gematriya.js

/*
 * Convert numbers to gematriya representation, and vice-versa.
 *
 * Licensed MIT.
 *
 * Copyright (c) 2014 Eyal Schachter

 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

(function(){
	var letters = {}, numbers = {
		'': 0,
		א: 1,
		ב: 2,
		ג: 3,
		ד: 4,
		ה: 5,
		ו: 6,
		ז: 7,
		ח: 8,
		ט: 9,
		י: 10,
		כ: 20,
		ל: 30,
		מ: 40,
		נ: 50,
		ס: 60,
		ע: 70,
		פ: 80,
		צ: 90,
		ק: 100,
		ר: 200,
		ש: 300,
		ת: 400,
		תק: 500,
		תר: 600,
		תש: 700,
		תת: 800,
		תתק: 900,
		תתר: 1000
	}, i;
	for (i in numbers) {
		letters[numbers[i]] = i;
	}

	function gematriya(num, options) {
		if (options === undefined) {
			var options = {limit: false, punctuate: true, order: false, geresh: true};
		}

		if (typeof num !== 'number' && typeof num !== 'string') {
			throw new TypeError('non-number or string given to gematriya()');
		}

		if (typeof options !== 'object' || options === null){
			throw new TypeError('An object was not given as second argument')
		}

		var limit = options.limit;
		var order = options.order;
		var punctuate = typeof options.punctuate === 'undefined' ? true : options.punctuate;
		var geresh = typeof options.geresh === 'undefined' && punctuate ? true : options.geresh;

		var str = typeof num === 'string';

		if (str) {
			num = num.replace(/('|")/g,'');
		}
		num = num.toString().split('').reverse();
		if (!str && limit) {
			num = num.slice(0, limit);
		}

		num = num.map(function g(n,i){
			if (str) {
				return order && numbers[n] < numbers[num[i - 1]] && numbers[n] < 100 ? numbers[n] * 1000 : numbers[n];
			} else {
				if (parseInt(n, 10) * Math.pow(10, i) > 1000) {
					return g(n, i-3);
				}
				return letters[parseInt(n, 10) * Math.pow(10, i)];
			}
		});

		if (str) {
			return num.reduce(function(o,t){
				return o + t;
			}, 0);
		} else {
			num = num.reverse().join('').replace(/יה/g,'טו').replace(/יו/g,'טז').split('');

			if (punctuate || geresh)	{
				if (num.length === 1) {
					num.push(geresh ? '׳' : "'");
				} else if (num.length > 1) {
					num.splice(-1, 0, geresh ? '״' : '"');
				}
			}

			return num.join('');
		}
	}

	if (typeof module !== 'undefined') {
		module.exports = gematriya;
	} else {
		window.gematriya = gematriya;
	}
})();