khong-dau/lib/khongdau.js

Convert Vietnamese characters to Latin characters

const sanitize = require('sanitize-filename');

function KhongDau(str, rules){
	if (typeof str != 'string')
		return null;

	 rules = rules || ["chuyen"]

	 for (var i = 0; i < rules.length; i++)
	 	switch (rules[i]){
			case "chuyen":
				str = KhongDau.c(str);
				break;
			case "url":
				str = KhongDau.cURI(str);
				break;
			case "file":
				str = sanitize(str);
				break;
		}

	return str;
}

KhongDau.c = function(str){
	if (typeof str != 'string')
		return null;

	str = str.replace(/(á|à|ả|ã|ạ|ă|ắ|ằ|ẳ|ẵ|ặ|â|ấ|ầ|ẩ|ẫ|ậ)/g, 'a');
	str = str.replace(/(A|À|Ả|Ã|Ạ|Ă|Ắ|Ằ|Ẳ|Ẵ|Ặ|Â|Ấ|Ầ|Ẩ|Ẫ|Ậ)/g, 'A');
	str = str.replace(/đ/g, 'd');
	str = str.replace(/Đ/g, 'D');
	str = str.replace(/(é|è|ẻ|ẽ|ẹ|ê|ế|ề|ể|ễ|ệ)/g, 'e');
	str = str.replace(/(É|È|Ẻ|Ẽ|Ẹ|Ê|Ế|Ề|Ể|Ễ|Ệ)/g, 'E');
	str = str.replace(/(í|ì|ỉ|ĩ|ị)/g, 'i');
	str = str.replace(/(Í|Ì|Ỉ|Ĩ|Ị)/g, 'I');
	str = str.replace(/(ó|ò|ỏ|õ|ọ|ô|ố|ồ|ổ|ỗ|ộ|ơ|ớ|ờ|ở|ỡ|ợ)/g, 'o');
	str = str.replace(/(Ó|Ò|Ỏ|Õ|Ọ|Ô|Ố|Ồ|Ổ|Ỗ|Ộ|Ơ|Ớ|Ờ|Ở|Ỡ|Ợ)/g, 'O');
	str = str.replace(/(ú|ù|ủ|ũ|ụ|ư|ứ|ừ|ử|ữ|ự)/g, 'u');
	str = str.replace(/(Ú|Ù|Ủ|Ũ|Ụ|Ư|Ứ|Ừ|Ử|Ữ|Ự)/g, 'U');
	str = str.replace(/(ý|ỳ|ỷ|ỹ|ỵ)/g, 'y');
	str = str.replace(/(Ý|Ỳ|Ỷ|Ỹ|Ỵ)/g, 'Y');

	return str;
};

KhongDau.cLowerCase = function(str){
	return this.c(str).toLowerCase();
};

KhongDau.cUpperCase = function(str){
	return this.c(str).toUpperCase();
};

KhongDau.cURI = function(str){
	str = str.replace(/[^a-zA-Z0-9_-]/g, '-');

	while (str.length > 0 && (/--/g).test(str)){
		str = str.replace(/--/g, '-');
	}

	return str;
}

KhongDau.cFriendlyURI = function(str){
	str = this.cLowerCase(str);

	str = this.cURI(str).toLowerCase();

	return str;
}

// Export if using node
try {module.exports = KhongDau; } catch(e){};