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The emoji feature detection that occurs on every page load by default has been broken at least since [45769], causing the feature detection to fail for browsers that in fact support emoji correctly. This has led to the `wp-emoji-release.min.js` file being loaded unnecessarily even in modern browsers, which accounts for roughly 4.7 KB of extra JavaScript on every page load. This changeset fixes the feature detection, by using the correct sequences of char codes. Props sergiomdgomes, dmsnell, peterwilsoncc. Fixes #57301. Built from https://develop.svn.wordpress.org/trunk@55241 git-svn-id: http://core.svn.wordpress.org/trunk@54774 1a063a9b-81f0-0310-95a4-ce76da25c4cd
221 lines
6.9 KiB
JavaScript
221 lines
6.9 KiB
JavaScript
/**
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* @output wp-includes/js/wp-emoji-loader.js
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*/
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( function( window, document, settings ) {
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var src, ready, ii, tests;
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// Create a canvas element for testing native browser support of emoji.
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var canvas = document.createElement( 'canvas' );
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var context = canvas.getContext && canvas.getContext( '2d' );
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/**
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* Checks if two sets of Emoji characters render the same visually.
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*
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* @since 4.9.0
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*
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* @private
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*
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* @param {string} set1 Set of Emoji to test.
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* @param {string} set2 Set of Emoji to test.
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*
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* @return {boolean} True if the two sets render the same.
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*/
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function emojiSetsRenderIdentically( set1, set2 ) {
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// Cleanup from previous test.
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context.clearRect( 0, 0, canvas.width, canvas.height );
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context.fillText( set1, 0, 0 );
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var rendered1 = canvas.toDataURL();
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// Cleanup from previous test.
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context.clearRect( 0, 0, canvas.width, canvas.height );
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context.fillText( set2, 0, 0 );
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var rendered2 = canvas.toDataURL();
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return rendered1 === rendered2;
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}
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/**
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* Determines if the browser properly renders Emoji that Twemoji can supplement.
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*
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* @since 4.2.0
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*
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* @private
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*
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* @param {string} type Whether to test for support of "flag" or "emoji".
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*
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* @return {boolean} True if the browser can render emoji, false if it cannot.
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*/
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function browserSupportsEmoji( type ) {
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var isIdentical;
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if ( ! context || ! context.fillText ) {
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return false;
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}
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/*
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* Chrome on OS X added native emoji rendering in M41. Unfortunately,
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* it doesn't work when the font is bolder than 500 weight. So, we
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* check for bold rendering support to avoid invisible emoji in Chrome.
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*/
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context.textBaseline = 'top';
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context.font = '600 32px Arial';
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switch ( type ) {
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case 'flag':
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/*
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* Test for Transgender flag compatibility. Added in Unicode 13.
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*
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* To test for support, we try to render it, and compare the rendering to how it would look if
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* the browser doesn't render it correctly (white flag emoji + transgender symbol).
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*/
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isIdentical = emojiSetsRenderIdentically(
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'\uD83C\uDFF3\uFE0F\u200D\u26A7\uFE0F', // as a zero-width joiner sequence
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'\uD83C\uDFF3\uFE0F\u200B\u26A7\uFE0F' // separated by a zero-width space
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);
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if ( isIdentical ) {
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return false;
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}
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/*
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* Test for UN flag compatibility. This is the least supported of the letter locale flags,
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* so gives us an easy test for full support.
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*
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* To test for support, we try to render it, and compare the rendering to how it would look if
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* the browser doesn't render it correctly ([U] + [N]).
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*/
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isIdentical = emojiSetsRenderIdentically(
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'\uD83C\uDDFA\uD83C\uDDF3', // as the sequence of two code points
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'\uD83C\uDDFA\u200B\uD83C\uDDF3' // as the two code points separated by a zero-width space
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);
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if ( isIdentical ) {
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return false;
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}
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/*
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* Test for English flag compatibility. England is a country in the United Kingdom, it
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* does not have a two letter locale code but rather a five letter sub-division code.
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*
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* To test for support, we try to render it, and compare the rendering to how it would look if
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* the browser doesn't render it correctly (black flag emoji + [G] + [B] + [E] + [N] + [G]).
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*/
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isIdentical = emojiSetsRenderIdentically(
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// as the flag sequence
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'\uD83C\uDFF4\uDB40\uDC67\uDB40\uDC62\uDB40\uDC65\uDB40\uDC6E\uDB40\uDC67\uDB40\uDC7F',
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// with each code point separated by a zero-width space
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'\uD83C\uDFF4\u200B\uDB40\uDC67\u200B\uDB40\uDC62\u200B\uDB40\uDC65\u200B\uDB40\uDC6E\u200B\uDB40\uDC67\u200B\uDB40\uDC7F'
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);
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return ! isIdentical;
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case 'emoji':
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/*
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* Why can't we be friends? Everyone can now shake hands in emoji, regardless of skin tone!
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*
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* To test for Emoji 14.0 support, try to render a new emoji: Handshake: Light Skin Tone, Dark Skin Tone.
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*
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* The Handshake: Light Skin Tone, Dark Skin Tone emoji is a ZWJ sequence combining 🫱 Rightwards Hand,
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* 🏻 Light Skin Tone, a Zero Width Joiner, 🫲 Leftwards Hand, and 🏿 Dark Skin Tone.
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*
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* 0x1FAF1 == Rightwards Hand
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* 0x1F3FB == Light Skin Tone
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* 0x200D == Zero-Width Joiner (ZWJ) that links the code points for the new emoji or
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* 0x200B == Zero-Width Space (ZWS) that is rendered for clients not supporting the new emoji.
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* 0x1FAF2 == Leftwards Hand
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* 0x1F3FF == Dark Skin Tone.
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*
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* When updating this test for future Emoji releases, ensure that individual emoji that make up the
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* sequence come from older emoji standards.
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*/
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isIdentical = emojiSetsRenderIdentically(
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'\uD83E\uDEF1\uD83C\uDFFB\u200D\uD83E\uDEF2\uD83C\uDFFF', // as the zero-width joiner sequence
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'\uD83E\uDEF1\uD83C\uDFFB\u200B\uD83E\uDEF2\uD83C\uDFFF' // separated by a zero-width space
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);
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return ! isIdentical;
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}
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return false;
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}
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/**
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* Adds a script to the head of the document.
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*
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* @ignore
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*
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* @since 4.2.0
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*
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* @param {Object} src The url where the script is located.
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* @return {void}
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*/
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function addScript( src ) {
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var script = document.createElement( 'script' );
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script.src = src;
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script.defer = script.type = 'text/javascript';
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document.getElementsByTagName( 'head' )[0].appendChild( script );
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}
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tests = Array( 'flag', 'emoji' );
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settings.supports = {
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everything: true,
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everythingExceptFlag: true
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};
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/*
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* Tests the browser support for flag emojis and other emojis, and adjusts the
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* support settings accordingly.
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*/
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for( ii = 0; ii < tests.length; ii++ ) {
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settings.supports[ tests[ ii ] ] = browserSupportsEmoji( tests[ ii ] );
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settings.supports.everything = settings.supports.everything && settings.supports[ tests[ ii ] ];
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if ( 'flag' !== tests[ ii ] ) {
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settings.supports.everythingExceptFlag = settings.supports.everythingExceptFlag && settings.supports[ tests[ ii ] ];
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}
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}
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settings.supports.everythingExceptFlag = settings.supports.everythingExceptFlag && ! settings.supports.flag;
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// Sets DOMReady to false and assigns a ready function to settings.
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settings.DOMReady = false;
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settings.readyCallback = function() {
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settings.DOMReady = true;
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};
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// When the browser can not render everything we need to load a polyfill.
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if ( ! settings.supports.everything ) {
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ready = function() {
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settings.readyCallback();
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};
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/*
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* Cross-browser version of adding a dom ready event.
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*/
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if ( document.addEventListener ) {
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document.addEventListener( 'DOMContentLoaded', ready, false );
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window.addEventListener( 'load', ready, false );
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} else {
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window.attachEvent( 'onload', ready );
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document.attachEvent( 'onreadystatechange', function() {
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if ( 'complete' === document.readyState ) {
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settings.readyCallback();
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}
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} );
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}
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src = settings.source || {};
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if ( src.concatemoji ) {
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addScript( src.concatemoji );
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} else if ( src.wpemoji && src.twemoji ) {
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addScript( src.twemoji );
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addScript( src.wpemoji );
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}
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}
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} )( window, document, window._wpemojiSettings );
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