catstodon/app/javascript/mastodon/emoji.js

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2016-11-15 18:38:57 +01:00
import emojione from 'emojione';
import Trie from 'substring-trie';
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const mappedUnicode = emojione.mapUnicodeToShort();
const trie = new Trie(Object.keys(emojione.jsEscapeMap));
function emojify(str) {
// This walks through the string from start to end, ignoring any tags (<p>, <br>, etc.)
// and replacing valid shortnames like :smile: and :wink: as well as unicode strings
// that _aren't_ within tags with an <img> version.
// The goal is to be the same as an emojione.regShortNames/regUnicode replacement, but faster.
let i = -1;
let insideTag = false;
let insideShortname = false;
let shortnameStartIndex = -1;
let match;
while (++i < str.length) {
const char = str.charAt(i);
if (insideShortname && char === ':') {
const shortname = str.substring(shortnameStartIndex, i + 1);
if (shortname in emojione.emojioneList) {
const unicode = emojione.emojioneList[shortname].unicode[emojione.emojioneList[shortname].unicode.length - 1];
const alt = emojione.convert(unicode.toUpperCase());
const replacement = `<img draggable="false" class="emojione" alt="${alt}" title="${shortname}" src="/emoji/${unicode}.svg" />`;
str = str.substring(0, shortnameStartIndex) + replacement + str.substring(i + 1);
i += (replacement.length - shortname.length - 1); // jump ahead the length we've added to the string
} else {
i--; // stray colon, try again
}
insideShortname = false;
} else if (insideTag && char === '>') {
insideTag = false;
} else if (char === '<') {
insideTag = true;
insideShortname = false;
} else if (!insideTag && char === ':') {
insideShortname = true;
shortnameStartIndex = i;
} else if (!insideTag && (match = trie.search(str.substring(i)))) {
const unicodeStr = match;
if (unicodeStr in emojione.jsEscapeMap) {
const unicode = emojione.jsEscapeMap[unicodeStr];
const short = mappedUnicode[unicode];
const filename = emojione.emojioneList[short].fname;
const alt = emojione.convert(unicode.toUpperCase());
const replacement = `<img draggable="false" class="emojione" alt="${alt}" title="${short}" src="/emoji/${filename}.svg" />`;
str = str.substring(0, i) + replacement + str.substring(i + unicodeStr.length);
i += (replacement.length - unicodeStr.length); // jump ahead the length we've added to the string
}
}
}
return str;
}
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export default emojify;