mirror of
https://github.com/ThePhD/sol2.git
synced 2024-03-22 13:10:44 +08:00
330df79ab9
Added new examples to illustrate a few things people were wondering about HEAVILY fixed up usertypes and inheritance. Again. Sigh. One day it'll all be correct.
347 lines
11 KiB
C++
347 lines
11 KiB
C++
// The MIT License (MIT)
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// Copyright (c) 2013-2016 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_HPP
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#define SOL_STACK_CHECK_HPP
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#include "stack_core.hpp"
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#include "usertype_traits.hpp"
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#include "inheritance.hpp"
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#include <memory>
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#include <functional>
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#include <utility>
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namespace sol {
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namespace stack {
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namespace stack_detail {
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template <typename T>
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inline bool check_metatable(lua_State* L, int index = -2) {
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const auto& metakey = usertype_traits<T>::metatable;
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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::nil) {
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if (lua_rawequal(L, -1, index) == 1) {
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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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lua_pop(L, 1);
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return false;
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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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} // stack_detail
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template <typename T, type expected, typename>
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struct 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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tracking.use(1);
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const type indextype = type_of(L, index);
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bool success = expected == indextype;
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if (!success) {
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// expected type, actual type
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handler(L, index, expected, indextype);
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}
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return success;
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}
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};
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template <type expected, typename C>
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struct checker<nil_t, expected, C> {
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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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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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};
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template <type expected, typename C>
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struct checker<nullopt_t, expected, C> : checker<nil_t> {};
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template <typename C>
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struct checker<this_state, type::poly, C> {
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template <typename Handler>
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static bool check(lua_State*, int, Handler&&, record& tracking) {
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tracking.use(0);
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return true;
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}
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};
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template <typename C>
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struct checker<variadic_args, type::poly, C> {
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template <typename Handler>
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static bool check(lua_State*, int, Handler&&, record& tracking) {
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tracking.use(0);
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return true;
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}
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};
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template <typename C>
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struct checker<type, type::poly, C> {
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template <typename Handler>
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static bool check(lua_State*, int, Handler&&, record& tracking) {
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tracking.use(0);
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return true;
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}
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};
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template <typename T, typename C>
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struct checker<T, type::poly, C> {
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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 = !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::none, 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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template <typename T, typename C>
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struct checker<T, type::lightuserdata, C> {
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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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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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};
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template <typename C>
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struct checker<userdata_value, type::userdata, C> {
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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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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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};
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template <typename T, typename C>
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struct checker<user<T>, type::userdata, C> : checker<user<T>, type::lightuserdata, C> {};
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template <typename T, typename C>
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struct checker<non_null<T>, type::userdata, C> : checker<T, lua_type_of<T>::value, C> {};
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template <typename C>
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struct checker<lua_CFunction, type::function, C> : stack_detail::basic_check<type::function, lua_iscfunction> {};
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template <typename C>
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struct checker<std::remove_pointer_t<lua_CFunction>, type::function, C> : checker<lua_CFunction, type::function, C> {};
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template <typename C>
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struct checker<c_closure, type::function, C> : checker<lua_CFunction, type::function, C> {};
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template <typename T, typename C>
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struct checker<T, type::function, C> {
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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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type t = type_of(L, index);
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if (t == type::nil || t == type::none || t == type::function) {
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// allow for 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);
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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 = name_of(meta_function::call);
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lua_getmetatable(L, index);
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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);
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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);
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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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template <typename T, typename C>
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struct checker<T, type::table, C> {
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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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type t = type_of(L, index);
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if (t == type::table) {
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return true;
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}
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if (t != type::userdata) {
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handler(L, index, type::function, t);
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return false;
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}
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return true;
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}
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};
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template <typename T, typename C>
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struct checker<T*, type::userdata, C> {
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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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const type indextype = type_of(L, index);
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// Allow nil to be transformed to nullptr
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if (indextype == type::nil) {
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tracking.use(1);
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return true;
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}
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return checker<meta::unqualified_t<T>, type::userdata, C>{}.check(types<meta::unqualified_t<T>>(), L, indextype, index, std::forward<Handler>(handler), tracking);
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}
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};
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template <typename T, typename C>
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struct checker<T, type::userdata, C> {
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template <typename U, typename Handler>
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static bool check(types<U>, lua_State* L, type indextype, int index, Handler&& handler, record& tracking) {
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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);
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return false;
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}
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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)
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return true;
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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<U>(L, metatableindex))
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return true;
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if (stack_detail::check_metatable<U*>(L, metatableindex))
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return true;
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if (stack_detail::check_metatable<detail::unique_usertype<U>>(L, metatableindex))
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return true;
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bool success = false;
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if (detail::has_derived<T>::value) {
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auto pn = stack::pop_n(L, 1);
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lua_pushstring(L, &detail::base_class_check_key()[0]);
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lua_rawget(L, metatableindex);
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if (type_of(L, -1) != type::nil) {
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void* basecastdata = lua_touserdata(L, -1);
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detail::inheritance_check_function ic = (detail::inheritance_check_function)basecastdata;
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success = ic(detail::id_for<T>::value);
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}
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}
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if (!success) {
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lua_pop(L, 1);
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handler(L, index, type::userdata, indextype);
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return false;
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}
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lua_pop(L, 1);
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return true;
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}
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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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const type indextype = type_of(L, index);
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return check(types<T>(), L, indextype, index, std::forward<Handler>(handler), tracking);
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}
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};
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template<typename T>
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struct checker<T, type::userdata, std::enable_if_t<is_unique_usertype<T>::value>> {
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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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return checker<typename unique_usertype_traits<T>::type, type::userdata>{}.check(L, index, std::forward<Handler>(handler), tracking);
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}
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};
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template<typename T, typename C>
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struct checker<std::reference_wrapper<T>, type::userdata, C> {
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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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return checker<T, type::userdata, C>{}.check(L, index, std::forward<Handler>(handler), tracking);
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}
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};
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template<typename... Args, typename C>
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struct checker<std::tuple<Args...>, type::poly, C> {
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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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return stack::multi_check<Args...>(L, index, std::forward<Handler>(handler), tracking);
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}
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};
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template<typename A, typename B, typename C>
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struct checker<std::pair<A, B>, type::poly, C> {
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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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return stack::multi_check<A, B>(L, index, std::forward<Handler>(handler), tracking);
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}
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};
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template<typename T, typename C>
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struct checker<optional<T>, type::poly, C> {
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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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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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return t == type::nil || stack::check<T>(L, index, std::forward<Handler>(handler), tracking);
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}
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};
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} // stack
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} // sol
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#endif // SOL_STACK_CHECK_HPP
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