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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_CHECK_HPP
-#define SOL_STACK_CHECK_HPP
-
-#include "stack_core.hpp"
-#include "usertype_traits.hpp"
-#include "inheritance.hpp"
-#include <memory>
-#include <functional>
-#include <utility>
-
-namespace sol {
- namespace stack {
- namespace stack_detail {
- template <typename T, bool poptable = true>
- inline bool check_metatable(lua_State* L, int index = -2) {
- const auto& metakey = usertype_traits<T>::metatable();
- luaL_getmetatable(L, &metakey[0]);
- const type expectedmetatabletype = static_cast<type>(lua_type(L, -1));
- if (expectedmetatabletype != type::lua_nil) {
- if (lua_rawequal(L, -1, index) == 1) {
- lua_pop(L, 1 + static_cast<int>(poptable));
- return true;
- }
- }
- lua_pop(L, 1);
- return false;
- }
-
- template <type expected, int(*check_func)(lua_State*, int)>
- struct basic_check {
- template <typename Handler>
- static bool check(lua_State* L, int index, Handler&& handler, record& tracking) {
- tracking.use(1);
- bool success = check_func(L, index) == 1;
- if (!success) {
- // expected type, actual type
- handler(L, index, expected, type_of(L, index));
- }
- return success;
- }
- };
- } // stack_detail
-
- template <typename T, type expected, typename>
- struct checker {
- template <typename Handler>
- static bool check(lua_State* L, int index, Handler&& handler, record& tracking) {
- tracking.use(1);
- const type indextype = type_of(L, index);
- bool success = expected == indextype;
- if (!success) {
- // expected type, actual type
- handler(L, index, expected, indextype);
- }
- return success;
- }
- };
-
- template<typename T>
- struct checker<T, type::number, std::enable_if_t<std::is_integral<T>::value>> {
- template <typename Handler>
- static bool check(lua_State* L, int index, Handler&& handler, record& tracking) {
- tracking.use(1);
- bool success = lua_isinteger(L, index) == 1;
- if (!success) {
- // expected type, actual type
- handler(L, index, type::number, type_of(L, index));
- }
- return success;
- }
- };
-
- template<typename T>
- struct checker<T, type::number, std::enable_if_t<std::is_floating_point<T>::value>> {
- template <typename Handler>
- static bool check(lua_State* L, int index, Handler&& handler, record& tracking) {
- tracking.use(1);
- bool success = lua_isnumber(L, index) == 1;
- if (!success) {
- // expected type, actual type
- handler(L, index, type::number, type_of(L, index));
- }
- return success;
- }
- };
-
- template <type expected, typename C>
- struct checker<lua_nil_t, expected, C> {
- template <typename Handler>
- static bool check(lua_State* L, int index, Handler&& handler, record& tracking) {
- bool success = lua_isnil(L, index);
- if (success) {
- tracking.use(1);
- return success;
- }
- tracking.use(0);
- success = lua_isnone(L, index);
- if (!success) {
- // expected type, actual type
- handler(L, index, expected, type_of(L, index));
- }
- return success;
- }
- };
-
- template <type expected, typename C>
- struct checker<nullopt_t, expected, C> : checker<lua_nil_t> {};
-
- template <typename C>
- struct checker<this_state, type::poly, C> {
- template <typename Handler>
- static bool check(lua_State*, int, Handler&&, record& tracking) {
- tracking.use(0);
- return true;
- }
- };
-
- template <typename C>
- struct checker<variadic_args, type::poly, C> {
- template <typename Handler>
- static bool check(lua_State*, int, Handler&&, record& tracking) {
- tracking.use(0);
- return true;
- }
- };
-
- template <typename C>
- struct checker<type, type::poly, C> {
- template <typename Handler>
- static bool check(lua_State*, int, Handler&&, record& tracking) {
- tracking.use(0);
- return true;
- }
- };
-
- template <typename T, typename C>
- struct checker<T, type::poly, C> {
- template <typename Handler>
- static bool check(lua_State* L, int index, Handler&& handler, record& tracking) {
- tracking.use(1);
- bool success = !lua_isnone(L, index);
- if (!success) {
- // expected type, actual type
- handler(L, index, type::none, type_of(L, index));
- }
- return success;
- }
- };
-
- template <typename T, typename C>
- struct checker<T, type::lightuserdata, C> {
- template <typename Handler>
- static bool check(lua_State* L, int index, Handler&& handler, record& tracking) {
- tracking.use(1);
- type t = type_of(L, index);
- bool success = t == type::userdata || t == type::lightuserdata;
- if (!success) {
- // expected type, actual type
- handler(L, index, type::lightuserdata, t);
- }
- return success;
- }
- };
-
- template <typename C>
- struct checker<userdata_value, type::userdata, C> {
- template <typename Handler>
- static bool check(lua_State* L, int index, Handler&& handler, record& tracking) {
- tracking.use(1);
- type t = type_of(L, index);
- bool success = t == type::userdata;
- if (!success) {
- // expected type, actual type
- handler(L, index, type::userdata, t);
- }
- return success;
- }
- };
-
- template <typename T, typename C>
- struct checker<user<T>, type::userdata, C> : checker<user<T>, type::lightuserdata, C> {};
-
- template <typename T, typename C>
- struct checker<non_null<T>, type::userdata, C> : checker<T, lua_type_of<T>::value, C> {};
-
- template <typename C>
- struct checker<lua_CFunction, type::function, C> : stack_detail::basic_check<type::function, lua_iscfunction> {};
- template <typename C>
- struct checker<std::remove_pointer_t<lua_CFunction>, type::function, C> : checker<lua_CFunction, type::function, C> {};
- template <typename C>
- struct checker<c_closure, type::function, C> : checker<lua_CFunction, type::function, C> {};
-
- template <typename T, typename C>
- struct checker<T, type::function, C> {
- template <typename Handler>
- static bool check(lua_State* L, int index, Handler&& handler, record& tracking) {
- tracking.use(1);
- type t = type_of(L, index);
- if (t == type::lua_nil || t == type::none || t == type::function) {
- // allow for lua_nil to be returned
- return true;
- }
- if (t != type::userdata && t != type::table) {
- handler(L, index, type::function, t);
- return false;
- }
- // Do advanced check for call-style userdata?
- static const auto& callkey = name_of(meta_function::call);
- if (lua_getmetatable(L, index) == 0) {
- // No metatable, no __call key possible
- handler(L, index, type::function, t);
- return false;
- }
- if (lua_isnoneornil(L, -1)) {
- lua_pop(L, 1);
- handler(L, index, type::function, t);
- return false;
- }
- lua_getfield(L, -1, &callkey[0]);
- if (lua_isnoneornil(L, -1)) {
- lua_pop(L, 2);
- handler(L, index, type::function, t);
- return false;
- }
- // has call, is definitely a function
- lua_pop(L, 2);
- return true;
- }
- };
-
- template <typename T, typename C>
- struct checker<T, type::table, C> {
- template <typename Handler>
- static bool check(lua_State* L, int index, Handler&& handler, record& tracking) {
- tracking.use(1);
- type t = type_of(L, index);
- if (t == type::table) {
- return true;
- }
- if (t != type::userdata) {
- handler(L, index, type::function, t);
- return false;
- }
- return true;
- }
- };
-
- template <typename T, typename C>
- struct checker<detail::as_value_tag<T>, type::userdata, C> {
- template <typename U, typename Handler>
- static bool check(types<U>, lua_State* L, type indextype, int index, Handler&& handler, record& tracking) {
- tracking.use(1);
- if (indextype != type::userdata) {
- handler(L, index, type::userdata, indextype);
- return false;
- }
- if (meta::any<std::is_same<T, lightuserdata_value>, std::is_same<T, userdata_value>, std::is_same<T, userdata>, std::is_same<T, lightuserdata>>::value)
- return true;
- 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<detail::unique_usertype<U>>(L, metatableindex))
- return true;
- bool success = false;
- if (detail::has_derived<T>::value) {
- 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 = (detail::inheritance_check_function)basecastdata;
- success = ic(detail::id_for<T>::value);
- }
- }
- if (!success) {
- lua_pop(L, 1);
- handler(L, index, type::userdata, indextype);
- return false;
- }
- lua_pop(L, 1);
- return true;
- }
- };
-
- template <typename T, typename C>
- struct checker<T, type::userdata, C> {
- template <typename Handler>
- static bool check(lua_State* L, int index, Handler&& handler, record& tracking) {
- const type indextype = type_of(L, index);
- return checker<detail::as_value_tag<T>, type::userdata, C>{}.check(types<T>(), L, indextype, index, std::forward<Handler>(handler), tracking);
- }
- };
-
- template <typename T, typename C>
- struct checker<T*, type::userdata, C> {
- template <typename Handler>
- static bool check(lua_State* L, int index, Handler&& handler, record& tracking) {
- const type indextype = type_of(L, index);
- // Allow lua_nil to be transformed to nullptr
- if (indextype == type::lua_nil) {
- tracking.use(1);
- return true;
- }
- return checker<meta::unqualified_t<T>, type::userdata, C>{}.check(L, index, std::forward<Handler>(handler), tracking);
- }
- };
-
- template<typename T>
- struct checker<T, type::userdata, std::enable_if_t<is_unique_usertype<T>::value>> {
- template <typename Handler>
- static bool check(lua_State* L, int index, Handler&& handler, record& tracking) {
- return checker<typename unique_usertype_traits<T>::type, type::userdata>{}.check(L, index, std::forward<Handler>(handler), tracking);
- }
- };
-
- template<typename T, typename C>
- struct checker<std::reference_wrapper<T>, type::userdata, C> {
- template <typename Handler>
- static bool check(lua_State* L, int index, Handler&& handler, record& tracking) {
- return checker<T, type::userdata, C>{}.check(L, index, std::forward<Handler>(handler), tracking);
- }
- };
-
- template<typename... Args, typename C>
- struct checker<std::tuple<Args...>, type::poly, C> {
- 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, typename C>
- struct checker<std::pair<A, B>, type::poly, C> {
- 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);
- }
- };
-
- template<typename T, typename C>
- struct checker<optional<T>, type::poly, C> {
- template <typename Handler>
- static bool check(lua_State* L, int index, Handler&&, record& tracking) {
- type t = type_of(L, index);
- if (t == type::none) {
- tracking.use(0);
- return true;
- }
- if (t == type::lua_nil) {
- tracking.use(1);
- return true;
- }
- return stack::check<T>(L, index, no_panic, tracking);
- }
- };
- } // stack
-} // sol
-
-#endif // SOL_STACK_CHECK_HPP