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// Thanks @mathiasbynens
// http://mathiasbynens.be/notes/javascript-unicode#iterating-over-symbols

"use strict";

var setPrototypeOf = require("es5-ext/object/set-prototype-of")
  , d              = require("d")
  , Symbol         = require("es6-symbol")
  , Iterator       = require("./");

var defineProperty = Object.defineProperty, StringIterator;

StringIterator = module.exports = function (str) {
	if (!(this instanceof StringIterator)) throw new TypeError("Constructor requires 'new'");
	str = String(str);
	Iterator.call(this, str);
	defineProperty(this, "__length__", d("", str.length));
};
if (setPrototypeOf) setPrototypeOf(StringIterator, Iterator);

// Internal %ArrayIteratorPrototype% doesn't expose its constructor
delete StringIterator.prototype.constructor;

StringIterator.prototype = Object.create(Iterator.prototype, {
	_next: d(function () {
		if (!this.__list__) return undefined;
		if (this.__nextIndex__ < this.__length__) return this.__nextIndex__++;
		this._unBind();
		return undefined;
	}),
	_resolve: d(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;
	})
});
defineProperty(StringIterator.prototype, Symbol.toStringTag, d("c", "String Iterator"));