'use strict';
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var aCallable = require('../internals/a-callable');
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var anObject = require('../internals/an-object');
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var create = require('../internals/object-create');
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var createNonEnumerableProperty = require('../internals/create-non-enumerable-property');
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var redefineAll = require('../internals/redefine-all');
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var wellKnownSymbol = require('../internals/well-known-symbol');
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var InternalStateModule = require('../internals/internal-state');
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var getMethod = require('../internals/get-method');
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var IteratorPrototype = require('../internals/iterators-core').IteratorPrototype;
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var setInternalState = InternalStateModule.set;
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var getInternalState = InternalStateModule.get;
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var TO_STRING_TAG = wellKnownSymbol('toStringTag');
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module.exports = function (nextHandler, IS_ITERATOR) {
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var IteratorProxy = function Iterator(state) {
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state.next = aCallable(state.iterator.next);
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state.done = false;
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state.ignoreArg = !IS_ITERATOR;
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setInternalState(this, state);
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};
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IteratorProxy.prototype = redefineAll(create(IteratorPrototype), {
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next: function next(arg) {
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var state = getInternalState(this);
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var args = arguments.length ? [state.ignoreArg ? undefined : arg] : IS_ITERATOR ? [] : [undefined];
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state.ignoreArg = false;
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var result = state.done ? undefined : nextHandler.call(state, args);
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return { done: state.done, value: result };
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},
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'return': function (value) {
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var state = getInternalState(this);
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var iterator = state.iterator;
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state.done = true;
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var $$return = getMethod(iterator, 'return');
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return { done: true, value: $$return ? anObject($$return.call(iterator, value)).value : value };
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},
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'throw': function (value) {
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var state = getInternalState(this);
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var iterator = state.iterator;
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state.done = true;
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var $$throw = getMethod(iterator, 'throw');
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if ($$throw) return $$throw.call(iterator, value);
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throw value;
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}
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});
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if (!IS_ITERATOR) {
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createNonEnumerableProperty(IteratorProxy.prototype, TO_STRING_TAG, 'Generator');
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}
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return IteratorProxy;
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};
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