polyfill.number.toLocaleString.js

(function() {
	'use strict';
	// Got this from MDN:
	// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/toLocaleString#Example:_Checking_for_support_for_locales_and_options_arguments
	function toLocaleStringSupportsLocales() {
		var number = 0;
		try {
			number.toLocaleString("i");
		} catch(e) {
			return e.name === "RangeError";
		}
		return false;
	}
	var roundOff = function (number, precision) {
		return +((+number).toFixed(precision));
	};
	var replaceSeparators = function(sNum, separators, options) {
		sNum = '' + roundOff(sNum, 3);
		var sNumParts = sNum.split('.');
		if(separators && separators.thousands) {
			sNumParts[0] = sNumParts[0].replace(/(\d)(?=(\d\d\d)+(?!\d))/g, "$1" + separators.thousands);
		} else if(separators && separators.hundreds) {
			sNumParts[0] = sNumParts[0].replace(/(\d)(?=(\d\d)+(?!\d))/g, "$1" + separators.hundreds);
		}
		if(options && options.minimumFractionDigits > 0) {
			if (sNumParts.length !== 2) {
				sNumParts[1] = '';
			}
			sNumParts[1] = sNumParts[1].padEnd(options.minimumFractionDigits, '0');
		}
		sNum = sNumParts.join(separators.decimal);
		return sNum;
	};
	var getLast3Digits = function(sNum) {
		sNum = '' + roundOff(sNum, 3);
		var sNumParts = sNum.split('.');
		switch(sNumParts[0].length) {
			case 0:
				sNumParts[0] = '000';
				break;
			case 1:
				sNumParts[0] = '00' + sNumParts[0];
				break;
			case 2:
				sNumParts[0] = '0' + sNumParts[0];
				break;
		}
		sNum = sNumParts.join('.');
		return sNum;
	};
	var renderFormat = function(template, props) {
		for(var prop in props) {
			template = template.replace("{{" + prop + "}}", props[prop]);
		}
		return template;
	};
	var mapMatch = function(map, locale) {
		var match = locale;
		var language = locale && locale.toLowerCase().match(/^\w+/);
		if(!map.hasOwnProperty(locale)) {
			if(map.hasOwnProperty(language)) {
				match = language;
			} else {
				match = "en";
			}
		}
		return map[match];
	};
	var dotThousCommaDec = function(sNum, options) {
		var separators = {
			decimal: ',',
			thousands: '.'
		};
		return replaceSeparators(sNum, separators, options);
	};
	var commaThousDotDec = function(sNum, options) {
		var separators = {
			decimal: '.',
			thousands: ','
		};
		return replaceSeparators(sNum, separators, options);
	};
	var spaceThousCommaDec = function(sNum, options) {
		var seperators = {
			decimal: ',',
			thousands: '\u00A0'
		};
		return replaceSeparators(sNum, seperators, options);
	};
	var spaceHundredsCommaThousCommaDec = function(sNum) {
		var hundredSeperators = {
				decimal: '.',
				hundreds: ','
			},
			thoudandSeperators = {
				decimal: '.',
				thousands: ','
			};
		sNum = +sNum;
		if(sNum >= 1000) {
			return replaceSeparators(Math.floor(sNum / 1000) + '', hundredSeperators) + ',' + getLast3Digits((sNum % 1000) + '');
		} else {
			return replaceSeparators(sNum + '', thoudandSeperators);
		}
	};
	var apostrophThousDotDec = function(sNum, options) {
		var seperators = {
			decimal: '.',
			thousands: '\u0027'
		};
		return replaceSeparators(sNum, seperators, options);
	};
	var transformForLocale = {
		en: commaThousDotDec,
		it: dotThousCommaDec,
		fr: spaceThousCommaDec,
		de: dotThousCommaDec,
		"de-DE": dotThousCommaDec,
		"de-AT": dotThousCommaDec,
		"de-CH": apostrophThousDotDec,
		"de-LI": apostrophThousDotDec,
		"de-BE": dotThousCommaDec,
		"hi-IN": spaceHundredsCommaThousCommaDec,
		"en-IN": spaceHundredsCommaThousCommaDec,
		ro: dotThousCommaDec,
		"ro-RO": dotThousCommaDec,
		hu: spaceThousCommaDec,
		"hu-HU": spaceThousCommaDec,
		"da-DK": dotThousCommaDec,
		"nb-NO": spaceThousCommaDec,
		"sv-SE": spaceThousCommaDec
	};
	var currencyFormatMap = {
		en: "pre",
		it: "post",
		fr: "post",
		de: "post",
		pl: "post",
		"es-ES": "post",
		"de-DE": "post",
		"de-AT": "prespace",
		"de-CH": "prespace",
		"de-LI": "post",
		"de-BE": "post",
		ro: "post",
		"ro-RO": "post",
		hu: "post",
		"hu-HU": "post",
		"da-DK": "post",
		"nb-NO": "post",
		"sv-SE": "post"
	};
	var currencySymbols = {
		"afn": "؋",
		"ars": "ARS",
		"awg": "ƒ",
		"aud": "A$",
		"azn": "₼",
		"bsd": "$",
		"bbd": "$",
		"bdt": "BDT",
		"byr": "p.",
		"bzd": "BZ$",
		"bmd": "$",
		"bob": "Bs.",
		"bam": "KM",
		"bwp": "P",
		"bgn": "лв",
		"brl": "R$",
		"bnd": "$",
		"khr": "៛",
		"cad": "CA$",
		"kyd": "$",
		"clp": "CLP",
		"cny": "¥",
		"cop": "$",
		"crc": "₡",
		"hrk": "kn",
		"cup": "₱",
		"czk": "Kč",
		"dkk": "kr.",
		"dop": "RD$",
		"xcd": "$",
		"egp": "£",
		"svc": "$",
		"eek": "kr",
		"eur": "€",
		"fkp": "£",
		"fjd": "$",
		"ghc": "¢",
		"gip": "£",
		"gtq": "Q",
		"ggp": "£",
		"gyd": "$",
		"hnl": "L",
		"hkd": "HK$",
		"huf": "Ft",
		"isk": "kr",
		"inr": "₹",
		"idr": "Rp",
		"irr": "﷼",
		"imp": "£",
		"ils": "₪",
		"jmd": "J$",
		"jpy": "¥",
		"jep": "£",
		"kes": "KSh",
		"kzt": "лв",
		"kpw": "₩",
		"krw": "₩",
		"kgs": "лв",
		"lak": "₭",
		"lvl": "Ls",
		"lbp": "£",
		"lrd": "$",
		"ltl": "Lt",
		"mkd": "ден",
		"myr": "RM",
		"mur": "₨",
		"mxn": "$",
		"mnt": "₮",
		"mzn": "MT",
		"nad": "$",
		"npr": "₨",
		"ang": "ƒ",
		"nzd": "NZ$",
		"nio": "C$",
		"ngn": "₦",
		"nok": "kr",
		"omr": "﷼",
		"pkr": "₨",
		"pab": "B/.",
		"pyg": "Gs",
		"pen": "S/.",
		"php": "₱",
		"pln": "zł",
		"qar": "﷼",
		"ron": "lei",
		"rub": "₽",
		"shp": "£",
		"sar": "﷼",
		"rsd": "Дин.",
		"scr": "₨",
		"sgd": "S$",
		"sbd": "$",
		"sos": "S",
		"zar": "R",
		"lkr": "₨",
		"sek": "kr",
		"chf": "CHF",
		"srd": "$",
		"syp": "£",
		"tzs": "TSh",
		"twd": "NT$",
		"thb": "฿",
		"ttd": "TT$",
		"try": "",
		"trl": "₤",
		"tvd": "$",
		"ugx": "USh",
		"uah": "₴",
		"gbp": "£",
		"usd": "$",
		"uyu": "$U",
		"uzs": "лв",
		"vef": "Bs",
		"vnd": "₫",
		"yer": "﷼",
		"zwd": "Z$"
	};
	var currencyFormats = {
		pre: "{{code}}{{num}}",
		post: "{{num}} {{code}}",
		prespace: "{{code}} {{num}}"
	};
	Number.prototype.toLocaleString = function(locale, options) {
		if(locale && locale.length < 2) throw new RangeError("Invalid language tag: " + locale);
		var sNum;
		if(options && options.minimumFractionDigits !== undefined) {
			sNum = this.toFixed(options.minimumFractionDigits);
		} else {
			sNum = this.toString();
		}
		sNum = mapMatch(transformForLocale, locale)(sNum, options);
		if(options && options.currency && options.style === "currency") {
			var format = currencyFormats[mapMatch(currencyFormatMap, locale)];
			if(options.currencyDisplay === "code") {
				sNum = renderFormat(format, {
					num: sNum,
					code: options.currency.toUpperCase()
				});
			} else {
				sNum = renderFormat(format, {
					num: sNum,
					code: currencySymbols[options.currency.toLowerCase()]
				});
			}
		}
		return '' + sNum;
	};
}());