ckeditorerror~CKEditorError CKEditorError} `view-writer-invalid-range-container` when validation fails.\n//\n// @param {module:engine/view/range~Range} range\n// @param {Object} errorContext\nfunction validateRangeContainer( range, errorContext ) {\n\tconst startContainer = getParentContainer( range.start );\n\tconst endContainer = getParentContainer( range.end );\n\n\tif ( !startContainer || !endContainer || startContainer !== endContainer ) {\n\t\t/**\n\t\t * The container of the given range is invalid.\n\t\t *\n\t\t * This may happen if {@link module:engine/view/range~Range#start range start} and\n\t\t * {@link module:engine/view/range~Range#end range end} positions are not placed inside the same container element or\n\t\t * a parent container for these positions cannot be found.\n\t\t *\n\t\t * Methods like {@link module:engine/view/downcastwriter~DowncastWriter#wrap `DowncastWriter#remove()`},\n\t\t * {@link module:engine/view/downcastwriter~DowncastWriter#wrap `DowncastWriter#clean()`},\n\t\t * {@link module:engine/view/downcastwriter~DowncastWriter#wrap `DowncastWriter#wrap()`},\n\t\t * {@link module:engine/view/downcastwriter~DowncastWriter#wrap `DowncastWriter#unwrap()`} need to be called\n\t\t * on a range that has its start and end positions located in the same container element. Both positions can be\n\t\t * nested within other elements (e.g. an attribute element) but the closest container ancestor must be the same.\n\t\t *\n\t\t * @error view-writer-invalid-range-container\n\t\t */\n\t\tthrow new CKEditorError( 'view-writer-invalid-range-container', errorContext );\n\t}\n}\n\n// Checks if two attribute elements can be joined together. Elements can be joined together if, and only if\n// they do not have ids specified.\n//\n// @private\n// @param {module:engine/view/element~Element} a\n// @param {module:engine/view/element~Element} b\n// @returns {Boolean}\nfunction canBeJoined( a, b ) {\n\treturn a.id === null && b.id === null;\n}\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module utils/dom/istext\n */\n\n/**\n * Checks if the object is a native DOM Text node.\n *\n * @param {*} obj\n * @returns {Boolean}\n */\nexport default function isText( obj ) {\n\treturn Object.prototype.toString.call( obj ) == '[object Text]';\n}\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\nimport { keyCodes } from '@ckeditor/ckeditor5-utils/src/keyboard';\nimport isText from '@ckeditor/ckeditor5-utils/src/dom/istext';\n\n/**\n * Set of utils related to block and inline fillers handling.\n *\n * Browsers do not allow to put caret in elements which does not have height. Because of it, we need to fill all\n * empty elements which should be selectable with elements or characters called \"fillers\". Unfortunately there is no one\n * universal filler, this is why two types are uses:\n *\n * * Block filler is an element which fill block elements, like `<p>`. CKEditor uses `<br>` as a block filler during the editing,\n * as browsers do natively. So instead of an empty `<p>` there will be `<p><br></p>`. The advantage of block filler is that\n * it is transparent for the selection, so when the caret is before the `<br>` and user presses right arrow he will be\n * moved to the next paragraph, not after the `<br>`. The disadvantage is that it breaks a block, so it can not be used\n * in the middle of a line of text. The {@link module:engine/view/filler~BR_FILLER `<br>` filler} can be replaced with any other\n * character in the data output, for instance {@link module:engine/view/filler~NBSP_FILLER non-breaking space}.\n *\n * * Inline filler is a filler which does not break a line of text, so it can be used inside the text, for instance in the empty\n * `<b>` surrendered by text: `foo<b></b>bar`, if we want to put the caret there. CKEditor uses a sequence of the zero-width\n * spaces as an {@link module:engine/view/filler~INLINE_FILLER inline filler} having the predetermined\n * {@link module:engine/view/filler~INLINE_FILLER_LENGTH length}. A sequence is used, instead of a single character to\n * avoid treating random zero-width spaces as the inline filler. Disadvantage of the inline filler is that it is not\n * transparent for the selection. The arrow key moves the caret between zero-width spaces characters, so the additional\n * code is needed to handle the caret.\n *\n * Both inline and block fillers are handled by the {@link module:engine/view/renderer~Renderer renderer} and are not present in the\n * view.\n *\n * @module engine/view/filler\n */\n\n/**\n * Non-breaking space filler creator. This is a function which creates `&nbsp;` text node.\n * It defines how the filler is created.\n *\n * @see module:engine/view/filler~BR_FILLER\n * @function\n */\nexport const NBSP_FILLER = domDocument => domDocument.createTextNode( '\\u00A0' );\n\n/**\n * `<br>` filler creator. This is a function which creates `<br data-cke-filler=\"true\">` element.\n * It defines how the filler is created.\n *\n * @see module:engine/view/filler~NBSP_FILLER\n * @function\n */\nexport const BR_FILLER = domDocument => {\n\tconst fillerBr = domDocument.createElement( 'br' );\n\tfillerBr.dataset.ckeFiller = true;\n\n\treturn fillerBr;\n};\n\n/**\n * Length of the {@link module:engine/view/filler~INLINE_FILLER INLINE_FILLER}.\n */\nexport const INLINE_FILLER_LENGTH = 7;\n\n/**\n * Inline filler which is a sequence of the zero width spaces.\n *\n * @type {String}\n */\nexport const INLINE_FILLER = ( () => {\n\tlet inlineFiller = '';\n\n\tfor ( let i = 0; i < INLINE_FILLER_LENGTH; i++ ) {\n\t\tinlineFiller += '\\u200b';\n\t}\n\n\treturn inlineFiller;\n} )(); // Usu IIF so the INLINE_FILLER appears as a constant in the docs.\n\n/**\n * Checks if the node is a text node which starts with the {@link module:engine/view/filler~INLINE_FILLER inline filler}.\n *\n *\t\tstartsWithFiller( document.createTextNode( INLINE_FILLER ) ); // true\n *\t\tstartsWithFiller( document.createTextNode( INLINE_FILLER + 'foo' ) ); // true\n *\t\tstartsWithFiller( document.createTextNode( 'foo' ) ); // false\n *\t\tstartsWithFiller( document.createElement( 'p' ) ); // false\n *\n * @param {Node} domNode DOM node.\n * @returns {Boolean} True if the text node starts with the {@link module:engine/view/filler~INLINE_FILLER inline filler}.\n */\nexport function startsWithFiller( domNode ) {\n\treturn isText( domNode ) && ( domNode.data.substr( 0, INLINE_FILLER_LENGTH ) === INLINE_FILLER );\n}\n\n/**\n * Checks if the text node contains only the {@link module:engine/view/filler~INLINE_FILLER inline filler}.\n *\n *\t\tisInlineFiller( document.createTextNode( INLINE_FILLER ) ); // true\n *\t\tisInlineFiller( document.createTextNode( INLINE_FILLER + 'foo' ) ); // false\n *\n * @param {Text} domText DOM text node.\n * @returns {Boolean} True if the text node contains only the {@link module:engine/view/filler~INLINE_FILLER inline filler}.\n */\nexport function isInlineFiller( domText ) {\n\treturn domText.data.length == INLINE_FILLER_LENGTH && startsWithFiller( domText );\n}\n\n/**\n * Get string data from the text node, removing an {@link module:engine/view/filler~INLINE_FILLER inline filler} from it,\n * if text node contains it.\n *\n *\t\tgetDataWithoutFiller( document.createTextNode( INLINE_FILLER + 'foo' ) ) == 'foo' // true\n *\t\tgetDataWithoutFiller( document.createTextNode( 'foo' ) ) == 'foo' // true\n *\n * @param {Text} domText DOM text node, possible with inline filler.\n * @returns {String} Data without filler.\n */\nexport function getDataWithoutFiller( domText ) {\n\tif ( startsWithFiller( domText ) ) {\n\t\treturn domText.data.slice( INLINE_FILLER_LENGTH );\n\t} else {\n\t\treturn domText.data;\n\t}\n}\n\n/**\n * Assign key observer which move cursor from the end of the inline filler to the beginning of it when\n * the left arrow is pressed, so the filler does not break navigation.\n *\n * @param {module:engine/view/view~View} view View controller instance we should inject quirks handling on.\n */\nexport function injectQuirksHandling( view ) {\n\tview.document.on( 'keydown', jumpOverInlineFiller );\n}\n\n// Move cursor from the end of the inline filler to the beginning of it when, so the filler does not break navigation.\nfunction jumpOverInlineFiller( evt, data ) {\n\tif ( data.keyCode == keyCodes.arrowleft ) {\n\t\tconst domSelection = data.domTarget.ownerDocument.defaultView.getSelection();\n\n\t\tif ( domSelection.rangeCount == 1 && domSelection.getRangeAt( 0 ).collapsed ) {\n\t\t\tconst domParent = domSelection.getRangeAt( 0 ).startContainer;\n\t\t\tconst domOffset = domSelection.getRangeAt( 0 ).startOffset;\n\n\t\t\tif ( startsWithFiller( domParent ) && domOffset <= INLINE_FILLER_LENGTH ) {\n\t\t\t\tdomSelection.collapse( domParent, 0 );\n\t\t\t}\n\t\t}\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module utils/fastdiff\n */\n\n/**\n * Finds positions of the first and last change in the given string/array and generates a set of changes:\n *\n *\t\tfastDiff( '12a', '12xyza' );\n *\t\t// [ { index: 2, type: 'insert', values: [ 'x', 'y', 'z' ] } ]\n *\n *\t\tfastDiff( '12a', '12aa' );\n *\t\t// [ { index: 3, type: 'insert', values: [ 'a' ] } ]\n *\n *\t\tfastDiff( '12xyza', '12a' );\n *\t\t// [ { index: 2, type: 'delete', howMany: 3 } ]\n *\n *\t\tfastDiff( [ '1', '2', 'a', 'a' ], [ '1', '2', 'a' ] );\n *\t\t// [ { index: 3, type: 'delete', howMany: 1 } ]\n *\n *\t\tfastDiff( [ '1', '2', 'a', 'b', 'c', '3' ], [ '2', 'a', 'b' ] );\n *\t\t// [ { index: 0, type: 'insert', values: [ '2', 'a', 'b' ] }, { index: 3, type: 'delete', howMany: 6 } ]\n *\n * Passed arrays can contain any type of data, however to compare them correctly custom comparator function\n * should be passed as a third parameter:\n *\n *\t\tfastDiff( [ { value: 1 }, { value: 2 } ], [ { value: 1 }, { value: 3 } ], ( a, b ) => {\n *\t\t\treturn a.value === b.value;\n *\t\t} );\n *\t\t// [ { index: 1, type: 'insert', values: [ { value: 3 } ] }, { index: 2, type: 'delete', howMany: 1 } ]\n *\n * The resulted set of changes can be applied to the input in order to transform it into the output, for example:\n *\n *\t\tlet input = '12abc3';\n *\t\tconst output = '2ab';\n *\t\tconst changes = fastDiff( input, output );\n *\n *\t\tchanges.forEach( change => {\n *\t\t\tif ( change.type == 'insert' ) {\n *\t\t\t\tinput = input.substring( 0, change.index ) + change.values.join( '' ) + input.substring( change.index );\n *\t\t\t} else if ( change.type == 'delete' ) {\n *\t\t\t\tinput = input.substring( 0, change.index ) + input.substring( change.index + change.howMany );\n *\t\t\t}\n *\t\t} );\n *\n *\t\t// input equals output now\n *\n * or in case of arrays:\n *\n *\t\tlet input = [ '1', '2', 'a', 'b', 'c', '3' ];\n *\t\tconst output = [ '2', 'a', 'b' ];\n *\t\tconst changes = fastDiff( input, output );\n *\n *\t\tchanges.forEach( change => {\n *\t\t\tif ( change.type == 'insert' ) {\n *\t\t\t\tinput = input.slice( 0, change.index ).concat( change.values, input.slice( change.index ) );\n *\t\t\t} else if ( change.type == 'delete' ) {\n *\t\t\t\tinput = input.slice( 0, change.index ).concat( input.slice( change.index + change.howMany ) );\n *\t\t\t}\n *\t\t} );\n *\n *\t\t// input equals output now\n *\n * By passing `true` as the fourth parameter (`atomicChanges`) the output of this function will become compatible with\n * the {@link module:utils/diff~diff `diff()`} function:\n *\n *\t\tfastDiff( '12a', '12xyza' );\n *\t\t// [ 'equal', 'equal', 'insert', 'insert', 'insert', 'equal' ]\n *\n * The default output format of this function is compatible with the output format of\n * {@link module:utils/difftochanges~diffToChanges `diffToChanges()`}. The `diffToChanges()` input format is, in turn,\n * compatible with the output of {@link module:utils/diff~diff `diff()`}:\n *\n *\t\tconst a = '1234';\n *\t\tconst b = '12xyz34';\n *\n *\t\t// Both calls will return the same results (grouped changes format).\n *\t\tfastDiff( a, b );\n *\t\tdiffToChanges( diff( a, b ) );\n *\n *\t\t// Again, both calls will return the same results (atomic changes format).\n *\t\tfastDiff( a, b, null, true );\n *\t\tdiff( a, b );\n *\n *\n * @param {Array|String} a Input array or string.\n * @param {Array|String} b Input array or string.\n * @param {Function} [cmp] Optional function used to compare array values, by default `===` (strict equal operator) is used.\n * @param {Boolean} [atomicChanges=false] Whether an array of `inset|delete|equal` operations should\n * be returned instead of changes set. This makes this function compatible with {@link module:utils/diff~diff `diff()`}.\n * @returns {Array} Array of changes.\n */\nexport default function fastDiff( a, b, cmp, atomicChanges = false ) {\n\t// Set the comparator function.\n\tcmp = cmp || function( a, b ) {\n\t\treturn a === b;\n\t};\n\n\t// Convert the string (or any array-like object - eg. NodeList) to an array by using the slice() method because,\n\t// unlike Array.from(), it returns array of UTF-16 code units instead of the code points of a string.\n\t// One code point might be a surrogate pair of two code units. All text offsets are expected to be in code units.\n\t// See ckeditor/ckeditor5#3147.\n\t//\n\t// We need to make sure here that fastDiff() works identical to diff().\n\tif ( !Array.isArray( a ) ) {\n\t\ta = Array.prototype.slice.call( a );\n\t}\n\n\tif ( !Array.isArray( b ) ) {\n\t\tb = Array.prototype.slice.call( b );\n\t}\n\n\t// Find first and last change.\n\tconst changeIndexes = findChangeBoundaryIndexes( a, b, cmp );\n\n\t// Transform into changes array.\n\treturn atomicChanges ? changeIndexesToAtomicChanges( changeIndexes, b.length ) : changeIndexesToChanges( b, changeIndexes );\n}\n\n// Finds position of the first and last change in the given arrays. For example:\n//\n//\t\tconst indexes = findChangeBoundaryIndexes( [ '1', '2', '3', '4' ], [ '1', '3', '4', '2', '4' ] );\n//\t\tconsole.log( indexes ); // { firstIndex: 1, lastIndexOld: 3, lastIndexNew: 4 }\n//\n// The above indexes means that in the first array the modified part is `1[23]4` and in the second array it is `1[342]4`.\n// Based on such indexes, array with `insert`/`delete` operations which allows transforming first value into the second one\n// can be generated.\n//\n// @param {Array} arr1\n// @param {Array} arr2\n// @param {Function} cmp Comparator function.\n// @returns {Object}\n// @returns {Number} return.firstIndex Index of the first change in both values (always the same for both).\n// @returns {Number} result.lastIndexOld Index of the last common value in `arr1`.\n// @returns {Number} result.lastIndexNew Index of the last common value in `arr2`.\nfunction findChangeBoundaryIndexes( arr1, arr2, cmp ) {\n\t// Find the first difference between passed values.\n\tconst firstIndex = findFirstDifferenceIndex( arr1, arr2, cmp );\n\n\t// If arrays are equal return -1 indexes object.\n\tif ( firstIndex === -1 ) {\n\t\treturn { firstIndex: -1, lastIndexOld: -1, lastIndexNew: -1 };\n\t}\n\n\t// Remove the common part of each value and reverse them to make it simpler to find the last difference between them.\n\tconst oldArrayReversed = cutAndReverse( arr1, firstIndex );\n\tconst newArrayReversed = cutAndReverse( arr2, firstIndex );\n\n\t// Find the first difference between reversed values.\n\t// It should be treated as \"how many elements from the end the last difference occurred\".\n\t//\n\t// For example:\n\t//\n\t// \t\t\t\tinitial\t->\tafter cut\t-> reversed:\n\t// oldValue:\t'321ba'\t->\t'21ba'\t\t-> 'ab12'\n\t// newValue:\t'31xba'\t->\t'1xba'\t\t-> 'abx1'\n\t// lastIndex:\t\t\t\t\t\t\t-> 2\n\t//\n\t// So the last change occurred two characters from the end of the arrays.\n\tconst lastIndex = findFirstDifferenceIndex( oldArrayReversed, newArrayReversed, cmp );\n\n\t// Use `lastIndex` to calculate proper offset, starting from the beginning (`lastIndex` kind of starts from the end).\n\tconst lastIndexOld = arr1.length - lastIndex;\n\tconst lastIndexNew = arr2.length - lastIndex;\n\n\treturn { firstIndex, lastIndexOld, lastIndexNew };\n}\n\n// Returns a first index on which given arrays differ. If both arrays are the same, -1 is returned.\n//\n// @param {Array} arr1\n// @param {Array} arr2\n// @param {Function} cmp Comparator function.\n// @returns {Number}\nfunction findFirstDifferenceIndex( arr1, arr2, cmp ) {\n\tfor ( let i = 0; i < Math.max( arr1.length, arr2.length ); i++ ) {\n\t\tif ( arr1[ i ] === undefined || arr2[ i ] === undefined || !cmp( arr1[ i ], arr2[ i ] ) ) {\n\t\t\treturn i;\n\t\t}\n\t}\n\n\treturn -1; // Return -1 if arrays are equal.\n}\n\n// Returns a copy of the given array with `howMany` elements removed starting from the beginning and in reversed order.\n//\n// @param {Array} arr Array to be processed.\n// @param {Number} howMany How many elements from array beginning to remove.\n// @returns {Array} Shortened and reversed array.\nfunction cutAndReverse( arr, howMany ) {\n\treturn arr.slice( howMany ).reverse();\n}\n\n// Generates changes array based on change indexes from `findChangeBoundaryIndexes` function. This function will\n// generate array with 0 (no changes), 1 (deletion or insertion) or 2 records (insertion and deletion).\n//\n// @param {Array} newArray New array for which change indexes were calculated.\n// @param {Object} changeIndexes Change indexes object from `findChangeBoundaryIndexes` function.\n// @returns {Array.<Object>} Array of changes compatible with {@link module:utils/difftochanges~diffToChanges} format.\nfunction changeIndexesToChanges( newArray, changeIndexes ) {\n\tconst result = [];\n\tconst { firstIndex, lastIndexOld, lastIndexNew } = changeIndexes;\n\n\t// Order operations as 'insert', 'delete' array to keep compatibility with {@link module:utils/difftochanges~diffToChanges}\n\t// in most cases. However, 'diffToChanges' does not stick to any order so in some cases\n\t// (for example replacing '12345' with 'abcd') it will generate 'delete', 'insert' order.\n\tif ( lastIndexNew - firstIndex > 0 ) {\n\t\tresult.push( {\n\t\t\tindex: firstIndex,\n\t\t\ttype: 'insert',\n\t\t\tvalues: newArray.slice( firstIndex, lastIndexNew )\n\t\t} );\n\t}\n\n\tif ( lastIndexOld - firstIndex > 0 ) {\n\t\tresult.push( {\n\t\t\tindex: firstIndex + ( lastIndexNew - firstIndex ), // Increase index of what was inserted.\n\t\t\ttype: 'delete',\n\t\t\thowMany: lastIndexOld - firstIndex\n\t\t} );\n\t}\n\n\treturn result;\n}\n\n// Generates array with set `equal|insert|delete` operations based on change indexes from `findChangeBoundaryIndexes` function.\n//\n// @param {Object} changeIndexes Change indexes object from `findChangeBoundaryIndexes` function.\n// @param {Number} newLength Length of the new array on which `findChangeBoundaryIndexes` calculated change indexes.\n// @returns {Array.<String>} Array of changes compatible with {@link module:utils/diff~diff} format.\nfunction changeIndexesToAtomicChanges( changeIndexes, newLength ) {\n\tconst { firstIndex, lastIndexOld, lastIndexNew } = changeIndexes;\n\n\t// No changes.\n\tif ( firstIndex === -1 ) {\n\t\treturn Array( newLength ).fill( 'equal' );\n\t}\n\n\tlet result = [];\n\tif ( firstIndex > 0 ) {\n\t\tresult = result.concat( Array( firstIndex ).fill( 'equal' ) );\n\t}\n\n\tif ( lastIndexNew - firstIndex > 0 ) {\n\t\tresult = result.concat( Array( lastIndexNew - firstIndex ).fill( 'insert' ) );\n\t}\n\n\tif ( lastIndexOld - firstIndex > 0 ) {\n\t\tresult = result.concat( Array( lastIndexOld - firstIndex ).fill( 'delete' ) );\n\t}\n\n\tif ( lastIndexNew < newLength ) {\n\t\tresult = result.concat( Array( newLength - lastIndexNew ).fill( 'equal' ) );\n\t}\n\n\treturn result;\n}\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module utils/diff\n */\n\nimport fastDiff from '../src/fastdiff';\n\n// The following code is based on the \"O(NP) Sequence Comparison Algorithm\"\n// by Sun Wu, Udi Manber, Gene Myers, Webb Miller.\n\n/**\n * Calculates the difference between two arrays or strings producing an array containing a list of changes\n * necessary to transform input into output.\n *\n *\t\tdiff( 'aba', 'acca' ); // [ 'equal', 'insert', 'insert', 'delete', 'equal' ]\n *\n * This function is based on the \"O(NP) Sequence Comparison Algorithm\" by Sun Wu, Udi Manber, Gene Myers, Webb Miller.\n * Unfortunately, while it gives the most precise results, its to complex for longer strings/arrow (above 200 items).\n * Therefore, `diff()` automatically switches to {@link module:utils/fastdiff~fastDiff `fastDiff()`} when detecting\n * such a scenario. The return formats of both functions are identical.\n *\n * @param {Array|String} a Input array or string.\n * @param {Array|String} b Output array or string.\n * @param {Function} [cmp] Optional function used to compare array values, by default === is used.\n * @returns {Array} Array of changes.\n */\nexport default function diff( a, b, cmp ) {\n\t// Set the comparator function.\n\tcmp = cmp || function( a, b ) {\n\t\treturn a === b;\n\t};\n\n\tconst aLength = a.length;\n\tconst bLength = b.length;\n\n\t// Perform `fastDiff` for longer strings/arrays (see #269).\n\tif ( aLength > 200 || bLength > 200 || aLength + bLength > 300 ) {\n\t\treturn diff.fastDiff( a, b, cmp, true );\n\t}\n\n\t// Temporary action type statics.\n\tlet _insert, _delete;\n\n\t// Swapped the arrays to use the shorter one as the first one.\n\tif ( bLength < aLength ) {\n\t\tconst tmp = a;\n\n\t\ta = b;\n\t\tb = tmp;\n\n\t\t// We swap the action types as well.\n\t\t_insert = 'delete';\n\t\t_delete = 'insert';\n\t} else {\n\t\t_insert = 'insert';\n\t\t_delete = 'delete';\n\t}\n\n\tconst m = a.length;\n\tconst n = b.length;\n\tconst delta = n - m;\n\n\t// Edit scripts, for each diagonal.\n\tconst es = {};\n\t// Furthest points, the furthest y we can get on each diagonal.\n\tconst fp = {};\n\n\tfunction snake( k ) {\n\t\t// We use -1 as an alternative below to handle initial values ( instead of filling the fp with -1 first ).\n\t\t// Furthest points (y) on the diagonal below k.\n\t\tconst y1 = ( fp[ k - 1 ] !== undefined ? fp[ k - 1 ] : -1 ) + 1;\n\t\t// Furthest points (y) on the diagonal above k.\n\t\tconst y2 = fp[ k + 1 ] !== undefined ? fp[ k + 1 ] : -1;\n\t\t// The way we should go to get further.\n\t\tconst dir = y1 > y2 ? -1 : 1;\n\n\t\t// Clone previous changes array (if any).\n\t\tif ( es[ k + dir ] ) {\n\t\t\tes[ k ] = es[ k + dir ].slice( 0 );\n\t\t}\n\n\t\t// Create changes array.\n\t\tif ( !es[ k ] ) {\n\t\t\tes[ k ] = [];\n\t\t}\n\n\t\t// Push the action.\n\t\tes[ k ].push( y1 > y2 ? _insert : _delete );\n\n\t\t// Set the beginning coordinates.\n\t\tlet y = Math.max( y1, y2 );\n\t\tlet x = y - k;\n\n\t\t// Traverse the diagonal as long as the values match.\n\t\twhile ( x < m && y < n && cmp( a[ x ], b[ y ] ) ) {\n\t\t\tx++;\n\t\t\ty++;\n\t\t\t// Push no change action.\n\t\t\tes[ k ].push( 'equal' );\n\t\t}\n\n\t\treturn y;\n\t}\n\n\tlet p = 0;\n\tlet k;\n\n\t// Traverse the graph until we reach the end of the longer string.\n\tdo {\n\t\t// Updates furthest points and edit scripts for diagonals below delta.\n\t\tfor ( k = -p; k < delta; k++ ) {\n\t\t\tfp[ k ] = snake( k );\n\t\t}\n\n\t\t// Updates furthest points and edit scripts for diagonals above delta.\n\t\tfor ( k = delta + p; k > delta; k-- ) {\n\t\t\tfp[ k ] = snake( k );\n\t\t}\n\n\t\t// Updates furthest point and edit script for the delta diagonal.\n\t\t// note that the delta diagonal is the one which goes through the sink (m, n).\n\t\tfp[ delta ] = snake( delta );\n\n\t\tp++;\n\t} while ( fp[ delta ] !== n );\n\n\t// Return the final list of edit changes.\n\t// We remove the first item that represents the action for the injected nulls.\n\treturn es[ delta ].slice( 1 );\n}\n\n// Store the API in static property to easily overwrite it in tests.\n// Too bad dependency injection does not work in Webpack + ES 6 (const) + Babel.\ndiff.fastDiff = fastDiff;\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module utils/dom/insertat\n */\n\n/**\n * Inserts node to the parent at given index.\n *\n * @param {Element} parentElement Parent element.\n * @param {Number} index Insertions index.\n * @param {Node} nodeToInsert Node to insert.\n */\nexport default function insertAt( parentElement, index, nodeToInsert ) {\n\tparentElement.insertBefore( nodeToInsert, parentElement.childNodes[ index ] || null );\n}\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module utils/dom/remove\n */\n\n/**\n * Removes given node from parent.\n *\n * @param {Node} node Node to remove.\n */\nexport default function remove( node ) {\n\tconst parent = node.parentNode;\n\n\tif ( parent ) {\n\t\tparent.removeChild( node );\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module utils/dom/isnode\n */\n\n/**\n * Checks if the object is a native DOM Node.\n *\n * @param {*} obj\n * @returns {Boolean}\n */\nexport default function isNode( obj ) {\n\tif ( obj ) {\n\t\tif ( obj.defaultView ) {\n\t\t\treturn obj instanceof obj.defaultView.Document;\n\t\t} else if ( obj.ownerDocument && obj.ownerDocument.defaultView ) {\n\t\t\treturn obj instanceof obj.ownerDocument.defaultView.Node;\n\t\t}\n\t}\n\n\treturn false;\n}\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/* globals Node */\n\n/**\n * @module engine/view/renderer\n */\n\nimport ViewText from './text';\nimport ViewPosition from './position';\nimport { INLINE_FILLER, INLINE_FILLER_LENGTH, startsWithFiller, isInlineFiller } from './filler';\n\nimport mix from '@ckeditor/ckeditor5-utils/src/mix';\nimport diff from '@ckeditor/ckeditor5-utils/src/diff';\nimport insertAt from '@ckeditor/ckeditor5-utils/src/dom/insertat';\nimport remove from '@ckeditor/ckeditor5-utils/src/dom/remove';\nimport ObservableMixin from '@ckeditor/ckeditor5-utils/src/observablemixin';\nimport CKEditorError from '@ckeditor/ckeditor5-utils/src/ckeditorerror';\nimport isText from '@ckeditor/ckeditor5-utils/src/dom/istext';\nimport isNode from '@ckeditor/ckeditor5-utils/src/dom/isnode';\nimport fastDiff from '@ckeditor/ckeditor5-utils/src/fastdiff';\nimport env from '@ckeditor/ckeditor5-utils/src/env';\n\n/**\n * Renderer is responsible for updating the DOM structure and the DOM selection based on\n * the {@link module:engine/view/renderer~Renderer#markToSync information about updated view nodes}.\n * In other words, it renders the view to the DOM.\n *\n * Its main responsibility is to make only the necessary, minimal changes to the DOM. However, unlike in many\n * virtual DOM implementations, the primary reason for doing minimal changes is not the performance but ensuring\n * that native editing features such as text composition, autocompletion, spell checking, selection's x-index are\n * affected as little as possible.\n *\n * Renderer uses {@link module:engine/view/domconverter~DomConverter} to transform view nodes and positions\n * to and from the DOM.\n */\nexport default class Renderer {\n\t/**\n\t * Creates a renderer instance.\n\t *\n\t * @param {module:engine/view/domconverter~DomConverter} domConverter Converter instance.\n\t * @param {module:engine/view/documentselection~DocumentSelection} selection View selection.\n\t */\n\tconstructor( domConverter, selection ) {\n\t\t/**\n\t\t * Set of DOM Documents instances.\n\t\t *\n\t\t * @readonly\n\t\t * @member {Set.<Document>}\n\t\t */\n\t\tthis.domDocuments = new Set();\n\n\t\t/**\n\t\t * Converter instance.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:engine/view/domconverter~DomConverter}\n\t\t */\n\t\tthis.domConverter = domConverter;\n\n\t\t/**\n\t\t * Set of nodes which attributes changed and may need to be rendered.\n\t\t *\n\t\t * @readonly\n\t\t * @member {Set.<module:engine/view/node~Node>}\n\t\t */\n\t\tthis.markedAttributes = new Set();\n\n\t\t/**\n\t\t * Set of elements which child lists changed and may need to be rendered.\n\t\t *\n\t\t * @readonly\n\t\t * @member {Set.<module:engine/view/node~Node>}\n\t\t */\n\t\tthis.markedChildren = new Set();\n\n\t\t/**\n\t\t * Set of text nodes which text data changed and may need to be rendered.\n\t\t *\n\t\t * @readonly\n\t\t * @member {Set.<module:engine/view/node~Node>}\n\t\t */\n\t\tthis.markedTexts = new Set();\n\n\t\t/**\n\t\t * View selection. Renderer updates DOM selection based on the view selection.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:engine/view/documentselection~DocumentSelection}\n\t\t */\n\t\tthis.selection = selection;\n\n\t\t/**\n\t\t * Indicates if the view document is focused and selection can be rendered. Selection will not be rendered if\n\t\t * this is set to `false`.\n\t\t *\n\t\t * @member {Boolean}\n\t\t */\n\t\tthis.isFocused = false;\n\n\t\t/**\n\t\t * The text node in which the inline filler was rendered.\n\t\t *\n\t\t * @private\n\t\t * @member {Text}\n\t\t */\n\t\tthis._inlineFiller = null;\n\n\t\t/**\n\t\t * DOM element containing fake selection.\n\t\t *\n\t\t * @private\n\t\t * @type {null|HTMLElement}\n\t\t */\n\t\tthis._fakeSelectionContainer = null;\n\t}\n\n\t/**\n\t * Marks a view node to be updated in the DOM by {@link #render `render()`}.\n\t *\n\t * Note that only view nodes whose parents have corresponding DOM elements need to be marked to be synchronized.\n\t *\n\t * @see #markedAttributes\n\t * @see #markedChildren\n\t * @see #markedTexts\n\t *\n\t * @param {module:engine/view/document~ChangeType} type Type of the change.\n\t * @param {module:engine/view/node~Node} node Node to be marked.\n\t */\n\tmarkToSync( type, node ) {\n\t\tif ( type === 'text' ) {\n\t\t\tif ( this.domConverter.mapViewToDom( node.parent ) ) {\n\t\t\t\tthis.markedTexts.add( node );\n\t\t\t}\n\t\t} else {\n\t\t\t// If the node has no DOM element it is not rendered yet,\n\t\t\t// its children/attributes do not need to be marked to be sync.\n\t\t\tif ( !this.domConverter.mapViewToDom( node ) ) {\n\t\t\t\treturn;\n\t\t\t}\n\n\t\t\tif ( type === 'attributes' ) {\n\t\t\t\tthis.markedAttributes.add( node );\n\t\t\t} else if ( type === 'children' ) {\n\t\t\t\tthis.markedChildren.add( node );\n\t\t\t} else {\n\t\t\t\t/**\n\t\t\t\t * Unknown type passed to Renderer.markToSync.\n\t\t\t\t *\n\t\t\t\t * @error view-renderer-unknown-type\n\t\t\t\t */\n\t\t\t\tthrow new CKEditorError( 'view-renderer-unknown-type', this );\n\t\t\t}\n\t\t}\n\t}\n\n\t/**\n\t * Renders all buffered changes ({@link #markedAttributes}, {@link #markedChildren} and {@link #markedTexts}) and\n\t * the current view selection (if needed) to the DOM by applying a minimal set of changes to it.\n\t *\n\t * Renderer tries not to break the text composition (e.g. IME) and x-index of the selection,\n\t * so it does as little as it is needed to update the DOM.\n\t *\n\t * Renderer also handles {@link module:engine/view/filler fillers}. Especially, it checks if the inline filler is needed\n\t * at the selection position and adds or removes it. To prevent breaking text composition inline filler will not be\n\t * removed as long as the selection is in the text node which needed it at first.\n\t */\n\trender() {\n\t\tlet inlineFillerPosition;\n\n\t\t// Refresh mappings.\n\t\tfor ( const element of this.markedChildren ) {\n\t\t\tthis._updateChildrenMappings( element );\n\t\t}\n\n\t\t// There was inline filler rendered in the DOM but it's not\n\t\t// at the selection position any more, so we can remove it\n\t\t// (cause even if it's needed, it must be placed in another location).\n\t\tif ( this._inlineFiller && !this._isSelectionInInlineFiller() ) {\n\t\t\tthis._removeInlineFiller();\n\t\t}\n\n\t\t// If we've got the filler, let's try to guess its position in the view.\n\t\tif ( this._inlineFiller ) {\n\t\t\tinlineFillerPosition = this._getInlineFillerPosition();\n\t\t}\n\t\t// Otherwise, if it's needed, create it at the selection position.\n\t\telse if ( this._needsInlineFillerAtSelection() ) {\n\t\t\tinlineFillerPosition = this.selection.getFirstPosition();\n\n\t\t\t// Do not use `markToSync` so it will be added even if the parent is already added.\n\t\t\tthis.markedChildren.add( inlineFillerPosition.parent );\n\t\t}\n\n\t\tfor ( const element of this.markedAttributes ) {\n\t\t\tthis._updateAttrs( element );\n\t\t}\n\n\t\tfor ( const element of this.markedChildren ) {\n\t\t\tthis._updateChildren( element, { inlineFillerPosition } );\n\t\t}\n\n\t\tfor ( const node of this.markedTexts ) {\n\t\t\tif ( !this.markedChildren.has( node.parent ) && this.domConverter.mapViewToDom( node.parent ) ) {\n\t\t\t\tthis._updateText( node, { inlineFillerPosition } );\n\t\t\t}\n\t\t}\n\n\t\t// Check whether the inline filler is required and where it really is in the DOM.\n\t\t// At this point in most cases it will be in the DOM, but there are exceptions.\n\t\t// For example, if the inline filler was deep in the created DOM structure, it will not be created.\n\t\t// Similarly, if it was removed at the beginning of this function and then neither text nor children were updated,\n\t\t// it will not be present.\n\t\t// Fix those and similar scenarios.\n\t\tif ( inlineFillerPosition ) {\n\t\t\tconst fillerDomPosition = this.domConverter.viewPositionToDom( inlineFillerPosition );\n\t\t\tconst domDocument = fillerDomPosition.parent.ownerDocument;\n\n\t\t\tif ( !startsWithFiller( fillerDomPosition.parent ) ) {\n\t\t\t\t// Filler has not been created at filler position. Create it now.\n\t\t\t\tthis._inlineFiller = addInlineFiller( domDocument, fillerDomPosition.parent, fillerDomPosition.offset );\n\t\t\t} else {\n\t\t\t\t// Filler has been found, save it.\n\t\t\t\tthis._inlineFiller = fillerDomPosition.parent;\n\t\t\t}\n\t\t} else {\n\t\t\t// There is no filler needed.\n\t\t\tthis._inlineFiller = null;\n\t\t}\n\n\t\tthis._updateSelection();\n\t\tthis._updateFocus();\n\n\t\tthis.markedTexts.clear();\n\t\tthis.markedAttributes.clear();\n\t\tthis.markedChildren.clear();\n\t}\n\n\t/**\n\t * Updates mappings of view element's children.\n\t *\n\t * Children that were replaced in the view structure by similar elements (same tag name) are treated as 'replaced'.\n\t * This means that their mappings can be updated so the new view elements are mapped to the existing DOM elements.\n\t * Thanks to that these elements do not need to be re-rendered completely.\n\t *\n\t * @private\n\t * @param {module:engine/view/node~Node} viewElement The view element whose children mappings will be updated.\n\t */\n\t_updateChildrenMappings( viewElement ) {\n\t\tconst domElement = this.domConverter.mapViewToDom( viewElement );\n\n\t\tif ( !domElement ) {\n\t\t\t// If there is no `domElement` it means that it was already removed from DOM and there is no need to process it.\n\t\t\treturn;\n\t\t}\n\n\t\tconst actualDomChildren = this.domConverter.mapViewToDom( viewElement ).childNodes;\n\t\tconst expectedDomChildren = Array.from(\n\t\t\tthis.domConverter.viewChildrenToDom( viewElement, domElement.ownerDocument, { withChildren: false } )\n\t\t);\n\t\tconst diff = this._diffNodeLists( actualDomChildren, expectedDomChildren );\n\t\tconst actions = this._findReplaceActions( diff, actualDomChildren, expectedDomChildren );\n\n\t\tif ( actions.indexOf( 'replace' ) !== -1 ) {\n\t\t\tconst counter = { equal: 0, insert: 0, delete: 0 };\n\n\t\t\tfor ( const action of actions ) {\n\t\t\t\tif ( action === 'replace' ) {\n\t\t\t\t\tconst insertIndex = counter.equal + counter.insert;\n\t\t\t\t\tconst deleteIndex = counter.equal + counter.delete;\n\t\t\t\t\tconst viewChild = viewElement.getChild( insertIndex );\n\n\t\t\t\t\t// UIElement and RawElement are special cases. Their children are not stored in a view (#799)\n\t\t\t\t\t// so we cannot use them with replacing flow (since they use view children during rendering\n\t\t\t\t\t// which will always result in rendering empty elements).\n\t\t\t\t\tif ( viewChild && !( viewChild.is( 'uiElement' ) || viewChild.is( 'rawElement' ) ) ) {\n\t\t\t\t\t\tthis._updateElementMappings( viewChild, actualDomChildren[ deleteIndex ] );\n\t\t\t\t\t}\n\n\t\t\t\t\tremove( expectedDomChildren[ insertIndex ] );\n\t\t\t\t\tcounter.equal++;\n\t\t\t\t} else {\n\t\t\t\t\tcounter[ action ]++;\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\t}\n\n\t/**\n\t * Updates mappings of a given view element.\n\t *\n\t * @private\n\t * @param {module:engine/view/node~Node} viewElement The view element whose mappings will be updated.\n\t * @param {Node} domElement The DOM element representing the given view element.\n\t */\n\t_updateElementMappings( viewElement, domElement ) {\n\t\t// Remap 'DomConverter' bindings.\n\t\tthis.domConverter.unbindDomElement( domElement );\n\t\tthis.domConverter.bindElements( domElement, viewElement );\n\n\t\t// View element may have children which needs to be updated, but are not marked, mark them to update.\n\t\tthis.markedChildren.add( viewElement );\n\n\t\t// Because we replace new view element mapping with the existing one, the corresponding DOM element\n\t\t// will not be rerendered. The new view element may have different attributes than the previous one.\n\t\t// Since its corresponding DOM element will not be rerendered, new attributes will not be added\n\t\t// to the DOM, so we need to mark it here to make sure its attributes gets updated. See #1427 for more\n\t\t// detailed case study.\n\t\t// Also there are cases where replaced element is removed from the view structure and then has\n\t\t// its attributes changed or removed. In such cases the element will not be present in `markedAttributes`\n\t\t// and also may be the same (`element.isSimilar()`) as the reused element not having its attributes updated.\n\t\t// To prevent such situations we always mark reused element to have its attributes rerenderd (#1560).\n\t\tthis.markedAttributes.add( viewElement );\n\t}\n\n\t/**\n\t * Gets the position of the inline filler based on the current selection.\n\t * Here, we assume that we know that the filler is needed and\n\t * {@link #_isSelectionInInlineFiller is at the selection position}, and, since it is needed,\n\t * it is somewhere at the selection position.\n\t *\n\t * Note: The filler position cannot be restored based on the filler's DOM text node, because\n\t * when this method is called (before rendering), the bindings will often be broken. View-to-DOM\n\t * bindings are only dependable after rendering.\n\t *\n\t * @private\n\t * @returns {module:engine/view/position~Position}\n\t */\n\t_getInlineFillerPosition() {\n\t\tconst firstPos = this.selection.getFirstPosition();\n\n\t\tif ( firstPos.parent.is( '$text' ) ) {\n\t\t\treturn ViewPosition._createBefore( this.selection.getFirstPosition().parent );\n\t\t} else {\n\t\t\treturn firstPos;\n\t\t}\n\t}\n\n\t/**\n\t * Returns `true` if the selection has not left the inline filler's text node.\n\t * If it is `true`, it means that the filler had been added for a reason and the selection did not\n\t * leave the filler's text node. For example, the user can be in the middle of a composition so it should not be touched.\n\t *\n\t * @private\n\t * @returns {Boolean} `true` if the inline filler and selection are in the same place.\n\t */\n\t_isSelectionInInlineFiller() {\n\t\tif ( this.selection.rangeCount != 1 || !this.selection.isCollapsed ) {\n\t\t\treturn false;\n\t\t}\n\n\t\t// Note, we can't check if selection's position equals position of the\n\t\t// this._inlineFiller node, because of #663. We may not be able to calculate\n\t\t// the filler's position in the view at this stage.\n\t\t// Instead, we check it the other way – whether selection is anchored in\n\t\t// that text node or next to it.\n\n\t\t// Possible options are:\n\t\t// \"FILLER{}\"\n\t\t// \"FILLERadded-text{}\"\n\t\tconst selectionPosition = this.selection.getFirstPosition();\n\t\tconst position = this.domConverter.viewPositionToDom( selectionPosition );\n\n\t\tif ( position && isText( position.parent ) && startsWithFiller( position.parent ) ) {\n\t\t\treturn true;\n\t\t}\n\n\t\treturn false;\n\t}\n\n\t/**\n\t * Removes the inline filler.\n\t *\n\t * @private\n\t */\n\t_removeInlineFiller() {\n\t\tconst domFillerNode = this._inlineFiller;\n\n\t\t// Something weird happened and the stored node doesn't contain the filler's text.\n\t\tif ( !startsWithFiller( domFillerNode ) ) {\n\t\t\t/**\n\t\t\t * The inline filler node was lost. Most likely, something overwrote the filler text node\n\t\t\t * in the DOM.\n\t\t\t *\n\t\t\t * @error view-renderer-filler-was-lost\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'view-renderer-filler-was-lost', this );\n\t\t}\n\n\t\tif ( isInlineFiller( domFillerNode ) ) {\n\t\t\tdomFillerNode.parentNode.removeChild( domFillerNode );\n\t\t} else {\n\t\t\tdomFillerNode.data = domFillerNode.data.substr( INLINE_FILLER_LENGTH );\n\t\t}\n\n\t\tthis._inlineFiller = null;\n\t}\n\n\t/**\n\t * Checks if the inline {@link module:engine/view/filler filler} should be added.\n\t *\n\t * @private\n\t * @returns {Boolean} `true` if the inline filler should be added.\n\t */\n\t_needsInlineFillerAtSelection() {\n\t\tif ( this.selection.rangeCount != 1 || !this.selection.isCollapsed ) {\n\t\t\treturn false;\n\t\t}\n\n\t\tconst selectionPosition = this.selection.getFirstPosition();\n\t\tconst selectionParent = selectionPosition.parent;\n\t\tconst selectionOffset = selectionPosition.offset;\n\n\t\t// If there is no DOM root we do not care about fillers.\n\t\tif ( !this.domConverter.mapViewToDom( selectionParent.root ) ) {\n\t\t\treturn false;\n\t\t}\n\n\t\tif ( !( selectionParent.is( 'element' ) ) ) {\n\t\t\treturn false;\n\t\t}\n\n\t\t// Prevent adding inline filler inside elements with contenteditable=false.\n\t\t// https://github.com/ckeditor/ckeditor5-engine/issues/1170\n\t\tif ( !isEditable( selectionParent ) ) {\n\t\t\treturn false;\n\t\t}\n\n\t\t// We have block filler, we do not need inline one.\n\t\tif ( selectionOffset === selectionParent.getFillerOffset() ) {\n\t\t\treturn false;\n\t\t}\n\n\t\tconst nodeBefore = selectionPosition.nodeBefore;\n\t\tconst nodeAfter = selectionPosition.nodeAfter;\n\n\t\tif ( nodeBefore instanceof ViewText || nodeAfter instanceof ViewText ) {\n\t\t\treturn false;\n\t\t}\n\n\t\treturn true;\n\t}\n\n\t/**\n\t * Checks if text needs to be updated and possibly updates it.\n\t *\n\t * @private\n\t * @param {module:engine/view/text~Text} viewText View text to update.\n\t * @param {Object} options\n\t * @param {module:engine/view/position~Position} options.inlineFillerPosition The position where the inline\n\t * filler should be rendered.\n\t */\n\t_updateText( viewText, options ) {\n\t\tconst domText = this.domConverter.findCorrespondingDomText( viewText );\n\t\tconst newDomText = this.domConverter.viewToDom( viewText, domText.ownerDocument );\n\n\t\tconst actualText = domText.data;\n\t\tlet expectedText = newDomText.data;\n\n\t\tconst filler = options.inlineFillerPosition;\n\n\t\tif ( filler && filler.parent == viewText.parent && filler.offset == viewText.index ) {\n\t\t\texpectedText = INLINE_FILLER + expectedText;\n\t\t}\n\n\t\tif ( actualText != expectedText ) {\n\t\t\tconst actions = fastDiff( actualText, expectedText );\n\n\t\t\tfor ( const action of actions ) {\n\t\t\t\tif ( action.type === 'insert' ) {\n\t\t\t\t\tdomText.insertData( action.index, action.values.join( '' ) );\n\t\t\t\t} else { // 'delete'\n\t\t\t\t\tdomText.deleteData( action.index, action.howMany );\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\t}\n\n\t/**\n\t * Checks if attribute list needs to be updated and possibly updates it.\n\t *\n\t * @private\n\t * @param {module:engine/view/element~Element} viewElement The view element to update.\n\t */\n\t_updateAttrs( viewElement ) {\n\t\tconst domElement = this.domConverter.mapViewToDom( viewElement );\n\n\t\tif ( !domElement ) {\n\t\t\t// If there is no `domElement` it means that 'viewElement' is outdated as its mapping was updated\n\t\t\t// in 'this._updateChildrenMappings()'. There is no need to process it as new view element which\n\t\t\t// replaced old 'viewElement' mapping was also added to 'this.markedAttributes'\n\t\t\t// in 'this._updateChildrenMappings()' so it will be processed separately.\n\t\t\treturn;\n\t\t}\n\n\t\tconst domAttrKeys = Array.from( domElement.attributes ).map( attr => attr.name );\n\t\tconst viewAttrKeys = viewElement.getAttributeKeys();\n\n\t\t// Add or overwrite attributes.\n\t\tfor ( const key of viewAttrKeys ) {\n\t\t\tdomElement.setAttribute( key, viewElement.getAttribute( key ) );\n\t\t}\n\n\t\t// Remove from DOM attributes which do not exists in the view.\n\t\tfor ( const key of domAttrKeys ) {\n\t\t\tif ( !viewElement.hasAttribute( key ) ) {\n\t\t\t\tdomElement.removeAttribute( key );\n\t\t\t}\n\t\t}\n\t}\n\n\t/**\n\t * Checks if elements child list needs to be updated and possibly updates it.\n\t *\n\t * @private\n\t * @param {module:engine/view/element~Element} viewElement View element to update.\n\t * @param {Object} options\n\t * @param {module:engine/view/position~Position} options.inlineFillerPosition The position where the inline\n\t * filler should be rendered.\n\t */\n\t_updateChildren( viewElement, options ) {\n\t\tconst domElement = this.domConverter.mapViewToDom( viewElement );\n\n\t\tif ( !domElement ) {\n\t\t\t// If there is no `domElement` it means that it was already removed from DOM.\n\t\t\t// There is no need to process it. It will be processed when re-inserted.\n\t\t\treturn;\n\t\t}\n\n\t\tconst inlineFillerPosition = options.inlineFillerPosition;\n\t\tconst actualDomChildren = this.domConverter.mapViewToDom( viewElement ).childNodes;\n\t\tconst expectedDomChildren = Array.from(\n\t\t\tthis.domConverter.viewChildrenToDom( viewElement, domElement.ownerDocument, { bind: true, inlineFillerPosition } )\n\t\t);\n\n\t\t// Inline filler element has to be created as it is present in the DOM, but not in the view. It is required\n\t\t// during diffing so text nodes could be compared correctly and also during rendering to maintain\n\t\t// proper order and indexes while updating the DOM.\n\t\tif ( inlineFillerPosition && inlineFillerPosition.parent === viewElement ) {\n\t\t\taddInlineFiller( domElement.ownerDocument, expectedDomChildren, inlineFillerPosition.offset );\n\t\t}\n\n\t\tconst diff = this._diffNodeLists( actualDomChildren, expectedDomChildren );\n\n\t\tlet i = 0;\n\t\tconst nodesToUnbind = new Set();\n\n\t\t// Handle deletions first.\n\t\t// This is to prevent a situation where an element that already exists in `actualDomChildren` is inserted at a different\n\t\t// index in `actualDomChildren`. Since `actualDomChildren` is a `NodeList`, this works like move, not like an insert,\n\t\t// and it disrupts the whole algorithm. See https://github.com/ckeditor/ckeditor5/issues/6367.\n\t\t//\n\t\t// It doesn't matter in what order we remove or add nodes, as long as we remove and add correct nodes at correct indexes.\n\t\tfor ( const action of diff ) {\n\t\t\tif ( action === 'delete' ) {\n\t\t\t\tnodesToUnbind.add( actualDomChildren[ i ] );\n\t\t\t\tremove( actualDomChildren[ i ] );\n\t\t\t} else if ( action === 'equal' ) {\n\t\t\t\ti++;\n\t\t\t}\n\t\t}\n\n\t\ti = 0;\n\n\t\tfor ( const action of diff ) {\n\t\t\tif ( action === 'insert' ) {\n\t\t\t\tinsertAt( domElement, i, expectedDomChildren[ i ] );\n\t\t\t\ti++;\n\t\t\t} else if ( action === 'equal' ) {\n\t\t\t\t// Force updating text nodes inside elements which did not change and do not need to be re-rendered (#1125).\n\t\t\t\t// Do it here (not in the loop above) because only after insertions the `i` index is correct.\n\t\t\t\tthis._markDescendantTextToSync( this.domConverter.domToView( expectedDomChildren[ i ] ) );\n\t\t\t\ti++;\n\t\t\t}\n\t\t}\n\n\t\t// Unbind removed nodes. When node does not have a parent it means that it was removed from DOM tree during\n\t\t// comparison with the expected DOM. We don't need to check child nodes, because if child node was reinserted,\n\t\t// it was moved to DOM tree out of the removed node.\n\t\tfor ( const node of nodesToUnbind ) {\n\t\t\tif ( !node.parentNode ) {\n\t\t\t\tthis.domConverter.unbindDomElement( node );\n\t\t\t}\n\t\t}\n\t}\n\n\t/**\n\t * Shorthand for diffing two arrays or node lists of DOM nodes.\n\t *\n\t * @private\n\t * @param {Array.<Node>|NodeList} actualDomChildren Actual DOM children\n\t * @param {Array.<Node>|NodeList} expectedDomChildren Expected DOM children.\n\t * @returns {Array.<String>} The list of actions based on the {@link module:utils/diff~diff} function.\n\t */\n\t_diffNodeLists( actualDomChildren, expectedDomChildren ) {\n\t\tactualDomChildren = filterOutFakeSelectionContainer( actualDomChildren, this._fakeSelectionContainer );\n\n\t\treturn diff( actualDomChildren, expectedDomChildren, sameNodes.bind( null, this.domConverter ) );\n\t}\n\n\t/**\n\t * Finds DOM nodes that were replaced with the similar nodes (same tag name) in the view. All nodes are compared\n\t * within one `insert`/`delete` action group, for example:\n\t *\n\t * \t\tActual DOM:\t\t<p><b>Foo</b>Bar<i>Baz</i><b>Bax</b></p>\n\t * \t\tExpected DOM:\t<p>Bar<b>123</b><i>Baz</i><b>456</b></p>\n\t * \t\tInput actions:\t[ insert, insert, delete, delete, equal, insert, delete ]\n\t * \t\tOutput actions:\t[ insert, replace, delete, equal, replace ]\n\t *\n\t * @private\n\t * @param {Array.<String>} actions Actions array which is a result of the {@link module:utils/diff~diff} function.\n\t * @param {Array.<Node>|NodeList} actualDom Actual DOM children\n\t * @param {Array.<Node>} expectedDom Expected DOM children.\n\t * @returns {Array.<String>} Actions array modified with the `replace` actions.\n\t */\n\t_findReplaceActions( actions, actualDom, expectedDom ) {\n\t\t// If there is no both 'insert' and 'delete' actions, no need to check for replaced elements.\n\t\tif ( actions.indexOf( 'insert' ) === -1 || actions.indexOf( 'delete' ) === -1 ) {\n\t\t\treturn actions;\n\t\t}\n\n\t\tlet newActions = [];\n\t\tlet actualSlice = [];\n\t\tlet expectedSlice = [];\n\n\t\tconst counter = { equal: 0, insert: 0, delete: 0 };\n\n\t\tfor ( const action of actions ) {\n\t\t\tif ( action === 'insert' ) {\n\t\t\t\texpectedSlice.push( expectedDom[ counter.equal + counter.insert ] );\n\t\t\t} else if ( action === 'delete' ) {\n\t\t\t\tactualSlice.push( actualDom[ counter.equal + counter.delete ] );\n\t\t\t} else { // equal\n\t\t\t\tnewActions = newActions.concat( diff( actualSlice, expectedSlice, areSimilar ).map( x => x === 'equal' ? 'replace' : x ) );\n\t\t\t\tnewActions.push( 'equal' );\n\t\t\t\t// Reset stored elements on 'equal'.\n\t\t\t\tactualSlice = [];\n\t\t\t\texpectedSlice = [];\n\t\t\t}\n\t\t\tcounter[ action ]++;\n\t\t}\n\n\t\treturn newActions.concat( diff( actualSlice, expectedSlice, areSimilar ).map( x => x === 'equal' ? 'replace' : x ) );\n\t}\n\n\t/**\n\t * Marks text nodes to be synchronized.\n\t *\n\t * If a text node is passed, it will be marked. If an element is passed, all descendant text nodes inside it will be marked.\n\t *\n\t * @private\n\t * @param {module:engine/view/node~Node} viewNode View node to sync.\n\t */\n\t_markDescendantTextToSync( viewNode ) {\n\t\tif ( !viewNode ) {\n\t\t\treturn;\n\t\t}\n\n\t\tif ( viewNode.is( '$text' ) ) {\n\t\t\tthis.markedTexts.add( viewNode );\n\t\t} else if ( viewNode.is( 'element' ) ) {\n\t\t\tfor ( const child of viewNode.getChildren() ) {\n\t\t\t\tthis._markDescendantTextToSync( child );\n\t\t\t}\n\t\t}\n\t}\n\n\t/**\n\t * Checks if the selection needs to be updated and possibly updates it.\n\t *\n\t * @private\n\t */\n\t_updateSelection() {\n\t\t// If there is no selection - remove DOM and fake selections.\n\t\tif ( this.selection.rangeCount === 0 ) {\n\t\t\tthis._removeDomSelection();\n\t\t\tthis._removeFakeSelection();\n\n\t\t\treturn;\n\t\t}\n\n\t\tconst domRoot = this.domConverter.mapViewToDom( this.selection.editableElement );\n\n\t\t// Do nothing if there is no focus, or there is no DOM element corresponding to selection's editable element.\n\t\tif ( !this.isFocused || !domRoot ) {\n\t\t\treturn;\n\t\t}\n\n\t\t// Render selection.\n\t\tif ( this.selection.isFake ) {\n\t\t\tthis._updateFakeSelection( domRoot );\n\t\t} else {\n\t\t\tthis._removeFakeSelection();\n\t\t\tthis._updateDomSelection( domRoot );\n\t\t}\n\t}\n\n\t/**\n\t * Updates the fake selection.\n\t *\n\t * @private\n\t * @param {HTMLElement} domRoot A valid DOM root where the fake selection container should be added.\n\t */\n\t_updateFakeSelection( domRoot ) {\n\t\tconst domDocument = domRoot.ownerDocument;\n\n\t\tif ( !this._fakeSelectionContainer ) {\n\t\t\tthis._fakeSelectionContainer = createFakeSelectionContainer( domDocument );\n\t\t}\n\n\t\tconst container = this._fakeSelectionContainer;\n\n\t\t// Bind fake selection container with the current selection *position*.\n\t\tthis.domConverter.bindFakeSelection( container, this.selection );\n\n\t\tif ( !this._fakeSelectionNeedsUpdate( domRoot ) ) {\n\t\t\treturn;\n\t\t}\n\n\t\tif ( !container.parentElement || container.parentElement != domRoot ) {\n\t\t\tdomRoot.appendChild( container );\n\t\t}\n\n\t\tcontainer.textContent = this.selection.fakeSelectionLabel || '\\u00A0';\n\n\t\tconst domSelection = domDocument.getSelection();\n\t\tconst domRange = domDocument.createRange();\n\n\t\tdomSelection.removeAllRanges();\n\t\tdomRange.selectNodeContents( container );\n\t\tdomSelection.addRange( domRange );\n\t}\n\n\t/**\n\t * Updates the DOM selection.\n\t *\n\t * @private\n\t * @param {HTMLElement} domRoot A valid DOM root where the DOM selection should be rendered.\n\t */\n\t_updateDomSelection( domRoot ) {\n\t\tconst domSelection = domRoot.ownerDocument.defaultView.getSelection();\n\n\t\t// Let's check whether DOM selection needs updating at all.\n\t\tif ( !this._domSelectionNeedsUpdate( domSelection ) ) {\n\t\t\treturn;\n\t\t}\n\n\t\t// Multi-range selection is not available in most browsers, and, at least in Chrome, trying to\n\t\t// set such selection, that is not continuous, throws an error. Because of that, we will just use anchor\n\t\t// and focus of view selection.\n\t\t// Since we are not supporting multi-range selection, we also do not need to check if proper editable is\n\t\t// selected. If there is any editable selected, it is okay (editable is taken from selection anchor).\n\t\tconst anchor = this.domConverter.viewPositionToDom( this.selection.anchor );\n\t\tconst focus = this.domConverter.viewPositionToDom( this.selection.focus );\n\n\t\t// Focus the new editing host.\n\t\t// Otherwise, FF may throw an error (https://github.com/ckeditor/ckeditor5/issues/721).\n\t\tdomRoot.focus();\n\n\t\tdomSelection.collapse( anchor.parent, anchor.offset );\n\t\tdomSelection.extend( focus.parent, focus.offset );\n\n\t\t// Firefox–specific hack (https://github.com/ckeditor/ckeditor5-engine/issues/1439).\n\t\tif ( env.isGecko ) {\n\t\t\tfixGeckoSelectionAfterBr( focus, domSelection );\n\t\t}\n\t}\n\n\t/**\n\t * Checks whether a given DOM selection needs to be updated.\n\t *\n\t * @private\n\t * @param {Selection} domSelection The DOM selection to check.\n\t * @returns {Boolean}\n\t */\n\t_domSelectionNeedsUpdate( domSelection ) {\n\t\tif ( !this.domConverter.isDomSelectionCorrect( domSelection ) ) {\n\t\t\t// Current DOM selection is in incorrect position. We need to update it.\n\t\t\treturn true;\n\t\t}\n\n\t\tconst oldViewSelection = domSelection && this.domConverter.domSelectionToView( domSelection );\n\n\t\tif ( oldViewSelection && this.selection.isEqual( oldViewSelection ) ) {\n\t\t\treturn false;\n\t\t}\n\n\t\t// If selection is not collapsed, it does not need to be updated if it is similar.\n\t\tif ( !this.selection.isCollapsed && this.selection.isSimilar( oldViewSelection ) ) {\n\t\t\t// Selection did not changed and is correct, do not update.\n\t\t\treturn false;\n\t\t}\n\n\t\t// Selections are not similar.\n\t\treturn true;\n\t}\n\n\t/**\n\t * Checks whether the fake selection needs to be updated.\n\t *\n\t * @private\n\t * @param {HTMLElement} domRoot A valid DOM root where a new fake selection container should be added.\n\t * @returns {Boolean}\n\t */\n\t_fakeSelectionNeedsUpdate( domRoot ) {\n\t\tconst container = this._fakeSelectionContainer;\n\t\tconst domSelection = domRoot.ownerDocument.getSelection();\n\n\t\t// Fake selection needs to be updated if there's no fake selection container, or the container currently sits\n\t\t// in a different root.\n\t\tif ( !container || container.parentElement !== domRoot ) {\n\t\t\treturn true;\n\t\t}\n\n\t\t// Make sure that the selection actually is within the fake selection.\n\t\tif ( domSelection.anchorNode !== container && !container.contains( domSelection.anchorNode ) ) {\n\t\t\treturn true;\n\t\t}\n\n\t\treturn container.textContent !== this.selection.fakeSelectionLabel;\n\t}\n\n\t/**\n\t * Removes the DOM selection.\n\t *\n\t * @private\n\t */\n\t_removeDomSelection() {\n\t\tfor ( const doc of this.domDocuments ) {\n\t\t\tconst domSelection = doc.getSelection();\n\n\t\t\tif ( domSelection.rangeCount ) {\n\t\t\t\tconst activeDomElement = doc.activeElement;\n\t\t\t\tconst viewElement = this.domConverter.mapDomToView( activeDomElement );\n\n\t\t\t\tif ( activeDomElement && viewElement ) {\n\t\t\t\t\tdoc.getSelection().removeAllRanges();\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\t}\n\n\t/**\n\t * Removes the fake selection.\n\t *\n\t * @private\n\t */\n\t_removeFakeSelection() {\n\t\tconst container = this._fakeSelectionContainer;\n\n\t\tif ( container ) {\n\t\t\tcontainer.remove();\n\t\t}\n\t}\n\n\t/**\n\t * Checks if focus needs to be updated and possibly updates it.\n\t *\n\t * @private\n\t */\n\t_updateFocus() {\n\t\tif ( this.isFocused ) {\n\t\t\tconst editable = this.selection.editableElement;\n\n\t\t\tif ( editable ) {\n\t\t\t\tthis.domConverter.focus( editable );\n\t\t\t}\n\t\t}\n\t}\n}\n\nmix( Renderer, ObservableMixin );\n\n// Checks if provided element is editable.\n//\n// @private\n// @param {module:engine/view/element~Element} element\n// @returns {Boolean}\nfunction isEditable( element ) {\n\tif ( element.getAttribute( 'contenteditable' ) == 'false' ) {\n\t\treturn false;\n\t}\n\n\tconst parent = element.findAncestor( element => element.hasAttribute( 'contenteditable' ) );\n\n\treturn !parent || parent.getAttribute( 'contenteditable' ) == 'true';\n}\n\n// Adds inline filler at a given position.\n//\n// The position can be given as an array of DOM nodes and an offset in that array,\n// or a DOM parent element and an offset in that element.\n//\n// @private\n// @param {Document} domDocument\n// @param {Element|Array.<Node>} domParentOrArray\n// @param {Number} offset\n// @returns {Text} The DOM text node that contains an inline filler.\nfunction addInlineFiller( domDocument, domParentOrArray, offset ) {\n\tconst childNodes = domParentOrArray instanceof Array ? domParentOrArray : domParentOrArray.childNodes;\n\tconst nodeAfterFiller = childNodes[ offset ];\n\n\tif ( isText( nodeAfterFiller ) ) {\n\t\tnodeAfterFiller.data = INLINE_FILLER + nodeAfterFiller.data;\n\n\t\treturn nodeAfterFiller;\n\t} else {\n\t\tconst fillerNode = domDocument.createTextNode( INLINE_FILLER );\n\n\t\tif ( Array.isArray( domParentOrArray ) ) {\n\t\t\tchildNodes.splice( offset, 0, fillerNode );\n\t\t} else {\n\t\t\tinsertAt( domParentOrArray, offset, fillerNode );\n\t\t}\n\n\t\treturn fillerNode;\n\t}\n}\n\n// Whether two DOM nodes should be considered as similar.\n// Nodes are considered similar if they have the same tag name.\n//\n// @private\n// @param {Node} node1\n// @param {Node} node2\n// @returns {Boolean}\nfunction areSimilar( node1, node2 ) {\n\treturn isNode( node1 ) && isNode( node2 ) &&\n\t\t!isText( node1 ) && !isText( node2 ) &&\n\t\tnode1.nodeType !== Node.COMMENT_NODE && node2.nodeType !== Node.COMMENT_NODE &&\n\t\tnode1.tagName.toLowerCase() === node2.tagName.toLowerCase();\n}\n\n// Whether two dom nodes should be considered as the same.\n// Two nodes which are considered the same are:\n//\n//\t\t* Text nodes with the same text.\n//\t\t* Element nodes represented by the same object.\n//\t\t* Two block filler elements.\n//\n// @private\n// @param {String} blockFillerMode Block filler mode, see {@link module:engine/view/domconverter~DomConverter#blockFillerMode}.\n// @param {Node} node1\n// @param {Node} node2\n// @returns {Boolean}\nfunction sameNodes( domConverter, actualDomChild, expectedDomChild ) {\n\t// Elements.\n\tif ( actualDomChild === expectedDomChild ) {\n\t\treturn true;\n\t}\n\t// Texts.\n\telse if ( isText( actualDomChild ) && isText( expectedDomChild ) ) {\n\t\treturn actualDomChild.data === expectedDomChild.data;\n\t}\n\t// Block fillers.\n\telse if ( domConverter.isBlockFiller( actualDomChild ) &&\n\t\tdomConverter.isBlockFiller( expectedDomChild ) ) {\n\t\treturn true;\n\t}\n\n\t// Not matching types.\n\treturn false;\n}\n\n// The following is a Firefox–specific hack (https://github.com/ckeditor/ckeditor5-engine/issues/1439).\n// When the native DOM selection is at the end of the block and preceded by <br /> e.g.\n//\n//\t\t<p>foo<br/>[]</p>\n//\n// which happens a lot when using the soft line break, the browser fails to (visually) move the\n// caret to the new line. A quick fix is as simple as force–refreshing the selection with the same range.\nfunction fixGeckoSelectionAfterBr( focus, domSelection ) {\n\tconst parent = focus.parent;\n\n\t// This fix works only when the focus point is at the very end of an element.\n\t// There is no point in running it in cases unrelated to the browser bug.\n\tif ( parent.nodeType != Node.ELEMENT_NODE || focus.offset != parent.childNodes.length - 1 ) {\n\t\treturn;\n\t}\n\n\tconst childAtOffset = parent.childNodes[ focus.offset ];\n\n\t// To stay on the safe side, the fix being as specific as possible, it targets only the\n\t// selection which is at the very end of the element and preceded by <br />.\n\tif ( childAtOffset && childAtOffset.tagName == 'BR' ) {\n\t\tdomSelection.addRange( domSelection.getRangeAt( 0 ) );\n\t}\n}\n\nfunction filterOutFakeSelectionContainer( domChildList, fakeSelectionContainer ) {\n\tconst childList = Array.from( domChildList );\n\n\tif ( childList.length == 0 || !fakeSelectionContainer ) {\n\t\treturn childList;\n\t}\n\n\tconst last = childList[ childList.length - 1 ];\n\n\tif ( last == fakeSelectionContainer ) {\n\t\tchildList.pop();\n\t}\n\n\treturn childList;\n}\n\n// Creates a fake selection container for a given document.\n//\n// @private\n// @param {Document} domDocument\n// @returns {HTMLElement}\nfunction createFakeSelectionContainer( domDocument ) {\n\tconst container = domDocument.createElement( 'div' );\n\n\tcontainer.className = 'ck-fake-selection-container';\n\n\tObject.assign( container.style, {\n\t\tposition: 'fixed',\n\t\ttop: 0,\n\t\tleft: '-9999px',\n\t\t// See https://github.com/ckeditor/ckeditor5/issues/752.\n\t\twidth: '42px'\n\t} );\n\n\t// Fill it with a text node so we can update it later.\n\tcontainer.textContent = '\\u00A0';\n\n\treturn container;\n}\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/* globals window, document */\n\n/**\n * @module utils/dom/global\n */\n\n/**\n * A helper (module) giving an access to the global DOM objects such as `window` and\n * `document`. Accessing these objects using this helper allows easy and bulletproof\n * testing, i.e. stubbing native properties:\n *\n *\t\timport global from 'ckeditor5/utils/dom/global.js';\n *\n *\t\t// This stub will work for any code using global module.\n *\t\ttestUtils.sinon.stub( global, 'window', {\n *\t\t\tinnerWidth: 10000\n *\t\t} );\n *\n *\t\tconsole.log( global.window.innerWidth );\n */\nexport default { window, document };\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module utils/dom/indexof\n */\n\n/**\n * Returns index of the node in the parent element.\n *\n * @param {Node} node Node which index is tested.\n * @returns {Number} Index of the node in the parent element. Returns 0 if node has no parent.\n */\nexport default function indexOf( node ) {\n\tlet index = 0;\n\n\twhile ( node.previousSibling ) {\n\t\tnode = node.previousSibling;\n\t\tindex++;\n\t}\n\n\treturn index;\n}\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/* globals Node */\n\n/**\n * @module utils/dom/getancestors\n */\n\n/**\n * Returns all ancestors of given DOM node, starting from the top-most (root). Includes the given node itself. If the\n * node is a part of `DocumentFragment` that `DocumentFragment` will be returned. In contrary, if the node is\n * appended to a `Document`, that `Document` will not be returned (algorithms operating on DOM tree care for `Document#documentElement`\n * at most, which will be returned).\n *\n * @param {Node} node DOM node.\n * @returns {Array.<Node|DocumentFragment>} Array of given `node` parents.\n */\nexport default function getAncestors( node ) {\n\tconst nodes = [];\n\n\t// We are interested in `Node`s `DocumentFragment`s only.\n\twhile ( node && node.nodeType != Node.DOCUMENT_NODE ) {\n\t\tnodes.unshift( node );\n\t\tnode = node.parentNode;\n\t}\n\n\treturn nodes;\n}\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module engine/view/domconverter\n */\n\n/* globals document, Node, NodeFilter, Text */\n\nimport ViewText from './text';\nimport ViewElement from './element';\nimport ViewPosition from './position';\nimport ViewRange from './range';\nimport ViewSelection from './selection';\nimport ViewDocumentFragment from './documentfragment';\nimport ViewTreeWalker from './treewalker';\nimport Matcher from './matcher';\nimport { BR_FILLER, getDataWithoutFiller, INLINE_FILLER_LENGTH, isInlineFiller, NBSP_FILLER, startsWithFiller } from './filler';\n\nimport global from '@ckeditor/ckeditor5-utils/src/dom/global';\nimport indexOf from '@ckeditor/ckeditor5-utils/src/dom/indexof';\nimport getAncestors from '@ckeditor/ckeditor5-utils/src/dom/getancestors';\nimport getCommonAncestor from '@ckeditor/ckeditor5-utils/src/dom/getcommonancestor';\nimport isText from '@ckeditor/ckeditor5-utils/src/dom/istext';\nimport { isElement } from 'lodash-es';\n\n// eslint-disable-next-line new-cap\nconst BR_FILLER_REF = BR_FILLER( document );\n\n/**\n * `DomConverter` is a set of tools to do transformations between DOM nodes and view nodes. It also handles\n * {@link module:engine/view/domconverter~DomConverter#bindElements bindings} between these nodes.\n *\n * An instance of the DOM converter is available under\n * {@link module:engine/view/view~View#domConverter `editor.editing.view.domConverter`}.\n *\n * The DOM converter does not check which nodes should be rendered (use {@link module:engine/view/renderer~Renderer}), does not keep the\n * state of a tree nor keeps the synchronization between the tree view and the DOM tree (use {@link module:engine/view/document~Document}).\n *\n * The DOM converter keeps DOM elements to view element bindings, so when the converter gets destroyed, the bindings are lost.\n * Two converters will keep separate binding maps, so one tree view can be bound with two DOM trees.\n */\nexport default class DomConverter {\n\t/**\n\t * Creates a DOM converter.\n\t *\n\t * @param {module:engine/view/document~Document} document The view document instance.\n\t * @param {Object} options An object with configuration options.\n\t * @param {module:engine/view/filler~BlockFillerMode} [options.blockFillerMode='br'] The type of the block filler to use.\n\t */\n\tconstructor( document, options = {} ) {\n\t\t/**\n\t\t * @readonly\n\t\t * @type {module:engine/view/document~Document}\n\t\t */\n\t\tthis.document = document;\n\n\t\t/**\n\t\t * The mode of a block filler used by the DOM converter.\n\t\t *\n\t\t * @readonly\n\t\t * @member {'br'|'nbsp'} module:engine/view/domconverter~DomConverter#blockFillerMode\n\t\t */\n\t\tthis.blockFillerMode = options.blockFillerMode || 'br';\n\n\t\t/**\n\t\t * Elements which are considered pre-formatted elements.\n\t\t *\n\t\t * @readonly\n\t\t * @member {Array.<String>} module:engine/view/domconverter~DomConverter#preElements\n\t\t */\n\t\tthis.preElements = [ 'pre' ];\n\n\t\t/**\n\t\t * Elements which are considered block elements (and hence should be filled with a\n\t\t * {@link #isBlockFiller block filler}).\n\t\t *\n\t\t * Whether an element is considered a block element also affects handling of trailing whitespaces.\n\t\t *\n\t\t * You can extend this array if you introduce support for block elements which are not yet recognized here.\n\t\t *\n\t\t * @readonly\n\t\t * @member {Array.<String>} module:engine/view/domconverter~DomConverter#blockElements\n\t\t */\n\t\tthis.blockElements = [ 'p', 'div', 'h1', 'h2', 'h3', 'h4', 'h5', 'h6', 'li', 'dd', 'dt', 'figcaption', 'td', 'th' ];\n\n\t\t/**\n\t\t * Block {@link module:engine/view/filler filler} creator, which is used to create all block fillers during the\n\t\t * view-to-DOM conversion and to recognize block fillers during the DOM-to-view conversion.\n\t\t *\n\t\t * @readonly\n\t\t * @private\n\t\t * @member {Function} module:engine/view/domconverter~DomConverter#_blockFiller\n\t\t */\n\t\tthis._blockFiller = this.blockFillerMode == 'br' ? BR_FILLER : NBSP_FILLER;\n\n\t\t/**\n\t\t * The DOM-to-view mapping.\n\t\t *\n\t\t * @private\n\t\t * @member {WeakMap} module:engine/view/domconverter~DomConverter#_domToViewMapping\n\t\t */\n\t\tthis._domToViewMapping = new WeakMap();\n\n\t\t/**\n\t\t * The view-to-DOM mapping.\n\t\t *\n\t\t * @private\n\t\t * @member {WeakMap} module:engine/view/domconverter~DomConverter#_viewToDomMapping\n\t\t */\n\t\tthis._viewToDomMapping = new WeakMap();\n\n\t\t/**\n\t\t * Holds the mapping between fake selection containers and corresponding view selections.\n\t\t *\n\t\t * @private\n\t\t * @member {WeakMap} module:engine/view/domconverter~DomConverter#_fakeSelectionMapping\n\t\t */\n\t\tthis._fakeSelectionMapping = new WeakMap();\n\n\t\t/**\n\t\t * Matcher for view elements whose content should be treated as a raw data\n\t\t * and not processed during conversion from DOM nodes to view elements.\n\t\t *\n\t\t * @private\n\t\t * @type {module:engine/view/matcher~Matcher}\n\t\t */\n\t\tthis._rawContentElementMatcher = new Matcher();\n\n\t\t/**\n\t\t * Set of encountered raw content DOM nodes. It is used for preventing left trimming of the following text node.\n\t\t *\n\t\t * @private\n\t\t * @type {WeakSet.<Node>}\n\t\t */\n\t\tthis._encounteredRawContentDomNodes = new WeakSet();\n\t}\n\n\t/**\n\t * Binds given DOM element that represents fake selection to a **position** of a\n\t * {@link module:engine/view/documentselection~DocumentSelection document selection}.\n\t * Document selection copy is stored and can be retrieved by\n\t * {@link module:engine/view/domconverter~DomConverter#fakeSelectionToView} method.\n\t *\n\t * @param {HTMLElement} domElement\n\t * @param {module:engine/view/documentselection~DocumentSelection} viewDocumentSelection\n\t */\n\tbindFakeSelection( domElement, viewDocumentSelection ) {\n\t\tthis._fakeSelectionMapping.set( domElement, new ViewSelection( viewDocumentSelection ) );\n\t}\n\n\t/**\n\t * Returns {@link module:engine/view/selection~Selection view selection} instance corresponding to\n\t * given DOM element that represents fake selection. Returns `undefined` if binding to given DOM element does not exists.\n\t *\n\t * @param {HTMLElement} domElement\n\t * @returns {module:engine/view/selection~Selection|undefined}\n\t */\n\tfakeSelectionToView( domElement ) {\n\t\treturn this._fakeSelectionMapping.get( domElement );\n\t}\n\n\t/**\n\t * Binds DOM and View elements, so it will be possible to get corresponding elements using\n\t * {@link module:engine/view/domconverter~DomConverter#mapDomToView} and\n\t * {@link module:engine/view/domconverter~DomConverter#mapViewToDom}.\n\t *\n\t * @param {HTMLElement} domElement DOM element to bind.\n\t * @param {module:engine/view/element~Element} viewElement View element to bind.\n\t */\n\tbindElements( domElement, viewElement ) {\n\t\tthis._domToViewMapping.set( domElement, viewElement );\n\t\tthis._viewToDomMapping.set( viewElement, domElement );\n\t}\n\n\t/**\n\t * Unbinds given `domElement` from the view element it was bound to. Unbinding is deep, meaning that all children of\n\t * `domElement` will be unbound too.\n\t *\n\t * @param {HTMLElement} domElement DOM element to unbind.\n\t */\n\tunbindDomElement( domElement ) {\n\t\tconst viewElement = this._domToViewMapping.get( domElement );\n\n\t\tif ( viewElement ) {\n\t\t\tthis._domToViewMapping.delete( domElement );\n\t\t\tthis._viewToDomMapping.delete( viewElement );\n\n\t\t\tfor ( const child of domElement.childNodes ) {\n\t\t\t\tthis.unbindDomElement( child );\n\t\t\t}\n\t\t}\n\t}\n\n\t/**\n\t * Binds DOM and View document fragments, so it will be possible to get corresponding document fragments using\n\t * {@link module:engine/view/domconverter~DomConverter#mapDomToView} and\n\t * {@link module:engine/view/domconverter~DomConverter#mapViewToDom}.\n\t *\n\t * @param {DocumentFragment} domFragment DOM document fragment to bind.\n\t * @param {module:engine/view/documentfragment~DocumentFragment} viewFragment View document fragment to bind.\n\t */\n\tbindDocumentFragments( domFragment, viewFragment ) {\n\t\tthis._domToViewMapping.set( domFragment, viewFragment );\n\t\tthis._viewToDomMapping.set( viewFragment, domFragment );\n\t}\n\n\t/**\n\t * Converts view to DOM. For all text nodes, not bound elements and document fragments new items will\n\t * be created. For bound elements and document fragments function will return corresponding items.\n\t *\n\t * @param {module:engine/view/node~Node|module:engine/view/documentfragment~DocumentFragment} viewNode\n\t * View node or document fragment to transform.\n\t * @param {Document} domDocument Document which will be used to create DOM nodes.\n\t * @param {Object} [options] Conversion options.\n\t * @param {Boolean} [options.bind=false] Determines whether new elements will be bound.\n\t * @param {Boolean} [options.withChildren=true] If `true`, node's and document fragment's children will be converted too.\n\t * @returns {Node|DocumentFragment} Converted node or DocumentFragment.\n\t */\n\tviewToDom( viewNode, domDocument, options = {} ) {\n\t\tif ( viewNode.is( '$text' ) ) {\n\t\t\tconst textData = this._processDataFromViewText( viewNode );\n\n\t\t\treturn domDocument.createTextNode( textData );\n\t\t} else {\n\t\t\tif ( this.mapViewToDom( viewNode ) ) {\n\t\t\t\treturn this.mapViewToDom( viewNode );\n\t\t\t}\n\n\t\t\tlet domElement;\n\n\t\t\tif ( viewNode.is( 'documentFragment' ) ) {\n\t\t\t\t// Create DOM document fragment.\n\t\t\t\tdomElement = domDocument.createDocumentFragment();\n\n\t\t\t\tif ( options.bind ) {\n\t\t\t\t\tthis.bindDocumentFragments( domElement, viewNode );\n\t\t\t\t}\n\t\t\t} else if ( viewNode.is( 'uiElement' ) ) {\n\t\t\t\t// UIElement has its own render() method (see #799).\n\t\t\t\tdomElement = viewNode.render( domDocument );\n\n\t\t\t\tif ( options.bind ) {\n\t\t\t\t\tthis.bindElements( domElement, viewNode );\n\t\t\t\t}\n\n\t\t\t\treturn domElement;\n\t\t\t} else {\n\t\t\t\t// Create DOM element.\n\t\t\t\tif ( viewNode.hasAttribute( 'xmlns' ) ) {\n\t\t\t\t\tdomElement = domDocument.createElementNS( viewNode.getAttribute( 'xmlns' ), viewNode.name );\n\t\t\t\t} else {\n\t\t\t\t\tdomElement = domDocument.createElement( viewNode.name );\n\t\t\t\t}\n\n\t\t\t\t// RawElement take care of their children in RawElement#render() method which can be customized\n\t\t\t\t// (see https://github.com/ckeditor/ckeditor5/issues/4469).\n\t\t\t\tif ( viewNode.is( 'rawElement' ) ) {\n\t\t\t\t\tviewNode.render( domElement );\n\t\t\t\t}\n\n\t\t\t\tif ( options.bind ) {\n\t\t\t\t\tthis.bindElements( domElement, viewNode );\n\t\t\t\t}\n\n\t\t\t\t// Copy element's attributes.\n\t\t\t\tfor ( const key of viewNode.getAttributeKeys() ) {\n\t\t\t\t\tdomElement.setAttribute( key, viewNode.getAttribute( key ) );\n\t\t\t\t}\n\t\t\t}\n\n\t\t\tif ( options.withChildren !== false ) {\n\t\t\t\tfor ( const child of this.viewChildrenToDom( viewNode, domDocument, options ) ) {\n\t\t\t\t\tdomElement.appendChild( child );\n\t\t\t\t}\n\t\t\t}\n\n\t\t\treturn domElement;\n\t\t}\n\t}\n\n\t/**\n\t * Converts children of the view element to DOM using the\n\t * {@link module:engine/view/domconverter~DomConverter#viewToDom} method.\n\t * Additionally, this method adds block {@link module:engine/view/filler filler} to the list of children, if needed.\n\t *\n\t * @param {module:engine/view/element~Element|module:engine/view/documentfragment~DocumentFragment} viewElement Parent view element.\n\t * @param {Document} domDocument Document which will be used to create DOM nodes.\n\t * @param {Object} options See {@link module:engine/view/domconverter~DomConverter#viewToDom} options parameter.\n\t * @returns {Iterable.<Node>} DOM nodes.\n\t */\n\t* viewChildrenToDom( viewElement, domDocument, options = {} ) {\n\t\tconst fillerPositionOffset = viewElement.getFillerOffset && viewElement.getFillerOffset();\n\t\tlet offset = 0;\n\n\t\tfor ( const childView of viewElement.getChildren() ) {\n\t\t\tif ( fillerPositionOffset === offset ) {\n\t\t\t\tyield this._blockFiller( domDocument );\n\t\t\t}\n\n\t\t\tyield this.viewToDom( childView, domDocument, options );\n\n\t\t\toffset++;\n\t\t}\n\n\t\tif ( fillerPositionOffset === offset ) {\n\t\t\tyield this._blockFiller( domDocument );\n\t\t}\n\t}\n\n\t/**\n\t * Converts view {@link module:engine/view/range~Range} to DOM range.\n\t * Inline and block {@link module:engine/view/filler fillers} are handled during the conversion.\n\t *\n\t * @param {module:engine/view/range~Range} viewRange View range.\n\t * @returns {Range} DOM range.\n\t */\n\tviewRangeToDom( viewRange ) {\n\t\tconst domStart = this.viewPositionToDom( viewRange.start );\n\t\tconst domEnd = this.viewPositionToDom( viewRange.end );\n\n\t\tconst domRange = document.createRange();\n\t\tdomRange.setStart( domStart.parent, domStart.offset );\n\t\tdomRange.setEnd( domEnd.parent, domEnd.offset );\n\n\t\treturn domRange;\n\t}\n\n\t/**\n\t * Converts view {@link module:engine/view/position~Position} to DOM parent and offset.\n\t *\n\t * Inline and block {@link module:engine/view/filler fillers} are handled during the conversion.\n\t * If the converted position is directly before inline filler it is moved inside the filler.\n\t *\n\t * @param {module:engine/view/position~Position} viewPosition View position.\n\t * @returns {Object|null} position DOM position or `null` if view position could not be converted to DOM.\n\t * @returns {Node} position.parent DOM position parent.\n\t * @returns {Number} position.offset DOM position offset.\n\t */\n\tviewPositionToDom( viewPosition ) {\n\t\tconst viewParent = viewPosition.parent;\n\n\t\tif ( viewParent.is( '$text' ) ) {\n\t\t\tconst domParent = this.findCorrespondingDomText( viewParent );\n\n\t\t\tif ( !domParent ) {\n\t\t\t\t// Position is in a view text node that has not been rendered to DOM yet.\n\t\t\t\treturn null;\n\t\t\t}\n\n\t\t\tlet offset = viewPosition.offset;\n\n\t\t\tif ( startsWithFiller( domParent ) ) {\n\t\t\t\toffset += INLINE_FILLER_LENGTH;\n\t\t\t}\n\n\t\t\treturn { parent: domParent, offset };\n\t\t} else {\n\t\t\t// viewParent is instance of ViewElement.\n\t\t\tlet domParent, domBefore, domAfter;\n\n\t\t\tif ( viewPosition.offset === 0 ) {\n\t\t\t\tdomParent = this.mapViewToDom( viewParent );\n\n\t\t\t\tif ( !domParent ) {\n\t\t\t\t\t// Position is in a view element that has not been rendered to DOM yet.\n\t\t\t\t\treturn null;\n\t\t\t\t}\n\n\t\t\t\tdomAfter = domParent.childNodes[ 0 ];\n\t\t\t} else {\n\t\t\t\tconst nodeBefore = viewPosition.nodeBefore;\n\n\t\t\t\tdomBefore = nodeBefore.is( '$text' ) ?\n\t\t\t\t\tthis.findCorrespondingDomText( nodeBefore ) :\n\t\t\t\t\tthis.mapViewToDom( viewPosition.nodeBefore );\n\n\t\t\t\tif ( !domBefore ) {\n\t\t\t\t\t// Position is after a view element that has not been rendered to DOM yet.\n\t\t\t\t\treturn null;\n\t\t\t\t}\n\n\t\t\t\tdomParent = domBefore.parentNode;\n\t\t\t\tdomAfter = domBefore.nextSibling;\n\t\t\t}\n\n\t\t\t// If there is an inline filler at position return position inside the filler. We should never return\n\t\t\t// the position before the inline filler.\n\t\t\tif ( isText( domAfter ) && startsWithFiller( domAfter ) ) {\n\t\t\t\treturn { parent: domAfter, offset: INLINE_FILLER_LENGTH };\n\t\t\t}\n\n\t\t\tconst offset = domBefore ? indexOf( domBefore ) + 1 : 0;\n\n\t\t\treturn { parent: domParent, offset };\n\t\t}\n\t}\n\n\t/**\n\t * Converts DOM to view. For all text nodes, not bound elements and document fragments new items will\n\t * be created. For bound elements and document fragments function will return corresponding items. For\n\t * {@link module:engine/view/filler fillers} `null` will be returned.\n\t * For all DOM elements rendered by {@link module:engine/view/uielement~UIElement} that UIElement will be returned.\n\t *\n\t * @param {Node|DocumentFragment} domNode DOM node or document fragment to transform.\n\t * @param {Object} [options] Conversion options.\n\t * @param {Boolean} [options.bind=false] Determines whether new elements will be bound.\n\t * @param {Boolean} [options.withChildren=true] If `true`, node's and document fragment's children will be converted too.\n\t * @param {Boolean} [options.keepOriginalCase=false] If `false`, node's tag name will be converter to lower case.\n\t * @returns {module:engine/view/node~Node|module:engine/view/documentfragment~DocumentFragment|null} Converted node or document fragment\n\t * or `null` if DOM node is a {@link module:engine/view/filler filler} or the given node is an empty text node.\n\t */\n\tdomToView( domNode, options = {} ) {\n\t\tif ( this.isBlockFiller( domNode, this.blockFillerMode ) ) {\n\t\t\treturn null;\n\t\t}\n\n\t\t// When node is inside a UIElement or a RawElement return that parent as it's view representation.\n\t\tconst hostElement = this.getHostViewElement( domNode );\n\n\t\tif ( hostElement ) {\n\t\t\treturn hostElement;\n\t\t}\n\n\t\tif ( isText( domNode ) ) {\n\t\t\tif ( isInlineFiller( domNode ) ) {\n\t\t\t\treturn null;\n\t\t\t} else {\n\t\t\t\tconst textData = this._processDataFromDomText( domNode );\n\n\t\t\t\treturn textData === '' ? null : new ViewText( this.document, textData );\n\t\t\t}\n\t\t} else if ( this.isComment( domNode ) ) {\n\t\t\treturn null;\n\t\t} else {\n\t\t\tif ( this.mapDomToView( domNode ) ) {\n\t\t\t\treturn this.mapDomToView( domNode );\n\t\t\t}\n\n\t\t\tlet viewElement;\n\n\t\t\tif ( this.isDocumentFragment( domNode ) ) {\n\t\t\t\t// Create view document fragment.\n\t\t\t\tviewElement = new ViewDocumentFragment( this.document );\n\n\t\t\t\tif ( options.bind ) {\n\t\t\t\t\tthis.bindDocumentFragments( domNode, viewElement );\n\t\t\t\t}\n\t\t\t} else {\n\t\t\t\t// Create view element.\n\t\t\t\tconst viewName = options.keepOriginalCase ? domNode.tagName : domNode.tagName.toLowerCase();\n\t\t\t\tviewElement = new ViewElement( this.document, viewName );\n\n\t\t\t\tif ( options.bind ) {\n\t\t\t\t\tthis.bindElements( domNode, viewElement );\n\t\t\t\t}\n\n\t\t\t\t// Copy element's attributes.\n\t\t\t\tconst attrs = domNode.attributes;\n\n\t\t\t\tfor ( let i = attrs.length - 1; i >= 0; i-- ) {\n\t\t\t\t\tviewElement._setAttribute( attrs[ i ].name, attrs[ i ].value );\n\t\t\t\t}\n\n\t\t\t\t// Treat this element's content as a raw data if it was registered as such.\n\t\t\t\tif ( options.withChildren !== false && this._rawContentElementMatcher.match( viewElement ) ) {\n\t\t\t\t\tviewElement._setCustomProperty( '$rawContent', domNode.innerHTML );\n\n\t\t\t\t\t// Store a DOM node to prevent left trimming of the following text node.\n\t\t\t\t\tthis._encounteredRawContentDomNodes.add( domNode );\n\n\t\t\t\t\treturn viewElement;\n\t\t\t\t}\n\t\t\t}\n\n\t\t\tif ( options.withChildren !== false ) {\n\t\t\t\tfor ( const child of this.domChildrenToView( domNode, options ) ) {\n\t\t\t\t\tviewElement._appendChild( child );\n\t\t\t\t}\n\t\t\t}\n\n\t\t\treturn viewElement;\n\t\t}\n\t}\n\n\t/**\n\t * Converts children of the DOM element to view nodes using\n\t * the {@link module:engine/view/domconverter~DomConverter#domToView} method.\n\t * Additionally this method omits block {@link module:engine/view/filler filler}, if it exists in the DOM parent.\n\t *\n\t * @param {HTMLElement} domElement Parent DOM element.\n\t * @param {Object} options See {@link module:engine/view/domconverter~DomConverter#domToView} options parameter.\n\t * @returns {Iterable.<module:engine/view/node~Node>} View nodes.\n\t */\n\t* domChildrenToView( domElement, options = {} ) {\n\t\tfor ( let i = 0; i < domElement.childNodes.length; i++ ) {\n\t\t\tconst domChild = domElement.childNodes[ i ];\n\t\t\tconst viewChild = this.domToView( domChild, options );\n\n\t\t\tif ( viewChild !== null ) {\n\t\t\t\tyield viewChild;\n\t\t\t}\n\t\t}\n\t}\n\n\t/**\n\t * Converts DOM selection to view {@link module:engine/view/selection~Selection}.\n\t * Ranges which cannot be converted will be omitted.\n\t *\n\t * @param {Selection} domSelection DOM selection.\n\t * @returns {module:engine/view/selection~Selection} View selection.\n\t */\n\tdomSelectionToView( domSelection ) {\n\t\t// DOM selection might be placed in fake selection container.\n\t\t// If container contains fake selection - return corresponding view selection.\n\t\tif ( domSelection.rangeCount === 1 ) {\n\t\t\tlet container = domSelection.getRangeAt( 0 ).startContainer;\n\n\t\t\t// The DOM selection might be moved to the text node inside the fake selection container.\n\t\t\tif ( isText( container ) ) {\n\t\t\t\tcontainer = container.parentNode;\n\t\t\t}\n\n\t\t\tconst viewSelection = this.fakeSelectionToView( container );\n\n\t\t\tif ( viewSelection ) {\n\t\t\t\treturn viewSelection;\n\t\t\t}\n\t\t}\n\n\t\tconst isBackward = this.isDomSelectionBackward( domSelection );\n\n\t\tconst viewRanges = [];\n\n\t\tfor ( let i = 0; i < domSelection.rangeCount; i++ ) {\n\t\t\t// DOM Range have correct start and end, no matter what is the DOM Selection direction. So we don't have to fix anything.\n\t\t\tconst domRange = domSelection.getRangeAt( i );\n\t\t\tconst viewRange = this.domRangeToView( domRange );\n\n\t\t\tif ( viewRange ) {\n\t\t\t\tviewRanges.push( viewRange );\n\t\t\t}\n\t\t}\n\n\t\treturn new ViewSelection( viewRanges, { backward: isBackward } );\n\t}\n\n\t/**\n\t * Converts DOM Range to view {@link module:engine/view/range~Range}.\n\t * If the start or end position can not be converted `null` is returned.\n\t *\n\t * @param {Range} domRange DOM range.\n\t * @returns {module:engine/view/range~Range|null} View range.\n\t */\n\tdomRangeToView( domRange ) {\n\t\tconst viewStart = this.domPositionToView( domRange.startContainer, domRange.startOffset );\n\t\tconst viewEnd = this.domPositionToView( domRange.endContainer, domRange.endOffset );\n\n\t\tif ( viewStart && viewEnd ) {\n\t\t\treturn new ViewRange( viewStart, viewEnd );\n\t\t}\n\n\t\treturn null;\n\t}\n\n\t/**\n\t * Converts DOM parent and offset to view {@link module:engine/view/position~Position}.\n\t *\n\t * If the position is inside a {@link module:engine/view/filler filler} which has no corresponding view node,\n\t * position of the filler will be converted and returned.\n\t *\n\t * If the position is inside DOM element rendered by {@link module:engine/view/uielement~UIElement}\n\t * that position will be converted to view position before that UIElement.\n\t *\n\t * If structures are too different and it is not possible to find corresponding position then `null` will be returned.\n\t *\n\t * @param {Node} domParent DOM position parent.\n\t * @param {Number} domOffset DOM position offset.\n\t * @returns {module:engine/view/position~Position} viewPosition View position.\n\t */\n\tdomPositionToView( domParent, domOffset ) {\n\t\tif ( this.isBlockFiller( domParent, this.blockFillerMode ) ) {\n\t\t\treturn this.domPositionToView( domParent.parentNode, indexOf( domParent ) );\n\t\t}\n\n\t\t// If position is somewhere inside UIElement or a RawElement - return position before that element.\n\t\tconst viewElement = this.mapDomToView( domParent );\n\n\t\tif ( viewElement && ( viewElement.is( 'uiElement' ) || viewElement.is( 'rawElement' ) ) ) {\n\t\t\treturn ViewPosition._createBefore( viewElement );\n\t\t}\n\n\t\tif ( isText( domParent ) ) {\n\t\t\tif ( isInlineFiller( domParent ) ) {\n\t\t\t\treturn this.domPositionToView( domParent.parentNode, indexOf( domParent ) );\n\t\t\t}\n\n\t\t\tconst viewParent = this.findCorrespondingViewText( domParent );\n\t\t\tlet offset = domOffset;\n\n\t\t\tif ( !viewParent ) {\n\t\t\t\treturn null;\n\t\t\t}\n\n\t\t\tif ( startsWithFiller( domParent ) ) {\n\t\t\t\toffset -= INLINE_FILLER_LENGTH;\n\t\t\t\toffset = offset < 0 ? 0 : offset;\n\t\t\t}\n\n\t\t\treturn new ViewPosition( viewParent, offset );\n\t\t}\n\t\t// domParent instanceof HTMLElement.\n\t\telse {\n\t\t\tif ( domOffset === 0 ) {\n\t\t\t\tconst viewParent = this.mapDomToView( domParent );\n\n\t\t\t\tif ( viewParent ) {\n\t\t\t\t\treturn new ViewPosition( viewParent, 0 );\n\t\t\t\t}\n\t\t\t} else {\n\t\t\t\tconst domBefore = domParent.childNodes[ domOffset - 1 ];\n\t\t\t\tconst viewBefore = isText( domBefore ) ?\n\t\t\t\t\tthis.findCorrespondingViewText( domBefore ) :\n\t\t\t\t\tthis.mapDomToView( domBefore );\n\n\t\t\t\t// TODO #663\n\t\t\t\tif ( viewBefore && viewBefore.parent ) {\n\t\t\t\t\treturn new ViewPosition( viewBefore.parent, viewBefore.index + 1 );\n\t\t\t\t}\n\t\t\t}\n\n\t\t\treturn null;\n\t\t}\n\t}\n\n\t/**\n\t * Returns corresponding view {@link module:engine/view/element~Element Element} or\n\t * {@link module:engine/view/documentfragment~DocumentFragment} for provided DOM element or\n\t * document fragment. If there is no view item {@link module:engine/view/domconverter~DomConverter#bindElements bound}\n\t * to the given DOM - `undefined` is returned.\n\t *\n\t * For all DOM elements rendered by a {@link module:engine/view/uielement~UIElement} or\n\t * a {@link module:engine/view/rawelement~RawElement}, the parent `UIElement` or `RawElement` will be returned.\n\t *\n\t * @param {DocumentFragment|Element} domElementOrDocumentFragment DOM element or document fragment.\n\t * @returns {module:engine/view/element~Element|module:engine/view/documentfragment~DocumentFragment|undefined}\n\t * Corresponding view element, document fragment or `undefined` if no element was bound.\n\t */\n\tmapDomToView( domElementOrDocumentFragment ) {\n\t\tconst hostElement = this.getHostViewElement( domElementOrDocumentFragment );\n\n\t\treturn hostElement || this._domToViewMapping.get( domElementOrDocumentFragment );\n\t}\n\n\t/**\n\t * Finds corresponding text node. Text nodes are not {@link module:engine/view/domconverter~DomConverter#bindElements bound},\n\t * corresponding text node is returned based on the sibling or parent.\n\t *\n\t * If the directly previous sibling is a {@link module:engine/view/domconverter~DomConverter#bindElements bound} element, it is used\n\t * to find the corresponding text node.\n\t *\n\t * If this is a first child in the parent and the parent is a {@link module:engine/view/domconverter~DomConverter#bindElements bound}\n\t * element, it is used to find the corresponding text node.\n\t *\n\t * For all text nodes rendered by a {@link module:engine/view/uielement~UIElement} or\n\t * a {@link module:engine/view/rawelement~RawElement}, the parent `UIElement` or `RawElement` will be returned.\n\t *\n\t * Otherwise `null` is returned.\n\t *\n\t * Note that for the block or inline {@link module:engine/view/filler filler} this method returns `null`.\n\t *\n\t * @param {Text} domText DOM text node.\n\t * @returns {module:engine/view/text~Text|null} Corresponding view text node or `null`, if it was not possible to find a\n\t * corresponding node.\n\t */\n\tfindCorrespondingViewText( domText ) {\n\t\tif ( isInlineFiller( domText ) ) {\n\t\t\treturn null;\n\t\t}\n\n\t\t// If DOM text was rendered by a UIElement or a RawElement - return this parent element.\n\t\tconst hostElement = this.getHostViewElement( domText );\n\n\t\tif ( hostElement ) {\n\t\t\treturn hostElement;\n\t\t}\n\n\t\tconst previousSibling = domText.previousSibling;\n\n\t\t// Try to use previous sibling to find the corresponding text node.\n\t\tif ( previousSibling ) {\n\t\t\tif ( !( this.isElement( previousSibling ) ) ) {\n\t\t\t\t// The previous is text or comment.\n\t\t\t\treturn null;\n\t\t\t}\n\n\t\t\tconst viewElement = this.mapDomToView( previousSibling );\n\n\t\t\tif ( viewElement ) {\n\t\t\t\tconst nextSibling = viewElement.nextSibling;\n\n\t\t\t\t// It might be filler which has no corresponding view node.\n\t\t\t\tif ( nextSibling instanceof ViewText ) {\n\t\t\t\t\treturn viewElement.nextSibling;\n\t\t\t\t} else {\n\t\t\t\t\treturn null;\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\t\t// Try to use parent to find the corresponding text node.\n\t\telse {\n\t\t\tconst viewElement = this.mapDomToView( domText.parentNode );\n\n\t\t\tif ( viewElement ) {\n\t\t\t\tconst firstChild = viewElement.getChild( 0 );\n\n\t\t\t\t// It might be filler which has no corresponding view node.\n\t\t\t\tif ( firstChild instanceof ViewText ) {\n\t\t\t\t\treturn firstChild;\n\t\t\t\t} else {\n\t\t\t\t\treturn null;\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\n\t\treturn null;\n\t}\n\n\t/**\n\t * Returns corresponding DOM item for provided {@link module:engine/view/element~Element Element} or\n\t * {@link module:engine/view/documentfragment~DocumentFragment DocumentFragment}.\n\t * To find a corresponding text for {@link module:engine/view/text~Text view Text instance}\n\t * use {@link #findCorrespondingDomText}.\n\t *\n\t * @param {module:engine/view/element~Element|module:engine/view/documentfragment~DocumentFragment} viewNode\n\t * View element or document fragment.\n\t * @returns {Node|DocumentFragment|undefined} Corresponding DOM node or document fragment.\n\t */\n\tmapViewToDom( documentFragmentOrElement ) {\n\t\treturn this._viewToDomMapping.get( documentFragmentOrElement );\n\t}\n\n\t/**\n\t * Finds corresponding text node. Text nodes are not {@link module:engine/view/domconverter~DomConverter#bindElements bound},\n\t * corresponding text node is returned based on the sibling or parent.\n\t *\n\t * If the directly previous sibling is a {@link module:engine/view/domconverter~DomConverter#bindElements bound} element, it is used\n\t * to find the corresponding text node.\n\t *\n\t * If this is a first child in the parent and the parent is a {@link module:engine/view/domconverter~DomConverter#bindElements bound}\n\t * element, it is used to find the corresponding text node.\n\t *\n\t * Otherwise `null` is returned.\n\t *\n\t * @param {module:engine/view/text~Text} viewText View text node.\n\t * @returns {Text|null} Corresponding DOM text node or `null`, if it was not possible to find a corresponding node.\n\t */\n\tfindCorrespondingDomText( viewText ) {\n\t\tconst previousSibling = viewText.previousSibling;\n\n\t\t// Try to use previous sibling to find the corresponding text node.\n\t\tif ( previousSibling && this.mapViewToDom( previousSibling ) ) {\n\t\t\treturn this.mapViewToDom( previousSibling ).nextSibling;\n\t\t}\n\n\t\t// If this is a first node, try to use parent to find the corresponding text node.\n\t\tif ( !previousSibling && viewText.parent && this.mapViewToDom( viewText.parent ) ) {\n\t\t\treturn this.mapViewToDom( viewText.parent ).childNodes[ 0 ];\n\t\t}\n\n\t\treturn null;\n\t}\n\n\t/**\n\t * Focuses DOM editable that is corresponding to provided {@link module:engine/view/editableelement~EditableElement}.\n\t *\n\t * @param {module:engine/view/editableelement~EditableElement} viewEditable\n\t */\n\tfocus( viewEditable ) {\n\t\tconst domEditable = this.mapViewToDom( viewEditable );\n\n\t\tif ( domEditable && domEditable.ownerDocument.activeElement !== domEditable ) {\n\t\t\t// Save the scrollX and scrollY positions before the focus.\n\t\t\tconst { scrollX, scrollY } = global.window;\n\t\t\tconst scrollPositions = [];\n\n\t\t\t// Save all scrollLeft and scrollTop values starting from domEditable up to\n\t\t\t// document#documentElement.\n\t\t\tforEachDomNodeAncestor( domEditable, node => {\n\t\t\t\tconst { scrollLeft, scrollTop } = node;\n\n\t\t\t\tscrollPositions.push( [ scrollLeft, scrollTop ] );\n\t\t\t} );\n\n\t\t\tdomEditable.focus();\n\n\t\t\t// Restore scrollLeft and scrollTop values starting from domEditable up to\n\t\t\t// document#documentElement.\n\t\t\t// https://github.com/ckeditor/ckeditor5-engine/issues/951\n\t\t\t// https://github.com/ckeditor/ckeditor5-engine/issues/957\n\t\t\tforEachDomNodeAncestor( domEditable, node => {\n\t\t\t\tconst [ scrollLeft, scrollTop ] = scrollPositions.shift();\n\n\t\t\t\tnode.scrollLeft = scrollLeft;\n\t\t\t\tnode.scrollTop = scrollTop;\n\t\t\t} );\n\n\t\t\t// Restore the scrollX and scrollY positions after the focus.\n\t\t\t// https://github.com/ckeditor/ckeditor5-engine/issues/951\n\t\t\tglobal.window.scrollTo( scrollX, scrollY );\n\t\t}\n\t}\n\n\t/**\n\t * Returns `true` when `node.nodeType` equals `Node.ELEMENT_NODE`.\n\t *\n\t * @param {Node} node Node to check.\n\t * @returns {Boolean}\n\t */\n\tisElement( node ) {\n\t\treturn node && node.nodeType == Node.ELEMENT_NODE;\n\t}\n\n\t/**\n\t * Returns `true` when `node.nodeType` equals `Node.DOCUMENT_FRAGMENT_NODE`.\n\t *\n\t * @param {Node} node Node to check.\n\t * @returns {Boolean}\n\t */\n\tisDocumentFragment( node ) {\n\t\treturn node && node.nodeType == Node.DOCUMENT_FRAGMENT_NODE;\n\t}\n\n\t/**\n\t * Returns `true` when `node.nodeType` equals `Node.COMMENT_NODE`.\n\t *\n\t * @param {Node} node Node to check.\n\t * @returns {Boolean}\n\t */\n\tisComment( node ) {\n\t\treturn node && node.nodeType == Node.COMMENT_NODE;\n\t}\n\n\t/**\n\t * Checks if the node is an instance of the block filler for this DOM converter.\n\t *\n\t *\t\tconst converter = new DomConverter( viewDocument, { blockFillerMode: 'br' } );\n\t *\n\t *\t\tconverter.isBlockFiller( BR_FILLER( document ) ); // true\n\t *\t\tconverter.isBlockFiller( NBSP_FILLER( document ) ); // false\n\t *\n\t * **Note:**: For the `'nbsp'` mode the method also checks context of a node so it cannot be a detached node.\n\t *\n\t * **Note:** A special case in the `'nbsp'` mode exists where the `<br>` in `<p><br></p>` is treated as a block filler.\n\t *\n\t * @param {Node} domNode DOM node to check.\n\t * @returns {Boolean} True if a node is considered a block filler for given mode.\n\t */\n\tisBlockFiller( domNode ) {\n\t\tif ( this.blockFillerMode == 'br' ) {\n\t\t\treturn domNode.isEqualNode( BR_FILLER_REF );\n\t\t}\n\n\t\t// Special case for <p><br></p> in which case the <br> should be treated as filler even\n\t\t// when we're in the 'nbsp' mode. See ckeditor5#5564.\n\t\tif ( domNode.tagName === 'BR' && hasBlockParent( domNode, this.blockElements ) && domNode.parentNode.childNodes.length === 1 ) {\n\t\t\treturn true;\n\t\t}\n\n\t\treturn isNbspBlockFiller( domNode, this.blockElements );\n\t}\n\n\t/**\n\t * Returns `true` if given selection is a backward selection, that is, if it's `focus` is before `anchor`.\n\t *\n\t * @param {Selection} DOM Selection instance to check.\n\t * @returns {Boolean}\n\t */\n\tisDomSelectionBackward( selection ) {\n\t\tif ( selection.isCollapsed ) {\n\t\t\treturn false;\n\t\t}\n\n\t\t// Since it takes multiple lines of code to check whether a \"DOM Position\" is before/after another \"DOM Position\",\n\t\t// we will use the fact that range will collapse if it's end is before it's start.\n\t\tconst range = document.createRange();\n\n\t\trange.setStart( selection.anchorNode, selection.anchorOffset );\n\t\trange.setEnd( selection.focusNode, selection.focusOffset );\n\n\t\tconst backward = range.collapsed;\n\n\t\trange.detach();\n\n\t\treturn backward;\n\t}\n\n\t/**\n\t * Returns a parent {@link module:engine/view/uielement~UIElement} or {@link module:engine/view/rawelement~RawElement}\n\t * that hosts the provided DOM node. Returns `null` if there is no such parent.\n\t *\n\t * @param {Node} domNode\n\t * @returns {module:engine/view/uielement~UIElement|module:engine/view/rawelement~RawElement|null}\n\t */\n\tgetHostViewElement( domNode ) {\n\t\tconst ancestors = getAncestors( domNode );\n\n\t\t// Remove domNode from the list.\n\t\tancestors.pop();\n\n\t\twhile ( ancestors.length ) {\n\t\t\tconst domNode = ancestors.pop();\n\t\t\tconst viewNode = this._domToViewMapping.get( domNode );\n\n\t\t\tif ( viewNode && ( viewNode.is( 'uiElement' ) || viewNode.is( 'rawElement' ) ) ) {\n\t\t\t\treturn viewNode;\n\t\t\t}\n\t\t}\n\n\t\treturn null;\n\t}\n\n\t/**\n\t * Checks if the given selection's boundaries are at correct places.\n\t *\n\t * The following places are considered as incorrect for selection boundaries:\n\t *\n\t * * before or in the middle of an inline filler sequence,\n\t * * inside a DOM element which represents {@link module:engine/view/uielement~UIElement a view UI element},\n\t * * inside a DOM element which represents {@link module:engine/view/rawelement~RawElement a view raw element}.\n\t *\n\t * @param {Selection} domSelection The DOM selection object to be checked.\n\t * @returns {Boolean} `true` if the given selection is at a correct place, `false` otherwise.\n\t */\n\tisDomSelectionCorrect( domSelection ) {\n\t\treturn this._isDomSelectionPositionCorrect( domSelection.anchorNode, domSelection.anchorOffset ) &&\n\t\t\tthis._isDomSelectionPositionCorrect( domSelection.focusNode, domSelection.focusOffset );\n\t}\n\n\t/**\n\t * Registers a {@link module:engine/view/matcher~MatcherPattern} for view elements whose content should be treated as a raw data\n\t * and not processed during conversion from DOM nodes to view elements.\n\t *\n\t * This is affecting how {@link module:engine/view/domconverter~DomConverter#domToView} and\n\t * {@link module:engine/view/domconverter~DomConverter#domChildrenToView} processes DOM nodes.\n\t *\n\t * The raw data can be later accessed by {@link module:engine/view/element~Element#getCustomProperty view element custom property}\n\t * `\"$rawContent\"`.\n\t *\n\t * @param {module:engine/view/matcher~MatcherPattern} pattern Pattern matching view element which content should\n\t * be treated as a raw data.\n\t */\n\tregisterRawContentMatcher( pattern ) {\n\t\tthis._rawContentElementMatcher.add( pattern );\n\t}\n\n\t/**\n\t * Checks if the given DOM position is a correct place for selection boundary. See {@link #isDomSelectionCorrect}.\n\t *\n\t * @private\n\t * @param {Element} domParent Position parent.\n\t * @param {Number} offset Position offset.\n\t * @returns {Boolean} `true` if given position is at a correct place for selection boundary, `false` otherwise.\n\t */\n\t_isDomSelectionPositionCorrect( domParent, offset ) {\n\t\t// If selection is before or in the middle of inline filler string, it is incorrect.\n\t\tif ( isText( domParent ) && startsWithFiller( domParent ) && offset < INLINE_FILLER_LENGTH ) {\n\t\t\t// Selection in a text node, at wrong position (before or in the middle of filler).\n\t\t\treturn false;\n\t\t}\n\n\t\tif ( this.isElement( domParent ) && startsWithFiller( domParent.childNodes[ offset ] ) ) {\n\t\t\t// Selection in an element node, before filler text node.\n\t\t\treturn false;\n\t\t}\n\n\t\tconst viewParent = this.mapDomToView( domParent );\n\n\t\t// The position is incorrect when anchored inside a UIElement or a RawElement.\n\t\t// Note: In case of UIElement and RawElement, mapDomToView() returns a parent element for any DOM child\n\t\t// so there's no need to perform any additional checks.\n\t\tif ( viewParent && ( viewParent.is( 'uiElement' ) || viewParent.is( 'rawElement' ) ) ) {\n\t\t\treturn false;\n\t\t}\n\n\t\treturn true;\n\t}\n\n\t/**\n\t * Takes text data from a given {@link module:engine/view/text~Text#data} and processes it so\n\t * it is correctly displayed in the DOM.\n\t *\n\t * Following changes are done:\n\t *\n\t * * a space at the beginning is changed to `&nbsp;` if this is the first text node in its container\n\t * element or if a previous text node ends with a space character,\n\t * * space at the end of the text node is changed to `&nbsp;` if there are two spaces at the end of a node or if next node\n\t * starts with a space or if it is the last text node in its container,\n\t * * remaining spaces are replaced to a chain of spaces and `&nbsp;` (e.g. `'x   x'` becomes `'x &nbsp; x'`).\n\t *\n\t * Content of {@link #preElements} is not processed.\n\t *\n\t * @private\n\t * @param {module:engine/view/text~Text} node View text node to process.\n\t * @returns {String} Processed text data.\n\t */\n\t_processDataFromViewText( node ) {\n\t\tlet data = node.data;\n\n\t\t// If any of node ancestors has a name which is in `preElements` array, then currently processed\n\t\t// view text node is (will be) in preformatted element. We should not change whitespaces then.\n\t\tif ( node.getAncestors().some( parent => this.preElements.includes( parent.name ) ) ) {\n\t\t\treturn data;\n\t\t}\n\n\t\t// 1. Replace the first space with a nbsp if the previous node ends with a space or there is no previous node\n\t\t// (container element boundary).\n\t\tif ( data.charAt( 0 ) == ' ' ) {\n\t\t\tconst prevNode = this._getTouchingViewTextNode( node, false );\n\t\t\tconst prevEndsWithSpace = prevNode && this._nodeEndsWithSpace( prevNode );\n\n\t\t\tif ( prevEndsWithSpace || !prevNode ) {\n\t\t\t\tdata = '\\u00A0' + data.substr( 1 );\n\t\t\t}\n\t\t}\n\n\t\t// 2. Replace the last space with nbsp if there are two spaces at the end or if the next node starts with space or there is no\n\t\t// next node (container element boundary).\n\t\t//\n\t\t// Keep in mind that Firefox prefers $nbsp; before tag, not inside it:\n\t\t//\n\t\t// Foo <span>&nbsp;bar</span>  <-- bad.\n\t\t// Foo&nbsp;<span> bar</span>  <-- good.\n\t\t//\n\t\t// More here: https://github.com/ckeditor/ckeditor5-engine/issues/1747.\n\t\tif ( data.charAt( data.length - 1 ) == ' ' ) {\n\t\t\tconst nextNode = this._getTouchingViewTextNode( node, true );\n\n\t\t\tif ( data.charAt( data.length - 2 ) == ' ' || !nextNode || nextNode.data.charAt( 0 ) == ' ' ) {\n\t\t\t\tdata = data.substr( 0, data.length - 1 ) + '\\u00A0';\n\t\t\t}\n\t\t}\n\n\t\t// 3. Create space+nbsp pairs.\n\t\treturn data.replace( / {2}/g, ' \\u00A0' );\n\t}\n\n\t/**\n\t * Checks whether given node ends with a space character after changing appropriate space characters to `&nbsp;`s.\n\t *\n\t * @private\n\t * @param {module:engine/view/text~Text} node Node to check.\n\t * @returns {Boolean} `true` if given `node` ends with space, `false` otherwise.\n\t */\n\t_nodeEndsWithSpace( node ) {\n\t\tif ( node.getAncestors().some( parent => this.preElements.includes( parent.name ) ) ) {\n\t\t\treturn false;\n\t\t}\n\n\t\tconst data = this._processDataFromViewText( node );\n\n\t\treturn data.charAt( data.length - 1 ) == ' ';\n\t}\n\n\t/**\n\t * Takes text data from native `Text` node and processes it to a correct {@link module:engine/view/text~Text view text node} data.\n\t *\n\t * Following changes are done:\n\t *\n\t * * multiple whitespaces are replaced to a single space,\n\t * * space at the beginning of a text node is removed if it is the first text node in its container\n\t * element or if the previous text node ends with a space character,\n\t * * space at the end of the text node is removed if there are two spaces at the end of a node or if next node\n\t * starts with a space or if it is the last text node in its container\n\t * * nbsps are converted to spaces.\n\t *\n\t * @param {Node} node DOM text node to process.\n\t * @returns {String} Processed data.\n\t * @private\n\t */\n\t_processDataFromDomText( node ) {\n\t\tlet data = node.data;\n\n\t\tif ( _hasDomParentOfType( node, this.preElements ) ) {\n\t\t\treturn getDataWithoutFiller( node );\n\t\t}\n\n\t\t// Change all consecutive whitespace characters (from the [ \\n\\t\\r] set –\n\t\t// see https://github.com/ckeditor/ckeditor5-engine/issues/822#issuecomment-311670249) to a single space character.\n\t\t// That's how multiple whitespaces are treated when rendered, so we normalize those whitespaces.\n\t\t// We're replacing 1+ (and not 2+) to also normalize singular \\n\\t\\r characters (#822).\n\t\tdata = data.replace( /[ \\n\\t\\r]{1,}/g, ' ' );\n\n\t\tconst prevNode = this._getTouchingInlineDomNode( node, false );\n\t\tconst nextNode = this._getTouchingInlineDomNode( node, true );\n\n\t\tconst shouldLeftTrim = this._checkShouldLeftTrimDomText( node, prevNode );\n\t\tconst shouldRightTrim = this._checkShouldRightTrimDomText( node, nextNode );\n\n\t\t// If the previous dom text node does not exist or it ends by whitespace character, remove space character from the beginning\n\t\t// of this text node. Such space character is treated as a whitespace.\n\t\tif ( shouldLeftTrim ) {\n\t\t\tdata = data.replace( /^ /, '' );\n\t\t}\n\n\t\t// If the next text node does not exist remove space character from the end of this text node.\n\t\tif ( shouldRightTrim ) {\n\t\t\tdata = data.replace( / $/, '' );\n\t\t}\n\n\t\t// At the beginning and end of a block element, Firefox inserts normal space + <br> instead of non-breaking space.\n\t\t// This means that the text node starts/end with normal space instead of non-breaking space.\n\t\t// This causes a problem because the normal space would be removed in `.replace` calls above. To prevent that,\n\t\t// the inline filler is removed only after the data is initially processed (by the `.replace` above). See ckeditor5#692.\n\t\tdata = getDataWithoutFiller( new Text( data ) );\n\n\t\t// At this point we should have removed all whitespaces from DOM text data.\n\t\t//\n\t\t// Now, We will reverse the process that happens in `_processDataFromViewText`.\n\t\t//\n\t\t// We have to change &nbsp; chars, that were in DOM text data because of rendering reasons, to spaces.\n\t\t// First, change all ` \\u00A0` pairs (space + &nbsp;) to two spaces. DOM converter changes two spaces from model/view to\n\t\t// ` \\u00A0` to ensure proper rendering. Since here we convert back, we recognize those pairs and change them back to `  `.\n\t\tdata = data.replace( / \\u00A0/g, '  ' );\n\n\t\t// Then, let's change the last nbsp to a space.\n\t\tif ( /( |\\u00A0)\\u00A0$/.test( data ) || !nextNode || ( nextNode.data && nextNode.data.charAt( 0 ) == ' ' ) ) {\n\t\t\tdata = data.replace( /\\u00A0$/, ' ' );\n\t\t}\n\n\t\t// Then, change &nbsp; character that is at the beginning of the text node to space character.\n\t\t// We do that replacement only if this is the first node or the previous node ends on whitespace character.\n\t\tif ( shouldLeftTrim ) {\n\t\t\tdata = data.replace( /^\\u00A0/, ' ' );\n\t\t}\n\n\t\t// At this point, all whitespaces should be removed and all &nbsp; created for rendering reasons should be\n\t\t// changed to normal space. All left &nbsp; are &nbsp; inserted intentionally.\n\t\treturn data;\n\t}\n\n\t/**\n\t * Helper function which checks if a DOM text node, preceded by the given `prevNode` should\n\t * be trimmed from the left side.\n\t *\n\t * @private\n\t * @param {Node} node\n\t * @param {Node} prevNode\n\t */\n\t_checkShouldLeftTrimDomText( node, prevNode ) {\n\t\tif ( !prevNode ) {\n\t\t\treturn true;\n\t\t}\n\n\t\tif ( isElement( prevNode ) ) {\n\t\t\treturn true;\n\t\t}\n\n\t\t// Shouldn't left trim if previous node is a node that was encountered as a raw content node.\n\t\tif ( this._encounteredRawContentDomNodes.has( node.previousSibling ) ) {\n\t\t\treturn false;\n\t\t}\n\n\t\treturn /[^\\S\\u00A0]/.test( prevNode.data.charAt( prevNode.data.length - 1 ) );\n\t}\n\n\t/**\n\t * Helper function which checks if a DOM text node, succeeded by the given `nextNode` should\n\t * be trimmed from the right side.\n\t *\n\t * @private\n\t * @param {Node} node\n\t * @param {Node} nextNode\n\t */\n\t_checkShouldRightTrimDomText( node, nextNode ) {\n\t\tif ( nextNode ) {\n\t\t\treturn false;\n\t\t}\n\n\t\treturn !startsWithFiller( node );\n\t}\n\n\t/**\n\t * Helper function. For given {@link module:engine/view/text~Text view text node}, it finds previous or next sibling\n\t * that is contained in the same container element. If there is no such sibling, `null` is returned.\n\t *\n\t * @private\n\t * @param {module:engine/view/text~Text} node Reference node.\n\t * @param {Boolean} getNext\n\t * @returns {module:engine/view/text~Text|null} Touching text node or `null` if there is no next or previous touching text node.\n\t */\n\t_getTouchingViewTextNode( node, getNext ) {\n\t\tconst treeWalker = new ViewTreeWalker( {\n\t\t\tstartPosition: getNext ? ViewPosition._createAfter( node ) : ViewPosition._createBefore( node ),\n\t\t\tdirection: getNext ? 'forward' : 'backward'\n\t\t} );\n\n\t\tfor ( const value of treeWalker ) {\n\t\t\t// ViewContainerElement is found on a way to next ViewText node, so given `node` was first/last\n\t\t\t// text node in its container element.\n\t\t\tif ( value.item.is( 'containerElement' ) ) {\n\t\t\t\treturn null;\n\t\t\t}\n\t\t\t// <br> found – it works like a block boundary, so do not scan further.\n\t\t\telse if ( value.item.is( 'element', 'br' ) ) {\n\t\t\t\treturn null;\n\t\t\t}\n\t\t\t// Found a text node in the same container element.\n\t\t\telse if ( value.item.is( '$textProxy' ) ) {\n\t\t\t\treturn value.item;\n\t\t\t}\n\t\t}\n\n\t\treturn null;\n\t}\n\n\t/**\n\t * Helper function. For the given text node, it finds the closest touching node which is either\n\t * a text node or a `<br>`. The search is terminated at block element boundaries and if a matching node\n\t * wasn't found so far, `null` is returned.\n\t *\n\t * In the following DOM structure:\n\t *\n\t *\t\t<p>foo<b>bar</b><br>bom</p>\n\t *\n\t * * `foo` doesn't have its previous touching inline node (`null` is returned),\n\t * * `foo`'s next touching inline node is `bar`\n\t * * `bar`'s next touching inline node is `<br>`\n\t *\n\t * This method returns text nodes and `<br>` elements because these types of nodes affect how\n\t * spaces in the given text node need to be converted.\n\t *\n\t * @private\n\t * @param {Text} node\n\t * @param {Boolean} getNext\n\t * @returns {Text|Element|null}\n\t */\n\t_getTouchingInlineDomNode( node, getNext ) {\n\t\tif ( !node.parentNode ) {\n\t\t\treturn null;\n\t\t}\n\n\t\tconst direction = getNext ? 'nextNode' : 'previousNode';\n\t\tconst document = node.ownerDocument;\n\t\tconst topmostParent = getAncestors( node )[ 0 ];\n\n\t\tconst treeWalker = document.createTreeWalker( topmostParent, NodeFilter.SHOW_TEXT | NodeFilter.SHOW_ELEMENT, {\n\t\t\tacceptNode( node ) {\n\t\t\t\tif ( isText( node ) ) {\n\t\t\t\t\treturn NodeFilter.FILTER_ACCEPT;\n\t\t\t\t}\n\n\t\t\t\tif ( node.tagName == 'BR' ) {\n\t\t\t\t\treturn NodeFilter.FILTER_ACCEPT;\n\t\t\t\t}\n\n\t\t\t\treturn NodeFilter.FILTER_SKIP;\n\t\t\t}\n\t\t} );\n\n\t\ttreeWalker.currentNode = node;\n\n\t\tconst touchingNode = treeWalker[ direction ]();\n\n\t\tif ( touchingNode !== null ) {\n\t\t\tconst lca = getCommonAncestor( node, touchingNode );\n\n\t\t\t// If there is common ancestor between the text node and next/prev text node,\n\t\t\t// and there are no block elements on a way from the text node to that ancestor,\n\t\t\t// and there are no block elements on a way from next/prev text node to that ancestor...\n\t\t\tif (\n\t\t\t\tlca &&\n\t\t\t\t!_hasDomParentOfType( node, this.blockElements, lca ) &&\n\t\t\t\t!_hasDomParentOfType( touchingNode, this.blockElements, lca )\n\t\t\t) {\n\t\t\t\t// Then they are in the same container element.\n\t\t\t\treturn touchingNode;\n\t\t\t}\n\t\t}\n\n\t\treturn null;\n\t}\n}\n\n// Helper function.\n// Used to check if given native `Element` or `Text` node has parent with tag name from `types` array.\n//\n// @param {Node} node\n// @param {Array.<String>} types\n// @param {Boolean} [boundaryParent] Can be given if parents should be checked up to a given element (excluding that element).\n// @returns {Boolean} `true` if such parent exists or `false` if it does not.\nfunction _hasDomParentOfType( node, types, boundaryParent ) {\n\tlet parents = getAncestors( node );\n\n\tif ( boundaryParent ) {\n\t\tparents = parents.slice( parents.indexOf( boundaryParent ) + 1 );\n\t}\n\n\treturn parents.some( parent => parent.tagName && types.includes( parent.tagName.toLowerCase() ) );\n}\n\n// A helper that executes given callback for each DOM node's ancestor, starting from the given node\n// and ending in document#documentElement.\n//\n// @param {Node} node\n// @param {Function} callback A callback to be executed for each ancestor.\nfunction forEachDomNodeAncestor( node, callback ) {\n\twhile ( node && node != global.document ) {\n\t\tcallback( node );\n\t\tnode = node.parentNode;\n\t}\n}\n\n// Checks if given node is a nbsp block filler.\n//\n// A &nbsp; is a block filler only if it is a single child of a block element.\n//\n// @param {Node} domNode DOM node.\n// @returns {Boolean}\nfunction isNbspBlockFiller( domNode, blockElements ) {\n\tconst isNBSP = isText( domNode ) && domNode.data == '\\u00A0';\n\n\treturn isNBSP && hasBlockParent( domNode, blockElements ) && domNode.parentNode.childNodes.length === 1;\n}\n\n// Checks if domNode has block parent.\n//\n// @param {Node} domNode DOM node.\n// @returns {Boolean}\nfunction hasBlockParent( domNode, blockElements ) {\n\tconst parent = domNode.parentNode;\n\n\treturn parent && parent.tagName && blockElements.includes( parent.tagName.toLowerCase() );\n}\n\n/**\n * Enum representing type of the block filler.\n *\n * Possible values:\n *\n * * `br` - for `<br>` block filler used in editing view,\n * * `nbsp` - for `&nbsp;` block fillers used in the data.\n *\n * @typedef {String} module:engine/view/filler~BlockFillerMode\n */\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module utils/dom/getcommonancestor\n */\n\nimport getAncestors from './getancestors';\n\n/**\n * Searches and returns the lowest common ancestor of two given nodes.\n *\n * @param {Node} nodeA First node.\n * @param {Node} nodeB Second node.\n * @returns {Node|DocumentFragment|Document|null} Lowest common ancestor of both nodes or `null` if nodes do not have a common ancestor.\n */\nexport default function getCommonAncestor( nodeA, nodeB ) {\n\tconst ancestorsA = getAncestors( nodeA );\n\tconst ancestorsB = getAncestors( nodeB );\n\n\tlet i = 0;\n\n\t// It does not matter which array is shorter.\n\twhile ( ancestorsA[ i ] == ancestorsB[ i ] && ancestorsA[ i ] ) {\n\t\ti++;\n\t}\n\n\treturn i === 0 ? null : ancestorsA[ i - 1 ];\n}\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module utils/dom/iswindow\n */\n\n/**\n * Checks if the object is a native DOM Window.\n *\n * @param {*} obj\n * @returns {Boolean}\n */\nexport default function isWindow( obj ) {\n\tconst stringifiedObject = Object.prototype.toString.apply( obj );\n\n\t// Returns `true` for the `window` object in browser environments.\n\tif ( stringifiedObject == '[object Window]' ) {\n\t\treturn true;\n\t}\n\n\t// Returns `true` for the `window` object in the Electron environment.\n\tif ( stringifiedObject == '[object global]' ) {\n\t\treturn true;\n\t}\n\n\treturn false;\n}\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module utils/dom/emittermixin\n */\n\nimport { default as EmitterMixin, _getEmitterListenedTo, _setEmitterId } from '../emittermixin';\nimport uid from '../uid';\nimport isNode from './isnode';\nimport isWindow from './iswindow';\nimport { extend } from 'lodash-es';\n\n/**\n * Mixin that injects the DOM events API into its host. It provides the API\n * compatible with {@link module:utils/emittermixin~EmitterMixin}.\n *\n * DOM emitter mixin is by default available in the {@link module:ui/view~View} class,\n * but it can also be mixed into any other class:\n *\n *\t\timport mix from '../utils/mix.js';\n *\t\timport DomEmitterMixin from '../utils/dom/emittermixin.js';\n *\n *\t\tclass SomeView {}\n *\t\tmix( SomeView, DomEmitterMixin );\n *\n *\t\tconst view = new SomeView();\n *\t\tview.listenTo( domElement, ( evt, domEvt ) => {\n *\t\t\tconsole.log( evt, domEvt );\n *\t\t} );\n *\n * @mixin EmitterMixin\n * @mixes module:utils/emittermixin~EmitterMixin\n * @implements module:utils/dom/emittermixin~Emitter\n */\nconst DomEmitterMixin = extend( {}, EmitterMixin, {\n\t/**\n\t * Registers a callback function to be executed when an event is fired in a specific Emitter or DOM Node.\n\t * It is backwards compatible with {@link module:utils/emittermixin~EmitterMixin#listenTo}.\n\t *\n\t * @param {module:utils/emittermixin~Emitter|Node} emitter The object that fires the event.\n\t * @param {String} event The name of the event.\n\t * @param {Function} callback The function to be called on event.\n\t * @param {Object} [options={}] Additional options.\n\t * @param {module:utils/priorities~PriorityString|Number} [options.priority='normal'] The priority of this event callback. The higher\n\t * the priority value the sooner the callback will be fired. Events having the same priority are called in the\n\t * order they were added.\n\t * @param {Boolean} [options.useCapture=false] Indicates that events of this type will be dispatched to the registered\n\t * listener before being dispatched to any EventTarget beneath it in the DOM tree.\n\t * @param {Boolean} [options.usePassive=false] Indicates that the function specified by listener will never call preventDefault()\n\t * and prevents blocking browser's main thread by this event handler.\n\t */\n\tlistenTo( emitter, ...rest ) {\n\t\t// Check if emitter is an instance of DOM Node. If so, replace the argument with\n\t\t// corresponding ProxyEmitter (or create one if not existing).\n\t\tif ( isNode( emitter ) || isWindow( emitter ) ) {\n\t\t\tconst proxy = this._getProxyEmitter( emitter ) || new ProxyEmitter( emitter );\n\n\t\t\tproxy.attach( ...rest );\n\n\t\t\temitter = proxy;\n\t\t}\n\n\t\t// Execute parent class method with Emitter (or ProxyEmitter) instance.\n\t\tEmitterMixin.listenTo.call( this, emitter, ...rest );\n\t},\n\n\t/**\n\t * Stops listening for events. It can be used at different levels:\n\t * It is backwards compatible with {@link module:utils/emittermixin~EmitterMixin#listenTo}.\n\t *\n\t * * To stop listening to a specific callback.\n\t * * To stop listening to a specific event.\n\t * * To stop listening to all events fired by a specific object.\n\t * * To stop listening to all events fired by all object.\n\t *\n\t * @param {module:utils/emittermixin~Emitter|Node} [emitter] The object to stop listening to. If omitted, stops it for all objects.\n\t * @param {String} [event] (Requires the `emitter`) The name of the event to stop listening to. If omitted, stops it\n\t * for all events from `emitter`.\n\t * @param {Function} [callback] (Requires the `event`) The function to be removed from the call list for the given\n\t * `event`.\n\t */\n\tstopListening( emitter, event, callback ) {\n\t\t// Check if emitter is an instance of DOM Node. If so, replace the argument with corresponding ProxyEmitter.\n\t\tif ( isNode( emitter ) || isWindow( emitter ) ) {\n\t\t\tconst proxy = this._getProxyEmitter( emitter );\n\n\t\t\t// Element has no listeners.\n\t\t\tif ( !proxy ) {\n\t\t\t\treturn;\n\t\t\t}\n\n\t\t\temitter = proxy;\n\t\t}\n\n\t\t// Execute parent class method with Emitter (or ProxyEmitter) instance.\n\t\tEmitterMixin.stopListening.call( this, emitter, event, callback );\n\n\t\tif ( emitter instanceof ProxyEmitter ) {\n\t\t\temitter.detach( event );\n\t\t}\n\t},\n\n\t/**\n\t * Retrieves ProxyEmitter instance for given DOM Node residing in this Host.\n\t *\n\t * @private\n\t * @param {Node} node DOM Node of the ProxyEmitter.\n\t * @returns {module:utils/dom/emittermixin~ProxyEmitter} ProxyEmitter instance or null.\n\t */\n\t_getProxyEmitter( node ) {\n\t\treturn _getEmitterListenedTo( this, getNodeUID( node ) );\n\t}\n} );\n\nexport default DomEmitterMixin;\n\n/**\n * Creates a ProxyEmitter instance. Such an instance is a bridge between a DOM Node firing events\n * and any Host listening to them. It is backwards compatible with {@link module:utils/emittermixin~EmitterMixin#on}.\n *\n *                                  listenTo( click, ... )\n *                    +-----------------------------------------+\n *                    |              stopListening( ... )       |\n *     +----------------------------+                           |             addEventListener( click, ... )\n *     | Host                       |                           |   +---------------------------------------------+\n *     +----------------------------+                           |   |       removeEventListener( click, ... )     |\n *     | _listeningTo: {            |                +----------v-------------+                                   |\n *     |   UID: {                   |                | ProxyEmitter           |                                   |\n *     |     emitter: ProxyEmitter, |                +------------------------+                      +------------v----------+\n *     |     callbacks: {           |                | events: {              |                      | Node (HTMLElement)    |\n *     |       click: [ callbacks ] |                |   click: [ callbacks ] |                      +-----------------------+\n *     |     }                      |                | },                     |                      | data-ck-expando: UID  |\n *     |   }                        |                | _domNode: Node,        |                      +-----------------------+\n *     | }                          |                | _domListeners: {},     |                                   |\n *     | +------------------------+ |                | _emitterId: UID        |                                   |\n *     | | DomEmitterMixin        | |                +--------------^---------+                                   |\n *     | +------------------------+ |                           |   |                                             |\n *     +--------------^-------------+                           |   +---------------------------------------------+\n *                    |                                         |                  click (DOM Event)\n *                    +-----------------------------------------+\n *                                fire( click, DOM Event )\n *\n * @mixes module:utils/emittermixin~EmitterMixin\n * @implements module:utils/dom/emittermixin~Emitter\n * @private\n */\nclass ProxyEmitter {\n\t/**\n\t * @param {Node} node DOM Node that fires events.\n\t * @returns {Object} ProxyEmitter instance bound to the DOM Node.\n\t */\n\tconstructor( node ) {\n\t\t// Set emitter ID to match DOM Node \"expando\" property.\n\t\t_setEmitterId( this, getNodeUID( node ) );\n\n\t\t// Remember the DOM Node this ProxyEmitter is bound to.\n\t\tthis._domNode = node;\n\t}\n}\n\nextend( ProxyEmitter.prototype, EmitterMixin, {\n\t/**\n\t * Collection of native DOM listeners.\n\t *\n\t * @private\n\t * @member {Object} module:utils/dom/emittermixin~ProxyEmitter#_domListeners\n\t */\n\n\t/**\n\t * Registers a callback function to be executed when an event is fired.\n\t *\n\t * It attaches a native DOM listener to the DOM Node. When fired,\n\t * a corresponding Emitter event will also fire with DOM Event object as an argument.\n\t *\n\t * @method module:utils/dom/emittermixin~ProxyEmitter#attach\n\t * @param {String} event The name of the event.\n\t * @param {Function} callback The function to be called on event.\n\t * @param {Object} [options={}] Additional options.\n\t * @param {Boolean} [options.useCapture=false] Indicates that events of this type will be dispatched to the registered\n\t * listener before being dispatched to any EventTarget beneath it in the DOM tree.\n\t * @param {Boolean} [options.usePassive=false] Indicates that the function specified by listener will never call preventDefault()\n\t * and prevents blocking browser's main thread by this event handler.\n\t */\n\tattach( event, callback, options = {} ) {\n\t\t// If the DOM Listener for given event already exist it is pointless\n\t\t// to attach another one.\n\t\tif ( this._domListeners && this._domListeners[ event ] ) {\n\t\t\treturn;\n\t\t}\n\n\t\tconst listenerOptions = {\n\t\t\tcapture: !!options.useCapture,\n\t\t\tpassive: !!options.usePassive\n\t\t};\n\n\t\tconst domListener = this._createDomListener( event, listenerOptions );\n\n\t\t// Attach the native DOM listener to DOM Node.\n\t\tthis._domNode.addEventListener( event, domListener, listenerOptions );\n\n\t\tif ( !this._domListeners ) {\n\t\t\tthis._domListeners = {};\n\t\t}\n\n\t\t// Store the native DOM listener in this ProxyEmitter. It will be helpful\n\t\t// when stopping listening to the event.\n\t\tthis._domListeners[ event ] = domListener;\n\t},\n\n\t/**\n\t * Stops executing the callback on the given event.\n\t *\n\t * @method module:utils/dom/emittermixin~ProxyEmitter#detach\n\t * @param {String} event The name of the event.\n\t */\n\tdetach( event ) {\n\t\tlet events;\n\n\t\t// Remove native DOM listeners which are orphans. If no callbacks\n\t\t// are awaiting given event, detach native DOM listener from DOM Node.\n\t\t// See: {@link attach}.\n\n\t\tif ( this._domListeners[ event ] && ( !( events = this._events[ event ] ) || !events.callbacks.length ) ) {\n\t\t\tthis._domListeners[ event ].removeListener();\n\t\t}\n\t},\n\n\t/**\n\t * Creates a native DOM listener callback. When the native DOM event\n\t * is fired it will fire corresponding event on this ProxyEmitter.\n\t * Note: A native DOM Event is passed as an argument.\n\t *\n\t * @private\n\t * @method module:utils/dom/emittermixin~ProxyEmitter#_createDomListener\n\t * @param {String} event The name of the event.\n\t * @param {Object} [options] Additional options.\n\t * @param {Boolean} [options.capture=false] Indicates whether the listener was created for capturing event.\n\t * @param {Boolean} [options.passive=false] Indicates that the function specified by listener will never call preventDefault()\n\t * and prevents blocking browser's main thread by this event handler.\n\t * @returns {Function} The DOM listener callback.\n\t */\n\t_createDomListener( event, options ) {\n\t\tconst domListener = domEvt => {\n\t\t\tthis.fire( event, domEvt );\n\t\t};\n\n\t\t// Supply the DOM listener callback with a function that will help\n\t\t// detach it from the DOM Node, when it is no longer necessary.\n\t\t// See: {@link detach}.\n\t\tdomListener.removeListener = () => {\n\t\t\tthis._domNode.removeEventListener( event, domListener, options );\n\t\t\tdelete this._domListeners[ event ];\n\t\t};\n\n\t\treturn domListener;\n\t}\n} );\n\n// Gets an unique DOM Node identifier. The identifier will be set if not defined.\n//\n// @private\n// @param {Node} node\n// @returns {String} UID for given DOM Node.\nfunction getNodeUID( node ) {\n\treturn node[ 'data-ck-expando' ] || ( node[ 'data-ck-expando' ] = uid() );\n}\n\n/**\n * Interface representing classes which mix in {@link module:utils/dom/emittermixin~EmitterMixin}.\n *\n * @interface Emitter\n */\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module engine/view/observer/observer\n */\n\nimport DomEmitterMixin from '@ckeditor/ckeditor5-utils/src/dom/emittermixin';\nimport mix from '@ckeditor/ckeditor5-utils/src/mix';\n\n/**\n * Abstract base observer class. Observers are classes which listen to DOM events, do the preliminary\n * processing and fire events on the {@link module:engine/view/document~Document} objects.\n * Observers can also add features to the view, for instance by updating its status or marking elements\n * which need a refresh on DOM events.\n *\n * @abstract\n */\nexport default class Observer {\n\t/**\n\t * Creates an instance of the observer.\n\t *\n\t * @param {module:engine/view/view~View} view\n\t */\n\tconstructor( view ) {\n\t\t/**\n\t\t * An instance of the view controller.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:engine/view/view~View}\n\t\t */\n\t\tthis.view = view;\n\n\t\t/**\n\t\t * A reference to the {@link module:engine/view/document~Document} object.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:engine/view/document~Document}\n\t\t */\n\t\tthis.document = view.document;\n\n\t\t/**\n\t\t * State of the observer. If it is disabled no events will be fired.\n\t\t *\n\t\t * @readonly\n\t\t * @member {Boolean}\n\t\t */\n\t\tthis.isEnabled = false;\n\t}\n\n\t/**\n\t * Enables the observer. This method is called when the observer is registered to the\n\t * {@link module:engine/view/view~View} and after {@link module:engine/view/view~View#forceRender rendering}\n\t * (all observers are {@link #disable disabled} before rendering).\n\t *\n\t * A typical use case for disabling observers is that mutation observers need to be disabled for the rendering.\n\t * However, a child class may not need to be disabled, so it can implement an empty method.\n\t *\n\t * @see module:engine/view/observer/observer~Observer#disable\n\t */\n\tenable() {\n\t\tthis.isEnabled = true;\n\t}\n\n\t/**\n\t * Disables the observer. This method is called before\n\t * {@link module:engine/view/view~View#forceRender rendering} to prevent firing events during rendering.\n\t *\n\t * @see module:engine/view/observer/observer~Observer#enable\n\t */\n\tdisable() {\n\t\tthis.isEnabled = false;\n\t}\n\n\t/**\n\t * Disables and destroys the observer, among others removes event listeners created by the observer.\n\t */\n\tdestroy() {\n\t\tthis.disable();\n\t\tthis.stopListening();\n\t}\n\n\t/**\n\t * Checks whether a given DOM event should be ignored (should not be turned into a synthetic view document event).\n\t *\n\t * Currently, an event will be ignored only if its target or any of its ancestors has the `data-cke-ignore-events` attribute.\n\t * This attribute can be used inside the structures generated by\n\t * {@link module:engine/view/downcastwriter~DowncastWriter#createUIElement `DowncastWriter#createUIElement()`} to ignore events\n\t * fired within a UI that should be excluded from CKEditor 5's realms.\n\t *\n\t * @param {Node} domTarget The DOM event target to check (usually an element, sometimes a text node and\n\t * potentially sometimes a document, too).\n\t * @returns {Boolean} Whether this event should be ignored by the observer.\n\t */\n\tcheckShouldIgnoreEventFromTarget( domTarget ) {\n\t\tif ( domTarget && domTarget.nodeType === 3 ) {\n\t\t\tdomTarget = domTarget.parentNode;\n\t\t}\n\n\t\tif ( !domTarget || domTarget.nodeType !== 1 ) {\n\t\t\treturn false;\n\t\t}\n\n\t\treturn domTarget.matches( '[data-cke-ignore-events], [data-cke-ignore-events] *' );\n\t}\n\n\t/**\n\t * Starts observing the given root element.\n\t *\n\t * @method #observe\n\t * @param {HTMLElement} domElement\n\t * @param {String} name The name of the root element.\n\t */\n}\n\nmix( Observer, DomEmitterMixin );\n","/** Used to stand-in for `undefined` hash values. */\nvar HASH_UNDEFINED = '__lodash_hash_undefined__';\n\n/**\n * Adds `value` to the array cache.\n *\n * @private\n * @name add\n * @memberOf SetCache\n * @alias push\n * @param {*} value The value to cache.\n * @returns {Object} Returns the cache instance.\n */\nfunction setCacheAdd(value) {\n  this.__data__.set(value, HASH_UNDEFINED);\n  return this;\n}\n\nexport default setCacheAdd;\n","/**\n * Checks if `value` is in the array cache.\n *\n * @private\n * @name has\n * @memberOf SetCache\n * @param {*} value The value to search for.\n * @returns {number} Returns `true` if `value` is found, else `false`.\n */\nfunction setCacheHas(value) {\n  return this.__data__.has(value);\n}\n\nexport default setCacheHas;\n","import MapCache from './_MapCache.js';\nimport setCacheAdd from './_setCacheAdd.js';\nimport setCacheHas from './_setCacheHas.js';\n\n/**\n *\n * Creates an array cache object to store unique values.\n *\n * @private\n * @constructor\n * @param {Array} [values] The values to cache.\n */\nfunction SetCache(values) {\n  var index = -1,\n      length = values == null ? 0 : values.length;\n\n  this.__data__ = new MapCache;\n  while (++index < length) {\n    this.add(values[index]);\n  }\n}\n\n// Add methods to `SetCache`.\nSetCache.prototype.add = SetCache.prototype.push = setCacheAdd;\nSetCache.prototype.has = setCacheHas;\n\nexport default SetCache;\n","/**\n * A specialized version of `_.some` for arrays without support for iteratee\n * shorthands.\n *\n * @private\n * @param {Array} [array] The array to iterate over.\n * @param {Function} predicate The function invoked per iteration.\n * @returns {boolean} Returns `true` if any element passes the predicate check,\n *  else `false`.\n */\nfunction arraySome(array, predicate) {\n  var index = -1,\n      length = array == null ? 0 : array.length;\n\n  while (++index < length) {\n    if (predicate(array[index], index, array)) {\n      return true;\n    }\n  }\n  return false;\n}\n\nexport default arraySome;\n","/**\n * Checks if a `cache` value for `key` exists.\n *\n * @private\n * @param {Object} cache The cache to query.\n * @param {string} key The key of the entry to check.\n * @returns {boolean} Returns `true` if an entry for `key` exists, else `false`.\n */\nfunction cacheHas(cache, key) {\n  return cache.has(key);\n}\n\nexport default cacheHas;\n","import SetCache from './_SetCache.js';\nimport arraySome from './_arraySome.js';\nimport cacheHas from './_cacheHas.js';\n\n/** Used to compose bitmasks for value comparisons. */\nvar COMPARE_PARTIAL_FLAG = 1,\n    COMPARE_UNORDERED_FLAG = 2;\n\n/**\n * A specialized version of `baseIsEqualDeep` for arrays with support for\n * partial deep comparisons.\n *\n * @private\n * @param {Array} array The array to compare.\n * @param {Array} other The other array to compare.\n * @param {number} bitmask The bitmask flags. See `baseIsEqual` for more details.\n * @param {Function} customizer The function to customize comparisons.\n * @param {Function} equalFunc The function to determine equivalents of values.\n * @param {Object} stack Tracks traversed `array` and `other` objects.\n * @returns {boolean} Returns `true` if the arrays are equivalent, else `false`.\n */\nfunction equalArrays(array, other, bitmask, customizer, equalFunc, stack) {\n  var isPartial = bitmask & COMPARE_PARTIAL_FLAG,\n      arrLength = array.length,\n      othLength = other.length;\n\n  if (arrLength != othLength && !(isPartial && othLength > arrLength)) {\n    return false;\n  }\n  // Check that cyclic values are equal.\n  var arrStacked = stack.get(array);\n  var othStacked = stack.get(other);\n  if (arrStacked && othStacked) {\n    return arrStacked == other && othStacked == array;\n  }\n  var index = -1,\n      result = true,\n      seen = (bitmask & COMPARE_UNORDERED_FLAG) ? new SetCache : undefined;\n\n  stack.set(array, other);\n  stack.set(other, array);\n\n  // Ignore non-index properties.\n  while (++index < arrLength) {\n    var arrValue = array[index],\n        othValue = other[index];\n\n    if (customizer) {\n      var compared = isPartial\n        ? customizer(othValue, arrValue, index, other, array, stack)\n        : customizer(arrValue, othValue, index, array, other, stack);\n    }\n    if (compared !== undefined) {\n      if (compared) {\n        continue;\n      }\n      result = false;\n      break;\n    }\n    // Recursively compare arrays (susceptible to call stack limits).\n    if (seen) {\n      if (!arraySome(other, function(othValue, othIndex) {\n            if (!cacheHas(seen, othIndex) &&\n                (arrValue === othValue || equalFunc(arrValue, othValue, bitmask, customizer, stack))) {\n              return seen.push(othIndex);\n            }\n          })) {\n        result = false;\n        break;\n      }\n    } else if (!(\n          arrValue === othValue ||\n            equalFunc(arrValue, othValue, bitmask, customizer, stack)\n        )) {\n      result = false;\n      break;\n    }\n  }\n  stack['delete'](array);\n  stack['delete'](other);\n  return result;\n}\n\nexport default equalArrays;\n","/**\n * Converts `map` to its key-value pairs.\n *\n * @private\n * @param {Object} map The map to convert.\n * @returns {Array} Returns the key-value pairs.\n */\nfunction mapToArray(map) {\n  var index = -1,\n      result = Array(map.size);\n\n  map.forEach(function(value, key) {\n    result[++index] = [key, value];\n  });\n  return result;\n}\n\nexport default mapToArray;\n","/**\n * Converts `set` to an array of its values.\n *\n * @private\n * @param {Object} set The set to convert.\n * @returns {Array} Returns the values.\n */\nfunction setToArray(set) {\n  var index = -1,\n      result = Array(set.size);\n\n  set.forEach(function(value) {\n    result[++index] = value;\n  });\n  return result;\n}\n\nexport default setToArray;\n","import Symbol from './_Symbol.js';\nimport Uint8Array from './_Uint8Array.js';\nimport eq from './eq.js';\nimport equalArrays from './_equalArrays.js';\nimport mapToArray from './_mapToArray.js';\nimport setToArray from './_setToArray.js';\n\n/** Used to compose bitmasks for value comparisons. */\nvar COMPARE_PARTIAL_FLAG = 1,\n    COMPARE_UNORDERED_FLAG = 2;\n\n/** `Object#toString` result references. */\nvar boolTag = '[object Boolean]',\n    dateTag = '[object Date]',\n    errorTag = '[object Error]',\n    mapTag = '[object Map]',\n    numberTag = '[object Number]',\n    regexpTag = '[object RegExp]',\n    setTag = '[object Set]',\n    stringTag = '[object String]',\n    symbolTag = '[object Symbol]';\n\nvar arrayBufferTag = '[object ArrayBuffer]',\n    dataViewTag = '[object DataView]';\n\n/** Used to convert symbols to primitives and strings. */\nvar symbolProto = Symbol ? Symbol.prototype : undefined,\n    symbolValueOf = symbolProto ? symbolProto.valueOf : undefined;\n\n/**\n * A specialized version of `baseIsEqualDeep` for comparing objects of\n * the same `toStringTag`.\n *\n * **Note:** This function only supports comparing values with tags of\n * `Boolean`, `Date`, `Error`, `Number`, `RegExp`, or `String`.\n *\n * @private\n * @param {Object} object The object to compare.\n * @param {Object} other The other object to compare.\n * @param {string} tag The `toStringTag` of the objects to compare.\n * @param {number} bitmask The bitmask flags. See `baseIsEqual` for more details.\n * @param {Function} customizer The function to customize comparisons.\n * @param {Function} equalFunc The function to determine equivalents of values.\n * @param {Object} stack Tracks traversed `object` and `other` objects.\n * @returns {boolean} Returns `true` if the objects are equivalent, else `false`.\n */\nfunction equalByTag(object, other, tag, bitmask, customizer, equalFunc, stack) {\n  switch (tag) {\n    case dataViewTag:\n      if ((object.byteLength != other.byteLength) ||\n          (object.byteOffset != other.byteOffset)) {\n        return false;\n      }\n      object = object.buffer;\n      other = other.buffer;\n\n    case arrayBufferTag:\n      if ((object.byteLength != other.byteLength) ||\n          !equalFunc(new Uint8Array(object), new Uint8Array(other))) {\n        return false;\n      }\n      return true;\n\n    case boolTag:\n    case dateTag:\n    case numberTag:\n      // Coerce booleans to `1` or `0` and dates to milliseconds.\n      // Invalid dates are coerced to `NaN`.\n      return eq(+object, +other);\n\n    case errorTag:\n      return object.name == other.name && object.message == other.message;\n\n    case regexpTag:\n    case stringTag:\n      // Coerce regexes to strings and treat strings, primitives and objects,\n      // as equal. See http://www.ecma-international.org/ecma-262/7.0/#sec-regexp.prototype.tostring\n      // for more details.\n      return object == (other + '');\n\n    case mapTag:\n      var convert = mapToArray;\n\n    case setTag:\n      var isPartial = bitmask & COMPARE_PARTIAL_FLAG;\n      convert || (convert = setToArray);\n\n      if (object.size != other.size && !isPartial) {\n        return false;\n      }\n      // Assume cyclic values are equal.\n      var stacked = stack.get(object);\n      if (stacked) {\n        return stacked == other;\n      }\n      bitmask |= COMPARE_UNORDERED_FLAG;\n\n      // Recursively compare objects (susceptible to call stack limits).\n      stack.set(object, other);\n      var result = equalArrays(convert(object), convert(other), bitmask, customizer, equalFunc, stack);\n      stack['delete'](object);\n      return result;\n\n    case symbolTag:\n      if (symbolValueOf) {\n        return symbolValueOf.call(object) == symbolValueOf.call(other);\n      }\n  }\n  return false;\n}\n\nexport default equalByTag;\n","import getAllKeys from './_getAllKeys.js';\n\n/** Used to compose bitmasks for value comparisons. */\nvar COMPARE_PARTIAL_FLAG = 1;\n\n/** Used for built-in method references. */\nvar objectProto = Object.prototype;\n\n/** Used to check objects for own properties. */\nvar hasOwnProperty = objectProto.hasOwnProperty;\n\n/**\n * A specialized version of `baseIsEqualDeep` for objects with support for\n * partial deep comparisons.\n *\n * @private\n * @param {Object} object The object to compare.\n * @param {Object} other The other object to compare.\n * @param {number} bitmask The bitmask flags. See `baseIsEqual` for more details.\n * @param {Function} customizer The function to customize comparisons.\n * @param {Function} equalFunc The function to determine equivalents of values.\n * @param {Object} stack Tracks traversed `object` and `other` objects.\n * @returns {boolean} Returns `true` if the objects are equivalent, else `false`.\n */\nfunction equalObjects(object, other, bitmask, customizer, equalFunc, stack) {\n  var isPartial = bitmask & COMPARE_PARTIAL_FLAG,\n      objProps = getAllKeys(object),\n      objLength = objProps.length,\n      othProps = getAllKeys(other),\n      othLength = othProps.length;\n\n  if (objLength != othLength && !isPartial) {\n    return false;\n  }\n  var index = objLength;\n  while (index--) {\n    var key = objProps[index];\n    if (!(isPartial ? key in other : hasOwnProperty.call(other, key))) {\n      return false;\n    }\n  }\n  // Check that cyclic values are equal.\n  var objStacked = stack.get(object);\n  var othStacked = stack.get(other);\n  if (objStacked && othStacked) {\n    return objStacked == other && othStacked == object;\n  }\n  var result = true;\n  stack.set(object, other);\n  stack.set(other, object);\n\n  var skipCtor = isPartial;\n  while (++index < objLength) {\n    key = objProps[index];\n    var objValue = object[key],\n        othValue = other[key];\n\n    if (customizer) {\n      var compared = isPartial\n        ? customizer(othValue, objValue, key, other, object, stack)\n        : customizer(objValue, othValue, key, object, other, stack);\n    }\n    // Recursively compare objects (susceptible to call stack limits).\n    if (!(compared === undefined\n          ? (objValue === othValue || equalFunc(objValue, othValue, bitmask, customizer, stack))\n          : compared\n        )) {\n      result = false;\n      break;\n    }\n    skipCtor || (skipCtor = key == 'constructor');\n  }\n  if (result && !skipCtor) {\n    var objCtor = object.constructor,\n        othCtor = other.constructor;\n\n    // Non `Object` object instances with different constructors are not equal.\n    if (objCtor != othCtor &&\n        ('constructor' in object && 'constructor' in other) &&\n        !(typeof objCtor == 'function' && objCtor instanceof objCtor &&\n          typeof othCtor == 'function' && othCtor instanceof othCtor)) {\n      result = false;\n    }\n  }\n  stack['delete'](object);\n  stack['delete'](other);\n  return result;\n}\n\nexport default equalObjects;\n","import Stack from './_Stack.js';\nimport equalArrays from './_equalArrays.js';\nimport equalByTag from './_equalByTag.js';\nimport equalObjects from './_equalObjects.js';\nimport getTag from './_getTag.js';\nimport isArray from './isArray.js';\nimport isBuffer from './isBuffer.js';\nimport isTypedArray from './isTypedArray.js';\n\n/** Used to compose bitmasks for value comparisons. */\nvar COMPARE_PARTIAL_FLAG = 1;\n\n/** `Object#toString` result references. */\nvar argsTag = '[object Arguments]',\n    arrayTag = '[object Array]',\n    objectTag = '[object Object]';\n\n/** Used for built-in method references. */\nvar objectProto = Object.prototype;\n\n/** Used to check objects for own properties. */\nvar hasOwnProperty = objectProto.hasOwnProperty;\n\n/**\n * A specialized version of `baseIsEqual` for arrays and objects which performs\n * deep comparisons and tracks traversed objects enabling objects with circular\n * references to be compared.\n *\n * @private\n * @param {Object} object The object to compare.\n * @param {Object} other The other object to compare.\n * @param {number} bitmask The bitmask flags. See `baseIsEqual` for more details.\n * @param {Function} customizer The function to customize comparisons.\n * @param {Function} equalFunc The function to determine equivalents of values.\n * @param {Object} [stack] Tracks traversed `object` and `other` objects.\n * @returns {boolean} Returns `true` if the objects are equivalent, else `false`.\n */\nfunction baseIsEqualDeep(object, other, bitmask, customizer, equalFunc, stack) {\n  var objIsArr = isArray(object),\n      othIsArr = isArray(other),\n      objTag = objIsArr ? arrayTag : getTag(object),\n      othTag = othIsArr ? arrayTag : getTag(other);\n\n  objTag = objTag == argsTag ? objectTag : objTag;\n  othTag = othTag == argsTag ? objectTag : othTag;\n\n  var objIsObj = objTag == objectTag,\n      othIsObj = othTag == objectTag,\n      isSameTag = objTag == othTag;\n\n  if (isSameTag && isBuffer(object)) {\n    if (!isBuffer(other)) {\n      return false;\n    }\n    objIsArr = true;\n    objIsObj = false;\n  }\n  if (isSameTag && !objIsObj) {\n    stack || (stack = new Stack);\n    return (objIsArr || isTypedArray(object))\n      ? equalArrays(object, other, bitmask, customizer, equalFunc, stack)\n      : equalByTag(object, other, objTag, bitmask, customizer, equalFunc, stack);\n  }\n  if (!(bitmask & COMPARE_PARTIAL_FLAG)) {\n    var objIsWrapped = objIsObj && hasOwnProperty.call(object, '__wrapped__'),\n        othIsWrapped = othIsObj && hasOwnProperty.call(other, '__wrapped__');\n\n    if (objIsWrapped || othIsWrapped) {\n      var objUnwrapped = objIsWrapped ? object.value() : object,\n          othUnwrapped = othIsWrapped ? other.value() : other;\n\n      stack || (stack = new Stack);\n      return equalFunc(objUnwrapped, othUnwrapped, bitmask, customizer, stack);\n    }\n  }\n  if (!isSameTag) {\n    return false;\n  }\n  stack || (stack = new Stack);\n  return equalObjects(object, other, bitmask, customizer, equalFunc, stack);\n}\n\nexport default baseIsEqualDeep;\n","import baseIsEqualDeep from './_baseIsEqualDeep.js';\nimport isObjectLike from './isObjectLike.js';\n\n/**\n * The base implementation of `_.isEqual` which supports partial comparisons\n * and tracks traversed objects.\n *\n * @private\n * @param {*} value The value to compare.\n * @param {*} other The other value to compare.\n * @param {boolean} bitmask The bitmask flags.\n *  1 - Unordered comparison\n *  2 - Partial comparison\n * @param {Function} [customizer] The function to customize comparisons.\n * @param {Object} [stack] Tracks traversed `value` and `other` objects.\n * @returns {boolean} Returns `true` if the values are equivalent, else `false`.\n */\nfunction baseIsEqual(value, other, bitmask, customizer, stack) {\n  if (value === other) {\n    return true;\n  }\n  if (value == null || other == null || (!isObjectLike(value) && !isObjectLike(other))) {\n    return value !== value && other !== other;\n  }\n  return baseIsEqualDeep(value, other, bitmask, customizer, baseIsEqual, stack);\n}\n\nexport default baseIsEqual;\n","import baseIsEqual from './_baseIsEqual.js';\n\n/**\n * This method is like `_.isEqual` except that it accepts `customizer` which\n * is invoked to compare values. If `customizer` returns `undefined`, comparisons\n * are handled by the method instead. The `customizer` is invoked with up to\n * six arguments: (objValue, othValue [, index|key, object, other, stack]).\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category Lang\n * @param {*} value The value to compare.\n * @param {*} other The other value to compare.\n * @param {Function} [customizer] The function to customize comparisons.\n * @returns {boolean} Returns `true` if the values are equivalent, else `false`.\n * @example\n *\n * function isGreeting(value) {\n *   return /^h(?:i|ello)$/.test(value);\n * }\n *\n * function customizer(objValue, othValue) {\n *   if (isGreeting(objValue) && isGreeting(othValue)) {\n *     return true;\n *   }\n * }\n *\n * var array = ['hello', 'goodbye'];\n * var other = ['hi', 'goodbye'];\n *\n * _.isEqualWith(array, other, customizer);\n * // => true\n */\nfunction isEqualWith(value, other, customizer) {\n  customizer = typeof customizer == 'function' ? customizer : undefined;\n  var result = customizer ? customizer(value, other) : undefined;\n  return result === undefined ? baseIsEqual(value, other, undefined, customizer) : !!result;\n}\n\nexport default isEqualWith;\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module engine/view/observer/mutationobserver\n */\n\n/* globals window */\n\nimport Observer from './observer';\nimport ViewSelection from '../selection';\nimport { startsWithFiller, getDataWithoutFiller } from '../filler';\nimport { isEqualWith } from 'lodash-es';\n\n/**\n * Mutation observer class observes changes in the DOM, fires {@link module:engine/view/document~Document#event:mutations} event, mark view\n * elements as changed and call {@link module:engine/view/renderer~Renderer#render}.\n * Because all mutated nodes are marked as \"to be rendered\" and the\n * {@link module:engine/view/renderer~Renderer#render} is called, all changes will be reverted, unless the mutation will be handled by the\n * {@link module:engine/view/document~Document#event:mutations} event listener. It means user will see only handled changes, and the editor\n * will block all changes which are not handled.\n *\n * Mutation Observer also take care of reducing number of mutations which are fired. It removes duplicates and\n * mutations on elements which do not have corresponding view elements. Also\n * {@link module:engine/view/observer/mutationobserver~MutatedText text mutation} is fired only if parent element do not change child list.\n *\n * Note that this observer is attached by the {@link module:engine/view/view~View} and is available by default.\n *\n * @extends module:engine/view/observer/observer~Observer\n */\nexport default class MutationObserver extends Observer {\n\tconstructor( view ) {\n\t\tsuper( view );\n\n\t\t/**\n\t\t * Native mutation observer config.\n\t\t *\n\t\t * @private\n\t\t * @member {Object}\n\t\t */\n\t\tthis._config = {\n\t\t\tchildList: true,\n\t\t\tcharacterData: true,\n\t\t\tcharacterDataOldValue: true,\n\t\t\tsubtree: true\n\t\t};\n\n\t\t/**\n\t\t * Reference to the {@link module:engine/view/view~View#domConverter}.\n\t\t *\n\t\t * @member {module:engine/view/domconverter~DomConverter}\n\t\t */\n\t\tthis.domConverter = view.domConverter;\n\n\t\t/**\n\t\t * Reference to the {@link module:engine/view/view~View#_renderer}.\n\t\t *\n\t\t * @member {module:engine/view/renderer~Renderer}\n\t\t */\n\t\tthis.renderer = view._renderer;\n\n\t\t/**\n\t\t * Observed DOM elements.\n\t\t *\n\t\t * @private\n\t\t * @member {Array.<HTMLElement>}\n\t\t */\n\t\tthis._domElements = [];\n\n\t\t/**\n\t\t * Native mutation observer.\n\t\t *\n\t\t * @private\n\t\t * @member {MutationObserver}\n\t\t */\n\t\tthis._mutationObserver = new window.MutationObserver( this._onMutations.bind( this ) );\n\t}\n\n\t/**\n\t * Synchronously fires {@link module:engine/view/document~Document#event:mutations} event with all mutations in record queue.\n\t * At the same time empties the queue so mutations will not be fired twice.\n\t */\n\tflush() {\n\t\tthis._onMutations( this._mutationObserver.takeRecords() );\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tobserve( domElement ) {\n\t\tthis._domElements.push( domElement );\n\n\t\tif ( this.isEnabled ) {\n\t\t\tthis._mutationObserver.observe( domElement, this._config );\n\t\t}\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tenable() {\n\t\tsuper.enable();\n\n\t\tfor ( const domElement of this._domElements ) {\n\t\t\tthis._mutationObserver.observe( domElement, this._config );\n\t\t}\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tdisable() {\n\t\tsuper.disable();\n\n\t\tthis._mutationObserver.disconnect();\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tdestroy() {\n\t\tsuper.destroy();\n\n\t\tthis._mutationObserver.disconnect();\n\t}\n\n\t/**\n\t * Handles mutations. Deduplicates, mark view elements to sync, fire event and call render.\n\t *\n\t * @private\n\t * @param {Array.<Object>} domMutations Array of native mutations.\n\t */\n\t_onMutations( domMutations ) {\n\t\t// As a result of this.flush() we can have an empty collection.\n\t\tif ( domMutations.length === 0 ) {\n\t\t\treturn;\n\t\t}\n\n\t\tconst domConverter = this.domConverter;\n\n\t\t// Use map and set for deduplication.\n\t\tconst mutatedTexts = new Map();\n\t\tconst mutatedElements = new Set();\n\n\t\t// Handle `childList` mutations first, so we will be able to check if the `characterData` mutation is in the\n\t\t// element with changed structure anyway.\n\t\tfor ( const mutation of domMutations ) {\n\t\t\tif ( mutation.type === 'childList' ) {\n\t\t\t\tconst element = domConverter.mapDomToView( mutation.target );\n\n\t\t\t\t// Do not collect mutations from UIElements and RawElements.\n\t\t\t\tif ( element && ( element.is( 'uiElement' ) || element.is( 'rawElement' ) ) ) {\n\t\t\t\t\tcontinue;\n\t\t\t\t}\n\n\t\t\t\tif ( element && !this._isBogusBrMutation( mutation ) ) {\n\t\t\t\t\tmutatedElements.add( element );\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\n\t\t// Handle `characterData` mutations later, when we have the full list of nodes which changed structure.\n\t\tfor ( const mutation of domMutations ) {\n\t\t\tconst element = domConverter.mapDomToView( mutation.target );\n\n\t\t\t// Do not collect mutations from UIElements and RawElements.\n\t\t\tif ( element && ( element.is( 'uiElement' ) || element.is( 'rawElement' ) ) ) {\n\t\t\t\tcontinue;\n\t\t\t}\n\n\t\t\tif ( mutation.type === 'characterData' ) {\n\t\t\t\tconst text = domConverter.findCorrespondingViewText( mutation.target );\n\n\t\t\t\tif ( text && !mutatedElements.has( text.parent ) ) {\n\t\t\t\t\t// Use text as a key, for deduplication. If there will be another mutation on the same text element\n\t\t\t\t\t// we will have only one in the map.\n\t\t\t\t\tmutatedTexts.set( text, {\n\t\t\t\t\t\ttype: 'text',\n\t\t\t\t\t\toldText: text.data,\n\t\t\t\t\t\tnewText: getDataWithoutFiller( mutation.target ),\n\t\t\t\t\t\tnode: text\n\t\t\t\t\t} );\n\t\t\t\t}\n\t\t\t\t// When we added first letter to the text node which had only inline filler, for the DOM it is mutation\n\t\t\t\t// on text, but for the view, where filler text node did not existed, new text node was created, so we\n\t\t\t\t// need to fire 'children' mutation instead of 'text'.\n\t\t\t\telse if ( !text && startsWithFiller( mutation.target ) ) {\n\t\t\t\t\tmutatedElements.add( domConverter.mapDomToView( mutation.target.parentNode ) );\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\n\t\t// Now we build the list of mutations to fire and mark elements. We did not do it earlier to avoid marking the\n\t\t// same node multiple times in case of duplication.\n\n\t\t// List of mutations we will fire.\n\t\tconst viewMutations = [];\n\n\t\tfor ( const mutatedText of mutatedTexts.values() ) {\n\t\t\tthis.renderer.markToSync( 'text', mutatedText.node );\n\t\t\tviewMutations.push( mutatedText );\n\t\t}\n\n\t\tfor ( const viewElement of mutatedElements ) {\n\t\t\tconst domElement = domConverter.mapViewToDom( viewElement );\n\t\t\tconst viewChildren = Array.from( viewElement.getChildren() );\n\t\t\tconst newViewChildren = Array.from( domConverter.domChildrenToView( domElement, { withChildren: false } ) );\n\n\t\t\t// It may happen that as a result of many changes (sth was inserted and then removed),\n\t\t\t// both elements haven't really changed. #1031\n\t\t\tif ( !isEqualWith( viewChildren, newViewChildren, sameNodes ) ) {\n\t\t\t\tthis.renderer.markToSync( 'children', viewElement );\n\n\t\t\t\tviewMutations.push( {\n\t\t\t\t\ttype: 'children',\n\t\t\t\t\toldChildren: viewChildren,\n\t\t\t\t\tnewChildren: newViewChildren,\n\t\t\t\t\tnode: viewElement\n\t\t\t\t} );\n\t\t\t}\n\t\t}\n\n\t\t// Retrieve `domSelection` using `ownerDocument` of one of mutated nodes.\n\t\t// There should not be simultaneous mutation in multiple documents, so it's fine.\n\t\tconst domSelection = domMutations[ 0 ].target.ownerDocument.getSelection();\n\n\t\tlet viewSelection = null;\n\n\t\tif ( domSelection && domSelection.anchorNode ) {\n\t\t\t// If `domSelection` is inside a dom node that is already bound to a view node from view tree, get\n\t\t\t// corresponding selection in the view and pass it together with `viewMutations`. The `viewSelection` may\n\t\t\t// be used by features handling mutations.\n\t\t\t// Only one range is supported.\n\n\t\t\tconst viewSelectionAnchor = domConverter.domPositionToView( domSelection.anchorNode, domSelection.anchorOffset );\n\t\t\tconst viewSelectionFocus = domConverter.domPositionToView( domSelection.focusNode, domSelection.focusOffset );\n\n\t\t\t// Anchor and focus has to be properly mapped to view.\n\t\t\tif ( viewSelectionAnchor && viewSelectionFocus ) {\n\t\t\t\tviewSelection = new ViewSelection( viewSelectionAnchor );\n\t\t\t\tviewSelection.setFocus( viewSelectionFocus );\n\t\t\t}\n\t\t}\n\n\t\t// In case only non-relevant mutations were recorded it skips the event and force render (#5600).\n\t\tif ( viewMutations.length ) {\n\t\t\tthis.document.fire( 'mutations', viewMutations, viewSelection );\n\n\t\t\t// If nothing changes on `mutations` event, at this point we have \"dirty DOM\" (changed) and de-synched\n\t\t\t// view (which has not been changed). In order to \"reset DOM\" we render the view again.\n\t\t\tthis.view.forceRender();\n\t\t}\n\n\t\tfunction sameNodes( child1, child2 ) {\n\t\t\t// First level of comparison (array of children vs array of children) – use the Lodash's default behavior.\n\t\t\tif ( Array.isArray( child1 ) ) {\n\t\t\t\treturn;\n\t\t\t}\n\n\t\t\t// Elements.\n\t\t\tif ( child1 === child2 ) {\n\t\t\t\treturn true;\n\t\t\t}\n\t\t\t// Texts.\n\t\t\telse if ( child1.is( '$text' ) && child2.is( '$text' ) ) {\n\t\t\t\treturn child1.data === child2.data;\n\t\t\t}\n\n\t\t\t// Not matching types.\n\t\t\treturn false;\n\t\t}\n\t}\n\n\t/**\n\t * Checks if mutation was generated by the browser inserting bogus br on the end of the block element.\n\t * Such mutations are generated while pressing space or performing native spellchecker correction\n\t * on the end of the block element in Firefox browser.\n\t *\n\t * @private\n\t * @param {Object} mutation Native mutation object.\n\t * @returns {Boolean}\n\t */\n\t_isBogusBrMutation( mutation ) {\n\t\tlet addedNode = null;\n\n\t\t// Check if mutation added only one node on the end of its parent.\n\t\tif ( mutation.nextSibling === null && mutation.removedNodes.length === 0 && mutation.addedNodes.length == 1 ) {\n\t\t\taddedNode = this.domConverter.domToView( mutation.addedNodes[ 0 ], {\n\t\t\t\twithChildren: false\n\t\t\t} );\n\t\t}\n\n\t\treturn addedNode && addedNode.is( 'element', 'br' );\n\t}\n}\n\n/**\n * Fired when mutation occurred. If tree view is not changed on this event, DOM will be reverted to the state before\n * mutation, so all changes which should be applied, should be handled on this event.\n *\n * Introduced by {@link module:engine/view/observer/mutationobserver~MutationObserver}.\n *\n * Note that because {@link module:engine/view/observer/mutationobserver~MutationObserver} is attached by the\n * {@link module:engine/view/view~View} this event is available by default.\n *\n * @see module:engine/view/observer/mutationobserver~MutationObserver\n * @event module:engine/view/document~Document#event:mutations\n * @param {Array.<module:engine/view/observer/mutationobserver~MutatedText|module:engine/view/observer/mutationobserver~MutatedChildren>}\n * viewMutations Array of mutations.\n * For mutated texts it will be {@link module:engine/view/observer/mutationobserver~MutatedText} and for mutated elements it will be\n * {@link module:engine/view/observer/mutationobserver~MutatedChildren}. You can recognize the type based on the `type` property.\n * @param {module:engine/view/selection~Selection|null} viewSelection View selection that is a result of converting DOM selection to view.\n * Keep in\n * mind that the DOM selection is already \"updated\", meaning that it already acknowledges changes done in mutation.\n */\n\n/**\n * Mutation item for text.\n *\n * @see module:engine/view/document~Document#event:mutations\n * @see module:engine/view/observer/mutationobserver~MutatedChildren\n *\n * @typedef {Object} module:engine/view/observer/mutationobserver~MutatedText\n *\n * @property {String} type For text mutations it is always 'text'.\n * @property {module:engine/view/text~Text} node Mutated text node.\n * @property {String} oldText Old text.\n * @property {String} newText New text.\n */\n\n/**\n * Mutation item for child nodes.\n *\n * @see module:engine/view/document~Document#event:mutations\n * @see module:engine/view/observer/mutationobserver~MutatedText\n *\n * @typedef {Object} module:engine/view/observer/mutationobserver~MutatedChildren\n *\n * @property {String} type For child nodes mutations it is always 'children'.\n * @property {module:engine/view/element~Element} node Parent of the mutated children.\n * @property {Array.<module:engine/view/node~Node>} oldChildren Old child nodes.\n * @property {Array.<module:engine/view/node~Node>} newChildren New child nodes.\n */\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module engine/view/observer/domeventdata\n */\n\nimport { extend } from 'lodash-es';\n\n/**\n * Information about a DOM event in context of the {@link module:engine/view/document~Document}.\n * It wraps the native event, which usually should not be used as the wrapper contains\n * additional data (like key code for keyboard events).\n */\nexport default class DomEventData {\n\t/**\n\t * @param {module:engine/view/view~View} view The instance of the view controller.\n\t * @param {Event} domEvent The DOM event.\n\t * @param {Object} [additionalData] Additional properties that the instance should contain.\n\t */\n\tconstructor( view, domEvent, additionalData ) {\n\t\t/**\n\t\t * Instance of the view controller.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:engine/view/view~View} module:engine/view/observer/observer~Observer.DomEvent#view\n\t\t */\n\t\tthis.view = view;\n\n\t\t/**\n\t\t * The instance of the document.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:engine/view/document~Document} module:engine/view/observer/observer~Observer.DomEvent#document\n\t\t */\n\t\tthis.document = view.document;\n\n\t\t/**\n\t\t * The DOM event.\n\t\t *\n\t\t * @readonly\n\t\t * @member {Event} module:engine/view/observer/observer~Observer.DomEvent#domEvent\n\t\t */\n\t\tthis.domEvent = domEvent;\n\n\t\t/**\n\t\t * The DOM target.\n\t\t *\n\t\t * @readonly\n\t\t * @member {HTMLElement} module:engine/view/observer/observer~Observer.DomEvent#target\n\t\t */\n\t\tthis.domTarget = domEvent.target;\n\n\t\textend( this, additionalData );\n\t}\n\n\t/**\n\t * The tree view element representing the target.\n\t *\n\t * @readonly\n\t * @type module:engine/view/element~Element\n\t */\n\tget target() {\n\t\treturn this.view.domConverter.mapDomToView( this.domTarget );\n\t}\n\n\t/**\n\t * Prevents the native's event default action.\n\t */\n\tpreventDefault() {\n\t\tthis.domEvent.preventDefault();\n\t}\n\n\t/**\n\t * Stops native event propagation.\n\t */\n\tstopPropagation() {\n\t\tthis.domEvent.stopPropagation();\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module engine/view/observer/domeventobserver\n */\n\nimport Observer from './observer';\nimport DomEventData from './domeventdata';\n\n/**\n * Base class for DOM event observers. This class handles\n * {@link module:engine/view/observer/observer~Observer#observe adding} listeners to DOM elements,\n * {@link module:engine/view/observer/observer~Observer#disable disabling} and\n * {@link module:engine/view/observer/observer~Observer#enable re-enabling} events.\n * Child class needs to define\n * {@link module:engine/view/observer/domeventobserver~DomEventObserver#domEventType DOM event type} and\n * {@link module:engine/view/observer/domeventobserver~DomEventObserver#onDomEvent callback}.\n *\n * For instance:\n *\n *\t\tclass ClickObserver extends DomEventObserver {\n *\t\t\t// It can also be defined as a normal property in the constructor.\n *\t\t\tget domEventType() {\n *\t\t\t\treturn 'click';\n *\t\t\t}\n *\n *\t\t\tonDomEvent( domEvent ) {\n *\t\t\t\tthis.fire( 'click', domEvent );\n *\t\t\t}\n *\t\t}\n *\n * @extends module:engine/view/observer/observer~Observer\n */\nexport default class DomEventObserver extends Observer {\n\t/**\n\t * Type of the DOM event the observer should listen to. Array of types can be defined\n\t * if the observer should listen to multiple DOM events.\n\t *\n\t * @readonly\n\t * @member {String|Array.<String>} #domEventType\n\t */\n\n\t/**\n\t * Callback which should be called when the DOM event occurred. Note that the callback will not be called if\n\t * observer {@link #isEnabled is not enabled}.\n\t *\n\t * @see #domEventType\n\t * @abstract\n\t * @method #onDomEvent\n\t */\n\n\t/**\n\t * @inheritDoc\n\t */\n\tconstructor( view ) {\n\t\tsuper( view );\n\n\t\t/**\n\t\t * If set to `true` DOM events will be listened on the capturing phase.\n\t\t * Default value is `false`.\n\t\t *\n\t\t * @member {Boolean}\n\t\t */\n\t\tthis.useCapture = false;\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tobserve( domElement ) {\n\t\tconst types = typeof this.domEventType == 'string' ? [ this.domEventType ] : this.domEventType;\n\n\t\ttypes.forEach( type => {\n\t\t\tthis.listenTo( domElement, type, ( eventInfo, domEvent ) => {\n\t\t\t\tif ( this.isEnabled && !this.checkShouldIgnoreEventFromTarget( domEvent.target ) ) {\n\t\t\t\t\tthis.onDomEvent( domEvent );\n\t\t\t\t}\n\t\t\t}, { useCapture: this.useCapture } );\n\t\t} );\n\t}\n\n\t/**\n\t * Calls `Document#fire()` if observer {@link #isEnabled is enabled}.\n\t *\n\t * @see module:utils/emittermixin~EmitterMixin#fire\n\t * @param {String} eventType The event type (name).\n\t * @param {Event} domEvent The DOM event.\n\t * @param {Object} [additionalData] The additional data which should extend the\n\t * {@link module:engine/view/observer/domeventdata~DomEventData event data} object.\n\t */\n\tfire( eventType, domEvent, additionalData ) {\n\t\tif ( this.isEnabled ) {\n\t\t\tthis.document.fire( eventType, new DomEventData( this.view, domEvent, additionalData ) );\n\t\t}\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module engine/view/observer/keyobserver\n */\n\nimport DomEventObserver from './domeventobserver';\nimport { getCode } from '@ckeditor/ckeditor5-utils/src/keyboard';\n\n/**\n * Observer for events connected with pressing keyboard keys.\n *\n * Note that this observer is attached by the {@link module:engine/view/view~View} and is available by default.\n *\n * @extends module:engine/view/observer/domeventobserver~DomEventObserver\n */\nexport default class KeyObserver extends DomEventObserver {\n\tconstructor( view ) {\n\t\tsuper( view );\n\n\t\tthis.domEventType = [ 'keydown', 'keyup' ];\n\t}\n\n\tonDomEvent( domEvt ) {\n\t\tthis.fire( domEvt.type, domEvt, {\n\t\t\tkeyCode: domEvt.keyCode,\n\n\t\t\taltKey: domEvt.altKey,\n\t\t\tctrlKey: domEvt.ctrlKey || domEvt.metaKey,\n\t\t\tshiftKey: domEvt.shiftKey,\n\n\t\t\tget keystroke() {\n\t\t\t\treturn getCode( this );\n\t\t\t}\n\t\t} );\n\t}\n}\n\n/**\n * Fired when a key has been pressed.\n *\n * Introduced by {@link module:engine/view/observer/keyobserver~KeyObserver}.\n *\n * Note that because {@link module:engine/view/observer/keyobserver~KeyObserver} is attached by the\n * {@link module:engine/view/view~View} this event is available by default.\n *\n * @see module:engine/view/observer/keyobserver~KeyObserver\n * @event module:engine/view/document~Document#event:keydown\n * @param {module:engine/view/observer/keyobserver~KeyEventData} keyEventData\n */\n\n/**\n * Fired when a key has been released.\n *\n * Introduced by {@link module:engine/view/observer/keyobserver~KeyObserver}.\n *\n * Note that because {@link module:engine/view/observer/keyobserver~KeyObserver} is attached by the\n * {@link module:engine/view/view~View} this event is available by default.\n *\n * @see module:engine/view/observer/keyobserver~KeyObserver\n * @event module:engine/view/document~Document#event:keyup\n * @param {module:engine/view/observer/keyobserver~KeyEventData} keyEventData\n */\n\n/**\n * The value of both events - {@link module:engine/view/document~Document#event:keydown} and\n * {@link module:engine/view/document~Document#event:keyup}.\n *\n * @class module:engine/view/observer/keyobserver~KeyEventData\n * @extends module:engine/view/observer/domeventdata~DomEventData\n * @implements module:utils/keyboard~KeystrokeInfo\n */\n\n/**\n * Code of the whole keystroke. See {@link module:utils/keyboard~getCode}.\n *\n * @readonly\n * @member {Number} module:engine/view/observer/keyobserver~KeyEventData#keystroke\n */\n","import root from './_root.js';\n\n/**\n * Gets the timestamp of the number of milliseconds that have elapsed since\n * the Unix epoch (1 January 1970 00:00:00 UTC).\n *\n * @static\n * @memberOf _\n * @since 2.4.0\n * @category Date\n * @returns {number} Returns the timestamp.\n * @example\n *\n * _.defer(function(stamp) {\n *   console.log(_.now() - stamp);\n * }, _.now());\n * // => Logs the number of milliseconds it took for the deferred invocation.\n */\nvar now = function() {\n  return root.Date.now();\n};\n\nexport default now;\n","import isObject from './isObject.js';\nimport isSymbol from './isSymbol.js';\n\n/** Used as references for various `Number` constants. */\nvar NAN = 0 / 0;\n\n/** Used to match leading and trailing whitespace. */\nvar reTrim = /^\\s+|\\s+$/g;\n\n/** Used to detect bad signed hexadecimal string values. */\nvar reIsBadHex = /^[-+]0x[0-9a-f]+$/i;\n\n/** Used to detect binary string values. */\nvar reIsBinary = /^0b[01]+$/i;\n\n/** Used to detect octal string values. */\nvar reIsOctal = /^0o[0-7]+$/i;\n\n/** Built-in method references without a dependency on `root`. */\nvar freeParseInt = parseInt;\n\n/**\n * Converts `value` to a number.\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category Lang\n * @param {*} value The value to process.\n * @returns {number} Returns the number.\n * @example\n *\n * _.toNumber(3.2);\n * // => 3.2\n *\n * _.toNumber(Number.MIN_VALUE);\n * // => 5e-324\n *\n * _.toNumber(Infinity);\n * // => Infinity\n *\n * _.toNumber('3.2');\n * // => 3.2\n */\nfunction toNumber(value) {\n  if (typeof value == 'number') {\n    return value;\n  }\n  if (isSymbol(value)) {\n    return NAN;\n  }\n  if (isObject(value)) {\n    var other = typeof value.valueOf == 'function' ? value.valueOf() : value;\n    value = isObject(other) ? (other + '') : other;\n  }\n  if (typeof value != 'string') {\n    return value === 0 ? value : +value;\n  }\n  value = value.replace(reTrim, '');\n  var isBinary = reIsBinary.test(value);\n  return (isBinary || reIsOctal.test(value))\n    ? freeParseInt(value.slice(2), isBinary ? 2 : 8)\n    : (reIsBadHex.test(value) ? NAN : +value);\n}\n\nexport default toNumber;\n","import isObject from './isObject.js';\nimport now from './now.js';\nimport toNumber from './toNumber.js';\n\n/** Error message constants. */\nvar FUNC_ERROR_TEXT = 'Expected a function';\n\n/* Built-in method references for those with the same name as other `lodash` methods. */\nvar nativeMax = Math.max,\n    nativeMin = Math.min;\n\n/**\n * Creates a debounced function that delays invoking `func` until after `wait`\n * milliseconds have elapsed since the last time the debounced function was\n * invoked. The debounced function comes with a `cancel` method to cancel\n * delayed `func` invocations and a `flush` method to immediately invoke them.\n * Provide `options` to indicate whether `func` should be invoked on the\n * leading and/or trailing edge of the `wait` timeout. The `func` is invoked\n * with the last arguments provided to the debounced function. Subsequent\n * calls to the debounced function return the result of the last `func`\n * invocation.\n *\n * **Note:** If `leading` and `trailing` options are `true`, `func` is\n * invoked on the trailing edge of the timeout only if the debounced function\n * is invoked more than once during the `wait` timeout.\n *\n * If `wait` is `0` and `leading` is `false`, `func` invocation is deferred\n * until to the next tick, similar to `setTimeout` with a timeout of `0`.\n *\n * See [David Corbacho's article](https://css-tricks.com/debouncing-throttling-explained-examples/)\n * for details over the differences between `_.debounce` and `_.throttle`.\n *\n * @static\n * @memberOf _\n * @since 0.1.0\n * @category Function\n * @param {Function} func The function to debounce.\n * @param {number} [wait=0] The number of milliseconds to delay.\n * @param {Object} [options={}] The options object.\n * @param {boolean} [options.leading=false]\n *  Specify invoking on the leading edge of the timeout.\n * @param {number} [options.maxWait]\n *  The maximum time `func` is allowed to be delayed before it's invoked.\n * @param {boolean} [options.trailing=true]\n *  Specify invoking on the trailing edge of the timeout.\n * @returns {Function} Returns the new debounced function.\n * @example\n *\n * // Avoid costly calculations while the window size is in flux.\n * jQuery(window).on('resize', _.debounce(calculateLayout, 150));\n *\n * // Invoke `sendMail` when clicked, debouncing subsequent calls.\n * jQuery(element).on('click', _.debounce(sendMail, 300, {\n *   'leading': true,\n *   'trailing': false\n * }));\n *\n * // Ensure `batchLog` is invoked once after 1 second of debounced calls.\n * var debounced = _.debounce(batchLog, 250, { 'maxWait': 1000 });\n * var source = new EventSource('/stream');\n * jQuery(source).on('message', debounced);\n *\n * // Cancel the trailing debounced invocation.\n * jQuery(window).on('popstate', debounced.cancel);\n */\nfunction debounce(func, wait, options) {\n  var lastArgs,\n      lastThis,\n      maxWait,\n      result,\n      timerId,\n      lastCallTime,\n      lastInvokeTime = 0,\n      leading = false,\n      maxing = false,\n      trailing = true;\n\n  if (typeof func != 'function') {\n    throw new TypeError(FUNC_ERROR_TEXT);\n  }\n  wait = toNumber(wait) || 0;\n  if (isObject(options)) {\n    leading = !!options.leading;\n    maxing = 'maxWait' in options;\n    maxWait = maxing ? nativeMax(toNumber(options.maxWait) || 0, wait) : maxWait;\n    trailing = 'trailing' in options ? !!options.trailing : trailing;\n  }\n\n  function invokeFunc(time) {\n    var args = lastArgs,\n        thisArg = lastThis;\n\n    lastArgs = lastThis = undefined;\n    lastInvokeTime = time;\n    result = func.apply(thisArg, args);\n    return result;\n  }\n\n  function leadingEdge(time) {\n    // Reset any `maxWait` timer.\n    lastInvokeTime = time;\n    // Start the timer for the trailing edge.\n    timerId = setTimeout(timerExpired, wait);\n    // Invoke the leading edge.\n    return leading ? invokeFunc(time) : result;\n  }\n\n  function remainingWait(time) {\n    var timeSinceLastCall = time - lastCallTime,\n        timeSinceLastInvoke = time - lastInvokeTime,\n        timeWaiting = wait - timeSinceLastCall;\n\n    return maxing\n      ? nativeMin(timeWaiting, maxWait - timeSinceLastInvoke)\n      : timeWaiting;\n  }\n\n  function shouldInvoke(time) {\n    var timeSinceLastCall = time - lastCallTime,\n        timeSinceLastInvoke = time - lastInvokeTime;\n\n    // Either this is the first call, activity has stopped and we're at the\n    // trailing edge, the system time has gone backwards and we're treating\n    // it as the trailing edge, or we've hit the `maxWait` limit.\n    return (lastCallTime === undefined || (timeSinceLastCall >= wait) ||\n      (timeSinceLastCall < 0) || (maxing && timeSinceLastInvoke >= maxWait));\n  }\n\n  function timerExpired() {\n    var time = now();\n    if (shouldInvoke(time)) {\n      return trailingEdge(time);\n    }\n    // Restart the timer.\n    timerId = setTimeout(timerExpired, remainingWait(time));\n  }\n\n  function trailingEdge(time) {\n    timerId = undefined;\n\n    // Only invoke if we have `lastArgs` which means `func` has been\n    // debounced at least once.\n    if (trailing && lastArgs) {\n      return invokeFunc(time);\n    }\n    lastArgs = lastThis = undefined;\n    return result;\n  }\n\n  function cancel() {\n    if (timerId !== undefined) {\n      clearTimeout(timerId);\n    }\n    lastInvokeTime = 0;\n    lastArgs = lastCallTime = lastThis = timerId = undefined;\n  }\n\n  function flush() {\n    return timerId === undefined ? result : trailingEdge(now());\n  }\n\n  function debounced() {\n    var time = now(),\n        isInvoking = shouldInvoke(time);\n\n    lastArgs = arguments;\n    lastThis = this;\n    lastCallTime = time;\n\n    if (isInvoking) {\n      if (timerId === undefined) {\n        return leadingEdge(lastCallTime);\n      }\n      if (maxing) {\n        // Handle invocations in a tight loop.\n        clearTimeout(timerId);\n        timerId = setTimeout(timerExpired, wait);\n        return invokeFunc(lastCallTime);\n      }\n    }\n    if (timerId === undefined) {\n      timerId = setTimeout(timerExpired, wait);\n    }\n    return result;\n  }\n  debounced.cancel = cancel;\n  debounced.flush = flush;\n  return debounced;\n}\n\nexport default debounce;\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module engine/view/observer/fakeselectionobserver\n */\n\nimport Observer from './observer';\nimport ViewSelection from '../selection';\nimport { keyCodes, isArrowKeyCode } from '@ckeditor/ckeditor5-utils/src/keyboard';\nimport { debounce } from 'lodash-es';\n\n/**\n * Fake selection observer class. If view selection is fake it is placed in dummy DOM container. This observer listens\n * on {@link module:engine/view/document~Document#event:keydown keydown} events and handles moving fake view selection to the correct place\n * if arrow keys are pressed.\n * Fires {@link module:engine/view/document~Document#event:selectionChange selectionChange event} simulating natural behaviour of\n * {@link module:engine/view/observer/selectionobserver~SelectionObserver SelectionObserver}.\n *\n * @extends module:engine/view/observer/observer~Observer\n */\nexport default class FakeSelectionObserver extends Observer {\n\t/**\n\t * Creates new FakeSelectionObserver instance.\n\t *\n\t * @param {module:engine/view/view~View} view\n\t */\n\tconstructor( view ) {\n\t\tsuper( view );\n\n\t\t/**\n\t\t * Fires debounced event `selectionChangeDone`. It uses `lodash#debounce` method to delay function call.\n\t\t *\n\t\t * @private\n\t\t * @param {Object} data Selection change data.\n\t\t * @method #_fireSelectionChangeDoneDebounced\n\t\t */\n\t\tthis._fireSelectionChangeDoneDebounced = debounce( data => this.document.fire( 'selectionChangeDone', data ), 200 );\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tobserve() {\n\t\tconst document = this.document;\n\n\t\tdocument.on( 'keydown', ( eventInfo, data ) => {\n\t\t\tconst selection = document.selection;\n\n\t\t\tif ( selection.isFake && isArrowKeyCode( data.keyCode ) && this.isEnabled ) {\n\t\t\t\t// Prevents default key down handling - no selection change will occur.\n\t\t\t\tdata.preventDefault();\n\n\t\t\t\tthis._handleSelectionMove( data.keyCode );\n\t\t\t}\n\t\t}, { priority: 'lowest' } );\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tdestroy() {\n\t\tsuper.destroy();\n\n\t\tthis._fireSelectionChangeDoneDebounced.cancel();\n\t}\n\n\t/**\n\t * Handles collapsing view selection according to given key code. If left or up key is provided - new selection will be\n\t * collapsed to left. If right or down key is pressed - new selection will be collapsed to right.\n\t *\n\t * This method fires {@link module:engine/view/document~Document#event:selectionChange} and\n\t * {@link module:engine/view/document~Document#event:selectionChangeDone} events imitating behaviour of\n\t * {@link module:engine/view/observer/selectionobserver~SelectionObserver}.\n\t *\n\t * @private\n\t * @param {Number} keyCode\n\t * @fires module:engine/view/document~Document#event:selectionChange\n\t * @fires module:engine/view/document~Document#event:selectionChangeDone\n\t */\n\t_handleSelectionMove( keyCode ) {\n\t\tconst selection = this.document.selection;\n\t\tconst newSelection = new ViewSelection( selection.getRanges(), { backward: selection.isBackward, fake: false } );\n\n\t\t// Left or up arrow pressed - move selection to start.\n\t\tif ( keyCode == keyCodes.arrowleft || keyCode == keyCodes.arrowup ) {\n\t\t\tnewSelection.setTo( newSelection.getFirstPosition() );\n\t\t}\n\n\t\t// Right or down arrow pressed - move selection to end.\n\t\tif ( keyCode == keyCodes.arrowright || keyCode == keyCodes.arrowdown ) {\n\t\t\tnewSelection.setTo( newSelection.getLastPosition() );\n\t\t}\n\n\t\tconst data = {\n\t\t\toldSelection: selection,\n\t\t\tnewSelection,\n\t\t\tdomSelection: null\n\t\t};\n\n\t\t// Fire dummy selection change event.\n\t\tthis.document.fire( 'selectionChange', data );\n\n\t\t// Call` #_fireSelectionChangeDoneDebounced` every time when `selectionChange` event is fired.\n\t\t// This function is debounced what means that `selectionChangeDone` event will be fired only when\n\t\t// defined int the function time will elapse since the last time the function was called.\n\t\t// So `selectionChangeDone` will be fired when selection will stop changing.\n\t\tthis._fireSelectionChangeDoneDebounced( data );\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module engine/view/observer/selectionobserver\n */\n\n/* global setInterval, clearInterval */\n\nimport Observer from './observer';\nimport MutationObserver from './mutationobserver';\nimport { debounce } from 'lodash-es';\n\n/**\n * Selection observer class observes selection changes in the document. If a selection changes on the document this\n * observer checks if there are any mutations and if the DOM selection is different from the\n * {@link module:engine/view/document~Document#selection view selection}. The selection observer fires\n * {@link module:engine/view/document~Document#event:selectionChange} event only if a selection change was the only change in the document\n * and the DOM selection is different then the view selection.\n *\n * Note that this observer is attached by the {@link module:engine/view/view~View} and is available by default.\n *\n * @see module:engine/view/observer/mutationobserver~MutationObserver\n * @extends module:engine/view/observer/observer~Observer\n */\nexport default class SelectionObserver extends Observer {\n\tconstructor( view ) {\n\t\tsuper( view );\n\n\t\t/**\n\t\t * Instance of the mutation observer. Selection observer calls\n\t\t * {@link module:engine/view/observer/mutationobserver~MutationObserver#flush} to ensure that the mutations will be handled\n\t\t * before the {@link module:engine/view/document~Document#event:selectionChange} event is fired.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:engine/view/observer/mutationobserver~MutationObserver}\n\t\t * module:engine/view/observer/selectionobserver~SelectionObserver#mutationObserver\n\t\t */\n\t\tthis.mutationObserver = view.getObserver( MutationObserver );\n\n\t\t/**\n\t\t * Reference to the view {@link module:engine/view/documentselection~DocumentSelection} object used to compare\n\t\t * new selection with it.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:engine/view/documentselection~DocumentSelection}\n\t\t * module:engine/view/observer/selectionobserver~SelectionObserver#selection\n\t\t */\n\t\tthis.selection = this.document.selection;\n\n\t\t/* eslint-disable max-len */\n\t\t/**\n\t\t * Reference to the {@link module:engine/view/view~View#domConverter}.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:engine/view/domconverter~DomConverter} module:engine/view/observer/selectionobserver~SelectionObserver#domConverter\n\t\t */\n\t\t/* eslint-enable max-len */\n\t\tthis.domConverter = view.domConverter;\n\n\t\t/**\n\t\t * A set of documents which have added `selectionchange` listener to avoid adding a listener twice to the same\n\t\t * document.\n\t\t *\n\t\t * @private\n\t\t * @member {WeakSet.<Document>} module:engine/view/observer/selectionobserver~SelectionObserver#_documents\n\t\t */\n\t\tthis._documents = new WeakSet();\n\n\t\t/**\n\t\t * Fires debounced event `selectionChangeDone`. It uses `lodash#debounce` method to delay function call.\n\t\t *\n\t\t * @private\n\t\t * @param {Object} data Selection change data.\n\t\t * @method #_fireSelectionChangeDoneDebounced\n\t\t */\n\t\tthis._fireSelectionChangeDoneDebounced = debounce( data => this.document.fire( 'selectionChangeDone', data ), 200 );\n\n\t\tthis._clearInfiniteLoopInterval = setInterval( () => this._clearInfiniteLoop(), 1000 );\n\n\t\t/**\n\t\t * Private property to check if the code does not enter infinite loop.\n\t\t *\n\t\t * @private\n\t\t * @member {Number} module:engine/view/observer/selectionobserver~SelectionObserver#_loopbackCounter\n\t\t */\n\t\tthis._loopbackCounter = 0;\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tobserve( domElement ) {\n\t\tconst domDocument = domElement.ownerDocument;\n\n\t\t// Add listener once per each document.\n\t\tif ( this._documents.has( domDocument ) ) {\n\t\t\treturn;\n\t\t}\n\n\t\tthis.listenTo( domDocument, 'selectionchange', ( evt, domEvent ) => {\n\t\t\tthis._handleSelectionChange( domEvent, domDocument );\n\t\t} );\n\n\t\tthis._documents.add( domDocument );\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tdestroy() {\n\t\tsuper.destroy();\n\n\t\tclearInterval( this._clearInfiniteLoopInterval );\n\t\tthis._fireSelectionChangeDoneDebounced.cancel();\n\t}\n\n\t/**\n\t * Selection change listener. {@link module:engine/view/observer/mutationobserver~MutationObserver#flush Flush} mutations, check if\n\t * a selection changes and fires {@link module:engine/view/document~Document#event:selectionChange} event on every change\n\t * and {@link module:engine/view/document~Document#event:selectionChangeDone} when a selection stop changing.\n\t *\n\t * @private\n\t * @param {Event} domEvent DOM event.\n\t * @param {Document} domDocument DOM document.\n\t */\n\t_handleSelectionChange( domEvent, domDocument ) {\n\t\tif ( !this.isEnabled ) {\n\t\t\treturn;\n\t\t}\n\n\t\tconst domSelection = domDocument.defaultView.getSelection();\n\n\t\tif ( this.checkShouldIgnoreEventFromTarget( domSelection.anchorNode ) ) {\n\t\t\treturn;\n\t\t}\n\n\t\t// Ensure the mutation event will be before selection event on all browsers.\n\t\tthis.mutationObserver.flush();\n\n\t\t// If there were mutations then the view will be re-rendered by the mutation observer and the selection\n\t\t// will be updated, so the selections will equal and the event will not be fired, as expected.\n\t\tconst newViewSelection = this.domConverter.domSelectionToView( domSelection );\n\n\t\t// Do not convert selection change if the new view selection has no ranges in it.\n\t\t//\n\t\t// It means that the DOM selection is in some way incorrect. Ranges that were in the DOM selection could not be\n\t\t// converted to the view. This happens when the DOM selection was moved outside of the editable element.\n\t\tif ( newViewSelection.rangeCount == 0 ) {\n\t\t\tthis.view.hasDomSelection = false;\n\n\t\t\treturn;\n\t\t}\n\n\t\tthis.view.hasDomSelection = true;\n\n\t\tif ( this.selection.isEqual( newViewSelection ) && this.domConverter.isDomSelectionCorrect( domSelection ) ) {\n\t\t\treturn;\n\t\t}\n\n\t\t// Ensure we are not in the infinite loop (#400).\n\t\t// This counter is reset each second. 60 selection changes in 1 second is enough high number\n\t\t// to be very difficult (impossible) to achieve using just keyboard keys (during normal editor use).\n\t\tif ( ++this._loopbackCounter > 60 ) {\n\t\t\t// Selection change observer detected an infinite rendering loop.\n\t\t\t// Most probably you try to put the selection in the position which is not allowed\n\t\t\t// by the browser and browser fixes it automatically what causes `selectionchange` event on\n\t\t\t// which a loopback through a model tries to re-render the wrong selection and again.\n\t\t\t//\n\t\t\t// @if CK_DEBUG // console.warn( 'Selection change observer detected an infinite rendering loop.' );\n\n\t\t\treturn;\n\t\t}\n\n\t\tif ( this.selection.isSimilar( newViewSelection ) ) {\n\t\t\t// If selection was equal and we are at this point of algorithm, it means that it was incorrect.\n\t\t\t// Just re-render it, no need to fire any events, etc.\n\t\t\tthis.view.forceRender();\n\t\t} else {\n\t\t\tconst data = {\n\t\t\t\toldSelection: this.selection,\n\t\t\t\tnewSelection: newViewSelection,\n\t\t\t\tdomSelection\n\t\t\t};\n\n\t\t\t// Prepare data for new selection and fire appropriate events.\n\t\t\tthis.document.fire( 'selectionChange', data );\n\n\t\t\t// Call `#_fireSelectionChangeDoneDebounced` every time when `selectionChange` event is fired.\n\t\t\t// This function is debounced what means that `selectionChangeDone` event will be fired only when\n\t\t\t// defined int the function time will elapse since the last time the function was called.\n\t\t\t// So `selectionChangeDone` will be fired when selection will stop changing.\n\t\t\tthis._fireSelectionChangeDoneDebounced( data );\n\t\t}\n\t}\n\n\t/**\n\t * Clears `SelectionObserver` internal properties connected with preventing infinite loop.\n\t *\n\t * @protected\n\t */\n\t_clearInfiniteLoop() {\n\t\tthis._loopbackCounter = 0;\n\t}\n}\n\n/**\n * Fired when a selection has changed. This event is fired only when the selection change was the only change that happened\n * in the document, and the old selection is different then the new selection.\n *\n * Introduced by {@link module:engine/view/observer/selectionobserver~SelectionObserver}.\n *\n * Note that because {@link module:engine/view/observer/selectionobserver~SelectionObserver} is attached by the\n * {@link module:engine/view/view~View} this event is available by default.\n *\n * @see module:engine/view/observer/selectionobserver~SelectionObserver\n * @event module:engine/view/document~Document#event:selectionChange\n * @param {Object} data\n * @param {module:engine/view/documentselection~DocumentSelection} data.oldSelection Old View selection which is\n * {@link module:engine/view/document~Document#selection}.\n * @param {module:engine/view/selection~Selection} data.newSelection New View selection which is converted DOM selection.\n * @param {Selection} data.domSelection Native DOM selection.\n */\n\n/**\n * Fired when selection stops changing.\n *\n * Introduced by {@link module:engine/view/observer/selectionobserver~SelectionObserver}.\n *\n * Note that because {@link module:engine/view/observer/selectionobserver~SelectionObserver} is attached by the\n * {@link module:engine/view/view~View} this event is available by default.\n *\n * @see module:engine/view/observer/selectionobserver~SelectionObserver\n * @event module:engine/view/document~Document#event:selectionChangeDone\n * @param {Object} data\n * @param {module:engine/view/documentselection~DocumentSelection} data.oldSelection Old View selection which is\n * {@link module:engine/view/document~Document#selection}.\n * @param {module:engine/view/selection~Selection} data.newSelection New View selection which is converted DOM selection.\n * @param {Selection} data.domSelection Native DOM selection.\n */\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module engine/view/observer/focusobserver\n */\n\n/* globals setTimeout, clearTimeout */\n\nimport DomEventObserver from './domeventobserver';\n\n/**\n * {@link module:engine/view/document~Document#event:focus Focus}\n * and {@link module:engine/view/document~Document#event:blur blur} events observer.\n * Focus observer handle also {@link module:engine/view/rooteditableelement~RootEditableElement#isFocused isFocused} property of the\n * {@link module:engine/view/rooteditableelement~RootEditableElement root elements}.\n *\n * Note that this observer is attached by the {@link module:engine/view/view~View} and is available by default.\n *\n * @extends module:engine/view/observer/domeventobserver~DomEventObserver\n */\nexport default class FocusObserver extends DomEventObserver {\n\tconstructor( view ) {\n\t\tsuper( view );\n\n\t\tthis.domEventType = [ 'focus', 'blur' ];\n\t\tthis.useCapture = true;\n\t\tconst document = this.document;\n\n\t\tdocument.on( 'focus', () => {\n\t\t\tdocument.isFocused = true;\n\n\t\t\t// Unfortunately native `selectionchange` event is fired asynchronously.\n\t\t\t// We need to wait until `SelectionObserver` handle the event and then render. Otherwise rendering will\n\t\t\t// overwrite new DOM selection with selection from the view.\n\t\t\t// See https://github.com/ckeditor/ckeditor5-engine/issues/795 for more details.\n\t\t\t// Long timeout is needed to solve #676 and https://github.com/ckeditor/ckeditor5-engine/issues/1157 issues.\n\t\t\tthis._renderTimeoutId = setTimeout( () => view.forceRender(), 50 );\n\t\t} );\n\n\t\tdocument.on( 'blur', ( evt, data ) => {\n\t\t\tconst selectedEditable = document.selection.editableElement;\n\n\t\t\tif ( selectedEditable === null || selectedEditable === data.target ) {\n\t\t\t\tdocument.isFocused = false;\n\n\t\t\t\t// Re-render the document to update view elements.\n\t\t\t\tview.forceRender();\n\t\t\t}\n\t\t} );\n\n\t\t/**\n\t\t * Identifier of the timeout currently used by focus listener to delay rendering execution.\n\t\t *\n\t\t * @private\n\t\t * @member {Number} #_renderTimeoutId\n\t\t */\n\t}\n\n\tonDomEvent( domEvent ) {\n\t\tthis.fire( domEvent.type, domEvent );\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tdestroy() {\n\t\tif ( this._renderTimeoutId ) {\n\t\t\tclearTimeout( this._renderTimeoutId );\n\t\t}\n\n\t\tsuper.destroy();\n\t}\n}\n\n/**\n * Fired when one of the editables gets focus.\n *\n * Introduced by {@link module:engine/view/observer/focusobserver~FocusObserver}.\n *\n * Note that because {@link module:engine/view/observer/focusobserver~FocusObserver} is attached by the\n * {@link module:engine/view/view~View} this event is available by default.\n *\n * @see module:engine/view/observer/focusobserver~FocusObserver\n * @event module:engine/view/document~Document#event:focus\n * @param {module:engine/view/observer/domeventdata~DomEventData} data Event data.\n */\n\n/**\n * Fired when one of the editables loses focus.\n *\n * Introduced by {@link module:engine/view/observer/focusobserver~FocusObserver}.\n *\n * Note that because {@link module:engine/view/observer/focusobserver~FocusObserver} is attached by the\n * {@link module:engine/view/view~View} this event is available by default.\n *\n * @see module:engine/view/observer/focusobserver~FocusObserver\n * @event module:engine/view/document~Document#event:blur\n * @param {module:engine/view/observer/domeventdata~DomEventData} data Event data.\n */\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module engine/view/observer/compositionobserver\n */\n\nimport DomEventObserver from './domeventobserver';\n\n/**\n * {@link module:engine/view/document~Document#event:compositionstart Compositionstart},\n * {@link module:engine/view/document~Document#event:compositionupdate compositionupdate} and\n * {@link module:engine/view/document~Document#event:compositionend compositionend} events observer.\n *\n * Note that this observer is attached by the {@link module:engine/view/view~View} and is available by default.\n *\n * @extends module:engine/view/observer/domeventobserver~DomEventObserver\n */\nexport default class CompositionObserver extends DomEventObserver {\n\tconstructor( view ) {\n\t\tsuper( view );\n\n\t\tthis.domEventType = [ 'compositionstart', 'compositionupdate', 'compositionend' ];\n\t\tconst document = this.document;\n\n\t\tdocument.on( 'compositionstart', () => {\n\t\t\tdocument.isComposing = true;\n\t\t} );\n\n\t\tdocument.on( 'compositionend', () => {\n\t\t\tdocument.isComposing = false;\n\t\t} );\n\t}\n\n\tonDomEvent( domEvent ) {\n\t\tthis.fire( domEvent.type, domEvent );\n\t}\n}\n\n/**\n * Fired when composition starts inside one of the editables.\n *\n * Introduced by {@link module:engine/view/observer/compositionobserver~CompositionObserver}.\n *\n * Note that because {@link module:engine/view/observer/compositionobserver~CompositionObserver} is attached by the\n * {@link module:engine/view/view~View} this event is available by default.\n *\n * @see module:engine/view/observer/compositionobserver~CompositionObserver\n * @event module:engine/view/document~Document#event:compositionstart\n * @param {module:engine/view/observer/domeventdata~DomEventData} data Event data.\n */\n\n/**\n * Fired when composition is updated inside one of the editables.\n *\n * Introduced by {@link module:engine/view/observer/compositionobserver~CompositionObserver}.\n *\n * Note that because {@link module:engine/view/observer/compositionobserver~CompositionObserver} is attached by the\n * {@link module:engine/view/view~View} this event is available by default.\n *\n * @see module:engine/view/observer/compositionobserver~CompositionObserver\n * @event module:engine/view/document~Document#event:compositionupdate\n * @param {module:engine/view/observer/domeventdata~DomEventData} data Event data.\n */\n\n/**\n * Fired when composition ends inside one of the editables.\n *\n * Introduced by {@link module:engine/view/observer/compositionobserver~CompositionObserver}.\n *\n * Note that because {@link module:engine/view/observer/compositionobserver~CompositionObserver} is attached by the\n * {@link module:engine/view/view~View} this event is available by default.\n *\n * @see module:engine/view/observer/compositionobserver~CompositionObserver\n * @event module:engine/view/document~Document#event:compositionend\n * @param {module:engine/view/observer/domeventdata~DomEventData} data Event data.\n */\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module engine/view/observer/inputobserver\n */\n\nimport DomEventObserver from './domeventobserver';\n\n/**\n * Observer for events connected with data input.\n *\n * Note that this observer is attached by the {@link module:engine/view/view~View} and is available by default.\n *\n * @extends module:engine/view/observer/domeventobserver~DomEventObserver\n */\nexport default class InputObserver extends DomEventObserver {\n\tconstructor( view ) {\n\t\tsuper( view );\n\n\t\tthis.domEventType = [ 'beforeinput' ];\n\t}\n\n\tonDomEvent( domEvent ) {\n\t\tthis.fire( domEvent.type, domEvent );\n\t}\n}\n\n/**\n * Fired before browser inputs (or deletes) some data.\n *\n * This event is available only on browsers which support DOM `beforeinput` event.\n *\n * Introduced by {@link module:engine/view/observer/inputobserver~InputObserver}.\n *\n * Note that because {@link module:engine/view/observer/inputobserver~InputObserver} is attached by the\n * {@link module:engine/view/view~View} this event is available by default.\n *\n * @see module:engine/view/observer/inputobserver~InputObserver\n * @event module:engine/view/document~Document#event:beforeinput\n * @param {module:engine/view/observer/domeventdata~DomEventData} data Event data.\n */\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module utils/dom/isrange\n */\n\n/**\n * Checks if the object is a native DOM Range.\n *\n * @param {*} obj\n * @returns {Boolean}\n */\nexport default function isRange( obj ) {\n\treturn Object.prototype.toString.apply( obj ) == '[object Range]';\n}\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module utils/dom/getborderwidths\n */\n\n/**\n * Returns an object containing CSS border widths of a specified HTML element.\n *\n * @param {HTMLElement} element An element which has CSS borders.\n * @returns {Object} An object containing `top`, `left`, `right` and `bottom` properties\n * with numerical values of the `border-[top,left,right,bottom]-width` CSS styles.\n */\nexport default function getBorderWidths( element ) {\n\t// Call getComputedStyle on the window the element document belongs to.\n\tconst style = element.ownerDocument.defaultView.getComputedStyle( element );\n\n\treturn {\n\t\ttop: parseInt( style.borderTopWidth, 10 ),\n\t\tright: parseInt( style.borderRightWidth, 10 ),\n\t\tbottom: parseInt( style.borderBottomWidth, 10 ),\n\t\tleft: parseInt( style.borderLeftWidth, 10 )\n\t};\n}\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module utils/dom/rect\n */\n\nimport isRange from './isrange';\nimport isWindow from './iswindow';\nimport getBorderWidths from './getborderwidths';\nimport isText from './istext';\nimport { isElement } from 'lodash-es';\n\nconst rectProperties = [ 'top', 'right', 'bottom', 'left', 'width', 'height' ];\n\n/**\n * A helper class representing a `ClientRect` object, e.g. value returned by\n * the native `object.getBoundingClientRect()` method. Provides a set of methods\n * to manipulate the rect and compare it against other rect instances.\n */\nexport default class Rect {\n\t/**\n\t * Creates an instance of rect.\n\t *\n\t *\t\t// Rect of an HTMLElement.\n\t *\t\tconst rectA = new Rect( document.body );\n\t *\n\t *\t\t// Rect of a DOM Range.\n\t *\t\tconst rectB = new Rect( document.getSelection().getRangeAt( 0 ) );\n\t *\n\t *\t\t// Rect of a window (web browser viewport).\n\t *\t\tconst rectC = new Rect( window );\n\t *\n\t *\t\t// Rect out of an object.\n\t *\t\tconst rectD = new Rect( { top: 0, right: 10, bottom: 10, left: 0, width: 10, height: 10 } );\n\t *\n\t *\t\t// Rect out of another Rect instance.\n\t *\t\tconst rectE = new Rect( rectD );\n\t *\n\t *\t\t// Rect out of a ClientRect.\n\t *\t\tconst rectF = new Rect( document.body.getClientRects().item( 0 ) );\n\t *\n\t * **Note**: By default a rect of an HTML element includes its CSS borders and scrollbars (if any)\n\t * ant the rect of a `window` includes scrollbars too. Use {@link #excludeScrollbarsAndBorders}\n\t * to get the inner part of the rect.\n\t *\n\t * @param {HTMLElement|Range|Window|ClientRect|module:utils/dom/rect~Rect|Object} source A source object to create the rect.\n\t */\n\tconstructor( source ) {\n\t\tconst isSourceRange = isRange( source );\n\n\t\t/**\n\t\t * The object this rect is for.\n\t\t *\n\t\t * @protected\n\t\t * @readonly\n\t\t * @member {HTMLElement|Range|ClientRect|module:utils/dom/rect~Rect|Object} #_source\n\t\t */\n\t\tObject.defineProperty( this, '_source', {\n\t\t\t// If the source is a Rect instance, copy it's #_source.\n\t\t\tvalue: source._source || source,\n\t\t\twritable: true,\n\t\t\tenumerable: false\n\t\t} );\n\n\t\tif ( isElement( source ) || isSourceRange ) {\n\t\t\t// The `Rect` class depends on `getBoundingClientRect` and `getClientRects` DOM methods. If the source\n\t\t\t// of a rect in an HTML element or a DOM range but it does not belong to any rendered DOM tree, these methods\n\t\t\t// will fail to obtain the geometry and the rect instance makes little sense to the features using it.\n\t\t\t// To get rid of this warning make sure the source passed to the constructor is a descendant of `window.document.body`.\n\t\t\t// @if CK_DEBUG // const sourceNode = isSourceRange ? source.startContainer : source;\n\t\t\t// @if CK_DEBUG // if ( !sourceNode.ownerDocument || !sourceNode.ownerDocument.body.contains( sourceNode ) ) {\n\t\t\t// @if CK_DEBUG // \tconsole.warn(\n\t\t\t// @if CK_DEBUG // \t\t'rect-source-not-in-dom: The source of this rect does not belong to any rendered DOM tree.',\n\t\t\t// @if CK_DEBUG // \t\t{ source } );\n\t\t\t// @if CK_DEBUG // }\n\n\t\t\tif ( isSourceRange ) {\n\t\t\t\tconst rangeRects = Rect.getDomRangeRects( source );\n\t\t\t\tcopyRectProperties( this, Rect.getBoundingRect( rangeRects ) );\n\t\t\t} else {\n\t\t\t\tcopyRectProperties( this, source.getBoundingClientRect() );\n\t\t\t}\n\t\t} else if ( isWindow( source ) ) {\n\t\t\tconst { innerWidth, innerHeight } = source;\n\n\t\t\tcopyRectProperties( this, {\n\t\t\t\ttop: 0,\n\t\t\t\tright: innerWidth,\n\t\t\t\tbottom: innerHeight,\n\t\t\t\tleft: 0,\n\t\t\t\twidth: innerWidth,\n\t\t\t\theight: innerHeight\n\t\t\t} );\n\t\t} else {\n\t\t\tcopyRectProperties( this, source );\n\t\t}\n\n\t\t/**\n\t\t * The \"top\" value of the rect.\n\t\t *\n\t\t * @readonly\n\t\t * @member {Number} #top\n\t\t */\n\n\t\t/**\n\t\t * The \"right\" value of the rect.\n\t\t *\n\t\t * @readonly\n\t\t * @member {Number} #right\n\t\t */\n\n\t\t/**\n\t\t * The \"bottom\" value of the rect.\n\t\t *\n\t\t * @readonly\n\t\t * @member {Number} #bottom\n\t\t */\n\n\t\t/**\n\t\t * The \"left\" value of the rect.\n\t\t *\n\t\t * @readonly\n\t\t * @member {Number} #left\n\t\t */\n\n\t\t/**\n\t\t * The \"width\" value of the rect.\n\t\t *\n\t\t * @readonly\n\t\t * @member {Number} #width\n\t\t */\n\n\t\t/**\n\t\t * The \"height\" value of the rect.\n\t\t *\n\t\t * @readonly\n\t\t * @member {Number} #height\n\t\t */\n\t}\n\n\t/**\n\t * Returns a clone of the rect.\n\t *\n\t * @returns {module:utils/dom/rect~Rect} A cloned rect.\n\t */\n\tclone() {\n\t\treturn new Rect( this );\n\t}\n\n\t/**\n\t * Moves the rect so that its upper–left corner lands in desired `[ x, y ]` location.\n\t *\n\t * @param {Number} x Desired horizontal location.\n\t * @param {Number} y Desired vertical location.\n\t * @returns {module:utils/dom/rect~Rect} A rect which has been moved.\n\t */\n\tmoveTo( x, y ) {\n\t\tthis.top = y;\n\t\tthis.right = x + this.width;\n\t\tthis.bottom = y + this.height;\n\t\tthis.left = x;\n\n\t\treturn this;\n\t}\n\n\t/**\n\t * Moves the rect in–place by a dedicated offset.\n\t *\n\t * @param {Number} x A horizontal offset.\n\t * @param {Number} y A vertical offset\n\t * @returns {module:utils/dom/rect~Rect} A rect which has been moved.\n\t */\n\tmoveBy( x, y ) {\n\t\tthis.top += y;\n\t\tthis.right += x;\n\t\tthis.left += x;\n\t\tthis.bottom += y;\n\n\t\treturn this;\n\t}\n\n\t/**\n\t * Returns a new rect a a result of intersection with another rect.\n\t *\n\t * @param {module:utils/dom/rect~Rect} anotherRect\n\t * @returns {module:utils/dom/rect~Rect}\n\t */\n\tgetIntersection( anotherRect ) {\n\t\tconst rect = {\n\t\t\ttop: Math.max( this.top, anotherRect.top ),\n\t\t\tright: Math.min( this.right, anotherRect.right ),\n\t\t\tbottom: Math.min( this.bottom, anotherRect.bottom ),\n\t\t\tleft: Math.max( this.left, anotherRect.left )\n\t\t};\n\n\t\trect.width = rect.right - rect.left;\n\t\trect.height = rect.bottom - rect.top;\n\n\t\tif ( rect.width < 0 || rect.height < 0 ) {\n\t\t\treturn null;\n\t\t} else {\n\t\t\treturn new Rect( rect );\n\t\t}\n\t}\n\n\t/**\n\t * Returns the area of intersection with another rect.\n\t *\n\t * @param {module:utils/dom/rect~Rect} anotherRect [description]\n\t * @returns {Number} Area of intersection.\n\t */\n\tgetIntersectionArea( anotherRect ) {\n\t\tconst rect = this.getIntersection( anotherRect );\n\n\t\tif ( rect ) {\n\t\t\treturn rect.getArea();\n\t\t} else {\n\t\t\treturn 0;\n\t\t}\n\t}\n\n\t/**\n\t * Returns the area of the rect.\n\t *\n\t * @returns {Number}\n\t */\n\tgetArea() {\n\t\treturn this.width * this.height;\n\t}\n\n\t/**\n\t * Returns a new rect, a part of the original rect, which is actually visible to the user,\n\t * e.g. an original rect cropped by parent element rects which have `overflow` set in CSS\n\t * other than `\"visible\"`.\n\t *\n\t * If there's no such visible rect, which is when the rect is limited by one or many of\n\t * the ancestors, `null` is returned.\n\t *\n\t * @returns {module:utils/dom/rect~Rect|null} A visible rect instance or `null`, if there's none.\n\t */\n\tgetVisible() {\n\t\tconst source = this._source;\n\t\tlet visibleRect = this.clone();\n\n\t\t// There's no ancestor to crop <body> with the overflow.\n\t\tif ( !isBody( source ) ) {\n\t\t\tlet parent = source.parentNode || source.commonAncestorContainer;\n\n\t\t\t// Check the ancestors all the way up to the <body>.\n\t\t\twhile ( parent && !isBody( parent ) ) {\n\t\t\t\tconst parentRect = new Rect( parent );\n\t\t\t\tconst intersectionRect = visibleRect.getIntersection( parentRect );\n\n\t\t\t\tif ( intersectionRect ) {\n\t\t\t\t\tif ( intersectionRect.getArea() < visibleRect.getArea() ) {\n\t\t\t\t\t\t// Reduce the visible rect to the intersection.\n\t\t\t\t\t\tvisibleRect = intersectionRect;\n\t\t\t\t\t}\n\t\t\t\t} else {\n\t\t\t\t\t// There's no intersection, the rect is completely invisible.\n\t\t\t\t\treturn null;\n\t\t\t\t}\n\n\t\t\t\tparent = parent.parentNode;\n\t\t\t}\n\t\t}\n\n\t\treturn visibleRect;\n\t}\n\n\t/**\n\t * Checks if all property values ({@link #top}, {@link #left}, {@link #right},\n\t * {@link #bottom}, {@link #width} and {@link #height}) are the equal in both rect\n\t * instances.\n\t *\n\t * @param {module:utils/dom/rect~Rect} rect A rect instance to compare with.\n\t * @returns {Boolean} `true` when Rects are equal. `false` otherwise.\n\t */\n\tisEqual( anotherRect ) {\n\t\tfor ( const prop of rectProperties ) {\n\t\t\tif ( this[ prop ] !== anotherRect[ prop ] ) {\n\t\t\t\treturn false;\n\t\t\t}\n\t\t}\n\n\t\treturn true;\n\t}\n\n\t/**\n\t * Checks whether a rect fully contains another rect instance.\n\t *\n\t * @param {module:utils/dom/rect~Rect} anotherRect\n\t * @returns {Boolean} `true` if contains, `false` otherwise.\n\t */\n\tcontains( anotherRect ) {\n\t\tconst intersectRect = this.getIntersection( anotherRect );\n\n\t\treturn !!( intersectRect && intersectRect.isEqual( anotherRect ) );\n\t}\n\n\t/**\n\t * Excludes scrollbars and CSS borders from the rect.\n\t *\n\t * * Borders are removed when {@link #_source} is an HTML element.\n\t * * Scrollbars are excluded from HTML elements and the `window`.\n\t *\n\t * @returns {module:utils/dom/rect~Rect} A rect which has been updated.\n\t */\n\texcludeScrollbarsAndBorders() {\n\t\tconst source = this._source;\n\t\tlet scrollBarWidth, scrollBarHeight, direction;\n\n\t\tif ( isWindow( source ) ) {\n\t\t\tscrollBarWidth = source.innerWidth - source.document.documentElement.clientWidth;\n\t\t\tscrollBarHeight = source.innerHeight - source.document.documentElement.clientHeight;\n\t\t\tdirection = source.getComputedStyle( source.document.documentElement ).direction;\n\t\t} else {\n\t\t\tconst borderWidths = getBorderWidths( this._source );\n\n\t\t\tscrollBarWidth = source.offsetWidth - source.clientWidth - borderWidths.left - borderWidths.right;\n\t\t\tscrollBarHeight = source.offsetHeight - source.clientHeight - borderWidths.top - borderWidths.bottom;\n\t\t\tdirection = source.ownerDocument.defaultView.getComputedStyle( source ).direction;\n\n\t\t\tthis.left += borderWidths.left;\n\t\t\tthis.top += borderWidths.top;\n\t\t\tthis.right -= borderWidths.right;\n\t\t\tthis.bottom -= borderWidths.bottom;\n\t\t\tthis.width = this.right - this.left;\n\t\t\tthis.height = this.bottom - this.top;\n\t\t}\n\n\t\tthis.width -= scrollBarWidth;\n\n\t\tif ( direction === 'ltr' ) {\n\t\t\tthis.right -= scrollBarWidth;\n\t\t} else {\n\t\t\tthis.left += scrollBarWidth;\n\t\t}\n\n\t\tthis.height -= scrollBarHeight;\n\t\tthis.bottom -= scrollBarHeight;\n\n\t\treturn this;\n\t}\n\n\t/**\n\t * Returns an array of rects of the given native DOM Range.\n\t *\n\t * @param {Range} range A native DOM range.\n\t * @returns {Array.<module:utils/dom/rect~Rect>} DOM Range rects.\n\t */\n\tstatic getDomRangeRects( range ) {\n\t\tconst rects = [];\n\t\t// Safari does not iterate over ClientRectList using for...of loop.\n\t\tconst clientRects = Array.from( range.getClientRects() );\n\n\t\tif ( clientRects.length ) {\n\t\t\tfor ( const rect of clientRects ) {\n\t\t\t\trects.push( new Rect( rect ) );\n\t\t\t}\n\t\t}\n\t\t// If there's no client rects for the Range, use parent container's bounding rect\n\t\t// instead and adjust rect's width to simulate the actual geometry of such range.\n\t\t// https://github.com/ckeditor/ckeditor5-utils/issues/153\n\t\t// https://github.com/ckeditor/ckeditor5-ui/issues/317\n\t\telse {\n\t\t\tlet startContainer = range.startContainer;\n\n\t\t\tif ( isText( startContainer ) ) {\n\t\t\t\tstartContainer = startContainer.parentNode;\n\t\t\t}\n\n\t\t\tconst rect = new Rect( startContainer.getBoundingClientRect() );\n\t\t\trect.right = rect.left;\n\t\t\trect.width = 0;\n\n\t\t\trects.push( rect );\n\t\t}\n\n\t\treturn rects;\n\t}\n\n\t/**\n\t * Returns a bounding rectangle that contains all the given `rects`.\n\t *\n\t * @param {Iterable.<module:utils/dom/rect~Rect>} rects A list of rectangles that should be contained in the result rectangle.\n\t * @returns {module:utils/dom/rect~Rect|null} Bounding rectangle or `null` if no `rects` were given.\n\t */\n\tstatic getBoundingRect( rects ) {\n\t\tconst boundingRectData = {\n\t\t\tleft: Number.POSITIVE_INFINITY,\n\t\t\ttop: Number.POSITIVE_INFINITY,\n\t\t\tright: Number.NEGATIVE_INFINITY,\n\t\t\tbottom: Number.NEGATIVE_INFINITY\n\t\t};\n\t\tlet rectangleCount = 0;\n\n\t\tfor ( const rect of rects ) {\n\t\t\trectangleCount++;\n\n\t\t\tboundingRectData.left = Math.min( boundingRectData.left, rect.left );\n\t\t\tboundingRectData.top = Math.min( boundingRectData.top, rect.top );\n\t\t\tboundingRectData.right = Math.max( boundingRectData.right, rect.right );\n\t\t\tboundingRectData.bottom = Math.max( boundingRectData.bottom, rect.bottom );\n\t\t}\n\n\t\tif ( rectangleCount == 0 ) {\n\t\t\treturn null;\n\t\t}\n\n\t\tboundingRectData.width = boundingRectData.right - boundingRectData.left;\n\t\tboundingRectData.height = boundingRectData.bottom - boundingRectData.top;\n\n\t\treturn new Rect( boundingRectData );\n\t}\n}\n\n// Acquires all the rect properties from the passed source.\n//\n// @private\n// @param {module:utils/dom/rect~Rect} rect\n// @param {ClientRect|module:utils/dom/rect~Rect|Object} source\nfunction copyRectProperties( rect, source ) {\n\tfor ( const p of rectProperties ) {\n\t\trect[ p ] = source[ p ];\n\t}\n}\n\n// Checks if provided object is a <body> HTML element.\n//\n// @private\n// @param {HTMLElement|Range} elementOrRange\n// @returns {Boolean}\nfunction isBody( elementOrRange ) {\n\tif ( !isElement( elementOrRange ) ) {\n\t\treturn false;\n\t}\n\n\treturn elementOrRange === elementOrRange.ownerDocument.body;\n}\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module utils/dom/scroll\n */\n\nimport isRange from './isrange';\nimport Rect from './rect';\nimport isText from './istext';\n\nconst utils = {};\n\n/**\n * Makes any page `HTMLElement` or `Range` (`target`) visible inside the browser viewport.\n * This helper will scroll all `target` ancestors and the web browser viewport to reveal the target to\n * the user. If the `target` is already visible, nothing will happen.\n *\n * @param {HTMLElement|Range} options.target A target, which supposed to become visible to the user.\n * @param {Number} [options.viewportOffset] An offset from the edge of the viewport (in pixels)\n * the `target` will be moved by when the viewport is scrolled. It enhances the user experience\n * by keeping the `target` some distance from the edge of the viewport and thus making it easier to\n * read or edit by the user.\n */\nexport function scrollViewportToShowTarget( { target, viewportOffset = 0 } ) {\n\tconst targetWindow = getWindow( target );\n\tlet currentWindow = targetWindow;\n\tlet currentFrame = null;\n\n\t// Iterate over all windows, starting from target's parent window up to window#top.\n\twhile ( currentWindow ) {\n\t\tlet firstAncestorToScroll;\n\n\t\t// Let's scroll target's ancestors first to reveal it. Then, once the ancestor scrolls\n\t\t// settled down, the algorithm can eventually scroll the viewport of the current window.\n\t\t//\n\t\t// Note: If the current window is target's **original** window (e.g. the first one),\n\t\t// start scrolling the closest parent of the target. If not, scroll the closest parent\n\t\t// of an iframe that resides in the current window.\n\t\tif ( currentWindow == targetWindow ) {\n\t\t\tfirstAncestorToScroll = getParentElement( target );\n\t\t} else {\n\t\t\tfirstAncestorToScroll = getParentElement( currentFrame );\n\t\t}\n\n\t\t// Scroll the target's ancestors first. Once done, scrolling the viewport is easy.\n\t\tscrollAncestorsToShowRect( firstAncestorToScroll, () => {\n\t\t\t// Note: If the target does not belong to the current window **directly**,\n\t\t\t// i.e. it resides in an iframe belonging to the window, obtain the target's rect\n\t\t\t// in the coordinates of the current window. By default, a Rect returns geometry\n\t\t\t// relative to the current window's viewport. To make it work in a parent window,\n\t\t\t// it must be shifted.\n\t\t\treturn getRectRelativeToWindow( target, currentWindow );\n\t\t} );\n\n\t\t// Obtain the rect of the target after it has been scrolled within its ancestors.\n\t\t// It's time to scroll the viewport.\n\t\tconst targetRect = getRectRelativeToWindow( target, currentWindow );\n\n\t\tscrollWindowToShowRect( currentWindow, targetRect, viewportOffset );\n\n\t\tif ( currentWindow.parent != currentWindow ) {\n\t\t\t// Keep the reference to the <iframe> element the \"previous current window\" was\n\t\t\t// rendered within. It will be useful to re–calculate the rect of the target\n\t\t\t// in the parent window's relative geometry. The target's rect must be shifted\n\t\t\t// by it's iframe's position.\n\t\t\tcurrentFrame = currentWindow.frameElement;\n\t\t\tcurrentWindow = currentWindow.parent;\n\n\t\t\t// If the current window has some parent but frameElement is inaccessible, then they have\n\t\t\t// different domains/ports and, due to security reasons, accessing and scrolling\n\t\t\t// the parent window won't be possible.\n\t\t\t// See https://github.com/ckeditor/ckeditor5/issues/930.\n\t\t\tif ( !currentFrame ) {\n\t\t\t\treturn;\n\t\t\t}\n\t\t} else {\n\t\t\tcurrentWindow = null;\n\t\t}\n\t}\n}\n\n/**\n * Makes any page `HTMLElement` or `Range` (target) visible within its scrollable ancestors,\n * e.g. if they have `overflow: scroll` CSS style.\n *\n * @param {HTMLElement|Range} target A target, which supposed to become visible to the user.\n */\nexport function scrollAncestorsToShowTarget( target ) {\n\tconst targetParent = getParentElement( target );\n\n\tscrollAncestorsToShowRect( targetParent, () => {\n\t\treturn new Rect( target );\n\t} );\n}\n\n// TODO: Using a property value shorthand in the top of the file\n// causes JSDoc to throw errors. See https://github.com/cksource/docs-builder/issues/75.\nObject.assign( utils, {\n\tscrollViewportToShowTarget,\n\tscrollAncestorsToShowTarget\n} );\n\n// Makes a given rect visible within its parent window.\n//\n// Note: Avoid the situation where the caret is still in the viewport, but totally\n// at the edge of it. In such situation, if it moved beyond the viewport in the next\n// action e.g. after paste, the scrolling would move it to the viewportOffset level\n// and it all would look like the caret visually moved up/down:\n//\n// 1.\n//\t\t| foo[]\n//\t\t|                                    <--- N px of space below the caret\n//\t\t+---------------------------------...\n//\n// 2. *paste*\n// 3.\n//\t\t|\n//\t\t|\n//\t\t+-foo-----------------------------...\n//\t\t  bar[]                              <--- caret below viewport, scrolling...\n//\n// 4. *scrolling*\n// 5.\n//\t\t|\n//\t\t| foo\n//\t\t| bar[]                              <--- caret precisely at the edge\n//\t\t+---------------------------------...\n//\n// To prevent this, this method checks the rects moved by the viewportOffset to cover\n// the upper/lower edge of the viewport. It makes sure if the action repeats, there's\n// no twitching – it's a purely visual improvement:\n//\n// 5. (after fix)\n//\t\t|\n//\t\t| foo\n//\t\t| bar[]\n//\t\t|                                    <--- N px of space below the caret\n//\t\t+---------------------------------...\n//\n// @private\n// @param {Window} window A window which is scrolled to reveal the rect.\n// @param {module:utils/dom/rect~Rect} rect A rect which is to be revealed.\n// @param {Number} viewportOffset See scrollViewportToShowTarget.\nfunction scrollWindowToShowRect( window, rect, viewportOffset ) {\n\tconst targetShiftedDownRect = rect.clone().moveBy( 0, viewportOffset );\n\tconst targetShiftedUpRect = rect.clone().moveBy( 0, -viewportOffset );\n\tconst viewportRect = new Rect( window ).excludeScrollbarsAndBorders();\n\n\tconst rects = [ targetShiftedUpRect, targetShiftedDownRect ];\n\n\tif ( !rects.every( rect => viewportRect.contains( rect ) ) ) {\n\t\tlet { scrollX, scrollY } = window;\n\n\t\tif ( isAbove( targetShiftedUpRect, viewportRect ) ) {\n\t\t\tscrollY -= viewportRect.top - rect.top + viewportOffset;\n\t\t} else if ( isBelow( targetShiftedDownRect, viewportRect ) ) {\n\t\t\tscrollY += rect.bottom - viewportRect.bottom + viewportOffset;\n\t\t}\n\n\t\t// TODO: Web browsers scroll natively to place the target in the middle\n\t\t// of the viewport. It's not a very popular case, though.\n\t\tif ( isLeftOf( rect, viewportRect ) ) {\n\t\t\tscrollX -= viewportRect.left - rect.left + viewportOffset;\n\t\t} else if ( isRightOf( rect, viewportRect ) ) {\n\t\t\tscrollX += rect.right - viewportRect.right + viewportOffset;\n\t\t}\n\n\t\twindow.scrollTo( scrollX, scrollY );\n\t}\n}\n\n// Recursively scrolls element ancestors to visually reveal a rect.\n//\n// @private\n// @param {HTMLElement} A parent The first ancestors to start scrolling.\n// @param {Function} getRect A function which returns the Rect, which is to be revealed.\nfunction scrollAncestorsToShowRect( parent, getRect ) {\n\tconst parentWindow = getWindow( parent );\n\tlet parentRect, targetRect;\n\n\twhile ( parent != parentWindow.document.body ) {\n\t\ttargetRect = getRect();\n\t\tparentRect = new Rect( parent ).excludeScrollbarsAndBorders();\n\n\t\tif ( !parentRect.contains( targetRect ) ) {\n\t\t\tif ( isAbove( targetRect, parentRect ) ) {\n\t\t\t\tparent.scrollTop -= parentRect.top - targetRect.top;\n\t\t\t} else if ( isBelow( targetRect, parentRect ) ) {\n\t\t\t\tparent.scrollTop += targetRect.bottom - parentRect.bottom;\n\t\t\t}\n\n\t\t\tif ( isLeftOf( targetRect, parentRect ) ) {\n\t\t\t\tparent.scrollLeft -= parentRect.left - targetRect.left;\n\t\t\t} else if ( isRightOf( targetRect, parentRect ) ) {\n\t\t\t\tparent.scrollLeft += targetRect.right - parentRect.right;\n\t\t\t}\n\t\t}\n\n\t\tparent = parent.parentNode;\n\t}\n}\n\n// Determines if a given `Rect` extends beyond the bottom edge of the second `Rect`.\n//\n// @private\n// @param {module:utils/dom/rect~Rect} firstRect\n// @param {module:utils/dom/rect~Rect} secondRect\nfunction isBelow( firstRect, secondRect ) {\n\treturn firstRect.bottom > secondRect.bottom;\n}\n\n// Determines if a given `Rect` extends beyond the top edge of the second `Rect`.\n//\n// @private\n// @param {module:utils/dom/rect~Rect} firstRect\n// @param {module:utils/dom/rect~Rect} secondRect\nfunction isAbove( firstRect, secondRect ) {\n\treturn firstRect.top < secondRect.top;\n}\n\n// Determines if a given `Rect` extends beyond the left edge of the second `Rect`.\n//\n// @private\n// @param {module:utils/dom/rect~Rect} firstRect\n// @param {module:utils/dom/rect~Rect} secondRect\nfunction isLeftOf( firstRect, secondRect ) {\n\treturn firstRect.left < secondRect.left;\n}\n\n// Determines if a given `Rect` extends beyond the right edge of the second `Rect`.\n//\n// @private\n// @param {module:utils/dom/rect~Rect} firstRect\n// @param {module:utils/dom/rect~Rect} secondRect\nfunction isRightOf( firstRect, secondRect ) {\n\treturn firstRect.right > secondRect.right;\n}\n\n// Returns the closest window of an element or range.\n//\n// @private\n// @param {HTMLElement|Range} firstRect\n// @returns {Window}\nfunction getWindow( elementOrRange ) {\n\tif ( isRange( elementOrRange ) ) {\n\t\treturn elementOrRange.startContainer.ownerDocument.defaultView;\n\t} else {\n\t\treturn elementOrRange.ownerDocument.defaultView;\n\t}\n}\n\n// Returns the closest parent of an element or DOM range.\n//\n// @private\n// @param {HTMLElement|Range} firstRect\n// @returns {HTMLelement}\nfunction getParentElement( elementOrRange ) {\n\tif ( isRange( elementOrRange ) ) {\n\t\tlet parent = elementOrRange.commonAncestorContainer;\n\n\t\t// If a Range is attached to the Text, use the closest element ancestor.\n\t\tif ( isText( parent ) ) {\n\t\t\tparent = parent.parentNode;\n\t\t}\n\n\t\treturn parent;\n\t} else {\n\t\treturn elementOrRange.parentNode;\n\t}\n}\n\n// Returns the rect of an element or range residing in an iframe.\n// The result rect is relative to the geometry of the passed window instance.\n//\n// @private\n// @param {HTMLElement|Range} target Element or range which rect should be returned.\n// @param {Window} relativeWindow A window the rect should be relative to.\n// @returns {module:utils/dom/rect~Rect}\nfunction getRectRelativeToWindow( target, relativeWindow ) {\n\tconst targetWindow = getWindow( target );\n\tconst rect = new Rect( target );\n\n\tif ( targetWindow === relativeWindow ) {\n\t\treturn rect;\n\t} else {\n\t\tlet currentWindow = targetWindow;\n\n\t\twhile ( currentWindow != relativeWindow ) {\n\t\t\tconst frame = currentWindow.frameElement;\n\t\t\tconst frameRect = new Rect( frame ).excludeScrollbarsAndBorders();\n\n\t\t\trect.moveBy( frameRect.left, frameRect.top );\n\n\t\t\tcurrentWindow = currentWindow.parent;\n\t\t}\n\t}\n\n\treturn rect;\n}\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module engine/view/view\n */\n\nimport Document from './document';\nimport DowncastWriter from './downcastwriter';\nimport Renderer from './renderer';\nimport DomConverter from './domconverter';\nimport Position from './position';\nimport Range from './range';\nimport Selection from './selection';\n\nimport MutationObserver from './observer/mutationobserver';\nimport KeyObserver from './observer/keyobserver';\nimport FakeSelectionObserver from './observer/fakeselectionobserver';\nimport SelectionObserver from './observer/selectionobserver';\nimport FocusObserver from './observer/focusobserver';\nimport CompositionObserver from './observer/compositionobserver';\nimport InputObserver from './observer/inputobserver';\n\nimport ObservableMixin from '@ckeditor/ckeditor5-utils/src/observablemixin';\nimport mix from '@ckeditor/ckeditor5-utils/src/mix';\nimport { scrollViewportToShowTarget } from '@ckeditor/ckeditor5-utils/src/dom/scroll';\nimport { injectUiElementHandling } from './uielement';\nimport { injectQuirksHandling } from './filler';\nimport CKEditorError from '@ckeditor/ckeditor5-utils/src/ckeditorerror';\nimport env from '@ckeditor/ckeditor5-utils/src/env';\n\n/**\n * Editor's view controller class. Its main responsibility is DOM - View management for editing purposes, to provide\n * abstraction over the DOM structure and events and hide all browsers quirks.\n *\n * View controller renders view document to DOM whenever view structure changes. To determine when view can be rendered,\n * all changes need to be done using the {@link module:engine/view/view~View#change} method, using\n * {@link module:engine/view/downcastwriter~DowncastWriter}:\n *\n *\t\tview.change( writer => {\n *\t\t\twriter.insert( position, writer.createText( 'foo' ) );\n *\t\t} );\n *\n * View controller also register {@link module:engine/view/observer/observer~Observer observers} which observes changes\n * on DOM and fire events on the {@link module:engine/view/document~Document Document}.\n * Note that the following observers are added by the class constructor and are always available:\n *\n * * {@link module:engine/view/observer/mutationobserver~MutationObserver},\n * * {@link module:engine/view/observer/selectionobserver~SelectionObserver},\n * * {@link module:engine/view/observer/focusobserver~FocusObserver},\n * * {@link module:engine/view/observer/keyobserver~KeyObserver},\n * * {@link module:engine/view/observer/fakeselectionobserver~FakeSelectionObserver}.\n * * {@link module:engine/view/observer/compositionobserver~CompositionObserver}.\n *\n * This class also {@link module:engine/view/view~View#attachDomRoot binds the DOM and the view elements}.\n *\n * If you do not need full a DOM - view management, and only want to transform a tree of view elements to a tree of DOM\n * elements you do not need this controller. You can use the {@link module:engine/view/domconverter~DomConverter DomConverter} instead.\n *\n * @mixes module:utils/observablemixin~ObservableMixin\n */\nexport default class View {\n\t/**\n\t * @param {module:engine/view/stylesmap~StylesProcessor} stylesProcessor The styles processor instance.\n\t */\n\tconstructor( stylesProcessor ) {\n\t\t/**\n\t\t * Instance of the {@link module:engine/view/document~Document} associated with this view controller.\n\t\t *\n\t\t * @readonly\n\t\t * @type {module:engine/view/document~Document}\n\t\t */\n\t\tthis.document = new Document( stylesProcessor );\n\n\t\t/**\n\t\t * Instance of the {@link module:engine/view/domconverter~DomConverter domConverter} used by\n\t\t * {@link module:engine/view/view~View#_renderer renderer}\n\t\t * and {@link module:engine/view/observer/observer~Observer observers}.\n\t\t *\n\t\t * @readonly\n\t\t * @type {module:engine/view/domconverter~DomConverter}\n\t\t */\n\t\tthis.domConverter = new DomConverter( this.document );\n\n\t\t/**\n\t\t * Roots of the DOM tree. Map on the `HTMLElement`s with roots names as keys.\n\t\t *\n\t\t * @readonly\n\t\t * @type {Map.<String, HTMLElement>}\n\t\t */\n\t\tthis.domRoots = new Map();\n\n\t\t/**\n\t\t * Used to prevent calling {@link #forceRender} and {@link #change} during rendering view to the DOM.\n\t\t *\n\t\t * @readonly\n\t\t * @member {Boolean} #isRenderingInProgress\n\t\t */\n\t\tthis.set( 'isRenderingInProgress', false );\n\n\t\t/**\n\t\t * Informs whether the DOM selection is inside any of the DOM roots managed by the view.\n\t\t *\n\t\t * @readonly\n\t\t * @member {Boolean} #hasDomSelection\n\t\t */\n\t\tthis.set( 'hasDomSelection', false );\n\n\t\t/**\n\t\t * Instance of the {@link module:engine/view/renderer~Renderer renderer}.\n\t\t *\n\t\t * @protected\n\t\t * @type {module:engine/view/renderer~Renderer}\n\t\t */\n\t\tthis._renderer = new Renderer( this.domConverter, this.document.selection );\n\t\tthis._renderer.bind( 'isFocused' ).to( this.document );\n\n\t\t/**\n\t\t * A DOM root attributes cache. It saves the initial values of DOM root attributes before the DOM element\n\t\t * is {@link module:engine/view/view~View#attachDomRoot attached} to the view so later on, when\n\t\t * the view is destroyed ({@link module:engine/view/view~View#detachDomRoot}), they can be easily restored.\n\t\t * This way, the DOM element can go back to the (clean) state as if the editing view never used it.\n\t\t *\n\t\t * @private\n\t\t * @member {WeakMap.<HTMLElement,Object>}\n\t\t */\n\t\tthis._initialDomRootAttributes = new WeakMap();\n\n\t\t/**\n\t\t * Map of registered {@link module:engine/view/observer/observer~Observer observers}.\n\t\t *\n\t\t * @private\n\t\t * @type {Map.<Function, module:engine/view/observer/observer~Observer>}\n\t\t */\n\t\tthis._observers = new Map();\n\n\t\t/**\n\t\t * Is set to `true` when {@link #change view changes} are currently in progress.\n\t\t *\n\t\t * @private\n\t\t * @type {Boolean}\n\t\t */\n\t\tthis._ongoingChange = false;\n\n\t\t/**\n\t\t * Used to prevent calling {@link #forceRender} and {@link #change} during rendering view to the DOM.\n\t\t *\n\t\t * @private\n\t\t * @type {Boolean}\n\t\t */\n\t\tthis._postFixersInProgress = false;\n\n\t\t/**\n\t\t * Internal flag to temporary disable rendering. See the usage in the {@link #_disableRendering}.\n\t\t *\n\t\t * @private\n\t\t * @type {Boolean}\n\t\t */\n\t\tthis._renderingDisabled = false;\n\n\t\t/**\n\t\t * Internal flag that disables rendering when there are no changes since the last rendering.\n\t\t * It stores information about changed selection and changed elements from attached document roots.\n\t\t *\n\t\t * @private\n\t\t * @type {Boolean}\n\t\t */\n\t\tthis._hasChangedSinceTheLastRendering = false;\n\n\t\t/**\n\t\t * DowncastWriter instance used in {@link #change change method} callbacks.\n\t\t *\n\t\t * @private\n\t\t * @type {module:engine/view/downcastwriter~DowncastWriter}\n\t\t */\n\t\tthis._writer = new DowncastWriter( this.document );\n\n\t\t// Add default observers.\n\t\tthis.addObserver( MutationObserver );\n\t\tthis.addObserver( SelectionObserver );\n\t\tthis.addObserver( FocusObserver );\n\t\tthis.addObserver( KeyObserver );\n\t\tthis.addObserver( FakeSelectionObserver );\n\t\tthis.addObserver( CompositionObserver );\n\n\t\tif ( env.isAndroid ) {\n\t\t\tthis.addObserver( InputObserver );\n\t\t}\n\n\t\t// Inject quirks handlers.\n\t\tinjectQuirksHandling( this );\n\t\tinjectUiElementHandling( this );\n\n\t\t// Use 'normal' priority so that rendering is performed as first when using that priority.\n\t\tthis.on( 'render', () => {\n\t\t\tthis._render();\n\n\t\t\t// Informs that layout has changed after render.\n\t\t\tthis.document.fire( 'layoutChanged' );\n\n\t\t\t// Reset the `_hasChangedSinceTheLastRendering` flag after rendering.\n\t\t\tthis._hasChangedSinceTheLastRendering = false;\n\t\t} );\n\n\t\t// Listen to the document selection changes directly.\n\t\tthis.listenTo( this.document.selection, 'change', () => {\n\t\t\tthis._hasChangedSinceTheLastRendering = true;\n\t\t} );\n\t}\n\n\t/**\n\t * Attaches a DOM root element to the view element and enable all observers on that element.\n\t * Also {@link module:engine/view/renderer~Renderer#markToSync mark element} to be synchronized\n\t * with the view what means that all child nodes will be removed and replaced with content of the view root.\n\t *\n\t * This method also will change view element name as the same as tag name of given dom root.\n\t * Name is always transformed to lower case.\n\t *\n\t * **Note:** Use {@link #detachDomRoot `detachDomRoot()`} to revert this action.\n\t *\n\t * @param {Element} domRoot DOM root element.\n\t * @param {String} [name='main'] Name of the root.\n\t */\n\tattachDomRoot( domRoot, name = 'main' ) {\n\t\tconst viewRoot = this.document.getRoot( name );\n\n\t\t// Set view root name the same as DOM root tag name.\n\t\tviewRoot._name = domRoot.tagName.toLowerCase();\n\n\t\tconst initialDomRootAttributes = {};\n\n\t\t// 1. Copy and cache the attributes to remember the state of the element before attaching.\n\t\t//    The cached attributes will be restored in detachDomRoot() so the element goes to the\n\t\t//    clean state as if the editing view never used it.\n\t\t// 2. Apply the attributes using the view writer, so they all go under the control of the engine.\n\t\t//    The editing view takes over the attribute management completely because various\n\t\t//    features (e.g. addPlaceholder()) require dynamic changes of those attributes and they\n\t\t//    cannot be managed by the engine and the UI library at the same time.\n\t\tfor ( const { name, value } of Array.from( domRoot.attributes ) ) {\n\t\t\tinitialDomRootAttributes[ name ] = value;\n\n\t\t\t// Do not use writer.setAttribute() for the class attribute. The EditableUIView class\n\t\t\t// and its descendants could have already set some using the writer.addClass() on the view\n\t\t\t// document root. They haven't been rendered yet so they are not present in the DOM root.\n\t\t\t// Using writer.setAttribute( 'class', ... ) would override them completely.\n\t\t\tif ( name === 'class' ) {\n\t\t\t\tthis._writer.addClass( value.split( ' ' ), viewRoot );\n\t\t\t} else {\n\t\t\t\tthis._writer.setAttribute( name, value, viewRoot );\n\t\t\t}\n\t\t}\n\n\t\tthis._initialDomRootAttributes.set( domRoot, initialDomRootAttributes );\n\n\t\tconst updateContenteditableAttribute = () => {\n\t\t\tthis._writer.setAttribute( 'contenteditable', !viewRoot.isReadOnly, viewRoot );\n\n\t\t\tif ( viewRoot.isReadOnly ) {\n\t\t\t\tthis._writer.addClass( 'ck-read-only', viewRoot );\n\t\t\t} else {\n\t\t\t\tthis._writer.removeClass( 'ck-read-only', viewRoot );\n\t\t\t}\n\t\t};\n\n\t\t// Set initial value.\n\t\tupdateContenteditableAttribute();\n\n\t\tthis.domRoots.set( name, domRoot );\n\t\tthis.domConverter.bindElements( domRoot, viewRoot );\n\t\tthis._renderer.markToSync( 'children', viewRoot );\n\t\tthis._renderer.markToSync( 'attributes', viewRoot );\n\t\tthis._renderer.domDocuments.add( domRoot.ownerDocument );\n\n\t\tviewRoot.on( 'change:children', ( evt, node ) => this._renderer.markToSync( 'children', node ) );\n\t\tviewRoot.on( 'change:attributes', ( evt, node ) => this._renderer.markToSync( 'attributes', node ) );\n\t\tviewRoot.on( 'change:text', ( evt, node ) => this._renderer.markToSync( 'text', node ) );\n\t\tviewRoot.on( 'change:isReadOnly', () => this.change( updateContenteditableAttribute ) );\n\n\t\tviewRoot.on( 'change', () => {\n\t\t\tthis._hasChangedSinceTheLastRendering = true;\n\t\t} );\n\n\t\tfor ( const observer of this._observers.values() ) {\n\t\t\tobserver.observe( domRoot, name );\n\t\t}\n\t}\n\n\t/**\n\t * Detaches a DOM root element from the view element and restores its attributes to the state before\n\t * {@link #attachDomRoot `attachDomRoot()`}.\n\t *\n\t * @param {String} name Name of the root to detach.\n\t */\n\tdetachDomRoot( name ) {\n\t\tconst domRoot = this.domRoots.get( name );\n\n\t\t// Remove all root attributes so the DOM element is \"bare\".\n\t\tArray.from( domRoot.attributes ).forEach( ( { name } ) => domRoot.removeAttribute( name ) );\n\n\t\tconst initialDomRootAttributes = this._initialDomRootAttributes.get( domRoot );\n\n\t\t// Revert all view root attributes back to the state before attachDomRoot was called.\n\t\tfor ( const attribute in initialDomRootAttributes ) {\n\t\t\tdomRoot.setAttribute( attribute, initialDomRootAttributes[ attribute ] );\n\t\t}\n\n\t\tthis.domRoots.delete( name );\n\t\tthis.domConverter.unbindDomElement( domRoot );\n\t}\n\n\t/**\n\t * Gets DOM root element.\n\t *\n\t * @param {String} [name='main']  Name of the root.\n\t * @returns {Element} DOM root element instance.\n\t */\n\tgetDomRoot( name = 'main' ) {\n\t\treturn this.domRoots.get( name );\n\t}\n\n\t/**\n\t * Creates observer of the given type if not yet created, {@link module:engine/view/observer/observer~Observer#enable enables} it\n\t * and {@link module:engine/view/observer/observer~Observer#observe attaches} to all existing and future\n\t * {@link #domRoots DOM roots}.\n\t *\n\t * Note: Observers are recognized by their constructor (classes). A single observer will be instantiated and used only\n\t * when registered for the first time. This means that features and other components can register a single observer\n\t * multiple times without caring whether it has been already added or not.\n\t *\n\t * @param {Function} Observer The constructor of an observer to add.\n\t * Should create an instance inheriting from {@link module:engine/view/observer/observer~Observer}.\n\t * @returns {module:engine/view/observer/observer~Observer} Added observer instance.\n\t */\n\taddObserver( Observer ) {\n\t\tlet observer = this._observers.get( Observer );\n\n\t\tif ( observer ) {\n\t\t\treturn observer;\n\t\t}\n\n\t\tobserver = new Observer( this );\n\n\t\tthis._observers.set( Observer, observer );\n\n\t\tfor ( const [ name, domElement ] of this.domRoots ) {\n\t\t\tobserver.observe( domElement, name );\n\t\t}\n\n\t\tobserver.enable();\n\n\t\treturn observer;\n\t}\n\n\t/**\n\t * Returns observer of the given type or `undefined` if such observer has not been added yet.\n\t *\n\t * @param {Function} Observer The constructor of an observer to get.\n\t * @returns {module:engine/view/observer/observer~Observer|undefined} Observer instance or undefined.\n\t */\n\tgetObserver( Observer ) {\n\t\treturn this._observers.get( Observer );\n\t}\n\n\t/**\n\t * Disables all added observers.\n\t */\n\tdisableObservers() {\n\t\tfor ( const observer of this._observers.values() ) {\n\t\t\tobserver.disable();\n\t\t}\n\t}\n\n\t/**\n\t * Enables all added observers.\n\t */\n\tenableObservers() {\n\t\tfor ( const observer of this._observers.values() ) {\n\t\t\tobserver.enable();\n\t\t}\n\t}\n\n\t/**\n\t * Scrolls the page viewport and {@link #domRoots} with their ancestors to reveal the\n\t * caret, if not already visible to the user.\n\t */\n\tscrollToTheSelection() {\n\t\tconst range = this.document.selection.getFirstRange();\n\n\t\tif ( range ) {\n\t\t\tscrollViewportToShowTarget( {\n\t\t\t\ttarget: this.domConverter.viewRangeToDom( range ),\n\t\t\t\tviewportOffset: 20\n\t\t\t} );\n\t\t}\n\t}\n\n\t/**\n\t * It will focus DOM element representing {@link module:engine/view/editableelement~EditableElement EditableElement}\n\t * that is currently having selection inside.\n\t */\n\tfocus() {\n\t\tif ( !this.document.isFocused ) {\n\t\t\tconst editable = this.document.selection.editableElement;\n\n\t\t\tif ( editable ) {\n\t\t\t\tthis.domConverter.focus( editable );\n\t\t\t\tthis.forceRender();\n\t\t\t} else {\n\t\t\t\t// Before focusing view document, selection should be placed inside one of the view's editables.\n\t\t\t\t// Normally its selection will be converted from model document (which have default selection), but\n\t\t\t\t// when using view document on its own, we need to manually place selection before focusing it.\n\t\t\t\t//\n\t\t\t\t// @if CK_DEBUG // console.warn( 'There is no selection in any editable to focus.' );\n\t\t\t}\n\t\t}\n\t}\n\n\t/**\n\t * The `change()` method is the primary way of changing the view. You should use it to modify any node in the view tree.\n\t * It makes sure that after all changes are made the view is rendered to the DOM (assuming that the view will be changed\n\t * inside the callback). It prevents situations when the DOM is updated when the view state is not yet correct. It allows\n\t * to nest calls one inside another and still performs a single rendering after all those changes are made.\n\t * It also returns the return value of its callback.\n\t *\n\t *\t\tconst text = view.change( writer => {\n\t *\t\t\tconst newText = writer.createText( 'foo' );\n\t *\t\t\twriter.insert( position1, newText );\n\t *\n\t *\t\t\tview.change( writer => {\n\t *\t\t\t\twriter.insert( position2, writer.createText( 'bar' ) );\n\t *\t\t\t} );\n\t *\n\t * \t\t\twriter.remove( range );\n\t *\n\t * \t\t\treturn newText;\n\t *\t\t} );\n\t *\n\t * When the outermost change block is done and rendering to the DOM is over the\n\t * {@link module:engine/view/view~View#event:render `View#render`} event is fired.\n\t *\n\t * This method throws a `applying-view-changes-on-rendering` error when\n\t * the change block is used after rendering to the DOM has started.\n\t *\n\t * @param {Function} callback Callback function which may modify the view.\n\t * @returns {*} Value returned by the callback.\n\t */\n\tchange( callback ) {\n\t\tif ( this.isRenderingInProgress || this._postFixersInProgress ) {\n\t\t\t/**\n\t\t\t * Thrown when there is an attempt to make changes to the view tree when it is in incorrect state. This may\n\t\t\t * cause some unexpected behaviour and inconsistency between the DOM and the view.\n\t\t\t * This may be caused by:\n\t\t\t *\n\t\t\t * * calling {@link #change} or {@link #forceRender} during rendering process,\n\t\t\t * * calling {@link #change} or {@link #forceRender} inside of\n\t\t\t *   {@link module:engine/view/document~Document#registerPostFixer post-fixer function}.\n\t\t\t *\n\t\t\t * @error cannot-change-view-tree\n\t\t\t */\n\t\t\tthrow new CKEditorError(\n\t\t\t\t'cannot-change-view-tree',\n\t\t\t\tthis\n\t\t\t);\n\t\t}\n\n\t\ttry {\n\t\t\t// Recursive call to view.change() method - execute listener immediately.\n\t\t\tif ( this._ongoingChange ) {\n\t\t\t\treturn callback( this._writer );\n\t\t\t}\n\n\t\t\t// This lock will assure that all recursive calls to view.change() will end up in same block - one \"render\"\n\t\t\t// event for all nested calls.\n\t\t\tthis._ongoingChange = true;\n\t\t\tconst callbackResult = callback( this._writer );\n\t\t\tthis._ongoingChange = false;\n\n\t\t\t// This lock is used by editing controller to render changes from outer most model.change() once. As plugins might call\n\t\t\t// view.change() inside model.change() block - this will ensures that postfixers and rendering are called once after all\n\t\t\t// changes. Also, we don't need to render anything if there're no changes since last rendering.\n\t\t\tif ( !this._renderingDisabled && this._hasChangedSinceTheLastRendering ) {\n\t\t\t\tthis._postFixersInProgress = true;\n\t\t\t\tthis.document._callPostFixers( this._writer );\n\t\t\t\tthis._postFixersInProgress = false;\n\n\t\t\t\tthis.fire( 'render' );\n\t\t\t}\n\n\t\t\treturn callbackResult;\n\t\t} catch ( err ) {\n\t\t\t// @if CK_DEBUG // throw err;\n\t\t\t/* istanbul ignore next */\n\t\t\tCKEditorError.rethrowUnexpectedError( err, this );\n\t\t}\n\t}\n\n\t/**\n\t * Forces rendering {@link module:engine/view/document~Document view document} to DOM. If any view changes are\n\t * currently in progress, rendering will start after all {@link #change change blocks} are processed.\n\t *\n\t * Note that this method is dedicated for special cases. All view changes should be wrapped in the {@link #change}\n\t * block and the view will automatically check whether it needs to render DOM or not.\n\t *\n\t * Throws {@link module:utils/ckeditorerror~CKEditorError CKEditorError} `applying-view-changes-on-rendering` when\n\t * trying to re-render when rendering to DOM has already started.\n\t */\n\tforceRender() {\n\t\tthis._hasChangedSinceTheLastRendering = true;\n\t\tthis.change( () => {} );\n\t}\n\n\t/**\n\t * Destroys this instance. Makes sure that all observers are destroyed and listeners removed.\n\t */\n\tdestroy() {\n\t\tfor ( const observer of this._observers.values() ) {\n\t\t\tobserver.destroy();\n\t\t}\n\n\t\tthis.document.destroy();\n\n\t\tthis.stopListening();\n\t}\n\n\t/**\n\t * Creates position at the given location. The location can be specified as:\n\t *\n\t * * a {@link module:engine/view/position~Position position},\n\t * * parent element and offset (offset defaults to `0`),\n\t * * parent element and `'end'` (sets position at the end of that element),\n\t * * {@link module:engine/view/item~Item view item} and `'before'` or `'after'` (sets position before or after given view item).\n\t *\n\t * This method is a shortcut to other constructors such as:\n\t *\n\t * * {@link #createPositionBefore},\n\t * * {@link #createPositionAfter},\n\t *\n\t * @param {module:engine/view/item~Item|module:engine/model/position~Position} itemOrPosition\n\t * @param {Number|'end'|'before'|'after'} [offset] Offset or one of the flags. Used only when\n\t * first parameter is a {@link module:engine/view/item~Item view item}.\n\t */\n\tcreatePositionAt( itemOrPosition, offset ) {\n\t\treturn Position._createAt( itemOrPosition, offset );\n\t}\n\n\t/**\n\t * Creates a new position after given view item.\n\t *\n\t * @param {module:engine/view/item~Item} item View item after which the position should be located.\n\t * @returns {module:engine/view/position~Position}\n\t */\n\tcreatePositionAfter( item ) {\n\t\treturn Position._createAfter( item );\n\t}\n\n\t/**\n\t * Creates a new position before given view item.\n\t *\n\t * @param {module:engine/view/item~Item} item View item before which the position should be located.\n\t * @returns {module:engine/view/position~Position}\n\t */\n\tcreatePositionBefore( item ) {\n\t\treturn Position._createBefore( item );\n\t}\n\n\t/**\n\t * Creates a range spanning from `start` position to `end` position.\n\t *\n\t * **Note:** This factory method creates it's own {@link module:engine/view/position~Position} instances basing on passed values.\n\t *\n\t * @param {module:engine/view/position~Position} start Start position.\n\t * @param {module:engine/view/position~Position} [end] End position. If not set, range will be collapsed at `start` position.\n\t * @returns {module:engine/view/range~Range}\n\t */\n\tcreateRange( start, end ) {\n\t\treturn new Range( start, end );\n\t}\n\n\t/**\n\t * Creates a range that starts before given {@link module:engine/view/item~Item view item} and ends after it.\n\t *\n\t * @param {module:engine/view/item~Item} item\n\t * @returns {module:engine/view/range~Range}\n\t */\n\tcreateRangeOn( item ) {\n\t\treturn Range._createOn( item );\n\t}\n\n\t/**\n\t * Creates a range inside an {@link module:engine/view/element~Element element} which starts before the first child of\n\t * that element and ends after the last child of that element.\n\t *\n\t * @param {module:engine/view/element~Element} element Element which is a parent for the range.\n\t * @returns {module:engine/view/range~Range}\n\t */\n\tcreateRangeIn( element ) {\n\t\treturn Range._createIn( element );\n\t}\n\n\t/**\n\t Creates new {@link module:engine/view/selection~Selection} instance.\n\t *\n\t * \t\t// Creates empty selection without ranges.\n\t *\t\tconst selection = view.createSelection();\n\t *\n\t *\t\t// Creates selection at the given range.\n\t *\t\tconst range = view.createRange( start, end );\n\t *\t\tconst selection = view.createSelection( range );\n\t *\n\t *\t\t// Creates selection at the given ranges\n\t * \t\tconst ranges = [ view.createRange( start1, end2 ), view.createRange( star2, end2 ) ];\n\t *\t\tconst selection = view.createSelection( ranges );\n\t *\n\t *\t\t// Creates selection from the other selection.\n\t *\t\tconst otherSelection = view.createSelection();\n\t *\t\tconst selection = view.createSelection( otherSelection );\n\t *\n\t *\t\t// Creates selection from the document selection.\n\t *\t\tconst selection = view.createSelection( editor.editing.view.document.selection );\n\t *\n\t * \t\t// Creates selection at the given position.\n\t *\t\tconst position = view.createPositionFromPath( root, path );\n\t *\t\tconst selection = view.createSelection( position );\n\t *\n\t *\t\t// Creates collapsed selection at the position of given item and offset.\n\t *\t\tconst paragraph = view.createContainerElement( 'paragraph' );\n\t *\t\tconst selection = view.createSelection( paragraph, offset );\n\t *\n\t *\t\t// Creates a range inside an {@link module:engine/view/element~Element element} which starts before the\n\t *\t\t// first child of that element and ends after the last child of that element.\n\t *\t\tconst selection = view.createSelection( paragraph, 'in' );\n\t *\n\t *\t\t// Creates a range on an {@link module:engine/view/item~Item item} which starts before the item and ends\n\t *\t\t// just after the item.\n\t *\t\tconst selection = view.createSelection( paragraph, 'on' );\n\t *\n\t * `Selection`'s factory method allow passing additional options (`backward`, `fake` and `label`) as the last argument.\n\t *\n\t *\t\t// Creates backward selection.\n\t *\t\tconst selection = view.createSelection( range, { backward: true } );\n\t *\n\t * Fake selection does not render as browser native selection over selected elements and is hidden to the user.\n\t * This way, no native selection UI artifacts are displayed to the user and selection over elements can be\n\t * represented in other way, for example by applying proper CSS class.\n\t *\n\t * Additionally fake's selection label can be provided. It will be used to describe fake selection in DOM\n\t * (and be  properly handled by screen readers).\n\t *\n\t *\t\t// Creates fake selection with label.\n\t *\t\tconst selection = view.createSelection( range, { fake: true, label: 'foo' } );\n\t *\n\t * @param {module:engine/view/selection~Selectable} [selectable=null]\n\t * @param {Number|'before'|'end'|'after'|'on'|'in'} [placeOrOffset] Offset or place when selectable is an `Item`.\n\t * @param {Object} [options]\n\t * @param {Boolean} [options.backward] Sets this selection instance to be backward.\n\t * @param {Boolean} [options.fake] Sets this selection instance to be marked as `fake`.\n\t * @param {String} [options.label] Label for the fake selection.\n\t * @returns {module:engine/view/selection~Selection}\n\t */\n\tcreateSelection( selectable, placeOrOffset, options ) {\n\t\treturn new Selection( selectable, placeOrOffset, options );\n\t}\n\n\t/**\n\t * Disables or enables rendering. If the flag is set to `true` then the rendering will be disabled.\n\t * If the flag is set to `false` and if there was some change in the meantime, then the rendering action will be performed.\n\t *\n\t * @protected\n\t * @param {Boolean} flag A flag indicates whether the rendering should be disabled.\n\t */\n\t_disableRendering( flag ) {\n\t\tthis._renderingDisabled = flag;\n\n\t\tif ( flag == false ) {\n\t\t\t// Render when you stop blocking rendering.\n\t\t\tthis.change( () => {} );\n\t\t}\n\t}\n\n\t/**\n\t * Renders all changes. In order to avoid triggering the observers (e.g. mutations) all observers are disabled\n\t * before rendering and re-enabled after that.\n\t *\n\t * @private\n\t */\n\t_render() {\n\t\tthis.isRenderingInProgress = true;\n\t\tthis.disableObservers();\n\t\tthis._renderer.render();\n\t\tthis.enableObservers();\n\t\tthis.isRenderingInProgress = false;\n\t}\n\n\t/**\n\t * Fired after a topmost {@link module:engine/view/view~View#change change block} and all\n\t * {@link module:engine/view/document~Document#registerPostFixer post-fixers} are executed.\n\t *\n\t * Actual rendering is performed as a first listener on 'normal' priority.\n\t *\n\t *\t\tview.on( 'render', () => {\n\t *\t\t\t// Rendering to the DOM is complete.\n\t *\t\t} );\n\t *\n\t * This event is useful when you want to update interface elements after the rendering, e.g. position of the\n\t * balloon panel. If you wants to change view structure use\n\t * {@link module:engine/view/document~Document#registerPostFixer post-fixers}.\n\t *\n\t * @event module:engine/view/view~View#event:render\n\t */\n}\n\nmix( View, ObservableMixin );\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module engine/model/node\n */\n\nimport toMap from '@ckeditor/ckeditor5-utils/src/tomap';\nimport CKEditorError from '@ckeditor/ckeditor5-utils/src/ckeditorerror';\nimport compareArrays from '@ckeditor/ckeditor5-utils/src/comparearrays';\n// To check if component is loaded more than once.\nimport '@ckeditor/ckeditor5-utils/src/version';\n\n/**\n * Model node. Most basic structure of model tree.\n *\n * This is an abstract class that is a base for other classes representing different nodes in model.\n *\n * **Note:** If a node is detached from the model tree, you can manipulate it using it's API.\n * However, it is **very important** that nodes already attached to model tree should be only changed through\n * {@link module:engine/model/writer~Writer Writer API}.\n *\n * Changes done by `Node` methods, like {@link module:engine/model/element~Element#_insertChild _insertChild} or\n * {@link module:engine/model/node~Node#_setAttribute _setAttribute}\n * do not generate {@link module:engine/model/operation/operation~Operation operations}\n * which are essential for correct editor work if you modify nodes in {@link module:engine/model/document~Document document} root.\n *\n * The flow of working on `Node` (and classes that inherits from it) is as such:\n * 1. You can create a `Node` instance, modify it using it's API.\n * 2. Add `Node` to the model using `Batch` API.\n * 3. Change `Node` that was already added to the model using `Batch` API.\n *\n * Similarly, you cannot use `Batch` API on a node that has not been added to the model tree, with the exception\n * of {@link module:engine/model/writer~Writer#insert inserting} that node to the model tree.\n *\n * Be aware that using {@link module:engine/model/writer~Writer#remove remove from Batch API} does not allow to use `Node` API because\n * the information about `Node` is still kept in model document.\n *\n * In case of {@link module:engine/model/element~Element element node}, adding and removing children also counts as changing a node and\n * follows same rules.\n */\nexport default class Node {\n\t/**\n\t * Creates a model node.\n\t *\n\t * This is an abstract class, so this constructor should not be used directly.\n\t *\n\t * @abstract\n\t * @param {Object} [attrs] Node's attributes. See {@link module:utils/tomap~toMap} for a list of accepted values.\n\t */\n\tconstructor( attrs ) {\n\t\t/**\n\t\t * Parent of this node. It could be {@link module:engine/model/element~Element}\n\t\t * or {@link module:engine/model/documentfragment~DocumentFragment}.\n\t\t * Equals to `null` if the node has no parent.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:engine/model/element~Element|module:engine/model/documentfragment~DocumentFragment|null}\n\t\t */\n\t\tthis.parent = null;\n\n\t\t/**\n\t\t * Attributes set on this node.\n\t\t *\n\t\t * @private\n\t\t * @member {Map} module:engine/model/node~Node#_attrs\n\t\t */\n\t\tthis._attrs = toMap( attrs );\n\t}\n\n\t/**\n\t * Index of this node in it's parent or `null` if the node has no parent.\n\t *\n\t * Accessing this property throws an error if this node's parent element does not contain it.\n\t * This means that model tree got broken.\n\t *\n\t * @readonly\n\t * @type {Number|null}\n\t */\n\tget index() {\n\t\tlet pos;\n\n\t\tif ( !this.parent ) {\n\t\t\treturn null;\n\t\t}\n\n\t\tif ( ( pos = this.parent.getChildIndex( this ) ) === null ) {\n\t\t\tthrow new CKEditorError( 'model-node-not-found-in-parent', this );\n\t\t}\n\n\t\treturn pos;\n\t}\n\n\t/**\n\t * Offset at which this node starts in it's parent. It is equal to the sum of {@link #offsetSize offsetSize}\n\t * of all it's previous siblings. Equals to `null` if node has no parent.\n\t *\n\t * Accessing this property throws an error if this node's parent element does not contain it.\n\t * This means that model tree got broken.\n\t *\n\t * @readonly\n\t * @type {Number|null}\n\t */\n\tget startOffset() {\n\t\tlet pos;\n\n\t\tif ( !this.parent ) {\n\t\t\treturn null;\n\t\t}\n\n\t\tif ( ( pos = this.parent.getChildStartOffset( this ) ) === null ) {\n\t\t\tthrow new CKEditorError( 'model-node-not-found-in-parent', this );\n\t\t}\n\n\t\treturn pos;\n\t}\n\n\t/**\n\t * Offset size of this node. Represents how much \"offset space\" is occupied by the node in it's parent.\n\t * It is important for {@link module:engine/model/position~Position position}. When node has `offsetSize` greater than `1`, position\n\t * can be placed between that node start and end. `offsetSize` greater than `1` is for nodes that represents more\n\t * than one entity, i.e. {@link module:engine/model/text~Text text node}.\n\t *\n\t * @readonly\n\t * @type {Number}\n\t */\n\tget offsetSize() {\n\t\treturn 1;\n\t}\n\n\t/**\n\t * Offset at which this node ends in it's parent. It is equal to the sum of this node's\n\t * {@link module:engine/model/node~Node#startOffset start offset} and {@link #offsetSize offset size}.\n\t * Equals to `null` if the node has no parent.\n\t *\n\t * @readonly\n\t * @type {Number|null}\n\t */\n\tget endOffset() {\n\t\tif ( !this.parent ) {\n\t\t\treturn null;\n\t\t}\n\n\t\treturn this.startOffset + this.offsetSize;\n\t}\n\n\t/**\n\t * Node's next sibling or `null` if the node is a last child of it's parent or if the node has no parent.\n\t *\n\t * @readonly\n\t * @type {module:engine/model/node~Node|null}\n\t */\n\tget nextSibling() {\n\t\tconst index = this.index;\n\n\t\treturn ( index !== null && this.parent.getChild( index + 1 ) ) || null;\n\t}\n\n\t/**\n\t * Node's previous sibling or `null` if the node is a first child of it's parent or if the node has no parent.\n\t *\n\t * @readonly\n\t * @type {module:engine/model/node~Node|null}\n\t */\n\tget previousSibling() {\n\t\tconst index = this.index;\n\n\t\treturn ( index !== null && this.parent.getChild( index - 1 ) ) || null;\n\t}\n\n\t/**\n\t * The top-most ancestor of the node. If node has no parent it is the root itself. If the node is a part\n\t * of {@link module:engine/model/documentfragment~DocumentFragment}, it's `root` is equal to that `DocumentFragment`.\n\t *\n\t * @readonly\n\t * @type {module:engine/model/node~Node|module:engine/model/documentfragment~DocumentFragment}\n\t */\n\tget root() {\n\t\tlet root = this; // eslint-disable-line consistent-this\n\n\t\twhile ( root.parent ) {\n\t\t\troot = root.parent;\n\t\t}\n\n\t\treturn root;\n\t}\n\n\t/**\n\t * Returns true if the node is in a tree rooted in the document (is a descendant of one of its roots).\n\t *\n\t * @returns {Boolean}\n\t */\n\tisAttached() {\n\t\treturn this.root.is( 'rootElement' );\n\t}\n\n\t/**\n\t * Gets path to the node. The path is an array containing starting offsets of consecutive ancestors of this node,\n\t * beginning from {@link module:engine/model/node~Node#root root}, down to this node's starting offset. The path can be used to\n\t * create {@link module:engine/model/position~Position Position} instance.\n\t *\n\t *\t\tconst abc = new Text( 'abc' );\n\t *\t\tconst foo = new Text( 'foo' );\n\t *\t\tconst h1 = new Element( 'h1', null, new Text( 'header' ) );\n\t *\t\tconst p = new Element( 'p', null, [ abc, foo ] );\n\t *\t\tconst div = new Element( 'div', null, [ h1, p ] );\n\t *\t\tfoo.getPath(); // Returns [ 1, 3 ]. `foo` is in `p` which is in `div`. `p` starts at offset 1, while `foo` at 3.\n\t *\t\th1.getPath(); // Returns [ 0 ].\n\t *\t\tdiv.getPath(); // Returns [].\n\t *\n\t * @returns {Array.<Number>} The path.\n\t */\n\tgetPath() {\n\t\tconst path = [];\n\t\tlet node = this; // eslint-disable-line consistent-this\n\n\t\twhile ( node.parent ) {\n\t\t\tpath.unshift( node.startOffset );\n\t\t\tnode = node.parent;\n\t\t}\n\n\t\treturn path;\n\t}\n\n\t/**\n\t * Returns ancestors array of this node.\n\t *\n\t * @param {Object} options Options object.\n\t * @param {Boolean} [options.includeSelf=false] When set to `true` this node will be also included in parent's array.\n\t * @param {Boolean} [options.parentFirst=false] When set to `true`, array will be sorted from node's parent to root element,\n\t * otherwise root element will be the first item in the array.\n\t * @returns {Array} Array with ancestors.\n\t */\n\tgetAncestors( options = { includeSelf: false, parentFirst: false } ) {\n\t\tconst ancestors = [];\n\t\tlet parent = options.includeSelf ? this : this.parent;\n\n\t\twhile ( parent ) {\n\t\t\tancestors[ options.parentFirst ? 'push' : 'unshift' ]( parent );\n\t\t\tparent = parent.parent;\n\t\t}\n\n\t\treturn ancestors;\n\t}\n\n\t/**\n\t * Returns a {@link module:engine/model/element~Element} or {@link module:engine/model/documentfragment~DocumentFragment}\n\t * which is a common ancestor of both nodes.\n\t *\n\t * @param {module:engine/model/node~Node} node The second node.\n\t * @param {Object} options Options object.\n\t * @param {Boolean} [options.includeSelf=false] When set to `true` both nodes will be considered \"ancestors\" too.\n\t * Which means that if e.g. node A is inside B, then their common ancestor will be B.\n\t * @returns {module:engine/model/element~Element|module:engine/model/documentfragment~DocumentFragment|null}\n\t */\n\tgetCommonAncestor( node, options = {} ) {\n\t\tconst ancestorsA = this.getAncestors( options );\n\t\tconst ancestorsB = node.getAncestors( options );\n\n\t\tlet i = 0;\n\n\t\twhile ( ancestorsA[ i ] == ancestorsB[ i ] && ancestorsA[ i ] ) {\n\t\t\ti++;\n\t\t}\n\n\t\treturn i === 0 ? null : ancestorsA[ i - 1 ];\n\t}\n\n\t/**\n\t * Returns whether this node is before given node. `false` is returned if nodes are in different trees (for example,\n\t * in different {@link module:engine/model/documentfragment~DocumentFragment}s).\n\t *\n\t * @param {module:engine/model/node~Node} node Node to compare with.\n\t * @returns {Boolean}\n\t */\n\tisBefore( node ) {\n\t\t// Given node is not before this node if they are same.\n\t\tif ( this == node ) {\n\t\t\treturn false;\n\t\t}\n\n\t\t// Return `false` if it is impossible to compare nodes.\n\t\tif ( this.root !== node.root ) {\n\t\t\treturn false;\n\t\t}\n\n\t\tconst thisPath = this.getPath();\n\t\tconst nodePath = node.getPath();\n\n\t\tconst result = compareArrays( thisPath, nodePath );\n\n\t\tswitch ( result ) {\n\t\t\tcase 'prefix':\n\t\t\t\treturn true;\n\n\t\t\tcase 'extension':\n\t\t\t\treturn false;\n\n\t\t\tdefault:\n\t\t\t\treturn thisPath[ result ] < nodePath[ result ];\n\t\t}\n\t}\n\n\t/**\n\t * Returns whether this node is after given node. `false` is returned if nodes are in different trees (for example,\n\t * in different {@link module:engine/model/documentfragment~DocumentFragment}s).\n\t *\n\t * @param {module:engine/model/node~Node} node Node to compare with.\n\t * @returns {Boolean}\n\t */\n\tisAfter( node ) {\n\t\t// Given node is not before this node if they are same.\n\t\tif ( this == node ) {\n\t\t\treturn false;\n\t\t}\n\n\t\t// Return `false` if it is impossible to compare nodes.\n\t\tif ( this.root !== node.root ) {\n\t\t\treturn false;\n\t\t}\n\n\t\t// In other cases, just check if the `node` is before, and return the opposite.\n\t\treturn !this.isBefore( node );\n\t}\n\n\t/**\n\t * Checks if the node has an attribute with given key.\n\t *\n\t * @param {String} key Key of attribute to check.\n\t * @returns {Boolean} `true` if attribute with given key is set on node, `false` otherwise.\n\t */\n\thasAttribute( key ) {\n\t\treturn this._attrs.has( key );\n\t}\n\n\t/**\n\t * Gets an attribute value for given key or `undefined` if that attribute is not set on node.\n\t *\n\t * @param {String} key Key of attribute to look for.\n\t * @returns {*} Attribute value or `undefined`.\n\t */\n\tgetAttribute( key ) {\n\t\treturn this._attrs.get( key );\n\t}\n\n\t/**\n\t * Returns iterator that iterates over this node's attributes.\n\t *\n\t * Attributes are returned as arrays containing two items. First one is attribute key and second is attribute value.\n\t * This format is accepted by native `Map` object and also can be passed in `Node` constructor.\n\t *\n\t * @returns {Iterable.<*>}\n\t */\n\tgetAttributes() {\n\t\treturn this._attrs.entries();\n\t}\n\n\t/**\n\t * Returns iterator that iterates over this node's attribute keys.\n\t *\n\t * @returns {Iterable.<String>}\n\t */\n\tgetAttributeKeys() {\n\t\treturn this._attrs.keys();\n\t}\n\n\t/**\n\t * Converts `Node` to plain object and returns it.\n\t *\n\t * @returns {Object} `Node` converted to plain object.\n\t */\n\ttoJSON() {\n\t\tconst json = {};\n\n\t\t// Serializes attributes to the object.\n\t\t// attributes = { a: 'foo', b: 1, c: true }.\n\t\tif ( this._attrs.size ) {\n\t\t\tjson.attributes = Array.from( this._attrs ).reduce( ( result, attr ) => {\n\t\t\t\tresult[ attr[ 0 ] ] = attr[ 1 ];\n\n\t\t\t\treturn result;\n\t\t\t}, {} );\n\t\t}\n\n\t\treturn json;\n\t}\n\n\t/**\n\t * Checks whether this object is of the given type.\n\t *\n\t * This method is useful when processing model objects that are of unknown type. For example, a function\n\t * may return a {@link module:engine/model/documentfragment~DocumentFragment} or a {@link module:engine/model/node~Node}\n\t * that can be either a text node or an element. This method can be used to check what kind of object is returned.\n\t *\n\t *\t\tsomeObject.is( 'element' ); // -> true if this is an element\n\t *\t\tsomeObject.is( 'node' ); // -> true if this is a node (a text node or an element)\n\t *\t\tsomeObject.is( 'documentFragment' ); // -> true if this is a document fragment\n\t *\n\t * Since this method is also available on a range of view objects, you can prefix the type of the object with\n\t * `model:` or `view:` to check, for example, if this is the model's or view's element:\n\t *\n\t *\t\tmodelElement.is( 'model:element' ); // -> true\n\t *\t\tmodelElement.is( 'view:element' ); // -> false\n\t *\n\t * By using this method it is also possible to check a name of an element:\n\t *\n\t *\t\timageElement.is( 'element', 'image' ); // -> true\n\t *\t\timageElement.is( 'element', 'image' ); // -> same as above\n\t *\t\timageElement.is( 'model:element', 'image' ); // -> same as above, but more precise\n\t *\n\t * The list of model objects which implement the `is()` method:\n\t *\n\t * * {@link module:engine/model/node~Node#is `Node#is()`}\n\t * * {@link module:engine/model/text~Text#is `Text#is()`}\n\t * * {@link module:engine/model/element~Element#is `Element#is()`}\n\t * * {@link module:engine/model/rootelement~RootElement#is `RootElement#is()`}\n\t * * {@link module:engine/model/position~Position#is `Position#is()`}\n\t * * {@link module:engine/model/liveposition~LivePosition#is `LivePosition#is()`}\n\t * * {@link module:engine/model/range~Range#is `Range#is()`}\n\t * * {@link module:engine/model/liverange~LiveRange#is `LiveRange#is()`}\n\t * * {@link module:engine/model/documentfragment~DocumentFragment#is `DocumentFragment#is()`}\n\t * * {@link module:engine/model/selection~Selection#is `Selection#is()`}\n\t * * {@link module:engine/model/documentselection~DocumentSelection#is `DocumentSelection#is()`}\n\t * * {@link module:engine/model/markercollection~Marker#is `Marker#is()`}\n\t * * {@link module:engine/model/textproxy~TextProxy#is `TextProxy#is()`}\n\t *\n\t * @method #is\n\t * @param {String} type Type to check.\n\t * @returns {Boolean}\n\t */\n\tis( type ) {\n\t\treturn type === 'node' || type === 'model:node';\n\t}\n\n\t/**\n\t * Creates a copy of this node, that is a node with exactly same attributes, and returns it.\n\t *\n\t * @protected\n\t * @returns {module:engine/model/node~Node} Node with same attributes as this node.\n\t */\n\t_clone() {\n\t\treturn new Node( this._attrs );\n\t}\n\n\t/**\n\t * Removes this node from it's parent.\n\t *\n\t * @see module:engine/model/writer~Writer#remove\n\t * @protected\n\t */\n\t_remove() {\n\t\tthis.parent._removeChildren( this.index );\n\t}\n\n\t/**\n\t * Sets attribute on the node. If attribute with the same key already is set, it's value is overwritten.\n\t *\n\t * @see module:engine/model/writer~Writer#setAttribute\n\t * @protected\n\t * @param {String} key Key of attribute to set.\n\t * @param {*} value Attribute value.\n\t */\n\t_setAttribute( key, value ) {\n\t\tthis._attrs.set( key, value );\n\t}\n\n\t/**\n\t * Removes all attributes from the node and sets given attributes.\n\t *\n\t * @see module:engine/model/writer~Writer#setAttributes\n\t * @protected\n\t * @param {Object} [attrs] Attributes to set. See {@link module:utils/tomap~toMap} for a list of accepted values.\n\t */\n\t_setAttributesTo( attrs ) {\n\t\tthis._attrs = toMap( attrs );\n\t}\n\n\t/**\n\t * Removes an attribute with given key from the node.\n\t *\n\t * @see module:engine/model/writer~Writer#removeAttribute\n\t * @protected\n\t * @param {String} key Key of attribute to remove.\n\t * @returns {Boolean} `true` if the attribute was set on the element, `false` otherwise.\n\t */\n\t_removeAttribute( key ) {\n\t\treturn this._attrs.delete( key );\n\t}\n\n\t/**\n\t * Removes all attributes from the node.\n\t *\n\t * @see module:engine/model/writer~Writer#clearAttributes\n\t * @protected\n\t */\n\t_clearAttributes() {\n\t\tthis._attrs.clear();\n\t}\n}\n\n/**\n * The node's parent does not contain this node.\n *\n * @error model-node-not-found-in-parent\n */\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module engine/model/text\n */\n\nimport Node from './node';\n\n// @if CK_DEBUG_ENGINE // const { convertMapToStringifiedObject } = require( '../dev-utils/utils' );\n\n/**\n * Model text node. Type of {@link module:engine/model/node~Node node} that contains {@link module:engine/model/text~Text#data text data}.\n *\n * **Important:** see {@link module:engine/model/node~Node} to read about restrictions using `Text` and `Node` API.\n *\n * **Note:** keep in mind that `Text` instances might indirectly got removed from model tree when model is changed.\n * This happens when {@link module:engine/model/writer~Writer model writer} is used to change model and the text node is merged with\n * another text node. Then, both text nodes are removed and a new text node is inserted into the model. Because of\n * this behavior, keeping references to `Text` is not recommended. Instead, consider creating\n * {@link module:engine/model/liveposition~LivePosition live position} placed before the text node.\n *\n * @extends module:engine/model/node~Node\n */\nexport default class Text extends Node {\n\t/**\n\t * Creates a text node.\n\t *\n\t * **Note:** Constructor of this class shouldn't be used directly in the code.\n\t * Use the {@link module:engine/model/writer~Writer#createText} method instead.\n\t *\n\t * @protected\n\t * @param {String} data Node's text.\n\t * @param {Object} [attrs] Node's attributes. See {@link module:utils/tomap~toMap} for a list of accepted values.\n\t */\n\tconstructor( data, attrs ) {\n\t\tsuper( attrs );\n\n\t\t/**\n\t\t * Text data contained in this text node.\n\t\t *\n\t\t * @protected\n\t\t * @type {String}\n\t\t */\n\t\tthis._data = data || '';\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tget offsetSize() {\n\t\treturn this.data.length;\n\t}\n\n\t/**\n\t * Returns a text data contained in the node.\n\t *\n\t * @readonly\n\t * @type {String}\n\t */\n\tget data() {\n\t\treturn this._data;\n\t}\n\n\t/**\n\t * Checks whether this object is of the given.\n\t *\n\t *\t\ttext.is( '$text' ); // -> true\n\t *\t\ttext.is( 'node' ); // -> true\n\t *\t\ttext.is( 'model:$text' ); // -> true\n\t *\t\ttext.is( 'model:node' ); // -> true\n\t *\n\t *\t\ttext.is( 'view:$text' ); // -> false\n\t *\t\ttext.is( 'documentSelection' ); // -> false\n\t *\n\t * {@link module:engine/model/node~Node#is Check the entire list of model objects} which implement the `is()` method.\n\t *\n\t * **Note:** Until version 20.0.0 this method wasn't accepting `'$text'` type. The legacy `'text'` type is still\n\t * accepted for backward compatibility.\n\t *\n\t * @param {String} type Type to check.\n\t * @returns {Boolean}\n\t */\n\tis( type ) {\n\t\treturn type === '$text' || type === 'model:$text' ||\n\t\t\t// This are legacy values kept for backward compatibility.\n\t\t\ttype === 'text' || type === 'model:text' ||\n\t\t\t// From super.is(). This is highly utilised method and cannot call super. See ckeditor/ckeditor5#6529.\n\t\t\ttype === 'node' || type === 'model:node';\n\t}\n\n\t/**\n\t * Converts `Text` instance to plain object and returns it.\n\t *\n\t * @returns {Object} `Text` instance converted to plain object.\n\t */\n\ttoJSON() {\n\t\tconst json = super.toJSON();\n\n\t\tjson.data = this.data;\n\n\t\treturn json;\n\t}\n\n\t/**\n\t * Creates a copy of this text node and returns it. Created text node has same text data and attributes as original text node.\n\t *\n\t * @protected\n\t * @returns {module:engine/model/text~Text} `Text` instance created using given plain object.\n\t */\n\t_clone() {\n\t\treturn new Text( this.data, this.getAttributes() );\n\t}\n\n\t/**\n\t * Creates a `Text` instance from given plain object (i.e. parsed JSON string).\n\t *\n\t * @param {Object} json Plain object to be converted to `Text`.\n\t * @returns {module:engine/model/text~Text} `Text` instance created using given plain object.\n\t */\n\tstatic fromJSON( json ) {\n\t\treturn new Text( json.data, json.attributes );\n\t}\n\n\t// @if CK_DEBUG_ENGINE // toString() {\n\t// @if CK_DEBUG_ENGINE // \treturn `#${ this.data }`;\n\t// @if CK_DEBUG_ENGINE // }\n\n\t// @if CK_DEBUG_ENGINE // logExtended() {\n\t// @if CK_DEBUG_ENGINE // \tconsole.log( `ModelText: ${ this }, attrs: ${ convertMapToStringifiedObject( this.getAttributes() ) }` );\n\t// @if CK_DEBUG_ENGINE // }\n\n\t// @if CK_DEBUG_ENGINE // log() {\n\t// @if CK_DEBUG_ENGINE // \tconsole.log( 'ModelText: ' + this );\n\t// @if CK_DEBUG_ENGINE // }\n}\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module engine/model/textproxy\n */\n\nimport CKEditorError from '@ckeditor/ckeditor5-utils/src/ckeditorerror';\n\n// @if CK_DEBUG_ENGINE // const { convertMapToStringifiedObject } = require( '../dev-utils/utils' );\n\n/**\n * `TextProxy` represents a part of {@link module:engine/model/text~Text text node}.\n *\n * Since {@link module:engine/model/position~Position positions} can be placed between characters of a text node,\n * {@link module:engine/model/range~Range ranges} may contain only parts of text nodes. When {@link module:engine/model/range~Range#getItems\n * getting items}\n * contained in such range, we need to represent a part of that text node, since returning the whole text node would be incorrect.\n * `TextProxy` solves this issue.\n *\n * `TextProxy` has an API similar to {@link module:engine/model/text~Text Text} and allows to do most of the common tasks performed\n * on model nodes.\n *\n * **Note:** Some `TextProxy` instances may represent whole text node, not just a part of it.\n * See {@link module:engine/model/textproxy~TextProxy#isPartial}.\n *\n * **Note:** `TextProxy` is not an instance of {@link module:engine/model/node~Node node}. Keep this in mind when using it as a\n * parameter of methods.\n *\n * **Note:** `TextProxy` is a readonly interface. If you want to perform changes on model data represented by a `TextProxy`\n * use {@link module:engine/model/writer~Writer model writer API}.\n *\n * **Note:** `TextProxy` instances are created on the fly, basing on the current state of model. Because of this, it is\n * highly unrecommended to store references to `TextProxy` instances. `TextProxy` instances are not refreshed when\n * model changes, so they might get invalidated. Instead, consider creating {@link module:engine/model/liveposition~LivePosition live\n * position}.\n *\n * `TextProxy` instances are created by {@link module:engine/model/treewalker~TreeWalker model tree walker}. You should not need to create\n * an instance of this class by your own.\n */\nexport default class TextProxy {\n\t/**\n\t * Creates a text proxy.\n\t *\n\t * @protected\n\t * @param {module:engine/model/text~Text} textNode Text node which part is represented by this text proxy.\n\t * @param {Number} offsetInText Offset in {@link module:engine/model/textproxy~TextProxy#textNode text node} from which the text proxy\n\t * starts.\n\t * @param {Number} length Text proxy length, that is how many text node's characters, starting from `offsetInText` it represents.\n\t * @constructor\n\t */\n\tconstructor( textNode, offsetInText, length ) {\n\t\t/**\n\t\t * Text node which part is represented by this text proxy.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:engine/model/text~Text}\n\t\t */\n\t\tthis.textNode = textNode;\n\n\t\tif ( offsetInText < 0 || offsetInText > textNode.offsetSize ) {\n\t\t\t/**\n\t\t\t * Given `offsetInText` value is incorrect.\n\t\t\t *\n\t\t\t * @error model-textproxy-wrong-offsetintext\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'model-textproxy-wrong-offsetintext', this );\n\t\t}\n\n\t\tif ( length < 0 || offsetInText + length > textNode.offsetSize ) {\n\t\t\t/**\n\t\t\t * Given `length` value is incorrect.\n\t\t\t *\n\t\t\t * @error model-textproxy-wrong-length\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'model-textproxy-wrong-length', this );\n\t\t}\n\n\t\t/**\n\t\t * Text data represented by this text proxy.\n\t\t *\n\t\t * @readonly\n\t\t * @member {String}\n\t\t */\n\t\tthis.data = textNode.data.substring( offsetInText, offsetInText + length );\n\n\t\t/**\n\t\t * Offset in {@link module:engine/model/textproxy~TextProxy#textNode text node} from which the text proxy starts.\n\t\t *\n\t\t * @readonly\n\t\t * @member {Number}\n\t\t */\n\t\tthis.offsetInText = offsetInText;\n\t}\n\n\t/**\n\t * Offset at which this text proxy starts in it's parent.\n\t *\n\t * @see module:engine/model/node~Node#startOffset\n\t * @readonly\n\t * @type {Number}\n\t */\n\tget startOffset() {\n\t\treturn this.textNode.startOffset !== null ? this.textNode.startOffset + this.offsetInText : null;\n\t}\n\n\t/**\n\t * Offset size of this text proxy. Equal to the number of characters represented by the text proxy.\n\t *\n\t * @see module:engine/model/node~Node#offsetSize\n\t * @readonly\n\t * @type {Number}\n\t */\n\tget offsetSize() {\n\t\treturn this.data.length;\n\t}\n\n\t/**\n\t * Offset at which this text proxy ends in it's parent.\n\t *\n\t * @see module:engine/model/node~Node#endOffset\n\t * @readonly\n\t * @type {Number}\n\t */\n\tget endOffset() {\n\t\treturn this.startOffset !== null ? this.startOffset + this.offsetSize : null;\n\t}\n\n\t/**\n\t * Flag indicating whether `TextProxy` instance covers only part of the original {@link module:engine/model/text~Text text node}\n\t * (`true`) or the whole text node (`false`).\n\t *\n\t * This is `false` when text proxy starts at the very beginning of {@link module:engine/model/textproxy~TextProxy#textNode textNode}\n\t * ({@link module:engine/model/textproxy~TextProxy#offsetInText offsetInText} equals `0`) and text proxy sizes is equal to\n\t * text node size.\n\t *\n\t * @readonly\n\t * @type {Boolean}\n\t */\n\tget isPartial() {\n\t\treturn this.offsetSize !== this.textNode.offsetSize;\n\t}\n\n\t/**\n\t * Parent of this text proxy, which is same as parent of text node represented by this text proxy.\n\t *\n\t * @readonly\n\t * @type {module:engine/model/element~Element|module:engine/model/documentfragment~DocumentFragment|null}\n\t */\n\tget parent() {\n\t\treturn this.textNode.parent;\n\t}\n\n\t/**\n\t * Root of this text proxy, which is same as root of text node represented by this text proxy.\n\t *\n\t * @readonly\n\t * @type {module:engine/model/node~Node|module:engine/model/documentfragment~DocumentFragment}\n\t */\n\tget root() {\n\t\treturn this.textNode.root;\n\t}\n\n\t/**\n\t * Checks whether this object is of the given.\n\t *\n\t *\t\ttextProxy.is( '$textProxy' ); // -> true\n\t *\t\ttextProxy.is( 'model:$textProxy' ); // -> true\n\t *\n\t *\t\ttextProxy.is( 'view:$textProxy' ); // -> false\n\t *\t\ttextProxy.is( 'range' ); // -> false\n\t *\n\t * {@link module:engine/model/node~Node#is Check the entire list of model objects} which implement the `is()` method.\n\t *\n\t * **Note:** Until version 20.0.0 this method wasn't accepting `'$textProxy'` type. The legacy `'textProxt'` type is still\n\t * accepted for backward compatibility.\n\t *\n\t * @param {String} type Type to check.\n\t * @returns {Boolean}\n\t */\n\tis( type ) {\n\t\treturn type === '$textProxy' || type === 'model:$textProxy' ||\n\t\t\t// This are legacy values kept for backward compatibility.\n\t\t\ttype === 'textProxy' || type === 'model:textProxy';\n\t}\n\n\t/**\n\t * Gets path to this text proxy.\n\t *\n\t * @see module:engine/model/node~Node#getPath\n\t * @returns {Array.<Number>}\n\t */\n\tgetPath() {\n\t\tconst path = this.textNode.getPath();\n\n\t\tif ( path.length > 0 ) {\n\t\t\tpath[ path.length - 1 ] += this.offsetInText;\n\t\t}\n\n\t\treturn path;\n\t}\n\n\t/**\n\t * Returns ancestors array of this text proxy.\n\t *\n\t * @param {Object} options Options object.\n\t * @param {Boolean} [options.includeSelf=false] When set to `true` this text proxy will be also included in parent's array.\n\t * @param {Boolean} [options.parentFirst=false] When set to `true`, array will be sorted from text proxy parent to root element,\n\t * otherwise root element will be the first item in the array.\n\t * @returns {Array} Array with ancestors.\n\t */\n\tgetAncestors( options = { includeSelf: false, parentFirst: false } ) {\n\t\tconst ancestors = [];\n\t\tlet parent = options.includeSelf ? this : this.parent;\n\n\t\twhile ( parent ) {\n\t\t\tancestors[ options.parentFirst ? 'push' : 'unshift' ]( parent );\n\t\t\tparent = parent.parent;\n\t\t}\n\n\t\treturn ancestors;\n\t}\n\n\t/**\n\t * Checks if this text proxy has an attribute for given key.\n\t *\n\t * @param {String} key Key of attribute to check.\n\t * @returns {Boolean} `true` if attribute with given key is set on text proxy, `false` otherwise.\n\t */\n\thasAttribute( key ) {\n\t\treturn this.textNode.hasAttribute( key );\n\t}\n\n\t/**\n\t * Gets an attribute value for given key or `undefined` if that attribute is not set on text proxy.\n\t *\n\t * @param {String} key Key of attribute to look for.\n\t * @returns {*} Attribute value or `undefined`.\n\t */\n\tgetAttribute( key ) {\n\t\treturn this.textNode.getAttribute( key );\n\t}\n\n\t/**\n\t * Returns iterator that iterates over this node's attributes. Attributes are returned as arrays containing two\n\t * items. First one is attribute key and second is attribute value.\n\t *\n\t * This format is accepted by native `Map` object and also can be passed in `Node` constructor.\n\t *\n\t * @returns {Iterable.<*>}\n\t */\n\tgetAttributes() {\n\t\treturn this.textNode.getAttributes();\n\t}\n\n\t/**\n\t * Returns iterator that iterates over this node's attribute keys.\n\t *\n\t * @returns {Iterable.<String>}\n\t */\n\tgetAttributeKeys() {\n\t\treturn this.textNode.getAttributeKeys();\n\t}\n\n\t// @if CK_DEBUG_ENGINE // toString() {\n\t// @if CK_DEBUG_ENGINE // \treturn `#${ this.data }`;\n\t// @if CK_DEBUG_ENGINE // }\n\n\t// @if CK_DEBUG_ENGINE // log() {\n\t// @if CK_DEBUG_ENGINE // \tconsole.log( 'ModelTextProxy: ' + this );\n\t// @if CK_DEBUG_ENGINE // }\n\n\t// @if CK_DEBUG_ENGINE // logExtended() {\n\t// @if CK_DEBUG_ENGINE // \tconsole.log( `ModelTextProxy: ${ this }, ` +\n\t// @if CK_DEBUG_ENGINE // \t\t`attrs: ${ convertMapToStringifiedObject( this.getAttributes() ) }` );\n\t// @if CK_DEBUG_ENGINE // }\n}\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module engine/model/nodelist\n */\n\nimport Node from './node';\nimport CKEditorError from '@ckeditor/ckeditor5-utils/src/ckeditorerror';\n\n/**\n * Provides an interface to operate on a list of {@link module:engine/model/node~Node nodes}. `NodeList` is used internally\n * in classes like {@link module:engine/model/element~Element Element}\n * or {@link module:engine/model/documentfragment~DocumentFragment DocumentFragment}.\n */\nexport default class NodeList {\n\t/**\n\t * Creates an empty node list.\n\t *\n\t * @protected\n\t * @param {Iterable.<module:engine/model/node~Node>} nodes Nodes contained in this node list.\n\t */\n\tconstructor( nodes ) {\n\t\t/**\n\t\t * Nodes contained in this node list.\n\t\t *\n\t\t * @private\n\t\t * @member {Array.<module:engine/model/node~Node>}\n\t\t */\n\t\tthis._nodes = [];\n\n\t\tif ( nodes ) {\n\t\t\tthis._insertNodes( 0, nodes );\n\t\t}\n\t}\n\n\t/**\n\t * Iterable interface.\n\t *\n\t * Iterates over all nodes contained inside this node list.\n\t *\n\t * @returns {Iterable.<module:engine/model/node~Node>}\n\t */\n\t[ Symbol.iterator ]() {\n\t\treturn this._nodes[ Symbol.iterator ]();\n\t}\n\n\t/**\n\t * Number of nodes contained inside this node list.\n\t *\n\t * @readonly\n\t * @type {Number}\n\t */\n\tget length() {\n\t\treturn this._nodes.length;\n\t}\n\n\t/**\n\t * Sum of {@link module:engine/model/node~Node#offsetSize offset sizes} of all nodes contained inside this node list.\n\t *\n\t * @readonly\n\t * @type {Number}\n\t */\n\tget maxOffset() {\n\t\treturn this._nodes.reduce( ( sum, node ) => sum + node.offsetSize, 0 );\n\t}\n\n\t/**\n\t * Gets the node at the given index. Returns `null` if incorrect index was passed.\n\t *\n\t * @param {Number} index Index of node.\n\t * @returns {module:engine/model/node~Node|null} Node at given index.\n\t */\n\tgetNode( index ) {\n\t\treturn this._nodes[ index ] || null;\n\t}\n\n\t/**\n\t * Returns an index of the given node. Returns `null` if given node is not inside this node list.\n\t *\n\t * @param {module:engine/model/node~Node} node Child node to look for.\n\t * @returns {Number|null} Child node's index.\n\t */\n\tgetNodeIndex( node ) {\n\t\tconst index = this._nodes.indexOf( node );\n\n\t\treturn index == -1 ? null : index;\n\t}\n\n\t/**\n\t * Returns the starting offset of given node. Starting offset is equal to the sum of\n\t * {@link module:engine/model/node~Node#offsetSize offset sizes} of all nodes that are before this node in this node list.\n\t *\n\t * @param {module:engine/model/node~Node} node Node to look for.\n\t * @returns {Number|null} Node's starting offset.\n\t */\n\tgetNodeStartOffset( node ) {\n\t\tconst index = this.getNodeIndex( node );\n\n\t\treturn index === null ? null : this._nodes.slice( 0, index ).reduce( ( sum, node ) => sum + node.offsetSize, 0 );\n\t}\n\n\t/**\n\t * Converts index to offset in node list.\n\t *\n\t * Returns starting offset of a node that is at given index. Throws {@link module:utils/ckeditorerror~CKEditorError CKEditorError}\n\t * `model-nodelist-index-out-of-bounds` if given index is less than `0` or more than {@link #length}.\n\t *\n\t * @param {Number} index Node's index.\n\t * @returns {Number} Node's starting offset.\n\t */\n\tindexToOffset( index ) {\n\t\tif ( index == this._nodes.length ) {\n\t\t\treturn this.maxOffset;\n\t\t}\n\n\t\tconst node = this._nodes[ index ];\n\n\t\tif ( !node ) {\n\t\t\t/**\n\t\t\t * Given index cannot be found in the node list.\n\t\t\t *\n\t\t\t * @error model-nodelist-index-out-of-bounds\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'model-nodelist-index-out-of-bounds', this );\n\t\t}\n\n\t\treturn this.getNodeStartOffset( node );\n\t}\n\n\t/**\n\t * Converts offset in node list to index.\n\t *\n\t * Returns index of a node that occupies given offset. Throws {@link module:utils/ckeditorerror~CKEditorError CKEditorError}\n\t * `model-nodelist-offset-out-of-bounds` if given offset is less than `0` or more than {@link #maxOffset}.\n\t *\n\t * @param {Number} offset Offset to look for.\n\t * @returns {Number} Index of a node that occupies given offset.\n\t */\n\toffsetToIndex( offset ) {\n\t\tlet totalOffset = 0;\n\n\t\tfor ( const node of this._nodes ) {\n\t\t\tif ( offset >= totalOffset && offset < totalOffset + node.offsetSize ) {\n\t\t\t\treturn this.getNodeIndex( node );\n\t\t\t}\n\n\t\t\ttotalOffset += node.offsetSize;\n\t\t}\n\n\t\tif ( totalOffset != offset ) {\n\t\t\t/**\n\t\t\t * Given offset cannot be found in the node list.\n\t\t\t *\n\t\t\t * @error model-nodelist-offset-out-of-bounds\n\t\t\t * @param {Number} offset\n\t\t\t * @param {module:engine/model/nodelist~NodeList} nodeList Stringified node list.\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'model-nodelist-offset-out-of-bounds',\n\t\t\t\tthis,\n\t\t\t\t{\n\t\t\t\t\toffset,\n\t\t\t\t\tnodeList: this\n\t\t\t\t}\n\t\t\t);\n\t\t}\n\n\t\treturn this.length;\n\t}\n\n\t/**\n\t * Inserts given nodes at given index.\n\t *\n\t * @protected\n\t * @param {Number} index Index at which nodes should be inserted.\n\t * @param {Iterable.<module:engine/model/node~Node>} nodes Nodes to be inserted.\n\t */\n\t_insertNodes( index, nodes ) {\n\t\t// Validation.\n\t\tfor ( const node of nodes ) {\n\t\t\tif ( !( node instanceof Node ) ) {\n\t\t\t\t/**\n\t\t\t\t * Trying to insert an object which is not a Node instance.\n\t\t\t\t *\n\t\t\t\t * @error model-nodelist-insertnodes-not-node\n\t\t\t\t */\n\t\t\t\tthrow new CKEditorError( 'model-nodelist-insertnodes-not-node', this );\n\t\t\t}\n\t\t}\n\n\t\tthis._nodes.splice( index, 0, ...nodes );\n\t}\n\n\t/**\n\t * Removes one or more nodes starting at the given index.\n\t *\n\t * @protected\n\t * @param {Number} indexStart Index of the first node to remove.\n\t * @param {Number} [howMany=1] Number of nodes to remove.\n\t * @returns {Array.<module:engine/model/node~Node>} Array containing removed nodes.\n\t */\n\t_removeNodes( indexStart, howMany = 1 ) {\n\t\treturn this._nodes.splice( indexStart, howMany );\n\t}\n\n\t/**\n\t * Converts `NodeList` instance to an array containing nodes that were inserted in the node list. Nodes\n\t * are also converted to their plain object representation.\n\t *\n\t * @returns {Array.<module:engine/model/node~Node>} `NodeList` instance converted to `Array`.\n\t */\n\ttoJSON() {\n\t\treturn this._nodes.map( node => node.toJSON() );\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module engine/model/element\n */\n\nimport Node from './node';\nimport NodeList from './nodelist';\nimport Text from './text';\nimport TextProxy from './textproxy';\nimport isIterable from '@ckeditor/ckeditor5-utils/src/isiterable';\n\n// @if CK_DEBUG_ENGINE // const { stringifyMap, convertMapToStringifiedObject, convertMapToTags } = require( '../dev-utils/utils' );\n\n/**\n * Model element. Type of {@link module:engine/model/node~Node node} that has a {@link module:engine/model/element~Element#name name} and\n * {@link module:engine/model/element~Element#getChildren child nodes}.\n *\n * **Important**: see {@link module:engine/model/node~Node} to read about restrictions using `Element` and `Node` API.\n *\n * @extends module:engine/model/node~Node\n */\nexport default class Element extends Node {\n\t/**\n\t * Creates a model element.\n\t *\n\t * **Note:** Constructor of this class shouldn't be used directly in the code.\n\t * Use the {@link module:engine/model/writer~Writer#createElement} method instead.\n\t *\n\t * @protected\n\t * @param {String} name Element's name.\n\t * @param {Object} [attrs] Element's attributes. See {@link module:utils/tomap~toMap} for a list of accepted values.\n\t * @param {module:engine/model/node~Node|Iterable.<module:engine/model/node~Node>} [children]\n\t * One or more nodes to be inserted as children of created element.\n\t */\n\tconstructor( name, attrs, children ) {\n\t\tsuper( attrs );\n\n\t\t/**\n\t\t * Element name.\n\t\t *\n\t\t * @readonly\n\t\t * @member {String} module:engine/model/element~Element#name\n\t\t */\n\t\tthis.name = name;\n\n\t\t/**\n\t\t * List of children nodes.\n\t\t *\n\t\t * @private\n\t\t * @member {module:engine/model/nodelist~NodeList} module:engine/model/element~Element#_children\n\t\t */\n\t\tthis._children = new NodeList();\n\n\t\tif ( children ) {\n\t\t\tthis._insertChild( 0, children );\n\t\t}\n\t}\n\n\t/**\n\t * Number of this element's children.\n\t *\n\t * @readonly\n\t * @type {Number}\n\t */\n\tget childCount() {\n\t\treturn this._children.length;\n\t}\n\n\t/**\n\t * Sum of {@link module:engine/model/node~Node#offsetSize offset sizes} of all of this element's children.\n\t *\n\t * @readonly\n\t * @type {Number}\n\t */\n\tget maxOffset() {\n\t\treturn this._children.maxOffset;\n\t}\n\n\t/**\n\t * Is `true` if there are no nodes inside this element, `false` otherwise.\n\t *\n\t * @readonly\n\t * @type {Boolean}\n\t */\n\tget isEmpty() {\n\t\treturn this.childCount === 0;\n\t}\n\n\t/**\n\t * Checks whether this object is of the given.\n\t *\n\t *\t\telement.is( 'element' ); // -> true\n\t *\t\telement.is( 'node' ); // -> true\n\t *\t\telement.is( 'model:element' ); // -> true\n\t *\t\telement.is( 'model:node' ); // -> true\n\t *\n\t *\t\telement.is( 'view:element' ); // -> false\n\t *\t\telement.is( 'documentSelection' ); // -> false\n\t *\n\t * Assuming that the object being checked is an element, you can also check its\n\t * {@link module:engine/model/element~Element#name name}:\n\t *\n\t *\t\telement.is( 'element', 'image' ); // -> true if this is an <image> element\n\t *\t\telement.is( 'element', 'image' ); // -> same as above\n\t *\t\ttext.is( 'element', 'image' ); -> false\n\t *\n\t * {@link module:engine/model/node~Node#is Check the entire list of model objects} which implement the `is()` method.\n\t *\n\t * @param {String} type Type to check.\n\t * @param {String} [name] Element name.\n\t * @returns {Boolean}\n\t */\n\tis( type, name = null ) {\n\t\tif ( !name ) {\n\t\t\treturn type === 'element' || type === 'model:element' ||\n\t\t\t\t// From super.is(). This is highly utilised method and cannot call super. See ckeditor/ckeditor5#6529.\n\t\t\t\ttype === 'node' || type === 'model:node';\n\t\t}\n\n\t\treturn name === this.name && ( type === 'element' || type === 'model:element' );\n\t}\n\n\t/**\n\t * Gets the child at the given index.\n\t *\n\t * @param {Number} index Index of child.\n\t * @returns {module:engine/model/node~Node} Child node.\n\t */\n\tgetChild( index ) {\n\t\treturn this._children.getNode( index );\n\t}\n\n\t/**\n\t * Returns an iterator that iterates over all of this element's children.\n\t *\n\t * @returns {Iterable.<module:engine/model/node~Node>}\n\t */\n\tgetChildren() {\n\t\treturn this._children[ Symbol.iterator ]();\n\t}\n\n\t/**\n\t * Returns an index of the given child node. Returns `null` if given node is not a child of this element.\n\t *\n\t * @param {module:engine/model/node~Node} node Child node to look for.\n\t * @returns {Number} Child node's index in this element.\n\t */\n\tgetChildIndex( node ) {\n\t\treturn this._children.getNodeIndex( node );\n\t}\n\n\t/**\n\t * Returns the starting offset of given child. Starting offset is equal to the sum of\n\t * {@link module:engine/model/node~Node#offsetSize offset sizes} of all node's siblings that are before it. Returns `null` if\n\t * given node is not a child of this element.\n\t *\n\t * @param {module:engine/model/node~Node} node Child node to look for.\n\t * @returns {Number} Child node's starting offset.\n\t */\n\tgetChildStartOffset( node ) {\n\t\treturn this._children.getNodeStartOffset( node );\n\t}\n\n\t/**\n\t * Returns index of a node that occupies given offset. If given offset is too low, returns `0`. If given offset is\n\t * too high, returns {@link module:engine/model/element~Element#getChildIndex index after last child}.\n\t *\n\t *\t\tconst textNode = new Text( 'foo' );\n\t *\t\tconst pElement = new Element( 'p' );\n\t *\t\tconst divElement = new Element( [ textNode, pElement ] );\n\t *\t\tdivElement.offsetToIndex( -1 ); // Returns 0, because offset is too low.\n\t *\t\tdivElement.offsetToIndex( 0 ); // Returns 0, because offset 0 is taken by `textNode` which is at index 0.\n\t *\t\tdivElement.offsetToIndex( 1 ); // Returns 0, because `textNode` has `offsetSize` equal to 3, so it occupies offset 1 too.\n\t *\t\tdivElement.offsetToIndex( 2 ); // Returns 0.\n\t *\t\tdivElement.offsetToIndex( 3 ); // Returns 1.\n\t *\t\tdivElement.offsetToIndex( 4 ); // Returns 2. There are no nodes at offset 4, so last available index is returned.\n\t *\n\t * @param {Number} offset Offset to look for.\n\t * @returns {Number}\n\t */\n\toffsetToIndex( offset ) {\n\t\treturn this._children.offsetToIndex( offset );\n\t}\n\n\t/**\n\t * Returns a descendant node by its path relative to this element.\n\t *\n\t *\t\t// <this>a<b>c</b></this>\n\t *\t\tthis.getNodeByPath( [ 0 ] );     // -> \"a\"\n\t *\t\tthis.getNodeByPath( [ 1 ] );     // -> <b>\n\t *\t\tthis.getNodeByPath( [ 1, 0 ] );  // -> \"c\"\n\t *\n\t * @param {Array.<Number>} relativePath Path of the node to find, relative to this element.\n\t * @returns {module:engine/model/node~Node}\n\t */\n\tgetNodeByPath( relativePath ) {\n\t\tlet node = this; // eslint-disable-line consistent-this\n\n\t\tfor ( const index of relativePath ) {\n\t\t\tnode = node.getChild( node.offsetToIndex( index ) );\n\t\t}\n\n\t\treturn node;\n\t}\n\n\t/**\n\t * Returns the parent element of the given name. Returns null if the element is not inside the desired parent.\n\t *\n\t * @param {String} parentName The name of the parent element to find.\n\t * @param {Object} [options] Options object.\n\t * @param {Boolean} [options.includeSelf=false] When set to `true` this node will be also included while searching.\n\t * @returns {module:engine/model/element~Element|null}\n\t */\n\tfindAncestor( parentName, options = { includeSelf: false } ) {\n\t\tlet parent = options.includeSelf ? this : this.parent;\n\n\t\twhile ( parent ) {\n\t\t\tif ( parent.name === parentName ) {\n\t\t\t\treturn parent;\n\t\t\t}\n\n\t\t\tparent = parent.parent;\n\t\t}\n\n\t\treturn null;\n\t}\n\n\t/**\n\t * Converts `Element` instance to plain object and returns it. Takes care of converting all of this element's children.\n\t *\n\t * @returns {Object} `Element` instance converted to plain object.\n\t */\n\ttoJSON() {\n\t\tconst json = super.toJSON();\n\n\t\tjson.name = this.name;\n\n\t\tif ( this._children.length > 0 ) {\n\t\t\tjson.children = [];\n\n\t\t\tfor ( const node of this._children ) {\n\t\t\t\tjson.children.push( node.toJSON() );\n\t\t\t}\n\t\t}\n\n\t\treturn json;\n\t}\n\n\t/**\n\t * Creates a copy of this element and returns it. Created element has the same name and attributes as the original element.\n\t * If clone is deep, the original element's children are also cloned. If not, then empty element is returned.\n\t *\n\t * @protected\n\t * @param {Boolean} [deep=false] If set to `true` clones element and all its children recursively. When set to `false`,\n\t * element will be cloned without any child.\n\t */\n\t_clone( deep = false ) {\n\t\tconst children = deep ? Array.from( this._children ).map( node => node._clone( true ) ) : null;\n\n\t\treturn new Element( this.name, this.getAttributes(), children );\n\t}\n\n\t/**\n\t * {@link module:engine/model/element~Element#_insertChild Inserts} one or more nodes at the end of this element.\n\t *\n\t * @see module:engine/model/writer~Writer#append\n\t * @protected\n\t * @param {module:engine/model/item~Item|Iterable.<module:engine/model/item~Item>} nodes Nodes to be inserted.\n\t */\n\t_appendChild( nodes ) {\n\t\tthis._insertChild( this.childCount, nodes );\n\t}\n\n\t/**\n\t * Inserts one or more nodes at the given index and sets {@link module:engine/model/node~Node#parent parent} of these nodes\n\t * to this element.\n\t *\n\t * @see module:engine/model/writer~Writer#insert\n\t * @protected\n\t * @param {Number} index Index at which nodes should be inserted.\n\t * @param {module:engine/model/item~Item|Iterable.<module:engine/model/item~Item>} items Items to be inserted.\n\t */\n\t_insertChild( index, items ) {\n\t\tconst nodes = normalize( items );\n\n\t\tfor ( const node of nodes ) {\n\t\t\t// If node that is being added to this element is already inside another element, first remove it from the old parent.\n\t\t\tif ( node.parent !== null ) {\n\t\t\t\tnode._remove();\n\t\t\t}\n\n\t\t\tnode.parent = this;\n\t\t}\n\n\t\tthis._children._insertNodes( index, nodes );\n\t}\n\n\t/**\n\t * Removes one or more nodes starting at the given index and sets\n\t * {@link module:engine/model/node~Node#parent parent} of these nodes to `null`.\n\t *\n\t * @see module:engine/model/writer~Writer#remove\n\t * @protected\n\t * @param {Number} index Index of the first node to remove.\n\t * @param {Number} [howMany=1] Number of nodes to remove.\n\t * @returns {Array.<module:engine/model/node~Node>} Array containing removed nodes.\n\t */\n\t_removeChildren( index, howMany = 1 ) {\n\t\tconst nodes = this._children._removeNodes( index, howMany );\n\n\t\tfor ( const node of nodes ) {\n\t\t\tnode.parent = null;\n\t\t}\n\n\t\treturn nodes;\n\t}\n\n\t/**\n\t * Creates an `Element` instance from given plain object (i.e. parsed JSON string).\n\t * Converts `Element` children to proper nodes.\n\t *\n\t * @param {Object} json Plain object to be converted to `Element`.\n\t * @returns {module:engine/model/element~Element} `Element` instance created using given plain object.\n\t */\n\tstatic fromJSON( json ) {\n\t\tlet children = null;\n\n\t\tif ( json.children ) {\n\t\t\tchildren = [];\n\n\t\t\tfor ( const child of json.children ) {\n\t\t\t\tif ( child.name ) {\n\t\t\t\t\t// If child has name property, it is an Element.\n\t\t\t\t\tchildren.push( Element.fromJSON( child ) );\n\t\t\t\t} else {\n\t\t\t\t\t// Otherwise, it is a Text node.\n\t\t\t\t\tchildren.push( Text.fromJSON( child ) );\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\n\t\treturn new Element( json.name, json.attributes, children );\n\t}\n\n\t// @if CK_DEBUG_ENGINE // toString() {\n\t// @if CK_DEBUG_ENGINE // \treturn `<${ this.rootName || this.name }>`;\n\t// @if CK_DEBUG_ENGINE // }\n\n\t// @if CK_DEBUG_ENGINE // log() {\n\t// @if CK_DEBUG_ENGINE // \tconsole.log( 'ModelElement: ' + this );\n\t// @if CK_DEBUG_ENGINE // }\n\n\t// @if CK_DEBUG_ENGINE // logExtended() {\n\t// @if CK_DEBUG_ENGINE // \tconsole.log( `ModelElement: ${ this }, ${ this.childCount } children,\n\t// @if CK_DEBUG_ENGINE //\t\tattrs: ${ convertMapToStringifiedObject( this.getAttributes() ) }` );\n\t// @if CK_DEBUG_ENGINE // }\n\n\t// @if CK_DEBUG_ENGINE // logAll() {\n\t// @if CK_DEBUG_ENGINE // \tconsole.log( '--------------------' );\n\t// @if CK_DEBUG_ENGINE //\n\t// @if CK_DEBUG_ENGINE // \tthis.logExtended();\n\t// @if CK_DEBUG_ENGINE //\tconsole.log( 'List of children:' );\n\t// @if CK_DEBUG_ENGINE //\n\t// @if CK_DEBUG_ENGINE // \tfor ( const child of this.getChildren() ) {\n\t// @if CK_DEBUG_ENGINE // \t\tchild.log();\n\t// @if CK_DEBUG_ENGINE // \t}\n\t// @if CK_DEBUG_ENGINE // }\n\n\t// @if CK_DEBUG_ENGINE // printTree( level = 0) {\n\t// @if CK_DEBUG_ENGINE // \tlet string = '';\n\n\t// @if CK_DEBUG_ENGINE // \tstring += '\\t'.repeat( level );\n\t// @if CK_DEBUG_ENGINE // \tstring += `<${ this.rootName || this.name }${ convertMapToTags( this.getAttributes() ) }>`;\n\n\t// @if CK_DEBUG_ENGINE // \tfor ( const child of this.getChildren() ) {\n\t// @if CK_DEBUG_ENGINE // \t\tstring += '\\n';\n\n\t// @if CK_DEBUG_ENGINE // \t\tif ( child.is( '$text' ) ) {\n\t// @if CK_DEBUG_ENGINE // \t\t\tconst textAttrs = convertMapToTags( child._attrs );\n\n\t// @if CK_DEBUG_ENGINE // \t\t\tstring += '\\t'.repeat( level + 1 );\n\n\t// @if CK_DEBUG_ENGINE // \t\t\tif ( textAttrs !== '' ) {\n\t// @if CK_DEBUG_ENGINE // \t\t\t\tstring += `<$text${ textAttrs }>` + child.data + '</$text>';\n\t// @if CK_DEBUG_ENGINE // \t\t\t} else {\n\t// @if CK_DEBUG_ENGINE // \t\t\t\tstring += child.data;\n\t// @if CK_DEBUG_ENGINE // \t\t\t}\n\t// @if CK_DEBUG_ENGINE // \t\t} else {\n\t// @if CK_DEBUG_ENGINE // \t\t\tstring += child.printTree( level + 1 );\n\t// @if CK_DEBUG_ENGINE // \t\t}\n\t// @if CK_DEBUG_ENGINE // \t}\n\n\t// @if CK_DEBUG_ENGINE // \tif ( this.childCount ) {\n\t// @if CK_DEBUG_ENGINE // \t\tstring += '\\n' + '\\t'.repeat( level );\n\t// @if CK_DEBUG_ENGINE // \t}\n\n\t// @if CK_DEBUG_ENGINE // \tstring += `</${ this.rootName || this.name }>`;\n\n\t// @if CK_DEBUG_ENGINE // \treturn string;\n\t// @if CK_DEBUG_ENGINE // }\n\n\t// @if CK_DEBUG_ENGINE // logTree() {\n\t// @if CK_DEBUG_ENGINE // \tconsole.log( this.printTree() );\n\t// @if CK_DEBUG_ENGINE // }\n}\n\n// Converts strings to Text and non-iterables to arrays.\n//\n// @param {String|module:engine/model/item~Item|Iterable.<String|module:engine/model/item~Item>}\n// @returns {Iterable.<module:engine/model/node~Node>}\nfunction normalize( nodes ) {\n\t// Separate condition because string is iterable.\n\tif ( typeof nodes == 'string' ) {\n\t\treturn [ new Text( nodes ) ];\n\t}\n\n\tif ( !isIterable( nodes ) ) {\n\t\tnodes = [ nodes ];\n\t}\n\n\t// Array.from to enable .map() on non-arrays.\n\treturn Array.from( nodes )\n\t\t.map( node => {\n\t\t\tif ( typeof node == 'string' ) {\n\t\t\t\treturn new Text( node );\n\t\t\t}\n\n\t\t\tif ( node instanceof TextProxy ) {\n\t\t\t\treturn new Text( node.data, node.getAttributes() );\n\t\t\t}\n\n\t\t\treturn node;\n\t\t} );\n}\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module engine/model/treewalker\n */\n\nimport Text from './text';\nimport TextProxy from './textproxy';\nimport Element from './element';\nimport {\n\tdefault as Position,\n\tgetTextNodeAtPosition,\n\tgetNodeAfterPosition,\n\tgetNodeBeforePosition\n} from './position';\nimport CKEditorError from '@ckeditor/ckeditor5-utils/src/ckeditorerror';\n\n/**\n * Position iterator class. It allows to iterate forward and backward over the document.\n */\nexport default class TreeWalker {\n\t/**\n\t * Creates a range iterator. All parameters are optional, but you have to specify either `boundaries` or `startPosition`.\n\t *\n\t * @constructor\n\t * @param {Object} [options={}] Object with configuration.\n\t * @param {'forward'|'backward'} [options.direction='forward'] Walking direction.\n\t * @param {module:engine/model/range~Range} [options.boundaries=null] Range to define boundaries of the iterator.\n\t * @param {module:engine/model/position~Position} [options.startPosition] Starting position.\n\t * @param {Boolean} [options.singleCharacters=false] Flag indicating whether all consecutive characters with the same attributes\n\t * should be returned one by one as multiple {@link module:engine/model/textproxy~TextProxy} (`true`) objects or as one\n\t * {@link module:engine/model/textproxy~TextProxy} (`false`).\n\t * @param {Boolean} [options.shallow=false] Flag indicating whether iterator should enter elements or not. If the\n\t * iterator is shallow child nodes of any iterated node will not be returned along with `elementEnd` tag.\n\t * @param {Boolean} [options.ignoreElementEnd=false] Flag indicating whether iterator should ignore `elementEnd`\n\t * tags. If the option is true walker will not return a parent node of start position. If this option is `true`\n\t * each {@link module:engine/model/element~Element} will be returned once, while if the option is `false` they might be returned\n\t * twice: for `'elementStart'` and `'elementEnd'`.\n\t */\n\tconstructor( options = {} ) {\n\t\tif ( !options.boundaries && !options.startPosition ) {\n\t\t\t/**\n\t\t\t * Neither boundaries nor starting position of a `TreeWalker` have been defined.\n\t\t\t *\n\t\t\t * @error model-tree-walker-no-start-position\n\t\t\t */\n\t\t\tthrow new CKEditorError(\n\t\t\t\t'model-tree-walker-no-start-position',\n\t\t\t\tnull\n\t\t\t);\n\t\t}\n\n\t\tconst direction = options.direction || 'forward';\n\n\t\tif ( direction != 'forward' && direction != 'backward' ) {\n\t\t\t/**\n\t\t\t * Only `backward` and `forward` direction allowed.\n\t\t\t *\n\t\t\t * @error model-tree-walker-unknown-direction\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'model-tree-walker-unknown-direction', options, { direction } );\n\t\t}\n\n\t\t/**\n\t\t * Walking direction. Defaults `'forward'`.\n\t\t *\n\t\t * @readonly\n\t\t * @member {'backward'|'forward'} module:engine/model/treewalker~TreeWalker#direction\n\t\t */\n\t\tthis.direction = direction;\n\n\t\t/**\n\t\t * Iterator boundaries.\n\t\t *\n\t\t * When the iterator is walking `'forward'` on the end of boundary or is walking `'backward'`\n\t\t * on the start of boundary, then `{ done: true }` is returned.\n\t\t *\n\t\t * If boundaries are not defined they are set before first and after last child of the root node.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:engine/model/range~Range} module:engine/model/treewalker~TreeWalker#boundaries\n\t\t */\n\t\tthis.boundaries = options.boundaries || null;\n\n\t\t/**\n\t\t * Iterator position. This is always static position, even if the initial position was a\n\t\t * {@link module:engine/model/liveposition~LivePosition live position}. If start position is not defined then position depends\n\t\t * on {@link #direction}. If direction is `'forward'` position starts form the beginning, when direction\n\t\t * is `'backward'` position starts from the end.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:engine/model/position~Position} module:engine/model/treewalker~TreeWalker#position\n\t\t */\n\t\tif ( options.startPosition ) {\n\t\t\tthis.position = options.startPosition.clone();\n\t\t} else {\n\t\t\tthis.position = Position._createAt( this.boundaries[ this.direction == 'backward' ? 'end' : 'start' ] );\n\t\t}\n\n\t\t// Reset position stickiness in case it was set to other value, as the stickiness is kept after cloning.\n\t\tthis.position.stickiness = 'toNone';\n\n\t\t/**\n\t\t * Flag indicating whether all consecutive characters with the same attributes should be\n\t\t * returned as one {@link module:engine/model/textproxy~TextProxy} (`true`) or one by one (`false`).\n\t\t *\n\t\t * @readonly\n\t\t * @member {Boolean} module:engine/model/treewalker~TreeWalker#singleCharacters\n\t\t */\n\t\tthis.singleCharacters = !!options.singleCharacters;\n\n\t\t/**\n\t\t * Flag indicating whether iterator should enter elements or not. If the iterator is shallow child nodes of any\n\t\t * iterated node will not be returned along with `elementEnd` tag.\n\t\t *\n\t\t * @readonly\n\t\t * @member {Boolean} module:engine/model/treewalker~TreeWalker#shallow\n\t\t */\n\t\tthis.shallow = !!options.shallow;\n\n\t\t/**\n\t\t * Flag indicating whether iterator should ignore `elementEnd` tags. If the option is true walker will not\n\t\t * return a parent node of the start position. If this option is `true` each {@link module:engine/model/element~Element} will\n\t\t * be returned once, while if the option is `false` they might be returned twice:\n\t\t * for `'elementStart'` and `'elementEnd'`.\n\t\t *\n\t\t * @readonly\n\t\t * @member {Boolean} module:engine/model/treewalker~TreeWalker#ignoreElementEnd\n\t\t */\n\t\tthis.ignoreElementEnd = !!options.ignoreElementEnd;\n\n\t\t/**\n\t\t * Start boundary cached for optimization purposes.\n\t\t *\n\t\t * @private\n\t\t * @member {module:engine/model/element~Element} module:engine/model/treewalker~TreeWalker#_boundaryStartParent\n\t\t */\n\t\tthis._boundaryStartParent = this.boundaries ? this.boundaries.start.parent : null;\n\n\t\t/**\n\t\t * End boundary cached for optimization purposes.\n\t\t *\n\t\t * @private\n\t\t * @member {module:engine/model/element~Element} module:engine/model/treewalker~TreeWalker#_boundaryEndParent\n\t\t */\n\t\tthis._boundaryEndParent = this.boundaries ? this.boundaries.end.parent : null;\n\n\t\t/**\n\t\t * Parent of the most recently visited node. Cached for optimization purposes.\n\t\t *\n\t\t * @private\n\t\t * @member {module:engine/model/element~Element|module:engine/model/documentfragment~DocumentFragment}\n\t\t * module:engine/model/treewalker~TreeWalker#_visitedParent\n\t\t */\n\t\tthis._visitedParent = this.position.parent;\n\t}\n\n\t/**\n\t * Iterable interface.\n\t *\n\t * @returns {Iterable.<module:engine/model/treewalker~TreeWalkerValue>}\n\t */\n\t[ Symbol.iterator ]() {\n\t\treturn this;\n\t}\n\n\t/**\n\t * Moves {@link #position} in the {@link #direction} skipping values as long as the callback function returns `true`.\n\t *\n\t * For example:\n\t *\n\t * \t\twalker.skip( value => value.type == 'text' ); // <paragraph>[]foo</paragraph> -> <paragraph>foo[]</paragraph>\n\t * \t\twalker.skip( () => true ); // Move the position to the end: <paragraph>[]foo</paragraph> -> <paragraph>foo</paragraph>[]\n\t * \t\twalker.skip( () => false ); // Do not move the position.\n\t *\n\t * @param {Function} skip Callback function. Gets {@link module:engine/model/treewalker~TreeWalkerValue} and should\n\t * return `true` if the value should be skipped or `false` if not.\n\t */\n\tskip( skip ) {\n\t\tlet done, value, prevPosition, prevVisitedParent;\n\n\t\tdo {\n\t\t\tprevPosition = this.position;\n\t\t\tprevVisitedParent = this._visitedParent;\n\n\t\t\t( { done, value } = this.next() );\n\t\t} while ( !done && skip( value ) );\n\n\t\tif ( !done ) {\n\t\t\tthis.position = prevPosition;\n\t\t\tthis._visitedParent = prevVisitedParent;\n\t\t}\n\t}\n\n\t/**\n\t * Gets the next tree walker's value.\n\t *\n\t * @returns {module:engine/model/treewalker~TreeWalkerValue} Next tree walker's value.\n\t */\n\tnext() {\n\t\tif ( this.direction == 'forward' ) {\n\t\t\treturn this._next();\n\t\t} else {\n\t\t\treturn this._previous();\n\t\t}\n\t}\n\n\t/**\n\t * Makes a step forward in model. Moves the {@link #position} to the next position and returns the encountered value.\n\t *\n\t * @private\n\t * @returns {Object}\n\t * @returns {Boolean} return.done True if iterator is done.\n\t * @returns {module:engine/model/treewalker~TreeWalkerValue} return.value Information about taken step.\n\t */\n\t_next() {\n\t\tconst previousPosition = this.position;\n\t\tconst position = this.position.clone();\n\t\tconst parent = this._visitedParent;\n\n\t\t// We are at the end of the root.\n\t\tif ( parent.parent === null && position.offset === parent.maxOffset ) {\n\t\t\treturn { done: true };\n\t\t}\n\n\t\t// We reached the walker boundary.\n\t\tif ( parent === this._boundaryEndParent && position.offset == this.boundaries.end.offset ) {\n\t\t\treturn { done: true };\n\t\t}\n\n\t\t// Get node just after the current position.\n\t\t// Use a highly optimized version instead of checking the text node first and then getting the node after. See #6582.\n\t\tconst positionParent = position.parent;\n\t\tconst textNodeAtPosition = getTextNodeAtPosition( position, positionParent );\n\t\tconst node = textNodeAtPosition ? textNodeAtPosition : getNodeAfterPosition( position, positionParent, textNodeAtPosition );\n\n\t\tif ( node instanceof Element ) {\n\t\t\tif ( !this.shallow ) {\n\t\t\t\t// Manual operations on path internals for optimization purposes. Here and in the rest of the method.\n\t\t\t\tposition.path.push( 0 );\n\t\t\t\tthis._visitedParent = node;\n\t\t\t} else {\n\t\t\t\tposition.offset++;\n\t\t\t}\n\n\t\t\tthis.position = position;\n\n\t\t\treturn formatReturnValue( 'elementStart', node, previousPosition, position, 1 );\n\t\t} else if ( node instanceof Text ) {\n\t\t\tlet charactersCount;\n\n\t\t\tif ( this.singleCharacters ) {\n\t\t\t\tcharactersCount = 1;\n\t\t\t} else {\n\t\t\t\tlet offset = node.endOffset;\n\n\t\t\t\tif ( this._boundaryEndParent == parent && this.boundaries.end.offset < offset ) {\n\t\t\t\t\toffset = this.boundaries.end.offset;\n\t\t\t\t}\n\n\t\t\t\tcharactersCount = offset - position.offset;\n\t\t\t}\n\n\t\t\tconst offsetInTextNode = position.offset - node.startOffset;\n\t\t\tconst item = new TextProxy( node, offsetInTextNode, charactersCount );\n\n\t\t\tposition.offset += charactersCount;\n\t\t\tthis.position = position;\n\n\t\t\treturn formatReturnValue( 'text', item, previousPosition, position, charactersCount );\n\t\t} else {\n\t\t\t// `node` is not set, we reached the end of current `parent`.\n\t\t\tposition.path.pop();\n\t\t\tposition.offset++;\n\t\t\tthis.position = position;\n\t\t\tthis._visitedParent = parent.parent;\n\n\t\t\tif ( this.ignoreElementEnd ) {\n\t\t\t\treturn this._next();\n\t\t\t} else {\n\t\t\t\treturn formatReturnValue( 'elementEnd', parent, previousPosition, position );\n\t\t\t}\n\t\t}\n\t}\n\n\t/**\n\t * Makes a step backward in model. Moves the {@link #position} to the previous position and returns the encountered value.\n\t *\n\t * @private\n\t * @returns {Object}\n\t * @returns {Boolean} return.done True if iterator is done.\n\t * @returns {module:engine/model/treewalker~TreeWalkerValue} return.value Information about taken step.\n\t */\n\t_previous() {\n\t\tconst previousPosition = this.position;\n\t\tconst position = this.position.clone();\n\t\tconst parent = this._visitedParent;\n\n\t\t// We are at the beginning of the root.\n\t\tif ( parent.parent === null && position.offset === 0 ) {\n\t\t\treturn { done: true };\n\t\t}\n\n\t\t// We reached the walker boundary.\n\t\tif ( parent == this._boundaryStartParent && position.offset == this.boundaries.start.offset ) {\n\t\t\treturn { done: true };\n\t\t}\n\n\t\t// Get node just before the current position.\n\t\t// Use a highly optimized version instead of checking the text node first and then getting the node before. See #6582.\n\t\tconst positionParent = position.parent;\n\t\tconst textNodeAtPosition = getTextNodeAtPosition( position, positionParent );\n\t\tconst node = textNodeAtPosition ? textNodeAtPosition : getNodeBeforePosition( position, positionParent, textNodeAtPosition );\n\n\t\tif ( node instanceof Element ) {\n\t\t\tposition.offset--;\n\n\t\t\tif ( !this.shallow ) {\n\t\t\t\tposition.path.push( node.maxOffset );\n\t\t\t\tthis.position = position;\n\t\t\t\tthis._visitedParent = node;\n\n\t\t\t\tif ( this.ignoreElementEnd ) {\n\t\t\t\t\treturn this._previous();\n\t\t\t\t} else {\n\t\t\t\t\treturn formatReturnValue( 'elementEnd', node, previousPosition, position );\n\t\t\t\t}\n\t\t\t} else {\n\t\t\t\tthis.position = position;\n\n\t\t\t\treturn formatReturnValue( 'elementStart', node, previousPosition, position, 1 );\n\t\t\t}\n\t\t} else if ( node instanceof Text ) {\n\t\t\tlet charactersCount;\n\n\t\t\tif ( this.singleCharacters ) {\n\t\t\t\tcharactersCount = 1;\n\t\t\t} else {\n\t\t\t\tlet offset = node.startOffset;\n\n\t\t\t\tif ( this._boundaryStartParent == parent && this.boundaries.start.offset > offset ) {\n\t\t\t\t\toffset = this.boundaries.start.offset;\n\t\t\t\t}\n\n\t\t\t\tcharactersCount = position.offset - offset;\n\t\t\t}\n\n\t\t\tconst offsetInTextNode = position.offset - node.startOffset;\n\t\t\tconst item = new TextProxy( node, offsetInTextNode - charactersCount, charactersCount );\n\n\t\t\tposition.offset -= charactersCount;\n\t\t\tthis.position = position;\n\n\t\t\treturn formatReturnValue( 'text', item, previousPosition, position, charactersCount );\n\t\t} else {\n\t\t\t// `node` is not set, we reached the beginning of current `parent`.\n\t\t\tposition.path.pop();\n\t\t\tthis.position = position;\n\t\t\tthis._visitedParent = parent.parent;\n\n\t\t\treturn formatReturnValue( 'elementStart', parent, previousPosition, position, 1 );\n\t\t}\n\t}\n}\n\nfunction formatReturnValue( type, item, previousPosition, nextPosition, length ) {\n\treturn {\n\t\tdone: false,\n\t\tvalue: {\n\t\t\ttype,\n\t\t\titem,\n\t\t\tpreviousPosition,\n\t\t\tnextPosition,\n\t\t\tlength\n\t\t}\n\t};\n}\n\n/**\n * Type of the step made by {@link module:engine/model/treewalker~TreeWalker}.\n * Possible values: `'elementStart'` if walker is at the beginning of a node, `'elementEnd'` if walker is at the end of node,\n * `'character'` if walker traversed over a character, or `'text'` if walker traversed over multiple characters (available in\n * character merging mode, see {@link module:engine/model/treewalker~TreeWalker#constructor}).\n *\n * @typedef {'elementStart'|'elementEnd'|'character'|'text'} module:engine/model/treewalker~TreeWalkerValueType\n */\n\n/**\n * Object returned by {@link module:engine/model/treewalker~TreeWalker} when traversing tree model.\n *\n * @typedef {Object} module:engine/model/treewalker~TreeWalkerValue\n * @property {module:engine/model/treewalker~TreeWalkerValueType} type\n * @property {module:engine/model/item~Item} item Item between old and new positions of {@link module:engine/model/treewalker~TreeWalker}.\n * @property {module:engine/model/position~Position} previousPosition Previous position of the iterator.\n * * Forward iteration: For `'elementEnd'` it is the last position inside the element. For all other types it is the\n * position before the item.\n * * Backward iteration: For `'elementStart'` it is the first position inside the element. For all other types it is\n * the position after item.\n * @property {module:engine/model/position~Position} nextPosition Next position of the iterator.\n * * Forward iteration: For `'elementStart'` it is the first position inside the element. For all other types it is\n * the position after the item.\n * * Backward iteration: For `'elementEnd'` it is last position inside element. For all other types it is the position\n * before the item.\n * @property {Number} [length] Length of the item. For `'elementStart'` and `'character'` it is 1. For `'text'` it is\n * the length of the text. For `'elementEnd'` it is `undefined`.\n */\n\n/**\n * Tree walking directions.\n *\n * @typedef {'forward'|'backward'} module:engine/model/treewalker~TreeWalkerDirection\n */\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module engine/model/position\n */\n\nimport TreeWalker from './treewalker';\nimport compareArrays from '@ckeditor/ckeditor5-utils/src/comparearrays';\nimport CKEditorError from '@ckeditor/ckeditor5-utils/src/ckeditorerror';\n\n// To check if component is loaded more than once.\nimport '@ckeditor/ckeditor5-utils/src/version';\n\n/**\n * Represents a position in the model tree.\n *\n * A position is represented by its {@link module:engine/model/position~Position#root} and\n * a {@link module:engine/model/position~Position#path} in that root.\n *\n * You can create position instances via its constructor or the `createPosition*()` factory methods of\n * {@link module:engine/model/model~Model} and {@link module:engine/model/writer~Writer}.\n *\n * **Note:** Position is based on offsets, not indexes. This means that a position between two text nodes\n * `foo` and `bar` has offset `3`, not `1`. See {@link module:engine/model/position~Position#path} for more information.\n *\n * Since a position in the model is represented by a {@link module:engine/model/position~Position#root position root} and\n * {@link module:engine/model/position~Position#path position path} it is possible to create positions placed in non-existing places.\n * This requirement is important for operational transformation algorithms.\n *\n * Also, {@link module:engine/model/operation/operation~Operation operations}\n * kept in the {@link module:engine/model/document~Document#history document history}\n * are storing positions (and ranges) which were correct when those operations were applied, but may not be correct\n * after the document has changed.\n *\n * When changes are applied to the model, it may also happen that {@link module:engine/model/position~Position#parent position parent}\n * will change even if position path has not changed. Keep in mind, that if a position leads to non-existing element,\n * {@link module:engine/model/position~Position#parent} and some other properties and methods will throw errors.\n *\n * In most cases, position with wrong path is caused by an error in code, but it is sometimes needed, as described above.\n */\nexport default class Position {\n\t/**\n\t * Creates a position.\n\t *\n\t * @param {module:engine/model/element~Element|module:engine/model/documentfragment~DocumentFragment} root Root of the position.\n\t * @param {Array.<Number>} path Position path. See {@link module:engine/model/position~Position#path}.\n\t * @param {module:engine/model/position~PositionStickiness} [stickiness='toNone'] Position stickiness.\n\t * See {@link module:engine/model/position~PositionStickiness}.\n\t */\n\tconstructor( root, path, stickiness = 'toNone' ) {\n\t\tif ( !root.is( 'element' ) && !root.is( 'documentFragment' ) ) {\n\t\t\t/**\n\t\t\t * Position root is invalid.\n\t\t\t *\n\t\t\t * Positions can only be anchored in elements or document fragments.\n\t\t\t *\n\t\t\t * @error model-position-root-invalid\n\t\t\t */\n\t\t\tthrow new CKEditorError(\n\t\t\t\t'model-position-root-invalid',\n\t\t\t\troot\n\t\t\t);\n\t\t}\n\n\t\tif ( !( path instanceof Array ) || path.length === 0 ) {\n\t\t\t/**\n\t\t\t * Position path must be an array with at least one item.\n\t\t\t *\n\t\t\t * @error model-position-path-incorrect-format\n\t\t\t * @param path\n\t\t\t */\n\t\t\tthrow new CKEditorError(\n\t\t\t\t'model-position-path-incorrect-format',\n\t\t\t\troot,\n\t\t\t\t{ path }\n\t\t\t);\n\t\t}\n\n\t\t// Normalize the root and path when element (not root) is passed.\n\t\tif ( root.is( 'rootElement' ) ) {\n\t\t\tpath = path.slice();\n\t\t} else {\n\t\t\tpath = [ ...root.getPath(), ...path ];\n\t\t\troot = root.root;\n\t\t}\n\n\t\t/**\n\t\t * Root of the position path.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:engine/model/element~Element|module:engine/model/documentfragment~DocumentFragment}\n\t\t * module:engine/model/position~Position#root\n\t\t */\n\t\tthis.root = root;\n\n\t\t/**\n\t\t * Position of the node in the tree. **Path contains offsets, not indexes.**\n\t\t *\n\t\t * Position can be placed before, after or in a {@link module:engine/model/node~Node node} if that node has\n\t\t * {@link module:engine/model/node~Node#offsetSize} greater than `1`. Items in position path are\n\t\t * {@link module:engine/model/node~Node#startOffset starting offsets} of position ancestors, starting from direct root children,\n\t\t * down to the position offset in it's parent.\n\t\t *\n\t\t *\t\t ROOT\n\t\t *\t\t  |- P            before: [ 0 ]         after: [ 1 ]\n\t\t *\t\t  |- UL           before: [ 1 ]         after: [ 2 ]\n\t\t *\t\t     |- LI        before: [ 1, 0 ]      after: [ 1, 1 ]\n\t\t *\t\t     |  |- foo    before: [ 1, 0, 0 ]   after: [ 1, 0, 3 ]\n\t\t *\t\t     |- LI        before: [ 1, 1 ]      after: [ 1, 2 ]\n\t\t *\t\t        |- bar    before: [ 1, 1, 0 ]   after: [ 1, 1, 3 ]\n\t\t *\n\t\t * `foo` and `bar` are representing {@link module:engine/model/text~Text text nodes}. Since text nodes has offset size\n\t\t * greater than `1` you can place position offset between their start and end:\n\t\t *\n\t\t *\t\t ROOT\n\t\t *\t\t  |- P\n\t\t *\t\t  |- UL\n\t\t *\t\t     |- LI\n\t\t *\t\t     |  |- f^o|o  ^ has path: [ 1, 0, 1 ]   | has path: [ 1, 0, 2 ]\n\t\t *\t\t     |- LI\n\t\t *\t\t        |- b^a|r  ^ has path: [ 1, 1, 1 ]   | has path: [ 1, 1, 2 ]\n\t\t *\n\t\t * @readonly\n\t\t * @member {Array.<Number>} module:engine/model/position~Position#path\n\t\t */\n\t\tthis.path = path;\n\n\t\t/**\n\t\t * Position stickiness. See {@link module:engine/model/position~PositionStickiness}.\n\t\t *\n\t\t * @member {module:engine/model/position~PositionStickiness} module:engine/model/position~Position#stickiness\n\t\t */\n\t\tthis.stickiness = stickiness;\n\t}\n\n\t/**\n\t * Offset at which this position is located in its {@link module:engine/model/position~Position#parent parent}. It is equal\n\t * to the last item in position {@link module:engine/model/position~Position#path path}.\n\t *\n\t * @type {Number}\n\t */\n\tget offset() {\n\t\treturn this.path[ this.path.length - 1 ];\n\t}\n\n\tset offset( newOffset ) {\n\t\tthis.path[ this.path.length - 1 ] = newOffset;\n\t}\n\n\t/**\n\t * Parent element of this position.\n\t *\n\t * Keep in mind that `parent` value is calculated when the property is accessed.\n\t * If {@link module:engine/model/position~Position#path position path}\n\t * leads to a non-existing element, `parent` property will throw error.\n\t *\n\t * Also it is a good idea to cache `parent` property if it is used frequently in an algorithm (i.e. in a long loop).\n\t *\n\t * @readonly\n\t * @type {module:engine/model/element~Element|module:engine/model/documentfragment~DocumentFragment}\n\t */\n\tget parent() {\n\t\tlet parent = this.root;\n\n\t\tfor ( let i = 0; i < this.path.length - 1; i++ ) {\n\t\t\tparent = parent.getChild( parent.offsetToIndex( this.path[ i ] ) );\n\n\t\t\tif ( !parent ) {\n\t\t\t\t/**\n\t\t\t\t * The position's path is incorrect. This means that a position does not point to\n\t\t\t\t * a correct place in the tree and hence, some of its methods and getters cannot work correctly.\n\t\t\t\t *\n\t\t\t\t * **Note**: Unlike DOM and view positions, in the model, the\n\t\t\t\t * {@link module:engine/model/position~Position#parent position's parent} is always an element or a document fragment.\n\t\t\t\t * The last offset in the {@link module:engine/model/position~Position#path position's path} is the point in this element\n\t\t\t\t * where this position points.\n\t\t\t\t *\n\t\t\t\t * Read more about model positions and offsets in\n\t\t\t\t * the {@glink framework/guides/architecture/editing-engine#indexes-and-offsets Editing engine architecture guide}.\n\t\t\t\t *\n\t\t\t\t * @error model-position-path-incorrect\n\t\t\t\t * @param {module:engine/model/position~Position} position The incorrect position.\n\t\t\t\t */\n\t\t\t\tthrow new CKEditorError( 'model-position-path-incorrect', this, { position: this } );\n\t\t\t}\n\t\t}\n\n\t\tif ( parent.is( '$text' ) ) {\n\t\t\tthrow new CKEditorError( 'model-position-path-incorrect', this, { position: this } );\n\t\t}\n\n\t\treturn parent;\n\t}\n\n\t/**\n\t * Position {@link module:engine/model/position~Position#offset offset} converted to an index in position's parent node. It is\n\t * equal to the {@link module:engine/model/node~Node#index index} of a node after this position. If position is placed\n\t * in text node, position index is equal to the index of that text node.\n\t *\n\t * @readonly\n\t * @type {Number}\n\t */\n\tget index() {\n\t\treturn this.parent.offsetToIndex( this.offset );\n\t}\n\n\t/**\n\t * Returns {@link module:engine/model/text~Text text node} instance in which this position is placed or `null` if this\n\t * position is not in a text node.\n\t *\n\t * @readonly\n\t * @type {module:engine/model/text~Text|null}\n\t */\n\tget textNode() {\n\t\treturn getTextNodeAtPosition( this, this.parent );\n\t}\n\n\t/**\n\t * Node directly after this position or `null` if this position is in text node.\n\t *\n\t * @readonly\n\t * @type {module:engine/model/node~Node|null}\n\t */\n\tget nodeAfter() {\n\t\t// Cache the parent and reuse for performance reasons. See #6579 and #6582.\n\t\tconst parent = this.parent;\n\n\t\treturn getNodeAfterPosition( this, parent, getTextNodeAtPosition( this, parent ) );\n\t}\n\n\t/**\n\t * Node directly before this position or `null` if this position is in text node.\n\t *\n\t * @readonly\n\t * @type {module:engine/model/node~Node|null}\n\t */\n\tget nodeBefore() {\n\t\t// Cache the parent and reuse for performance reasons. See #6579 and #6582.\n\t\tconst parent = this.parent;\n\n\t\treturn getNodeBeforePosition( this, parent, getTextNodeAtPosition( this, parent ) );\n\t}\n\n\t/**\n\t * Is `true` if position is at the beginning of its {@link module:engine/model/position~Position#parent parent}, `false` otherwise.\n\t *\n\t * @readonly\n\t * @type {Boolean}\n\t */\n\tget isAtStart() {\n\t\treturn this.offset === 0;\n\t}\n\n\t/**\n\t * Is `true` if position is at the end of its {@link module:engine/model/position~Position#parent parent}, `false` otherwise.\n\t *\n\t * @readonly\n\t * @type {Boolean}\n\t */\n\tget isAtEnd() {\n\t\treturn this.offset == this.parent.maxOffset;\n\t}\n\n\t/**\n\t * Checks whether this position is before or after given position.\n\t *\n\t * This method is safe to use it on non-existing positions (for example during operational transformation).\n\t *\n\t * @param {module:engine/model/position~Position} otherPosition Position to compare with.\n\t * @returns {module:engine/model/position~PositionRelation}\n\t */\n\tcompareWith( otherPosition ) {\n\t\tif ( this.root != otherPosition.root ) {\n\t\t\treturn 'different';\n\t\t}\n\n\t\tconst result = compareArrays( this.path, otherPosition.path );\n\n\t\tswitch ( result ) {\n\t\t\tcase 'same':\n\t\t\t\treturn 'same';\n\n\t\t\tcase 'prefix':\n\t\t\t\treturn 'before';\n\n\t\t\tcase 'extension':\n\t\t\t\treturn 'after';\n\n\t\t\tdefault:\n\t\t\t\treturn this.path[ result ] < otherPosition.path[ result ] ? 'before' : 'after';\n\t\t}\n\t}\n\n\t/**\n\t * Gets the farthest position which matches the callback using\n\t * {@link module:engine/model/treewalker~TreeWalker TreeWalker}.\n\t *\n\t * For example:\n\t *\n\t * \t\tgetLastMatchingPosition( value => value.type == 'text' );\n\t * \t\t// <paragraph>[]foo</paragraph> -> <paragraph>foo[]</paragraph>\n\t *\n\t * \t\tgetLastMatchingPosition( value => value.type == 'text', { direction: 'backward' } );\n\t * \t\t// <paragraph>foo[]</paragraph> -> <paragraph>[]foo</paragraph>\n\t *\n\t * \t\tgetLastMatchingPosition( value => false );\n\t * \t\t// Do not move the position.\n\t *\n\t * @param {Function} skip Callback function. Gets {@link module:engine/model/treewalker~TreeWalkerValue} and should\n\t * return `true` if the value should be skipped or `false` if not.\n\t * @param {Object} options Object with configuration options. See {@link module:engine/model/treewalker~TreeWalker}.\n\t *\n\t * @returns {module:engine/model/position~Position} The position after the last item which matches the `skip` callback test.\n\t */\n\tgetLastMatchingPosition( skip, options = {} ) {\n\t\toptions.startPosition = this;\n\n\t\tconst treeWalker = new TreeWalker( options );\n\t\ttreeWalker.skip( skip );\n\n\t\treturn treeWalker.position;\n\t}\n\n\t/**\n\t * Returns a path to this position's parent. Parent path is equal to position {@link module:engine/model/position~Position#path path}\n\t * but without the last item.\n\t *\n\t * This method is safe to use it on non-existing positions (for example during operational transformation).\n\t *\n\t * @returns {Array.<Number>} Path to the parent.\n\t */\n\tgetParentPath() {\n\t\treturn this.path.slice( 0, -1 );\n\t}\n\n\t/**\n\t * Returns ancestors array of this position, that is this position's parent and its ancestors.\n\t *\n\t * @returns {Array.<module:engine/model/item~Item>} Array with ancestors.\n\t */\n\tgetAncestors() {\n\t\tconst parent = this.parent;\n\n\t\tif ( parent.is( 'documentFragment' ) ) {\n\t\t\treturn [ parent ];\n\t\t} else {\n\t\t\treturn parent.getAncestors( { includeSelf: true } );\n\t\t}\n\t}\n\n\t/**\n\t * Returns the parent element of the given name. Returns null if the position is not inside the desired parent.\n\t *\n\t * @param {String} parentName The name of the parent element to find.\n\t * @returns {module:engine/model/element~Element|null}\n\t */\n\tfindAncestor( parentName ) {\n\t\tconst parent = this.parent;\n\n\t\tif ( parent.is( 'element' ) ) {\n\t\t\treturn parent.findAncestor( parentName, { includeSelf: true } );\n\t\t}\n\n\t\treturn null;\n\t}\n\n\t/**\n\t * Returns the slice of two position {@link #path paths} which is identical. The {@link #root roots}\n\t * of these two paths must be identical.\n\t *\n\t * This method is safe to use it on non-existing positions (for example during operational transformation).\n\t *\n\t * @param {module:engine/model/position~Position} position The second position.\n\t * @returns {Array.<Number>} The common path.\n\t */\n\tgetCommonPath( position ) {\n\t\tif ( this.root != position.root ) {\n\t\t\treturn [];\n\t\t}\n\n\t\t// We find on which tree-level start and end have the lowest common ancestor\n\t\tconst cmp = compareArrays( this.path, position.path );\n\t\t// If comparison returned string it means that arrays are same.\n\t\tconst diffAt = ( typeof cmp == 'string' ) ? Math.min( this.path.length, position.path.length ) : cmp;\n\n\t\treturn this.path.slice( 0, diffAt );\n\t}\n\n\t/**\n\t * Returns an {@link module:engine/model/element~Element} or {@link module:engine/model/documentfragment~DocumentFragment}\n\t * which is a common ancestor of both positions. The {@link #root roots} of these two positions must be identical.\n\t *\n\t * @param {module:engine/model/position~Position} position The second position.\n\t * @returns {module:engine/model/element~Element|module:engine/model/documentfragment~DocumentFragment|null}\n\t */\n\tgetCommonAncestor( position ) {\n\t\tconst ancestorsA = this.getAncestors();\n\t\tconst ancestorsB = position.getAncestors();\n\n\t\tlet i = 0;\n\n\t\twhile ( ancestorsA[ i ] == ancestorsB[ i ] && ancestorsA[ i ] ) {\n\t\t\ti++;\n\t\t}\n\n\t\treturn i === 0 ? null : ancestorsA[ i - 1 ];\n\t}\n\n\t/**\n\t * Returns a new instance of `Position`, that has same {@link #parent parent} but it's offset\n\t * is shifted by `shift` value (can be a negative value).\n\t *\n\t * This method is safe to use it on non-existing positions (for example during operational transformation).\n\t *\n\t * @param {Number} shift Offset shift. Can be a negative value.\n\t * @returns {module:engine/model/position~Position} Shifted position.\n\t */\n\tgetShiftedBy( shift ) {\n\t\tconst shifted = this.clone();\n\n\t\tconst offset = shifted.offset + shift;\n\t\tshifted.offset = offset < 0 ? 0 : offset;\n\n\t\treturn shifted;\n\t}\n\n\t/**\n\t * Checks whether this position is after given position.\n\t *\n\t * This method is safe to use it on non-existing positions (for example during operational transformation).\n\t *\n\t * @see module:engine/model/position~Position#isBefore\n\t * @param {module:engine/model/position~Position} otherPosition Position to compare with.\n\t * @returns {Boolean} True if this position is after given position.\n\t */\n\tisAfter( otherPosition ) {\n\t\treturn this.compareWith( otherPosition ) == 'after';\n\t}\n\n\t/**\n\t * Checks whether this position is before given position.\n\t *\n\t * **Note:** watch out when using negation of the value returned by this method, because the negation will also\n\t * be `true` if positions are in different roots and you might not expect this. You should probably use\n\t * `a.isAfter( b ) || a.isEqual( b )` or `!a.isBefore( p ) && a.root == b.root` in most scenarios. If your\n\t * condition uses multiple `isAfter` and `isBefore` checks, build them so they do not use negated values, i.e.:\n\t *\n\t *\t\tif ( a.isBefore( b ) && c.isAfter( d ) ) {\n\t *\t\t\t// do A.\n\t *\t\t} else {\n\t *\t\t\t// do B.\n\t *\t\t}\n\t *\n\t * or, if you have only one if-branch:\n\t *\n\t *\t\tif ( !( a.isBefore( b ) && c.isAfter( d ) ) {\n\t *\t\t\t// do B.\n\t *\t\t}\n\t *\n\t * rather than:\n\t *\n\t *\t\tif ( !a.isBefore( b ) || && !c.isAfter( d ) ) {\n\t *\t\t\t// do B.\n\t *\t\t} else {\n\t *\t\t\t// do A.\n\t *\t\t}\n\t *\n\t * This method is safe to use it on non-existing positions (for example during operational transformation).\n\t *\n\t * @param {module:engine/model/position~Position} otherPosition Position to compare with.\n\t * @returns {Boolean} True if this position is before given position.\n\t */\n\tisBefore( otherPosition ) {\n\t\treturn this.compareWith( otherPosition ) == 'before';\n\t}\n\n\t/**\n\t * Checks whether this position is equal to given position.\n\t *\n\t * This method is safe to use it on non-existing positions (for example during operational transformation).\n\t *\n\t * @param {module:engine/model/position~Position} otherPosition Position to compare with.\n\t * @returns {Boolean} True if positions are same.\n\t */\n\tisEqual( otherPosition ) {\n\t\treturn this.compareWith( otherPosition ) == 'same';\n\t}\n\n\t/**\n\t * Checks whether this position is touching given position. Positions touch when there are no text nodes\n\t * or empty nodes in a range between them. Technically, those positions are not equal but in many cases\n\t * they are very similar or even indistinguishable.\n\t *\n\t * @param {module:engine/model/position~Position} otherPosition Position to compare with.\n\t * @returns {Boolean} True if positions touch.\n\t */\n\tisTouching( otherPosition ) {\n\t\tlet left = null;\n\t\tlet right = null;\n\t\tconst compare = this.compareWith( otherPosition );\n\n\t\tswitch ( compare ) {\n\t\t\tcase 'same':\n\t\t\t\treturn true;\n\n\t\t\tcase 'before':\n\t\t\t\tleft = Position._createAt( this );\n\t\t\t\tright = Position._createAt( otherPosition );\n\t\t\t\tbreak;\n\n\t\t\tcase 'after':\n\t\t\t\tleft = Position._createAt( otherPosition );\n\t\t\t\tright = Position._createAt( this );\n\t\t\t\tbreak;\n\n\t\t\tdefault:\n\t\t\t\treturn false;\n\t\t}\n\n\t\t// Cached for optimization purposes.\n\t\tlet leftParent = left.parent;\n\n\t\twhile ( left.path.length + right.path.length ) {\n\t\t\tif ( left.isEqual( right ) ) {\n\t\t\t\treturn true;\n\t\t\t}\n\n\t\t\tif ( left.path.length > right.path.length ) {\n\t\t\t\tif ( left.offset !== leftParent.maxOffset ) {\n\t\t\t\t\treturn false;\n\t\t\t\t}\n\n\t\t\t\tleft.path = left.path.slice( 0, -1 );\n\t\t\t\tleftParent = leftParent.parent;\n\t\t\t\tleft.offset++;\n\t\t\t} else {\n\t\t\t\tif ( right.offset !== 0 ) {\n\t\t\t\t\treturn false;\n\t\t\t\t}\n\n\t\t\t\tright.path = right.path.slice( 0, -1 );\n\t\t\t}\n\t\t}\n\t}\n\n\t/**\n\t * Checks whether this object is of the given.\n\t *\n\t *\t\tposition.is( 'position' ); // -> true\n\t *\t\tposition.is( 'model:position' ); // -> true\n\t *\n\t *\t\tposition.is( 'view:position' ); // -> false\n\t *\t\tposition.is( 'documentSelection' ); // -> false\n\t *\n\t * {@link module:engine/model/node~Node#is Check the entire list of model objects} which implement the `is()` method.\n\t *\n\t * @param {String} type\n\t * @returns {Boolean}\n\t */\n\tis( type ) {\n\t\treturn type === 'position' || type === 'model:position';\n\t}\n\n\t/**\n\t * Checks if two positions are in the same parent.\n\t *\n\t * This method is safe to use it on non-existing positions (for example during operational transformation).\n\t *\n\t * @param {module:engine/model/position~Position} position Position to compare with.\n\t * @returns {Boolean} `true` if positions have the same parent, `false` otherwise.\n\t */\n\thasSameParentAs( position ) {\n\t\tif ( this.root !== position.root ) {\n\t\t\treturn false;\n\t\t}\n\n\t\tconst thisParentPath = this.getParentPath();\n\t\tconst posParentPath = position.getParentPath();\n\n\t\treturn compareArrays( thisParentPath, posParentPath ) == 'same';\n\t}\n\n\t/**\n\t * Returns a copy of this position that is transformed by given `operation`.\n\t *\n\t * The new position's parameters are updated accordingly to the effect of the `operation`.\n\t *\n\t * For example, if `n` nodes are inserted before the position, the returned position {@link ~Position#offset} will be\n\t * increased by `n`. If the position was in a merged element, it will be accordingly moved to the new element, etc.\n\t *\n\t * This method is safe to use it on non-existing positions (for example during operational transformation).\n\t *\n\t * @param {module:engine/model/operation/operation~Operation} operation Operation to transform by.\n\t * @returns {module:engine/model/position~Position} Transformed position.\n\t */\n\tgetTransformedByOperation( operation ) {\n\t\tlet result;\n\n\t\tswitch ( operation.type ) {\n\t\t\tcase 'insert':\n\t\t\t\tresult = this._getTransformedByInsertOperation( operation );\n\t\t\t\tbreak;\n\t\t\tcase 'move':\n\t\t\tcase 'remove':\n\t\t\tcase 'reinsert':\n\t\t\t\tresult = this._getTransformedByMoveOperation( operation );\n\t\t\t\tbreak;\n\t\t\tcase 'split':\n\t\t\t\tresult = this._getTransformedBySplitOperation( operation );\n\t\t\t\tbreak;\n\t\t\tcase 'merge':\n\t\t\t\tresult = this._getTransformedByMergeOperation( operation );\n\t\t\t\tbreak;\n\t\t\tdefault:\n\t\t\t\tresult = Position._createAt( this );\n\t\t\t\tbreak;\n\t\t}\n\n\t\treturn result;\n\t}\n\n\t/**\n\t * Returns a copy of this position transformed by an insert operation.\n\t *\n\t * @protected\n\t * @param {module:engine/model/operation/insertoperation~InsertOperation} operation\n\t * @returns {module:engine/model/position~Position}\n\t */\n\t_getTransformedByInsertOperation( operation ) {\n\t\treturn this._getTransformedByInsertion( operation.position, operation.howMany );\n\t}\n\n\t/**\n\t * Returns a copy of this position transformed by a move operation.\n\t *\n\t * @protected\n\t * @param {module:engine/model/operation/moveoperation~MoveOperation} operation\n\t * @returns {module:engine/model/position~Position}\n\t */\n\t_getTransformedByMoveOperation( operation ) {\n\t\treturn this._getTransformedByMove( operation.sourcePosition, operation.targetPosition, operation.howMany );\n\t}\n\n\t/**\n\t * Returns a copy of this position transformed by a split operation.\n\t *\n\t * @protected\n\t * @param {module:engine/model/operation/splitoperation~SplitOperation} operation\n\t * @returns {module:engine/model/position~Position}\n\t */\n\t_getTransformedBySplitOperation( operation ) {\n\t\tconst movedRange = operation.movedRange;\n\n\t\tconst isContained = movedRange.containsPosition( this ) ||\n\t\t\t( movedRange.start.isEqual( this ) && this.stickiness == 'toNext' );\n\n\t\tif ( isContained ) {\n\t\t\treturn this._getCombined( operation.splitPosition, operation.moveTargetPosition );\n\t\t} else {\n\t\t\tif ( operation.graveyardPosition ) {\n\t\t\t\treturn this._getTransformedByMove( operation.graveyardPosition, operation.insertionPosition, 1 );\n\t\t\t} else {\n\t\t\t\treturn this._getTransformedByInsertion( operation.insertionPosition, 1 );\n\t\t\t}\n\t\t}\n\t}\n\n\t/**\n\t * Returns a copy of this position transformed by merge operation.\n\t *\n\t * @protected\n\t * @param {module:engine/model/operation/mergeoperation~MergeOperation} operation\n\t * @returns {module:engine/model/position~Position}\n\t */\n\t_getTransformedByMergeOperation( operation ) {\n\t\tconst movedRange = operation.movedRange;\n\t\tconst isContained = movedRange.containsPosition( this ) || movedRange.start.isEqual( this );\n\n\t\tlet pos;\n\n\t\tif ( isContained ) {\n\t\t\tpos = this._getCombined( operation.sourcePosition, operation.targetPosition );\n\n\t\t\tif ( operation.sourcePosition.isBefore( operation.targetPosition ) ) {\n\t\t\t\t// Above happens during OT when the merged element is moved before the merged-to element.\n\t\t\t\tpos = pos._getTransformedByDeletion( operation.deletionPosition, 1 );\n\t\t\t}\n\t\t} else if ( this.isEqual( operation.deletionPosition ) ) {\n\t\t\tpos = Position._createAt( operation.deletionPosition );\n\t\t} else {\n\t\t\tpos = this._getTransformedByMove( operation.deletionPosition, operation.graveyardPosition, 1 );\n\t\t}\n\n\t\treturn pos;\n\t}\n\n\t/**\n\t * Returns a copy of this position that is updated by removing `howMany` nodes starting from `deletePosition`.\n\t * It may happen that this position is in a removed node. If that is the case, `null` is returned instead.\n\t *\n\t * @protected\n\t * @param {module:engine/model/position~Position} deletePosition Position before the first removed node.\n\t * @param {Number} howMany How many nodes are removed.\n\t * @returns {module:engine/model/position~Position|null} Transformed position or `null`.\n\t */\n\t_getTransformedByDeletion( deletePosition, howMany ) {\n\t\tconst transformed = Position._createAt( this );\n\n\t\t// This position can't be affected if deletion was in a different root.\n\t\tif ( this.root != deletePosition.root ) {\n\t\t\treturn transformed;\n\t\t}\n\n\t\tif ( compareArrays( deletePosition.getParentPath(), this.getParentPath() ) == 'same' ) {\n\t\t\t// If nodes are removed from the node that is pointed by this position...\n\t\t\tif ( deletePosition.offset < this.offset ) {\n\t\t\t\t// And are removed from before an offset of that position...\n\t\t\t\tif ( deletePosition.offset + howMany > this.offset ) {\n\t\t\t\t\t// Position is in removed range, it's no longer in the tree.\n\t\t\t\t\treturn null;\n\t\t\t\t} else {\n\t\t\t\t\t// Decrement the offset accordingly.\n\t\t\t\t\ttransformed.offset -= howMany;\n\t\t\t\t}\n\t\t\t}\n\t\t} else if ( compareArrays( deletePosition.getParentPath(), this.getParentPath() ) == 'prefix' ) {\n\t\t\t// If nodes are removed from a node that is on a path to this position...\n\t\t\tconst i = deletePosition.path.length - 1;\n\n\t\t\tif ( deletePosition.offset <= this.path[ i ] ) {\n\t\t\t\t// And are removed from before next node of that path...\n\t\t\t\tif ( deletePosition.offset + howMany > this.path[ i ] ) {\n\t\t\t\t\t// If the next node of that path is removed return null\n\t\t\t\t\t// because the node containing this position got removed.\n\t\t\t\t\treturn null;\n\t\t\t\t} else {\n\t\t\t\t\t// Otherwise, decrement index on that path.\n\t\t\t\t\ttransformed.path[ i ] -= howMany;\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\n\t\treturn transformed;\n\t}\n\n\t/**\n\t * Returns a copy of this position that is updated by inserting `howMany` nodes at `insertPosition`.\n\t *\n\t * @protected\n\t * @param {module:engine/model/position~Position} insertPosition Position where nodes are inserted.\n\t * @param {Number} howMany How many nodes are inserted.\n\t * @returns {module:engine/model/position~Position} Transformed position.\n\t */\n\t_getTransformedByInsertion( insertPosition, howMany ) {\n\t\tconst transformed = Position._createAt( this );\n\n\t\t// This position can't be affected if insertion was in a different root.\n\t\tif ( this.root != insertPosition.root ) {\n\t\t\treturn transformed;\n\t\t}\n\n\t\tif ( compareArrays( insertPosition.getParentPath(), this.getParentPath() ) == 'same' ) {\n\t\t\t// If nodes are inserted in the node that is pointed by this position...\n\t\t\tif ( insertPosition.offset < this.offset || ( insertPosition.offset == this.offset && this.stickiness != 'toPrevious' ) ) {\n\t\t\t\t// And are inserted before an offset of that position...\n\t\t\t\t// \"Push\" this positions offset.\n\t\t\t\ttransformed.offset += howMany;\n\t\t\t}\n\t\t} else if ( compareArrays( insertPosition.getParentPath(), this.getParentPath() ) == 'prefix' ) {\n\t\t\t// If nodes are inserted in a node that is on a path to this position...\n\t\t\tconst i = insertPosition.path.length - 1;\n\n\t\t\tif ( insertPosition.offset <= this.path[ i ] ) {\n\t\t\t\t// And are inserted before next node of that path...\n\t\t\t\t// \"Push\" the index on that path.\n\t\t\t\ttransformed.path[ i ] += howMany;\n\t\t\t}\n\t\t}\n\n\t\treturn transformed;\n\t}\n\n\t/**\n\t * Returns a copy of this position that is updated by moving `howMany` nodes from `sourcePosition` to `targetPosition`.\n\t *\n\t * @protected\n\t * @param {module:engine/model/position~Position} sourcePosition Position before the first element to move.\n\t * @param {module:engine/model/position~Position} targetPosition Position where moved elements will be inserted.\n\t * @param {Number} howMany How many consecutive nodes to move, starting from `sourcePosition`.\n\t * @returns {module:engine/model/position~Position} Transformed position.\n\t */\n\t_getTransformedByMove( sourcePosition, targetPosition, howMany ) {\n\t\t// Update target position, as it could be affected by nodes removal.\n\t\ttargetPosition = targetPosition._getTransformedByDeletion( sourcePosition, howMany );\n\n\t\tif ( sourcePosition.isEqual( targetPosition ) ) {\n\t\t\t// If `targetPosition` is equal to `sourcePosition` this isn't really any move. Just return position as it is.\n\t\t\treturn Position._createAt( this );\n\t\t}\n\n\t\t// Moving a range removes nodes from their original position. We acknowledge this by proper transformation.\n\t\tconst transformed = this._getTransformedByDeletion( sourcePosition, howMany );\n\n\t\tconst isMoved = transformed === null ||\n\t\t\t( sourcePosition.isEqual( this ) && this.stickiness == 'toNext' ) ||\n\t\t\t( sourcePosition.getShiftedBy( howMany ).isEqual( this ) && this.stickiness == 'toPrevious' );\n\n\t\tif ( isMoved ) {\n\t\t\t// This position is inside moved range (or sticks to it).\n\t\t\t// In this case, we calculate a combination of this position, move source position and target position.\n\t\t\treturn this._getCombined( sourcePosition, targetPosition );\n\t\t} else {\n\t\t\t// This position is not inside a removed range.\n\t\t\t//\n\t\t\t// In next step, we simply reflect inserting `howMany` nodes, which might further affect the position.\n\t\t\treturn transformed._getTransformedByInsertion( targetPosition, howMany );\n\t\t}\n\t}\n\n\t/**\n\t * Returns a new position that is a combination of this position and given positions.\n\t *\n\t * The combined position is a copy of this position transformed by moving a range starting at `source` position\n\t * to the `target` position. It is expected that this position is inside the moved range.\n\t *\n\t * Example:\n\t *\n\t *\t\tlet original = model.createPositionFromPath( root, [ 2, 3, 1 ] );\n\t *\t\tlet source = model.createPositionFromPath( root, [ 2, 2 ] );\n\t *\t\tlet target = model.createPositionFromPath( otherRoot, [ 1, 1, 3 ] );\n\t *\t\toriginal._getCombined( source, target ); // path is [ 1, 1, 4, 1 ], root is `otherRoot`\n\t *\n\t * Explanation:\n\t *\n\t * We have a position `[ 2, 3, 1 ]` and move some nodes from `[ 2, 2 ]` to `[ 1, 1, 3 ]`. The original position\n\t * was inside moved nodes and now should point to the new place. The moved nodes will be after\n\t * positions `[ 1, 1, 3 ]`, `[ 1, 1, 4 ]`, `[ 1, 1, 5 ]`. Since our position was in the second moved node,\n\t * the transformed position will be in a sub-tree of a node at `[ 1, 1, 4 ]`. Looking at original path, we\n\t * took care of `[ 2, 3 ]` part of it. Now we have to add the rest of the original path to the transformed path.\n\t * Finally, the transformed position will point to `[ 1, 1, 4, 1 ]`.\n\t *\n\t * @protected\n\t * @param {module:engine/model/position~Position} source Beginning of the moved range.\n\t * @param {module:engine/model/position~Position} target Position where the range is moved.\n\t * @returns {module:engine/model/position~Position} Combined position.\n\t */\n\t_getCombined( source, target ) {\n\t\tconst i = source.path.length - 1;\n\n\t\t// The first part of a path to combined position is a path to the place where nodes were moved.\n\t\tconst combined = Position._createAt( target );\n\t\tcombined.stickiness = this.stickiness;\n\n\t\t// Then we have to update the rest of the path.\n\n\t\t// Fix the offset because this position might be after `from` position and we have to reflect that.\n\t\tcombined.offset = combined.offset + this.path[ i ] - source.offset;\n\n\t\t// Then, add the rest of the path.\n\t\t// If this position is at the same level as `from` position nothing will get added.\n\t\tcombined.path = [ ...combined.path, ...this.path.slice( i + 1 ) ];\n\n\t\treturn combined;\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\ttoJSON() {\n\t\treturn {\n\t\t\troot: this.root.toJSON(),\n\t\t\tpath: Array.from( this.path ),\n\t\t\tstickiness: this.stickiness\n\t\t};\n\t}\n\n\t/**\n\t * Returns a new position that is equal to current position.\n\t *\n\t * @returns {module:engine/model/position~Position}\n\t */\n\tclone() {\n\t\treturn new this.constructor( this.root, this.path, this.stickiness );\n\t}\n\n\t/**\n\t * Creates position at the given location. The location can be specified as:\n\t *\n\t * * a {@link module:engine/model/position~Position position},\n\t * * parent element and offset (offset defaults to `0`),\n\t * * parent element and `'end'` (sets position at the end of that element),\n\t * * {@link module:engine/model/item~Item model item} and `'before'` or `'after'` (sets position before or after given model item).\n\t *\n\t * This method is a shortcut to other factory methods such as:\n\t *\n\t * * {@link module:engine/model/position~Position._createBefore},\n\t * * {@link module:engine/model/position~Position._createAfter}.\n\t *\n\t * @param {module:engine/model/item~Item|module:engine/model/position~Position} itemOrPosition\n\t * @param {Number|'end'|'before'|'after'} [offset] Offset or one of the flags. Used only when the\n\t * first parameter is a {@link module:engine/model/item~Item model item}.\n\t * @param {module:engine/model/position~PositionStickiness} [stickiness='toNone'] Position stickiness. Used only when the\n\t * first parameter is a {@link module:engine/model/item~Item model item}.\n\t * @protected\n\t */\n\tstatic _createAt( itemOrPosition, offset, stickiness = 'toNone' ) {\n\t\tif ( itemOrPosition instanceof Position ) {\n\t\t\treturn new Position( itemOrPosition.root, itemOrPosition.path, itemOrPosition.stickiness );\n\t\t} else {\n\t\t\tconst node = itemOrPosition;\n\n\t\t\tif ( offset == 'end' ) {\n\t\t\t\toffset = node.maxOffset;\n\t\t\t} else if ( offset == 'before' ) {\n\t\t\t\treturn this._createBefore( node, stickiness );\n\t\t\t} else if ( offset == 'after' ) {\n\t\t\t\treturn this._createAfter( node, stickiness );\n\t\t\t} else if ( offset !== 0 && !offset ) {\n\t\t\t\t/**\n\t\t\t\t * {@link module:engine/model/model~Model#createPositionAt `Model#createPositionAt()`}\n\t\t\t\t * requires the offset to be specified when the first parameter is a model item.\n\t\t\t\t *\n\t\t\t\t * @error model-createpositionat-offset-required\n\t\t\t\t */\n\t\t\t\tthrow new CKEditorError( 'model-createpositionat-offset-required', [ this, itemOrPosition ] );\n\t\t\t}\n\n\t\t\tif ( !node.is( 'element' ) && !node.is( 'documentFragment' ) ) {\n\t\t\t\t/**\n\t\t\t\t * Position parent have to be a model element or model document fragment.\n\t\t\t\t *\n\t\t\t\t * @error model-position-parent-incorrect\n\t\t\t\t */\n\t\t\t\tthrow new CKEditorError(\n\t\t\t\t\t'model-position-parent-incorrect',\n\t\t\t\t\t[ this, itemOrPosition ]\n\t\t\t\t);\n\t\t\t}\n\n\t\t\tconst path = node.getPath();\n\n\t\t\tpath.push( offset );\n\n\t\t\treturn new this( node.root, path, stickiness );\n\t\t}\n\t}\n\n\t/**\n\t * Creates a new position, after given {@link module:engine/model/item~Item model item}.\n\t *\n\t * @param {module:engine/model/item~Item} item Item after which the position should be placed.\n\t * @param {module:engine/model/position~PositionStickiness} [stickiness='toNone'] Position stickiness.\n\t * @returns {module:engine/model/position~Position}\n\t * @protected\n\t */\n\tstatic _createAfter( item, stickiness ) {\n\t\tif ( !item.parent ) {\n\t\t\t/**\n\t\t\t * You can not make a position after a root element.\n\t\t\t *\n\t\t\t * @error model-position-after-root\n\t\t\t * @param {module:engine/model/item~Item} root\n\t\t\t */\n\t\t\tthrow new CKEditorError(\n\t\t\t\t'model-position-after-root',\n\t\t\t\t[ this, item ],\n\t\t\t\t{ root: item }\n\t\t\t);\n\t\t}\n\n\t\treturn this._createAt( item.parent, item.endOffset, stickiness );\n\t}\n\n\t/**\n\t * Creates a new position, before the given {@link module:engine/model/item~Item model item}.\n\t *\n\t * @param {module:engine/model/item~Item} item Item before which the position should be placed.\n\t * @param {module:engine/model/position~PositionStickiness} [stickiness='toNone'] Position stickiness.\n\t * @returns {module:engine/model/position~Position}\n\t * @protected\n\t */\n\tstatic _createBefore( item, stickiness ) {\n\t\tif ( !item.parent ) {\n\t\t\t/**\n\t\t\t * You can not make a position before a root element.\n\t\t\t *\n\t\t\t * @error model-position-before-root\n\t\t\t * @param {module:engine/model/item~Item} root\n\t\t\t */\n\t\t\tthrow new CKEditorError(\n\t\t\t\t'model-position-before-root',\n\t\t\t\titem,\n\t\t\t\t{ root: item }\n\t\t\t);\n\t\t}\n\n\t\treturn this._createAt( item.parent, item.startOffset, stickiness );\n\t}\n\n\t/**\n\t * Creates a `Position` instance from given plain object (i.e. parsed JSON string).\n\t *\n\t * @param {Object} json Plain object to be converted to `Position`.\n\t * @param {module:engine/model/document~Document} doc Document object that will be position owner.\n\t * @returns {module:engine/model/position~Position} `Position` instance created using given plain object.\n\t */\n\tstatic fromJSON( json, doc ) {\n\t\tif ( json.root === '$graveyard' ) {\n\t\t\tconst pos = new Position( doc.graveyard, json.path );\n\t\t\tpos.stickiness = json.stickiness;\n\n\t\t\treturn pos;\n\t\t}\n\n\t\tif ( !doc.getRoot( json.root ) ) {\n\t\t\t/**\n\t\t\t * Cannot create position for document. Root with specified name does not exist.\n\t\t\t *\n\t\t\t * @error model-position-fromjson-no-root\n\t\t\t * @param {String} rootName\n\t\t\t */\n\t\t\tthrow new CKEditorError(\n\t\t\t\t'model-position-fromjson-no-root',\n\t\t\t\tdoc,\n\t\t\t\t{ rootName: json.root }\n\t\t\t);\n\t\t}\n\n\t\treturn new Position( doc.getRoot( json.root ), json.path, json.stickiness );\n\t}\n\n\t// @if CK_DEBUG_ENGINE // toString() {\n\t// @if CK_DEBUG_ENGINE // \treturn `${ this.root } [ ${ this.path.join( ', ' ) } ]`;\n\t// @if CK_DEBUG_ENGINE // }\n\n\t// @if CK_DEBUG_ENGINE // log() {\n\t// @if CK_DEBUG_ENGINE // \tconsole.log( 'ModelPosition: ' + this );\n\t// @if CK_DEBUG_ENGINE // }\n}\n\n/**\n * A flag indicating whether this position is `'before'` or `'after'` or `'same'` as given position.\n * If positions are in different roots `'different'` flag is returned.\n *\n * @typedef {String} module:engine/model/position~PositionRelation\n */\n\n/**\n * Represents how position is \"sticking\" with neighbour nodes. Used to define how position should be transformed (moved)\n * in edge cases. Possible values: `'toNone'`, `'toNext'`, `'toPrevious'`.\n *\n * Examples:\n *\n *\t\tInsert. Position is at | and nodes are inserted at the same position, marked as ^:\n *\n *\t\t- sticks to none:           <p>f^|oo</p>  ->  <p>fbar|oo</p>\n *\t\t- sticks to next node:      <p>f^|oo</p>  ->  <p>fbar|oo</p>\n *\t\t- sticks to previous node:  <p>f|^oo</p>  ->  <p>f|baroo</p>\n *\n *\n *\t\tMove. Position is at | and range [oo] is moved to position ^:\n *\n *\t\t- sticks to none:           <p>f|[oo]</p><p>b^ar</p>  ->  <p>f|</p><p>booar</p>\n *\t\t- sticks to none:           <p>f[oo]|</p><p>b^ar</p>  ->  <p>f|</p><p>booar</p>\n *\n *\t\t- sticks to next node:      <p>f|[oo]</p><p>b^ar</p>  ->  <p>f</p><p>b|ooar</p>\n *\t\t- sticks to next node:      <p>f[oo]|</p><p>b^ar</p>  ->  <p>f|</p><p>booar</p>\n *\n *\t\t- sticks to previous node:  <p>f|[oo]</p><p>b^ar</p>  ->  <p>f|</p><p>booar</p>\n *\t\t- sticks to previous node:  <p>f[oo]|</p><p>b^ar</p>  ->  <p>f</p><p>boo|ar</p>\n *\n * @typedef {String} module:engine/model/position~PositionStickiness\n */\n\n/**\n * Returns a text node at the given position.\n *\n * This is a helper function optimized to reuse the position parent instance for performance reasons.\n *\n * Normally, you should use {@link module:engine/model/position~Position#textNode `Position#textNode`}.\n * If you start hitting performance issues with {@link module:engine/model/position~Position#parent `Position#parent`}\n * check if your algorithm does not access it multiple times (which can happen directly or indirectly via other position properties).\n *\n * See https://github.com/ckeditor/ckeditor5/issues/6579.\n *\n * See also:\n *\n * * {@link module:engine/model/position~getNodeAfterPosition}\n * * {@link module:engine/model/position~getNodeBeforePosition}\n *\n * @param {module:engine/model/position~Position} position\n * @param {module:engine/model/element~Element|module:engine/model/documentfragment~DocumentFragment} positionParent The parent of the\n * given position.\n * @returns {module:engine/model/text~Text|null}\n */\nexport function getTextNodeAtPosition( position, positionParent ) {\n\tconst node = positionParent.getChild( positionParent.offsetToIndex( position.offset ) );\n\n\tif ( node && node.is( '$text' ) && node.startOffset < position.offset ) {\n\t\treturn node;\n\t}\n\n\treturn null;\n}\n\n/**\n * Returns the node after the given position.\n *\n * This is a helper function optimized to reuse the position parent instance and the calculation of the text node at the\n * specific position for performance reasons.\n *\n * Normally, you should use {@link module:engine/model/position~Position#nodeAfter `Position#nodeAfter`}.\n * If you start hitting performance issues with {@link module:engine/model/position~Position#parent `Position#parent`} and/or\n * {@link module:engine/model/position~Position#textNode `Position#textNode`}\n * check if your algorithm does not access those properties multiple times\n * (which can happen directly or indirectly via other position properties).\n *\n * See https://github.com/ckeditor/ckeditor5/issues/6579 and https://github.com/ckeditor/ckeditor5/issues/6582.\n *\n * See also:\n *\n * * {@link module:engine/model/position~getTextNodeAtPosition}\n * * {@link module:engine/model/position~getNodeBeforePosition}\n *\n * @param {module:engine/model/position~Position} position\n * @param {module:engine/model/element~Element|module:engine/model/documentfragment~DocumentFragment} positionParent The parent of the\n * given position.\n * @param {module:engine/model/text~Text|null} textNode Text node at the given position.\n * @returns {module:engine/model/node~Node|null}\n */\nexport function getNodeAfterPosition( position, positionParent, textNode ) {\n\tif ( textNode !== null ) {\n\t\treturn null;\n\t}\n\n\treturn positionParent.getChild( positionParent.offsetToIndex( position.offset ) );\n}\n\n/**\n * Returns the node before the given position.\n *\n * Refer to {@link module:engine/model/position~getNodeBeforePosition} for documentation on when to use this util method.\n *\n * See also:\n *\n * * {@link module:engine/model/position~getTextNodeAtPosition}\n * * {@link module:engine/model/position~getNodeAfterPosition}\n *\n * @param {module:engine/model/position~Position} position\n * @param {module:engine/model/element~Element|module:engine/model/documentfragment~DocumentFragment} positionParent The parent of the\n * given position.\n * @param {module:engine/model/text~Text|null} textNode Text node at the given position.\n * @returns {module:engine/model/node~Node|null}\n */\nexport function getNodeBeforePosition( position, positionParent, textNode ) {\n\tif ( textNode !== null ) {\n\t\treturn null;\n\t}\n\n\treturn positionParent.getChild( positionParent.offsetToIndex( position.offset ) - 1 );\n}\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module engine/model/range\n */\n\nimport Position from './position';\nimport TreeWalker from './treewalker';\nimport CKEditorError from '@ckeditor/ckeditor5-utils/src/ckeditorerror';\nimport compareArrays from '@ckeditor/ckeditor5-utils/src/comparearrays';\n\n/**\n * Represents a range in the model tree.\n *\n * A range is defined by its {@link module:engine/model/range~Range#start} and {@link module:engine/model/range~Range#end}\n * positions.\n *\n * You can create range instances via its constructor or the `createRange*()` factory methods of\n * {@link module:engine/model/model~Model} and {@link module:engine/model/writer~Writer}.\n */\nexport default class Range {\n\t/**\n\t * Creates a range spanning from `start` position to `end` position.\n\t *\n\t * @param {module:engine/model/position~Position} start Start position.\n\t * @param {module:engine/model/position~Position} [end] End position. If not set, range will be collapsed at `start` position.\n\t */\n\tconstructor( start, end = null ) {\n\t\t/**\n\t\t * Start position.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:engine/model/position~Position}\n\t\t */\n\t\tthis.start = Position._createAt( start );\n\n\t\t/**\n\t\t * End position.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:engine/model/position~Position}\n\t\t */\n\t\tthis.end = end ? Position._createAt( end ) : Position._createAt( start );\n\n\t\t// If the range is collapsed, treat in a similar way as a position and set its boundaries stickiness to 'toNone'.\n\t\t// In other case, make the boundaries stick to the \"inside\" of the range.\n\t\tthis.start.stickiness = this.isCollapsed ? 'toNone' : 'toNext';\n\t\tthis.end.stickiness = this.isCollapsed ? 'toNone' : 'toPrevious';\n\t}\n\n\t/**\n\t * Iterable interface.\n\t *\n\t * Iterates over all {@link module:engine/model/item~Item items} that are in this range and returns\n\t * them together with additional information like length or {@link module:engine/model/position~Position positions},\n\t * grouped as {@link module:engine/model/treewalker~TreeWalkerValue}.\n\t * It iterates over all {@link module:engine/model/textproxy~TextProxy text contents} that are inside the range\n\t * and all the {@link module:engine/model/element~Element}s that are entered into when iterating over this range.\n\t *\n\t * This iterator uses {@link module:engine/model/treewalker~TreeWalker} with `boundaries` set to this range\n\t * and `ignoreElementEnd` option set to `true`.\n\t *\n\t * @returns {Iterable.<module:engine/model/treewalker~TreeWalkerValue>}\n\t */\n\t* [ Symbol.iterator ]() {\n\t\tyield* new TreeWalker( { boundaries: this, ignoreElementEnd: true } );\n\t}\n\n\t/**\n\t * Returns whether the range is collapsed, that is if {@link #start} and\n\t * {@link #end} positions are equal.\n\t *\n\t * @type {Boolean}\n\t */\n\tget isCollapsed() {\n\t\treturn this.start.isEqual( this.end );\n\t}\n\n\t/**\n\t * Returns whether this range is flat, that is if {@link #start} position and\n\t * {@link #end} position are in the same {@link module:engine/model/position~Position#parent}.\n\t *\n\t * @type {Boolean}\n\t */\n\tget isFlat() {\n\t\tconst startParentPath = this.start.getParentPath();\n\t\tconst endParentPath = this.end.getParentPath();\n\n\t\treturn compareArrays( startParentPath, endParentPath ) == 'same';\n\t}\n\n\t/**\n\t * Range root element.\n\t *\n\t * @type {module:engine/model/element~Element|module:engine/model/documentfragment~DocumentFragment}\n\t */\n\tget root() {\n\t\treturn this.start.root;\n\t}\n\n\t/**\n\t * Checks whether this range contains given {@link module:engine/model/position~Position position}.\n\t *\n\t * @param {module:engine/model/position~Position} position Position to check.\n\t * @returns {Boolean} `true` if given {@link module:engine/model/position~Position position} is contained\n\t * in this range,`false` otherwise.\n\t */\n\tcontainsPosition( position ) {\n\t\treturn position.isAfter( this.start ) && position.isBefore( this.end );\n\t}\n\n\t/**\n\t * Checks whether this range contains given {@link ~Range range}.\n\t *\n\t * @param {module:engine/model/range~Range} otherRange Range to check.\n\t * @param {Boolean} [loose=false] Whether the check is loose or strict. If the check is strict (`false`), compared range cannot\n\t * start or end at the same position as this range boundaries. If the check is loose (`true`), compared range can start, end or\n\t * even be equal to this range. Note that collapsed ranges are always compared in strict mode.\n\t * @returns {Boolean} `true` if given {@link ~Range range} boundaries are contained by this range, `false` otherwise.\n\t */\n\tcontainsRange( otherRange, loose = false ) {\n\t\tif ( otherRange.isCollapsed ) {\n\t\t\tloose = false;\n\t\t}\n\n\t\tconst containsStart = this.containsPosition( otherRange.start ) || ( loose && this.start.isEqual( otherRange.start ) );\n\t\tconst containsEnd = this.containsPosition( otherRange.end ) || ( loose && this.end.isEqual( otherRange.end ) );\n\n\t\treturn containsStart && containsEnd;\n\t}\n\n\t/**\n\t * Checks whether given {@link module:engine/model/item~Item} is inside this range.\n\t *\n\t * @param {module:engine/model/item~Item} item Model item to check.\n\t */\n\tcontainsItem( item ) {\n\t\tconst pos = Position._createBefore( item );\n\n\t\treturn this.containsPosition( pos ) || this.start.isEqual( pos );\n\t}\n\n\t/**\n\t * Checks whether this object is of the given.\n\t *\n\t *\t\trange.is( 'range' ); // -> true\n\t *\t\trange.is( 'model:range' ); // -> true\n\t *\n\t *\t\trange.is( 'view:range' ); // -> false\n\t *\t\trange.is( 'documentSelection' ); // -> false\n\t *\n\t * {@link module:engine/model/node~Node#is Check the entire list of model objects} which implement the `is()` method.\n\t *\n\t * @param {String} type\n\t * @returns {Boolean}\n\t */\n\tis( type ) {\n\t\treturn type === 'range' || type === 'model:range';\n\t}\n\n\t/**\n\t * Two ranges are equal if their {@link #start} and {@link #end} positions are equal.\n\t *\n\t * @param {module:engine/model/range~Range} otherRange Range to compare with.\n\t * @returns {Boolean} `true` if ranges are equal, `false` otherwise.\n\t */\n\tisEqual( otherRange ) {\n\t\treturn this.start.isEqual( otherRange.start ) && this.end.isEqual( otherRange.end );\n\t}\n\n\t/**\n\t * Checks and returns whether this range intersects with given range.\n\t *\n\t * @param {module:engine/model/range~Range} otherRange Range to compare with.\n\t * @returns {Boolean} `true` if ranges intersect, `false` otherwise.\n\t */\n\tisIntersecting( otherRange ) {\n\t\treturn this.start.isBefore( otherRange.end ) && this.end.isAfter( otherRange.start );\n\t}\n\n\t/**\n\t * Computes which part(s) of this {@link ~Range range} is not a part of given {@link ~Range range}.\n\t * Returned array contains zero, one or two {@link ~Range ranges}.\n\t *\n\t * Examples:\n\t *\n\t *\t\tlet range = model.createRange(\n\t *\t\t\tmodel.createPositionFromPath( root, [ 2, 7 ] ),\n\t *\t\t\tmodel.createPositionFromPath( root, [ 4, 0, 1 ] )\n\t *\t\t);\n\t *\t\tlet otherRange = model.createRange( model.createPositionFromPath( root, [ 1 ] ), model.createPositionFromPath( root, [ 5 ] ) );\n\t *\t\tlet transformed = range.getDifference( otherRange );\n\t *\t\t// transformed array has no ranges because `otherRange` contains `range`\n\t *\n\t *\t\totherRange = model.createRange( model.createPositionFromPath( root, [ 1 ] ), model.createPositionFromPath( root, [ 3 ] ) );\n\t *\t\ttransformed = range.getDifference( otherRange );\n\t *\t\t// transformed array has one range: from [ 3 ] to [ 4, 0, 1 ]\n\t *\n\t *\t\totherRange = model.createRange( model.createPositionFromPath( root, [ 3 ] ), model.createPositionFromPath( root, [ 4 ] ) );\n\t *\t\ttransformed = range.getDifference( otherRange );\n\t *\t\t// transformed array has two ranges: from [ 2, 7 ] to [ 3 ] and from [ 4 ] to [ 4, 0, 1 ]\n\t *\n\t * @param {module:engine/model/range~Range} otherRange Range to differentiate against.\n\t * @returns {Array.<module:engine/model/range~Range>} The difference between ranges.\n\t */\n\tgetDifference( otherRange ) {\n\t\tconst ranges = [];\n\n\t\tif ( this.isIntersecting( otherRange ) ) {\n\t\t\t// Ranges intersect.\n\n\t\t\tif ( this.containsPosition( otherRange.start ) ) {\n\t\t\t\t// Given range start is inside this range. This means that we have to\n\t\t\t\t// add shrunken range - from the start to the middle of this range.\n\t\t\t\tranges.push( new Range( this.start, otherRange.start ) );\n\t\t\t}\n\n\t\t\tif ( this.containsPosition( otherRange.end ) ) {\n\t\t\t\t// Given range end is inside this range. This means that we have to\n\t\t\t\t// add shrunken range - from the middle of this range to the end.\n\t\t\t\tranges.push( new Range( otherRange.end, this.end ) );\n\t\t\t}\n\t\t} else {\n\t\t\t// Ranges do not intersect, return the original range.\n\t\t\tranges.push( new Range( this.start, this.end ) );\n\t\t}\n\n\t\treturn ranges;\n\t}\n\n\t/**\n\t * Returns an intersection of this {@link ~Range range} and given {@link ~Range range}.\n\t * Intersection is a common part of both of those ranges. If ranges has no common part, returns `null`.\n\t *\n\t * Examples:\n\t *\n\t *\t\tlet range = model.createRange(\n\t *\t\t\tmodel.createPositionFromPath( root, [ 2, 7 ] ),\n\t *\t\t\tmodel.createPositionFromPath( root, [ 4, 0, 1 ] )\n\t *\t\t);\n\t *\t\tlet otherRange = model.createRange( model.createPositionFromPath( root, [ 1 ] ), model.createPositionFromPath( root, [ 2 ] ) );\n\t *\t\tlet transformed = range.getIntersection( otherRange ); // null - ranges have no common part\n\t *\n\t *\t\totherRange = model.createRange( model.createPositionFromPath( root, [ 3 ] ), model.createPositionFromPath( root, [ 5 ] ) );\n\t *\t\ttransformed = range.getIntersection( otherRange ); // range from [ 3 ] to [ 4, 0, 1 ]\n\t *\n\t * @param {module:engine/model/range~Range} otherRange Range to check for intersection.\n\t * @returns {module:engine/model/range~Range|null} A common part of given ranges or `null` if ranges have no common part.\n\t */\n\tgetIntersection( otherRange ) {\n\t\tif ( this.isIntersecting( otherRange ) ) {\n\t\t\t// Ranges intersect, so a common range will be returned.\n\t\t\t// At most, it will be same as this range.\n\t\t\tlet commonRangeStart = this.start;\n\t\t\tlet commonRangeEnd = this.end;\n\n\t\t\tif ( this.containsPosition( otherRange.start ) ) {\n\t\t\t\t// Given range start is inside this range. This means thaNt we have to\n\t\t\t\t// shrink common range to the given range start.\n\t\t\t\tcommonRangeStart = otherRange.start;\n\t\t\t}\n\n\t\t\tif ( this.containsPosition( otherRange.end ) ) {\n\t\t\t\t// Given range end is inside this range. This means that we have to\n\t\t\t\t// shrink common range to the given range end.\n\t\t\t\tcommonRangeEnd = otherRange.end;\n\t\t\t}\n\n\t\t\treturn new Range( commonRangeStart, commonRangeEnd );\n\t\t}\n\n\t\t// Ranges do not intersect, so they do not have common part.\n\t\treturn null;\n\t}\n\n\t/**\n\t * Returns a range created by joining this {@link ~Range range} with the given {@link ~Range range}.\n\t * If ranges have no common part, returns `null`.\n\t *\n\t * Examples:\n\t *\n\t *\t\tlet range = model.createRange(\n\t *\t\t\tmodel.createPositionFromPath( root, [ 2, 7 ] ),\n\t *\t\t\tmodel.createPositionFromPath( root, [ 4, 0, 1 ] )\n\t *\t\t);\n\t *\t\tlet otherRange = model.createRange(\n\t *\t\t\tmodel.createPositionFromPath( root, [ 1 ] ),\n\t *\t\t\tmodel.createPositionFromPath( root, [ 2 ] )\n \t *\t\t);\n\t *\t\tlet transformed = range.getJoined( otherRange ); // null - ranges have no common part\n\t *\n\t *\t\totherRange = model.createRange(\n\t *\t\t\tmodel.createPositionFromPath( root, [ 3 ] ),\n\t *\t\t\tmodel.createPositionFromPath( root, [ 5 ] )\n\t *\t\t);\n\t *\t\ttransformed = range.getJoined( otherRange ); // range from [ 2, 7 ] to [ 5 ]\n\t *\n\t * @param {module:engine/model/range~Range} otherRange Range to be joined.\n\t * @param {Boolean} [loose=false] Whether the intersection check is loose or strict. If the check is strict (`false`),\n\t * ranges are tested for intersection or whether start/end positions are equal. If the check is loose (`true`),\n\t * compared range is also checked if it's {@link module:engine/model/position~Position#isTouching touching} current range.\n\t * @returns {module:engine/model/range~Range|null} A sum of given ranges or `null` if ranges have no common part.\n\t */\n\tgetJoined( otherRange, loose = false ) {\n\t\tlet shouldJoin = this.isIntersecting( otherRange );\n\n\t\tif ( !shouldJoin ) {\n\t\t\tif ( this.start.isBefore( otherRange.start ) ) {\n\t\t\t\tshouldJoin = loose ? this.end.isTouching( otherRange.start ) : this.end.isEqual( otherRange.start );\n\t\t\t} else {\n\t\t\t\tshouldJoin = loose ? otherRange.end.isTouching( this.start ) : otherRange.end.isEqual( this.start );\n\t\t\t}\n\t\t}\n\n\t\tif ( !shouldJoin ) {\n\t\t\treturn null;\n\t\t}\n\n\t\tlet startPosition = this.start;\n\t\tlet endPosition = this.end;\n\n\t\tif ( otherRange.start.isBefore( startPosition ) ) {\n\t\t\tstartPosition = otherRange.start;\n\t\t}\n\n\t\tif ( otherRange.end.isAfter( endPosition ) ) {\n\t\t\tendPosition = otherRange.end;\n\t\t}\n\n\t\treturn new Range( startPosition, endPosition );\n\t}\n\n\t/**\n\t * Computes and returns the smallest set of {@link #isFlat flat} ranges, that covers this range in whole.\n\t *\n\t * See an example of a model structure (`[` and `]` are range boundaries):\n\t *\n\t *\t\troot                                                            root\n\t *\t\t |- element DIV                         DIV             P2              P3             DIV\n\t *\t\t |   |- element H                   H        P1        f o o           b a r       H         P4\n\t *\t\t |   |   |- \"fir[st\"             fir[st     lorem                               se]cond     ipsum\n\t *\t\t |   |- element P1\n\t *\t\t |   |   |- \"lorem\"                                              ||\n\t *\t\t |- element P2                                                   ||\n\t *\t\t |   |- \"foo\"                                                    VV\n\t *\t\t |- element P3\n\t *\t\t |   |- \"bar\"                                                   root\n\t *\t\t |- element DIV                         DIV             [P2             P3]             DIV\n\t *\t\t |   |- element H                   H       [P1]       f o o           b a r        H         P4\n\t *\t\t |   |   |- \"se]cond\"            fir[st]    lorem                               [se]cond     ipsum\n\t *\t\t |   |- element P4\n\t *\t\t |   |   |- \"ipsum\"\n\t *\n\t * As it can be seen, letters contained in the range are: `stloremfoobarse`, spread across different parents.\n\t * We are looking for minimal set of flat ranges that contains the same nodes.\n\t *\n\t * Minimal flat ranges for above range `( [ 0, 0, 3 ], [ 3, 0, 2 ] )` will be:\n\t *\n\t *\t\t( [ 0, 0, 3 ], [ 0, 0, 5 ] ) = \"st\"\n\t *\t\t( [ 0, 1 ], [ 0, 2 ] ) = element P1 (\"lorem\")\n\t *\t\t( [ 1 ], [ 3 ] ) = element P2, element P3 (\"foobar\")\n\t *\t\t( [ 3, 0, 0 ], [ 3, 0, 2 ] ) = \"se\"\n\t *\n\t * **Note:** if an {@link module:engine/model/element~Element element} is not wholly contained in this range, it won't be returned\n\t * in any of the returned flat ranges. See in the example how `H` elements at the beginning and at the end of the range\n\t * were omitted. Only their parts that were wholly in the range were returned.\n\t *\n\t * **Note:** this method is not returning flat ranges that contain no nodes.\n\t *\n\t * @returns {Array.<module:engine/model/range~Range>} Array of flat ranges covering this range.\n\t */\n\tgetMinimalFlatRanges() {\n\t\tconst ranges = [];\n\t\tconst diffAt = this.start.getCommonPath( this.end ).length;\n\n\t\tconst pos = Position._createAt( this.start );\n\t\tlet posParent = pos.parent;\n\n\t\t// Go up.\n\t\twhile ( pos.path.length > diffAt + 1 ) {\n\t\t\tconst howMany = posParent.maxOffset - pos.offset;\n\n\t\t\tif ( howMany !== 0 ) {\n\t\t\t\tranges.push( new Range( pos, pos.getShiftedBy( howMany ) ) );\n\t\t\t}\n\n\t\t\tpos.path = pos.path.slice( 0, -1 );\n\t\t\tpos.offset++;\n\t\t\tposParent = posParent.parent;\n\t\t}\n\n\t\t// Go down.\n\t\twhile ( pos.path.length <= this.end.path.length ) {\n\t\t\tconst offset = this.end.path[ pos.path.length - 1 ];\n\t\t\tconst howMany = offset - pos.offset;\n\n\t\t\tif ( howMany !== 0 ) {\n\t\t\t\tranges.push( new Range( pos, pos.getShiftedBy( howMany ) ) );\n\t\t\t}\n\n\t\t\tpos.offset = offset;\n\t\t\tpos.path.push( 0 );\n\t\t}\n\n\t\treturn ranges;\n\t}\n\n\t/**\n\t * Creates a {@link module:engine/model/treewalker~TreeWalker TreeWalker} instance with this range as a boundary.\n\t *\n\t * For example, to iterate over all items in the entire document root:\n\t *\n\t *\t\t// Create a range spanning over the entire root content:\n\t *\t\tconst range = editor.model.createRangeIn( editor.model.document.getRoot() );\n\t *\n\t *\t\t// Iterate over all items in this range:\n\t *\t\tfor ( const value of range.getWalker() ) {\n\t *\t\t\tconsole.log( value.item );\n\t *\t\t}\n\t *\n\t * @param {Object} options Object with configuration options. See {@link module:engine/model/treewalker~TreeWalker}.\n\t * @param {module:engine/model/position~Position} [options.startPosition]\n\t * @param {Boolean} [options.singleCharacters=false]\n\t * @param {Boolean} [options.shallow=false]\n\t * @param {Boolean} [options.ignoreElementEnd=false]\n\t */\n\tgetWalker( options = {} ) {\n\t\toptions.boundaries = this;\n\n\t\treturn new TreeWalker( options );\n\t}\n\n\t/**\n\t * Returns an iterator that iterates over all {@link module:engine/model/item~Item items} that are in this range and returns\n\t * them.\n\t *\n\t * This method uses {@link module:engine/model/treewalker~TreeWalker} with `boundaries` set to this range and `ignoreElementEnd` option\n\t * set to `true`. However it returns only {@link module:engine/model/item~Item model items},\n\t * not {@link module:engine/model/treewalker~TreeWalkerValue}.\n\t *\n\t * You may specify additional options for the tree walker. See {@link module:engine/model/treewalker~TreeWalker} for\n\t * a full list of available options.\n\t *\n\t * @param {Object} options Object with configuration options. See {@link module:engine/model/treewalker~TreeWalker}.\n\t * @returns {Iterable.<module:engine/model/item~Item>}\n\t */\n\t* getItems( options = {} ) {\n\t\toptions.boundaries = this;\n\t\toptions.ignoreElementEnd = true;\n\n\t\tconst treeWalker = new TreeWalker( options );\n\n\t\tfor ( const value of treeWalker ) {\n\t\t\tyield value.item;\n\t\t}\n\t}\n\n\t/**\n\t * Returns an iterator that iterates over all {@link module:engine/model/position~Position positions} that are boundaries or\n\t * contained in this range.\n\t *\n\t * This method uses {@link module:engine/model/treewalker~TreeWalker} with `boundaries` set to this range. However it returns only\n\t * {@link module:engine/model/position~Position positions}, not {@link module:engine/model/treewalker~TreeWalkerValue}.\n\t *\n\t * You may specify additional options for the tree walker. See {@link module:engine/model/treewalker~TreeWalker} for\n\t * a full list of available options.\n\t *\n\t * @param {Object} options Object with configuration options. See {@link module:engine/model/treewalker~TreeWalker}.\n\t * @returns {Iterable.<module:engine/model/position~Position>}\n\t */\n\t* getPositions( options = {} ) {\n\t\toptions.boundaries = this;\n\n\t\tconst treeWalker = new TreeWalker( options );\n\n\t\tyield treeWalker.position;\n\n\t\tfor ( const value of treeWalker ) {\n\t\t\tyield value.nextPosition;\n\t\t}\n\t}\n\n\t/**\n\t * Returns a range that is a result of transforming this range by given `operation`.\n\t *\n\t * **Note:** transformation may break one range into multiple ranges (for example, when a part of the range is\n\t * moved to a different part of document tree). For this reason, an array is returned by this method and it\n\t * may contain one or more `Range` instances.\n\t *\n\t * @param {module:engine/model/operation/operation~Operation} operation Operation to transform range by.\n\t * @returns {Array.<module:engine/model/range~Range>} Range which is the result of transformation.\n\t */\n\tgetTransformedByOperation( operation ) {\n\t\tswitch ( operation.type ) {\n\t\t\tcase 'insert':\n\t\t\t\treturn this._getTransformedByInsertOperation( operation );\n\t\t\tcase 'move':\n\t\t\tcase 'remove':\n\t\t\tcase 'reinsert':\n\t\t\t\treturn this._getTransformedByMoveOperation( operation );\n\t\t\tcase 'split':\n\t\t\t\treturn [ this._getTransformedBySplitOperation( operation ) ];\n\t\t\tcase 'merge':\n\t\t\t\treturn [ this._getTransformedByMergeOperation( operation ) ];\n\t\t}\n\n\t\treturn [ new Range( this.start, this.end ) ];\n\t}\n\n\t/**\n\t * Returns a range that is a result of transforming this range by multiple `operations`.\n\t *\n\t * @see ~Range#getTransformedByOperation\n\t * @param {Iterable.<module:engine/model/operation/operation~Operation>} operations Operations to transform the range by.\n\t * @returns {Array.<module:engine/model/range~Range>} Range which is the result of transformation.\n\t */\n\tgetTransformedByOperations( operations ) {\n\t\tconst ranges = [ new Range( this.start, this.end ) ];\n\n\t\tfor ( const operation of operations ) {\n\t\t\tfor ( let i = 0; i < ranges.length; i++ ) {\n\t\t\t\tconst result = ranges[ i ].getTransformedByOperation( operation );\n\n\t\t\t\tranges.splice( i, 1, ...result );\n\t\t\t\ti += result.length - 1;\n\t\t\t}\n\t\t}\n\n\t\t// It may happen that a range is split into two, and then the part of second \"piece\" is moved into first\n\t\t// \"piece\". In this case we will have incorrect third range, which should not be included in the result --\n\t\t// because it is already included in the first \"piece\". In this loop we are looking for all such ranges that\n\t\t// are inside other ranges and we simply remove them.\n\t\tfor ( let i = 0; i < ranges.length; i++ ) {\n\t\t\tconst range = ranges[ i ];\n\n\t\t\tfor ( let j = i + 1; j < ranges.length; j++ ) {\n\t\t\t\tconst next = ranges[ j ];\n\n\t\t\t\tif ( range.containsRange( next ) || next.containsRange( range ) || range.isEqual( next ) ) {\n\t\t\t\t\tranges.splice( j, 1 );\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\n\t\treturn ranges;\n\t}\n\n\t/**\n\t * Returns an {@link module:engine/model/element~Element} or {@link module:engine/model/documentfragment~DocumentFragment}\n\t * which is a common ancestor of the range's both ends (in which the entire range is contained).\n\t *\n\t * @returns {module:engine/model/element~Element|module:engine/model/documentfragment~DocumentFragment|null}\n\t */\n\tgetCommonAncestor() {\n\t\treturn this.start.getCommonAncestor( this.end );\n\t}\n\n\t/**\n\t * Returns an {@link module:engine/model/element~Element Element} contained by the range.\n\t * The element will be returned when it is the **only** node within the range and **fully–contained**\n\t * at the same time.\n\t *\n\t * @returns {module:engine/model/element~Element|null}\n\t */\n\tgetContainedElement() {\n\t\tif ( this.isCollapsed ) {\n\t\t\treturn null;\n\t\t}\n\n\t\tconst nodeAfterStart = this.start.nodeAfter;\n\t\tconst nodeBeforeEnd = this.end.nodeBefore;\n\n\t\tif ( nodeAfterStart && nodeAfterStart.is( 'element' ) && nodeAfterStart === nodeBeforeEnd ) {\n\t\t\treturn nodeAfterStart;\n\t\t}\n\n\t\treturn null;\n\t}\n\n\t/**\n\t * Converts `Range` to plain object and returns it.\n\t *\n\t * @returns {Object} `Node` converted to plain object.\n\t */\n\ttoJSON() {\n\t\treturn {\n\t\t\tstart: this.start.toJSON(),\n\t\t\tend: this.end.toJSON()\n\t\t};\n\t}\n\n\t/**\n\t * Returns a new range that is equal to current range.\n\t *\n\t * @returns {module:engine/model/range~Range}\n\t */\n\tclone() {\n\t\treturn new this.constructor( this.start, this.end );\n\t}\n\n\t/**\n\t * Returns a result of transforming a copy of this range by insert operation.\n\t *\n\t * One or more ranges may be returned as a result of this transformation.\n\t *\n\t * @protected\n\t * @param {module:engine/model/operation/insertoperation~InsertOperation} operation\n\t * @returns {Array.<module:engine/model/range~Range>}\n\t */\n\t_getTransformedByInsertOperation( operation, spread = false ) {\n\t\treturn this._getTransformedByInsertion( operation.position, operation.howMany, spread );\n\t}\n\n\t/**\n\t * Returns a result of transforming a copy of this range by move operation.\n\t *\n\t * One or more ranges may be returned as a result of this transformation.\n\t *\n\t * @protected\n\t * @param {module:engine/model/operation/moveoperation~MoveOperation} operation\n\t * @returns {Array.<module:engine/model/range~Range>}\n\t */\n\t_getTransformedByMoveOperation( operation, spread = false ) {\n\t\tconst sourcePosition = operation.sourcePosition;\n\t\tconst howMany = operation.howMany;\n\t\tconst targetPosition = operation.targetPosition;\n\n\t\treturn this._getTransformedByMove( sourcePosition, targetPosition, howMany, spread );\n\t}\n\n\t/**\n\t * Returns a result of transforming a copy of this range by split operation.\n\t *\n\t * Always one range is returned. The transformation is done in a way to not break the range.\n\t *\n\t * @protected\n\t * @param {module:engine/model/operation/splitoperation~SplitOperation} operation\n\t * @returns {module:engine/model/range~Range}\n\t */\n\t_getTransformedBySplitOperation( operation ) {\n\t\tconst start = this.start._getTransformedBySplitOperation( operation );\n\t\tlet end = this.end._getTransformedBySplitOperation( operation );\n\n\t\tif ( this.end.isEqual( operation.insertionPosition ) ) {\n\t\t\tend = this.end.getShiftedBy( 1 );\n\t\t}\n\n\t\t// Below may happen when range contains graveyard element used by split operation.\n\t\tif ( start.root != end.root ) {\n\t\t\t// End position was next to the moved graveyard element and was moved with it.\n\t\t\t// Fix it by using old `end` which has proper `root`.\n\t\t\tend = this.end.getShiftedBy( -1 );\n\t\t}\n\n\t\treturn new Range( start, end );\n\t}\n\n\t/**\n\t * Returns a result of transforming a copy of this range by merge operation.\n\t *\n\t * Always one range is returned. The transformation is done in a way to not break the range.\n\t *\n\t * @protected\n\t * @param {module:engine/model/operation/mergeoperation~MergeOperation} operation\n\t * @returns {module:engine/model/range~Range}\n\t */\n\t_getTransformedByMergeOperation( operation ) {\n\t\t// Special case when the marker is set on \"the closing tag\" of an element. Marker can be set like that during\n\t\t// transformations, especially when a content of a few block elements were removed. For example:\n\t\t//\n\t\t// {} is the transformed range, [] is the removed range.\n\t\t// <p>F[o{o</p><p>B}ar</p><p>Xy]z</p>\n\t\t//\n\t\t// <p>Fo{o</p><p>B}ar</p><p>z</p>\n\t\t// <p>F{</p><p>B}ar</p><p>z</p>\n\t\t// <p>F{</p>}<p>z</p>\n\t\t// <p>F{}z</p>\n\t\t//\n\t\tif ( this.start.isEqual( operation.targetPosition ) && this.end.isEqual( operation.deletionPosition ) ) {\n\t\t\treturn new Range( this.start );\n\t\t}\n\n\t\tlet start = this.start._getTransformedByMergeOperation( operation );\n\t\tlet end = this.end._getTransformedByMergeOperation( operation );\n\n\t\tif ( start.root != end.root ) {\n\t\t\t// This happens when the end position was next to the merged (deleted) element.\n\t\t\t// Then, the end position was moved to the graveyard root. In this case we need to fix\n\t\t\t// the range cause its boundaries would be in different roots.\n\t\t\tend = this.end.getShiftedBy( -1 );\n\t\t}\n\n\t\tif ( start.isAfter( end ) ) {\n\t\t\t// This happens in three following cases:\n\t\t\t//\n\t\t\t// Case 1: Merge operation source position is before the target position (due to some transformations, OT, etc.)\n\t\t\t//         This means that start can be moved before the end of the range.\n\t\t\t//\n\t\t\t// Before: <p>a{a</p><p>b}b</p><p>cc</p>\n\t\t\t// Merge:  <p>b}b</p><p>cca{a</p>\n\t\t\t// Fix:    <p>{b}b</p><p>ccaa</p>\n\t\t\t//\n\t\t\t// Case 2: Range start is before merged node but not directly.\n\t\t\t//         Result should include all nodes that were in the original range.\n\t\t\t//\n\t\t\t// Before: <p>aa</p>{<p>cc</p><p>b}b</p>\n\t\t\t// Merge:  <p>aab}b</p>{<p>cc</p>\n\t\t\t// Fix:    <p>aa{bb</p><p>cc</p>}\n\t\t\t//\n\t\t\t//         The range is expanded by an additional `b` letter but it is better than dropping the whole `cc` paragraph.\n\t\t\t//\n\t\t\t// Case 3: Range start is directly before merged node.\n\t\t\t//         Resulting range should include only nodes from the merged element:\n\t\t\t//\n\t\t\t// Before: <p>aa</p>{<p>b}b</p><p>cc</p>\n\t\t\t// Merge:  <p>aab}b</p>{<p>cc</p>\n\t\t\t// Fix:    <p>aa{b}b</p><p>cc</p>\n\t\t\t//\n\n\t\t\tif ( operation.sourcePosition.isBefore( operation.targetPosition ) ) {\n\t\t\t\t// Case 1.\n\t\t\t\tstart = Position._createAt( end );\n\t\t\t\tstart.offset = 0;\n\t\t\t} else {\n\t\t\t\tif ( !operation.deletionPosition.isEqual( start ) ) {\n\t\t\t\t\t// Case 2.\n\t\t\t\t\tend = operation.deletionPosition;\n\t\t\t\t}\n\n\t\t\t\t// In both case 2 and 3 start is at the end of the merge-to element.\n\t\t\t\tstart = operation.targetPosition;\n\t\t\t}\n\n\t\t\treturn new Range( start, end );\n\t\t}\n\n\t\treturn new Range( start, end );\n\t}\n\n\t/**\n\t * Returns an array containing one or two {@link ~Range ranges} that are a result of transforming this\n\t * {@link ~Range range} by inserting `howMany` nodes at `insertPosition`. Two {@link ~Range ranges} are\n\t * returned if the insertion was inside this {@link ~Range range} and `spread` is set to `true`.\n\t *\n\t * Examples:\n\t *\n\t *\t\tlet range = model.createRange(\n\t *\t\t\tmodel.createPositionFromPath( root, [ 2, 7 ] ),\n\t *\t\t\tmodel.createPositionFromPath( root, [ 4, 0, 1 ] )\n\t *\t\t);\n\t *\t\tlet transformed = range._getTransformedByInsertion( model.createPositionFromPath( root, [ 1 ] ), 2 );\n\t *\t\t// transformed array has one range from [ 4, 7 ] to [ 6, 0, 1 ]\n\t *\n\t *\t\ttransformed = range._getTransformedByInsertion( model.createPositionFromPath( root, [ 4, 0, 0 ] ), 4 );\n\t *\t\t// transformed array has one range from [ 2, 7 ] to [ 4, 0, 5 ]\n\t *\n\t *\t\ttransformed = range._getTransformedByInsertion( model.createPositionFromPath( root, [ 3, 2 ] ), 4 );\n\t *\t\t// transformed array has one range, which is equal to original range\n\t *\n\t *\t\ttransformed = range._getTransformedByInsertion( model.createPositionFromPath( root, [ 3, 2 ] ), 4, true );\n\t *\t\t// transformed array has two ranges: from [ 2, 7 ] to [ 3, 2 ] and from [ 3, 6 ] to [ 4, 0, 1 ]\n\t *\n\t * @protected\n\t * @param {module:engine/model/position~Position} insertPosition Position where nodes are inserted.\n\t * @param {Number} howMany How many nodes are inserted.\n\t * @param {Boolean} [spread] Flag indicating whether this {~Range range} should be spread if insertion\n\t * was inside the range. Defaults to `false`.\n\t * @returns {Array.<module:engine/model/range~Range>} Result of the transformation.\n\t */\n\t_getTransformedByInsertion( insertPosition, howMany, spread = false ) {\n\t\tif ( spread && this.containsPosition( insertPosition ) ) {\n\t\t\t// Range has to be spread. The first part is from original start to the spread point.\n\t\t\t// The other part is from spread point to the original end, but transformed by\n\t\t\t// insertion to reflect insertion changes.\n\n\t\t\treturn [\n\t\t\t\tnew Range( this.start, insertPosition ),\n\t\t\t\tnew Range(\n\t\t\t\t\tinsertPosition.getShiftedBy( howMany ),\n\t\t\t\t\tthis.end._getTransformedByInsertion( insertPosition, howMany )\n\t\t\t\t)\n\t\t\t];\n\t\t} else {\n\t\t\tconst range = new Range( this.start, this.end );\n\n\t\t\trange.start = range.start._getTransformedByInsertion( insertPosition, howMany );\n\t\t\trange.end = range.end._getTransformedByInsertion( insertPosition, howMany );\n\n\t\t\treturn [ range ];\n\t\t}\n\t}\n\n\t/**\n\t * Returns an array containing {@link ~Range ranges} that are a result of transforming this\n\t * {@link ~Range range} by moving `howMany` nodes from `sourcePosition` to `targetPosition`.\n\t *\n\t * @protected\n\t * @param {module:engine/model/position~Position} sourcePosition Position from which nodes are moved.\n\t * @param {module:engine/model/position~Position} targetPosition Position to where nodes are moved.\n\t * @param {Number} howMany How many nodes are moved.\n\t * @param {Boolean} [spread=false] Whether the range should be spread if the move points inside the range.\n\t * @returns {Array.<module:engine/model/range~Range>} Result of the transformation.\n\t */\n\t_getTransformedByMove( sourcePosition, targetPosition, howMany, spread = false ) {\n\t\t// Special case for transforming a collapsed range. Just transform it like a position.\n\t\tif ( this.isCollapsed ) {\n\t\t\tconst newPos = this.start._getTransformedByMove( sourcePosition, targetPosition, howMany );\n\n\t\t\treturn [ new Range( newPos ) ];\n\t\t}\n\n\t\t// Special case for transformation when a part of the range is moved towards the range.\n\t\t//\n\t\t// Examples:\n\t\t//\n\t\t// <div><p>ab</p><p>c[d</p></div><p>e]f</p> --> <div><p>ab</p></div><p>c[d</p><p>e]f</p>\n\t\t// <p>e[f</p><div><p>a]b</p><p>cd</p></div> --> <p>e[f</p><p>a]b</p><div><p>cd</p></div>\n\t\t//\n\t\t// Without this special condition, the default algorithm leaves an \"artifact\" range from one of `differenceSet` parts:\n\t\t//\n\t\t// <div><p>ab</p><p>c[d</p></div><p>e]f</p> --> <div><p>ab</p>{</div>}<p>c[d</p><p>e]f</p>\n\t\t//\n\t\t// This special case is applied only if the range is to be kept together (not spread).\n\t\tconst moveRange = Range._createFromPositionAndShift( sourcePosition, howMany );\n\t\tconst insertPosition = targetPosition._getTransformedByDeletion( sourcePosition, howMany );\n\n\t\tif ( this.containsPosition( targetPosition ) && !spread ) {\n\t\t\tif ( moveRange.containsPosition( this.start ) || moveRange.containsPosition( this.end ) ) {\n\t\t\t\tconst start = this.start._getTransformedByMove( sourcePosition, targetPosition, howMany );\n\t\t\t\tconst end = this.end._getTransformedByMove( sourcePosition, targetPosition, howMany );\n\n\t\t\t\treturn [ new Range( start, end ) ];\n\t\t\t}\n\t\t}\n\n\t\t// Default algorithm.\n\t\tlet result;\n\n\t\tconst differenceSet = this.getDifference( moveRange );\n\t\tlet difference = null;\n\n\t\tconst common = this.getIntersection( moveRange );\n\n\t\tif ( differenceSet.length == 1 ) {\n\t\t\t// `moveRange` and this range may intersect but may be separate.\n\t\t\tdifference = new Range(\n\t\t\t\tdifferenceSet[ 0 ].start._getTransformedByDeletion( sourcePosition, howMany ),\n\t\t\t\tdifferenceSet[ 0 ].end._getTransformedByDeletion( sourcePosition, howMany )\n\t\t\t);\n\t\t} else if ( differenceSet.length == 2 ) {\n\t\t\t// `moveRange` is inside this range.\n\t\t\tdifference = new Range(\n\t\t\t\tthis.start,\n\t\t\t\tthis.end._getTransformedByDeletion( sourcePosition, howMany )\n\t\t\t);\n\t\t} // else, `moveRange` contains this range.\n\n\t\tif ( difference ) {\n\t\t\tresult = difference._getTransformedByInsertion( insertPosition, howMany, common !== null || spread );\n\t\t} else {\n\t\t\tresult = [];\n\t\t}\n\n\t\tif ( common ) {\n\t\t\tconst transformedCommon = new Range(\n\t\t\t\tcommon.start._getCombined( moveRange.start, insertPosition ),\n\t\t\t\tcommon.end._getCombined( moveRange.start, insertPosition )\n\t\t\t);\n\n\t\t\tif ( result.length == 2 ) {\n\t\t\t\tresult.splice( 1, 0, transformedCommon );\n\t\t\t} else {\n\t\t\t\tresult.push( transformedCommon );\n\t\t\t}\n\t\t}\n\n\t\treturn result;\n\t}\n\n\t/**\n\t * Returns a copy of this range that is transformed by deletion of `howMany` nodes from `deletePosition`.\n\t *\n\t * If the deleted range is intersecting with the transformed range, the transformed range will be shrank.\n\t *\n\t * If the deleted range contains transformed range, `null` will be returned.\n\t *\n\t * @protected\n\t * @param {module:engine/model/position~Position} deletionPosition Position from which nodes are removed.\n\t * @param {Number} howMany How many nodes are removed.\n\t * @returns {module:engine/model/range~Range|null} Result of the transformation.\n\t */\n\t_getTransformedByDeletion( deletePosition, howMany ) {\n\t\tlet newStart = this.start._getTransformedByDeletion( deletePosition, howMany );\n\t\tlet newEnd = this.end._getTransformedByDeletion( deletePosition, howMany );\n\n\t\tif ( newStart == null && newEnd == null ) {\n\t\t\treturn null;\n\t\t}\n\n\t\tif ( newStart == null ) {\n\t\t\tnewStart = deletePosition;\n\t\t}\n\n\t\tif ( newEnd == null ) {\n\t\t\tnewEnd = deletePosition;\n\t\t}\n\n\t\treturn new Range( newStart, newEnd );\n\t}\n\n\t/**\n\t * Creates a new range, spreading from specified {@link module:engine/model/position~Position position} to a position moved by\n\t * given `shift`. If `shift` is a negative value, shifted position is treated as the beginning of the range.\n\t *\n\t * @protected\n\t * @param {module:engine/model/position~Position} position Beginning of the range.\n\t * @param {Number} shift How long the range should be.\n\t * @returns {module:engine/model/range~Range}\n\t */\n\tstatic _createFromPositionAndShift( position, shift ) {\n\t\tconst start = position;\n\t\tconst end = position.getShiftedBy( shift );\n\n\t\treturn shift > 0 ? new this( start, end ) : new this( end, start );\n\t}\n\n\t/**\n\t * Creates a range inside an {@link module:engine/model/element~Element element} which starts before the first child of\n\t * that element and ends after the last child of that element.\n\t *\n\t * @protected\n\t * @param {module:engine/model/element~Element} element Element which is a parent for the range.\n\t * @returns {module:engine/model/range~Range}\n\t */\n\tstatic _createIn( element ) {\n\t\treturn new this( Position._createAt( element, 0 ), Position._createAt( element, element.maxOffset ) );\n\t}\n\n\t/**\n\t * Creates a range that starts before given {@link module:engine/model/item~Item model item} and ends after it.\n\t *\n\t * @protected\n\t * @param {module:engine/model/item~Item} item\n\t * @returns {module:engine/model/range~Range}\n\t */\n\tstatic _createOn( item ) {\n\t\treturn this._createFromPositionAndShift( Position._createBefore( item ), item.offsetSize );\n\t}\n\n\t/**\n\t * Combines all ranges from the passed array into a one range. At least one range has to be passed.\n\t * Passed ranges must not have common parts.\n\t *\n\t * The first range from the array is a reference range. If other ranges start or end on the exactly same position where\n\t * the reference range, they get combined into one range.\n\t *\n\t *\t\t[  ][]  [    ][ ][             ][ ][]  [  ]  // Passed ranges, shown sorted\n\t *\t\t[    ]                                       // The result of the function if the first range was a reference range.\n\t *\t            [                           ]        // The result of the function if the third-to-seventh range was a reference range.\n\t *\t                                           [  ]  // The result of the function if the last range was a reference range.\n\t *\n\t * @param {Array.<module:engine/model/range~Range>} ranges Ranges to combine.\n\t * @returns {module:engine/model/range~Range} Combined range.\n\t */\n\tstatic _createFromRanges( ranges ) {\n\t\tif ( ranges.length === 0 ) {\n\t\t\t/**\n\t\t\t * At least one range has to be passed to\n\t\t\t * {@link module:engine/model/range~Range._createFromRanges `Range._createFromRanges()`}.\n\t\t\t *\n\t\t\t * @error range-create-from-ranges-empty-array\n\t\t\t */\n\t\t\tthrow new CKEditorError(\n\t\t\t\t'range-create-from-ranges-empty-array',\n\t\t\t\tnull\n\t\t\t);\n\t\t} else if ( ranges.length == 1 ) {\n\t\t\treturn ranges[ 0 ].clone();\n\t\t}\n\n\t\t// 1. Set the first range in `ranges` array as a reference range.\n\t\t// If we are going to return just a one range, one of the ranges need to be the reference one.\n\t\t// Other ranges will be stuck to that range, if possible.\n\t\tconst ref = ranges[ 0 ];\n\n\t\t// 2. Sort all the ranges so it's easier to process them.\n\t\tranges.sort( ( a, b ) => {\n\t\t\treturn a.start.isAfter( b.start ) ? 1 : -1;\n\t\t} );\n\n\t\t// 3. Check at which index the reference range is now.\n\t\tconst refIndex = ranges.indexOf( ref );\n\n\t\t// 4. At this moment we don't need the original range.\n\t\t// We are going to modify the result and we need to return a new instance of Range.\n\t\t// We have to create a copy of the reference range.\n\t\tconst result = new this( ref.start, ref.end );\n\n\t\t// 5. Ranges should be checked and glued starting from the range that is closest to the reference range.\n\t\t// Since ranges are sorted, start with the range with index that is closest to reference range index.\n\t\tif ( refIndex > 0 ) {\n\t\t\tfor ( let i = refIndex - 1; true; i++ ) {\n\t\t\t\tif ( ranges[ i ].end.isEqual( result.start ) ) {\n\t\t\t\t\tresult.start = Position._createAt( ranges[ i ].start );\n\t\t\t\t} else {\n\t\t\t\t\t// If ranges are not starting/ending at the same position there is no point in looking further.\n\t\t\t\t\tbreak;\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\n\t\t// 6. Ranges should be checked and glued starting from the range that is closest to the reference range.\n\t\t// Since ranges are sorted, start with the range with index that is closest to reference range index.\n\t\tfor ( let i = refIndex + 1; i < ranges.length; i++ ) {\n\t\t\tif ( ranges[ i ].start.isEqual( result.end ) ) {\n\t\t\t\tresult.end = Position._createAt( ranges[ i ].end );\n\t\t\t} else {\n\t\t\t\t// If ranges are not starting/ending at the same position there is no point in looking further.\n\t\t\t\tbreak;\n\t\t\t}\n\t\t}\n\n\t\treturn result;\n\t}\n\n\t/**\n\t * Creates a `Range` instance from given plain object (i.e. parsed JSON string).\n\t *\n\t * @param {Object} json Plain object to be converted to `Range`.\n\t * @param {module:engine/model/document~Document} doc Document object that will be range owner.\n\t * @returns {module:engine/model/element~Element} `Range` instance created using given plain object.\n\t */\n\tstatic fromJSON( json, doc ) {\n\t\treturn new this( Position.fromJSON( json.start, doc ), Position.fromJSON( json.end, doc ) );\n\t}\n\n\t// @if CK_DEBUG_ENGINE // toString() {\n\t// @if CK_DEBUG_ENGINE // \treturn `${ this.root } [ ${ this.start.path.join( ', ' ) } ] - [ ${ this.end.path.join( ', ' ) } ]`;\n\t// @if CK_DEBUG_ENGINE // }\n\n\t// @if CK_DEBUG_ENGINE // log() {\n\t// @if CK_DEBUG_ENGINE // \tconsole.log( 'ModelPosition: ' + this );\n\t// @if CK_DEBUG_ENGINE // }\n}\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module engine/conversion/mapper\n */\n\nimport ModelPosition from '../model/position';\nimport ModelRange from '../model/range';\n\nimport ViewPosition from '../view/position';\nimport ViewRange from '../view/range';\nimport ViewText from '../view/text';\n\nimport EmitterMixin from '@ckeditor/ckeditor5-utils/src/emittermixin';\nimport mix from '@ckeditor/ckeditor5-utils/src/mix';\n\n/**\n * Maps elements, positions and markers between {@link module:engine/view/document~Document the view} and\n * {@link module:engine/model/model the model}.\n *\n * The instance of the Mapper used for the editing pipeline is available in\n * {@link module:engine/controller/editingcontroller~EditingController#mapper `editor.editing.mapper`}.\n *\n * Mapper uses bound elements to find corresponding elements and positions, so, to get proper results,\n * all model elements should be {@link module:engine/conversion/mapper~Mapper#bindElements bound}.\n *\n * To map complex model to/from view relations, you may provide custom callbacks for\n * {@link module:engine/conversion/mapper~Mapper#event:modelToViewPosition modelToViewPosition event} and\n * {@link module:engine/conversion/mapper~Mapper#event:viewToModelPosition viewToModelPosition event} that are fired whenever\n * a position mapping request occurs.\n * Those events are fired by {@link module:engine/conversion/mapper~Mapper#toViewPosition toViewPosition}\n * and {@link module:engine/conversion/mapper~Mapper#toModelPosition toModelPosition} methods. `Mapper` adds it's own default callbacks\n * with `'lowest'` priority. To override default `Mapper` mapping, add custom callback with higher priority and\n * stop the event.\n */\nexport default class Mapper {\n\t/**\n\t * Creates an instance of the mapper.\n\t */\n\tconstructor() {\n\t\t/**\n\t\t * Model element to view element mapping.\n\t\t *\n\t\t * @private\n\t\t * @member {WeakMap}\n\t\t */\n\t\tthis._modelToViewMapping = new WeakMap();\n\n\t\t/**\n\t\t * View element to model element mapping.\n\t\t *\n\t\t * @private\n\t\t * @member {WeakMap}\n\t\t */\n\t\tthis._viewToModelMapping = new WeakMap();\n\n\t\t/**\n\t\t * A map containing callbacks between view element names and functions evaluating length of view elements\n\t\t * in model.\n\t\t *\n\t\t * @private\n\t\t * @member {Map}\n\t\t */\n\t\tthis._viewToModelLengthCallbacks = new Map();\n\n\t\t/**\n\t\t * Model marker name to view elements mapping.\n\t\t *\n\t\t * Keys are `String`s while values are `Set`s with {@link module:engine/view/element~Element view elements}.\n\t\t * One marker (name) can be mapped to multiple elements.\n\t\t *\n\t\t * @private\n\t\t * @member {Map}\n\t\t */\n\t\tthis._markerNameToElements = new Map();\n\n\t\t/**\n\t\t * View element to model marker names mapping.\n\t\t *\n\t\t * This is reverse to {@link ~Mapper#_markerNameToElements} map.\n\t\t *\n\t\t * @private\n\t\t * @member {Map}\n\t\t */\n\t\tthis._elementToMarkerNames = new Map();\n\n\t\t/**\n\t\t * Stores marker names of markers which has changed due to unbinding a view element (so it is assumed that the view element\n\t\t * has been removed, moved or renamed).\n\t\t *\n\t\t * @private\n\t\t * @member {Set.<module:engine/model/markercollection~Marker>}\n\t\t */\n\t\tthis._unboundMarkerNames = new Set();\n\n\t\t// Default mapper algorithm for mapping model position to view position.\n\t\tthis.on( 'modelToViewPosition', ( evt, data ) => {\n\t\t\tif ( data.viewPosition ) {\n\t\t\t\treturn;\n\t\t\t}\n\n\t\t\tconst viewContainer = this._modelToViewMapping.get( data.modelPosition.parent );\n\n\t\t\tdata.viewPosition = this.findPositionIn( viewContainer, data.modelPosition.offset );\n\t\t}, { priority: 'low' } );\n\n\t\t// Default mapper algorithm for mapping view position to model position.\n\t\tthis.on( 'viewToModelPosition', ( evt, data ) => {\n\t\t\tif ( data.modelPosition ) {\n\t\t\t\treturn;\n\t\t\t}\n\n\t\t\tconst viewBlock = this.findMappedViewAncestor( data.viewPosition );\n\t\t\tconst modelParent = this._viewToModelMapping.get( viewBlock );\n\t\t\tconst modelOffset = this._toModelOffset( data.viewPosition.parent, data.viewPosition.offset, viewBlock );\n\n\t\t\tdata.modelPosition = ModelPosition._createAt( modelParent, modelOffset );\n\t\t}, { priority: 'low' } );\n\t}\n\n\t/**\n\t * Marks model and view elements as corresponding. Corresponding elements can be retrieved by using\n\t * the {@link module:engine/conversion/mapper~Mapper#toModelElement toModelElement} and\n\t * {@link module:engine/conversion/mapper~Mapper#toViewElement toViewElement} methods.\n\t * The information that elements are bound is also used to translate positions.\n\t *\n\t * @param {module:engine/model/element~Element} modelElement Model element.\n\t * @param {module:engine/view/element~Element} viewElement View element.\n\t */\n\tbindElements( modelElement, viewElement ) {\n\t\tthis._modelToViewMapping.set( modelElement, viewElement );\n\t\tthis._viewToModelMapping.set( viewElement, modelElement );\n\t}\n\n\t/**\n\t * Unbinds given {@link module:engine/view/element~Element view element} from the map.\n\t *\n\t * **Note:** view-to-model binding will be removed, if it existed. However, corresponding model-to-view binding\n\t * will be removed only if model element is still bound to passed `viewElement`.\n\t *\n\t * This behavior lets for re-binding model element to another view element without fear of losing the new binding\n\t * when the previously bound view element is unbound.\n\t *\n\t * @param {module:engine/view/element~Element} viewElement View element to unbind.\n\t */\n\tunbindViewElement( viewElement ) {\n\t\tconst modelElement = this.toModelElement( viewElement );\n\n\t\tthis._viewToModelMapping.delete( viewElement );\n\n\t\tif ( this._elementToMarkerNames.has( viewElement ) ) {\n\t\t\tfor ( const markerName of this._elementToMarkerNames.get( viewElement ) ) {\n\t\t\t\tthis._unboundMarkerNames.add( markerName );\n\t\t\t}\n\t\t}\n\n\t\tif ( this._modelToViewMapping.get( modelElement ) == viewElement ) {\n\t\t\tthis._modelToViewMapping.delete( modelElement );\n\t\t}\n\t}\n\n\t/**\n\t * Unbinds given {@link module:engine/model/element~Element model element} from the map.\n\t *\n\t * **Note:** model-to-view binding will be removed, if it existed. However, corresponding view-to-model binding\n\t * will be removed only if view element is still bound to passed `modelElement`.\n\t *\n\t * This behavior lets for re-binding view element to another model element without fear of losing the new binding\n\t * when the previously bound model element is unbound.\n\t *\n\t * @param {module:engine/model/element~Element} modelElement Model element to unbind.\n\t */\n\tunbindModelElement( modelElement ) {\n\t\tconst viewElement = this.toViewElement( modelElement );\n\n\t\tthis._modelToViewMapping.delete( modelElement );\n\n\t\tif ( this._viewToModelMapping.get( viewElement ) == modelElement ) {\n\t\t\tthis._viewToModelMapping.delete( viewElement );\n\t\t}\n\t}\n\n\t/**\n\t * Binds given marker name with given {@link module:engine/view/element~Element view element}. The element\n\t * will be added to the current set of elements bound with given marker name.\n\t *\n\t * @param {module:engine/view/element~Element} element Element to bind.\n\t * @param {String} name Marker name.\n\t */\n\tbindElementToMarker( element, name ) {\n\t\tconst elements = this._markerNameToElements.get( name ) || new Set();\n\t\telements.add( element );\n\n\t\tconst names = this._elementToMarkerNames.get( element ) || new Set();\n\t\tnames.add( name );\n\n\t\tthis._markerNameToElements.set( name, elements );\n\t\tthis._elementToMarkerNames.set( element, names );\n\t}\n\n\t/**\n\t * Unbinds an element from given marker name.\n\t *\n\t * @param {module:engine/view/element~Element} element Element to unbind.\n\t * @param {String} name Marker name.\n\t */\n\tunbindElementFromMarkerName( element, name ) {\n\t\tconst nameToElements = this._markerNameToElements.get( name );\n\n\t\tif ( nameToElements ) {\n\t\t\tnameToElements.delete( element );\n\n\t\t\tif ( nameToElements.size == 0 ) {\n\t\t\t\tthis._markerNameToElements.delete( name );\n\t\t\t}\n\t\t}\n\n\t\tconst elementToNames = this._elementToMarkerNames.get( element );\n\n\t\tif ( elementToNames ) {\n\t\t\telementToNames.delete( name );\n\n\t\t\tif ( elementToNames.size == 0 ) {\n\t\t\t\tthis._elementToMarkerNames.delete( element );\n\t\t\t}\n\t\t}\n\t}\n\n\t/**\n\t * Returns all marker names of markers which has changed due to unbinding a view element (so it is assumed that the view element\n\t * has been removed, moved or renamed) since the last flush. After returning, the marker names list is cleared.\n\t *\n\t * @returns {Array.<String>}\n\t */\n\tflushUnboundMarkerNames() {\n\t\tconst markerNames = Array.from( this._unboundMarkerNames );\n\n\t\tthis._unboundMarkerNames.clear();\n\n\t\treturn markerNames;\n\t}\n\n\t/**\n\t * Removes all model to view and view to model bindings.\n\t */\n\tclearBindings() {\n\t\tthis._modelToViewMapping = new WeakMap();\n\t\tthis._viewToModelMapping = new WeakMap();\n\t\tthis._markerNameToElements = new Map();\n\t\tthis._elementToMarkerNames = new Map();\n\t\tthis._unboundMarkerNames = new Set();\n\t}\n\n\t/**\n\t * Gets the corresponding model element.\n\t *\n\t * **Note:** {@link module:engine/view/uielement~UIElement} does not have corresponding element in model.\n\t *\n\t * @param {module:engine/view/element~Element} viewElement View element.\n\t * @returns {module:engine/model/element~Element|undefined} Corresponding model element or `undefined` if not found.\n\t */\n\ttoModelElement( viewElement ) {\n\t\treturn this._viewToModelMapping.get( viewElement );\n\t}\n\n\t/**\n\t * Gets the corresponding view element.\n\t *\n\t * @param {module:engine/model/element~Element} modelElement Model element.\n\t * @returns {module:engine/view/element~Element|undefined} Corresponding view element or `undefined` if not found.\n\t */\n\ttoViewElement( modelElement ) {\n\t\treturn this._modelToViewMapping.get( modelElement );\n\t}\n\n\t/**\n\t * Gets the corresponding model range.\n\t *\n\t * @param {module:engine/view/range~Range} viewRange View range.\n\t * @returns {module:engine/model/range~Range} Corresponding model range.\n\t */\n\ttoModelRange( viewRange ) {\n\t\treturn new ModelRange( this.toModelPosition( viewRange.start ), this.toModelPosition( viewRange.end ) );\n\t}\n\n\t/**\n\t * Gets the corresponding view range.\n\t *\n\t * @param {module:engine/model/range~Range} modelRange Model range.\n\t * @returns {module:engine/view/range~Range} Corresponding view range.\n\t */\n\ttoViewRange( modelRange ) {\n\t\treturn new ViewRange( this.toViewPosition( modelRange.start ), this.toViewPosition( modelRange.end ) );\n\t}\n\n\t/**\n\t * Gets the corresponding model position.\n\t *\n\t * @fires viewToModelPosition\n\t * @param {module:engine/view/position~Position} viewPosition View position.\n\t * @returns {module:engine/model/position~Position} Corresponding model position.\n\t */\n\ttoModelPosition( viewPosition ) {\n\t\tconst data = {\n\t\t\tviewPosition,\n\t\t\tmapper: this\n\t\t};\n\n\t\tthis.fire( 'viewToModelPosition', data );\n\n\t\treturn data.modelPosition;\n\t}\n\n\t/**\n\t * Gets the corresponding view position.\n\t *\n\t * @fires modelToViewPosition\n\t * @param {module:engine/model/position~Position} modelPosition Model position.\n\t * @param {Object} [options] Additional options for position mapping process.\n\t * @param {Boolean} [options.isPhantom=false] Should be set to `true` if the model position to map is pointing to a place\n\t * in model tree which no longer exists. For example, it could be an end of a removed model range.\n\t * @returns {module:engine/view/position~Position} Corresponding view position.\n\t */\n\ttoViewPosition( modelPosition, options = { isPhantom: false } ) {\n\t\tconst data = {\n\t\t\tmodelPosition,\n\t\t\tmapper: this,\n\t\t\tisPhantom: options.isPhantom\n\t\t};\n\n\t\tthis.fire( 'modelToViewPosition', data );\n\n\t\treturn data.viewPosition;\n\t}\n\n\t/**\n\t * Gets all view elements bound to the given marker name.\n\t *\n\t * @param {String} name Marker name.\n\t * @returns {Set.<module:engine/view/element~Element>|null} View elements bound with given marker name or `null`\n\t * if no elements are bound to given marker name.\n\t */\n\tmarkerNameToElements( name ) {\n\t\tconst boundElements = this._markerNameToElements.get( name );\n\n\t\tif ( !boundElements ) {\n\t\t\treturn null;\n\t\t}\n\n\t\tconst elements = new Set();\n\n\t\tfor ( const element of boundElements ) {\n\t\t\tif ( element.is( 'attributeElement' ) ) {\n\t\t\t\tfor ( const clone of element.getElementsWithSameId() ) {\n\t\t\t\t\telements.add( clone );\n\t\t\t\t}\n\t\t\t} else {\n\t\t\t\telements.add( element );\n\t\t\t}\n\t\t}\n\n\t\treturn elements;\n\t}\n\n\t/**\n\t * Registers a callback that evaluates the length in the model of a view element with given name.\n\t *\n\t * The callback is fired with one argument, which is a view element instance. The callback is expected to return\n\t * a number representing the length of view element in model.\n\t *\n\t *\t\t// List item in view may contain nested list, which have other list items. In model though,\n\t *\t\t// the lists are represented by flat structure. Because of those differences, length of list view element\n\t *\t\t// may be greater than one. In the callback it's checked how many nested list items are in evaluated list item.\n\t *\n\t *\t\tfunction getViewListItemLength( element ) {\n\t *\t\t\tlet length = 1;\n\t *\n\t *\t\t\tfor ( let child of element.getChildren() ) {\n\t *\t\t\t\tif ( child.name == 'ul' || child.name == 'ol' ) {\n\t *\t\t\t\t\tfor ( let item of child.getChildren() ) {\n\t *\t\t\t\t\t\tlength += getViewListItemLength( item );\n\t *\t\t\t\t\t}\n\t *\t\t\t\t}\n\t *\t\t\t}\n\t *\n\t *\t\t\treturn length;\n\t *\t\t}\n\t *\n\t *\t\tmapper.registerViewToModelLength( 'li', getViewListItemLength );\n\t *\n\t * @param {String} viewElementName Name of view element for which callback is registered.\n\t * @param {Function} lengthCallback Function return a length of view element instance in model.\n\t */\n\tregisterViewToModelLength( viewElementName, lengthCallback ) {\n\t\tthis._viewToModelLengthCallbacks.set( viewElementName, lengthCallback );\n\t}\n\n\t/**\n\t * For given `viewPosition`, finds and returns the closest ancestor of this position that has a mapping to\n\t * the model.\n\t *\n\t * @param {module:engine/view/position~Position} viewPosition Position for which mapped ancestor should be found.\n\t * @returns {module:engine/view/element~Element}\n\t */\n\tfindMappedViewAncestor( viewPosition ) {\n\t\tlet parent = viewPosition.parent;\n\n\t\twhile ( !this._viewToModelMapping.has( parent ) ) {\n\t\t\tparent = parent.parent;\n\t\t}\n\n\t\treturn parent;\n\t}\n\n\t/**\n\t * Calculates model offset based on the view position and the block element.\n\t *\n\t * Example:\n\t *\n\t *\t\t<p>foo<b>ba|r</b></p> // _toModelOffset( b, 2, p ) -> 5\n\t *\n\t * Is a sum of:\n\t *\n\t *\t\t<p>foo|<b>bar</b></p> // _toModelOffset( p, 3, p ) -> 3\n\t *\t\t<p>foo<b>ba|r</b></p> // _toModelOffset( b, 2, b ) -> 2\n\t *\n\t * @private\n\t * @param {module:engine/view/element~Element} viewParent Position parent.\n\t * @param {Number} viewOffset Position offset.\n\t * @param {module:engine/view/element~Element} viewBlock Block used as a base to calculate offset.\n\t * @returns {Number} Offset in the model.\n\t */\n\t_toModelOffset( viewParent, viewOffset, viewBlock ) {\n\t\tif ( viewBlock != viewParent ) {\n\t\t\t// See example.\n\t\t\tconst offsetToParentStart = this._toModelOffset( viewParent.parent, viewParent.index, viewBlock );\n\t\t\tconst offsetInParent = this._toModelOffset( viewParent, viewOffset, viewParent );\n\n\t\t\treturn offsetToParentStart + offsetInParent;\n\t\t}\n\n\t\t// viewBlock == viewParent, so we need to calculate the offset in the parent element.\n\n\t\t// If the position is a text it is simple (\"ba|r\" -> 2).\n\t\tif ( viewParent.is( '$text' ) ) {\n\t\t\treturn viewOffset;\n\t\t}\n\n\t\t// If the position is in an element we need to sum lengths of siblings ( <b> bar </b> foo | -> 3 + 3 = 6 ).\n\t\tlet modelOffset = 0;\n\n\t\tfor ( let i = 0; i < viewOffset; i++ ) {\n\t\t\tmodelOffset += this.getModelLength( viewParent.getChild( i ) );\n\t\t}\n\n\t\treturn modelOffset;\n\t}\n\n\t/**\n\t * Gets the length of the view element in the model.\n\t *\n\t * The length is calculated as follows:\n\t * * if {@link #registerViewToModelLength length mapping callback} is provided for given `viewNode` it is used to\n\t * evaluate model length (`viewNode` is used as first and only parameter passed to the callback),\n\t * * length of a {@link module:engine/view/text~Text text node} is equal to the length of it's\n\t * {@link module:engine/view/text~Text#data data},\n\t * * length of a {@link module:engine/view/uielement~UIElement ui element} is equal to 0,\n\t * * length of a mapped {@link module:engine/view/element~Element element} is equal to 1,\n\t * * length of a not-mapped {@link module:engine/view/element~Element element} is equal to the length of it's children.\n\t *\n\t * Examples:\n\t *\n\t *\t\tfoo                          -> 3 // Text length is equal to it's data length.\n\t *\t\t<p>foo</p>                   -> 1 // Length of an element which is mapped is by default equal to 1.\n\t *\t\t<b>foo</b>                   -> 3 // Length of an element which is not mapped is a length of its children.\n\t *\t\t<div><p>x</p><p>y</p></div>  -> 2 // Assuming that <div> is not mapped and <p> are mapped.\n\t *\n\t * @param {module:engine/view/element~Element} viewNode View node.\n\t * @returns {Number} Length of the node in the tree model.\n\t */\n\tgetModelLength( viewNode ) {\n\t\tif ( this._viewToModelLengthCallbacks.get( viewNode.name ) ) {\n\t\t\tconst callback = this._viewToModelLengthCallbacks.get( viewNode.name );\n\n\t\t\treturn callback( viewNode );\n\t\t} else if ( this._viewToModelMapping.has( viewNode ) ) {\n\t\t\treturn 1;\n\t\t} else if ( viewNode.is( '$text' ) ) {\n\t\t\treturn viewNode.data.length;\n\t\t} else if ( viewNode.is( 'uiElement' ) ) {\n\t\t\treturn 0;\n\t\t} else {\n\t\t\tlet len = 0;\n\n\t\t\tfor ( const child of viewNode.getChildren() ) {\n\t\t\t\tlen += this.getModelLength( child );\n\t\t\t}\n\n\t\t\treturn len;\n\t\t}\n\t}\n\n\t/**\n\t * Finds the position in the view node (or its children) with the expected model offset.\n\t *\n\t * Example:\n\t *\n\t *\t\t<p>fo<b>bar</b>bom</p> -> expected offset: 4\n\t *\n\t *\t\tfindPositionIn( p, 4 ):\n\t *\t\t<p>|fo<b>bar</b>bom</p> -> expected offset: 4, actual offset: 0\n\t *\t\t<p>fo|<b>bar</b>bom</p> -> expected offset: 4, actual offset: 2\n\t *\t\t<p>fo<b>bar</b>|bom</p> -> expected offset: 4, actual offset: 5 -> we are too far\n\t *\n\t *\t\tfindPositionIn( b, 4 - ( 5 - 3 ) ):\n\t *\t\t<p>fo<b>|bar</b>bom</p> -> expected offset: 2, actual offset: 0\n\t *\t\t<p>fo<b>bar|</b>bom</p> -> expected offset: 2, actual offset: 3 -> we are too far\n\t *\n\t *\t\tfindPositionIn( bar, 2 - ( 3 - 3 ) ):\n\t *\t\tWe are in the text node so we can simple find the offset.\n\t *\t\t<p>fo<b>ba|r</b>bom</p> -> expected offset: 2, actual offset: 2 -> position found\n\t *\n\t * @param {module:engine/view/element~Element} viewParent Tree view element in which we are looking for the position.\n\t * @param {Number} expectedOffset Expected offset.\n\t * @returns {module:engine/view/position~Position} Found position.\n\t */\n\tfindPositionIn( viewParent, expectedOffset ) {\n\t\t// Last scanned view node.\n\t\tlet viewNode;\n\t\t// Length of the last scanned view node.\n\t\tlet lastLength = 0;\n\n\t\tlet modelOffset = 0;\n\t\tlet viewOffset = 0;\n\n\t\t// In the text node it is simple: offset in the model equals offset in the text.\n\t\tif ( viewParent.is( '$text' ) ) {\n\t\t\treturn new ViewPosition( viewParent, expectedOffset );\n\t\t}\n\n\t\t// In other cases we add lengths of child nodes to find the proper offset.\n\n\t\t// If it is smaller we add the length.\n\t\twhile ( modelOffset < expectedOffset ) {\n\t\t\tviewNode = viewParent.getChild( viewOffset );\n\t\t\tlastLength = this.getModelLength( viewNode );\n\t\t\tmodelOffset += lastLength;\n\t\t\tviewOffset++;\n\t\t}\n\n\t\t// If it equals we found the position.\n\t\tif ( modelOffset == expectedOffset ) {\n\t\t\treturn this._moveViewPositionToTextNode( new ViewPosition( viewParent, viewOffset ) );\n\t\t}\n\t\t// If it is higher we need to enter last child.\n\t\telse {\n\t\t\t// ( modelOffset - lastLength ) is the offset to the child we enter,\n\t\t\t// so we subtract it from the expected offset to fine the offset in the child.\n\t\t\treturn this.findPositionIn( viewNode, expectedOffset - ( modelOffset - lastLength ) );\n\t\t}\n\t}\n\n\t/**\n\t * Because we prefer positions in text nodes over positions next to text node moves view position to the text node\n\t * if it was next to it.\n\t *\n\t *\t\t<p>[]<b>foo</b></p> -> <p>[]<b>foo</b></p> // do not touch if position is not directly next to text\n\t *\t\t<p>foo[]<b>foo</b></p> -> <p>foo{}<b>foo</b></p> // move to text node\n\t *\t\t<p><b>[]foo</b></p> -> <p><b>{}foo</b></p> // move to text node\n\t *\n\t * @private\n\t * @param {module:engine/view/position~Position} viewPosition Position potentially next to text node.\n\t * @returns {module:engine/view/position~Position} Position in text node if possible.\n\t */\n\t_moveViewPositionToTextNode( viewPosition ) {\n\t\t// If the position is just after text node, put it at the end of that text node.\n\t\t// If the position is just before text node, put it at the beginning of that text node.\n\t\tconst nodeBefore = viewPosition.nodeBefore;\n\t\tconst nodeAfter = viewPosition.nodeAfter;\n\n\t\tif ( nodeBefore instanceof ViewText ) {\n\t\t\treturn new ViewPosition( nodeBefore, nodeBefore.data.length );\n\t\t} else if ( nodeAfter instanceof ViewText ) {\n\t\t\treturn new ViewPosition( nodeAfter, 0 );\n\t\t}\n\n\t\t// Otherwise, just return the given position.\n\t\treturn viewPosition;\n\t}\n\n\t/**\n\t * Fired for each model-to-view position mapping request. The purpose of this event is to enable custom model-to-view position\n\t * mapping. Callbacks added to this event take {@link module:engine/model/position~Position model position} and are expected to\n\t * calculate {@link module:engine/view/position~Position view position}. Calculated view position should be added as `viewPosition`\n\t * value in `data` object that is passed as one of parameters to the event callback.\n\t *\n\t * \t\t// Assume that \"captionedImage\" model element is converted to <img> and following <span> elements in view,\n\t * \t\t// and the model element is bound to <img> element. Force mapping model positions inside \"captionedImage\" to that\n\t * \t\t// <span> element.\n\t *\t\tmapper.on( 'modelToViewPosition', ( evt, data ) => {\n\t *\t\t\tconst positionParent = modelPosition.parent;\n\t *\n\t *\t\t\tif ( positionParent.name == 'captionedImage' ) {\n\t *\t\t\t\tconst viewImg = data.mapper.toViewElement( positionParent );\n\t *\t\t\t\tconst viewCaption = viewImg.nextSibling; // The <span> element.\n\t *\n\t *\t\t\t\tdata.viewPosition = new ViewPosition( viewCaption, modelPosition.offset );\n\t *\n\t *\t\t\t\t// Stop the event if other callbacks should not modify calculated value.\n\t *\t\t\t\tevt.stop();\n\t *\t\t\t}\n\t *\t\t} );\n\t *\n\t * **Note:** keep in mind that sometimes a \"phantom\" model position is being converted. \"Phantom\" model position is\n\t * a position that points to a non-existing place in model. Such position might still be valid for conversion, though\n\t * (it would point to a correct place in view when converted). One example of such situation is when a range is\n\t * removed from model, there may be a need to map the range's end (which is no longer valid model position). To\n\t * handle such situation, check `data.isPhantom` flag:\n\t *\n\t * \t\t// Assume that there is \"customElement\" model element and whenever position is before it, we want to move it\n\t * \t\t// to the inside of the view element bound to \"customElement\".\n\t *\t\tmapper.on( 'modelToViewPosition', ( evt, data ) => {\n\t *\t\t\tif ( data.isPhantom ) {\n\t *\t\t\t\treturn;\n\t *\t\t\t}\n\t *\n\t *\t\t\t// Below line might crash for phantom position that does not exist in model.\n\t *\t\t\tconst sibling = data.modelPosition.nodeBefore;\n\t *\n\t *\t\t\t// Check if this is the element we are interested in.\n\t *\t\t\tif ( !sibling.is( 'element', 'customElement' ) ) {\n\t *\t\t\t\treturn;\n\t *\t\t\t}\n\t *\n\t *\t\t\tconst viewElement = data.mapper.toViewElement( sibling );\n\t *\n\t *\t\t\tdata.viewPosition = new ViewPosition( sibling, 0 );\n\t *\n\t *\t\t\tevt.stop();\n\t *\t\t} );\n\t *\n\t * **Note:** default mapping callback is provided with `low` priority setting and does not cancel the event, so it is possible to\n\t * attach a custom callback after default callback and also use `data.viewPosition` calculated by default callback\n\t * (for example to fix it).\n\t *\n\t * **Note:** default mapping callback will not fire if `data.viewPosition` is already set.\n\t *\n\t * **Note:** these callbacks are called **very often**. For efficiency reasons, it is advised to use them only when position\n\t * mapping between given model and view elements is unsolvable using just elements mapping and default algorithm. Also,\n\t * the condition that checks if special case scenario happened should be as simple as possible.\n\t *\n\t * @event modelToViewPosition\n\t * @param {Object} data Data pipeline object that can store and pass data between callbacks. The callback should add\n\t * `viewPosition` value to that object with calculated {@link module:engine/view/position~Position view position}.\n\t * @param {module:engine/conversion/mapper~Mapper} data.mapper Mapper instance that fired the event.\n\t */\n\n\t/**\n\t * Fired for each view-to-model position mapping request. See {@link module:engine/conversion/mapper~Mapper#event:modelToViewPosition}.\n\t *\n\t * \t\t// See example in `modelToViewPosition` event description.\n\t * \t\t// This custom mapping will map positions from <span> element next to <img> to the \"captionedImage\" element.\n\t *\t\tmapper.on( 'viewToModelPosition', ( evt, data ) => {\n\t *\t\t\tconst positionParent = viewPosition.parent;\n\t *\n\t *\t\t\tif ( positionParent.hasClass( 'image-caption' ) ) {\n\t *\t\t\t\tconst viewImg = positionParent.previousSibling;\n\t *\t\t\t\tconst modelImg = data.mapper.toModelElement( viewImg );\n\t *\n\t *\t\t\t\tdata.modelPosition = new ModelPosition( modelImg, viewPosition.offset );\n\t *\t\t\t\tevt.stop();\n\t *\t\t\t}\n\t *\t\t} );\n\t *\n\t * **Note:** default mapping callback is provided with `low` priority setting and does not cancel the event, so it is possible to\n\t * attach a custom callback after default callback and also use `data.modelPosition` calculated by default callback\n\t * (for example to fix it).\n\t *\n\t * **Note:** default mapping callback will not fire if `data.modelPosition` is already set.\n\t *\n\t * **Note:** these callbacks are called **very often**. For efficiency reasons, it is advised to use them only when position\n\t * mapping between given model and view elements is unsolvable using just elements mapping and default algorithm. Also,\n\t * the condition that checks if special case scenario happened should be as simple as possible.\n\t *\n\t * @event viewToModelPosition\n\t * @param {Object} data Data pipeline object that can store and pass data between callbacks. The callback should add\n\t * `modelPosition` value to that object with calculated {@link module:engine/model/position~Position model position}.\n\t * @param {module:engine/conversion/mapper~Mapper} data.mapper Mapper instance that fired the event.\n\t */\n}\n\nmix( Mapper, EmitterMixin );\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module engine/conversion/modelconsumable\n */\n\nimport TextProxy from '../model/textproxy';\n\n/**\n * Manages a list of consumable values for {@link module:engine/model/item~Item model items}.\n *\n * Consumables are various aspects of the model. A model item can be broken down into singular properties that might be\n * taken into consideration when converting that item.\n *\n * `ModelConsumable` is used by {@link module:engine/conversion/downcastdispatcher~DowncastDispatcher} while analyzing changed\n * parts of {@link module:engine/model/document~Document the document}. The added / changed / removed model items are broken down\n * into singular properties (the item itself and it's attributes). All those parts are saved in `ModelConsumable`. Then,\n * during conversion, when given part of model item is converted (i.e. the view element has been inserted into the view,\n * but without attributes), consumable value is removed from `ModelConsumable`.\n *\n * For model items, `ModelConsumable` stores consumable values of one of following types: `insert`, `addattribute:<attributeKey>`,\n * `changeattributes:<attributeKey>`, `removeattributes:<attributeKey>`.\n *\n * In most cases, it is enough to let {@link module:engine/conversion/downcastdispatcher~DowncastDispatcher}\n * gather consumable values, so there is no need to use\n * {@link module:engine/conversion/modelconsumable~ModelConsumable#add add method} directly.\n * However, it is important to understand how consumable values can be\n * {@link module:engine/conversion/modelconsumable~ModelConsumable#consume consumed}.\n * See {@link module:engine/conversion/downcasthelpers default downcast converters} for more information.\n *\n * Keep in mind, that one conversion event may have multiple callbacks (converters) attached to it. Each of those is\n * able to convert one or more parts of the model. However, when one of those callbacks actually converts\n * something, other should not, because they would duplicate the results. Using `ModelConsumable` helps avoiding\n * this situation, because callbacks should only convert those values, which were not yet consumed from `ModelConsumable`.\n *\n * Consuming multiple values in a single callback:\n *\n *\t\t// Converter for custom `image` element that might have a `caption` element inside which changes\n *\t\t// how the image is displayed in the view:\n *\t\t//\n *\t\t// Model:\n *\t\t//\n *\t\t// [image]\n *\t\t//   └─ [caption]\n *\t\t//       └─ foo\n *\t\t//\n *\t\t// View:\n *\t\t//\n *\t\t// <figure>\n *\t\t//   ├─ <img />\n *\t\t//   └─ <caption>\n *\t\t//       └─ foo\n *\t\tmodelConversionDispatcher.on( 'insert:image', ( evt, data, conversionApi ) => {\n *\t\t\t// First, consume the `image` element.\n *\t\t\tconversionApi.consumable.consume( data.item, 'insert' );\n *\n *\t\t\t// Just create normal image element for the view.\n *\t\t\t// Maybe it will be \"decorated\" later.\n *\t\t\tconst viewImage = new ViewElement( 'img' );\n *\t\t\tconst insertPosition = conversionApi.mapper.toViewPosition( data.range.start );\n *\t\t\tconst viewWriter = conversionApi.writer;\n *\n *\t\t\t// Check if the `image` element has children.\n *\t\t\tif ( data.item.childCount > 0 ) {\n *\t\t\t\tconst modelCaption = data.item.getChild( 0 );\n *\n *\t\t\t\t// `modelCaption` insertion change is consumed from consumable values.\n *\t\t\t\t// It will not be converted by other converters, but it's children (probably some text) will be.\n *\t\t\t\t// Through mapping, converters for text will know where to insert contents of `modelCaption`.\n *\t\t\t\tif ( conversionApi.consumable.consume( modelCaption, 'insert' ) ) {\n *\t\t\t\t\tconst viewCaption = new ViewElement( 'figcaption' );\n *\n *\t\t\t\t\tconst viewImageHolder = new ViewElement( 'figure', null, [ viewImage, viewCaption ] );\n *\n *\t\t\t\t\tconversionApi.mapper.bindElements( modelCaption, viewCaption );\n *\t\t\t\t\tconversionApi.mapper.bindElements( data.item, viewImageHolder );\n *\t\t\t\t\tviewWriter.insert( insertPosition, viewImageHolder );\n *\t\t\t\t}\n *\t\t\t} else {\n *\t\t\t\tconversionApi.mapper.bindElements( data.item, viewImage );\n *\t\t\t\tviewWriter.insert( insertPosition, viewImage );\n *\t\t\t}\n *\n *\t\t\tevt.stop();\n *\t\t} );\n */\nexport default class ModelConsumable {\n\t/**\n\t * Creates an empty consumables list.\n\t */\n\tconstructor() {\n\t\t/**\n\t\t * Contains list of consumable values.\n\t\t *\n\t\t * @private\n\t\t * @member {Map} module:engine/conversion/modelconsumable~ModelConsumable#_consumable\n\t\t */\n\t\tthis._consumable = new Map();\n\n\t\t/**\n\t\t * For each {@link module:engine/model/textproxy~TextProxy} added to `ModelConsumable`, this registry holds parent\n\t\t * of that `TextProxy` and start and end indices of that `TextProxy`. This allows identification of `TextProxy`\n\t\t * instances that points to the same part of the model but are different instances. Each distinct `TextProxy`\n\t\t * is given unique `Symbol` which is then registered as consumable. This process is transparent for `ModelConsumable`\n\t\t * API user because whenever `TextProxy` is added, tested, consumed or reverted, internal mechanisms of\n\t\t * `ModelConsumable` translates `TextProxy` to that unique `Symbol`.\n\t\t *\n\t\t * @private\n\t\t * @member {Map} module:engine/conversion/modelconsumable~ModelConsumable#_textProxyRegistry\n\t\t */\n\t\tthis._textProxyRegistry = new Map();\n\t}\n\n\t/**\n\t * Adds a consumable value to the consumables list and links it with given model item.\n\t *\n\t *\t\tmodelConsumable.add( modelElement, 'insert' ); // Add `modelElement` insertion change to consumable values.\n\t *\t\tmodelConsumable.add( modelElement, 'addAttribute:bold' ); // Add `bold` attribute insertion on `modelElement` change.\n\t *\t\tmodelConsumable.add( modelElement, 'removeAttribute:bold' ); // Add `bold` attribute removal on `modelElement` change.\n\t *\t\tmodelConsumable.add( modelSelection, 'selection' ); // Add `modelSelection` to consumable values.\n\t *\t\tmodelConsumable.add( modelRange, 'range' ); // Add `modelRange` to consumable values.\n\t *\n\t * @param {module:engine/model/item~Item|module:engine/model/selection~Selection|module:engine/model/range~Range} item\n\t * Model item, range or selection that has the consumable.\n\t * @param {String} type Consumable type. Will be normalized to a proper form, that is either `<word>` or `<part>:<part>`.\n\t * Second colon and everything after will be cut. Passing event name is a safe and good practice.\n\t */\n\tadd( item, type ) {\n\t\ttype = _normalizeConsumableType( type );\n\n\t\tif ( item instanceof TextProxy ) {\n\t\t\titem = this._getSymbolForTextProxy( item );\n\t\t}\n\n\t\tif ( !this._consumable.has( item ) ) {\n\t\t\tthis._consumable.set( item, new Map() );\n\t\t}\n\n\t\tthis._consumable.get( item ).set( type, true );\n\t}\n\n\t/**\n\t * Removes given consumable value from given model item.\n\t *\n\t *\t\tmodelConsumable.consume( modelElement, 'insert' ); // Remove `modelElement` insertion change from consumable values.\n\t *\t\tmodelConsumable.consume( modelElement, 'addAttribute:bold' ); // Remove `bold` attribute insertion on `modelElement` change.\n\t *\t\tmodelConsumable.consume( modelElement, 'removeAttribute:bold' ); // Remove `bold` attribute removal on `modelElement` change.\n\t *\t\tmodelConsumable.consume( modelSelection, 'selection' ); // Remove `modelSelection` from consumable values.\n\t *\t\tmodelConsumable.consume( modelRange, 'range' ); // Remove 'modelRange' from consumable values.\n\t *\n\t * @param {module:engine/model/item~Item|module:engine/model/selection~Selection|module:engine/model/range~Range} item\n\t * Model item, range or selection from which consumable will be consumed.\n\t * @param {String} type Consumable type. Will be normalized to a proper form, that is either `<word>` or `<part>:<part>`.\n\t * Second colon and everything after will be cut. Passing event name is a safe and good practice.\n\t * @returns {Boolean} `true` if consumable value was available and was consumed, `false` otherwise.\n\t */\n\tconsume( item, type ) {\n\t\ttype = _normalizeConsumableType( type );\n\n\t\tif ( item instanceof TextProxy ) {\n\t\t\titem = this._getSymbolForTextProxy( item );\n\t\t}\n\n\t\tif ( this.test( item, type ) ) {\n\t\t\tthis._consumable.get( item ).set( type, false );\n\n\t\t\treturn true;\n\t\t} else {\n\t\t\treturn false;\n\t\t}\n\t}\n\n\t/**\n\t * Tests whether there is a consumable value of given type connected with given model item.\n\t *\n\t *\t\tmodelConsumable.test( modelElement, 'insert' ); // Check for `modelElement` insertion change.\n\t *\t\tmodelConsumable.test( modelElement, 'addAttribute:bold' ); // Check for `bold` attribute insertion on `modelElement` change.\n\t *\t\tmodelConsumable.test( modelElement, 'removeAttribute:bold' ); // Check for `bold` attribute removal on `modelElement` change.\n\t *\t\tmodelConsumable.test( modelSelection, 'selection' ); // Check if `modelSelection` is consumable.\n\t *\t\tmodelConsumable.test( modelRange, 'range' ); // Check if `modelRange` is consumable.\n\t *\n\t * @param {module:engine/model/item~Item|module:engine/model/selection~Selection|module:engine/model/range~Range} item\n\t * Model item, range or selection to be tested.\n\t * @param {String} type Consumable type. Will be normalized to a proper form, that is either `<word>` or `<part>:<part>`.\n\t * Second colon and everything after will be cut. Passing event name is a safe and good practice.\n\t * @returns {null|Boolean} `null` if such consumable was never added, `false` if the consumable values was\n\t * already consumed or `true` if it was added and not consumed yet.\n\t */\n\ttest( item, type ) {\n\t\ttype = _normalizeConsumableType( type );\n\n\t\tif ( item instanceof TextProxy ) {\n\t\t\titem = this._getSymbolForTextProxy( item );\n\t\t}\n\n\t\tconst itemConsumables = this._consumable.get( item );\n\n\t\tif ( itemConsumables === undefined ) {\n\t\t\treturn null;\n\t\t}\n\n\t\tconst value = itemConsumables.get( type );\n\n\t\tif ( value === undefined ) {\n\t\t\treturn null;\n\t\t}\n\n\t\treturn value;\n\t}\n\n\t/**\n\t * Reverts consuming of consumable value.\n\t *\n\t *\t\tmodelConsumable.revert( modelElement, 'insert' ); // Revert consuming `modelElement` insertion change.\n\t *\t\tmodelConsumable.revert( modelElement, 'addAttribute:bold' ); // Revert consuming `bold` attribute insert from `modelElement`.\n\t *\t\tmodelConsumable.revert( modelElement, 'removeAttribute:bold' ); // Revert consuming `bold` attribute remove from `modelElement`.\n\t *\t\tmodelConsumable.revert( modelSelection, 'selection' ); // Revert consuming `modelSelection`.\n\t *\t\tmodelConsumable.revert( modelRange, 'range' ); // Revert consuming `modelRange`.\n\t *\n\t * @param {module:engine/model/item~Item|module:engine/model/selection~Selection|module:engine/model/range~Range} item\n\t * Model item, range or selection to be reverted.\n\t * @param {String} type Consumable type.\n\t * @returns {null|Boolean} `true` if consumable has been reversed, `false` otherwise. `null` if the consumable has\n\t * never been added.\n\t */\n\trevert( item, type ) {\n\t\ttype = _normalizeConsumableType( type );\n\n\t\tif ( item instanceof TextProxy ) {\n\t\t\titem = this._getSymbolForTextProxy( item );\n\t\t}\n\n\t\tconst test = this.test( item, type );\n\n\t\tif ( test === false ) {\n\t\t\tthis._consumable.get( item ).set( type, true );\n\n\t\t\treturn true;\n\t\t} else if ( test === true ) {\n\t\t\treturn false;\n\t\t}\n\n\t\treturn null;\n\t}\n\n\t/**\n\t * Gets a unique symbol for passed {@link module:engine/model/textproxy~TextProxy} instance. All `TextProxy` instances that\n\t * have same parent, same start index and same end index will get the same symbol.\n\t *\n\t * Used internally to correctly consume `TextProxy` instances.\n\t *\n\t * @private\n\t * @param {module:engine/model/textproxy~TextProxy} textProxy `TextProxy` instance to get a symbol for.\n\t * @returns {Symbol} Symbol representing all equal instances of `TextProxy`.\n\t */\n\t_getSymbolForTextProxy( textProxy ) {\n\t\tlet symbol = null;\n\n\t\tconst startMap = this._textProxyRegistry.get( textProxy.startOffset );\n\n\t\tif ( startMap ) {\n\t\t\tconst endMap = startMap.get( textProxy.endOffset );\n\n\t\t\tif ( endMap ) {\n\t\t\t\tsymbol = endMap.get( textProxy.parent );\n\t\t\t}\n\t\t}\n\n\t\tif ( !symbol ) {\n\t\t\tsymbol = this._addSymbolForTextProxy( textProxy.startOffset, textProxy.endOffset, textProxy.parent );\n\t\t}\n\n\t\treturn symbol;\n\t}\n\n\t/**\n\t * Adds a symbol for given properties that characterizes a {@link module:engine/model/textproxy~TextProxy} instance.\n\t *\n\t * Used internally to correctly consume `TextProxy` instances.\n\t *\n\t * @private\n\t * @param {Number} startIndex Text proxy start index in it's parent.\n\t * @param {Number} endIndex Text proxy end index in it's parent.\n\t * @param {module:engine/model/element~Element} parent Text proxy parent.\n\t * @returns {Symbol} Symbol generated for given properties.\n\t */\n\t_addSymbolForTextProxy( start, end, parent ) {\n\t\tconst symbol = Symbol( 'textProxySymbol' );\n\t\tlet startMap, endMap;\n\n\t\tstartMap = this._textProxyRegistry.get( start );\n\n\t\tif ( !startMap ) {\n\t\t\tstartMap = new Map();\n\t\t\tthis._textProxyRegistry.set( start, startMap );\n\t\t}\n\n\t\tendMap = startMap.get( end );\n\n\t\tif ( !endMap ) {\n\t\t\tendMap = new Map();\n\t\t\tstartMap.set( end, endMap );\n\t\t}\n\n\t\tendMap.set( parent, symbol );\n\n\t\treturn symbol;\n\t}\n}\n\n// Returns a normalized consumable type name from given string. A normalized consumable type name is a string that has\n// at most one colon, for example: `insert` or `addMarker:highlight`. If string to normalize has more \"parts\" (more colons),\n// the other parts are dropped, for example: `addattribute:bold:$text` -> `addattributes:bold`.\n//\n// @param {String} type Consumable type.\n// @returns {String} Normalized consumable type.\nfunction _normalizeConsumableType( type ) {\n\tconst parts = type.split( ':' );\n\n\treturn parts.length > 1 ? parts[ 0 ] + ':' + parts[ 1 ] : parts[ 0 ];\n}\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module engine/conversion/downcastdispatcher\n */\n\nimport Consumable from './modelconsumable';\nimport Range from '../model/range';\nimport Position, { getNodeAfterPosition, getTextNodeAtPosition } from '../model/position';\n\nimport EmitterMixin from '@ckeditor/ckeditor5-utils/src/emittermixin';\nimport mix from '@ckeditor/ckeditor5-utils/src/mix';\n\n/**\n * The downcast dispatcher is a central point of downcasting (conversion from the model to the view), which is a process of reacting\n * to changes in the model and firing a set of events. Callbacks listening to these events are called converters. The\n * converters' role is to convert the model changes to changes in view (for example, adding view nodes or\n * changing attributes on view elements).\n *\n * During the conversion process, downcast dispatcher fires events basing on the state of the model and prepares\n * data for these events. It is important to understand that the events are connected with the changes done on the model,\n * for example: \"a node has been inserted\" or \"an attribute has changed\". This is in contrary to upcasting (a view-to-model conversion)\n * where you convert the view state (view nodes) to a model tree.\n *\n * The events are prepared basing on a diff created by {@link module:engine/model/differ~Differ Differ}, which buffers them\n * and then passes to the downcast dispatcher as a diff between the old model state and the new model state.\n *\n * Note that because the changes are converted, there is a need to have a mapping between the model structure and the view structure.\n * To map positions and elements during the downcast (a model-to-view conversion), use {@link module:engine/conversion/mapper~Mapper}.\n *\n * Downcast dispatcher fires the following events for model tree changes:\n *\n * * {@link module:engine/conversion/downcastdispatcher~DowncastDispatcher#event:insert `insert`} &ndash;\n * If a range of nodes was inserted to the model tree.\n * * {@link module:engine/conversion/downcastdispatcher~DowncastDispatcher#event:remove `remove`} &ndash;\n * If a range of nodes was removed from the model tree.\n * * {@link module:engine/conversion/downcastdispatcher~DowncastDispatcher#event:attribute `attribute`} &ndash;\n * If an attribute was added, changed or removed from a model node.\n *\n * For {@link module:engine/conversion/downcastdispatcher~DowncastDispatcher#event:insert `insert`}\n * and {@link module:engine/conversion/downcastdispatcher~DowncastDispatcher#event:attribute `attribute`},\n * downcast dispatcher generates {@link module:engine/conversion/modelconsumable~ModelConsumable consumables}.\n * These are used to have control over which changes have already been consumed. It is useful when some converters\n * overwrite others or convert multiple changes (for example, it converts an insertion of an element and also converts that\n * element's attributes during the insertion).\n *\n * Additionally, downcast dispatcher fires events for {@link module:engine/model/markercollection~Marker marker} changes:\n *\n * * {@link module:engine/conversion/downcastdispatcher~DowncastDispatcher#event:addMarker} &ndash; If a marker was added.\n * * {@link module:engine/conversion/downcastdispatcher~DowncastDispatcher#event:removeMarker} &ndash; If a marker was removed.\n *\n * Note that changing a marker is done through removing the marker from the old range and adding it to the new range,\n * so both events are fired.\n *\n * Finally, downcast dispatcher also handles firing events for the {@link module:engine/model/selection model selection}\n * conversion:\n *\n * * {@link module:engine/conversion/downcastdispatcher~DowncastDispatcher#event:selection}\n * &ndash; Converts the selection from the model to the view.\n * * {@link module:engine/conversion/downcastdispatcher~DowncastDispatcher#event:attribute}\n * &ndash; Fired for every selection attribute.\n * * {@link module:engine/conversion/downcastdispatcher~DowncastDispatcher#event:addMarker}\n * &ndash; Fired for every marker that contains a selection.\n *\n * Unlike the model tree and the markers, the events for selection are not fired for changes but for a selection state.\n *\n * When providing custom listeners for a downcast dispatcher, remember to check whether a given change has not been\n * {@link module:engine/conversion/modelconsumable~ModelConsumable#consume consumed} yet.\n *\n * When providing custom listeners for downcast dispatcher, keep in mind that any callback that has\n * {@link module:engine/conversion/modelconsumable~ModelConsumable#consume consumed} a value from a consumable and\n * converted the change should also stop the event (for efficiency purposes).\n *\n * When providing custom listeners for downcast dispatcher, remember to use the provided\n * {@link module:engine/view/downcastwriter~DowncastWriter view downcast writer} to apply changes to the view document.\n *\n * You can read more about conversion in the following guides:\n *\n * * {@glink framework/guides/deep-dive/conversion/conversion-introduction Advanced conversion concepts &mdash; attributes}\n * * {@glink framework/guides/deep-dive/conversion/conversion-extending-output Extending the editor output }\n * * {@glink framework/guides/deep-dive/conversion/custom-element-conversion Custom element conversion}\n *\n * An example of a custom converter for the downcast dispatcher:\n *\n *\t\t// You will convert inserting a \"paragraph\" model element into the model.\n *\t\tdowncastDispatcher.on( 'insert:paragraph', ( evt, data, conversionApi ) => {\n *\t\t\t// Remember to check whether the change has not been consumed yet and consume it.\n *\t\t\tif ( conversionApi.consumable.consume( data.item, 'insert' ) ) {\n *\t\t\t\treturn;\n *\t\t\t}\n *\n *\t\t\t// Translate the position in the model to a position in the view.\n *\t\t\tconst viewPosition = conversionApi.mapper.toViewPosition( data.range.start );\n *\n *\t\t\t// Create a <p> element that will be inserted into the view at the `viewPosition`.\n *\t\t\tconst viewElement = conversionApi.writer.createContainerElement( 'p' );\n *\n *\t\t\t// Bind the newly created view element to the model element so positions will map accordingly in the future.\n *\t\t\tconversionApi.mapper.bindElements( data.item, viewElement );\n *\n *\t\t\t// Add the newly created view element to the view.\n *\t\t\tconversionApi.writer.insert( viewPosition, viewElement );\n *\n *\t\t\t// Remember to stop the event propagation.\n *\t\t\tevt.stop();\n *\t\t} );\n */\nexport default class DowncastDispatcher {\n\t/**\n\t * Creates a downcast dispatcher instance.\n\t *\n\t * @see module:engine/conversion/downcastdispatcher~DowncastConversionApi\n\t * @param {Object} conversionApi Additional properties for an interface that will be passed to events fired\n\t * by the downcast dispatcher.\n\t */\n\tconstructor( conversionApi ) {\n\t\t/**\n\t\t * An interface passed by the dispatcher to the event callbacks.\n\t\t *\n\t\t * @member {module:engine/conversion/downcastdispatcher~DowncastConversionApi}\n\t\t */\n\t\tthis.conversionApi = Object.assign( { dispatcher: this }, conversionApi );\n\n\t\t/**\n\t\t * Maps conversion event names that will trigger element reconversion for a given element name.\n\t\t *\n\t\t * @type {Map<String, String>}\n\t\t * @private\n\t\t */\n\t\tthis._reconversionEventsMapping = new Map();\n\t}\n\n\t/**\n\t * Takes a {@link module:engine/model/differ~Differ model differ} object with buffered changes and fires conversion basing on it.\n\t *\n\t * @param {module:engine/model/differ~Differ} differ The differ object with buffered changes.\n\t * @param {module:engine/model/markercollection~MarkerCollection} markers Markers connected with the converted model.\n\t * @param {module:engine/view/downcastwriter~DowncastWriter} writer The view writer that should be used to modify the view document.\n\t */\n\tconvertChanges( differ, markers, writer ) {\n\t\t// Before the view is updated, remove markers which have changed.\n\t\tfor ( const change of differ.getMarkersToRemove() ) {\n\t\t\tthis.convertMarkerRemove( change.name, change.range, writer );\n\t\t}\n\n\t\tconst changes = this._mapChangesWithAutomaticReconversion( differ );\n\n\t\t// Convert changes that happened on model tree.\n\t\tfor ( const entry of changes ) {\n\t\t\tif ( entry.type === 'insert' ) {\n\t\t\t\tthis.convertInsert( Range._createFromPositionAndShift( entry.position, entry.length ), writer );\n\t\t\t} else if ( entry.type === 'remove' ) {\n\t\t\t\tthis.convertRemove( entry.position, entry.length, entry.name, writer );\n\t\t\t} else if ( entry.type === 'reconvert' ) {\n\t\t\t\tthis.reconvertElement( entry.element, writer );\n\t\t\t} else {\n\t\t\t\t// Defaults to 'attribute' change.\n\t\t\t\tthis.convertAttribute( entry.range, entry.attributeKey, entry.attributeOldValue, entry.attributeNewValue, writer );\n\t\t\t}\n\t\t}\n\n\t\tfor ( const markerName of this.conversionApi.mapper.flushUnboundMarkerNames() ) {\n\t\t\tconst markerRange = markers.get( markerName ).getRange();\n\n\t\t\tthis.convertMarkerRemove( markerName, markerRange, writer );\n\t\t\tthis.convertMarkerAdd( markerName, markerRange, writer );\n\t\t}\n\n\t\t// After the view is updated, convert markers which have changed.\n\t\tfor ( const change of differ.getMarkersToAdd() ) {\n\t\t\tthis.convertMarkerAdd( change.name, change.range, writer );\n\t\t}\n\t}\n\n\t/**\n\t * Starts a conversion of a range insertion.\n\t *\n\t * For each node in the range, {@link #event:insert `insert` event is fired}. For each attribute on each node,\n\t * {@link #event:attribute `attribute` event is fired}.\n\t *\n\t * @fires insert\n\t * @fires attribute\n\t * @param {module:engine/model/range~Range} range The inserted range.\n\t * @param {module:engine/view/downcastwriter~DowncastWriter} writer The view writer that should be used to modify the view document.\n\t */\n\tconvertInsert( range, writer ) {\n\t\tthis.conversionApi.writer = writer;\n\n\t\t// Create a list of things that can be consumed, consisting of nodes and their attributes.\n\t\tthis.conversionApi.consumable = this._createInsertConsumable( range );\n\n\t\t// Fire a separate insert event for each node and text fragment contained in the range.\n\t\tfor ( const data of Array.from( range ).map( walkerValueToEventData ) ) {\n\t\t\tthis._convertInsertWithAttributes( data );\n\t\t}\n\n\t\tthis._clearConversionApi();\n\t}\n\n\t/**\n\t * Fires conversion of a single node removal. Fires {@link #event:remove remove event} with provided data.\n\t *\n\t * @param {module:engine/model/position~Position} position Position from which node was removed.\n\t * @param {Number} length Offset size of removed node.\n\t * @param {String} name Name of removed node.\n\t * @param {module:engine/view/downcastwriter~DowncastWriter} writer View writer that should be used to modify view document.\n\t */\n\tconvertRemove( position, length, name, writer ) {\n\t\tthis.conversionApi.writer = writer;\n\n\t\tthis.fire( 'remove:' + name, { position, length }, this.conversionApi );\n\n\t\tthis._clearConversionApi();\n\t}\n\n\t/**\n\t * Starts a conversion of an attribute change on a given `range`.\n\t *\n\t * For each node in the given `range`, {@link #event:attribute attribute event} is fired with the passed data.\n\t *\n\t * @fires attribute\n\t * @param {module:engine/model/range~Range} range Changed range.\n\t * @param {String} key Key of the attribute that has changed.\n\t * @param {*} oldValue Attribute value before the change or `null` if the attribute has not been set before.\n\t * @param {*} newValue New attribute value or `null` if the attribute has been removed.\n\t * @param {module:engine/view/downcastwriter~DowncastWriter} writer View writer that should be used to modify view document.\n\t */\n\tconvertAttribute( range, key, oldValue, newValue, writer ) {\n\t\tthis.conversionApi.writer = writer;\n\n\t\t// Create a list with attributes to consume.\n\t\tthis.conversionApi.consumable = this._createConsumableForRange( range, `attribute:${ key }` );\n\n\t\t// Create a separate attribute event for each node in the range.\n\t\tfor ( const value of range ) {\n\t\t\tconst item = value.item;\n\t\t\tconst itemRange = Range._createFromPositionAndShift( value.previousPosition, value.length );\n\t\t\tconst data = {\n\t\t\t\titem,\n\t\t\t\trange: itemRange,\n\t\t\t\tattributeKey: key,\n\t\t\t\tattributeOldValue: oldValue,\n\t\t\t\tattributeNewValue: newValue\n\t\t\t};\n\n\t\t\tthis._testAndFire( `attribute:${ key }`, data );\n\t\t}\n\n\t\tthis._clearConversionApi();\n\t}\n\n\t/**\n\t * Starts the reconversion of an element. It will:\n\t *\n\t * * Fire an {@link #event:insert `insert` event} for the element to reconvert.\n\t * * Fire an {@link #event:attribute `attribute` event} for element attributes.\n\t *\n\t * This will not reconvert children of the element if they have existing (already converted) views. For newly inserted child elements\n\t * it will behave the same as {@link #convertInsert}.\n\t *\n\t * Element reconversion is defined by the `triggerBy` configuration for the\n\t * {@link module:engine/conversion/downcasthelpers~DowncastHelpers#elementToElement `elementToElement()`} conversion helper.\n\t *\n\t * @fires insert\n\t * @fires attribute\n\t * @param {module:engine/model/element~Element} element The element to be reconverted.\n\t * @param {module:engine/view/downcastwriter~DowncastWriter} writer The view writer that should be used to modify the view document.\n\t */\n\treconvertElement( element, writer ) {\n\t\tconst elementRange = Range._createOn( element );\n\n\t\tthis.conversionApi.writer = writer;\n\n\t\t// Create a list of things that can be consumed, consisting of nodes and their attributes.\n\t\tthis.conversionApi.consumable = this._createInsertConsumable( elementRange );\n\n\t\tconst mapper = this.conversionApi.mapper;\n\t\tconst currentView = mapper.toViewElement( element );\n\n\t\t// Remove the old view but do not remove mapper mappings - those will be used to revive existing elements.\n\t\twriter.remove( currentView );\n\n\t\t// Convert the element - without converting children.\n\t\tthis._convertInsertWithAttributes( {\n\t\t\titem: element,\n\t\t\trange: elementRange\n\t\t} );\n\n\t\tconst convertedViewElement = mapper.toViewElement( element );\n\n\t\t// Iterate over children of reconverted element in order to...\n\t\tfor ( const value of Range._createIn( element ) ) {\n\t\t\tconst { item } = value;\n\n\t\t\tconst view = elementOrTextProxyToView( item, mapper );\n\n\t\t\t// ...either bring back previously converted view...\n\t\t\tif ( view ) {\n\t\t\t\t// Do not move views that are already in converted element - those might be created by the main element converter in case\n\t\t\t\t// when main element converts also its direct children.\n\t\t\t\tif ( view.root !== convertedViewElement.root ) {\n\t\t\t\t\twriter.move(\n\t\t\t\t\t\twriter.createRangeOn( view ),\n\t\t\t\t\t\tmapper.toViewPosition( Position._createBefore( item ) )\n\t\t\t\t\t);\n\t\t\t\t}\n\t\t\t}\n\t\t\t// ... or by converting newly inserted elements.\n\t\t\telse {\n\t\t\t\tthis._convertInsertWithAttributes( walkerValueToEventData( value ) );\n\t\t\t}\n\t\t}\n\n\t\t// After reconversion is done we can unbind the old view.\n\t\tmapper.unbindViewElement( currentView );\n\n\t\tthis._clearConversionApi();\n\t}\n\n\t/**\n\t * Starts the model selection conversion.\n\t *\n\t * Fires events for a given {@link module:engine/model/selection~Selection selection} to start the selection conversion.\n\t *\n\t * @fires selection\n\t * @fires addMarker\n\t * @fires attribute\n\t * @param {module:engine/model/selection~Selection} selection The selection to convert.\n\t * @param {module:engine/model/markercollection~MarkerCollection} markers Markers connected with the converted model.\n\t * @param {module:engine/view/downcastwriter~DowncastWriter} writer View writer that should be used to modify the view document.\n\t */\n\tconvertSelection( selection, markers, writer ) {\n\t\tconst markersAtSelection = Array.from( markers.getMarkersAtPosition( selection.getFirstPosition() ) );\n\n\t\tthis.conversionApi.writer = writer;\n\t\tthis.conversionApi.consumable = this._createSelectionConsumable( selection, markersAtSelection );\n\n\t\tthis.fire( 'selection', { selection }, this.conversionApi );\n\n\t\tif ( !selection.isCollapsed ) {\n\t\t\treturn;\n\t\t}\n\n\t\tfor ( const marker of markersAtSelection ) {\n\t\t\tconst markerRange = marker.getRange();\n\n\t\t\tif ( !shouldMarkerChangeBeConverted( selection.getFirstPosition(), marker, this.conversionApi.mapper ) ) {\n\t\t\t\tcontinue;\n\t\t\t}\n\n\t\t\tconst data = {\n\t\t\t\titem: selection,\n\t\t\t\tmarkerName: marker.name,\n\t\t\t\tmarkerRange\n\t\t\t};\n\n\t\t\tif ( this.conversionApi.consumable.test( selection, 'addMarker:' + marker.name ) ) {\n\t\t\t\tthis.fire( 'addMarker:' + marker.name, data, this.conversionApi );\n\t\t\t}\n\t\t}\n\n\t\tfor ( const key of selection.getAttributeKeys() ) {\n\t\t\tconst data = {\n\t\t\t\titem: selection,\n\t\t\t\trange: selection.getFirstRange(),\n\t\t\t\tattributeKey: key,\n\t\t\t\tattributeOldValue: null,\n\t\t\t\tattributeNewValue: selection.getAttribute( key )\n\t\t\t};\n\n\t\t\t// Do not fire event if the attribute has been consumed.\n\t\t\tif ( this.conversionApi.consumable.test( selection, 'attribute:' + data.attributeKey ) ) {\n\t\t\t\tthis.fire( 'attribute:' + data.attributeKey + ':$text', data, this.conversionApi );\n\t\t\t}\n\t\t}\n\n\t\tthis._clearConversionApi();\n\t}\n\n\t/**\n\t * Converts the added marker. Fires the {@link #event:addMarker `addMarker`} event for each item\n\t * in the marker's range. If the range is collapsed, a single event is dispatched. See the event description for more details.\n\t *\n\t * @fires addMarker\n\t * @param {String} markerName Marker name.\n\t * @param {module:engine/model/range~Range} markerRange The marker range.\n\t * @param {module:engine/view/downcastwriter~DowncastWriter} writer View writer that should be used to modify the view document.\n\t */\n\tconvertMarkerAdd( markerName, markerRange, writer ) {\n\t\t// Do not convert if range is in graveyard or not in the document (e.g. in DocumentFragment).\n\t\tif ( !markerRange.root.document || markerRange.root.rootName == '$graveyard' ) {\n\t\t\treturn;\n\t\t}\n\n\t\tthis.conversionApi.writer = writer;\n\n\t\t// In markers' case, event name == consumable name.\n\t\tconst eventName = 'addMarker:' + markerName;\n\n\t\t//\n\t\t// First, fire an event for the whole marker.\n\t\t//\n\t\tconst consumable = new Consumable();\n\t\tconsumable.add( markerRange, eventName );\n\n\t\tthis.conversionApi.consumable = consumable;\n\n\t\tthis.fire( eventName, { markerName, markerRange }, this.conversionApi );\n\n\t\t//\n\t\t// Do not fire events for each item inside the range if the range got consumed.\n\t\t//\n\t\tif ( !consumable.test( markerRange, eventName ) ) {\n\t\t\treturn;\n\t\t}\n\n\t\t//\n\t\t// Then, fire an event for each item inside the marker range.\n\t\t//\n\t\tthis.conversionApi.consumable = this._createConsumableForRange( markerRange, eventName );\n\n\t\tfor ( const item of markerRange.getItems() ) {\n\t\t\t// Do not fire event for already consumed items.\n\t\t\tif ( !this.conversionApi.consumable.test( item, eventName ) ) {\n\t\t\t\tcontinue;\n\t\t\t}\n\n\t\t\tconst data = { item, range: Range._createOn( item ), markerName, markerRange };\n\n\t\t\tthis.fire( eventName, data, this.conversionApi );\n\t\t}\n\n\t\tthis._clearConversionApi();\n\t}\n\n\t/**\n\t * Fires the conversion of the marker removal. Fires the {@link #event:removeMarker `removeMarker`} event with the provided data.\n\t *\n\t * @fires removeMarker\n\t * @param {String} markerName Marker name.\n\t * @param {module:engine/model/range~Range} markerRange The marker range.\n\t * @param {module:engine/view/downcastwriter~DowncastWriter} writer View writer that should be used to modify the view document.\n\t */\n\tconvertMarkerRemove( markerName, markerRange, writer ) {\n\t\t// Do not convert if range is in graveyard or not in the document (e.g. in DocumentFragment).\n\t\tif ( !markerRange.root.document || markerRange.root.rootName == '$graveyard' ) {\n\t\t\treturn;\n\t\t}\n\n\t\tthis.conversionApi.writer = writer;\n\n\t\tthis.fire( 'removeMarker:' + markerName, { markerName, markerRange }, this.conversionApi );\n\n\t\tthis._clearConversionApi();\n\t}\n\n\t/**\n\t * Maps the model element \"insert\" reconversion for given event names. The event names must be fully specified:\n\t *\n\t * * For \"attribute\" change event, it should include the main element name, i.e: `'attribute:attributeName:elementName'`.\n\t * * For child node change events, these should use the child event name as well, i.e:\n\t *     * For adding a node: `'insert:childElementName'`.\n\t *     * For removing a node: `'remove:childElementName'`.\n\t *\n\t * **Note**: This method should not be used directly. The reconversion is defined by the `triggerBy()` configuration of the\n\t * `elementToElement()` conversion helper.\n\t *\n\t * @protected\n\t * @param {String} modelName The name of the main model element for which the events will trigger the reconversion.\n\t * @param {String} eventName The name of an event that would trigger conversion for a given model element.\n\t */\n\t_mapReconversionTriggerEvent( modelName, eventName ) {\n\t\tthis._reconversionEventsMapping.set( eventName, modelName );\n\t}\n\n\t/**\n\t * Creates {@link module:engine/conversion/modelconsumable~ModelConsumable} with values to consume from a given range,\n\t * assuming that the range has just been inserted to the model.\n\t *\n\t * @private\n\t * @param {module:engine/model/range~Range} range The inserted range.\n\t * @returns {module:engine/conversion/modelconsumable~ModelConsumable} The values to consume.\n\t */\n\t_createInsertConsumable( range ) {\n\t\tconst consumable = new Consumable();\n\n\t\tfor ( const value of range ) {\n\t\t\tconst item = value.item;\n\n\t\t\tconsumable.add( item, 'insert' );\n\n\t\t\tfor ( const key of item.getAttributeKeys() ) {\n\t\t\t\tconsumable.add( item, 'attribute:' + key );\n\t\t\t}\n\t\t}\n\n\t\treturn consumable;\n\t}\n\n\t/**\n\t * Creates {@link module:engine/conversion/modelconsumable~ModelConsumable} with values to consume for a given range.\n\t *\n\t * @private\n\t * @param {module:engine/model/range~Range} range The affected range.\n\t * @param {String} type Consumable type.\n\t * @returns {module:engine/conversion/modelconsumable~ModelConsumable} The values to consume.\n\t */\n\t_createConsumableForRange( range, type ) {\n\t\tconst consumable = new Consumable();\n\n\t\tfor ( const item of range.getItems() ) {\n\t\t\tconsumable.add( item, type );\n\t\t}\n\n\t\treturn consumable;\n\t}\n\n\t/**\n\t * Creates {@link module:engine/conversion/modelconsumable~ModelConsumable} with selection consumable values.\n\t *\n\t * @private\n\t * @param {module:engine/model/selection~Selection} selection The selection to create the consumable from.\n\t * @param {Iterable.<module:engine/model/markercollection~Marker>} markers Markers that contain the selection.\n\t * @returns {module:engine/conversion/modelconsumable~ModelConsumable} The values to consume.\n\t */\n\t_createSelectionConsumable( selection, markers ) {\n\t\tconst consumable = new Consumable();\n\n\t\tconsumable.add( selection, 'selection' );\n\n\t\tfor ( const marker of markers ) {\n\t\t\tconsumable.add( selection, 'addMarker:' + marker.name );\n\t\t}\n\n\t\tfor ( const key of selection.getAttributeKeys() ) {\n\t\t\tconsumable.add( selection, 'attribute:' + key );\n\t\t}\n\n\t\treturn consumable;\n\t}\n\n\t/**\n\t * Tests passed `consumable` to check whether given event can be fired and if so, fires it.\n\t *\n\t * @private\n\t * @fires insert\n\t * @fires attribute\n\t * @param {String} type Event type.\n\t * @param {Object} data Event data.\n\t */\n\t_testAndFire( type, data ) {\n\t\tif ( !this.conversionApi.consumable.test( data.item, type ) ) {\n\t\t\t// Do not fire event if the item was consumed.\n\t\t\treturn;\n\t\t}\n\n\t\tthis.fire( getEventName( type, data ), data, this.conversionApi );\n\t}\n\n\t/**\n\t * Clears the conversion API object.\n\t *\n\t * @private\n\t */\n\t_clearConversionApi() {\n\t\tdelete this.conversionApi.writer;\n\t\tdelete this.conversionApi.consumable;\n\t}\n\n\t/**\n\t * Internal method for converting element insertion. It will fire events for the inserted element and events for its attributes.\n\t *\n\t * @private\n\t * @fires insert\n\t * @fires attribute\n\t * @param {Object} data Event data.\n\t */\n\t_convertInsertWithAttributes( data ) {\n\t\tthis._testAndFire( 'insert', data );\n\n\t\t// Fire a separate addAttribute event for each attribute that was set on inserted items.\n\t\t// This is important because most attributes converters will listen only to add/change/removeAttribute events.\n\t\t// If we would not add this part, attributes on inserted nodes would not be converted.\n\t\tfor ( const key of data.item.getAttributeKeys() ) {\n\t\t\tdata.attributeKey = key;\n\t\t\tdata.attributeOldValue = null;\n\t\t\tdata.attributeNewValue = data.item.getAttribute( key );\n\n\t\t\tthis._testAndFire( `attribute:${ key }`, data );\n\t\t}\n\t}\n\n\t/**\n\t * Returns differ changes together with added \"reconvert\" type changes for {@link #reconvertElement}. These are defined by\n\t * a the `triggerBy()` configuration for the\n\t * {@link module:engine/conversion/downcasthelpers~DowncastHelpers#elementToElement `elementToElement()`} conversion helper.\n\t *\n\t * This method will remove every mapped insert or remove change with a single \"reconvert\" change.\n\t *\n\t * For instance: Having a `triggerBy()` configuration defined for the `<complex>` element that issues this element reconversion on\n\t * `foo` and `bar` attributes change, and a set of changes for this element:\n\t *\n\t *\t\tconst differChanges = [\n\t *\t\t\t{ type: 'attribute', attributeKey: 'foo', ... },\n\t *\t\t\t{ type: 'attribute', attributeKey: 'bar', ... },\n\t *\t\t\t{ type: 'attribute', attributeKey: 'baz', ... }\n\t *\t\t];\n\t *\n\t * This method will return:\n\t *\n\t *\t\tconst updatedChanges = [\n\t *\t\t\t{ type: 'reconvert', element: complexElementInstance },\n\t *\t\t\t{ type: 'attribute', attributeKey: 'baz', ... }\n\t *\t\t];\n\t *\n\t * In the example above, the `'baz'` attribute change will fire an {@link #event:attribute attribute event}\n\t *\n\t * @param {module:engine/model/differ~Differ} differ The differ object with buffered changes.\n\t * @returns {Array.<Object>} Updated set of changes.\n\t * @private\n\t */\n\t_mapChangesWithAutomaticReconversion( differ ) {\n\t\tconst itemsToReconvert = new Set();\n\t\tconst updated = [];\n\n\t\tfor ( const entry of differ.getChanges() ) {\n\t\t\tconst position = entry.position || entry.range.start;\n\t\t\t// Cached parent - just in case. See https://github.com/ckeditor/ckeditor5/issues/6579.\n\t\t\tconst positionParent = position.parent;\n\t\t\tconst textNode = getTextNodeAtPosition( position, positionParent );\n\n\t\t\t// Reconversion is done only on elements so skip text changes.\n\t\t\tif ( textNode ) {\n\t\t\t\tupdated.push( entry );\n\n\t\t\t\tcontinue;\n\t\t\t}\n\n\t\t\tconst element = entry.type === 'attribute' ? getNodeAfterPosition( position, positionParent, null ) : positionParent;\n\n\t\t\t// Case of text node set directly in root. For now used only in tests but can be possible when enabled in paragraph-like roots.\n\t\t\t// See: https://github.com/ckeditor/ckeditor5/issues/762.\n\t\t\tif ( element.is( '$text' ) ) {\n\t\t\t\tupdated.push( entry );\n\n\t\t\t\tcontinue;\n\t\t\t}\n\n\t\t\tlet eventName;\n\n\t\t\tif ( entry.type === 'attribute' ) {\n\t\t\t\teventName = `attribute:${ entry.attributeKey }:${ element.name }`;\n\t\t\t} else {\n\t\t\t\teventName = `${ entry.type }:${ entry.name }`;\n\t\t\t}\n\n\t\t\tif ( this._isReconvertTriggerEvent( eventName, element.name ) ) {\n\t\t\t\tif ( itemsToReconvert.has( element ) ) {\n\t\t\t\t\t// Element is already reconverted, so skip this change.\n\t\t\t\t\tcontinue;\n\t\t\t\t}\n\n\t\t\t\titemsToReconvert.add( element );\n\n\t\t\t\t// Add special \"reconvert\" change.\n\t\t\t\tupdated.push( { type: 'reconvert', element } );\n\t\t\t} else {\n\t\t\t\tupdated.push( entry );\n\t\t\t}\n\t\t}\n\n\t\treturn updated;\n\t}\n\n\t/**\n\t * Checks if the resulting change should trigger element reconversion.\n\t *\n\t * These are defined by a `triggerBy()` configuration for the\n\t * {@link module:engine/conversion/downcasthelpers~DowncastHelpers#elementToElement `elementToElement()`} conversion helper.\n\t *\n\t * @private\n\t * @param {String} eventName The event name to check.\n\t * @param {String} elementName The element name to check.\n\t * @returns {Boolean}\n\t */\n\t_isReconvertTriggerEvent( eventName, elementName ) {\n\t\treturn this._reconversionEventsMapping.get( eventName ) === elementName;\n\t}\n\n\t/**\n\t * Fired for inserted nodes.\n\t *\n\t * `insert` is a namespace for a class of events. Names of actually called events follow this pattern:\n\t * `insert:name`. `name` is either `'$text'`, when {@link module:engine/model/text~Text a text node} has been inserted,\n\t * or {@link module:engine/model/element~Element#name name} of inserted element.\n\t *\n\t * This way listeners can either listen to a general `insert` event or specific event (for example `insert:paragraph`).\n\t *\n\t * @event insert\n\t * @param {Object} data Additional information about the change.\n\t * @param {module:engine/model/item~Item} data.item Inserted item.\n\t * @param {module:engine/model/range~Range} data.range Range spanning over inserted item.\n\t * @param {module:engine/conversion/downcastdispatcher~DowncastConversionApi} conversionApi Conversion interface\n\t * to be used by callback, passed in `DowncastDispatcher` constructor.\n\t */\n\n\t/**\n\t * Fired for removed nodes.\n\t *\n\t * `remove` is a namespace for a class of events. Names of actually called events follow this pattern:\n\t * `remove:name`. `name` is either `'$text'`, when {@link module:engine/model/text~Text a text node} has been removed,\n\t * or the {@link module:engine/model/element~Element#name name} of removed element.\n\t *\n\t * This way listeners can either listen to a general `remove` event or specific event (for example `remove:paragraph`).\n\t *\n\t * @event remove\n\t * @param {Object} data Additional information about the change.\n\t * @param {module:engine/model/position~Position} data.position Position from which the node has been removed.\n\t * @param {Number} data.length Offset size of the removed node.\n\t * @param {module:engine/conversion/downcastdispatcher~DowncastConversionApi} conversionApi Conversion interface\n\t * to be used by callback, passed in `DowncastDispatcher` constructor.\n\t */\n\n\t/**\n\t * Fired in the following cases:\n\t *\n\t * * when an attribute has been added, changed, or removed from a node,\n\t * * when a node with an attribute is inserted,\n\t * * when collapsed model selection attribute is converted.\n\t *\n\t * `attribute` is a namespace for a class of events. Names of actually called events follow this pattern:\n\t * `attribute:attributeKey:name`. `attributeKey` is the key of added/changed/removed attribute.\n\t * `name` is either `'$text'` if change was on {@link module:engine/model/text~Text a text node},\n\t * or the {@link module:engine/model/element~Element#name name} of element which attribute has changed.\n\t *\n\t * This way listeners can either listen to a general `attribute:bold` event or specific event (for example `attribute:src:image`).\n\t *\n\t * @event attribute\n\t * @param {Object} data Additional information about the change.\n\t * @param {module:engine/model/item~Item|module:engine/model/documentselection~DocumentSelection} data.item Changed item\n\t * or converted selection.\n\t * @param {module:engine/model/range~Range} data.range Range spanning over changed item or selection range.\n\t * @param {String} data.attributeKey Attribute key.\n\t * @param {*} data.attributeOldValue Attribute value before the change. This is `null` when selection attribute is converted.\n\t * @param {*} data.attributeNewValue New attribute value.\n\t * @param {module:engine/conversion/downcastdispatcher~DowncastConversionApi} conversionApi Conversion interface\n\t * to be used by callback, passed in `DowncastDispatcher` constructor.\n\t */\n\n\t/**\n\t * Fired for {@link module:engine/model/selection~Selection selection} changes.\n\t *\n\t * @event selection\n\t * @param {module:engine/model/selection~Selection} selection Selection that is converted.\n\t * @param {module:engine/conversion/downcastdispatcher~DowncastConversionApi} conversionApi Conversion interface\n\t * to be used by callback, passed in `DowncastDispatcher` constructor.\n\t */\n\n\t/**\n\t * Fired when a new marker is added to the model. Also fired when a collapsed model selection that is inside a marker is converted.\n\t *\n\t * `addMarker` is a namespace for a class of events. Names of actually called events follow this pattern:\n\t * `addMarker:markerName`. By specifying certain marker names, you can make the events even more gradual. For example,\n\t * if markers are named `foo:abc`, `foo:bar`, then it is possible to listen to `addMarker:foo` or `addMarker:foo:abc` and\n\t * `addMarker:foo:bar` events.\n\t *\n\t * If the marker range is not collapsed:\n\t *\n\t * * the event is fired for each item in the marker range one by one,\n\t * * `conversionApi.consumable` includes each item of the marker range and the consumable value is same as the event name.\n\t *\n\t * If the marker range is collapsed:\n\t *\n\t * * there is only one event,\n\t * * `conversionApi.consumable` includes marker range with the event name.\n\t *\n\t * If the selection inside a marker is converted:\n\t *\n\t * * there is only one event,\n\t * * `conversionApi.consumable` includes the selection instance with the event name.\n\t *\n\t * @event addMarker\n\t * @param {Object} data Additional information about the change.\n\t * @param {module:engine/model/item~Item|module:engine/model/selection~Selection} data.item Item inside the new marker or\n\t * the selection that is being converted.\n\t * @param {module:engine/model/range~Range} [data.range] Range spanning over converted item. Available only in marker conversion, if\n\t * the marker range was not collapsed.\n\t * @param {module:engine/model/range~Range} data.markerRange Marker range.\n\t * @param {String} data.markerName Marker name.\n\t * @param {module:engine/conversion/downcastdispatcher~DowncastConversionApi} conversionApi Conversion interface\n\t * to be used by callback, passed in `DowncastDispatcher` constructor.\n\t */\n\n\t/**\n\t * Fired when a marker is removed from the model.\n\t *\n\t * `removeMarker` is a namespace for a class of events. Names of actually called events follow this pattern:\n\t * `removeMarker:markerName`. By specifying certain marker names, you can make the events even more gradual. For example,\n\t * if markers are named `foo:abc`, `foo:bar`, then it is possible to listen to `removeMarker:foo` or `removeMarker:foo:abc` and\n\t * `removeMarker:foo:bar` events.\n\t *\n\t * @event removeMarker\n\t * @param {Object} data Additional information about the change.\n\t * @param {module:engine/model/range~Range} data.markerRange Marker range.\n\t * @param {String} data.markerName Marker name.\n\t * @param {module:engine/conversion/downcastdispatcher~DowncastConversionApi} conversionApi Conversion interface\n\t * to be used by callback, passed in `DowncastDispatcher` constructor.\n\t */\n}\n\nmix( DowncastDispatcher, EmitterMixin );\n\n// Helper function, checks whether change of `marker` at `modelPosition` should be converted. Marker changes are not\n// converted if they happen inside an element with custom conversion method.\n//\n// @param {module:engine/model/position~Position} modelPosition\n// @param {module:engine/model/markercollection~Marker} marker\n// @param {module:engine/conversion/mapper~Mapper} mapper\n// @returns {Boolean}\nfunction shouldMarkerChangeBeConverted( modelPosition, marker, mapper ) {\n\tconst range = marker.getRange();\n\tconst ancestors = Array.from( modelPosition.getAncestors() );\n\tancestors.shift(); // Remove root element. It cannot be passed to `model.Range#containsItem`.\n\tancestors.reverse();\n\n\tconst hasCustomHandling = ancestors.some( element => {\n\t\tif ( range.containsItem( element ) ) {\n\t\t\tconst viewElement = mapper.toViewElement( element );\n\n\t\t\treturn !!viewElement.getCustomProperty( 'addHighlight' );\n\t\t}\n\t} );\n\n\treturn !hasCustomHandling;\n}\n\nfunction getEventName( type, data ) {\n\tconst name = data.item.name || '$text';\n\n\treturn `${ type }:${ name }`;\n}\n\nfunction walkerValueToEventData( value ) {\n\tconst item = value.item;\n\tconst itemRange = Range._createFromPositionAndShift( value.previousPosition, value.length );\n\n\treturn {\n\t\titem,\n\t\trange: itemRange\n\t};\n}\n\nfunction elementOrTextProxyToView( item, mapper ) {\n\tif ( item.is( 'textProxy' ) ) {\n\t\tconst mappedPosition = mapper.toViewPosition( Position._createBefore( item ) );\n\t\tconst positionParent = mappedPosition.parent;\n\n\t\treturn positionParent.is( '$text' ) ? positionParent : null;\n\t}\n\n\treturn mapper.toViewElement( item );\n}\n\n/**\n * Conversion interface that is registered for given {@link module:engine/conversion/downcastdispatcher~DowncastDispatcher}\n * and is passed as one of parameters when {@link module:engine/conversion/downcastdispatcher~DowncastDispatcher dispatcher}\n * fires its events.\n *\n * @interface module:engine/conversion/downcastdispatcher~DowncastConversionApi\n */\n\n/**\n * The {@link module:engine/conversion/downcastdispatcher~DowncastDispatcher} instance.\n *\n * @member {module:engine/conversion/downcastdispatcher~DowncastDispatcher} #dispatcher\n */\n\n/**\n * Stores the information about what parts of a processed model item are still waiting to be handled. After a piece of a model item was\n * converted, an appropriate consumable value should be {@link module:engine/conversion/modelconsumable~ModelConsumable#consume consumed}.\n *\n * @member {module:engine/conversion/modelconsumable~ModelConsumable} #consumable\n */\n\n/**\n * The {@link module:engine/conversion/mapper~Mapper} instance.\n *\n * @member {module:engine/conversion/mapper~Mapper} #mapper\n */\n\n/**\n * The {@link module:engine/model/schema~Schema} instance set for the model that is downcast.\n *\n * @member {module:engine/model/schema~Schema} #schema\n */\n\n/**\n * The {@link module:engine/view/downcastwriter~DowncastWriter} instance used to manipulate the data during conversion.\n *\n * @member {module:engine/view/downcastwriter~DowncastWriter} #writer\n */\n\n/**\n * An object with an additional configuration which can be used during the conversion process. Available only for data downcast conversion.\n *\n * @member {Object} #options\n */\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module engine/model/selection\n */\n\nimport Position from './position';\nimport Node from './node';\nimport Range from './range';\nimport EmitterMixin from '@ckeditor/ckeditor5-utils/src/emittermixin';\nimport CKEditorError from '@ckeditor/ckeditor5-utils/src/ckeditorerror';\nimport mix from '@ckeditor/ckeditor5-utils/src/mix';\nimport isIterable from '@ckeditor/ckeditor5-utils/src/isiterable';\n\n/**\n * Selection is a set of {@link module:engine/model/range~Range ranges}. It has a direction specified by its\n * {@link module:engine/model/selection~Selection#anchor anchor} and {@link module:engine/model/selection~Selection#focus focus}\n * (it can be {@link module:engine/model/selection~Selection#isBackward forward or backward}).\n * Additionally, selection may have its own attributes (think – whether text typed in in this selection\n * should have those attributes – e.g. whether you type a bolded text).\n *\n * @mixes module:utils/emittermixin~EmitterMixin\n */\nexport default class Selection {\n\t/**\n\t * Creates a new selection instance based on the given {@link module:engine/model/selection~Selectable selectable}\n\t * or creates an empty selection if no arguments were passed.\n\t *\n\t *\t\t// Creates empty selection without ranges.\n\t *\t\tconst selection = writer.createSelection();\n\t *\n\t *\t\t// Creates selection at the given range.\n\t *\t\tconst range = writer.createRange( start, end );\n\t *\t\tconst selection = writer.createSelection( range );\n\t *\n\t *\t\t// Creates selection at the given ranges\n\t *\t\tconst ranges = [ writer.createRange( start1, end2 ), writer.createRange( star2, end2 ) ];\n\t *\t\tconst selection = writer.createSelection( ranges );\n\t *\n\t *\t\t// Creates selection from the other selection.\n\t *\t\t// Note: It doesn't copies selection attributes.\n\t *\t\tconst otherSelection = writer.createSelection();\n\t *\t\tconst selection = writer.createSelection( otherSelection );\n\t *\n\t *\t\t// Creates selection from the given document selection.\n\t *\t\t// Note: It doesn't copies selection attributes.\n\t *\t\tconst documentSelection = model.document.selection;\n\t *\t\tconst selection = writer.createSelection( documentSelection );\n\t *\n\t *\t\t// Creates selection at the given position.\n\t *\t\tconst position = writer.createPositionFromPath( root, path );\n\t *\t\tconst selection = writer.createSelection( position );\n\t *\n\t *\t\t// Creates selection at the given offset in the given element.\n\t *\t\tconst paragraph = writer.createElement( 'paragraph' );\n\t *\t\tconst selection = writer.createSelection( paragraph, offset );\n\t *\n\t *\t\t// Creates a range inside an {@link module:engine/model/element~Element element} which starts before the\n\t *\t\t// first child of that element and ends after the last child of that element.\n\t *\t\tconst selection = writer.createSelection( paragraph, 'in' );\n\t *\n\t *\t\t// Creates a range on an {@link module:engine/model/item~Item item} which starts before the item and ends\n\t *\t\t// just after the item.\n\t *\t\tconst selection = writer.createSelection( paragraph, 'on' );\n\t *\n\t * Selection's constructor allow passing additional options (`'backward'`) as the last argument.\n\t *\n\t *\t\t// Creates backward selection.\n\t *\t\tconst selection = writer.createSelection( range, { backward: true } );\n\t *\n\t * @param {module:engine/model/selection~Selectable} selectable\n\t * @param {Number|'before'|'end'|'after'|'on'|'in'} [placeOrOffset] Sets place or offset of the selection.\n\t * @param {Object} [options]\n\t * @param {Boolean} [options.backward] Sets this selection instance to be backward.\n\t */\n\tconstructor( selectable, placeOrOffset, options ) {\n\t\t/**\n\t\t * Specifies whether the last added range was added as a backward or forward range.\n\t\t *\n\t\t * @private\n\t\t * @type {Boolean}\n\t\t */\n\t\tthis._lastRangeBackward = false;\n\n\t\t/**\n\t\t * Stores selection ranges.\n\t\t *\n\t\t * @protected\n\t\t * @type {Array.<module:engine/model/range~Range>}\n\t\t */\n\t\tthis._ranges = [];\n\n\t\t/**\n\t\t * List of attributes set on current selection.\n\t\t *\n\t\t * @protected\n\t\t * @type {Map.<String,*>}\n\t\t */\n\t\tthis._attrs = new Map();\n\n\t\tif ( selectable ) {\n\t\t\tthis.setTo( selectable, placeOrOffset, options );\n\t\t}\n\t}\n\n\t/**\n\t * Selection anchor. Anchor is the position from which the selection was started. If a user is making a selection\n\t * by dragging the mouse, the anchor is where the user pressed the mouse button (the beginning of the selection).\n\t *\n\t * Anchor and {@link #focus} define the direction of the selection, which is important\n\t * when expanding/shrinking selection. The focus moves, while the anchor should remain in the same place.\n\t *\n\t * Anchor is always set to the {@link module:engine/model/range~Range#start start} or\n\t * {@link module:engine/model/range~Range#end end} position of the last of selection's ranges. Whether it is\n\t * the `start` or `end` depends on the specified `options.backward`. See the {@link #setTo `setTo()`} method.\n\t *\n\t * May be set to `null` if there are no ranges in the selection.\n\t *\n\t * @see #focus\n\t * @readonly\n\t * @type {module:engine/model/position~Position|null}\n\t */\n\tget anchor() {\n\t\tif ( this._ranges.length > 0 ) {\n\t\t\tconst range = this._ranges[ this._ranges.length - 1 ];\n\n\t\t\treturn this._lastRangeBackward ? range.end : range.start;\n\t\t}\n\n\t\treturn null;\n\t}\n\n\t/**\n\t * Selection focus. Focus is the position where the selection ends. If a user is making a selection\n\t * by dragging the mouse, the focus is where the mouse cursor is.\n\t *\n\t * May be set to `null` if there are no ranges in the selection.\n\t *\n\t * @see #anchor\n\t * @readonly\n\t * @type {module:engine/model/position~Position|null}\n\t */\n\tget focus() {\n\t\tif ( this._ranges.length > 0 ) {\n\t\t\tconst range = this._ranges[ this._ranges.length - 1 ];\n\n\t\t\treturn this._lastRangeBackward ? range.start : range.end;\n\t\t}\n\n\t\treturn null;\n\t}\n\n\t/**\n\t * Whether the selection is collapsed. Selection is collapsed when there is exactly one range in it\n\t * and it is collapsed.\n\t *\n\t * @readonly\n\t * @type {Boolean}\n\t */\n\tget isCollapsed() {\n\t\tconst length = this._ranges.length;\n\n\t\tif ( length === 1 ) {\n\t\t\treturn this._ranges[ 0 ].isCollapsed;\n\t\t} else {\n\t\t\treturn false;\n\t\t}\n\t}\n\n\t/**\n\t * Returns the number of ranges in the selection.\n\t *\n\t * @readonly\n\t * @type {Number}\n\t */\n\tget rangeCount() {\n\t\treturn this._ranges.length;\n\t}\n\n\t/**\n\t * Specifies whether the selection's {@link #focus} precedes the selection's {@link #anchor}.\n\t *\n\t * @readonly\n\t * @type {Boolean}\n\t */\n\tget isBackward() {\n\t\treturn !this.isCollapsed && this._lastRangeBackward;\n\t}\n\n\t/**\n\t * Checks whether this selection is equal to the given selection. Selections are equal if they have the same directions,\n\t * the same number of ranges and all ranges from one selection equal to ranges from the another selection.\n\t *\n\t * @param {module:engine/model/selection~Selection|module:engine/model/documentselection~DocumentSelection} otherSelection\n\t * Selection to compare with.\n\t * @returns {Boolean} `true` if selections are equal, `false` otherwise.\n\t */\n\tisEqual( otherSelection ) {\n\t\tif ( this.rangeCount != otherSelection.rangeCount ) {\n\t\t\treturn false;\n\t\t} else if ( this.rangeCount === 0 ) {\n\t\t\treturn true;\n\t\t}\n\n\t\tif ( !this.anchor.isEqual( otherSelection.anchor ) || !this.focus.isEqual( otherSelection.focus ) ) {\n\t\t\treturn false;\n\t\t}\n\n\t\tfor ( const thisRange of this._ranges ) {\n\t\t\tlet found = false;\n\n\t\t\tfor ( const otherRange of otherSelection._ranges ) {\n\t\t\t\tif ( thisRange.isEqual( otherRange ) ) {\n\t\t\t\t\tfound = true;\n\t\t\t\t\tbreak;\n\t\t\t\t}\n\t\t\t}\n\n\t\t\tif ( !found ) {\n\t\t\t\treturn false;\n\t\t\t}\n\t\t}\n\n\t\treturn true;\n\t}\n\n\t/**\n\t * Returns an iterable object that iterates over copies of selection ranges.\n\t *\n\t * @returns {Iterable.<module:engine/model/range~Range>}\n\t */\n\t* getRanges() {\n\t\tfor ( const range of this._ranges ) {\n\t\t\tyield new Range( range.start, range.end );\n\t\t}\n\t}\n\n\t/**\n\t * Returns a copy of the first range in the selection.\n\t * First range is the one which {@link module:engine/model/range~Range#start start} position\n\t * {@link module:engine/model/position~Position#isBefore is before} start position of all other ranges\n\t * (not to confuse with the first range added to the selection).\n\t *\n\t * Returns `null` if there are no ranges in selection.\n\t *\n\t * @returns {module:engine/model/range~Range|null}\n\t */\n\tgetFirstRange() {\n\t\tlet first = null;\n\n\t\tfor ( const range of this._ranges ) {\n\t\t\tif ( !first || range.start.isBefore( first.start ) ) {\n\t\t\t\tfirst = range;\n\t\t\t}\n\t\t}\n\n\t\treturn first ? new Range( first.start, first.end ) : null;\n\t}\n\n\t/**\n\t * Returns a copy of the last range in the selection.\n\t * Last range is the one which {@link module:engine/model/range~Range#end end} position\n\t * {@link module:engine/model/position~Position#isAfter is after} end position of all other ranges (not to confuse with the range most\n\t * recently added to the selection).\n\t *\n\t * Returns `null` if there are no ranges in selection.\n\t *\n\t * @returns {module:engine/model/range~Range|null}\n\t */\n\tgetLastRange() {\n\t\tlet last = null;\n\n\t\tfor ( const range of this._ranges ) {\n\t\t\tif ( !last || range.end.isAfter( last.end ) ) {\n\t\t\t\tlast = range;\n\t\t\t}\n\t\t}\n\n\t\treturn last ? new Range( last.start, last.end ) : null;\n\t}\n\n\t/**\n\t * Returns the first position in the selection.\n\t * First position is the position that {@link module:engine/model/position~Position#isBefore is before}\n\t * any other position in the selection.\n\t *\n\t * Returns `null` if there are no ranges in selection.\n\t *\n\t * @returns {module:engine/model/position~Position|null}\n\t */\n\tgetFirstPosition() {\n\t\tconst first = this.getFirstRange();\n\n\t\treturn first ? first.start.clone() : null;\n\t}\n\n\t/**\n\t * Returns the last position in the selection.\n\t * Last position is the position that {@link module:engine/model/position~Position#isAfter is after}\n\t * any other position in the selection.\n\t *\n\t * Returns `null` if there are no ranges in selection.\n\t *\n\t * @returns {module:engine/model/position~Position|null}\n\t */\n\tgetLastPosition() {\n\t\tconst lastRange = this.getLastRange();\n\n\t\treturn lastRange ? lastRange.end.clone() : null;\n\t}\n\n\t/**\n\t * Sets this selection's ranges and direction to the specified location based on the given\n\t * {@link module:engine/model/selection~Selectable selectable}.\n\t *\n\t *\t\t// Removes all selection's ranges.\n\t *\t\tselection.setTo( null );\n\t *\n\t *\t\t// Sets selection to the given range.\n\t *\t\tconst range = writer.createRange( start, end );\n\t *\t\tselection.setTo( range );\n\t *\n\t *\t\t// Sets selection to given ranges.\n\t *\t\tconst ranges = [ writer.createRange( start1, end2 ), writer.createRange( star2, end2 ) ];\n\t *\t\tselection.setTo( ranges );\n\t *\n\t *\t\t// Sets selection to other selection.\n\t *\t\t// Note: It doesn't copies selection attributes.\n\t *\t\tconst otherSelection = writer.createSelection();\n\t *\t\tselection.setTo( otherSelection );\n\t *\n\t *\t\t// Sets selection to the given document selection.\n\t *\t\t// Note: It doesn't copies selection attributes.\n\t *\t\tconst documentSelection = new DocumentSelection( doc );\n\t *\t\tselection.setTo( documentSelection );\n\t *\n\t *\t\t// Sets collapsed selection at the given position.\n\t *\t\tconst position = writer.createPositionFromPath( root, path );\n\t *\t\tselection.setTo( position );\n\t *\n\t *\t\t// Sets collapsed selection at the position of the given node and an offset.\n\t *\t\tselection.setTo( paragraph, offset );\n\t *\n\t * Creates a range inside an {@link module:engine/model/element~Element element} which starts before the first child of\n \t * that element and ends after the last child of that element.\n\t *\n\t *\t\tselection.setTo( paragraph, 'in' );\n\t *\n\t * Creates a range on an {@link module:engine/model/item~Item item} which starts before the item and ends just after the item.\n\t *\n\t *\t\tselection.setTo( paragraph, 'on' );\n\t *\n\t * `Selection#setTo()`' method allow passing additional options (`backward`) as the last argument.\n\t *\n\t *\t\t// Sets backward selection.\n\t *\t\tconst selection = writer.createSelection( range, { backward: true } );\n\t *\n\t * @param {module:engine/model/selection~Selectable} selectable\n\t * @param {Number|'before'|'end'|'after'|'on'|'in'} [placeOrOffset] Sets place or offset of the selection.\n\t * @param {Object} [options]\n\t * @param {Boolean} [options.backward] Sets this selection instance to be backward.\n\t */\n\tsetTo( selectable, placeOrOffset, options ) {\n\t\tif ( selectable === null ) {\n\t\t\tthis._setRanges( [] );\n\t\t} else if ( selectable instanceof Selection ) {\n\t\t\tthis._setRanges( selectable.getRanges(), selectable.isBackward );\n\t\t} else if ( selectable && typeof selectable.getRanges == 'function' ) {\n\t\t\t// We assume that the selectable is a DocumentSelection.\n\t\t\t// It can't be imported here, because it would lead to circular imports.\n\t\t\tthis._setRanges( selectable.getRanges(), selectable.isBackward );\n\t\t} else if ( selectable instanceof Range ) {\n\t\t\tthis._setRanges( [ selectable ], !!placeOrOffset && !!placeOrOffset.backward );\n\t\t} else if ( selectable instanceof Position ) {\n\t\t\tthis._setRanges( [ new Range( selectable ) ] );\n\t\t} else if ( selectable instanceof Node ) {\n\t\t\tconst backward = !!options && !!options.backward;\n\t\t\tlet range;\n\n\t\t\tif ( placeOrOffset == 'in' ) {\n\t\t\t\trange = Range._createIn( selectable );\n\t\t\t} else if ( placeOrOffset == 'on' ) {\n\t\t\t\trange = Range._createOn( selectable );\n\t\t\t} else if ( placeOrOffset !== undefined ) {\n\t\t\t\trange = new Range( Position._createAt( selectable, placeOrOffset ) );\n\t\t\t} else {\n\t\t\t\t/**\n\t\t\t\t * selection.setTo requires the second parameter when the first parameter is a node.\n\t\t\t\t *\n\t\t\t\t * @error model-selection-setto-required-second-parameter\n\t\t\t\t */\n\t\t\t\tthrow new CKEditorError( 'model-selection-setto-required-second-parameter', [ this, selectable ] );\n\t\t\t}\n\n\t\t\tthis._setRanges( [ range ], backward );\n\t\t} else if ( isIterable( selectable ) ) {\n\t\t\t// We assume that the selectable is an iterable of ranges.\n\t\t\tthis._setRanges( selectable, placeOrOffset && !!placeOrOffset.backward );\n\t\t} else {\n\t\t\t/**\n\t\t\t * Cannot set the selection to the given place.\n\t\t\t *\n\t\t\t * Invalid parameters were specified when setting the selection. Common issues:\n\t\t\t *\n\t\t\t * * A {@link module:engine/model/textproxy~TextProxy} instance was passed instead of\n\t\t\t * a real {@link module:engine/model/text~Text}.\n\t\t\t * * View nodes were passed instead of model nodes.\n\t\t\t * * `null`/`undefined` was passed.\n\t\t\t *\n\t\t\t * @error model-selection-setto-not-selectable\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'model-selection-setto-not-selectable', [ this, selectable ] );\n\t\t}\n\t}\n\n\t/**\n\t * Replaces all ranges that were added to the selection with given array of ranges. Last range of the array\n\t * is treated like the last added range and is used to set {@link module:engine/model/selection~Selection#anchor} and\n\t * {@link module:engine/model/selection~Selection#focus}. Accepts a flag describing in which direction the selection is made.\n\t *\n\t * @protected\n\t * @fires change:range\n\t * @param {Iterable.<module:engine/model/range~Range>} newRanges Ranges to set.\n\t * @param {Boolean} [isLastBackward=false] Flag describing if last added range was selected forward - from start to end (`false`)\n\t * or backward - from end to start (`true`).\n\t */\n\t_setRanges( newRanges, isLastBackward = false ) {\n\t\tnewRanges = Array.from( newRanges );\n\n\t\t// Check whether there is any range in new ranges set that is different than all already added ranges.\n\t\tconst anyNewRange = newRanges.some( newRange => {\n\t\t\tif ( !( newRange instanceof Range ) ) {\n\t\t\t\t/**\n\t\t\t\t * Selection range set to an object that is not an instance of {@link module:engine/model/range~Range}.\n\t\t\t\t *\n\t\t\t\t * Only {@link module:engine/model/range~Range} instances can be used to set a selection.\n\t\t\t\t * Common mistakes leading to this error are:\n\t\t\t\t *\n\t\t\t\t * * using DOM `Range` object,\n\t\t\t\t * * incorrect CKEditor 5 installation with multiple `ckeditor5-engine` packages having different versions.\n\t\t\t\t *\n\t\t\t\t * @error model-selection-set-ranges-not-range\n\t\t\t\t */\n\t\t\t\tthrow new CKEditorError(\n\t\t\t\t\t'model-selection-set-ranges-not-range',\n\t\t\t\t\t[ this, newRanges ]\n\t\t\t\t);\n\t\t\t}\n\n\t\t\treturn this._ranges.every( oldRange => {\n\t\t\t\treturn !oldRange.isEqual( newRange );\n\t\t\t} );\n\t\t} );\n\n\t\t// Don't do anything if nothing changed.\n\t\tif ( newRanges.length === this._ranges.length && !anyNewRange ) {\n\t\t\treturn;\n\t\t}\n\n\t\tthis._removeAllRanges();\n\n\t\tfor ( const range of newRanges ) {\n\t\t\tthis._pushRange( range );\n\t\t}\n\n\t\tthis._lastRangeBackward = !!isLastBackward;\n\n\t\tthis.fire( 'change:range', { directChange: true } );\n\t}\n\n\t/**\n\t * Moves {@link module:engine/model/selection~Selection#focus} to the specified location.\n\t *\n\t * The location can be specified in the same form as\n\t * {@link module:engine/model/writer~Writer#createPositionAt writer.createPositionAt()} parameters.\n\t *\n\t * @fires change:range\n\t * @param {module:engine/model/item~Item|module:engine/model/position~Position} itemOrPosition\n\t * @param {Number|'end'|'before'|'after'} [offset] Offset or one of the flags. Used only when\n\t * first parameter is a {@link module:engine/model/item~Item model item}.\n\t */\n\tsetFocus( itemOrPosition, offset ) {\n\t\tif ( this.anchor === null ) {\n\t\t\t/**\n\t\t\t * Cannot set selection focus if there are no ranges in selection.\n\t\t\t *\n\t\t\t * @error model-selection-setfocus-no-ranges\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'model-selection-setfocus-no-ranges', [ this, itemOrPosition ] );\n\t\t}\n\n\t\tconst newFocus = Position._createAt( itemOrPosition, offset );\n\n\t\tif ( newFocus.compareWith( this.focus ) == 'same' ) {\n\t\t\treturn;\n\t\t}\n\n\t\tconst anchor = this.anchor;\n\n\t\tif ( this._ranges.length ) {\n\t\t\tthis._popRange();\n\t\t}\n\n\t\tif ( newFocus.compareWith( anchor ) == 'before' ) {\n\t\t\tthis._pushRange( new Range( newFocus, anchor ) );\n\t\t\tthis._lastRangeBackward = true;\n\t\t} else {\n\t\t\tthis._pushRange( new Range( anchor, newFocus ) );\n\t\t\tthis._lastRangeBackward = false;\n\t\t}\n\n\t\tthis.fire( 'change:range', { directChange: true } );\n\t}\n\n\t/**\n\t * Gets an attribute value for given key or `undefined` if that attribute is not set on the selection.\n\t *\n\t * @param {String} key Key of attribute to look for.\n\t * @returns {*} Attribute value or `undefined`.\n\t */\n\tgetAttribute( key ) {\n\t\treturn this._attrs.get( key );\n\t}\n\n\t/**\n\t * Returns iterable that iterates over this selection's attributes.\n\t *\n\t * Attributes are returned as arrays containing two items. First one is attribute key and second is attribute value.\n\t * This format is accepted by native `Map` object and also can be passed in `Node` constructor.\n\t *\n\t * @returns {Iterable.<*>}\n\t */\n\tgetAttributes() {\n\t\treturn this._attrs.entries();\n\t}\n\n\t/**\n\t * Returns iterable that iterates over this selection's attribute keys.\n\t *\n\t * @returns {Iterable.<String>}\n\t */\n\tgetAttributeKeys() {\n\t\treturn this._attrs.keys();\n\t}\n\n\t/**\n\t * Checks if the selection has an attribute for given key.\n\t *\n\t * @param {String} key Key of attribute to check.\n\t * @returns {Boolean} `true` if attribute with given key is set on selection, `false` otherwise.\n\t */\n\thasAttribute( key ) {\n\t\treturn this._attrs.has( key );\n\t}\n\n\t/**\n\t * Removes an attribute with given key from the selection.\n\t *\n\t * If given attribute was set on the selection, fires the {@link #event:change:range} event with\n\t * removed attribute key.\n\t *\n\t * @fires change:attribute\n\t * @param {String} key Key of attribute to remove.\n\t */\n\tremoveAttribute( key ) {\n\t\tif ( this.hasAttribute( key ) ) {\n\t\t\tthis._attrs.delete( key );\n\n\t\t\tthis.fire( 'change:attribute', { attributeKeys: [ key ], directChange: true } );\n\t\t}\n\t}\n\n\t/**\n\t * Sets attribute on the selection. If attribute with the same key already is set, it's value is overwritten.\n\t *\n\t * If the attribute value has changed, fires the {@link #event:change:range} event with\n\t * the attribute key.\n\t *\n\t * @fires change:attribute\n\t * @param {String} key Key of attribute to set.\n\t * @param {*} value Attribute value.\n\t */\n\tsetAttribute( key, value ) {\n\t\tif ( this.getAttribute( key ) !== value ) {\n\t\t\tthis._attrs.set( key, value );\n\n\t\t\tthis.fire( 'change:attribute', { attributeKeys: [ key ], directChange: true } );\n\t\t}\n\t}\n\n\t/**\n\t * Returns the selected element. {@link module:engine/model/element~Element Element} is considered as selected if there is only\n\t * one range in the selection, and that range contains exactly one element.\n\t * Returns `null` if there is no selected element.\n\t *\n\t * @returns {module:engine/model/element~Element|null}\n\t */\n\tgetSelectedElement() {\n\t\tif ( this.rangeCount !== 1 ) {\n\t\t\treturn null;\n\t\t}\n\n\t\treturn this.getFirstRange().getContainedElement();\n\t}\n\n\t/**\n\t * Checks whether this object is of the given.\n\t *\n\t *\t\tselection.is( 'selection' ); // -> true\n\t *\t\tselection.is( 'model:selection' ); // -> true\n\t *\n\t *\t\tselection.is( 'view:selection' ); // -> false\n\t *\t\tselection.is( 'range' ); // -> false\n\t *\n\t * {@link module:engine/model/node~Node#is Check the entire list of model objects} which implement the `is()` method.\n\t *\n\t * @param {String} type\n\t * @returns {Boolean}\n\t */\n\tis( type ) {\n\t\treturn type === 'selection' || type === 'model:selection';\n\t}\n\n\t/**\n\t * Gets elements of type {@link module:engine/model/schema~Schema#isBlock \"block\"} touched by the selection.\n\t *\n\t * This method's result can be used for example to apply block styling to all blocks covered by this selection.\n\t *\n\t * **Note:** `getSelectedBlocks()` returns blocks that are nested in other non-block elements\n\t * but will not return blocks nested in other blocks.\n\t *\n\t * In this case the function will return exactly all 3 paragraphs (note: `<blockQuote>` is not a block itself):\n\t *\n\t *\t\t<paragraph>[a</paragraph>\n\t *\t\t<blockQuote>\n\t *\t\t\t<paragraph>b</paragraph>\n\t *\t\t</blockQuote>\n\t *\t\t<paragraph>c]d</paragraph>\n\t *\n\t * In this case the paragraph will also be returned, despite the collapsed selection:\n\t *\n\t *\t\t<paragraph>[]a</paragraph>\n\t *\n\t * In such a scenario, however, only blocks A, B & E will be returned as blocks C & D are nested in block B:\n\t *\n\t *\t\t[<blockA></blockA>\n\t *\t\t<blockB>\n\t *\t\t\t<blockC></blockC>\n\t *\t\t\t<blockD></blockD>\n\t *\t\t</blockB>\n\t *\t\t<blockE></blockE>]\n\t *\n\t * If the selection is inside a block all the inner blocks (A & B) are returned:\n\t *\n\t * \t\t<block>\n\t *\t\t\t<blockA>[a</blockA>\n\t * \t\t\t<blockB>b]</blockB>\n\t * \t\t</block>\n\t *\n\t * **Special case**: If a selection ends at the beginning of a block, that block is not returned as from user perspective\n\t * this block wasn't selected. See [#984](https://github.com/ckeditor/ckeditor5-engine/issues/984) for more details.\n\t *\n\t *\t\t<paragraph>[a</paragraph>\n\t *\t\t<paragraph>b</paragraph>\n\t *\t\t<paragraph>]c</paragraph> // this block will not be returned\n\t *\n\t * @returns {Iterable.<module:engine/model/element~Element>}\n\t */\n\t* getSelectedBlocks() {\n\t\tconst visited = new WeakSet();\n\n\t\tfor ( const range of this.getRanges() ) {\n\t\t\t// Get start block of range in case of a collapsed range.\n\t\t\tconst startBlock = getParentBlock( range.start, visited );\n\n\t\t\tif ( startBlock && isTopBlockInRange( startBlock, range ) ) {\n\t\t\t\tyield startBlock;\n\t\t\t}\n\n\t\t\tfor ( const value of range.getWalker() ) {\n\t\t\t\tconst block = value.item;\n\n\t\t\t\tif ( value.type == 'elementEnd' && isUnvisitedTopBlock( block, visited, range ) ) {\n\t\t\t\t\tyield block;\n\t\t\t\t}\n\t\t\t}\n\n\t\t\tconst endBlock = getParentBlock( range.end, visited );\n\n\t\t\t// #984. Don't return the end block if the range ends right at its beginning.\n\t\t\tif ( endBlock && !range.end.isTouching( Position._createAt( endBlock, 0 ) ) && isTopBlockInRange( endBlock, range ) ) {\n\t\t\t\tyield endBlock;\n\t\t\t}\n\t\t}\n\t}\n\n\t/**\n\t * Checks whether the selection contains the entire content of the given element. This means that selection must start\n\t * at a position {@link module:engine/model/position~Position#isTouching touching} the element's start and ends at position\n\t * touching the element's end.\n\t *\n\t * By default, this method will check whether the entire content of the selection's current root is selected.\n\t * Useful to check if e.g. the user has just pressed <kbd>Ctrl</kbd> + <kbd>A</kbd>.\n\t *\n\t * @param {module:engine/model/element~Element} [element=this.anchor.root]\n\t * @returns {Boolean}\n\t */\n\tcontainsEntireContent( element = this.anchor.root ) {\n\t\tconst limitStartPosition = Position._createAt( element, 0 );\n\t\tconst limitEndPosition = Position._createAt( element, 'end' );\n\n\t\treturn limitStartPosition.isTouching( this.getFirstPosition() ) &&\n\t\t\tlimitEndPosition.isTouching( this.getLastPosition() );\n\t}\n\n\t/**\n\t * Adds given range to internal {@link #_ranges ranges array}. Throws an error\n\t * if given range is intersecting with any range that is already stored in this selection.\n\t *\n\t * @protected\n\t * @param {module:engine/model/range~Range} range Range to add.\n\t */\n\t_pushRange( range ) {\n\t\tthis._checkRange( range );\n\t\tthis._ranges.push( new Range( range.start, range.end ) );\n\t}\n\n\t/**\n\t * Checks if given range intersects with ranges that are already in the selection. Throws an error if it does.\n\t *\n\t * @protected\n\t * @param {module:engine/model/range~Range} range Range to check.\n\t */\n\t_checkRange( range ) {\n\t\tfor ( let i = 0; i < this._ranges.length; i++ ) {\n\t\t\tif ( range.isIntersecting( this._ranges[ i ] ) ) {\n\t\t\t\t/**\n\t\t\t\t * Trying to add a range that intersects with another range in the selection.\n\t\t\t\t *\n\t\t\t\t * @error model-selection-range-intersects\n\t\t\t\t * @param {module:engine/model/range~Range} addedRange Range that was added to the selection.\n\t\t\t\t * @param {module:engine/model/range~Range} intersectingRange Range in the selection that intersects with `addedRange`.\n\t\t\t\t */\n\t\t\t\tthrow new CKEditorError(\n\t\t\t\t\t'model-selection-range-intersects',\n\t\t\t\t\t[ this, range ],\n\t\t\t\t\t{ addedRange: range, intersectingRange: this._ranges[ i ] }\n\t\t\t\t);\n\t\t\t}\n\t\t}\n\t}\n\n\t/**\n\t * Deletes ranges from internal range array. Uses {@link #_popRange _popRange} to\n\t * ensure proper ranges removal.\n\t *\n\t * @protected\n\t */\n\t_removeAllRanges() {\n\t\twhile ( this._ranges.length > 0 ) {\n\t\t\tthis._popRange();\n\t\t}\n\t}\n\n\t/**\n\t * Removes most recently added range from the selection.\n\t *\n\t * @protected\n\t */\n\t_popRange() {\n\t\tthis._ranges.pop();\n\t}\n\n\t/**\n\t * Fired when selection range(s) changed.\n\t *\n\t * @event change:range\n\t * @param {Boolean} directChange In case of {@link module:engine/model/selection~Selection} class it is always set\n\t * to `true` which indicates that the selection change was caused by a direct use of selection's API.\n\t * The {@link module:engine/model/documentselection~DocumentSelection}, however, may change because its position\n\t * was directly changed through the {@link module:engine/model/writer~Writer writer} or because its position was\n\t * changed because the structure of the model has been changed (which means an indirect change).\n\t * The indirect change does not occur in case of normal (detached) selections because they are \"static\" (as \"not live\")\n\t * which mean that they are not updated once the document changes.\n\t */\n\n\t/**\n\t * Fired when selection attribute changed.\n\t *\n\t * @event change:attribute\n\t * @param {Boolean} directChange In case of {@link module:engine/model/selection~Selection} class it is always set\n\t * to `true` which indicates that the selection change was caused by a direct use of selection's API.\n\t * The {@link module:engine/model/documentselection~DocumentSelection}, however, may change because its attributes\n\t * were directly changed through the {@link module:engine/model/writer~Writer writer} or because its position was\n\t * changed in the model and its attributes were refreshed (which means an indirect change).\n\t * The indirect change does not occur in case of normal (detached) selections because they are \"static\" (as \"not live\")\n\t * which mean that they are not updated once the document changes.\n\t * @param {Array.<String>} attributeKeys Array containing keys of attributes that changed.\n\t */\n}\n\nmix( Selection, EmitterMixin );\n\n// Checks whether the given element extends $block in the schema and has a parent (is not a root).\n// Marks it as already visited.\nfunction isUnvisitedBlock( element, visited ) {\n\tif ( visited.has( element ) ) {\n\t\treturn false;\n\t}\n\n\tvisited.add( element );\n\n\treturn element.root.document.model.schema.isBlock( element ) && element.parent;\n}\n\n// Checks if the given element is a $block was not previously visited and is a top block in a range.\nfunction isUnvisitedTopBlock( element, visited, range ) {\n\treturn isUnvisitedBlock( element, visited ) && isTopBlockInRange( element, range );\n}\n\n// Finds the lowest element in position's ancestors which is a block.\n// It will search until first ancestor that is a limit element.\n// Marks all ancestors as already visited to not include any of them later on.\nfunction getParentBlock( position, visited ) {\n\tconst element = position.parent;\n\tconst schema = element.root.document.model.schema;\n\n\tconst ancestors = position.parent.getAncestors( { parentFirst: true, includeSelf: true } );\n\n\tlet hasParentLimit = false;\n\n\tconst block = ancestors.find( element => {\n\t\t// Stop searching after first parent node that is limit element.\n\t\tif ( hasParentLimit ) {\n\t\t\treturn false;\n\t\t}\n\n\t\thasParentLimit = schema.isLimit( element );\n\n\t\treturn !hasParentLimit && isUnvisitedBlock( element, visited );\n\t} );\n\n\t// Mark all ancestors of this position's parent, because find() might've stopped early and\n\t// the found block may be a child of another block.\n\tancestors.forEach( element => visited.add( element ) );\n\n\treturn block;\n}\n\n// Checks if the blocks is not nested in other block inside a range.\n//\n// @param {module:engine/model/element~Element} block Block to check.\n// @param {module:engine/model/range~Range} range Range to check.\nfunction isTopBlockInRange( block, range ) {\n\tconst parentBlock = findAncestorBlock( block );\n\n\tif ( !parentBlock ) {\n\t\treturn true;\n\t}\n\n\t// Add loose flag to check as parentRange can be equal to range.\n\tconst isParentInRange = range.containsRange( Range._createOn( parentBlock ), true );\n\n\treturn !isParentInRange;\n}\n\n// Returns first ancestor block of a node.\n//\n// @param {module:engine/model/node~Node} node\n// @returns {module:engine/model/node~Node|undefined}\nfunction findAncestorBlock( node ) {\n\tconst schema = node.root.document.model.schema;\n\n\tlet parent = node.parent;\n\n\twhile ( parent ) {\n\t\tif ( schema.isBlock( parent ) ) {\n\t\t\treturn parent;\n\t\t}\n\n\t\tparent = parent.parent;\n\t}\n}\n\n/**\n * An entity that is used to set selection.\n *\n * See also {@link module:engine/model/selection~Selection#setTo}\n *\n * @typedef {\n *     module:engine/model/selection~Selection|\n *     module:engine/model/documentselection~DocumentSelection|\n *     module:engine/model/position~Position|\n *     module:engine/model/range~Range|\n *     module:engine/model/node~Node|\n *     Iterable.<module:engine/model/range~Range>|\n *     null\n * } module:engine/model/selection~Selectable\n */\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module engine/model/liverange\n */\n\nimport Range from './range';\nimport EmitterMixin from '@ckeditor/ckeditor5-utils/src/emittermixin';\nimport mix from '@ckeditor/ckeditor5-utils/src/mix';\n\n/**\n * `LiveRange` is a type of {@link module:engine/model/range~Range Range}\n * that updates itself as {@link module:engine/model/document~Document document}\n * is changed through operations. It may be used as a bookmark.\n *\n * **Note:** Be very careful when dealing with `LiveRange`. Each `LiveRange` instance bind events that might\n * have to be unbound. Use {@link module:engine/model/liverange~LiveRange#detach detach} whenever you don't need `LiveRange` anymore.\n */\nexport default class LiveRange extends Range {\n\t/**\n\t * Creates a live range.\n\t *\n\t * @see module:engine/model/range~Range\n\t */\n\tconstructor( start, end ) {\n\t\tsuper( start, end );\n\n\t\tbindWithDocument.call( this );\n\t}\n\n\t/**\n\t * Unbinds all events previously bound by `LiveRange`. Use it whenever you don't need `LiveRange` instance\n\t * anymore (i.e. when leaving scope in which it was declared or before re-assigning variable that was\n\t * referring to it).\n\t */\n\tdetach() {\n\t\tthis.stopListening();\n\t}\n\n\t/**\n\t * Checks whether this object is of the given.\n\t *\n\t *\t\tliveRange.is( 'range' ); // -> true\n\t *\t\tliveRange.is( 'model:range' ); // -> true\n\t *\t\tliveRange.is( 'liveRange' ); // -> true\n\t *\t\tliveRange.is( 'model:liveRange' ); // -> true\n\t *\n\t *\t\tliveRange.is( 'view:range' ); // -> false\n\t *\t\tliveRange.is( 'documentSelection' ); // -> false\n\t *\n\t * {@link module:engine/model/node~Node#is Check the entire list of model objects} which implement the `is()` method.\n\t *\n\t * @param {String} type\n\t * @returns {Boolean}\n\t */\n\tis( type ) {\n\t\treturn type === 'liveRange' || type === 'model:liveRange' ||\n\t\t\t// From super.is(). This is highly utilised method and cannot call super. See ckeditor/ckeditor5#6529.\n\t\t\ttype == 'range' || type === 'model:range';\n\t}\n\n\t/**\n\t * Creates a {@link module:engine/model/range~Range range instance} that is equal to this live range.\n\t *\n\t * @returns {module:engine/model/range~Range}\n\t */\n\ttoRange() {\n\t\treturn new Range( this.start, this.end );\n\t}\n\n\t/**\n\t * Creates a `LiveRange` instance that is equal to the given range.\n\t *\n\t * @param {module:engine/model/range~Range} range\n\t * @returns {module:engine/model/liverange~LiveRange}\n\t */\n\tstatic fromRange( range ) {\n\t\treturn new LiveRange( range.start, range.end );\n\t}\n\n\t/**\n\t * @see module:engine/model/range~Range._createIn\n\t * @static\n\t * @protected\n\t * @method module:engine/model/liverange~LiveRange._createIn\n\t * @param {module:engine/model/element~Element} element\n\t * @returns {module:engine/model/liverange~LiveRange}\n\t */\n\n\t/**\n\t * @see module:engine/model/range~Range._createOn\n\t * @static\n\t * @protected\n\t * @method module:engine/model/liverange~LiveRange._createOn\n\t * @param {module:engine/model/element~Element} element\n\t * @returns {module:engine/model/liverange~LiveRange}\n\t */\n\n\t/**\n\t * @see module:engine/model/range~Range._createFromPositionAndShift\n\t * @static\n\t * @protected\n\t * @method module:engine/model/liverange~LiveRange._createFromPositionAndShift\n\t * @param {module:engine/model/position~Position} position\n\t * @param {Number} shift\n\t * @returns {module:engine/model/liverange~LiveRange}\n\t */\n\n\t/**\n\t * Fired when `LiveRange` instance boundaries have changed due to changes in the\n\t * {@link module:engine/model/document~Document document}.\n\t *\n\t * @event change:range\n\t * @param {module:engine/model/range~Range} oldRange Range with start and end position equal to start and end position of this live\n\t * range before it got changed.\n\t * @param {Object} data Object with additional information about the change.\n\t * @param {module:engine/model/position~Position|null} data.deletionPosition Source position for remove and merge changes.\n\t * Available if the range was moved to the graveyard root, `null` otherwise.\n\t */\n\n\t/**\n\t * Fired when `LiveRange` instance boundaries have not changed after a change in {@link module:engine/model/document~Document document}\n\t * but the change took place inside the range, effectively changing its content.\n\t *\n\t * @event change:content\n\t * @param {module:engine/model/range~Range} range Range with start and end position equal to start and end position of\n\t * change range.\n\t * @param {Object} data Object with additional information about the change.\n\t * @param {null} data.deletionPosition Due to the nature of this event, this property is always set to `null`. It is passed\n\t * for compatibility with the {@link module:engine/model/liverange~LiveRange#event:change:range} event.\n\t */\n}\n\n// Binds this `LiveRange` to the {@link module:engine/model/document~Document document}\n// that owns this range's {@link module:engine/model/range~Range#root root}.\n//\n// @private\nfunction bindWithDocument() {\n\tthis.listenTo(\n\t\tthis.root.document.model,\n\t\t'applyOperation',\n\t\t( event, args ) => {\n\t\t\tconst operation = args[ 0 ];\n\n\t\t\tif ( !operation.isDocumentOperation ) {\n\t\t\t\treturn;\n\t\t\t}\n\n\t\t\ttransform.call( this, operation );\n\t\t},\n\t\t{ priority: 'low' }\n\t);\n}\n\n// Updates this range accordingly to the updates applied to the model. Bases on change events.\n//\n// @private\n// @param {module:engine/model/operation/operation~Operation} operation Executed operation.\nfunction transform( operation ) {\n\t// Transform the range by the operation. Join the result ranges if needed.\n\tconst ranges = this.getTransformedByOperation( operation );\n\tconst result = Range._createFromRanges( ranges );\n\n\tconst boundariesChanged = !result.isEqual( this );\n\tconst contentChanged = doesOperationChangeRangeContent( this, operation );\n\n\tlet deletionPosition = null;\n\n\tif ( boundariesChanged ) {\n\t\t// If range boundaries have changed, fire `change:range` event.\n\t\t//\n\t\tif ( result.root.rootName == '$graveyard' ) {\n\t\t\t// If the range was moved to the graveyard root, set `deletionPosition`.\n\t\t\tif ( operation.type == 'remove' ) {\n\t\t\t\tdeletionPosition = operation.sourcePosition;\n\t\t\t} else {\n\t\t\t\t// Merge operation.\n\t\t\t\tdeletionPosition = operation.deletionPosition;\n\t\t\t}\n\t\t}\n\n\t\tconst oldRange = this.toRange();\n\n\t\tthis.start = result.start;\n\t\tthis.end = result.end;\n\n\t\tthis.fire( 'change:range', oldRange, { deletionPosition } );\n\t} else if ( contentChanged ) {\n\t\t// If range boundaries have not changed, but there was change inside the range, fire `change:content` event.\n\t\tthis.fire( 'change:content', this.toRange(), { deletionPosition } );\n\t}\n}\n\n// Checks whether given operation changes something inside the range (even if it does not change boundaries).\n//\n// @private\n// @param {module:engine/model/range~Range} range Range to check.\n// @param {module:engine/model/operation/operation~Operation} operation Executed operation.\n// @returns {Boolean}\nfunction doesOperationChangeRangeContent( range, operation ) {\n\tswitch ( operation.type ) {\n\t\tcase 'insert':\n\t\t\treturn range.containsPosition( operation.position );\n\t\tcase 'move':\n\t\tcase 'remove':\n\t\tcase 'reinsert':\n\t\tcase 'merge':\n\t\t\treturn range.containsPosition( operation.sourcePosition ) ||\n\t\t\t\trange.start.isEqual( operation.sourcePosition ) ||\n\t\t\t\trange.containsPosition( operation.targetPosition );\n\t\tcase 'split':\n\t\t\treturn range.containsPosition( operation.splitPosition ) || range.containsPosition( operation.insertionPosition );\n\t}\n\n\treturn false;\n}\n\nmix( LiveRange, EmitterMixin );\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module engine/model/documentselection\n */\n\nimport mix from '@ckeditor/ckeditor5-utils/src/mix';\nimport EmitterMixin from '@ckeditor/ckeditor5-utils/src/emittermixin';\n\nimport Selection from './selection';\nimport LiveRange from './liverange';\nimport Text from './text';\nimport TextProxy from './textproxy';\nimport toMap from '@ckeditor/ckeditor5-utils/src/tomap';\nimport Collection from '@ckeditor/ckeditor5-utils/src/collection';\nimport CKEditorError from '@ckeditor/ckeditor5-utils/src/ckeditorerror';\nimport uid from '@ckeditor/ckeditor5-utils/src/uid';\n\nconst storePrefix = 'selection:';\n\n/**\n * `DocumentSelection` is a special selection which is used as the\n * {@link module:engine/model/document~Document#selection document's selection}.\n * There can be only one instance of `DocumentSelection` per document.\n *\n * Document selection can only be changed by using the {@link module:engine/model/writer~Writer} instance\n * inside the {@link module:engine/model/model~Model#change `change()`} block, as it provides a secure way to modify model.\n *\n * `DocumentSelection` is automatically updated upon changes in the {@link module:engine/model/document~Document document}\n * to always contain valid ranges. Its attributes are inherited from the text unless set explicitly.\n *\n * Differences between {@link module:engine/model/selection~Selection} and `DocumentSelection` are:\n * * there is always a range in `DocumentSelection` - even if no ranges were added there is a \"default range\"\n * present in the selection,\n * * ranges added to this selection updates automatically when the document changes,\n * * attributes of `DocumentSelection` are updated automatically according to selection ranges.\n *\n * Since `DocumentSelection` uses {@link module:engine/model/liverange~LiveRange live ranges}\n * and is updated when {@link module:engine/model/document~Document document}\n * changes, it cannot be set on {@link module:engine/model/node~Node nodes}\n * that are inside {@link module:engine/model/documentfragment~DocumentFragment document fragment}.\n * If you need to represent a selection in document fragment,\n * use {@link module:engine/model/selection~Selection Selection class} instead.\n *\n * @mixes module:utils/emittermixin~EmitterMixin\n */\nexport default class DocumentSelection {\n\t/**\n\t * Creates an empty live selection for given {@link module:engine/model/document~Document}.\n\t *\n\t * @param {module:engine/model/document~Document} doc Document which owns this selection.\n\t */\n\tconstructor( doc ) {\n\t\t/**\n\t\t * Selection used internally by that class (`DocumentSelection` is a proxy to that selection).\n\t\t *\n\t\t * @protected\n\t\t */\n\t\tthis._selection = new LiveSelection( doc );\n\n\t\tthis._selection.delegate( 'change:range' ).to( this );\n\t\tthis._selection.delegate( 'change:attribute' ).to( this );\n\t\tthis._selection.delegate( 'change:marker' ).to( this );\n\t}\n\n\t/**\n\t * Returns whether the selection is collapsed. Selection is collapsed when there is exactly one range which is\n\t * collapsed.\n\t *\n\t * @readonly\n\t * @type {Boolean}\n\t */\n\tget isCollapsed() {\n\t\treturn this._selection.isCollapsed;\n\t}\n\n\t/**\n\t * Selection anchor. Anchor may be described as a position where the most recent part of the selection starts.\n\t * Together with {@link #focus} they define the direction of selection, which is important\n\t * when expanding/shrinking selection. Anchor is always {@link module:engine/model/range~Range#start start} or\n\t * {@link module:engine/model/range~Range#end end} position of the most recently added range.\n\t *\n\t * Is set to `null` if there are no ranges in selection.\n\t *\n\t * @see #focus\n\t * @readonly\n\t * @type {module:engine/model/position~Position|null}\n\t */\n\tget anchor() {\n\t\treturn this._selection.anchor;\n\t}\n\n\t/**\n\t * Selection focus. Focus is a position where the selection ends.\n\t *\n\t * Is set to `null` if there are no ranges in selection.\n\t *\n\t * @see #anchor\n\t * @readonly\n\t * @type {module:engine/model/position~Position|null}\n\t */\n\tget focus() {\n\t\treturn this._selection.focus;\n\t}\n\n\t/**\n\t * Returns number of ranges in selection.\n\t *\n\t * @readonly\n\t * @type {Number}\n\t */\n\tget rangeCount() {\n\t\treturn this._selection.rangeCount;\n\t}\n\n\t/**\n\t * Describes whether `Documentselection` has own range(s) set, or if it is defaulted to\n\t * {@link module:engine/model/document~Document#_getDefaultRange document's default range}.\n\t *\n\t * @readonly\n\t * @type {Boolean}\n\t */\n\tget hasOwnRange() {\n\t\treturn this._selection.hasOwnRange;\n\t}\n\n\t/**\n\t * Specifies whether the {@link #focus}\n\t * precedes {@link #anchor}.\n\t *\n\t * @readonly\n\t * @type {Boolean}\n\t */\n\tget isBackward() {\n\t\treturn this._selection.isBackward;\n\t}\n\n\t/**\n\t * Describes whether the gravity is overridden (using {@link module:engine/model/writer~Writer#overrideSelectionGravity}) or not.\n\t *\n\t * Note that the gravity remains overridden as long as will not be restored the same number of times as it was overridden.\n\t *\n\t * @readonly\n\t * @returns {Boolean}\n\t */\n\tget isGravityOverridden() {\n\t\treturn this._selection.isGravityOverridden;\n\t}\n\n\t/**\n\t * A collection of selection {@link module:engine/model/markercollection~Marker markers}.\n\t * Marker is a selection marker when selection range is inside the marker range.\n\t *\n\t * **Note**: Only markers from {@link ~DocumentSelection#observeMarkers observed markers groups} are collected.\n\t *\n\t * @readonly\n\t * @type {module:utils/collection~Collection}\n\t */\n\tget markers() {\n\t\treturn this._selection.markers;\n\t}\n\n\t/**\n\t * Used for the compatibility with the {@link module:engine/model/selection~Selection#isEqual} method.\n\t *\n\t * @protected\n\t */\n\tget _ranges() {\n\t\treturn this._selection._ranges;\n\t}\n\n\t/**\n\t * Returns an iterable that iterates over copies of selection ranges.\n\t *\n\t * @returns {Iterable.<module:engine/model/range~Range>}\n\t */\n\tgetRanges() {\n\t\treturn this._selection.getRanges();\n\t}\n\n\t/**\n\t * Returns the first position in the selection.\n\t * First position is the position that {@link module:engine/model/position~Position#isBefore is before}\n\t * any other position in the selection.\n\t *\n\t * Returns `null` if there are no ranges in selection.\n\t *\n\t * @returns {module:engine/model/position~Position|null}\n\t */\n\tgetFirstPosition() {\n\t\treturn this._selection.getFirstPosition();\n\t}\n\n\t/**\n\t * Returns the last position in the selection.\n\t * Last position is the position that {@link module:engine/model/position~Position#isAfter is after}\n\t * any other position in the selection.\n\t *\n\t * Returns `null` if there are no ranges in selection.\n\t *\n\t * @returns {module:engine/model/position~Position|null}\n\t */\n\tgetLastPosition() {\n\t\treturn this._selection.getLastPosition();\n\t}\n\n\t/**\n\t * Returns a copy of the first range in the selection.\n\t * First range is the one which {@link module:engine/model/range~Range#start start} position\n\t * {@link module:engine/model/position~Position#isBefore is before} start position of all other ranges\n\t * (not to confuse with the first range added to the selection).\n\t *\n\t * Returns `null` if there are no ranges in selection.\n\t *\n\t * @returns {module:engine/model/range~Range|null}\n\t */\n\tgetFirstRange() {\n\t\treturn this._selection.getFirstRange();\n\t}\n\n\t/**\n\t * Returns a copy of the last range in the selection.\n\t * Last range is the one which {@link module:engine/model/range~Range#end end} position\n\t * {@link module:engine/model/position~Position#isAfter is after} end position of all other ranges (not to confuse with the range most\n\t * recently added to the selection).\n\t *\n\t * Returns `null` if there are no ranges in selection.\n\t *\n\t * @returns {module:engine/model/range~Range|null}\n\t */\n\tgetLastRange() {\n\t\treturn this._selection.getLastRange();\n\t}\n\n\t/**\n\t * Gets elements of type {@link module:engine/model/schema~Schema#isBlock \"block\"} touched by the selection.\n\t *\n\t * This method's result can be used for example to apply block styling to all blocks covered by this selection.\n\t *\n\t * **Note:** `getSelectedBlocks()` returns blocks that are nested in other non-block elements\n\t * but will not return blocks nested in other blocks.\n\t *\n\t * In this case the function will return exactly all 3 paragraphs (note: `<blockQuote>` is not a block itself):\n\t *\n\t *\t\t<paragraph>[a</paragraph>\n\t *\t\t<blockQuote>\n\t *\t\t\t<paragraph>b</paragraph>\n\t *\t\t</blockQuote>\n\t *\t\t<paragraph>c]d</paragraph>\n\t *\n\t * In this case the paragraph will also be returned, despite the collapsed selection:\n\t *\n\t *\t\t<paragraph>[]a</paragraph>\n\t *\n\t * In such a scenario, however, only blocks A, B & E will be returned as blocks C & D are nested in block B:\n\t *\n\t *\t\t[<blockA></blockA>\n\t *\t\t<blockB>\n\t *\t\t\t<blockC></blockC>\n\t *\t\t\t<blockD></blockD>\n\t *\t\t</blockB>\n\t *\t\t<blockE></blockE>]\n\t *\n\t * If the selection is inside a block all the inner blocks (A & B) are returned:\n\t *\n\t * \t\t<block>\n\t *\t\t\t<blockA>[a</blockA>\n\t * \t\t\t<blockB>b]</blockB>\n\t * \t\t</block>\n\t *\n\t * **Special case**: If a selection ends at the beginning of a block, that block is not returned as from user perspective\n\t * this block wasn't selected. See [#984](https://github.com/ckeditor/ckeditor5-engine/issues/984) for more details.\n\t *\n\t *\t\t<paragraph>[a</paragraph>\n\t *\t\t<paragraph>b</paragraph>\n\t *\t\t<paragraph>]c</paragraph> // this block will not be returned\n\t *\n\t * @returns {Iterable.<module:engine/model/element~Element>}\n\t */\n\tgetSelectedBlocks() {\n\t\treturn this._selection.getSelectedBlocks();\n\t}\n\n\t/**\n\t * Returns the selected element. {@link module:engine/model/element~Element Element} is considered as selected if there is only\n\t * one range in the selection, and that range contains exactly one element.\n\t * Returns `null` if there is no selected element.\n\t *\n\t * @returns {module:engine/model/element~Element|null}\n\t */\n\tgetSelectedElement() {\n\t\treturn this._selection.getSelectedElement();\n\t}\n\n\t/**\n\t * Checks whether the selection contains the entire content of the given element. This means that selection must start\n\t * at a position {@link module:engine/model/position~Position#isTouching touching} the element's start and ends at position\n\t * touching the element's end.\n\t *\n\t * By default, this method will check whether the entire content of the selection's current root is selected.\n\t * Useful to check if e.g. the user has just pressed <kbd>Ctrl</kbd> + <kbd>A</kbd>.\n\t *\n\t * @param {module:engine/model/element~Element} [element=this.anchor.root]\n\t * @returns {Boolean}\n\t */\n\tcontainsEntireContent( element ) {\n\t\treturn this._selection.containsEntireContent( element );\n\t}\n\n\t/**\n\t * Unbinds all events previously bound by document selection.\n\t */\n\tdestroy() {\n\t\tthis._selection.destroy();\n\t}\n\n\t/**\n\t * Returns iterable that iterates over this selection's attribute keys.\n\t *\n\t * @returns {Iterable.<String>}\n\t */\n\tgetAttributeKeys() {\n\t\treturn this._selection.getAttributeKeys();\n\t}\n\n\t/**\n\t * Returns iterable that iterates over this selection's attributes.\n\t *\n\t * Attributes are returned as arrays containing two items. First one is attribute key and second is attribute value.\n\t * This format is accepted by native `Map` object and also can be passed in `Node` constructor.\n\t *\n\t * @returns {Iterable.<*>}\n\t */\n\tgetAttributes() {\n\t\treturn this._selection.getAttributes();\n\t}\n\n\t/**\n\t * Gets an attribute value for given key or `undefined` if that attribute is not set on the selection.\n\t *\n\t * @param {String} key Key of attribute to look for.\n\t * @returns {*} Attribute value or `undefined`.\n\t */\n\tgetAttribute( key ) {\n\t\treturn this._selection.getAttribute( key );\n\t}\n\n\t/**\n\t * Checks if the selection has an attribute for given key.\n\t *\n\t * @param {String} key Key of attribute to check.\n\t * @returns {Boolean} `true` if attribute with given key is set on selection, `false` otherwise.\n\t */\n\thasAttribute( key ) {\n\t\treturn this._selection.hasAttribute( key );\n\t}\n\n\t/**\n\t * Refreshes selection attributes and markers according to the current position in the model.\n\t */\n\trefresh() {\n\t\tthis._selection._updateMarkers();\n\t\tthis._selection._updateAttributes( false );\n\t}\n\n\t/**\n\t * Registers marker group prefix or marker name to be collected in {@link ~DocumentSelection#markers selection markers collection}.\n\t *\n\t * See also {@link module:engine/model/markercollection~MarkerCollection#getMarkersGroup `MarkerCollection#getMarkersGroup()`}.\n\t *\n\t * @param {String} prefixOrName Marker group prefix or marker name.\n\t */\n\tobserveMarkers( prefixOrName ) {\n\t\tthis._selection.observeMarkers( prefixOrName );\n\t}\n\n\t/**\n\t * Checks whether this object is of the given type.\n\t *\n\t *\t\tselection.is( 'selection' ); // -> true\n\t *\t\tselection.is( 'documentSelection' ); // -> true\n\t *\t\tselection.is( 'model:selection' ); // -> true\n\t *\t\tselection.is( 'model:documentSelection' ); // -> true\n\t *\n\t *\t\tselection.is( 'view:selection' ); // -> false\n\t *\t\tselection.is( 'element' ); // -> false\n\t *\t\tselection.is( 'node' ); // -> false\n\t *\n\t * {@link module:engine/model/node~Node#is Check the entire list of model objects} which implement the `is()` method.\n\t *\n\t * @param {String} type\n\t * @returns {Boolean}\n\t */\n\tis( type ) {\n\t\treturn type === 'selection' ||\n\t\t\ttype == 'model:selection' ||\n\t\t\ttype == 'documentSelection' ||\n\t\t\ttype == 'model:documentSelection';\n\t}\n\n\t/**\n\t * Moves {@link module:engine/model/documentselection~DocumentSelection#focus} to the specified location.\n\t * Should be used only within the {@link module:engine/model/writer~Writer#setSelectionFocus} method.\n\t *\n\t * The location can be specified in the same form as\n\t * {@link module:engine/model/writer~Writer#createPositionAt writer.createPositionAt()} parameters.\n\t *\n\t * @see module:engine/model/writer~Writer#setSelectionFocus\n\t * @protected\n\t * @param {module:engine/model/item~Item|module:engine/model/position~Position} itemOrPosition\n\t * @param {Number|'end'|'before'|'after'} [offset] Offset or one of the flags. Used only when\n\t * first parameter is a {@link module:engine/model/item~Item model item}.\n\t */\n\t_setFocus( itemOrPosition, offset ) {\n\t\tthis._selection.setFocus( itemOrPosition, offset );\n\t}\n\n\t/**\n\t * Sets this selection's ranges and direction to the specified location based on the given\n\t * {@link module:engine/model/selection~Selectable selectable}.\n\t * Should be used only within the {@link module:engine/model/writer~Writer#setSelection} method.\n\t *\n\t * @see module:engine/model/writer~Writer#setSelection\n\t * @protected\n\t * @param {module:engine/model/selection~Selectable} selectable\n\t * @param {Number|'before'|'end'|'after'|'on'|'in'} [placeOrOffset] Sets place or offset of the selection.\n\t * @param {Object} [options]\n\t * @param {Boolean} [options.backward] Sets this selection instance to be backward.\n\t */\n\t_setTo( selectable, placeOrOffset, options ) {\n\t\tthis._selection.setTo( selectable, placeOrOffset, options );\n\t}\n\n\t/**\n\t * Sets attribute on the selection. If attribute with the same key already is set, it's value is overwritten.\n\t * Should be used only within the {@link module:engine/model/writer~Writer#setSelectionAttribute} method.\n\t *\n\t * @see module:engine/model/writer~Writer#setSelectionAttribute\n\t * @protected\n\t * @param {String} key Key of the attribute to set.\n\t * @param {*} value Attribute value.\n\t */\n\t_setAttribute( key, value ) {\n\t\tthis._selection.setAttribute( key, value );\n\t}\n\n\t/**\n\t * Removes an attribute with given key from the selection.\n\t * If the given attribute was set on the selection, fires the {@link module:engine/model/selection~Selection#event:change:range}\n\t * event with removed attribute key.\n\t * Should be used only within the {@link module:engine/model/writer~Writer#removeSelectionAttribute} method.\n\t *\n\t * @see module:engine/model/writer~Writer#removeSelectionAttribute\n\t * @protected\n\t * @param {String} key Key of the attribute to remove.\n\t */\n\t_removeAttribute( key ) {\n\t\tthis._selection.removeAttribute( key );\n\t}\n\n\t/**\n\t * Returns an iterable that iterates through all selection attributes stored in current selection's parent.\n\t *\n\t * @protected\n\t * @returns {Iterable.<*>}\n\t */\n\t_getStoredAttributes() {\n\t\treturn this._selection._getStoredAttributes();\n\t}\n\n\t/**\n\t * Temporarily changes the gravity of the selection from the left to the right.\n\t *\n\t * The gravity defines from which direction the selection inherits its attributes. If it's the default left\n\t * gravity, the selection (after being moved by the the user) inherits attributes from its left hand side.\n\t * This method allows to temporarily override this behavior by forcing the gravity to the right.\n\t *\n\t * It returns an unique identifier which is required to restore the gravity. It guarantees the symmetry\n\t * of the process.\n\t *\n\t * @see module:engine/model/writer~Writer#overrideSelectionGravity\n\t * @protected\n\t * @returns {String} The unique id which allows restoring the gravity.\n\t */\n\t_overrideGravity() {\n\t\treturn this._selection.overrideGravity();\n\t}\n\n\t/**\n\t * Restores the {@link ~DocumentSelection#_overrideGravity overridden gravity}.\n\t *\n\t * Restoring the gravity is only possible using the unique identifier returned by\n\t * {@link ~DocumentSelection#_overrideGravity}. Note that the gravity remains overridden as long as won't be restored\n\t * the same number of times it was overridden.\n\t *\n\t * @see module:engine/model/writer~Writer#restoreSelectionGravity\n\t * @protected\n\t * @param {String} uid The unique id returned by {@link #_overrideGravity}.\n\t */\n\t_restoreGravity( uid ) {\n\t\tthis._selection.restoreGravity( uid );\n\t}\n\n\t/**\n\t * Generates and returns an attribute key for selection attributes store, basing on original attribute key.\n\t *\n\t * @protected\n\t * @param {String} key Attribute key to convert.\n\t * @returns {String} Converted attribute key, applicable for selection store.\n\t */\n\tstatic _getStoreAttributeKey( key ) {\n\t\treturn storePrefix + key;\n\t}\n\n\t/**\n\t * Checks whether the given attribute key is an attribute stored on an element.\n\t *\n\t * @protected\n\t * @param {String} key\n\t * @returns {Boolean}\n\t */\n\tstatic _isStoreAttributeKey( key ) {\n\t\treturn key.startsWith( storePrefix );\n\t}\n}\n\nmix( DocumentSelection, EmitterMixin );\n\n/**\n * Fired when selection range(s) changed.\n *\n * @event change:range\n * @param {Boolean} directChange In case of {@link module:engine/model/selection~Selection} class it is always set\n * to `true` which indicates that the selection change was caused by a direct use of selection's API.\n * The {@link module:engine/model/documentselection~DocumentSelection}, however, may change because its position\n * was directly changed through the {@link module:engine/model/writer~Writer writer} or because its position was\n * changed because the structure of the model has been changed (which means an indirect change).\n * The indirect change does not occur in case of normal (detached) selections because they are \"static\" (as \"not live\")\n * which mean that they are not updated once the document changes.\n */\n\n/**\n * Fired when selection attribute changed.\n *\n * @event change:attribute\n * @param {Boolean} directChange In case of {@link module:engine/model/selection~Selection} class it is always set\n * to `true` which indicates that the selection change was caused by a direct use of selection's API.\n * The {@link module:engine/model/documentselection~DocumentSelection}, however, may change because its attributes\n * were directly changed through the {@link module:engine/model/writer~Writer writer} or because its position was\n * changed in the model and its attributes were refreshed (which means an indirect change).\n * The indirect change does not occur in case of normal (detached) selections because they are \"static\" (as \"not live\")\n * which mean that they are not updated once the document changes.\n * @param {Array.<String>} attributeKeys Array containing keys of attributes that changed.\n */\n\n/**\n * Fired when selection marker(s) changed.\n *\n * @event change:marker\n * @param {Boolean} directChange This is always set to `false` in case of `change:marker` event as there is no possibility\n * to change markers directly through {@link module:engine/model/documentselection~DocumentSelection} API.\n * See also {@link module:engine/model/documentselection~DocumentSelection#event:change:range} and\n * {@link module:engine/model/documentselection~DocumentSelection#event:change:attribute}.\n * @param {Array.<module:engine/model/markercollection~Marker>} oldMarkers Markers in which the selection was before the change.\n */\n\n// `LiveSelection` is used internally by {@link module:engine/model/documentselection~DocumentSelection} and shouldn't be used directly.\n//\n// LiveSelection` is automatically updated upon changes in the {@link module:engine/model/document~Document document}\n// to always contain valid ranges. Its attributes are inherited from the text unless set explicitly.\n//\n// Differences between {@link module:engine/model/selection~Selection} and `LiveSelection` are:\n// * there is always a range in `LiveSelection` - even if no ranges were added there is a \"default range\"\n// present in the selection,\n// * ranges added to this selection updates automatically when the document changes,\n// * attributes of `LiveSelection` are updated automatically according to selection ranges.\n//\n// @extends module:engine/model/selection~Selection\n//\nclass LiveSelection extends Selection {\n\t// Creates an empty live selection for given {@link module:engine/model/document~Document}.\n\t// @param {module:engine/model/document~Document} doc Document which owns this selection.\n\tconstructor( doc ) {\n\t\tsuper();\n\n\t\t// List of selection markers.\n\t\t// Marker is a selection marker when selection range is inside the marker range.\n\t\t//\n\t\t// @type {module:utils/collection~Collection}\n\t\tthis.markers = new Collection( { idProperty: 'name' } );\n\n\t\t// Document which owns this selection.\n\t\t//\n\t\t// @protected\n\t\t// @member {module:engine/model/model~Model}\n\t\tthis._model = doc.model;\n\n\t\t// Document which owns this selection.\n\t\t//\n\t\t// @protected\n\t\t// @member {module:engine/model/document~Document}\n\t\tthis._document = doc;\n\n\t\t// Keeps mapping of attribute name to priority with which the attribute got modified (added/changed/removed)\n\t\t// last time. Possible values of priority are: `'low'` and `'normal'`.\n\t\t//\n\t\t// Priorities are used by internal `LiveSelection` mechanisms. All attributes set using `LiveSelection`\n\t\t// attributes API are set with `'normal'` priority.\n\t\t//\n\t\t// @private\n\t\t// @member {Map} module:engine/model/liveselection~LiveSelection#_attributePriority\n\t\tthis._attributePriority = new Map();\n\n\t\t// Position to which the selection should be set if the last selection range was moved to the graveyard.\n\t\t// @private\n\t\t// @member {module:engine/model/position~Position} module:engine/model/liveselection~LiveSelection#_selectionRestorePosition\n\t\tthis._selectionRestorePosition = null;\n\n\t\t// Flag that informs whether the selection ranges have changed. It is changed on true when `LiveRange#change:range` event is fired.\n\t\t// @private\n\t\t// @member {Array} module:engine/model/liveselection~LiveSelection#_hasChangedRange\n\t\tthis._hasChangedRange = false;\n\n\t\t// Each overriding gravity adds an UID to the set and each removal removes it.\n\t\t// Gravity is overridden when there's at least one UID in the set.\n\t\t// Gravity is restored when the set is empty.\n\t\t// This is to prevent conflicts when gravity is overridden by more than one feature at the same time.\n\t\t// @private\n\t\t// @type {Set}\n\t\tthis._overriddenGravityRegister = new Set();\n\n\t\t// Prefixes of marker names that should affect `LiveSelection#markers` collection.\n\t\t// @private\n\t\t// @type {Set}\n\t\tthis._observedMarkers = new Set();\n\n\t\t// Ensure selection is correct after each operation.\n\t\tthis.listenTo( this._model, 'applyOperation', ( evt, args ) => {\n\t\t\tconst operation = args[ 0 ];\n\n\t\t\tif ( !operation.isDocumentOperation || operation.type == 'marker' || operation.type == 'rename' || operation.type == 'noop' ) {\n\t\t\t\treturn;\n\t\t\t}\n\n\t\t\t// Fix selection if the last range was removed from it and we have a position to which we can restore the selection.\n\t\t\tif ( this._ranges.length == 0 && this._selectionRestorePosition ) {\n\t\t\t\tthis._fixGraveyardSelection( this._selectionRestorePosition );\n\t\t\t}\n\n\t\t\t// \"Forget\" the restore position even if it was not \"used\".\n\t\t\tthis._selectionRestorePosition = null;\n\n\t\t\tif ( this._hasChangedRange ) {\n\t\t\t\tthis._hasChangedRange = false;\n\t\t\t\tthis.fire( 'change:range', { directChange: false } );\n\t\t\t}\n\t\t}, { priority: 'lowest' } );\n\n\t\t// Ensure selection is correct and up to date after each range change.\n\t\tthis.on( 'change:range', () => {\n\t\t\tfor ( const range of this.getRanges() ) {\n\t\t\t\tif ( !this._document._validateSelectionRange( range ) ) {\n\t\t\t\t\t/**\n\t\t\t\t\t * Range from {@link module:engine/model/documentselection~DocumentSelection document selection}\n\t\t\t\t\t * starts or ends at incorrect position.\n\t\t\t\t\t *\n\t\t\t\t\t * @error document-selection-wrong-position\n\t\t\t\t\t * @param {module:engine/model/range~Range} range\n\t\t\t\t\t */\n\t\t\t\t\tthrow new CKEditorError(\n\t\t\t\t\t\t'document-selection-wrong-position',\n\t\t\t\t\t\tthis,\n\t\t\t\t\t\t{ range }\n\t\t\t\t\t);\n\t\t\t\t}\n\t\t\t}\n\t\t} );\n\n\t\t// Update markers data stored by the selection after each marker change.\n\t\t// This handles only marker changes done through marker operations (not model tree changes).\n\t\tthis.listenTo( this._model.markers, 'update', ( evt, marker, oldRange, newRange ) => {\n\t\t\tthis._updateMarker( marker, newRange );\n\t\t} );\n\n\t\t// Ensure selection is up to date after each change block.\n\t\tthis.listenTo( this._document, 'change', ( evt, batch ) => {\n\t\t\tclearAttributesStoredInElement( this._model, batch );\n\t\t} );\n\t}\n\n\tget isCollapsed() {\n\t\tconst length = this._ranges.length;\n\n\t\treturn length === 0 ? this._document._getDefaultRange().isCollapsed : super.isCollapsed;\n\t}\n\n\tget anchor() {\n\t\treturn super.anchor || this._document._getDefaultRange().start;\n\t}\n\n\tget focus() {\n\t\treturn super.focus || this._document._getDefaultRange().end;\n\t}\n\n\tget rangeCount() {\n\t\treturn this._ranges.length ? this._ranges.length : 1;\n\t}\n\n\t// Describes whether `LiveSelection` has own range(s) set, or if it is defaulted to\n\t// {@link module:engine/model/document~Document#_getDefaultRange document's default range}.\n\t//\n\t// @readonly\n\t// @type {Boolean}\n\tget hasOwnRange() {\n\t\treturn this._ranges.length > 0;\n\t}\n\n\t// When set to `true` then selection attributes on node before the caret won't be taken\n\t// into consideration while updating selection attributes.\n\t//\n\t// @protected\n\t// @type {Boolean}\n\tget isGravityOverridden() {\n\t\treturn !!this._overriddenGravityRegister.size;\n\t}\n\n\t// Unbinds all events previously bound by live selection.\n\tdestroy() {\n\t\tfor ( let i = 0; i < this._ranges.length; i++ ) {\n\t\t\tthis._ranges[ i ].detach();\n\t\t}\n\n\t\tthis.stopListening();\n\t}\n\n\t* getRanges() {\n\t\tif ( this._ranges.length ) {\n\t\t\tyield* super.getRanges();\n\t\t} else {\n\t\t\tyield this._document._getDefaultRange();\n\t\t}\n\t}\n\n\tgetFirstRange() {\n\t\treturn super.getFirstRange() || this._document._getDefaultRange();\n\t}\n\n\tgetLastRange() {\n\t\treturn super.getLastRange() || this._document._getDefaultRange();\n\t}\n\n\tsetTo( selectable, optionsOrPlaceOrOffset, options ) {\n\t\tsuper.setTo( selectable, optionsOrPlaceOrOffset, options );\n\t\tthis._updateAttributes( true );\n\t\tthis._updateMarkers();\n\t}\n\n\tsetFocus( itemOrPosition, offset ) {\n\t\tsuper.setFocus( itemOrPosition, offset );\n\t\tthis._updateAttributes( true );\n\t\tthis._updateMarkers();\n\t}\n\n\tsetAttribute( key, value ) {\n\t\tif ( this._setAttribute( key, value ) ) {\n\t\t\t// Fire event with exact data.\n\t\t\tconst attributeKeys = [ key ];\n\t\t\tthis.fire( 'change:attribute', { attributeKeys, directChange: true } );\n\t\t}\n\t}\n\n\tremoveAttribute( key ) {\n\t\tif ( this._removeAttribute( key ) ) {\n\t\t\t// Fire event with exact data.\n\t\t\tconst attributeKeys = [ key ];\n\t\t\tthis.fire( 'change:attribute', { attributeKeys, directChange: true } );\n\t\t}\n\t}\n\n\toverrideGravity() {\n\t\tconst overrideUid = uid();\n\n\t\t// Remember that another overriding has been requested. It will need to be removed\n\t\t// before the gravity is to be restored.\n\t\tthis._overriddenGravityRegister.add( overrideUid );\n\n\t\tif ( this._overriddenGravityRegister.size === 1 ) {\n\t\t\tthis._updateAttributes( true );\n\t\t}\n\n\t\treturn overrideUid;\n\t}\n\n\trestoreGravity( uid ) {\n\t\tif ( !this._overriddenGravityRegister.has( uid ) ) {\n\t\t\t/**\n\t\t\t * Restoring gravity for an unknown UID is not possible. Make sure you are using a correct\n\t\t\t * UID obtained from the {@link module:engine/model/writer~Writer#overrideSelectionGravity} to restore.\n\t\t\t *\n\t\t\t * @error document-selection-gravity-wrong-restore\n\t\t\t * @param {String} uid The unique identifier returned by\n\t\t\t * {@link module:engine/model/documentselection~DocumentSelection#_overrideGravity}.\n\t\t\t */\n\t\t\tthrow new CKEditorError(\n\t\t\t\t'document-selection-gravity-wrong-restore',\n\t\t\t\tthis,\n\t\t\t\t{ uid }\n\t\t\t);\n\t\t}\n\n\t\tthis._overriddenGravityRegister.delete( uid );\n\n\t\t// Restore gravity only when all overriding have been restored.\n\t\tif ( !this.isGravityOverridden ) {\n\t\t\tthis._updateAttributes( true );\n\t\t}\n\t}\n\n\tobserveMarkers( prefixOrName ) {\n\t\tthis._observedMarkers.add( prefixOrName );\n\t\tthis._updateMarkers();\n\t}\n\n\t_popRange() {\n\t\tthis._ranges.pop().detach();\n\t}\n\n\t_pushRange( range ) {\n\t\tconst liveRange = this._prepareRange( range );\n\n\t\t// `undefined` is returned when given `range` is in graveyard root.\n\t\tif ( liveRange ) {\n\t\t\tthis._ranges.push( liveRange );\n\t\t}\n\t}\n\n\t// Prepares given range to be added to selection. Checks if it is correct,\n\t// converts it to {@link module:engine/model/liverange~LiveRange LiveRange}\n\t// and sets listeners listening to the range's change event.\n\t//\n\t// @private\n\t// @param {module:engine/model/range~Range} range\n\t_prepareRange( range ) {\n\t\tthis._checkRange( range );\n\n\t\tif ( range.root == this._document.graveyard ) {\n\t\t\t// @if CK_DEBUG // console.warn( 'Trying to add a Range that is in the graveyard root. Range rejected.' );\n\n\t\t\treturn;\n\t\t}\n\n\t\tconst liveRange = LiveRange.fromRange( range );\n\n\t\t// If selection range is moved to the graveyard remove it from the selection object.\n\t\t// Also, save some data that can be used to restore selection later, on `Model#applyOperation` event.\n\t\tliveRange.on( 'change:range', ( evt, oldRange, data ) => {\n\t\t\tthis._hasChangedRange = true;\n\n\t\t\tif ( liveRange.root == this._document.graveyard ) {\n\t\t\t\tthis._selectionRestorePosition = data.deletionPosition;\n\n\t\t\t\tconst index = this._ranges.indexOf( liveRange );\n\t\t\t\tthis._ranges.splice( index, 1 );\n\t\t\t\tliveRange.detach();\n\t\t\t}\n\t\t} );\n\n\t\treturn liveRange;\n\t}\n\n\t_updateMarkers() {\n\t\tif ( !this._observedMarkers.size ) {\n\t\t\treturn;\n\t\t}\n\n\t\tconst markers = [];\n\t\tlet changed = false;\n\n\t\tfor ( const marker of this._model.markers ) {\n\t\t\tconst markerGroup = marker.name.split( ':', 1 )[ 0 ];\n\n\t\t\tif ( !this._observedMarkers.has( markerGroup ) ) {\n\t\t\t\tcontinue;\n\t\t\t}\n\n\t\t\tconst markerRange = marker.getRange();\n\n\t\t\tfor ( const selectionRange of this.getRanges() ) {\n\t\t\t\tif ( markerRange.containsRange( selectionRange, !selectionRange.isCollapsed ) ) {\n\t\t\t\t\tmarkers.push( marker );\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\n\t\tconst oldMarkers = Array.from( this.markers );\n\n\t\tfor ( const marker of markers ) {\n\t\t\tif ( !this.markers.has( marker ) ) {\n\t\t\t\tthis.markers.add( marker );\n\n\t\t\t\tchanged = true;\n\t\t\t}\n\t\t}\n\n\t\tfor ( const marker of Array.from( this.markers ) ) {\n\t\t\tif ( !markers.includes( marker ) ) {\n\t\t\t\tthis.markers.remove( marker );\n\n\t\t\t\tchanged = true;\n\t\t\t}\n\t\t}\n\n\t\tif ( changed ) {\n\t\t\tthis.fire( 'change:marker', { oldMarkers, directChange: false } );\n\t\t}\n\t}\n\n\t_updateMarker( marker, markerRange ) {\n\t\tconst markerGroup = marker.name.split( ':', 1 )[ 0 ];\n\n\t\tif ( !this._observedMarkers.has( markerGroup ) ) {\n\t\t\treturn;\n\t\t}\n\n\t\tlet changed = false;\n\n\t\tconst oldMarkers = Array.from( this.markers );\n\t\tconst hasMarker = this.markers.has( marker );\n\n\t\tif ( !markerRange ) {\n\t\t\tif ( hasMarker ) {\n\t\t\t\tthis.markers.remove( marker );\n\t\t\t\tchanged = true;\n\t\t\t}\n\t\t} else {\n\t\t\tlet contained = false;\n\n\t\t\tfor ( const selectionRange of this.getRanges() ) {\n\t\t\t\tif ( markerRange.containsRange( selectionRange, !selectionRange.isCollapsed ) ) {\n\t\t\t\t\tcontained = true;\n\n\t\t\t\t\tbreak;\n\t\t\t\t}\n\t\t\t}\n\n\t\t\tif ( contained && !hasMarker ) {\n\t\t\t\tthis.markers.add( marker );\n\n\t\t\t\tchanged = true;\n\t\t\t} else if ( !contained && hasMarker ) {\n\t\t\t\tthis.markers.remove( marker );\n\n\t\t\t\tchanged = true;\n\t\t\t}\n\t\t}\n\n\t\tif ( changed ) {\n\t\t\tthis.fire( 'change:marker', { oldMarkers, directChange: false } );\n\t\t}\n\t}\n\n\t// Updates this selection attributes according to its ranges and the {@link module:engine/model/document~Document model document}.\n\t//\n\t// @protected\n\t// @param {Boolean} clearAll\n\t// @fires change:attribute\n\t_updateAttributes( clearAll ) {\n\t\tconst newAttributes = toMap( this._getSurroundingAttributes() );\n\t\tconst oldAttributes = toMap( this.getAttributes() );\n\n\t\tif ( clearAll ) {\n\t\t\t// If `clearAll` remove all attributes and reset priorities.\n\t\t\tthis._attributePriority = new Map();\n\t\t\tthis._attrs = new Map();\n\t\t} else {\n\t\t\t// If not, remove only attributes added with `low` priority.\n\t\t\tfor ( const [ key, priority ] of this._attributePriority ) {\n\t\t\t\tif ( priority == 'low' ) {\n\t\t\t\t\tthis._attrs.delete( key );\n\t\t\t\t\tthis._attributePriority.delete( key );\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\n\t\tthis._setAttributesTo( newAttributes );\n\n\t\t// Let's evaluate which attributes really changed.\n\t\tconst changed = [];\n\n\t\t// First, loop through all attributes that are set on selection right now.\n\t\t// Check which of them are different than old attributes.\n\t\tfor ( const [ newKey, newValue ] of this.getAttributes() ) {\n\t\t\tif ( !oldAttributes.has( newKey ) || oldAttributes.get( newKey ) !== newValue ) {\n\t\t\t\tchanged.push( newKey );\n\t\t\t}\n\t\t}\n\n\t\t// Then, check which of old attributes got removed.\n\t\tfor ( const [ oldKey ] of oldAttributes ) {\n\t\t\tif ( !this.hasAttribute( oldKey ) ) {\n\t\t\t\tchanged.push( oldKey );\n\t\t\t}\n\t\t}\n\n\t\t// Fire event with exact data (fire only if anything changed).\n\t\tif ( changed.length > 0 ) {\n\t\t\tthis.fire( 'change:attribute', { attributeKeys: changed, directChange: false } );\n\t\t}\n\t}\n\n\t// Internal method for setting `LiveSelection` attribute. Supports attribute priorities (through `directChange`\n\t// parameter).\n\t//\n\t// @private\n\t// @param {String} key Attribute key.\n\t// @param {*} value Attribute value.\n\t// @param {Boolean} [directChange=true] `true` if the change is caused by `Selection` API, `false` if change\n\t// is caused by `Batch` API.\n\t// @returns {Boolean} Whether value has changed.\n\t_setAttribute( key, value, directChange = true ) {\n\t\tconst priority = directChange ? 'normal' : 'low';\n\n\t\tif ( priority == 'low' && this._attributePriority.get( key ) == 'normal' ) {\n\t\t\t// Priority too low.\n\t\t\treturn false;\n\t\t}\n\n\t\tconst oldValue = super.getAttribute( key );\n\n\t\t// Don't do anything if value has not changed.\n\t\tif ( oldValue === value ) {\n\t\t\treturn false;\n\t\t}\n\n\t\tthis._attrs.set( key, value );\n\n\t\t// Update priorities map.\n\t\tthis._attributePriority.set( key, priority );\n\n\t\treturn true;\n\t}\n\n\t// Internal method for removing `LiveSelection` attribute. Supports attribute priorities (through `directChange`\n\t// parameter).\n\t//\n\t// NOTE: Even if attribute is not present in the selection but is provided to this method, it's priority will\n\t// be changed according to `directChange` parameter.\n\t//\n\t// @private\n\t// @param {String} key Attribute key.\n\t// @param {Boolean} [directChange=true] `true` if the change is caused by `Selection` API, `false` if change\n\t// is caused by `Batch` API.\n\t// @returns {Boolean} Whether attribute was removed. May not be true if such attributes didn't exist or the\n\t// existing attribute had higher priority.\n\t_removeAttribute( key, directChange = true ) {\n\t\tconst priority = directChange ? 'normal' : 'low';\n\n\t\tif ( priority == 'low' && this._attributePriority.get( key ) == 'normal' ) {\n\t\t\t// Priority too low.\n\t\t\treturn false;\n\t\t}\n\n\t\t// Update priorities map.\n\t\tthis._attributePriority.set( key, priority );\n\n\t\t// Don't do anything if value has not changed.\n\t\tif ( !super.hasAttribute( key ) ) {\n\t\t\treturn false;\n\t\t}\n\n\t\tthis._attrs.delete( key );\n\n\t\treturn true;\n\t}\n\n\t// Internal method for setting multiple `LiveSelection` attributes. Supports attribute priorities (through\n\t// `directChange` parameter).\n\t//\n\t// @private\n\t// @param {Map.<String,*>} attrs Iterable object containing attributes to be set.\n\t// @returns {Set.<String>} Changed attribute keys.\n\t_setAttributesTo( attrs ) {\n\t\tconst changed = new Set();\n\n\t\tfor ( const [ oldKey, oldValue ] of this.getAttributes() ) {\n\t\t\t// Do not remove attribute if attribute with same key and value is about to be set.\n\t\t\tif ( attrs.get( oldKey ) === oldValue ) {\n\t\t\t\tcontinue;\n\t\t\t}\n\n\t\t\t// All rest attributes will be removed so changed attributes won't change .\n\t\t\tthis._removeAttribute( oldKey, false );\n\t\t}\n\n\t\tfor ( const [ key, value ] of attrs ) {\n\t\t\t// Attribute may not be set because of attributes or because same key/value is already added.\n\t\t\tconst gotAdded = this._setAttribute( key, value, false );\n\n\t\t\tif ( gotAdded ) {\n\t\t\t\tchanged.add( key );\n\t\t\t}\n\t\t}\n\n\t\treturn changed;\n\t}\n\n\t// Returns an iterable that iterates through all selection attributes stored in current selection's parent.\n\t//\n\t// @protected\n\t// @returns {Iterable.<*>}\n\t* _getStoredAttributes() {\n\t\tconst selectionParent = this.getFirstPosition().parent;\n\n\t\tif ( this.isCollapsed && selectionParent.isEmpty ) {\n\t\t\tfor ( const key of selectionParent.getAttributeKeys() ) {\n\t\t\t\tif ( key.startsWith( storePrefix ) ) {\n\t\t\t\t\tconst realKey = key.substr( storePrefix.length );\n\n\t\t\t\t\tyield [ realKey, selectionParent.getAttribute( key ) ];\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\t}\n\n\t// Checks model text nodes that are closest to the selection's first position and returns attributes of first\n\t// found element. If there are no text nodes in selection's first position parent, it returns selection\n\t// attributes stored in that parent.\n\t//\n\t// @private\n\t// @returns {Iterable.<*>} Collection of attributes.\n\t_getSurroundingAttributes() {\n\t\tconst position = this.getFirstPosition();\n\t\tconst schema = this._model.schema;\n\n\t\tlet attrs = null;\n\n\t\tif ( !this.isCollapsed ) {\n\t\t\t// 1. If selection is a range...\n\t\t\tconst range = this.getFirstRange();\n\n\t\t\t// ...look for a first character node in that range and take attributes from it.\n\t\t\tfor ( const value of range ) {\n\t\t\t\t// If the item is an object, we don't want to get attributes from its children.\n\t\t\t\tif ( value.item.is( 'element' ) && schema.isObject( value.item ) ) {\n\t\t\t\t\tbreak;\n\t\t\t\t}\n\n\t\t\t\tif ( value.type == 'text' ) {\n\t\t\t\t\tattrs = value.item.getAttributes();\n\t\t\t\t\tbreak;\n\t\t\t\t}\n\t\t\t}\n\t\t} else {\n\t\t\t// 2. If the selection is a caret or the range does not contain a character node...\n\n\t\t\tconst nodeBefore = position.textNode ? position.textNode : position.nodeBefore;\n\t\t\tconst nodeAfter = position.textNode ? position.textNode : position.nodeAfter;\n\n\t\t\t// When gravity is overridden then don't take node before into consideration.\n\t\t\tif ( !this.isGravityOverridden ) {\n\t\t\t\t// ...look at the node before caret and take attributes from it if it is a character node.\n\t\t\t\tattrs = getAttrsIfCharacter( nodeBefore );\n\t\t\t}\n\n\t\t\t// 3. If not, look at the node after caret...\n\t\t\tif ( !attrs ) {\n\t\t\t\tattrs = getAttrsIfCharacter( nodeAfter );\n\t\t\t}\n\n\t\t\t// 4. If not, try to find the first character on the left, that is in the same node.\n\t\t\t// When gravity is overridden then don't take node before into consideration.\n\t\t\tif ( !this.isGravityOverridden && !attrs ) {\n\t\t\t\tlet node = nodeBefore;\n\n\t\t\t\twhile ( node && !schema.isInline( node ) && !attrs ) {\n\t\t\t\t\tnode = node.previousSibling;\n\t\t\t\t\tattrs = getAttrsIfCharacter( node );\n\t\t\t\t}\n\t\t\t}\n\n\t\t\t// 5. If not found, try to find the first character on the right, that is in the same node.\n\t\t\tif ( !attrs ) {\n\t\t\t\tlet node = nodeAfter;\n\n\t\t\t\twhile ( node && !schema.isInline( node ) && !attrs ) {\n\t\t\t\t\tnode = node.nextSibling;\n\t\t\t\t\tattrs = getAttrsIfCharacter( node );\n\t\t\t\t}\n\t\t\t}\n\n\t\t\t// 6. If not found, selection should retrieve attributes from parent.\n\t\t\tif ( !attrs ) {\n\t\t\t\tattrs = this._getStoredAttributes();\n\t\t\t}\n\t\t}\n\n\t\treturn attrs;\n\t}\n\n\t// Fixes the selection after all its ranges got removed.\n\t//\n\t// @private\n\t// @param {module:engine/model/position~Position} deletionPosition Position where the deletion happened.\n\t_fixGraveyardSelection( deletionPosition ) {\n\t\t// Find a range that is a correct selection range and is closest to the position where the deletion happened.\n\t\tconst selectionRange = this._model.schema.getNearestSelectionRange( deletionPosition );\n\n\t\t// If nearest valid selection range has been found - add it in the place of old range.\n\t\tif ( selectionRange ) {\n\t\t\t// Check the range, convert it to live range, bind events, etc.\n\t\t\tthis._pushRange( selectionRange );\n\t\t}\n\t\t// If nearest valid selection range cannot be found don't add any range. Selection will be set to the default range.\n\t}\n}\n\n// Helper function for {@link module:engine/model/liveselection~LiveSelection#_updateAttributes}.\n//\n// It takes model item, checks whether it is a text node (or text proxy) and, if so, returns it's attributes. If not, returns `null`.\n//\n// @param {module:engine/model/item~Item|null}  node\n// @returns {Boolean}\nfunction getAttrsIfCharacter( node ) {\n\tif ( node instanceof TextProxy || node instanceof Text ) {\n\t\treturn node.getAttributes();\n\t}\n\n\treturn null;\n}\n\n// Removes selection attributes from element which is not empty anymore.\n//\n// @param {module:engine/model/model~Model} model\n// @param {module:engine/model/batch~Batch} batch\nfunction clearAttributesStoredInElement( model, batch ) {\n\tconst differ = model.document.differ;\n\n\tfor ( const entry of differ.getChanges() ) {\n\t\tif ( entry.type != 'insert' ) {\n\t\t\tcontinue;\n\t\t}\n\n\t\tconst changeParent = entry.position.parent;\n\t\tconst isNoLongerEmpty = entry.length === changeParent.maxOffset;\n\n\t\tif ( isNoLongerEmpty ) {\n\t\t\tmodel.enqueueChange( batch, writer => {\n\t\t\t\tconst storedAttributes = Array.from( changeParent.getAttributeKeys() )\n\t\t\t\t\t.filter( key => key.startsWith( storePrefix ) );\n\n\t\t\t\tfor ( const key of storedAttributes ) {\n\t\t\t\t\twriter.removeAttribute( key, changeParent );\n\t\t\t\t}\n\t\t\t} );\n\t\t}\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module engine/conversion/conversionhelpers\n */\n\n/**\n * Base class for conversion helpers.\n */\nexport default class ConversionHelpers {\n\t/**\n\t * Creates a conversion helpers instance.\n\t *\n\t * @param {Array.<module:engine/conversion/downcastdispatcher~DowncastDispatcher|\n\t * module:engine/conversion/upcastdispatcher~UpcastDispatcher>} dispatchers\n\t */\n\tconstructor( dispatchers ) {\n\t\tthis._dispatchers = dispatchers;\n\t}\n\n\t/**\n\t * Registers a conversion helper.\n\t *\n\t * **Note**: See full usage example in the `{@link module:engine/conversion/conversion~Conversion#for conversion.for()}`\n\t * method description.\n\t *\n\t * @param {Function} conversionHelper The function to be called on event.\n\t * @returns {module:engine/conversion/downcasthelpers~DowncastHelpers|module:engine/conversion/upcasthelpers~UpcastHelpers}\n\t */\n\tadd( conversionHelper ) {\n\t\tfor ( const dispatcher of this._dispatchers ) {\n\t\t\tconversionHelper( dispatcher );\n\t\t}\n\n\t\treturn this;\n\t}\n}\n","import baseClone from './_baseClone.js';\n\n/** Used to compose bitmasks for cloning. */\nvar CLONE_DEEP_FLAG = 1,\n    CLONE_SYMBOLS_FLAG = 4;\n\n/**\n * This method is like `_.clone` except that it recursively clones `value`.\n *\n * @static\n * @memberOf _\n * @since 1.0.0\n * @category Lang\n * @param {*} value The value to recursively clone.\n * @returns {*} Returns the deep cloned value.\n * @see _.clone\n * @example\n *\n * var objects = [{ 'a': 1 }, { 'b': 2 }];\n *\n * var deep = _.cloneDeep(objects);\n * console.log(deep[0] === objects[0]);\n * // => false\n */\nfunction cloneDeep(value) {\n  return baseClone(value, CLONE_DEEP_FLAG | CLONE_SYMBOLS_FLAG);\n}\n\nexport default cloneDeep;\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * Contains downcast (model-to-view) converters for {@link module:engine/conversion/downcastdispatcher~DowncastDispatcher}.\n *\n * @module engine/conversion/downcasthelpers\n */\n\nimport ModelRange from '../model/range';\nimport ModelSelection from '../model/selection';\nimport ModelElement from '../model/element';\n\nimport ViewAttributeElement from '../view/attributeelement';\nimport DocumentSelection from '../model/documentselection';\nimport ConversionHelpers from './conversionhelpers';\n\nimport { cloneDeep } from 'lodash-es';\nimport CKEditorError from '@ckeditor/ckeditor5-utils/src/ckeditorerror';\nimport toArray from '@ckeditor/ckeditor5-utils/src/toarray';\n\n/**\n * Downcast conversion helper functions.\n *\n * @extends module:engine/conversion/conversionhelpers~ConversionHelpers\n */\nexport default class DowncastHelpers extends ConversionHelpers {\n\t/**\n\t * Model element to view element conversion helper.\n\t *\n\t * This conversion results in creating a view element. For example, model `<paragraph>Foo</paragraph>` becomes `<p>Foo</p>` in the view.\n\t *\n\t *\t\teditor.conversion.for( 'downcast' ).elementToElement( {\n\t *\t\t\tmodel: 'paragraph',\n\t *\t\t\tview: 'p'\n\t *\t\t} );\n\t *\n\t *\t\teditor.conversion.for( 'downcast' ).elementToElement( {\n\t *\t\t\tmodel: 'paragraph',\n\t *\t\t\tview: 'div',\n\t *\t\t\tconverterPriority: 'high'\n\t *\t\t} );\n\t *\n\t *\t\teditor.conversion.for( 'downcast' ).elementToElement( {\n\t *\t\t\tmodel: 'fancyParagraph',\n\t *\t\t\tview: {\n\t *\t\t\t\tname: 'p',\n\t *\t\t\t\tclasses: 'fancy'\n\t *\t\t\t}\n\t *\t\t} );\n\t *\n\t *\t\teditor.conversion.for( 'downcast' ).elementToElement( {\n\t *\t\t\tmodel: 'heading',\n\t *\t\t\tview: ( modelElement, conversionApi ) => {\n\t *\t\t\t\tconst { writer } = conversionApi;\n\t *\n\t *\t\t\t\treturn writer.createContainerElement( 'h' + modelElement.getAttribute( 'level' ) );\n\t *\t\t\t}\n\t *\t\t} );\n\t *\n\t * The element-to-element conversion supports the reconversion mechanism. This is helpful in the conversion to complex view structures\n\t * where multiple atomic element-to-element and attribute-to-attribute or attribute-to-element could be used. By specifying\n\t * `triggerBy()` events you can trigger reconverting the model to full view tree structures at once.\n\t *\n\t *\t\teditor.conversion.for( 'downcast' ).elementToElement( {\n\t *\t\t\tmodel: 'complex',\n\t *\t\t\tview: ( modelElement, conversionApi ) => createComplexViewFromModel( modelElement, conversionApi ),\n\t *\t\t\ttriggerBy: {\n\t *\t\t\t\tattributes: [ 'foo', 'bar' ],\n\t *\t\t\t\tchildren: [ 'slot' ]\n\t *\t\t\t}\n\t *\t\t} );\n\t *\n\t * See {@link module:engine/conversion/conversion~Conversion#for `conversion.for()`} to learn how to add a converter\n\t * to the conversion process.\n\t *\n\t * You can read more about element-to-element conversion in the\n\t * {@glink framework/guides/deep-dive/conversion/custom-element-conversion Custom element conversion} guide.\n\t *\n\t * @method #elementToElement\n\t * @param {Object} config Conversion configuration.\n\t * @param {String} config.model The name of the model element to convert.\n\t * @param {module:engine/view/elementdefinition~ElementDefinition|Function} config.view A view element definition or a function\n\t * that takes the model element and {@link module:engine/conversion/downcastdispatcher~DowncastConversionApi downcast conversion API}\n\t * as parameters and returns a view container element.\n\t * @param {Object} [config.triggerBy] Reconversion triggers. At least one trigger must be defined.\n\t * @param {Array.<String>} config.triggerBy.attributes The name of the element's attributes whose change will trigger element\n\t * reconversion.\n\t * @param {Array.<String>} config.triggerBy.children The name of direct children whose adding or removing will trigger element\n\t * reconversion.\n\t * @returns {module:engine/conversion/downcasthelpers~DowncastHelpers}\n\t */\n\telementToElement( config ) {\n\t\treturn this.add( downcastElementToElement( config ) );\n\t}\n\n\t/**\n\t * Model attribute to view element conversion helper.\n\t *\n\t * This conversion results in wrapping view nodes with a view attribute element. For example, a model text node with\n\t * `\"Foo\"` as data and the `bold` attribute becomes `<strong>Foo</strong>` in the view.\n\t *\n\t *\t\teditor.conversion.for( 'downcast' ).attributeToElement( {\n\t *\t\t\tmodel: 'bold',\n\t *\t\t\tview: 'strong'\n\t *\t\t} );\n\t *\n\t *\t\teditor.conversion.for( 'downcast' ).attributeToElement( {\n\t *\t\t\tmodel: 'bold',\n\t *\t\t\tview: 'b',\n\t *\t\t\tconverterPriority: 'high'\n\t *\t\t} );\n\t *\n\t *\t\teditor.conversion.for( 'downcast' ).attributeToElement( {\n\t *\t\t\tmodel: 'invert',\n\t *\t\t\tview: {\n\t *\t\t\t\tname: 'span',\n\t *\t\t\t\tclasses: [ 'font-light', 'bg-dark' ]\n\t *\t\t\t}\n\t *\t\t} );\n\t *\n\t *\t\teditor.conversion.for( 'downcast' ).attributeToElement( {\n\t *\t\t\tmodel: {\n\t *\t\t\t\tkey: 'fontSize',\n\t *\t\t\t\tvalues: [ 'big', 'small' ]\n\t *\t\t\t},\n\t *\t\t\tview: {\n\t *\t\t\t\tbig: {\n\t *\t\t\t\t\tname: 'span',\n\t *\t\t\t\t\tstyles: {\n\t *\t\t\t\t\t\t'font-size': '1.2em'\n\t *\t\t\t\t\t}\n\t *\t\t\t\t},\n\t *\t\t\t\tsmall: {\n\t *\t\t\t\t\tname: 'span',\n\t *\t\t\t\t\tstyles: {\n\t *\t\t\t\t\t\t'font-size': '0.8em'\n\t *\t\t\t\t\t}\n\t *\t\t\t\t}\n\t *\t\t\t}\n\t *\t\t} );\n\t *\n\t *\t\teditor.conversion.for( 'downcast' ).attributeToElement( {\n\t *\t\t\tmodel: 'bold',\n\t *\t\t\tview: ( modelAttributeValue, conversionApi ) => {\n\t *\t\t\t\tconst { writer } = conversionApi;\n\t *\n\t *\t\t\t\treturn writer.createAttributeElement( 'span', {\n\t *\t\t\t\t\tstyle: 'font-weight:' + modelAttributeValue\n\t *\t\t\t\t} );\n\t *\t\t\t}\n\t *\t\t} );\n\t *\n\t *\t\teditor.conversion.for( 'downcast' ).attributeToElement( {\n\t *\t\t\tmodel: {\n\t *\t\t\t\tkey: 'color',\n\t *\t\t\t\tname: '$text'\n\t *\t\t\t},\n\t *\t\t\tview: ( modelAttributeValue, conversionApi ) => {\n\t *\t\t\t\tconst { writer } = conversionApi;\n\t *\n\t *\t\t\t\treturn writer.createAttributeElement( 'span', {\n\t *\t\t\t\t\tstyle: 'color:' + modelAttributeValue\n\t *\t\t\t\t} );\n\t *\t\t\t}\n\t *\t\t} );\n\t *\n\t * See {@link module:engine/conversion/conversion~Conversion#for `conversion.for()`} to learn how to add a converter\n\t * to the conversion process.\n\t *\n\t * @method #attributeToElement\n\t * @param {Object} config Conversion configuration.\n\t * @param {String|Object} config.model The key of the attribute to convert from or a `{ key, values }` object. `values` is an array\n\t * of `String`s with possible values if the model attribute is an enumerable.\n\t * @param {module:engine/view/elementdefinition~ElementDefinition|Function|Object} config.view A view element definition or a function\n\t * that takes the model attribute value and\n\t * {@link module:engine/conversion/downcastdispatcher~DowncastConversionApi downcast conversion API} as parameters and returns a view\n\t * attribute element. If `config.model.values` is given, `config.view` should be an object assigning values from `config.model.values`\n\t * to view element definitions or functions.\n\t * @param {module:utils/priorities~PriorityString} [config.converterPriority='normal'] Converter priority.\n\t * @returns {module:engine/conversion/downcasthelpers~DowncastHelpers}\n\t */\n\tattributeToElement( config ) {\n\t\treturn this.add( downcastAttributeToElement( config ) );\n\t}\n\n\t/**\n\t * Model attribute to view attribute conversion helper.\n\t *\n\t * This conversion results in adding an attribute to a view node, basing on an attribute from a model node. For example,\n\t * `<image src='foo.jpg'></image>` is converted to `<img src='foo.jpg'></img>`.\n\t *\n\t *\t\teditor.conversion.for( 'downcast' ).attributeToAttribute( {\n\t *\t\t\tmodel: 'source',\n\t *\t\t\tview: 'src'\n\t *\t\t} );\n\t *\n\t *\t\teditor.conversion.for( 'downcast' ).attributeToAttribute( {\n\t *\t\t\tmodel: 'source',\n\t *\t\t\tview: 'href',\n\t *\t\t\tconverterPriority: 'high'\n\t *\t\t} );\n\t *\n\t *\t\teditor.conversion.for( 'downcast' ).attributeToAttribute( {\n\t *\t\t\tmodel: {\n\t *\t\t\t\tname: 'image',\n\t *\t\t\t\tkey: 'source'\n\t *\t\t\t},\n\t *\t\t\tview: 'src'\n\t *\t\t} );\n\t *\n\t *\t\teditor.conversion.for( 'downcast' ).attributeToAttribute( {\n\t *\t\t\tmodel: {\n\t *\t\t\t\tname: 'styled',\n\t *\t\t\t\tvalues: [ 'dark', 'light' ]\n\t *\t\t\t},\n\t *\t\t\tview: {\n\t *\t\t\t\tdark: {\n\t *\t\t\t\t\tkey: 'class',\n\t *\t\t\t\t\tvalue: [ 'styled', 'styled-dark' ]\n\t *\t\t\t\t},\n\t *\t\t\t\tlight: {\n\t *\t\t\t\t\tkey: 'class',\n\t *\t\t\t\t\tvalue: [ 'styled', 'styled-light' ]\n\t *\t\t\t\t}\n\t *\t\t\t}\n\t *\t\t} );\n\t *\n\t *\t\teditor.conversion.for( 'downcast' ).attributeToAttribute( {\n\t *\t\t\tmodel: 'styled',\n\t *\t\t\tview: modelAttributeValue => ( {\n\t *\t\t\t\tkey: 'class',\n\t *\t\t\t\tvalue: 'styled-' + modelAttributeValue\n\t *\t\t\t} )\n\t *\t\t} );\n\t *\n\t * **Note**: Downcasting to a style property requires providing `value` as an object:\n\t *\n\t *\t\teditor.conversion.for( 'downcast' ).attributeToAttribute( {\n\t *\t\t\tmodel: 'lineHeight',\n\t *\t\t\tview: modelAttributeValue => ( {\n\t *\t\t\t\tkey: 'style',\n\t *\t\t\t\tvalue: {\n\t *\t\t\t\t\t'line-height': modelAttributeValue,\n\t *\t\t\t\t\t'border-bottom': '1px dotted #ba2'\n\t *\t\t\t\t}\n\t *\t\t\t} )\n\t *\t\t} );\n\t *\n\t * See {@link module:engine/conversion/conversion~Conversion#for `conversion.for()`} to learn how to add a converter\n\t * to the conversion process.\n\t *\n\t * @method #attributeToAttribute\n\t * @param {Object} config Conversion configuration.\n\t * @param {String|Object} config.model The key of the attribute to convert from or a `{ key, values, [ name ] }` object describing\n\t * the attribute key, possible values and, optionally, an element name to convert from.\n\t * @param {String|Object|Function} config.view A view attribute key, or a `{ key, value }` object or a function that takes\n\t * the model attribute value and {@link module:engine/conversion/downcastdispatcher~DowncastConversionApi downcast conversion API}\n\t * as parameters and returns a `{ key, value }` object. If `key` is `'class'`, `value` can be a `String` or an\n\t * array of `String`s. If `key` is `'style'`, `value` is an object with key-value pairs. In other cases, `value` is a `String`.\n\t * If `config.model.values` is set, `config.view` should be an object assigning values from `config.model.values` to\n\t * `{ key, value }` objects or a functions.\n\t * @param {module:utils/priorities~PriorityString} [config.converterPriority='normal'] Converter priority.\n\t * @returns {module:engine/conversion/downcasthelpers~DowncastHelpers}\n\t */\n\tattributeToAttribute( config ) {\n\t\treturn this.add( downcastAttributeToAttribute( config ) );\n\t}\n\n\t/**\n\t * Model marker to view element conversion helper.\n\t *\n\t * **Note**: This method should be used only for editing downcast. For data downcast, use\n\t * {@link #markerToData `#markerToData()`} that produces valid HTML data.\n\t *\n\t * This conversion results in creating a view element on the boundaries of the converted marker. If the converted marker\n\t * is collapsed, only one element is created. For example, model marker set like this: `<paragraph>F[oo b]ar</paragraph>`\n\t * becomes `<p>F<span data-marker=\"search\"></span>oo b<span data-marker=\"search\"></span>ar</p>` in the view.\n\t *\n\t *\t\teditor.conversion.for( 'editingDowncast' ).markerToElement( {\n\t *\t\t\tmodel: 'search',\n\t *\t\t\tview: 'marker-search'\n\t *\t\t} );\n\t *\n\t *\t\teditor.conversion.for( 'editingDowncast' ).markerToElement( {\n\t *\t\t\tmodel: 'search',\n\t *\t\t\tview: 'search-result',\n\t *\t\t\tconverterPriority: 'high'\n\t *\t\t} );\n\t *\n\t *\t\teditor.conversion.for( 'editingDowncast' ).markerToElement( {\n\t *\t\t\tmodel: 'search',\n\t *\t\t\tview: {\n\t *\t\t\t\tname: 'span',\n\t *\t\t\t\tattributes: {\n\t *\t\t\t\t\t'data-marker': 'search'\n\t *\t\t\t\t}\n\t *\t\t\t}\n\t *\t\t} );\n\t *\n\t *\t\teditor.conversion.for( 'editingDowncast' ).markerToElement( {\n\t *\t\t\tmodel: 'search',\n\t *\t\t\tview: ( markerData, conversionApi ) => {\n\t *\t\t\t\tconst { writer } = conversionApi;\n\t *\n\t *\t\t\t\treturn writer.createUIElement( 'span', {\n\t *\t\t\t\t\t'data-marker': 'search',\n\t *\t\t\t\t\t'data-start': markerData.isOpening\n\t *\t\t\t\t} );\n\t *\t\t\t}\n\t *\t\t} );\n\t *\n\t * If a function is passed as the `config.view` parameter, it will be used to generate both boundary elements. The function\n\t * receives the `data` object and {@link module:engine/conversion/downcastdispatcher~DowncastConversionApi downcast conversion API}\n\t * as a parameters and should return an instance of the\n\t * {@link module:engine/view/uielement~UIElement view UI element}. The `data` object and\n\t * {@link module:engine/conversion/downcastdispatcher~DowncastConversionApi `conversionApi`} are passed from\n\t * {@link module:engine/conversion/downcastdispatcher~DowncastDispatcher#event:addMarker}. Additionally,\n\t * the `data.isOpening` parameter is passed, which is set to `true` for the marker start boundary element, and `false` to\n\t * the marker end boundary element.\n\t *\n\t * See {@link module:engine/conversion/conversion~Conversion#for `conversion.for()`} to learn how to add a converter\n\t * to the conversion process.\n\t *\n\t * @method #markerToElement\n\t * @param {Object} config Conversion configuration.\n\t * @param {String} config.model The name of the model marker (or model marker group) to convert.\n\t * @param {module:engine/view/elementdefinition~ElementDefinition|Function} config.view A view element definition or a function that\n\t * takes the model marker data and {@link module:engine/conversion/downcastdispatcher~DowncastConversionApi downcast conversion API}\n\t * as a parameters and returns a view UI element.\n\t * @param {module:utils/priorities~PriorityString} [config.converterPriority='normal'] Converter priority.\n\t * @returns {module:engine/conversion/downcasthelpers~DowncastHelpers}\n\t */\n\tmarkerToElement( config ) {\n\t\treturn this.add( downcastMarkerToElement( config ) );\n\t}\n\n\t/**\n\t * Model marker to highlight conversion helper.\n\t *\n\t * This conversion results in creating a highlight on view nodes. For this kind of conversion,\n\t * {@link module:engine/conversion/downcasthelpers~HighlightDescriptor} should be provided.\n\t *\n\t * For text nodes, a `<span>` {@link module:engine/view/attributeelement~AttributeElement} is created and it wraps all text nodes\n\t * in the converted marker range. For example, a model marker set like this: `<paragraph>F[oo b]ar</paragraph>` becomes\n\t * `<p>F<span class=\"comment\">oo b</span>ar</p>` in the view.\n\t *\n\t * {@link module:engine/view/containerelement~ContainerElement} may provide a custom way of handling highlight. Most often,\n\t * the element itself is given classes and attributes described in the highlight descriptor (instead of being wrapped in `<span>`).\n\t * For example, a model marker set like this: `[<image src=\"foo.jpg\"></image>]` becomes `<img src=\"foo.jpg\" class=\"comment\"></img>`\n\t * in the view.\n\t *\n\t * For container elements, the conversion is two-step. While the converter processes the highlight descriptor and passes it\n\t * to a container element, it is the container element instance itself that applies values from the highlight descriptor.\n\t * So, in a sense, the converter takes care of stating what should be applied on what, while the element decides how to apply that.\n\t *\n\t *\t\teditor.conversion.for( 'downcast' ).markerToHighlight( { model: 'comment', view: { classes: 'comment' } } );\n\t *\n\t *\t\teditor.conversion.for( 'downcast' ).markerToHighlight( {\n\t *\t\t\tmodel: 'comment',\n\t *\t\t\tview: { classes: 'new-comment' },\n\t *\t\t\tconverterPriority: 'high'\n\t *\t\t} );\n\t *\n\t *\t\teditor.conversion.for( 'downcast' ).markerToHighlight( {\n\t *\t\t\tmodel: 'comment',\n\t *\t\t\tview: ( data, converstionApi ) => {\n\t *\t\t\t\t// Assuming that the marker name is in a form of comment:commentType.\n\t *\t\t\t\tconst commentType = data.markerName.split( ':' )[ 1 ];\n\t *\n\t *\t\t\t\treturn {\n\t *\t\t\t\t\tclasses: [ 'comment', 'comment-' + commentType ]\n\t *\t\t\t\t};\n\t *\t\t\t}\n\t *\t\t} );\n\t *\n\t * If a function is passed as the `config.view` parameter, it will be used to generate the highlight descriptor. The function\n\t * receives the `data` object and {@link module:engine/conversion/downcastdispatcher~DowncastConversionApi downcast conversion API}\n\t * as a parameters and should return a\n\t * {@link module:engine/conversion/downcasthelpers~HighlightDescriptor highlight descriptor}.\n\t * The `data` object properties are passed from {@link module:engine/conversion/downcastdispatcher~DowncastDispatcher#event:addMarker}.\n\t *\n\t * See {@link module:engine/conversion/conversion~Conversion#for `conversion.for()`} to learn how to add a converter\n\t * to the conversion process.\n\t *\n\t * @method #markerToHighlight\n\t * @param {Object} config Conversion configuration.\n\t * @param {String} config.model The name of the model marker (or model marker group) to convert.\n\t * @param {module:engine/conversion/downcasthelpers~HighlightDescriptor|Function} config.view A highlight descriptor\n\t * that will be used for highlighting or a function that takes the model marker data and\n\t * {@link module:engine/conversion/downcastdispatcher~DowncastConversionApi downcast conversion API} as a parameters\n\t * and returns a highlight descriptor.\n\t * @param {module:utils/priorities~PriorityString} [config.converterPriority='normal'] Converter priority.\n\t * @returns {module:engine/conversion/downcasthelpers~DowncastHelpers}\n\t */\n\tmarkerToHighlight( config ) {\n\t\treturn this.add( downcastMarkerToHighlight( config ) );\n\t}\n\n\t/**\n\t * Model marker converter for data downcast.\n\t *\n\t * This conversion creates a representation for model marker boundaries in the view:\n\t *\n\t * * If the marker boundary is at a position where text nodes are allowed, then a view element with the specified tag name\n\t * and `name` attribute is added at this position.\n\t * * In other cases, a specified attribute is set on a view element that is before or after the marker boundary.\n\t *\n\t * Typically, marker names use the `group:uniqueId:otherData` convention. For example: `comment:e34zfk9k2n459df53sjl34:zx32c`.\n\t * The default configuration for this conversion is that the first part is the `group` part and the rest of\n\t * the marker name becomes the `name` part.\n\t *\n\t * Tag and attribute names and values are generated from the marker name:\n\t *\n\t * * Templates for attributes are `data-[group]-start-before=\"[name]\"`, `data-[group]-start-after=\"[name]\"`,\n\t * `data-[group]-end-before=\"[name]\"` and `data-[group]-end-after=\"[name]\"`.\n\t * * Templates for view elements are `<[group]-start name=\"[name]\">` and `<[group]-end name=\"[name]\">`.\n\t *\n\t * Attributes mark whether the given marker's start or end boundary is before or after the given element.\n\t * Attributes `data-[group]-start-before` and `data-[group]-end-after` are favored.\n\t * The other two are used when the former two cannot be used.\n\t *\n\t * The conversion configuration can take a function that will generate different group and name parts.\n\t * If such function is set as the `config.view` parameter, it is passed a marker name and it is expected to return an object with two\n\t * properties: `group` and `name`. If the function returns a falsy value, the conversion will not take place.\n\t *\n\t * Basic usage:\n\t *\n\t *\t\t// Using the default conversion.\n\t *\t\t// In this case, all markers whose name starts with 'comment:' will be converted.\n\t *\t\t// The `group` parameter will be set to `comment`.\n\t *\t\t// The `name` parameter will be the rest of the marker name (without `:`).\n\t *\t\teditor.conversion.for( 'dataDowncast' ).markerToData( {\n\t *\t\t\tmodel: 'comment'\n\t *\t\t} );\n\t *\n\t * An example of a view that may be generated by this conversion (assuming a marker with the name `comment:commentId:uid` marked\n\t * by `[]`):\n\t *\n\t *\t\t// Model:\n\t *\t\t<paragraph>Foo[bar</paragraph>\n\t *\t\t<image src=\"abc.jpg\"></image>]\n\t *\n\t *\t\t// View:\n\t *\t\t<p>Foo<comment-start name=\"commentId:uid\"></comment-start>bar</p>\n\t *\t\t<figure data-comment-end-after=\"commentId:uid\" class=\"image\"><img src=\"abc.jpg\" /></figure>\n\t *\n\t * In the example above, the comment starts before \"bar\" and ends after the image.\n\t *\n\t * If the `name` part is empty, the following view may be generated:\n\t *\n\t *\t\t<p>Foo <myMarker-start></myMarker-start>bar</p>\n\t *\t\t<figure data-myMarker-end-after=\"\" class=\"image\"><img src=\"abc.jpg\" /></figure>\n\t *\n\t * **Note:** A situation where some markers have the `name` part and some do not have it is incorrect and should be avoided.\n\t *\n\t * Examples where `data-group-start-after` and `data-group-end-before` are used:\n\t *\n\t *\t\t// Model:\n\t *\t\t<blockQuote>[]<paragraph>Foo</paragraph></blockQuote>\n\t *\n\t * \t\t// View:\n\t *\t\t<blockquote><p data-group-end-before=\"name\" data-group-start-before=\"name\">Foo</p></blockquote>\n\t *\n\t * Similarly, when a marker is collapsed after the last element:\n\t *\n\t *\t\t// Model:\n\t *\t\t<blockQuote><paragraph>Foo</paragraph>[]</blockQuote>\n\t *\n\t *\t\t// View:\n\t *\t\t<blockquote><p data-group-end-after=\"name\" data-group-start-after=\"name\">Foo</p></blockquote>\n\t *\n\t * When there are multiple markers from the same group stored in the same attribute of the same element, their\n\t * name parts are put together in the attribute value, for example: `data-group-start-before=\"name1,name2,name3\"`.\n\t *\n\t * Other examples of usage:\n\t *\n\t *\t\t// Using a custom function which is the same as the default conversion:\n\t *\t\teditor.conversion.for( 'dataDowncast' ).markerToData( {\n\t *\t\t\tmodel: 'comment'\n\t *\t\t\tview: markerName => ( {\n\t *\t\t\t\tgroup: 'comment',\n\t *\t\t\t\tname: markerName.substr( 8 ) // Removes 'comment:' part.\n\t *\t\t\t} )\n\t *\t\t} );\n\t *\n\t *\t\t// Using the converter priority:\n\t *\t\teditor.conversion.for( 'dataDowncast' ).markerToData( {\n\t *\t\t\tmodel: 'comment'\n\t *\t\t\tview: markerName => ( {\n\t *\t\t\t\tgroup: 'comment',\n\t *\t\t\t\tname: markerName.substr( 8 ) // Removes 'comment:' part.\n\t *\t\t\t} ),\n\t *\t\t\tconverterPriority: 'high'\n\t *\t\t} );\n\t *\n\t * This kind of conversion is useful for saving data into the database, so it should be used in the data conversion pipeline.\n\t *\n\t * See {@link module:engine/conversion/conversion~Conversion#for `conversion.for()`} to learn how to add a converter\n\t * to the conversion process.\n\t *\n\t * @method #markerToData\n\t * @param {Object} config Conversion configuration.\n\t * @param {String} config.model The name of the model marker (or model marker group) to convert.\n\t * @param {Function} [config.view] A function that takes the model marker name and\n\t * {@link module:engine/conversion/downcastdispatcher~DowncastConversionApi downcast conversion API} as a parameters\n\t * and returns an object with the `group` and `name` properties.\n\t * @param {module:utils/priorities~PriorityString} [config.converterPriority='normal'] Converter priority.\n\t * @returns {module:engine/conversion/downcasthelpers~DowncastHelpers}\n\t */\n\tmarkerToData( config ) {\n\t\treturn this.add( downcastMarkerToData( config ) );\n\t}\n}\n\n/**\n * Function factory that creates a default downcast converter for text insertion changes.\n *\n * The converter automatically consumes the corresponding value from the consumables list and stops the event (see\n * {@link module:engine/conversion/downcastdispatcher~DowncastDispatcher}).\n *\n *\t\tmodelDispatcher.on( 'insert:$text', insertText() );\n *\n * @returns {Function} Insert text event converter.\n */\nexport function insertText() {\n\treturn ( evt, data, conversionApi ) => {\n\t\tif ( !conversionApi.consumable.consume( data.item, 'insert' ) ) {\n\t\t\treturn;\n\t\t}\n\n\t\tconst viewWriter = conversionApi.writer;\n\t\tconst viewPosition = conversionApi.mapper.toViewPosition( data.range.start );\n\t\tconst viewText = viewWriter.createText( data.item.data );\n\n\t\tviewWriter.insert( viewPosition, viewText );\n\t};\n}\n\n/**\n * Function factory that creates a default downcast converter for node remove changes.\n *\n *\t\tmodelDispatcher.on( 'remove', remove() );\n *\n * @returns {Function} Remove event converter.\n */\nexport function remove() {\n\treturn ( evt, data, conversionApi ) => {\n\t\t// Find view range start position by mapping model position at which the remove happened.\n\t\tconst viewStart = conversionApi.mapper.toViewPosition( data.position );\n\n\t\tconst modelEnd = data.position.getShiftedBy( data.length );\n\t\tconst viewEnd = conversionApi.mapper.toViewPosition( modelEnd, { isPhantom: true } );\n\n\t\tconst viewRange = conversionApi.writer.createRange( viewStart, viewEnd );\n\n\t\t// Trim the range to remove in case some UI elements are on the view range boundaries.\n\t\tconst removed = conversionApi.writer.remove( viewRange.getTrimmed() );\n\n\t\t// After the range is removed, unbind all view elements from the model.\n\t\t// Range inside view document fragment is used to unbind deeply.\n\t\tfor ( const child of conversionApi.writer.createRangeIn( removed ).getItems() ) {\n\t\t\tconversionApi.mapper.unbindViewElement( child );\n\t\t}\n\t};\n}\n\n/**\n * Creates a `<span>` {@link module:engine/view/attributeelement~AttributeElement view attribute element} from the information\n * provided by the {@link module:engine/conversion/downcasthelpers~HighlightDescriptor highlight descriptor} object. If a priority\n * is not provided in the descriptor, the default priority will be used.\n *\n * @param {module:engine/view/downcastwriter~DowncastWriter} writer\n * @param {module:engine/conversion/downcasthelpers~HighlightDescriptor} descriptor\n * @returns {module:engine/view/attributeelement~AttributeElement}\n */\nexport function createViewElementFromHighlightDescriptor( writer, descriptor ) {\n\tconst viewElement = writer.createAttributeElement( 'span', descriptor.attributes );\n\n\tif ( descriptor.classes ) {\n\t\tviewElement._addClass( descriptor.classes );\n\t}\n\n\tif ( descriptor.priority ) {\n\t\tviewElement._priority = descriptor.priority;\n\t}\n\n\tviewElement._id = descriptor.id;\n\n\treturn viewElement;\n}\n\n/**\n * Function factory that creates a converter which converts a non-collapsed {@link module:engine/model/selection~Selection model selection}\n * to a {@link module:engine/view/documentselection~DocumentSelection view selection}. The converter consumes appropriate\n * value from the `consumable` object and maps model positions from the selection to view positions.\n *\n *\t\tmodelDispatcher.on( 'selection', convertRangeSelection() );\n *\n * @returns {Function} Selection converter.\n */\nexport function convertRangeSelection() {\n\treturn ( evt, data, conversionApi ) => {\n\t\tconst selection = data.selection;\n\n\t\tif ( selection.isCollapsed ) {\n\t\t\treturn;\n\t\t}\n\n\t\tif ( !conversionApi.consumable.consume( selection, 'selection' ) ) {\n\t\t\treturn;\n\t\t}\n\n\t\tconst viewRanges = [];\n\n\t\tfor ( const range of selection.getRanges() ) {\n\t\t\tconst viewRange = conversionApi.mapper.toViewRange( range );\n\t\t\tviewRanges.push( viewRange );\n\t\t}\n\n\t\tconversionApi.writer.setSelection( viewRanges, { backward: selection.isBackward } );\n\t};\n}\n\n/**\n * Function factory that creates a converter which converts a collapsed {@link module:engine/model/selection~Selection model selection} to\n * a {@link module:engine/view/documentselection~DocumentSelection view selection}. The converter consumes appropriate\n * value from the `consumable` object, maps the model selection position to the view position and breaks\n * {@link module:engine/view/attributeelement~AttributeElement attribute elements} at the selection position.\n *\n *\t\tmodelDispatcher.on( 'selection', convertCollapsedSelection() );\n *\n * An example of the view state before and after converting the collapsed selection:\n *\n *\t\t   <p><strong>f^oo<strong>bar</p>\n *\t\t-> <p><strong>f</strong>^<strong>oo</strong>bar</p>\n *\n * By breaking attribute elements like `<strong>`, the selection is in a correct element. Then, when the selection attribute is\n * converted, broken attributes might be merged again, or the position where the selection is may be wrapped\n * with different, appropriate attribute elements.\n *\n * See also {@link module:engine/conversion/downcasthelpers~clearAttributes} which does a clean-up\n * by merging attributes.\n *\n * @returns {Function} Selection converter.\n */\nexport function convertCollapsedSelection() {\n\treturn ( evt, data, conversionApi ) => {\n\t\tconst selection = data.selection;\n\n\t\tif ( !selection.isCollapsed ) {\n\t\t\treturn;\n\t\t}\n\n\t\tif ( !conversionApi.consumable.consume( selection, 'selection' ) ) {\n\t\t\treturn;\n\t\t}\n\n\t\tconst viewWriter = conversionApi.writer;\n\t\tconst modelPosition = selection.getFirstPosition();\n\t\tconst viewPosition = conversionApi.mapper.toViewPosition( modelPosition );\n\t\tconst brokenPosition = viewWriter.breakAttributes( viewPosition );\n\n\t\tviewWriter.setSelection( brokenPosition );\n\t};\n}\n\n/**\n * Function factory that creates a converter which clears artifacts after the previous\n * {@link module:engine/model/selection~Selection model selection} conversion. It removes all empty\n * {@link module:engine/view/attributeelement~AttributeElement view attribute elements} and merges sibling attributes at all start and end\n * positions of all ranges.\n *\n *\t\t   <p><strong>^</strong></p>\n *\t\t-> <p>^</p>\n *\n *\t\t   <p><strong>foo</strong>^<strong>bar</strong>bar</p>\n *\t\t-> <p><strong>foo^bar<strong>bar</p>\n *\n *\t\t   <p><strong>foo</strong><em>^</em><strong>bar</strong>bar</p>\n *\t\t-> <p><strong>foo^bar<strong>bar</p>\n *\n * This listener should be assigned before any converter for the new selection:\n *\n *\t\tmodelDispatcher.on( 'selection', clearAttributes() );\n *\n * See {@link module:engine/conversion/downcasthelpers~convertCollapsedSelection}\n * which does the opposite by breaking attributes in the selection position.\n *\n * @returns {Function} Selection converter.\n */\nexport function clearAttributes() {\n\treturn ( evt, data, conversionApi ) => {\n\t\tconst viewWriter = conversionApi.writer;\n\t\tconst viewSelection = viewWriter.document.selection;\n\n\t\tfor ( const range of viewSelection.getRanges() ) {\n\t\t\t// Not collapsed selection should not have artifacts.\n\t\t\tif ( range.isCollapsed ) {\n\t\t\t\t// Position might be in the node removed by the view writer.\n\t\t\t\tif ( range.end.parent.isAttached() ) {\n\t\t\t\t\tconversionApi.writer.mergeAttributes( range.start );\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\t\tviewWriter.setSelection( null );\n\t};\n}\n\n/**\n * Function factory that creates a converter which converts set/change/remove attribute changes from the model to the view.\n * It can also be used to convert selection attributes. In that case, an empty attribute element will be created and the\n * selection will be put inside it.\n *\n * Attributes from the model are converted to a view element that will be wrapping these view nodes that are bound to\n * model elements having the given attribute. This is useful for attributes like `bold` that may be set on text nodes in the model\n * but are represented as an element in the view:\n *\n *\t\t[paragraph]              MODEL ====> VIEW        <p>\n *\t\t\t|- a {bold: true}                             |- <b>\n *\t\t\t|- b {bold: true}                             |   |- ab\n *\t\t\t|- c                                          |- c\n *\n * Passed `Function` will be provided with the attribute value and then all the parameters of the\n * {@link module:engine/conversion/downcastdispatcher~DowncastDispatcher#event:attribute `attribute` event}.\n * It is expected that the function returns an {@link module:engine/view/element~Element}.\n * The result of the function will be the wrapping element.\n * When the provided `Function` does not return any element, no conversion will take place.\n *\n * The converter automatically consumes the corresponding value from the consumables list and stops the event (see\n * {@link module:engine/conversion/downcastdispatcher~DowncastDispatcher}).\n *\n *\t\tmodelDispatcher.on( 'attribute:bold', wrap( ( modelAttributeValue, { writer } ) => {\n *\t\t\treturn writer.createAttributeElement( 'strong' );\n *\t\t} );\n *\n * @protected\n * @param {Function} elementCreator Function returning a view element that will be used for wrapping.\n * @returns {Function} Set/change attribute converter.\n */\nexport function wrap( elementCreator ) {\n\treturn ( evt, data, conversionApi ) => {\n\t\t// Recreate current wrapping node. It will be used to unwrap view range if the attribute value has changed\n\t\t// or the attribute was removed.\n\t\tconst oldViewElement = elementCreator( data.attributeOldValue, conversionApi );\n\n\t\t// Create node to wrap with.\n\t\tconst newViewElement = elementCreator( data.attributeNewValue, conversionApi );\n\n\t\tif ( !oldViewElement && !newViewElement ) {\n\t\t\treturn;\n\t\t}\n\n\t\tif ( !conversionApi.consumable.consume( data.item, evt.name ) ) {\n\t\t\treturn;\n\t\t}\n\n\t\tconst viewWriter = conversionApi.writer;\n\t\tconst viewSelection = viewWriter.document.selection;\n\n\t\tif ( data.item instanceof ModelSelection || data.item instanceof DocumentSelection ) {\n\t\t\t// Selection attribute conversion.\n\t\t\tviewWriter.wrap( viewSelection.getFirstRange(), newViewElement );\n\t\t} else {\n\t\t\t// Node attribute conversion.\n\t\t\tlet viewRange = conversionApi.mapper.toViewRange( data.range );\n\n\t\t\t// First, unwrap the range from current wrapper.\n\t\t\tif ( data.attributeOldValue !== null && oldViewElement ) {\n\t\t\t\tviewRange = viewWriter.unwrap( viewRange, oldViewElement );\n\t\t\t}\n\n\t\t\tif ( data.attributeNewValue !== null && newViewElement ) {\n\t\t\t\tviewWriter.wrap( viewRange, newViewElement );\n\t\t\t}\n\t\t}\n\t};\n}\n\n/**\n * Function factory that creates a converter which converts node insertion changes from the model to the view.\n * The function passed will be provided with all the parameters of the dispatcher's\n * {@link module:engine/conversion/downcastdispatcher~DowncastDispatcher#event:insert `insert` event}.\n * It is expected that the function returns an {@link module:engine/view/element~Element}.\n * The result of the function will be inserted into the view.\n *\n * The converter automatically consumes the corresponding value from the consumables list, stops the event (see\n * {@link module:engine/conversion/downcastdispatcher~DowncastDispatcher}) and binds the model and view elements.\n *\n *\t\tdowncastDispatcher.on(\n *\t\t\t'insert:myElem',\n *\t\t\tinsertElement( ( modelItem, { writer } ) => {\n *\t\t\t\tconst text = writer.createText( 'myText' );\n *\t\t\t\tconst myElem = writer.createElement( 'myElem', { myAttr: 'my-' + modelItem.getAttribute( 'myAttr' ) }, text );\n *\n *\t\t\t\t// Do something fancy with `myElem` using `modelItem` or other parameters.\n *\n *\t\t\t\treturn myElem;\n *\t\t\t}\n *\t\t) );\n *\n * @protected\n * @param {Function} elementCreator Function returning a view element, which will be inserted.\n * @returns {Function} Insert element event converter.\n */\nexport function insertElement( elementCreator ) {\n\treturn ( evt, data, conversionApi ) => {\n\t\tconst viewElement = elementCreator( data.item, conversionApi );\n\n\t\tif ( !viewElement ) {\n\t\t\treturn;\n\t\t}\n\n\t\tif ( !conversionApi.consumable.consume( data.item, 'insert' ) ) {\n\t\t\treturn;\n\t\t}\n\n\t\tconst viewPosition = conversionApi.mapper.toViewPosition( data.range.start );\n\n\t\tconversionApi.mapper.bindElements( data.item, viewElement );\n\t\tconversionApi.writer.insert( viewPosition, viewElement );\n\t};\n}\n\n/**\n * Function factory that creates a converter which converts marker adding change to the\n * {@link module:engine/view/uielement~UIElement view UI element}.\n *\n * The view UI element that will be added to the view depends on the passed parameter. See {@link ~insertElement}.\n * In case of a non-collapsed range, the UI element will not wrap nodes but separate elements will be placed at the beginning\n * and at the end of the range.\n *\n * This converter binds created UI elements with the marker name using {@link module:engine/conversion/mapper~Mapper#bindElementToMarker}.\n *\n * @protected\n * @param {module:engine/view/uielement~UIElement|Function} elementCreator A view UI element or a function returning the view element\n * that will be inserted.\n * @returns {Function} Insert element event converter.\n */\nexport function insertUIElement( elementCreator ) {\n\treturn ( evt, data, conversionApi ) => {\n\t\t// Create two view elements. One will be inserted at the beginning of marker, one at the end.\n\t\t// If marker is collapsed, only \"opening\" element will be inserted.\n\t\tdata.isOpening = true;\n\t\tconst viewStartElement = elementCreator( data, conversionApi );\n\n\t\tdata.isOpening = false;\n\t\tconst viewEndElement = elementCreator( data, conversionApi );\n\n\t\tif ( !viewStartElement || !viewEndElement ) {\n\t\t\treturn;\n\t\t}\n\n\t\tconst markerRange = data.markerRange;\n\n\t\t// Marker that is collapsed has consumable build differently that non-collapsed one.\n\t\t// For more information see `addMarker` event description.\n\t\t// If marker's range is collapsed - check if it can be consumed.\n\t\tif ( markerRange.isCollapsed && !conversionApi.consumable.consume( markerRange, evt.name ) ) {\n\t\t\treturn;\n\t\t}\n\n\t\t// If marker's range is not collapsed - consume all items inside.\n\t\tfor ( const value of markerRange ) {\n\t\t\tif ( !conversionApi.consumable.consume( value.item, evt.name ) ) {\n\t\t\t\treturn;\n\t\t\t}\n\t\t}\n\n\t\tconst mapper = conversionApi.mapper;\n\t\tconst viewWriter = conversionApi.writer;\n\n\t\t// Add \"opening\" element.\n\t\tviewWriter.insert( mapper.toViewPosition( markerRange.start ), viewStartElement );\n\t\tconversionApi.mapper.bindElementToMarker( viewStartElement, data.markerName );\n\n\t\t// Add \"closing\" element only if range is not collapsed.\n\t\tif ( !markerRange.isCollapsed ) {\n\t\t\tviewWriter.insert( mapper.toViewPosition( markerRange.end ), viewEndElement );\n\t\t\tconversionApi.mapper.bindElementToMarker( viewEndElement, data.markerName );\n\t\t}\n\n\t\tevt.stop();\n\t};\n}\n\n// Function factory that returns a default downcast converter for removing a {@link module:engine/view/uielement~UIElement UI element}\n// based on marker remove change.\n//\n// This converter unbinds elements from the marker name.\n//\n// @returns {Function} Removed UI element converter.\nfunction removeUIElement() {\n\treturn ( evt, data, conversionApi ) => {\n\t\tconst elements = conversionApi.mapper.markerNameToElements( data.markerName );\n\n\t\tif ( !elements ) {\n\t\t\treturn;\n\t\t}\n\n\t\tfor ( const element of elements ) {\n\t\t\tconversionApi.mapper.unbindElementFromMarkerName( element, data.markerName );\n\t\t\tconversionApi.writer.clear( conversionApi.writer.createRangeOn( element ), element );\n\t\t}\n\n\t\tconversionApi.writer.clearClonedElementsGroup( data.markerName );\n\n\t\tevt.stop();\n\t};\n}\n\n// Function factory that creates a default converter for model markers.\n//\n// See {@link DowncastHelpers#markerToData} for more information what type of view is generated.\n//\n// This converter binds created UI elements and affected view elements with the marker name\n// using {@link module:engine/conversion/mapper~Mapper#bindElementToMarker}.\n//\n// @returns {Function} Add marker converter.\nfunction insertMarkerData( viewCreator ) {\n\treturn ( evt, data, conversionApi ) => {\n\t\tconst viewMarkerData = viewCreator( data.markerName, conversionApi );\n\n\t\tif ( !viewMarkerData ) {\n\t\t\treturn;\n\t\t}\n\n\t\tconst markerRange = data.markerRange;\n\n\t\tif ( !conversionApi.consumable.consume( markerRange, evt.name ) ) {\n\t\t\treturn;\n\t\t}\n\n\t\t// Adding closing data first to keep the proper order in the view.\n\t\thandleMarkerBoundary( markerRange, false, conversionApi, data, viewMarkerData );\n\t\thandleMarkerBoundary( markerRange, true, conversionApi, data, viewMarkerData );\n\n\t\tevt.stop();\n\t};\n}\n\n// Helper function for `insertMarkerData()` that marks a marker boundary at the beginning or end of given `range`.\nfunction handleMarkerBoundary( range, isStart, conversionApi, data, viewMarkerData ) {\n\tconst modelPosition = isStart ? range.start : range.end;\n\tconst canInsertElement = conversionApi.schema.checkChild( modelPosition, '$text' );\n\n\tif ( canInsertElement ) {\n\t\tconst viewPosition = conversionApi.mapper.toViewPosition( modelPosition );\n\n\t\tinsertMarkerAsElement( viewPosition, isStart, conversionApi, data, viewMarkerData );\n\t} else {\n\t\tlet modelElement;\n\t\tlet isBefore;\n\n\t\t// If possible, we want to add `data-group-start-before` and `data-group-end-after` attributes.\n\t\t// Below `if` is constructed in a way that will favor adding these attributes.\n\t\t//\n\t\t// Also, I assume that there will be always an element either after or before the position.\n\t\t// If not, then it is a case when we are not in a position where text is allowed and also there are no elements around...\n\t\tif ( isStart && modelPosition.nodeAfter || !isStart && !modelPosition.nodeBefore ) {\n\t\t\tmodelElement = modelPosition.nodeAfter;\n\t\t\tisBefore = true;\n\t\t} else {\n\t\t\tmodelElement = modelPosition.nodeBefore;\n\t\t\tisBefore = false;\n\t\t}\n\n\t\tconst viewElement = conversionApi.mapper.toViewElement( modelElement );\n\n\t\tinsertMarkerAsAttribute( viewElement, isStart, isBefore, conversionApi, data, viewMarkerData );\n\t}\n}\n\n// Helper function for `insertMarkerData()` that marks a marker boundary in the view as an attribute on a view element.\nfunction insertMarkerAsAttribute( viewElement, isStart, isBefore, conversionApi, data, viewMarkerData ) {\n\tconst attributeName = `data-${ viewMarkerData.group }-${ isStart ? 'start' : 'end' }-${ isBefore ? 'before' : 'after' }`;\n\n\tconst markerNames = viewElement.hasAttribute( attributeName ) ? viewElement.getAttribute( attributeName ).split( ',' ) : [];\n\n\t// Adding marker name at the beginning to have the same order in the attribute as there is with marker elements.\n\tmarkerNames.unshift( viewMarkerData.name );\n\n\tconversionApi.writer.setAttribute( attributeName, markerNames.join( ',' ), viewElement );\n\tconversionApi.mapper.bindElementToMarker( viewElement, data.markerName );\n}\n\n// Helper function for `insertMarkerData()` that marks a marker boundary in the view as a separate view ui element.\nfunction insertMarkerAsElement( position, isStart, conversionApi, data, viewMarkerData ) {\n\tconst viewElementName = `${ viewMarkerData.group }-${ isStart ? 'start' : 'end' }`;\n\n\tconst attrs = viewMarkerData.name ? { 'name': viewMarkerData.name } : null;\n\tconst viewElement = conversionApi.writer.createUIElement( viewElementName, attrs );\n\n\tconversionApi.writer.insert( position, viewElement );\n\tconversionApi.mapper.bindElementToMarker( viewElement, data.markerName );\n}\n\n// Function factory that creates a converter for removing a model marker data added by the {@link #insertMarkerData} converter.\n//\n// @returns {Function} Remove marker converter.\nfunction removeMarkerData( viewCreator ) {\n\treturn ( evt, data, conversionApi ) => {\n\t\tconst viewData = viewCreator( data.markerName, conversionApi );\n\n\t\tif ( !viewData ) {\n\t\t\treturn;\n\t\t}\n\n\t\tconst elements = conversionApi.mapper.markerNameToElements( data.markerName );\n\n\t\tif ( !elements ) {\n\t\t\treturn;\n\t\t}\n\n\t\tfor ( const element of elements ) {\n\t\t\tconversionApi.mapper.unbindElementFromMarkerName( element, data.markerName );\n\n\t\t\tif ( element.is( 'containerElement' ) ) {\n\t\t\t\tremoveMarkerFromAttribute( `data-${ viewData.group }-start-before`, element );\n\t\t\t\tremoveMarkerFromAttribute( `data-${ viewData.group }-start-after`, element );\n\t\t\t\tremoveMarkerFromAttribute( `data-${ viewData.group }-end-before`, element );\n\t\t\t\tremoveMarkerFromAttribute( `data-${ viewData.group }-end-after`, element );\n\t\t\t} else {\n\t\t\t\tconversionApi.writer.clear( conversionApi.writer.createRangeOn( element ), element );\n\t\t\t}\n\t\t}\n\n\t\tconversionApi.writer.clearClonedElementsGroup( data.markerName );\n\n\t\tevt.stop();\n\n\t\tfunction removeMarkerFromAttribute( attributeName, element ) {\n\t\t\tif ( element.hasAttribute( attributeName ) ) {\n\t\t\t\tconst markerNames = new Set( element.getAttribute( attributeName ).split( ',' ) );\n\t\t\t\tmarkerNames.delete( viewData.name );\n\n\t\t\t\tif ( markerNames.size == 0 ) {\n\t\t\t\t\tconversionApi.writer.removeAttribute( attributeName, element );\n\t\t\t\t} else {\n\t\t\t\t\tconversionApi.writer.setAttribute( attributeName, Array.from( markerNames ).join( ',' ), element );\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\t};\n}\n\n// Function factory that creates a converter which converts set/change/remove attribute changes from the model to the view.\n//\n// Attributes from the model are converted to the view element attributes in the view. You may provide a custom function to generate\n// a key-value attribute pair to add/change/remove. If not provided, model attributes will be converted to view element\n// attributes on a one-to-one basis.\n//\n// *Note:** The provided attribute creator should always return the same `key` for a given attribute from the model.\n//\n// The converter automatically consumes the corresponding value from the consumables list and stops the event (see\n// {@link module:engine/conversion/downcastdispatcher~DowncastDispatcher}).\n//\n//\t\tmodelDispatcher.on( 'attribute:customAttr:myElem', changeAttribute( ( value, data ) => {\n//\t\t\t// Change attribute key from `customAttr` to `class` in the view.\n//\t\t\tconst key = 'class';\n//\t\t\tlet value = data.attributeNewValue;\n//\n//\t\t\t// Force attribute value to 'empty' if the model element is empty.\n//\t\t\tif ( data.item.childCount === 0 ) {\n//\t\t\t\tvalue = 'empty';\n//\t\t\t}\n//\n//\t\t\t// Return the key-value pair.\n//\t\t\treturn { key, value };\n//\t\t} ) );\n//\n// @param {Function} [attributeCreator] Function returning an object with two properties: `key` and `value`, which\n// represent the attribute key and attribute value to be set on a {@link module:engine/view/element~Element view element}.\n// The function is passed the model attribute value as the first parameter and additional data about the change as the second parameter.\n// @returns {Function} Set/change attribute converter.\nfunction changeAttribute( attributeCreator ) {\n\treturn ( evt, data, conversionApi ) => {\n\t\tconst oldAttribute = attributeCreator( data.attributeOldValue, conversionApi );\n\t\tconst newAttribute = attributeCreator( data.attributeNewValue, conversionApi );\n\n\t\tif ( !oldAttribute && !newAttribute ) {\n\t\t\treturn;\n\t\t}\n\n\t\tif ( !conversionApi.consumable.consume( data.item, evt.name ) ) {\n\t\t\treturn;\n\t\t}\n\n\t\tconst viewElement = conversionApi.mapper.toViewElement( data.item );\n\t\tconst viewWriter = conversionApi.writer;\n\n\t\t// If model item cannot be mapped to a view element, it means item is not an `Element` instance but a `TextProxy` node.\n\t\t// Only elements can have attributes in a view so do not proceed for anything else (#1587).\n\t\tif ( !viewElement ) {\n\t\t\t/**\n\t\t\t * This error occurs when a {@link module:engine/model/textproxy~TextProxy text node's} attribute is to be downcasted\n\t\t\t * by {@link module:engine/conversion/conversion~Conversion#attributeToAttribute `Attribute to Attribute converter`}.\n\t\t\t * In most cases it is caused by converters misconfiguration when only \"generic\" converter is defined:\n\t\t\t *\n\t\t\t *\t\teditor.conversion.for( 'downcast' ).attributeToAttribute( {\n\t\t\t *\t\t\tmodel: 'attribute-name',\n\t\t\t *\t\t\tview: 'attribute-name'\n\t\t\t *\t\t} ) );\n\t\t\t *\n\t\t\t * and given attribute is used on text node, for example:\n\t\t\t *\n\t\t\t *\t\tmodel.change( writer => {\n\t\t\t *\t\t\twriter.insertText( 'Foo', { 'attribute-name': 'bar' }, parent, 0 );\n\t\t\t *\t\t} );\n\t\t\t *\n\t\t\t * In such cases, to convert the same attribute for both {@link module:engine/model/element~Element}\n\t\t\t * and {@link module:engine/model/textproxy~TextProxy `Text`} nodes, text specific\n\t\t\t * {@link module:engine/conversion/conversion~Conversion#attributeToElement `Attribute to Element converter`}\n\t\t\t * with higher {@link module:utils/priorities~PriorityString priority} must also be defined:\n\t\t\t *\n\t\t\t *\t\teditor.conversion.for( 'downcast' ).attributeToElement( {\n\t\t\t *\t\t\tmodel: {\n\t\t\t *\t\t\t\tkey: 'attribute-name',\n\t\t\t *\t\t\t\tname: '$text'\n\t\t\t *\t\t\t},\n\t\t\t *\t\t\tview: ( value, { writer } ) => {\n\t\t\t *\t\t\t\treturn writer.createAttributeElement( 'span', { 'attribute-name': value } );\n\t\t\t *\t\t\t},\n\t\t\t *\t\t\tconverterPriority: 'high'\n\t\t\t *\t\t} ) );\n\t\t\t *\n\t\t\t * @error conversion-attribute-to-attribute-on-text\n\t\t\t */\n\t\t\tthrow new CKEditorError(\n\t\t\t\t'conversion-attribute-to-attribute-on-text',\n\t\t\t\t[ data, conversionApi ]\n\t\t\t);\n\t\t}\n\n\t\t// First remove the old attribute if there was one.\n\t\tif ( data.attributeOldValue !== null && oldAttribute ) {\n\t\t\tif ( oldAttribute.key == 'class' ) {\n\t\t\t\tconst classes = toArray( oldAttribute.value );\n\n\t\t\t\tfor ( const className of classes ) {\n\t\t\t\t\tviewWriter.removeClass( className, viewElement );\n\t\t\t\t}\n\t\t\t} else if ( oldAttribute.key == 'style' ) {\n\t\t\t\tconst keys = Object.keys( oldAttribute.value );\n\n\t\t\t\tfor ( const key of keys ) {\n\t\t\t\t\tviewWriter.removeStyle( key, viewElement );\n\t\t\t\t}\n\t\t\t} else {\n\t\t\t\tviewWriter.removeAttribute( oldAttribute.key, viewElement );\n\t\t\t}\n\t\t}\n\n\t\t// Then set the new attribute.\n\t\tif ( data.attributeNewValue !== null && newAttribute ) {\n\t\t\tif ( newAttribute.key == 'class' ) {\n\t\t\t\tconst classes = toArray( newAttribute.value );\n\n\t\t\t\tfor ( const className of classes ) {\n\t\t\t\t\tviewWriter.addClass( className, viewElement );\n\t\t\t\t}\n\t\t\t} else if ( newAttribute.key == 'style' ) {\n\t\t\t\tconst keys = Object.keys( newAttribute.value );\n\n\t\t\t\tfor ( const key of keys ) {\n\t\t\t\t\tviewWriter.setStyle( key, newAttribute.value[ key ], viewElement );\n\t\t\t\t}\n\t\t\t} else {\n\t\t\t\tviewWriter.setAttribute( newAttribute.key, newAttribute.value, viewElement );\n\t\t\t}\n\t\t}\n\t};\n}\n\n// Function factory that creates a converter which converts the text inside marker's range. The converter wraps the text with\n// {@link module:engine/view/attributeelement~AttributeElement} created from the provided descriptor.\n// See {link module:engine/conversion/downcasthelpers~createViewElementFromHighlightDescriptor}.\n//\n// It can also be used to convert the selection that is inside a marker. In that case, an empty attribute element will be\n// created and the selection will be put inside it.\n//\n// If the highlight descriptor does not provide the `priority` property, `10` will be used.\n//\n// If the highlight descriptor does not provide the `id` property, the name of the marker will be used.\n//\n// This converter binds the created {@link module:engine/view/attributeelement~AttributeElement attribute elemens} with the marker name\n// using the {@link module:engine/conversion/mapper~Mapper#bindElementToMarker} method.\n//\n// @param {module:engine/conversion/downcasthelpers~HighlightDescriptor|Function} highlightDescriptor\n// @returns {Function}\nfunction highlightText( highlightDescriptor ) {\n\treturn ( evt, data, conversionApi ) => {\n\t\tif ( !data.item ) {\n\t\t\treturn;\n\t\t}\n\n\t\tif ( !( data.item instanceof ModelSelection || data.item instanceof DocumentSelection ) && !data.item.is( '$textProxy' ) ) {\n\t\t\treturn;\n\t\t}\n\n\t\tconst descriptor = prepareDescriptor( highlightDescriptor, data, conversionApi );\n\n\t\tif ( !descriptor ) {\n\t\t\treturn;\n\t\t}\n\n\t\tif ( !conversionApi.consumable.consume( data.item, evt.name ) ) {\n\t\t\treturn;\n\t\t}\n\n\t\tconst viewWriter = conversionApi.writer;\n\t\tconst viewElement = createViewElementFromHighlightDescriptor( viewWriter, descriptor );\n\t\tconst viewSelection = viewWriter.document.selection;\n\n\t\tif ( data.item instanceof ModelSelection || data.item instanceof DocumentSelection ) {\n\t\t\tviewWriter.wrap( viewSelection.getFirstRange(), viewElement, viewSelection );\n\t\t} else {\n\t\t\tconst viewRange = conversionApi.mapper.toViewRange( data.range );\n\t\t\tconst rangeAfterWrap = viewWriter.wrap( viewRange, viewElement );\n\n\t\t\tfor ( const element of rangeAfterWrap.getItems() ) {\n\t\t\t\tif ( element.is( 'attributeElement' ) && element.isSimilar( viewElement ) ) {\n\t\t\t\t\tconversionApi.mapper.bindElementToMarker( element, data.markerName );\n\n\t\t\t\t\t// One attribute element is enough, because all of them are bound together by the view writer.\n\t\t\t\t\t// Mapper uses this binding to get all the elements no matter how many of them are registered in the mapper.\n\t\t\t\t\tbreak;\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\t};\n}\n\n// Converter function factory. It creates a function which applies the marker's highlight to an element inside the marker's range.\n//\n// The converter checks if an element has the `addHighlight` function stored as a\n// {@link module:engine/view/element~Element#_setCustomProperty custom property} and, if so, uses it to apply the highlight.\n// In such case the converter will consume all element's children, assuming that they were handled by the element itself.\n//\n// When the `addHighlight` custom property is not present, the element is not converted in any special way.\n// This means that converters will proceed to convert the element's child nodes.\n//\n// If the highlight descriptor does not provide the `priority` property, `10` will be used.\n//\n// If the highlight descriptor does not provide the `id` property, the name of the marker will be used.\n//\n// This converter binds altered {@link module:engine/view/containerelement~ContainerElement container elements} with the marker name using\n// the {@link module:engine/conversion/mapper~Mapper#bindElementToMarker} method.\n//\n// @param {module:engine/conversion/downcasthelpers~HighlightDescriptor|Function} highlightDescriptor\n// @returns {Function}\nfunction highlightElement( highlightDescriptor ) {\n\treturn ( evt, data, conversionApi ) => {\n\t\tif ( !data.item ) {\n\t\t\treturn;\n\t\t}\n\n\t\tif ( !( data.item instanceof ModelElement ) ) {\n\t\t\treturn;\n\t\t}\n\n\t\tconst descriptor = prepareDescriptor( highlightDescriptor, data, conversionApi );\n\n\t\tif ( !descriptor ) {\n\t\t\treturn;\n\t\t}\n\n\t\tif ( !conversionApi.consumable.test( data.item, evt.name ) ) {\n\t\t\treturn;\n\t\t}\n\n\t\tconst viewElement = conversionApi.mapper.toViewElement( data.item );\n\n\t\tif ( viewElement && viewElement.getCustomProperty( 'addHighlight' ) ) {\n\t\t\t// Consume element itself.\n\t\t\tconversionApi.consumable.consume( data.item, evt.name );\n\n\t\t\t// Consume all children nodes.\n\t\t\tfor ( const value of ModelRange._createIn( data.item ) ) {\n\t\t\t\tconversionApi.consumable.consume( value.item, evt.name );\n\t\t\t}\n\n\t\t\tviewElement.getCustomProperty( 'addHighlight' )( viewElement, descriptor, conversionApi.writer );\n\n\t\t\tconversionApi.mapper.bindElementToMarker( viewElement, data.markerName );\n\t\t}\n\t};\n}\n\n// Function factory that creates a converter which converts the removing model marker to the view.\n//\n// Both text nodes and elements are handled by this converter but they are handled a bit differently.\n//\n// Text nodes are unwrapped using the {@link module:engine/view/attributeelement~AttributeElement attribute element} created from the\n// provided highlight descriptor. See {link module:engine/conversion/downcasthelpers~HighlightDescriptor}.\n//\n// For elements, the converter checks if an element has the `removeHighlight` function stored as a\n// {@link module:engine/view/element~Element#_setCustomProperty custom property}. If so, it uses it to remove the highlight.\n// In such case, the children of that element will not be converted.\n//\n// When `removeHighlight` is not present, the element is not converted in any special way.\n// The converter will proceed to convert the element's child nodes instead.\n//\n// If the highlight descriptor does not provide the `priority` property, `10` will be used.\n//\n// If the highlight descriptor does not provide the `id` property, the name of the marker will be used.\n//\n// This converter unbinds elements from the marker name.\n//\n// @param {module:engine/conversion/downcasthelpers~HighlightDescriptor|Function} highlightDescriptor\n// @returns {Function}\nfunction removeHighlight( highlightDescriptor ) {\n\treturn ( evt, data, conversionApi ) => {\n\t\t// This conversion makes sense only for non-collapsed range.\n\t\tif ( data.markerRange.isCollapsed ) {\n\t\t\treturn;\n\t\t}\n\n\t\tconst descriptor = prepareDescriptor( highlightDescriptor, data, conversionApi );\n\n\t\tif ( !descriptor ) {\n\t\t\treturn;\n\t\t}\n\n\t\t// View element that will be used to unwrap `AttributeElement`s.\n\t\tconst viewHighlightElement = createViewElementFromHighlightDescriptor( conversionApi.writer, descriptor );\n\n\t\t// Get all elements bound with given marker name.\n\t\tconst elements = conversionApi.mapper.markerNameToElements( data.markerName );\n\n\t\tif ( !elements ) {\n\t\t\treturn;\n\t\t}\n\n\t\tfor ( const element of elements ) {\n\t\t\tconversionApi.mapper.unbindElementFromMarkerName( element, data.markerName );\n\n\t\t\tif ( element.is( 'attributeElement' ) ) {\n\t\t\t\tconversionApi.writer.unwrap( conversionApi.writer.createRangeOn( element ), viewHighlightElement );\n\t\t\t} else {\n\t\t\t\t// if element.is( 'containerElement' ).\n\t\t\t\telement.getCustomProperty( 'removeHighlight' )( element, descriptor.id, conversionApi.writer );\n\t\t\t}\n\t\t}\n\n\t\tconversionApi.writer.clearClonedElementsGroup( data.markerName );\n\n\t\tevt.stop();\n\t};\n}\n\n// Model element to view element conversion helper.\n//\n// See {@link ~DowncastHelpers#elementToElement `.elementToElement()` downcast helper} for examples and config params description.\n//\n// @param {Object} config Conversion configuration.\n// @param {String} config.model\n// @param {module:engine/view/elementdefinition~ElementDefinition|Function} config.view\n// @param {Object} [config.triggerBy]\n// @param {Array.<String>} [config.triggerBy.attributes]\n// @param {Array.<String>} [config.triggerBy.children]\n// @returns {Function} Conversion helper.\nfunction downcastElementToElement( config ) {\n\tconfig = cloneDeep( config );\n\n\tconfig.view = normalizeToElementConfig( config.view, 'container' );\n\n\treturn dispatcher => {\n\t\tdispatcher.on( 'insert:' + config.model, insertElement( config.view ), { priority: config.converterPriority || 'normal' } );\n\n\t\tif ( config.triggerBy ) {\n\t\t\tif ( config.triggerBy.attributes ) {\n\t\t\t\tfor ( const attributeKey of config.triggerBy.attributes ) {\n\t\t\t\t\tdispatcher._mapReconversionTriggerEvent( config.model, `attribute:${ attributeKey }:${ config.model }` );\n\t\t\t\t}\n\t\t\t}\n\n\t\t\tif ( config.triggerBy.children ) {\n\t\t\t\tfor ( const childName of config.triggerBy.children ) {\n\t\t\t\t\tdispatcher._mapReconversionTriggerEvent( config.model, `insert:${ childName }` );\n\t\t\t\t\tdispatcher._mapReconversionTriggerEvent( config.model, `remove:${ childName }` );\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\t};\n}\n\n// Model attribute to view element conversion helper.\n//\n// See {@link ~DowncastHelpers#attributeToElement `.attributeToElement()` downcast helper} for examples.\n//\n// @param {Object} config Conversion configuration.\n// @param {String|Object} config.model The key of the attribute to convert from or a `{ key, values }` object. `values` is an array\n// of `String`s with possible values if the model attribute is an enumerable.\n// @param {module:engine/view/elementdefinition~ElementDefinition|Function|Object} config.view A view element definition or a function\n// that takes the model attribute value and {@link module:engine/view/downcastwriter~DowncastWriter view downcast writer}\n// as parameters and returns a view attribute element. If `config.model.values` is\n// given, `config.view` should be an object assigning values from `config.model.values` to view element definitions or functions.\n// @param {module:utils/priorities~PriorityString} [config.converterPriority='normal'] Converter priority.\n// @returns {Function} Conversion helper.\nfunction downcastAttributeToElement( config ) {\n\tconfig = cloneDeep( config );\n\n\tconst modelKey = config.model.key ? config.model.key : config.model;\n\tlet eventName = 'attribute:' + modelKey;\n\n\tif ( config.model.name ) {\n\t\teventName += ':' + config.model.name;\n\t}\n\n\tif ( config.model.values ) {\n\t\tfor ( const modelValue of config.model.values ) {\n\t\t\tconfig.view[ modelValue ] = normalizeToElementConfig( config.view[ modelValue ], 'attribute' );\n\t\t}\n\t} else {\n\t\tconfig.view = normalizeToElementConfig( config.view, 'attribute' );\n\t}\n\n\tconst elementCreator = getFromAttributeCreator( config );\n\n\treturn dispatcher => {\n\t\tdispatcher.on( eventName, wrap( elementCreator ), { priority: config.converterPriority || 'normal' } );\n\t};\n}\n\n// Model attribute to view attribute conversion helper.\n//\n// See {@link ~DowncastHelpers#attributeToAttribute `.attributeToAttribute()` downcast helper} for examples.\n//\n// @param {Object} config Conversion configuration.\n// @param {String|Object} config.model The key of the attribute to convert from or a `{ key, values, [ name ] }` object describing\n// the attribute key, possible values and, optionally, an element name to convert from.\n// @param {String|Object|Function} config.view A view attribute key, or a `{ key, value }` object or a function that takes\n// the model attribute value and returns a `{ key, value }` object. If `key` is `'class'`, `value` can be a `String` or an\n// array of `String`s. If `key` is `'style'`, `value` is an object with key-value pairs. In other cases, `value` is a `String`.\n// If `config.model.values` is set, `config.view` should be an object assigning values from `config.model.values` to\n// `{ key, value }` objects or a functions.\n// @param {module:utils/priorities~PriorityString} [config.converterPriority='normal'] Converter priority.\n// @returns {Function} Conversion helper.\nfunction downcastAttributeToAttribute( config ) {\n\tconfig = cloneDeep( config );\n\n\tconst modelKey = config.model.key ? config.model.key : config.model;\n\tlet eventName = 'attribute:' + modelKey;\n\n\tif ( config.model.name ) {\n\t\teventName += ':' + config.model.name;\n\t}\n\n\tif ( config.model.values ) {\n\t\tfor ( const modelValue of config.model.values ) {\n\t\t\tconfig.view[ modelValue ] = normalizeToAttributeConfig( config.view[ modelValue ] );\n\t\t}\n\t} else {\n\t\tconfig.view = normalizeToAttributeConfig( config.view );\n\t}\n\n\tconst elementCreator = getFromAttributeCreator( config );\n\n\treturn dispatcher => {\n\t\tdispatcher.on( eventName, changeAttribute( elementCreator ), { priority: config.converterPriority || 'normal' } );\n\t};\n}\n\n// Model marker to view element conversion helper.\n//\n// See {@link ~DowncastHelpers#markerToElement `.markerToElement()` downcast helper} for examples.\n//\n// @param {Object} config Conversion configuration.\n// @param {String} config.model The name of the model marker (or model marker group) to convert.\n// @param {module:engine/view/elementdefinition~ElementDefinition|Function} config.view A view element definition or a function\n// that takes the model marker data as a parameter and returns a view UI element.\n// @param {module:utils/priorities~PriorityString} [config.converterPriority='normal'] Converter priority.\n// @returns {Function} Conversion helper.\nfunction downcastMarkerToElement( config ) {\n\tconfig = cloneDeep( config );\n\n\tconfig.view = normalizeToElementConfig( config.view, 'ui' );\n\n\treturn dispatcher => {\n\t\tdispatcher.on( 'addMarker:' + config.model, insertUIElement( config.view ), { priority: config.converterPriority || 'normal' } );\n\t\tdispatcher.on( 'removeMarker:' + config.model, removeUIElement( config.view ), { priority: config.converterPriority || 'normal' } );\n\t};\n}\n\n// Model marker to view data conversion helper.\n//\n// See {@link ~DowncastHelpers#markerToData `markerToData()` downcast helper} to learn more.\n//\n// @param {Object} config\n// @param {String} config.model\n// @param {Function} [config.view]\n// @param {module:utils/priorities~PriorityString} [config.converterPriority='normal']\n// @returns {Function} Conversion helper.\nfunction downcastMarkerToData( config ) {\n\tconfig = cloneDeep( config );\n\n\tconst group = config.model;\n\n\t// Default conversion.\n\tif ( !config.view ) {\n\t\tconfig.view = markerName => ( {\n\t\t\tgroup,\n\t\t\tname: markerName.substr( config.model.length + 1 )\n\t\t} );\n\t}\n\n\treturn dispatcher => {\n\t\tdispatcher.on( 'addMarker:' + group, insertMarkerData( config.view ), { priority: config.converterPriority || 'normal' } );\n\t\tdispatcher.on( 'removeMarker:' + group, removeMarkerData( config.view ), { priority: config.converterPriority || 'normal' } );\n\t};\n}\n\n// Model marker to highlight conversion helper.\n//\n// See {@link ~DowncastHelpers#markerToElement `.markerToElement()` downcast helper} for examples.\n//\n// @param {Object} config Conversion configuration.\n// @param {String} config.model The name of the model marker (or model marker group) to convert.\n// @param {module:engine/conversion/downcasthelpers~HighlightDescriptor|Function} config.view A highlight descriptor\n// that will be used for highlighting or a function that takes the model marker data as a parameter and returns a highlight descriptor.\n// @param {module:utils/priorities~PriorityString} [config.converterPriority='normal'] Converter priority.\n// @returns {Function} Conversion helper.\nfunction downcastMarkerToHighlight( config ) {\n\treturn dispatcher => {\n\t\tdispatcher.on( 'addMarker:' + config.model, highlightText( config.view ), { priority: config.converterPriority || 'normal' } );\n\t\tdispatcher.on( 'addMarker:' + config.model, highlightElement( config.view ), { priority: config.converterPriority || 'normal' } );\n\t\tdispatcher.on( 'removeMarker:' + config.model, removeHighlight( config.view ), { priority: config.converterPriority || 'normal' } );\n\t};\n}\n\n// Takes `config.view`, and if it is an {@link module:engine/view/elementdefinition~ElementDefinition}, converts it\n// to a function (because lower level converters accept only element creator functions).\n//\n// @param {module:engine/view/elementdefinition~ElementDefinition|Function} view View configuration.\n// @param {'container'|'attribute'|'ui'} viewElementType View element type to create.\n// @returns {Function} Element creator function to use in lower level converters.\nfunction normalizeToElementConfig( view, viewElementType ) {\n\tif ( typeof view == 'function' ) {\n\t\t// If `view` is already a function, don't do anything.\n\t\treturn view;\n\t}\n\n\treturn ( modelData, conversionApi ) => createViewElementFromDefinition( view, conversionApi, viewElementType );\n}\n\n// Creates a view element instance from the provided {@link module:engine/view/elementdefinition~ElementDefinition} and class.\n//\n// @param {module:engine/view/elementdefinition~ElementDefinition} viewElementDefinition\n// @param {module:engine/view/downcastwriter~DowncastWriter} viewWriter\n// @param {'container'|'attribute'|'ui'} viewElementType\n// @returns {module:engine/view/element~Element}\nfunction createViewElementFromDefinition( viewElementDefinition, conversionApi, viewElementType ) {\n\tif ( typeof viewElementDefinition == 'string' ) {\n\t\t// If `viewElementDefinition` is given as a `String`, normalize it to an object with `name` property.\n\t\tviewElementDefinition = { name: viewElementDefinition };\n\t}\n\n\tlet element;\n\tconst viewWriter = conversionApi.writer;\n\tconst attributes = Object.assign( {}, viewElementDefinition.attributes );\n\n\tif ( viewElementType == 'container' ) {\n\t\telement = viewWriter.createContainerElement( viewElementDefinition.name, attributes );\n\t} else if ( viewElementType == 'attribute' ) {\n\t\tconst options = {\n\t\t\tpriority: viewElementDefinition.priority || ViewAttributeElement.DEFAULT_PRIORITY\n\t\t};\n\n\t\telement = viewWriter.createAttributeElement( viewElementDefinition.name, attributes, options );\n\t} else {\n\t\t// 'ui'.\n\t\telement = viewWriter.createUIElement( viewElementDefinition.name, attributes );\n\t}\n\n\tif ( viewElementDefinition.styles ) {\n\t\tconst keys = Object.keys( viewElementDefinition.styles );\n\n\t\tfor ( const key of keys ) {\n\t\t\tviewWriter.setStyle( key, viewElementDefinition.styles[ key ], element );\n\t\t}\n\t}\n\n\tif ( viewElementDefinition.classes ) {\n\t\tconst classes = viewElementDefinition.classes;\n\n\t\tif ( typeof classes == 'string' ) {\n\t\t\tviewWriter.addClass( classes, element );\n\t\t} else {\n\t\t\tfor ( const className of classes ) {\n\t\t\t\tviewWriter.addClass( className, element );\n\t\t\t}\n\t\t}\n\t}\n\n\treturn element;\n}\n\nfunction getFromAttributeCreator( config ) {\n\tif ( config.model.values ) {\n\t\treturn ( modelAttributeValue, conversionApi ) => {\n\t\t\tconst view = config.view[ modelAttributeValue ];\n\n\t\t\tif ( view ) {\n\t\t\t\treturn view( modelAttributeValue, conversionApi );\n\t\t\t}\n\n\t\t\treturn null;\n\t\t};\n\t} else {\n\t\treturn config.view;\n\t}\n}\n\n// Takes the configuration, adds default parameters if they do not exist and normalizes other parameters to be used in downcast converters\n// for generating a view attribute.\n//\n// @param {Object} view View configuration.\nfunction normalizeToAttributeConfig( view ) {\n\tif ( typeof view == 'string' ) {\n\t\treturn modelAttributeValue => ( { key: view, value: modelAttributeValue } );\n\t} else if ( typeof view == 'object' ) {\n\t\t// { key, value, ... }\n\t\tif ( view.value ) {\n\t\t\treturn () => view;\n\t\t}\n\t\t// { key, ... }\n\t\telse {\n\t\t\treturn modelAttributeValue => ( { key: view.key, value: modelAttributeValue } );\n\t\t}\n\t} else {\n\t\t// function.\n\t\treturn view;\n\t}\n}\n\n// Helper function for `highlight`. Prepares the actual descriptor object using value passed to the converter.\nfunction prepareDescriptor( highlightDescriptor, data, conversionApi ) {\n\t// If passed descriptor is a creator function, call it. If not, just use passed value.\n\tconst descriptor = typeof highlightDescriptor == 'function' ?\n\t\thighlightDescriptor( data, conversionApi ) :\n\t\thighlightDescriptor;\n\n\tif ( !descriptor ) {\n\t\treturn null;\n\t}\n\n\t// Apply default descriptor priority.\n\tif ( !descriptor.priority ) {\n\t\tdescriptor.priority = 10;\n\t}\n\n\t// Default descriptor id is marker name.\n\tif ( !descriptor.id ) {\n\t\tdescriptor.id = data.markerName;\n\t}\n\n\treturn descriptor;\n}\n\n/**\n * An object describing how the marker highlight should be represented in the view.\n *\n * Each text node contained in a highlighted range will be wrapped in a `<span>`\n * {@link module:engine/view/attributeelement~AttributeElement view attribute element} with CSS class(es), attributes and a priority\n * described by this object.\n *\n * Additionally, each {@link module:engine/view/containerelement~ContainerElement container element} can handle displaying the highlight\n * separately by providing the `addHighlight` and `removeHighlight` custom properties. In this case:\n *\n *  * The `HighlightDescriptor` object is passed to the `addHighlight` function upon conversion and should be used to apply the highlight to\n *  the element.\n *  * The descriptor `id` is passed to the `removeHighlight` function upon conversion and should be used to remove the highlight with the\n *  given ID from the element.\n *\n * @typedef {Object} module:engine/conversion/downcasthelpers~HighlightDescriptor\n *\n * @property {String|Array.<String>} classes A CSS class or an array of classes to set. If the descriptor is used to\n * create an {@link module:engine/view/attributeelement~AttributeElement attribute element} over text nodes, these classes will be set\n * on that attribute element. If the descriptor is applied to an element, usually these classes will be set on that element, however,\n * this depends on how the element converts the descriptor.\n *\n * @property {String} [id] Descriptor identifier. If not provided, it defaults to the converted marker's name.\n *\n * @property {Number} [priority] Descriptor priority. If not provided, it defaults to `10`. If the descriptor is used to create\n * an {@link module:engine/view/attributeelement~AttributeElement attribute element}, it will be that element's\n * {@link module:engine/view/attributeelement~AttributeElement#priority priority}. If the descriptor is applied to an element,\n * the priority will be used to determine which descriptor is more important.\n *\n * @property {Object} [attributes] Attributes to set. If the descriptor is used to create\n * an {@link module:engine/view/attributeelement~AttributeElement attribute element} over text nodes, these attributes will be set on that\n * attribute element. If the descriptor is applied to an element, usually these attributes will be set on that element, however,\n * this depends on how the element converts the descriptor.\n */\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module engine/model/utils/autoparagraphing\n */\n\n/**\n * Fixes all empty roots.\n *\n * @protected\n * @param {module:engine/model/writer~Writer} writer The model writer.\n * @returns {Boolean} `true` if any change has been applied, `false` otherwise.\n */\nexport function autoParagraphEmptyRoots( writer ) {\n\tconst { schema, document } = writer.model;\n\n\tfor ( const rootName of document.getRootNames() ) {\n\t\tconst root = document.getRoot( rootName );\n\n\t\tif ( root.isEmpty && !schema.checkChild( root, '$text' ) ) {\n\t\t\t// If paragraph element is allowed in the root, create paragraph element.\n\t\t\tif ( schema.checkChild( root, 'paragraph' ) ) {\n\t\t\t\twriter.insertElement( 'paragraph', root );\n\n\t\t\t\t// Other roots will get fixed in the next post-fixer round. Those will be triggered\n\t\t\t\t// in the same batch no matter if this method was triggered by the post-fixing or not\n\t\t\t\t// (the above insertElement call will trigger the post-fixers).\n\t\t\t\treturn true;\n\t\t\t}\n\t\t}\n\t}\n\n\treturn false;\n}\n\n/**\n * Checks if the given node wrapped with a paragraph would be accepted by the schema in the given position.\n *\n * @protected\n * @param {module:engine/model/position~Position} position The position at which to check.\n * @param {module:engine/model/node~Node|String} nodeOrType The child node or child type to check.\n * @param {module:engine/model/schema~Schema} schema A schema instance used for element validation.\n */\nexport function isParagraphable( position, nodeOrType, schema ) {\n\tconst context = schema.createContext( position );\n\n\t// When paragraph is allowed in this context...\n\tif ( !schema.checkChild( context, 'paragraph' ) ) {\n\t\treturn false;\n\t}\n\n\t// And a node would be allowed in this paragraph...\n\tif ( !schema.checkChild( context.push( 'paragraph' ), nodeOrType ) ) {\n\t\treturn false;\n\t}\n\n\treturn true;\n}\n\n/**\n * Inserts a new paragraph at the given position and returns a position inside that paragraph.\n *\n * @protected\n * @param {module:engine/model/position~Position} position The position where a paragraph should be inserted.\n * @param {module:engine/model/writer~Writer} writer The model writer.\n * @returns {module:engine/model/position~Position} Position inside the created paragraph.\n */\nexport function wrapInParagraph( position, writer ) {\n\tconst paragraph = writer.createElement( 'paragraph' );\n\n\twriter.insert( paragraph, position );\n\n\treturn writer.createPositionAt( paragraph, 0 );\n}\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\nimport Matcher from '../view/matcher';\nimport ConversionHelpers from './conversionhelpers';\n\nimport { cloneDeep } from 'lodash-es';\nimport { logWarning } from '@ckeditor/ckeditor5-utils/src/ckeditorerror';\n\nimport priorities from '@ckeditor/ckeditor5-utils/src/priorities';\nimport { isParagraphable, wrapInParagraph } from '../model/utils/autoparagraphing';\n\n/**\n * Contains {@link module:engine/view/view view} to {@link module:engine/model/model model} converters for\n * {@link module:engine/conversion/upcastdispatcher~UpcastDispatcher}.\n *\n * @module engine/conversion/upcasthelpers\n */\n\n/**\n * Upcast conversion helper functions.\n *\n * @extends module:engine/conversion/conversionhelpers~ConversionHelpers\n */\nexport default class UpcastHelpers extends ConversionHelpers {\n\t/**\n\t * View element to model element conversion helper.\n\t *\n\t * This conversion results in creating a model element. For example,\n\t * view `<p>Foo</p>` becomes `<paragraph>Foo</paragraph>` in the model.\n\t *\n\t * Keep in mind that the element will be inserted only if it is allowed\n\t * by {@link module:engine/model/schema~Schema schema} configuration.\n\t *\n\t *\t\teditor.conversion.for( 'upcast' ).elementToElement( {\n\t *\t\t\tview: 'p',\n\t *\t\t\tmodel: 'paragraph'\n\t *\t\t} );\n\t *\n\t *\t\teditor.conversion.for( 'upcast' ).elementToElement( {\n\t *\t\t\tview: 'p',\n\t *\t\t\tmodel: 'paragraph',\n\t *\t\t\tconverterPriority: 'high'\n\t *\t\t} );\n\t *\n\t *\t\teditor.conversion.for( 'upcast' ).elementToElement( {\n\t *\t\t\tview: {\n\t *\t\t\t\tname: 'p',\n\t *\t\t\t\tclasses: 'fancy'\n\t *\t\t\t},\n\t *\t\t\tmodel: 'fancyParagraph'\n\t *\t\t} );\n\t *\n\t *\t\teditor.conversion.for( 'upcast' ).elementToElement( {\n\t * \t\t\tview: {\n\t *\t\t\t\tname: 'p',\n\t *\t\t\t\tclasses: 'heading'\n\t * \t\t\t},\n\t * \t\t\tmodel: ( viewElement, conversionApi ) => {\n\t * \t\t\t\tconst modelWriter = conversionApi.writer;\n\t *\n\t * \t\t\t\treturn modelWriter.createElement( 'heading', { level: viewElement.getAttribute( 'data-level' ) } );\n\t * \t\t\t}\n\t * \t\t} );\n\t *\n\t * See {@link module:engine/conversion/conversion~Conversion#for `conversion.for()`} to learn how to add a converter\n\t * to the conversion process.\n\t *\n\t * @method #elementToElement\n\t * @param {Object} config Conversion configuration.\n\t * @param {module:engine/view/matcher~MatcherPattern} [config.view] Pattern matching all view elements which should be converted. If not\n\t * set, the converter will fire for every view element.\n\t * @param {String|module:engine/model/element~Element|Function} config.model Name of the model element, a model element instance or a\n\t * function that takes a view element and {@link module:engine/conversion/upcastdispatcher~UpcastConversionApi upcast conversion API}\n\t * and returns a model element. The model element will be inserted in the model.\n\t * @param {module:utils/priorities~PriorityString} [config.converterPriority='normal'] Converter priority.\n\t * @returns {module:engine/conversion/upcasthelpers~UpcastHelpers}\n\t */\n\telementToElement( config ) {\n\t\treturn this.add( upcastElementToElement( config ) );\n\t}\n\n\t/**\n\t * View element to model attribute conversion helper.\n\t *\n\t * This conversion results in setting an attribute on a model node. For example, view `<strong>Foo</strong>` becomes\n\t * `Foo` {@link module:engine/model/text~Text model text node} with `bold` attribute set to `true`.\n\t *\n\t * This helper is meant to set a model attribute on all the elements that are inside the converted element:\n\t *\n\t *\t\t<strong>Foo</strong>   -->   <strong><p>Foo</p></strong>   -->   <paragraph><$text bold=\"true\">Foo</$text></paragraph>\n\t *\n\t * Above is a sample of HTML code, that goes through autoparagraphing (first step) and then is converted (second step).\n\t * Even though `<strong>` is over `<p>` element, `bold=\"true\"` was added to the text. See\n\t * {@link module:engine/conversion/upcasthelpers~UpcastHelpers#attributeToAttribute} for comparison.\n\t *\n\t * Keep in mind that the attribute will be set only if it is allowed by {@link module:engine/model/schema~Schema schema} configuration.\n\t *\n\t *\t\teditor.conversion.for( 'upcast' ).elementToAttribute( {\n\t *\t\t\tview: 'strong',\n\t *\t\t\tmodel: 'bold'\n\t *\t\t} );\n\t *\n\t *\t\teditor.conversion.for( 'upcast' ).elementToAttribute( {\n\t *\t\t\tview: 'strong',\n\t *\t\t\tmodel: 'bold',\n\t *\t\t\tconverterPriority: 'high'\n\t *\t\t} );\n\t *\n\t *\t\teditor.conversion.for( 'upcast' ).elementToAttribute( {\n\t *\t\t\tview: {\n\t *\t\t\t\tname: 'span',\n\t *\t\t\t\tclasses: 'bold'\n\t *\t\t\t},\n\t *\t\t\tmodel: 'bold'\n\t *\t\t} );\n\t *\n\t *\t\teditor.conversion.for( 'upcast' ).elementToAttribute( {\n\t *\t\t\tview: {\n\t *\t\t\t\tname: 'span',\n\t *\t\t\t\tclasses: [ 'styled', 'styled-dark' ]\n\t *\t\t\t},\n\t *\t\t\tmodel: {\n\t *\t\t\t\tkey: 'styled',\n\t *\t\t\t\tvalue: 'dark'\n\t *\t\t\t}\n\t *\t\t} );\n\t *\n\t * \t\teditor.conversion.for( 'upcast' ).elementToAttribute( {\n\t *\t\t\tview: {\n\t *\t\t\t\tname: 'span',\n\t *\t\t\t\tstyles: {\n\t *\t\t\t\t\t'font-size': /[\\s\\S]+/\n\t *\t\t\t\t}\n\t *\t\t\t},\n\t *\t\t\tmodel: {\n\t *\t\t\t\tkey: 'fontSize',\n\t *\t\t\t\tvalue: ( viewElement, conversionApi ) => {\n\t *\t\t\t\t\tconst fontSize = viewElement.getStyle( 'font-size' );\n\t *\t\t\t\t\tconst value = fontSize.substr( 0, fontSize.length - 2 );\n\t *\n\t *\t\t\t\t\tif ( value <= 10 ) {\n\t *\t\t\t\t\t\treturn 'small';\n\t *\t\t\t\t\t} else if ( value > 12 ) {\n\t *\t\t\t\t\t\treturn 'big';\n\t *\t\t\t\t\t}\n\t *\n\t *\t\t\t\t\treturn null;\n\t *\t\t\t\t}\n\t *\t\t\t}\n\t *\t\t} );\n\t *\n\t * See {@link module:engine/conversion/conversion~Conversion#for `conversion.for()`} to learn how to add a converter\n\t * to the conversion process.\n\t *\n\t * @method #elementToAttribute\n\t * @param {Object} config Conversion configuration.\n\t * @param {module:engine/view/matcher~MatcherPattern} config.view Pattern matching all view elements which should be converted.\n\t * @param {String|Object} config.model Model attribute key or an object with `key` and `value` properties, describing\n\t * the model attribute. `value` property may be set as a function that takes a view element and\n\t * {@link module:engine/conversion/upcastdispatcher~UpcastConversionApi upcast conversion API} and returns the value.\n\t * If `String` is given, the model attribute value will be set to `true`.\n\t * @param {module:utils/priorities~PriorityString} [config.converterPriority='low'] Converter priority.\n\t * @returns {module:engine/conversion/upcasthelpers~UpcastHelpers}\n\t */\n\telementToAttribute( config ) {\n\t\treturn this.add( upcastElementToAttribute( config ) );\n\t}\n\n\t/**\n\t * View attribute to model attribute conversion helper.\n\t *\n\t * This conversion results in setting an attribute on a model node. For example, view `<img src=\"foo.jpg\"></img>` becomes\n\t * `<image source=\"foo.jpg\"></image>` in the model.\n\t *\n\t * This helper is meant to convert view attributes from view elements which got converted to the model, so the view attribute\n\t * is set only on the corresponding model node:\n\t *\n\t *\t\t<div class=\"dark\"><div>foo</div></div>    -->    <div dark=\"true\"><div>foo</div></div>\n\t *\n\t * Above, `class=\"dark\"` attribute is added only to the `<div>` elements that has it. This is in contrary to\n\t * {@link module:engine/conversion/upcasthelpers~UpcastHelpers#elementToAttribute} which sets attributes for\n\t * all the children in the model:\n\t *\n\t *\t\t<strong>Foo</strong>   -->   <strong><p>Foo</p></strong>   -->   <paragraph><$text bold=\"true\">Foo</$text></paragraph>\n\t *\n\t * Above is a sample of HTML code, that goes through autoparagraphing (first step) and then is converted (second step).\n\t * Even though `<strong>` is over `<p>` element, `bold=\"true\"` was added to the text.\n\t *\n\t * Keep in mind that the attribute will be set only if it is allowed by {@link module:engine/model/schema~Schema schema} configuration.\n\t *\n\t *\t\teditor.conversion.for( 'upcast' ).attributeToAttribute( {\n\t *\t\t\tview: 'src',\n\t *\t\t\tmodel: 'source'\n\t *\t\t} );\n\t *\n\t *\t\teditor.conversion.for( 'upcast' ).attributeToAttribute( {\n\t *\t\t\tview: { key: 'src' },\n\t *\t\t\tmodel: 'source'\n\t *\t\t} );\n\t *\n\t *\t\teditor.conversion.for( 'upcast' ).attributeToAttribute( {\n\t *\t\t\tview: { key: 'src' },\n\t *\t\t\tmodel: 'source',\n\t *\t\t\tconverterPriority: 'normal'\n\t *\t\t} );\n\t *\n\t *\t\teditor.conversion.for( 'upcast' ).attributeToAttribute( {\n\t *\t\t\tview: {\n\t *\t\t\t\tkey: 'data-style',\n\t *\t\t\t\tvalue: /[\\s\\S]+/\n\t *\t\t\t},\n\t *\t\t\tmodel: 'styled'\n\t *\t\t} );\n\t *\n\t *\t\teditor.conversion.for( 'upcast' ).attributeToAttribute( {\n\t *\t\t\tview: {\n\t *\t\t\t\tname: 'img',\n\t *\t\t\t\tkey: 'class',\n\t *\t\t\t\tvalue: 'styled-dark'\n\t *\t\t\t},\n\t *\t\t\tmodel: {\n\t *\t\t\t\tkey: 'styled',\n\t *\t\t\t\tvalue: 'dark'\n\t *\t\t\t}\n\t *\t\t} );\n\t *\n\t *\t\teditor.conversion.for( 'upcast' ).attributeToAttribute( {\n\t *\t\t\tview: {\n\t *\t\t\t\tkey: 'class',\n\t *\t\t\t\tvalue: /styled-[\\S]+/\n\t *\t\t\t},\n\t *\t\t\tmodel: {\n\t *\t\t\t\tkey: 'styled'\n\t *\t\t\t\tvalue: ( viewElement, conversionApi ) => {\n\t *\t\t\t\t\tconst regexp = /styled-([\\S]+)/;\n\t *\t\t\t\t\tconst match = viewElement.getAttribute( 'class' ).match( regexp );\n\t *\n\t *\t\t\t\t\treturn match[ 1 ];\n\t *\t\t\t\t}\n\t *\t\t\t}\n\t *\t\t} );\n\t *\n\t * Converting styles works a bit differently as it requires `view.styles` to be an object and by default\n\t * a model attribute will be set to `true` by such a converter. You can set the model attribute to any value by providing the `value`\n\t * callback that returns the desired value.\n\t *\n\t *\t\t// Default conversion of font-weight style will result in setting bold attribute to true.\n\t *\t\teditor.conversion.for( 'upcast' ).attributeToAttribute( {\n\t *\t\t\tview: {\n\t *\t\t\t\tstyles: {\n\t *\t\t\t\t\t'font-weight': 'bold'\n\t *\t\t\t\t}\n\t *\t\t\t},\n\t *\t\t\tmodel: 'bold'\n\t *\t\t} );\n\t *\n\t *\t\t// This converter will pass any style value to the `lineHeight` model attribute.\n\t *\t\teditor.conversion.for( 'upcast' ).attributeToAttribute( {\n\t *\t\t\tview: {\n\t *\t\t\t\tstyles: {\n\t *\t\t\t\t\t'line-height': /[\\s\\S]+/\n\t *\t\t\t\t}\n\t *\t\t\t},\n\t *\t\t\tmodel: {\n\t *\t\t\t\tkey: 'lineHeight',\n\t *\t\t\t\tvalue: ( viewElement, conversionApi ) => viewElement.getStyle( 'line-height' )\n\t *\t\t\t}\n\t *\t\t} );\n\t *\n\t * See {@link module:engine/conversion/conversion~Conversion#for `conversion.for()`} to learn how to add a converter\n\t * to the conversion process.\n\t *\n\t * @method #attributeToAttribute\n\t * @param {Object} config Conversion configuration.\n\t * @param {String|Object} config.view Specifies which view attribute will be converted. If a `String` is passed,\n\t * attributes with given key will be converted. If an `Object` is passed, it must have a required `key` property,\n\t * specifying view attribute key, and may have an optional `value` property, specifying view attribute value and optional `name`\n\t * property specifying a view element name from/on which the attribute should be converted. `value` can be given as a `String`,\n\t * a `RegExp` or a function callback, that takes view attribute value as the only parameter and returns `Boolean`.\n\t * @param {String|Object} config.model Model attribute key or an object with `key` and `value` properties, describing\n\t * the model attribute. `value` property may be set as a function that takes a view element and\n\t * {@link module:engine/conversion/upcastdispatcher~UpcastConversionApi upcast conversion API} and returns the value.\n\t * If `String` is given, the model attribute value will be same as view attribute value.\n\t * @param {module:utils/priorities~PriorityString} [config.converterPriority='low'] Converter priority.\n\t * @returns {module:engine/conversion/upcasthelpers~UpcastHelpers}\n\t */\n\tattributeToAttribute( config ) {\n\t\treturn this.add( upcastAttributeToAttribute( config ) );\n\t}\n\n\t/**\n\t * View element to model marker conversion helper.\n\t *\n\t * **Note**: This method was deprecated. Please use {@link #dataToMarker} instead.\n\t *\n\t * This conversion results in creating a model marker. For example, if the marker was stored in a view as an element:\n\t * `<p>Fo<span data-marker=\"comment\" data-comment-id=\"7\"></span>o</p><p>B<span data-marker=\"comment\" data-comment-id=\"7\"></span>ar</p>`,\n\t * after the conversion is done, the marker will be available in\n\t * {@link module:engine/model/model~Model#markers model document markers}.\n\t *\n\t *\t\teditor.conversion.for( 'upcast' ).elementToMarker( {\n\t *\t\t\tview: 'marker-search',\n\t *\t\t\tmodel: 'search'\n\t *\t\t} );\n\t *\n\t *\t\teditor.conversion.for( 'upcast' ).elementToMarker( {\n\t *\t\t\tview: 'marker-search',\n\t *\t\t\tmodel: 'search',\n\t *\t\t\tconverterPriority: 'high'\n\t *\t\t} );\n\t *\n\t *\t\teditor.conversion.for( 'upcast' ).elementToMarker( {\n\t *\t\t\tview: 'marker-search',\n\t *\t\t\tmodel: ( viewElement, conversionApi ) => 'comment:' + viewElement.getAttribute( 'data-comment-id' )\n\t *\t\t} );\n\t *\n\t *\t\teditor.conversion.for( 'upcast' ).elementToMarker( {\n\t *\t\t\tview: {\n\t *\t\t\t\tname: 'span',\n\t *\t\t\t\tattributes: {\n\t *\t\t\t\t\t'data-marker': 'search'\n\t *\t\t\t\t}\n\t *\t\t\t},\n\t *\t\t\tmodel: 'search'\n\t *\t\t} );\n\t *\n\t * See {@link module:engine/conversion/conversion~Conversion#for `conversion.for()`} to learn how to add a converter\n\t * to the conversion process.\n\t *\n\t * @deprecated\n\t * @method #elementToMarker\n\t * @param {Object} config Conversion configuration.\n\t * @param {module:engine/view/matcher~MatcherPattern} config.view Pattern matching all view elements which should be converted.\n\t * @param {String|Function} config.model Name of the model marker, or a function that takes a view element and returns\n\t * a model marker name.\n\t * @param {module:utils/priorities~PriorityString} [config.converterPriority='normal'] Converter priority.\n\t * @returns {module:engine/conversion/upcasthelpers~UpcastHelpers}\n\t */\n\telementToMarker( config ) {\n\t\t/**\n\t\t * The {@link module:engine/conversion/upcasthelpers~UpcastHelpers#elementToMarker `UpcastHelpers#elementToMarker()`}\n\t\t * method was deprecated and will be removed in the near future.\n\t\t * Please use {@link module:engine/conversion/upcasthelpers~UpcastHelpers#dataToMarker `UpcastHelpers#dataToMarker()`} instead.\n\t\t *\n\t\t * @error upcast-helpers-element-to-marker-deprecated\n\t\t */\n\t\tlogWarning( 'upcast-helpers-element-to-marker-deprecated' );\n\n\t\treturn this.add( upcastElementToMarker( config ) );\n\t}\n\n\t/**\n\t * View-to-model marker conversion helper.\n\t *\n\t * Converts view data created by {@link module:engine/conversion/downcasthelpers~DowncastHelpers#markerToData `#markerToData()`}\n\t * back to a model marker.\n\t *\n\t * This converter looks for specific view elements and view attributes that mark marker boundaries. See\n\t * {@link module:engine/conversion/downcasthelpers~DowncastHelpers#markerToData `#markerToData()`} to learn what view data\n\t * is expected by this converter.\n\t *\n\t * The `config.view` property is equal to the marker group name to convert.\n\t *\n\t * By default, this converter creates markers with the `group:name` name convention (to match the default `markerToData` conversion).\n\t *\n\t * The conversion configuration can take a function that will generate a marker name.\n\t * If such function is set as the `config.model` parameter, it is passed the `name` part from the view element or attribute and it is\n\t * expected to return a string with the marker name.\n\t *\n\t * Basic usage:\n\t *\n\t *\t\t// Using the default conversion.\n\t *\t\t// In this case, all markers from the `comment` group will be converted.\n\t *\t\t// The conversion will look for `<comment-start>` and `<comment-end>` tags and\n\t *\t\t// `data-comment-start-before`, `data-comment-start-after`,\n\t *\t\t// `data-comment-end-before` and `data-comment-end-after` attributes.\n\t *\t\teditor.conversion.for( 'upcast' ).dataToMarker( {\n\t *\t\t\tview: 'comment'\n\t *\t\t} );\n\t *\n\t * An example of a model that may be generated by this conversion:\n\t *\n\t *\t\t// View:\n\t *\t\t<p>Foo<comment-start name=\"commentId:uid\"></comment-start>bar</p>\n\t *\t\t<figure data-comment-end-after=\"commentId:uid\" class=\"image\"><img src=\"abc.jpg\" /></figure>\n\t *\n\t *\t\t// Model:\n\t *\t\t<paragraph>Foo[bar</paragraph>\n\t *\t\t<image src=\"abc.jpg\"></image>]\n\t *\n\t * Where `[]` are boundaries of a marker that will receive the `comment:commentId:uid` name.\n\t *\n\t * Other examples of usage:\n\t *\n\t *\t\t// Using a custom function which is the same as the default conversion:\n\t *\t\teditor.conversion.for( 'upcast' ).dataToMarker( {\n\t *\t\t\tview: 'comment',\n\t *\t\t\tmodel: ( name, conversionApi ) => 'comment:' + name,\n\t *\t\t} );\n\t *\n\t *\t\t// Using the converter priority:\n\t *\t\teditor.conversion.for( 'upcast' ).dataToMarker( {\n\t *\t\t\tview: 'comment',\n\t *\t\t\tmodel: ( name, conversionApi ) => 'comment:' + name,\n\t *\t\t\tconverterPriority: 'high'\n\t *\t\t} );\n\t *\n\t * See {@link module:engine/conversion/conversion~Conversion#for `conversion.for()`} to learn how to add a converter\n\t * to the conversion process.\n\t *\n\t * @method #dataToMarker\n\t * @param {Object} config Conversion configuration.\n\t * @param {String} config.view The marker group name to convert.\n\t * @param {Function} [config.model] A function that takes the `name` part from the view element or attribute and\n\t * {@link module:engine/conversion/upcastdispatcher~UpcastConversionApi upcast conversion API} and returns the marker name.\n\t * @param {module:utils/priorities~PriorityString} [config.converterPriority='normal'] Converter priority.\n\t * @returns {module:engine/conversion/upcasthelpers~UpcastHelpers}\n\t */\n\tdataToMarker( config ) {\n\t\treturn this.add( upcastDataToMarker( config ) );\n\t}\n}\n\n/**\n * Function factory, creates a converter that converts {@link module:engine/view/documentfragment~DocumentFragment view document fragment}\n * or all children of {@link module:engine/view/element~Element} into\n * {@link module:engine/model/documentfragment~DocumentFragment model document fragment}.\n * This is the \"entry-point\" converter for upcast (view to model conversion). This converter starts the conversion of all children\n * of passed view document fragment. Those children {@link module:engine/view/node~Node view nodes} are then handled by other converters.\n *\n * This also a \"default\", last resort converter for all view elements that has not been converted by other converters.\n * When a view element is being converted to the model but it does not have converter specified, that view element\n * will be converted to {@link module:engine/model/documentfragment~DocumentFragment model document fragment} and returned.\n *\n * @returns {Function} Universal converter for view {@link module:engine/view/documentfragment~DocumentFragment fragments} and\n * {@link module:engine/view/element~Element elements} that returns\n * {@link module:engine/model/documentfragment~DocumentFragment model fragment} with children of converted view item.\n */\nexport function convertToModelFragment() {\n\treturn ( evt, data, conversionApi ) => {\n\t\t// Second argument in `consumable.consume` is discarded for ViewDocumentFragment but is needed for ViewElement.\n\t\tif ( !data.modelRange && conversionApi.consumable.consume( data.viewItem, { name: true } ) ) {\n\t\t\tconst { modelRange, modelCursor } = conversionApi.convertChildren( data.viewItem, data.modelCursor );\n\n\t\t\tdata.modelRange = modelRange;\n\t\t\tdata.modelCursor = modelCursor;\n\t\t}\n\t};\n}\n\n/**\n * Function factory, creates a converter that converts {@link module:engine/view/text~Text} to {@link module:engine/model/text~Text}.\n *\n * @returns {Function} {@link module:engine/view/text~Text View text} converter.\n */\nexport function convertText() {\n\treturn ( evt, data, { schema, consumable, writer } ) => {\n\t\tlet position = data.modelCursor;\n\n\t\t// When node is already converted then do nothing.\n\t\tif ( !consumable.test( data.viewItem ) ) {\n\t\t\treturn;\n\t\t}\n\n\t\tif ( !schema.checkChild( position, '$text' ) ) {\n\t\t\tif ( !isParagraphable( position, '$text', schema ) ) {\n\t\t\t\treturn;\n\t\t\t}\n\n\t\t\tposition = wrapInParagraph( position, writer );\n\t\t}\n\n\t\tconsumable.consume( data.viewItem );\n\n\t\tconst text = writer.createText( data.viewItem.data );\n\n\t\twriter.insert( text, position );\n\n\t\tdata.modelRange = writer.createRange(\n\t\t\tposition,\n\t\t\tposition.getShiftedBy( text.offsetSize )\n\t\t);\n\t\tdata.modelCursor = data.modelRange.end;\n\t};\n}\n\n/**\n * Function factory, creates a callback function which converts a {@link module:engine/view/selection~Selection\n * view selection} taken from the {@link module:engine/view/document~Document#event:selectionChange} event\n * and sets in on the {@link module:engine/model/document~Document#selection model}.\n *\n * **Note**: because there is no view selection change dispatcher nor any other advanced view selection to model\n * conversion mechanism, the callback should be set directly on view document.\n *\n *\t\tview.document.on( 'selectionChange', convertSelectionChange( modelDocument, mapper ) );\n *\n * @param {module:engine/model/model~Model} model Data model.\n * @param {module:engine/conversion/mapper~Mapper} mapper Conversion mapper.\n * @returns {Function} {@link module:engine/view/document~Document#event:selectionChange} callback function.\n */\nexport function convertSelectionChange( model, mapper ) {\n\treturn ( evt, data ) => {\n\t\tconst viewSelection = data.newSelection;\n\n\t\tconst ranges = [];\n\n\t\tfor ( const viewRange of viewSelection.getRanges() ) {\n\t\t\tranges.push( mapper.toModelRange( viewRange ) );\n\t\t}\n\n\t\tconst modelSelection = model.createSelection( ranges, { backward: viewSelection.isBackward } );\n\n\t\tif ( !modelSelection.isEqual( model.document.selection ) ) {\n\t\t\tmodel.change( writer => {\n\t\t\t\twriter.setSelection( modelSelection );\n\t\t\t} );\n\t\t}\n\t};\n}\n\n// View element to model element conversion helper.\n//\n// See {@link ~UpcastHelpers#elementToElement `.elementToElement()` upcast helper} for examples.\n//\n// @param {Object} config Conversion configuration.\n// @param {module:engine/view/matcher~MatcherPattern} [config.view] Pattern matching all view elements which should be converted. If not\n// set, the converter will fire for every view element.\n// @param {String|module:engine/model/element~Element|Function} config.model Name of the model element, a model element\n// instance or a function that takes a view element and returns a model element. The model element will be inserted in the model.\n// @param {module:utils/priorities~PriorityString} [config.converterPriority='normal'] Converter priority.\n// @returns {Function} Conversion helper.\nfunction upcastElementToElement( config ) {\n\tconfig = cloneDeep( config );\n\n\tconst converter = prepareToElementConverter( config );\n\n\tconst elementName = getViewElementNameFromConfig( config.view );\n\tconst eventName = elementName ? 'element:' + elementName : 'element';\n\n\treturn dispatcher => {\n\t\tdispatcher.on( eventName, converter, { priority: config.converterPriority || 'normal' } );\n\t};\n}\n\n// View element to model attribute conversion helper.\n//\n// See {@link ~UpcastHelpers#elementToAttribute `.elementToAttribute()` upcast helper} for examples.\n//\n// @param {Object} config Conversion configuration.\n// @param {module:engine/view/matcher~MatcherPattern} config.view Pattern matching all view elements which should be converted.\n// @param {String|Object} config.model Model attribute key or an object with `key` and `value` properties, describing\n// the model attribute. `value` property may be set as a function that takes a view element and returns the value.\n// If `String` is given, the model attribute value will be set to `true`.\n// @param {module:utils/priorities~PriorityString} [config.converterPriority='low'] Converter priority.\n// @returns {Function} Conversion helper.\nfunction upcastElementToAttribute( config ) {\n\tconfig = cloneDeep( config );\n\n\tnormalizeModelAttributeConfig( config );\n\n\tconst converter = prepareToAttributeConverter( config, false );\n\n\tconst elementName = getViewElementNameFromConfig( config.view );\n\tconst eventName = elementName ? 'element:' + elementName : 'element';\n\n\treturn dispatcher => {\n\t\tdispatcher.on( eventName, converter, { priority: config.converterPriority || 'low' } );\n\t};\n}\n\n// View attribute to model attribute conversion helper.\n//\n// See {@link ~UpcastHelpers#attributeToAttribute `.attributeToAttribute()` upcast helper} for examples.\n//\n// @param {Object} config Conversion configuration.\n// @param {String|Object} config.view Specifies which view attribute will be converted. If a `String` is passed,\n// attributes with given key will be converted. If an `Object` is passed, it must have a required `key` property,\n// specifying view attribute key, and may have an optional `value` property, specifying view attribute value and optional `name`\n// property specifying a view element name from/on which the attribute should be converted. `value` can be given as a `String`,\n// a `RegExp` or a function callback, that takes view attribute value as the only parameter and returns `Boolean`.\n// @param {String|Object} config.model Model attribute key or an object with `key` and `value` properties, describing\n// the model attribute. `value` property may be set as a function that takes a view element and returns the value.\n// If `String` is given, the model attribute value will be same as view attribute value.\n// @param {module:utils/priorities~PriorityString} [config.converterPriority='low'] Converter priority.\n// @returns {Function} Conversion helper.\nfunction upcastAttributeToAttribute( config ) {\n\tconfig = cloneDeep( config );\n\n\tlet viewKey = null;\n\n\tif ( typeof config.view == 'string' || config.view.key ) {\n\t\tviewKey = normalizeViewAttributeKeyValueConfig( config );\n\t}\n\n\tnormalizeModelAttributeConfig( config, viewKey );\n\n\tconst converter = prepareToAttributeConverter( config, true );\n\n\treturn dispatcher => {\n\t\tdispatcher.on( 'element', converter, { priority: config.converterPriority || 'low' } );\n\t};\n}\n\n// View element to model marker conversion helper.\n//\n// See {@link ~UpcastHelpers#elementToMarker `.elementToMarker()` upcast helper} for examples.\n//\n// @param {Object} config Conversion configuration.\n// @param {module:engine/view/matcher~MatcherPattern} config.view Pattern matching all view elements which should be converted.\n// @param {String|Function} config.model Name of the model marker, or a function that takes a view element and returns\n// a model marker name.\n// @param {module:utils/priorities~PriorityString} [config.converterPriority='normal'] Converter priority.\n// @returns {Function} Conversion helper.\nfunction upcastElementToMarker( config ) {\n\tconfig = cloneDeep( config );\n\n\tnormalizeElementToMarkerConfig( config );\n\n\treturn upcastElementToElement( config );\n}\n\n// View data to model marker conversion helper.\n//\n// See {@link ~UpcastHelpers#dataToMarker} to learn more.\n//\n// @param {Object} config\n// @param {String} config.view\n// @param {Function} [config.model]\n// @param {module:utils/priorities~PriorityString} [config.converterPriority='normal']\n// @returns {Function} Conversion helper.\nfunction upcastDataToMarker( config ) {\n\tconfig = cloneDeep( config );\n\n\t// Default conversion.\n\tif ( !config.model ) {\n\t\tconfig.model = name => {\n\t\t\treturn name ? config.view + ':' + name : config.view;\n\t\t};\n\t}\n\n\tconst converterStart = prepareToElementConverter( normalizeDataToMarkerConfig( config, 'start' ) );\n\tconst converterEnd = prepareToElementConverter( normalizeDataToMarkerConfig( config, 'end' ) );\n\n\treturn dispatcher => {\n\t\tdispatcher.on( 'element:' + config.view + '-start', converterStart, { priority: config.converterPriority || 'normal' } );\n\t\tdispatcher.on( 'element:' + config.view + '-end', converterEnd, { priority: config.converterPriority || 'normal' } );\n\n\t\t// Below is a hack that is needed to properly handle `converterPriority` for both elements and attributes.\n\t\t// Attribute conversion needs to be performed *after* element conversion.\n\t\t// This converter handles both element conversion and attribute conversion, which means that if a single\n\t\t// `config.converterPriority` is used, it will lead to problems. For example, if `'high'` priority is used,\n\t\t// then attribute conversion will be performed before a lot of element upcast converters.\n\t\t// On the other hand we want to support `config.converterPriority` and overwriting conveters.\n\t\t//\n\t\t// To have it work, we need to do some extra processing for priority for attribute converter.\n\t\t// Priority `'low'` value should be the base value and then we will change it depending on `config.converterPriority` value.\n\t\t//\n\t\t// This hack probably would not be needed if attributes are upcasted separately.\n\t\t//\n\t\tconst basePriority = priorities.get( 'low' );\n\t\tconst maxPriority = priorities.get( 'highest' );\n\t\tconst priorityFactor = priorities.get( config.converterPriority ) / maxPriority; // Number in range [ -1, 1 ].\n\n\t\tdispatcher.on( 'element', upcastAttributeToMarker( config ), { priority: basePriority + priorityFactor } );\n\t};\n}\n\n// Function factory, returns a callback function which converts view attributes to a model marker.\n//\n// The converter looks for elements with `data-group-start-before`, `data-group-start-after`, `data-group-end-before`\n// and `data-group-end-after` attributes and inserts `$marker` model elements before/after those elements.\n// `group` part is specified in `config.view`.\n//\n// @param {Object} config\n// @param {String} config.view\n// @param {Function} [config.model]\n// @returns {Function} Marker converter.\nfunction upcastAttributeToMarker( config ) {\n\treturn ( evt, data, conversionApi ) => {\n\t\tconst attrName = `data-${ config.view }`;\n\n\t\t// This converter wants to add a model element, marking a marker, before/after an element (or maybe even group of elements).\n\t\t// To do that, we can use `data.modelRange` which is set on an element (or a group of elements) that has been upcasted.\n\t\t// But, if the processed view element has not been upcasted yet (it does not have been converted), we need to\n\t\t// fire conversion for its children first, then we will have `data.modelRange` available.\n\t\tif ( !data.modelRange ) {\n\t\t\tdata = Object.assign( data, conversionApi.convertChildren( data.viewItem, data.modelCursor ) );\n\t\t}\n\n\t\tif ( conversionApi.consumable.consume( data.viewItem, { attributes: attrName + '-end-after' } ) ) {\n\t\t\taddMarkerElements( data.modelRange.end, data.viewItem.getAttribute( attrName + '-end-after' ).split( ',' ) );\n\t\t}\n\n\t\tif ( conversionApi.consumable.consume( data.viewItem, { attributes: attrName + '-start-after' } ) ) {\n\t\t\taddMarkerElements( data.modelRange.end, data.viewItem.getAttribute( attrName + '-start-after' ).split( ',' ) );\n\t\t}\n\n\t\tif ( conversionApi.consumable.consume( data.viewItem, { attributes: attrName + '-end-before' } ) ) {\n\t\t\taddMarkerElements( data.modelRange.start, data.viewItem.getAttribute( attrName + '-end-before' ).split( ',' ) );\n\t\t}\n\n\t\tif ( conversionApi.consumable.consume( data.viewItem, { attributes: attrName + '-start-before' } ) ) {\n\t\t\taddMarkerElements( data.modelRange.start, data.viewItem.getAttribute( attrName + '-start-before' ).split( ',' ) );\n\t\t}\n\n\t\tfunction addMarkerElements( position, markerViewNames ) {\n\t\t\tfor ( const markerViewName of markerViewNames ) {\n\t\t\t\tconst markerName = config.model( markerViewName, conversionApi );\n\t\t\t\tconst element = conversionApi.writer.createElement( '$marker', { 'data-name': markerName } );\n\n\t\t\t\tconversionApi.writer.insert( element, position );\n\n\t\t\t\tif ( data.modelCursor.isEqual( position ) ) {\n\t\t\t\t\tdata.modelCursor = data.modelCursor.getShiftedBy( 1 );\n\t\t\t\t} else {\n\t\t\t\t\tdata.modelCursor = data.modelCursor._getTransformedByInsertion( position, 1 );\n\t\t\t\t}\n\n\t\t\t\tdata.modelRange = data.modelRange._getTransformedByInsertion( position, 1 )[ 0 ];\n\t\t\t}\n\t\t}\n\t};\n}\n\n// Helper function for from-view-element conversion. Checks if `config.view` directly specifies converted view element's name\n// and if so, returns it.\n//\n// @param {Object} config Conversion view config.\n// @returns {String|null} View element name or `null` if name is not directly set.\nfunction getViewElementNameFromConfig( viewConfig ) {\n\tif ( typeof viewConfig == 'string' ) {\n\t\treturn viewConfig;\n\t}\n\n\tif ( typeof viewConfig == 'object' && typeof viewConfig.name == 'string' ) {\n\t\treturn viewConfig.name;\n\t}\n\n\treturn null;\n}\n\n// Helper for to-model-element conversion. Takes a config object and returns a proper converter function.\n//\n// @param {Object} config Conversion configuration.\n// @returns {Function} View to model converter.\nfunction prepareToElementConverter( config ) {\n\tconst matcher = new Matcher( config.view );\n\n\treturn ( evt, data, conversionApi ) => {\n\t\tconst matcherResult = matcher.match( data.viewItem );\n\n\t\tif ( !matcherResult ) {\n\t\t\treturn;\n\t\t}\n\n\t\tconst match = matcherResult.match;\n\n\t\t// Force consuming element's name.\n\t\tmatch.name = true;\n\n\t\tif ( !conversionApi.consumable.test( data.viewItem, match ) ) {\n\t\t\treturn;\n\t\t}\n\n\t\tconst modelElement = getModelElement( config.model, data.viewItem, conversionApi );\n\n\t\tif ( !modelElement ) {\n\t\t\treturn;\n\t\t}\n\n\t\tif ( !conversionApi.safeInsert( modelElement, data.modelCursor ) ) {\n\t\t\treturn;\n\t\t}\n\n\t\tconversionApi.consumable.consume( data.viewItem, match );\n\t\tconversionApi.convertChildren( data.viewItem, modelElement );\n\t\tconversionApi.updateConversionResult( modelElement, data );\n\t};\n}\n\n// Helper function for upcasting-to-element converter. Takes the model configuration, the converted view element\n// and a writer instance and returns a model element instance to be inserted in the model.\n//\n// @param {String|Function|module:engine/model/element~Element} model Model conversion configuration.\n// @param {module:engine/view/node~Node} input The converted view node.\n// @param {module:engine/conversion/upcastdispatcher~UpcastConversionApi} conversionApi The upcast conversion API.\nfunction getModelElement( model, input, conversionApi ) {\n\tif ( model instanceof Function ) {\n\t\treturn model( input, conversionApi );\n\t} else {\n\t\treturn conversionApi.writer.createElement( model );\n\t}\n}\n\n// Helper function view-attribute-to-model-attribute helper. Normalizes `config.view` which was set as `String` or\n// as an `Object` with `key`, `value` and `name` properties. Normalized `config.view` has is compatible with\n// {@link module:engine/view/matcher~MatcherPattern}.\n//\n// @param {Object} config Conversion config.\n// @returns {String} Key of the converted view attribute.\nfunction normalizeViewAttributeKeyValueConfig( config ) {\n\tif ( typeof config.view == 'string' ) {\n\t\tconfig.view = { key: config.view };\n\t}\n\n\tconst key = config.view.key;\n\tlet normalized;\n\n\tif ( key == 'class' || key == 'style' ) {\n\t\tconst keyName = key == 'class' ? 'classes' : 'styles';\n\n\t\tnormalized = {\n\t\t\t[ keyName ]: config.view.value\n\t\t};\n\t} else {\n\t\tconst value = typeof config.view.value == 'undefined' ? /[\\s\\S]*/ : config.view.value;\n\n\t\tnormalized = {\n\t\t\tattributes: {\n\t\t\t\t[ key ]: value\n\t\t\t}\n\t\t};\n\t}\n\n\tif ( config.view.name ) {\n\t\tnormalized.name = config.view.name;\n\t}\n\n\tconfig.view = normalized;\n\n\treturn key;\n}\n\n// Helper function that normalizes `config.model` in from-model-attribute conversion. `config.model` can be set\n// as a `String`, an `Object` with only `key` property or an `Object` with `key` and `value` properties. Normalized\n// `config.model` is an `Object` with `key` and `value` properties.\n//\n// @param {Object} config Conversion config.\n// @param {String} viewAttributeKeyToCopy Key of the converted view attribute. If it is set, model attribute value\n// will be equal to view attribute value.\nfunction normalizeModelAttributeConfig( config, viewAttributeKeyToCopy = null ) {\n\tconst defaultModelValue = viewAttributeKeyToCopy === null ? true : viewElement => viewElement.getAttribute( viewAttributeKeyToCopy );\n\n\tconst key = typeof config.model != 'object' ? config.model : config.model.key;\n\tconst value = typeof config.model != 'object' || typeof config.model.value == 'undefined' ? defaultModelValue : config.model.value;\n\n\tconfig.model = { key, value };\n}\n\n// Helper for to-model-attribute conversion. Takes the model attribute name and conversion configuration and returns\n// a proper converter function.\n//\n// @param {String} modelAttributeKey The key of the model attribute to set on a model node.\n// @param {Object|Array.<Object>} config Conversion configuration. It is possible to provide multiple configurations in an array.\n// @param {Boolean} shallow If set to `true` the attribute will be set only on top-level nodes. Otherwise, it will be set\n// on all elements in the range.\nfunction prepareToAttributeConverter( config, shallow ) {\n\tconst matcher = new Matcher( config.view );\n\n\treturn ( evt, data, conversionApi ) => {\n\t\tconst match = matcher.match( data.viewItem );\n\n\t\t// If there is no match, this callback should not do anything.\n\t\tif ( !match ) {\n\t\t\treturn;\n\t\t}\n\n\t\tconst modelKey = config.model.key;\n\t\tconst modelValue = typeof config.model.value == 'function' ?\n\t\t\tconfig.model.value( data.viewItem, conversionApi ) : config.model.value;\n\n\t\t// Do not convert if attribute building function returned falsy value.\n\t\tif ( modelValue === null ) {\n\t\t\treturn;\n\t\t}\n\n\t\tif ( onlyViewNameIsDefined( config.view, data.viewItem ) ) {\n\t\t\tmatch.match.name = true;\n\t\t} else {\n\t\t\t// Do not test or consume `name` consumable.\n\t\t\tdelete match.match.name;\n\t\t}\n\n\t\t// Try to consume appropriate values from consumable values list.\n\t\tif ( !conversionApi.consumable.test( data.viewItem, match.match ) ) {\n\t\t\treturn;\n\t\t}\n\n\t\t// Since we are converting to attribute we need an range on which we will set the attribute.\n\t\t// If the range is not created yet, we will create it.\n\t\tif ( !data.modelRange ) {\n\t\t\t// Convert children and set conversion result as a current data.\n\t\t\tdata = Object.assign( data, conversionApi.convertChildren( data.viewItem, data.modelCursor ) );\n\t\t}\n\n\t\t// Set attribute on current `output`. `Schema` is checked inside this helper function.\n\t\tconst attributeWasSet = setAttributeOn( data.modelRange, { key: modelKey, value: modelValue }, shallow, conversionApi );\n\n\t\tif ( attributeWasSet ) {\n\t\t\tconversionApi.consumable.consume( data.viewItem, match.match );\n\t\t}\n\t};\n}\n\n// Helper function that checks if element name should be consumed in attribute converters.\n//\n// @param {Object} config Conversion view config.\n// @returns {Boolean}\nfunction onlyViewNameIsDefined( viewConfig, viewItem ) {\n\t// https://github.com/ckeditor/ckeditor5-engine/issues/1786\n\tconst configToTest = typeof viewConfig == 'function' ? viewConfig( viewItem ) : viewConfig;\n\n\tif ( typeof configToTest == 'object' && !getViewElementNameFromConfig( configToTest ) ) {\n\t\treturn false;\n\t}\n\n\treturn !configToTest.classes && !configToTest.attributes && !configToTest.styles;\n}\n\n// Helper function for to-model-attribute converter. Sets model attribute on given range. Checks {@link module:engine/model/schema~Schema}\n// to ensure proper model structure.\n//\n// @param {module:engine/model/range~Range} modelRange Model range on which attribute should be set.\n// @param {Object} modelAttribute Model attribute to set.\n// @param {module:engine/conversion/upcastdispatcher~UpcastConversionApi} conversionApi Conversion API.\n// @param {Boolean} shallow If set to `true` the attribute will be set only on top-level nodes. Otherwise, it will be set\n// on all elements in the range.\n// @returns {Boolean} `true` if attribute was set on at least one node from given `modelRange`.\nfunction setAttributeOn( modelRange, modelAttribute, shallow, conversionApi ) {\n\tlet result = false;\n\n\t// Set attribute on each item in range according to Schema.\n\tfor ( const node of Array.from( modelRange.getItems( { shallow } ) ) ) {\n\t\tif ( conversionApi.schema.checkAttribute( node, modelAttribute.key ) ) {\n\t\t\tconversionApi.writer.setAttribute( modelAttribute.key, modelAttribute.value, node );\n\n\t\t\tresult = true;\n\t\t}\n\t}\n\n\treturn result;\n}\n\n// Helper function for upcasting-to-marker conversion. Takes the config in a format requested by `upcastElementToMarker()`\n// function and converts it to a format that is supported by `upcastElementToElement()` function.\n//\n// @param {Object} config Conversion configuration.\nfunction normalizeElementToMarkerConfig( config ) {\n\tconst oldModel = config.model;\n\n\tconfig.model = ( viewElement, conversionApi ) => {\n\t\tconst markerName = typeof oldModel == 'string' ? oldModel : oldModel( viewElement, conversionApi );\n\n\t\treturn conversionApi.writer.createElement( '$marker', { 'data-name': markerName } );\n\t};\n}\n\n// Helper function for upcasting-to-marker conversion. Takes the config in a format requested by `upcastDataToMarker()`\n// function and converts it to a format that is supported by `upcastElementToElement()` function.\n//\n// @param {Object} config Conversion configuration.\nfunction normalizeDataToMarkerConfig( config, type ) {\n\tconst configForElements = {};\n\n\t// Upcast <markerGroup-start> and <markerGroup-end> elements.\n\tconfigForElements.view = config.view + '-' + type;\n\n\tconfigForElements.model = ( viewElement, conversionApi ) => {\n\t\tconst viewName = viewElement.getAttribute( 'name' );\n\t\tconst markerName = config.model( viewName, conversionApi );\n\n\t\treturn conversionApi.writer.createElement( '$marker', { 'data-name': markerName } );\n\t};\n\n\treturn configForElements;\n}\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module engine/controller/editingcontroller\n */\n\nimport RootEditableElement from '../view/rooteditableelement';\nimport View from '../view/view';\nimport Mapper from '../conversion/mapper';\nimport DowncastDispatcher from '../conversion/downcastdispatcher';\nimport { clearAttributes, convertCollapsedSelection, convertRangeSelection, insertText, remove } from '../conversion/downcasthelpers';\n\nimport ObservableMixin from '@ckeditor/ckeditor5-utils/src/observablemixin';\nimport mix from '@ckeditor/ckeditor5-utils/src/mix';\nimport { convertSelectionChange } from '../conversion/upcasthelpers';\n\n// @if CK_DEBUG_ENGINE // const { dumpTrees, initDocumentDumping } = require( '../dev-utils/utils' );\n\n/**\n * Controller for the editing pipeline. The editing pipeline controls {@link ~EditingController#model model} rendering,\n * including selection handling. It also creates the {@link ~EditingController#view view} which builds a\n * browser-independent virtualization over the DOM elements. The editing controller also attaches default converters.\n *\n * @mixes module:utils/observablemixin~ObservableMixin\n */\nexport default class EditingController {\n\t/**\n\t * Creates an editing controller instance.\n\t *\n\t * @param {module:engine/model/model~Model} model Editing model.\n\t * @param {module:engine/view/stylesmap~StylesProcessor} stylesProcessor The styles processor instance.\n\t */\n\tconstructor( model, stylesProcessor ) {\n\t\t/**\n\t\t * Editor model.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:engine/model/model~Model}\n\t\t */\n\t\tthis.model = model;\n\n\t\t/**\n\t\t * Editing view controller.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:engine/view/view~View}\n\t\t */\n\t\tthis.view = new View( stylesProcessor );\n\n\t\t/**\n\t\t * Mapper which describes the model-view binding.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:engine/conversion/mapper~Mapper}\n\t\t */\n\t\tthis.mapper = new Mapper();\n\n\t\t/**\n\t\t * Downcast dispatcher that converts changes from the model to {@link #view the editing view}.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:engine/conversion/downcastdispatcher~DowncastDispatcher} #downcastDispatcher\n\t\t */\n\t\tthis.downcastDispatcher = new DowncastDispatcher( {\n\t\t\tmapper: this.mapper,\n\t\t\tschema: model.schema\n\t\t} );\n\n\t\tconst doc = this.model.document;\n\t\tconst selection = doc.selection;\n\t\tconst markers = this.model.markers;\n\n\t\t// When plugins listen on model changes (on selection change, post fixers, etc.) and change the view as a result of\n\t\t// model's change, they might trigger view rendering before the conversion is completed (e.g. before the selection\n\t\t// is converted). We disable rendering for the length of the outermost model change() block to prevent that.\n\t\t//\n\t\t// See https://github.com/ckeditor/ckeditor5-engine/issues/1528\n\t\tthis.listenTo( this.model, '_beforeChanges', () => {\n\t\t\tthis.view._disableRendering( true );\n\t\t}, { priority: 'highest' } );\n\n\t\tthis.listenTo( this.model, '_afterChanges', () => {\n\t\t\tthis.view._disableRendering( false );\n\t\t}, { priority: 'lowest' } );\n\n\t\t// Whenever model document is changed, convert those changes to the view (using model.Document#differ).\n\t\t// Do it on 'low' priority, so changes are converted after other listeners did their job.\n\t\t// Also convert model selection.\n\t\tthis.listenTo( doc, 'change', () => {\n\t\t\tthis.view.change( writer => {\n\t\t\t\tthis.downcastDispatcher.convertChanges( doc.differ, markers, writer );\n\t\t\t\tthis.downcastDispatcher.convertSelection( selection, markers, writer );\n\t\t\t} );\n\t\t}, { priority: 'low' } );\n\n\t\t// Convert selection from the view to the model when it changes in the view.\n\t\tthis.listenTo( this.view.document, 'selectionChange', convertSelectionChange( this.model, this.mapper ) );\n\n\t\t// Attach default model converters.\n\t\tthis.downcastDispatcher.on( 'insert:$text', insertText(), { priority: 'lowest' } );\n\t\tthis.downcastDispatcher.on( 'remove', remove(), { priority: 'low' } );\n\n\t\t// Attach default model selection converters.\n\t\tthis.downcastDispatcher.on( 'selection', clearAttributes(), { priority: 'low' } );\n\t\tthis.downcastDispatcher.on( 'selection', convertRangeSelection(), { priority: 'low' } );\n\t\tthis.downcastDispatcher.on( 'selection', convertCollapsedSelection(), { priority: 'low' } );\n\n\t\t// Binds {@link module:engine/view/document~Document#roots view roots collection} to\n\t\t// {@link module:engine/model/document~Document#roots model roots collection} so creating\n\t\t// model root automatically creates corresponding view root.\n\t\tthis.view.document.roots.bindTo( this.model.document.roots ).using( root => {\n\t\t\t// $graveyard is a special root that has no reflection in the view.\n\t\t\tif ( root.rootName == '$graveyard' ) {\n\t\t\t\treturn null;\n\t\t\t}\n\n\t\t\tconst viewRoot = new RootEditableElement( this.view.document, root.name );\n\n\t\t\tviewRoot.rootName = root.rootName;\n\t\t\tthis.mapper.bindElements( root, viewRoot );\n\n\t\t\treturn viewRoot;\n\t\t} );\n\n\t\t// @if CK_DEBUG_ENGINE // initDocumentDumping( this.model.document );\n\t\t// @if CK_DEBUG_ENGINE // initDocumentDumping( this.view.document );\n\n\t\t// @if CK_DEBUG_ENGINE // dumpTrees( this.model.document, this.model.document.version );\n\t\t// @if CK_DEBUG_ENGINE // dumpTrees( this.view.document, this.model.document.version );\n\n\t\t// @if CK_DEBUG_ENGINE // this.model.document.on( 'change', () => {\n\t\t// @if CK_DEBUG_ENGINE //\tdumpTrees( this.view.document, this.model.document.version );\n\t\t// @if CK_DEBUG_ENGINE // }, { priority: 'lowest' } );\n\t}\n\n\t/**\n\t * Removes all event listeners attached to the `EditingController`. Destroys all objects created\n\t * by `EditingController` that need to be destroyed.\n\t */\n\tdestroy() {\n\t\tthis.view.destroy();\n\t\tthis.stopListening();\n\t}\n}\n\nmix( EditingController, ObservableMixin );\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module core/commandcollection\n */\n\nimport CKEditorError from '@ckeditor/ckeditor5-utils/src/ckeditorerror';\n\n/**\n * Collection of commands. Its instance is available in {@link module:core/editor/editor~Editor#commands `editor.commands`}.\n */\nexport default class CommandCollection {\n\t/**\n\t * Creates collection instance.\n\t */\n\tconstructor() {\n\t\t/**\n\t\t * Command map.\n\t\t *\n\t\t * @private\n\t\t * @member {Map}\n\t\t */\n\t\tthis._commands = new Map();\n\t}\n\n\t/**\n\t * Registers a new command.\n\t *\n\t * @param {String} commandName The name of the command.\n\t * @param {module:core/command~Command} command\n\t */\n\tadd( commandName, command ) {\n\t\tthis._commands.set( commandName, command );\n\t}\n\n\t/**\n\t * Retrieves a command from the collection.\n\t *\n\t * @param {String} commandName The name of the command.\n\t * @returns {module:core/command~Command}\n\t */\n\tget( commandName ) {\n\t\treturn this._commands.get( commandName );\n\t}\n\n\t/**\n\t * Executes a command.\n\t *\n\t * @param {String} commandName The name of the command.\n\t * @param {*} [...commandParams] Command parameters.\n\t * @returns {*} The value returned by the {@link module:core/command~Command#execute `command.execute()`}.\n\t */\n\texecute( commandName, ...args ) {\n\t\tconst command = this.get( commandName );\n\n\t\tif ( !command ) {\n\t\t\t/**\n\t\t\t * Command does not exist.\n\t\t\t *\n\t\t\t * @error commandcollection-command-not-found\n\t\t\t * @param {String} commandName Name of the command.\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'commandcollection-command-not-found', this, { commandName } );\n\t\t}\n\n\t\treturn command.execute( ...args );\n\t}\n\n\t/**\n\t * Returns iterator of command names.\n\t *\n\t * @returns {Iterable.<String>}\n\t */\n\t* names() {\n\t\tyield* this._commands.keys();\n\t}\n\n\t/**\n\t * Returns iterator of command instances.\n\t *\n\t * @returns {Iterable.<module:core/command~Command>}\n\t */\n\t* commands() {\n\t\tyield* this._commands.values();\n\t}\n\n\t/**\n\t * Iterable interface.\n\t *\n\t * Returns `[ commandName, commandInstance ]` pairs.\n\t *\n\t * @returns {Iterable.<Array>}\n\t */\n\t[ Symbol.iterator ]() {\n\t\treturn this._commands[ Symbol.iterator ]();\n\t}\n\n\t/**\n\t * Destroys all collection commands.\n\t */\n\tdestroy() {\n\t\tfor ( const command of this.commands() ) {\n\t\t\tcommand.destroy();\n\t\t}\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module engine/conversion/viewconsumable\n */\n\nimport { isArray } from 'lodash-es';\nimport CKEditorError from '@ckeditor/ckeditor5-utils/src/ckeditorerror';\n\n/**\n * Class used for handling consumption of view {@link module:engine/view/element~Element elements},\n * {@link module:engine/view/text~Text text nodes} and {@link module:engine/view/documentfragment~DocumentFragment document fragments}.\n * Element's name and its parts (attributes, classes and styles) can be consumed separately. Consuming an element's name\n * does not consume its attributes, classes and styles.\n * To add items for consumption use {@link module:engine/conversion/viewconsumable~ViewConsumable#add add method}.\n * To test items use {@link module:engine/conversion/viewconsumable~ViewConsumable#test test method}.\n * To consume items use {@link module:engine/conversion/viewconsumable~ViewConsumable#consume consume method}.\n * To revert already consumed items use {@link module:engine/conversion/viewconsumable~ViewConsumable#revert revert method}.\n *\n *\t\tviewConsumable.add( element, { name: true } ); // Adds element's name as ready to be consumed.\n *\t\tviewConsumable.add( textNode ); // Adds text node for consumption.\n *\t\tviewConsumable.add( docFragment ); // Adds document fragment for consumption.\n *\t\tviewConsumable.test( element, { name: true }  ); // Tests if element's name can be consumed.\n *\t\tviewConsumable.test( textNode ); // Tests if text node can be consumed.\n *\t\tviewConsumable.test( docFragment ); // Tests if document fragment can be consumed.\n *\t\tviewConsumable.consume( element, { name: true }  ); // Consume element's name.\n *\t\tviewConsumable.consume( textNode ); // Consume text node.\n *\t\tviewConsumable.consume( docFragment ); // Consume document fragment.\n *\t\tviewConsumable.revert( element, { name: true }  ); // Revert already consumed element's name.\n *\t\tviewConsumable.revert( textNode ); // Revert already consumed text node.\n *\t\tviewConsumable.revert( docFragment ); // Revert already consumed document fragment.\n */\nexport default class ViewConsumable {\n\t/**\n\t * Creates new ViewConsumable.\n\t */\n\tconstructor() {\n\t\t/**\n\t\t * Map of consumable elements. If {@link module:engine/view/element~Element element} is used as a key,\n\t\t * {@link module:engine/conversion/viewconsumable~ViewElementConsumables ViewElementConsumables} instance is stored as value.\n\t\t * For {@link module:engine/view/text~Text text nodes} and\n\t\t * {@link module:engine/view/documentfragment~DocumentFragment document fragments} boolean value is stored as value.\n\t\t *\n\t\t * @protected\n\t\t * @member {Map.<module:engine/conversion/viewconsumable~ViewElementConsumables|Boolean>}\n\t\t*/\n\t\tthis._consumables = new Map();\n\t}\n\n\t/**\n\t * Adds {@link module:engine/view/element~Element view element}, {@link module:engine/view/text~Text text node} or\n\t * {@link module:engine/view/documentfragment~DocumentFragment document fragment} as ready to be consumed.\n\t *\n\t *\t\tviewConsumable.add( p, { name: true } ); // Adds element's name to consume.\n\t *\t\tviewConsumable.add( p, { attributes: 'name' } ); // Adds element's attribute.\n\t *\t\tviewConsumable.add( p, { classes: 'foobar' } ); // Adds element's class.\n\t *\t\tviewConsumable.add( p, { styles: 'color' } ); // Adds element's style\n\t *\t\tviewConsumable.add( p, { attributes: 'name', styles: 'color' } ); // Adds attribute and style.\n\t *\t\tviewConsumable.add( p, { classes: [ 'baz', 'bar' ] } ); // Multiple consumables can be provided.\n\t *\t\tviewConsumable.add( textNode ); // Adds text node to consume.\n\t *\t\tviewConsumable.add( docFragment ); // Adds document fragment to consume.\n\t *\n\t * Throws {@link module:utils/ckeditorerror~CKEditorError CKEditorError} `viewconsumable-invalid-attribute` when `class` or `style`\n\t * attribute is provided - it should be handled separately by providing actual style/class.\n\t *\n\t *\t\tviewConsumable.add( p, { attributes: 'style' } ); // This call will throw an exception.\n\t *\t\tviewConsumable.add( p, { styles: 'color' } ); // This is properly handled style.\n\t *\n\t * @param {module:engine/view/element~Element|module:engine/view/text~Text|module:engine/view/documentfragment~DocumentFragment} element\n\t * @param {Object} [consumables] Used only if first parameter is {@link module:engine/view/element~Element view element} instance.\n\t * @param {Boolean} consumables.name If set to true element's name will be included.\n\t * @param {String|Array.<String>} consumables.attributes Attribute name or array of attribute names.\n\t * @param {String|Array.<String>} consumables.classes Class name or array of class names.\n\t * @param {String|Array.<String>} consumables.styles Style name or array of style names.\n\t */\n\tadd( element, consumables ) {\n\t\tlet elementConsumables;\n\n\t\t// For text nodes and document fragments just mark them as consumable.\n\t\tif ( element.is( '$text' ) || element.is( 'documentFragment' ) ) {\n\t\t\tthis._consumables.set( element, true );\n\n\t\t\treturn;\n\t\t}\n\n\t\t// For elements create new ViewElementConsumables or update already existing one.\n\t\tif ( !this._consumables.has( element ) ) {\n\t\t\telementConsumables = new ViewElementConsumables( element );\n\t\t\tthis._consumables.set( element, elementConsumables );\n\t\t} else {\n\t\t\telementConsumables = this._consumables.get( element );\n\t\t}\n\n\t\telementConsumables.add( consumables );\n\t}\n\n\t/**\n\t * Tests if {@link module:engine/view/element~Element view element}, {@link module:engine/view/text~Text text node} or\n\t * {@link module:engine/view/documentfragment~DocumentFragment document fragment} can be consumed.\n\t * It returns `true` when all items included in method's call can be consumed. Returns `false` when\n\t * first already consumed item is found and `null` when first non-consumable item is found.\n\t *\n\t *\t\tviewConsumable.test( p, { name: true } ); // Tests element's name.\n\t *\t\tviewConsumable.test( p, { attributes: 'name' } ); // Tests attribute.\n\t *\t\tviewConsumable.test( p, { classes: 'foobar' } ); // Tests class.\n\t *\t\tviewConsumable.test( p, { styles: 'color' } ); // Tests style.\n\t *\t\tviewConsumable.test( p, { attributes: 'name', styles: 'color' } ); // Tests attribute and style.\n\t *\t\tviewConsumable.test( p, { classes: [ 'baz', 'bar' ] } ); // Multiple consumables can be tested.\n\t *\t\tviewConsumable.test( textNode ); // Tests text node.\n\t *\t\tviewConsumable.test( docFragment ); // Tests document fragment.\n\t *\n\t * Testing classes and styles as attribute will test if all added classes/styles can be consumed.\n\t *\n\t *\t\tviewConsumable.test( p, { attributes: 'class' } ); // Tests if all added classes can be consumed.\n\t *\t\tviewConsumable.test( p, { attributes: 'style' } ); // Tests if all added styles can be consumed.\n\t *\n\t * @param {module:engine/view/element~Element|module:engine/view/text~Text|module:engine/view/documentfragment~DocumentFragment} element\n\t * @param {Object} [consumables] Used only if first parameter is {@link module:engine/view/element~Element view element} instance.\n\t * @param {Boolean} consumables.name If set to true element's name will be included.\n\t * @param {String|Array.<String>} consumables.attributes Attribute name or array of attribute names.\n\t * @param {String|Array.<String>} consumables.classes Class name or array of class names.\n\t * @param {String|Array.<String>} consumables.styles Style name or array of style names.\n\t * @returns {Boolean|null} Returns `true` when all items included in method's call can be consumed. Returns `false`\n\t * when first already consumed item is found and `null` when first non-consumable item is found.\n\t */\n\ttest( element, consumables ) {\n\t\tconst elementConsumables = this._consumables.get( element );\n\n\t\tif ( elementConsumables === undefined ) {\n\t\t\treturn null;\n\t\t}\n\n\t\t// For text nodes and document fragments return stored boolean value.\n\t\tif ( element.is( '$text' ) || element.is( 'documentFragment' ) ) {\n\t\t\treturn elementConsumables;\n\t\t}\n\n\t\t// For elements test consumables object.\n\t\treturn elementConsumables.test( consumables );\n\t}\n\n\t/**\n\t * Consumes {@link module:engine/view/element~Element view element}, {@link module:engine/view/text~Text text node} or\n\t * {@link module:engine/view/documentfragment~DocumentFragment document fragment}.\n\t * It returns `true` when all items included in method's call can be consumed, otherwise returns `false`.\n\t *\n\t *\t\tviewConsumable.consume( p, { name: true } ); // Consumes element's name.\n\t *\t\tviewConsumable.consume( p, { attributes: 'name' } ); // Consumes element's attribute.\n\t *\t\tviewConsumable.consume( p, { classes: 'foobar' } ); // Consumes element's class.\n\t *\t\tviewConsumable.consume( p, { styles: 'color' } ); // Consumes element's style.\n\t *\t\tviewConsumable.consume( p, { attributes: 'name', styles: 'color' } ); // Consumes attribute and style.\n\t *\t\tviewConsumable.consume( p, { classes: [ 'baz', 'bar' ] } ); // Multiple consumables can be consumed.\n\t *\t\tviewConsumable.consume( textNode ); // Consumes text node.\n\t *\t\tviewConsumable.consume( docFragment ); // Consumes document fragment.\n\t *\n\t * Consuming classes and styles as attribute will test if all added classes/styles can be consumed.\n\t *\n\t *\t\tviewConsumable.consume( p, { attributes: 'class' } ); // Consume only if all added classes can be consumed.\n\t *\t\tviewConsumable.consume( p, { attributes: 'style' } ); // Consume only if all added styles can be consumed.\n\t *\n\t * @param {module:engine/view/element~Element|module:engine/view/text~Text|module:engine/view/documentfragment~DocumentFragment} element\n\t * @param {Object} [consumables] Used only if first parameter is {@link module:engine/view/element~Element view element} instance.\n\t * @param {Boolean} consumables.name If set to true element's name will be included.\n\t * @param {String|Array.<String>} consumables.attributes Attribute name or array of attribute names.\n\t * @param {String|Array.<String>} consumables.classes Class name or array of class names.\n\t * @param {String|Array.<String>} consumables.styles Style name or array of style names.\n\t * @returns {Boolean} Returns `true` when all items included in method's call can be consumed,\n\t * otherwise returns `false`.\n\t */\n\tconsume( element, consumables ) {\n\t\tif ( this.test( element, consumables ) ) {\n\t\t\tif ( element.is( '$text' ) || element.is( 'documentFragment' ) ) {\n\t\t\t\t// For text nodes and document fragments set value to false.\n\t\t\t\tthis._consumables.set( element, false );\n\t\t\t} else {\n\t\t\t\t// For elements - consume consumables object.\n\t\t\t\tthis._consumables.get( element ).consume( consumables );\n\t\t\t}\n\n\t\t\treturn true;\n\t\t}\n\n\t\treturn false;\n\t}\n\n\t/**\n\t * Reverts {@link module:engine/view/element~Element view element}, {@link module:engine/view/text~Text text node} or\n\t * {@link module:engine/view/documentfragment~DocumentFragment document fragment} so they can be consumed once again.\n\t * Method does not revert items that were never previously added for consumption, even if they are included in\n\t * method's call.\n\t *\n\t *\t\tviewConsumable.revert( p, { name: true } ); // Reverts element's name.\n\t *\t\tviewConsumable.revert( p, { attributes: 'name' } ); // Reverts element's attribute.\n\t *\t\tviewConsumable.revert( p, { classes: 'foobar' } ); // Reverts element's class.\n\t *\t\tviewConsumable.revert( p, { styles: 'color' } ); // Reverts element's style.\n\t *\t\tviewConsumable.revert( p, { attributes: 'name', styles: 'color' } ); // Reverts attribute and style.\n\t *\t\tviewConsumable.revert( p, { classes: [ 'baz', 'bar' ] } ); // Multiple names can be reverted.\n\t *\t\tviewConsumable.revert( textNode ); // Reverts text node.\n\t *\t\tviewConsumable.revert( docFragment ); // Reverts document fragment.\n\t *\n\t * Reverting classes and styles as attribute will revert all classes/styles that were previously added for\n\t * consumption.\n\t *\n\t *\t\tviewConsumable.revert( p, { attributes: 'class' } ); // Reverts all classes added for consumption.\n\t *\t\tviewConsumable.revert( p, { attributes: 'style' } ); // Reverts all styles added for consumption.\n\t *\n\t * @param {module:engine/view/element~Element|module:engine/view/text~Text|module:engine/view/documentfragment~DocumentFragment} element\n\t * @param {Object} [consumables] Used only if first parameter is {@link module:engine/view/element~Element view element} instance.\n\t * @param {Boolean} consumables.name If set to true element's name will be included.\n\t * @param {String|Array.<String>} consumables.attributes Attribute name or array of attribute names.\n\t * @param {String|Array.<String>} consumables.classes Class name or array of class names.\n\t * @param {String|Array.<String>} consumables.styles Style name or array of style names.\n\t */\n\trevert( element, consumables ) {\n\t\tconst elementConsumables = this._consumables.get( element );\n\n\t\tif ( elementConsumables !== undefined ) {\n\t\t\tif ( element.is( '$text' ) || element.is( 'documentFragment' ) ) {\n\t\t\t\t// For text nodes and document fragments - set consumable to true.\n\t\t\t\tthis._consumables.set( element, true );\n\t\t\t} else {\n\t\t\t\t// For elements - revert items from consumables object.\n\t\t\t\telementConsumables.revert( consumables );\n\t\t\t}\n\t\t}\n\t}\n\n\t/**\n\t * Creates consumable object from {@link module:engine/view/element~Element view element}. Consumable object will include\n\t * element's name and all its attributes, classes and styles.\n\t *\n\t * @static\n\t * @param {module:engine/view/element~Element} element\n\t * @returns {Object} consumables\n\t */\n\tstatic consumablesFromElement( element ) {\n\t\tconst consumables = {\n\t\t\telement,\n\t\t\tname: true,\n\t\t\tattributes: [],\n\t\t\tclasses: [],\n\t\t\tstyles: []\n\t\t};\n\n\t\tconst attributes = element.getAttributeKeys();\n\n\t\tfor ( const attribute of attributes ) {\n\t\t\t// Skip classes and styles - will be added separately.\n\t\t\tif ( attribute == 'style' || attribute == 'class' ) {\n\t\t\t\tcontinue;\n\t\t\t}\n\n\t\t\tconsumables.attributes.push( attribute );\n\t\t}\n\n\t\tconst classes = element.getClassNames();\n\n\t\tfor ( const className of classes ) {\n\t\t\tconsumables.classes.push( className );\n\t\t}\n\n\t\tconst styles = element.getStyleNames();\n\n\t\tfor ( const style of styles ) {\n\t\t\tconsumables.styles.push( style );\n\t\t}\n\n\t\treturn consumables;\n\t}\n\n\t/**\n\t * Creates {@link module:engine/conversion/viewconsumable~ViewConsumable ViewConsumable} instance from\n\t * {@link module:engine/view/node~Node node} or {@link module:engine/view/documentfragment~DocumentFragment document fragment}.\n\t * Instance will contain all elements, child nodes, attributes, styles and classes added for consumption.\n\t *\n\t * @static\n\t * @param {module:engine/view/node~Node|module:engine/view/documentfragment~DocumentFragment} from View node or document fragment\n\t * from which `ViewConsumable` will be created.\n\t * @param {module:engine/conversion/viewconsumable~ViewConsumable} [instance] If provided, given `ViewConsumable` instance will be used\n\t * to add all consumables. It will be returned instead of a new instance.\n\t */\n\tstatic createFrom( from, instance ) {\n\t\tif ( !instance ) {\n\t\t\tinstance = new ViewConsumable( from );\n\t\t}\n\n\t\tif ( from.is( '$text' ) ) {\n\t\t\tinstance.add( from );\n\n\t\t\treturn instance;\n\t\t}\n\n\t\t// Add `from` itself, if it is an element.\n\t\tif ( from.is( 'element' ) ) {\n\t\t\tinstance.add( from, ViewConsumable.consumablesFromElement( from ) );\n\t\t}\n\n\t\tif ( from.is( 'documentFragment' ) ) {\n\t\t\tinstance.add( from );\n\t\t}\n\n\t\tfor ( const child of from.getChildren() ) {\n\t\t\tinstance = ViewConsumable.createFrom( child, instance );\n\t\t}\n\n\t\treturn instance;\n\t}\n}\n\n/**\n * This is a private helper-class for {@link module:engine/conversion/viewconsumable~ViewConsumable}.\n * It represents and manipulates consumable parts of a single {@link module:engine/view/element~Element}.\n *\n * @private\n */\nclass ViewElementConsumables {\n\t/**\n\t * Creates ViewElementConsumables instance.\n\t *\n\t * @param {module:engine/view/node~Node|module:engine/view/documentfragment~DocumentFragment} from View node or document fragment\n\t * from which `ViewElementConsumables` is being created.\n\t */\n\tconstructor( from ) {\n\t\t/**\n\t\t * @readonly\n\t\t * @member {module:engine/view/node~Node|module:engine/view/documentfragment~DocumentFragment}\n\t\t */\n\t\tthis.element = from;\n\n\t\t/**\n\t\t * Flag indicating if name of the element can be consumed.\n\t\t *\n\t\t * @private\n\t\t * @member {Boolean}\n\t\t */\n\t\tthis._canConsumeName = null;\n\n\t\t/**\n\t\t * Contains maps of element's consumables: attributes, classes and styles.\n\t\t *\n\t\t * @private\n\t\t * @member {Object}\n\t\t */\n\t\tthis._consumables = {\n\t\t\tattributes: new Map(),\n\t\t\tstyles: new Map(),\n\t\t\tclasses: new Map()\n\t\t};\n\t}\n\n\t/**\n\t * Adds consumable parts of the {@link module:engine/view/element~Element view element}.\n\t * Element's name itself can be marked to be consumed (when element's name is consumed its attributes, classes and\n\t * styles still could be consumed):\n\t *\n\t *\t\tconsumables.add( { name: true } );\n\t *\n\t * Attributes classes and styles:\n\t *\n\t *\t\tconsumables.add( { attributes: 'title', classes: 'foo', styles: 'color' } );\n\t *\t\tconsumables.add( { attributes: [ 'title', 'name' ], classes: [ 'foo', 'bar' ] );\n\t *\n\t * Throws {@link module:utils/ckeditorerror~CKEditorError CKEditorError} `viewconsumable-invalid-attribute` when `class` or `style`\n\t * attribute is provided - it should be handled separately by providing `style` and `class` in consumables object.\n\t *\n\t * @param {Object} consumables Object describing which parts of the element can be consumed.\n\t * @param {Boolean} consumables.name If set to `true` element's name will be added as consumable.\n\t * @param {String|Array.<String>} consumables.attributes Attribute name or array of attribute names to add as consumable.\n\t * @param {String|Array.<String>} consumables.classes Class name or array of class names to add as consumable.\n\t * @param {String|Array.<String>} consumables.styles Style name or array of style names to add as consumable.\n\t */\n\tadd( consumables ) {\n\t\tif ( consumables.name ) {\n\t\t\tthis._canConsumeName = true;\n\t\t}\n\n\t\tfor ( const type in this._consumables ) {\n\t\t\tif ( type in consumables ) {\n\t\t\t\tthis._add( type, consumables[ type ] );\n\t\t\t}\n\t\t}\n\t}\n\n\t/**\n\t * Tests if parts of the {@link module:engine/view/node~Node view node} can be consumed.\n\t *\n\t * Element's name can be tested:\n\t *\n\t *\t\tconsumables.test( { name: true } );\n\t *\n\t * Attributes classes and styles:\n\t *\n\t *\t\tconsumables.test( { attributes: 'title', classes: 'foo', styles: 'color' } );\n\t *\t\tconsumables.test( { attributes: [ 'title', 'name' ], classes: [ 'foo', 'bar' ] );\n\t *\n\t * @param {Object} consumables Object describing which parts of the element should be tested.\n\t * @param {Boolean} consumables.name If set to `true` element's name will be tested.\n\t * @param {String|Array.<String>} consumables.attributes Attribute name or array of attribute names to test.\n\t * @param {String|Array.<String>} consumables.classes Class name or array of class names to test.\n\t * @param {String|Array.<String>} consumables.styles Style name or array of style names to test.\n\t * @returns {Boolean|null} `true` when all tested items can be consumed, `null` when even one of the items\n\t * was never marked for consumption and `false` when even one of the items was already consumed.\n\t */\n\ttest( consumables ) {\n\t\t// Check if name can be consumed.\n\t\tif ( consumables.name && !this._canConsumeName ) {\n\t\t\treturn this._canConsumeName;\n\t\t}\n\n\t\tfor ( const type in this._consumables ) {\n\t\t\tif ( type in consumables ) {\n\t\t\t\tconst value = this._test( type, consumables[ type ] );\n\n\t\t\t\tif ( value !== true ) {\n\t\t\t\t\treturn value;\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\n\t\t// Return true only if all can be consumed.\n\t\treturn true;\n\t}\n\n\t/**\n\t * Consumes parts of {@link module:engine/view/element~Element view element}. This function does not check if consumable item\n\t * is already consumed - it consumes all consumable items provided.\n\t * Element's name can be consumed:\n\t *\n\t *\t\tconsumables.consume( { name: true } );\n\t *\n\t * Attributes classes and styles:\n\t *\n\t *\t\tconsumables.consume( { attributes: 'title', classes: 'foo', styles: 'color' } );\n\t *\t\tconsumables.consume( { attributes: [ 'title', 'name' ], classes: [ 'foo', 'bar' ] );\n\t *\n\t * @param {Object} consumables Object describing which parts of the element should be consumed.\n\t * @param {Boolean} consumables.name If set to `true` element's name will be consumed.\n\t * @param {String|Array.<String>} consumables.attributes Attribute name or array of attribute names to consume.\n\t * @param {String|Array.<String>} consumables.classes Class name or array of class names to consume.\n\t * @param {String|Array.<String>} consumables.styles Style name or array of style names to consume.\n\t */\n\tconsume( consumables ) {\n\t\tif ( consumables.name ) {\n\t\t\tthis._canConsumeName = false;\n\t\t}\n\n\t\tfor ( const type in this._consumables ) {\n\t\t\tif ( type in consumables ) {\n\t\t\t\tthis._consume( type, consumables[ type ] );\n\t\t\t}\n\t\t}\n\t}\n\n\t/**\n\t * Revert already consumed parts of {@link module:engine/view/element~Element view Element}, so they can be consumed once again.\n\t * Element's name can be reverted:\n\t *\n\t *\t\tconsumables.revert( { name: true } );\n\t *\n\t * Attributes classes and styles:\n\t *\n\t *\t\tconsumables.revert( { attributes: 'title', classes: 'foo', styles: 'color' } );\n\t *\t\tconsumables.revert( { attributes: [ 'title', 'name' ], classes: [ 'foo', 'bar' ] );\n\t *\n\t * @param {Object} consumables Object describing which parts of the element should be reverted.\n\t * @param {Boolean} consumables.name If set to `true` element's name will be reverted.\n\t * @param {String|Array.<String>} consumables.attributes Attribute name or array of attribute names to revert.\n\t * @param {String|Array.<String>} consumables.classes Class name or array of class names to revert.\n\t * @param {String|Array.<String>} consumables.styles Style name or array of style names to revert.\n\t */\n\trevert( consumables ) {\n\t\tif ( consumables.name ) {\n\t\t\tthis._canConsumeName = true;\n\t\t}\n\n\t\tfor ( const type in this._consumables ) {\n\t\t\tif ( type in consumables ) {\n\t\t\t\tthis._revert( type, consumables[ type ] );\n\t\t\t}\n\t\t}\n\t}\n\n\t/**\n\t * Helper method that adds consumables of a given type: attribute, class or style.\n\t *\n\t * Throws {@link module:utils/ckeditorerror~CKEditorError CKEditorError} `viewconsumable-invalid-attribute` when `class` or `style`\n\t * type is provided - it should be handled separately by providing actual style/class type.\n\t *\n\t * @private\n\t * @param {String} type Type of the consumable item: `attributes`, `classes` or `styles`.\n\t * @param {String|Array.<String>} item Consumable item or array of items.\n\t */\n\t_add( type, item ) {\n\t\tconst items = isArray( item ) ? item : [ item ];\n\t\tconst consumables = this._consumables[ type ];\n\n\t\tfor ( const name of items ) {\n\t\t\tif ( type === 'attributes' && ( name === 'class' || name === 'style' ) ) {\n\t\t\t\t/**\n\t\t\t\t * Class and style attributes should be handled separately in\n\t\t\t\t * {@link module:engine/conversion/viewconsumable~ViewConsumable#add `ViewConsumable#add()`}.\n\t\t\t\t *\n\t\t\t\t * What you have done is trying to use:\n\t\t\t\t *\n\t\t\t\t *\t\tconsumables.add( { attributes: [ 'class', 'style' ] } );\n\t\t\t\t *\n\t\t\t\t * While each class and style should be registered separately:\n\t\t\t\t *\n\t\t\t\t *\t\tconsumables.add( { classes: 'some-class', styles: 'font-weight' } );\n\t\t\t\t *\n\t\t\t\t * @error viewconsumable-invalid-attribute\n\t\t\t\t */\n\t\t\t\tthrow new CKEditorError( 'viewconsumable-invalid-attribute', this );\n\t\t\t}\n\n\t\t\tconsumables.set( name, true );\n\n\t\t\tif ( type === 'styles' ) {\n\t\t\t\tfor ( const alsoName of this.element.document.stylesProcessor.getRelatedStyles( name ) ) {\n\t\t\t\t\tconsumables.set( alsoName, true );\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\t}\n\n\t/**\n\t * Helper method that tests consumables of a given type: attribute, class or style.\n\t *\n\t * @private\n\t * @param {String} type Type of the consumable item: `attributes`, `classes` or `styles`.\n\t * @param {String|Array.<String>} item Consumable item or array of items.\n\t * @returns {Boolean|null} Returns `true` if all items can be consumed, `null` when one of the items cannot be\n\t * consumed and `false` when one of the items is already consumed.\n\t */\n\t_test( type, item ) {\n\t\tconst items = isArray( item ) ? item : [ item ];\n\t\tconst consumables = this._consumables[ type ];\n\n\t\tfor ( const name of items ) {\n\t\t\tif ( type === 'attributes' && ( name === 'class' || name === 'style' ) ) {\n\t\t\t\tconst consumableName = name == 'class' ? 'classes' : 'styles';\n\n\t\t\t\t// Check all classes/styles if class/style attribute is tested.\n\t\t\t\tconst value = this._test( consumableName, [ ...this._consumables[ consumableName ].keys() ] );\n\n\t\t\t\tif ( value !== true ) {\n\t\t\t\t\treturn value;\n\t\t\t\t}\n\t\t\t} else {\n\t\t\t\tconst value = consumables.get( name );\n\t\t\t\t// Return null if attribute is not found.\n\t\t\t\tif ( value === undefined ) {\n\t\t\t\t\treturn null;\n\t\t\t\t}\n\n\t\t\t\tif ( !value ) {\n\t\t\t\t\treturn false;\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\n\t\treturn true;\n\t}\n\n\t/**\n\t * Helper method that consumes items of a given type: attribute, class or style.\n\t *\n\t * @private\n\t * @param {String} type Type of the consumable item: `attributes`, `classes` or `styles`.\n\t * @param {String|Array.<String>} item Consumable item or array of items.\n\t */\n\t_consume( type, item ) {\n\t\tconst items = isArray( item ) ? item : [ item ];\n\t\tconst consumables = this._consumables[ type ];\n\n\t\tfor ( const name of items ) {\n\t\t\tif ( type === 'attributes' && ( name === 'class' || name === 'style' ) ) {\n\t\t\t\tconst consumableName = name == 'class' ? 'classes' : 'styles';\n\n\t\t\t\t// If class or style is provided for consumption - consume them all.\n\t\t\t\tthis._consume( consumableName, [ ...this._consumables[ consumableName ].keys() ] );\n\t\t\t} else {\n\t\t\t\tconsumables.set( name, false );\n\n\t\t\t\tif ( type == 'styles' ) {\n\t\t\t\t\tfor ( const toConsume of this.element.document.stylesProcessor.getRelatedStyles( name ) ) {\n\t\t\t\t\t\tconsumables.set( toConsume, false );\n\t\t\t\t\t}\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\t}\n\n\t/**\n\t * Helper method that reverts items of a given type: attribute, class or style.\n\t *\n\t * @private\n\t * @param {String} type Type of the consumable item: `attributes`, `classes` or , `styles`.\n\t * @param {String|Array.<String>} item Consumable item or array of items.\n\t */\n\t_revert( type, item ) {\n\t\tconst items = isArray( item ) ? item : [ item ];\n\t\tconst consumables = this._consumables[ type ];\n\n\t\tfor ( const name of items ) {\n\t\t\tif ( type === 'attributes' && ( name === 'class' || name === 'style' ) ) {\n\t\t\t\tconst consumableName = name == 'class' ? 'classes' : 'styles';\n\n\t\t\t\t// If class or style is provided for reverting - revert them all.\n\t\t\t\tthis._revert( consumableName, [ ...this._consumables[ consumableName ].keys() ] );\n\t\t\t} else {\n\t\t\t\tconst value = consumables.get( name );\n\n\t\t\t\tif ( value === false ) {\n\t\t\t\t\tconsumables.set( name, true );\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module engine/model/schema\n */\n\nimport CKEditorError from '@ckeditor/ckeditor5-utils/src/ckeditorerror';\nimport ObservableMixin from '@ckeditor/ckeditor5-utils/src/observablemixin';\nimport mix from '@ckeditor/ckeditor5-utils/src/mix';\n\nimport Range from './range';\nimport Position from './position';\nimport Element from './element';\nimport Text from './text';\nimport TreeWalker from './treewalker';\n\n/**\n * The model's schema. It defines allowed and disallowed structures of nodes as well as nodes' attributes.\n * The schema is usually defined by features and based on them the editing framework and features\n * make decisions how to change and process the model.\n *\n * The instance of schema is available in {@link module:engine/model/model~Model#schema `editor.model.schema`}.\n *\n * Read more about the schema in:\n *\n * * {@glink framework/guides/architecture/editing-engine#schema Schema} section of the\n * {@glink framework/guides/architecture/editing-engine Introduction to the Editing engine architecture}.\n * * {@glink framework/guides/deep-dive/schema Schema deep dive} guide.\n *\n * @mixes module:utils/observablemixin~ObservableMixin\n */\nexport default class Schema {\n\t/**\n\t * Creates schema instance.\n\t */\n\tconstructor() {\n\t\tthis._sourceDefinitions = {};\n\n\t\t/**\n\t\t * A dictionary containing attribute properties.\n\t\t *\n\t\t * @private\n\t\t * @member {Object.<String,String>}\n\t\t */\n\t\tthis._attributeProperties = {};\n\n\t\tthis.decorate( 'checkChild' );\n\t\tthis.decorate( 'checkAttribute' );\n\n\t\tthis.on( 'checkAttribute', ( evt, args ) => {\n\t\t\targs[ 0 ] = new SchemaContext( args[ 0 ] );\n\t\t}, { priority: 'highest' } );\n\n\t\tthis.on( 'checkChild', ( evt, args ) => {\n\t\t\targs[ 0 ] = new SchemaContext( args[ 0 ] );\n\t\t\targs[ 1 ] = this.getDefinition( args[ 1 ] );\n\t\t}, { priority: 'highest' } );\n\t}\n\n\t/**\n\t * Registers schema item. Can only be called once for every item name.\n\t *\n\t *\t\tschema.register( 'paragraph', {\n\t *\t\t\tinheritAllFrom: '$block'\n\t *\t\t} );\n\t *\n\t * @param {String} itemName\n\t * @param {module:engine/model/schema~SchemaItemDefinition} definition\n\t */\n\tregister( itemName, definition ) {\n\t\tif ( this._sourceDefinitions[ itemName ] ) {\n\t\t\t/**\n\t\t\t * A single item cannot be registered twice in the schema.\n\t\t\t *\n\t\t\t * This situation may happen when:\n\t\t\t *\n\t\t\t * * Two or more plugins called {@link #register `register()`} with the same name. This will usually mean that\n\t\t\t * there is a collision between plugins which try to use the same element in the model. Unfortunately,\n\t\t\t * the only way to solve this is by modifying one of these plugins to use a unique model element name.\n\t\t\t * * A single plugin was loaded twice. This happens when it is installed by npm/yarn in two versions\n\t\t\t * and usually means one or more of the following issues:\n\t\t\t *     * a version mismatch (two of your dependencies require two different versions of this plugin),\n\t\t\t *     * incorrect imports (this plugin is somehow imported twice in a way which confuses webpack),\n\t\t\t *     * mess in `node_modules/` (`rm -rf node_modules/` may help).\n\t\t\t *\n\t\t\t * **Note:** Check the logged `itemName` to better understand which plugin was duplicated/conflicting.\n\t\t\t *\n\t\t\t * @param itemName The name of the model element that is being registered twice.\n\t\t\t * @error schema-cannot-register-item-twice\n\t\t\t */\n\t\t\tthrow new CKEditorError(\n\t\t\t\t'schema-cannot-register-item-twice',\n\t\t\t\tthis,\n\t\t\t\t{\n\t\t\t\t\titemName\n\t\t\t\t}\n\t\t\t);\n\t\t}\n\n\t\tthis._sourceDefinitions[ itemName ] = [\n\t\t\tObject.assign( {}, definition )\n\t\t];\n\n\t\tthis._clearCache();\n\t}\n\n\t/**\n\t * Extends a {@link #register registered} item's definition.\n\t *\n\t * Extending properties such as `allowIn` will add more items to the existing properties,\n\t * while redefining properties such as `isBlock` will override the previously defined ones.\n\t *\n\t *\t\tschema.register( 'foo', {\n\t *\t\t\tallowIn: '$root',\n\t *\t\t\tisBlock: true;\n\t *\t\t} );\n\t *\t\tschema.extend( 'foo', {\n\t *\t\t\tallowIn: 'blockQuote',\n\t *\t\t\tisBlock: false\n\t *\t\t} );\n\t *\n\t *\t\tschema.getDefinition( 'foo' );\n\t *\t\t//\t{\n\t *\t\t//\t\tallowIn: [ '$root', 'blockQuote' ],\n\t *\t\t// \t\tisBlock: false\n\t *\t\t//\t}\n\t *\n\t * @param {String} itemName\n\t * @param {module:engine/model/schema~SchemaItemDefinition} definition\n\t */\n\textend( itemName, definition ) {\n\t\tif ( !this._sourceDefinitions[ itemName ] ) {\n\t\t\t/**\n\t\t\t * Cannot extend an item which was not registered yet.\n\t\t\t *\n\t\t\t * This error happens when a plugin tries to extend the schema definition of an item which was not\n\t\t\t * {@link #register registered} yet.\n\t\t\t *\n\t\t\t * @param itemName The name of the model element which is being extended.\n\t\t\t * @error schema-cannot-extend-missing-item\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'schema-cannot-extend-missing-item', this, {\n\t\t\t\titemName\n\t\t\t} );\n\t\t}\n\n\t\tthis._sourceDefinitions[ itemName ].push( Object.assign( {}, definition ) );\n\n\t\tthis._clearCache();\n\t}\n\n\t/**\n\t * Returns data of all registered items.\n\t *\n\t * This method should normally be used for reflection purposes (e.g. defining a clone of a certain element,\n\t * checking a list of all block elements, etc).\n\t * Use specific methods (such as {@link #checkChild `checkChild()`} or {@link #isLimit `isLimit()`})\n\t * in other cases.\n\t *\n\t * @returns {Object.<String,module:engine/model/schema~SchemaCompiledItemDefinition>}\n\t */\n\tgetDefinitions() {\n\t\tif ( !this._compiledDefinitions ) {\n\t\t\tthis._compile();\n\t\t}\n\n\t\treturn this._compiledDefinitions;\n\t}\n\n\t/**\n\t * Returns a definition of the given item or `undefined` if an item is not registered.\n\t *\n\t * This method should normally be used for reflection purposes (e.g. defining a clone of a certain element,\n\t * checking a list of all block elements, etc).\n\t * Use specific methods (such as {@link #checkChild `checkChild()`} or {@link #isLimit `isLimit()`})\n\t * in other cases.\n\t *\n\t * @param {module:engine/model/item~Item|module:engine/model/schema~SchemaContextItem|String} item\n\t * @returns {module:engine/model/schema~SchemaCompiledItemDefinition}\n\t */\n\tgetDefinition( item ) {\n\t\tlet itemName;\n\n\t\tif ( typeof item == 'string' ) {\n\t\t\titemName = item;\n\t\t} else if ( item.is && ( item.is( '$text' ) || item.is( '$textProxy' ) ) ) {\n\t\t\titemName = '$text';\n\t\t}\n\t\t// Element or module:engine/model/schema~SchemaContextItem.\n\t\telse {\n\t\t\titemName = item.name;\n\t\t}\n\n\t\treturn this.getDefinitions()[ itemName ];\n\t}\n\n\t/**\n\t * Returns `true` if the given item is registered in the schema.\n\t *\n\t *\t\tschema.isRegistered( 'paragraph' ); // -> true\n\t *\t\tschema.isRegistered( editor.model.document.getRoot() ); // -> true\n\t *\t\tschema.isRegistered( 'foo' ); // -> false\n\t *\n\t * @param {module:engine/model/item~Item|module:engine/model/schema~SchemaContextItem|String} item\n\t */\n\tisRegistered( item ) {\n\t\treturn !!this.getDefinition( item );\n\t}\n\n\t/**\n\t * Returns `true` if the given item is defined to be\n\t * a block by the {@link module:engine/model/schema~SchemaItemDefinition}'s `isBlock` property.\n\t *\n\t *\t\tschema.isBlock( 'paragraph' ); // -> true\n\t *\t\tschema.isBlock( '$root' ); // -> false\n\t *\n\t *\t\tconst paragraphElement = writer.createElement( 'paragraph' );\n\t *\t\tschema.isBlock( paragraphElement ); // -> true\n\t *\n\t * See the {@glink framework/guides/deep-dive/schema#block-elements Block elements} section of the Schema deep dive\n\t * guide for more details.\n\t *\n\t * @param {module:engine/model/item~Item|module:engine/model/schema~SchemaContextItem|String} item\n\t */\n\tisBlock( item ) {\n\t\tconst def = this.getDefinition( item );\n\n\t\treturn !!( def && def.isBlock );\n\t}\n\n\t/**\n\t * Returns `true` if the given item should be treated as a limit element.\n\t *\n\t * It considers an item to be a limit element if its\n\t * {@link module:engine/model/schema~SchemaItemDefinition}'s\n\t * {@link module:engine/model/schema~SchemaItemDefinition#isLimit `isLimit`} or\n\t * {@link module:engine/model/schema~SchemaItemDefinition#isObject `isObject`} property\n\t * was set to `true`.\n\t *\n\t *\t\tschema.isLimit( 'paragraph' ); // -> false\n\t *\t\tschema.isLimit( '$root' ); // -> true\n\t *\t\tschema.isLimit( editor.model.document.getRoot() ); // -> true\n\t *\t\tschema.isLimit( 'image' ); // -> true\n\t *\n\t * See the {@glink framework/guides/deep-dive/schema#limit-elements Limit elements} section of the Schema deep dive\n\t * guide for more details.\n\t *\n\t * @param {module:engine/model/item~Item|module:engine/model/schema~SchemaContextItem|String} item\n\t */\n\tisLimit( item ) {\n\t\tconst def = this.getDefinition( item );\n\n\t\tif ( !def ) {\n\t\t\treturn false;\n\t\t}\n\n\t\treturn !!( def.isLimit || def.isObject );\n\t}\n\n\t/**\n\t * Returns `true` if the given item should be treated as an object element.\n\t *\n\t * It considers an item to be an object element if its\n\t * {@link module:engine/model/schema~SchemaItemDefinition}'s\n\t * {@link module:engine/model/schema~SchemaItemDefinition#isObject `isObject`} property\n\t * was set to `true`.\n\t *\n\t *\t\tschema.isObject( 'paragraph' ); // -> false\n\t *\t\tschema.isObject( 'image' ); // -> true\n\t *\n\t *\t\tconst imageElement = writer.createElement( 'image' );\n\t *\t\tschema.isObject( imageElement ); // -> true\n\t *\n\t * See the {@glink framework/guides/deep-dive/schema#object-elements Object elements} section of the Schema deep dive\n\t * guide for more details.\n\t *\n\t * @param {module:engine/model/item~Item|module:engine/model/schema~SchemaContextItem|String} item\n\t */\n\tisObject( item ) {\n\t\tconst def = this.getDefinition( item );\n\n\t\tif ( !def ) {\n\t\t\treturn false;\n\t\t}\n\n\t\t// Note: Check out the implementation of #isLimit(), #isSelectable(), and #isContent()\n\t\t// to understand why these three constitute an object.\n\t\treturn !!( def.isObject || ( def.isLimit && def.isSelectable && def.isContent ) );\n\t}\n\n\t/**\n\t * Returns `true` if the given item is defined to be\n\t * an inline element by the {@link module:engine/model/schema~SchemaItemDefinition}'s `isInline` property.\n\t *\n\t *\t\tschema.isInline( 'paragraph' ); // -> false\n\t *\t\tschema.isInline( 'softBreak' ); // -> true\n\t *\n\t *\t\tconst text = writer.createText( 'foo' );\n\t *\t\tschema.isInline( text ); // -> true\n\t *\n\t * See the {@glink framework/guides/deep-dive/schema#inline-elements Inline elements} section of the Schema deep dive\n\t * guide for more details.\n\t *\n\t * @param {module:engine/model/item~Item|module:engine/model/schema~SchemaContextItem|String} item\n\t */\n\tisInline( item ) {\n\t\tconst def = this.getDefinition( item );\n\n\t\treturn !!( def && def.isInline );\n\t}\n\n\t/**\n\t * Returns `true` if the given item is defined to be\n\t * a selectable element by the {@link module:engine/model/schema~SchemaItemDefinition}'s `isSelectable` property.\n\t *\n\t *\t\tschema.isSelectable( 'paragraph' ); // -> false\n\t *\t\tschema.isSelectable( 'heading1' ); // -> false\n\t *\t\tschema.isSelectable( 'image' ); // -> true\n\t *\t\tschema.isSelectable( 'tableCell' ); // -> true\n\t *\n\t *\t\tconst text = writer.createText( 'foo' );\n\t *\t\tschema.isSelectable( text ); // -> false\n\t *\n\t * See the {@glink framework/guides/deep-dive/schema#selectable-elements Selectable elements} section of the Schema deep dive}\n\t * guide for more details.\n\t *\n\t * @param {module:engine/model/item~Item|module:engine/model/schema~SchemaContextItem|String} item\n\t */\n\tisSelectable( item ) {\n\t\tconst def = this.getDefinition( item );\n\n\t\tif ( !def ) {\n\t\t\treturn false;\n\t\t}\n\n\t\treturn !!( def.isSelectable || def.isObject );\n\t}\n\n\t/**\n\t * Returns `true` if the given item is defined to be\n\t * a content by the {@link module:engine/model/schema~SchemaItemDefinition}'s `isContent` property.\n\t *\n\t *\t\tschema.isContent( 'paragraph' ); // -> false\n\t *\t\tschema.isContent( 'heading1' ); // -> false\n\t *\t\tschema.isContent( 'image' ); // -> true\n\t *\t\tschema.isContent( 'horizontalLine' ); // -> true\n\t *\n\t *\t\tconst text = writer.createText( 'foo' );\n\t *\t\tschema.isContent( text ); // -> true\n\t *\n\t * See the {@glink framework/guides/deep-dive/schema#content-elements Content elements} section of the Schema deep dive}\n\t * guide for more details.\n\t *\n\t * @param {module:engine/model/item~Item|module:engine/model/schema~SchemaContextItem|String} item\n\t */\n\tisContent( item ) {\n\t\tconst def = this.getDefinition( item );\n\n\t\tif ( !def ) {\n\t\t\treturn false;\n\t\t}\n\n\t\treturn !!( def.isContent || def.isObject );\n\t}\n\n\t/**\n\t * Checks whether the given node (`child`) can be a child of the given context.\n\t *\n\t *\t\tschema.checkChild( model.document.getRoot(), paragraph ); // -> false\n\t *\n\t *\t\tschema.register( 'paragraph', {\n\t *\t\t\tallowIn: '$root'\n\t *\t\t} );\n\t *\t\tschema.checkChild( model.document.getRoot(), paragraph ); // -> true\n\t *\n\t * Note: When verifying whether the given node can be a child of the given context, the\n\t * schema also verifies the entire context &mdash; from its root to its last element. Therefore, it is possible\n\t * for `checkChild()` to return `false` even though the context's last element can contain the checked child.\n\t * It happens if one of the context's elements does not allow its child.\n\t *\n\t * @fires checkChild\n\t * @param {module:engine/model/schema~SchemaContextDefinition} context The context in which the child will be checked.\n\t * @param {module:engine/model/node~Node|String} def The child to check.\n\t */\n\tcheckChild( context, def ) {\n\t\t// Note: context and child are already normalized here to a SchemaContext and SchemaCompiledItemDefinition.\n\t\tif ( !def ) {\n\t\t\treturn false;\n\t\t}\n\n\t\treturn this._checkContextMatch( def, context );\n\t}\n\n\t/**\n\t * Checks whether the given attribute can be applied in the given context (on the last\n\t * item of the context).\n\t *\n\t *\t\tschema.checkAttribute( textNode, 'bold' ); // -> false\n\t *\n\t *\t\tschema.extend( '$text', {\n\t *\t\t\tallowAttributes: 'bold'\n\t *\t\t} );\n\t *\t\tschema.checkAttribute( textNode, 'bold' ); // -> true\n\t *\n\t * @fires checkAttribute\n\t * @param {module:engine/model/schema~SchemaContextDefinition} context The context in which the attribute will be checked.\n\t * @param {String} attributeName\n\t */\n\tcheckAttribute( context, attributeName ) {\n\t\tconst def = this.getDefinition( context.last );\n\n\t\tif ( !def ) {\n\t\t\treturn false;\n\t\t}\n\n\t\treturn def.allowAttributes.includes( attributeName );\n\t}\n\n\t/**\n\t * Checks whether the given element (`elementToMerge`) can be merged with the specified base element (`positionOrBaseElement`).\n\t *\n\t * In other words &mdash; whether `elementToMerge`'s children {@link #checkChild are allowed} in the `positionOrBaseElement`.\n\t *\n\t * This check ensures that elements merged with {@link module:engine/model/writer~Writer#merge `Writer#merge()`}\n\t * will be valid.\n\t *\n\t * Instead of elements, you can pass the instance of the {@link module:engine/model/position~Position} class as the\n\t * `positionOrBaseElement`. It means that the elements before and after the position will be checked whether they can be merged.\n\t *\n\t * @param {module:engine/model/position~Position|module:engine/model/element~Element} positionOrBaseElement The position or base\n\t * element to which the `elementToMerge` will be merged.\n\t * @param {module:engine/model/element~Element} elementToMerge The element to merge. Required if `positionOrBaseElement` is an element.\n\t * @returns {Boolean}\n\t */\n\tcheckMerge( positionOrBaseElement, elementToMerge = null ) {\n\t\tif ( positionOrBaseElement instanceof Position ) {\n\t\t\tconst nodeBefore = positionOrBaseElement.nodeBefore;\n\t\t\tconst nodeAfter = positionOrBaseElement.nodeAfter;\n\n\t\t\tif ( !( nodeBefore instanceof Element ) ) {\n\t\t\t\t/**\n\t\t\t\t * The node before the merge position must be an element.\n\t\t\t\t *\n\t\t\t\t * @error schema-check-merge-no-element-before\n\t\t\t\t */\n\t\t\t\tthrow new CKEditorError(\n\t\t\t\t\t'schema-check-merge-no-element-before',\n\t\t\t\t\tthis\n\t\t\t\t);\n\t\t\t}\n\n\t\t\tif ( !( nodeAfter instanceof Element ) ) {\n\t\t\t\t/**\n\t\t\t\t * The node after the merge position must be an element.\n\t\t\t\t *\n\t\t\t\t * @error schema-check-merge-no-element-after\n\t\t\t\t */\n\t\t\t\tthrow new CKEditorError(\n\t\t\t\t\t'schema-check-merge-no-element-after',\n\t\t\t\t\tthis\n\t\t\t\t);\n\t\t\t}\n\n\t\t\treturn this.checkMerge( nodeBefore, nodeAfter );\n\t\t}\n\n\t\tfor ( const child of elementToMerge.getChildren() ) {\n\t\t\tif ( !this.checkChild( positionOrBaseElement, child ) ) {\n\t\t\t\treturn false;\n\t\t\t}\n\t\t}\n\n\t\treturn true;\n\t}\n\n\t/**\n\t * Allows registering a callback to the {@link #checkChild} method calls.\n\t *\n\t * Callbacks allow you to implement rules which are not otherwise possible to achieve\n\t * by using the declarative API of {@link module:engine/model/schema~SchemaItemDefinition}.\n\t * For example, by using this method you can disallow elements in specific contexts.\n\t *\n\t * This method is a shorthand for using the {@link #event:checkChild} event. For even better control,\n\t * you can use that event instead.\n\t *\n\t * Example:\n\t *\n\t *\t\t// Disallow heading1 directly inside a blockQuote.\n\t *\t\tschema.addChildCheck( ( context, childDefinition ) => {\n\t *\t\t\tif ( context.endsWith( 'blockQuote' ) && childDefinition.name == 'heading1' ) {\n\t *\t\t\t\treturn false;\n\t *\t\t\t}\n\t *\t\t} );\n\t *\n\t * Which translates to:\n\t *\n\t *\t\tschema.on( 'checkChild', ( evt, args ) => {\n\t *\t\t\tconst context = args[ 0 ];\n\t *\t\t\tconst childDefinition = args[ 1 ];\n\t *\n\t *\t\t\tif ( context.endsWith( 'blockQuote' ) && childDefinition && childDefinition.name == 'heading1' ) {\n\t *\t\t\t\t// Prevent next listeners from being called.\n\t *\t\t\t\tevt.stop();\n\t *\t\t\t\t// Set the checkChild()'s return value.\n\t *\t\t\t\tevt.return = false;\n\t *\t\t\t}\n\t *\t\t}, { priority: 'high' } );\n\t *\n\t * @param {Function} callback The callback to be called. It is called with two parameters:\n\t * {@link module:engine/model/schema~SchemaContext} (context) instance and\n\t * {@link module:engine/model/schema~SchemaCompiledItemDefinition} (child-to-check definition).\n\t * The callback may return `true/false` to override `checkChild()`'s return value. If it does not return\n\t * a boolean value, the default algorithm (or other callbacks) will define `checkChild()`'s return value.\n\t */\n\taddChildCheck( callback ) {\n\t\tthis.on( 'checkChild', ( evt, [ ctx, childDef ] ) => {\n\t\t\t// checkChild() was called with a non-registered child.\n\t\t\t// In 99% cases such check should return false, so not to overcomplicate all callbacks\n\t\t\t// don't even execute them.\n\t\t\tif ( !childDef ) {\n\t\t\t\treturn;\n\t\t\t}\n\n\t\t\tconst retValue = callback( ctx, childDef );\n\n\t\t\tif ( typeof retValue == 'boolean' ) {\n\t\t\t\tevt.stop();\n\t\t\t\tevt.return = retValue;\n\t\t\t}\n\t\t}, { priority: 'high' } );\n\t}\n\n\t/**\n\t * Allows registering a callback to the {@link #checkAttribute} method calls.\n\t *\n\t * Callbacks allow you to implement rules which are not otherwise possible to achieve\n\t * by using the declarative API of {@link module:engine/model/schema~SchemaItemDefinition}.\n\t * For example, by using this method you can disallow attribute if node to which it is applied\n\t * is contained within some other element (e.g. you want to disallow `bold` on `$text` within `heading1`).\n\t *\n\t * This method is a shorthand for using the {@link #event:checkAttribute} event. For even better control,\n\t * you can use that event instead.\n\t *\n\t * Example:\n\t *\n\t *\t\t// Disallow bold on $text inside heading1.\n\t *\t\tschema.addAttributeCheck( ( context, attributeName ) => {\n\t *\t\t\tif ( context.endsWith( 'heading1 $text' ) && attributeName == 'bold' ) {\n\t *\t\t\t\treturn false;\n\t *\t\t\t}\n\t *\t\t} );\n\t *\n\t * Which translates to:\n\t *\n\t *\t\tschema.on( 'checkAttribute', ( evt, args ) => {\n\t *\t\t\tconst context = args[ 0 ];\n\t *\t\t\tconst attributeName = args[ 1 ];\n\t *\n\t *\t\t\tif ( context.endsWith( 'heading1 $text' ) && attributeName == 'bold' ) {\n\t *\t\t\t\t// Prevent next listeners from being called.\n\t *\t\t\t\tevt.stop();\n\t *\t\t\t\t// Set the checkAttribute()'s return value.\n\t *\t\t\t\tevt.return = false;\n\t *\t\t\t}\n\t *\t\t}, { priority: 'high' } );\n\t *\n\t * @param {Function} callback The callback to be called. It is called with two parameters:\n\t * {@link module:engine/model/schema~SchemaContext} (context) instance and attribute name.\n\t * The callback may return `true/false` to override `checkAttribute()`'s return value. If it does not return\n\t * a boolean value, the default algorithm (or other callbacks) will define `checkAttribute()`'s return value.\n\t */\n\taddAttributeCheck( callback ) {\n\t\tthis.on( 'checkAttribute', ( evt, [ ctx, attributeName ] ) => {\n\t\t\tconst retValue = callback( ctx, attributeName );\n\n\t\t\tif ( typeof retValue == 'boolean' ) {\n\t\t\t\tevt.stop();\n\t\t\t\tevt.return = retValue;\n\t\t\t}\n\t\t}, { priority: 'high' } );\n\t}\n\n\t/**\n\t * This method allows assigning additional metadata to the model attributes. For example,\n\t * {@link module:engine/model/schema~AttributeProperties `AttributeProperties#isFormatting` property} is\n\t * used to mark formatting attributes (like `bold` or `italic`).\n\t *\n\t *\t\t// Mark bold as a formatting attribute.\n\t *\t\tschema.setAttributeProperties( 'bold', {\n\t *\t\t\tisFormatting: true\n\t *\t\t} );\n\t *\n\t *\t\t// Override code not to be considered a formatting markup.\n\t *\t\tschema.setAttributeProperties( 'code', {\n\t *\t\t\tisFormatting: false\n\t *\t\t} );\n\t *\n\t * Properties are not limited to members defined in the\n\t * {@link module:engine/model/schema~AttributeProperties `AttributeProperties` type} and you can also use custom properties:\n\t *\n\t *\t\tschema.setAttributeProperties( 'blockQuote', {\n\t *\t\t\tcustomProperty: 'value'\n\t *\t\t} );\n\t *\n\t * Subsequent calls with the same attribute will extend its custom properties:\n\t *\n\t *\t\tschema.setAttributeProperties( 'blockQuote', {\n\t *\t\t\tone: 1\n\t *\t\t} );\n\t *\n\t *\t\tschema.setAttributeProperties( 'blockQuote', {\n\t *\t\t\ttwo: 2\n\t *\t\t} );\n\t *\n\t *\t\tconsole.log( schema.getAttributeProperties( 'blockQuote' ) );\n\t *\t\t// Logs: { one: 1, two: 2 }\n\t *\n\t * @param {String} attributeName A name of the attribute to receive the properties.\n\t * @param {module:engine/model/schema~AttributeProperties} properties A dictionary of properties.\n\t */\n\tsetAttributeProperties( attributeName, properties ) {\n\t\tthis._attributeProperties[ attributeName ] = Object.assign( this.getAttributeProperties( attributeName ), properties );\n\t}\n\n\t/**\n\t * Returns properties associated with a given model attribute. See {@link #setAttributeProperties `setAttributeProperties()`}.\n\t *\n\t * @param {String} attributeName A name of the attribute.\n\t * @returns {module:engine/model/schema~AttributeProperties}\n\t */\n\tgetAttributeProperties( attributeName ) {\n\t\treturn this._attributeProperties[ attributeName ] || {};\n\t}\n\n\t/**\n\t * Returns the lowest {@link module:engine/model/schema~Schema#isLimit limit element} containing the entire\n\t * selection/range/position or the root otherwise.\n\t *\n\t * @param {module:engine/model/selection~Selection|module:engine/model/documentselection~DocumentSelection|\n\t * module:engine/model/range~Range|module:engine/model/position~Position} selectionOrRangeOrPosition\n\t * The selection/range/position to check.\n\t * @returns {module:engine/model/element~Element} The lowest limit element containing\n\t * the entire `selectionOrRangeOrPosition`.\n\t */\n\tgetLimitElement( selectionOrRangeOrPosition ) {\n\t\tlet element;\n\n\t\tif ( selectionOrRangeOrPosition instanceof Position ) {\n\t\t\telement = selectionOrRangeOrPosition.parent;\n\t\t} else {\n\t\t\tconst ranges = selectionOrRangeOrPosition instanceof Range ?\n\t\t\t\t[ selectionOrRangeOrPosition ] :\n\t\t\t\tArray.from( selectionOrRangeOrPosition.getRanges() );\n\n\t\t\t// Find the common ancestor for all selection's ranges.\n\t\t\telement = ranges\n\t\t\t\t.reduce( ( element, range ) => {\n\t\t\t\t\tconst rangeCommonAncestor = range.getCommonAncestor();\n\n\t\t\t\t\tif ( !element ) {\n\t\t\t\t\t\treturn rangeCommonAncestor;\n\t\t\t\t\t}\n\n\t\t\t\t\treturn element.getCommonAncestor( rangeCommonAncestor, { includeSelf: true } );\n\t\t\t\t}, null );\n\t\t}\n\n\t\twhile ( !this.isLimit( element ) ) {\n\t\t\tif ( element.parent ) {\n\t\t\t\telement = element.parent;\n\t\t\t} else {\n\t\t\t\tbreak;\n\t\t\t}\n\t\t}\n\n\t\treturn element;\n\t}\n\n\t/**\n\t * Checks whether the attribute is allowed in selection:\n\t *\n\t * * if the selection is not collapsed, then checks if the attribute is allowed on any of nodes in that range,\n\t * * if the selection is collapsed, then checks if on the selection position there's a text with the\n\t * specified attribute allowed.\n\t *\n\t * @param {module:engine/model/selection~Selection|module:engine/model/documentselection~DocumentSelection} selection\n\t * Selection which will be checked.\n\t * @param {String} attribute The name of the attribute to check.\n\t * @returns {Boolean}\n\t */\n\tcheckAttributeInSelection( selection, attribute ) {\n\t\tif ( selection.isCollapsed ) {\n\t\t\tconst firstPosition = selection.getFirstPosition();\n\t\t\tconst context = [\n\t\t\t\t...firstPosition.getAncestors(),\n\t\t\t\tnew Text( '', selection.getAttributes() )\n\t\t\t];\n\n\t\t\t// Check whether schema allows for a text with the attribute in the selection.\n\t\t\treturn this.checkAttribute( context, attribute );\n\t\t} else {\n\t\t\tconst ranges = selection.getRanges();\n\n\t\t\t// For all ranges, check nodes in them until you find a node that is allowed to have the attribute.\n\t\t\tfor ( const range of ranges ) {\n\t\t\t\tfor ( const value of range ) {\n\t\t\t\t\tif ( this.checkAttribute( value.item, attribute ) ) {\n\t\t\t\t\t\t// If we found a node that is allowed to have the attribute, return true.\n\t\t\t\t\t\treturn true;\n\t\t\t\t\t}\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\n\t\t// If we haven't found such node, return false.\n\t\treturn false;\n\t}\n\n\t/**\n\t * Transforms the given set of ranges into a set of ranges where the given attribute is allowed (and can be applied).\n\t *\n\t * @param {Array.<module:engine/model/range~Range>} ranges Ranges to be validated.\n\t * @param {String} attribute The name of the attribute to check.\n\t * @returns {Iterable.<module:engine/model/range~Range>} Ranges in which the attribute is allowed.\n\t */\n\t* getValidRanges( ranges, attribute ) {\n\t\tranges = convertToMinimalFlatRanges( ranges );\n\n\t\tfor ( const range of ranges ) {\n\t\t\tyield* this._getValidRangesForRange( range, attribute );\n\t\t}\n\t}\n\n\t/**\n\t * Basing on given `position`, finds and returns a {@link module:engine/model/range~Range range} which is\n\t * nearest to that `position` and is a correct range for selection.\n\t *\n\t * The correct selection range might be collapsed when it is located in a position where the text node can be placed.\n\t * Non-collapsed range is returned when selection can be placed around element marked as an \"object\" in\n\t * the {@link module:engine/model/schema~Schema schema}.\n\t *\n\t * Direction of searching for the nearest correct selection range can be specified as:\n\t *\n\t * * `both` - searching will be performed in both ways,\n\t * * `forward` - searching will be performed only forward,\n\t * * `backward` - searching will be performed only backward.\n\t *\n\t * When valid selection range cannot be found, `null` is returned.\n\t *\n\t * @param {module:engine/model/position~Position} position Reference position where new selection range should be looked for.\n\t * @param {'both'|'forward'|'backward'} [direction='both'] Search direction.\n\t * @returns {module:engine/model/range~Range|null} Nearest selection range or `null` if one cannot be found.\n\t */\n\tgetNearestSelectionRange( position, direction = 'both' ) {\n\t\t// Return collapsed range if provided position is valid.\n\t\tif ( this.checkChild( position, '$text' ) ) {\n\t\t\treturn new Range( position );\n\t\t}\n\n\t\tlet backwardWalker, forwardWalker;\n\n\t\t// Never leave a limit element.\n\t\tconst limitElement = position.getAncestors().reverse().find( item => this.isLimit( item ) ) || position.root;\n\n\t\tif ( direction == 'both' || direction == 'backward' ) {\n\t\t\tbackwardWalker = new TreeWalker( {\n\t\t\t\tboundaries: Range._createIn( limitElement ),\n\t\t\t\tstartPosition: position,\n\t\t\t\tdirection: 'backward'\n\t\t\t} );\n\t\t}\n\n\t\tif ( direction == 'both' || direction == 'forward' ) {\n\t\t\tforwardWalker = new TreeWalker( {\n\t\t\t\tboundaries: Range._createIn( limitElement ),\n\t\t\t\tstartPosition: position\n\t\t\t} );\n\t\t}\n\n\t\tfor ( const data of combineWalkers( backwardWalker, forwardWalker ) ) {\n\t\t\tconst type = ( data.walker == backwardWalker ? 'elementEnd' : 'elementStart' );\n\t\t\tconst value = data.value;\n\n\t\t\tif ( value.type == type && this.isObject( value.item ) ) {\n\t\t\t\treturn Range._createOn( value.item );\n\t\t\t}\n\n\t\t\tif ( this.checkChild( value.nextPosition, '$text' ) ) {\n\t\t\t\treturn new Range( value.nextPosition );\n\t\t\t}\n\t\t}\n\n\t\treturn null;\n\t}\n\n\t/**\n\t * Tries to find position ancestors that allow to insert a given node.\n\t * It starts searching from the given position and goes node by node to the top of the model tree\n\t * as long as a {@link module:engine/model/schema~Schema#isLimit limit element}, an\n\t * {@link module:engine/model/schema~Schema#isObject object element} or a topmost ancestor is not reached.\n\t *\n\t * @param {module:engine/model/position~Position} position The position that the search will start from.\n\t * @param {module:engine/model/node~Node|String} node The node for which an allowed parent should be found or its name.\n\t * @returns {module:engine/model/element~Element|null} element Allowed parent or null if nothing was found.\n\t */\n\tfindAllowedParent( position, node ) {\n\t\tlet parent = position.parent;\n\n\t\twhile ( parent ) {\n\t\t\tif ( this.checkChild( parent, node ) ) {\n\t\t\t\treturn parent;\n\t\t\t}\n\n\t\t\t// Do not split limit elements.\n\t\t\tif ( this.isLimit( parent ) ) {\n\t\t\t\treturn null;\n\t\t\t}\n\n\t\t\tparent = parent.parent;\n\t\t}\n\n\t\treturn null;\n\t}\n\n\t/**\n\t * Removes attributes disallowed by the schema.\n\t *\n\t * @param {Iterable.<module:engine/model/node~Node>} nodes Nodes that will be filtered.\n\t * @param {module:engine/model/writer~Writer} writer\n\t */\n\tremoveDisallowedAttributes( nodes, writer ) {\n\t\tfor ( const node of nodes ) {\n\t\t\t// When node is a `Text` it has no children, so just filter it out.\n\t\t\tif ( node.is( '$text' ) ) {\n\t\t\t\tremoveDisallowedAttributeFromNode( this, node, writer );\n\t\t\t}\n\t\t\t// In a case of `Element` iterates through positions between nodes inside this element\n\t\t\t// and filter out node before the current position, or position parent when position\n\t\t\t// is at start of an element. Using positions prevent from omitting merged nodes\n\t\t\t// see https://github.com/ckeditor/ckeditor5-engine/issues/1789.\n\t\t\telse {\n\t\t\t\tconst rangeInNode = Range._createIn( node );\n\t\t\t\tconst positionsInRange = rangeInNode.getPositions();\n\n\t\t\t\tfor ( const position of positionsInRange ) {\n\t\t\t\t\tconst item = position.nodeBefore || position.parent;\n\n\t\t\t\t\tremoveDisallowedAttributeFromNode( this, item, writer );\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\t}\n\n\t/**\n\t * Creates an instance of the schema context.\n\t *\n\t * @param {module:engine/model/schema~SchemaContextDefinition} context\n\t * @returns {module:engine/model/schema~SchemaContext}\n\t */\n\tcreateContext( context ) {\n\t\treturn new SchemaContext( context );\n\t}\n\n\t/**\n\t * @private\n\t */\n\t_clearCache() {\n\t\tthis._compiledDefinitions = null;\n\t}\n\n\t/**\n\t * @private\n\t */\n\t_compile() {\n\t\tconst compiledDefinitions = {};\n\t\tconst sourceRules = this._sourceDefinitions;\n\t\tconst itemNames = Object.keys( sourceRules );\n\n\t\tfor ( const itemName of itemNames ) {\n\t\t\tcompiledDefinitions[ itemName ] = compileBaseItemRule( sourceRules[ itemName ], itemName );\n\t\t}\n\n\t\tfor ( const itemName of itemNames ) {\n\t\t\tcompileAllowContentOf( compiledDefinitions, itemName );\n\t\t}\n\n\t\tfor ( const itemName of itemNames ) {\n\t\t\tcompileAllowWhere( compiledDefinitions, itemName );\n\t\t}\n\n\t\tfor ( const itemName of itemNames ) {\n\t\t\tcompileAllowAttributesOf( compiledDefinitions, itemName );\n\t\t\tcompileInheritPropertiesFrom( compiledDefinitions, itemName );\n\t\t}\n\n\t\tfor ( const itemName of itemNames ) {\n\t\t\tcleanUpAllowIn( compiledDefinitions, itemName );\n\t\t\tcleanUpAllowAttributes( compiledDefinitions, itemName );\n\t\t}\n\n\t\tthis._compiledDefinitions = compiledDefinitions;\n\t}\n\n\t/**\n\t * @private\n\t * @param {module:engine/model/schema~SchemaCompiledItemDefinition} def\n\t * @param {module:engine/model/schema~SchemaContext} context\n\t * @param {Number} contextItemIndex\n\t */\n\t_checkContextMatch( def, context, contextItemIndex = context.length - 1 ) {\n\t\tconst contextItem = context.getItem( contextItemIndex );\n\n\t\tif ( def.allowIn.includes( contextItem.name ) ) {\n\t\t\tif ( contextItemIndex == 0 ) {\n\t\t\t\treturn true;\n\t\t\t} else {\n\t\t\t\tconst parentRule = this.getDefinition( contextItem );\n\n\t\t\t\treturn this._checkContextMatch( parentRule, context, contextItemIndex - 1 );\n\t\t\t}\n\t\t} else {\n\t\t\treturn false;\n\t\t}\n\t}\n\n\t/**\n\t * Takes a flat range and an attribute name. Traverses the range recursively and deeply to find and return all ranges\n\t * inside the given range on which the attribute can be applied.\n\t *\n\t * This is a helper function for {@link ~Schema#getValidRanges}.\n\t *\n\t * @private\n\t * @param {module:engine/model/range~Range} range The range to process.\n\t * @param {String} attribute The name of the attribute to check.\n\t * @returns {Iterable.<module:engine/model/range~Range>} Ranges in which the attribute is allowed.\n\t */\n\t* _getValidRangesForRange( range, attribute ) {\n\t\tlet start = range.start;\n\t\tlet end = range.start;\n\n\t\tfor ( const item of range.getItems( { shallow: true } ) ) {\n\t\t\tif ( item.is( 'element' ) ) {\n\t\t\t\tyield* this._getValidRangesForRange( Range._createIn( item ), attribute );\n\t\t\t}\n\n\t\t\tif ( !this.checkAttribute( item, attribute ) ) {\n\t\t\t\tif ( !start.isEqual( end ) ) {\n\t\t\t\t\tyield new Range( start, end );\n\t\t\t\t}\n\n\t\t\t\tstart = Position._createAfter( item );\n\t\t\t}\n\n\t\t\tend = Position._createAfter( item );\n\t\t}\n\n\t\tif ( !start.isEqual( end ) ) {\n\t\t\tyield new Range( start, end );\n\t\t}\n\t}\n}\n\nmix( Schema, ObservableMixin );\n\n/**\n * Event fired when the {@link #checkChild} method is called. It allows plugging in\n * additional behavior, for example implementing rules which cannot be defined using the declarative\n * {@link module:engine/model/schema~SchemaItemDefinition} interface.\n *\n * **Note:** The {@link #addChildCheck} method is a more handy way to register callbacks. Internally,\n * it registers a listener to this event but comes with a simpler API and it is the recommended choice\n * in most of the cases.\n *\n * The {@link #checkChild} method fires an event because it is\n * {@link module:utils/observablemixin~ObservableMixin#decorate decorated} with it. Thanks to that you can\n * use this event in various ways, but the most important use case is overriding standard behavior of the\n * `checkChild()` method. Let's see a typical listener template:\n *\n *\t\tschema.on( 'checkChild', ( evt, args ) => {\n *\t\t\tconst context = args[ 0 ];\n *\t\t\tconst childDefinition = args[ 1 ];\n *\t\t}, { priority: 'high' } );\n *\n * The listener is added with a `high` priority to be executed before the default method is really called. The `args` callback\n * parameter contains arguments passed to `checkChild( context, child )`. However, the `context` parameter is already\n * normalized to a {@link module:engine/model/schema~SchemaContext} instance and `child` to a\n * {@link module:engine/model/schema~SchemaCompiledItemDefinition} instance, so you do not have to worry about\n * the various ways how `context` and `child` may be passed to `checkChild()`.\n *\n * **Note:** `childDefinition` may be `undefined` if `checkChild()` was called with a non-registered element.\n *\n * So, in order to implement a rule \"disallow `heading1` in `blockQuote`\", you can add such a listener:\n *\n *\t\tschema.on( 'checkChild', ( evt, args ) => {\n *\t\t\tconst context = args[ 0 ];\n *\t\t\tconst childDefinition = args[ 1 ];\n *\n *\t\t\tif ( context.endsWith( 'blockQuote' ) && childDefinition && childDefinition.name == 'heading1' ) {\n *\t\t\t\t// Prevent next listeners from being called.\n *\t\t\t\tevt.stop();\n *\t\t\t\t// Set the checkChild()'s return value.\n *\t\t\t\tevt.return = false;\n *\t\t\t}\n *\t\t}, { priority: 'high' } );\n *\n * Allowing elements in specific contexts will be a far less common use case, because it is normally handled by the\n * `allowIn` rule from {@link module:engine/model/schema~SchemaItemDefinition}. But if you have a complex scenario\n * where `listItem` should be allowed only in element `foo` which must be in element `bar`, then this would be the way:\n *\n *\t\tschema.on( 'checkChild', ( evt, args ) => {\n *\t\t\tconst context = args[ 0 ];\n *\t\t\tconst childDefinition = args[ 1 ];\n *\n *\t\t\tif ( context.endsWith( 'bar foo' ) && childDefinition.name == 'listItem' ) {\n *\t\t\t\t// Prevent next listeners from being called.\n *\t\t\t\tevt.stop();\n *\t\t\t\t// Set the checkChild()'s return value.\n *\t\t\t\tevt.return = true;\n *\t\t\t}\n *\t\t}, { priority: 'high' } );\n *\n * @event checkChild\n * @param {Array} args The `checkChild()`'s arguments.\n */\n\n/**\n * Event fired when the {@link #checkAttribute} method is called. It allows plugging in\n * additional behavior, for example implementing rules which cannot be defined using the declarative\n * {@link module:engine/model/schema~SchemaItemDefinition} interface.\n *\n * **Note:** The {@link #addAttributeCheck} method is a more handy way to register callbacks. Internally,\n * it registers a listener to this event but comes with a simpler API and it is the recommended choice\n * in most of the cases.\n *\n * The {@link #checkAttribute} method fires an event because it is\n * {@link module:utils/observablemixin~ObservableMixin#decorate decorated} with it. Thanks to that you can\n * use this event in various ways, but the most important use case is overriding the standard behavior of the\n * `checkAttribute()` method. Let's see a typical listener template:\n *\n *\t\tschema.on( 'checkAttribute', ( evt, args ) => {\n *\t\t\tconst context = args[ 0 ];\n *\t\t\tconst attributeName = args[ 1 ];\n *\t\t}, { priority: 'high' } );\n *\n * The listener is added with a `high` priority to be executed before the default method is really called. The `args` callback\n * parameter contains arguments passed to `checkAttribute( context, attributeName )`. However, the `context` parameter is already\n * normalized to a {@link module:engine/model/schema~SchemaContext} instance, so you do not have to worry about\n * the various ways how `context` may be passed to `checkAttribute()`.\n *\n * So, in order to implement a rule \"disallow `bold` in a text which is in a `heading1`, you can add such a listener:\n *\n *\t\tschema.on( 'checkAttribute', ( evt, args ) => {\n *\t\t\tconst context = args[ 0 ];\n *\t\t\tconst attributeName = args[ 1 ];\n *\n *\t\t\tif ( context.endsWith( 'heading1 $text' ) && attributeName == 'bold' ) {\n *\t\t\t\t// Prevent next listeners from being called.\n *\t\t\t\tevt.stop();\n *\t\t\t\t// Set the checkAttribute()'s return value.\n *\t\t\t\tevt.return = false;\n *\t\t\t}\n *\t\t}, { priority: 'high' } );\n *\n * Allowing attributes in specific contexts will be a far less common use case, because it is normally handled by the\n * `allowAttributes` rule from {@link module:engine/model/schema~SchemaItemDefinition}. But if you have a complex scenario\n * where `bold` should be allowed only in element `foo` which must be in element `bar`, then this would be the way:\n *\n *\t\tschema.on( 'checkAttribute', ( evt, args ) => {\n *\t\t\tconst context = args[ 0 ];\n *\t\t\tconst attributeName = args[ 1 ];\n *\n *\t\t\tif ( context.endsWith( 'bar foo $text' ) && attributeName == 'bold' ) {\n *\t\t\t\t// Prevent next listeners from being called.\n *\t\t\t\tevt.stop();\n *\t\t\t\t// Set the checkAttribute()'s return value.\n *\t\t\t\tevt.return = true;\n *\t\t\t}\n *\t\t}, { priority: 'high' } );\n *\n * @event checkAttribute\n * @param {Array} args The `checkAttribute()`'s arguments.\n */\n\n/**\n * A definition of a {@link module:engine/model/schema~Schema schema} item.\n *\n * You can define the following rules:\n *\n * * {@link ~SchemaItemDefinition#allowIn `allowIn`} &ndash; Defines in which other items this item will be allowed.\n * * {@link ~SchemaItemDefinition#allowAttributes `allowAttributes`} &ndash; Defines allowed attributes of the given item.\n * * {@link ~SchemaItemDefinition#allowContentOf `allowContentOf`} &ndash; Inherits \"allowed children\" from other items.\n * * {@link ~SchemaItemDefinition#allowWhere `allowWhere`} &ndash; Inherits \"allowed in\" from other items.\n * * {@link ~SchemaItemDefinition#allowAttributesOf `allowAttributesOf`} &ndash; Inherits attributes from other items.\n * * {@link ~SchemaItemDefinition#inheritTypesFrom `inheritTypesFrom`} &ndash; Inherits `is*` properties of other items.\n * * {@link ~SchemaItemDefinition#inheritAllFrom `inheritAllFrom`} &ndash;\n * A shorthand for `allowContentOf`, `allowWhere`, `allowAttributesOf`, `inheritTypesFrom`.\n *\n * # The `is*` properties\n *\n * There are a couple commonly used `is*` properties. Their role is to assign additional semantics to schema items.\n * You can define more properties but you will also need to implement support for them in the existing editor features.\n *\n * * {@link ~SchemaItemDefinition#isBlock `isBlock`} &ndash; Whether this item is paragraph-like.\n * Generally speaking, content is usually made out of blocks like paragraphs, list items, images, headings, etc.\n * * {@link ~SchemaItemDefinition#isInline `isInline`} &ndash; Whether an item is \"text-like\" and should be treated as an inline node.\n * Examples of inline elements: `$text`, `softBreak` (`<br>`), etc.\n * * {@link ~SchemaItemDefinition#isLimit `isLimit`} &ndash; It can be understood as whether this element\n * should not be split by <kbd>Enter</kbd>. Examples of limit elements: `$root`, table cell, image caption, etc.\n * In other words, all actions that happen inside a limit element are limited to its content.\n * All objects are treated as limit elements, too.\n * * {@link ~SchemaItemDefinition#isObject `isObject`} &ndash; Whether an item is \"self-contained\" and should be treated as a whole.\n * Examples of object elements: `image`, `table`, `video`, etc. An object is also a limit, so\n * {@link module:engine/model/schema~Schema#isLimit `isLimit()`} returns `true` for object elements automatically.\n *\n * Read more about the meaning of these types in the\n * {@glink framework/guides/deep-dive/schema#defining-additional-semantics dedicated section of the Schema deep dive} guide.\n *\n * # Generic items\n *\n * There are three basic generic items: `$root`, `$block` and `$text`.\n * They are defined as follows:\n *\n *\t\tthis.schema.register( '$root', {\n *\t\t\tisLimit: true\n *\t\t} );\n *\t\tthis.schema.register( '$block', {\n *\t\t\tallowIn: '$root',\n *\t\t\tisBlock: true\n *\t\t} );\n *\t\tthis.schema.register( '$text', {\n *\t\t\tallowIn: '$block',\n *\t\t\tisInline: true\n *\t\t} );\n *\n * They reflect typical editor content that is contained within one root, consists of several blocks\n * (paragraphs, lists items, headings, images) which, in turn, may contain text inside.\n *\n * By inheriting from the generic items you can define new items which will get extended by other editor features.\n * Read more about generic types in the {@glink framework/guides/deep-dive/schema Schema deep dive} guide.\n *\n * # Example definitions\n *\n * Allow `paragraph` in roots and block quotes:\n *\n *\t\tschema.register( 'paragraph', {\n *\t\t\tallowIn: [ '$root', 'blockQuote' ],\n *\t\t\tisBlock: true\n *\t\t} );\n *\n * Allow `paragraph` everywhere where `$block` is allowed (i.e. in `$root`):\n *\n *\t\tschema.register( 'paragraph', {\n *\t\t\tallowWhere: '$block',\n *\t\t\tisBlock: true\n *\t\t} );\n *\n * Make `image` a block object, which is allowed everywhere where `$block` is.\n * Also, allow `src` and `alt` attributes in it:\n *\n *\t\tschema.register( 'image', {\n *\t\t\tallowWhere: '$block',\n *\t\t\tallowAttributes: [ 'src', 'alt' ],\n *\t\t\tisBlock: true,\n *\t\t\tisObject: true\n *\t\t} );\n *\n * Make `caption` allowed in `image` and make it allow all the content of `$block`s (usually, `$text`).\n * Also, mark it as a limit element so it cannot be split:\n *\n *\t\tschema.register( 'caption', {\n *\t\t\tallowIn: 'image',\n *\t\t\tallowContentOf: '$block',\n *\t\t\tisLimit: true\n *\t\t} );\n *\n * Make `listItem` inherit all from `$block` but also allow additional attributes:\n *\n *\t\tschema.register( 'listItem', {\n *\t\t\tinheritAllFrom: '$block',\n *\t\t\tallowAttributes: [ 'listType', 'listIndent' ]\n *\t\t} );\n *\n * Which translates to:\n *\n *\t\tschema.register( 'listItem', {\n *\t\t\tallowWhere: '$block',\n *\t\t\tallowContentOf: '$block',\n *\t\t\tallowAttributesOf: '$block',\n *\t\t\tinheritTypesFrom: '$block',\n *\t\t\tallowAttributes: [ 'listType', 'listIndent' ]\n *\t\t} );\n *\n * # Tips\n *\n * * Check schema definitions of existing features to see how they are defined.\n * * If you want to publish your feature so other developers can use it, try to use\n * generic items as much as possible.\n * * Keep your model clean. Limit it to the actual data and store information in a normalized way.\n * * Remember about defining the `is*` properties. They do not affect the allowed structures, but they can\n * affect how the editor features treat your elements.\n *\n * @typedef {Object} module:engine/model/schema~SchemaItemDefinition\n *\n * @property {String|Array.<String>} allowIn Defines in which other items this item will be allowed.\n * @property {String|Array.<String>} allowAttributes Defines allowed attributes of the given item.\n * @property {String|Array.<String>} allowContentOf Inherits \"allowed children\" from other items.\n * @property {String|Array.<String>} allowWhere Inherits \"allowed in\" from other items.\n * @property {String|Array.<String>} allowAttributesOf Inherits attributes from other items.\n * @property {String|Array.<String>} inheritTypesFrom Inherits `is*` properties of other items.\n * @property {String} inheritAllFrom A shorthand for `allowContentOf`, `allowWhere`, `allowAttributesOf`, `inheritTypesFrom`.\n *\n * @property {Boolean} isBlock\n * Whether this item is paragraph-like. Generally speaking, content is usually made out of blocks\n * like paragraphs, list items, images, headings, etc. All these elements are marked as blocks. A block\n * should not allow another block inside. Note: There is also the `$block` generic item which has `isBlock` set to `true`.\n * Most block type items will inherit from `$block` (through `inheritAllFrom`).\n *\n * Read more about the block elements in the\n * {@glink framework/guides/deep-dive/schema#block-elements Block elements} section of the Schema deep dive} guide.\n *\n * @property {Boolean} isInline\n * Whether an item is \"text-like\" and should be treated as an inline node. Examples of inline elements:\n * `$text`, `softBreak` (`<br>`), etc.\n *\n * Read more about the inline elements in the\n * {@glink framework/guides/deep-dive/schema#inline-elements Inline elements} section of the Schema deep dive} guide.\n *\n * @property {Boolean} isLimit\n * It can be understood as whether this element should not be split by <kbd>Enter</kbd>.\n * Examples of limit elements: `$root`, table cell, image caption, etc. In other words, all actions that happen inside\n * a limit element are limited to its content.\n *\n * Read more about the limit elements in the\n * {@glink framework/guides/deep-dive/schema#limit-elements Limit elements} section of the Schema deep dive} guide.\n *\n * @property {Boolean} isObject\n * Whether an item is \"self-contained\" and should be treated as a whole. Examples of object elements:\n * `image`, `table`, `video`, etc.\n *\n * **Note:** An object is also a limit, so\n * {@link module:engine/model/schema~Schema#isLimit `isLimit()`} returns `true` for object elements automatically.\n *\n * Read more about the object elements in the\n * {@glink framework/guides/deep-dive/schema#object-elements Object elements} section of the Schema deep dive} guide.\n *\n * @property {Boolean} isSelectable\n * `true` when an element should be selectable as a whole by the user. Examples of selectable elements: `image`, `table`, `tableCell`, etc.\n *\n * **Note:** An object is also a selectable element, so\n * {@link module:engine/model/schema~Schema#isSelectable `isSelectable()`} returns `true` for object elements automatically.\n *\n * Read more about selectable elements in the\n * {@glink framework/guides/deep-dive/schema#selectable-elements Selectable elements} section of the Schema deep dive} guide.\n *\n * @property {Boolean} isContent\n * An item is a content when it always finds its way to the editor data output regardless of the number and type of its descendants.\n * Examples of content elements: `$text`, `image`, `table`, etc. (but not `paragraph`, `heading1` or `tableCell`).\n *\n * **Note:** An object is also a content element, so\n * {@link module:engine/model/schema~Schema#isContent `isContent()`} returns `true` for object elements automatically.\n *\n * Read more about content elements in the\n * {@glink framework/guides/deep-dive/schema#content-elements Content elements} section of the Schema deep dive} guide.\n */\n\n/**\n * A simplified version of {@link module:engine/model/schema~SchemaItemDefinition} after\n * compilation by the {@link module:engine/model/schema~Schema schema}.\n * Rules fed to the schema by {@link module:engine/model/schema~Schema#register}\n * and {@link module:engine/model/schema~Schema#extend} methods are defined in the\n * {@link module:engine/model/schema~SchemaItemDefinition} format.\n * Later on, they are compiled to `SchemaCompiledItemDefinition` so when you use e.g.\n * the {@link module:engine/model/schema~Schema#getDefinition} method you get the compiled version.\n *\n * The compiled version contains only the following properties:\n *\n * * The `name` property,\n * * The `is*` properties,\n * * The `allowIn` array,\n * * The `allowAttributes` array.\n *\n * @typedef {Object} module:engine/model/schema~SchemaCompiledItemDefinition\n */\n\n/**\n * A schema context &mdash; a list of ancestors of a given position in the document.\n *\n * Considering such position:\n *\n *\t\t<$root>\n *\t\t\t<blockQuote>\n *\t\t\t\t<paragraph>\n *\t\t\t\t\t^\n *\t\t\t\t</paragraph>\n *\t\t\t</blockQuote>\n *\t\t</$root>\n *\n * The context of this position is its {@link module:engine/model/position~Position#getAncestors lists of ancestors}:\n *\n *\t\t[ rootElement, blockQuoteElement, paragraphElement ]\n *\n * Contexts are used in the {@link module:engine/model/schema~Schema#event:checkChild `Schema#checkChild`} and\n * {@link module:engine/model/schema~Schema#event:checkAttribute `Schema#checkAttribute`} events as a definition\n * of a place in the document where the check occurs. The context instances are created based on the first arguments\n * of the {@link module:engine/model/schema~Schema#checkChild `Schema#checkChild()`} and\n * {@link module:engine/model/schema~Schema#checkAttribute `Schema#checkAttribute()`} methods so when\n * using these methods you need to use {@link module:engine/model/schema~SchemaContextDefinition}s.\n */\nexport class SchemaContext {\n\t/**\n\t * Creates an instance of the context.\n\t *\n\t * @param {module:engine/model/schema~SchemaContextDefinition} context\n\t */\n\tconstructor( context ) {\n\t\tif ( context instanceof SchemaContext ) {\n\t\t\treturn context;\n\t\t}\n\n\t\tif ( typeof context == 'string' ) {\n\t\t\tcontext = [ context ];\n\t\t} else if ( !Array.isArray( context ) ) {\n\t\t\t// `context` is item or position.\n\t\t\t// Position#getAncestors() doesn't accept any parameters but it works just fine here.\n\t\t\tcontext = context.getAncestors( { includeSelf: true } );\n\t\t}\n\n\t\tif ( context[ 0 ] && typeof context[ 0 ] != 'string' && context[ 0 ].is( 'documentFragment' ) ) {\n\t\t\tcontext.shift();\n\t\t}\n\n\t\tthis._items = context.map( mapContextItem );\n\t}\n\n\t/**\n\t * The number of items.\n\t *\n\t * @type {Number}\n\t */\n\tget length() {\n\t\treturn this._items.length;\n\t}\n\n\t/**\n\t * The last item (the lowest node).\n\t *\n\t * @type {module:engine/model/schema~SchemaContextItem}\n\t */\n\tget last() {\n\t\treturn this._items[ this._items.length - 1 ];\n\t}\n\n\t/**\n\t * Iterable interface.\n\t *\n\t * Iterates over all context items.\n\t *\n\t * @returns {Iterable.<module:engine/model/schema~SchemaContextItem>}\n\t */\n\t[ Symbol.iterator ]() {\n\t\treturn this._items[ Symbol.iterator ]();\n\t}\n\n\t/**\n\t * Returns a new schema context instance with an additional item.\n\t *\n\t * Item can be added as:\n\t *\n\t * \t\tconst context = new SchemaContext( [ '$root' ] );\n\t *\n\t * \t\t// An element.\n\t * \t\tconst fooElement = writer.createElement( 'fooElement' );\n\t * \t\tconst newContext = context.push( fooElement ); // [ '$root', 'fooElement' ]\n\t *\n\t * \t\t// A text node.\n\t * \t\tconst text = writer.createText( 'foobar' );\n\t * \t\tconst newContext = context.push( text ); // [ '$root', '$text' ]\n\t *\n\t * \t\t// A string (element name).\n\t * \t\tconst newContext = context.push( 'barElement' ); // [ '$root', 'barElement' ]\n\t *\n\t * **Note** {@link module:engine/model/node~Node} that is already in the model tree will be added as the only item\n\t * (without ancestors).\n\t *\n\t * @param {String|module:engine/model/node~Node|Array<String|module:engine/model/node~Node>} item An item that will be added\n\t * to the current context.\n\t * @returns {module:engine/model/schema~SchemaContext} A new schema context instance with an additional item.\n\t */\n\tpush( item ) {\n\t\tconst ctx = new SchemaContext( [ item ] );\n\n\t\tctx._items = [ ...this._items, ...ctx._items ];\n\n\t\treturn ctx;\n\t}\n\n\t/**\n\t * Gets an item on the given index.\n\t *\n\t * @returns {module:engine/model/schema~SchemaContextItem}\n\t */\n\tgetItem( index ) {\n\t\treturn this._items[ index ];\n\t}\n\n\t/**\n\t * Returns the names of items.\n\t *\n\t * @returns {Iterable.<String>}\n\t */\n\t* getNames() {\n\t\tyield* this._items.map( item => item.name );\n\t}\n\n\t/**\n\t * Checks whether the context ends with the given nodes.\n\t *\n\t *\t\tconst ctx = new SchemaContext( [ rootElement, paragraphElement, textNode ] );\n\t *\n\t *\t\tctx.endsWith( '$text' ); // -> true\n\t *\t\tctx.endsWith( 'paragraph $text' ); // -> true\n\t *\t\tctx.endsWith( '$root' ); // -> false\n\t *\t\tctx.endsWith( 'paragraph' ); // -> false\n\t *\n\t * @param {String} query\n\t * @returns {Boolean}\n\t */\n\tendsWith( query ) {\n\t\treturn Array.from( this.getNames() ).join( ' ' ).endsWith( query );\n\t}\n\n\t/**\n\t * Checks whether the context starts with the given nodes.\n\t *\n\t *\t\tconst ctx = new SchemaContext( [ rootElement, paragraphElement, textNode ] );\n\t *\n\t *\t\tctx.endsWith( '$root' ); // -> true\n\t *\t\tctx.endsWith( '$root paragraph' ); // -> true\n\t *\t\tctx.endsWith( '$text' ); // -> false\n\t *\t\tctx.endsWith( 'paragraph' ); // -> false\n\t *\n\t * @param {String} query\n\t * @returns {Boolean}\n\t */\n\tstartsWith( query ) {\n\t\treturn Array.from( this.getNames() ).join( ' ' ).startsWith( query );\n\t}\n}\n\n/**\n * The definition of a {@link module:engine/model/schema~SchemaContext schema context}.\n *\n * Contexts can be created in multiple ways:\n *\n * * By defining a **node** – in this cases this node and all its ancestors will be used.\n * * By defining a **position** in the document – in this case all its ancestors will be used.\n * * By defining an **array of nodes** – in this case this array defines the entire context.\n * * By defining a **name of node** - in this case node will be \"mocked\". It is not recommended because context\n * will be unrealistic (e.g. attributes of these nodes are not specified). However, at times this may be the only\n * way to define the context (e.g. when checking some hypothetical situation).\n * * By defining an **array of node names** (potentially, mixed with real nodes) – The same as **name of node**\n * but it is possible to create a path.\n * * By defining a {@link module:engine/model/schema~SchemaContext} instance - in this case the same instance as provided\n * will be return.\n *\n * Examples of context definitions passed to the {@link module:engine/model/schema~Schema#checkChild `Schema#checkChild()`}\n * method:\n *\n *\t\t// Assuming that we have a $root > blockQuote > paragraph structure, the following code\n *\t\t// will check node 'foo' in the following context:\n *\t\t// [ rootElement, blockQuoteElement, paragraphElement ]\n *\t\tconst contextDefinition = paragraphElement;\n * \t\tconst childToCheck = 'foo';\n *\t\tschema.checkChild( contextDefinition, childToCheck );\n *\n *\t\t// Also check in [ rootElement, blockQuoteElement, paragraphElement ].\n *\t\tschema.checkChild( model.createPositionAt( paragraphElement, 0 ), 'foo' );\n *\n *\t\t// Check in [ rootElement, paragraphElement ].\n *\t\tschema.checkChild( [ rootElement, paragraphElement ], 'foo' );\n *\n *\t\t// Check only fakeParagraphElement.\n *\t\tschema.checkChild( 'paragraph', 'foo' );\n *\n *\t\t// Check in [ fakeRootElement, fakeBarElement, paragraphElement ].\n *\t\tschema.checkChild( [ '$root', 'bar', paragraphElement ], 'foo' );\n *\n * All these `checkChild()` calls will fire {@link module:engine/model/schema~Schema#event:checkChild `Schema#checkChild`}\n * events in which `args[ 0 ]` is an instance of the context. Therefore, you can write a listener like this:\n *\n *\t\tschema.on( 'checkChild', ( evt, args ) => {\n *\t\t\tconst ctx = args[ 0 ];\n *\n *\t\t\tconsole.log( Array.from( ctx.getNames() ) );\n *\t\t} );\n *\n * Which will log the following:\n *\n *\t\t[ '$root', 'blockQuote', 'paragraph' ]\n *\t\t[ '$root', 'paragraph' ]\n *\t\t[ '$root', 'bar', 'paragraph' ]\n *\n * Note: When using the {@link module:engine/model/schema~Schema#checkAttribute `Schema#checkAttribute()`} method\n * you may want to check whether a text node may have an attribute. A {@link module:engine/model/text~Text} is a\n * correct way to define a context so you can do this:\n *\n *\t\tschema.checkAttribute( textNode, 'bold' );\n *\n * But sometimes you want to check whether a text at a given position might've had some attribute,\n * in which case you can create a context by missing an array of elements with a `'$text'` string:\n *\n *\t\t// Check in [ rootElement, paragraphElement, textNode ].\n *\t\tschema.checkChild( [ ...positionInParagraph.getAncestors(), '$text' ], 'bold' );\n *\n * @typedef {module:engine/model/node~Node|module:engine/model/position~Position|module:engine/model/schema~SchemaContext|\n * String|Array.<String|module:engine/model/node~Node>} module:engine/model/schema~SchemaContextDefinition\n */\n\n/**\n * An item of the {@link module:engine/model/schema~SchemaContext schema context}.\n *\n * It contains 3 properties:\n *\n * * `name` – the name of this item,\n * * `* getAttributeKeys()` – a generator of keys of item attributes,\n * * `getAttribute( keyName )` – a method to get attribute values.\n *\n * The context item interface is a highly simplified version of {@link module:engine/model/node~Node} and its role\n * is to expose only the information which schema checks are able to provide (which is the name of the node and\n * node's attributes).\n *\n *\t\tschema.on( 'checkChild', ( evt, args ) => {\n *\t\t\tconst ctx = args[ 0 ];\n *\t\t\tconst firstItem = ctx.getItem( 0 );\n *\n *\t\t\tconsole.log( firstItem.name ); // -> '$root'\n *\t\t\tconsole.log( firstItem.getAttribute( 'foo' ) ); // -> 'bar'\n *\t\t\tconsole.log( Array.from( firstItem.getAttributeKeys() ) ); // -> [ 'foo', 'faa' ]\n *\t\t} );\n *\n * @typedef {Object} module:engine/model/schema~SchemaContextItem\n */\n\n/**\n * A structure containing additional metadata describing the attribute.\n *\n * See {@link module:engine/model/schema~Schema#setAttributeProperties `Schema#setAttributeProperties()`} for usage examples.\n *\n * @typedef {Object} module:engine/model/schema~AttributeProperties\n * @property {Boolean} [isFormatting] Indicates that the attribute should be considered as a visual formatting, like `bold`, `italic` or\n * `fontSize` rather than semantic attribute (such as `src`, `listType`, etc.). For example, it is used by the \"Remove format\" feature.\n * @property {Boolean} [copyOnEnter] Indicates that given text attribute should be copied to the next block when enter is pressed.\n */\n\nfunction compileBaseItemRule( sourceItemRules, itemName ) {\n\tconst itemRule = {\n\t\tname: itemName,\n\n\t\tallowIn: [],\n\t\tallowContentOf: [],\n\t\tallowWhere: [],\n\n\t\tallowAttributes: [],\n\t\tallowAttributesOf: [],\n\n\t\tinheritTypesFrom: []\n\t};\n\n\tcopyTypes( sourceItemRules, itemRule );\n\n\tcopyProperty( sourceItemRules, itemRule, 'allowIn' );\n\tcopyProperty( sourceItemRules, itemRule, 'allowContentOf' );\n\tcopyProperty( sourceItemRules, itemRule, 'allowWhere' );\n\n\tcopyProperty( sourceItemRules, itemRule, 'allowAttributes' );\n\tcopyProperty( sourceItemRules, itemRule, 'allowAttributesOf' );\n\n\tcopyProperty( sourceItemRules, itemRule, 'inheritTypesFrom' );\n\n\tmakeInheritAllWork( sourceItemRules, itemRule );\n\n\treturn itemRule;\n}\n\nfunction compileAllowContentOf( compiledDefinitions, itemName ) {\n\tfor ( const allowContentOfItemName of compiledDefinitions[ itemName ].allowContentOf ) {\n\t\t// The allowContentOf property may point to an unregistered element.\n\t\tif ( compiledDefinitions[ allowContentOfItemName ] ) {\n\t\t\tconst allowedChildren = getAllowedChildren( compiledDefinitions, allowContentOfItemName );\n\n\t\t\tallowedChildren.forEach( allowedItem => {\n\t\t\t\tallowedItem.allowIn.push( itemName );\n\t\t\t} );\n\t\t}\n\t}\n\n\tdelete compiledDefinitions[ itemName ].allowContentOf;\n}\n\nfunction compileAllowWhere( compiledDefinitions, itemName ) {\n\tfor ( const allowWhereItemName of compiledDefinitions[ itemName ].allowWhere ) {\n\t\tconst inheritFrom = compiledDefinitions[ allowWhereItemName ];\n\n\t\t// The allowWhere property may point to an unregistered element.\n\t\tif ( inheritFrom ) {\n\t\t\tconst allowedIn = inheritFrom.allowIn;\n\n\t\t\tcompiledDefinitions[ itemName ].allowIn.push( ...allowedIn );\n\t\t}\n\t}\n\n\tdelete compiledDefinitions[ itemName ].allowWhere;\n}\n\nfunction compileAllowAttributesOf( compiledDefinitions, itemName ) {\n\tfor ( const allowAttributeOfItem of compiledDefinitions[ itemName ].allowAttributesOf ) {\n\t\tconst inheritFrom = compiledDefinitions[ allowAttributeOfItem ];\n\n\t\tif ( inheritFrom ) {\n\t\t\tconst inheritAttributes = inheritFrom.allowAttributes;\n\n\t\t\tcompiledDefinitions[ itemName ].allowAttributes.push( ...inheritAttributes );\n\t\t}\n\t}\n\n\tdelete compiledDefinitions[ itemName ].allowAttributesOf;\n}\n\nfunction compileInheritPropertiesFrom( compiledDefinitions, itemName ) {\n\tconst item = compiledDefinitions[ itemName ];\n\n\tfor ( const inheritPropertiesOfItem of item.inheritTypesFrom ) {\n\t\tconst inheritFrom = compiledDefinitions[ inheritPropertiesOfItem ];\n\n\t\tif ( inheritFrom ) {\n\t\t\tconst typeNames = Object.keys( inheritFrom ).filter( name => name.startsWith( 'is' ) );\n\n\t\t\tfor ( const name of typeNames ) {\n\t\t\t\tif ( !( name in item ) ) {\n\t\t\t\t\titem[ name ] = inheritFrom[ name ];\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\t}\n\n\tdelete item.inheritTypesFrom;\n}\n\n// Remove items which weren't registered (because it may break some checks or we'd need to complicate them).\n// Make sure allowIn doesn't contain repeated values.\nfunction cleanUpAllowIn( compiledDefinitions, itemName ) {\n\tconst itemRule = compiledDefinitions[ itemName ];\n\tconst existingItems = itemRule.allowIn.filter( itemToCheck => compiledDefinitions[ itemToCheck ] );\n\n\titemRule.allowIn = Array.from( new Set( existingItems ) );\n}\n\nfunction cleanUpAllowAttributes( compiledDefinitions, itemName ) {\n\tconst itemRule = compiledDefinitions[ itemName ];\n\n\titemRule.allowAttributes = Array.from( new Set( itemRule.allowAttributes ) );\n}\n\nfunction copyTypes( sourceItemRules, itemRule ) {\n\tfor ( const sourceItemRule of sourceItemRules ) {\n\t\tconst typeNames = Object.keys( sourceItemRule ).filter( name => name.startsWith( 'is' ) );\n\n\t\tfor ( const name of typeNames ) {\n\t\t\titemRule[ name ] = sourceItemRule[ name ];\n\t\t}\n\t}\n}\n\nfunction copyProperty( sourceItemRules, itemRule, propertyName ) {\n\tfor ( const sourceItemRule of sourceItemRules ) {\n\t\tif ( typeof sourceItemRule[ propertyName ] == 'string' ) {\n\t\t\titemRule[ propertyName ].push( sourceItemRule[ propertyName ] );\n\t\t} else if ( Array.isArray( sourceItemRule[ propertyName ] ) ) {\n\t\t\titemRule[ propertyName ].push( ...sourceItemRule[ propertyName ] );\n\t\t}\n\t}\n}\n\nfunction makeInheritAllWork( sourceItemRules, itemRule ) {\n\tfor ( const sourceItemRule of sourceItemRules ) {\n\t\tconst inheritFrom = sourceItemRule.inheritAllFrom;\n\n\t\tif ( inheritFrom ) {\n\t\t\titemRule.allowContentOf.push( inheritFrom );\n\t\t\titemRule.allowWhere.push( inheritFrom );\n\t\t\titemRule.allowAttributesOf.push( inheritFrom );\n\t\t\titemRule.inheritTypesFrom.push( inheritFrom );\n\t\t}\n\t}\n}\n\nfunction getAllowedChildren( compiledDefinitions, itemName ) {\n\tconst itemRule = compiledDefinitions[ itemName ];\n\n\treturn getValues( compiledDefinitions ).filter( def => def.allowIn.includes( itemRule.name ) );\n}\n\nfunction getValues( obj ) {\n\treturn Object.keys( obj ).map( key => obj[ key ] );\n}\n\nfunction mapContextItem( ctxItem ) {\n\tif ( typeof ctxItem == 'string' ) {\n\t\treturn {\n\t\t\tname: ctxItem,\n\n\t\t\t* getAttributeKeys() {},\n\n\t\t\tgetAttribute() {}\n\t\t};\n\t} else {\n\t\treturn {\n\t\t\t// '$text' means text nodes and text proxies.\n\t\t\tname: ctxItem.is( 'element' ) ? ctxItem.name : '$text',\n\n\t\t\t* getAttributeKeys() {\n\t\t\t\tyield* ctxItem.getAttributeKeys();\n\t\t\t},\n\n\t\t\tgetAttribute( key ) {\n\t\t\t\treturn ctxItem.getAttribute( key );\n\t\t\t}\n\t\t};\n\t}\n}\n\n// Generator function returning values from provided walkers, switching between them at each iteration. If only one walker\n// is provided it will return data only from that walker.\n//\n// @param {module:engine/module/treewalker~TreeWalker} [backward] Walker iterating in backward direction.\n// @param {module:engine/module/treewalker~TreeWalker} [forward] Walker iterating in forward direction.\n// @returns {Iterable.<Object>} Object returned at each iteration contains `value` and `walker` (informing which walker returned\n// given value) fields.\nfunction* combineWalkers( backward, forward ) {\n\tlet done = false;\n\n\twhile ( !done ) {\n\t\tdone = true;\n\n\t\tif ( backward ) {\n\t\t\tconst step = backward.next();\n\n\t\t\tif ( !step.done ) {\n\t\t\t\tdone = false;\n\t\t\t\tyield {\n\t\t\t\t\twalker: backward,\n\t\t\t\t\tvalue: step.value\n\t\t\t\t};\n\t\t\t}\n\t\t}\n\n\t\tif ( forward ) {\n\t\t\tconst step = forward.next();\n\n\t\t\tif ( !step.done ) {\n\t\t\t\tdone = false;\n\t\t\t\tyield {\n\t\t\t\t\twalker: forward,\n\t\t\t\t\tvalue: step.value\n\t\t\t\t};\n\t\t\t}\n\t\t}\n\t}\n}\n\n// Takes an array of non-intersecting ranges. For each of them gets minimal flat ranges covering that range and returns\n// all those minimal flat ranges.\n//\n// @param {Array.<module:engine/model/range~Range>} ranges Ranges to process.\n// @returns {Iterable.<module:engine/model/range~Range>} Minimal flat ranges of given `ranges`.\nfunction* convertToMinimalFlatRanges( ranges ) {\n\tfor ( const range of ranges ) {\n\t\tyield* range.getMinimalFlatRanges();\n\t}\n}\n\nfunction removeDisallowedAttributeFromNode( schema, node, writer ) {\n\tfor ( const attribute of node.getAttributeKeys() ) {\n\t\tif ( !schema.checkAttribute( node, attribute ) ) {\n\t\t\twriter.removeAttribute( attribute, node );\n\t\t}\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module engine/conversion/upcastdispatcher\n */\n\nimport ViewConsumable from './viewconsumable';\nimport ModelRange from '../model/range';\nimport ModelPosition from '../model/position';\nimport { SchemaContext } from '../model/schema';\nimport { isParagraphable, wrapInParagraph } from '../model/utils/autoparagraphing';\n\nimport CKEditorError from '@ckeditor/ckeditor5-utils/src/ckeditorerror';\nimport EmitterMixin from '@ckeditor/ckeditor5-utils/src/emittermixin';\nimport mix from '@ckeditor/ckeditor5-utils/src/mix';\n\n/**\n * Upcast dispatcher is a central point of the view-to-model conversion, which is a process of\n * converting a given {@link module:engine/view/documentfragment~DocumentFragment view document fragment} or\n * {@link module:engine/view/element~Element view element} into a correct model structure.\n *\n * During the conversion process, the dispatcher fires events for all {@link module:engine/view/node~Node view nodes}\n * from the converted view document fragment.\n * Special callbacks called \"converters\" should listen to these events in order to convert the view nodes.\n *\n * The second parameter of the callback is the `data` object with the following properties:\n *\n * * `data.viewItem` contains a {@link module:engine/view/node~Node view node} or a\n * {@link module:engine/view/documentfragment~DocumentFragment view document fragment}\n * that is converted at the moment and might be handled by the callback.\n * * `data.modelRange` is used to point to the result\n * of the current conversion (e.g. the element that is being inserted)\n * and is always a {@link module:engine/model/range~Range} when the conversion succeeds.\n * * `data.modelCursor` is a {@link module:engine/model/position~Position position} on which the converter should insert\n * the newly created items.\n *\n * The third parameter of the callback is an instance of {@link module:engine/conversion/upcastdispatcher~UpcastConversionApi}\n * which provides additional tools for converters.\n *\n * You can read more about conversion in the following guides:\n *\n * * {@glink framework/guides/deep-dive/conversion/conversion-introduction Advanced conversion concepts &mdash; attributes}\n * * {@glink framework/guides/deep-dive/conversion/custom-element-conversion Custom element conversion}\n *\n * Examples of event-based converters:\n *\n *\t\t// A converter for links (<a>).\n *\t\teditor.data.upcastDispatcher.on( 'element:a', ( evt, data, conversionApi ) => {\n *\t\t\tif ( conversionApi.consumable.consume( data.viewItem, { name: true, attributes: [ 'href' ] } ) ) {\n *\t\t\t\t// The <a> element is inline and is represented by an attribute in the model.\n *\t\t\t\t// This is why you need to convert only children.\n *\t\t\t\tconst { modelRange } = conversionApi.convertChildren( data.viewItem, data.modelCursor );\n *\n *\t\t\t\tfor ( let item of modelRange.getItems() ) {\n *\t\t\t\t\tif ( conversionApi.schema.checkAttribute( item, 'linkHref' ) ) {\n *\t\t\t\t\t\tconversionApi.writer.setAttribute( 'linkHref', data.viewItem.getAttribute( 'href' ), item );\n *\t\t\t\t\t}\n *\t\t\t\t}\n *\t\t\t}\n *\t\t} );\n *\n *\t\t// Convert <p> element's font-size style.\n *\t\t// Note: You should use a low-priority observer in order to ensure that\n *\t\t// it is executed after the element-to-element converter.\n *\t\teditor.data.upcastDispatcher.on( 'element:p', ( evt, data, conversionApi ) => {\n *\t\t\tconst { consumable, schema, writer } = conversionApi;\n *\n *\t\t\tif ( !consumable.consume( data.viewItem, { style: 'font-size' } ) ) {\n *\t\t\t\treturn;\n *\t\t\t}\n *\n *\t\t\tconst fontSize = data.viewItem.getStyle( 'font-size' );\n *\n *\t\t\t// Do not go for the model element after data.modelCursor because it might happen\n *\t\t\t// that a single view element was converted to multiple model elements. Get all of them.\n *\t\t\tfor ( const item of data.modelRange.getItems( { shallow: true } ) ) {\n *\t\t\t\tif ( schema.checkAttribute( item, 'fontSize' ) ) {\n *\t\t\t\t\twriter.setAttribute( 'fontSize', fontSize, item );\n *\t\t\t\t}\n *\t\t\t}\n *\t\t}, { priority: 'low' } );\n *\n *\t\t// Convert all elements which have no custom converter into a paragraph (autoparagraphing).\n *\t\teditor.data.upcastDispatcher.on( 'element', ( evt, data, conversionApi ) => {\n *\t\t\t// Check if an element can be converted.\n *\t\t\tif ( !conversionApi.consumable.test( data.viewItem, { name: data.viewItem.name } ) ) {\n *\t\t\t\t// When an element is already consumed by higher priority converters, do nothing.\n *\t\t\t\treturn;\n *\t\t\t}\n *\n *\t\t\tconst paragraph = conversionApi.writer.createElement( 'paragraph' );\n *\n *\t\t\t// Try to safely insert a paragraph at the model cursor - it will find an allowed parent for the current element.\n *\t\t\tif ( !conversionApi.safeInsert( paragraph, data.modelCursor ) ) {\n *\t\t\t\t// When an element was not inserted, it means that you cannot insert a paragraph at this position.\n *\t\t\t\treturn;\n *\t\t\t}\n *\n *\t\t\t// Consume the inserted element.\n *\t\t\tconversionApi.consumable.consume( data.viewItem, { name: data.viewItem.name } ) );\n *\n *\t\t\t// Convert the children to a paragraph.\n *\t\t\tconst { modelRange } = conversionApi.convertChildren( data.viewItem,  paragraph ) );\n *\n *\t\t\t// Update `modelRange` and `modelCursor` in the `data` as a conversion result.\n *\t\t\tconversionApi.updateConversionResult( paragraph, data );\n *\t\t}, { priority: 'low' } );\n *\n * @mixes module:utils/emittermixin~EmitterMixin\n * @fires viewCleanup\n * @fires element\n * @fires text\n * @fires documentFragment\n */\nexport default class UpcastDispatcher {\n\t/**\n\t * Creates an upcast dispatcher that operates using the passed API.\n\t *\n\t * @see module:engine/conversion/upcastdispatcher~UpcastConversionApi\n\t * @param {Object} [conversionApi] Additional properties for an interface that will be passed to events fired\n\t * by the upcast dispatcher.\n\t */\n\tconstructor( conversionApi = {} ) {\n\t\t/**\n\t\t * The list of elements that were created during splitting.\n\t\t *\n\t\t * After the conversion process the list is cleared.\n\t\t *\n\t\t * @private\n\t\t * @type {Map.<module:engine/model/element~Element,Array.<module:engine/model/element~Element>>}\n\t\t */\n\t\tthis._splitParts = new Map();\n\n\t\t/**\n\t\t * The list of cursor parent elements that were created during splitting.\n\t\t *\n\t\t * After the conversion process the list is cleared.\n\t\t *\n\t\t * @private\n\t\t * @type {Map.<module:engine/model/element~Element,Array.<module:engine/model/element~Element>>}\n\t\t */\n\t\tthis._cursorParents = new Map();\n\n\t\t/**\n\t\t * The position in the temporary structure where the converted content is inserted. The structure reflects the context of\n\t\t * the target position where the content will be inserted. This property is built based on the context parameter of the\n\t\t * convert method.\n\t\t *\n\t\t * @private\n\t\t * @type {module:engine/model/position~Position|null}\n\t\t */\n\t\tthis._modelCursor = null;\n\n\t\t/**\n\t\t * An interface passed by the dispatcher to the event callbacks.\n\t\t *\n\t\t * @member {module:engine/conversion/upcastdispatcher~UpcastConversionApi}\n\t\t */\n\t\tthis.conversionApi = Object.assign( {}, conversionApi );\n\n\t\t// The below methods are bound to this `UpcastDispatcher` instance and set on `conversionApi`.\n\t\t// This way only a part of `UpcastDispatcher` API is exposed.\n\t\tthis.conversionApi.convertItem = this._convertItem.bind( this );\n\t\tthis.conversionApi.convertChildren = this._convertChildren.bind( this );\n\t\tthis.conversionApi.safeInsert = this._safeInsert.bind( this );\n\t\tthis.conversionApi.updateConversionResult = this._updateConversionResult.bind( this );\n\t\t// Advanced API - use only if custom position handling is needed.\n\t\tthis.conversionApi.splitToAllowedParent = this._splitToAllowedParent.bind( this );\n\t\tthis.conversionApi.getSplitParts = this._getSplitParts.bind( this );\n\t}\n\n\t/**\n\t * Starts the conversion process. The entry point for the conversion.\n\t *\n\t * @fires element\n\t * @fires text\n\t * @fires documentFragment\n\t * @param {module:engine/view/documentfragment~DocumentFragment|module:engine/view/element~Element} viewItem\n\t * The part of the view to be converted.\n\t * @param {module:engine/model/writer~Writer} writer An instance of the model writer.\n\t * @param {module:engine/model/schema~SchemaContextDefinition} [context=['$root']] Elements will be converted according to this context.\n\t * @returns {module:engine/model/documentfragment~DocumentFragment} Model data that is the result of the conversion process\n\t * wrapped in `DocumentFragment`. Converted marker elements will be set as the document fragment's\n\t * {@link module:engine/model/documentfragment~DocumentFragment#markers static markers map}.\n\t */\n\tconvert( viewItem, writer, context = [ '$root' ] ) {\n\t\tthis.fire( 'viewCleanup', viewItem );\n\n\t\t// Create context tree and set position in the top element.\n\t\t// Items will be converted according to this position.\n\t\tthis._modelCursor = createContextTree( context, writer );\n\n\t\t// Store writer in conversion as a conversion API\n\t\t// to be sure that conversion process will use the same batch.\n\t\tthis.conversionApi.writer = writer;\n\n\t\t// Create consumable values list for conversion process.\n\t\tthis.conversionApi.consumable = ViewConsumable.createFrom( viewItem );\n\n\t\t// Custom data stored by converter for conversion process.\n\t\tthis.conversionApi.store = {};\n\n\t\t// Do the conversion.\n\t\tconst { modelRange } = this._convertItem( viewItem, this._modelCursor );\n\n\t\t// Conversion result is always a document fragment so let's create it.\n\t\tconst documentFragment = writer.createDocumentFragment();\n\n\t\t// When there is a conversion result.\n\t\tif ( modelRange ) {\n\t\t\t// Remove all empty elements that were create while splitting.\n\t\t\tthis._removeEmptyElements();\n\n\t\t\t// Move all items that were converted in context tree to the document fragment.\n\t\t\tfor ( const item of Array.from( this._modelCursor.parent.getChildren() ) ) {\n\t\t\t\twriter.append( item, documentFragment );\n\t\t\t}\n\n\t\t\t// Extract temporary markers elements from model and set as static markers collection.\n\t\t\tdocumentFragment.markers = extractMarkersFromModelFragment( documentFragment, writer );\n\t\t}\n\n\t\t// Clear context position.\n\t\tthis._modelCursor = null;\n\n\t\t// Clear split elements & parents lists.\n\t\tthis._splitParts.clear();\n\t\tthis._cursorParents.clear();\n\n\t\t// Clear conversion API.\n\t\tthis.conversionApi.writer = null;\n\t\tthis.conversionApi.store = null;\n\n\t\t// Return fragment as conversion result.\n\t\treturn documentFragment;\n\t}\n\n\t/**\n\t * @private\n\t * @see module:engine/conversion/upcastdispatcher~UpcastConversionApi#convertItem\n\t */\n\t_convertItem( viewItem, modelCursor ) {\n\t\tconst data = Object.assign( { viewItem, modelCursor, modelRange: null } );\n\n\t\tif ( viewItem.is( 'element' ) ) {\n\t\t\tthis.fire( 'element:' + viewItem.name, data, this.conversionApi );\n\t\t} else if ( viewItem.is( '$text' ) ) {\n\t\t\tthis.fire( 'text', data, this.conversionApi );\n\t\t} else {\n\t\t\tthis.fire( 'documentFragment', data, this.conversionApi );\n\t\t}\n\n\t\t// Handle incorrect conversion result.\n\t\tif ( data.modelRange && !( data.modelRange instanceof ModelRange ) ) {\n\t\t\t/**\n\t\t\t * Incorrect conversion result was dropped.\n\t\t\t *\n\t\t\t * {@link module:engine/model/range~Range Model range} should be a conversion result.\n\t\t\t *\n\t\t\t * @error view-conversion-dispatcher-incorrect-result\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'view-conversion-dispatcher-incorrect-result', this );\n\t\t}\n\n\t\treturn { modelRange: data.modelRange, modelCursor: data.modelCursor };\n\t}\n\n\t/**\n\t * @private\n\t * @see module:engine/conversion/upcastdispatcher~UpcastConversionApi#convertChildren\n\t */\n\t_convertChildren( viewItem, elementOrModelCursor ) {\n\t\tlet nextModelCursor = elementOrModelCursor.is( 'position' ) ?\n\t\t\telementOrModelCursor : ModelPosition._createAt( elementOrModelCursor, 0 );\n\n\t\tconst modelRange = new ModelRange( nextModelCursor );\n\n\t\tfor ( const viewChild of Array.from( viewItem.getChildren() ) ) {\n\t\t\tconst result = this._convertItem( viewChild, nextModelCursor );\n\n\t\t\tif ( result.modelRange instanceof ModelRange ) {\n\t\t\t\tmodelRange.end = result.modelRange.end;\n\t\t\t\tnextModelCursor = result.modelCursor;\n\t\t\t}\n\t\t}\n\n\t\treturn { modelRange, modelCursor: nextModelCursor };\n\t}\n\n\t/**\n\t * @private\n\t * @see module:engine/conversion/upcastdispatcher~UpcastConversionApi#safeInsert\n\t */\n\t_safeInsert( modelElement, position ) {\n\t\t// Find allowed parent for element that we are going to insert.\n\t\t// If current parent does not allow to insert element but one of the ancestors does\n\t\t// then split nodes to allowed parent.\n\t\tconst splitResult = this._splitToAllowedParent( modelElement, position );\n\n\t\t// When there is no split result it means that we can't insert element to model tree, so let's skip it.\n\t\tif ( !splitResult ) {\n\t\t\treturn false;\n\t\t}\n\n\t\t// Insert element on allowed position.\n\t\tthis.conversionApi.writer.insert( modelElement, splitResult.position );\n\n\t\treturn true;\n\t}\n\n\t/**\n\t * @private\n\t * @see module:engine/conversion/upcastdispatcher~UpcastConversionApi#updateConversionResult\n\t */\n\t_updateConversionResult( modelElement, data ) {\n\t\tconst parts = this._getSplitParts( modelElement );\n\n\t\tconst writer = this.conversionApi.writer;\n\n\t\t// Set conversion result range - only if not set already.\n\t\tif ( !data.modelRange ) {\n\t\t\tdata.modelRange = writer.createRange(\n\t\t\t\twriter.createPositionBefore( modelElement ),\n\t\t\t\twriter.createPositionAfter( parts[ parts.length - 1 ] )\n\t\t\t);\n\t\t}\n\n\t\tconst savedCursorParent = this._cursorParents.get( modelElement );\n\n\t\t// Now we need to check where the `modelCursor` should be.\n\t\tif ( savedCursorParent ) {\n\t\t\t// If we split parent to insert our element then we want to continue conversion in the new part of the split parent.\n\t\t\t//\n\t\t\t// before: <allowed><notAllowed>foo[]</notAllowed></allowed>\n\t\t\t// after:  <allowed><notAllowed>foo</notAllowed> <converted></converted> <notAllowed>[]</notAllowed></allowed>\n\n\t\t\tdata.modelCursor = writer.createPositionAt( savedCursorParent, 0 );\n\t\t} else {\n\t\t\t// Otherwise just continue after inserted element.\n\n\t\t\tdata.modelCursor = data.modelRange.end;\n\t\t}\n\t}\n\n\t/**\n\t * @private\n\t * @see module:engine/conversion/upcastdispatcher~UpcastConversionApi#splitToAllowedParent\n\t */\n\t_splitToAllowedParent( node, modelCursor ) {\n\t\tconst { schema, writer } = this.conversionApi;\n\n\t\t// Try to find allowed parent.\n\t\tlet allowedParent = schema.findAllowedParent( modelCursor, node );\n\n\t\tif ( allowedParent ) {\n\t\t\t// When current position parent allows to insert node then return this position.\n\t\t\tif ( allowedParent === modelCursor.parent ) {\n\t\t\t\treturn { position: modelCursor };\n\t\t\t}\n\n\t\t\t// When allowed parent is in context tree (it's outside the converted tree).\n\t\t\tif ( this._modelCursor.parent.getAncestors().includes( allowedParent ) ) {\n\t\t\t\tallowedParent = null;\n\t\t\t}\n\t\t}\n\n\t\tif ( !allowedParent ) {\n\t\t\t// Check if the node wrapped with a paragraph would be accepted by the schema.\n\t\t\tif ( !isParagraphable( modelCursor, node, schema ) ) {\n\t\t\t\treturn null;\n\t\t\t}\n\n\t\t\treturn {\n\t\t\t\tposition: wrapInParagraph( modelCursor, writer )\n\t\t\t};\n\t\t}\n\n\t\t// Split element to allowed parent.\n\t\tconst splitResult = this.conversionApi.writer.split( modelCursor, allowedParent );\n\n\t\t// Using the range returned by `model.Writer#split`, we will pair original elements with their split parts.\n\t\t//\n\t\t// The range returned from the writer spans \"over the split\" or, precisely saying, from the end of the original element (the one\n\t\t// that got split) to the beginning of the other part of that element:\n\t\t//\n\t\t// <limit><a><b><c>X[]Y</c></b><a></limit> ->\n\t\t// <limit><a><b><c>X[</c></b></a><a><b><c>]Y</c></b></a>\n\t\t//\n\t\t// After the split there cannot be any full node between the positions in `splitRange`. The positions are touching.\n\t\t// Also, because of how splitting works, it is easy to notice, that \"closing tags\" are in the reverse order than \"opening tags\".\n\t\t// Also, since we split all those elements, each of them has to have the other part.\n\t\t//\n\t\t// With those observations in mind, we will pair the original elements with their split parts by saving \"closing tags\" and matching\n\t\t// them with \"opening tags\" in the reverse order. For that we can use a stack.\n\t\tconst stack = [];\n\n\t\tfor ( const treeWalkerValue of splitResult.range.getWalker() ) {\n\t\t\tif ( treeWalkerValue.type == 'elementEnd' ) {\n\t\t\t\tstack.push( treeWalkerValue.item );\n\t\t\t} else {\n\t\t\t\t// There should not be any text nodes after the element is split, so the only other value is `elementStart`.\n\t\t\t\tconst originalPart = stack.pop();\n\t\t\t\tconst splitPart = treeWalkerValue.item;\n\n\t\t\t\tthis._registerSplitPair( originalPart, splitPart );\n\t\t\t}\n\t\t}\n\n\t\tconst cursorParent = splitResult.range.end.parent;\n\t\tthis._cursorParents.set( node, cursorParent );\n\n\t\treturn {\n\t\t\tposition: splitResult.position,\n\t\t\tcursorParent\n\t\t};\n\t}\n\n\t/**\n\t * Registers that a `splitPart` element is a split part of the `originalPart` element.\n\t *\n\t * The data set by this method is used by {@link #_getSplitParts} and {@link #_removeEmptyElements}.\n\t *\n\t * @private\n\t * @param {module:engine/model/element~Element} originalPart\n\t * @param {module:engine/model/element~Element} splitPart\n\t */\n\t_registerSplitPair( originalPart, splitPart ) {\n\t\tif ( !this._splitParts.has( originalPart ) ) {\n\t\t\tthis._splitParts.set( originalPart, [ originalPart ] );\n\t\t}\n\n\t\tconst list = this._splitParts.get( originalPart );\n\n\t\tthis._splitParts.set( splitPart, list );\n\t\tlist.push( splitPart );\n\t}\n\n\t/**\n\t * @private\n\t * @see module:engine/conversion/upcastdispatcher~UpcastConversionApi#getSplitParts\n\t */\n\t_getSplitParts( element ) {\n\t\tlet parts;\n\n\t\tif ( !this._splitParts.has( element ) ) {\n\t\t\tparts = [ element ];\n\t\t} else {\n\t\t\tparts = this._splitParts.get( element );\n\t\t}\n\n\t\treturn parts;\n\t}\n\n\t/**\n\t * Checks if there are any empty elements created while splitting and removes them.\n\t *\n\t * This method works recursively to re-check empty elements again after at least one element was removed in the initial call,\n\t * as some elements might have become empty after other empty elements were removed from them.\n\t *\n\t * @private\n\t */\n\t_removeEmptyElements() {\n\t\tlet anyRemoved = false;\n\n\t\tfor ( const element of this._splitParts.keys() ) {\n\t\t\tif ( element.isEmpty ) {\n\t\t\t\tthis.conversionApi.writer.remove( element );\n\t\t\t\tthis._splitParts.delete( element );\n\n\t\t\t\tanyRemoved = true;\n\t\t\t}\n\t\t}\n\n\t\tif ( anyRemoved ) {\n\t\t\tthis._removeEmptyElements();\n\t\t}\n\t}\n\n\t/**\n\t * Fired before the first conversion event, at the beginning of the upcast (view-to-model conversion) process.\n\t *\n\t * @event viewCleanup\n\t * @param {module:engine/view/documentfragment~DocumentFragment|module:engine/view/element~Element}\n\t * viewItem A part of the view to be converted.\n\t */\n\n\t/**\n\t * Fired when an {@link module:engine/view/element~Element} is converted.\n\t *\n\t * `element` is a namespace event for a class of events. Names of actually called events follow the pattern of\n\t * `element:<elementName>` where `elementName` is the name of the converted element. This way listeners may listen to\n\t * a conversion of all or just specific elements.\n\t *\n\t * @event element\n\t * @param {module:engine/conversion/upcastdispatcher~UpcastConversionData} data The conversion data. Keep in mind that this object is\n\t * shared by reference between all callbacks that will be called. This means that callbacks can override values if needed, and these\n\t * values will be available in other callbacks.\n\t * @param {module:engine/conversion/upcastdispatcher~UpcastConversionApi} conversionApi Conversion utilities to be used by the\n\t * callback.\n\t */\n\n\t/**\n\t * Fired when a {@link module:engine/view/text~Text} is converted.\n\t *\n\t * @event text\n\t * @see #event:element\n\t */\n\n\t/**\n\t * Fired when a {@link module:engine/view/documentfragment~DocumentFragment} is converted.\n\t *\n\t * @event documentFragment\n\t * @see #event:element\n\t */\n}\n\nmix( UpcastDispatcher, EmitterMixin );\n\n// Traverses given model item and searches elements which marks marker range. Found element is removed from\n// DocumentFragment but path of this element is stored in a Map which is then returned.\n//\n// @param {module:engine/view/documentfragment~DocumentFragment|module:engine/view/node~Node} modelItem Fragment of model.\n// @returns {Map<String, module:engine/model/range~Range>} List of static markers.\nfunction extractMarkersFromModelFragment( modelItem, writer ) {\n\tconst markerElements = new Set();\n\tconst markers = new Map();\n\n\t// Create ModelTreeWalker.\n\tconst range = ModelRange._createIn( modelItem ).getItems();\n\n\t// Walk through DocumentFragment and collect marker elements.\n\tfor ( const item of range ) {\n\t\t// Check if current element is a marker.\n\t\tif ( item.name == '$marker' ) {\n\t\t\tmarkerElements.add( item );\n\t\t}\n\t}\n\n\t// Walk through collected marker elements store its path and remove its from the DocumentFragment.\n\tfor ( const markerElement of markerElements ) {\n\t\tconst markerName = markerElement.getAttribute( 'data-name' );\n\t\tconst currentPosition = writer.createPositionBefore( markerElement );\n\n\t\t// When marker of given name is not stored it means that we have found the beginning of the range.\n\t\tif ( !markers.has( markerName ) ) {\n\t\t\tmarkers.set( markerName, new ModelRange( currentPosition.clone() ) );\n\t\t// Otherwise is means that we have found end of the marker range.\n\t\t} else {\n\t\t\tmarkers.get( markerName ).end = currentPosition.clone();\n\t\t}\n\n\t\t// Remove marker element from DocumentFragment.\n\t\twriter.remove( markerElement );\n\t}\n\n\treturn markers;\n}\n\n// Creates model fragment according to given context and returns position in the bottom (the deepest) element.\nfunction createContextTree( contextDefinition, writer ) {\n\tlet position;\n\n\tfor ( const item of new SchemaContext( contextDefinition ) ) {\n\t\tconst attributes = {};\n\n\t\tfor ( const key of item.getAttributeKeys() ) {\n\t\t\tattributes[ key ] = item.getAttribute( key );\n\t\t}\n\n\t\tconst current = writer.createElement( item.name, attributes );\n\n\t\tif ( position ) {\n\t\t\twriter.append( current, position );\n\t\t}\n\n\t\tposition = ModelPosition._createAt( current, 0 );\n\t}\n\n\treturn position;\n}\n\n/**\n * A set of conversion utilities available as the third parameter of the\n * {@link module:engine/conversion/upcastdispatcher~UpcastDispatcher upcast dispatcher}'s events.\n *\n * @interface module:engine/conversion/upcastdispatcher~UpcastConversionApi\n */\n\n/**\n * Starts the conversion of a given item by firing an appropriate event.\n *\n * Every fired event is passed (as the first parameter) an object with the `modelRange` property. Every event may set and/or\n * modify that property. When all callbacks are done, the final value of the `modelRange` property is returned by this method.\n * The `modelRange` must be a {@link module:engine/model/range~Range model range} or `null` (as set by default).\n *\n * @method #convertItem\n * @fires module:engine/conversion/upcastdispatcher~UpcastDispatcher#event:element\n * @fires module:engine/conversion/upcastdispatcher~UpcastDispatcher#event:text\n * @fires module:engine/conversion/upcastdispatcher~UpcastDispatcher#event:documentFragment\n * @param {module:engine/view/item~Item} viewItem Item to convert.\n * @param {module:engine/model/position~Position} modelCursor The conversion position.\n * @returns {Object} result The conversion result.\n * @returns {module:engine/model/range~Range|null} result.modelRange The model range containing the result of the item conversion,\n * created and modified by callbacks attached to the fired event, or `null` if the conversion result was incorrect.\n * @returns {module:engine/model/position~Position} result.modelCursor The position where the conversion should be continued.\n */\n\n/**\n * Starts the conversion of all children of a given item by firing appropriate events for all the children.\n *\n * @method #convertChildren\n * @fires module:engine/conversion/upcastdispatcher~UpcastDispatcher#event:element\n * @fires module:engine/conversion/upcastdispatcher~UpcastDispatcher#event:text\n * @fires module:engine/conversion/upcastdispatcher~UpcastDispatcher#event:documentFragment\n * @param {module:engine/view/item~Item} viewItem An element whose children should be converted.\n * @param {module:engine/model/position~Position|module:engine/model/element~Element} positionOrElement A position or an element of\n * the conversion.\n * @returns {Object} result The conversion result.\n * @returns {module:engine/model/range~Range} result.modelRange The model range containing the results of the conversion of all children\n * of the given item. When no child was converted, the range is collapsed.\n * @returns {module:engine/model/position~Position} result.modelCursor The position where the conversion should be continued.\n */\n\n/**\n * Safely inserts an element to the document, checking the {@link module:engine/model/schema~Schema schema} to find an allowed parent for\n * an element that you are going to insert, starting from the given position. If the current parent does not allow to insert the element\n * but one of the ancestors does, then splits the nodes to allowed parent.\n *\n * If the schema allows to insert the node in a given position, nothing is split.\n *\n * If it was not possible to find an allowed parent, `false` is returned and nothing is split.\n *\n * Otherwise, ancestors are split.\n *\n * For instance, if `<image>` is not allowed in `<paragraph>` but is allowed in `$root`:\n *\n *\t\t<paragraph>foo[]bar</paragraph>\n *\n *\t\t-> safe insert for `<image>` will split ->\n *\n *\t\t<paragraph>foo</paragraph>[]<paragraph>bar</paragraph>\n *\n * Example usage:\n *\n *\t\tconst myElement = conversionApi.writer.createElement( 'myElement' );\n *\n *\t\tif ( !conversionApi.safeInsert( myElement, data.modelCursor ) ) {\n *\t\t\treturn;\n *\t\t}\n *\n * The split result is saved and {@link #updateConversionResult} should be used to update the\n * {@link module:engine/conversion/upcastdispatcher~UpcastConversionData conversion data}.\n *\n * @method #safeInsert\n * @param {module:engine/model/node~Node} node The node to insert.\n * @param {module:engine/model/position~Position} position The position where an element is going to be inserted.\n * @returns {Boolean} The split result. If it was not possible to find an allowed position, `false` is returned.\n */\n\n/**\n * Updates the conversion result and sets a proper {@link module:engine/conversion/upcastdispatcher~UpcastConversionData#modelRange} and\n * the next {@link module:engine/conversion/upcastdispatcher~UpcastConversionData#modelCursor} after the conversion.\n * Used together with {@link #safeInsert}, it enables you to easily convert elements without worrying if the node was split\n * during the conversion of its children.\n *\n * A usage example in converter code:\n *\n *\t\tconst myElement = conversionApi.writer.createElement( 'myElement' );\n *\n *\t\tif ( !conversionApi.safeInsert( myElement, data.modelCursor ) ) {\n *\t\t\treturn;\n *\t\t}\n *\n *\t\t// Children conversion may split `myElement`.\n *\t\tconversionApi.convertChildren( data.viewItem, myElement );\n *\n *\t\tconversionApi.updateConversionResult( myElement, data );\n *\n * @method #updateConversionResult\n * @param {module:engine/model/element~Element} element\n * @param {module:engine/conversion/upcastdispatcher~UpcastConversionData} data Conversion data.\n * @param {module:engine/conversion/upcastdispatcher~UpcastConversionApi} conversionApi Conversion utilities to be used by the callback.\n */\n\n/**\n * Checks the {@link module:engine/model/schema~Schema schema} to find an allowed parent for an element that is going to be inserted\n * starting from the given position. If the current parent does not allow inserting an element but one of the ancestors does, the method\n * splits nodes to allowed parent.\n *\n * If the schema allows inserting the node in the given position, nothing is split and an object with that position is returned.\n *\n * If it was not possible to find an allowed parent, `null` is returned and nothing is split.\n *\n * Otherwise, ancestors are split and an object with a position and the copy of the split element is returned.\n *\n * For instance, if `<image>` is not allowed in `<paragraph>` but is allowed in `$root`:\n *\n *\t\t<paragraph>foo[]bar</paragraph>\n *\n *\t\t-> split for `<image>` ->\n *\n *\t\t<paragraph>foo</paragraph>[]<paragraph>bar</paragraph>\n *\n * In the example above, the position between `<paragraph>` elements will be returned as `position` and the second `paragraph`\n * as `cursorParent`.\n *\n * **Note:** This is an advanced method. For most cases {@link #safeInsert} and {@link #updateConversionResult} should be used.\n *\n * @method #splitToAllowedParent\n * @param {module:engine/model/position~Position} position The position where the element is going to be inserted.\n * @param {module:engine/model/node~Node} node The node to insert.\n * @returns {Object|null} The split result. If it was not possible to find an allowed position, `null` is returned.\n * @returns {module:engine/model/position~Position} The position between split elements.\n * @returns {module:engine/model/element~Element} [cursorParent] The element inside which the cursor should be placed to\n * continue the conversion. When the element is not defined it means that there was no split.\n */\n\n/**\n * Returns all the split parts of the given `element` that were created during upcasting through using {@link #splitToAllowedParent}.\n * It enables you to easily track these elements and continue processing them after they are split during the conversion of their children.\n *\n *\t\t<paragraph>Foo<image />bar<image />baz</paragraph> ->\n *\t\t<paragraph>Foo</paragraph><image /><paragraph>bar</paragraph><image /><paragraph>baz</paragraph>\n *\n * For a reference to any of above paragraphs, the function will return all three paragraphs (the original element included),\n * sorted in the order of their creation (the original element is the first one).\n *\n * If the given `element` was not split, an array with a single element is returned.\n *\n * A usage example in the converter code:\n *\n *\t\tconst myElement = conversionApi.writer.createElement( 'myElement' );\n *\n *\t\t// Children conversion may split `myElement`.\n *\t\tconversionApi.convertChildren( data.viewItem, data.modelCursor );\n *\n *\t\tconst splitParts = conversionApi.getSplitParts( myElement );\n *\t\tconst lastSplitPart = splitParts[ splitParts.length - 1 ];\n *\n *\t\t// Setting `data.modelRange` basing on split parts:\n *\t\tdata.modelRange = conversionApi.writer.createRange(\n *\t\t\tconversionApi.writer.createPositionBefore( myElement ),\n *\t\t\tconversionApi.writer.createPositionAfter( lastSplitPart )\n *\t\t);\n *\n *\t\t// Setting `data.modelCursor` to continue after the last split element:\n *\t\tdata.modelCursor = conversionApi.writer.createPositionAfter( lastSplitPart );\n *\n * **Tip:** If you are unable to get a reference to the original element (for example because the code is split into multiple converters\n * or even classes) but it has already been converted, you may want to check the first element in `data.modelRange`. This is a common\n * situation if an attribute converter is separated from an element converter.\n *\n * **Note:** This is an advanced method. For most cases {@link #safeInsert} and {@link #updateConversionResult} should be used.\n *\n * @method #getSplitParts\n * @param {module:engine/model/element~Element} element\n * @returns {Array.<module:engine/model/element~Element>}\n */\n\n/**\n * Stores information about what parts of the processed view item are still waiting to be handled. After a piece of view item\n * was converted, an appropriate consumable value should be\n * {@link module:engine/conversion/viewconsumable~ViewConsumable#consume consumed}.\n *\n * @member {module:engine/conversion/viewconsumable~ViewConsumable} #consumable\n */\n\n/**\n * Custom data stored by converters for the conversion process. Custom properties of this object can be defined and use to\n * pass parameters between converters.\n *\n * The difference between this property and the `data` parameter of\n * {@link module:engine/conversion/upcastdispatcher~UpcastDispatcher#event:element} is that the `data` parameters allow you\n * to pass parameters within a single event and `store` within the whole conversion.\n *\n * @member {Object} #store\n */\n\n/**\n * The model's schema instance.\n *\n * @member {module:engine/model/schema~Schema} #schema\n */\n\n/**\n * The {@link module:engine/model/writer~Writer} instance used to manipulate the data during conversion.\n *\n * @member {module:engine/model/writer~Writer} #writer\n */\n\n/**\n * Conversion data.\n *\n * **Note:** Keep in mind that this object is shared by reference between all conversion callbacks that will be called.\n * This means that callbacks can override values if needed, and these values will be available in other callbacks.\n *\n * @typedef {Object} module:engine/conversion/upcastdispatcher~UpcastConversionData\n *\n * @property {module:engine/view/item~Item} viewItem The converted item.\n * @property {module:engine/model/position~Position} modelCursor The position where the converter should start changes.\n * Change this value for the next converter to tell where the conversion should continue.\n * @property {module:engine/model/range~Range} [modelRange] The current state of conversion result. Every change to\n * the converted element should be reflected by setting or modifying this property.\n */\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module engine/controller/datacontroller\n */\n\nimport mix from '@ckeditor/ckeditor5-utils/src/mix';\nimport ObservableMixin from '@ckeditor/ckeditor5-utils/src/observablemixin';\nimport CKEditorError from '@ckeditor/ckeditor5-utils/src/ckeditorerror';\n\nimport Mapper from '../conversion/mapper';\n\nimport DowncastDispatcher from '../conversion/downcastdispatcher';\nimport { insertText } from '../conversion/downcasthelpers';\n\nimport UpcastDispatcher from '../conversion/upcastdispatcher';\nimport { convertText, convertToModelFragment } from '../conversion/upcasthelpers';\n\nimport ViewDocumentFragment from '../view/documentfragment';\nimport ViewDocument from '../view/document';\nimport ViewDowncastWriter from '../view/downcastwriter';\n\nimport ModelRange from '../model/range';\nimport { autoParagraphEmptyRoots } from '../model/utils/autoparagraphing';\n\n/**\n * Controller for the data pipeline. The data pipeline controls how data is retrieved from the document\n * and set inside it. Hence, the controller features two methods which allow to {@link ~DataController#get get}\n * and {@link ~DataController#set set} data of the {@link ~DataController#model model}\n * using given:\n *\n * * {@link module:engine/dataprocessor/dataprocessor~DataProcessor data processor},\n * * downcast converters,\n * * upcast converters.\n *\n * An instance of the data controller is always available in the {@link module:core/editor/editor~Editor#data `editor.data`}\n * property:\n *\n *\t\teditor.data.get( { rootName: 'customRoot' } ); // -> '<p>Hello!</p>'\n *\n * @mixes module:utils/observablemixin~ObservableMixin\n */\nexport default class DataController {\n\t/**\n\t * Creates a data controller instance.\n\t *\n\t * @param {module:engine/model/model~Model} model Data model.\n\t * @param {module:engine/view/stylesmap~StylesProcessor} stylesProcessor The styles processor instance.\n\t */\n\tconstructor( model, stylesProcessor ) {\n\t\t/**\n\t\t * Data model.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:engine/model/model~Model}\n\t\t */\n\t\tthis.model = model;\n\n\t\t/**\n\t\t * Styles processor used during the conversion.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:engine/view/stylesmap~StylesProcessor}\n\t\t */\n\t\tthis.stylesProcessor = stylesProcessor;\n\n\t\t/**\n\t\t * Data processor used during the conversion.\n\t\t *\n\t\t * @member {module:engine/dataprocessor/dataprocessor~DataProcessor} #processor\n\t\t */\n\t\tthis.processor = undefined;\n\n\t\t/**\n\t\t * Mapper used for the conversion. It has no permanent bindings, because they are created when getting data and\n\t\t * cleared directly after the data are converted. However, the mapper is defined as a class property, because\n\t\t * it needs to be passed to the `DowncastDispatcher` as a conversion API.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:engine/conversion/mapper~Mapper}\n\t\t */\n\t\tthis.mapper = new Mapper();\n\n\t\t/**\n\t\t * Downcast dispatcher used by the {@link #get get method}. Downcast converters should be attached to it.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:engine/conversion/downcastdispatcher~DowncastDispatcher}\n\t\t */\n\t\tthis.downcastDispatcher = new DowncastDispatcher( {\n\t\t\tmapper: this.mapper,\n\t\t\tschema: model.schema\n\t\t} );\n\t\tthis.downcastDispatcher.on( 'insert:$text', insertText(), { priority: 'lowest' } );\n\n\t\t/**\n\t\t * Upcast dispatcher used by the {@link #set set method}. Upcast converters should be attached to it.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:engine/conversion/upcastdispatcher~UpcastDispatcher}\n\t\t */\n\t\tthis.upcastDispatcher = new UpcastDispatcher( {\n\t\t\tschema: model.schema\n\t\t} );\n\n\t\t/**\n\t\t * The view document used by the data controller.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:engine/view/document~Document}\n\t\t */\n\t\tthis.viewDocument = new ViewDocument( stylesProcessor );\n\n\t\t/**\n\t\t * The view downcast writer just for data conversion purposes, i.e. to modify\n\t\t * the {@link #viewDocument}.\n\t\t *\n\t\t * @private\n\t\t * @readonly\n\t\t * @member {module:engine/view/downcastwriter~DowncastWriter}\n\t\t */\n\t\tthis._viewWriter = new ViewDowncastWriter( this.viewDocument );\n\n\t\t// Define default converters for text and elements.\n\t\t//\n\t\t// Note that if there is no default converter for the element it will be skipped, for instance `<b>foo</b>` will be\n\t\t// converted to nothing. We therefore add `convertToModelFragment` as a last converter so it converts children of that\n\t\t// element to the document fragment and so `<b>foo</b>` will be converted to `foo` if there is no converter for `<b>`.\n\t\tthis.upcastDispatcher.on( 'text', convertText(), { priority: 'lowest' } );\n\t\tthis.upcastDispatcher.on( 'element', convertToModelFragment(), { priority: 'lowest' } );\n\t\tthis.upcastDispatcher.on( 'documentFragment', convertToModelFragment(), { priority: 'lowest' } );\n\n\t\tthis.decorate( 'init' );\n\t\tthis.decorate( 'set' );\n\n\t\t// Fire the `ready` event when the initialization has completed. Such low-level listener gives possibility\n\t\t// to plug into the initialization pipeline without interrupting the initialization flow.\n\t\tthis.on( 'init', () => {\n\t\t\tthis.fire( 'ready' );\n\t\t}, { priority: 'lowest' } );\n\n\t\t// Fix empty roots after DataController is 'ready' (note that init method could be decorated and stopped).\n\t\t// We need to handle this event because initial data could be empty and post-fixer would not get triggered.\n\t\tthis.on( 'ready', () => {\n\t\t\tthis.model.enqueueChange( 'transparent', autoParagraphEmptyRoots );\n\t\t}, { priority: 'lowest' } );\n\t}\n\n\t/**\n\t * Returns the model's data converted by downcast dispatchers attached to {@link #downcastDispatcher} and\n\t * formatted by the {@link #processor data processor}.\n\t *\n\t * @param {Object} [options] Additional configuration for the retrieved data. `DataController` provides two optional\n\t * properties: `rootName` and `trim`. Other properties of this object are specified by various editor features.\n\t * @param {String} [options.rootName='main'] Root name.\n\t * @param {String} [options.trim='empty'] Whether returned data should be trimmed. This option is set to `empty` by default,\n\t * which means whenever editor content is considered empty, an empty string will be returned. To turn off trimming completely\n\t * use `'none'`. In such cases exact content will be returned (for example `<p>&nbsp;</p>` for an empty editor).\n\t * @returns {String} Output data.\n\t */\n\tget( options = {} ) {\n\t\tconst { rootName = 'main', trim = 'empty' } = options;\n\n\t\tif ( !this._checkIfRootsExists( [ rootName ] ) ) {\n\t\t\t/**\n\t\t\t * Cannot get data from a non-existing root. This error is thrown when {@link #get DataController#get() method}\n\t\t\t * is called with non-existent root name. For example, if there is an editor instance with only `main` root,\n\t\t\t * calling {@link #get} like:\n\t\t\t *\n\t\t\t *\t\tdata.get( { rootName: 'root2' } );\n\t\t\t *\n\t\t\t * will throw this error.\n\t\t\t *\n\t\t\t * @error datacontroller-get-non-existent-root\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'datacontroller-get-non-existent-root', this );\n\t\t}\n\n\t\tconst root = this.model.document.getRoot( rootName );\n\n\t\tif ( trim === 'empty' && !this.model.hasContent( root, { ignoreWhitespaces: true } ) ) {\n\t\t\treturn '';\n\t\t}\n\n\t\treturn this.stringify( root, options );\n\t}\n\n\t/**\n\t * Returns the content of the given {@link module:engine/model/element~Element model's element} or\n\t * {@link module:engine/model/documentfragment~DocumentFragment model document fragment} converted by the downcast converters\n\t * attached to {@link #downcastDispatcher} and formatted by the {@link #processor data processor}.\n\t *\n\t * @param {module:engine/model/element~Element|module:engine/model/documentfragment~DocumentFragment} modelElementOrFragment\n\t * Element whose content will be stringified.\n\t * @param {Object} [options] Additional configuration passed to the conversion process.\n\t * @returns {String} Output data.\n\t */\n\tstringify( modelElementOrFragment, options ) {\n\t\t// Model -> view.\n\t\tconst viewDocumentFragment = this.toView( modelElementOrFragment, options );\n\n\t\t// View -> data.\n\t\treturn this.processor.toData( viewDocumentFragment );\n\t}\n\n\t/**\n\t * Returns the content of the given {@link module:engine/model/element~Element model element} or\n\t * {@link module:engine/model/documentfragment~DocumentFragment model document fragment} converted by the downcast\n\t * converters attached to {@link #downcastDispatcher} to a\n\t * {@link module:engine/view/documentfragment~DocumentFragment view document fragment}.\n\t *\n\t * @param {module:engine/model/element~Element|module:engine/model/documentfragment~DocumentFragment} modelElementOrFragment\n\t * Element or document fragment whose content will be converted.\n\t * @param {Object} [options] Additional configuration that will be available through\n\t * {@link module:engine/conversion/downcastdispatcher~DowncastConversionApi#options} during the conversion process.\n\t * @returns {module:engine/view/documentfragment~DocumentFragment} Output view DocumentFragment.\n\t */\n\ttoView( modelElementOrFragment, options ) {\n\t\tconst viewDocument = this.viewDocument;\n\t\tconst viewWriter = this._viewWriter;\n\n\t\t// Clear bindings so the call to this method gives correct results.\n\t\tthis.mapper.clearBindings();\n\n\t\t// First, convert elements.\n\t\tconst modelRange = ModelRange._createIn( modelElementOrFragment );\n\t\tconst viewDocumentFragment = new ViewDocumentFragment( viewDocument );\n\n\t\tthis.mapper.bindElements( modelElementOrFragment, viewDocumentFragment );\n\n\t\t// Make additional options available during conversion process through `conversionApi`.\n\t\tthis.downcastDispatcher.conversionApi.options = options;\n\n\t\t// We have no view controller and rendering to DOM in DataController so view.change() block is not used here.\n\t\tthis.downcastDispatcher.convertInsert( modelRange, viewWriter );\n\n\t\tif ( !modelElementOrFragment.is( 'documentFragment' ) ) {\n\t\t\t// Then, if a document element is converted, convert markers.\n\t\t\t// From all document markers, get those, which \"intersect\" with the converter element.\n\t\t\tconst markers = _getMarkersRelativeToElement( modelElementOrFragment );\n\n\t\t\tfor ( const [ name, range ] of markers ) {\n\t\t\t\tthis.downcastDispatcher.convertMarkerAdd( name, range, viewWriter );\n\t\t\t}\n\t\t}\n\n\t\t// Clean `conversionApi`.\n\t\tdelete this.downcastDispatcher.conversionApi.options;\n\n\t\treturn viewDocumentFragment;\n\t}\n\n\t/**\n\t * Sets initial input data parsed by the {@link #processor data processor} and\n\t * converted by the {@link #upcastDispatcher view-to-model converters}.\n\t * Initial data can be set only to document that {@link module:engine/model/document~Document#version} is equal 0.\n\t *\n\t * **Note** This method is {@link module:utils/observablemixin~ObservableMixin#decorate decorated} which is\n\t * used by e.g. collaborative editing plugin that syncs remote data on init.\n\t *\n\t * When data is passed as a string it is initialized on a default `main` root:\n\t *\n\t *\t\tdataController.init( '<p>Foo</p>' ); // Initializes data on the `main` root.\n\t *\n\t * To initialize data on a different root or multiple roots at once, object containing `rootName` - `data` pairs should be passed:\n\t *\n\t *\t\tdataController.init( { main: '<p>Foo</p>', title: '<h1>Bar</h1>' } ); // Initializes data on the `main` and `title` roots.\n\t *\n\t * @fires init\n\t * @param {String|Object.<String,String>} data Input data as a string or an object containing `rootName` - `data`\n\t * pairs to initialize data on multiple roots at once.\n\t * @returns {Promise} Promise that is resolved after the data is set on the editor.\n\t */\n\tinit( data ) {\n\t\tif ( this.model.document.version ) {\n\t\t\t/**\n\t\t\t * Cannot set initial data to not empty {@link module:engine/model/document~Document}.\n\t\t\t * Initial data should be set once, during {@link module:core/editor/editor~Editor} initialization,\n\t\t\t * when the {@link module:engine/model/document~Document#version} is equal 0.\n\t\t\t *\n\t\t\t * @error datacontroller-init-document-not-empty\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'datacontroller-init-document-not-empty', this );\n\t\t}\n\n\t\tlet initialData = {};\n\t\tif ( typeof data === 'string' ) {\n\t\t\tinitialData.main = data; // Default root is 'main'. To initiate data on a different root, object should be passed.\n\t\t} else {\n\t\t\tinitialData = data;\n\t\t}\n\n\t\tif ( !this._checkIfRootsExists( Object.keys( initialData ) ) ) {\n\t\t\t/**\n\t\t\t * Cannot init data on a non-existing root. This error is thrown when {@link #init DataController#init() method}\n\t\t\t * is called with non-existent root name. For example, if there is an editor instance with only `main` root,\n\t\t\t * calling {@link #init} like:\n\t\t\t *\n\t\t\t * \t\tdata.init( { main: '<p>Foo</p>', root2: '<p>Bar</p>' } );\n\t\t\t *\n\t\t\t * will throw this error.\n\t\t\t *\n\t\t\t * @error datacontroller-init-non-existent-root\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'datacontroller-init-non-existent-root', this );\n\t\t}\n\n\t\tthis.model.enqueueChange( 'transparent', writer => {\n\t\t\tfor ( const rootName of Object.keys( initialData ) ) {\n\t\t\t\tconst modelRoot = this.model.document.getRoot( rootName );\n\t\t\t\twriter.insert( this.parse( initialData[ rootName ], modelRoot ), modelRoot, 0 );\n\t\t\t}\n\t\t} );\n\n\t\treturn Promise.resolve();\n\t}\n\n\t/**\n\t * Sets input data parsed by the {@link #processor data processor} and\n\t * converted by the {@link #upcastDispatcher view-to-model converters}.\n\t * This method can be used any time to replace existing editor data by the new one without clearing the\n\t * {@link module:engine/model/document~Document#history document history}.\n\t *\n\t * This method also creates a batch with all the changes applied. If all you need is to parse data, use\n\t * the {@link #parse} method.\n\t *\n\t * When data is passed as a string it is set on a default `main` root:\n\t *\n\t *\t\tdataController.set( '<p>Foo</p>' ); // Sets data on the `main` root.\n\t *\n\t * To set data on a different root or multiple roots at once, object containing `rootName` - `data` pairs should be passed:\n\t *\n\t *\t\tdataController.set( { main: '<p>Foo</p>', title: '<h1>Bar</h1>' } ); // Sets data on the `main` and `title` roots.\n\t *\n\t * @fires set\n\t * @param {String|Object.<String,String>} data Input data as a string or an object containing `rootName` - `data`\n\t * pairs to set data on multiple roots at once.\n\t */\n\tset( data ) {\n\t\tlet newData = {};\n\n\t\tif ( typeof data === 'string' ) {\n\t\t\tnewData.main = data; // Default root is 'main'. To set data on a different root, object should be passed.\n\t\t} else {\n\t\t\tnewData = data;\n\t\t}\n\n\t\tif ( !this._checkIfRootsExists( Object.keys( newData ) ) ) {\n\t\t\t/**\n\t\t\t * Cannot set data on a non-existing root. This error is thrown when {@link #set DataController#set() method}\n\t\t\t * is called with non-existent root name. For example, if there is an editor instance with only `main` root,\n\t\t\t * calling {@link #set} like:\n\t\t\t *\n\t\t\t * \t\tdata.set( { main: '<p>Foo</p>', root2: '<p>Bar</p>' } );\n\t\t\t *\n\t\t\t * will throw this error.\n\t\t\t *\n\t\t\t * @error datacontroller-set-non-existent-root\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'datacontroller-set-non-existent-root', this );\n\t\t}\n\n\t\tthis.model.enqueueChange( 'transparent', writer => {\n\t\t\twriter.setSelection( null );\n\t\t\twriter.removeSelectionAttribute( this.model.document.selection.getAttributeKeys() );\n\n\t\t\tfor ( const rootName of Object.keys( newData ) ) {\n\t\t\t\t// Save to model.\n\t\t\t\tconst modelRoot = this.model.document.getRoot( rootName );\n\n\t\t\t\twriter.remove( writer.createRangeIn( modelRoot ) );\n\t\t\t\twriter.insert( this.parse( newData[ rootName ], modelRoot ), modelRoot, 0 );\n\t\t\t}\n\t\t} );\n\t}\n\n\t/**\n\t * Returns the data parsed by the {@link #processor data processor} and then converted by upcast converters\n\t * attached to the {@link #upcastDispatcher}.\n\t *\n\t * @see #set\n\t * @param {String} data Data to parse.\n\t * @param {module:engine/model/schema~SchemaContextDefinition} [context='$root'] Base context in which the view will\n\t * be converted to the model. See: {@link module:engine/conversion/upcastdispatcher~UpcastDispatcher#convert}.\n\t * @returns {module:engine/model/documentfragment~DocumentFragment} Parsed data.\n\t */\n\tparse( data, context = '$root' ) {\n\t\t// data -> view\n\t\tconst viewDocumentFragment = this.processor.toView( data );\n\n\t\t// view -> model\n\t\treturn this.toModel( viewDocumentFragment, context );\n\t}\n\n\t/**\n\t * Returns the result of the given {@link module:engine/view/element~Element view element} or\n\t * {@link module:engine/view/documentfragment~DocumentFragment view document fragment} converted by the\n\t * {@link #upcastDispatcher view-to-model converters}, wrapped by {@link module:engine/model/documentfragment~DocumentFragment}.\n\t *\n\t * When marker elements were converted during the conversion process, it will be set as a document fragment's\n\t * {@link module:engine/model/documentfragment~DocumentFragment#markers static markers map}.\n\t *\n\t * @param {module:engine/view/element~Element|module:engine/view/documentfragment~DocumentFragment} viewElementOrFragment\n\t * Element or document fragment whose content will be converted.\n\t * @param {module:engine/model/schema~SchemaContextDefinition} [context='$root'] Base context in which the view will\n\t * be converted to the model. See: {@link module:engine/conversion/upcastdispatcher~UpcastDispatcher#convert}.\n\t * @returns {module:engine/model/documentfragment~DocumentFragment} Output document fragment.\n\t */\n\ttoModel( viewElementOrFragment, context = '$root' ) {\n\t\treturn this.model.change( writer => {\n\t\t\treturn this.upcastDispatcher.convert( viewElementOrFragment, writer, context );\n\t\t} );\n\t}\n\n\t/**\n\t * Adds a style processor normalization rules.\n\t *\n\t * You can implement your own rules as well as use one of the available processor rules:\n\t *\n\t * * background: {@link module:engine/view/styles/background~addBackgroundRules}\n\t * * border: {@link module:engine/view/styles/border~addBorderRules}\n\t * * margin: {@link module:engine/view/styles/margin~addMarginRules}\n\t * * padding: {@link module:engine/view/styles/padding~addPaddingRules}\n\t *\n\t * @param {Function} callback\n\t */\n\taddStyleProcessorRules( callback ) {\n\t\tcallback( this.stylesProcessor );\n\t}\n\n\t/**\n\t * Removes all event listeners set by the DataController.\n\t */\n\tdestroy() {\n\t\tthis.stopListening();\n\t}\n\n\t/**\n\t * Checks if all provided root names are existing editor roots.\n\t *\n\t * @private\n\t * @param {Array.<String>} rootNames Root names to check.\n\t * @returns {Boolean} Whether all provided root names are existing editor roots.\n\t */\n\t_checkIfRootsExists( rootNames ) {\n\t\tfor ( const rootName of rootNames ) {\n\t\t\tif ( !this.model.document.getRootNames().includes( rootName ) ) {\n\t\t\t\treturn false;\n\t\t\t}\n\t\t}\n\n\t\treturn true;\n\t}\n\n\t/**\n\t * Event fired once the data initialization has finished.\n\t *\n\t * @event ready\n\t */\n\n\t/**\n\t * Event fired after the {@link #init `init()` method} was run. It can be {@link #listenTo listened to} in order to adjust or modify\n\t * the initialization flow. However, if the `init` event is stopped or prevented, the {@link #event:ready `ready` event}\n\t * should be fired manually.\n\t *\n\t * The `init` event is fired by the decorated {@link #init} method.\n\t * See {@link module:utils/observablemixin~ObservableMixin#decorate} for more information and samples.\n\t *\n\t * @event init\n\t */\n\n\t/**\n\t * Event fired after {@link #set set() method} has been run.\n\t *\n\t * The `set` event is fired by decorated {@link #set} method.\n\t * See {@link module:utils/observablemixin~ObservableMixin#decorate} for more information and samples.\n\t *\n\t * @event set\n\t */\n}\n\nmix( DataController, ObservableMixin );\n\n// Helper function for downcast conversion.\n//\n// Takes a document element (element that is added to a model document) and checks which markers are inside it\n// and which markers are containing it. If the marker is intersecting with element, the intersection is returned.\nfunction _getMarkersRelativeToElement( element ) {\n\tconst result = [];\n\tconst doc = element.root.document;\n\n\tif ( !doc ) {\n\t\treturn [];\n\t}\n\n\tconst elementRange = ModelRange._createIn( element );\n\n\tfor ( const marker of doc.model.markers ) {\n\t\tconst intersection = elementRange.getIntersection( marker.getRange() );\n\n\t\tif ( intersection ) {\n\t\t\tresult.push( [ marker.name, intersection ] );\n\t\t}\n\t}\n\n\treturn result;\n}\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module engine/conversion/conversion\n */\n\nimport CKEditorError from '@ckeditor/ckeditor5-utils/src/ckeditorerror';\nimport UpcastHelpers from './upcasthelpers';\nimport DowncastHelpers from './downcasthelpers';\nimport toArray from '@ckeditor/ckeditor5-utils/src/toarray';\n\n/**\n * A utility class that helps add converters to upcast and downcast dispatchers.\n *\n * We recommend reading the {@glink framework/guides/architecture/editing-engine Editing engine architecture} guide first to\n * understand the core concepts of the conversion mechanisms.\n *\n * An instance of the conversion manager is available in the\n * {@link module:core/editor/editor~Editor#conversion `editor.conversion`} property\n * and by default has the following groups of dispatchers (i.e. directions of conversion):\n *\n * * `downcast` (editing and data downcasts)\n * * `editingDowncast`\n * * `dataDowncast`\n * * `upcast`\n *\n * # One-way converters\n *\n * To add a converter to a specific group, use the {@link module:engine/conversion/conversion~Conversion#for `for()`}\n * method:\n *\n *\t\t// Add a converter to editing downcast and data downcast.\n *\t\teditor.conversion.for( 'downcast' ).elementToElement( config ) );\n *\n *\t\t// Add a converter to the data pipepline only:\n *\t\teditor.conversion.for( 'dataDowncast' ).elementToElement( dataConversionConfig ) );\n *\n *\t\t// And a slightly different one for the editing pipeline:\n *\t\teditor.conversion.for( 'editingDowncast' ).elementToElement( editingConversionConfig ) );\n *\n * See {@link module:engine/conversion/conversion~Conversion#for `for()`} method documentation to learn more about\n * available conversion helpers and how to use your custom ones.\n *\n * # Two-way converters\n *\n * Besides using one-way converters via the `for()` method, you can also use other methods available in this\n * class to add two-way converters (upcast and downcast):\n *\n * * {@link module:engine/conversion/conversion~Conversion#elementToElement `elementToElement()`} &ndash;\n * Model element to view element and vice versa.\n * * {@link module:engine/conversion/conversion~Conversion#attributeToElement `attributeToElement()`} &ndash;\n * Model attribute to view element and vice versa.\n * * {@link module:engine/conversion/conversion~Conversion#attributeToAttribute `attributeToAttribute()`} &ndash;\n * Model attribute to view element and vice versa.\n */\nexport default class Conversion {\n\t/**\n\t * Creates a new conversion instance.\n\t *\n\t * @param {module:engine/conversion/downcastdispatcher~DowncastDispatcher|\n\t * Array.<module:engine/conversion/downcastdispatcher~DowncastDispatcher>} downcastDispatchers\n\t * @param {module:engine/conversion/upcastdispatcher~UpcastDispatcher|\n\t * Array.<module:engine/conversion/upcastdispatcher~UpcastDispatcher>} upcastDispatchers\n\t */\n\tconstructor( downcastDispatchers, upcastDispatchers ) {\n\t\t/**\n\t\t * Maps dispatchers group name to ConversionHelpers instances.\n\t\t *\n\t\t * @private\n\t\t * @member {Map.<String,module:engine/conversion/conversionhelpers~ConversionHelpers>}\n\t\t */\n\t\tthis._helpers = new Map();\n\n\t\t// Define default 'downcast' & 'upcast' dispatchers groups. Those groups are always available as two-way converters needs them.\n\t\tthis._downcast = toArray( downcastDispatchers );\n\t\tthis._createConversionHelpers( { name: 'downcast', dispatchers: this._downcast, isDowncast: true } );\n\n\t\tthis._upcast = toArray( upcastDispatchers );\n\t\tthis._createConversionHelpers( { name: 'upcast', dispatchers: this._upcast, isDowncast: false } );\n\t}\n\n\t/**\n\t * Define an alias for registered dispatcher.\n\t *\n\t *\t\tconst conversion = new Conversion(\n\t *\t\t\t[ dataDowncastDispatcher, editingDowncastDispatcher ],\n\t *\t\t\tupcastDispatcher\n\t *\t\t);\n\t *\n\t *\t\tconversion.addAlias( 'dataDowncast', dataDowncastDispatcher );\n\t *\n\t * @param {String} alias An alias of a dispatcher.\n\t * @param {module:engine/conversion/downcastdispatcher~DowncastDispatcher|\n\t * module:engine/conversion/upcastdispatcher~UpcastDispatcher} dispatcher Dispatcher which should have an alias.\n\t */\n\taddAlias( alias, dispatcher ) {\n\t\tconst isDowncast = this._downcast.includes( dispatcher );\n\t\tconst isUpcast = this._upcast.includes( dispatcher );\n\n\t\tif ( !isUpcast && !isDowncast ) {\n\t\t\t/**\n\t\t\t * Trying to register and alias for a dispatcher that nas not been registered.\n\t\t\t *\n\t\t\t * @error conversion-add-alias-dispatcher-not-registered\n\t\t\t */\n\t\t\tthrow new CKEditorError(\n\t\t\t\t'conversion-add-alias-dispatcher-not-registered',\n\t\t\t\tthis\n\t\t\t);\n\t\t}\n\n\t\tthis._createConversionHelpers( { name: alias, dispatchers: [ dispatcher ], isDowncast } );\n\t}\n\n\t/**\n\t * Provides a chainable API to assign converters to conversion dispatchers group.\n\t *\n\t * If the given group name has not been registered, the\n\t * {@link module:utils/ckeditorerror~CKEditorError `conversion-for-unknown-group` error} is thrown.\n\t *\n\t * You can use conversion helpers available directly in the `for()` chain or your custom ones via\n\t * the {@link module:engine/conversion/conversionhelpers~ConversionHelpers#add `add()`} method.\n\t *\n\t * # Using bulit-in conversion helpers\n\t *\n\t * The `for()` chain comes with a set of conversion helpers which you can use like this:\n\t *\n\t *\t\teditor.conversion.for( 'downcast' )\n\t *\t\t\t.elementToElement( config1 )        // Adds an element-to-element downcast converter.\n\t *\t\t\t.attributeToElement( config2 );     // Adds an attribute-to-element downcast converter.\n\t *\n\t *\t\teditor.conversion.for( 'upcast' )\n\t *\t\t\t.elementToAttribute( config3 );     // Adds an element-to-attribute upcast converter.\n\t *\n\t * Refer to the documentation of built-in conversion helpers to learn about their configuration options.\n\t *\n\t * * downcast (model-to-view) conversion helpers:\n\t *\n\t *\t* {@link module:engine/conversion/downcasthelpers~DowncastHelpers#elementToElement `elementToElement()`},\n\t *\t* {@link module:engine/conversion/downcasthelpers~DowncastHelpers#attributeToElement `attributeToElement()`},\n\t *\t* {@link module:engine/conversion/downcasthelpers~DowncastHelpers#attributeToAttribute `attributeToAttribute()`}.\n\t *\t* {@link module:engine/conversion/downcasthelpers~DowncastHelpers#markerToElement `markerToElement()`}.\n\t *\t* {@link module:engine/conversion/downcasthelpers~DowncastHelpers#markerToHighlight `markerToHighlight()`}.\n\t *\n\t * * upcast (view-to-model) conversion helpers:\n\t *\n\t *\t* {@link module:engine/conversion/upcasthelpers~UpcastHelpers#elementToElement `elementToElement()`},\n\t *\t* {@link module:engine/conversion/upcasthelpers~UpcastHelpers#elementToAttribute `elementToAttribute()`},\n\t *\t* {@link module:engine/conversion/upcasthelpers~UpcastHelpers#attributeToAttribute `attributeToAttribute()`}.\n\t *\t* {@link module:engine/conversion/upcasthelpers~UpcastHelpers#elementToMarker `elementToMarker()`}.\n\t *\n\t * # Using custom conversion helpers\n\t *\n\t * If you need to implement a nontypical converter, you can do so by calling:\n\t *\n\t *\t\teditor.conversion.for( direction ).add( customHelper );\n\t *\n\t * The `.add()` method takes exactly one parameter, which is a function. This function should accept one parameter that\n\t * is a dispatcher instance. The function should add an actual converter to the passed dispatcher instance.\n\t *\n\t * Example:\n\t *\n\t *\t\teditor.conversion.for( 'upcast' ).add( dispatcher => {\n\t *\t\t\tdispatcher.on( 'element:a',  ( evt, data, conversionApi ) => {\n\t *\t\t\t\t// Do something with a view <a> element.\n\t *\t\t\t} );\n\t *\t\t} );\n\t *\n\t * Refer to the documentation of {@link module:engine/conversion/upcastdispatcher~UpcastDispatcher}\n\t * and {@link module:engine/conversion/downcastdispatcher~DowncastDispatcher} to learn how to write\n\t * custom converters.\n\t *\n\t * @param {String} groupName The name of dispatchers group to add the converters to.\n\t * @returns {module:engine/conversion/downcasthelpers~DowncastHelpers|module:engine/conversion/upcasthelpers~UpcastHelpers}\n\t */\n\tfor( groupName ) {\n\t\tif ( !this._helpers.has( groupName ) ) {\n\t\t\t/**\n\t\t\t * Trying to add a converter to an unknown dispatchers group.\n\t\t\t *\n\t\t\t * @error conversion-for-unknown-group\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'conversion-for-unknown-group', this );\n\t\t}\n\n\t\treturn this._helpers.get( groupName );\n\t}\n\n\t/**\n\t * Sets up converters between the model and the view that convert a model element to a view element (and vice versa).\n\t * For example, the model `<paragraph>Foo</paragraph>` is `<p>Foo</p>` in the view.\n\t *\n\t *\t\t// A simple conversion from the `paragraph` model element to the `<p>` view element (and vice versa).\n\t *\t\teditor.conversion.elementToElement( { model: 'paragraph', view: 'p' } );\n\t *\n\t *\t\t// Override other converters by specifying a converter definition with a higher priority.\n\t *\t\teditor.conversion.elementToElement( { model: 'paragraph', view: 'div', converterPriority: 'high' } );\n\t *\n\t *\t\t// View specified as an object instead of a string.\n\t *\t\teditor.conversion.elementToElement( {\n\t *\t\t\tmodel: 'fancyParagraph',\n\t *\t\t\tview: {\n\t *\t\t\t\tname: 'p',\n\t *\t\t\t\tclasses: 'fancy'\n\t *\t\t\t}\n\t *\t\t} );\n\t *\n\t *\t\t// Use `upcastAlso` to define other view elements that should also be converted to a `paragraph` element.\n\t *\t\teditor.conversion.elementToElement( {\n\t *\t\t\tmodel: 'paragraph',\n\t *\t\t\tview: 'p',\n\t *\t\t\tupcastAlso: [\n\t *\t\t\t\t'div',\n\t *\t\t\t\t{\n\t *\t\t\t\t\t// Any element with the `display: block` style.\n\t *\t\t\t\t\tstyles: {\n\t *\t\t\t\t\t\tdisplay: 'block'\n\t *\t\t\t\t\t}\n\t *\t\t\t\t}\n\t *\t\t\t]\n\t *\t\t} );\n\t *\n\t *\t\t// `upcastAlso` set as callback enables a conversion of a wide range of different view elements.\n\t *\t\teditor.conversion.elementToElement( {\n\t *\t\t\tmodel: 'heading',\n\t *\t\t\tview: 'h2',\n\t *\t\t\t// Convert \"headling-like\" paragraphs to headings.\n\t *\t\t\tupcastAlso: viewElement => {\n\t *\t\t\t\tconst fontSize = viewElement.getStyle( 'font-size' );\n\t *\n\t *\t\t\t\tif ( !fontSize ) {\n\t *\t\t\t\t\treturn null;\n\t *\t\t\t\t}\n\t *\n\t *\t\t\t\tconst match = fontSize.match( /(\\d+)\\s*px/ );\n\t *\n\t *\t\t\t\tif ( !match ) {\n\t *\t\t\t\t\treturn null;\n\t *\t\t\t\t}\n\t *\n\t *\t\t\t\tconst size = Number( match[ 1 ] );\n\t *\n\t *\t\t\t\tif ( size > 26 ) {\n\t *\t\t\t\t\t// Returned value can be an object with the matched properties.\n\t *\t\t\t\t\t// These properties will be \"consumed\" during the conversion.\n\t *\t\t\t\t\t// See `engine.view.Matcher~MatcherPattern` and `engine.view.Matcher#match` for more details.\n\t *\n\t *\t\t\t\t\treturn { name: true, styles: [ 'font-size' ] };\n\t *\t\t\t\t}\n\t *\n\t *\t\t\t\treturn null;\n\t *\t\t\t}\n\t *\t\t} );\n\t *\n\t * `definition.model` is a `String` with a model element name to convert from or to.\n\t * See {@link module:engine/conversion/conversion~ConverterDefinition} to learn about other parameters.\n\t *\n\t * @param {module:engine/conversion/conversion~ConverterDefinition} definition The converter definition.\n\t */\n\telementToElement( definition ) {\n\t\t// Set up downcast converter.\n\t\tthis.for( 'downcast' ).elementToElement( definition );\n\n\t\t// Set up upcast converter.\n\t\tfor ( const { model, view } of _getAllUpcastDefinitions( definition ) ) {\n\t\t\tthis.for( 'upcast' )\n\t\t\t\t.elementToElement( {\n\t\t\t\t\tmodel,\n\t\t\t\t\tview,\n\t\t\t\t\tconverterPriority: definition.converterPriority\n\t\t\t\t} );\n\t\t}\n\t}\n\n\t/**\n\t * Sets up converters between the model and the view that convert a model attribute to a view element (and vice versa).\n\t * For example, a model text node with `\"Foo\"` as data and the `bold` attribute is `<strong>Foo</strong>` in the view.\n\t *\n\t *\t\t// A simple conversion from the `bold=true` attribute to the `<strong>` view element (and vice versa).\n\t *\t\teditor.conversion.attributeToElement( { model: 'bold', view: 'strong' } );\n\t *\n\t *\t\t// Override other converters by specifying a converter definition with a higher priority.\n\t *\t\teditor.conversion.attributeToElement( { model: 'bold', view: 'b', converterPriority: 'high' } );\n\t *\n\t *\t\t// View specified as an object instead of a string.\n\t *\t\teditor.conversion.attributeToElement( {\n\t *\t\t\tmodel: 'bold',\n\t *\t\t\tview: {\n\t *\t\t\t\tname: 'span',\n\t *\t\t\t\tclasses: 'bold'\n\t *\t\t\t}\n\t *\t\t} );\n\t *\n\t *\t\t// Use `config.model.name` to define the conversion only from a given node type, `$text` in this case.\n\t *\t\t// The same attribute on different elements may then be handled by a different converter.\n\t *\t\teditor.conversion.attributeToElement( {\n\t *\t\t\tmodel: {\n\t *\t\t\t\tkey: 'textDecoration',\n\t *\t\t\t\tvalues: [ 'underline', 'lineThrough' ],\n\t *\t\t\t\tname: '$text'\n\t *\t\t\t},\n\t *\t\t\tview: {\n\t *\t\t\t\tunderline: {\n\t *\t\t\t\t\tname: 'span',\n\t *\t\t\t\t\tstyles: {\n\t *\t\t\t\t\t\t'text-decoration': 'underline'\n\t *\t\t\t\t\t}\n\t *\t\t\t\t},\n\t *\t\t\t\tlineThrough: {\n\t *\t\t\t\t\tname: 'span',\n\t *\t\t\t\t\tstyles: {\n\t *\t\t\t\t\t\t'text-decoration': 'line-through'\n\t *\t\t\t\t\t}\n\t *\t\t\t\t}\n\t *\t\t\t}\n\t *\t\t} );\n\t *\n\t *\t\t// Use `upcastAlso` to define other view elements that should also be converted to the `bold` attribute.\n\t *\t\teditor.conversion.attributeToElement( {\n\t *\t\t\tmodel: 'bold',\n\t *\t\t\tview: 'strong',\n\t *\t\t\tupcastAlso: [\n\t *\t\t\t\t'b',\n\t *\t\t\t\t{\n\t *\t\t\t\t\tname: 'span',\n\t *\t\t\t\t\tclasses: 'bold'\n\t *\t\t\t\t},\n\t *\t\t\t\t{\n\t *\t\t\t\t\tname: 'span',\n\t *\t\t\t\t\tstyles: {\n\t *\t\t\t\t\t\t'font-weight': 'bold'\n\t *\t\t\t\t\t}\n\t *\t\t\t\t},\n\t *\t\t\t\tviewElement => {\n\t *\t\t\t\t\tconst fontWeight = viewElement.getStyle( 'font-weight' );\n\t *\n\t *\t\t\t\t\tif ( viewElement.is( 'element', 'span' ) && fontWeight && /\\d+/.test() && Number( fontWeight ) > 500 ) {\n\t *\t\t\t\t\t\t// Returned value can be an object with the matched properties.\n\t *\t\t\t\t\t\t// These properties will be \"consumed\" during the conversion.\n\t *\t\t\t\t\t\t// See `engine.view.Matcher~MatcherPattern` and `engine.view.Matcher#match` for more details.\n\t *\n\t *\t\t\t\t\t\treturn {\n\t *\t\t\t\t\t\t\tname: true,\n\t *\t\t\t\t\t\t\tstyles: [ 'font-weight' ]\n\t *\t\t\t\t\t\t};\n\t *\t\t\t\t\t}\n\t *\t\t\t\t}\n\t *\t\t\t]\n\t *\t\t} );\n\t *\n\t *\t\t// Conversion from and to a model attribute key whose value is an enum (`fontSize=big|small`).\n\t *\t\t// `upcastAlso` set as callback enables a conversion of a wide range of different view elements.\n\t *\t\teditor.conversion.attributeToElement( {\n\t *\t\t\tmodel: {\n\t *\t\t\t\tkey: 'fontSize',\n\t *\t\t\t\tvalues: [ 'big', 'small' ]\n\t *\t\t\t},\n\t *\t\t\tview: {\n\t *\t\t\t\tbig: {\n\t *\t\t\t\t\tname: 'span',\n\t *\t\t\t\t\tstyles: {\n\t *\t\t\t\t\t\t'font-size': '1.2em'\n\t *\t\t\t\t\t}\n\t *\t\t\t\t},\n\t *\t\t\t\tsmall: {\n\t *\t\t\t\t\tname: 'span',\n\t *\t\t\t\t\tstyles: {\n\t *\t\t\t\t\t\t'font-size': '0.8em'\n\t *\t\t\t\t\t}\n\t *\t\t\t\t}\n\t *\t\t\t},\n\t *\t\t\tupcastAlso: {\n\t *\t\t\t\tbig: viewElement => {\n\t *\t\t\t\t\tconst fontSize = viewElement.getStyle( 'font-size' );\n\t *\n\t *\t\t\t\t\tif ( !fontSize ) {\n\t *\t\t\t\t\t\treturn null;\n\t *\t\t\t\t\t}\n\t *\n\t *\t\t\t\t\tconst match = fontSize.match( /(\\d+)\\s*px/ );\n\t *\n\t *\t\t\t\t\tif ( !match ) {\n\t *\t\t\t\t\t\treturn null;\n\t *\t\t\t\t\t}\n\t *\n\t *\t\t\t\t\tconst size = Number( match[ 1 ] );\n\t *\n\t *\t\t\t\t\tif ( viewElement.is( 'element', 'span' ) && size > 10 ) {\n\t *\t\t\t\t\t\t// Returned value can be an object with the matched properties.\n\t *\t\t\t\t\t\t// These properties will be \"consumed\" during the conversion.\n\t *\t\t\t\t\t\t// See `engine.view.Matcher~MatcherPattern` and `engine.view.Matcher#match` for more details.\n\t *\n\t *\t\t\t\t\t\treturn { name: true, styles: [ 'font-size' ] };\n\t *\t\t\t\t\t}\n\t *\n\t *\t\t\t\t\treturn null;\n\t *\t\t\t\t},\n\t *\t\t\t\tsmall: viewElement => {\n\t *\t\t\t\t\tconst fontSize = viewElement.getStyle( 'font-size' );\n\t *\n\t *\t\t\t\t\tif ( !fontSize ) {\n\t *\t\t\t\t\t\treturn null;\n\t *\t\t\t\t\t}\n\t *\n\t *\t\t\t\t\tconst match = fontSize.match( /(\\d+)\\s*px/ );\n\t *\n\t *\t\t\t\t\tif ( !match ) {\n\t *\t\t\t\t\t\treturn null;\n\t *\t\t\t\t\t}\n\t *\n\t *\t\t\t\t\tconst size = Number( match[ 1 ] );\n\t *\n\t *\t\t\t\t\tif ( viewElement.is( 'element', 'span' ) && size < 10 ) {\n\t *\t\t\t\t\t\t// Returned value can be an object with the matched properties.\n\t *\t\t\t\t\t\t// These properties will be \"consumed\" during the conversion.\n\t *\t\t\t\t\t\t// See `engine.view.Matcher~MatcherPattern` and `engine.view.Matcher#match` for more details.\n\t *\n\t *\t\t\t\t\t\treturn { name: true, styles: [ 'font-size' ] };\n\t *\t\t\t\t\t}\n\t *\n\t *\t\t\t\t\treturn null;\n\t *\t\t\t\t}\n\t *\t\t\t}\n\t *\t\t} );\n\t *\n\t * The `definition.model` parameter specifies which model attribute should be converted from or to. It can be a `{ key, value }` object\n\t * describing the attribute key and value to convert or a `String` specifying just the attribute key (then `value` is set to `true`).\n\t * See {@link module:engine/conversion/conversion~ConverterDefinition} to learn about other parameters.\n\t *\n\t * @param {module:engine/conversion/conversion~ConverterDefinition} definition The converter definition.\n\t */\n\tattributeToElement( definition ) {\n\t\t// Set up downcast converter.\n\t\tthis.for( 'downcast' ).attributeToElement( definition );\n\n\t\t// Set up upcast converter.\n\t\tfor ( const { model, view } of _getAllUpcastDefinitions( definition ) ) {\n\t\t\tthis.for( 'upcast' )\n\t\t\t\t.elementToAttribute( {\n\t\t\t\t\tview,\n\t\t\t\t\tmodel,\n\t\t\t\t\tconverterPriority: definition.converterPriority\n\t\t\t\t} );\n\t\t}\n\t}\n\n\t/**\n\t * Sets up converters between the model and the view that convert a model attribute to a view attribute (and vice versa).\n\t * For example, `<image src='foo.jpg'></image>` is converted to `<img src='foo.jpg'></img>` (the same attribute key and value).\n\t * This type of converters is intended to be used with {@link module:engine/model/element~Element model element} nodes.\n\t * To convert text attributes {@link module:engine/conversion/conversion~Conversion#attributeToElement `attributeToElement converter`}\n\t * should be set up.\n\t *\n\t *\t\t// A simple conversion from the `source` model attribute to the `src` view attribute (and vice versa).\n\t *\t\teditor.conversion.attributeToAttribute( { model: 'source', view: 'src' } );\n\t *\n\t *\t\t// Attribute values are strictly specified.\n\t *\t\teditor.conversion.attributeToAttribute( {\n\t *\t\t\tmodel: {\n\t *\t\t\t\tname: 'image',\n\t *\t\t\t\tkey: 'aside',\n\t *\t\t\t\tvalues: [ 'aside' ]\n\t *\t\t\t},\n\t *\t\t\tview: {\n\t *\t\t\t\taside: {\n\t *\t\t\t\t\tname: 'img',\n\t *\t\t\t\t\tkey: 'class',\n\t *\t\t\t\t\tvalue: [ 'aside', 'half-size' ]\n\t *\t\t\t\t}\n\t *\t\t\t}\n\t *\t\t} );\n\t *\n\t *\t\t// Set the style attribute.\n\t *\t\teditor.conversion.attributeToAttribute( {\n\t *\t\t\tmodel: {\n\t *\t\t\t\tname: 'image',\n\t *\t\t\t\tkey: 'aside',\n\t *\t\t\t\tvalues: [ 'aside' ]\n\t *\t\t\t},\n\t *\t\t\tview: {\n\t *\t\t\t\taside: {\n\t *\t\t\t\t\tname: 'img',\n\t *\t\t\t\t\tkey: 'style',\n\t *\t\t\t\t\tvalue: {\n\t *\t\t\t\t\t\tfloat: 'right',\n\t *\t\t\t\t\t\twidth: '50%',\n\t *\t\t\t\t\t\tmargin: '5px'\n\t *\t\t\t\t\t}\n\t *\t\t\t\t}\n\t *\t\t\t}\n\t *\t\t} );\n\t *\n\t *\t\t// Conversion from and to a model attribute key whose value is an enum (`align=right|center`).\n\t *\t\t// Use `upcastAlso` to define other view elements that should also be converted to the `align=right` attribute.\n\t *\t\teditor.conversion.attributeToAttribute( {\n\t *\t\t\tmodel: {\n\t *\t\t\t\tkey: 'align',\n\t *\t\t\t\tvalues: [ 'right', 'center' ]\n\t *\t\t\t},\n\t *\t\t\tview: {\n\t *\t\t\t\tright: {\n\t *\t\t\t\t\tkey: 'class',\n\t *\t\t\t\t\tvalue: 'align-right'\n\t *\t\t\t\t},\n\t *\t\t\t\tcenter: {\n\t *\t\t\t\t\tkey: 'class',\n\t *\t\t\t\t\tvalue: 'align-center'\n\t *\t\t\t\t}\n\t *\t\t\t},\n\t *\t\t\tupcastAlso: {\n\t *\t\t\t\tright: {\n\t *\t\t\t\t\tstyles: {\n\t *\t\t\t\t\t\t'text-align': 'right'\n\t *\t\t\t\t\t}\n\t *\t\t\t\t},\n\t *\t\t\t\tcenter: {\n\t *\t\t\t\t\tstyles: {\n\t *\t\t\t\t\t\t'text-align': 'center'\n\t *\t\t\t\t\t}\n\t *\t\t\t\t}\n\t *\t\t\t}\n\t *\t\t} );\n\t *\n\t * The `definition.model` parameter specifies which model attribute should be converted from and to.\n\t * It can be a `{ key, [ values ], [ name ] }` object or a `String`, which will be treated like `{ key: definition.model }`.\n\t * The `key` property is the model attribute key to convert from and to.\n\t * The `values` are the possible model attribute values. If `values` is not set, the model attribute value will be the same as the\n\t * view attribute value.\n\t * If `name` is set, the conversion will be set up only for model elements with the given name.\n\t *\n\t * The `definition.view` parameter specifies which view attribute should be converted from and to.\n\t * It can be a `{ key, value, [ name ] }` object or a `String`, which will be treated like `{ key: definition.view }`.\n\t * The `key` property is the view attribute key to convert from and to.\n\t * The `value` is the view attribute value to convert from and to. If `definition.value` is not set, the view attribute value will be\n\t * the same as the model attribute value.\n\t * If `key` is `'class'`, `value` can be a `String` or an array of `String`s.\n\t * If `key` is `'style'`, `value` is an object with key-value pairs.\n\t * In other cases, `value` is a `String`.\n\t * If `name` is set, the conversion will be set up only for model elements with the given name.\n\t * If `definition.model.values` is set, `definition.view` is an object that assigns values from `definition.model.values`\n\t * to `{ key, value, [ name ] }` objects.\n\t *\n\t * `definition.upcastAlso` specifies which other matching view elements should also be upcast to the given model configuration.\n\t * If `definition.model.values` is set, `definition.upcastAlso` should be an object assigning values from `definition.model.values`\n\t * to {@link module:engine/view/matcher~MatcherPattern}s or arrays of {@link module:engine/view/matcher~MatcherPattern}s.\n\t *\n\t * **Note:** `definition.model` and `definition.view` form should be mirrored, so the same types of parameters should\n\t * be given in both parameters.\n\t *\n\t * @param {Object} definition The converter definition.\n\t * @param {String|Object} definition.model The model attribute to convert from and to.\n\t * @param {String|Object} definition.view The view attribute to convert from and to.\n\t * @param {module:engine/view/matcher~MatcherPattern|Array.<module:engine/view/matcher~MatcherPattern>} [definition.upcastAlso]\n\t * Any view element matching `definition.upcastAlso` will also be converted to the given model attribute. `definition.upcastAlso`\n\t * is used only if `config.model.values` is specified.\n\t */\n\tattributeToAttribute( definition ) {\n\t\t// Set up downcast converter.\n\t\tthis.for( 'downcast' ).attributeToAttribute( definition );\n\n\t\t// Set up upcast converter.\n\t\tfor ( const { model, view } of _getAllUpcastDefinitions( definition ) ) {\n\t\t\tthis.for( 'upcast' )\n\t\t\t\t.attributeToAttribute( {\n\t\t\t\t\tview,\n\t\t\t\t\tmodel\n\t\t\t\t} );\n\t\t}\n\t}\n\n\t/**\n\t * Creates and caches conversion helpers for given dispatchers group.\n\t *\n\t * @private\n\t * @param {Object} options\n\t * @param {String} options.name Group name.\n\t * @param {Array.<module:engine/conversion/downcastdispatcher~DowncastDispatcher|\n\t * module:engine/conversion/upcastdispatcher~UpcastDispatcher>} options.dispatchers\n\t * @param {Boolean} options.isDowncast\n\t */\n\t_createConversionHelpers( { name, dispatchers, isDowncast } ) {\n\t\tif ( this._helpers.has( name ) ) {\n\t\t\t/**\n\t\t\t * Trying to register a group name that has already been registered.\n\t\t\t *\n\t\t\t * @error conversion-group-exists\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'conversion-group-exists', this );\n\t\t}\n\n\t\tconst helpers = isDowncast ? new DowncastHelpers( dispatchers ) : new UpcastHelpers( dispatchers );\n\n\t\tthis._helpers.set( name, helpers );\n\t}\n}\n\n/**\n * Defines how the model should be converted from and to the view.\n *\n * @typedef {Object} module:engine/conversion/conversion~ConverterDefinition\n *\n * @property {*} [model] The model conversion definition. Describes the model element or model attribute to convert. This parameter differs\n * for different functions that accept `ConverterDefinition`. See the description of the function to learn how to set it.\n * @property {module:engine/view/elementdefinition~ElementDefinition|Object} view The definition of the view element to convert from and\n * to. If `model` describes multiple values, `view` is an object that assigns these values (`view` object keys) to view element definitions\n * (`view` object values).\n * @property {module:engine/view/matcher~MatcherPattern|Array.<module:engine/view/matcher~MatcherPattern>} [upcastAlso]\n * Any view element matching `upcastAlso` will also be converted to the model. If `model` describes multiple values, `upcastAlso`\n * is an object that assigns these values (`upcastAlso` object keys) to {@link module:engine/view/matcher~MatcherPattern}s\n * (`upcastAlso` object values).\n * @property {module:utils/priorities~PriorityString} [converterPriority] The converter priority.\n */\n\n// Helper function that creates a joint array out of an item passed in `definition.view` and items passed in\n// `definition.upcastAlso`.\n//\n// @param {module:engine/conversion/conversion~ConverterDefinition} definition\n// @returns {Array} Array containing view definitions.\nfunction* _getAllUpcastDefinitions( definition ) {\n\tif ( definition.model.values ) {\n\t\tfor ( const value of definition.model.values ) {\n\t\t\tconst model = { key: definition.model.key, value };\n\t\t\tconst view = definition.view[ value ];\n\t\t\tconst upcastAlso = definition.upcastAlso ? definition.upcastAlso[ value ] : undefined;\n\n\t\t\tyield* _getUpcastDefinition( model, view, upcastAlso );\n\t\t}\n\t} else {\n\t\tyield* _getUpcastDefinition( definition.model, definition.view, definition.upcastAlso );\n\t}\n}\n\nfunction* _getUpcastDefinition( model, view, upcastAlso ) {\n\tyield { model, view };\n\n\tif ( upcastAlso ) {\n\t\tfor ( const upcastAlsoItem of toArray( upcastAlso ) ) {\n\t\t\tyield { model, view: upcastAlsoItem };\n\t\t}\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module engine/model/batch\n */\n\n/**\n * A batch instance groups model changes ({@link module:engine/model/operation/operation~Operation operations}). All operations\n * grouped in a single batch can be reverted together, so you can also think about a batch as of a single undo step. If you want\n * to extend a given undo step, you can add more changes to the batch using {@link module:engine/model/model~Model#enqueueChange}:\n *\n *\t\tmodel.enqueueChange( batch, writer => {\n *\t\t\twriter.insertText( 'foo', paragraph, 'end' );\n *\t\t} );\n *\n * @see module:engine/model/model~Model#enqueueChange\n * @see module:engine/model/model~Model#change\n */\nexport default class Batch {\n\t/**\n\t * Creates a batch instance.\n\t *\n\t * @see module:engine/model/model~Model#enqueueChange\n\t * @see module:engine/model/model~Model#change\n\t * @param {'transparent'|'default'} [type='default'] The type of the batch.\n\t */\n\tconstructor( type = 'default' ) {\n\t\t/**\n\t\t * An array of operations that compose this batch.\n\t\t *\n\t\t * @readonly\n\t\t * @type {Array.<module:engine/model/operation/operation~Operation>}\n\t\t */\n\t\tthis.operations = [];\n\n\t\t/**\n\t\t * The type of the batch.\n\t\t *\n\t\t * It can be one of the following values:\n\t\t * * `'default'` &ndash; All \"normal\" batches. This is the most commonly used type.\n\t\t * * `'transparent'` &ndash; A batch that should be ignored by other features, i.e. an initial batch or collaborative editing\n\t\t * changes.\n\t\t *\n\t\t * @readonly\n\t\t * @type {'transparent'|'default'}\n\t\t */\n\t\tthis.type = type;\n\t}\n\n\t/**\n\t * Returns the base version of this batch, which is equal to the base version of the first operation in the batch.\n\t * If there are no operations in the batch or neither operation has the base version set, it returns `null`.\n\t *\n\t * @readonly\n\t * @type {Number|null}\n\t */\n\tget baseVersion() {\n\t\tfor ( const op of this.operations ) {\n\t\t\tif ( op.baseVersion !== null ) {\n\t\t\t\treturn op.baseVersion;\n\t\t\t}\n\t\t}\n\n\t\treturn null;\n\t}\n\n\t/**\n\t * Adds an operation to the batch instance.\n\t *\n\t * @param {module:engine/model/operation/operation~Operation} operation An operation to add.\n\t * @returns {module:engine/model/operation/operation~Operation} The added operation.\n\t */\n\taddOperation( operation ) {\n\t\toperation.batch = this;\n\t\tthis.operations.push( operation );\n\n\t\treturn operation;\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module engine/model/operation/operation\n */\n\n/**\n * Abstract base operation class.\n *\n * @abstract\n */\nexport default class Operation {\n\t/**\n\t * Base operation constructor.\n\t *\n\t * @param {Number|null} baseVersion Document {@link module:engine/model/document~Document#version} on which operation\n\t * can be applied or `null` if the operation operates on detached (non-document) tree.\n\t */\n\tconstructor( baseVersion ) {\n\t\t/**\n\t\t * {@link module:engine/model/document~Document#version} on which operation can be applied. If you try to\n\t\t * {@link module:engine/model/model~Model#applyOperation apply} operation with different base version than the\n\t\t * {@link module:engine/model/document~Document#version document version} the\n\t\t * {@link module:utils/ckeditorerror~CKEditorError model-document-applyOperation-wrong-version} error is thrown.\n\t\t *\n\t\t * @member {Number}\n\t\t */\n\t\tthis.baseVersion = baseVersion;\n\n\t\t/**\n\t\t * Defines whether operation is executed on attached or detached {@link module:engine/model/item~Item items}.\n\t\t *\n\t\t * @readonly\n\t\t * @member {Boolean} #isDocumentOperation\n\t\t */\n\t\tthis.isDocumentOperation = this.baseVersion !== null;\n\n\t\t/**\n\t\t * {@link module:engine/model/batch~Batch Batch} to which the operation is added or `null` if the operation is not\n\t\t * added to any batch yet.\n\t\t *\n\t\t * @member {module:engine/model/batch~Batch|null} #batch\n\t\t */\n\t\tthis.batch = null;\n\n\t\t/**\n\t\t * Operation type.\n\t\t *\n\t\t * @readonly\n\t\t * @member {String} #type\n\t\t */\n\n\t\t/**\n\t\t * Creates and returns an operation that has the same parameters as this operation.\n\t\t *\n\t\t * @method #clone\n\t\t * @returns {module:engine/model/operation/operation~Operation} Clone of this operation.\n\t\t */\n\n\t\t/**\n\t\t * Creates and returns a reverse operation. Reverse operation when executed right after\n\t\t * the original operation will bring back tree model state to the point before the original\n\t\t * operation execution. In other words, it reverses changes done by the original operation.\n\t\t *\n\t\t * Keep in mind that tree model state may change since executing the original operation,\n\t\t * so reverse operation will be \"outdated\". In that case you will need to transform it by\n\t\t * all operations that were executed after the original operation.\n\t\t *\n\t\t * @method #getReversed\n\t\t * @returns {module:engine/model/operation/operation~Operation} Reversed operation.\n\t\t */\n\n\t\t/**\n\t\t * Executes the operation - modifications described by the operation properties will be applied to the model tree.\n\t\t *\n\t\t * @protected\n\t\t * @method #_execute\n\t\t */\n\t}\n\n\t/**\n\t * Checks whether the operation's parameters are correct and the operation can be correctly executed. Throws\n\t * an error if operation is not valid.\n\t *\n\t * @protected\n\t * @method #_validate\n\t */\n\t_validate() {\n\t}\n\n\t/**\n\t * Custom toJSON method to solve child-parent circular dependencies.\n\t *\n\t * @method #toJSON\n\t * @returns {Object} Clone of this object with the operation property replaced with string.\n\t */\n\ttoJSON() {\n\t\t// This method creates only a shallow copy, all nested objects should be defined separately.\n\t\t// See https://github.com/ckeditor/ckeditor5-engine/issues/1477.\n\t\tconst json = Object.assign( {}, this );\n\n\t\tjson.__className = this.constructor.className;\n\n\t\t// Remove reference to the parent `Batch` to avoid circular dependencies.\n\t\tdelete json.batch;\n\n\t\t// Only document operations are shared with other clients so it is not necessary to keep this information.\n\t\tdelete json.isDocumentOperation;\n\n\t\treturn json;\n\t}\n\n\t/**\n\t * Name of the operation class used for serialization.\n\t *\n\t * @type {String}\n\t */\n\tstatic get className() {\n\t\treturn 'Operation';\n\t}\n\n\t/**\n\t * Creates Operation object from deserilized object, i.e. from parsed JSON string.\n\t *\n\t * @param {Object} json Deserialized JSON object.\n\t * @param {module:engine/model/document~Document} doc Document on which this operation will be applied.\n\t * @returns {module:engine/model/operation/operation~Operation}\n\t */\n\tstatic fromJSON( json ) {\n\t\treturn new this( json.baseVersion );\n\t}\n\n\t// @if CK_DEBUG_ENGINE // log() {\n\t// @if CK_DEBUG_ENGINE // \tconsole.log( this.toString() );\n\t// @if CK_DEBUG_ENGINE // }\n}\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module module:engine/model/documentfragment\n */\n\nimport NodeList from './nodelist';\nimport Element from './element';\nimport Text from './text';\nimport TextProxy from './textproxy';\nimport isIterable from '@ckeditor/ckeditor5-utils/src/isiterable';\n\n// @if CK_DEBUG_ENGINE // const { stringifyMap } = require( '../dev-utils/utils' );\n\n/**\n * DocumentFragment represents a part of model which does not have a common root but it's top-level nodes\n * can be seen as siblings. In other words, it is a detached part of model tree, without a root.\n *\n * DocumentFragment has own {@link module:engine/model/markercollection~MarkerCollection}. Markers from this collection\n * will be set to the {@link module:engine/model/model~Model#markers model markers} by a\n * {@link module:engine/model/writer~Writer#insert} function.\n */\nexport default class DocumentFragment {\n\t/**\n\t * Creates an empty `DocumentFragment`.\n\t *\n\t * **Note:** Constructor of this class shouldn't be used directly in the code.\n\t * Use the {@link module:engine/model/writer~Writer#createDocumentFragment} method instead.\n\t *\n\t * @protected\n\t * @param {module:engine/model/node~Node|Iterable.<module:engine/model/node~Node>} [children]\n\t * Nodes to be contained inside the `DocumentFragment`.\n\t */\n\tconstructor( children ) {\n\t\t/**\n\t\t * DocumentFragment static markers map. This is a list of names and {@link module:engine/model/range~Range ranges}\n\t\t * which will be set as Markers to {@link module:engine/model/model~Model#markers model markers collection}\n\t\t * when DocumentFragment will be inserted to the document.\n\t\t *\n\t\t * @readonly\n\t\t * @member {Map<String,module:engine/model/range~Range>} module:engine/model/documentfragment~DocumentFragment#markers\n\t\t */\n\t\tthis.markers = new Map();\n\n\t\t/**\n\t\t * List of nodes contained inside the document fragment.\n\t\t *\n\t\t * @private\n\t\t * @member {module:engine/model/nodelist~NodeList} module:engine/model/documentfragment~DocumentFragment#_children\n\t\t */\n\t\tthis._children = new NodeList();\n\n\t\tif ( children ) {\n\t\t\tthis._insertChild( 0, children );\n\t\t}\n\t}\n\n\t/**\n\t * Returns an iterator that iterates over all nodes contained inside this document fragment.\n\t *\n\t * @returns {Iterable.<module:engine/model/node~Node>}\n\t */\n\t[ Symbol.iterator ]() {\n\t\treturn this.getChildren();\n\t}\n\n\t/**\n\t * Number of this document fragment's children.\n\t *\n\t * @readonly\n\t * @type {Number}\n\t */\n\tget childCount() {\n\t\treturn this._children.length;\n\t}\n\n\t/**\n\t * Sum of {@link module:engine/model/node~Node#offsetSize offset sizes} of all of this document fragment's children.\n\t *\n\t * @readonly\n\t * @type {Number}\n\t */\n\tget maxOffset() {\n\t\treturn this._children.maxOffset;\n\t}\n\n\t/**\n\t * Is `true` if there are no nodes inside this document fragment, `false` otherwise.\n\t *\n\t * @readonly\n\t * @type {Boolean}\n\t */\n\tget isEmpty() {\n\t\treturn this.childCount === 0;\n\t}\n\n\t/**\n\t * Artificial root of `DocumentFragment`. Returns itself. Added for compatibility reasons.\n\t *\n\t * @readonly\n\t * @type {module:engine/model/documentfragment~DocumentFragment}\n\t */\n\tget root() {\n\t\treturn this;\n\t}\n\n\t/**\n\t * Artificial parent of `DocumentFragment`. Returns `null`. Added for compatibility reasons.\n\t *\n\t * @readonly\n\t * @type {null}\n\t */\n\tget parent() {\n\t\treturn null;\n\t}\n\n\t/**\n\t * Checks whether this object is of the given type.\n\t *\n\t *\t\tdocFrag.is( 'documentFragment' ); // -> true\n\t *\t\tdocFrag.is( 'model:documentFragment' ); // -> true\n\t *\n\t *\t\tdocFrag.is( 'view:documentFragment' ); // -> false\n\t *\t\tdocFrag.is( 'element' ); // -> false\n\t *\t\tdocFrag.is( 'node' ); // -> false\n\t *\n\t * {@link module:engine/model/node~Node#is Check the entire list of model objects} which implement the `is()` method.\n\t *\n\t * @param {String} type\n\t * @returns {Boolean}\n\t */\n\tis( type ) {\n\t\treturn type === 'documentFragment' || type === 'model:documentFragment';\n\t}\n\n\t/**\n\t * Gets the child at the given index. Returns `null` if incorrect index was passed.\n\t *\n\t * @param {Number} index Index of child.\n\t * @returns {module:engine/model/node~Node|null} Child node.\n\t */\n\tgetChild( index ) {\n\t\treturn this._children.getNode( index );\n\t}\n\n\t/**\n\t * Returns an iterator that iterates over all of this document fragment's children.\n\t *\n\t * @returns {Iterable.<module:engine/model/node~Node>}\n\t */\n\tgetChildren() {\n\t\treturn this._children[ Symbol.iterator ]();\n\t}\n\n\t/**\n\t * Returns an index of the given child node. Returns `null` if given node is not a child of this document fragment.\n\t *\n\t * @param {module:engine/model/node~Node} node Child node to look for.\n\t * @returns {Number|null} Child node's index.\n\t */\n\tgetChildIndex( node ) {\n\t\treturn this._children.getNodeIndex( node );\n\t}\n\n\t/**\n\t * Returns the starting offset of given child. Starting offset is equal to the sum of\n\t * {@link module:engine/model/node~Node#offsetSize offset sizes} of all node's siblings that are before it. Returns `null` if\n\t * given node is not a child of this document fragment.\n\t *\n\t * @param {module:engine/model/node~Node} node Child node to look for.\n\t * @returns {Number|null} Child node's starting offset.\n\t */\n\tgetChildStartOffset( node ) {\n\t\treturn this._children.getNodeStartOffset( node );\n\t}\n\n\t/**\n\t * Returns path to a `DocumentFragment`, which is an empty array. Added for compatibility reasons.\n\t *\n\t * @returns {Array}\n\t */\n\tgetPath() {\n\t\treturn [];\n\t}\n\n\t/**\n\t * Returns a descendant node by its path relative to this element.\n\t *\n\t *\t\t// <this>a<b>c</b></this>\n\t *\t\tthis.getNodeByPath( [ 0 ] );     // -> \"a\"\n\t *\t\tthis.getNodeByPath( [ 1 ] );     // -> <b>\n\t *\t\tthis.getNodeByPath( [ 1, 0 ] );  // -> \"c\"\n\t *\n\t * @param {Array.<Number>} relativePath Path of the node to find, relative to this element.\n\t * @returns {module:engine/model/node~Node|module:engine/model/documentfragment~DocumentFragment}\n\t */\n\tgetNodeByPath( relativePath ) {\n\t\tlet node = this; // eslint-disable-line consistent-this\n\n\t\tfor ( const index of relativePath ) {\n\t\t\tnode = node.getChild( node.offsetToIndex( index ) );\n\t\t}\n\n\t\treturn node;\n\t}\n\n\t/**\n\t * Converts offset \"position\" to index \"position\".\n\t *\n\t * Returns index of a node that occupies given offset. If given offset is too low, returns `0`. If given offset is\n\t * too high, returns index after last child}.\n\t *\n\t *\t\tconst textNode = new Text( 'foo' );\n\t *\t\tconst pElement = new Element( 'p' );\n\t *\t\tconst docFrag = new DocumentFragment( [ textNode, pElement ] );\n\t *\t\tdocFrag.offsetToIndex( -1 ); // Returns 0, because offset is too low.\n\t *\t\tdocFrag.offsetToIndex( 0 ); // Returns 0, because offset 0 is taken by `textNode` which is at index 0.\n\t *\t\tdocFrag.offsetToIndex( 1 ); // Returns 0, because `textNode` has `offsetSize` equal to 3, so it occupies offset 1 too.\n\t *\t\tdocFrag.offsetToIndex( 2 ); // Returns 0.\n\t *\t\tdocFrag.offsetToIndex( 3 ); // Returns 1.\n\t *\t\tdocFrag.offsetToIndex( 4 ); // Returns 2. There are no nodes at offset 4, so last available index is returned.\n\t *\n\t * @param {Number} offset Offset to look for.\n\t * @returns {Number} Index of a node that occupies given offset.\n\t */\n\toffsetToIndex( offset ) {\n\t\treturn this._children.offsetToIndex( offset );\n\t}\n\n\t/**\n\t * Converts `DocumentFragment` instance to plain object and returns it.\n\t * Takes care of converting all of this document fragment's children.\n\t *\n\t * @returns {Object} `DocumentFragment` instance converted to plain object.\n\t */\n\ttoJSON() {\n\t\tconst json = [];\n\n\t\tfor ( const node of this._children ) {\n\t\t\tjson.push( node.toJSON() );\n\t\t}\n\n\t\treturn json;\n\t}\n\n\t/**\n\t * Creates a `DocumentFragment` instance from given plain object (i.e. parsed JSON string).\n\t * Converts `DocumentFragment` children to proper nodes.\n\t *\n\t * @param {Object} json Plain object to be converted to `DocumentFragment`.\n\t * @returns {module:engine/model/documentfragment~DocumentFragment} `DocumentFragment` instance created using given plain object.\n\t */\n\tstatic fromJSON( json ) {\n\t\tconst children = [];\n\n\t\tfor ( const child of json ) {\n\t\t\tif ( child.name ) {\n\t\t\t\t// If child has name property, it is an Element.\n\t\t\t\tchildren.push( Element.fromJSON( child ) );\n\t\t\t} else {\n\t\t\t\t// Otherwise, it is a Text node.\n\t\t\t\tchildren.push( Text.fromJSON( child ) );\n\t\t\t}\n\t\t}\n\n\t\treturn new DocumentFragment( children );\n\t}\n\n\t/**\n\t * {@link #_insertChild Inserts} one or more nodes at the end of this document fragment.\n\t *\n\t * @protected\n\t * @param {module:engine/model/item~Item|Iterable.<module:engine/model/item~Item>} items Items to be inserted.\n\t */\n\t_appendChild( items ) {\n\t\tthis._insertChild( this.childCount, items );\n\t}\n\n\t/**\n\t * Inserts one or more nodes at the given index and sets {@link module:engine/model/node~Node#parent parent} of these nodes\n\t * to this document fragment.\n\t *\n\t * @protected\n\t * @param {Number} index Index at which nodes should be inserted.\n\t * @param {module:engine/model/item~Item|Iterable.<module:engine/model/item~Item>} items Items to be inserted.\n\t */\n\t_insertChild( index, items ) {\n\t\tconst nodes = normalize( items );\n\n\t\tfor ( const node of nodes ) {\n\t\t\t// If node that is being added to this element is already inside another element, first remove it from the old parent.\n\t\t\tif ( node.parent !== null ) {\n\t\t\t\tnode._remove();\n\t\t\t}\n\n\t\t\tnode.parent = this;\n\t\t}\n\n\t\tthis._children._insertNodes( index, nodes );\n\t}\n\n\t/**\n\t * Removes one or more nodes starting at the given index\n\t * and sets {@link module:engine/model/node~Node#parent parent} of these nodes to `null`.\n\t *\n\t * @protected\n\t * @param {Number} index Index of the first node to remove.\n\t * @param {Number} [howMany=1] Number of nodes to remove.\n\t * @returns {Array.<module:engine/model/node~Node>} Array containing removed nodes.\n\t */\n\t_removeChildren( index, howMany = 1 ) {\n\t\tconst nodes = this._children._removeNodes( index, howMany );\n\n\t\tfor ( const node of nodes ) {\n\t\t\tnode.parent = null;\n\t\t}\n\n\t\treturn nodes;\n\t}\n\n\t// @if CK_DEBUG_ENGINE // toString() {\n\t// @if CK_DEBUG_ENGINE // \treturn 'documentFragment';\n\t// @if CK_DEBUG_ENGINE // }\n\n\t// @if CK_DEBUG_ENGINE // log() {\n\t// @if CK_DEBUG_ENGINE // \tconsole.log( 'ModelDocumentFragment: ' + this );\n\t// @if CK_DEBUG_ENGINE // }\n\n\t// @if CK_DEBUG_ENGINE // printTree() {\n\t// @if CK_DEBUG_ENGINE //\tlet string = 'ModelDocumentFragment: [';\n\n\t// @if CK_DEBUG_ENGINE //\tfor ( const child of this.getChildren() ) {\n\t// @if CK_DEBUG_ENGINE //\t\tstring += '\\n';\n\n\t// @if CK_DEBUG_ENGINE //\t\tif ( child.is( '$text' ) ) {\n\t// @if CK_DEBUG_ENGINE //\t\t\tconst textAttrs = stringifyMap( child._attrs );\n\n\t// @if CK_DEBUG_ENGINE //\t\t\tstring += '\\t'.repeat( 1 );\n\n\t// @if CK_DEBUG_ENGINE //\t\t\tif ( textAttrs !== '' ) {\n\t// @if CK_DEBUG_ENGINE //\t\t\t\tstring += `<$text${ textAttrs }>` + child.data + '</$text>';\n\t// @if CK_DEBUG_ENGINE //\t\t\t} else {\n\t// @if CK_DEBUG_ENGINE //\t\t\t\tstring += child.data;\n\t// @if CK_DEBUG_ENGINE //\t\t\t}\n\t// @if CK_DEBUG_ENGINE //\t\t} else {\n\t// @if CK_DEBUG_ENGINE //\t\t\tstring += child.printTree( 1 );\n\t// @if CK_DEBUG_ENGINE //\t\t}\n\t// @if CK_DEBUG_ENGINE //\t}\n\n\t// @if CK_DEBUG_ENGINE //\tstring += '\\n]';\n\n\t// @if CK_DEBUG_ENGINE //\treturn string;\n\t// @if CK_DEBUG_ENGINE // }\n\n\t// @if CK_DEBUG_ENGINE // logTree() {\n\t// @if CK_DEBUG_ENGINE // \tconsole.log( this.printTree() );\n\t// @if CK_DEBUG_ENGINE // }\n}\n\n// Converts strings to Text and non-iterables to arrays.\n//\n// @param {String|module:engine/model/item~Item|Iterable.<module:engine/model/item~Item>}\n// @returns {Iterable.<module:engine/model/node~Node>}\nfunction normalize( nodes ) {\n\t// Separate condition because string is iterable.\n\tif ( typeof nodes == 'string' ) {\n\t\treturn [ new Text( nodes ) ];\n\t}\n\n\tif ( !isIterable( nodes ) ) {\n\t\tnodes = [ nodes ];\n\t}\n\n\t// Array.from to enable .map() on non-arrays.\n\treturn Array.from( nodes )\n\t\t.map( node => {\n\t\t\tif ( typeof node == 'string' ) {\n\t\t\t\treturn new Text( node );\n\t\t\t}\n\n\t\t\tif ( node instanceof TextProxy ) {\n\t\t\t\treturn new Text( node.data, node.getAttributes() );\n\t\t\t}\n\n\t\t\treturn node;\n\t\t} );\n}\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module engine/model/operation/utils\n */\n\nimport Node from '../node';\nimport Text from '../text';\nimport TextProxy from '../textproxy';\nimport Range from '../range';\nimport DocumentFragment from '../documentfragment';\nimport NodeList from '../nodelist';\nimport CKEditorError from '@ckeditor/ckeditor5-utils/src/ckeditorerror';\n\n/**\n * Contains functions used for composing model tree by {@link module:engine/model/operation/operation~Operation operations}.\n * Those functions are built on top of {@link module:engine/model/node~Node node}, and it's child classes', APIs.\n *\n * @protected\n * @namespace utils\n */\n\n/**\n * Inserts given nodes at given position.\n *\n * @protected\n * @function module:engine/model/operation/utils~utils.insert\n * @param {module:engine/model/position~Position} position Position at which nodes should be inserted.\n * @param {module:engine/model/node~NodeSet} nodes Nodes to insert.\n * @returns {module:engine/model/range~Range} Range spanning over inserted elements.\n */\nexport function _insert( position, nodes ) {\n\tnodes = _normalizeNodes( nodes );\n\n\t// We have to count offset before inserting nodes because they can get merged and we would get wrong offsets.\n\tconst offset = nodes.reduce( ( sum, node ) => sum + node.offsetSize, 0 );\n\tconst parent = position.parent;\n\n\t// Insertion might be in a text node, we should split it if that's the case.\n\t_splitNodeAtPosition( position );\n\tconst index = position.index;\n\n\t// Insert nodes at given index. After splitting we have a proper index and insertion is between nodes,\n\t// using basic `Element` API.\n\tparent._insertChild( index, nodes );\n\n\t// Merge text nodes, if possible. Merging is needed only at points where inserted nodes \"touch\" \"old\" nodes.\n\t_mergeNodesAtIndex( parent, index + nodes.length );\n\t_mergeNodesAtIndex( parent, index );\n\n\treturn new Range( position, position.getShiftedBy( offset ) );\n}\n\n/**\n * Removed nodes in given range. Only {@link module:engine/model/range~Range#isFlat flat} ranges are accepted.\n *\n * @protected\n * @function module:engine/model/operation/utils~utils._remove\n * @param {module:engine/model/range~Range} range Range containing nodes to remove.\n * @returns {Array.<module:engine/model/node~Node>}\n */\nexport function _remove( range ) {\n\tif ( !range.isFlat ) {\n\t\t/**\n\t\t * Trying to remove a range which starts and ends in different element.\n\t\t *\n\t\t * @error operation-utils-remove-range-not-flat\n\t\t */\n\t\tthrow new CKEditorError(\n\t\t\t'operation-utils-remove-range-not-flat',\n\t\t\tthis\n\t\t);\n\t}\n\n\tconst parent = range.start.parent;\n\n\t// Range may be inside text nodes, we have to split them if that's the case.\n\t_splitNodeAtPosition( range.start );\n\t_splitNodeAtPosition( range.end );\n\n\t// Remove the text nodes using basic `Element` API.\n\tconst removed = parent._removeChildren( range.start.index, range.end.index - range.start.index );\n\n\t// Merge text nodes, if possible. After some nodes were removed, node before and after removed range will be\n\t// touching at the position equal to the removed range beginning. We check merging possibility there.\n\t_mergeNodesAtIndex( parent, range.start.index );\n\n\treturn removed;\n}\n\n/**\n * Moves nodes in given range to given target position. Only {@link module:engine/model/range~Range#isFlat flat} ranges are accepted.\n *\n * @protected\n * @function module:engine/model/operation/utils~utils.move\n * @param {module:engine/model/range~Range} sourceRange Range containing nodes to move.\n * @param {module:engine/model/position~Position} targetPosition Position to which nodes should be moved.\n * @returns {module:engine/model/range~Range} Range containing moved nodes.\n */\nexport function _move( sourceRange, targetPosition ) {\n\tif ( !sourceRange.isFlat ) {\n\t\t/**\n\t\t * Trying to move a range which starts and ends in different element.\n\t\t *\n\t\t * @error operation-utils-move-range-not-flat\n\t\t */\n\t\tthrow new CKEditorError(\n\t\t\t'operation-utils-move-range-not-flat',\n\t\t\tthis\n\t\t);\n\t}\n\n\tconst nodes = _remove( sourceRange );\n\n\t// We have to fix `targetPosition` because model changed after nodes from `sourceRange` got removed and\n\t// that change might have an impact on `targetPosition`.\n\ttargetPosition = targetPosition._getTransformedByDeletion( sourceRange.start, sourceRange.end.offset - sourceRange.start.offset );\n\n\treturn _insert( targetPosition, nodes );\n}\n\n/**\n * Sets given attribute on nodes in given range. The attributes are only set on top-level nodes of the range, not on its children.\n *\n * @protected\n * @function module:engine/model/operation/utils~utils._setAttribute\n * @param {module:engine/model/range~Range} range Range containing nodes that should have the attribute set. Must be a flat range.\n * @param {String} key Key of attribute to set.\n * @param {*} value Attribute value.\n */\nexport function _setAttribute( range, key, value ) {\n\t// Range might start or end in text nodes, so we have to split them.\n\t_splitNodeAtPosition( range.start );\n\t_splitNodeAtPosition( range.end );\n\n\t// Iterate over all items in the range.\n\tfor ( const item of range.getItems( { shallow: true } ) ) {\n\t\t// Iterator will return `TextProxy` instances but we know that those text proxies will\n\t\t// always represent full text nodes (this is guaranteed thanks to splitting we did before).\n\t\t// So, we can operate on those text proxies' text nodes.\n\t\tconst node = item.is( '$textProxy' ) ? item.textNode : item;\n\n\t\tif ( value !== null ) {\n\t\t\tnode._setAttribute( key, value );\n\t\t} else {\n\t\t\tnode._removeAttribute( key );\n\t\t}\n\n\t\t// After attributes changing it may happen that some text nodes can be merged. Try to merge with previous node.\n\t\t_mergeNodesAtIndex( node.parent, node.index );\n\t}\n\n\t// Try to merge last changed node with it's previous sibling (not covered by the loop above).\n\t_mergeNodesAtIndex( range.end.parent, range.end.index );\n}\n\n/**\n * Normalizes given object or an array of objects to an array of {@link module:engine/model/node~Node nodes}. See\n * {@link module:engine/model/node~NodeSet NodeSet} for details on how normalization is performed.\n *\n * @protected\n * @function module:engine/model/operation/utils~utils.normalizeNodes\n * @param {module:engine/model/node~NodeSet} nodes Objects to normalize.\n * @returns {Array.<module:engine/model/node~Node>} Normalized nodes.\n */\nexport function _normalizeNodes( nodes ) {\n\tconst normalized = [];\n\n\tif ( !( nodes instanceof Array ) ) {\n\t\tnodes = [ nodes ];\n\t}\n\n\t// Convert instances of classes other than Node.\n\tfor ( let i = 0; i < nodes.length; i++ ) {\n\t\tif ( typeof nodes[ i ] == 'string' ) {\n\t\t\tnormalized.push( new Text( nodes[ i ] ) );\n\t\t} else if ( nodes[ i ] instanceof TextProxy ) {\n\t\t\tnormalized.push( new Text( nodes[ i ].data, nodes[ i ].getAttributes() ) );\n\t\t} else if ( nodes[ i ] instanceof DocumentFragment || nodes[ i ] instanceof NodeList ) {\n\t\t\tfor ( const child of nodes[ i ] ) {\n\t\t\t\tnormalized.push( child );\n\t\t\t}\n\t\t} else if ( nodes[ i ] instanceof Node ) {\n\t\t\tnormalized.push( nodes[ i ] );\n\t\t}\n\t\t// Skip unrecognized type.\n\t}\n\n\t// Merge text nodes.\n\tfor ( let i = 1; i < normalized.length; i++ ) {\n\t\tconst node = normalized[ i ];\n\t\tconst prev = normalized[ i - 1 ];\n\n\t\tif ( node instanceof Text && prev instanceof Text && _haveSameAttributes( node, prev ) ) {\n\t\t\t// Doing this instead changing `prev.data` because `data` is readonly.\n\t\t\tnormalized.splice( i - 1, 2, new Text( prev.data + node.data, prev.getAttributes() ) );\n\t\t\ti--;\n\t\t}\n\t}\n\n\treturn normalized;\n}\n\n// Checks if nodes before and after given index in given element are {@link module:engine/model/text~Text text nodes} and\n// merges them into one node if they have same attributes.\n//\n// Merging is done by removing two text nodes and inserting a new text node containing data from both merged text nodes.\n//\n// @private\n// @param {module:engine/model/element~Element} element Parent element of nodes to merge.\n// @param {Number} index Index between nodes to merge.\nfunction _mergeNodesAtIndex( element, index ) {\n\tconst nodeBefore = element.getChild( index - 1 );\n\tconst nodeAfter = element.getChild( index );\n\n\t// Check if both of those nodes are text objects with same attributes.\n\tif ( nodeBefore && nodeAfter && nodeBefore.is( '$text' ) && nodeAfter.is( '$text' ) && _haveSameAttributes( nodeBefore, nodeAfter ) ) {\n\t\t// Append text of text node after index to the before one.\n\t\tconst mergedNode = new Text( nodeBefore.data + nodeAfter.data, nodeBefore.getAttributes() );\n\n\t\t// Remove separate text nodes.\n\t\telement._removeChildren( index - 1, 2 );\n\n\t\t// Insert merged text node.\n\t\telement._insertChild( index - 1, mergedNode );\n\t}\n}\n\n// Checks if given position is in a text node, and if so, splits the text node in two text nodes, each of them\n// containing a part of original text node.\n//\n// @private\n// @param {module:engine/model/position~Position} position Position at which node should be split.\nfunction _splitNodeAtPosition( position ) {\n\tconst textNode = position.textNode;\n\tconst element = position.parent;\n\n\tif ( textNode ) {\n\t\tconst offsetDiff = position.offset - textNode.startOffset;\n\t\tconst index = textNode.index;\n\n\t\telement._removeChildren( index, 1 );\n\n\t\tconst firstPart = new Text( textNode.data.substr( 0, offsetDiff ), textNode.getAttributes() );\n\t\tconst secondPart = new Text( textNode.data.substr( offsetDiff ), textNode.getAttributes() );\n\n\t\telement._insertChild( index, [ firstPart, secondPart ] );\n\t}\n}\n\n// Checks whether two given nodes have same attributes.\n//\n// @private\n// @param {module:engine/model/node~Node} nodeA Node to check.\n// @param {module:engine/model/node~Node} nodeB Node to check.\n// @returns {Boolean} `true` if nodes have same attributes, `false` otherwise.\nfunction _haveSameAttributes( nodeA, nodeB ) {\n\tconst iteratorA = nodeA.getAttributes();\n\tconst iteratorB = nodeB.getAttributes();\n\n\tfor ( const attr of iteratorA ) {\n\t\tif ( attr[ 1 ] !== nodeB.getAttribute( attr[ 0 ] ) ) {\n\t\t\treturn false;\n\t\t}\n\n\t\titeratorB.next();\n\t}\n\n\treturn iteratorB.next().done;\n}\n\n/**\n * Value that can be normalized to an array of {@link module:engine/model/node~Node nodes}.\n *\n * Non-arrays are normalized as follows:\n * * {@link module:engine/model/node~Node Node} is left as is,\n * * {@link module:engine/model/textproxy~TextProxy TextProxy} and `String` are normalized to {@link module:engine/model/text~Text Text},\n * * {@link module:engine/model/nodelist~NodeList NodeList} is normalized to an array containing all nodes that are in that node list,\n * * {@link module:engine/model/documentfragment~DocumentFragment DocumentFragment} is normalized to an array containing all of it's\n * * children.\n *\n * Arrays are processed item by item like non-array values and flattened to one array. Normalization always results in\n * a flat array of {@link module:engine/model/node~Node nodes}. Consecutive text nodes (or items normalized to text nodes) will be\n * merged if they have same attributes.\n *\n * @typedef {module:engine/model/node~Node|module:engine/model/textproxy~TextProxy|String|\n * module:engine/model/nodelist~NodeList|module:engine/model/documentfragment~DocumentFragment|Iterable}\n * module:engine/model/node~NodeSet\n */\n","import baseIsEqual from './_baseIsEqual.js';\n\n/**\n * Performs a deep comparison between two values to determine if they are\n * equivalent.\n *\n * **Note:** This method supports comparing arrays, array buffers, booleans,\n * date objects, error objects, maps, numbers, `Object` objects, regexes,\n * sets, strings, symbols, and typed arrays. `Object` objects are compared\n * by their own, not inherited, enumerable properties. Functions and DOM\n * nodes are compared by strict equality, i.e. `===`.\n *\n * @static\n * @memberOf _\n * @since 0.1.0\n * @category Lang\n * @param {*} value The value to compare.\n * @param {*} other The other value to compare.\n * @returns {boolean} Returns `true` if the values are equivalent, else `false`.\n * @example\n *\n * var object = { 'a': 1 };\n * var other = { 'a': 1 };\n *\n * _.isEqual(object, other);\n * // => true\n *\n * object === other;\n * // => false\n */\nfunction isEqual(value, other) {\n  return baseIsEqual(value, other);\n}\n\nexport default isEqual;\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module engine/model/operation/attributeoperation\n */\n\nimport Operation from './operation';\nimport Range from '../range';\nimport CKEditorError from '@ckeditor/ckeditor5-utils/src/ckeditorerror';\nimport { _setAttribute } from './utils';\nimport { isEqual } from 'lodash-es';\n\n/**\n * Operation to change nodes' attribute.\n *\n * Using this class you can add, remove or change value of the attribute.\n *\n * @extends module:engine/model/operation/operation~Operation\n */\nexport default class AttributeOperation extends Operation {\n\t/**\n\t * Creates an operation that changes, removes or adds attributes.\n\t *\n\t * If only `newValue` is set, attribute will be added on a node. Note that all nodes in operation's range must not\n\t * have an attribute with the same key as the added attribute.\n\t *\n\t * If only `oldValue` is set, then attribute with given key will be removed. Note that all nodes in operation's range\n\t * must have an attribute with that key added.\n\t *\n\t * If both `newValue` and `oldValue` are set, then the operation will change the attribute value. Note that all nodes in\n\t * operation's ranges must already have an attribute with given key and `oldValue` as value\n\t *\n\t * @param {module:engine/model/range~Range} range Range on which the operation should be applied. Must be a flat range.\n\t * @param {String} key Key of an attribute to change or remove.\n\t * @param {*} oldValue Old value of the attribute with given key or `null`, if attribute was not set before.\n\t * @param {*} newValue New value of the attribute with given key or `null`, if operation should remove attribute.\n\t * @param {Number|null} baseVersion Document {@link module:engine/model/document~Document#version} on which operation\n\t * can be applied or `null` if the operation operates on detached (non-document) tree.\n\t */\n\tconstructor( range, key, oldValue, newValue, baseVersion ) {\n\t\tsuper( baseVersion );\n\n\t\t/**\n\t\t * Range on which operation should be applied.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:engine/model/range~Range}\n\t\t */\n\t\tthis.range = range.clone();\n\n\t\t/**\n\t\t * Key of an attribute to change or remove.\n\t\t *\n\t\t * @readonly\n\t\t * @member {String}\n\t\t */\n\t\tthis.key = key;\n\n\t\t/**\n\t\t * Old value of the attribute with given key or `null`, if attribute was not set before.\n\t\t *\n\t\t * @readonly\n\t\t * @member {*}\n\t\t */\n\t\tthis.oldValue = oldValue === undefined ? null : oldValue;\n\n\t\t/**\n\t\t * New value of the attribute with given key or `null`, if operation should remove attribute.\n\t\t *\n\t\t * @readonly\n\t\t * @member {*}\n\t\t */\n\t\tthis.newValue = newValue === undefined ? null : newValue;\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tget type() {\n\t\tif ( this.oldValue === null ) {\n\t\t\treturn 'addAttribute';\n\t\t} else if ( this.newValue === null ) {\n\t\t\treturn 'removeAttribute';\n\t\t} else {\n\t\t\treturn 'changeAttribute';\n\t\t}\n\t}\n\n\t/**\n\t * Creates and returns an operation that has the same parameters as this operation.\n\t *\n\t * @returns {module:engine/model/operation/attributeoperation~AttributeOperation} Clone of this operation.\n\t */\n\tclone() {\n\t\treturn new AttributeOperation( this.range, this.key, this.oldValue, this.newValue, this.baseVersion );\n\t}\n\n\t/**\n\t * See {@link module:engine/model/operation/operation~Operation#getReversed `Operation#getReversed()`}.\n\t *\n\t * @returns {module:engine/model/operation/attributeoperation~AttributeOperation}\n\t */\n\tgetReversed() {\n\t\treturn new AttributeOperation( this.range, this.key, this.newValue, this.oldValue, this.baseVersion + 1 );\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\ttoJSON() {\n\t\tconst json = super.toJSON();\n\n\t\tjson.range = this.range.toJSON();\n\n\t\treturn json;\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\t_validate() {\n\t\tif ( !this.range.isFlat ) {\n\t\t\t/**\n\t\t\t * The range to change is not flat.\n\t\t\t *\n\t\t\t * @error attribute-operation-range-not-flat\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'attribute-operation-range-not-flat', this );\n\t\t}\n\n\t\tfor ( const item of this.range.getItems( { shallow: true } ) ) {\n\t\t\tif ( this.oldValue !== null && !isEqual( item.getAttribute( this.key ), this.oldValue ) ) {\n\t\t\t\t/**\n\t\t\t\t * Changed node has different attribute value than operation's old attribute value.\n\t\t\t\t *\n\t\t\t\t * @error attribute-operation-wrong-old-value\n\t\t\t\t * @param {module:engine/model/item~Item} item\n\t\t\t\t * @param {String} key\n\t\t\t\t * @param {*} value\n\t\t\t\t */\n\t\t\t\tthrow new CKEditorError(\n\t\t\t\t\t'attribute-operation-wrong-old-value',\n\t\t\t\t\tthis,\n\t\t\t\t\t{ item, key: this.key, value: this.oldValue }\n\t\t\t\t);\n\t\t\t}\n\n\t\t\tif ( this.oldValue === null && this.newValue !== null && item.hasAttribute( this.key ) ) {\n\t\t\t\t/**\n\t\t\t\t * The attribute with given key already exists for the given node.\n\t\t\t\t *\n\t\t\t\t * @error attribute-operation-attribute-exists\n\t\t\t\t * @param {module:engine/model/node~Node} node\n\t\t\t\t * @param {String} key\n\t\t\t\t */\n\t\t\t\tthrow new CKEditorError(\n\t\t\t\t\t'attribute-operation-attribute-exists',\n\t\t\t\t\tthis,\n\t\t\t\t\t{ node: item, key: this.key }\n\t\t\t\t);\n\t\t\t}\n\t\t}\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\t_execute() {\n\t\t// If value to set is same as old value, don't do anything.\n\t\tif ( !isEqual( this.oldValue, this.newValue ) ) {\n\t\t\t// Execution.\n\t\t\t_setAttribute( this.range, this.key, this.newValue );\n\t\t}\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tstatic get className() {\n\t\treturn 'AttributeOperation';\n\t}\n\n\t/**\n\t * Creates `AttributeOperation` object from deserilized object, i.e. from parsed JSON string.\n\t *\n\t * @param {Object} json Deserialized JSON object.\n\t * @param {module:engine/model/document~Document} document Document on which this operation will be applied.\n\t * @returns {module:engine/model/operation/attributeoperation~AttributeOperation}\n\t */\n\tstatic fromJSON( json, document ) {\n\t\treturn new AttributeOperation( Range.fromJSON( json.range, document ), json.key, json.oldValue, json.newValue, json.baseVersion );\n\t}\n\n\t// @if CK_DEBUG_ENGINE // toString() {\n\t// @if CK_DEBUG_ENGINE // \treturn `AttributeOperation( ${ this.baseVersion } ): ` +\n\t// @if CK_DEBUG_ENGINE //\t\t`\"${ this.key }\": ${ JSON.stringify( this.oldValue ) }` +\n\t// @if CK_DEBUG_ENGINE //\t\t` -> ${ JSON.stringify( this.newValue ) }, ${ this.range }`;\n\t// @if CK_DEBUG_ENGINE // }\n}\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module engine/model/operation/detachoperation\n */\n\nimport Operation from './operation';\nimport Range from '../range';\nimport { _remove } from './utils';\nimport CKEditorError from '@ckeditor/ckeditor5-utils/src/ckeditorerror';\n\n// @if CK_DEBUG_ENGINE // const ModelRange = require( '../range' ).default;\n\n/**\n * Operation to permanently remove node from detached root.\n * Note this operation is only a local operation and won't be send to the other clients.\n *\n * @extends module:engine/model/operation/operation~Operation\n */\nexport default class DetachOperation extends Operation {\n\t/**\n\t * Creates an insert operation.\n\t *\n\t * @param {module:engine/model/position~Position} sourcePosition\n\t * Position before the first {@link module:engine/model/item~Item model item} to move.\n\t * @param {Number} howMany Offset size of moved range. Moved range will start from `sourcePosition` and end at\n\t * `sourcePosition` with offset shifted by `howMany`.\n\t */\n\tconstructor( sourcePosition, howMany ) {\n\t\tsuper( null );\n\n\t\t/**\n\t\t * Position before the first {@link module:engine/model/item~Item model item} to detach.\n\t\t *\n\t\t * @member {module:engine/model/position~Position} #sourcePosition\n\t\t */\n\t\tthis.sourcePosition = sourcePosition.clone();\n\n\t\t/**\n\t\t * Offset size of moved range.\n\t\t *\n\t\t * @member {Number} #howMany\n\t\t */\n\t\tthis.howMany = howMany;\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tget type() {\n\t\treturn 'detach';\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\ttoJSON() {\n\t\tconst json = super.toJSON();\n\n\t\tjson.sourcePosition = this.sourcePosition.toJSON();\n\n\t\treturn json;\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\t_validate() {\n\t\tif ( this.sourcePosition.root.document ) {\n\t\t\t/**\n\t\t\t * Cannot detach document node.\n\t\t\t *\n\t\t\t * @error detach-operation-on-document-node\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'detach-operation-on-document-node', this );\n\t\t}\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\t_execute() {\n\t\t_remove( Range._createFromPositionAndShift( this.sourcePosition, this.howMany ) );\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tstatic get className() {\n\t\treturn 'DetachOperation';\n\t}\n\n\t// @if CK_DEBUG_ENGINE // toString() {\n\t// @if CK_DEBUG_ENGINE // const range = ModelRange._createFromPositionAndShift( this.sourcePosition, this.howMany );\n\t// @if CK_DEBUG_ENGINE //\tconst nodes = Array.from( range.getItems() );\n\t// @if CK_DEBUG_ENGINE //\tconst nodeString = nodes.length > 1 ? `[ ${ nodes.length } ]` : nodes[ 0 ];\n\n\t// @if CK_DEBUG_ENGINE //\treturn `DetachOperation( ${ this.baseVersion } ): ${ nodeString } -> ${ range }`;\n\t// @if CK_DEBUG_ENGINE // }\n}\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module engine/model/operation/moveoperation\n */\n\nimport Operation from './operation';\nimport Position from '../position';\nimport Range from '../range';\nimport CKEditorError from '@ckeditor/ckeditor5-utils/src/ckeditorerror';\nimport compareArrays from '@ckeditor/ckeditor5-utils/src/comparearrays';\nimport { _move } from './utils';\n\n// @if CK_DEBUG_ENGINE // const ModelRange = require( '../range' ).default;\n\n/**\n * Operation to move a range of {@link module:engine/model/item~Item model items}\n * to given {@link module:engine/model/position~Position target position}.\n *\n * @extends module:engine/model/operation/operation~Operation\n */\nexport default class MoveOperation extends Operation {\n\t/**\n\t * Creates a move operation.\n\t *\n\t * @param {module:engine/model/position~Position} sourcePosition\n\t * Position before the first {@link module:engine/model/item~Item model item} to move.\n\t * @param {Number} howMany Offset size of moved range. Moved range will start from `sourcePosition` and end at\n\t * `sourcePosition` with offset shifted by `howMany`.\n\t * @param {module:engine/model/position~Position} targetPosition Position at which moved nodes will be inserted.\n\t * @param {Number|null} baseVersion Document {@link module:engine/model/document~Document#version} on which operation\n\t * can be applied or `null` if the operation operates on detached (non-document) tree.\n\t */\n\tconstructor( sourcePosition, howMany, targetPosition, baseVersion ) {\n\t\tsuper( baseVersion );\n\n\t\t/**\n\t\t * Position before the first {@link module:engine/model/item~Item model item} to move.\n\t\t *\n\t\t * @member {module:engine/model/position~Position} module:engine/model/operation/moveoperation~MoveOperation#sourcePosition\n\t\t */\n\t\tthis.sourcePosition = sourcePosition.clone();\n\t\t// `'toNext'` because `sourcePosition` is a bit like a start of the moved range.\n\t\tthis.sourcePosition.stickiness = 'toNext';\n\n\t\t/**\n\t\t * Offset size of moved range.\n\t\t *\n\t\t * @member {Number} module:engine/model/operation/moveoperation~MoveOperation#howMany\n\t\t */\n\t\tthis.howMany = howMany;\n\n\t\t/**\n\t\t * Position at which moved nodes will be inserted.\n\t\t *\n\t\t * @member {module:engine/model/position~Position} module:engine/model/operation/moveoperation~MoveOperation#targetPosition\n\t\t */\n\t\tthis.targetPosition = targetPosition.clone();\n\t\tthis.targetPosition.stickiness = 'toNone';\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tget type() {\n\t\tif ( this.targetPosition.root.rootName == '$graveyard' ) {\n\t\t\treturn 'remove';\n\t\t} else if ( this.sourcePosition.root.rootName == '$graveyard' ) {\n\t\t\treturn 'reinsert';\n\t\t}\n\n\t\treturn 'move';\n\t}\n\n\t/**\n\t * Creates and returns an operation that has the same parameters as this operation.\n\t *\n\t * @returns {module:engine/model/operation/moveoperation~MoveOperation} Clone of this operation.\n\t */\n\tclone() {\n\t\treturn new this.constructor( this.sourcePosition, this.howMany, this.targetPosition, this.baseVersion );\n\t}\n\n\t/**\n\t * Returns the start position of the moved range after it got moved. This may be different than\n\t * {@link module:engine/model/operation/moveoperation~MoveOperation#targetPosition} in some cases, i.e. when a range is moved\n\t * inside the same parent but {@link module:engine/model/operation/moveoperation~MoveOperation#targetPosition targetPosition}\n\t * is after {@link module:engine/model/operation/moveoperation~MoveOperation#sourcePosition sourcePosition}.\n\t *\n\t *\t\t vv              vv\n\t *\t\tabcdefg ===> adefbcg\n\t *\t\t     ^          ^\n\t *\t\t     targetPos\tmovedRangeStart\n\t *\t\t     offset 6\toffset 4\n\t *\n\t * @returns {module:engine/model/position~Position}\n\t */\n\tgetMovedRangeStart() {\n\t\treturn this.targetPosition._getTransformedByDeletion( this.sourcePosition, this.howMany );\n\t}\n\n\t/**\n\t * See {@link module:engine/model/operation/operation~Operation#getReversed `Operation#getReversed()`}.\n\t *\n\t * @returns {module:engine/model/operation/moveoperation~MoveOperation}\n\t */\n\tgetReversed() {\n\t\tconst newTargetPosition = this.sourcePosition._getTransformedByInsertion( this.targetPosition, this.howMany );\n\n\t\treturn new this.constructor( this.getMovedRangeStart(), this.howMany, newTargetPosition, this.baseVersion + 1 );\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\t_validate() {\n\t\tconst sourceElement = this.sourcePosition.parent;\n\t\tconst targetElement = this.targetPosition.parent;\n\t\tconst sourceOffset = this.sourcePosition.offset;\n\t\tconst targetOffset = this.targetPosition.offset;\n\n\t\t// Validate whether move operation has correct parameters.\n\t\t// Validation is pretty complex but move operation is one of the core ways to manipulate the document state.\n\t\t// We expect that many errors might be connected with one of scenarios described below.\n\t\tif ( sourceOffset + this.howMany > sourceElement.maxOffset ) {\n\t\t\t/**\n\t\t\t * The nodes which should be moved do not exist.\n\t\t\t *\n\t\t\t * @error move-operation-nodes-do-not-exist\n\t\t\t */\n\t\t\tthrow new CKEditorError(\n\t\t\t\t'move-operation-nodes-do-not-exist', this\n\t\t\t);\n\t\t} else if ( sourceElement === targetElement && sourceOffset < targetOffset && targetOffset < sourceOffset + this.howMany ) {\n\t\t\t/**\n\t\t\t * Trying to move a range of nodes into the middle of that range.\n\t\t\t *\n\t\t\t * @error move-operation-range-into-itself\n\t\t\t */\n\t\t\tthrow new CKEditorError(\n\t\t\t\t'move-operation-range-into-itself', this\n\t\t\t);\n\t\t} else if ( this.sourcePosition.root == this.targetPosition.root ) {\n\t\t\tif ( compareArrays( this.sourcePosition.getParentPath(), this.targetPosition.getParentPath() ) == 'prefix' ) {\n\t\t\t\tconst i = this.sourcePosition.path.length - 1;\n\n\t\t\t\tif ( this.targetPosition.path[ i ] >= sourceOffset && this.targetPosition.path[ i ] < sourceOffset + this.howMany ) {\n\t\t\t\t\t/**\n\t\t\t\t\t * Trying to move a range of nodes into one of nodes from that range.\n\t\t\t\t\t *\n\t\t\t\t\t * @error move-operation-node-into-itself\n\t\t\t\t\t */\n\t\t\t\t\tthrow new CKEditorError(\n\t\t\t\t\t\t'move-operation-node-into-itself', this\n\t\t\t\t\t);\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\t_execute() {\n\t\t_move( Range._createFromPositionAndShift( this.sourcePosition, this.howMany ), this.targetPosition );\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\ttoJSON() {\n\t\tconst json = super.toJSON();\n\n\t\tjson.sourcePosition = this.sourcePosition.toJSON();\n\t\tjson.targetPosition = this.targetPosition.toJSON();\n\n\t\treturn json;\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tstatic get className() {\n\t\treturn 'MoveOperation';\n\t}\n\n\t/**\n\t * Creates `MoveOperation` object from deserilized object, i.e. from parsed JSON string.\n\t *\n\t * @param {Object} json Deserialized JSON object.\n\t * @param {module:engine/model/document~Document} document Document on which this operation will be applied.\n\t * @returns {module:engine/model/operation/moveoperation~MoveOperation}\n\t */\n\tstatic fromJSON( json, document ) {\n\t\tconst sourcePosition = Position.fromJSON( json.sourcePosition, document );\n\t\tconst targetPosition = Position.fromJSON( json.targetPosition, document );\n\n\t\treturn new this( sourcePosition, json.howMany, targetPosition, json.baseVersion );\n\t}\n\n\t// @if CK_DEBUG_ENGINE // toString() {\n\t// @if CK_DEBUG_ENGINE // \tconst range = ModelRange._createFromPositionAndShift( this.sourcePosition, this.howMany );\n\n\t// @if CK_DEBUG_ENGINE //\treturn `MoveOperation( ${ this.baseVersion } ): ${ range } -> ${ this.targetPosition }`;\n\t// @if CK_DEBUG_ENGINE // }\n}\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module engine/model/operation/insertoperation\n */\n\nimport Operation from './operation';\nimport Position from '../position';\nimport NodeList from '../nodelist';\nimport MoveOperation from './moveoperation';\nimport { _insert, _normalizeNodes } from './utils';\nimport Text from '../text';\nimport Element from '../element';\nimport CKEditorError from '@ckeditor/ckeditor5-utils/src/ckeditorerror';\n\n/**\n * Operation to insert one or more nodes at given position in the model.\n *\n * @extends module:engine/model/operation/operation~Operation\n */\nexport default class InsertOperation extends Operation {\n\t/**\n\t * Creates an insert operation.\n\t *\n\t * @param {module:engine/model/position~Position} position Position of insertion.\n\t * @param {module:engine/model/node~NodeSet} nodes The list of nodes to be inserted.\n\t * @param {Number|null} baseVersion Document {@link module:engine/model/document~Document#version} on which operation\n\t * can be applied or `null` if the operation operates on detached (non-document) tree.\n\t */\n\tconstructor( position, nodes, baseVersion ) {\n\t\tsuper( baseVersion );\n\n\t\t/**\n\t\t * Position of insertion.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:engine/model/position~Position} module:engine/model/operation/insertoperation~InsertOperation#position\n\t\t */\n\t\tthis.position = position.clone();\n\t\tthis.position.stickiness = 'toNone';\n\n\t\t/**\n\t\t * List of nodes to insert.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:engine/model/nodelist~NodeList} module:engine/model/operation/insertoperation~InsertOperation#nodeList\n\t\t */\n\t\tthis.nodes = new NodeList( _normalizeNodes( nodes ) );\n\n\t\t/**\n\t\t * Flag deciding how the operation should be transformed. If set to `true`, nodes might get additional attributes\n\t\t * during operational transformation. This happens when the operation insertion position is inside of a range\n\t\t * where attributes have changed.\n\t\t *\n\t\t * @member {Boolean} module:engine/model/operation/insertoperation~InsertOperation#shouldReceiveAttributes\n\t\t */\n\t\tthis.shouldReceiveAttributes = false;\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tget type() {\n\t\treturn 'insert';\n\t}\n\n\t/**\n\t * Total offset size of inserted nodes.\n\t *\n\t * @returns {Number}\n\t */\n\tget howMany() {\n\t\treturn this.nodes.maxOffset;\n\t}\n\n\t/**\n\t * Creates and returns an operation that has the same parameters as this operation.\n\t *\n\t * @returns {module:engine/model/operation/insertoperation~InsertOperation} Clone of this operation.\n\t */\n\tclone() {\n\t\tconst nodes = new NodeList( [ ...this.nodes ].map( node => node._clone( true ) ) );\n\t\tconst insert = new InsertOperation( this.position, nodes, this.baseVersion );\n\n\t\tinsert.shouldReceiveAttributes = this.shouldReceiveAttributes;\n\n\t\treturn insert;\n\t}\n\n\t/**\n\t * See {@link module:engine/model/operation/operation~Operation#getReversed `Operation#getReversed()`}.\n\t *\n\t * @returns {module:engine/model/operation/moveoperation~MoveOperation}\n\t */\n\tgetReversed() {\n\t\tconst graveyard = this.position.root.document.graveyard;\n\t\tconst gyPosition = new Position( graveyard, [ 0 ] );\n\n\t\treturn new MoveOperation( this.position, this.nodes.maxOffset, gyPosition, this.baseVersion + 1 );\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\t_validate() {\n\t\tconst targetElement = this.position.parent;\n\n\t\tif ( !targetElement || targetElement.maxOffset < this.position.offset ) {\n\t\t\t/**\n\t\t\t * Insertion position is invalid.\n\t\t\t *\n\t\t\t * @error insert-operation-position-invalid\n\t\t\t */\n\t\t\tthrow new CKEditorError(\n\t\t\t\t'insert-operation-position-invalid',\n\t\t\t\tthis\n\t\t\t);\n\t\t}\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\t_execute() {\n\t\t// What happens here is that we want original nodes be passed to writer because we want original nodes\n\t\t// to be inserted to the model. But in InsertOperation, we want to keep those nodes as they were added\n\t\t// to the operation, not modified. For example, text nodes can get merged or cropped while Elements can\n\t\t// get children. It is important that InsertOperation has the copy of original nodes in intact state.\n\t\tconst originalNodes = this.nodes;\n\t\tthis.nodes = new NodeList( [ ...originalNodes ].map( node => node._clone( true ) ) );\n\n\t\t_insert( this.position, originalNodes );\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\ttoJSON() {\n\t\tconst json = super.toJSON();\n\n\t\tjson.position = this.position.toJSON();\n\t\tjson.nodes = this.nodes.toJSON();\n\n\t\treturn json;\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tstatic get className() {\n\t\treturn 'InsertOperation';\n\t}\n\n\t/**\n\t * Creates `InsertOperation` object from deserilized object, i.e. from parsed JSON string.\n\t *\n\t * @param {Object} json Deserialized JSON object.\n\t * @param {module:engine/model/document~Document} document Document on which this operation will be applied.\n\t * @returns {module:engine/model/operation/insertoperation~InsertOperation}\n\t */\n\tstatic fromJSON( json, document ) {\n\t\tconst children = [];\n\n\t\tfor ( const child of json.nodes ) {\n\t\t\tif ( child.name ) {\n\t\t\t\t// If child has name property, it is an Element.\n\t\t\t\tchildren.push( Element.fromJSON( child ) );\n\t\t\t} else {\n\t\t\t\t// Otherwise, it is a Text node.\n\t\t\t\tchildren.push( Text.fromJSON( child ) );\n\t\t\t}\n\t\t}\n\n\t\tconst insert = new InsertOperation( Position.fromJSON( json.position, document ), children, json.baseVersion );\n\t\tinsert.shouldReceiveAttributes = json.shouldReceiveAttributes;\n\n\t\treturn insert;\n\t}\n\n\t// @if CK_DEBUG_ENGINE // toString() {\n\t// @if CK_DEBUG_ENGINE // \tconst nodeString = this.nodes.length > 1 ? `[ ${ this.nodes.length } ]` : this.nodes.getNode( 0 );\n\n\t// @if CK_DEBUG_ENGINE //\treturn `InsertOperation( ${ this.baseVersion } ): ${ nodeString } -> ${ this.position }`;\n\t// @if CK_DEBUG_ENGINE // }\n}\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module engine/model/operation/markeroperation\n */\n\nimport Operation from './operation';\nimport Range from '../range';\n\n/**\n * @extends module:engine/model/operation/operation~Operation\n */\nexport default class MarkerOperation extends Operation {\n\t/**\n\t * @param {String} name Marker name.\n\t * @param {module:engine/model/range~Range} oldRange Marker range before the change.\n\t * @param {module:engine/model/range~Range} newRange Marker range after the change.\n\t * @param {module:engine/model/markercollection~MarkerCollection} markers Marker collection on which change should be executed.\n\t * @param {Boolean} affectsData Specifies whether the marker operation affects the data produced by the data pipeline\n\t * (is persisted in the editor's data).\n\t * @param {Number|null} baseVersion Document {@link module:engine/model/document~Document#version} on which operation\n\t * can be applied or `null` if the operation operates on detached (non-document) tree.\n\t */\n\tconstructor( name, oldRange, newRange, markers, affectsData, baseVersion ) {\n\t\tsuper( baseVersion );\n\n\t\t/**\n\t\t * Marker name.\n\t\t *\n\t\t * @readonly\n\t\t * @member {String}\n\t\t */\n\t\tthis.name = name;\n\n\t\t/**\n\t\t * Marker range before the change.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:engine/model/range~Range}\n\t\t */\n\t\tthis.oldRange = oldRange ? oldRange.clone() : null;\n\n\t\t/**\n\t\t * Marker range after the change.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:engine/model/range~Range}\n\t\t */\n\t\tthis.newRange = newRange ? newRange.clone() : null;\n\n\t\t/**\n\t\t * Specifies whether the marker operation affects the data produced by the data pipeline\n\t\t * (is persisted in the editor's data).\n\t\t *\n\t\t * @readonly\n\t\t * @member {Boolean}\n\t\t */\n\t\tthis.affectsData = affectsData;\n\n\t\t/**\n\t\t * Marker collection on which change should be executed.\n\t\t *\n\t\t * @private\n\t\t * @member {module:engine/model/markercollection~MarkerCollection}\n\t\t */\n\t\tthis._markers = markers;\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tget type() {\n\t\treturn 'marker';\n\t}\n\n\t/**\n\t * Creates and returns an operation that has the same parameters as this operation.\n\t *\n\t * @returns {module:engine/model/operation/markeroperation~MarkerOperation} Clone of this operation.\n\t */\n\tclone() {\n\t\treturn new MarkerOperation( this.name, this.oldRange, this.newRange, this._markers, this.affectsData, this.baseVersion );\n\t}\n\n\t/**\n\t * See {@link module:engine/model/operation/operation~Operation#getReversed `Operation#getReversed()`}.\n\t *\n\t * @returns {module:engine/model/operation/markeroperation~MarkerOperation}\n\t */\n\tgetReversed() {\n\t\treturn new MarkerOperation( this.name, this.newRange, this.oldRange, this._markers, this.affectsData, this.baseVersion + 1 );\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\t_execute() {\n\t\tconst type = this.newRange ? '_set' : '_remove';\n\n\t\tthis._markers[ type ]( this.name, this.newRange, true, this.affectsData );\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\ttoJSON() {\n\t\tconst json = super.toJSON();\n\n\t\tif ( this.oldRange ) {\n\t\t\tjson.oldRange = this.oldRange.toJSON();\n\t\t}\n\n\t\tif ( this.newRange ) {\n\t\t\tjson.newRange = this.newRange.toJSON();\n\t\t}\n\n\t\tdelete json._markers;\n\n\t\treturn json;\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tstatic get className() {\n\t\treturn 'MarkerOperation';\n\t}\n\n\t/**\n\t * Creates `MarkerOperation` object from deserialized object, i.e. from parsed JSON string.\n\t *\n\t * @param {Object} json Deserialized JSON object.\n\t * @param {module:engine/model/document~Document} document Document on which this operation will be applied.\n\t * @returns {module:engine/model/operation/markeroperation~MarkerOperation}\n\t */\n\tstatic fromJSON( json, document ) {\n\t\treturn new MarkerOperation(\n\t\t\tjson.name,\n\t\t\tjson.oldRange ? Range.fromJSON( json.oldRange, document ) : null,\n\t\t\tjson.newRange ? Range.fromJSON( json.newRange, document ) : null,\n\t\t\tdocument.model.markers,\n\t\t\tjson.affectsData,\n\t\t\tjson.baseVersion\n\t\t);\n\t}\n\n\t// @if CK_DEBUG_ENGINE // toString() {\n\t// @if CK_DEBUG_ENGINE // \treturn `MarkerOperation( ${ this.baseVersion } ): ` +\n\t// @if CK_DEBUG_ENGINE //\t\t`\"${ this.name }\": ${ this.oldRange } -> ${ this.newRange }`;\n\t// @if CK_DEBUG_ENGINE // }\n}\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module engine/model/operation/renameoperation\n */\n\nimport Operation from './operation';\nimport Element from '../element';\nimport CKEditorError from '@ckeditor/ckeditor5-utils/src/ckeditorerror';\nimport Position from '../position';\n\n/**\n * Operation to change element's name.\n *\n * Using this class you can change element's name.\n *\n * @extends module:engine/model/operation/operation~Operation\n */\nexport default class RenameOperation extends Operation {\n\t/**\n\t * Creates an operation that changes element's name.\n\t *\n\t * @param {module:engine/model/position~Position} position Position before an element to change.\n\t * @param {String} oldName Current name of the element.\n\t * @param {String} newName New name for the element.\n\t * @param {Number|null} baseVersion Document {@link module:engine/model/document~Document#version} on which operation\n\t * can be applied or `null` if the operation operates on detached (non-document) tree.\n\t */\n\tconstructor( position, oldName, newName, baseVersion ) {\n\t\tsuper( baseVersion );\n\n\t\t/**\n\t\t * Position before an element to change.\n\t\t *\n\t\t * @member {module:engine/model/position~Position} module:engine/model/operation/renameoperation~RenameOperation#position\n\t\t */\n\t\tthis.position = position;\n\t\t// This position sticks to the next node because it is a position before the node that we want to change.\n\t\tthis.position.stickiness = 'toNext';\n\n\t\t/**\n\t\t * Current name of the element.\n\t\t *\n\t\t * @member {String} module:engine/model/operation/renameoperation~RenameOperation#oldName\n\t\t */\n\t\tthis.oldName = oldName;\n\n\t\t/**\n\t\t * New name for the element.\n\t\t *\n\t\t * @member {String} module:engine/model/operation/renameoperation~RenameOperation#newName\n\t\t */\n\t\tthis.newName = newName;\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tget type() {\n\t\treturn 'rename';\n\t}\n\n\t/**\n\t * Creates and returns an operation that has the same parameters as this operation.\n\t *\n\t * @returns {module:engine/model/operation/renameoperation~RenameOperation} Clone of this operation.\n\t */\n\tclone() {\n\t\treturn new RenameOperation( this.position.clone(), this.oldName, this.newName, this.baseVersion );\n\t}\n\n\t/**\n\t * See {@link module:engine/model/operation/operation~Operation#getReversed `Operation#getReversed()`}.\n\t *\n\t * @returns {module:engine/model/operation/renameoperation~RenameOperation}\n\t */\n\tgetReversed() {\n\t\treturn new RenameOperation( this.position.clone(), this.newName, this.oldName, this.baseVersion + 1 );\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\t_validate() {\n\t\tconst element = this.position.nodeAfter;\n\n\t\tif ( !( element instanceof Element ) ) {\n\t\t\t/**\n\t\t\t * Given position is invalid or node after it is not instance of Element.\n\t\t\t *\n\t\t\t * @error rename-operation-wrong-position\n\t\t\t */\n\t\t\tthrow new CKEditorError(\n\t\t\t\t'rename-operation-wrong-position',\n\t\t\t\tthis\n\t\t\t);\n\t\t} else if ( element.name !== this.oldName ) {\n\t\t\t/**\n\t\t\t * Element to change has different name than operation's old name.\n\t\t\t *\n\t\t\t * @error rename-operation-wrong-name\n\t\t\t */\n\t\t\tthrow new CKEditorError(\n\t\t\t\t'rename-operation-wrong-name',\n\t\t\t\tthis\n\t\t\t);\n\t\t}\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\t_execute() {\n\t\tconst element = this.position.nodeAfter;\n\n\t\telement.name = this.newName;\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\ttoJSON() {\n\t\tconst json = super.toJSON();\n\n\t\tjson.position = this.position.toJSON();\n\n\t\treturn json;\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tstatic get className() {\n\t\treturn 'RenameOperation';\n\t}\n\n\t/**\n\t * Creates `RenameOperation` object from deserialized object, i.e. from parsed JSON string.\n\t *\n\t * @param {Object} json Deserialized JSON object.\n\t * @param {module:engine/model/document~Document} document Document on which this operation will be applied.\n\t * @returns {module:engine/model/operation/attributeoperation~AttributeOperation}\n\t */\n\tstatic fromJSON( json, document ) {\n\t\treturn new RenameOperation( Position.fromJSON( json.position, document ), json.oldName, json.newName, json.baseVersion );\n\t}\n\n\t// @if CK_DEBUG_ENGINE // toString() {\n\t// @if CK_DEBUG_ENGINE // \treturn `RenameOperation( ${ this.baseVersion } ): ` +\n\t// @if CK_DEBUG_ENGINE //\t\t`${ this.position }: \"${ this.oldName }\" -> \"${ this.newName }\"`;\n\t// @if CK_DEBUG_ENGINE // }\n}\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module engine/model/operation/rootattributeoperation\n */\n\nimport Operation from './operation';\nimport CKEditorError from '@ckeditor/ckeditor5-utils/src/ckeditorerror';\n\n/**\n * Operation to change root element's attribute. Using this class you can add, remove or change value of the attribute.\n *\n * This operation is needed, because root elements can't be changed through\n * @link module:engine/model/operation/attributeoperation~AttributeOperation}.\n * It is because {@link module:engine/model/operation/attributeoperation~AttributeOperation}\n * requires a range to change and root element can't\n * be a part of range because every {@link module:engine/model/position~Position} has to be inside a root.\n * {@link module:engine/model/position~Position} can't be created before a root element.\n *\n * @extends module:engine/model/operation/operation~Operation\n */\nexport default class RootAttributeOperation extends Operation {\n\t/**\n\t * Creates an operation that changes, removes or adds attributes on root element.\n\t *\n\t * @see module:engine/model/operation/attributeoperation~AttributeOperation\n\t * @param {module:engine/model/rootelement~RootElement} root Root element to change.\n\t * @param {String} key Key of an attribute to change or remove.\n\t * @param {*} oldValue Old value of the attribute with given key or `null` if adding a new attribute.\n\t * @param {*} newValue New value to set for the attribute. If `null`, then the operation just removes the attribute.\n\t * @param {Number|null} baseVersion Document {@link module:engine/model/document~Document#version} on which operation\n\t * can be applied or `null` if the operation operates on detached (non-document) tree.\n\t */\n\tconstructor( root, key, oldValue, newValue, baseVersion ) {\n\t\tsuper( baseVersion );\n\n\t\t/**\n\t\t * Root element to change.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:engine/model/rootelement~RootElement}\n\t\t */\n\t\tthis.root = root;\n\n\t\t/**\n\t\t * Key of an attribute to change or remove.\n\t\t *\n\t\t * @readonly\n\t\t * @member {String}\n\t\t */\n\t\tthis.key = key;\n\n\t\t/**\n\t\t * Old value of the attribute with given key or `null` if adding a new attribute.\n\t\t *\n\t\t * @readonly\n\t\t * @member {*}\n\t\t */\n\t\tthis.oldValue = oldValue;\n\n\t\t/**\n\t\t * New value to set for the attribute. If `null`, then the operation just removes the attribute.\n\t\t *\n\t\t * @readonly\n\t\t * @member {*}\n\t\t */\n\t\tthis.newValue = newValue;\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tget type() {\n\t\tif ( this.oldValue === null ) {\n\t\t\treturn 'addRootAttribute';\n\t\t} else if ( this.newValue === null ) {\n\t\t\treturn 'removeRootAttribute';\n\t\t} else {\n\t\t\treturn 'changeRootAttribute';\n\t\t}\n\t}\n\n\t/**\n\t * Creates and returns an operation that has the same parameters as this operation.\n\t *\n\t * @returns {module:engine/model/operation/rootattributeoperation~RootAttributeOperation} Clone of this operation.\n\t */\n\tclone() {\n\t\treturn new RootAttributeOperation( this.root, this.key, this.oldValue, this.newValue, this.baseVersion );\n\t}\n\n\t/**\n\t * See {@link module:engine/model/operation/operation~Operation#getReversed `Operation#getReversed()`}.\n\t *\n\t * @returns {module:engine/model/operation/rootattributeoperation~RootAttributeOperation}\n\t */\n\tgetReversed() {\n\t\treturn new RootAttributeOperation( this.root, this.key, this.newValue, this.oldValue, this.baseVersion + 1 );\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\t_validate() {\n\t\tif ( this.root != this.root.root || this.root.is( 'documentFragment' ) ) {\n\t\t\t/**\n\t\t\t * The element to change is not a root element.\n\t\t\t *\n\t\t\t * @error rootattribute-operation-not-a-root\n\t\t\t * @param {module:engine/model/rootelement~RootElement} root\n\t\t\t * @param {String} key\n\t\t\t * @param {*} value\n\t\t\t */\n\t\t\tthrow new CKEditorError(\n\t\t\t\t'rootattribute-operation-not-a-root',\n\t\t\t\tthis,\n\t\t\t\t{ root: this.root, key: this.key }\n\t\t\t);\n\t\t}\n\n\t\tif ( this.oldValue !== null && this.root.getAttribute( this.key ) !== this.oldValue ) {\n\t\t\t/**\n\t\t\t * The attribute which should be removed does not exists for the given node.\n\t\t\t *\n\t\t\t * @error rootattribute-operation-wrong-old-value\n\t\t\t * @param {module:engine/model/rootelement~RootElement} root\n\t\t\t * @param {String} key\n\t\t\t * @param {*} value\n\t\t\t */\n\t\t\tthrow new CKEditorError(\n\t\t\t\t'rootattribute-operation-wrong-old-value',\n\t\t\t\tthis,\n\t\t\t\t{ root: this.root, key: this.key }\n\t\t\t);\n\t\t}\n\n\t\tif ( this.oldValue === null && this.newValue !== null && this.root.hasAttribute( this.key ) ) {\n\t\t\t/**\n\t\t\t * The attribute with given key already exists for the given node.\n\t\t\t *\n\t\t\t * @error rootattribute-operation-attribute-exists\n\t\t\t * @param {module:engine/model/rootelement~RootElement} root\n\t\t\t * @param {String} key\n\t\t\t */\n\t\t\tthrow new CKEditorError(\n\t\t\t\t'rootattribute-operation-attribute-exists',\n\t\t\t\tthis,\n\t\t\t\t{ root: this.root, key: this.key }\n\t\t\t);\n\t\t}\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\t_execute() {\n\t\tif ( this.newValue !== null ) {\n\t\t\tthis.root._setAttribute( this.key, this.newValue );\n\t\t} else {\n\t\t\tthis.root._removeAttribute( this.key );\n\t\t}\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\ttoJSON() {\n\t\tconst json = super.toJSON();\n\n\t\tjson.root = this.root.toJSON();\n\n\t\treturn json;\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tstatic get className() {\n\t\treturn 'RootAttributeOperation';\n\t}\n\n\t/**\n\t * Creates RootAttributeOperation object from deserilized object, i.e. from parsed JSON string.\n\t *\n\t * @param {Object} json Deserialized JSON object.\n\t * @param {module:engine/model/document~Document} document Document on which this operation will be applied.\n\t * @returns {module:engine/model/operation/rootattributeoperation~RootAttributeOperation}\n\t */\n\tstatic fromJSON( json, document ) {\n\t\tif ( !document.getRoot( json.root ) ) {\n\t\t\t/**\n\t\t\t * Cannot create RootAttributeOperation for document. Root with specified name does not exist.\n\t\t\t *\n\t\t\t * @error rootattribute-operation-fromjson-no-root\n\t\t\t * @param {String} rootName\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'rootattribute-operation-fromjson-no-root', this, { rootName: json.root } );\n\t\t}\n\n\t\treturn new RootAttributeOperation( document.getRoot( json.root ), json.key, json.oldValue, json.newValue, json.baseVersion );\n\t}\n\n\t// @if CK_DEBUG_ENGINE // toString() {\n\t// @if CK_DEBUG_ENGINE // \treturn `RootAttributeOperation( ${ this.baseVersion } ): ` +\n\t// @if CK_DEBUG_ENGINE //\t\t`\"${ this.key }\": ${ JSON.stringify( this.oldValue ) }` +\n\t// @if CK_DEBUG_ENGINE //\t\t` -> ${ JSON.stringify( this.newValue ) }, ${ this.root.rootName }`;\n\t// @if CK_DEBUG_ENGINE // }\n}\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module engine/model/operation/mergeoperation\n */\n\nimport Operation from './operation';\nimport SplitOperation from './splitoperation';\nimport Position from '../position';\nimport Range from '../range';\nimport { _move } from './utils';\n\nimport CKEditorError from '@ckeditor/ckeditor5-utils/src/ckeditorerror';\n\n/**\n * Operation to merge two {@link module:engine/model/element~Element elements}.\n *\n * The merged element is the parent of {@link ~MergeOperation#sourcePosition} and it is merged into the parent of\n * {@link ~MergeOperation#targetPosition}. All nodes from the merged element are moved to {@link ~MergeOperation#targetPosition}.\n *\n * The merged element is moved to the graveyard at {@link ~MergeOperation#graveyardPosition}.\n *\n * @extends module:engine/model/operation/operation~Operation\n */\nexport default class MergeOperation extends Operation {\n\t/**\n\t * Creates a merge operation.\n\t *\n\t * @param {module:engine/model/position~Position} sourcePosition Position inside the merged element. All nodes from that\n\t * element after that position will be moved to {@link ~#targetPosition}.\n\t * @param {Number} howMany Summary offset size of nodes which will be moved from the merged element to the new parent.\n\t * @param {module:engine/model/position~Position} targetPosition Position which the nodes from the merged elements will be moved to.\n\t * @param {module:engine/model/position~Position} graveyardPosition Position in graveyard to which the merged element will be moved.\n\t * @param {Number|null} baseVersion Document {@link module:engine/model/document~Document#version} on which operation\n\t * can be applied or `null` if the operation operates on detached (non-document) tree.\n\t */\n\tconstructor( sourcePosition, howMany, targetPosition, graveyardPosition, baseVersion ) {\n\t\tsuper( baseVersion );\n\n\t\t/**\n\t\t * Position inside the merged element. All nodes from that element after that position will be moved to {@link ~#targetPosition}.\n\t\t *\n\t\t * @member {module:engine/model/position~Position} module:engine/model/operation/mergeoperation~MergeOperation#sourcePosition\n\t\t */\n\t\tthis.sourcePosition = sourcePosition.clone();\n\t\t// This is, and should always remain, the first position in its parent.\n\t\tthis.sourcePosition.stickiness = 'toPrevious';\n\n\t\t/**\n\t\t * Summary offset size of nodes which will be moved from the merged element to the new parent.\n\t\t *\n\t\t * @member {Number} module:engine/model/operation/mergeoperation~MergeOperation#howMany\n\t\t */\n\t\tthis.howMany = howMany;\n\n\t\t/**\n\t\t * Position which the nodes from the merged elements will be moved to.\n\t\t *\n\t\t * @member {module:engine/model/position~Position} module:engine/model/operation/mergeoperation~MergeOperation#targetPosition\n\t\t */\n\t\tthis.targetPosition = targetPosition.clone();\n\t\t// Except of a rare scenario in `MergeOperation` x `MergeOperation` transformation,\n\t\t// this is, and should always remain, the last position in its parent.\n\t\tthis.targetPosition.stickiness = 'toNext';\n\n\t\t/**\n\t\t * Position in graveyard to which the merged element will be moved.\n\t\t *\n\t\t * @member {module:engine/model/position~Position} module:engine/model/operation/mergeoperation~MergeOperation#graveyardPosition\n\t\t */\n\t\tthis.graveyardPosition = graveyardPosition.clone();\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tget type() {\n\t\treturn 'merge';\n\t}\n\n\t/**\n\t * Position before the merged element (which will be deleted).\n\t *\n\t * @readonly\n\t * @type {module:engine/model/position~Position}\n\t */\n\tget deletionPosition() {\n\t\treturn new Position( this.sourcePosition.root, this.sourcePosition.path.slice( 0, -1 ) );\n\t}\n\n\t/**\n\t * Artificial range that contains all the nodes from the merged element that will be moved to {@link ~MergeOperation#sourcePosition}.\n\t * The range starts at {@link ~MergeOperation#sourcePosition} and ends in the same parent, at `POSITIVE_INFINITY` offset.\n\t *\n\t * @readonly\n\t * @type {module:engine/model/range~Range}\n\t */\n\tget movedRange() {\n\t\tconst end = this.sourcePosition.getShiftedBy( Number.POSITIVE_INFINITY );\n\n\t\treturn new Range( this.sourcePosition, end );\n\t}\n\n\t/**\n\t * Creates and returns an operation that has the same parameters as this operation.\n\t *\n\t * @returns {module:engine/model/operation/mergeoperation~MergeOperation} Clone of this operation.\n\t */\n\tclone() {\n\t\treturn new this.constructor( this.sourcePosition, this.howMany, this.targetPosition, this.graveyardPosition, this.baseVersion );\n\t}\n\n\t/**\n\t * See {@link module:engine/model/operation/operation~Operation#getReversed `Operation#getReversed()`}.\n\t *\n\t * @returns {module:engine/model/operation/splitoperation~SplitOperation}\n\t */\n\tgetReversed() {\n\t\t// Positions in this method are transformed by this merge operation because the split operation bases on\n\t\t// the context after this merge operation happened (because split operation reverses it).\n\t\t// So we need to acknowledge that the merge operation happened and those positions changed a little.\n\t\tconst targetPosition = this.targetPosition._getTransformedByMergeOperation( this );\n\n\t\tconst path = this.sourcePosition.path.slice( 0, -1 );\n\t\tconst insertionPosition = new Position( this.sourcePosition.root, path )._getTransformedByMergeOperation( this );\n\n\t\tconst split = new SplitOperation( targetPosition, this.howMany, this.graveyardPosition, this.baseVersion + 1 );\n\t\tsplit.insertionPosition = insertionPosition;\n\n\t\treturn split;\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\t_validate() {\n\t\tconst sourceElement = this.sourcePosition.parent;\n\t\tconst targetElement = this.targetPosition.parent;\n\n\t\t// Validate whether merge operation has correct parameters.\n\t\tif ( !sourceElement.parent ) {\n\t\t\t/**\n\t\t\t * Merge source position is invalid. The element to be merged must have a parent node.\n\t\t\t *\n\t\t\t * @error merge-operation-source-position-invalid\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'merge-operation-source-position-invalid', this );\n\t\t} else if ( !targetElement.parent ) {\n\t\t\t/**\n\t\t\t * Merge target position is invalid. The element to be merged must have a parent node.\n\t\t\t *\n\t\t\t * @error merge-operation-target-position-invalid\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'merge-operation-target-position-invalid', this );\n\t\t} else if ( this.howMany != sourceElement.maxOffset ) {\n\t\t\t/**\n\t\t\t * Merge operation specifies wrong number of nodes to move.\n\t\t\t *\n\t\t\t * @error merge-operation-how-many-invalid\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'merge-operation-how-many-invalid', this );\n\t\t}\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\t_execute() {\n\t\tconst mergedElement = this.sourcePosition.parent;\n\t\tconst sourceRange = Range._createIn( mergedElement );\n\n\t\t_move( sourceRange, this.targetPosition );\n\t\t_move( Range._createOn( mergedElement ), this.graveyardPosition );\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\ttoJSON() {\n\t\tconst json = super.toJSON();\n\n\t\tjson.sourcePosition = json.sourcePosition.toJSON();\n\t\tjson.targetPosition = json.targetPosition.toJSON();\n\t\tjson.graveyardPosition = json.graveyardPosition.toJSON();\n\n\t\treturn json;\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tstatic get className() {\n\t\treturn 'MergeOperation';\n\t}\n\n\t/**\n\t * Creates `MergeOperation` object from deserilized object, i.e. from parsed JSON string.\n\t *\n\t * @param {Object} json Deserialized JSON object.\n\t * @param {module:engine/model/document~Document} document Document on which this operation will be applied.\n\t * @returns {module:engine/model/operation/mergeoperation~MergeOperation}\n\t */\n\tstatic fromJSON( json, document ) {\n\t\tconst sourcePosition = Position.fromJSON( json.sourcePosition, document );\n\t\tconst targetPosition = Position.fromJSON( json.targetPosition, document );\n\t\tconst graveyardPosition = Position.fromJSON( json.graveyardPosition, document );\n\n\t\treturn new this( sourcePosition, json.howMany, targetPosition, graveyardPosition, json.baseVersion );\n\t}\n\n\t// @if CK_DEBUG_ENGINE // toString() {\n\t// @if CK_DEBUG_ENGINE // \treturn `MergeOperation( ${ this.baseVersion } ): ` +\n\t// @if CK_DEBUG_ENGINE //\t\t`${ this.sourcePosition } -> ${ this.targetPosition }` +\n\t// @if CK_DEBUG_ENGINE //\t\t` ( ${ this.howMany } ), ${ this.graveyardPosition }`;\n\t// @if CK_DEBUG_ENGINE // }\n}\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module engine/model/operation/splitoperation\n */\n\nimport Operation from './operation';\nimport MergeOperation from './mergeoperation';\nimport Position from '../position';\nimport Range from '../range';\nimport { _insert, _move } from './utils';\n\nimport CKEditorError from '@ckeditor/ckeditor5-utils/src/ckeditorerror';\n\n/**\n * Operation to split {@link module:engine/model/element~Element an element} at given\n * {@link module:engine/model/operation/splitoperation~SplitOperation#splitPosition split position} into two elements,\n * both containing a part of the element's original content.\n *\n * @extends module:engine/model/operation/operation~Operation\n */\nexport default class SplitOperation extends Operation {\n\t/**\n\t * Creates a split operation.\n\t *\n\t * @param {module:engine/model/position~Position} splitPosition Position at which an element should be split.\n\t * @param {Number} howMany Total offset size of elements that are in the split element after `position`.\n\t * @param {module:engine/model/position~Position|null} graveyardPosition Position in the graveyard root before the element which\n\t * should be used as a parent of the nodes after `position`. If it is not set, a copy of the the `position` parent will be used.\n\t * @param {Number|null} baseVersion Document {@link module:engine/model/document~Document#version} on which operation\n\t * can be applied or `null` if the operation operates on detached (non-document) tree.\n\t */\n\tconstructor( splitPosition, howMany, graveyardPosition, baseVersion ) {\n\t\tsuper( baseVersion );\n\n\t\t/**\n\t\t * Position at which an element should be split.\n\t\t *\n\t\t * @member {module:engine/model/position~Position} module:engine/model/operation/splitoperation~SplitOperation#splitPosition\n\t\t */\n\t\tthis.splitPosition = splitPosition.clone();\n\t\t// Keep position sticking to the next node. This way any new content added at the place where the element is split\n\t\t// will be left in the original element.\n\t\tthis.splitPosition.stickiness = 'toNext';\n\n\t\t/**\n\t\t * Total offset size of elements that are in the split element after `position`.\n\t\t *\n\t\t * @member {Number} module:engine/model/operation/splitoperation~SplitOperation#howMany\n\t\t */\n\t\tthis.howMany = howMany;\n\n\t\t/**\n\t\t * Position at which the clone of split element (or element from graveyard) will be inserted.\n\t\t *\n\t\t * @member {module:engine/model/position~Position} module:engine/model/operation/splitoperation~SplitOperation#insertionPosition\n\t\t */\n\t\tthis.insertionPosition = SplitOperation.getInsertionPosition( splitPosition );\n\t\tthis.insertionPosition.stickiness = 'toNone';\n\n\t\t/**\n\t\t * Position in the graveyard root before the element which should be used as a parent of the nodes after `position`.\n\t\t * If it is not set, a copy of the the `position` parent will be used.\n\t\t *\n\t\t * The default behavior is to clone the split element. Element from graveyard is used during undo.\n\t\t *\n\t\t * @member {module:engine/model/position~Position|null} #graveyardPosition\n\t\t */\n\t\tthis.graveyardPosition = graveyardPosition ? graveyardPosition.clone() : null;\n\n\t\tif ( this.graveyardPosition ) {\n\t\t\tthis.graveyardPosition.stickiness = 'toNext';\n\t\t}\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tget type() {\n\t\treturn 'split';\n\t}\n\n\t/**\n\t * Position inside the new clone of a split element.\n\t *\n\t * This is a position where nodes that are after the split position will be moved to.\n\t *\n\t * @readonly\n\t * @type {module:engine/model/position~Position}\n\t */\n\tget moveTargetPosition() {\n\t\tconst path = this.insertionPosition.path.slice();\n\t\tpath.push( 0 );\n\n\t\treturn new Position( this.insertionPosition.root, path );\n\t}\n\n\t/**\n\t * Artificial range that contains all the nodes from the split element that will be moved to the new element.\n\t * The range starts at {@link ~#splitPosition} and ends in the same parent, at `POSITIVE_INFINITY` offset.\n\t *\n\t * @readonly\n\t * @type {module:engine/model/range~Range}\n\t */\n\tget movedRange() {\n\t\tconst end = this.splitPosition.getShiftedBy( Number.POSITIVE_INFINITY );\n\n\t\treturn new Range( this.splitPosition, end );\n\t}\n\n\t/**\n\t * Creates and returns an operation that has the same parameters as this operation.\n\t *\n\t * @returns {module:engine/model/operation/splitoperation~SplitOperation} Clone of this operation.\n\t */\n\tclone() {\n\t\tconst split = new this.constructor( this.splitPosition, this.howMany, this.graveyardPosition, this.baseVersion );\n\t\tsplit.insertionPosition = this.insertionPosition;\n\n\t\treturn split;\n\t}\n\n\t/**\n\t * See {@link module:engine/model/operation/operation~Operation#getReversed `Operation#getReversed()`}.\n\t *\n\t * @returns {module:engine/model/operation/mergeoperation~MergeOperation}\n\t */\n\tgetReversed() {\n\t\tconst graveyard = this.splitPosition.root.document.graveyard;\n\t\tconst graveyardPosition = new Position( graveyard, [ 0 ] );\n\n\t\treturn new MergeOperation( this.moveTargetPosition, this.howMany, this.splitPosition, graveyardPosition, this.baseVersion + 1 );\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\t_validate() {\n\t\tconst element = this.splitPosition.parent;\n\t\tconst offset = this.splitPosition.offset;\n\n\t\t// Validate whether split operation has correct parameters.\n\t\tif ( !element || element.maxOffset < offset ) {\n\t\t\t/**\n\t\t\t * Split position is invalid.\n\t\t\t *\n\t\t\t * @error split-operation-position-invalid\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'split-operation-position-invalid', this );\n\t\t} else if ( !element.parent ) {\n\t\t\t/**\n\t\t\t * Cannot split root element.\n\t\t\t *\n\t\t\t * @error split-operation-split-in-root\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'split-operation-split-in-root', this );\n\t\t} else if ( this.howMany != element.maxOffset - this.splitPosition.offset ) {\n\t\t\t/**\n\t\t\t * Split operation specifies wrong number of nodes to move.\n\t\t\t *\n\t\t\t * @error split-operation-how-many-invalid\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'split-operation-how-many-invalid', this );\n\t\t} else if ( this.graveyardPosition && !this.graveyardPosition.nodeAfter ) {\n\t\t\t/**\n\t\t\t * Graveyard position invalid.\n\t\t\t *\n\t\t\t * @error split-operation-graveyard-position-invalid\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'split-operation-graveyard-position-invalid', this );\n\t\t}\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\t_execute() {\n\t\tconst splitElement = this.splitPosition.parent;\n\n\t\tif ( this.graveyardPosition ) {\n\t\t\t_move( Range._createFromPositionAndShift( this.graveyardPosition, 1 ), this.insertionPosition );\n\t\t} else {\n\t\t\tconst newElement = splitElement._clone();\n\n\t\t\t_insert( this.insertionPosition, newElement );\n\t\t}\n\n\t\tconst sourceRange = new Range(\n\t\t\tPosition._createAt( splitElement, this.splitPosition.offset ),\n\t\t\tPosition._createAt( splitElement, splitElement.maxOffset )\n\t\t);\n\n\t\t_move( sourceRange, this.moveTargetPosition );\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\ttoJSON() {\n\t\tconst json = super.toJSON();\n\n\t\tjson.splitPosition = this.splitPosition.toJSON();\n\t\tjson.insertionPosition = this.insertionPosition.toJSON();\n\n\t\tif ( this.graveyardPosition ) {\n\t\t\tjson.graveyardPosition = this.graveyardPosition.toJSON();\n\t\t}\n\n\t\treturn json;\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tstatic get className() {\n\t\treturn 'SplitOperation';\n\t}\n\n\t/**\n\t * Helper function that returns a default insertion position basing on given `splitPosition`. The default insertion\n\t * position is after the split element.\n\t *\n\t * @param {module:engine/model/position~Position} splitPosition\n\t * @returns {module:engine/model/position~Position}\n\t */\n\tstatic getInsertionPosition( splitPosition ) {\n\t\tconst path = splitPosition.path.slice( 0, -1 );\n\t\tpath[ path.length - 1 ]++;\n\n\t\treturn new Position( splitPosition.root, path );\n\t}\n\n\t/**\n\t * Creates `SplitOperation` object from deserilized object, i.e. from parsed JSON string.\n\t *\n\t * @param {Object} json Deserialized JSON object.\n\t * @param {module:engine/model/document~Document} document Document on which this operation will be applied.\n\t * @returns {module:engine/model/operation/splitoperation~SplitOperation}\n\t */\n\tstatic fromJSON( json, document ) {\n\t\tconst splitPosition = Position.fromJSON( json.splitPosition, document );\n\t\tconst insertionPosition = Position.fromJSON( json.insertionPosition, document );\n\t\tconst graveyardPosition = json.graveyardPosition ? Position.fromJSON( json.graveyardPosition, document ) : null;\n\n\t\tconst split = new this( splitPosition, json.howMany, graveyardPosition, json.baseVersion );\n\t\tsplit.insertionPosition = insertionPosition;\n\n\t\treturn split;\n\t}\n\n\t// @if CK_DEBUG_ENGINE // toString() {\n\t// @if CK_DEBUG_ENGINE // \treturn `SplitOperation( ${ this.baseVersion } ): ${ this.splitPosition } ` +\n\t// @if CK_DEBUG_ENGINE //\t\t`( ${ this.howMany } ) -> ${ this.insertionPosition }` +\n\t// @if CK_DEBUG_ENGINE //\t\t`${ this.graveyardPosition ? ' with ' + this.graveyardPosition : '' }`;\n\t// @if CK_DEBUG_ENGINE // }\n}\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module engine/model/rootelement\n */\n\nimport Element from './element';\n\n/**\n * Type of {@link module:engine/model/element~Element} that is a root of a model tree.\n * @extends module:engine/model/element~Element\n */\nexport default class RootElement extends Element {\n\t/**\n\t * Creates root element.\n\t *\n\t * @param {module:engine/model/document~Document} document Document that is an owner of this root.\n\t * @param {String} name Node name.\n\t * @param {String} [rootName='main'] Unique root name used to identify this root\n\t * element by {@link module:engine/model/document~Document}.\n\t */\n\tconstructor( document, name, rootName = 'main' ) {\n\t\tsuper( name );\n\n\t\t/**\n\t\t * Document that is an owner of this root.\n\t\t *\n\t\t * @private\n\t\t * @member {module:engine/model/document~Document}\n\t\t */\n\t\tthis._document = document;\n\n\t\t/**\n\t\t * Unique root name used to identify this root element by {@link module:engine/model/document~Document}.\n\t\t *\n\t\t * @readonly\n\t\t * @member {String}\n\t\t */\n\t\tthis.rootName = rootName;\n\t}\n\n\t/**\n\t * {@link module:engine/model/document~Document Document} that owns this root element.\n\t *\n\t * @readonly\n\t * @type {module:engine/model/document~Document|null}\n\t */\n\tget document() {\n\t\treturn this._document;\n\t}\n\n\t/**\n\t * Checks whether this object is of the given.\n\t *\n\t *\t\trootElement.is( 'rootElement' ); // -> true\n\t *\t\trootElement.is( 'element' ); // -> true\n\t *\t\trootElement.is( 'node' ); // -> true\n\t *\t\trootElement.is( 'model:rootElement' ); // -> true\n\t *\t\trootElement.is( 'model:element' ); // -> true\n\t *\t\trootElement.is( 'model:node' ); // -> true\n\t *\n\t *\t\trootElement.is( 'view:element' ); // -> false\n\t *\t\trootElement.is( 'documentFragment' ); // -> false\n\t *\n\t * Assuming that the object being checked is an element, you can also check its\n\t * {@link module:engine/model/element~Element#name name}:\n\t *\n\t *\t\trootElement.is( 'rootElement', '$root' ); // -> same as above\n\t *\n\t * {@link module:engine/model/node~Node#is Check the entire list of model objects} which implement the `is()` method.\n\t *\n\t * @param {String} type Type to check.\n\t * @param {String} [name] Element name.\n\t * @returns {Boolean}\n\t */\n\tis( type, name ) {\n\t\tif ( !name ) {\n\t\t\treturn type === 'rootElement' || type === 'model:rootElement' ||\n\t\t\t\t// From super.is(). This is highly utilised method and cannot call super. See ckeditor/ckeditor5#6529.\n\t\t\t\ttype === 'element' || type === 'model:element' ||\n\t\t\t\ttype === 'node' || type === 'model:node';\n\t\t}\n\n\t\treturn name === this.name && (\n\t\t\ttype === 'rootElement' || type === 'model:rootElement' ||\n\t\t\t// From super.is(). This is highly utilised method and cannot call super. See ckeditor/ckeditor5#6529.\n\t\t\ttype === 'element' || type === 'model:element'\n\t\t);\n\t}\n\n\t/**\n\t * Converts `RootElement` instance to `String` containing it's name.\n\t *\n\t * @returns {String} `RootElement` instance converted to `String`.\n\t */\n\ttoJSON() {\n\t\treturn this.rootName;\n\t}\n\n\t// @if CK_DEBUG_ENGINE // toString() {\n\t// @if CK_DEBUG_ENGINE // \treturn this.rootName;\n\t// @if CK_DEBUG_ENGINE // }\n\n\t// @if CK_DEBUG_ENGINE // log() {\n\t// @if CK_DEBUG_ENGINE // \tconsole.log( 'ModelRootElement: ' + this );\n\t// @if CK_DEBUG_ENGINE // }\n}\n\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module engine/model/writer\n */\n\nimport AttributeOperation from './operation/attributeoperation';\nimport DetachOperation from './operation/detachoperation';\nimport InsertOperation from './operation/insertoperation';\nimport MarkerOperation from './operation/markeroperation';\nimport MoveOperation from './operation/moveoperation';\nimport RenameOperation from './operation/renameoperation';\nimport RootAttributeOperation from './operation/rootattributeoperation';\nimport SplitOperation from './operation/splitoperation';\nimport MergeOperation from './operation/mergeoperation';\n\nimport DocumentFragment from './documentfragment';\nimport Text from './text';\nimport Element from './element';\nimport RootElement from './rootelement';\nimport Position from './position';\nimport Range from './range.js';\nimport DocumentSelection from './documentselection';\n\nimport toMap from '@ckeditor/ckeditor5-utils/src/tomap';\n\nimport CKEditorError from '@ckeditor/ckeditor5-utils/src/ckeditorerror';\n\n/**\n * The model can only be modified by using the writer. It should be used whenever you want to create a node, modify\n * child nodes, attributes or text, set the selection's position and its attributes.\n *\n * The instance of the writer is only available in the {@link module:engine/model/model~Model#change `change()`} or\n * {@link module:engine/model/model~Model#enqueueChange `enqueueChange()`}.\n *\n *\t\tmodel.change( writer => {\n *\t\t\twriter.insertText( 'foo', paragraph, 'end' );\n *\t\t} );\n *\n * Note that the writer should never be stored and used outside of the `change()` and\n * `enqueueChange()` blocks.\n *\n * Note that writer's methods do not check the {@link module:engine/model/schema~Schema}. It is possible\n * to create incorrect model structures by using the writer. Read more about in\n * {@glink framework/guides/deep-dive/schema#who-checks-the-schema \"Who checks the schema?\"}.\n *\n * @see module:engine/model/model~Model#change\n * @see module:engine/model/model~Model#enqueueChange\n */\nexport default class Writer {\n\t/**\n\t * Creates a writer instance.\n\t *\n\t * **Note:** It is not recommended to use it directly. Use {@link module:engine/model/model~Model#change `Model#change()`} or\n\t * {@link module:engine/model/model~Model#enqueueChange `Model#enqueueChange()`} instead.\n\t *\n\t * @protected\n\t * @param {module:engine/model/model~Model} model\n\t * @param {module:engine/model/batch~Batch} batch\n\t */\n\tconstructor( model, batch ) {\n\t\t/**\n\t\t * Instance of the model on which this writer operates.\n\t\t *\n\t\t * @readonly\n\t\t * @type {module:engine/model/model~Model}\n\t\t */\n\t\tthis.model = model;\n\n\t\t/**\n\t\t * The batch to which this writer will add changes.\n\t\t *\n\t\t * @readonly\n\t\t * @type {module:engine/model/batch~Batch}\n\t\t */\n\t\tthis.batch = batch;\n\t}\n\n\t/**\n\t * Creates a new {@link module:engine/model/text~Text text node}.\n\t *\n\t *\t\twriter.createText( 'foo' );\n\t *\t\twriter.createText( 'foo', { bold: true } );\n\t *\n\t * @param {String} data Text data.\n\t * @param {Object} [attributes] Text attributes.\n\t * @returns {module:engine/model/text~Text} Created text node.\n\t */\n\tcreateText( data, attributes ) {\n\t\treturn new Text( data, attributes );\n\t}\n\n\t/**\n\t * Creates a new {@link module:engine/model/element~Element element}.\n\t *\n\t *\t\twriter.createElement( 'paragraph' );\n\t *\t\twriter.createElement( 'paragraph', { alignment: 'center' } );\n\t *\n\t * @param {String} name Name of the element.\n\t * @param {Object} [attributes] Elements attributes.\n\t * @returns {module:engine/model/element~Element} Created element.\n\t */\n\tcreateElement( name, attributes ) {\n\t\treturn new Element( name, attributes );\n\t}\n\n\t/**\n\t * Creates a new {@link module:engine/model/documentfragment~DocumentFragment document fragment}.\n\t *\n\t * @returns {module:engine/model/documentfragment~DocumentFragment} Created document fragment.\n\t */\n\tcreateDocumentFragment() {\n\t\treturn new DocumentFragment();\n\t}\n\n\t/**\n\t * Creates a copy of the element and returns it. Created element has the same name and attributes as the original element.\n\t * If clone is deep, the original element's children are also cloned. If not, then empty element is returned.\n\t *\n\t * @param {module:engine/model/element~Element} element The element to clone.\n\t * @param {Boolean} [deep=true] If set to `true` clones element and all its children recursively. When set to `false`,\n\t * element will be cloned without any child.\n\t */\n\tcloneElement( element, deep = true ) {\n\t\treturn element._clone( deep );\n\t}\n\n\t/**\n\t * Inserts item on given position.\n\t *\n\t *\t\tconst paragraph = writer.createElement( 'paragraph' );\n\t *\t\twriter.insert( paragraph, position );\n\t *\n\t * Instead of using position you can use parent and offset:\n\t *\n\t *\t\tconst text = writer.createText( 'foo' );\n\t *\t\twriter.insert( text, paragraph, 5 );\n\t *\n\t * You can also use `end` instead of the offset to insert at the end:\n\t *\n\t *\t\tconst text = writer.createText( 'foo' );\n\t *\t\twriter.insert( text, paragraph, 'end' );\n\t *\n\t * Or insert before or after another element:\n\t *\n\t *\t\tconst paragraph = writer.createElement( 'paragraph' );\n\t *\t\twriter.insert( paragraph, anotherParagraph, 'after' );\n\t *\n\t * These parameters works the same way as {@link #createPositionAt `writer.createPositionAt()`}.\n\t *\n\t * Note that if the item already has parent it will be removed from the previous parent.\n\t *\n\t * Note that you cannot re-insert a node from a document to a different document or a document fragment. In this case,\n\t * `model-writer-insert-forbidden-move` is thrown.\n\t *\n\t * If you want to move {@link module:engine/model/range~Range range} instead of an\n\t * {@link module:engine/model/item~Item item} use {@link module:engine/model/writer~Writer#move `Writer#move()`}.\n\t *\n\t * **Note:** For a paste-like content insertion mechanism see\n\t * {@link module:engine/model/model~Model#insertContent `model.insertContent()`}.\n\t *\n\t * @param {module:engine/model/item~Item|module:engine/model/documentfragment~DocumentFragment} item Item or document\n\t * fragment to insert.\n\t * @param {module:engine/model/item~Item|module:engine/model/position~Position} itemOrPosition\n\t * @param {Number|'end'|'before'|'after'} [offset] Offset or one of the flags. Used only when\n\t * second parameter is a {@link module:engine/model/item~Item model item}.\n\t */\n\tinsert( item, itemOrPosition, offset = 0 ) {\n\t\tthis._assertWriterUsedCorrectly();\n\n\t\tif ( item instanceof Text && item.data == '' ) {\n\t\t\treturn;\n\t\t}\n\n\t\tconst position = Position._createAt( itemOrPosition, offset );\n\n\t\t// If item has a parent already.\n\t\tif ( item.parent ) {\n\t\t\t// We need to check if item is going to be inserted within the same document.\n\t\t\tif ( isSameTree( item.root, position.root ) ) {\n\t\t\t\t// If it's we just need to move it.\n\t\t\t\tthis.move( Range._createOn( item ), position );\n\n\t\t\t\treturn;\n\t\t\t}\n\t\t\t// If it isn't the same root.\n\t\t\telse {\n\t\t\t\tif ( item.root.document ) {\n\t\t\t\t\t/**\n\t\t\t\t\t * Cannot move a node from a document to a different tree.\n\t\t\t\t\t * It is forbidden to move a node that was already in a document outside of it.\n\t\t\t\t\t *\n\t\t\t\t\t * @error model-writer-insert-forbidden-move\n\t\t\t\t\t */\n\t\t\t\t\tthrow new CKEditorError(\n\t\t\t\t\t\t'model-writer-insert-forbidden-move',\n\t\t\t\t\t\tthis\n\t\t\t\t\t);\n\t\t\t\t} else {\n\t\t\t\t\t// Move between two different document fragments or from document fragment to a document is possible.\n\t\t\t\t\t// In that case, remove the item from it's original parent.\n\t\t\t\t\tthis.remove( item );\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\n\t\tconst version = position.root.document ? position.root.document.version : null;\n\n\t\tconst insert = new InsertOperation( position, item, version );\n\n\t\tif ( item instanceof Text ) {\n\t\t\tinsert.shouldReceiveAttributes = true;\n\t\t}\n\n\t\tthis.batch.addOperation( insert );\n\t\tthis.model.applyOperation( insert );\n\n\t\t// When element is a DocumentFragment we need to move its markers to Document#markers.\n\t\tif ( item instanceof DocumentFragment ) {\n\t\t\tfor ( const [ markerName, markerRange ] of item.markers ) {\n\t\t\t\t// We need to migrate marker range from DocumentFragment to Document.\n\t\t\t\tconst rangeRootPosition = Position._createAt( markerRange.root, 0 );\n\t\t\t\tconst range = new Range(\n\t\t\t\t\tmarkerRange.start._getCombined( rangeRootPosition, position ),\n\t\t\t\t\tmarkerRange.end._getCombined( rangeRootPosition, position )\n\t\t\t\t);\n\n\t\t\t\tconst options = { range, usingOperation: true, affectsData: true };\n\n\t\t\t\tif ( this.model.markers.has( markerName ) ) {\n\t\t\t\t\tthis.updateMarker( markerName, options );\n\t\t\t\t} else {\n\t\t\t\t\tthis.addMarker( markerName, options );\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\t}\n\n\t/**\n\t * Creates and inserts text on given position. You can optionally set text attributes:\n\t *\n\t *\t\twriter.insertText( 'foo', position );\n\t *\t\twriter.insertText( 'foo', { bold: true }, position );\n\t *\n\t * Instead of using position you can use parent and offset or define that text should be inserted at the end\n\t * or before or after other node:\n\t *\n\t *\t\t// Inserts 'foo' in paragraph, at offset 5:\n\t *\t\twriter.insertText( 'foo', paragraph, 5 );\n\t *\t\t// Inserts 'foo' at the end of a paragraph:\n\t *\t\twriter.insertText( 'foo', paragraph, 'end' );\n\t *\t\t// Inserts 'foo' after an image:\n\t *\t\twriter.insertText( 'foo', image, 'after' );\n\t *\n\t * These parameters work in the same way as {@link #createPositionAt `writer.createPositionAt()`}.\n\t *\n\t * @param {String} data Text data.\n\t * @param {Object} [attributes] Text attributes.\n\t * @param {module:engine/model/item~Item|module:engine/model/position~Position} itemOrPosition\n\t * @param {Number|'end'|'before'|'after'} [offset] Offset or one of the flags. Used only when\n\t * third parameter is a {@link module:engine/model/item~Item model item}.\n\t */\n\tinsertText( text, attributes, itemOrPosition, offset ) {\n\t\tif ( attributes instanceof DocumentFragment || attributes instanceof Element || attributes instanceof Position ) {\n\t\t\tthis.insert( this.createText( text ), attributes, itemOrPosition );\n\t\t} else {\n\t\t\tthis.insert( this.createText( text, attributes ), itemOrPosition, offset );\n\t\t}\n\t}\n\n\t/**\n\t * Creates and inserts element on given position. You can optionally set attributes:\n\t *\n\t *\t\twriter.insertElement( 'paragraph', position );\n\t *\t\twriter.insertElement( 'paragraph', { alignment: 'center' }, position );\n\t *\n\t * Instead of using position you can use parent and offset or define that text should be inserted at the end\n\t * or before or after other node:\n\t *\n\t *\t\t// Inserts paragraph in the root at offset 5:\n\t *\t\twriter.insertElement( 'paragraph', root, 5 );\n\t *\t\t// Inserts paragraph at the end of a blockquote:\n\t *\t\twriter.insertElement( 'paragraph', blockquote, 'end' );\n\t *\t\t// Inserts after an image:\n\t *\t\twriter.insertElement( 'paragraph', image, 'after' );\n\t *\n\t * These parameters works the same way as {@link #createPositionAt `writer.createPositionAt()`}.\n\t *\n\t * @param {String} name Name of the element.\n\t * @param {Object} [attributes] Elements attributes.\n\t * @param {module:engine/model/item~Item|module:engine/model/position~Position} itemOrPosition\n\t * @param {Number|'end'|'before'|'after'} [offset] Offset or one of the flags. Used only when\n\t * third parameter is a {@link module:engine/model/item~Item model item}.\n\t */\n\tinsertElement( name, attributes, itemOrPosition, offset ) {\n\t\tif ( attributes instanceof DocumentFragment || attributes instanceof Element || attributes instanceof Position ) {\n\t\t\tthis.insert( this.createElement( name ), attributes, itemOrPosition );\n\t\t} else {\n\t\t\tthis.insert( this.createElement( name, attributes ), itemOrPosition, offset );\n\t\t}\n\t}\n\n\t/**\n\t * Inserts item at the end of the given parent.\n\t *\n\t *\t\tconst paragraph = writer.createElement( 'paragraph' );\n\t *\t\twriter.append( paragraph, root );\n\t *\n\t * Note that if the item already has parent it will be removed from the previous parent.\n\t *\n\t * If you want to move {@link module:engine/model/range~Range range} instead of an\n\t * {@link module:engine/model/item~Item item} use {@link module:engine/model/writer~Writer#move `Writer#move()`}.\n\t *\n\t * @param {module:engine/model/item~Item|module:engine/model/documentfragment~DocumentFragment}\n\t * item Item or document fragment to insert.\n\t * @param {module:engine/model/element~Element|module:engine/model/documentfragment~DocumentFragment} parent\n\t */\n\tappend( item, parent ) {\n\t\tthis.insert( item, parent, 'end' );\n\t}\n\n\t/**\n\t * Creates text node and inserts it at the end of the parent. You can optionally set text attributes:\n\t *\n\t *\t\twriter.appendText( 'foo', paragraph );\n\t *\t\twriter.appendText( 'foo', { bold: true }, paragraph );\n\t *\n\t * @param {String} text Text data.\n\t * @param {Object} [attributes] Text attributes.\n\t * @param {module:engine/model/element~Element|module:engine/model/documentfragment~DocumentFragment} parent\n\t */\n\tappendText( text, attributes, parent ) {\n\t\tif ( attributes instanceof DocumentFragment || attributes instanceof Element ) {\n\t\t\tthis.insert( this.createText( text ), attributes, 'end' );\n\t\t} else {\n\t\t\tthis.insert( this.createText( text, attributes ), parent, 'end' );\n\t\t}\n\t}\n\n\t/**\n\t * Creates element and inserts it at the end of the parent. You can optionally set attributes:\n\t *\n\t *\t\twriter.appendElement( 'paragraph', root );\n\t *\t\twriter.appendElement( 'paragraph', { alignment: 'center' }, root );\n\t *\n\t * @param {String} name Name of the element.\n\t * @param {Object} [attributes] Elements attributes.\n\t * @param {module:engine/model/element~Element|module:engine/model/documentfragment~DocumentFragment} parent\n\t */\n\tappendElement( name, attributes, parent ) {\n\t\tif ( attributes instanceof DocumentFragment || attributes instanceof Element ) {\n\t\t\tthis.insert( this.createElement( name ), attributes, 'end' );\n\t\t} else {\n\t\t\tthis.insert( this.createElement( name, attributes ), parent, 'end' );\n\t\t}\n\t}\n\n\t/**\n\t * Sets value of the attribute with given key on a {@link module:engine/model/item~Item model item}\n\t * or on a {@link module:engine/model/range~Range range}.\n\t *\n\t * @param {String} key Attribute key.\n\t * @param {*} value Attribute new value.\n\t * @param {module:engine/model/item~Item|module:engine/model/range~Range} itemOrRange\n\t * Model item or range on which the attribute will be set.\n\t */\n\tsetAttribute( key, value, itemOrRange ) {\n\t\tthis._assertWriterUsedCorrectly();\n\n\t\tif ( itemOrRange instanceof Range ) {\n\t\t\tconst ranges = itemOrRange.getMinimalFlatRanges();\n\n\t\t\tfor ( const range of ranges ) {\n\t\t\t\tsetAttributeOnRange( this, key, value, range );\n\t\t\t}\n\t\t} else {\n\t\t\tsetAttributeOnItem( this, key, value, itemOrRange );\n\t\t}\n\t}\n\n\t/**\n\t * Sets values of attributes on a {@link module:engine/model/item~Item model item}\n\t * or on a {@link module:engine/model/range~Range range}.\n\t *\n\t *\t\twriter.setAttributes( {\n\t *\t\t\tbold: true,\n\t *\t\t\titalic: true\n\t *\t\t}, range );\n\t *\n\t * @param {Object} attributes Attributes keys and values.\n\t * @param {module:engine/model/item~Item|module:engine/model/range~Range} itemOrRange\n\t * Model item or range on which the attributes will be set.\n\t */\n\tsetAttributes( attributes, itemOrRange ) {\n\t\tfor ( const [ key, val ] of toMap( attributes ) ) {\n\t\t\tthis.setAttribute( key, val, itemOrRange );\n\t\t}\n\t}\n\n\t/**\n\t * Removes an attribute with given key from a {@link module:engine/model/item~Item model item}\n\t * or from a {@link module:engine/model/range~Range range}.\n\t *\n\t * @param {String} key Attribute key.\n\t * @param {module:engine/model/item~Item|module:engine/model/range~Range} itemOrRange\n\t * Model item or range from which the attribute will be removed.\n\t */\n\tremoveAttribute( key, itemOrRange ) {\n\t\tthis._assertWriterUsedCorrectly();\n\n\t\tif ( itemOrRange instanceof Range ) {\n\t\t\tconst ranges = itemOrRange.getMinimalFlatRanges();\n\n\t\t\tfor ( const range of ranges ) {\n\t\t\t\tsetAttributeOnRange( this, key, null, range );\n\t\t\t}\n\t\t} else {\n\t\t\tsetAttributeOnItem( this, key, null, itemOrRange );\n\t\t}\n\t}\n\n\t/**\n\t * Removes all attributes from all elements in the range or from the given item.\n\t *\n\t * @param {module:engine/model/item~Item|module:engine/model/range~Range} itemOrRange\n\t * Model item or range from which all attributes will be removed.\n\t */\n\tclearAttributes( itemOrRange ) {\n\t\tthis._assertWriterUsedCorrectly();\n\n\t\tconst removeAttributesFromItem = item => {\n\t\t\tfor ( const attribute of item.getAttributeKeys() ) {\n\t\t\t\tthis.removeAttribute( attribute, item );\n\t\t\t}\n\t\t};\n\n\t\tif ( !( itemOrRange instanceof Range ) ) {\n\t\t\tremoveAttributesFromItem( itemOrRange );\n\t\t} else {\n\t\t\tfor ( const item of itemOrRange.getItems() ) {\n\t\t\t\tremoveAttributesFromItem( item );\n\t\t\t}\n\t\t}\n\t}\n\n\t/**\n\t * Moves all items in the source range to the target position.\n\t *\n\t *\t\twriter.move( sourceRange, targetPosition );\n\t *\n\t * Instead of the target position you can use parent and offset or define that range should be moved to the end\n\t * or before or after chosen item:\n\t *\n\t *\t\t// Moves all items in the range to the paragraph at offset 5:\n\t *\t\twriter.move( sourceRange, paragraph, 5 );\n\t *\t\t// Moves all items in the range to the end of a blockquote:\n\t *\t\twriter.move( sourceRange, blockquote, 'end' );\n\t *\t\t// Moves all items in the range to a position after an image:\n\t *\t\twriter.move( sourceRange, image, 'after' );\n\t *\n\t * These parameters works the same way as {@link #createPositionAt `writer.createPositionAt()`}.\n\t *\n\t * Note that items can be moved only within the same tree. It means that you can move items within the same root\n\t * (element or document fragment) or between {@link module:engine/model/document~Document#roots documents roots},\n\t * but you can not move items from document fragment to the document or from one detached element to another. Use\n\t * {@link module:engine/model/writer~Writer#insert} in such cases.\n\t *\n\t * @param {module:engine/model/range~Range} range Source range.\n\t * @param {module:engine/model/item~Item|module:engine/model/position~Position} itemOrPosition\n\t * @param {Number|'end'|'before'|'after'} [offset] Offset or one of the flags. Used only when\n\t * second parameter is a {@link module:engine/model/item~Item model item}.\n\t */\n\tmove( range, itemOrPosition, offset ) {\n\t\tthis._assertWriterUsedCorrectly();\n\n\t\tif ( !( range instanceof Range ) ) {\n\t\t\t/**\n\t\t\t * Invalid range to move.\n\t\t\t *\n\t\t\t * @error writer-move-invalid-range\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'writer-move-invalid-range', this );\n\t\t}\n\n\t\tif ( !range.isFlat ) {\n\t\t\t/**\n\t\t\t * Range to move is not flat.\n\t\t\t *\n\t\t\t * @error writer-move-range-not-flat\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'writer-move-range-not-flat', this );\n\t\t}\n\n\t\tconst position = Position._createAt( itemOrPosition, offset );\n\n\t\t// Do not move anything if the move target is same as moved range start.\n\t\tif ( position.isEqual( range.start ) ) {\n\t\t\treturn;\n\t\t}\n\n\t\t// If part of the marker is removed, create additional marker operation for undo purposes.\n\t\tthis._addOperationForAffectedMarkers( 'move', range );\n\n\t\tif ( !isSameTree( range.root, position.root ) ) {\n\t\t\t/**\n\t\t\t * Range is going to be moved within not the same document. Please use\n\t\t\t * {@link module:engine/model/writer~Writer#insert insert} instead.\n\t\t\t *\n\t\t\t * @error writer-move-different-document\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'writer-move-different-document', this );\n\t\t}\n\n\t\tconst version = range.root.document ? range.root.document.version : null;\n\t\tconst operation = new MoveOperation( range.start, range.end.offset - range.start.offset, position, version );\n\n\t\tthis.batch.addOperation( operation );\n\t\tthis.model.applyOperation( operation );\n\t}\n\n\t/**\n\t * Removes given model {@link module:engine/model/item~Item item} or {@link module:engine/model/range~Range range}.\n\t *\n\t * @param {module:engine/model/item~Item|module:engine/model/range~Range} itemOrRange Model item or range to remove.\n\t */\n\tremove( itemOrRange ) {\n\t\tthis._assertWriterUsedCorrectly();\n\n\t\tconst rangeToRemove = itemOrRange instanceof Range ? itemOrRange : Range._createOn( itemOrRange );\n\t\tconst ranges = rangeToRemove.getMinimalFlatRanges().reverse();\n\n\t\tfor ( const flat of ranges ) {\n\t\t\t// If part of the marker is removed, create additional marker operation for undo purposes.\n\t\t\tthis._addOperationForAffectedMarkers( 'move', flat );\n\n\t\t\tapplyRemoveOperation( flat.start, flat.end.offset - flat.start.offset, this.batch, this.model );\n\t\t}\n\t}\n\n\t/**\n\t * Merges two siblings at the given position.\n\t *\n\t * Node before and after the position have to be an element. Otherwise `writer-merge-no-element-before` or\n\t * `writer-merge-no-element-after` error will be thrown.\n\t *\n\t * @param {module:engine/model/position~Position} position Position between merged elements.\n\t */\n\tmerge( position ) {\n\t\tthis._assertWriterUsedCorrectly();\n\n\t\tconst nodeBefore = position.nodeBefore;\n\t\tconst nodeAfter = position.nodeAfter;\n\n\t\t// If part of the marker is removed, create additional marker operation for undo purposes.\n\t\tthis._addOperationForAffectedMarkers( 'merge', position );\n\n\t\tif ( !( nodeBefore instanceof Element ) ) {\n\t\t\t/**\n\t\t\t * Node before merge position must be an element.\n\t\t\t *\n\t\t\t * @error writer-merge-no-element-before\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'writer-merge-no-element-before', this );\n\t\t}\n\n\t\tif ( !( nodeAfter instanceof Element ) ) {\n\t\t\t/**\n\t\t\t * Node after merge position must be an element.\n\t\t\t *\n\t\t\t * @error writer-merge-no-element-after\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'writer-merge-no-element-after', this );\n\t\t}\n\n\t\tif ( !position.root.document ) {\n\t\t\tthis._mergeDetached( position );\n\t\t} else {\n\t\t\tthis._merge( position );\n\t\t}\n\t}\n\n\t/**\n\t * Shortcut for {@link module:engine/model/model~Model#createPositionFromPath `Model#createPositionFromPath()`}.\n\t *\n\t * @param {module:engine/model/element~Element|module:engine/model/documentfragment~DocumentFragment} root Root of the position.\n\t * @param {Array.<Number>} path Position path. See {@link module:engine/model/position~Position#path}.\n\t * @param {module:engine/model/position~PositionStickiness} [stickiness='toNone'] Position stickiness.\n\t * See {@link module:engine/model/position~PositionStickiness}.\n\t * @returns {module:engine/model/position~Position}\n\t */\n\tcreatePositionFromPath( root, path, stickiness ) {\n\t\treturn this.model.createPositionFromPath( root, path, stickiness );\n\t}\n\n\t/**\n\t * Shortcut for {@link module:engine/model/model~Model#createPositionAt `Model#createPositionAt()`}.\n\t *\n\t * @param {module:engine/model/item~Item|module:engine/model/position~Position} itemOrPosition\n\t * @param {Number|'end'|'before'|'after'} [offset] Offset or one of the flags. Used only when\n\t * first parameter is a {@link module:engine/model/item~Item model item}.\n\t * @returns {module:engine/model/position~Position}\n\t */\n\tcreatePositionAt( itemOrPosition, offset ) {\n\t\treturn this.model.createPositionAt( itemOrPosition, offset );\n\t}\n\n\t/**\n\t * Shortcut for {@link module:engine/model/model~Model#createPositionAfter `Model#createPositionAfter()`}.\n\t *\n\t * @param {module:engine/model/item~Item} item Item after which the position should be placed.\n\t * @returns {module:engine/model/position~Position}\n\t */\n\tcreatePositionAfter( item ) {\n\t\treturn this.model.createPositionAfter( item );\n\t}\n\n\t/**\n\t * Shortcut for {@link module:engine/model/model~Model#createPositionBefore `Model#createPositionBefore()`}.\n\t *\n\t * @param {module:engine/model/item~Item} item Item after which the position should be placed.\n\t * @returns {module:engine/model/position~Position}\n\t */\n\tcreatePositionBefore( item ) {\n\t\treturn this.model.createPositionBefore( item );\n\t}\n\n\t/**\n\t * Shortcut for {@link module:engine/model/model~Model#createRange `Model#createRange()`}.\n\t *\n\t * @param {module:engine/model/position~Position} start Start position.\n\t * @param {module:engine/model/position~Position} [end] End position. If not set, range will be collapsed at `start` position.\n\t * @returns {module:engine/model/range~Range}\n\t */\n\tcreateRange( start, end ) {\n\t\treturn this.model.createRange( start, end );\n\t}\n\n\t/**\n\t * Shortcut for {@link module:engine/model/model~Model#createRangeIn `Model#createRangeIn()`}.\n\t *\n\t * @param {module:engine/model/element~Element} element Element which is a parent for the range.\n\t * @returns {module:engine/model/range~Range}\n\t */\n\tcreateRangeIn( element ) {\n\t\treturn this.model.createRangeIn( element );\n\t}\n\n\t/**\n\t * Shortcut for {@link module:engine/model/model~Model#createRangeOn `Model#createRangeOn()`}.\n\t *\n\t * @param {module:engine/model/element~Element} element Element which is a parent for the range.\n\t * @returns {module:engine/model/range~Range}\n\t */\n\tcreateRangeOn( element ) {\n\t\treturn this.model.createRangeOn( element );\n\t}\n\n\t/**\n\t * Shortcut for {@link module:engine/model/model~Model#createSelection `Model#createSelection()`}.\n\t *\n\t * @param {module:engine/model/selection~Selectable} selectable\n\t * @param {Number|'before'|'end'|'after'|'on'|'in'} [placeOrOffset] Sets place or offset of the selection.\n\t * @param {Object} [options]\n\t * @param {Boolean} [options.backward] Sets this selection instance to be backward.\n\t * @returns {module:engine/model/selection~Selection}\n\t */\n\tcreateSelection( selectable, placeOrOffset, options ) {\n\t\treturn this.model.createSelection( selectable, placeOrOffset, options );\n\t}\n\n\t/**\n\t * Performs merge action in a detached tree.\n\t *\n\t * @private\n\t * @param {module:engine/model/position~Position} position Position between merged elements.\n\t */\n\t_mergeDetached( position ) {\n\t\tconst nodeBefore = position.nodeBefore;\n\t\tconst nodeAfter = position.nodeAfter;\n\n\t\tthis.move( Range._createIn( nodeAfter ), Position._createAt( nodeBefore, 'end' ) );\n\t\tthis.remove( nodeAfter );\n\t}\n\n\t/**\n\t * Performs merge action in a non-detached tree.\n\t *\n\t * @private\n\t * @param {module:engine/model/position~Position} position Position between merged elements.\n\t */\n\t_merge( position ) {\n\t\tconst targetPosition = Position._createAt( position.nodeBefore, 'end' );\n\t\tconst sourcePosition = Position._createAt( position.nodeAfter, 0 );\n\n\t\tconst graveyard = position.root.document.graveyard;\n\t\tconst graveyardPosition = new Position( graveyard, [ 0 ] );\n\n\t\tconst version = position.root.document.version;\n\n\t\tconst merge = new MergeOperation( sourcePosition, position.nodeAfter.maxOffset, targetPosition, graveyardPosition, version );\n\n\t\tthis.batch.addOperation( merge );\n\t\tthis.model.applyOperation( merge );\n\t}\n\n\t/**\n\t * Renames the given element.\n\t *\n\t * @param {module:engine/model/element~Element} element The element to rename.\n\t * @param {String} newName New element name.\n\t */\n\trename( element, newName ) {\n\t\tthis._assertWriterUsedCorrectly();\n\n\t\tif ( !( element instanceof Element ) ) {\n\t\t\t/**\n\t\t\t * Trying to rename an object which is not an instance of Element.\n\t\t\t *\n\t\t\t * @error writer-rename-not-element-instance\n\t\t\t */\n\t\t\tthrow new CKEditorError(\n\t\t\t\t'writer-rename-not-element-instance',\n\t\t\t\tthis\n\t\t\t);\n\t\t}\n\n\t\tconst version = element.root.document ? element.root.document.version : null;\n\t\tconst renameOperation = new RenameOperation( Position._createBefore( element ), element.name, newName, version );\n\n\t\tthis.batch.addOperation( renameOperation );\n\t\tthis.model.applyOperation( renameOperation );\n\t}\n\n\t/**\n\t * Splits elements starting from the given position and going to the top of the model tree as long as given\n\t * `limitElement` is reached. When `limitElement` is not defined then only the parent of the given position will be split.\n\t *\n\t * The element needs to have a parent. It cannot be a root element nor a document fragment.\n\t * The `writer-split-element-no-parent` error will be thrown if you try to split an element with no parent.\n\t *\n\t * @param {module:engine/model/position~Position} position Position of split.\n\t * @param {module:engine/model/node~Node} [limitElement] Stop splitting when this element will be reached.\n\t * @returns {Object} result Split result.\n\t * @returns {module:engine/model/position~Position} result.position Position between split elements.\n\t * @returns {module:engine/model/range~Range} result.range Range that stars from the end of the first split element and ends\n\t * at the beginning of the first copy element.\n\t */\n\tsplit( position, limitElement ) {\n\t\tthis._assertWriterUsedCorrectly();\n\n\t\tlet splitElement = position.parent;\n\n\t\tif ( !splitElement.parent ) {\n\t\t\t/**\n\t\t\t * Element with no parent can not be split.\n\t\t\t *\n\t\t\t * @error writer-split-element-no-parent\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'writer-split-element-no-parent', this );\n\t\t}\n\n\t\t// When limit element is not defined lets set splitElement parent as limit.\n\t\tif ( !limitElement ) {\n\t\t\tlimitElement = splitElement.parent;\n\t\t}\n\n\t\tif ( !position.parent.getAncestors( { includeSelf: true } ).includes( limitElement ) ) {\n\t\t\t/**\n\t\t\t * Limit element is not a position ancestor.\n\t\t\t *\n\t\t\t * @error writer-split-invalid-limit-element\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'writer-split-invalid-limit-element', this );\n\t\t}\n\n\t\t// We need to cache elements that will be created as a result of the first split because\n\t\t// we need to create a range from the end of the first split element to the beginning of the\n\t\t// first copy element. This should be handled by LiveRange but it doesn't work on detached nodes.\n\t\tlet firstSplitElement, firstCopyElement;\n\n\t\tdo {\n\t\t\tconst version = splitElement.root.document ? splitElement.root.document.version : null;\n\t\t\tconst howMany = splitElement.maxOffset - position.offset;\n\t\t\tconst split = new SplitOperation( position, howMany, null, version );\n\n\t\t\tthis.batch.addOperation( split );\n\t\t\tthis.model.applyOperation( split );\n\n\t\t\t// Cache result of the first split.\n\t\t\tif ( !firstSplitElement && !firstCopyElement ) {\n\t\t\t\tfirstSplitElement = splitElement;\n\t\t\t\tfirstCopyElement = position.parent.nextSibling;\n\t\t\t}\n\n\t\t\tposition = this.createPositionAfter( position.parent );\n\t\t\tsplitElement = position.parent;\n\t\t} while ( splitElement !== limitElement );\n\n\t\treturn {\n\t\t\tposition,\n\t\t\trange: new Range( Position._createAt( firstSplitElement, 'end' ), Position._createAt( firstCopyElement, 0 ) )\n\t\t};\n\t}\n\n\t/**\n\t * Wraps the given range with the given element or with a new element (if a string was passed).\n\t *\n\t * **Note:** range to wrap should be a \"flat range\" (see {@link module:engine/model/range~Range#isFlat `Range#isFlat`}).\n\t * If not, an error will be thrown.\n\t *\n\t * @param {module:engine/model/range~Range} range Range to wrap.\n\t * @param {module:engine/model/element~Element|String} elementOrString Element or name of element to wrap the range with.\n\t */\n\twrap( range, elementOrString ) {\n\t\tthis._assertWriterUsedCorrectly();\n\n\t\tif ( !range.isFlat ) {\n\t\t\t/**\n\t\t\t * Range to wrap is not flat.\n\t\t\t *\n\t\t\t * @error writer-wrap-range-not-flat\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'writer-wrap-range-not-flat', this );\n\t\t}\n\n\t\tconst element = elementOrString instanceof Element ? elementOrString : new Element( elementOrString );\n\n\t\tif ( element.childCount > 0 ) {\n\t\t\t/**\n\t\t\t * Element to wrap with is not empty.\n\t\t\t *\n\t\t\t * @error writer-wrap-element-not-empty\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'writer-wrap-element-not-empty', this );\n\t\t}\n\n\t\tif ( element.parent !== null ) {\n\t\t\t/**\n\t\t\t * Element to wrap with is already attached to a tree model.\n\t\t\t *\n\t\t\t * @error writer-wrap-element-attached\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'writer-wrap-element-attached', this );\n\t\t}\n\n\t\tthis.insert( element, range.start );\n\n\t\t// Shift the range-to-wrap because we just inserted an element before that range.\n\t\tconst shiftedRange = new Range( range.start.getShiftedBy( 1 ), range.end.getShiftedBy( 1 ) );\n\n\t\tthis.move( shiftedRange, Position._createAt( element, 0 ) );\n\t}\n\n\t/**\n\t * Unwraps children of the given element – all its children are moved before it and then the element is removed.\n\t * Throws error if you try to unwrap an element which does not have a parent.\n\t *\n\t * @param {module:engine/model/element~Element} element Element to unwrap.\n\t */\n\tunwrap( element ) {\n\t\tthis._assertWriterUsedCorrectly();\n\n\t\tif ( element.parent === null ) {\n\t\t\t/**\n\t\t\t * Trying to unwrap an element which has no parent.\n\t\t\t *\n\t\t\t * @error writer-unwrap-element-no-parent\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'writer-unwrap-element-no-parent', this );\n\t\t}\n\n\t\tthis.move( Range._createIn( element ), this.createPositionAfter( element ) );\n\t\tthis.remove( element );\n\t}\n\n\t/**\n\t * Adds a {@link module:engine/model/markercollection~Marker marker}. Marker is a named range, which tracks\n\t * changes in the document and updates its range automatically, when model tree changes.\n\t *\n\t * As the first parameter you can set marker name.\n\t *\n\t * The required `options.usingOperation` parameter lets you decide if the marker should be managed by operations or not. See\n\t * {@link module:engine/model/markercollection~Marker marker class description} to learn about the difference between\n\t * markers managed by operations and not-managed by operations.\n\t *\n\t * The `options.affectsData` parameter, which defaults to `false`, allows you to define if a marker affects the data. It should be\n\t * `true` when the marker change changes the data returned by the\n\t * {@link module:core/editor/utils/dataapimixin~DataApi#getData `editor.getData()`} method.\n\t * When set to `true` it fires the {@link module:engine/model/document~Document#event:change:data `change:data`} event.\n\t * When set to `false` it fires the {@link module:engine/model/document~Document#event:change `change`} event.\n\t *\n\t * Create marker directly base on marker's name:\n\t *\n\t *\t\taddMarker( markerName, { range, usingOperation: false } );\n\t *\n\t * Create marker using operation:\n\t *\n\t *\t\taddMarker( markerName, { range, usingOperation: true } );\n\t *\n\t * Create marker that affects the editor data:\n\t *\n\t *\t\taddMarker( markerName, { range, usingOperation: false, affectsData: true } );\n\t *\n\t * Note: For efficiency reasons, it's best to create and keep as little markers as possible.\n\t *\n\t * @see module:engine/model/markercollection~Marker\n\t * @param {String} name Name of a marker to create - must be unique.\n\t * @param {Object} options\n\t * @param {Boolean} options.usingOperation Flag indicating that the marker should be added by MarkerOperation.\n\t * See {@link module:engine/model/markercollection~Marker#managedUsingOperations}.\n\t * @param {module:engine/model/range~Range} options.range Marker range.\n\t * @param {Boolean} [options.affectsData=false] Flag indicating that the marker changes the editor data.\n\t * @returns {module:engine/model/markercollection~Marker} Marker that was set.\n\t */\n\taddMarker( name, options ) {\n\t\tthis._assertWriterUsedCorrectly();\n\n\t\tif ( !options || typeof options.usingOperation != 'boolean' ) {\n\t\t\t/**\n\t\t\t * The `options.usingOperation` parameter is required when adding a new marker.\n\t\t\t *\n\t\t\t * @error writer-addmarker-no-usingoperation\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'writer-addmarker-no-usingoperation', this );\n\t\t}\n\n\t\tconst usingOperation = options.usingOperation;\n\t\tconst range = options.range;\n\t\tconst affectsData = options.affectsData === undefined ? false : options.affectsData;\n\n\t\tif ( this.model.markers.has( name ) ) {\n\t\t\t/**\n\t\t\t * Marker with provided name already exists.\n\t\t\t *\n\t\t\t * @error writer-addmarker-marker-exists\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'writer-addmarker-marker-exists', this );\n\t\t}\n\n\t\tif ( !range ) {\n\t\t\t/**\n\t\t\t * Range parameter is required when adding a new marker.\n\t\t\t *\n\t\t\t * @error writer-addmarker-no-range\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'writer-addmarker-no-range', this );\n\t\t}\n\n\t\tif ( !usingOperation ) {\n\t\t\treturn this.model.markers._set( name, range, usingOperation, affectsData );\n\t\t}\n\n\t\tapplyMarkerOperation( this, name, null, range, affectsData );\n\n\t\treturn this.model.markers.get( name );\n\t}\n\n\t/**\n\t * Adds, updates or refreshes a {@link module:engine/model/markercollection~Marker marker}. Marker is a named range, which tracks\n\t * changes in the document and updates its range automatically, when model tree changes. Still, it is possible to change the\n\t * marker's range directly using this method.\n\t *\n\t * As the first parameter you can set marker name or instance. If none of them is provided, new marker, with a unique\n\t * name is created and returned.\n\t *\n\t * As the second parameter you can set the new marker data or leave this parameter as empty which will just refresh\n\t * the marker by triggering downcast conversion for it. Refreshing the marker is useful when you want to change\n\t * the marker {@link module:engine/view/element~Element view element} without changing any marker data.\n\t *\n\t * \t\tlet isCommentActive = false;\n\t *\n\t * \t\tmodel.conversion.markerToHighlight( {\n\t * \t\t\tmodel: 'comment',\n\t *\t\t\tview: data => {\n\t *\t\t\t\tconst classes = [ 'comment-marker' ];\n\t *\n\t *\t\t\t\tif ( isCommentActive ) {\n\t *\t\t\t\t\tclasses.push( 'comment-marker--active' );\n\t *\t\t\t\t}\n\t *\n\t *\t\t\t\treturn { classes };\n\t *\t\t\t}\n\t * \t\t} );\n\t *\n\t * \t\t// Change the property that indicates if marker is displayed as active or not.\n\t * \t\tisCommentActive = true;\n\t *\n\t * \t\t// And refresh the marker to convert it with additional class.\n\t * \t\tmodel.change( writer => writer.updateMarker( 'comment' ) );\n\t *\n\t * The `options.usingOperation` parameter lets you change if the marker should be managed by operations or not. See\n\t * {@link module:engine/model/markercollection~Marker marker class description} to learn about the difference between\n\t * markers managed by operations and not-managed by operations. It is possible to change this option for an existing marker.\n\t *\n\t * The `options.affectsData` parameter, which defaults to `false`, allows you to define if a marker affects the data. It should be\n\t * `true` when the marker change changes the data returned by\n\t * the {@link module:core/editor/utils/dataapimixin~DataApi#getData `editor.getData()`} method.\n\t * When set to `true` it fires the {@link module:engine/model/document~Document#event:change:data `change:data`} event.\n\t * When set to `false` it fires the {@link module:engine/model/document~Document#event:change `change`} event.\n\t *\n\t * Update marker directly base on marker's name:\n\t *\n\t *\t\tupdateMarker( markerName, { range } );\n\t *\n\t * Update marker using operation:\n\t *\n\t *\t\tupdateMarker( marker, { range, usingOperation: true } );\n\t *\t\tupdateMarker( markerName, { range, usingOperation: true } );\n\t *\n\t * Change marker's option (start using operations to manage it):\n\t *\n\t *\t\tupdateMarker( marker, { usingOperation: true } );\n\t *\n\t * Change marker's option (inform the engine, that the marker does not affect the data anymore):\n\t *\n\t *\t\tupdateMarker( markerName, { affectsData: false } );\n\t *\n\t * @see module:engine/model/markercollection~Marker\n\t * @param {String|module:engine/model/markercollection~Marker} markerOrName Name of a marker to update, or a marker instance.\n\t * @param {Object} [options] If options object is not defined then marker will be refreshed by triggering\n\t * downcast conversion for this marker with the same data.\n\t * @param {module:engine/model/range~Range} [options.range] Marker range to update.\n\t * @param {Boolean} [options.usingOperation] Flag indicated whether the marker should be added by MarkerOperation.\n\t * See {@link module:engine/model/markercollection~Marker#managedUsingOperations}.\n\t * @param {Boolean} [options.affectsData] Flag indicating that the marker changes the editor data.\n\t */\n\tupdateMarker( markerOrName, options ) {\n\t\tthis._assertWriterUsedCorrectly();\n\n\t\tconst markerName = typeof markerOrName == 'string' ? markerOrName : markerOrName.name;\n\t\tconst currentMarker = this.model.markers.get( markerName );\n\n\t\tif ( !currentMarker ) {\n\t\t\t/**\n\t\t\t * Marker with provided name does not exists.\n\t\t\t *\n\t\t\t * @error writer-updatemarker-marker-not-exists\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'writer-updatemarker-marker-not-exists', this );\n\t\t}\n\n\t\tif ( !options ) {\n\t\t\tthis.model.markers._refresh( currentMarker );\n\n\t\t\treturn;\n\t\t}\n\n\t\tconst hasUsingOperationDefined = typeof options.usingOperation == 'boolean';\n\t\tconst affectsDataDefined = typeof options.affectsData == 'boolean';\n\n\t\t// Use previously defined marker's affectsData if the property is not provided.\n\t\tconst affectsData = affectsDataDefined ? options.affectsData : currentMarker.affectsData;\n\n\t\tif ( !hasUsingOperationDefined && !options.range && !affectsDataDefined ) {\n\t\t\t/**\n\t\t\t * One of the options is required - provide range, usingOperations or affectsData.\n\t\t\t *\n\t\t\t * @error writer-updatemarker-wrong-options\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'writer-updatemarker-wrong-options', this );\n\t\t}\n\n\t\tconst currentRange = currentMarker.getRange();\n\t\tconst updatedRange = options.range ? options.range : currentRange;\n\n\t\tif ( hasUsingOperationDefined && options.usingOperation !== currentMarker.managedUsingOperations ) {\n\t\t\t// The marker type is changed so it's necessary to create proper operations.\n\t\t\tif ( options.usingOperation ) {\n\t\t\t\t// If marker changes to a managed one treat this as synchronizing existing marker.\n\t\t\t\t// Create `MarkerOperation` with `oldRange` set to `null`, so reverse operation will remove the marker.\n\t\t\t\tapplyMarkerOperation( this, markerName, null, updatedRange, affectsData );\n\t\t\t} else {\n\t\t\t\t// If marker changes to a marker that do not use operations then we need to create additional operation\n\t\t\t\t// that removes that marker first.\n\t\t\t\tapplyMarkerOperation( this, markerName, currentRange, null, affectsData );\n\n\t\t\t\t// Although not managed the marker itself should stay in model and its range should be preserver or changed to passed range.\n\t\t\t\tthis.model.markers._set( markerName, updatedRange, undefined, affectsData );\n\t\t\t}\n\n\t\t\treturn;\n\t\t}\n\n\t\t// Marker's type doesn't change so update it accordingly.\n\t\tif ( currentMarker.managedUsingOperations ) {\n\t\t\tapplyMarkerOperation( this, markerName, currentRange, updatedRange, affectsData );\n\t\t} else {\n\t\t\tthis.model.markers._set( markerName, updatedRange, undefined, affectsData );\n\t\t}\n\t}\n\n\t/**\n\t * Removes given {@link module:engine/model/markercollection~Marker marker} or marker with given name.\n\t * The marker is removed accordingly to how it has been created, so if the marker was created using operation,\n\t * it will be destroyed using operation.\n\t *\n\t * @param {module:engine/model/markercollection~Marker|String} markerOrName Marker or marker name to remove.\n\t */\n\tremoveMarker( markerOrName ) {\n\t\tthis._assertWriterUsedCorrectly();\n\n\t\tconst name = typeof markerOrName == 'string' ? markerOrName : markerOrName.name;\n\n\t\tif ( !this.model.markers.has( name ) ) {\n\t\t\t/**\n\t\t\t * Trying to remove marker which does not exist.\n\t\t\t *\n\t\t\t * @error writer-removemarker-no-marker\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'writer-removemarker-no-marker', this );\n\t\t}\n\n\t\tconst marker = this.model.markers.get( name );\n\n\t\tif ( !marker.managedUsingOperations ) {\n\t\t\tthis.model.markers._remove( name );\n\n\t\t\treturn;\n\t\t}\n\n\t\tconst oldRange = marker.getRange();\n\n\t\tapplyMarkerOperation( this, name, oldRange, null, marker.affectsData );\n\t}\n\n\t/**\n\t * Sets the document's selection (ranges and direction) to the specified location based on the given\n\t * {@link module:engine/model/selection~Selectable selectable} or creates an empty selection if no arguments were passed.\n\t *\n\t *\t\t// Sets selection to the given range.\n\t *\t\tconst range = writer.createRange( start, end );\n\t *\t\twriter.setSelection( range );\n\t *\n\t *\t\t// Sets selection to given ranges.\n\t *\t\tconst ranges = [ writer.createRange( start1, end2 ), writer.createRange( star2, end2 ) ];\n\t *\t\twriter.setSelection( ranges );\n\t *\n\t *\t\t// Sets selection to other selection.\n\t *\t\tconst otherSelection = writer.createSelection();\n\t *\t\twriter.setSelection( otherSelection );\n\t *\n\t *\t\t// Sets selection to the given document selection.\n\t *\t\tconst documentSelection = model.document.selection;\n\t *\t\twriter.setSelection( documentSelection );\n\t *\n\t *\t\t// Sets collapsed selection at the given position.\n\t *\t\tconst position = writer.createPosition( root, path );\n\t *\t\twriter.setSelection( position );\n\t *\n\t *\t\t// Sets collapsed selection at the position of the given node and an offset.\n\t *\t\twriter.setSelection( paragraph, offset );\n\t *\n\t * Creates a range inside an {@link module:engine/model/element~Element element} which starts before the first child of\n \t * that element and ends after the last child of that element.\n\t *\n\t *\t\twriter.setSelection( paragraph, 'in' );\n\t *\n\t * Creates a range on an {@link module:engine/model/item~Item item} which starts before the item and ends just after the item.\n\t *\n\t *\t\twriter.setSelection( paragraph, 'on' );\n\t *\n\t *\t\t// Removes all selection's ranges.\n\t *\t\twriter.setSelection( null );\n\t *\n\t * `Writer#setSelection()` allow passing additional options (`backward`) as the last argument.\n\t *\n\t *\t\t// Sets selection as backward.\n\t *\t\twriter.setSelection( range, { backward: true } );\n\t *\n\t * Throws `writer-incorrect-use` error when the writer is used outside the `change()` block.\n\t *\n\t * @param {module:engine/model/selection~Selectable} selectable\n\t * @param {Number|'before'|'end'|'after'|'on'|'in'} [placeOrOffset] Sets place or offset of the selection.\n\t * @param {Object} [options]\n\t * @param {Boolean} [options.backward] Sets this selection instance to be backward.\n\t */\n\tsetSelection( selectable, placeOrOffset, options ) {\n\t\tthis._assertWriterUsedCorrectly();\n\n\t\tthis.model.document.selection._setTo( selectable, placeOrOffset, options );\n\t}\n\n\t/**\n\t * Moves {@link module:engine/model/documentselection~DocumentSelection#focus} to the specified location.\n\t *\n\t * The location can be specified in the same form as\n\t * {@link #createPositionAt `writer.createPositionAt()`} parameters.\n\t *\n\t * @param {module:engine/model/item~Item|module:engine/model/position~Position} itemOrPosition\n\t * @param {Number|'end'|'before'|'after'} [offset=0] Offset or one of the flags. Used only when\n\t * first parameter is a {@link module:engine/model/item~Item model item}.\n\t */\n\tsetSelectionFocus( itemOrPosition, offset ) {\n\t\tthis._assertWriterUsedCorrectly();\n\n\t\tthis.model.document.selection._setFocus( itemOrPosition, offset );\n\t}\n\n\t/**\n\t * Sets attribute(s) on the selection. If attribute with the same key already is set, it's value is overwritten.\n\t *\n\t * Using key and value pair:\n\t *\n\t * \twriter.setSelectionAttribute( 'italic', true );\n\t *\n\t * Using key-value object:\n\t *\n\t * \twriter.setSelectionAttribute( { italic: true, bold: false } );\n\t *\n\t * Using iterable object:\n\t *\n\t * \twriter.setSelectionAttribute( new Map( [ [ 'italic', true ] ] ) );\n\t *\n\t * @param {String|Object|Iterable.<*>} keyOrObjectOrIterable Key of the attribute to set\n\t * or object / iterable of key => value attribute pairs.\n\t * @param {*} [value] Attribute value.\n\t */\n\tsetSelectionAttribute( keyOrObjectOrIterable, value ) {\n\t\tthis._assertWriterUsedCorrectly();\n\n\t\tif ( typeof keyOrObjectOrIterable === 'string' ) {\n\t\t\tthis._setSelectionAttribute( keyOrObjectOrIterable, value );\n\t\t} else {\n\t\t\tfor ( const [ key, value ] of toMap( keyOrObjectOrIterable ) ) {\n\t\t\t\tthis._setSelectionAttribute( key, value );\n\t\t\t}\n\t\t}\n\t}\n\n\t/**\n\t * Removes attribute(s) with given key(s) from the selection.\n\t *\n\t * Remove one attribute:\n\t *\n\t *\t\twriter.removeSelectionAttribute( 'italic' );\n\t *\n\t * Remove multiple attributes:\n\t *\n\t *\t\twriter.removeSelectionAttribute( [ 'italic', 'bold' ] );\n\t *\n\t * @param {String|Iterable.<String>} keyOrIterableOfKeys Key of the attribute to remove or an iterable of attribute keys to remove.\n\t */\n\tremoveSelectionAttribute( keyOrIterableOfKeys ) {\n\t\tthis._assertWriterUsedCorrectly();\n\n\t\tif ( typeof keyOrIterableOfKeys === 'string' ) {\n\t\t\tthis._removeSelectionAttribute( keyOrIterableOfKeys );\n\t\t} else {\n\t\t\tfor ( const key of keyOrIterableOfKeys ) {\n\t\t\t\tthis._removeSelectionAttribute( key );\n\t\t\t}\n\t\t}\n\t}\n\n\t/**\n\t * Temporarily changes the {@link module:engine/model/documentselection~DocumentSelection#isGravityOverridden gravity}\n\t * of the selection from left to right.\n\t *\n\t * The gravity defines from which direction the selection inherits its attributes. If it's the default left gravity,\n\t * then the selection (after being moved by the user) inherits attributes from its left-hand side.\n\t * This method allows to temporarily override this behavior by forcing the gravity to the right.\n\t *\n\t * For the following model fragment:\n\t *\n\t *\t\t<$text bold=\"true\" linkHref=\"url\">bar[]</$text><$text bold=\"true\">biz</$text>\n\t *\n\t * * Default gravity: selection will have the `bold` and `linkHref` attributes.\n\t * * Overridden gravity: selection will have `bold` attribute.\n\t *\n\t * **Note**: It returns an unique identifier which is required to restore the gravity. It guarantees the symmetry\n\t * of the process.\n\t *\n\t * @returns {String} The unique id which allows restoring the gravity.\n\t */\n\toverrideSelectionGravity() {\n\t\treturn this.model.document.selection._overrideGravity();\n\t}\n\n\t/**\n\t * Restores {@link ~Writer#overrideSelectionGravity} gravity to default.\n\t *\n\t * Restoring the gravity is only possible using the unique identifier returned by\n\t * {@link ~Writer#overrideSelectionGravity}. Note that the gravity remains overridden as long as won't be restored\n\t * the same number of times it was overridden.\n\t *\n\t * @param {String} uid The unique id returned by {@link ~Writer#overrideSelectionGravity}.\n\t */\n\trestoreSelectionGravity( uid ) {\n\t\tthis.model.document.selection._restoreGravity( uid );\n\t}\n\n\t/**\n\t * @private\n\t * @param {String} key Key of the attribute to remove.\n\t * @param {*} value Attribute value.\n\t */\n\t_setSelectionAttribute( key, value ) {\n\t\tconst selection = this.model.document.selection;\n\n\t\t// Store attribute in parent element if the selection is collapsed in an empty node.\n\t\tif ( selection.isCollapsed && selection.anchor.parent.isEmpty ) {\n\t\t\tconst storeKey = DocumentSelection._getStoreAttributeKey( key );\n\n\t\t\tthis.setAttribute( storeKey, value, selection.anchor.parent );\n\t\t}\n\n\t\tselection._setAttribute( key, value );\n\t}\n\n\t/**\n\t * @private\n\t * @param {String} key Key of the attribute to remove.\n\t */\n\t_removeSelectionAttribute( key ) {\n\t\tconst selection = this.model.document.selection;\n\n\t\t// Remove stored attribute from parent element if the selection is collapsed in an empty node.\n\t\tif ( selection.isCollapsed && selection.anchor.parent.isEmpty ) {\n\t\t\tconst storeKey = DocumentSelection._getStoreAttributeKey( key );\n\n\t\t\tthis.removeAttribute( storeKey, selection.anchor.parent );\n\t\t}\n\n\t\tselection._removeAttribute( key );\n\t}\n\n\t/**\n\t * Throws `writer-detached-writer-tries-to-modify-model` error when the writer is used outside of the `change()` block.\n\t *\n\t * @private\n\t */\n\t_assertWriterUsedCorrectly() {\n\t\t/**\n\t\t * Trying to use a writer outside a {@link module:engine/model/model~Model#change `change()`} or\n\t\t * {@link module:engine/model/model~Model#enqueueChange `enqueueChange()`} blocks.\n\t\t *\n\t\t * The writer can only be used inside these blocks which ensures that the model\n\t\t * can only be changed during such \"sessions\".\n\t\t *\n\t\t * @error writer-incorrect-use\n\t\t */\n\t\tif ( this.model._currentWriter !== this ) {\n\t\t\tthrow new CKEditorError( 'writer-incorrect-use', this );\n\t\t}\n\t}\n\n\t/**\n\t * For given action `type` and `positionOrRange` where the action happens, this function finds all affected markers\n\t * and applies a marker operation with the new marker range equal to the current range. Thanks to this, the marker range\n\t * can be later correctly processed during undo.\n\t *\n\t * @private\n\t * @param {'move'|'merge'} type Writer action type.\n\t * @param {module:engine/model/position~Position|module:engine/model/range~Range} positionOrRange Position or range\n\t * where the writer action happens.\n\t */\n\t_addOperationForAffectedMarkers( type, positionOrRange ) {\n\t\tfor ( const marker of this.model.markers ) {\n\t\t\tif ( !marker.managedUsingOperations ) {\n\t\t\t\tcontinue;\n\t\t\t}\n\n\t\t\tconst markerRange = marker.getRange();\n\t\t\tlet isAffected = false;\n\n\t\t\tif ( type === 'move' ) {\n\t\t\t\tisAffected =\n\t\t\t\t\tpositionOrRange.containsPosition( markerRange.start ) ||\n\t\t\t\t\tpositionOrRange.start.isEqual( markerRange.start ) ||\n\t\t\t\t\tpositionOrRange.containsPosition( markerRange.end ) ||\n\t\t\t\t\tpositionOrRange.end.isEqual( markerRange.end );\n\t\t\t} else {\n\t\t\t\t// if type === 'merge'.\n\t\t\t\tconst elementBefore = positionOrRange.nodeBefore;\n\t\t\t\tconst elementAfter = positionOrRange.nodeAfter;\n\n\t\t\t\t//               Start:  <p>Foo[</p><p>Bar]</p>\n\t\t\t\t//         After merge:  <p>Foo[Bar]</p>\n\t\t\t\t// After undoing split:  <p>Foo</p><p>[Bar]</p>     <-- incorrect, needs remembering for undo.\n\t\t\t\t//\n\t\t\t\tconst affectedInLeftElement = markerRange.start.parent == elementBefore && markerRange.start.isAtEnd;\n\n\t\t\t\t//               Start:  <p>[Foo</p><p>]Bar</p>\n\t\t\t\t//         After merge:  <p>[Foo]Bar</p>\n\t\t\t\t// After undoing split:  <p>[Foo]</p><p>Bar</p>     <-- incorrect, needs remembering for undo.\n\t\t\t\t//\n\t\t\t\tconst affectedInRightElement = markerRange.end.parent == elementAfter && markerRange.end.offset == 0;\n\n\t\t\t\t//               Start:  <p>[Foo</p>]<p>Bar</p>\n\t\t\t\t//         After merge:  <p>[Foo]Bar</p>\n\t\t\t\t// After undoing split:  <p>[Foo]</p><p>Bar</p>     <-- incorrect, needs remembering for undo.\n\t\t\t\t//\n\t\t\t\tconst affectedAfterLeftElement = markerRange.end.nodeAfter == elementAfter;\n\n\t\t\t\t//               Start:  <p>Foo</p>[<p>Bar]</p>\n\t\t\t\t//         After merge:  <p>Foo[Bar]</p>\n\t\t\t\t// After undoing split:  <p>Foo</p><p>[Bar]</p>     <-- incorrect, needs remembering for undo.\n\t\t\t\t//\n\t\t\t\tconst affectedBeforeRightElement = markerRange.start.nodeAfter == elementAfter;\n\n\t\t\t\tisAffected = affectedInLeftElement || affectedInRightElement || affectedAfterLeftElement || affectedBeforeRightElement;\n\t\t\t}\n\n\t\t\tif ( isAffected ) {\n\t\t\t\tthis.updateMarker( marker.name, { range: markerRange } );\n\t\t\t}\n\t\t}\n\t}\n}\n\n// Sets given attribute to each node in given range. When attribute value is null then attribute will be removed.\n//\n// Because attribute operation needs to have the same attribute value on the whole range, this function splits\n// the range into smaller parts.\n//\n// Given `range` must be flat.\n//\n// @private\n// @param {module:engine/model/writer~Writer} writer\n// @param {String} key Attribute key.\n// @param {*} value Attribute new value.\n// @param {module:engine/model/range~Range} range Model range on which the attribute will be set.\nfunction setAttributeOnRange( writer, key, value, range ) {\n\tconst model = writer.model;\n\tconst doc = model.document;\n\n\t// Position of the last split, the beginning of the new range.\n\tlet lastSplitPosition = range.start;\n\n\t// Currently position in the scanning range. Because we need value after the position, it is not a current\n\t// position of the iterator but the previous one (we need to iterate one more time to get the value after).\n\tlet position;\n\n\t// Value before the currently position.\n\tlet valueBefore;\n\n\t// Value after the currently position.\n\tlet valueAfter;\n\n\tfor ( const val of range.getWalker( { shallow: true } ) ) {\n\t\tvalueAfter = val.item.getAttribute( key );\n\n\t\t// At the first run of the iterator the position in undefined. We also do not have a valueBefore, but\n\t\t// because valueAfter may be null, valueBefore may be equal valueAfter ( undefined == null ).\n\t\tif ( position && valueBefore != valueAfter ) {\n\t\t\t// if valueBefore == value there is nothing to change, so we add operation only if these values are different.\n\t\t\tif ( valueBefore != value ) {\n\t\t\t\taddOperation();\n\t\t\t}\n\n\t\t\tlastSplitPosition = position;\n\t\t}\n\n\t\tposition = val.nextPosition;\n\t\tvalueBefore = valueAfter;\n\t}\n\n\t// Because position in the loop is not the iterator position (see let position comment), the last position in\n\t// the while loop will be last but one position in the range. We need to check the last position manually.\n\tif ( position instanceof Position && position != lastSplitPosition && valueBefore != value ) {\n\t\taddOperation();\n\t}\n\n\tfunction addOperation() {\n\t\tconst range = new Range( lastSplitPosition, position );\n\t\tconst version = range.root.document ? doc.version : null;\n\t\tconst operation = new AttributeOperation( range, key, valueBefore, value, version );\n\n\t\twriter.batch.addOperation( operation );\n\t\tmodel.applyOperation( operation );\n\t}\n}\n\n// Sets given attribute to the given node. When attribute value is null then attribute will be removed.\n//\n// @private\n// @param {module:engine/model/writer~Writer} writer\n// @param {String} key Attribute key.\n// @param {*} value Attribute new value.\n// @param {module:engine/model/item~Item} item Model item on which the attribute will be set.\nfunction setAttributeOnItem( writer, key, value, item ) {\n\tconst model = writer.model;\n\tconst doc = model.document;\n\tconst previousValue = item.getAttribute( key );\n\tlet range, operation;\n\n\tif ( previousValue != value ) {\n\t\tconst isRootChanged = item.root === item;\n\n\t\tif ( isRootChanged ) {\n\t\t\t// If we change attributes of root element, we have to use `RootAttributeOperation`.\n\t\t\tconst version = item.document ? doc.version : null;\n\n\t\t\toperation = new RootAttributeOperation( item, key, previousValue, value, version );\n\t\t} else {\n\t\t\trange = new Range( Position._createBefore( item ), writer.createPositionAfter( item ) );\n\n\t\t\tconst version = range.root.document ? doc.version : null;\n\n\t\t\toperation = new AttributeOperation( range, key, previousValue, value, version );\n\t\t}\n\n\t\twriter.batch.addOperation( operation );\n\t\tmodel.applyOperation( operation );\n\t}\n}\n\n// Creates and applies marker operation to {@link module:engine/model/operation/operation~Operation operation}.\n//\n// @private\n// @param {module:engine/model/writer~Writer} writer\n// @param {String} name Marker name.\n// @param {module:engine/model/range~Range} oldRange Marker range before the change.\n// @param {module:engine/model/range~Range} newRange Marker range after the change.\n// @param {Boolean} affectsData\nfunction applyMarkerOperation( writer, name, oldRange, newRange, affectsData ) {\n\tconst model = writer.model;\n\tconst doc = model.document;\n\n\tconst operation = new MarkerOperation( name, oldRange, newRange, model.markers, affectsData, doc.version );\n\n\twriter.batch.addOperation( operation );\n\tmodel.applyOperation( operation );\n}\n\n// Creates `MoveOperation` or `DetachOperation` that removes `howMany` nodes starting from `position`.\n// The operation will be applied on given model instance and added to given operation instance.\n//\n// @private\n// @param {module:engine/model/position~Position} position Position from which nodes are removed.\n// @param {Number} howMany Number of nodes to remove.\n// @param {Batch} batch Batch to which the operation will be added.\n// @param {module:engine/model/model~Model} model Model instance on which operation will be applied.\nfunction applyRemoveOperation( position, howMany, batch, model ) {\n\tlet operation;\n\n\tif ( position.root.document ) {\n\t\tconst doc = model.document;\n\t\tconst graveyardPosition = new Position( doc.graveyard, [ 0 ] );\n\n\t\toperation = new MoveOperation( position, howMany, graveyardPosition, doc.version );\n\t} else {\n\t\toperation = new DetachOperation( position, howMany );\n\t}\n\n\tbatch.addOperation( operation );\n\tmodel.applyOperation( operation );\n}\n\n// Returns `true` if both root elements are the same element or both are documents root elements.\n//\n// Elements in the same tree can be moved (for instance you can move element form one documents root to another, or\n// within the same document fragment), but when element supposed to be moved from document fragment to the document, or\n// to another document it should be removed and inserted to avoid problems with OT. This is because features like undo or\n// collaboration may track changes on the document but ignore changes on detached fragments and should not get\n// unexpected `move` operation.\nfunction isSameTree( rootA, rootB ) {\n\t// If it is the same root this is the same tree.\n\tif ( rootA === rootB ) {\n\t\treturn true;\n\t}\n\n\t// If both roots are documents root it is operation within the document what we still treat as the same tree.\n\tif ( rootA instanceof RootElement && rootB instanceof RootElement ) {\n\t\treturn true;\n\t}\n\n\treturn false;\n}\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module engine/model/differ\n */\n\nimport Position from './position';\nimport Range from './range';\n\n/**\n * Calculates the difference between two model states.\n *\n * Receives operations that are to be applied on the model document. Marks parts of the model document tree which\n * are changed and saves the state of these elements before the change. Then, it compares saved elements with the\n * changed elements, after all changes are applied on the model document. Calculates the diff between saved\n * elements and new ones and returns a change set.\n */\nexport default class Differ {\n\t/**\n\t * Creates a `Differ` instance.\n\t *\n\t * @param {module:engine/model/markercollection~MarkerCollection} markerCollection Model's marker collection.\n\t */\n\tconstructor( markerCollection ) {\n\t\t/**\n\t\t * Reference to the model's marker collection.\n\t\t *\n\t\t * @private\n\t\t * @type {module:engine/model/markercollection~MarkerCollection}\n\t\t */\n\t\tthis._markerCollection = markerCollection;\n\n\t\t/**\n\t\t * A map that stores changes that happened in a given element.\n\t\t *\n\t\t * The keys of the map are references to the model elements.\n\t\t * The values of the map are arrays with changes that were done on this element.\n\t\t *\n\t\t * @private\n\t\t * @type {Map}\n\t\t */\n\t\tthis._changesInElement = new Map();\n\n\t\t/**\n\t\t * A map that stores \"element's children snapshots\". A snapshot is representing children of a given element before\n\t\t * the first change was applied on that element. Snapshot items are objects with two properties: `name`,\n\t\t * containing the element name (or `'$text'` for a text node) and `attributes` which is a map of the node's attributes.\n\t\t *\n\t\t * @private\n\t\t * @type {Map}\n\t\t */\n\t\tthis._elementSnapshots = new Map();\n\n\t\t/**\n\t\t * A map that stores all changed markers.\n\t\t *\n\t\t * The keys of the map are marker names.\n\t\t * The values of the map are objects with the `oldRange` and `newRange` properties. They store the marker range\n\t\t * state before and after the change.\n\t\t *\n\t\t * @private\n\t\t * @type {Map}\n\t\t */\n\t\tthis._changedMarkers = new Map();\n\n\t\t/**\n\t\t * Stores the number of changes that were processed. Used to order the changes chronologically. It is important\n\t\t * when changes are sorted.\n\t\t *\n\t\t * @private\n\t\t * @type {Number}\n\t\t */\n\t\tthis._changeCount = 0;\n\n\t\t/**\n\t\t * For efficiency purposes, `Differ` stores the change set returned by the differ after {@link #getChanges} call.\n\t\t * Cache is reset each time a new operation is buffered. If the cache has not been reset, {@link #getChanges} will\n\t\t * return the cached value instead of calculating it again.\n\t\t *\n\t\t * This property stores those changes that did not take place in graveyard root.\n\t\t *\n\t\t * @private\n\t\t * @type {Array.<Object>|null}\n\t\t */\n\t\tthis._cachedChanges = null;\n\n\t\t/**\n\t\t * For efficiency purposes, `Differ` stores the change set returned by the differ after the {@link #getChanges} call.\n\t\t * The cache is reset each time a new operation is buffered. If the cache has not been reset, {@link #getChanges} will\n\t\t * return the cached value instead of calculating it again.\n\t\t *\n\t\t * This property stores all changes evaluated by `Differ`, including those that took place in the graveyard.\n\t\t *\n\t\t * @private\n\t\t * @type {Array.<Object>|null}\n\t\t */\n\t\tthis._cachedChangesWithGraveyard = null;\n\t}\n\n\t/**\n\t * Informs whether there are any changes buffered in `Differ`.\n\t *\n\t * @readonly\n\t * @type {Boolean}\n\t */\n\tget isEmpty() {\n\t\treturn this._changesInElement.size == 0 && this._changedMarkers.size == 0;\n\t}\n\n\t/**\n\t * Marks given `item` in differ to be \"refreshed\". It means that the item will be marked as removed and inserted in the differ changes\n\t * set, so it will be effectively re-converted when differ changes will be handled by a dispatcher.\n\t *\n\t * @param {module:engine/model/item~Item} item Item to refresh.\n\t */\n\trefreshItem( item ) {\n\t\tif ( this._isInInsertedElement( item.parent ) ) {\n\t\t\treturn;\n\t\t}\n\n\t\tthis._markRemove( item.parent, item.startOffset, item.offsetSize );\n\t\tthis._markInsert( item.parent, item.startOffset, item.offsetSize );\n\n\t\tconst range = Range._createOn( item );\n\n\t\tfor ( const marker of this._markerCollection.getMarkersIntersectingRange( range ) ) {\n\t\t\tconst markerRange = marker.getRange();\n\n\t\t\tthis.bufferMarkerChange( marker.name, markerRange, markerRange, marker.affectsData );\n\t\t}\n\n\t\t// Clear cache after each buffered operation as it is no longer valid.\n\t\tthis._cachedChanges = null;\n\t}\n\n\t/**\n\t * Buffers the given operation. An operation has to be buffered before it is executed.\n\t *\n\t * Operation type is checked and it is checked which nodes it will affect. These nodes are then stored in `Differ`\n\t * in the state before the operation is executed.\n\t *\n\t * @param {module:engine/model/operation/operation~Operation} operation An operation to buffer.\n\t */\n\tbufferOperation( operation ) {\n\t\t// Below we take an operation, check its type, then use its parameters in marking (private) methods.\n\t\t// The general rule is to not mark elements inside inserted element. All inserted elements are re-rendered.\n\t\t// Marking changes in them would cause a \"double\" changing then.\n\t\t//\n\t\tswitch ( operation.type ) {\n\t\t\tcase 'insert': {\n\t\t\t\tif ( this._isInInsertedElement( operation.position.parent ) ) {\n\t\t\t\t\treturn;\n\t\t\t\t}\n\n\t\t\t\tthis._markInsert( operation.position.parent, operation.position.offset, operation.nodes.maxOffset );\n\n\t\t\t\tbreak;\n\t\t\t}\n\t\t\tcase 'addAttribute':\n\t\t\tcase 'removeAttribute':\n\t\t\tcase 'changeAttribute': {\n\t\t\t\tfor ( const item of operation.range.getItems( { shallow: true } ) ) {\n\t\t\t\t\tif ( this._isInInsertedElement( item.parent ) ) {\n\t\t\t\t\t\tcontinue;\n\t\t\t\t\t}\n\n\t\t\t\t\tthis._markAttribute( item );\n\t\t\t\t}\n\n\t\t\t\tbreak;\n\t\t\t}\n\t\t\tcase 'remove':\n\t\t\tcase 'move':\n\t\t\tcase 'reinsert': {\n\t\t\t\t// When range is moved to the same position then not mark it as a change.\n\t\t\t\t// See: https://github.com/ckeditor/ckeditor5-engine/issues/1664.\n\t\t\t\tif (\n\t\t\t\t\toperation.sourcePosition.isEqual( operation.targetPosition ) ||\n\t\t\t\t\toperation.sourcePosition.getShiftedBy( operation.howMany ).isEqual( operation.targetPosition )\n\t\t\t\t) {\n\t\t\t\t\treturn;\n\t\t\t\t}\n\n\t\t\t\tconst sourceParentInserted = this._isInInsertedElement( operation.sourcePosition.parent );\n\t\t\t\tconst targetParentInserted = this._isInInsertedElement( operation.targetPosition.parent );\n\n\t\t\t\tif ( !sourceParentInserted ) {\n\t\t\t\t\tthis._markRemove( operation.sourcePosition.parent, operation.sourcePosition.offset, operation.howMany );\n\t\t\t\t}\n\n\t\t\t\tif ( !targetParentInserted ) {\n\t\t\t\t\tthis._markInsert( operation.targetPosition.parent, operation.getMovedRangeStart().offset, operation.howMany );\n\t\t\t\t}\n\n\t\t\t\tbreak;\n\t\t\t}\n\t\t\tcase 'rename': {\n\t\t\t\tif ( this._isInInsertedElement( operation.position.parent ) ) {\n\t\t\t\t\treturn;\n\t\t\t\t}\n\n\t\t\t\tthis._markRemove( operation.position.parent, operation.position.offset, 1 );\n\t\t\t\tthis._markInsert( operation.position.parent, operation.position.offset, 1 );\n\n\t\t\t\tconst range = Range._createFromPositionAndShift( operation.position, 1 );\n\n\t\t\t\tfor ( const marker of this._markerCollection.getMarkersIntersectingRange( range ) ) {\n\t\t\t\t\tconst markerRange = marker.getRange();\n\n\t\t\t\t\tthis.bufferMarkerChange( marker.name, markerRange, markerRange, marker.affectsData );\n\t\t\t\t}\n\n\t\t\t\tbreak;\n\t\t\t}\n\t\t\tcase 'split': {\n\t\t\t\tconst splitElement = operation.splitPosition.parent;\n\n\t\t\t\t// Mark that children of the split element were removed.\n\t\t\t\tif ( !this._isInInsertedElement( splitElement ) ) {\n\t\t\t\t\tthis._markRemove( splitElement, operation.splitPosition.offset, operation.howMany );\n\t\t\t\t}\n\n\t\t\t\t// Mark that the new element (split copy) was inserted.\n\t\t\t\tif ( !this._isInInsertedElement( operation.insertionPosition.parent ) ) {\n\t\t\t\t\tthis._markInsert( operation.insertionPosition.parent, operation.insertionPosition.offset, 1 );\n\t\t\t\t}\n\n\t\t\t\t// If the split took the element from the graveyard, mark that the element from the graveyard was removed.\n\t\t\t\tif ( operation.graveyardPosition ) {\n\t\t\t\t\tthis._markRemove( operation.graveyardPosition.parent, operation.graveyardPosition.offset, 1 );\n\t\t\t\t}\n\n\t\t\t\tbreak;\n\t\t\t}\n\t\t\tcase 'merge': {\n\t\t\t\t// Mark that the merged element was removed.\n\t\t\t\tconst mergedElement = operation.sourcePosition.parent;\n\n\t\t\t\tif ( !this._isInInsertedElement( mergedElement.parent ) ) {\n\t\t\t\t\tthis._markRemove( mergedElement.parent, mergedElement.startOffset, 1 );\n\t\t\t\t}\n\n\t\t\t\t// Mark that the merged element was inserted into graveyard.\n\t\t\t\tconst graveyardParent = operation.graveyardPosition.parent;\n\n\t\t\t\tthis._markInsert( graveyardParent, operation.graveyardPosition.offset, 1 );\n\n\t\t\t\t// Mark that children of merged element were inserted at new parent.\n\t\t\t\tconst mergedIntoElement = operation.targetPosition.parent;\n\n\t\t\t\tif ( !this._isInInsertedElement( mergedIntoElement ) ) {\n\t\t\t\t\tthis._markInsert( mergedIntoElement, operation.targetPosition.offset, mergedElement.maxOffset );\n\t\t\t\t}\n\n\t\t\t\tbreak;\n\t\t\t}\n\t\t}\n\n\t\t// Clear cache after each buffered operation as it is no longer valid.\n\t\tthis._cachedChanges = null;\n\t}\n\n\t/**\n\t * Buffers a marker change.\n\t *\n\t * @param {String} markerName The name of the marker that changed.\n\t * @param {module:engine/model/range~Range|null} oldRange Marker range before the change or `null` if the marker has just\n\t * been created.\n\t * @param {module:engine/model/range~Range|null} newRange Marker range after the change or `null` if the marker was removed.\n\t * @param {Boolean} affectsData Flag indicating whether marker affects the editor data.\n\t */\n\tbufferMarkerChange( markerName, oldRange, newRange, affectsData ) {\n\t\tconst buffered = this._changedMarkers.get( markerName );\n\n\t\tif ( !buffered ) {\n\t\t\tthis._changedMarkers.set( markerName, {\n\t\t\t\toldRange,\n\t\t\t\tnewRange,\n\t\t\t\taffectsData\n\t\t\t} );\n\t\t} else {\n\t\t\tbuffered.newRange = newRange;\n\t\t\tbuffered.affectsData = affectsData;\n\n\t\t\tif ( buffered.oldRange == null && buffered.newRange == null ) {\n\t\t\t\t// The marker is going to be removed (`newRange == null`) but it did not exist before the first buffered change\n\t\t\t\t// (`buffered.oldRange == null`). In this case, do not keep the marker in buffer at all.\n\t\t\t\tthis._changedMarkers.delete( markerName );\n\t\t\t}\n\t\t}\n\t}\n\n\t/**\n\t * Returns all markers that should be removed as a result of buffered changes.\n\t *\n\t * @returns {Array.<Object>} Markers to remove. Each array item is an object containing the `name` and `range` properties.\n\t */\n\tgetMarkersToRemove() {\n\t\tconst result = [];\n\n\t\tfor ( const [ name, change ] of this._changedMarkers ) {\n\t\t\tif ( change.oldRange != null ) {\n\t\t\t\tresult.push( { name, range: change.oldRange } );\n\t\t\t}\n\t\t}\n\n\t\treturn result;\n\t}\n\n\t/**\n\t * Returns all markers which should be added as a result of buffered changes.\n\t *\n\t * @returns {Array.<Object>} Markers to add. Each array item is an object containing the `name` and `range` properties.\n\t */\n\tgetMarkersToAdd() {\n\t\tconst result = [];\n\n\t\tfor ( const [ name, change ] of this._changedMarkers ) {\n\t\t\tif ( change.newRange != null ) {\n\t\t\t\tresult.push( { name, range: change.newRange } );\n\t\t\t}\n\t\t}\n\n\t\treturn result;\n\t}\n\n\t/**\n\t * Returns all markers which changed.\n\t *\n\t * @returns {Array.<Object>}\n\t */\n\tgetChangedMarkers() {\n\t\treturn Array.from( this._changedMarkers ).map( item => (\n\t\t\t{\n\t\t\t\tname: item[ 0 ],\n\t\t\t\tdata: {\n\t\t\t\t\toldRange: item[ 1 ].oldRange,\n\t\t\t\t\tnewRange: item[ 1 ].newRange\n\t\t\t\t}\n\t\t\t}\n\t\t) );\n\t}\n\n\t/**\n\t * Checks whether some of the buffered changes affect the editor data.\n\t *\n\t * Types of changes which affect the editor data:\n\t *\n\t * * model structure changes,\n\t * * attribute changes,\n\t * * changes of markers which were defined as `affectingData`.\n\t *\n\t * @returns {Boolean}\n\t */\n\thasDataChanges() {\n\t\tfor ( const [ , change ] of this._changedMarkers ) {\n\t\t\tif ( change.affectsData ) {\n\t\t\t\treturn true;\n\t\t\t}\n\t\t}\n\n\t\t// If markers do not affect the data, check whether there are some changes in elements.\n\t\treturn this._changesInElement.size > 0;\n\t}\n\n\t/**\n\t * Calculates the diff between the old model tree state (the state before the first buffered operations since the last {@link #reset}\n\t * call) and the new model tree state (actual one). It should be called after all buffered operations are executed.\n\t *\n\t * The diff set is returned as an array of diff items, each describing a change done on the model. The items are sorted by\n\t * the position on which the change happened. If a position {@link module:engine/model/position~Position#isBefore is before}\n\t * another one, it will be on an earlier index in the diff set.\n\t *\n\t * Because calculating the diff is a costly operation, the result is cached. If no new operation was buffered since the\n\t * previous {@link #getChanges} call, the next call will return the cached value.\n\t *\n\t * @param {Object} options Additional options.\n\t * @param {Boolean} [options.includeChangesInGraveyard=false] If set to `true`, also changes that happened\n\t * in the graveyard root will be returned. By default, changes in the graveyard root are not returned.\n\t * @returns {Array.<Object>} Diff between the old and the new model tree state.\n\t */\n\tgetChanges( options = { includeChangesInGraveyard: false } ) {\n\t\t// If there are cached changes, just return them instead of calculating changes again.\n\t\tif ( this._cachedChanges ) {\n\t\t\tif ( options.includeChangesInGraveyard ) {\n\t\t\t\treturn this._cachedChangesWithGraveyard.slice();\n\t\t\t} else {\n\t\t\t\treturn this._cachedChanges.slice();\n\t\t\t}\n\t\t}\n\n\t\t// Will contain returned results.\n\t\tconst diffSet = [];\n\n\t\t// Check all changed elements.\n\t\tfor ( const element of this._changesInElement.keys() ) {\n\t\t\t// Get changes for this element and sort them.\n\t\t\tconst changes = this._changesInElement.get( element ).sort( ( a, b ) => {\n\t\t\t\tif ( a.offset === b.offset ) {\n\t\t\t\t\tif ( a.type != b.type ) {\n\t\t\t\t\t\t// If there are multiple changes at the same position, \"remove\" change should be first.\n\t\t\t\t\t\t// If the order is different, for example, we would first add some nodes and then removed them\n\t\t\t\t\t\t// (instead of the nodes that we should remove).\n\t\t\t\t\t\treturn a.type == 'remove' ? -1 : 1;\n\t\t\t\t\t}\n\n\t\t\t\t\treturn 0;\n\t\t\t\t}\n\n\t\t\t\treturn a.offset < b.offset ? -1 : 1;\n\t\t\t} );\n\n\t\t\t// Get children of this element before any change was applied on it.\n\t\t\tconst snapshotChildren = this._elementSnapshots.get( element );\n\t\t\t// Get snapshot of current element's children.\n\t\t\tconst elementChildren = _getChildrenSnapshot( element.getChildren() );\n\n\t\t\t// Generate actions basing on changes done on element.\n\t\t\tconst actions = _generateActionsFromChanges( snapshotChildren.length, changes );\n\n\t\t\tlet i = 0; // Iterator in `elementChildren` array -- iterates through current children of element.\n\t\t\tlet j = 0; // Iterator in `snapshotChildren` array -- iterates through old children of element.\n\n\t\t\t// Process every action.\n\t\t\tfor ( const action of actions ) {\n\t\t\t\tif ( action === 'i' ) {\n\t\t\t\t\t// Generate diff item for this element and insert it into the diff set.\n\t\t\t\t\tdiffSet.push( this._getInsertDiff( element, i, elementChildren[ i ].name ) );\n\n\t\t\t\t\ti++;\n\t\t\t\t} else if ( action === 'r' ) {\n\t\t\t\t\t// Generate diff item for this element and insert it into the diff set.\n\t\t\t\t\tdiffSet.push( this._getRemoveDiff( element, i, snapshotChildren[ j ].name ) );\n\n\t\t\t\t\tj++;\n\t\t\t\t} else if ( action === 'a' ) {\n\t\t\t\t\t// Take attributes from saved and current children.\n\t\t\t\t\tconst elementAttributes = elementChildren[ i ].attributes;\n\t\t\t\t\tconst snapshotAttributes = snapshotChildren[ j ].attributes;\n\t\t\t\t\tlet range;\n\n\t\t\t\t\tif ( elementChildren[ i ].name == '$text' ) {\n\t\t\t\t\t\trange = new Range( Position._createAt( element, i ), Position._createAt( element, i + 1 ) );\n\t\t\t\t\t} else {\n\t\t\t\t\t\tconst index = element.offsetToIndex( i );\n\t\t\t\t\t\trange = new Range( Position._createAt( element, i ), Position._createAt( element.getChild( index ), 0 ) );\n\t\t\t\t\t}\n\n\t\t\t\t\t// Generate diff items for this change (there might be multiple attributes changed and\n\t\t\t\t\t// there is a single diff for each of them) and insert them into the diff set.\n\t\t\t\t\tdiffSet.push( ...this._getAttributesDiff( range, snapshotAttributes, elementAttributes ) );\n\n\t\t\t\t\ti++;\n\t\t\t\t\tj++;\n\t\t\t\t} else {\n\t\t\t\t\t// `action` is 'equal'. Child not changed.\n\t\t\t\t\ti++;\n\t\t\t\t\tj++;\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\n\t\t// Then, sort the changes by the position (change at position before other changes is first).\n\t\tdiffSet.sort( ( a, b ) => {\n\t\t\t// If the change is in different root, we don't care much, but we'd like to have all changes in given\n\t\t\t// root \"together\" in the array. So let's just sort them by the root name. It does not matter which root\n\t\t\t// will be processed first.\n\t\t\tif ( a.position.root != b.position.root ) {\n\t\t\t\treturn a.position.root.rootName < b.position.root.rootName ? -1 : 1;\n\t\t\t}\n\n\t\t\t// If change happens at the same position...\n\t\t\tif ( a.position.isEqual( b.position ) ) {\n\t\t\t\t// Keep chronological order of operations.\n\t\t\t\treturn a.changeCount - b.changeCount;\n\t\t\t}\n\n\t\t\t// If positions differ, position \"on the left\" should be earlier in the result.\n\t\t\treturn a.position.isBefore( b.position ) ? -1 : 1;\n\t\t} );\n\n\t\t// Glue together multiple changes (mostly on text nodes).\n\t\tfor ( let i = 1; i < diffSet.length; i++ ) {\n\t\t\tconst prevDiff = diffSet[ i - 1 ];\n\t\t\tconst thisDiff = diffSet[ i ];\n\n\t\t\t// Glue remove changes if they happen on text on same position.\n\t\t\tconst isConsecutiveTextRemove =\n\t\t\t\tprevDiff.type == 'remove' && thisDiff.type == 'remove' &&\n\t\t\t\tprevDiff.name == '$text' && thisDiff.name == '$text' &&\n\t\t\t\tprevDiff.position.isEqual( thisDiff.position );\n\n\t\t\t// Glue insert changes if they happen on text on consecutive fragments.\n\t\t\tconst isConsecutiveTextAdd =\n\t\t\t\tprevDiff.type == 'insert' && thisDiff.type == 'insert' &&\n\t\t\t\tprevDiff.name == '$text' && thisDiff.name == '$text' &&\n\t\t\t\tprevDiff.position.parent == thisDiff.position.parent &&\n\t\t\t\tprevDiff.position.offset + prevDiff.length == thisDiff.position.offset;\n\n\t\t\t// Glue attribute changes if they happen on consecutive fragments and have same key, old value and new value.\n\t\t\tconst isConsecutiveAttributeChange =\n\t\t\t\tprevDiff.type == 'attribute' && thisDiff.type == 'attribute' &&\n\t\t\t\tprevDiff.position.parent == thisDiff.position.parent &&\n\t\t\t\tprevDiff.range.isFlat && thisDiff.range.isFlat &&\n\t\t\t\tprevDiff.position.offset + prevDiff.length == thisDiff.position.offset &&\n\t\t\t\tprevDiff.attributeKey == thisDiff.attributeKey &&\n\t\t\t\tprevDiff.attributeOldValue == thisDiff.attributeOldValue &&\n\t\t\t\tprevDiff.attributeNewValue == thisDiff.attributeNewValue;\n\n\t\t\tif ( isConsecutiveTextRemove || isConsecutiveTextAdd || isConsecutiveAttributeChange ) {\n\t\t\t\tdiffSet[ i - 1 ].length++;\n\n\t\t\t\tif ( isConsecutiveAttributeChange ) {\n\t\t\t\t\tdiffSet[ i - 1 ].range.end = diffSet[ i - 1 ].range.end.getShiftedBy( 1 );\n\t\t\t\t}\n\n\t\t\t\tdiffSet.splice( i, 1 );\n\t\t\t\ti--;\n\t\t\t}\n\t\t}\n\n\t\t// Remove `changeCount` property from diff items. It is used only for sorting and is internal thing.\n\t\tfor ( const item of diffSet ) {\n\t\t\tdelete item.changeCount;\n\n\t\t\tif ( item.type == 'attribute' ) {\n\t\t\t\tdelete item.position;\n\t\t\t\tdelete item.length;\n\t\t\t}\n\t\t}\n\n\t\tthis._changeCount = 0;\n\n\t\t// Cache changes.\n\t\tthis._cachedChangesWithGraveyard = diffSet.slice();\n\t\tthis._cachedChanges = diffSet.slice().filter( _changesInGraveyardFilter );\n\n\t\tif ( options.includeChangesInGraveyard ) {\n\t\t\treturn this._cachedChangesWithGraveyard;\n\t\t} else {\n\t\t\treturn this._cachedChanges;\n\t\t}\n\t}\n\n\t/**\n\t * Resets `Differ`. Removes all buffered changes.\n\t */\n\treset() {\n\t\tthis._changesInElement.clear();\n\t\tthis._elementSnapshots.clear();\n\t\tthis._changedMarkers.clear();\n\t\tthis._cachedChanges = null;\n\t}\n\n\t/**\n\t * Saves and handles an insert change.\n\t *\n\t * @private\n\t * @param {module:engine/model/element~Element} parent\n\t * @param {Number} offset\n\t * @param {Number} howMany\n\t */\n\t_markInsert( parent, offset, howMany ) {\n\t\tconst changeItem = { type: 'insert', offset, howMany, count: this._changeCount++ };\n\n\t\tthis._markChange( parent, changeItem );\n\t}\n\n\t/**\n\t * Saves and handles a remove change.\n\t *\n\t * @private\n\t * @param {module:engine/model/element~Element} parent\n\t * @param {Number} offset\n\t * @param {Number} howMany\n\t */\n\t_markRemove( parent, offset, howMany ) {\n\t\tconst changeItem = { type: 'remove', offset, howMany, count: this._changeCount++ };\n\n\t\tthis._markChange( parent, changeItem );\n\n\t\tthis._removeAllNestedChanges( parent, offset, howMany );\n\t}\n\n\t/**\n\t * Saves and handles an attribute change.\n\t *\n\t * @private\n\t * @param {module:engine/model/item~Item} item\n\t */\n\t_markAttribute( item ) {\n\t\tconst changeItem = { type: 'attribute', offset: item.startOffset, howMany: item.offsetSize, count: this._changeCount++ };\n\n\t\tthis._markChange( item.parent, changeItem );\n\t}\n\n\t/**\n\t * Saves and handles a model change.\n\t *\n\t * @private\n\t * @param {module:engine/model/element~Element} parent\n\t * @param {Object} changeItem\n\t */\n\t_markChange( parent, changeItem ) {\n\t\t// First, make a snapshot of this parent's children (it will be made only if it was not made before).\n\t\tthis._makeSnapshot( parent );\n\n\t\t// Then, get all changes that already were done on the element (empty array if this is the first change).\n\t\tconst changes = this._getChangesForElement( parent );\n\n\t\t// Then, look through all the changes, and transform them or the new change.\n\t\tthis._handleChange( changeItem, changes );\n\n\t\t// Add the new change.\n\t\tchanges.push( changeItem );\n\n\t\t// Remove incorrect changes. During transformation some change might be, for example, included in another.\n\t\t// In that case, the change will have `howMany` property set to `0` or less. We need to remove those changes.\n\t\tfor ( let i = 0; i < changes.length; i++ ) {\n\t\t\tif ( changes[ i ].howMany < 1 ) {\n\t\t\t\tchanges.splice( i, 1 );\n\n\t\t\t\ti--;\n\t\t\t}\n\t\t}\n\t}\n\n\t/**\n\t * Gets an array of changes that have already been saved for a given element.\n\t *\n\t * @private\n\t * @param {module:engine/model/element~Element} element\n\t * @returns {Array.<Object>}\n\t */\n\t_getChangesForElement( element ) {\n\t\tlet changes;\n\n\t\tif ( this._changesInElement.has( element ) ) {\n\t\t\tchanges = this._changesInElement.get( element );\n\t\t} else {\n\t\t\tchanges = [];\n\n\t\t\tthis._changesInElement.set( element, changes );\n\t\t}\n\n\t\treturn changes;\n\t}\n\n\t/**\n\t * Saves a children snapshot for a given element.\n\t *\n\t * @private\n\t * @param {module:engine/model/element~Element} element\n\t */\n\t_makeSnapshot( element ) {\n\t\tif ( !this._elementSnapshots.has( element ) ) {\n\t\t\tthis._elementSnapshots.set( element, _getChildrenSnapshot( element.getChildren() ) );\n\t\t}\n\t}\n\n\t/**\n\t * For a given newly saved change, compares it with a change already done on the element and modifies the incoming\n\t * change and/or the old change.\n\t *\n\t * @private\n\t * @param {Object} inc Incoming (new) change.\n\t * @param {Array.<Object>} changes An array containing all the changes done on that element.\n\t */\n\t_handleChange( inc, changes ) {\n\t\t// We need a helper variable that will store how many nodes are to be still handled for this change item.\n\t\t// `nodesToHandle` (how many nodes still need to be handled) and `howMany` (how many nodes were affected)\n\t\t// needs to be differentiated.\n\t\t//\n\t\t// This comes up when there are multiple changes that are affected by `inc` change item.\n\t\t//\n\t\t// For example: assume two insert changes: `{ offset: 2, howMany: 1 }` and `{ offset: 5, howMany: 1 }`.\n\t\t// Assume that `inc` change is remove `{ offset: 2, howMany: 2, nodesToHandle: 2 }`.\n\t\t//\n\t\t// Then, we:\n\t\t// - \"forget\" about first insert change (it is \"eaten\" by remove),\n\t\t// - because of that, at the end we will want to remove only one node (`nodesToHandle = 1`),\n\t\t// - but still we have to change offset of the second insert change from `5` to `3`!\n\t\t//\n\t\t// So, `howMany` does not change throughout items transformation and keeps information about how many nodes were affected,\n\t\t// while `nodesToHandle` means how many nodes need to be handled after the change item is transformed by other changes.\n\t\tinc.nodesToHandle = inc.howMany;\n\n\t\tfor ( const old of changes ) {\n\t\t\tconst incEnd = inc.offset + inc.howMany;\n\t\t\tconst oldEnd = old.offset + old.howMany;\n\n\t\t\tif ( inc.type == 'insert' ) {\n\t\t\t\tif ( old.type == 'insert' ) {\n\t\t\t\t\tif ( inc.offset <= old.offset ) {\n\t\t\t\t\t\told.offset += inc.howMany;\n\t\t\t\t\t} else if ( inc.offset < oldEnd ) {\n\t\t\t\t\t\told.howMany += inc.nodesToHandle;\n\t\t\t\t\t\tinc.nodesToHandle = 0;\n\t\t\t\t\t}\n\t\t\t\t}\n\n\t\t\t\tif ( old.type == 'remove' ) {\n\t\t\t\t\tif ( inc.offset < old.offset ) {\n\t\t\t\t\t\told.offset += inc.howMany;\n\t\t\t\t\t}\n\t\t\t\t}\n\n\t\t\t\tif ( old.type == 'attribute' ) {\n\t\t\t\t\tif ( inc.offset <= old.offset ) {\n\t\t\t\t\t\told.offset += inc.howMany;\n\t\t\t\t\t} else if ( inc.offset < oldEnd ) {\n\t\t\t\t\t\t// This case is more complicated, because attribute change has to be split into two.\n\t\t\t\t\t\t// Example (assume that uppercase and lowercase letters mean different attributes):\n\t\t\t\t\t\t//\n\t\t\t\t\t\t// initial state:\t\tabcxyz\n\t\t\t\t\t\t// attribute change:\taBCXYz\n\t\t\t\t\t\t// incoming insert:\t\taBCfooXYz\n\t\t\t\t\t\t//\n\t\t\t\t\t\t// Change ranges cannot intersect because each item has to be described exactly (it was either\n\t\t\t\t\t\t// not changed, inserted, removed, or its attribute was changed). That's why old attribute\n\t\t\t\t\t\t// change has to be split and both parts has to be handled separately from now on.\n\t\t\t\t\t\tconst howMany = old.howMany;\n\n\t\t\t\t\t\told.howMany = inc.offset - old.offset;\n\n\t\t\t\t\t\t// Add the second part of attribute change to the beginning of processed array so it won't\n\t\t\t\t\t\t// be processed again in this loop.\n\t\t\t\t\t\tchanges.unshift( {\n\t\t\t\t\t\t\ttype: 'attribute',\n\t\t\t\t\t\t\toffset: incEnd,\n\t\t\t\t\t\t\thowMany: howMany - old.howMany,\n\t\t\t\t\t\t\tcount: this._changeCount++\n\t\t\t\t\t\t} );\n\t\t\t\t\t}\n\t\t\t\t}\n\t\t\t}\n\n\t\t\tif ( inc.type == 'remove' ) {\n\t\t\t\tif ( old.type == 'insert' ) {\n\t\t\t\t\tif ( incEnd <= old.offset ) {\n\t\t\t\t\t\told.offset -= inc.howMany;\n\t\t\t\t\t} else if ( incEnd <= oldEnd ) {\n\t\t\t\t\t\tif ( inc.offset < old.offset ) {\n\t\t\t\t\t\t\tconst intersectionLength = incEnd - old.offset;\n\n\t\t\t\t\t\t\told.offset = inc.offset;\n\n\t\t\t\t\t\t\told.howMany -= intersectionLength;\n\t\t\t\t\t\t\tinc.nodesToHandle -= intersectionLength;\n\t\t\t\t\t\t} else {\n\t\t\t\t\t\t\told.howMany -= inc.nodesToHandle;\n\t\t\t\t\t\t\tinc.nodesToHandle = 0;\n\t\t\t\t\t\t}\n\t\t\t\t\t} else {\n\t\t\t\t\t\tif ( inc.offset <= old.offset ) {\n\t\t\t\t\t\t\tinc.nodesToHandle -= old.howMany;\n\t\t\t\t\t\t\told.howMany = 0;\n\t\t\t\t\t\t} else if ( inc.offset < oldEnd ) {\n\t\t\t\t\t\t\tconst intersectionLength = oldEnd - inc.offset;\n\n\t\t\t\t\t\t\told.howMany -= intersectionLength;\n\t\t\t\t\t\t\tinc.nodesToHandle -= intersectionLength;\n\t\t\t\t\t\t}\n\t\t\t\t\t}\n\t\t\t\t}\n\n\t\t\t\tif ( old.type == 'remove' ) {\n\t\t\t\t\tif ( incEnd <= old.offset ) {\n\t\t\t\t\t\told.offset -= inc.howMany;\n\t\t\t\t\t} else if ( inc.offset < old.offset ) {\n\t\t\t\t\t\tinc.nodesToHandle += old.howMany;\n\t\t\t\t\t\told.howMany = 0;\n\t\t\t\t\t}\n\t\t\t\t}\n\n\t\t\t\tif ( old.type == 'attribute' ) {\n\t\t\t\t\tif ( incEnd <= old.offset ) {\n\t\t\t\t\t\told.offset -= inc.howMany;\n\t\t\t\t\t} else if ( inc.offset < old.offset ) {\n\t\t\t\t\t\tconst intersectionLength = incEnd - old.offset;\n\n\t\t\t\t\t\told.offset = inc.offset;\n\t\t\t\t\t\told.howMany -= intersectionLength;\n\t\t\t\t\t} else if ( inc.offset < oldEnd ) {\n\t\t\t\t\t\tif ( incEnd <= oldEnd ) {\n\t\t\t\t\t\t\t// On first sight in this case we don't need to split attribute operation into two.\n\t\t\t\t\t\t\t// However the changes set is later converted to actions (see `_generateActionsFromChanges`).\n\t\t\t\t\t\t\t// For that reason, no two changes may intersect.\n\t\t\t\t\t\t\t// So we cannot have an attribute change that \"contains\" remove change.\n\t\t\t\t\t\t\t// Attribute change needs to be split.\n\t\t\t\t\t\t\tconst howMany = old.howMany;\n\n\t\t\t\t\t\t\told.howMany = inc.offset - old.offset;\n\n\t\t\t\t\t\t\tconst howManyAfter = howMany - old.howMany - inc.nodesToHandle;\n\n\t\t\t\t\t\t\t// Add the second part of attribute change to the beginning of processed array so it won't\n\t\t\t\t\t\t\t// be processed again in this loop.\n\t\t\t\t\t\t\tchanges.unshift( {\n\t\t\t\t\t\t\t\ttype: 'attribute',\n\t\t\t\t\t\t\t\toffset: inc.offset,\n\t\t\t\t\t\t\t\thowMany: howManyAfter,\n\t\t\t\t\t\t\t\tcount: this._changeCount++\n\t\t\t\t\t\t\t} );\n\t\t\t\t\t\t} else {\n\t\t\t\t\t\t\told.howMany -= oldEnd - inc.offset;\n\t\t\t\t\t\t}\n\t\t\t\t\t}\n\t\t\t\t}\n\t\t\t}\n\n\t\t\tif ( inc.type == 'attribute' ) {\n\t\t\t\t// In case of attribute change, `howMany` should be kept same as `nodesToHandle`. It's not an error.\n\t\t\t\tif ( old.type == 'insert' ) {\n\t\t\t\t\tif ( inc.offset < old.offset && incEnd > old.offset ) {\n\t\t\t\t\t\tif ( incEnd > oldEnd ) {\n\t\t\t\t\t\t\t// This case is similar to a case described when incoming change was insert and old change was attribute.\n\t\t\t\t\t\t\t// See comment above.\n\t\t\t\t\t\t\t//\n\t\t\t\t\t\t\t// This time incoming change is attribute. We need to split incoming change in this case too.\n\t\t\t\t\t\t\t// However this time, the second part of the attribute change needs to be processed further\n\t\t\t\t\t\t\t// because there might be other changes that it collides with.\n\t\t\t\t\t\t\tconst attributePart = {\n\t\t\t\t\t\t\t\ttype: 'attribute',\n\t\t\t\t\t\t\t\toffset: oldEnd,\n\t\t\t\t\t\t\t\thowMany: incEnd - oldEnd,\n\t\t\t\t\t\t\t\tcount: this._changeCount++\n\t\t\t\t\t\t\t};\n\n\t\t\t\t\t\t\tthis._handleChange( attributePart, changes );\n\n\t\t\t\t\t\t\tchanges.push( attributePart );\n\t\t\t\t\t\t}\n\n\t\t\t\t\t\tinc.nodesToHandle = old.offset - inc.offset;\n\t\t\t\t\t\tinc.howMany = inc.nodesToHandle;\n\t\t\t\t\t} else if ( inc.offset >= old.offset && inc.offset < oldEnd ) {\n\t\t\t\t\t\tif ( incEnd > oldEnd ) {\n\t\t\t\t\t\t\tinc.nodesToHandle = incEnd - oldEnd;\n\t\t\t\t\t\t\tinc.offset = oldEnd;\n\t\t\t\t\t\t} else {\n\t\t\t\t\t\t\tinc.nodesToHandle = 0;\n\t\t\t\t\t\t}\n\t\t\t\t\t}\n\t\t\t\t}\n\n\t\t\t\tif ( old.type == 'remove' ) {\n\t\t\t\t\t// This is a case when attribute change \"contains\" remove change.\n\t\t\t\t\t// The attribute change needs to be split into two because changes cannot intersect.\n\t\t\t\t\tif ( inc.offset < old.offset && incEnd > old.offset ) {\n\t\t\t\t\t\tconst attributePart = {\n\t\t\t\t\t\t\ttype: 'attribute',\n\t\t\t\t\t\t\toffset: old.offset,\n\t\t\t\t\t\t\thowMany: incEnd - old.offset,\n\t\t\t\t\t\t\tcount: this._changeCount++\n\t\t\t\t\t\t};\n\n\t\t\t\t\t\tthis._handleChange( attributePart, changes );\n\n\t\t\t\t\t\tchanges.push( attributePart );\n\n\t\t\t\t\t\tinc.nodesToHandle = old.offset - inc.offset;\n\t\t\t\t\t\tinc.howMany = inc.nodesToHandle;\n\t\t\t\t\t}\n\t\t\t\t}\n\n\t\t\t\tif ( old.type == 'attribute' ) {\n\t\t\t\t\t// There are only two conflicting scenarios possible here:\n\t\t\t\t\tif ( inc.offset >= old.offset && incEnd <= oldEnd ) {\n\t\t\t\t\t\t// `old` change includes `inc` change, or they are the same.\n\t\t\t\t\t\tinc.nodesToHandle = 0;\n\t\t\t\t\t\tinc.howMany = 0;\n\t\t\t\t\t\tinc.offset = 0;\n\t\t\t\t\t} else if ( inc.offset <= old.offset && incEnd >= oldEnd ) {\n\t\t\t\t\t\t// `inc` change includes `old` change.\n\t\t\t\t\t\told.howMany = 0;\n\t\t\t\t\t}\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\n\t\tinc.howMany = inc.nodesToHandle;\n\t\tdelete inc.nodesToHandle;\n\t}\n\n\t/**\n\t * Returns an object with a single insert change description.\n\t *\n\t * @private\n\t * @param {module:engine/model/element~Element} parent The element in which the change happened.\n\t * @param {Number} offset The offset at which change happened.\n\t * @param {String} name The name of the removed element or `'$text'` for a character.\n\t * @returns {Object} The diff item.\n\t */\n\t_getInsertDiff( parent, offset, name ) {\n\t\treturn {\n\t\t\ttype: 'insert',\n\t\t\tposition: Position._createAt( parent, offset ),\n\t\t\tname,\n\t\t\tlength: 1,\n\t\t\tchangeCount: this._changeCount++\n\t\t};\n\t}\n\n\t/**\n\t * Returns an object with a single remove change description.\n\t *\n\t * @private\n\t * @param {module:engine/model/element~Element} parent The element in which change happened.\n\t * @param {Number} offset The offset at which change happened.\n\t * @param {String} name The name of the removed element or `'$text'` for a character.\n\t * @returns {Object} The diff item.\n\t */\n\t_getRemoveDiff( parent, offset, name ) {\n\t\treturn {\n\t\t\ttype: 'remove',\n\t\t\tposition: Position._createAt( parent, offset ),\n\t\t\tname,\n\t\t\tlength: 1,\n\t\t\tchangeCount: this._changeCount++\n\t\t};\n\t}\n\n\t/**\n\t * Returns an array of objects where each one is a single attribute change description.\n\t *\n\t * @private\n\t * @param {module:engine/model/range~Range} range The range where the change happened.\n\t * @param {Map} oldAttributes A map, map iterator or compatible object that contains attributes before the change.\n\t * @param {Map} newAttributes A map, map iterator or compatible object that contains attributes after the change.\n\t * @returns {Array.<Object>} An array containing one or more diff items.\n\t */\n\t_getAttributesDiff( range, oldAttributes, newAttributes ) {\n\t\t// Results holder.\n\t\tconst diffs = [];\n\n\t\t// Clone new attributes as we will be performing changes on this object.\n\t\tnewAttributes = new Map( newAttributes );\n\n\t\t// Look through old attributes.\n\t\tfor ( const [ key, oldValue ] of oldAttributes ) {\n\t\t\t// Check what is the new value of the attribute (or if it was removed).\n\t\t\tconst newValue = newAttributes.has( key ) ? newAttributes.get( key ) : null;\n\n\t\t\t// If values are different (or attribute was removed)...\n\t\t\tif ( newValue !== oldValue ) {\n\t\t\t\t// Add diff item.\n\t\t\t\tdiffs.push( {\n\t\t\t\t\ttype: 'attribute',\n\t\t\t\t\tposition: range.start,\n\t\t\t\t\trange: range.clone(),\n\t\t\t\t\tlength: 1,\n\t\t\t\t\tattributeKey: key,\n\t\t\t\t\tattributeOldValue: oldValue,\n\t\t\t\t\tattributeNewValue: newValue,\n\t\t\t\t\tchangeCount: this._changeCount++\n\t\t\t\t} );\n\t\t\t}\n\n\t\t\t// Prevent returning two diff items for the same change.\n\t\t\tnewAttributes.delete( key );\n\t\t}\n\n\t\t// Look through new attributes that weren't handled above.\n\t\tfor ( const [ key, newValue ] of newAttributes ) {\n\t\t\t// Each of them is a new attribute. Add diff item.\n\t\t\tdiffs.push( {\n\t\t\t\ttype: 'attribute',\n\t\t\t\tposition: range.start,\n\t\t\t\trange: range.clone(),\n\t\t\t\tlength: 1,\n\t\t\t\tattributeKey: key,\n\t\t\t\tattributeOldValue: null,\n\t\t\t\tattributeNewValue: newValue,\n\t\t\t\tchangeCount: this._changeCount++\n\t\t\t} );\n\t\t}\n\n\t\treturn diffs;\n\t}\n\n\t/**\n\t * Checks whether given element or any of its parents is an element that is buffered as an inserted element.\n\t *\n\t * @private\n\t * @param {module:engine/model/element~Element} element Element to check.\n\t * @returns {Boolean}\n\t */\n\t_isInInsertedElement( element ) {\n\t\tconst parent = element.parent;\n\n\t\tif ( !parent ) {\n\t\t\treturn false;\n\t\t}\n\n\t\tconst changes = this._changesInElement.get( parent );\n\t\tconst offset = element.startOffset;\n\n\t\tif ( changes ) {\n\t\t\tfor ( const change of changes ) {\n\t\t\t\tif ( change.type == 'insert' && offset >= change.offset && offset < change.offset + change.howMany ) {\n\t\t\t\t\treturn true;\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\n\t\treturn this._isInInsertedElement( parent );\n\t}\n\n\t/**\n\t * Removes deeply all buffered changes that are registered in elements from range specified by `parent`, `offset`\n\t * and `howMany`.\n\t *\n\t * @private\n\t * @param {module:engine/model/element~Element} parent\n\t * @param {Number} offset\n\t * @param {Number} howMany\n\t */\n\t_removeAllNestedChanges( parent, offset, howMany ) {\n\t\tconst range = new Range( Position._createAt( parent, offset ), Position._createAt( parent, offset + howMany ) );\n\n\t\tfor ( const item of range.getItems( { shallow: true } ) ) {\n\t\t\tif ( item.is( 'element' ) ) {\n\t\t\t\tthis._elementSnapshots.delete( item );\n\t\t\t\tthis._changesInElement.delete( item );\n\n\t\t\t\tthis._removeAllNestedChanges( item, 0, item.maxOffset );\n\t\t\t}\n\t\t}\n\t}\n}\n\n// Returns an array that is a copy of passed child list with the exception that text nodes are split to one or more\n// objects, each representing one character and attributes set on that character.\nfunction _getChildrenSnapshot( children ) {\n\tconst snapshot = [];\n\n\tfor ( const child of children ) {\n\t\tif ( child.is( '$text' ) ) {\n\t\t\tfor ( let i = 0; i < child.data.length; i++ ) {\n\t\t\t\tsnapshot.push( {\n\t\t\t\t\tname: '$text',\n\t\t\t\t\tattributes: new Map( child.getAttributes() )\n\t\t\t\t} );\n\t\t\t}\n\t\t} else {\n\t\t\tsnapshot.push( {\n\t\t\t\tname: child.name,\n\t\t\t\tattributes: new Map( child.getAttributes() )\n\t\t\t} );\n\t\t}\n\t}\n\n\treturn snapshot;\n}\n\n// Generates array of actions for given changes set.\n// It simulates what `diff` function does.\n// Generated actions are:\n// - 'e' for 'equal' - when item at that position did not change,\n// - 'i' for 'insert' - when item at that position was inserted,\n// - 'r' for 'remove' - when item at that position was removed,\n// - 'a' for 'attribute' - when item at that position has it attributes changed.\n//\n// Example (assume that uppercase letters have bold attribute, compare with function code):\n//\n// children before:\tfooBAR\n// children after:\tfoxybAR\n//\n// changes: type: remove, offset: 1, howMany: 1\n//\t\t\ttype: insert, offset: 2, howMany: 2\n//\t\t\ttype: attribute, offset: 4, howMany: 1\n//\n// expected actions: equal (f), remove (o), equal (o), insert (x), insert (y), attribute (b), equal (A), equal (R)\n//\n// steps taken by th script:\n//\n// 1. change = \"type: remove, offset: 1, howMany: 1\"; offset = 0; oldChildrenHandled = 0\n//    1.1 between this change and the beginning is one not-changed node, fill with one equal action, one old child has been handled\n//    1.2 this change removes one node, add one remove action\n//    1.3 change last visited `offset` to 1\n//    1.4 since an old child has been removed, one more old child has been handled\n//    1.5 actions at this point are: equal, remove\n//\n// 2. change = \"type: insert, offset: 2, howMany: 2\"; offset = 1; oldChildrenHandled = 2\n//    2.1 between this change and previous change is one not-changed node, add equal action, another one old children has been handled\n//    2.2 this change inserts two nodes, add two insert actions\n//    2.3 change last visited offset to the end of the inserted range, that is 4\n//    2.4 actions at this point are: equal, remove, equal, insert, insert\n//\n// 3. change = \"type: attribute, offset: 4, howMany: 1\"; offset = 4, oldChildrenHandled = 3\n//    3.1 between this change and previous change are no not-changed nodes\n//    3.2 this change changes one node, add one attribute action\n//    3.3 change last visited `offset` to the end of change range, that is 5\n//    3.4 since an old child has been changed, one more old child has been handled\n//    3.5 actions at this point are: equal, remove, equal, insert, insert, attribute\n//\n// 4. after loop oldChildrenHandled = 4, oldChildrenLength = 6 (fooBAR is 6 characters)\n//    4.1 fill up with two equal actions\n//\n// The result actions are: equal, remove, equal, insert, insert, attribute, equal, equal.\nfunction _generateActionsFromChanges( oldChildrenLength, changes ) {\n\tconst actions = [];\n\n\tlet offset = 0;\n\tlet oldChildrenHandled = 0;\n\n\t// Go through all buffered changes.\n\tfor ( const change of changes ) {\n\t\t// First, fill \"holes\" between changes with \"equal\" actions.\n\t\tif ( change.offset > offset ) {\n\t\t\tfor ( let i = 0; i < change.offset - offset; i++ ) {\n\t\t\t\tactions.push( 'e' );\n\t\t\t}\n\n\t\t\toldChildrenHandled += change.offset - offset;\n\t\t}\n\n\t\t// Then, fill up actions accordingly to change type.\n\t\tif ( change.type == 'insert' ) {\n\t\t\tfor ( let i = 0; i < change.howMany; i++ ) {\n\t\t\t\tactions.push( 'i' );\n\t\t\t}\n\n\t\t\t// The last handled offset is after inserted range.\n\t\t\toffset = change.offset + change.howMany;\n\t\t} else if ( change.type == 'remove' ) {\n\t\t\tfor ( let i = 0; i < change.howMany; i++ ) {\n\t\t\t\tactions.push( 'r' );\n\t\t\t}\n\n\t\t\t// The last handled offset is at the position where the nodes were removed.\n\t\t\toffset = change.offset;\n\t\t\t// We removed `howMany` old nodes, update `oldChildrenHandled`.\n\t\t\toldChildrenHandled += change.howMany;\n\t\t} else {\n\t\t\tactions.push( ...'a'.repeat( change.howMany ).split( '' ) );\n\n\t\t\t// The last handled offset is at the position after the changed range.\n\t\t\toffset = change.offset + change.howMany;\n\t\t\t// We changed `howMany` old nodes, update `oldChildrenHandled`.\n\t\t\toldChildrenHandled += change.howMany;\n\t\t}\n\t}\n\n\t// Fill \"equal\" actions at the end of actions set. Use `oldChildrenHandled` to see how many children\n\t// has not been changed / removed at the end of their parent.\n\tif ( oldChildrenHandled < oldChildrenLength ) {\n\t\tfor ( let i = 0; i < oldChildrenLength - oldChildrenHandled - offset; i++ ) {\n\t\t\tactions.push( 'e' );\n\t\t}\n\t}\n\n\treturn actions;\n}\n\n// Filter callback for Array.filter that filters out change entries that are in graveyard.\nfunction _changesInGraveyardFilter( entry ) {\n\tconst posInGy = entry.position && entry.position.root.rootName == '$graveyard';\n\tconst rangeInGy = entry.range && entry.range.root.rootName == '$graveyard';\n\n\treturn !posInGy && !rangeInGy;\n}\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module engine/model/history\n */\n\n/**\n * `History` keeps the track of all the operations applied to the {@link module:engine/model/document~Document document}.\n */\nexport default class History {\n\t/**\n\t * Creates an empty History instance.\n\t */\n\tconstructor() {\n\t\t/**\n\t\t * Operations added to the history.\n\t\t *\n\t\t * @protected\n\t\t * @member {Array.<module:engine/model/operation/operation~Operation>} module:engine/model/history~History#_operations\n\t\t */\n\t\tthis._operations = [];\n\n\t\t/**\n\t\t * Holds an information which {@link module:engine/model/operation/operation~Operation operation} undoes which\n\t\t * {@link module:engine/model/operation/operation~Operation operation}.\n\t\t *\n\t\t * Keys of the map are \"undoing operations\", that is operations that undone some other operations. For each key, the\n\t\t * value is an operation that has been undone by the \"undoing operation\".\n\t\t *\n\t\t * @private\n\t\t * @member {Map} module:engine/model/history~History#_undoPairs\n\t\t */\n\t\tthis._undoPairs = new Map();\n\n\t\t/**\n\t\t * Holds all undone operations.\n\t\t *\n\t\t * @private\n\t\t * @member {Set.<module:engine/model/operation/operation~Operation>} module:engine/model/history~History#_undoneOperations\n\t\t */\n\t\tthis._undoneOperations = new Set();\n\t}\n\n\t/**\n\t * Adds an operation to the history.\n\t *\n\t * @param {module:engine/model/operation/operation~Operation} operation Operation to add.\n\t */\n\taddOperation( operation ) {\n\t\tif ( this._operations.includes( operation ) ) {\n\t\t\treturn;\n\t\t}\n\n\t\tthis._operations.push( operation );\n\t}\n\n\t/**\n\t * Returns operations added to the history.\n\t *\n\t * @param {Number} [from=Number.NEGATIVE_INFINITY] Base version from which operations should be returned (inclusive).\n\t * Defaults to `Number.NEGATIVE_INFINITY`, which means that operations from the first one will be returned.\n\t * @param {Number} [to=Number.POSITIVE_INFINITY] Base version up to which operations should be returned (exclusive).\n\t * Defaults to `Number.POSITIVE_INFINITY` which means that operations up to the last one will be returned.\n\t * @returns {Array.<module:engine/model/operation/operation~Operation>} Operations added to the history.\n\t */\n\tgetOperations( from = Number.NEGATIVE_INFINITY, to = Number.POSITIVE_INFINITY ) {\n\t\tconst operations = [];\n\n\t\tfor ( const operation of this._operations ) {\n\t\t\tif ( operation.baseVersion >= from && operation.baseVersion < to ) {\n\t\t\t\toperations.push( operation );\n\t\t\t}\n\t\t}\n\n\t\treturn operations;\n\t}\n\n\t/**\n\t * Returns operation from the history that bases on given `baseVersion`.\n\t *\n\t * @param {Number} baseVersion Base version of the operation to get.\n\t * @returns {module:engine/model/operation/operation~Operation|undefined} Operation with given base version or `undefined` if\n\t * there is no such operation in history.\n\t */\n\tgetOperation( baseVersion ) {\n\t\tfor ( const operation of this._operations ) {\n\t\t\tif ( operation.baseVersion == baseVersion ) {\n\t\t\t\treturn operation;\n\t\t\t}\n\t\t}\n\t}\n\n\t/**\n\t * Marks in history that one operation is an operation that is undoing the other operation. By marking operation this way,\n\t * history is keeping more context information about operations, which helps in operational transformation.\n\t *\n\t * @param {module:engine/model/operation/operation~Operation} undoneOperation Operation which is undone by `undoingOperation`.\n\t * @param {module:engine/model/operation/operation~Operation} undoingOperation Operation which undoes `undoneOperation`.\n\t */\n\tsetOperationAsUndone( undoneOperation, undoingOperation ) {\n\t\tthis._undoPairs.set( undoingOperation, undoneOperation );\n\t\tthis._undoneOperations.add( undoneOperation );\n\t}\n\n\t/**\n\t * Checks whether given `operation` is undoing any other operation.\n\t *\n\t * @param {module:engine/model/operation/operation~Operation} operation Operation to check.\n\t * @returns {Boolean} `true` if given `operation` is undoing any other operation, `false` otherwise.\n\t */\n\tisUndoingOperation( operation ) {\n\t\treturn this._undoPairs.has( operation );\n\t}\n\n\t/**\n\t * Checks whether given `operation` has been undone by any other operation.\n\t *\n\t * @param {module:engine/model/operation/operation~Operation} operation Operation to check.\n\t * @returns {Boolean} `true` if given `operation` has been undone any other operation, `false` otherwise.\n\t */\n\tisUndoneOperation( operation ) {\n\t\treturn this._undoneOperations.has( operation );\n\t}\n\n\t/**\n\t * For given `undoingOperation`, returns the operation which has been undone by it.\n\t *\n\t * @param {module:engine/model/operation/operation~Operation} undoingOperation\n\t * @returns {module:engine/model/operation/operation~Operation|undefined} Operation that has been undone by given\n\t * `undoingOperation` or `undefined` if given `undoingOperation` is not undoing any other operation.\n\t */\n\tgetUndoneOperation( undoingOperation ) {\n\t\treturn this._undoPairs.get( undoingOperation );\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * Set of utils to handle unicode characters.\n *\n * @module utils/unicode\n */\n\n/**\n * Checks whether given `character` is a combining mark.\n *\n * @param {String} character Character to check.\n * @returns {Boolean}\n */\nexport function isCombiningMark( character ) {\n\t// eslint-disable-next-line no-misleading-character-class\n\treturn !!character && character.length == 1 && /[\\u0300-\\u036f\\u1ab0-\\u1aff\\u1dc0-\\u1dff\\u20d0-\\u20ff\\ufe20-\\ufe2f]/.test( character );\n}\n\n/**\n * Checks whether given `character` is a high half of surrogate pair.\n *\n * Using UTF-16 terminology, a surrogate pair denotes UTF-16 character using two UTF-8 characters. The surrogate pair\n * consist of high surrogate pair character followed by low surrogate pair character.\n *\n * @param {String} character Character to check.\n * @returns {Boolean}\n */\nexport function isHighSurrogateHalf( character ) {\n\treturn !!character && character.length == 1 && /[\\ud800-\\udbff]/.test( character );\n}\n\n/**\n * Checks whether given `character` is a low half of surrogate pair.\n *\n * Using UTF-16 terminology, a surrogate pair denotes UTF-16 character using two UTF-8 characters. The surrogate pair\n * consist of high surrogate pair character followed by low surrogate pair character.\n *\n * @param {String} character Character to check.\n * @returns {Boolean}\n */\nexport function isLowSurrogateHalf( character ) {\n\treturn !!character && character.length == 1 && /[\\udc00-\\udfff]/.test( character );\n}\n\n/**\n * Checks whether given offset in a string is inside a surrogate pair (between two surrogate halves).\n *\n * @param {String} string String to check.\n * @param {Number} offset Offset to check.\n * @returns {Boolean}\n */\nexport function isInsideSurrogatePair( string, offset ) {\n\treturn isHighSurrogateHalf( string.charAt( offset - 1 ) ) && isLowSurrogateHalf( string.charAt( offset ) );\n}\n\n/**\n * Checks whether given offset in a string is between base character and combining mark or between two combining marks.\n *\n * @param {String} string String to check.\n * @param {Number} offset Offset to check.\n * @returns {Boolean}\n */\nexport function isInsideCombinedSymbol( string, offset ) {\n\treturn isCombiningMark( string.charAt( offset ) );\n}\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module engine/model/document\n */\n\nimport Differ from './differ';\nimport RootElement from './rootelement';\nimport History from './history';\nimport DocumentSelection from './documentselection';\nimport Collection from '@ckeditor/ckeditor5-utils/src/collection';\nimport EmitterMixin from '@ckeditor/ckeditor5-utils/src/emittermixin';\nimport CKEditorError from '@ckeditor/ckeditor5-utils/src/ckeditorerror';\nimport mix from '@ckeditor/ckeditor5-utils/src/mix';\nimport { isInsideSurrogatePair, isInsideCombinedSymbol } from '@ckeditor/ckeditor5-utils/src/unicode';\nimport { clone } from 'lodash-es';\n\n// @if CK_DEBUG_ENGINE // const { logDocument } = require( '../dev-utils/utils' );\n\nconst graveyardName = '$graveyard';\n\n/**\n * Data model's document. It contains the model's structure, its selection and the history of changes.\n *\n * Read more about working with the model in\n * {@glink framework/guides/architecture/editing-engine#model introduction to the the editing engine's architecture}.\n *\n * Usually, the document contains just one {@link module:engine/model/document~Document#roots root element}, so\n * you can retrieve it by just calling {@link module:engine/model/document~Document#getRoot} without specifying its name:\n *\n *\t\tmodel.document.getRoot(); // -> returns the main root\n *\n * However, the document may contain multiple roots – e.g. when the editor has multiple editable areas\n * (e.g. a title and a body of a message).\n *\n * @mixes module:utils/emittermixin~EmitterMixin\n */\nexport default class Document {\n\t/**\n\t * Creates an empty document instance with no {@link #roots} (other than\n\t * the {@link #graveyard graveyard root}).\n\t */\n\tconstructor( model ) {\n\t\t/**\n\t\t * The {@link module:engine/model/model~Model model} that the document is a part of.\n\t\t *\n\t\t * @readonly\n\t\t * @type {module:engine/model/model~Model}\n\t\t */\n\t\tthis.model = model;\n\n\t\t/**\n\t\t * The document version. It starts from `0` and every operation increases the version number. It is used to ensure that\n\t\t * operations are applied on a proper document version.\n\t\t *\n\t\t * If the {@link module:engine/model/operation/operation~Operation#baseVersion base version} does not match the document version,\n\t\t * a {@link module:utils/ckeditorerror~CKEditorError model-document-applyoperation-wrong-version} error is thrown.\n\t\t *\n\t\t * @type {Number}\n\t\t */\n\t\tthis.version = 0;\n\n\t\t/**\n\t\t * The document's history.\n\t\t *\n\t\t * @readonly\n\t\t * @type {module:engine/model/history~History}\n\t\t */\n\t\tthis.history = new History( this );\n\n\t\t/**\n\t\t * The selection in this document.\n\t\t *\n\t\t * @readonly\n\t\t * @type {module:engine/model/documentselection~DocumentSelection}\n\t\t */\n\t\tthis.selection = new DocumentSelection( this );\n\n\t\t/**\n\t\t * A list of roots that are owned and managed by this document. Use {@link #createRoot} and\n\t\t * {@link #getRoot} to manipulate it.\n\t\t *\n\t\t * @readonly\n\t\t * @type {module:utils/collection~Collection}\n\t\t */\n\t\tthis.roots = new Collection( { idProperty: 'rootName' } );\n\n\t\t/**\n\t\t * The model differ object. Its role is to buffer changes done on the model document and then calculate a diff of those changes.\n\t\t *\n\t\t * @readonly\n\t\t * @type {module:engine/model/differ~Differ}\n\t\t */\n\t\tthis.differ = new Differ( model.markers );\n\n\t\t/**\n\t\t * Post-fixer callbacks registered to the model document.\n\t\t *\n\t\t * @private\n\t\t * @type {Set.<Function>}\n\t\t */\n\t\tthis._postFixers = new Set();\n\n\t\t/**\n\t\t * A boolean indicates whether the selection has changed until\n\t\t *\n\t\t * @private\n\t\t * @type {Boolean}\n\t\t */\n\t\tthis._hasSelectionChangedFromTheLastChangeBlock = false;\n\n\t\t// Graveyard tree root. Document always have a graveyard root, which stores removed nodes.\n\t\tthis.createRoot( '$root', graveyardName );\n\n\t\t// First, if the operation is a document operation check if it's base version is correct.\n\t\tthis.listenTo( model, 'applyOperation', ( evt, args ) => {\n\t\t\tconst operation = args[ 0 ];\n\n\t\t\tif ( operation.isDocumentOperation && operation.baseVersion !== this.version ) {\n\t\t\t\t/**\n\t\t\t\t * Only operations with matching versions can be applied.\n\t\t\t\t *\n\t\t\t\t * @error model-document-applyoperation-wrong-version\n\t\t\t\t * @param {module:engine/model/operation/operation~Operation} operation\n\t\t\t\t */\n\t\t\t\tthrow new CKEditorError( 'model-document-applyoperation-wrong-version', this, { operation } );\n\t\t\t}\n\t\t}, { priority: 'highest' } );\n\n\t\t// Then, still before an operation is applied on model, buffer the change in differ.\n\t\tthis.listenTo( model, 'applyOperation', ( evt, args ) => {\n\t\t\tconst operation = args[ 0 ];\n\n\t\t\tif ( operation.isDocumentOperation ) {\n\t\t\t\tthis.differ.bufferOperation( operation );\n\t\t\t}\n\t\t}, { priority: 'high' } );\n\n\t\t// After the operation is applied, bump document's version and add the operation to the history.\n\t\tthis.listenTo( model, 'applyOperation', ( evt, args ) => {\n\t\t\tconst operation = args[ 0 ];\n\n\t\t\tif ( operation.isDocumentOperation ) {\n\t\t\t\tthis.version++;\n\t\t\t\tthis.history.addOperation( operation );\n\t\t\t}\n\t\t}, { priority: 'low' } );\n\n\t\t// Listen to selection changes. If selection changed, mark it.\n\t\tthis.listenTo( this.selection, 'change', () => {\n\t\t\tthis._hasSelectionChangedFromTheLastChangeBlock = true;\n\t\t} );\n\n\t\t// Buffer marker changes.\n\t\t// This is not covered in buffering operations because markers may change outside of them (when they\n\t\t// are modified using `model.markers` collection, not through `MarkerOperation`).\n\t\tthis.listenTo( model.markers, 'update', ( evt, marker, oldRange, newRange ) => {\n\t\t\t// Whenever marker is updated, buffer that change.\n\t\t\tthis.differ.bufferMarkerChange( marker.name, oldRange, newRange, marker.affectsData );\n\n\t\t\tif ( oldRange === null ) {\n\t\t\t\t// If this is a new marker, add a listener that will buffer change whenever marker changes.\n\t\t\t\tmarker.on( 'change', ( evt, oldRange ) => {\n\t\t\t\t\tthis.differ.bufferMarkerChange( marker.name, oldRange, marker.getRange(), marker.affectsData );\n\t\t\t\t} );\n\t\t\t}\n\t\t} );\n\t}\n\n\t/**\n\t * The graveyard tree root. A document always has a graveyard root that stores removed nodes.\n\t *\n\t * @readonly\n\t * @member {module:engine/model/rootelement~RootElement}\n\t */\n\tget graveyard() {\n\t\treturn this.getRoot( graveyardName );\n\t}\n\n\t/**\n\t * Creates a new root.\n\t *\n\t * @param {String} [elementName='$root'] The element name. Defaults to `'$root'` which also has some basic schema defined\n\t * (`$block`s are allowed inside the `$root`). Make sure to define a proper schema if you use a different name.\n\t * @param {String} [rootName='main'] A unique root name.\n\t * @returns {module:engine/model/rootelement~RootElement} The created root.\n\t */\n\tcreateRoot( elementName = '$root', rootName = 'main' ) {\n\t\tif ( this.roots.get( rootName ) ) {\n\t\t\t/**\n\t\t\t * A root with the specified name already exists.\n\t\t\t *\n\t\t\t * @error model-document-createroot-name-exists\n\t\t\t * @param {module:engine/model/document~Document} doc\n\t\t\t * @param {String} name\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'model-document-createroot-name-exists', this, { name: rootName } );\n\t\t}\n\n\t\tconst root = new RootElement( this, elementName, rootName );\n\t\tthis.roots.add( root );\n\n\t\treturn root;\n\t}\n\n\t/**\n\t * Removes all event listeners set by the document instance.\n\t */\n\tdestroy() {\n\t\tthis.selection.destroy();\n\t\tthis.stopListening();\n\t}\n\n\t/**\n\t * Returns a root by its name.\n\t *\n\t * @param {String} [name='main'] A unique root name.\n\t * @returns {module:engine/model/rootelement~RootElement|null} The root registered under a given name or `null` when\n\t * there is no root with the given name.\n\t */\n\tgetRoot( name = 'main' ) {\n\t\treturn this.roots.get( name );\n\t}\n\n\t/**\n\t * Returns an array with names of all roots (without the {@link #graveyard}) added to the document.\n\t *\n\t * @returns {Array.<String>} Roots names.\n\t */\n\tgetRootNames() {\n\t\treturn Array.from( this.roots, root => root.rootName ).filter( name => name != graveyardName );\n\t}\n\n\t/**\n\t * Used to register a post-fixer callback. A post-fixer mechanism guarantees that the features\n\t * will operate on a correct model state.\n\t *\n\t * An execution of a feature may lead to an incorrect document tree state. The callbacks are used to fix the document tree after\n\t * it has changed. Post-fixers are fired just after all changes from the outermost change block were applied but\n\t * before the {@link module:engine/model/document~Document#event:change change event} is fired. If a post-fixer callback made\n\t * a change, it should return `true`. When this happens, all post-fixers are fired again to check if something else should\n\t * not be fixed in the new document tree state.\n\t *\n\t * As a parameter, a post-fixer callback receives a {@link module:engine/model/writer~Writer writer} instance connected with the\n\t * executed changes block. Thanks to that, all changes done by the callback will be added to the same\n\t * {@link module:engine/model/batch~Batch batch} (and undo step) as the original changes. This makes post-fixer changes transparent\n\t * for the user.\n\t *\n\t * An example of a post-fixer is a callback that checks if all the data were removed from the editor. If so, the\n\t * callback should add an empty paragraph so that the editor is never empty:\n\t *\n\t *\t\tdocument.registerPostFixer( writer => {\n\t *\t\t\tconst changes = document.differ.getChanges();\n\t *\n\t *\t\t\t// Check if the changes lead to an empty root in the editor.\n\t *\t\t\tfor ( const entry of changes ) {\n\t *\t\t\t\tif ( entry.type == 'remove' && entry.position.root.isEmpty ) {\n\t *\t\t\t\t\twriter.insertElement( 'paragraph', entry.position.root, 0 );\n\t *\n\t *\t\t\t\t\t// It is fine to return early, even if multiple roots would need to be fixed.\n\t *\t\t\t\t\t// All post-fixers will be fired again, so if there are more empty roots, those will be fixed, too.\n\t *\t\t\t\t\treturn true;\n\t *\t\t\t\t}\n\t *\t\t\t}\n\t *\t\t} );\n\t *\n\t * @param {Function} postFixer\n\t */\n\tregisterPostFixer( postFixer ) {\n\t\tthis._postFixers.add( postFixer );\n\t}\n\n\t/**\n\t * A custom `toJSON()` method to solve child-parent circular dependencies.\n\t *\n\t * @returns {Object} A clone of this object with the document property changed to a string.\n\t */\n\ttoJSON() {\n\t\tconst json = clone( this );\n\n\t\t// Due to circular references we need to remove parent reference.\n\t\tjson.selection = '[engine.model.DocumentSelection]';\n\t\tjson.model = '[engine.model.Model]';\n\n\t\treturn json;\n\t}\n\n\t/**\n\t * Check if there were any changes done on document, and if so, call post-fixers,\n\t * fire `change` event for features and conversion and then reset the differ.\n\t * Fire `change:data` event when at least one operation or buffered marker changes the data.\n\t *\n\t * @protected\n\t * @fires change\n\t * @fires change:data\n\t * @param {module:engine/model/writer~Writer} writer The writer on which post-fixers will be called.\n\t */\n\t_handleChangeBlock( writer ) {\n\t\tif ( this._hasDocumentChangedFromTheLastChangeBlock() ) {\n\t\t\tthis._callPostFixers( writer );\n\n\t\t\t// Refresh selection attributes according to the final position in the model after the change.\n\t\t\tthis.selection.refresh();\n\n\t\t\tif ( this.differ.hasDataChanges() ) {\n\t\t\t\tthis.fire( 'change:data', writer.batch );\n\t\t\t} else {\n\t\t\t\tthis.fire( 'change', writer.batch );\n\t\t\t}\n\n\t\t\t// Theoretically, it is not necessary to refresh selection after change event because\n\t\t\t// post-fixers are the last who should change the model, but just in case...\n\t\t\tthis.selection.refresh();\n\n\t\t\tthis.differ.reset();\n\t\t}\n\n\t\tthis._hasSelectionChangedFromTheLastChangeBlock = false;\n\t}\n\n\t/**\n\t * Returns whether there is a buffered change or if the selection has changed from the last\n\t * {@link module:engine/model/model~Model#enqueueChange `enqueueChange()` block}\n\t * or {@link module:engine/model/model~Model#change `change()` block}.\n\t *\n\t * @protected\n\t * @returns {Boolean} Returns `true` if document has changed from the last `change()` or `enqueueChange()` block.\n\t */\n\t_hasDocumentChangedFromTheLastChangeBlock() {\n\t\treturn !this.differ.isEmpty || this._hasSelectionChangedFromTheLastChangeBlock;\n\t}\n\n\t/**\n\t * Returns the default root for this document which is either the first root that was added to the document using\n\t * {@link #createRoot} or the {@link #graveyard graveyard root} if no other roots were created.\n\t *\n\t * @protected\n\t * @returns {module:engine/model/rootelement~RootElement} The default root for this document.\n\t */\n\t_getDefaultRoot() {\n\t\tfor ( const root of this.roots ) {\n\t\t\tif ( root !== this.graveyard ) {\n\t\t\t\treturn root;\n\t\t\t}\n\t\t}\n\n\t\treturn this.graveyard;\n\t}\n\n\t/**\n\t * Returns the default range for this selection. The default range is a collapsed range that starts and ends\n\t * at the beginning of this selection's document {@link #_getDefaultRoot default root}.\n\t *\n\t * @protected\n\t * @returns {module:engine/model/range~Range}\n\t */\n\t_getDefaultRange() {\n\t\tconst defaultRoot = this._getDefaultRoot();\n\t\tconst model = this.model;\n\t\tconst schema = model.schema;\n\n\t\t// Find the first position where the selection can be put.\n\t\tconst position = model.createPositionFromPath( defaultRoot, [ 0 ] );\n\t\tconst nearestRange = schema.getNearestSelectionRange( position );\n\n\t\t// If valid selection range is not found - return range collapsed at the beginning of the root.\n\t\treturn nearestRange || model.createRange( position );\n\t}\n\n\t/**\n\t * Checks whether a given {@link module:engine/model/range~Range range} is a valid range for\n\t * the {@link #selection document's selection}.\n\t *\n\t * @private\n\t * @param {module:engine/model/range~Range} range A range to check.\n\t * @returns {Boolean} `true` if `range` is valid, `false` otherwise.\n\t */\n\t_validateSelectionRange( range ) {\n\t\treturn validateTextNodePosition( range.start ) && validateTextNodePosition( range.end );\n\t}\n\n\t/**\n\t * Performs post-fixer loops. Executes post-fixer callbacks as long as none of them has done any changes to the model.\n\t *\n\t * @private\n\t * @param {module:engine/model/writer~Writer} writer The writer on which post-fixer callbacks will be called.\n\t */\n\t_callPostFixers( writer ) {\n\t\tlet wasFixed = false;\n\n\t\tdo {\n\t\t\tfor ( const callback of this._postFixers ) {\n\t\t\t\t// Ensure selection attributes are up to date before each post-fixer.\n\t\t\t\t// https://github.com/ckeditor/ckeditor5-engine/issues/1673.\n\t\t\t\t//\n\t\t\t\t// It might be good to refresh the selection after each operation but at the moment it leads\n\t\t\t\t// to losing attributes for composition or and spell checking\n\t\t\t\t// https://github.com/ckeditor/ckeditor5-typing/issues/188\n\t\t\t\tthis.selection.refresh();\n\n\t\t\t\twasFixed = callback( writer );\n\n\t\t\t\tif ( wasFixed ) {\n\t\t\t\t\tbreak;\n\t\t\t\t}\n\t\t\t}\n\t\t} while ( wasFixed );\n\t}\n\n\t/**\n\t * Fired after each {@link module:engine/model/model~Model#enqueueChange `enqueueChange()` block} or the outermost\n\t * {@link module:engine/model/model~Model#change `change()` block} was executed and the document was changed\n\t * during that block's execution.\n\t *\n\t * The changes which this event will cover include:\n\t *\n\t * * document structure changes,\n\t * * selection changes,\n\t * * marker changes.\n\t *\n\t * If you want to be notified about all these changes, then simply listen to this event like this:\n\t *\n\t *\t\tmodel.document.on( 'change', () => {\n\t *\t\t\tconsole.log( 'The document has changed!' );\n\t *\t\t} );\n\t *\n\t * If, however, you only want to be notified about the data changes, then use the\n\t * {@link module:engine/model/document~Document#event:change:data change:data} event,\n\t * which is fired for document structure changes and marker changes (which affects the data).\n\t *\n\t *\t\tmodel.document.on( 'change:data', () => {\n\t *\t\t\tconsole.log( 'The data has changed!' );\n\t *\t\t} );\n\t *\n\t * @event change\n\t * @param {module:engine/model/batch~Batch} batch The batch that was used in the executed changes block.\n\t */\n\n\t/**\n\t * It is a narrower version of the {@link #event:change} event. It is fired for changes which\n\t * affect the editor data. This is:\n\t *\n\t * * document structure changes,\n\t * * marker changes (which affects the data).\n\t *\n\t * If you want to be notified about the data changes, then listen to this event:\n\t *\n\t *\t\tmodel.document.on( 'change:data', () => {\n\t *\t\t\tconsole.log( 'The data has changed!' );\n\t *\t\t} );\n\t *\n\t * If you would like to listen to all document changes, then check out the\n\t * {@link module:engine/model/document~Document#event:change change} event.\n\t *\n\t * @event change:data\n\t * @param {module:engine/model/batch~Batch} batch The batch that was used in the executed changes block.\n\t */\n\n\t// @if CK_DEBUG_ENGINE // log( version = null ) {\n\t// @if CK_DEBUG_ENGINE // \tversion = version === null ? this.version : version;\n\t// @if CK_DEBUG_ENGINE // \tlogDocument( this, version );\n\t// @if CK_DEBUG_ENGINE // }\n}\n\nmix( Document, EmitterMixin );\n\n// Checks whether given range boundary position is valid for document selection, meaning that is not between\n// unicode surrogate pairs or base character and combining marks.\nfunction validateTextNodePosition( rangeBoundary ) {\n\tconst textNode = rangeBoundary.textNode;\n\n\tif ( textNode ) {\n\t\tconst data = textNode.data;\n\t\tconst offset = rangeBoundary.offset - textNode.startOffset;\n\n\t\treturn !isInsideSurrogatePair( data, offset ) && !isInsideCombinedSymbol( data, offset );\n\t}\n\n\treturn true;\n}\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module engine/model/markercollection\n */\n\nimport LiveRange from './liverange';\nimport EmitterMixin from '@ckeditor/ckeditor5-utils/src/emittermixin';\nimport CKEditorError from '@ckeditor/ckeditor5-utils/src/ckeditorerror';\nimport mix from '@ckeditor/ckeditor5-utils/src/mix';\n\n/**\n * The collection of all {@link module:engine/model/markercollection~Marker markers} attached to the document.\n * It lets you {@link module:engine/model/markercollection~MarkerCollection#get get} markers or track them using\n * {@link module:engine/model/markercollection~MarkerCollection#event:update} event.\n *\n * To create, change or remove makers use {@link module:engine/model/writer~Writer model writers'} methods:\n * {@link module:engine/model/writer~Writer#addMarker} or {@link module:engine/model/writer~Writer#removeMarker}. Since\n * the writer is the only proper way to change the data model it is not possible to change markers directly using this\n * collection. All markers created by the writer will be automatically added to this collection.\n *\n * By default there is one marker collection available as {@link module:engine/model/model~Model#markers model property}.\n *\n * @see module:engine/model/markercollection~Marker\n */\nexport default class MarkerCollection {\n\t/**\n\t * Creates a markers collection.\n\t */\n\tconstructor() {\n\t\t/**\n\t\t * Stores {@link ~Marker markers} added to the collection.\n\t\t *\n\t\t * @private\n\t\t * @member {Map} #_markers\n\t\t */\n\t\tthis._markers = new Map();\n\t}\n\n\t/**\n\t * Iterable interface.\n\t *\n\t * Iterates over all {@link ~Marker markers} added to the collection.\n\t *\n\t * @returns {Iterable}\n\t */\n\t[ Symbol.iterator ]() {\n\t\treturn this._markers.values();\n\t}\n\n\t/**\n\t * Checks if marker with given `markerName` is in the collection.\n\t *\n\t * @param {String} markerName Marker name.\n\t * @returns {Boolean} `true` if marker with given `markerName` is in the collection, `false` otherwise.\n\t */\n\thas( markerName ) {\n\t\treturn this._markers.has( markerName );\n\t}\n\n\t/**\n\t * Returns {@link ~Marker marker} with given `markerName`.\n\t *\n\t * @param {String} markerName Name of marker to get.\n\t * @returns {module:engine/model/markercollection~Marker|null} Marker with given name or `null` if such marker was\n\t * not added to the collection.\n\t */\n\tget( markerName ) {\n\t\treturn this._markers.get( markerName ) || null;\n\t}\n\n\t/**\n\t * Creates and adds a {@link ~Marker marker} to the `MarkerCollection` with given name on given\n\t * {@link module:engine/model/range~Range range}.\n\t *\n\t * If `MarkerCollection` already had a marker with given name (or {@link ~Marker marker} was passed), the marker in\n\t * collection is updated and {@link module:engine/model/markercollection~MarkerCollection#event:update} event is fired\n\t * but only if there was a change (marker range or {@link module:engine/model/markercollection~Marker#managedUsingOperations}\n\t * flag has changed.\n\t *\n\t * @protected\n\t * @fires module:engine/model/markercollection~MarkerCollection#event:update\n\t * @param {String|module:engine/model/markercollection~Marker} markerOrName Name of marker to set or marker instance to update.\n\t * @param {module:engine/model/range~Range} range Marker range.\n\t * @param {Boolean} [managedUsingOperations=false] Specifies whether the marker is managed using operations.\n\t * @param {Boolean} [affectsData=false] Specifies whether the marker affects the data produced by the data pipeline\n\t * (is persisted in the editor's data).\n\t * @returns {module:engine/model/markercollection~Marker} `Marker` instance which was added or updated.\n\t */\n\t_set( markerOrName, range, managedUsingOperations = false, affectsData = false ) {\n\t\tconst markerName = markerOrName instanceof Marker ? markerOrName.name : markerOrName;\n\n\t\tif ( markerName.includes( ',' ) ) {\n\t\t\t/**\n\t\t\t * Marker name cannot contain the \",\" character.\n\t\t\t *\n\t\t\t * @error markercollection-incorrect-marker-name\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'markercollection-incorrect-marker-name', this );\n\t\t}\n\n\t\tconst oldMarker = this._markers.get( markerName );\n\n\t\tif ( oldMarker ) {\n\t\t\tconst oldRange = oldMarker.getRange();\n\t\t\tlet hasChanged = false;\n\n\t\t\tif ( !oldRange.isEqual( range ) ) {\n\t\t\t\toldMarker._attachLiveRange( LiveRange.fromRange( range ) );\n\t\t\t\thasChanged = true;\n\t\t\t}\n\n\t\t\tif ( managedUsingOperations != oldMarker.managedUsingOperations ) {\n\t\t\t\toldMarker._managedUsingOperations = managedUsingOperations;\n\t\t\t\thasChanged = true;\n\t\t\t}\n\n\t\t\tif ( typeof affectsData === 'boolean' && affectsData != oldMarker.affectsData ) {\n\t\t\t\toldMarker._affectsData = affectsData;\n\t\t\t\thasChanged = true;\n\t\t\t}\n\n\t\t\tif ( hasChanged ) {\n\t\t\t\tthis.fire( 'update:' + markerName, oldMarker, oldRange, range );\n\t\t\t}\n\n\t\t\treturn oldMarker;\n\t\t}\n\n\t\tconst liveRange = LiveRange.fromRange( range );\n\t\tconst marker = new Marker( markerName, liveRange, managedUsingOperations, affectsData );\n\n\t\tthis._markers.set( markerName, marker );\n\t\tthis.fire( 'update:' + markerName, marker, null, range );\n\n\t\treturn marker;\n\t}\n\n\t/**\n\t * Removes given {@link ~Marker marker} or a marker with given name from the `MarkerCollection`.\n\t *\n\t * @protected\n\t * @fires module:engine/model/markercollection~MarkerCollection#event:update\n\t * @param {String} markerOrName Marker or name of a marker to remove.\n\t * @returns {Boolean} `true` if marker was found and removed, `false` otherwise.\n\t */\n\t_remove( markerOrName ) {\n\t\tconst markerName = markerOrName instanceof Marker ? markerOrName.name : markerOrName;\n\t\tconst oldMarker = this._markers.get( markerName );\n\n\t\tif ( oldMarker ) {\n\t\t\tthis._markers.delete( markerName );\n\t\t\tthis.fire( 'update:' + markerName, oldMarker, oldMarker.getRange(), null );\n\n\t\t\tthis._destroyMarker( oldMarker );\n\n\t\t\treturn true;\n\t\t}\n\n\t\treturn false;\n\t}\n\n\t/**\n\t * Fires an {@link module:engine/model/markercollection~MarkerCollection#event:update} event for the given {@link ~Marker marker}\n\t * but does not change the marker. Useful to force {@link module:engine/conversion/downcastdispatcher~DowncastDispatcher downcast\n\t * conversion} for the marker.\n\t *\n\t * @protected\n\t * @fires module:engine/model/markercollection~MarkerCollection#event:update\n\t * @param {String} markerOrName Marker or name of a marker to refresh.\n\t */\n\t_refresh( markerOrName ) {\n\t\tconst markerName = markerOrName instanceof Marker ? markerOrName.name : markerOrName;\n\t\tconst marker = this._markers.get( markerName );\n\n\t\tif ( !marker ) {\n\t\t\t/**\n\t\t\t * Marker with provided name does not exists.\n\t\t\t *\n\t\t\t * @error markercollection-refresh-marker-not-exists\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'markercollection-refresh-marker-not-exists', this );\n\t\t}\n\n\t\tconst range = marker.getRange();\n\n\t\tthis.fire( 'update:' + markerName, marker, range, range, marker.managedUsingOperations, marker.affectsData );\n\t}\n\n\t/**\n\t * Returns iterator that iterates over all markers, which ranges contain given {@link module:engine/model/position~Position position}.\n\t *\n\t * @param {module:engine/model/position~Position} position\n\t * @returns {Iterable.<module:engine/model/markercollection~Marker>}\n\t */\n\t* getMarkersAtPosition( position ) {\n\t\tfor ( const marker of this ) {\n\t\t\tif ( marker.getRange().containsPosition( position ) ) {\n\t\t\t\tyield marker;\n\t\t\t}\n\t\t}\n\t}\n\n\t/**\n\t * Returns iterator that iterates over all markers, which intersects with given {@link module:engine/model/range~Range range}.\n\t *\n\t * @param {module:engine/model/range~Range} range\n\t * @returns {Iterable.<module:engine/model/markercollection~Marker>}\n\t */\n\t* getMarkersIntersectingRange( range ) {\n\t\tfor ( const marker of this ) {\n\t\t\tif ( marker.getRange().getIntersection( range ) !== null ) {\n\t\t\t\tyield marker;\n\t\t\t}\n\t\t}\n\t}\n\n\t/**\n\t * Destroys marker collection and all markers inside it.\n\t */\n\tdestroy() {\n\t\tfor ( const marker of this._markers.values() ) {\n\t\t\tthis._destroyMarker( marker );\n\t\t}\n\n\t\tthis._markers = null;\n\n\t\tthis.stopListening();\n\t}\n\n\t/**\n\t * Iterates over all markers that starts with given `prefix`.\n\t *\n\t *\t\tconst markerFooA = markersCollection.set( 'foo:a', rangeFooA );\n\t *\t\tconst markerFooB = markersCollection.set( 'foo:b', rangeFooB );\n\t *\t\tconst markerBarA = markersCollection.set( 'bar:a', rangeBarA );\n\t *\t\tconst markerFooBarA = markersCollection.set( 'foobar:a', rangeFooBarA );\n\t *\t\tArray.from( markersCollection.getMarkersGroup( 'foo' ) ); // [ markerFooA, markerFooB ]\n\t *\t\tArray.from( markersCollection.getMarkersGroup( 'a' ) ); // []\n\t *\n\t * @param prefix\n\t * @returns {Iterable.<module:engine/model/markercollection~Marker>}\n\t */\n\t* getMarkersGroup( prefix ) {\n\t\tfor ( const marker of this._markers.values() ) {\n\t\t\tif ( marker.name.startsWith( prefix + ':' ) ) {\n\t\t\t\tyield marker;\n\t\t\t}\n\t\t}\n\t}\n\n\t/**\n\t * Destroys the marker.\n\t *\n\t * @private\n\t * @param {module:engine/model/markercollection~Marker} marker Marker to destroy.\n\t */\n\t_destroyMarker( marker ) {\n\t\tmarker.stopListening();\n\t\tmarker._detachLiveRange();\n\t}\n\n\t/**\n\t * Fired whenever marker is added, updated or removed from `MarkerCollection`.\n\t *\n\t * @event update\n\t * @param {module:engine/model/markercollection~Marker} marker Updated Marker.\n\t * @param {module:engine/model/range~Range|null} oldRange Marker range before the update. When is not defined it\n\t * means that marker is just added.\n\t * @param {module:engine/model/range~Range|null} newRange Marker range after update. When is not defined it\n\t * means that marker is just removed.\n\t */\n}\n\nmix( MarkerCollection, EmitterMixin );\n\n/**\n * `Marker` is a continuous parts of model (like a range), is named and represent some kind of information about marked\n * part of model document. In contrary to {@link module:engine/model/node~Node nodes}, which are building blocks of\n * model document tree, markers are not stored directly in document tree but in\n * {@link module:engine/model/model~Model#markers model markers' collection}. Still, they are document data, by giving\n * additional meaning to the part of a model document between marker start and marker end.\n *\n * In this sense, markers are similar to adding and converting attributes on nodes. The difference is that attribute is\n * connected with a given node (e.g. a character is bold no matter if it gets moved or content around it changes).\n * Markers on the other hand are continuous ranges and are characterized by their start and end position. This means that\n * any character in the marker is marked by the marker. For example, if a character is moved outside of marker it stops being\n * \"special\" and the marker is shrunk. Similarly, when a character is moved into the marker from other place in document\n * model, it starts being \"special\" and the marker is enlarged.\n *\n * Another upside of markers is that finding marked part of document is fast and easy. Using attributes to mark some nodes\n * and then trying to find that part of document would require traversing whole document tree. Marker gives instant access\n * to the range which it is marking at the moment.\n *\n * Markers are built from a name and a range.\n *\n * Range of the marker is updated automatically when document changes, using\n * {@link module:engine/model/liverange~LiveRange live range} mechanism.\n *\n * Name is used to group and identify markers. Names have to be unique, but markers can be grouped by\n * using common prefixes, separated with `:`, for example: `user:john` or `search:3`. That's useful in term of creating\n * namespaces for custom elements (e.g. comments, highlights). You can use this prefixes in\n * {@link module:engine/model/markercollection~MarkerCollection#event:update} listeners to listen on changes in a group of markers.\n * For instance: `model.markers.on( 'update:user', callback );` will be called whenever any `user:*` markers changes.\n *\n * There are two types of markers.\n *\n * 1. Markers managed directly, without using operations. They are added directly by {@link module:engine/model/writer~Writer}\n * to the {@link module:engine/model/markercollection~MarkerCollection} without any additional mechanism. They can be used\n * as bookmarks or visual markers. They are great for showing results of the find, or select link when the focus is in the input.\n *\n * 1. Markers managed using operations. These markers are also stored in {@link module:engine/model/markercollection~MarkerCollection}\n * but changes in these markers is managed the same way all other changes in the model structure - using operations.\n * Therefore, they are handled in the undo stack and synchronized between clients if the collaboration plugin is enabled.\n * This type of markers is useful for solutions like spell checking or comments.\n *\n * Both type of them should be added / updated by {@link module:engine/model/writer~Writer#addMarker}\n * and removed by {@link module:engine/model/writer~Writer#removeMarker} methods.\n *\n *\t\tmodel.change( ( writer ) => {\n * \t\t\tconst marker = writer.addMarker( name, { range, usingOperation: true } );\n *\n * \t\t\t// ...\n *\n * \t\t\twriter.removeMarker( marker );\n *\t\t} );\n *\n * See {@link module:engine/model/writer~Writer} to find more examples.\n *\n * Since markers need to track change in the document, for efficiency reasons, it is best to create and keep as little\n * markers as possible and remove them as soon as they are not needed anymore.\n *\n * Markers can be downcasted and upcasted.\n *\n * Markers downcast happens on {@link module:engine/conversion/downcastdispatcher~DowncastDispatcher#event:addMarker} and\n * {@link module:engine/conversion/downcastdispatcher~DowncastDispatcher#event:removeMarker} events.\n * Use {@link module:engine/conversion/downcasthelpers downcast converters} or attach a custom converter to mentioned events.\n * For {@link module:engine/controller/datacontroller~DataController data pipeline}, marker should be downcasted to an element.\n * Then, it can be upcasted back to a marker. Again, use {@link module:engine/conversion/upcasthelpers upcast converters} or\n * attach a custom converter to {@link module:engine/conversion/upcastdispatcher~UpcastDispatcher#event:element}.\n *\n * `Marker` instances are created and destroyed only by {@link ~MarkerCollection MarkerCollection}.\n */\nclass Marker {\n\t/**\n\t * Creates a marker instance.\n\t *\n\t * @param {String} name Marker name.\n\t * @param {module:engine/model/liverange~LiveRange} liveRange Range marked by the marker.\n\t * @param {Boolean} managedUsingOperations Specifies whether the marker is managed using operations.\n\t * @param {Boolean} affectsData Specifies whether the marker affects the data produced by the data pipeline\n\t * (is persisted in the editor's data).\n\t */\n\tconstructor( name, liveRange, managedUsingOperations, affectsData ) {\n\t\t/**\n\t\t * Marker's name.\n\t\t *\n\t\t * @readonly\n\t\t * @type {String}\n\t\t */\n\t\tthis.name = name;\n\n\t\t/**\n\t\t * Range marked by the marker.\n\t\t *\n\t\t * @protected\n\t\t * @member {module:engine/model/liverange~LiveRange}\n\t\t */\n\t\tthis._liveRange = this._attachLiveRange( liveRange );\n\n\t\t/**\n\t\t * Flag indicates if the marker is managed using operations or not.\n\t\t *\n\t\t * @private\n\t\t * @member {Boolean}\n\t\t */\n\t\tthis._managedUsingOperations = managedUsingOperations;\n\n\t\t/**\n\t\t * Specifies whether the marker affects the data produced by the data pipeline\n\t\t * (is persisted in the editor's data).\n\t\t *\n\t\t * @private\n\t\t * @member {Boolean}\n\t\t */\n\t\tthis._affectsData = affectsData;\n\t}\n\n\t/**\n\t * A value indicating if the marker is managed using operations.\n\t * See {@link ~Marker marker class description} to learn more about marker types.\n\t * See {@link module:engine/model/writer~Writer#addMarker}.\n\t *\n\t * @returns {Boolean}\n\t */\n\tget managedUsingOperations() {\n\t\tif ( !this._liveRange ) {\n\t\t\tthrow new CKEditorError( 'marker-destroyed', this );\n\t\t}\n\n\t\treturn this._managedUsingOperations;\n\t}\n\n\t/**\n\t * A value indicating if the marker changes the data.\n\t *\n\t * @returns {Boolean}\n\t */\n\tget affectsData() {\n\t\tif ( !this._liveRange ) {\n\t\t\tthrow new CKEditorError( 'marker-destroyed', this );\n\t\t}\n\n\t\treturn this._affectsData;\n\t}\n\n\t/**\n\t * Returns current marker start position.\n\t *\n\t * @returns {module:engine/model/position~Position}\n\t */\n\tgetStart() {\n\t\tif ( !this._liveRange ) {\n\t\t\tthrow new CKEditorError( 'marker-destroyed', this );\n\t\t}\n\n\t\treturn this._liveRange.start.clone();\n\t}\n\n\t/**\n\t * Returns current marker end position.\n\t *\n\t * @returns {module:engine/model/position~Position}\n\t */\n\tgetEnd() {\n\t\tif ( !this._liveRange ) {\n\t\t\tthrow new CKEditorError( 'marker-destroyed', this );\n\t\t}\n\n\t\treturn this._liveRange.end.clone();\n\t}\n\n\t/**\n\t * Returns a range that represents the current state of the marker.\n\t *\n\t * Keep in mind that returned value is a {@link module:engine/model/range~Range Range}, not a\n\t * {@link module:engine/model/liverange~LiveRange LiveRange}. This means that it is up-to-date and relevant only\n\t * until next model document change. Do not store values returned by this method. Instead, store {@link ~Marker#name}\n\t * and get `Marker` instance from {@link module:engine/model/markercollection~MarkerCollection MarkerCollection} every\n\t * time there is a need to read marker properties. This will guarantee that the marker has not been removed and\n\t * that it's data is up-to-date.\n\t *\n\t * @returns {module:engine/model/range~Range}\n\t */\n\tgetRange() {\n\t\tif ( !this._liveRange ) {\n\t\t\tthrow new CKEditorError( 'marker-destroyed', this );\n\t\t}\n\n\t\treturn this._liveRange.toRange();\n\t}\n\n\t/**\n\t * Checks whether this object is of the given.\n\t *\n\t *\t\tmarker.is( 'marker' ); // -> true\n\t *\t\tmarker.is( 'model:marker' ); // -> true\n\t *\n\t *\t\tmarker.is( 'view:element' ); // -> false\n\t *\t\tmarker.is( 'documentSelection' ); // -> false\n\t *\n\t * {@link module:engine/model/node~Node#is Check the entire list of model objects} which implement the `is()` method.\n\t *\n\t * @param {String} type\n\t * @returns {Boolean}\n\t */\n\tis( type ) {\n\t\treturn type === 'marker' || type === 'model:marker';\n\t}\n\n\t/**\n\t * Binds new live range to the marker and detach the old one if is attached.\n\t *\n\t * @protected\n\t * @param {module:engine/model/liverange~LiveRange} liveRange Live range to attach\n\t * @returns {module:engine/model/liverange~LiveRange} Attached live range.\n\t */\n\t_attachLiveRange( liveRange ) {\n\t\tif ( this._liveRange ) {\n\t\t\tthis._detachLiveRange();\n\t\t}\n\n\t\t// Delegating does not work with namespaces. Alternatively, we could delegate all events (using `*`).\n\t\tliveRange.delegate( 'change:range' ).to( this );\n\t\tliveRange.delegate( 'change:content' ).to( this );\n\n\t\tthis._liveRange = liveRange;\n\n\t\treturn liveRange;\n\t}\n\n\t/**\n\t * Unbinds and destroys currently attached live range.\n\t *\n\t * @protected\n\t */\n\t_detachLiveRange() {\n\t\tthis._liveRange.stopDelegating( 'change:range', this );\n\t\tthis._liveRange.stopDelegating( 'change:content', this );\n\t\tthis._liveRange.detach();\n\t\tthis._liveRange = null;\n\t}\n\n\t/**\n\t * Fired whenever {@link ~Marker#_liveRange marker range} is changed due to changes on {@link module:engine/model/document~Document}.\n\t * This is a delegated {@link module:engine/model/liverange~LiveRange#event:change:range LiveRange change:range event}.\n\t *\n\t * When marker is removed from {@link module:engine/model/markercollection~MarkerCollection MarkerCollection},\n\t * all event listeners listening to it should be removed. It is best to do it on\n\t * {@link module:engine/model/markercollection~MarkerCollection#event:update MarkerCollection update event}.\n\t *\n\t * @see module:engine/model/liverange~LiveRange#event:change:range\n\t * @event change:range\n\t * @param {module:engine/model/range~Range} oldRange\n\t * @param {Object} data\n\t */\n\n\t/**\n\t * Fired whenever change on {@link module:engine/model/document~Document} is done inside {@link ~Marker#_liveRange marker range}.\n\t * This is a delegated {@link module:engine/model/liverange~LiveRange#event:change:content LiveRange change:content event}.\n\t *\n\t * When marker is removed from {@link module:engine/model/markercollection~MarkerCollection MarkerCollection},\n\t * all event listeners listening to it should be removed. It is best to do it on\n\t * {@link module:engine/model/markercollection~MarkerCollection#event:update MarkerCollection update event}.\n\t *\n\t * @see module:engine/model/liverange~LiveRange#event:change:content\n\t * @event change:content\n\t * @param {module:engine/model/range~Range} oldRange\n\t * @param {Object} data\n\t */\n}\n\nmix( Marker, EmitterMixin );\n\n/**\n * Cannot use a {@link module:engine/model/markercollection~MarkerCollection#destroy destroyed marker} instance.\n *\n * @error marker-destroyed\n */\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module engine/model/operation/nooperation\n */\n\nimport Operation from './operation';\n\n/**\n * Operation which is doing nothing (\"empty operation\", \"do-nothing operation\", \"noop\"). This is an operation,\n * which when executed does not change the tree model. It still has some parameters defined for transformation purposes.\n *\n * In most cases this operation is a result of transforming operations. When transformation returns\n * {@link module:engine/model/operation/nooperation~NoOperation} it means that changes done by the transformed operation\n * have already been applied.\n *\n * @extends module:engine/model/operation/operation~Operation\n */\nexport default class NoOperation extends Operation {\n\tget type() {\n\t\treturn 'noop';\n\t}\n\n\t/**\n\t * Creates and returns an operation that has the same parameters as this operation.\n\t *\n\t * @returns {module:engine/model/operation/nooperation~NoOperation} Clone of this operation.\n\t */\n\tclone() {\n\t\treturn new NoOperation( this.baseVersion );\n\t}\n\n\t/**\n\t * See {@link module:engine/model/operation/operation~Operation#getReversed `Operation#getReversed()`}.\n\t *\n\t * @returns {module:engine/model/operation/nooperation~NoOperation}\n\t */\n\tgetReversed() {\n\t\treturn new NoOperation( this.baseVersion + 1 );\n\t}\n\n\t_execute() {\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tstatic get className() {\n\t\treturn 'NoOperation';\n\t}\n\n\t// @if CK_DEBUG_ENGINE // toString() {\n\t// @if CK_DEBUG_ENGINE // \treturn `NoOperation( ${ this.baseVersion } )`;\n\t// @if CK_DEBUG_ENGINE // }\n}\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module engine/model/operation/operationfactory\n */\n\nimport AttributeOperation from '../operation/attributeoperation';\nimport InsertOperation from '../operation/insertoperation';\nimport MarkerOperation from '../operation/markeroperation';\nimport MoveOperation from '../operation/moveoperation';\nimport NoOperation from '../operation/nooperation';\nimport Operation from '../operation/operation';\nimport RenameOperation from '../operation/renameoperation';\nimport RootAttributeOperation from '../operation/rootattributeoperation';\nimport SplitOperation from '../operation/splitoperation';\nimport MergeOperation from '../operation/mergeoperation';\n\nconst operations = {};\noperations[ AttributeOperation.className ] = AttributeOperation;\noperations[ InsertOperation.className ] = InsertOperation;\noperations[ MarkerOperation.className ] = MarkerOperation;\noperations[ MoveOperation.className ] = MoveOperation;\noperations[ NoOperation.className ] = NoOperation;\noperations[ Operation.className ] = Operation;\noperations[ RenameOperation.className ] = RenameOperation;\noperations[ RootAttributeOperation.className ] = RootAttributeOperation;\noperations[ SplitOperation.className ] = SplitOperation;\noperations[ MergeOperation.className ] = MergeOperation;\n\n/**\n * A factory class for creating operations.\n *\n * @abstract\n */\nexport default class OperationFactory {\n\t/**\n\t * Creates an operation instance from a JSON object (parsed JSON string).\n\t *\n\t * @param {Object} json Deserialized JSON object.\n\t * @param {module:engine/model/document~Document} document Document on which this operation will be applied.\n\t * @returns {module:engine/model/operation/operation~Operation}\n\t */\n\tstatic fromJSON( json, document ) {\n\t\treturn operations[ json.__className ].fromJSON( json, document );\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module engine/model/liveposition\n */\n\nimport Position from './position';\nimport EmitterMixin from '@ckeditor/ckeditor5-utils/src/emittermixin';\nimport mix from '@ckeditor/ckeditor5-utils/src/mix';\nimport CKEditorError from '@ckeditor/ckeditor5-utils/src/ckeditorerror';\n\n/**\n * `LivePosition` is a type of {@link module:engine/model/position~Position Position}\n * that updates itself as {@link module:engine/model/document~Document document}\n * is changed through operations. It may be used as a bookmark.\n *\n * **Note:** Contrary to {@link module:engine/model/position~Position}, `LivePosition` works only in roots that are\n * {@link module:engine/model/rootelement~RootElement}.\n * If {@link module:engine/model/documentfragment~DocumentFragment} is passed, error will be thrown.\n *\n * **Note:** Be very careful when dealing with `LivePosition`. Each `LivePosition` instance bind events that might\n * have to be unbound.\n * Use {@link module:engine/model/liveposition~LivePosition#detach} whenever you don't need `LivePosition` anymore.\n *\n * @extends module:engine/model/position~Position\n */\nexport default class LivePosition extends Position {\n\t/**\n\t * Creates a live position.\n\t *\n\t * @see module:engine/model/position~Position\n\t * @param {module:engine/model/rootelement~RootElement} root\n\t * @param {Array.<Number>} path\n\t * @param {module:engine/model/position~PositionStickiness} [stickiness]\n\t */\n\tconstructor( root, path, stickiness = 'toNone' ) {\n\t\tsuper( root, path, stickiness );\n\n\t\tif ( !this.root.is( 'rootElement' ) ) {\n\t\t\t/**\n\t\t\t * LivePosition's root has to be an instance of RootElement.\n\t\t\t *\n\t\t\t * @error model-liveposition-root-not-rootelement\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'model-liveposition-root-not-rootelement', root );\n\t\t}\n\n\t\tbindWithDocument.call( this );\n\t}\n\n\t/**\n\t * Unbinds all events previously bound by `LivePosition`. Use it whenever you don't need `LivePosition` instance\n\t * anymore (i.e. when leaving scope in which it was declared or before re-assigning variable that was\n\t * referring to it).\n\t */\n\tdetach() {\n\t\tthis.stopListening();\n\t}\n\n\t/**\n\t * Checks whether this object is of the given.\n\t *\n\t *\t\tlivePosition.is( 'position' ); // -> true\n\t *\t\tlivePosition.is( 'model:position' ); // -> true\n\t *\t\tlivePosition.is( 'liveposition' ); // -> true\n\t *\t\tlivePosition.is( 'model:livePosition' ); // -> true\n\t *\n\t *\t\tlivePosition.is( 'view:position' ); // -> false\n\t *\t\tlivePosition.is( 'documentSelection' ); // -> false\n\t *\n\t * {@link module:engine/model/node~Node#is Check the entire list of model objects} which implement the `is()` method.\n\t *\n\t * @param {String} type\n\t * @returns {Boolean}\n\t */\n\tis( type ) {\n\t\treturn type === 'livePosition' || type === 'model:livePosition' ||\n\t\t\t// From super.is(). This is highly utilised method and cannot call super. See ckeditor/ckeditor5#6529.\n\t\t\ttype == 'position' || type === 'model:position';\n\t}\n\n\t/**\n\t * Creates a {@link module:engine/model/position~Position position instance}, which is equal to this live position.\n\t *\n\t * @returns {module:engine/model/position~Position}\n\t */\n\ttoPosition() {\n\t\treturn new Position( this.root, this.path.slice(), this.stickiness );\n\t}\n\n\t/**\n\t * Creates a `LivePosition` instance that is equal to position.\n\t *\n\t * @param {module:engine/model/position~Position} position\n\t * @param {module:engine/model/position~PositionStickiness} [stickiness]\n\t * @returns {module:engine/model/position~Position}\n\t */\n\tstatic fromPosition( position, stickiness ) {\n\t\treturn new this( position.root, position.path.slice(), stickiness ? stickiness : position.stickiness );\n\t}\n\n\t/**\n\t * @static\n\t * @protected\n\t * @method module:engine/model/liveposition~LivePosition._createAfter\n\t * @see module:engine/model/position~Position._createAfter\n\t * @param {module:engine/model/node~Node} node\n\t * @param {module:engine/model/position~PositionStickiness} [stickiness='toNone']\n\t * @returns {module:engine/model/liveposition~LivePosition}\n\t */\n\n\t/**\n\t * @static\n\t * @protected\n\t * @method module:engine/model/liveposition~LivePosition._createBefore\n\t * @see module:engine/model/position~Position._createBefore\n\t * @param {module:engine/model/node~Node} node\n\t * @param {module:engine/model/position~PositionStickiness} [stickiness='toNone']\n\t * @returns {module:engine/model/liveposition~LivePosition}\n\t */\n\n\t/**\n\t * @static\n\t * @protected\n\t * @method module:engine/model/liveposition~LivePosition._createAt\n\t * @see module:engine/model/position~Position._createAt\n\t * @param {module:engine/model/item~Item|module:engine/model/position~Position} itemOrPosition\n\t * @param {Number|'end'|'before'|'after'} [offset]\n\t * @param {module:engine/model/position~PositionStickiness} [stickiness='toNone']\n\t * @returns {module:engine/model/liveposition~LivePosition}\n\t */\n\n\t/**\n\t * Fired when `LivePosition` instance is changed due to changes on {@link module:engine/model/document~Document}.\n\t *\n\t * @event module:engine/model/liveposition~LivePosition#change\n\t * @param {module:engine/model/position~Position} oldPosition Position equal to this live position before it got changed.\n\t */\n}\n\n// Binds this `LivePosition` to the {@link module:engine/model/document~Document document} that owns\n// this position's {@link module:engine/model/position~Position#root root}.\n//\n// @private\nfunction bindWithDocument() {\n\tthis.listenTo(\n\t\tthis.root.document.model,\n\t\t'applyOperation',\n\t\t( event, args ) => {\n\t\t\tconst operation = args[ 0 ];\n\n\t\t\tif ( !operation.isDocumentOperation ) {\n\t\t\t\treturn;\n\t\t\t}\n\n\t\t\ttransform.call( this, operation );\n\t\t},\n\t\t{ priority: 'low' }\n\t);\n}\n\n// Updates this position accordingly to the updates applied to the model. Bases on change events.\n//\n// @private\n// @param {module:engine/model/operation/operation~Operation} operation Executed operation.\nfunction transform( operation ) {\n\tconst result = this.getTransformedByOperation( operation );\n\n\tif ( !this.isEqual( result ) ) {\n\t\tconst oldPosition = this.toPosition();\n\n\t\tthis.path = result.path;\n\t\tthis.root = result.root;\n\n\t\tthis.fire( 'change', oldPosition );\n\t}\n}\n\nmix( LivePosition, EmitterMixin );\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module engine/model/utils/insertcontent\n */\n\nimport Position from '../position';\nimport LivePosition from '../liveposition';\nimport Element from '../element';\nimport Range from '../range';\nimport DocumentSelection from '../documentselection';\nimport Selection from '../selection';\nimport CKEditorError from '@ckeditor/ckeditor5-utils/src/ckeditorerror';\n\n/**\n * Inserts content into the editor (specified selection) as one would expect the paste\n * functionality to work.\n *\n * If an instance of {@link module:engine/model/selection~Selection} is passed as `selectable` it will be modified\n * to the insertion selection (equal to a range to be selected after insertion).\n *\n * If `selectable` is not passed, the content will be inserted using the current selection of the model document.\n *\n * **Note:** Use {@link module:engine/model/model~Model#insertContent} instead of this function.\n * This function is only exposed to be reusable in algorithms which change the {@link module:engine/model/model~Model#insertContent}\n * method's behavior.\n *\n * @param {module:engine/model/model~Model} model The model in context of which the insertion\n * should be performed.\n * @param {module:engine/model/documentfragment~DocumentFragment|module:engine/model/item~Item} content The content to insert.\n * @param {module:engine/model/selection~Selectable} [selectable=model.document.selection]\n * Selection into which the content should be inserted.\n * @param {Number|'before'|'end'|'after'|'on'|'in'} [placeOrOffset] Sets place or offset of the selection.\n * @returns {module:engine/model/range~Range} Range which contains all the performed changes. This is a range that, if removed,\n * would return the model to the state before the insertion. If no changes were preformed by `insertContent`, returns a range collapsed\n * at the insertion position.\n */\nexport default function insertContent( model, content, selectable, placeOrOffset ) {\n\treturn model.change( writer => {\n\t\tlet selection;\n\n\t\tif ( !selectable ) {\n\t\t\tselection = model.document.selection;\n\t\t} else if ( selectable instanceof Selection || selectable instanceof DocumentSelection ) {\n\t\t\tselection = selectable;\n\t\t} else {\n\t\t\tselection = writer.createSelection( selectable, placeOrOffset );\n\t\t}\n\n\t\tif ( !selection.isCollapsed ) {\n\t\t\tmodel.deleteContent( selection, { doNotAutoparagraph: true } );\n\t\t}\n\n\t\tconst insertion = new Insertion( model, writer, selection.anchor );\n\n\t\tlet nodesToInsert;\n\n\t\tif ( content.is( 'documentFragment' ) ) {\n\t\t\tnodesToInsert = content.getChildren();\n\t\t} else {\n\t\t\tnodesToInsert = [ content ];\n\t\t}\n\n\t\tinsertion.handleNodes( nodesToInsert, {\n\t\t\t// The set of children being inserted is the only set in this context\n\t\t\t// so it's the first and last (it's a hack ;)).\n\t\t\tisFirst: true,\n\t\t\tisLast: true\n\t\t} );\n\n\t\tconst newRange = insertion.getSelectionRange();\n\n\t\t/* istanbul ignore else */\n\t\tif ( newRange ) {\n\t\t\tif ( selection instanceof DocumentSelection ) {\n\t\t\t\twriter.setSelection( newRange );\n\t\t\t} else {\n\t\t\t\tselection.setTo( newRange );\n\t\t\t}\n\t\t} else {\n\t\t\t// We are not testing else because it's a safe check for unpredictable edge cases:\n\t\t\t// an insertion without proper range to select.\n\t\t\t//\n\t\t\t// @if CK_DEBUG // console.warn( 'Cannot determine a proper selection range after insertion.' );\n\t\t}\n\n\t\tconst affectedRange = insertion.getAffectedRange() || model.createRange( selection.anchor );\n\n\t\tinsertion.destroy();\n\n\t\treturn affectedRange;\n\t} );\n}\n\n/**\n * Utility class for performing content insertion.\n *\n * @private\n */\nclass Insertion {\n\tconstructor( model, writer, position ) {\n\t\t/**\n\t\t * The model in context of which the insertion should be performed.\n\t\t *\n\t\t * @member {module:engine/model~Model} #model\n\t\t */\n\t\tthis.model = model;\n\n\t\t/**\n\t\t * Batch to which operations will be added.\n\t\t *\n\t\t * @member {module:engine/controller/writer~Batch} #writer\n\t\t */\n\t\tthis.writer = writer;\n\n\t\t/**\n\t\t * The position at which (or near which) the next node will be inserted.\n\t\t *\n\t\t * @member {module:engine/model/position~Position} #position\n\t\t */\n\t\tthis.position = position;\n\n\t\t/**\n\t\t * Elements with which the inserted elements can be merged.\n\t\t *\n\t\t *\t\t<p>x^</p><p>y</p> + <p>z</p> (can merge to <p>x</p>)\n\t\t *\t\t<p>x</p><p>^y</p> + <p>z</p> (can merge to <p>y</p>)\n\t\t *\t\t<p>x^y</p> + <p>z</p> (can merge to <p>xy</p> which will be split during the action,\n\t\t *\t\t\t\t\t\t\t\tso both its pieces will be added to this set)\n\t\t *\n\t\t *\n\t\t * @member {Set} #canMergeWith\n\t\t */\n\t\tthis.canMergeWith = new Set( [ this.position.parent ] );\n\n\t\t/**\n\t\t * Schema of the model.\n\t\t *\n\t\t * @member {module:engine/model/schema~Schema} #schema\n\t\t */\n\t\tthis.schema = model.schema;\n\n\t\tthis._filterAttributesOf = [];\n\n\t\t/**\n\t\t * Beginning of the affected range. See {@link module:engine/model/utils/insertcontent~Insertion#getAffectedRange}.\n\t\t *\n\t\t * @private\n\t\t * @member {module:engine/model/liveposition~LivePosition|null} #_affectedStart\n\t\t */\n\t\tthis._affectedStart = null;\n\n\t\t/**\n\t\t * End of the affected range. See {@link module:engine/model/utils/insertcontent~Insertion#getAffectedRange}.\n\t\t *\n\t\t * @private\n\t\t * @member {module:engine/model/liveposition~LivePosition|null} #_affectedEnd\n\t\t */\n\t\tthis._affectedEnd = null;\n\t}\n\n\t/**\n\t * Handles insertion of a set of nodes.\n\t *\n\t * @param {Iterable.<module:engine/model/node~Node>} nodes Nodes to insert.\n\t * @param {Object} parentContext Context in which parent of these nodes was supposed to be inserted.\n\t * If the parent context is passed it means that the parent element was stripped (was not allowed).\n\t */\n\thandleNodes( nodes, parentContext ) {\n\t\tnodes = Array.from( nodes );\n\n\t\tfor ( let i = 0; i < nodes.length; i++ ) {\n\t\t\tconst node = nodes[ i ];\n\n\t\t\tthis._handleNode( node, {\n\t\t\t\tisFirst: i === 0 && parentContext.isFirst,\n\t\t\t\tisLast: ( i === ( nodes.length - 1 ) ) && parentContext.isLast\n\t\t\t} );\n\t\t}\n\n\t\t// TMP this will become a post-fixer.\n\t\tthis.schema.removeDisallowedAttributes( this._filterAttributesOf, this.writer );\n\t\tthis._filterAttributesOf = [];\n\t}\n\n\t/**\n\t * Returns range to be selected after insertion.\n\t * Returns `null` if there is no valid range to select after insertion.\n\t *\n\t * @returns {module:engine/model/range~Range|null}\n\t */\n\tgetSelectionRange() {\n\t\tif ( this.nodeToSelect ) {\n\t\t\treturn Range._createOn( this.nodeToSelect );\n\t\t}\n\n\t\treturn this.model.schema.getNearestSelectionRange( this.position );\n\t}\n\n\t/**\n\t * Returns a range which contains all the performed changes. This is a range that, if removed, would return the model to the state\n\t * before the insertion. Returns `null` if no changes were done.\n\t *\n\t * @returns {module:engine/model/range~Range|null}\n\t */\n\tgetAffectedRange() {\n\t\tif ( !this._affectedStart ) {\n\t\t\treturn null;\n\t\t}\n\n\t\treturn new Range( this._affectedStart, this._affectedEnd );\n\t}\n\n\t/**\n\t * Destroys `Insertion` instance.\n\t */\n\tdestroy() {\n\t\tif ( this._affectedStart ) {\n\t\t\tthis._affectedStart.detach();\n\t\t}\n\n\t\tif ( this._affectedEnd ) {\n\t\t\tthis._affectedEnd.detach();\n\t\t}\n\t}\n\n\t/**\n\t * Handles insertion of a single node.\n\t *\n\t * @private\n\t * @param {module:engine/model/node~Node} node\n\t * @param {Object} context\n\t * @param {Boolean} context.isFirst Whether the given node is the first one in the content to be inserted.\n\t * @param {Boolean} context.isLast Whether the given node is the last one in the content to be inserted.\n\t */\n\t_handleNode( node, context ) {\n\t\t// Let's handle object in a special way.\n\t\t// * They should never be merged with other elements.\n\t\t// * If they are not allowed in any of the selection ancestors, they could be either autoparagraphed or totally removed.\n\t\tif ( this.schema.isObject( node ) ) {\n\t\t\tthis._handleObject( node, context );\n\n\t\t\treturn;\n\t\t}\n\n\t\t// Try to find a place for the given node.\n\t\t// Split the position.parent's branch up to a point where the node can be inserted.\n\t\t// If it isn't allowed in the whole branch, then of course don't split anything.\n\t\tconst isAllowed = this._checkAndSplitToAllowedPosition( node, context );\n\n\t\tif ( !isAllowed ) {\n\t\t\tthis._handleDisallowedNode( node, context );\n\n\t\t\treturn;\n\t\t}\n\n\t\tthis._insert( node );\n\n\t\t// After the node was inserted we may try to merge it with its siblings.\n\t\t// This should happen only if it was the first and/or last of the nodes (so only with boundary nodes)\n\t\t// and only if the selection was in those elements initially.\n\t\t//\n\t\t// E.g.:\n\t\t// <p>x^</p> + <p>y</p> => <p>x</p><p>y</p> => <p>xy[]</p>\n\t\t// and:\n\t\t// <p>x^y</p> + <p>z</p> => <p>x</p>^<p>y</p> + <p>z</p> => <p>x</p><p>z</p><p>y</p> => <p>xz[]y</p>\n\t\t// but:\n\t\t// <p>x</p><p>^</p><p>z</p> + <p>y</p> => <p>x</p><p>y</p><p>z</p> (no merging)\n\t\t// <p>x</p>[<img>]<p>z</p> + <p>y</p> => <p>x</p><p>y</p><p>z</p> (no merging, note: after running deleteContents\n\t\t//\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t it's exactly the same case as above)\n\t\tthis._mergeSiblingsOf( node, context );\n\t}\n\n\t/**\n\t * @private\n\t * @param {module:engine/model/element~Element} node The object element.\n\t * @param {Object} context\n\t */\n\t_handleObject( node, context ) {\n\t\t// Try finding it a place in the tree.\n\t\tif ( this._checkAndSplitToAllowedPosition( node ) ) {\n\t\t\tthis._insert( node );\n\t\t}\n\t\t// Try autoparagraphing.\n\t\telse {\n\t\t\tthis._tryAutoparagraphing( node, context );\n\t\t}\n\t}\n\n\t/**\n\t * @private\n\t * @param {module:engine/model/node~Node} node The disallowed node which needs to be handled.\n\t * @param {Object} context\n\t */\n\t_handleDisallowedNode( node, context ) {\n\t\t// If the node is an element, try inserting its children (strip the parent).\n\t\tif ( node.is( 'element' ) ) {\n\t\t\tthis.handleNodes( node.getChildren(), context );\n\t\t}\n\t\t// If text is not allowed, try autoparagraphing it.\n\t\telse {\n\t\t\tthis._tryAutoparagraphing( node, context );\n\t\t}\n\t}\n\n\t/**\n\t * @private\n\t * @param {module:engine/model/node~Node} node The node to insert.\n\t */\n\t_insert( node ) {\n\t\t/* istanbul ignore if */\n\t\tif ( !this.schema.checkChild( this.position, node ) ) {\n\t\t\t// Algorithm's correctness check. We should never end up here but it's good to know that we did.\n\t\t\t// Note that it would often be a silent issue if we insert node in a place where it's not allowed.\n\n\t\t\t/**\n\t\t\t * Given node cannot be inserted on the given position.\n\t\t\t *\n\t\t\t * @error insertcontent-wrong-position\n\t\t\t * @param {module:engine/model/node~Node} node Node to insert.\n\t\t\t * @param {module:engine/model/position~Position} position Position to insert the node at.\n\t\t\t */\n\t\t\tthrow new CKEditorError(\n\t\t\t\t'insertcontent-wrong-position',\n\t\t\t\tthis,\n\t\t\t\t{ node, position: this.position }\n\t\t\t);\n\t\t}\n\n\t\tconst livePos = LivePosition.fromPosition( this.position, 'toNext' );\n\n\t\tthis._setAffectedBoundaries( this.position );\n\t\tthis.writer.insert( node, this.position );\n\n\t\tthis.position = livePos.toPosition();\n\t\tlivePos.detach();\n\n\t\t// The last inserted object should be selected because we can't put a collapsed selection after it.\n\t\tif ( this.schema.isObject( node ) && !this.schema.checkChild( this.position, '$text' ) ) {\n\t\t\tthis.nodeToSelect = node;\n\t\t} else {\n\t\t\tthis.nodeToSelect = null;\n\t\t}\n\n\t\tthis._filterAttributesOf.push( node );\n\t}\n\n\t/**\n\t * Sets `_affectedStart` and `_affectedEnd` to the given `position`. Should be used before a change is done during insertion process to\n\t * mark the affected range.\n\t *\n\t * This method is used before inserting a node or splitting a parent node. `_affectedStart` and `_affectedEnd` are also changed\n\t * during merging, but the logic there is more complicated so it is left out of this function.\n\t *\n\t * @private\n\t * @param {module:engine/model/position~Position} position\n\t */\n\t_setAffectedBoundaries( position ) {\n\t\t// Set affected boundaries stickiness so that those position will \"expand\" when something is inserted in between them:\n\t\t// <paragraph>Foo][bar</paragraph> -> <paragraph>Foo]xx[bar</paragraph>\n\t\t// This is why it cannot be a range but two separate positions.\n\t\tif ( !this._affectedStart ) {\n\t\t\tthis._affectedStart = LivePosition.fromPosition( position, 'toPrevious' );\n\t\t}\n\n\t\t// If `_affectedEnd` is before the new boundary position, expand `_affectedEnd`. This can happen if first inserted node was\n\t\t// inserted into the parent but the next node is moved-out of that parent:\n\t\t// (1) <paragraph>Foo][</paragraph> -> <paragraph>Foo]xx[</paragraph>\n\t\t// (2) <paragraph>Foo]xx[</paragraph> -> <paragraph>Foo]xx</paragraph><widget></widget>[\n\t\tif ( !this._affectedEnd || this._affectedEnd.isBefore( position ) ) {\n\t\t\tif ( this._affectedEnd ) {\n\t\t\t\tthis._affectedEnd.detach();\n\t\t\t}\n\n\t\t\tthis._affectedEnd = LivePosition.fromPosition( position, 'toNext' );\n\t\t}\n\t}\n\n\t/**\n\t * @private\n\t * @param {module:engine/model/node~Node} node The node which could potentially be merged.\n\t * @param {Object} context\n\t */\n\t_mergeSiblingsOf( node, context ) {\n\t\tif ( !( node instanceof Element ) ) {\n\t\t\treturn;\n\t\t}\n\n\t\tconst mergeLeft = this._canMergeLeft( node, context );\n\t\tconst mergeRight = this._canMergeRight( node, context );\n\t\tconst mergePosLeft = LivePosition._createBefore( node );\n\t\tmergePosLeft.stickiness = 'toNext';\n\t\tconst mergePosRight = LivePosition._createAfter( node );\n\t\tmergePosRight.stickiness = 'toNext';\n\n\t\tif ( mergeLeft ) {\n\t\t\tconst livePosition = LivePosition.fromPosition( this.position );\n\t\t\tlivePosition.stickiness = 'toNext';\n\n\t\t\t// If `_affectedStart` is sames as merge position, it means that the element \"marked\" by `_affectedStart` is going to be\n\t\t\t// removed and its contents will be moved. This won't transform `LivePosition` so `_affectedStart` needs to be moved\n\t\t\t// by hand to properly reflect affected range. (Due to `_affectedStart` and `_affectedEnd` stickiness, the \"range\" is\n\t\t\t// shown as `][`).\n\t\t\t//\n\t\t\t// Example - insert `<paragraph>Abc</paragraph><paragraph>Xyz</paragraph>` at the end of `<paragraph>Foo^</paragraph>`:\n\t\t\t//\n\t\t\t// <paragraph>Foo</paragraph><paragraph>Bar</paragraph>   -->\n\t\t\t// <paragraph>Foo</paragraph>]<paragraph>Abc</paragraph><paragraph>Xyz</paragraph>[<paragraph>Bar</paragraph>   -->\n\t\t\t// <paragraph>Foo]Abc</paragraph><paragraph>Xyz</paragraph>[<paragraph>Bar</paragraph>\n\t\t\t//\n\t\t\t// Note, that if we are here then something must have been inserted, so `_affectedStart` and `_affectedEnd` have to be set.\n\t\t\tif ( this._affectedStart.isEqual( mergePosLeft ) ) {\n\t\t\t\tthis._affectedStart.detach();\n\t\t\t\tthis._affectedStart = LivePosition._createAt( mergePosLeft.nodeBefore, 'end', 'toPrevious' );\n\t\t\t}\n\n\t\t\tthis.writer.merge( mergePosLeft );\n\n\t\t\t// If only one element (the merged one) is in the \"affected range\", also move the affected range end appropriately.\n\t\t\t//\n\t\t\t// Example - insert `<paragraph>Abc</paragraph>` at the of `<paragraph>Foo^</paragraph>`:\n\t\t\t//\n\t\t\t// <paragraph>Foo</paragraph><paragraph>Bar</paragraph>   -->\n\t\t\t// <paragraph>Foo</paragraph>]<paragraph>Abc</paragraph>[<paragraph>Bar</paragraph>   -->\n\t\t\t// <paragraph>Foo]Abc</paragraph>[<paragraph>Bar</paragraph>   -->\n\t\t\t// <paragraph>Foo]Abc[</paragraph><paragraph>Bar</paragraph>\n\t\t\tif ( mergePosLeft.isEqual( this._affectedEnd ) && context.isLast ) {\n\t\t\t\tthis._affectedEnd.detach();\n\t\t\t\tthis._affectedEnd = LivePosition._createAt( mergePosLeft.nodeBefore, 'end', 'toNext' );\n\t\t\t}\n\n\t\t\tthis.position = livePosition.toPosition();\n\t\t\tlivePosition.detach();\n\t\t}\n\n\t\tif ( mergeRight ) {\n\t\t\t/* istanbul ignore if */\n\t\t\tif ( !this.position.isEqual( mergePosRight ) ) {\n\t\t\t\t// Algorithm's correctness check. We should never end up here but it's good to know that we did.\n\t\t\t\t// At this point the insertion position should be after the node we'll merge. If it isn't,\n\t\t\t\t// it should need to be secured as in the left merge case.\n\t\t\t\t/**\n\t\t\t\t * An internal error occurred when merging inserted content with its siblings.\n\t\t\t\t * The insertion position should equal the merge position.\n\t\t\t\t *\n\t\t\t\t * If you encountered this error, report it back to the CKEditor 5 team\n\t\t\t\t * with as many details as possible regarding the content being inserted and the insertion position.\n\t\t\t\t *\n\t\t\t\t * @error insertcontent-invalid-insertion-position\n\t\t\t\t */\n\t\t\t\tthrow new CKEditorError( 'insertcontent-invalid-insertion-position', this );\n\t\t\t}\n\n\t\t\t// Move the position to the previous node, so it isn't moved to the graveyard on merge.\n\t\t\t// <p>x</p>[]<p>y</p> => <p>x[]</p><p>y</p>\n\t\t\tthis.position = Position._createAt( mergePosRight.nodeBefore, 'end' );\n\n\t\t\t// OK:  <p>xx[]</p> + <p>yy</p> => <p>xx[]yy</p> (when sticks to previous)\n\t\t\t// NOK: <p>xx[]</p> + <p>yy</p> => <p>xxyy[]</p> (when sticks to next)\n\t\t\tconst livePosition = LivePosition.fromPosition( this.position, 'toPrevious' );\n\n\t\t\t// See comment above on moving `_affectedStart`.\n\t\t\tif ( this._affectedEnd.isEqual( mergePosRight ) ) {\n\t\t\t\tthis._affectedEnd.detach();\n\t\t\t\tthis._affectedEnd = LivePosition._createAt( mergePosRight.nodeBefore, 'end', 'toNext' );\n\t\t\t}\n\n\t\t\tthis.writer.merge( mergePosRight );\n\n\t\t\t// See comment above on moving `_affectedStart`.\n\t\t\tif ( mergePosRight.getShiftedBy( -1 ).isEqual( this._affectedStart ) && context.isFirst ) {\n\t\t\t\tthis._affectedStart.detach();\n\t\t\t\tthis._affectedStart = LivePosition._createAt( mergePosRight.nodeBefore, 0, 'toPrevious' );\n\t\t\t}\n\n\t\t\tthis.position = livePosition.toPosition();\n\t\t\tlivePosition.detach();\n\t\t}\n\n\t\tif ( mergeLeft || mergeRight ) {\n\t\t\t// After merge elements that were marked by _insert() to be filtered might be gone so\n\t\t\t// we need to mark the new container.\n\t\t\tthis._filterAttributesOf.push( this.position.parent );\n\t\t}\n\n\t\tmergePosLeft.detach();\n\t\tmergePosRight.detach();\n\t}\n\n\t/**\n\t * Checks whether specified node can be merged with previous sibling element.\n\t *\n\t * @private\n\t * @param {module:engine/model/node~Node} node The node which could potentially be merged.\n\t * @param {Object} context\n\t * @returns {Boolean}\n\t */\n\t_canMergeLeft( node, context ) {\n\t\tconst previousSibling = node.previousSibling;\n\n\t\treturn context.isFirst &&\n\t\t\t( previousSibling instanceof Element ) &&\n\t\t\tthis.canMergeWith.has( previousSibling ) &&\n\t\t\tthis.model.schema.checkMerge( previousSibling, node );\n\t}\n\n\t/**\n\t * Checks whether specified node can be merged with next sibling element.\n\t *\n\t * @private\n\t * @param {module:engine/model/node~Node} node The node which could potentially be merged.\n\t * @param {Object} context\n\t * @returns {Boolean}\n\t */\n\t_canMergeRight( node, context ) {\n\t\tconst nextSibling = node.nextSibling;\n\n\t\treturn context.isLast &&\n\t\t\t( nextSibling instanceof Element ) &&\n\t\t\tthis.canMergeWith.has( nextSibling ) &&\n\t\t\tthis.model.schema.checkMerge( node, nextSibling );\n\t}\n\n\t/**\n\t * Tries wrapping the node in a new paragraph and inserting it this way.\n\t *\n\t * @private\n\t * @param {module:engine/model/node~Node} node The node which needs to be autoparagraphed.\n\t * @param {Object} context\n\t */\n\t_tryAutoparagraphing( node, context ) {\n\t\tconst paragraph = this.writer.createElement( 'paragraph' );\n\n\t\t// Do not autoparagraph if the paragraph won't be allowed there,\n\t\t// cause that would lead to an infinite loop. The paragraph would be rejected in\n\t\t// the next _handleNode() call and we'd be here again.\n\t\tif ( this._getAllowedIn( paragraph, this.position.parent ) && this.schema.checkChild( paragraph, node ) ) {\n\t\t\tparagraph._appendChild( node );\n\t\t\tthis._handleNode( paragraph, context );\n\t\t}\n\t}\n\n\t/**\n\t * @private\n\t * @param {module:engine/model/node~Node} node\n\t * @returns {Boolean} Whether an allowed position was found.\n\t * `false` is returned if the node isn't allowed at any position up in the tree, `true` if was.\n\t */\n\t_checkAndSplitToAllowedPosition( node ) {\n\t\tconst allowedIn = this._getAllowedIn( node, this.position.parent );\n\n\t\tif ( !allowedIn ) {\n\t\t\treturn false;\n\t\t}\n\n\t\twhile ( allowedIn != this.position.parent ) {\n\t\t\t// If a parent which we'd need to leave is a limit element, break.\n\t\t\tif ( this.schema.isLimit( this.position.parent ) ) {\n\t\t\t\treturn false;\n\t\t\t}\n\n\t\t\tif ( this.position.isAtStart ) {\n\t\t\t\t// If insertion position is at the beginning of the parent, move it out instead of splitting.\n\t\t\t\t// <p>^Foo</p> -> ^<p>Foo</p>\n\t\t\t\tconst parent = this.position.parent;\n\n\t\t\t\tthis.position = this.writer.createPositionBefore( parent );\n\n\t\t\t\t// Special case – parent is empty (<p>^</p>).\n\t\t\t\t//\n\t\t\t\t// 1. parent.isEmpty\n\t\t\t\t// We can remove the element after moving insertion position out of it.\n\t\t\t\t//\n\t\t\t\t// 2. parent.parent === allowedIn\n\t\t\t\t// However parent should remain in place when allowed element is above limit element in document tree.\n\t\t\t\t// For example there shouldn't be allowed to remove empty paragraph from tableCell, when is pasted\n\t\t\t\t// content allowed in $root.\n\t\t\t\tif ( parent.isEmpty && parent.parent === allowedIn ) {\n\t\t\t\t\tthis.writer.remove( parent );\n\t\t\t\t}\n\t\t\t} else if ( this.position.isAtEnd ) {\n\t\t\t\t// If insertion position is at the end of the parent, move it out instead of splitting.\n\t\t\t\t// <p>Foo^</p> -> <p>Foo</p>^\n\t\t\t\tthis.position = this.writer.createPositionAfter( this.position.parent );\n\t\t\t} else {\n\t\t\t\tconst tempPos = this.writer.createPositionAfter( this.position.parent );\n\n\t\t\t\tthis._setAffectedBoundaries( this.position );\n\t\t\t\tthis.writer.split( this.position );\n\n\t\t\t\tthis.position = tempPos;\n\n\t\t\t\tthis.canMergeWith.add( this.position.nodeAfter );\n\t\t\t}\n\t\t}\n\n\t\treturn true;\n\t}\n\n\t/**\n\t * Gets the element in which the given node is allowed. It checks the passed element and all its ancestors.\n\t *\n\t * @private\n\t * @param {module:engine/model/node~Node} node The node to check.\n\t * @param {module:engine/model/element~Element} element The element in which the node's correctness should be checked.\n\t * @returns {module:engine/model/element~Element|null}\n\t */\n\t_getAllowedIn( node, element ) {\n\t\tif ( this.schema.checkChild( element, node ) ) {\n\t\t\treturn element;\n\t\t}\n\n\t\tif ( element.parent ) {\n\t\t\treturn this._getAllowedIn( node, element.parent );\n\t\t}\n\n\t\treturn null;\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module engine/model/utils/deletecontent\n */\n\nimport LivePosition from '../liveposition';\nimport Range from '../range';\nimport DocumentSelection from '../documentselection';\n\n/**\n * Deletes content of the selection and merge siblings. The resulting selection is always collapsed.\n *\n * **Note:** Use {@link module:engine/model/model~Model#deleteContent} instead of this function.\n * This function is only exposed to be reusable in algorithms\n * which change the {@link module:engine/model/model~Model#deleteContent}\n * method's behavior.\n *\n * @param {module:engine/model/model~Model} model The model in context of which the insertion\n * should be performed.\n * @param {module:engine/model/selection~Selection|module:engine/model/documentselection~DocumentSelection} selection\n * Selection of which the content should be deleted.\n * @param {Object} [options]\n * @param {Boolean} [options.leaveUnmerged=false] Whether to merge elements after removing the content of the selection.\n *\n * For example `<heading>x[x</heading><paragraph>y]y</paragraph>` will become:\n *\n * * `<heading>x^y</heading>` with the option disabled (`leaveUnmerged == false`)\n * * `<heading>x^</heading><paragraph>y</paragraph>` with enabled (`leaveUnmerged == true`).\n *\n * Note: {@link module:engine/model/schema~Schema#isObject object} and {@link module:engine/model/schema~Schema#isLimit limit}\n * elements will not be merged.\n *\n * @param {Boolean} [options.doNotResetEntireContent=false] Whether to skip replacing the entire content with a\n * paragraph when the entire content was selected.\n *\n * For example `<heading>[x</heading><paragraph>y]</paragraph>` will become:\n *\n * * `<paragraph>^</paragraph>` with the option disabled (`doNotResetEntireContent == false`)\n * * `<heading>^</heading>` with enabled (`doNotResetEntireContent == true`).\n *\n * @param {Boolean} [options.doNotAutoparagraph=false] Whether to create a paragraph if after content deletion selection is moved\n * to a place where text cannot be inserted.\n *\n * For example `<paragraph>x</paragraph>[<image src=\"foo.jpg\"></image>]` will become:\n *\n * * `<paragraph>x</paragraph><paragraph>[]</paragraph>` with the option disabled (`doNotAutoparagraph == false`)\n * * `<paragraph>x</paragraph>[]` with the option enabled (`doNotAutoparagraph == true`).\n *\n * If you use this option you need to make sure to handle invalid selections yourself or leave\n * them to the selection post-fixer (may not always work).\n *\n * **Note:** if there is no valid position for the selection, the paragraph will always be created:\n *\n * `[<image src=\"foo.jpg\"></image>]` -> `<paragraph>[]</paragraph>`.\n */\nexport default function deleteContent( model, selection, options = {} ) {\n\tif ( selection.isCollapsed ) {\n\t\treturn;\n\t}\n\n\tconst selRange = selection.getFirstRange();\n\n\t// If the selection is already removed, don't do anything.\n\tif ( selRange.root.rootName == '$graveyard' ) {\n\t\treturn;\n\t}\n\n\tconst schema = model.schema;\n\n\tmodel.change( writer => {\n\t\t// 1. Replace the entire content with paragraph.\n\t\t// See: https://github.com/ckeditor/ckeditor5-engine/issues/1012#issuecomment-315017594.\n\t\tif ( !options.doNotResetEntireContent && shouldEntireContentBeReplacedWithParagraph( schema, selection ) ) {\n\t\t\treplaceEntireContentWithParagraph( writer, selection, schema );\n\n\t\t\treturn;\n\t\t}\n\n\t\t// Get the live positions for the range adjusted to span only blocks selected from the user perspective.\n\t\tconst [ startPosition, endPosition ] = getLivePositionsForSelectedBlocks( selRange );\n\n\t\t// 2. Remove the content if there is any.\n\t\tif ( !startPosition.isTouching( endPosition ) ) {\n\t\t\twriter.remove( writer.createRange( startPosition, endPosition ) );\n\t\t}\n\n\t\t// 3. Merge elements in the right branch to the elements in the left branch.\n\t\t// The only reasonable (in terms of data and selection correctness) case in which we need to do that is:\n\t\t//\n\t\t// <heading type=1>Fo[</heading><paragraph>]ar</paragraph> => <heading type=1>Fo^ar</heading>\n\t\t//\n\t\t// However, the algorithm supports also merging deeper structures (up to the depth of the shallower branch),\n\t\t// as it's hard to imagine what should actually be the default behavior. Usually, specific features will\n\t\t// want to override that behavior anyway.\n\t\tif ( !options.leaveUnmerged ) {\n\t\t\tmergeBranches( writer, startPosition, endPosition );\n\n\t\t\t// TMP this will be replaced with a postfixer.\n\t\t\t// We need to check and strip disallowed attributes in all nested nodes because after merge\n\t\t\t// some attributes could end up in a path where are disallowed.\n\t\t\t//\n\t\t\t// e.g. bold is disallowed for <H1>\n\t\t\t// <h1>Fo{o</h1><p>b}a<b>r</b><p> -> <h1>Fo{}a<b>r</b><h1> -> <h1>Fo{}ar<h1>.\n\t\t\tschema.removeDisallowedAttributes( startPosition.parent.getChildren(), writer );\n\t\t}\n\n\t\tcollapseSelectionAt( writer, selection, startPosition );\n\n\t\t// 4. Add a paragraph to set selection in it.\n\t\t// Check if a text is allowed in the new container. If not, try to create a new paragraph (if it's allowed here).\n\t\t// If autoparagraphing is off, we assume that you know what you do so we leave the selection wherever it was.\n\t\tif ( !options.doNotAutoparagraph && shouldAutoparagraph( schema, startPosition ) ) {\n\t\t\tinsertParagraph( writer, startPosition, selection );\n\t\t}\n\n\t\tstartPosition.detach();\n\t\tendPosition.detach();\n\t} );\n}\n\n// Returns the live positions for the range adjusted to span only blocks selected from the user perspective. Example:\n//\n//     <heading1>[foo</heading1>\n//     <paragraph>bar</paragraph>\n//     <heading1>]abc</heading1>  <-- this block is not considered as selected\n//\n// This is the same behavior as in Selection#getSelectedBlocks() \"special case\".\nfunction getLivePositionsForSelectedBlocks( range ) {\n\tconst model = range.root.document.model;\n\n\tconst startPosition = range.start;\n\tlet endPosition = range.end;\n\n\t// If the end of selection is at the start position of last block in the selection, then\n\t// shrink it to not include that trailing block. Note that this should happen only for not empty selection.\n\tif ( model.hasContent( range, { ignoreMarkers: true } ) ) {\n\t\tconst endBlock = getParentBlock( endPosition );\n\n\t\tif ( endBlock && endPosition.isTouching( model.createPositionAt( endBlock, 0 ) ) ) {\n\t\t\t// Create forward selection as a probe to find a valid position after excluding last block from the range.\n\t\t\tconst selection = model.createSelection( range );\n\n\t\t\t// Modify the forward selection in backward direction to shrink it and remove first position of following block from it.\n\t\t\t// This is how modifySelection works and here we are making use of it.\n\t\t\tmodel.modifySelection( selection, { direction: 'backward' } );\n\n\t\t\tendPosition = selection.getLastPosition();\n\t\t}\n\t}\n\n\treturn [\n\t\tLivePosition.fromPosition( startPosition, 'toPrevious' ),\n\t\tLivePosition.fromPosition( endPosition, 'toNext' )\n\t];\n}\n\n// Finds the lowest element in position's ancestors which is a block.\n// Returns null if a limit element is encountered before reaching a block element.\nfunction getParentBlock( position ) {\n\tconst element = position.parent;\n\tconst schema = element.root.document.model.schema;\n\tconst ancestors = element.getAncestors( { parentFirst: true, includeSelf: true } );\n\n\tfor ( const element of ancestors ) {\n\t\tif ( schema.isLimit( element ) ) {\n\t\t\treturn null;\n\t\t}\n\n\t\tif ( schema.isBlock( element ) ) {\n\t\t\treturn element;\n\t\t}\n\t}\n}\n\n// This function is a result of reaching the Ballmer's peak for just the right amount of time.\n// Even I had troubles documenting it after a while and after reading it again I couldn't believe that it really works.\nfunction mergeBranches( writer, startPosition, endPosition ) {\n\tconst model = writer.model;\n\n\t// Verify if there is a need and possibility to merge.\n\tif ( !checkShouldMerge( writer.model.schema, startPosition, endPosition ) ) {\n\t\treturn;\n\t}\n\n\t// If the start element on the common ancestor level is empty, and the end element on the same level is not empty\n\t// then merge those to the right element so that it's properties are preserved (name, attributes).\n\t// Because of OT merging is used instead of removing elements.\n\t//\n\t// Merge left:\n\t//     <heading1>foo[</heading1>    ->  <heading1>foo[]bar</heading1>\n\t//     <paragraph>]bar</paragraph>  ->               --^\n\t//\n\t// Merge right:\n\t//     <heading1>[</heading1>       ->\n\t//     <paragraph>]bar</paragraph>  ->  <paragraph>[]bar</paragraph>\n\t//\n\t// Merge left:\n\t//     <blockQuote>                     ->  <blockQuote>\n\t//         <heading1>foo[</heading1>    ->      <heading1>foo[]bar</heading1>\n\t//         <paragraph>]bar</paragraph>  ->                   --^\n\t//     </blockQuote>                    ->  </blockQuote>\n\t//\n\t// Merge right:\n\t//     <blockQuote>                     ->  <blockQuote>\n\t//         <heading1>[</heading1>       ->\n\t//         <paragraph>]bar</paragraph>  ->      <paragraph>[]bar</paragraph>\n\t//     </blockQuote>                    ->  </blockQuote>\n\n\t// Merging should not go deeper than common ancestor.\n\tconst [ startAncestor, endAncestor ] = getAncestorsJustBelowCommonAncestor( startPosition, endPosition );\n\n\t// Branches can't be merged if one of the positions is directly inside a common ancestor.\n\t//\n\t// Example:\n\t//     <blockQuote>\n\t//         <paragraph>[foo</paragraph>]\n\t//         <table> ... </table>\n\t//     <blockQuote>\n\t//\n\tif ( !startAncestor || !endAncestor ) {\n\t\treturn;\n\t}\n\n\tif ( !model.hasContent( startAncestor, { ignoreMarkers: true } ) && model.hasContent( endAncestor, { ignoreMarkers: true } ) ) {\n\t\tmergeBranchesRight( writer, startPosition, endPosition, startAncestor.parent );\n\t} else {\n\t\tmergeBranchesLeft( writer, startPosition, endPosition, startAncestor.parent );\n\t}\n}\n\n// Merging blocks to the left (properties of the left block are preserved).\n// Simple example:\n//     <heading1>foo[</heading1>    ->  <heading1>foo[bar</heading1>]\n//     <paragraph>]bar</paragraph>  ->              --^\n//\n// Nested example:\n//     <blockQuote>                     ->  <blockQuote>\n//         <heading1>foo[</heading1>    ->      <heading1>foo[bar</heading1>\n//     </blockQuote>                    ->  </blockQuote>]    ^\n//     <blockBlock>                     ->                    |\n//         <paragraph>]bar</paragraph>  ->                 ---\n//     </blockBlock>                    ->\n//\nfunction mergeBranchesLeft( writer, startPosition, endPosition, commonAncestor ) {\n\tconst startElement = startPosition.parent;\n\tconst endElement = endPosition.parent;\n\n\t// Merging reached the common ancestor element, stop here.\n\tif ( startElement == commonAncestor || endElement == commonAncestor ) {\n\t\treturn;\n\t}\n\n\t// Remember next positions to merge in next recursive step (also used as modification points pointers).\n\tstartPosition = writer.createPositionAfter( startElement );\n\tendPosition = writer.createPositionBefore( endElement );\n\n\t// Move endElement just after startElement if they aren't siblings.\n\tif ( !endPosition.isEqual( startPosition ) ) {\n\t\t//\n\t\t//     <blockQuote>                     ->  <blockQuote>\n\t\t//         <heading1>foo[</heading1>    ->      <heading1>foo</heading1>[<paragraph>bar</paragraph>\n\t\t//     </blockQuote>                    ->  </blockQuote>                ^\n\t\t//     <blockBlock>                     ->  <blockBlock>                 |\n\t\t//         <paragraph>]bar</paragraph>  ->      ]                     ---\n\t\t//     </blockBlock>                    ->  </blockBlock>\n\t\t//\n\t\twriter.insert( endElement, startPosition );\n\t}\n\n\t// Merge two siblings (nodes on sides of startPosition):\n\t//\n\t//     <blockQuote>                                             ->  <blockQuote>\n\t//         <heading1>foo</heading1>[<paragraph>bar</paragraph>  ->      <heading1>foo[bar</heading1>\n\t//     </blockQuote>                                            ->  </blockQuote>\n\t//     <blockBlock>                                             ->  <blockBlock>\n\t//         ]                                                    ->      ]\n\t//     </blockBlock>                                            ->  </blockBlock>\n\t//\n\t// Or in simple case (without moving elements in above if):\n\t//     <heading1>foo</heading1>[<paragraph>bar</paragraph>]  ->  <heading1>foo[bar</heading1>]\n\t//\n\twriter.merge( startPosition );\n\n\t// Remove empty end ancestors:\n\t//\n\t//     <blockQuote>                      ->  <blockQuote>\n\t//         <heading1>foo[bar</heading1>  ->      <heading1>foo[bar</heading1>\n\t//     </blockQuote>                     ->  </blockQuote>\n\t//     <blockBlock>                      ->\n\t//         ]                             ->  ]\n\t//     </blockBlock>                     ->\n\t//\n\twhile ( endPosition.parent.isEmpty ) {\n\t\tconst parentToRemove = endPosition.parent;\n\n\t\tendPosition = writer.createPositionBefore( parentToRemove );\n\n\t\twriter.remove( parentToRemove );\n\t}\n\n\t// Verify if there is a need and possibility to merge next level.\n\tif ( !checkShouldMerge( writer.model.schema, startPosition, endPosition ) ) {\n\t\treturn;\n\t}\n\n\t// Continue merging next level (blockQuote with blockBlock in the examples above if it would not be empty and got removed).\n\tmergeBranchesLeft( writer, startPosition, endPosition, commonAncestor );\n}\n\n// Merging blocks to the right (properties of the right block are preserved).\n// Simple example:\n//     <heading1>foo[</heading1>    ->            --v\n//     <paragraph>]bar</paragraph>  ->  [<paragraph>foo]bar</paragraph>\n//\n// Nested example:\n//     <blockQuote>                     ->\n//         <heading1>foo[</heading1>    ->              ---\n//     </blockQuote>                    ->                 |\n//     <blockBlock>                     ->  [<blockBlock>  v\n//         <paragraph>]bar</paragraph>  ->      <paragraph>foo]bar</paragraph>\n//     </blockBlock>                    ->  </blockBlock>\n//\nfunction mergeBranchesRight( writer, startPosition, endPosition, commonAncestor ) {\n\tconst startElement = startPosition.parent;\n\tconst endElement = endPosition.parent;\n\n\t// Merging reached the common ancestor element, stop here.\n\tif ( startElement == commonAncestor || endElement == commonAncestor ) {\n\t\treturn;\n\t}\n\n\t// Remember next positions to merge in next recursive step (also used as modification points pointers).\n\tstartPosition = writer.createPositionAfter( startElement );\n\tendPosition = writer.createPositionBefore( endElement );\n\n\t// Move startElement just before endElement if they aren't siblings.\n\tif ( !endPosition.isEqual( startPosition ) ) {\n\t\t//\n\t\t//     <blockQuote>                     ->  <blockQuote>\n\t\t//         <heading1>foo[</heading1>    ->      [                   ---\n\t\t//     </blockQuote>                    ->  </blockQuote>              |\n\t\t//     <blockBlock>                     ->  <blockBlock>               v\n\t\t//         <paragraph>]bar</paragraph>  ->      <heading1>foo</heading1>]<paragraph>bar</paragraph>\n\t\t//     </blockBlock>                    ->  </blockBlock>\n\t\t//\n\t\twriter.insert( startElement, endPosition );\n\t}\n\n\t// Remove empty end ancestors:\n\t//\n\t//     <blockQuote>                                             ->\n\t//         [                                                    ->  [\n\t//     </blockQuote>                                            ->\n\t//     <blockBlock>                                             ->  <blockBlock>\n\t//         <heading1>foo</heading1>]<paragraph>bar</paragraph>  ->      <heading1>foo</heading1>]<paragraph>bar</paragraph>\n\t//     </blockBlock>                                            ->  </blockBlock>\n\t//\n\twhile ( startPosition.parent.isEmpty ) {\n\t\tconst parentToRemove = startPosition.parent;\n\n\t\tstartPosition = writer.createPositionBefore( parentToRemove );\n\n\t\twriter.remove( parentToRemove );\n\t}\n\n\t// Update endPosition after inserting and removing elements.\n\tendPosition = writer.createPositionBefore( endElement );\n\n\t// Merge right two siblings (nodes on sides of endPosition):\n\t//                                                              ->\n\t//     [                                                        ->  [\n\t//                                                              ->\n\t//     <blockBlock>                                             ->  <blockBlock>\n\t//         <heading1>foo</heading1>]<paragraph>bar</paragraph>  ->      <paragraph>foo]bar</paragraph>\n\t//     </blockBlock>                                            ->  </blockBlock>\n\t//\n\t// Or in simple case (without moving elements in above if):\n\t//     [<heading1>foo</heading1>]<paragraph>bar</paragraph>  ->  [<heading1>foo]bar</heading1>\n\t//\n\tmergeRight( writer, endPosition );\n\n\t// Verify if there is a need and possibility to merge next level.\n\tif ( !checkShouldMerge( writer.model.schema, startPosition, endPosition ) ) {\n\t\treturn;\n\t}\n\n\t// Continue merging next level (blockQuote with blockBlock in the examples above if it would not be empty and got removed).\n\tmergeBranchesRight( writer, startPosition, endPosition, commonAncestor );\n}\n\n// There is no right merge operation so we need to simulate it.\nfunction mergeRight( writer, position ) {\n\tconst startElement = position.nodeBefore;\n\tconst endElement = position.nodeAfter;\n\n\tif ( startElement.name != endElement.name ) {\n\t\twriter.rename( startElement, endElement.name );\n\t}\n\n\twriter.clearAttributes( startElement );\n\twriter.setAttributes( Object.fromEntries( endElement.getAttributes() ), startElement );\n\n\twriter.merge( position );\n}\n\n// Verifies if merging is needed and possible. It's not needed if both positions are in the same element\n// and it's not possible if some element is a limit or the range crosses a limit element.\nfunction checkShouldMerge( schema, startPosition, endPosition ) {\n\tconst startElement = startPosition.parent;\n\tconst endElement = endPosition.parent;\n\n\t// If both positions ended up in the same parent, then there's nothing more to merge:\n\t// <$root><p>x[</p><p>]y</p></$root> => <$root><p>xy</p>[]</$root>\n\tif ( startElement == endElement ) {\n\t\treturn false;\n\t}\n\n\t// If one of the positions is a limit element, then there's nothing to merge because we don't want to cross the limit boundaries.\n\tif ( schema.isLimit( startElement ) || schema.isLimit( endElement ) ) {\n\t\treturn false;\n\t}\n\n\t// Check if operations we'll need to do won't need to cross object or limit boundaries.\n\t// E.g., we can't merge endElement into startElement in this case:\n\t// <limit><startElement>x[</startElement></limit><endElement>]</endElement>\n\treturn isCrossingLimitElement( startPosition, endPosition, schema );\n}\n\n// Returns the elements that are the ancestors of the provided positions that are direct children of the common ancestor.\nfunction getAncestorsJustBelowCommonAncestor( positionA, positionB ) {\n\tconst ancestorsA = positionA.getAncestors();\n\tconst ancestorsB = positionB.getAncestors();\n\n\tlet i = 0;\n\n\twhile ( ancestorsA[ i ] && ancestorsA[ i ] == ancestorsB[ i ] ) {\n\t\ti++;\n\t}\n\n\treturn [ ancestorsA[ i ], ancestorsB[ i ] ];\n}\n\nfunction shouldAutoparagraph( schema, position ) {\n\tconst isTextAllowed = schema.checkChild( position, '$text' );\n\tconst isParagraphAllowed = schema.checkChild( position, 'paragraph' );\n\n\treturn !isTextAllowed && isParagraphAllowed;\n}\n\n// Check if parents of two positions can be merged by checking if there are no limit/object\n// boundaries between those two positions.\n//\n// E.g. in <bQ><p>x[]</p></bQ><widget><caption>{}</caption></widget>\n// we'll check <p>, <bQ>, <widget> and <caption>.\n// Usually, widget and caption are marked as objects/limits in the schema, so in this case merging will be blocked.\nfunction isCrossingLimitElement( leftPos, rightPos, schema ) {\n\tconst rangeToCheck = new Range( leftPos, rightPos );\n\n\tfor ( const value of rangeToCheck.getWalker() ) {\n\t\tif ( schema.isLimit( value.item ) ) {\n\t\t\treturn false;\n\t\t}\n\t}\n\n\treturn true;\n}\n\nfunction insertParagraph( writer, position, selection ) {\n\tconst paragraph = writer.createElement( 'paragraph' );\n\n\twriter.insert( paragraph, position );\n\n\tcollapseSelectionAt( writer, selection, writer.createPositionAt( paragraph, 0 ) );\n}\n\nfunction replaceEntireContentWithParagraph( writer, selection ) {\n\tconst limitElement = writer.model.schema.getLimitElement( selection );\n\n\twriter.remove( writer.createRangeIn( limitElement ) );\n\tinsertParagraph( writer, writer.createPositionAt( limitElement, 0 ), selection );\n}\n\n// We want to replace the entire content with a paragraph when:\n// * the entire content is selected,\n// * selection contains at least two elements,\n// * whether the paragraph is allowed in schema in the common ancestor.\nfunction shouldEntireContentBeReplacedWithParagraph( schema, selection ) {\n\tconst limitElement = schema.getLimitElement( selection );\n\n\tif ( !selection.containsEntireContent( limitElement ) ) {\n\t\treturn false;\n\t}\n\n\tconst range = selection.getFirstRange();\n\n\tif ( range.start.parent == range.end.parent ) {\n\t\treturn false;\n\t}\n\n\treturn schema.checkChild( limitElement, 'paragraph' );\n}\n\n// Helper function that sets the selection. Depending whether given `selection` is a document selection or not,\n// uses a different method to set it.\nfunction collapseSelectionAt( writer, selection, positionOrRange ) {\n\tif ( selection instanceof DocumentSelection ) {\n\t\twriter.setSelection( positionOrRange );\n\t} else {\n\t\tselection.setTo( positionOrRange );\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module engine/model/utils/modifyselection\n */\n\nimport Position from '../position';\nimport TreeWalker from '../treewalker';\nimport Range from '../range';\nimport { isInsideSurrogatePair, isInsideCombinedSymbol } from '@ckeditor/ckeditor5-utils/src/unicode';\nimport DocumentSelection from '../documentselection';\n\nconst wordBoundaryCharacters = ' ,.?!:;\"-()';\n\n/**\n * Modifies the selection. Currently, the supported modifications are:\n *\n * * Extending. The selection focus is moved in the specified `options.direction` with a step specified in `options.unit`.\n * Possible values for `unit` are:\n *  * `'character'` (default) - moves selection by one user-perceived character. In most cases this means moving by one\n *  character in `String` sense. However, unicode also defines \"combing marks\". These are special symbols, that combines\n *  with a symbol before it (\"base character\") to create one user-perceived character. For example, `q̣̇` is a normal\n *  letter `q` with two \"combining marks\": upper dot (`Ux0307`) and lower dot (`Ux0323`). For most actions, i.e. extending\n *  selection by one position, it is correct to include both \"base character\" and all of it's \"combining marks\". That is\n *  why `'character'` value is most natural and common method of modifying selection.\n *  * `'codePoint'` - moves selection by one unicode code point. In contrary to, `'character'` unit, this will insert\n *  selection between \"base character\" and \"combining mark\", because \"combining marks\" have their own unicode code points.\n *  However, for technical reasons, unicode code points with values above `UxFFFF` are represented in native `String` by\n *  two characters, called \"surrogate pairs\". Halves of \"surrogate pairs\" have a meaning only when placed next to each other.\n *  For example `𨭎` is represented in `String` by `\\uD862\\uDF4E`. Both `\\uD862` and `\\uDF4E` do not have any meaning\n *  outside the pair (are rendered as ? when alone). Position between them would be incorrect. In this case, selection\n *  extension will include whole \"surrogate pair\".\n *  * `'word'` - moves selection by a whole word.\n *\n * **Note:** if you extend a forward selection in a backward direction you will in fact shrink it.\n *\n * **Note:** Use {@link module:engine/model/model~Model#modifySelection} instead of this function.\n * This function is only exposed to be reusable in algorithms\n * which change the {@link module:engine/model/model~Model#modifySelection}\n * method's behavior.\n *\n * @param {module:engine/model/model~Model} model The model in context of which\n * the selection modification should be performed.\n * @param {module:engine/model/selection~Selection|module:engine/model/documentselection~DocumentSelection} selection\n * The selection to modify.\n * @param {Object} [options]\n * @param {'forward'|'backward'} [options.direction='forward'] The direction in which the selection should be modified.\n * @param {'character'|'codePoint'|'word'} [options.unit='character'] The unit by which selection should be modified.\n */\nexport default function modifySelection( model, selection, options = {} ) {\n\tconst schema = model.schema;\n\tconst isForward = options.direction != 'backward';\n\tconst unit = options.unit ? options.unit : 'character';\n\n\tconst focus = selection.focus;\n\n\tconst walker = new TreeWalker( {\n\t\tboundaries: getSearchRange( focus, isForward ),\n\t\tsingleCharacters: true,\n\t\tdirection: isForward ? 'forward' : 'backward'\n\t} );\n\n\tconst data = { walker, schema, isForward, unit };\n\n\tlet next;\n\n\twhile ( ( next = walker.next() ) ) {\n\t\tif ( next.done ) {\n\t\t\treturn;\n\t\t}\n\n\t\tconst position = tryExtendingTo( data, next.value );\n\n\t\tif ( position ) {\n\t\t\tif ( selection instanceof DocumentSelection ) {\n\t\t\t\tmodel.change( writer => {\n\t\t\t\t\twriter.setSelectionFocus( position );\n\t\t\t\t} );\n\t\t\t} else {\n\t\t\t\tselection.setFocus( position );\n\t\t\t}\n\n\t\t\treturn;\n\t\t}\n\t}\n}\n\n// Checks whether the selection can be extended to the the walker's next value (next position).\n// @param {{ walker, unit, isForward, schema }} data\n// @param {module:engine/view/treewalker~TreeWalkerValue} value\nfunction tryExtendingTo( data, value ) {\n\tconst { isForward, walker, unit, schema } = data;\n\tconst { type, item, nextPosition } = value;\n\n\t// If found text, we can certainly put the focus in it. Let's just find a correct position\n\t// based on the unit.\n\tif ( type == 'text' ) {\n\t\tif ( data.unit === 'word' ) {\n\t\t\treturn getCorrectWordBreakPosition( walker, isForward );\n\t\t}\n\n\t\treturn getCorrectPosition( walker, unit, isForward );\n\t}\n\n\t// Entering an element.\n\tif ( type == ( isForward ? 'elementStart' : 'elementEnd' ) ) {\n\t\t// If it's a selectable, we can select it now.\n\t\tif ( schema.isSelectable( item ) ) {\n\t\t\treturn Position._createAt( item, isForward ? 'after' : 'before' );\n\t\t}\n\n\t\t// If text allowed on this position, extend to this place.\n\t\tif ( schema.checkChild( nextPosition, '$text' ) ) {\n\t\t\treturn nextPosition;\n\t\t}\n\t}\n\t// Leaving an element.\n\telse {\n\t\t// If leaving a limit element, stop.\n\t\tif ( schema.isLimit( item ) ) {\n\t\t\t// NOTE: Fast-forward the walker until the end.\n\t\t\twalker.skip( () => true );\n\n\t\t\treturn;\n\t\t}\n\n\t\t// If text allowed on this position, extend to this place.\n\t\tif ( schema.checkChild( nextPosition, '$text' ) ) {\n\t\t\treturn nextPosition;\n\t\t}\n\t}\n}\n\n// Finds a correct position by walking in a text node and checking whether selection can be extended to given position\n// or should be extended further.\n//\n// @param {module:engine/model/treewalker~TreeWalker} walker\n// @param {String} unit The unit by which selection should be modified.\nfunction getCorrectPosition( walker, unit ) {\n\tconst textNode = walker.position.textNode;\n\n\tif ( textNode ) {\n\t\tconst data = textNode.data;\n\t\tlet offset = walker.position.offset - textNode.startOffset;\n\n\t\twhile ( isInsideSurrogatePair( data, offset ) || ( unit == 'character' && isInsideCombinedSymbol( data, offset ) ) ) {\n\t\t\twalker.next();\n\n\t\t\toffset = walker.position.offset - textNode.startOffset;\n\t\t}\n\t}\n\n\treturn walker.position;\n}\n\n// Finds a correct position of a word break by walking in a text node and checking whether selection can be extended to given position\n// or should be extended further.\n//\n// @param {module:engine/model/treewalker~TreeWalker} walker\n// @param {Boolean} isForward Is the direction in which the selection should be modified is forward.\nfunction getCorrectWordBreakPosition( walker, isForward ) {\n\tlet textNode = walker.position.textNode;\n\n\tif ( textNode ) {\n\t\tlet offset = walker.position.offset - textNode.startOffset;\n\n\t\twhile ( !isAtWordBoundary( textNode.data, offset, isForward ) && !isAtNodeBoundary( textNode, offset, isForward ) ) {\n\t\t\twalker.next();\n\n\t\t\t// Check of adjacent text nodes with different attributes (like BOLD).\n\t\t\t// Example          : 'foofoo []bar<$text bold=\"true\">bar</$text> bazbaz'\n\t\t\t// should expand to : 'foofoo [bar<$text bold=\"true\">bar</$text>] bazbaz'.\n\t\t\tconst nextNode = isForward ? walker.position.nodeAfter : walker.position.nodeBefore;\n\n\t\t\t// Scan only text nodes. Ignore inline elements (like `<softBreak>`).\n\t\t\tif ( nextNode && nextNode.is( '$text' ) ) {\n\t\t\t\t// Check boundary char of an adjacent text node.\n\t\t\t\tconst boundaryChar = nextNode.data.charAt( isForward ? 0 : nextNode.data.length - 1 );\n\n\t\t\t\t// Go to the next node if the character at the boundary of that node belongs to the same word.\n\t\t\t\tif ( !wordBoundaryCharacters.includes( boundaryChar ) ) {\n\t\t\t\t\t// If adjacent text node belongs to the same word go to it & reset values.\n\t\t\t\t\twalker.next();\n\n\t\t\t\t\ttextNode = walker.position.textNode;\n\t\t\t\t}\n\t\t\t}\n\n\t\t\toffset = walker.position.offset - textNode.startOffset;\n\t\t}\n\t}\n\n\treturn walker.position;\n}\n\nfunction getSearchRange( start, isForward ) {\n\tconst root = start.root;\n\tconst searchEnd = Position._createAt( root, isForward ? 'end' : 0 );\n\n\tif ( isForward ) {\n\t\treturn new Range( start, searchEnd );\n\t} else {\n\t\treturn new Range( searchEnd, start );\n\t}\n}\n\n// Checks if selection is on word boundary.\n//\n// @param {String} data The text node value to investigate.\n// @param {Number} offset Position offset.\n// @param {Boolean} isForward Is the direction in which the selection should be modified is forward.\nfunction isAtWordBoundary( data, offset, isForward ) {\n\t// The offset to check depends on direction.\n\tconst offsetToCheck = offset + ( isForward ? 0 : -1 );\n\n\treturn wordBoundaryCharacters.includes( data.charAt( offsetToCheck ) );\n}\n\n// Checks if selection is on node boundary.\n//\n// @param {module:engine/model/text~Text} textNode The text node to investigate.\n// @param {Number} offset Position offset.\n// @param {Boolean} isForward Is the direction in which the selection should be modified is forward.\nfunction isAtNodeBoundary( textNode, offset, isForward ) {\n\treturn offset === ( isForward ? textNode.endOffset : 0 );\n}\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module engine/model/utils/getselectedcontent\n */\n\n/**\n * Gets a clone of the selected content.\n *\n * For example, for the following selection:\n *\n * ```html\n * <p>x</p><quote><p>y</p><h>fir[st</h></quote><p>se]cond</p><p>z</p>\n * ```\n *\n * It will return a document fragment with such a content:\n *\n * ```html\n * <quote><h>st</h></quote><p>se</p>\n * ```\n *\n * @param {module:engine/model/model~Model} model The model in context of which\n * the selection modification should be performed.\n * @param {module:engine/model/selection~Selection|module:engine/model/documentselection~DocumentSelection} selection\n * The selection of which content will be returned.\n * @returns {module:engine/model/documentfragment~DocumentFragment}\n */\nexport default function getSelectedContent( model, selection ) {\n\treturn model.change( writer => {\n\t\tconst frag = writer.createDocumentFragment();\n\t\tconst range = selection.getFirstRange();\n\n\t\tif ( !range || range.isCollapsed ) {\n\t\t\treturn frag;\n\t\t}\n\n\t\tconst root = range.start.root;\n\t\tconst commonPath = range.start.getCommonPath( range.end );\n\t\tconst commonParent = root.getNodeByPath( commonPath );\n\n\t\t// ## 1st step\n\t\t//\n\t\t// First, we'll clone a fragment represented by a minimal flat range\n\t\t// containing the original range to be cloned.\n\t\t// E.g. let's consider such a range:\n\t\t//\n\t\t// <p>x</p><quote><p>y</p><h>fir[st</h></quote><p>se]cond</p><p>z</p>\n\t\t//\n\t\t// A minimal flat range containing this one is:\n\t\t//\n\t\t// <p>x</p>[<quote><p>y</p><h>first</h></quote><p>second</p>]<p>z</p>\n\t\t//\n\t\t// We can easily clone this structure, preserving e.g. the <quote> element.\n\t\tlet flatSubtreeRange;\n\n\t\tif ( range.start.parent == range.end.parent ) {\n\t\t\t// The original range is flat, so take it.\n\t\t\tflatSubtreeRange = range;\n\t\t} else {\n\t\t\tflatSubtreeRange = writer.createRange(\n\t\t\t\twriter.createPositionAt( commonParent, range.start.path[ commonPath.length ] ),\n\t\t\t\twriter.createPositionAt( commonParent, range.end.path[ commonPath.length ] + 1 )\n\t\t\t);\n\t\t}\n\n\t\tconst howMany = flatSubtreeRange.end.offset - flatSubtreeRange.start.offset;\n\n\t\t// Clone the whole contents.\n\t\tfor ( const item of flatSubtreeRange.getItems( { shallow: true } ) ) {\n\t\t\tif ( item.is( '$textProxy' ) ) {\n\t\t\t\twriter.appendText( item.data, item.getAttributes(), frag );\n\t\t\t} else {\n\t\t\t\twriter.append( writer.cloneElement( item, true ), frag );\n\t\t\t}\n\t\t}\n\n\t\t// ## 2nd step\n\t\t//\n\t\t// If the original range wasn't flat, then we need to remove the excess nodes from the both ends of the cloned fragment.\n\t\t//\n\t\t// For example, for the range shown in the 1st step comment, we need to remove these pieces:\n\t\t//\n\t\t// <quote>[<p>y</p>]<h>[fir]st</h></quote><p>se[cond]</p>\n\t\t//\n\t\t// So this will be the final copied content:\n\t\t//\n\t\t// <quote><h>st</h></quote><p>se</p>\n\t\t//\n\t\t// In order to do that, we remove content from these two ranges:\n\t\t//\n\t\t// [<quote><p>y</p><h>fir]st</h></quote><p>se[cond</p>]\n\t\tif ( flatSubtreeRange != range ) {\n\t\t\t// Find the position of the original range in the cloned fragment.\n\t\t\tconst newRange = range._getTransformedByMove( flatSubtreeRange.start, writer.createPositionAt( frag, 0 ), howMany )[ 0 ];\n\n\t\t\tconst leftExcessRange = writer.createRange( writer.createPositionAt( frag, 0 ), newRange.start );\n\t\t\tconst rightExcessRange = writer.createRange( newRange.end, writer.createPositionAt( frag, 'end' ) );\n\n\t\t\tremoveRangeContent( rightExcessRange, writer );\n\t\t\tremoveRangeContent( leftExcessRange, writer );\n\t\t}\n\n\t\treturn frag;\n\t} );\n}\n\n// After https://github.com/ckeditor/ckeditor5-engine/issues/690 is fixed,\n// this function will, most likely, be able to rewritten using getMinimalFlatRanges().\nfunction removeRangeContent( range, writer ) {\n\tconst parentsToCheck = [];\n\n\tArray.from( range.getItems( { direction: 'backward' } ) )\n\t\t// We should better store ranges because text proxies will lose integrity\n\t\t// with the text nodes when we'll start removing content.\n\t\t.map( item => writer.createRangeOn( item ) )\n\t\t// Filter only these items which are fully contained in the passed range.\n\t\t//\n\t\t// E.g. for the following range: [<quote><p>y</p><h>fir]st</h>\n\t\t// the walker will return the entire <h> element, when only the \"fir\" item inside it is fully contained.\n\t\t.filter( itemRange => {\n\t\t\t// We should be able to use Range.containsRange, but https://github.com/ckeditor/ckeditor5-engine/issues/691.\n\t\t\tconst contained =\n\t\t\t\t( itemRange.start.isAfter( range.start ) || itemRange.start.isEqual( range.start ) ) &&\n\t\t\t\t( itemRange.end.isBefore( range.end ) || itemRange.end.isEqual( range.end ) );\n\n\t\t\treturn contained;\n\t\t} )\n\t\t.forEach( itemRange => {\n\t\t\tparentsToCheck.push( itemRange.start.parent );\n\n\t\t\twriter.remove( itemRange );\n\t\t} );\n\n\t// Remove ancestors of the removed items if they turned to be empty now\n\t// (their whole content was contained in the range).\n\tparentsToCheck.forEach( parentToCheck => {\n\t\tlet parent = parentToCheck;\n\n\t\twhile ( parent.parent && parent.isEmpty ) {\n\t\t\tconst removeRange = writer.createRangeOn( parent );\n\n\t\t\tparent = parent.parent;\n\n\t\t\twriter.remove( removeRange );\n\t\t}\n\t} );\n}\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module engine/model/utils/selection-post-fixer\n */\n\nimport Range from '../range';\nimport Position from '../position';\n\n/**\n * Injects selection post-fixer to the model.\n *\n * The role of the selection post-fixer is to ensure that the selection is in a correct place\n * after a {@link module:engine/model/model~Model#change `change()`} block was executed.\n *\n * The correct position means that:\n *\n * * All collapsed selection ranges are in a place where the {@link module:engine/model/schema~Schema}\n * allows a `$text`.\n * * None of the selection's non-collapsed ranges crosses a {@link module:engine/model/schema~Schema#isLimit limit element}\n * boundary (a range must be rooted within one limit element).\n * * Only {@link module:engine/model/schema~Schema#isSelectable selectable elements} can be selected from the outside\n * (e.g. `[<paragraph>foo</paragraph>]` is invalid). This rule applies independently to both selection ends, so this\n * selection is correct: `<paragraph>f[oo</paragraph><image></image>]`.\n *\n * If the position is not correct, the post-fixer will automatically correct it.\n *\n * ## Fixing a non-collapsed selection\n *\n * See as an example a selection that starts in a P1 element and ends inside the text of a TD element\n * (`[` and `]` are range boundaries and `(l)` denotes an element defined as `isLimit=true`):\n *\n *\t\troot\n *\t\t |- element P1\n *\t\t |   |- \"foo\"                                      root\n *\t\t |- element TABLE (l)                   P1         TABLE             P2\n *\t\t |   |- element TR (l)                 f o[o     TR      TR         b a r\n *\t\t |   |   |- element TD (l)                       TD      TD\n *\t\t |   |       |- \"aaa\"                          a]a a    b b b\n *\t\t |   |- element TR (l)\n *\t\t |   |   |- element TD (l)                           ||\n *\t\t |   |       |- \"bbb\"                                ||\n *\t\t |- element P2                                       VV\n *\t\t |   |- \"bar\"\n *\t\t                                                   root\n *\t\t                                        P1         TABLE]            P2\n *\t\t                                       f o[o     TR      TR         b a r\n *\t\t                                                 TD      TD\n *\t\t                                               a a a    b b b\n *\n * In the example above, the TABLE, TR and TD are defined as `isLimit=true` in the schema. The range which is not contained within\n * a single limit element must be expanded to select the outermost limit element. The range end is inside the text node of the TD element.\n * As the TD element is a child of the TR and TABLE elements, where both are defined as `isLimit=true` in the schema, the range must be\n * expanded to select the whole TABLE element.\n *\n * **Note** If the selection contains multiple ranges, the method returns a minimal set of ranges that are not intersecting after expanding\n * them to select `isLimit=true` elements.\n *\n * @param {module:engine/model/model~Model} model\n */\nexport function injectSelectionPostFixer( model ) {\n\tmodel.document.registerPostFixer( writer => selectionPostFixer( writer, model ) );\n}\n\n// The selection post-fixer.\n//\n// @param {module:engine/model/writer~Writer} writer\n// @param {module:engine/model/model~Model} model\nfunction selectionPostFixer( writer, model ) {\n\tconst selection = model.document.selection;\n\tconst schema = model.schema;\n\n\tconst ranges = [];\n\n\tlet wasFixed = false;\n\n\tfor ( const modelRange of selection.getRanges() ) {\n\t\t// Go through all ranges in selection and try fixing each of them.\n\t\t// Those ranges might overlap but will be corrected later.\n\t\tconst correctedRange = tryFixingRange( modelRange, schema );\n\n\t\t// \"Selection fixing\" algorithms sometimes get lost. In consequence, it may happen\n\t\t// that a new range is returned but, in fact, it has the same positions as the original\n\t\t// range anyway. If this range is not discarded, a new selection will be set and that,\n\t\t// for instance, would destroy the selection attributes. Let's make sure that the post-fixer\n\t\t// actually worked first before setting a new selection.\n\t\t//\n\t\t// https://github.com/ckeditor/ckeditor5/issues/6693\n\t\tif ( correctedRange && !correctedRange.isEqual( modelRange ) ) {\n\t\t\tranges.push( correctedRange );\n\t\t\twasFixed = true;\n\t\t} else {\n\t\t\tranges.push( modelRange );\n\t\t}\n\t}\n\n\t// If any of ranges were corrected update the selection.\n\tif ( wasFixed ) {\n\t\twriter.setSelection( mergeIntersectingRanges( ranges ), { backward: selection.isBackward } );\n\t}\n}\n\n// Tries fixing a range if it's incorrect.\n//\n// @param {module:engine/model/range~Range} range\n// @param {module:engine/model/schema~Schema} schema\n// @returns {module:engine/model/range~Range|null} Returns fixed range or null if range is valid.\nfunction tryFixingRange( range, schema ) {\n\tif ( range.isCollapsed ) {\n\t\treturn tryFixingCollapsedRange( range, schema );\n\t}\n\n\treturn tryFixingNonCollapsedRage( range, schema );\n}\n\n// Tries to fix collapsed ranges.\n//\n// * Fixes situation when a range is in a place where $text is not allowed\n//\n// @param {module:engine/model/range~Range} range Collapsed range to fix.\n// @param {module:engine/model/schema~Schema} schema\n// @returns {module:engine/model/range~Range|null} Returns fixed range or null if range is valid.\nfunction tryFixingCollapsedRange( range, schema ) {\n\tconst originalPosition = range.start;\n\n\tconst nearestSelectionRange = schema.getNearestSelectionRange( originalPosition );\n\n\t// This might be null ie when editor data is empty.\n\t// In such cases there is no need to fix the selection range.\n\tif ( !nearestSelectionRange ) {\n\t\treturn null;\n\t}\n\n\tif ( !nearestSelectionRange.isCollapsed ) {\n\t\treturn nearestSelectionRange;\n\t}\n\n\tconst fixedPosition = nearestSelectionRange.start;\n\n\t// Fixed position is the same as original - no need to return corrected range.\n\tif ( originalPosition.isEqual( fixedPosition ) ) {\n\t\treturn null;\n\t}\n\n\treturn new Range( fixedPosition );\n}\n\n// Tries to fix an expanded range.\n//\n// @param {module:engine/model/range~Range} range Expanded range to fix.\n// @param {module:engine/model/schema~Schema} schema\n// @returns {module:engine/model/range~Range|null} Returns fixed range or null if range is valid.\nfunction tryFixingNonCollapsedRage( range, schema ) {\n\tconst { start, end } = range;\n\n\tconst isTextAllowedOnStart = schema.checkChild( start, '$text' );\n\tconst isTextAllowedOnEnd = schema.checkChild( end, '$text' );\n\n\tconst startLimitElement = schema.getLimitElement( start );\n\tconst endLimitElement = schema.getLimitElement( end );\n\n\t// Ranges which both end are inside the same limit element (or root) might needs only minor fix.\n\tif ( startLimitElement === endLimitElement ) {\n\t\t// Range is valid when both position allows to place a text:\n\t\t// - <block>f[oobarba]z</block>\n\t\t// This would be \"fixed\" by a next check but as it will be the same it's better to return null so the selection stays the same.\n\t\tif ( isTextAllowedOnStart && isTextAllowedOnEnd ) {\n\t\t\treturn null;\n\t\t}\n\n\t\t// Range that is on non-limit element (or is partially) must be fixed so it is placed inside the block around $text:\n\t\t// - [<block>foo</block>]    ->    <block>[foo]</block>\n\t\t// - [<block>foo]</block>    ->    <block>[foo]</block>\n\t\t// - <block>f[oo</block>]    ->    <block>f[oo]</block>\n\t\t// - [<block>foo</block><selectable></selectable>]    ->    <block>[foo</block><selectable></selectable>]\n\t\tif ( checkSelectionOnNonLimitElements( start, end, schema ) ) {\n\t\t\tconst isStartBeforeSelectable = start.nodeAfter && schema.isSelectable( start.nodeAfter );\n\t\t\tconst fixedStart = isStartBeforeSelectable ? null : schema.getNearestSelectionRange( start, 'forward' );\n\n\t\t\tconst isEndAfterSelectable = end.nodeBefore && schema.isSelectable( end.nodeBefore );\n\t\t\tconst fixedEnd = isEndAfterSelectable ? null : schema.getNearestSelectionRange( end, 'backward' );\n\n\t\t\t// The schema.getNearestSelectionRange might return null - if that happens use original position.\n\t\t\tconst rangeStart = fixedStart ? fixedStart.start : start;\n\t\t\tconst rangeEnd = fixedEnd ? fixedEnd.end : end;\n\n\t\t\treturn new Range( rangeStart, rangeEnd );\n\t\t}\n\t}\n\n\tconst isStartInLimit = startLimitElement && !startLimitElement.is( 'rootElement' );\n\tconst isEndInLimit = endLimitElement && !endLimitElement.is( 'rootElement' );\n\n\t// At this point we eliminated valid positions on text nodes so if one of range positions is placed inside a limit element\n\t// then the range crossed limit element boundaries and needs to be fixed.\n\tif ( isStartInLimit || isEndInLimit ) {\n\t\tconst bothInSameParent = ( start.nodeAfter && end.nodeBefore ) && start.nodeAfter.parent === end.nodeBefore.parent;\n\n\t\tconst expandStart = isStartInLimit && ( !bothInSameParent || !isSelectable( start.nodeAfter, schema ) );\n\t\tconst expandEnd = isEndInLimit && ( !bothInSameParent || !isSelectable( end.nodeBefore, schema ) );\n\n\t\t// Although we've already found limit element on start/end positions we must find the outer-most limit element.\n\t\t// as limit elements might be nested directly inside (ie table > tableRow > tableCell).\n\t\tlet fixedStart = start;\n\t\tlet fixedEnd = end;\n\n\t\tif ( expandStart ) {\n\t\t\tfixedStart = Position._createBefore( findOutermostLimitAncestor( startLimitElement, schema ) );\n\t\t}\n\n\t\tif ( expandEnd ) {\n\t\t\tfixedEnd = Position._createAfter( findOutermostLimitAncestor( endLimitElement, schema ) );\n\t\t}\n\n\t\treturn new Range( fixedStart, fixedEnd );\n\t}\n\n\t// Range was not fixed at this point so it is valid - ie it was placed around limit element already.\n\treturn null;\n}\n\n// Finds the outer-most ancestor.\n//\n// @param {module:engine/model/node~Node} startingNode\n// @param {module:engine/model/schema~Schema} schema\n// @param {String} expandToDirection Direction of expansion - either 'start' or 'end' of the range.\n// @returns {module:engine/model/node~Node}\nfunction findOutermostLimitAncestor( startingNode, schema ) {\n\tlet isLimitNode = startingNode;\n\tlet parent = isLimitNode;\n\n\t// Find outer most isLimit block as such blocks might be nested (ie. in tables).\n\twhile ( schema.isLimit( parent ) && parent.parent ) {\n\t\tisLimitNode = parent;\n\t\tparent = parent.parent;\n\t}\n\n\treturn isLimitNode;\n}\n\n// Checks whether any of range boundaries is placed around non-limit elements.\n//\n// @param {module:engine/model/position~Position} start\n// @param {module:engine/model/position~Position} end\n// @param {module:engine/model/schema~Schema} schema\n// @returns {Boolean}\nfunction checkSelectionOnNonLimitElements( start, end, schema ) {\n\tconst startIsOnBlock = ( start.nodeAfter && !schema.isLimit( start.nodeAfter ) ) || schema.checkChild( start, '$text' );\n\tconst endIsOnBlock = ( end.nodeBefore && !schema.isLimit( end.nodeBefore ) ) || schema.checkChild( end, '$text' );\n\n\t// We should fix such selection when one of those nodes needs fixing.\n\treturn startIsOnBlock || endIsOnBlock;\n}\n\n// Returns a minimal non-intersecting array of ranges.\n//\n// @param {Array.<module:engine/model/range~Range>} ranges\n// @returns {Array.<module:engine/model/range~Range>}\nfunction mergeIntersectingRanges( ranges ) {\n\tconst nonIntersectingRanges = [];\n\n\t// First range will always be fine.\n\tnonIntersectingRanges.push( ranges.shift() );\n\n\tfor ( const range of ranges ) {\n\t\tconst previousRange = nonIntersectingRanges.pop();\n\n\t\tif ( range.isEqual( previousRange ) ) {\n\t\t\t// Use only one of two identical ranges.\n\t\t\tnonIntersectingRanges.push( previousRange );\n\t\t} else if ( range.isIntersecting( previousRange ) ) {\n\t\t\t// Get the sum of two ranges.\n\t\t\tconst start = previousRange.start.isAfter( range.start ) ? range.start : previousRange.start;\n\t\t\tconst end = previousRange.end.isAfter( range.end ) ? previousRange.end : range.end;\n\n\t\t\tconst merged = new Range( start, end );\n\t\t\tnonIntersectingRanges.push( merged );\n\t\t} else {\n\t\t\tnonIntersectingRanges.push( previousRange );\n\t\t\tnonIntersectingRanges.push( range );\n\t\t}\n\t}\n\n\treturn nonIntersectingRanges;\n}\n\n// Checks if node exists and if it's a selectable.\n//\n// @param {module:engine/model/node~Node} node\n// @param {module:engine/model/schema~Schema} schema\n// @returns {Boolean}\nfunction isSelectable( node, schema ) {\n\treturn node && schema.isSelectable( node );\n}\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module engine/model/model\n */\n\nimport Batch from './batch';\nimport Writer from './writer';\nimport Schema from './schema';\nimport Document from './document';\nimport MarkerCollection from './markercollection';\nimport ObservableMixin from '@ckeditor/ckeditor5-utils/src/observablemixin';\nimport mix from '@ckeditor/ckeditor5-utils/src/mix';\nimport ModelElement from './element';\nimport ModelRange from './range';\nimport ModelPosition from './position';\nimport ModelSelection from './selection';\nimport OperationFactory from './operation/operationfactory';\n\nimport insertContent from './utils/insertcontent';\nimport deleteContent from './utils/deletecontent';\nimport modifySelection from './utils/modifyselection';\nimport getSelectedContent from './utils/getselectedcontent';\nimport { injectSelectionPostFixer } from './utils/selection-post-fixer';\nimport { autoParagraphEmptyRoots } from './utils/autoparagraphing';\nimport CKEditorError from '@ckeditor/ckeditor5-utils/src/ckeditorerror';\n\n// @if CK_DEBUG_ENGINE // const { dumpTrees } = require( '../dev-utils/utils' );\n// @if CK_DEBUG_ENGINE // const { OperationReplayer } = require( '../dev-utils/operationreplayer' ).default;\n\n/**\n * Editor's data model. Read about the model in the\n * {@glink framework/guides/architecture/editing-engine engine architecture guide}.\n *\n * @mixes module:utils/observablemixin~ObservableMixin\n */\nexport default class Model {\n\tconstructor() {\n\t\t/**\n\t\t * Model's marker collection.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:engine/model/markercollection~MarkerCollection}\n\t\t */\n\t\tthis.markers = new MarkerCollection();\n\n\t\t/**\n\t\t * Model's document.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:engine/model/document~Document}\n\t\t */\n\t\tthis.document = new Document( this );\n\n\t\t/**\n\t\t * Model's schema.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:engine/model/schema~Schema}\n\t\t */\n\t\tthis.schema = new Schema();\n\n\t\t/**\n\t\t * All callbacks added by {@link module:engine/model/model~Model#change} or\n\t\t * {@link module:engine/model/model~Model#enqueueChange} methods waiting to be executed.\n\t\t *\n\t\t * @private\n\t\t * @type {Array.<Function>}\n\t\t */\n\t\tthis._pendingChanges = [];\n\n\t\t/**\n\t\t * The last created and currently used writer instance.\n\t\t *\n\t\t * @private\n\t\t * @member {module:engine/model/writer~Writer}\n\t\t */\n\t\tthis._currentWriter = null;\n\n\t\t[ 'insertContent', 'deleteContent', 'modifySelection', 'getSelectedContent', 'applyOperation' ]\n\t\t\t.forEach( methodName => this.decorate( methodName ) );\n\n\t\t// Adding operation validation with `highest` priority, so it is called before any other feature would like\n\t\t// to do anything with the operation. If the operation has incorrect parameters it should throw on the earliest occasion.\n\t\tthis.on( 'applyOperation', ( evt, args ) => {\n\t\t\tconst operation = args[ 0 ];\n\n\t\t\toperation._validate();\n\t\t}, { priority: 'highest' } );\n\n\t\t// Register some default abstract entities.\n\t\tthis.schema.register( '$root', {\n\t\t\tisLimit: true\n\t\t} );\n\t\tthis.schema.register( '$block', {\n\t\t\tallowIn: '$root',\n\t\t\tisBlock: true\n\t\t} );\n\t\tthis.schema.register( '$text', {\n\t\t\tallowIn: '$block',\n\t\t\tisInline: true,\n\t\t\tisContent: true\n\t\t} );\n\t\tthis.schema.register( '$clipboardHolder', {\n\t\t\tallowContentOf: '$root',\n\t\t\tisLimit: true\n\t\t} );\n\t\tthis.schema.extend( '$text', { allowIn: '$clipboardHolder' } );\n\n\t\t// An element needed by the `upcastElementToMarker` converter.\n\t\t// This element temporarily represents a marker boundary during the conversion process and is removed\n\t\t// at the end of the conversion. `UpcastDispatcher` or at least `Conversion` class looks like a\n\t\t// better place for this registration but both know nothing about `Schema`.\n\t\tthis.schema.register( '$marker' );\n\t\tthis.schema.addChildCheck( ( context, childDefinition ) => {\n\t\t\tif ( childDefinition.name === '$marker' ) {\n\t\t\t\treturn true;\n\t\t\t}\n\t\t} );\n\n\t\tinjectSelectionPostFixer( this );\n\n\t\t// Post-fixer which takes care of adding empty paragraph elements to the empty roots.\n\t\tthis.document.registerPostFixer( autoParagraphEmptyRoots );\n\n\t\t// @if CK_DEBUG_ENGINE // this.on( 'applyOperation', () => {\n\t\t// @if CK_DEBUG_ENGINE // \tdumpTrees( this.document, this.document.version );\n\t\t// @if CK_DEBUG_ENGINE // }, { priority: 'lowest' } );\n\t}\n\n\t/**\n\t * The `change()` method is the primary way of changing the model. You should use it to modify all document nodes\n\t * (including detached nodes – i.e. nodes not added to the {@link module:engine/model/model~Model#document model document}),\n\t * the {@link module:engine/model/document~Document#selection document's selection}, and\n\t * {@link module:engine/model/model~Model#markers model markers}.\n\t *\n\t *\t\tmodel.change( writer => {\n\t *\t\t\twriter.insertText( 'foo', paragraph, 'end' );\n\t *\t\t} );\n\t *\n\t * All changes inside the change block use the same {@link module:engine/model/batch~Batch} so they are combined\n\t * into a single undo step.\n\t *\n\t *\t\tmodel.change( writer => {\n\t *\t\t\twriter.insertText( 'foo', paragraph, 'end' ); // foo.\n\t *\n\t *\t\t\tmodel.change( writer => {\n\t *\t\t\t\twriter.insertText( 'bar', paragraph, 'end' ); // foobar.\n\t *\t\t\t} );\n\t *\n\t * \t\t\twriter.insertText( 'bom', paragraph, 'end' ); // foobarbom.\n\t *\t\t} );\n\t *\n\t * The callback of the `change()` block is executed synchronously.\n\t *\n\t * You can also return a value from the change block.\n\t *\n\t *\t\tconst img = model.change( writer => {\n\t *\t\t\treturn writer.createElement( 'img' );\n\t *\t\t} );\n\t *\n\t * @see #enqueueChange\n\t * @param {Function} callback Callback function which may modify the model.\n\t * @returns {*} Value returned by the callback.\n\t */\n\tchange( callback ) {\n\t\ttry {\n\t\t\tif ( this._pendingChanges.length === 0 ) {\n\t\t\t\t// If this is the outermost block, create a new batch and start `_runPendingChanges` execution flow.\n\t\t\t\tthis._pendingChanges.push( { batch: new Batch(), callback } );\n\n\t\t\t\treturn this._runPendingChanges()[ 0 ];\n\t\t\t} else {\n\t\t\t\t// If this is not the outermost block, just execute the callback.\n\t\t\t\treturn callback( this._currentWriter );\n\t\t\t}\n\t\t} catch ( err ) {\n\t\t\t// @if CK_DEBUG // throw err;\n\t\t\t/* istanbul ignore next */\n\t\t\tCKEditorError.rethrowUnexpectedError( err, this );\n\t\t}\n\t}\n\n\t/**\n\t * The `enqueueChange()` method performs similar task as the {@link #change `change()` method}, with two major differences.\n\t *\n\t * First, the callback of `enqueueChange()` is executed when all other enqueued changes are done. It might be executed\n\t * immediately if it is not nested in any other change block, but if it is nested in another (enqueue)change block,\n\t * it will be delayed and executed after the outermost block.\n\t *\n\t *\t\tmodel.change( writer => {\n\t *\t\t\tconsole.log( 1 );\n\t *\n\t *\t\t\tmodel.enqueueChange( writer => {\n\t *\t\t\t\tconsole.log( 2 );\n\t *\t\t\t} );\n\t *\n\t * \t\t\tconsole.log( 3 );\n\t *\t\t} ); // Will log: 1, 3, 2.\n\t *\n\t * In addition to that, the changes enqueued with `enqueueChange()` will be converted separately from the changes\n\t * done in the outer `change()` block.\n\t *\n\t * Second, it lets you define the {@link module:engine/model/batch~Batch} into which you want to add your changes.\n\t * By default, a new batch is created. In the sample above, `change` and `enqueueChange` blocks use a different\n\t * batch (and different {@link module:engine/model/writer~Writer} since each of them operates on the separate batch).\n\t *\n\t * When using the `enqueueChange()` block you can also add some changes to the batch you used before.\n\t *\n\t *\t\tmodel.enqueueChange( batch, writer => {\n\t *\t\t\twriter.insertText( 'foo', paragraph, 'end' );\n\t *\t\t} );\n\t *\n\t * In order to make a nested `enqueueChange()` create a single undo step together with the changes done in the outer `change()`\n\t * block, you can obtain the batch instance from the  {@link module:engine/model/writer~Writer#batch writer} of the outer block.\n\t *\n\t * @param {module:engine/model/batch~Batch|'transparent'|'default'} batchOrType Batch or batch type should be used in the callback.\n\t * If not defined, a new batch will be created.\n\t * @param {Function} callback Callback function which may modify the model.\n\t */\n\tenqueueChange( batchOrType, callback ) {\n\t\ttry {\n\t\t\tif ( typeof batchOrType === 'string' ) {\n\t\t\t\tbatchOrType = new Batch( batchOrType );\n\t\t\t} else if ( typeof batchOrType == 'function' ) {\n\t\t\t\tcallback = batchOrType;\n\t\t\t\tbatchOrType = new Batch();\n\t\t\t}\n\n\t\t\tthis._pendingChanges.push( { batch: batchOrType, callback } );\n\n\t\t\tif ( this._pendingChanges.length == 1 ) {\n\t\t\t\tthis._runPendingChanges();\n\t\t\t}\n\t\t} catch ( err ) {\n\t\t\t// @if CK_DEBUG // throw err;\n\t\t\t/* istanbul ignore next */\n\t\t\tCKEditorError.rethrowUnexpectedError( err, this );\n\t\t}\n\t}\n\n\t/**\n\t * {@link module:utils/observablemixin~ObservableMixin#decorate Decorated} function for applying\n\t * {@link module:engine/model/operation/operation~Operation operations} to the model.\n\t *\n\t * This is a low-level way of changing the model. It is exposed for very specific use cases (like the undo feature).\n\t * Normally, to modify the model, you will want to use {@link module:engine/model/writer~Writer `Writer`}.\n\t * See also {@glink framework/guides/architecture/editing-engine#changing-the-model Changing the model} section\n\t * of the {@glink framework/guides/architecture/editing-engine Editing architecture} guide.\n\t *\n\t * @param {module:engine/model/operation/operation~Operation} operation The operation to apply.\n\t */\n\tapplyOperation( operation ) {\n\t\t// @if CK_DEBUG_ENGINE // console.log( 'Applying ' + operation );\n\n\t\t// @if CK_DEBUG_ENGINE // if ( !this._operationLogs ) {\n\t\t// @if CK_DEBUG_ENGINE //\tthis._operationLogs = [];\n\t\t// @if CK_DEBUG_ENGINE // }\n\n\t\t// @if CK_DEBUG_ENGINE // this._operationLogs.push( JSON.stringify( operation ) );\n\n\t\t// @if CK_DEBUG_ENGINE //if ( !this._appliedOperations ) {\n\t\t// @if CK_DEBUG_ENGINE //\tthis._appliedOperations = [];\n\t\t// @if CK_DEBUG_ENGINE //}\n\n\t\t// @if CK_DEBUG_ENGINE //this._appliedOperations.push( operation );\n\n\t\toperation._execute();\n\t}\n\n\t// @if CK_DEBUG_ENGINE // getAppliedOperation() {\n\t// @if CK_DEBUG_ENGINE //\tif ( !this._appliedOperations ) {\n\t// @if CK_DEBUG_ENGINE //\t\treturn '';\n\t// @if CK_DEBUG_ENGINE //\t}\n\n\t// @if CK_DEBUG_ENGINE //\treturn this._appliedOperations.map( JSON.stringify ).join( '-------' );\n\t// @if CK_DEBUG_ENGINE // }\n\n\t// @if CK_DEBUG_ENGINE // createReplayer( stringifiedOperations ) {\n\t// @if CK_DEBUG_ENGINE //\treturn new OperationReplayer( this, '-------', stringifiedOperations );\n\t// @if CK_DEBUG_ENGINE // }\n\n\t/**\n\t * Inserts content at the position in the editor specified by the selection, as one would expect the paste\n\t * functionality to work.\n\t *\n\t * This is a high-level method. It takes the {@link #schema schema} into consideration when inserting\n\t * the content, clears the given selection's content before inserting nodes and moves the selection\n\t * to its target position at the end of the process.\n\t * It can split elements, merge them, wrap bare text nodes with paragraphs, etc. &mdash; just like the\n\t * pasting feature should do.\n\t *\n\t * For lower-level methods see {@link module:engine/model/writer~Writer `Writer`}.\n\t *\n\t * This method, unlike {@link module:engine/model/writer~Writer `Writer`}'s methods, does not have to be used\n\t * inside a {@link #change `change()` block}.\n\t *\n\t * # Conversion and schema\n\t *\n\t * Inserting elements and text nodes into the model is not enough to make CKEditor 5 render that content\n\t * to the user. CKEditor 5 implements a model-view-controller architecture and what `model.insertContent()` does\n\t * is only adding nodes to the model. Additionally, you need to define\n\t * {@glink framework/guides/architecture/editing-engine#conversion converters} between the model and view\n\t * and define those nodes in the {@glink framework/guides/architecture/editing-engine#schema schema}.\n\t *\n\t * So, while this method may seem similar to CKEditor 4 `editor.insertHtml()` (in fact, both methods\n\t * are used for paste-like content insertion), the CKEditor 5 method cannot be use to insert arbitrary HTML\n\t * unless converters are defined for all elements and attributes in that HTML.\n\t *\n\t * # Examples\n\t *\n\t * Using `insertContent()` with a manually created model structure:\n\t *\n\t *\t\t// Let's create a document fragment containing such content as:\n\t *\t\t//\n\t *\t\t// <paragraph>foo</paragraph>\n\t *\t\t// <blockQuote>\n\t *\t\t//    <paragraph>bar</paragraph>\n\t *\t\t// </blockQuote>\n\t *\t\tconst docFrag = editor.model.change( writer => {\n\t *\t\t\tconst p1 = writer.createElement( 'paragraph' );\n\t *\t\t\tconst p2 = writer.createElement( 'paragraph' );\n\t *\t\t\tconst blockQuote = writer.createElement( 'blockQuote' );\n\t *\t\t\tconst docFrag = writer.createDocumentFragment();\n\t *\n\t *\t\t\twriter.append( p1, docFrag );\n\t *\t\t\twriter.append( blockQuote, docFrag );\n\t *\t\t\twriter.append( p2, blockQuote );\n\t *\t\t\twriter.insertText( 'foo', p1 );\n\t *\t\t\twriter.insertText( 'bar', p2 );\n\t *\n\t *\t\t\treturn docFrag;\n\t *\t\t} );\n\t *\n\t *\t\t// insertContent() does not have to be used in a change() block. It can, though,\n\t *\t\t// so this code could be moved to the callback defined above.\n\t *\t\teditor.model.insertContent( docFrag );\n\t *\n\t * Using `insertContent()` with an HTML string converted to a model document fragment (similar to the pasting mechanism):\n\t *\n\t *\t\t// You can create your own HtmlDataProcessor instance or use editor.data.processor\n\t *\t\t// if you have not overridden the default one (which is the HtmlDataProcessor instance).\n\t *\t\tconst htmlDP = new HtmlDataProcessor( viewDocument );\n\t *\n\t *\t\t// Convert an HTML string to a view document fragment:\n\t *\t\tconst viewFragment = htmlDP.toView( htmlString );\n\t *\n\t *\t\t// Convert the view document fragment to a model document fragment\n\t *\t\t// in the context of $root. This conversion takes the schema into\n\t *\t\t// account so if, for example, the view document fragment contained a bare text node,\n\t *\t\t// this text node cannot be a child of $root, so it will be automatically\n\t *\t\t// wrapped with a <paragraph>. You can define the context yourself (in the second parameter),\n\t *\t\t// and e.g. convert the content like it would happen in a <paragraph>.\n\t *\t\t// Note: The clipboard feature uses a custom context called $clipboardHolder\n\t *\t\t// which has a loosened schema.\n\t *\t\tconst modelFragment = editor.data.toModel( viewFragment );\n\t *\n\t *\t\teditor.model.insertContent( modelFragment );\n\t *\n\t * By default this method will use the document selection but it can also be used with a position, range or selection instance.\n\t *\n\t *\t\t// Insert text at the current document selection position.\n\t *\t\teditor.model.change( writer => {\n\t *\t\t\teditor.model.insertContent( writer.createText( 'x' ) );\n\t *\t\t} );\n\t *\n\t *\t\t// Insert text at a given position - the document selection will not be modified.\n\t *\t\teditor.model.change( writer => {\n\t *\t\t\teditor.model.insertContent( writer.createText( 'x' ), doc.getRoot(), 2 );\n\t *\n\t *\t\t\t// Which is a shorthand for:\n\t *\t\t\teditor.model.insertContent( writer.createText( 'x' ), writer.createPositionAt( doc.getRoot(), 2 ) );\n\t *\t\t} );\n\t *\n\t * If you want the document selection to be moved to the inserted content, use the\n\t * {@link module:engine/model/writer~Writer#setSelection `setSelection()`} method of the writer after inserting\n\t * the content:\n\t *\n\t *\t\teditor.model.change( writer => {\n\t *\t\t\tconst paragraph = writer.createElement( 'paragraph' );\n\t *\n\t *\t\t\t// Insert an empty paragraph at the beginning of the root.\n\t *\t\t\teditor.model.insertContent( paragraph, writer.createPositionAt( editor.model.document.getRoot(), 0 ) );\n\t *\n\t *\t\t\t// Move the document selection to the inserted paragraph.\n\t *\t\t\twriter.setSelection( paragraph, 'in' );\n\t *\t\t} );\n\t *\n\t * If an instance of the {@link module:engine/model/selection~Selection model selection} is passed as `selectable`,\n\t * the new content will be inserted at the passed selection (instead of document selection):\n\t *\n\t *\t\teditor.model.change( writer => {\n\t *\t\t\t// Create a selection in a paragraph that will be used as a place of insertion.\n\t *\t\t\tconst selection = writer.createSelection( paragraph, 'in' );\n\t *\n\t *\t\t\t// Insert the new text at the created selection.\n\t *\t\t\teditor.model.insertContent( writer.createText( 'x' ), selection );\n\t *\n\t *\t\t\t// insertContent() modifies the passed selection instance so it can be used to set the document selection.\n\t *\t\t\t// Note: This is not necessary when you passed the document selection to insertContent().\n\t *\t\t\twriter.setSelection( selection );\n\t *\t\t} );\n\t *\n\t * @fires insertContent\n\t * @param {module:engine/model/documentfragment~DocumentFragment|module:engine/model/item~Item} content The content to insert.\n\t * @param {module:engine/model/selection~Selectable} [selectable=model.document.selection]\n\t * The selection into which the content should be inserted. If not provided the current model document selection will be used.\n\t * @param {Number|'before'|'end'|'after'|'on'|'in'} [placeOrOffset] To be used when a model item was passed as `selectable`.\n\t * This param defines a position in relation to that item.\n\t * @returns {module:engine/model/range~Range} Range which contains all the performed changes. This is a range that, if removed,\n\t * would return the model to the state before the insertion. If no changes were preformed by `insertContent`, returns a range collapsed\n\t * at the insertion position.\n\t */\n\tinsertContent( content, selectable, placeOrOffset ) {\n\t\treturn insertContent( this, content, selectable, placeOrOffset );\n\t}\n\n\t/**\n\t * Deletes content of the selection and merge siblings. The resulting selection is always collapsed.\n\t *\n\t * **Note:** For the sake of predictability, the resulting selection should always be collapsed.\n\t * In cases where a feature wants to modify deleting behavior so selection isn't collapsed\n\t * (e.g. a table feature may want to keep row selection after pressing <kbd>Backspace</kbd>),\n\t * then that behavior should be implemented in the view's listener. At the same time, the table feature\n\t * will need to modify this method's behavior too, e.g. to \"delete contents and then collapse\n\t * the selection inside the last selected cell\" or \"delete the row and collapse selection somewhere near\".\n\t * That needs to be done in order to ensure that other features which use `deleteContent()` will work well with tables.\n\t *\n\t * @fires deleteContent\n\t * @param {module:engine/model/selection~Selection|module:engine/model/documentselection~DocumentSelection} selection\n\t * Selection of which the content should be deleted.\n\t * @param {Object} [options]\n\t * @param {Boolean} [options.leaveUnmerged=false] Whether to merge elements after removing the content of the selection.\n\t *\n\t * For example `<heading1>x[x</heading1><paragraph>y]y</paragraph>` will become:\n\t *\n\t * * `<heading1>x^y</heading1>` with the option disabled (`leaveUnmerged == false`)\n\t * * `<heading1>x^</heading1><paragraph>y</paragraph>` with enabled (`leaveUnmerged == true`).\n\t *\n\t * Note: {@link module:engine/model/schema~Schema#isObject object} and {@link module:engine/model/schema~Schema#isLimit limit}\n\t * elements will not be merged.\n\t *\n\t * @param {Boolean} [options.doNotResetEntireContent=false] Whether to skip replacing the entire content with a\n\t * paragraph when the entire content was selected.\n\t *\n\t * For example `<heading1>[x</heading1><paragraph>y]</paragraph>` will become:\n\t *\n\t * * `<paragraph>^</paragraph>` with the option disabled (`doNotResetEntireContent == false`)\n\t * * `<heading1>^</heading1>` with enabled (`doNotResetEntireContent == true`)\n\t *\n\t * @param {Boolean} [options.doNotAutoparagraph=false] Whether to create a paragraph if after content deletion selection is moved\n\t * to a place where text cannot be inserted.\n\t *\n\t * For example `<paragraph>x</paragraph>[<image src=\"foo.jpg\"></image>]` will become:\n\t *\n\t * * `<paragraph>x</paragraph><paragraph>[]</paragraph>` with the option disabled (`doNotAutoparagraph == false`)\n\t * * `<paragraph>x[]</paragraph>` with the option enabled (`doNotAutoparagraph == true`).\n\t *\n\t * **Note:** if there is no valid position for the selection, the paragraph will always be created:\n\t *\n\t * `[<image src=\"foo.jpg\"></image>]` -> `<paragraph>[]</paragraph>`.\n\t *\n\t * @param {'forward'|'backward'} [options.direction='backward'] The direction in which the content is being consumed.\n\t * Deleting backward corresponds to using the <kbd>Backspace</kbd> key, while deleting content forward corresponds to\n\t * the <kbd>Shift</kbd>+<kbd>Backspace</kbd> keystroke.\n\t */\n\tdeleteContent( selection, options ) {\n\t\tdeleteContent( this, selection, options );\n\t}\n\n\t/**\n\t * Modifies the selection. Currently, the supported modifications are:\n\t *\n\t * * Extending. The selection focus is moved in the specified `options.direction` with a step specified in `options.unit`.\n\t * Possible values for `unit` are:\n\t *  * `'character'` (default) - moves selection by one user-perceived character. In most cases this means moving by one\n\t *  character in `String` sense. However, unicode also defines \"combing marks\". These are special symbols, that combines\n\t *  with a symbol before it (\"base character\") to create one user-perceived character. For example, `q̣̇` is a normal\n\t *  letter `q` with two \"combining marks\": upper dot (`Ux0307`) and lower dot (`Ux0323`). For most actions, i.e. extending\n\t *  selection by one position, it is correct to include both \"base character\" and all of it's \"combining marks\". That is\n\t *  why `'character'` value is most natural and common method of modifying selection.\n\t *  * `'codePoint'` - moves selection by one unicode code point. In contrary to, `'character'` unit, this will insert\n\t *  selection between \"base character\" and \"combining mark\", because \"combining marks\" have their own unicode code points.\n\t *  However, for technical reasons, unicode code points with values above `UxFFFF` are represented in native `String` by\n\t *  two characters, called \"surrogate pairs\". Halves of \"surrogate pairs\" have a meaning only when placed next to each other.\n\t *  For example `𨭎` is represented in `String` by `\\uD862\\uDF4E`. Both `\\uD862` and `\\uDF4E` do not have any meaning\n\t *  outside the pair (are rendered as ? when alone). Position between them would be incorrect. In this case, selection\n\t *  extension will include whole \"surrogate pair\".\n\t *  * `'word'` - moves selection by a whole word.\n\t *\n\t * **Note:** if you extend a forward selection in a backward direction you will in fact shrink it.\n\t *\n\t * @fires modifySelection\n\t * @param {module:engine/model/selection~Selection|module:engine/model/documentselection~DocumentSelection} selection\n\t * The selection to modify.\n\t * @param {Object} [options]\n\t * @param {'forward'|'backward'} [options.direction='forward'] The direction in which the selection should be modified.\n\t * @param {'character'|'codePoint'|'word'} [options.unit='character'] The unit by which selection should be modified.\n\t */\n\tmodifySelection( selection, options ) {\n\t\tmodifySelection( this, selection, options );\n\t}\n\n\t/**\n\t * Gets a clone of the selected content.\n\t *\n\t * For example, for the following selection:\n\t *\n\t * ```html\n\t * <paragraph>x</paragraph>\n\t * <blockQuote>\n\t *\t<paragraph>y</paragraph>\n\t *\t<heading1>fir[st</heading1>\n\t * </blockQuote>\n\t * <paragraph>se]cond</paragraph>\n\t * <paragraph>z</paragraph>\n\t * ```\n\t *\n\t * It will return a document fragment with such a content:\n\t *\n\t * ```html\n\t * <blockQuote>\n\t *\t<heading1>st</heading1>\n\t * </blockQuote>\n\t * <paragraph>se</paragraph>\n\t * ```\n\t *\n\t * @fires getSelectedContent\n\t * @param {module:engine/model/selection~Selection|module:engine/model/documentselection~DocumentSelection} selection\n\t * The selection of which content will be returned.\n\t * @returns {module:engine/model/documentfragment~DocumentFragment}\n\t */\n\tgetSelectedContent( selection ) {\n\t\treturn getSelectedContent( this, selection );\n\t}\n\n\t/**\n\t * Checks whether the given {@link module:engine/model/range~Range range} or\n\t * {@link module:engine/model/element~Element element} has any meaningful content.\n\t *\n\t * Meaningful content is:\n\t *\n\t * * any text node (`options.ignoreWhitespaces` allows controlling whether this text node must also contain\n\t * any non-whitespace characters),\n\t * * or any {@link module:engine/model/schema~Schema#isContent content element},\n\t * * or any {@link module:engine/model/markercollection~Marker marker} which\n\t * {@link module:engine/model/markercollection~Marker#_affectsData affects data}.\n\t *\n\t * This means that a range containing an empty `<paragraph></paragraph>` is not considered to have a meaningful content.\n\t * However, a range containing an `<image></image>` (which would normally be marked in the schema as an object element)\n\t * is considered non-empty.\n\t *\n\t * @param {module:engine/model/range~Range|module:engine/model/element~Element} rangeOrElement Range or element to check.\n\t * @param {Object} [options]\n\t * @param {Boolean} [options.ignoreWhitespaces] Whether text node with whitespaces only should be considered empty.\n\t * @param {Boolean} [options.ignoreMarkers] Whether markers should be ignored.\n\t * @returns {Boolean}\n\t */\n\thasContent( rangeOrElement, options = {} ) {\n\t\tconst range = rangeOrElement instanceof ModelElement ? ModelRange._createIn( rangeOrElement ) : rangeOrElement;\n\n\t\tif ( range.isCollapsed ) {\n\t\t\treturn false;\n\t\t}\n\n\t\tconst { ignoreWhitespaces = false, ignoreMarkers = false } = options;\n\n\t\t// Check if there are any markers which affects data in this given range.\n\t\tif ( !ignoreMarkers ) {\n\t\t\tfor ( const intersectingMarker of this.markers.getMarkersIntersectingRange( range ) ) {\n\t\t\t\tif ( intersectingMarker.affectsData ) {\n\t\t\t\t\treturn true;\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\n\t\tfor ( const item of range.getItems() ) {\n\t\t\tif ( this.schema.isContent( item ) ) {\n\t\t\t\tif ( item.is( '$textProxy' ) ) {\n\t\t\t\t\tif ( !ignoreWhitespaces ) {\n\t\t\t\t\t\treturn true;\n\t\t\t\t\t} else if ( item.data.search( /\\S/ ) !== -1 ) {\n\t\t\t\t\t\treturn true;\n\t\t\t\t\t}\n\t\t\t\t} else {\n\t\t\t\t\treturn true;\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\n\t\treturn false;\n\t}\n\n\t/**\n\t * Creates a position from the given root and path in that root.\n\t *\n\t * Note: This method is also available as\n\t * {@link module:engine/model/writer~Writer#createPositionFromPath `Writer#createPositionFromPath()`}.\n\t *\n\t * @param {module:engine/model/element~Element|module:engine/model/documentfragment~DocumentFragment} root Root of the position.\n\t * @param {Array.<Number>} path Position path. See {@link module:engine/model/position~Position#path}.\n\t * @param {module:engine/model/position~PositionStickiness} [stickiness='toNone'] Position stickiness.\n\t * See {@link module:engine/model/position~PositionStickiness}.\n\t * @returns {module:engine/model/position~Position}\n\t */\n\tcreatePositionFromPath( root, path, stickiness ) {\n\t\treturn new ModelPosition( root, path, stickiness );\n\t}\n\n\t/**\n\t * Creates position at the given location. The location can be specified as:\n\t *\n\t * * a {@link module:engine/model/position~Position position},\n\t * * a parent element and offset in that element,\n\t * * a parent element and `'end'` (the position will be set at the end of that element),\n\t * * a {@link module:engine/model/item~Item model item} and `'before'` or `'after'`\n\t * (the position will be set before or after the given model item).\n\t *\n\t * This method is a shortcut to other factory methods such as:\n\t *\n\t * * {@link module:engine/model/model~Model#createPositionBefore `createPositionBefore()`},\n\t * * {@link module:engine/model/model~Model#createPositionAfter `createPositionAfter()`}.\n\t *\n\t * Note: This method is also available as\n\t * {@link module:engine/model/writer~Writer#createPositionAt `Writer#createPositionAt()`},\n\t *\n\t * @param {module:engine/model/item~Item|module:engine/model/position~Position} itemOrPosition\n\t * @param {Number|'end'|'before'|'after'} [offset] Offset or one of the flags. Used only when\n\t * first parameter is a {@link module:engine/model/item~Item model item}.\n\t */\n\tcreatePositionAt( itemOrPosition, offset ) {\n\t\treturn ModelPosition._createAt( itemOrPosition, offset );\n\t}\n\n\t/**\n\t * Creates a new position after the given {@link module:engine/model/item~Item model item}.\n\t *\n\t * Note: This method is also available as\n\t * {@link module:engine/model/writer~Writer#createPositionAfter `Writer#createPositionAfter()`}.\n\t *\n\t * @param {module:engine/model/item~Item} item Item after which the position should be placed.\n\t * @returns {module:engine/model/position~Position}\n\t */\n\tcreatePositionAfter( item ) {\n\t\treturn ModelPosition._createAfter( item );\n\t}\n\n\t/**\n\t * Creates a new position before the given {@link module:engine/model/item~Item model item}.\n\t *\n\t * Note: This method is also available as\n\t * {@link module:engine/model/writer~Writer#createPositionBefore `Writer#createPositionBefore()`}.\n\t *\n\t * @param {module:engine/model/item~Item} item Item before which the position should be placed.\n\t * @returns {module:engine/model/position~Position}\n\t */\n\tcreatePositionBefore( item ) {\n\t\treturn ModelPosition._createBefore( item );\n\t}\n\n\t/**\n\t * Creates a range spanning from the `start` position to the `end` position.\n\t *\n\t * Note: This method is also available as\n\t * {@link module:engine/model/writer~Writer#createRange `Writer#createRange()`}:\n\t *\n\t *\t\tmodel.change( writer => {\n\t *\t\t\tconst range = writer.createRange( start, end );\n\t *\t\t} );\n\t *\n\t * @param {module:engine/model/position~Position} start Start position.\n\t * @param {module:engine/model/position~Position} [end] End position. If not set, the range will be collapsed\n\t * to the `start` position.\n\t * @returns {module:engine/model/range~Range}\n\t */\n\tcreateRange( start, end ) {\n\t\treturn new ModelRange( start, end );\n\t}\n\n\t/**\n\t * Creates a range inside the given element which starts before the first child of\n\t * that element and ends after the last child of that element.\n\t *\n\t * Note: This method is also available as\n\t * {@link module:engine/model/writer~Writer#createRangeIn `Writer#createRangeIn()`}:\n\t *\n\t *\t\tmodel.change( writer => {\n\t *\t\t\tconst range = writer.createRangeIn( paragraph );\n\t *\t\t} );\n\t *\n\t * @param {module:engine/model/element~Element} element Element which is a parent for the range.\n\t * @returns {module:engine/model/range~Range}\n\t */\n\tcreateRangeIn( element ) {\n\t\treturn ModelRange._createIn( element );\n\t}\n\n\t/**\n\t * Creates a range that starts before the given {@link module:engine/model/item~Item model item} and ends after it.\n\t *\n\t * Note: This method is also available on `writer` instance as\n\t * {@link module:engine/model/writer~Writer#createRangeOn `Writer.createRangeOn()`}:\n\t *\n\t *\t\tmodel.change( writer => {\n\t *\t\t\tconst range = writer.createRangeOn( paragraph );\n\t *\t\t} );\n\t *\n\t * @param {module:engine/model/item~Item} item\n\t * @returns {module:engine/model/range~Range}\n\t */\n\tcreateRangeOn( item ) {\n\t\treturn ModelRange._createOn( item );\n\t}\n\n\t/**\n\t * Creates a new selection instance based on the given {@link module:engine/model/selection~Selectable selectable}\n\t * or creates an empty selection if no arguments were passed.\n\t *\n\t * Note: This method is also available as\n\t * {@link module:engine/model/writer~Writer#createSelection `Writer#createSelection()`}.\n\t *\n\t *\t\t// Creates empty selection without ranges.\n\t *\t\tconst selection = writer.createSelection();\n\t *\n\t *\t\t// Creates selection at the given range.\n\t *\t\tconst range = writer.createRange( start, end );\n\t *\t\tconst selection = writer.createSelection( range );\n\t *\n\t *\t\t// Creates selection at the given ranges\n\t *\t\tconst ranges = [ writer.createRange( start1, end2 ), writer.createRange( star2, end2 ) ];\n\t *\t\tconst selection = writer.createSelection( ranges );\n\t *\n\t *\t\t// Creates selection from the other selection.\n\t *\t\t// Note: It doesn't copies selection attributes.\n\t *\t\tconst otherSelection = writer.createSelection();\n\t *\t\tconst selection = writer.createSelection( otherSelection );\n\t *\n\t *\t\t// Creates selection from the given document selection.\n\t *\t\t// Note: It doesn't copies selection attributes.\n\t *\t\tconst documentSelection = model.document.selection;\n\t *\t\tconst selection = writer.createSelection( documentSelection );\n\t *\n\t *\t\t// Creates selection at the given position.\n\t *\t\tconst position = writer.createPositionFromPath( root, path );\n\t *\t\tconst selection = writer.createSelection( position );\n\t *\n\t *\t\t// Creates selection at the given offset in the given element.\n\t *\t\tconst paragraph = writer.createElement( 'paragraph' );\n\t *\t\tconst selection = writer.createSelection( paragraph, offset );\n\t *\n\t *\t\t// Creates a range inside an {@link module:engine/model/element~Element element} which starts before the\n\t *\t\t// first child of that element and ends after the last child of that element.\n\t *\t\tconst selection = writer.createSelection( paragraph, 'in' );\n\t *\n\t *\t\t// Creates a range on an {@link module:engine/model/item~Item item} which starts before the item and ends\n\t *\t\t// just after the item.\n\t *\t\tconst selection = writer.createSelection( paragraph, 'on' );\n\t *\n\t *\t\t// Additional options (`'backward'`) can be specified as the last argument.\n\t *\n\t *\t\t// Creates backward selection.\n\t *\t\tconst selection = writer.createSelection( range, { backward: true } );\n\t *\n\t * @param {module:engine/model/selection~Selectable} selectable\n\t * @param {Number|'before'|'end'|'after'|'on'|'in'} [placeOrOffset] Sets place or offset of the selection.\n\t * @param {Object} [options]\n\t * @param {Boolean} [options.backward] Sets this selection instance to be backward.\n\t * @returns {module:engine/model/selection~Selection}\n\t */\n\tcreateSelection( selectable, placeOrOffset, options ) {\n\t\treturn new ModelSelection( selectable, placeOrOffset, options );\n\t}\n\n\t/**\n\t * Creates a {@link module:engine/model/batch~Batch} instance.\n\t *\n\t * **Note:** In most cases creating a batch instance is not necessary as they are created when using:\n\t *\n\t * * {@link #change `change()`},\n\t * * {@link #enqueueChange `enqueueChange()`}.\n\t *\n\t * @param {'transparent'|'default'} [type='default'] The type of the batch.\n\t * @returns {module:engine/model/batch~Batch}\n\t */\n\tcreateBatch( type ) {\n\t\treturn new Batch( type );\n\t}\n\n\t/**\n\t * Creates an operation instance from a JSON object (parsed JSON string).\n\t *\n\t * This is an alias for {@link module:engine/model/operation/operationfactory~OperationFactory.fromJSON `OperationFactory.fromJSON()`}.\n\t *\n\t * @param {Object} json Deserialized JSON object.\n\t * @returns {module:engine/model/operation/operation~Operation}\n\t */\n\tcreateOperationFromJSON( json ) {\n\t\treturn OperationFactory.fromJSON( json, this.document );\n\t}\n\n\t/**\n\t * Removes all events listeners set by model instance and destroys {@link module:engine/model/document~Document}.\n\t */\n\tdestroy() {\n\t\tthis.document.destroy();\n\t\tthis.stopListening();\n\t}\n\n\t/**\n\t * Common part of {@link module:engine/model/model~Model#change} and {@link module:engine/model/model~Model#enqueueChange}\n\t * which calls callbacks and returns array of values returned by these callbacks.\n\t *\n\t * @private\n\t * @returns {Array.<*>} Array of values returned by callbacks.\n\t */\n\t_runPendingChanges() {\n\t\tconst ret = [];\n\n\t\tthis.fire( '_beforeChanges' );\n\n\t\twhile ( this._pendingChanges.length ) {\n\t\t\t// Create a new writer using batch instance created for this chain of changes.\n\t\t\tconst currentBatch = this._pendingChanges[ 0 ].batch;\n\t\t\tthis._currentWriter = new Writer( this, currentBatch );\n\n\t\t\t// Execute changes callback and gather the returned value.\n\t\t\tconst callbackReturnValue = this._pendingChanges[ 0 ].callback( this._currentWriter );\n\t\t\tret.push( callbackReturnValue );\n\n\t\t\tthis.document._handleChangeBlock( this._currentWriter );\n\n\t\t\tthis._pendingChanges.shift();\n\t\t\tthis._currentWriter = null;\n\t\t}\n\n\t\tthis.fire( '_afterChanges' );\n\n\t\treturn ret;\n\t}\n\n\t/**\n\t * Fired when entering the outermost {@link module:engine/model/model~Model#enqueueChange} or\n\t * {@link module:engine/model/model~Model#change} block.\n\t *\n\t * @protected\n\t * @event _beforeChanges\n\t */\n\n\t/**\n\t * Fired when leaving the outermost {@link module:engine/model/model~Model#enqueueChange} or\n\t * {@link module:engine/model/model~Model#change} block.\n\t *\n\t * @protected\n\t * @event _afterChanges\n\t */\n\n\t/**\n\t * Fired every time any {@link module:engine/model/operation/operation~Operation operation} is applied on the model\n\t * using {@link #applyOperation}.\n\t *\n\t * Note that this event is suitable only for very specific use-cases. Use it if you need to listen to every single operation\n\t * applied on the document. However, in most cases {@link module:engine/model/document~Document#event:change} should\n\t * be used.\n\t *\n\t * A few callbacks are already added to this event by engine internal classes:\n\t *\n\t * * with `highest` priority operation is validated,\n\t * * with `normal` priority operation is executed,\n\t * * with `low` priority the {@link module:engine/model/document~Document} updates its version,\n\t * * with `low` priority {@link module:engine/model/liveposition~LivePosition} and {@link module:engine/model/liverange~LiveRange}\n\t * update themselves.\n\t *\n\t * @event applyOperation\n\t * @param {Array} args Arguments of the `applyOperation` which is an array with a single element - applied\n\t * {@link module:engine/model/operation/operation~Operation operation}.\n\t */\n\n\t/**\n\t * Event fired when {@link #insertContent} method is called.\n\t *\n\t * The {@link #insertContent default action of that method} is implemented as a\n\t * listener to this event so it can be fully customized by the features.\n\t *\n\t * **Note** The `selectable` parameter for the {@link #insertContent} is optional. When `undefined` value is passed the method uses\n\t * `model.document.selection`.\n\t *\n\t * @event insertContent\n\t * @param {Array} args The arguments passed to the original method.\n\t */\n\n\t/**\n\t * Event fired when {@link #deleteContent} method is called.\n\t *\n\t * The {@link #deleteContent default action of that method} is implemented as a\n\t * listener to this event so it can be fully customized by the features.\n\t *\n\t * @event deleteContent\n\t * @param {Array} args The arguments passed to the original method.\n\t */\n\n\t/**\n\t * Event fired when {@link #modifySelection} method is called.\n\t *\n\t * The {@link #modifySelection default action of that method} is implemented as a\n\t * listener to this event so it can be fully customized by the features.\n\t *\n\t * @event modifySelection\n\t * @param {Array} args The arguments passed to the original method.\n\t */\n\n\t/**\n\t * Event fired when {@link #getSelectedContent} method is called.\n\t *\n\t * The {@link #getSelectedContent default action of that method} is implemented as a\n\t * listener to this event so it can be fully customized by the features.\n\t *\n\t * @event getSelectedContent\n\t * @param {Array} args The arguments passed to the original method.\n\t */\n}\n\nmix( Model, ObservableMixin );\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module utils/keystrokehandler\n */\n\nimport DomEmitterMixin from './dom/emittermixin';\nimport { getCode, parseKeystroke } from './keyboard';\n\n/**\n * Keystroke handler allows registering callbacks for given keystrokes.\n *\n * The most frequent use of this class is through the {@link module:core/editor/editor~Editor#keystrokes `editor.keystrokes`}\n * property. It allows listening to keystrokes executed in the editing view:\n *\n *\t\teditor.keystrokes.set( 'Ctrl+A', ( keyEvtData, cancel ) => {\n *\t\t\tconsole.log( 'Ctrl+A has been pressed' );\n *\t\t\tcancel();\n *\t\t} );\n *\n * However, this utility class can be used in various part of the UI. For instance, a certain {@link module:ui/view~View}\n * can use it like this:\n *\n *\t\tclass MyView extends View {\n *\t\t\tconstructor() {\n *\t\t\t\tthis.keystrokes = new KeystrokeHandler();\n *\n * \t\t\t\tthis.keystrokes.set( 'tab', handleTabKey );\n *\t\t\t}\n *\n *\t\t\trender() {\n *\t\t\t\tsuper.render();\n *\n *\t\t\t\tthis.keystrokes.listenTo( this.element );\n *\t\t\t}\n *\t\t}\n *\n * That keystroke handler will listen to `keydown` events fired in this view's main element.\n *\n */\nexport default class KeystrokeHandler {\n\t/**\n\t * Creates an instance of the keystroke handler.\n\t */\n\tconstructor() {\n\t\t/**\n\t\t * Listener used to listen to events for easier keystroke handler destruction.\n\t\t *\n\t\t * @protected\n\t\t * @member {module:utils/dom/emittermixin~Emitter}\n\t\t */\n\t\tthis._listener = Object.create( DomEmitterMixin );\n\t}\n\n\t/**\n\t * Starts listening for `keydown` events from a given emitter.\n\t *\n\t * @param {module:utils/emittermixin~Emitter} emitter\n\t */\n\tlistenTo( emitter ) {\n\t\t// The #_listener works here as a kind of dispatcher. It groups the events coming from the same\n\t\t// keystroke so the listeners can be attached to them with different priorities.\n\t\t//\n\t\t// E.g. all the keystrokes with the `keyCode` of 42 coming from the `emitter` are propagated\n\t\t// as a `_keydown:42` event by the `_listener`. If there's a callback created by the `set`\n\t\t// method for this 42 keystroke, it listens to the `_listener#_keydown:42` event only and interacts\n\t\t// only with other listeners of this particular event, thus making it possible to prioritize\n\t\t// the listeners and safely cancel execution, when needed. Instead of duplicating the Emitter logic,\n\t\t// the KeystrokeHandler re–uses it to do its job.\n\t\tthis._listener.listenTo( emitter, 'keydown', ( evt, keyEvtData ) => {\n\t\t\tthis._listener.fire( '_keydown:' + getCode( keyEvtData ), keyEvtData );\n\t\t} );\n\t}\n\n\t/**\n\t * Registers a handler for the specified keystroke.\n\t *\n\t * @param {String|Array.<String|Number>} keystroke Keystroke defined in a format accepted by\n\t * the {@link module:utils/keyboard~parseKeystroke} function.\n\t * @param {Function} callback A function called with the\n\t * {@link module:engine/view/observer/keyobserver~KeyEventData key event data} object and\n\t * a helper funcion to call both `preventDefault()` and `stopPropagation()` on the underlying event.\n\t * @param {Object} [options={}] Additional options.\n\t * @param {module:utils/priorities~PriorityString|Number} [options.priority='normal'] The priority of the keystroke\n\t * callback. The higher the priority value the sooner the callback will be executed. Keystrokes having the same priority\n\t * are called in the order they were added.\n\t */\n\tset( keystroke, callback, options = {} ) {\n\t\tconst keyCode = parseKeystroke( keystroke );\n\t\tconst priority = options.priority;\n\n\t\t// Execute the passed callback on KeystrokeHandler#_keydown.\n\t\t// TODO: https://github.com/ckeditor/ckeditor5-utils/issues/144\n\t\tthis._listener.listenTo( this._listener, '_keydown:' + keyCode, ( evt, keyEvtData ) => {\n\t\t\tcallback( keyEvtData, () => {\n\t\t\t\t// Stop the event in the DOM: no listener in the web page\n\t\t\t\t// will be triggered by this event.\n\t\t\t\tkeyEvtData.preventDefault();\n\t\t\t\tkeyEvtData.stopPropagation();\n\n\t\t\t\t// Stop the event in the KeystrokeHandler: no more callbacks\n\t\t\t\t// will be executed for this keystroke.\n\t\t\t\tevt.stop();\n\t\t\t} );\n\n\t\t\t// Mark this keystroke as handled by the callback. See: #press.\n\t\t\tevt.return = true;\n\t\t}, { priority } );\n\t}\n\n\t/**\n\t * Triggers a keystroke handler for a specified key combination, if such a keystroke was {@link #set defined}.\n\t *\n\t * @param {module:engine/view/observer/keyobserver~KeyEventData} keyEvtData Key event data.\n\t * @returns {Boolean} Whether the keystroke was handled.\n\t */\n\tpress( keyEvtData ) {\n\t\treturn !!this._listener.fire( '_keydown:' + getCode( keyEvtData ), keyEvtData );\n\t}\n\n\t/**\n\t * Destroys the keystroke handler.\n\t */\n\tdestroy() {\n\t\tthis._listener.stopListening();\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module core/editingkeystrokehandler\n */\n\nimport KeystrokeHandler from '@ckeditor/ckeditor5-utils/src/keystrokehandler';\n\n/**\n * A keystroke handler for editor editing. Its instance is available\n * in {@link module:core/editor/editor~Editor#keystrokes} so plugins\n * can register their keystrokes.\n *\n * E.g. an undo plugin would do this:\n *\n *\t\teditor.keystrokes.set( 'Ctrl+Z', 'undo' );\n *\t\teditor.keystrokes.set( 'Ctrl+Shift+Z', 'redo' );\n *\t\teditor.keystrokes.set( 'Ctrl+Y', 'redo' );\n *\n * @extends module:utils/keystrokehandler~KeystrokeHandler\n */\nexport default class EditingKeystrokeHandler extends KeystrokeHandler {\n\t/**\n\t * Creates an instance of the keystroke handler.\n\t *\n\t * @param {module:core/editor/editor~Editor} editor\n\t */\n\tconstructor( editor ) {\n\t\tsuper();\n\n\t\t/**\n\t\t * The editor instance.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:core/editor/editor~Editor}\n\t\t */\n\t\tthis.editor = editor;\n\t}\n\n\t/**\n\t * Registers a handler for the specified keystroke.\n\t *\n\t * The handler can be specified as a command name or a callback.\n\t *\n\t * @param {String|Array.<String|Number>} keystroke Keystroke defined in a format accepted by\n\t * the {@link module:utils/keyboard~parseKeystroke} function.\n\t * @param {Function|String} callback If a string is passed, then the keystroke will\n\t * {@link module:core/editor/editor~Editor#execute execute a command}.\n\t * If a function, then it will be called with the\n\t * {@link module:engine/view/observer/keyobserver~KeyEventData key event data} object and\n\t * a `cancel()` helper to both `preventDefault()` and `stopPropagation()` of the event.\n\t * @param {Object} [options={}] Additional options.\n\t * @param {module:utils/priorities~PriorityString|Number} [options.priority='normal'] The priority of the keystroke\n\t * callback. The higher the priority value the sooner the callback will be executed. Keystrokes having the same priority\n\t * are called in the order they were added.\n\t */\n\tset( keystroke, callback, options = {} ) {\n\t\tif ( typeof callback == 'string' ) {\n\t\t\tconst commandName = callback;\n\n\t\t\tcallback = ( evtData, cancel ) => {\n\t\t\t\tthis.editor.execute( commandName );\n\t\t\t\tcancel();\n\t\t\t};\n\t\t}\n\n\t\tsuper.set( keystroke, callback, options );\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module core/editor/editor\n */\n\nimport Context from '../context';\nimport Config from '@ckeditor/ckeditor5-utils/src/config';\nimport EditingController from '@ckeditor/ckeditor5-engine/src/controller/editingcontroller';\nimport PluginCollection from '../plugincollection';\nimport CommandCollection from '../commandcollection';\nimport DataController from '@ckeditor/ckeditor5-engine/src/controller/datacontroller';\nimport Conversion from '@ckeditor/ckeditor5-engine/src/conversion/conversion';\nimport Model from '@ckeditor/ckeditor5-engine/src/model/model';\nimport EditingKeystrokeHandler from '../editingkeystrokehandler';\n\nimport ObservableMixin from '@ckeditor/ckeditor5-utils/src/observablemixin';\nimport mix from '@ckeditor/ckeditor5-utils/src/mix';\nimport CKEditorError from '@ckeditor/ckeditor5-utils/src/ckeditorerror';\nimport { StylesProcessor } from '@ckeditor/ckeditor5-engine/src/view/stylesmap';\n\n/**\n * The class representing a basic, generic editor.\n *\n * Check out the list of its subclasses to learn about specific editor implementations.\n *\n * All editor implementations (like {@link module:editor-classic/classiceditor~ClassicEditor} or\n * {@link module:editor-inline/inlineeditor~InlineEditor}) should extend this class. They can add their\n * own methods and properties.\n *\n * When you are implementing a plugin, this editor represents the API\n * which your plugin can expect to get when using its {@link module:core/plugin~Plugin#editor} property.\n *\n * This API should be sufficient in order to implement the \"editing\" part of your feature\n * (schema definition, conversion, commands, keystrokes, etc.).\n * It does not define the editor UI, which is available only if\n * the specific editor implements also the {@link module:core/editor/editorwithui~EditorWithUI} interface\n * (as most editor implementations do).\n *\n * @abstract\n * @mixes module:utils/observablemixin~ObservableMixin\n */\nexport default class Editor {\n\t/**\n\t * Creates a new instance of the editor class.\n\t *\n\t * Usually, not to be used directly. See the static {@link module:core/editor/editor~Editor.create `create()`} method.\n\t *\n\t * @param {Object} [config={}] The editor configuration.\n\t */\n\tconstructor( config = {} ) {\n\t\t/**\n\t\t * The editor context.\n\t\t * When it is not provided through the configuration, the editor creates it.\n\t\t *\n\t\t * @protected\n\t\t * @type {module:core/context~Context}\n\t\t */\n\t\tthis._context = config.context || new Context( { language: config.language } );\n\t\tthis._context._addEditor( this, !config.context );\n\n\t\t// Clone the plugins to make sure that the plugin array will not be shared\n\t\t// between editors and make the watchdog feature work correctly.\n\t\tconst availablePlugins = Array.from( this.constructor.builtinPlugins || [] );\n\n\t\t/**\n\t\t * Stores all configurations specific to this editor instance.\n\t\t *\n\t\t *\t\teditor.config.get( 'image.toolbar' );\n\t\t *\t\t// -> [ 'imageStyle:full', 'imageStyle:side', '|', 'imageTextAlternative' ]\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:utils/config~Config}\n\t\t */\n\t\tthis.config = new Config( config, this.constructor.defaultConfig );\n\t\tthis.config.define( 'plugins', availablePlugins );\n\t\tthis.config.define( this._context._getEditorConfig() );\n\n\t\t/**\n\t\t * The plugins loaded and in use by this editor instance.\n\t\t *\n\t\t *\t\teditor.plugins.get( 'Clipboard' ); // -> An instance of the clipboard plugin.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:core/plugincollection~PluginCollection}\n\t\t */\n\t\tthis.plugins = new PluginCollection( this, availablePlugins, this._context.plugins );\n\n\t\t/**\n\t\t * The locale instance.\n\t\t *\n\t\t * @readonly\n\t\t * @type {module:utils/locale~Locale}\n\t\t */\n\t\tthis.locale = this._context.locale;\n\n\t\t/**\n\t\t * Shorthand for {@link module:utils/locale~Locale#t}.\n\t\t *\n\t\t * @see module:utils/locale~Locale#t\n\t\t * @method #t\n\t\t */\n\t\tthis.t = this.locale.t;\n\n\t\t/**\n\t\t * Commands registered to the editor.\n\t\t *\n\t\t * Use the shorthand {@link #execute `editor.execute()`} method to execute commands:\n\t\t *\n\t\t *\t\t// Execute the bold command:\n\t\t *\t\teditor.execute( 'bold' );\n\t\t *\n\t\t *\t\t// Check the state of the bold command:\n\t\t *\t\teditor.commands.get( 'bold' ).value;\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:core/commandcollection~CommandCollection}\n\t\t */\n\t\tthis.commands = new CommandCollection();\n\n\t\t/**\n\t\t * Indicates the editor life-cycle state.\n\t\t *\n\t\t * The editor is in one of the following states:\n\t\t *\n\t\t * * `initializing` &ndash; During the editor initialization (before\n\t\t * {@link module:core/editor/editor~Editor.create `Editor.create()`}) finished its job.\n\t\t * * `ready` &ndash; After the promise returned by the {@link module:core/editor/editor~Editor.create `Editor.create()`}\n\t\t * method is resolved.\n\t\t * * `destroyed` &ndash; Once the {@link #destroy `editor.destroy()`} method was called.\n\t\t *\n\t\t * @observable\n\t\t * @member {'initializing'|'ready'|'destroyed'} #state\n\t\t */\n\t\tthis.set( 'state', 'initializing' );\n\t\tthis.once( 'ready', () => ( this.state = 'ready' ), { priority: 'high' } );\n\t\tthis.once( 'destroy', () => ( this.state = 'destroyed' ), { priority: 'high' } );\n\n\t\t/**\n\t\t * Defines whether this editor is in read-only mode.\n\t\t *\n\t\t * In read-only mode the editor {@link #commands commands} are disabled so it is not possible\n\t\t * to modify the document by using them. Also, the editable element(s) become non-editable.\n\t\t *\n\t\t * In order to make the editor read-only, you can set this value directly:\n\t\t *\n\t\t *\t\teditor.isReadOnly = true;\n\t\t *\n\t\t * @observable\n\t\t * @member {Boolean} #isReadOnly\n\t\t */\n\t\tthis.set( 'isReadOnly', false );\n\n\t\t/**\n\t\t * The editor's model.\n\t\t *\n\t\t * The central point of the editor's abstract data model.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:engine/model/model~Model}\n\t\t */\n\t\tthis.model = new Model();\n\n\t\tconst stylesProcessor = new StylesProcessor();\n\n\t\t/**\n\t\t * The {@link module:engine/controller/datacontroller~DataController data controller}.\n\t\t * Used e.g. for setting and retrieving the editor data.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:engine/controller/datacontroller~DataController}\n\t\t */\n\t\tthis.data = new DataController( this.model, stylesProcessor );\n\n\t\t/**\n\t\t * The {@link module:engine/controller/editingcontroller~EditingController editing controller}.\n\t\t * Controls user input and rendering the content for editing.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:engine/controller/editingcontroller~EditingController}\n\t\t */\n\t\tthis.editing = new EditingController( this.model, stylesProcessor );\n\t\tthis.editing.view.document.bind( 'isReadOnly' ).to( this );\n\n\t\t/**\n\t\t * Conversion manager through which you can register model-to-view and view-to-model converters.\n\t\t *\n\t\t * See the {@link module:engine/conversion/conversion~Conversion} documentation to learn how to add converters.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:engine/conversion/conversion~Conversion}\n\t\t */\n\t\tthis.conversion = new Conversion( [ this.editing.downcastDispatcher, this.data.downcastDispatcher ], this.data.upcastDispatcher );\n\t\tthis.conversion.addAlias( 'dataDowncast', this.data.downcastDispatcher );\n\t\tthis.conversion.addAlias( 'editingDowncast', this.editing.downcastDispatcher );\n\n\t\t/**\n\t\t * An instance of the {@link module:core/editingkeystrokehandler~EditingKeystrokeHandler}.\n\t\t *\n\t\t * It allows setting simple keystrokes:\n\t\t *\n\t\t *\t\t// Execute the bold command on Ctrl+E:\n\t\t *\t\teditor.keystrokes.set( 'Ctrl+E', 'bold' );\n\t\t *\n\t\t *\t\t// Execute your own callback:\n\t\t *\t\teditor.keystrokes.set( 'Ctrl+E', ( data, cancel ) => {\n\t\t *\t\t\tconsole.log( data.keyCode );\n\t\t *\n\t\t *\t\t\t// Prevent the default (native) action and stop the underlying keydown event\n\t\t *\t\t\t// so no other editor feature will interfere.\n\t\t *\t\t\tcancel();\n\t\t *\t\t} );\n\t\t *\n\t\t * Note: Certain typing-oriented keystrokes (like <kbd>Backspace</kbd> or <kbd>Enter</kbd>) are handled\n\t\t * by a low-level mechanism and trying to listen to them via the keystroke handler will not work reliably.\n\t\t * To handle these specific keystrokes, see the events fired by the\n\t\t * {@link module:engine/view/document~Document editing view document} (`editor.editing.view.document`).\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:core/editingkeystrokehandler~EditingKeystrokeHandler}\n\t\t */\n\t\tthis.keystrokes = new EditingKeystrokeHandler( this );\n\t\tthis.keystrokes.listenTo( this.editing.view.document );\n\t}\n\n\t/**\n\t * Loads and initializes plugins specified in the configuration.\n\t *\n\t * @returns {Promise.<module:core/plugin~LoadedPlugins>} A promise which resolves\n\t * once the initialization is completed, providing an array of loaded plugins.\n\t */\n\tinitPlugins() {\n\t\tconst config = this.config;\n\t\tconst plugins = config.get( 'plugins' );\n\t\tconst removePlugins = config.get( 'removePlugins' ) || [];\n\t\tconst extraPlugins = config.get( 'extraPlugins' ) || [];\n\n\t\treturn this.plugins.init( plugins.concat( extraPlugins ), removePlugins );\n\t}\n\n\t/**\n\t * Destroys the editor instance, releasing all resources used by it.\n\t *\n\t * **Note** The editor cannot be destroyed during the initialization phase so if it is called\n\t * while the editor {@link #state is being initialized}, it will wait for the editor initialization before destroying it.\n\t *\n\t * @fires destroy\n\t * @returns {Promise} A promise that resolves once the editor instance is fully destroyed.\n\t */\n\tdestroy() {\n\t\tlet readyPromise = Promise.resolve();\n\n\t\tif ( this.state == 'initializing' ) {\n\t\t\treadyPromise = new Promise( resolve => this.once( 'ready', resolve ) );\n\t\t}\n\n\t\treturn readyPromise\n\t\t\t.then( () => {\n\t\t\t\tthis.fire( 'destroy' );\n\t\t\t\tthis.stopListening();\n\t\t\t\tthis.commands.destroy();\n\t\t\t} )\n\t\t\t.then( () => this.plugins.destroy() )\n\t\t\t.then( () => {\n\t\t\t\tthis.model.destroy();\n\t\t\t\tthis.data.destroy();\n\t\t\t\tthis.editing.destroy();\n\t\t\t\tthis.keystrokes.destroy();\n\t\t\t} )\n\t\t\t// Remove the editor from the context.\n\t\t\t// When the context was created by this editor, the context will be destroyed.\n\t\t\t.then( () => this._context._removeEditor( this ) );\n\t}\n\n\t/**\n\t * Executes the specified command with given parameters.\n\t *\n\t * Shorthand for:\n\t *\n\t *\t\teditor.commands.get( commandName ).execute( ... );\n\t *\n\t * @param {String} commandName The name of the command to execute.\n\t * @param {*} [...commandParams] Command parameters.\n\t * @returns {*} The value returned by the {@link module:core/commandcollection~CommandCollection#execute `commands.execute()`}.\n\t */\n\texecute( ...args ) {\n\t\ttry {\n\t\t\treturn this.commands.execute( ...args );\n\t\t} catch ( err ) {\n\t\t\t// @if CK_DEBUG // throw err;\n\t\t\t/* istanbul ignore next */\n\t\t\tCKEditorError.rethrowUnexpectedError( err, this );\n\t\t}\n\t}\n\n\t/**\n\t * Focuses the editor.\n\t *\n\t * **Note** To explicitly focus the editing area of the editor, use\n\t * {@link module:engine/view/view~View#focus `editor.editing.view.focus()`} method of the editing view.\n\t *\n\t * Check out the {@glink framework/guides/deep-dive/ui/focus-tracking#focus-in-the-editor-ui \"Focus in the editor ui\"} section\n\t * of the {@glink framework/guides/deep-dive/ui/focus-tracking \"Deep dive into focus tracking\" guide} to learn more.\n\t */\n\tfocus() {\n\t\tthis.editing.view.focus();\n\t}\n\n\t/**\n\t * Creates and initializes a new editor instance.\n\t *\n\t * This is an abstract method. Every editor type needs to implement its own initialization logic.\n\t *\n\t * See the `create()` methods of the existing editor types to learn how to use them:\n\t *\n\t * * {@link module:editor-classic/classiceditor~ClassicEditor.create `ClassicEditor.create()`}\n\t * * {@link module:editor-balloon/ballooneditor~BalloonEditor.create `BalloonEditor.create()`}\n\t * * {@link module:editor-decoupled/decouplededitor~DecoupledEditor.create `DecoupledEditor.create()`}\n\t * * {@link module:editor-inline/inlineeditor~InlineEditor.create `InlineEditor.create()`}\n\t *\n\t * @abstract\n\t * @method module:core/editor/editor~Editor.create\n\t */\n}\n\nmix( Editor, ObservableMixin );\n\n/**\n * Fired when the {@link module:engine/controller/datacontroller~DataController#event:ready data} and all additional\n * editor components are ready.\n *\n * Note: This event is most useful for plugin developers. When integrating the editor with your website or\n * application, you do not have to listen to `editor#ready` because when the promise returned by the static\n * {@link module:core/editor/editor~Editor.create `Editor.create()`} event is resolved, the editor is already ready.\n * In fact, since the first moment when the editor instance is available to you is inside `then()`'s callback,\n * you cannot even add a listener to the `editor#ready` event.\n *\n * See also the {@link #state `editor.state`} property.\n *\n * @event ready\n */\n\n/**\n * Fired when this editor instance is destroyed. The editor at this point is not usable and this event should be used to\n * perform the clean-up in any plugin.\n *\n *\n * See also the {@link #state `editor.state`} property.\n *\n * @event destroy\n */\n\n/**\n * This error is thrown when trying to pass a `<textarea>` element to a `create()` function of an editor class.\n *\n * The only editor type which can be initialized on `<textarea>` elements is {@glink builds/guides/overview#classic-editor classic editor}.\n * This editor hides the passed element and inserts its own UI next to it. Other types of editors reuse the passed element as their root\n * editable element and therefore `<textarea>` is not appropriate for them. Use a `<div>` or another text container instead:\n *\n *\t\t<div id=\"editor\">\n *\t\t\t<p>Initial content.</p>\n *\t\t</div>\n *\n * @error editor-wrong-element\n */\n\n/**\n * An array of plugins built into this editor class.\n *\n * It is used in CKEditor 5 builds to provide a list of plugins which are later automatically initialized\n * during the editor initialization.\n *\n * They will be automatically initialized by the editor, unless listed in `config.removePlugins` and\n * unless `config.plugins` is passed.\n *\n *\t\t// Build some plugins into the editor class first.\n *\t\tClassicEditor.builtinPlugins = [ FooPlugin, BarPlugin ];\n *\n *\t\t// Normally, you need to define config.plugins, but since ClassicEditor.builtinPlugins was\n *\t\t// defined, now you can call create() without any configuration.\n *\t\tClassicEditor\n *\t\t\t.create( sourceElement )\n *\t\t\t.then( editor => {\n *\t\t\t\teditor.plugins.get( FooPlugin ); // -> An instance of the Foo plugin.\n *\t\t\t\teditor.plugins.get( BarPlugin ); // -> An instance of the Bar plugin.\n *\t\t\t} );\n *\n *\t\tClassicEditor\n *\t\t\t.create( sourceElement, {\n *\t\t\t\t// Do not initialize these plugins (note: it is defined by a string):\n *\t\t\t\tremovePlugins: [ 'Foo' ]\n *\t\t\t} )\n *\t\t\t.then( editor => {\n *\t\t\t\teditor.plugins.get( FooPlugin ); // -> Undefined.\n *\t\t\t\teditor.config.get( BarPlugin ); // -> An instance of the Bar plugin.\n *\t\t\t} );\n *\n *\t\tClassicEditor\n *\t\t\t.create( sourceElement, {\n *\t\t\t\t// Load only this plugin. It can also be defined by a string if\n *\t\t\t\t// this plugin was built into the editor class.\n *\t\t\t\tplugins: [ FooPlugin ]\n *\t\t\t} )\n *\t\t\t.then( editor => {\n *\t\t\t\teditor.plugins.get( FooPlugin ); // -> An instance of the Foo plugin.\n *\t\t\t\teditor.config.get( BarPlugin ); // -> Undefined.\n *\t\t\t} );\n *\n * See also {@link module:core/editor/editor~Editor.defaultConfig}.\n *\n * @static\n * @member {Array.<Function>} module:core/editor/editor~Editor.builtinPlugins\n */\n\n/**\n * The default configuration which is built into the editor class.\n *\n * It is used in CKEditor 5 builds to provide the default configuration options which are later used during the editor initialization.\n *\n *\t\tClassicEditor.defaultConfig = {\n *\t\t\tfoo: 1,\n *\t\t\tbar: 2\n *\t\t};\n *\n *\t\tClassicEditor\n *\t\t\t.create( sourceElement )\n *\t\t\t.then( editor => {\n *\t\t\t\teditor.config.get( 'foo' ); // -> 1\n *\t\t\t\teditor.config.get( 'bar' ); // -> 2\n *\t\t\t} );\n *\n *\t\t// The default options can be overridden by the configuration passed to create().\n *\t\tClassicEditor\n *\t\t\t.create( sourceElement, { bar: 3 } )\n *\t\t\t.then( editor => {\n *\t\t\t\teditor.config.get( 'foo' ); // -> 1\n *\t\t\t\teditor.config.get( 'bar' ); // -> 3\n *\t\t\t} );\n *\n * See also {@link module:core/editor/editor~Editor.builtinPlugins}.\n *\n * @static\n * @member {Object} module:core/editor/editor~Editor.defaultConfig\n */\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module core/editor/utils/dataapimixin\n */\n\n/**\n * Implementation of the {@link module:core/editor/utils/dataapimixin~DataApi}.\n *\n * @mixin DataApiMixin\n * @implements module:core/editor/utils/dataapimixin~DataApi\n */\nconst DataApiMixin = {\n\t/**\n\t * @inheritDoc\n\t */\n\tsetData( data ) {\n\t\tthis.data.set( data );\n\t},\n\n\t/**\n\t * @inheritDoc\n\t */\n\tgetData( options ) {\n\t\treturn this.data.get( options );\n\t}\n};\n\nexport default DataApiMixin;\n\n/**\n * Interface defining editor methods for setting and getting data to and from the editor's main root element\n * using the {@link module:core/editor/editor~Editor#data data pipeline}.\n *\n * This interface is not a part of the {@link module:core/editor/editor~Editor} class because one may want to implement\n * an editor with multiple root elements, in which case the methods for setting and getting data will need to be implemented\n * differently.\n *\n * @interface DataApi\n */\n\n/**\n * Sets the data in the editor.\n *\n *\t\teditor.setData( '<p>This is editor!</p>' );\n *\n * By default the editor accepts HTML. This can be controlled by injecting a different data processor.\n * See the {@glink features/markdown Markdown output} guide for more details.\n *\n * Note: Not only is the format of the data configurable, but the type of the `setData()`'s parameter does not\n * have to be a string either. You can e.g. accept an object or a DOM `DocumentFragment` if you consider this\n * the right format for you.\n *\n * @method #setData\n * @param {String} data Input data.\n */\n\n/**\n * Gets the data from the editor.\n *\n *\t\teditor.getData(); // -> '<p>This is editor!</p>'\n *\n * By default the editor outputs HTML. This can be controlled by injecting a different data processor.\n * See the {@glink features/markdown Markdown output} guide for more details.\n *\n * Note: Not only is the format of the data configurable, but the type of the `getData()`'s return value does not\n * have to be a string either. You can e.g. return an object or a DOM `DocumentFragment` if you consider this\n * the right format for you.\n *\n * @method #getData\n * @param {Object} [options] Additional configuration for the retrieved data.\n * Editor features may introduce more configuration options that can be set through this parameter.\n * @param {String} [options.rootName='main'] Root name.\n * @param {String} [options.trim='empty'] Whether returned data should be trimmed. This option is set to `'empty'` by default,\n * which means that whenever editor content is considered empty, an empty string is returned. To turn off trimming\n * use `'none'`. In such cases exact content will be returned (for example `'<p>&nbsp;</p>'` for an empty editor).\n * @returns {String} Output data.\n */\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\nimport CKEditorError from '@ckeditor/ckeditor5-utils/src/ckeditorerror';\nimport setDataInElement from '@ckeditor/ckeditor5-utils/src/dom/setdatainelement';\n\n/**\n * @module core/editor/utils/elementapimixin\n */\n\n/**\n * Implementation of the {@link module:core/editor/utils/elementapimixin~ElementApi}.\n *\n * @mixin ElementApiMixin\n * @implements module:core/editor/utils/elementapimixin~ElementApi\n */\nconst ElementApiMixin = {\n\t/**\n\t * @inheritDoc\n\t */\n\tupdateSourceElement() {\n\t\tif ( !this.sourceElement ) {\n\t\t\t/**\n\t\t\t * Cannot update the source element of a detached editor.\n\t\t\t *\n\t\t\t * The {@link ~ElementApi#updateSourceElement `updateSourceElement()`} method cannot be called if you did not\n\t\t\t * pass an element to `Editor.create()`.\n\t\t\t *\n\t\t\t * @error editor-missing-sourceelement\n\t\t\t */\n\t\t\tthrow new CKEditorError(\n\t\t\t\t'editor-missing-sourceelement',\n\t\t\t\tthis\n\t\t\t);\n\t\t}\n\n\t\tsetDataInElement( this.sourceElement, this.data.get() );\n\t}\n};\n\nexport default ElementApiMixin;\n\n/**\n * Interface describing an editor that replaced a DOM element (was \"initialized on an element\").\n *\n * Such an editor should provide a method to\n * {@link module:core/editor/utils/elementapimixin~ElementApi#updateSourceElement update the replaced element with the current data}.\n *\n * @interface ElementApi\n */\n\n/**\n * The element on which the editor has been initialized.\n *\n * @readonly\n * @member {HTMLElement} #sourceElement\n */\n\n/**\n * Updates the {@link #sourceElement editor source element}'s content with the data.\n *\n * @method #updateSourceElement\n */\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module utils/dom/setdatainelement\n */\n\n/* globals HTMLTextAreaElement */\n\n/**\n * Sets data in a given element.\n *\n * @param {HTMLElement} el The element in which the data will be set.\n * @param {String} data The data string.\n */\nexport default function setDataInElement( el, data ) {\n\tif ( el instanceof HTMLTextAreaElement ) {\n\t\tel.value = data;\n\t}\n\n\tel.innerHTML = data;\n}\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module engine/dataprocessor/basichtmlwriter\n */\n\n/* globals document */\n\n/**\n * Basic HTML writer. It uses the native `innerHTML` property for basic conversion\n * from a document fragment to an HTML string.\n *\n * @implements module:engine/dataprocessor/htmlwriter~HtmlWriter\n */\nexport default class BasicHtmlWriter {\n\t/**\n\t * Returns an HTML string created from the document fragment.\n\t *\n\t * @param {DocumentFragment} fragment\n\t * @returns {String}\n\t */\n\tgetHtml( fragment ) {\n\t\tconst doc = document.implementation.createHTMLDocument( '' );\n\t\tconst container = doc.createElement( 'div' );\n\t\tcontainer.appendChild( fragment );\n\n\t\treturn container.innerHTML;\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module engine/dataprocessor/htmldataprocessor\n */\n\n/* globals document, DOMParser */\n\nimport BasicHtmlWriter from './basichtmlwriter';\nimport DomConverter from '../view/domconverter';\n\n/**\n * The HTML data processor class.\n * This data processor implementation uses HTML as input and output data.\n *\n * @implements module:engine/dataprocessor/dataprocessor~DataProcessor\n */\nexport default class HtmlDataProcessor {\n\t/**\n\t * Creates a new instance of the HTML data processor class.\n\t *\n\t * @param {module:engine/view/document~Document} document The view document instance.\n\t */\n\tconstructor( document ) {\n\t\t/**\n\t\t * A DOM parser instance used to parse an HTML string to an HTML document.\n\t\t *\n\t\t * @private\n\t\t * @member {DOMParser}\n\t\t */\n\t\tthis._domParser = new DOMParser();\n\n\t\t/**\n\t\t * A DOM converter used to convert DOM elements to view elements.\n\t\t *\n\t\t * @private\n\t\t * @member {module:engine/view/domconverter~DomConverter}\n\t\t */\n\t\tthis._domConverter = new DomConverter( document, { blockFillerMode: 'nbsp' } );\n\n\t\t/**\n\t\t * A basic HTML writer instance used to convert DOM elements to an HTML string.\n\t\t *\n\t\t * @private\n\t\t * @member {module:engine/dataprocessor/basichtmlwriter~BasicHtmlWriter}\n\t\t */\n\t\tthis._htmlWriter = new BasicHtmlWriter();\n\t}\n\n\t/**\n\t * Converts a provided {@link module:engine/view/documentfragment~DocumentFragment document fragment}\n\t * to data format &mdash; in this case to an HTML string.\n\t *\n\t * @param {module:engine/view/documentfragment~DocumentFragment} viewFragment\n\t * @returns {String} HTML string.\n\t */\n\ttoData( viewFragment ) {\n\t\t// Convert view DocumentFragment to DOM DocumentFragment.\n\t\tconst domFragment = this._domConverter.viewToDom( viewFragment, document );\n\n\t\t// Convert DOM DocumentFragment to HTML output.\n\t\treturn this._htmlWriter.getHtml( domFragment );\n\t}\n\n\t/**\n\t * Converts the provided HTML string to a view tree.\n\t *\n\t * @param {String} data An HTML string.\n\t * @returns {module:engine/view/node~Node|module:engine/view/documentfragment~DocumentFragment|null} A converted view element.\n\t */\n\ttoView( data ) {\n\t\t// Convert input HTML data to DOM DocumentFragment.\n\t\tconst domFragment = this._toDom( data );\n\n\t\t// Convert DOM DocumentFragment to view DocumentFragment.\n\t\treturn this._domConverter.domToView( domFragment );\n\t}\n\n\t/**\n\t * Registers a {@link module:engine/view/matcher~MatcherPattern} for view elements whose content should be treated as a raw data\n\t * and not processed during conversion from DOM to view elements.\n\t *\n\t * The raw data can be later accessed by {@link module:engine/view/element~Element#getCustomProperty view element custom property}\n\t * `\"$rawContent\"`.\n\t *\n\t * @param {module:engine/view/matcher~MatcherPattern} pattern Pattern matching all view elements whose content should\n\t * be treated as a raw data.\n\t */\n\tregisterRawContentMatcher( pattern ) {\n\t\tthis._domConverter.registerRawContentMatcher( pattern );\n\t}\n\n\t/**\n\t * Converts an HTML string to its DOM representation. Returns a document fragment containing nodes parsed from\n\t * the provided data.\n\t *\n\t * @private\n\t * @param {String} data\n\t * @returns {DocumentFragment}\n\t */\n\t_toDom( data ) {\n\t\tconst document = this._domParser.parseFromString( data, 'text/html' );\n\t\tconst fragment = document.createDocumentFragment();\n\t\tconst nodes = document.body.childNodes;\n\n\t\twhile ( nodes.length > 0 ) {\n\t\t\tfragment.appendChild( nodes[ 0 ] );\n\t\t}\n\n\t\treturn fragment;\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module ui/componentfactory\n */\n\nimport CKEditorError from '@ckeditor/ckeditor5-utils/src/ckeditorerror';\n\n/**\n * A helper class implementing the UI component ({@link module:ui/view~View view}) factory.\n *\n * It allows functions producing specific UI components to be registered under their unique names\n * in the factory. A registered component can be then instantiated by providing its name.\n * Note that names are case insensitive.\n *\n *\t\t// The editor provides localization tools for the factory.\n *\t\tconst factory = new ComponentFactory( editor );\n *\n *\t\tfactory.add( 'foo', locale => new FooView( locale ) );\n *\t\tfactory.add( 'bar', locale => new BarView( locale ) );\n *\n *\t\t// An instance of FooView.\n *\t\tconst fooInstance = factory.create( 'foo' );\n *\n *\t\t// Names are case insensitive so this is also allowed:\n *\t\tconst barInstance = factory.create( 'Bar' );\n *\n * The {@link module:core/editor/editor~Editor#locale editor locale} is passed to the factory\n * function when {@link module:ui/componentfactory~ComponentFactory#create} is called.\n */\nexport default class ComponentFactory {\n\t/**\n\t * Creates an instance of the factory.\n\t *\n\t * @constructor\n\t * @param {module:core/editor/editor~Editor} editor The editor instance.\n\t */\n\tconstructor( editor ) {\n\t\t/**\n\t\t * The editor instance that the factory belongs to.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:core/editor/editor~Editor}\n\t\t */\n\t\tthis.editor = editor;\n\n\t\t/**\n\t\t * Registered component factories.\n\t\t *\n\t\t * @private\n\t\t * @member {Map}\n\t\t */\n\t\tthis._components = new Map();\n\t}\n\n\t/**\n\t * Returns an iterator of registered component names. Names are returned in lower case.\n\t *\n\t * @returns {Iterable.<String>}\n\t */\n\t* names() {\n\t\tfor ( const value of this._components.values() ) {\n\t\t\tyield value.originalName;\n\t\t}\n\t}\n\n\t/**\n\t * Registers a component factory function that will be used by the\n\t * {@link #create create} method and called with the\n\t * {@link module:core/editor/editor~Editor#locale editor locale} as an argument,\n\t * allowing localization of the {@link module:ui/view~View view}.\n\t *\n\t * @param {String} name The name of the component.\n\t * @param {Function} callback The callback that returns the component.\n\t */\n\tadd( name, callback ) {\n\t\tthis._components.set( getNormalized( name ), { callback, originalName: name } );\n\t}\n\n\t/**\n\t * Creates an instance of a component registered in the factory under a specific name.\n\t *\n\t * When called, the {@link module:core/editor/editor~Editor#locale editor locale} is passed to\n\t * the previously {@link #add added} factory function, allowing localization of the\n\t * {@link module:ui/view~View view}.\n\t *\n\t * @param {String} name The name of the component.\n\t * @returns {module:ui/view~View} The instantiated component view.\n\t */\n\tcreate( name ) {\n\t\tif ( !this.has( name ) ) {\n\t\t\t/**\n\t\t\t * The required component is not registered in the component factory. Please make sure\n\t\t\t * the provided name is correct and the component has been correctly\n\t\t\t * {@link #add added} to the factory.\n\t\t\t *\n\t\t\t * @error componentfactory-item-missing\n\t\t\t * @param {String} name The name of the missing component.\n\t\t\t */\n\t\t\tthrow new CKEditorError(\n\t\t\t\t'componentfactory-item-missing',\n\t\t\t\tthis,\n\t\t\t\t{ name }\n\t\t\t);\n\t\t}\n\n\t\treturn this._components.get( getNormalized( name ) ).callback( this.editor.locale );\n\t}\n\n\t/**\n\t * Checks if a component of a given name is registered in the factory.\n\t *\n\t * @param {String} name The name of the component.\n\t * @returns {Boolean}\n\t */\n\thas( name ) {\n\t\treturn this._components.has( getNormalized( name ) );\n\t}\n}\n\n//\n// Ensures that the component name used as the key in the internal map is in lower case.\n//\n// @private\n// @param {String} name\n// @returns {String}\nfunction getNormalized( name ) {\n\treturn String( name ).toLowerCase();\n}\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/* global setTimeout, clearTimeout */\n\n/**\n * @module utils/focustracker\n */\n\nimport DomEmitterMixin from './dom/emittermixin';\nimport ObservableMixin from './observablemixin';\nimport CKEditorError from './ckeditorerror';\nimport mix from './mix';\n\n/**\n * Allows observing a group of `HTMLElement`s whether at least one of them is focused.\n *\n * Used by the {@link module:core/editor/editor~Editor} in order to track whether the focus is still within the application,\n * or were used outside of its UI.\n *\n * **Note** `focus` and `blur` listeners use event capturing, so it is only needed to register wrapper `HTMLElement`\n * which contain other `focusable` elements. But note that this wrapper element has to be focusable too\n * (have e.g. `tabindex=\"-1\"`).\n *\n * Check out the {@glink framework/guides/deep-dive/ui/focus-tracking \"Deep dive into focus tracking\" guide} to learn more.\n *\n * @mixes module:utils/dom/emittermixin~EmitterMixin\n * @mixes module:utils/observablemixin~ObservableMixin\n */\nexport default class FocusTracker {\n\tconstructor() {\n\t\t/**\n\t\t * True when one of the registered elements is focused.\n\t\t *\n\t\t * @readonly\n\t\t * @observable\n\t\t * @member {Boolean} #isFocused\n\t\t */\n\t\tthis.set( 'isFocused', false );\n\n\t\t/**\n\t\t * The currently focused element.\n\t\t *\n\t\t * While {@link #isFocused `isFocused`} remains `true`, the focus can\n\t\t * move between different UI elements. This property tracks those\n\t\t * elements and tells which one is currently focused.\n\t\t *\n\t\t * @readonly\n\t\t * @observable\n\t\t * @member {HTMLElement|null} #focusedElement\n\t\t */\n\t\tthis.set( 'focusedElement', null );\n\n\t\t/**\n\t\t * List of registered elements.\n\t\t *\n\t\t * @private\n\t\t * @member {Set.<HTMLElement>}\n\t\t */\n\t\tthis._elements = new Set();\n\n\t\t/**\n\t\t * Event loop timeout.\n\t\t *\n\t\t * @private\n\t\t * @member {Number}\n\t\t */\n\t\tthis._nextEventLoopTimeout = null;\n\t}\n\n\t/**\n\t * Starts tracking the specified element.\n\t *\n\t * @param {HTMLElement} element\n\t */\n\tadd( element ) {\n\t\tif ( this._elements.has( element ) ) {\n\t\t\t/**\n\t\t\t * This element is already tracked by {@link module:utils/focustracker~FocusTracker}.\n\t\t\t *\n\t\t\t * @error focustracker-add-element-already-exist\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'focustracker-add-element-already-exist', this );\n\t\t}\n\n\t\tthis.listenTo( element, 'focus', () => this._focus( element ), { useCapture: true } );\n\t\tthis.listenTo( element, 'blur', () => this._blur(), { useCapture: true } );\n\t\tthis._elements.add( element );\n\t}\n\n\t/**\n\t * Stops tracking the specified element and stops listening on this element.\n\t *\n\t * @param {HTMLElement} element\n\t */\n\tremove( element ) {\n\t\tif ( element === this.focusedElement ) {\n\t\t\tthis._blur( element );\n\t\t}\n\n\t\tif ( this._elements.has( element ) ) {\n\t\t\tthis.stopListening( element );\n\t\t\tthis._elements.delete( element );\n\t\t}\n\t}\n\n\t/**\n\t * Destroys the focus tracker by:\n\t * - Disabling all event listeners attached to tracked elements.\n\t * - Removing all tracked elements that were previously added.\n\t */\n\tdestroy() {\n\t\tthis.stopListening();\n\t}\n\n\t/**\n\t * Stores currently focused element and set {#isFocused} as `true`.\n\t *\n\t * @private\n\t * @param {HTMLElement} element Element which has been focused.\n\t */\n\t_focus( element ) {\n\t\tclearTimeout( this._nextEventLoopTimeout );\n\n\t\tthis.focusedElement = element;\n\t\tthis.isFocused = true;\n\t}\n\n\t/**\n\t * Clears currently focused element and set {@link #isFocused} as `false`.\n\t * This method uses `setTimeout` to change order of fires `blur` and `focus` events.\n\t *\n\t * @private\n\t * @fires blur\n\t */\n\t_blur() {\n\t\tclearTimeout( this._nextEventLoopTimeout );\n\n\t\tthis._nextEventLoopTimeout = setTimeout( () => {\n\t\t\tthis.focusedElement = null;\n\t\t\tthis.isFocused = false;\n\t\t}, 0 );\n\t}\n\n\t/**\n\t * @event focus\n\t */\n\n\t/**\n\t * @event blur\n\t */\n}\n\nmix( FocusTracker, DomEmitterMixin );\nmix( FocusTracker, ObservableMixin );\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module core/editor/editorui\n */\n\n/* globals console */\n\nimport ComponentFactory from '@ckeditor/ckeditor5-ui/src/componentfactory';\nimport FocusTracker from '@ckeditor/ckeditor5-utils/src/focustracker';\n\nimport EmitterMixin from '@ckeditor/ckeditor5-utils/src/emittermixin';\nimport mix from '@ckeditor/ckeditor5-utils/src/mix';\n\n/**\n * A class providing the minimal interface that is required to successfully bootstrap any editor UI.\n *\n * @mixes module:utils/emittermixin~EmitterMixin\n */\nexport default class EditorUI {\n\t/**\n\t * Creates an instance of the editor UI class.\n\t *\n\t * @param {module:core/editor/editor~Editor} editor The editor instance.\n\t */\n\tconstructor( editor ) {\n\t\t/**\n\t\t * The editor that the UI belongs to.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:core/editor/editor~Editor} #editor\n\t\t */\n\t\tthis.editor = editor;\n\n\t\t/**\n\t\t * An instance of the {@link module:ui/componentfactory~ComponentFactory}, a registry used by plugins\n\t\t * to register factories of specific UI components.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:ui/componentfactory~ComponentFactory} #componentFactory\n\t\t */\n\t\tthis.componentFactory = new ComponentFactory( editor );\n\n\t\t/**\n\t\t * Stores the information about the editor UI focus and propagates it so various plugins and components\n\t\t * are unified as a focus group.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:utils/focustracker~FocusTracker} #focusTracker\n\t\t */\n\t\tthis.focusTracker = new FocusTracker();\n\n\t\t/**\n\t\t * Stores all editable elements used by the editor instance.\n\t\t *\n\t\t * @private\n\t\t * @member {Map.<String,HTMLElement>}\n\t\t */\n\t\tthis._editableElementsMap = new Map();\n\n\t\t// Informs UI components that should be refreshed after layout change.\n\t\tthis.listenTo( editor.editing.view.document, 'layoutChanged', () => this.update() );\n\t}\n\n\t/**\n\t * The main (outermost) DOM element of the editor UI.\n\t *\n\t * For example, in {@link module:editor-classic/classiceditor~ClassicEditor} it is a `<div>` which\n\t * wraps the editable element and the toolbar. In {@link module:editor-inline/inlineeditor~InlineEditor}\n\t * it is the editable element itself (as there is no other wrapper). However, in\n\t * {@link module:editor-decoupled/decouplededitor~DecoupledEditor} it is set to `null` because this editor does not\n\t * come with a single \"main\" HTML element (its editable element and toolbar are separate).\n\t *\n\t * This property can be understood as a shorthand for retrieving the element that a specific editor integration\n\t * considers to be its main DOM element.\n\t *\n\t * @readonly\n\t * @member {HTMLElement|null} #element\n\t */\n\tget element() {\n\t\treturn null;\n\t}\n\n\t/**\n\t * Fires the {@link module:core/editor/editorui~EditorUI#event:update `update`} event.\n\t *\n\t * This method should be called when the editor UI (e.g. positions of its balloons) needs to be updated due to\n\t * some environmental change which CKEditor 5 is not aware of (e.g. resize of a container in which it is used).\n\t */\n\tupdate() {\n\t\tthis.fire( 'update' );\n\t}\n\n\t/**\n\t * Destroys the UI.\n\t */\n\tdestroy() {\n\t\tthis.stopListening();\n\n\t\tthis.focusTracker.destroy();\n\n\t\t// Clean–up the references to the CKEditor instance stored in the native editable DOM elements.\n\t\tfor ( const domElement of this._editableElementsMap.values() ) {\n\t\t\tdomElement.ckeditorInstance = null;\n\t\t}\n\n\t\tthis._editableElementsMap = new Map();\n\t}\n\n\t/**\n\t * Store the native DOM editable element used by the editor under\n\t * a unique name.\n\t *\n\t * @param {String} rootName The unique name of the editable element.\n\t * @param {HTMLElement} domElement The native DOM editable element.\n\t */\n\tsetEditableElement( rootName, domElement ) {\n\t\tthis._editableElementsMap.set( rootName, domElement );\n\n\t\t// Put a reference to the CKEditor instance in the editable native DOM element.\n\t\t// It helps 3rd–party software (browser extensions, other libraries) access and recognize\n\t\t// CKEditor 5 instances (editing roots) and use their API (there is no global editor\n\t\t// instance registry).\n\t\tif ( !domElement.ckeditorInstance ) {\n\t\t\tdomElement.ckeditorInstance = this.editor;\n\t\t}\n\t}\n\n\t/**\n\t * Returns the editable editor element with the given name or null if editable does not exist.\n\t *\n\t * @param {String} [rootName=main] The editable name.\n\t * @returns {HTMLElement|undefined}\n\t */\n\tgetEditableElement( rootName = 'main' ) {\n\t\treturn this._editableElementsMap.get( rootName );\n\t}\n\n\t/**\n\t * Returns array of names of all editor editable elements.\n\t *\n\t * @returns {Iterable.<String>}\n\t */\n\tgetEditableElementsNames() {\n\t\treturn this._editableElementsMap.keys();\n\t}\n\n\t/**\n\t * Stores all editable elements used by the editor instance.\n\t *\n\t * @protected\n\t * @deprecated\n\t * @member {Map.<String,HTMLElement>}\n\t */\n\tget _editableElements() {\n\t\t/**\n\t\t * The {@link module:core/editor/editorui~EditorUI#_editableElements `EditorUI#_editableElements`} property has been\n\t\t * deprecated and will be removed in the near future. Please use {@link #setEditableElement `setEditableElement()`} and\n\t\t * {@link #getEditableElement `getEditableElement()`} methods instead.\n\t\t *\n\t\t * @error editor-ui-deprecated-editable-elements\n\t\t * @param {module:core/editor/editorui~EditorUI} editorUI Editor UI instance the deprecated property belongs to.\n\t\t */\n\t\tconsole.warn(\n\t\t\t'editor-ui-deprecated-editable-elements: ' +\n\t\t\t'The EditorUI#_editableElements property has been deprecated and will be removed in the near future.',\n\t\t\t{ editorUI: this } );\n\n\t\treturn this._editableElementsMap;\n\t}\n\n\t/**\n\t * Fired when the editor UI is ready.\n\t *\n\t * Fired before {@link module:engine/controller/datacontroller~DataController#event:ready}.\n\t *\n\t * @event ready\n\t */\n\n\t/**\n\t * Fired whenever the UI (all related components) should be refreshed.\n\t *\n\t * **Note:**: The event is fired after each {@link module:engine/view/document~Document#event:layoutChanged}.\n\t * It can also be fired manually via the {@link module:core/editor/editorui~EditorUI#update} method.\n\t *\n\t * @event update\n\t */\n}\n\nmix( EditorUI, EmitterMixin );\n","import api from \"!../../../style-loader/dist/runtime/injectStylesIntoStyleTag.js\";\n            import content from \"!!../../../css-loader/dist/cjs.js!../../../postcss-loader/dist/cjs.js??ref--5-2!./placeholder.css\";\n\nvar options = {\"injectType\":\"singletonStyleTag\",\"attributes\":{\"data-cke\":true}};\n\noptions.insert = \"head\";\noptions.singleton = true;\n\nvar update = api(content, options);\n\n\n\nexport default content.locals || {};","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module engine/view/placeholder\n */\n\nimport '../../theme/placeholder.css';\n\n// Each document stores information about its placeholder elements and check functions.\nconst documentPlaceholders = new WeakMap();\n\n/**\n * A helper that enables a placeholder on the provided view element (also updates its visibility).\n * The placeholder is a CSS pseudo–element (with a text content) attached to the element.\n *\n * To change the placeholder text, simply call this method again with new options.\n *\n * To disable the placeholder, use {@link module:engine/view/placeholder~disablePlaceholder `disablePlaceholder()`} helper.\n *\n * @param {Object} [options] Configuration options of the placeholder.\n * @param {module:engine/view/view~View} options.view Editing view instance.\n * @param {module:engine/view/element~Element} options.element Element that will gain a placeholder.\n * See `options.isDirectHost` to learn more.\n * @param {String} options.text Placeholder text.\n * @param {Boolean} [options.isDirectHost=true] If set `false`, the placeholder will not be enabled directly\n * in the passed `element` but in one of its children (selected automatically, i.e. a first empty child element).\n * Useful when attaching placeholders to elements that can host other elements (not just text), for instance,\n * editable root elements.\n */\nexport function enablePlaceholder( options ) {\n\tconst { view, element, text, isDirectHost = true } = options;\n\tconst doc = view.document;\n\n\t// Use a single a single post fixer per—document to update all placeholders.\n\tif ( !documentPlaceholders.has( doc ) ) {\n\t\tdocumentPlaceholders.set( doc, new Map() );\n\n\t\t// If a post-fixer callback makes a change, it should return `true` so other post–fixers\n\t\t// can re–evaluate the document again.\n\t\tdoc.registerPostFixer( writer => updateDocumentPlaceholders( doc, writer ) );\n\t}\n\n\t// Store information about the element placeholder under its document.\n\tdocumentPlaceholders.get( doc ).set( element, {\n\t\ttext,\n\t\tisDirectHost\n\t} );\n\n\t// Update the placeholders right away.\n\tview.change( writer => updateDocumentPlaceholders( doc, writer ) );\n}\n\n/**\n * Disables the placeholder functionality from a given element.\n *\n * See {@link module:engine/view/placeholder~enablePlaceholder `enablePlaceholder()`} to learn more.\n *\n * @param {module:engine/view/view~View} view\n * @param {module:engine/view/element~Element} element\n */\nexport function disablePlaceholder( view, element ) {\n\tconst doc = element.document;\n\n\tview.change( writer => {\n\t\tif ( !documentPlaceholders.has( doc ) ) {\n\t\t\treturn;\n\t\t}\n\n\t\tconst placeholders = documentPlaceholders.get( doc );\n\t\tconst config = placeholders.get( element );\n\n\t\twriter.removeAttribute( 'data-placeholder', config.hostElement );\n\t\thidePlaceholder( writer, config.hostElement );\n\n\t\tplaceholders.delete( element );\n\t} );\n}\n\n/**\n * Shows a placeholder in the provided element by changing related attributes and CSS classes.\n *\n * **Note**: This helper will not update the placeholder visibility nor manage the\n * it in any way in the future. What it does is a one–time state change of an element. Use\n * {@link module:engine/view/placeholder~enablePlaceholder `enablePlaceholder()`} and\n * {@link module:engine/view/placeholder~disablePlaceholder `disablePlaceholder()`} for full\n * placeholder functionality.\n *\n * **Note**: This helper will blindly show the placeholder directly in the root editable element if\n * one is passed, which could result in a visual clash if the editable element has some children\n * (for instance, an empty paragraph). Use {@link module:engine/view/placeholder~enablePlaceholder `enablePlaceholder()`}\n * in that case or make sure the correct element is passed to the helper.\n *\n * @param {module:engine/view/downcastwriter~DowncastWriter} writer\n * @param {module:engine/view/element~Element} element\n * @returns {Boolean} `true`, if any changes were made to the `element`.\n */\nexport function showPlaceholder( writer, element ) {\n\tif ( !element.hasClass( 'ck-placeholder' ) ) {\n\t\twriter.addClass( 'ck-placeholder', element );\n\n\t\treturn true;\n\t}\n\n\treturn false;\n}\n\n/**\n * Hides a placeholder in the element by changing related attributes and CSS classes.\n *\n * **Note**: This helper will not update the placeholder visibility nor manage the\n * it in any way in the future. What it does is a one–time state change of an element. Use\n * {@link module:engine/view/placeholder~enablePlaceholder `enablePlaceholder()`} and\n * {@link module:engine/view/placeholder~disablePlaceholder `disablePlaceholder()`} for full\n * placeholder functionality.\n *\n * @param {module:engine/view/downcastwriter~DowncastWriter} writer\n * @param {module:engine/view/element~Element} element\n * @returns {Boolean} `true`, if any changes were made to the `element`.\n */\nexport function hidePlaceholder( writer, element ) {\n\tif ( element.hasClass( 'ck-placeholder' ) ) {\n\t\twriter.removeClass( 'ck-placeholder', element );\n\n\t\treturn true;\n\t}\n\n\treturn false;\n}\n\n/**\n * Checks if a placeholder should be displayed in the element.\n *\n * **Note**: This helper will blindly check the possibility of showing a placeholder directly in the\n * root editable element if one is passed, which may not be the expected result. If an element can\n * host other elements (not just text), most likely one of its children should be checked instead\n * because it will be the final host for the placeholder. Use\n * {@link module:engine/view/placeholder~enablePlaceholder `enablePlaceholder()`} in that case or make\n * sure the correct element is passed to the helper.\n *\n * @param {module:engine/view/element~Element} element\n * @returns {Boolean}\n */\nexport function needsPlaceholder( element ) {\n\tif ( !element.isAttached() ) {\n\t\treturn false;\n\t}\n\n\t// The element is empty only as long as it contains nothing but uiElements.\n\tconst isEmptyish = !Array.from( element.getChildren() )\n\t\t.some( element => !element.is( 'uiElement' ) );\n\n\tconst doc = element.document;\n\n\t// If the element is empty and the document is blurred.\n\tif ( !doc.isFocused && isEmptyish ) {\n\t\treturn true;\n\t}\n\n\tconst viewSelection = doc.selection;\n\tconst selectionAnchor = viewSelection.anchor;\n\n\t// If document is focused and the element is empty but the selection is not anchored inside it.\n\tif ( isEmptyish && selectionAnchor && selectionAnchor.parent !== element ) {\n\t\treturn true;\n\t}\n\n\treturn false;\n}\n\n// Updates all placeholders associated with a document in a post–fixer callback.\n//\n// @private\n// @param { module:engine/view/document~Document} doc\n// @param {module:engine/view/downcastwriter~DowncastWriter} writer\n// @returns {Boolean} True if any changes were made to the view document.\nfunction updateDocumentPlaceholders( doc, writer ) {\n\tconst placeholders = documentPlaceholders.get( doc );\n\tlet wasViewModified = false;\n\n\tfor ( const [ element, config ] of placeholders ) {\n\t\tif ( updatePlaceholder( writer, element, config ) ) {\n\t\t\twasViewModified = true;\n\t\t}\n\t}\n\n\treturn wasViewModified;\n}\n\n// Updates a single placeholder in a post–fixer callback.\n//\n// @private\n// @param {module:engine/view/downcastwriter~DowncastWriter} writer\n// @param {module:engine/view/element~Element} element\n// @param {Object} config Configuration of the placeholder\n// @param {String} config.text\n// @param {Boolean} config.isDirectHost\n// @returns {Boolean} True if any changes were made to the view document.\nfunction updatePlaceholder( writer, element, config ) {\n\tconst { text, isDirectHost } = config;\n\n\tconst hostElement = isDirectHost ? element : getChildPlaceholderHostSubstitute( element );\n\tlet wasViewModified = false;\n\n\t// When not a direct host, it could happen that there is no child element\n\t// capable of displaying a placeholder.\n\tif ( !hostElement ) {\n\t\treturn false;\n\t}\n\n\t// Cache the host element. It will be necessary for disablePlaceholder() to know\n\t// which element should have class and attribute removed because, depending on\n\t// the config.isDirectHost value, it could be the element or one of its descendants.\n\tconfig.hostElement = hostElement;\n\n\t// This may be necessary when updating the placeholder text to something else.\n\tif ( hostElement.getAttribute( 'data-placeholder' ) !== text ) {\n\t\twriter.setAttribute( 'data-placeholder', text, hostElement );\n\t\twasViewModified = true;\n\t}\n\n\tif ( needsPlaceholder( hostElement ) ) {\n\t\tif ( showPlaceholder( writer, hostElement ) ) {\n\t\t\twasViewModified = true;\n\t\t}\n\t} else if ( hidePlaceholder( writer, hostElement ) ) {\n\t\twasViewModified = true;\n\t}\n\n\treturn wasViewModified;\n}\n\n// Gets a child element capable of displaying a placeholder if a parent element can host more\n// than just text (for instance, when it is a root editable element). The child element\n// can then be used in other placeholder helpers as a substitute of its parent.\n//\n// @private\n// @param {module:engine/view/element~Element} parent\n// @returns {module:engine/view/element~Element|null}\nfunction getChildPlaceholderHostSubstitute( parent ) {\n\tif ( parent.childCount === 1 ) {\n\t\tconst firstChild = parent.getChild( 0 );\n\n\t\tif ( firstChild.is( 'element' ) && !firstChild.is( 'uiElement' ) ) {\n\t\t\treturn firstChild;\n\t\t}\n\t}\n\n\treturn null;\n}\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module utils/elementreplacer\n */\n\n/**\n * Utility class allowing to hide existing HTML elements or replace them with given ones in a way that doesn't remove\n * the original elements from the DOM.\n */\nexport default class ElementReplacer {\n\tconstructor() {\n\t\t/**\n\t\t * The elements replaced by {@link #replace} and their replacements.\n\t\t *\n\t\t * @private\n\t\t * @member {Array.<Object>}\n\t\t */\n\t\tthis._replacedElements = [];\n\t}\n\n\t/**\n\t * Hides the `element` and, if specified, inserts the the given element next to it.\n\t *\n\t * The effect of this method can be reverted by {@link #restore}.\n\t *\n\t * @param {HTMLElement} element The element to replace.\n\t * @param {HTMLElement} [newElement] The replacement element. If not passed, then the `element` will just be hidden.\n\t */\n\treplace( element, newElement ) {\n\t\tthis._replacedElements.push( { element, newElement } );\n\n\t\telement.style.display = 'none';\n\n\t\tif ( newElement ) {\n\t\t\telement.parentNode.insertBefore( newElement, element.nextSibling );\n\t\t}\n\t}\n\n\t/**\n\t * Restores what {@link #replace} did.\n\t */\n\trestore() {\n\t\tthis._replacedElements.forEach( ( { element, newElement } ) => {\n\t\t\telement.style.display = '';\n\n\t\t\tif ( newElement ) {\n\t\t\t\tnewElement.remove();\n\t\t\t}\n\t\t} );\n\n\t\tthis._replacedElements = [];\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module editor-classic/classiceditorui\n */\n\nimport EditorUI from '@ckeditor/ckeditor5-core/src/editor/editorui';\nimport enableToolbarKeyboardFocus from '@ckeditor/ckeditor5-ui/src/toolbar/enabletoolbarkeyboardfocus';\nimport normalizeToolbarConfig from '@ckeditor/ckeditor5-ui/src/toolbar/normalizetoolbarconfig';\nimport { enablePlaceholder } from '@ckeditor/ckeditor5-engine/src/view/placeholder';\nimport ElementReplacer from '@ckeditor/ckeditor5-utils/src/elementreplacer';\n\n/**\n * The classic editor UI class.\n *\n * @extends module:core/editor/editorui~EditorUI\n */\nexport default class ClassicEditorUI extends EditorUI {\n\t/**\n\t * Creates an instance of the classic editor UI class.\n\t *\n\t * @param {module:core/editor/editor~Editor} editor The editor instance.\n\t * @param {module:ui/editorui/editoruiview~EditorUIView} view The view of the UI.\n\t */\n\tconstructor( editor, view ) {\n\t\tsuper( editor );\n\n\t\t/**\n\t\t * The main (top–most) view of the editor UI.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:ui/editorui/editoruiview~EditorUIView} #view\n\t\t */\n\t\tthis.view = view;\n\n\t\t/**\n\t\t * A normalized `config.toolbar` object.\n\t\t *\n\t\t * @private\n\t\t * @member {Object}\n\t\t */\n\t\tthis._toolbarConfig = normalizeToolbarConfig( editor.config.get( 'toolbar' ) );\n\n\t\t/**\n\t\t * The element replacer instance used to hide the editor's source element.\n\t\t *\n\t\t * @protected\n\t\t * @member {module:utils/elementreplacer~ElementReplacer}\n\t\t */\n\t\tthis._elementReplacer = new ElementReplacer();\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tget element() {\n\t\treturn this.view.element;\n\t}\n\n\t/**\n\t * Initializes the UI.\n\t *\n\t * @param {HTMLElement|null} replacementElement The DOM element that will be the source for the created editor.\n\t */\n\tinit( replacementElement ) {\n\t\tconst editor = this.editor;\n\t\tconst view = this.view;\n\t\tconst editingView = editor.editing.view;\n\t\tconst editable = view.editable;\n\t\tconst editingRoot = editingView.document.getRoot();\n\n\t\t// The editable UI and editing root should share the same name. Then name is used\n\t\t// to recognize the particular editable, for instance in ARIA attributes.\n\t\teditable.name = editingRoot.rootName;\n\n\t\tview.render();\n\n\t\t// The editable UI element in DOM is available for sure only after the editor UI view has been rendered.\n\t\t// But it can be available earlier if a DOM element has been passed to BalloonEditor.create().\n\t\tconst editableElement = editable.element;\n\n\t\t// Register the editable UI view in the editor. A single editor instance can aggregate multiple\n\t\t// editable areas (roots) but the classic editor has only one.\n\t\tthis.setEditableElement( editable.name, editableElement );\n\n\t\t// Let the global focus tracker know that the editable UI element is focusable and\n\t\t// belongs to the editor. From now on, the focus tracker will sustain the editor focus\n\t\t// as long as the editable is focused (e.g. the user is typing).\n\t\tthis.focusTracker.add( editableElement );\n\n\t\t// Let the editable UI element respond to the changes in the global editor focus\n\t\t// tracker. It has been added to the same tracker a few lines above but, in reality, there are\n\t\t// many focusable areas in the editor, like balloons, toolbars or dropdowns and as long\n\t\t// as they have focus, the editable should act like it is focused too (although technically\n\t\t// it isn't), e.g. by setting the proper CSS class, visually announcing focus to the user.\n\t\t// Doing otherwise will result in editable focus styles disappearing, once e.g. the\n\t\t// toolbar gets focused.\n\t\tview.editable.bind( 'isFocused' ).to( this.focusTracker );\n\n\t\t// Bind the editable UI element to the editing view, making it an end– and entry–point\n\t\t// of the editor's engine. This is where the engine meets the UI.\n\t\teditingView.attachDomRoot( editableElement );\n\n\t\t// If an element containing the initial data of the editor was provided, replace it with\n\t\t// an editor instance's UI in DOM until the editor is destroyed. For instance, a <textarea>\n\t\t// can be such element.\n\t\tif ( replacementElement ) {\n\t\t\tthis._elementReplacer.replace( replacementElement, this.element );\n\t\t}\n\n\t\tthis._initPlaceholder();\n\t\tthis._initToolbar();\n\t\tthis.fire( 'ready' );\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tdestroy() {\n\t\tconst view = this.view;\n\t\tconst editingView = this.editor.editing.view;\n\n\t\tthis._elementReplacer.restore();\n\t\teditingView.detachDomRoot( view.editable.name );\n\t\tview.destroy();\n\n\t\tsuper.destroy();\n\t}\n\n\t/**\n\t * Initializes the editor toolbar.\n\t *\n\t * @private\n\t */\n\t_initToolbar() {\n\t\tconst editor = this.editor;\n\t\tconst view = this.view;\n\t\tconst editingView = editor.editing.view;\n\n\t\t// Set–up the sticky panel with toolbar.\n\t\tview.stickyPanel.bind( 'isActive' ).to( this.focusTracker, 'isFocused' );\n\t\tview.stickyPanel.limiterElement = view.element;\n\n\t\tif ( this._toolbarConfig.viewportTopOffset ) {\n\t\t\tview.stickyPanel.viewportTopOffset = this._toolbarConfig.viewportTopOffset;\n\t\t}\n\n\t\tview.toolbar.fillFromConfig( this._toolbarConfig.items, this.componentFactory );\n\n\t\tenableToolbarKeyboardFocus( {\n\t\t\torigin: editingView,\n\t\t\toriginFocusTracker: this.focusTracker,\n\t\t\toriginKeystrokeHandler: editor.keystrokes,\n\t\t\ttoolbar: view.toolbar\n\t\t} );\n\t}\n\n\t/**\n\t * Enable the placeholder text on the editing root, if any was configured.\n\t *\n\t * @private\n\t */\n\t_initPlaceholder() {\n\t\tconst editor = this.editor;\n\t\tconst editingView = editor.editing.view;\n\t\tconst editingRoot = editingView.document.getRoot();\n\t\tconst sourceElement = editor.sourceElement;\n\n\t\tconst placeholderText = editor.config.get( 'placeholder' ) ||\n\t\t\tsourceElement && sourceElement.tagName.toLowerCase() === 'textarea' && sourceElement.getAttribute( 'placeholder' );\n\n\t\tif ( placeholderText ) {\n\t\t\tenablePlaceholder( {\n\t\t\t\tview: editingView,\n\t\t\t\telement: editingRoot,\n\t\t\t\ttext: placeholderText,\n\t\t\t\tisDirectHost: false\n\t\t\t} );\n\t\t}\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module ui/toolbar/normalizetoolbarconfig\n */\n\n/**\n * Normalizes the toolbar configuration (`config.toolbar`), which:\n *\n * * may be defined as an `Array`:\n *\n * \t\ttoolbar: [ 'heading', 'bold', 'italic', 'link', ... ]\n *\n * * or an `Object`:\n *\n *\t\ttoolbar: {\n *\t\t\titems: [ 'heading', 'bold', 'italic', 'link', ... ],\n *\t\t\t...\n *\t\t}\n *\n * * or may not be defined at all (`undefined`)\n *\n * and returns it in the object form.\n *\n * @param {Array|Object|undefined} config The value of `config.toolbar`.\n * @returns {Object} A normalized toolbar config object.\n */\nexport default function normalizeToolbarConfig( config ) {\n\tif ( Array.isArray( config ) ) {\n\t\treturn {\n\t\t\titems: config\n\t\t};\n\t}\n\n\tif ( !config ) {\n\t\treturn {\n\t\t\titems: []\n\t\t};\n\t}\n\n\treturn Object.assign( {\n\t\titems: []\n\t}, config );\n}\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module ui/toolbar/enabletoolbarkeyboardfocus\n */\n\n/**\n * Enables focus/blur toolbar navigation using `Alt+F10` and `Esc` keystrokes.\n *\n * @param {Object} options Options of the utility.\n * @param {*} options.origin A view to which the focus will return when `Esc` is pressed and\n * `options.toolbar` is focused.\n * @param {module:utils/keystrokehandler~KeystrokeHandler} options.originKeystrokeHandler A keystroke\n * handler to register `Alt+F10` keystroke.\n * @param {module:utils/focustracker~FocusTracker} options.originFocusTracker A focus tracker\n * for `options.origin`.\n * @param {module:ui/toolbar/toolbarview~ToolbarView} options.toolbar A toolbar which is to gain\n * focus when `Alt+F10` is pressed.\n * @param {Function} [options.beforeFocus] A callback executed before the `options.toolbar` gains focus\n * upon the `Alt+F10` keystroke.\n * @param {Function} [options.afterBlur] A callback executed after `options.toolbar` loses focus upon\n * `Esc` keystroke but before the focus goes back to `options.origin`.\n */\nexport default function enableToolbarKeyboardFocus( {\n\torigin,\n\toriginKeystrokeHandler,\n\toriginFocusTracker,\n\ttoolbar,\n\tbeforeFocus,\n\tafterBlur\n} ) {\n\t// Because toolbar items can get focus, the overall state of the toolbar must\n\t// also be tracked.\n\toriginFocusTracker.add( toolbar.element );\n\n\t// Focus the toolbar on the keystroke, if not already focused.\n\toriginKeystrokeHandler.set( 'Alt+F10', ( data, cancel ) => {\n\t\tif ( originFocusTracker.isFocused && !toolbar.focusTracker.isFocused ) {\n\t\t\tif ( beforeFocus ) {\n\t\t\t\tbeforeFocus();\n\t\t\t}\n\n\t\t\ttoolbar.focus();\n\n\t\t\tcancel();\n\t\t}\n\t} );\n\n\t// Blur the toolbar and bring the focus back to origin.\n\ttoolbar.keystrokes.set( 'Esc', ( data, cancel ) => {\n\t\tif ( toolbar.focusTracker.isFocused ) {\n\t\t\torigin.focus();\n\n\t\t\tif ( afterBlur ) {\n\t\t\t\tafterBlur();\n\t\t\t}\n\n\t\t\tcancel();\n\t\t}\n\t} );\n}\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module ui/viewcollection\n */\n\nimport CKEditorError from '@ckeditor/ckeditor5-utils/src/ckeditorerror';\nimport Collection from '@ckeditor/ckeditor5-utils/src/collection';\n\n/**\n * Collects {@link module:ui/view~View} instances.\n *\n *\t\tconst parentView = new ParentView( locale );\n *\t\tconst collection = new ViewCollection( locale );\n *\n *\t\tcollection.setParent( parentView.element );\n *\n *\t\tconst viewA = new ChildView( locale );\n *\t\tconst viewB = new ChildView( locale );\n *\n * View collection renders and manages view {@link module:ui/view~View#element elements}:\n *\n *\t\tcollection.add( viewA );\n *\t\tcollection.add( viewB );\n *\n *\t\tconsole.log( parentView.element.firsChild ); // -> viewA.element\n *\t\tconsole.log( parentView.element.lastChild ); // -> viewB.element\n *\n * It {@link module:ui/viewcollection~ViewCollection#delegate propagates} DOM events too:\n *\n *\t\t// Delegate #click and #keydown events from viewA and viewB to the parentView.\n *\t\tcollection.delegate( 'click' ).to( parentView );\n *\n *\t\tparentView.on( 'click', ( evt ) => {\n *\t\t\tconsole.log( `${ evt.source } has been clicked.` );\n *\t\t} );\n *\n *\t\t// This event will be delegated to the parentView.\n *\t\tviewB.fire( 'click' );\n *\n * **Note**: A view collection can be used directly in the {@link module:ui/template~TemplateDefinition definition}\n * of a {@link module:ui/template~Template template}.\n *\n * @extends module:utils/collection~Collection\n * @mixes module:utils/observablemixin~ObservableMixin\n */\nexport default class ViewCollection extends Collection {\n\t/**\n\t * Creates a new instance of the {@link module:ui/viewcollection~ViewCollection}.\n\t *\n\t * @param {Iterable.<module:ui/view~View>} [initialItems] The initial items of the collection.\n\t */\n\tconstructor( initialItems = [] ) {\n\t\tsuper( initialItems, {\n\t\t\t// An #id Number attribute should be legal and not break the `ViewCollection` instance.\n\t\t\t// https://github.com/ckeditor/ckeditor5-ui/issues/93\n\t\t\tidProperty: 'viewUid'\n\t\t} );\n\n\t\t// Handle {@link module:ui/view~View#element} in DOM when a new view is added to the collection.\n\t\tthis.on( 'add', ( evt, view, index ) => {\n\t\t\tthis._renderViewIntoCollectionParent( view, index );\n\t\t} );\n\n\t\t// Handle {@link module:ui/view~View#element} in DOM when a view is removed from the collection.\n\t\tthis.on( 'remove', ( evt, view ) => {\n\t\t\tif ( view.element && this._parentElement ) {\n\t\t\t\tview.element.remove();\n\t\t\t}\n\t\t} );\n\n\t\t/**\n\t\t * A parent element within which child views are rendered and managed in DOM.\n\t\t *\n\t\t * @protected\n\t\t * @member {HTMLElement}\n\t\t */\n\t\tthis._parentElement = null;\n\t}\n\n\t/**\n\t * Destroys the view collection along with child views.\n\t * See the view {@link module:ui/view~View#destroy} method.\n\t */\n\tdestroy() {\n\t\tthis.map( view => view.destroy() );\n\t}\n\n\t/**\n\t * Sets the parent HTML element of this collection. When parent is set, {@link #add adding} and\n\t * {@link #remove removing} views in the collection synchronizes their\n\t * {@link module:ui/view~View#element elements} in the parent element.\n\t *\n\t * @param {HTMLElement} element A new parent element.\n\t */\n\tsetParent( elementOrDocFragment ) {\n\t\tthis._parentElement = elementOrDocFragment;\n\n\t\t// Take care of the initial collection items passed to the constructor.\n\t\tfor ( const view of this ) {\n\t\t\tthis._renderViewIntoCollectionParent( view );\n\t\t}\n\t}\n\n\t/**\n\t * Delegates selected events coming from within views in the collection to any\n\t * {@link module:utils/emittermixin~Emitter}.\n\t *\n\t * For the following views and collection:\n\t *\n\t *\t\tconst viewA = new View();\n\t *\t\tconst viewB = new View();\n\t *\t\tconst viewC = new View();\n\t *\n\t *\t\tconst views = parentView.createCollection();\n\t *\n\t *\t\tviews.delegate( 'eventX' ).to( viewB );\n\t *\t\tviews.delegate( 'eventX', 'eventY' ).to( viewC );\n\t *\n\t *\t\tviews.add( viewA );\n\t *\n\t * the `eventX` is delegated (fired by) `viewB` and `viewC` along with `customData`:\n\t *\n\t *\t\tviewA.fire( 'eventX', customData );\n\t *\n\t * and `eventY` is delegated (fired by) `viewC` along with `customData`:\n\t *\n\t *\t\tviewA.fire( 'eventY', customData );\n\t *\n\t * See {@link module:utils/emittermixin~Emitter#delegate}.\n\t *\n\t * @param {...String} events {@link module:ui/view~View} event names to be delegated to another\n\t * {@link module:utils/emittermixin~Emitter}.\n\t * @returns {Object}\n\t * @returns {Function} return.to A function which accepts the destination of\n\t * {@link module:utils/emittermixin~Emitter#delegate delegated} events.\n\t */\n\tdelegate( ...events ) {\n\t\tif ( !events.length || !isStringArray( events ) ) {\n\t\t\t/**\n\t\t\t * All event names must be strings.\n\t\t\t *\n\t\t\t * @error ui-viewcollection-delegate-wrong-events\n\t\t\t */\n\t\t\tthrow new CKEditorError(\n\t\t\t\t'ui-viewcollection-delegate-wrong-events',\n\t\t\t\tthis\n\t\t\t);\n\t\t}\n\n\t\treturn {\n\t\t\t/**\n\t\t\t * Selects destination for {@link module:utils/emittermixin~Emitter#delegate} events.\n\t\t\t *\n\t\t\t * @memberOf module:ui/viewcollection~ViewCollection#delegate\n\t\t\t * @function module:ui/viewcollection~ViewCollection#delegate.to\n\t\t\t * @param {module:utils/emittermixin~Emitter} dest An `Emitter` instance which is\n\t\t\t * the destination for delegated events.\n\t\t\t */\n\t\t\tto: dest => {\n\t\t\t\t// Activate delegating on existing views in this collection.\n\t\t\t\tfor ( const view of this ) {\n\t\t\t\t\tfor ( const evtName of events ) {\n\t\t\t\t\t\tview.delegate( evtName ).to( dest );\n\t\t\t\t\t}\n\t\t\t\t}\n\n\t\t\t\t// Activate delegating on future views in this collection.\n\t\t\t\tthis.on( 'add', ( evt, view ) => {\n\t\t\t\t\tfor ( const evtName of events ) {\n\t\t\t\t\t\tview.delegate( evtName ).to( dest );\n\t\t\t\t\t}\n\t\t\t\t} );\n\n\t\t\t\t// Deactivate delegating when view is removed from this collection.\n\t\t\t\tthis.on( 'remove', ( evt, view ) => {\n\t\t\t\t\tfor ( const evtName of events ) {\n\t\t\t\t\t\tview.stopDelegating( evtName, dest );\n\t\t\t\t\t}\n\t\t\t\t} );\n\t\t\t}\n\t\t};\n\t}\n\n\t/**\n\t * This method {@link module:ui/view~View#render renders} a new view added to the collection.\n\t *\n\t * If the {@link #_parentElement parent element} of the collection is set, this method also adds\n\t * the view's {@link module:ui/view~View#element} as a child of the parent in DOM at a specified index.\n\t *\n\t * **Note**: If index is not specified, the view's element is pushed as the last child\n\t * of the parent element.\n\t *\n\t * @private\n\t * @param {module:ui/view~View} view A new view added to the collection.\n\t * @param {Number} [index] An index the view holds in the collection. When not specified,\n\t * the view is added at the end.\n\t */\n\t_renderViewIntoCollectionParent( view, index ) {\n\t\tif ( !view.isRendered ) {\n\t\t\tview.render();\n\t\t}\n\n\t\tif ( view.element && this._parentElement ) {\n\t\t\tthis._parentElement.insertBefore( view.element, this._parentElement.children[ index ] );\n\t\t}\n\t}\n\n\t/**\n\t * Removes a child view from the collection. If the {@link #setParent parent element} of the\n\t * collection has been set, the {@link module:ui/view~View#element element} of the view is also removed\n\t * in DOM, reflecting the order of the collection.\n\t *\n\t * See the {@link #add} method.\n\t *\n\t * @method #remove\n\t * @param {module:ui/view~View|Number|String} subject The view to remove, its id or index in the collection.\n\t * @returns {Object} The removed view.\n\t */\n}\n\n// Check if all entries of the array are of `String` type.\n//\n// @private\n// @param {Array} arr An array to be checked.\n// @returns {Boolean}\nfunction isStringArray( arr ) {\n\treturn arr.every( a => typeof a == 'string' );\n}\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module ui/template\n */\n\n/* global document */\n\nimport CKEditorError from '@ckeditor/ckeditor5-utils/src/ckeditorerror';\nimport mix from '@ckeditor/ckeditor5-utils/src/mix';\nimport EmitterMixin from '@ckeditor/ckeditor5-utils/src/emittermixin';\nimport View from './view';\nimport ViewCollection from './viewcollection';\nimport isNode from '@ckeditor/ckeditor5-utils/src/dom/isnode';\nimport { isObject, cloneDeepWith } from 'lodash-es';\nimport toArray from '@ckeditor/ckeditor5-utils/src/toarray';\n\nconst xhtmlNs = 'http://www.w3.org/1999/xhtml';\n\n/**\n * A basic Template class. It renders a DOM HTML element or text from a\n * {@link module:ui/template~TemplateDefinition definition} and supports element attributes, children,\n * bindings to {@link module:utils/observablemixin~Observable observables} and DOM event propagation.\n *\n * A simple template can look like this:\n *\n *\t\tconst bind = Template.bind( observable, emitter );\n *\n *\t\tnew Template( {\n *\t\t\ttag: 'p',\n *\t\t\tattributes: {\n *\t\t\t\tclass: 'foo',\n *\t\t\t\tstyle: {\n *\t\t\t\t\tbackgroundColor: 'yellow'\n *\t\t\t\t}\n *\t\t\t},\n *\t\t\ton: {\n *\t\t\t\tclick: bind.to( 'clicked' )\n *\t\t\t},\n *\t\t\tchildren: [\n *\t\t\t\t'A paragraph.'\n *\t\t\t]\n *\t\t} ).render();\n *\n * and it will render the following HTML element:\n *\n *\t\t<p class=\"foo\" style=\"background-color: yellow;\">A paragraph.</p>\n *\n * Additionally, the `observable` will always fire `clicked` upon clicking `<p>` in the DOM.\n *\n * See {@link module:ui/template~TemplateDefinition} to know more about templates and complex\n * template definitions.\n *\n* @mixes module:utils/emittermixin~EmitterMixin\n */\nexport default class Template {\n\t/**\n\t * Creates an instance of the {@link ~Template} class.\n\t *\n\t * @param {module:ui/template~TemplateDefinition} def The definition of the template.\n\t */\n\tconstructor( def ) {\n\t\tObject.assign( this, normalize( clone( def ) ) );\n\n\t\t/**\n\t\t * Indicates whether this particular Template instance has been\n\t\t * {@link #render rendered}.\n\t\t *\n\t\t * @readonly\n\t\t * @protected\n\t\t * @member {Boolean}\n\t\t */\n\t\tthis._isRendered = false;\n\n\t\t/**\n\t\t * The tag (`tagName`) of this template, e.g. `div`. It also indicates that the template\n\t\t * renders to an HTML element.\n\t\t *\n\t\t * @member {String} #tag\n\t\t */\n\n\t\t/**\n\t\t * The text of the template. It also indicates that the template renders to a DOM text node.\n\t\t *\n\t\t * @member {Array.<String|module:ui/template~TemplateValueSchema>} #text\n\t\t */\n\n\t\t/**\n\t\t * The attributes of the template, e.g. `{ id: [ 'ck-id' ] }`, corresponding with\n\t\t * the attributes of an HTML element.\n\t\t *\n\t\t * **Note**: This property only makes sense when {@link #tag} is defined.\n\t\t *\n\t\t * @member {Object} #attributes\n\t\t */\n\n\t\t/**\n\t\t * The children of the template. They can be either:\n\t\t * * independent instances of {@link ~Template} (sub–templates),\n\t\t * * native DOM Nodes.\n\t\t *\n\t\t * **Note**: This property only makes sense when {@link #tag} is defined.\n\t\t *\n\t\t * @member {Array.<module:ui/template~Template|Node>} #children\n\t\t */\n\n\t\t/**\n\t\t * The DOM event listeners of the template.\n\t\t *\n\t\t * @member {Object} #eventListeners\n\t\t */\n\n\t\t/**\n\t\t * The data used by the {@link #revert} method to restore a node to its original state.\n\t\t *\n\t\t * See: {@link #apply}.\n\t\t *\n\t\t * @readonly\n\t\t * @protected\n\t\t * @member {module:ui/template~RenderData}\n\t\t */\n\t\tthis._revertData = null;\n\t}\n\n\t/**\n\t * Renders a DOM Node (an HTML element or text) out of the template.\n\t *\n\t *\t\tconst domNode = new Template( { ... } ).render();\n\t *\n\t * See: {@link #apply}.\n\t *\n\t * @returns {HTMLElement|Text}\n\t */\n\trender() {\n\t\tconst node = this._renderNode( {\n\t\t\tintoFragment: true\n\t\t} );\n\n\t\tthis._isRendered = true;\n\n\t\treturn node;\n\t}\n\n\t/**\n\t * Applies the template to an existing DOM Node, either HTML element or text.\n\t *\n\t * **Note:** No new DOM nodes will be created. Applying extends:\n\t *\n\t * {@link module:ui/template~TemplateDefinition attributes},\n\t * {@link module:ui/template~TemplateDefinition event listeners}, and\n\t * `textContent` of {@link module:ui/template~TemplateDefinition children} only.\n\t *\n\t * **Note:** Existing `class` and `style` attributes are extended when a template\n\t * is applied to an HTML element, while other attributes and `textContent` are overridden.\n\t *\n\t * **Note:** The process of applying a template can be easily reverted using the\n\t * {@link module:ui/template~Template#revert} method.\n\t *\n\t *\t\tconst element = document.createElement( 'div' );\n\t *\t\tconst observable = new Model( { divClass: 'my-div' } );\n\t *\t\tconst emitter = Object.create( EmitterMixin );\n\t *\t\tconst bind = Template.bind( observable, emitter );\n\t *\n\t *\t\tnew Template( {\n\t *\t\t\tattributes: {\n\t *\t\t\t\tid: 'first-div',\n\t *\t\t\t\tclass: bind.to( 'divClass' )\n\t *\t\t\t},\n\t *\t\t\ton: {\n\t *\t\t\t\tclick: bind( 'elementClicked' ) // Will be fired by the observable.\n\t *\t\t\t},\n\t *\t\t\tchildren: [\n\t *\t\t\t\t'Div text.'\n\t *\t\t\t]\n\t *\t\t} ).apply( element );\n\t *\n\t *\t\tconsole.log( element.outerHTML ); // -> '<div id=\"first-div\" class=\"my-div\"></div>'\n\t *\n\t * @see module:ui/template~Template#render\n\t * @see module:ui/template~Template#revert\n\t * @param {Node} node Root node for the template to apply.\n\t */\n\tapply( node ) {\n\t\tthis._revertData = getEmptyRevertData();\n\n\t\tthis._renderNode( {\n\t\t\tnode,\n\t\t\tisApplying: true,\n\t\t\trevertData: this._revertData\n\t\t} );\n\n\t\treturn node;\n\t}\n\n\t/**\n\t * Reverts a template {@link module:ui/template~Template#apply applied} to a DOM node.\n\t *\n\t * @param {Node} node The root node for the template to revert. In most of the cases, it is the\n\t * same node used by {@link module:ui/template~Template#apply}.\n\t */\n\trevert( node ) {\n\t\tif ( !this._revertData ) {\n\t\t\t/**\n\t\t\t * Attempting to revert a template which has not been applied yet.\n\t\t\t *\n\t\t\t * @error ui-template-revert-not-applied\n\t\t\t */\n\t\t\tthrow new CKEditorError(\n\t\t\t\t'ui-template-revert-not-applied',\n\t\t\t\t[ this, node ]\n\t\t\t);\n\t\t}\n\n\t\tthis._revertTemplateFromNode( node, this._revertData );\n\t}\n\n\t/**\n\t * Returns an iterator which traverses the template in search of {@link module:ui/view~View}\n\t * instances and returns them one by one.\n\t *\n\t *\t\tconst viewFoo = new View();\n\t *\t\tconst viewBar = new View();\n\t *\t\tconst viewBaz = new View();\n\t *\t\tconst template = new Template( {\n\t *\t\t\ttag: 'div',\n\t *\t\t\tchildren: [\n\t *\t\t\t\tviewFoo,\n\t *\t\t\t\t{\n\t *\t\t\t\t\ttag: 'div',\n\t *\t\t\t\t\tchildren: [\n\t *\t\t\t\t\t\tviewBar\n\t *\t\t\t\t\t]\n\t *\t\t\t\t},\n\t *\t\t\t\tviewBaz\n\t *\t\t\t]\n\t *\t\t} );\n\t *\n\t *\t\t// Logs: viewFoo, viewBar, viewBaz\n\t *\t\tfor ( const view of template.getViews() ) {\n\t *\t\t\tconsole.log( view );\n\t *\t\t}\n\t *\n\t * @returns {Iterable.<module:ui/view~View>}\n\t */\n\t* getViews() {\n\t\tfunction* search( def ) {\n\t\t\tif ( def.children ) {\n\t\t\t\tfor ( const child of def.children ) {\n\t\t\t\t\tif ( isView( child ) ) {\n\t\t\t\t\t\tyield child;\n\t\t\t\t\t} else if ( isTemplate( child ) ) {\n\t\t\t\t\t\tyield* search( child );\n\t\t\t\t\t}\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\n\t\tyield* search( this );\n\t}\n\n\t/**\n\t * An entry point to the interface which binds DOM nodes to\n\t * {@link module:utils/observablemixin~Observable observables}.\n\t * There are two types of bindings:\n\t *\n\t * * HTML element attributes or text `textContent` synchronized with attributes of an\n\t * {@link module:utils/observablemixin~Observable}. Learn more about {@link module:ui/template~BindChain#to}\n\t * and {@link module:ui/template~BindChain#if}.\n\t *\n\t *\t\tconst bind = Template.bind( observable, emitter );\n\t *\n\t *\t\tnew Template( {\n\t *\t\t\tattributes: {\n\t *\t\t\t\t// Binds the element \"class\" attribute to observable#classAttribute.\n\t *\t\t\t\tclass: bind.to( 'classAttribute' )\n\t *\t\t\t}\n\t *\t\t} ).render();\n\t *\n\t * * DOM events fired on HTML element propagated through\n\t * {@link module:utils/observablemixin~Observable}. Learn more about {@link module:ui/template~BindChain#to}.\n\t *\n\t *\t\tconst bind = Template.bind( observable, emitter );\n\t *\n\t *\t\tnew Template( {\n\t *\t\t\ton: {\n\t *\t\t\t\t// Will be fired by the observable.\n\t *\t\t\t\tclick: bind( 'elementClicked' )\n\t *\t\t\t}\n\t *\t\t} ).render();\n\t *\n\t * Also see {@link module:ui/view~View#bindTemplate}.\n\t *\n\t * @param {module:utils/observablemixin~Observable} observable An observable which provides boundable attributes.\n\t * @param {module:utils/emittermixin~Emitter} emitter An emitter that listens to observable attribute\n\t * changes or DOM Events (depending on the kind of the binding). Usually, a {@link module:ui/view~View} instance.\n\t * @returns {module:ui/template~BindChain}\n\t */\n\tstatic bind( observable, emitter ) {\n\t\treturn {\n\t\t\tto( eventNameOrFunctionOrAttribute, callback ) {\n\t\t\t\treturn new TemplateToBinding( {\n\t\t\t\t\teventNameOrFunction: eventNameOrFunctionOrAttribute,\n\t\t\t\t\tattribute: eventNameOrFunctionOrAttribute,\n\t\t\t\t\tobservable, emitter, callback\n\t\t\t\t} );\n\t\t\t},\n\n\t\t\tif( attribute, valueIfTrue, callback ) {\n\t\t\t\treturn new TemplateIfBinding( {\n\t\t\t\t\tobservable, emitter, attribute, valueIfTrue, callback\n\t\t\t\t} );\n\t\t\t}\n\t\t};\n\t}\n\n\t/**\n\t * Extends an existing {@link module:ui/template~Template} instance with some additional content\n\t * from another {@link module:ui/template~TemplateDefinition}.\n\t *\n\t *\t\tconst bind = Template.bind( observable, emitter );\n\t *\n\t *\t\tconst template = new Template( {\n\t *\t\t\ttag: 'p',\n\t *\t\t\tattributes: {\n\t *\t\t\t\tclass: 'a',\n\t *\t\t\t\tdata-x: bind.to( 'foo' )\n\t *\t\t\t},\n\t *\t\t\tchildren: [\n\t *\t\t\t\t{\n\t *\t\t\t\t\ttag: 'span',\n\t *\t\t\t\t\tattributes: {\n\t *\t\t\t\t\t\tclass: 'b'\n\t *\t\t\t\t\t},\n\t *\t\t\t\t\tchildren: [\n\t *\t\t\t\t\t\t'Span'\n\t *\t\t\t\t\t]\n\t *\t\t\t\t}\n\t *\t\t\t]\n\t *\t\t } );\n\t *\n\t *\t\t// Instance-level extension.\n\t *\t\tTemplate.extend( template, {\n\t *\t\t\tattributes: {\n\t *\t\t\t\tclass: 'b',\n\t *\t\t\t\tdata-x: bind.to( 'bar' )\n\t *\t\t\t},\n\t *\t\t\tchildren: [\n\t *\t\t\t\t{\n\t *\t\t\t\t\tattributes: {\n\t *\t\t\t\t\t\tclass: 'c'\n\t *\t\t\t\t\t}\n\t *\t\t\t\t}\n\t *\t\t\t]\n\t *\t\t} );\n\t *\n\t *\t\t// Child extension.\n\t *\t\tTemplate.extend( template.children[ 0 ], {\n\t *\t\t\tattributes: {\n\t *\t\t\t\tclass: 'd'\n\t *\t\t\t}\n\t *\t\t} );\n\t *\n\t * the `outerHTML` of `template.render()` is:\n\t *\n\t *\t\t<p class=\"a b\" data-x=\"{ observable.foo } { observable.bar }\">\n\t *\t\t\t<span class=\"b c d\">Span</span>\n\t *\t\t</p>\n\t *\n\t * @param {module:ui/template~Template} template An existing template instance to be extended.\n\t * @param {module:ui/template~TemplateDefinition} def Additional definition to be applied to a template.\n\t */\n\tstatic extend( template, def ) {\n\t\tif ( template._isRendered ) {\n\t\t\t/**\n\t\t\t * Extending a template after rendering may not work as expected. To make sure\n\t\t\t * the {@link module:ui/template~Template.extend extending} works for an element,\n\t\t\t * make sure it happens before {@link #render} is called.\n\t\t\t *\n\t\t\t * @error template-extend-render\n\t\t\t */\n\t\t\tthrow new CKEditorError(\n\t\t\t\t'template-extend-render',\n\t\t\t\t[ this, template ]\n\t\t\t);\n\t\t}\n\n\t\textendTemplate( template, normalize( clone( def ) ) );\n\t}\n\n\t/**\n\t * Renders a DOM Node (either an HTML element or text) out of the template.\n\t *\n\t * @protected\n\t * @param {module:ui/template~RenderData} data Rendering data.\n\t */\n\t_renderNode( data ) {\n\t\tlet isInvalid;\n\n\t\tif ( data.node ) {\n\t\t\t// When applying, a definition cannot have \"tag\" and \"text\" at the same time.\n\t\t\tisInvalid = this.tag && this.text;\n\t\t} else {\n\t\t\t// When rendering, a definition must have either \"tag\" or \"text\": XOR( this.tag, this.text ).\n\t\t\tisInvalid = this.tag ? this.text : !this.text;\n\t\t}\n\n\t\tif ( isInvalid ) {\n\t\t\t/**\n\t\t\t * Node definition cannot have the \"tag\" and \"text\" properties at the same time.\n\t\t\t * Node definition must have either \"tag\" or \"text\" when rendering a new Node.\n\t\t\t *\n\t\t\t * @error ui-template-wrong-syntax\n\t\t\t */\n\t\t\tthrow new CKEditorError(\n\t\t\t\t'ui-template-wrong-syntax',\n\t\t\t\tthis\n\t\t\t);\n\t\t}\n\n\t\tif ( this.text ) {\n\t\t\treturn this._renderText( data );\n\t\t} else {\n\t\t\treturn this._renderElement( data );\n\t\t}\n\t}\n\n\t/**\n\t * Renders an HTML element out of the template.\n\t *\n\t * @protected\n\t * @param {module:ui/template~RenderData} data Rendering data.\n\t */\n\t_renderElement( data ) {\n\t\tlet node = data.node;\n\n\t\tif ( !node ) {\n\t\t\tnode = data.node = document.createElementNS( this.ns || xhtmlNs, this.tag );\n\t\t}\n\n\t\tthis._renderAttributes( data );\n\t\tthis._renderElementChildren( data );\n\t\tthis._setUpListeners( data );\n\n\t\treturn node;\n\t}\n\n\t/**\n\t * Renders a text node out of {@link module:ui/template~Template#text}.\n\t *\n\t * @protected\n\t * @param {module:ui/template~RenderData} data Rendering data.\n\t */\n\t_renderText( data ) {\n\t\tlet node = data.node;\n\n\t\t// Save the original textContent to revert it in #revert().\n\t\tif ( node ) {\n\t\t\tdata.revertData.text = node.textContent;\n\t\t} else {\n\t\t\tnode = data.node = document.createTextNode( '' );\n\t\t}\n\n\t\t// Check if this Text Node is bound to Observable. Cases:\n\t\t//\n\t\t//\t\ttext: [ Template.bind( ... ).to( ... ) ]\n\t\t//\n\t\t//\t\ttext: [\n\t\t//\t\t\t'foo',\n\t\t//\t\t\tTemplate.bind( ... ).to( ... ),\n\t\t//\t\t\t...\n\t\t//\t\t]\n\t\t//\n\t\tif ( hasTemplateBinding( this.text ) ) {\n\t\t\tthis._bindToObservable( {\n\t\t\t\tschema: this.text,\n\t\t\t\tupdater: getTextUpdater( node ),\n\t\t\t\tdata\n\t\t\t} );\n\t\t}\n\t\t// Simply set text. Cases:\n\t\t//\n\t\t//\t\ttext: [ 'all', 'are', 'static' ]\n\t\t//\n\t\t//\t\ttext: [ 'foo' ]\n\t\t//\n\t\telse {\n\t\t\tnode.textContent = this.text.join( '' );\n\t\t}\n\n\t\treturn node;\n\t}\n\n\t/**\n\t * Renders HTML element attributes out of {@link module:ui/template~Template#attributes}.\n\t *\n\t * @protected\n\t * @param {module:ui/template~RenderData} data Rendering data.\n\t */\n\t_renderAttributes( data ) {\n\t\tlet attrName, attrValue, domAttrValue, attrNs;\n\n\t\tif ( !this.attributes ) {\n\t\t\treturn;\n\t\t}\n\n\t\tconst node = data.node;\n\t\tconst revertData = data.revertData;\n\n\t\tfor ( attrName in this.attributes ) {\n\t\t\t// Current attribute value in DOM.\n\t\t\tdomAttrValue = node.getAttribute( attrName );\n\n\t\t\t// The value to be set.\n\t\t\tattrValue = this.attributes[ attrName ];\n\n\t\t\t// Save revert data.\n\t\t\tif ( revertData ) {\n\t\t\t\trevertData.attributes[ attrName ] = domAttrValue;\n\t\t\t}\n\n\t\t\t// Detect custom namespace:\n\t\t\t//\n\t\t\t//\t\tclass: {\n\t\t\t//\t\t\tns: 'abc',\n\t\t\t//\t\t\tvalue: Template.bind( ... ).to( ... )\n\t\t\t//\t\t}\n\t\t\t//\n\t\t\tattrNs = ( isObject( attrValue[ 0 ] ) && attrValue[ 0 ].ns ) ? attrValue[ 0 ].ns : null;\n\n\t\t\t// Activate binding if one is found. Cases:\n\t\t\t//\n\t\t\t//\t\tclass: [\n\t\t\t//\t\t\tTemplate.bind( ... ).to( ... )\n\t\t\t//\t\t]\n\t\t\t//\n\t\t\t//\t\tclass: [\n\t\t\t//\t\t\t'bar',\n\t\t\t//\t\t\tTemplate.bind( ... ).to( ... ),\n\t\t\t//\t\t\t'baz'\n\t\t\t//\t\t]\n\t\t\t//\n\t\t\t//\t\tclass: {\n\t\t\t//\t\t\tns: 'abc',\n\t\t\t//\t\t\tvalue: Template.bind( ... ).to( ... )\n\t\t\t//\t\t}\n\t\t\t//\n\t\t\tif ( hasTemplateBinding( attrValue ) ) {\n\t\t\t\t// Normalize attributes with additional data like namespace:\n\t\t\t\t//\n\t\t\t\t//\t\tclass: {\n\t\t\t\t//\t\t\tns: 'abc',\n\t\t\t\t//\t\t\tvalue: [ ... ]\n\t\t\t\t//\t\t}\n\t\t\t\t//\n\t\t\t\tconst valueToBind = attrNs ? attrValue[ 0 ].value : attrValue;\n\n\t\t\t\t// Extend the original value of attributes like \"style\" and \"class\",\n\t\t\t\t// don't override them.\n\t\t\t\tif ( revertData && shouldExtend( attrName ) ) {\n\t\t\t\t\tvalueToBind.unshift( domAttrValue );\n\t\t\t\t}\n\n\t\t\t\tthis._bindToObservable( {\n\t\t\t\t\tschema: valueToBind,\n\t\t\t\t\tupdater: getAttributeUpdater( node, attrName, attrNs ),\n\t\t\t\t\tdata\n\t\t\t\t} );\n\t\t\t}\n\n\t\t\t// Style attribute could be an Object so it needs to be parsed in a specific way.\n\t\t\t//\n\t\t\t//\t\tstyle: {\n\t\t\t//\t\t\twidth: '100px',\n\t\t\t//\t\t\theight: Template.bind( ... ).to( ... )\n\t\t\t//\t\t}\n\t\t\t//\n\t\t\telse if ( attrName == 'style' && typeof attrValue[ 0 ] !== 'string' ) {\n\t\t\t\tthis._renderStyleAttribute( attrValue[ 0 ], data );\n\t\t\t}\n\n\t\t\t// Otherwise simply set the static attribute:\n\t\t\t//\n\t\t\t//\t\tclass: [ 'foo' ]\n\t\t\t//\n\t\t\t//\t\tclass: [ 'all', 'are', 'static' ]\n\t\t\t//\n\t\t\t//\t\tclass: [\n\t\t\t//\t\t\t{\n\t\t\t//\t\t\t\tns: 'abc',\n\t\t\t//\t\t\t\tvalue: [ 'foo' ]\n\t\t\t//\t\t\t}\n\t\t\t//\t\t]\n\t\t\t//\n\t\t\telse {\n\t\t\t\t// Extend the original value of attributes like \"style\" and \"class\",\n\t\t\t\t// don't override them.\n\t\t\t\tif ( revertData && domAttrValue && shouldExtend( attrName ) ) {\n\t\t\t\t\tattrValue.unshift( domAttrValue );\n\t\t\t\t}\n\n\t\t\t\tattrValue = attrValue\n\t\t\t\t\t// Retrieve \"values\" from:\n\t\t\t\t\t//\n\t\t\t\t\t//\t\tclass: [\n\t\t\t\t\t//\t\t\t{\n\t\t\t\t\t//\t\t\t\tns: 'abc',\n\t\t\t\t\t//\t\t\t\tvalue: [ ... ]\n\t\t\t\t\t//\t\t\t}\n\t\t\t\t\t//\t\t]\n\t\t\t\t\t//\n\t\t\t\t\t.map( val => val ? ( val.value || val ) : val )\n\t\t\t\t\t// Flatten the array.\n\t\t\t\t\t.reduce( ( prev, next ) => prev.concat( next ), [] )\n\t\t\t\t\t// Convert into string.\n\t\t\t\t\t.reduce( arrayValueReducer, '' );\n\n\t\t\t\tif ( !isFalsy( attrValue ) ) {\n\t\t\t\t\tnode.setAttributeNS( attrNs, attrName, attrValue );\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\t}\n\n\t/**\n\t * Renders the `style` attribute of an HTML element based on\n\t * {@link module:ui/template~Template#attributes}.\n\t *\n\t * A style attribute is an {Object} with static values:\n\t *\n\t *\t\tattributes: {\n\t *\t\t\tstyle: {\n\t *\t\t\t\tcolor: 'red'\n\t *\t\t\t}\n\t *\t\t}\n\t *\n\t * or values bound to {@link module:ui/model~Model} properties:\n\t *\n\t *\t\tattributes: {\n\t *\t\t\tstyle: {\n\t *\t\t\t\tcolor: bind.to( ... )\n\t *\t\t\t}\n\t *\t\t}\n\t *\n\t * Note: The `style` attribute is rendered without setting the namespace. It does not seem to be\n\t * needed.\n\t *\n\t * @private\n\t * @param {Object} styles Styles located in `attributes.style` of {@link module:ui/template~TemplateDefinition}.\n\t * @param {module:ui/template~RenderData} data Rendering data.\n\t */\n\t_renderStyleAttribute( styles, data ) {\n\t\tconst node = data.node;\n\n\t\tfor ( const styleName in styles ) {\n\t\t\tconst styleValue = styles[ styleName ];\n\n\t\t\t// Cases:\n\t\t\t//\n\t\t\t//\t\tstyle: {\n\t\t\t//\t\t\tcolor: bind.to( 'attribute' )\n\t\t\t//\t\t}\n\t\t\t//\n\t\t\tif ( hasTemplateBinding( styleValue ) ) {\n\t\t\t\tthis._bindToObservable( {\n\t\t\t\t\tschema: [ styleValue ],\n\t\t\t\t\tupdater: getStyleUpdater( node, styleName ),\n\t\t\t\t\tdata\n\t\t\t\t} );\n\t\t\t}\n\n\t\t\t// Cases:\n\t\t\t//\n\t\t\t//\t\tstyle: {\n\t\t\t//\t\t\tcolor: 'red'\n\t\t\t//\t\t}\n\t\t\t//\n\t\t\telse {\n\t\t\t\tnode.style[ styleName ] = styleValue;\n\t\t\t}\n\t\t}\n\t}\n\n\t/**\n\t * Recursively renders HTML element's children from {@link module:ui/template~Template#children}.\n\t *\n\t * @protected\n\t * @param {module:ui/template~RenderData} data Rendering data.\n\t */\n\t_renderElementChildren( data ) {\n\t\tconst node = data.node;\n\t\tconst container = data.intoFragment ? document.createDocumentFragment() : node;\n\t\tconst isApplying = data.isApplying;\n\t\tlet childIndex = 0;\n\n\t\tfor ( const child of this.children ) {\n\t\t\tif ( isViewCollection( child ) ) {\n\t\t\t\tif ( !isApplying ) {\n\t\t\t\t\tchild.setParent( node );\n\n\t\t\t\t\t// Note: ViewCollection renders its children.\n\t\t\t\t\tfor ( const view of child ) {\n\t\t\t\t\t\tcontainer.appendChild( view.element );\n\t\t\t\t\t}\n\t\t\t\t}\n\t\t\t} else if ( isView( child ) ) {\n\t\t\t\tif ( !isApplying ) {\n\t\t\t\t\tif ( !child.isRendered ) {\n\t\t\t\t\t\tchild.render();\n\t\t\t\t\t}\n\n\t\t\t\t\tcontainer.appendChild( child.element );\n\t\t\t\t}\n\t\t\t} else if ( isNode( child ) ) {\n\t\t\t\tcontainer.appendChild( child );\n\t\t\t} else {\n\t\t\t\tif ( isApplying ) {\n\t\t\t\t\tconst revertData = data.revertData;\n\t\t\t\t\tconst childRevertData = getEmptyRevertData();\n\n\t\t\t\t\trevertData.children.push( childRevertData );\n\n\t\t\t\t\tchild._renderNode( {\n\t\t\t\t\t\tnode: container.childNodes[ childIndex++ ],\n\t\t\t\t\t\tisApplying: true,\n\t\t\t\t\t\trevertData: childRevertData\n\t\t\t\t\t} );\n\t\t\t\t} else {\n\t\t\t\t\tcontainer.appendChild( child.render() );\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\n\t\tif ( data.intoFragment ) {\n\t\t\tnode.appendChild( container );\n\t\t}\n\t}\n\n\t/**\n\t * Activates `on` event listeners from the {@link module:ui/template~TemplateDefinition}\n\t * on an HTML element.\n\t *\n\t * @protected\n\t * @param {module:ui/template~RenderData} data Rendering data.\n\t */\n\t_setUpListeners( data ) {\n\t\tif ( !this.eventListeners ) {\n\t\t\treturn;\n\t\t}\n\n\t\tfor ( const key in this.eventListeners ) {\n\t\t\tconst revertBindings = this.eventListeners[ key ].map( schemaItem => {\n\t\t\t\tconst [ domEvtName, domSelector ] = key.split( '@' );\n\n\t\t\t\treturn schemaItem.activateDomEventListener( domEvtName, domSelector, data );\n\t\t\t} );\n\n\t\t\tif ( data.revertData ) {\n\t\t\t\tdata.revertData.bindings.push( revertBindings );\n\t\t\t}\n\t\t}\n\t}\n\n\t/**\n\t * For a given {@link module:ui/template~TemplateValueSchema} containing {@link module:ui/template~TemplateBinding}\n\t * activates the binding and sets its initial value.\n\t *\n\t * Note: {@link module:ui/template~TemplateValueSchema} can be for HTML element attributes or\n\t * text node `textContent`.\n\t *\n\t * @protected\n\t * @param {Object} options Binding options.\n\t * @param {module:ui/template~TemplateValueSchema} options.schema\n\t * @param {Function} options.updater A function which updates the DOM (like attribute or text).\n\t * @param {module:ui/template~RenderData} options.data Rendering data.\n\t */\n\t_bindToObservable( { schema, updater, data } ) {\n\t\tconst revertData = data.revertData;\n\n\t\t// Set initial values.\n\t\tsyncValueSchemaValue( schema, updater, data );\n\n\t\tconst revertBindings = schema\n\t\t\t// Filter \"falsy\" (false, undefined, null, '') value schema components out.\n\t\t\t.filter( item => !isFalsy( item ) )\n\t\t\t// Filter inactive bindings from schema, like static strings ('foo'), numbers (42), etc.\n\t\t\t.filter( item => item.observable )\n\t\t\t// Once only the actual binding are left, let the emitter listen to observable change:attribute event.\n\t\t\t// TODO: Reduce the number of listeners attached as many bindings may listen\n\t\t\t// to the same observable attribute.\n\t\t\t.map( templateBinding => templateBinding.activateAttributeListener( schema, updater, data ) );\n\n\t\tif ( revertData ) {\n\t\t\trevertData.bindings.push( revertBindings );\n\t\t}\n\t}\n\n\t/**\n\t * Reverts {@link module:ui/template~RenderData#revertData template data} from a node to\n\t * return it to the original state.\n\t *\n\t * @protected\n\t * @param {HTMLElement|Text} node A node to be reverted.\n\t * @param {Object} revertData An object that stores information about what changes have been made by\n\t * {@link #apply} to the node. See {@link module:ui/template~RenderData#revertData} for more information.\n\t */\n\t_revertTemplateFromNode( node, revertData ) {\n\t\tfor ( const binding of revertData.bindings ) {\n\t\t\t// Each binding may consist of several observable+observable#attribute.\n\t\t\t// like the following has 2:\n\t\t\t//\n\t\t\t//\t\tclass: [\n\t\t\t//\t\t\t'x',\n\t\t\t//\t\t\tbind.to( 'foo' ),\n\t\t\t//\t\t\t'y',\n\t\t\t//\t\t\tbind.to( 'bar' )\n\t\t\t//\t\t]\n\t\t\t//\n\t\t\tfor ( const revertBinding of binding ) {\n\t\t\t\trevertBinding();\n\t\t\t}\n\t\t}\n\n\t\tif ( revertData.text ) {\n\t\t\tnode.textContent = revertData.text;\n\n\t\t\treturn;\n\t\t}\n\n\t\tfor ( const attrName in revertData.attributes ) {\n\t\t\tconst attrValue = revertData.attributes[ attrName ];\n\n\t\t\t// When the attribute has **not** been set before #apply().\n\t\t\tif ( attrValue === null ) {\n\t\t\t\tnode.removeAttribute( attrName );\n\t\t\t} else {\n\t\t\t\tnode.setAttribute( attrName, attrValue );\n\t\t\t}\n\t\t}\n\n\t\tfor ( let i = 0; i < revertData.children.length; ++i ) {\n\t\t\tthis._revertTemplateFromNode( node.childNodes[ i ], revertData.children[ i ] );\n\t\t}\n\t}\n}\n\nmix( Template, EmitterMixin );\n\n/**\n * Describes a binding created by the {@link module:ui/template~Template.bind} interface.\n *\n * @protected\n */\nexport class TemplateBinding {\n\t/**\n\t * Creates an instance of the {@link module:ui/template~TemplateBinding} class.\n\t *\n\t * @param {module:ui/template~TemplateDefinition} def The definition of the binding.\n\t */\n\tconstructor( def ) {\n\t\tObject.assign( this, def );\n\n\t\t/**\n\t\t * An observable instance of the binding. It either:\n\t\t *\n\t\t * * provides the attribute with the value,\n\t\t * * or passes the event when a corresponding DOM event is fired.\n\t\t *\n\t\t * @member {module:utils/observablemixin~ObservableMixin} module:ui/template~TemplateBinding#observable\n\t\t */\n\n\t\t/**\n\t\t * An {@link module:utils/emittermixin~Emitter} used by the binding to:\n\t\t *\n\t\t * * listen to the attribute change in the {@link module:ui/template~TemplateBinding#observable},\n\t\t * * or listen to the event in the DOM.\n\t\t *\n\t\t * @member {module:utils/emittermixin~EmitterMixin} module:ui/template~TemplateBinding#emitter\n\t\t */\n\n\t\t/**\n\t\t * The name of the {@link module:ui/template~TemplateBinding#observable observed attribute}.\n\t\t *\n\t\t * @member {String} module:ui/template~TemplateBinding#attribute\n\t\t */\n\n\t\t/**\n\t\t * A custom function to process the value of the {@link module:ui/template~TemplateBinding#attribute}.\n\t\t *\n\t\t * @member {Function} [module:ui/template~TemplateBinding#callback]\n\t\t */\n\t}\n\n\t/**\n\t * Returns the value of the binding. It is the value of the {@link module:ui/template~TemplateBinding#attribute} in\n\t * {@link module:ui/template~TemplateBinding#observable}. The value may be processed by the\n\t * {@link module:ui/template~TemplateBinding#callback}, if such has been passed to the binding.\n\t *\n\t * @param {Node} [node] A native DOM node, passed to the custom {@link module:ui/template~TemplateBinding#callback}.\n\t * @returns {*} The value of {@link module:ui/template~TemplateBinding#attribute} in\n\t * {@link module:ui/template~TemplateBinding#observable}.\n\t */\n\tgetValue( node ) {\n\t\tconst value = this.observable[ this.attribute ];\n\n\t\treturn this.callback ? this.callback( value, node ) : value;\n\t}\n\n\t/**\n\t * Activates the listener which waits for changes of the {@link module:ui/template~TemplateBinding#attribute} in\n\t * {@link module:ui/template~TemplateBinding#observable}, then updates the DOM with the aggregated\n\t * value of {@link module:ui/template~TemplateValueSchema}.\n\t *\n\t * @param {module:ui/template~TemplateValueSchema} schema A full schema to generate an attribute or text in the DOM.\n\t * @param {Function} updater A DOM updater function used to update the native DOM attribute or text.\n\t * @param {module:ui/template~RenderData} data Rendering data.\n\t * @returns {Function} A function to sever the listener binding.\n\t */\n\tactivateAttributeListener( schema, updater, data ) {\n\t\tconst callback = () => syncValueSchemaValue( schema, updater, data );\n\n\t\tthis.emitter.listenTo( this.observable, 'change:' + this.attribute, callback );\n\n\t\t// Allows revert of the listener.\n\t\treturn () => {\n\t\t\tthis.emitter.stopListening( this.observable, 'change:' + this.attribute, callback );\n\t\t};\n\t}\n}\n\n/**\n * Describes either:\n *\n * * a binding to an {@link module:utils/observablemixin~Observable},\n * * or a native DOM event binding.\n *\n * It is created by the {@link module:ui/template~BindChain#to} method.\n *\n * @protected\n */\nexport class TemplateToBinding extends TemplateBinding {\n\t/**\n\t * Activates the listener for the native DOM event, which when fired, is propagated by\n\t * the {@link module:ui/template~TemplateBinding#emitter}.\n\t *\n\t * @param {String} domEvtName The name of the native DOM event.\n\t * @param {String} domSelector The selector in the DOM to filter delegated events.\n\t * @param {module:ui/template~RenderData} data Rendering data.\n\t * @returns {Function} A function to sever the listener binding.\n\t */\n\tactivateDomEventListener( domEvtName, domSelector, data ) {\n\t\tconst callback = ( evt, domEvt ) => {\n\t\t\tif ( !domSelector || domEvt.target.matches( domSelector ) ) {\n\t\t\t\tif ( typeof this.eventNameOrFunction == 'function' ) {\n\t\t\t\t\tthis.eventNameOrFunction( domEvt );\n\t\t\t\t} else {\n\t\t\t\t\tthis.observable.fire( this.eventNameOrFunction, domEvt );\n\t\t\t\t}\n\t\t\t}\n\t\t};\n\n\t\tthis.emitter.listenTo( data.node, domEvtName, callback );\n\n\t\t// Allows revert of the listener.\n\t\treturn () => {\n\t\t\tthis.emitter.stopListening( data.node, domEvtName, callback );\n\t\t};\n\t}\n}\n\n/**\n * Describes a binding to {@link module:utils/observablemixin~ObservableMixin} created by the {@link module:ui/template~BindChain#if}\n * method.\n *\n * @protected\n */\nexport class TemplateIfBinding extends TemplateBinding {\n\t/**\n\t * @inheritDoc\n\t */\n\tgetValue( node ) {\n\t\tconst value = super.getValue( node );\n\n\t\treturn isFalsy( value ) ? false : ( this.valueIfTrue || true );\n\t}\n\n\t/**\n\t * The value of the DOM attribute or text to be set if the {@link module:ui/template~TemplateBinding#attribute} in\n\t * {@link module:ui/template~TemplateBinding#observable} is `true`.\n\t *\n\t * @member {String} [module:ui/template~TemplateIfBinding#valueIfTrue]\n\t */\n}\n\n// Checks whether given {@link module:ui/template~TemplateValueSchema} contains a\n// {@link module:ui/template~TemplateBinding}.\n//\n// @param {module:ui/template~TemplateValueSchema} schema\n// @returns {Boolean}\nfunction hasTemplateBinding( schema ) {\n\tif ( !schema ) {\n\t\treturn false;\n\t}\n\n\t// Normalize attributes with additional data like namespace:\n\t//\n\t//\t\tclass: {\n\t//\t\t\tns: 'abc',\n\t//\t\t\tvalue: [ ... ]\n\t//\t\t}\n\t//\n\tif ( schema.value ) {\n\t\tschema = schema.value;\n\t}\n\n\tif ( Array.isArray( schema ) ) {\n\t\treturn schema.some( hasTemplateBinding );\n\t} else if ( schema instanceof TemplateBinding ) {\n\t\treturn true;\n\t}\n\n\treturn false;\n}\n\n// Assembles the value using {@link module:ui/template~TemplateValueSchema} and stores it in a form of\n// an Array. Each entry of the Array corresponds to one of {@link module:ui/template~TemplateValueSchema}\n// items.\n//\n// @param {module:ui/template~TemplateValueSchema} schema\n// @param {Node} node DOM Node updated when {@link module:utils/observablemixin~ObservableMixin} changes.\n// @returns {Array}\nfunction getValueSchemaValue( schema, node ) {\n\treturn schema.map( schemaItem => {\n\t\t// Process {@link module:ui/template~TemplateBinding} bindings.\n\t\tif ( schemaItem instanceof TemplateBinding ) {\n\t\t\treturn schemaItem.getValue( node );\n\t\t}\n\n\t\t// All static values like strings, numbers, and \"falsy\" values (false, null, undefined, '', etc.) just pass.\n\t\treturn schemaItem;\n\t} );\n}\n\n// A function executed each time the bound Observable attribute changes, which updates the DOM with a value\n// constructed from {@link module:ui/template~TemplateValueSchema}.\n//\n// @param {module:ui/template~TemplateValueSchema} schema\n// @param {Function} updater A function which updates the DOM (like attribute or text).\n// @param {Node} node DOM Node updated when {@link module:utils/observablemixin~ObservableMixin} changes.\nfunction syncValueSchemaValue( schema, updater, { node } ) {\n\tlet value = getValueSchemaValue( schema, node );\n\n\t// Check if schema is a single Template.bind.if, like:\n\t//\n\t//\t\tclass: Template.bind.if( 'foo' )\n\t//\n\tif ( schema.length == 1 && schema[ 0 ] instanceof TemplateIfBinding ) {\n\t\tvalue = value[ 0 ];\n\t} else {\n\t\tvalue = value.reduce( arrayValueReducer, '' );\n\t}\n\n\tif ( isFalsy( value ) ) {\n\t\tupdater.remove();\n\t} else {\n\t\tupdater.set( value );\n\t}\n}\n\n// Returns an object consisting of `set` and `remove` functions, which\n// can be used in the context of DOM Node to set or reset `textContent`.\n// @see module:ui/view~View#_bindToObservable\n//\n// @param {Node} node DOM Node to be modified.\n// @returns {Object}\nfunction getTextUpdater( node ) {\n\treturn {\n\t\tset( value ) {\n\t\t\tnode.textContent = value;\n\t\t},\n\n\t\tremove() {\n\t\t\tnode.textContent = '';\n\t\t}\n\t};\n}\n\n// Returns an object consisting of `set` and `remove` functions, which\n// can be used in the context of DOM Node to set or reset an attribute.\n// @see module:ui/view~View#_bindToObservable\n//\n// @param {Node} node DOM Node to be modified.\n// @param {String} attrName Name of the attribute to be modified.\n// @param {String} [ns=null] Namespace to use.\n// @returns {Object}\nfunction getAttributeUpdater( el, attrName, ns ) {\n\treturn {\n\t\tset( value ) {\n\t\t\tel.setAttributeNS( ns, attrName, value );\n\t\t},\n\n\t\tremove() {\n\t\t\tel.removeAttributeNS( ns, attrName );\n\t\t}\n\t};\n}\n\n// Returns an object consisting of `set` and `remove` functions, which\n// can be used in the context of CSSStyleDeclaration to set or remove a style.\n// @see module:ui/view~View#_bindToObservable\n//\n// @param {Node} node DOM Node to be modified.\n// @param {String} styleName Name of the style to be modified.\n// @returns {Object}\nfunction getStyleUpdater( el, styleName ) {\n\treturn {\n\t\tset( value ) {\n\t\t\tel.style[ styleName ] = value;\n\t\t},\n\n\t\tremove() {\n\t\t\tel.style[ styleName ] = null;\n\t\t}\n\t};\n}\n\n// Clones definition of the template.\n//\n// @param {module:ui/template~TemplateDefinition} def\n// @returns {module:ui/template~TemplateDefinition}\nfunction clone( def ) {\n\tconst clone = cloneDeepWith( def, value => {\n\t\t// Don't clone the `Template.bind`* bindings because of the references to Observable\n\t\t// and DomEmitterMixin instances inside, which would also be traversed and cloned by greedy\n\t\t// cloneDeepWith algorithm. There's no point in cloning Observable/DomEmitterMixins\n\t\t// along with the definition.\n\t\t//\n\t\t// Don't clone Template instances if provided as a child. They're simply #render()ed\n\t\t// and nothing should interfere.\n\t\t//\n\t\t// Also don't clone View instances if provided as a child of the Template. The template\n\t\t// instance will be extracted from the View during the normalization and there's no need\n\t\t// to clone it.\n\t\tif ( value && ( value instanceof TemplateBinding || isTemplate( value ) || isView( value ) || isViewCollection( value ) ) ) {\n\t\t\treturn value;\n\t\t}\n\t} );\n\n\treturn clone;\n}\n\n// Normalizes given {@link module:ui/template~TemplateDefinition}.\n//\n// See:\n//  * {@link normalizeAttributes}\n//  * {@link normalizeListeners}\n//  * {@link normalizePlainTextDefinition}\n//  * {@link normalizeTextDefinition}\n//\n// @param {module:ui/template~TemplateDefinition} def\n// @returns {module:ui/template~TemplateDefinition} Normalized definition.\nfunction normalize( def ) {\n\tif ( typeof def == 'string' ) {\n\t\tdef = normalizePlainTextDefinition( def );\n\t} else if ( def.text ) {\n\t\tnormalizeTextDefinition( def );\n\t}\n\n\tif ( def.on ) {\n\t\tdef.eventListeners = normalizeListeners( def.on );\n\n\t\t// Template mixes EmitterMixin, so delete #on to avoid collision.\n\t\tdelete def.on;\n\t}\n\n\tif ( !def.text ) {\n\t\tif ( def.attributes ) {\n\t\t\tnormalizeAttributes( def.attributes );\n\t\t}\n\n\t\tconst children = [];\n\n\t\tif ( def.children ) {\n\t\t\tif ( isViewCollection( def.children ) ) {\n\t\t\t\tchildren.push( def.children );\n\t\t\t} else {\n\t\t\t\tfor ( const child of def.children ) {\n\t\t\t\t\tif ( isTemplate( child ) || isView( child ) || isNode( child ) ) {\n\t\t\t\t\t\tchildren.push( child );\n\t\t\t\t\t} else {\n\t\t\t\t\t\tchildren.push( new Template( child ) );\n\t\t\t\t\t}\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\n\t\tdef.children = children;\n\t}\n\n\treturn def;\n}\n\n// Normalizes \"attributes\" section of {@link module:ui/template~TemplateDefinition}.\n//\n//\t\tattributes: {\n//\t\t\ta: 'bar',\n//\t\t\tb: {@link module:ui/template~TemplateBinding},\n//\t\t\tc: {\n//\t\t\t\tvalue: 'bar'\n//\t\t\t}\n//\t\t}\n//\n// becomes\n//\n//\t\tattributes: {\n//\t\t\ta: [ 'bar' ],\n//\t\t\tb: [ {@link module:ui/template~TemplateBinding} ],\n//\t\t\tc: {\n//\t\t\t\tvalue: [ 'bar' ]\n//\t\t\t}\n//\t\t}\n//\n// @param {Object} attributes\nfunction normalizeAttributes( attributes ) {\n\tfor ( const a in attributes ) {\n\t\tif ( attributes[ a ].value ) {\n\t\t\tattributes[ a ].value = toArray( attributes[ a ].value );\n\t\t}\n\n\t\tarrayify( attributes, a );\n\t}\n}\n\n// Normalizes \"on\" section of {@link module:ui/template~TemplateDefinition}.\n//\n//\t\ton: {\n//\t\t\ta: 'bar',\n//\t\t\tb: {@link module:ui/template~TemplateBinding},\n//\t\t\tc: [ {@link module:ui/template~TemplateBinding}, () => { ... } ]\n//\t\t}\n//\n// becomes\n//\n//\t\ton: {\n//\t\t\ta: [ 'bar' ],\n//\t\t\tb: [ {@link module:ui/template~TemplateBinding} ],\n//\t\t\tc: [ {@link module:ui/template~TemplateBinding}, () => { ... } ]\n//\t\t}\n//\n// @param {Object} listeners\n// @returns {Object} Object containing normalized listeners.\nfunction normalizeListeners( listeners ) {\n\tfor ( const l in listeners ) {\n\t\tarrayify( listeners, l );\n\t}\n\n\treturn listeners;\n}\n\n// Normalizes \"string\" {@link module:ui/template~TemplateDefinition}.\n//\n//\t\t\"foo\"\n//\n// becomes\n//\n//\t\t{ text: [ 'foo' ] },\n//\n// @param {String} def\n// @returns {module:ui/template~TemplateDefinition} Normalized template definition.\nfunction normalizePlainTextDefinition( def ) {\n\treturn {\n\t\ttext: [ def ]\n\t};\n}\n\n// Normalizes text {@link module:ui/template~TemplateDefinition}.\n//\n//\t\tchildren: [\n//\t\t\t{ text: 'def' },\n//\t\t\t{ text: {@link module:ui/template~TemplateBinding} }\n//\t\t]\n//\n// becomes\n//\n//\t\tchildren: [\n//\t\t\t{ text: [ 'def' ] },\n//\t\t\t{ text: [ {@link module:ui/template~TemplateBinding} ] }\n//\t\t]\n//\n// @param {module:ui/template~TemplateDefinition} def\nfunction normalizeTextDefinition( def ) {\n\tdef.text = toArray( def.text );\n}\n\n// Wraps an entry in Object in an Array, if not already one.\n//\n//\t\t{\n//\t\t\tx: 'y',\n//\t\t\ta: [ 'b' ]\n//\t\t}\n//\n// becomes\n//\n//\t\t{\n//\t\t\tx: [ 'y' ],\n//\t\t\ta: [ 'b' ]\n//\t\t}\n//\n// @param {Object} obj\n// @param {String} key\nfunction arrayify( obj, key ) {\n\tobj[ key ] = toArray( obj[ key ] );\n}\n\n// A helper which concatenates the value avoiding unwanted\n// leading white spaces.\n//\n// @param {String} prev\n// @param {String} cur\n// @returns {String}\nfunction arrayValueReducer( prev, cur ) {\n\tif ( isFalsy( cur ) ) {\n\t\treturn prev;\n\t} else if ( isFalsy( prev ) ) {\n\t\treturn cur;\n\t} else {\n\t\treturn `${ prev } ${ cur }`;\n\t}\n}\n\n// Extends one object defined in the following format:\n//\n//\t\t{\n//\t\t\tkey1: [Array1],\n//\t\t\tkey2: [Array2],\n//\t\t\t...\n//\t\t\tkeyN: [ArrayN]\n//\t\t}\n//\n// with another object of the same data format.\n//\n// @param {Object} obj Base object.\n// @param {Object} ext Object extending base.\n// @returns {String}\nfunction extendObjectValueArray( obj, ext ) {\n\tfor ( const a in ext ) {\n\t\tif ( obj[ a ] ) {\n\t\t\tobj[ a ].push( ...ext[ a ] );\n\t\t} else {\n\t\t\tobj[ a ] = ext[ a ];\n\t\t}\n\t}\n}\n\n// A helper for {@link module:ui/template~Template#extend}. Recursively extends {@link module:ui/template~Template} instance\n// with content from {@link module:ui/template~TemplateDefinition}. See {@link module:ui/template~Template#extend} to learn more.\n//\n// @param {module:ui/template~Template} def A template instance to be extended.\n// @param {module:ui/template~TemplateDefinition} def A definition which is to extend the template instance.\n// @param {Object} Error context.\nfunction extendTemplate( template, def ) {\n\tif ( def.attributes ) {\n\t\tif ( !template.attributes ) {\n\t\t\ttemplate.attributes = {};\n\t\t}\n\n\t\textendObjectValueArray( template.attributes, def.attributes );\n\t}\n\n\tif ( def.eventListeners ) {\n\t\tif ( !template.eventListeners ) {\n\t\t\ttemplate.eventListeners = {};\n\t\t}\n\n\t\textendObjectValueArray( template.eventListeners, def.eventListeners );\n\t}\n\n\tif ( def.text ) {\n\t\ttemplate.text.push( ...def.text );\n\t}\n\n\tif ( def.children && def.children.length ) {\n\t\tif ( template.children.length != def.children.length ) {\n\t\t\t/**\n\t\t\t * The number of children in extended definition does not match.\n\t\t\t *\n\t\t\t * @error ui-template-extend-children-mismatch\n\t\t\t */\n\t\t\tthrow new CKEditorError(\n\t\t\t\t'ui-template-extend-children-mismatch',\n\t\t\t\ttemplate\n\t\t\t);\n\t\t}\n\n\t\tlet childIndex = 0;\n\n\t\tfor ( const childDef of def.children ) {\n\t\t\textendTemplate( template.children[ childIndex++ ], childDef );\n\t\t}\n\t}\n}\n\n// Checks if value is \"falsy\".\n// Note: 0 (Number) is not \"falsy\" in this context.\n//\n// @private\n// @param {*} value Value to be checked.\nfunction isFalsy( value ) {\n\treturn !value && value !== 0;\n}\n\n// Checks if the item is an instance of {@link module:ui/view~View}\n//\n// @private\n// @param {*} value Value to be checked.\nfunction isView( item ) {\n\treturn item instanceof View;\n}\n\n// Checks if the item is an instance of {@link module:ui/template~Template}\n//\n// @private\n// @param {*} value Value to be checked.\nfunction isTemplate( item ) {\n\treturn item instanceof Template;\n}\n\n// Checks if the item is an instance of {@link module:ui/viewcollection~ViewCollection}\n//\n// @private\n// @param {*} value Value to be checked.\nfunction isViewCollection( item ) {\n\treturn item instanceof ViewCollection;\n}\n\n// Creates an empty skeleton for {@link module:ui/template~Template#revert}\n// data.\n//\n// @private\nfunction getEmptyRevertData() {\n\treturn {\n\t\tchildren: [],\n\t\tbindings: [],\n\t\tattributes: {}\n\t};\n}\n\n// Checks whether an attribute should be extended when\n// {@link module:ui/template~Template#apply} is called.\n//\n// @private\n// @param {String} attrName Attribute name to check.\nfunction shouldExtend( attrName ) {\n\treturn attrName == 'class' || attrName == 'style';\n}\n\n/**\n * A definition of the {@link module:ui/template~Template}. It describes what kind of\n * node a template will render (HTML element or text), attributes of an element, DOM event\n * listeners and children.\n *\n * Also see:\n * * {@link module:ui/template~TemplateValueSchema} to learn about HTML element attributes,\n * * {@link module:ui/template~TemplateListenerSchema} to learn about DOM event listeners.\n *\n * A sample definition on an HTML element can look like this:\n *\n *\t\tnew Template( {\n *\t\t\ttag: 'p',\n *\t\t\tchildren: [\n *\t\t\t\t{\n *\t\t\t\t\ttag: 'span',\n *\t\t\t\t\tattributes: { ... },\n *\t\t\t\t\tchildren: [ ... ],\n *\t\t\t\t},\n *\t\t\t\t{\n *\t\t\t\t\ttext: 'static–text'\n *\t\t\t\t},\n *\t\t\t\t'also-static–text',\n *\t\t\t],\n *\t\t\tattributes: {\n *\t\t\t\tclass: {@link module:ui/template~TemplateValueSchema},\n *\t\t\t\tid: {@link module:ui/template~TemplateValueSchema},\n *\t\t\t\tstyle: {@link module:ui/template~TemplateValueSchema}\n *\n *\t\t\t\t// ...\n *\t\t\t},\n *\t\t\ton: {\n *\t\t\t\t'click': {@link module:ui/template~TemplateListenerSchema}\n *\n *\t\t\t\t// Document.querySelector format is also accepted.\n *\t\t\t\t'keyup@a.some-class': {@link module:ui/template~TemplateListenerSchema}\n *\n *\t\t\t\t// ...\n *\t\t\t}\n *\t\t} );\n *\n * A {@link module:ui/view~View}, another {@link module:ui/template~Template} or a native DOM node\n * can also become a child of a template. When a view is passed, its {@link module:ui/view~View#element} is used:\n *\n *\t\tconst view = new SomeView();\n *\t\tconst childTemplate = new Template( { ... } );\n *\t\tconst childNode = document.createElement( 'b' );\n *\n *\t\tnew Template( {\n *\t\t\ttag: 'p',\n *\n *\t\t\tchildren: [\n *\t\t\t\t// view#element will be added as a child of this <p>.\n *\t\t\t\tview,\n *\n * \t\t\t\t// The output of childTemplate.render() will be added here.\n *\t\t\t\tchildTemplate,\n *\n *\t\t\t\t// Native DOM nodes are included directly in the rendered output.\n *\t\t\t\tchildNode\n *\t\t\t]\n *\t\t} );\n *\n * An entire {@link module:ui/viewcollection~ViewCollection} can be used as a child in the definition:\n *\n *\t\tconst collection = new ViewCollection();\n *\t\tcollection.add( someView );\n *\n *\t\tnew Template( {\n *\t\t\ttag: 'p',\n *\n *\t\t\tchildren: collection\n *\t\t} );\n *\n * @typedef module:ui/template~TemplateDefinition\n * @type Object\n *\n * @property {String} tag See the template {@link module:ui/template~Template#tag} property.\n *\n * @property {Array.<module:ui/template~TemplateDefinition>} [children]\n * See the template {@link module:ui/template~Template#children} property.\n *\n * @property {Object.<String, module:ui/template~TemplateValueSchema>} [attributes]\n * See the template {@link module:ui/template~Template#attributes} property.\n *\n * @property {String|module:ui/template~TemplateValueSchema|Array.<String|module:ui/template~TemplateValueSchema>} [text]\n * See the template {@link module:ui/template~Template#text} property.\n *\n * @property {Object.<String, module:ui/template~TemplateListenerSchema>} [on]\n * See the template {@link module:ui/template~Template#eventListeners} property.\n */\n\n/**\n * Describes a value of an HTML element attribute or `textContent`. It allows combining multiple\n * data sources like static values and {@link module:utils/observablemixin~Observable} attributes.\n *\n * Also see:\n * * {@link module:ui/template~TemplateDefinition} to learn where to use it,\n * * {@link module:ui/template~Template.bind} to learn how to configure\n * {@link module:utils/observablemixin~Observable} attribute bindings,\n * * {@link module:ui/template~Template#render} to learn how to render a template,\n * * {@link module:ui/template~BindChain#to `to()`} and {@link module:ui/template~BindChain#if `if()`}\n * methods to learn more about bindings.\n *\n * Attribute values can be described in many different ways:\n *\n *\t\t// Bind helper will create bindings to attributes of the observable.\n *\t\tconst bind = Template.bind( observable, emitter );\n *\n *\t\tnew Template( {\n *\t\t\ttag: 'p',\n *\t\t\tattributes: {\n *\t\t\t\t// A plain string schema.\n *\t\t\t\t'class': 'static-text',\n *\n *\t\t\t\t// An object schema, binds to the \"foo\" attribute of the\n *\t\t\t\t// observable and follows its value.\n *\t\t\t\t'class': bind.to( 'foo' ),\n *\n *\t\t\t\t// An array schema, combines the above.\n *\t\t\t\t'class': [\n *\t\t\t\t\t'static-text',\n *\t\t\t\t\tbind.to( 'bar', () => { ... } ),\n *\n * \t\t\t\t\t// Bindings can also be conditional.\n *\t\t\t\t\tbind.if( 'baz', 'class-when-baz-is-true' )\n *\t\t\t\t],\n *\n *\t\t\t\t// An array schema, with a custom namespace, e.g. useful for creating SVGs.\n *\t\t\t\t'class': {\n *\t\t\t\t\tns: 'http://ns.url',\n *\t\t\t\t\tvalue: [\n *\t\t\t\t\t\tbind.if( 'baz', 'value-when-true' ),\n *\t\t\t\t\t\t'static-text'\n *\t\t\t\t\t]\n *\t\t\t\t},\n *\n *\t\t\t\t// An object schema, specific for styles.\n *\t\t\t\tstyle: {\n *\t\t\t\t\tcolor: 'red',\n *\t\t\t\t\tbackgroundColor: bind.to( 'qux', () => { ... } )\n *\t\t\t\t}\n *\t\t\t}\n *\t\t} );\n *\n * Text nodes can also have complex values:\n *\n *\t\tconst bind = Template.bind( observable, emitter );\n *\n *\t\t// Will render a \"foo\" text node.\n *\t\tnew Template( {\n *\t\t\ttext: 'foo'\n *\t\t} );\n *\n *\t\t// Will render a \"static text: {observable.foo}\" text node.\n *\t\t// The text of the node will be updated as the \"foo\" attribute changes.\n *\t\tnew Template( {\n *\t\t\ttext: [\n *\t\t\t\t'static text: ',\n *\t\t\t\tbind.to( 'foo', () => { ... } )\n *\t\t\t]\n *\t\t} );\n *\n * @typedef module:ui/template~TemplateValueSchema\n * @type {Object|String|Array}\n */\n\n/**\n * Describes an event listener attached to an HTML element. Such listener can propagate DOM events\n * through an {@link module:utils/observablemixin~Observable} instance, execute custom callbacks\n * or both, if necessary.\n *\n * Also see:\n * * {@link module:ui/template~TemplateDefinition} to learn more about template definitions,\n * * {@link module:ui/template~BindChain#to `to()`} method to learn more about bindings.\n *\n * Check out different ways of attaching event listeners below:\n *\n *\t\t// Bind helper will propagate events through the observable.\n *\t\tconst bind = Template.bind( observable, emitter );\n *\n *\t\tnew Template( {\n *\t\t\ttag: 'p',\n *\t\t\ton: {\n *\t\t\t\t// An object schema. The observable will fire the \"clicked\" event upon DOM \"click\".\n *\t\t\t\tclick: bind.to( 'clicked' )\n *\n *\t\t\t\t// An object schema. It will work for \"click\" event on \"a.foo\" children only.\n *\t\t\t\t'click@a.foo': bind.to( 'clicked' )\n *\n *\t\t\t\t// An array schema, makes the observable propagate multiple events.\n *\t\t\t\tclick: [\n *\t\t\t\t\tbind.to( 'clicked' ),\n *\t\t\t\t\tbind.to( 'executed' )\n *\t\t\t\t],\n *\n *\t\t\t\t// An array schema with a custom callback.\n *\t\t\t\t'click@a.foo': {\n *\t\t\t\t\tbind.to( 'clicked' ),\n *\t\t\t\t\tbind.to( evt => {\n *\t\t\t\t\t\tconsole.log( `${ evt.target } has been clicked!` );\n *\t\t\t\t\t} }\n *\t\t\t\t}\n *\t\t\t}\n *\t\t} );\n *\n * @typedef module:ui/template~TemplateListenerSchema\n * @type {Object|String|Array}\n */\n\n/**\n * The return value of {@link ~Template.bind `Template.bind()`}. It provides `to()` and `if()`\n * methods to create the {@link module:utils/observablemixin~Observable observable} attribute and event bindings.\n *\n * @interface module:ui/template~BindChain\n */\n\n/**\n * Binds an {@link module:utils/observablemixin~Observable observable} to either:\n *\n * * an HTML element attribute or a text node `textContent`, so it remains in sync with the observable\n * attribute as it changes,\n * * or an HTML element DOM event, so the DOM events are propagated through an observable.\n *\n * Some common use cases of `to()` bindings are presented below:\n *\n *\t\tconst bind = Template.bind( observable, emitter );\n *\n *\t\tnew Template( {\n *\t\t\ttag: 'p',\n *\t\t\tattributes: {\n *\t\t\t\t// class=\"...\" attribute gets bound to `observable#a`\n *\t\t\t\tclass: bind.to( 'a' )\n *\t\t\t},\n *\t\t\tchildren: [\n *\t\t\t\t// <p>...</p> gets bound to observable#b; always `toUpperCase()`.\n *\t\t\t\t{\n *\t\t\t\t\ttext: bind.to( 'b', ( value, node ) => value.toUpperCase() )\n *\t\t\t\t}\n *\t\t\t],\n *\t\t\ton: {\n *\t\t\t\tclick: [\n *\t\t\t\t\t// An observable will fire \"clicked\" upon \"click\" in the DOM.\n *\t\t\t\t\tbind.to( 'clicked' ),\n *\n *\t\t\t\t\t// A custom callback will be executed upon \"click\" in the DOM.\n *\t\t\t\t\tbind.to( () => {\n *\t\t\t\t\t\t...\n *\t\t\t\t\t} )\n *\t\t\t\t]\n *\t\t\t}\n *\t\t} ).render();\n *\n * Learn more about using `to()` in the {@link module:ui/template~TemplateValueSchema} and\n * {@link module:ui/template~TemplateListenerSchema}.\n *\n * @method #to\n * @param {String|Function} eventNameOrFunctionOrAttribute An attribute name of\n * {@link module:utils/observablemixin~Observable} or a DOM event name or an event callback.\n * @param {Function} [callback] Allows for processing of the value. Accepts `Node` and `value` as arguments.\n * @returns {module:ui/template~TemplateBinding}\n */\n\n/**\n * Binds an {@link module:utils/observablemixin~Observable observable} to an HTML element attribute or a text\n * node `textContent` so it remains in sync with the observable attribute as it changes.\n *\n * Unlike {@link module:ui/template~BindChain#to}, it controls the presence of the attribute or `textContent`\n * depending on the \"falseness\" of an {@link module:utils/observablemixin~Observable} attribute.\n *\n *\t\tconst bind = Template.bind( observable, emitter );\n *\n *\t\tnew Template( {\n *\t\t\ttag: 'input',\n *\t\t\tattributes: {\n *\t\t\t\t// <input checked> when `observable#a` is not undefined/null/false/''\n *\t\t\t\t// <input> when `observable#a` is undefined/null/false\n *\t\t\t\tchecked: bind.if( 'a' )\n *\t\t\t},\n *\t\t\tchildren: [\n *\t\t\t\t{\n *\t\t\t\t\t// <input>\"b-is-not-set\"</input> when `observable#b` is undefined/null/false/''\n *\t\t\t\t\t// <input></input> when `observable#b` is not \"falsy\"\n *\t\t\t\t\ttext: bind.if( 'b', 'b-is-not-set', ( value, node ) => !value )\n *\t\t\t\t}\n *\t\t\t]\n *\t\t} ).render();\n *\n * Learn more about using `if()` in the {@link module:ui/template~TemplateValueSchema}.\n *\n * @method #if\n * @param {String} attribute An attribute name of {@link module:utils/observablemixin~Observable} used in the binding.\n * @param {String} [valueIfTrue] Value set when the {@link module:utils/observablemixin~Observable} attribute is not\n * undefined/null/false/'' (empty string).\n * @param {Function} [callback] Allows for processing of the value. Accepts `Node` and `value` as arguments.\n * @returns {module:ui/template~TemplateBinding}\n */\n\n/**\n * The {@link module:ui/template~Template#_renderNode} configuration.\n *\n * @private\n * @interface module:ui/template~RenderData\n */\n\n/**\n * Tells {@link module:ui/template~Template#_renderNode} to render\n * children into `DocumentFragment` first and then append the fragment\n * to the parent element. It is a speed optimization.\n *\n * @member {Boolean} #intoFragment\n */\n\n/**\n * A node which is being rendered.\n *\n * @member {HTMLElement|Text} #node\n */\n\n/**\n * Indicates whether the {@module:ui/template~RenderNodeOptions#node} has\n * been provided by {@module:ui/template~Template#apply}.\n *\n * @member {Boolean} #isApplying\n */\n\n/**\n * An object storing the data that helps {@module:ui/template~Template#revert}\n * bringing back an element to its initial state, i.e. before\n * {@module:ui/template~Template#apply} was called.\n *\n * @member {Object} #revertData\n */\n","import api from \"!../../../../style-loader/dist/runtime/injectStylesIntoStyleTag.js\";\n            import content from \"!!../../../../css-loader/dist/cjs.js!../../../../postcss-loader/dist/cjs.js??ref--5-2!./globals.css\";\n\nvar options = {\"injectType\":\"singletonStyleTag\",\"attributes\":{\"data-cke\":true}};\n\noptions.insert = \"head\";\noptions.singleton = true;\n\nvar update = api(content, options);\n\n\n\nexport default content.locals || {};","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module ui/view\n */\n\nimport CKEditorError from '@ckeditor/ckeditor5-utils/src/ckeditorerror';\nimport ViewCollection from './viewcollection';\nimport Template from './template';\nimport DomEmitterMixin from '@ckeditor/ckeditor5-utils/src/dom/emittermixin';\nimport ObservableMixin from '@ckeditor/ckeditor5-utils/src/observablemixin';\nimport Collection from '@ckeditor/ckeditor5-utils/src/collection';\nimport mix from '@ckeditor/ckeditor5-utils/src/mix';\nimport isIterable from '@ckeditor/ckeditor5-utils/src/isiterable';\n\nimport '../theme/globals/globals.css';\n\n/**\n * The basic view class, which represents an HTML element created out of a\n * {@link module:ui/view~View#template}. Views are building blocks of the user interface and handle\n * interaction\n *\n * Views {@link module:ui/view~View#registerChild aggregate} children in\n * {@link module:ui/view~View#createCollection collections} and manage the life cycle of DOM\n * listeners e.g. by handling rendering and destruction.\n *\n * See the {@link module:ui/template~TemplateDefinition} syntax to learn more about shaping view\n * elements, attributes and listeners.\n *\n *\t\tclass SampleView extends View {\n *\t\t\tconstructor( locale ) {\n *\t\t\t\tsuper( locale );\n *\n *\t\t\t\tconst bind = this.bindTemplate;\n *\n *\t\t\t\t// Views define their interface (state) using observable attributes.\n *\t\t\t\tthis.set( 'elementClass', 'bar' );\n *\n *\t\t\t\tthis.setTemplate( {\n *\t\t\t\t\ttag: 'p',\n *\n *\t\t\t\t\t// The element of the view can be defined with its children.\n *\t\t\t\t\tchildren: [\n *\t\t\t\t\t\t'Hello',\n *\t\t\t\t\t\t{\n *\t\t\t\t\t\t\ttag: 'b',\n *\t\t\t\t\t\t\tchildren: [ 'world!' ]\n *\t\t\t\t\t\t}\n *\t\t\t\t\t],\n *\t\t\t\t\tattributes: {\n *\t\t\t\t\t\tclass: [\n *\t\t\t\t\t\t\t'foo',\n *\n *\t\t\t\t\t\t\t// Observable attributes control the state of the view in DOM.\n *\t\t\t\t\t\t\tbind.to( 'elementClass' )\n *\t\t\t\t\t\t]\n *\t\t\t\t\t},\n *\t\t\t\t\ton: {\n *\t\t\t\t\t\t// Views listen to DOM events and propagate them.\n *\t\t\t\t\t\tclick: bind.to( 'clicked' )\n *\t\t\t\t\t}\n *\t\t\t\t} );\n *\t\t\t}\n *\t\t}\n *\n *\t\tconst view = new SampleView( locale );\n *\n *\t\tview.render();\n *\n *\t\t// Append <p class=\"foo bar\">Hello<b>world</b></p> to the <body>\n *\t\tdocument.body.appendChild( view.element );\n *\n *\t\t// Change the class attribute to <p class=\"foo baz\">Hello<b>world</b></p>\n *\t\tview.elementClass = 'baz';\n *\n *\t\t// Respond to the \"click\" event in DOM by executing a custom action.\n *\t\tview.on( 'clicked', () => {\n *\t\t\tconsole.log( 'The view has been clicked!' );\n *\t\t} );\n *\n * @mixes module:utils/observablemixin~ObservableMixin\n */\nexport default class View {\n\t/**\n\t * Creates an instance of the {@link module:ui/view~View} class.\n\t *\n\t * Also see {@link #render}.\n\t *\n\t * @param {module:utils/locale~Locale} [locale] The localization services instance.\n\t */\n\tconstructor( locale ) {\n\t\t/**\n\t\t * An HTML element of the view. `null` until {@link #render rendered}\n\t\t * from the {@link #template}.\n\t\t *\n\t\t *\t\tclass SampleView extends View {\n\t\t *\t\t\tconstructor() {\n\t\t *\t\t\t\tsuper();\n\t\t *\n\t\t *\t\t\t\t// A template instance the #element will be created from.\n\t\t *\t\t\t\tthis.setTemplate( {\n\t\t *\t\t\t\t\ttag: 'p'\n\t\t *\n\t\t *\t\t\t\t\t// ...\n\t\t *\t\t\t\t} );\n\t\t *\t\t\t}\n\t\t *\t\t}\n\t\t *\n\t\t *\t\tconst view = new SampleView();\n\t\t *\n\t\t *\t\t// Renders the #template.\n\t\t *\t\tview.render();\n\t\t *\n\t\t *\t\t// Append the HTML element of the view to <body>.\n\t\t *\t\tdocument.body.appendChild( view.element );\n\t\t *\n\t\t * **Note**: The element of the view can also be assigned directly:\n\t\t *\n\t\t *\t\tview.element = document.querySelector( '#my-container' );\n\t\t *\n\t\t * @member {HTMLElement}\n\t\t */\n\t\tthis.element = null;\n\n\t\t/**\n\t\t * Set `true` when the view has already been {@link module:ui/view~View#render rendered}.\n\t\t *\n\t\t * @readonly\n\t\t * @member {Boolean} #isRendered\n\t\t */\n\t\tthis.isRendered = false;\n\n\t\t/**\n\t\t * A set of tools to localize the user interface.\n\t\t *\n\t\t * Also see {@link module:core/editor/editor~Editor#locale}.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:utils/locale~Locale}\n\t\t */\n\t\tthis.locale = locale;\n\n\t\t/**\n\t\t * Shorthand for {@link module:utils/locale~Locale#t}.\n\t\t *\n\t\t * Note: If {@link #locale} instance hasn't been passed to the view this method may not\n\t\t * be available.\n\t\t *\n\t\t * @see module:utils/locale~Locale#t\n\t\t * @method\n\t\t */\n\t\tthis.t = locale && locale.t;\n\n\t\t/**\n\t\t * Collections registered with {@link #createCollection}.\n\t\t *\n\t\t * @protected\n\t\t * @member {Set.<module:ui/viewcollection~ViewCollection>}\n\t\t */\n\t\tthis._viewCollections = new Collection();\n\n\t\t/**\n\t\t * A collection of view instances, which have been added directly\n\t\t * into the {@link module:ui/template~Template#children}.\n\t\t *\n\t\t * @protected\n\t\t * @member {module:ui/viewcollection~ViewCollection}\n\t\t */\n\t\tthis._unboundChildren = this.createCollection();\n\n\t\t// Pass parent locale to its children.\n\t\tthis._viewCollections.on( 'add', ( evt, collection ) => {\n\t\t\tcollection.locale = locale;\n\t\t} );\n\n\t\t/**\n\t\t * Template of this view. It provides the {@link #element} representing\n\t\t * the view in DOM, which is {@link #render rendered}.\n\t\t *\n\t\t * @member {module:ui/template~Template} #template\n\t\t */\n\n\t\t/**\n\t\t * Cached {@link module:ui/template~BindChain bind chain} object created by the\n\t\t * {@link #template}. See {@link #bindTemplate}.\n\t\t *\n\t\t * @private\n\t\t * @member {Object} #_bindTemplate\n\t\t */\n\n\t\tthis.decorate( 'render' );\n\t}\n\n\t/**\n\t * Shorthand for {@link module:ui/template~Template.bind}, a binding\n\t * {@link module:ui/template~BindChain interface} pre–configured for the view instance.\n\t *\n\t * It provides {@link module:ui/template~BindChain#to `to()`} and\n\t * {@link module:ui/template~BindChain#if `if()`} methods that initialize bindings with\n\t * observable attributes and attach DOM listeners.\n\t *\n\t *\t\tclass SampleView extends View {\n\t *\t\t\tconstructor( locale ) {\n\t *\t\t\t\tsuper( locale );\n\t *\n\t *\t\t\t\tconst bind = this.bindTemplate;\n\t *\n\t *\t\t\t\t// These {@link module:utils/observablemixin~Observable observable} attributes will control\n\t *\t\t\t\t// the state of the view in DOM.\n\t *\t\t\t\tthis.set( {\n\t *\t\t\t\t\telementClass: 'foo',\n\t *\t\t\t\t \tisEnabled: true\n\t *\t\t\t\t } );\n\t *\n\t *\t\t\t\tthis.setTemplate( {\n\t *\t\t\t\t\ttag: 'p',\n\t *\n\t *\t\t\t\t\tattributes: {\n\t *\t\t\t\t\t\t// The class HTML attribute will follow elementClass\n\t *\t\t\t\t\t\t// and isEnabled view attributes.\n\t *\t\t\t\t\t\tclass: [\n\t *\t\t\t\t\t\t\tbind.to( 'elementClass' )\n\t *\t\t\t\t\t\t\tbind.if( 'isEnabled', 'present-when-enabled' )\n\t *\t\t\t\t\t\t]\n\t *\t\t\t\t\t},\n\t *\n\t *\t\t\t\t\ton: {\n\t *\t\t\t\t\t\t// The view will fire the \"clicked\" event upon clicking <p> in DOM.\n\t *\t\t\t\t\t\tclick: bind.to( 'clicked' )\n\t *\t\t\t\t\t}\n\t *\t\t\t\t} );\n\t *\t\t\t}\n\t *\t\t}\n\t *\n\t * @method #bindTemplate\n\t */\n\tget bindTemplate() {\n\t\tif ( this._bindTemplate ) {\n\t\t\treturn this._bindTemplate;\n\t\t}\n\n\t\treturn ( this._bindTemplate = Template.bind( this, this ) );\n\t}\n\n\t/**\n\t * Creates a new collection of views, which can be used as\n\t * {@link module:ui/template~Template#children} of this view.\n\t *\n\t *\t\tclass SampleView extends View {\n\t *\t\t\tconstructor( locale ) {\n\t *\t\t\t\tsuper( locale );\n\t *\n\t *\t\t\t\tconst child = new ChildView( locale );\n\t *\t\t\t\tthis.items = this.createCollection( [ child ] );\n \t *\n\t *\t\t\t\tthis.setTemplate( {\n\t *\t\t\t\t\ttag: 'p',\n\t *\n\t *\t\t\t\t\t// `items` collection will render here.\n\t *\t\t\t\t\tchildren: this.items\n\t *\t\t\t\t} );\n\t *\t\t\t}\n\t *\t\t}\n\t *\n\t *\t\tconst view = new SampleView( locale );\n\t *\t\tview.render();\n\t *\n\t *\t\t// It will append <p><child#element></p> to the <body>.\n\t *\t\tdocument.body.appendChild( view.element );\n\t *\n\t * @param {Iterable.<module:ui/view~View>} [views] Initial views of the collection.\n\t * @returns {module:ui/viewcollection~ViewCollection} A new collection of view instances.\n\t */\n\tcreateCollection( views ) {\n\t\tconst collection = new ViewCollection( views );\n\n\t\tthis._viewCollections.add( collection );\n\n\t\treturn collection;\n\t}\n\n\t/**\n\t * Registers a new child view under the view instance. Once registered, a child\n\t * view is managed by its parent, including {@link #render rendering}\n\t * and {@link #destroy destruction}.\n\t *\n\t * To revert this, use {@link #deregisterChild}.\n\t *\n\t *\t\tclass SampleView extends View {\n\t *\t\t\tconstructor( locale ) {\n\t *\t\t\t\tsuper( locale );\n\t *\n\t *\t\t\t\tthis.childA = new SomeChildView( locale );\n\t *\t\t\t\tthis.childB = new SomeChildView( locale );\n\t *\n\t *\t\t\t\tthis.setTemplate( { tag: 'p' } );\n\t *\n\t *\t\t\t\t// Register the children.\n\t *\t\t\t\tthis.registerChild( [ this.childA, this.childB ] );\n\t *\t\t\t}\n\t *\n\t *\t\t\trender() {\n\t *\t\t\t\tsuper.render();\n\t *\n\t *\t\t\t\tthis.element.appendChild( this.childA.element );\n\t *\t\t\t\tthis.element.appendChild( this.childB.element );\n\t *\t\t\t}\n\t *\t\t}\n\t *\n\t *\t\tconst view = new SampleView( locale );\n\t *\n\t *\t\tview.render();\n\t *\n\t *\t\t// Will append <p><childA#element><b></b><childB#element></p>.\n\t *\t\tdocument.body.appendChild( view.element );\n\t *\n\t * **Note**: There's no need to add child views if they're already referenced in the\n\t * {@link #template}:\n\t *\n\t *\t\tclass SampleView extends View {\n\t *\t\t\tconstructor( locale ) {\n\t *\t\t\t\tsuper( locale );\n\t *\n\t *\t\t\t\tthis.childA = new SomeChildView( locale );\n\t *\t\t\t\tthis.childB = new SomeChildView( locale );\n\t *\n\t *\t\t\t\tthis.setTemplate( {\n\t *\t\t\t\t\ttag: 'p',\n\t *\n \t *\t\t\t\t\t// These children will be added automatically. There's no\n \t *\t\t\t\t\t// need to call {@link #registerChild} for any of them.\n\t *\t\t\t\t\tchildren: [ this.childA, this.childB ]\n\t *\t\t\t\t} );\n\t *\t\t\t}\n\t *\n\t *\t\t\t// ...\n\t *\t\t}\n\t *\n\t * @param {module:ui/view~View|Iterable.<module:ui/view~View>} children Children views to be registered.\n\t */\n\tregisterChild( children ) {\n\t\tif ( !isIterable( children ) ) {\n\t\t\tchildren = [ children ];\n\t\t}\n\n\t\tfor ( const child of children ) {\n\t\t\tthis._unboundChildren.add( child );\n\t\t}\n\t}\n\n\t/**\n\t * The opposite of {@link #registerChild}. Removes a child view from this view instance.\n\t * Once removed, the child is no longer managed by its parent, e.g. it can safely\n\t * become a child of another parent view.\n\t *\n\t * @see #registerChild\n\t * @param {module:ui/view~View|Iterable.<module:ui/view~View>} children Child views to be removed.\n\t */\n\tderegisterChild( children ) {\n\t\tif ( !isIterable( children ) ) {\n\t\t\tchildren = [ children ];\n\t\t}\n\n\t\tfor ( const child of children ) {\n\t\t\tthis._unboundChildren.remove( child );\n\t\t}\n\t}\n\n\t/**\n\t * Sets the {@link #template} of the view with with given definition.\n\t *\n\t * A shorthand for:\n\t *\n\t *\t\tview.setTemplate( definition );\n\t *\n\t * @param {module:ui/template~TemplateDefinition} definition Definition of view's template.\n\t */\n\tsetTemplate( definition ) {\n\t\tthis.template = new Template( definition );\n\t}\n\n\t/**\n\t * {@link module:ui/template~Template.extend Extends} the {@link #template} of the view with\n\t * with given definition.\n\t *\n\t * A shorthand for:\n\t *\n\t *\t\tTemplate.extend( view.template, definition );\n\t *\n\t * **Note**: Is requires the {@link #template} to be already set. See {@link #setTemplate}.\n\t *\n\t * @param {module:ui/template~TemplateDefinition} definition Definition which\n\t * extends the {@link #template}.\n\t */\n\textendTemplate( definition ) {\n\t\tTemplate.extend( this.template, definition );\n\t}\n\n\t/**\n\t * Recursively renders the view.\n\t *\n\t * Once the view is rendered:\n\t * * the {@link #element} becomes an HTML element out of {@link #template},\n\t * * the {@link #isRendered} flag is set `true`.\n\t *\n\t * **Note**: The children of the view:\n\t * * defined directly in the {@link #template}\n\t * * residing in collections created by the {@link #createCollection} method,\n\t * * and added by {@link #registerChild}\n\t * are also rendered in the process.\n\t *\n\t * In general, `render()` method is the right place to keep the code which refers to the\n\t * {@link #element} and should be executed at the very beginning of the view's life cycle.\n\t *\n\t * It is possible to {@link module:ui/template~Template.extend} the {@link #template} before\n\t * the view is rendered. To allow an early customization of the view (e.g. by its parent),\n\t * such references should be done in `render()`.\n\t *\n\t *\t\tclass SampleView extends View {\n\t *\t\t\tconstructor() {\n\t *\t\t\t\tthis.setTemplate( {\n\t *\t\t\t\t\t// ...\n\t *\t\t\t\t} );\n\t *\t\t\t},\n\t *\n\t *\t\t\trender() {\n\t *\t\t\t\t// View#element becomes available.\n\t *\t\t\t\tsuper.render();\n\t *\n\t *\t\t\t\t// The \"scroll\" listener depends on #element.\n\t *\t\t\t\tthis.listenTo( window, 'scroll', () => {\n\t *\t\t\t\t\t// A reference to #element would render the #template and make it non-extendable.\n\t *\t\t\t\t\tif ( window.scrollY > 0 ) {\n\t *\t\t\t\t\t\tthis.element.scrollLeft = 100;\n\t *\t\t\t\t\t} else {\n\t *\t\t\t\t\t\tthis.element.scrollLeft = 0;\n\t *\t\t\t\t\t}\n\t *\t\t\t\t} );\n\t *\t\t\t}\n\t *\t\t}\n\t *\n\t *\t\tconst view = new SampleView();\n\t *\n\t *\t\t// Let's customize the view before it gets rendered.\n\t *\t\tview.extendTemplate( {\n\t *\t\t\tattributes: {\n\t *\t\t\t\tclass: [\n\t *\t\t\t\t\t'additional-class'\n\t *\t\t\t\t]\n\t *\t\t\t}\n\t *\t\t} );\n\t *\n\t *\t\t// Late rendering allows customization of the view.\n\t *\t\tview.render();\n\t */\n\trender() {\n\t\tif ( this.isRendered ) {\n\t\t\t/**\n\t\t\t * This View has already been rendered.\n\t\t\t *\n\t\t\t * @error ui-view-render-already-rendered\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'ui-view-render-already-rendered', this );\n\t\t}\n\n\t\t// Render #element of the view.\n\t\tif ( this.template ) {\n\t\t\tthis.element = this.template.render();\n\n\t\t\t// Auto–register view children from #template.\n\t\t\tthis.registerChild( this.template.getViews() );\n\t\t}\n\n\t\tthis.isRendered = true;\n\t}\n\n\t/**\n\t * Recursively destroys the view instance and child views added by {@link #registerChild} and\n\t * residing in collections created by the {@link #createCollection}.\n\t *\n\t * Destruction disables all event listeners:\n\t * * created on the view, e.g. `view.on( 'event', () => {} )`,\n\t * * defined in the {@link #template} for DOM events.\n\t */\n\tdestroy() {\n\t\tthis.stopListening();\n\n\t\tthis._viewCollections.map( c => c.destroy() );\n\n\t\t// Template isn't obligatory for views.\n\t\tif ( this.template && this.template._revertData ) {\n\t\t\tthis.template.revert( this.element );\n\t\t}\n\t}\n\n\t/**\n\t * Event fired by the {@link #render} method. Actual rendering is executed as a listener to\n\t * this event with the default priority.\n\t *\n\t * See {@link module:utils/observablemixin~ObservableMixin#decorate} for more information and samples.\n\t *\n\t * @event render\n\t */\n}\n\nmix( View, DomEmitterMixin );\nmix( View, ObservableMixin );\n","import baseGetTag from './_baseGetTag.js';\nimport isArray from './isArray.js';\nimport isObjectLike from './isObjectLike.js';\n\n/** `Object#toString` result references. */\nvar stringTag = '[object String]';\n\n/**\n * Checks if `value` is classified as a `String` primitive or object.\n *\n * @static\n * @since 0.1.0\n * @memberOf _\n * @category Lang\n * @param {*} value The value to check.\n * @returns {boolean} Returns `true` if `value` is a string, else `false`.\n * @example\n *\n * _.isString('abc');\n * // => true\n *\n * _.isString(1);\n * // => false\n */\nfunction isString(value) {\n  return typeof value == 'string' ||\n    (!isArray(value) && isObjectLike(value) && baseGetTag(value) == stringTag);\n}\n\nexport default isString;\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module ui/editorui/bodycollection\n */\n\n/* globals document */\n\nimport Template from '../template';\nimport ViewCollection from '../viewcollection';\n\nimport createElement from '@ckeditor/ckeditor5-utils/src/dom/createelement';\n\n/**\n * This is a special {@link module:ui/viewcollection~ViewCollection} dedicated to elements that are detached\n * from the DOM structure of the editor, like panels, icons, etc.\n *\n * The body collection is available in the {@link module:ui/editorui/editoruiview~EditorUIView#body `editor.ui.view.body`} property.\n * Any plugin can add a {@link module:ui/view~View view} to this collection.\n * These views will render in a container placed directly in the `<body>` element.\n * The editor will detach and destroy this collection when the editor will be {@link module:core/editor/editor~Editor#destroy destroyed}.\n *\n * If you need to control the life cycle of the body collection on your own, you can create your own instance of this class.\n *\n * A body collection will render itself automatically in the DOM body element as soon as you call {@link ~BodyCollection#attachToDom}.\n * If you create multiple body collections, this class will create a special wrapper element in the DOM to limit the number of\n * elements created directly in the body and remove it when the last body collection will be\n * {@link ~BodyCollection#detachFromDom detached}.\n *\n * @extends module:ui/viewcollection~ViewCollection\n */\nexport default class BodyCollection extends ViewCollection {\n\t/**\n\t * Creates a new instance of the {@link module:ui/editorui/bodycollection~BodyCollection}.\n\t *\n\t * @param {module:utils/locale~Locale} locale The {@link module:core/editor/editor~Editor editor's locale} instance.\n\t * @param {Iterable.<module:ui/view~View>} [initialItems] The initial items of the collection.\n\t */\n\tconstructor( locale, initialItems = [] ) {\n\t\tsuper( initialItems );\n\n\t\t/**\n\t\t * The {@link module:core/editor/editor~Editor#locale editor's locale} instance.\n\t\t * See the view {@link module:ui/view~View#locale locale} property.\n\t\t *\n\t\t * @member {module:utils/locale~Locale}\n\t\t */\n\t\tthis.locale = locale;\n\t}\n\n\t/**\n\t * Attaches the body collection to the DOM body element. You need to execute this method to render the content of\n\t * the body collection.\n\t */\n\tattachToDom() {\n\t\t/**\n\t\t * The element holding elements of the body region.\n\t\t *\n\t\t * @protected\n\t\t * @member {HTMLElement} #_bodyCollectionContainer\n\t\t */\n\t\tthis._bodyCollectionContainer = new Template( {\n\t\t\ttag: 'div',\n\t\t\tattributes: {\n\t\t\t\tclass: [\n\t\t\t\t\t'ck',\n\t\t\t\t\t'ck-reset_all',\n\t\t\t\t\t'ck-body',\n\t\t\t\t\t'ck-rounded-corners'\n\t\t\t\t],\n\t\t\t\tdir: this.locale.uiLanguageDirection\n\t\t\t},\n\t\t\tchildren: this\n\t\t} ).render();\n\n\t\tlet wrapper = document.querySelector( '.ck-body-wrapper' );\n\n\t\tif ( !wrapper ) {\n\t\t\twrapper = createElement( document, 'div', { class: 'ck-body-wrapper' } );\n\t\t\tdocument.body.appendChild( wrapper );\n\t\t}\n\n\t\twrapper.appendChild( this._bodyCollectionContainer );\n\t}\n\n\t/**\n\t * Detaches the collection from the DOM structure. Use this method when you do not need to use the body collection\n\t * anymore to clean-up the DOM structure.\n\t */\n\tdetachFromDom() {\n\t\tsuper.destroy();\n\n\t\tif ( this._bodyCollectionContainer ) {\n\t\t\tthis._bodyCollectionContainer.remove();\n\t\t}\n\n\t\tconst wrapper = document.querySelector( '.ck-body-wrapper' );\n\n\t\tif ( wrapper && wrapper.childElementCount == 0 ) {\n\t\t\twrapper.remove();\n\t\t}\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module utils/dom/createelement\n */\n\nimport isIterable from '../isiterable';\nimport { isString } from 'lodash-es';\n\n/**\n * Creates element with attributes and children.\n *\n *\t\tcreateElement( document, 'p' ); // <p>\n *\t\tcreateElement( document, 'p', { class: 'foo' } ); // <p class=\"foo\">\n *\t\tcreateElement( document, 'p', null, 'foo' ); // <p>foo</p>\n *\t\tcreateElement( document, 'p', null, [ 'foo', createElement( document, 'img' ) ] ); // <p>foo<img></p>\n *\n * @param {Document} doc Document used to create element.\n * @param {String} name Name of the element.\n * @param {Object} [attributes] Object keys will become attributes keys and object values will became attributes values.\n * @param {Node|String|Array.<Node|String>} [children] Child or array of children. Strings will be automatically turned\n * into Text nodes.\n * @returns {Element} Created element.\n */\nexport default function createElement( doc, name, attributes = {}, children = [] ) {\n\tconst namespace = attributes && attributes.xmlns;\n\tconst element = namespace ? doc.createElementNS( namespace, name ) : doc.createElement( name );\n\n\tfor ( const key in attributes ) {\n\t\telement.setAttribute( key, attributes[ key ] );\n\t}\n\n\tif ( isString( children ) || !isIterable( children ) ) {\n\t\tchildren = [ children ];\n\t}\n\n\tfor ( let child of children ) {\n\t\tif ( isString( child ) ) {\n\t\t\tchild = doc.createTextNode( child );\n\t\t}\n\n\t\telement.appendChild( child );\n\t}\n\n\treturn element;\n}\n","import api from \"!../../../../../style-loader/dist/runtime/injectStylesIntoStyleTag.js\";\n            import content from \"!!../../../../../css-loader/dist/cjs.js!../../../../../postcss-loader/dist/cjs.js??ref--5-2!./editorui.css\";\n\nvar options = {\"injectType\":\"singletonStyleTag\",\"attributes\":{\"data-cke\":true}};\n\noptions.insert = \"head\";\noptions.singleton = true;\n\nvar update = api(content, options);\n\n\n\nexport default content.locals || {};","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module ui/editorui/editoruiview\n */\n\nimport View from '../view';\nimport BodyCollection from './bodycollection';\n\nimport '../../theme/components/editorui/editorui.css';\n\n/**\n * The editor UI view class. Base class for the editor main views.\n *\n * @extends module:ui/view~View\n */\nexport default class EditorUIView extends View {\n\t/**\n\t * Creates an instance of the editor UI view class.\n\t *\n\t * @param {module:utils/locale~Locale} [locale] The locale instance.\n\t */\n\tconstructor( locale ) {\n\t\tsuper( locale );\n\n\t\t/**\n\t\t * Collection of the child views, detached from the DOM\n\t\t * structure of the editor, like panels, icons etc.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:ui/viewcollection~ViewCollection} #body\n\t\t */\n\t\tthis.body = new BodyCollection( locale );\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\trender() {\n\t\tsuper.render();\n\n\t\tthis.body.attachToDom();\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tdestroy() {\n\t\tthis.body.detachFromDom();\n\n\t\treturn super.destroy();\n\t}\n}\n","import api from \"!../../../../../style-loader/dist/runtime/injectStylesIntoStyleTag.js\";\n            import content from \"!!../../../../../css-loader/dist/cjs.js!../../../../../postcss-loader/dist/cjs.js??ref--5-2!./label.css\";\n\nvar options = {\"injectType\":\"singletonStyleTag\",\"attributes\":{\"data-cke\":true}};\n\noptions.insert = \"head\";\noptions.singleton = true;\n\nvar update = api(content, options);\n\n\n\nexport default content.locals || {};","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module ui/label/labelview\n */\n\nimport View from '../view';\nimport uid from '@ckeditor/ckeditor5-utils/src/uid';\n\nimport '../../theme/components/label/label.css';\n\n/**\n * The label view class.\n *\n * @extends module:ui/view~View\n */\nexport default class LabelView extends View {\n\t/**\n\t * @inheritDoc\n\t */\n\tconstructor( locale ) {\n\t\tsuper( locale );\n\n\t\t/**\n\t\t * The text of the label.\n\t\t *\n\t\t * @observable\n\t\t * @member {String} #text\n\t\t */\n\t\tthis.set( 'text' );\n\n\t\t/**\n\t\t * The `for` attribute of the label (i.e. to pair with an `<input>` element).\n\t\t *\n\t\t * @observable\n\t\t * @member {String} #for\n\t\t */\n\t\tthis.set( 'for' );\n\n\t\t/**\n\t\t * An unique id of the label. It can be used by other UI components to reference\n\t\t * the label, for instance, using the `aria-describedby` DOM attribute.\n\t\t *\n\t\t * @member {String} #id\n\t\t */\n\t\tthis.id = `ck-editor__label_${ uid() }`;\n\n\t\tconst bind = this.bindTemplate;\n\n\t\tthis.setTemplate( {\n\t\t\ttag: 'label',\n\t\t\tattributes: {\n\t\t\t\tclass: [\n\t\t\t\t\t'ck',\n\t\t\t\t\t'ck-label'\n\t\t\t\t],\n\t\t\t\tid: this.id,\n\t\t\t\tfor: bind.to( 'for' )\n\t\t\t},\n\t\t\tchildren: [\n\t\t\t\t{\n\t\t\t\t\ttext: bind.to( 'text' )\n\t\t\t\t}\n\t\t\t]\n\t\t} );\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module ui/editorui/boxed/boxededitoruiview\n */\n\nimport EditorUIView from '../../editorui/editoruiview';\nimport LabelView from '../../label/labelview';\n\n/**\n * The boxed editor UI view class. This class represents an editor interface\n * consisting of a toolbar and an editable area, enclosed within a box.\n *\n * @extends module:ui/editorui/editoruiview~EditorUIView\n */\nexport default class BoxedEditorUIView extends EditorUIView {\n\t/**\n\t * Creates an instance of the boxed editor UI view class.\n\t *\n\t * @param {module:utils/locale~Locale} locale The locale instance..\n\t */\n\tconstructor( locale ) {\n\t\tsuper( locale );\n\n\t\t/**\n\t\t * Collection of the child views located in the top (`.ck-editor__top`)\n\t\t * area of the UI.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:ui/viewcollection~ViewCollection}\n\t\t */\n\t\tthis.top = this.createCollection();\n\n\t\t/**\n\t\t * Collection of the child views located in the main (`.ck-editor__main`)\n\t\t * area of the UI.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:ui/viewcollection~ViewCollection}\n\t\t */\n\t\tthis.main = this.createCollection();\n\n\t\t/**\n\t\t * Voice label of the UI.\n\t\t *\n\t\t * @protected\n\t\t * @readonly\n\t\t * @member {module:ui/view~View} #_voiceLabelView\n\t\t */\n\t\tthis._voiceLabelView = this._createVoiceLabel();\n\n\t\tthis.setTemplate( {\n\t\t\ttag: 'div',\n\n\t\t\tattributes: {\n\t\t\t\tclass: [\n\t\t\t\t\t'ck',\n\t\t\t\t\t'ck-reset',\n\t\t\t\t\t'ck-editor',\n\t\t\t\t\t'ck-rounded-corners'\n\t\t\t\t],\n\t\t\t\trole: 'application',\n\t\t\t\tdir: locale.uiLanguageDirection,\n\t\t\t\tlang: locale.uiLanguage,\n\t\t\t\t'aria-labelledby': this._voiceLabelView.id\n\t\t\t},\n\n\t\t\tchildren: [\n\t\t\t\tthis._voiceLabelView,\n\t\t\t\t{\n\t\t\t\t\ttag: 'div',\n\t\t\t\t\tattributes: {\n\t\t\t\t\t\tclass: [\n\t\t\t\t\t\t\t'ck',\n\t\t\t\t\t\t\t'ck-editor__top',\n\t\t\t\t\t\t\t'ck-reset_all'\n\t\t\t\t\t\t],\n\t\t\t\t\t\trole: 'presentation'\n\t\t\t\t\t},\n\t\t\t\t\tchildren: this.top\n\t\t\t\t},\n\t\t\t\t{\n\t\t\t\t\ttag: 'div',\n\t\t\t\t\tattributes: {\n\t\t\t\t\t\tclass: [\n\t\t\t\t\t\t\t'ck',\n\t\t\t\t\t\t\t'ck-editor__main'\n\t\t\t\t\t\t],\n\t\t\t\t\t\trole: 'presentation'\n\t\t\t\t\t},\n\t\t\t\t\tchildren: this.main\n\t\t\t\t}\n\t\t\t]\n\t\t} );\n\t}\n\n\t/**\n\t * Creates a voice label view instance.\n\t *\n\t * @private\n\t * @returns {module:ui/label/labelview~LabelView}\n\t */\n\t_createVoiceLabel() {\n\t\tconst t = this.t;\n\t\tconst voiceLabel = new LabelView();\n\n\t\tvoiceLabel.text = t( 'Rich Text Editor' );\n\n\t\tvoiceLabel.extendTemplate( {\n\t\t\tattributes: {\n\t\t\t\tclass: 'ck-voice-label'\n\t\t\t}\n\t\t} );\n\n\t\treturn voiceLabel;\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module ui/editableui/editableuiview\n */\n\nimport View from '../view';\n\n/**\n * The editable UI view class.\n *\n * @extends module:ui/view~View\n */\nexport default class EditableUIView extends View {\n\t/**\n\t * Creates an instance of EditableUIView class.\n\t *\n\t * @param {module:utils/locale~Locale} [locale] The locale instance.\n\t * @param {module:engine/view/view~View} editingView The editing view instance the editable is related to.\n\t * @param {HTMLElement} [editableElement] The editable element. If not specified, this view\n\t * should create it. Otherwise, the existing element should be used.\n\t */\n\tconstructor( locale, editingView, editableElement ) {\n\t\tsuper( locale );\n\n\t\tthis.setTemplate( {\n\t\t\ttag: 'div',\n\t\t\tattributes: {\n\t\t\t\tclass: [\n\t\t\t\t\t'ck',\n\t\t\t\t\t'ck-content',\n\t\t\t\t\t'ck-editor__editable',\n\t\t\t\t\t'ck-rounded-corners'\n\t\t\t\t],\n\t\t\t\tlang: locale.contentLanguage,\n\t\t\t\tdir: locale.contentLanguageDirection\n\t\t\t}\n\t\t} );\n\n\t\t/**\n\t\t * The name of the editable UI view.\n\t\t *\n\t\t * @member {String} #name\n\t\t */\n\t\tthis.name = null;\n\n\t\t/**\n\t\t * Controls whether the editable is focused, i.e. the user is typing in it.\n\t\t *\n\t\t * @observable\n\t\t * @member {Boolean} #isFocused\n\t\t */\n\t\tthis.set( 'isFocused', false );\n\n\t\t/**\n\t\t * The element which is the main editable element (usually the one with `contentEditable=\"true\"`).\n\t\t *\n\t\t * @private\n\t\t * @type {HTMLElement}\n\t\t */\n\t\tthis._editableElement = editableElement;\n\n\t\t/**\n\t\t * Whether an external {@link #_editableElement} was passed into the constructor, which also means\n\t\t * the view will not render its {@link #template}.\n\t\t *\n\t\t * @private\n\t\t * @type {Boolean}\n\t\t */\n\t\tthis._hasExternalElement = !!this._editableElement;\n\n\t\t/**\n\t\t * The editing view instance the editable is related to. Editable uses the editing\n\t\t * view to dynamically modify its certain DOM attributes after {@link #render rendering}.\n\t\t *\n\t\t * **Note**: The DOM attributes are performed by the editing view and not UI\n\t\t * {@link module:ui/view~View#bindTemplate template bindings} because once rendered,\n\t\t * the editable DOM element must remain under the full control of the engine to work properly.\n\t\t *\n\t\t * @protected\n\t\t * @type {module:engine/view/view~View}\n\t\t */\n\t\tthis._editingView = editingView;\n\t}\n\n\t/**\n\t * Renders the view by either applying the {@link #template} to the existing\n\t * {@link #_editableElement} or assigning {@link #element} as {@link #_editableElement}.\n\t */\n\trender() {\n\t\tsuper.render();\n\n\t\tif ( this._hasExternalElement ) {\n\t\t\tthis.template.apply( this.element = this._editableElement );\n\t\t} else {\n\t\t\tthis._editableElement = this.element;\n\t\t}\n\n\t\tthis.on( 'change:isFocused', () => this._updateIsFocusedClasses() );\n\t\tthis._updateIsFocusedClasses();\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tdestroy() {\n\t\tif ( this._hasExternalElement ) {\n\t\t\tthis.template.revert( this._editableElement );\n\t\t}\n\n\t\tsuper.destroy();\n\t}\n\n\t/**\n\t * Updates the `ck-focused` and `ck-blurred` CSS classes on the {@link #element} according to\n\t * the {@link #isFocused} property value using the {@link #_editingView editing view} API.\n\t *\n\t * @private\n\t */\n\t_updateIsFocusedClasses() {\n\t\tconst editingView = this._editingView;\n\n\t\tif ( editingView.isRenderingInProgress ) {\n\t\t\tupdateAfterRender( this );\n\t\t} else {\n\t\t\tupdate( this );\n\t\t}\n\n\t\tfunction update( view ) {\n\t\t\teditingView.change( writer => {\n\t\t\t\tconst viewRoot = editingView.document.getRoot( view.name );\n\n\t\t\t\twriter.addClass( view.isFocused ? 'ck-focused' : 'ck-blurred', viewRoot );\n\t\t\t\twriter.removeClass( view.isFocused ? 'ck-blurred' : 'ck-focused', viewRoot );\n\t\t\t} );\n\t\t}\n\n\t\t// In a case of a multi-root editor, a callback will be attached more than once (one callback for each root).\n\t\t// While executing one callback the `isRenderingInProgress` observable is changing what causes executing another\n\t\t// callback and render is called inside the already pending render.\n\t\t// We need to be sure that callback is executed only when the value has changed from `true` to `false`.\n\t\t// See https://github.com/ckeditor/ckeditor5/issues/1676.\n\t\tfunction updateAfterRender( view ) {\n\t\t\teditingView.once( 'change:isRenderingInProgress', ( evt, name, value ) => {\n\t\t\t\tif ( !value ) {\n\t\t\t\t\tupdate( view );\n\t\t\t\t} else {\n\t\t\t\t\tupdateAfterRender( view );\n\t\t\t\t}\n\t\t\t} );\n\t\t}\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module ui/editableui/inline/inlineeditableuiview\n */\n\nimport EditableUIView from '../../editableui/editableuiview';\n\n/**\n * The inline editable UI class implementing an inline {@link module:ui/editableui/editableuiview~EditableUIView}.\n *\n * @extends module:ui/editableui/editableuiview~EditableUIView\n */\nexport default class InlineEditableUIView extends EditableUIView {\n\t/**\n\t * Creates an instance of the InlineEditableUIView class.\n\t *\n\t * @param {module:utils/locale~Locale} [locale] The locale instance.\n\t * @param {module:engine/view/view~View} editingView The editing view instance the editable is related to.\n\t * @param {HTMLElement} [editableElement] The editable element. If not specified, the\n\t * {@link module:ui/editableui/editableuiview~EditableUIView}\n\t * will create it. Otherwise, the existing element will be used.\n\t */\n\tconstructor( locale, editingView, editableElement ) {\n\t\tsuper( locale, editingView, editableElement );\n\n\t\tthis.extendTemplate( {\n\t\t\tattributes: {\n\t\t\t\trole: 'textbox',\n\t\t\t\tclass: 'ck-editor__editable_inline'\n\t\t\t}\n\t\t} );\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\trender() {\n\t\tsuper.render();\n\n\t\tconst editingView = this._editingView;\n\t\tconst t = this.t;\n\n\t\teditingView.change( writer => {\n\t\t\tconst viewRoot = editingView.document.getRoot( this.name );\n\n\t\t\twriter.setAttribute( 'aria-label', t( 'Rich Text Editor, %0', this.name ), viewRoot );\n\t\t} );\n\t}\n}\n","import api from \"!../../../../../style-loader/dist/runtime/injectStylesIntoStyleTag.js\";\n            import content from \"!!../../../../../css-loader/dist/cjs.js!../../../../../postcss-loader/dist/cjs.js??ref--5-2!./stickypanel.css\";\n\nvar options = {\"injectType\":\"singletonStyleTag\",\"attributes\":{\"data-cke\":true}};\n\noptions.insert = \"head\";\noptions.singleton = true;\n\nvar update = api(content, options);\n\n\n\nexport default content.locals || {};","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module ui/panel/sticky/stickypanelview\n */\n\nimport global from '@ckeditor/ckeditor5-utils/src/dom/global';\nimport View from '../../view';\nimport Template from '../../template';\nimport toUnit from '@ckeditor/ckeditor5-utils/src/dom/tounit';\n\nimport '../../../theme/components/panel/stickypanel.css';\n\nconst toPx = toUnit( 'px' );\n\n/**\n * The sticky panel view class.\n */\nexport default class StickyPanelView extends View {\n\t/**\n\t * @inheritDoc\n\t */\n\tconstructor( locale ) {\n\t\tsuper( locale );\n\n\t\tconst bind = this.bindTemplate;\n\n\t\t/**\n\t\t * Controls whether the sticky panel should be active.\n\t\t *\n\t\t * @readonly\n\t\t * @observable\n\t\t * @member {Boolean} #isActive\n\t\t */\n\t\tthis.set( 'isActive', false );\n\n\t\t/**\n\t\t * Controls whether the sticky panel is in the \"sticky\" state.\n\t\t *\n\t\t * @readonly\n\t\t * @observable\n\t\t * @member {Boolean} #isSticky\n\t\t */\n\t\tthis.set( 'isSticky', false );\n\n\t\t/**\n\t\t * The limiter element for the sticky panel instance. Its bounding rect limits\n\t\t * the \"stickyness\" of the panel, i.e. when the panel reaches the bottom\n\t\t * edge of the limiter, it becomes sticky to that edge and does not float\n\t\t * off the limiter. It is mandatory for the panel to work properly and once\n\t\t * set, it cannot be changed.\n\t\t *\n\t\t * @readonly\n\t\t * @observable\n\t\t * @member {HTMLElement} #limiterElement\n\t\t */\n\t\tthis.set( 'limiterElement', null );\n\n\t\t/**\n\t\t * The offset from the bottom edge of {@link #limiterElement}\n\t\t * which stops the panel from stickying any further to prevent limiter's content\n\t\t * from being completely covered.\n\t\t *\n\t\t * @readonly\n\t\t * @observable\n\t\t * @default 50\n\t\t * @member {Number} #limiterBottomOffset\n\t\t */\n\t\tthis.set( 'limiterBottomOffset', 50 );\n\n\t\t/**\n\t\t * The offset from the top edge of the web browser's viewport which makes the\n\t\t * panel become sticky. The default value is `0`, which means the panel becomes\n\t\t * sticky when it's upper edge touches the top of the page viewport.\n\t\t *\n\t\t * This attribute is useful when the web page has UI elements positioned to the top\n\t\t * either using `position: fixed` or `position: sticky`, which would cover the\n\t\t * sticky panel or vice–versa (depending on the `z-index` hierarchy).\n\t\t *\n\t\t * @readonly\n\t\t * @observable\n\t\t * @default 0\n\t\t * @member {Number} #viewportTopOffset\n\t\t */\n\t\tthis.set( 'viewportTopOffset', 0 );\n\n\t\t/**\n\t\t * Controls the `margin-left` CSS style of the panel.\n\t\t *\n\t\t * @protected\n\t\t * @readonly\n\t\t * @observable\n\t\t * @member {String} #_marginLeft\n\t\t */\n\t\tthis.set( '_marginLeft', null );\n\n\t\t/**\n\t\t * Set `true` if the sticky panel reached the bottom edge of the\n\t\t * {@link #limiterElement}.\n\t\t *\n\t\t * @protected\n\t\t * @readonly\n\t\t * @observable\n\t\t * @member {Boolean} #_isStickyToTheLimiter\n\t\t */\n\t\tthis.set( '_isStickyToTheLimiter', false );\n\n\t\t/**\n\t\t * Set `true` if the sticky panel uses the {@link #viewportTopOffset},\n\t\t * i.e. not {@link #_isStickyToTheLimiter} and the {@link #viewportTopOffset}\n\t\t * is not `0`.\n\t\t *\n\t\t * @protected\n\t\t * @readonly\n\t\t * @observable\n\t\t * @member {Boolean} #_hasViewportTopOffset\n\t\t */\n\t\tthis.set( '_hasViewportTopOffset', false );\n\n\t\t/**\n\t\t * Collection of the child views which creates balloon panel contents.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:ui/viewcollection~ViewCollection}\n\t\t */\n\t\tthis.content = this.createCollection();\n\n\t\t/**\n\t\t * The DOM bounding client rect of the {@link module:ui/view~View#element} of the panel.\n\t\t *\n\t\t * @protected\n\t\t * @member {Object} #_panelRect\n\t\t */\n\n\t\t/**\n\t\t * The DOM bounding client rect of the {@link #limiterElement}\n\t\t * of the panel.\n\t\t *\n\t\t * @protected\n\t\t * @member {Object} #_limiterRect\n\t\t */\n\n\t\t/**\n\t\t * A dummy element which visually fills the space as long as the\n\t\t * actual panel is sticky. It prevents flickering of the UI.\n\t\t *\n\t\t * @protected\n\t\t * @property {HTMLElement}\n\t\t */\n\t\tthis._contentPanelPlaceholder = new Template( {\n\t\t\ttag: 'div',\n\t\t\tattributes: {\n\t\t\t\tclass: [\n\t\t\t\t\t'ck',\n\t\t\t\t\t'ck-sticky-panel__placeholder'\n\t\t\t\t],\n\t\t\t\tstyle: {\n\t\t\t\t\tdisplay: bind.to( 'isSticky', isSticky => isSticky ? 'block' : 'none' ),\n\t\t\t\t\theight: bind.to( 'isSticky', isSticky => {\n\t\t\t\t\t\treturn isSticky ? toPx( this._panelRect.height ) : null;\n\t\t\t\t\t} )\n\t\t\t\t}\n\t\t\t}\n\t\t} ).render();\n\n\t\t/**\n\t\t * The panel which accepts children into {@link #content} collection.\n\t\t * Also an element which is positioned when {@link #isSticky}.\n\t\t *\n\t\t * @protected\n\t\t * @property {HTMLElement}\n\t\t */\n\t\tthis._contentPanel = new Template( {\n\t\t\ttag: 'div',\n\n\t\t\tattributes: {\n\t\t\t\tclass: [\n\t\t\t\t\t'ck',\n\t\t\t\t\t'ck-sticky-panel__content',\n\t\t\t\t\t// Toggle class of the panel when \"sticky\" state changes in the view.\n\t\t\t\t\tbind.if( 'isSticky', 'ck-sticky-panel__content_sticky' ),\n\t\t\t\t\tbind.if( '_isStickyToTheLimiter', 'ck-sticky-panel__content_sticky_bottom-limit' )\n\t\t\t\t],\n\t\t\t\tstyle: {\n\t\t\t\t\twidth: bind.to( 'isSticky', isSticky => {\n\t\t\t\t\t\treturn isSticky ? toPx( this._contentPanelPlaceholder.getBoundingClientRect().width ) : null;\n\t\t\t\t\t} ),\n\n\t\t\t\t\ttop: bind.to( '_hasViewportTopOffset', _hasViewportTopOffset => {\n\t\t\t\t\t\treturn _hasViewportTopOffset ? toPx( this.viewportTopOffset ) : null;\n\t\t\t\t\t} ),\n\n\t\t\t\t\tbottom: bind.to( '_isStickyToTheLimiter', _isStickyToTheLimiter => {\n\t\t\t\t\t\treturn _isStickyToTheLimiter ? toPx( this.limiterBottomOffset ) : null;\n\t\t\t\t\t} ),\n\n\t\t\t\t\tmarginLeft: bind.to( '_marginLeft' )\n\t\t\t\t}\n\t\t\t},\n\n\t\t\tchildren: this.content\n\t\t} ).render();\n\n\t\tthis.setTemplate( {\n\t\t\ttag: 'div',\n\t\t\tattributes: {\n\t\t\t\tclass: [\n\t\t\t\t\t'ck',\n\t\t\t\t\t'ck-sticky-panel'\n\t\t\t\t]\n\t\t\t},\n\t\t\tchildren: [\n\t\t\t\tthis._contentPanelPlaceholder,\n\t\t\t\tthis._contentPanel\n\t\t\t]\n\t\t} );\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\trender() {\n\t\tsuper.render();\n\n\t\t// Check if the panel should go into the sticky state immediately.\n\t\tthis._checkIfShouldBeSticky();\n\n\t\t// Update sticky state of the panel as the window is being scrolled.\n\t\tthis.listenTo( global.window, 'scroll', () => {\n\t\t\tthis._checkIfShouldBeSticky();\n\t\t} );\n\n\t\t// Synchronize with `model.isActive` because sticking an inactive panel is pointless.\n\t\tthis.listenTo( this, 'change:isActive', () => {\n\t\t\tthis._checkIfShouldBeSticky();\n\t\t} );\n\t}\n\n\t/**\n\t * Analyzes the environment to decide whether the panel should\n\t * be sticky or not.\n\t *\n\t * @protected\n\t */\n\t_checkIfShouldBeSticky() {\n\t\tconst panelRect = this._panelRect = this._contentPanel.getBoundingClientRect();\n\t\tlet limiterRect;\n\n\t\tif ( !this.limiterElement ) {\n\t\t\tthis.isSticky = false;\n\t\t} else {\n\t\t\tlimiterRect = this._limiterRect = this.limiterElement.getBoundingClientRect();\n\n\t\t\t// The panel must be active to become sticky.\n\t\t\tthis.isSticky = this.isActive &&\n\t\t\t\t// The limiter's top edge must be beyond the upper edge of the visible viewport (+the viewportTopOffset).\n\t\t\t\tlimiterRect.top < this.viewportTopOffset &&\n\t\t\t\t// The model#limiterElement's height mustn't be smaller than the panel's height and model#limiterBottomOffset.\n\t\t\t\t// There's no point in entering the sticky mode if the model#limiterElement is very, very small, because\n\t\t\t\t// it would immediately set model#_isStickyToTheLimiter true and, given model#limiterBottomOffset, the panel\n\t\t\t\t// would be positioned before the model#limiterElement.\n\t\t\t\tthis._panelRect.height + this.limiterBottomOffset < limiterRect.height;\n\t\t}\n\n\t\t// Stick the panel to the top edge of the viewport simulating CSS position:sticky.\n\t\t// TODO: Possibly replaced by CSS in the future http://caniuse.com/#feat=css-sticky\n\t\tif ( this.isSticky ) {\n\t\t\tthis._isStickyToTheLimiter =\n\t\t\t\tlimiterRect.bottom < panelRect.height + this.limiterBottomOffset + this.viewportTopOffset;\n\t\t\tthis._hasViewportTopOffset = !this._isStickyToTheLimiter && !!this.viewportTopOffset;\n\t\t\tthis._marginLeft = this._isStickyToTheLimiter ? null : toPx( -global.window.scrollX );\n\t\t}\n\t\t// Detach the panel from the top edge of the viewport.\n\t\telse {\n\t\t\tthis._isStickyToTheLimiter = false;\n\t\t\tthis._hasViewportTopOffset = false;\n\t\t\tthis._marginLeft = null;\n\t\t}\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module utils/dom/tounit\n */\n\n/**\n * Returns a helper function, which adds a desired trailing\n * `unit` to the passed value.\n *\n * @param {String} unit An unit like \"px\" or \"em\".\n * @returns {module:utils/dom/tounit~helper}\n */\nexport default function toUnit( unit ) {\n\t/**\n\t * A function, which adds a pre–defined trailing `unit`\n\t * to the passed `value`.\n\t *\n\t * @function helper\n \t * @param {*} value A value to be given the unit.\n \t * @returns {String} A value with the trailing unit.\n\t */\n\treturn value => value + unit;\n}\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module ui/focuscycler\n */\n\nimport global from '@ckeditor/ckeditor5-utils/src/dom/global';\n\n/**\n * A utility class that helps cycling over focusable {@link module:ui/view~View views} in a\n * {@link module:ui/viewcollection~ViewCollection} when the focus is tracked by the\n * {@link module:utils/focustracker~FocusTracker} instance. It helps implementing keyboard\n * navigation in HTML forms, toolbars, lists and the like.\n *\n * To work properly it requires:\n * * a collection of focusable (HTML `tabindex` attribute) views that implement the `focus()` method,\n * * an associated focus tracker to determine which view is focused.\n *\n * A simple cycler setup can look like this:\n *\n *\t\tconst focusables = new ViewCollection();\n *\t\tconst focusTracker = new FocusTracker();\n *\n *\t\t// Add focusable views to the focus tracker.\n *\t\tfocusTracker.add( ... );\n *\n * Then, the cycler can be used manually:\n *\n *\t\tconst cycler = new FocusCycler( { focusables, focusTracker } );\n *\n *\t\t// Will focus the first focusable view in #focusables.\n *\t\tcycler.focusFirst();\n *\n *\t\t// Will log the next focusable item in #focusables.\n *\t\tconsole.log( cycler.next );\n *\n * Alternatively, it can work side by side with the {@link module:utils/keystrokehandler~KeystrokeHandler}:\n *\n *\t\tconst keystrokeHandler = new KeystrokeHandler();\n *\n *\t\t// Activate the keystroke handler.\n *\t\tkeystrokeHandler.listenTo( sourceOfEvents );\n *\n *\t\tconst cycler = new FocusCycler( {\n *\t\t\tfocusables, focusTracker, keystrokeHandler,\n *\t\t\tactions: {\n *\t\t\t\t// When arrowup of arrowleft is detected by the #keystrokeHandler,\n *\t\t\t\t// focusPrevious() will be called on the cycler.\n *\t\t\t\tfocusPrevious: [ 'arrowup', 'arrowleft' ],\n *\t\t\t}\n *\t\t} );\n *\n * Check out the {@glink framework/guides/deep-dive/ui/focus-tracking \"Deep dive into focus tracking\" guide} to learn more.\n */\nexport default class FocusCycler {\n\t/**\n\t * Creates an instance of the focus cycler utility.\n\t *\n\t * @param {Object} options Configuration options.\n\t * @param {module:utils/collection~Collection|Object} options.focusables\n\t * @param {module:utils/focustracker~FocusTracker} options.focusTracker\n\t * @param {module:utils/keystrokehandler~KeystrokeHandler} [options.keystrokeHandler]\n\t * @param {Object} [options.actions]\n\t */\n\tconstructor( options ) {\n\t\tObject.assign( this, options );\n\n\t\t/**\n\t\t * A {@link module:ui/view~View view} collection that the cycler operates on.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:utils/collection~Collection} #focusables\n\t\t */\n\n\t\t/**\n\t\t * A focus tracker instance that the cycler uses to determine the current focus\n\t\t * state in {@link #focusables}.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:utils/focustracker~FocusTracker} #focusTracker\n\t\t */\n\n\t\t/**\n\t\t * An instance of the {@link module:utils/keystrokehandler~KeystrokeHandler}\n\t\t * which can respond to certain keystrokes and cycle the focus.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:utils/keystrokehandler~KeystrokeHandler} #keystrokeHandler\n\t\t */\n\n\t\t/**\n\t\t * Actions that the cycler can take when a keystroke is pressed. Requires\n\t\t * `options.keystrokeHandler` to be passed and working. When an action is\n\t\t * performed, `preventDefault` and `stopPropagation` will be called on the event\n\t\t * the keystroke fired in the DOM.\n\t\t *\n\t\t *\t\tactions: {\n\t\t *\t\t\t// Will call #focusPrevious() when arrowleft or arrowup is pressed.\n\t\t *\t\t\tfocusPrevious: [ 'arrowleft', 'arrowup' ],\n\t\t *\n\t\t *\t\t\t// Will call #focusNext() when arrowdown is pressed.\n\t\t *\t\t\tfocusNext: 'arrowdown'\n\t\t *\t\t}\n\t\t *\n\t\t * @readonly\n\t\t * @member {Object} #actions\n\t\t */\n\n\t\tif ( options.actions && options.keystrokeHandler ) {\n\t\t\tfor ( const methodName in options.actions ) {\n\t\t\t\tlet actions = options.actions[ methodName ];\n\n\t\t\t\tif ( typeof actions == 'string' ) {\n\t\t\t\t\tactions = [ actions ];\n\t\t\t\t}\n\n\t\t\t\tfor ( const keystroke of actions ) {\n\t\t\t\t\toptions.keystrokeHandler.set( keystroke, ( data, cancel ) => {\n\t\t\t\t\t\tthis[ methodName ]();\n\t\t\t\t\t\tcancel();\n\t\t\t\t\t} );\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\t}\n\n\t/**\n\t * Returns the first focusable view in {@link #focusables}.\n\t * Returns `null` if there is none.\n\t *\n\t * @readonly\n\t * @member {module:ui/view~View|null} #first\n\t */\n\tget first() {\n\t\treturn this.focusables.find( isFocusable ) || null;\n\t}\n\n\t/**\n\t * Returns the last focusable view in {@link #focusables}.\n\t * Returns `null` if there is none.\n\t *\n\t * @readonly\n\t * @member {module:ui/view~View|null} #last\n\t */\n\tget last() {\n\t\treturn this.focusables.filter( isFocusable ).slice( -1 )[ 0 ] || null;\n\t}\n\n\t/**\n\t * Returns the next focusable view in {@link #focusables} based on {@link #current}.\n\t * Returns `null` if there is none.\n\t *\n\t * @readonly\n\t * @member {module:ui/view~View|null} #next\n\t */\n\tget next() {\n\t\treturn this._getFocusableItem( 1 );\n\t}\n\n\t/**\n\t * Returns the previous focusable view in {@link #focusables} based on {@link #current}.\n\t * Returns `null` if there is none.\n\t *\n\t * @readonly\n\t * @member {module:ui/view~View|null} #previous\n\t */\n\tget previous() {\n\t\treturn this._getFocusableItem( -1 );\n\t}\n\n\t/**\n\t * An index of the view in the {@link #focusables} which is focused according\n\t * to {@link #focusTracker}. Returns `null` when there is no such view.\n\t *\n\t * @readonly\n\t * @member {Number|null} #current\n\t */\n\tget current() {\n\t\tlet index = null;\n\n\t\t// There's no focused view in the focusables.\n\t\tif ( this.focusTracker.focusedElement === null ) {\n\t\t\treturn null;\n\t\t}\n\n\t\tthis.focusables.find( ( view, viewIndex ) => {\n\t\t\tconst focused = view.element === this.focusTracker.focusedElement;\n\n\t\t\tif ( focused ) {\n\t\t\t\tindex = viewIndex;\n\t\t\t}\n\n\t\t\treturn focused;\n\t\t} );\n\n\t\treturn index;\n\t}\n\n\t/**\n\t * Focuses the {@link #first} item in {@link #focusables}.\n\t */\n\tfocusFirst() {\n\t\tthis._focus( this.first );\n\t}\n\n\t/**\n\t * Focuses the {@link #last} item in {@link #focusables}.\n\t */\n\tfocusLast() {\n\t\tthis._focus( this.last );\n\t}\n\n\t/**\n\t * Focuses the {@link #next} item in {@link #focusables}.\n\t */\n\tfocusNext() {\n\t\tthis._focus( this.next );\n\t}\n\n\t/**\n\t * Focuses the {@link #previous} item in {@link #focusables}.\n\t */\n\tfocusPrevious() {\n\t\tthis._focus( this.previous );\n\t}\n\n\t/**\n\t * Focuses the given view if it exists.\n\t *\n\t * @protected\n\t * @param {module:ui/view~View} view\n\t */\n\t_focus( view ) {\n\t\tif ( view ) {\n\t\t\tview.focus();\n\t\t}\n\t}\n\n\t/**\n\t * Returns the next or previous focusable view in {@link #focusables} with respect\n\t * to {@link #current}.\n\t *\n\t * @protected\n\t * @param {Number} step Either `1` for checking forward from {@link #current} or\n\t * `-1` for checking backwards.\n\t * @returns {module:ui/view~View|null}\n\t */\n\t_getFocusableItem( step ) {\n\t\t// Cache for speed.\n\t\tconst current = this.current;\n\t\tconst collectionLength = this.focusables.length;\n\n\t\tif ( !collectionLength ) {\n\t\t\treturn null;\n\t\t}\n\n\t\t// Start from the beginning if no view is focused.\n\t\t// https://github.com/ckeditor/ckeditor5-ui/issues/206\n\t\tif ( current === null ) {\n\t\t\treturn this[ step === 1 ? 'first' : 'last' ];\n\t\t}\n\n\t\t// Cycle in both directions.\n\t\tlet index = ( current + collectionLength + step ) % collectionLength;\n\n\t\tdo {\n\t\t\tconst view = this.focusables.get( index );\n\n\t\t\t// TODO: Check if view is visible.\n\t\t\tif ( isFocusable( view ) ) {\n\t\t\t\treturn view;\n\t\t\t}\n\n\t\t\t// Cycle in both directions.\n\t\t\tindex = ( index + collectionLength + step ) % collectionLength;\n\t\t} while ( index !== current );\n\n\t\treturn null;\n\t}\n}\n\n// Checks whether a view is focusable.\n//\n// @private\n// @param {module:ui/view~View} view A view to be checked.\n// @returns {Boolean}\nfunction isFocusable( view ) {\n\treturn !!( view.focus && global.window.getComputedStyle( view.element ).display != 'none' );\n}\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module ui/toolbar/toolbarseparatorview\n */\n\nimport View from '../view';\n\n/**\n * The toolbar separator view class.\n *\n * @extends module:ui/view~View\n */\nexport default class ToolbarSeparatorView extends View {\n\t/**\n\t * @inheritDoc\n\t */\n\tconstructor( locale ) {\n\t\tsuper( locale );\n\n\t\tthis.setTemplate( {\n\t\t\ttag: 'span',\n\t\t\tattributes: {\n\t\t\t\tclass: [\n\t\t\t\t\t'ck',\n\t\t\t\t\t'ck-toolbar__separator'\n\t\t\t\t]\n\t\t\t}\n\t\t} );\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module ui/toolbar/toolbarlinebreakview\n */\n\nimport View from '../view';\n\n/**\n * The toolbar line break view class.\n *\n * @extends module:ui/view~View\n */\nexport default class ToolbarLineBreakView extends View {\n\t/**\n\t * @inheritDoc\n\t */\n\tconstructor( locale ) {\n\t\tsuper( locale );\n\n\t\tthis.setTemplate( {\n\t\t\ttag: 'span',\n\t\t\tattributes: {\n\t\t\t\tclass: [\n\t\t\t\t\t'ck',\n\t\t\t\t\t'ck-toolbar__line-break'\n\t\t\t\t]\n\t\t\t}\n\t\t} );\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module utils/dom/resizeobserver\n */\n\n/* globals setTimeout, clearTimeout */\n\nimport mix from '../mix';\nimport global from './global';\nimport Rect from './rect';\nimport DomEmitterMixin from './emittermixin';\n\nconst RESIZE_CHECK_INTERVAL = 100;\n\n/**\n * A helper class which instances allow performing custom actions when native DOM elements are resized.\n *\n *\t\tconst editableElement = editor.editing.view.getDomRoot();\n *\n *\t\tconst observer = new ResizeObserver( editableElement, entry => {\n *\t\t\tconsole.log( 'The editable element has been resized in DOM.' );\n *\t\t\tconsole.log( entry.target ); // -> editableElement\n *\t\t\tconsole.log( entry.contentRect.width ); // -> e.g. '423px'\n *\t\t} );\n *\n * By default, it uses the [native DOM resize observer](https://developer.mozilla.org/en-US/docs/Web/API/ResizeObserver)\n * under the hood and in browsers that do not support the native API yet, a polyfilled observer is\n * used instead.\n */\nexport default class ResizeObserver {\n\t/**\n\t * Creates an instance of the `ResizeObserver` class.\n\t *\n\t * @param {HTMLElement} element A DOM element that is to be observed for resizing. Note that\n\t * the element must be visible (i.e. not detached from DOM) for the observer to work.\n\t * @param {Function} callback A function called when the observed element was resized. It passes\n\t * the [`ResizeObserverEntry`](https://developer.mozilla.org/en-US/docs/Web/API/ResizeObserverEntry)\n\t * object with information about the resize event.\n\t */\n\tconstructor( element, callback ) {\n\t\t// **Note**: For the maximum performance, this class ensures only a single instance of the native\n\t\t// (or polyfilled) observer is used no matter how many instances of this class were created.\n\t\tif ( !ResizeObserver._observerInstance ) {\n\t\t\tResizeObserver._createObserver();\n\t\t}\n\n\t\t/**\n\t\t * The element observer by this observer.\n\t\t *\n\t\t * @readonly\n\t\t * @private\n\t\t * @member {HTMLElement}\n\t\t */\n\t\tthis._element = element;\n\n\t\t/**\n\t\t * The callback executed each time {@link #_element} is resized.\n\t\t *\n\t\t * @readonly\n\t\t * @private\n\t\t * @member {Function}\n\t\t */\n\t\tthis._callback = callback;\n\n\t\tResizeObserver._addElementCallback( element, callback );\n\t\tResizeObserver._observerInstance.observe( element );\n\t}\n\n\t/**\n\t * Destroys the observer which disables the `callback` passed to the {@link #constructor}.\n\t */\n\tdestroy() {\n\t\tResizeObserver._deleteElementCallback( this._element, this._callback );\n\t}\n\n\t/**\n\t * Registers a new resize callback for the DOM element.\n\t *\n\t * @private\n\t * @static\n\t * @param {HTMLElement} element\n\t * @param {Function} callback\n\t */\n\tstatic _addElementCallback( element, callback ) {\n\t\tif ( !ResizeObserver._elementCallbacks ) {\n\t\t\tResizeObserver._elementCallbacks = new Map();\n\t\t}\n\n\t\tlet callbacks = ResizeObserver._elementCallbacks.get( element );\n\n\t\tif ( !callbacks ) {\n\t\t\tcallbacks = new Set();\n\t\t\tResizeObserver._elementCallbacks.set( element, callbacks );\n\t\t}\n\n\t\tcallbacks.add( callback );\n\t}\n\n\t/**\n\t * Removes a resize callback from the DOM element. If no callbacks are left\n\t * for the element, it removes the element from the native observer.\n\t *\n\t * @private\n\t * @static\n\t * @param {HTMLElement} element\n\t * @param {Function} callback\n\t */\n\tstatic _deleteElementCallback( element, callback ) {\n\t\tconst callbacks = ResizeObserver._getElementCallbacks( element );\n\n\t\t// Remove the element callback. Check if exist first in case someone\n\t\t// called destroy() twice.\n\t\tif ( callbacks ) {\n\t\t\tcallbacks.delete( callback );\n\n\t\t\t// If no callbacks left for the element, also remove the element.\n\t\t\tif ( !callbacks.size ) {\n\t\t\t\tResizeObserver._elementCallbacks.delete( element );\n\t\t\t\tResizeObserver._observerInstance.unobserve( element );\n\t\t\t}\n\t\t}\n\n\t\tif ( ResizeObserver._elementCallbacks && !ResizeObserver._elementCallbacks.size ) {\n\t\t\tResizeObserver._observerInstance = null;\n\t\t\tResizeObserver._elementCallbacks = null;\n\t\t}\n\t}\n\n\t/**\n\t * Returns are registered resize callbacks for the DOM element.\n\t *\n\t * @private\n\t * @static\n\t * @param {HTMLElement} element\n\t * @returns {Set.<HTMLElement>|null}\n\t */\n\tstatic _getElementCallbacks( element ) {\n\t\tif ( !ResizeObserver._elementCallbacks ) {\n\t\t\treturn null;\n\t\t}\n\n\t\treturn ResizeObserver._elementCallbacks.get( element );\n\t}\n\n\t/**\n\t * Creates the single native observer shared across all `ResizeObserver` instances.\n\t * If the browser does not support the native API, it creates a polyfill.\n\t *\n\t * @private\n\t * @static\n\t */\n\tstatic _createObserver() {\n\t\tlet ObserverConstructor;\n\n\t\t// TODO: One day, the `ResizeObserver` API will be supported in all modern web browsers.\n\t\t// When it happens, this module will no longer make sense and should be removed and\n\t\t// the native implementation should be used across the project to save bytes.\n\t\t// Check out https://caniuse.com/#feat=resizeobserver.\n\t\tif ( typeof global.window.ResizeObserver === 'function' ) {\n\t\t\tObserverConstructor = global.window.ResizeObserver;\n\t\t} else {\n\t\t\tObserverConstructor = ResizeObserverPolyfill;\n\t\t}\n\n\t\tResizeObserver._observerInstance = new ObserverConstructor( entries => {\n\t\t\tfor ( const entry of entries ) {\n\t\t\t\tconst callbacks = ResizeObserver._getElementCallbacks( entry.target );\n\n\t\t\t\tif ( callbacks ) {\n\t\t\t\t\tfor ( const callback of callbacks ) {\n\t\t\t\t\t\tcallback( entry );\n\t\t\t\t\t}\n\t\t\t\t}\n\t\t\t}\n\t\t} );\n\t}\n}\n\n/**\n * The single native observer instance (or polyfill in browsers that do not support the API)\n * shared across all {@link module:utils/dom/resizeobserver~ResizeObserver} instances.\n *\n * @static\n * @protected\n * @readonly\n * @property {Object|null} module:utils/dom/resizeobserver~ResizeObserver#_observerInstance\n */\nResizeObserver._observerInstance = null;\n\n/**\n * A mapping of native DOM elements and their callbacks shared across all\n * {@link module:utils/dom/resizeobserver~ResizeObserver} instances.\n *\n * @static\n * @private\n * @readonly\n * @property {Map.<HTMLElement,Set>|null} module:utils/dom/resizeobserver~ResizeObserver#_elementCallbacks\n */\nResizeObserver._elementCallbacks = null;\n\n/**\n * A polyfill class for the native [`ResizeObserver`](https://developer.mozilla.org/en-US/docs/Web/API/ResizeObserver).\n *\n * @private\n * @mixes module:utils/domemittermixin~DomEmitterMixin\n */\nclass ResizeObserverPolyfill {\n\t/**\n\t * Creates an instance of the {@link module:utils/dom/resizeobserver~ResizeObserverPolyfill} class.\n\t *\n\t * It synchronously reacts to resize of the window to check if observed elements' geometry changed.\n\t *\n\t * Additionally, the polyfilled observer uses a timeout to check if observed elements' geometry has changed\n\t * in some other way (dynamic layouts, scrollbars showing up, etc.), so its response can also be asynchronous.\n\t *\n\t * @param {Function} callback A function called when any observed element was resized. Refer to the\n\t * native [`ResizeObserver`](https://developer.mozilla.org/en-US/docs/Web/API/ResizeObserver) API to\n\t * learn more.\n\t */\n\tconstructor( callback ) {\n\t\t/**\n\t\t * A function called when any observed {@link #_elements element} was resized.\n\t\t *\n\t\t * @readonly\n\t\t * @protected\n\t\t * @member {Function}\n\t\t */\n\t\tthis._callback = callback;\n\n\t\t/**\n\t\t * DOM elements currently observed by the observer instance.\n\t\t *\n\t\t * @readonly\n\t\t * @protected\n\t\t * @member {Set}\n\t\t */\n\t\tthis._elements = new Set();\n\n\t\t/**\n\t\t * Cached DOM {@link #_elements elements} bounding rects to compare to upon the next check.\n\t\t *\n\t\t * @readonly\n\t\t * @protected\n\t\t * @member {Map.<HTMLElement,module:utils/dom/rect~Rect>}\n\t\t */\n\t\tthis._previousRects = new Map();\n\n\t\t/**\n\t\t * An UID of the current timeout upon which the observed elements rects\n\t\t * will be compared to the {@link #_previousRects previous rects} from the past.\n\t\t *\n\t\t * @readonly\n\t\t * @protected\n\t\t * @member {Map.<HTMLElement,module:utils/dom/rect~Rect>}\n\t\t */\n\t\tthis._periodicCheckTimeout = null;\n\t}\n\n\t/**\n\t * Starts observing a DOM element.\n\t *\n\t * Learn more in the\n\t * [native method documentation](https://developer.mozilla.org/en-US/docs/Web/API/ResizeObserver/observe).\n\t *\n\t * @param {HTMLElement} element\n\t */\n\tobserve( element ) {\n\t\tthis._elements.add( element );\n\n\t\tthis._checkElementRectsAndExecuteCallback();\n\n\t\tif ( this._elements.size === 1 ) {\n\t\t\tthis._startPeriodicCheck();\n\t\t}\n\t}\n\n\t/**\n\t * Stops observing a DOM element.\n\t *\n\t * Learn more in the\n\t * [native method documentation](https://developer.mozilla.org/en-US/docs/Web/API/ResizeObserver/unobserve).\n\t *\n\t * @param {HTMLElement} element\n\t */\n\tunobserve( element ) {\n\t\tthis._elements.delete( element );\n\t\tthis._previousRects.delete( element );\n\n\t\tif ( !this._elements.size ) {\n\t\t\tthis._stopPeriodicCheck();\n\t\t}\n\t}\n\n\t/**\n\t * When called, the observer calls the {@link #_callback resize callback} for all observed\n\t * {@link #_elements elements} but also starts checking periodically for changes in the elements' geometry.\n\t * If some are detected, {@link #_callback resize callback} is called for relevant elements that were resized.\n\t *\n\t * @protected\n\t */\n\t_startPeriodicCheck() {\n\t\tconst periodicCheck = () => {\n\t\t\tthis._checkElementRectsAndExecuteCallback();\n\t\t\tthis._periodicCheckTimeout = setTimeout( periodicCheck, RESIZE_CHECK_INTERVAL );\n\t\t};\n\n\t\tthis.listenTo( global.window, 'resize', () => {\n\t\t\tthis._checkElementRectsAndExecuteCallback();\n\t\t} );\n\n\t\tthis._periodicCheckTimeout = setTimeout( periodicCheck, RESIZE_CHECK_INTERVAL );\n\t}\n\n\t/**\n\t * Stops checking for changes in all observed {@link #_elements elements} geometry.\n\t *\n\t * @protected\n\t */\n\t_stopPeriodicCheck() {\n\t\tclearTimeout( this._periodicCheckTimeout );\n\t\tthis.stopListening();\n\t\tthis._previousRects.clear();\n\t}\n\n\t/**\n\t * Checks if the geometry of any of the {@link #_elements element} has changed. If so, executes\n\t * the {@link #_callback resize callback} with element geometry data.\n\t *\n\t * @protected\n\t */\n\t_checkElementRectsAndExecuteCallback() {\n\t\tconst entries = [];\n\n\t\tfor ( const element of this._elements ) {\n\t\t\tif ( this._hasRectChanged( element ) ) {\n\t\t\t\tentries.push( {\n\t\t\t\t\ttarget: element,\n\t\t\t\t\tcontentRect: this._previousRects.get( element )\n\t\t\t\t} );\n\t\t\t}\n\t\t}\n\n\t\tif ( entries.length ) {\n\t\t\tthis._callback( entries );\n\t\t}\n\t}\n\n\t/**\n\t * Compares the DOM element geometry to the {@link #_previousRects cached geometry} from the past.\n\t * Returns `true` if geometry has changed or the element is checked for the first time.\n\t *\n\t * @protected\n\t * @param {HTMLElement} element\n\t * @returns {Boolean}\n\t */\n\t_hasRectChanged( element ) {\n\t\tif ( !element.ownerDocument.body.contains( element ) ) {\n\t\t\treturn false;\n\t\t}\n\n\t\tconst currentRect = new Rect( element );\n\t\tconst previousRect = this._previousRects.get( element );\n\n\t\t// The first check should always yield true despite no Previous rect to compare to.\n\t\t// The native ResizeObserver does that and... that makes sense. Sort of.\n\t\tconst hasChanged = !previousRect || !previousRect.isEqual( currentRect );\n\n\t\tthis._previousRects.set( element, currentRect );\n\n\t\treturn hasChanged;\n\t}\n}\n\nmix( ResizeObserverPolyfill, DomEmitterMixin );\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module ui/dropdown/dropdownpanelview\n */\n\nimport View from '../view';\n\n/**\n * The dropdown panel view class.\n *\n * See {@link module:ui/dropdown/dropdownview~DropdownView} to learn about the common usage.\n *\n * @extends module:ui/view~View\n */\nexport default class DropdownPanelView extends View {\n\t/**\n\t * @inheritDoc\n\t */\n\tconstructor( locale ) {\n\t\tsuper( locale );\n\n\t\tconst bind = this.bindTemplate;\n\n\t\t/**\n\t\t * Controls whether the panel is visible.\n\t\t *\n\t\t * @observable\n\t\t * @member {Boolean} #isVisible\n\t\t */\n\t\tthis.set( 'isVisible', false );\n\n\t\t/**\n\t\t * The position of the panel, relative to the parent.\n\t\t *\n\t\t * This property is reflected in the CSS class set to {@link #element} that controls\n\t\t * the position of the panel.\n\t\t *\n\t\t * @observable\n\t\t * @default 'se'\n\t\t * @member {'se'|'sw'|'ne'|'nw'} #position\n\t\t */\n\t\tthis.set( 'position', 'se' );\n\n\t\t/**\n\t\t * Collection of the child views in this panel.\n\t\t *\n\t\t * A common child type is the {@link module:ui/list/listview~ListView} and {@link module:ui/toolbar/toolbarview~ToolbarView}.\n\t\t * See {@link module:ui/dropdown/utils~addListToDropdown} and\n\t\t * {@link module:ui/dropdown/utils~addToolbarToDropdown} to learn more about child views of dropdowns.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:ui/viewcollection~ViewCollection}\n\t\t */\n\t\tthis.children = this.createCollection();\n\n\t\tthis.setTemplate( {\n\t\t\ttag: 'div',\n\n\t\t\tattributes: {\n\t\t\t\tclass: [\n\t\t\t\t\t'ck',\n\t\t\t\t\t'ck-reset',\n\t\t\t\t\t'ck-dropdown__panel',\n\t\t\t\t\tbind.to( 'position', value => `ck-dropdown__panel_${ value }` ),\n\t\t\t\t\tbind.if( 'isVisible', 'ck-dropdown__panel-visible' )\n\t\t\t\t]\n\t\t\t},\n\n\t\t\tchildren: this.children,\n\n\t\t\ton: {\n\t\t\t\t// Drag and drop in the panel should not break the selection in the editor.\n\t\t\t\t// https://github.com/ckeditor/ckeditor5-ui/issues/228\n\t\t\t\tselectstart: bind.to( evt => evt.preventDefault() )\n\t\t\t}\n\t\t} );\n\t}\n\n\t/**\n\t * Focuses the view element or first item in view collection on opening dropdown's panel.\n\t *\n\t * See also {@link module:ui/dropdown/dropdownpanelfocusable~DropdownPanelFocusable}.\n\t */\n\tfocus() {\n\t\tif ( this.children.length ) {\n\t\t\tthis.children.first.focus();\n\t\t}\n\t}\n\n\t/**\n\t * Focuses the view element or last item in view collection on opening dropdown's panel.\n\t *\n\t * See also {@link module:ui/dropdown/dropdownpanelfocusable~DropdownPanelFocusable}.\n\t */\n\tfocusLast() {\n\t\tif ( this.children.length ) {\n\t\t\tconst lastChild = this.children.last;\n\n\t\t\tif ( typeof lastChild.focusLast === 'function' ) {\n\t\t\t\tlastChild.focusLast();\n\t\t\t} else {\n\t\t\t\tlastChild.focus();\n\t\t\t}\n\t\t}\n\t}\n}\n","import api from \"!../../../../../style-loader/dist/runtime/injectStylesIntoStyleTag.js\";\n            import content from \"!!../../../../../css-loader/dist/cjs.js!../../../../../postcss-loader/dist/cjs.js??ref--5-2!./dropdown.css\";\n\nvar options = {\"injectType\":\"singletonStyleTag\",\"attributes\":{\"data-cke\":true}};\n\noptions.insert = \"head\";\noptions.singleton = true;\n\nvar update = api(content, options);\n\n\n\nexport default content.locals || {};","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module utils/dom/position\n */\n\nimport global from './global';\nimport Rect from './rect';\nimport getPositionedAncestor from './getpositionedancestor';\nimport getBorderWidths from './getborderwidths';\nimport { isFunction } from 'lodash-es';\n\n/**\n * Calculates the `position: absolute` coordinates of a given element so it can be positioned with respect to the\n * target in the visually most efficient way, taking various restrictions like viewport or limiter geometry\n * into consideration.\n *\n *\t\t// The element which is to be positioned.\n *\t\tconst element = document.body.querySelector( '#toolbar' );\n *\n *\t\t// A target to which the element is positioned relatively.\n *\t\tconst target = document.body.querySelector( '#container' );\n *\n *\t\t// Finding the optimal coordinates for the positioning.\n *\t\tconst { left, top, name } = getOptimalPosition( {\n *\t\t\telement: element,\n *\t\t\ttarget: target,\n *\n * \t\t\t// The algorithm will chose among these positions to meet the requirements such\n * \t\t\t// as \"limiter\" element or \"fitInViewport\", set below. The positions are considered\n * \t\t\t// in the order of the array.\n *\t\t\tpositions: [\n *\t\t\t\t//\n *\t\t\t \t//\t[ Target ]\n *\t\t\t\t//\t+-----------------+\n *\t\t\t\t//\t|     Element     |\n *\t\t\t\t//\t+-----------------+\n *\t\t\t\t//\n *\t\t\t\ttargetRect => ( {\n *\t\t\t\t\ttop: targetRect.bottom,\n *\t\t\t\t\tleft: targetRect.left,\n *\t\t\t\t\tname: 'mySouthEastPosition'\n *\t\t\t\t} ),\n *\n *\t\t\t\t//\n *\t\t\t\t//\t+-----------------+\n *\t\t\t\t//\t|     Element     |\n *\t\t\t\t//\t+-----------------+\n *\t\t\t\t//\t[ Target ]\n *\t\t\t\t//\n *\t\t\t\t( targetRect, elementRect ) => ( {\n *\t\t\t\t\ttop: targetRect.top - elementRect.height,\n *\t\t\t\t\tleft: targetRect.left,\n *\t\t\t\t\tname: 'myNorthEastPosition'\n *\t\t\t\t} )\n *\t\t\t],\n *\n *\t\t\t// Find a position such guarantees the element remains within visible boundaries of <body>.\n *\t\t\tlimiter: document.body,\n *\n *\t\t\t// Find a position such guarantees the element remains within visible boundaries of the browser viewport.\n *\t\t\tfitInViewport: true\n *\t\t} );\n *\n *\t\t// The best position which fits into document.body and the viewport. May be useful\n *\t\t// to set proper class on the `element`.\n *\t\tconsole.log( name ); // -> \"myNorthEastPosition\"\n *\n *\t\t// Using the absolute coordinates which has been found to position the element\n *\t\t// as in the diagram depicting the \"myNorthEastPosition\" position.\n *\t\telement.style.top = top;\n *\t\telement.style.left = left;\n *\n * @param {module:utils/dom/position~Options} options Positioning options object.\n * @returns {module:utils/dom/position~Position}\n */\nexport function getOptimalPosition( { element, target, positions, limiter, fitInViewport } ) {\n\t// If the {@link module:utils/dom/position~Options#target} is a function, use what it returns.\n\t// https://github.com/ckeditor/ckeditor5-utils/issues/157\n\tif ( isFunction( target ) ) {\n\t\ttarget = target();\n\t}\n\n\t// If the {@link module:utils/dom/position~Options#limiter} is a function, use what it returns.\n\t// https://github.com/ckeditor/ckeditor5-ui/issues/260\n\tif ( isFunction( limiter ) ) {\n\t\tlimiter = limiter();\n\t}\n\n\tconst positionedElementAncestor = getPositionedAncestor( element );\n\tconst elementRect = new Rect( element );\n\tconst targetRect = new Rect( target );\n\n\tlet bestPositionRect;\n\tlet bestPositionName;\n\n\t// If there are no limits, just grab the very first position and be done with that drama.\n\tif ( !limiter && !fitInViewport ) {\n\t\t[ bestPositionName, bestPositionRect ] = getPositionNameAndRect( positions[ 0 ], targetRect, elementRect );\n\t} else {\n\t\tconst limiterRect = limiter && new Rect( limiter ).getVisible();\n\t\tconst viewportRect = fitInViewport && new Rect( global.window );\n\t\tconst bestPosition = getBestPositionNameAndRect( positions, { targetRect, elementRect, limiterRect, viewportRect } );\n\n\t\t// If there's no best position found, i.e. when all intersections have no area because\n\t\t// rects have no width or height, then just use the first available position.\n\t\t[ bestPositionName, bestPositionRect ] = bestPosition || getPositionNameAndRect( positions[ 0 ], targetRect, elementRect );\n\t}\n\n\tlet absoluteRectCoordinates = getAbsoluteRectCoordinates( bestPositionRect );\n\n\tif ( positionedElementAncestor ) {\n\t\tabsoluteRectCoordinates = shiftRectCoordinatesDueToPositionedAncestor( absoluteRectCoordinates, positionedElementAncestor );\n\t}\n\n\treturn {\n\t\tleft: absoluteRectCoordinates.left,\n\t\ttop: absoluteRectCoordinates.top,\n\t\tname: bestPositionName\n\t};\n}\n\n// For given position function, returns a corresponding `Rect` instance.\n//\n// @private\n// @param {Function} position A function returning {@link module:utils/dom/position~Position}.\n// @param {utils/dom/rect~Rect} targetRect A rect of the target.\n// @param {utils/dom/rect~Rect} elementRect A rect of positioned element.\n// @returns {Array|null} An array containing position name and its Rect (or null if position should be ignored).\nfunction getPositionNameAndRect( position, targetRect, elementRect ) {\n\tconst positionData = position( targetRect, elementRect );\n\n\tif ( !positionData ) {\n\t\treturn null;\n\t}\n\n\tconst { left, top, name } = positionData;\n\n\treturn [ name, elementRect.clone().moveTo( left, top ) ];\n}\n\n// For a given array of positioning functions, returns such that provides the best\n// fit of the `elementRect` into the `limiterRect` and `viewportRect`.\n//\n// @private\n//\n// @param {Object} options\n// @param {module:utils/dom/position~Options#positions} positions Functions returning {@link module:utils/dom/position~Position}\n// to be checked, in the order of preference.\n// @param {Object} options\n// @param {utils/dom/rect~Rect} options.targetRect A rect of the {@link module:utils/dom/position~Options#target}.\n// @param {utils/dom/rect~Rect} options.elementRect A rect of positioned {@link module:utils/dom/position~Options#element}.\n// @param {utils/dom/rect~Rect} options.limiterRect A rect of the {@link module:utils/dom/position~Options#limiter}.\n// @param {utils/dom/rect~Rect} options.viewportRect A rect of the viewport.\n//\n// @returns {Array} An array containing the name of the position and it's rect.\nfunction getBestPositionNameAndRect( positions, options ) {\n\tconst { elementRect, viewportRect } = options;\n\n\t// This is when element is fully visible.\n\tconst elementRectArea = elementRect.getArea();\n\n\t// Let's calculate intersection areas for positions. It will end early if best match is found.\n\tconst processedPositions = processPositionsToAreas( positions, options );\n\n\t// First let's check all positions that fully fit in the viewport.\n\tif ( viewportRect ) {\n\t\tconst processedPositionsInViewport = processedPositions.filter( ( { viewportIntersectArea } ) => {\n\t\t\treturn viewportIntersectArea === elementRectArea;\n\t\t} );\n\n\t\t// Try to find best position from those which fit completely in viewport.\n\t\tconst bestPositionData = getBestOfProcessedPositions( processedPositionsInViewport, elementRectArea );\n\n\t\tif ( bestPositionData ) {\n\t\t\treturn bestPositionData;\n\t\t}\n\t}\n\n\t// Either there is no viewportRect or there is no position that fits completely in the viewport.\n\treturn getBestOfProcessedPositions( processedPositions, elementRectArea );\n}\n\n// For a given array of positioning functions, calculates intersection areas for them.\n//\n// Note: If some position fully fits into the `limiterRect`, it will be returned early, without further consideration\n// of other positions.\n//\n// @private\n//\n// @param {module:utils/dom/position~Options#positions} positions Functions returning {@link module:utils/dom/position~Position}\n// to be checked, in the order of preference.\n// @param {Object} options\n// @param {utils/dom/rect~Rect} options.targetRect A rect of the {@link module:utils/dom/position~Options#target}.\n// @param {utils/dom/rect~Rect} options.elementRect A rect of positioned {@link module:utils/dom/position~Options#element}.\n// @param {utils/dom/rect~Rect} options.limiterRect A rect of the {@link module:utils/dom/position~Options#limiter}.\n// @param {utils/dom/rect~Rect} options.viewportRect A rect of the viewport.\n//\n// @returns {Array.<Object>} Array of positions with calculated intersection areas. Each item is an object containing:\n// * {String} positionName Name of position.\n// * {utils/dom/rect~Rect} positionRect Rect of position.\n// * {Number} limiterIntersectArea Area of intersection of the position with limiter part that is in the viewport.\n// * {Number} viewportIntersectArea Area of intersection of the position with viewport.\nfunction processPositionsToAreas( positions, { targetRect, elementRect, limiterRect, viewportRect } ) {\n\tconst processedPositions = [];\n\n\t// This is when element is fully visible.\n\tconst elementRectArea = elementRect.getArea();\n\n\tfor ( const position of positions ) {\n\t\tconst positionData = getPositionNameAndRect( position, targetRect, elementRect );\n\n\t\tif ( !positionData ) {\n\t\t\tcontinue;\n\t\t}\n\n\t\tconst [ positionName, positionRect ] = positionData;\n\t\tlet limiterIntersectArea = 0;\n\t\tlet viewportIntersectArea = 0;\n\n\t\tif ( limiterRect ) {\n\t\t\tif ( viewportRect ) {\n\t\t\t\t// Consider only the part of the limiter which is visible in the viewport. So the limiter is getting limited.\n\t\t\t\tconst limiterViewportIntersectRect = limiterRect.getIntersection( viewportRect );\n\n\t\t\t\tif ( limiterViewportIntersectRect ) {\n\t\t\t\t\t// If the limiter is within the viewport, then check the intersection between that part of the\n\t\t\t\t\t// limiter and actual position.\n\t\t\t\t\tlimiterIntersectArea = limiterViewportIntersectRect.getIntersectionArea( positionRect );\n\t\t\t\t}\n\t\t\t} else {\n\t\t\t\tlimiterIntersectArea = limiterRect.getIntersectionArea( positionRect );\n\t\t\t}\n\t\t}\n\n\t\tif ( viewportRect ) {\n\t\t\tviewportIntersectArea = viewportRect.getIntersectionArea( positionRect );\n\t\t}\n\n\t\tconst processedPosition = {\n\t\t\tpositionName,\n\t\t\tpositionRect,\n\t\t\tlimiterIntersectArea,\n\t\t\tviewportIntersectArea\n\t\t};\n\n\t\t// If a such position is found that element is fully contained by the limiter then, obviously,\n\t\t// there will be no better one, so finishing.\n\t\tif ( limiterIntersectArea === elementRectArea ) {\n\t\t\treturn [ processedPosition ];\n\t\t}\n\n\t\tprocessedPositions.push( processedPosition );\n\t}\n\n\treturn processedPositions;\n}\n\n// For a given array of processed position data (with calculated Rects for positions and intersection areas)\n// returns such that provides the best fit of the `elementRect` into the `limiterRect` and `viewportRect` at the same time.\n//\n// **Note**: It will return early if some position fully fits into the `limiterRect`.\n//\n// @private\n// @param {Array.<Object>} Array of positions with calculated intersection areas (in order of preference).\n// Each item is an object containing:\n//\n//\t* {String} positionName Name of position.\n//\t* {utils/dom/rect~Rect} positionRect Rect of position.\n//\t* {Number} limiterIntersectArea Area of intersection of the position with limiter part that is in the viewport.\n//\t* {Number} viewportIntersectArea Area of intersection of the position with viewport.\n//\n// @param {Number} elementRectArea Area of positioned {@link module:utils/dom/position~Options#element}.\n// @returns {Array|null} An array containing the name of the position and it's rect, or null if not found.\nfunction getBestOfProcessedPositions( processedPositions, elementRectArea ) {\n\tlet maxFitFactor = 0;\n\tlet bestPositionRect;\n\tlet bestPositionName;\n\n\tfor ( const { positionName, positionRect, limiterIntersectArea, viewportIntersectArea } of processedPositions ) {\n\t\t// If a such position is found that element is fully container by the limiter then, obviously,\n\t\t// there will be no better one, so finishing.\n\t\tif ( limiterIntersectArea === elementRectArea ) {\n\t\t\treturn [ positionName, positionRect ];\n\t\t}\n\n\t\t// To maximize both viewport and limiter intersection areas we use distance on viewportIntersectArea\n\t\t// and limiterIntersectArea plane (without sqrt because we are looking for max value).\n\t\tconst fitFactor = viewportIntersectArea ** 2 + limiterIntersectArea ** 2;\n\n\t\tif ( fitFactor > maxFitFactor ) {\n\t\t\tmaxFitFactor = fitFactor;\n\t\t\tbestPositionRect = positionRect;\n\t\t\tbestPositionName = positionName;\n\t\t}\n\t}\n\n\treturn bestPositionRect ? [ bestPositionName, bestPositionRect ] : null;\n}\n\n// For a given absolute Rect coordinates object and a positioned element ancestor, it returns an object with\n// new Rect coordinates that make up for the position and the scroll of the ancestor.\n//\n// This is necessary because while Rects (and DOMRects) are relative to the browser's viewport, their coordinates\n// are used in real–life to position elements with `position: absolute`, which are scoped by any positioned\n// (and scrollable) ancestors.\n//\n// @private\n//\n// @param {Object} absoluteRectCoordinates An object with absolute rect coordinates.\n// @param {Object} absoluteRectCoordinates.top\n// @param {Object} absoluteRectCoordinates.left\n// @param {HTMLElement} positionedElementAncestor An ancestor element that should be considered.\n//\n// @returns {Object} An object corresponding to `absoluteRectCoordinates` input but with values shifted\n// to make up for the positioned element ancestor.\nfunction shiftRectCoordinatesDueToPositionedAncestor( { left, top }, positionedElementAncestor ) {\n\tconst ancestorPosition = getAbsoluteRectCoordinates( new Rect( positionedElementAncestor ) );\n\tconst ancestorBorderWidths = getBorderWidths( positionedElementAncestor );\n\n\t// (https://github.com/ckeditor/ckeditor5-ui-default/issues/126)\n\t// If there's some positioned ancestor of the panel, then its `Rect` must be taken into\n\t// consideration. `Rect` is always relative to the viewport while `position: absolute` works\n\t// with respect to that positioned ancestor.\n\tleft -= ancestorPosition.left;\n\ttop -= ancestorPosition.top;\n\n\t// (https://github.com/ckeditor/ckeditor5-utils/issues/139)\n\t// If there's some positioned ancestor of the panel, not only its position must be taken into\n\t// consideration (see above) but also its internal scrolls. Scroll have an impact here because `Rect`\n\t// is relative to the viewport (it doesn't care about scrolling), while `position: absolute`\n\t// must compensate that scrolling.\n\tleft += positionedElementAncestor.scrollLeft;\n\ttop += positionedElementAncestor.scrollTop;\n\n\t// (https://github.com/ckeditor/ckeditor5-utils/issues/139)\n\t// If there's some positioned ancestor of the panel, then its `Rect` includes its CSS `borderWidth`\n\t// while `position: absolute` positioning does not consider it.\n\t// E.g. `{ position: absolute, top: 0, left: 0 }` means upper left corner of the element,\n\t// not upper-left corner of its border.\n\tleft -= ancestorBorderWidths.left;\n\ttop -= ancestorBorderWidths.top;\n\n\treturn { left, top };\n}\n\n// DOMRect (also Rect) works in a scroll–independent geometry but `position: absolute` doesn't.\n// This function converts Rect to `position: absolute` coordinates.\n//\n// @private\n// @param {utils/dom/rect~Rect} rect A rect to be converted.\n// @returns {Object} Object containing `left` and `top` properties, in absolute coordinates.\nfunction getAbsoluteRectCoordinates( { left, top } ) {\n\tconst { scrollX, scrollY } = global.window;\n\n\treturn {\n\t\tleft: left + scrollX,\n\t\ttop: top + scrollY\n\t};\n}\n\n/**\n * The `getOptimalPosition()` helper options.\n *\n * @interface module:utils/dom/position~Options\n */\n\n/**\n * Element that is to be positioned.\n *\n * @member {HTMLElement} #element\n */\n\n/**\n * Target with respect to which the `element` is to be positioned.\n *\n * @member {HTMLElement|Range|ClientRect|Rect|Function} #target\n */\n\n/**\n * An array of functions which return {@link module:utils/dom/position~Position} relative\n * to the `target`, in the order of preference.\n *\n * **Note**: If a function returns `null`, it is ignored by the `getOptimalPosition()`.\n *\n * @member {Array.<Function>} #positions\n */\n\n/**\n * When set, the algorithm will chose position which fits the most in the\n * limiter's bounding rect.\n *\n * @member {HTMLElement|Range|ClientRect|Rect|Function} #limiter\n */\n\n/**\n * When set, the algorithm will chose such a position which fits `element`\n * the most inside visible viewport.\n *\n * @member {Boolean} #fitInViewport\n */\n\n/**\n * An object describing a position in `position: absolute` coordinate\n * system, along with position name.\n *\n * @typedef {Object} module:utils/dom/position~Position\n *\n * @property {Number} top Top position offset.\n * @property {Number} left Left position offset.\n * @property {String} name Name of the position.\n */\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module ui/dropdown/dropdownview\n */\n\nimport View from '../view';\nimport KeystrokeHandler from '@ckeditor/ckeditor5-utils/src/keystrokehandler';\n\nimport '../../theme/components/dropdown/dropdown.css';\n\nimport { getOptimalPosition } from '@ckeditor/ckeditor5-utils/src/dom/position';\n\n/**\n * The dropdown view class. It manages the dropdown button and dropdown panel.\n *\n * In most cases, the easiest way to create a dropdown is by using the {@link module:ui/dropdown/utils~createDropdown}\n * util:\n *\n *\t\tconst dropdown = createDropdown( locale );\n *\n *\t\t// Configure dropdown's button properties:\n *\t\tdropdown.buttonView.set( {\n *\t\t\tlabel: 'A dropdown',\n *\t\t\twithText: true\n *\t\t} );\n *\n *\t\tdropdown.render();\n *\n *\t\tdropdown.panelView.element.textContent = 'Content of the panel';\n *\n *\t\t// Will render a dropdown with a panel containing a \"Content of the panel\" text.\n *\t\tdocument.body.appendChild( dropdown.element );\n *\n * If you want to add a richer content to the dropdown panel, you can use the {@link module:ui/dropdown/utils~addListToDropdown}\n * and {@link module:ui/dropdown/utils~addToolbarToDropdown} helpers. See more examples in\n * {@link module:ui/dropdown/utils~createDropdown} documentation.\n *\n * If you want to create a completely custom dropdown, then you can compose it manually:\n *\n *\t\tconst button = new DropdownButtonView( locale );\n *\t\tconst panel = new DropdownPanelView( locale );\n *\t\tconst dropdown = new DropdownView( locale, button, panel );\n *\n *\t\tbutton.set( {\n *\t\t\tlabel: 'A dropdown',\n *\t\t\twithText: true\n *\t\t} );\n *\n *\t\tdropdown.render();\n *\n *\t\tpanel.element.textContent = 'Content of the panel';\n *\n *\t\t// Will render a dropdown with a panel containing a \"Content of the panel\" text.\n *\t\tdocument.body.appendChild( dropdown.element );\n *\n * However, dropdown created this way will contain little behavior. You will need to implement handlers for actions\n * such as {@link module:ui/bindings/clickoutsidehandler~clickOutsideHandler clicking outside an open dropdown}\n * (which should close it) and support for arrow keys inside the panel. Therefore, unless you really know what\n * you do and you really need to do it, it is recommended to use the {@link module:ui/dropdown/utils~createDropdown} helper.\n *\n * @extends module:ui/view~View\n */\nexport default class DropdownView extends View {\n\t/**\n\t * Creates an instance of the dropdown.\n\t *\n\t * Also see {@link #render}.\n\t *\n\t * @param {module:utils/locale~Locale} [locale] The localization services instance.\n\t * @param {module:ui/dropdown/button/dropdownbutton~DropdownButton} buttonView\n\t * @param {module:ui/dropdown/dropdownpanelview~DropdownPanelView} panelView\n\t */\n\tconstructor( locale, buttonView, panelView ) {\n\t\tsuper( locale );\n\n\t\tconst bind = this.bindTemplate;\n\n\t\t/**\n\t\t * Button of the dropdown view. Clicking the button opens the {@link #panelView}.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:ui/button/buttonview~ButtonView} #buttonView\n\t\t */\n\t\tthis.buttonView = buttonView;\n\n\t\t/**\n\t\t * Panel of the dropdown. It opens when the {@link #buttonView} is\n\t\t * {@link module:ui/button/buttonview~ButtonView#event:execute executed} (i.e. clicked).\n\t\t *\n\t\t * Child views can be added to the panel's `children` collection:\n\t\t *\n\t\t *\t\tdropdown.panelView.children.add( childView );\n\t\t *\n\t\t * See {@link module:ui/dropdown/dropdownpanelview~DropdownPanelView#children} and\n\t\t * {@link module:ui/viewcollection~ViewCollection#add}.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:ui/dropdown/dropdownpanelview~DropdownPanelView} #panelView\n\t\t */\n\t\tthis.panelView = panelView;\n\n\t\t/**\n\t\t * Controls whether the dropdown view is open, i.e. shows or hides the {@link #panelView panel}.\n\t\t *\n\t\t * @observable\n\t\t * @member {Boolean} #isOpen\n\t\t */\n\t\tthis.set( 'isOpen', false );\n\n\t\t/**\n\t\t * Controls whether the dropdown is enabled, i.e. it can be clicked and execute an action.\n\t\t *\n\t\t * See {@link module:ui/button/buttonview~ButtonView#isEnabled}.\n\t\t *\n\t\t * @observable\n\t\t * @member {Boolean} #isEnabled\n\t\t */\n\t\tthis.set( 'isEnabled', true );\n\n\t\t/**\n\t\t * (Optional) The additional CSS class set on the dropdown {@link #element}.\n\t\t *\n\t\t * @observable\n\t\t * @member {String} #class\n\t\t */\n\t\tthis.set( 'class' );\n\n\t\t/**\n\t\t * (Optional) The `id` attribute of the dropdown (i.e. to pair with a `<label>` element).\n\t\t *\n\t\t * @observable\n\t\t * @member {String} #id\n\t\t */\n\t\tthis.set( 'id' );\n\n\t\t/**\n\t\t * The position of the panel, relative to the dropdown.\n\t\t *\n\t\t * **Note**: When `'auto'`, the panel will use one of the remaining positions to stay\n\t\t * in the viewport, visible to the user. The positions correspond directly to\n\t\t * {@link module:ui/dropdown/dropdownview~DropdownView.defaultPanelPositions default panel positions}.\n\t\t *\n\t\t * **Note**: This value has an impact on the\n\t\t * {@link module:ui/dropdown/dropdownpanelview~DropdownPanelView#position} property\n\t\t * each time the panel becomes {@link #isOpen open}.\n\t\t *\n\t\t * @observable\n\t\t * @default 'auto'\n\t\t * @member {'auto'|'se'|'sw'|'ne'|'nw'} #panelPosition\n\t\t */\n\t\tthis.set( 'panelPosition', 'auto' );\n\n\t\t/**\n\t\t * Instance of the {@link module:utils/keystrokehandler~KeystrokeHandler}. It manages\n\t\t * keystrokes of the dropdown:\n\t\t *\n\t\t * * <kbd>▼</kbd> opens the dropdown,\n\t\t * * <kbd>◀</kbd> and <kbd>Esc</kbd> closes the dropdown.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:utils/keystrokehandler~KeystrokeHandler}\n\t\t */\n\t\tthis.keystrokes = new KeystrokeHandler();\n\n\t\tthis.setTemplate( {\n\t\t\ttag: 'div',\n\n\t\t\tattributes: {\n\t\t\t\tclass: [\n\t\t\t\t\t'ck',\n\t\t\t\t\t'ck-dropdown',\n\t\t\t\t\tbind.to( 'class' ),\n\t\t\t\t\tbind.if( 'isEnabled', 'ck-disabled', value => !value )\n\t\t\t\t],\n\t\t\t\tid: bind.to( 'id' ),\n\t\t\t\t'aria-describedby': bind.to( 'ariaDescribedById' )\n\t\t\t},\n\n\t\t\tchildren: [\n\t\t\t\tbuttonView,\n\t\t\t\tpanelView\n\t\t\t]\n\t\t} );\n\n\t\tbuttonView.extendTemplate( {\n\t\t\tattributes: {\n\t\t\t\tclass: [\n\t\t\t\t\t'ck-dropdown__button'\n\t\t\t\t]\n\t\t\t}\n\t\t} );\n\n\t\t/**\n\t\t * A child {@link module:ui/list/listview~ListView list view} of the dropdown located\n\t\t * in its {@link module:ui/dropdown/dropdownview~DropdownView#panelView panel}.\n\t\t *\n\t\t * **Note**: Only supported when dropdown has list view added using {@link module:ui/dropdown/utils~addListToDropdown}.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:ui/list/listview~ListView} #listView\n\t\t */\n\n\t\t/**\n\t\t * A child toolbar of the dropdown located in the\n\t\t * {@link module:ui/dropdown/dropdownview~DropdownView#panelView panel}.\n\t\t *\n\t\t * **Note**: Only supported when dropdown has list view added using {@link module:ui/dropdown/utils~addToolbarToDropdown}.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:ui/toolbar/toolbarview~ToolbarView} #toolbarView\n\t\t */\n\n\t\t/**\n\t\t * Fired when the toolbar button or list item is executed.\n\t\t *\n\t\t * For {@link #listView} It fires when a child of some {@link module:ui/list/listitemview~ListItemView}\n\t\t * fired `execute`.\n\t\t *\n\t\t * For {@link #toolbarView} It fires when one of the buttons has been\n\t\t * {@link module:ui/button/buttonview~ButtonView#event:execute executed}.\n\t\t *\n\t\t * **Note**: Only supported when dropdown has list view added using {@link module:ui/dropdown/utils~addListToDropdown}\n\t\t * or {@link module:ui/dropdown/utils~addToolbarToDropdown}.\n\t\t *\n\t\t * @event execute\n\t\t */\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\trender() {\n\t\tsuper.render();\n\n\t\t// Toggle the dropdown when its button has been clicked.\n\t\tthis.listenTo( this.buttonView, 'open', () => {\n\t\t\tthis.isOpen = !this.isOpen;\n\t\t} );\n\n\t\t// Toggle the visibility of the panel when the dropdown becomes open.\n\t\tthis.panelView.bind( 'isVisible' ).to( this, 'isOpen' );\n\n\t\t// Let the dropdown control the position of the panel. The position must\n\t\t// be updated every time the dropdown is open.\n\t\tthis.on( 'change:isOpen', () => {\n\t\t\tif ( !this.isOpen ) {\n\t\t\t\treturn;\n\t\t\t}\n\n\t\t\t// If \"auto\", find the best position of the panel to fit into the viewport.\n\t\t\t// Otherwise, simply assign the static position.\n\t\t\tif ( this.panelPosition === 'auto' ) {\n\t\t\t\tthis.panelView.position = DropdownView._getOptimalPosition( {\n\t\t\t\t\telement: this.panelView.element,\n\t\t\t\t\ttarget: this.buttonView.element,\n\t\t\t\t\tfitInViewport: true,\n\t\t\t\t\tpositions: this._panelPositions\n\t\t\t\t} ).name;\n\t\t\t} else {\n\t\t\t\tthis.panelView.position = this.panelPosition;\n\t\t\t}\n\t\t} );\n\n\t\t// Listen for keystrokes coming from within #element.\n\t\tthis.keystrokes.listenTo( this.element );\n\n\t\tconst closeDropdown = ( data, cancel ) => {\n\t\t\tif ( this.isOpen ) {\n\t\t\t\tthis.buttonView.focus();\n\t\t\t\tthis.isOpen = false;\n\t\t\t\tcancel();\n\t\t\t}\n\t\t};\n\n\t\t// Open the dropdown panel using the arrow down key, just like with return or space.\n\t\tthis.keystrokes.set( 'arrowdown', ( data, cancel ) => {\n\t\t\t// Don't open if the dropdown is disabled or already open.\n\t\t\tif ( this.buttonView.isEnabled && !this.isOpen ) {\n\t\t\t\tthis.isOpen = true;\n\t\t\t\tcancel();\n\t\t\t}\n\t\t} );\n\n\t\t// Block the right arrow key (until nested dropdowns are implemented).\n\t\tthis.keystrokes.set( 'arrowright', ( data, cancel ) => {\n\t\t\tif ( this.isOpen ) {\n\t\t\t\tcancel();\n\t\t\t}\n\t\t} );\n\n\t\t// Close the dropdown using the arrow left/escape key.\n\t\tthis.keystrokes.set( 'arrowleft', closeDropdown );\n\t\tthis.keystrokes.set( 'esc', closeDropdown );\n\t}\n\n\t/**\n\t * Focuses the {@link #buttonView}.\n\t */\n\tfocus() {\n\t\tthis.buttonView.focus();\n\t}\n\n\t/**\n\t * Returns {@link #panelView panel} positions to be used by the\n\t * {@link module:utils/dom/position~getOptimalPosition `getOptimalPosition()`}\n\t * utility considering the direction of the language the UI of the editor is displayed in.\n\t *\n\t * @type {module:utils/dom/position~Options#positions}\n\t * @private\n\t */\n\tget _panelPositions() {\n\t\tconst { southEast, southWest, northEast, northWest } = DropdownView.defaultPanelPositions;\n\n\t\tif ( this.locale.uiLanguageDirection === 'ltr' ) {\n\t\t\treturn [ southEast, southWest, northEast, northWest ];\n\t\t} else {\n\t\t\treturn [ southWest, southEast, northWest, northEast ];\n\t\t}\n\t}\n}\n\n/**\n * A set of positioning functions used by the dropdown view to determine\n * the optimal position (i.e. fitting into the browser viewport) of its\n * {@link module:ui/dropdown/dropdownview~DropdownView#panelView panel} when\n * {@link module:ui/dropdown/dropdownview~DropdownView#panelPosition} is set to 'auto'`.\n *\n * The available positioning functions are as follow:\n *\n * **South**\n *\n * * `southEast`\n *\n *\t\t[ Button ]\n *\t\t+-----------------+\n *\t\t|      Panel      |\n *\t\t+-----------------+\n *\n * * `southWest`\n *\n *\t\t         [ Button ]\n *\t\t+-----------------+\n *\t\t|      Panel      |\n *\t\t+-----------------+\n *\n * **North**\n *\n * * `northEast`\n *\n *\t\t+-----------------+\n *\t\t|      Panel      |\n *\t\t+-----------------+\n *\t\t[ Button ]\n *\n * * `northWest`\n *\n *\t\t+-----------------+\n *\t\t|      Panel      |\n *\t\t+-----------------+\n *\t\t         [ Button ]\n *\n * Positioning functions are compatible with {@link module:utils/dom/position~Position}.\n *\n * The name that position function returns will be reflected in dropdown panel's class that\n * controls its placement. See {@link module:ui/dropdown/dropdownview~DropdownView#panelPosition}\n * to learn more.\n *\n * @member {Object} module:ui/dropdown/dropdownview~DropdownView.defaultPanelPositions\n */\nDropdownView.defaultPanelPositions = {\n\tsouthEast: buttonRect => {\n\t\treturn {\n\t\t\ttop: buttonRect.bottom,\n\t\t\tleft: buttonRect.left,\n\t\t\tname: 'se'\n\t\t};\n\t},\n\tsouthWest: ( buttonRect, panelRect ) => {\n\t\treturn {\n\t\t\ttop: buttonRect.bottom,\n\t\t\tleft: buttonRect.left - panelRect.width + buttonRect.width,\n\t\t\tname: 'sw'\n\t\t};\n\t},\n\tnorthEast: ( buttonRect, panelRect ) => {\n\t\treturn {\n\t\t\ttop: buttonRect.top - panelRect.height,\n\t\t\tleft: buttonRect.left,\n\t\t\tname: 'ne'\n\t\t};\n\t},\n\tnorthWest: ( buttonRect, panelRect ) => {\n\t\treturn {\n\t\t\ttop: buttonRect.bottom - panelRect.height,\n\t\t\tleft: buttonRect.left - panelRect.width + buttonRect.width,\n\t\t\tname: 'nw'\n\t\t};\n\t}\n};\n\n/**\n * A function used to calculate the optimal position for the dropdown panel.\n *\n * @protected\n * @member {Function} module:ui/dropdown/dropdownview~DropdownView._getOptimalPosition\n */\nDropdownView._getOptimalPosition = getOptimalPosition;\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module utils/dom/getpositionedancestor\n */\n\nimport global from './global';\n\n/**\n * For a given element, returns the nearest ancestor element which CSS position is not \"static\".\n *\n * @param {HTMLElement} element The native DOM element to be checked.\n * @returns {HTMLElement|null}\n */\nexport default function getPositionedAncestor( element ) {\n\tif ( !element || !element.parentNode ) {\n\t\treturn null;\n\t}\n\n\tif ( element.offsetParent === global.document.body ) {\n\t\treturn null;\n\t}\n\n\treturn element.offsetParent;\n}\n","import api from \"!../../../../../style-loader/dist/runtime/injectStylesIntoStyleTag.js\";\n            import content from \"!!../../../../../css-loader/dist/cjs.js!../../../../../postcss-loader/dist/cjs.js??ref--5-2!./icon.css\";\n\nvar options = {\"injectType\":\"singletonStyleTag\",\"attributes\":{\"data-cke\":true}};\n\noptions.insert = \"head\";\noptions.singleton = true;\n\nvar update = api(content, options);\n\n\n\nexport default content.locals || {};","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/* global DOMParser */\n\n/**\n * @module ui/icon/iconview\n */\n\nimport View from '../view';\n\nimport '../../theme/components/icon/icon.css';\n\n/**\n * The icon view class.\n *\n * @extends module:ui/view~View\n */\nexport default class IconView extends View {\n\t/**\n\t * @inheritDoc\n\t */\n\tconstructor() {\n\t\tsuper();\n\n\t\tconst bind = this.bindTemplate;\n\n\t\t/**\n\t\t * The SVG source of the icon.\n\t\t *\n\t\t * @observable\n\t\t * @member {String} #content\n\t\t */\n\t\tthis.set( 'content', '' );\n\n\t\t/**\n\t\t * This attribute specifies the boundaries to which the\n\t\t * icon content should stretch.\n\t\t *\n\t\t * @observable\n\t\t * @default '0 0 20 20'\n\t\t * @member {String} #viewBox\n\t\t */\n\t\tthis.set( 'viewBox', '0 0 20 20' );\n\n\t\t/**\n\t\t * The fill color of the child `path.ck-icon__fill`.\n\t\t *\n\t\t * @observable\n\t\t * @default ''\n\t\t * @member {String} #fillColor\n\t\t */\n\t\tthis.set( 'fillColor', '' );\n\n\t\tthis.setTemplate( {\n\t\t\ttag: 'svg',\n\t\t\tns: 'http://www.w3.org/2000/svg',\n\t\t\tattributes: {\n\t\t\t\tclass: [\n\t\t\t\t\t'ck',\n\t\t\t\t\t'ck-icon'\n\t\t\t\t],\n\t\t\t\tviewBox: bind.to( 'viewBox' )\n\t\t\t}\n\t\t} );\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\trender() {\n\t\tsuper.render();\n\n\t\tthis._updateXMLContent();\n\t\tthis._colorFillPaths();\n\n\t\t// This is a hack for lack of innerHTML binding.\n\t\t// See: https://github.com/ckeditor/ckeditor5-ui/issues/99.\n\t\tthis.on( 'change:content', () => {\n\t\t\tthis._updateXMLContent();\n\t\t\tthis._colorFillPaths();\n\t\t} );\n\n\t\tthis.on( 'change:fillColor', () => {\n\t\t\tthis._colorFillPaths();\n\t\t} );\n\t}\n\n\t/**\n\t * Updates the {@link #element} with the value of {@link #content}.\n\t *\n\t * @private\n\t */\n\t_updateXMLContent() {\n\t\tif ( this.content ) {\n\t\t\tconst parsed = new DOMParser().parseFromString( this.content.trim(), 'image/svg+xml' );\n\t\t\tconst svg = parsed.querySelector( 'svg' );\n\t\t\tconst viewBox = svg.getAttribute( 'viewBox' );\n\n\t\t\tif ( viewBox ) {\n\t\t\t\tthis.viewBox = viewBox;\n\t\t\t}\n\n\t\t\tthis.element.innerHTML = '';\n\n\t\t\twhile ( svg.childNodes.length > 0 ) {\n\t\t\t\tthis.element.appendChild( svg.childNodes[ 0 ] );\n\t\t\t}\n\t\t}\n\t}\n\n\t/**\n\t * Fills all child `path.ck-icon__fill` with the `#fillColor`.\n\t *\n\t * @private\n\t */\n\t_colorFillPaths() {\n\t\tif ( this.fillColor ) {\n\t\t\tthis.element.querySelectorAll( '.ck-icon__fill' ).forEach( path => {\n\t\t\t\tpath.style.fill = this.fillColor;\n\t\t\t} );\n\t\t}\n\t}\n}\n","import api from \"!../../../../../style-loader/dist/runtime/injectStylesIntoStyleTag.js\";\n            import content from \"!!../../../../../css-loader/dist/cjs.js!../../../../../postcss-loader/dist/cjs.js??ref--5-2!./tooltip.css\";\n\nvar options = {\"injectType\":\"singletonStyleTag\",\"attributes\":{\"data-cke\":true}};\n\noptions.insert = \"head\";\noptions.singleton = true;\n\nvar update = api(content, options);\n\n\n\nexport default content.locals || {};","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module ui/tooltip/tooltipview\n */\n\nimport View from '../view';\n\nimport '../../theme/components/tooltip/tooltip.css';\n\n/**\n * The tooltip view class.\n *\n * @extends module:ui/view~View\n */\nexport default class TooltipView extends View {\n\t/**\n\t * @inheritDoc\n\t */\n\tconstructor( locale ) {\n\t\tsuper( locale );\n\n\t\t/**\n\t\t * The text of the tooltip visible to the user.\n\t\t *\n\t\t * @observable\n\t\t * @member {String} #text\n\t\t */\n\t\tthis.set( 'text', '' );\n\n\t\t/**\n\t\t * The position of the tooltip (south, south-west, south-east, or north).\n\t\t *\n\t\t *\t\t+-----------+\n\t\t *\t\t|   north   |\n\t\t *\t\t+-----------+\n\t\t *\t\t      V\n\t\t *\t\t  [element]\n\t\t *\n\t\t *\t\t  [element]\n\t\t *\t\t      ^\n\t\t *\t\t+-----------+\n\t\t *\t\t|   south   |\n\t\t *\t\t+-----------+\n\t\t *\n\t\t *                +----------+\n\t\t *    [element] < |   east   |\n\t\t *                +----------+\n\t\t *\n\t\t *    +----------+\n\t\t *    |   west   | > [element]\n\t\t *    +----------+\n\t\t *\n\t\t *\t\t         [element]\n\t\t *\t\t             ^\n\t\t *\t\t+--------------+\n\t\t *\t\t|  south west  |\n\t\t *\t\t+--------------+\n\t\t *\n\t\t *\t  [element]\n\t\t *\t\t  ^\n\t\t *\t\t+--------------+\n\t\t *\t\t|  south east  |\n\t\t *\t\t+--------------+\n\n\t\t * @observable\n\t\t * @default 's'\n\t\t * @member {'s'|'n'|'e'|'w'|'sw'|'se'} #position\n\t\t */\n\t\tthis.set( 'position', 's' );\n\n\t\tconst bind = this.bindTemplate;\n\n\t\tthis.setTemplate( {\n\t\t\ttag: 'span',\n\t\t\tattributes: {\n\t\t\t\tclass: [\n\t\t\t\t\t'ck',\n\t\t\t\t\t'ck-tooltip',\n\t\t\t\t\tbind.to( 'position', position => 'ck-tooltip_' + position ),\n\t\t\t\t\tbind.if( 'text', 'ck-hidden', value => !value.trim() )\n\t\t\t\t]\n\t\t\t},\n\t\t\tchildren: [\n\t\t\t\t{\n\t\t\t\t\ttag: 'span',\n\n\t\t\t\t\tattributes: {\n\t\t\t\t\t\tclass: [\n\t\t\t\t\t\t\t'ck',\n\t\t\t\t\t\t\t'ck-tooltip__text'\n\t\t\t\t\t\t]\n\t\t\t\t\t},\n\n\t\t\t\t\tchildren: [\n\t\t\t\t\t\t{\n\t\t\t\t\t\t\ttext: bind.to( 'text' )\n\t\t\t\t\t\t}\n\t\t\t\t\t]\n\t\t\t\t}\n\t\t\t]\n\t\t} );\n\t}\n}\n","import api from \"!../../../../../style-loader/dist/runtime/injectStylesIntoStyleTag.js\";\n            import content from \"!!../../../../../css-loader/dist/cjs.js!../../../../../postcss-loader/dist/cjs.js??ref--5-2!./button.css\";\n\nvar options = {\"injectType\":\"singletonStyleTag\",\"attributes\":{\"data-cke\":true}};\n\noptions.insert = \"head\";\noptions.singleton = true;\n\nvar update = api(content, options);\n\n\n\nexport default content.locals || {};","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module ui/button/buttonview\n */\n\nimport View from '../view';\nimport IconView from '../icon/iconview';\nimport TooltipView from '../tooltip/tooltipview';\n\nimport uid from '@ckeditor/ckeditor5-utils/src/uid';\nimport { getEnvKeystrokeText } from '@ckeditor/ckeditor5-utils/src/keyboard';\n\nimport '../../theme/components/button/button.css';\n\n/**\n * The button view class.\n *\n *\t\tconst view = new ButtonView();\n *\n *\t\tview.set( {\n *\t\t\tlabel: 'A button',\n *\t\t\tkeystroke: 'Ctrl+B',\n *\t\t\ttooltip: true,\n *\t\t\twithText: true\n *\t\t} );\n *\n *\t\tview.render();\n *\n *\t\tdocument.body.append( view.element );\n *\n * @extends module:ui/view~View\n * @implements module:ui/button/button~Button\n */\nexport default class ButtonView extends View {\n\t/**\n\t * @inheritDoc\n\t */\n\tconstructor( locale ) {\n\t\tsuper( locale );\n\n\t\tconst bind = this.bindTemplate;\n\t\tconst ariaLabelUid = uid();\n\n\t\t// Implement the Button interface.\n\t\tthis.set( 'class' );\n\t\tthis.set( 'labelStyle' );\n\t\tthis.set( 'icon' );\n\t\tthis.set( 'isEnabled', true );\n\t\tthis.set( 'isOn', false );\n\t\tthis.set( 'isVisible', true );\n\t\tthis.set( 'isToggleable', false );\n\t\tthis.set( 'keystroke' );\n\t\tthis.set( 'label' );\n\t\tthis.set( 'tabindex', -1 );\n\t\tthis.set( 'tooltip' );\n\t\tthis.set( 'tooltipPosition', 's' );\n\t\tthis.set( 'type', 'button' );\n\t\tthis.set( 'withText', false );\n\t\tthis.set( 'withKeystroke', false );\n\n\t\t/**\n\t\t * Collection of the child views inside of the button {@link #element}.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:ui/viewcollection~ViewCollection}\n\t\t */\n\t\tthis.children = this.createCollection();\n\n\t\t/**\n\t\t * Tooltip of the button view. It is configurable using the {@link #tooltip tooltip attribute}.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:ui/tooltip/tooltipview~TooltipView} #tooltipView\n\t\t */\n\t\tthis.tooltipView = this._createTooltipView();\n\n\t\t/**\n\t\t * Label of the button view. It is configurable using the {@link #label label attribute}.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:ui/view~View} #labelView\n\t\t */\n\t\tthis.labelView = this._createLabelView( ariaLabelUid );\n\n\t\t/**\n\t\t * The icon view of the button. Will be added to {@link #children} when the\n\t\t * {@link #icon icon attribute} is defined.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:ui/icon/iconview~IconView} #iconView\n\t\t */\n\t\tthis.iconView = new IconView();\n\n\t\tthis.iconView.extendTemplate( {\n\t\t\tattributes: {\n\t\t\t\tclass: 'ck-button__icon'\n\t\t\t}\n\t\t} );\n\n\t\t/**\n\t\t * A view displaying the keystroke of the button next to the {@link #labelView label}.\n\t\t * Added to {@link #children} when the {@link #withKeystroke `withKeystroke` attribute}\n\t\t * is defined.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:ui/view/view~View} #keystrokeView\n\t\t */\n\t\tthis.keystrokeView = this._createKeystrokeView();\n\n\t\t/**\n\t\t * Tooltip of the button bound to the template.\n\t\t *\n\t\t * @see #tooltip\n\t\t * @see #_getTooltipString\n\t\t * @private\n\t\t * @observable\n\t\t * @member {Boolean} #_tooltipString\n\t\t */\n\t\tthis.bind( '_tooltipString' ).to(\n\t\t\tthis, 'tooltip',\n\t\t\tthis, 'label',\n\t\t\tthis, 'keystroke',\n\t\t\tthis._getTooltipString.bind( this )\n\t\t);\n\n\t\tthis.setTemplate( {\n\t\t\ttag: 'button',\n\n\t\t\tattributes: {\n\t\t\t\tclass: [\n\t\t\t\t\t'ck',\n\t\t\t\t\t'ck-button',\n\t\t\t\t\tbind.to( 'class' ),\n\t\t\t\t\tbind.if( 'isEnabled', 'ck-disabled', value => !value ),\n\t\t\t\t\tbind.if( 'isVisible', 'ck-hidden', value => !value ),\n\t\t\t\t\tbind.to( 'isOn', value => value ? 'ck-on' : 'ck-off' ),\n\t\t\t\t\tbind.if( 'withText', 'ck-button_with-text' ),\n\t\t\t\t\tbind.if( 'withKeystroke', 'ck-button_with-keystroke' )\n\t\t\t\t],\n\t\t\t\ttype: bind.to( 'type', value => value ? value : 'button' ),\n\t\t\t\ttabindex: bind.to( 'tabindex' ),\n\t\t\t\t'aria-labelledby': `ck-editor__aria-label_${ ariaLabelUid }`,\n\t\t\t\t'aria-disabled': bind.if( 'isEnabled', true, value => !value ),\n\t\t\t\t'aria-pressed': bind.to( 'isOn', value => this.isToggleable ? String( value ) : false )\n\t\t\t},\n\n\t\t\tchildren: this.children,\n\n\t\t\ton: {\n\t\t\t\tmousedown: bind.to( evt => {\n\t\t\t\t\tevt.preventDefault();\n\t\t\t\t} ),\n\n\t\t\t\tclick: bind.to( evt => {\n\t\t\t\t\t// We can't make the button disabled using the disabled attribute, because it won't be focusable.\n\t\t\t\t\t// Though, shouldn't this condition be moved to the button controller?\n\t\t\t\t\tif ( this.isEnabled ) {\n\t\t\t\t\t\tthis.fire( 'execute' );\n\t\t\t\t\t} else {\n\t\t\t\t\t\t// Prevent the default when button is disabled, to block e.g.\n\t\t\t\t\t\t// automatic form submitting. See ckeditor/ckeditor5-link#74.\n\t\t\t\t\t\tevt.preventDefault();\n\t\t\t\t\t}\n\t\t\t\t} )\n\t\t\t}\n\t\t} );\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\trender() {\n\t\tsuper.render();\n\n\t\tif ( this.icon ) {\n\t\t\tthis.iconView.bind( 'content' ).to( this, 'icon' );\n\t\t\tthis.children.add( this.iconView );\n\t\t}\n\n\t\tthis.children.add( this.tooltipView );\n\t\tthis.children.add( this.labelView );\n\n\t\tif ( this.withKeystroke ) {\n\t\t\tthis.children.add( this.keystrokeView );\n\t\t}\n\t}\n\n\t/**\n\t * Focuses the {@link #element} of the button.\n\t */\n\tfocus() {\n\t\tthis.element.focus();\n\t}\n\n\t/**\n\t * Creates a {@link module:ui/tooltip/tooltipview~TooltipView} instance and binds it with button\n\t * attributes.\n\t *\n\t * @private\n\t * @returns {module:ui/tooltip/tooltipview~TooltipView}\n\t */\n\t_createTooltipView() {\n\t\tconst tooltipView = new TooltipView();\n\n\t\ttooltipView.bind( 'text' ).to( this, '_tooltipString' );\n\t\ttooltipView.bind( 'position' ).to( this, 'tooltipPosition' );\n\n\t\treturn tooltipView;\n\t}\n\n\t/**\n\t * Creates a label view instance and binds it with button attributes.\n\t *\n\t * @private\n\t * @param {String} ariaLabelUid The aria label UID.\n\t * @returns {module:ui/view~View}\n\t */\n\t_createLabelView( ariaLabelUid ) {\n\t\tconst labelView = new View();\n\t\tconst bind = this.bindTemplate;\n\n\t\tlabelView.setTemplate( {\n\t\t\ttag: 'span',\n\n\t\t\tattributes: {\n\t\t\t\tclass: [\n\t\t\t\t\t'ck',\n\t\t\t\t\t'ck-button__label'\n\t\t\t\t],\n\t\t\t\tstyle: bind.to( 'labelStyle' ),\n\t\t\t\tid: `ck-editor__aria-label_${ ariaLabelUid }`\n\t\t\t},\n\n\t\t\tchildren: [\n\t\t\t\t{\n\t\t\t\t\ttext: this.bindTemplate.to( 'label' )\n\t\t\t\t}\n\t\t\t]\n\t\t} );\n\n\t\treturn labelView;\n\t}\n\n\t/**\n\t * Creates a view that displays a keystroke next to a {@link #labelView label }\n\t * and binds it with button attributes.\n\t *\n\t * @private\n\t * @returns {module:ui/view~View}\n\t */\n\t_createKeystrokeView() {\n\t\tconst keystrokeView = new View();\n\n\t\tkeystrokeView.setTemplate( {\n\t\t\ttag: 'span',\n\n\t\t\tattributes: {\n\t\t\t\tclass: [\n\t\t\t\t\t'ck',\n\t\t\t\t\t'ck-button__keystroke'\n\t\t\t\t]\n\t\t\t},\n\n\t\t\tchildren: [\n\t\t\t\t{\n\t\t\t\t\ttext: this.bindTemplate.to( 'keystroke', text => getEnvKeystrokeText( text ) )\n\t\t\t\t}\n\t\t\t]\n\t\t} );\n\n\t\treturn keystrokeView;\n\t}\n\n\t/**\n\t * Gets the text for the {@link #tooltipView} from the combination of\n\t * {@link #tooltip}, {@link #label} and {@link #keystroke} attributes.\n\t *\n\t * @private\n\t * @see #tooltip\n\t * @see #_tooltipString\n\t * @param {Boolean|String|Function} tooltip Button tooltip.\n\t * @param {String} label Button label.\n\t * @param {String} keystroke Button keystroke.\n\t * @returns {String}\n\t */\n\t_getTooltipString( tooltip, label, keystroke ) {\n\t\tif ( tooltip ) {\n\t\t\tif ( typeof tooltip == 'string' ) {\n\t\t\t\treturn tooltip;\n\t\t\t} else {\n\t\t\t\tif ( keystroke ) {\n\t\t\t\t\tkeystroke = getEnvKeystrokeText( keystroke );\n\t\t\t\t}\n\n\t\t\t\tif ( tooltip instanceof Function ) {\n\t\t\t\t\treturn tooltip( label, keystroke );\n\t\t\t\t} else {\n\t\t\t\t\treturn `${ label }${ keystroke ? ` (${ keystroke })` : '' }`;\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\n\t\treturn '';\n\t}\n}\n","export default \"<svg viewBox=\\\"0 0 10 10\\\" xmlns=\\\"http://www.w3.org/2000/svg\\\"><path d=\\\"M.941 4.523a.75.75 0 1 1 1.06-1.06l3.006 3.005 3.005-3.005a.75.75 0 1 1 1.06 1.06l-3.549 3.55a.75.75 0 0 1-1.168-.136L.941 4.523z\\\"/></svg>\";","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module ui/dropdown/button/dropdownbuttonview\n */\n\nimport ButtonView from '../../button/buttonview';\n\nimport dropdownArrowIcon from '../../../theme/icons/dropdown-arrow.svg';\nimport IconView from '../../icon/iconview';\n\n/**\n * The default dropdown button view class.\n *\n *\t\tconst view = new DropdownButtonView();\n *\n *\t\tview.set( {\n *\t\t\tlabel: 'A button',\n *\t\t\tkeystroke: 'Ctrl+B',\n *\t\t\ttooltip: true\n *\t\t} );\n *\n *\t\tview.render();\n *\n *\t\tdocument.body.append( view.element );\n *\n * Also see the {@link module:ui/dropdown/utils~createDropdown `createDropdown()` util}.\n *\n * @implements module:ui/dropdown/button/dropdownbutton~DropdownButton\n * @extends module:ui/button/buttonview~ButtonView\n */\nexport default class DropdownButtonView extends ButtonView {\n\t/**\n\t * @inheritDoc\n\t */\n\tconstructor( locale ) {\n\t\tsuper( locale );\n\n\t\t/**\n\t\t * An icon that displays arrow to indicate a dropdown button.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:ui/icon/iconview~IconView}\n\t\t */\n\t\tthis.arrowView = this._createArrowView();\n\n\t\tthis.extendTemplate( {\n\t\t\tattributes: {\n\t\t\t\t'aria-haspopup': true\n\t\t\t}\n\t\t} );\n\n\t\t// The DropdownButton interface expects the open event upon which will open the dropdown.\n\t\tthis.delegate( 'execute' ).to( this, 'open' );\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\trender() {\n\t\tsuper.render();\n\n\t\tthis.children.add( this.arrowView );\n\t}\n\n\t/**\n\t * Creates a {@link module:ui/icon/iconview~IconView} instance as {@link #arrowView}.\n\t *\n\t * @private\n\t * @returns {module:ui/icon/iconview~IconView}\n\t */\n\t_createArrowView() {\n\t\tconst arrowView = new IconView();\n\n\t\tarrowView.content = dropdownArrowIcon;\n\n\t\tarrowView.extendTemplate( {\n\t\t\tattributes: {\n\t\t\t\tclass: 'ck-dropdown__arrow'\n\t\t\t}\n\t\t} );\n\n\t\treturn arrowView;\n\t}\n}\n","import api from \"!../../../../../style-loader/dist/runtime/injectStylesIntoStyleTag.js\";\n            import content from \"!!../../../../../css-loader/dist/cjs.js!../../../../../postcss-loader/dist/cjs.js??ref--5-2!./list.css\";\n\nvar options = {\"injectType\":\"singletonStyleTag\",\"attributes\":{\"data-cke\":true}};\n\noptions.insert = \"head\";\noptions.singleton = true;\n\nvar update = api(content, options);\n\n\n\nexport default content.locals || {};","import api from \"!../../../../../style-loader/dist/runtime/injectStylesIntoStyleTag.js\";\n            import content from \"!!../../../../../css-loader/dist/cjs.js!../../../../../postcss-loader/dist/cjs.js??ref--5-2!./switchbutton.css\";\n\nvar options = {\"injectType\":\"singletonStyleTag\",\"attributes\":{\"data-cke\":true}};\n\noptions.insert = \"head\";\noptions.singleton = true;\n\nvar update = api(content, options);\n\n\n\nexport default content.locals || {};","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module ui/button/switchbuttonview\n */\n\nimport View from '../view';\nimport ButtonView from './buttonview';\n\nimport '../../theme/components/button/switchbutton.css';\n\n/**\n * The switch button view class.\n *\n *\t\tconst view = new SwitchButtonView();\n *\n *\t\tview.set( {\n *\t\t\twithText: true,\n *\t\t\tlabel: 'Switch me!'\n *\t\t} );\n *\n *\t\tview.render();\n *\n *\t\tdocument.body.append( view.element );\n *\n * @extends module:ui/button/buttonview~ButtonView\n */\nexport default class SwitchButtonView extends ButtonView {\n\t/**\n\t * @inheritDoc\n\t */\n\tconstructor( locale ) {\n\t\tsuper( locale );\n\n\t\tthis.isToggleable = true;\n\n\t\t/**\n\t\t * The toggle switch of the button.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:ui/view~View} #toggleSwitchView\n\t\t */\n\t\tthis.toggleSwitchView = this._createToggleView();\n\n\t\tthis.extendTemplate( {\n\t\t\tattributes: {\n\t\t\t\tclass: 'ck-switchbutton'\n\t\t\t}\n\t\t} );\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\trender() {\n\t\tsuper.render();\n\n\t\tthis.children.add( this.toggleSwitchView );\n\t}\n\n\t/**\n\t * Creates a toggle child view.\n\t *\n\t * @private\n\t * @returns {module:ui/view~View}\n\t */\n\t_createToggleView() {\n\t\tconst toggleSwitchView = new View();\n\n\t\ttoggleSwitchView.setTemplate( {\n\t\t\ttag: 'span',\n\n\t\t\tattributes: {\n\t\t\t\tclass: [\n\t\t\t\t\t'ck',\n\t\t\t\t\t'ck-button__toggle'\n\t\t\t\t]\n\t\t\t},\n\n\t\t\tchildren: [\n\t\t\t\t{\n\t\t\t\t\ttag: 'span',\n\n\t\t\t\t\tattributes: {\n\t\t\t\t\t\tclass: [\n\t\t\t\t\t\t\t'ck',\n\t\t\t\t\t\t\t'ck-button__toggle__inner'\n\t\t\t\t\t\t]\n\t\t\t\t\t}\n\t\t\t\t}\n\t\t\t]\n\t\t} );\n\n\t\treturn toggleSwitchView;\n\t}\n}\n","import api from \"!../../../../../style-loader/dist/runtime/injectStylesIntoStyleTag.js\";\n            import content from \"!!../../../../../css-loader/dist/cjs.js!../../../../../postcss-loader/dist/cjs.js??ref--5-2!./toolbardropdown.css\";\n\nvar options = {\"injectType\":\"singletonStyleTag\",\"attributes\":{\"data-cke\":true}};\n\noptions.insert = \"head\";\noptions.singleton = true;\n\nvar update = api(content, options);\n\n\n\nexport default content.locals || {};","import api from \"!../../../../../style-loader/dist/runtime/injectStylesIntoStyleTag.js\";\n            import content from \"!!../../../../../css-loader/dist/cjs.js!../../../../../postcss-loader/dist/cjs.js??ref--5-2!./listdropdown.css\";\n\nvar options = {\"injectType\":\"singletonStyleTag\",\"attributes\":{\"data-cke\":true}};\n\noptions.insert = \"head\";\noptions.singleton = true;\n\nvar update = api(content, options);\n\n\n\nexport default content.locals || {};","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module ui/dropdown/utils\n */\n\nimport DropdownPanelView from './dropdownpanelview';\nimport DropdownView from './dropdownview';\nimport DropdownButtonView from './button/dropdownbuttonview';\nimport ToolbarView from '../toolbar/toolbarview';\nimport ListView from '../list/listview';\nimport ListItemView from '../list/listitemview';\nimport ListSeparatorView from '../list/listseparatorview';\nimport ButtonView from '../button/buttonview';\nimport SwitchButtonView from '../button/switchbuttonview';\n\nimport clickOutsideHandler from '../bindings/clickoutsidehandler';\n\nimport '../../theme/components/dropdown/toolbardropdown.css';\nimport '../../theme/components/dropdown/listdropdown.css';\n\n/**\n * A helper for creating dropdowns. It creates an instance of a {@link module:ui/dropdown/dropdownview~DropdownView dropdown},\n * with a {@link module:ui/dropdown/button/dropdownbutton~DropdownButton button},\n * {@link module:ui/dropdown/dropdownpanelview~DropdownPanelView panel} and all standard dropdown's behaviors.\n *\n * # Creating dropdowns\n *\n * By default, the default {@link module:ui/dropdown/button/dropdownbuttonview~DropdownButtonView} class is used as\n * definition of the button:\n *\n *\t\tconst dropdown = createDropdown( model );\n *\n *\t\t// Configure dropdown's button properties:\n *\t\tdropdown.buttonView.set( {\n *\t\t\tlabel: 'A dropdown',\n *\t\t\twithText: true\n *\t\t} );\n *\n *\t\tdropdown.render();\n *\n *\t\t// Will render a dropdown labeled \"A dropdown\" with an empty panel.\n *\t\tdocument.body.appendChild( dropdown.element );\n *\n * You can also provide other button views (they need to implement the\n * {@link module:ui/dropdown/button/dropdownbutton~DropdownButton} interface). For instance, you can use\n * {@link module:ui/dropdown/button/splitbuttonview~SplitButtonView} to create a dropdown with a split button.\n *\n *\t\tconst dropdown = createDropdown( model, SplitButtonView );\n *\n *\t\t// Configure dropdown's button properties:\n *\t\tdropdown.buttonView.set( {\n *\t\t\tlabel: 'A dropdown',\n *\t\t\twithText: true\n *\t\t} );\n *\n *\t\tdropdown.buttonView.on( 'execute', () => {\n *\t\t\t// Add the behavior of the \"action part\" of the split button.\n *\t\t\t// Split button consists of the \"action part\" and \"arrow part\".\n *\t\t\t// The arrow opens the dropdown while the action part can have some other behavior.\n * \t\t} );\n *\n *\t\tdropdown.render();\n *\n *\t\t// Will render a dropdown labeled \"A dropdown\" with an empty panel.\n *\t\tdocument.body.appendChild( dropdown.element );\n *\n * # Adding content to the dropdown's panel\n *\n * The content of the panel can be inserted directly into the `dropdown.panelView.element`:\n *\n *\t\tdropdown.panelView.element.textContent = 'Content of the panel';\n *\n * However, most of the time you will want to add there either a {@link module:ui/list/listview~ListView list of options}\n * or a list of buttons (i.e. a {@link module:ui/toolbar/toolbarview~ToolbarView toolbar}).\n * To simplify the task, you can use, respectively, {@link module:ui/dropdown/utils~addListToDropdown} or\n * {@link module:ui/dropdown/utils~addToolbarToDropdown} utils.\n *\n * @param {module:utils/locale~Locale} locale The locale instance.\n * @param {Function} ButtonClass The dropdown button view class. Needs to implement the\n * {@link module:ui/dropdown/button/dropdownbutton~DropdownButton} interface.\n * @returns {module:ui/dropdown/dropdownview~DropdownView} The dropdown view instance.\n */\nexport function createDropdown( locale, ButtonClass = DropdownButtonView ) {\n\tconst buttonView = new ButtonClass( locale );\n\n\tconst panelView = new DropdownPanelView( locale );\n\tconst dropdownView = new DropdownView( locale, buttonView, panelView );\n\n\tbuttonView.bind( 'isEnabled' ).to( dropdownView );\n\n\tif ( buttonView instanceof DropdownButtonView ) {\n\t\tbuttonView.bind( 'isOn' ).to( dropdownView, 'isOpen' );\n\t} else {\n\t\tbuttonView.arrowView.bind( 'isOn' ).to( dropdownView, 'isOpen' );\n\t}\n\n\taddDefaultBehavior( dropdownView );\n\n\treturn dropdownView;\n}\n\n/**\n * Adds an instance of {@link module:ui/toolbar/toolbarview~ToolbarView} to a dropdown.\n *\n *\t\tconst buttons = [];\n *\n *\t\t// Either create a new ButtonView instance or create existing.\n *\t\tbuttons.push( new ButtonView() );\n *\t\tbuttons.push( editor.ui.componentFactory.create( 'someButton' ) );\n *\n *\t\tconst dropdown = createDropdown( locale );\n *\n *\t\taddToolbarToDropdown( dropdown, buttons );\n *\n *\t\tdropdown.toolbarView.isVertical = true;\n *\n *\t\t// Will render a vertical button dropdown labeled \"A button dropdown\"\n *\t\t// with a button group in the panel containing two buttons.\n *\t\tdropdown.render()\n *\t\tdocument.body.appendChild( dropdown.element );\n *\n * See {@link module:ui/dropdown/utils~createDropdown} and {@link module:ui/toolbar/toolbarview~ToolbarView}.\n *\n * @param {module:ui/dropdown/dropdownview~DropdownView} dropdownView A dropdown instance to which `ToolbarView` will be added.\n * @param {Iterable.<module:ui/button/buttonview~ButtonView>} buttons\n */\nexport function addToolbarToDropdown( dropdownView, buttons ) {\n\tconst locale = dropdownView.locale;\n\tconst t = locale.t;\n\tconst toolbarView = dropdownView.toolbarView = new ToolbarView( locale );\n\n\ttoolbarView.set( 'ariaLabel', t( 'Dropdown toolbar' ) );\n\n\tdropdownView.extendTemplate( {\n\t\tattributes: {\n\t\t\tclass: [ 'ck-toolbar-dropdown' ]\n\t\t}\n\t} );\n\n\tbuttons.map( view => toolbarView.items.add( view ) );\n\n\tdropdownView.panelView.children.add( toolbarView );\n\ttoolbarView.items.delegate( 'execute' ).to( dropdownView );\n}\n\n/**\n * Adds an instance of {@link module:ui/list/listview~ListView} to a dropdown.\n *\n *\t\tconst items = new Collection();\n *\n *\t\titems.add( {\n *\t\t\ttype: 'button',\n *\t\t\tmodel: new Model( {\n *\t\t\t\twithText: true,\n *\t\t\t\tlabel: 'First item',\n *\t\t\t\tlabelStyle: 'color: red'\n *\t\t\t} )\n *\t\t} );\n *\n *\t\titems.add( {\n *\t\t\t type: 'button',\n *\t\t\t model: new Model( {\n *\t\t\t\twithText: true,\n *\t\t\t\tlabel: 'Second item',\n *\t\t\t\tlabelStyle: 'color: green',\n *\t\t\t\tclass: 'foo'\n *\t\t\t} )\n *\t\t} );\n *\n *\t\tconst dropdown = createDropdown( locale );\n *\n *\t\taddListToDropdown( dropdown, items );\n *\n *\t\t// Will render a dropdown with a list in the panel containing two items.\n *\t\tdropdown.render()\n *\t\tdocument.body.appendChild( dropdown.element );\n *\n * The `items` collection passed to this methods controls the presence and attributes of respective\n * {@link module:ui/list/listitemview~ListItemView list items}.\n *\n *\n * See {@link module:ui/dropdown/utils~createDropdown} and {@link module:list/list~List}.\n *\n * @param {module:ui/dropdown/dropdownview~DropdownView} dropdownView A dropdown instance to which `ListVIew` will be added.\n * @param {Iterable.<module:ui/dropdown/utils~ListDropdownItemDefinition>} items\n * A collection of the list item definitions to populate the list.\n */\nexport function addListToDropdown( dropdownView, items ) {\n\tconst locale = dropdownView.locale;\n\tconst listView = dropdownView.listView = new ListView( locale );\n\n\tlistView.items.bindTo( items ).using( ( { type, model } ) => {\n\t\tif ( type === 'separator' ) {\n\t\t\treturn new ListSeparatorView( locale );\n\t\t} else if ( type === 'button' || type === 'switchbutton' ) {\n\t\t\tconst listItemView = new ListItemView( locale );\n\t\t\tlet buttonView;\n\n\t\t\tif ( type === 'button' ) {\n\t\t\t\tbuttonView = new ButtonView( locale );\n\t\t\t} else {\n\t\t\t\tbuttonView = new SwitchButtonView( locale );\n\t\t\t}\n\n\t\t\t// Bind all model properties to the button view.\n\t\t\tbuttonView.bind( ...Object.keys( model ) ).to( model );\n\t\t\tbuttonView.delegate( 'execute' ).to( listItemView );\n\n\t\t\tlistItemView.children.add( buttonView );\n\n\t\t\treturn listItemView;\n\t\t}\n\t} );\n\n\tdropdownView.panelView.children.add( listView );\n\n\tlistView.items.delegate( 'execute' ).to( dropdownView );\n}\n\n// Add a set of default behaviors to dropdown view.\n//\n// @param {module:ui/dropdown/dropdownview~DropdownView} dropdownView\nfunction addDefaultBehavior( dropdownView ) {\n\tcloseDropdownOnBlur( dropdownView );\n\tcloseDropdownOnExecute( dropdownView );\n\tfocusDropdownContentsOnArrows( dropdownView );\n}\n\n// Adds a behavior to a dropdownView that closes opened dropdown when user clicks outside the dropdown.\n//\n// @param {module:ui/dropdown/dropdownview~DropdownView} dropdownView\nfunction closeDropdownOnBlur( dropdownView ) {\n\tdropdownView.on( 'render', () => {\n\t\tclickOutsideHandler( {\n\t\t\temitter: dropdownView,\n\t\t\tactivator: () => dropdownView.isOpen,\n\t\t\tcallback: () => {\n\t\t\t\tdropdownView.isOpen = false;\n\t\t\t},\n\t\t\tcontextElements: [ dropdownView.element ]\n\t\t} );\n\t} );\n}\n\n// Adds a behavior to a dropdownView that closes the dropdown view on \"execute\" event.\n//\n// @param {module:ui/dropdown/dropdownview~DropdownView} dropdownView\nfunction closeDropdownOnExecute( dropdownView ) {\n\t// Close the dropdown when one of the list items has been executed.\n\tdropdownView.on( 'execute', evt => {\n\t\t// Toggling a switch button view should not close the dropdown.\n\t\tif ( evt.source instanceof SwitchButtonView ) {\n\t\t\treturn;\n\t\t}\n\n\t\tdropdownView.isOpen = false;\n\t} );\n}\n\n// Adds a behavior to a dropdownView that focuses the dropdown's panel view contents on keystrokes.\n//\n// @param {module:ui/dropdown/dropdownview~DropdownView} dropdownView\nfunction focusDropdownContentsOnArrows( dropdownView ) {\n\t// If the dropdown panel is already open, the arrow down key should focus the first child of the #panelView.\n\tdropdownView.keystrokes.set( 'arrowdown', ( data, cancel ) => {\n\t\tif ( dropdownView.isOpen ) {\n\t\t\tdropdownView.panelView.focus();\n\t\t\tcancel();\n\t\t}\n\t} );\n\n\t// If the dropdown panel is already open, the arrow up key should focus the last child of the #panelView.\n\tdropdownView.keystrokes.set( 'arrowup', ( data, cancel ) => {\n\t\tif ( dropdownView.isOpen ) {\n\t\t\tdropdownView.panelView.focusLast();\n\t\t\tcancel();\n\t\t}\n\t} );\n}\n\n/**\n * A definition of the list item used by the {@link module:ui/dropdown/utils~addListToDropdown}\n * utility.\n *\n * @typedef {Object} module:ui/dropdown/utils~ListDropdownItemDefinition\n *\n * @property {String} type Either `'separator'`, `'button'` or `'switchbutton'`.\n * @property {module:ui/model~Model} [model] Model of the item (when **not** `'separator'`).\n * Its properties fuel the newly created list item (or its children, depending on the `type`).\n */\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module ui/bindings/clickoutsidehandler\n */\n\n/* global document */\n\n/**\n * Handles clicking **outside** of a specified set of elements, then fires an action.\n *\n * **Note**: Actually, the action is executed upon `mousedown`, not `click`. It prevents\n * certain issues when the user keeps holding the mouse button and the UI cannot react\n * properly.\n *\n * @param {Object} options Configuration options.\n * @param {module:utils/dom/emittermixin~Emitter} options.emitter The emitter to which this behavior\n * should be added.\n * @param {Function} options.activator Function returning a `Boolean`, to determine whether the handler is active.\n * @param {Array.<HTMLElement>} options.contextElements HTML elements that determine the scope of the\n * handler. Clicking any of them or their descendants will **not** fire the callback.\n * @param {Function} options.callback An action executed by the handler.\n */\nexport default function clickOutsideHandler( { emitter, activator, callback, contextElements } ) {\n\temitter.listenTo( document, 'mousedown', ( evt, domEvt ) => {\n\t\tif ( !activator() ) {\n\t\t\treturn;\n\t\t}\n\n\t\t// Check if `composedPath` is `undefined` in case the browser does not support native shadow DOM.\n\t\t// Can be removed when all supported browsers support native shadow DOM.\n\t\tconst path = typeof domEvt.composedPath == 'function' ? domEvt.composedPath() : [];\n\n\t\tfor ( const contextElement of contextElements ) {\n\t\t\tif ( contextElement.contains( domEvt.target ) || path.includes( contextElement ) ) {\n\t\t\t\treturn;\n\t\t\t}\n\t\t}\n\n\t\tcallback();\n\t} );\n}\n","export default \"<svg viewBox=\\\"0 0 20 20\\\" xmlns=\\\"http://www.w3.org/2000/svg\\\"><circle cx=\\\"9.5\\\" cy=\\\"4.5\\\" r=\\\"1.5\\\"/><circle cx=\\\"9.5\\\" cy=\\\"10.5\\\" r=\\\"1.5\\\"/><circle cx=\\\"9.5\\\" cy=\\\"16.5\\\" r=\\\"1.5\\\"/></svg>\";","import api from \"!../../../../../style-loader/dist/runtime/injectStylesIntoStyleTag.js\";\n            import content from \"!!../../../../../css-loader/dist/cjs.js!../../../../../postcss-loader/dist/cjs.js??ref--5-2!./toolbar.css\";\n\nvar options = {\"injectType\":\"singletonStyleTag\",\"attributes\":{\"data-cke\":true}};\n\noptions.insert = \"head\";\noptions.singleton = true;\n\nvar update = api(content, options);\n\n\n\nexport default content.locals || {};","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module ui/toolbar/toolbarview\n */\n\nimport View from '../view';\nimport FocusTracker from '@ckeditor/ckeditor5-utils/src/focustracker';\nimport FocusCycler from '../focuscycler';\nimport KeystrokeHandler from '@ckeditor/ckeditor5-utils/src/keystrokehandler';\nimport ToolbarSeparatorView from './toolbarseparatorview';\nimport ToolbarLineBreakView from './toolbarlinebreakview';\nimport ResizeObserver from '@ckeditor/ckeditor5-utils/src/dom/resizeobserver';\nimport preventDefault from '../bindings/preventdefault.js';\nimport Rect from '@ckeditor/ckeditor5-utils/src/dom/rect';\nimport global from '@ckeditor/ckeditor5-utils/src/dom/global';\nimport { createDropdown, addToolbarToDropdown } from '../dropdown/utils';\nimport { logWarning } from '@ckeditor/ckeditor5-utils/src/ckeditorerror';\nimport verticalDotsIcon from '@ckeditor/ckeditor5-core/theme/icons/three-vertical-dots.svg';\n\nimport '../../theme/components/toolbar/toolbar.css';\n\n/**\n * The toolbar view class.\n *\n * @extends module:ui/view~View\n * @implements module:ui/dropdown/dropdownpanelfocusable~DropdownPanelFocusable\n */\nexport default class ToolbarView extends View {\n\t/**\n\t * Creates an instance of the {@link module:ui/toolbar/toolbarview~ToolbarView} class.\n\t *\n\t * Also see {@link #render}.\n\t *\n\t * @param {module:utils/locale~Locale} locale The localization services instance.\n\t * @param {module:ui/toolbar/toolbarview~ToolbarOptions} [options] Configuration options of the toolbar.\n\t */\n\tconstructor( locale, options ) {\n\t\tsuper( locale );\n\n\t\tconst bind = this.bindTemplate;\n\t\tconst t = this.t;\n\n\t\t/**\n\t\t * A reference to the options object passed to the constructor.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:ui/toolbar/toolbarview~ToolbarOptions}\n\t\t */\n\t\tthis.options = options || {};\n\n\t\t/**\n\t\t * Label used by assistive technologies to describe this toolbar element.\n\t\t *\n\t\t * @default 'Editor toolbar'\n\t\t * @member {String} #ariaLabel\n\t\t */\n\t\tthis.set( 'ariaLabel', t( 'Editor toolbar' ) );\n\n\t\t/**\n\t\t * The maximum width of the toolbar element.\n\t\t *\n\t\t * **Note**: When set to a specific value (e.g. `'200px'`), the value will affect the behavior of the\n\t\t * {@link module:ui/toolbar/toolbarview~ToolbarOptions#shouldGroupWhenFull}\n\t\t * option by changing the number of {@link #items} that will be displayed in the toolbar at a time.\n\t\t *\n\t\t * @observable\n\t\t * @default 'auto'\n\t\t * @member {String} #maxWidth\n\t\t */\n\t\tthis.set( 'maxWidth', 'auto' );\n\n\t\t/**\n\t\t * A collection of toolbar items (buttons, dropdowns, etc.).\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:ui/viewcollection~ViewCollection}\n\t\t */\n\t\tthis.items = this.createCollection();\n\n\t\t/**\n\t\t * Tracks information about the DOM focus in the toolbar.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:utils/focustracker~FocusTracker}\n\t\t */\n\t\tthis.focusTracker = new FocusTracker();\n\n\t\t/**\n\t\t * An instance of the {@link module:utils/keystrokehandler~KeystrokeHandler}\n\t\t * to handle keyboard navigation in the toolbar.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:utils/keystrokehandler~KeystrokeHandler}\n\t\t */\n\t\tthis.keystrokes = new KeystrokeHandler();\n\n\t\t/**\n\t\t * An additional CSS class added to the {@link #element}.\n\t\t *\n\t\t * @observable\n\t\t * @member {String} #class\n\t\t */\n\t\tthis.set( 'class' );\n\n\t\t/**\n\t\t * When set true, makes the toolbar look compact with {@link #element}.\n\t\t *\n\t\t * @observable\n\t\t * @default false\n\t\t * @member {String} #isCompact\n\t\t */\n\t\tthis.set( 'isCompact', false );\n\n\t\t/**\n\t\t * A (child) view containing {@link #items toolbar items}.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:ui/toolbar/toolbarview~ItemsView}\n\t\t */\n\t\tthis.itemsView = new ItemsView( locale );\n\n\t\t/**\n\t\t * A top–level collection aggregating building blocks of the toolbar.\n\t\t *\n\t\t *\t┌───────────────── ToolbarView ─────────────────┐\n\t\t *\t| ┌──────────────── #children ────────────────┐ |\n\t\t *\t| |   ┌──────────── #itemsView ───────────┐   | |\n\t\t *\t| |   | [ item1 ] [ item2 ] ... [ itemN ] |   | |\n\t\t *\t| |   └──────────────────────────────────-┘   | |\n\t\t *\t| └───────────────────────────────────────────┘ |\n\t\t *\t└───────────────────────────────────────────────┘\n\t\t *\n\t\t * By default, it contains the {@link #itemsView} but it can be extended with additional\n\t\t * UI elements when necessary.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:ui/viewcollection~ViewCollection}\n\t\t */\n\t\tthis.children = this.createCollection();\n\t\tthis.children.add( this.itemsView );\n\n\t\t/**\n\t\t * A collection of {@link #items} that take part in the focus cycling\n\t\t * (i.e. navigation using the keyboard). Usually, it contains a subset of {@link #items} with\n\t\t * some optional UI elements that also belong to the toolbar and should be focusable\n\t\t * by the user.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:ui/viewcollection~ViewCollection}\n\t\t */\n\t\tthis.focusables = this.createCollection();\n\n\t\t/**\n\t\t * Controls the orientation of toolbar items. Only available when\n\t\t * {@link module:ui/toolbar/toolbarview~ToolbarOptions#shouldGroupWhenFull dynamic items grouping}\n\t\t * is **disabled**.\n\t\t *\n\t\t * @observable\n\t\t * @member {Boolean} #isVertical\n\t\t */\n\n\t\t/**\n\t\t * Helps cycling over {@link #focusables focusable items} in the toolbar.\n\t\t *\n\t\t * @readonly\n\t\t * @protected\n\t\t * @member {module:ui/focuscycler~FocusCycler}\n\t\t */\n\t\tthis._focusCycler = new FocusCycler( {\n\t\t\tfocusables: this.focusables,\n\t\t\tfocusTracker: this.focusTracker,\n\t\t\tkeystrokeHandler: this.keystrokes,\n\t\t\tactions: {\n\t\t\t\t// Navigate toolbar items backwards using the arrow[left,up] keys.\n\t\t\t\tfocusPrevious: [ 'arrowleft', 'arrowup' ],\n\n\t\t\t\t// Navigate toolbar items forwards using the arrow[right,down] keys.\n\t\t\t\tfocusNext: [ 'arrowright', 'arrowdown' ]\n\t\t\t}\n\t\t} );\n\n\t\tconst classes = [\n\t\t\t'ck',\n\t\t\t'ck-toolbar',\n\t\t\tbind.to( 'class' ),\n\t\t\tbind.if( 'isCompact', 'ck-toolbar_compact' )\n\t\t];\n\n\t\tif ( this.options.shouldGroupWhenFull && this.options.isFloating ) {\n\t\t\tclasses.push( 'ck-toolbar_floating' );\n\t\t}\n\n\t\tthis.setTemplate( {\n\t\t\ttag: 'div',\n\t\t\tattributes: {\n\t\t\t\tclass: classes,\n\t\t\t\trole: 'toolbar',\n\t\t\t\t'aria-label': bind.to( 'ariaLabel' ),\n\t\t\t\tstyle: {\n\t\t\t\t\tmaxWidth: bind.to( 'maxWidth' )\n\t\t\t\t}\n\t\t\t},\n\n\t\t\tchildren: this.children,\n\n\t\t\ton: {\n\t\t\t\t// https://github.com/ckeditor/ckeditor5-ui/issues/206\n\t\t\t\tmousedown: preventDefault( this )\n\t\t\t}\n\t\t} );\n\n\t\t/**\n\t\t * An instance of the active toolbar behavior that shapes its look and functionality.\n\t\t *\n\t\t * See {@link module:ui/toolbar/toolbarview~ToolbarBehavior} to learn more.\n\t\t *\n\t\t * @protected\n\t\t * @readonly\n\t\t * @member {module:ui/toolbar/toolbarview~ToolbarBehavior}\n\t\t */\n\t\tthis._behavior = this.options.shouldGroupWhenFull ? new DynamicGrouping( this ) : new StaticLayout( this );\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\trender() {\n\t\tsuper.render();\n\n\t\t// Children added before rendering should be known to the #focusTracker.\n\t\tfor ( const item of this.items ) {\n\t\t\tthis.focusTracker.add( item.element );\n\t\t}\n\n\t\tthis.items.on( 'add', ( evt, item ) => {\n\t\t\tthis.focusTracker.add( item.element );\n\t\t} );\n\n\t\tthis.items.on( 'remove', ( evt, item ) => {\n\t\t\tthis.focusTracker.remove( item.element );\n\t\t} );\n\n\t\t// Start listening for the keystrokes coming from #element.\n\t\tthis.keystrokes.listenTo( this.element );\n\n\t\tthis._behavior.render( this );\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tdestroy() {\n\t\tthis._behavior.destroy();\n\n\t\treturn super.destroy();\n\t}\n\n\t/**\n\t * Focuses the first focusable in {@link #focusables}.\n\t */\n\tfocus() {\n\t\tthis._focusCycler.focusFirst();\n\t}\n\n\t/**\n\t * Focuses the last focusable in {@link #focusables}.\n\t */\n\tfocusLast() {\n\t\tthis._focusCycler.focusLast();\n\t}\n\n\t/**\n\t * A utility that expands the plain toolbar configuration into\n\t * {@link module:ui/toolbar/toolbarview~ToolbarView#items} using a given component factory.\n\t *\n\t * @param {Array.<String>} config The toolbar items configuration.\n\t * @param {module:ui/componentfactory~ComponentFactory} factory A factory producing toolbar items.\n\t */\n\tfillFromConfig( config, factory ) {\n\t\tthis.items.addMany( config.map( name => {\n\t\t\tif ( name == '|' ) {\n\t\t\t\treturn new ToolbarSeparatorView();\n\t\t\t} else if ( name == '-' ) {\n\t\t\t\tif ( this.options.shouldGroupWhenFull ) {\n\t\t\t\t\t/**\n\t\t\t\t\t * Toolbar line breaks can only work the when the automatic button grouping is disabled in the toolbar configuration.\n\t\t\t\t\t * To do this, set the `shouldNotGroupWhenFull` option to `true` in the editor configuration:\n\t\t\t\t\t *\n\t\t\t\t\t *\t\tconst config = {\n\t\t\t\t\t *\t\t\ttoolbar: {\n\t\t\t\t\t *\t\t\t\tshouldNotGroupWhenFull: true\n\t\t\t\t\t *\t\t\t}\n\t\t\t\t\t *\t\t}\n\t\t\t\t\t *\n\t\t\t\t\t * Learn more about {@link module:core/editor/editorconfig~EditorConfig#toolbar toolbar configuration}.\n\t\t\t\t\t *\n\t\t\t\t\t * @error toolbarview-line-break-ignored-when-grouping-items\n\t\t\t\t\t */\n\t\t\t\t\tlogWarning( 'toolbarview-line-break-ignored-when-grouping-items', config );\n\t\t\t\t}\n\n\t\t\t\treturn new ToolbarLineBreakView();\n\t\t\t} else if ( factory.has( name ) ) {\n\t\t\t\treturn factory.create( name );\n\t\t\t} else {\n\t\t\t\t/**\n\t\t\t\t * There was a problem processing the configuration of the toolbar. The item with the given\n\t\t\t\t * name does not exist so it was omitted when rendering the toolbar.\n\t\t\t\t *\n\t\t\t\t * This warning usually shows up when the {@link module:core/plugin~Plugin} which is supposed\n\t\t\t\t * to provide a toolbar item has not been loaded or there is a typo in the configuration.\n\t\t\t\t *\n\t\t\t\t * Make sure the plugin responsible for this toolbar item is loaded and the toolbar configuration\n\t\t\t\t * is correct, e.g. {@link module:basic-styles/bold~Bold} is loaded for the `'bold'` toolbar item.\n\t\t\t\t *\n\t\t\t\t * You can use the following snippet to retrieve all available toolbar items:\n\t\t\t\t *\n\t\t\t\t *\t\tArray.from( editor.ui.componentFactory.names() );\n\t\t\t\t *\n\t\t\t\t * @error toolbarview-item-unavailable\n\t\t\t\t * @param {String} name The name of the component.\n\t\t\t\t */\n\t\t\t\tlogWarning( 'toolbarview-item-unavailable', { name } );\n\t\t\t}\n\t\t} ).filter( item => item !== undefined ) );\n\t}\n\n\t/**\n\t * Fired when some toolbar {@link #items} were grouped or ungrouped as a result of some change\n\t * in the toolbar geometry.\n\t *\n\t * **Note**: This event is always fired **once** regardless of the number of items that were be\n\t * grouped or ungrouped at a time.\n\t *\n\t * **Note**: This event is fired only if the items grouping functionality was enabled in\n\t * the first place (see {@link module:ui/toolbar/toolbarview~ToolbarOptions#shouldGroupWhenFull}).\n\t *\n\t * @event groupedItemsUpdate\n\t */\n}\n\n/**\n * An inner block of the {@link module:ui/toolbar/toolbarview~ToolbarView} hosting its\n * {@link module:ui/toolbar/toolbarview~ToolbarView#items}.\n *\n * @private\n * @extends module:ui/view~View\n */\nclass ItemsView extends View {\n\t/**\n\t * @inheritDoc\n\t */\n\tconstructor( locale ) {\n\t\tsuper( locale );\n\n\t\t/**\n\t\t * A collection of items (buttons, dropdowns, etc.).\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:ui/viewcollection~ViewCollection}\n\t\t */\n\t\tthis.children = this.createCollection();\n\n\t\tthis.setTemplate( {\n\t\t\ttag: 'div',\n\t\t\tattributes: {\n\t\t\t\tclass: [\n\t\t\t\t\t'ck',\n\t\t\t\t\t'ck-toolbar__items'\n\t\t\t\t]\n\t\t\t},\n\t\t\tchildren: this.children\n\t\t} );\n\t}\n}\n\n/**\n * A toolbar behavior that makes it static and unresponsive to the changes of the environment.\n * At the same time, it also makes it possible to display a toolbar with a vertical layout\n * using the {@link module:ui/toolbar/toolbarview~ToolbarView#isVertical} property.\n *\n * @private\n * @implements module:ui/toolbar/toolbarview~ToolbarBehavior\n */\nclass StaticLayout {\n\t/**\n\t * Creates an instance of the {@link module:ui/toolbar/toolbarview~StaticLayout} toolbar\n\t * behavior.\n\t *\n\t * @param {module:ui/toolbar/toolbarview~ToolbarView} view An instance of the toolbar that this behavior\n\t * is added to.\n\t */\n\tconstructor( view ) {\n\t\tconst bind = view.bindTemplate;\n\n\t\t// Static toolbar can be vertical when needed.\n\t\tview.set( 'isVertical', false );\n\n\t\t// 1:1 pass–through binding, all ToolbarView#items are visible.\n\t\tview.itemsView.children.bindTo( view.items ).using( item => item );\n\n\t\t// 1:1 pass–through binding, all ToolbarView#items are focusable.\n\t\tview.focusables.bindTo( view.items ).using( item => item );\n\n\t\tview.extendTemplate( {\n\t\t\tattributes: {\n\t\t\t\tclass: [\n\t\t\t\t\t// When vertical, the toolbar has an additional CSS class.\n\t\t\t\t\tbind.if( 'isVertical', 'ck-toolbar_vertical' )\n\t\t\t\t]\n\t\t\t}\n\t\t} );\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\trender() {}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tdestroy() {}\n}\n\n/**\n * A toolbar behavior that makes the items respond to changes in the geometry.\n *\n * In a nutshell, it groups {@link module:ui/toolbar/toolbarview~ToolbarView#items}\n * that do not fit visually into a single row of the toolbar (due to limited space).\n * Items that do not fit are aggregated in a dropdown displayed at the end of the toolbar.\n *\n *\t┌──────────────────────────────────────── ToolbarView ──────────────────────────────────────────┐\n *\t| ┌─────────────────────────────────────── #children ─────────────────────────────────────────┐ |\n *\t| |   ┌─────── #itemsView ────────┐ ┌──────────────────────┐ ┌── #groupedItemsDropdown ───┐   | |\n *\t| |   |       #ungroupedItems     | | ToolbarSeparatorView | |        #groupedItems       |   | |\n *\t| |   └──────────────────────────-┘ └──────────────────────┘ └────────────────────────────┘   | |\n *\t| |                                  \\---------- only when toolbar items overflow --------/    | |\n *\t| └───────────────────────────────────────────────────────────────────────────────────────────┘ |\n *\t└───────────────────────────────────────────────────────────────────────────────────────────────┘\n *\n * @private\n * @implements module:ui/toolbar/toolbarview~ToolbarBehavior\n */\nclass DynamicGrouping {\n\t/**\n\t * Creates an instance of the {@link module:ui/toolbar/toolbarview~DynamicGrouping} toolbar\n\t * behavior.\n\t *\n\t * @param {module:ui/toolbar/toolbarview~ToolbarView} view An instance of the toolbar that this behavior\n\t * is added to.\n\t */\n\tconstructor( view ) {\n\t\t/**\n\t\t * A toolbar view this behavior belongs to.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:ui/toolbar~ToolbarView}\n\t\t */\n\t\tthis.view = view;\n\n\t\t/**\n\t\t * A collection of toolbar children.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:ui/viewcollection~ViewCollection}\n\t\t */\n\t\tthis.viewChildren = view.children;\n\n\t\t/**\n\t\t * A collection of focusable toolbar elements.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:ui/viewcollection~ViewCollection}\n\t\t */\n\t\tthis.viewFocusables = view.focusables;\n\n\t\t/**\n\t\t * A view containing toolbar items.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:ui/toolbar/toolbarview~ItemsView}\n\t\t */\n\t\tthis.viewItemsView = view.itemsView;\n\n\t\t/**\n\t\t * Toolbar focus tracker.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:utils/focustracker~FocusTracker}\n\t\t */\n\t\tthis.viewFocusTracker = view.focusTracker;\n\n\t\t/**\n\t\t * Toolbar locale.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:utils/locale~Locale}\n\t\t */\n\t\tthis.viewLocale = view.locale;\n\n\t\t/**\n\t\t * Toolbar element.\n\t\t *\n\t\t * @readonly\n\t\t * @member {HTMLElement} #viewElement\n\t\t */\n\n\t\t/**\n\t\t * A subset of toolbar {@link module:ui/toolbar/toolbarview~ToolbarView#items}.\n\t\t * Aggregates items that fit into a single row of the toolbar and were not {@link #groupedItems grouped}\n\t\t * into a {@link #groupedItemsDropdown dropdown}. Items of this collection are displayed in the\n\t\t * {@link module:ui/toolbar/toolbarview~ToolbarView#itemsView}.\n\t\t *\n\t\t * When none of the {@link module:ui/toolbar/toolbarview~ToolbarView#items} were grouped, it\n\t\t * matches the {@link module:ui/toolbar/toolbarview~ToolbarView#items} collection in size and order.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:ui/viewcollection~ViewCollection}\n\t\t */\n\t\tthis.ungroupedItems = view.createCollection();\n\n\t\t/**\n\t\t * A subset of toolbar {@link module:ui/toolbar/toolbarview~ToolbarView#items}.\n\t\t * A collection of the toolbar items that do not fit into a single row of the toolbar.\n\t\t * Grouped items are displayed in a dedicated {@link #groupedItemsDropdown dropdown}.\n\t\t *\n\t\t * When none of the {@link module:ui/toolbar/toolbarview~ToolbarView#items} were grouped,\n\t\t * this collection is empty.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:ui/viewcollection~ViewCollection}\n\t\t */\n\t\tthis.groupedItems = view.createCollection();\n\n\t\t/**\n\t\t * The dropdown that aggregates {@link #groupedItems grouped items} that do not fit into a single\n\t\t * row of the toolbar. It is displayed on demand as the last of\n\t\t * {@link module:ui/toolbar/toolbarview~ToolbarView#children toolbar children} and offers another\n\t\t * (nested) toolbar which displays items that would normally overflow.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:ui/dropdown/dropdownview~DropdownView}\n\t\t */\n\t\tthis.groupedItemsDropdown = this._createGroupedItemsDropdown();\n\n\t\t/**\n\t\t * An instance of the resize observer that helps dynamically determine the geometry of the toolbar\n\t\t * and manage items that do not fit into a single row.\n\t\t *\n\t\t * **Note:** Created in {@link #_enableGroupingOnResize}.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:utils/dom/resizeobserver~ResizeObserver}\n\t\t */\n\t\tthis.resizeObserver = null;\n\n\t\t/**\n\t\t * A cached value of the horizontal padding style used by {@link #_updateGrouping}\n\t\t * to manage the {@link module:ui/toolbar/toolbarview~ToolbarView#items} that do not fit into\n\t\t * a single toolbar line. This value can be reused between updates because it is unlikely that\n\t\t * the padding will change and re–using `Window.getComputedStyle()` is expensive.\n\t\t *\n\t\t * @readonly\n\t\t * @member {Number}\n\t\t */\n\t\tthis.cachedPadding = null;\n\n\t\t/**\n\t\t * A flag indicating that an items grouping update has been queued (e.g. due to the toolbar being visible)\n\t\t * and should be executed immediately the next time the toolbar shows up.\n\t\t *\n\t\t * @readonly\n\t\t * @member {Boolean}\n\t\t */\n\t\tthis.shouldUpdateGroupingOnNextResize = false;\n\n\t\t// Only those items that were not grouped are visible to the user.\n\t\tview.itemsView.children.bindTo( this.ungroupedItems ).using( item => item );\n\n\t\t// Make sure all #items visible in the main space of the toolbar are \"focuscycleable\".\n\t\tthis.ungroupedItems.on( 'add', this._updateFocusCycleableItems.bind( this ) );\n\t\tthis.ungroupedItems.on( 'remove', this._updateFocusCycleableItems.bind( this ) );\n\n\t\t// Make sure the #groupedItemsDropdown is also included in cycling when it appears.\n\t\tview.children.on( 'add', this._updateFocusCycleableItems.bind( this ) );\n\t\tview.children.on( 'remove', this._updateFocusCycleableItems.bind( this ) );\n\n\t\t// ToolbarView#items is dynamic. When an item is added or removed, it should be automatically\n\t\t// represented in either grouped or ungrouped items at the right index.\n\t\t// In other words #items == concat( #ungroupedItems, #groupedItems )\n\t\t// (in length and order).\n\t\tview.items.on( 'change', ( evt, changeData ) => {\n\t\t\tconst index = changeData.index;\n\n\t\t\t// Removing.\n\t\t\tfor ( const removedItem of changeData.removed ) {\n\t\t\t\tif ( index >= this.ungroupedItems.length ) {\n\t\t\t\t\tthis.groupedItems.remove( removedItem );\n\t\t\t\t} else {\n\t\t\t\t\tthis.ungroupedItems.remove( removedItem );\n\t\t\t\t}\n\t\t\t}\n\n\t\t\t// Adding.\n\t\t\tfor ( let currentIndex = index; currentIndex < index + changeData.added.length; currentIndex++ ) {\n\t\t\t\tconst addedItem = changeData.added[ currentIndex - index ];\n\n\t\t\t\tif ( currentIndex > this.ungroupedItems.length ) {\n\t\t\t\t\tthis.groupedItems.add( addedItem, currentIndex - this.ungroupedItems.length );\n\t\t\t\t} else {\n\t\t\t\t\tthis.ungroupedItems.add( addedItem, currentIndex );\n\t\t\t\t}\n\t\t\t}\n\n\t\t\t// When new ungrouped items join in and land in #ungroupedItems, there's a chance it causes\n\t\t\t// the toolbar to overflow.\n\t\t\t// Consequently if removed from grouped or ungrouped items, there is a chance\n\t\t\t// some new space is available and we could do some ungrouping.\n\t\t\tthis._updateGrouping();\n\t\t} );\n\n\t\tview.extendTemplate( {\n\t\t\tattributes: {\n\t\t\t\tclass: [\n\t\t\t\t\t// To group items dynamically, the toolbar needs a dedicated CSS class.\n\t\t\t\t\t'ck-toolbar_grouping'\n\t\t\t\t]\n\t\t\t}\n\t\t} );\n\t}\n\n\t/**\n\t * Enables dynamic items grouping based on the dimensions of the toolbar.\n\t *\n\t * @param {module:ui/toolbar/toolbarview~ToolbarView} view An instance of the toolbar that this behavior\n\t * is added to.\n\t */\n\trender( view ) {\n\t\tthis.viewElement = view.element;\n\n\t\tthis._enableGroupingOnResize();\n\t\tthis._enableGroupingOnMaxWidthChange( view );\n\t}\n\n\t/**\n\t * Cleans up the internals used by this behavior.\n\t */\n\tdestroy() {\n\t\t// The dropdown may not be in ToolbarView#children at the moment of toolbar destruction\n\t\t// so let's make sure it's actually destroyed along with the toolbar.\n\t\tthis.groupedItemsDropdown.destroy();\n\n\t\tthis.resizeObserver.destroy();\n\t}\n\n\t/**\n\t * When called, it will check if any of the {@link #ungroupedItems} do not fit into a single row of the toolbar,\n\t * and it will move them to the {@link #groupedItems} when it happens.\n\t *\n\t * At the same time, it will also check if there is enough space in the toolbar for the first of the\n\t * {@link #groupedItems} to be returned back to {@link #ungroupedItems} and still fit into a single row\n\t * without the toolbar wrapping.\n\t *\n\t * @protected\n\t */\n\t_updateGrouping() {\n\t\t// Do no grouping–related geometry analysis when the toolbar is detached from visible DOM,\n\t\t// for instance before #render(), or after render but without a parent or a parent detached\n\t\t// from DOM. DOMRects won't work anyway and there will be tons of warning in the console and\n\t\t// nothing else. This happens, for instance, when the toolbar is detached from DOM and\n\t\t// some logic adds or removes its #items.\n\t\tif ( !this.viewElement.ownerDocument.body.contains( this.viewElement ) ) {\n\t\t\treturn;\n\t\t}\n\n\t\t// Do not update grouping when the element is invisible. Such toolbar has DOMRect filled with zeros\n\t\t// and that would cause all items to be grouped. Instead, queue the grouping so it runs next time\n\t\t// the toolbar is visible (the next ResizeObserver callback execution). This is handy because\n\t\t// the grouping could be caused by increasing the #maxWidth when the toolbar was invisible and the next\n\t\t// time it shows up, some items could actually be ungrouped (https://github.com/ckeditor/ckeditor5/issues/6575).\n\t\tif ( !this.viewElement.offsetParent ) {\n\t\t\tthis.shouldUpdateGroupingOnNextResize = true;\n\n\t\t\treturn;\n\t\t}\n\n\t\t// Remember how many items were initially grouped so at the it is possible to figure out if the number\n\t\t// of grouped items has changed. If the number has changed, geometry of the toolbar has also changed.\n\t\tconst initialGroupedItemsCount = this.groupedItems.length;\n\t\tlet wereItemsGrouped;\n\n\t\t// Group #items as long as some wrap to the next row. This will happen, for instance,\n\t\t// when the toolbar is getting narrow and there is not enough space to display all items in\n\t\t// a single row.\n\t\twhile ( this._areItemsOverflowing ) {\n\t\t\tthis._groupLastItem();\n\n\t\t\twereItemsGrouped = true;\n\t\t}\n\n\t\t// If none were grouped now but there were some items already grouped before,\n\t\t// then, what the hell, maybe let's see if some of them can be ungrouped. This happens when,\n\t\t// for instance, the toolbar is stretching and there's more space in it than before.\n\t\tif ( !wereItemsGrouped && this.groupedItems.length ) {\n\t\t\t// Ungroup items as long as none are overflowing or there are none to ungroup left.\n\t\t\twhile ( this.groupedItems.length && !this._areItemsOverflowing ) {\n\t\t\t\tthis._ungroupFirstItem();\n\t\t\t}\n\n\t\t\t// If the ungrouping ended up with some item wrapping to the next row,\n\t\t\t// put it back to the group toolbar (\"undo the last ungroup\"). We don't know whether\n\t\t\t// an item will wrap or not until we ungroup it (that's a DOM/CSS thing) so this\n\t\t\t// clean–up is vital for the algorithm.\n\t\t\tif ( this._areItemsOverflowing ) {\n\t\t\t\tthis._groupLastItem();\n\t\t\t}\n\t\t}\n\n\t\tif ( this.groupedItems.length !== initialGroupedItemsCount ) {\n\t\t\tthis.view.fire( 'groupedItemsUpdate' );\n\t\t}\n\t}\n\n\t/**\n\t * Returns `true` when {@link module:ui/toolbar/toolbarview~ToolbarView#element} children visually overflow,\n\t * for instance if the toolbar is narrower than its members. Returns `false` otherwise.\n\t *\n\t * @private\n\t * @type {Boolean}\n\t */\n\tget _areItemsOverflowing() {\n\t\t// An empty toolbar cannot overflow.\n\t\tif ( !this.ungroupedItems.length ) {\n\t\t\treturn false;\n\t\t}\n\n\t\tconst element = this.viewElement;\n\t\tconst uiLanguageDirection = this.viewLocale.uiLanguageDirection;\n\t\tconst lastChildRect = new Rect( element.lastChild );\n\t\tconst toolbarRect = new Rect( element );\n\n\t\tif ( !this.cachedPadding ) {\n\t\t\tconst computedStyle = global.window.getComputedStyle( element );\n\t\t\tconst paddingProperty = uiLanguageDirection === 'ltr' ? 'paddingRight' : 'paddingLeft';\n\n\t\t\t// parseInt() is essential because of quirky floating point numbers logic and DOM.\n\t\t\t// If the padding turned out too big because of that, the grouped items dropdown would\n\t\t\t// always look (from the Rect perspective) like it overflows (while it's not).\n\t\t\tthis.cachedPadding = Number.parseInt( computedStyle[ paddingProperty ] );\n\t\t}\n\n\t\tif ( uiLanguageDirection === 'ltr' ) {\n\t\t\treturn lastChildRect.right > toolbarRect.right - this.cachedPadding;\n\t\t} else {\n\t\t\treturn lastChildRect.left < toolbarRect.left + this.cachedPadding;\n\t\t}\n\t}\n\n\t/**\n\t * Enables the functionality that prevents {@link #ungroupedItems} from overflowing (wrapping to the next row)\n\t * upon resize when there is little space available. Instead, the toolbar items are moved to the\n\t * {@link #groupedItems} collection and displayed in a dropdown at the end of the row (which has its own nested toolbar).\n\t *\n\t * When called, the toolbar will automatically analyze the location of its {@link #ungroupedItems} and \"group\"\n\t * them in the dropdown if necessary. It will also observe the browser window for size changes in\n\t * the future and respond to them by grouping more items or reverting already grouped back, depending\n\t * on the visual space available.\n\t *\n\t * @private\n\t */\n\t_enableGroupingOnResize() {\n\t\tlet previousWidth;\n\n\t\t// TODO: Consider debounce.\n\t\tthis.resizeObserver = new ResizeObserver( this.viewElement, entry => {\n\t\t\tif ( !previousWidth || previousWidth !== entry.contentRect.width || this.shouldUpdateGroupingOnNextResize ) {\n\t\t\t\tthis.shouldUpdateGroupingOnNextResize = false;\n\n\t\t\t\tthis._updateGrouping();\n\n\t\t\t\tpreviousWidth = entry.contentRect.width;\n\t\t\t}\n\t\t} );\n\n\t\tthis._updateGrouping();\n\t}\n\n\t/**\n\t * Enables the grouping functionality, just like {@link #_enableGroupingOnResize} but the difference is that\n\t * it listens to the changes of {@link module:ui/toolbar/toolbarview~ToolbarView#maxWidth} instead.\n\t *\n\t * @private\n\t */\n\t_enableGroupingOnMaxWidthChange( view ) {\n\t\tview.on( 'change:maxWidth', () => {\n\t\t\tthis._updateGrouping();\n\t\t} );\n\t}\n\n\t/**\n\t * When called, it will remove the last item from {@link #ungroupedItems} and move it back\n\t * to the {@link #groupedItems} collection.\n\t *\n\t * The opposite of {@link #_ungroupFirstItem}.\n\t *\n\t * @private\n\t */\n\t_groupLastItem() {\n\t\tif ( !this.groupedItems.length ) {\n\t\t\tthis.viewChildren.add( new ToolbarSeparatorView() );\n\t\t\tthis.viewChildren.add( this.groupedItemsDropdown );\n\t\t\tthis.viewFocusTracker.add( this.groupedItemsDropdown.element );\n\t\t}\n\n\t\tthis.groupedItems.add( this.ungroupedItems.remove( this.ungroupedItems.last ), 0 );\n\t}\n\n\t/**\n\t * Moves the very first item belonging to {@link #groupedItems} back\n\t * to the {@link #ungroupedItems} collection.\n\t *\n\t * The opposite of {@link #_groupLastItem}.\n\t *\n\t * @private\n\t */\n\t_ungroupFirstItem() {\n\t\tthis.ungroupedItems.add( this.groupedItems.remove( this.groupedItems.first ) );\n\n\t\tif ( !this.groupedItems.length ) {\n\t\t\tthis.viewChildren.remove( this.groupedItemsDropdown );\n\t\t\tthis.viewChildren.remove( this.viewChildren.last );\n\t\t\tthis.viewFocusTracker.remove( this.groupedItemsDropdown.element );\n\t\t}\n\t}\n\n\t/**\n\t * Creates the {@link #groupedItemsDropdown} that hosts the members of the {@link #groupedItems}\n\t * collection when there is not enough space in the toolbar to display all items in a single row.\n\t *\n\t * @private\n\t * @returns {module:ui/dropdown/dropdownview~DropdownView}\n\t */\n\t_createGroupedItemsDropdown() {\n\t\tconst locale = this.viewLocale;\n\t\tconst t = locale.t;\n\t\tconst dropdown = createDropdown( locale );\n\n\t\tdropdown.class = 'ck-toolbar__grouped-dropdown';\n\n\t\t// Make sure the dropdown never sticks out to the left/right. It should be under the main toolbar.\n\t\t// (https://github.com/ckeditor/ckeditor5/issues/5608)\n\t\tdropdown.panelPosition = locale.uiLanguageDirection === 'ltr' ? 'sw' : 'se';\n\n\t\taddToolbarToDropdown( dropdown, [] );\n\n\t\tdropdown.buttonView.set( {\n\t\t\tlabel: t( 'Show more items' ),\n\t\t\ttooltip: true,\n\t\t\ticon: verticalDotsIcon\n\t\t} );\n\n\t\t// 1:1 pass–through binding.\n\t\tdropdown.toolbarView.items.bindTo( this.groupedItems ).using( item => item );\n\n\t\treturn dropdown;\n\t}\n\n\t/**\n\t * Updates the {@link module:ui/toolbar/toolbarview~ToolbarView#focusables focus–cycleable items}\n\t * collection so it represents the up–to–date state of the UI from the perspective of the user.\n\t *\n\t * For instance, the {@link #groupedItemsDropdown} can show up and hide but when it is visible,\n\t * it must be subject to focus cycling in the toolbar.\n\t *\n\t * See the {@link module:ui/toolbar/toolbarview~ToolbarView#focusables collection} documentation\n\t * to learn more about the purpose of this method.\n\t *\n\t * @private\n\t */\n\t_updateFocusCycleableItems() {\n\t\tthis.viewFocusables.clear();\n\n\t\tthis.ungroupedItems.map( item => {\n\t\t\tthis.viewFocusables.add( item );\n\t\t} );\n\n\t\tif ( this.groupedItems.length ) {\n\t\t\tthis.viewFocusables.add( this.groupedItemsDropdown );\n\t\t}\n\t}\n}\n\n/**\n * Options passed to the {@link module:ui/toolbar/toolbarview~ToolbarView#constructor} of the toolbar.\n *\n * @interface module:ui/toolbar/toolbarview~ToolbarOptions\n */\n\n/**\n * When set to `true`, the toolbar will automatically group {@link module:ui/toolbar/toolbarview~ToolbarView#items} that\n * would normally wrap to the next line when there is not enough space to display them in a single row, for\n * instance, if the parent container of the toolbar is narrow. For toolbars in absolutely positioned containers\n * without width restrictions also the {@link module:ui/toolbar/toolbarview~ToolbarOptions#isFloating} option is required to be `true`.\n *\n * See also: {@link module:ui/toolbar/toolbarview~ToolbarView#maxWidth}.\n *\n * @member {Boolean} module:ui/toolbar/toolbarview~ToolbarOptions#shouldGroupWhenFull\n */\n\n/**\n * This option should be enabled for toolbars in absolutely positioned containers without width restrictions\n * to enable automatic {@link module:ui/toolbar/toolbarview~ToolbarView#items} grouping.\n * When this option is set to `true`, the items will stop wrapping to the next line\n * and together with {@link module:ui/toolbar/toolbarview~ToolbarOptions#shouldGroupWhenFull}\n * this will allow grouping them when there is not enough space in a single row.\n *\n * @member {Boolean} module:ui/toolbar/toolbarview~ToolbarOptions#isFloating\n */\n\n/**\n * A class interface defining the behavior of the {@link module:ui/toolbar/toolbarview~ToolbarView}.\n *\n * Toolbar behaviors extend its look and functionality and have an impact on the\n * {@link module:ui/toolbar/toolbarview~ToolbarView#element} template or\n * {@link module:ui/toolbar/toolbarview~ToolbarView#render rendering}. They can be enabled\n * conditionally, e.g. depending on the configuration of the toolbar.\n *\n * @private\n * @interface module:ui/toolbar/toolbarview~ToolbarBehavior\n */\n\n/**\n * Creates a new toolbar behavior instance.\n *\n * The instance is created in the {@link module:ui/toolbar/toolbarview~ToolbarView#constructor} of the toolbar.\n * This is the right place to extend the {@link module:ui/toolbar/toolbarview~ToolbarView#template} of\n * the toolbar, define extra toolbar properties, etc.\n *\n * @method #constructor\n * @param {module:ui/toolbar/toolbarview~ToolbarView} view An instance of the toolbar that this behavior is added to.\n */\n\n/**\n * A method called after the toolbar has been {@link module:ui/toolbar/toolbarview~ToolbarView#render rendered}.\n * It can be used to, for example, customize the behavior of the toolbar when its {@link module:ui/toolbar/toolbarview~ToolbarView#element}\n * is available.\n *\n * @readonly\n * @member {Function} #render\n * @param {module:ui/toolbar/toolbarview~ToolbarView} view An instance of the toolbar being rendered.\n */\n\n/**\n * A method called after the toolbar has been {@link module:ui/toolbar/toolbarview~ToolbarView#destroy destroyed}.\n * It allows cleaning up after the toolbar behavior, for instance, this is the right place to detach\n * event listeners, free up references, etc.\n *\n * @readonly\n * @member {Function} #destroy\n */\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module ui/bindings/preventdefault\n */\n\n/**\n * A helper which executes a native `Event.preventDefault()` if the target of an event equals the\n * {@link module:ui/view~View#element element of the view}. It shortens the definition of a\n * {@link module:ui/view~View#template template}.\n *\n *\t\t// In a class extending View.\n *\t\timport preventDefault from '@ckeditor/ckeditor5-ui/src/bindings/preventdefault';\n *\n *\t\t// ...\n *\n *\t\tthis.setTemplate( {\n *\t\t\ttag: 'div',\n *\n *\t\t\ton: {\n *\t\t\t\t// Prevent the default mousedown action on this view.\n *\t\t\t\tmousedown: preventDefault( this )\n *\t\t\t}\n *\t\t} );\n *\n * @param {module:ui/view~View} view View instance that defines the template.\n * @returns {module:ui/template~TemplateToBinding}\n */\nexport default function preventDefault( view ) {\n\treturn view.bindTemplate.to( evt => {\n\t\tif ( evt.target === view.element ) {\n\t\t\tevt.preventDefault();\n\t\t}\n\t} );\n}\n","import api from \"!../../../style-loader/dist/runtime/injectStylesIntoStyleTag.js\";\n            import content from \"!!../../../css-loader/dist/cjs.js!../../../postcss-loader/dist/cjs.js??ref--5-2!./classiceditor.css\";\n\nvar options = {\"injectType\":\"singletonStyleTag\",\"attributes\":{\"data-cke\":true}};\n\noptions.insert = \"head\";\noptions.singleton = true;\n\nvar update = api(content, options);\n\n\n\nexport default content.locals || {};","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module editor-classic/classiceditoruiview\n */\n\nimport BoxedEditorUIView from '@ckeditor/ckeditor5-ui/src/editorui/boxed/boxededitoruiview';\nimport InlineEditableUIView from '@ckeditor/ckeditor5-ui/src/editableui/inline/inlineeditableuiview';\nimport StickyPanelView from '@ckeditor/ckeditor5-ui/src/panel/sticky/stickypanelview';\nimport ToolbarView from '@ckeditor/ckeditor5-ui/src/toolbar/toolbarview';\n\nimport '../theme/classiceditor.css';\n\n/**\n * Classic editor UI view. Uses an inline editable and a sticky toolbar, all\n * enclosed in a boxed UI view.\n *\n * @extends module:ui/editorui/boxed/boxededitoruiview~BoxedEditorUIView\n */\nexport default class ClassicEditorUIView extends BoxedEditorUIView {\n\t/**\n\t * Creates an instance of the classic editor UI view.\n\t *\n\t * @param {module:utils/locale~Locale} locale The {@link module:core/editor/editor~Editor#locale} instance.\n\t * @param {module:engine/view/view~View} editingView The editing view instance this view is related to.\n\t * @param {Object} [options={}] Configuration options fo the view instance.\n\t * @param {Boolean} [options.shouldToolbarGroupWhenFull] When set `true` enables automatic items grouping\n\t * in the main {@link module:editor-classic/classiceditoruiview~ClassicEditorUIView#toolbar toolbar}.\n\t * See {@link module:ui/toolbar/toolbarview~ToolbarOptions#shouldGroupWhenFull} to learn more.\n\t */\n\tconstructor( locale, editingView, options = {} ) {\n\t\tsuper( locale );\n\n\t\t/**\n\t\t * Sticky panel view instance. This is a parent view of a {@link #toolbar}\n\t\t * that makes toolbar sticky.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:ui/panel/sticky/stickypanelview~StickyPanelView}\n\t\t */\n\t\tthis.stickyPanel = new StickyPanelView( locale );\n\n\t\t/**\n\t\t * Toolbar view instance.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:ui/toolbar/toolbarview~ToolbarView}\n\t\t */\n\t\tthis.toolbar = new ToolbarView( locale, {\n\t\t\tshouldGroupWhenFull: options.shouldToolbarGroupWhenFull\n\t\t} );\n\n\t\t/**\n\t\t * Editable UI view.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:ui/editableui/inline/inlineeditableuiview~InlineEditableUIView}\n\t\t */\n\t\tthis.editable = new InlineEditableUIView( locale, editingView );\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\trender() {\n\t\tsuper.render();\n\n\t\t// Set toolbar as a child of a stickyPanel and makes toolbar sticky.\n\t\tthis.stickyPanel.content.add( this.toolbar );\n\n\t\tthis.top.add( this.stickyPanel );\n\t\tthis.main.add( this.editable );\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module editor-classic/classiceditor\n */\n\nimport Editor from '@ckeditor/ckeditor5-core/src/editor/editor';\nimport DataApiMixin from '@ckeditor/ckeditor5-core/src/editor/utils/dataapimixin';\nimport ElementApiMixin from '@ckeditor/ckeditor5-core/src/editor/utils/elementapimixin';\nimport attachToForm from '@ckeditor/ckeditor5-core/src/editor/utils/attachtoform';\nimport HtmlDataProcessor from '@ckeditor/ckeditor5-engine/src/dataprocessor/htmldataprocessor';\nimport ClassicEditorUI from './classiceditorui';\nimport ClassicEditorUIView from './classiceditoruiview';\nimport getDataFromElement from '@ckeditor/ckeditor5-utils/src/dom/getdatafromelement';\nimport mix from '@ckeditor/ckeditor5-utils/src/mix';\nimport { isElement } from 'lodash-es';\nimport CKEditorError from '@ckeditor/ckeditor5-utils/src/ckeditorerror';\n\n/**\n * The {@glink builds/guides/overview#classic-editor classic editor} implementation.\n * It uses an inline editable and a sticky toolbar, all enclosed in a boxed UI.\n * See the {@glink examples/builds/classic-editor demo}.\n *\n * In order to create a classic editor instance, use the static\n * {@link module:editor-classic/classiceditor~ClassicEditor.create `ClassicEditor.create()`} method.\n *\n * # Classic editor and classic build\n *\n * The classic editor can be used directly from source (if you installed the\n * [`@ckeditor/ckeditor5-editor-classic`](https://www.npmjs.com/package/@ckeditor/ckeditor5-editor-classic) package)\n * but it is also available in the {@glink builds/guides/overview#classic-editor classic build}.\n *\n * {@glink builds/guides/overview Builds} are ready-to-use editors with plugins bundled in. When using the editor from\n * source you need to take care of loading all plugins by yourself\n * (through the {@link module:core/editor/editorconfig~EditorConfig#plugins `config.plugins`} option).\n * Using the editor from source gives much better flexibility and allows easier customization.\n *\n * Read more about initializing the editor from source or as a build in\n * {@link module:editor-classic/classiceditor~ClassicEditor.create `ClassicEditor.create()`}.\n *\n * @mixes module:core/editor/utils/dataapimixin~DataApiMixin\n * @mixes module:core/editor/utils/elementapimixin~ElementApiMixin\n * @implements module:core/editor/editorwithui~EditorWithUI\n * @extends module:core/editor/editor~Editor\n */\nexport default class ClassicEditor extends Editor {\n\t/**\n\t * Creates an instance of the classic editor.\n\t *\n\t * **Note:** do not use the constructor to create editor instances. Use the static\n\t * {@link module:editor-classic/classiceditor~ClassicEditor.create `ClassicEditor.create()`} method instead.\n\t *\n\t * @protected\n\t * @param {HTMLElement|String} sourceElementOrData The DOM element that will be the source for the created editor\n\t * or the editor's initial data. For more information see\n\t * {@link module:editor-classic/classiceditor~ClassicEditor.create `ClassicEditor.create()`}.\n\t * @param {module:core/editor/editorconfig~EditorConfig} config The editor configuration.\n\t */\n\tconstructor( sourceElementOrData, config ) {\n\t\tsuper( config );\n\n\t\tif ( isElement( sourceElementOrData ) ) {\n\t\t\tthis.sourceElement = sourceElementOrData;\n\t\t}\n\n\t\tthis.data.processor = new HtmlDataProcessor( this.data.viewDocument );\n\n\t\tthis.model.document.createRoot();\n\n\t\tconst shouldToolbarGroupWhenFull = !this.config.get( 'toolbar.shouldNotGroupWhenFull' );\n\t\tconst view = new ClassicEditorUIView( this.locale, this.editing.view, {\n\t\t\tshouldToolbarGroupWhenFull\n\t\t} );\n\n\t\tthis.ui = new ClassicEditorUI( this, view );\n\n\t\tattachToForm( this );\n\t}\n\n\t/**\n\t * Destroys the editor instance, releasing all resources used by it.\n\t *\n\t * Updates the editor's source element with the data.\n\t *\n\t * @returns {Promise}\n\t */\n\tdestroy() {\n\t\tif ( this.sourceElement ) {\n\t\t\tthis.updateSourceElement();\n\t\t}\n\n\t\tthis.ui.destroy();\n\n\t\treturn super.destroy();\n\t}\n\n\t/**\n\t * Creates a new classic editor instance.\n\t *\n\t * There are three ways how the editor can be initialized.\n\t *\n\t * # Replacing a DOM element (and loading data from it)\n\t *\n\t * You can initialize the editor using an existing DOM element:\n\t *\n\t *\t\tClassicEditor\n\t *\t\t\t.create( document.querySelector( '#editor' ) )\n\t *\t\t\t.then( editor => {\n\t *\t\t\t\tconsole.log( 'Editor was initialized', editor );\n\t *\t\t\t} )\n\t *\t\t\t.catch( err => {\n\t *\t\t\t\tconsole.error( err.stack );\n\t *\t\t\t} );\n\t *\n\t * The element's content will be used as the editor data and the element will be replaced by the editor UI.\n\t *\n\t * # Creating a detached editor\n\t *\n\t * Alternatively, you can initialize the editor by passing the initial data directly as a string.\n\t * In this case, the editor will render an element that must be inserted into the DOM:\n\t *\n\t *\t\tClassicEditor\n\t *\t\t\t.create( '<p>Hello world!</p>' )\n\t *\t\t\t.then( editor => {\n\t *\t\t\t\tconsole.log( 'Editor was initialized', editor );\n\t *\n\t *\t\t\t\t// Initial data was provided so the editor UI element needs to be added manually to the DOM.\n\t *\t\t\t\tdocument.body.appendChild( editor.ui.element );\n\t *\t\t\t} )\n\t *\t\t\t.catch( err => {\n\t *\t\t\t\tconsole.error( err.stack );\n\t *\t\t\t} );\n\t *\n\t * This lets you dynamically append the editor to your web page whenever it is convenient for you. You may use this method if your\n\t * web page content is generated on the client side and the DOM structure is not ready at the moment when you initialize the editor.\n\t *\n\t * # Replacing a DOM element (and data provided in `config.initialData`)\n\t *\n\t * You can also mix these two ways by providing a DOM element to be used and passing the initial data through the configuration:\n\t *\n\t *\t\tClassicEditor\n\t *\t\t\t.create( document.querySelector( '#editor' ), {\n\t *\t\t\t\tinitialData: '<h2>Initial data</h2><p>Foo bar.</p>'\n\t *\t\t\t} )\n\t *\t\t\t.then( editor => {\n\t *\t\t\t\tconsole.log( 'Editor was initialized', editor );\n\t *\t\t\t} )\n\t *\t\t\t.catch( err => {\n\t *\t\t\t\tconsole.error( err.stack );\n\t *\t\t\t} );\n\t *\n\t * This method can be used to initialize the editor on an existing element with the specified content in case if your integration\n\t * makes it difficult to set the content of the source element.\n\t *\n\t * Note that an error will be thrown if you pass the initial data both as the first parameter and also in the configuration.\n\t *\n\t * # Configuring the editor\n\t *\n\t * See the {@link module:core/editor/editorconfig~EditorConfig editor configuration documentation} to learn more about\n\t * customizing plugins, toolbar and more.\n\t *\n\t * # Using the editor from source\n\t *\n\t * The code samples listed in the previous sections of this documentation assume that you are using an\n\t * {@glink builds/guides/overview editor build} (for example – `@ckeditor/ckeditor5-build-classic`).\n\t *\n\t * If you want to use the classic editor from source (`@ckeditor/ckeditor5-editor-classic/src/classiceditor`),\n\t * you need to define the list of\n\t * {@link module:core/editor/editorconfig~EditorConfig#plugins plugins to be initialized} and\n\t * {@link module:core/editor/editorconfig~EditorConfig#toolbar toolbar items}. Read more about using the editor from\n\t * source in the {@glink builds/guides/integration/advanced-setup \"Advanced setup\" guide}.\n\t *\n\t * @param {HTMLElement|String} sourceElementOrData The DOM element that will be the source for the created editor\n\t * or the editor's initial data.\n\t *\n\t * If a DOM element is passed, its content will be automatically loaded to the editor upon initialization\n\t * and the {@link module:editor-classic/classiceditorui~ClassicEditorUI#element editor element} will replace the passed element\n\t * in the DOM (the original one will be hidden and the editor will be injected next to it).\n\t *\n\t * Moreover, the editor data will be set back to the original element once the editor is destroyed and when a form, in which\n\t * this element is contained, is submitted (if the original element is a `<textarea>`). This ensures seamless integration with native\n\t * web forms.\n\t *\n\t * If the initial data is passed, a detached editor will be created. In this case you need to insert it into the DOM manually.\n\t * It is available under the {@link module:editor-classic/classiceditorui~ClassicEditorUI#element `editor.ui.element`} property.\n\t *\n\t * @param {module:core/editor/editorconfig~EditorConfig} [config] The editor configuration.\n\t * @returns {Promise} A promise resolved once the editor is ready. The promise resolves with the created editor instance.\n\t */\n\tstatic create( sourceElementOrData, config = {} ) {\n\t\treturn new Promise( resolve => {\n\t\t\tconst editor = new this( sourceElementOrData, config );\n\n\t\t\tresolve(\n\t\t\t\teditor.initPlugins()\n\t\t\t\t\t.then( () => editor.ui.init( isElement( sourceElementOrData ) ? sourceElementOrData : null ) )\n\t\t\t\t\t.then( () => {\n\t\t\t\t\t\tif ( !isElement( sourceElementOrData ) && config.initialData ) {\n\t\t\t\t\t\t\t// Documented in core/editor/editorconfig.jdoc.\n\t\t\t\t\t\t\t// eslint-disable-next-line ckeditor5-rules/ckeditor-error-message\n\t\t\t\t\t\t\tthrow new CKEditorError( 'editor-create-initial-data', null );\n\t\t\t\t\t\t}\n\n\t\t\t\t\t\tconst initialData = config.initialData || getInitialData( sourceElementOrData );\n\n\t\t\t\t\t\treturn editor.data.init( initialData );\n\t\t\t\t\t} )\n\t\t\t\t\t.then( () => editor.fire( 'ready' ) )\n\t\t\t\t\t.then( () => editor )\n\t\t\t);\n\t\t} );\n\t}\n}\n\nmix( ClassicEditor, DataApiMixin );\nmix( ClassicEditor, ElementApiMixin );\n\nfunction getInitialData( sourceElementOrData ) {\n\treturn isElement( sourceElementOrData ) ? getDataFromElement( sourceElementOrData ) : sourceElementOrData;\n}\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\nimport { isFunction } from 'lodash-es';\nimport CKEditorError from '@ckeditor/ckeditor5-utils/src/ckeditorerror';\n\n/**\n * @module core/editor/utils/attachtoform\n */\n\n/**\n * Checks if the editor is initialized on a `<textarea>` element that belongs to a form. If yes, it updates the editor's element\n * content before submitting the form.\n *\n * This helper requires the {@link module:core/editor/utils/elementapimixin~ElementApi ElementApi interface}.\n *\n * @param {module:core/editor/editor~Editor} editor Editor instance.\n */\nexport default function attachToForm( editor ) {\n\tif ( !isFunction( editor.updateSourceElement ) ) {\n\t\t/**\n\t\t * The editor passed to `attachToForm()` must implement the\n\t\t * {@link module:core/editor/utils/elementapimixin~ElementApi} interface.\n\t\t *\n\t\t * @error attachtoform-missing-elementapi-interface\n\t\t */\n\t\tthrow new CKEditorError(\n\t\t\t'attachtoform-missing-elementapi-interface',\n\t\t\teditor\n\t\t);\n\t}\n\n\tconst sourceElement = editor.sourceElement;\n\n\t// Only when replacing a textarea which is inside of a form element.\n\tif ( sourceElement && sourceElement.tagName.toLowerCase() === 'textarea' && sourceElement.form ) {\n\t\tlet originalSubmit;\n\t\tconst form = sourceElement.form;\n\t\tconst onSubmit = () => editor.updateSourceElement();\n\n\t\t// Replace the original form#submit() to call a custom submit function first.\n\t\t// Check if #submit is a function because the form might have an input named \"submit\".\n\t\tif ( isFunction( form.submit ) ) {\n\t\t\toriginalSubmit = form.submit;\n\n\t\t\tform.submit = () => {\n\t\t\t\tonSubmit();\n\t\t\t\toriginalSubmit.apply( form );\n\t\t\t};\n\t\t}\n\n\t\t// Update the replaced textarea with data before each form#submit event.\n\t\tform.addEventListener( 'submit', onSubmit );\n\n\t\t// Remove the submit listener and revert the original submit method on\n\t\t// editor#destroy.\n\t\teditor.on( 'destroy', () => {\n\t\t\tform.removeEventListener( 'submit', onSubmit );\n\n\t\t\tif ( originalSubmit ) {\n\t\t\t\tform.submit = originalSubmit;\n\t\t\t}\n\t\t} );\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/* globals HTMLTextAreaElement */\n\n/**\n * @module utils/dom/getdatafromelement\n */\n\n/**\n * Gets data from a given source element.\n *\n * @param {HTMLElement} el The element from which the data will be retrieved.\n * @returns {String} The data string.\n */\nexport default function getDataFromElement( el ) {\n\tif ( el instanceof HTMLTextAreaElement ) {\n\t\treturn el.value;\n\t}\n\n\treturn el.innerHTML;\n}\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module core/plugin\n */\n\nimport ObservableMixin from '@ckeditor/ckeditor5-utils/src/observablemixin';\nimport mix from '@ckeditor/ckeditor5-utils/src/mix';\n\n/**\n * The base class for CKEditor plugin classes.\n *\n * @implements module:core/plugin~PluginInterface\n * @mixes module:utils/observablemixin~ObservableMixin\n */\nexport default class Plugin {\n\t/**\n\t * @inheritDoc\n\t */\n\tconstructor( editor ) {\n\t\t/**\n\t\t * The editor instance.\n\t\t *\n\t\t * Note that most editors implement the {@link module:core/editor/editorwithui~EditorWithUI} interface in addition\n\t\t * to the base {@link module:core/editor/editor~Editor} interface. However, editors with an external UI\n\t\t * (i.e. Bootstrap-based) or a headless editor may not implement the {@link module:core/editor/editorwithui~EditorWithUI}\n\t\t * interface.\n\t\t *\n\t\t * Because of above, to make plugins more universal, it is recommended to split features into:\n\t\t *  - The \"editing\" part that only uses the {@link module:core/editor/editor~Editor} interface.\n\t\t *  - The \"UI\" part that uses both the {@link module:core/editor/editor~Editor} interface and\n\t\t *  the {@link module:core/editor/editorwithui~EditorWithUI} interface.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:core/editor/editor~Editor} #editor\n\t\t */\n\t\tthis.editor = editor;\n\n\t\t/**\n\t\t * Flag indicating whether a plugin is enabled or disabled.\n\t\t * A disabled plugin will not transform text.\n\t\t *\n\t\t * Plugin can be simply disabled like that:\n\t\t *\n\t\t *\t\t// Disable the plugin so that no toolbars are visible.\n\t\t *\t\teditor.plugins.get( 'TextTransformation' ).isEnabled = false;\n\t\t *\n\t\t * You can also use {@link #forceDisabled} method.\n\t\t *\n\t\t * @observable\n\t\t * @readonly\n\t\t * @member {Boolean} #isEnabled\n\t\t */\n\t\tthis.set( 'isEnabled', true );\n\n\t\t/**\n\t\t * Holds identifiers for {@link #forceDisabled} mechanism.\n\t\t *\n\t\t * @type {Set.<String>}\n\t\t * @private\n\t\t */\n\t\tthis._disableStack = new Set();\n\t}\n\n\t/**\n\t * Disables the plugin.\n\t *\n\t * Plugin may be disabled by multiple features or algorithms (at once). When disabling a plugin, unique id should be passed\n\t * (e.g. feature name). The same identifier should be used when {@link #clearForceDisabled enabling back} the plugin.\n\t * The plugin becomes enabled only after all features {@link #clearForceDisabled enabled it back}.\n\t *\n\t * Disabling and enabling a plugin:\n\t *\n\t *\t\tplugin.isEnabled; // -> true\n\t *\t\tplugin.forceDisabled( 'MyFeature' );\n\t *\t\tplugin.isEnabled; // -> false\n\t *\t\tplugin.clearForceDisabled( 'MyFeature' );\n\t *\t\tplugin.isEnabled; // -> true\n\t *\n\t * Plugin disabled by multiple features:\n\t *\n\t *\t\tplugin.forceDisabled( 'MyFeature' );\n\t *\t\tplugin.forceDisabled( 'OtherFeature' );\n\t *\t\tplugin.clearForceDisabled( 'MyFeature' );\n\t *\t\tplugin.isEnabled; // -> false\n\t *\t\tplugin.clearForceDisabled( 'OtherFeature' );\n\t *\t\tplugin.isEnabled; // -> true\n\t *\n\t * Multiple disabling with the same identifier is redundant:\n\t *\n\t *\t\tplugin.forceDisabled( 'MyFeature' );\n\t *\t\tplugin.forceDisabled( 'MyFeature' );\n\t *\t\tplugin.clearForceDisabled( 'MyFeature' );\n\t *\t\tplugin.isEnabled; // -> true\n\t *\n\t * **Note:** some plugins or algorithms may have more complex logic when it comes to enabling or disabling certain plugins,\n\t * so the plugin might be still disabled after {@link #clearForceDisabled} was used.\n\t *\n\t * @param {String} id Unique identifier for disabling. Use the same id when {@link #clearForceDisabled enabling back} the plugin.\n\t */\n\tforceDisabled( id ) {\n\t\tthis._disableStack.add( id );\n\n\t\tif ( this._disableStack.size == 1 ) {\n\t\t\tthis.on( 'set:isEnabled', forceDisable, { priority: 'highest' } );\n\t\t\tthis.isEnabled = false;\n\t\t}\n\t}\n\n\t/**\n\t * Clears forced disable previously set through {@link #forceDisabled}. See {@link #forceDisabled}.\n\t *\n\t * @param {String} id Unique identifier, equal to the one passed in {@link #forceDisabled} call.\n\t */\n\tclearForceDisabled( id ) {\n\t\tthis._disableStack.delete( id );\n\n\t\tif ( this._disableStack.size == 0 ) {\n\t\t\tthis.off( 'set:isEnabled', forceDisable );\n\t\t\tthis.isEnabled = true;\n\t\t}\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tdestroy() {\n\t\tthis.stopListening();\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tstatic get isContextPlugin() {\n\t\treturn false;\n\t}\n}\n\nmix( Plugin, ObservableMixin );\n\n/**\n * The base interface for CKEditor plugins.\n *\n * In its minimal form a plugin can be a simple function that accepts {@link module:core/editor/editor~Editor the editor}\n * as a parameter:\n *\n *\t\t// A simple plugin that enables a data processor.\n *\t\tfunction MyPlugin( editor ) {\n *\t\t\teditor.data.processor = new MyDataProcessor();\n *\t\t}\n *\n * In most cases however, you will want to inherit from the {@link module:core/plugin~Plugin} class which implements the\n * {@link module:utils/observablemixin~ObservableMixin} and is, therefore, more convenient:\n *\n *\t\tclass MyPlugin extends Plugin {\n *\t\t\tinit() {\n *\t\t\t\t// `listenTo()` and `editor` are available thanks to `Plugin`.\n *\t\t\t\t// By using `listenTo()` you will ensure that the listener is removed when\n *\t\t\t\t// the plugin is destroyed.\n *\t\t\t\tthis.listenTo( this.editor.data, 'ready', () => {\n *\t\t\t\t\t// Do something when the data is ready.\n *\t\t\t\t} );\n *\t\t\t}\n *\t\t}\n *\n * The plugin can also implement methods (e.g. {@link module:core/plugin~PluginInterface#init `init()`} or\n * {@link module:core/plugin~PluginInterface#destroy `destroy()`}) which, when present, will be used to properly\n * initialize and destroy the plugin.\n *\n * **Note:** When defined as a plain function, the plugin acts as a constructor and will be\n * called in parallel with other plugins' {@link module:core/plugin~PluginInterface#constructor constructors}.\n * This means the code of that plugin will be executed **before** {@link module:core/plugin~PluginInterface#init `init()`} and\n * {@link module:core/plugin~PluginInterface#afterInit `afterInit()`} methods of other plugins and, for instance,\n * you cannot use it to extend other plugins' {@glink framework/guides/architecture/editing-engine#schema schema}\n * rules as they are defined later on during the `init()` stage.\n *\n * @interface PluginInterface\n */\n\n/**\n * Creates a new plugin instance. This is the first step of the plugin initialization.\n * See also {@link #init} and {@link #afterInit}.\n *\n * A plugin is always instantiated after its {@link module:core/plugin~PluginInterface.requires dependencies} and the\n * {@link #init} and {@link #afterInit} methods are called in the same order.\n *\n * Usually, you will want to put your plugin's initialization code in the {@link #init} method.\n * The constructor can be understood as \"before init\" and used in special cases, just like\n * {@link #afterInit} serves the special \"after init\" scenarios (e.g.the code which depends on other\n * plugins, but which does not {@link module:core/plugin~PluginInterface.requires explicitly require} them).\n *\n * @method #constructor\n * @param {module:core/editor/editor~Editor} editor\n */\n\n/**\n * An array of plugins required by this plugin.\n *\n * To keep the plugin class definition tight it is recommended to define this property as a static getter:\n *\n *\t\timport Image from './image.js';\n *\n *\t\texport default class ImageCaption {\n *\t\t\tstatic get requires() {\n *\t\t\t\treturn [ Image ];\n *\t\t\t}\n *\t\t}\n *\n * @static\n * @readonly\n * @member {Array.<Function>|undefined} module:core/plugin~PluginInterface.requires\n */\n\n/**\n * An optional name of the plugin. If set, the plugin will be available in\n * {@link module:core/plugincollection~PluginCollection#get} by its\n * name and its constructor. If not, then only by its constructor.\n *\n * The name should reflect the constructor name.\n *\n * To keep the plugin class definition tight, it is recommended to define this property as a static getter:\n *\n *\t\texport default class ImageCaption {\n *\t\t\tstatic get pluginName() {\n *\t\t\t\treturn 'ImageCaption';\n *\t\t\t}\n *\t\t}\n *\n * Note: The native `Function.name` property could not be used to keep the plugin name because\n * it will be mangled during code minification.\n *\n * Naming a plugin is necessary to enable removing it through the\n * {@link module:core/editor/editorconfig~EditorConfig#removePlugins `config.removePlugins`} option.\n *\n * @static\n * @readonly\n * @member {String|undefined} module:core/plugin~PluginInterface.pluginName\n */\n\n/**\n * The second stage (after plugin {@link #constructor}) of the plugin initialization.\n * Unlike the plugin constructor this method can be asynchronous.\n *\n * A plugin's `init()` method is called after its {@link module:core/plugin~PluginInterface.requires dependencies} are initialized,\n * so in the same order as the constructors of these plugins.\n *\n * **Note:** This method is optional. A plugin instance does not need to have it defined.\n *\n * @method #init\n * @returns {null|Promise}\n */\n\n/**\n * The third (and last) stage of the plugin initialization. See also {@link #constructor} and {@link #init}.\n *\n * **Note:** This method is optional. A plugin instance does not need to have it defined.\n *\n * @method #afterInit\n * @returns {null|Promise}\n */\n\n/**\n * Destroys the plugin.\n *\n * **Note:** This method is optional. A plugin instance does not need to have it defined.\n *\n * @method #destroy\n * @returns {null|Promise}\n */\n\n/**\n * A flag which defines if a plugin is allowed or not allowed to be used directly by a {@link module:core/context~Context}.\n *\n * @static\n * @readonly\n * @member {Boolean} module:core/plugin~PluginInterface.isContextPlugin\n */\n\n/**\n * An array of loaded plugins.\n *\n * @typedef {Array.<module:core/plugin~PluginInterface>} module:core/plugin~LoadedPlugins\n */\n\n// Helper function that forces plugin to be disabled.\nfunction forceDisable( evt ) {\n\tevt.return = false;\n\tevt.stop();\n}\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module clipboard/datatransfer\n */\n\n/**\n * Facade over the native [`DataTransfer`](https://developer.mozilla.org/en-US/docs/Web/API/DataTransfer) object.\n */\nexport default class DataTransfer {\n\tconstructor( nativeDataTransfer ) {\n\t\t/**\n\t\t * The array of files created from the native `DataTransfer#files` or `DataTransfer#items`.\n\t\t *\n\t\t * @readonly\n\t\t * @member {Array.<File>} #files\n\t\t */\n\t\tthis.files = getFiles( nativeDataTransfer );\n\n\t\t/**\n\t\t * The native DataTransfer object.\n\t\t *\n\t\t * @private\n\t\t * @member {DataTransfer} #_native\n\t\t */\n\t\tthis._native = nativeDataTransfer;\n\t}\n\n\t/**\n\t * Returns an array of available native content types.\n\t *\n\t * @returns {Array.<String>}\n\t */\n\tget types() {\n\t\treturn this._native.types;\n\t}\n\n\t/**\n\t * Gets data from the data transfer by its mime type.\n\t *\n\t *\t\tdataTransfer.getData( 'text/plain' );\n\t *\n\t * @param {String} type The mime type. E.g. `text/html` or `text/plain`.\n\t * @returns {String}\n\t */\n\tgetData( type ) {\n\t\treturn this._native.getData( type );\n\t}\n\n\t/**\n\t * Sets data in the data transfer.\n\t *\n\t * @param {String} type The mime type. E.g. `text/html` or `text/plain`.\n\t * @param {String} data\n\t */\n\tsetData( type, data ) {\n\t\tthis._native.setData( type, data );\n\t}\n}\n\nfunction getFiles( nativeDataTransfer ) {\n\t// DataTransfer.files and items are Array-like and might not have an iterable interface.\n\tconst files = nativeDataTransfer.files ? Array.from( nativeDataTransfer.files ) : [];\n\tconst items = nativeDataTransfer.items ? Array.from( nativeDataTransfer.items ) : [];\n\n\tif ( files.length ) {\n\t\treturn files;\n\t}\n\t// Chrome have empty DataTransfer.files, but let get files through the items interface.\n\treturn items\n\t\t.filter( item => item.kind === 'file' )\n\t\t.map( item => item.getAsFile() );\n}\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module clipboard/clipboardobserver\n */\n\nimport DomEventObserver from '@ckeditor/ckeditor5-engine/src/view/observer/domeventobserver';\nimport EventInfo from '@ckeditor/ckeditor5-utils/src/eventinfo';\nimport DataTransfer from './datatransfer';\n\n/**\n * Clipboard events observer.\n *\n * Fires the following events:\n *\n * * {@link module:engine/view/document~Document#event:clipboardInput}\n * * {@link module:engine/view/document~Document#event:dragover}\n * * {@link module:engine/view/document~Document#event:drop}\n * * {@link module:engine/view/document~Document#event:paste}\n * * {@link module:engine/view/document~Document#event:copy}\n * * {@link module:engine/view/document~Document#event:cut}\n *\n * Note that this observer is not available by default (it is not added by the engine).\n * To make it available, it needs to be added to {@link module:engine/view/document~Document} by\n * the {@link module:engine/view/view~View#addObserver `View#addObserver()`} method. You can also load the\n * {@link module:clipboard/clipboard~Clipboard} plugin which adds this observer automatically (because it uses it).\n *\n * @extends module:engine/view/observer/domeventobserver~DomEventObserver\n */\nexport default class ClipboardObserver extends DomEventObserver {\n\tconstructor( view ) {\n\t\tsuper( view );\n\n\t\tconst viewDocument = this.document;\n\n\t\tthis.domEventType = [ 'paste', 'copy', 'cut', 'drop', 'dragover' ];\n\n\t\tthis.listenTo( viewDocument, 'paste', handleInput, { priority: 'low' } );\n\t\tthis.listenTo( viewDocument, 'drop', handleInput, { priority: 'low' } );\n\n\t\tfunction handleInput( evt, data ) {\n\t\t\tdata.preventDefault();\n\n\t\t\tconst targetRanges = data.dropRange ? [ data.dropRange ] : Array.from( viewDocument.selection.getRanges() );\n\n\t\t\tconst eventInfo = new EventInfo( viewDocument, 'clipboardInput' );\n\n\t\t\tviewDocument.fire( eventInfo, {\n\t\t\t\tdataTransfer: data.dataTransfer,\n\t\t\t\ttargetRanges\n\t\t\t} );\n\n\t\t\t// If CKEditor handled the input, do not bubble the original event any further.\n\t\t\t// This helps external integrations recognize that fact and act accordingly.\n\t\t\t// https://github.com/ckeditor/ckeditor5-upload/issues/92\n\t\t\tif ( eventInfo.stop.called ) {\n\t\t\t\tdata.stopPropagation();\n\t\t\t}\n\t\t}\n\t}\n\n\tonDomEvent( domEvent ) {\n\t\tconst evtData = {\n\t\t\tdataTransfer: new DataTransfer( domEvent.clipboardData ? domEvent.clipboardData : domEvent.dataTransfer )\n\t\t};\n\n\t\tif ( domEvent.type == 'drop' ) {\n\t\t\tevtData.dropRange = getDropViewRange( this.view, domEvent );\n\t\t}\n\n\t\tthis.fire( domEvent.type, domEvent, evtData );\n\t}\n}\n\nfunction getDropViewRange( view, domEvent ) {\n\tconst domDoc = domEvent.target.ownerDocument;\n\tconst x = domEvent.clientX;\n\tconst y = domEvent.clientY;\n\tlet domRange;\n\n\t// Webkit & Blink.\n\tif ( domDoc.caretRangeFromPoint && domDoc.caretRangeFromPoint( x, y ) ) {\n\t\tdomRange = domDoc.caretRangeFromPoint( x, y );\n\t}\n\t// FF.\n\telse if ( domEvent.rangeParent ) {\n\t\tdomRange = domDoc.createRange();\n\t\tdomRange.setStart( domEvent.rangeParent, domEvent.rangeOffset );\n\t\tdomRange.collapse( true );\n\t}\n\n\tif ( domRange ) {\n\t\treturn view.domConverter.domRangeToView( domRange );\n\t} else {\n\t\treturn view.document.selection.getFirstRange();\n\t}\n}\n\n/**\n * Fired as a continuation of the {@link #event:paste} and {@link #event:drop} events.\n *\n * It is a part of the {@glink framework/guides/deep-dive/clipboard#input-pipeline \"clipboard input pipeline\"}.\n *\n * Fired with a `dataTransfer` which comes from the clipboard and whose content should be processed\n * and inserted into the editor.\n *\n * Note that this event is not available by default. To make it available, {@link module:clipboard/clipboardobserver~ClipboardObserver}\n * needs to be added to the {@link module:engine/view/document~Document} by the {@link module:engine/view/view~View#addObserver} method.\n * This is done by the {@link module:clipboard/clipboard~Clipboard} feature. If it is not loaded, it must be done manually.\n *\n * @see module:clipboard/clipboardobserver~ClipboardObserver\n * @see module:clipboard/clipboard~Clipboard\n * @event module:engine/view/document~Document#event:clipboardInput\n * @param {Object} data Event data.\n * @param {module:clipboard/datatransfer~DataTransfer} data.dataTransfer The data transfer instance.\n * @param {Array.<module:engine/view/range~Range>} data.targetRanges Ranges which are the target of the operation\n * (usually – into which the content should be inserted).\n * If clipboard input was triggered by a paste operation, then these are the selection ranges. If by a drop operation,\n * then it is the drop position (which can be different than the selection at the moment of drop).\n */\n\n/**\n * Fired when the user drags the content over one of the editables.\n *\n * Introduced by {@link module:clipboard/clipboardobserver~ClipboardObserver}.\n *\n * Note that this event is not available by default. To make it available, {@link module:clipboard/clipboardobserver~ClipboardObserver}\n * needs to be added to the {@link module:engine/view/document~Document} by the {@link module:engine/view/view~View#addObserver} method.\n * This is done by the {@link module:clipboard/clipboard~Clipboard} feature. If it is not loaded, it must be done manually.\n *\n * @see module:engine/view/document~Document#event:clipboardInput\n * @event module:engine/view/document~Document#event:dragover\n * @param {module:clipboard/clipboardobserver~ClipboardEventData} data The event data.\n */\n\n/**\n * Fired when the user dropped the content into one of the editables.\n *\n * Introduced by {@link module:clipboard/clipboardobserver~ClipboardObserver}.\n *\n * Note that this event is not available by default. To make it available, {@link module:clipboard/clipboardobserver~ClipboardObserver}\n * needs to be added to the {@link module:engine/view/document~Document} by the {@link module:engine/view/view~View#addObserver} method.\n * This is done by the {@link module:clipboard/clipboard~Clipboard} feature. If it is not loaded, it must be done manually.\n *\n * @see module:engine/view/document~Document#event:clipboardInput\n * @event module:engine/view/document~Document#event:drop\n * @param {module:clipboard/clipboardobserver~ClipboardEventData} data The event data.\n * @param {module:engine/view/range~Range} dropRange The position into which the content is dropped.\n */\n\n/**\n * Fired when the user pasted the content into one of the editables.\n *\n * Introduced by {@link module:clipboard/clipboardobserver~ClipboardObserver}.\n *\n * Note that this event is not available by default. To make it available, {@link module:clipboard/clipboardobserver~ClipboardObserver}\n * needs to be added to the {@link module:engine/view/document~Document} by the {@link module:engine/view/view~View#addObserver} method.\n * This is done by the {@link module:clipboard/clipboard~Clipboard} feature. If it is not loaded, it must be done manually.\n *\n * @see module:engine/view/document~Document#event:clipboardInput\n * @event module:engine/view/document~Document#event:paste\n * @param {module:clipboard/clipboardobserver~ClipboardEventData} data The event data.\n */\n\n/**\n * Fired when the user copied the content from one of the editables.\n *\n * Introduced by {@link module:clipboard/clipboardobserver~ClipboardObserver}.\n *\n * Note that this event is not available by default. To make it available, {@link module:clipboard/clipboardobserver~ClipboardObserver}\n * needs to be added to the {@link module:engine/view/document~Document} by the {@link module:engine/view/view~View#addObserver} method.\n * This is done by the {@link module:clipboard/clipboard~Clipboard} feature. If it is not loaded, it must be done manually.\n *\n * @see module:clipboard/clipboardobserver~ClipboardObserver\n * @event module:engine/view/document~Document#event:copy\n * @param {module:clipboard/clipboardobserver~ClipboardEventData} data The event data.\n */\n\n/**\n * Fired when the user cut the content from one of the editables.\n *\n * Introduced by {@link module:clipboard/clipboardobserver~ClipboardObserver}.\n *\n * Note that this event is not available by default. To make it available, {@link module:clipboard/clipboardobserver~ClipboardObserver}\n * needs to be added to the {@link module:engine/view/document~Document} by the {@link module:engine/view/view~View#addObserver} method.\n * This is done by the {@link module:clipboard/clipboard~Clipboard} feature. If it is not loaded, it must be done manually.\n *\n * @see module:clipboard/clipboardobserver~ClipboardObserver\n * @event module:engine/view/document~Document#event:cut\n * @param {module:clipboard/clipboardobserver~ClipboardEventData} data The event data.\n */\n\n/**\n * The value of the {@link module:engine/view/document~Document#event:paste},\n * {@link module:engine/view/document~Document#event:copy} and {@link module:engine/view/document~Document#event:cut} events.\n *\n * In order to access the clipboard data, use the `dataTransfer` property.\n *\n * @class module:clipboard/clipboardobserver~ClipboardEventData\n * @extends module:engine/view/observer/domeventdata~DomEventData\n */\n\n/**\n * The data transfer instance.\n *\n * @readonly\n * @member {module:clipboard/datatransfer~DataTransfer} module:clipboard/clipboardobserver~ClipboardEventData#dataTransfer\n */\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module clipboard/clipboard\n */\n\nimport Plugin from '@ckeditor/ckeditor5-core/src/plugin';\n\nimport ClipboardObserver from './clipboardobserver';\n\n/**\n * The plugin detects user intentions for pasting plain text.\n *\n * For example, it detects <kbd>Ctrl/Cmd</kbd> + <kbd>Shift</kbd> + <kbd>V</kbd> keystroke.\n *\n * @extends module:core/plugin~Plugin\n */\nexport default class PastePlainText extends Plugin {\n\t/**\n\t * @inheritDoc\n\t */\n\tstatic get pluginName() {\n\t\treturn 'PastePlainText';\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tinit() {\n\t\tconst view = this.editor.editing.view;\n\t\tconst viewDocument = view.document;\n\t\tlet shiftPressed = false;\n\n\t\tview.addObserver( ClipboardObserver );\n\n\t\tthis.listenTo( viewDocument, 'keydown', ( evt, data ) => {\n\t\t\tshiftPressed = data.shiftKey;\n\t\t} );\n\n\t\tthis.listenTo( viewDocument, 'clipboardInput', ( evt, data ) => {\n\t\t\tif ( shiftPressed ) {\n\t\t\t\tdata.asPlainText = true;\n\t\t\t}\n\t\t}, { priority: 'high' } );\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module clipboard/utils/viewtoplaintext\n */\n\n// Elements which should not have empty-line padding.\n// Most `view.ContainerElement` want to be separate by new-line, but some are creating one structure\n// together (like `<li>`) so it is better to separate them by only one \"\\n\".\nconst smallPaddingElements = [ 'figcaption', 'li' ];\n\n/**\n * Converts {@link module:engine/view/item~Item view item} and all of its children to plain text.\n *\n * @param {module:engine/view/item~Item} viewItem View item to convert.\n * @returns {String} Plain text representation of `viewItem`.\n */\nexport default function viewToPlainText( viewItem ) {\n\tlet text = '';\n\n\tif ( viewItem.is( '$text' ) || viewItem.is( '$textProxy' ) ) {\n\t\t// If item is `Text` or `TextProxy` simple take its text data.\n\t\ttext = viewItem.data;\n\t} else if ( viewItem.is( 'element', 'img' ) && viewItem.hasAttribute( 'alt' ) ) {\n\t\t// Special case for images - use alt attribute if it is provided.\n\t\ttext = viewItem.getAttribute( 'alt' );\n\t} else if ( viewItem.is( 'element', 'br' ) ) {\n\t\t// A soft break should be converted into a single line break (#8045).\n\t\ttext = '\\n';\n\t} else {\n\t\t// Other elements are document fragments, attribute elements or container elements.\n\t\t// They don't have their own text value, so convert their children.\n\t\tlet prev = null;\n\n\t\tfor ( const child of viewItem.getChildren() ) {\n\t\t\tconst childText = viewToPlainText( child );\n\n\t\t\t// Separate container element children with one or more new-line characters.\n\t\t\tif ( prev && ( prev.is( 'containerElement' ) || child.is( 'containerElement' ) ) ) {\n\t\t\t\tif ( smallPaddingElements.includes( prev.name ) || smallPaddingElements.includes( child.name ) ) {\n\t\t\t\t\ttext += '\\n';\n\t\t\t\t} else {\n\t\t\t\t\ttext += '\\n\\n';\n\t\t\t\t}\n\t\t\t}\n\n\t\t\ttext += childText;\n\t\t\tprev = child;\n\t\t}\n\t}\n\n\treturn text;\n}\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module clipboard/clipboard\n */\n\nimport Plugin from '@ckeditor/ckeditor5-core/src/plugin';\nimport PastePlainText from './pasteplaintext';\n\nimport ClipboardObserver from './clipboardobserver';\n\nimport plainTextToHtml from './utils/plaintexttohtml';\nimport normalizeClipboardHtml from './utils/normalizeclipboarddata';\nimport viewToPlainText from './utils/viewtoplaintext.js';\n\nimport HtmlDataProcessor from '@ckeditor/ckeditor5-engine/src/dataprocessor/htmldataprocessor';\nimport EventInfo from '@ckeditor/ckeditor5-utils/src/eventinfo';\n\n/**\n * The clipboard feature. It is responsible for intercepting the `paste` and `drop` events and\n * passing the pasted content through the clipboard pipeline in order to insert it into the editor's content.\n * It also handles the `cut` and `copy` events to fill the native clipboard with serialized editor's data.\n *\n * Read more about the clipboard integration in {@glink framework/guides/deep-dive/clipboard \"Clipboard\" deep dive} guide.\n *\n * @extends module:core/plugin~Plugin\n */\nexport default class Clipboard extends Plugin {\n\t/**\n\t * @inheritDoc\n\t */\n\tstatic get pluginName() {\n\t\treturn 'Clipboard';\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tstatic get requires() {\n\t\treturn [ PastePlainText ];\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tinit() {\n\t\tconst editor = this.editor;\n\t\tconst modelDocument = editor.model.document;\n\t\tconst view = editor.editing.view;\n\t\tconst viewDocument = view.document;\n\n\t\t/**\n\t\t * Data processor used to convert pasted HTML to a view structure.\n\t\t *\n\t\t * @private\n\t\t * @member {module:engine/dataprocessor/htmldataprocessor~HtmlDataProcessor} #_htmlDataProcessor\n\t\t */\n\t\tthis._htmlDataProcessor = new HtmlDataProcessor( viewDocument );\n\n\t\tview.addObserver( ClipboardObserver );\n\n\t\t// The clipboard paste pipeline.\n\n\t\t// Pasting and dropping is disabled when editor is read-only.\n\t\t// See: https://github.com/ckeditor/ckeditor5-clipboard/issues/26.\n\t\tthis.listenTo( viewDocument, 'clipboardInput', evt => {\n\t\t\tif ( editor.isReadOnly ) {\n\t\t\t\tevt.stop();\n\t\t\t}\n\t\t}, { priority: 'highest' } );\n\n\t\tthis.listenTo( viewDocument, 'clipboardInput', ( evt, data ) => {\n\t\t\tconst dataTransfer = data.dataTransfer;\n\t\t\tlet content = '';\n\n\t\t\tif ( dataTransfer.getData( 'text/html' ) ) {\n\t\t\t\tcontent = normalizeClipboardHtml( dataTransfer.getData( 'text/html' ) );\n\t\t\t} else if ( dataTransfer.getData( 'text/plain' ) ) {\n\t\t\t\tcontent = plainTextToHtml( dataTransfer.getData( 'text/plain' ) );\n\t\t\t}\n\n\t\t\tcontent = this._htmlDataProcessor.toView( content );\n\n\t\t\tconst eventInfo = new EventInfo( this, 'inputTransformation' );\n\t\t\tthis.fire( eventInfo, {\n\t\t\t\tcontent,\n\t\t\t\tdataTransfer,\n\t\t\t\tasPlainText: data.asPlainText\n\t\t\t} );\n\n\t\t\t// If CKEditor handled the input, do not bubble the original event any further.\n\t\t\t// This helps external integrations recognize that fact and act accordingly.\n\t\t\t// https://github.com/ckeditor/ckeditor5-upload/issues/92\n\t\t\tif ( eventInfo.stop.called ) {\n\t\t\t\tevt.stop();\n\t\t\t}\n\n\t\t\tview.scrollToTheSelection();\n\t\t}, { priority: 'low' } );\n\n\t\tthis.listenTo( this, 'inputTransformation', ( evt, data ) => {\n\t\t\tif ( !data.content.isEmpty ) {\n\t\t\t\tconst dataController = this.editor.data;\n\t\t\t\tconst model = this.editor.model;\n\n\t\t\t\t// Convert the pasted content to a model document fragment.\n\t\t\t\t// Conversion is contextual, but in this case we need an \"all allowed\" context and for that\n\t\t\t\t// we use the $clipboardHolder item.\n\t\t\t\tconst modelFragment = dataController.toModel( data.content, '$clipboardHolder' );\n\n\t\t\t\tif ( modelFragment.childCount == 0 ) {\n\t\t\t\t\treturn;\n\t\t\t\t}\n\n\t\t\t\tmodel.change( writer => {\n\t\t\t\t\tconst selection = model.document.selection;\n\n\t\t\t\t\t// Plain text can be determined based on event flag (#7799) or auto detection (#1006). If detected\n\t\t\t\t\t// preserve selection attributes on pasted items.\n\t\t\t\t\tif ( data.asPlainText || isPlainTextFragment( modelFragment, model.schema ) ) {\n\t\t\t\t\t\t// Formatting attributes should be preserved.\n\t\t\t\t\t\tconst textAttributes = Array.from( selection.getAttributes() )\n\t\t\t\t\t\t\t.filter( ( [ key ] ) => model.schema.getAttributeProperties( key ).isFormatting );\n\n\t\t\t\t\t\tif ( !selection.isCollapsed ) {\n\t\t\t\t\t\t\tmodel.deleteContent( selection, { doNotAutoparagraph: true } );\n\t\t\t\t\t\t}\n\n\t\t\t\t\t\t// But also preserve other attributes if they survived the content deletion (because they were not fully selected).\n\t\t\t\t\t\t// For example linkHref is not a formatting attribute but it should be preserved if pasted text was in the middle\n\t\t\t\t\t\t// of a link.\n\t\t\t\t\t\ttextAttributes.push( ...selection.getAttributes() );\n\n\t\t\t\t\t\tconst range = writer.createRangeIn( modelFragment );\n\n\t\t\t\t\t\tfor ( const item of range.getItems() ) {\n\t\t\t\t\t\t\tif ( item.is( '$text' ) || item.is( '$textProxy' ) ) {\n\t\t\t\t\t\t\t\twriter.setAttributes( textAttributes, item );\n\t\t\t\t\t\t\t}\n\t\t\t\t\t\t}\n\t\t\t\t\t}\n\n\t\t\t\t\tmodel.insertContent( modelFragment );\n\t\t\t\t} );\n\n\t\t\t\tevt.stop();\n\t\t\t}\n\t\t}, { priority: 'low' } );\n\n\t\t// The clipboard copy/cut pipeline.\n\n\t\tfunction onCopyCut( evt, data ) {\n\t\t\tconst dataTransfer = data.dataTransfer;\n\n\t\t\tdata.preventDefault();\n\n\t\t\tconst content = editor.data.toView( editor.model.getSelectedContent( modelDocument.selection ) );\n\n\t\t\tviewDocument.fire( 'clipboardOutput', { dataTransfer, content, method: evt.name } );\n\t\t}\n\n\t\tthis.listenTo( viewDocument, 'copy', onCopyCut, { priority: 'low' } );\n\t\tthis.listenTo( viewDocument, 'cut', ( evt, data ) => {\n\t\t\t// Cutting is disabled when editor is read-only.\n\t\t\t// See: https://github.com/ckeditor/ckeditor5-clipboard/issues/26.\n\t\t\tif ( editor.isReadOnly ) {\n\t\t\t\tdata.preventDefault();\n\t\t\t} else {\n\t\t\t\tonCopyCut( evt, data );\n\t\t\t}\n\t\t}, { priority: 'low' } );\n\n\t\tthis.listenTo( viewDocument, 'clipboardOutput', ( evt, data ) => {\n\t\t\tif ( !data.content.isEmpty ) {\n\t\t\t\tdata.dataTransfer.setData( 'text/html', this._htmlDataProcessor.toData( data.content ) );\n\t\t\t\tdata.dataTransfer.setData( 'text/plain', viewToPlainText( data.content ) );\n\t\t\t}\n\n\t\t\tif ( data.method == 'cut' ) {\n\t\t\t\teditor.model.deleteContent( modelDocument.selection );\n\t\t\t}\n\t\t}, { priority: 'low' } );\n\t}\n}\n\n/**\n * Fired with a `content` and `dataTransfer` objects. The `content` which comes from the clipboard (was pasted or dropped)\n * should be processed in order to be inserted into the editor. The `dataTransfer` object is available\n * in case the transformation functions needs access to a raw clipboard data.\n *\n * It is a part of the {@glink framework/guides/deep-dive/clipboard#input-pipeline \"clipboard input pipeline\"}.\n *\n * @see module:clipboard/clipboardobserver~ClipboardObserver\n * @see module:clipboard/clipboard~Clipboard\n * @event module:clipboard/clipboard~Clipboard#event:inputTransformation\n * @param {Object} data Event data.\n * @param {module:engine/view/documentfragment~DocumentFragment} data.content Event data. Content to be inserted into the editor.\n * It can be modified by the event listeners. Read more about the clipboard pipelines in\n * {@glink framework/guides/deep-dive/clipboard \"Clipboard\" deep dive}.\n * @param {module:clipboard/datatransfer~DataTransfer} data.dataTransfer Data transfer instance.\n * @param {Boolean} data.asPlainText If set to `true` content is pasted as plain text.\n */\n\n/**\n * Fired on {@link module:engine/view/document~Document#event:copy} and {@link module:engine/view/document~Document#event:cut}\n * with a copy of selected content. The content can be processed before it ends up in the clipboard.\n *\n * It is a part of the {@glink framework/guides/deep-dive/clipboard#output-pipeline \"clipboard output pipeline\"}.\n *\n * @see module:clipboard/clipboardobserver~ClipboardObserver\n * @see module:clipboard/clipboard~Clipboard\n * @event module:engine/view/document~Document#event:clipboardOutput\n * @param {module:clipboard/clipboard~ClipboardOutputEventData} data Event data.\n */\n\n/**\n * The value of the {@link module:engine/view/document~Document#event:clipboardOutput} event.\n *\n * @class module:clipboard/clipboard~ClipboardOutputEventData\n */\n\n/**\n * Data transfer instance.\n *\n * @readonly\n * @member {module:clipboard/datatransfer~DataTransfer} module:clipboard/clipboard~ClipboardOutputEventData#dataTransfer\n */\n\n/**\n * Content to be put into the clipboard. It can be modified by the event listeners.\n * Read more about the clipboard pipelines in {@glink framework/guides/deep-dive/clipboard \"Clipboard\" deep dive}.\n *\n * @member {module:engine/view/documentfragment~DocumentFragment} module:clipboard/clipboard~ClipboardOutputEventData#content\n */\n\n/**\n * Whether the event was triggered by copy or cut operation.\n *\n * @member {'copy'|'cut'} module:clipboard/clipboard~ClipboardOutputEventData#method\n */\n\n// Returns true if specified `documentFragment` represents a plain text.\n//\n// @param {module:engine/view/documentfragment~DocumentFragment} documentFragment\n// @param {module:engine/model/schema~Schema} schema\n// @returns {Boolean}\nfunction isPlainTextFragment( documentFragment, schema ) {\n\tif ( documentFragment.childCount > 1 ) {\n\t\treturn false;\n\t}\n\n\tconst child = documentFragment.getChild( 0 );\n\n\tif ( schema.isObject( child ) ) {\n\t\treturn false;\n\t}\n\n\treturn [ ...child.getAttributeKeys() ].length == 0;\n}\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module clipboard/utils/plaintexttohtml\n */\n\n/**\n * Converts plain text to its HTML-ized version.\n *\n * @param {String} text The plain text to convert.\n * @returns {String} HTML generated from the plain text.\n */\nexport default function plainTextToHtml( text ) {\n\ttext = text\n\t\t// Encode <>.\n\t\t.replace( /</g, '&lt;' )\n\t\t.replace( />/g, '&gt;' )\n\t\t// Creates a paragraph for each double line break.\n\t\t.replace( /\\r?\\n\\r?\\n/g, '</p><p>' )\n\t\t// Creates a line break for each single line break.\n\t\t.replace( /\\r?\\n/g, '<br>' )\n\t\t// Preserve trailing spaces (only the first and last one – the rest is handled below).\n\t\t.replace( /^\\s/, '&nbsp;' )\n\t\t.replace( /\\s$/, '&nbsp;' )\n\t\t// Preserve other subsequent spaces now.\n\t\t.replace( /\\s\\s/g, ' &nbsp;' );\n\n\tif ( text.includes( '</p><p>' ) || text.includes( '<br>' ) ) {\n\t\t// If we created paragraphs above, add the trailing ones.\n\t\ttext = `<p>${ text }</p>`;\n\t}\n\n\t// TODO:\n\t// * What about '\\nfoo' vs ' foo'?\n\n\treturn text;\n}\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module clipboard/utils/normalizeclipboarddata\n */\n\n/**\n * Removes some popular browser quirks out of the clipboard data (HTML).\n *\n * @param {String} data The HTML data to normalize.\n * @returns {String} Normalized HTML.\n */\nexport default function normalizeClipboardData( data ) {\n\treturn data\n\t\t.replace( /<span(?: class=\"Apple-converted-space\"|)>(\\s+)<\\/span>/g, ( fullMatch, spaces ) => {\n\t\t\t// Handle the most popular and problematic case when even a single space becomes an nbsp;.\n\t\t\t// Decode those to normal spaces. Read more in https://github.com/ckeditor/ckeditor5-clipboard/issues/2.\n\t\t\tif ( spaces.length == 1 ) {\n\t\t\t\treturn ' ';\n\t\t\t}\n\n\t\t\treturn spaces;\n\t\t} );\n}\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module core/command\n */\n\nimport ObservableMixin from '@ckeditor/ckeditor5-utils/src/observablemixin';\nimport mix from '@ckeditor/ckeditor5-utils/src/mix';\n\n/**\n * The base class for CKEditor commands.\n *\n * Commands are the main way to manipulate editor contents and state. They are mostly used by UI elements (or by other\n * commands) to make changes in the model. Commands are available in every part of code that has access to\n * the {@link module:core/editor/editor~Editor editor} instance.\n *\n * Instances of registered commands can be retrieved from {@link module:core/editor/editor~Editor#commands `editor.commands`}.\n * The easiest way to execute a command is through {@link module:core/editor/editor~Editor#execute `editor.execute()`}.\n *\n * By default commands are disabled when the editor is in {@link module:core/editor/editor~Editor#isReadOnly read-only} mode.\n *\n * @mixes module:utils/observablemixin~ObservableMixin\n */\nexport default class Command {\n\t/**\n\t * Creates a new `Command` instance.\n\t *\n\t * @param {module:core/editor/editor~Editor} editor Editor on which this command will be used.\n\t */\n\tconstructor( editor ) {\n\t\t/**\n\t\t * The editor on which this command will be used.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:core/editor/editor~Editor}\n\t\t */\n\t\tthis.editor = editor;\n\n\t\t/**\n\t\t * The value of the command. A concrete command class should define what it represents for it.\n\t\t *\n\t\t * For example, the `'bold'` command's value indicates whether the selection starts in a bolded text.\n\t\t * And the value of the `'link'` command may be an object with links details.\n\t\t *\n\t\t * It is possible for a command to have no value (e.g. for stateless actions such as `'imageUpload'`).\n\t\t *\n\t\t * A concrete command class should control this value by overriding the {@link #refresh `refresh()`} method.\n\t\t *\n\t\t * @observable\n\t\t * @readonly\n\t\t * @member #value\n\t\t */\n\t\tthis.set( 'value', undefined );\n\n\t\t/**\n\t\t * Flag indicating whether a command is enabled or disabled.\n\t\t * A disabled command will do nothing when executed.\n\t\t *\n\t\t * A concrete command class should control this value by overriding the {@link #refresh `refresh()`} method.\n\t\t *\n\t\t * It is possible to disable a command from \"outside\". For instance, in your integration you may want to disable\n\t\t * a certain set of commands for the time being. To do that, you can use the fact that `isEnabled` is observable\n\t\t * and it fires the `set:isEnabled` event every time anyone tries to modify its value:\n\t\t *\n\t\t *\t\tfunction disableCommand( cmd ) {\n\t\t *\t\t\tcmd.on( 'set:isEnabled', forceDisable, { priority: 'highest' } );\n\t\t *\n\t\t *\t\t\tcmd.isEnabled = false;\n\t\t *\n\t\t *\t\t\t// Make it possible to enable the command again.\n\t\t *\t\t\treturn () => {\n\t\t *\t\t\t\tcmd.off( 'set:isEnabled', forceDisable );\n\t\t *\t\t\t\tcmd.refresh();\n\t\t *\t\t\t};\n\t\t *\n\t\t *\t\t\tfunction forceDisable( evt ) {\n\t\t *\t\t\t\tevt.return = false;\n\t\t *\t\t\t\tevt.stop();\n\t\t *\t\t\t}\n\t\t *\t\t}\n\t\t *\n\t\t *\t\t// Usage:\n\t\t *\n\t\t *\t\t// Disabling the command.\n\t\t *\t\tconst enableBold = disableCommand( editor.commands.get( 'bold' ) );\n\t\t *\n\t\t *\t\t// Enabling the command again.\n\t\t *\t\tenableBold();\n\t\t *\n\t\t * @observable\n\t\t * @readonly\n\t\t * @member {Boolean} #isEnabled\n\t\t */\n\t\tthis.set( 'isEnabled', false );\n\n\t\t/**\n\t\t * Holds identifiers for {@link #forceDisabled} mechanism.\n\t\t *\n\t\t * @type {Set.<String>}\n\t\t * @private\n\t\t */\n\t\tthis._disableStack = new Set();\n\n\t\tthis.decorate( 'execute' );\n\n\t\t// By default every command is refreshed when changes are applied to the model.\n\t\tthis.listenTo( this.editor.model.document, 'change', () => {\n\t\t\tthis.refresh();\n\t\t} );\n\n\t\tthis.on( 'execute', evt => {\n\t\t\tif ( !this.isEnabled ) {\n\t\t\t\tevt.stop();\n\t\t\t}\n\t\t}, { priority: 'high' } );\n\n\t\t// By default commands are disabled when the editor is in read-only mode.\n\t\tthis.listenTo( editor, 'change:isReadOnly', ( evt, name, value ) => {\n\t\t\tif ( value ) {\n\t\t\t\tthis.forceDisabled( 'readOnlyMode' );\n\t\t\t} else {\n\t\t\t\tthis.clearForceDisabled( 'readOnlyMode' );\n\t\t\t}\n\t\t} );\n\t}\n\n\t/**\n\t * Refreshes the command. The command should update its {@link #isEnabled} and {@link #value} properties\n\t * in this method.\n\t *\n\t * This method is automatically called when\n\t * {@link module:engine/model/document~Document#event:change any changes are applied to the document}.\n\t */\n\trefresh() {\n\t\tthis.isEnabled = true;\n\t}\n\n\t/**\n\t * Disables the command.\n\t *\n\t * Command may be disabled by multiple features or algorithms (at once). When disabling a command, unique id should be passed\n\t * (e.g. feature name). The same identifier should be used when {@link #clearForceDisabled enabling back} the command.\n\t * The command becomes enabled only after all features {@link #clearForceDisabled enabled it back}.\n\t *\n\t * Disabling and enabling a command:\n\t *\n\t *\t\tcommand.isEnabled; // -> true\n\t *\t\tcommand.forceDisabled( 'MyFeature' );\n\t *\t\tcommand.isEnabled; // -> false\n\t *\t\tcommand.clearForceDisabled( 'MyFeature' );\n\t *\t\tcommand.isEnabled; // -> true\n\t *\n\t * Command disabled by multiple features:\n\t *\n\t *\t\tcommand.forceDisabled( 'MyFeature' );\n\t *\t\tcommand.forceDisabled( 'OtherFeature' );\n\t *\t\tcommand.clearForceDisabled( 'MyFeature' );\n\t *\t\tcommand.isEnabled; // -> false\n\t *\t\tcommand.clearForceDisabled( 'OtherFeature' );\n\t *\t\tcommand.isEnabled; // -> true\n\t *\n\t * Multiple disabling with the same identifier is redundant:\n\t *\n\t *\t\tcommand.forceDisabled( 'MyFeature' );\n\t *\t\tcommand.forceDisabled( 'MyFeature' );\n\t *\t\tcommand.clearForceDisabled( 'MyFeature' );\n\t *\t\tcommand.isEnabled; // -> true\n\t *\n\t * **Note:** some commands or algorithms may have more complex logic when it comes to enabling or disabling certain commands,\n\t * so the command might be still disabled after {@link #clearForceDisabled} was used.\n\t *\n\t * @param {String} id Unique identifier for disabling. Use the same id when {@link #clearForceDisabled enabling back} the command.\n\t */\n\tforceDisabled( id ) {\n\t\tthis._disableStack.add( id );\n\n\t\tif ( this._disableStack.size == 1 ) {\n\t\t\tthis.on( 'set:isEnabled', forceDisable, { priority: 'highest' } );\n\t\t\tthis.isEnabled = false;\n\t\t}\n\t}\n\n\t/**\n\t * Clears forced disable previously set through {@link #forceDisabled}. See {@link #forceDisabled}.\n\t *\n\t * @param {String} id Unique identifier, equal to the one passed in {@link #forceDisabled} call.\n\t */\n\tclearForceDisabled( id ) {\n\t\tthis._disableStack.delete( id );\n\n\t\tif ( this._disableStack.size == 0 ) {\n\t\t\tthis.off( 'set:isEnabled', forceDisable );\n\t\t\tthis.refresh();\n\t\t}\n\t}\n\n\t/**\n\t * Executes the command.\n\t *\n\t * A command may accept parameters. They will be passed from {@link module:core/editor/editor~Editor#execute `editor.execute()`}\n\t * to the command.\n\t *\n\t * The `execute()` method will automatically abort when the command is disabled ({@link #isEnabled} is `false`).\n\t * This behavior is implemented by a high priority listener to the {@link #event:execute} event.\n\t *\n\t * In order to see how to disable a command from \"outside\" see the {@link #isEnabled} documentation.\n\t *\n\t * This method may return a value, which would be forwarded all the way down to the\n\t * {@link module:core/editor/editor~Editor#execute `editor.execute()`}.\n\t *\n\t * @fires execute\n\t */\n\texecute() {}\n\n\t/**\n\t * Destroys the command.\n\t */\n\tdestroy() {\n\t\tthis.stopListening();\n\t}\n\n\t/**\n\t * Event fired by the {@link #execute} method. The command action is a listener to this event so it's\n\t * possible to change/cancel the behavior of the command by listening to this event.\n\t *\n\t * See {@link module:utils/observablemixin~ObservableMixin#decorate} for more information and samples.\n\t *\n\t * **Note:** This event is fired even if command is disabled. However, it is automatically blocked\n\t * by a high priority listener in order to prevent command execution.\n\t *\n\t * @event execute\n\t */\n}\n\nmix( Command, ObservableMixin );\n\n// Helper function that forces command to be disabled.\nfunction forceDisable( evt ) {\n\tevt.return = false;\n\tevt.stop();\n}\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module enter/utils\n */\n\n/**\n * Returns attributes that should be preserved on the enter key.\n *\n * Filtering is realized based on `copyOnEnter` attribute property. Read more about attribute properties\n * {@link module:engine/model/schema~Schema#setAttributeProperties here}.\n *\n * @param {module:engine/model/schema~Schema} schema\n * @param {Iterable.<*>} allAttributes attributes to filter.\n * @returns {Iterable.<*>}\n */\nexport function* getCopyOnEnterAttributes( schema, allAttributes ) {\n\tfor ( const attribute of allAttributes ) {\n\t\tif ( attribute && schema.getAttributeProperties( attribute[ 0 ] ).copyOnEnter ) {\n\t\t\tyield attribute;\n\t\t}\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module enter/entercommand\n */\n\nimport Command from '@ckeditor/ckeditor5-core/src/command';\nimport { getCopyOnEnterAttributes } from './utils';\n\n/**\n * Enter command. It is used by the {@link module:enter/enter~Enter Enter feature} to handle the <kbd>Enter</kbd> key.\n *\n * @extends module:core/command~Command\n */\nexport default class EnterCommand extends Command {\n\t/**\n\t * @inheritDoc\n\t */\n\texecute() {\n\t\tconst model = this.editor.model;\n\t\tconst doc = model.document;\n\n\t\tmodel.change( writer => {\n\t\t\tenterBlock( this.editor.model, writer, doc.selection, model.schema );\n\t\t\tthis.fire( 'afterExecute', { writer } );\n\t\t} );\n\t}\n}\n\n// Creates a new block in the way that the <kbd>Enter</kbd> key is expected to work.\n//\n// @param {module:engine/model~Model} model\n// @param {module:engine/model/writer~Writer} writer\n// @param {module:engine/model/selection~Selection|module:engine/model/documentselection~DocumentSelection} selection\n// Selection on which the action should be performed.\n// @param {module:engine/model/schema~Schema} schema\nfunction enterBlock( model, writer, selection, schema ) {\n\tconst isSelectionEmpty = selection.isCollapsed;\n\tconst range = selection.getFirstRange();\n\tconst startElement = range.start.parent;\n\tconst endElement = range.end.parent;\n\n\t// Don't touch the roots and other limit elements.\n\tif ( schema.isLimit( startElement ) || schema.isLimit( endElement ) ) {\n\t\t// Delete the selected content but only if inside a single limit element.\n\t\t// Abort, when crossing limit elements boundary (e.g. <limit1>x[x</limit1>donttouchme<limit2>y]y</limit2>).\n\t\t// This is an edge case and it's hard to tell what should actually happen because such a selection\n\t\t// is not entirely valid.\n\t\tif ( !isSelectionEmpty && startElement == endElement ) {\n\t\t\tmodel.deleteContent( selection );\n\t\t}\n\n\t\treturn;\n\t}\n\n\tif ( isSelectionEmpty ) {\n\t\tconst attributesToCopy = getCopyOnEnterAttributes( writer.model.schema, selection.getAttributes() );\n\t\tsplitBlock( writer, range.start );\n\t\twriter.setSelectionAttribute( attributesToCopy );\n\t} else {\n\t\tconst leaveUnmerged = !( range.start.isAtStart && range.end.isAtEnd );\n\t\tconst isContainedWithinOneElement = ( startElement == endElement );\n\n\t\tmodel.deleteContent( selection, { leaveUnmerged } );\n\n\t\tif ( leaveUnmerged ) {\n\t\t\t// Partially selected elements.\n\t\t\t//\n\t\t\t// <h>x[xx]x</h>\t\t-> <h>x^x</h>\t\t\t-> <h>x</h><h>^x</h>\n\t\t\tif ( isContainedWithinOneElement ) {\n\t\t\t\tsplitBlock( writer, selection.focus );\n\t\t\t}\n\t\t\t// Selection over multiple elements.\n\t\t\t//\n\t\t\t// <h>x[x</h><p>y]y<p>\t-> <h>x^</h><p>y</p>\t-> <h>x</h><p>^y</p>\n\t\t\telse {\n\t\t\t\twriter.setSelection( endElement, 0 );\n\t\t\t}\n\t\t}\n\t}\n}\n\nfunction splitBlock( writer, splitPos ) {\n\twriter.split( splitPos );\n\twriter.setSelection( splitPos.parent.nextSibling, 0 );\n}\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module enter/enterobserver\n */\n\nimport Observer from '@ckeditor/ckeditor5-engine/src/view/observer/observer';\nimport DomEventData from '@ckeditor/ckeditor5-engine/src/view/observer/domeventdata';\nimport { keyCodes } from '@ckeditor/ckeditor5-utils/src/keyboard';\n\n/**\n * Enter observer introduces the {@link module:engine/view/document~Document#event:enter} event.\n *\n * @extends module:engine/view/observer/observer~Observer\n */\nexport default class EnterObserver extends Observer {\n\tconstructor( view ) {\n\t\tsuper( view );\n\n\t\tconst doc = this.document;\n\n\t\tdoc.on( 'keydown', ( evt, data ) => {\n\t\t\tif ( this.isEnabled && data.keyCode == keyCodes.enter ) {\n\t\t\t\t// Save the event object to check later if it was stopped or not.\n\t\t\t\tlet event;\n\t\t\t\tdoc.once( 'enter', evt => ( event = evt ), { priority: 'highest' } );\n\n\t\t\t\tdoc.fire( 'enter', new DomEventData( doc, data.domEvent, {\n\t\t\t\t\tisSoft: data.shiftKey\n\t\t\t\t} ) );\n\n\t\t\t\t// Stop `keydown` event if `enter` event was stopped.\n\t\t\t\t// https://github.com/ckeditor/ckeditor5/issues/753\n\t\t\t\tif ( event && event.stop.called ) {\n\t\t\t\t\tevt.stop();\n\t\t\t\t}\n\t\t\t}\n\t\t} );\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tobserve() {}\n}\n\n/**\n * Event fired when the user presses the <kbd>Enter</kbd> key.\n *\n * Note: This event is fired by the {@link module:enter/enterobserver~EnterObserver observer}\n * (usually registered by the {@link module:enter/enter~Enter Enter feature} and\n * {@link module:enter/shiftenter~ShiftEnter ShiftEnter feature}).\n *\n * @event module:engine/view/document~Document#event:enter\n * @param {module:engine/view/observer/domeventdata~DomEventData} data\n * @param {Boolean} data.isSoft Whether it's a soft enter (<kbd>Shift</kbd>+<kbd>Enter</kbd>) or hard enter (<kbd>Enter</kbd>).\n */\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module enter/enter\n */\n\nimport Plugin from '@ckeditor/ckeditor5-core/src/plugin';\nimport EnterCommand from './entercommand';\nimport EnterObserver from './enterobserver';\n\n/**\n * This plugin handles the <kbd>Enter</kbd> key (hard line break) in the editor.\n *\n * See also the {@link module:enter/shiftenter~ShiftEnter} plugin.\n *\n * For more information about this feature see the {@glink api/enter package page}.\n *\n * @extends module:core/plugin~Plugin\n */\nexport default class Enter extends Plugin {\n\t/**\n\t * @inheritDoc\n\t */\n\tstatic get pluginName() {\n\t\treturn 'Enter';\n\t}\n\n\tinit() {\n\t\tconst editor = this.editor;\n\t\tconst view = editor.editing.view;\n\t\tconst viewDocument = view.document;\n\n\t\tview.addObserver( EnterObserver );\n\n\t\teditor.commands.add( 'enter', new EnterCommand( editor ) );\n\n\t\tthis.listenTo( viewDocument, 'enter', ( evt, data ) => {\n\t\t\tdata.preventDefault();\n\n\t\t\t// The soft enter key is handled by the ShiftEnter plugin.\n\t\t\tif ( data.isSoft ) {\n\t\t\t\treturn;\n\t\t\t}\n\n\t\t\teditor.execute( 'enter' );\n\t\t\tview.scrollToTheSelection();\n\t\t}, { priority: 'low' } );\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module enter/shiftentercommand\n */\n\nimport Command from '@ckeditor/ckeditor5-core/src/command';\nimport { getCopyOnEnterAttributes } from './utils';\n\n/**\n * ShiftEnter command. It is used by the {@link module:enter/shiftenter~ShiftEnter ShiftEnter feature} to handle\n * the <kbd>Shift</kbd>+<kbd>Enter</kbd> keystroke.\n *\n * @extends module:core/command~Command\n */\nexport default class ShiftEnterCommand extends Command {\n\t/**\n\t * @inheritDoc\n\t */\n\texecute() {\n\t\tconst model = this.editor.model;\n\t\tconst doc = model.document;\n\n\t\tmodel.change( writer => {\n\t\t\tsoftBreakAction( model, writer, doc.selection );\n\t\t\tthis.fire( 'afterExecute', { writer } );\n\t\t} );\n\t}\n\n\trefresh() {\n\t\tconst model = this.editor.model;\n\t\tconst doc = model.document;\n\n\t\tthis.isEnabled = isEnabled( model.schema, doc.selection );\n\t}\n}\n\n// Checks whether the ShiftEnter command should be enabled in the specified selection.\n//\n// @param {module:engine/model/schema~Schema} schema\n// @param {module:engine/model/selection~Selection|module:engine/model/documentselection~DocumentSelection} selection\nfunction isEnabled( schema, selection ) {\n\t// At this moment it is okay to support single range selections only.\n\t// But in the future we may need to change that.\n\tif ( selection.rangeCount > 1 ) {\n\t\treturn false;\n\t}\n\n\tconst anchorPos = selection.anchor;\n\n\t// Check whether the break element can be inserted in the current selection anchor.\n\tif ( !anchorPos || !schema.checkChild( anchorPos, 'softBreak' ) ) {\n\t\treturn false;\n\t}\n\n\tconst range = selection.getFirstRange();\n\tconst startElement = range.start.parent;\n\tconst endElement = range.end.parent;\n\n\t// Do not modify the content if selection is cross-limit elements.\n\tif ( ( isInsideLimitElement( startElement, schema ) || isInsideLimitElement( endElement, schema ) ) && startElement !== endElement ) {\n\t\treturn false;\n\t}\n\n\treturn true;\n}\n\n// Creates a break in the way that the <kbd>Shift</kbd>+<kbd>Enter</kbd> keystroke is expected to work.\n//\n// @param {module:engine/model~Model} model\n// @param {module:engine/model/writer~Writer} writer\n// @param {module:engine/model/selection~Selection|module:engine/model/documentselection~DocumentSelection} selection\n// Selection on which the action should be performed.\nfunction softBreakAction( model, writer, selection ) {\n\tconst isSelectionEmpty = selection.isCollapsed;\n\tconst range = selection.getFirstRange();\n\tconst startElement = range.start.parent;\n\tconst endElement = range.end.parent;\n\tconst isContainedWithinOneElement = ( startElement == endElement );\n\n\tif ( isSelectionEmpty ) {\n\t\tconst attributesToCopy = getCopyOnEnterAttributes( model.schema, selection.getAttributes() );\n\t\tinsertBreak( model, writer, range.end );\n\n\t\twriter.removeSelectionAttribute( selection.getAttributeKeys() );\n\t\twriter.setSelectionAttribute( attributesToCopy );\n\t} else {\n\t\tconst leaveUnmerged = !( range.start.isAtStart && range.end.isAtEnd );\n\t\tmodel.deleteContent( selection, { leaveUnmerged } );\n\n\t\t// Selection within one element:\n\t\t//\n\t\t// <h>x[xx]x</h>\t\t-> <h>x^x</h>\t\t\t-> <h>x<br>^x</h>\n\t\tif ( isContainedWithinOneElement ) {\n\t\t\tinsertBreak( model, writer, selection.focus );\n\t\t}\n\t\t// Selection over multiple elements.\n\t\t//\n\t\t// <h>x[x</h><p>y]y<p>\t-> <h>x^</h><p>y</p>\t-> <h>x</h><p>^y</p>\n\t\t//\n\t\t// We chose not to insert a line break in this case because:\n\t\t//\n\t\t// * it's not a very common scenario,\n\t\t// * it actually surprised me when I saw the \"expected behavior\" in real life.\n\t\t//\n\t\t// It's ok if the user will need to be more specific where they want the <br> to be inserted.\n\t\telse {\n\t\t\t// Move the selection to the 2nd element (last step of the example above).\n\t\t\tif ( leaveUnmerged ) {\n\t\t\t\twriter.setSelection( endElement, 0 );\n\t\t\t}\n\t\t}\n\t}\n}\n\nfunction insertBreak( model, writer, position ) {\n\tconst breakLineElement = writer.createElement( 'softBreak' );\n\n\tmodel.insertContent( breakLineElement, position );\n\twriter.setSelection( breakLineElement, 'after' );\n}\n\n// Checks whether the specified `element` is a child of the limit element.\n//\n// Checking whether the `<p>` element is inside a limit element:\n//   - <$root><p>Text.</p></$root> => false\n//   - <$root><limitElement><p>Text</p></limitElement></$root> => true\n//\n// @param {module:engine/model/element~Element} element\n// @param {module:engine/schema~Schema} schema\n// @returns {Boolean}\nfunction isInsideLimitElement( element, schema ) {\n\t// `$root` is a limit element but in this case is an invalid element.\n\tif ( element.is( 'rootElement' ) ) {\n\t\treturn false;\n\t}\n\n\treturn schema.isLimit( element ) || isInsideLimitElement( element.parent, schema );\n}\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module enter/shiftenter\n */\n\nimport ShiftEnterCommand from './shiftentercommand';\nimport EnterObserver from './enterobserver';\nimport Plugin from '@ckeditor/ckeditor5-core/src/plugin';\n\n/**\n * This plugin handles the <kbd>Shift</kbd>+<kbd>Enter</kbd> keystroke (soft line break) in the editor.\n *\n * See also the {@link module:enter/enter~Enter} plugin.\n *\n * For more information about this feature see the {@glink api/enter package page}.\n *\n * @extends module:core/plugin~Plugin\n */\nexport default class ShiftEnter extends Plugin {\n\t/**\n\t * @inheritDoc\n\t */\n\tstatic get pluginName() {\n\t\treturn 'ShiftEnter';\n\t}\n\n\tinit() {\n\t\tconst editor = this.editor;\n\t\tconst schema = editor.model.schema;\n\t\tconst conversion = editor.conversion;\n\t\tconst view = editor.editing.view;\n\t\tconst viewDocument = view.document;\n\n\t\t// Configure the schema.\n\t\tschema.register( 'softBreak', {\n\t\t\tallowWhere: '$text',\n\t\t\tisInline: true\n\t\t} );\n\n\t\t// Configure converters.\n\t\tconversion.for( 'upcast' )\n\t\t\t.elementToElement( {\n\t\t\t\tmodel: 'softBreak',\n\t\t\t\tview: 'br'\n\t\t\t} );\n\n\t\tconversion.for( 'downcast' )\n\t\t\t.elementToElement( {\n\t\t\t\tmodel: 'softBreak',\n\t\t\t\tview: ( modelElement, { writer } ) => writer.createEmptyElement( 'br' )\n\t\t\t} );\n\n\t\tview.addObserver( EnterObserver );\n\n\t\teditor.commands.add( 'shiftEnter', new ShiftEnterCommand( editor ) );\n\n\t\tthis.listenTo( viewDocument, 'enter', ( evt, data ) => {\n\t\t\tdata.preventDefault();\n\n\t\t\t// The hard enter key is handled by the Enter plugin.\n\t\t\tif ( !data.isSoft ) {\n\t\t\t\treturn;\n\t\t\t}\n\n\t\t\teditor.execute( 'shiftEnter' );\n\t\t\tview.scrollToTheSelection();\n\t\t}, { priority: 'low' } );\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module select-all/selectallcommand\n */\n\nimport Command from '@ckeditor/ckeditor5-core/src/command';\n\n/**\n * The select all command.\n *\n * It is used by the {@link module:select-all/selectallediting~SelectAllEditing select all editing feature} to handle\n * the <kbd>Ctrl/⌘</kbd>+<kbd>A</kbd> keystroke.\n *\n * Executing this command changes the {@glink framework/guides/architecture/editing-engine#model model}\n * selection so it contains the entire content of the editable root of the editor the selection is\n * {@link module:engine/model/selection~Selection#anchor anchored} in.\n *\n * If the selection was anchored in a {@glink framework/guides/tutorials/implementing-a-block-widget nested editable}\n * (e.g. a caption of an image), the new selection will contain its entire content. Successive executions of this command\n * will expand the selection to encompass more and more content up to the entire editable root of the editor.\n *\n * @extends module:core/command~Command\n */\nexport default class SelectAllCommand extends Command {\n\t/**\n\t * @inheritDoc\n\t */\n\texecute() {\n\t\tconst model = this.editor.model;\n\t\tconst selection = model.document.selection;\n\t\tlet scopeElement = model.schema.getLimitElement( selection );\n\n\t\t// If an entire scope is selected, or the selection's ancestor is not a scope yet,\n\t\t// browse through ancestors to find the enclosing parent scope.\n\t\tif ( selection.containsEntireContent( scopeElement ) || !isSelectAllScope( model.schema, scopeElement ) ) {\n\t\t\tdo {\n\t\t\t\tscopeElement = scopeElement.parent;\n\n\t\t\t\t// Do nothing, if the entire `root` is already selected.\n\t\t\t\tif ( !scopeElement ) {\n\t\t\t\t\treturn;\n\t\t\t\t}\n\t\t\t} while ( !isSelectAllScope( model.schema, scopeElement ) );\n\t\t}\n\n\t\tmodel.change( writer => {\n\t\t\twriter.setSelection( scopeElement, 'in' );\n\t\t} );\n\t}\n}\n\n// Checks whether the element is a valid select-all scope.\n// Returns true, if the element is a {@link module:engine/model/schema~Schema#isLimit limit},\n// and can contain any text or paragraph.\n//\n// @param {module:engine/model/schema~Schema} schema The schema to check against.\n// @param {module:engine/model/element~Element} element\n// @return {Boolean}\nfunction isSelectAllScope( schema, element ) {\n\treturn schema.isLimit( element ) && ( schema.checkChild( element, '$text' ) || schema.checkChild( element, 'paragraph' ) );\n}\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module select-all/selectallediting\n */\n\nimport Plugin from '@ckeditor/ckeditor5-core/src/plugin';\nimport { getCode, parseKeystroke } from '@ckeditor/ckeditor5-utils/src/keyboard';\nimport SelectAllCommand from './selectallcommand';\n\nconst SELECT_ALL_KEYSTROKE = parseKeystroke( 'Ctrl+A' );\n\n/**\n * The select all editing feature.\n *\n * It registers the `'selectAll'` {@link module:select-all/selectallcommand~SelectAllCommand command}\n * and the <kbd>Ctrl/⌘</kbd>+<kbd>A</kbd> keystroke listener which executes it.\n *\n * @extends module:core/plugin~Plugin\n */\nexport default class SelectAllEditing extends Plugin {\n\t/**\n\t * @inheritDoc\n\t */\n\tstatic get pluginName() {\n\t\treturn 'SelectAllEditing';\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tinit() {\n\t\tconst editor = this.editor;\n\t\tconst view = editor.editing.view;\n\t\tconst viewDocument = view.document;\n\n\t\teditor.commands.add( 'selectAll', new SelectAllCommand( editor ) );\n\n\t\tthis.listenTo( viewDocument, 'keydown', ( eventInfo, domEventData ) => {\n\t\t\tif ( getCode( domEventData ) === SELECT_ALL_KEYSTROKE ) {\n\t\t\t\teditor.execute( 'selectAll' );\n\t\t\t\tdomEventData.preventDefault();\n\t\t\t}\n\t\t} );\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module select-all/selectallui\n */\n\nimport Plugin from '@ckeditor/ckeditor5-core/src/plugin';\nimport ButtonView from '@ckeditor/ckeditor5-ui/src/button/buttonview';\n\nimport selectAllIcon from '../theme/icons/select-all.svg';\n\n/**\n * The select all UI feature.\n *\n * It registers the `'selectAll'` UI button in the editor's\n * {@link module:ui/componentfactory~ComponentFactory component factory}. When clicked, the button\n * executes the {@link module:select-all/selectallcommand~SelectAllCommand select all command}.\n *\n * @extends module:core/plugin~Plugin\n */\nexport default class SelectAllUI extends Plugin {\n\t/**\n\t * @inheritDoc\n\t */\n\tstatic get pluginName() {\n\t\treturn 'SelectAllUI';\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tinit() {\n\t\tconst editor = this.editor;\n\n\t\teditor.ui.componentFactory.add( 'selectAll', locale => {\n\t\t\tconst command = editor.commands.get( 'selectAll' );\n\t\t\tconst view = new ButtonView( locale );\n\t\t\tconst t = locale.t;\n\n\t\t\tview.set( {\n\t\t\t\tlabel: t( 'Select all' ),\n\t\t\t\ticon: selectAllIcon,\n\t\t\t\tkeystroke: 'Ctrl+A',\n\t\t\t\ttooltip: true\n\t\t\t} );\n\n\t\t\tview.bind( 'isOn', 'isEnabled' ).to( command, 'value', 'isEnabled' );\n\n\t\t\t// Execute the command.\n\t\t\tthis.listenTo( view, 'execute', () => {\n\t\t\t\teditor.execute( 'selectAll' );\n\t\t\t\teditor.editing.view.focus();\n\t\t\t} );\n\n\t\t\treturn view;\n\t\t} );\n\t}\n}\n","export default \"<svg width=\\\"20\\\" height=\\\"20\\\" xmlns=\\\"http://www.w3.org/2000/svg\\\"><path d=\\\"M.75 15.5a.75.75 0 0 1 .75.75V18l.008.09A.5.5 0 0 0 2 18.5h1.75a.75.75 0 1 1 0 1.5H1.5l-.144-.007a1.5 1.5 0 0 1-1.35-1.349L0 18.5v-2.25a.75.75 0 0 1 .75-.75zm18.5 0a.75.75 0 0 1 .75.75v2.25l-.007.144a1.5 1.5 0 0 1-1.349 1.35L18.5 20h-2.25a.75.75 0 1 1 0-1.5H18a.5.5 0 0 0 .492-.41L18.5 18v-1.75a.75.75 0 0 1 .75-.75zm-10.45 3c.11 0 .2.09.2.2v1.1a.2.2 0 0 1-.2.2H7.2a.2.2 0 0 1-.2-.2v-1.1c0-.11.09-.2.2-.2h1.6zm4 0c.11 0 .2.09.2.2v1.1a.2.2 0 0 1-.2.2h-1.6a.2.2 0 0 1-.2-.2v-1.1c0-.11.09-.2.2-.2h1.6zm.45-5.5a.75.75 0 1 1 0 1.5h-8.5a.75.75 0 1 1 0-1.5h8.5zM1.3 11c.11 0 .2.09.2.2v1.6a.2.2 0 0 1-.2.2H.2a.2.2 0 0 1-.2-.2v-1.6c0-.11.09-.2.2-.2h1.1zm18.5 0c.11 0 .2.09.2.2v1.6a.2.2 0 0 1-.2.2h-1.1a.2.2 0 0 1-.2-.2v-1.6c0-.11.09-.2.2-.2h1.1zm-4.55-2a.75.75 0 1 1 0 1.5H4.75a.75.75 0 1 1 0-1.5h10.5zM1.3 7c.11 0 .2.09.2.2v1.6a.2.2 0 0 1-.2.2H.2a.2.2 0 0 1-.2-.2V7.2c0-.11.09-.2.2-.2h1.1zm18.5 0c.11 0 .2.09.2.2v1.6a.2.2 0 0 1-.2.2h-1.1a.2.2 0 0 1-.2-.2V7.2c0-.11.09-.2.2-.2h1.1zm-4.55-2a.75.75 0 1 1 0 1.5h-2.5a.75.75 0 1 1 0-1.5h2.5zm-5 0a.75.75 0 1 1 0 1.5h-5.5a.75.75 0 0 1 0-1.5h5.5zm-6.5-5a.75.75 0 0 1 0 1.5H2a.5.5 0 0 0-.492.41L1.5 2v1.75a.75.75 0 0 1-1.5 0V1.5l.007-.144A1.5 1.5 0 0 1 1.356.006L1.5 0h2.25zM18.5 0l.144.007a1.5 1.5 0 0 1 1.35 1.349L20 1.5v2.25a.75.75 0 1 1-1.5 0V2l-.008-.09A.5.5 0 0 0 18 1.5h-1.75a.75.75 0 1 1 0-1.5h2.25zM8.8 0c.11 0 .2.09.2.2v1.1a.2.2 0 0 1-.2.2H7.2a.2.2 0 0 1-.2-.2V.2c0-.11.09-.2.2-.2h1.6zm4 0c.11 0 .2.09.2.2v1.1a.2.2 0 0 1-.2.2h-1.6a.2.2 0 0 1-.2-.2V.2c0-.11.09-.2.2-.2h1.6z\\\"/></svg>\";","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module select-all/selectall\n */\n\nimport Plugin from '@ckeditor/ckeditor5-core/src/plugin';\nimport SelectAllEditing from './selectallediting';\nimport SelectAllUI from './selectallui';\n\n/**\n * The select all feature.\n *\n * This is a \"glue\" plugin which loads the {@link module:select-all/selectallediting~SelectAllEditing select all editing feature}\n * and the {@link module:select-all/selectallui~SelectAllUI select all UI feature}.\n *\n * Please refer to the documentation of individual features to learn more.\n *\n * @extends module:core/plugin~Plugin\n */\nexport default class SelectAll extends Plugin {\n\t/**\n\t * @inheritDoc\n\t */\n\tstatic get requires() {\n\t\treturn [ SelectAllEditing, SelectAllUI ];\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tstatic get pluginName() {\n\t\treturn 'SelectAll';\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module typing/utils/changebuffer\n */\n\n/**\n * Change buffer allows to group atomic changes (like characters that have been typed) into\n * {@link module:engine/model/batch~Batch batches}.\n *\n * Batches represent single undo steps, hence changes added to one single batch are undone together.\n *\n * The buffer has a configurable limit of atomic changes that it can accommodate. After the limit was\n * exceeded (see {@link ~ChangeBuffer#input}), a new batch is created in {@link ~ChangeBuffer#batch}.\n *\n * To use the change buffer you need to let it know about the number of changes that were added to the batch:\n *\n *\t\tconst buffer = new ChangeBuffer( model, LIMIT );\n *\n *\t\t// Later on in your feature:\n *\t\tbuffer.batch.insert( pos, insertedCharacters );\n *\t\tbuffer.input( insertedCharacters.length );\n *\n */\nexport default class ChangeBuffer {\n\t/**\n\t * Creates a new instance of the change buffer.\n\t *\n\t * @param {module:engine/model/model~Model} model\n\t * @param {Number} [limit=20] The maximum number of atomic changes which can be contained in one batch.\n\t */\n\tconstructor( model, limit = 20 ) {\n\t\t/**\n\t\t * The model instance.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:engine/model/model~Model} #model\n\t\t */\n\t\tthis.model = model;\n\n\t\t/**\n\t\t * The number of atomic changes in the buffer. Once it exceeds the {@link #limit},\n\t\t * the {@link #batch batch} is set to a new one.\n\t\t *\n\t\t * @readonly\n\t\t * @member {Number} #size\n\t\t */\n\t\tthis.size = 0;\n\n\t\t/**\n\t\t * The maximum number of atomic changes which can be contained in one batch.\n\t\t *\n\t\t * @readonly\n\t\t * @member {Number} #limit\n\t\t */\n\t\tthis.limit = limit;\n\n\t\t/**\n\t\t * Whether the buffer is locked. A locked buffer cannot be reset unless it gets unlocked.\n\t\t *\n\t\t * @readonly\n\t\t * @member {Boolean} #isLocked\n\t\t */\n\t\tthis.isLocked = false;\n\n\t\t// The function to be called in order to notify the buffer about batches which appeared in the document.\n\t\t// The callback will check whether it is a new batch and in that case the buffer will be flushed.\n\t\t//\n\t\t// The reason why the buffer needs to be flushed whenever a new batch appears is that the changes added afterwards\n\t\t// should be added to a new batch. For instance, when the  user types, then inserts an image, and then types again,\n\t\t// the characters typed after inserting the image should be added to a different batch than the characters typed before.\n\t\tthis._changeCallback = ( evt, batch ) => {\n\t\t\tif ( batch.type != 'transparent' && batch !== this._batch ) {\n\t\t\t\tthis._reset( true );\n\t\t\t}\n\t\t};\n\n\t\tthis._selectionChangeCallback = () => {\n\t\t\tthis._reset();\n\t\t};\n\n\t\tthis.model.document.on( 'change', this._changeCallback );\n\n\t\tthis.model.document.selection.on( 'change:range', this._selectionChangeCallback );\n\t\tthis.model.document.selection.on( 'change:attribute', this._selectionChangeCallback );\n\n\t\t/**\n\t\t * The current batch instance.\n\t\t *\n\t\t * @private\n\t\t * @member #_batch\n\t\t */\n\n\t\t/**\n\t\t * The callback to document the change event which later needs to be removed.\n\t\t *\n\t\t * @private\n\t\t * @member #_changeCallback\n\t\t */\n\n\t\t/**\n\t\t * The callback to document selection `change:attribute` and `change:range` events which resets the buffer.\n\t\t *\n\t\t * @private\n\t\t * @member #_selectionChangeCallback\n\t\t */\n\t}\n\n\t/**\n\t * The current batch to which a feature should add its operations. Once the {@link #size}\n\t * is reached or exceeds the {@link #limit}, the batch is set to a new instance and the size is reset.\n\t *\n\t * @type {module:engine/model/batch~Batch}\n\t */\n\tget batch() {\n\t\tif ( !this._batch ) {\n\t\t\tthis._batch = this.model.createBatch();\n\t\t}\n\n\t\treturn this._batch;\n\t}\n\n\t/**\n\t * The input number of changes into the buffer. Once the {@link #size} is\n\t * reached or exceeds the {@link #limit}, the batch is set to a new instance and the size is reset.\n\t *\n\t * @param {Number} changeCount The number of atomic changes to input.\n\t */\n\tinput( changeCount ) {\n\t\tthis.size += changeCount;\n\n\t\tif ( this.size >= this.limit ) {\n\t\t\tthis._reset( true );\n\t\t}\n\t}\n\n\t/**\n\t * Locks the buffer.\n\t */\n\tlock() {\n\t\tthis.isLocked = true;\n\t}\n\n\t/**\n\t * Unlocks the buffer.\n\t */\n\tunlock() {\n\t\tthis.isLocked = false;\n\t}\n\n\t/**\n\t * Destroys the buffer.\n\t */\n\tdestroy() {\n\t\tthis.model.document.off( 'change', this._changeCallback );\n\t\tthis.model.document.selection.off( 'change:range', this._selectionChangeCallback );\n\t\tthis.model.document.selection.off( 'change:attribute', this._selectionChangeCallback );\n\t}\n\n\t/**\n\t * Resets the change buffer.\n\t *\n\t * @private\n\t * @param {Boolean} [ignoreLock] Whether internal lock {@link #isLocked} should be ignored.\n\t */\n\t_reset( ignoreLock ) {\n\t\tif ( !this.isLocked || ignoreLock ) {\n\t\t\tthis._batch = null;\n\t\t\tthis.size = 0;\n\t\t}\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module typing/inputcommand\n */\n\nimport Command from '@ckeditor/ckeditor5-core/src/command';\n\nimport ChangeBuffer from './utils/changebuffer';\n\n/**\n * The input command. Used by the {@link module:typing/input~Input input feature} to handle typing.\n *\n * @extends module:core/command~Command\n */\nexport default class InputCommand extends Command {\n\t/**\n\t * Creates an instance of the command.\n\t *\n\t * @param {module:core/editor/editor~Editor} editor\n\t * @param {Number} undoStepSize The maximum number of atomic changes\n\t * which can be contained in one batch in the command buffer.\n\t */\n\tconstructor( editor, undoStepSize ) {\n\t\tsuper( editor );\n\n\t\t/**\n\t\t * Typing's change buffer used to group subsequent changes into batches.\n\t\t *\n\t\t * @readonly\n\t\t * @private\n\t\t * @member {module:typing/utils/changebuffer~ChangeBuffer} #_buffer\n\t\t */\n\t\tthis._buffer = new ChangeBuffer( editor.model, undoStepSize );\n\n\t\t/**\n\t\t * Stores batches created by the input command. The batches are used to differentiate input batches from other batches using\n\t\t * {@link module:typing/input~Input#isInput} method.\n\t\t *\n\t\t * @type {WeakSet<module:engine/model/batch~Batch>}\n\t\t * @protected\n\t\t */\n\t\tthis._batches = new WeakSet();\n\t}\n\n\t/**\n\t * The current change buffer.\n\t *\n\t * @type {module:typing/utils/changebuffer~ChangeBuffer}\n\t */\n\tget buffer() {\n\t\treturn this._buffer;\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tdestroy() {\n\t\tsuper.destroy();\n\n\t\tthis._buffer.destroy();\n\t}\n\n\t/**\n\t * Executes the input command. It replaces the content within the given range with the given text.\n\t * Replacing is a two step process, first the content within the range is removed and then the new text is inserted\n\t * at the beginning of the range (which after the removal is a collapsed range).\n\t *\n\t * @fires execute\n\t * @param {Object} [options] The command options.\n\t * @param {String} [options.text=''] The text to be inserted.\n\t * @param {module:engine/model/range~Range} [options.range] The range in which the text is inserted. Defaults\n\t * to the first range in the current selection.\n\t * @param {module:engine/model/range~Range} [options.resultRange] The range where the selection\n\t * should be placed after the insertion. If not specified, the selection will be placed right after\n\t * the inserted text.\n\t */\n\texecute( options = {} ) {\n\t\tconst model = this.editor.model;\n\t\tconst doc = model.document;\n\t\tconst text = options.text || '';\n\t\tconst textInsertions = text.length;\n\t\tconst selection = options.range ? model.createSelection( options.range ) : doc.selection;\n\t\tconst resultRange = options.resultRange;\n\n\t\tmodel.enqueueChange( this._buffer.batch, writer => {\n\t\t\tthis._buffer.lock();\n\n\t\t\t// Store the batch as an 'input' batch for the Input.isInput( batch ) check.\n\t\t\tthis._batches.add( this._buffer.batch );\n\n\t\t\tmodel.deleteContent( selection );\n\n\t\t\tif ( text ) {\n\t\t\t\tmodel.insertContent( writer.createText( text, doc.selection.getAttributes() ), selection );\n\t\t\t}\n\n\t\t\tif ( resultRange ) {\n\t\t\t\twriter.setSelection( resultRange );\n\t\t\t} else if ( !selection.is( 'documentSelection' ) ) {\n\t\t\t\twriter.setSelection( selection );\n\t\t\t}\n\n\t\t\tthis._buffer.unlock();\n\n\t\t\tthis._buffer.input( textInsertions );\n\t\t} );\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module typing/utils/injectunsafekeystrokeshandling\n */\n\nimport { getCode } from '@ckeditor/ckeditor5-utils/src/keyboard';\nimport env from '@ckeditor/ckeditor5-utils/src/env';\n\n/**\n * Handles keystrokes which are unsafe for typing. This handler's logic is explained\n * in https://github.com/ckeditor/ckeditor5-typing/issues/83#issuecomment-398690251.\n *\n * @param {module:core/editor/editor~Editor} editor The editor instance.\n */\nexport default function injectUnsafeKeystrokesHandling( editor ) {\n\tlet latestCompositionSelection = null;\n\n\tconst model = editor.model;\n\tconst view = editor.editing.view;\n\tconst inputCommand = editor.commands.get( 'input' );\n\n\t// For Android, we want to handle keystrokes on `beforeinput` to be sure that code in `DeleteObserver` already had a chance to be fired.\n\tif ( env.isAndroid ) {\n\t\tview.document.on( 'beforeinput', ( evt, evtData ) => handleUnsafeKeystroke( evtData ), { priority: 'lowest' } );\n\t} else {\n\t\tview.document.on( 'keydown', ( evt, evtData ) => handleUnsafeKeystroke( evtData ), { priority: 'lowest' } );\n\t}\n\n\tview.document.on( 'compositionstart', handleCompositionStart, { priority: 'lowest' } );\n\n\tview.document.on( 'compositionend', () => {\n\t\tlatestCompositionSelection = model.createSelection( model.document.selection );\n\t}, { priority: 'lowest' } );\n\n\t// Handles the keydown event. We need to guess whether such keystroke is going to result\n\t// in typing. If so, then before character insertion happens, any selected content needs\n\t// to be deleted. Otherwise the default browser deletion mechanism would be\n\t// triggered, resulting in:\n\t//\n\t// * Hundreds of mutations which could not be handled.\n\t// * But most importantly, loss of control over how the content is being deleted.\n\t//\n\t// The method is used in a low-priority listener, hence allowing other listeners (e.g. delete or enter features)\n\t// to handle the event.\n\t//\n\t// @param {module:engine/view/observer/keyobserver~KeyEventData} evtData\n\tfunction handleUnsafeKeystroke( evtData ) {\n\t\tconst doc = model.document;\n\t\tconst isComposing = view.document.isComposing;\n\t\tconst isSelectionUnchanged = latestCompositionSelection && latestCompositionSelection.isEqual( doc.selection );\n\n\t\t// Reset stored composition selection.\n\t\tlatestCompositionSelection = null;\n\n\t\t// By relying on the state of the input command we allow disabling the entire input easily\n\t\t// by just disabling the input command. We could’ve used here the delete command but that\n\t\t// would mean requiring the delete feature which would block loading one without the other.\n\t\t// We could also check the editor.isReadOnly property, but that wouldn't allow to block\n\t\t// the input without blocking other features.\n\t\tif ( !inputCommand.isEnabled ) {\n\t\t\treturn;\n\t\t}\n\n\t\tif ( isNonTypingKeystroke( evtData ) || doc.selection.isCollapsed ) {\n\t\t\treturn;\n\t\t}\n\n\t\t// If during composition, deletion should be prevented as it may remove composed sequence (#83).\n\t\tif ( isComposing && evtData.keyCode === 229 ) {\n\t\t\treturn;\n\t\t}\n\n\t\t// If there is a `keydown` event fired with '229' keycode it might be related\n\t\t// to recent composition. Check if selection is the same as upon ending recent composition,\n\t\t// if so do not remove selected content as it will remove composed sequence (#83).\n\t\tif ( !isComposing && evtData.keyCode === 229 && isSelectionUnchanged ) {\n\t\t\treturn;\n\t\t}\n\n\t\tdeleteSelectionContent();\n\t}\n\n\t// Handles the `compositionstart` event. It is used only in special cases to remove the contents\n\t// of a non-collapsed selection so composition itself does not result in complex mutations.\n\t//\n\t// The special case mentioned above is a situation in which the `keydown` event is fired after\n\t// `compositionstart` event. In such cases {@link #handleKeydown} cannot clear current selection\n\t// contents (because it is too late and will break the composition) so the composition handler takes care of it.\n\tfunction handleCompositionStart() {\n\t\tconst doc = model.document;\n\t\tconst isFlatSelection = doc.selection.rangeCount === 1 ? doc.selection.getFirstRange().isFlat : true;\n\n\t\t// If on `compositionstart` there is a non-collapsed selection which start and end have different parents\n\t\t// it means the `handleKeydown()` method did not remove its contents. It happens usually because\n\t\t// of different order of events (`compositionstart` before `keydown` - in Safari). In such cases\n\t\t// we need to remove selection contents on composition start (#83).\n\t\tif ( doc.selection.isCollapsed || isFlatSelection ) {\n\t\t\treturn;\n\t\t}\n\n\t\tdeleteSelectionContent();\n\t}\n\n\tfunction deleteSelectionContent() {\n\t\tconst buffer = inputCommand.buffer;\n\n\t\tbuffer.lock();\n\n\t\tconst batch = buffer.batch;\n\t\tinputCommand._batches.add( batch );\n\n\t\tmodel.enqueueChange( batch, () => {\n\t\t\tmodel.deleteContent( model.document.selection );\n\t\t} );\n\n\t\tbuffer.unlock();\n\t}\n}\n\nconst safeKeycodes = [\n\tgetCode( 'arrowUp' ),\n\tgetCode( 'arrowRight' ),\n\tgetCode( 'arrowDown' ),\n\tgetCode( 'arrowLeft' ),\n\t9, // Tab\n\t16, // Shift\n\t17, // Ctrl\n\t18, // Alt\n\t19, // Pause\n\t20, // CapsLock\n\t27, // Escape\n\t33, // PageUp\n\t34, // PageDown\n\t35, // Home\n\t36, // End,\n\t45, // Insert,\n\t91, // Windows,\n\t93, // Menu key,\n\t144, // NumLock\n\t145, // ScrollLock,\n\t173, // Mute/Unmute\n\t174, // Volume up\n\t175, // Volume down,\n\t176, // Next song,\n\t177, // Previous song,\n\t178, // Stop,\n\t179, // Play/Pause,\n\t255 // Display brightness (increase and decrease)\n];\n\n// Function keys.\nfor ( let code = 112; code <= 135; code++ ) {\n\tsafeKeycodes.push( code );\n}\n\n/**\n * Returns `true` if a keystroke will **not** result in \"typing\".\n *\n * For instance, keystrokes that result in typing are letters \"a-zA-Z\", numbers \"0-9\", delete, backspace, etc.\n *\n * Keystrokes that do not cause typing are, for instance, Fn keys (F5, F8, etc.), arrow keys (←, →, ↑, ↓),\n * Tab (↹), \"Windows logo key\" (⊞ Win), etc.\n *\n * Note: This implementation is very simple and will need to be refined with time.\n *\n * @param {module:engine/view/observer/keyobserver~KeyEventData} keyData\n * @returns {Boolean}\n */\nexport function isNonTypingKeystroke( keyData ) {\n\t// Keystrokes which contain Ctrl don't represent typing.\n\tif ( keyData.ctrlKey ) {\n\t\treturn true;\n\t}\n\n\treturn safeKeycodes.includes( keyData.keyCode );\n}\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module typing/utils/utils\n */\n\nimport diff from '@ckeditor/ckeditor5-utils/src/diff';\nimport diffToChanges from '@ckeditor/ckeditor5-utils/src/difftochanges';\n\n/**\n * Returns true if container children have mutated or more than a single text node was changed.\n *\n * @private\n * @param {Array.<module:engine/view/observer/mutationobserver~MutatedText|\n * module:engine/view/observer/mutationobserver~MutatedChildren>} mutations\n * @returns {Boolean}\n */\nexport function containerChildrenMutated( mutations ) {\n\tif ( mutations.length == 0 ) {\n\t\treturn false;\n\t}\n\n\t// Check if there is any mutation of `children` type or any mutation that changes more than one text node.\n\tfor ( const mutation of mutations ) {\n\t\tif ( mutation.type === 'children' && !getSingleTextNodeChange( mutation ) ) {\n\t\t\treturn true;\n\t\t}\n\t}\n\n\treturn false;\n}\n\n/**\n * Returns change made to a single text node.\n *\n * @private\n * @param {module:engine/view/observer/mutationobserver~MutatedText|\n * module:engine/view/observer/mutationobserver~MutatedChildren} mutation\n * @returns {Object|undefined} Change object (see {@link module:utils/difftochanges~diffToChanges} output)\n * or undefined if more than a single text node was changed.\n */\nexport function getSingleTextNodeChange( mutation ) {\n\t// One new node.\n\tif ( mutation.newChildren.length - mutation.oldChildren.length != 1 ) {\n\t\treturn;\n\t}\n\n\t// Which is text.\n\tconst diffResult = diff( mutation.oldChildren, mutation.newChildren, compareChildNodes );\n\tconst changes = diffToChanges( diffResult, mutation.newChildren );\n\n\t// In case of [ delete, insert, insert ] the previous check will not exit.\n\tif ( changes.length > 1 ) {\n\t\treturn;\n\t}\n\n\tconst change = changes[ 0 ];\n\n\t// Which is text.\n\tif ( !( !!change.values[ 0 ] && change.values[ 0 ].is( '$text' ) ) ) {\n\t\treturn;\n\t}\n\n\treturn change;\n}\n\n/**\n * Checks whether two view nodes are identical, which means they are the same object\n * or contain exactly same data (in case of text nodes).\n *\n * @private\n * @param {module:engine/view/node~Node} oldChild\n * @param {module:engine/view/node~Node} newChild\n * @returns {Boolean}\n */\nexport function compareChildNodes( oldChild, newChild ) {\n\tif ( !!oldChild && oldChild.is( '$text' ) && !!newChild && newChild.is( '$text' ) ) {\n\t\treturn oldChild.data === newChild.data;\n\t} else {\n\t\treturn oldChild === newChild;\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module utils/difftochanges\n */\n\n/**\n * Creates a set of changes which need to be applied to the input in order to transform\n * it into the output. This function can be used with strings or arrays.\n *\n *\t\tconst input = Array.from( 'abc' );\n *\t\tconst output = Array.from( 'xaby' );\n *\t\tconst changes = diffToChanges( diff( input, output ), output );\n *\n *\t\tchanges.forEach( change => {\n *\t\t\tif ( change.type == 'insert' ) {\n *\t\t\t\tinput.splice( change.index, 0, ...change.values );\n *\t\t\t} else if ( change.type == 'delete' ) {\n *\t\t\t\tinput.splice( change.index, change.howMany );\n *\t\t\t}\n *\t\t} );\n *\n *\t\tinput.join( '' ) == output.join( '' ); // -> true\n *\n * @param {Array.<'equal'|'insert'|'delete'>} diff Result of {@link module:utils/diff~diff}.\n * @param {String|Array} output The string or array which was passed as diff's output.\n * @returns {Array.<Object>} Set of changes (insert or delete) which need to be applied to the input\n * in order to transform it into the output.\n */\nexport default function diffToChanges( diff, output ) {\n\tconst changes = [];\n\tlet index = 0;\n\tlet lastOperation;\n\n\tdiff.forEach( change => {\n\t\tif ( change == 'equal' ) {\n\t\t\tpushLast();\n\n\t\t\tindex++;\n\t\t} else if ( change == 'insert' ) {\n\t\t\tif ( isContinuationOf( 'insert' ) ) {\n\t\t\t\tlastOperation.values.push( output[ index ] );\n\t\t\t} else {\n\t\t\t\tpushLast();\n\n\t\t\t\tlastOperation = {\n\t\t\t\t\ttype: 'insert',\n\t\t\t\t\tindex,\n\t\t\t\t\tvalues: [ output[ index ] ]\n\t\t\t\t};\n\t\t\t}\n\n\t\t\tindex++;\n\t\t} else /* if ( change == 'delete' ) */ {\n\t\t\tif ( isContinuationOf( 'delete' ) ) {\n\t\t\t\tlastOperation.howMany++;\n\t\t\t} else {\n\t\t\t\tpushLast();\n\n\t\t\t\tlastOperation = {\n\t\t\t\t\ttype: 'delete',\n\t\t\t\t\tindex,\n\t\t\t\t\thowMany: 1\n\t\t\t\t};\n\t\t\t}\n\t\t}\n\t} );\n\n\tpushLast();\n\n\treturn changes;\n\n\tfunction pushLast() {\n\t\tif ( lastOperation ) {\n\t\t\tchanges.push( lastOperation );\n\t\t\tlastOperation = null;\n\t\t}\n\t}\n\n\tfunction isContinuationOf( expected ) {\n\t\treturn lastOperation && lastOperation.type == expected;\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module typing/utils/injecttypingmutationshandling\n */\n\nimport diff from '@ckeditor/ckeditor5-utils/src/diff';\nimport DomConverter from '@ckeditor/ckeditor5-engine/src/view/domconverter';\n\nimport { getSingleTextNodeChange, containerChildrenMutated } from './utils';\n\n/**\n * Handles mutations caused by normal typing.\n *\n * @param {module:core/editor/editor~Editor} editor The editor instance.\n */\nexport default function injectTypingMutationsHandling( editor ) {\n\teditor.editing.view.document.on( 'mutations', ( evt, mutations, viewSelection ) => {\n\t\tnew MutationHandler( editor ).handle( mutations, viewSelection );\n\t} );\n}\n\n/**\n * Helper class for translating DOM mutations into model changes.\n *\n * @private\n */\nclass MutationHandler {\n\t/**\n\t * Creates an instance of the mutation handler.\n\t *\n\t * @param {module:core/editor/editor~Editor} editor\n\t */\n\tconstructor( editor ) {\n\t\t/**\n\t\t * Editor instance for which mutations are handled.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:core/editor/editor~Editor} #editor\n\t\t */\n\t\tthis.editor = editor;\n\n\t\t/**\n\t\t * The editing controller.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:engine/controller/editingcontroller~EditingController} #editing\n\t\t */\n\t\tthis.editing = this.editor.editing;\n\t}\n\n\t/**\n\t * Handles given mutations.\n\t *\n\t * @param {Array.<module:engine/view/observer/mutationobserver~MutatedText|\n\t * module:engine/view/observer/mutationobserver~MutatedChildren>} mutations\n\t * @param {module:engine/view/selection~Selection|null} viewSelection\n\t */\n\thandle( mutations, viewSelection ) {\n\t\tif ( containerChildrenMutated( mutations ) ) {\n\t\t\tthis._handleContainerChildrenMutations( mutations, viewSelection );\n\t\t} else {\n\t\t\tfor ( const mutation of mutations ) {\n\t\t\t\t// Fortunately it will never be both.\n\t\t\t\tthis._handleTextMutation( mutation, viewSelection );\n\t\t\t\tthis._handleTextNodeInsertion( mutation );\n\t\t\t}\n\t\t}\n\t}\n\n\t/**\n\t * Handles situations when container's children mutated during input. This can happen when\n\t * the browser is trying to \"fix\" DOM in certain situations. For example, when the user starts to type\n\t * in `<p><a href=\"\"><i>Link{}</i></a></p>`, the browser might change the order of elements\n\t * to `<p><i><a href=\"\">Link</a>x{}</i></p>`. A similar situation happens when the spell checker\n\t * replaces a word wrapped with `<strong>` with a word wrapped with a `<b>` element.\n\t *\n\t * To handle such situations, the common DOM ancestor of all mutations is converted to the model representation\n\t * and then compared with the current model to calculate the proper text change.\n\t *\n\t * Note: Single text node insertion is handled in {@link #_handleTextNodeInsertion} and text node mutation is handled\n\t * in {@link #_handleTextMutation}).\n\t *\n\t * @private\n\t * @param {Array.<module:engine/view/observer/mutationobserver~MutatedText|\n\t * module:engine/view/observer/mutationobserver~MutatedChildren>} mutations\n\t * @param {module:engine/view/selection~Selection|null} viewSelection\n\t */\n\t_handleContainerChildrenMutations( mutations, viewSelection ) {\n\t\t// Get common ancestor of all mutations.\n\t\tconst mutationsCommonAncestor = getMutationsContainer( mutations );\n\n\t\t// Quit if there is no common ancestor.\n\t\tif ( !mutationsCommonAncestor ) {\n\t\t\treturn;\n\t\t}\n\n\t\tconst domConverter = this.editor.editing.view.domConverter;\n\n\t\t// Get common ancestor in DOM.\n\t\tconst domMutationCommonAncestor = domConverter.mapViewToDom( mutationsCommonAncestor );\n\n\t\t// Create fresh DomConverter so it will not use existing mapping and convert current DOM to model.\n\t\t// This wouldn't be needed if DomConverter would allow to create fresh view without checking any mappings.\n\t\tconst freshDomConverter = new DomConverter( this.editor.editing.view.document );\n\t\tconst modelFromCurrentDom = this.editor.data.toModel(\n\t\t\tfreshDomConverter.domToView( domMutationCommonAncestor )\n\t\t).getChild( 0 );\n\n\t\t// Current model.\n\t\tconst currentModel = this.editor.editing.mapper.toModelElement( mutationsCommonAncestor );\n\n\t\t// If common ancestor is not mapped, do not do anything. It probably is a parent of another view element.\n\t\t// That means that we would need to diff model elements (see `if` below). Better return early instead of\n\t\t// trying to get a reasonable model ancestor. It will fell into the `if` below anyway.\n\t\t// This situation happens for example for lists. If `<ul>` is a common ancestor, `currentModel` is `undefined`\n\t\t// because `<ul>` is not mapped (`<li>`s are).\n\t\t// See https://github.com/ckeditor/ckeditor5/issues/718.\n\t\tif ( !currentModel ) {\n\t\t\treturn;\n\t\t}\n\n\t\t// Get children from both ancestors.\n\t\tconst modelFromDomChildren = Array.from( modelFromCurrentDom.getChildren() );\n\t\tconst currentModelChildren = Array.from( currentModel.getChildren() );\n\n\t\t// Remove the last `<softBreak>` from the end of `modelFromDomChildren` if there is no `<softBreak>` in current model.\n\t\t// If the described scenario happened, it means that this is a bogus `<br />` added by a browser.\n\t\tconst lastDomChild = modelFromDomChildren[ modelFromDomChildren.length - 1 ];\n\t\tconst lastCurrentChild = currentModelChildren[ currentModelChildren.length - 1 ];\n\n\t\tconst isLastDomChildSoftBreak = lastDomChild && lastDomChild.is( 'element', 'softBreak' );\n\t\tconst isLastCurrentChildSoftBreak = lastCurrentChild && !lastCurrentChild.is( 'element', 'softBreak' );\n\n\t\tif ( isLastDomChildSoftBreak && isLastCurrentChildSoftBreak ) {\n\t\t\tmodelFromDomChildren.pop();\n\t\t}\n\n\t\tconst schema = this.editor.model.schema;\n\n\t\t// Skip situations when common ancestor has any container elements.\n\t\tif ( !isSafeForTextMutation( modelFromDomChildren, schema ) || !isSafeForTextMutation( currentModelChildren, schema ) ) {\n\t\t\treturn;\n\t\t}\n\n\t\t// Replace &nbsp; inserted by the browser with normal space. See comment in `_handleTextMutation`.\n\t\t// Replace non-texts with any character. This is potentially dangerous but passes in manual tests. The thing is\n\t\t// that we need to take care of proper indexes so we cannot simply remove non-text elements from the content.\n\t\t// By inserting a character we keep all the real texts on their indexes.\n\t\tconst newText = modelFromDomChildren.map( item => item.is( '$text' ) ? item.data : '@' ).join( '' ).replace( /\\u00A0/g, ' ' );\n\t\tconst oldText = currentModelChildren.map( item => item.is( '$text' ) ? item.data : '@' ).join( '' ).replace( /\\u00A0/g, ' ' );\n\n\t\t// Do nothing if mutations created same text.\n\t\tif ( oldText === newText ) {\n\t\t\treturn;\n\t\t}\n\n\t\tconst diffResult = diff( oldText, newText );\n\n\t\tconst { firstChangeAt, insertions, deletions } = calculateChanges( diffResult );\n\n\t\t// Try setting new model selection according to passed view selection.\n\t\tlet modelSelectionRange = null;\n\n\t\tif ( viewSelection ) {\n\t\t\tmodelSelectionRange = this.editing.mapper.toModelRange( viewSelection.getFirstRange() );\n\t\t}\n\n\t\tconst insertText = newText.substr( firstChangeAt, insertions );\n\t\tconst removeRange = this.editor.model.createRange(\n\t\t\tthis.editor.model.createPositionAt( currentModel, firstChangeAt ),\n\t\t\tthis.editor.model.createPositionAt( currentModel, firstChangeAt + deletions )\n\t\t);\n\n\t\tthis.editor.execute( 'input', {\n\t\t\ttext: insertText,\n\t\t\trange: removeRange,\n\t\t\tresultRange: modelSelectionRange\n\t\t} );\n\t}\n\n\t/**\n\t * @private\n\t */\n\t_handleTextMutation( mutation, viewSelection ) {\n\t\tif ( mutation.type != 'text' ) {\n\t\t\treturn;\n\t\t}\n\n\t\t// Replace &nbsp; inserted by the browser with normal space.\n\t\t// We want only normal spaces in the model and in the view. Renderer and DOM Converter will be then responsible\n\t\t// for rendering consecutive spaces using &nbsp;, but the model and the view has to be clear.\n\t\t// Other feature may introduce inserting non-breakable space on specific key stroke (for example shift + space).\n\t\t// However then it will be handled outside of mutations, like enter key is.\n\t\t// The replacing is here because it has to be done before `diff` and `diffToChanges` functions, as they\n\t\t// take `newText` and compare it to (cleaned up) view.\n\t\t// It could also be done in mutation observer too, however if any outside plugin would like to\n\t\t// introduce additional events for mutations, they would get already cleaned up version (this may be good or not).\n\t\tconst newText = mutation.newText.replace( /\\u00A0/g, ' ' );\n\t\t// To have correct `diffResult`, we also compare view node text data with &nbsp; replaced by space.\n\t\tconst oldText = mutation.oldText.replace( /\\u00A0/g, ' ' );\n\n\t\t// Do nothing if mutations created same text.\n\t\tif ( oldText === newText ) {\n\t\t\treturn;\n\t\t}\n\n\t\tconst diffResult = diff( oldText, newText );\n\n\t\tconst { firstChangeAt, insertions, deletions } = calculateChanges( diffResult );\n\n\t\t// Try setting new model selection according to passed view selection.\n\t\tlet modelSelectionRange = null;\n\n\t\tif ( viewSelection ) {\n\t\t\tmodelSelectionRange = this.editing.mapper.toModelRange( viewSelection.getFirstRange() );\n\t\t}\n\n\t\t// Get the position in view and model where the changes will happen.\n\t\tconst viewPos = this.editing.view.createPositionAt( mutation.node, firstChangeAt );\n\t\tconst modelPos = this.editing.mapper.toModelPosition( viewPos );\n\t\tconst removeRange = this.editor.model.createRange( modelPos, modelPos.getShiftedBy( deletions ) );\n\t\tconst insertText = newText.substr( firstChangeAt, insertions );\n\n\t\tthis.editor.execute( 'input', {\n\t\t\ttext: insertText,\n\t\t\trange: removeRange,\n\t\t\tresultRange: modelSelectionRange\n\t\t} );\n\t}\n\n\t/**\n\t * @private\n\t */\n\t_handleTextNodeInsertion( mutation ) {\n\t\tif ( mutation.type != 'children' ) {\n\t\t\treturn;\n\t\t}\n\n\t\tconst change = getSingleTextNodeChange( mutation );\n\t\tconst viewPos = this.editing.view.createPositionAt( mutation.node, change.index );\n\t\tconst modelPos = this.editing.mapper.toModelPosition( viewPos );\n\t\tconst insertedText = change.values[ 0 ].data;\n\n\t\tthis.editor.execute( 'input', {\n\t\t\t// Replace &nbsp; inserted by the browser with normal space.\n\t\t\t// See comment in `_handleTextMutation`.\n\t\t\t// In this case we don't need to do this before `diff` because we diff whole nodes.\n\t\t\t// Just change &nbsp; in case there are some.\n\t\t\ttext: insertedText.replace( /\\u00A0/g, ' ' ),\n\t\t\trange: this.editor.model.createRange( modelPos )\n\t\t} );\n\t}\n}\n\n// Returns first common ancestor of all mutations that is either {@link module:engine/view/containerelement~ContainerElement}\n// or {@link module:engine/view/rootelement~RootElement}.\n//\n// @private\n// @param {Array.<module:engine/view/observer/mutationobserver~MutatedText|\n// module:engine/view/observer/mutationobserver~MutatedChildren>} mutations\n// @returns {module:engine/view/containerelement~ContainerElement|engine/view/rootelement~RootElement|undefined}\nfunction getMutationsContainer( mutations ) {\n\tconst lca = mutations\n\t\t.map( mutation => mutation.node )\n\t\t.reduce( ( commonAncestor, node ) => {\n\t\t\treturn commonAncestor.getCommonAncestor( node, { includeSelf: true } );\n\t\t} );\n\n\tif ( !lca ) {\n\t\treturn;\n\t}\n\n\t// We need to look for container and root elements only, so check all LCA's\n\t// ancestors (starting from itself).\n\treturn lca.getAncestors( { includeSelf: true, parentFirst: true } )\n\t\t.find( element => element.is( 'containerElement' ) || element.is( 'rootElement' ) );\n}\n\n// Returns true if provided array contains content that won't be problematic during diffing and text mutation handling.\n//\n// @param {Array.<module:engine/model/node~Node>} children\n// @param {module:engine/model/schema~Schema} schema\n// @returns {Boolean}\nfunction isSafeForTextMutation( children, schema ) {\n\treturn children.every( child => schema.isInline( child ) );\n}\n\n// Calculates first change index and number of characters that should be inserted and deleted starting from that index.\n//\n// @private\n// @param diffResult\n// @returns {{insertions: number, deletions: number, firstChangeAt: *}}\nfunction calculateChanges( diffResult ) {\n\t// Index where the first change happens. Used to set the position from which nodes will be removed and where will be inserted.\n\tlet firstChangeAt = null;\n\t// Index where the last change happens. Used to properly count how many characters have to be removed and inserted.\n\tlet lastChangeAt = null;\n\n\t// Get `firstChangeAt` and `lastChangeAt`.\n\tfor ( let i = 0; i < diffResult.length; i++ ) {\n\t\tconst change = diffResult[ i ];\n\n\t\tif ( change != 'equal' ) {\n\t\t\tfirstChangeAt = firstChangeAt === null ? i : firstChangeAt;\n\t\t\tlastChangeAt = i;\n\t\t}\n\t}\n\n\t// How many characters, starting from `firstChangeAt`, should be removed.\n\tlet deletions = 0;\n\t// How many characters, starting from `firstChangeAt`, should be inserted.\n\tlet insertions = 0;\n\n\tfor ( let i = firstChangeAt; i <= lastChangeAt; i++ ) {\n\t\t// If there is no change (equal) or delete, the character is existing in `oldText`. We count it for removing.\n\t\tif ( diffResult[ i ] != 'insert' ) {\n\t\t\tdeletions++;\n\t\t}\n\n\t\t// If there is no change (equal) or insert, the character is existing in `newText`. We count it for inserting.\n\t\tif ( diffResult[ i ] != 'delete' ) {\n\t\t\tinsertions++;\n\t\t}\n\t}\n\n\treturn { insertions, deletions, firstChangeAt };\n}\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module typing/input\n */\n\nimport Plugin from '@ckeditor/ckeditor5-core/src/plugin';\nimport InputCommand from './inputcommand';\n\nimport injectUnsafeKeystrokesHandling from './utils/injectunsafekeystrokeshandling';\nimport injectTypingMutationsHandling from './utils/injecttypingmutationshandling';\n\n/**\n * Handles text input coming from the keyboard or other input methods.\n *\n * @extends module:core/plugin~Plugin\n */\nexport default class Input extends Plugin {\n\t/**\n\t * @inheritDoc\n\t */\n\tstatic get pluginName() {\n\t\treturn 'Input';\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tinit() {\n\t\tconst editor = this.editor;\n\n\t\t// TODO The above default configuration value should be defined using editor.config.define() once it's fixed.\n\t\tconst inputCommand = new InputCommand( editor, editor.config.get( 'typing.undoStep' ) || 20 );\n\n\t\teditor.commands.add( 'input', inputCommand );\n\n\t\tinjectUnsafeKeystrokesHandling( editor );\n\t\tinjectTypingMutationsHandling( editor );\n\t}\n\n\t/**\n\t * Checks batch if it is a result of user input - e.g. typing.\n\t *\n\t *\t\tconst input = editor.plugins.get( 'Input' );\n\t *\n\t *\t\teditor.model.document.on( 'change:data', ( evt, batch ) => {\n\t *\t\t\tif ( input.isInput( batch ) ) {\n\t *\t\t\t\tconsole.log( 'The user typed something...' );\n\t *\t\t\t}\n\t *\t\t} );\n\t *\n\t * **Note:** This method checks if the batch was created using {@link module:typing/inputcommand~InputCommand 'input'}\n\t * command as typing changes coming from user input are inserted to the document using that command.\n\t *\n\t * @param {module:engine/model/batch~Batch} batch A batch to check.\n\t * @returns {Boolean}\n\t */\n\tisInput( batch ) {\n\t\tconst inputCommand = this.editor.commands.get( 'input' );\n\n\t\treturn inputCommand._batches.has( batch );\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module typing/deletecommand\n */\n\nimport Command from '@ckeditor/ckeditor5-core/src/command';\nimport count from '@ckeditor/ckeditor5-utils/src/count';\n\nimport ChangeBuffer from './utils/changebuffer';\n\n/**\n * The delete command. Used by the {@link module:typing/delete~Delete delete feature} to handle the <kbd>Delete</kbd> and\n * <kbd>Backspace</kbd> keys.\n *\n * @extends module:core/command~Command\n */\nexport default class DeleteCommand extends Command {\n\t/**\n\t * Creates an instance of the command.\n\t *\n\t * @param {module:core/editor/editor~Editor} editor\n\t * @param {'forward'|'backward'} direction The directionality of the delete describing in what direction it\n\t * should consume the content when the selection is collapsed.\n\t */\n\tconstructor( editor, direction ) {\n\t\tsuper( editor );\n\n\t\t/**\n\t\t * The directionality of the delete describing in what direction it should\n\t\t * consume the content when the selection is collapsed.\n\t\t *\n\t\t * @readonly\n\t\t * @member {'forward'|'backward'} #direction\n\t\t */\n\t\tthis.direction = direction;\n\n\t\t/**\n\t\t * Delete's change buffer used to group subsequent changes into batches.\n\t\t *\n\t\t * @readonly\n\t\t * @private\n\t\t * @type {module:typing/utils/changebuffer~ChangeBuffer}\n\t\t */\n\t\tthis._buffer = new ChangeBuffer( editor.model, editor.config.get( 'typing.undoStep' ) );\n\t}\n\n\t/**\n\t * The current change buffer.\n\t *\n\t * @type {module:typing/utils/changebuffer~ChangeBuffer}\n\t */\n\tget buffer() {\n\t\treturn this._buffer;\n\t}\n\n\t/**\n\t * Executes the delete command. Depending on whether the selection is collapsed or not, deletes its content\n\t * or a piece of content in the {@link #direction defined direction}.\n\t *\n\t * @fires execute\n\t * @param {Object} [options] The command options.\n\t * @param {'character'} [options.unit='character'] See {@link module:engine/model/utils/modifyselection~modifySelection}'s options.\n\t * @param {Number} [options.sequence=1] A number describing which subsequent delete event it is without the key being released.\n\t * See the {@link module:engine/view/document~Document#event:delete} event data.\n\t * @param {module:engine/model/selection~Selection} [options.selection] Selection to remove. If not set, current model selection\n\t * will be used.\n\t */\n\texecute( options = {} ) {\n\t\tconst model = this.editor.model;\n\t\tconst doc = model.document;\n\n\t\tmodel.enqueueChange( this._buffer.batch, writer => {\n\t\t\tthis._buffer.lock();\n\n\t\t\tconst selection = writer.createSelection( options.selection || doc.selection );\n\n\t\t\t// Do not replace the whole selected content if selection was collapsed.\n\t\t\t// This prevents such situation:\n\t\t\t//\n\t\t\t// <h1></h1><p>[]</p>\t-->  <h1>[</h1><p>]</p> \t\t-->  <p></p>\n\t\t\t// starting content\t\t-->   after `modifySelection`\t-->  after `deleteContent`.\n\t\t\tconst doNotResetEntireContent = selection.isCollapsed;\n\n\t\t\t// Try to extend the selection in the specified direction.\n\t\t\tif ( selection.isCollapsed ) {\n\t\t\t\tmodel.modifySelection( selection, { direction: this.direction, unit: options.unit } );\n\t\t\t}\n\n\t\t\t// Check if deleting in an empty editor. See #61.\n\t\t\tif ( this._shouldEntireContentBeReplacedWithParagraph( options.sequence || 1 ) ) {\n\t\t\t\tthis._replaceEntireContentWithParagraph( writer );\n\n\t\t\t\treturn;\n\t\t\t}\n\n\t\t\t// If selection is still collapsed, then there's nothing to delete.\n\t\t\tif ( selection.isCollapsed ) {\n\t\t\t\treturn;\n\t\t\t}\n\n\t\t\tlet changeCount = 0;\n\n\t\t\tselection.getFirstRange().getMinimalFlatRanges().forEach( range => {\n\t\t\t\tchangeCount += count(\n\t\t\t\t\trange.getWalker( { singleCharacters: true, ignoreElementEnd: true, shallow: true } )\n\t\t\t\t);\n\t\t\t} );\n\n\t\t\tmodel.deleteContent( selection, {\n\t\t\t\tdoNotResetEntireContent,\n\t\t\t\tdirection: this.direction\n\t\t\t} );\n\n\t\t\tthis._buffer.input( changeCount );\n\n\t\t\twriter.setSelection( selection );\n\n\t\t\tthis._buffer.unlock();\n\t\t} );\n\t}\n\n\t/**\n\t * If the user keeps <kbd>Backspace</kbd> or <kbd>Delete</kbd> key pressed, the content of the current\n\t * editable will be cleared. However, this will not yet lead to resetting the remaining block to a paragraph\n\t * (which happens e.g. when the user does <kbd>Ctrl</kbd> + <kbd>A</kbd>, <kbd>Backspace</kbd>).\n\t *\n\t * But, if the user pressed the key in an empty editable for the first time,\n\t * we want to replace the entire content with a paragraph if:\n\t *\n\t * * the current limit element is empty,\n\t * * the paragraph is allowed in the limit element,\n\t * * the limit doesn't already have a paragraph inside.\n\t *\n\t * See https://github.com/ckeditor/ckeditor5-typing/issues/61.\n\t *\n\t * @private\n\t * @param {Number} sequence A number describing which subsequent delete event it is without the key being released.\n\t * @returns {Boolean}\n\t */\n\t_shouldEntireContentBeReplacedWithParagraph( sequence ) {\n\t\t// Does nothing if user pressed and held the \"Backspace\" or \"Delete\" key.\n\t\tif ( sequence > 1 ) {\n\t\t\treturn false;\n\t\t}\n\n\t\tconst model = this.editor.model;\n\t\tconst doc = model.document;\n\t\tconst selection = doc.selection;\n\t\tconst limitElement = model.schema.getLimitElement( selection );\n\n\t\t// If a collapsed selection contains the whole content it means that the content is empty\n\t\t// (from the user perspective).\n\t\tconst limitElementIsEmpty = selection.isCollapsed && selection.containsEntireContent( limitElement );\n\n\t\tif ( !limitElementIsEmpty ) {\n\t\t\treturn false;\n\t\t}\n\n\t\tif ( !model.schema.checkChild( limitElement, 'paragraph' ) ) {\n\t\t\treturn false;\n\t\t}\n\n\t\tconst limitElementFirstChild = limitElement.getChild( 0 );\n\n\t\t// Does nothing if the limit element already contains only a paragraph.\n\t\t// We ignore the case when paragraph might have some inline elements (<p><inlineWidget>[]</inlineWidget></p>)\n\t\t// because we don't support such cases yet and it's unclear whether inlineWidget shouldn't be a limit itself.\n\t\tif ( limitElementFirstChild && limitElementFirstChild.name === 'paragraph' ) {\n\t\t\treturn false;\n\t\t}\n\n\t\treturn true;\n\t}\n\n\t/**\n\t * The entire content is replaced with the paragraph. Selection is moved inside the paragraph.\n\t *\n\t * @private\n\t */\n\t_replaceEntireContentWithParagraph( writer ) {\n\t\tconst model = this.editor.model;\n\t\tconst doc = model.document;\n\t\tconst selection = doc.selection;\n\t\tconst limitElement = model.schema.getLimitElement( selection );\n\t\tconst paragraph = writer.createElement( 'paragraph' );\n\n\t\twriter.remove( writer.createRangeIn( limitElement ) );\n\t\twriter.insert( paragraph, limitElement );\n\n\t\twriter.setSelection( paragraph, 0 );\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module typing/deleteobserver\n */\n\nimport Observer from '@ckeditor/ckeditor5-engine/src/view/observer/observer';\nimport DomEventData from '@ckeditor/ckeditor5-engine/src/view/observer/domeventdata';\nimport { keyCodes } from '@ckeditor/ckeditor5-utils/src/keyboard';\nimport env from '@ckeditor/ckeditor5-utils/src/env';\n\n/**\n * Delete observer introduces the {@link module:engine/view/document~Document#event:delete} event.\n *\n * @extends module:engine/view/observer/observer~Observer\n */\nexport default class DeleteObserver extends Observer {\n\tconstructor( view ) {\n\t\tsuper( view );\n\n\t\tconst document = view.document;\n\t\tlet sequence = 0;\n\n\t\tdocument.on( 'keyup', ( evt, data ) => {\n\t\t\tif ( data.keyCode == keyCodes.delete || data.keyCode == keyCodes.backspace ) {\n\t\t\t\tsequence = 0;\n\t\t\t}\n\t\t} );\n\n\t\tdocument.on( 'keydown', ( evt, data ) => {\n\t\t\tconst deleteData = {};\n\n\t\t\tif ( data.keyCode == keyCodes.delete ) {\n\t\t\t\tdeleteData.direction = 'forward';\n\t\t\t\tdeleteData.unit = 'character';\n\t\t\t} else if ( data.keyCode == keyCodes.backspace ) {\n\t\t\t\tdeleteData.direction = 'backward';\n\t\t\t\tdeleteData.unit = 'codePoint';\n\t\t\t} else {\n\t\t\t\treturn;\n\t\t\t}\n\n\t\t\tconst hasWordModifier = env.isMac ? data.altKey : data.ctrlKey;\n\t\t\tdeleteData.unit = hasWordModifier ? 'word' : deleteData.unit;\n\t\t\tdeleteData.sequence = ++sequence;\n\n\t\t\tfireViewDeleteEvent( evt, data.domEvent, deleteData );\n\t\t} );\n\n\t\t// `beforeinput` is handled only for Android devices. Desktop Chrome and iOS are skipped because they are working fine now.\n\t\tif ( env.isAndroid ) {\n\t\t\tdocument.on( 'beforeinput', ( evt, data ) => {\n\t\t\t\t// If event type is other than `deleteContentBackward` then this is not deleting.\n\t\t\t\tif ( data.domEvent.inputType != 'deleteContentBackward' ) {\n\t\t\t\t\treturn;\n\t\t\t\t}\n\n\t\t\t\tconst deleteData = {\n\t\t\t\t\tunit: 'codepoint',\n\t\t\t\t\tdirection: 'backward',\n\t\t\t\t\tsequence: 1\n\t\t\t\t};\n\n\t\t\t\t// Android IMEs may change the DOM selection on `beforeinput` event so that the selection contains all the text\n\t\t\t\t// that the IME wants to remove. We will pass this information to `delete` event so proper part of the content is removed.\n\t\t\t\t//\n\t\t\t\t// Sometimes it is only expanding by a one character (in case of collapsed selection). In this case we don't need to\n\t\t\t\t// set a different selection to remove, it will work just fine.\n\t\t\t\tconst domSelection = data.domTarget.ownerDocument.defaultView.getSelection();\n\n\t\t\t\tif ( domSelection.anchorNode == domSelection.focusNode && domSelection.anchorOffset + 1 != domSelection.focusOffset ) {\n\t\t\t\t\tdeleteData.selectionToRemove = view.domConverter.domSelectionToView( domSelection );\n\t\t\t\t}\n\n\t\t\t\tfireViewDeleteEvent( evt, data.domEvent, deleteData );\n\t\t\t} );\n\t\t}\n\n\t\tfunction fireViewDeleteEvent( originalEvent, domEvent, deleteData ) {\n\t\t\t// Save the event object to check later if it was stopped or not.\n\t\t\tlet event;\n\t\t\tdocument.once( 'delete', evt => ( event = evt ), { priority: Number.POSITIVE_INFINITY } );\n\n\t\t\tdocument.fire( 'delete', new DomEventData( document, domEvent, deleteData ) );\n\n\t\t\t// Stop the original event if `delete` event was stopped.\n\t\t\t// https://github.com/ckeditor/ckeditor5/issues/753\n\t\t\tif ( event && event.stop.called ) {\n\t\t\t\toriginalEvent.stop();\n\t\t\t}\n\t\t}\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tobserve() {}\n}\n\n/**\n * Event fired when the user tries to delete content (e.g. presses <kbd>Delete</kbd> or <kbd>Backspace</kbd>).\n *\n * Note: This event is fired by the {@link module:typing/deleteobserver~DeleteObserver observer}\n * (usually registered by the {@link module:typing/delete~Delete delete feature}).\n *\n * @event module:engine/view/document~Document#event:delete\n * @param {module:engine/view/observer/domeventdata~DomEventData} data\n * @param {'forward'|'delete'} data.direction The direction in which the deletion should happen.\n * @param {'character'|'word'} data.unit The \"amount\" of content that should be deleted.\n * @param {Number} data.sequence A number describing which subsequent delete event it is without the key being released.\n * If it's 2 or more it means that the key was pressed and hold.\n * @param {module:engine/view/selection~Selection} [data.selectionToRemove] View selection which content should be removed. If not set,\n * current selection should be used.\n */\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module typing/delete\n */\n\nimport Plugin from '@ckeditor/ckeditor5-core/src/plugin';\nimport DeleteCommand from './deletecommand';\nimport DeleteObserver from './deleteobserver';\nimport env from '@ckeditor/ckeditor5-utils/src/env';\n\n/**\n * The delete and backspace feature. Handles the <kbd>Delete</kbd> and <kbd>Backspace</kbd> keys in the editor.\n *\n * @extends module:core/plugin~Plugin\n */\nexport default class Delete extends Plugin {\n\t/**\n\t * @inheritDoc\n\t */\n\tstatic get pluginName() {\n\t\treturn 'Delete';\n\t}\n\n\tinit() {\n\t\tconst editor = this.editor;\n\t\tconst view = editor.editing.view;\n\t\tconst viewDocument = view.document;\n\n\t\tview.addObserver( DeleteObserver );\n\n\t\teditor.commands.add( 'forwardDelete', new DeleteCommand( editor, 'forward' ) );\n\t\teditor.commands.add( 'delete', new DeleteCommand( editor, 'backward' ) );\n\n\t\tthis.listenTo( viewDocument, 'delete', ( evt, data ) => {\n\t\t\tconst deleteCommandParams = { unit: data.unit, sequence: data.sequence };\n\n\t\t\t// If a specific (view) selection to remove was set, convert it to a model selection and set as a parameter for `DeleteCommand`.\n\t\t\tif ( data.selectionToRemove ) {\n\t\t\t\tconst modelSelection = editor.model.createSelection();\n\t\t\t\tconst ranges = [];\n\n\t\t\t\tfor ( const viewRange of data.selectionToRemove.getRanges() ) {\n\t\t\t\t\tranges.push( editor.editing.mapper.toModelRange( viewRange ) );\n\t\t\t\t}\n\n\t\t\t\tmodelSelection.setTo( ranges );\n\n\t\t\t\tdeleteCommandParams.selection = modelSelection;\n\t\t\t}\n\n\t\t\teditor.execute( data.direction == 'forward' ? 'forwardDelete' : 'delete', deleteCommandParams );\n\n\t\t\tdata.preventDefault();\n\n\t\t\tview.scrollToTheSelection();\n\t\t} );\n\n\t\t// Android IMEs have a quirk - they change DOM selection after the input changes were performed by the browser.\n\t\t// This happens on `keyup` event. Android doesn't know anything about our deletion and selection handling. Even if the selection\n\t\t// was changed during input events, IME remembers the position where the selection \"should\" be placed and moves it there.\n\t\t//\n\t\t// To prevent incorrect selection, we save the selection after deleting here and then re-set it on `keyup`. This has to be done\n\t\t// on DOM selection level, because on `keyup` the model selection is still the same as it was just after deletion, so it\n\t\t// wouldn't be changed and the fix would do nothing.\n\t\t//\n\t\tif ( env.isAndroid ) {\n\t\t\tlet domSelectionAfterDeletion = null;\n\n\t\t\tthis.listenTo( viewDocument, 'delete', ( evt, data ) => {\n\t\t\t\tconst domSelection = data.domTarget.ownerDocument.defaultView.getSelection();\n\n\t\t\t\tdomSelectionAfterDeletion = {\n\t\t\t\t\tanchorNode: domSelection.anchorNode,\n\t\t\t\t\tanchorOffset: domSelection.anchorOffset,\n\t\t\t\t\tfocusNode: domSelection.focusNode,\n\t\t\t\t\tfocusOffset: domSelection.focusOffset\n\t\t\t\t};\n\t\t\t}, { priority: 'lowest' } );\n\n\t\t\tthis.listenTo( viewDocument, 'keyup', ( evt, data ) => {\n\t\t\t\tif ( domSelectionAfterDeletion ) {\n\t\t\t\t\tconst domSelection = data.domTarget.ownerDocument.defaultView.getSelection();\n\n\t\t\t\t\tdomSelection.collapse( domSelectionAfterDeletion.anchorNode, domSelectionAfterDeletion.anchorOffset );\n\t\t\t\t\tdomSelection.extend( domSelectionAfterDeletion.focusNode, domSelectionAfterDeletion.focusOffset );\n\n\t\t\t\t\tdomSelectionAfterDeletion = null;\n\t\t\t\t}\n\t\t\t} );\n\t\t}\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module typing/typing\n */\n\nimport Plugin from '@ckeditor/ckeditor5-core/src/plugin';\nimport Input from './input';\nimport Delete from './delete';\n\n/**\n * The typing feature. It handles typing.\n *\n * This is a \"glue\" plugin which loads the {@link module:typing/input~Input} and {@link module:typing/delete~Delete}\n * plugins.\n *\n * @extends module:core/plugin~Plugin\n */\nexport default class Typing extends Plugin {\n\tstatic get requires() {\n\t\treturn [ Input, Delete ];\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tstatic get pluginName() {\n\t\treturn 'Typing';\n\t}\n}\n\n/**\n * The configuration of the typing features. Used by the features from the `@ckeditor/ckeditor5-typing` package.\n *\n * Read more in {@link module:typing/typing~TypingConfig}.\n *\n * @member {module:typing/typing~TypingConfig} module:core/editor/editorconfig~EditorConfig#typing\n */\n\n/**\n * The configuration of the typing features. Used by the typing features in `@ckeditor/ckeditor5-typing` package.\n *\n *\t\tClassicEditor\n *\t\t\t.create( editorElement, {\n * \t\t\t\ttyping: ... // Typing feature options.\n *\t\t\t} )\n *\t\t\t.then( ... )\n *\t\t\t.catch( ... );\n *\n * See {@link module:core/editor/editorconfig~EditorConfig all editor options}.\n *\n * @interface TypingConfig\n */\n\n/**\n * The granularity of undo/redo for typing and deleting. The value `20` means (more or less) that a new undo step\n * is created every 20 characters are inserted or deleted.\n *\n * @member {Number} [module:typing/typing~TypingConfig#undoStep=20]\n */\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\nimport InsertOperation from './insertoperation';\nimport AttributeOperation from './attributeoperation';\nimport RenameOperation from './renameoperation';\nimport MarkerOperation from './markeroperation';\nimport MoveOperation from './moveoperation';\nimport RootAttributeOperation from './rootattributeoperation';\nimport MergeOperation from './mergeoperation';\nimport SplitOperation from './splitoperation';\nimport NoOperation from './nooperation';\nimport Range from '../range';\nimport Position from '../position';\n\nimport compareArrays from '@ckeditor/ckeditor5-utils/src/comparearrays';\n\nconst transformations = new Map();\n\n/**\n * @module engine/model/operation/transform\n */\n\n/**\n * Sets a transformation function to be be used to transform instances of class `OperationA` by instances of class `OperationB`.\n *\n * The `transformationFunction` is passed three parameters:\n *\n * * `a` - operation to be transformed, an instance of `OperationA`,\n * * `b` - operation to be transformed by, an instance of `OperationB`,\n * * {@link module:engine/model/operation/transform~TransformationContext `context`} - object with additional information about\n * transformation context.\n *\n * The `transformationFunction` should return transformation result, which is an array with one or multiple\n * {@link module:engine/model/operation/operation~Operation operation} instances.\n *\n * @protected\n * @param {Function} OperationA\n * @param {Function} OperationB\n * @param {Function} transformationFunction Function to use for transforming.\n */\nfunction setTransformation( OperationA, OperationB, transformationFunction ) {\n\tlet aGroup = transformations.get( OperationA );\n\n\tif ( !aGroup ) {\n\t\taGroup = new Map();\n\t\ttransformations.set( OperationA, aGroup );\n\t}\n\n\taGroup.set( OperationB, transformationFunction );\n}\n\n/**\n * Returns a previously set transformation function for transforming an instance of `OperationA` by an instance of `OperationB`.\n *\n * If no transformation was set for given pair of operations, {@link module:engine/model/operation/transform~noUpdateTransformation}\n * is returned. This means that if no transformation was set, the `OperationA` instance will not change when transformed\n * by the `OperationB` instance.\n *\n * @private\n * @param {Function} OperationA\n * @param {Function} OperationB\n * @returns {Function} Function set to transform an instance of `OperationA` by an instance of `OperationB`.\n */\nfunction getTransformation( OperationA, OperationB ) {\n\tconst aGroup = transformations.get( OperationA );\n\n\tif ( aGroup && aGroup.has( OperationB ) ) {\n\t\treturn aGroup.get( OperationB );\n\t}\n\n\treturn noUpdateTransformation;\n}\n\n/**\n * A transformation function that only clones operation to transform, without changing it.\n *\n * @private\n * @param {module:engine/model/operation/operation~Operation} a Operation to transform.\n * @returns {Array.<module:engine/model/operation/operation~Operation>}\n */\nfunction noUpdateTransformation( a ) {\n\treturn [ a ];\n}\n\n/**\n * Transforms operation `a` by operation `b`.\n *\n * @param {module:engine/model/operation/operation~Operation} a Operation to be transformed.\n * @param {module:engine/model/operation/operation~Operation} b Operation to transform by.\n * @param {module:engine/model/operation/transform~TransformationContext} context Transformation context for this transformation.\n * @returns {Array.<module:engine/model/operation/operation~Operation>} Transformation result.\n */\nexport function transform( a, b, context = {} ) {\n\tconst transformationFunction = getTransformation( a.constructor, b.constructor );\n\n\t/* eslint-disable no-useless-catch */\n\ttry {\n\t\ta = a.clone();\n\n\t\treturn transformationFunction( a, b, context );\n\t} catch ( e ) {\n\t\t// @if CK_DEBUG // console.warn( 'Error during operation transformation!', e.message );\n\t\t// @if CK_DEBUG // console.warn( 'Transformed operation', a );\n\t\t// @if CK_DEBUG // console.warn( 'Operation transformed by', b );\n\t\t// @if CK_DEBUG // console.warn( 'context.aIsStrong', context.aIsStrong );\n\t\t// @if CK_DEBUG // console.warn( 'context.aWasUndone', context.aWasUndone );\n\t\t// @if CK_DEBUG // console.warn( 'context.bWasUndone', context.bWasUndone );\n\t\t// @if CK_DEBUG // console.warn( 'context.abRelation', context.abRelation );\n\t\t// @if CK_DEBUG // console.warn( 'context.baRelation', context.baRelation );\n\n\t\tthrow e;\n\t}\n\t/* eslint-enable no-useless-catch */\n}\n\n/**\n * Performs a transformation of two sets of operations - `operationsA` and `operationsB`. The transformation is two-way -\n * both transformed `operationsA` and transformed `operationsB` are returned.\n *\n * Note, that the first operation in each set should base on the same document state (\n * {@link module:engine/model/document~Document#version document version}).\n *\n * It is assumed that `operationsA` are \"more important\" during conflict resolution between two operations.\n *\n * New copies of both passed arrays and operations inside them are returned. Passed arguments are not altered.\n *\n * Base versions of the transformed operations sets are updated accordingly. For example, assume that base versions are `4`\n * and there are `3` operations in `operationsA` and `5` operations in `operationsB`. Then:\n *\n * * transformed `operationsA` will start from base version `9` (`4` base version + `5` operations B),\n * * transformed `operationsB` will start from base version `7` (`4` base version + `3` operations A).\n *\n * If no operation was broken into two during transformation, then both sets will end up with an operation that bases on version `11`:\n *\n * * transformed `operationsA` start from `9` and there are `3` of them, so the last will have `baseVersion` equal to `11`,\n * * transformed `operationsB` start from `7` and there are `5` of them, so the last will have `baseVersion` equal to `11`.\n *\n * @param {Array.<module:engine/model/operation/operation~Operation>} operationsA\n * @param {Array.<module:engine/model/operation/operation~Operation>} operationsB\n * @param {Object} options Additional transformation options.\n * @param {module:engine/model/document~Document|null} options.document Document which the operations change.\n * @param {Boolean} [options.useRelations=false] Whether during transformation relations should be used (used during undo for\n * better conflict resolution).\n * @param {Boolean} [options.padWithNoOps=false] Whether additional {@link module:engine/model/operation/nooperation~NoOperation}s\n * should be added to the transformation results to force the same last base version for both transformed sets (in case\n * if some operations got broken into multiple operations during transformation).\n * @returns {Object} Transformation result.\n * @returns {Array.<module:engine/model/operation/operation~Operation>} return.operationsA Transformed `operationsA`.\n * @returns {Array.<module:engine/model/operation/operation~Operation>} return.operationsB Transformed `operationsB`.\n * @returns {Map} return.originalOperations A map that links transformed operations to original operations. The keys are the transformed\n * operations and the values are the original operations from the input (`operationsA` and `operationsB`).\n */\nexport function transformSets( operationsA, operationsB, options ) {\n\t// Create new arrays so the originally passed arguments are not changed.\n\t// No need to clone operations, they are cloned as they are transformed.\n\toperationsA = operationsA.slice();\n\toperationsB = operationsB.slice();\n\n\tconst contextFactory = new ContextFactory( options.document, options.useRelations, options.forceWeakRemove );\n\tcontextFactory.setOriginalOperations( operationsA );\n\tcontextFactory.setOriginalOperations( operationsB );\n\n\tconst originalOperations = contextFactory.originalOperations;\n\n\t// If one of sets is empty there is simply nothing to transform, so return sets as they are.\n\tif ( operationsA.length == 0 || operationsB.length == 0 ) {\n\t\treturn { operationsA, operationsB, originalOperations };\n\t}\n\t//\n\t// Following is a description of transformation process:\n\t//\n\t// There are `operationsA` and `operationsB` to be transformed, both by both.\n\t//\n\t// So, suppose we have sets of two operations each: `operationsA` = `[ a1, a2 ]`, `operationsB` = `[ b1, b2 ]`.\n\t//\n\t// Remember, that we can only transform operations that base on the same context. We assert that `a1` and `b1` base on\n\t// the same context and we transform them. Then, we get `a1'` and `b1'`. `a2` bases on a context with `a1` -- `a2`\n\t// is an operation that followed `a1`. Similarly, `b2` bases on a context with `b1`.\n\t//\n\t// However, since `a1'` is a result of transformation by `b1`, `a1'` now also has a context with `b1`. This means that\n\t// we can safely transform `a1'` by `b2`. As we finish transforming `a1`, we also transformed all `operationsB`.\n\t// All `operationsB` also have context including `a1`. Now, we can properly transform `a2` by those operations.\n\t//\n\t// The transformation process can be visualized on a transformation diagram (\"diamond diagram\"):\n\t//\n\t//          [the initial state]\n\t//         [common for a1 and b1]\n\t//\n\t//                   *\n\t//                  / \\\n\t//                 /   \\\n\t//               b1     a1\n\t//               /       \\\n\t//              /         \\\n\t//             *           *\n\t//            / \\         / \\\n\t//           /   \\       /   \\\n\t//         b2    a1'   b1'    a2\n\t//         /       \\   /       \\\n\t//        /         \\ /         \\\n\t//       *           *           *\n\t//        \\         / \\         /\n\t//         \\       /   \\       /\n\t//        a1''   b2'   a2'   b1''\n\t//           \\   /       \\   /\n\t//            \\ /         \\ /\n\t//             *           *\n\t//              \\         /\n\t//               \\       /\n\t//              a2''   b2''\n\t//                 \\   /\n\t//                  \\ /\n\t//                   *\n\t//\n\t//           [the final state]\n\t//\n\t// The final state can be reached from the initial state by applying `a1`, `a2`, `b1''` and `b2''`, as well as by\n\t// applying `b1`, `b2`, `a1''`, `a2''`. Note how the operations get to a proper common state before each pair is\n\t// transformed.\n\t//\n\t// Another thing to consider is that an operation during transformation can be broken into multiple operations.\n\t// Suppose that `a1` * `b1` = `[ a11', a12' ]` (instead of `a1'` that we considered previously).\n\t//\n\t// In that case, we leave `a12'` for later and we continue transforming `a11'` until it is transformed by all `operationsB`\n\t// (in our case it is just `b2`). At this point, `b1` is transformed by \"whole\" `a1`, while `b2` is only transformed\n\t// by `a11'`. Similarly, `a12'` is only transformed by `b1`. This leads to a conclusion that we need to start transforming `a12'`\n\t// from the moment just after it was broken. So, `a12'` is transformed by `b2`. Now, \"the whole\" `a1` is transformed\n\t// by `operationsB`, while all `operationsB` are transformed by \"the whole\" `a1`. This means that we can continue with\n\t// following `operationsA` (in our case it is just `a2`).\n\t//\n\t// Of course, also `operationsB` can be broken. However, since we focus on transforming operation `a` to the end,\n\t// the only thing to do is to store both pieces of operation `b`, so that the next transformed operation `a` will\n\t// be transformed by both of them.\n\t//\n\t//                       *\n\t//                      / \\\n\t//                     /   \\\n\t//                    /     \\\n\t//                  b1       a1\n\t//                  /         \\\n\t//                 /           \\\n\t//                /             \\\n\t//               *               *\n\t//              / \\             / \\\n\t//             /  a11'         /   \\\n\t//            /     \\         /     \\\n\t//          b2       *      b1'      a2\n\t//          /       / \\     /         \\\n\t//         /       /  a12' /           \\\n\t//        /       /     \\ /             \\\n\t//       *       b2'     *               *\n\t//        \\     /       / \\             /\n\t//       a11'' /     b21'' \\           /\n\t//          \\ /       /     \\         /\n\t//           *       *      a2'     b1''\n\t//            \\     / \\       \\     /\n\t//          a12'' b22''\\       \\   /\n\t//              \\ /     \\       \\ /\n\t//               *      a2''     *\n\t//                \\       \\     /\n\t//                 \\       \\  b21'''\n\t//                  \\       \\ /\n\t//                a2'''      *\n\t//                    \\     /\n\t//                     \\  b22'''\n\t//                      \\ /\n\t//                       *\n\t//\n\t// Note, how `a1` is broken and transformed into `a11'` and `a12'`, while `b2'` got broken and transformed into `b21''` and `b22''`.\n\t//\n\t// Having all that on mind, here is an outline for the transformation process algorithm:\n\t//\n\t// 1. We have `operationsA` and `operationsB` array, which we dynamically update as the transformation process goes.\n\t//\n\t// 2. We take next (or first) operation from `operationsA` and check from which operation `b` we need to start transforming it.\n\t// All original `operationsA` are set to be transformed starting from the first operation `b`.\n\t//\n\t// 3. We take operations from `operationsB`, one by one, starting from the correct one, and transform operation `a`\n\t// by operation `b` (and vice versa). We update `operationsA` and `operationsB` by replacing the original operations\n\t// with the transformation results.\n\t//\n\t// 4. If operation is broken into multiple operations, we save all the new operations in the place of the\n\t// original operation.\n\t//\n\t// 5. Additionally, if operation `a` was broken, for the \"new\" operation, we remember from which operation `b` it should\n\t// be transformed by.\n\t//\n\t// 6. We continue transforming \"current\" operation `a` until it is transformed by all `operationsB`. Then, go to 2.\n\t// unless the last operation `a` was transformed.\n\t//\n\t// The actual implementation of the above algorithm is slightly different, as only one loop (while) is used.\n\t// The difference is that we have \"current\" `a` operation to transform and we store the index of the next `b` operation\n\t// to transform by. Each loop operates on two indexes then: index pointing to currently processed `a` operation and\n\t// index pointing to next `b` operation. Each loop is just one `a * b` + `b * a` transformation. After each loop\n\t// operation `b` index is updated. If all `b` operations were visited for the current `a` operation, we change\n\t// current `a` operation index to the next one.\n\t//\n\n\t// For each operation `a`, keeps information what is the index in `operationsB` from which the transformation should start.\n\tconst nextTransformIndex = new WeakMap();\n\n\t// For all the original `operationsA`, set that they should be transformed starting from the first of `operationsB`.\n\tfor ( const op of operationsA ) {\n\t\tnextTransformIndex.set( op, 0 );\n\t}\n\n\t// Additional data that is used for some postprocessing after the main transformation process is done.\n\tconst data = {\n\t\tnextBaseVersionA: operationsA[ operationsA.length - 1 ].baseVersion + 1,\n\t\tnextBaseVersionB: operationsB[ operationsB.length - 1 ].baseVersion + 1,\n\t\toriginalOperationsACount: operationsA.length,\n\t\toriginalOperationsBCount: operationsB.length\n\t};\n\n\t// Index of currently transformed operation `a`.\n\tlet i = 0;\n\n\t// While not all `operationsA` are transformed...\n\twhile ( i < operationsA.length ) {\n\t\t// Get \"current\" operation `a`.\n\t\tconst opA = operationsA[ i ];\n\n\t\t// For the \"current\" operation `a`, get the index of the next operation `b` to transform by.\n\t\tconst indexB = nextTransformIndex.get( opA );\n\n\t\t// If operation `a` was already transformed by every operation `b`, change \"current\" operation `a` to the next one.\n\t\tif ( indexB == operationsB.length ) {\n\t\t\ti++;\n\t\t\tcontinue;\n\t\t}\n\n\t\tconst opB = operationsB[ indexB ];\n\n\t\t// Transform `a` by `b` and `b` by `a`.\n\t\tconst newOpsA = transform( opA, opB, contextFactory.getContext( opA, opB, true ) );\n\t\tconst newOpsB = transform( opB, opA, contextFactory.getContext( opB, opA, false ) );\n\t\t// As a result we get one or more `newOpsA` and one or more `newOpsB` operations.\n\n\t\t// Update contextual information about operations.\n\t\tcontextFactory.updateRelation( opA, opB );\n\n\t\tcontextFactory.setOriginalOperations( newOpsA, opA );\n\t\tcontextFactory.setOriginalOperations( newOpsB, opB );\n\n\t\t// For new `a` operations, update their index of the next operation `b` to transform them by.\n\t\t//\n\t\t// This is needed even if there was only one result (`a` was not broken) because that information is used\n\t\t// at the beginning of this loop every time.\n\t\tfor ( const newOpA of newOpsA ) {\n\t\t\t// Acknowledge, that operation `b` also might be broken into multiple operations.\n\t\t\t//\n\t\t\t// This is why we raise `indexB` not just by 1. If `newOpsB` are multiple operations, they will be\n\t\t\t// spliced in the place of `opB`. So we need to change `transformBy` accordingly, so that an operation won't\n\t\t\t// be transformed by the same operation (part of it) again.\n\t\t\tnextTransformIndex.set( newOpA, indexB + newOpsB.length );\n\t\t}\n\n\t\t// Update `operationsA` and `operationsB` with the transformed versions.\n\t\toperationsA.splice( i, 1, ...newOpsA );\n\t\toperationsB.splice( indexB, 1, ...newOpsB );\n\t}\n\n\tif ( options.padWithNoOps ) {\n\t\t// If no-operations padding is enabled, count how many extra `a` and `b` operations were generated.\n\t\tconst brokenOperationsACount = operationsA.length - data.originalOperationsACount;\n\t\tconst brokenOperationsBCount = operationsB.length - data.originalOperationsBCount;\n\n\t\t// Then, if that number is not the same, pad `operationsA` or `operationsB` with correct number of no-ops so\n\t\t// that the base versions are equalled.\n\t\t//\n\t\t// Note that only one array will be updated, as only one of those subtractions can be greater than zero.\n\t\tpadWithNoOps( operationsA, brokenOperationsBCount - brokenOperationsACount );\n\t\tpadWithNoOps( operationsB, brokenOperationsACount - brokenOperationsBCount );\n\t}\n\n\t// Finally, update base versions of transformed operations.\n\tupdateBaseVersions( operationsA, data.nextBaseVersionB );\n\tupdateBaseVersions( operationsB, data.nextBaseVersionA );\n\n\treturn { operationsA, operationsB, originalOperations };\n}\n\n// Gathers additional data about operations processed during transformation. Can be used to obtain contextual information\n// about two operations that are about to be transformed. This contextual information can be used for better conflict resolution.\nclass ContextFactory {\n\t// Creates `ContextFactory` instance.\n\t//\n\t// @param {module:engine/model/document~Document} document Document which the operations change.\n\t// @param {Boolean} useRelations Whether during transformation relations should be used (used during undo for\n\t// better conflict resolution).\n\t// @param {Boolean} [forceWeakRemove=false] If set to `false`, remove operation will be always stronger than move operation,\n\t// so the removed nodes won't end up back in the document root. When set to `true`, context data will be used.\n\tconstructor( document, useRelations, forceWeakRemove = false ) {\n\t\t// For each operation that is created during transformation process, we keep a reference to the original operation\n\t\t// which it comes from. The original operation works as a kind of \"identifier\". Every contextual information\n\t\t// gathered during transformation that we want to save for given operation, is actually saved for the original operation.\n\t\t// This way no matter if operation `a` is cloned, then transformed, even breaks, we still have access to the previously\n\t\t// gathered data through original operation reference.\n\t\tthis.originalOperations = new Map();\n\n\t\t// `model.History` instance which information about undone operations will be taken from.\n\t\tthis._history = document.history;\n\n\t\t// Whether additional context should be used.\n\t\tthis._useRelations = useRelations;\n\n\t\tthis._forceWeakRemove = !!forceWeakRemove;\n\n\t\t// Relations is a double-map structure (maps in map) where for two operations we store how those operations were related\n\t\t// to each other. Those relations are evaluated during transformation process. For every transformated pair of operations\n\t\t// we keep relations between them.\n\t\tthis._relations = new Map();\n\t}\n\n\t// Sets \"original operation\" for given operations.\n\t//\n\t// During transformation process, operations are cloned, then changed, then processed again, sometimes broken into two\n\t// or multiple operations. When gathering additional data it is important that all operations can be somehow linked\n\t// so a cloned and transformed \"version\" still kept track of the data assigned earlier to it.\n\t//\n\t// The original operation object will be used as such an universal linking id. Throughout the transformation process\n\t// all cloned operations will refer to \"the original operation\" when storing and reading additional data.\n\t//\n\t// If `takeFrom` is not set, each operation from `operations` array will be assigned itself as \"the original operation\".\n\t// This should be used as an initialization step.\n\t//\n\t// If `takeFrom` is set, each operation from `operations` will be assigned the same original operation as assigned\n\t// for `takeFrom` operation. This should be used to update original operations. It should be used in a way that\n\t// `operations` are the result of `takeFrom` transformation to ensure proper \"original operation propagation\".\n\t//\n\t// @param {Array.<module:engine/model/operation/operation~Operation>} operations\n\t// @param {module:engine/model/operation/operation~Operation|null} [takeFrom=null]\n\tsetOriginalOperations( operations, takeFrom = null ) {\n\t\tconst originalOperation = takeFrom ? this.originalOperations.get( takeFrom ) : null;\n\n\t\tfor ( const operation of operations ) {\n\t\t\tthis.originalOperations.set( operation, originalOperation || operation );\n\t\t}\n\t}\n\n\t// Saves a relation between operations `opA` and `opB`.\n\t//\n\t// Relations are then later used to help solve conflicts when operations are transformed.\n\t//\n\t// @param {module:engine/model/operation/operation~Operation} opA\n\t// @param {module:engine/model/operation/operation~Operation} opB\n\tupdateRelation( opA, opB ) {\n\t\t// The use of relations is described in a bigger detail in transformation functions.\n\t\t//\n\t\t// In brief, this function, for specified pairs of operation types, checks how positions defined in those operations relate.\n\t\t// Then those relations are saved. For example, for two move operations, it is saved if one of those operations target\n\t\t// position is before the other operation source position. This kind of information gives contextual information when\n\t\t// transformation is used during undo. Similar checks are done for other pairs of operations.\n\t\t//\n\t\tswitch ( opA.constructor ) {\n\t\t\tcase MoveOperation: {\n\t\t\t\tswitch ( opB.constructor ) {\n\t\t\t\t\tcase MergeOperation: {\n\t\t\t\t\t\tif ( opA.targetPosition.isEqual( opB.sourcePosition ) || opB.movedRange.containsPosition( opA.targetPosition ) ) {\n\t\t\t\t\t\t\tthis._setRelation( opA, opB, 'insertAtSource' );\n\t\t\t\t\t\t} else if ( opA.targetPosition.isEqual( opB.deletionPosition ) ) {\n\t\t\t\t\t\t\tthis._setRelation( opA, opB, 'insertBetween' );\n\t\t\t\t\t\t} else if ( opA.targetPosition.isAfter( opB.sourcePosition ) ) {\n\t\t\t\t\t\t\tthis._setRelation( opA, opB, 'moveTargetAfter' );\n\t\t\t\t\t\t}\n\n\t\t\t\t\t\tbreak;\n\t\t\t\t\t}\n\n\t\t\t\t\tcase MoveOperation: {\n\t\t\t\t\t\tif ( opA.targetPosition.isEqual( opB.sourcePosition ) || opA.targetPosition.isBefore( opB.sourcePosition ) ) {\n\t\t\t\t\t\t\tthis._setRelation( opA, opB, 'insertBefore' );\n\t\t\t\t\t\t} else {\n\t\t\t\t\t\t\tthis._setRelation( opA, opB, 'insertAfter' );\n\t\t\t\t\t\t}\n\n\t\t\t\t\t\tbreak;\n\t\t\t\t\t}\n\t\t\t\t}\n\n\t\t\t\tbreak;\n\t\t\t}\n\n\t\t\tcase SplitOperation: {\n\t\t\t\tswitch ( opB.constructor ) {\n\t\t\t\t\tcase MergeOperation: {\n\t\t\t\t\t\tif ( opA.splitPosition.isBefore( opB.sourcePosition ) ) {\n\t\t\t\t\t\t\tthis._setRelation( opA, opB, 'splitBefore' );\n\t\t\t\t\t\t}\n\n\t\t\t\t\t\tbreak;\n\t\t\t\t\t}\n\n\t\t\t\t\tcase MoveOperation: {\n\t\t\t\t\t\tif ( opA.splitPosition.isEqual( opB.sourcePosition ) || opA.splitPosition.isBefore( opB.sourcePosition ) ) {\n\t\t\t\t\t\t\tthis._setRelation( opA, opB, 'splitBefore' );\n\t\t\t\t\t\t}\n\n\t\t\t\t\t\tbreak;\n\t\t\t\t\t}\n\t\t\t\t}\n\n\t\t\t\tbreak;\n\t\t\t}\n\n\t\t\tcase MergeOperation: {\n\t\t\t\tswitch ( opB.constructor ) {\n\t\t\t\t\tcase MergeOperation: {\n\t\t\t\t\t\tif ( !opA.targetPosition.isEqual( opB.sourcePosition ) ) {\n\t\t\t\t\t\t\tthis._setRelation( opA, opB, 'mergeTargetNotMoved' );\n\t\t\t\t\t\t}\n\n\t\t\t\t\t\tif ( opA.sourcePosition.isEqual( opB.targetPosition ) ) {\n\t\t\t\t\t\t\tthis._setRelation( opA, opB, 'mergeSourceNotMoved' );\n\t\t\t\t\t\t}\n\n\t\t\t\t\t\tif ( opA.sourcePosition.isEqual( opB.sourcePosition ) ) {\n\t\t\t\t\t\t\tthis._setRelation( opA, opB, 'mergeSameElement' );\n\t\t\t\t\t\t}\n\n\t\t\t\t\t\tbreak;\n\t\t\t\t\t}\n\n\t\t\t\t\tcase SplitOperation: {\n\t\t\t\t\t\tif ( opA.sourcePosition.isEqual( opB.splitPosition ) ) {\n\t\t\t\t\t\t\tthis._setRelation( opA, opB, 'splitAtSource' );\n\t\t\t\t\t\t}\n\t\t\t\t\t}\n\t\t\t\t}\n\n\t\t\t\tbreak;\n\t\t\t}\n\n\t\t\tcase MarkerOperation: {\n\t\t\t\tconst markerRange = opA.newRange;\n\n\t\t\t\tif ( !markerRange ) {\n\t\t\t\t\treturn;\n\t\t\t\t}\n\n\t\t\t\tswitch ( opB.constructor ) {\n\t\t\t\t\tcase MoveOperation: {\n\t\t\t\t\t\tconst movedRange = Range._createFromPositionAndShift( opB.sourcePosition, opB.howMany );\n\n\t\t\t\t\t\tconst affectedLeft = movedRange.containsPosition( markerRange.start ) ||\n\t\t\t\t\t\t\tmovedRange.start.isEqual( markerRange.start );\n\n\t\t\t\t\t\tconst affectedRight = movedRange.containsPosition( markerRange.end ) ||\n\t\t\t\t\t\t\tmovedRange.end.isEqual( markerRange.end );\n\n\t\t\t\t\t\tif ( ( affectedLeft || affectedRight ) && !movedRange.containsRange( markerRange ) ) {\n\t\t\t\t\t\t\tthis._setRelation( opA, opB, {\n\t\t\t\t\t\t\t\tside: affectedLeft ? 'left' : 'right',\n\t\t\t\t\t\t\t\tpath: affectedLeft ? markerRange.start.path.slice() : markerRange.end.path.slice()\n\t\t\t\t\t\t\t} );\n\t\t\t\t\t\t}\n\n\t\t\t\t\t\tbreak;\n\t\t\t\t\t}\n\n\t\t\t\t\tcase MergeOperation: {\n\t\t\t\t\t\tconst wasInLeftElement = markerRange.start.isEqual( opB.targetPosition );\n\t\t\t\t\t\tconst wasStartBeforeMergedElement = markerRange.start.isEqual( opB.deletionPosition );\n\t\t\t\t\t\tconst wasEndBeforeMergedElement = markerRange.end.isEqual( opB.deletionPosition );\n\t\t\t\t\t\tconst wasInRightElement = markerRange.end.isEqual( opB.sourcePosition );\n\n\t\t\t\t\t\tif ( wasInLeftElement || wasStartBeforeMergedElement || wasEndBeforeMergedElement || wasInRightElement ) {\n\t\t\t\t\t\t\tthis._setRelation( opA, opB, {\n\t\t\t\t\t\t\t\twasInLeftElement,\n\t\t\t\t\t\t\t\twasStartBeforeMergedElement,\n\t\t\t\t\t\t\t\twasEndBeforeMergedElement,\n\t\t\t\t\t\t\t\twasInRightElement\n\t\t\t\t\t\t\t} );\n\t\t\t\t\t\t}\n\n\t\t\t\t\t\tbreak;\n\t\t\t\t\t}\n\t\t\t\t}\n\n\t\t\t\tbreak;\n\t\t\t}\n\t\t}\n\t}\n\n\t// Evaluates and returns contextual information about two given operations `opA` and `opB` which are about to be transformed.\n\t//\n\t// @param {module:engine/model/operation/operation~Operation} opA\n\t// @param {module:engine/model/operation/operation~Operation} opB\n\t// @returns {module:engine/model/operation/transform~TransformationContext}\n\tgetContext( opA, opB, aIsStrong ) {\n\t\treturn {\n\t\t\taIsStrong,\n\t\t\taWasUndone: this._wasUndone( opA ),\n\t\t\tbWasUndone: this._wasUndone( opB ),\n\t\t\tabRelation: this._useRelations ? this._getRelation( opA, opB ) : null,\n\t\t\tbaRelation: this._useRelations ? this._getRelation( opB, opA ) : null,\n\t\t\tforceWeakRemove: this._forceWeakRemove\n\t\t};\n\t}\n\n\t// Returns whether given operation `op` has already been undone.\n\t//\n\t// Information whether an operation was undone gives more context when making a decision when two operations are in conflict.\n\t//\n\t// @param {module:engine/model/operation/operation~Operation} op\n\t// @returns {Boolean}\n\t_wasUndone( op ) {\n\t\t// For `op`, get its original operation. After all, if `op` is a clone (or even transformed clone) of another\n\t\t// operation, literally `op` couldn't be undone. It was just generated. If anything, it was the operation it origins\n\t\t// from which was undone. So get that original operation.\n\t\tconst originalOp = this.originalOperations.get( op );\n\n\t\t// And check with the document if the original operation was undone.\n\t\treturn originalOp.wasUndone || this._history.isUndoneOperation( originalOp );\n\t}\n\n\t// Returns a relation between `opA` and an operation which is undone by `opB`. This can be `String` value if a relation\n\t// was set earlier or `null` if there was no relation between those operations.\n\t//\n\t// This is a little tricky to understand, so let's compare it to `ContextFactory#_wasUndone`.\n\t//\n\t// When `wasUndone( opB )` is used, we check if the `opB` has already been undone. It is obvious, that the\n\t// undoing operation must happen after the undone operation. So, essentially, we have `opB`, we take document history,\n\t// we look forward in the future and ask if in that future `opB` was undone.\n\t//\n\t// Relations is a backward process to `wasUndone()`.\n\t//\n\t// Long story short - using relations is asking what happened in the past. Looking back. This time we have an undoing\n\t// operation `opB` which has undone some other operation. When there is a transformation `opA` x `opB` and there is\n\t// a conflict to solve and `opB` is an undoing operation, we can look back in the history and see what was a relation\n\t// between `opA` and the operation which `opB` undone. Basing on that relation from the past, we can now make\n\t// a better decision when resolving a conflict between two operations, because we know more about the context of\n\t// those two operations.\n\t//\n\t// This is why this function does not return a relation directly between `opA` and `opB` because we need to look\n\t// back to search for a meaningful contextual information.\n\t//\n\t// @param {module:engine/model/operation/operation~Operation} opA\n\t// @param {module:engine/model/operation/operation~Operation} opB\n\t// @returns {String|null}\n\t_getRelation( opA, opB ) {\n\t\t// Get the original operation. Similarly as in `wasUndone()` it is used as an universal identifier for stored data.\n\t\tconst origB = this.originalOperations.get( opB );\n\t\tconst undoneB = this._history.getUndoneOperation( origB );\n\n\t\t// If `opB` is not undoing any operation, there is no relation.\n\t\tif ( !undoneB ) {\n\t\t\treturn null;\n\t\t}\n\n\t\tconst origA = this.originalOperations.get( opA );\n\t\tconst relationsA = this._relations.get( origA );\n\n\t\t// Get all relations for `opA`, and check if there is a relation with `opB`-undone-counterpart. If so, return it.\n\t\tif ( relationsA ) {\n\t\t\treturn relationsA.get( undoneB ) || null;\n\t\t}\n\n\t\treturn null;\n\t}\n\n\t// Helper function for `ContextFactory#updateRelations`.\n\t//\n\t// @private\n\t// @param {module:engine/model/operation/operation~Operation} opA\n\t// @param {module:engine/model/operation/operation~Operation} opB\n\t// @param {String} relation\n\t_setRelation( opA, opB, relation ) {\n\t\t// As always, setting is for original operations, not the clones/transformed operations.\n\t\tconst origA = this.originalOperations.get( opA );\n\t\tconst origB = this.originalOperations.get( opB );\n\n\t\tlet relationsA = this._relations.get( origA );\n\n\t\tif ( !relationsA ) {\n\t\t\trelationsA = new Map();\n\t\t\tthis._relations.set( origA, relationsA );\n\t\t}\n\n\t\trelationsA.set( origB, relation );\n\t}\n}\n\n/**\n * Holds additional contextual information about a transformed pair of operations (`a` and `b`). Those information\n * can be used for better conflict resolving.\n *\n * @typedef {Object} module:engine/model/operation/transform~TransformationContext\n *\n * @property {Boolean} aIsStrong Whether `a` is strong operation in this transformation, or weak.\n * @property {Boolean} aWasUndone Whether `a` operation was undone.\n * @property {Boolean} bWasUndone Whether `b` operation was undone.\n * @property {String|null} abRelation The relation between `a` operation and an operation undone by `b` operation.\n * @property {String|null} baRelation The relation between `b` operation and an operation undone by `a` operation.\n */\n\n/**\n * An utility function that updates {@link module:engine/model/operation/operation~Operation#baseVersion base versions}\n * of passed operations.\n *\n * The function simply sets `baseVersion` as a base version of the first passed operation and then increments it for\n * each following operation in `operations`.\n *\n * @private\n * @param {Array.<module:engine/model/operation/operation~Operation>} operations Operations to update.\n * @param {Number} baseVersion Base version to set for the first operation in `operations`.\n */\nfunction updateBaseVersions( operations, baseVersion ) {\n\tfor ( const operation of operations ) {\n\t\toperation.baseVersion = baseVersion++;\n\t}\n}\n\n/**\n * Adds `howMany` instances of {@link module:engine/model/operation/nooperation~NoOperation} to `operations` set.\n *\n * @private\n * @param {Array.<module:engine/model/operation/operation~Operation>} operations\n * @param {Number} howMany\n */\nfunction padWithNoOps( operations, howMany ) {\n\tfor ( let i = 0; i < howMany; i++ ) {\n\t\toperations.push( new NoOperation( 0 ) );\n\t}\n}\n\n// -----------------------\n\nsetTransformation( AttributeOperation, AttributeOperation, ( a, b, context ) => {\n\t// If operations in conflict, check if their ranges intersect and manage them properly.\n\t//\n\t// Operations can be in conflict only if:\n\t//\n\t// * their key is the same (they change the same attribute), and\n\t// * they are in the same parent (operations for ranges [ 1 ] - [ 3 ] and [ 2, 0 ] - [ 2, 5 ] change different\n\t// elements and can't be in conflict).\n\tif ( a.key === b.key && a.range.start.hasSameParentAs( b.range.start ) ) {\n\t\t// First, we want to apply change to the part of a range that has not been changed by the other operation.\n\t\tconst operations = a.range.getDifference( b.range ).map( range => {\n\t\t\treturn new AttributeOperation( range, a.key, a.oldValue, a.newValue, 0 );\n\t\t} );\n\n\t\t// Then we take care of the common part of ranges.\n\t\tconst common = a.range.getIntersection( b.range );\n\n\t\tif ( common ) {\n\t\t\t// If this operation is more important, we also want to apply change to the part of the\n\t\t\t// original range that has already been changed by the other operation. Since that range\n\t\t\t// got changed we also have to update `oldValue`.\n\t\t\tif ( context.aIsStrong ) {\n\t\t\t\toperations.push( new AttributeOperation( common, b.key, b.newValue, a.newValue, 0 ) );\n\t\t\t}\n\t\t}\n\n\t\tif ( operations.length == 0 ) {\n\t\t\treturn [ new NoOperation( 0 ) ];\n\t\t}\n\n\t\treturn operations;\n\t} else {\n\t\t// If operations don't conflict, simply return an array containing just a clone of this operation.\n\t\treturn [ a ];\n\t}\n} );\n\nsetTransformation( AttributeOperation, InsertOperation, ( a, b ) => {\n\t// Case 1:\n\t//\n\t// The attribute operation range includes the position where nodes were inserted.\n\t// There are two possible scenarios: the inserted nodes were text and they should receive attributes or\n\t// the inserted nodes were elements and they should not receive attributes.\n\t//\n\tif ( a.range.start.hasSameParentAs( b.position ) && a.range.containsPosition( b.position ) ) {\n\t\t// If new nodes should not receive attributes, two separated ranges will be returned.\n\t\t// Otherwise, one expanded range will be returned.\n\t\tconst range = a.range._getTransformedByInsertion( b.position, b.howMany, !b.shouldReceiveAttributes );\n\t\tconst result = range.map( r => {\n\t\t\treturn new AttributeOperation( r, a.key, a.oldValue, a.newValue, a.baseVersion );\n\t\t} );\n\n\t\tif ( b.shouldReceiveAttributes ) {\n\t\t\t// `AttributeOperation#range` includes some newly inserted text.\n\t\t\t// The operation should also change the attribute of that text. An example:\n\t\t\t//\n\t\t\t// Bold should be applied on the following range:\n\t\t\t// <p>Fo[zb]ar</p>\n\t\t\t//\n\t\t\t// In meantime, new text is typed:\n\t\t\t// <p>Fozxxbar</p>\n\t\t\t//\n\t\t\t// Bold should be applied also on the new text:\n\t\t\t// <p>Fo[zxxb]ar</p>\n\t\t\t// <p>Fo<$text bold=\"true\">zxxb</$text>ar</p>\n\t\t\t//\n\t\t\t// There is a special case to consider here to consider.\n\t\t\t//\n\t\t\t// Consider setting an attribute with multiple possible values, for example `highlight`. The inserted text might\n\t\t\t// have already an attribute value applied and the `oldValue` property of the attribute operation might be wrong:\n\t\t\t//\n\t\t\t// Attribute `highlight=\"yellow\"` should be applied on the following range:\n\t\t\t// <p>Fo[zb]ar<p>\n\t\t\t//\n\t\t\t// In meantime, character `x` with `highlight=\"red\"` is typed:\n\t\t\t// <p>Fo[z<$text highlight=\"red\">x</$text>b]ar</p>\n\t\t\t//\n\t\t\t// In this case we cannot simply apply operation changing the attribute value from `null` to `\"yellow\"` for the whole range\n\t\t\t// because that would lead to an exception (`oldValue` is incorrect for `x`).\n\t\t\t//\n\t\t\t// We also cannot break the original range as this would mess up a scenario when there are multiple following\n\t\t\t// insert operations, because then only the first inserted character is included in those ranges:\n\t\t\t// <p>Fo[z][x][b]ar</p>   -->   <p>Fo[z][x]x[b]ar</p>   -->   <p>Fo[z][x]xx[b]ar</p>\n\t\t\t//\n\t\t\t// So, the attribute range needs be expanded, no matter what attributes are set on the inserted nodes:\n\t\t\t//\n\t\t\t// <p>Fo[z<$text highlight=\"red\">x</$text>b]ar</p>      <--- Change from `null` to `yellow`, throwing an exception.\n\t\t\t//\n\t\t\t// But before that operation would be applied, we will add an additional attribute operation that will change\n\t\t\t// attributes on the inserted nodes in a way which would make the original operation correct:\n\t\t\t//\n\t\t\t// <p>Fo[z{<$text highlight=\"red\">}x</$text>b]ar</p>    <--- Change range `{}` from `red` to `null`.\n\t\t\t// <p>Fo[zxb]ar</p>                                     <--- Now change from `null` to `yellow` is completely fine.\n\t\t\t//\n\n\t\t\t// Generate complementary attribute operation. Be sure to add it before the original operation.\n\t\t\tconst op = _getComplementaryAttributeOperations( b, a.key, a.oldValue );\n\n\t\t\tif ( op ) {\n\t\t\t\tresult.unshift( op );\n\t\t\t}\n\t\t}\n\n\t\t// If nodes should not receive new attribute, we are done here.\n\t\treturn result;\n\t}\n\n\t// If insert operation is not expanding the attribute operation range, simply transform the range.\n\ta.range = a.range._getTransformedByInsertion( b.position, b.howMany, false )[ 0 ];\n\n\treturn [ a ];\n} );\n\n/**\n * Helper function for `AttributeOperation` x `InsertOperation` (and reverse) transformation.\n *\n * For given `insertOperation` it checks the inserted node if it has an attribute `key` set to a value different\n * than `newValue`. If so, it generates an `AttributeOperation` which changes the value of `key` attribute to `newValue`.\n *\n * @private\n * @param {module:engine/model/operation/insertoperation~InsertOperation} insertOperation\n * @param {String} key\n * @param {*} newValue\n * @returns {module:engine/model/operation/attributeoperation~AttributeOperation|null}\n */\nfunction _getComplementaryAttributeOperations( insertOperation, key, newValue ) {\n\tconst nodes = insertOperation.nodes;\n\n\t// At the beginning we store the attribute value from the first node.\n\tconst insertValue = nodes.getNode( 0 ).getAttribute( key );\n\n\tif ( insertValue == newValue ) {\n\t\treturn null;\n\t}\n\n\tconst range = new Range( insertOperation.position, insertOperation.position.getShiftedBy( insertOperation.howMany ) );\n\n\treturn new AttributeOperation( range, key, insertValue, newValue, 0 );\n}\n\nsetTransformation( AttributeOperation, MergeOperation, ( a, b ) => {\n\tconst ranges = [];\n\n\t// Case 1:\n\t//\n\t// Attribute change on the merged element. In this case, the merged element was moved to the graveyard.\n\t// An additional attribute operation that will change the (re)moved element needs to be generated.\n\t//\n\tif ( a.range.start.hasSameParentAs( b.deletionPosition ) ) {\n\t\tif ( a.range.containsPosition( b.deletionPosition ) || a.range.start.isEqual( b.deletionPosition ) ) {\n\t\t\tranges.push( Range._createFromPositionAndShift( b.graveyardPosition, 1 ) );\n\t\t}\n\t}\n\n\tconst range = a.range._getTransformedByMergeOperation( b );\n\n\t// Do not add empty (collapsed) ranges to the result. `range` may be collapsed if it contained only the merged element.\n\tif ( !range.isCollapsed ) {\n\t\tranges.push( range );\n\t}\n\n\t// Create `AttributeOperation`s out of the ranges.\n\treturn ranges.map( range => {\n\t\treturn new AttributeOperation( range, a.key, a.oldValue, a.newValue, a.baseVersion );\n\t} );\n} );\n\nsetTransformation( AttributeOperation, MoveOperation, ( a, b ) => {\n\tconst ranges = _breakRangeByMoveOperation( a.range, b );\n\n\t// Create `AttributeOperation`s out of the ranges.\n\treturn ranges.map( range => new AttributeOperation( range, a.key, a.oldValue, a.newValue, a.baseVersion ) );\n} );\n\n// Helper function for `AttributeOperation` x `MoveOperation` transformation.\n//\n// Takes the passed `range` and transforms it by move operation `moveOp` in a specific way. Only top-level nodes of `range`\n// are considered to be in the range. If move operation moves nodes deep from inside of the range, those nodes won't\n// be included in the result. In other words, top-level nodes of the ranges from the result are exactly the same as\n// top-level nodes of the original `range`.\n//\n// This is important for `AttributeOperation` because, for its range, it changes only the top-level nodes. So we need to\n// track only how those nodes have been affected by `MoveOperation`.\n//\n// @private\n// @param {module:engine/model/range~Range} range\n// @param {module:engine/model/operation/moveoperation~MoveOperation} moveOp\n// @returns {Array.<module:engine/model/range~Range>}\nfunction _breakRangeByMoveOperation( range, moveOp ) {\n\tconst moveRange = Range._createFromPositionAndShift( moveOp.sourcePosition, moveOp.howMany );\n\n\t// We are transforming `range` (original range) by `moveRange` (range moved by move operation). As usual when it comes to\n\t// transforming a ranges, we may have a common part of the ranges and we may have a difference part (zero to two ranges).\n\tlet common = null;\n\tlet difference = [];\n\n\t// Let's compare the ranges.\n\tif ( moveRange.containsRange( range, true ) ) {\n\t\t// If the whole original range is moved, treat it whole as a common part. There's also no difference part.\n\t\tcommon = range;\n\t} else if ( range.start.hasSameParentAs( moveRange.start ) ) {\n\t\t// If the ranges are \"on the same level\" (in the same parent) then move operation may move exactly those nodes\n\t\t// that are changed by the attribute operation. In this case we get common part and difference part in the usual way.\n\t\tdifference = range.getDifference( moveRange );\n\t\tcommon = range.getIntersection( moveRange );\n\t} else {\n\t\t// In any other situation we assume that original range is different than move range, that is that move operation\n\t\t// moves other nodes that attribute operation change. Even if the moved range is deep inside in the original range.\n\t\t//\n\t\t// Note that this is different than in `.getIntersection` (we would get a common part in that case) and different\n\t\t// than `.getDifference` (we would get two ranges).\n\t\tdifference = [ range ];\n\t}\n\n\tconst result = [];\n\n\t// The default behaviour of `_getTransformedByMove` might get wrong results for difference part, though, so\n\t// we do it by hand.\n\tfor ( let diff of difference ) {\n\t\t// First, transform the range by removing moved nodes. Since this is a difference, this is safe, `null` won't be returned\n\t\t// as the range is different than the moved range.\n\t\tdiff = diff._getTransformedByDeletion( moveOp.sourcePosition, moveOp.howMany );\n\n\t\t// Transform also `targetPosition`.\n\t\tconst targetPosition = moveOp.getMovedRangeStart();\n\n\t\t// Spread the range only if moved nodes are inserted only between the top-level nodes of the `diff` range.\n\t\tconst spread = diff.start.hasSameParentAs( targetPosition );\n\n\t\t// Transform by insertion of moved nodes.\n\t\tdiff = diff._getTransformedByInsertion( targetPosition, moveOp.howMany, spread );\n\n\t\tresult.push( ...diff );\n\t}\n\n\t// Common part can be simply transformed by the move operation. This is because move operation will not target to\n\t// that common part (the operation would have to target inside its own moved range).\n\tif ( common ) {\n\t\tresult.push(\n\t\t\tcommon._getTransformedByMove( moveOp.sourcePosition, moveOp.targetPosition, moveOp.howMany, false )[ 0 ]\n\t\t);\n\t}\n\n\treturn result;\n}\n\nsetTransformation( AttributeOperation, SplitOperation, ( a, b ) => {\n\t// Case 1:\n\t//\n\t// Split node is the last node in `AttributeOperation#range`.\n\t// `AttributeOperation#range` needs to be expanded to include the new (split) node.\n\t//\n\t// Attribute `type` to be changed to `numbered` but the `listItem` is split.\n\t// <listItem type=\"bulleted\">foobar</listItem>\n\t//\n\t// After split:\n\t// <listItem type=\"bulleted\">foo</listItem><listItem type=\"bulleted\">bar</listItem>\n\t//\n\t// After attribute change:\n\t// <listItem type=\"numbered\">foo</listItem><listItem type=\"numbered\">foo</listItem>\n\t//\n\tif ( a.range.end.isEqual( b.insertionPosition ) ) {\n\t\tif ( !b.graveyardPosition ) {\n\t\t\ta.range.end.offset++;\n\t\t}\n\n\t\treturn [ a ];\n\t}\n\n\t// Case 2:\n\t//\n\t// Split position is inside `AttributeOperation#range`, at the same level, so the nodes to change are\n\t// not going to make a flat range.\n\t//\n\t// Content with range-to-change and split position:\n\t// <p>Fo[zb^a]r</p>\n\t//\n\t// After split:\n\t// <p>Fozb</p><p>ar</p>\n\t//\n\t// Make two separate ranges containing all nodes to change:\n\t// <p>Fo[zb]</p><p>[a]r</p>\n\t//\n\tif ( a.range.start.hasSameParentAs( b.splitPosition ) && a.range.containsPosition( b.splitPosition ) ) {\n\t\tconst secondPart = a.clone();\n\n\t\tsecondPart.range = new Range(\n\t\t\tb.moveTargetPosition.clone(),\n\t\t\ta.range.end._getCombined( b.splitPosition, b.moveTargetPosition )\n\t\t);\n\n\t\ta.range.end = b.splitPosition.clone();\n\t\ta.range.end.stickiness = 'toPrevious';\n\n\t\treturn [ a, secondPart ];\n\t}\n\n\t// The default case.\n\t//\n\ta.range = a.range._getTransformedBySplitOperation( b );\n\n\treturn [ a ];\n} );\n\nsetTransformation( InsertOperation, AttributeOperation, ( a, b ) => {\n\tconst result = [ a ];\n\n\t// Case 1:\n\t//\n\t// The attribute operation range includes the position where nodes were inserted.\n\t// There are two possible scenarios: the inserted nodes were text and they should receive attributes or\n\t// the inserted nodes were elements and they should not receive attributes.\n\t//\n\t// This is a mirror scenario to the one described in `AttributeOperation` x `InsertOperation` transformation,\n\t// although this case is a little less complicated. In this case we simply need to change attributes of the\n\t// inserted nodes and that's it.\n\t//\n\tif ( a.shouldReceiveAttributes && a.position.hasSameParentAs( b.range.start ) && b.range.containsPosition( a.position ) ) {\n\t\tconst op = _getComplementaryAttributeOperations( a, b.key, b.newValue );\n\n\t\tif ( op ) {\n\t\t\tresult.push( op );\n\t\t}\n\t}\n\n\t// The default case is: do nothing.\n\t// `AttributeOperation` does not change the model tree structure so `InsertOperation` does not need to be changed.\n\t//\n\treturn result;\n} );\n\nsetTransformation( InsertOperation, InsertOperation, ( a, b, context ) => {\n\t// Case 1:\n\t//\n\t// Two insert operations insert nodes at the same position. Since they are the same, it needs to be decided\n\t// what will be the order of inserted nodes. However, there is no additional information to help in that\n\t// decision. Also, when `b` will be transformed by `a`, the same order must be maintained.\n\t//\n\t// To achieve that, we will check if the operation is strong.\n\t// If it is, it won't get transformed. If it is not, it will be moved.\n\t//\n\tif ( a.position.isEqual( b.position ) && context.aIsStrong ) {\n\t\treturn [ a ];\n\t}\n\n\t// The default case.\n\t//\n\ta.position = a.position._getTransformedByInsertOperation( b );\n\n\treturn [ a ];\n} );\n\nsetTransformation( InsertOperation, MoveOperation, ( a, b ) => {\n\t// The default case.\n\t//\n\ta.position = a.position._getTransformedByMoveOperation( b );\n\n\treturn [ a ];\n} );\n\nsetTransformation( InsertOperation, SplitOperation, ( a, b ) => {\n\t// The default case.\n\t//\n\ta.position = a.position._getTransformedBySplitOperation( b );\n\n\treturn [ a ];\n} );\n\nsetTransformation( InsertOperation, MergeOperation, ( a, b ) => {\n\ta.position = a.position._getTransformedByMergeOperation( b );\n\n\treturn [ a ];\n} );\n\n// -----------------------\n\nsetTransformation( MarkerOperation, InsertOperation, ( a, b ) => {\n\tif ( a.oldRange ) {\n\t\ta.oldRange = a.oldRange._getTransformedByInsertOperation( b )[ 0 ];\n\t}\n\n\tif ( a.newRange ) {\n\t\ta.newRange = a.newRange._getTransformedByInsertOperation( b )[ 0 ];\n\t}\n\n\treturn [ a ];\n} );\n\nsetTransformation( MarkerOperation, MarkerOperation, ( a, b, context ) => {\n\tif ( a.name == b.name ) {\n\t\tif ( context.aIsStrong ) {\n\t\t\ta.oldRange = b.newRange ? b.newRange.clone() : null;\n\t\t} else {\n\t\t\treturn [ new NoOperation( 0 ) ];\n\t\t}\n\t}\n\n\treturn [ a ];\n} );\n\nsetTransformation( MarkerOperation, MergeOperation, ( a, b ) => {\n\tif ( a.oldRange ) {\n\t\ta.oldRange = a.oldRange._getTransformedByMergeOperation( b );\n\t}\n\n\tif ( a.newRange ) {\n\t\ta.newRange = a.newRange._getTransformedByMergeOperation( b );\n\t}\n\n\treturn [ a ];\n} );\n\nsetTransformation( MarkerOperation, MoveOperation, ( a, b, context ) => {\n\tif ( a.oldRange ) {\n\t\ta.oldRange = Range._createFromRanges( a.oldRange._getTransformedByMoveOperation( b ) );\n\t}\n\n\tif ( a.newRange ) {\n\t\tif ( context.abRelation ) {\n\t\t\tconst aNewRange = Range._createFromRanges( a.newRange._getTransformedByMoveOperation( b ) );\n\n\t\t\tif ( context.abRelation.side == 'left' && b.targetPosition.isEqual( a.newRange.start ) ) {\n\t\t\t\ta.newRange.start.path = context.abRelation.path;\n\t\t\t\ta.newRange.end = aNewRange.end;\n\n\t\t\t\treturn [ a ];\n\t\t\t} else if ( context.abRelation.side == 'right' && b.targetPosition.isEqual( a.newRange.end ) ) {\n\t\t\t\ta.newRange.start = aNewRange.start;\n\t\t\t\ta.newRange.end.path = context.abRelation.path;\n\n\t\t\t\treturn [ a ];\n\t\t\t}\n\t\t}\n\n\t\ta.newRange = Range._createFromRanges( a.newRange._getTransformedByMoveOperation( b ) );\n\t}\n\n\treturn [ a ];\n} );\n\nsetTransformation( MarkerOperation, SplitOperation, ( a, b, context ) => {\n\tif ( a.oldRange ) {\n\t\ta.oldRange = a.oldRange._getTransformedBySplitOperation( b );\n\t}\n\n\tif ( a.newRange ) {\n\t\tif ( context.abRelation ) {\n\t\t\tconst aNewRange = a.newRange._getTransformedBySplitOperation( b );\n\n\t\t\tif ( a.newRange.start.isEqual( b.splitPosition ) && context.abRelation.wasStartBeforeMergedElement ) {\n\t\t\t\ta.newRange.start = Position._createAt( b.insertionPosition );\n\t\t\t} else if ( a.newRange.start.isEqual( b.splitPosition ) && !context.abRelation.wasInLeftElement ) {\n\t\t\t\ta.newRange.start = Position._createAt( b.moveTargetPosition );\n\t\t\t}\n\n\t\t\tif ( a.newRange.end.isEqual( b.splitPosition ) && context.abRelation.wasInRightElement ) {\n\t\t\t\ta.newRange.end = Position._createAt( b.moveTargetPosition );\n\t\t\t} else if ( a.newRange.end.isEqual( b.splitPosition ) && context.abRelation.wasEndBeforeMergedElement ) {\n\t\t\t\ta.newRange.end = Position._createAt( b.insertionPosition );\n\t\t\t} else {\n\t\t\t\ta.newRange.end = aNewRange.end;\n\t\t\t}\n\n\t\t\treturn [ a ];\n\t\t}\n\n\t\ta.newRange = a.newRange._getTransformedBySplitOperation( b );\n\t}\n\n\treturn [ a ];\n} );\n\n// -----------------------\n\nsetTransformation( MergeOperation, InsertOperation, ( a, b ) => {\n\tif ( a.sourcePosition.hasSameParentAs( b.position ) ) {\n\t\ta.howMany += b.howMany;\n\t}\n\n\ta.sourcePosition = a.sourcePosition._getTransformedByInsertOperation( b );\n\ta.targetPosition = a.targetPosition._getTransformedByInsertOperation( b );\n\n\treturn [ a ];\n} );\n\nsetTransformation( MergeOperation, MergeOperation, ( a, b, context ) => {\n\t// Case 1:\n\t//\n\t// Same merge operations.\n\t//\n\t// Both operations have same source and target positions. So the element already got merged and there is\n\t// theoretically nothing to do.\n\t//\n\tif ( a.sourcePosition.isEqual( b.sourcePosition ) && a.targetPosition.isEqual( b.targetPosition ) ) {\n\t\t// There are two ways that we can provide a do-nothing operation.\n\t\t//\n\t\t// First is simply a NoOperation instance. We will use it if `b` operation was not undone.\n\t\t//\n\t\t// Second is a merge operation that has the source operation in the merged element - in the graveyard -\n\t\t// same target position and `howMany` equal to `0`. So it is basically merging an empty element from graveyard\n\t\t// which is almost the same as NoOperation.\n\t\t//\n\t\t// This way the merge operation can be later transformed by split operation\n\t\t// to provide correct undo. This will be used if `b` operation was undone (only then it is correct).\n\t\t//\n\t\tif ( !context.bWasUndone ) {\n\t\t\treturn [ new NoOperation( 0 ) ];\n\t\t} else {\n\t\t\tconst path = b.graveyardPosition.path.slice();\n\t\t\tpath.push( 0 );\n\n\t\t\ta.sourcePosition = new Position( b.graveyardPosition.root, path );\n\t\t\ta.howMany = 0;\n\n\t\t\treturn [ a ];\n\t\t}\n\t}\n\n\t// Case 2:\n\t//\n\t// Same merge source position but different target position.\n\t//\n\t// This can happen during collaboration. For example, if one client merged a paragraph to the previous paragraph\n\t// and the other person removed that paragraph and merged the same paragraph to something before:\n\t//\n\t// Client A:\n\t// <p>Foo</p><p>Bar</p><p>[]Xyz</p>\n\t// <p>Foo</p><p>BarXyz</p>\n\t//\n\t// Client B:\n\t// <p>Foo</p>[<p>Bar</p>]<p>Xyz</p>\n\t// <p>Foo</p><p>[]Xyz</p>\n\t// <p>FooXyz</p>\n\t//\n\t// In this case we need to decide where finally \"Xyz\" will land:\n\t//\n\t// <p>FooXyz</p>               graveyard: <p>Bar</p>\n\t// <p>Foo</p>                  graveyard: <p>BarXyz</p>\n\t//\n\t// Let's move it in a way so that a merge operation that does not target to graveyard is more important so that\n\t// nodes does not end up in the graveyard. It makes sense. Both for Client A and for Client B \"Xyz\" finally did not\n\t// end up in the graveyard (see above).\n\t//\n\t// If neither or both operations point to graveyard, then let `aIsStrong` decide.\n\t//\n\tif (\n\t\ta.sourcePosition.isEqual( b.sourcePosition ) && !a.targetPosition.isEqual( b.targetPosition ) &&\n\t\t!context.bWasUndone && context.abRelation != 'splitAtSource'\n\t) {\n\t\tconst aToGraveyard = a.targetPosition.root.rootName == '$graveyard';\n\t\tconst bToGraveyard = b.targetPosition.root.rootName == '$graveyard';\n\n\t\t// If `aIsWeak` it means that `a` points to graveyard while `b` doesn't. Don't move nodes then.\n\t\tconst aIsWeak = aToGraveyard && !bToGraveyard;\n\n\t\t// If `bIsWeak` it means that `b` points to graveyard while `a` doesn't. Force moving nodes then.\n\t\tconst bIsWeak = bToGraveyard && !aToGraveyard;\n\n\t\t// Force move if `b` is weak or neither operation is weak but `a` is stronger through `context.aIsStrong`.\n\t\tconst forceMove = bIsWeak || ( !aIsWeak && context.aIsStrong );\n\n\t\tif ( forceMove ) {\n\t\t\tconst sourcePosition = b.targetPosition._getTransformedByMergeOperation( b );\n\t\t\tconst targetPosition = a.targetPosition._getTransformedByMergeOperation( b );\n\n\t\t\treturn [ new MoveOperation( sourcePosition, a.howMany, targetPosition, 0 ) ];\n\t\t} else {\n\t\t\treturn [ new NoOperation( 0 ) ];\n\t\t}\n\t}\n\n\t// The default case.\n\t//\n\tif ( a.sourcePosition.hasSameParentAs( b.targetPosition ) ) {\n\t\ta.howMany += b.howMany;\n\t}\n\n\ta.sourcePosition = a.sourcePosition._getTransformedByMergeOperation( b );\n\ta.targetPosition = a.targetPosition._getTransformedByMergeOperation( b );\n\n\t// Handle positions in graveyard.\n\t// If graveyard positions are same and `a` operation is strong - do not transform.\n\tif ( !a.graveyardPosition.isEqual( b.graveyardPosition ) || !context.aIsStrong ) {\n\t\ta.graveyardPosition = a.graveyardPosition._getTransformedByMergeOperation( b );\n\t}\n\n\treturn [ a ];\n} );\n\nsetTransformation( MergeOperation, MoveOperation, ( a, b, context ) => {\n\t// Case 1:\n\t//\n\t// The element to merge got removed.\n\t//\n\t// Merge operation does support merging elements which are not siblings. So it would not be a problem\n\t// from technical point of view. However, if the element was removed, the intention of the user deleting it\n\t// was to have it all deleted, together with its children. From user experience point of view, moving back the\n\t// removed nodes might be unexpected. This means that in this scenario we will block the merging.\n\t//\n\t// The exception of this rule would be if the remove operation was later undone.\n\t//\n\tconst removedRange = Range._createFromPositionAndShift( b.sourcePosition, b.howMany );\n\n\tif ( b.type == 'remove' && !context.bWasUndone && !context.forceWeakRemove ) {\n\t\tif ( a.deletionPosition.hasSameParentAs( b.sourcePosition ) && removedRange.containsPosition( a.sourcePosition ) ) {\n\t\t\treturn [ new NoOperation( 0 ) ];\n\t\t}\n\t}\n\n\t// The default case.\n\t//\n\tif ( a.sourcePosition.hasSameParentAs( b.targetPosition ) ) {\n\t\ta.howMany += b.howMany;\n\t}\n\n\tif ( a.sourcePosition.hasSameParentAs( b.sourcePosition ) ) {\n\t\ta.howMany -= b.howMany;\n\t}\n\n\ta.sourcePosition = a.sourcePosition._getTransformedByMoveOperation( b );\n\ta.targetPosition = a.targetPosition._getTransformedByMoveOperation( b );\n\n\t// `MergeOperation` graveyard position is like `MoveOperation` target position. It is a position where element(s) will\n\t// be moved. Like in other similar cases, we need to consider the scenario when those positions are same.\n\t// Here, we will treat `MergeOperation` like it is always strong (see `InsertOperation` x `InsertOperation` for comparison).\n\t// This means that we won't transform graveyard position if it is equal to move operation target position.\n\tif ( !a.graveyardPosition.isEqual( b.targetPosition ) ) {\n\t\ta.graveyardPosition = a.graveyardPosition._getTransformedByMoveOperation( b );\n\t}\n\n\treturn [ a ];\n} );\n\nsetTransformation( MergeOperation, SplitOperation, ( a, b, context ) => {\n\tif ( b.graveyardPosition ) {\n\t\t// If `b` operation defines graveyard position, a node from graveyard will be moved. This means that we need to\n\t\t// transform `a.graveyardPosition` accordingly.\n\t\ta.graveyardPosition = a.graveyardPosition._getTransformedByDeletion( b.graveyardPosition, 1 );\n\n\t\t// This is a scenario foreseen in `MergeOperation` x `MergeOperation`, with two identical merge operations.\n\t\t//\n\t\t// So, there was `MergeOperation` x `MergeOperation` transformation earlier. Now, `a` is a merge operation which\n\t\t// source position is in graveyard. Interestingly, split operation wants to use the node to be merged by `a`. This\n\t\t// means that `b` is undoing that merge operation from earlier, which caused `a` to be in graveyard.\n\t\t//\n\t\t// If that's the case, at this point, we will only \"fix\" `a.howMany`. It was earlier set to `0` in\n\t\t// `MergeOperation` x `MergeOperation` transformation. Later transformations in this function will change other\n\t\t// properties.\n\t\t//\n\t\tif ( a.deletionPosition.isEqual( b.graveyardPosition ) ) {\n\t\t\ta.howMany = b.howMany;\n\t\t}\n\t}\n\n\t// Case 1:\n\t//\n\t// Merge operation moves nodes to the place where split happens.\n\t// This is a classic situation when there are two paragraphs, and there is a split (enter) after the first\n\t// paragraph and there is a merge (delete) at the beginning of the second paragraph:\n\t//\n\t// <p>Foo{}</p><p>[]Bar</p>.\n\t//\n\t// Split is after `Foo`, while merge is from `Bar` to the end of `Foo`.\n\t//\n\t// State after split:\n\t// <p>Foo</p><p></p><p>Bar</p>\n\t//\n\t// Now, `Bar` should be merged to the new paragraph:\n\t// <p>Foo</p><p>Bar</p>\n\t//\n\t// Instead of merging it to the original paragraph:\n\t// <p>FooBar</p><p></p>\n\t//\n\t// This means that `targetPosition` needs to be transformed. This is the default case though.\n\t// For example, if the split would be after `F`, `targetPosition` should also be transformed.\n\t//\n\t// There are three exceptions, though, when we want to keep `targetPosition` as it was.\n\t//\n\t// First exception is when the merge target position is inside an element (not at the end, as usual). This\n\t// happens when the merge operation earlier was transformed by \"the same\" merge operation. If merge operation\n\t// targets inside the element we want to keep the original target position (and not transform it) because\n\t// we have additional context telling us that we want to merge to the original element. We can check if the\n\t// merge operation points inside element by checking what is `SplitOperation#howMany`. Since merge target position\n\t// is same as split position, if `howMany` is non-zero, it means that the merge target position is inside an element.\n\t//\n\t// Second exception is when the element to merge is in the graveyard and split operation uses it. In that case\n\t// if target position would be transformed, the merge operation would target at the source position:\n\t//\n\t// root: <p>Foo</p>\t\t\t\tgraveyard: <p></p>\n\t//\n\t// SplitOperation: root [ 0, 3 ] using graveyard [ 0 ] (howMany = 0)\n\t// MergeOperation: graveyard [ 0, 0 ] -> root [ 0, 3 ] (howMany = 0)\n\t//\n\t// Since split operation moves the graveyard node back to the root, the merge operation source position changes.\n\t// We would like to merge from the empty <p> to the \"Foo\" <p>:\n\t//\n\t// root: <p>Foo</p><p></p>\t\t\tgraveyard:\n\t//\n\t// MergeOperation#sourcePosition = root [ 1, 0 ]\n\t//\n\t// If `targetPosition` is transformed, it would become root [ 1, 0 ] as well. It has to be kept as it was.\n\t//\n\t// Third exception is connected with relations. If this happens during undo and we have explicit information\n\t// that target position has not been affected by the operation which is undone by this split then this split should\n\t// not move the target position either.\n\t//\n\tif ( a.targetPosition.isEqual( b.splitPosition ) ) {\n\t\tconst mergeInside = b.howMany != 0;\n\t\tconst mergeSplittingElement = b.graveyardPosition && a.deletionPosition.isEqual( b.graveyardPosition );\n\n\t\tif ( mergeInside || mergeSplittingElement || context.abRelation == 'mergeTargetNotMoved' ) {\n\t\t\ta.sourcePosition = a.sourcePosition._getTransformedBySplitOperation( b );\n\n\t\t\treturn [ a ];\n\t\t}\n\t}\n\n\t// Case 2:\n\t//\n\t// Merge source is at the same position as split position. This sometimes happen, mostly during undo.\n\t// The decision here is mostly to choose whether merge source position should stay where it is (so it will be at the end of the\n\t// split element) or should be move to the beginning of the new element.\n\t//\n\tif ( a.sourcePosition.isEqual( b.splitPosition ) ) {\n\t\t// Use context to check if `SplitOperation` is not undoing a merge operation, that didn't change the `a` operation.\n\t\t// This scenario happens the undone merge operation moved nodes at the source position of `a` operation.\n\t\t// In that case `a` operation source position should stay where it is.\n\t\tif ( context.abRelation == 'mergeSourceNotMoved' ) {\n\t\t\ta.howMany = 0;\n\t\t\ta.targetPosition = a.targetPosition._getTransformedBySplitOperation( b );\n\n\t\t\treturn [ a ];\n\t\t}\n\n\t\t// This merge operation might have been earlier transformed by a merge operation which both merged the same element.\n\t\t// See that case in `MergeOperation` x `MergeOperation` transformation. In that scenario, if the merge operation has been undone,\n\t\t// the special case is not applied.\n\t\t//\n\t\t// Now, the merge operation is transformed by the split which has undone that previous merge operation.\n\t\t// So now we are fixing situation which was skipped in `MergeOperation` x `MergeOperation` case.\n\t\t//\n\t\tif ( context.abRelation == 'mergeSameElement' || a.sourcePosition.offset > 0 ) {\n\t\t\ta.sourcePosition = b.moveTargetPosition.clone();\n\t\t\ta.targetPosition = a.targetPosition._getTransformedBySplitOperation( b );\n\n\t\t\treturn [ a ];\n\t\t}\n\t}\n\n\t// The default case.\n\t//\n\tif ( a.sourcePosition.hasSameParentAs( b.splitPosition ) ) {\n\t\ta.howMany = b.splitPosition.offset;\n\t}\n\n\ta.sourcePosition = a.sourcePosition._getTransformedBySplitOperation( b );\n\ta.targetPosition = a.targetPosition._getTransformedBySplitOperation( b );\n\n\treturn [ a ];\n} );\n\n// -----------------------\n\nsetTransformation( MoveOperation, InsertOperation, ( a, b ) => {\n\tconst moveRange = Range._createFromPositionAndShift( a.sourcePosition, a.howMany );\n\tconst transformed = moveRange._getTransformedByInsertOperation( b, false )[ 0 ];\n\n\ta.sourcePosition = transformed.start;\n\ta.howMany = transformed.end.offset - transformed.start.offset;\n\n\t// See `InsertOperation` x `MoveOperation` transformation for details on this case.\n\t//\n\t// In summary, both operations point to the same place, so the order of nodes needs to be decided.\n\t// `MoveOperation` is considered weaker, so it is always transformed, unless there was a certain relation\n\t// between operations.\n\t//\n\tif ( !a.targetPosition.isEqual( b.position ) ) {\n\t\ta.targetPosition = a.targetPosition._getTransformedByInsertOperation( b );\n\t}\n\n\treturn [ a ];\n} );\n\nsetTransformation( MoveOperation, MoveOperation, ( a, b, context ) => {\n\t//\n\t// Setting and evaluating some variables that will be used in special cases and default algorithm.\n\t//\n\t// Create ranges from `MoveOperations` properties.\n\tconst rangeA = Range._createFromPositionAndShift( a.sourcePosition, a.howMany );\n\tconst rangeB = Range._createFromPositionAndShift( b.sourcePosition, b.howMany );\n\n\t// Assign `context.aIsStrong` to a different variable, because the value may change during execution of\n\t// this algorithm and we do not want to override original `context.aIsStrong` that will be used in later transformations.\n\tlet aIsStrong = context.aIsStrong;\n\n\t// This will be used to decide the order of nodes if both operations target at the same position.\n\t// By default, use strong/weak operation mechanism.\n\tlet insertBefore = !context.aIsStrong;\n\n\t// If the relation is set, then use it to decide nodes order.\n\tif ( context.abRelation == 'insertBefore' || context.baRelation == 'insertAfter' ) {\n\t\tinsertBefore = true;\n\t} else if ( context.abRelation == 'insertAfter' || context.baRelation == 'insertBefore' ) {\n\t\tinsertBefore = false;\n\t}\n\n\t// `a.targetPosition` could be affected by the `b` operation. We will transform it.\n\tlet newTargetPosition;\n\n\tif ( a.targetPosition.isEqual( b.targetPosition ) && insertBefore ) {\n\t\tnewTargetPosition = a.targetPosition._getTransformedByDeletion(\n\t\t\tb.sourcePosition,\n\t\t\tb.howMany\n\t\t);\n\t} else {\n\t\tnewTargetPosition = a.targetPosition._getTransformedByMove(\n\t\t\tb.sourcePosition,\n\t\t\tb.targetPosition,\n\t\t\tb.howMany\n\t\t);\n\t}\n\n\t//\n\t// Special case #1 + mirror.\n\t//\n\t// Special case when both move operations' target positions are inside nodes that are\n\t// being moved by the other move operation. So in other words, we move ranges into inside of each other.\n\t// This case can't be solved reasonably (on the other hand, it should not happen often).\n\tif ( _moveTargetIntoMovedRange( a, b ) && _moveTargetIntoMovedRange( b, a ) ) {\n\t\t// Instead of transforming operation, we return a reverse of the operation that we transform by.\n\t\t// So when the results of this \"transformation\" will be applied, `b` MoveOperation will get reversed.\n\t\treturn [ b.getReversed() ];\n\t}\n\t//\n\t// End of special case #1.\n\t//\n\n\t//\n\t// Special case #2.\n\t//\n\t// Check if `b` operation targets inside `rangeA`.\n\tconst bTargetsToA = rangeA.containsPosition( b.targetPosition );\n\n\t// If `b` targets to `rangeA` and `rangeA` contains `rangeB`, `b` operation has no influence on `a` operation.\n\t// You might say that operation `b` is captured inside operation `a`.\n\tif ( bTargetsToA && rangeA.containsRange( rangeB, true ) ) {\n\t\t// There is a mini-special case here, where `rangeB` is on other level than `rangeA`. That's why\n\t\t// we need to transform `a` operation anyway.\n\t\trangeA.start = rangeA.start._getTransformedByMove( b.sourcePosition, b.targetPosition, b.howMany );\n\t\trangeA.end = rangeA.end._getTransformedByMove( b.sourcePosition, b.targetPosition, b.howMany );\n\n\t\treturn _makeMoveOperationsFromRanges( [ rangeA ], newTargetPosition );\n\t}\n\n\t//\n\t// Special case #2 mirror.\n\t//\n\tconst aTargetsToB = rangeB.containsPosition( a.targetPosition );\n\n\tif ( aTargetsToB && rangeB.containsRange( rangeA, true ) ) {\n\t\t// `a` operation is \"moved together\" with `b` operation.\n\t\t// Here, just move `rangeA` \"inside\" `rangeB`.\n\t\trangeA.start = rangeA.start._getCombined( b.sourcePosition, b.getMovedRangeStart() );\n\t\trangeA.end = rangeA.end._getCombined( b.sourcePosition, b.getMovedRangeStart() );\n\n\t\treturn _makeMoveOperationsFromRanges( [ rangeA ], newTargetPosition );\n\t}\n\t//\n\t// End of special case #2.\n\t//\n\n\t//\n\t// Special case #3 + mirror.\n\t//\n\t// `rangeA` has a node which is an ancestor of `rangeB`. In other words, `rangeB` is inside `rangeA`\n\t// but not on the same tree level. In such case ranges have common part but we have to treat it\n\t// differently, because in such case those ranges are not really conflicting and should be treated like\n\t// two separate ranges. Also we have to discard two difference parts.\n\tconst aCompB = compareArrays( a.sourcePosition.getParentPath(), b.sourcePosition.getParentPath() );\n\n\tif ( aCompB == 'prefix' || aCompB == 'extension' ) {\n\t\t// Transform `rangeA` by `b` operation and make operation out of it, and that's all.\n\t\t// Note that this is a simplified version of default case, but here we treat the common part (whole `rangeA`)\n\t\t// like a one difference part.\n\t\trangeA.start = rangeA.start._getTransformedByMove( b.sourcePosition, b.targetPosition, b.howMany );\n\t\trangeA.end = rangeA.end._getTransformedByMove( b.sourcePosition, b.targetPosition, b.howMany );\n\n\t\treturn _makeMoveOperationsFromRanges( [ rangeA ], newTargetPosition );\n\t}\n\t//\n\t// End of special case #3.\n\t//\n\n\t//\n\t// Default case - ranges are on the same level or are not connected with each other.\n\t//\n\t// Modifier for default case.\n\t// Modifies `aIsStrong` flag in certain conditions.\n\t//\n\t// If only one of operations is a remove operation, we force remove operation to be the \"stronger\" one\n\t// to provide more expected results.\n\tif ( a.type == 'remove' && b.type != 'remove' && !context.aWasUndone && !context.forceWeakRemove ) {\n\t\taIsStrong = true;\n\t} else if ( a.type != 'remove' && b.type == 'remove' && !context.bWasUndone && !context.forceWeakRemove ) {\n\t\taIsStrong = false;\n\t}\n\n\t// Handle operation's source ranges - check how `rangeA` is affected by `b` operation.\n\t// This will aggregate transformed ranges.\n\tconst ranges = [];\n\n\t// Get the \"difference part\" of `a` operation source range.\n\t// This is an array with one or two ranges. Two ranges if `rangeB` is inside `rangeA`.\n\tconst difference = rangeA.getDifference( rangeB );\n\n\tfor ( const range of difference ) {\n\t\t// Transform those ranges by `b` operation. For example if `b` moved range from before those ranges, fix those ranges.\n\t\trange.start = range.start._getTransformedByDeletion( b.sourcePosition, b.howMany );\n\t\trange.end = range.end._getTransformedByDeletion( b.sourcePosition, b.howMany );\n\n\t\t// If `b` operation targets into `rangeA` on the same level, spread `rangeA` into two ranges.\n\t\tconst shouldSpread = compareArrays( range.start.getParentPath(), b.getMovedRangeStart().getParentPath() ) == 'same';\n\t\tconst newRanges = range._getTransformedByInsertion( b.getMovedRangeStart(), b.howMany, shouldSpread );\n\n\t\tranges.push( ...newRanges );\n\t}\n\n\t// Then, we have to manage the \"common part\" of both move ranges.\n\tconst common = rangeA.getIntersection( rangeB );\n\n\tif ( common !== null && aIsStrong ) {\n\t\t// Calculate the new position of that part of original range.\n\t\tcommon.start = common.start._getCombined( b.sourcePosition, b.getMovedRangeStart() );\n\t\tcommon.end = common.end._getCombined( b.sourcePosition, b.getMovedRangeStart() );\n\n\t\t// Take care of proper range order.\n\t\t//\n\t\t// Put `common` at appropriate place. Keep in mind that we are interested in original order.\n\t\t// Basically there are only three cases: there is zero, one or two difference ranges.\n\t\t//\n\t\t// If there is zero difference ranges, just push `common` in the array.\n\t\tif ( ranges.length === 0 ) {\n\t\t\tranges.push( common );\n\t\t}\n\t\t// If there is one difference range, we need to check whether common part was before it or after it.\n\t\telse if ( ranges.length == 1 ) {\n\t\t\tif ( rangeB.start.isBefore( rangeA.start ) || rangeB.start.isEqual( rangeA.start ) ) {\n\t\t\t\tranges.unshift( common );\n\t\t\t} else {\n\t\t\t\tranges.push( common );\n\t\t\t}\n\t\t}\n\t\t// If there are more ranges (which means two), put common part between them. This is the only scenario\n\t\t// where there could be two difference ranges so we don't have to make any comparisons.\n\t\telse {\n\t\t\tranges.splice( 1, 0, common );\n\t\t}\n\t}\n\n\tif ( ranges.length === 0 ) {\n\t\t// If there are no \"source ranges\", nothing should be changed.\n\t\t// Note that this can happen only if `aIsStrong == false` and `rangeA.isEqual( rangeB )`.\n\t\treturn [ new NoOperation( a.baseVersion ) ];\n\t}\n\n\treturn _makeMoveOperationsFromRanges( ranges, newTargetPosition );\n} );\n\nsetTransformation( MoveOperation, SplitOperation, ( a, b, context ) => {\n\tlet newTargetPosition = a.targetPosition.clone();\n\n\t// Do not transform if target position is same as split insertion position and this split comes from undo.\n\t// This should be done on relations but it is too much work for now as it would require relations working in collaboration.\n\t// We need to make a decision how we will resolve such conflict and this is less harmful way.\n\tif ( !a.targetPosition.isEqual( b.insertionPosition ) || !b.graveyardPosition || context.abRelation == 'moveTargetAfter' ) {\n\t\tnewTargetPosition = a.targetPosition._getTransformedBySplitOperation( b );\n\t}\n\n\t// Case 1:\n\t//\n\t// Last element in the moved range got split.\n\t//\n\t// In this case the default range transformation will not work correctly as the element created by\n\t// split operation would be outside the range. The range to move needs to be fixed manually.\n\t//\n\tconst moveRange = Range._createFromPositionAndShift( a.sourcePosition, a.howMany );\n\n\tif ( moveRange.end.isEqual( b.insertionPosition ) ) {\n\t\t// Do it only if this is a \"natural\" split, not a one that comes from undo.\n\t\t// If this is undo split, only `targetPosition` needs to be changed (if the move is a remove).\n\t\tif ( !b.graveyardPosition ) {\n\t\t\ta.howMany++;\n\t\t}\n\n\t\ta.targetPosition = newTargetPosition;\n\n\t\treturn [ a ];\n\t}\n\n\t// Case 2:\n\t//\n\t// Split happened between the moved nodes. In this case two ranges to move need to be generated.\n\t//\n\t// Characters `ozba` are moved to the end of paragraph `Xyz` but split happened.\n\t// <p>F[oz|ba]r</p><p>Xyz</p>\n\t//\n\t// After split:\n\t// <p>F[oz</p><p>ba]r</p><p>Xyz</p>\n\t//\n\t// Correct ranges:\n\t// <p>F[oz]</p><p>[ba]r</p><p>Xyz</p>\n\t//\n\t// After move:\n\t// <p>F</p><p>r</p><p>Xyzozba</p>\n\t//\n\tif ( moveRange.start.hasSameParentAs( b.splitPosition ) && moveRange.containsPosition( b.splitPosition ) ) {\n\t\tlet rightRange = new Range( b.splitPosition, moveRange.end );\n\t\trightRange = rightRange._getTransformedBySplitOperation( b );\n\n\t\tconst ranges = [\n\t\t\tnew Range( moveRange.start, b.splitPosition ),\n\t\t\trightRange\n\t\t];\n\n\t\treturn _makeMoveOperationsFromRanges( ranges, newTargetPosition );\n\t}\n\n\t// Case 3:\n\t//\n\t// Move operation targets at the split position. We need to decide if the nodes should be inserted\n\t// at the end of the split element or at the beginning of the new element.\n\t//\n\tif ( a.targetPosition.isEqual( b.splitPosition ) && context.abRelation == 'insertAtSource' ) {\n\t\tnewTargetPosition = b.moveTargetPosition;\n\t}\n\n\t// Case 4:\n\t//\n\t// Move operation targets just after the split element. We need to decide if the nodes should be inserted\n\t// between two parts of split element, or after the new element.\n\t//\n\t// Split at `|`, while move operation moves `<p>Xyz</p>` and targets at `^`:\n\t// <p>Foo|bar</p>^<p>baz</p>\n\t// <p>Foo</p>^<p>bar</p><p>baz</p> or <p>Foo</p><p>bar</p>^<p>baz</p>?\n\t//\n\t// If there is no contextual information between operations (for example, they come from collaborative\n\t// editing), we don't want to put some unrelated content (move) between parts of related content (split parts).\n\t// However, if the split is from undo, in the past, the moved content might be targeting between the\n\t// split parts, meaning that was exactly user's intention:\n\t//\n\t// <p>Foo</p>^<p>bar</p>\t\t<--- original situation, in \"past\".\n\t// <p>Foobar</p>^\t\t\t\t<--- after merge target position is transformed.\n\t// <p>Foo|bar</p>^\t\t\t\t<--- then the merge is undone, and split happens, which leads us to current situation.\n\t//\n\t// In this case it is pretty clear that the intention was to put new paragraph between those nodes,\n\t// so we need to transform accordingly. We can detect this scenario thanks to relations.\n\t//\n\tif ( a.targetPosition.isEqual( b.insertionPosition ) && context.abRelation == 'insertBetween' ) {\n\t\tnewTargetPosition = a.targetPosition;\n\t}\n\n\t// The default case.\n\t//\n\tconst transformed = moveRange._getTransformedBySplitOperation( b );\n\tconst ranges = [ transformed ];\n\n\t// Case 5:\n\t//\n\t// Moved range contains graveyard element used by split operation. Add extra move operation to the result.\n\t//\n\tif ( b.graveyardPosition ) {\n\t\tconst movesGraveyardElement = moveRange.start.isEqual( b.graveyardPosition ) || moveRange.containsPosition( b.graveyardPosition );\n\n\t\tif ( a.howMany > 1 && movesGraveyardElement && !context.aWasUndone ) {\n\t\t\tranges.push( Range._createFromPositionAndShift( b.insertionPosition, 1 ) );\n\t\t}\n\t}\n\n\treturn _makeMoveOperationsFromRanges( ranges, newTargetPosition );\n} );\n\nsetTransformation( MoveOperation, MergeOperation, ( a, b, context ) => {\n\tconst movedRange = Range._createFromPositionAndShift( a.sourcePosition, a.howMany );\n\n\tif ( b.deletionPosition.hasSameParentAs( a.sourcePosition ) && movedRange.containsPosition( b.sourcePosition ) ) {\n\t\tif ( a.type == 'remove' && !context.forceWeakRemove ) {\n\t\t\t// Case 1:\n\t\t\t//\n\t\t\t// The element to remove got merged.\n\t\t\t//\n\t\t\t// Merge operation does support merging elements which are not siblings. So it would not be a problem\n\t\t\t// from technical point of view. However, if the element was removed, the intention of the user\n\t\t\t// deleting it was to have it all deleted. From user experience point of view, moving back the\n\t\t\t// removed nodes might be unexpected. This means that in this scenario we will reverse merging and remove the element.\n\t\t\t//\n\t\t\tif ( !context.aWasUndone ) {\n\t\t\t\tconst results = [];\n\n\t\t\t\tlet gyMoveSource = b.graveyardPosition.clone();\n\t\t\t\tlet splitNodesMoveSource = b.targetPosition._getTransformedByMergeOperation( b );\n\n\t\t\t\tif ( a.howMany > 1 ) {\n\t\t\t\t\tresults.push( new MoveOperation( a.sourcePosition, a.howMany - 1, a.targetPosition, 0 ) );\n\n\t\t\t\t\tgyMoveSource = gyMoveSource._getTransformedByMove( a.sourcePosition, a.targetPosition, a.howMany - 1 );\n\t\t\t\t\tsplitNodesMoveSource = splitNodesMoveSource._getTransformedByMove( a.sourcePosition, a.targetPosition, a.howMany - 1 );\n\t\t\t\t}\n\n\t\t\t\tconst gyMoveTarget = b.deletionPosition._getCombined( a.sourcePosition, a.targetPosition );\n\t\t\t\tconst gyMove = new MoveOperation( gyMoveSource, 1, gyMoveTarget, 0 );\n\n\t\t\t\tconst splitNodesMoveTargetPath = gyMove.getMovedRangeStart().path.slice();\n\t\t\t\tsplitNodesMoveTargetPath.push( 0 );\n\n\t\t\t\tconst splitNodesMoveTarget = new Position( gyMove.targetPosition.root, splitNodesMoveTargetPath );\n\t\t\t\tsplitNodesMoveSource = splitNodesMoveSource._getTransformedByMove( gyMoveSource, gyMoveTarget, 1 );\n\t\t\t\tconst splitNodesMove = new MoveOperation( splitNodesMoveSource, b.howMany, splitNodesMoveTarget, 0 );\n\n\t\t\t\tresults.push( gyMove );\n\t\t\t\tresults.push( splitNodesMove );\n\n\t\t\t\treturn results;\n\t\t\t}\n\t\t} else {\n\t\t\t// Case 2:\n\t\t\t//\n\t\t\t// The element to move got merged and it was the only element to move.\n\t\t\t// In this case just don't do anything, leave the node in the graveyard. Without special case\n\t\t\t// it would be a move operation that moves 0 nodes, so maybe it is better just to return no-op.\n\t\t\t//\n\t\t\tif ( a.howMany == 1 ) {\n\t\t\t\tif ( !context.bWasUndone ) {\n\t\t\t\t\treturn [ new NoOperation( 0 ) ];\n\t\t\t\t} else {\n\t\t\t\t\ta.sourcePosition = b.graveyardPosition.clone();\n\t\t\t\t\ta.targetPosition = a.targetPosition._getTransformedByMergeOperation( b );\n\n\t\t\t\t\treturn [ a ];\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\t}\n\n\t// The default case.\n\t//\n\tconst moveRange = Range._createFromPositionAndShift( a.sourcePosition, a.howMany );\n\tconst transformed = moveRange._getTransformedByMergeOperation( b );\n\n\ta.sourcePosition = transformed.start;\n\ta.howMany = transformed.end.offset - transformed.start.offset;\n\ta.targetPosition = a.targetPosition._getTransformedByMergeOperation( b );\n\n\treturn [ a ];\n} );\n\n// -----------------------\n\nsetTransformation( RenameOperation, InsertOperation, ( a, b ) => {\n\ta.position = a.position._getTransformedByInsertOperation( b );\n\n\treturn [ a ];\n} );\n\nsetTransformation( RenameOperation, MergeOperation, ( a, b ) => {\n\t// Case 1:\n\t//\n\t// Element to rename got merged, so it was moved to `b.graveyardPosition`.\n\t//\n\tif ( a.position.isEqual( b.deletionPosition ) ) {\n\t\ta.position = b.graveyardPosition.clone();\n\t\ta.position.stickiness = 'toNext';\n\n\t\treturn [ a ];\n\t}\n\n\ta.position = a.position._getTransformedByMergeOperation( b );\n\n\treturn [ a ];\n} );\n\nsetTransformation( RenameOperation, MoveOperation, ( a, b ) => {\n\ta.position = a.position._getTransformedByMoveOperation( b );\n\n\treturn [ a ];\n} );\n\nsetTransformation( RenameOperation, RenameOperation, ( a, b, context ) => {\n\tif ( a.position.isEqual( b.position ) ) {\n\t\tif ( context.aIsStrong ) {\n\t\t\ta.oldName = b.newName;\n\t\t} else {\n\t\t\treturn [ new NoOperation( 0 ) ];\n\t\t}\n\t}\n\n\treturn [ a ];\n} );\n\nsetTransformation( RenameOperation, SplitOperation, ( a, b ) => {\n\t// Case 1:\n\t//\n\t// The element to rename has been split. In this case, the new element should be also renamed.\n\t//\n\t// User decides to change the paragraph to a list item:\n\t// <paragraph>Foobar</paragraph>\n\t//\n\t// However, in meantime, split happens:\n\t// <paragraph>Foo</paragraph><paragraph>bar</paragraph>\n\t//\n\t// As a result, rename both elements:\n\t// <listItem>Foo</listItem><listItem>bar</listItem>\n\t//\n\tconst renamePath = a.position.path;\n\tconst splitPath = b.splitPosition.getParentPath();\n\n\tif ( compareArrays( renamePath, splitPath ) == 'same' && !b.graveyardPosition ) {\n\t\tconst extraRename = new RenameOperation( a.position.getShiftedBy( 1 ), a.oldName, a.newName, 0 );\n\n\t\treturn [ a, extraRename ];\n\t}\n\n\t// The default case.\n\t//\n\ta.position = a.position._getTransformedBySplitOperation( b );\n\n\treturn [ a ];\n} );\n\n// -----------------------\n\nsetTransformation( RootAttributeOperation, RootAttributeOperation, ( a, b, context ) => {\n\tif ( a.root === b.root && a.key === b.key ) {\n\t\tif ( !context.aIsStrong || a.newValue === b.newValue ) {\n\t\t\treturn [ new NoOperation( 0 ) ];\n\t\t} else {\n\t\t\ta.oldValue = b.newValue;\n\t\t}\n\t}\n\n\treturn [ a ];\n} );\n\n// -----------------------\n\nsetTransformation( SplitOperation, InsertOperation, ( a, b ) => {\n\t// The default case.\n\t//\n\tif ( a.splitPosition.hasSameParentAs( b.position ) && a.splitPosition.offset < b.position.offset ) {\n\t\ta.howMany += b.howMany;\n\t}\n\n\ta.splitPosition = a.splitPosition._getTransformedByInsertOperation( b );\n\ta.insertionPosition = SplitOperation.getInsertionPosition( a.splitPosition );\n\n\treturn [ a ];\n} );\n\nsetTransformation( SplitOperation, MergeOperation, ( a, b, context ) => {\n\t// Case 1:\n\t//\n\t// Split element got merged. If two different elements were merged, clients will have different content.\n\t//\n\t// Example. Merge at `{}`, split at `[]`:\n\t// <heading>Foo</heading>{}<paragraph>B[]ar</paragraph>\n\t//\n\t// On merge side it will look like this:\n\t// <heading>FooB[]ar</heading>\n\t// <heading>FooB</heading><heading>ar</heading>\n\t//\n\t// On split side it will look like this:\n\t// <heading>Foo</heading>{}<paragraph>B</paragraph><paragraph>ar</paragraph>\n\t// <heading>FooB</heading><paragraph>ar</paragraph>\n\t//\n\t// Clearly, the second element is different for both clients.\n\t//\n\t// We could use the removed merge element from graveyard as a split element but then clients would have a different\n\t// model state (in graveyard), because the split side client would still have an element in graveyard (removed by merge).\n\t//\n\t// To overcome this, in `SplitOperation` x `MergeOperation` transformation we will add additional `SplitOperation`\n\t// in the graveyard, which will actually clone the merged-and-deleted element. Then, that cloned element will be\n\t// used for splitting. Example below.\n\t//\n\t// Original state:\n\t// <heading>Foo</heading>{}<paragraph>B[]ar</paragraph>\n\t//\n\t// Merge side client:\n\t//\n\t// After merge:\n\t// <heading>FooB[]ar</heading>                                 graveyard: <paragraph></paragraph>\n\t//\n\t// Extra split:\n\t// <heading>FooB[]ar</heading>                                 graveyard: <paragraph></paragraph><paragraph></paragraph>\n\t//\n\t// Use the \"cloned\" element from graveyard:\n\t// <heading>FooB</heading><paragraph>ar</paragraph>            graveyard: <paragraph></paragraph>\n\t//\n\t// Split side client:\n\t//\n\t// After split:\n\t// <heading>Foo</heading>{}<paragraph>B</paragraph><paragraph>ar</paragraph>\n\t//\n\t// After merge:\n\t// <heading>FooB</heading><paragraph>ar</paragraph>            graveyard: <paragraph></paragraph>\n\t//\n\t// This special case scenario only applies if the original split operation clones the split element.\n\t// If the original split operation has `graveyardPosition` set, it all doesn't have sense because split operation\n\t// knows exactly which element it should use. So there would be no original problem with different contents.\n\t//\n\t// Additionally, the special case applies only if the merge wasn't already undone.\n\t//\n\tif ( !a.graveyardPosition && !context.bWasUndone && a.splitPosition.hasSameParentAs( b.sourcePosition ) ) {\n\t\tconst splitPath = b.graveyardPosition.path.slice();\n\t\tsplitPath.push( 0 );\n\n\t\tconst splitPosition = new Position( b.graveyardPosition.root, splitPath );\n\t\tconst insertionPosition = SplitOperation.getInsertionPosition( new Position( b.graveyardPosition.root, splitPath ) );\n\n\t\tconst additionalSplit = new SplitOperation( splitPosition, 0, null, 0 );\n\t\tadditionalSplit.insertionPosition = insertionPosition;\n\n\t\ta.splitPosition = a.splitPosition._getTransformedByMergeOperation( b );\n\t\ta.insertionPosition = SplitOperation.getInsertionPosition( a.splitPosition );\n\t\ta.graveyardPosition = additionalSplit.insertionPosition.clone();\n\t\ta.graveyardPosition.stickiness = 'toNext';\n\n\t\treturn [ additionalSplit, a ];\n\t}\n\n\t// The default case.\n\t//\n\tif ( a.splitPosition.hasSameParentAs( b.deletionPosition ) && !a.splitPosition.isAfter( b.deletionPosition ) ) {\n\t\ta.howMany--;\n\t}\n\n\tif ( a.splitPosition.hasSameParentAs( b.targetPosition ) ) {\n\t\ta.howMany += b.howMany;\n\t}\n\n\ta.splitPosition = a.splitPosition._getTransformedByMergeOperation( b );\n\ta.insertionPosition = SplitOperation.getInsertionPosition( a.splitPosition );\n\n\tif ( a.graveyardPosition ) {\n\t\ta.graveyardPosition = a.graveyardPosition._getTransformedByMergeOperation( b );\n\t}\n\n\treturn [ a ];\n} );\n\nsetTransformation( SplitOperation, MoveOperation, ( a, b, context ) => {\n\tconst rangeToMove = Range._createFromPositionAndShift( b.sourcePosition, b.howMany );\n\n\tif ( a.graveyardPosition ) {\n\t\t// Case 1:\n\t\t//\n\t\t// Split operation graveyard node was moved. In this case move operation is stronger. Since graveyard element\n\t\t// is already moved to the correct position, we need to only move the nodes after the split position.\n\t\t// This will be done by `MoveOperation` instead of `SplitOperation`.\n\t\t//\n\t\tconst gyElementMoved = rangeToMove.start.isEqual( a.graveyardPosition ) || rangeToMove.containsPosition( a.graveyardPosition );\n\n\t\tif ( !context.bWasUndone && gyElementMoved ) {\n\t\t\tconst sourcePosition = a.splitPosition._getTransformedByMoveOperation( b );\n\n\t\t\tconst newParentPosition = a.graveyardPosition._getTransformedByMoveOperation( b );\n\t\t\tconst newTargetPath = newParentPosition.path.slice();\n\t\t\tnewTargetPath.push( 0 );\n\n\t\t\tconst newTargetPosition = new Position( newParentPosition.root, newTargetPath );\n\t\t\tconst moveOp = new MoveOperation( sourcePosition, a.howMany, newTargetPosition, 0 );\n\n\t\t\treturn [ moveOp ];\n\t\t}\n\n\t\ta.graveyardPosition = a.graveyardPosition._getTransformedByMoveOperation( b );\n\t}\n\n\t// Case 2:\n\t//\n\t// If the split position is inside the moved range, we need to shift the split position to a proper place.\n\t// The position cannot be moved together with moved range because that would result in splitting of an incorrect element.\n\t//\n\t// Characters `bc` should be moved to the second paragraph while split position is between them:\n\t// <paragraph>A[b|c]d</paragraph><paragraph>Xyz</paragraph>\n\t//\n\t// After move, new split position is incorrect:\n\t// <paragraph>Ad</paragraph><paragraph>Xb|cyz</paragraph>\n\t//\n\t// Correct split position:\n\t// <paragraph>A|d</paragraph><paragraph>Xbcyz</paragraph>\n\t//\n\t// After split:\n\t// <paragraph>A</paragraph><paragraph>d</paragraph><paragraph>Xbcyz</paragraph>\n\t//\n\tif ( a.splitPosition.hasSameParentAs( b.sourcePosition ) && rangeToMove.containsPosition( a.splitPosition ) ) {\n\t\tconst howManyRemoved = b.howMany - ( a.splitPosition.offset - b.sourcePosition.offset );\n\t\ta.howMany -= howManyRemoved;\n\n\t\tif ( a.splitPosition.hasSameParentAs( b.targetPosition ) && a.splitPosition.offset < b.targetPosition.offset ) {\n\t\t\ta.howMany += b.howMany;\n\t\t}\n\n\t\ta.splitPosition = b.sourcePosition.clone();\n\t\ta.insertionPosition = SplitOperation.getInsertionPosition( a.splitPosition );\n\n\t\treturn [ a ];\n\t}\n\n\t// Case 3:\n\t//\n\t// Split is at a position where nodes were moved.\n\t//\n\t// This is a scenario described in `MoveOperation` x `SplitOperation` transformation but from the\n\t// \"split operation point of view\".\n\t//\n\tconst splitAtTarget = a.splitPosition.isEqual( b.targetPosition );\n\n\tif ( splitAtTarget && ( context.baRelation == 'insertAtSource' || context.abRelation == 'splitBefore' ) ) {\n\t\ta.howMany += b.howMany;\n\t\ta.splitPosition = a.splitPosition._getTransformedByDeletion( b.sourcePosition, b.howMany );\n\t\ta.insertionPosition = SplitOperation.getInsertionPosition( a.splitPosition );\n\n\t\treturn [ a ];\n\t}\n\n\t// The default case.\n\t// Don't change `howMany` if move operation does not really move anything.\n\t//\n\tif ( !b.sourcePosition.isEqual( b.targetPosition ) ) {\n\t\tif ( a.splitPosition.hasSameParentAs( b.sourcePosition ) && a.splitPosition.offset <= b.sourcePosition.offset ) {\n\t\t\ta.howMany -= b.howMany;\n\t\t}\n\n\t\tif ( a.splitPosition.hasSameParentAs( b.targetPosition ) && a.splitPosition.offset < b.targetPosition.offset ) {\n\t\t\ta.howMany += b.howMany;\n\t\t}\n\t}\n\n\t// Change position stickiness to force a correct transformation.\n\ta.splitPosition.stickiness = 'toNone';\n\ta.splitPosition = a.splitPosition._getTransformedByMoveOperation( b );\n\ta.splitPosition.stickiness = 'toNext';\n\n\tif ( a.graveyardPosition ) {\n\t\ta.insertionPosition = a.insertionPosition._getTransformedByMoveOperation( b );\n\t} else {\n\t\ta.insertionPosition = SplitOperation.getInsertionPosition( a.splitPosition );\n\t}\n\n\treturn [ a ];\n} );\n\nsetTransformation( SplitOperation, SplitOperation, ( a, b, context ) => {\n\t// Case 1:\n\t//\n\t// Split at the same position.\n\t//\n\t// If there already was a split at the same position as in `a` operation, it means that the intention\n\t// conveyed by `a` operation has already been fulfilled and `a` should not do anything (to avoid double split).\n\t//\n\t// However, there is a difference if these are new splits or splits created by undo. These have different\n\t// intentions. Also splits moving back different elements from graveyard have different intentions. They\n\t// are just different operations.\n\t//\n\t// So we cancel split operation only if it was really identical.\n\t//\n\t// Also, there is additional case, where split operations aren't identical and should not be cancelled, however the\n\t// default transformation is incorrect too.\n\t//\n\tif ( a.splitPosition.isEqual( b.splitPosition ) ) {\n\t\tif ( !a.graveyardPosition && !b.graveyardPosition ) {\n\t\t\treturn [ new NoOperation( 0 ) ];\n\t\t}\n\n\t\tif ( a.graveyardPosition && b.graveyardPosition && a.graveyardPosition.isEqual( b.graveyardPosition ) ) {\n\t\t\treturn [ new NoOperation( 0 ) ];\n\t\t}\n\n\t\t// Use context to know that the `a.splitPosition` should stay where it is.\n\t\t// This happens during undo when first a merge operation moved nodes to `a.splitPosition` and now `b` operation undoes that merge.\n\t\tif ( context.abRelation == 'splitBefore' ) {\n\t\t\t// Since split is at the same position, there are no nodes left to split.\n\t\t\ta.howMany = 0;\n\n\t\t\t// Note: there was `if ( a.graveyardPosition )` here but it was uncovered in tests and I couldn't find any scenarios for now.\n\t\t\t// That would have to be a `SplitOperation` that didn't come from undo but is transformed by operations that were undone.\n\t\t\t// It could happen if `context` is enabled in collaboration.\n\t\t\ta.graveyardPosition = a.graveyardPosition._getTransformedBySplitOperation( b );\n\n\t\t\treturn [ a ];\n\t\t}\n\t}\n\n\t// Case 2:\n\t//\n\t// Same node is using to split different elements. This happens in undo when previously same element was merged to\n\t// two different elements. This is described in `MergeOperation` x `MergeOperation` transformation.\n\t//\n\t// In this case we will follow the same logic. We will assume that `insertionPosition` is same for both\n\t// split operations. This might not always be true but in the real cases that were experienced it was. After all,\n\t// if these splits are reverses of merge operations that were merging the same element, then the `insertionPosition`\n\t// should be same for both of those splits.\n\t//\n\t// Again, we will decide which operation is stronger by checking if split happens in graveyard or in non-graveyard root.\n\t//\n\tif ( a.graveyardPosition && b.graveyardPosition && a.graveyardPosition.isEqual( b.graveyardPosition ) ) {\n\t\tconst aInGraveyard = a.splitPosition.root.rootName == '$graveyard';\n\t\tconst bInGraveyard = b.splitPosition.root.rootName == '$graveyard';\n\n\t\t// If `aIsWeak` it means that `a` points to graveyard while `b` doesn't. Don't move nodes then.\n\t\tconst aIsWeak = aInGraveyard && !bInGraveyard;\n\n\t\t// If `bIsWeak` it means that `b` points to graveyard while `a` doesn't. Force moving nodes then.\n\t\tconst bIsWeak = bInGraveyard && !aInGraveyard;\n\n\t\t// Force move if `b` is weak or neither operation is weak but `a` is stronger through `context.aIsStrong`.\n\t\tconst forceMove = bIsWeak || ( !aIsWeak && context.aIsStrong );\n\n\t\tif ( forceMove ) {\n\t\t\tconst result = [];\n\n\t\t\t// First we need to move any nodes split by `b` back to where they were.\n\t\t\t// Do it only if `b` actually moved something.\n\t\t\tif ( b.howMany ) {\n\t\t\t\tresult.push( new MoveOperation( b.moveTargetPosition, b.howMany, b.splitPosition, 0 ) );\n\t\t\t}\n\n\t\t\t// Then we need to move nodes from `a` split position to their new element.\n\t\t\t// Do it only if `a` actually should move something.\n\t\t\tif ( a.howMany ) {\n\t\t\t\tresult.push( new MoveOperation( a.splitPosition, a.howMany, a.moveTargetPosition, 0 ) );\n\t\t\t}\n\n\t\t\treturn result;\n\t\t} else {\n\t\t\treturn [ new NoOperation( 0 ) ];\n\t\t}\n\t}\n\n\tif ( a.graveyardPosition ) {\n\t\ta.graveyardPosition = a.graveyardPosition._getTransformedBySplitOperation( b );\n\t}\n\n\t// Case 3:\n\t//\n\t// Position where operation `b` inserted a new node after split is the same as the operation `a` split position.\n\t// As in similar cases, there is ambiguity if the split should be before the new node (created by `b`) or after.\n\t//\n\tif ( a.splitPosition.isEqual( b.insertionPosition ) && context.abRelation == 'splitBefore' ) {\n\t\ta.howMany++;\n\n\t\treturn [ a ];\n\t}\n\n\t// Case 4:\n\t//\n\t// This is a mirror to the case 2. above.\n\t//\n\tif ( b.splitPosition.isEqual( a.insertionPosition ) && context.baRelation == 'splitBefore' ) {\n\t\tconst newPositionPath = b.insertionPosition.path.slice();\n\t\tnewPositionPath.push( 0 );\n\n\t\tconst newPosition = new Position( b.insertionPosition.root, newPositionPath );\n\t\tconst moveOp = new MoveOperation( a.insertionPosition, 1, newPosition, 0 );\n\n\t\treturn [ a, moveOp ];\n\t}\n\n\t// The default case.\n\t//\n\tif ( a.splitPosition.hasSameParentAs( b.splitPosition ) && a.splitPosition.offset < b.splitPosition.offset ) {\n\t\ta.howMany -= b.howMany;\n\t}\n\n\ta.splitPosition = a.splitPosition._getTransformedBySplitOperation( b );\n\ta.insertionPosition = SplitOperation.getInsertionPosition( a.splitPosition );\n\n\treturn [ a ];\n} );\n\n// Checks whether `MoveOperation` `targetPosition` is inside a node from the moved range of the other `MoveOperation`.\n//\n// @private\n// @param {module:engine/model/operation/moveoperation~MoveOperation} a\n// @param {module:engine/model/operation/moveoperation~MoveOperation} b\n// @returns {Boolean}\nfunction _moveTargetIntoMovedRange( a, b ) {\n\treturn a.targetPosition._getTransformedByDeletion( b.sourcePosition, b.howMany ) === null;\n}\n\n// Helper function for `MoveOperation` x `MoveOperation` transformation. Converts given ranges and target position to\n// move operations and returns them.\n//\n// Ranges and target position will be transformed on-the-fly when generating operations.\n//\n// Given `ranges` should be in the order of how they were in the original transformed operation.\n//\n// Given `targetPosition` is the target position of the first range from `ranges`.\n//\n// @private\n// @param {Array.<module:engine/model/range~Range>} ranges\n// @param {module:engine/model/position~Position} targetPosition\n// @returns {Array.<module:engine/model/operation/moveoperation~MoveOperation>}\nfunction _makeMoveOperationsFromRanges( ranges, targetPosition ) {\n\t// At this moment we have some ranges and a target position, to which those ranges should be moved.\n\t// Order in `ranges` array is the go-to order of after transformation.\n\t//\n\t// We are almost done. We have `ranges` and `targetPosition` to make operations from.\n\t// Unfortunately, those operations may affect each other. Precisely, first operation after move\n\t// may affect source range and target position of second and third operation. Same with second\n\t// operation affecting third.\n\t//\n\t// We need to fix those source ranges and target positions once again, before converting `ranges` to operations.\n\tconst operations = [];\n\n\t// Keep in mind that nothing will be transformed if there is just one range in `ranges`.\n\tfor ( let i = 0; i < ranges.length; i++ ) {\n\t\t// Create new operation out of a range and target position.\n\t\tconst range = ranges[ i ];\n\t\tconst op = new MoveOperation(\n\t\t\trange.start,\n\t\t\trange.end.offset - range.start.offset,\n\t\t\ttargetPosition,\n\t\t\t0\n\t\t);\n\n\t\toperations.push( op );\n\n\t\t// Transform other ranges by the generated operation.\n\t\tfor ( let j = i + 1; j < ranges.length; j++ ) {\n\t\t\t// All ranges in `ranges` array should be:\n\t\t\t//\n\t\t\t// * non-intersecting (these are part of original operation source range), and\n\t\t\t// * `targetPosition` does not target into them (opposite would mean that transformed operation targets \"inside itself\").\n\t\t\t//\n\t\t\t// This means that the transformation will be \"clean\" and always return one result.\n\t\t\tranges[ j ] = ranges[ j ]._getTransformedByMove( op.sourcePosition, op.targetPosition, op.howMany )[ 0 ];\n\t\t}\n\n\t\ttargetPosition = targetPosition._getTransformedByMove( op.sourcePosition, op.targetPosition, op.howMany );\n\t}\n\n\treturn operations;\n}\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module undo/basecommand\n */\n\nimport Command from '@ckeditor/ckeditor5-core/src/command';\nimport { transformSets } from '@ckeditor/ckeditor5-engine/src/model/operation/transform';\n\n/**\n * Base class for undo feature commands: {@link module:undo/undocommand~UndoCommand} and {@link module:undo/redocommand~RedoCommand}.\n *\n * @protected\n * @extends module:core/command~Command\n */\nexport default class BaseCommand extends Command {\n\tconstructor( editor ) {\n\t\tsuper( editor );\n\n\t\t/**\n\t\t * Stack of items stored by the command. These are pairs of:\n\t\t *\n\t\t * * {@link module:engine/model/batch~Batch batch} saved by the command,\n\t\t * * {@link module:engine/model/selection~Selection selection} state at the moment of saving the batch.\n\t\t *\n\t\t * @protected\n\t\t * @member {Array} #_stack\n\t\t */\n\t\tthis._stack = [];\n\n\t\t/**\n\t\t * Stores all batches that were created by this command.\n\t\t *\n\t\t * @protected\n\t\t * @member {WeakSet.<module:engine/model/batch~Batch>} #_createdBatches\n\t\t */\n\t\tthis._createdBatches = new WeakSet();\n\n\t\t// Refresh state, so the command is inactive right after initialization.\n\t\tthis.refresh();\n\n\t\tthis.listenTo( editor.data, 'set', () => this.clearStack() );\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\trefresh() {\n\t\tthis.isEnabled = this._stack.length > 0;\n\t}\n\n\t/**\n\t * Stores a batch in the command, together with the selection state of the {@link module:engine/model/document~Document document}\n\t * created by the editor which this command is registered to.\n\t *\n\t * @param {module:engine/model/batch~Batch} batch The batch to add.\n\t */\n\taddBatch( batch ) {\n\t\tconst docSelection = this.editor.model.document.selection;\n\n\t\tconst selection = {\n\t\t\tranges: docSelection.hasOwnRange ? Array.from( docSelection.getRanges() ) : [],\n\t\t\tisBackward: docSelection.isBackward\n\t\t};\n\n\t\tthis._stack.push( { batch, selection } );\n\t\tthis.refresh();\n\t}\n\n\t/**\n\t * Removes all items from the stack.\n\t */\n\tclearStack() {\n\t\tthis._stack = [];\n\t\tthis.refresh();\n\t}\n\n\t/**\n\t * Restores the {@link module:engine/model/document~Document#selection document selection} state after a batch was undone.\n\t *\n\t * @protected\n\t * @param {Array.<module:engine/model/range~Range>} ranges Ranges to be restored.\n\t * @param {Boolean} isBackward A flag describing whether the restored range was selected forward or backward.\n\t * @param {Array.<module:engine/model/operation/operation~Operation>} operations Operations which has been applied\n\t * since selection has been stored.\n\t */\n\t_restoreSelection( ranges, isBackward, operations ) {\n\t\tconst model = this.editor.model;\n\t\tconst document = model.document;\n\n\t\t// This will keep the transformed selection ranges.\n\t\tconst selectionRanges = [];\n\n\t\t// Transform all ranges from the restored selection.\n\t\tconst transformedRangeGroups = ranges.map( range => range.getTransformedByOperations( operations ) );\n\t\tconst allRanges = transformedRangeGroups.flat();\n\n\t\tfor ( const rangeGroup of transformedRangeGroups ) {\n\t\t\t// While transforming there could appear ranges that are contained by other ranges, we shall ignore them.\n\t\t\tconst transformed = rangeGroup\n\t\t\t\t.filter( range => range.root != document.graveyard )\n\t\t\t\t.filter( range => !isRangeContainedByAnyOtherRange( range, allRanges ) );\n\n\t\t\t// All the transformed ranges ended up in graveyard.\n\t\t\tif ( !transformed.length ) {\n\t\t\t\tcontinue;\n\t\t\t}\n\n\t\t\t// After the range got transformed, we have an array of ranges. Some of those\n\t\t\t// ranges may be \"touching\" -- they can be next to each other and could be merged.\n\t\t\tnormalizeRanges( transformed );\n\n\t\t\t// For each `range` from `ranges`, we take only one transformed range.\n\t\t\t// This is because we want to prevent situation where single-range selection\n\t\t\t// got transformed to multi-range selection.\n\t\t\tselectionRanges.push( transformed[ 0 ] );\n\t\t}\n\n\t\t// @if CK_DEBUG_ENGINE // console.log( `Restored selection by undo: ${ selectionRanges.join( ', ' ) }` );\n\n\t\t// `selectionRanges` may be empty if all ranges ended up in graveyard. If that is the case, do not restore selection.\n\t\tif ( selectionRanges.length ) {\n\t\t\tmodel.change( writer => {\n\t\t\t\twriter.setSelection( selectionRanges, { backward: isBackward } );\n\t\t\t} );\n\t\t}\n\t}\n\n\t/**\n\t * Undoes a batch by reversing that batch, transforming reversed batch and finally applying it.\n\t * This is a helper method for {@link #execute}.\n\t *\n\t * @protected\n\t * @param {module:engine/model/batch~Batch} batchToUndo The batch to be undone.\n\t * @param {module:engine/model/batch~Batch} undoingBatch The batch that will contain undoing changes.\n\t */\n\t_undo( batchToUndo, undoingBatch ) {\n\t\tconst model = this.editor.model;\n\t\tconst document = model.document;\n\n\t\t// All changes done by the command execution will be saved as one batch.\n\t\tthis._createdBatches.add( undoingBatch );\n\n\t\tconst operationsToUndo = batchToUndo.operations.slice().filter( operation => operation.isDocumentOperation );\n\t\toperationsToUndo.reverse();\n\n\t\t// We will process each operation from `batchToUndo`, in reverse order. If there were operations A, B and C in undone batch,\n\t\t// we need to revert them in reverse order, so first C' (reversed C), then B', then A'.\n\t\tfor ( const operationToUndo of operationsToUndo ) {\n\t\t\tconst nextBaseVersion = operationToUndo.baseVersion + 1;\n\t\t\tconst historyOperations = Array.from( document.history.getOperations( nextBaseVersion ) );\n\n\t\t\tconst transformedSets = transformSets(\n\t\t\t\t[ operationToUndo.getReversed() ],\n\t\t\t\thistoryOperations,\n\t\t\t\t{\n\t\t\t\t\tuseRelations: true,\n\t\t\t\t\tdocument: this.editor.model.document,\n\t\t\t\t\tpadWithNoOps: false,\n\t\t\t\t\tforceWeakRemove: true\n\t\t\t\t}\n\t\t\t);\n\n\t\t\tconst reversedOperations = transformedSets.operationsA;\n\n\t\t\t// After reversed operation has been transformed by all history operations, apply it.\n\t\t\tfor ( const operation of reversedOperations ) {\n\t\t\t\t// Before applying, add the operation to the `undoingBatch`.\n\t\t\t\tundoingBatch.addOperation( operation );\n\t\t\t\tmodel.applyOperation( operation );\n\n\t\t\t\tdocument.history.setOperationAsUndone( operationToUndo, operation );\n\t\t\t}\n\t\t}\n\t}\n}\n\n// Normalizes list of ranges by joining intersecting or \"touching\" ranges.\n//\n// @param {Array.<module:engine/model/range~Range>} ranges\n//\nfunction normalizeRanges( ranges ) {\n\tranges.sort( ( a, b ) => a.start.isBefore( b.start ) ? -1 : 1 );\n\n\tfor ( let i = 1; i < ranges.length; i++ ) {\n\t\tconst previousRange = ranges[ i - 1 ];\n\t\tconst joinedRange = previousRange.getJoined( ranges[ i ], true );\n\n\t\tif ( joinedRange ) {\n\t\t\t// Replace the ranges on the list with the new joined range.\n\t\t\ti--;\n\t\t\tranges.splice( i, 2, joinedRange );\n\t\t}\n\t}\n}\n\nfunction isRangeContainedByAnyOtherRange( range, ranges ) {\n\treturn ranges.some( otherRange => otherRange !== range && otherRange.containsRange( range, true ) );\n}\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module undo/undocommand\n */\n\nimport BaseCommand from './basecommand';\n\n/**\n * The undo command stores {@link module:engine/model/batch~Batch batches} applied to the\n * {@link module:engine/model/document~Document document} and is able to undo a batch by reversing it and transforming by\n * batches from {@link module:engine/model/document~Document#history history} that happened after the reversed batch.\n *\n * The undo command also takes care of restoring the {@link module:engine/model/document~Document#selection document selection}.\n *\n * @extends module:undo/basecommand~BaseCommand\n */\nexport default class UndoCommand extends BaseCommand {\n\t/**\n\t * Executes the command. This method reverts a {@link module:engine/model/batch~Batch batch} added to the command's stack, transforms\n\t * and applies the reverted version on the {@link module:engine/model/document~Document document} and removes the batch from the stack.\n\t * Then, it restores the {@link module:engine/model/document~Document#selection document selection}.\n\t *\n\t * @fires execute\n\t * @fires revert\n\t * @param {module:engine/model/batch~Batch} [batch] A batch that should be undone. If not set, the last added batch will be undone.\n\t */\n\texecute( batch = null ) {\n\t\t// If batch is not given, set `batchIndex` to the last index in command stack.\n\t\tconst batchIndex = batch ? this._stack.findIndex( a => a.batch == batch ) : this._stack.length - 1;\n\n\t\tconst item = this._stack.splice( batchIndex, 1 )[ 0 ];\n\t\tconst undoingBatch = this.editor.model.createBatch( 'transparent' );\n\n\t\t// All changes has to be done in one `enqueueChange` callback so other listeners will not\n\t\t// step between consecutive operations, or won't do changes to the document before selection is properly restored.\n\t\tthis.editor.model.enqueueChange( undoingBatch, () => {\n\t\t\tthis._undo( item.batch, undoingBatch );\n\n\t\t\tconst operations = this.editor.model.document.history.getOperations( item.batch.baseVersion );\n\t\t\tthis._restoreSelection( item.selection.ranges, item.selection.isBackward, operations );\n\n\t\t\tthis.fire( 'revert', item.batch, undoingBatch );\n\t\t} );\n\n\t\tthis.refresh();\n\t}\n}\n\n/**\n * Fired when execution of the command reverts some batch.\n *\n * @event revert\n */\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module undo/redocommand\n */\n\nimport BaseCommand from './basecommand';\n\n/**\n * The redo command stores {@link module:engine/model/batch~Batch batches} that were used to undo a batch by\n * {@link module:undo/undocommand~UndoCommand}. It is able to redo a previously undone batch by reversing the undoing\n * batches created by `UndoCommand`. The reversed batch is transformed by all the batches from\n * {@link module:engine/model/document~Document#history history} that happened after the reversed undo batch.\n *\n * The redo command also takes care of restoring the {@link module:engine/model/document~Document#selection document selection}.\n *\n * @extends module:undo/basecommand~BaseCommand\n */\nexport default class RedoCommand extends BaseCommand {\n\t/**\n\t * Executes the command. This method reverts the last {@link module:engine/model/batch~Batch batch} added to\n\t * the command's stack, applies the reverted and transformed version on the\n\t * {@link module:engine/model/document~Document document} and removes the batch from the stack.\n\t * Then, it restores the {@link module:engine/model/document~Document#selection document selection}.\n\t *\n\t * @fires execute\n\t */\n\texecute() {\n\t\tconst item = this._stack.pop();\n\t\tconst redoingBatch = this.editor.model.createBatch( 'transparent' );\n\n\t\t// All changes have to be done in one `enqueueChange` callback so other listeners will not step between consecutive\n\t\t// operations, or won't do changes to the document before selection is properly restored.\n\t\tthis.editor.model.enqueueChange( redoingBatch, () => {\n\t\t\tconst lastOperation = item.batch.operations[ item.batch.operations.length - 1 ];\n\t\t\tconst nextBaseVersion = lastOperation.baseVersion + 1;\n\t\t\tconst operations = this.editor.model.document.history.getOperations( nextBaseVersion );\n\n\t\t\tthis._restoreSelection( item.selection.ranges, item.selection.isBackward, operations );\n\t\t\tthis._undo( item.batch, redoingBatch );\n\t\t} );\n\n\t\tthis.refresh();\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module undo/undoediting\n */\n\nimport Plugin from '@ckeditor/ckeditor5-core/src/plugin';\nimport UndoCommand from './undocommand';\nimport RedoCommand from './redocommand';\n\n/**\n * The undo engine feature.\n *\n * It introduces the `'undo'` and `'redo'` commands to the editor.\n *\n * @extends module:core/plugin~Plugin\n */\nexport default class UndoEditing extends Plugin {\n\t/**\n\t * @inheritDoc\n\t */\n\tstatic get pluginName() {\n\t\treturn 'UndoEditing';\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tconstructor( editor ) {\n\t\tsuper( editor );\n\n\t\t/**\n\t\t * The command that manages undo {@link module:engine/model/batch~Batch batches} stack (history).\n\t\t * Created and registered during the {@link #init feature initialization}.\n\t\t *\n\t\t * @private\n\t\t * @member {module:undo/undocommand~UndoCommand} #_undoCommand\n\t\t */\n\n\t\t/**\n\t\t * The command that manages redo {@link module:engine/model/batch~Batch batches} stack (history).\n\t\t * Created and registered during the {@link #init feature initialization}.\n\t\t *\n\t\t * @private\n\t\t * @member {module:undo/undocommand~UndoCommand} #_redoCommand\n\t\t */\n\n\t\t/**\n\t\t * Keeps track of which batches were registered in undo.\n\t\t *\n\t\t * @private\n\t\t * @member {WeakSet.<module:engine/model/batch~Batch>}\n\t\t */\n\t\tthis._batchRegistry = new WeakSet();\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tinit() {\n\t\tconst editor = this.editor;\n\n\t\t// Create commands.\n\t\tthis._undoCommand = new UndoCommand( editor );\n\t\tthis._redoCommand = new RedoCommand( editor );\n\n\t\t// Register command to the editor.\n\t\teditor.commands.add( 'undo', this._undoCommand );\n\t\teditor.commands.add( 'redo', this._redoCommand );\n\n\t\tthis.listenTo( editor.model, 'applyOperation', ( evt, args ) => {\n\t\t\tconst operation = args[ 0 ];\n\n\t\t\t// Do not register batch if the operation is not a document operation.\n\t\t\t// This prevents from creating empty undo steps, where all operations where non-document operations.\n\t\t\t// Non-document operations creates and alters content in detached tree fragments (for example, document fragments).\n\t\t\t// Most of time this is preparing data before it is inserted into actual tree (for example during copy & paste).\n\t\t\t// Such operations should not be reversed.\n\t\t\tif ( !operation.isDocumentOperation ) {\n\t\t\t\treturn;\n\t\t\t}\n\n\t\t\tconst batch = operation.batch;\n\n\t\t\tconst isRedoBatch = this._redoCommand._createdBatches.has( batch );\n\t\t\tconst isUndoBatch = this._undoCommand._createdBatches.has( batch );\n\t\t\tconst isRegisteredBatch = this._batchRegistry.has( batch );\n\n\t\t\t// If changes are not a part of a batch or this is not a new batch, omit those changes.\n\t\t\tif ( isRegisteredBatch || ( batch.type == 'transparent' && !isRedoBatch && !isUndoBatch ) ) {\n\t\t\t\treturn;\n\t\t\t} else {\n\t\t\t\tif ( isRedoBatch ) {\n\t\t\t\t\t// If this batch comes from `redoCommand`, add it to `undoCommand` stack.\n\t\t\t\t\tthis._undoCommand.addBatch( batch );\n\t\t\t\t} else if ( !isUndoBatch ) {\n\t\t\t\t\t// A default batch - these are new changes in the document, not introduced by undo feature.\n\t\t\t\t\t// Add them to `undoCommand` stack and clear `redoCommand` stack.\n\t\t\t\t\tthis._undoCommand.addBatch( batch );\n\t\t\t\t\tthis._redoCommand.clearStack();\n\t\t\t\t}\n\t\t\t}\n\n\t\t\t// Add the batch to the registry so it will not be processed again.\n\t\t\tthis._batchRegistry.add( batch );\n\t\t}, { priority: 'highest' } );\n\n\t\tthis.listenTo( this._undoCommand, 'revert', ( evt, undoneBatch, undoingBatch ) => {\n\t\t\tthis._redoCommand.addBatch( undoingBatch );\n\t\t} );\n\n\t\teditor.keystrokes.set( 'CTRL+Z', 'undo' );\n\t\teditor.keystrokes.set( 'CTRL+Y', 'redo' );\n\t\teditor.keystrokes.set( 'CTRL+SHIFT+Z', 'redo' );\n\t}\n}\n","export default \"<svg viewBox=\\\"0 0 20 20\\\" xmlns=\\\"http://www.w3.org/2000/svg\\\"><path d=\\\"M5.042 9.367l2.189 1.837a.75.75 0 0 1-.965 1.149l-3.788-3.18a.747.747 0 0 1-.21-.284.75.75 0 0 1 .17-.945L6.23 4.762a.75.75 0 1 1 .964 1.15L4.863 7.866h8.917A.75.75 0 0 1 14 7.9a4 4 0 1 1-1.477 7.718l.344-1.489a2.5 2.5 0 1 0 1.094-4.73l.008-.032H5.042z\\\"/></svg>\";","export default \"<svg viewBox=\\\"0 0 20 20\\\" xmlns=\\\"http://www.w3.org/2000/svg\\\"><path d=\\\"M14.958 9.367l-2.189 1.837a.75.75 0 0 0 .965 1.149l3.788-3.18a.747.747 0 0 0 .21-.284.75.75 0 0 0-.17-.945L13.77 4.762a.75.75 0 1 0-.964 1.15l2.331 1.955H6.22A.75.75 0 0 0 6 7.9a4 4 0 1 0 1.477 7.718l-.344-1.489A2.5 2.5 0 1 1 6.039 9.4l-.008-.032h8.927z\\\"/></svg>\";","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module undo/undoui\n */\n\nimport Plugin from '@ckeditor/ckeditor5-core/src/plugin';\nimport ButtonView from '@ckeditor/ckeditor5-ui/src/button/buttonview';\n\nimport undoIcon from '../theme/icons/undo.svg';\nimport redoIcon from '../theme/icons/redo.svg';\n\n/**\n * The undo UI feature. It introduces the `'undo'` and `'redo'` buttons to the editor.\n *\n * @extends module:core/plugin~Plugin\n */\nexport default class UndoUI extends Plugin {\n\t/**\n\t * @inheritDoc\n\t */\n\tinit() {\n\t\tconst editor = this.editor;\n\t\tconst locale = editor.locale;\n\t\tconst t = editor.t;\n\n\t\tconst localizedUndoIcon = locale.uiLanguageDirection == 'ltr' ? undoIcon : redoIcon;\n\t\tconst localizedRedoIcon = locale.uiLanguageDirection == 'ltr' ? redoIcon : undoIcon;\n\n\t\tthis._addButton( 'undo', t( 'Undo' ), 'CTRL+Z', localizedUndoIcon );\n\t\tthis._addButton( 'redo', t( 'Redo' ), 'CTRL+Y', localizedRedoIcon );\n\t}\n\n\t/**\n\t * Creates a button for the specified command.\n\t *\n\t * @private\n\t * @param {String} name Command name.\n\t * @param {String} label Button label.\n\t * @param {String} keystroke Command keystroke.\n\t * @param {String} Icon Source of the icon.\n\t */\n\t_addButton( name, label, keystroke, Icon ) {\n\t\tconst editor = this.editor;\n\n\t\teditor.ui.componentFactory.add( name, locale => {\n\t\t\tconst command = editor.commands.get( name );\n\t\t\tconst view = new ButtonView( locale );\n\n\t\t\tview.set( {\n\t\t\t\tlabel,\n\t\t\t\ticon: Icon,\n\t\t\t\tkeystroke,\n\t\t\t\ttooltip: true\n\t\t\t} );\n\n\t\t\tview.bind( 'isEnabled' ).to( command, 'isEnabled' );\n\n\t\t\tthis.listenTo( view, 'execute', () => {\n\t\t\t\teditor.execute( name );\n\t\t\t\teditor.editing.view.focus();\n\t\t\t} );\n\n\t\t\treturn view;\n\t\t} );\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module undo/undo\n */\n\nimport Plugin from '@ckeditor/ckeditor5-core/src/plugin';\nimport UndoEditing from './undoediting';\nimport UndoUI from './undoui';\n\n/**\n * The undo feature.\n *\n * This is a \"glue\" plugin which loads the {@link module:undo/undoediting~UndoEditing undo editing feature}\n * and {@link module:undo/undoui~UndoUI undo UI feature}.\n *\n * Below is the explanation of the undo mechanism working together with {@link module:engine/model/history~History History}:\n *\n * Whenever a {@link module:engine/model/operation/operation~Operation operation} is applied to the\n * {@link module:engine/model/document~Document document}, it is saved to `History` as is.\n * The {@link module:engine/model/batch~Batch batch} that owns that operation is also saved, in\n * {@link module:undo/undocommand~UndoCommand}, together with the selection that was present in the document before the\n * operation was applied. A batch is saved instead of the operation because changes are undone batch-by-batch, not operation-by-operation\n * and a batch is seen as one undo step.\n *\n * After some changes happen to the document, the `History` and `UndoCommand` stack can be represented as follows:\n *\n *\t\t    History                            Undo stack\n *\t\t==============             ==================================\n *\t\t[operation A1]                         [batch A]\n *\t\t[operation B1]                         [batch B]\n *\t\t[operation B2]                         [batch C]\n *\t\t[operation C1]\n *\t\t[operation C2]\n *\t\t[operation B3]\n *\t\t[operation C3]\n *\n * Where operations starting with the same letter are from same batch.\n *\n * Undoing a batch means that a set of operations which will reverse the effects of that batch needs to be generated.\n * For example, if a batch added several letters, undoing the batch should remove them. It is important to apply undoing\n * operations in the reversed order, so if a batch has operation `X`, `Y`, `Z`, reversed operations `Zr`, `Yr` and `Xr`\n * need to be applied. Otherwise reversed operation `Xr` would operate on a wrong document state, because operation `X`\n * does not know that operations `Y` and `Z` happened.\n *\n * After operations from an undone batch got {@link module:engine/model/operation/operation~Operation#getReversed reversed},\n * one needs to make sure if they are ready to be applied. In the scenario above, operation `C3` is the last operation and `C3r`\n * bases on up-to-date document state, so it can be applied to the document.\n *\n *\t\t     History                             Undo stack\n *\t\t=================             ==================================\n *\t\t[ operation A1  ]                      [  batch A  ]\n *\t\t[ operation B1  ]                      [  batch B  ]\n *\t\t[ operation B2  ]             [   processing undoing batch C   ]\n *\t\t[ operation C1  ]\n *\t\t[ operation C2  ]\n *\t\t[ operation B3  ]\n *\t\t[ operation C3  ]\n *\t\t[ operation C3r ]\n *\n * Next is operation `C2`, reversed to `C2r`. `C2r` bases on `C2`, so it bases on the wrong document state. It needs to be\n * transformed by operations from history that happened after it, so it \"knows\" about them. Let us assume that `C2' = C2r * B3 * C3 * C3r`,\n * where `*` means \"transformed by\". Rest of operations from that batch are processed in the same fashion.\n *\n *\t\t     History                             Undo stack                                      Redo stack\n *\t\t=================             ==================================             ==================================\n *\t\t[ operation A1  ]                      [  batch A  ]                                    [ batch Cr ]\n *\t\t[ operation B1  ]                      [  batch B  ]\n *\t\t[ operation B2  ]\n *\t\t[ operation C1  ]\n *\t\t[ operation C2  ]\n *\t\t[ operation B3  ]\n *\t\t[ operation C3  ]\n *\t\t[ operation C3r ]\n *\t\t[ operation C2' ]\n *\t\t[ operation C1' ]\n *\n * Selective undo works on the same basis, however, instead of undoing the last batch in the undo stack, any batch can be undone.\n * The same algorithm applies: operations from a batch (i.e. `A1`) are reversed and then transformed by operations stored in history.\n *\n * Redo also is very similar to undo. It has its own stack that is filled with undoing (reversed batches). Operations from\n * batch that is re-done are reversed-back, transformed in proper order and applied to the document.\n *\n *\t\t     History                             Undo stack                                      Redo stack\n *\t\t=================             ==================================             ==================================\n *\t\t[ operation A1  ]                      [  batch A  ]\n *\t\t[ operation B1  ]                      [  batch B  ]\n *\t\t[ operation B2  ]                      [ batch Crr ]\n *\t\t[ operation C1  ]\n *\t\t[ operation C2  ]\n *\t\t[ operation B3  ]\n *\t\t[ operation C3  ]\n *\t\t[ operation C3r ]\n *\t\t[ operation C2' ]\n *\t\t[ operation C1' ]\n *\t\t[ operation C1'r]\n *\t\t[ operation C2'r]\n *\t\t[ operation C3rr]\n *\n * @extends module:core/plugin~Plugin\n */\nexport default class Undo extends Plugin {\n\t/**\n\t * @inheritDoc\n\t */\n\tstatic get requires() {\n\t\treturn [ UndoEditing, UndoUI ];\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tstatic get pluginName() {\n\t\treturn 'Undo';\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module highlight/highlightcommand\n */\n\nimport Command from '@ckeditor/ckeditor5-core/src/command';\n\n/**\n * The highlight command. It is used by the {@link module:highlight/highlightediting~HighlightEditing highlight feature}\n * to apply the text highlighting.\n *\n *\t\teditor.execute( 'highlight', { value: 'greenMarker' } );\n *\n * **Note**: Executing the command without a value removes the attribute from the model. If the selection is collapsed\n * inside a text with the highlight attribute, the command will remove the attribute from the entire range\n * of that text.\n *\n * @extends module:core/command~Command\n */\nexport default class HighlightCommand extends Command {\n\t/**\n\t * @inheritDoc\n\t */\n\trefresh() {\n\t\tconst model = this.editor.model;\n\t\tconst doc = model.document;\n\n\t\t/**\n\t\t * A value indicating whether the command is active. If the selection has some highlight attribute,\n\t\t * it corresponds to the value of that attribute.\n\t\t *\n\t\t * @observable\n\t\t * @readonly\n\t\t * @member {undefined|String} module:highlight/highlightcommand~HighlightCommand#value\n\t\t */\n\t\tthis.value = doc.selection.getAttribute( 'highlight' );\n\t\tthis.isEnabled = model.schema.checkAttributeInSelection( doc.selection, 'highlight' );\n\t}\n\n\t/**\n\t * Executes the command.\n\t *\n\t * @param {Object} [options] Options for the executed command.\n\t * @param {String} [options.value] The value to apply.\n\t *\n\t * @fires execute\n\t */\n\texecute( options = {} ) {\n\t\tconst model = this.editor.model;\n\t\tconst document = model.document;\n\t\tconst selection = document.selection;\n\n\t\tconst highlighter = options.value;\n\n\t\tmodel.change( writer => {\n\t\t\tconst ranges = model.schema.getValidRanges( selection.getRanges(), 'highlight' );\n\n\t\t\tif ( selection.isCollapsed ) {\n\t\t\t\tconst position = selection.getFirstPosition();\n\n\t\t\t\t// When selection is inside text with `highlight` attribute.\n\t\t\t\tif ( selection.hasAttribute( 'highlight' ) ) {\n\t\t\t\t\t// Find the full highlighted range.\n\t\t\t\t\tconst isSameHighlight = value => {\n\t\t\t\t\t\treturn value.item.hasAttribute( 'highlight' ) && value.item.getAttribute( 'highlight' ) === this.value;\n\t\t\t\t\t};\n\n\t\t\t\t\tconst highlightStart = position.getLastMatchingPosition( isSameHighlight, { direction: 'backward' } );\n\t\t\t\t\tconst highlightEnd = position.getLastMatchingPosition( isSameHighlight );\n\n\t\t\t\t\tconst highlightRange = writer.createRange( highlightStart, highlightEnd );\n\n\t\t\t\t\t// Then depending on current value...\n\t\t\t\t\tif ( !highlighter || this.value === highlighter ) {\n\t\t\t\t\t\t// ...remove attribute when passing highlighter different then current or executing \"eraser\".\n\t\t\t\t\t\twriter.removeAttribute( 'highlight', highlightRange );\n\t\t\t\t\t\twriter.removeSelectionAttribute( 'highlight' );\n\t\t\t\t\t} else {\n\t\t\t\t\t\t// ...update `highlight` value.\n\t\t\t\t\t\twriter.setAttribute( 'highlight', highlighter, highlightRange );\n\t\t\t\t\t\twriter.setSelectionAttribute( 'highlight', highlighter );\n\t\t\t\t\t}\n\t\t\t\t} else if ( highlighter ) {\n\t\t\t\t\twriter.setSelectionAttribute( 'highlight', highlighter );\n\t\t\t\t}\n\t\t\t} else {\n\t\t\t\tfor ( const range of ranges ) {\n\t\t\t\t\tif ( highlighter ) {\n\t\t\t\t\t\twriter.setAttribute( 'highlight', highlighter, range );\n\t\t\t\t\t} else {\n\t\t\t\t\t\twriter.removeAttribute( 'highlight', range );\n\t\t\t\t\t}\n\t\t\t\t}\n\t\t\t}\n\t\t} );\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module highlight/highlightediting\n */\n\nimport Plugin from '@ckeditor/ckeditor5-core/src/plugin';\n\nimport HighlightCommand from './highlightcommand';\n\n/**\n * The highlight editing feature. It introduces the {@link module:highlight/highlightcommand~HighlightCommand command} and the `highlight`\n * attribute in the {@link module:engine/model/model~Model model} which renders in the {@link module:engine/view/view view}\n * as a `<mark>` element with a `class` attribute (`<mark class=\"marker-green\">...</mark>`) depending\n * on the {@link module:highlight/highlight~HighlightConfig configuration}.\n *\n * @extends module:core/plugin~Plugin\n */\nexport default class HighlightEditing extends Plugin {\n\t/**\n\t * @inheritDoc\n\t */\n\tstatic get pluginName() {\n\t\treturn 'HighlightEditing';\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tconstructor( editor ) {\n\t\tsuper( editor );\n\n\t\teditor.config.define( 'highlight', {\n\t\t\toptions: [\n\t\t\t\t{\n\t\t\t\t\tmodel: 'yellowMarker',\n\t\t\t\t\tclass: 'marker-yellow',\n\t\t\t\t\ttitle: 'Yellow marker',\n\t\t\t\t\tcolor: 'var(--ck-highlight-marker-yellow)',\n\t\t\t\t\ttype: 'marker'\n\t\t\t\t},\n\t\t\t\t{\n\t\t\t\t\tmodel: 'greenMarker',\n\t\t\t\t\tclass: 'marker-green',\n\t\t\t\t\ttitle: 'Green marker',\n\t\t\t\t\tcolor: 'var(--ck-highlight-marker-green)',\n\t\t\t\t\ttype: 'marker'\n\t\t\t\t},\n\t\t\t\t{\n\t\t\t\t\tmodel: 'pinkMarker',\n\t\t\t\t\tclass: 'marker-pink',\n\t\t\t\t\ttitle: 'Pink marker',\n\t\t\t\t\tcolor: 'var(--ck-highlight-marker-pink)',\n\t\t\t\t\ttype: 'marker'\n\t\t\t\t},\n\t\t\t\t{\n\t\t\t\t\tmodel: 'blueMarker',\n\t\t\t\t\tclass: 'marker-blue',\n\t\t\t\t\ttitle: 'Blue marker',\n\t\t\t\t\tcolor: 'var(--ck-highlight-marker-blue)',\n\t\t\t\t\ttype: 'marker'\n\t\t\t\t},\n\t\t\t\t{\n\t\t\t\t\tmodel: 'redPen',\n\t\t\t\t\tclass: 'pen-red',\n\t\t\t\t\ttitle: 'Red pen',\n\t\t\t\t\tcolor: 'var(--ck-highlight-pen-red)',\n\t\t\t\t\ttype: 'pen'\n\t\t\t\t},\n\t\t\t\t{\n\t\t\t\t\tmodel: 'greenPen',\n\t\t\t\t\tclass: 'pen-green',\n\t\t\t\t\ttitle: 'Green pen',\n\t\t\t\t\tcolor: 'var(--ck-highlight-pen-green)',\n\t\t\t\t\ttype: 'pen'\n\t\t\t\t}\n\t\t\t]\n\t\t} );\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tinit() {\n\t\tconst editor = this.editor;\n\n\t\t// Allow highlight attribute on text nodes.\n\t\teditor.model.schema.extend( '$text', { allowAttributes: 'highlight' } );\n\n\t\tconst options = editor.config.get( 'highlight.options' );\n\n\t\t// Set-up the two-way conversion.\n\t\teditor.conversion.attributeToElement( _buildDefinition( options ) );\n\n\t\teditor.commands.add( 'highlight', new HighlightCommand( editor ) );\n\t}\n}\n\n// Converts the options array to a converter definition.\n//\n// @param {Array.<module:highlight/highlight~HighlightOption>} options An array with configured options.\n// @returns {module:engine/conversion/conversion~ConverterDefinition}\nfunction _buildDefinition( options ) {\n\tconst definition = {\n\t\tmodel: {\n\t\t\tkey: 'highlight',\n\t\t\tvalues: []\n\t\t},\n\t\tview: {}\n\t};\n\n\tfor ( const option of options ) {\n\t\tdefinition.model.values.push( option.model );\n\t\tdefinition.view[ option.model ] = {\n\t\t\tname: 'mark',\n\t\t\tclasses: option.class\n\t\t};\n\t}\n\n\treturn definition;\n}\n","export default \"<svg viewBox=\\\"0 0 20 20\\\" xmlns=\\\"http://www.w3.org/2000/svg\\\"><path class=\\\"ck-icon__fill\\\" d=\\\"M10.798 1.59L3.002 12.875l1.895 1.852 2.521 1.402 6.997-12.194z\\\"/><path d=\\\"M2.556 16.727l.234-.348c-.297-.151-.462-.293-.498-.426-.036-.137.002-.416.115-.837.094-.25.15-.449.169-.595a4.495 4.495 0 0 0 0-.725c-.209-.621-.303-1.041-.284-1.26.02-.218.178-.506.475-.862l6.77-9.414c.539-.91 1.605-.85 3.199.18 1.594 1.032 2.188 1.928 1.784 2.686l-5.877 10.36c-.158.412-.333.673-.526.782-.193.108-.604.179-1.232.21-.362.131-.608.237-.738.318-.13.081-.305.238-.526.47-.293.265-.504.397-.632.397-.096 0-.27-.075-.524-.226l-.31.41-1.6-1.12zm-.279.415l1.575 1.103-.392.515H1.19l1.087-1.618zm8.1-13.656l-4.953 6.9L8.75 12.57l4.247-7.574c.175-.25-.188-.647-1.092-1.192-.903-.546-1.412-.652-1.528-.32zM8.244 18.5L9.59 17h9.406v1.5H8.245z\\\"/></svg>\";","import api from \"!../../../../../style-loader/dist/runtime/injectStylesIntoStyleTag.js\";\n            import content from \"!!../../../../../css-loader/dist/cjs.js!../../../../../postcss-loader/dist/cjs.js??ref--5-2!./splitbutton.css\";\n\nvar options = {\"injectType\":\"singletonStyleTag\",\"attributes\":{\"data-cke\":true}};\n\noptions.insert = \"head\";\noptions.singleton = true;\n\nvar update = api(content, options);\n\n\n\nexport default content.locals || {};","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module ui/dropdown/button/splitbuttonview\n */\n\nimport View from '../../view';\nimport ButtonView from '../../button/buttonview';\n\nimport KeystrokeHandler from '@ckeditor/ckeditor5-utils/src/keystrokehandler';\nimport FocusTracker from '@ckeditor/ckeditor5-utils/src/focustracker';\n\nimport dropdownArrowIcon from '../../../theme/icons/dropdown-arrow.svg';\n\nimport '../../../theme/components/dropdown/splitbutton.css';\n\n/**\n * The split button view class.\n *\n *\t\tconst view = new SplitButtonView();\n *\n *\t\tview.set( {\n *\t\t\tlabel: 'A button',\n *\t\t\tkeystroke: 'Ctrl+B',\n *\t\t\ttooltip: true\n *\t\t} );\n *\n *\t\tview.render();\n *\n *\t\tdocument.body.append( view.element );\n *\n * Also see the {@link module:ui/dropdown/utils~createDropdown `createDropdown()` util}.\n *\n * @implements module:ui/dropdown/button/dropdownbutton~DropdownButton\n * @extends module:ui/view~View\n */\nexport default class SplitButtonView extends View {\n\t/**\n\t * @inheritDoc\n\t */\n\tconstructor( locale ) {\n\t\tsuper( locale );\n\n\t\tconst bind = this.bindTemplate;\n\n\t\t// Implement the Button interface.\n\t\tthis.set( 'icon' );\n\t\tthis.set( 'isEnabled', true );\n\t\tthis.set( 'isOn', false );\n\t\tthis.set( 'isToggleable', false );\n\t\tthis.set( 'isVisible', true );\n\t\tthis.set( 'keystroke' );\n\t\tthis.set( 'label' );\n\t\tthis.set( 'tabindex', -1 );\n\t\tthis.set( 'tooltip' );\n\t\tthis.set( 'tooltipPosition', 's' );\n\t\tthis.set( 'type', 'button' );\n\t\tthis.set( 'withText', false );\n\n\t\t/**\n\t\t * Collection of the child views inside of the split button {@link #element}.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:ui/viewcollection~ViewCollection}\n\t\t */\n\t\tthis.children = this.createCollection();\n\n\t\t/**\n\t\t * A main button of split button.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:ui/button/buttonview~ButtonView}\n\t\t */\n\t\tthis.actionView = this._createActionView();\n\n\t\t/**\n\t\t * A secondary button of split button that opens dropdown.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:ui/button/buttonview~ButtonView}\n\t\t */\n\t\tthis.arrowView = this._createArrowView();\n\n\t\t/**\n\t\t * Instance of the {@link module:utils/keystrokehandler~KeystrokeHandler}. It manages\n\t\t * keystrokes of the split button:\n\t\t *\n\t\t * * <kbd>▶</kbd> moves focus to arrow view when action view is focused,\n\t\t * * <kbd>◀</kbd> moves focus to action view when arrow view is focused.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:utils/keystrokehandler~KeystrokeHandler}\n\t\t */\n\t\tthis.keystrokes = new KeystrokeHandler();\n\n\t\t/**\n\t\t * Tracks information about DOM focus in the dropdown.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:utils/focustracker~FocusTracker}\n\t\t */\n\t\tthis.focusTracker = new FocusTracker();\n\n\t\tthis.setTemplate( {\n\t\t\ttag: 'div',\n\n\t\t\tattributes: {\n\t\t\t\tclass: [\n\t\t\t\t\t'ck',\n\t\t\t\t\t'ck-splitbutton',\n\t\t\t\t\tbind.if( 'isVisible', 'ck-hidden', value => !value ),\n\t\t\t\t\tthis.arrowView.bindTemplate.if( 'isOn', 'ck-splitbutton_open' )\n\t\t\t\t]\n\t\t\t},\n\n\t\t\tchildren: this.children\n\t\t} );\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\trender() {\n\t\tsuper.render();\n\n\t\tthis.children.add( this.actionView );\n\t\tthis.children.add( this.arrowView );\n\n\t\tthis.focusTracker.add( this.actionView.element );\n\t\tthis.focusTracker.add( this.arrowView.element );\n\n\t\tthis.keystrokes.listenTo( this.element );\n\n\t\t// Overrides toolbar focus cycling behavior.\n\t\tthis.keystrokes.set( 'arrowright', ( evt, cancel ) => {\n\t\t\tif ( this.focusTracker.focusedElement === this.actionView.element ) {\n\t\t\t\tthis.arrowView.focus();\n\n\t\t\t\tcancel();\n\t\t\t}\n\t\t} );\n\n\t\t// Overrides toolbar focus cycling behavior.\n\t\tthis.keystrokes.set( 'arrowleft', ( evt, cancel ) => {\n\t\t\tif ( this.focusTracker.focusedElement === this.arrowView.element ) {\n\t\t\t\tthis.actionView.focus();\n\n\t\t\t\tcancel();\n\t\t\t}\n\t\t} );\n\t}\n\n\t/**\n\t * Focuses the {@link #actionView#element} of the action part of split button.\n\t */\n\tfocus() {\n\t\tthis.actionView.focus();\n\t}\n\n\t/**\n\t * Creates a {@link module:ui/button/buttonview~ButtonView} instance as {@link #actionView} and binds it with main split button\n\t * attributes.\n\t *\n\t * @private\n\t * @returns {module:ui/button/buttonview~ButtonView}\n\t */\n\t_createActionView() {\n\t\tconst actionView = new ButtonView();\n\n\t\tactionView.bind(\n\t\t\t'icon',\n\t\t\t'isEnabled',\n\t\t\t'isOn',\n\t\t\t'isToggleable',\n\t\t\t'keystroke',\n\t\t\t'label',\n\t\t\t'tabindex',\n\t\t\t'tooltip',\n\t\t\t'tooltipPosition',\n\t\t\t'type',\n\t\t\t'withText'\n\t\t).to( this );\n\n\t\tactionView.extendTemplate( {\n\t\t\tattributes: {\n\t\t\t\tclass: 'ck-splitbutton__action'\n\t\t\t}\n\t\t} );\n\n\t\tactionView.delegate( 'execute' ).to( this );\n\n\t\treturn actionView;\n\t}\n\n\t/**\n\t * Creates a {@link module:ui/button/buttonview~ButtonView} instance as {@link #arrowView} and binds it with main split button\n\t * attributes.\n\t *\n\t * @private\n\t * @returns {module:ui/button/buttonview~ButtonView}\n\t */\n\t_createArrowView() {\n\t\tconst arrowView = new ButtonView();\n\t\tconst bind = arrowView.bindTemplate;\n\n\t\tarrowView.icon = dropdownArrowIcon;\n\n\t\tarrowView.extendTemplate( {\n\t\t\tattributes: {\n\t\t\t\tclass: 'ck-splitbutton__arrow',\n\t\t\t\t'aria-haspopup': true,\n\t\t\t\t'aria-expanded': bind.to( 'isOn', value => String( value ) )\n\t\t\t}\n\t\t} );\n\n\t\tarrowView.bind( 'isEnabled' ).to( this );\n\n\t\tarrowView.delegate( 'execute' ).to( this, 'open' );\n\n\t\treturn arrowView;\n\t}\n}\n","import api from \"!../../../style-loader/dist/runtime/injectStylesIntoStyleTag.js\";\n            import content from \"!!../../../css-loader/dist/cjs.js!../../../postcss-loader/dist/cjs.js??ref--5-2!./highlight.css\";\n\nvar options = {\"injectType\":\"singletonStyleTag\",\"attributes\":{\"data-cke\":true}};\n\noptions.insert = \"head\";\noptions.singleton = true;\n\nvar update = api(content, options);\n\n\n\nexport default content.locals || {};","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module highlight/highlightui\n */\n\nimport Plugin from '@ckeditor/ckeditor5-core/src/plugin';\n\nimport ButtonView from '@ckeditor/ckeditor5-ui/src/button/buttonview';\n\nimport markerIcon from './../theme/icons/marker.svg';\nimport penIcon from './../theme/icons/pen.svg';\nimport eraserIcon from '@ckeditor/ckeditor5-core/theme/icons/eraser.svg';\n\nimport ToolbarSeparatorView from '@ckeditor/ckeditor5-ui/src/toolbar/toolbarseparatorview';\nimport SplitButtonView from '@ckeditor/ckeditor5-ui/src/dropdown/button/splitbuttonview';\nimport { createDropdown, addToolbarToDropdown } from '@ckeditor/ckeditor5-ui/src/dropdown/utils';\n\nimport './../theme/highlight.css';\n\n/**\n * The default highlight UI plugin. It introduces:\n *\n * * The `'highlight'` dropdown,\n * * The `'removeHighlight'` and `'highlight:*'` buttons.\n *\n * The default configuration includes the following buttons:\n *\n * * `'highlight:yellowMarker'`\n * * `'highlight:greenMarker'`\n * * `'highlight:pinkMarker'`\n * * `'highlight:blueMarker'`\n * * `'highlight:redPen'`\n * * `'highlight:greenPen'`\n *\n * See the {@link module:highlight/highlight~HighlightConfig#options configuration} to learn more\n * about the defaults.\n *\n * @extends module:core/plugin~Plugin\n */\nexport default class HighlightUI extends Plugin {\n\t/**\n\t * Returns the localized option titles provided by the plugin.\n\t *\n\t * The following localized titles corresponding with default\n\t * {@link module:highlight/highlight~HighlightConfig#options} are available:\n\t *\n\t * * `'Yellow marker'`,\n\t * * `'Green marker'`,\n\t * * `'Pink marker'`,\n\t * * `'Blue marker'`,\n\t * * `'Red pen'`,\n\t * * `'Green pen'`.\n\t *\n\t * @readonly\n\t * @type {Object.<String,String>}\n\t */\n\tget localizedOptionTitles() {\n\t\tconst t = this.editor.t;\n\n\t\treturn {\n\t\t\t'Yellow marker': t( 'Yellow marker' ),\n\t\t\t'Green marker': t( 'Green marker' ),\n\t\t\t'Pink marker': t( 'Pink marker' ),\n\t\t\t'Blue marker': t( 'Blue marker' ),\n\t\t\t'Red pen': t( 'Red pen' ),\n\t\t\t'Green pen': t( 'Green pen' )\n\t\t};\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tstatic get pluginName() {\n\t\treturn 'HighlightUI';\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tinit() {\n\t\tconst options = this.editor.config.get( 'highlight.options' );\n\n\t\tfor ( const option of options ) {\n\t\t\tthis._addHighlighterButton( option );\n\t\t}\n\n\t\tthis._addRemoveHighlightButton();\n\n\t\tthis._addDropdown( options );\n\t}\n\n\t/**\n\t * Creates the \"Remove highlight\" button.\n\t *\n\t * @private\n\t */\n\t_addRemoveHighlightButton() {\n\t\tconst t = this.editor.t;\n\n\t\tthis._addButton( 'removeHighlight', t( 'Remove highlight' ), eraserIcon );\n\t}\n\n\t/**\n\t * Creates a toolbar button from the provided highlight option.\n\t *\n\t * @param {module:highlight/highlight~HighlightOption} option\n\t * @private\n\t */\n\t_addHighlighterButton( option ) {\n\t\tconst command = this.editor.commands.get( 'highlight' );\n\n\t\t// TODO: change naming\n\t\tthis._addButton( 'highlight:' + option.model, option.title, getIconForType( option.type ), option.model, decorateHighlightButton );\n\n\t\tfunction decorateHighlightButton( button ) {\n\t\t\tbutton.bind( 'isEnabled' ).to( command, 'isEnabled' );\n\t\t\tbutton.bind( 'isOn' ).to( command, 'value', value => value === option.model );\n\t\t\tbutton.iconView.fillColor = option.color;\n\t\t\tbutton.isToggleable = true;\n\t\t}\n\t}\n\n\t/**\n\t * Internal method for creating highlight buttons.\n\t *\n\t * @param {String} name The name of the button.\n\t * @param {String} label The label for the button.\n\t * @param {String} icon The button icon.\n\t * @param {Function} [decorateButton=()=>{}] Additional method for extending the button.\n\t * @private\n\t */\n\t_addButton( name, label, icon, value, decorateButton = () => {} ) {\n\t\tconst editor = this.editor;\n\n\t\teditor.ui.componentFactory.add( name, locale => {\n\t\t\tconst buttonView = new ButtonView( locale );\n\n\t\t\tconst localized = this.localizedOptionTitles[ label ] ? this.localizedOptionTitles[ label ] : label;\n\n\t\t\tbuttonView.set( {\n\t\t\t\tlabel: localized,\n\t\t\t\ticon,\n\t\t\t\ttooltip: true\n\t\t\t} );\n\n\t\t\tbuttonView.on( 'execute', () => {\n\t\t\t\teditor.execute( 'highlight', { value } );\n\t\t\t\teditor.editing.view.focus();\n\t\t\t} );\n\n\t\t\t// Add additional behavior for buttonView.\n\t\t\tdecorateButton( buttonView );\n\n\t\t\treturn buttonView;\n\t\t} );\n\t}\n\n\t/**\n\t * Creates the split button dropdown UI from the provided highlight options.\n\t *\n\t * @param {Array.<module:highlight/highlight~HighlightOption>} options\n\t * @private\n\t */\n\t_addDropdown( options ) {\n\t\tconst editor = this.editor;\n\t\tconst t = editor.t;\n\t\tconst componentFactory = editor.ui.componentFactory;\n\n\t\tconst startingHighlighter = options[ 0 ];\n\n\t\tconst optionsMap = options.reduce( ( retVal, option ) => {\n\t\t\tretVal[ option.model ] = option;\n\n\t\t\treturn retVal;\n\t\t}, {} );\n\n\t\tcomponentFactory.add( 'highlight', locale => {\n\t\t\tconst command = editor.commands.get( 'highlight' );\n\t\t\tconst dropdownView = createDropdown( locale, SplitButtonView );\n\t\t\tconst splitButtonView = dropdownView.buttonView;\n\n\t\t\tsplitButtonView.set( {\n\t\t\t\ttooltip: t( 'Highlight' ),\n\t\t\t\t// Holds last executed highlighter.\n\t\t\t\tlastExecuted: startingHighlighter.model,\n\t\t\t\t// Holds current highlighter to execute (might be different then last used).\n\t\t\t\tcommandValue: startingHighlighter.model,\n\t\t\t\tisToggleable: true\n\t\t\t} );\n\n\t\t\t// Dropdown button changes to selection (command.value):\n\t\t\t// - If selection is in highlight it get active highlight appearance (icon, color) and is activated.\n\t\t\t// - Otherwise it gets appearance (icon, color) of last executed highlight.\n\t\t\tsplitButtonView.bind( 'icon' ).to( command, 'value', value => getIconForType( getActiveOption( value, 'type' ) ) );\n\t\t\tsplitButtonView.bind( 'color' ).to( command, 'value', value => getActiveOption( value, 'color' ) );\n\t\t\tsplitButtonView.bind( 'commandValue' ).to( command, 'value', value => getActiveOption( value, 'model' ) );\n\t\t\tsplitButtonView.bind( 'isOn' ).to( command, 'value', value => !!value );\n\n\t\t\tsplitButtonView.delegate( 'execute' ).to( dropdownView );\n\n\t\t\t// Create buttons array.\n\t\t\tconst buttons = options.map( option => {\n\t\t\t\t// Get existing highlighter button.\n\t\t\t\tconst buttonView = componentFactory.create( 'highlight:' + option.model );\n\n\t\t\t\t// Update lastExecutedHighlight on execute.\n\t\t\t\tthis.listenTo( buttonView, 'execute', () => dropdownView.buttonView.set( { lastExecuted: option.model } ) );\n\n\t\t\t\treturn buttonView;\n\t\t\t} );\n\n\t\t\t// Make toolbar button enabled when any button in dropdown is enabled before adding separator and eraser.\n\t\t\tdropdownView.bind( 'isEnabled' ).toMany( buttons, 'isEnabled', ( ...areEnabled ) => areEnabled.some( isEnabled => isEnabled ) );\n\n\t\t\t// Add separator and eraser buttons to dropdown.\n\t\t\tbuttons.push( new ToolbarSeparatorView() );\n\t\t\tbuttons.push( componentFactory.create( 'removeHighlight' ) );\n\n\t\t\taddToolbarToDropdown( dropdownView, buttons );\n\t\t\tbindToolbarIconStyleToActiveColor( dropdownView );\n\n\t\t\tdropdownView.toolbarView.ariaLabel = t( 'Text highlight toolbar' );\n\n\t\t\t// Execute current action from dropdown's split button action button.\n\t\t\tsplitButtonView.on( 'execute', () => {\n\t\t\t\teditor.execute( 'highlight', { value: splitButtonView.commandValue } );\n\t\t\t\teditor.editing.view.focus();\n\t\t\t} );\n\n\t\t\t// Returns active highlighter option depending on current command value.\n\t\t\t// If current is not set or it is the same as last execute this method will return the option key (like icon or color)\n\t\t\t// of last executed highlighter. Otherwise it will return option key for current one.\n\t\t\tfunction getActiveOption( current, key ) {\n\t\t\t\tconst whichHighlighter = !current ||\n\t\t\t\tcurrent === splitButtonView.lastExecuted ? splitButtonView.lastExecuted : current;\n\n\t\t\t\treturn optionsMap[ whichHighlighter ][ key ];\n\t\t\t}\n\n\t\t\treturn dropdownView;\n\t\t} );\n\t}\n}\n\n// Extends split button icon style to reflect last used button style.\nfunction bindToolbarIconStyleToActiveColor( dropdownView ) {\n\tconst actionView = dropdownView.buttonView.actionView;\n\n\tactionView.iconView.bind( 'fillColor' ).to( dropdownView.buttonView, 'color' );\n}\n\n// Returns icon for given highlighter type.\nfunction getIconForType( type ) {\n\treturn type === 'marker' ? markerIcon : penIcon;\n}\n","export default \"<svg viewBox=\\\"0 0 20 20\\\" xmlns=\\\"http://www.w3.org/2000/svg\\\"><path d=\\\"M8.636 9.531l-2.758 3.94a.5.5 0 0 0 .122.696l3.224 2.284h1.314l2.636-3.736L8.636 9.53zm.288 8.451L5.14 15.396a2 2 0 0 1-.491-2.786l6.673-9.53a2 2 0 0 1 2.785-.49l3.742 2.62a2 2 0 0 1 .491 2.785l-7.269 10.053-2.147-.066z\\\"/><path d=\\\"M4 18h5.523v-1H4zm-2 0h1v-1H2z\\\"/></svg>\";","export default \"<svg viewBox=\\\"0 0 20 20\\\" xmlns=\\\"http://www.w3.org/2000/svg\\\"><path class=\\\"ck-icon__fill\\\" d=\\\"M10.126 2.268L2.002 13.874l1.895 1.852 2.521 1.402L14.47 5.481l-1.543-2.568-2.801-.645z\\\"/><path d=\\\"M4.5 18.088l-2.645-1.852-.04-2.95-.006-.005.006-.008v-.025l.011.008L8.73 2.97c.165-.233.356-.417.567-.557l-1.212.308L4.604 7.9l-.83-.558 3.694-5.495 2.708-.69 1.65 1.145.046.018.85-1.216 2.16 1.512-.856 1.222c.828.967 1.144 2.141.432 3.158L7.55 17.286l.006.005-3.055.797H4.5zm-.634.166l-1.976.516-.026-1.918 2.002 1.402zM9.968 3.817l-.006-.004-6.123 9.184 3.277 2.294 6.108-9.162.005.003c.317-.452-.16-1.332-1.064-1.966-.891-.624-1.865-.776-2.197-.349zM8.245 18.5L9.59 17h9.406v1.5H8.245z\\\"/></svg>\";","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module paragraph/paragraphcommand\n */\n\nimport Command from '@ckeditor/ckeditor5-core/src/command';\nimport first from '@ckeditor/ckeditor5-utils/src/first';\n\n/**\n * The paragraph command.\n *\n * @extends module:core/command~Command\n */\nexport default class ParagraphCommand extends Command {\n\t/**\n\t * The value of the command. Indicates whether the selection start is placed in a paragraph.\n\t *\n\t * @readonly\n\t * @observable\n\t * @member {Boolean} #value\n\t */\n\n\t/**\n\t * @inheritDoc\n\t */\n\trefresh() {\n\t\tconst model = this.editor.model;\n\t\tconst document = model.document;\n\t\tconst block = first( document.selection.getSelectedBlocks() );\n\n\t\tthis.value = !!block && block.is( 'element', 'paragraph' );\n\t\tthis.isEnabled = !!block && checkCanBecomeParagraph( block, model.schema );\n\t}\n\n\t/**\n\t * Executes the command. All the blocks (see {@link module:engine/model/schema~Schema}) in the selection\n\t * will be turned to paragraphs.\n\t *\n\t * @fires execute\n\t * @param {Object} [options] Options for the executed command.\n\t * @param {module:engine/model/selection~Selection|module:engine/model/documentselection~DocumentSelection} [options.selection]\n\t * The selection that the command should be applied to.\n\t * By default, if not provided, the command is applied to the {@link module:engine/model/document~Document#selection}.\n\t */\n\texecute( options = {} ) {\n\t\tconst model = this.editor.model;\n\t\tconst document = model.document;\n\n\t\tmodel.change( writer => {\n\t\t\tconst blocks = ( options.selection || document.selection ).getSelectedBlocks();\n\n\t\t\tfor ( const block of blocks ) {\n\t\t\t\tif ( !block.is( 'element', 'paragraph' ) && checkCanBecomeParagraph( block, model.schema ) ) {\n\t\t\t\t\twriter.rename( block, 'paragraph' );\n\t\t\t\t}\n\t\t\t}\n\t\t} );\n\t}\n}\n\n// Checks whether the given block can be replaced by a paragraph.\n//\n// @private\n// @param {module:engine/model/element~Element} block A block to be tested.\n// @param {module:engine/model/schema~Schema} schema The schema of the document.\n// @returns {Boolean}\nfunction checkCanBecomeParagraph( block, schema ) {\n\treturn schema.checkChild( block.parent, 'paragraph' ) && !schema.isObject( block );\n}\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module utils/first\n */\n\n/**\n * Returns first item of the given `iterable`.\n *\n * @param {Iterable.<*>} iterable\n * @returns {*}\n */\nexport default function first( iterable ) {\n\tconst iteratorItem = iterable.next();\n\n\tif ( iteratorItem.done ) {\n\t\treturn null;\n\t}\n\n\treturn iteratorItem.value;\n}\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module paragraph/insertparagraphcommand\n */\n\nimport Command from '@ckeditor/ckeditor5-core/src/command';\n\n/**\n * The insert paragraph command. It inserts a new paragraph at a specific\n * {@link module:engine/model/position~Position document position}.\n *\n *\t\t// Insert a new paragraph before an element in the document.\n *\t\teditor.execute( 'insertParagraph', {\n *\t\t\tposition: editor.model.createPositionBefore( element )\n *\t\t} );\n *\n * If a paragraph is disallowed in the context of the specific position, the command\n * will attempt to split position ancestors to find a place where it is possible\n * to insert a paragraph.\n *\n * **Note**: This command moves the selection to the inserted paragraph.\n *\n * @extends module:core/command~Command\n */\nexport default class InsertParagraphCommand extends Command {\n\t/**\n\t * Executes the command.\n\t *\n\t * @param {Object} options Options for the executed command.\n\t * @param {module:engine/model/position~Position} options.position The model position at which\n\t * the new paragraph will be inserted.\n\t * @fires execute\n\t */\n\texecute( options ) {\n\t\tconst model = this.editor.model;\n\t\tlet position = options.position;\n\n\t\tmodel.change( writer => {\n\t\t\tconst paragraph = writer.createElement( 'paragraph' );\n\n\t\t\tif ( !model.schema.checkChild( position.parent, paragraph ) ) {\n\t\t\t\tconst allowedParent = model.schema.findAllowedParent( position, paragraph );\n\n\t\t\t\t// It could be there's no ancestor limit that would allow paragraph.\n\t\t\t\t// In theory, \"paragraph\" could be disallowed even in the \"$root\".\n\t\t\t\tif ( !allowedParent ) {\n\t\t\t\t\treturn;\n\t\t\t\t}\n\n\t\t\t\tposition = writer.split( position, allowedParent ).position;\n\t\t\t}\n\n\t\t\tmodel.insertContent( paragraph, position );\n\n\t\t\twriter.setSelection( paragraph, 'in' );\n\t\t} );\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module paragraph/paragraph\n */\n\nimport ParagraphCommand from './paragraphcommand';\nimport InsertParagraphCommand from './insertparagraphcommand';\n\nimport Plugin from '@ckeditor/ckeditor5-core/src/plugin';\n\n/**\n * The paragraph feature for the editor.\n *\n * It introduces the `<paragraph>` element in the model which renders as a `<p>` element in the DOM and data.\n *\n * It also brings two editors commands:\n *\n * * The {@link module:paragraph/paragraphcommand~ParagraphCommand `'paragraph'`} command that converts all\n * blocks in the model selection into paragraphs.\n * * The {@link module:paragraph/insertparagraphcommand~InsertParagraphCommand `'insertParagraph'`} command\n * that inserts a new paragraph at a specified location in the model.\n *\n * @extends module:core/plugin~Plugin\n */\nexport default class Paragraph extends Plugin {\n\t/**\n\t * @inheritDoc\n\t */\n\tstatic get pluginName() {\n\t\treturn 'Paragraph';\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tinit() {\n\t\tconst editor = this.editor;\n\t\tconst model = editor.model;\n\n\t\teditor.commands.add( 'paragraph', new ParagraphCommand( editor ) );\n\t\teditor.commands.add( 'insertParagraph', new InsertParagraphCommand( editor ) );\n\n\t\t// Schema.\n\t\tmodel.schema.register( 'paragraph', { inheritAllFrom: '$block' } );\n\n\t\teditor.conversion.elementToElement( { model: 'paragraph', view: 'p' } );\n\n\t\t// Conversion for paragraph-like elements which has not been converted by any plugin.\n\t\teditor.conversion.for( 'upcast' ).elementToElement( {\n\t\t\tmodel: ( viewElement, { writer } ) => {\n\t\t\t\tif ( !Paragraph.paragraphLikeElements.has( viewElement.name ) ) {\n\t\t\t\t\treturn null;\n\t\t\t\t}\n\n\t\t\t\t// Do not auto-paragraph empty elements.\n\t\t\t\tif ( viewElement.isEmpty ) {\n\t\t\t\t\treturn null;\n\t\t\t\t}\n\n\t\t\t\treturn writer.createElement( 'paragraph' );\n\t\t\t},\n\t\t\tview: /.+/,\n\t\t\tconverterPriority: 'low'\n\t\t} );\n\t}\n}\n\n/**\n * A list of element names which should be treated by the autoparagraphing algorithms as\n * paragraph-like. This means that e.g. the following content:\n *\n *\t\t<h1>Foo</h1>\n *\t\t<table>\n *\t\t\t<tr>\n *\t\t\t\t<td>X</td>\n *\t\t\t\t<td>\n *\t\t\t\t\t<ul>\n *\t\t\t\t\t\t<li>Y</li>\n *\t\t\t\t\t\t<li>Z</li>\n *\t\t\t\t\t</ul>\n *\t\t\t\t</td>\n *\t\t\t</tr>\n *\t\t</table>\n *\n * contains five paragraph-like elements: `<h1>`, two `<td>`s and two `<li>`s.\n * Hence, if none of the features is going to convert those elements the above content will be automatically handled\n * by the paragraph feature and converted to:\n *\n *\t\t<p>Foo</p>\n *\t\t<p>X</p>\n *\t\t<p>Y</p>\n *\t\t<p>Z</p>\n *\n * Note: The `<td>` containing two `<li>` elements was ignored as the innermost paragraph-like elements\n * have a priority upon conversion.\n *\n * @member {Set.<String>} module:paragraph/paragraph~Paragraph.paragraphLikeElements\n */\nParagraph.paragraphLikeElements = new Set( [\n\t'blockquote',\n\t'dd',\n\t'div',\n\t'dt',\n\t'h1',\n\t'h2',\n\t'h3',\n\t'h4',\n\t'h5',\n\t'h6',\n\t'li',\n\t'p',\n\t'td',\n\t'th'\n] );\n","/**\n * @license Copyright (c) 2014-2021, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\nimport ClassicEditor from '@ckeditor/ckeditor5-editor-classic/src/classiceditor.js';\nimport Essentials from '@ckeditor/ckeditor5-essentials/src/essentials.js';\nimport Highlight from '@ckeditor/ckeditor5-highlight/src/highlight.js';\nimport Paragraph from '@ckeditor/ckeditor5-paragraph/src/paragraph.js';\n\nclass Editor extends ClassicEditor {}\n\n// Plugins to include in the build.\nEditor.builtinPlugins = [\n\tEssentials,\n\tHighlight,\n\tParagraph\n];\n\nexport default Editor;\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module essentials/essentials\n */\n\nimport Plugin from '@ckeditor/ckeditor5-core/src/plugin';\n\nimport Clipboard from '@ckeditor/ckeditor5-clipboard/src/clipboard';\nimport Enter from '@ckeditor/ckeditor5-enter/src/enter';\nimport ShiftEnter from '@ckeditor/ckeditor5-enter/src/shiftenter';\nimport SelectAll from '@ckeditor/ckeditor5-select-all/src/selectall';\nimport Typing from '@ckeditor/ckeditor5-typing/src/typing';\nimport Undo from '@ckeditor/ckeditor5-undo/src/undo';\n\n/**\n * A plugin including all essential editing features. It represents a set of features that enables similar functionalities\n * to a `<textarea>` element.\n *\n * It includes:\n *\n * * {@link module:clipboard/clipboard~Clipboard},\n * * {@link module:enter/enter~Enter},\n * * {@link module:select-all/selectall~SelectAll},\n * * {@link module:enter/shiftenter~ShiftEnter},\n * * {@link module:typing/typing~Typing},\n * * {@link module:undo/undo~Undo}.\n *\n * This plugin set does not define any block-level containers (such as {@link module:paragraph/paragraph~Paragraph}).\n * If your editor is supposed to handle block content, make sure to include it.\n *\n * @extends module:core/plugin~Plugin\n */\nexport default class Essentials extends Plugin {\n\t/**\n\t * @inheritDoc\n\t */\n\tstatic get requires() {\n\t\treturn [ Clipboard, Enter, SelectAll, ShiftEnter, Typing, Undo ];\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tstatic get pluginName() {\n\t\treturn 'Essentials';\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module highlight/highlight\n */\n\nimport Plugin from '@ckeditor/ckeditor5-core/src/plugin';\n\nimport HighlightEditing from './highlightediting';\nimport HighlightUI from './highlightui';\n\n/**\n * The highlight plugin.\n *\n * For a detailed overview, check the {@glink features/highlight Highlight feature} documentation.\n *\n * This is a \"glue\" plugin which loads the {@link module:highlight/highlightediting~HighlightEditing} and\n * {@link module:highlight/highlightui~HighlightUI} plugins.\n *\n * @extends module:core/plugin~Plugin\n */\nexport default class Highlight extends Plugin {\n\t/**\n\t * @inheritDoc\n\t */\n\tstatic get requires() {\n\t\treturn [ HighlightEditing, HighlightUI ];\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tstatic get pluginName() {\n\t\treturn 'Highlight';\n\t}\n}\n\n/**\n * The highlight option descriptor. See {@link module:highlight/highlight~HighlightConfig} to learn more.\n *\n *\t\t{\n *\t\t\tmodel: 'pinkMarker',\n *\t\t\tclass: 'marker-pink',\n *\t\t\ttitle: 'Pink Marker',\n *\t\t\tcolor: 'var(--ck-highlight-marker-pink)',\n *\t\t\ttype: 'marker'\n *\t\t}\n *\n * @typedef {Object} module:highlight/highlight~HighlightOption\n * @property {String} title The user-readable title of the option.\n * @property {String} model The unique attribute value in the model.\n * @property {String} color The CSS `var()` used for the highlighter. The color is used in the user interface to represent the highlighter.\n * There is a possibility to use the default color format like rgb, hex or hsl, but you need to care about the color of `<mark>`\n * by adding CSS classes definition.\n * @property {String} class The CSS class used on the `<mark>` element in the view. It should match the `color` setting.\n * @property {'marker'|'pen'} type The type of highlighter:\n *\n * * `'marker'` &ndash; Uses the `color` as the `background-color` style,\n * * `'pen'` &ndash; Uses the `color` as the font `color` style.\n */\n\n/**\n * The configuration of the {@link module:highlight/highlight~Highlight} feature.\n *\n * Read more in {@link module:highlight/highlight~HighlightConfig}.\n *\n * @member {module:highlight/highlight~HighlightConfig} module:core/editor/editorconfig~EditorConfig#highlight\n */\n\n/**\n * The configuration of the {@link module:highlight/highlight~Highlight highlight feature}.\n *\n *\t\tClassicEditor\n *\t\t\t.create( editorElement, {\n * \t\t\t\thighlight:  ... // Highlight feature configuration.\n *\t\t\t} )\n *\t\t\t.then( ... )\n *\t\t\t.catch( ... );\n *\n * See {@link module:core/editor/editorconfig~EditorConfig all editor options}.\n *\n * @interface HighlightConfig\n */\n\n/**\n * The available highlight options. The default value is:\n *\n *\t\toptions: [\n *\t\t\t{\n *\t\t\t\tmodel: 'yellowMarker',\n *\t\t\t\tclass: 'marker-yellow',\n *\t\t\t\ttitle: 'Yellow marker',\n *\t\t\t\tcolor: 'var(--ck-highlight-marker-yellow)',\n *\t\t\t\ttype: 'marker'\n *\t\t\t},\n *\t\t\t{\n *\t\t\t\tmodel: 'greenMarker',\n *\t\t\t\tclass: 'marker-green',\n *\t\t\t\ttitle: 'Green marker',\n *\t\t\t\tcolor: 'var(--ck-highlight-marker-green)',\n *\t\t\t\ttype: 'marker'\n *\t\t\t},\n *\t\t\t{\n *\t\t\t\tmodel: 'pinkMarker',\n *\t\t\t\tclass: 'marker-pink',\n *\t\t\t\ttitle: 'Pink marker',\n *\t\t\t\tcolor: 'var(--ck-highlight-marker-pink)',\n *\t\t\t\ttype: 'marker'\n *\t\t\t},\n *\t\t\t{\n *\t\t\t\tmodel: 'blueMarker',\n *\t\t\t\tclass: 'marker-blue',\n *\t\t\t\ttitle: 'Blue marker',\n *\t\t\t\tcolor: 'var(--ck-highlight-marker-blue)',\n *\t\t\t\ttype: 'marker'\n *\t\t\t},\n *\t\t\t{\n *\t\t\t\tmodel: 'redPen',\n *\t\t\t\tclass: 'pen-red',\n *\t\t\t\ttitle: 'Red pen',\n *\t\t\t\tcolor: 'var(--ck-highlight-pen-red)',\n *\t\t\t\ttype: 'pen'\n *\t\t\t},\n *\t\t\t{\n *\t\t\t\tmodel: 'greenPen',\n *\t\t\t\tclass: 'pen-green',\n *\t\t\t\ttitle: 'Green pen',\n *\t\t\t\tcolor: 'var(--ck-highlight-pen-green)',\n *\t\t\t\ttype: 'pen'\n *\t\t\t}\n *\t\t]\n *\n * There are two types of highlighters available:\n *\n * * `'marker'` &ndash; Rendered as a `<mark>` element, styled with the `background-color`.\n * * `'pen'` &ndash; Rendered as a `<mark>` element, styled with the font `color`.\n *\n * **Note**: The highlight feature provides a stylesheet with the CSS classes and corresponding colors defined\n * as CSS variables.\n *\n *\t\t:root {\n *\t\t\t--ck-highlight-marker-yellow: #fdfd77;\n *\t\t\t--ck-highlight-marker-green: #63f963;\n *\t\t\t--ck-highlight-marker-pink: #fc7999;\n *\t\t\t--ck-highlight-marker-blue: #72cdfd;\n *\t\t\t--ck-highlight-pen-red: #e91313;\n *\t\t\t--ck-highlight-pen-green: #118800;\n *\t\t}\n *\n *\t\t.marker-yellow { ... }\n *\t\t.marker-green { ... }\n *\t\t.marker-pink { ... }\n *\t\t.marker-blue { ... }\n *\t\t.pen-red { ... }\n *\t\t.pen-green { ... }\n *\n * It is possible to define the `color` property directly as `rgba(R, G, B, A)`,\n * `#RRGGBB[AA]` or `hsla(H, S, L, A)`. In such situation, the color will **only** apply to the UI of\n * the editor and the `<mark>` elements in the content must be styled by custom classes provided by\n * a dedicated stylesheet.\n *\n * **Note**: It is recommended for the `color` property to correspond to the class in the content\n * stylesheet because it represents the highlighter in the user interface of the editor.\n *\n *\t\tClassicEditor\n *\t\t\t.create( editorElement, {\n *\t\t\t\thighlight: {\n *\t\t\t\t\toptions: [\n *\t\t\t\t\t\t{\n *\t\t\t\t\t\t\tmodel: 'pinkMarker',\n *\t\t\t\t\t\t\tclass: 'marker-pink',\n *\t\t\t\t\t\t\ttitle: 'Pink Marker',\n *\t\t\t\t\t\t\tcolor: 'var(--ck-highlight-marker-pink)',\n *\t\t\t\t\t\t\ttype: 'marker'\n *\t\t\t\t\t\t},\n *\t\t\t\t\t\t{\n *\t\t\t\t\t\t\tmodel: 'redPen',\n *\t\t\t\t\t\t\tclass: 'pen-red',\n *\t\t\t\t\t\t\ttitle: 'Red Pen',\n *\t\t\t\t\t\t\tcolor: 'var(--ck-highlight-pen-red)',\n *\t\t\t\t\t\t\ttype: 'pen'\n *\t\t\t\t\t\t},\n *\t\t\t\t\t]\n *\t\t\t\t}\n *\t\t} )\n *\t\t.then( ... )\n *\t\t.catch( ... );\n *\n * @member {Array.<module:highlight/highlight~HighlightOption>} module:highlight/highlight~HighlightConfig#options\n */\n"],"sourceRoot":""}