mirror of
https://github.com/twitter/twemoji.git
synced 2024-11-19 11:14:59 +00:00
858 lines
30 KiB
JavaScript
Executable File
858 lines
30 KiB
JavaScript
Executable File
#!/usr/bin/env node
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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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// dependencies
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var fs = require('fs');
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var http = require('http');
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var path = require('path');
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function file(which) {
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return path.join(__dirname, '../../', which);
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}
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// Twitter assets by property name
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var assets = {
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'16x16': [],
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'36x36': [],
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'72x72': []
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};
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// white spaces we don't want to catch via the RegExp
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// there is no asset equivalent for these
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var ignoreMissing = ['2002', '2003', '2005'];
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// basic utility to organize async code
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// see: http://webreflection.blogspot.co.uk/2012/03/tweet-sized-queue-system.html
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// or: http://webreflection.blogspot.co.uk/2012/06/working-with-queues.html
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function Queue(args, f) {
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setTimeout(args.next = function next() {
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return (f = args.shift()) ? !!f(args) || !0 : !1;
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}, 0);
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return args;
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}
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// main task
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Queue([
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// will populate assets arrays
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function grabAllAssets(q) {
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console.log('analyzing all assets ... ');
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// per each path/folder
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Object.keys(assets).forEach(function (path, i, paths) {
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// grab all files in that folder
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fs.readdir(file(path), function (err, files) {
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// and add them to the assets path
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assets[path].push.apply(
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assets[path],
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files.map(upperCaseWithoutExtension)
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);
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// once all assets arrays have been populated
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if (paths.reduce(completed, true)) {
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console.log('[INFO] assets contains ' + assets[path].length + ' emoji.');
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q.next();
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}
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});
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});
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// drop extension + uppercase
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function upperCaseWithoutExtension(file) {
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return file.slice(0, file.lastIndexOf('.')).toUpperCase();
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}
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// returns true if all assets have been populated
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function completed(p, c) {
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return p && assets[c].length;
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}
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},
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// will fetch and store all emoji from unicode.org
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function fetchEmojiSources(q) {
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console.log('fetching EmojiSources.txt ... ');
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// grab all emoji and test them against them
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http.get("http://www.unicode.org/Public/UNIDATA/EmojiSources.txt", function (res) {
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var chunks = [];
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// if all good ...
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if (res.statusCode === 200) {
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// grab all data
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res.on('data', chunks.push.bind(chunks));
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// once done ...
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res.on('end', function () {
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console.log('analizing EmojiSources VS our assets ... ');
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// store all missing assets in one object
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var missing = {};
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// will be used to store an array with all missing
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var missingGrouped = {};
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// will be needed later on
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// parse it, clean it, and store it once
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q.emojiSource = chunks
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.join('')
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.split(/\r\n|\r|\n/)
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// filter once
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.filter(function (line) {
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return this.test(line);
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}, /^[0-9A-F]/)
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// take only emoji info
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.map(function (codePoint) {
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return codePoint
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.slice(0, codePoint.indexOf(';'))
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.toUpperCase()
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// drop spaces
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.replace(/\s+/g, '-')
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// drop 0 padded prefixes
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.replace(/^0+/g, '');
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});
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console.log('[INFO] parsed ' + q.emojiSource.length + ' standard emoji.');
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// find out which one is missing from our assets
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q.emojiSource.forEach(
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function (emoji) {
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// do not loop for emoji we know we should ignore
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if (ignoreMissing.indexOf(emoji) < 0) {
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// verify all others per each folder
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this.forEach(function (path) {
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if (assets[path].indexOf(emoji) < 0) {
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(missing[path] || (missing[path] = [])).push(emoji);
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missingGrouped[emoji] = true;
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}
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});
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}
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},
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// and per each folder
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Object.keys(assets)
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);
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// if some missing emoji has been found
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if (Object.keys(missing).length) {
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// warn and show which one is missing
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console.warn('[WARNING] missing assets for:');
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console.log(missing);
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}
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// create the array of all emoji we should ignore
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q.ignore = ignoreMissing.concat(Object.keys(missingGrouped));
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q.next();
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});
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} else {
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console.error('[ERROR] unable to fetch emoji at unicode.org');
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process.exit(1);
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}
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});
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},
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// grab the list of emoji that behave differently when
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// variants such \uFE0E and \uFE0F are in place
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function grabStandardVariants(q) {
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console.log('fetching StandardizedVariants.txt ... ');
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http.get(
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"http://unicode.org/Public/UNIDATA/StandardizedVariants.txt",
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function(res) {
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var chunks = [];
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if (res.statusCode == 200) {
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res.on('data', chunks.push.bind(chunks));
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res.on('end', function () {
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// cleaning up parsing sensitive emoji
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q.variantsSensitive = chunks
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.join('') // all content
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.split(/\r\n|\r|\n/) // split in lines
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.filter(function (line) { // containing FE0E; info
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return this.test(line); // avoiding duplicated with FE0F
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}, / FE0E; text style/)
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.map(function (line) { // cleaned up to grab
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return line.replace(this, '$1') // only first unicode
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.toUpperCase(); // normalized as uppercase
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}, /^([0-9A-F]{4,}) FE0E;.+$/) // sensitive char
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;
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console.log('[INFO] parsed ' + q.variantsSensitive.length + ' variant sensitive emoji.');
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q.next();
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});
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} else {
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console.error('[ERROR] unable to fetch standard variants at unicode.org');
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process.exit(1);
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}
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}
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);
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},
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// add our own assets that are not part of the Unicode standard
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function addMissingEmojiAndSort(q) {
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q.nonStandard = [];
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Object.keys(assets).forEach(function (path, i) {
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assets[path].forEach(function (emoji) {
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if (
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q.emojiSource.indexOf(emoji) < 0 &&
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q.variantsSensitive.indexOf(emoji) < 0 &&
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q.nonStandard.indexOf(emoji) < 0
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) {
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q.nonStandard.push(emoji);
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}
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});
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});
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if (q.nonStandard.length) {
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console.warn('[WARNING] assets contain ' + q.nonStandard.length + ' non standard emoji:');
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// console.log(q.nonStandard.join(', '));
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}
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// order by sequence of chars length
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q.emojiSource = q.emojiSource.concat(q.nonStandard).sort(sort);
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// actually this is not needed
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// q.variantsSensitive.sort(sort);
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q.next();
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function sort(a, b) {
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var diff = b.length - a.length;
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if (diff) return diff;
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return parseInt(b.split('-')[0], 10) -
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parseInt(a.split('-')[0], 10)
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}
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},
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// with all info, generate a RegExp that will catch
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// only standard emoji that are present in our assets
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function generateRegExp(q) {
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console.log('generating a RegExp for available assets');
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var sensitive = [];
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var regular = [];
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q.emojiSource.forEach(function (codePoint) {
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var u;
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if (q.ignore.indexOf(codePoint) < 0) {
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u = codePoint.split('-').map(toJSON).join('');
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if (q.variantsSensitive.indexOf(codePoint) < 0) {
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regular.push(u);
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} else {
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sensitive.push(u);
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}
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}
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});
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// the sensitive ones may be followed by U+FE0F but not U+FE0E
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q.re = regular.join('|') + '|(?:' +
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sensitive.join('|') +
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')(?:\\ufe0f|(?!\\ufe0e))';
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q.next();
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// basic utilities to convert codepoints to JSON strings
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function toJSON(point) {
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return UTF162JSON(fromCodePoint(point));
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}
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function fromCodePoint(codepoint) {
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var code = typeof codepoint === 'string' ?
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parseInt(codepoint, 16) : codepoint;
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if (code < 0x10000) {
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return String.fromCharCode(code);
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}
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code -= 0x10000;
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return String.fromCharCode(
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0xD800 + (code >> 10),
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0xDC00 + (code & 0x3FF)
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);
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}
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function UTF162JSON(text) {
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for (var i = 0, r = []; i < text.length; i++) {
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r.push('\\u' + ('000' + text.charCodeAt(i).toString(16)).slice(-4));
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}
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return r.join('');
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}
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},
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function generateFile(q) {
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console.log('generating ./twemoji.js');
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createTwemoji(q.re);
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require('./create-dist');
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}
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]);
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function createTwemoji(re) {
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fs.writeFileSync(
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'twemoji.js',
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'/*jslint indent: 2, browser: true, bitwise: true, plusplus: true */\n' +
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'var twemoji = (' +
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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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* iconId: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(iconId, options) {
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* return '/assets/' + iconId + '.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(iconId, options) {
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* return '/assets/' + options.size + '/' + iconId + 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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* rawText, // the emoji match
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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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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 = /twemoji/,
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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 (including lower case svg)
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shouldntBeParsed = /IFRAME|NOFRAMES|NOSCRIPT|SCRIPT|SELECT|STYLE|TEXTAREA|[a-z]/,
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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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* @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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* If there is a zero-width-joiner, leave the variant in.
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* @param string the raw text of the emoji match
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*/
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function grabTheRightIcon(rawText) {
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// if variant is present as \uFE0F
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return toCodePoint(
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rawText.indexOf('\u200D') < 0 ?
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rawText.replace(/\uFE0F/g, '') :
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rawText
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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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rawText,
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iconId,
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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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rawText = match[0];
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iconId = grabTheRightIcon(rawText);
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i = index + rawText.length;
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src = options.callback(iconId, options);
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if (src) {
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img = new Image();
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img.onerror = options.onerror;
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img.setAttribute('draggable', 'false');
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attrib = options.attributes(rawText, iconId);
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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 = rawText;
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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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if (!img) fragment.appendChild(createText(rawText));
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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 (rawText) {
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var
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ret = rawText,
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iconId = grabTheRightIcon(rawText),
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src = options.callback(iconId, options),
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attrib,
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attrname;
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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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rawText,
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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(rawText, iconId);
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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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}
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return ret;
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});
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}
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/**
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* Function used to actually replace HTML special chars
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* @param string HTML special char
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* @return string encoded HTML special char
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*/
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function replacer(m) {
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return escaper[m];
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}
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/**
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* Default options.attribute callback
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* @return null
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*/
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function returnNull() {
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return null;
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}
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/**
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* Given a generic value, creates its squared counterpart if it's a number.
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* As example, number 36 will return '36x36'.
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* @param any a generic value.
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* @return any a string representing asset size, i.e. "36x36"
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* only in case the value was a number.
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* Returns initial value otherwise.
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*/
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function toSizeSquaredAsset(value) {
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return typeof value === 'number' ?
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value + 'x' + value :
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value;
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}
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/////////////////////////
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// exported functions //
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// declaration //
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/////////////////////////
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function fromCodePoint(codepoint) {
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var code = typeof codepoint === 'string' ?
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parseInt(codepoint, 16) : codepoint;
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if (code < 0x10000) {
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return fromCharCode(code);
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}
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code -= 0x10000;
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return fromCharCode(
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0xD800 + (code >> 10),
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0xDC00 + (code & 0x3FF)
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);
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}
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function parse(what, how) {
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if (!how || typeof how === 'function') {
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how = {callback: how};
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}
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// if first argument is string, inject html <img> tags
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// otherwise use the DOM tree and parse text nodes only
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return (typeof what === 'string' ? parseString : parseNode)(what, {
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callback: how.callback || defaultImageSrcGenerator,
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attributes: typeof how.attributes === 'function' ? how.attributes : returnNull,
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base: typeof how.base === 'string' ? how.base : twemoji.base,
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ext: how.ext || twemoji.ext,
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size: how.folder || toSizeSquaredAsset(how.size || twemoji.size),
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className: how.className || twemoji.className,
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onerror: how.onerror || twemoji.onerror
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});
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}
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function replace(text, callback) {
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return String(text).replace(re, callback);
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}
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function test(text) {
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// IE6 needs a reset before too
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re.lastIndex = 0;
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var result = re.test(text);
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re.lastIndex = 0;
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return result;
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}
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function toCodePoint(unicodeSurrogates, sep) {
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var
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r = [],
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c = 0,
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p = 0,
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i = 0;
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while (i < unicodeSurrogates.length) {
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c = unicodeSurrogates.charCodeAt(i++);
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if (p) {
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r.push((0x10000 + ((p - 0xD800) << 10) + (c - 0xDC00)).toString(16));
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p = 0;
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} else if (0xD800 <= c && c <= 0xDBFF) {
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p = c;
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} else {
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r.push(c.toString(16));
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}
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}
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return r.join(sep || '-');
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}
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}.toString()
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// drop current indentation
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.replace(/^ /gm, '')
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// add the RegExp in the right place
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.replace('re = /twemoji/', 're = /' + re + '/g')
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.replace(/(\\u00[2-3][0-9])(\\u20e3)/g, '$1\\ufe0f?$2')
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// add the full license
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.replace('/*! (C) Twitter Inc. */',
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'/*! (C) Twitter Inc. *//*\n' +
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fs.readFileSync(path.join(__dirname, '../../', 'LICENSE')).toString().replace(
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/^./gm, ' '
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) +
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'\n */'
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) + '());');
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}
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