nyastodon/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 => {
let rtn = '';
for (;;) {
let match, i = 0;
while (i < str.length && str[i] !== '<' && !(match = trie.search(str.slice(i)))) {
i += str.codePointAt(i) < 65536 ? 1 : 2;
}
if (i === str.length)
break;
else if (str[i] === '<') {
let tagend = str.indexOf('>', i + 1) + 1;
if (!tagend)
break;
rtn += str.slice(0, tagend);
str = str.slice(tagend);
} 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);
}
}
return rtn + str;
};
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export default emojify;