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LuaFunction.inl
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LuaFunction.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 "LuaStack.hpp"
#include <iterator>
namespace LuaLink
{
namespace detail {
namespace LuaFunction {
//Struct form of wrapper/callbacks, necessary to keep a lookup table of all wrappers/callbacks
struct Unsafe_LuaFunc{
Unsafe_LuaFunc(WrapperDoubleArg w1, WrapperSingleArg w2, void* cb) : pWrapper(w1), pWrapperSingle(w2), pFunc(cb){}
WrapperDoubleArg pWrapper; //Used for calls to overloaded member functions
WrapperSingleArg pWrapperSingle; //Used for calls to non-overloaded member functions
void* pFunc; //Serves as callback, discards type, wrappers restore type
};
extern void Register_Impl(Unsafe_LuaFunc&&,const char*);
}
}
template<typename _RetType, typename... _ArgTypes>
// // Add a C++ member function to the appropriate lookup table
void LuaFunction::Register(_RetType(*pFunc)(_ArgTypes...), const char* name)
{
using namespace detail;
using namespace detail::LuaFunction;
detail::LuaFunction::Register_Impl(Unsafe_LuaFunc(
FunctionWrapper<_RetType, _ArgTypes...>::execute,
FunctionWrapper<_RetType, _ArgTypes...>::execute,
reinterpret_cast<void*>(pFunc)), name);
}
}
namespace LuaLink {
#ifdef LUALINK_DEFINE
namespace detail {
namespace LuaFunction {
std::map<const char*, std::vector<Unsafe_LuaFunc>, CStrCmp>& LuaFunctionMap() {
static std::map<const char*, std::vector<Unsafe_LuaFunc>, CStrCmp> s;
return s;
}
std::vector<Unsafe_LuaFunc>& LuaFunctionTable() {
static std::vector<Unsafe_LuaFunc> s;
return s;
}
void Register_Impl(Unsafe_LuaFunc&& func, const char* name) {
auto it = LuaFunctionMap().find(name);
if( it == LuaFunctionMap().end() )
it = LuaFunctionMap().insert(make_pair(name, std::vector<Unsafe_LuaFunc>() ) ).first;
it->second.push_back(func);
}
}
}
// // Pushes all registered functions to the Lua environment
void LuaFunction::Commit(lua_State* pLuaState)
{
using namespace detail::LuaFunction;
for(auto& elem : LuaFunctionMap()) {
//No overloading
if(elem.second.size() == 1){
lua_pushlightuserdata(pLuaState, elem.second[0].pFunc);
lua_pushcclosure(pLuaState, elem.second[0].pWrapperSingle, 1);
lua_setglobal(pLuaState, elem.first );
continue;
}
//Copy function objects to table
size_t startIdx = LuaFunctionTable().size();
size_t endIdx = startIdx + elem.second.size();
std::move(elem.second.begin(), elem.second.end(), std::insert_iterator<std::vector<Unsafe_LuaFunc>>(LuaFunctionTable(), LuaFunctionTable().end()));
//Push start and end indices
lua_pushinteger(pLuaState, (lua_Integer)startIdx);
lua_pushinteger(pLuaState, (lua_Integer)endIdx);
//Push closure
lua_pushcclosure(pLuaState, LuaFunctionDispatch, 2);
lua_setglobal(pLuaState, elem.first);
}
LuaFunctionMap().clear();
}
// // Throws out all references to functions that are left over from previous commits
void LuaFunction::Release(void)
{
using namespace detail::LuaFunction;
if(!LuaFunctionTable().empty())
LuaFunctionTable().clear();
}
// Tries out all overloads until it finds an overload that matches the arguments used in the Lua call
int LuaFunction::LuaFunctionDispatch(lua_State* L)
{
using namespace detail::LuaFunction;
auto startIdx = static_cast<int>( lua_tointeger( L, lua_upvalueindex(1) ) );
auto endIdx = static_cast<int>( lua_tointeger( L, lua_upvalueindex(2) ) );
for(auto i = startIdx; i < endIdx; ++i){
auto ret = LuaFunctionTable()[i].pWrapper(L, LuaFunctionTable()[i].pFunc, OverloadedErrorHandling);
if(ret < 0)
continue;
return ret;
}
return luaL_error(L, "Invalid function call");
}
int LuaFunction::DefaultErrorHandling(lua_State* L, int narg) { return narg == 0 ? luaL_error(L, "Bad # of arguments") : luaL_argerror(L, narg,""); }
int LuaFunction::OverloadedErrorHandling(lua_State* L, int narg){ return -1; }
#endif //LUALINK_DEFINE
// CALLBACK WRAPPERS
#define EXECUTE_V2 static int execute(lua_State* pLuaState){return execute(pLuaState, lua_touserdata( pLuaState, lua_upvalueindex(1) ), ::LuaLink::LuaFunction::DefaultErrorHandling);}
namespace detail {
//functionwrapper
//ret, n args
template<typename _RetType, typename... _ArgTypes>
struct FunctionWrapper
{
typedef _RetType(*CbType)(_ArgTypes...);
static int execute(lua_State* pLuaState, void* fn, ArgErrorCbType onArgError)
{
bool isOk = lua_gettop(pLuaState) == sizeof...(_ArgTypes);
if(!isOk)
return onArgError(pLuaState, 0);
int err = 0;
auto tpl = build_tuple_from_lua_stack<_ArgTypes...>::execute(pLuaState, 1, isOk, onArgError, err);
if(!isOk)
return err;
LuaStack::pushVariable<_RetType>( pLuaState, call(reinterpret_cast<CbType>(fn), tpl) );
return 1;
}
EXECUTE_V2
};
//no ret, n args
template<typename... _ArgTypes>
struct FunctionWrapper<void, _ArgTypes...>
{
typedef void(*CbType)(_ArgTypes...);
static int execute(lua_State* pLuaState, void* fn, ArgErrorCbType onArgError)
{
bool isOk = lua_gettop(pLuaState) == sizeof...(_ArgTypes);
if(!isOk)
return onArgError(pLuaState, 0);
int err = 0;
auto tpl = build_tuple_from_lua_stack<_ArgTypes...>::execute(pLuaState, 1, isOk, onArgError, err);
if(!isOk)
return err;
call(reinterpret_cast<CbType>(fn), tpl);
return 0;
}
EXECUTE_V2
};
//ret, 0 arg
template<typename _RetType>
struct FunctionWrapper<_RetType>
{
typedef _RetType(*CbType)(void);
static int execute(lua_State* pLuaState, void* fn, ArgErrorCbType onArgError)
{
if(lua_gettop(pLuaState) != 0) //argc
return onArgError(pLuaState, 0);
LuaStack::pushVariable<_RetType>( pLuaState, reinterpret_cast<CbType>(fn)() );
return 1;
}
EXECUTE_V2
};
//no ret, 0 arg
template<>struct FunctionWrapper<void>
{
typedef void(*CbType)(void);
static int execute(lua_State* pLuaState, void* fn, ArgErrorCbType onArgError)
{
if(lua_gettop(pLuaState) != 0) //argc
return onArgError(pLuaState, 0);
reinterpret_cast<CbType>(fn)();
return 0;
}
EXECUTE_V2
};
}
#undef EXECUTE_V2
}