punycode2/to-ascii.js

Modular version of punycode package

"use strict";

var mapDomain     = require("./lib/map-domain")
  , encode        = require("./encode")
  , regexNonASCII = /[^\x20-\x7E]/; // unprintable ASCII chars + non-ASCII chars

/**
 * Converts a Unicode string representing a domain name or an email address to
 * Punycode. Only the non-ASCII parts of the domain name will be converted,
 * i.e. it doesn't matter if you call it with a domain that's already in
 * ASCII.
 * @memberOf punycode
 * @param {String} input The domain name or email address to convert, as a
 * Unicode string.
 * @returns {String} The Punycode representation of the given domain name or
 * email address.
 */
module.exports = function (input) {
	return mapDomain(input, function (string) {
		return regexNonASCII.test(string) ? "xn--" + encode(string) : string;
	});
};