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Emoji: Optimize emoji loader with sessionStorage, willReadFrequently, and OffscreenCanvas.
* Use `sessionStorage` to remember the previous results of calls to `browserSupportsEmoji()` for 1 week. * Optimize reading from canvas by supplying the `willReadFrequently` option for the 2D context. * When `OffscreenCanvas` is available, offload `browserSupportsEmoji()` to a web worker to prevent blocking the main thread. This is of primary benefit to Safari which does not yet support `willReadFrequently`. * Remove obsolete support for IE11 since promises are now utilized. Nevertheless, ES3 syntax is maintained and IE11 will simply short-circuit. Props westonruter, dmsnell, peterwilsoncc, valterlorran, flixos90, spacedmonkey, joemcgill. Fixes #58472. Built from https://develop.svn.wordpress.org/trunk@56074 git-svn-id: http://core.svn.wordpress.org/trunk@55586 1a063a9b-81f0-0310-95a4-ce76da25c4cd
This commit is contained in:
Weston Ruter
parent
1afbc5b8a7
commit
80abb55903
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@ -2,65 +2,189 @@
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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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/**
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* Emoji Settings as exported in PHP via _print_emoji_detection_script().
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* @typedef WPEmojiSettings
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* @type {object}
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* @property {?object} source
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* @property {?string} source.concatemoji
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* @property {?string} source.twemoji
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* @property {?string} source.wpemoji
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* @property {?boolean} DOMReady
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* @property {?Function} readyCallback
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*/
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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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* Support tests.
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* @typedef SupportTests
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* @type {object}
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* @property {?boolean} flag
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* @property {?boolean} emoji
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*/
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/**
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* IIFE to detect emoji support and load Twemoji if needed.
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*
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* @param {Window} window
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* @param {Document} document
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* @param {WPEmojiSettings} settings
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*/
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( function wpEmojiLoader( window, document, settings ) {
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if ( typeof Promise === 'undefined' ) {
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return;
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}
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var sessionStorageKey = 'wpEmojiSettingsSupports';
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var tests = [ 'flag', 'emoji' ];
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/**
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* Checks whether the browser supports offloading to a Worker.
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*
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* @since 6.3.0
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*
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* @private
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*
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* @returns {boolean}
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*/
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function supportsWorkerOffloading() {
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return (
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typeof Worker !== 'undefined' &&
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typeof OffscreenCanvas !== 'undefined' &&
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typeof URL !== 'undefined' &&
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URL.createObjectURL &&
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typeof Blob !== 'undefined'
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);
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}
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/**
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* @typedef SessionSupportTests
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* @type {object}
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* @property {number} timestamp
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* @property {SupportTests} supportTests
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*/
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/**
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* Get support tests from session.
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*
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* @since 6.3.0
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*
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* @private
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*
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* @returns {?SupportTests} Support tests, or null if not set or older than 1 week.
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*/
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function getSessionSupportTests() {
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if (
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typeof sessionStorage !== 'undefined' &&
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sessionStorageKey in sessionStorage
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) {
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try {
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/** @type {SessionSupportTests} */
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var item = JSON.parse(
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sessionStorage.getItem( sessionStorageKey )
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);
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if (
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typeof item === 'object' &&
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typeof item.timestamp === 'number' &&
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new Date().valueOf() < item.timestamp + 604800 && // Note: Number is a week in seconds.
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typeof item.supportTests === 'object'
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) {
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return item.supportTests;
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}
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} catch ( e ) {}
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}
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return null;
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}
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/**
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* Persist the supports in session storage.
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*
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* @since 6.3.0
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*
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* @private
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*
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* @param {SupportTests} supportTests Support tests.
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*/
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function setSessionSupportTests( supportTests ) {
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if ( typeof sessionStorage !== 'undefined' ) {
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try {
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/** @type {SessionSupportTests} */
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var item = {
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supportTests: supportTests,
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timestamp: new Date().valueOf()
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};
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sessionStorage.setItem(
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sessionStorageKey,
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JSON.stringify( item )
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);
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} catch ( e ) {}
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}
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}
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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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* This function may be serialized to run in a Worker. Therefore, it cannot refer to variables from the containing
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* scope. Everything must be passed by parameters.
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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 {CanvasRenderingContext2D} context 2D Context.
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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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function emojiSetsRenderIdentically( context, 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.clearRect( 0, 0, context.canvas.width, context.canvas.height );
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context.fillText( set1, 0, 0 );
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var rendered1 = canvas.toDataURL();
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var rendered1 = new Uint32Array(
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context.getImageData(
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0,
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0,
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context.canvas.width,
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context.canvas.height
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).data
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);
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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.clearRect( 0, 0, context.canvas.width, context.canvas.height );
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context.fillText( set2, 0, 0 );
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var rendered2 = canvas.toDataURL();
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var rendered2 = new Uint32Array(
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context.getImageData(
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0,
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0,
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context.canvas.width,
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context.canvas.height
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).data
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);
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return rendered1 === rendered2;
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return rendered1.every( function ( rendered2Data, index ) {
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return rendered2Data === rendered2[ index ];
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} );
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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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* This function may be serialized to run in a Worker. Therefore, it cannot refer to variables from the containing
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* scope. Everything must be passed by parameters.
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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 {CanvasRenderingContext2D} context 2D Context.
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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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function browserSupportsEmoji( context, 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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* 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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context,
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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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'\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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@ -86,8 +211,9 @@
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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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context,
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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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* 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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context,
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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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* sequence come from older emoji standards.
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*/
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isIdentical = emojiSetsRenderIdentically(
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context,
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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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'\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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return false;
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}
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/**
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* Checks emoji support tests.
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*
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* This function may be serialized to run in a Worker. Therefore, it cannot refer to variables from the containing
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* scope. Everything must be passed by parameters.
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*
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* @since 6.3.0
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*
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* @private
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*
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* @param {string[]} tests Tests.
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*
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* @return {SupportTests} Support tests.
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*/
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function testEmojiSupports( tests ) {
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var canvas;
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if (
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typeof WorkerGlobalScope !== 'undefined' &&
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self instanceof WorkerGlobalScope
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) {
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canvas = new OffscreenCanvas( 300, 150 ); // Dimensions are default for HTMLCanvasElement.
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} else {
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canvas = document.createElement( 'canvas' );
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}
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var context = canvas.getContext( '2d', { willReadFrequently: true } );
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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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var supports = {};
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tests.forEach( function ( test ) {
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supports[ test ] = browserSupportsEmoji( context, test );
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} );
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return supports;
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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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*
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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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* @param {string} src The url where the script is located.
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*
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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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script.defer = true;
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document.head.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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// Create a promise for DOMContentLoaded since the worker logic may finish after the event has fired.
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var domReadyPromise = new Promise( function ( resolve ) {
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document.addEventListener( 'DOMContentLoaded', resolve, {
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once: true
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} );
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} );
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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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// Obtain the emoji support from the browser, asynchronously when possible.
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new Promise( function ( resolve ) {
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var supportTests = getSessionSupportTests();
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if ( supportTests ) {
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resolve( supportTests );
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return;
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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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if ( supportsWorkerOffloading() ) {
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try {
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/*
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* Note that this string contains the real source code for the
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* copied functions, _not_ a string representation of them. This
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* is because it's not possible to transfer a Function across
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* threads. The lack of quotes is intentional. The function names
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* are copied to variable names since minification will munge the
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* function names, thus breaking the ability for the functions to
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* refer to each other.
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*/
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var workerScript =
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'var emojiSetsRenderIdentically = ' + emojiSetsRenderIdentically + ';' +
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'var browserSupportsEmoji = ' + browserSupportsEmoji + ';' +
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'var testEmojiSupports = ' + testEmojiSupports + ';' +
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'postMessage(testEmojiSupports(' + JSON.stringify(tests) + '));';
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var blob = new Blob( [ workerScript ], {
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type: 'text/javascript'
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} );
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var worker = new Worker( URL.createObjectURL( blob ) );
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worker.onmessage = function ( event ) {
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supportTests = event.data;
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setSessionSupportTests( supportTests );
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resolve( supportTests );
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};
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return;
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} catch ( e ) {}
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}
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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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supportTests = testEmojiSupports( tests );
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setSessionSupportTests( supportTests );
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resolve( supportTests );
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} )
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// Once the browser emoji support has been obtained from the session, finalize the settings.
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.then( function ( supportTests ) {
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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 ( var test in supportTests ) {
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settings.supports[ test ] = supportTests[ test ];
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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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settings.supports.everything =
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settings.supports.everything && settings.supports[ test ];
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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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if ( 'flag' !== test ) {
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settings.supports.everythingExceptFlag =
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settings.supports.everythingExceptFlag &&
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settings.supports[ test ];
|
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}
|
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} );
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}
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}
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src = settings.source || {};
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settings.supports.everythingExceptFlag =
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settings.supports.everythingExceptFlag &&
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! settings.supports.flag;
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|
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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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// 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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} )
|
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.then( function () {
|
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return domReadyPromise;
|
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} )
|
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.then( function () {
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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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settings.readyCallback();
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var src = settings.source || {};
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|
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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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} );
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} )( window, document, window._wpemojiSettings );
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|
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2
wp-includes/js/wp-emoji-loader.min.js
vendored
2
wp-includes/js/wp-emoji-loader.min.js
vendored
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@ -1,2 +1,2 @@
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/*! This file is auto-generated */
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!function(e,a,t){var n,r,o,i=a.createElement("canvas"),p=i.getContext&&i.getContext("2d");function s(e,t){p.clearRect(0,0,i.width,i.height),p.fillText(e,0,0);e=i.toDataURL();return p.clearRect(0,0,i.width,i.height),p.fillText(t,0,0),e===i.toDataURL()}function c(e){var t=a.createElement("script");t.src=e,t.defer=t.type="text/javascript",a.getElementsByTagName("head")[0].appendChild(t)}for(o=Array("flag","emoji"),t.supports={everything:!0,everythingExceptFlag:!0},r=0;r<o.length;r++)t.supports[o[r]]=function(e){if(p&&p.fillText)switch(p.textBaseline="top",p.font="600 32px Arial",e){case"flag":return s("\ud83c\udff3\ufe0f\u200d\u26a7\ufe0f","\ud83c\udff3\ufe0f\u200b\u26a7\ufe0f")?!1:!s("\ud83c\uddfa\ud83c\uddf3","\ud83c\uddfa\u200b\ud83c\uddf3")&&!s("\ud83c\udff4\udb40\udc67\udb40\udc62\udb40\udc65\udb40\udc6e\udb40\udc67\udb40\udc7f","\ud83c\udff4\u200b\udb40\udc67\u200b\udb40\udc62\u200b\udb40\udc65\u200b\udb40\udc6e\u200b\udb40\udc67\u200b\udb40\udc7f");case"emoji":return!s("\ud83e\udef1\ud83c\udffb\u200d\ud83e\udef2\ud83c\udfff","\ud83e\udef1\ud83c\udffb\u200b\ud83e\udef2\ud83c\udfff")}return!1}(o[r]),t.supports.everything=t.supports.everything&&t.supports[o[r]],"flag"!==o[r]&&(t.supports.everythingExceptFlag=t.supports.everythingExceptFlag&&t.supports[o[r]]);t.supports.everythingExceptFlag=t.supports.everythingExceptFlag&&!t.supports.flag,t.DOMReady=!1,t.readyCallback=function(){t.DOMReady=!0},t.supports.everything||(n=function(){t.readyCallback()},a.addEventListener?(a.addEventListener("DOMContentLoaded",n,!1),e.addEventListener("load",n,!1)):(e.attachEvent("onload",n),a.attachEvent("onreadystatechange",function(){"complete"===a.readyState&&t.readyCallback()})),(e=t.source||{}).concatemoji?c(e.concatemoji):e.wpemoji&&e.twemoji&&(c(e.twemoji),c(e.wpemoji)))}(window,document,window._wpemojiSettings);
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!function(a,n){var o,s,e;function i(e){if("undefined"!=typeof sessionStorage)try{var t={supportTests:e,timestamp:(new Date).valueOf()};sessionStorage.setItem(o,JSON.stringify(t))}catch(e){}}function p(e,t,n){e.clearRect(0,0,e.canvas.width,e.canvas.height),e.fillText(t,0,0);var t=new Uint32Array(e.getImageData(0,0,e.canvas.width,e.canvas.height).data),r=(e.clearRect(0,0,e.canvas.width,e.canvas.height),e.fillText(n,0,0),new Uint32Array(e.getImageData(0,0,e.canvas.width,e.canvas.height).data));return t.every(function(e,t){return e===r[t]})}function c(e,t){switch(t){case"flag":return p(e,"\ud83c\udff3\ufe0f\u200d\u26a7\ufe0f","\ud83c\udff3\ufe0f\u200b\u26a7\ufe0f")?!1:!p(e,"\ud83c\uddfa\ud83c\uddf3","\ud83c\uddfa\u200b\ud83c\uddf3")&&!p(e,"\ud83c\udff4\udb40\udc67\udb40\udc62\udb40\udc65\udb40\udc6e\udb40\udc67\udb40\udc7f","\ud83c\udff4\u200b\udb40\udc67\u200b\udb40\udc62\u200b\udb40\udc65\u200b\udb40\udc6e\u200b\udb40\udc67\u200b\udb40\udc7f");case"emoji":return!p(e,"\ud83e\udef1\ud83c\udffb\u200d\ud83e\udef2\ud83c\udfff","\ud83e\udef1\ud83c\udffb\u200b\ud83e\udef2\ud83c\udfff")}return!1}function f(e){var t="undefined"!=typeof WorkerGlobalScope&&self instanceof WorkerGlobalScope?new OffscreenCanvas(300,150):a.createElement("canvas"),n=t.getContext("2d",{willReadFrequently:!0}),r=(n.textBaseline="top",n.font="600 32px Arial",{});return e.forEach(function(e){r[e]=c(n,e)}),r}function t(e){var t=a.createElement("script");t.src=e,t.defer=!0,a.head.appendChild(t)}"undefined"!=typeof Promise&&(o="wpEmojiSettingsSupports",s=["flag","emoji"],n.supports={everything:!0,everythingExceptFlag:!0},e=new Promise(function(e){a.addEventListener("DOMContentLoaded",e,{once:!0})}),new Promise(function(t){var n=function(){if("undefined"!=typeof sessionStorage&&o in sessionStorage)try{var e=JSON.parse(sessionStorage.getItem(o));if("object"==typeof e&&"number"==typeof e.timestamp&&(new Date).valueOf()<e.timestamp+604800&&"object"==typeof e.supportTests)return e.supportTests}catch(e){}return null}();if(!n){if("undefined"!=typeof Worker&&"undefined"!=typeof OffscreenCanvas&&"undefined"!=typeof URL&&URL.createObjectURL&&"undefined"!=typeof Blob)try{var e="var emojiSetsRenderIdentically = "+p+";var browserSupportsEmoji = "+c+";var testEmojiSupports = "+f+";postMessage(testEmojiSupports("+JSON.stringify(s)+"));",r=new Blob([e],{type:"text/javascript"});return void(new Worker(URL.createObjectURL(r)).onmessage=function(e){i(n=e.data),t(n)})}catch(e){}i(n=f(s))}t(n)}).then(function(e){for(var t in e)n.supports[t]=e[t],n.supports.everything=n.supports.everything&&n.supports[t],"flag"!==t&&(n.supports.everythingExceptFlag=n.supports.everythingExceptFlag&&n.supports[t]);n.supports.everythingExceptFlag=n.supports.everythingExceptFlag&&!n.supports.flag,n.DOMReady=!1,n.readyCallback=function(){n.DOMReady=!0}}).then(function(){return e}).then(function(){var e;n.supports.everything||(n.readyCallback(),(e=n.source||{}).concatemoji?t(e.concatemoji):e.wpemoji&&e.twemoji&&(t(e.twemoji),t(e.wpemoji)))}))}((window,document),window._wpemojiSettings);
|
||||
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@ -16,7 +16,7 @@
|
|||
*
|
||||
* @global string $wp_version
|
||||
*/
|
||||
$wp_version = '6.3-alpha-56073';
|
||||
$wp_version = '6.3-alpha-56074';
|
||||
|
||||
/**
|
||||
* Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.
|
||||
|
|
|
|||
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Reference in New Issue
Block a user