222 lines
6.8 KiB
JavaScript
222 lines
6.8 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 {number[]} set1 Set of Emoji character codes.
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* @param {number[]} set2 Set of Emoji character codes.
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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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var stringFromCharCode = String.fromCharCode;
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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( stringFromCharCode.apply( this, 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( stringFromCharCode.apply( this, 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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* Detects if the browser supports rendering emoji or flag emoji.
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*
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* Flag emoji are a single glyph made of two characters, so some browsers
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* (notably, Firefox OS X) don't support them.
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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. This flag is shortlisted for the Emoji 13 spec,
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* but has landed in Twemoji early, so we can add support for it, too.
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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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[ 0x1F3F3, 0xFE0F, 0x200D, 0x26A7, 0xFE0F ],
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[ 0x1F3F3, 0xFE0F, 0x200B, 0x26A7, 0xFE0F ]
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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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[ 0xD83C, 0xDDFA, 0xD83C, 0xDDF3 ],
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[ 0xD83C, 0xDDFA, 0x200B, 0xD83C, 0xDDF3 ]
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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 an 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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[ 0xD83C, 0xDFF4, 0xDB40, 0xDC67, 0xDB40, 0xDC62, 0xDB40, 0xDC65, 0xDB40, 0xDC6E, 0xDB40, 0xDC67, 0xDB40, 0xDC7F ],
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[ 0xD83C, 0xDFF4, 0x200B, 0xDB40, 0xDC67, 0x200B, 0xDB40, 0xDC62, 0x200B, 0xDB40, 0xDC65, 0x200B, 0xDB40, 0xDC6E, 0x200B, 0xDB40, 0xDC67, 0x200B, 0xDB40, 0xDC7F ]
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);
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return ! isIdentical;
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case 'emoji':
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/*
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* So easy, even a baby could do it!
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*
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* To test for Emoji 13 support, try to render a new emoji: Man Feeding Baby.
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*
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* The Man Feeding Baby emoji is a ZWJ sequence combining 👨 Man, a Zero Width Joiner and 🍼 Baby Bottle.
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*
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* 0xD83D, 0xDC68 == Man emoji.
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* 0x200D == Zero-Width Joiner (ZWJ) that links the two 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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* 0xD83C, 0xDF7C == Baby Bottle.
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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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[0xD83D, 0xDC68, 0x200D, 0xD83C, 0xDF7C],
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[0xD83D, 0xDC68, 0x200B, 0xD83C, 0xDF7C]
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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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