mirror of
https://github.com/ThePhD/sol2.git
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415 lines
16 KiB
C++
415 lines
16 KiB
C++
// The MIT License (MIT)
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// Copyright (c) 2013-2016 Rapptz, ThePhD and contributors
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// Permission is hereby granted, free of charge, to any person obtaining a copy of
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// this software and associated documentation files (the "Software"), to deal in
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// the Software without restriction, including without limitation the rights to
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// use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
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// the Software, and to permit persons to whom the Software is furnished to do so,
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// subject to the following conditions:
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// The above copyright notice and this permission notice shall be included in all
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// copies or substantial portions of the Software.
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
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// FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
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// COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
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// IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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// CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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#ifndef SOL_FUNCTION_HPP
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#define SOL_FUNCTION_HPP
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#include "reference.hpp"
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#include "tuple.hpp"
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#include "stack.hpp"
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#include "function_types.hpp"
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#include "usertype_traits.hpp"
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#include "resolve.hpp"
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#include "function_result.hpp"
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#include <cstdint>
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#include <functional>
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#include <memory>
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namespace sol {
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template <typename Sig, typename... Args>
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struct function_packer : std::tuple<Args...> { using std::tuple<Args...>::tuple; };
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template <typename Sig, typename... Args>
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function_packer<Sig, Args...> function_pack( Args&&... args ) {
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return function_packer<Sig, Args...>(std::forward<Args>(args)...);
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}
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class function : public reference {
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private:
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void luacall( std::ptrdiff_t argcount, std::ptrdiff_t resultcount ) const {
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lua_callk( lua_state( ), static_cast<int>( argcount ), static_cast<int>( resultcount ), 0, nullptr );
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}
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template<std::size_t... I, typename... Ret>
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auto invoke( types<Ret...>, std::index_sequence<I...>, std::ptrdiff_t n ) const {
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luacall( n, sizeof...( Ret ) );
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int stacksize = lua_gettop( lua_state( ) );
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int firstreturn = std::max(1, stacksize - static_cast<int>(sizeof...(Ret)) + 1);
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auto r = stack::get<std::tuple<Ret...>>( lua_state( ), firstreturn );
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lua_pop(lua_state(), static_cast<int>(sizeof...(Ret)));
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return r;
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}
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template<std::size_t I, typename Ret>
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Ret invoke(types<Ret>, std::index_sequence<I>, std::ptrdiff_t n ) const {
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luacall( n, 1 );
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return stack::pop<Ret>( lua_state( ) );
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}
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template <std::size_t I>
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void invoke(types<void>, std::index_sequence<I>, std::ptrdiff_t n) const {
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luacall( n, 0 );
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}
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function_result invoke(types<>, std::index_sequence<>, std::ptrdiff_t n ) const {
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int stacksize = lua_gettop( lua_state( ) );
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int firstreturn = std::max( 1, stacksize - static_cast<int>( n ) );
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luacall(n, LUA_MULTRET);
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int poststacksize = lua_gettop( lua_state( ) );
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int returncount = poststacksize - (firstreturn - 1);
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return function_result( lua_state( ), firstreturn, returncount );
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}
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public:
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using reference::reference;
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template<typename... Args>
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function_result operator()( Args&&... args ) const {
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return call<>( std::forward<Args>( args )... );
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}
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template<typename... Ret, typename... Args>
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decltype(auto) operator()( types<Ret...>, Args&&... args ) const {
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return call<Ret...>( std::forward<Args>( args )... );
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}
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template<typename... Ret, typename... Args>
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decltype(auto) call( Args&&... args ) const {
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push( );
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int pushcount = stack::push_args( lua_state( ), std::forward<Args>( args )... );
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return invoke( types<Ret...>( ), std::index_sequence_for<Ret...>(), pushcount );
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}
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};
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class protected_function : public reference {
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private:
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static reference& handler_storage() {
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static sol::reference h;
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return h;
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}
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public:
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static const reference& get_default_handler () {
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return handler_storage();
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}
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static void set_default_handler( reference& ref ) {
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handler_storage() = ref;
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}
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private:
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struct handler {
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const reference& target;
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int stackindex;
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handler(const reference& target) : target(target), stackindex(0) {
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if (target.valid()) {
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stackindex = lua_gettop(target.lua_state()) + 1;
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target.push();
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}
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}
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~handler() {
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if (stackindex > 0) {
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lua_remove(target.lua_state(), stackindex);
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}
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}
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};
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int luacall(std::ptrdiff_t argcount, std::ptrdiff_t resultcount, handler& h) const {
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return lua_pcallk(lua_state(), static_cast<int>(argcount), static_cast<int>(resultcount), h.stackindex, 0, nullptr);
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}
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template<std::size_t... I, typename... Ret>
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auto invoke(types<Ret...>, std::index_sequence<I...>, std::ptrdiff_t n, handler& h) const {
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luacall(n, sizeof...(Ret), h);
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int stacksize = lua_gettop(lua_state());
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int firstreturn = std::max(0, stacksize - static_cast<int>(sizeof...(Ret)) + 1);
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auto r = stack::get<std::tuple<Ret...>>(lua_state(), firstreturn);
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lua_pop(lua_state(), static_cast<int>(sizeof...(Ret)));
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return r;
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}
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template<std::size_t I, typename Ret>
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Ret invoke(types<Ret>, std::index_sequence<I>, std::ptrdiff_t n, handler& h) const {
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luacall(n, 1, h);
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return stack::pop<Ret>(lua_state());
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}
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template <std::size_t I>
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void invoke(types<void>, std::index_sequence<I>, std::ptrdiff_t n, handler& h) const {
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luacall(n, 0, h);
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}
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protected_function_result invoke(types<>, std::index_sequence<>, std::ptrdiff_t n, handler& h) const {
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bool handlerpushed = error_handler.valid();
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int stacksize = lua_gettop(lua_state());
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int firstreturn = std::max(1, stacksize - static_cast<int>(n) - 1);
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int returncount = 0;
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call_status code = call_status::ok;
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try {
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code = static_cast<call_status>(luacall(n, LUA_MULTRET, h));
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int poststacksize = lua_gettop(lua_state());
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returncount = poststacksize - firstreturn;
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}
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// Handle C++ errors thrown from C++ functions bound inside of lua
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catch (const std::exception& error) {
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h.stackindex = 0;
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stack::push(lua_state(), error.what());
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firstreturn = lua_gettop(lua_state());
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return protected_function_result(lua_state(), firstreturn, 0, 1, call_status::runtime);
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}
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catch (...) {
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throw;
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}
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return protected_function_result(lua_state(), firstreturn + ( handlerpushed ? 0 : 1 ), returncount, returncount, code);
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}
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public:
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sol::reference error_handler;
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protected_function() = default;
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protected_function(lua_State* L, int index = -1): reference(L, index), error_handler(get_default_handler()) {
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type_assert(L, index, type::function);
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}
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protected_function(const protected_function&) = default;
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protected_function& operator=(const protected_function&) = default;
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protected_function( protected_function&& ) = default;
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protected_function& operator=( protected_function&& ) = default;
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template<typename... Args>
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protected_function_result operator()(Args&&... args) const {
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return call<>(std::forward<Args>(args)...);
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}
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template<typename... Ret, typename... Args>
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decltype(auto) operator()(types<Ret...>, Args&&... args) const {
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return call<Ret...>(std::forward<Args>(args)...);
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}
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template<typename... Ret, typename... Args>
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decltype(auto) call(Args&&... args) const {
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handler h(error_handler);
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push();
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int pushcount = stack::push_args(lua_state(), std::forward<Args>(args)...);
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return invoke(types<Ret...>(), std::index_sequence_for<Ret...>(), pushcount, h);
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}
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};
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namespace stack {
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template<typename... Sigs>
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struct pusher<function_sig<Sigs...>> {
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template<typename R, typename... Args, typename Fx, typename = std::result_of_t<Fx(Args...)>>
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static void set_memfx(types<R(Args...)> t, lua_State* L, Fx&& fx) {
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typedef std::decay_t<meta::Unwrapped<meta::Unqualified<Fx>>> raw_fx_t;
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typedef R(* fx_ptr_t)(Args...);
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typedef std::is_convertible<raw_fx_t, fx_ptr_t> is_convertible;
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set_isconvertible_fx(is_convertible(), t, L, std::forward<Fx>(fx));
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}
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template<typename Fx>
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static void set_memfx(types<>, lua_State* L, Fx&& fx) {
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typedef meta::Unwrapped<meta::Unqualified<Fx>> fx_t;
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set(L, &fx_t::operator(), std::forward<Fx>(fx));
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}
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template<typename... Args, typename R>
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static void set(lua_State* L, R fxptr(Args...)){
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set_fx(std::false_type(), L, fxptr);
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}
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template<typename Sig>
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static void set(lua_State* L, Sig* fxptr){
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set_fx(std::false_type(), L, fxptr);
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}
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template<typename... Args, typename R, typename C, typename T>
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static void set(lua_State* L, R (C::*memfxptr)(Args...), T&& obj) {
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typedef meta::Bool<meta::is_specialization_of<meta::Unqualified<T>, std::reference_wrapper>::value || std::is_pointer<T>::value> is_reference;
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set_reference_fx(is_reference(), L, memfxptr, std::forward<T>(obj));
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}
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template<typename Sig, typename C, typename T>
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static void set(lua_State* L, Sig C::* memfxptr, T&& obj) {
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typedef meta::Bool<meta::is_specialization_of<meta::Unqualified<T>, std::reference_wrapper>::value || std::is_pointer<T>::value> is_reference;
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set_reference_fx(is_reference(), L, memfxptr, std::forward<T>(obj));
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}
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template<typename... Sig, typename Fx>
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static void set(lua_State* L, Fx&& fx) {
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set_memfx(types<Sig...>(), L, std::forward<Fx>(fx));
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}
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template<typename Fx, typename R, typename... Args>
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static void set_isconvertible_fx(std::true_type, types<R(Args...)>, lua_State* L, Fx&& fx) {
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typedef R(* fx_ptr_t)(Args...);
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fx_ptr_t fxptr = detail::unwrap(std::forward<Fx>(fx));
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set(L, fxptr);
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}
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template<typename Fx, typename R, typename... Args>
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static void set_isconvertible_fx(std::false_type, types<R(Args...)>, lua_State* L, Fx&& fx) {
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typedef meta::Unwrapped<std::decay_t<Fx>> fx_t;
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std::unique_ptr<function_detail::base_function> sptr = std::make_unique<function_detail::functor_function<fx_t>>(std::forward<Fx>(fx));
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set_fx<Fx>(L, std::move(sptr));
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}
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template<typename Fx, typename T>
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static void set_reference_fx(std::true_type, lua_State* L, Fx&& fx, T&& obj) {
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set_fx(std::true_type(), L, std::forward<Fx>(fx), std::forward<T>(obj));
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}
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template<typename Fx, typename T>
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static void set_reference_fx(std::false_type, lua_State* L, Fx&& fx, T&& obj) {
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typedef std::remove_pointer_t<std::decay_t<Fx>> clean_fx;
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std::unique_ptr<function_detail::base_function> sptr = std::make_unique<function_detail::member_function<clean_fx, meta::Unqualified<T>>>(std::forward<T>(obj), std::forward<Fx>(fx));
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return set_fx<Fx>(L, std::move(sptr));
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}
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template<typename Fx, typename T>
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static void set_fx(std::true_type, lua_State* L, Fx&& fx, T&& obj) {
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// Layout:
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// idx 1...n: verbatim data of member function pointer
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// idx n + 1: is the object's void pointer
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// We don't need to store the size, because the other side is templated
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// with the same member function pointer type
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typedef std::decay_t<Fx> dFx;
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typedef meta::Unqualified<Fx> uFx;
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dFx memfxptr(std::forward<Fx>(fx));
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auto userptr = detail::ptr(obj);
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void* userobjdata = static_cast<void*>(userptr);
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lua_CFunction freefunc = &function_detail::static_member_function<std::decay_t<decltype(*userptr)>, uFx>::call;
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int upvalues = stack::stack_detail::push_as_upvalues(L, memfxptr);
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upvalues += stack::push(L, userobjdata);
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stack::push(L, freefunc, upvalues);
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}
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template<typename Fx>
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static void set_fx(std::false_type, lua_State* L, Fx&& fx) {
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std::decay_t<Fx> target(std::forward<Fx>(fx));
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lua_CFunction freefunc = &function_detail::static_function<Fx>::call;
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int upvalues = stack::stack_detail::push_as_upvalues(L, target);
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stack::push(L, freefunc, upvalues);
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}
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template<typename Fx>
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static void set_fx(lua_State* L, std::unique_ptr<function_detail::base_function> luafunc) {
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const static auto& metakey = u8"sol.ƒ.♲.🗑.(/¯◡ ‿ ◡)/¯ ~ ┻━┻ (ﾉ◕ヮ◕)ﾉ*:･ﾟ✧";
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const static char* metatablename = &metakey[0];
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function_detail::base_function* target = luafunc.release();
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void* userdata = reinterpret_cast<void*>(target);
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lua_CFunction freefunc = function_detail::call;
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int metapushed = luaL_newmetatable(L, metatablename);
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if(metapushed == 1) {
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lua_pushstring(L, "__gc");
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stack::push(L, function_detail::gc);
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lua_settable(L, -3);
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lua_pop(L, 1);
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}
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stack::stack_detail::push_userdata<void*>(L, metatablename, userdata);
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stack::push(L, freefunc, 1);
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}
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template<typename... Args>
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static int push(lua_State* L, Args&&... args) {
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// Set will always place one thing (function) on the stack
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set(L, std::forward<Args>(args)...);
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return 1;
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}
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};
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template<typename T, typename... Args>
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struct pusher<function_packer<T, Args...>> {
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template <std::size_t... I, typename FP>
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static int push_func(std::index_sequence<I...>, lua_State* L, FP&& fp) {
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return stack::push<T>(L, std::get<I>(fp)...);
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}
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template <typename FP>
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static int push(lua_State* L, FP&& fp) {
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return push_func(std::index_sequence_for<Args...>(), L, std::forward<FP>(fp));
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}
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};
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template<typename Signature>
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struct pusher<std::function<Signature>> {
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static int push(lua_State* L, std::function<Signature> fx) {
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return pusher<function_sig<>>{}.push(L, std::move(fx));
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}
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};
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template<typename... Functions>
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struct pusher<overload_set<Functions...>> {
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template<std::size_t... I, typename Set>
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static int push(std::index_sequence<I...>, lua_State* L, Set&& set) {
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pusher<function_sig<>>{}.set_fx<Set>(L, std::make_unique<function_detail::overloaded_function<Functions...>>(std::get<I>(set)...));
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return 1;
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}
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template<typename Set>
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static int push(lua_State* L, Set&& set) {
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return push(std::index_sequence_for<Functions...>(), L, std::forward<Set>(set));
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}
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};
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template<typename Signature>
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struct getter<std::function<Signature>> {
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typedef meta::function_traits<Signature> fx_t;
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typedef typename fx_t::args_type args_types;
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typedef meta::tuple_types<typename fx_t::return_type> return_types;
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template<typename... Args, typename... Ret>
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static std::function<Signature> get_std_func(types<Ret...>, types<Args...>, lua_State* L, int index = -1) {
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sol::function f(L, index);
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auto fx = [f, L, index](Args&&... args) -> meta::return_type_t<Ret...> {
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return f.call<Ret...>(std::forward<Args>(args)...);
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};
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return std::move(fx);
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}
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template<typename... FxArgs>
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static std::function<Signature> get_std_func(types<void>, types<FxArgs...>, lua_State* L, int index = -1) {
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sol::function f(L, index);
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auto fx = [f, L, index](FxArgs&&... args) -> void {
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f(std::forward<FxArgs>(args)...);
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};
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return std::move(fx);
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}
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template<typename... FxArgs>
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static std::function<Signature> get_std_func(types<>, types<FxArgs...> t, lua_State* L, int index = -1) {
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return get_std_func(types<void>(), t, L, index);
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}
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static std::function<Signature> get(lua_State* L, int index) {
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return get_std_func(return_types(), args_types(), L, index);
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}
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};
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} // stack
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} // sol
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#endif // SOL_FUNCTION_HPP
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