@coldino/tmi.js-clientonly-fork/lib/utils.js

Javascript library for the Twitch Messaging Interface, forked to remove all node requirements (to simplify client bundling).

// eslint-disable-next-line no-control-regex
const actionMessageRegex = /^\u0001ACTION ([^\u0001]+)\u0001$/;
const justinFanRegex = /^(justinfan)(\d+$)/;
const unescapeIRCRegex = /\\([sn:r\\])/g;
const escapeIRCRegex = /([ \n;\r\\])/g;
const ircEscapedChars = { s: ' ', n: '', ':': ';', r: '' };
const ircUnescapedChars = { ' ': 's', '\n': 'n', ';': ':', '\r': 'r' };
const _ = module.exports = {
	// Return the second value if the first value is undefined..
	get: (a, b) => typeof a === 'undefined' ? b : a,

	// Indirectly use hasOwnProperty
	hasOwn: (obj, key) => ({}).hasOwnProperty.call(obj, key),

	// Race a promise against a delay..
	promiseDelay: time => new Promise(resolve => setTimeout(resolve, time)),

	// Value is a finite number..
	isFinite: int => isFinite(int) && !isNaN(parseFloat(int)),

	// Parse string to number. Returns NaN if string can't be parsed to number..
	toNumber: (num, precision) => {
		if(num === null) {
			return 0;
		}
		const factor = Math.pow(10, _.isFinite(precision) ? precision : 0);
		return Math.round(num * factor) / factor;
	},

	// Value is an integer..
	isInteger: int => !isNaN(_.toNumber(int, 0)),

	// Merge two arrays..
	union: (a, b) => [ ...new Set([ ...a, ...b ]) ],

	// Value is a regex..
	isRegex: str => /[|\\^$*+?:#]/.test(str),

	// Value is a valid url..
	isURL: str => new RegExp('^(?:(?:https?|ftp)://)(?:\\S+(?::\\S*)?@)?(?:(?!(?:10|127)(?:\\.\\d{1,3}){3})(?!(?:169\\.254|192\\.168)(?:\\.\\d{1,3}){2})(?!172\\.(?:1[6-9]|2\\d|3[0-1])(?:\\.\\d{1,3}){2})(?:[1-9]\\d?|1\\d\\d|2[01]\\d|22[0-3])(?:\\.(?:1?\\d{1,2}|2[0-4]\\d|25[0-5])){2}(?:\\.(?:[1-9]\\d?|1\\d\\d|2[0-4]\\d|25[0-4]))|(?:(?:[a-z\\u00a1-\\uffff0-9]-*)*[a-z\\u00a1-\\uffff0-9]+)(?:\\.(?:[a-z\\u00a1-\\uffff0-9]-*)*[a-z\\u00a1-\\uffff0-9]+)*(?:\\.(?:[a-z\\u00a1-\\uffff]{2,}))\\.?)(?::\\d{2,5})?(?:[/?#]\\S*)?$', 'i').test(str),

	// Return a random justinfan username..
	justinfan: () => `justinfan${Math.floor((Math.random() * 80000) + 1000)}`,

	// Username is a justinfan username..
	isJustinfan: username => justinFanRegex.test(username),

	// Return a valid channel name..
	channel: str => {
		const channel = (str ? str : '').toLowerCase();
		return channel[0] === '#' ? channel : '#' + channel;
	},

	// Return a valid username..
	username: str => {
		const username = (str ? str : '').toLowerCase();
		return username[0] === '#' ? username.slice(1) : username;
	},

	// Return a valid token..
	token: str => str ? str.toLowerCase().replace('oauth:', '') : '',

	// Return a valid password..
	password: str => {
		const token = _.token(str);
		return token ? `oauth:${token}` : '';
	},

	actionMessage: msg => msg.match(actionMessageRegex),

	// Replace all occurences of a string using an object..
	replaceAll: (str, obj) => {
		if(str === null || typeof str === 'undefined') {
			return null;
		}
		for (const x in obj) {
			str = str.replace(new RegExp(x, 'g'), obj[x]);
		}
		return str;
	},

	unescapeHtml: safe =>
		safe.replace(/\\&amp\\;/g, '&')
		.replace(/\\&lt\\;/g, '<')
		.replace(/\\&gt\\;/g, '>')
		.replace(/\\&quot\\;/g, '"')
		.replace(/\\&#039\\;/g, '\''),

	// Escaping values:
	// http://ircv3.net/specs/core/message-tags-3.2.html#escaping-values
	unescapeIRC: msg => {
		if(!msg || typeof msg !== 'string' || !msg.includes('\\')) {
			return msg;
		}
		return msg.replace(
			unescapeIRCRegex,
			(m, p) => p in ircEscapedChars ? ircEscapedChars[p] : p
		);
	},
	
	escapeIRC: msg => {
		if(!msg || typeof msg !== 'string') {
			return msg;
		}
		return msg.replace(
			escapeIRCRegex,
			(m, p) => p in ircUnescapedChars ? `\\${ircUnescapedChars[p]}` : p
		);
	},

	// Add word to a string..
	addWord: (line, word) => line.length ? line + ' ' + word : line + word,

	// Split a line but try not to cut a word in half..
	splitLine: (input, length) => {
		let lastSpace = input.substring(0, length).lastIndexOf(' ');
		// No spaces found, split at the very end to avoid a loop..
		if(lastSpace === -1) {
			lastSpace = length - 1;
		}
		return [ input.substring(0, lastSpace), input.substring(lastSpace + 1) ];
	},

	// Extract a number from a string..
	extractNumber: str => {
		const parts = str.split(' ');
		for (let i = 0; i < parts.length; i++) {
			if(_.isInteger(parts[i])) {
				return ~~parts[i];
			}
		}
		return 0;
	},

	// Format the date..
	formatDate: date => {
		let hours = date.getHours();
		let mins  = date.getMinutes();

		hours = (hours < 10 ? '0' : '') + hours;
		mins = (mins < 10 ? '0' : '') + mins;
		return `${hours}:${mins}`;
	},

	// Inherit the prototype methods from one constructor into another..
	inherits: (ctor, superCtor) => {
		ctor.super_ = superCtor;
		const TempCtor = function () {};
		TempCtor.prototype = superCtor.prototype;
		ctor.prototype = new TempCtor();
		ctor.prototype.constructor = ctor;
	},

	// Return whether inside a Node application or not..
	isNode: () => {
		try {
			return typeof process === 'object' &&
				Object.prototype.toString.call(process) === '[object process]';
		} catch(e) {}
		return false;
	}
};