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
2.8 KiB
C++
79 lines
2.8 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/WeakMap.h>
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#include <LibJS/Runtime/WeakMapConstructor.h>
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namespace JS {
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WeakMapConstructor::WeakMapConstructor(Realm& realm)
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: NativeFunction(realm.vm().names.WeakMap.as_string(), realm.intrinsics().function_prototype())
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{
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}
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ThrowCompletionOr<void> WeakMapConstructor::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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// 24.3.2.1 WeakMap.prototype, https://tc39.es/ecma262/#sec-weakmap.prototype
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define_direct_property(vm.names.prototype, realm.intrinsics().weak_map_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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// 24.3.1.1 WeakMap ( [ iterable ] ), https://tc39.es/ecma262/#sec-weakmap-iterable
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ThrowCompletionOr<Value> WeakMapConstructor::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.WeakMap);
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}
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// 24.3.1.1 WeakMap ( [ iterable ] ), https://tc39.es/ecma262/#sec-weakmap-iterable
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ThrowCompletionOr<NonnullGCPtr<Object>> WeakMapConstructor::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 map be ? OrdinaryCreateFromConstructor(NewTarget, "%WeakMap.prototype%", « [[WeakMapData]] »).
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// 3. Set map.[[WeakMapData]] to a new empty List.
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auto map = TRY(ordinary_create_from_constructor<WeakMap>(vm, new_target, &Intrinsics::weak_map_prototype));
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// 4. If iterable is either undefined or null, return map.
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if (iterable.is_nullish())
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return map;
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// 5. Let adder be ? Get(map, "set").
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auto adder = TRY(map->get(vm.names.set));
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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, "'set' property of WeakMap");
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// 7. Return ? AddEntriesFromIterable(map, iterable, adder).
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(void)TRY(get_iterator_values(vm, iterable, [&](Value iterator_value) -> Optional<Completion> {
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if (!iterator_value.is_object())
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return vm.throw_completion<TypeError>(ErrorType::NotAnObject, DeprecatedString::formatted("Iterator value {}", TRY_OR_THROW_OOM(vm, iterator_value.to_string_without_side_effects())));
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auto key = TRY(iterator_value.as_object().get(0));
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auto value = TRY(iterator_value.as_object().get(1));
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TRY(JS::call(vm, adder.as_function(), map, key, value));
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return {};
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}));
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return map;
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}
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}
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