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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/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}). 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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/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/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"],"sourceRoot":""}