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stack_field.hpp
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// sol2
// The MIT License (MIT)
// Copyright (c) 2013-2022 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_FIELD_HPP
#define SOL_STACK_FIELD_HPP
#include <sol/stack_core.hpp>
#include <sol/stack_push.hpp>
#include <sol/stack_get.hpp>
#include <sol/stack_check_get.hpp>
namespace sol { namespace stack {
namespace stack_detail {
template <typename T, bool global, bool raw>
inline constexpr bool is_get_direct_tableless_v = (global && !raw && meta::is_c_str_or_string_v<T>);
template <typename T, bool global, bool raw>
inline constexpr bool is_get_direct_v = (is_get_direct_tableless_v<T, global, raw>) // cf-hack
|| (!global && !raw && (meta::is_c_str_or_string_v<T> || meta::is_string_of_v<T, char>)) // cf-hack
|| (!global && raw && (std::is_integral_v<T> && !std::is_same_v<T, bool>))
#if SOL_LUA_VERSION_I_ >= 503
|| (!global && !raw && (std::is_integral_v<T> && !std::is_same_v<T, bool>))
#endif // integer keys 5.3 or better
#if SOL_LUA_VERSION_I_ >= 502
|| (!global && raw && std::is_pointer_v<T> && std::is_void_v<std::remove_pointer_t<T>>)
#endif // void pointer keys 5.2 or better
;
template <typename T, bool global, bool raw>
inline constexpr bool is_set_direct_tableless_v = (global && !raw && meta::is_c_str_or_string_v<T>);
template <typename T, bool global, bool raw>
inline constexpr bool is_set_direct_v = (is_set_direct_tableless_v<T, global, raw>) // cf-hack
|| (!global && !raw && (meta::is_c_str_or_string_v<T> || meta::is_string_of_v<T, char>)) // cf-hack
|| (!global && raw && (std::is_integral_v<T> && !std::is_same_v<T, bool>)) // cf-hack
#if SOL_LUA_VERSION_I_ >= 503
|| (!global && !raw && (std::is_integral_v<T> && !std::is_same_v<T, bool>))
#endif // integer keys 5.3 or better
#if SOL_LUA_VERSION_I_ >= 502
|| (!global && raw && (std::is_pointer_v<T> && std::is_void_v<std::remove_pointer_t<T>>))
#endif // void pointer keys 5.2 or better
;
} // namespace stack_detail
template <typename T, bool global, bool raw, typename>
struct field_getter {
static inline constexpr int default_table_index
= meta::conditional_t<stack_detail::is_get_direct_v<T, global, raw>, std::integral_constant<int, -1>, std::integral_constant<int, -2>>::value;
template <typename Key>
void get(lua_State* L, Key&& key, int tableindex = default_table_index) {
if constexpr (std::is_same_v<T, update_if_empty_t> || std::is_same_v<T, override_value_t> || std::is_same_v<T, create_if_nil_t>) {
(void)L;
(void)key;
(void)tableindex;
}
else if constexpr (std::is_same_v<T, env_key_t>) {
(void)key;
#if SOL_LUA_VERSION_I_ < 502
// Use lua_setfenv
lua_getfenv(L, tableindex);
#else
// Use upvalues as explained in Lua 5.2 and beyond's manual
if (lua_getupvalue(L, tableindex, 1) == nullptr) {
push(L, lua_nil);
}
#endif
}
else if constexpr (std::is_same_v<T, metatable_key_t>) {
(void)key;
if (lua_getmetatable(L, tableindex) == 0)
push(L, lua_nil);
}
else if constexpr (raw) {
if constexpr (std::is_integral_v<T> && !std::is_same_v<bool, T>) {
lua_rawgeti(L, tableindex, static_cast<lua_Integer>(key));
}
#if SOL_LUA_VERSION_I_ >= 502
else if constexpr (std::is_pointer_v<T> && std::is_void_v<std::remove_pointer_t<T>>) {
lua_rawgetp(L, tableindex, key);
}
#endif // Lua 5.2.x+
else {
push(L, std::forward<Key>(key));
lua_rawget(L, tableindex);
}
}
else {
if constexpr (meta::is_c_str_or_string_v<T>) {
if constexpr (global) {
(void)tableindex;
lua_getglobal(L, &key[0]);
}
else {
if constexpr (std::is_same_v<std::decay_t<Key>, const char*>) {
// Handle const char* case
if (key != nullptr) {
lua_getfield(L, tableindex, key);
} else {
push(L, lua_nil);
}
} else {
// Handle std::string case
lua_getfield(L, tableindex, key.c_str());
}
}
}
else if constexpr (std::is_same_v<T, meta_function>) {
const auto& real_key = to_string(key);
lua_getfield(L, tableindex, &real_key[0]);
}
#if SOL_LUA_VERSION_I_ >= 503
else if constexpr (std::is_integral_v<T> && !std::is_same_v<bool, T>) {
lua_geti(L, tableindex, static_cast<lua_Integer>(key));
}
#endif // Lua 5.3.x+
else {
push(L, std::forward<Key>(key));
lua_gettable(L, tableindex);
}
}
}
};
template <typename... Args, bool b, bool raw, typename C>
struct field_getter<std::tuple<Args...>, b, raw, C> {
template <std::size_t... I, typename Keys>
void apply(std::index_sequence<0, I...>, lua_State* L, Keys&& keys, int tableindex) {
get_field<b, raw>(L, std::get<0>(std::forward<Keys>(keys)), tableindex);
void(detail::swallow { (get_field<false, raw>(L, std::get<I>(std::forward<Keys>(keys))), 0)... });
reference saved(L, -1);
lua_pop(L, static_cast<int>(sizeof...(I)));
saved.push();
}
template <typename Keys>
void get(lua_State* L, Keys&& keys) {
apply(std::make_index_sequence<sizeof...(Args)>(), L, std::forward<Keys>(keys), lua_absindex(L, -1));
}
template <typename Keys>
void get(lua_State* L, Keys&& keys, int tableindex) {
apply(std::make_index_sequence<sizeof...(Args)>(), L, std::forward<Keys>(keys), tableindex);
}
};
template <typename A, typename B, bool b, bool raw, typename C>
struct field_getter<std::pair<A, B>, b, raw, C> {
template <typename Keys>
void get(lua_State* L, Keys&& keys, int tableindex) {
get_field<b, raw>(L, std::get<0>(std::forward<Keys>(keys)), tableindex);
get_field<false, raw>(L, std::get<1>(std::forward<Keys>(keys)));
reference saved(L, -1);
lua_pop(L, static_cast<int>(2));
saved.push();
}
template <typename Keys>
void get(lua_State* L, Keys&& keys) {
get_field<b, raw>(L, std::get<0>(std::forward<Keys>(keys)));
get_field<false, raw>(L, std::get<1>(std::forward<Keys>(keys)));
reference saved(L, -1);
lua_pop(L, static_cast<int>(2));
saved.push();
}
};
template <typename T, bool global, bool raw, typename>
struct field_setter {
static constexpr int default_table_index
= meta::conditional_t<stack_detail::is_set_direct_v<T, global, raw>, std::integral_constant<int, -2>, std::integral_constant<int, -3>>::value;
template <typename Key, typename Value>
void set(lua_State* L, Key&& key, Value&& value, int tableindex = default_table_index) {
if constexpr (std::is_same_v<T, update_if_empty_t> || std::is_same_v<T, override_value_t>) {
(void)L;
(void)key;
(void)value;
(void)tableindex;
}
else if constexpr (std::is_same_v<T, metatable_key_t>) {
(void)key;
push(L, std::forward<Value>(value));
lua_setmetatable(L, tableindex);
}
else if constexpr (raw) {
if constexpr (std::is_integral_v<T> && !std::is_same_v<bool, T>) {
push(L, std::forward<Value>(value));
lua_rawseti(L, tableindex, static_cast<lua_Integer>(key));
}
#if SOL_LUA_VERSION_I_ >= 502
else if constexpr (std::is_pointer_v<T> && std::is_void_v<std::remove_pointer_t<T>>) {
push(L, std::forward<Value>(value));
lua_rawsetp(L, tableindex, std::forward<Key>(key));
}
#endif // Lua 5.2.x
else {
push(L, std::forward<Key>(key));
push(L, std::forward<Value>(value));
lua_rawset(L, tableindex);
}
}
else {
if constexpr (meta::is_c_str_or_string_v<T>) {
if constexpr (global) {
push(L, std::forward<Value>(value));
lua_setglobal(L, &key[0]);
(void)tableindex;
}
else {
push(L, std::forward<Value>(value));
lua_setfield(L, tableindex, &key[0]);
}
}
#if SOL_LUA_VERSION_I_ >= 503
else if constexpr (std::is_integral_v<T> && !std::is_same_v<bool, T>) {
push(L, std::forward<Value>(value));
lua_seti(L, tableindex, static_cast<lua_Integer>(key));
}
#endif // Lua 5.3.x
else {
push(L, std::forward<Key>(key));
push(L, std::forward<Value>(value));
lua_settable(L, tableindex);
}
}
}
};
template <typename... Args, bool b, bool raw, typename C>
struct field_setter<std::tuple<Args...>, b, raw, C> {
template <bool g, std::size_t I, typename Keys, typename Value>
void apply(std::index_sequence<I>, lua_State* L, Keys&& keys, Value&& value, int tableindex) {
I < 1 ? set_field<g, raw>(L, std::get<I>(std::forward<Keys>(keys)), std::forward<Value>(value), tableindex)
: set_field<g, raw>(L, std::get<I>(std::forward<Keys>(keys)), std::forward<Value>(value));
}
template <bool g, std::size_t I0, std::size_t I1, std::size_t... I, typename Keys, typename Value>
void apply(std::index_sequence<I0, I1, I...>, lua_State* L, Keys&& keys, Value&& value, int tableindex) {
I0 < 1 ? get_field<g, raw>(L, std::get<I0>(std::forward<Keys>(keys)), tableindex)
: get_field<g, raw>(L, std::get<I0>(std::forward<Keys>(keys)), -1);
apply<false>(std::index_sequence<I1, I...>(), L, std::forward<Keys>(keys), std::forward<Value>(value), -1);
}
template <bool g, std::size_t I0, std::size_t... I, typename Keys, typename Value>
void top_apply(std::index_sequence<I0, I...>, lua_State* L, Keys&& keys, Value&& value, int tableindex) {
apply<g>(std::index_sequence<I0, I...>(), L, std::forward<Keys>(keys), std::forward<Value>(value), tableindex);
lua_pop(L, static_cast<int>(sizeof...(I)));
}
template <typename Keys, typename Value>
void set(lua_State* L, Keys&& keys, Value&& value, int tableindex = -3) {
top_apply<b>(std::make_index_sequence<sizeof...(Args)>(), L, std::forward<Keys>(keys), std::forward<Value>(value), tableindex);
}
};
template <typename A, typename B, bool b, bool raw, typename C>
struct field_setter<std::pair<A, B>, b, raw, C> {
template <typename Keys, typename Value>
void set(lua_State* L, Keys&& keys, Value&& value, int tableindex = -1) {
get_field<b, raw>(L, std::get<0>(std::forward<Keys>(keys)), tableindex);
set_field<false, raw>(L, std::get<1>(std::forward<Keys>(keys)), std::forward<Value>(value), lua_gettop(L));
lua_pop(L, 1);
}
};
}} // namespace sol::stack
#endif // SOL_STACK_FIELD_HPP