mirror of
https://github.com/ThePhD/sol2.git
synced 2024-03-22 13:10:44 +08:00
37c3883eb6
now are usable as functions for userdata. allows free functions and lambdas to provide useful operations, like operator+*-/ and other things which may not be implemented as class members.
495 lines
16 KiB
C++
495 lines
16 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_STACK_HPP
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#define SOL_STACK_HPP
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#include "error.hpp"
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#include "reference.hpp"
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#include "tuple.hpp"
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#include "traits.hpp"
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#include "userdata_traits.hpp"
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#include <utility>
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#include <array>
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#include <cstring>
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#include <functional>
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namespace sol {
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namespace detail {
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template<typename T>
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inline T* get_ptr(T& val) {
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return std::addressof(val);
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}
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template<typename T>
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inline T* get_ptr(std::reference_wrapper<T> val) {
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return std::addressof(val.get());
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}
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template<typename T>
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inline T* get_ptr(T* val) {
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return val;
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}
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template<typename Decorated>
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struct return_forward {
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typedef Unqualified<Decorated> T;
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T& operator()(T& value) const {
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return value;
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}
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T&& operator()(T&& value) const {
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return std::move(value);
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}
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T operator()(const T& value) const {
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return value;
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}
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// handle retarded libraries
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T operator()(const T&& value) const {
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return value;
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}
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};
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} // detail
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namespace stack {
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namespace detail {
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template<typename T, typename Key, typename... Args>
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inline void push_userdata(lua_State* L, Key&& metatablekey, Args&&... args) {
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T* pdatum = static_cast<T*>(lua_newuserdata(L, sizeof(T)));
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std::allocator<T> alloc{};
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alloc.construct(pdatum, std::forward<Args>(args)...);
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luaL_getmetatable(L, std::addressof(metatablekey[0]));
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lua_setmetatable(L, -2);
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}
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} // detail
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template<typename T, typename X = void>
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struct getter;
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template<typename T, typename X = void>
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struct pusher;
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template<typename T, typename>
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struct getter {
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template<typename U = T, EnableIf<std::is_floating_point<U>> = 0>
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static U get(lua_State* L, int index = -1) {
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return lua_tonumber(L, index);
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}
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template<typename U = T, EnableIf<std::is_integral<U>, std::is_signed<U>> = 0>
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static U get(lua_State* L, int index = -1) {
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return lua_tounsigned(L, index);
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}
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template<typename U = T, EnableIf<std::is_integral<U>, std::is_unsigned<U>> = 0>
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static U get(lua_State* L, int index = -1) {
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return static_cast<T>(lua_tointeger(L, index));
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}
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template<typename U = T, EnableIf<std::is_base_of<reference, U>> = 0>
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static U get(lua_State* L, int index = -1) {
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return T(L, index);
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}
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template<typename U = T, EnableIf<Not<std::is_base_of<reference, U>>, Not<std::is_integral<U>>, Not<std::is_floating_point<U>>> = 0>
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static U& get(lua_State* L, int index = -1) {
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void* udata = lua_touserdata(L, index);
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T* obj = static_cast<T*>(udata);
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return *obj;
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}
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};
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template<typename T>
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struct getter<T*> {
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static T* get(lua_State* L, int index = -1) {
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void* udata = lua_touserdata(L, index);
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T** obj = static_cast<T**>(udata);
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return *obj;
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}
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};
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template<>
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struct getter<type> {
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static type get(lua_State *L, int index){
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return static_cast<type>(lua_type(L, index));
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}
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};
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template<>
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struct getter<bool> {
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static bool get(lua_State* L, int index) {
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return lua_toboolean(L, index) != 0;
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}
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};
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template<>
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struct getter<std::string> {
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static std::string get(lua_State* L, int index = -1) {
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std::string::size_type len;
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auto str = lua_tolstring(L, index, &len);
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return{ str, len };
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}
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};
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template<>
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struct getter<const char*> {
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static const char* get(lua_State* L, int index = -1) {
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return lua_tostring(L, index);
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}
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};
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template<>
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struct getter<nil_t> {
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static nil_t get(lua_State* L, int index = -1) {
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if (lua_isnil(L, index) == 0)
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throw sol::error("not nil");
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return nil_t{ };
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}
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};
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template<>
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struct getter<userdata_t> {
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static userdata_t get(lua_State* L, int index = -1) {
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return{ lua_touserdata(L, index) };
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}
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};
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template<>
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struct getter<lightuserdata_t> {
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static lightuserdata_t get(lua_State* L, int index = 1) {
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return{ lua_touserdata(L, index) };
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}
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};
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template<>
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struct getter<upvalue_t> {
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static upvalue_t get(lua_State* L, int index = 1) {
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return{ lua_touserdata(L, lua_upvalueindex(index)) };
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}
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};
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template<>
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struct getter<void*> {
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static void* get(lua_State* L, int index = 1) {
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return lua_touserdata(L, index);
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}
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};
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template<typename T, typename>
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struct pusher {
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template<typename U = T, EnableIf<std::is_floating_point<U>> = 0>
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static void push(lua_State* L, const T& value) {
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lua_pushnumber(L, value);
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}
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template<typename U = T, EnableIf<std::is_integral<U>, std::is_signed<U>> = 0>
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static void push(lua_State* L, const T& value) {
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lua_pushinteger(L, value);
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}
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template<typename U = T, EnableIf<std::is_integral<U>, std::is_unsigned<U>> = 0>
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static void push(lua_State* L, const T& value) {
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lua_pushunsigned(L, value);
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}
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template<typename U = T, EnableIf<has_begin_end<U>, Not<has_key_value_pair<U>>> = 0>
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static void push(lua_State* L, const T& cont) {
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lua_createtable(L, cont.size(), 0);
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unsigned index = 1;
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for(auto&& i : cont) {
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// push the index
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pusher<unsigned>{}.push(L, index++);
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// push the value
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pusher<Unqualified<decltype(i)>>{}.push(L, i);
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// set the table
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lua_settable(L, -3);
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}
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}
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template<typename U = T, EnableIf<has_begin_end<U>, has_key_value_pair<U>> = 0>
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static void push(lua_State* L, const T& cont) {
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lua_createtable(L, cont.size(), 0);
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for(auto&& pair : cont) {
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pusher<Unqualified<decltype(pair.first)>>{}.push(L, pair.first);
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pusher<Unqualified<decltype(pair.second)>>{}.push(L, pair.second);
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lua_settable(L, -3);
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}
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}
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template<typename U = T, EnableIf<std::is_base_of<reference, U>> = 0>
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static void push(lua_State*, T& ref) {
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ref.push();
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}
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template<typename U = Unqualified<T>, EnableIf<Not<has_begin_end<U>>, Not<std::is_base_of<reference, U>>, Not<std::is_integral<U>>, Not<std::is_floating_point<U>>> = 0>
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static void push(lua_State* L, T& t) {
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pusher<T*>{}.push(L, std::addressof(t));
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}
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template<typename U = Unqualified<T>, EnableIf<Not<has_begin_end<U>>, Not<std::is_base_of<reference, U>>, Not<std::is_integral<U>>, Not<std::is_floating_point<U>>> = 0>
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static void push(lua_State* L, T&& t) {
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detail::push_userdata<U>(L, userdata_traits<T>::metatable, std::move(t));
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}
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};
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template<typename T>
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struct pusher<T*> {
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static void push(lua_State* L, T* obj) {
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detail::push_userdata<T*>(L, userdata_traits<T*>::metatable, obj);
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}
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};
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template<>
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struct pusher<bool> {
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static void push(lua_State* L, const bool& b) {
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lua_pushboolean(L, b);
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}
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};
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template<>
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struct pusher<nil_t> {
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static void push(lua_State* L, const nil_t&) {
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lua_pushnil(L);
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}
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};
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template<>
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struct pusher<lua_CFunction> {
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static void push(lua_State* L, lua_CFunction func, int n = 0) {
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lua_pushcclosure(L, func, n);
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}
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};
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template<>
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struct pusher<void*> {
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static void push(lua_State* L, void* userdata) {
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lua_pushlightuserdata(L, userdata);
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}
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};
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template<>
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struct pusher<upvalue_t> {
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static void push(lua_State* L, upvalue_t upvalue) {
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lua_pushlightuserdata(L, upvalue);
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}
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};
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template<>
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struct pusher<lightuserdata_t> {
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static void push(lua_State* L, lightuserdata_t userdata) {
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lua_pushlightuserdata(L, userdata);
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}
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};
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template<>
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struct pusher<userdata_t> {
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template<typename T, typename U = Unqualified<T>>
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static void push(lua_State* L, T&& data) {
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U* userdata = static_cast<U*>(lua_newuserdata(L, sizeof(U)));
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new(userdata)U(std::forward<T>(data));
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}
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};
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template<>
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struct pusher<const char*> {
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static void push(lua_State* L, const char* str) {
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lua_pushlstring(L, str, std::char_traits<char>::length(str));
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}
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};
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template<size_t N>
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struct pusher<char[N]> {
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static void push(lua_State* L, const char (&str)[N]) {
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lua_pushlstring(L, str, N - 1);
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}
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};
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template<>
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struct pusher<std::string> {
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static void push(lua_State* L, const std::string& str) {
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lua_pushlstring(L, str.c_str(), str.size());
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}
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};
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template<typename T, typename... Args>
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inline void push(lua_State* L, T&& t, Args&&... args) {
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pusher<Unqualified<T>>{}.push(L, std::forward<T>(t), std::forward<Args>(args)...);
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}
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// overload allows to use a pusher of a specific type, but pass in any kind of args
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template<typename T, typename Arg, typename... Args>
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inline void push(lua_State* L, Arg&& arg, Args&&... args) {
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pusher<Unqualified<T>>{}.push(L, std::forward<Arg>(arg), std::forward<Args>(args)...);
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}
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inline void push_args(lua_State*) {
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// do nothing
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}
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template<typename T, typename... Args>
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inline void push_args(lua_State* L, T&& t, Args&&... args) {
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pusher<Unqualified<T>>{}.push(L, std::forward<T>(t));
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using swallow = char[];
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void(swallow{'\0', (pusher<Unqualified<Args>>{}.push(L, std::forward<Args>(args)), '\0')... });
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}
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template<typename T, typename U = Unqualified<T>>
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inline auto get(lua_State* L, int index = -1) -> decltype(getter<U>{}.get(L, index)) {
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return getter<U>{}.get(L, index);
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}
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template<typename T>
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auto pop(lua_State* L) -> decltype(get<T>(L)) {
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typedef decltype(get<T>(L)) ret_t;
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ret_t r = get<T>(L);
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lua_pop(L, 1);
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return r;
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}
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namespace detail {
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template<typename T>
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inline int push_as_upvalues(lua_State* L, T& item) {
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typedef typename std::decay<T>::type TValue;
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const static std::size_t itemsize = sizeof(TValue);
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const static std::size_t voidsize = sizeof(void*);
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const static std::size_t voidsizem1 = voidsize - 1;
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const static std::size_t data_t_count = (sizeof(TValue) + voidsizem1) / voidsize;
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typedef std::array<void*, data_t_count> data_t;
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data_t data{{}};
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std::memcpy(std::addressof(data[0]), std::addressof(item), itemsize);
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for (auto&& v : data) {
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push(L, upvalue_t(v));
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}
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return data_t_count;
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}
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template<typename T>
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inline std::pair<T, int> get_as_upvalues(lua_State* L, int index = 1) {
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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] = get<upvalue_t>(L, index++);
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}
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return std::pair<T, int>(*reinterpret_cast<T*>(static_cast<void*>(voiddata.data())), index);
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}
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template<typename T, std::size_t... I>
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inline void push_tuple(lua_State* L, indices<I...>, T&& tuplen) {
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using swallow = char[1 + sizeof...(I)];
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swallow {'\0', (sol::stack::push(L, std::get<I>(tuplen)), '\0')... };
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}
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template<typename F, typename... Vs, typename... Args>
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inline auto ltr_get(lua_State*, int, F&& f, types<Args...>, types<>, Vs&&... vs) -> decltype(f(std::forward<Vs>(vs)...)) {
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return f(std::forward<Vs>(vs)...);
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}
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template<typename F, typename Head, typename... Tail, typename... Vs, typename... Args>
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inline auto ltr_get(lua_State* L, int index, F&& f, types<Args...>, types<Head, Tail...>, Vs&&... vs) -> decltype(f(std::declval<Args>()...)) {
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return ltr_get(L, index + 1, std::forward<F>(f), types<Args...>(), types<Tail...>(), std::forward<Vs>(vs)..., stack::get<Head>(L, index));
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}
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template<typename F, typename... Vs, typename... Args>
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inline auto ltr_pop(lua_State*, F&& f, types<Args...>, types<>, Vs&&... vs) -> decltype(f(std::forward<Vs>(vs)...)) {
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return f(std::forward<Vs>(vs)...);
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}
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template<typename F, typename Head, typename... Tail, typename... Vs, typename... Args>
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inline auto ltr_pop(lua_State* L, F&& f, types<Args...> t, types<Head, Tail...>, Vs&&... vs) -> decltype(f(std::declval<Args>()...)) {
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return ltr_pop(L, std::forward<F>(f), t, types<Tail...>(), std::forward<Vs>(vs)..., stack::pop<Head>(L));
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}
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template<typename F, typename... Vs, typename... Args>
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inline auto rtl_pop(lua_State*, F&& f, types<Args...>, types<>, Vs&&... vs) -> decltype(f(std::forward<Vs>(vs)...)) {
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return f(std::forward<Vs>(vs)...);
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}
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template<typename F, typename Head, typename... Tail, typename... Vs, typename... Args>
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inline auto rtl_pop(lua_State* L, F&& f, types<Args...> t, types<Head, Tail...>, Vs&&... vs) -> decltype(f(std::declval<Args>()...)) {
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return rtl_pop(L, std::forward<F>(f), t, types<Tail...>(), stack::pop<Head>(L), std::forward<Vs>(vs)...);
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}
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} // detail
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template<typename... Args>
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struct pusher<std::tuple<Args...>> {
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static void push(lua_State* L, const std::tuple<Args...>& tuplen) {
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detail::push_tuple(L, build_indices<sizeof...(Args)>(), tuplen);
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}
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static void push(lua_State* L, std::tuple<Args...>&& tuplen) {
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detail::push_tuple(L, build_indices<sizeof...(Args)>(), std::move(tuplen));
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}
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};
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template<typename T>
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inline void push_reverse(lua_State* L, T&& item) {
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push(L, std::forward<T>(item));
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}
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template<typename... Args>
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inline void push_reverse(lua_State* L, const std::tuple<Args...>& tuplen) {
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detail::push_tuple(L, build_reverse_indices<sizeof...(Args)>(), tuplen);
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}
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template<typename... Args>
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inline void push_reverse(lua_State* L, std::tuple<Args...>&& tuplen) {
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detail::push_tuple(L, build_reverse_indices<sizeof...(Args)>(), std::move(tuplen));
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}
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template<typename... Args, typename TFx, typename... Vs>
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inline auto get_call(lua_State* L, int index, TFx&& fx, types<Args...> t, Vs&&... vs) -> decltype(detail::ltr_get(L, index, std::forward<TFx>(fx), t, t, std::forward<Vs>(vs)...)) {
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return detail::ltr_get(L, index, std::forward<TFx>(fx), t, t, std::forward<Vs>(vs)...);
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}
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template<typename TFx, typename... Args, typename... Vs>
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inline auto get_call(lua_State* L, TFx&& fx, types<Args...> t, Vs&&... vs) -> decltype(get_call(L, 1, std::forward<TFx>(fx), t, std::forward<Vs>(vs)...)) {
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return get_call(L, 1, std::forward<TFx>(fx), t, std::forward<Vs>(vs)...);
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}
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template<typename... Args, typename TFx>
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inline auto pop_call(lua_State* L, TFx&& fx, types<Args...> t) -> decltype(detail::ltr_pop(L, std::forward<TFx>(fx), t, t)) {
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return detail::ltr_pop(L, std::forward<TFx>(fx), t, t);
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}
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template<typename... Args, typename TFx>
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inline auto pop_reverse_call(lua_State* L, TFx&& fx, types<Args...> t) -> decltype(detail::rtl_pop(L, std::forward<TFx>(fx), t, reversed<Args...>())) {
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return detail::rtl_pop(L, std::forward<TFx>(fx), t, reversed<Args...>());
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}
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|
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inline call_syntax get_call_syntax(lua_State* L, const std::string& meta) {
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if (get<type>(L, 1) == type::table) {
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if (luaL_newmetatable(L, meta.c_str()) == 0) {
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lua_settop(L, -2);
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return call_syntax::colon;
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|
}
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}
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return call_syntax::dot;
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|
}
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template<typename T>
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struct get_return {
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typedef decltype(get<T>(nullptr)) type;
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};
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} // stack
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} // sol
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#endif // SOL_STACK_HPP
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