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63 lines
2.4 KiB
63 lines
2.4 KiB
'use strict'; |
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var apply = require('../internals/function-apply'); |
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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 redefineAll = require('../internals/redefine-all'); |
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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 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({ done: done, value: value }); |
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}, reject); |
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}; |
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var AsyncFromSyncIterator = function AsyncIterator(iterator) { |
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setInternalState(this, { |
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type: ASYNC_FROM_SYNC_ITERATOR, |
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iterator: anObject(iterator), |
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next: iterator.next |
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}); |
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}; |
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AsyncFromSyncIterator.prototype = redefineAll(create(AsyncIteratorPrototype), { |
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next: function next(arg) { |
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var state = getInternalState(this); |
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var hasArg = !!arguments.length; |
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return new Promise(function (resolve, reject) { |
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var result = anObject(apply(state.next, state.iterator, hasArg ? [arg] : [])); |
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asyncFromSyncIteratorContinuation(result, resolve, reject); |
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}); |
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}, |
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'return': function (arg) { |
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var iterator = getInternalState(this).iterator; |
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var hasArg = !!arguments.length; |
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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({ done: true, value: arg }); |
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var result = anObject(apply($return, iterator, hasArg ? [arg] : [])); |
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asyncFromSyncIteratorContinuation(result, resolve, reject); |
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}); |
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}, |
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'throw': function (arg) { |
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var iterator = getInternalState(this).iterator; |
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var hasArg = !!arguments.length; |
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return new Promise(function (resolve, reject) { |
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var $throw = getMethod(iterator, 'throw'); |
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if ($throw === undefined) return reject(arg); |
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var result = anObject(apply($throw, iterator, hasArg ? [arg] : [])); |
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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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