Disallow class names to be the same as global names

Also forbid autoloads to have the same name as global script class.

1 files changed, 12 insertions, 1 deletions

diff --git a/modules/gdscript/gdscript_analyzer.cpp b/modules/gdscript/gdscript_analyzer.cpp
index fc0bef3ba2..f4ed327e71 100644
--- a/modules/gdscript/gdscript_analyzer.cpp
+++ b/modules/gdscript/gdscript_analyzer.cpp
@@ -171,7 +171,7 @@ Error GDScriptAnalyzer::check_native_member_name_conflict(const StringName &p_me
 	}
 
 	if (class_exists(p_member_name)) {
-		push_error(vformat(R"(The class "%s" shadows a native class.)", p_member_name), p_member_node);
+		push_error(vformat(R"(The member "%s" shadows a native class.)", p_member_name), p_member_node);
 		return ERR_PARSE_ERROR;
 	}
 
@@ -218,6 +218,17 @@ Error GDScriptAnalyzer::resolve_inheritance(GDScriptParser::ClassNode *p_class,
 		p_class->fqcn = p_class->outer->fqcn + "::" + String(p_class->identifier->name);
 	}
 
+	if (p_class->identifier) {
+		StringName class_name = p_class->identifier->name;
+		if (class_exists(class_name)) {
+			push_error(vformat(R"(Class "%s" hides a native class.)", class_name), p_class->identifier);
+		} else if (ScriptServer::is_global_class(class_name) && (ScriptServer::get_global_class_path(class_name) != parser->script_path || p_class != parser->head)) {
+			push_error(vformat(R"(Class "%s" hides a global script class.)", class_name), p_class->identifier);
+		} else if (ProjectSettings::get_singleton()->has_autoload(class_name) && ProjectSettings::get_singleton()->get_autoload(class_name).is_singleton) {
+			push_error(vformat(R"(Class "%s" hides an autoload singleton.)", class_name), p_class->identifier);
+		}
+	}
+
 	GDScriptParser::DataType result;
 
 	// Set datatype for class.