90 lines
3.9 KiB
JavaScript
90 lines
3.9 KiB
JavaScript
'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 getPrototypeOf = require('../internals/object-get-prototype-of');
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var setPrototypeOf = require('../internals/object-set-prototype-of');
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var setToStringTag = require('../internals/set-to-string-tag');
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var createNonEnumerableProperty = require('../internals/create-non-enumerable-property');
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var redefine = require('../internals/redefine');
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var wellKnownSymbol = require('../internals/well-known-symbol');
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var IS_PURE = require('../internals/is-pure');
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var Iterators = require('../internals/iterators');
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var IteratorsCore = require('../internals/iterators-core');
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var IteratorPrototype = IteratorsCore.IteratorPrototype;
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var BUGGY_SAFARI_ITERATORS = IteratorsCore.BUGGY_SAFARI_ITERATORS;
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var ITERATOR = wellKnownSymbol('iterator');
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var KEYS = 'keys';
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var VALUES = 'values';
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var ENTRIES = 'entries';
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var returnThis = function () { return this; };
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module.exports = function (Iterable, NAME, IteratorConstructor, next, DEFAULT, IS_SET, FORCED) {
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createIteratorConstructor(IteratorConstructor, NAME, next);
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var getIterationMethod = function (KIND) {
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if (KIND === DEFAULT && defaultIterator) return defaultIterator;
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if (!BUGGY_SAFARI_ITERATORS && KIND in IterablePrototype) return IterablePrototype[KIND];
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switch (KIND) {
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case KEYS: return function keys() { return new IteratorConstructor(this, KIND); };
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case VALUES: return function values() { return new IteratorConstructor(this, KIND); };
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case ENTRIES: return function entries() { return new IteratorConstructor(this, KIND); };
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} return function () { return new IteratorConstructor(this); };
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};
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var TO_STRING_TAG = NAME + ' Iterator';
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var INCORRECT_VALUES_NAME = false;
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var IterablePrototype = Iterable.prototype;
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var nativeIterator = IterablePrototype[ITERATOR]
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|| IterablePrototype['@@iterator']
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|| DEFAULT && IterablePrototype[DEFAULT];
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var defaultIterator = !BUGGY_SAFARI_ITERATORS && nativeIterator || getIterationMethod(DEFAULT);
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var anyNativeIterator = NAME == 'Array' ? IterablePrototype.entries || nativeIterator : nativeIterator;
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var CurrentIteratorPrototype, methods, KEY;
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// fix native
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if (anyNativeIterator) {
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CurrentIteratorPrototype = getPrototypeOf(anyNativeIterator.call(new Iterable()));
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if (IteratorPrototype !== Object.prototype && CurrentIteratorPrototype.next) {
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if (!IS_PURE && getPrototypeOf(CurrentIteratorPrototype) !== IteratorPrototype) {
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if (setPrototypeOf) {
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setPrototypeOf(CurrentIteratorPrototype, IteratorPrototype);
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} else if (typeof CurrentIteratorPrototype[ITERATOR] != 'function') {
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createNonEnumerableProperty(CurrentIteratorPrototype, ITERATOR, returnThis);
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}
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}
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// Set @@toStringTag to native iterators
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setToStringTag(CurrentIteratorPrototype, TO_STRING_TAG, true, true);
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if (IS_PURE) Iterators[TO_STRING_TAG] = returnThis;
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}
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}
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// fix Array#{values, @@iterator}.name in V8 / FF
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if (DEFAULT == VALUES && nativeIterator && nativeIterator.name !== VALUES) {
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INCORRECT_VALUES_NAME = true;
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defaultIterator = function values() { return nativeIterator.call(this); };
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}
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// define iterator
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if ((!IS_PURE || FORCED) && IterablePrototype[ITERATOR] !== defaultIterator) {
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createNonEnumerableProperty(IterablePrototype, ITERATOR, defaultIterator);
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}
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Iterators[NAME] = defaultIterator;
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// export additional methods
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if (DEFAULT) {
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methods = {
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values: getIterationMethod(VALUES),
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keys: IS_SET ? defaultIterator : getIterationMethod(KEYS),
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entries: getIterationMethod(ENTRIES)
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};
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if (FORCED) for (KEY in methods) {
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if (BUGGY_SAFARI_ITERATORS || INCORRECT_VALUES_NAME || !(KEY in IterablePrototype)) {
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redefine(IterablePrototype, KEY, methods[KEY]);
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}
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} else $({ target: NAME, proto: true, forced: BUGGY_SAFARI_ITERATORS || INCORRECT_VALUES_NAME }, methods);
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}
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return methods;
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};
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