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39 lines
1.4 KiB
39 lines
1.4 KiB
4 years ago
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'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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