Consolidate API object code (#12728)

Co-authored-by: sfan5 <sfan5@live.de>

1 files changed, 23 insertions, 0 deletions

diff --git a/src/script/lua_api/l_base.cpp b/src/script/lua_api/l_base.cpp
index f842671b8..03d8ee62d 100644
--- a/src/script/lua_api/l_base.cpp
+++ b/src/script/lua_api/l_base.cpp
@@ -100,6 +100,29 @@ bool ModApiBase::registerFunction(lua_State *L, const char *name,
 	return true;
 }
 
+void ModApiBase::registerClass(lua_State *L, const char *name,
+		const luaL_Reg *methods,
+		const luaL_Reg *metamethods)
+{
+	luaL_newmetatable(L, name);
+	luaL_register(L, NULL, metamethods);
+	int metatable = lua_gettop(L);
+
+	lua_newtable(L);
+	luaL_register(L, NULL, methods);
+	int methodtable = lua_gettop(L);
+
+	lua_pushvalue(L, methodtable);
+	lua_setfield(L, metatable, "__index");
+
+	// Protect the real metatable.
+	lua_pushvalue(L, methodtable);
+	lua_setfield(L, metatable, "__metatable");
+
+	// Pop methodtable and metatable.
+	lua_pop(L, 2);
+}
+
 int ModApiBase::l_deprecated_function(lua_State *L, const char *good, const char *bad, lua_CFunction func)
 {
 	thread_local std::vector<u64> deprecated_logged;