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LuaClass.inl
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LuaClass.inl
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// Copyright � 2013 Tom Tondeur
//
// This file is part of LuaLink.
//
// LuaLink is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// LuaLink is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with LuaLink. If not, see <http://www.gnu.org/licenses/>.
#include "LuaMethod.hpp"
#include "LuaStaticMethod.hpp"
#include "LuaVariable.hpp"
#include "LuaScript.hpp"
namespace LuaLink
{
template<typename T>
struct cast_from {
template<typename U>
static U static__cast(const T& t)
{
return static_cast<U>(t);
}
template<typename U>
static U reinterpret__cast(const T& t)
{
return reinterpret_cast<U>(t);
}
template<typename U>
static U dynamic__cast(const T& t)
{
return dynamic_cast<U>(t);
}
};
template <typename T>
const char* LuaClass<T>::s_ClassName = nullptr;
template <typename T>
void(*LuaClass<T>::s_fn_inst_reg)(T*) = nullptr;
template <typename T>
// // Registers Class T in the Lua environment
void LuaClass<T>::Register(const char* className, bool bAllowInheritance)
{
Register(className, bAllowInheritance, T::RegisterStaticsAndMethods,
cast_from<void(*)(T*)>::template reinterpret__cast<void(*)(void*)>(T::RegisterVariables));
}
template<typename T>
void LuaClass<T>::Register(const char* className, bool bAllowInheritance, void(*fn_static_reg)(void), void(*fn_inst_reg)(void*))
{
s_ClassName = className;
s_fn_inst_reg = reinterpret_cast<void(*)(T*)>(fn_inst_reg);
lua_State* L = LuaScript::GetLuaState();
LuaVariable::Commit(L); //Flush any global variables that may be registered, just in case
//Create new table
lua_newtable(L);
//Push metamethods
//
lua_pushstring(L, "__gc");
lua_pushcfunction(L, gc_obj);
lua_settable(L, -3);
lua_pushstring(L, "__tostring");
lua_pushcfunction(L, to_string);
lua_settable(L, -3);
//self.__index = self => when used as metatable, missing identifiers will be looked up in this table
lua_pushstring(L,"__index");
lua_pushvalue(L,-2);
lua_settable(L,-3);
//enable/disable inheritance
lua_pushstring(L, "inherit");
lua_pushcfunction(L, bAllowInheritance ? returnDerived : noInheritance);
lua_settable(L,-3);
T::RegisterStaticsAndMethods();
LuaStaticMethod<T>::CommitConstructors(L, -3, ConstructorWrapper, ConstructorWrapper);
LuaStaticMethod<T>::Commit(L, -3);
LuaMethod<T>::Commit(L, -3);
LuaVariable::Commit(L);
//Set table name (pops table)
lua_setglobal(L, s_ClassName);
}
template <typename T>
int LuaClass<T>::ConstructorWrapper(lua_State * L)
{
return ConstructorWrapper(L,
reinterpret_cast<detail::WrapperDoubleArg>(LuaStack::getVariable<void*>( L, lua_upvalueindex(1) ) ),
LuaStack::getVariable<void*>( L, lua_upvalueindex(2) ),
LuaFunction::DefaultErrorHandling);
}
template <typename T>
int LuaClass<T>::ConstructorWrapper(lua_State * L, detail::WrapperDoubleArg pWrapper, void* pFunc, detail::ArgErrorCbType onArgError)
{
//Create new object
if(pWrapper(L, pFunc, onArgError) == -1)
return onArgError(L, 0);
T* pObj = static_cast<T*>( LuaStack::getVariable<void*>( L, -1) );
lua_newtable(L); //Create new table
//Add core_ entry to the table
lua_pushstring(L,"core_");
T** memLoc = static_cast<T**>(lua_newuserdata(L, sizeof(T *))); // Push new userdata value
*memLoc = pObj; //Userdata should point to our newly allocated object
lua_settable(L,-3);
//Push nonstatic properties
T::RegisterVariables(pObj);
LuaVariable::Commit(L,-3);
//Set the class table as metatable for this object
lua_getglobal(L, s_ClassName);
lua_setmetatable(L, -2);
return 1; //Return 1 value, our new table
}
template <typename T>
//Metamethod, called when garbage collector gets rid of our object
int LuaClass<T>::gc_obj(lua_State * L)
{
//Retrieve C++ object
lua_pushstring(L, "core_");
lua_rawget(L, 1);
T** ppObj = static_cast < T ** >(lua_touserdata(L, -1));
//Delete object
if(ppObj)
delete *ppObj;
return 0; //No return value
}
template <typename T>
//Metamethod, called when converting our object to a string
int LuaClass<T>::to_string(lua_State* L)
{
lua_pushstring(L,"core_");
lua_rawget(L,1);
T** ppObj = static_cast<T**>(lua_touserdata(L, -1));
if(ppObj)
lua_pushfstring(L, "%s (%p)", s_ClassName, (void*)*ppObj);
else
lua_pushfstring(L,"Empty %s object", s_ClassName);
return 1; //Return 1 string
}
template<typename T>
int LuaClass<T>::returnDerived(lua_State* L)
{
//Create new empty table
lua_newtable(L);
//Transfer metamethods
//
lua_pushstring(L,"__gc");
lua_pushcfunction(L, gc_obj);
lua_settable(L,-3);
lua_pushstring(L, "__tostring");
lua_pushcfunction(L, to_string);
lua_settable(L, -3);
//self.__index = self => when used as metatable, missing identifiers will be looked up in this table
lua_pushstring(L,"__index");
lua_pushvalue(L,-2);
lua_settable(L,-3);
//Set our class as metatable for the new object
lua_getglobal(L,s_ClassName);
lua_setmetatable(L,-2);
return 1;
}
template<typename T>
int LuaClass<T>::noInheritance(lua_State* L)
{
return luaL_error(L, "It is illegal to inherit from this class");
}
}