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108 lines
3.3 KiB
C++
108 lines
3.3 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_PROTECTED_HANDLER_HPP
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#define SOL_PROTECTED_HANDLER_HPP
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#include <sol/reference.hpp>
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#include <sol/stack.hpp>
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#include <sol/protected_function_result.hpp>
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#include <sol/unsafe_function.hpp>
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#include <cstdint>
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namespace sol { namespace detail {
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inline const char (&default_handler_name())[9] {
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static const char name[9] = "sol.\xF0\x9F\x94\xA9";
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return name;
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}
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template <bool ShouldPush, typename Target = reference>
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struct protected_handler {
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lua_State* m_L;
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const Target& target;
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int stack_index;
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protected_handler(std::false_type, lua_State* L_, const Target& target_) : m_L(L_), target(target_), stack_index(0) {
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if (ShouldPush) {
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stack_index = lua_gettop(L_) + 1;
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target.push(L_);
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}
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}
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protected_handler(std::true_type, lua_State* L_, const Target& target_) : m_L(L_), target(target_), stack_index(0) {
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if (ShouldPush) {
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stack_index = target.stack_index();
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}
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}
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protected_handler(lua_State* L_, const Target& target_) : protected_handler(meta::boolean<is_stack_based_v<Target>>(), L_, target_) {
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}
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bool valid() const noexcept {
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return ShouldPush;
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}
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~protected_handler() {
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if constexpr (!is_stack_based_v<Target>) {
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if (stack_index != 0) {
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lua_remove(m_L, stack_index);
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}
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}
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}
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};
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template <typename Base, typename T>
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inline basic_function<Base> force_cast(T& p) {
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return p;
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}
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template <typename Reference, bool IsMainReference = false>
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inline Reference get_default_handler(lua_State* L_) {
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if (is_stack_based_v<Reference> || L_ == nullptr)
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return Reference(L_, lua_nil);
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L_ = IsMainReference ? main_thread(L_, L_) : L_;
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lua_getglobal(L_, default_handler_name());
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auto pp = stack::pop_n(L_, 1);
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return Reference(L_, -1);
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}
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template <typename T>
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inline void set_default_handler(lua_State* L, const T& ref) {
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if (L == nullptr) {
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return;
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}
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if (!ref.valid()) {
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#if SOL_IS_ON(SOL_SAFE_STACK_CHECK_I_)
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luaL_checkstack(L, 1, detail::not_enough_stack_space_generic);
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#endif // make sure stack doesn't overflow
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lua_pushnil(L);
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lua_setglobal(L, default_handler_name());
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}
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else {
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ref.push(L);
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lua_setglobal(L, default_handler_name());
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}
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}
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}} // namespace sol::detail
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#endif // SOL_PROTECTED_HANDLER_HPP
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