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https://github.com/RGBCube/serenity
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b84f8fb55b
Some of these are allocated upon initialization of the intrinsics, and some lazily, but in neither case the getters actually return a nullptr. This saves us a whole bunch of pointer dereferences (as NonnullGCPtr has an `operator T&()`), and also has the interesting side effect of forcing us to explicitly use the FunctionObject& overload of call(), as passing a NonnullGCPtr is ambigous - it could implicitly be turned into a Value _or_ a FunctionObject& (so we have to dereference manually).
79 lines
2.7 KiB
C++
79 lines
2.7 KiB
C++
/*
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* Copyright (c) 2021, Idan Horowitz <idan.horowitz@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <LibJS/Runtime/AbstractOperations.h>
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#include <LibJS/Runtime/Error.h>
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#include <LibJS/Runtime/GlobalObject.h>
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#include <LibJS/Runtime/IteratorOperations.h>
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#include <LibJS/Runtime/WeakSet.h>
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#include <LibJS/Runtime/WeakSetConstructor.h>
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namespace JS {
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WeakSetConstructor::WeakSetConstructor(Realm& realm)
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: NativeFunction(realm.vm().names.WeakSet.as_string(), realm.intrinsics().function_prototype())
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{
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}
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ThrowCompletionOr<void> WeakSetConstructor::initialize(Realm& realm)
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{
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auto& vm = this->vm();
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MUST_OR_THROW_OOM(NativeFunction::initialize(realm));
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// 24.4.2.1 WeakSet.prototype, https://tc39.es/ecma262/#sec-weakset.prototype
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define_direct_property(vm.names.prototype, realm.intrinsics().weak_set_prototype(), 0);
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define_direct_property(vm.names.length, Value(0), Attribute::Configurable);
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return {};
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}
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// 24.4.1.1 WeakSet ( [ iterable ] ), https://tc39.es/ecma262/#sec-weakset-iterable
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ThrowCompletionOr<Value> WeakSetConstructor::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.WeakSet);
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}
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// 24.4.1.1 WeakSet ( [ iterable ] ), https://tc39.es/ecma262/#sec-weakset-iterable
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ThrowCompletionOr<NonnullGCPtr<Object>> WeakSetConstructor::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, "%WeakSet.prototype%", « [[WeakSetData]] »).
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// 3. Set set.[[WeakSetData]] to a new empty List.
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auto set = TRY(ordinary_create_from_constructor<WeakSet>(vm, new_target, &Intrinsics::weak_set_prototype));
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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 WeakSet");
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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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}
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