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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_COROUTINE_HPP
#define SOL_COROUTINE_HPP
#include "reference.hpp"
#include "object.hpp"
#include "stack.hpp"
#include "function_result.hpp"
#include "thread.hpp"
#include "protected_handler.hpp"
namespace sol {
template <typename ref_t>
class basic_coroutine : public basic_object<ref_t> {
private:
using base_t = basic_object<ref_t>;
public:
typedef reference handler_t;
handler_t error_handler;
private:
call_status stats = call_status::yielded;
void luacall(std::ptrdiff_t argcount, std::ptrdiff_t) {
#if SOL_LUA_VERSION >= 504
int nresults;
stats = static_cast<call_status>(lua_resume(lua_state(), nullptr, static_cast<int>(argcount), &nresults));
#else
stats = static_cast<call_status>(lua_resume(lua_state(), nullptr, static_cast<int>(argcount)));
#endif
}
template <std::size_t... I, typename... Ret>
auto invoke(types<Ret...>, std::index_sequence<I...>, std::ptrdiff_t n) {
luacall(n, sizeof...(Ret));
return stack::pop<std::tuple<Ret...>>(lua_state());
}
template <std::size_t I, typename Ret>
Ret invoke(types<Ret>, std::index_sequence<I>, std::ptrdiff_t n) {
luacall(n, 1);
return stack::pop<Ret>(lua_state());
}
template <std::size_t I>
void invoke(types<void>, std::index_sequence<I>, std::ptrdiff_t n) {
luacall(n, 0);
}
protected_function_result invoke(types<>, std::index_sequence<>, std::ptrdiff_t n) {
int firstreturn = 1;
luacall(n, LUA_MULTRET);
int poststacksize = lua_gettop(this->lua_state());
int returncount = poststacksize - (firstreturn - 1);
if (error()) {
if (error_handler.valid()) {
string_view err = stack::get<string_view>(this->lua_state(), poststacksize);
error_handler.push();
stack::push(this->lua_state(), err);
lua_call(lua_state(), 1, 1);
}
return protected_function_result(this->lua_state(), lua_absindex(this->lua_state(), -1), 1, returncount, status());
}
return protected_function_result(this->lua_state(), firstreturn, returncount, returncount, status());
}
public:
using base_t::lua_state;
basic_coroutine() = default;
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>
basic_coroutine(T&& r) noexcept
: base_t(std::forward<T>(r)), error_handler(detail::get_default_handler<reference, is_main_threaded<base_t>::value>(r.lua_state())) {
#if defined(SOL_SAFE_REFERENCES) && SOL_SAFE_REFERENCES
if (!is_function<meta::unqualified_t<T>>::value) {
auto pp = stack::push_pop(*this);
constructor_handler handler{};
stack::check<basic_coroutine>(lua_state(), -1, handler);
}
#endif // Safety
}
basic_coroutine(const basic_coroutine&) = default;
basic_coroutine& operator=(const basic_coroutine&) = default;
basic_coroutine(basic_coroutine&&) = default;
basic_coroutine& operator=(basic_coroutine&&) = default;
basic_coroutine(const basic_function<base_t>& b)
: basic_coroutine(b, detail::get_default_handler<reference, is_main_threaded<base_t>::value>(b.lua_state())) {
}
basic_coroutine(basic_function<base_t>&& b)
: basic_coroutine(std::move(b), detail::get_default_handler<reference, is_main_threaded<base_t>::value>(b.lua_state())) {
}
basic_coroutine(const basic_function<base_t>& b, handler_t eh)
: base_t(b), error_handler(std::move(eh)) {
}
basic_coroutine(basic_function<base_t>&& b, handler_t eh)
: base_t(std::move(b)), error_handler(std::move(eh)) {
}
basic_coroutine(const stack_reference& r)
: basic_coroutine(r.lua_state(), r.stack_index(), detail::get_default_handler<reference, is_main_threaded<base_t>::value>(r.lua_state())) {
}
basic_coroutine(stack_reference&& r)
: basic_coroutine(r.lua_state(), r.stack_index(), detail::get_default_handler<reference, is_main_threaded<base_t>::value>(r.lua_state())) {
}
basic_coroutine(const stack_reference& r, handler_t eh)
: basic_coroutine(r.lua_state(), r.stack_index(), std::move(eh)) {
}
basic_coroutine(stack_reference&& r, handler_t eh)
: basic_coroutine(r.lua_state(), r.stack_index(), std::move(eh)) {
}
template <typename Super>
basic_coroutine(const proxy_base<Super>& p)
: basic_coroutine(p, detail::get_default_handler<reference, is_main_threaded<base_t>::value>(p.lua_state())) {
}
template <typename Super>
basic_coroutine(proxy_base<Super>&& p)
: basic_coroutine(std::move(p), detail::get_default_handler<reference, is_main_threaded<base_t>::value>(p.lua_state())) {
}
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>
basic_coroutine(Proxy&& p, Handler&& eh)
: basic_coroutine(detail::force_cast<base_t>(p), std::forward<Handler>(eh)) {
}
template <typename T, meta::enable<is_lua_reference<meta::unqualified_t<T>>> = meta::enabler>
basic_coroutine(lua_State* L, T&& r)
: basic_coroutine(L, std::forward<T>(r), detail::get_default_handler<reference, is_main_threaded<base_t>::value>(L)) {
}
template <typename T, meta::enable<is_lua_reference<meta::unqualified_t<T>>> = meta::enabler>
basic_coroutine(lua_State* L, T&& r, handler_t eh)
: base_t(L, std::forward<T>(r)), error_handler(std::move(eh)) {
#if defined(SOL_SAFE_REFERENCES) && SOL_SAFE_REFERENCES
auto pp = stack::push_pop(*this);
constructor_handler handler{};
stack::check<basic_coroutine>(lua_state(), -1, handler);
#endif // Safety
}
basic_coroutine(lua_nil_t n)
: base_t(n), error_handler(n) {
}
basic_coroutine(lua_State* L, int index = -1)
: basic_coroutine(L, index, detail::get_default_handler<reference, is_main_threaded<base_t>::value>(L)) {
}
basic_coroutine(lua_State* L, int index, handler_t eh)
: base_t(L, index), error_handler(std::move(eh)) {
#ifdef SOL_SAFE_REFERENCES
constructor_handler handler{};
stack::check<basic_coroutine>(L, index, handler);
#endif // Safety
}
basic_coroutine(lua_State* L, absolute_index index)
: basic_coroutine(L, index, detail::get_default_handler<reference, is_main_threaded<base_t>::value>(L)) {
}
basic_coroutine(lua_State* L, absolute_index index, handler_t eh)
: base_t(L, index), error_handler(std::move(eh)) {
#if defined(SOL_SAFE_REFERENCES) && SOL_SAFE_REFERENCES
constructor_handler handler{};
stack::check<basic_coroutine>(L, index, handler);
#endif // Safety
}
basic_coroutine(lua_State* L, raw_index index)
: basic_coroutine(L, index, detail::get_default_handler<reference, is_main_threaded<base_t>::value>(L)) {
}
basic_coroutine(lua_State* L, raw_index index, handler_t eh)
: base_t(L, index), error_handler(std::move(eh)) {
#if defined(SOL_SAFE_REFERENCES) && SOL_SAFE_REFERENCES
constructor_handler handler{};
stack::check<basic_coroutine>(L, index, handler);
#endif // Safety
}
basic_coroutine(lua_State* L, ref_index index)
: basic_coroutine(L, index, detail::get_default_handler<reference, is_main_threaded<base_t>::value>(L)) {
}
basic_coroutine(lua_State* L, ref_index index, handler_t eh)
: base_t(L, index), error_handler(std::move(eh)) {
#if defined(SOL_SAFE_REFERENCES) && SOL_SAFE_REFERENCES
auto pp = stack::push_pop(*this);
constructor_handler handler{};
stack::check<basic_coroutine>(lua_state(), -1, handler);
#endif // Safety
}
call_status status() const noexcept {
return stats;
}
bool error() const noexcept {
call_status cs = status();
return cs != call_status::ok && cs != call_status::yielded;
}
bool runnable() const noexcept {
return base_t::valid()
&& (status() == call_status::yielded);
}
explicit operator bool() const noexcept {
return runnable();
}
template <typename... Args>
protected_function_result operator()(Args&&... args) {
return call<>(std::forward<Args>(args)...);
}
template <typename... Ret, typename... Args>
decltype(auto) operator()(types<Ret...>, Args&&... args) {
return call<Ret...>(std::forward<Args>(args)...);
}
template <typename... Ret, typename... Args>
decltype(auto) call(Args&&... args) {
// some users screw up coroutine.create
// and try to use it with sol::coroutine without ever calling the first resume in Lua
// this makes the stack incompatible with other kinds of stacks: protect against this
// make sure coroutines don't screw us over
base_t::push();
int pushcount = stack::multi_push_reference(lua_state(), std::forward<Args>(args)...);
return invoke(types<Ret...>(), std::make_index_sequence<sizeof...(Ret)>(), pushcount);
}
};
} // namespace sol
#endif // SOL_COUROUTINE_HPP
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