mirror of
https://github.com/ThePhD/sol2.git
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268 lines
9.8 KiB
C++
268 lines
9.8 KiB
C++
// The MIT License (MIT)
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// Copyright (c) 2013 Danny Y., Rapptz
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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_LUA_FUNC_HPP
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#define SOL_LUA_FUNC_HPP
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#include "functional.hpp"
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#include "stack.hpp"
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#include <memory>
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namespace sol {
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namespace detail {
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template<typename T, std::size_t N>
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void get_upvalue_ptr(lua_State* L, T*& data, std::size_t datasize, std::array<void*, N> voiddata, int& upvalue) {
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for (std::size_t i = 0, d = 0; d < datasize; ++i, d += sizeof(void*)) {
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voiddata[i] = lua_touserdata(L, lua_upvalueindex(upvalue++));
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}
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data = reinterpret_cast<T*>(static_cast<void*>(voiddata.data()));
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}
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template<typename T, std::size_t N>
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void get_upvalue_ptr(lua_State* L, T*& data, std::array<void*, N> voiddata, int& upvalue) {
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get_upvalue_ptr(L, data, sizeof(T), voiddata, upvalue);
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}
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template<typename T>
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void get_upvalue_ptr(lua_State* L, T*& data, int& upvalue) {
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const static std::size_t data_t_count = (sizeof(T)+(sizeof(void*)-1)) / sizeof(void*);
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typedef std::array<void*, data_t_count> data_t;
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data_t voiddata{{}};
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return get_upvalue_ptr(L, data, voiddata, upvalue);
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}
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template<typename T>
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void get_upvalue(lua_State* L, T& data, int& upvalue) {
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const static std::size_t data_t_count = (sizeof(T)+(sizeof(void*)-1)) / sizeof(void*);
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typedef std::array<void*, data_t_count> data_t;
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data_t voiddata{{}};
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for (std::size_t i = 0, d = 0; d < sizeof(T); ++i, d += sizeof(void*)) {
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voiddata[i] = lua_touserdata(L, lua_upvalueindex(upvalue++));
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}
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data = *reinterpret_cast<T*>(static_cast<void*>(voiddata.data()));
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}
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} // detail
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template<typename TFx>
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struct static_lua_func {
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typedef typename std::remove_pointer<typename std::decay<TFx>::type>::type fx_t;
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typedef detail::function_traits<fx_t> fx_traits;
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template<typename... Args>
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static int typed_call(types<void>, types<Args...> t, fx_t* fx, lua_State* L) {
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stack::pop_call(L, fx, t);
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return 0;
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}
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template<typename... TRn, typename... Args>
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static int typed_call(types<TRn...>, types<Args...> t, fx_t* fx, lua_State* L) {
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auto r = stack::pop_call(L, fx, t);
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stack::push(L, std::move(r));
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return sizeof...(TRn);
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}
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static int call(lua_State* L) {
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int upvalue = 1;
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fx_t* fx;
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detail::get_upvalue(L, fx, upvalue);
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int r = typed_call(tuple_types<typename fx_traits::return_type>(), typename fx_traits::args_type(), fx, L);
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return r;
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}
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int operator()(lua_State* L) {
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return call(L);
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}
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};
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template<typename T, typename TFx>
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struct static_object_lua_func {
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typedef typename std::decay<TFx>::type fx_t;
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typedef detail::function_traits<fx_t> fx_traits;
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template<typename... Args>
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static int typed_call(types<void>, types<Args...>, T& item, fx_t& ifx, lua_State* L) {
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auto fx = [&item, &ifx](Args&&... args) { (item.*ifx)(std::forward<Args>(args)...); };
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stack::pop_call(L, fx, types<Args...>());
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return 0;
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}
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template<typename TR, typename... Args>
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static int typed_call(types<TR>, types<Args...>, T& item, fx_t& ifx, lua_State* L) {
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auto fx = [&item, &ifx](Args&&... args) -> TR {
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return (item.*ifx)(std::forward<Args>(args)...);
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};
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auto r = stack::pop_call(L, fx, types<Args...>());
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stack::push(L, std::move(r));
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return 1;
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}
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template<typename... TRn, typename... Args>
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static int typed_call(types<TRn...>, types<Args...>, T& item, fx_t& ifx, lua_State* L) {
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auto fx = [&item, &ifx](Args&&... args) -> std::tuple<TRn...> { return (item.*ifx)(std::forward<Args>(args)...); };
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auto r = stack::pop_call(L, fx, types<Args...>());
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stack::push(L, std::move(r));
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return sizeof...(TRn);
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}
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static int call(lua_State* L) {
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const static std::size_t data_t_count = (sizeof(fx_t)+(sizeof(void*)-1)) / sizeof(void*);
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typedef std::array<void*, data_t_count> data_t;
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int upvalue = 1;
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data_t data = {{}};
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fx_t* fxptr;
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for (std::size_t i = 0, d = 0; d < sizeof(fx_t*); ++i, d += sizeof(void*)) {
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data[i] = lua_touserdata(L, lua_upvalueindex(upvalue++));
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}
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fxptr = reinterpret_cast<fx_t*>(static_cast<void*>(data.data()));
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fx_t& mem_ptr = *fxptr;
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void* objectdata = lua_touserdata(L, lua_upvalueindex(upvalue++));
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T& obj = *static_cast<T*>(objectdata);
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int r = typed_call(tuple_types<typename fx_traits::return_type>(), typename fx_traits::args_type(), obj, mem_ptr, L);
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return r;
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}
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int operator()(lua_State* L) {
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return call(L);
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}
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};
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struct lua_func {
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static int call(lua_State* L) {
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void** pinheritancedata = static_cast<void**>(lua_touserdata(L, lua_upvalueindex(1)));
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void* inheritancedata = *pinheritancedata;
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if (inheritancedata == nullptr)
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throw sol_error("call from Lua to C++ function has null data");
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lua_func* pfx = static_cast<lua_func*>(inheritancedata);
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lua_func& fx = *pfx;
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int r = fx(L);
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return r;
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}
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static int gc(lua_State* L) {
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void** puserdata = static_cast<void**>(lua_touserdata(L, 1));
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void* userdata = *puserdata;
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lua_func* ptr = static_cast<lua_func*>(userdata);
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std::default_delete<lua_func> dx{};
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dx(ptr);
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return 0;
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}
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virtual int operator()(lua_State*) {
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throw sol_error("failure to call specialized wrapped C++ function from Lua");
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}
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virtual ~lua_func() {}
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};
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template<typename TFx>
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struct lambda_lua_func : public lua_func {
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typedef decltype(&TFx::operator()) fx_t;
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typedef detail::function_traits<fx_t> fx_traits;
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TFx fx;
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template<typename... FxArgs>
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lambda_lua_func(FxArgs&&... fxargs): fx(std::forward<FxArgs>(fxargs)...) {}
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virtual int operator()(lua_State* L) override {
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return (*this)(tuple_types<typename fx_traits::return_type>(), typename fx_traits::args_type(), L);
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}
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template<typename... Args>
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int operator()(types<void>, types<Args...> t, lua_State* L) {
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stack::pop_call(L, fx, t);
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return 0;
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}
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template<typename... TRn, typename... Args>
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int operator()(types<TRn...>, types<Args...> t, lua_State* L) {
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auto r = stack::pop_call(L, fx, t);
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stack::push(L, r);
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return sizeof...(TRn);
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}
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};
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template<typename TFx, typename T = TFx, bool is_member_pointer = std::is_member_function_pointer<TFx>::value>
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struct explicit_lua_func : public lua_func {
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typedef typename std::remove_pointer<typename std::decay<TFx>::type>::type fx_t;
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typedef detail::function_traits<fx_t> fx_traits;
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TFx fx;
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template<typename... FxArgs>
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explicit_lua_func(FxArgs&&... fxargs): fx(std::forward<FxArgs>(fxargs)...) {}
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virtual int operator()(lua_State* L) override {
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return (*this)(tuple_types<typename fx_traits::return_type>(), typename fx_traits::args_type(), L);
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}
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template<typename... Args>
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int operator()(types<void>, types<Args...> t, lua_State* L) {
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stack::pop_call(L, fx, t);
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return 0;
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}
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template<typename... TRn, typename... Args>
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int operator()(types<TRn...>, types<Args...> t, lua_State* L) {
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auto r = stack::pop_call(L, fx, t);
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stack::push(L, std::move(r));
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return sizeof...(TRn);
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}
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};
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template<typename TFx, typename T>
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struct explicit_lua_func<TFx, T, true> : public lua_func {
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typedef typename std::remove_pointer<typename std::decay<TFx>::type>::type fx_t;
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typedef detail::function_traits<fx_t> fx_traits;
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struct lambda {
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T member;
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TFx invocation;
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template<typename... FxArgs>
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lambda(T m, FxArgs&&... fxargs): member(std::move(m)), invocation(std::forward<FxArgs>(fxargs)...) {}
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template<typename... Args>
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typename fx_traits::return_type operator()(Args&&... args) {
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return (member.*invocation)(std::forward<Args>(args)...);
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}
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} fx;
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template<typename... FxArgs>
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explicit_lua_func(T m, FxArgs&&... fxargs): fx(std::move(m), std::forward<FxArgs>(fxargs)...) {}
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virtual int operator()(lua_State* L) override {
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return (*this)(tuple_types<typename fx_traits::return_type>(), typename fx_traits::args_type(), L);
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}
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template<typename... Args>
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int operator()(types<void>, types<Args...> t, lua_State* L) {
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stack::pop_call(L, fx, t);
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return 0;
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}
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template<typename... TRn, typename... Args>
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int operator()(types<TRn...>, types<Args...> t, lua_State* L) {
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auto r = stack::pop_call(L, fx, t);
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stack::push(L, r);
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return sizeof...(TRn);
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}
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};
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} // sol
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#endif // SOL_LUA_FUNC_HPP
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