Lua 클래스 상속 실현

 
  
 --[[ 
  
 author:[email protected] 
  
 date:2014/7/18 
  
 purpose:lua      
  
 --]] 
  
 --- base class "Object" 
  
 local Object = {_t = "Object"} 
  
 function Object:new(id) 
  
     local o = 
  
     { 
  
         _id = id 
  
     } 
  
     setmetatable(o, self) 
  
     self.__index = self 
  
     return o 
  
 end 
  
 function Object:type() 
  
     return self._t 
  
 end 
  
 function Object:id() 
  
     return self._id 
  
 end 
  
 --- class "Widget" driver from "Object" 
  
 local Widget = {_t = "Widget"} 
  
 setmetatable(Widget, Object) 
  
 function Widget:new(id) 
  
     local o = 
  
     { 
  
         _id = id, 
  
     } 
  
     setmetatable(o, self) 
  
     self.__index = self 
  
     -- function (tb, key) 
  
     --  return self[key] 
  
     -- end 
  
     return o 
  
 end 
  
 -- function Widget:id() 
  
 --  return self._id 
  
 -- end 
  
 --- class "Drawor" driver from "Object" 
  
 local Drawor = {_t = "Drawor"} 
  
 setmetatable(Drawor, Object) 
  
 function Drawor:new(id, name) 
  
     local o = 
  
     { 
  
         _id = id, 
  
         _name = name, 
  
     } 
  
     setmetatable(o, self) 
  
     self.__index = self 
  
     return o 
  
 end 
  
 function Drawor:name() 
  
     return self._name 
  
 end 
  
 --- class "DrawPlane" driver from "Widget" and "Drawor" 
  
 local DrawPlane = {_t = "DrawPlane", _father = {Widget, Drawor}} 
  
 function DrawPlane:new(id) 
  
     local o = 
  
     { 
  
         _id = id, 
  
     } 
  
     setmetatable(o, self) 
  
     self.__index = 
  
     function (tb, key) 
  
         if self[key] then return self[key] end 
  
         for _, v in pairs(self._father) do 
  
             if v._t == key then return v end 
  
             if v[key] then return v[key] end 
  
         end 
  
     end 
  
     return o 
  
 end 
  
 local varA = Object:new() 
  
 local varB = Widget:new(10) 
  
 local varC = Drawor:new(30, "dwr") 
  
 local varD = DrawPlane:new(51) 
  
 print("varA type:", varA:type()) 
  
 print("varB type:", varB:type()) 
  
 print("varB._id: ", varB._id, varB:id()) 
  
 print("varC name: ", varC:name()) 
  
 print("varD type: ", varD:type()) 
  
 print("varD id: ", varD:id()) 
  
 print("varD father Widget--", varD.Widget:type())