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