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