mirror of
https://github.com/ThePhD/sol2.git
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57d9a05f88
- 🛠 Make sure the tutorials compile across platforms! - ✍ Redo quite a bit of the documentation
629 lines
22 KiB
C++
629 lines
22 KiB
C++
// sol2
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// The MIT License (MIT)
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// Copyright (c) 2013-2021 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_CHECK_UNQUALIFIED_HPP
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#define SOL_STACK_CHECK_UNQUALIFIED_HPP
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#include <sol/stack_core.hpp>
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#include <sol/usertype_traits.hpp>
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#include <sol/inheritance.hpp>
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#include <memory>
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#include <functional>
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#include <utility>
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#include <cmath>
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#include <optional>
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#if SOL_IS_ON(SOL_STD_VARIANT_I_)
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#include <variant>
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#endif // variant shenanigans
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namespace sol { namespace stack {
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namespace stack_detail {
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inline bool impl_check_metatable(lua_State* L, int index, const std::string& metakey, bool poptable) {
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luaL_getmetatable(L, &metakey[0]);
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const type expectedmetatabletype = static_cast<type>(lua_type(L, -1));
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if (expectedmetatabletype != type::lua_nil) {
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if (lua_rawequal(L, -1, index) == 1) {
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lua_pop(L, 1 + static_cast<int>(poptable));
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return true;
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}
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}
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lua_pop(L, 1);
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return false;
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}
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template <typename T, bool poptable = true>
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inline bool check_metatable(lua_State* L, int index = -2) {
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return impl_check_metatable(L, index, usertype_traits<T>::metatable(), poptable);
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}
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template <type expected, int (*check_func)(lua_State*, int)>
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struct basic_check {
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template <typename Handler>
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static bool check(lua_State* L, int index, Handler&& handler, record& tracking) {
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tracking.use(1);
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bool success = check_func(L, index) == 1;
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if (!success) {
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// expected type, actual type
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handler(L, index, expected, type_of(L, index), "");
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}
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return success;
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}
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};
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} // namespace stack_detail
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template <typename T, typename>
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struct unqualified_interop_checker {
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template <typename Handler>
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static bool check(lua_State*, int, type, Handler&&, record&) {
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return false;
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}
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};
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template <typename T, typename>
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struct qualified_interop_checker {
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template <typename Handler>
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static bool check(lua_State* L, int index, type index_type, Handler&& handler, record& tracking) {
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return stack_detail::unqualified_interop_check<T>(L, index, index_type, std::forward<Handler>(handler), tracking);
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}
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};
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template <typename T, type expected, typename>
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struct unqualified_checker {
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template <typename Handler>
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static bool check(lua_State* L, int index, Handler&& handler, record& tracking) {
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if constexpr (std::is_same_v<T, bool>) {
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tracking.use(1);
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bool success = lua_isboolean(L, index) == 1;
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if (!success) {
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// expected type, actual type
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handler(L, index, expected, type_of(L, index), "");
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}
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return success;
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}
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else if constexpr (meta::any_same_v<T,
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char
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#if SOL_IS_ON(SOL_CHAR8_T_I_)
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,
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char8_t
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#endif
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,
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char16_t,
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char32_t>) {
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return stack::check<std::basic_string<T>>(L, index, std::forward<Handler>(handler), tracking);
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}
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else if constexpr (std::is_integral_v<T> || std::is_same_v<T, lua_Integer>) {
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tracking.use(1);
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#if SOL_LUA_VESION_I_ >= 503
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// Lua 5.3 and greater checks for numeric precision
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#if SOL_IS_ON(SOL_STRINGS_ARE_NUMBERS_I_)
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// imprecise, sloppy conversions
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int isnum = 0;
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lua_tointegerx(L, index, &isnum);
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const bool success = isnum != 0;
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if (!success) {
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// expected type, actual type
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handler(L, index, type::number, type_of(L, index), detail::not_a_number_or_number_string_integral);
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}
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#elif SOL_IS_ON(SOL_NUMBER_PRECISION_CHECKS_I_)
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// this check is precise, do not convert
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if (lua_isinteger(L, index) == 1) {
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return true;
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}
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const bool success = false;
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if (!success) {
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// expected type, actual type
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handler(L, index, type::number, type_of(L, index), detail::not_a_number_integral);
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}
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#else
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// Numerics are neither safe nor string-convertible
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type t = type_of(L, index);
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const bool success = t == type::number;
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#endif
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if (!success) {
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// expected type, actual type
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handler(L, index, type::number, type_of(L, index), detail::not_a_number);
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}
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return success;
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#else
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// Lua 5.2 and below checks
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#if SOL_IS_OFF(SOL_STRINGS_ARE_NUMBERS_I_)
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// must pre-check, because it will convert
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type t = type_of(L, index);
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if (t != type::number) {
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// expected type, actual type
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handler(L, index, type::number, t, detail::not_a_number);
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return false;
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}
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#endif // Do not allow strings to be numbers
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#if SOL_IS_ON(SOL_NUMBER_PRECISION_CHECKS_I_)
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int isnum = 0;
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const lua_Number v = lua_tonumberx(L, index, &isnum);
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const bool success = isnum != 0 && static_cast<lua_Number>(llround(v)) == v;
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#else
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const bool success = true;
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#endif // Safe numerics and number precision checking
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if (!success) {
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// Use defines to provide a better error message!
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#if SOL_IS_ON(SOL_STRINGS_ARE_NUMBERS_I_)
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handler(L, index, type::number, type_of(L, index), detail::not_a_number_or_number_string);
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#elif SOL_IS_ON(SOL_NUMBER_PRECISION_CHECKS_I_)
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handler(L, index, type::number, t, detail::not_a_number_or_number_string);
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#else
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handler(L, index, type::number, t, detail::not_a_number);
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#endif
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}
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return success;
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#endif
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}
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else if constexpr (std::is_floating_point_v<T> || std::is_same_v<T, lua_Number>) {
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tracking.use(1);
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#if SOL_IS_ON(SOL_STRINGS_ARE_NUMBERS_I_)
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bool success = lua_isnumber(L, index) == 1;
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if (!success) {
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// expected type, actual type
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handler(L, index, type::number, type_of(L, index), detail::not_a_number_or_number_string);
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}
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return success;
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#else
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type t = type_of(L, index);
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bool success = t == type::number;
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if (!success) {
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// expected type, actual type
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handler(L, index, type::number, t, detail::not_a_number);
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}
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return success;
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#endif // Strings are Numbers
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}
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else if constexpr (meta::any_same_v<T, type, this_state, this_main_state, this_environment, variadic_args>) {
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(void)L;
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(void)index;
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(void)handler;
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tracking.use(0);
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return true;
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}
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else if constexpr (is_unique_usertype_v<T>) {
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using element = unique_usertype_element_t<T>;
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using actual = unique_usertype_actual_t<T>;
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const type indextype = type_of(L, index);
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tracking.use(1);
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if (indextype != type::userdata) {
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handler(L, index, type::userdata, indextype, "value is not a userdata");
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return false;
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}
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if (lua_getmetatable(L, index) == 0) {
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return true;
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}
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int metatableindex = lua_gettop(L);
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if (stack_detail::check_metatable<d::u<element>>(L, metatableindex)) {
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void* memory = lua_touserdata(L, index);
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memory = detail::align_usertype_unique_destructor(memory);
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detail::unique_destructor& pdx = *static_cast<detail::unique_destructor*>(memory);
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bool success = &detail::usertype_unique_alloc_destroy<element, actual> == pdx;
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if (!success) {
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memory = detail::align_usertype_unique_tag<true>(memory);
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#if 0
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// New version, one day
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#else
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const char*& name_tag = *static_cast<const char**>(memory);
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success = usertype_traits<T>::qualified_name() == name_tag;
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#endif
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if (!success) {
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handler(L, index, type::userdata, indextype, "value is a userdata but is not the correct unique usertype");
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}
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}
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return success;
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}
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lua_pop(L, 1);
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handler(L, index, type::userdata, indextype, "unrecognized userdata (not pushed by sol?)");
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return false;
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}
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else if constexpr (meta::any_same_v<T, lua_nil_t, std::nullopt_t, nullopt_t>) {
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bool success = lua_isnil(L, index);
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if (success) {
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tracking.use(1);
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return success;
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}
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tracking.use(0);
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success = lua_isnone(L, index);
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if (!success) {
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// expected type, actual type
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handler(L, index, expected, type_of(L, index), "");
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}
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return success;
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}
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else if constexpr (std::is_same_v<T, env_key_t>) {
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tracking.use(1);
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type t = type_of(L, index);
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if (t == type::table || t == type::none || t == type::lua_nil || t == type::userdata) {
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return true;
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}
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handler(L, index, type::table, t, "value cannot not have a valid environment");
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return true;
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}
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else if constexpr (std::is_same_v<T, detail::non_lua_nil_t>) {
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return !stack::unqualified_check<lua_nil_t>(L, index, std::forward<Handler>(handler), tracking);
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}
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else if constexpr (meta::is_specialization_of_v<T, basic_lua_table>) {
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tracking.use(1);
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type t = type_of(L, index);
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if (t != type::table) {
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handler(L, index, type::table, t, "value is not a table");
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return false;
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}
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return true;
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}
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else if constexpr (meta::is_specialization_of_v<T, basic_bytecode>) {
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tracking.use(1);
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type t = type_of(L, index);
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if (t != type::function) {
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handler(L, index, type::function, t, "value is not a function that can be dumped");
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return false;
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}
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return true;
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}
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else if constexpr (meta::is_specialization_of_v<T, basic_environment>) {
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tracking.use(1);
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if (lua_getmetatable(L, index) == 0) {
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return true;
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}
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type t = type_of(L, -1);
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if (t == type::table || t == type::none || t == type::lua_nil) {
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lua_pop(L, 1);
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return true;
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}
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if (t != type::userdata) {
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lua_pop(L, 1);
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handler(L, index, type::table, t, "value does not have a valid metatable");
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return false;
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}
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return true;
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}
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else if constexpr (std::is_same_v<T, metatable_key_t>) {
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tracking.use(1);
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if (lua_getmetatable(L, index) == 0) {
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return true;
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}
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type t = type_of(L, -1);
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if (t == type::table || t == type::none || t == type::lua_nil) {
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lua_pop(L, 1);
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return true;
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}
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if (t != type::userdata) {
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lua_pop(L, 1);
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handler(L, index, expected, t, "value does not have a valid metatable");
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return false;
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}
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return true;
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}
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else if constexpr (std::is_same_v<T, luaL_Stream*> || std::is_same_v<T, luaL_Stream>) {
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if (lua_getmetatable(L, index) == 0) {
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type t = type_of(L, index);
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handler(L, index, expected, t, "value is not a valid luaL_Stream (has no metatable/is not a valid value)");
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return false;
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}
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luaL_getmetatable(L, LUA_FILEHANDLE);
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if (type_of(L, index) != type::table) {
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type t = type_of(L, index);
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lua_pop(L, 1);
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handler(L,
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index,
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expected,
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t,
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"value is not a valid luaL_Stream (there is no metatable for luaL_Stream -- did you forget to "
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"my_lua_state.open_libraries(sol::lib::state) or equivalent?)");
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return false;
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}
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int is_stream_table = lua_compare(L, -1, -2, LUA_OPEQ);
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lua_pop(L, 2);
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if (is_stream_table == 0) {
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type t = type_of(L, index);
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handler(L, index, expected, t, "value is not a valid luaL_Stream (incorrect metatable)");
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return false;
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}
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return true;
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}
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else if constexpr (meta::is_optional_v<T>) {
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using ValueType = typename T::value_type;
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(void)handler;
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type t = type_of(L, index);
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if (t == type::none) {
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tracking.use(0);
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return true;
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}
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if (t == type::lua_nil) {
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tracking.use(1);
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return true;
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}
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return stack::unqualified_check<ValueType>(L, index, &no_panic, tracking);
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}
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#if SOL_IS_ON(SOL_GET_FUNCTION_POINTER_UNSAFE_I_)
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else if constexpr (std::is_function_v<T> || (std::is_pointer_v<T> && std::is_function_v<std::remove_pointer_t<T>>)) {
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return stack_detail::check_function_pointer<std::remove_pointer_t<T>>(L, index, std::forward<Handler>(handler), tracking);
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}
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#endif
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else if constexpr (expected == type::userdata) {
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if constexpr (meta::any_same_v<T, userdata_value> || meta::is_specialization_of_v<T, basic_userdata>) {
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tracking.use(1);
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type t = type_of(L, index);
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bool success = t == type::userdata;
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if (!success) {
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// expected type, actual type
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handler(L, index, type::userdata, t, "");
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}
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return success;
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}
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else if constexpr (meta::is_specialization_of_v<T, user>) {
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unqualified_checker<lightuserdata_value, type::userdata> c;
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(void)c;
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return c.check(L, index, std::forward<Handler>(handler), tracking);
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}
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else {
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if constexpr (std::is_pointer_v<T>) {
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return check_usertype<T>(L, index, std::forward<Handler>(handler), tracking);
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}
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else if constexpr (meta::is_specialization_of_v<T, std::reference_wrapper>) {
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using T_internal = typename T::type;
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return stack::check<T_internal>(L, index, std::forward<Handler>(handler), tracking);
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}
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else {
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return check_usertype<T>(L, index, std::forward<Handler>(handler), tracking);
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}
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}
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}
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else if constexpr (expected == type::poly) {
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tracking.use(1);
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bool success = is_lua_reference_v<T> || !lua_isnone(L, index);
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if (!success) {
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// expected type, actual type
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handler(L, index, type::poly, type_of(L, index), "");
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}
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return success;
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}
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else if constexpr (expected == type::lightuserdata) {
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tracking.use(1);
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type t = type_of(L, index);
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bool success = t == type::userdata || t == type::lightuserdata;
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if (!success) {
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// expected type, actual type
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handler(L, index, type::lightuserdata, t, "");
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}
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return success;
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}
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else if constexpr (expected == type::function) {
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if constexpr (meta::any_same_v<T, lua_CFunction, std::remove_pointer_t<lua_CFunction>, c_closure>) {
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tracking.use(1);
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bool success = lua_iscfunction(L, index) == 1;
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if (!success) {
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// expected type, actual type
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handler(L, index, expected, type_of(L, index), "");
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}
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return success;
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}
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else {
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tracking.use(1);
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type t = type_of(L, index);
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if (t == type::lua_nil || t == type::none || t == type::function) {
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// allow for lua_nil to be returned
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return true;
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}
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if (t != type::userdata && t != type::table) {
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handler(L, index, type::function, t, "must be a function or table or a userdata");
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return false;
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}
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// Do advanced check for call-style userdata?
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static const auto& callkey = to_string(meta_function::call);
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if (lua_getmetatable(L, index) == 0) {
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// No metatable, no __call key possible
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handler(L, index, type::function, t, "value is not a function and does not have overriden metatable");
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return false;
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}
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if (lua_isnoneornil(L, -1)) {
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lua_pop(L, 1);
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handler(L, index, type::function, t, "value is not a function and does not have valid metatable");
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return false;
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}
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lua_getfield(L, -1, &callkey[0]);
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if (lua_isnoneornil(L, -1)) {
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lua_pop(L, 2);
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handler(L, index, type::function, t, "value's metatable does not have __call overridden in metatable, cannot call this type");
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return false;
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}
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// has call, is definitely a function
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lua_pop(L, 2);
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return true;
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}
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}
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else if constexpr (expected == type::table) {
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tracking.use(1);
|
|
type t = type_of(L, index);
|
|
if (t == type::table) {
|
|
return true;
|
|
}
|
|
if (t != type::userdata) {
|
|
handler(L, index, type::table, t, "value is not a table or a userdata that can behave like one");
|
|
return false;
|
|
}
|
|
return true;
|
|
}
|
|
else {
|
|
tracking.use(1);
|
|
const type indextype = type_of(L, index);
|
|
bool success = expected == indextype;
|
|
if (!success) {
|
|
// expected type, actual type, message
|
|
handler(L, index, expected, indextype, "");
|
|
}
|
|
return success;
|
|
}
|
|
}
|
|
};
|
|
|
|
template <typename T>
|
|
struct unqualified_checker<non_null<T>, type::userdata> : unqualified_checker<T, lua_type_of_v<T>> { };
|
|
|
|
template <typename T>
|
|
struct unqualified_checker<detail::as_value_tag<T>, type::userdata> {
|
|
template <typename Handler>
|
|
static bool check(lua_State* L, int index, Handler&& handler, record& tracking) {
|
|
const type indextype = type_of(L, index);
|
|
return check(types<T>(), L, index, indextype, std::forward<Handler>(handler), tracking);
|
|
}
|
|
|
|
template <typename U, typename Handler>
|
|
static bool check(types<U>, lua_State* L, int index, type indextype, Handler&& handler, record& tracking) {
|
|
if constexpr (
|
|
std::is_same_v<T,
|
|
lightuserdata_value> || std::is_same_v<T, userdata_value> || std::is_same_v<T, userdata> || std::is_same_v<T, lightuserdata>) {
|
|
tracking.use(1);
|
|
if (indextype != type::userdata) {
|
|
handler(L, index, type::userdata, indextype, "value is not a valid userdata");
|
|
return false;
|
|
}
|
|
return true;
|
|
}
|
|
else {
|
|
#if SOL_IS_ON(SOL_USE_INTEROP_I_)
|
|
if (stack_detail::interop_check<U>(L, index, indextype, handler, tracking)) {
|
|
return true;
|
|
}
|
|
#endif // interop extensibility
|
|
tracking.use(1);
|
|
if (indextype != type::userdata) {
|
|
handler(L, index, type::userdata, indextype, "value is not a valid userdata");
|
|
return false;
|
|
}
|
|
if (lua_getmetatable(L, index) == 0) {
|
|
return true;
|
|
}
|
|
int metatableindex = lua_gettop(L);
|
|
if (stack_detail::check_metatable<U>(L, metatableindex))
|
|
return true;
|
|
if (stack_detail::check_metatable<U*>(L, metatableindex))
|
|
return true;
|
|
if (stack_detail::check_metatable<d::u<U>>(L, metatableindex))
|
|
return true;
|
|
if (stack_detail::check_metatable<as_container_t<U>>(L, metatableindex))
|
|
return true;
|
|
bool success = false;
|
|
bool has_derived = derive<T>::value || weak_derive<T>::value;
|
|
if (has_derived) {
|
|
#if SOL_IS_ON(SOL_SAFE_STACK_CHECK_I_)
|
|
luaL_checkstack(L, 1, detail::not_enough_stack_space_string);
|
|
#endif // make sure stack doesn't overflow
|
|
auto pn = stack::pop_n(L, 1);
|
|
lua_pushstring(L, &detail::base_class_check_key()[0]);
|
|
lua_rawget(L, metatableindex);
|
|
if (type_of(L, -1) != type::lua_nil) {
|
|
void* basecastdata = lua_touserdata(L, -1);
|
|
detail::inheritance_check_function ic = reinterpret_cast<detail::inheritance_check_function>(basecastdata);
|
|
success = ic(usertype_traits<T>::qualified_name());
|
|
}
|
|
}
|
|
lua_pop(L, 1);
|
|
if (!success) {
|
|
handler(L, index, type::userdata, indextype, "value at this index does not properly reflect the desired type");
|
|
return false;
|
|
}
|
|
return true;
|
|
}
|
|
}
|
|
};
|
|
|
|
template <typename T>
|
|
struct unqualified_checker<detail::as_pointer_tag<T>, type::userdata> {
|
|
template <typename Handler>
|
|
static bool check(lua_State* L, int index, type indextype, Handler&& handler, record& tracking) {
|
|
if (indextype == type::lua_nil) {
|
|
tracking.use(1);
|
|
return true;
|
|
}
|
|
return check_usertype<std::remove_pointer_t<T>>(L, index, std::forward<Handler>(handler), tracking);
|
|
}
|
|
|
|
template <typename Handler>
|
|
static bool check(lua_State* L, int index, Handler&& handler, record& tracking) {
|
|
const type indextype = type_of(L, index);
|
|
return check(L, index, indextype, std::forward<Handler>(handler), tracking);
|
|
}
|
|
};
|
|
|
|
template <typename... Args>
|
|
struct unqualified_checker<std::tuple<Args...>, type::poly> {
|
|
template <typename Handler>
|
|
static bool check(lua_State* L, int index, Handler&& handler, record& tracking) {
|
|
return stack::multi_check<Args...>(L, index, std::forward<Handler>(handler), tracking);
|
|
}
|
|
};
|
|
|
|
template <typename A, typename B>
|
|
struct unqualified_checker<std::pair<A, B>, type::poly> {
|
|
template <typename Handler>
|
|
static bool check(lua_State* L, int index, Handler&& handler, record& tracking) {
|
|
return stack::multi_check<A, B>(L, index, std::forward<Handler>(handler), tracking);
|
|
}
|
|
};
|
|
|
|
#if SOL_IS_ON(SOL_STD_VARIANT_I_)
|
|
|
|
template <typename... Tn>
|
|
struct unqualified_checker<std::variant<Tn...>, type::poly> {
|
|
typedef std::variant<Tn...> V;
|
|
typedef std::variant_size<V> V_size;
|
|
typedef std::integral_constant<bool, V_size::value == 0> V_is_empty;
|
|
|
|
template <typename Handler>
|
|
static bool is_one(std::integral_constant<std::size_t, 0>, lua_State* L, int index, Handler&& handler, record& tracking) {
|
|
if constexpr (V_is_empty::value) {
|
|
if (lua_isnone(L, index)) {
|
|
return true;
|
|
}
|
|
}
|
|
tracking.use(1);
|
|
handler(L, index, type::poly, type_of(L, index), "value does not fit any type present in the variant");
|
|
return false;
|
|
}
|
|
|
|
template <std::size_t I, typename Handler>
|
|
static bool is_one(std::integral_constant<std::size_t, I>, lua_State* L, int index, Handler&& handler, record& tracking) {
|
|
typedef std::variant_alternative_t<I - 1, V> T;
|
|
record temp_tracking = tracking;
|
|
if (stack::check<T>(L, index, &no_panic, temp_tracking)) {
|
|
tracking = temp_tracking;
|
|
return true;
|
|
}
|
|
return is_one(std::integral_constant<std::size_t, I - 1>(), L, index, std::forward<Handler>(handler), tracking);
|
|
}
|
|
|
|
template <typename Handler>
|
|
static bool check(lua_State* L, int index, Handler&& handler, record& tracking) {
|
|
return is_one(std::integral_constant<std::size_t, V_size::value>(), L, index, std::forward<Handler>(handler), tracking);
|
|
}
|
|
};
|
|
|
|
#endif // variant shenanigans
|
|
|
|
}} // namespace sol::stack
|
|
|
|
#endif // SOL_STACK_CHECK_UNQUALIFIED_HPP
|