mirror of
https://github.com/ThePhD/sol2.git
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191 lines
7.6 KiB
C++
191 lines
7.6 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_PROTECTED_FUNCTION_HPP
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#define SOL_PROTECTED_FUNCTION_HPP
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#include "reference.hpp"
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#include "stack.hpp"
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#include "protected_function_result.hpp"
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#include <cstdint>
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#include <algorithm>
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namespace sol {
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namespace detail {
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inline reference& handler_storage() {
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static sol::reference h;
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return h;
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}
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}
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template <typename base_t>
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class basic_protected_function : public base_t {
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public:
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static reference& get_default_handler() {
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return detail::handler_storage();
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}
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static void set_default_handler(const reference& ref) {
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detail::handler_storage() = ref;
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}
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static void set_default_handler(reference&& ref) {
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detail::handler_storage() = std::move(ref);
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}
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private:
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struct handler {
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const reference& target;
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int stackindex;
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handler(const reference& target) : target(target), stackindex(0) {
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if (target.valid()) {
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stackindex = lua_gettop(target.lua_state()) + 1;
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target.push();
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}
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}
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bool valid() const { return stackindex > 0; }
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~handler() {
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if (valid()) {
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lua_remove(target.lua_state(), stackindex);
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}
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}
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};
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call_status luacall(std::ptrdiff_t argcount, std::ptrdiff_t resultcount, handler& h) const {
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return static_cast<call_status>(lua_pcallk(base_t::lua_state(), static_cast<int>(argcount), static_cast<int>(resultcount), h.stackindex, 0, nullptr));
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}
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template<std::size_t... I, typename... Ret>
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auto invoke(types<Ret...>, std::index_sequence<I...>, std::ptrdiff_t n, handler& h) const {
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luacall(n, sizeof...(Ret), h);
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return stack::pop<std::tuple<Ret...>>(base_t::lua_state());
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}
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template<std::size_t I, typename Ret>
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Ret invoke(types<Ret>, std::index_sequence<I>, std::ptrdiff_t n, handler& h) const {
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luacall(n, 1, h);
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return stack::pop<Ret>(base_t::lua_state());
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}
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template <std::size_t I>
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void invoke(types<void>, std::index_sequence<I>, std::ptrdiff_t n, handler& h) const {
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luacall(n, 0, h);
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}
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protected_function_result invoke(types<>, std::index_sequence<>, std::ptrdiff_t n, handler& h) const {
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int stacksize = lua_gettop(base_t::lua_state());
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int poststacksize = stacksize;
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int firstreturn = 1;
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int returncount = 0;
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call_status code = call_status::ok;
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#ifndef SOL_NO_EXCEPTIONS
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auto onexcept = [&](const char* error) {
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h.stackindex = 0;
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if (h.target.valid()) {
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h.target.push();
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stack::push(base_t::lua_state(), error);
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lua_call(base_t::lua_state(), 1, 1);
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}
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else {
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stack::push(base_t::lua_state(), error);
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}
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};
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try {
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#endif // No Exceptions
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code = luacall(n, LUA_MULTRET, h);
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poststacksize = lua_gettop(base_t::lua_state());
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returncount = poststacksize - (stacksize - 1);
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firstreturn = (std::max)(1, poststacksize - (returncount - 1) - static_cast<int>(h.valid()));
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#ifndef SOL_NO_EXCEPTIONS
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}
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// Handle C++ errors thrown from C++ functions bound inside of lua
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catch (const char* error) {
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onexcept(error);
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firstreturn = lua_gettop(base_t::lua_state());
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return protected_function_result(base_t::lua_state(), firstreturn, 0, 1, call_status::runtime);
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}
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catch (const std::exception& error) {
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onexcept(error.what());
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firstreturn = lua_gettop(base_t::lua_state());
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return protected_function_result(base_t::lua_state(), firstreturn, 0, 1, call_status::runtime);
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}
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catch (...) {
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onexcept("caught (...) unknown error during protected_function call");
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firstreturn = lua_gettop(base_t::lua_state());
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return protected_function_result(base_t::lua_state(), firstreturn, 0, 1, call_status::runtime);
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}
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#endif // No Exceptions
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return protected_function_result(base_t::lua_state(), firstreturn, returncount, returncount, code);
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}
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public:
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reference error_handler;
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basic_protected_function() = default;
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template <typename T, meta::enable<meta::neg<std::is_same<meta::unqualified_t<T>, basic_protected_function>>, meta::neg<std::is_same<base_t, stack_reference>>, std::is_base_of<base_t, meta::unqualified_t<T>>> = meta::enabler>
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basic_protected_function(T&& r) noexcept : base_t(std::forward<T>(r)) {
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#ifdef SOL_CHECK_ARGUMENTS
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if (!is_function<meta::unqualified_t<T>>::value) {
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auto pp = stack::push_pop(*this);
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stack::check<basic_protected_function>(base_t::lua_state(), -1, type_panic);
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}
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#endif // Safety
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}
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basic_protected_function(const basic_protected_function&) = default;
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basic_protected_function& operator=(const basic_protected_function&) = default;
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basic_protected_function(basic_protected_function&&) = default;
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basic_protected_function& operator=(basic_protected_function&&) = default;
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basic_protected_function(const basic_function<base_t>& b, reference eh = get_default_handler()) : base_t(b), error_handler(std::move(eh)) {}
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basic_protected_function(basic_function<base_t>&& b, reference eh = get_default_handler()) : base_t(std::move(b)), error_handler(std::move(eh)) {}
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basic_protected_function(const stack_reference& r, reference eh = get_default_handler()) : basic_protected_function(r.lua_state(), r.stack_index(), std::move(eh)) {}
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basic_protected_function(stack_reference&& r, reference eh = get_default_handler()) : basic_protected_function(r.lua_state(), r.stack_index(), std::move(eh)) {}
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template <typename Super>
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basic_protected_function(proxy_base<Super>&& p, reference eh = get_default_handler()) : basic_protected_function(p.operator basic_function<base_t>(), std::move(eh)) {}
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template <typename Super>
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basic_protected_function(const proxy_base<Super>& p, reference eh = get_default_handler()) : basic_protected_function(static_cast<basic_function<base_t>>(p), std::move(eh)) {}
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basic_protected_function(lua_State* L, int index = -1, reference eh = get_default_handler()) : base_t(L, index), error_handler(std::move(eh)) {
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#ifdef SOL_CHECK_ARGUMENTS
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stack::check<basic_protected_function>(L, index, type_panic);
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#endif // Safety
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}
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template<typename... Args>
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protected_function_result operator()(Args&&... args) const {
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return call<>(std::forward<Args>(args)...);
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}
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template<typename... Ret, typename... Args>
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decltype(auto) operator()(types<Ret...>, Args&&... args) const {
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return call<Ret...>(std::forward<Args>(args)...);
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}
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template<typename... Ret, typename... Args>
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decltype(auto) call(Args&&... args) const {
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handler h(error_handler);
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base_t::push();
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int pushcount = stack::multi_push_reference(base_t::lua_state(), std::forward<Args>(args)...);
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return invoke(types<Ret...>(), std::make_index_sequence<sizeof...(Ret)>(), pushcount, h);
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}
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};
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} // sol
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#endif // SOL_FUNCTION_HPP
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