Don't allow class_name in built-in scripts

core/script_language.h

@@ -264,7 +264,7 @@ public:
 		int location;
 	};
 
-	virtual Error lookup_code(const String &p_code, const String &p_symbol, const String &p_base_path, Object *p_owner, LookupResult &r_result) { return ERR_UNAVAILABLE; }
+	virtual Error lookup_code(const String &p_code, const String &p_symbol, const String &p_path, Object *p_owner, LookupResult &r_result) { return ERR_UNAVAILABLE; }
 
 	virtual void auto_indent_code(String &p_code, int p_from_line, int p_to_line) const = 0;
 	virtual void add_global_constant(const StringName &p_variable, const Variant &p_value) = 0;

editor/plugins/script_text_editor.cpp

@@ -634,7 +634,7 @@ void ScriptTextEditor::_lookup_symbol(const String &p_symbol, int p_row, int p_c
 			EditorNode::get_singleton()->load_resource(p_symbol);
 		}
 
-	} else if (script->get_language()->lookup_code(code_editor->get_text_edit()->get_text_for_lookup_completion(), p_symbol, script->get_path().get_base_dir(), base, result) == OK) {
+	} else if (script->get_language()->lookup_code(code_editor->get_text_edit()->get_text_for_lookup_completion(), p_symbol, script->get_path(), base, result) == OK) {
 
 		_goto_line(p_row);
 
@@ -1256,7 +1256,7 @@ void ScriptTextEditor::_text_edit_gui_input(const Ref<InputEvent> &ev) {
 					base = _find_node_for_script(base, base, script);
 				}
 				ScriptLanguage::LookupResult result;
-				if (script->get_language()->lookup_code(code_editor->get_text_edit()->get_text_for_lookup_completion(), word_at_mouse, script->get_path().get_base_dir(), base, result) == OK) {
+				if (script->get_language()->lookup_code(code_editor->get_text_edit()->get_text_for_lookup_completion(), word_at_mouse, script->get_path(), base, result) == OK) {
 					open_docs = true;
 				}
 			}

modules/gdscript/gdscript.h

@@ -458,7 +458,7 @@ public:
 	virtual String make_function(const String &p_class, const String &p_name, const PoolStringArray &p_args) const;
 	virtual Error complete_code(const String &p_code, const String &p_path, Object *p_owner, List<String> *r_options, bool &r_forced, String &r_call_hint);
 #ifdef TOOLS_ENABLED
-	virtual Error lookup_code(const String &p_code, const String &p_symbol, const String &p_base_path, Object *p_owner, LookupResult &r_result);
+	virtual Error lookup_code(const String &p_code, const String &p_symbol, const String &p_path, Object *p_owner, LookupResult &r_result);
 #endif
 	virtual String _get_indentation() const;
 	virtual void auto_indent_code(String &p_code, int p_from_line, int p_to_line) const;

modules/gdscript/gdscript_editor.cpp

@@ -3150,7 +3150,7 @@ static Error _lookup_symbol_from_base(const GDScriptParser::DataType &p_base, co
 	return ERR_CANT_RESOLVE;
 }
 
-Error GDScriptLanguage::lookup_code(const String &p_code, const String &p_symbol, const String &p_base_path, Object *p_owner, LookupResult &r_result) {
+Error GDScriptLanguage::lookup_code(const String &p_code, const String &p_symbol, const String &p_path, Object *p_owner, LookupResult &r_result) {
 
 	//before parsing, try the usual stuff
 	if (ClassDB::class_exists(p_symbol)) {
@@ -3192,7 +3192,7 @@ Error GDScriptLanguage::lookup_code(const String &p_code, const String &p_symbol
 	}
 
 	GDScriptParser parser;
-	parser.parse(p_code, p_base_path, false, "", true);
+	parser.parse(p_code, p_path.get_base_dir(), false, p_path, true);
 
 	if (parser.get_completion_type() == GDScriptParser::COMPLETION_NONE) {
 		return ERR_CANT_RESOLVE;
@@ -3204,7 +3204,7 @@ Error GDScriptLanguage::lookup_code(const String &p_code, const String &p_symbol
 	context.block = parser.get_completion_block();
 	context.line = parser.get_completion_line();
 	context.base = p_owner;
-	context.base_path = p_base_path;
+	context.base_path = p_path.get_base_dir();
 
 	if (context._class && context._class->extends_class.size() > 0) {
 		bool success = false;

modules/gdscript/gdscript_parser.cpp

@@ -3500,7 +3500,7 @@ void GDScriptParser::_parse_class(ClassNode *p_class) {
 					_set_error("'class_name' is only valid for the main class namespace.");
 					return;
 				}
-				if (self_path.empty()) {
+				if (self_path.begins_with("res://") && self_path.find("::") != -1) {
 					_set_error("'class_name' not allowed in built-in scripts.");
 					return;
 				}