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codeql-action/node_modules/es-abstract/2018/CreateAsyncFromSyncIterator.js
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'use strict'; | |
var GetIntrinsic = require('get-intrinsic'); | |
var $SyntaxError = GetIntrinsic('%SyntaxError%'); | |
var $TypeError = GetIntrinsic('%TypeError%'); | |
var $Promise = GetIntrinsic('%Promise%', true); | |
var Call = require('./Call'); | |
var CreateIterResultObject = require('./CreateIterResultObject'); | |
var Get = require('./Get'); | |
var GetMethod = require('./GetMethod'); | |
var IteratorComplete = require('./IteratorComplete'); | |
var IteratorNext = require('./IteratorNext'); | |
var IteratorValue = require('./IteratorValue'); | |
var ObjectCreate = require('./ObjectCreate'); | |
var PromiseResolve = require('./PromiseResolve'); | |
var Type = require('./Type'); | |
var SLOT = require('internal-slot'); | |
var callBound = require('call-bind/callBound'); | |
var $then = callBound('Promise.prototype.then', true); | |
var assertRecord = require('../helpers/assertRecord'); | |
var AsyncFromSyncIteratorContinuation = function AsyncFromSyncIteratorContinuation(result) { | |
if (Type(result) !== 'Object') { | |
throw new $TypeError('Assertion failed: Type(O) is not Object'); | |
} | |
if (arguments.length > 1) { | |
throw new $TypeError('although AsyncFromSyncIteratorContinuation should take a second argument, it is not used in this implementation'); | |
} | |
if (!$Promise) { | |
throw new $SyntaxError('This environment does not support Promises.'); | |
} | |
return new Promise(function (resolve) { | |
var done = IteratorComplete(result); // step 2 | |
var value = IteratorValue(result); // step 4 | |
var valueWrapper = PromiseResolve($Promise, value); // step 6 | |
// eslint-disable-next-line no-shadow | |
var onFulfilled = function (value) { // steps 8-9 | |
return CreateIterResultObject(value, done); // step 8.a | |
}; | |
resolve($then(valueWrapper, onFulfilled)); // step 11 | |
}); // step 12 | |
}; | |
var $AsyncFromSyncIteratorPrototype = GetIntrinsic('%AsyncFromSyncIteratorPrototype%', true) || { | |
next: function next(value) { | |
var O = this; // step 1 | |
SLOT.assert(O, '[[SyncIteratorRecord]]'); // step 2 | |
var argsLength = arguments.length; | |
return new Promise(function (resolve) { // step 3 | |
var syncIteratorRecord = SLOT.get(O, '[[SyncIteratorRecord]]'); // step 4 | |
var result; | |
if (argsLength > 0) { | |
result = IteratorNext(syncIteratorRecord['[[Iterator]]'], value); // step 5.a | |
} else { // step 6 | |
result = IteratorNext(syncIteratorRecord['[[Iterator]]']);// step 6.a | |
} | |
resolve(AsyncFromSyncIteratorContinuation(result)); // step 8 | |
}); | |
}, | |
'return': function () { | |
var O = this; // step 1 | |
SLOT.assert(O, '[[SyncIteratorRecord]]'); // step 2 | |
var valueIsPresent = arguments.length > 0; | |
var value = valueIsPresent ? arguments[0] : void undefined; | |
return new Promise(function (resolve, reject) { // step 3 | |
var syncIterator = SLOT.get(O, '[[SyncIteratorRecord]]')['[[Iterator]]']; // step 4 | |
var iteratorReturn = GetMethod(syncIterator, 'return'); // step 5 | |
if (typeof iteratorReturn === 'undefined') { // step 7 | |
var iterResult = CreateIterResultObject(value, true); // step 7.a | |
Call(resolve, undefined, [iterResult]); // step 7.b | |
return; | |
} | |
var result; | |
if (valueIsPresent) { // step 8 | |
result = Call(iteratorReturn, syncIterator, [value]); // step 8.a | |
} else { // step 9 | |
result = Call(iteratorReturn, syncIterator); // step 9.a | |
} | |
if (Type(result) !== 'Object') { // step 11 | |
Call(reject, undefined, [new $TypeError('Iterator `return` method returned a non-object value.')]); // step 11.a | |
return; | |
} | |
resolve(AsyncFromSyncIteratorContinuation(result)); // step 12 | |
}); | |
}, | |
'throw': function () { | |
var O = this; // step 1 | |
SLOT.assert(O, '[[SyncIteratorRecord]]'); // step 2 | |
var valueIsPresent = arguments.length > 0; | |
var value = valueIsPresent ? arguments[0] : void undefined; | |
return new Promise(function (resolve, reject) { // step 3 | |
var syncIterator = SLOT.get(O, '[[SyncIteratorRecord]]')['[[Iterator]]']; // step 4 | |
var throwMethod = GetMethod(syncIterator, 'throw'); // step 5 | |
if (typeof throwMethod === 'undefined') { // step 7 | |
Call(reject, undefined, [value]); // step 7.a | |
return; | |
} | |
var result; | |
if (valueIsPresent) { // step 8 | |
result = Call(throwMethod, syncIterator, [value]); // step 8.a | |
} else { // step 9 | |
result = Call(throwMethod, syncIterator); // step 9.a | |
} | |
if (Type(result) !== 'Object') { // step 11 | |
Call(reject, undefined, [new $TypeError('Iterator `throw` method returned a non-object value.')]); // step 11.a | |
return; | |
} | |
resolve(AsyncFromSyncIteratorContinuation(result/* , promiseCapability */)); // step 12 | |
}); | |
} | |
}; | |
// https://262.ecma-international.org/9.0/#sec-createasyncfromsynciterator | |
module.exports = function CreateAsyncFromSyncIterator(syncIteratorRecord) { | |
assertRecord(Type, 'Iterator Record', 'syncIteratorRecord', syncIteratorRecord); | |
// var asyncIterator = ObjectCreate(%AsyncFromSyncIteratorPrototype%, « [[SyncIteratorRecord]] »); // step 1 | |
var asyncIterator = ObjectCreate($AsyncFromSyncIteratorPrototype); | |
SLOT.set(asyncIterator, '[[SyncIteratorRecord]]', syncIteratorRecord); // step 2 | |
var nextMethod = Get(asyncIterator, 'next'); // step 3 | |
return { // steps 3-4 | |
'[[Iterator]]': asyncIterator, | |
'[[NextMethod]]': nextMethod, | |
'[[Done]]': false | |
}; | |
}; |