1 | 'use strict';
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2 | var path = require('../internals/path');
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3 | var aFunction = require('../internals/a-function');
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4 | var anObject = require('../internals/an-object');
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5 | var create = require('../internals/object-create');
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6 | var createNonEnumerableProperty = require('../internals/create-non-enumerable-property');
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7 | var redefineAll = require('../internals/redefine-all');
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8 | var wellKnownSymbol = require('../internals/well-known-symbol');
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9 | var InternalStateModule = require('../internals/internal-state');
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10 |
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11 | var setInternalState = InternalStateModule.set;
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12 | var getInternalState = InternalStateModule.get;
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13 |
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14 | var TO_STRING_TAG = wellKnownSymbol('toStringTag');
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15 |
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16 | var $return = function (value) {
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17 | var iterator = getInternalState(this).iterator;
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18 | var $$return = iterator['return'];
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19 | return $$return === undefined ? { done: true, value: value } : anObject($$return.call(iterator, value));
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20 | };
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21 |
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22 | var $throw = function (value) {
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23 | var iterator = getInternalState(this).iterator;
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24 | var $$throw = iterator['throw'];
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25 | if ($$throw === undefined) throw value;
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26 | return $$throw.call(iterator, value);
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27 | };
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28 |
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29 | module.exports = function (nextHandler, IS_ITERATOR) {
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30 | var IteratorProxy = function Iterator(state) {
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31 | state.next = aFunction(state.iterator.next);
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32 | state.done = false;
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33 | setInternalState(this, state);
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34 | };
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35 |
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36 | IteratorProxy.prototype = redefineAll(create(path.Iterator.prototype), {
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37 | next: function next() {
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38 | var state = getInternalState(this);
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39 | var result = state.done ? undefined : nextHandler.apply(state, arguments);
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40 | return { done: state.done, value: result };
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41 | },
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42 | 'return': $return,
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43 | 'throw': $throw
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44 | });
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45 |
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46 | if (!IS_ITERATOR) {
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47 | createNonEnumerableProperty(IteratorProxy.prototype, TO_STRING_TAG, 'Generator');
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48 | }
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49 |
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50 | return IteratorProxy;
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51 | };
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