51 lines
2.0 KiB
JavaScript
51 lines
2.0 KiB
JavaScript
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 emojify = (str, customEmojis = {}) => {
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// This walks through the string from start to end, ignoring any tags (<p>, <br>, etc.)
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// and replacing valid unicode strings
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// that _aren't_ within tags with an <img> version.
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// The goal is to be the same as an emojione.regUnicode replacement, but faster.
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let i = -1;
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let insideTag = false;
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let insideShortname = false;
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let shortnameStartIndex = -1;
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let match;
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while (++i < str.length) {
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const char = str.charAt(i);
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if (insideShortname && char === ':') {
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const shortname = str.substring(shortnameStartIndex, i + 1);
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if (shortname in customEmojis) {
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const replacement = `<img draggable="false" class="emojione" alt="${shortname}" title="${shortname}" src="${customEmojis[shortname]}" />`;
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str = str.substring(0, shortnameStartIndex) + replacement + str.substring(i + 1);
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i += (replacement.length - shortname.length - 1); // jump ahead the length we've added to the string
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} else {
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i--;
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}
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insideShortname = false;
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} else if (insideTag && char === '>') {
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insideTag = false;
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} else if (char === '<') {
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insideTag = true;
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insideShortname = false;
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} else if (!insideTag && char === ':') {
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insideShortname = true;
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shortnameStartIndex = i;
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} else if (!insideTag && (match = trie.search(str.substring(i)))) {
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const unicodeStr = match;
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if (unicodeStr in unicodeMapping) {
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const [filename, shortCode] = unicodeMapping[unicodeStr];
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const alt = unicodeStr;
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const replacement = `<img draggable="false" class="emojione" alt="${alt}" title=":${shortCode}:" src="/emoji/${filename}.svg" />`;
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str = str.substring(0, i) + replacement + str.substring(i + unicodeStr.length);
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i += (replacement.length - unicodeStr.length); // jump ahead the length we've added to the string
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}
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}
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}
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return str;
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};
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export default emojify;
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