Trait System

core/object/object.cpp

@@ -932,6 +932,7 @@ void Object::set_script(const Variant &p_script) {
 		ERR_FAIL_COND_MSG(s.is_null(), "Cannot set object script. Parameter should be null or a reference to a valid script.");
 		ERR_FAIL_COND_MSG(s->is_abstract(), vformat("Cannot set object script. Script '%s' should not be abstract.", s->get_path()));
 	}
+	ERR_FAIL_COND_MSG(!s->is_attachable(), vformat("Cannot set object script. Script '%s' is not attachable.", s->get_path()));
 
 	script = p_script;
 

core/object/script_language.cpp

@@ -173,6 +173,7 @@ void Script::_bind_methods() {
 
 	ClassDB::bind_method(D_METHOD("is_tool"), &Script::is_tool);
 	ClassDB::bind_method(D_METHOD("is_abstract"), &Script::is_abstract);
+	ClassDB::bind_method(D_METHOD("is_attachable"), &Script::is_attachable);
 
 	ClassDB::bind_method(D_METHOD("get_rpc_config"), &Script::get_rpc_config);
 

core/object/script_language.h

@@ -166,6 +166,7 @@ class Script : public Resource {
 	virtual bool is_tool() const = 0;
 	virtual bool is_valid() const = 0;
 	virtual bool is_abstract() const = 0;
+	virtual bool is_attachable() const { return true; }
 
 	virtual ScriptLanguage *get_language() const = 0;
 
@@ -214,6 +215,7 @@ class ScriptLanguage : public Object {
 	virtual void init() = 0;
 	virtual String get_type() const = 0;
 	virtual String get_extension() const = 0;
+	virtual bool is_language_script_attachable() const { return true; }
 	virtual void finish() = 0;
 
 	/* EDITOR FUNCTIONS */

doc/classes/Script.xml

@@ -6,7 +6,7 @@
 	<description>
 		A class stored as a resource. A script extends the functionality of all objects that instantiate it.
 		This is the base class for all scripts and should not be used directly. Trying to create a new script with this class will result in an error.
-		The [code]new[/code] method of a script subclass creates a new instance. [method Object.set_script] extends an existing object, if that object's class matches one of the script's base classes.
+		The [code]new[/code] method of a script subclass creates a new instance. [method Object.set_script] extends an existing object, if that object's class matches one of the script's base classes and if script is attachable check by [method is_attachable].
 	</description>
 	<tutorials>
 		<link title="Scripting documentation index">$DOCS_URL/tutorials/scripting/index.html</link>
@@ -115,6 +115,12 @@
 				Returns [code]true[/code] if the script is an abstract script. An abstract script does not have a constructor and cannot be instantiated.
 			</description>
 		</method>
+		<method name="is_attachable" qualifiers="const">
+			<return type="bool" />
+			<description>
+				Returns [code]true[/code] if the script is able to be attached to [Object].
+			</description>
+		</method>
 		<method name="is_tool" qualifiers="const">
 			<return type="bool" />
 			<description>

editor/debugger/script_editor_debugger.cpp

@@ -459,7 +459,10 @@ void ScriptEditorDebugger::_parse_message(const String &p_msg, uint64_t p_thread
 			stack_dump_info.push_back(d);
 			s->set_metadata(0, d);
 
-			String line = itos(i) + " - " + String(d["file"]) + ":" + itos(d["line"]) + " - at function: " + String(d["function"]);
+			String line = itos(i) + " - " + String(d["file"]) + ":" + itos(d["line"]);
+			if (!String(d["function"]).is_empty()) {
+				line += " - at function: " + String(d["function"]);
+			}
 			s->set_text(0, line);
 
 			if (i == 0) {

editor/filesystem_dock.cpp

@@ -4216,6 +4216,7 @@ FileSystemDock::FileSystemDock() {
 	make_scene_dialog->connect(SceneStringName(confirmed), callable_mp(this, &FileSystemDock::_make_scene_confirm));
 
 	make_script_dialog = memnew(ScriptCreateDialog);
+	make_script_dialog->set_languages_list(false);
 	make_script_dialog->set_title(TTR("Create Script"));
 	add_child(make_script_dialog);
 

editor/script_create_dialog.cpp

@@ -128,17 +128,16 @@ void ScriptCreateDialog::_notification(int p_what) {
 		} break;
 
 		case NOTIFICATION_THEME_CHANGED: {
-			for (int i = 0; i < ScriptServer::get_language_count(); i++) {
-				Ref<Texture2D> language_icon = get_editor_theme_icon(ScriptServer::get_language(i)->get_type());
-				if (language_icon.is_valid()) {
-					language_menu->set_item_icon(i, language_icon);
-				}
-			}
+			set_languages_list(is_languages_list_only_attachable);
 
 			path_button->set_button_icon(get_editor_theme_icon(SNAME("Folder")));
 			parent_browse_button->set_button_icon(get_editor_theme_icon(SNAME("Folder")));
 			parent_search_button->set_button_icon(get_editor_theme_icon(SNAME("ClassList")));
 		} break;
+
+		case NOTIFICATION_POSTINITIALIZE: {
+			set_languages_list(is_languages_list_only_attachable);
+		} break;
 	}
 }
 
@@ -194,6 +193,40 @@ void ScriptCreateDialog::set_inheritance_base_type(const String &p_base) {
 	base_type = p_base;
 }
 
+void ScriptCreateDialog::set_languages_list(const bool p_only_attachable) {
+	is_languages_list_only_attachable = p_only_attachable;
+	String previous_default;
+	if (language_menu->get_selected_id() > -1) {
+		previous_default = language_menu->get_item_text(language_menu->get_selected_id());
+	}
+	default_language = -1;
+	language_menu->clear();
+	language_list.clear();
+	int skipped_lang = 0;
+	for (int i = 0; i < ScriptServer::get_language_count(); i++) {
+		ScriptLanguage *lang = ScriptServer::get_language(i);
+		if (p_only_attachable && !lang->is_language_script_attachable()) {
+			skipped_lang++;
+			continue;
+		}
+		language_menu->add_item(lang->get_name());
+		Ref<Texture2D> language_icon = get_editor_theme_icon(lang->get_type());
+		if (language_icon.is_valid()) {
+			language_menu->set_item_icon(i - skipped_lang, language_icon);
+		}
+		if (lang->get_name() == previous_default) {
+			default_language = i - skipped_lang;
+		}
+		if (default_language == -1 && lang->get_name() == "GDScript") {
+			default_language = i - skipped_lang;
+		}
+		language_list.append(lang);
+	}
+	if (default_language >= 0) {
+		language_menu->select(default_language);
+	}
+}
+
 bool ScriptCreateDialog::_validate_parent(const String &p_string) {
 	if (p_string.length() == 0) {
 		return false;
@@ -262,7 +295,7 @@ String ScriptCreateDialog::_validate_path(const String &p_path, bool p_file_must
 	for (const String &E : extensions) {
 		if (E.nocasecmp_to(extension) == 0) {
 			found = true;
-			if (E == ScriptServer::get_language(language_menu->get_selected())->get_extension()) {
+			if (E == language->get_extension()) {
 				match = true;
 			}
 			break;
@@ -272,12 +305,26 @@ String ScriptCreateDialog::_validate_path(const String &p_path, bool p_file_must
 	if (!found) {
 		return TTR("Invalid extension.");
 	}
-	if (!match) {
+	if (!match && _extention_update_selected_language(p.get_extension()) != OK) {
 		return TTR("Extension doesn't match chosen language.");
 	}
 
 	// Let ScriptLanguage do custom validation.
-	return ScriptServer::get_language(language_menu->get_selected())->validate_path(p);
+	return language->validate_path(p);
+}
+
+Error ScriptCreateDialog::_extention_update_selected_language(const String &p_extention) {
+	int skipped_lang = 0;
+	for (int i = 0; i < language_list.size(); i++) {
+		ScriptLanguage *lang = language_list[i];
+		if (p_extention == lang->get_extension()) {
+			language_menu->select(i - skipped_lang);
+			_language_changed(i - skipped_lang);
+			file_path->set_caret_column(file_path->get_text().length());
+			return OK;
+		}
+	}
+	return FAILED;
 }
 
 void ScriptCreateDialog::_parent_name_changed(const String &p_parent) {
@@ -344,7 +391,7 @@ void ScriptCreateDialog::_create_new() {
 	}
 
 	String class_name = file_path->get_text().get_file().get_basename();
-	scr = ScriptServer::get_language(language_menu->get_selected())->make_template(sinfo.content, class_name, parent_class);
+	scr = language->make_template(sinfo.content, class_name, parent_class);
 
 	if (is_built_in) {
 		scr->set_name(built_in_name->get_text());
@@ -380,7 +427,7 @@ void ScriptCreateDialog::_load_exist() {
 }
 
 void ScriptCreateDialog::_language_changed(int l) {
-	language = ScriptServer::get_language(l);
+	language = language_list[l];
 
 	can_inherit_from_file = language->can_inherit_from_file();
 	supports_built_in = language->supports_builtin_mode();
@@ -855,18 +902,6 @@ ScriptCreateDialog::ScriptCreateDialog() {
 	gc->add_child(memnew(Label(TTR("Language:"))));
 	gc->add_child(language_menu);
 
-	default_language = -1;
-	for (int i = 0; i < ScriptServer::get_language_count(); i++) {
-		String lang = ScriptServer::get_language(i)->get_name();
-		language_menu->add_item(lang);
-		if (lang == "GDScript") {
-			default_language = i;
-		}
-	}
-	if (default_language >= 0) {
-		language_menu->select(default_language);
-	}
-
 	language_menu->connect(SceneStringName(item_selected), callable_mp(this, &ScriptCreateDialog::_language_changed));
 
 	/* Inherits */

editor/script_create_dialog.h

@@ -68,6 +68,7 @@ class ScriptCreateDialog : public ConfirmationDialog {
 	AcceptDialog *alert = nullptr;
 	CreateDialog *select_class = nullptr;
 
+	bool is_languages_list_only_attachable = true;
 	bool is_browsing_parent = false;
 	String path_error;
 	String template_inactive_message;
@@ -89,6 +90,7 @@ class ScriptCreateDialog : public ConfirmationDialog {
 
 	Vector<ScriptLanguage::ScriptTemplate> template_list;
 	ScriptLanguage *language = nullptr;
+	Vector<ScriptLanguage *> language_list;
 
 	String base_type;
 
@@ -100,6 +102,7 @@ class ScriptCreateDialog : public ConfirmationDialog {
 	void _use_template_pressed();
 	bool _validate_parent(const String &p_string);
 	String _validate_path(const String &p_path, bool p_file_must_exist);
+	Error _extention_update_selected_language(const String &p_extention);
 	void _parent_name_changed(const String &p_parent);
 	void _template_changed(int p_template = 0);
 	void _browse_path(bool browse_parent, bool p_save);
@@ -124,6 +127,7 @@ class ScriptCreateDialog : public ConfirmationDialog {
 public:
 	void config(const String &p_base_name, const String &p_base_path, bool p_built_in_enabled = true, bool p_load_enabled = true);
 	void set_inheritance_base_type(const String &p_base);
+	void set_languages_list(const bool p_only_attachable);
 	ScriptCreateDialog();
 };
 

modules/gdscript/.editorconfig

@@ -1,3 +1,7 @@
 [*.gd]
 indent_size = 4
 trim_trailing_whitespace = true
+
+[*.gdt]
+indent_size = 4
+trim_trailing_whitespace = true

modules/gdscript/config.py

@@ -10,7 +10,9 @@ def configure(env):
 def get_doc_classes():
     return [
         "@GDScript",
+        "@GDTrait",
         "GDScript",
+        "GDTrait",
         "GDScriptSyntaxHighlighter",
     ]