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ThePhD
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// 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_STACK_PUSH_HPP
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#define SOL_STACK_PUSH_HPP
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#include "stack_core.hpp"
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#include "raii.hpp"
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#include "optional.hpp"
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#include <memory>
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namespace sol {
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namespace stack {
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template<typename T, typename>
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struct pusher {
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template <typename... Args>
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static int push(lua_State* L, Args&&... args) {
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// Basically, we store all user-data like this:
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// If it's a movable/copyable value (no std::ref(x)), then we store the pointer to the new
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// data in the first sizeof(T*) bytes, and then however many bytes it takes to
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// do the actual object. Things that are std::ref or plain T* are stored as
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// just the sizeof(T*), and nothing else.
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T** pointerpointer = static_cast<T**>(lua_newuserdata(L, sizeof(T*) + sizeof(T)));
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T*& referencereference = *pointerpointer;
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T* allocationtarget = reinterpret_cast<T*>(pointerpointer + 1);
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referencereference = allocationtarget;
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std::allocator<T> alloc{};
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alloc.construct(allocationtarget, std::forward<Args>(args)...);
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luaL_newmetatable(L, &usertype_traits<T>::metatable[0]);
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lua_setmetatable(L, -2);
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return 1;
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}
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};
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template <>
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struct pusher<detail::as_reference_tag> {
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template <typename T>
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static int push(lua_State* L, T&& obj) {
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return stack::push(L, detail::ptr(obj));
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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 int push(lua_State* L, T* obj) {
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if (obj == nullptr)
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return stack::push(L, nil);
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T** pref = static_cast<T**>(lua_newuserdata(L, sizeof(T*)));
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*pref = obj;
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luaL_getmetatable(L, &usertype_traits<T*>::metatable[0]);
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lua_setmetatable(L, -2);
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return 1;
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}
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};
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template<typename T>
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struct pusher<T, std::enable_if_t<is_unique_usertype<T>::value>> {
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typedef typename unique_usertype_traits<T>::type P;
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typedef typename unique_usertype_traits<T>::actual_type Real;
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template <typename Arg, meta::EnableIf<std::is_base_of<Real, meta::Unqualified<Arg>>> = 0>
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static int push(lua_State* L, Arg&& arg) {
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if (unique_usertype_traits<T>::is_null(arg))
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return stack::push(L, nil);
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return push_deep(L, std::forward<Arg>(arg));
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}
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template <typename Arg0, typename Arg1, typename... Args>
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static int push(lua_State* L, Arg0&& arg0, Arg0&& arg1, Args&&... args) {
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return push_deep(L, std::forward<Arg0>(arg0), std::forward<Arg1>(arg1), std::forward<Args>(args)...);
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}
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template <typename... Args>
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static int push_deep(lua_State* L, Args&&... args) {
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P** pref = static_cast<P**>(lua_newuserdata(L, sizeof(P*) + sizeof(detail::special_destruct_func) + sizeof(Real)));
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detail::special_destruct_func* fx = static_cast<detail::special_destruct_func*>(static_cast<void*>(pref + 1));
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Real* mem = static_cast<Real*>(static_cast<void*>(fx + 1));
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*fx = detail::special_destruct<P, Real>;
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detail::default_construct::construct(mem, std::forward<Args>(args)...);
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*pref = unique_usertype_traits<T>::get(*mem);
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if (luaL_newmetatable(L, &usertype_traits<detail::unique_usertype<P>>::metatable[0]) == 1) {
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set_field(L, "__gc", detail::unique_destruct<P>);
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}
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lua_setmetatable(L, -2);
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return 1;
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}
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};
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template<typename T>
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struct pusher<std::reference_wrapper<T>> {
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static int push(lua_State* L, const std::reference_wrapper<T>& t) {
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return stack::push(L, std::addressof(detail::deref(t.get())));
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}
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};
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template<typename T>
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struct pusher<T, std::enable_if_t<std::is_floating_point<T>::value>> {
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static int push(lua_State* L, const T& value) {
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lua_pushnumber(L, value);
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return 1;
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}
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};
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template<typename T>
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struct pusher<T, std::enable_if_t<meta::And<std::is_integral<T>, std::is_signed<T>>::value>> {
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static int push(lua_State* L, const T& value) {
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lua_pushinteger(L, static_cast<lua_Integer>(value));
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return 1;
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}
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};
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template<typename T>
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struct pusher<T, std::enable_if_t<meta::And<std::is_integral<T>, std::is_unsigned<T>>::value>> {
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static int push(lua_State* L, const T& value) {
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typedef std::make_signed_t<T> signed_int;
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return stack::push(L, static_cast<signed_int>(value));
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}
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};
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template<typename T>
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struct pusher<T, std::enable_if_t<meta::And<meta::has_begin_end<T>, meta::Not<meta::has_key_value_pair<T>>, meta::Not<std::is_base_of<reference, T>>>::value>> {
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static int push(lua_State* L, const T& cont) {
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lua_createtable(L, static_cast<int>(cont.size()), 0);
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int tableindex = lua_gettop(L);
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unsigned index = 1;
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for(auto&& i : cont) {
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set_field(L, index++, i, tableindex);
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}
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return 1;
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}
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};
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template<typename T>
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struct pusher<T, std::enable_if_t<meta::And<meta::has_begin_end<T>, meta::has_key_value_pair<T>, meta::Not<std::is_base_of<reference, T>>>::value>> {
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static int push(lua_State* L, const T& cont) {
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lua_createtable(L, static_cast<int>(cont.size()), 0);
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int tableindex = lua_gettop(L);
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for(auto&& pair : cont) {
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set_field(L, pair.first, pair.second, tableindex);
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}
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return 1;
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}
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};
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template<typename T>
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struct pusher<T, std::enable_if_t<std::is_base_of<reference, T>::value || std::is_base_of<stack_reference, T>::value>> {
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static int push(lua_State*, T& ref) {
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return ref.push();
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}
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static int push(lua_State*, T&& ref) {
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return ref.push();
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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 int push(lua_State* L, bool b) {
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lua_pushboolean(L, b);
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return 1;
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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 int push(lua_State* L, nil_t) {
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lua_pushnil(L);
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return 1;
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}
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};
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template<>
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struct pusher<metatable_key_t> {
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static int push(lua_State* L, metatable_key_t) {
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lua_pushlstring(L, "__mt", 4);
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return 1;
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}
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};
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template<>
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struct pusher<std::remove_pointer_t<lua_CFunction>> {
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static int push(lua_State* L, lua_CFunction func, int n = 0) {
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lua_pushcclosure(L, func, n);
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return 1;
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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 int push(lua_State* L, lua_CFunction func, int n = 0) {
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lua_pushcclosure(L, func, n);
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return 1;
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}
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};
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template<>
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struct pusher<c_closure> {
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static int push(lua_State* L, c_closure closure) {
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lua_pushcclosure(L, closure.c_function, closure.upvalues);
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return 1;
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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 int push(lua_State* L, void* userdata) {
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lua_pushlightuserdata(L, userdata);
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return 1;
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}
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};
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template<>
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struct pusher<light_userdata_value> {
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static int push(lua_State* L, light_userdata_value userdata) {
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lua_pushlightuserdata(L, userdata);
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return 1;
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}
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};
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template<>
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struct pusher<userdata_value> {
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static int push(lua_State* L, userdata_value data) {
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void** ud = static_cast<void**>(lua_newuserdata(L, sizeof(void*)));
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*ud = data.value;
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return 1;
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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 int 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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return 1;
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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 int push(lua_State* L, const char (&str)[N]) {
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lua_pushlstring(L, str, N - 1);
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return 1;
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}
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};
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template <>
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struct pusher<char> {
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static int push(lua_State* L, char c) {
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const char str[2] = { c, '\0'};
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return stack::push(L, str);
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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 int push(lua_State* L, const std::string& str) {
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lua_pushlstring(L, str.c_str(), str.size());
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return 1;
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}
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};
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template<typename... Args>
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struct pusher<std::tuple<Args...>> {
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template <std::size_t... I, typename T>
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static int push(std::index_sequence<I...>, lua_State* L, T&& t) {
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int pushcount = 0;
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(void)detail::swallow{ 0, (pushcount += stack::push(L,
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detail::forward_get<I>(t)
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), 0)... };
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return pushcount;
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}
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template <typename T>
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static int push(lua_State* L, T&& t) {
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return push(std::index_sequence_for<Args...>(), L, std::forward<T>(t));
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}
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};
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template<typename A, typename B>
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struct pusher<std::pair<A, B>> {
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template <typename T>
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static int push(lua_State* L, T&& t) {
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int pushcount = stack::push(L, detail::forward_get<0>(t));
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pushcount += stack::push(L, detail::forward_get<1>(t));
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return pushcount;
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}
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};
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template<typename O>
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struct pusher<optional<O>> {
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template <typename T>
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static int push(lua_State* L, T&& t) {
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if (t == nullopt) {
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return stack::push(L, nullopt);
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}
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return stack::push(L, t.value());
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}
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};
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template<>
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struct pusher<nullopt_t> {
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static int push(lua_State* L, nullopt_t) {
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return stack::push(L, nil);
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}
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};
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template<>
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struct pusher<this_state> {
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static int push(lua_State*, const this_state&) {
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return 0;
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}
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};
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} // stack
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} // sol
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#endif // SOL_STACK_PUSH_HPP
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