225 lines
7.0 KiB
JavaScript
Executable File
225 lines
7.0 KiB
JavaScript
Executable File
/**
|
|
* @output wp-includes/js/wp-emoji-loader.js
|
|
*/
|
|
|
|
( function( window, document, settings ) {
|
|
var src, ready, ii, tests;
|
|
|
|
// Create a canvas element for testing native browser support of emoji.
|
|
var canvas = document.createElement( 'canvas' );
|
|
var context = canvas.getContext && canvas.getContext( '2d' );
|
|
|
|
/**
|
|
* Checks if two sets of Emoji characters render the same visually.
|
|
*
|
|
* @since 4.9.0
|
|
*
|
|
* @private
|
|
*
|
|
* @param {number[]} set1 Set of Emoji character codes.
|
|
* @param {number[]} set2 Set of Emoji character codes.
|
|
*
|
|
* @return {boolean} True if the two sets render the same.
|
|
*/
|
|
function emojiSetsRenderIdentically( set1, set2 ) {
|
|
var stringFromCharCode = String.fromCharCode;
|
|
|
|
// Cleanup from previous test.
|
|
context.clearRect( 0, 0, canvas.width, canvas.height );
|
|
context.fillText( stringFromCharCode.apply( this, set1 ), 0, 0 );
|
|
var rendered1 = canvas.toDataURL();
|
|
|
|
// Cleanup from previous test.
|
|
context.clearRect( 0, 0, canvas.width, canvas.height );
|
|
context.fillText( stringFromCharCode.apply( this, set2 ), 0, 0 );
|
|
var rendered2 = canvas.toDataURL();
|
|
|
|
return rendered1 === rendered2;
|
|
}
|
|
|
|
/**
|
|
* Detects if the browser supports rendering emoji or flag emoji.
|
|
*
|
|
* Flag emoji are a single glyph made of two characters, so some browsers
|
|
* (notably, Firefox OS X) don't support them.
|
|
*
|
|
* @since 4.2.0
|
|
*
|
|
* @private
|
|
*
|
|
* @param {string} type Whether to test for support of "flag" or "emoji".
|
|
*
|
|
* @return {boolean} True if the browser can render emoji, false if it cannot.
|
|
*/
|
|
function browserSupportsEmoji( type ) {
|
|
var isIdentical;
|
|
|
|
if ( ! context || ! context.fillText ) {
|
|
return false;
|
|
}
|
|
|
|
/*
|
|
* Chrome on OS X added native emoji rendering in M41. Unfortunately,
|
|
* it doesn't work when the font is bolder than 500 weight. So, we
|
|
* check for bold rendering support to avoid invisible emoji in Chrome.
|
|
*/
|
|
context.textBaseline = 'top';
|
|
context.font = '600 32px Arial';
|
|
|
|
switch ( type ) {
|
|
case 'flag':
|
|
/*
|
|
* Test for Transgender flag compatibility. This flag is shortlisted for the Emoji 13 spec,
|
|
* but has landed in Twemoji early, so we can add support for it, too.
|
|
*
|
|
* To test for support, we try to render it, and compare the rendering to how it would look if
|
|
* the browser doesn't render it correctly (white flag emoji + transgender symbol).
|
|
*/
|
|
isIdentical = emojiSetsRenderIdentically(
|
|
[ 0x1F3F3, 0xFE0F, 0x200D, 0x26A7, 0xFE0F ],
|
|
[ 0x1F3F3, 0xFE0F, 0x200B, 0x26A7, 0xFE0F ]
|
|
);
|
|
|
|
if ( isIdentical ) {
|
|
return false;
|
|
}
|
|
|
|
/*
|
|
* Test for UN flag compatibility. This is the least supported of the letter locale flags,
|
|
* so gives us an easy test for full support.
|
|
*
|
|
* To test for support, we try to render it, and compare the rendering to how it would look if
|
|
* the browser doesn't render it correctly ([U] + [N]).
|
|
*/
|
|
isIdentical = emojiSetsRenderIdentically(
|
|
[ 0xD83C, 0xDDFA, 0xD83C, 0xDDF3 ],
|
|
[ 0xD83C, 0xDDFA, 0x200B, 0xD83C, 0xDDF3 ]
|
|
);
|
|
|
|
if ( isIdentical ) {
|
|
return false;
|
|
}
|
|
|
|
/*
|
|
* Test for English flag compatibility. England is a country in the United Kingdom, it
|
|
* does not have a two letter locale code but rather an five letter sub-division code.
|
|
*
|
|
* To test for support, we try to render it, and compare the rendering to how it would look if
|
|
* the browser doesn't render it correctly (black flag emoji + [G] + [B] + [E] + [N] + [G]).
|
|
*/
|
|
isIdentical = emojiSetsRenderIdentically(
|
|
[ 0xD83C, 0xDFF4, 0xDB40, 0xDC67, 0xDB40, 0xDC62, 0xDB40, 0xDC65, 0xDB40, 0xDC6E, 0xDB40, 0xDC67, 0xDB40, 0xDC7F ],
|
|
[ 0xD83C, 0xDFF4, 0x200B, 0xDB40, 0xDC67, 0x200B, 0xDB40, 0xDC62, 0x200B, 0xDB40, 0xDC65, 0x200B, 0xDB40, 0xDC6E, 0x200B, 0xDB40, 0xDC67, 0x200B, 0xDB40, 0xDC7F ]
|
|
);
|
|
|
|
return ! isIdentical;
|
|
case 'emoji':
|
|
/*
|
|
* Why can't we be friends? Everyone can now shake hands in emoji, regardless of skin tone!
|
|
*
|
|
* To test for Emoji 14.0 support, try to render a new emoji: Handshake: Light Skin Tone, Dark Skin Tone.
|
|
*
|
|
* The Handshake: Light Skin Tone, Dark Skin Tone emoji is a ZWJ sequence combining 🫱 Rightwards Hand,
|
|
* 🏻 Light Skin Tone, a Zero Width Joiner, 🫲 Leftwards Hand, and 🏿 Dark Skin Tone.
|
|
*
|
|
* 0x1FAF1 == Rightwards Hand
|
|
* 0x1F3FB == Light Skin Tone
|
|
* 0x200D == Zero-Width Joiner (ZWJ) that links the code points for the new emoji or
|
|
* 0x200B == Zero-Width Space (ZWS) that is rendered for clients not supporting the new emoji.
|
|
* 0x1FAF2 == Leftwards Hand
|
|
* 0x1F3FF == Dark Skin Tone.
|
|
*
|
|
* When updating this test for future Emoji releases, ensure that individual emoji that make up the
|
|
* sequence come from older emoji standards.
|
|
*/
|
|
isIdentical = emojiSetsRenderIdentically(
|
|
[0x1FAF1, 0x1F3FB, 0x200D, 0x1FAF2, 0x1F3FF],
|
|
[0x1FAF1, 0x1F3FB, 0x200B, 0x1FAF2, 0x1F3FF]
|
|
);
|
|
|
|
return ! isIdentical;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* Adds a script to the head of the document.
|
|
*
|
|
* @ignore
|
|
*
|
|
* @since 4.2.0
|
|
*
|
|
* @param {Object} src The url where the script is located.
|
|
* @return {void}
|
|
*/
|
|
function addScript( src ) {
|
|
var script = document.createElement( 'script' );
|
|
|
|
script.src = src;
|
|
script.defer = script.type = 'text/javascript';
|
|
document.getElementsByTagName( 'head' )[0].appendChild( script );
|
|
}
|
|
|
|
tests = Array( 'flag', 'emoji' );
|
|
|
|
settings.supports = {
|
|
everything: true,
|
|
everythingExceptFlag: true
|
|
};
|
|
|
|
/*
|
|
* Tests the browser support for flag emojis and other emojis, and adjusts the
|
|
* support settings accordingly.
|
|
*/
|
|
for( ii = 0; ii < tests.length; ii++ ) {
|
|
settings.supports[ tests[ ii ] ] = browserSupportsEmoji( tests[ ii ] );
|
|
|
|
settings.supports.everything = settings.supports.everything && settings.supports[ tests[ ii ] ];
|
|
|
|
if ( 'flag' !== tests[ ii ] ) {
|
|
settings.supports.everythingExceptFlag = settings.supports.everythingExceptFlag && settings.supports[ tests[ ii ] ];
|
|
}
|
|
}
|
|
|
|
settings.supports.everythingExceptFlag = settings.supports.everythingExceptFlag && ! settings.supports.flag;
|
|
|
|
// Sets DOMReady to false and assigns a ready function to settings.
|
|
settings.DOMReady = false;
|
|
settings.readyCallback = function() {
|
|
settings.DOMReady = true;
|
|
};
|
|
|
|
// When the browser can not render everything we need to load a polyfill.
|
|
if ( ! settings.supports.everything ) {
|
|
ready = function() {
|
|
settings.readyCallback();
|
|
};
|
|
|
|
/*
|
|
* Cross-browser version of adding a dom ready event.
|
|
*/
|
|
if ( document.addEventListener ) {
|
|
document.addEventListener( 'DOMContentLoaded', ready, false );
|
|
window.addEventListener( 'load', ready, false );
|
|
} else {
|
|
window.attachEvent( 'onload', ready );
|
|
document.attachEvent( 'onreadystatechange', function() {
|
|
if ( 'complete' === document.readyState ) {
|
|
settings.readyCallback();
|
|
}
|
|
} );
|
|
}
|
|
|
|
src = settings.source || {};
|
|
|
|
if ( src.concatemoji ) {
|
|
addScript( src.concatemoji );
|
|
} else if ( src.wpemoji && src.twemoji ) {
|
|
addScript( src.twemoji );
|
|
addScript( src.wpemoji );
|
|
}
|
|
}
|
|
|
|
} )( window, document, window._wpemojiSettings );
|