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166 lines
5.1 KiB
166 lines
5.1 KiB
( function( window, document, settings ) { |
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var src, ready, ii, tests; |
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/* |
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* Create a canvas element for testing native browser support |
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* of emoji. |
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*/ |
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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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* Check if two sets of Emoji characters render the same. |
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* |
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* @param set1 array Set of Emoji characters. |
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* @param set2 array Set of Emoji characters. |
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* @returns {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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* Detect if the browser supports rendering emoji or flag emoji. Flag emoji are a single glyph |
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* made of two characters, so some browsers (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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* @param type {String} Whether to test for support of "flag" or "emoji". |
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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 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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[ 55356, 56826, 55356, 56819 ], |
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[ 55356, 56826, 8203, 55356, 56819 ] |
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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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[ 55356, 57332, 56128, 56423, 56128, 56418, 56128, 56421, 56128, 56430, 56128, 56423, 56128, 56447 ], |
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[ 55356, 57332, 8203, 56128, 56423, 8203, 56128, 56418, 8203, 56128, 56421, 8203, 56128, 56430, 8203, 56128, 56423, 8203, 56128, 56447 ] |
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); |
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return ! isIdentical; |
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case 'emoji': |
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/* |
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* She's the hero Emoji deserves, but not the one it needs right now. |
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* |
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* To test for support, try to render a new emoji (female superhero), |
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* then compare it to how it would look if the browser doesn't render it correctly |
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* (superhero + female sign). |
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*/ |
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isIdentical = emojiSetsRenderIdentically( |
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[55358, 56760, 9792, 65039], |
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[55358, 56760, 8203, 9792, 65039] |
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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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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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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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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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if ( ! settings.supports.everything ) { |
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ready = function() { |
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settings.readyCallback(); |
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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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