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LibJS: Add spec comments to SetConstructor
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1 changed files with 21 additions and 3 deletions
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@ -37,6 +37,8 @@ ThrowCompletionOr<void> SetConstructor::initialize(Realm& realm)
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ThrowCompletionOr<Value> SetConstructor::call()
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{
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auto& vm = this->vm();
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// 1. If NewTarget is undefined, throw a TypeError exception.
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return vm.throw_completion<TypeError>(ErrorType::ConstructorWithoutNew, vm.names.Set);
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}
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@ -44,27 +46,43 @@ ThrowCompletionOr<Value> SetConstructor::call()
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ThrowCompletionOr<NonnullGCPtr<Object>> SetConstructor::construct(FunctionObject& new_target)
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{
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auto& vm = this->vm();
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auto iterable = vm.argument(0);
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// 2. Let set be ? OrdinaryCreateFromConstructor(NewTarget, "%Set.prototype%", « [[SetData]] »).
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auto set = TRY(ordinary_create_from_constructor<Set>(vm, new_target, &Intrinsics::set_prototype));
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if (vm.argument(0).is_nullish())
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// 3. Set set.[[SetData]] to a new empty List.
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// 4. If iterable is either undefined or null, return set.
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if (iterable.is_nullish())
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return set;
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// 5. Let adder be ? Get(set, "add").
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auto adder = TRY(set->get(vm.names.add));
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// 6. If IsCallable(adder) is false, throw a TypeError exception.
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if (!adder.is_function())
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return vm.throw_completion<TypeError>(ErrorType::NotAFunction, "'add' property of Set");
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(void)TRY(get_iterator_values(vm, vm.argument(0), [&](Value iterator_value) -> Optional<Completion> {
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TRY(JS::call(vm, adder.as_function(), set, iterator_value));
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// 7. Let iteratorRecord be ? GetIterator(iterable, sync).
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// 8. Repeat,
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// a. Let next be ? IteratorStep(iteratorRecord).
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// c. Let nextValue be ? IteratorValue(next).
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(void)TRY(get_iterator_values(vm, iterable, [&](Value next_value) -> Optional<Completion> {
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// d. Let status be Completion(Call(adder, set, « nextValue »)).
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// e. IfAbruptCloseIterator(status, iteratorRecord).
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TRY(JS::call(vm, adder.as_function(), set, next_value));
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return {};
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}));
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// b. If next is false, return set.
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return set;
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}
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// 24.2.2.2 get Set [ @@species ], https://tc39.es/ecma262/#sec-get-set-@@species
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JS_DEFINE_NATIVE_FUNCTION(SetConstructor::symbol_species_getter)
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{
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// 1. Return the this value.
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return vm.this_value();
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}
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