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40 lines
1.3 KiB
40 lines
1.3 KiB
4 years ago
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// Thanks @mathiasbynens
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// http://mathiasbynens.be/notes/javascript-unicode#iterating-over-symbols
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"use strict";
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var setPrototypeOf = require("es5-ext/object/set-prototype-of")
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, d = require("d")
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, Symbol = require("es6-symbol")
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, Iterator = require("./");
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var defineProperty = Object.defineProperty, StringIterator;
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StringIterator = module.exports = function (str) {
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if (!(this instanceof StringIterator)) throw new TypeError("Constructor requires 'new'");
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str = String(str);
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Iterator.call(this, str);
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defineProperty(this, "__length__", d("", str.length));
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};
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if (setPrototypeOf) setPrototypeOf(StringIterator, Iterator);
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// Internal %ArrayIteratorPrototype% doesn't expose its constructor
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delete StringIterator.prototype.constructor;
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StringIterator.prototype = Object.create(Iterator.prototype, {
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_next: d(function () {
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if (!this.__list__) return undefined;
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if (this.__nextIndex__ < this.__length__) return this.__nextIndex__++;
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this._unBind();
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return undefined;
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}),
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_resolve: d(function (i) {
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var char = this.__list__[i], code;
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if (this.__nextIndex__ === this.__length__) return char;
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code = char.charCodeAt(0);
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if (code >= 0xd800 && code <= 0xdbff) return char + this.__list__[this.__nextIndex__++];
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return char;
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})
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});
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defineProperty(StringIterator.prototype, Symbol.toStringTag, d("c", "String Iterator"));
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