1 | 'use strict';
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2 | var $ = require('../internals/export');
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3 | var createIteratorConstructor = require('../internals/create-iterator-constructor');
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4 | var getPrototypeOf = require('../internals/object-get-prototype-of');
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5 | var setPrototypeOf = require('../internals/object-set-prototype-of');
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6 | var setToStringTag = require('../internals/set-to-string-tag');
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7 | var createNonEnumerableProperty = require('../internals/create-non-enumerable-property');
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8 | var redefine = require('../internals/redefine');
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9 | var wellKnownSymbol = require('../internals/well-known-symbol');
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10 | var IS_PURE = require('../internals/is-pure');
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11 | var Iterators = require('../internals/iterators');
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12 | var IteratorsCore = require('../internals/iterators-core');
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13 |
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14 | var IteratorPrototype = IteratorsCore.IteratorPrototype;
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15 | var BUGGY_SAFARI_ITERATORS = IteratorsCore.BUGGY_SAFARI_ITERATORS;
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16 | var ITERATOR = wellKnownSymbol('iterator');
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17 | var KEYS = 'keys';
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18 | var VALUES = 'values';
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19 | var ENTRIES = 'entries';
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20 |
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21 | var returnThis = function () { return this; };
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22 |
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23 | module.exports = function (Iterable, NAME, IteratorConstructor, next, DEFAULT, IS_SET, FORCED) {
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24 | createIteratorConstructor(IteratorConstructor, NAME, next);
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25 |
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26 | var getIterationMethod = function (KIND) {
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27 | if (KIND === DEFAULT && defaultIterator) return defaultIterator;
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28 | if (!BUGGY_SAFARI_ITERATORS && KIND in IterablePrototype) return IterablePrototype[KIND];
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29 | switch (KIND) {
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30 | case KEYS: return function keys() { return new IteratorConstructor(this, KIND); };
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31 | case VALUES: return function values() { return new IteratorConstructor(this, KIND); };
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32 | case ENTRIES: return function entries() { return new IteratorConstructor(this, KIND); };
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33 | } return function () { return new IteratorConstructor(this); };
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34 | };
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35 |
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36 | var TO_STRING_TAG = NAME + ' Iterator';
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37 | var INCORRECT_VALUES_NAME = false;
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38 | var IterablePrototype = Iterable.prototype;
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39 | var nativeIterator = IterablePrototype[ITERATOR]
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40 | || IterablePrototype['@@iterator']
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41 | || DEFAULT && IterablePrototype[DEFAULT];
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42 | var defaultIterator = !BUGGY_SAFARI_ITERATORS && nativeIterator || getIterationMethod(DEFAULT);
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43 | var anyNativeIterator = NAME == 'Array' ? IterablePrototype.entries || nativeIterator : nativeIterator;
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44 | var CurrentIteratorPrototype, methods, KEY;
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45 |
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46 | // fix native
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47 | if (anyNativeIterator) {
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48 | CurrentIteratorPrototype = getPrototypeOf(anyNativeIterator.call(new Iterable()));
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49 | if (IteratorPrototype !== Object.prototype && CurrentIteratorPrototype.next) {
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50 | if (!IS_PURE && getPrototypeOf(CurrentIteratorPrototype) !== IteratorPrototype) {
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51 | if (setPrototypeOf) {
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52 | setPrototypeOf(CurrentIteratorPrototype, IteratorPrototype);
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53 | } else if (typeof CurrentIteratorPrototype[ITERATOR] != 'function') {
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54 | createNonEnumerableProperty(CurrentIteratorPrototype, ITERATOR, returnThis);
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55 | }
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56 | }
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57 | // Set @@toStringTag to native iterators
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58 | setToStringTag(CurrentIteratorPrototype, TO_STRING_TAG, true, true);
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59 | if (IS_PURE) Iterators[TO_STRING_TAG] = returnThis;
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60 | }
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61 | }
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62 |
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63 | // fix Array.prototype.{ values, @@iterator }.name in V8 / FF
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64 | if (DEFAULT == VALUES && nativeIterator && nativeIterator.name !== VALUES) {
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65 | INCORRECT_VALUES_NAME = true;
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66 | defaultIterator = function values() { return nativeIterator.call(this); };
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67 | }
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68 |
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69 | // define iterator
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70 | if ((!IS_PURE || FORCED) && IterablePrototype[ITERATOR] !== defaultIterator) {
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71 | createNonEnumerableProperty(IterablePrototype, ITERATOR, defaultIterator);
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72 | }
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73 | Iterators[NAME] = defaultIterator;
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74 |
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75 | // export additional methods
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76 | if (DEFAULT) {
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77 | methods = {
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78 | values: getIterationMethod(VALUES),
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79 | keys: IS_SET ? defaultIterator : getIterationMethod(KEYS),
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80 | entries: getIterationMethod(ENTRIES)
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81 | };
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82 | if (FORCED) for (KEY in methods) {
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83 | if (BUGGY_SAFARI_ITERATORS || INCORRECT_VALUES_NAME || !(KEY in IterablePrototype)) {
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84 | redefine(IterablePrototype, KEY, methods[KEY]);
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85 | }
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86 | } else $({ target: NAME, proto: true, forced: BUGGY_SAFARI_ITERATORS || INCORRECT_VALUES_NAME }, methods);
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87 | }
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88 |
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89 | return methods;
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90 | };
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