app/javascript/mastodon/emoji.js

   1 import { unicodeMapping } from './emojione_light';
   2 import Trie from 'substring-trie';
   3
   4 const trie = new Trie(Object.keys(unicodeMapping));
   5
   6 const assetHost = process.env.CDN_HOST || '';
   7
   8 const emojify = (str, customEmojis = {}) => {
   9   let rtn = '';
  10   for (;;) {
  11     let match, i = 0, tag;
  12     while (i < str.length && (tag = '<&'.indexOf(str[i])) === -1 && str[i] !== ':' && !(match = trie.search(str.slice(i)))) {
  13       i += str.codePointAt(i) < 65536 ? 1 : 2;
  14     }
  15     if (i === str.length)
  16       break;
  17     else if (tag >= 0) {
  18       const tagend = str.indexOf('>;'[tag], i + 1) + 1;
  19       if (!tagend)
  20         break;
  21       rtn += str.slice(0, tagend);
  22       str = str.slice(tagend);
  23     } else if (str[i] === ':') {
  24       try {
  25         // if replacing :shortname: succeed, exit this block with "continue"
  26         const closeColon = str.indexOf(':', i + 1) + 1;
  27         if (!closeColon) throw null; // no pair of ':'
  28         const lt = str.indexOf('<', i + 1);
  29         if (!(lt === -1 || lt >= closeColon)) throw null; // tag appeared before closing ':'
  30         const shortname = str.slice(i, closeColon);
  31         if (shortname in customEmojis) {
  32           rtn += str.slice(0, i) + `<img draggable="false" class="emojione" alt="${shortname}" title="${shortname}" src="${customEmojis[shortname]}" />`;
  33           str = str.slice(closeColon);
  34           continue;
  35         }
  36       } catch (e) {}
  37       // replacing :shortname: failed
  38       rtn += str.slice(0, i + 1);
  39       str = str.slice(i + 1);
  40     } else {
  41       const [filename, shortCode] = unicodeMapping[match];
  42       rtn += str.slice(0, i) + `<img draggable="false" class="emojione" alt="${match}" title=":${shortCode}:" src="${assetHost}/emoji/${filename}.svg" />`;
  43       str = str.slice(i + match.length);
  44     }
  45   }
  46   return rtn + str;
  47 };
  48
  49 export default emojify;
  50
  51 export const buildCustomEmojis = customEmojis => {
  52   const emojis = [];
  53
  54   customEmojis.forEach(emoji => {
  55     const shortcode = emoji.get('shortcode');
  56     const url       = emoji.get('url');
  57     const name      = shortcode.replace(':', '');
  58
  59     emojis.push({
  60       id: name,
  61       name,
  62       short_names: [name],
  63       text: '',
  64       emoticons: [],
  65       keywords: [name],
  66       imageUrl: url,
  67       custom: true,
  68     });
  69   });
  70
  71   return emojis;
  72 };