punycode2/lib/map-domain.js

Modular version of punycode package

"use strict";

var regexSeparators = /[\x2E\u3002\uFF0E\uFF61]/g; // RFC 3490 separators

/**
 * A simple `Array#map`-like wrapper to work with domain name strings or email
 * addresses.
 * @private
 * @param {String} domain The domain name or email address.
 * @param {Function} callback The function that gets called for every
 * character.
 * @returns {Array} A new string of characters returned by the callback
 * function.
 */
module.exports = function (string, fn) {
	var parts = string.split("@");
	var result = "";
	if (parts.length > 1) {
		// In email addresses, only the domain name should be punycoded. Leave
		// the local part (i.e. everything up to `@`) intact.
		result = parts[0] + "@";
		string = parts[1];
	}
	// Avoid `split(regex)` for IE8 compatibility. See #17.
	string = string.replace(regexSeparators, ".");
	var labels = string.split(".");
	var encoded = labels.map(fn).join(".");
	return result + encoded;
};