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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/first\n */\n\n/**\n * Returns first item of the given `iterable`.\n *\n * @param {Iterable.<*>} iterable\n * @returns {*}\n */\nexport default function first( iterable ) {\n\tconst iteratorItem = iterable.next();\n\n\tif ( iteratorItem.done ) {\n\t\treturn null;\n\t}\n\n\treturn iteratorItem.value;\n}\n","/**\n * @license Copyright (c) 2003-2021, 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/toarray\n */\n\n/**\n * Transforms any value to an array. If the provided value is already an array, it is returned unchanged.\n *\n * @param {*} data The value to transform to an array.\n * @returns {Array} An array created from data.\n */\nexport default function toArray( data ) {\n\treturn Array.isArray( data ) ? data : [ 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/* globals navigator:false */\n\n/**\n * @module utils/env\n */\n\nconst userAgent = navigator.userAgent.toLowerCase();\n\n/**\n * A namespace containing environment and browser information.\n *\n * @namespace\n */\nconst env = {\n\t/**\n\t * Indicates that the application is running on Macintosh.\n\t *\n\t * @static\n\t * @type {Boolean}\n\t */\n\tisMac: isMac( userAgent ),\n\n\t/**\n\t * Indicates that the application is running in Firefox (Gecko).\n\t *\n\t * @static\n\t * @type {Boolean}\n\t */\n\tisGecko: isGecko( userAgent ),\n\n\t/**\n\t * Indicates that the application is running in Safari.\n\t *\n\t * @static\n\t * @type {Boolean}\n\t */\n\tisSafari: isSafari( userAgent ),\n\n\t/**\n\t * Indicates that the application is running on Android mobile device.\n\t *\n\t * @static\n\t * @type {Boolean}\n\t */\n\tisAndroid: isAndroid( userAgent ),\n\n\t/**\n\t * Indicates that the application is running in a browser using the Blink engine.\n\t *\n\t * @static\n\t * @type {Boolean}\n\t */\n\tisBlink: isBlink( userAgent ),\n\n\t/**\n\t * Environment features information.\n\t *\n\t * @memberOf module:utils/env~env\n\t * @namespace\n\t */\n\tfeatures: {\n\t\t/**\n\t\t * Indicates that the environment supports ES2018 Unicode property escapes — like `\\p{P}` or `\\p{L}`.\n\t\t * More information about unicode properties might be found\n\t\t * [in Unicode Standard Annex #44](https://www.unicode.org/reports/tr44/#GC_Values_Table).\n\t\t *\n\t\t * @type {Boolean}\n\t\t */\n\t\tisRegExpUnicodePropertySupported: isRegExpUnicodePropertySupported()\n\t}\n};\n\nexport default env;\n\n/**\n * Checks if User Agent represented by the string is running on Macintosh.\n *\n * @param {String} userAgent **Lowercase** `navigator.userAgent` string.\n * @returns {Boolean} Whether User Agent is running on Macintosh or not.\n */\nexport function isMac( userAgent ) {\n\treturn userAgent.indexOf( 'macintosh' ) > -1;\n}\n\n/**\n * Checks if User Agent represented by the string is Firefox (Gecko).\n *\n * @param {String} userAgent **Lowercase** `navigator.userAgent` string.\n * @returns {Boolean} Whether User Agent is Firefox or not.\n */\nexport function isGecko( userAgent ) {\n\treturn !!userAgent.match( /gecko\\/\\d+/ );\n}\n\n/**\n * Checks if User Agent represented by the string is Safari.\n *\n * @param {String} userAgent **Lowercase** `navigator.userAgent` string.\n * @returns {Boolean} Whether User Agent is Safari or not.\n */\nexport function isSafari( userAgent ) {\n\treturn userAgent.indexOf( ' applewebkit/' ) > -1 && userAgent.indexOf( 'chrome' ) === -1;\n}\n\n/**\n * Checks if User Agent represented by the string is Android mobile device.\n *\n * @param {String} userAgent **Lowercase** `navigator.userAgent` string.\n * @returns {Boolean} Whether User Agent is Safari or not.\n */\nexport function isAndroid( userAgent ) {\n\treturn userAgent.indexOf( 'android' ) > -1;\n}\n\n/**\n * Checks if User Agent represented by the string is Blink engine.\n *\n * @param {String} userAgent **Lowercase** `navigator.userAgent` string.\n * @returns {Boolean} Whether User Agent is Blink engine or not.\n */\nexport function isBlink( userAgent ) {\n\t// The Edge browser before switching to the Blink engine used to report itself as Chrome (and \"Edge/\")\n\t// but after switching to the Blink it replaced \"Edge/\" with \"Edg/\".\n\treturn userAgent.indexOf( 'chrome/' ) > -1 && userAgent.indexOf( 'edge/' ) < 0;\n}\n\n/**\n * Checks if the current environment supports ES2018 Unicode properties like `\\p{P}` or `\\p{L}`.\n * More information about unicode properties might be found\n * [in Unicode Standard Annex #44](https://www.unicode.org/reports/tr44/#GC_Values_Table).\n *\n * @returns {Boolean}\n */\nexport function isRegExpUnicodePropertySupported() {\n\tlet isSupported = false;\n\n\t// Feature detection for Unicode properties. Added in ES2018. Currently Firefox does not support it.\n\t// See https://github.com/ckeditor/ckeditor5-mention/issues/44#issuecomment-487002174.\n\n\ttry {\n\t\t// Usage of regular expression literal cause error during build (ckeditor/ckeditor5-dev#534).\n\t\tisSupported = 'ć'.search( new RegExp( '[\\\\p{L}]', 'u' ) ) === 0;\n\t} catch ( error ) {\n\t\t// Firefox throws a SyntaxError when the group is unsupported.\n\t}\n\n\treturn isSupported;\n}\n","/**\n * @license Copyright (c) 2003-2021, 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/priorities\n */\n\n/**\n * String representing a priority value.\n *\n * @typedef {'highest'|'high'|'normal'|'low'|'lowest'} module:utils/priorities~PriorityString\n */\n\n/**\n * Provides group of constants to use instead of hardcoding numeric priority values.\n *\n * @namespace\n */\nconst priorities = {\n\t/**\n\t * Converts a string with priority name to it's numeric value. If `Number` is given, it just returns it.\n\t *\n\t * @static\n\t * @param {module:utils/priorities~PriorityString|Number} priority Priority to convert.\n\t * @returns {Number} Converted priority.\n\t */\n\tget( priority ) {\n\t\tif ( typeof priority != 'number' ) {\n\t\t\treturn this[ priority ] || this.normal;\n\t\t} else {\n\t\t\treturn priority;\n\t\t}\n\t},\n\n\thighest: 100000,\n\thigh: 1000,\n\tnormal: 0,\n\tlow: -1000,\n\tlowest: -100000\n};\n\nexport default priorities;\n","/**\n * @license Copyright (c) 2003-2021, 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/mix\n */\n\n/**\n * Copies enumerable properties and symbols from the objects given as 2nd+ parameters to the\n * prototype of first object (a constructor).\n *\n *\t\tclass Editor {\n *\t\t\t...\n *\t\t}\n *\n *\t\tconst SomeMixin = {\n *\t\t\ta() {\n *\t\t\t\treturn 'a';\n *\t\t\t}\n *\t\t};\n *\n *\t\tmix( Editor, SomeMixin, ... );\n *\n *\t\tnew Editor().a(); // -> 'a'\n *\n * Note: Properties which already exist in the base class will not be overriden.\n *\n * @param {Function} [baseClass] Class which prototype will be extended.\n * @param {Object} [...mixins] Objects from which to get properties.\n */\nexport default function mix( baseClass, ...mixins ) {\n\tmixins.forEach( mixin => {\n\t\tObject.getOwnPropertyNames( mixin ).concat( Object.getOwnPropertySymbols( mixin ) )\n\t\t\t.forEach( key => {\n\t\t\t\tif ( key in baseClass.prototype ) {\n\t\t\t\t\treturn;\n\t\t\t\t}\n\n\t\t\t\tconst sourceDescriptor = Object.getOwnPropertyDescriptor( mixin, key );\n\t\t\t\tsourceDescriptor.enumerable = false;\n\n\t\t\t\tObject.defineProperty( baseClass.prototype, key, sourceDescriptor );\n\t\t\t} );\n\t} );\n}\n","/*!\n * @license Copyright (c) 2003-2020, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n!function(t,e){\"object\"==typeof exports&&\"object\"==typeof module?module.exports=e(require(\"vue\")):\"function\"==typeof define&&define.amd?define([\"vue\"],e):\"object\"==typeof exports?exports.CKEditor=e(require(\"vue\")):t.CKEditor=e(t.Vue)}(window,(function(t){return function(t){var e={};function n(r){if(e[r])return e[r].exports;var i=e[r]={i:r,l:!1,exports:{}};return t[r].call(i.exports,i,i.exports,n),i.l=!0,i.exports}return n.m=t,n.c=e,n.d=function(t,e,r){n.o(t,e)||Object.defineProperty(t,e,{enumerable:!0,get:r})},n.r=function(t){\"undefined\"!=typeof Symbol&&Symbol.toStringTag&&Object.defineProperty(t,Symbol.toStringTag,{value:\"Module\"}),Object.defineProperty(t,\"__esModule\",{value:!0})},n.t=function(t,e){if(1&e&&(t=n(t)),8&e)return t;if(4&e&&\"object\"==typeof t&&t&&t.__esModule)return t;var r=Object.create(null);if(n.r(r),Object.defineProperty(r,\"default\",{enumerable:!0,value:t}),2&e&&\"string\"!=typeof t)for(var i in t)n.d(r,i,function(e){return t[e]}.bind(null,i));return r},n.n=function(t){var e=t&&t.__esModule?function(){return t.default}:function(){return t};return n.d(e,\"a\",e),e},n.o=function(t,e){return Object.prototype.hasOwnProperty.call(t,e)},n.p=\"\",n(n.s=3)}([function(e,n){e.exports=t},function(t,e,n){\"use strict\";(function(t){var n=\"object\"==typeof t&&t&&t.Object===Object&&t;e.a=n}).call(this,n(2))},function(t,e){var n;n=function(){return this}();try{n=n||new Function(\"return this\")()}catch(t){\"object\"==typeof window&&(n=window)}t.exports=n},function(t,e,n){\"use strict\";n.r(e);var r=n(0),i=n.n(r);var o=function(t){var e=typeof t;return null!=t&&(\"object\"==e||\"function\"==e)},u=n(1),a=\"object\"==typeof self&&self&&self.Object===Object&&self,c=u.a||a||Function(\"return this\")(),s=function(){return c.Date.now()},f=c.Symbol,l=Object.prototype,d=l.hasOwnProperty,p=l.toString,v=f?f.toStringTag:void 0;var y=function(t){var e=d.call(t,v),n=t[v];try{t[v]=void 0;var r=!0}catch(t){}var i=p.call(t);return r&&(e?t[v]=n:delete t[v]),i},h=Object.prototype.toString;var b=function(t){return h.call(t)},m=f?f.toStringTag:void 0;var g=function(t){return null==t?void 0===t?\"[object Undefined]\":\"[object Null]\":m&&m in Object(t)?y(t):b(t)};var j=function(t){return null!=t&&\"object\"==typeof t};var $=function(t){return\"symbol\"==typeof t||j(t)&&\"[object Symbol]\"==g(t)},O=/^\\s+|\\s+$/g,w=/^[-+]0x[0-9a-f]+$/i,_=/^0b[01]+$/i,x=/^0o[0-7]+$/i,S=parseInt;var E=function(t){if(\"number\"==typeof t)return t;if($(t))return NaN;if(o(t)){var e=\"function\"==typeof t.valueOf?t.valueOf():t;t=o(e)?e+\"\":e}if(\"string\"!=typeof t)return 0===t?t:+t;t=t.replace(O,\"\");var n=_.test(t);return n||x.test(t)?S(t.slice(2),n?2:8):w.test(t)?NaN:+t},T=Math.max,D=Math.min;var N=function(t,e,n){var r,i,u,a,c,f,l=0,d=!1,p=!1,v=!0;if(\"function\"!=typeof t)throw new TypeError(\"Expected a function\");function y(e){var n=r,o=i;return r=i=void 0,l=e,a=t.apply(o,n)}function h(t){return l=t,c=setTimeout(m,e),d?y(t):a}function b(t){var n=t-f;return void 0===f||n>=e||n<0||p&&t-l>=u}function m(){var t=s();if(b(t))return g(t);c=setTimeout(m,function(t){var n=e-(t-f);return p?D(n,u-(t-l)):n}(t))}function g(t){return c=void 0,v&&r?y(t):(r=i=void 0,a)}function j(){var t=s(),n=b(t);if(r=arguments,i=this,f=t,n){if(void 0===c)return h(f);if(p)return clearTimeout(c),c=setTimeout(m,e),y(f)}return void 0===c&&(c=setTimeout(m,e)),a}return e=E(e)||0,o(n)&&(d=!!n.leading,u=(p=\"maxWait\"in n)?T(E(n.maxWait)||0,e):u,v=\"trailing\"in n?!!n.trailing:v),j.cancel=function(){void 0!==c&&clearTimeout(c),l=0,r=f=i=c=void 0},j.flush=function(){return void 0===c?a:g(s())},j};var k={name:\"ckeditor\",render(t){return t(this.tagName)},props:{editor:{type:Function,default:null},value:{type:String,default:\"\"},config:{type:Object,default:()=>({})},tagName:{type:String,default:\"div\"},disabled:{type:Boolean,default:!1}},data:()=>({$_instance:null,$_lastEditorData:{type:String,default:\"\"}}),mounted(){const t=Object.assign({},this.config);this.value&&(t.initialData=this.value),this.editor.create(this.$el,t).then(t=>{this.$_instance=t,t.isReadOnly=this.disabled,this.$_setUpEditorEvents(),this.$emit(\"ready\",t)}).catch(t=>{console.error(t)})},beforeDestroy(){this.$_instance&&(this.$_instance.destroy(),this.$_instance=null),this.$emit(\"destroy\",this.$_instance)},watch:{value(t,e){t!==e&&t!==this.$_lastEditorData&&this.$_instance.setData(t)},disabled(t){this.$_instance.isReadOnly=t}},methods:{$_setUpEditorEvents(){const t=this.$_instance,e=N(e=>{const n=this.$_lastEditorData=t.getData();this.$emit(\"input\",n,e,t)},300,{leading:!0});t.model.document.on(\"change:data\",e),t.editing.view.document.on(\"focus\",e=>{this.$emit(\"focus\",e,t)}),t.editing.view.document.on(\"blur\",e=>{this.$emit(\"blur\",e,t)})}}};const M=i.a?i.a.version:r.version,[P]=M.split(\".\").map(t=>parseInt(t,10));if(2!==P)throw new Error(\"The CKEditor plugin works only with Vue 2.x. For more information, please refer to https://ckeditor.com/docs/ckeditor5/latest/builds/guides/integration/frameworks/vuejs-v2.html\");const F={install(t){t.component(\"ckeditor\",k)},component:k};e.default=F}]).default}));\n//# sourceMappingURL=ckeditor.js.map","/**\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 * Set of utils to handle unicode characters.\n *\n * @module utils/unicode\n */\n\n/**\n * Checks whether given `character` is a combining mark.\n *\n * @param {String} character Character to check.\n * @returns {Boolean}\n */\nexport function isCombiningMark( character ) {\n\t// eslint-disable-next-line no-misleading-character-class\n\treturn !!character && character.length == 1 && /[\\u0300-\\u036f\\u1ab0-\\u1aff\\u1dc0-\\u1dff\\u20d0-\\u20ff\\ufe20-\\ufe2f]/.test( character );\n}\n\n/**\n * Checks whether given `character` is a high half of surrogate pair.\n *\n * Using UTF-16 terminology, a surrogate pair denotes UTF-16 character using two UTF-8 characters. The surrogate pair\n * consist of high surrogate pair character followed by low surrogate pair character.\n *\n * @param {String} character Character to check.\n * @returns {Boolean}\n */\nexport function isHighSurrogateHalf( character ) {\n\treturn !!character && character.length == 1 && /[\\ud800-\\udbff]/.test( character );\n}\n\n/**\n * Checks whether given `character` is a low half of surrogate pair.\n *\n * Using UTF-16 terminology, a surrogate pair denotes UTF-16 character using two UTF-8 characters. The surrogate pair\n * consist of high surrogate pair character followed by low surrogate pair character.\n *\n * @param {String} character Character to check.\n * @returns {Boolean}\n */\nexport function isLowSurrogateHalf( character ) {\n\treturn !!character && character.length == 1 && /[\\udc00-\\udfff]/.test( character );\n}\n\n/**\n * Checks whether given offset in a string is inside a surrogate pair (between two surrogate halves).\n *\n * @param {String} string String to check.\n * @param {Number} offset Offset to check.\n * @returns {Boolean}\n */\nexport function isInsideSurrogatePair( string, offset ) {\n\treturn isHighSurrogateHalf( string.charAt( offset - 1 ) ) && isLowSurrogateHalf( string.charAt( offset ) );\n}\n\n/**\n * Checks whether given offset in a string is between base character and combining mark or between two combining marks.\n *\n * @param {String} string String to check.\n * @param {Number} offset Offset to check.\n * @returns {Boolean}\n */\nexport function isInsideCombinedSymbol( string, offset ) {\n\treturn isCombiningMark( string.charAt( offset ) );\n}\n","/**\n * @license Copyright (c) 2003-2021, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/* global setTimeout, clearTimeout */\n\n/**\n * @module utils/focustracker\n */\n\nimport DomEmitterMixin from './dom/emittermixin';\nimport ObservableMixin from './observablemixin';\nimport CKEditorError from './ckeditorerror';\nimport mix from './mix';\n\n/**\n * Allows observing a group of `HTMLElement`s whether at least one of them is focused.\n *\n * Used by the {@link module:core/editor/editor~Editor} in order to track whether the focus is still within the application,\n * or were used outside of its UI.\n *\n * **Note** `focus` and `blur` listeners use event capturing, so it is only needed to register wrapper `HTMLElement`\n * which contain other `focusable` elements. But note that this wrapper element has to be focusable too\n * (have e.g. `tabindex=\"-1\"`).\n *\n * Check out the {@glink framework/guides/deep-dive/ui/focus-tracking \"Deep dive into focus tracking\" guide} to learn more.\n *\n * @mixes module:utils/dom/emittermixin~EmitterMixin\n * @mixes module:utils/observablemixin~ObservableMixin\n */\nexport default class FocusTracker {\n\tconstructor() {\n\t\t/**\n\t\t * True when one of the registered elements is focused.\n\t\t *\n\t\t * @readonly\n\t\t * @observable\n\t\t * @member {Boolean} #isFocused\n\t\t */\n\t\tthis.set( 'isFocused', false );\n\n\t\t/**\n\t\t * The currently focused element.\n\t\t *\n\t\t * While {@link #isFocused `isFocused`} remains `true`, the focus can\n\t\t * move between different UI elements. This property tracks those\n\t\t * elements and tells which one is currently focused.\n\t\t *\n\t\t * @readonly\n\t\t * @observable\n\t\t * @member {HTMLElement|null} #focusedElement\n\t\t */\n\t\tthis.set( 'focusedElement', null );\n\n\t\t/**\n\t\t * List of registered elements.\n\t\t *\n\t\t * @private\n\t\t * @member {Set.<HTMLElement>}\n\t\t */\n\t\tthis._elements = new Set();\n\n\t\t/**\n\t\t * Event loop timeout.\n\t\t *\n\t\t * @private\n\t\t * @member {Number}\n\t\t */\n\t\tthis._nextEventLoopTimeout = null;\n\t}\n\n\t/**\n\t * Starts tracking the specified element.\n\t *\n\t * @param {HTMLElement} element\n\t */\n\tadd( element ) {\n\t\tif ( this._elements.has( element ) ) {\n\t\t\t/**\n\t\t\t * This element is already tracked by {@link module:utils/focustracker~FocusTracker}.\n\t\t\t *\n\t\t\t * @error focustracker-add-element-already-exist\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'focustracker-add-element-already-exist', this );\n\t\t}\n\n\t\tthis.listenTo( element, 'focus', () => this._focus( element ), { useCapture: true } );\n\t\tthis.listenTo( element, 'blur', () => this._blur(), { useCapture: true } );\n\t\tthis._elements.add( element );\n\t}\n\n\t/**\n\t * Stops tracking the specified element and stops listening on this element.\n\t *\n\t * @param {HTMLElement} element\n\t */\n\tremove( element ) {\n\t\tif ( element === this.focusedElement ) {\n\t\t\tthis._blur( element );\n\t\t}\n\n\t\tif ( this._elements.has( element ) ) {\n\t\t\tthis.stopListening( element );\n\t\t\tthis._elements.delete( element );\n\t\t}\n\t}\n\n\t/**\n\t * Destroys the focus tracker by:\n\t * - Disabling all event listeners attached to tracked elements.\n\t * - Removing all tracked elements that were previously added.\n\t */\n\tdestroy() {\n\t\tthis.stopListening();\n\t}\n\n\t/**\n\t * Stores currently focused element and set {#isFocused} as `true`.\n\t *\n\t * @private\n\t * @param {HTMLElement} element Element which has been focused.\n\t */\n\t_focus( element ) {\n\t\tclearTimeout( this._nextEventLoopTimeout );\n\n\t\tthis.focusedElement = element;\n\t\tthis.isFocused = true;\n\t}\n\n\t/**\n\t * Clears currently focused element and set {@link #isFocused} as `false`.\n\t * This method uses `setTimeout` to change order of fires `blur` and `focus` events.\n\t *\n\t * @private\n\t * @fires blur\n\t */\n\t_blur() {\n\t\tclearTimeout( this._nextEventLoopTimeout );\n\n\t\tthis._nextEventLoopTimeout = setTimeout( () => {\n\t\t\tthis.focusedElement = null;\n\t\t\tthis.isFocused = false;\n\t\t}, 0 );\n\t}\n\n\t/**\n\t * @event focus\n\t */\n\n\t/**\n\t * @event blur\n\t */\n}\n\nmix( FocusTracker, DomEmitterMixin );\nmix( FocusTracker, ObservableMixin );\n","/**\n * @license Copyright (c) 2003-2021, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * A set of utilities related to keyboard support.\n *\n * @module utils/keyboard\n */\n\nimport CKEditorError from './ckeditorerror';\nimport env from './env';\n\nconst modifiersToGlyphsMac = {\n\tctrl: '⌃',\n\tcmd: '⌘',\n\talt: '⌥',\n\tshift: '⇧'\n};\n\nconst modifiersToGlyphsNonMac = {\n\tctrl: 'Ctrl+',\n\talt: 'Alt+',\n\tshift: 'Shift+'\n};\n\n/**\n * An object with `keyName => keyCode` pairs for a set of known keys.\n *\n * Contains:\n *\n * * `a-z`,\n * * `0-9`,\n * * `f1-f12`,\n * * `arrow(left|up|right|bottom)`,\n * * `backspace`, `delete`, `enter`, `esc`, `tab`,\n * * `ctrl`, `cmd`, `shift`, `alt`.\n */\nexport const keyCodes = generateKnownKeyCodes();\n\nconst keyCodeNames = Object.fromEntries(\n\tObject.entries( keyCodes ).map( ( [ name, code ] ) => [ code, name.charAt( 0 ).toUpperCase() + name.slice( 1 ) ] )\n);\n\n/**\n * Converts a key name or {@link module:utils/keyboard~KeystrokeInfo keystroke info} into a key code.\n *\n * Note: Key names are matched with {@link module:utils/keyboard~keyCodes} in a case-insensitive way.\n *\n * @param {String|module:utils/keyboard~KeystrokeInfo} A key name (see {@link module:utils/keyboard~keyCodes})\n * or a keystroke data object.\n * @returns {Number} Key or keystroke code.\n */\nexport function getCode( key ) {\n\tlet keyCode;\n\n\tif ( typeof key == 'string' ) {\n\t\tkeyCode = keyCodes[ key.toLowerCase() ];\n\n\t\tif ( !keyCode ) {\n\t\t\t/**\n\t\t\t * Unknown key name. Only key names included in the {@link module:utils/keyboard~keyCodes} can be used.\n\t\t\t *\n\t\t\t * @error keyboard-unknown-key\n\t\t\t * @param {String} key\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'keyboard-unknown-key', null, { key } );\n\t\t}\n\t} else {\n\t\tkeyCode = key.keyCode +\n\t\t\t( key.altKey ? keyCodes.alt : 0 ) +\n\t\t\t( key.ctrlKey ? keyCodes.ctrl : 0 ) +\n\t\t\t( key.shiftKey ? keyCodes.shift : 0 ) +\n\t\t\t( key.metaKey ? keyCodes.cmd : 0 );\n\t}\n\n\treturn keyCode;\n}\n\n/**\n * Parses the keystroke and returns a keystroke code that will match the code returned by\n * {@link module:utils/keyboard~getCode} for the corresponding {@link module:utils/keyboard~KeystrokeInfo keystroke info}.\n *\n * The keystroke can be passed in two formats:\n *\n * * as a single string – e.g. `ctrl + A`,\n * * as an array of {@link module:utils/keyboard~keyCodes known key names} and key codes – e.g.:\n *   * `[ 'ctrl', 32 ]` (ctrl + space),\n *   * `[ 'ctrl', 'a' ]` (ctrl + A).\n *\n * Note: Key names are matched with {@link module:utils/keyboard~keyCodes} in a case-insensitive way.\n *\n * Note: Only keystrokes with a single non-modifier key are supported (e.g. `ctrl+A` is OK, but `ctrl+A+B` is not).\n *\n * Note: On macOS, keystroke handling is translating the `Ctrl` key to the `Cmd` key and handling only that keystroke.\n * For example, a registered keystroke `Ctrl+A` will be translated to `Cmd+A` on macOS. To disable the translation of some keystroke,\n * use the forced modifier: `Ctrl!+A` (note the exclamation mark).\n *\n * @param {String|Array.<Number|String>} keystroke The keystroke definition.\n * @returns {Number} Keystroke code.\n */\nexport function parseKeystroke( keystroke ) {\n\tif ( typeof keystroke == 'string' ) {\n\t\tkeystroke = splitKeystrokeText( keystroke );\n\t}\n\n\treturn keystroke\n\t\t.map( key => ( typeof key == 'string' ) ? getEnvKeyCode( key ) : key )\n\t\t.reduce( ( key, sum ) => sum + key, 0 );\n}\n\n/**\n * Translates any keystroke string text like `\"Ctrl+A\"` to an\n * environment–specific keystroke, i.e. `\"⌘A\"` on macOS.\n *\n * @param {String} keystroke The keystroke text.\n * @returns {String} The keystroke text specific for the environment.\n */\nexport function getEnvKeystrokeText( keystroke ) {\n\tlet keystrokeCode = parseKeystroke( keystroke );\n\n\tconst modifiersToGlyphs = Object.entries( env.isMac ? modifiersToGlyphsMac : modifiersToGlyphsNonMac );\n\n\tconst modifiers = modifiersToGlyphs.reduce( ( modifiers, [ name, glyph ] ) => {\n\t\t// Modifier keys are stored as a bit mask so extract those from the keystroke code.\n\t\tif ( ( keystrokeCode & keyCodes[ name ] ) != 0 ) {\n\t\t\tkeystrokeCode &= ~keyCodes[ name ];\n\t\t\tmodifiers += glyph;\n\t\t}\n\n\t\treturn modifiers;\n\t}, '' );\n\n\treturn modifiers + ( keystrokeCode ? keyCodeNames[ keystrokeCode ] : '' );\n}\n\n/**\n * Returns `true` if the provided key code represents one of the arrow keys.\n *\n * @param {Number} keyCode A key code as in {@link module:utils/keyboard~KeystrokeInfo#keyCode}.\n * @returns {Boolean}\n */\nexport function isArrowKeyCode( keyCode ) {\n\treturn keyCode == keyCodes.arrowright ||\n\t\tkeyCode == keyCodes.arrowleft ||\n\t\tkeyCode == keyCodes.arrowup ||\n\t\tkeyCode == keyCodes.arrowdown;\n}\n\n/**\n * Returns the direction in which the {@link module:engine/model/documentselection~DocumentSelection selection}\n * will move when the provided arrow key code is pressed considering the language direction of the editor content.\n *\n * For instance, in right–to–left (RTL) content languages, pressing the left arrow means moving the selection right (forward)\n * in the model structure. Similarly, pressing the right arrow moves the selection left (backward).\n *\n * @param {Number} keyCode A key code as in {@link module:utils/keyboard~KeystrokeInfo#keyCode}.\n * @param {'ltr'|'rtl'} contentLanguageDirection The content language direction, corresponding to\n * {@link module:utils/locale~Locale#contentLanguageDirection}.\n * @returns {'left'|'up'|'right'|'down'} Localized arrow direction.\n */\nexport function getLocalizedArrowKeyCodeDirection( keyCode, contentLanguageDirection ) {\n\tconst isLtrContent = contentLanguageDirection === 'ltr';\n\n\tswitch ( keyCode ) {\n\t\tcase keyCodes.arrowleft:\n\t\t\treturn isLtrContent ? 'left' : 'right';\n\n\t\tcase keyCodes.arrowright:\n\t\t\treturn isLtrContent ? 'right' : 'left';\n\n\t\tcase keyCodes.arrowup:\n\t\t\treturn 'up';\n\n\t\tcase keyCodes.arrowdown:\n\t\t\treturn 'down';\n\t}\n}\n\n// Converts a key name to the key code with mapping based on the env.\n//\n// See: {@link module:utils/keyboard~getCode}.\n//\n// @param {String} key The key name (see {@link module:utils/keyboard~keyCodes}).\n// @returns {Number} Key code.\nfunction getEnvKeyCode( key ) {\n\t// Don't remap modifier key for forced modifiers.\n\tif ( key.endsWith( '!' ) ) {\n\t\treturn getCode( key.slice( 0, -1 ) );\n\t}\n\n\tconst code = getCode( key );\n\n\treturn env.isMac && code == keyCodes.ctrl ? keyCodes.cmd : code;\n}\n\n/**\n * Determines if the provided key code moves the {@link module:engine/model/documentselection~DocumentSelection selection}\n * forward or backward considering the language direction of the editor content.\n *\n * For instance, in right–to–left (RTL) languages, pressing the left arrow means moving forward\n * in the model structure. Similarly, pressing the right arrow moves the selection backward.\n *\n * @param {Number} keyCode A key code as in {@link module:utils/keyboard~KeystrokeInfo#keyCode}.\n * @param {'ltr'|'rtl'} contentLanguageDirection The content language direction, corresponding to\n * {@link module:utils/locale~Locale#contentLanguageDirection}.\n * @returns {Boolean}\n */\nexport function isForwardArrowKeyCode( keyCode, contentLanguageDirection ) {\n\tconst localizedKeyCodeDirection = getLocalizedArrowKeyCodeDirection( keyCode, contentLanguageDirection );\n\n\treturn localizedKeyCodeDirection === 'down' || localizedKeyCodeDirection === 'right';\n}\n\nfunction generateKnownKeyCodes() {\n\tconst keyCodes = {\n\t\tarrowleft: 37,\n\t\tarrowup: 38,\n\t\tarrowright: 39,\n\t\tarrowdown: 40,\n\t\tbackspace: 8,\n\t\tdelete: 46,\n\t\tenter: 13,\n\t\tspace: 32,\n\t\tesc: 27,\n\t\ttab: 9,\n\n\t\t// The idea about these numbers is that they do not collide with any real key codes, so we can use them\n\t\t// like bit masks.\n\t\tctrl: 0x110000,\n\t\tshift: 0x220000,\n\t\talt: 0x440000,\n\t\tcmd: 0x880000\n\t};\n\n\t// a-z\n\tfor ( let code = 65; code <= 90; code++ ) {\n\t\tconst letter = String.fromCharCode( code );\n\n\t\tkeyCodes[ letter.toLowerCase() ] = code;\n\t}\n\n\t// 0-9\n\tfor ( let code = 48; code <= 57; code++ ) {\n\t\tkeyCodes[ code - 48 ] = code;\n\t}\n\n\t// F1-F12\n\tfor ( let code = 112; code <= 123; code++ ) {\n\t\tkeyCodes[ 'f' + ( code - 111 ) ] = code;\n\t}\n\n\treturn keyCodes;\n}\n\nfunction splitKeystrokeText( keystroke ) {\n\treturn keystroke.split( /\\s*\\+\\s*/ );\n}\n\n/**\n * Information about the keystroke.\n *\n * @interface module:utils/keyboard~KeystrokeInfo\n */\n\n/**\n * The [key code](https://developer.mozilla.org/en-US/docs/Web/API/KeyboardEvent/keyCode).\n *\n * @member {Number} module:utils/keyboard~KeystrokeInfo#keyCode\n */\n\n/**\n * Whether the <kbd>Alt</kbd> modifier was pressed.\n *\n * @member {Boolean} module:utils/keyboard~KeystrokeInfo#altKey\n */\n\n/**\n * Whether the <kbd>Ctrl</kbd> modifier was pressed.\n *\n * @member {Boolean} module:utils/keyboard~KeystrokeInfo#ctrlKey\n */\n\n/**\n * Whether the <kbd>Shift</kbd> modifier was pressed.\n *\n * @member {Boolean} module:utils/keyboard~KeystrokeInfo#shiftKey\n */\n\n/**\n * Whether the <kbd>Cmd</kbd> modifier was pressed.\n *\n * @member {Boolean} module:utils/keyboard~KeystrokeInfo#metaKey\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/keystrokehandler\n */\n\nimport DomEmitterMixin from './dom/emittermixin';\nimport { getCode, parseKeystroke } from './keyboard';\n\n/**\n * Keystroke handler allows registering callbacks for given keystrokes.\n *\n * The most frequent use of this class is through the {@link module:core/editor/editor~Editor#keystrokes `editor.keystrokes`}\n * property. It allows listening to keystrokes executed in the editing view:\n *\n *\t\teditor.keystrokes.set( 'Ctrl+A', ( keyEvtData, cancel ) => {\n *\t\t\tconsole.log( 'Ctrl+A has been pressed' );\n *\t\t\tcancel();\n *\t\t} );\n *\n * However, this utility class can be used in various part of the UI. For instance, a certain {@link module:ui/view~View}\n * can use it like this:\n *\n *\t\tclass MyView extends View {\n *\t\t\tconstructor() {\n *\t\t\t\tthis.keystrokes = new KeystrokeHandler();\n *\n * \t\t\t\tthis.keystrokes.set( 'tab', handleTabKey );\n *\t\t\t}\n *\n *\t\t\trender() {\n *\t\t\t\tsuper.render();\n *\n *\t\t\t\tthis.keystrokes.listenTo( this.element );\n *\t\t\t}\n *\t\t}\n *\n * That keystroke handler will listen to `keydown` events fired in this view's main element.\n *\n */\nexport default class KeystrokeHandler {\n\t/**\n\t * Creates an instance of the keystroke handler.\n\t */\n\tconstructor() {\n\t\t/**\n\t\t * Listener used to listen to events for easier keystroke handler destruction.\n\t\t *\n\t\t * @protected\n\t\t * @member {module:utils/dom/emittermixin~Emitter}\n\t\t */\n\t\tthis._listener = Object.create( DomEmitterMixin );\n\t}\n\n\t/**\n\t * Starts listening for `keydown` events from a given emitter.\n\t *\n\t * @param {module:utils/emittermixin~Emitter} emitter\n\t */\n\tlistenTo( emitter ) {\n\t\t// The #_listener works here as a kind of dispatcher. It groups the events coming from the same\n\t\t// keystroke so the listeners can be attached to them with different priorities.\n\t\t//\n\t\t// E.g. all the keystrokes with the `keyCode` of 42 coming from the `emitter` are propagated\n\t\t// as a `_keydown:42` event by the `_listener`. If there's a callback created by the `set`\n\t\t// method for this 42 keystroke, it listens to the `_listener#_keydown:42` event only and interacts\n\t\t// only with other listeners of this particular event, thus making it possible to prioritize\n\t\t// the listeners and safely cancel execution, when needed. Instead of duplicating the Emitter logic,\n\t\t// the KeystrokeHandler re–uses it to do its job.\n\t\tthis._listener.listenTo( emitter, 'keydown', ( evt, keyEvtData ) => {\n\t\t\tthis._listener.fire( '_keydown:' + getCode( keyEvtData ), keyEvtData );\n\t\t} );\n\t}\n\n\t/**\n\t * Registers a handler for the specified keystroke.\n\t *\n\t * @param {String|Array.<String|Number>} keystroke Keystroke defined in a format accepted by\n\t * the {@link module:utils/keyboard~parseKeystroke} function.\n\t * @param {Function} callback A function called with the\n\t * {@link module:engine/view/observer/keyobserver~KeyEventData key event data} object and\n\t * a helper funcion to call both `preventDefault()` and `stopPropagation()` on the underlying event.\n\t * @param {Object} [options={}] Additional options.\n\t * @param {module:utils/priorities~PriorityString|Number} [options.priority='normal'] The priority of the keystroke\n\t * callback. The higher the priority value the sooner the callback will be executed. Keystrokes having the same priority\n\t * are called in the order they were added.\n\t */\n\tset( keystroke, callback, options = {} ) {\n\t\tconst keyCode = parseKeystroke( keystroke );\n\t\tconst priority = options.priority;\n\n\t\t// Execute the passed callback on KeystrokeHandler#_keydown.\n\t\t// TODO: https://github.com/ckeditor/ckeditor5-utils/issues/144\n\t\tthis._listener.listenTo( this._listener, '_keydown:' + keyCode, ( evt, keyEvtData ) => {\n\t\t\tcallback( keyEvtData, () => {\n\t\t\t\t// Stop the event in the DOM: no listener in the web page\n\t\t\t\t// will be triggered by this event.\n\t\t\t\tkeyEvtData.preventDefault();\n\t\t\t\tkeyEvtData.stopPropagation();\n\n\t\t\t\t// Stop the event in the KeystrokeHandler: no more callbacks\n\t\t\t\t// will be executed for this keystroke.\n\t\t\t\tevt.stop();\n\t\t\t} );\n\n\t\t\t// Mark this keystroke as handled by the callback. See: #press.\n\t\t\tevt.return = true;\n\t\t}, { priority } );\n\t}\n\n\t/**\n\t * Triggers a keystroke handler for a specified key combination, if such a keystroke was {@link #set defined}.\n\t *\n\t * @param {module:engine/view/observer/keyobserver~KeyEventData} keyEvtData Key event data.\n\t * @returns {Boolean} Whether the keystroke was handled.\n\t */\n\tpress( keyEvtData ) {\n\t\treturn !!this._listener.fire( '_keydown:' + getCode( keyEvtData ), keyEvtData );\n\t}\n\n\t/**\n\t * Destroys the keystroke handler.\n\t */\n\tdestroy() {\n\t\tthis._listener.stopListening();\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2021, 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 */\n\n/**\n * @module utils/translation-service\n */\n\nimport CKEditorError from './ckeditorerror';\n\n/* istanbul ignore else */\nif ( !window.CKEDITOR_TRANSLATIONS ) {\n\twindow.CKEDITOR_TRANSLATIONS = {};\n}\n\n/**\n * Adds translations to existing ones or overrides the existing translations. These translations will later\n * be available for the {@link module:utils/locale~Locale#t `t()`} function.\n *\n * The `translations` is an object which consists of `messageId: translation` pairs. Note that the message ID can be\n * either constructed from the message string or from the message ID if it was passed\n * (this happens rarely and mostly for short messages or messages with placeholders).\n * Since the editor displays only the message string, the message ID can be found either in the source code or in the\n * built translations for another language.\n *\n *\t\tadd( 'pl', {\n *\t\t\t'Cancel': 'Anuluj',\n *\t\t\t'IMAGE': 'obraz', // Note that the `IMAGE` comes from the message ID, while the string can be `image`.\n *\t\t} );\n *\n * If the message is supposed to support various plural forms, make sure to provide an array with the singular form and all plural forms:\n *\n *\t\tadd( 'pl', {\n *\t \t\t'Add space': [ 'Dodaj spację', 'Dodaj %0 spacje', 'Dodaj %0 spacji' ]\n * \t\t} );\n *\n * You should also specify the third argument (the `getPluralForm()` function) that will be used to determine the plural form if no\n * language file was loaded for that language. All language files coming from CKEditor 5 sources will have this option set, so\n * these plural form rules will be reused by other translations added to the registered languages. The `getPluralForm()` function\n * can return either a Boolean or a number.\n *\n * \t\tadd( 'en', {\n *\t \t\t// ... Translations.\n * \t\t}, n => n !== 1 );\n * \t\tadd( 'pl', {\n *\t \t\t// ... Translations.\n * \t\t}, n => n == 1 ? 0 : n % 10 >= 2 && n % 10 <= 4 && ( n % 100 < 10 || n % 100 >= 20 ) ? 1 : 2 );\n *\n * All translations extend the global `window.CKEDITOR_TRANSLATIONS` object. An example of this object can be found below:\n *\n * \t\t{\n * \t\t\tpl: {\n *\t\t\t\tdictionary: {\n *\t\t\t\t\t'Cancel': 'Anuluj',\n *\t\t\t\t\t'Add space': [ 'Dodaj spację', 'Dodaj %0 spacje', 'Dodaj %0 spacji' ]\n *\t\t\t\t},\n *\t\t\t\t// A function that returns the plural form index.\n *\t\t\t\tgetPluralForm: n => n !==1\n *\t\t\t}\n *\t\t\t// Other languages.\n *\t\t}\n *\n * If you cannot import this function from this module (e.g. because you use a CKEditor 5 build), you can\n * still add translations by extending the global `window.CKEDITOR_TRANSLATIONS` object by using a function like\n * the one below:\n *\n *\t\tfunction addTranslations( language, translations, getPluralForm ) {\n *\t\t\tif ( !window.CKEDITOR_TRANSLATIONS ) {\n *\t\t\t\twindow.CKEDITOR_TRANSLATIONS = {};\n *\t\t\t}\n\n *\t\t\tif ( !window.CKEDITOR_TRANSLATIONS[ language ] ) {\n *\t\t\t\twindow.CKEDITOR_TRANSLATIONS[ language ] = {};\n *\t\t\t}\n *\n *\t\t\tconst languageTranslations = window.CKEDITOR_TRANSLATIONS[ language ];\n *\n * \t\t\tlanguageTranslations.dictionary = languageTranslations.dictionary || {};\n * \t\t\tlanguageTranslations.getPluralForm = getPluralForm || languageTranslations.getPluralForm;\n *\n *\t\t\t// Extend the dictionary for the given language.\n *\t\t\tObject.assign( languageTranslations.dictionary, translations );\n *\t\t}\n *\n * @param {String} language Target language.\n * @param {Object.<String,*>} translations An object with translations which will be added to the dictionary.\n * For each message ID the value should be either a translation or an array of translations if the message\n * should support plural forms.\n * @param {Function} getPluralForm A function that returns the plural form index (a number).\n */\nexport function add( language, translations, getPluralForm ) {\n\tif ( !window.CKEDITOR_TRANSLATIONS[ language ] ) {\n\t\twindow.CKEDITOR_TRANSLATIONS[ language ] = {};\n\t}\n\n\tconst languageTranslations = window.CKEDITOR_TRANSLATIONS[ language ];\n\n\tlanguageTranslations.dictionary = languageTranslations.dictionary || {};\n\tlanguageTranslations.getPluralForm = getPluralForm || languageTranslations.getPluralForm;\n\n\tObject.assign( languageTranslations.dictionary, translations );\n}\n\n/**\n * **Note:** This method is internal, use {@link module:utils/locale~Locale#t the `t()` function} instead to translate\n * the editor UI parts.\n *\n * This function is responsible for translating messages to the specified language. It uses translations added perviously\n * by {@link module:utils/translation-service~add} (a translations dictionary and the `getPluralForm()` function\n * to provide accurate translations of plural forms).\n *\n * When no translation is defined in the dictionary or the dictionary does not exist, this function returns\n * the original message string or the message plural depending on the number of elements.\n *\n *\t\ttranslate( 'pl', { string: 'Cancel' } ); // 'Cancel'\n *\n * The third optional argument is the number of elements, based on which the single form or one of the plural forms\n * should be picked when the message is supposed to support various plural forms.\n *\n * \t\ttranslate( 'en', { string: 'Add a space', plural: 'Add %0 spaces' }, 1 ); // 'Add a space'\n * \t\ttranslate( 'en', { string: 'Add a space', plural: 'Add %0 spaces' }, 3 ); // 'Add %0 spaces'\n *\n * The message should provide an ID using the `id` property when the message strings are not unique and their\n * translations should be different.\n *\n *\t\ttranslate( 'en', { string: 'image', id: 'ADD_IMAGE' } );\n *\t\ttranslate( 'en', { string: 'image', id: 'AN_IMAGE' } );\n *\n * @protected\n * @param {String} language Target language.\n * @param {module:utils/translation-service~Message|String} message A message that will be translated.\n * @param {Number} [quantity] The number of elements for which a plural form should be picked from the target language dictionary.\n * @returns {String} Translated sentence.\n */\nexport function _translate( language, message, quantity = 1 ) {\n\tif ( typeof quantity !== 'number' ) {\n\t\t/**\n\t\t * An incorrect value was passed to the translation function. This was probably caused\n\t\t * by an incorrect message interpolation of a plural form. Note that for messages supporting plural forms\n\t\t * the second argument of the `t()` function should always be a number or an array with a number as the first element.\n\t\t *\n\t\t * @error translation-service-quantity-not-a-number\n\t\t */\n\t\tthrow new CKEditorError( 'translation-service-quantity-not-a-number', null, { quantity } );\n\t}\n\n\tconst numberOfLanguages = getNumberOfLanguages();\n\n\tif ( numberOfLanguages === 1 ) {\n\t\t// Override the language to the only supported one.\n\t\t// This can't be done in the `Locale` class, because the translations comes after the `Locale` class initialization.\n\t\tlanguage = Object.keys( window.CKEDITOR_TRANSLATIONS )[ 0 ];\n\t}\n\n\tconst messageId = message.id || message.string;\n\n\tif ( numberOfLanguages === 0 || !hasTranslation( language, messageId ) ) {\n\t\tif ( quantity !== 1 ) {\n\t\t\t// Return the default plural form that was passed in the `message.plural` parameter.\n\t\t\treturn message.plural;\n\t\t}\n\n\t\treturn message.string;\n\t}\n\n\tconst dictionary = window.CKEDITOR_TRANSLATIONS[ language ].dictionary;\n\tconst getPluralForm = window.CKEDITOR_TRANSLATIONS[ language ].getPluralForm || ( n => n === 1 ? 0 : 1 );\n\n\tif ( typeof dictionary[ messageId ] === 'string' ) {\n\t\treturn dictionary[ messageId ];\n\t}\n\n\tconst pluralFormIndex = Number( getPluralForm( quantity ) );\n\n\t// Note: The `translate` function is not responsible for replacing `%0, %1, ...` with values.\n\treturn dictionary[ messageId ][ pluralFormIndex ];\n}\n\n/**\n * Clears dictionaries for test purposes.\n *\n * @protected\n */\nexport function _clear() {\n\twindow.CKEDITOR_TRANSLATIONS = {};\n}\n\n// Checks whether the dictionary exists and translation in that dictionary exists.\nfunction hasTranslation( language, messageId ) {\n\treturn (\n\t\t!!window.CKEDITOR_TRANSLATIONS[ language ] &&\n\t\t!!window.CKEDITOR_TRANSLATIONS[ language ].dictionary[ messageId ]\n\t);\n}\n\nfunction getNumberOfLanguages() {\n\treturn Object.keys( window.CKEDITOR_TRANSLATIONS ).length;\n}\n\n/**\n * The internationalization message interface. A message that implements this interface can be passed to the `t()` function\n * to be translated to the target UI language.\n *\n * @typedef {Object} module:utils/translation-service~Message\n *\n * @property {String} string The message string to translate. Acts as a default translation if the translation for a given language\n * is not defined. When the message is supposed to support plural forms, the string should be the English singular form of the message.\n * @property {String} [id] The message ID. If passed, the message ID is taken from this property instead of the `message.string`.\n * This property is useful when various messages share the same message string, for example, the `editor` string in `in the editor`\n * and `my editor` sentences.\n * @property {String} [plural] The plural form of the message. This property should be skipped when a message is not supposed\n * to support plural forms. Otherwise it should always be set to a string with the English plural form of the message.\n */\n","/**\n * @license Copyright (c) 2003-2021, 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/locale\n */\n\n/* globals console */\n\nimport toArray from './toarray';\nimport { _translate } from './translation-service';\n\nconst RTL_LANGUAGE_CODES = [ 'ar', 'fa', 'he', 'ku', 'ug' ];\n\n/**\n * Represents the localization services.\n */\nexport default class Locale {\n\t/**\n\t * Creates a new instance of the locale class. Learn more about\n\t * {@glink features/ui-language configuring the language of the editor}.\n\t *\n\t * @param {Object} [options] Locale configuration.\n\t * @param {String} [options.uiLanguage='en'] The editor UI language code in the\n\t * [ISO 639-1](https://en.wikipedia.org/wiki/ISO_639-1) format. See {@link #uiLanguage}.\n\t * @param {String} [options.contentLanguage] The editor content language code in the\n\t * [ISO 639-1](https://en.wikipedia.org/wiki/ISO_639-1) format. If not specified, the same as `options.language`.\n\t * See {@link #contentLanguage}.\n\t */\n\tconstructor( options = {} ) {\n\t\t/**\n\t\t * The editor UI language code in the [ISO 639-1](https://en.wikipedia.org/wiki/ISO_639-1) format.\n\t\t *\n\t\t * If the {@link #contentLanguage content language} was not specified in the `Locale` constructor,\n\t\t * it also defines the language of the content.\n\t\t *\n\t\t * @readonly\n\t\t * @member {String}\n\t\t */\n\t\tthis.uiLanguage = options.uiLanguage || 'en';\n\n\t\t/**\n\t\t * The editor content language code in the [ISO 639-1](https://en.wikipedia.org/wiki/ISO_639-1) format.\n\t\t *\n\t\t * Usually the same as the {@link #uiLanguage editor language}, it can be customized by passing an optional\n\t\t * argument to the `Locale` constructor.\n\t\t *\n\t\t * @readonly\n\t\t * @member {String}\n\t\t */\n\t\tthis.contentLanguage = options.contentLanguage || this.uiLanguage;\n\n\t\t/**\n\t\t * Text direction of the {@link #uiLanguage editor UI language}. Either `'ltr'` or `'rtl'`.\n\t\t *\n\t\t * @readonly\n\t\t * @member {String}\n\t\t */\n\t\tthis.uiLanguageDirection = getLanguageDirection( this.uiLanguage );\n\n\t\t/**\n\t\t * Text direction of the {@link #contentLanguage editor content language}.\n\t\t *\n\t\t * If the content language was passed directly to the `Locale` constructor, this property represents the\n\t\t * direction of that language.\n\t\t *\n\t\t * If the {@link #contentLanguage editor content language} was derived from the {@link #uiLanguage editor language},\n\t\t * the content language direction is the same as the {@link #uiLanguageDirection UI language direction}.\n\t\t *\n\t\t * The value is either `'ltr'` or `'rtl'`.\n\t\t *\n\t\t * @readonly\n\t\t * @member {String}\n\t\t */\n\t\tthis.contentLanguageDirection = getLanguageDirection( this.contentLanguage );\n\n\t\t/**\n\t\t * Translates the given message to the {@link #uiLanguage}. This method is also available in\n\t\t * {@link module:core/editor/editor~Editor#t `Editor`} and {@link module:ui/view~View#t `View`}.\n\t\t *\n\t\t * This method's context is statically bound to the `Locale` instance and **should always be called as a function**:\n\t\t *\n\t\t *\t\tconst t = locale.t;\n\t\t *\t\tt( 'Label' );\n\t\t *\n\t\t * The message can be either a string or an object implementing the {@link module:utils/translation-service~Message} interface.\n\t\t *\n\t\t * The message may contain placeholders (`%<index>`) for value(s) that are passed as a `values` parameter.\n\t\t * For an array of values, the `%<index>` will be changed to an element of that array at the given index.\n\t\t * For a single value passed as the second argument, only the `%0` placeholders will be changed to the provided value.\n\t\t *\n\t\t *\t\tt( 'Created file \"%0\" in %1ms.', [ fileName, timeTaken ] );\n\t\t * \t\tt( 'Created file \"%0\", fileName );\n\t\t *\n\t\t * The message supports plural forms. To specify the plural form, use the `plural` property. Singular or plural form\n\t\t * will be chosen depending on the first value from the passed `values`. The value of the `plural` property is used\n\t\t * as a default plural translation when the translation for the target language is missing.\n\t\t *\n\t\t *\t\tt( { string: 'Add a space', plural: 'Add %0 spaces' }, 1 ); // 'Add a space' for the English language.\n\t\t *\t\tt( { string: 'Add a space', plural: 'Add %0 spaces' }, 5 ); // 'Add 5 spaces' for the English language.\n\t\t *\t\tt( { string: '%1 a space', plural: '%1 %0 spaces' }, [ 2, 'Add' ] ); // 'Add 2 spaces' for the English language.\n\t\t *\n\t\t * \t\tt( { string: 'Add a space', plural: 'Add %0 spaces' }, 1 ); // 'Dodaj spację' for the Polish language.\n\t\t *\t\tt( { string: 'Add a space', plural: 'Add %0 spaces' }, 5 ); // 'Dodaj 5 spacji' for the Polish language.\n\t\t *\t\tt( { string: '%1 a space', plural: '%1 %0 spaces' }, [ 2, 'Add' ] ); // 'Dodaj 2 spacje' for the Polish language.\n\t\t *\n\t\t *  * The message should provide an ID using the `id` property when the message strings are not unique and their\n\t\t * translations should be different.\n\t\t *\n\t\t *\t\ttranslate( 'en', { string: 'image', id: 'ADD_IMAGE' } );\n\t\t *\t\ttranslate( 'en', { string: 'image', id: 'AN_IMAGE' } );\n\t\t *\n\t\t * @method #t\n\t\t * @param {String|module:utils/translation-service~Message} message A message that will be localized (translated).\n\t\t * @param {String|Number|Array.<String|Number>} [values] A value or an array of values that will fill message placeholders.\n\t\t * For messages supporting plural forms the first value will determine the plural form.\n\t\t * @returns {String}\n\t\t */\n\t\tthis.t = ( message, values ) => this._t( message, values );\n\t}\n\n\t/**\n\t * The editor UI language code in the [ISO 639-1](https://en.wikipedia.org/wiki/ISO_639-1) format.\n\t *\n\t * **Note**: This property was deprecated. Please use {@link #uiLanguage} and {@link #contentLanguage}\n\t * properties instead.\n\t *\n\t * @deprecated\n\t * @member {String}\n\t */\n\tget language() {\n\t\t/**\n\t\t * The {@link module:utils/locale~Locale#language `Locale#language`} property was deprecated and will\n\t\t * be removed in the near future. Please use the {@link #uiLanguage} and {@link #contentLanguage} properties instead.\n\t\t *\n\t\t * @error locale-deprecated-language-property\n\t\t */\n\t\tconsole.warn(\n\t\t\t'locale-deprecated-language-property: ' +\n\t\t\t'The Locale#language property has been deprecated and will be removed in the near future. ' +\n\t\t\t'Please use #uiLanguage and #contentLanguage properties instead.' );\n\n\t\treturn this.uiLanguage;\n\t}\n\n\t/**\n\t * An unbound version of the {@link #t} method.\n\t *\n\t * @private\n\t * @param {String|module:utils/translation-service~Message} message\n\t * @param {Number|String|Array.<Number|String>} [values]\n\t * @returns {String}\n\t */\n\t_t( message, values = [] ) {\n\t\tvalues = toArray( values );\n\n\t\tif ( typeof message === 'string' ) {\n\t\t\tmessage = { string: message };\n\t\t}\n\n\t\tconst hasPluralForm = !!message.plural;\n\t\tconst quantity = hasPluralForm ? values[ 0 ] : 1;\n\n\t\tconst translatedString = _translate( this.uiLanguage, message, quantity );\n\n\t\treturn interpolateString( translatedString, values );\n\t}\n}\n\n// Fills the `%0, %1, ...` string placeholders with values.\nfunction interpolateString( string, values ) {\n\treturn string.replace( /%(\\d+)/g, ( match, index ) => {\n\t\treturn ( index < values.length ) ? values[ index ] : match;\n\t} );\n}\n\n// Helps determine whether a language is LTR or RTL.\n//\n// @param {String} language The ISO 639-1 language code.\n// @returns {String} 'ltr' or 'rtl\nfunction getLanguageDirection( languageCode ) {\n\treturn RTL_LANGUAGE_CODES.includes( languageCode ) ? 'rtl' : 'ltr';\n}\n","/**\n * @license Copyright (c) 2003-2021, 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/objecttomap\n */\n\n/**\n * Transforms object to map.\n *\n *\t\tconst map = objectToMap( { 'foo': 1, 'bar': 2 } );\n *\t\tmap.get( 'foo' ); // 1\n *\n * **Note**: For mixed data (`Object` or `Iterable`) there's a dedicated {@link module:utils/tomap~toMap} function.\n *\n * @param {Object} obj Object to transform.\n * @returns {Map} Map created from object.\n */\nexport default function objectToMap( obj ) {\n\tconst map = new Map();\n\n\tfor ( const key in obj ) {\n\t\tmap.set( key, obj[ key ] );\n\t}\n\n\treturn map;\n}\n","/**\n * @license Copyright (c) 2003-2021, 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/tomap\n */\n\nimport objectToMap from './objecttomap';\nimport isIterable from './isiterable';\n\n/**\n * Transforms object or iterable to map. Iterable needs to be in the format acceptable by the `Map` constructor.\n *\n *\t\tmap = toMap( { 'foo': 1, 'bar': 2 } );\n *\t\tmap = toMap( [ [ 'foo', 1 ], [ 'bar', 2 ] ] );\n *\t\tmap = toMap( anotherMap );\n *\n * @param {Object|Iterable} data Object or iterable to transform.\n * @returns {Map} Map created from data.\n */\nexport default function toMap( data ) {\n\tif ( isIterable( data ) ) {\n\t\treturn new Map( data );\n\t} else {\n\t\treturn objectToMap( data );\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2021, 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\n */\n\nexport { default as env } from './env';\nexport { default as diff } from './diff';\n\nexport { default as mix } from './mix';\nexport { default as EmitterMixin } from './emittermixin';\nexport { default as ObservableMixin } from './observablemixin';\n\nexport { default as CKEditorError, logError, logWarning } from './ckeditorerror';\n\nexport { default as ElementReplacer } from './elementreplacer';\n\nexport { default as createElement } from './dom/createelement';\nexport { default as DomEmitterMixin } from './dom/emittermixin';\nexport { default as global } from './dom/global';\nexport { default as getDataFromElement } from './dom/getdatafromelement';\nexport { default as Rect } from './dom/rect';\nexport { default as ResizeObserver } from './dom/resizeobserver';\nexport { default as setDataInElement } from './dom/setdatainelement';\nexport { default as toUnit } from './dom/tounit';\n\nexport * from './keyboard';\nexport { default as Locale } from './locale';\nexport { default as Collection } from './collection';\nexport { default as first } from './first';\nexport { default as FocusTracker } from './focustracker';\nexport { default as KeystrokeHandler } from './keystrokehandler';\nexport { default as toArray } from './toarray';\nexport { default as toMap } from './tomap';\nexport { default as priorities } from './priorities';\n\nexport { default as uid } from './uid';\n\nexport { default as version } from './version';\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/spy\n */\n\n/**\n * Creates a spy function (ala Sinon.js) that can be used to inspect call to it.\n *\n * The following are the present features:\n *\n * * spy.called: property set to `true` if the function has been called at least once.\n *\n * @returns {Function} The spy function.\n */\nfunction spy() {\n\treturn function spy() {\n\t\tspy.called = true;\n\t};\n}\n\nexport default spy;\n","/**\n * @license Copyright (c) 2003-2021, 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/eventinfo\n */\n\nimport spy from './spy';\n\n/**\n * The event object passed to event callbacks. It is used to provide information about the event as well as a tool to\n * manipulate it.\n */\nexport default class EventInfo {\n\t/**\n\t * @param {Object} source The emitter.\n\t * @param {String} name The event name.\n\t */\n\tconstructor( source, name ) {\n\t\t/**\n\t\t * The object that fired the event.\n\t\t *\n\t\t * @readonly\n\t\t * @member {Object}\n\t\t */\n\t\tthis.source = source;\n\n\t\t/**\n\t\t * The event name.\n\t\t *\n\t\t * @readonly\n\t\t * @member {String}\n\t\t */\n\t\tthis.name = name;\n\n\t\t/**\n\t\t * Path this event has followed. See {@link module:utils/emittermixin~EmitterMixin#delegate}.\n\t\t *\n\t\t * @readonly\n\t\t * @member {Array.<Object>}\n\t\t */\n\t\tthis.path = [];\n\n\t\t// The following methods are defined in the constructor because they must be re-created per instance.\n\n\t\t/**\n\t\t * Stops the event emitter to call further callbacks for this event interaction.\n\t\t *\n\t\t * @method #stop\n\t\t */\n\t\tthis.stop = spy();\n\n\t\t/**\n\t\t * Removes the current callback from future interactions of this event.\n\t\t *\n\t\t * @method #off\n\t\t */\n\t\tthis.off = spy();\n\n\t\t/**\n\t\t * The value which will be returned by {@link module:utils/emittermixin~EmitterMixin#fire}.\n\t\t *\n\t\t * It's `undefined` by default and can be changed by an event listener:\n\t\t *\n\t\t *\t\tdataController.fire( 'getSelectedContent', ( evt ) => {\n\t\t *\t\t\t// This listener will make `dataController.fire( 'getSelectedContent' )`\n\t\t *\t\t\t// always return an empty DocumentFragment.\n\t\t *\t\t\tevt.return = new DocumentFragment();\n\t\t *\n\t\t *\t\t\t// Make sure no other listeners are executed.\n\t\t *\t\t\tevt.stop();\n\t\t *\t\t} );\n\t\t *\n\t\t * @member #return\n\t\t */\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2021, 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/observablemixin\n */\n\nimport EmitterMixin from './emittermixin';\nimport CKEditorError from './ckeditorerror';\nimport { extend, isObject } from 'lodash-es';\n\nconst observablePropertiesSymbol = Symbol( 'observableProperties' );\nconst boundObservablesSymbol = Symbol( 'boundObservables' );\nconst boundPropertiesSymbol = Symbol( 'boundProperties' );\n\n/**\n * A mixin that injects the \"observable properties\" and data binding functionality described in the\n * {@link ~Observable} interface.\n *\n * Read more about the concept of observables in the:\n * * {@glink framework/guides/architecture/core-editor-architecture#event-system-and-observables \"Event system and observables\"}\n * section of the {@glink framework/guides/architecture/core-editor-architecture \"Core editor architecture\"} guide,\n * * {@glink framework/guides/deep-dive/observables \"Observables\" deep dive} guide.\n *\n * @mixin ObservableMixin\n * @mixes module:utils/emittermixin~EmitterMixin\n * @implements module:utils/observablemixin~Observable\n */\nconst ObservableMixin = {\n\t/**\n\t * @inheritDoc\n\t */\n\tset( name, value ) {\n\t\t// If the first parameter is an Object, iterate over its properties.\n\t\tif ( isObject( name ) ) {\n\t\t\tObject.keys( name ).forEach( property => {\n\t\t\t\tthis.set( property, name[ property ] );\n\t\t\t}, this );\n\n\t\t\treturn;\n\t\t}\n\n\t\tinitObservable( this );\n\n\t\tconst properties = this[ observablePropertiesSymbol ];\n\n\t\tif ( ( name in this ) && !properties.has( name ) ) {\n\t\t\t/**\n\t\t\t * Cannot override an existing property.\n\t\t\t *\n\t\t\t * This error is thrown when trying to {@link ~Observable#set set} a property with\n\t\t\t * a name of an already existing property. For example:\n\t\t\t *\n\t\t\t *\t\tlet observable = new Model();\n\t\t\t *\t\tobservable.property = 1;\n\t\t\t *\t\tobservable.set( 'property', 2 );\t\t\t// throws\n\t\t\t *\n\t\t\t *\t\tobservable.set( 'property', 1 );\n\t\t\t *\t\tobservable.set( 'property', 2 );\t\t\t// ok, because this is an existing property.\n\t\t\t *\n\t\t\t * @error observable-set-cannot-override\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'observable-set-cannot-override', this );\n\t\t}\n\n\t\tObject.defineProperty( this, name, {\n\t\t\tenumerable: true,\n\t\t\tconfigurable: true,\n\n\t\t\tget() {\n\t\t\t\treturn properties.get( name );\n\t\t\t},\n\n\t\t\tset( value ) {\n\t\t\t\tconst oldValue = properties.get( name );\n\n\t\t\t\t// Fire `set` event before the new value will be set to make it possible\n\t\t\t\t// to override observable property without affecting `change` event.\n\t\t\t\t// See https://github.com/ckeditor/ckeditor5-utils/issues/171.\n\t\t\t\tlet newValue = this.fire( 'set:' + name, name, value, oldValue );\n\n\t\t\t\tif ( newValue === undefined ) {\n\t\t\t\t\tnewValue = value;\n\t\t\t\t}\n\n\t\t\t\t// Allow undefined as an initial value like A.define( 'x', undefined ) (#132).\n\t\t\t\t// Note: When properties map has no such own property, then its value is undefined.\n\t\t\t\tif ( oldValue !== newValue || !properties.has( name ) ) {\n\t\t\t\t\tproperties.set( name, newValue );\n\t\t\t\t\tthis.fire( 'change:' + name, name, newValue, oldValue );\n\t\t\t\t}\n\t\t\t}\n\t\t} );\n\n\t\tthis[ name ] = value;\n\t},\n\n\t/**\n\t * @inheritDoc\n\t */\n\tbind( ...bindProperties ) {\n\t\tif ( !bindProperties.length || !isStringArray( bindProperties ) ) {\n\t\t\t/**\n\t\t\t * All properties must be strings.\n\t\t\t *\n\t\t\t * @error observable-bind-wrong-properties\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'observable-bind-wrong-properties', this );\n\t\t}\n\n\t\tif ( ( new Set( bindProperties ) ).size !== bindProperties.length ) {\n\t\t\t/**\n\t\t\t * Properties must be unique.\n\t\t\t *\n\t\t\t * @error observable-bind-duplicate-properties\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'observable-bind-duplicate-properties', this );\n\t\t}\n\n\t\tinitObservable( this );\n\n\t\tconst boundProperties = this[ boundPropertiesSymbol ];\n\n\t\tbindProperties.forEach( propertyName => {\n\t\t\tif ( boundProperties.has( propertyName ) ) {\n\t\t\t\t/**\n\t\t\t\t * Cannot bind the same property more than once.\n\t\t\t\t *\n\t\t\t\t * @error observable-bind-rebind\n\t\t\t\t */\n\t\t\t\tthrow new CKEditorError( 'observable-bind-rebind', this );\n\t\t\t}\n\t\t} );\n\n\t\tconst bindings = new Map();\n\n\t\t// @typedef {Object} Binding\n\t\t// @property {Array} property Property which is bound.\n\t\t// @property {Array} to Array of observable–property components of the binding (`{ observable: ..., property: .. }`).\n\t\t// @property {Array} callback A function which processes `to` components.\n\t\tbindProperties.forEach( a => {\n\t\t\tconst binding = { property: a, to: [] };\n\n\t\t\tboundProperties.set( a, binding );\n\t\t\tbindings.set( a, binding );\n\t\t} );\n\n\t\t// @typedef {Object} BindChain\n\t\t// @property {Function} to See {@link ~ObservableMixin#_bindTo}.\n\t\t// @property {Function} toMany See {@link ~ObservableMixin#_bindToMany}.\n\t\t// @property {module:utils/observablemixin~Observable} _observable The observable which initializes the binding.\n\t\t// @property {Array} _bindProperties Array of `_observable` properties to be bound.\n\t\t// @property {Array} _to Array of `to()` observable–properties (`{ observable: toObservable, properties: ...toProperties }`).\n\t\t// @property {Map} _bindings Stores bindings to be kept in\n\t\t// {@link ~ObservableMixin#_boundProperties}/{@link ~ObservableMixin#_boundObservables}\n\t\t// initiated in this binding chain.\n\t\treturn {\n\t\t\tto: bindTo,\n\t\t\ttoMany: bindToMany,\n\n\t\t\t_observable: this,\n\t\t\t_bindProperties: bindProperties,\n\t\t\t_to: [],\n\t\t\t_bindings: bindings\n\t\t};\n\t},\n\n\t/**\n\t * @inheritDoc\n\t */\n\tunbind( ...unbindProperties ) {\n\t\t// Nothing to do here if not inited yet.\n\t\tif ( !( this[ observablePropertiesSymbol ] ) ) {\n\t\t\treturn;\n\t\t}\n\n\t\tconst boundProperties = this[ boundPropertiesSymbol ];\n\t\tconst boundObservables = this[ boundObservablesSymbol ];\n\n\t\tif ( unbindProperties.length ) {\n\t\t\tif ( !isStringArray( unbindProperties ) ) {\n\t\t\t\t/**\n\t\t\t\t * Properties must be strings.\n\t\t\t\t *\n\t\t\t\t * @error observable-unbind-wrong-properties\n\t\t\t\t */\n\t\t\t\tthrow new CKEditorError( 'observable-unbind-wrong-properties', this );\n\t\t\t}\n\n\t\t\tunbindProperties.forEach( propertyName => {\n\t\t\t\tconst binding = boundProperties.get( propertyName );\n\n\t\t\t\t// Nothing to do if the binding is not defined\n\t\t\t\tif ( !binding ) {\n\t\t\t\t\treturn;\n\t\t\t\t}\n\n\t\t\t\tlet toObservable, toProperty, toProperties, toPropertyBindings;\n\n\t\t\t\tbinding.to.forEach( to => {\n\t\t\t\t\t// TODO: ES6 destructuring.\n\t\t\t\t\ttoObservable = to[ 0 ];\n\t\t\t\t\ttoProperty = to[ 1 ];\n\t\t\t\t\ttoProperties = boundObservables.get( toObservable );\n\t\t\t\t\ttoPropertyBindings = toProperties[ toProperty ];\n\n\t\t\t\t\ttoPropertyBindings.delete( binding );\n\n\t\t\t\t\tif ( !toPropertyBindings.size ) {\n\t\t\t\t\t\tdelete toProperties[ toProperty ];\n\t\t\t\t\t}\n\n\t\t\t\t\tif ( !Object.keys( toProperties ).length ) {\n\t\t\t\t\t\tboundObservables.delete( toObservable );\n\t\t\t\t\t\tthis.stopListening( toObservable, 'change' );\n\t\t\t\t\t}\n\t\t\t\t} );\n\n\t\t\t\tboundProperties.delete( propertyName );\n\t\t\t} );\n\t\t} else {\n\t\t\tboundObservables.forEach( ( bindings, boundObservable ) => {\n\t\t\t\tthis.stopListening( boundObservable, 'change' );\n\t\t\t} );\n\n\t\t\tboundObservables.clear();\n\t\t\tboundProperties.clear();\n\t\t}\n\t},\n\n\t/**\n\t * @inheritDoc\n\t */\n\tdecorate( methodName ) {\n\t\tconst originalMethod = this[ methodName ];\n\n\t\tif ( !originalMethod ) {\n\t\t\t/**\n\t\t\t * Cannot decorate an undefined method.\n\t\t\t *\n\t\t\t * @error observablemixin-cannot-decorate-undefined\n\t\t\t * @param {Object} object The object which method should be decorated.\n\t\t\t * @param {String} methodName Name of the method which does not exist.\n\t\t\t */\n\t\t\tthrow new CKEditorError(\n\t\t\t\t'observablemixin-cannot-decorate-undefined',\n\t\t\t\tthis,\n\t\t\t\t{ object: this, methodName }\n\t\t\t);\n\t\t}\n\n\t\tthis.on( methodName, ( evt, args ) => {\n\t\t\tevt.return = originalMethod.apply( this, args );\n\t\t} );\n\n\t\tthis[ methodName ] = function( ...args ) {\n\t\t\treturn this.fire( methodName, args );\n\t\t};\n\t}\n};\n\nextend( ObservableMixin, EmitterMixin );\n\nexport default ObservableMixin;\n\n// Init symbol properties needed for the observable mechanism to work.\n//\n// @private\n// @param {module:utils/observablemixin~ObservableMixin} observable\nfunction initObservable( observable ) {\n\t// Do nothing if already inited.\n\tif ( observable[ observablePropertiesSymbol ] ) {\n\t\treturn;\n\t}\n\n\t// The internal hash containing the observable's state.\n\t//\n\t// @private\n\t// @type {Map}\n\tObject.defineProperty( observable, observablePropertiesSymbol, {\n\t\tvalue: new Map()\n\t} );\n\n\t// Map containing bindings to external observables. It shares the binding objects\n\t// (`{ observable: A, property: 'a', to: ... }`) with {@link module:utils/observablemixin~ObservableMixin#_boundProperties} and\n\t// it is used to observe external observables to update own properties accordingly.\n\t// See {@link module:utils/observablemixin~ObservableMixin#bind}.\n\t//\n\t//\t\tA.bind( 'a', 'b', 'c' ).to( B, 'x', 'y', 'x' );\n\t//\t\tconsole.log( A._boundObservables );\n\t//\n\t//\t\t\tMap( {\n\t//\t\t\t\tB: {\n\t//\t\t\t\t\tx: Set( [\n\t//\t\t\t\t\t\t{ observable: A, property: 'a', to: [ [ B, 'x' ] ] },\n\t//\t\t\t\t\t\t{ observable: A, property: 'c', to: [ [ B, 'x' ] ] }\n\t//\t\t\t\t\t] ),\n\t//\t\t\t\t\ty: Set( [\n\t//\t\t\t\t\t\t{ observable: A, property: 'b', to: [ [ B, 'y' ] ] },\n\t//\t\t\t\t\t] )\n\t//\t\t\t\t}\n\t//\t\t\t} )\n\t//\n\t//\t\tA.bind( 'd' ).to( B, 'z' ).to( C, 'w' ).as( callback );\n\t//\t\tconsole.log( A._boundObservables );\n\t//\n\t//\t\t\tMap( {\n\t//\t\t\t\tB: {\n\t//\t\t\t\t\tx: Set( [\n\t//\t\t\t\t\t\t{ observable: A, property: 'a', to: [ [ B, 'x' ] ] },\n\t//\t\t\t\t\t\t{ observable: A, property: 'c', to: [ [ B, 'x' ] ] }\n\t//\t\t\t\t\t] ),\n\t//\t\t\t\t\ty: Set( [\n\t//\t\t\t\t\t\t{ observable: A, property: 'b', to: [ [ B, 'y' ] ] },\n\t//\t\t\t\t\t] ),\n\t//\t\t\t\t\tz: Set( [\n\t//\t\t\t\t\t\t{ observable: A, property: 'd', to: [ [ B, 'z' ], [ C, 'w' ] ], callback: callback }\n\t//\t\t\t\t\t] )\n\t//\t\t\t\t},\n\t//\t\t\t\tC: {\n\t//\t\t\t\t\tw: Set( [\n\t//\t\t\t\t\t\t{ observable: A, property: 'd', to: [ [ B, 'z' ], [ C, 'w' ] ], callback: callback }\n\t//\t\t\t\t\t] )\n\t//\t\t\t\t}\n\t//\t\t\t} )\n\t//\n\t// @private\n\t// @type {Map}\n\tObject.defineProperty( observable, boundObservablesSymbol, {\n\t\tvalue: new Map()\n\t} );\n\n\t// Object that stores which properties of this observable are bound and how. It shares\n\t// the binding objects (`{ observable: A, property: 'a', to: ... }`) with\n\t// {@link module:utils/observablemixin~ObservableMixin#_boundObservables}. This data structure is\n\t// a reverse of {@link module:utils/observablemixin~ObservableMixin#_boundObservables} and it is helpful for\n\t// {@link module:utils/observablemixin~ObservableMixin#unbind}.\n\t//\n\t// See {@link module:utils/observablemixin~ObservableMixin#bind}.\n\t//\n\t//\t\tA.bind( 'a', 'b', 'c' ).to( B, 'x', 'y', 'x' );\n\t//\t\tconsole.log( A._boundProperties );\n\t//\n\t//\t\t\tMap( {\n\t//\t\t\t\ta: { observable: A, property: 'a', to: [ [ B, 'x' ] ] },\n\t//\t\t\t\tb: { observable: A, property: 'b', to: [ [ B, 'y' ] ] },\n\t//\t\t\t\tc: { observable: A, property: 'c', to: [ [ B, 'x' ] ] }\n\t//\t\t\t} )\n\t//\n\t//\t\tA.bind( 'd' ).to( B, 'z' ).to( C, 'w' ).as( callback );\n\t//\t\tconsole.log( A._boundProperties );\n\t//\n\t//\t\t\tMap( {\n\t//\t\t\t\ta: { observable: A, property: 'a', to: [ [ B, 'x' ] ] },\n\t//\t\t\t\tb: { observable: A, property: 'b', to: [ [ B, 'y' ] ] },\n\t//\t\t\t\tc: { observable: A, property: 'c', to: [ [ B, 'x' ] ] },\n\t//\t\t\t\td: { observable: A, property: 'd', to: [ [ B, 'z' ], [ C, 'w' ] ], callback: callback }\n\t//\t\t\t} )\n\t//\n\t// @private\n\t// @type {Map}\n\tObject.defineProperty( observable, boundPropertiesSymbol, {\n\t\tvalue: new Map()\n\t} );\n}\n\n// A chaining for {@link module:utils/observablemixin~ObservableMixin#bind} providing `.to()` interface.\n//\n// @private\n// @param {...[Observable|String|Function]} args Arguments of the `.to( args )` binding.\nfunction bindTo( ...args ) {\n\tconst parsedArgs = parseBindToArgs( ...args );\n\tconst bindingsKeys = Array.from( this._bindings.keys() );\n\tconst numberOfBindings = bindingsKeys.length;\n\n\t// Eliminate A.bind( 'x' ).to( B, C )\n\tif ( !parsedArgs.callback && parsedArgs.to.length > 1 ) {\n\t\t/**\n\t\t * Binding multiple observables only possible with callback.\n\t\t *\n\t\t * @error observable-bind-to-no-callback\n\t\t */\n\t\tthrow new CKEditorError( 'observable-bind-to-no-callback', this );\n\t}\n\n\t// Eliminate A.bind( 'x', 'y' ).to( B, callback )\n\tif ( numberOfBindings > 1 && parsedArgs.callback ) {\n\t\t/**\n\t\t * Cannot bind multiple properties and use a callback in one binding.\n\t\t *\n\t\t * @error observable-bind-to-extra-callback\n\t\t */\n\t\tthrow new CKEditorError(\n\t\t\t'observable-bind-to-extra-callback',\n\t\t\tthis\n\t\t);\n\t}\n\n\tparsedArgs.to.forEach( to => {\n\t\t// Eliminate A.bind( 'x', 'y' ).to( B, 'a' )\n\t\tif ( to.properties.length && to.properties.length !== numberOfBindings ) {\n\t\t\t/**\n\t\t\t * The number of properties must match.\n\t\t\t *\n\t\t\t * @error observable-bind-to-properties-length\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'observable-bind-to-properties-length', this );\n\t\t}\n\n\t\t// When no to.properties specified, observing source properties instead i.e.\n\t\t// A.bind( 'x', 'y' ).to( B ) -> Observe B.x and B.y\n\t\tif ( !to.properties.length ) {\n\t\t\tto.properties = this._bindProperties;\n\t\t}\n\t} );\n\n\tthis._to = parsedArgs.to;\n\n\t// Fill {@link BindChain#_bindings} with callback. When the callback is set there's only one binding.\n\tif ( parsedArgs.callback ) {\n\t\tthis._bindings.get( bindingsKeys[ 0 ] ).callback = parsedArgs.callback;\n\t}\n\n\tattachBindToListeners( this._observable, this._to );\n\n\t// Update observable._boundProperties and observable._boundObservables.\n\tupdateBindToBound( this );\n\n\t// Set initial values of bound properties.\n\tthis._bindProperties.forEach( propertyName => {\n\t\tupdateBoundObservableProperty( this._observable, propertyName );\n\t} );\n}\n\n// Binds to an attribute in a set of iterable observables.\n//\n// @private\n// @param {Array.<Observable>} observables\n// @param {String} attribute\n// @param {Function} callback\nfunction bindToMany( observables, attribute, callback ) {\n\tif ( this._bindings.size > 1 ) {\n\t\t/**\n\t\t * Binding one attribute to many observables only possible with one attribute.\n\t\t *\n\t\t * @error observable-bind-to-many-not-one-binding\n\t\t */\n\t\tthrow new CKEditorError( 'observable-bind-to-many-not-one-binding', this );\n\t}\n\n\tthis.to(\n\t\t// Bind to #attribute of each observable...\n\t\t...getBindingTargets( observables, attribute ),\n\t\t// ...using given callback to parse attribute values.\n\t\tcallback\n\t);\n}\n\n// Returns an array of binding components for\n// {@link Observable#bind} from a set of iterable observables.\n//\n// @param {Array.<Observable>} observables\n// @param {String} attribute\n// @returns {Array.<String|Observable>}\nfunction getBindingTargets( observables, attribute ) {\n\tconst observableAndAttributePairs = observables.map( observable => [ observable, attribute ] );\n\n\t// Merge pairs to one-dimension array of observables and attributes.\n\treturn Array.prototype.concat.apply( [], observableAndAttributePairs );\n}\n\n// Check if all entries of the array are of `String` type.\n//\n// @private\n// @param {Array} arr An array to be checked.\n// @returns {Boolean}\nfunction isStringArray( arr ) {\n\treturn arr.every( a => typeof a == 'string' );\n}\n\n// Parses and validates {@link Observable#bind}`.to( args )` arguments and returns\n// an object with a parsed structure. For example\n//\n//\t\tA.bind( 'x' ).to( B, 'a', C, 'b', call );\n//\n// becomes\n//\n//\t\t{\n//\t\t\tto: [\n//\t\t\t\t{ observable: B, properties: [ 'a' ] },\n//\t\t\t\t{ observable: C, properties: [ 'b' ] },\n//\t\t\t],\n//\t\t\tcallback: call\n// \t\t}\n//\n// @private\n// @param {...*} args Arguments of {@link Observable#bind}`.to( args )`.\n// @returns {Object}\nfunction parseBindToArgs( ...args ) {\n\t// Eliminate A.bind( 'x' ).to()\n\tif ( !args.length ) {\n\t\t/**\n\t\t * Invalid argument syntax in `to()`.\n\t\t *\n\t\t * @error observable-bind-to-parse-error\n\t\t */\n\t\tthrow new CKEditorError( 'observable-bind-to-parse-error', null );\n\t}\n\n\tconst parsed = { to: [] };\n\tlet lastObservable;\n\n\tif ( typeof args[ args.length - 1 ] == 'function' ) {\n\t\tparsed.callback = args.pop();\n\t}\n\n\targs.forEach( a => {\n\t\tif ( typeof a == 'string' ) {\n\t\t\tlastObservable.properties.push( a );\n\t\t} else if ( typeof a == 'object' ) {\n\t\t\tlastObservable = { observable: a, properties: [] };\n\t\t\tparsed.to.push( lastObservable );\n\t\t} else {\n\t\t\tthrow new CKEditorError( 'observable-bind-to-parse-error', null );\n\t\t}\n\t} );\n\n\treturn parsed;\n}\n\n// Synchronizes {@link module:utils/observablemixin#_boundObservables} with {@link Binding}.\n//\n// @private\n// @param {Binding} binding A binding to store in {@link Observable#_boundObservables}.\n// @param {Observable} toObservable A observable, which is a new component of `binding`.\n// @param {String} toPropertyName A name of `toObservable`'s property, a new component of the `binding`.\nfunction updateBoundObservables( observable, binding, toObservable, toPropertyName ) {\n\tconst boundObservables = observable[ boundObservablesSymbol ];\n\tconst bindingsToObservable = boundObservables.get( toObservable );\n\tconst bindings = bindingsToObservable || {};\n\n\tif ( !bindings[ toPropertyName ] ) {\n\t\tbindings[ toPropertyName ] = new Set();\n\t}\n\n\t// Pass the binding to a corresponding Set in `observable._boundObservables`.\n\tbindings[ toPropertyName ].add( binding );\n\n\tif ( !bindingsToObservable ) {\n\t\tboundObservables.set( toObservable, bindings );\n\t}\n}\n\n// Synchronizes {@link Observable#_boundProperties} and {@link Observable#_boundObservables}\n// with {@link BindChain}.\n//\n// Assuming the following binding being created\n//\n// \t\tA.bind( 'a', 'b' ).to( B, 'x', 'y' );\n//\n// the following bindings were initialized by {@link Observable#bind} in {@link BindChain#_bindings}:\n//\n// \t\t{\n// \t\t\ta: { observable: A, property: 'a', to: [] },\n// \t\t\tb: { observable: A, property: 'b', to: [] },\n// \t\t}\n//\n// Iterate over all bindings in this chain and fill their `to` properties with\n// corresponding to( ... ) arguments (components of the binding), so\n//\n// \t\t{\n// \t\t\ta: { observable: A, property: 'a', to: [ B, 'x' ] },\n// \t\t\tb: { observable: A, property: 'b', to: [ B, 'y' ] },\n// \t\t}\n//\n// Then update the structure of {@link Observable#_boundObservables} with updated\n// binding, so it becomes:\n//\n// \t\tMap( {\n// \t\t\tB: {\n// \t\t\t\tx: Set( [\n// \t\t\t\t\t{ observable: A, property: 'a', to: [ [ B, 'x' ] ] }\n// \t\t\t\t] ),\n// \t\t\t\ty: Set( [\n// \t\t\t\t\t{ observable: A, property: 'b', to: [ [ B, 'y' ] ] },\n// \t\t\t\t] )\n//\t\t\t}\n// \t\t} )\n//\n// @private\n// @param {BindChain} chain The binding initialized by {@link Observable#bind}.\nfunction updateBindToBound( chain ) {\n\tlet toProperty;\n\n\tchain._bindings.forEach( ( binding, propertyName ) => {\n\t\t// Note: For a binding without a callback, this will run only once\n\t\t// like in A.bind( 'x', 'y' ).to( B, 'a', 'b' )\n\t\t// TODO: ES6 destructuring.\n\t\tchain._to.forEach( to => {\n\t\t\ttoProperty = to.properties[ binding.callback ? 0 : chain._bindProperties.indexOf( propertyName ) ];\n\n\t\t\tbinding.to.push( [ to.observable, toProperty ] );\n\t\t\tupdateBoundObservables( chain._observable, binding, to.observable, toProperty );\n\t\t} );\n\t} );\n}\n\n// Updates an property of a {@link Observable} with a value\n// determined by an entry in {@link Observable#_boundProperties}.\n//\n// @private\n// @param {Observable} observable A observable which property is to be updated.\n// @param {String} propertyName An property to be updated.\nfunction updateBoundObservableProperty( observable, propertyName ) {\n\tconst boundProperties = observable[ boundPropertiesSymbol ];\n\tconst binding = boundProperties.get( propertyName );\n\tlet propertyValue;\n\n\t// When a binding with callback is created like\n\t//\n\t// \t\tA.bind( 'a' ).to( B, 'b', C, 'c', callback );\n\t//\n\t// collect B.b and C.c, then pass them to callback to set A.a.\n\tif ( binding.callback ) {\n\t\tpropertyValue = binding.callback.apply( observable, binding.to.map( to => to[ 0 ][ to[ 1 ] ] ) );\n\t} else {\n\t\tpropertyValue = binding.to[ 0 ];\n\t\tpropertyValue = propertyValue[ 0 ][ propertyValue[ 1 ] ];\n\t}\n\n\tif ( Object.prototype.hasOwnProperty.call( observable, propertyName ) ) {\n\t\tobservable[ propertyName ] = propertyValue;\n\t} else {\n\t\tobservable.set( propertyName, propertyValue );\n\t}\n}\n\n// Starts listening to changes in {@link BindChain._to} observables to update\n// {@link BindChain._observable} {@link BindChain._bindProperties}. Also sets the\n// initial state of {@link BindChain._observable}.\n//\n// @private\n// @param {BindChain} chain The chain initialized by {@link Observable#bind}.\nfunction attachBindToListeners( observable, toBindings ) {\n\ttoBindings.forEach( to => {\n\t\tconst boundObservables = observable[ boundObservablesSymbol ];\n\t\tlet bindings;\n\n\t\t// If there's already a chain between the observables (`observable` listens to\n\t\t// `to.observable`), there's no need to create another `change` event listener.\n\t\tif ( !boundObservables.get( to.observable ) ) {\n\t\t\tobservable.listenTo( to.observable, 'change', ( evt, propertyName ) => {\n\t\t\t\tbindings = boundObservables.get( to.observable )[ propertyName ];\n\n\t\t\t\t// Note: to.observable will fire for any property change, react\n\t\t\t\t// to changes of properties which are bound only.\n\t\t\t\tif ( bindings ) {\n\t\t\t\t\tbindings.forEach( binding => {\n\t\t\t\t\t\tupdateBoundObservableProperty( observable, binding.property );\n\t\t\t\t\t} );\n\t\t\t\t}\n\t\t\t} );\n\t\t}\n\t} );\n}\n\n/**\n * An interface which adds \"observable properties\" and data binding functionality.\n *\n * Can be easily implemented by a class by mixing the {@link module:utils/observablemixin~ObservableMixin} mixin.\n *\n * Read more about the usage of this interface in the:\n * * {@glink framework/guides/architecture/core-editor-architecture#event-system-and-observables \"Event system and observables\"}\n * section of the {@glink framework/guides/architecture/core-editor-architecture \"Core editor architecture\"} guide,\n * * {@glink framework/guides/deep-dive/observables \"Observables\" deep dive} guide.\n *\n * @interface Observable\n * @extends module:utils/emittermixin~Emitter\n */\n\n/**\n * Fired when a property changed value.\n *\n *\t\tobservable.set( 'prop', 1 );\n *\n *\t\tobservable.on( 'change:prop', ( evt, propertyName, newValue, oldValue ) => {\n *\t\t\tconsole.log( `${ propertyName } has changed from ${ oldValue } to ${ newValue }` );\n *\t\t} );\n *\n *\t\tobservable.prop = 2; // -> 'prop has changed from 1 to 2'\n *\n * @event change:{property}\n * @param {String} name The property name.\n * @param {*} value The new property value.\n * @param {*} oldValue The previous property value.\n */\n\n/**\n * Fired when a property value is going to be set but is not set yet (before the `change` event is fired).\n *\n * You can control the final value of the property by using\n * the {@link module:utils/eventinfo~EventInfo#return event's `return` property}.\n *\n *\t\tobservable.set( 'prop', 1 );\n *\n *\t\tobservable.on( 'set:prop', ( evt, propertyName, newValue, oldValue ) => {\n *\t\t\tconsole.log( `Value is going to be changed from ${ oldValue } to ${ newValue }` );\n *\t\t\tconsole.log( `Current property value is ${ observable[ propertyName ] }` );\n *\n *\t\t\t// Let's override the value.\n *\t\t\tevt.return = 3;\n *\t\t} );\n *\n *\t\tobservable.on( 'change:prop', ( evt, propertyName, newValue, oldValue ) => {\n *\t\t\tconsole.log( `Value has changed from ${ oldValue } to ${ newValue }` );\n *\t\t} );\n *\n *\t\tobservable.prop = 2; // -> 'Value is going to be changed from 1 to 2'\n *\t\t                     // -> 'Current property value is 1'\n *\t\t                     // -> 'Value has changed from 1 to 3'\n *\n * **Note:** The event is fired even when the new value is the same as the old value.\n *\n * @event set:{property}\n * @param {String} name The property name.\n * @param {*} value The new property value.\n * @param {*} oldValue The previous property value.\n */\n\n/**\n * Creates and sets the value of an observable property of this object. Such a property becomes a part\n * of the state and is observable.\n *\n * It accepts also a single object literal containing key/value pairs with properties to be set.\n *\n * This method throws the `observable-set-cannot-override` error if the observable instance already\n * has a property with the given property name. This prevents from mistakenly overriding existing\n * properties and methods, but means that `foo.set( 'bar', 1 )` may be slightly slower than `foo.bar = 1`.\n *\n * @method #set\n * @param {String|Object} name The property's name or object with `name=>value` pairs.\n * @param {*} [value] The property's value (if `name` was passed in the first parameter).\n */\n\n/**\n * Binds {@link #set observable properties} to other objects implementing the\n * {@link module:utils/observablemixin~Observable} interface.\n *\n * Read more in the {@glink framework/guides/deep-dive/observables#property-bindings dedicated guide}\n * covering the topic of property bindings with some additional examples.\n *\n * Consider two objects: a `button` and an associated `command` (both `Observable`).\n *\n * A simple property binding could be as follows:\n *\n *\t\tbutton.bind( 'isEnabled' ).to( command, 'isEnabled' );\n *\n * or even shorter:\n *\n *\t\tbutton.bind( 'isEnabled' ).to( command );\n *\n * which works in the following way:\n *\n * * `button.isEnabled` **instantly equals** `command.isEnabled`,\n * * whenever `command.isEnabled` changes, `button.isEnabled` will immediately reflect its value.\n *\n * **Note**: To release the binding, use {@link module:utils/observablemixin~Observable#unbind}.\n *\n * You can also \"rename\" the property in the binding by specifying the new name in the `to()` chain:\n *\n *\t\tbutton.bind( 'isEnabled' ).to( command, 'isWorking' );\n *\n * It is possible to bind more than one property at a time to shorten the code:\n *\n *\t\tbutton.bind( 'isEnabled', 'value' ).to( command );\n *\n * which corresponds to:\n *\n *\t\tbutton.bind( 'isEnabled' ).to( command );\n *\t\tbutton.bind( 'value' ).to( command );\n *\n * The binding can include more than one observable, combining multiple data sources in a custom callback:\n *\n *\t\tbutton.bind( 'isEnabled' ).to( command, 'isEnabled', ui, 'isVisible',\n *\t\t\t( isCommandEnabled, isUIVisible ) => isCommandEnabled && isUIVisible );\n *\n * Using a custom callback allows processing the value before passing it to the target property:\n *\n *\t\tbutton.bind( 'isEnabled' ).to( command, 'value', value => value === 'heading1' );\n *\n * It is also possible to bind to the same property in an array of observables.\n * To bind a `button` to multiple commands (also `Observables`) so that each and every one of them\n * must be enabled for the button to become enabled, use the following code:\n *\n *\t\tbutton.bind( 'isEnabled' ).toMany( [ commandA, commandB, commandC ], 'isEnabled',\n *\t\t\t( isAEnabled, isBEnabled, isCEnabled ) => isAEnabled && isBEnabled && isCEnabled );\n *\n * @method #bind\n * @param {...String} bindProperties Observable properties that will be bound to other observable(s).\n * @returns {Object} The bind chain with the `to()` and `toMany()` methods.\n */\n\n/**\n * Removes the binding created with {@link #bind}.\n *\n *\t\t// Removes the binding for the 'a' property.\n *\t\tA.unbind( 'a' );\n *\n *\t\t// Removes bindings for all properties.\n *\t\tA.unbind();\n *\n * @method #unbind\n * @param {...String} [unbindProperties] Observable properties to be unbound. All the bindings will\n * be released if no properties are provided.\n */\n\n/**\n * Turns the given methods of this object into event-based ones. This means that the new method will fire an event\n * (named after the method) and the original action will be plugged as a listener to that event.\n *\n * Read more in the {@glink framework/guides/deep-dive/observables#decorating-object-methods dedicated guide}\n * covering the topic of decorating methods with some additional examples.\n *\n * Decorating the method does not change its behavior (it only adds an event),\n * but it allows to modify it later on by listening to the method's event.\n *\n * For example, to cancel the method execution the event can be {@link module:utils/eventinfo~EventInfo#stop stopped}:\n *\n *\t\tclass Foo {\n *\t\t\tconstructor() {\n *\t\t\t\tthis.decorate( 'method' );\n *\t\t\t}\n *\n *\t\t\tmethod() {\n *\t\t\t\tconsole.log( 'called!' );\n *\t\t\t}\n *\t\t}\n *\n *\t\tconst foo = new Foo();\n *\t\tfoo.on( 'method', ( evt ) => {\n *\t\t\tevt.stop();\n *\t\t}, { priority: 'high' } );\n *\n *\t\tfoo.method(); // Nothing is logged.\n *\n *\n * **Note**: The high {@link module:utils/priorities~PriorityString priority} listener\n * has been used to execute this particular callback before the one which calls the original method\n * (which uses the \"normal\" priority).\n *\n * It is also possible to change the returned value:\n *\n *\t\tfoo.on( 'method', ( evt ) => {\n *\t\t\tevt.return = 'Foo!';\n *\t\t} );\n *\n *\t\tfoo.method(); // -> 'Foo'\n *\n * Finally, it is possible to access and modify the arguments the method is called with:\n *\n *\t\tmethod( a, b ) {\n *\t\t\tconsole.log( `${ a }, ${ b }`  );\n *\t\t}\n *\n *\t\t// ...\n *\n *\t\tfoo.on( 'method', ( evt, args ) => {\n *\t\t\targs[ 0 ] = 3;\n *\n *\t\t\tconsole.log( args[ 1 ] ); // -> 2\n *\t\t}, { priority: 'high' } );\n *\n *\t\tfoo.method( 1, 2 ); // -> '3, 2'\n *\n * @method #decorate\n * @param {String} methodName Name of the method to decorate.\n */\n","/**\n * @license Copyright (c) 2003-2021, 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/fastdiff\n */\n\n/**\n * Finds positions of the first and last change in the given string/array and generates a set of changes:\n *\n *\t\tfastDiff( '12a', '12xyza' );\n *\t\t// [ { index: 2, type: 'insert', values: [ 'x', 'y', 'z' ] } ]\n *\n *\t\tfastDiff( '12a', '12aa' );\n *\t\t// [ { index: 3, type: 'insert', values: [ 'a' ] } ]\n *\n *\t\tfastDiff( '12xyza', '12a' );\n *\t\t// [ { index: 2, type: 'delete', howMany: 3 } ]\n *\n *\t\tfastDiff( [ '1', '2', 'a', 'a' ], [ '1', '2', 'a' ] );\n *\t\t// [ { index: 3, type: 'delete', howMany: 1 } ]\n *\n *\t\tfastDiff( [ '1', '2', 'a', 'b', 'c', '3' ], [ '2', 'a', 'b' ] );\n *\t\t// [ { index: 0, type: 'insert', values: [ '2', 'a', 'b' ] }, { index: 3, type: 'delete', howMany: 6 } ]\n *\n * Passed arrays can contain any type of data, however to compare them correctly custom comparator function\n * should be passed as a third parameter:\n *\n *\t\tfastDiff( [ { value: 1 }, { value: 2 } ], [ { value: 1 }, { value: 3 } ], ( a, b ) => {\n *\t\t\treturn a.value === b.value;\n *\t\t} );\n *\t\t// [ { index: 1, type: 'insert', values: [ { value: 3 } ] }, { index: 2, type: 'delete', howMany: 1 } ]\n *\n * The resulted set of changes can be applied to the input in order to transform it into the output, for example:\n *\n *\t\tlet input = '12abc3';\n *\t\tconst output = '2ab';\n *\t\tconst changes = fastDiff( input, output );\n *\n *\t\tchanges.forEach( change => {\n *\t\t\tif ( change.type == 'insert' ) {\n *\t\t\t\tinput = input.substring( 0, change.index ) + change.values.join( '' ) + input.substring( change.index );\n *\t\t\t} else if ( change.type == 'delete' ) {\n *\t\t\t\tinput = input.substring( 0, change.index ) + input.substring( change.index + change.howMany );\n *\t\t\t}\n *\t\t} );\n *\n *\t\t// input equals output now\n *\n * or in case of arrays:\n *\n *\t\tlet input = [ '1', '2', 'a', 'b', 'c', '3' ];\n *\t\tconst output = [ '2', 'a', 'b' ];\n *\t\tconst changes = fastDiff( input, output );\n *\n *\t\tchanges.forEach( change => {\n *\t\t\tif ( change.type == 'insert' ) {\n *\t\t\t\tinput = input.slice( 0, change.index ).concat( change.values, input.slice( change.index ) );\n *\t\t\t} else if ( change.type == 'delete' ) {\n *\t\t\t\tinput = input.slice( 0, change.index ).concat( input.slice( change.index + change.howMany ) );\n *\t\t\t}\n *\t\t} );\n *\n *\t\t// input equals output now\n *\n * By passing `true` as the fourth parameter (`atomicChanges`) the output of this function will become compatible with\n * the {@link module:utils/diff~diff `diff()`} function:\n *\n *\t\tfastDiff( '12a', '12xyza' );\n *\t\t// [ 'equal', 'equal', 'insert', 'insert', 'insert', 'equal' ]\n *\n * The default output format of this function is compatible with the output format of\n * {@link module:utils/difftochanges~diffToChanges `diffToChanges()`}. The `diffToChanges()` input format is, in turn,\n * compatible with the output of {@link module:utils/diff~diff `diff()`}:\n *\n *\t\tconst a = '1234';\n *\t\tconst b = '12xyz34';\n *\n *\t\t// Both calls will return the same results (grouped changes format).\n *\t\tfastDiff( a, b );\n *\t\tdiffToChanges( diff( a, b ) );\n *\n *\t\t// Again, both calls will return the same results (atomic changes format).\n *\t\tfastDiff( a, b, null, true );\n *\t\tdiff( a, b );\n *\n *\n * @param {Array|String} a Input array or string.\n * @param {Array|String} b Input array or string.\n * @param {Function} [cmp] Optional function used to compare array values, by default `===` (strict equal operator) is used.\n * @param {Boolean} [atomicChanges=false] Whether an array of `inset|delete|equal` operations should\n * be returned instead of changes set. This makes this function compatible with {@link module:utils/diff~diff `diff()`}.\n * @returns {Array} Array of changes.\n */\nexport default function fastDiff( a, b, cmp, atomicChanges = false ) {\n\t// Set the comparator function.\n\tcmp = cmp || function( a, b ) {\n\t\treturn a === b;\n\t};\n\n\t// Convert the string (or any array-like object - eg. NodeList) to an array by using the slice() method because,\n\t// unlike Array.from(), it returns array of UTF-16 code units instead of the code points of a string.\n\t// One code point might be a surrogate pair of two code units. All text offsets are expected to be in code units.\n\t// See ckeditor/ckeditor5#3147.\n\t//\n\t// We need to make sure here that fastDiff() works identical to diff().\n\tif ( !Array.isArray( a ) ) {\n\t\ta = Array.prototype.slice.call( a );\n\t}\n\n\tif ( !Array.isArray( b ) ) {\n\t\tb = Array.prototype.slice.call( b );\n\t}\n\n\t// Find first and last change.\n\tconst changeIndexes = findChangeBoundaryIndexes( a, b, cmp );\n\n\t// Transform into changes array.\n\treturn atomicChanges ? changeIndexesToAtomicChanges( changeIndexes, b.length ) : changeIndexesToChanges( b, changeIndexes );\n}\n\n// Finds position of the first and last change in the given arrays. For example:\n//\n//\t\tconst indexes = findChangeBoundaryIndexes( [ '1', '2', '3', '4' ], [ '1', '3', '4', '2', '4' ] );\n//\t\tconsole.log( indexes ); // { firstIndex: 1, lastIndexOld: 3, lastIndexNew: 4 }\n//\n// The above indexes means that in the first array the modified part is `1[23]4` and in the second array it is `1[342]4`.\n// Based on such indexes, array with `insert`/`delete` operations which allows transforming first value into the second one\n// can be generated.\n//\n// @param {Array} arr1\n// @param {Array} arr2\n// @param {Function} cmp Comparator function.\n// @returns {Object}\n// @returns {Number} return.firstIndex Index of the first change in both values (always the same for both).\n// @returns {Number} result.lastIndexOld Index of the last common value in `arr1`.\n// @returns {Number} result.lastIndexNew Index of the last common value in `arr2`.\nfunction findChangeBoundaryIndexes( arr1, arr2, cmp ) {\n\t// Find the first difference between passed values.\n\tconst firstIndex = findFirstDifferenceIndex( arr1, arr2, cmp );\n\n\t// If arrays are equal return -1 indexes object.\n\tif ( firstIndex === -1 ) {\n\t\treturn { firstIndex: -1, lastIndexOld: -1, lastIndexNew: -1 };\n\t}\n\n\t// Remove the common part of each value and reverse them to make it simpler to find the last difference between them.\n\tconst oldArrayReversed = cutAndReverse( arr1, firstIndex );\n\tconst newArrayReversed = cutAndReverse( arr2, firstIndex );\n\n\t// Find the first difference between reversed values.\n\t// It should be treated as \"how many elements from the end the last difference occurred\".\n\t//\n\t// For example:\n\t//\n\t// \t\t\t\tinitial\t->\tafter cut\t-> reversed:\n\t// oldValue:\t'321ba'\t->\t'21ba'\t\t-> 'ab12'\n\t// newValue:\t'31xba'\t->\t'1xba'\t\t-> 'abx1'\n\t// lastIndex:\t\t\t\t\t\t\t-> 2\n\t//\n\t// So the last change occurred two characters from the end of the arrays.\n\tconst lastIndex = findFirstDifferenceIndex( oldArrayReversed, newArrayReversed, cmp );\n\n\t// Use `lastIndex` to calculate proper offset, starting from the beginning (`lastIndex` kind of starts from the end).\n\tconst lastIndexOld = arr1.length - lastIndex;\n\tconst lastIndexNew = arr2.length - lastIndex;\n\n\treturn { firstIndex, lastIndexOld, lastIndexNew };\n}\n\n// Returns a first index on which given arrays differ. If both arrays are the same, -1 is returned.\n//\n// @param {Array} arr1\n// @param {Array} arr2\n// @param {Function} cmp Comparator function.\n// @returns {Number}\nfunction findFirstDifferenceIndex( arr1, arr2, cmp ) {\n\tfor ( let i = 0; i < Math.max( arr1.length, arr2.length ); i++ ) {\n\t\tif ( arr1[ i ] === undefined || arr2[ i ] === undefined || !cmp( arr1[ i ], arr2[ i ] ) ) {\n\t\t\treturn i;\n\t\t}\n\t}\n\n\treturn -1; // Return -1 if arrays are equal.\n}\n\n// Returns a copy of the given array with `howMany` elements removed starting from the beginning and in reversed order.\n//\n// @param {Array} arr Array to be processed.\n// @param {Number} howMany How many elements from array beginning to remove.\n// @returns {Array} Shortened and reversed array.\nfunction cutAndReverse( arr, howMany ) {\n\treturn arr.slice( howMany ).reverse();\n}\n\n// Generates changes array based on change indexes from `findChangeBoundaryIndexes` function. This function will\n// generate array with 0 (no changes), 1 (deletion or insertion) or 2 records (insertion and deletion).\n//\n// @param {Array} newArray New array for which change indexes were calculated.\n// @param {Object} changeIndexes Change indexes object from `findChangeBoundaryIndexes` function.\n// @returns {Array.<Object>} Array of changes compatible with {@link module:utils/difftochanges~diffToChanges} format.\nfunction changeIndexesToChanges( newArray, changeIndexes ) {\n\tconst result = [];\n\tconst { firstIndex, lastIndexOld, lastIndexNew } = changeIndexes;\n\n\t// Order operations as 'insert', 'delete' array to keep compatibility with {@link module:utils/difftochanges~diffToChanges}\n\t// in most cases. However, 'diffToChanges' does not stick to any order so in some cases\n\t// (for example replacing '12345' with 'abcd') it will generate 'delete', 'insert' order.\n\tif ( lastIndexNew - firstIndex > 0 ) {\n\t\tresult.push( {\n\t\t\tindex: firstIndex,\n\t\t\ttype: 'insert',\n\t\t\tvalues: newArray.slice( firstIndex, lastIndexNew )\n\t\t} );\n\t}\n\n\tif ( lastIndexOld - firstIndex > 0 ) {\n\t\tresult.push( {\n\t\t\tindex: firstIndex + ( lastIndexNew - firstIndex ), // Increase index of what was inserted.\n\t\t\ttype: 'delete',\n\t\t\thowMany: lastIndexOld - firstIndex\n\t\t} );\n\t}\n\n\treturn result;\n}\n\n// Generates array with set `equal|insert|delete` operations based on change indexes from `findChangeBoundaryIndexes` function.\n//\n// @param {Object} changeIndexes Change indexes object from `findChangeBoundaryIndexes` function.\n// @param {Number} newLength Length of the new array on which `findChangeBoundaryIndexes` calculated change indexes.\n// @returns {Array.<String>} Array of changes compatible with {@link module:utils/diff~diff} format.\nfunction changeIndexesToAtomicChanges( changeIndexes, newLength ) {\n\tconst { firstIndex, lastIndexOld, lastIndexNew } = changeIndexes;\n\n\t// No changes.\n\tif ( firstIndex === -1 ) {\n\t\treturn Array( newLength ).fill( 'equal' );\n\t}\n\n\tlet result = [];\n\tif ( firstIndex > 0 ) {\n\t\tresult = result.concat( Array( firstIndex ).fill( 'equal' ) );\n\t}\n\n\tif ( lastIndexNew - firstIndex > 0 ) {\n\t\tresult = result.concat( Array( lastIndexNew - firstIndex ).fill( 'insert' ) );\n\t}\n\n\tif ( lastIndexOld - firstIndex > 0 ) {\n\t\tresult = result.concat( Array( lastIndexOld - firstIndex ).fill( 'delete' ) );\n\t}\n\n\tif ( lastIndexNew < newLength ) {\n\t\tresult = result.concat( Array( newLength - lastIndexNew ).fill( 'equal' ) );\n\t}\n\n\treturn result;\n}\n","/**\n * @license Copyright (c) 2003-2021, 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/version\n */\n\n/* globals window, global */\n\nimport CKEditorError from './ckeditorerror';\n\nconst version = '26.0.0';\n\nexport default version;\n\n/* istanbul ignore next */\nconst windowOrGlobal = typeof window === 'object' ? window : global;\n\n/* istanbul ignore next */\nif ( windowOrGlobal.CKEDITOR_VERSION ) {\n\t/**\n\t * This error is thrown when due to a mistake in how CKEditor 5 was installed or initialized, some\n\t * of its modules were duplicated (evaluated and executed twice). Module duplication leads to inevitable runtime\n\t * errors.\n\t *\n\t * There are many situations in which some modules can be loaded twice. In the worst case scenario,\n\t * you may need to check your project for each of these issues and fix them all.\n\t *\n\t * # Trying to add a plugin to an existing build\n\t *\n\t * If you import an existing CKEditor 5 build and a plugin like this:\n\t *\n\t *\t\timport ClassicEditor from '@ckeditor/ckeditor5-build-classic';\n\t *\t\timport Highlight from '@ckeditor/ckeditor5-highlight/src/highlight';\n\t *\n\t * Then your project loads some CKEditor 5 packages twice. How does it happen?\n\t *\n\t * The build package contains a file which is already compiled with webpack. This means\n\t * that it contains all the necessary code from e.g. `@ckeditor/ckeditor5-engine` and `@ckeditor/ckeditor5-utils`.\n\t *\n\t * However, the `Highlight` plugin imports some of the modules from these packages, too. If you ask webpack to\n\t * build such a project, you will end up with the modules being included (and run) twice &mdash; first, because they are\n\t * included inside the build package, and second, because they are required by the `Highlight` plugin.\n\t *\n\t * Therefore, **you must never add plugins to an existing build** unless your plugin has no dependencies.\n\t *\n\t * Adding plugins to a build is done by taking the source version of this build (so, before it was built with webpack)\n\t * and adding plugins there. In this situation, webpack will know that it only needs to load each plugin once.\n\t *\n\t * Read more in the {@glink builds/guides/integration/installing-plugins \"Installing plugins\"} guide.\n\t *\n\t * # Confused an editor build with an editor implementation\n\t *\n\t * This scenario is very similar to the previous one, but has a different origin.\n\t *\n\t * Let's assume that you wanted to use CKEditor 5 from source, as explained in the\n\t * {@glink builds/guides/integration/advanced-setup#scenario-2-building-from-source \"Building from source\"} section\n\t * or in the {@glink framework/guides/quick-start \"Quick start\"} guide of CKEditor 5 Framework.\n\t *\n\t * The correct way to do so is to import an editor and plugins and run them together like this:\n\t *\n\t *\t\timport ClassicEditor from '@ckeditor/ckeditor5-editor-classic/src/classiceditor';\n\t *\t\timport Essentials from '@ckeditor/ckeditor5-essentials/src/essentials';\n\t *\t\timport Paragraph from '@ckeditor/ckeditor5-paragraph/src/paragraph';\n\t *\t\timport Bold from '@ckeditor/ckeditor5-basic-styles/src/bold';\n\t *\t\timport Italic from '@ckeditor/ckeditor5-basic-styles/src/italic';\n\t *\n\t *\t\tClassicEditor\n\t *\t\t\t.create( document.querySelector( '#editor' ), {\n\t *\t\t\t\tplugins: [ Essentials, Paragraph, Bold, Italic ],\n\t *\t\t\t\ttoolbar: [ 'bold', 'italic' ]\n\t *\t\t\t} )\n\t *\t\t\t.then( editor => {\n\t *\t\t\t\tconsole.log( 'Editor was initialized', editor );\n\t *\t\t\t} )\n\t *\t\t\t.catch( error => {\n\t *\t\t\t\tconsole.error( error.stack );\n\t *\t\t\t} );\n\t *\n\t * However, you might have mistakenly imported a build instead of the source `ClassicEditor`. In this case\n\t * your imports will look like this:\n\t *\n\t *\t\timport ClassicEditor from '@ckeditor/ckeditor5-build-classic';\n\t *\t\timport Essentials from '@ckeditor/ckeditor5-essentials/src/essentials';\n\t *\t\timport Paragraph from '@ckeditor/ckeditor5-paragraph/src/paragraph';\n\t *\t\timport Bold from '@ckeditor/ckeditor5-basic-styles/src/bold';\n\t *\t\timport Italic from '@ckeditor/ckeditor5-basic-styles/src/italic';\n\t *\n\t * This creates the same situation as in the previous section because you use a build together with source plugins.\n\t *\n\t * Remember: `@ckeditor/ckeditor5-build-*` packages contain editor builds and `@ckeditor/ckeditor5-editor-*` contain source editors.\n\t *\n\t * # Loading two or more builds on one page\n\t *\n\t * If you use CKEditor 5 builds, you might have loaded two (or more) `ckeditor.js` files on one web page.\n\t * Check your web page for duplicated `<script>` elements or make sure your page builder/bundler includes CKEditor only once.\n\t *\n\t * If you want to use two different types of editors at once, see the\n\t * {@glink builds/guides/integration/advanced-setup#scenario-3-using-two-different-editors \"Using two different editors\"}\n\t * section.\n\t *\n\t * # Using outdated packages\n\t *\n\t * Building CKEditor 5 from source requires using multiple npm packages. These packages have their dependencies\n\t * to other packages. If you use the latest version of, for example, `@ckeditor/ckeditor5-editor-classic` with\n\t * an outdated version of `@ckeditor/ckeditor5-image`, npm or yarn will need to install two different versions of\n\t * `@ckeditor/ckeditor5-core` because `@ckeditor/ckeditor5-editor-classic` and `@ckeditor/ckeditor5-image` may require\n\t * different versions of the core package.\n\t *\n\t * The solution to this issue is to update all packages to their latest version. We recommend\n\t * using tools like [`npm-check-updates`](https://www.npmjs.com/package/npm-check-updates) which simplify this process.\n\t *\n\t * # Conflicting version of dependencies\n\t *\n\t * This is a special case of the previous scenario. If you use CKEditor 5 with some third-party plugins,\n\t * it may happen that even if you use the latest versions of the official packages and the latest version of\n\t * these third-party packages, there will be a conflict between some of their dependencies.\n\t *\n\t * Such a problem can be resolved by either downgrading CKEditor 5 packages (which we do not recommend) or\n\t * asking the author of the third-party package to upgrade its depdendencies (or forking their project and doing this yourself).\n\t *\n\t * **Note:** All official CKEditor 5 packages (excluding integrations and `ckeditor5-dev-*` packages) are released in the\n\t * same major version. This is &mdash; in the `x.y.z`, the `x` is the same for all packages. This is the simplest way to check\n\t * whether you use packages coming from the same CKEditor 5 version. You can read more about versioning in the\n\t * {@glink framework/guides/support/versioning-policy Versioning policy} guide.\n\t *\n\t * # Packages were duplicated in `node_modules`\n\t *\n\t * In some situations, especially when calling `npm install` multiple times, it may happen\n\t * that npm will not correctly \"deduplicate\" packages.\n\t *\n\t * Normally, npm deduplicates all packages so, for example, `@ckeditor/ckeditor5-core` is installed only once in `node_modules/`.\n\t * However, it is known to fail to do so from time to time.\n\t *\n\t * We recommend checking if any of the steps listed below help:\n\t *\n\t * * `rm -rf node_modules && npm install` to make sure you have a clean `node_modules/` directory. This step\n\t * is known to help in most cases.\n\t * * If you use `yarn.lock` or `package-lock.json`, remove it before `npm install`.\n\t * * Check whether all CKEditor 5 packages are up to date and reinstall them\n\t * if you changed anything (`rm -rf node_modules && npm install`).\n\t *\n\t * If all packages are correct and compatible with each other, the steps above are known to help. If not, you may\n\t * try to check with `npm ls` how many times packages like `@ckeditor/ckeditor5-core`, `@ckeditor/ckeditor5-engine` and\n\t *`@ckeditor/ckeditor5-utils` are installed. If more than once, verify which package causes that.\n\t *\n\t * @error ckeditor-duplicated-modules\n\t */\n\tthrow new CKEditorError(\n\t\t'ckeditor-duplicated-modules',\n\t\tnull\n\t);\n} else {\n\twindowOrGlobal.CKEDITOR_VERSION = version;\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/isiterable\n */\n\n/**\n * Checks if value implements iterator interface.\n *\n * @param {*} value The value to check.\n * @returns {Boolean} True if value implements iterator interface.\n */\nexport default function isIterable( value ) {\n\treturn !!( value && value[ Symbol.iterator ] );\n}\n","/**\n * @license Copyright (c) 2003-2021, 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/uid\n */\n\n// A hash table of hex numbers to avoid using toString() in uid() which is costly.\n// [ '00', '01', '02', ..., 'fe', 'ff' ]\nconst HEX_NUMBERS = new Array( 256 ).fill()\n\t.map( ( val, index ) => ( '0' + ( index ).toString( 16 ) ).slice( -2 ) );\n\n/**\n * Returns a unique id. The id starts with an \"e\" character and a randomly generated string of\n * 32 alphanumeric characters.\n *\n * **Note**: The characters the unique id is built from correspond to the hex number notation\n * (from \"0\" to \"9\", from \"a\" to \"f\"). In other words, each id corresponds to an \"e\" followed\n * by 16 8-bit numbers next to each other.\n *\n * @returns {String} An unique id string.\n */\nexport default function uid() {\n\t// Let's create some positive random 32bit integers first.\n\t//\n\t// 1. Math.random() is a float between 0 and 1.\n\t// 2. 0x100000000 is 2^32 = 4294967296.\n\t// 3. >>> 0 enforces integer (in JS all numbers are floating point).\n\t//\n\t// For instance:\n\t//\t\tMath.random() * 0x100000000 = 3366450031.853859\n\t// but\n\t//\t\tMath.random() * 0x100000000 >>> 0 = 3366450031.\n\tconst r1 = Math.random() * 0x100000000 >>> 0;\n\tconst r2 = Math.random() * 0x100000000 >>> 0;\n\tconst r3 = Math.random() * 0x100000000 >>> 0;\n\tconst r4 = Math.random() * 0x100000000 >>> 0;\n\n\t// Make sure that id does not start with number.\n\treturn 'e' +\n\t\tHEX_NUMBERS[ r1 >> 0 & 0xFF ] +\n\t\tHEX_NUMBERS[ r1 >> 8 & 0xFF ] +\n\t\tHEX_NUMBERS[ r1 >> 16 & 0xFF ] +\n\t\tHEX_NUMBERS[ r1 >> 24 & 0xFF ] +\n\t\tHEX_NUMBERS[ r2 >> 0 & 0xFF ] +\n\t\tHEX_NUMBERS[ r2 >> 8 & 0xFF ] +\n\t\tHEX_NUMBERS[ r2 >> 16 & 0xFF ] +\n\t\tHEX_NUMBERS[ r2 >> 24 & 0xFF ] +\n\t\tHEX_NUMBERS[ r3 >> 0 & 0xFF ] +\n\t\tHEX_NUMBERS[ r3 >> 8 & 0xFF ] +\n\t\tHEX_NUMBERS[ r3 >> 16 & 0xFF ] +\n\t\tHEX_NUMBERS[ r3 >> 24 & 0xFF ] +\n\t\tHEX_NUMBERS[ r4 >> 0 & 0xFF ] +\n\t\tHEX_NUMBERS[ r4 >> 8 & 0xFF ] +\n\t\tHEX_NUMBERS[ r4 >> 16 & 0xFF ] +\n\t\tHEX_NUMBERS[ r4 >> 24 & 0xFF ];\n}\n"],"sourceRoot":""}