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sol2/sol/stack_get.hpp

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// The MIT License (MIT)
// Copyright (c) 2013-2016 Rapptz, ThePhD and contributors
// Permission is hereby granted, free of charge, to any person obtaining a copy of
// this software and associated documentation files (the "Software"), to deal in
// the Software without restriction, including without limitation the rights to
// use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
// the Software, and to permit persons to whom the Software is furnished to do so,
// subject to the following conditions:
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
// FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
// COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
// IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
// CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
#ifndef SOL_STACK_GET_HPP
#define SOL_STACK_GET_HPP
#include "stack_core.hpp"
#include "usertype_traits.hpp"
#include "inheritance.hpp"
#include "overload.hpp"
#include "error.hpp"
#include <memory>
#include <functional>
#include <utility>
#ifdef SOL_CODECVT_SUPPORT
#include <codecvt>
#include <locale>
#endif
namespace sol {
namespace stack {
template<typename T, typename>
struct getter {
static T& get(lua_State* L, int index, record& tracking) {
return getter<sol::detail::as_value_tag<T>>{}.get(L, index, tracking);
}
};
template<typename T>
struct getter<T, std::enable_if_t<std::is_floating_point<T>::value>> {
static T get(lua_State* L, int index, record& tracking) {
tracking.use(1);
return static_cast<T>(lua_tonumber(L, index));
}
};
template<typename T>
struct getter<T, std::enable_if_t<meta::all<std::is_integral<T>, std::is_signed<T>>::value>> {
static T get(lua_State* L, int index, record& tracking) {
tracking.use(1);
return static_cast<T>(lua_tointeger(L, index));
}
};
template<typename T>
struct getter<T, std::enable_if_t<meta::all<std::is_integral<T>, std::is_unsigned<T>>::value>> {
static T get(lua_State* L, int index, record& tracking) {
tracking.use(1);
return static_cast<T>(lua_tointeger(L, index));
}
};
template<typename T>
struct getter<T, std::enable_if_t<std::is_enum<T>::value>> {
static T get(lua_State* L, int index, record& tracking) {
tracking.use(1);
return static_cast<T>(lua_tointegerx(L, index, nullptr));
}
};
template<typename T>
struct getter<as_table_t<T>, std::enable_if_t<!meta::has_key_value_pair<meta::unqualified_t<T>>::value>> {
static T get(lua_State* L, int relindex, record& tracking) {
typedef typename T::value_type V;
return get(types<V>(), L, relindex, tracking);
}
template <typename V>
static T get(types<V>, lua_State* L, int relindex, record& tracking) {
tracking.use(1);
int index = lua_absindex(L, relindex);
T arr;
#if SOL_LUA_VERSION >= 503
// This method is HIGHLY performant over regular table iteration thanks to the Lua API changes in 5.3
for (lua_Integer i = 0; ; i += lua_size<V>::value, lua_pop(L, lua_size<V>::value)) {
bool isnil = false;
for (int vi = 0; vi < lua_size<V>::value; ++vi) {
type t = static_cast<type>(lua_geti(L, index, i + vi));
isnil = t == type::lua_nil;
if (isnil) {
if (i == 0) {
break;
}
lua_pop(L, (vi + 1));
return arr;
}
}
if (isnil)
continue;
arr.push_back(stack::get<V>(L, -lua_size<V>::value));
}
#else
// Zzzz slower but necessary thanks to the lower version API and missing functions qq
for (lua_Integer i = 0; ; i += lua_size<V>::value, lua_pop(L, lua_size<V>::value)) {
bool isnil = false;
for (int vi = 0; vi < lua_size<V>::value; ++vi) {
lua_pushinteger(L, i);
lua_gettable(L, index);
type t = type_of(L, -1);
isnil = t == type::lua_nil;
if (isnil) {
if (i == 0) {
break;
}
lua_pop(L, (vi + 1));
return arr;
}
}
if (isnil)
continue;
arr.push_back(stack::get<V>(L, -1));
}
#endif
return arr;
}
};
template<typename T>
struct getter<as_table_t<T>, std::enable_if_t<meta::has_key_value_pair<meta::unqualified_t<T>>::value>> {
static T get(lua_State* L, int index, record& tracking) {
typedef typename T::value_type P;
typedef typename P::first_type K;
typedef typename P::second_type V;
return get(types<K, V>(), L, index, tracking);
}
template <typename K, typename V>
static T get(types<K, V>, lua_State* L, int relindex, record& tracking) {
tracking.use(1);
T associative;
int index = lua_absindex(L, relindex);
lua_pushnil(L);
while (lua_next(L, index) != 0) {
decltype(auto) key = stack::check_get<K>(L, -2);
if (!key) {
lua_pop(L, 1);
continue;
}
associative.emplace(std::forward<decltype(*key)>(*key), stack::get<V>(L, -1));
lua_pop(L, 1);
}
return associative;
}
};
template<typename T>
struct getter<nested<T>, std::enable_if_t<!is_container<T>::value>> {
static T get(lua_State* L, int index, record& tracking) {
getter<T> g;
// VC++ has a bad warning here: shut it up
(void)g;
return g.get(L, index, tracking);
}
};
template<typename T>
struct getter<nested<T>, std::enable_if_t<meta::all<is_container<T>, meta::neg<meta::has_key_value_pair<meta::unqualified_t<T>>>>::value>> {
static T get(lua_State* L, int index, record& tracking) {
typedef typename T::value_type V;
getter<as_table_t<T>> g;
// VC++ has a bad warning here: shut it up
(void)g;
return g.get(types<nested<V>>(), L, index, tracking);
}
};
template<typename T>
struct getter<nested<T>, std::enable_if_t<meta::all<is_container<T>, meta::has_key_value_pair<meta::unqualified_t<T>>>::value>> {
static T get(lua_State* L, int index, record& tracking) {
typedef typename T::value_type P;
typedef typename P::first_type K;
typedef typename P::second_type V;
getter<as_table_t<T>> g;
// VC++ has a bad warning here: shut it up
(void)g;
return g.get(types<K, nested<V>>(), L, index, tracking);
}
};
template<typename T>
struct getter<T, std::enable_if_t<std::is_base_of<reference, T>::value || std::is_base_of<stack_reference, T>::value>> {
static T get(lua_State* L, int index, record& tracking) {
tracking.use(1);
return T(L, index);
}
};
template<>
struct getter<userdata_value> {
static userdata_value get(lua_State* L, int index, record& tracking) {
tracking.use(1);
return userdata_value(lua_touserdata(L, index));
}
};
template<>
struct getter<lightuserdata_value> {
static lightuserdata_value get(lua_State* L, int index, record& tracking) {
tracking.use(1);
return lightuserdata_value(lua_touserdata(L, index));
}
};
template<typename T>
struct getter<light<T>> {
static light<T> get(lua_State* L, int index, record& tracking) {
tracking.use(1);
return light<T>(static_cast<T*>(lua_touserdata(L, index)));
}
};
template<typename T>
struct getter<user<T>> {
static T& get(lua_State* L, int index, record& tracking) {
tracking.use(1);
return *static_cast<T*>(lua_touserdata(L, index));
}
};
template<typename T>
struct getter<user<T*>> {
static T* get(lua_State* L, int index, record& tracking) {
tracking.use(1);
return static_cast<T*>(lua_touserdata(L, index));
}
};
template<>
struct getter<type> {
static type get(lua_State *L, int index, record& tracking) {
tracking.use(1);
return static_cast<type>(lua_type(L, index));
}
};
template<>
struct getter<bool> {
static bool get(lua_State* L, int index, record& tracking) {
tracking.use(1);
return lua_toboolean(L, index) != 0;
}
};
template<>
struct getter<std::string> {
static std::string get(lua_State* L, int index, record& tracking) {
tracking.use(1);
std::size_t len;
auto str = lua_tolstring(L, index, &len);
return std::string( str, len );
}
};
template <>
struct getter<string_detail::string_shim> {
string_detail::string_shim get(lua_State* L, int index, record& tracking) {
tracking.use(1);
size_t len;
const char* p = lua_tolstring(L, index, &len);
return string_detail::string_shim(p, len);
}
};
template<>
struct getter<const char*> {
static const char* get(lua_State* L, int index, record& tracking) {
tracking.use(1);
return lua_tostring(L, index);
}
};
template<>
struct getter<char> {
static char get(lua_State* L, int index, record& tracking) {
tracking.use(1);
size_t len;
auto str = lua_tolstring(L, index, &len);
return len > 0 ? str[0] : '\0';
}
};
#ifdef SOL_CODECVT_SUPPORT
template<>
struct getter<std::wstring> {
static std::wstring get(lua_State* L, int index, record& tracking) {
tracking.use(1);
size_t len;
auto str = lua_tolstring(L, index, &len);
if (len < 1)
return std::wstring();
if (sizeof(wchar_t) == 2) {
static std::wstring_convert<std::codecvt_utf8_utf16<wchar_t>> convert;
std::wstring r = convert.from_bytes(str, str + len);
#ifdef __MINGW32__
// Fuck you, MinGW, and fuck you libstdc++ for introducing this absolutely asinine bug
// https://sourceforge.net/p/mingw-w64/bugs/538/
// http://chat.stackoverflow.com/transcript/message/32271369#32271369
for (auto& c : r) {
uint8_t* b = reinterpret_cast<uint8_t*>(&c);
std::swap(b[0], b[1]);
}
#endif
return r;
}
static std::wstring_convert<std::codecvt_utf8<wchar_t>> convert;
std::wstring r = convert.from_bytes(str, str + len);
return r;
}
};
template<>
struct getter<std::u16string> {
static std::u16string get(lua_State* L, int index, record& tracking) {
tracking.use(1);
size_t len;
auto str = lua_tolstring(L, index, &len);
if (len < 1)
return std::u16string();
#ifdef _MSC_VER
static std::wstring_convert<std::codecvt_utf8_utf16<int16_t>, int16_t> convert;
auto intd = convert.from_bytes(str, str + len);
std::u16string r(intd.size(), '\0');
std::memcpy(&r[0], intd.data(), intd.size() * sizeof(char16_t));
#else
static std::wstring_convert<std::codecvt_utf8_utf16<char16_t>, char16_t> convert;
std::u16string r = convert.from_bytes(str, str + len);
#endif // VC++ is a shit
return r;
}
};
template<>
struct getter<std::u32string> {
static std::u32string get(lua_State* L, int index, record& tracking) {
tracking.use(1);
size_t len;
auto str = lua_tolstring(L, index, &len);
if (len < 1)
return std::u32string();
#ifdef _MSC_VER
static std::wstring_convert<std::codecvt_utf8<int32_t>, int32_t> convert;
auto intd = convert.from_bytes(str, str + len);
std::u32string r(intd.size(), '\0');
std::memcpy(&r[0], intd.data(), r.size() * sizeof(char32_t));
#else
static std::wstring_convert<std::codecvt_utf8<char32_t>, char32_t> convert;
std::u32string r = convert.from_bytes(str, str + len);
#endif // VC++ is a shit
return r;
}
};
template<>
struct getter<wchar_t> {
static wchar_t get(lua_State* L, int index, record& tracking) {
auto str = getter<std::wstring>{}.get(L, index, tracking);
return str.size() > 0 ? str[0] : wchar_t(0);
}
};
template<>
struct getter<char16_t> {
static char16_t get(lua_State* L, int index, record& tracking) {
auto str = getter<std::u16string>{}.get(L, index, tracking);
return str.size() > 0 ? str[0] : char16_t(0);
}
};
template<>
struct getter<char32_t> {
static char32_t get(lua_State* L, int index, record& tracking) {
auto str = getter<std::u32string>{}.get(L, index, tracking);
return str.size() > 0 ? str[0] : char32_t(0);
}
};
#endif // codecvt header support
template<>
struct getter<meta_function> {
static meta_function get(lua_State *L, int index, record& tracking) {
tracking.use(1);
const char* name = getter<const char*>{}.get(L, index, tracking);
for (std::size_t i = 0; i < meta_function_names.size(); ++i)
if (meta_function_names[i] == name)
return static_cast<meta_function>(i);
return meta_function::construct;
}
};
template<>
struct getter<lua_nil_t> {
static lua_nil_t get(lua_State*, int, record& tracking) {
tracking.use(1);
return lua_nil;
}
};
template<>
struct getter<std::nullptr_t> {
static std::nullptr_t get(lua_State*, int, record& tracking) {
tracking.use(1);
return nullptr;
}
};
template<>
struct getter<nullopt_t> {
static nullopt_t get(lua_State*, int, record& tracking) {
tracking.use(1);
return nullopt;
}
};
template<>
struct getter<this_state> {
static this_state get(lua_State* L, int, record& tracking) {
tracking.use(0);
return this_state{ L };
}
};
template<>
struct getter<lua_CFunction> {
static lua_CFunction get(lua_State* L, int index, record& tracking) {
tracking.use(1);
return lua_tocfunction(L, index);
}
};
template<>
struct getter<c_closure> {
static c_closure get(lua_State* L, int index, record& tracking) {
tracking.use(1);
return c_closure(lua_tocfunction(L, index), -1);
}
};
template<>
struct getter<error> {
static error get(lua_State* L, int index, record& tracking) {
tracking.use(1);
size_t sz = 0;
const char* err = lua_tolstring(L, index, &sz);
if (err == nullptr) {
return error(detail::direct_error, "");
}
return error(detail::direct_error, std::string(err, sz));
}
};
template<>
struct getter<void*> {
static void* get(lua_State* L, int index, record& tracking) {
tracking.use(1);
return lua_touserdata(L, index);
}
};
template<typename T>
struct getter<detail::as_value_tag<T>> {
static T* get_no_lua_nil(lua_State* L, int index, record& tracking) {
tracking.use(1);
void** pudata = static_cast<void**>(lua_touserdata(L, index));
void* udata = *pudata;
return get_no_lua_nil_from(L, udata, index, tracking);
}
static T* get_no_lua_nil_from(lua_State* L, void* udata, int index, record&) {
if (detail::has_derived<T>::value && luaL_getmetafield(L, index, &detail::base_class_cast_key()[0]) != 0) {
void* basecastdata = lua_touserdata(L, -1);
detail::inheritance_cast_function ic = (detail::inheritance_cast_function)basecastdata;
// use the casting function to properly adjust the pointer for the desired T
udata = ic(udata, detail::id_for<T>::value);
lua_pop(L, 1);
}
T* obj = static_cast<T*>(udata);
return obj;
}
static T& get(lua_State* L, int index, record& tracking) {
return *get_no_lua_nil(L, index, tracking);
}
};
template<typename T>
struct getter<detail::as_pointer_tag<T>> {
static T* get(lua_State* L, int index, record& tracking) {
type t = type_of(L, index);
if (t == type::lua_nil) {
tracking.use(1);
return nullptr;
}
getter<detail::as_value_tag<T>> g;
// Avoid VC++ warning
(void)g;
return g.get_no_lua_nil(L, index, tracking);
}
};
template<typename T>
struct getter<non_null<T*>> {
static T* get(lua_State* L, int index, record& tracking) {
getter<detail::as_value_tag<T>> g;
// Avoid VC++ warning
(void)g;
return g.get_no_lua_nil(L, index, tracking);
}
};
template<typename T>
struct getter<T&> {
static T& get(lua_State* L, int index, record& tracking) {
getter<detail::as_value_tag<T>> g;
// Avoid VC++ warning
(void)g;
return g.get(L, index, tracking);
}
};
template<typename T>
struct getter<std::reference_wrapper<T>> {
static T& get(lua_State* L, int index, record& tracking) {
getter<T&> g;
// Avoid VC++ warning
(void)g;
return g.get(L, index, tracking);
}
};
template<typename T>
struct getter<T*> {
static T* get(lua_State* L, int index, record& tracking) {
getter<detail::as_pointer_tag<T>> g;
// Avoid VC++ warning
(void)g;
return g.get(L, index, tracking);
}
};
template<typename T>
struct getter<T, std::enable_if_t<is_unique_usertype<T>::value>> {
typedef typename unique_usertype_traits<T>::type P;
typedef typename unique_usertype_traits<T>::actual_type Real;
static Real& get(lua_State* L, int index, record& tracking) {
tracking.use(1);
P** pref = static_cast<P**>(lua_touserdata(L, index));
detail::special_destruct_func* fx = static_cast<detail::special_destruct_func*>(static_cast<void*>(pref + 1));
Real* mem = static_cast<Real*>(static_cast<void*>(fx + 1));
return *mem;
}
};
template<typename... Args>
struct getter<std::tuple<Args...>> {
typedef std::tuple<decltype(stack::get<Args>(nullptr, 0))...> R;
template <typename... TArgs>
static R apply(std::index_sequence<>, lua_State*, int, record&, TArgs&&... args) {
// Fuck you too, VC++
return R{std::forward<TArgs>(args)...};
}
template <std::size_t I, std::size_t... Ix, typename... TArgs>
static R apply(std::index_sequence<I, Ix...>, lua_State* L, int index, record& tracking, TArgs&&... args) {
// Fuck you too, VC++
typedef std::tuple_element_t<I, std::tuple<Args...>> T;
return apply(std::index_sequence<Ix...>(), L, index, tracking, std::forward<TArgs>(args)..., stack::get<T>(L, index + tracking.used, tracking));
}
static R get(lua_State* L, int index, record& tracking) {
return apply(std::make_index_sequence<sizeof...(Args)>(), L, index, tracking);
}
};
template<typename A, typename B>
struct getter<std::pair<A, B>> {
static decltype(auto) get(lua_State* L, int index, record& tracking) {
return std::pair<decltype(stack::get<A>(L, index)), decltype(stack::get<B>(L, index))>{stack::get<A>(L, index, tracking), stack::get<B>(L, index + tracking.used, tracking)};
}
};
} // stack
} // sol
#endif // SOL_STACK_GET_HPP
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