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All rights reserved.\n * For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license\n */\n\n/**\n * @module engine/view/styles/utils\n */\n\nconst HEX_COLOR_REGEXP = /^#([0-9a-f]{3,4}|[0-9a-f]{6}|[0-9a-f]{8})$/i;\nconst RGB_COLOR_REGEXP = /^rgb\\([ ]?([0-9]{1,3}[ %]?,[ ]?){2,3}[0-9]{1,3}[ %]?\\)$/i;\nconst RGBA_COLOR_REGEXP = /^rgba\\([ ]?([0-9]{1,3}[ %]?,[ ]?){3}(1|[0-9]+%|[0]?\\.?[0-9]+)\\)$/i;\nconst HSL_COLOR_REGEXP = /^hsl\\([ ]?([0-9]{1,3}[ %]?[,]?[ ]*){3}(1|[0-9]+%|[0]?\\.?[0-9]+)?\\)$/i;\nconst HSLA_COLOR_REGEXP = /^hsla\\([ ]?([0-9]{1,3}[ %]?,[ ]?){2,3}(1|[0-9]+%|[0]?\\.?[0-9]+)\\)$/i;\n\nconst COLOR_NAMES = new Set( [\n\t// CSS Level 1\n\t'black', 'silver', 'gray', 'white', 'maroon', 'red', 'purple', 'fuchsia',\n\t'green', 'lime', 'olive', 'yellow', 'navy', 'blue', 'teal', 'aqua',\n\t// CSS Level 2 (Revision 1)\n\t'orange',\n\t// CSS Color Module Level 3\n\t'aliceblue', 'antiquewhite', 'aquamarine', 'azure', 'beige', 'bisque', 'blanchedalmond', 'blueviolet', 'brown',\n\t'burlywood', 'cadetblue', 'chartreuse', 'chocolate', 'coral', 'cornflowerblue', 'cornsilk', 'crimson', 'cyan',\n\t'darkblue', 'darkcyan', 'darkgoldenrod', 'darkgray', 'darkgreen', 'darkgrey', 'darkkhaki', 'darkmagenta',\n\t'darkolivegreen', 'darkorange', 'darkorchid', 'darkred', 'darksalmon', 'darkseagreen', 'darkslateblue',\n\t'darkslategray', 'darkslategrey', 'darkturquoise', 'darkviolet', 'deeppink', 'deepskyblue', 'dimgray', 'dimgrey',\n\t'dodgerblue', 'firebrick', 'floralwhite', 'forestgreen', 'gainsboro', 'ghostwhite', 'gold', 'goldenrod',\n\t'greenyellow', 'grey', 'honeydew', 'hotpink', 'indianred', 'indigo', 'ivory', 'khaki', 'lavender', 'lavenderblush',\n\t'lawngreen', 'lemonchiffon', 'lightblue', 'lightcoral', 'lightcyan', 'lightgoldenrodyellow', 'lightgray',\n\t'lightgreen', 'lightgrey', 'lightpink', 'lightsalmon', 'lightseagreen', 'lightskyblue', 'lightslategray',\n\t'lightslategrey', 'lightsteelblue', 'lightyellow', 'limegreen', 'linen', 'magenta', 'mediumaquamarine',\n\t'mediumblue', 'mediumorchid', 'mediumpurple', 'mediumseagreen', 'mediumslateblue', 'mediumspringgreen',\n\t'mediumturquoise', 'mediumvioletred', 'midnightblue', 'mintcream', 'mistyrose', 'moccasin', 'navajowhite',\n\t'oldlace', 'olivedrab', 'orangered', 'orchid', 'palegoldenrod', 'palegreen', 'paleturquoise', 'palevioletred',\n\t'papayawhip', 'peachpuff', 'peru', 'pink', 'plum', 'powderblue', 'rosybrown', 'royalblue', 'saddlebrown', 'salmon',\n\t'sandybrown', 'seagreen', 'seashell', 'sienna', 'skyblue', 'slateblue', 'slategray', 'slategrey', 'snow',\n\t'springgreen', 'steelblue', 'tan', 'thistle', 'tomato', 'turquoise', 'violet', 'wheat', 'whitesmoke', 'yellowgreen',\n\t// CSS Color Module Level 4\n\t'rebeccapurple',\n\t// Keywords\n\t'currentcolor', 'transparent'\n] );\n\n/**\n * Checks if string contains [color](https://developer.mozilla.org/en-US/docs/Web/CSS/color) CSS value.\n *\n *\t\tisColor( '#f00' );\t\t\t\t\t\t// true\n *\t\tisColor( '#AA00BB33' );\t\t\t\t\t// true\n *\t\tisColor( 'rgb(0, 0, 250)' );\t\t\t// true\n *\t\tisColor( 'hsla(240, 100%, 50%, .7)' );\t// true\n *\t\tisColor( 'deepskyblue' );\t\t\t\t// true\n *\n * **Note**: It does not support CSS Level 4 whitespace syntax, system colors and radius values for HSL colors.\n *\n * @param {String} string\n * @returns {Boolean}\n */\nexport function isColor( string ) {\n\t// As far as I was able to test checking some pre-conditions is faster than joining each test with ||.\n\tif ( string.startsWith( '#' ) ) {\n\t\treturn HEX_COLOR_REGEXP.test( string );\n\t}\n\n\tif ( string.startsWith( 'rgb' ) ) {\n\t\treturn RGB_COLOR_REGEXP.test( string ) || RGBA_COLOR_REGEXP.test( string );\n\t}\n\n\tif ( string.startsWith( 'hsl' ) ) {\n\t\treturn HSL_COLOR_REGEXP.test( string ) || HSLA_COLOR_REGEXP.test( string );\n\t}\n\n\t// Array check > RegExp test.\n\treturn COLOR_NAMES.has( string.toLowerCase() );\n}\n\nconst lineStyleValues = [ 'none', 'hidden', 'dotted', 'dashed', 'solid', 'double', 'groove', 'ridge', 'inset', 'outset' ];\n\n/**\n * Checks if string contains [line style](https://developer.mozilla.org/en-US/docs/Web/CSS/border-style) CSS value.\n *\n * @param {String} string\n * @returns {Boolean}\n */\nexport function isLineStyle( string ) {\n\treturn lineStyleValues.includes( string );\n}\n\nconst lengthRegExp = /^([+-]?[0-9]*([.][0-9]+)?(px|cm|mm|in|pc|pt|ch|em|ex|rem|vh|vw|vmin|vmax)|0)$/;\n\n/**\n * Checks if string contains [length](https://developer.mozilla.org/en-US/docs/Web/CSS/length) CSS value.\n *\n * @param {String} string\n * @returns {Boolean}\n */\nexport function isLength( string ) {\n\treturn lengthRegExp.test( string );\n}\n\nconst PERCENTAGE_VALUE_REGEXP = /^[+-]?[0-9]*([.][0-9]+)?%$/;\n\n/**\n * Checks if string contains [percentage](https://developer.mozilla.org/en-US/docs/Web/CSS/percentage) CSS value.\n *\n * @param {String} string\n * @returns {Boolean}\n */\nexport function isPercentage( string ) {\n\treturn PERCENTAGE_VALUE_REGEXP.test( string );\n}\n\nconst repeatValues = [ 'repeat-x', 'repeat-y', 'repeat', 'space', 'round', 'no-repeat' ];\n\n/**\n * Checks if string contains [background repeat](https://developer.mozilla.org/en-US/docs/Web/CSS/background-repeat) CSS value.\n *\n * @param {String} string\n * @returns {Boolean}\n */\nexport function isRepeat( string ) {\n\treturn repeatValues.includes( string );\n}\n\nconst positionValues = [ 'center', 'top', 'bottom', 'left', 'right' ];\n\n/**\n * Checks if string contains [background position](https://developer.mozilla.org/en-US/docs/Web/CSS/background-position) CSS value.\n *\n * @param {String} string\n * @returns {Boolean}\n */\nexport function isPosition( string ) {\n\treturn positionValues.includes( string );\n}\n\nconst attachmentValues = [ 'fixed', 'scroll', 'local' ];\n\n/**\n * Checks if string contains [background attachment](https://developer.mozilla.org/en-US/docs/Web/CSS/background-attachment) CSS value.\n *\n * @param {String} string\n * @returns {Boolean}\n */\nexport function isAttachment( string ) {\n\treturn attachmentValues.includes( string );\n}\n\nconst urlRegExp = /^url\\(/;\n\n/**\n * Checks if string contains [URL](https://developer.mozilla.org/en-US/docs/Web/CSS/url) CSS value.\n *\n * @param {String} string\n * @returns {Boolean}\n */\nexport function isURL( string ) {\n\treturn urlRegExp.test( string );\n}\n\nexport function getBoxSidesValues( value = '' ) {\n\tif ( value === '' ) {\n\t\treturn { top: undefined, right: undefined, bottom: undefined, left: undefined };\n\t}\n\n\tconst values = getShorthandValues( value );\n\n\tconst top = values[ 0 ];\n\tconst bottom = values[ 2 ] || top;\n\tconst right = values[ 1 ] || top;\n\tconst left = values[ 3 ] || right;\n\n\treturn { top, bottom, right, left };\n}\n\n/**\n * Default reducer for CSS properties that concerns edges of a box\n * [shorthand](https://developer.mozilla.org/en-US/docs/Web/CSS/Shorthand_properties) notations:\n *\n *\t\tstylesProcessor.setReducer( 'padding', getBoxSidesValueReducer( 'padding' ) );\n *\n * @param {String} styleShorthand\n * @returns {Function}\n */\nexport function getBoxSidesValueReducer( styleShorthand ) {\n\treturn value => {\n\t\tconst { top, right, bottom, left } = value;\n\n\t\tconst reduced = [];\n\n\t\tif ( ![ top, right, left, bottom ].every( value => !!value ) ) {\n\t\t\tif ( top ) {\n\t\t\t\treduced.push( [ styleShorthand + '-top', top ] );\n\t\t\t}\n\n\t\t\tif ( right ) {\n\t\t\t\treduced.push( [ styleShorthand + '-right', right ] );\n\t\t\t}\n\n\t\t\tif ( bottom ) {\n\t\t\t\treduced.push( [ styleShorthand + '-bottom', bottom ] );\n\t\t\t}\n\n\t\t\tif ( left ) {\n\t\t\t\treduced.push( [ styleShorthand + '-left', left ] );\n\t\t\t}\n\t\t} else {\n\t\t\treduced.push( [ styleShorthand, getBoxSidesShorthandValue( value ) ] );\n\t\t}\n\n\t\treturn reduced;\n\t};\n}\n\n/**\n * Returns a [shorthand](https://developer.mozilla.org/en-US/docs/Web/CSS/Shorthand_properties) notation\n * of a CSS property value.\n *\n *\t\tgetBoxSidesShorthandValue( { top: '1px', right: '1px', bottom: '2px', left: '1px' } );\n *\t\t// will return '1px 1px 2px'\n *\n * @param {module:engine/view/stylesmap~BoxSides} styleShorthand\n * @returns {String}\n */\nexport function getBoxSidesShorthandValue( { top, right, bottom, left } ) {\n\tconst out = [];\n\n\tif ( left !== right ) {\n\t\tout.push( top, right, bottom, left );\n\t} else if ( bottom !== top ) {\n\t\tout.push( top, right, bottom );\n\t} else if ( right !== top ) {\n\t\tout.push( top, right );\n\t} else {\n\t\tout.push( top );\n\t}\n\n\treturn out.join( ' ' );\n}\n\n/**\n * Creates a normalizer for a [shorthand](https://developer.mozilla.org/en-US/docs/Web/CSS/Shorthand_properties) 1-to-4 value.\n *\n *\t\tstylesProcessor.setNormalizer( 'margin', getPositionShorthandNormalizer( 'margin' ) );\n *\n * @param {String} shorthand\n * @returns {Function}\n */\nexport function getPositionShorthandNormalizer( shorthand ) {\n\treturn value => {\n\t\treturn {\n\t\t\tpath: shorthand,\n\t\t\tvalue: getBoxSidesValues( value )\n\t\t};\n\t};\n}\n\n/**\n * Parses parts of a 1-to-4 value notation - handles some CSS values with spaces (like RGB()).\n *\n *\t\tgetShorthandValues( 'red blue RGB(0, 0, 0)');\n *\t\t// will return [ 'red', 'blue', 'RGB(0, 0, 0)' ]\n *\n * @param {String} string\n * @returns {Array.<String>}\n */\nexport function getShorthandValues( string ) {\n\treturn string\n\t\t.replace( /, /g, ',' ) // Exclude comma from spaces evaluation as values are separated by spaces.\n\t\t.split( ' ' )\n\t\t.map( string => string.replace( /,/g, ', ' ) ); // Restore original notation.\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 engine/view/stylesmap\n */\n\nimport { get, isObject, merge, set, unset } from 'lodash-es';\n\n/**\n * Styles map. Allows handling (adding, removing, retrieving) a set of style rules (usually, of an element).\n *\n * The styles map is capable of normalizing style names so e.g. the following operations are possible:\n */\nexport default class StylesMap {\n\t/**\n\t * Creates Styles instance.\n\t *\n\t * @param {module:engine/view/stylesmap~StylesProcessor} styleProcessor\n\t */\n\tconstructor( styleProcessor ) {\n\t\t/**\n\t\t * Keeps an internal representation of styles map. Normalized styles are kept as object tree to allow unified modification and\n\t\t * value access model using lodash's get, set, unset, etc methods.\n\t\t *\n\t\t * When no style processor rules are defined it acts as simple key-value storage.\n\t\t *\n\t\t * @private\n\t\t * @type {Object}\n\t\t */\n\t\tthis._styles = {};\n\n\t\t/**\n\t\t * An instance of the {@link module:engine/view/stylesmap~StylesProcessor}.\n\t\t *\n\t\t * @private\n\t\t * @member {module:engine/view/stylesmap~StylesProcessor}\n\t\t */\n\t\tthis._styleProcessor = styleProcessor;\n\t}\n\n\t/**\n\t * Returns true if style map has no styles set.\n\t *\n\t * @type {Boolean}\n\t */\n\tget isEmpty() {\n\t\tconst entries = Object.entries( this._styles );\n\t\tconst from = Array.from( entries );\n\n\t\treturn !from.length;\n\t}\n\n\t/**\n\t * Number of styles defined.\n\t *\n\t * @type {Number}\n\t */\n\tget size() {\n\t\tif ( this.isEmpty ) {\n\t\t\treturn 0;\n\t\t}\n\n\t\treturn this.getStyleNames().length;\n\t}\n\n\t/**\n\t * Set styles map to a new value.\n\t *\n\t *\t\tstyles.setTo( 'border:1px solid blue;margin-top:1px;' );\n\t *\n\t * @param {String} inlineStyle\n\t */\n\tsetTo( inlineStyle ) {\n\t\tthis.clear();\n\n\t\tconst parsedStyles = Array.from( parseInlineStyles( inlineStyle ).entries() );\n\n\t\tfor ( const [ key, value ] of parsedStyles ) {\n\t\t\tthis._styleProcessor.toNormalizedForm( key, value, this._styles );\n\t\t}\n\t}\n\n\t/**\n\t * Checks if a given style is set.\n\t *\n\t *\t\tstyles.setTo( 'margin-left:1px;' );\n\t *\n\t *\t\tstyles.has( 'margin-left' );    // -> true\n\t *\t\tstyles.has( 'padding' );        // -> false\n\t *\n\t * **Note**: This check supports normalized style names.\n\t *\n\t *\t\t// Enable 'margin' shorthand processing:\n\t *\t\teditor.data.addStyleProcessorRules( addMarginRules );\n\t *\n\t *\t\tstyles.setTo( 'margin:2px;' );\n\t *\n\t *\t\tstyles.has( 'margin' );         // -> true\n\t *\t\tstyles.has( 'margin-top' );     // -> true\n\t *\t\tstyles.has( 'margin-left' );    // -> true\n\t *\n\t *\t\tstyles.remove( 'margin-top' );\n\t *\n\t *\t\tstyles.has( 'margin' );         // -> false\n\t *\t\tstyles.has( 'margin-top' );     // -> false\n\t *\t\tstyles.has( 'margin-left' );    // -> true\n\t *\n\t * @param {String} name Style name.\n\t * @returns {Boolean}\n\t */\n\thas( name ) {\n\t\tif ( this.isEmpty ) {\n\t\t\treturn false;\n\t\t}\n\n\t\tconst styles = this._styleProcessor.getReducedForm( name, this._styles );\n\n\t\tconst propertyDescriptor = styles.find( ( [ property ] ) => property === name );\n\n\t\t// Only return a value if it is set;\n\t\treturn Array.isArray( propertyDescriptor );\n\t}\n\n\t/**\n\t * Sets a given style.\n\t *\n\t * Can insert one by one:\n\t *\n\t *\t\tstyles.set( 'color', 'blue' );\n\t *\t\tstyles.set( 'margin-right', '1em' );\n\t *\n\t * or many styles at once:\n\t *\n\t *\t\tstyles.set( {\n\t *\t\t\tcolor: 'blue',\n\t *\t\t\t'margin-right': '1em'\n\t *\t\t} );\n\t *\n\t * ***Note**:* This method uses {@link module:engine/controller/datacontroller~DataController#addStyleProcessorRules\n\t * enabled style processor rules} to normalize passed values.\n\t *\n\t *\t\t// Enable 'margin' shorthand processing:\n\t *\t\teditor.data.addStyleProcessorRules( addMarginRules );\n\t *\n\t *\t\tstyles.set( 'margin', '2px' );\n\t *\n\t * The above code will set margin to:\n\t *\n\t *\t\tstyles.getNormalized( 'margin' );\n\t *\t\t// -> { top: '2px', right: '2px', bottom: '2px', left: '2px' }\n\t *\n\t * Which makes it possible to retrieve a \"sub-value\":\n\t *\n\t *\t\tstyles.get( 'margin-left' );       // -> '2px'\n\t *\n\t * Or modify it:\n\t *\n\t *\t\tstyles.remove( 'margin-left' );\n\t *\n\t *\t\tstyles.getNormalized( 'margin' );  // -> { top: '1px', bottom: '1px', right: '1px' }\n\t *\t\tstyles.toString();                 // -> 'margin-bottom:1px;margin-right:1px;margin-top:1px;'\n\t *\n\t * This method also allows to set normalized values directly (if a particular styles processor rule was enabled):\n\t *\n\t *\t\tstyles.set( 'border-color', { top: 'blue' } );\n\t *\t\tstyles.set( 'margin', { right: '2em' } );\n\t *\n\t *\t\tstyles.toString();                 // -> 'border-color-top:blue;margin-right:2em;'\n\t *\n\t * @param {String|Object} nameOrObject Style property name or object with multiple properties.\n\t * @param {String|Object} valueOrObject Value to set.\n\t */\n\tset( nameOrObject, valueOrObject ) {\n\t\tif ( isObject( nameOrObject ) ) {\n\t\t\tfor ( const [ key, value ] of Object.entries( nameOrObject ) ) {\n\t\t\t\tthis._styleProcessor.toNormalizedForm( key, value, this._styles );\n\t\t\t}\n\t\t} else {\n\t\t\tthis._styleProcessor.toNormalizedForm( nameOrObject, valueOrObject, this._styles );\n\t\t}\n\t}\n\n\t/**\n\t * Removes given style.\n\t *\n\t *\t\tstyles.setTo( 'background:#f00;margin-right:2px;' );\n\t *\n\t *\t\tstyles.remove( 'background' );\n\t *\n\t *\t\tstyles.toString();   // -> 'margin-right:2px;'\n\t *\n\t * ***Note**:* This method uses {@link module:engine/controller/datacontroller~DataController#addStyleProcessorRules\n\t * enabled style processor rules} to normalize passed values.\n\t *\n\t *\t\t// Enable 'margin' shorthand processing:\n\t *\t\teditor.data.addStyleProcessorRules( addMarginRules );\n\t *\n\t *\t\tstyles.setTo( 'margin:1px' );\n\t *\n\t *\t\tstyles.remove( 'margin-top' );\n\t *\t\tstyles.remove( 'margin-right' );\n\t *\n\t *\t\tstyles.toString(); // -> 'margin-bottom:1px;margin-left:1px;'\n\t *\n\t * @param {String} name Style name.\n\t */\n\tremove( name ) {\n\t\tconst path = toPath( name );\n\n\t\tunset( this._styles, path );\n\t\tdelete this._styles[ name ];\n\n\t\tthis._cleanEmptyObjectsOnPath( path );\n\t}\n\n\t/**\n\t * Returns a normalized style object or a single value.\n\t *\n\t *\t\t// Enable 'margin' shorthand processing:\n\t *\t\teditor.data.addStyleProcessorRules( addMarginRules );\n\t *\n\t *\t\tconst styles = new Styles();\n\t *\t\tstyles.setTo( 'margin:1px 2px 3em;' );\n\t *\n\t *\t\tstyles.getNormalized( 'margin' );\n\t *\t\t// will log:\n\t *\t\t// {\n\t *\t\t//     top: '1px',\n\t *\t\t//     right: '2px',\n\t *\t\t//     bottom: '3em',\n\t *\t\t//     left: '2px'     // normalized value from margin shorthand\n\t *\t\t// }\n\t *\n\t *\t\tstyles.getNormalized( 'margin-left' ); // -> '2px'\n\t *\n\t * **Note**: This method will only return normalized styles if a style processor was defined.\n\t *\n\t * @param {String} name Style name.\n\t * @returns {Object|String|undefined}\n\t */\n\tgetNormalized( name ) {\n\t\treturn this._styleProcessor.getNormalized( name, this._styles );\n\t}\n\n\t/**\n\t * Returns a normalized style string. Styles are sorted by name.\n\t *\n\t *\t\tstyles.set( 'margin' , '1px' );\n\t *\t\tstyles.set( 'background', '#f00' );\n\t *\n\t *\t\tstyles.toString(); // -> 'background:#f00;margin:1px;'\n\t *\n\t * **Note**: This method supports normalized styles if defined.\n\t *\n\t *\t\t// Enable 'margin' shorthand processing:\n\t *\t\teditor.data.addStyleProcessorRules( addMarginRules );\n\t *\n\t *\t\tstyles.set( 'margin' , '1px' );\n\t *\t\tstyles.set( 'background', '#f00' );\n\t *\t\tstyles.remove( 'margin-top' );\n\t *\t\tstyles.remove( 'margin-right' );\n\t *\n\t *\t\tstyles.toString(); // -> 'background:#f00;margin-bottom:1px;margin-left:1px;'\n\t *\n\t * @returns {String}\n\t */\n\ttoString() {\n\t\tif ( this.isEmpty ) {\n\t\t\treturn '';\n\t\t}\n\n\t\treturn this._getStylesEntries()\n\t\t\t.map( arr => arr.join( ':' ) )\n\t\t\t.sort()\n\t\t\t.join( ';' ) + ';';\n\t}\n\n\t/**\n\t * Returns property as a value string or undefined if property is not set.\n\t *\n\t *\t\t// Enable 'margin' shorthand processing:\n\t *\t\teditor.data.addStyleProcessorRules( addMarginRules );\n\t *\n\t *\t\tconst styles = new Styles();\n\t *\t\tstyles.setTo( 'margin:1px;' );\n\t *\t\tstyles.set( 'margin-bottom', '3em' );\n\t *\n\t *\t\tstyles.getAsString( 'margin' ); // -> 'margin: 1px 1px 3em;'\n\t *\n\t * Note, however, that all sub-values must be set for the longhand property name to return a value:\n\t *\n\t *\t\tconst styles = new Styles();\n\t *\t\tstyles.setTo( 'margin:1px;' );\n\t *\t\tstyles.remove( 'margin-bottom' );\n\t *\n\t *\t\tstyles.getAsString( 'margin' ); // -> undefined\n\t *\n\t * In the above scenario, it is not possible to return a `margin` value, so `undefined` is returned.\n\t * Instead, you should use:\n\t *\n\t *\t\tconst styles = new Styles();\n\t *\t\tstyles.setTo( 'margin:1px;' );\n\t *\t\tstyles.remove( 'margin-bottom' );\n\t *\n\t *\t\tfor ( const styleName of styles.getStyleNames() ) {\n\t *\t\t\tconsole.log( styleName, styles.getAsString( styleName ) );\n\t *\t\t}\n\t *\t\t// 'margin-top', '1px'\n\t *\t\t// 'margin-right', '1px'\n\t *\t\t// 'margin-left', '1px'\n\t *\n\t * In general, it is recommend to iterate over style names like in the example above. This way, you will always get all\n\t * the currently set style values. So, if all the 4 margin values would be set\n\t * the for-of loop above would yield only `'margin'`, `'1px'`:\n\t *\n\t *\t\tconst styles = new Styles();\n\t *\t\tstyles.setTo( 'margin:1px;' );\n\t *\n\t *\t\tfor ( const styleName of styles.getStyleNames() ) {\n\t *\t\t\tconsole.log( styleName, styles.getAsString( styleName ) );\n\t *\t\t}\n\t *\t\t// 'margin', '1px'\n\t *\n\t * **Note**: To get a normalized version of a longhand property use the {@link #getNormalized `#getNormalized()`} method.\n\t *\n\t * @param {String} propertyName\n\t * @returns {String|undefined}\n\t */\n\tgetAsString( propertyName ) {\n\t\tif ( this.isEmpty ) {\n\t\t\treturn;\n\t\t}\n\n\t\tif ( this._styles[ propertyName ] && !isObject( this._styles[ propertyName ] ) ) {\n\t\t\t// Try return styles set directly - values that are not parsed.\n\t\t\treturn this._styles[ propertyName ];\n\t\t}\n\n\t\tconst styles = this._styleProcessor.getReducedForm( propertyName, this._styles );\n\n\t\tconst propertyDescriptor = styles.find( ( [ property ] ) => property === propertyName );\n\n\t\t// Only return a value if it is set;\n\t\tif ( Array.isArray( propertyDescriptor ) ) {\n\t\t\treturn propertyDescriptor[ 1 ];\n\t\t}\n\t}\n\n\t/**\n\t * Returns all style properties names as they would appear when using {@link #toString `#toString()`}.\n\t *\n\t * When `expand` is set to true and there's a shorthand style property set, it will also return all equivalent styles:\n\t *\n\t * \t\tstylesMap.setTo( 'margin: 1em' )\n\t *\n\t * will be expanded to:\n\t *\n\t * \t\t[ 'margin', 'margin-top', 'margin-right', 'margin-bottom', 'margin-left' ]\n\t *\n\t * @param {Boolean} [expand=false] Expand shorthand style properties and all return equivalent style representations.\n\t * @returns {Array.<String>}\n\t */\n\tgetStyleNames( expand = false ) {\n\t\tif ( this.isEmpty ) {\n\t\t\treturn [];\n\t\t}\n\n\t\tif ( expand ) {\n\t\t\treturn this._styleProcessor.getStyleNames( this._styles );\n\t\t}\n\n\t\tconst entries = this._getStylesEntries();\n\n\t\treturn entries.map( ( [ key ] ) => key );\n\t}\n\n\t/**\n\t * Removes all styles.\n\t */\n\tclear() {\n\t\tthis._styles = {};\n\t}\n\n\t/**\n\t * Returns normalized styles entries for further processing.\n\t *\n\t * @private\n\t * @returns {Array.<module:engine/view/stylesmap~PropertyDescriptor>}\n\t */\n\t_getStylesEntries() {\n\t\tconst parsed = [];\n\n\t\tconst keys = Object.keys( this._styles );\n\n\t\tfor ( const key of keys ) {\n\t\t\tparsed.push( ...this._styleProcessor.getReducedForm( key, this._styles ) );\n\t\t}\n\n\t\treturn parsed;\n\t}\n\n\t/**\n\t * Removes empty objects upon removing an entry from internal object.\n\t *\n\t * @param {String} path\n\t * @private\n\t */\n\t_cleanEmptyObjectsOnPath( path ) {\n\t\tconst pathParts = path.split( '.' );\n\t\tconst isChildPath = pathParts.length > 1;\n\n\t\tif ( !isChildPath ) {\n\t\t\treturn;\n\t\t}\n\n\t\tconst parentPath = pathParts.splice( 0, pathParts.length - 1 ).join( '.' );\n\n\t\tconst parentObject = get( this._styles, parentPath );\n\n\t\tif ( !parentObject ) {\n\t\t\treturn;\n\t\t}\n\n\t\tconst isParentEmpty = !Array.from( Object.keys( parentObject ) ).length;\n\n\t\tif ( isParentEmpty ) {\n\t\t\tthis.remove( parentPath );\n\t\t}\n\t}\n}\n\n/**\n * Style processor is responsible for writing and reading a normalized styles object.\n */\nexport class StylesProcessor {\n\t/**\n\t * Creates StylesProcessor instance.\n\t *\n\t * @private\n\t */\n\tconstructor() {\n\t\tthis._normalizers = new Map();\n\t\tthis._extractors = new Map();\n\t\tthis._reducers = new Map();\n\t\tthis._consumables = new Map();\n\t}\n\n\t/**\n\t * Parse style string value to a normalized object and appends it to styles object.\n\t *\n\t *\t\tconst styles = {};\n\t *\n\t *\t\tstylesProcessor.toNormalizedForm( 'margin', '1px', styles );\n\t *\n\t *\t\t// styles will consist: { margin: { top: '1px', right: '1px', bottom: '1px', left: '1px; } }\n\t *\n\t * **Note**: To define normalizer callbacks use {@link #setNormalizer}.\n\t *\n\t * @param {String} name Name of style property.\n\t * @param {String} propertyValue Value of style property.\n\t * @param {Object} styles Object holding normalized styles.\n\t */\n\ttoNormalizedForm( name, propertyValue, styles ) {\n\t\tif ( isObject( propertyValue ) ) {\n\t\t\tappendStyleValue( styles, toPath( name ), propertyValue );\n\n\t\t\treturn;\n\t\t}\n\n\t\tif ( this._normalizers.has( name ) ) {\n\t\t\tconst normalizer = this._normalizers.get( name );\n\n\t\t\tconst { path, value } = normalizer( propertyValue );\n\n\t\t\tappendStyleValue( styles, path, value );\n\t\t} else {\n\t\t\tappendStyleValue( styles, name, propertyValue );\n\t\t}\n\t}\n\n\t/**\n\t * Returns a normalized version of a style property.\n\t *\t\tconst styles = {\n\t *\t\t\tmargin: { top: '1px', right: '1px', bottom: '1px', left: '1px; },\n\t *\t\t\tbackground: { color: '#f00' }\n\t *\t\t};\n\t *\n\t *\t\tstylesProcessor.getNormalized( 'background' );\n\t *\t\t// will return: { color: '#f00' }\n\t *\n\t *\t\tstylesProcessor.getNormalized( 'margin-top' );\n\t *\t\t// will return: '1px'\n\t *\n\t * **Note**: In some cases extracting single value requires defining an extractor callback {@link #setExtractor}.\n\t *\n\t * @param {String} name Name of style property.\n\t * @param {Object} styles Object holding normalized styles.\n\t * @returns {*}\n\t */\n\tgetNormalized( name, styles ) {\n\t\tif ( !name ) {\n\t\t\treturn merge( {}, styles );\n\t\t}\n\n\t\t// Might be empty string.\n\t\tif ( styles[ name ] !== undefined ) {\n\t\t\treturn styles[ name ];\n\t\t}\n\n\t\tif ( this._extractors.has( name ) ) {\n\t\t\tconst extractor = this._extractors.get( name );\n\n\t\t\tif ( typeof extractor === 'string' ) {\n\t\t\t\treturn get( styles, extractor );\n\t\t\t}\n\n\t\t\tconst value = extractor( name, styles );\n\n\t\t\tif ( value ) {\n\t\t\t\treturn value;\n\t\t\t}\n\t\t}\n\n\t\treturn get( styles, toPath( name ) );\n\t}\n\n\t/**\n\t * Returns a reduced form of style property form normalized object.\n\t *\n\t * For default margin reducer, the below code:\n\t *\n\t *\t\tstylesProcessor.getReducedForm( 'margin', {\n\t *\t\t\tmargin: { top: '1px', right: '1px', bottom: '2px', left: '1px; }\n\t *\t\t} );\n\t *\n\t * will return:\n\t *\n\t *\t\t[\n\t *\t\t\t[ 'margin', '1px 1px 2px' ]\n\t *\t\t]\n\t *\n\t * because it might be represented as a shorthand 'margin' value. However if one of margin long hand values is missing it should return:\n\t *\n\t *\t\t[\n\t *\t\t\t[ 'margin-top', '1px' ],\n\t *\t\t\t[ 'margin-right', '1px' ],\n\t *\t\t\t[ 'margin-bottom', '2px' ]\n\t *\t\t\t// the 'left' value is missing - cannot use 'margin' shorthand.\n\t *\t\t]\n\t *\n\t * **Note**: To define reducer callbacks use {@link #setReducer}.\n\t *\n\t * @param {String} name Name of style property.\n\t * @param {Object} styles Object holding normalized styles.\n\t * @returns {Array.<module:engine/view/stylesmap~PropertyDescriptor>}\n\t */\n\tgetReducedForm( name, styles ) {\n\t\tconst normalizedValue = this.getNormalized( name, styles );\n\n\t\t// Might be empty string.\n\t\tif ( normalizedValue === undefined ) {\n\t\t\treturn [];\n\t\t}\n\n\t\tif ( this._reducers.has( name ) ) {\n\t\t\tconst reducer = this._reducers.get( name );\n\n\t\t\treturn reducer( normalizedValue );\n\t\t}\n\n\t\treturn [ [ name, normalizedValue ] ];\n\t}\n\n\t/**\n\t * Return all style properties. Also expand shorthand properties (e.g. `margin`, `background`) if respective extractor is available.\n\t *\n\t * @param {Object} styles Object holding normalized styles.\n\t * @returns {Array.<String>}\n\t */\n\tgetStyleNames( styles ) {\n\t\t// Find all extractable styles that have a value.\n\t\tconst expandedStyleNames = Array.from( this._consumables.keys() ).filter( name => {\n\t\t\tconst style = this.getNormalized( name, styles );\n\n\t\t\tif ( style && typeof style == 'object' ) {\n\t\t\t\treturn Object.keys( style ).length;\n\t\t\t}\n\n\t\t\treturn style;\n\t\t} );\n\n\t\t// For simple styles (for example `color`) we don't have a map of those styles\n\t\t// but they are 1 to 1 with normalized object keys.\n\t\tconst styleNamesKeysSet = new Set( [\n\t\t\t...expandedStyleNames,\n\t\t\t...Object.keys( styles )\n\t\t] );\n\n\t\treturn Array.from( styleNamesKeysSet.values() );\n\t}\n\n\t/**\n\t * Returns related style names.\n\t *\n\t *\t\tstylesProcessor.getRelatedStyles( 'margin' );\n\t *\t\t// will return: [ 'margin-top', 'margin-right', 'margin-bottom', 'margin-left' ];\n\t *\n\t *\t\tstylesProcessor.getRelatedStyles( 'margin-top' );\n\t *\t\t// will return: [ 'margin' ];\n\t *\n\t * **Note**: To define new style relations load an existing style processor or use\n\t * {@link module:engine/view/stylesmap~StylesProcessor#setStyleRelation `StylesProcessor.setStyleRelation()`}.\n\t *\n\t * @param {String} name\n\t * @returns {Array.<String>}\n\t */\n\tgetRelatedStyles( name ) {\n\t\treturn this._consumables.get( name ) || [];\n\t}\n\n\t/**\n\t * Adds a normalizer method for a style property.\n\t *\n\t * A normalizer returns describing how the value should be normalized.\n\t *\n\t * For instance 'margin' style is a shorthand for four margin values:\n\t *\n\t * - 'margin-top'\n\t * - 'margin-right'\n\t * - 'margin-bottom'\n\t * - 'margin-left'\n\t *\n\t * and can be written in various ways if some values are equal to others. For instance `'margin: 1px 2em;'` is a shorthand for\n\t * `'margin-top: 1px;margin-right: 2em;margin-bottom: 1px;margin-left: 2em'`.\n\t *\n\t * A normalizer should parse various margin notations as a single object:\n\t *\n\t *\t\tconst styles = {\n\t *\t\t\tmargin: {\n\t *\t\t\t\ttop: '1px',\n\t *\t\t\t\tright: '2em',\n\t *\t\t\t\tbottom: '1px',\n\t *\t\t\t\tleft: '2em'\n\t *\t\t\t}\n\t *\t\t};\n\t *\n\t * Thus a normalizer for 'margin' style should return an object defining style path and value to store:\n\t *\n\t *\t\tconst returnValue = {\n\t *\t\t\tpath: 'margin',\n\t *\t\t\tvalue: {\n\t *\t\t\t\ttop: '1px',\n\t *\t\t\t\tright: '2em',\n\t *\t\t\t\tbottom: '1px',\n\t *\t\t\t\tleft: '2em'\n\t *\t\t\t}\n\t *\t\t};\n\t *\n\t * Additionally to fully support all margin notations there should be also defined 4 normalizers for longhand margin notations. Below\n\t * is an example for 'margin-top' style property normalizer:\n\t *\n\t *\t\tstylesProcessor.setNormalizer( 'margin-top', valueString => {\n\t *\t\t\treturn {\n\t *\t\t\t\tpath: 'margin.top',\n\t *\t\t\t\tvalue: valueString\n\t *\t\t\t}\n\t *\t\t} );\n\t *\n\t * @param {String} name\n\t * @param {Function} callback\n\t */\n\tsetNormalizer( name, callback ) {\n\t\tthis._normalizers.set( name, callback );\n\t}\n\n\t/**\n\t * Adds a extractor callback for a style property.\n\t *\n\t * Most normalized style values are stored as one level objects. It is assumed that `'margin-top'` style will be stored as:\n\t *\n\t *\t\tconst styles = {\n\t *\t\t\tmargin: {\n\t *\t\t\t\ttop: 'value'\n\t *\t\t\t}\n\t *\t\t}\n\t *\n\t * However, some styles can have conflicting notations and thus it might be harder to extract a style value from shorthand. For instance\n\t * the 'border-top-style' can be defined using `'border-top:solid'`, `'border-style:solid none none none'` or by `'border:solid'`\n\t * shorthands. The default border styles processors stores styles as:\n\t *\n\t *\t\tconst styles = {\n\t *\t\t\tborder: {\n\t *\t\t\t\tstyle: {\n\t *\t\t\t\t\ttop: 'solid'\n\t *\t\t\t\t}\n\t *\t\t\t}\n\t *\t\t}\n\t *\n\t * as it is better to modify border style independently from other values. On the other part the output of the border might be\n\t * desired as `border-top`, `border-left`, etc notation.\n\t *\n\t * In the above example a reducer should return a side border value that combines style, color and width:\n\t *\n\t *\t\tstyleProcessor.setExtractor( 'border-top', styles => {\n\t *\t\t\treturn {\n\t *\t\t\t\tcolor: styles.border.color.top,\n\t *\t\t\t\tstyle: styles.border.style.top,\n\t *\t\t\t\twidth: styles.border.width.top\n\t *\t\t\t}\n\t *\t\t} );\n\t *\n\t * @param {String} name\n\t * @param {Function|String} callbackOrPath Callback that return a requested value or path string for single values.\n\t */\n\tsetExtractor( name, callbackOrPath ) {\n\t\tthis._extractors.set( name, callbackOrPath );\n\t}\n\n\t/**\n\t * Adds a reducer callback for a style property.\n\t *\n\t * Reducer returns a minimal notation for given style name. For longhand properties it is not required to write a reducer as\n\t * by default the direct value from style path is taken.\n\t *\n\t * For shorthand styles a reducer should return minimal style notation either by returning single name-value tuple or multiple tuples\n\t * if a shorthand cannot be used. For instance for a margin shorthand a reducer might return:\n\t *\n\t *\t\tconst marginShortHandTuple = [\n\t *\t\t\t[ 'margin', '1px 1px 2px' ]\n\t *\t\t];\n\t *\n\t * or a longhand tuples for defined values:\n\t *\n\t *\t\t// Considering margin.bottom and margin.left are undefined.\n\t *\t\tconst marginLonghandsTuples = [\n\t *\t\t\t[ 'margin-top', '1px' ],\n\t *\t\t\t[ 'margin-right', '1px' ]\n\t *\t\t];\n\t *\n\t * A reducer obtains a normalized style value:\n\t *\n\t *\t\t// Simplified reducer that always outputs 4 values which are always present:\n\t *\t\tstylesProcessor.setReducer( 'margin', margin => {\n\t *\t\t\treturn [\n\t *\t\t\t\t[ 'margin', `${ margin.top } ${ margin.right } ${ margin.bottom } ${ margin.left }` ]\n\t *\t\t\t]\n\t *\t\t} );\n\t *\n\t * @param {String} name\n\t * @param {Function} callback\n\t */\n\tsetReducer( name, callback ) {\n\t\tthis._reducers.set( name, callback );\n\t}\n\n\t/**\n\t * Defines a style shorthand relation to other style notations.\n\t *\n\t *\t\tstylesProcessor.setStyleRelation( 'margin', [\n\t *\t\t\t'margin-top',\n\t *\t\t\t'margin-right',\n\t *\t\t\t'margin-bottom',\n\t *\t\t\t'margin-left'\n\t *\t\t] );\n\t *\n\t * This enables expanding of style names for shorthands. For instance, if defined,\n\t * {@link module:engine/conversion/viewconsumable~ViewConsumable view consumable} items are automatically created\n\t * for long-hand margin style notation alongside the `'margin'` item.\n\t *\n\t * This means that when an element being converted has a style `margin`, a converter for `margin-left` will work just\n\t * fine since the view consumable will contain a consumable `margin-left` item (thanks to the relation) and\n\t * `element.getStyle( 'margin-left' )` will work as well assuming that the style processor was correctly configured.\n\t * However, once `margin-left` is consumed, `margin` will not be consumable anymore.\n\t *\n\t * @param {String} shorthandName\n\t * @param {Array.<String>} styleNames\n\t */\n\tsetStyleRelation( shorthandName, styleNames ) {\n\t\tthis._mapStyleNames( shorthandName, styleNames );\n\n\t\tfor ( const alsoName of styleNames ) {\n\t\t\tthis._mapStyleNames( alsoName, [ shorthandName ] );\n\t\t}\n\t}\n\n\t/**\n\t * Set two-way binding of style names.\n\t *\n\t * @param {String} name\n\t * @param {Array.<String>} styleNames\n\t * @private\n\t */\n\t_mapStyleNames( name, styleNames ) {\n\t\tif ( !this._consumables.has( name ) ) {\n\t\t\tthis._consumables.set( name, [] );\n\t\t}\n\n\t\tthis._consumables.get( name ).push( ...styleNames );\n\t}\n}\n\n// Parses inline styles and puts property - value pairs into styles map.\n//\n// @param {String} stylesString Styles to parse.\n// @returns {Map.<String, String>} stylesMap Map of parsed properties and values.\nfunction parseInlineStyles( stylesString ) {\n\t// `null` if no quote was found in input string or last found quote was a closing quote. See below.\n\tlet quoteType = null;\n\tlet propertyNameStart = 0;\n\tlet propertyValueStart = 0;\n\tlet propertyName = null;\n\n\tconst stylesMap = new Map();\n\n\t// Do not set anything if input string is empty.\n\tif ( stylesString === '' ) {\n\t\treturn stylesMap;\n\t}\n\n\t// Fix inline styles that do not end with `;` so they are compatible with algorithm below.\n\tif ( stylesString.charAt( stylesString.length - 1 ) != ';' ) {\n\t\tstylesString = stylesString + ';';\n\t}\n\n\t// Seek the whole string for \"special characters\".\n\tfor ( let i = 0; i < stylesString.length; i++ ) {\n\t\tconst char = stylesString.charAt( i );\n\n\t\tif ( quoteType === null ) {\n\t\t\t// No quote found yet or last found quote was a closing quote.\n\t\t\tswitch ( char ) {\n\t\t\t\tcase ':':\n\t\t\t\t\t// Most of time colon means that property name just ended.\n\t\t\t\t\t// Sometimes however `:` is found inside property value (for example in background image url).\n\t\t\t\t\tif ( !propertyName ) {\n\t\t\t\t\t\t// Treat this as end of property only if property name is not already saved.\n\t\t\t\t\t\t// Save property name.\n\t\t\t\t\t\tpropertyName = stylesString.substr( propertyNameStart, i - propertyNameStart );\n\t\t\t\t\t\t// Save this point as the start of property value.\n\t\t\t\t\t\tpropertyValueStart = i + 1;\n\t\t\t\t\t}\n\n\t\t\t\t\tbreak;\n\n\t\t\t\tcase '\"':\n\t\t\t\tcase '\\'':\n\t\t\t\t\t// Opening quote found (this is an opening quote, because `quoteType` is `null`).\n\t\t\t\t\tquoteType = char;\n\n\t\t\t\t\tbreak;\n\n\t\t\t\tcase ';': {\n\t\t\t\t\t// Property value just ended.\n\t\t\t\t\t// Use previously stored property value start to obtain property value.\n\t\t\t\t\tconst propertyValue = stylesString.substr( propertyValueStart, i - propertyValueStart );\n\n\t\t\t\t\tif ( propertyName ) {\n\t\t\t\t\t\t// Save parsed part.\n\t\t\t\t\t\tstylesMap.set( propertyName.trim(), propertyValue.trim() );\n\t\t\t\t\t}\n\n\t\t\t\t\tpropertyName = null;\n\n\t\t\t\t\t// Save this point as property name start. Property name starts immediately after previous property value ends.\n\t\t\t\t\tpropertyNameStart = i + 1;\n\n\t\t\t\t\tbreak;\n\t\t\t\t}\n\t\t\t}\n\t\t} else if ( char === quoteType ) {\n\t\t\t// If a quote char is found and it is a closing quote, mark this fact by `null`-ing `quoteType`.\n\t\t\tquoteType = null;\n\t\t}\n\t}\n\n\treturn stylesMap;\n}\n\n// Return lodash compatible path from style name.\nfunction toPath( name ) {\n\treturn name.replace( '-', '.' );\n}\n\n// Appends style definition to the styles object.\n//\n// @param {String} nameOrPath\n// @param {String|Object} valueOrObject\n// @private\nfunction appendStyleValue( stylesObject, nameOrPath, valueOrObject ) {\n\tlet valueToSet = valueOrObject;\n\n\tif ( isObject( valueOrObject ) ) {\n\t\tvalueToSet = merge( {}, get( stylesObject, nameOrPath ), valueOrObject );\n\t}\n\n\tset( stylesObject, nameOrPath, valueToSet );\n}\n\n/**\n * A CSS style property descriptor that contains tuplet of two strings:\n *\n * - first string describes property name\n * - second string describes property value\n *\n *\t\tconst marginDescriptor = [ 'margin', '2px 3em' ];\n *\t\tconst marginTopDescriptor = [ 'margin-top', '2px' ];\n *\n * @typedef {Array.<String, String>} module:engine/view/stylesmap~PropertyDescriptor\n */\n\n/**\n * An object describing values associated with the sides of a box, for instance margins, paddings,\n * border widths, border colors, etc.\n *\n *\t\tconst margin = {\n *\t\t\ttop: '1px',\n *\t\t\tright: '3px',\n *\t\t\tbottom: '3px',\n *\t\t\tleft: '7px'\n *\t\t};\n *\n *\t\tconst borderColor = {\n *\t\t\ttop: 'red',\n *\t\t\tright: 'blue',\n *\t\t\tbottom: 'blue',\n *\t\t\tleft: 'red'\n *\t\t};\n *\n * @typedef {Object} module:engine/view/stylesmap~BoxSides\n *\n * @property {String} top Top side value.\n * @property {String} right Right side value.\n * @property {String} bottom Bottom side value.\n * @property {String} left Left side value.\n */\n"],"sourceRoot":""}