LibWeb: Stop generating C++ includes for non-code-generating IDL files

Specifically, IDL files that do not include interface or enumeration
declarations do not generate any code, and as such should not be
included.

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

@@ -222,6 +222,9 @@ static void emit_includes_for_all_imports(auto& interface, auto& generator, bool
                 interfaces.enqueue(&imported_interface);
         }
 
+        if (!interface->will_generate_code())
+            continue;
+
         generate_include_for(generator, interface->module_own_path);
 
         if (is_iterator) {
@@ -1543,7 +1546,7 @@ void generate_header(IDL::Interface const& interface)
 #include <LibWeb/Bindings/Wrapper.h>
 )~~~");
 
-    for (auto& path : interface.imported_paths)
+    for (auto& path : interface.required_imported_paths)
         generate_include_for(generator, path);
 
     emit_includes_for_all_imports(interface, generator, true);
@@ -2886,7 +2889,7 @@ void generate_prototype_implementation(IDL::Interface const& interface)
 
 )~~~");
 
-    for (auto& path : interface.imported_paths)
+    for (auto& path : interface.required_imported_paths)
         generate_include_for(generator, path);
 
     emit_includes_for_all_imports(interface, generator, false, interface.pair_iterator_types.has_value());
@@ -3334,7 +3337,7 @@ void generate_iterator_implementation(IDL::Interface const& interface)
 
 )~~~");
 
-    for (auto& path : interface.imported_paths)
+    for (auto& path : interface.required_imported_paths)
         generate_include_for(generator, path);
 
     emit_includes_for_all_imports(interface, generator, false, true);

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

@@ -141,7 +141,10 @@ Optional<NonnullOwnPtr<Interface>> Parser::resolve_import(auto path)
         report_parsing_error(String::formatted("Failed to open {}: {}", real_path, file_or_error.error()), filename, input, lexer.tell());
 
     auto data = file_or_error.value()->read_all();
-    return Parser(real_path, data, import_base_path).parse();
+    auto result = Parser(real_path, data, import_base_path).parse();
+    if (result->will_generate_code())
+        required_imported_paths.set(real_path);
+    return result;
 }
 
 NonnullRefPtr<Type> Parser::parse_type()
@@ -745,13 +748,16 @@ NonnullOwnPtr<Interface> Parser::parse()
         lexer.ignore();
         auto maybe_interface = resolve_import(path);
         if (maybe_interface.has_value()) {
-            for (auto& entry : maybe_interface.value()->imported_paths)
+            for (auto& entry : maybe_interface.value()->all_imported_paths)
                 s_all_imported_paths.set(entry);
+            for (auto& entry : maybe_interface.value()->required_imported_paths)
+                required_imported_paths.set(entry);
             imports.append(maybe_interface.release_value());
         }
         consume_whitespace();
     }
-    interface->imported_paths = s_all_imported_paths;
+    interface->all_imported_paths = s_all_imported_paths;
+    interface->required_imported_paths = required_imported_paths;
 
     if (lexer.consume_specific('['))
         interface->extended_attributes = parse_extended_attributes();
@@ -828,6 +834,8 @@ NonnullOwnPtr<Interface> Parser::parse()
     }
     // FIXME: Add support for overloading constructors
 
+    if (interface->will_generate_code())
+        interface->required_imported_paths.set(this_module);
     interface->imported_modules = move(imports);
 
     return interface;

Meta/Lagom/Tools/CodeGenerators/LibWeb/WrapperGenerator/IDLParser.h

@@ -52,6 +52,7 @@ private:
     void parse_constant(Interface&);
 
     static HashTable<String> s_all_imported_paths;
+    HashTable<String> required_imported_paths;
     String import_base_path;
     String filename;
     StringView input;

Meta/Lagom/Tools/CodeGenerators/LibWeb/WrapperGenerator/IDLTypes.h

@@ -196,7 +196,8 @@ struct Interface {
     HashMap<String, HashTable<String>> included_mixins;
 
     String module_own_path;
-    HashTable<String> imported_paths;
+    HashTable<String> all_imported_paths;
+    HashTable<String> required_imported_paths;
     NonnullOwnPtrVector<Interface> imported_modules;
 
     HashMap<String, Vector<Function&>> overload_sets;
@@ -210,6 +211,11 @@ struct Interface {
 
     // https://webidl.spec.whatwg.org/#dfn-legacy-platform-object
     bool is_legacy_platform_object() const { return !extended_attributes.contains("Global") && (supports_indexed_properties() || supports_named_properties()); }
+
+    bool will_generate_code() const
+    {
+        return !name.is_empty() || any_of(enumerations, [](auto& entry) { return entry.value.is_original_definition; });
+    }
 };
 
 CppType idl_type_name_to_cpp_type(Type const& type, IDL::Interface const& interface);