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 );
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