Upd

data/scripts/game_utils.lua

@@ -0,0 +1,18 @@
+-- http://lua-users.org/wiki/InheritanceTutorial
+
+function merge_table( baseClass, newClass )
+	for k, v in pairs( baseClass ) do
+		if type( v ) == "table" then
+			newClass[ k ] = newClass[ k ] or {}
+			merge_table( v, newClass[ k ] )
+		else
+			newClass[ k ] = v
+		end
+	end
+end
+
+function inherit_table( baseClass )
+	local newClass = {}
+	merge_table( baseClass, newClass )
+	return newClass
+end