mirror of
https://github.com/ThePhD/sol2.git
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249 lines
9.2 KiB
C++
249 lines
9.2 KiB
C++
// sol3
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// The MIT License (MIT)
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// Copyright (c) 2013-2019 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_FIELD_HPP
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#define SOL_STACK_FIELD_HPP
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#include <sol/stack_core.hpp>
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#include <sol/stack_push.hpp>
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#include <sol/stack_get.hpp>
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#include <sol/stack_check_get.hpp>
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namespace sol { namespace stack {
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template <typename T, bool global, bool raw, typename>
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struct field_getter {
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static constexpr int default_table_index = meta::conditional_t < meta::is_c_str_v<T>
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#if SOL_LUA_VERSION >= 503
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|| (std::is_integral_v<T> && !std::is_same_v<T, bool>)
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#endif // integer global keys 5.3 or better
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|| (raw && std::is_void_v<std::remove_pointer_t<T>>),
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std::integral_constant<int, -1>, std::integral_constant<int, -2>> ::value;
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template <typename Key>
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void get(lua_State* L, Key&& key, int tableindex = default_table_index) {
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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>) {
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(void)L;
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(void)key;
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(void)tableindex;
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}
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else if constexpr (std::is_same_v<T, env_key_t>) {
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(void)key;
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#if SOL_LUA_VERSION < 502
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// Use lua_setfenv
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lua_getfenv(L, tableindex);
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#else
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// Use upvalues as explained in Lua 5.2 and beyond's manual
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if (lua_getupvalue(L, tableindex, 1) == nullptr) {
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push(L, lua_nil);
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}
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#endif
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}
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else if constexpr (std::is_same_v<T, metatable_key_t>) {
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(void)key;
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if (lua_getmetatable(L, tableindex) == 0)
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push(L, lua_nil);
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}
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else if constexpr (raw) {
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if constexpr (std::is_integral_v<T> && !std::is_same_v<bool, T>) {
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lua_rawgeti(L, tableindex, static_cast<lua_Integer>(key));
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}
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#if SOL_LUA_VERSION >= 502
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else if constexpr (std::is_void_v<std::remove_pointer_t<T>>) {
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lua_rawgetp(L, tableindex, key);
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}
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#endif // Lua 5.2.x+
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else {
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push(L, std::forward<Key>(key));
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lua_rawget(L, tableindex);
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}
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}
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else {
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if constexpr (meta::is_c_str_v<T>) {
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if constexpr (global) {
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(void)tableindex;
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lua_getglobal(L, &key[0]);
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}
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else {
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lua_getfield(L, tableindex, &key[0]);
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}
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}
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#if SOL_LUA_VERSION >= 503
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else if constexpr (std::is_integral_v<T> && !std::is_same_v<bool, T>) {
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lua_geti(L, tableindex, static_cast<lua_Integer>(key));
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}
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#endif // Lua 5.3.x+
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else {
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push(L, std::forward<Key>(key));
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lua_gettable(L, tableindex);
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}
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}
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}
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};
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template <typename... Args, bool b, bool raw, typename C>
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struct field_getter<std::tuple<Args...>, b, raw, C> {
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template <std::size_t... I, typename Keys>
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void apply(std::index_sequence<0, I...>, lua_State* L, Keys&& keys, int tableindex) {
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get_field<b, raw>(L, std::get<0>(std::forward<Keys>(keys)), tableindex);
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void(detail::swallow{ (get_field<false, raw>(L, std::get<I>(std::forward<Keys>(keys))), 0)... });
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reference saved(L, -1);
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lua_pop(L, static_cast<int>(sizeof...(I)));
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saved.push();
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}
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template <typename Keys>
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void get(lua_State* L, Keys&& keys) {
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apply(std::make_index_sequence<sizeof...(Args)>(), L, std::forward<Keys>(keys), lua_absindex(L, -1));
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}
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template <typename Keys>
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void get(lua_State* L, Keys&& keys, int tableindex) {
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apply(std::make_index_sequence<sizeof...(Args)>(), L, std::forward<Keys>(keys), tableindex);
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}
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};
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template <typename A, typename B, bool b, bool raw, typename C>
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struct field_getter<std::pair<A, B>, b, raw, C> {
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template <typename Keys>
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void get(lua_State* L, Keys&& keys, int tableindex) {
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get_field<b, raw>(L, std::get<0>(std::forward<Keys>(keys)), tableindex);
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get_field<false, raw>(L, std::get<1>(std::forward<Keys>(keys)));
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reference saved(L, -1);
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lua_pop(L, static_cast<int>(2));
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saved.push();
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}
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template <typename Keys>
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void get(lua_State* L, Keys&& keys) {
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get_field<b, raw>(L, std::get<0>(std::forward<Keys>(keys)));
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get_field<false, raw>(L, std::get<1>(std::forward<Keys>(keys)));
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reference saved(L, -1);
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lua_pop(L, static_cast<int>(2));
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saved.push();
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}
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};
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template <typename T, bool global, bool raw, typename>
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struct field_setter {
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static constexpr int default_table_index
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= meta::conditional_t < (meta::is_c_str_v<T> || meta::is_string_of_v<T, char>) || (std::is_integral_v<T> && !std::is_same_v<T, bool>)
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|| (std::is_integral_v<T> && !std::is_same_v<T, bool>) || (raw && std::is_void_v<std::remove_pointer_t<T>>),
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std::integral_constant<int, -2>, std::integral_constant<int, -3>> ::value;
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template <typename Key, typename Value>
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void set(lua_State* L, Key&& key, Value&& value, int tableindex = default_table_index) {
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if constexpr (std::is_same_v<T, update_if_empty_t> || std::is_same_v<T, override_value_t>) {
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(void)L;
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(void)key;
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(void)value;
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(void)tableindex;
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}
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else if constexpr (std::is_same_v<T, metatable_key_t>) {
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(void)key;
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push(L, std::forward<Value>(value));
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lua_setmetatable(L, tableindex);
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}
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else if constexpr (raw) {
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if constexpr (std::is_integral_v<T> && !std::is_same_v<bool, T>) {
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push(L, std::forward<Value>(value));
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lua_rawseti(L, tableindex, static_cast<lua_Integer>(key));
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}
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#if SOL_LUA_VERSION >= 502
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else if constexpr (std::is_void_v<std::remove_pointer_t<T>>) {
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push(L, std::forward<Value>(value));
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lua_rawsetp(L, tableindex, std::forward<Key>(key));
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}
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#endif // Lua 5.2.x
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else {
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push(L, std::forward<Key>(key));
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push(L, std::forward<Value>(value));
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lua_rawset(L, tableindex);
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}
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}
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else {
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if constexpr (meta::is_c_str_v<T> || meta::is_string_of_v<T, char>) {
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if constexpr (global) {
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push(L, std::forward<Value>(value));
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lua_setglobal(L, &key[0]);
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(void)tableindex;
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}
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else {
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push(L, std::forward<Value>(value));
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lua_setfield(L, tableindex, &key[0]);
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}
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}
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#if SOL_LUA_VERSION >= 503
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else if constexpr (std::is_integral_v<T> && !std::is_same_v<bool, T>) {
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push(L, std::forward<Value>(value));
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lua_seti(L, tableindex, static_cast<lua_Integer>(key));
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}
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#endif // Lua 5.3.x
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else {
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push(L, std::forward<Key>(key));
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push(L, std::forward<Value>(value));
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lua_settable(L, tableindex);
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}
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}
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}
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};
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template <typename... Args, bool b, bool raw, typename C>
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struct field_setter<std::tuple<Args...>, b, raw, C> {
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template <bool g, std::size_t I, typename Keys, typename Value>
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void apply(std::index_sequence<I>, lua_State* L, Keys&& keys, Value&& value, int tableindex) {
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I < 1 ? set_field<g, raw>(L, std::get<I>(std::forward<Keys>(keys)), std::forward<Value>(value), tableindex)
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: set_field<g, raw>(L, std::get<I>(std::forward<Keys>(keys)), std::forward<Value>(value));
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}
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template <bool g, std::size_t I0, std::size_t I1, std::size_t... I, typename Keys, typename Value>
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void apply(std::index_sequence<I0, I1, I...>, lua_State* L, Keys&& keys, Value&& value, int tableindex) {
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I0 < 1 ? get_field<g, raw>(L, std::get<I0>(std::forward<Keys>(keys)), tableindex)
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: get_field<g, raw>(L, std::get<I0>(std::forward<Keys>(keys)), -1);
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apply<false>(std::index_sequence<I1, I...>(), L, std::forward<Keys>(keys), std::forward<Value>(value), -1);
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}
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template <bool g, std::size_t I0, std::size_t... I, typename Keys, typename Value>
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void top_apply(std::index_sequence<I0, I...>, lua_State* L, Keys&& keys, Value&& value, int tableindex) {
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apply<g>(std::index_sequence<I0, I...>(), L, std::forward<Keys>(keys), std::forward<Value>(value), tableindex);
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lua_pop(L, static_cast<int>(sizeof...(I)));
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}
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template <typename Keys, typename Value>
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void set(lua_State* L, Keys&& keys, Value&& value, int tableindex = -3) {
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top_apply<b>(std::make_index_sequence<sizeof...(Args)>(), L, std::forward<Keys>(keys), std::forward<Value>(value), tableindex);
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}
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};
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template <typename A, typename B, bool b, bool raw, typename C>
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struct field_setter<std::pair<A, B>, b, raw, C> {
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template <typename Keys, typename Value>
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void set(lua_State* L, Keys&& keys, Value&& value, int tableindex = -1) {
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get_field<b, raw>(L, std::get<0>(std::forward<Keys>(keys)), tableindex);
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set_field<false, raw>(L, std::get<1>(std::forward<Keys>(keys)), std::forward<Value>(value), lua_gettop(L));
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lua_pop(L, 1);
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}
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};
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}} // namespace sol::stack
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#endif // SOL_STACK_FIELD_HPP
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