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39 lines
1.3 KiB
39 lines
1.3 KiB
// 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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