mirror of
https://github.com/twitter/twemoji.git
synced 2024-11-16 20:25:58 +00:00
589 lines
21 KiB
JavaScript
589 lines
21 KiB
JavaScript
/*jslint indent: 2, browser: true, bitwise: true, plusplus: true */
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var twemoji = (function (
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/*! Copyright Twitter Inc. and other contributors. Licensed under MIT *//*
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https://github.com/twitter/twemoji/blob/gh-pages/LICENSE
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*/
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// WARNING: this file is generated automatically via
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// `node twemoji-generator.js`
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// please update its `createTwemoji` function
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// at the bottom of the same file instead.
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) {
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'use strict';
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/*jshint maxparams:4 */
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var
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// the exported module object
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twemoji = {
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/////////////////////////
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// properties //
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/////////////////////////
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// default assets url, by default will be Twitter Inc. CDN
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base: (location.protocol === 'https:' ? 'https:' : 'http:') +
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'//twemoji.maxcdn.com/',
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// default assets file extensions, by default '.png'
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ext: '.png',
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// default assets/folder size, by default "36x36"
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// available via Twitter CDN: 16, 36, 72
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size: '36x36',
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// default class name, by default 'emoji'
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className: 'emoji',
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// basic utilities / helpers to convert code points
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// to JavaScript surrogates and vice versa
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convert: {
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/**
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* Given an HEX codepoint, returns UTF16 surrogate pairs.
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*
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* @param string generic codepoint, i.e. '1F4A9'
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* @return string codepoint transformed into utf16 surrogates pair,
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* i.e. \uD83D\uDCA9
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*
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* @example
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* twemoji.convert.fromCodePoint('1f1e8');
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* // "\ud83c\udde8"
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*
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* '1f1e8-1f1f3'.split('-').map(twemoji.convert.fromCodePoint).join('')
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* // "\ud83c\udde8\ud83c\uddf3"
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*/
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fromCodePoint: fromCodePoint,
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/**
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* Given UTF16 surrogate pairs, returns the equivalent HEX codepoint.
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*
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* @param string generic utf16 surrogates pair, i.e. \uD83D\uDCA9
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* @param string optional separator for double code points, default='-'
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* @return string utf16 transformed into codepoint, i.e. '1F4A9'
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*
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* @example
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* twemoji.convert.toCodePoint('\ud83c\udde8\ud83c\uddf3');
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* // "1f1e8-1f1f3"
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*
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* twemoji.convert.toCodePoint('\ud83c\udde8\ud83c\uddf3', '~');
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* // "1f1e8~1f1f3"
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*/
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toCodePoint: toCodePoint
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},
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/////////////////////////
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// methods //
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/////////////////////////
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/**
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* User first: used to remove missing images
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* preserving the original text intent when
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* a fallback for network problems is desired.
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* Automatically added to Image nodes via DOM
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* It could be recycled for string operations via:
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* $('img.emoji').on('error', twemoji.onerror)
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*/
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onerror: function onerror() {
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if (this.parentNode) {
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this.parentNode.replaceChild(createText(this.alt), this);
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}
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},
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/**
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* Main method/logic to generate either <img> tags or HTMLImage nodes.
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* "emojify" a generic text or DOM Element.
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*
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* @overloads
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*
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* String replacement for `innerHTML` or server side operations
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* twemoji.parse(string);
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* twemoji.parse(string, Function);
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* twemoji.parse(string, Object);
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*
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* HTMLElement tree parsing for safer operations over existing DOM
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* twemoji.parse(HTMLElement);
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* twemoji.parse(HTMLElement, Function);
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* twemoji.parse(HTMLElement, Object);
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*
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* @param string|HTMLElement the source to parse and enrich with emoji.
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*
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* string replace emoji matches with <img> tags.
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* Mainly used to inject emoji via `innerHTML`
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* It does **not** parse the string or validate it,
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* it simply replaces found emoji with a tag.
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* NOTE: be sure this won't affect security.
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*
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* HTMLElement walk through the DOM tree and find emoji
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* that are inside **text node only** (nodeType === 3)
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* Mainly used to put emoji in already generated DOM
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* without compromising surrounding nodes and
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* **avoiding** the usage of `innerHTML`.
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* NOTE: Using DOM elements instead of strings should
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* improve security without compromising too much
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* performance compared with a less safe `innerHTML`.
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*
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* @param Function|Object [optional]
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* either the callback that will be invoked or an object
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* with all properties to use per each found emoji.
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*
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* Function if specified, this will be invoked per each emoji
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* that has been found through the RegExp except
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* those follwed by the invariant \uFE0E ("as text").
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* Once invoked, parameters will be:
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*
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* codePoint:string the lower case HEX code point
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* i.e. "1f4a9"
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*
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* options:Object all info for this parsing operation
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*
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* variant:char the optional \uFE0F ("as image")
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* variant, in case this info
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* is anyhow meaningful.
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* By default this is ignored.
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*
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* If such callback will return a falsy value instead
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* of a valid `src` to use for the image, nothing will
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* actually change for that specific emoji.
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*
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*
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* Object if specified, an object containing the following properties
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*
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* callback Function the callback to invoke per each found emoji.
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* base string the base url, by default twemoji.base
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* ext string the image extension, by default twemoji.ext
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* size string the assets size, by default twemoji.size
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*
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* @example
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*
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* twemoji.parse("I \u2764\uFE0F emoji!");
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* // I <img class="emoji" draggable="false" alt="❤️" src="/assets/2764.gif"> emoji!
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*
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*
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* twemoji.parse("I \u2764\uFE0F emoji!", function(icon, options, variant) {
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* return '/assets/' + icon + '.gif';
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* });
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* // I <img class="emoji" draggable="false" alt="❤️" src="/assets/2764.gif"> emoji!
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*
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*
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* twemoji.parse("I \u2764\uFE0F emoji!", {
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* size: 72,
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* callback: function(icon, options, variant) {
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* return '/assets/' + options.size + '/' + icon + options.ext;
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* }
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* });
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* // I <img class="emoji" draggable="false" alt="❤️" src="/assets/72x72/2764.png"> emoji!
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*
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*/
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parse: parse,
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/**
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* Given a string, invokes the callback argument
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* per each emoji found in such string.
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* This is the most raw version used by
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* the .parse(string) method itself.
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*
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* @param string generic string to parse
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* @param Function a generic callback that will be
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* invoked to replace the content.
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* This calback wil receive standard
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* String.prototype.replace(str, callback)
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* arguments such:
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* callback(
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* match, // the emoji match
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* icon, // the emoji text (same as text)
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* variant // either '\uFE0E' or '\uFE0F', if present
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* );
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*
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* and others commonly received via replace.
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*
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* NOTE: When the variant \uFE0E is found, remember this is an explicit intent
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* from the user: the emoji should **not** be replaced with an image.
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* In \uFE0F case one, it's the opposite, it should be graphic.
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* This utility convetion is that only \uFE0E are not translated into images.
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*/
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replace: replace,
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/**
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* Simplify string tests against emoji.
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*
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* @param string some text that might contain emoji
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* @return boolean true if any emoji was found, false otherwise.
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*
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* @example
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*
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* if (twemoji.test(someContent)) {
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* console.log("emoji All The Things!");
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* }
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*/
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test: test
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},
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// used to escape HTML special chars in attributes
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escaper = {
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'&': '&',
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'<': '<',
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'>': '>',
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"'": ''',
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'"': '"'
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},
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// RegExp based on emoji's official Unicode standards
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// http://www.unicode.org/Public/UNIDATA/EmojiSources.txt
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re = /((?:[\xA9\xAE\u2106\u2113-\u211C\u2122\u23E9-\u23EC\u23F0\u23F3\u26CE\u2705\u270A\u270B\u2728\u274C\u274E\u2753-\u2755\u2795-\u2797\u27B0\u27BF\u3030\uE50A]|\uD82D[\uDC3D-\uDC7B\uDC7D\uDC7F-\uDD34\uDD36-\uDD39\uDD3D-\uDD7A\uDD8D-\uDDA4\uDDAC\uDDAD\uDDBA\uDDCA\uDDCD-\uDDD6\uDE22-\uDE7D\uDE82-\uDE8D\uDEBD-\uDF02\uDF3C-\uDF5C\uDF6C-\uDF71\uDF73-\uDFB8\uDFBC-\uDFCF\uDFDC-\uDFFF]|\uD82E[\uDC00\uDC02-\uDC06\uDC1C-\uDC2C]|\uD89B[\uDC4B\uDC53\uDC5A\uDC5C\uDC5F\uDC69\uDC6A])|(?:(?:[\u203C\u2049\u2139\u2194-\u2199\u21A9\u21AA\u231A\u231B\u24C2\u25AA\u25AB\u25B6\u25C0\u25FB-\u25FE\u2600\u2601\u260E\u2611\u2614\u2615\u261D\u263A\u2648-\u2653\u2660\u2663\u2665\u2666\u2668\u267B\u267F\u2693\u26A0\u26A1\u26AA\u26AB\u26BD\u26BE\u26C4\u26C5\u26D4\u26EA\u26F2\u26F3\u26F5\u26FA\u26FD\u2702\u2708\u2709\u270C\u270F\u2712\u2714\u2716\u2733\u2734\u2744\u2747\u2757\u2764\u27A1\u2934\u2935\u2B05-\u2B07\u2B1B\u2B1C\u2B50\u2B55\u303D\u3297\u3299]|\uD82D[\uDC40\uDDBB\uDE56\uDE6B])([\uFE0E\uFE0F]?)))/g,
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// used to find HTML special chars in attributes
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rescaper = /[&<>'"]/g,
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// nodes with type 1 which should **not** be parsed
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shouldntBeParsed = /IFRAME|NOFRAMES|NOSCRIPT|SCRIPT|SELECT|STYLE|TEXTAREA/,
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// just a private shortcut
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fromCharCode = String.fromCharCode;
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return twemoji;
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/////////////////////////
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// private functions //
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// declaration //
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/////////////////////////
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/**
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* Shortcut to create text nodes
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* @param string text used to create DOM text node
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* @return Node a DOM node with that text
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*/
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function createText(text) {
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return document.createTextNode(text);
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}
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/**
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* Utility function to escape html attribute text
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* @param string text use in HTML attribute
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* @return string text encoded to use in HTML attribute
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*/
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function escapeHTML(s) {
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return s.replace(rescaper, replacer);
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}
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/**
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* Default callback used to generate emoji src
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* based on Twitter CDN
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* @param string the emoji codepoint string
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* @param string the default size to use, i.e. "36x36"
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* @param string optional "\uFE0F" variant char, ignored by default
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* @return string the image source to use
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*/
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function defaultImageSrcGenerator(icon, options) {
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return ''.concat(options.base, options.size, '/', icon, options.ext);
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}
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/**
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* Given a generic DOM nodeType 1, walk through all children
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* and store every nodeType 3 (#text) found in the tree.
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* @param Element a DOM Element with probably some text in it
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* @param Array the list of previously discovered text nodes
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* @return Array same list with new discovered nodes, if any
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*/
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function grabAllTextNodes(node, allText) {
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var
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childNodes = node.childNodes,
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length = childNodes.length,
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subnode,
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nodeType;
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while (length--) {
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subnode = childNodes[length];
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nodeType = subnode.nodeType;
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// parse emoji only in text nodes
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if (nodeType === 3) {
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// collect them to process emoji later
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allText.push(subnode);
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}
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// ignore all nodes that are not type 1 or that
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// should not be parsed as script, style, and others
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else if (nodeType === 1 && !shouldntBeParsed.test(subnode.nodeName)) {
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grabAllTextNodes(subnode, allText);
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}
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}
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return allText;
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}
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/**
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* Used to both remove the possible variant
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* and to convert utf16 into code points
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* @param string the emoji surrogate pair
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* @param string the optional variant char, if any
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*/
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function grabTheRightIcon(icon, variant) {
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// if variant is present as \uFE0F
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return toCodePoint(
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variant === '\uFE0F' ?
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// the icon should not contain it
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icon.slice(0, -1) :
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// fix non standard OSX behavior
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(icon.length === 3 && icon.charAt(1) === '\uFE0F' ?
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icon.charAt(0) + icon.charAt(2) : icon)
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);
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}
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/**
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* DOM version of the same logic / parser:
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* emojify all found sub-text nodes placing images node instead.
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* @param Element generic DOM node with some text in some child node
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* @param Object options containing info about how to parse
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*
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* .callback Function the callback to invoke per each found emoji.
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* .base string the base url, by default twemoji.base
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* .ext string the image extension, by default twemoji.ext
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* .size string the assets size, by default twemoji.size
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*
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* @return Element same generic node with emoji in place, if any.
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*/
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function parseNode(node, options) {
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var
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allText = grabAllTextNodes(node, []),
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length = allText.length,
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attrib,
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attrname,
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modified,
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fragment,
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subnode,
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text,
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match,
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i,
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index,
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img,
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alt,
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icon,
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variant,
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src;
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while (length--) {
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modified = false;
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fragment = document.createDocumentFragment();
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subnode = allText[length];
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text = subnode.nodeValue;
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i = 0;
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while ((match = re.exec(text))) {
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index = match.index;
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if (index !== i) {
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fragment.appendChild(
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createText(text.slice(i, index))
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);
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}
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alt = match[0];
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icon = match[1];
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variant = match[2];
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i = index + alt.length;
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if (variant !== '\uFE0E') {
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src = options.callback(
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grabTheRightIcon(icon, variant),
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options,
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variant
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);
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if (src) {
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img = new Image();
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img.onerror = twemoji.onerror;
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img.setAttribute('draggable', 'false');
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attrib = options.attributes(icon, variant);
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for (attrname in attrib) {
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if (
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attrib.hasOwnProperty(attrname) &&
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// don't allow any handlers to be set + don't allow overrides
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attrname.indexOf('on') !== 0 &&
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!img.hasAttribute(attrname)
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) {
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img.setAttribute(attrname, attrib[attrname]);
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}
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}
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img.className = options.className;
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img.alt = alt;
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img.src = src;
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modified = true;
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fragment.appendChild(img);
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}
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}
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if (!img) fragment.appendChild(createText(alt));
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img = null;
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}
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// is there actually anything to replace in here ?
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if (modified) {
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// any text left to be added ?
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if (i < text.length) {
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fragment.appendChild(
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createText(text.slice(i))
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);
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}
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// replace the text node only, leave intact
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// anything else surrounding such text
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subnode.parentNode.replaceChild(fragment, subnode);
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}
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}
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return node;
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}
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/**
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* String/HTML version of the same logic / parser:
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* emojify a generic text placing images tags instead of surrogates pair.
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* @param string generic string with possibly some emoji in it
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* @param Object options containing info about how to parse
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*
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* .callback Function the callback to invoke per each found emoji.
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* .base string the base url, by default twemoji.base
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* .ext string the image extension, by default twemoji.ext
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* .size string the assets size, by default twemoji.size
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*
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* @return the string with <img tags> replacing all found and parsed emoji
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*/
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function parseString(str, options) {
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return replace(str, function (match, icon, variant) {
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var
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ret = match,
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attrib,
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attrname,
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src;
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// verify the variant is not the FE0E one
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// this variant means "emoji as text" and should not
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// require any action/replacement
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// http://unicode.org/Public/UNIDATA/StandardizedVariants.html
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if (variant !== '\uFE0E') {
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src = options.callback(
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grabTheRightIcon(icon, variant),
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options,
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variant
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);
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if (src) {
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// recycle the match string replacing the emoji
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// with its image counter part
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ret = '<img '.concat(
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'class="', options.className, '" ',
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'draggable="false" ',
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// needs to preserve user original intent
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// when variants should be copied and pasted too
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'alt="',
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match,
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'"',
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' src="',
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src,
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'"'
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);
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attrib = options.attributes(icon, variant);
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for (attrname in attrib) {
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if (
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attrib.hasOwnProperty(attrname) &&
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// don't allow any handlers to be set + don't allow overrides
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attrname.indexOf('on') !== 0 &&
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ret.indexOf(' ' + attrname + '=') === -1
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) {
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ret = ret.concat(' ', attrname, '="', escapeHTML(attrib[attrname]), '"');
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}
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}
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ret = ret.concat('>');
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|
}
|
|
}
|
|
return ret;
|
|
});
|
|
}
|
|
|
|
/**
|
|
* Function used to actually replace HTML special chars
|
|
* @param string HTML special char
|
|
* @return string encoded HTML special char
|
|
*/
|
|
function replacer(m) {
|
|
return escaper[m];
|
|
}
|
|
|
|
/**
|
|
* Default options.attribute callback
|
|
* @return null
|
|
*/
|
|
function returnNull() {
|
|
return null;
|
|
}
|
|
|
|
/**
|
|
* Given a generic value, creates its squared counterpart if it's a number.
|
|
* As example, number 36 will return '36x36'.
|
|
* @param any a generic value.
|
|
* @return any a string representing asset size, i.e. "36x36"
|
|
* only in case the value was a number.
|
|
* Returns initial value otherwise.
|
|
*/
|
|
function toSizeSquaredAsset(value) {
|
|
return typeof value === 'number' ?
|
|
value + 'x' + value :
|
|
value;
|
|
}
|
|
|
|
|
|
/////////////////////////
|
|
// exported functions //
|
|
// declaration //
|
|
/////////////////////////
|
|
|
|
function fromCodePoint(codepoint) {
|
|
var code = typeof codepoint === 'string' ?
|
|
parseInt(codepoint, 16) : codepoint;
|
|
if (code < 0x10000) {
|
|
return fromCharCode(code);
|
|
}
|
|
code -= 0x10000;
|
|
return fromCharCode(
|
|
0xD800 + (code >> 10),
|
|
0xDC00 + (code & 0x3FF)
|
|
);
|
|
}
|
|
|
|
function parse(what, how) {
|
|
if (!how || typeof how === 'function') {
|
|
how = {callback: how};
|
|
}
|
|
// if first argument is string, inject html <img> tags
|
|
// otherwise use the DOM tree and parse text nodes only
|
|
return (typeof what === 'string' ? parseString : parseNode)(what, {
|
|
callback: how.callback || defaultImageSrcGenerator,
|
|
attributes: typeof how.attributes === 'function' ? how.attributes : returnNull,
|
|
base: typeof how.base === 'string' ? how.base : twemoji.base,
|
|
ext: how.ext || twemoji.ext,
|
|
size: how.folder || toSizeSquaredAsset(how.size || twemoji.size),
|
|
className: how.className || twemoji.className
|
|
});
|
|
}
|
|
|
|
function replace(text, callback) {
|
|
return String(text).replace(re, callback);
|
|
}
|
|
|
|
function test(text) {
|
|
// IE6 needs a reset before too
|
|
re.lastIndex = 0;
|
|
var result = re.test(text);
|
|
re.lastIndex = 0;
|
|
return result;
|
|
}
|
|
|
|
function toCodePoint(unicodeSurrogates, sep) {
|
|
var
|
|
r = [],
|
|
c = 0,
|
|
p = 0,
|
|
i = 0;
|
|
while (i < unicodeSurrogates.length) {
|
|
c = unicodeSurrogates.charCodeAt(i++);
|
|
if (p) {
|
|
r.push((0x10000 + ((p - 0xD800) << 10) + (c - 0xDC00)).toString(16));
|
|
p = 0;
|
|
} else if (0xD800 <= c && c <= 0xDBFF) {
|
|
p = c;
|
|
} else {
|
|
r.push(c.toString(16));
|
|
}
|
|
}
|
|
return r.join(sep || '-');
|
|
}
|
|
|
|
}()); |