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LibJS: Add spec comments to WeakSetConstructor

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Linus Groh 2023-04-12 23:15:53 +02:00
parent 77fc05afd6
commit bccffed7e9
1 changed files with 23 additions and 7 deletions
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30
Userland/Libraries/LibJS/Runtime/WeakSetConstructor.cpp
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@ -35,6 +35,8 @@ ThrowCompletionOr<void> WeakSetConstructor::initialize(Realm& realm)
ThrowCompletionOr<Value> WeakSetConstructor::call() ThrowCompletionOr<Value> WeakSetConstructor::call()
{ {
auto& vm = this->vm(); auto& vm = this->vm();
// 1. If NewTarget is undefined, throw a TypeError exception.
return vm.throw_completion<TypeError>(ErrorType::ConstructorWithoutNew, vm.names.WeakSet); return vm.throw_completion<TypeError>(ErrorType::ConstructorWithoutNew, vm.names.WeakSet);
} }
@ -42,22 +44,36 @@ ThrowCompletionOr<Value> WeakSetConstructor::call()
ThrowCompletionOr<NonnullGCPtr<Object>> WeakSetConstructor::construct(FunctionObject& new_target) ThrowCompletionOr<NonnullGCPtr<Object>> WeakSetConstructor::construct(FunctionObject& new_target)
{ {
auto& vm = this->vm(); auto& vm = this->vm();
auto iterable = vm.argument(0);
auto weak_set = TRY(ordinary_create_from_constructor<WeakSet>(vm, new_target, &Intrinsics::weak_set_prototype)); // 2. Let set be ? OrdinaryCreateFromConstructor(NewTarget, "%WeakSet.prototype%", « [[WeakSetData]] »).
// 3. Set set.[[WeakSetData]] to a new empty List.
auto set = TRY(ordinary_create_from_constructor<WeakSet>(vm, new_target, &Intrinsics::weak_set_prototype));
if (vm.argument(0).is_nullish()) // 4. If iterable is either undefined or null, return set.
return weak_set; if (iterable.is_nullish())
return set;
auto adder = TRY(weak_set->get(vm.names.add)); // 5. Let adder be ? Get(set, "add").
auto adder = TRY(set->get(vm.names.add));
// 6. If IsCallable(adder) is false, throw a TypeError exception.
if (!adder.is_function()) if (!adder.is_function())
return vm.throw_completion<TypeError>(ErrorType::NotAFunction, "'add' property of WeakSet"); return vm.throw_completion<TypeError>(ErrorType::NotAFunction, "'add' property of WeakSet");
(void)TRY(get_iterator_values(vm, vm.argument(0), [&](Value iterator_value) -> Optional<Completion> { // 7. Let iteratorRecord be ? GetIterator(iterable, sync).
TRY(JS::call(vm, adder.as_function(), weak_set, iterator_value)); // 8. Repeat,
// a. Let next be ? IteratorStep(iteratorRecord).
// c. Let nextValue be ? IteratorValue(next).
(void)TRY(get_iterator_values(vm, iterable, [&](Value next_value) -> Optional<Completion> {
// d. Let status be Completion(Call(adder, set, « nextValue »)).
// e. IfAbruptCloseIterator(status, iteratorRecord).
TRY(JS::call(vm, adder.as_function(), set, next_value));
return {}; return {};
})); }));
return weak_set; // b. If next is false, return set.
return set;
} }
} }