LuaCall.h

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// Copyright © 2008-2021 Pioneer Developers. See AUTHORS.txt for details
// Licensed under the terms of the GPL v3. See licenses/GPL-3.txt
 
#pragma once
 
/*
    This file implements a generic method to call a C++ member function with
    arguments passed in from Lua. It's intended to back a generic method of
    binding code to Lua with minimal boilerplate needed.
*/
 
#include "Lua.h"
#include "LuaPushPull.h"
 
// Backend to bind call a C++ member function with arguments from Lua.
// Parameter `index` points one-behind the first argument, where the object
// pointer should traditionally be
 
template<class T, typename Ret>
Ret pi_lua_multiple_call(lua_State *l, int index, T *ptr, Ret (T::*fn)())
{
    return (ptr->*fn)();
}
 
template<class T, typename Ret, typename Arg1>
Ret pi_lua_multiple_call(lua_State *l, int index, T *ptr, Ret (T::*fn)(Arg1))
{
    auto arg1 = LuaPull<Arg1>(l, index+1);
    return (ptr->*fn)(arg1);
}
 
template<class T, typename Ret, typename Arg1, typename Arg2>
Ret pi_lua_multiple_call(lua_State *l, int index, T *ptr, Ret (T::*fn)(Arg1, Arg2))
{
    auto arg1 = LuaPull<Arg1>(l, index+1);
    auto arg2 = LuaPull<Arg2>(l, index+2);
    return (ptr->*fn)(arg1, arg2);
}
 
template<class T, typename Ret, typename Arg1, typename Arg2, typename Arg3>
Ret pi_lua_multiple_call(lua_State *l, int index, T *ptr, Ret (T::*fn)(Arg1, Arg2, Arg3))
{
    auto arg1 = LuaPull<Arg1>(l, index+1);
    auto arg2 = LuaPull<Arg2>(l, index+2);
    auto arg3 = LuaPull<Arg3>(l, index+3);
    return (ptr->*fn)(arg1, arg2, arg3);
}
 
template<class T, typename Ret, typename Arg1, typename Arg2, typename Arg3, typename Arg4>
Ret pi_lua_multiple_call(lua_State *l, int index, T *ptr, Ret (T::*fn)(Arg1, Arg2, Arg3, Arg4))
{
    auto arg1 = LuaPull<Arg1>(l, index+1);
    auto arg2 = LuaPull<Arg2>(l, index+2);
    auto arg3 = LuaPull<Arg3>(l, index+3);
    auto arg4 = LuaPull<Arg4>(l, index+4);
    return (ptr->*fn)(arg1, arg2, arg3, arg4);
}
 
template<class T, typename Ret, typename Arg1, typename Arg2, typename Arg3, typename Arg4, typename Arg5>
Ret pi_lua_multiple_call(lua_State *l, int index, T *ptr, Ret (T::*fn)(Arg1, Arg2, Arg3, Arg4, Arg5))
{
    auto arg1 = LuaPull<Arg1>(l, index+1);
    auto arg2 = LuaPull<Arg2>(l, index+2);
    auto arg3 = LuaPull<Arg3>(l, index+3);
    auto arg4 = LuaPull<Arg4>(l, index+4);
    auto arg5 = LuaPull<Arg5>(l, index+5);
    return (ptr->*fn)(arg1, arg2, arg3, arg4, arg5);
}
 
template<class T, typename Ret, typename Arg1, typename Arg2, typename Arg3, typename Arg4, typename Arg5, typename Arg6>
Ret pi_lua_multiple_call(lua_State *l, int index, T *ptr, Ret (T::*fn)(Arg1, Arg2, Arg3, Arg4, Arg5, Arg6))
{
    auto arg1 = LuaPull<Arg1>(l, index+1);
    auto arg2 = LuaPull<Arg2>(l, index+2);
    auto arg3 = LuaPull<Arg3>(l, index+3);
    auto arg4 = LuaPull<Arg4>(l, index+4);
    auto arg5 = LuaPull<Arg5>(l, index+5);
    auto arg6 = LuaPull<Arg6>(l, index+6);
    return (ptr->*fn)(arg1, arg2, arg3, arg4, arg5, arg6);
}
 
template<class T, typename Ret, typename Arg1, typename Arg2, typename Arg3, typename Arg4, typename Arg5, typename Arg6, typename Arg7>
Ret pi_lua_multiple_call(lua_State *l, int index, T *ptr, Ret (T::*fn)(Arg1, Arg2, Arg3, Arg4, Arg5, Arg6, Arg7))
{
    auto arg1 = LuaPull<Arg1>(l, index+1);
    auto arg2 = LuaPull<Arg2>(l, index+2);
    auto arg3 = LuaPull<Arg3>(l, index+3);
    auto arg4 = LuaPull<Arg4>(l, index+4);
    auto arg5 = LuaPull<Arg5>(l, index+5);
    auto arg6 = LuaPull<Arg6>(l, index+6);
    auto arg7 = LuaPull<Arg7>(l, index+7);
    return (ptr->*fn)(arg1, arg2, arg3, arg4, arg5, arg6, arg7);
}
 
// Pull an object and arguments for the passed function from Lua.
// Intended to ease the amount of boilerplate code needed to bind a method to Lua.
 
template<class T, typename Ret, typename ...Args>
Ret pi_lua_generic_call(lua_State *l, int index, Ret (T::*fn)(Args...))
{
    T *ptr = LuaPull<T>(l, index);
    return pi_lua_multiple_call<T, Ret, Args...>(l, index, ptr, fn);
}