source: orxonox.OLD/branches/script_engine/src/lib/script_engine/luna.h @ 7820

/*
 * Lenny Palozzi - lenny.palozzi@home.com
 */

#include <string>
#include <iostream>

#include "luaincl.h"

/*extern "C" {
#include <lua.h>
}
*/
template <class T>
class Luna
{


 public:
   /* member function map */
   struct RegType {
      const char* name;
      int(T::*mfunc)(lua_State*);
   };
   /* register class T */
   static void Register(lua_State* L) {
      lua_pushcfunction(L, &Luna<T>::constructor);
      lua_setglobal(L, T::className);


     /* if (otag == 0) {
        otag = lua_newtag(L);
        lua_pushcfunction(L, &Luna<T>::gc_obj);
        lua_settagmethod(L, otag, "gc"); /* tm to release objects
      }*/
   }

 private:
   static int otag; /* object tag */

   /* member function dispatcher */
   static int thunk(lua_State* L) {
      /* stack = closure(-1), [args...], 'self' table(1) */
      //int i = static_cast<int>(lua_tonumber(L,-1));

       int i = lua_upvalueindex (1);

      //lua_pushnumber(L, 0); /* userdata object at index 0 */
      //lua_gettable(L, 1);
      lua_rawgeti (L, 1, 0);
      T* obj = (T*)(lua_touserdata(L,-1));
      lua_pop(L, 1); /* pop closure value and obj */

        printf("FUNCTION:: %d\n", i );
        printf("OBJECT %p\n", obj);


      return (obj->*(T::Register[i].mfunc))(L);
   }


    static int setScriptable(T* obj)
     {
     //return registerObject(obj);
     }

   static int setScriptable(const std::string& objectName)
    {
   //#warning 'implement do not use'
  //   return registerObject(obj);
    }

   /* constructs T objects */
   static int constructor(lua_State* L) {
      T* obj= new T(L); /* new T */
       printf("OBJECT CREATED %p\n", obj);

      return registerObject(obj, L);
   }


   /* releases objects */
   static int gc_obj(lua_State* L) {
      T* obj = static_cast<T*>(lua_touserdata(L, -1));
      delete obj;
      return 0;
   }
 protected:
   Luna(); /* hide default constructor */

 private:

   static int registerObject(T* obj, lua_State* L)
    {
      lua_newtable(L); /* new table object */
      //int  objRef = luaL_ref (L, LUA_REGISTRYINDEX);

      //lua_pushnumber(L, 0); /* userdata obj at index 0 */
      //lua_rawgeti(L, LUA_REGISTRYINDEX, objRef);
      lua_pushlightuserdata(L, obj);
      lua_rawseti(L,-2,0);
      //lua_pushusertag(L, obj, otag); /* have gc call tm */
      //lua_settable(L, -3);
      //std::cout<<"test"<<std::endl;

    /* Set up garbage collection
      if(lua_getmetatable(L, objRef) != 0)
       {
        //std::cout<<"test"<<std::endl;
        lua_pushstring (L, "__gc");
        lua_pushcfunction(L, &Luna<T>::gc_obj);
        lua_settable(L,-3);
       }
    */
      //lua_rawgeti (L, LUA_REGISTRYINDEX, objRef);
      /* register the member functions */
      for (int i=0; T::Register[i].name; i++)
      {
         lua_pushstring(L, T::Register[i].name);
         lua_pushnumber(L, i);
         lua_pushcclosure(L, &Luna<T>::thunk, 1);
         lua_settable(L,-3);
      }
      return 1; /* return the table object */
}


};
template <class T>
int Luna<T>::otag = 0;