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64 lines
2.4 KiB
64 lines
2.4 KiB
3 years ago
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'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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