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wp-emoji.js (8989B)

---

 /**
  * wp-emoji.js is used to replace emoji with images in browsers when the browser
  * doesn't support emoji natively.
  *
  * @output wp-includes/js/wp-emoji.js
  */
 
 ( function( window, settings ) {
 	/**
 	 * Replaces emoji with images when browsers don't support emoji.
 	 *
 	 * @since 4.2.0
 	 * @access private
 	 *
 	 * @class
 	 *
 	 * @see  Twitter Emoji library
 	 * @link https://github.com/twitter/twemoji
 	 *
 	 * @return {Object} The wpEmoji parse and test functions.
 	 */
 	function wpEmoji() {
 		var MutationObserver = window.MutationObserver || window.WebKitMutationObserver || window.MozMutationObserver,
 
 		// Compression and maintain local scope.
 		document = window.document,
 
 		// Private.
 		twemoji, timer,
 		loaded = false,
 		count = 0,
 		ie11 = window.navigator.userAgent.indexOf( 'Trident/7.0' ) > 0;
 
 		/**
 		 * Detect if the browser supports SVG.
 		 *
 		 * @since 4.6.0
 		 * @private
 		 *
 		 * @see Modernizr
 		 * @link https://github.com/Modernizr/Modernizr/blob/master/feature-detects/svg/asimg.js
 		 *
 		 * @return {boolean} True if the browser supports svg, false if not.
 		 */
 		function browserSupportsSvgAsImage() {
 			if ( !! document.implementation.hasFeature ) {
 				return document.implementation.hasFeature( 'http://www.w3.org/TR/SVG11/feature#Image', '1.1' );
 			}
 
 			// document.implementation.hasFeature is deprecated. It can be presumed
 			// if future browsers remove it, the browser will support SVGs as images.
 			return true;
 		}
 
 		/**
 		 * Runs when the document load event is fired, so we can do our first parse of
 		 * the page.
 		 *
 		 * Listens to all the DOM mutations and checks for added nodes that contain
 		 * emoji characters and replaces those with twitter emoji images.
 		 *
 		 * @since 4.2.0
 		 * @private
 		 */
 		function load() {
 			if ( loaded ) {
 				return;
 			}
 
 			// Ensure twemoji is available on the global window before proceeding.
 			if ( typeof window.twemoji === 'undefined' ) {
 				// Break if waiting for longer than 30 seconds.
 				if ( count > 600 ) {
 					return;
 				}
 
 				// Still waiting.
 				window.clearTimeout( timer );
 				timer = window.setTimeout( load, 50 );
 				count++;
 
 				return;
 			}
 
 			twemoji = window.twemoji;
 			loaded = true;
 
 			// Initialize the mutation observer, which checks all added nodes for
 			// replaceable emoji characters.
 			if ( MutationObserver ) {
 				new MutationObserver( function( mutationRecords ) {
 					var i = mutationRecords.length,
 						addedNodes, removedNodes, ii, node;
 
 					while ( i-- ) {
 						addedNodes = mutationRecords[ i ].addedNodes;
 						removedNodes = mutationRecords[ i ].removedNodes;
 						ii = addedNodes.length;
 
 						/*
 						 * Checks if an image has been replaced by a text element
 						 * with the same text as the alternate description of the replaced image.
 						 * (presumably because the image could not be loaded).
 						 * If it is, do absolutely nothing.
 						 *
 						 * Node type 3 is a TEXT_NODE.
 						 *
 						 * @link https://developer.mozilla.org/en-US/docs/Web/API/Node/nodeType
 						 */
 						if (
 							ii === 1 && removedNodes.length === 1 &&
 							addedNodes[0].nodeType === 3 &&
 							removedNodes[0].nodeName === 'IMG' &&
 							addedNodes[0].data === removedNodes[0].alt &&
 							'load-failed' === removedNodes[0].getAttribute( 'data-error' )
 						) {
 							return;
 						}
 
 						// Loop through all the added nodes.
 						while ( ii-- ) {
 							node = addedNodes[ ii ];
 
 							// Node type 3 is a TEXT_NODE.
 							if ( node.nodeType === 3 ) {
 								if ( ! node.parentNode ) {
 									continue;
 								}
 
 								if ( ie11 ) {
 									/*
 									 * IE 11's implementation of MutationObserver is buggy.
 									 * It unnecessarily splits text nodes when it encounters a HTML
 									 * template interpolation symbol ( "{{", for example ). So, we
 									 * join the text nodes back together as a work-around.
 									 *
 									 * Node type 3 is a TEXT_NODE.
 									 */
 									while( node.nextSibling && 3 === node.nextSibling.nodeType ) {
 										node.nodeValue = node.nodeValue + node.nextSibling.nodeValue;
 										node.parentNode.removeChild( node.nextSibling );
 									}
 								}
 
 								node = node.parentNode;
 							}
 
 							/*
 							 * If the class name of a non-element node contains 'wp-exclude-emoji' ignore it.
 							 *
 							 * Node type 1 is an ELEMENT_NODE.
 							 */
 							if ( ! node || node.nodeType !== 1 ||
 								( node.className && typeof node.className === 'string' && node.className.indexOf( 'wp-exclude-emoji' ) !== -1 ) ) {
 
 								continue;
 							}
 
 							if ( test( node.textContent ) ) {
 								parse( node );
 							}
 						}
 					}
 				} ).observe( document.body, {
 					childList: true,
 					subtree: true
 				} );
 			}
 
 			parse( document.body );
 		}
 
 		/**
 		 * Tests if a text string contains emoji characters.
 		 *
 		 * @since 4.3.0
 		 *
 		 * @memberOf wp.emoji
 		 *
 		 * @param {string} text The string to test.
 		 *
 		 * @return {boolean} Whether the string contains emoji characters.
 		 */
 		function test( text ) {
 			// Single char. U+20E3 to detect keycaps. U+00A9 "copyright sign" and U+00AE "registered sign" not included.
 			var single = /[\u203C\u2049\u20E3\u2122\u2139\u2194-\u2199\u21A9\u21AA\u2300\u231A\u231B\u2328\u2388\u23CF\u23E9-\u23F3\u23F8-\u23FA\u24C2\u25AA\u25AB\u25B6\u25C0\u25FB-\u25FE\u2600-\u2604\u260E\u2611\u2614\u2615\u2618\u261D\u2620\u2622\u2623\u2626\u262A\u262E\u262F\u2638\u2639\u263A\u2648-\u2653\u2660\u2663\u2665\u2666\u2668\u267B\u267F\u2692\u2693\u2694\u2696\u2697\u2699\u269B\u269C\u26A0\u26A1\u26AA\u26AB\u26B0\u26B1\u26BD\u26BE\u26C4\u26C5\u26C8\u26CE\u26CF\u26D1\u26D3\u26D4\u26E9\u26EA\u26F0-\u26F5\u26F7-\u26FA\u26FD\u2702\u2705\u2708-\u270D\u270F\u2712\u2714\u2716\u271D\u2721\u2728\u2733\u2734\u2744\u2747\u274C\u274E\u2753\u2754\u2755\u2757\u2763\u2764\u2795\u2796\u2797\u27A1\u27B0\u27BF\u2934\u2935\u2B05\u2B06\u2B07\u2B1B\u2B1C\u2B50\u2B55\u3030\u303D\u3297\u3299]/,
 			// Surrogate pair range. Only tests for the second half.
 			pair = /[\uDC00-\uDFFF]/;
 
 			if ( text ) {
 				return  pair.test( text ) || single.test( text );
 			}
 
 			return false;
 		}
 
 		/**
 		 * Parses any emoji characters into Twemoji images.
 		 *
 		 * - When passed an element the emoji characters are replaced inline.
 		 * - When passed a string the emoji characters are replaced and the result is
 		 *   returned.
 		 *
 		 * @since 4.2.0
 		 *
 		 * @memberOf wp.emoji
 		 *
 		 * @param {HTMLElement|string} object The element or string to parse.
 		 * @param {Object}             args   Additional options for Twemoji.
 		 *
 		 * @return {HTMLElement|string} A string where all emoji are now image tags of
 		 *                              emoji. Or the element that was passed as the first argument.
 		 */
 		function parse( object, args ) {
 			var params;
 
 			/*
 			 * If the browser has full support, twemoji is not loaded or our
 			 * object is not what was expected, we do not parse anything.
 			 */
 			if ( settings.supports.everything || ! twemoji || ! object ||
 				( 'string' !== typeof object && ( ! object.childNodes || ! object.childNodes.length ) ) ) {
 
 				return object;
 			}
 
 			// Compose the params for the twitter emoji library.
 			args = args || {};
 			params = {
 				base: browserSupportsSvgAsImage() ? settings.svgUrl : settings.baseUrl,
 				ext:  browserSupportsSvgAsImage() ? settings.svgExt : settings.ext,
 				className: args.className || 'emoji',
 				callback: function( icon, options ) {
 					// Ignore some standard characters that TinyMCE recommends in its character map.
 					switch ( icon ) {
 						case 'a9':
 						case 'ae':
 						case '2122':
 						case '2194':
 						case '2660':
 						case '2663':
 						case '2665':
 						case '2666':
 							return false;
 					}
 
 					if ( settings.supports.everythingExceptFlag &&
 						! /^1f1(?:e[6-9a-f]|f[0-9a-f])-1f1(?:e[6-9a-f]|f[0-9a-f])$/.test( icon ) && // Country flags.
 						! /^(1f3f3-fe0f-200d-1f308|1f3f4-200d-2620-fe0f)$/.test( icon )             // Rainbow and pirate flags.
 					) {
 						return false;
 					}
 
 					return ''.concat( options.base, icon, options.ext );
 				},
 				attributes: function() {
 					return {
 						role: 'img'
 					};
 				},
 				onerror: function() {
 					if ( twemoji.parentNode ) {
 						this.setAttribute( 'data-error', 'load-failed' );
 						twemoji.parentNode.replaceChild( document.createTextNode( twemoji.alt ), twemoji );
 					}
 				}
 			};
 
 			if ( typeof args.imgAttr === 'object' ) {
 				params.attributes = function() {
 					return args.imgAttr;
 				};
 			}
 
 			return twemoji.parse( object, params );
 		}
 
 		/**
 		 * Initialize our emoji support, and set up listeners.
 		 */
 		if ( settings ) {
 			if ( settings.DOMReady ) {
 				load();
 			} else {
 				settings.readyCallback = load;
 			}
 		}
 
 		return {
 			parse: parse,
 			test: test
 		};
 	}
 
 	window.wp = window.wp || {};
 
 	/**
 	 * @namespace wp.emoji
 	 */
 	window.wp.emoji = new wpEmoji();
 
 } )( window, window._wpemojiSettings );