string.js
1.16 KB
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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')
, Iterator = require('./')
, defineProperty = Object.defineProperty
, StringIterator;
StringIterator = module.exports = function (str) {
if (!(this instanceof StringIterator)) return new StringIterator(str);
str = String(str);
Iterator.call(this, str);
defineProperty(this, '__length__', d('', str.length));
};
if (setPrototypeOf) setPrototypeOf(StringIterator, Iterator);
StringIterator.prototype = Object.create(Iterator.prototype, {
constructor: d(StringIterator),
_next: d(function () {
if (!this.__list__) return;
if (this.__nextIndex__ < this.__length__) return this.__nextIndex__++;
this._unBind();
}),
_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;
}),
toString: d(function () { return '[object String Iterator]'; })
});