2 var path = require('../internals/path');
3 var aFunction = require('../internals/a-function');
4 var anObject = require('../internals/an-object');
5 var create = require('../internals/object-create');
6 var createNonEnumerableProperty = require('../internals/create-non-enumerable-property');
7 var redefineAll = require('../internals/redefine-all');
8 var wellKnownSymbol = require('../internals/well-known-symbol');
9 var InternalStateModule = require('../internals/internal-state');
11 var setInternalState = InternalStateModule.set;
12 var getInternalState = InternalStateModule.get;
14 var TO_STRING_TAG = wellKnownSymbol('toStringTag');
16 var $return = function (value) {
17 var iterator = getInternalState(this).iterator;
18 var $$return = iterator['return'];
19 return $$return === undefined ? { done: true, value: value } : anObject($$return.call(iterator, value));
22 var $throw = function (value) {
23 var iterator = getInternalState(this).iterator;
24 var $$throw = iterator['throw'];
25 if ($$throw === undefined) throw value;
26 return $$throw.call(iterator, value);
29 module.exports = function (nextHandler, IS_ITERATOR) {
30 var IteratorProxy = function Iterator(state) {
31 state.next = aFunction(state.iterator.next);
33 setInternalState(this, state);
36 IteratorProxy.prototype = redefineAll(create(path.Iterator.prototype), {
37 next: function next() {
38 var state = getInternalState(this);
39 var result = state.done ? undefined : nextHandler.apply(state, arguments);
40 return { done: state.done, value: result };
47 createNonEnumerableProperty(IteratorProxy.prototype, TO_STRING_TAG, 'Generator');