hometown/app/javascript/mastodon/emoji.js

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import { unicodeMapping } from './emojione_light';
import Trie from 'substring-trie';
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const trie = new Trie(Object.keys(unicodeMapping));
const emojify = (str, customEmojis = {}) => {
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let rtn = '';
for (;;) {
let match, i = 0, tag;
while (i < str.length && (tag = '<&'.indexOf(str[i])) === -1 && str[i] !== ':' && !(match = trie.search(str.slice(i)))) {
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i += str.codePointAt(i) < 65536 ? 1 : 2;
}
if (i === str.length)
break;
else if (tag >= 0) {
const tagend = str.indexOf('>;'[tag], i + 1) + 1;
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if (!tagend)
break;
rtn += str.slice(0, tagend);
str = str.slice(tagend);
} else if (str[i] === ':') {
try {
// if replacing :shortname: succeed, exit this block with "continue"
const closeColon = str.indexOf(':', i + 1) + 1;
if (!closeColon) throw null; // no pair of ':'
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const lt = str.indexOf('<', i + 1);
if (!(lt === -1 || lt >= closeColon)) throw null; // tag appeared before closing ':'
const shortname = str.slice(i, closeColon);
if (shortname in customEmojis) {
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rtn += str.slice(0, i) + `<img draggable="false" class="emojione" alt="${shortname}" title="${shortname}" src="${customEmojis[shortname]}" />`;
str = str.slice(closeColon);
continue;
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}
} catch (e) {}
// replacing :shortname: failed
rtn += str.slice(0, i + 1);
str = str.slice(i + 1);
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} else {
const [filename, shortCode] = unicodeMapping[match];
rtn += str.slice(0, i) + `<img draggable="false" class="emojione" alt="${match}" title=":${shortCode}:" src="/emoji/${filename}.svg" />`;
str = str.slice(i + match.length);
}
}
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return rtn + str;
};
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export default emojify;