LibWeb: Add PlatformObject class

This represents the "platform object" concept from the IDL spec, which
refers to an object that implements an IDL interface.

Meta/Lagom/Tools/CodeGenerators/LibWeb/WrapperGenerator/IDLGenerators.cpp

@@ -972,7 +972,7 @@ static void generate_to_cpp(SourceGenerator& generator, ParameterType& parameter
         if (includes_wrappable_type) {
             // 5. If V is a platform object, then:
             union_generator.append(R"~~~(
-            if (is<Wrapper>(@js_name@@js_suffix@_object)) {
+            if (is<PlatformObject>(@js_name@@js_suffix@_object)) {
 )~~~");
 
             //    1. If types includes an interface type that V implements, then return the IDL value that is a reference to the object V.

Userland/Libraries/LibWeb/Bindings/PlatformObject.cpp

@@ -0,0 +1,18 @@
+/*
+ * Copyright (c) 2022, Andreas Kling <kling@serenityos.org>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include <LibWeb/Bindings/PlatformObject.h>
+
+namespace Web::Bindings {
+
+PlatformObject::PlatformObject(JS::Object& prototype)
+    : JS::Object(prototype)
+{
+}
+
+PlatformObject::~PlatformObject() = default;
+
+}

Userland/Libraries/LibWeb/Bindings/PlatformObject.h

@@ -0,0 +1,24 @@
+/*
+ * Copyright (c) 2022, Andreas Kling <kling@serenityos.org>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#pragma once
+
+#include <LibJS/Runtime/Object.h>
+
+namespace Web::Bindings {
+
+// https://webidl.spec.whatwg.org/#dfn-platform-object
+class PlatformObject : public JS::Object {
+    JS_OBJECT(PlatformObject, JS::Object);
+
+public:
+    virtual ~PlatformObject() override;
+
+protected:
+    explicit PlatformObject(JS::Object& prototype);
+};
+
+}

Userland/Libraries/LibWeb/Bindings/Wrapper.cpp

@@ -0,0 +1,18 @@
+/*
+ * Copyright (c) 2020-2022, Andreas Kling <kling@serenityos.org>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include <LibWeb/Bindings/Wrapper.h>
+
+namespace Web::Bindings {
+
+Wrapper::Wrapper(Object& prototype)
+    : PlatformObject(prototype)
+{
+}
+
+Wrapper::~Wrapper() = default;
+
+}

Userland/Libraries/LibWeb/Bindings/Wrapper.h

@@ -1,29 +1,27 @@
 /*
- * Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
+ * Copyright (c) 2020-2022, Andreas Kling <kling@serenityos.org>
  *
  * SPDX-License-Identifier: BSD-2-Clause
  */
 
 #pragma once
 
-#include <AK/NonnullRefPtr.h>
 #include <AK/Weakable.h>
-#include <LibJS/Runtime/Object.h>
+#include <LibWeb/Bindings/PlatformObject.h>
 #include <LibWeb/Forward.h>
 
 namespace Web::Bindings {
 
 class Wrapper
-    : public JS::Object
+    : public PlatformObject
     , public Weakable<Wrapper> {
-    JS_OBJECT(Wrapper, JS::Object);
+    JS_OBJECT(Wrapper, PlatformObject);
 
 public:
+    virtual ~Wrapper() override;
+
 protected:
-    explicit Wrapper(Object& prototype)
-        : Object(prototype)
-    {
-    }
+    explicit Wrapper(Object& prototype);
 };
 
 }

Userland/Libraries/LibWeb/CMakeLists.txt

@@ -18,10 +18,12 @@ set(SOURCES
     Bindings/NavigatorObject.cpp
     Bindings/NodeWrapperFactory.cpp
     Bindings/OptionConstructor.cpp
+    Bindings/PlatformObject.cpp
     Bindings/WindowConstructor.cpp
     Bindings/WindowObject.cpp
     Bindings/WindowProxy.cpp
     Bindings/Wrappable.cpp
+    Bindings/Wrapper.cpp
     Crypto/Crypto.cpp
     Crypto/SubtleCrypto.cpp
     CSS/Angle.cpp