1/**
  2 * wp-emoji.js is used to replace emoji with images in browsers when the browser
  3 * doesn't support emoji natively.
  4 *
  5 * @output wp-includes/js/wp-emoji.js
  6 */
  7
  8( function( window, settings ) {
  9	/**
 10	 * Replaces emoji with images when browsers don't support emoji.
 11	 *
 12	 * @since 4.2.0
 13	 * @access private
 14	 *
 15	 * @class
 16	 *
 17	 * @see  Twitter Emoji library
 18	 * @link https://github.com/twitter/twemoji
 19	 *
 20	 * @return {Object} The wpEmoji parse and test functions.
 21	 */
 22	function wpEmoji() {
 23		var MutationObserver = window.MutationObserver || window.WebKitMutationObserver || window.MozMutationObserver,
 24
 25		// Compression and maintain local scope.
 26		document = window.document,
 27
 28		// Private.
 29		twemoji, timer,
 30		loaded = false,
 31		count = 0,
 32		ie11 = window.navigator.userAgent.indexOf( 'Trident/7.0' ) > 0;
 33
 34		/**
 35		 * Detect if the browser supports SVG.
 36		 *
 37		 * @since 4.6.0
 38		 * @private
 39		 *
 40		 * @see Modernizr
 41		 * @link https://github.com/Modernizr/Modernizr/blob/master/feature-detects/svg/asimg.js
 42		 *
 43		 * @return {boolean} True if the browser supports svg, false if not.
 44		 */
 45		function browserSupportsSvgAsImage() {
 46			if ( !! document.implementation.hasFeature ) {
 47				return document.implementation.hasFeature( 'http://www.w3.org/TR/SVG11/feature#Image', '1.1' );
 48			}
 49
 50			// document.implementation.hasFeature is deprecated. It can be presumed
 51			// if future browsers remove it, the browser will support SVGs as images.
 52			return true;
 53		}
 54
 55		/**
 56		 * Runs when the document load event is fired, so we can do our first parse of
 57		 * the page.
 58		 *
 59		 * Listens to all the DOM mutations and checks for added nodes that contain
 60		 * emoji characters and replaces those with twitter emoji images.
 61		 *
 62		 * @since 4.2.0
 63		 * @private
 64		 */
 65		function load() {
 66			if ( loaded ) {
 67				return;
 68			}
 69
 70			// Ensure twemoji is available on the global window before proceeding.
 71			if ( typeof window.twemoji === 'undefined' ) {
 72				// Break if waiting for longer than 30 seconds.
 73				if ( count > 600 ) {
 74					return;
 75				}
 76
 77				// Still waiting.
 78				window.clearTimeout( timer );
 79				timer = window.setTimeout( load, 50 );
 80				count++;
 81
 82				return;
 83			}
 84
 85			twemoji = window.twemoji;
 86			loaded = true;
 87
 88			// Initialize the mutation observer, which checks all added nodes for
 89			// replaceable emoji characters.
 90			if ( MutationObserver ) {
 91				new MutationObserver( function( mutationRecords ) {
 92					var i = mutationRecords.length,
 93						addedNodes, removedNodes, ii, node;
 94
 95					while ( i-- ) {
 96						addedNodes = mutationRecords[ i ].addedNodes;
 97						removedNodes = mutationRecords[ i ].removedNodes;
 98						ii = addedNodes.length;
 99
100						/*
101						 * Checks if an image has been replaced by a text element
102						 * with the same text as the alternate description of the replaced image.
103						 * (presumably because the image could not be loaded).
104						 * If it is, do absolutely nothing.
105						 *
106						 * Node type 3 is a TEXT_NODE.
107						 *
108						 * @link https://developer.mozilla.org/en-US/docs/Web/API/Node/nodeType
109						 */
110						if (
111							ii === 1 && removedNodes.length === 1 &&
112							addedNodes[0].nodeType === 3 &&
113							removedNodes[0].nodeName === 'IMG' &&
114							addedNodes[0].data === removedNodes[0].alt &&
115							'load-failed' === removedNodes[0].getAttribute( 'data-error' )
116						) {
117							return;
118						}
119
120						// Loop through all the added nodes.
121						while ( ii-- ) {
122							node = addedNodes[ ii ];
123
124							// Node type 3 is a TEXT_NODE.
125							if ( node.nodeType === 3 ) {
126								if ( ! node.parentNode ) {
127									continue;
128								}
129
130								if ( ie11 ) {
131									/*
132									 * IE 11's implementation of MutationObserver is buggy.
133									 * It unnecessarily splits text nodes when it encounters a HTML
134									 * template interpolation symbol ( "{{", for example ). So, we
135									 * join the text nodes back together as a work-around.
136									 *
137									 * Node type 3 is a TEXT_NODE.
138									 */
139									while( node.nextSibling && 3 === node.nextSibling.nodeType ) {
140										node.nodeValue = node.nodeValue + node.nextSibling.nodeValue;
141										node.parentNode.removeChild( node.nextSibling );
142									}
143								}
144
145								node = node.parentNode;
146							}
147
148							if ( test( node.textContent ) ) {
149								parse( node );
150							}
151						}
152					}
153				} ).observe( document.body, {
154					childList: true,
155					subtree: true
156				} );
157			}
158
159			parse( document.body );
160		}
161
162		/**
163		 * Tests if a text string contains emoji characters.
164		 *
165		 * @since 4.3.0
166		 *
167		 * @memberOf wp.emoji
168		 *
169		 * @param {string} text The string to test.
170		 *
171		 * @return {boolean} Whether the string contains emoji characters.
172		 */
173		function test( text ) {
174			// Single char. U+20E3 to detect keycaps. U+00A9 "copyright sign" and U+00AE "registered sign" not included.
175			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]/,
176			// Surrogate pair range. Only tests for the second half.
177			pair = /[\uDC00-\uDFFF]/;
178
179			if ( text ) {
180				return  pair.test( text ) || single.test( text );
181			}
182
183			return false;
184		}
185
186		/**
187		 * Parses any emoji characters into Twemoji images.
188		 *
189		 * - When passed an element the emoji characters are replaced inline.
190		 * - When passed a string the emoji characters are replaced and the result is
191		 *   returned.
192		 *
193		 * @since 4.2.0
194		 *
195		 * @memberOf wp.emoji
196		 *
197		 * @param {HTMLElement|string} object The element or string to parse.
198		 * @param {Object}             args   Additional options for Twemoji.
199		 *
200		 * @return {HTMLElement|string} A string where all emoji are now image tags of
201		 *                              emoji. Or the element that was passed as the first argument.
202		 */
203		function parse( object, args ) {
204			var params;
205
206			/*
207			 * If the browser has full support, twemoji is not loaded or our
208			 * object is not what was expected, we do not parse anything.
209			 */
210			if ( settings.supports.everything || ! twemoji || ! object ||
211				( 'string' !== typeof object && ( ! object.childNodes || ! object.childNodes.length ) ) ) {
212
213				return object;
214			}
215
216			// Compose the params for the twitter emoji library.
217			args = args || {};
218			params = {
219				base: browserSupportsSvgAsImage() ? settings.svgUrl : settings.baseUrl,
220				ext:  browserSupportsSvgAsImage() ? settings.svgExt : settings.ext,
221				className: args.className || 'emoji',
222				callback: function( icon, options ) {
223					// Ignore some standard characters that TinyMCE recommends in its character map.
224					switch ( icon ) {
225						case 'a9':
226						case 'ae':
227						case '2122':
228						case '2194':
229						case '2660':
230						case '2663':
231						case '2665':
232						case '2666':
233							return false;
234					}
235
236					if ( settings.supports.everythingExceptFlag &&
237						! /^1f1(?:e[6-9a-f]|f[0-9a-f])-1f1(?:e[6-9a-f]|f[0-9a-f])$/.test( icon ) && // Country flags.
238						! /^(1f3f3-fe0f-200d-1f308|1f3f4-200d-2620-fe0f)$/.test( icon )             // Rainbow and pirate flags.
239					) {
240						return false;
241					}
242
243					return ''.concat( options.base, icon, options.ext );
244				},
245				attributes: function() {
246					return {
247						role: 'img'
248					};
249				},
250				onerror: function() {
251					if ( twemoji.parentNode ) {
252						this.setAttribute( 'data-error', 'load-failed' );
253						twemoji.parentNode.replaceChild( document.createTextNode( twemoji.alt ), twemoji );
254					}
255				},
256				doNotParse: function( node ) {
257					if (
258						node &&
259						node.className &&
260						typeof node.className === 'string' &&
261						node.className.indexOf( 'wp-exclude-emoji' ) !== -1
262					) {
263						// Do not parse this node. Emojis will not be replaced in this node and all sub-nodes.
264						return true;
265					}
266
267					return false;
268				}
269			};
270
271			if ( typeof args.imgAttr === 'object' ) {
272				params.attributes = function() {
273					return args.imgAttr;
274				};
275			}
276
277			return twemoji.parse( object, params );
278		}
279
280		load();
281
282		return {
283			parse: parse,
284			test: test
285		};
286	}
287
288	window.wp = window.wp || {};
289
290	/**
291	 * @namespace wp.emoji
292	 */
293	window.wp.emoji = new wpEmoji();
294
295} )( window, window._wpemojiSettings );
296