mirror of
https://github.com/ThePhD/sol2.git
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240 lines
9.6 KiB
C++
240 lines
9.6 KiB
C++
// sol2
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// The MIT License (MIT)
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// Copyright (c) 2013-2018 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_COROUTINE_HPP
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#define SOL_COROUTINE_HPP
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#include "reference.hpp"
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#include "stack.hpp"
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#include "function_result.hpp"
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#include "thread.hpp"
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#include "protected_handler.hpp"
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namespace sol {
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template <typename base_t>
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class basic_coroutine : public base_t {
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public:
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typedef reference handler_t;
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handler_t error_handler;
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private:
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call_status stats = call_status::yielded;
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void luacall(std::ptrdiff_t argcount, std::ptrdiff_t) {
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stats = static_cast<call_status>(lua_resume(lua_state(), nullptr, static_cast<int>(argcount)));
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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) {
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luacall(n, sizeof...(Ret));
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return stack::pop<std::tuple<Ret...>>(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) {
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luacall(n, 1);
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return stack::pop<Ret>(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) {
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luacall(n, 0);
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}
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protected_function_result invoke(types<>, std::index_sequence<>, std::ptrdiff_t n) {
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int firstreturn = 1;
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luacall(n, LUA_MULTRET);
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int poststacksize = lua_gettop(this->lua_state());
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int returncount = poststacksize - (firstreturn - 1);
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if (error()) {
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if (error_handler.valid()) {
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string_view err = stack::get<string_view>(this->lua_state(), poststacksize);
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error_handler.push();
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stack::push(this->lua_state(), err);
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lua_call(lua_state(), 1, 1);
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}
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return protected_function_result(this->lua_state(), lua_absindex(this->lua_state(), -1), 1, returncount, status());
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}
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return protected_function_result(this->lua_state(), firstreturn, returncount, returncount, status());
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}
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public:
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using base_t::lua_state;
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basic_coroutine() = default;
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template <typename T, meta::enable<meta::neg<std::is_same<meta::unqualified_t<T>, basic_coroutine>>, meta::neg<std::is_base_of<proxy_base_tag, meta::unqualified_t<T>>>, meta::neg<std::is_same<base_t, stack_reference>>, meta::neg<std::is_same<lua_nil_t, meta::unqualified_t<T>>>, is_lua_reference<meta::unqualified_t<T>>> = meta::enabler>
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basic_coroutine(T&& r) noexcept
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: base_t(std::forward<T>(r)), error_handler(detail::get_default_handler<reference, is_main_threaded<base_t>::value>(r.lua_state())) {
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#if defined(SOL_SAFE_REFERENCES) && SOL_SAFE_REFERENCES
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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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constructor_handler handler{};
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stack::check<basic_coroutine>(lua_state(), -1, handler);
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}
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#endif // Safety
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}
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basic_coroutine(const basic_coroutine&) = default;
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basic_coroutine& operator=(const basic_coroutine&) = default;
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basic_coroutine(basic_coroutine&&) = default;
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basic_coroutine& operator=(basic_coroutine&&) = default;
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basic_coroutine(const basic_function<base_t>& b)
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: basic_coroutine(b, detail::get_default_handler<reference, is_main_threaded<base_t>::value>(b.lua_state())) {
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}
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basic_coroutine(basic_function<base_t>&& b)
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: basic_coroutine(std::move(b), detail::get_default_handler<reference, is_main_threaded<base_t>::value>(b.lua_state())) {
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}
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basic_coroutine(const basic_function<base_t>& b, handler_t eh)
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: base_t(b), error_handler(std::move(eh)) {
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}
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basic_coroutine(basic_function<base_t>&& b, handler_t eh)
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: base_t(std::move(b)), error_handler(std::move(eh)) {
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}
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basic_coroutine(const stack_reference& r)
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: basic_coroutine(r.lua_state(), r.stack_index(), detail::get_default_handler<reference, is_main_threaded<base_t>::value>(r.lua_state())) {
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}
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basic_coroutine(stack_reference&& r)
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: basic_coroutine(r.lua_state(), r.stack_index(), detail::get_default_handler<reference, is_main_threaded<base_t>::value>(r.lua_state())) {
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}
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basic_coroutine(const stack_reference& r, handler_t eh)
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: basic_coroutine(r.lua_state(), r.stack_index(), std::move(eh)) {
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}
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basic_coroutine(stack_reference&& r, handler_t eh)
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: basic_coroutine(r.lua_state(), r.stack_index(), std::move(eh)) {
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}
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template <typename Super>
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basic_coroutine(const proxy_base<Super>& p)
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: basic_coroutine(p, detail::get_default_handler<reference, is_main_threaded<base_t>::value>(p.lua_state())) {
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}
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template <typename Super>
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basic_coroutine(proxy_base<Super>&& p)
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: basic_coroutine(std::move(p), detail::get_default_handler<reference, is_main_threaded<base_t>::value>(p.lua_state())) {
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}
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template <typename Proxy, typename Handler, meta::enable<std::is_base_of<proxy_base_tag, meta::unqualified_t<Proxy>>, meta::neg<is_lua_index<meta::unqualified_t<Handler>>>> = meta::enabler>
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basic_coroutine(Proxy&& p, Handler&& eh)
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: basic_coroutine(detail::force_cast<base_t>(p), std::forward<Handler>(eh)) {
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}
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template <typename T, meta::enable<is_lua_reference<meta::unqualified_t<T>>> = meta::enabler>
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basic_coroutine(lua_State* L, T&& r)
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: basic_coroutine(L, std::forward<T>(r), detail::get_default_handler<reference, is_main_threaded<base_t>::value>(L)) {
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}
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template <typename T, meta::enable<is_lua_reference<meta::unqualified_t<T>>> = meta::enabler>
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basic_coroutine(lua_State* L, T&& r, handler_t eh)
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: base_t(L, std::forward<T>(r)), error_handler(std::move(eh)) {
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#if defined(SOL_SAFE_REFERENCES) && SOL_SAFE_REFERENCES
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auto pp = stack::push_pop(*this);
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constructor_handler handler{};
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stack::check<basic_coroutine>(lua_state(), -1, handler);
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#endif // Safety
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}
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basic_coroutine(lua_nil_t n)
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: base_t(n), error_handler(n) {
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}
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basic_coroutine(lua_State* L, int index = -1)
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: basic_coroutine(L, index, detail::get_default_handler<reference, is_main_threaded<base_t>::value>(L)) {
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}
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basic_coroutine(lua_State* L, int index, handler_t eh)
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: base_t(L, index), error_handler(std::move(eh)) {
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#ifdef SOL_SAFE_REFERENCES
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constructor_handler handler{};
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stack::check<basic_coroutine>(L, index, handler);
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#endif // Safety
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}
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basic_coroutine(lua_State* L, absolute_index index)
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: basic_coroutine(L, index, detail::get_default_handler<reference, is_main_threaded<base_t>::value>(L)) {
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}
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basic_coroutine(lua_State* L, absolute_index index, handler_t eh)
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: base_t(L, index), error_handler(std::move(eh)) {
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#if defined(SOL_SAFE_REFERENCES) && SOL_SAFE_REFERENCES
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constructor_handler handler{};
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stack::check<basic_coroutine>(L, index, handler);
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#endif // Safety
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}
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basic_coroutine(lua_State* L, raw_index index)
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: basic_coroutine(L, index, detail::get_default_handler<reference, is_main_threaded<base_t>::value>(L)) {
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}
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basic_coroutine(lua_State* L, raw_index index, handler_t eh)
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: base_t(L, index), error_handler(std::move(eh)) {
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#if defined(SOL_SAFE_REFERENCES) && SOL_SAFE_REFERENCES
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constructor_handler handler{};
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stack::check<basic_coroutine>(L, index, handler);
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#endif // Safety
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}
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basic_coroutine(lua_State* L, ref_index index)
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: basic_coroutine(L, index, detail::get_default_handler<reference, is_main_threaded<base_t>::value>(L)) {
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}
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basic_coroutine(lua_State* L, ref_index index, handler_t eh)
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: base_t(L, index), error_handler(std::move(eh)) {
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#if defined(SOL_SAFE_REFERENCES) && SOL_SAFE_REFERENCES
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auto pp = stack::push_pop(*this);
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constructor_handler handler{};
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stack::check<basic_coroutine>(lua_state(), -1, handler);
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#endif // Safety
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}
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call_status status() const noexcept {
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return stats;
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}
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bool error() const noexcept {
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call_status cs = status();
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return cs != call_status::ok && cs != call_status::yielded;
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}
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bool runnable() const noexcept {
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return base_t::valid()
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&& (status() == call_status::yielded);
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}
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explicit operator bool() const noexcept {
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return runnable();
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}
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template <typename... Args>
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protected_function_result operator()(Args&&... args) {
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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) {
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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) {
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// some users screw up coroutine.create
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// and try to use it with sol::coroutine without ever calling the first resume in Lua
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// this makes the stack incompatible with other kinds of stacks: protect against this
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// make sure coroutines don't screw us over
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base_t::push();
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int pushcount = stack::multi_push_reference(lua_state(), std::forward<Args>(args)...);
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return invoke(types<Ret...>(), std::make_index_sequence<sizeof...(Ret)>(), pushcount);
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}
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};
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} // namespace sol
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#endif // SOL_COUROUTINE_HPP
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