'use strict';
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var call = require('../internals/function-call');
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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 defineBuiltIns = require('../internals/define-built-ins');
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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 getBuiltIn = require('../internals/get-built-in');
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var getMethod = require('../internals/get-method');
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var AsyncIteratorPrototype = require('../internals/async-iterator-prototype');
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var Promise = getBuiltIn('Promise');
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var ASYNC_ITERATOR_PROXY = 'AsyncIteratorProxy';
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var setInternalState = InternalStateModule.set;
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var getInternalState = InternalStateModule.getterFor(ASYNC_ITERATOR_PROXY);
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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 AsyncIteratorProxy = function AsyncIterator(state) {
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state.type = ASYNC_ITERATOR_PROXY;
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state.next = aCallable(state.iterator.next);
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state.done = false;
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state.ignoreArgument = !IS_ITERATOR;
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setInternalState(this, state);
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};
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AsyncIteratorProxy.prototype = defineBuiltIns(create(AsyncIteratorPrototype), {
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next: function next(arg) {
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var that = this;
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var hasArgument = !!arguments.length;
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return new Promise(function (resolve) {
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var state = getInternalState(that);
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var args = hasArgument ? [state.ignoreArgument ? undefined : arg] : IS_ITERATOR ? [] : [undefined];
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state.ignoreArgument = false;
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resolve(state.done ? { done: true, value: undefined } : anObject(call(nextHandler, state, Promise, args)));
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});
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},
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'return': function (value) {
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var that = this;
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return new Promise(function (resolve, reject) {
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var state = getInternalState(that);
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var iterator = state.iterator;
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state.done = true;
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var $$return = getMethod(iterator, 'return');
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if ($$return === undefined) return resolve({ done: true, value: value });
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Promise.resolve(call($$return, iterator, value)).then(function (result) {
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anObject(result);
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resolve({ done: true, value: value });
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}, reject);
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});
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},
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'throw': function (value) {
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var that = this;
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return new Promise(function (resolve, reject) {
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var state = getInternalState(that);
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var iterator = state.iterator;
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state.done = true;
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var $$throw = getMethod(iterator, 'throw');
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if ($$throw === undefined) return reject(value);
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resolve(call($$throw, iterator, value));
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});
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}
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});
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if (!IS_ITERATOR) {
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createNonEnumerableProperty(AsyncIteratorProxy.prototype, TO_STRING_TAG, 'Generator');
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}
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return AsyncIteratorProxy;
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};
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