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sol2/sol/call.hpp
ThePhD 58003669fb this_environment is now live
2017-05-09 13:24:56 -04:00

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// The MIT License (MIT)
// Copyright (c) 2013-2016 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_CALL_HPP
#define SOL_CALL_HPP
#include "protect.hpp"
#include "wrapper.hpp"
#include "property.hpp"
#include "stack.hpp"
namespace sol {
namespace function_detail {
inline int no_construction_error(lua_State* L) {
return luaL_error(L, "sol: cannot call this constructor (tagged as non-constructible)");
}
}
namespace call_detail {
template <typename R, typename W>
inline auto& pick(std::true_type, property_wrapper<R, W>& f) {
return f.read;
}
template <typename R, typename W>
inline auto& pick(std::false_type, property_wrapper<R, W>& f) {
return f.write;
}
template <typename T, typename List>
struct void_call : void_call<T, meta::function_args_t<List>> {};
template <typename T, typename... Args>
struct void_call<T, types<Args...>> {
static void call(Args...) {}
};
template <typename T>
struct constructor_match {
T* obj;
constructor_match(T* o) : obj(o) {}
template <typename Fx, std::size_t I, typename... R, typename... Args>
int operator()(types<Fx>, index_value<I>, types<R...> r, types<Args...> a, lua_State* L, int, int start) const {
detail::default_construct func{};
return stack::call_into_lua<stack::stack_detail::default_check_arguments>(r, a, L, start, func, obj);
}
};
namespace overload_detail {
template <std::size_t... M, typename Match, typename... Args>
inline int overload_match_arity(types<>, std::index_sequence<>, std::index_sequence<M...>, Match&&, lua_State* L, int, int, Args&&...) {
return luaL_error(L, "sol: no matching function call takes this number of arguments and the specified types");
}
template <typename Fx, typename... Fxs, std::size_t I, std::size_t... In, std::size_t... M, typename Match, typename... Args>
inline int overload_match_arity(types<Fx, Fxs...>, std::index_sequence<I, In...>, std::index_sequence<M...>, Match&& matchfx, lua_State* L, int fxarity, int start, Args&&... args) {
typedef lua_bind_traits<meta::unqualified_t<Fx>> traits;
typedef meta::tuple_types<typename traits::return_type> return_types;
typedef typename traits::free_args_list args_list;
// compile-time eliminate any functions that we know ahead of time are of improper arity
if (meta::find_in_pack_v<index_value<traits::free_arity>, index_value<M>...>::value) {
return overload_match_arity(types<Fxs...>(), std::index_sequence<In...>(), std::index_sequence<M...>(), std::forward<Match>(matchfx), L, fxarity, start, std::forward<Args>(args)...);
}
if (!traits::runtime_variadics_t::value && traits::free_arity != fxarity) {
return overload_match_arity(types<Fxs...>(), std::index_sequence<In...>(), std::index_sequence<traits::free_arity, M...>(), std::forward<Match>(matchfx), L, fxarity, start, std::forward<Args>(args)...);
}
stack::record tracking{};
if (!stack::stack_detail::check_types<true>{}.check(args_list(), L, start, no_panic, tracking)) {
return overload_match_arity(types<Fxs...>(), std::index_sequence<In...>(), std::index_sequence<M...>(), std::forward<Match>(matchfx), L, fxarity, start, std::forward<Args>(args)...);
}
return matchfx(types<Fx>(), index_value<I>(), return_types(), args_list(), L, fxarity, start, std::forward<Args>(args)...);
}
template <std::size_t... M, typename Match, typename... Args>
inline int overload_match_arity_single(types<>, std::index_sequence<>, std::index_sequence<M...>, Match&& matchfx, lua_State* L, int fxarity, int start, Args&&... args) {
return overload_match_arity(types<>(), std::index_sequence<>(), std::index_sequence<M...>(), std::forward<Match>(matchfx), L, fxarity, start, std::forward<Args>(args)...);
}
template <typename Fx, std::size_t I, std::size_t... M, typename Match, typename... Args>
inline int overload_match_arity_single(types<Fx>, std::index_sequence<I>, std::index_sequence<M...>, Match&& matchfx, lua_State* L, int fxarity, int start, Args&&... args) {
typedef lua_bind_traits<meta::unqualified_t<Fx>> traits;
typedef meta::tuple_types<typename traits::return_type> return_types;
typedef typename traits::free_args_list args_list;
// compile-time eliminate any functions that we know ahead of time are of improper arity
if (meta::find_in_pack_v<index_value<traits::free_arity>, index_value<M>...>::value) {
return overload_match_arity(types<>(), std::index_sequence<>(), std::index_sequence<M...>(), std::forward<Match>(matchfx), L, fxarity, start, std::forward<Args>(args)...);
}
if (!traits::runtime_variadics_t::value && traits::free_arity != fxarity) {
return overload_match_arity(types<>(), std::index_sequence<>(), std::index_sequence<traits::free_arity, M...>(), std::forward<Match>(matchfx), L, fxarity, start, std::forward<Args>(args)...);
}
return matchfx(types<Fx>(), index_value<I>(), return_types(), args_list(), L, fxarity, start, std::forward<Args>(args)...);
}
template <typename Fx, typename Fx1, typename... Fxs, std::size_t I, std::size_t I1, std::size_t... In, std::size_t... M, typename Match, typename... Args>
inline int overload_match_arity_single(types<Fx, Fx1, Fxs...>, std::index_sequence<I, I1, In...>, std::index_sequence<M...>, Match&& matchfx, lua_State* L, int fxarity, int start, Args&&... args) {
typedef lua_bind_traits<meta::unqualified_t<Fx>> traits;
typedef meta::tuple_types<typename traits::return_type> return_types;
typedef typename traits::free_args_list args_list;
// compile-time eliminate any functions that we know ahead of time are of improper arity
if (meta::find_in_pack_v<index_value<traits::free_arity>, index_value<M>...>::value) {
return overload_match_arity(types<Fx1, Fxs...>(), std::index_sequence<I1, In...>(), std::index_sequence<M...>(), std::forward<Match>(matchfx), L, fxarity, start, std::forward<Args>(args)...);
}
if (!traits::runtime_variadics_t::value && traits::free_arity != fxarity) {
return overload_match_arity(types<Fx1, Fxs...>(), std::index_sequence<I1, In...>(), std::index_sequence<traits::free_arity, M...>(), std::forward<Match>(matchfx), L, fxarity, start, std::forward<Args>(args)...);
}
stack::record tracking{};
if (!stack::stack_detail::check_types<true>{}.check(args_list(), L, start, no_panic, tracking)) {
return overload_match_arity(types<Fx1, Fxs...>(), std::index_sequence<I1, In...>(), std::index_sequence<M...>(), std::forward<Match>(matchfx), L, fxarity, start, std::forward<Args>(args)...);
}
return matchfx(types<Fx>(), index_value<I>(), return_types(), args_list(), L, fxarity, start, std::forward<Args>(args)...);
}
} // overload_detail
template <typename... Functions, typename Match, typename... Args>
inline int overload_match_arity(Match&& matchfx, lua_State* L, int fxarity, int start, Args&&... args) {
return overload_detail::overload_match_arity_single(types<Functions...>(), std::make_index_sequence<sizeof...(Functions)>(), std::index_sequence<>(), std::forward<Match>(matchfx), L, fxarity, start, std::forward<Args>(args)...);
}
template <typename... Functions, typename Match, typename... Args>
inline int overload_match(Match&& matchfx, lua_State* L, int start, Args&&... args) {
int fxarity = lua_gettop(L) - (start - 1);
return overload_match_arity<Functions...>(std::forward<Match>(matchfx), L, fxarity, start, std::forward<Args>(args)...);
}
template <typename T, typename... TypeLists, typename Match, typename... Args>
inline int construct_match(Match&& matchfx, lua_State* L, int fxarity, int start, Args&&... args) {
// use same overload resolution matching as all other parts of the framework
return overload_match_arity<decltype(void_call<T, TypeLists>::call)...>(std::forward<Match>(matchfx), L, fxarity, start, std::forward<Args>(args)...);
}
template <typename T, typename... TypeLists>
inline int construct(lua_State* L) {
static const auto& meta = usertype_traits<T>::metatable();
int argcount = lua_gettop(L);
call_syntax syntax = argcount > 0 ? stack::get_call_syntax(L, &usertype_traits<T>::user_metatable()[0], 1) : call_syntax::dot;
argcount -= static_cast<int>(syntax);
T** pointerpointer = reinterpret_cast<T**>(lua_newuserdata(L, sizeof(T*) + sizeof(T)));
T*& referencepointer = *pointerpointer;
T* obj = reinterpret_cast<T*>(pointerpointer + 1);
referencepointer = obj;
reference userdataref(L, -1);
userdataref.pop();
construct_match<T, TypeLists...>(constructor_match<T>(obj), L, argcount, 1 + static_cast<int>(syntax));
userdataref.push();
luaL_getmetatable(L, &meta[0]);
if (type_of(L, -1) == type::lua_nil) {
lua_pop(L, 1);
return luaL_error(L, "sol: unable to get usertype metatable");
}
lua_setmetatable(L, -2);
return 1;
}
template <typename F, bool is_index, bool is_variable, bool checked, int boost, typename = void>
struct agnostic_lua_call_wrapper {
template <typename Fx, typename... Args>
static int call(lua_State* L, Fx&& f, Args&&... args) {
typedef wrapper<meta::unqualified_t<F>> wrap;
typedef typename wrap::returns_list returns_list;
typedef typename wrap::free_args_list args_list;
typedef typename wrap::caller caller;
return stack::call_into_lua<checked>(returns_list(), args_list(), L, boost + 1, caller(), std::forward<Fx>(f), std::forward<Args>(args)...);
}
};
template <typename T, bool is_variable, bool checked, int boost, typename C>
struct agnostic_lua_call_wrapper<var_wrapper<T>, true, is_variable, checked, boost, C> {
template <typename F>
static int call(lua_State* L, F&& f) {
return stack::push_reference(L, detail::unwrap(f.value));
}
};
template <typename T, bool is_variable, bool checked, int boost, typename C>
struct agnostic_lua_call_wrapper<var_wrapper<T>, false, is_variable, checked, boost, C> {
template <typename V>
static int call_assign(std::true_type, lua_State* L, V&& f) {
detail::unwrap(f.value) = stack::get<meta::unwrapped_t<T>>(L, boost + (is_variable ? 3 : 1));
return 0;
}
template <typename... Args>
static int call_assign(std::false_type, lua_State* L, Args&&...) {
return luaL_error(L, "sol: cannot write to this variable: copy assignment/constructor not available");
}
template <typename... Args>
static int call_const(std::false_type, lua_State* L, Args&&... args) {
typedef meta::unwrapped_t<T> R;
return call_assign(std::is_assignable<std::add_lvalue_reference_t<meta::unqualified_t<R>>, R>(), L, std::forward<Args>(args)...);
}
template <typename... Args>
static int call_const(std::true_type, lua_State* L, Args&&...) {
return luaL_error(L, "sol: cannot write to a readonly (const) variable");
}
template <typename V>
static int call(lua_State* L, V&& f) {
return call_const(std::is_const<meta::unwrapped_t<T>>(), L, f);
}
};
template <bool is_index, bool is_variable, bool checked, int boost, typename C>
struct agnostic_lua_call_wrapper<lua_r_CFunction, is_index, is_variable, checked, boost, C> {
static int call(lua_State* L, lua_r_CFunction f) {
return f(L);
}
};
template <bool is_index, bool is_variable, bool checked, int boost, typename C>
struct agnostic_lua_call_wrapper<lua_CFunction, is_index, is_variable, checked, boost, C> {
static int call(lua_State* L, lua_CFunction f) {
return f(L);
}
};
template <bool is_index, bool is_variable, bool checked, int boost, typename C>
struct agnostic_lua_call_wrapper<no_prop, is_index, is_variable, checked, boost, C> {
static int call(lua_State* L, const no_prop&) {
return luaL_error(L, is_index ? "sol: cannot read from a writeonly property" : "sol: cannot write to a readonly property");
}
};
template <bool is_index, bool is_variable, bool checked, int boost, typename C>
struct agnostic_lua_call_wrapper<no_construction, is_index, is_variable, checked, boost, C> {
static int call(lua_State* L, const no_construction&) {
return function_detail::no_construction_error(L);
}
};
template <typename... Args, bool is_index, bool is_variable, bool checked, int boost, typename C>
struct agnostic_lua_call_wrapper<bases<Args...>, is_index, is_variable, checked, boost, C> {
static int call(lua_State*, const bases<Args...>&) {
// Uh. How did you even call this, lul
return 0;
}
};
template <typename T, typename F, bool is_index, bool is_variable, bool checked = stack::stack_detail::default_check_arguments, int boost = 0, typename = void>
struct lua_call_wrapper : agnostic_lua_call_wrapper<F, is_index, is_variable, checked, boost> {};
template <typename T, typename F, bool is_index, bool is_variable, bool checked, int boost>
struct lua_call_wrapper<T, F, is_index, is_variable, checked, boost, std::enable_if_t<std::is_member_function_pointer<F>::value>> {
typedef wrapper<meta::unqualified_t<F>> wrap;
typedef typename wrap::object_type object_type;
template <typename Fx>
static int call(lua_State* L, Fx&& f, object_type& o) {
typedef typename wrap::returns_list returns_list;
typedef typename wrap::args_list args_list;
typedef typename wrap::caller caller;
return stack::call_into_lua<checked>(returns_list(), args_list(), L, boost + ( is_variable ? 3 : 2 ), caller(), std::forward<Fx>(f), o);
}
template <typename Fx>
static int call(lua_State* L, Fx&& f) {
typedef std::conditional_t<std::is_void<T>::value, object_type, T> Ta;
#ifdef SOL_SAFE_USERTYPE
auto maybeo = stack::check_get<Ta*>(L, 1);
if (!maybeo || maybeo.value() == nullptr) {
return luaL_error(L, "sol: received nil for 'self' argument (use ':' for accessing member functions, make sure member variables are preceeded by the actual object with '.' syntax)");
}
object_type* o = static_cast<object_type*>(maybeo.value());
return call(L, std::forward<Fx>(f), *o);
#else
object_type& o = static_cast<object_type&>(*stack::get<non_null<Ta*>>(L, 1));
return call(L, std::forward<Fx>(f), o);
#endif // Safety
}
};
template <typename T, typename F, bool is_variable, bool checked, int boost>
struct lua_call_wrapper<T, F, false, is_variable, checked, boost, std::enable_if_t<std::is_member_object_pointer<F>::value>> {
typedef lua_bind_traits<F> traits_type;
typedef wrapper<meta::unqualified_t<F>> wrap;
typedef typename wrap::object_type object_type;
template <typename V>
static int call_assign(std::true_type, lua_State* L, V&& f, object_type& o) {
typedef typename wrap::args_list args_list;
typedef typename wrap::caller caller;
return stack::call_into_lua<checked>(types<void>(), args_list(), L, boost + ( is_variable ? 3 : 2 ), caller(), f, o);
}
template <typename V>
static int call_assign(std::true_type, lua_State* L, V&& f) {
typedef std::conditional_t<std::is_void<T>::value, object_type, T> Ta;
#ifdef SOL_SAFE_USERTYPE
auto maybeo = stack::check_get<Ta*>(L, 1);
if (!maybeo || maybeo.value() == nullptr) {
if (is_variable) {
return luaL_error(L, "sol: received nil for 'self' argument (bad '.' access?)");
}
return luaL_error(L, "sol: received nil for 'self' argument (pass 'self' as first argument)");
}
object_type* o = static_cast<object_type*>(maybeo.value());
return call_assign(std::true_type(), L, f, *o);
#else
object_type& o = static_cast<object_type&>(*stack::get<non_null<Ta*>>(L, 1));
return call_assign(std::true_type(), L, f, o);
#endif // Safety
}
template <typename... Args>
static int call_assign(std::false_type, lua_State* L, Args&&...) {
return luaL_error(L, "sol: cannot write to this variable: copy assignment/constructor not available");
}
template <typename... Args>
static int call_const(std::false_type, lua_State* L, Args&&... args) {
typedef typename traits_type::return_type R;
return call_assign(std::is_assignable<std::add_lvalue_reference_t<meta::unqualified_t<R>>, R>(), L, std::forward<Args>(args)...);
}
template <typename... Args>
static int call_const(std::true_type, lua_State* L, Args&&...) {
return luaL_error(L, "sol: cannot write to a readonly (const) variable");
}
template <typename V>
static int call(lua_State* L, V&& f) {
return call_const(std::is_const<typename traits_type::return_type>(), L, std::forward<V>(f));
}
template <typename V>
static int call(lua_State* L, V&& f, object_type& o) {
return call_const(std::is_const<typename traits_type::return_type>(), L, std::forward<V>(f), o);
}
};
template <typename T, typename F, bool is_variable, bool checked, int boost>
struct lua_call_wrapper<T, F, true, is_variable, checked, boost, std::enable_if_t<std::is_member_object_pointer<F>::value>> {
typedef lua_bind_traits<F> traits_type;
typedef wrapper<meta::unqualified_t<F>> wrap;
typedef typename wrap::object_type object_type;
template <typename V>
static int call(lua_State* L, V&& f, object_type& o) {
typedef typename wrap::returns_list returns_list;
typedef typename wrap::caller caller;
return stack::call_into_lua<checked>(returns_list(), types<>(), L, boost + ( is_variable ? 3 : 2 ), caller(), std::forward<V>(f), o);
}
template <typename V>
static int call(lua_State* L, V&& f) {
typedef std::conditional_t<std::is_void<T>::value, object_type, T> Ta;
#ifdef SOL_SAFE_USERTYPE
auto maybeo = stack::check_get<Ta*>(L, 1);
if (!maybeo || maybeo.value() == nullptr) {
if (is_variable) {
return luaL_error(L, "sol: 'self' argument is lua_nil (bad '.' access?)");
}
return luaL_error(L, "sol: 'self' argument is lua_nil (pass 'self' as first argument)");
}
object_type* o = static_cast<object_type*>(maybeo.value());
return call(L, f, *o);
#else
object_type& o = static_cast<object_type&>(*stack::get<non_null<Ta*>>(L, 1));
return call(L, f, o);
#endif // Safety
}
};
template <typename T, typename... Args, bool is_index, bool is_variable, bool checked, int boost, typename C>
struct lua_call_wrapper<T, constructor_list<Args...>, is_index, is_variable, checked, boost, C> {
typedef constructor_list<Args...> F;
static int call(lua_State* L, F&) {
const auto& metakey = usertype_traits<T>::metatable();
int argcount = lua_gettop(L);
call_syntax syntax = argcount > 0 ? stack::get_call_syntax(L, &usertype_traits<T>::user_metatable()[0], 1) : call_syntax::dot;
argcount -= static_cast<int>(syntax);
T** pointerpointer = reinterpret_cast<T**>(lua_newuserdata(L, sizeof(T*) + sizeof(T)));
reference userdataref(L, -1);
T*& referencepointer = *pointerpointer;
T* obj = reinterpret_cast<T*>(pointerpointer + 1);
referencepointer = obj;
construct_match<T, Args...>(constructor_match<T>(obj), L, argcount, boost + 1 + static_cast<int>(syntax));
userdataref.push();
luaL_getmetatable(L, &metakey[0]);
if (type_of(L, -1) == type::lua_nil) {
lua_pop(L, 1);
return luaL_error(L, "sol: unable to get usertype metatable");
}
lua_setmetatable(L, -2);
return 1;
}
};
template <typename T, typename... Cxs, bool is_index, bool is_variable, bool checked, int boost, typename C>
struct lua_call_wrapper<T, constructor_wrapper<Cxs...>, is_index, is_variable, checked, boost, C> {
typedef constructor_wrapper<Cxs...> F;
struct onmatch {
template <typename Fx, std::size_t I, typename... R, typename... Args>
int operator()(types<Fx>, index_value<I>, types<R...> r, types<Args...> a, lua_State* L, int, int start, F& f) {
const auto& metakey = usertype_traits<T>::metatable();
T** pointerpointer = reinterpret_cast<T**>(lua_newuserdata(L, sizeof(T*) + sizeof(T)));
reference userdataref(L, -1);
T*& referencepointer = *pointerpointer;
T* obj = reinterpret_cast<T*>(pointerpointer + 1);
referencepointer = obj;
auto& func = std::get<I>(f.functions);
stack::call_into_lua<checked>(r, a, L, boost + start, func, detail::implicit_wrapper<T>(obj));
userdataref.push();
luaL_getmetatable(L, &metakey[0]);
if (type_of(L, -1) == type::lua_nil) {
lua_pop(L, 1);
std::string err = "sol: unable to get usertype metatable for ";
err += usertype_traits<T>::name();
return luaL_error(L, err.c_str());
}
lua_setmetatable(L, -2);
return 1;
}
};
static int call(lua_State* L, F& f) {
call_syntax syntax = stack::get_call_syntax(L, &usertype_traits<T>::user_metatable()[0], 1);
int syntaxval = static_cast<int>(syntax);
int argcount = lua_gettop(L) - syntaxval;
return construct_match<T, meta::pop_front_type_t<meta::function_args_t<Cxs>>...>(onmatch(), L, argcount, 1 + syntaxval, f);
}
};
template <typename T, typename Fx, bool is_index, bool is_variable, bool checked, int boost>
struct lua_call_wrapper<T, destructor_wrapper<Fx>, is_index, is_variable, checked, boost, std::enable_if_t<std::is_void<Fx>::value>> {
typedef destructor_wrapper<Fx> F;
static int call(lua_State* L, const F&) {
return detail::usertype_alloc_destroy<T>(L);
}
};
template <typename T, typename Fx, bool is_index, bool is_variable, bool checked, int boost>
struct lua_call_wrapper<T, destructor_wrapper<Fx>, is_index, is_variable, checked, boost, std::enable_if_t<!std::is_void<Fx>::value>> {
typedef destructor_wrapper<Fx> F;
static int call(lua_State* L, const F& f) {
T& obj = stack::get<T>(L);
f.fx(detail::implicit_wrapper<T>(obj));
return 0;
}
};
template <typename T, typename... Fs, bool is_index, bool is_variable, bool checked, int boost, typename C>
struct lua_call_wrapper<T, overload_set<Fs...>, is_index, is_variable, checked, boost, C> {
typedef overload_set<Fs...> F;
struct on_match {
template <typename Fx, std::size_t I, typename... R, typename... Args>
int operator()(types<Fx>, index_value<I>, types<R...>, types<Args...>, lua_State* L, int, int, F& fx) {
auto& f = std::get<I>(fx.functions);
return lua_call_wrapper<T, Fx, is_index, is_variable, checked, boost>{}.call(L, f);
}
};
static int call(lua_State* L, F& fx) {
return overload_match_arity<Fs...>(on_match(), L, lua_gettop(L), 1, fx);
}
};
template <typename T, typename... Fs, bool is_index, bool is_variable, bool checked, int boost, typename C>
struct lua_call_wrapper<T, factory_wrapper<Fs...>, is_index, is_variable, checked, boost, C> {
typedef factory_wrapper<Fs...> F;
struct on_match {
template <typename Fx, std::size_t I, typename... R, typename... Args>
int operator()(types<Fx>, index_value<I>, types<R...>, types<Args...>, lua_State* L, int, int, F& fx) {
auto& f = std::get<I>(fx.functions);
return lua_call_wrapper<T, Fx, is_index, is_variable, checked, boost>{}.call(L, f);
}
};
static int call(lua_State* L, F& fx) {
return overload_match_arity<Fs...>(on_match(), L, lua_gettop(L) - boost, 1 + boost, fx);
}
};
template <typename T, typename R, typename W, bool is_index, bool is_variable, bool checked, int boost, typename C>
struct lua_call_wrapper<T, property_wrapper<R, W>, is_index, is_variable, checked, boost, C> {
typedef std::conditional_t<is_index, R, W> P;
typedef meta::unqualified_t<P> U;
typedef wrapper<U> wrap;
typedef lua_bind_traits<U> traits_type;
typedef meta::unqualified_t<typename traits_type::template arg_at<0>> object_type;
template <typename F>
static int self_call(std::true_type, lua_State* L, F&& f) {
// The type being void means we don't have any arguments, so it might be a free functions?
typedef typename traits_type::free_args_list args_list;
typedef typename wrap::returns_list returns_list;
typedef typename wrap::caller caller;
return stack::call_into_lua<checked>(returns_list(), args_list(), L, boost + (is_variable ? 3 : 2), caller(), f);
}
template <typename F>
static int self_call(std::false_type, lua_State* L, F&& f) {
typedef meta::pop_front_type_t<typename traits_type::free_args_list> args_list;
typedef T Ta;
#ifdef SOL_SAFE_USERTYPE
auto maybeo = stack::check_get<Ta*>(L, 1);
if (!maybeo || maybeo.value() == nullptr) {
if (is_variable) {
return luaL_error(L, "sol: 'self' argument is lua_nil (bad '.' access?)");
}
return luaL_error(L, "sol: 'self' argument is lua_nil (pass 'self' as first argument)");
}
object_type* o = static_cast<object_type*>(maybeo.value());
#else
object_type* o = static_cast<object_type*>(stack::get<non_null<Ta*>>(L, 1));
#endif // Safety
typedef typename wrap::returns_list returns_list;
typedef typename wrap::caller caller;
return stack::call_into_lua<checked>(returns_list(), args_list(), L, boost + (is_variable ? 3 : 2), caller(), f, *o);
}
template <typename F, typename... Args>
static int defer_call(std::false_type, lua_State* L, F&& f, Args&&... args) {
return self_call(meta::any<std::is_void<object_type>, meta::boolean<lua_type_of<meta::unwrap_unqualified_t<object_type>>::value != type::userdata>>(), L, pick(meta::boolean<is_index>(), f), std::forward<Args>(args)...);
}
template <typename F, typename... Args>
static int defer_call(std::true_type, lua_State* L, F&& f, Args&&... args) {
auto& p = pick(meta::boolean<is_index>(), std::forward<F>(f));
return lua_call_wrapper<T, meta::unqualified_t<decltype(p)>, is_index, is_variable, checked, boost>{}.call(L, p, std::forward<Args>(args)...);
}
template <typename F, typename... Args>
static int call(lua_State* L, F&& f, Args&&... args) {
typedef meta::any<
std::is_void<U>,
std::is_same<U, no_prop>,
meta::is_specialization_of<var_wrapper, U>,
meta::is_specialization_of<constructor_wrapper, U>,
meta::is_specialization_of<constructor_list, U>,
std::is_member_pointer<U>
> is_specialized;
return defer_call(is_specialized(), L, std::forward<F>(f), std::forward<Args>(args)...);
}
};
template <typename T, typename V, bool is_index, bool is_variable, bool checked, int boost, typename C>
struct lua_call_wrapper<T, protect_t<V>, is_index, is_variable, checked, boost, C> {
typedef protect_t<V> F;
template <typename... Args>
static int call(lua_State* L, F& fx, Args&&... args) {
return lua_call_wrapper<T, V, is_index, is_variable, true, boost>{}.call(L, fx.value, std::forward<Args>(args)...);
}
};
template <typename T, typename Sig, typename P, bool is_index, bool is_variable, bool checked, int boost, typename C>
struct lua_call_wrapper<T, function_arguments<Sig, P>, is_index, is_variable, checked, boost, C> {
template <typename F>
static int call(lua_State* L, F&& f) {
return lua_call_wrapper<T, meta::unqualified_t<P>, is_index, is_variable, stack::stack_detail::default_check_arguments, boost>{}.call(L, std::get<0>(f.arguments));
}
};
template <typename T, bool is_index, bool is_variable, int boost = 0, typename Fx, typename... Args>
inline int call_wrapped(lua_State* L, Fx&& fx, Args&&... args) {
return lua_call_wrapper<T, meta::unqualified_t<Fx>, is_index, is_variable, stack::stack_detail::default_check_arguments, boost>{}.call(L, std::forward<Fx>(fx), std::forward<Args>(args)...);
}
template <typename T, bool is_index, bool is_variable, typename F, int start = 1>
inline int call_user(lua_State* L) {
auto& fx = stack::get<user<F>>(L, upvalue_index(start));
return call_wrapped<T, is_index, is_variable>(L, fx);
}
template <typename T, typename = void>
struct is_var_bind : std::false_type {};
template <typename T>
struct is_var_bind<T, std::enable_if_t<std::is_member_object_pointer<T>::value>> : std::true_type {};
template <>
struct is_var_bind<no_prop> : std::true_type {};
template <typename R, typename W>
struct is_var_bind<property_wrapper<R, W>> : std::true_type {};
template <typename T>
struct is_var_bind<var_wrapper<T>> : std::true_type {};
} // call_detail
template <typename T>
struct is_variable_binding : call_detail::is_var_bind<meta::unqualified_t<T>> {};
template <typename T>
struct is_function_binding : meta::neg<is_variable_binding<T>> {};
} // sol
#endif // SOL_CALL_HPP
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