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* @license Copyright (c) 2003-2021, 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) 2003-2021, 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) 2003-2021, 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) 2003-2021, 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) 2003-2021, 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","module.exports = \"<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) 2003-2021, 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","/**\n * @license Copyright (c) 2003-2021, 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) 2003-2021, 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) 2003-2021, 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) 2003-2021, 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) 2003-2021, 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) 2003-2021, 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) 2003-2021, 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","/**\n * @license Copyright (c) 2003-2021, 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) 2003-2021, 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) 2003-2021, 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) 2003-2021, 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) 2003-2021, 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) 2003-2021, 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) 2003-2021, 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) 2003-2021, 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 upload/filereader\n */\n\n/* globals window */\n\nimport ObservableMixin from '@ckeditor/ckeditor5-utils/src/observablemixin';\nimport mix from '@ckeditor/ckeditor5-utils/src/mix';\n\n/**\n * Wrapper over the native `FileReader`.\n */\nexport default class FileReader {\n\t/**\n\t * Creates an instance of the FileReader.\n\t */\n\tconstructor() {\n\t\tconst reader = new window.FileReader();\n\n\t\t/**\n\t\t * Instance of native FileReader.\n\t\t *\n\t\t * @private\n\t\t * @member {FileReader} #_reader\n\t\t */\n\t\tthis._reader = reader;\n\n\t\tthis._data = undefined;\n\n\t\t/**\n\t\t * Number of bytes loaded.\n\t\t *\n\t\t * @readonly\n\t\t * @observable\n\t\t * @member {Number} #loaded\n\t\t */\n\t\tthis.set( 'loaded', 0 );\n\n\t\treader.onprogress = evt => {\n\t\t\tthis.loaded = evt.loaded;\n\t\t};\n\t}\n\n\t/**\n\t * Returns error that occurred during file reading.\n\t *\n\t * @returns {Error}\n\t */\n\tget error() {\n\t\treturn this._reader.error;\n\t}\n\n\t/**\n\t * Holds the data of an already loaded file. The file must be first loaded\n\t * by using {@link module:upload/filereader~FileReader#read `read()`}.\n\t *\n\t * @type {File|undefined}\n\t */\n\tget data() {\n\t\treturn this._data;\n\t}\n\n\t/**\n\t * Reads the provided file.\n\t *\n\t * @param {File} file Native File object.\n\t * @returns {Promise.<String>} Returns a promise that will be resolved with file's content.\n\t * The promise will be rejected in case of an error or when the reading process is aborted.\n\t */\n\tread( file ) {\n\t\tconst reader = this._reader;\n\t\tthis.total = file.size;\n\n\t\treturn new Promise( ( resolve, reject ) => {\n\t\t\treader.onload = () => {\n\t\t\t\tconst result = reader.result;\n\n\t\t\t\tthis._data = result;\n\n\t\t\t\tresolve( result );\n\t\t\t};\n\n\t\t\treader.onerror = () => {\n\t\t\t\treject( 'error' );\n\t\t\t};\n\n\t\t\treader.onabort = () => {\n\t\t\t\treject( 'aborted' );\n\t\t\t};\n\n\t\t\tthis._reader.readAsDataURL( file );\n\t\t} );\n\t}\n\n\t/**\n\t * Aborts file reader.\n\t */\n\tabort() {\n\t\tthis._reader.abort();\n\t}\n}\n\nmix( FileReader, ObservableMixin );\n","/**\n * @license Copyright (c) 2003-2021, 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 upload/filerepository\n */\n\nimport Plugin from '@ckeditor/ckeditor5-core/src/plugin';\n\nimport PendingActions from '@ckeditor/ckeditor5-core/src/pendingactions';\nimport CKEditorError, { logWarning } from '@ckeditor/ckeditor5-utils/src/ckeditorerror';\nimport ObservableMixin from '@ckeditor/ckeditor5-utils/src/observablemixin';\nimport Collection from '@ckeditor/ckeditor5-utils/src/collection';\nimport mix from '@ckeditor/ckeditor5-utils/src/mix';\n\nimport FileReader from './filereader.js';\n\nimport uid from '@ckeditor/ckeditor5-utils/src/uid.js';\n\n/**\n * File repository plugin. A central point for managing file upload.\n *\n * To use it, first you need an upload adapter. Upload adapter's job is to handle communication with the server\n * (sending the file and handling server's response). You can use one of the existing plugins introducing upload adapters\n * (e.g. {@link module:easy-image/cloudservicesuploadadapter~CloudServicesUploadAdapter} or\n * {@link module:adapter-ckfinder/uploadadapter~CKFinderUploadAdapter}) or write your own one – see\n * the {@glink framework/guides/deep-dive/upload-adapter \"Custom image upload adapter\" deep dive guide}.\n *\n * Then, you can use {@link module:upload/filerepository~FileRepository#createLoader `createLoader()`} and the returned\n * {@link module:upload/filerepository~FileLoader} instance to load and upload files.\n *\n * @extends module:core/plugin~Plugin\n */\nexport default class FileRepository extends Plugin {\n\t/**\n\t * @inheritDoc\n\t */\n\tstatic get pluginName() {\n\t\treturn 'FileRepository';\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tstatic get requires() {\n\t\treturn [ PendingActions ];\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tinit() {\n\t\t/**\n\t\t * Collection of loaders associated with this repository.\n\t\t *\n\t\t * @member {module:utils/collection~Collection} #loaders\n\t\t */\n\t\tthis.loaders = new Collection();\n\n\t\t// Keeps upload in a sync with pending actions.\n\t\tthis.loaders.on( 'add', () => this._updatePendingAction() );\n\t\tthis.loaders.on( 'remove', () => this._updatePendingAction() );\n\n\t\t/**\n\t\t * Loaders mappings used to retrieve loaders references.\n\t\t *\n\t\t * @private\n\t\t * @member {Map<File|Promise, FileLoader>} #_loadersMap\n\t\t */\n\t\tthis._loadersMap = new Map();\n\n\t\t/**\n\t\t * Reference to a pending action registered in a {@link module:core/pendingactions~PendingActions} plugin\n\t\t * while upload is in progress. When there is no upload then value is `null`.\n\t\t *\n\t\t * @private\n\t\t * @member {Object} #_pendingAction\n\t\t */\n\t\tthis._pendingAction = null;\n\n\t\t/**\n\t\t * A factory function which should be defined before using `FileRepository`.\n\t\t *\n\t\t * It should return a new instance of {@link module:upload/filerepository~UploadAdapter} that will be used to upload files.\n\t\t * {@link module:upload/filerepository~FileLoader} instance associated with the adapter\n\t\t * will be passed to that function.\n\t\t *\n\t\t * For more information and example see {@link module:upload/filerepository~UploadAdapter}.\n\t\t *\n\t\t * @member {Function} #createUploadAdapter\n\t\t */\n\n\t\t/**\n\t\t * Number of bytes uploaded.\n\t\t *\n\t\t * @readonly\n\t\t * @observable\n\t\t * @member {Number} #uploaded\n\t\t */\n\t\tthis.set( 'uploaded', 0 );\n\n\t\t/**\n\t\t * Number of total bytes to upload.\n\t\t *\n\t\t * It might be different than the file size because of headers and additional data.\n\t\t * It contains `null` if value is not available yet, so it's better to use {@link #uploadedPercent} to monitor\n\t\t * the progress.\n\t\t *\n\t\t * @readonly\n\t\t * @observable\n\t\t * @member {Number|null} #uploadTotal\n\t\t */\n\t\tthis.set( 'uploadTotal', null );\n\n\t\t/**\n\t\t * Upload progress in percents.\n\t\t *\n\t\t * @readonly\n\t\t * @observable\n\t\t * @member {Number} #uploadedPercent\n\t\t */\n\t\tthis.bind( 'uploadedPercent' ).to( this, 'uploaded', this, 'uploadTotal', ( uploaded, total ) => {\n\t\t\treturn total ? ( uploaded / total * 100 ) : 0;\n\t\t} );\n\t}\n\n\t/**\n\t * Returns the loader associated with specified file or promise.\n\t *\n\t * To get loader by id use `fileRepository.loaders.get( id )`.\n\t *\n\t * @param {File|Promise.<File>} fileOrPromise Native file or promise handle.\n\t * @returns {module:upload/filerepository~FileLoader|null}\n\t */\n\tgetLoader( fileOrPromise ) {\n\t\treturn this._loadersMap.get( fileOrPromise ) || null;\n\t}\n\n\t/**\n\t * Creates a loader instance for the given file.\n\t *\n\t * Requires {@link #createUploadAdapter} factory to be defined.\n\t *\n\t * @param {File|Promise.<File>} fileOrPromise Native File object or native Promise object which resolves to a File.\n\t * @returns {module:upload/filerepository~FileLoader|null}\n\t */\n\tcreateLoader( fileOrPromise ) {\n\t\tif ( !this.createUploadAdapter ) {\n\t\t\t/**\n\t\t\t * You need to enable an upload adapter in order to be able to upload files.\n\t\t\t *\n\t\t\t * This warning shows up when {@link module:upload/filerepository~FileRepository} is being used\n\t\t\t * without {@link #createUploadAdapter definining an upload adapter}.\n\t\t\t *\n\t\t\t * **If you see this warning when using one of the {@glink builds/index CKEditor 5 Builds}**\n\t\t\t * it means that you did not configure any of the upload adapters available by default in those builds.\n\t\t\t *\n\t\t\t * See the {@glink features/image-upload/image-upload comprehensive \"Image upload overview\"} to learn which upload\n\t\t\t * adapters are available in the builds and how to configure them.\n\t\t\t *\n\t\t\t * **If you see this warning when using a custom build** there is a chance that you enabled\n\t\t\t * a feature like {@link module:image/imageupload~ImageUpload},\n\t\t\t * or {@link module:image/imageupload/imageuploadui~ImageUploadUI} but you did not enable any upload adapter.\n\t\t\t * You can choose one of the existing upload adapters listed in the\n\t\t\t * {@glink features/image-upload/image-upload \"Image upload overview\"}.\n\t\t\t *\n\t\t\t * You can also implement your {@glink framework/guides/deep-dive/upload-adapter own image upload adapter}.\n\t\t\t *\n\t\t\t * @error filerepository-no-upload-adapter\n\t\t\t */\n\t\t\tlogWarning( 'filerepository-no-upload-adapter' );\n\n\t\t\treturn null;\n\t\t}\n\n\t\tconst loader = new FileLoader( Promise.resolve( fileOrPromise ), this.createUploadAdapter );\n\n\t\tthis.loaders.add( loader );\n\t\tthis._loadersMap.set( fileOrPromise, loader );\n\n\t\t// Store also file => loader mapping so loader can be retrieved by file instance returned upon Promise resolution.\n\t\tif ( fileOrPromise instanceof Promise ) {\n\t\t\tloader.file\n\t\t\t\t.then( file => {\n\t\t\t\t\tthis._loadersMap.set( file, loader );\n\t\t\t\t} )\n\t\t\t\t// Every then() must have a catch().\n\t\t\t\t// File loader state (and rejections) are handled in read() and upload().\n\t\t\t\t// Also, see the \"does not swallow the file promise rejection\" test.\n\t\t\t\t.catch( () => {} );\n\t\t}\n\n\t\tloader.on( 'change:uploaded', () => {\n\t\t\tlet aggregatedUploaded = 0;\n\n\t\t\tfor ( const loader of this.loaders ) {\n\t\t\t\taggregatedUploaded += loader.uploaded;\n\t\t\t}\n\n\t\t\tthis.uploaded = aggregatedUploaded;\n\t\t} );\n\n\t\tloader.on( 'change:uploadTotal', () => {\n\t\t\tlet aggregatedTotal = 0;\n\n\t\t\tfor ( const loader of this.loaders ) {\n\t\t\t\tif ( loader.uploadTotal ) {\n\t\t\t\t\taggregatedTotal += loader.uploadTotal;\n\t\t\t\t}\n\t\t\t}\n\n\t\t\tthis.uploadTotal = aggregatedTotal;\n\t\t} );\n\n\t\treturn loader;\n\t}\n\n\t/**\n\t * Destroys the given loader.\n\t *\n\t * @param {File|Promise|module:upload/filerepository~FileLoader} fileOrPromiseOrLoader File or Promise associated\n\t * with that loader or loader itself.\n\t */\n\tdestroyLoader( fileOrPromiseOrLoader ) {\n\t\tconst loader = fileOrPromiseOrLoader instanceof FileLoader ? fileOrPromiseOrLoader : this.getLoader( fileOrPromiseOrLoader );\n\n\t\tloader._destroy();\n\n\t\tthis.loaders.remove( loader );\n\n\t\tthis._loadersMap.forEach( ( value, key ) => {\n\t\t\tif ( value === loader ) {\n\t\t\t\tthis._loadersMap.delete( key );\n\t\t\t}\n\t\t} );\n\t}\n\n\t/**\n\t * Registers or deregisters pending action bound with upload progress.\n\t *\n\t * @private\n\t */\n\t_updatePendingAction() {\n\t\tconst pendingActions = this.editor.plugins.get( PendingActions );\n\n\t\tif ( this.loaders.length ) {\n\t\t\tif ( !this._pendingAction ) {\n\t\t\t\tconst t = this.editor.t;\n\t\t\t\tconst getMessage = value => `${ t( 'Upload in progress' ) } ${ parseInt( value ) }%.`;\n\n\t\t\t\tthis._pendingAction = pendingActions.add( getMessage( this.uploadedPercent ) );\n\t\t\t\tthis._pendingAction.bind( 'message' ).to( this, 'uploadedPercent', getMessage );\n\t\t\t}\n\t\t} else {\n\t\t\tpendingActions.remove( this._pendingAction );\n\t\t\tthis._pendingAction = null;\n\t\t}\n\t}\n}\n\nmix( FileRepository, ObservableMixin );\n\n/**\n * File loader class.\n *\n * It is used to control the process of reading the file and uploading it using the specified upload adapter.\n */\nclass FileLoader {\n\t/**\n\t * Creates a new instance of `FileLoader`.\n\t *\n\t * @param {Promise.<File>} filePromise A promise which resolves to a file instance.\n\t * @param {Function} uploadAdapterCreator The function which returns {@link module:upload/filerepository~UploadAdapter} instance.\n\t */\n\tconstructor( filePromise, uploadAdapterCreator ) {\n\t\t/**\n\t\t * Unique id of FileLoader instance.\n\t\t *\n\t\t * @readonly\n\t\t * @member {Number}\n\t\t */\n\t\tthis.id = uid();\n\n\t\t/**\n\t\t * Additional wrapper over the initial file promise passed to this loader.\n\t\t *\n\t\t * @protected\n\t\t * @member {module:upload/filerepository~FilePromiseWrapper}\n\t\t */\n\t\tthis._filePromiseWrapper = this._createFilePromiseWrapper( filePromise );\n\n\t\t/**\n\t\t * Adapter instance associated with this file loader.\n\t\t *\n\t\t * @private\n\t\t * @member {module:upload/filerepository~UploadAdapter}\n\t\t */\n\t\tthis._adapter = uploadAdapterCreator( this );\n\n\t\t/**\n\t\t * FileReader used by FileLoader.\n\t\t *\n\t\t * @protected\n\t\t * @member {module:upload/filereader~FileReader}\n\t\t */\n\t\tthis._reader = new FileReader();\n\n\t\t/**\n\t\t * Current status of FileLoader. It can be one of the following:\n\t\t *\n\t\t * * 'idle',\n\t\t * * 'reading',\n\t\t * * 'uploading',\n\t\t * * 'aborted',\n\t\t * * 'error'.\n\t\t *\n\t\t * When reading status can change in a following way:\n\t\t *\n\t\t * `idle` -> `reading` -> `idle`\n\t\t * `idle` -> `reading -> `aborted`\n\t\t * `idle` -> `reading -> `error`\n\t\t *\n\t\t * When uploading status can change in a following way:\n\t\t *\n\t\t * `idle` -> `uploading` -> `idle`\n\t\t * `idle` -> `uploading` -> `aborted`\n\t\t * `idle` -> `uploading` -> `error`\n\t\t *\n\t\t * @readonly\n\t\t * @observable\n\t\t * @member {String} #status\n\t\t */\n\t\tthis.set( 'status', 'idle' );\n\n\t\t/**\n\t\t * Number of bytes uploaded.\n\t\t *\n\t\t * @readonly\n\t\t * @observable\n\t\t * @member {Number} #uploaded\n\t\t */\n\t\tthis.set( 'uploaded', 0 );\n\n\t\t/**\n\t\t * Number of total bytes to upload.\n\t\t *\n\t\t * @readonly\n\t\t * @observable\n\t\t * @member {Number|null} #uploadTotal\n\t\t */\n\t\tthis.set( 'uploadTotal', null );\n\n\t\t/**\n\t\t * Upload progress in percents.\n\t\t *\n\t\t * @readonly\n\t\t * @observable\n\t\t * @member {Number} #uploadedPercent\n\t\t */\n\t\tthis.bind( 'uploadedPercent' ).to( this, 'uploaded', this, 'uploadTotal', ( uploaded, total ) => {\n\t\t\treturn total ? ( uploaded / total * 100 ) : 0;\n\t\t} );\n\n\t\t/**\n\t\t * Response of the upload.\n\t\t *\n\t\t * @readonly\n\t\t * @observable\n\t\t * @member {Object|null} #uploadResponse\n\t\t */\n\t\tthis.set( 'uploadResponse', null );\n\t}\n\n\t/**\n\t * A `Promise` which resolves to a `File` instance associated with this file loader.\n\t *\n\t * @type {Promise.<File|null>}\n\t */\n\tget file() {\n\t\tif ( !this._filePromiseWrapper ) {\n\t\t\t// Loader was destroyed, return promise which resolves to null.\n\t\t\treturn Promise.resolve( null );\n\t\t} else {\n\t\t\t// The `this._filePromiseWrapper.promise` is chained and not simply returned to handle a case when:\n\t\t\t//\n\t\t\t//\t\t* The `loader.file.then( ... )` is called by external code (returned promise is pending).\n\t\t\t//\t\t* Then `loader._destroy()` is called (call is synchronous) which destroys the `loader`.\n\t\t\t//\t\t* Promise returned by the first `loader.file.then( ... )` call is resolved.\n\t\t\t//\n\t\t\t// Returning `this._filePromiseWrapper.promise` will still resolve to a `File` instance so there\n\t\t\t// is an additional check needed in the chain to see if `loader` was destroyed in the meantime.\n\t\t\treturn this._filePromiseWrapper.promise.then( file => this._filePromiseWrapper ? file : null );\n\t\t}\n\t}\n\n\t/**\n\t * Returns the file data. To read its data, you need for first load the file\n\t * by using the {@link module:upload/filerepository~FileLoader#read `read()`} method.\n\t *\n\t * @type {File|undefined}\n\t */\n\tget data() {\n\t\treturn this._reader.data;\n\t}\n\n\t/**\n\t * Reads file using {@link module:upload/filereader~FileReader}.\n\t *\n\t * Throws {@link module:utils/ckeditorerror~CKEditorError CKEditorError} `filerepository-read-wrong-status` when status\n\t * is different than `idle`.\n\t *\n\t * Example usage:\n\t *\n\t *\tfileLoader.read()\n\t *\t\t.then( data => { ... } )\n\t *\t\t.catch( err => {\n\t *\t\t\tif ( err === 'aborted' ) {\n\t *\t\t\t\tconsole.log( 'Reading aborted.' );\n\t *\t\t\t} else {\n\t *\t\t\t\tconsole.log( 'Reading error.', err );\n\t *\t\t\t}\n\t *\t\t} );\n\t *\n\t * @returns {Promise.<String>} Returns promise that will be resolved with read data. Promise will be rejected if error\n\t * occurs or if read process is aborted.\n\t */\n\tread() {\n\t\tif ( this.status != 'idle' ) {\n\t\t\t/**\n\t\t\t * You cannot call read if the status is different than idle.\n\t\t\t *\n\t\t\t * @error filerepository-read-wrong-status\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'filerepository-read-wrong-status', this );\n\t\t}\n\n\t\tthis.status = 'reading';\n\n\t\treturn this.file\n\t\t\t.then( file => this._reader.read( file ) )\n\t\t\t.then( data => {\n\t\t\t\t// Edge case: reader was aborted after file was read - double check for proper status.\n\t\t\t\t// It can happen when image was deleted during its upload.\n\t\t\t\tif ( this.status !== 'reading' ) {\n\t\t\t\t\tthrow this.status;\n\t\t\t\t}\n\n\t\t\t\tthis.status = 'idle';\n\n\t\t\t\treturn data;\n\t\t\t} )\n\t\t\t.catch( err => {\n\t\t\t\tif ( err === 'aborted' ) {\n\t\t\t\t\tthis.status = 'aborted';\n\t\t\t\t\tthrow 'aborted';\n\t\t\t\t}\n\n\t\t\t\tthis.status = 'error';\n\t\t\t\tthrow this._reader.error ? this._reader.error : err;\n\t\t\t} );\n\t}\n\n\t/**\n\t * Reads file using the provided {@link module:upload/filerepository~UploadAdapter}.\n\t *\n\t * Throws {@link module:utils/ckeditorerror~CKEditorError CKEditorError} `filerepository-upload-wrong-status` when status\n\t * is different than `idle`.\n\t * Example usage:\n\t *\n\t *\tfileLoader.upload()\n\t *\t\t.then( data => { ... } )\n\t *\t\t.catch( e => {\n\t *\t\t\tif ( e === 'aborted' ) {\n\t *\t\t\t\tconsole.log( 'Uploading aborted.' );\n\t *\t\t\t} else {\n\t *\t\t\t\tconsole.log( 'Uploading error.', e );\n\t *\t\t\t}\n\t *\t\t} );\n\t *\n\t * @returns {Promise.<Object>} Returns promise that will be resolved with response data. Promise will be rejected if error\n\t * occurs or if read process is aborted.\n\t */\n\tupload() {\n\t\tif ( this.status != 'idle' ) {\n\t\t\t/**\n\t\t\t * You cannot call upload if the status is different than idle.\n\t\t\t *\n\t\t\t * @error filerepository-upload-wrong-status\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'filerepository-upload-wrong-status', this );\n\t\t}\n\n\t\tthis.status = 'uploading';\n\n\t\treturn this.file\n\t\t\t.then( () => this._adapter.upload() )\n\t\t\t.then( data => {\n\t\t\t\tthis.uploadResponse = data;\n\t\t\t\tthis.status = 'idle';\n\n\t\t\t\treturn data;\n\t\t\t} )\n\t\t\t.catch( err => {\n\t\t\t\tif ( this.status === 'aborted' ) {\n\t\t\t\t\tthrow 'aborted';\n\t\t\t\t}\n\n\t\t\t\tthis.status = 'error';\n\t\t\t\tthrow err;\n\t\t\t} );\n\t}\n\n\t/**\n\t * Aborts loading process.\n\t */\n\tabort() {\n\t\tconst status = this.status;\n\t\tthis.status = 'aborted';\n\n\t\tif ( !this._filePromiseWrapper.isFulfilled ) {\n\t\t\t// Edge case: file loader is aborted before read() is called\n\t\t\t// so it might happen that no one handled the rejection of this promise.\n\t\t\t// See https://github.com/ckeditor/ckeditor5-upload/pull/100\n\t\t\tthis._filePromiseWrapper.promise.catch( () => {} );\n\n\t\t\tthis._filePromiseWrapper.rejecter( 'aborted' );\n\t\t} else if ( status == 'reading' ) {\n\t\t\tthis._reader.abort();\n\t\t} else if ( status == 'uploading' && this._adapter.abort ) {\n\t\t\tthis._adapter.abort();\n\t\t}\n\n\t\tthis._destroy();\n\t}\n\n\t/**\n\t * Performs cleanup.\n\t *\n\t * @private\n\t */\n\t_destroy() {\n\t\tthis._filePromiseWrapper = undefined;\n\t\tthis._reader = undefined;\n\t\tthis._adapter = undefined;\n\t\tthis.uploadResponse = undefined;\n\t}\n\n\t/**\n\t * Wraps a given file promise into another promise giving additional\n\t * control (resolving, rejecting, checking if fulfilled) over it.\n\t *\n\t * @private\n\t * @param filePromise The initial file promise to be wrapped.\n\t * @returns {module:upload/filerepository~FilePromiseWrapper}\n\t */\n\t_createFilePromiseWrapper( filePromise ) {\n\t\tconst wrapper = {};\n\n\t\twrapper.promise = new Promise( ( resolve, reject ) => {\n\t\t\twrapper.rejecter = reject;\n\t\t\twrapper.isFulfilled = false;\n\n\t\t\tfilePromise\n\t\t\t\t.then( file => {\n\t\t\t\t\twrapper.isFulfilled = true;\n\t\t\t\t\tresolve( file );\n\t\t\t\t} )\n\t\t\t\t.catch( err => {\n\t\t\t\t\twrapper.isFulfilled = true;\n\t\t\t\t\treject( err );\n\t\t\t\t} );\n\t\t} );\n\n\t\treturn wrapper;\n\t}\n}\n\nmix( FileLoader, ObservableMixin );\n\n/**\n * Upload adapter interface used by the {@link module:upload/filerepository~FileRepository file repository}\n * to handle file upload. An upload adapter is a bridge between the editor and server that handles file uploads.\n * It should contain a logic necessary to initiate an upload process and monitor its progress.\n *\n * Learn how to develop your own upload adapter for CKEditor 5 in the\n * {@glink framework/guides/deep-dive/upload-adapter \"Custom upload adapter\" guide}.\n *\n * @interface UploadAdapter\n */\n\n/**\n * Executes the upload process.\n * This method should return a promise that will resolve when data will be uploaded to server. Promise should be\n * resolved with an object containing information about uploaded file:\n *\n *\t\t{\n *\t\t\tdefault: 'http://server/default-size.image.png'\n *\t\t}\n *\n * Additionally, other image sizes can be provided:\n *\n *\t\t{\n *\t\t\tdefault: 'http://server/default-size.image.png',\n *\t\t\t'160': 'http://server/size-160.image.png',\n *\t\t\t'500': 'http://server/size-500.image.png',\n *\t\t\t'1000': 'http://server/size-1000.image.png',\n *\t\t\t'1052': 'http://server/default-size.image.png'\n *\t\t}\n *\n * NOTE: When returning multiple images, the widest returned one should equal the default one. It is essential to\n * correctly set `width` attribute of the image. See this discussion:\n * https://github.com/ckeditor/ckeditor5-easy-image/issues/4 for more information.\n *\n * Take a look at {@link module:upload/filerepository~UploadAdapter example Adapter implementation} and\n * {@link module:upload/filerepository~FileRepository#createUploadAdapter createUploadAdapter method}.\n *\n * @method module:upload/filerepository~UploadAdapter#upload\n * @returns {Promise.<Object>} Promise that should be resolved when data is uploaded.\n */\n\n/**\n * Aborts the upload process.\n * After aborting it should reject promise returned from {@link #upload upload()}.\n *\n * Take a look at {@link module:upload/filerepository~UploadAdapter example Adapter implementation} and\n * {@link module:upload/filerepository~FileRepository#createUploadAdapter createUploadAdapter method}.\n *\n * @method module:upload/filerepository~UploadAdapter#abort\n */\n\n/**\n * Object returned by {@link module:upload/filerepository~FileLoader#_createFilePromiseWrapper} method\n * to add more control over the initial file promise passed to {@link module:upload/filerepository~FileLoader}.\n *\n * @protected\n * @typedef {Object} module:upload/filerepository~FilePromiseWrapper\n * @property {Promise.<File>} promise Wrapper promise which can be chained for further processing.\n * @property {Function} rejecter Rejects the promise when called.\n * @property {Boolean} isFulfilled Whether original promise is already fulfilled.\n */\n","/**\n * @license Copyright (c) 2003-2021, 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 upload/ui/filedialogbuttonview\n */\n\nimport ButtonView from '@ckeditor/ckeditor5-ui/src/button/buttonview';\nimport View from '@ckeditor/ckeditor5-ui/src/view';\n\n/**\n * The file dialog button view.\n *\n * This component provides a button that opens the native file selection dialog.\n * It can be used to implement the UI of a file upload feature.\n *\n *\t\tconst view = new FileDialogButtonView( locale );\n *\n *\t\tview.set( {\n *\t\t\tacceptedType: 'image/*',\n *\t\t\tallowMultipleFiles: true\n *\t\t} );\n *\n *\t\tview.buttonView.set( {\n *\t\t\tlabel: t( 'Insert image' ),\n *\t\t\ticon: imageIcon,\n *\t\t\ttooltip: true\n *\t\t} );\n *\n *\t\tview.on( 'done', ( evt, files ) => {\n *\t\t\tfor ( const file of Array.from( files ) ) {\n *\t\t\t\tconsole.log( 'Selected file', file );\n *\t\t\t}\n *\t\t} );\n *\n * @extends module:ui/view~View\n */\nexport default class FileDialogButtonView extends View {\n\t/**\n\t * @inheritDoc\n\t */\n\tconstructor( locale ) {\n\t\tsuper( locale );\n\n\t\t/**\n\t\t * The button view of the component.\n\t\t *\n\t\t * @member {module:ui/button/buttonview~ButtonView}\n\t\t */\n\t\tthis.buttonView = new ButtonView( locale );\n\n\t\t/**\n\t\t * A hidden `<input>` view used to execute file dialog.\n\t\t *\n\t\t * @protected\n\t\t * @member {module:upload/ui/filedialogbuttonview~FileInputView}\n\t\t */\n\t\tthis._fileInputView = new FileInputView( locale );\n\n\t\t/**\n\t\t * Accepted file types. Can be provided in form of file extensions, media type or one of:\n\t\t * * `audio/*`,\n\t\t * * `video/*`,\n\t\t * * `image/*`.\n\t\t *\n\t\t * @observable\n\t\t * @member {String} #acceptedType\n\t\t */\n\t\tthis._fileInputView.bind( 'acceptedType' ).to( this );\n\n\t\t/**\n\t\t * Indicates if multiple files can be selected. Defaults to `true`.\n\t\t *\n\t\t * @observable\n\t\t * @member {Boolean} #allowMultipleFiles\n\t\t */\n\t\tthis._fileInputView.bind( 'allowMultipleFiles' ).to( this );\n\n\t\t/**\n\t\t * Fired when file dialog is closed with file selected.\n\t\t *\n\t\t *\t\tview.on( 'done', ( evt, files ) => {\n\t\t *\t\t\tfor ( const file of files ) {\n\t\t *\t\t\t\tconsole.log( 'Selected file', file );\n\t\t *\t\t\t}\n\t\t *\t\t}\n\t\t *\n\t\t * @event done\n\t\t * @param {Array.<File>} files Array of selected files.\n\t\t */\n\t\tthis._fileInputView.delegate( 'done' ).to( this );\n\n\t\tthis.setTemplate( {\n\t\t\ttag: 'span',\n\t\t\tattributes: {\n\t\t\t\tclass: 'ck-file-dialog-button'\n\t\t\t},\n\t\t\tchildren: [\n\t\t\t\tthis.buttonView,\n\t\t\t\tthis._fileInputView\n\t\t\t]\n\t\t} );\n\n\t\tthis.buttonView.on( 'execute', () => {\n\t\t\tthis._fileInputView.open();\n\t\t} );\n\t}\n\n\t/**\n\t * Focuses the {@link #buttonView}.\n\t */\n\tfocus() {\n\t\tthis.buttonView.focus();\n\t}\n}\n\n/**\n * The hidden file input view class.\n *\n * @private\n * @extends module:ui/view~View\n */\nclass FileInputView extends View {\n\t/**\n\t * @inheritDoc\n\t */\n\tconstructor( locale ) {\n\t\tsuper( locale );\n\n\t\t/**\n\t\t * Accepted file types. Can be provided in form of file extensions, media type or one of:\n\t\t * * `audio/*`,\n\t\t * * `video/*`,\n\t\t * * `image/*`.\n\t\t *\n\t\t * @observable\n\t\t * @member {String} #acceptedType\n\t\t */\n\t\tthis.set( 'acceptedType' );\n\n\t\t/**\n\t\t * Indicates if multiple files can be selected. Defaults to `false`.\n\t\t *\n\t\t * @observable\n\t\t * @member {Boolean} #allowMultipleFiles\n\t\t */\n\t\tthis.set( 'allowMultipleFiles', false );\n\n\t\tconst bind = this.bindTemplate;\n\n\t\tthis.setTemplate( {\n\t\t\ttag: 'input',\n\n\t\t\tattributes: {\n\t\t\t\tclass: [\n\t\t\t\t\t'ck-hidden'\n\t\t\t\t],\n\t\t\t\ttype: 'file',\n\t\t\t\ttabindex: '-1',\n\t\t\t\taccept: bind.to( 'acceptedType' ),\n\t\t\t\tmultiple: bind.to( 'allowMultipleFiles' )\n\t\t\t},\n\n\t\t\ton: {\n\t\t\t\t// Removing from code coverage since we cannot programmatically set input element files.\n\t\t\t\tchange: bind.to( /* istanbul ignore next */ () => {\n\t\t\t\t\tif ( this.element && this.element.files && this.element.files.length ) {\n\t\t\t\t\t\tthis.fire( 'done', this.element.files );\n\t\t\t\t\t}\n\n\t\t\t\t\tthis.element.value = '';\n\t\t\t\t} )\n\t\t\t}\n\t\t} );\n\t}\n\n\t/**\n\t * Opens file dialog.\n\t */\n\topen() {\n\t\tthis.element.click();\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2021, 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 upload/adapters/base64uploadadapter\n */\n\n/* globals window */\n\nimport Plugin from '@ckeditor/ckeditor5-core/src/plugin';\nimport FileRepository from '../filerepository';\n\n/**\n * A plugin that converts images inserted into the editor into [Base64 strings](https://en.wikipedia.org/wiki/Base64)\n * in the {@glink builds/guides/integration/saving-data editor output}.\n *\n * This kind of image upload does not require server processing – images are stored with the rest of the text and\n * displayed by the web browser without additional requests.\n *\n * Check out the {@glink features/image-upload/image-upload comprehensive \"Image upload overview\"} to learn about\n * other ways to upload images into CKEditor 5.\n *\n * @extends module:core/plugin~Plugin\n */\nexport default class Base64UploadAdapter extends Plugin {\n\t/**\n\t * @inheritDoc\n\t */\n\tstatic get requires() {\n\t\treturn [ FileRepository ];\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tstatic get pluginName() {\n\t\treturn 'Base64UploadAdapter';\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tinit() {\n\t\tthis.editor.plugins.get( FileRepository ).createUploadAdapter = loader => new Adapter( loader );\n\t}\n}\n\n/**\n * The upload adapter that converts images inserted into the editor into Base64 strings.\n *\n * @private\n * @implements module:upload/filerepository~UploadAdapter\n */\nclass Adapter {\n\t/**\n\t * Creates a new adapter instance.\n\t *\n\t * @param {module:upload/filerepository~FileLoader} loader\n\t */\n\tconstructor( loader ) {\n\t\t/**\n\t\t * `FileLoader` instance to use during the upload.\n\t\t *\n\t\t * @member {module:upload/filerepository~FileLoader} #loader\n\t\t */\n\t\tthis.loader = loader;\n\t}\n\n\t/**\n\t * Starts the upload process.\n\t *\n\t * @see module:upload/filerepository~UploadAdapter#upload\n\t * @returns {Promise}\n\t */\n\tupload() {\n\t\treturn new Promise( ( resolve, reject ) => {\n\t\t\tconst reader = this.reader = new window.FileReader();\n\n\t\t\treader.addEventListener( 'load', () => {\n\t\t\t\tresolve( { default: reader.result } );\n\t\t\t} );\n\n\t\t\treader.addEventListener( 'error', err => {\n\t\t\t\treject( err );\n\t\t\t} );\n\n\t\t\treader.addEventListener( 'abort', () => {\n\t\t\t\treject();\n\t\t\t} );\n\n\t\t\tthis.loader.file.then( file => {\n\t\t\t\treader.readAsDataURL( file );\n\t\t\t} );\n\t\t} );\n\t}\n\n\t/**\n\t * Aborts the upload process.\n\t *\n\t * @see module:upload/filerepository~UploadAdapter#abort\n\t * @returns {Promise}\n\t */\n\tabort() {\n\t\tthis.reader.abort();\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2021, 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 upload/adapters/simpleuploadadapter\n */\n\n/* globals XMLHttpRequest, FormData */\n\nimport Plugin from '@ckeditor/ckeditor5-core/src/plugin';\nimport FileRepository from '../filerepository';\nimport { logWarning } from '@ckeditor/ckeditor5-utils/src/ckeditorerror';\n\n/**\n * The Simple upload adapter allows uploading images to an application running on your server using\n * the [`XMLHttpRequest`](https://developer.mozilla.org/en-US/docs/Web/API/XMLHttpRequest) API with a\n * minimal {@link module:upload/adapters/simpleuploadadapter~SimpleUploadConfig editor configuration}.\n *\n *\t\tClassicEditor\n *\t\t\t.create( document.querySelector( '#editor' ), {\n *\t\t\t\tsimpleUpload: {\n *\t\t\t\t\tuploadUrl: 'http://example.com',\n *\t\t\t\t\theaders: {\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\t.then( ... )\n *\t\t\t.catch( ... );\n *\n * See the {@glink features/image-upload/simple-upload-adapter \"Simple upload adapter\"} guide to learn how to\n * learn more about the feature (configuration, server–side requirements, etc.).\n *\n * Check out the {@glink features/image-upload/image-upload comprehensive \"Image upload overview\"} to learn about\n * other ways to upload images into CKEditor 5.\n *\n * @extends module:core/plugin~Plugin\n */\nexport default class SimpleUploadAdapter extends Plugin {\n\t/**\n\t * @inheritDoc\n\t */\n\tstatic get requires() {\n\t\treturn [ FileRepository ];\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tstatic get pluginName() {\n\t\treturn 'SimpleUploadAdapter';\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tinit() {\n\t\tconst options = this.editor.config.get( 'simpleUpload' );\n\n\t\tif ( !options ) {\n\t\t\treturn;\n\t\t}\n\n\t\tif ( !options.uploadUrl ) {\n\t\t\t/**\n\t\t\t * The {@link module:upload/adapters/simpleuploadadapter~SimpleUploadConfig#uploadUrl `config.simpleUpload.uploadUrl`}\n\t\t\t * configuration required by the {@link module:upload/adapters/simpleuploadadapter~SimpleUploadAdapter `SimpleUploadAdapter`}\n\t\t\t * is missing. Make sure the correct URL is specified for the image upload to work properly.\n\t\t\t *\n\t\t\t * @error simple-upload-adapter-missing-uploadurl\n\t\t\t */\n\t\t\tlogWarning( 'simple-upload-adapter-missing-uploadurl' );\n\n\t\t\treturn;\n\t\t}\n\n\t\tthis.editor.plugins.get( FileRepository ).createUploadAdapter = loader => {\n\t\t\treturn new Adapter( loader, options );\n\t\t};\n\t}\n}\n\n/**\n * Upload adapter.\n *\n * @private\n * @implements module:upload/filerepository~UploadAdapter\n */\nclass Adapter {\n\t/**\n\t * Creates a new adapter instance.\n\t *\n\t * @param {module:upload/filerepository~FileLoader} loader\n\t * @param {module:upload/adapters/simpleuploadadapter~SimpleUploadConfig} options\n\t */\n\tconstructor( loader, options ) {\n\t\t/**\n\t\t * FileLoader instance to use during the upload.\n\t\t *\n\t\t * @member {module:upload/filerepository~FileLoader} #loader\n\t\t */\n\t\tthis.loader = loader;\n\n\t\t/**\n\t\t * The configuration of the adapter.\n\t\t *\n\t\t * @member {module:upload/adapters/simpleuploadadapter~SimpleUploadConfig} #options\n\t\t */\n\t\tthis.options = options;\n\t}\n\n\t/**\n\t * Starts the upload process.\n\t *\n\t * @see module:upload/filerepository~UploadAdapter#upload\n\t * @returns {Promise}\n\t */\n\tupload() {\n\t\treturn this.loader.file\n\t\t\t.then( file => new Promise( ( resolve, reject ) => {\n\t\t\t\tthis._initRequest();\n\t\t\t\tthis._initListeners( resolve, reject, file );\n\t\t\t\tthis._sendRequest( file );\n\t\t\t} ) );\n\t}\n\n\t/**\n\t * Aborts the upload process.\n\t *\n\t * @see module:upload/filerepository~UploadAdapter#abort\n\t * @returns {Promise}\n\t */\n\tabort() {\n\t\tif ( this.xhr ) {\n\t\t\tthis.xhr.abort();\n\t\t}\n\t}\n\n\t/**\n\t * Initializes the `XMLHttpRequest` object using the URL specified as\n\t * {@link module:upload/adapters/simpleuploadadapter~SimpleUploadConfig#uploadUrl `simpleUpload.uploadUrl`} in the editor's\n\t * configuration.\n\t *\n\t * @private\n\t */\n\t_initRequest() {\n\t\tconst xhr = this.xhr = new XMLHttpRequest();\n\n\t\txhr.open( 'POST', this.options.uploadUrl, true );\n\t\txhr.responseType = 'json';\n\t}\n\n\t/**\n\t * Initializes XMLHttpRequest listeners\n\t *\n\t * @private\n\t * @param {Function} resolve Callback function to be called when the request is successful.\n\t * @param {Function} reject Callback function to be called when the request cannot be completed.\n\t * @param {File} file Native File object.\n\t */\n\t_initListeners( resolve, reject, file ) {\n\t\tconst xhr = this.xhr;\n\t\tconst loader = this.loader;\n\t\tconst genericErrorText = `Couldn't upload file: ${ file.name }.`;\n\n\t\txhr.addEventListener( 'error', () => reject( genericErrorText ) );\n\t\txhr.addEventListener( 'abort', () => reject() );\n\t\txhr.addEventListener( 'load', () => {\n\t\t\tconst response = xhr.response;\n\n\t\t\tif ( !response || response.error ) {\n\t\t\t\treturn reject( response && response.error && response.error.message ? response.error.message : genericErrorText );\n\t\t\t}\n\n\t\t\tresolve( response.url ? { default: response.url } : response.urls );\n\t\t} );\n\n\t\t// Upload progress when it is supported.\n\t\t/* istanbul ignore else */\n\t\tif ( xhr.upload ) {\n\t\t\txhr.upload.addEventListener( 'progress', evt => {\n\t\t\t\tif ( evt.lengthComputable ) {\n\t\t\t\t\tloader.uploadTotal = evt.total;\n\t\t\t\t\tloader.uploaded = evt.loaded;\n\t\t\t\t}\n\t\t\t} );\n\t\t}\n\t}\n\n\t/**\n\t * Prepares the data and sends the request.\n\t *\n\t * @private\n\t * @param {File} file File instance to be uploaded.\n\t */\n\t_sendRequest( file ) {\n\t\t// Set headers if specified.\n\t\tconst headers = this.options.headers || {};\n\n\t\t// Use the withCredentials flag if specified.\n\t\tconst withCredentials = this.options.withCredentials || false;\n\n\t\tfor ( const headerName of Object.keys( headers ) ) {\n\t\t\tthis.xhr.setRequestHeader( headerName, headers[ headerName ] );\n\t\t}\n\n\t\tthis.xhr.withCredentials = withCredentials;\n\n\t\t// Prepare the form data.\n\t\tconst data = new FormData();\n\n\t\tdata.append( 'upload', file );\n\n\t\t// Send the request.\n\t\tthis.xhr.send( data );\n\t}\n}\n\n/**\n * The configuration of the {@link module:upload/adapters/simpleuploadadapter~SimpleUploadAdapter simple upload adapter}.\n *\n *\t\tClassicEditor\n *\t\t\t.create( editorElement, {\n *\t\t\t\tsimpleUpload: {\n *\t\t\t\t\t// The URL the images are uploaded to.\n *\t\t\t\t\tuploadUrl: 'http://example.com',\n *\n *\t\t\t\t\t// Headers sent along with the XMLHttpRequest to the upload server.\n *\t\t\t\t\theaders: {\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\t.then( ... )\n *\t\t\t.catch( ... );\n *\n * See the {@glink features/image-upload/simple-upload-adapter \"Simple upload adapter\"} guide to learn more.\n *\n * See {@link module:core/editor/editorconfig~EditorConfig all editor configuration options}.\n *\n * @interface SimpleUploadConfig\n */\n\n/**\n * The configuration of the {@link module:upload/adapters/simpleuploadadapter~SimpleUploadAdapter simple upload adapter}.\n *\n * Read more in {@link module:upload/adapters/simpleuploadadapter~SimpleUploadConfig}.\n *\n * @member {module:upload/adapters/simpleuploadadapter~SimpleUploadConfig} module:core/editor/editorconfig~EditorConfig#simpleUpload\n */\n\n/**\n * The path (URL) to the server (application) which handles the file upload. When specified, enables the automatic\n * upload of resources (images) inserted into the editor content.\n *\n * Learn more about the server application requirements in the\n * {@glink features/image-upload/simple-upload-adapter#server-side-configuration \"Server-side configuration\"} section\n * of the feature guide.\n *\n * @member {String} module:upload/adapters/simpleuploadadapter~SimpleUploadConfig#uploadUrl\n */\n\n/**\n * An object that defines additional [headers](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers) sent with\n * the request to the server during the upload. This is the right place to implement security mechanisms like\n * authentication and [CSRF](https://developer.mozilla.org/en-US/docs/Glossary/CSRF) protection.\n *\n *\t\tClassicEditor\n *\t\t\t.create( editorElement, {\n *\t\t\t\tsimpleUpload: {\n *\t\t\t\t\theaders: {\n *\t\t\t\t\t\t'X-CSRF-TOKEN': 'CSRF-Token',\n *\t\t\t\t\t\tAuthorization: 'Bearer <JSON Web Token>'\n *\t\t\t\t\t}\n *\t\t\t\t}\n *\t\t\t} );\n *\t\t\t.then( ... )\n *\t\t\t.catch( ... );\n *\n * Learn more about the server application requirements in the\n * {@glink features/image-upload/simple-upload-adapter#server-side-configuration \"Server-side configuration\"} section\n * of the feature guide.\n *\n * @member {Object.<String, String>} module:upload/adapters/simpleuploadadapter~SimpleUploadConfig#headers\n */\n\n/**\n * This flag enables the\n * [`withCredentials`](https://developer.mozilla.org/en-US/docs/Web/API/XMLHttpRequest/withCredentials)\n * property of the request sent to the server during the upload. It affects cross-site requests only and, for instance,\n * allows credentials such as cookies to be sent along with the request.\n *\n *\t\tClassicEditor\n *\t\t\t.create( editorElement, {\n *\t\t\t\tsimpleUpload: {\n *\t\t\t\t\twithCredentials: true\n *\t\t\t\t}\n *\t\t\t} );\n *\t\t\t.then( ... )\n *\t\t\t.catch( ... );\n *\n * Learn more about the server application requirements in the\n * {@glink features/image-upload/simple-upload-adapter#server-side-configuration \"Server-side configuration\"} section\n * of the feature guide.\n *\n * @member {Boolean} [module:upload/adapters/simpleuploadadapter~SimpleUploadConfig#withCredentials=false]\n */\n","/**\n * @license Copyright (c) 2003-2021, 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 upload\n */\n\nexport { default as FileRepository } from './filerepository';\nexport { default as FileDialogButtonView } from './ui/filedialogbuttonview';\nexport { default as Base64UploadAdapter } from './adapters/base64uploadadapter';\nexport { default as SimpleUploadAdapter } from './adapters/simpleuploadadapter';\n","/**\n * @license Copyright (c) 2003-2021, 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) 2003-2021, 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) 2003-2021, 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) 2003-2021, 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) 2003-2021, 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","/**\n * @license Copyright (c) 2003-2021, 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) 2003-2021, 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) 2003-2021, 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) 2003-2021, 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/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. Keep in mind that for common integration issues which should not\n * stop editor initialization (like missing upload adapter, wrong name of a toolbar component) we use\n * {@link module:utils/ckeditorerror~logWarning `logWarning()`} and\n * {@link module:utils/ckeditorerror~logError `logError()`}\n * to improve developers experience and let them see the a working editor as soon as possible.\n *\n *\t\t/**\n *\t\t * Error thrown when a plugin cannot be loaded due to JavaScript errors, lack of plugins with a given name, etc.\n *\t\t *\n *\t\t * @error plugin-load\n *\t\t * @param pluginName The name of the plugin that could not be loaded.\n *\t\t * @param moduleName The name of the module which tried to load this plugin.\n *\t\t * /\n *\t\tthrow new CKEditorError( 'plugin-load', {\n *\t\t\tpluginName: 'foo',\n *\t\t\tmoduleName: 'bar'\n *\t\t} );\n *\n * @extends Error\n */\nexport default class CKEditorError extends Error {\n\t/**\n\t * Creates an instance of the CKEditorError class.\n\t *\n\t * @param {String} errorName The error id in an `error-name` format. A link to this error documentation page will be added\n\t * to the thrown error's `message`.\n\t * @param {Object|null} context A context of the error by which the {@link module:watchdog/watchdog~Watchdog watchdog}\n\t * is able to determine which editor crashed. It should be an editor instance or a property connected to it. It can be also\n\t * a `null` value if the editor should not be restarted in case of the error (e.g. during the editor initialization).\n\t * The error context should be checked using the `areConnectedThroughProperties( editor, context )` utility\n\t * to check if the object works as the context.\n\t * @param {Object} [data] Additional data describing the error. A stringified version of this object\n\t * will be appended to the error message, so the data are quickly visible in the console. The original\n\t * data object will also be later available under the {@link #data} property.\n\t */\n\tconstructor( errorName, context, data ) {\n\t\tconst message = `${ errorName }${ ( data ? ` ${ JSON.stringify( data ) }` : '' ) }${ getLinkToDocumentationMessage( errorName ) }`;\n\n\t\tsuper( message );\n\n\t\t/**\n\t\t * @type {String}\n\t\t */\n\t\tthis.name = 'CKEditorError';\n\n\t\t/**\n\t\t * A context of the error by which the Watchdog is able to determine which editor crashed.\n\t\t *\n\t\t * @type {Object|null}\n\t\t */\n\t\tthis.context = context;\n\n\t\t/**\n\t\t * The additional error data passed to the constructor. 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","module.exports = \"<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>\""],"sourceRoot":""}