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// sol3
// The MIT License (MIT)
// Copyright (c) 2013-2019 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_PROTECTED_HANDLER_HPP
#define SOL_PROTECTED_HANDLER_HPP
#include "reference.hpp"
#include "stack.hpp"
#include "protected_function_result.hpp"
#include "unsafe_function.hpp"
#include <cstdint>
namespace sol {
namespace detail {
inline const char(&default_handler_name())[9]{
static const char name[9] = "sol.\xF0\x9F\x94\xA9";
return name;
}
template <bool b, typename target_t = reference>
struct protected_handler {
typedef is_stack_based<target_t> is_stack;
const target_t& target;
int stackindex;
protected_handler(std::false_type, const target_t& target)
: target(target), stackindex(0) {
if (b) {
stackindex = lua_gettop(target.lua_state()) + 1;
target.push();
}
}
protected_handler(std::true_type, const target_t& target)
: target(target), stackindex(0) {
if (b) {
stackindex = target.stack_index();
}
}
protected_handler(const target_t& target)
: protected_handler(is_stack(), target) {
}
bool valid() const noexcept {
return b;
}
~protected_handler() {
if constexpr (!is_stack::value) {
if (stackindex != 0) {
lua_remove(target.lua_state(), stackindex);
}
}
}
};
template <typename base_t, typename T>
basic_function<base_t> force_cast(T& p) {
return p;
}
template <typename Reference, bool is_main_ref = false>
static Reference get_default_handler(lua_State* L) {
if (is_stack_based<Reference>::value || L == nullptr)
return Reference(L, lua_nil);
L = is_main_ref ? main_thread(L, L) : L;
lua_getglobal(L, default_handler_name());
auto pp = stack::pop_n(L, 1);
return Reference(L, -1);
}
template <typename T>
static void set_default_handler(lua_State* L, const T& ref) {
if (L == nullptr) {
return;
}
if (!ref.valid()) {
#if defined(SOL_SAFE_STACK_CHECK) && SOL_SAFE_STACK_CHECK
luaL_checkstack(L, 1, detail::not_enough_stack_space_generic);
#endif // make sure stack doesn't overflow
lua_pushnil(L);
lua_setglobal(L, default_handler_name());
}
else {
ref.push(L);
lua_setglobal(L, default_handler_name());
}
}
} // namespace detail
} // namespace sol
#endif // SOL_PROTECTED_HANDLER_HPP
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