LibJS: Add the WeakRef built-in object

1 files changed, 52 insertions, 0 deletions

diff --git a/Userland/Libraries/LibJS/Runtime/WeakRefConstructor.cpp b/Userland/Libraries/LibJS/Runtime/WeakRefConstructor.cpp
new file mode 100644
index 0000000000..6940580ecc
--- /dev/null
+++ b/Userland/Libraries/LibJS/Runtime/WeakRefConstructor.cpp
@@ -0,0 +1,52 @@
+/*
+ * Copyright (c) 2021, Idan Horowitz <idan.horowitz@serenityos.org>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include <LibJS/Runtime/Error.h>
+#include <LibJS/Runtime/GlobalObject.h>
+#include <LibJS/Runtime/WeakRef.h>
+#include <LibJS/Runtime/WeakRefConstructor.h>
+
+namespace JS {
+
+WeakRefConstructor::WeakRefConstructor(GlobalObject& global_object)
+    : NativeFunction(vm().names.WeakRef, *global_object.function_prototype())
+{
+}
+
+void WeakRefConstructor::initialize(GlobalObject& global_object)
+{
+    auto& vm = this->vm();
+    NativeFunction::initialize(global_object);
+    define_property(vm.names.prototype, global_object.weak_ref_prototype(), 0);
+    define_property(vm.names.length, Value(1), Attribute::Configurable);
+}
+
+WeakRefConstructor::~WeakRefConstructor()
+{
+}
+
+Value WeakRefConstructor::call()
+{
+    auto& vm = this->vm();
+    vm.throw_exception<TypeError>(global_object(), ErrorType::ConstructorWithoutNew, vm.names.WeakRef);
+    return {};
+}
+
+// 26.1.1.1 WeakRef ( target ), https://tc39.es/ecma262/#sec-weak-ref-target
+Value WeakRefConstructor::construct(Function&)
+{
+    auto& vm = this->vm();
+    auto target = vm.argument(0);
+    if (!target.is_object()) {
+        vm.throw_exception<TypeError>(global_object(), ErrorType::NotAnObject, target.to_string_without_side_effects());
+        return {};
+    }
+
+    // FIXME: Use OrdinaryCreateFromConstructor(newTarget, "%WeakRef.prototype%")
+    return WeakRef::create(global_object(), &target.as_object());
+}
+
+}