Replace String comparisons with "", String() to is_empty()

Also:
- Adds two stress tests to test_string.h
- Changes to .empty() on std::strings

editor/visual_script_editor.cpp

@@ -1328,7 +1328,7 @@ void VisualScriptEditor::_create_function_dialog() {
 }
 
 void VisualScriptEditor::_create_function() {
-	String name = _validate_name((func_name_box->get_text() == "") ? "new_func" : func_name_box->get_text());
+	String name = _validate_name((func_name_box->get_text().is_empty()) ? "new_func" : func_name_box->get_text());
 	selected = name;
 	Vector2 pos = _get_available_pos();
 
@@ -2094,7 +2094,7 @@ Variant VisualScriptEditor::get_drag_data_fw(const Point2 &p_point, Control *p_f
 
 		String type = it->get_metadata(0);
 
-		if (type == String()) {
+		if (type.is_empty()) {
 			return Variant();
 		}
 
@@ -2622,7 +2622,7 @@ String VisualScriptEditor::get_name() {
 		name = TTR("[unsaved]");
 	} else if (script->is_built_in()) {
 		const String &script_name = script->get_name();
-		if (script_name != "") {
+		if (!script_name.is_empty()) {
 			// If the built-in script has a custom resource name defined,
 			// display the built-in script name as follows: `ResourceName (scene_file.tscn)`
 			name = vformat("%s (%s)", script_name, name.get_slice("::", 0));
@@ -2842,7 +2842,7 @@ void VisualScriptEditor::clear_edit_menu() {
 void VisualScriptEditor::_change_base_type_callback() {
 	String bt = select_base_type->get_selected_type();
 
-	ERR_FAIL_COND(bt == String());
+	ERR_FAIL_COND(bt.is_empty());
 	undo_redo->create_action(TTR("Change Base Type"));
 	undo_redo->add_do_method(script.ptr(), "set_instance_base_type", bt);
 	undo_redo->add_undo_method(script.ptr(), "set_instance_base_type", script->get_instance_base_type());
@@ -3213,7 +3213,7 @@ void VisualScriptEditor::_port_action_menu(int p_option) {
 			if (tg.type == Variant::OBJECT) {
 				if (tg.script.is_valid()) {
 					new_connect_node_select->select_from_script(tg.script, "");
-				} else if (type_string != String()) {
+				} else if (!type_string.is_empty()) {
 					new_connect_node_select->select_from_base_type(type_string);
 				} else {
 					new_connect_node_select->select_from_base_type(n->get_base_type());
@@ -3237,7 +3237,7 @@ void VisualScriptEditor::_port_action_menu(int p_option) {
 				property_info = script->get_node(port_action_node)->get_output_value_port_info(port_action_output);
 			}
 			if (tg.type == Variant::OBJECT) {
-				if (property_info.type == Variant::OBJECT && property_info.hint_string != String()) {
+				if (property_info.type == Variant::OBJECT && !property_info.hint_string.is_empty()) {
 					new_connect_node_select->select_from_action(property_info.hint_string);
 				} else {
 					new_connect_node_select->select_from_action("");
@@ -3462,7 +3462,7 @@ void VisualScriptEditor::_selected_connect_node(const String &p_text, const Stri
 					PropertyHint hint = script->get_node(port_action_node)->get_output_value_port_info(port_action_output).hint;
 					String base_type = script->get_node(port_action_node)->get_output_value_port_info(port_action_output).hint_string;
 
-					if (base_type != String() && hint == PROPERTY_HINT_TYPE_STRING) {
+					if (!base_type.is_empty() && hint == PROPERTY_HINT_TYPE_STRING) {
 						vsfc->set_base_type(base_type);
 					}
 					if (p_text == "call" || p_text == "call_deferred") {
@@ -3497,7 +3497,7 @@ void VisualScriptEditor::_selected_connect_node(const String &p_text, const Stri
 					PropertyHint hint = script->get_node(port_action_node)->get_output_value_port_info(port_action_output).hint;
 					String base_type = script->get_node(port_action_node)->get_output_value_port_info(port_action_output).hint_string;
 
-					if (base_type != String() && hint == PROPERTY_HINT_TYPE_STRING) {
+					if (!base_type.is_empty() && hint == PROPERTY_HINT_TYPE_STRING) {
 						vsp->set_base_type(base_type);
 					}
 				}
@@ -3526,7 +3526,7 @@ void VisualScriptEditor::_selected_connect_node(const String &p_text, const Stri
 				} else if (script->get_node(port_action_node).is_valid()) {
 					PropertyHint hint = script->get_node(port_action_node)->get_output_value_port_info(port_action_output).hint;
 					String base_type = script->get_node(port_action_node)->get_output_value_port_info(port_action_output).hint_string;
-					if (base_type != String() && hint == PROPERTY_HINT_TYPE_STRING) {
+					if (!base_type.is_empty() && hint == PROPERTY_HINT_TYPE_STRING) {
 						vsp->set_base_type(base_type);
 					}
 				}

editor/visual_script_property_selector.cpp

@@ -175,7 +175,7 @@ void VisualScriptPropertySelector::_update_search() {
 				String set_text = set_text_raw.capitalize();
 				String input = search_box->get_text().capitalize();
 
-				if (input == String() || get_text_raw.findn(input) != -1 || get_text.findn(input) != -1) {
+				if (input.is_empty() || get_text_raw.findn(input) != -1 || get_text.findn(input) != -1) {
 					TreeItem *item = search_options->create_item(category ? category : root);
 					item->set_text(0, get_text);
 					item->set_metadata(0, F.name);
@@ -188,7 +188,7 @@ void VisualScriptPropertySelector::_update_search() {
 					item->set_metadata(2, connecting);
 				}
 
-				if (input == String() || set_text_raw.findn(input) != -1 || set_text.findn(input) != -1) {
+				if (input.is_empty() || set_text_raw.findn(input) != -1 || set_text.findn(input) != -1) {
 					TreeItem *item = search_options->create_item(category ? category : root);
 					item->set_text(0, set_text);
 					item->set_metadata(0, F.name);
@@ -252,7 +252,7 @@ void VisualScriptPropertySelector::_update_search() {
 			String desc_raw = mi.name + desc_arguments;
 			String desc = desc_raw.capitalize().replace("( ", "(");
 
-			if (search_box->get_text() != String() &&
+			if (!search_box->get_text().is_empty() &&
 					name.findn(search_box->get_text()) == -1 &&
 					desc.findn(search_box->get_text()) == -1 &&
 					desc_raw.findn(search_box->get_text()) == -1) {
@@ -322,7 +322,7 @@ void VisualScriptPropertySelector::_update_search() {
 }
 
 void VisualScriptPropertySelector::create_visualscript_item(const String &name, TreeItem *const root, const String &search_input, const String &text) {
-	if (search_input == String() || text.findn(search_input) != -1) {
+	if (search_input.is_empty() || text.findn(search_input) != -1) {
 		TreeItem *item = search_options->create_item(root);
 		item->set_text(0, text);
 		item->set_icon(0, vbc->get_theme_icon(SNAME("VisualScript"), SNAME("EditorIcons")));
@@ -352,7 +352,7 @@ void VisualScriptPropertySelector::get_visual_node_names(const String &root_filt
 		bool in_filter = false;
 		Vector<String> tx_filters = search_box->get_text().split(" ");
 		for (int i = 0; i < tx_filters.size(); i++) {
-			if (tx_filters[i] == "") {
+			if (tx_filters[i].is_empty()) {
 				in_filter = true;
 			} else {
 				in_filter = false;
@@ -451,7 +451,7 @@ void VisualScriptPropertySelector::_item_selected() {
 
 	String at_class = class_type;
 
-	while (at_class != String()) {
+	while (!at_class.is_empty()) {
 		Map<String, DocData::ClassDoc>::Element *E = dd->class_list.find(at_class);
 		if (E) {
 			for (int i = 0; i < E->get().properties.size(); i++) {
@@ -465,7 +465,7 @@ void VisualScriptPropertySelector::_item_selected() {
 	}
 	at_class = class_type;
 
-	while (at_class != String()) {
+	while (!at_class.is_empty()) {
 		Map<String, DocData::ClassDoc>::Element *C = dd->class_list.find(at_class);
 		if (C) {
 			for (int i = 0; i < C->get().methods.size(); i++) {
@@ -521,7 +521,7 @@ void VisualScriptPropertySelector::_item_selected() {
 
 	memdelete(names);
 
-	if (text == String()) {
+	if (text.is_empty()) {
 		return;
 	}
 

visual_script.cpp

@@ -1665,8 +1665,8 @@ Variant VisualScriptInstance::_call_internal(const StringName &p_method, void *p
 		String err_func = p_method;
 		int err_line = current_node_id; // Not a line but it works as one.
 
-		if (node && (r_error.error != Callable::CallError::CALL_ERROR_INVALID_METHOD || error_str == String())) {
+		if (node && (r_error.error != Callable::CallError::CALL_ERROR_INVALID_METHOD || error_str.is_empty())) {
-			if (error_str != String()) {
+			if (!error_str.is_empty()) {
 				error_str += " ";
 			}
 
@@ -2379,7 +2379,7 @@ void VisualScriptLanguage::debug_get_stack_level_locals(int p_level, List<String
 
 	for (int i = 0; i < node->input_port_count; i++) {
 		String name = node->get_base_node()->get_input_value_port_info(i).name;
-		if (name == String()) {
+		if (name.is_empty()) {
 			name = "in_" + itos(i);
 		}
 
@@ -2399,7 +2399,7 @@ void VisualScriptLanguage::debug_get_stack_level_locals(int p_level, List<String
 
 	for (int i = 0; i < node->output_port_count; i++) {
 		String name = node->get_base_node()->get_output_value_port_info(i).name;
-		if (name == String()) {
+		if (name.is_empty()) {
 			name = "out_" + itos(i);
 		}
 

visual_script_flow_control.cpp

@@ -724,7 +724,7 @@ String VisualScriptTypeCast::get_caption() const {
 }
 
 String VisualScriptTypeCast::get_text() const {
-	if (script != String()) {
+	if (!script.is_empty()) {
 		return "Is " + script.get_file() + "?";
 	} else {
 		return "Is " + base_type + "?";
@@ -762,7 +762,7 @@ String VisualScriptTypeCast::get_base_script() const {
 VisualScriptTypeCast::TypeGuess VisualScriptTypeCast::guess_output_type(TypeGuess *p_inputs, int p_output) const {
 	TypeGuess tg;
 	tg.type = Variant::OBJECT;
-	if (script != String()) {
+	if (!script.is_empty()) {
 		tg.script = ResourceLoader::load(script);
 	}
 	//if (!tg.script.is_valid()) {
@@ -793,7 +793,7 @@ public:
 			return 0;
 		}
 
-		if (script != String()) {
+		if (!script.is_empty()) {
 			Ref<Script> obj_script = obj->get_script();
 			if (!obj_script.is_valid()) {
 				return 1; //well, definitely not the script because object we got has no script.
@@ -853,7 +853,7 @@ void VisualScriptTypeCast::_bind_methods() {
 
 	String script_ext_hint;
 	for (const String &E : script_extensions) {
-		if (script_ext_hint != String()) {
+		if (!script_ext_hint.is_empty()) {
 			script_ext_hint += ",";
 		}
 		script_ext_hint += "*." + E;

visual_script_func_nodes.cpp

@@ -370,7 +370,7 @@ void VisualScriptFunctionCall::_update_method_cache() {
 
 	} else if (call_mode == CALL_MODE_INSTANCE) {
 		type = base_type;
-		if (base_script != String()) {
+		if (!base_script.is_empty()) {
 			if (!ResourceCache::has(base_script) && ScriptServer::edit_request_func) {
 				ScriptServer::edit_request_func(base_script); //make sure it's loaded
 			}
@@ -539,7 +539,7 @@ void VisualScriptFunctionCall::_validate_property(PropertyInfo &property) const
 			property.hint = PROPERTY_HINT_ENUM;
 			String sl;
 			for (const Engine::Singleton &E : names) {
-				if (sl != String()) {
+				if (!sl.is_empty()) {
 					sl += ",";
 				}
 				sl += E.name;
@@ -580,7 +580,7 @@ void VisualScriptFunctionCall::_validate_property(PropertyInfo &property) const
 			property.hint = PROPERTY_HINT_METHOD_OF_BASE_TYPE;
 			property.hint_string = base_type;
 
-			if (base_script != String()) {
+			if (!base_script.is_empty()) {
 				if (!ResourceCache::has(base_script) && ScriptServer::edit_request_func) {
 					ScriptServer::edit_request_func(base_script); //make sure it's loaded
 				}
@@ -684,7 +684,7 @@ void VisualScriptFunctionCall::_bind_methods() {
 
 	String script_ext_hint;
 	for (const String &E : script_extensions) {
-		if (script_ext_hint != String()) {
+		if (!script_ext_hint.is_empty()) {
 			script_ext_hint += ",";
 		}
 		script_ext_hint += "*." + E;
@@ -1161,7 +1161,7 @@ void VisualScriptPropertySet::_update_cache() {
 			}
 		} else if (call_mode == CALL_MODE_INSTANCE) {
 			type = base_type;
-			if (base_script != String()) {
+			if (!base_script.is_empty()) {
 				if (!ResourceCache::has(base_script) && ScriptServer::edit_request_func) {
 					ScriptServer::edit_request_func(base_script); //make sure it's loaded
 				}
@@ -1321,7 +1321,7 @@ void VisualScriptPropertySet::_validate_property(PropertyInfo &property) const {
 			property.hint = PROPERTY_HINT_PROPERTY_OF_BASE_TYPE;
 			property.hint_string = base_type;
 
-			if (base_script != String()) {
+			if (!base_script.is_empty()) {
 				if (!ResourceCache::has(base_script) && ScriptServer::edit_request_func) {
 					ScriptServer::edit_request_func(base_script); //make sure it's loaded
 				}
@@ -1361,7 +1361,7 @@ void VisualScriptPropertySet::_validate_property(PropertyInfo &property) const {
 		property.hint = PROPERTY_HINT_ENUM;
 		property.hint_string = options;
 		property.type = Variant::STRING;
-		if (options == "") {
+		if (options.is_empty()) {
 			property.usage = PROPERTY_USAGE_NONE; //hide if type has no usable index
 		}
 	}
@@ -1411,7 +1411,7 @@ void VisualScriptPropertySet::_bind_methods() {
 
 	String script_ext_hint;
 	for (const String &E : script_extensions) {
-		if (script_ext_hint != String()) {
+		if (!script_ext_hint.is_empty()) {
 			script_ext_hint += ",";
 		}
 		script_ext_hint += "*." + E;
@@ -1847,7 +1847,7 @@ void VisualScriptPropertyGet::_update_cache() {
 			}
 		} else if (call_mode == CALL_MODE_INSTANCE) {
 			type = base_type;
-			if (base_script != String()) {
+			if (!base_script.is_empty()) {
 				if (!ResourceCache::has(base_script) && ScriptServer::edit_request_func) {
 					ScriptServer::edit_request_func(base_script); //make sure it's loaded
 				}
@@ -2027,7 +2027,7 @@ void VisualScriptPropertyGet::_validate_property(PropertyInfo &property) const {
 			property.hint = PROPERTY_HINT_PROPERTY_OF_BASE_TYPE;
 			property.hint_string = base_type;
 
-			if (base_script != String()) {
+			if (!base_script.is_empty()) {
 				if (!ResourceCache::has(base_script) && ScriptServer::edit_request_func) {
 					ScriptServer::edit_request_func(base_script); //make sure it's loaded
 				}
@@ -2066,7 +2066,7 @@ void VisualScriptPropertyGet::_validate_property(PropertyInfo &property) const {
 		property.hint = PROPERTY_HINT_ENUM;
 		property.hint_string = options;
 		property.type = Variant::STRING;
-		if (options == "") {
+		if (options.is_empty()) {
 			property.usage = PROPERTY_USAGE_NONE; //hide if type has no usable index
 		}
 	}
@@ -2113,7 +2113,7 @@ void VisualScriptPropertyGet::_bind_methods() {
 
 	String script_ext_hint;
 	for (const String &E : script_extensions) {
-		if (script_ext_hint != String()) {
+		if (!script_ext_hint.is_empty()) {
 			script_ext_hint += ",";
 		}
 		script_ext_hint += "." + E;
@@ -2324,7 +2324,7 @@ void VisualScriptEmitSignal::_validate_property(PropertyInfo &property) const {
 
 		String ml;
 		for (const StringName &E : sigs) {
-			if (ml != String()) {
+			if (!ml.is_empty()) {
 				ml += ",";
 			}
 			ml += E;

visual_script_nodes.cpp

@@ -1307,7 +1307,7 @@ void VisualScriptVariableGet::_validate_property(PropertyInfo &property) const {
 
 		String vhint;
 		for (const StringName &E : vars) {
-			if (vhint != String()) {
+			if (!vhint.is_empty()) {
 				vhint += ",";
 			}
 
@@ -1417,7 +1417,7 @@ void VisualScriptVariableSet::_validate_property(PropertyInfo &property) const {
 
 		String vhint;
 		for (const StringName &E : vars) {
-			if (vhint != String()) {
+			if (!vhint.is_empty()) {
 				vhint += ",";
 			}
 
@@ -1615,7 +1615,7 @@ PropertyInfo VisualScriptPreload::get_output_value_port_info(int p_idx) const {
 		pinfo.hint_string = preload->get_class();
 		if (preload->get_path().is_resource_file()) {
 			pinfo.name = preload->get_path();
-		} else if (preload->get_name() != String()) {
+		} else if (!preload->get_name().is_empty()) {
 			pinfo.name = preload->get_name();
 		} else {
 			pinfo.name = preload->get_class();
@@ -1994,7 +1994,7 @@ void VisualScriptClassConstant::_validate_property(PropertyInfo &property) const
 
 		property.hint_string = "";
 		for (const String &E : constants) {
-			if (property.hint_string != String()) {
+			if (!property.hint_string.is_empty()) {
 				property.hint_string += ",";
 			}
 			property.hint_string += E;
@@ -2132,7 +2132,7 @@ void VisualScriptBasicTypeConstant::_validate_property(PropertyInfo &property) c
 		}
 		property.hint_string = "";
 		for (const StringName &E : constants) {
-			if (property.hint_string != String()) {
+			if (!property.hint_string.is_empty()) {
 				property.hint_string += ",";
 			}
 			property.hint_string += String(E);
@@ -2363,7 +2363,7 @@ void VisualScriptEngineSingleton::_validate_property(PropertyInfo &property) con
 			continue; //skip these, too simple named
 		}
 
-		if (cc != String()) {
+		if (!cc.is_empty()) {
 			cc += ",";
 		}
 		cc += E.name;
@@ -3147,7 +3147,7 @@ String VisualScriptSubCall::get_caption() const {
 String VisualScriptSubCall::get_text() const {
 	Ref<Script> script = get_script();
 	if (script.is_valid()) {
-		if (script->get_name() != String()) {
+		if (!script->get_name().is_empty()) {
 			return script->get_name();
 		}
 		if (script->get_path().is_resource_file()) {
@@ -3786,7 +3786,7 @@ void VisualScriptInputAction::_validate_property(PropertyInfo &property) const {
 		al.sort();
 
 		for (int i = 0; i < al.size(); i++) {
-			if (actions != String()) {
+			if (!actions.is_empty()) {
 				actions += ",";
 			}
 			actions += al[i];

visual_script_yield_nodes.cpp

@@ -449,7 +449,7 @@ void VisualScriptYieldSignal::_validate_property(PropertyInfo &property) const {
 
 		String ml;
 		for (const String &E : mstring) {
-			if (ml != String()) {
+			if (!ml.is_empty()) {
 				ml += ",";
 			}
 			ml += E;