polyfill-service/polyfills/_StringIterator/polyfill.js

A polyfill combinator

// A modification of https://github.com/medikoo/es6-iterator
// Copyright (C) 2013-2015 Mariusz Nowak (www.medikoo.com)

/* global Iterator */

var StringIterator = (function() { // eslint-disable-line no-unused-vars

	var StringIterator = function (str) {
		if (!(this instanceof StringIterator)) return new StringIterator(str);
		str = String(str);
		Iterator.call(this, str);
		Object.defineProperty(this, '__length__', {
			value: str.length,
			configurable: false,
			enumerable: false,
			writable: false
		});
	};
	if (Object.setPrototypeOf) Object.setPrototypeOf(StringIterator, Iterator);

	StringIterator.prototype = Object.create(Iterator.prototype, {
		constructor: {
			value: StringIterator,
			configurable: true,
			enumerable: false,
			writable: true
		},
		_next: {
			value: function() {
				if (!this.__list__) return;
				if (this.__nextIndex__ < this.__length__) return this.__nextIndex__++;
				this._unBind();
			},
			configurable: true,
			enumerable: false,
			writable: true
		},
		_resolve: {
			value: function (i) {
				var char = this.__list__[i], code;
				if (this.__nextIndex__ === this.__length__) return char;
				code = char.charCodeAt(0);
				if ((code >= 0xD800) && (code <= 0xDBFF)) return char + this.__list__[this.__nextIndex__++];
				return char;
			},
			configurable: true,
			enumerable: false,
			writable: true
		},
		toString: {
			value: function() {
				return '[object String Iterator]';
			},
			configurable: true,
			enumerable: false,
			writable: true
		}
	});

	return StringIterator;
}());