UNPKG

1.97 kBJavaScriptView Raw
1'use strict';
2var call = require('../internals/function-call');
3var anObject = require('../internals/an-object');
4var create = require('../internals/object-create');
5var getMethod = require('../internals/get-method');
6var defineBuiltIns = require('../internals/define-built-ins');
7var InternalStateModule = require('../internals/internal-state');
8var getBuiltIn = require('../internals/get-built-in');
9var AsyncIteratorPrototype = require('../internals/async-iterator-prototype');
10var createIterResultObject = require('../internals/create-iter-result-object');
11
12var Promise = getBuiltIn('Promise');
13
14var ASYNC_FROM_SYNC_ITERATOR = 'AsyncFromSyncIterator';
15var setInternalState = InternalStateModule.set;
16var getInternalState = InternalStateModule.getterFor(ASYNC_FROM_SYNC_ITERATOR);
17
18var asyncFromSyncIteratorContinuation = function (result, resolve, reject) {
19 var done = result.done;
20 Promise.resolve(result.value).then(function (value) {
21 resolve(createIterResultObject(value, done));
22 }, reject);
23};
24
25var AsyncFromSyncIterator = function AsyncIterator(iteratorRecord) {
26 iteratorRecord.type = ASYNC_FROM_SYNC_ITERATOR;
27 setInternalState(this, iteratorRecord);
28};
29
30AsyncFromSyncIterator.prototype = defineBuiltIns(create(AsyncIteratorPrototype), {
31 next: function next() {
32 var state = getInternalState(this);
33 return new Promise(function (resolve, reject) {
34 var result = anObject(call(state.next, state.iterator));
35 asyncFromSyncIteratorContinuation(result, resolve, reject);
36 });
37 },
38 'return': function () {
39 var iterator = getInternalState(this).iterator;
40 return new Promise(function (resolve, reject) {
41 var $return = getMethod(iterator, 'return');
42 if ($return === undefined) return resolve(createIterResultObject(undefined, true));
43 var result = anObject(call($return, iterator));
44 asyncFromSyncIteratorContinuation(result, resolve, reject);
45 });
46 }
47});
48
49module.exports = AsyncFromSyncIterator;