index.js

exports.version = require('./package').version;

exports.wordTrans = (text, dict, join = ' ') => {
	if (typeof text !== 'string') throw new TypeError('text must be a string.');
	if (typeof dict !== 'object') throw new TypeError('dictionary must be an object.');
	return text.split(' ').map(word => {
		const strip = word.replace(/[!@#$%^&*()`~=+[\]{};:",.<>?]/g, '').replace(/(?:s'|'s)$/, '');
		const lowerCase = strip.toLowerCase();
		if (!dict[lowerCase]) return word;
		let change = word.toLowerCase().replace(lowerCase, dict[lowerCase]);
		if (strip.charAt(0).toUpperCase() === strip.charAt(0)) {
			change = change.replace(dict[lowerCase].charAt(0), dict[lowerCase].charAt(0).toUpperCase());
		}
		if (strip.length > 1 && strip.toUpperCase() === strip) change = change.toUpperCase();
		return change;
	}).join(join);
};

exports.letterTrans = (text, dict, join = '') => {
	if (typeof text !== 'string') throw new TypeError('text must be a string.');
	if (typeof dict !== 'object') throw new TypeError('dictionary must be an object.');
	return text.split('').map(letter => dict[letter] || letter).join(join);
};

exports.regexTrans = (text, dict, flags = 'gi') => {
	if (typeof text !== 'string') throw new TypeError('text must be a string.');
	if (typeof dict !== 'object') throw new TypeError('dictionary must be an object.');
	if (typeof flags !== 'string') throw new TypeError('flags must be a string.');
	for (const expression of Object.keys(dict)) {
		const regex = new RegExp(expression, flags);
		text = text.replace(regex, dict[expression]);
	}
	return text;
};