50 lines
1.9 KiB
JavaScript
50 lines
1.9 KiB
JavaScript
'use strict';
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var call = require('../internals/function-call');
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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 getMethod = require('../internals/get-method');
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var defineBuiltIns = require('../internals/define-built-ins');
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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 AsyncIteratorPrototype = require('../internals/async-iterator-prototype');
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var createIterResultObject = require('../internals/create-iter-result-object');
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var Promise = getBuiltIn('Promise');
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var ASYNC_FROM_SYNC_ITERATOR = 'AsyncFromSyncIterator';
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var setInternalState = InternalStateModule.set;
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var getInternalState = InternalStateModule.getterFor(ASYNC_FROM_SYNC_ITERATOR);
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var asyncFromSyncIteratorContinuation = function (result, resolve, reject) {
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var done = result.done;
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Promise.resolve(result.value).then(function (value) {
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resolve(createIterResultObject(value, done));
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}, reject);
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};
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var AsyncFromSyncIterator = function AsyncIterator(iteratorRecord) {
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iteratorRecord.type = ASYNC_FROM_SYNC_ITERATOR;
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setInternalState(this, iteratorRecord);
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};
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AsyncFromSyncIterator.prototype = defineBuiltIns(create(AsyncIteratorPrototype), {
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next: function next() {
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var state = getInternalState(this);
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return new Promise(function (resolve, reject) {
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var result = anObject(call(state.next, state.iterator));
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asyncFromSyncIteratorContinuation(result, resolve, reject);
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});
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},
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'return': function () {
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var iterator = getInternalState(this).iterator;
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return new Promise(function (resolve, reject) {
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var $return = getMethod(iterator, 'return');
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if ($return === undefined) return resolve(createIterResultObject(undefined, true));
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var result = anObject(call($return, iterator));
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asyncFromSyncIteratorContinuation(result, resolve, reject);
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});
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}
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});
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module.exports = AsyncFromSyncIterator;
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