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38 lines
1.4 KiB
38 lines
1.4 KiB
'use strict'; |
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var $ = require('../internals/export'); |
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var createIteratorConstructor = require('../internals/create-iterator-constructor'); |
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var requireObjectCoercible = require('../internals/require-object-coercible'); |
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var InternalStateModule = require('../internals/internal-state'); |
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var StringMultibyteModule = require('../internals/string-multibyte'); |
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var codeAt = StringMultibyteModule.codeAt; |
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var charAt = StringMultibyteModule.charAt; |
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var STRING_ITERATOR = 'String Iterator'; |
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var setInternalState = InternalStateModule.set; |
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var getInternalState = InternalStateModule.getterFor(STRING_ITERATOR); |
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// TODO: unify with String#@@iterator |
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var $StringIterator = createIteratorConstructor(function StringIterator(string) { |
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setInternalState(this, { |
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type: STRING_ITERATOR, |
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string: string, |
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index: 0 |
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}); |
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}, 'String', function next() { |
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var state = getInternalState(this); |
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var string = state.string; |
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var index = state.index; |
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var point; |
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if (index >= string.length) return { value: undefined, done: true }; |
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point = charAt(string, index); |
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state.index += point.length; |
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return { value: { codePoint: codeAt(point, 0), position: index }, done: false }; |
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}); |
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// `String.prototype.codePoints` method |
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// https://github.com/tc39/proposal-string-prototype-codepoints |
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$({ target: 'String', proto: true }, { |
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codePoints: function codePoints() { |
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return new $StringIterator(String(requireObjectCoercible(this))); |
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} |
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});
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