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215 lines
6.5 KiB
215 lines
6.5 KiB
/** |
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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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* Love is love. |
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* |
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* To test for Emoji 12 support, try to render a new emoji: men holding hands, with different skin |
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* tone modifiers. |
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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, 0xD83C, 0xDFFE, 0x200D, 0xD83E, 0xDD1D, 0x200D, 0xD83D, 0xDC68, 0xD83C, 0xDFFC], |
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[0xD83D, 0xDC68, 0xD83C, 0xDFFE, 0x200B, 0xD83E, 0xDD1D, 0x200B, 0xD83D, 0xDC68, 0xD83C, 0xDFFC] |
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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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