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

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

8 files changed, 36 insertions, 36 deletions

diff --git a/modules/gdscript/editor/gdscript_highlighter.cpp b/modules/gdscript/editor/gdscript_highlighter.cpp
index 6529154e5c..4f711dfd1e 100644
--- a/modules/gdscript/editor/gdscript_highlighter.cpp
+++ b/modules/gdscript/editor/gdscript_highlighter.cpp
@@ -413,7 +413,7 @@ Dictionary GDScriptSyntaxHighlighter::_get_line_syntax_highlighting_impl(int p_l
 					previous_column = j;
 
 					// ignore if just whitespace
-					if (text != "") {
+					if (!text.is_empty()) {
 						previous_text = text;
 					}
 				}
@@ -509,7 +509,7 @@ void GDScriptSyntaxHighlighter::_update_cache() {
 	for (const String &comment : comments) {
 		String beg = comment.get_slice(" ", 0);
 		String end = comment.get_slice_count(" ") > 1 ? comment.get_slice(" ", 1) : String();
-		add_color_region(beg, end, comment_color, end == "");
+		add_color_region(beg, end, comment_color, end.is_empty());
 	}
 
 	/* Strings */
@@ -519,7 +519,7 @@ void GDScriptSyntaxHighlighter::_update_cache() {
 	for (const String &string : strings) {
 		String beg = string.get_slice(" ", 0);
 		String end = string.get_slice_count(" ") > 1 ? string.get_slice(" ", 1) : String();
-		add_color_region(beg, end, string_color, end == "");
+		add_color_region(beg, end, string_color, end.is_empty());
 	}
 
 	const Ref<Script> script = _get_edited_resource();
diff --git a/modules/gdscript/gdscript.cpp b/modules/gdscript/gdscript.cpp
index b76c2c0437..4822e411ce 100644
--- a/modules/gdscript/gdscript.cpp
+++ b/modules/gdscript/gdscript.cpp
@@ -389,7 +389,7 @@ bool GDScript::instance_has(const Object *p_this) const {
 }
 
 bool GDScript::has_source_code() const {
-	return source != "";
+	return !source.is_empty();
 }
 
 String GDScript::get_source_code() const {
@@ -458,7 +458,7 @@ void GDScript::_update_doc() {
 	doc.is_script_doc = true;
 
 	if (base.is_valid() && base->is_valid()) {
-		if (base->doc.name != String()) {
+		if (!base->doc.name.is_empty()) {
 			doc.inherits = base->doc.name;
 		} else {
 			doc.inherits = base->get_instance_base_type();
@@ -472,7 +472,7 @@ void GDScript::_update_doc() {
 	doc.tutorials = doc_tutorials;
 
 	for (const KeyValue<String, DocData::EnumDoc> &E : doc_enums) {
-		if (E.value.description != "") {
+		if (!E.value.description.is_empty()) {
 			doc.enums[E.key] = E.value.description;
 		}
 	}
@@ -616,11 +616,11 @@ bool GDScript::_update_exports(bool *r_err, bool p_recursive_call, PlaceHolderSc
 
 		String basedir = path;
 
-		if (basedir == "") {
+		if (basedir.is_empty()) {
 			basedir = get_path();
 		}
 
-		if (basedir != "") {
+		if (!basedir.is_empty()) {
 			basedir = basedir.get_base_dir();
 		}
 
@@ -642,7 +642,7 @@ bool GDScript::_update_exports(bool *r_err, bool p_recursive_call, PlaceHolderSc
 					path = c->extends_path;
 					if (path.is_relative_path()) {
 						String base = get_path();
-						if (base == "" || base.is_relative_path()) {
+						if (base.is_empty() || base.is_relative_path()) {
 							ERR_PRINT(("Could not resolve relative path for parent class: " + path).utf8().get_data());
 						} else {
 							path = base.get_base_dir().plus_file(path);
@@ -656,7 +656,7 @@ bool GDScript::_update_exports(bool *r_err, bool p_recursive_call, PlaceHolderSc
 					}
 				}
 
-				if (path != "") {
+				if (!path.is_empty()) {
 					if (path != get_path()) {
 						Ref<GDScript> bf = ResourceLoader::load(path);
 
@@ -809,11 +809,11 @@ Error GDScript::reload(bool p_keep_state) {
 
 	String basedir = path;
 
-	if (basedir == "") {
+	if (basedir.is_empty()) {
 		basedir = get_path();
 	}
 
-	if (basedir != "") {
+	if (!basedir.is_empty()) {
 		basedir = basedir.get_base_dir();
 	}
 
@@ -1122,7 +1122,7 @@ String GDScript::_get_gdscript_reference_class_name(const GDScript *p_gdscript)
 
 	String class_name;
 	while (p_gdscript) {
-		if (class_name == "") {
+		if (class_name.is_empty()) {
 			class_name = p_gdscript->get_script_class_name();
 		} else {
 			class_name = p_gdscript->get_script_class_name() + "." + class_name;
@@ -1433,7 +1433,7 @@ void GDScriptInstance::get_property_list(List<PropertyInfo> *p_properties) const
 					pinfo.type = Variant::Type(d["type"].operator int());
 					ERR_CONTINUE(pinfo.type < 0 || pinfo.type >= Variant::VARIANT_MAX);
 					pinfo.name = d["name"];
-					ERR_CONTINUE(pinfo.name == "");
+					ERR_CONTINUE(pinfo.name.is_empty());
 					if (d.has("hint")) {
 						pinfo.hint = PropertyHint(d["hint"].operator int());
 					}
diff --git a/modules/gdscript/gdscript_cache.cpp b/modules/gdscript/gdscript_cache.cpp
index e99bcddeb7..d0e85147f1 100644
--- a/modules/gdscript/gdscript_cache.cpp
+++ b/modules/gdscript/gdscript_cache.cpp
@@ -117,7 +117,7 @@ void GDScriptCache::remove_script(const String &p_path) {
 Ref<GDScriptParserRef> GDScriptCache::get_parser(const String &p_path, GDScriptParserRef::Status p_status, Error &r_error, const String &p_owner) {
 	MutexLock lock(singleton->lock);
 	Ref<GDScriptParserRef> ref;
-	if (p_owner != String()) {
+	if (!p_owner.is_empty()) {
 		singleton->dependencies[p_owner].insert(p_path);
 	}
 	if (singleton->parser_map.has(p_path)) {
@@ -163,7 +163,7 @@ String GDScriptCache::get_source_code(const String &p_path) {
 
 Ref<GDScript> GDScriptCache::get_shallow_script(const String &p_path, const String &p_owner) {
 	MutexLock lock(singleton->lock);
-	if (p_owner != String()) {
+	if (!p_owner.is_empty()) {
 		singleton->dependencies[p_owner].insert(p_path);
 	}
 	if (singleton->full_gdscript_cache.has(p_path)) {
@@ -186,7 +186,7 @@ Ref<GDScript> GDScriptCache::get_shallow_script(const String &p_path, const Stri
 Ref<GDScript> GDScriptCache::get_full_script(const String &p_path, Error &r_error, const String &p_owner) {
 	MutexLock lock(singleton->lock);
 
-	if (p_owner != String()) {
+	if (!p_owner.is_empty()) {
 		singleton->dependencies[p_owner].insert(p_path);
 	}
 
diff --git a/modules/gdscript/gdscript_compiler.cpp b/modules/gdscript/gdscript_compiler.cpp
index ab0fe5c37d..bba664c328 100644
--- a/modules/gdscript/gdscript_compiler.cpp
+++ b/modules/gdscript/gdscript_compiler.cpp
@@ -65,7 +65,7 @@ bool GDScriptCompiler::_is_class_member_property(GDScript *owner, const StringNa
 }
 
 void GDScriptCompiler::_set_error(const String &p_error, const GDScriptParser::Node *p_node) {
-	if (error != "") {
+	if (!error.is_empty()) {
 		return;
 	}
 
@@ -2020,7 +2020,7 @@ GDScriptFunction *GDScriptCompiler::_parse_function(Error &r_error, GDScript *p_
 	if (EngineDebugger::is_active()) {
 		String signature;
 		// Path.
-		if (p_script->get_path() != String()) {
+		if (!p_script->get_path().is_empty()) {
 			signature += p_script->get_path();
 		}
 		// Location.
@@ -2158,7 +2158,7 @@ Error GDScriptCompiler::_parse_class_level(GDScript *p_script, const GDScriptPar
 	p_script->tool = parser->is_tool();
 	p_script->name = p_class->identifier ? p_class->identifier->name : "";
 
-	if (p_script->name != "") {
+	if (!p_script->name.is_empty()) {
 		if (ClassDB::class_exists(p_script->name) && ClassDB::is_class_exposed(p_script->name)) {
 			_set_error("The class '" + p_script->name + "' shadows a native class", p_class);
 			return ERR_ALREADY_EXISTS;
@@ -2287,7 +2287,7 @@ Error GDScriptCompiler::_parse_class_level(GDScript *p_script, const GDScriptPar
 				p_script->constants.insert(name, constant->initializer->reduced_value);
 #ifdef TOOLS_ENABLED
 				p_script->member_lines[name] = constant->start_line;
-				if (constant->doc_description != String()) {
+				if (!constant->doc_description.is_empty()) {
 					p_script->doc_constants[name] = constant->doc_description;
 				}
 #endif
diff --git a/modules/gdscript/gdscript_editor.cpp b/modules/gdscript/gdscript_editor.cpp
index 71d2699c2e..34fe2364cb 100644
--- a/modules/gdscript/gdscript_editor.cpp
+++ b/modules/gdscript/gdscript_editor.cpp
@@ -1365,7 +1365,7 @@ static bool _guess_expression_type(GDScriptParser::CompletionContext &p_context,
 									String arg1 = args[0];
 									if (arg1.begins_with("/root/")) {
 										String which = arg1.get_slice("/", 2);
-										if (which != "") {
+										if (!which.is_empty()) {
 											// Try singletons first
 											if (GDScriptLanguage::get_singleton()->get_named_globals_map().has(which)) {
 												r_type = _type_from_variant(GDScriptLanguage::get_singleton()->get_named_globals_map()[which]);
@@ -2753,7 +2753,7 @@ void GDScriptLanguage::auto_indent_code(String &p_code, int p_from_line, int p_t
 		}
 
 		String st = l.substr(tc, l.length()).strip_edges();
-		if (st == "" || st.begins_with("#")) {
+		if (st.is_empty() || st.begins_with("#")) {
 			continue; //ignore!
 		}
 
diff --git a/modules/gdscript/gdscript_parser.cpp b/modules/gdscript/gdscript_parser.cpp
index fd6bd545c9..98a93a1a53 100644
--- a/modules/gdscript/gdscript_parser.cpp
+++ b/modules/gdscript/gdscript_parser.cpp
@@ -3100,7 +3100,7 @@ void GDScriptParser::get_class_doc_comment(int p_line, String &p_brief, String &
 	if (!comments.has(p_line)) {
 		return;
 	}
-	ERR_FAIL_COND(p_brief != "" || p_desc != "" || p_tutorials.size() != 0);
+	ERR_FAIL_COND(!p_brief.is_empty() || !p_desc.is_empty() || p_tutorials.size() != 0);
 
 	int line = p_line;
 	bool in_codeblock = false;
@@ -3132,7 +3132,7 @@ void GDScriptParser::get_class_doc_comment(int p_line, String &p_brief, String &
 		String striped_line = doc_line.strip_edges();
 
 		// Set the read mode.
-		if (striped_line.begins_with("@desc:") && p_desc == "") {
+		if (striped_line.begins_with("@desc:") && p_desc.is_empty()) {
 			mode = DESC;
 			striped_line = striped_line.trim_prefix("@desc:");
 			in_codeblock = _in_codeblock(doc_line, in_codeblock);
diff --git a/modules/gdscript/gdscript_vm.cpp b/modules/gdscript/gdscript_vm.cpp
index 6dd8c3e0dd..be9e5df2b0 100644
--- a/modules/gdscript/gdscript_vm.cpp
+++ b/modules/gdscript/gdscript_vm.cpp
@@ -755,7 +755,7 @@ Variant GDScriptFunction::call(GDScriptInstance *p_instance, const Variant **p_a
 #ifdef DEBUG_ENABLED
 				if (!valid) {
 					String v = index->operator String();
-					if (v != "") {
+					if (!v.is_empty()) {
 						v = "'" + v + "'";
 					} else {
 						v = "of type '" + _get_var_type(index) + "'";
@@ -785,7 +785,7 @@ Variant GDScriptFunction::call(GDScriptInstance *p_instance, const Variant **p_a
 #ifdef DEBUG_ENABLED
 				if (!valid) {
 					String v = index->operator String();
-					if (v != "") {
+					if (!v.is_empty()) {
 						v = "'" + v + "'";
 					} else {
 						v = "of type '" + _get_var_type(index) + "'";
@@ -817,7 +817,7 @@ Variant GDScriptFunction::call(GDScriptInstance *p_instance, const Variant **p_a
 #ifdef DEBUG_ENABLED
 				if (oob) {
 					String v = index->operator String();
-					if (v != "") {
+					if (!v.is_empty()) {
 						v = "'" + v + "'";
 					} else {
 						v = "of type '" + _get_var_type(index) + "'";
@@ -848,7 +848,7 @@ Variant GDScriptFunction::call(GDScriptInstance *p_instance, const Variant **p_a
 #ifdef DEBUG_ENABLED
 				if (!valid) {
 					String v = index->operator String();
-					if (v != "") {
+					if (!v.is_empty()) {
 						v = "'" + v + "'";
 					} else {
 						v = "of type '" + _get_var_type(index) + "'";
@@ -884,7 +884,7 @@ Variant GDScriptFunction::call(GDScriptInstance *p_instance, const Variant **p_a
 #ifdef DEBUG_ENABLED
 				if (!valid) {
 					String v = key->operator String();
-					if (v != "") {
+					if (!v.is_empty()) {
 						v = "'" + v + "'";
 					} else {
 						v = "of type '" + _get_var_type(key) + "'";
@@ -917,7 +917,7 @@ Variant GDScriptFunction::call(GDScriptInstance *p_instance, const Variant **p_a
 #ifdef DEBUG_ENABLED
 				if (oob) {
 					String v = index->operator String();
-					if (v != "") {
+					if (!v.is_empty()) {
 						v = "'" + v + "'";
 					} else {
 						v = "of type '" + _get_var_type(index) + "'";
@@ -3295,20 +3295,20 @@ Variant GDScriptFunction::call(GDScriptInstance *p_instance, const Variant **p_a
 		//error
 		// function, file, line, error, explanation
 		String err_file;
-		if (p_instance && ObjectDB::get_instance(p_instance->owner_id) != nullptr && p_instance->script->is_valid() && p_instance->script->path != "") {
+		if (p_instance && ObjectDB::get_instance(p_instance->owner_id) != nullptr && p_instance->script->is_valid() && !p_instance->script->path.is_empty()) {
 			err_file = p_instance->script->path;
 		} else if (script) {
 			err_file = script->path;
 		}
-		if (err_file == "") {
+		if (err_file.is_empty()) {
 			err_file = "<built-in>";
 		}
 		String err_func = name;
-		if (p_instance && ObjectDB::get_instance(p_instance->owner_id) != nullptr && p_instance->script->is_valid() && p_instance->script->name != "") {
+		if (p_instance && ObjectDB::get_instance(p_instance->owner_id) != nullptr && p_instance->script->is_valid() && !p_instance->script->name.is_empty()) {
 			err_func = p_instance->script->name + "." + err_func;
 		}
 		int err_line = line;
-		if (err_text == "") {
+		if (err_text.is_empty()) {
 			err_text = "Internal script error! Opcode: " + itos(last_opcode) + " (please report).";
 		}
 
diff --git a/modules/gdscript/tests/gdscript_test_runner.cpp b/modules/gdscript/tests/gdscript_test_runner.cpp
index d2e71efee7..21883b3c6e 100644
--- a/modules/gdscript/tests/gdscript_test_runner.cpp
+++ b/modules/gdscript/tests/gdscript_test_runner.cpp
@@ -267,7 +267,7 @@ bool GDScriptTestRunner::generate_class_index() {
 		String base_type;
 
 		String class_name = GDScriptLanguage::get_singleton()->get_global_class_name(test.get_source_file(), &base_type);
-		if (class_name == String()) {
+		if (class_name.is_empty()) {
 			continue;
 		}
 		ERR_FAIL_COND_V_MSG(ScriptServer::is_global_class(class_name), false,