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✏️ Editing: Styles.js

/**
 * Styles.js
 *
 * Released under LGPL License.
 * Copyright (c) 1999-2015 Ephox Corp. All rights reserved
 *
 * License: http://www.tinymce.com/license
 * Contributing: http://www.tinymce.com/contributing
 */

/**
 * This class is used to parse CSS styles it also compresses styles to reduce the output size.
 *
 * @example
 * var Styles = new tinymce.html.Styles({
 *    url_converter: function(url) {
 *       return url;
 *    }
 * });
 *
 * styles = Styles.parse('border: 1px solid red');
 * styles.color = 'red';
 *
 * console.log(new tinymce.html.StyleSerializer().serialize(styles));
 *
 * @class tinymce.html.Styles
 * @version 3.4
 */
define("tinymce/html/Styles", [], function() {
	return function(settings, schema) {
		/*jshint maxlen:255 */
		/*eslint max-len:0 */
		var rgbRegExp = /rgb\s*$\s*([0-9]+)\s*,\s*([0-9]+)\s*,\s*([0-9]+)\s*$/gi,
			urlOrStrRegExp = /(?:url(?:(?:$\s*\"([^\"]+)\"\s*$)|(?:$\s*\'([^\']+)\'\s*$)|(?:$\s*([^)\s]+)\s*$)))|(?:\'([^\']+)\')|(?:\"([^\"]+)\")/gi,
			styleRegExp = /\s*([^:]+):\s*([^;]+);?/g,
			trimRightRegExp = /\s+$/,
			undef, i, encodingLookup = {}, encodingItems, validStyles, invalidStyles, invisibleChar = '\uFEFF';

settings = settings || {};

if (schema) {
			validStyles = schema.getValidStyles();
			invalidStyles = schema.getInvalidStyles();
		}

encodingItems = ('\\" \\\' \\; \\: ; : ' + invisibleChar).split(' ');
		for (i = 0; i < encodingItems.length; i++) {
			encodingLookup[encodingItems[i]] = invisibleChar + i;
			encodingLookup[invisibleChar + i] = encodingItems[i];
		}

function toHex(match, r, g, b) {
			function hex(val) {
				val = parseInt(val, 10).toString(16);

return val.length > 1 ? val : '0' + val; // 0 -> 00
			}

return '#' + hex(r) + hex(g) + hex(b);
		}

return {
			/**
			 * Parses the specified RGB color value and returns a hex version of that color.
			 *
			 * @method toHex
			 * @param {String} color RGB string value like rgb(1,2,3)
			 * @return {String} Hex version of that RGB value like #FF00FF.
			 */
			toHex: function(color) {
				return color.replace(rgbRegExp, toHex);
			},

/**
			 * Parses the specified style value into an object collection. This parser will also
			 * merge and remove any redundant items that browsers might have added. It will also convert non hex
			 * colors to hex values. Urls inside the styles will also be converted to absolute/relative based on settings.
			 *
			 * @method parse
			 * @param {String} css Style value to parse for example: border:1px solid red;.
			 * @return {Object} Object representation of that style like {border: '1px solid red'}
			 */
			parse: function(css) {
				var styles = {}, matches, name, value, isEncoded, urlConverter = settings.url_converter;
				var urlConverterScope = settings.url_converter_scope || this;

function compress(prefix, suffix, noJoin) {
					var top, right, bottom, left;

top = styles[prefix + '-top' + suffix];
					if (!top) {
						return;
					}

right = styles[prefix + '-right' + suffix];
					if (!right) {
						return;
					}

bottom = styles[prefix + '-bottom' + suffix];
					if (!bottom) {
						return;
					}

left = styles[prefix + '-left' + suffix];
					if (!left) {
						return;
					}

var box = [top, right, bottom, left];
					i = box.length - 1;
					while (i--) {
						if (box[i] !== box[i + 1]) {
							break;
						}
					}

if (i > -1 && noJoin) {
						return;
					}

styles[prefix + suffix] = i == -1 ? box[0] : box.join(' ');
					delete styles[prefix + '-top' + suffix];
					delete styles[prefix + '-right' + suffix];
					delete styles[prefix + '-bottom' + suffix];
					delete styles[prefix + '-left' + suffix];
				}

/**
				 * Checks if the specific style can be compressed in other words if all border-width are equal.
				 */
				function canCompress(key) {
					var value = styles[key], i;

if (!value) {
						return;
					}

value = value.split(' ');
					i = value.length;
					while (i--) {
						if (value[i] !== value[0]) {
							return false;
						}
					}

styles[key] = value[0];

return true;
				}

/**
				 * Compresses multiple styles into one style.
				 */
				function compress2(target, a, b, c) {
					if (!canCompress(a)) {
						return;
					}

if (!canCompress(b)) {
						return;
					}

if (!canCompress(c)) {
						return;
					}

// Compress
					styles[target] = styles[a] + ' ' + styles[b] + ' ' + styles[c];
					delete styles[a];
					delete styles[b];
					delete styles[c];
				}

// Encodes the specified string by replacing all \" \' ; : with _<num>
				function encode(str) {
					isEncoded = true;

return encodingLookup[str];
				}

// Decodes the specified string by replacing all _<num> with it's original value \" \' etc
				// It will also decode the \" \' if keep_slashes is set to fale or omitted
				function decode(str, keep_slashes) {
					if (isEncoded) {
						str = str.replace(/\uFEFF[0-9]/g, function(str) {
							return encodingLookup[str];
						});
					}

if (!keep_slashes) {
						str = str.replace(/\\([\'\";:])/g, "$1");
					}

return str;
				}

function processUrl(match, url, url2, url3, str, str2) {
					str = str || str2;

if (str) {
						str = decode(str);

// Force strings into single quote format
						return "'" + str.replace(/\'/g, "\\'") + "'";
					}

url = decode(url || url2 || url3);

if (!settings.allow_script_urls) {
						var scriptUrl = url.replace(/[\s\r\n]+/, '');

if (/(java|vb)script:/i.test(scriptUrl)) {
							return "";
						}

if (!settings.allow_svg_data_urls && /^data:image\/svg/i.test(scriptUrl)) {
							return "";
						}
					}

// Convert the URL to relative/absolute depending on config
					if (urlConverter) {
						url = urlConverter.call(urlConverterScope, url, 'style');
					}

// Output new URL format
					return "url('" + url.replace(/\'/g, "\\'") + "')";
				}

if (css) {
					css = css.replace(/[\u0000-\u001F]/g, '');

// Encode \" \' % and ; and : inside strings so they don't interfere with the style parsing
					css = css.replace(/\\[\"\';:\uFEFF]/g, encode).replace(/\"[^\"]+\"|\'[^\']+\'/g, function(str) {
						return str.replace(/[;:]/g, encode);
					});

// Parse styles
					while ((matches = styleRegExp.exec(css))) {
						name = matches[1].replace(trimRightRegExp, '').toLowerCase();
						value = matches[2].replace(trimRightRegExp, '');

// Decode escaped sequences like \65 -> e
						/*jshint loopfunc:true*/
						/*eslint no-loop-func:0 */
						value = value.replace(/\\[0-9a-f]+/g, function(e) {
							return String.fromCharCode(parseInt(e.substr(1), 16));
						});

if (name && value.length > 0) {
							// Don't allow behavior name or expression/comments within the values
							if (!settings.allow_script_urls && (name == "behavior" || /expression\s*\(|\/\*|\*\//.test(value))) {
								continue;
							}

// Opera will produce 700 instead of bold in their style values
							if (name === 'font-weight' && value === '700') {
								value = 'bold';
							} else if (name === 'color' || name === 'background-color') { // Lowercase colors like RED
								value = value.toLowerCase();
							}

// Convert RGB colors to HEX
							value = value.replace(rgbRegExp, toHex);

// Convert URLs and force them into url('value') format
							value = value.replace(urlOrStrRegExp, processUrl);
							styles[name] = isEncoded ? decode(value, true) : value;
						}

styleRegExp.lastIndex = matches.index + matches[0].length;
					}
					// Compress the styles to reduce it's size for example IE will expand styles
					compress("border", "", true);
					compress("border", "-width");
					compress("border", "-color");
					compress("border", "-style");
					compress("padding", "");
					compress("margin", "");
					compress2('border', 'border-width', 'border-style', 'border-color');

// Remove pointless border, IE produces these
					if (styles.border === 'medium none') {
						delete styles.border;
					}

// IE 11 will produce a border-image: none when getting the style attribute from <p style="border: 1px solid red"></p>
					// So let us assume it shouldn't be there
					if (styles['border-image'] === 'none') {
						delete styles['border-image'];
					}
				}

return styles;
			},

/**
			 * Serializes the specified style object into a string.
			 *
			 * @method serialize
			 * @param {Object} styles Object to serialize as string for example: {border: '1px solid red'}
			 * @param {String} elementName Optional element name, if specified only the styles that matches the schema will be serialized.
			 * @return {String} String representation of the style object for example: border: 1px solid red.
			 */
			serialize: function(styles, elementName) {
				var css = '', name, value;

function serializeStyles(name) {
					var styleList, i, l, value;

styleList = validStyles[name];
					if (styleList) {
						for (i = 0, l = styleList.length; i < l; i++) {
							name = styleList[i];
							value = styles[name];

if (value !== undef && value.length > 0) {
								css += (css.length > 0 ? ' ' : '') + name + ': ' + value + ';';
							}
						}
					}
				}

function isValid(name, elementName) {
					var styleMap;

styleMap = invalidStyles['*'];
					if (styleMap && styleMap[name]) {
						return false;
					}

styleMap = invalidStyles[elementName];
					if (styleMap && styleMap[name]) {
						return false;
					}

return true;
				}

// Serialize styles according to schema
				if (elementName && validStyles) {
					// Serialize global styles and element specific styles
					serializeStyles('*');
					serializeStyles(elementName);
				} else {
					// Output the styles in the order they are inside the object
					for (name in styles) {
						value = styles[name];

if (value !== undef && value.length > 0) {
							if (!invalidStyles || isValid(name, elementName)) {
								css += (css.length > 0 ? ' ' : '') + name + ': ' + value + ';';
							}
						}
					}
				}

return css;
			}
		};
	};
});

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