305 lines
8.8 KiB
JavaScript
305 lines
8.8 KiB
JavaScript
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/**
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* wp-emoji.js is used to replace emoji with images in browsers when the browser
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* doesn't support emoji natively.
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*
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* @output wp-includes/js/wp-emoji.js
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*/
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( function( window, settings ) {
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/**
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* Replaces emoji with images when browsers don't support emoji.
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*
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* @since 4.2.0
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* @access private
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*
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* @class
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*
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* @see Twitter Emoji library
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* @link https://github.com/twitter/twemoji
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*
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* @return {Object} The wpEmoji parse and test functions.
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*/
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function wpEmoji() {
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var MutationObserver = window.MutationObserver || window.WebKitMutationObserver || window.MozMutationObserver,
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// Compression and maintain local scope.
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document = window.document,
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// Private.
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twemoji, timer,
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loaded = false,
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count = 0,
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ie11 = window.navigator.userAgent.indexOf( 'Trident/7.0' ) > 0;
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/**
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* Detect if the browser supports SVG.
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*
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* @since 4.6.0
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* @private
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*
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* @see Modernizr
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* @link https://github.com/Modernizr/Modernizr/blob/master/feature-detects/svg/asimg.js
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*
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* @return {boolean} True if the browser supports svg, false if not.
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*/
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function browserSupportsSvgAsImage() {
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if ( !! document.implementation.hasFeature ) {
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return document.implementation.hasFeature( 'http://www.w3.org/TR/SVG11/feature#Image', '1.1' );
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}
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// document.implementation.hasFeature is deprecated. It can be presumed
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// if future browsers remove it, the browser will support SVGs as images.
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return true;
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}
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/**
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* Runs when the document load event is fired, so we can do our first parse of
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* the page.
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*
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* Listens to all the DOM mutations and checks for added nodes that contain
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* emoji characters and replaces those with twitter emoji images.
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*
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* @since 4.2.0
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* @private
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*/
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function load() {
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if ( loaded ) {
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return;
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}
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// Ensure twemoji is available on the global window before proceeding.
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if ( typeof window.twemoji === 'undefined' ) {
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// Break if waiting for longer than 30 seconds.
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if ( count > 600 ) {
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return;
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}
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// Still waiting.
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window.clearTimeout( timer );
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timer = window.setTimeout( load, 50 );
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count++;
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return;
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}
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twemoji = window.twemoji;
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loaded = true;
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// Initialize the mutation observer, which checks all added nodes for
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// replaceable emoji characters.
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if ( MutationObserver ) {
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new MutationObserver( function( mutationRecords ) {
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var i = mutationRecords.length,
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addedNodes, removedNodes, ii, node;
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while ( i-- ) {
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addedNodes = mutationRecords[ i ].addedNodes;
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removedNodes = mutationRecords[ i ].removedNodes;
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ii = addedNodes.length;
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/*
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* Checks if an image has been replaced by a text element
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* with the same text as the alternate description of the replaced image.
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* (presumably because the image could not be loaded).
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* If it is, do absolutely nothing.
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*
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* Node type 3 is a TEXT_NODE.
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*
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* @link https://developer.mozilla.org/en-US/docs/Web/API/Node/nodeType
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*/
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if (
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ii === 1 && removedNodes.length === 1 &&
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addedNodes[0].nodeType === 3 &&
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removedNodes[0].nodeName === 'IMG' &&
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addedNodes[0].data === removedNodes[0].alt &&
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'load-failed' === removedNodes[0].getAttribute( 'data-error' )
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) {
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return;
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}
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// Loop through all the added nodes.
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while ( ii-- ) {
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node = addedNodes[ ii ];
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// Node type 3 is a TEXT_NODE.
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if ( node.nodeType === 3 ) {
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if ( ! node.parentNode ) {
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continue;
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}
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if ( ie11 ) {
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/*
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* IE 11's implementation of MutationObserver is buggy.
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* It unnecessarily splits text nodes when it encounters a HTML
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* template interpolation symbol ( "{{", for example ). So, we
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* join the text nodes back together as a work-around.
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*
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* Node type 3 is a TEXT_NODE.
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*/
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while( node.nextSibling && 3 === node.nextSibling.nodeType ) {
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node.nodeValue = node.nodeValue + node.nextSibling.nodeValue;
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node.parentNode.removeChild( node.nextSibling );
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}
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}
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node = node.parentNode;
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}
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if ( test( node.textContent ) ) {
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parse( node );
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}
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}
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}
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} ).observe( document.body, {
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childList: true,
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subtree: true
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} );
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}
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parse( document.body );
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}
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/**
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* Tests if a text string contains emoji characters.
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*
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* @since 4.3.0
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*
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* @memberOf wp.emoji
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*
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* @param {string} text The string to test.
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*
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* @return {boolean} Whether the string contains emoji characters.
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*/
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function test( text ) {
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// Single char. U+20E3 to detect keycaps. U+00A9 "copyright sign" and U+00AE "registered sign" not included.
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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]/,
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// Surrogate pair range. Only tests for the second half.
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pair = /[\uDC00-\uDFFF]/;
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if ( text ) {
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return pair.test( text ) || single.test( text );
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}
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return false;
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}
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/**
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* Parses any emoji characters into Twemoji images.
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*
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* - When passed an element the emoji characters are replaced inline.
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* - When passed a string the emoji characters are replaced and the result is
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* returned.
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*
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* @since 4.2.0
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*
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* @memberOf wp.emoji
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*
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* @param {HTMLElement|string} object The element or string to parse.
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* @param {Object} args Additional options for Twemoji.
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*
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* @return {HTMLElement|string} A string where all emoji are now image tags of
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* emoji. Or the element that was passed as the first argument.
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*/
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function parse( object, args ) {
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var params;
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/*
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* If the browser has full support, twemoji is not loaded or our
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* object is not what was expected, we do not parse anything.
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*/
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if ( settings.supports.everything || ! twemoji || ! object ||
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( 'string' !== typeof object && ( ! object.childNodes || ! object.childNodes.length ) ) ) {
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return object;
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}
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// Compose the params for the twitter emoji library.
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args = args || {};
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params = {
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base: browserSupportsSvgAsImage() ? settings.svgUrl : settings.baseUrl,
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ext: browserSupportsSvgAsImage() ? settings.svgExt : settings.ext,
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className: args.className || 'emoji',
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callback: function( icon, options ) {
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// Ignore some standard characters that TinyMCE recommends in its character map.
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switch ( icon ) {
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case 'a9':
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case 'ae':
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case '2122':
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case '2194':
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case '2660':
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case '2663':
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case '2665':
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case '2666':
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return false;
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}
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if ( settings.supports.everythingExceptFlag &&
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! /^1f1(?:e[6-9a-f]|f[0-9a-f])-1f1(?:e[6-9a-f]|f[0-9a-f])$/.test( icon ) && // Country flags.
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! /^(1f3f3-fe0f-200d-1f308|1f3f4-200d-2620-fe0f)$/.test( icon ) // Rainbow and pirate flags.
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) {
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return false;
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}
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return ''.concat( options.base, icon, options.ext );
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},
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attributes: function() {
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return {
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role: 'img'
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};
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},
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onerror: function() {
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if ( twemoji.parentNode ) {
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this.setAttribute( 'data-error', 'load-failed' );
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twemoji.parentNode.replaceChild( document.createTextNode( twemoji.alt ), twemoji );
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}
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},
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doNotParse: function( node ) {
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if (
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node &&
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node.className &&
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typeof node.className === 'string' &&
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node.className.indexOf( 'wp-exclude-emoji' ) !== -1
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) {
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// Do not parse this node. Emojis will not be replaced in this node and all sub-nodes.
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return true;
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}
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return false;
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}
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};
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if ( typeof args.imgAttr === 'object' ) {
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params.attributes = function() {
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return args.imgAttr;
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};
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}
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return twemoji.parse( object, params );
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}
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/**
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* Initialize our emoji support, and set up listeners.
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*/
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if ( settings ) {
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if ( settings.DOMReady ) {
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load();
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} else {
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settings.readyCallback = load;
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}
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}
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return {
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parse: parse,
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test: test
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};
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}
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window.wp = window.wp || {};
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/**
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* @namespace wp.emoji
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*/
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window.wp.emoji = new wpEmoji();
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} )( window, window._wpemojiSettings );
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