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LibJS: Implement Promise.race on the Promise constructor

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Timothy Flynn 2021-08-21 17:12:24 -04:00 • committed by Linus Groh
parent 949f294444
commit 4f186a9a1f
2 changed files with 158 additions and 3 deletions
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45
Userland/Libraries/LibJS/Runtime/PromiseConstructor.cpp
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@ -202,6 +202,21 @@ static Value perform_promise_any(GlobalObject& global_object, Object& iterator_r
});
}
// 27.2.4.5.1 PerformPromiseRace ( iteratorRecord, constructor, resultCapability, promiseResolve ), https://tc39.es/ecma262/#sec-performpromiserace
static Value perform_promise_race(GlobalObject& global_object, Object& iterator_record, Value constructor, PromiseCapability result_capability, Value promise_resolve)
{
auto& vm = global_object.vm();
return perform_promise_common(
global_object, iterator_record, constructor, result_capability, promise_resolve,
[&](PromiseValueList&) -> Value {
return result_capability.promise;
},
[&](PromiseValueList&, RemainingElements&, Value next_promise, size_t) {
(void)next_promise.invoke(global_object, vm.names.then, result_capability.resolve, result_capability.reject);
});
}
PromiseConstructor::PromiseConstructor(GlobalObject& global_object)
: NativeFunction(vm().names.Promise.as_string(), *global_object.function_prototype())
{
@ -219,8 +234,7 @@ void PromiseConstructor::initialize(GlobalObject& global_object)
define_native_function(vm.names.all, all, 1, attr);
define_native_function(vm.names.allSettled, all_settled, 1, attr);
define_native_function(vm.names.any, any, 1, attr);
// TODO: Implement these functions below and uncomment this.
// define_native_function(vm.names.race, race, 1, attr);
define_native_function(vm.names.race, race, 1, attr);
define_native_function(vm.names.reject, reject, 1, attr);
define_native_function(vm.names.resolve, resolve, 1, attr);
@ -360,7 +374,32 @@ JS_DEFINE_NATIVE_FUNCTION(PromiseConstructor::any)
// 27.2.4.5 Promise.race ( iterable ), https://tc39.es/ecma262/#sec-promise.race
JS_DEFINE_NATIVE_FUNCTION(PromiseConstructor::race)
{
TODO();
auto* constructor = vm.this_value(global_object).to_object(global_object);
if (!constructor)
return {};
auto promise_capability = new_promise_capability(global_object, constructor);
if (vm.exception())
return {};
auto promise_resolve = get_promise_resolve(global_object, constructor);
if (auto abrupt = if_abrupt_reject_promise(global_object, promise_resolve, promise_capability); abrupt.has_value())
return abrupt.value();
auto iterator_record = get_iterator(global_object, vm.argument(0));
if (auto abrupt = if_abrupt_reject_promise(global_object, iterator_record, promise_capability); abrupt.has_value())
return abrupt.value();
auto result = perform_promise_race(global_object, *iterator_record, constructor, promise_capability, promise_resolve);
if (vm.exception()) {
if (!iterator_record_is_complete(global_object, *iterator_record))
iterator_close(*iterator_record);
auto abrupt = if_abrupt_reject_promise(global_object, result, promise_capability);
return abrupt.value();
}
return result;
}
// 27.2.4.6 Promise.reject ( r ), https://tc39.es/ecma262/#sec-promise.reject