Rocket.Chat.ReactNative/app/utils/shortnameToUnicode/index.ts

import emojis from './emojis';
import ascii, { asciiRegexp } from './ascii';

const shortnamePattern = new RegExp(/:[-+_a-z0-9]+:/, 'gi');
const replaceShortNameWithUnicode = (shortname: string) => emojis[shortname] || shortname;
const regAscii = new RegExp(`((\\s|^)${asciiRegexp}(?=\\s|$|[!,.?]))`, 'gi');

const unescapeHTML = (string: string) => {
	const unescaped: { [key: string]: string } = {
		'&': '&',
		'&': '&',
		'&': '&',
		'&lt;': '<',
		'&#60;': '<',
		'&#x3C;': '<',
		'&gt;': '>',
		'&#62;': '>',
		'&#x3E;': '>',
		'&quot;': '"',
		'&#34;': '"',
		'&#x22;': '"',
		'&apos;': "'",
		'&#39;': "'",
		'&#x27;': "'"
	};

	return string.replace(/&(?:amp|#38|#x26|lt|#60|#x3C|gt|#62|#x3E|apos|#39|#x27|quot|#34|#x22);/gi, match => unescaped[match]);
};

const shortnameToUnicode = (str: string): string => {
	str = str.replace(shortnamePattern, replaceShortNameWithUnicode);

	str = str.replace(regAscii, (entire, m1, m2, m3) => {
		if (!m3 || !(unescapeHTML(m3) in ascii)) {
			// if the ascii doesnt exist just return the entire match
			return entire;
		}

		m3 = unescapeHTML(m3);
		return ascii[m3];
	});

	return str;
};

export default shortnameToUnicode;