call_function.hpp

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// Copyright (c) 2003 Daniel Wallin and Arvid Norberg

// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the "Software"),
// to deal in the Software without restriction, including without limitation
// the rights to use, copy, modify, merge, publish, distribute, sublicense,
// and/or sell copies of the Software, and to permit persons to whom the
// Software is furnished to do so, subject to the following conditions:

// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.

// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF
// ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
// TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
// PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT
// SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR
// ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
// ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE
// OR OTHER DEALINGS IN THE SOFTWARE.


#if !BOOST_PP_IS_ITERATING

#ifndef LUABIND_CALL_FUNCTION_HPP_INCLUDED
#define LUABIND_CALL_FUNCTION_HPP_INCLUDED

#include <luabind/config.hpp>

#include <boost/mpl/if.hpp>
#include <boost/tuple/tuple.hpp>
#include <boost/mpl/or.hpp>
#include <boost/preprocessor/repeat.hpp>
#include <boost/preprocessor/iteration/iterate.hpp>
#include <boost/preprocessor/repetition/enum.hpp> 
#include <boost/preprocessor/repetition/enum_params.hpp>
#include <boost/preprocessor/repetition/enum_binary_params.hpp>
#include <boost/preprocessor/punctuation/comma_if.hpp>

#include <luabind/error.hpp>
#include <luabind/detail/convert_to_lua.hpp>
#include <luabind/detail/pcall.hpp>

namespace luabind
{
	namespace detail
	{

		// if the proxy_function_caller returns non-void
			template<class Ret, class Tuple>
			class proxy_function_caller
			{
//			friend class luabind::object;
			public:

				typedef int(*function_t)(lua_State*, int, int);

				proxy_function_caller(
					lua_State* L
					, int params
					, function_t fun
					, const Tuple args)
					: m_state(L)
					, m_params(params)
					, m_fun(fun)
					, m_args(args)
					, m_called(false)
				{
				}

				proxy_function_caller(const proxy_function_caller& rhs)
					: m_state(rhs.m_state)
					, m_params(rhs.m_params)
					, m_fun(rhs.m_fun)
					, m_args(rhs.m_args)
					, m_called(rhs.m_called)
				{
					rhs.m_called = true;
				}

				~proxy_function_caller()
				{
					if (m_called) return;

					m_called = true;
					lua_State* L = m_state;

					int top = lua_gettop(L);

					push_args_from_tuple<1>::apply(L, m_args);
					if (m_fun(L, boost::tuples::length<Tuple>::value, 0))
					{
						assert(lua_gettop(L) == top - m_params + 1);
#ifndef LUABIND_NO_EXCEPTIONS
						throw luabind::error(L);
#else
						error_callback_fun e = get_error_callback();
						if (e) e(L);

						assert(0 && "the lua function threw an error and exceptions are disabled."
									" If you want to handle the error you can use luabind::set_error_callback()");
						std::terminate();

#endif
					}

					// pops the return values from the function call
					stack_pop pop(L, lua_gettop(L) - top + m_params);
				}

				operator Ret()
				{
					typename mpl::apply_wrap2<default_policy,Ret,lua_to_cpp>::type converter;

					m_called = true;
					lua_State* L = m_state;

					int top = lua_gettop(L);

					push_args_from_tuple<1>::apply(L, m_args);
					if (m_fun(L, boost::tuples::length<Tuple>::value, 1))
					{
						assert(lua_gettop(L) == top - m_params + 1);
#ifndef LUABIND_NO_EXCEPTIONS
						throw luabind::error(L); 
#else
						error_callback_fun e = get_error_callback();
						if (e) e(L);
	
						assert(0 && "the lua function threw an error and exceptions are disabled."
								" If you want to handle the error you can use luabind::set_error_callback()");
						std::terminate();
#endif
					}

					// pops the return values from the function call
					stack_pop pop(L, lua_gettop(L) - top + m_params);

#ifndef LUABIND_NO_ERROR_CHECKING

					if (converter.match(L, LUABIND_DECORATE_TYPE(Ret), -1) < 0)
					{
#ifndef LUABIND_NO_EXCEPTIONS
						throw cast_failed(L, LUABIND_TYPEID(Ret));
#else
						cast_failed_callback_fun e = get_cast_failed_callback();
						if (e) e(L, LUABIND_TYPEID(Ret));

						assert(0 && "the lua function's return value could not be converted."
									" If you want to handle the error you can use luabind::set_error_callback()");
						std::terminate();

#endif
					}
#endif
					return converter.apply(L, LUABIND_DECORATE_TYPE(Ret), -1);
				}

				template<class Policies>
				Ret operator[](const Policies& p)
				{
					typedef typename detail::find_conversion_policy<0, Policies>::type converter_policy;
					typename mpl::apply_wrap2<converter_policy,Ret,lua_to_cpp>::type converter;

					m_called = true;
					lua_State* L = m_state;

					int top = lua_gettop(L);

					detail::push_args_from_tuple<1>::apply(L, m_args, p);
					if (m_fun(L, boost::tuples::length<Tuple>::value, 1))
					{ 
						assert(lua_gettop(L) == top - m_params + 1);
#ifndef LUABIND_NO_EXCEPTIONS
						throw error(L);
#else
						error_callback_fun e = get_error_callback();
						if (e) e(L);
	
						assert(0 && "the lua function threw an error and exceptions are disabled."
								" If you want to handle the error you can use luabind::set_error_callback()");
						std::terminate();
#endif
					}

					// pops the return values from the function call
					stack_pop pop(L, lua_gettop(L) - top + m_params);

#ifndef LUABIND_NO_ERROR_CHECKING

					if (converter.match(L, LUABIND_DECORATE_TYPE(Ret), -1) < 0)
					{
#ifndef LUABIND_NO_EXCEPTIONS
						throw cast_failed(L, LUABIND_TYPEID(Ret));
#else
						cast_failed_callback_fun e = get_cast_failed_callback();
						if (e) e(L, LUABIND_TYPEID(Ret));

						assert(0 && "the lua function's return value could not be converted."
									" If you want to handle the error you can use luabind::set_error_callback()");
						std::terminate();

#endif
					}
#endif
					return converter.apply(L, LUABIND_DECORATE_TYPE(Ret), -1);
				}

			private:

				lua_State* m_state;
				int m_params;
				function_t m_fun;
				Tuple m_args;
				mutable bool m_called;

			};

		// if the proxy_member_caller returns void
			template<class Tuple>
			class proxy_function_void_caller