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/*
* Copyright 2019 by its authors. See AUTHORS.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef EOLIAN_CXX_ATTRIBUTE_REORDER_HH
#define EOLIAN_CXX_ATTRIBUTE_REORDER_HH
#include "generator.hpp"
#include "attributes.hpp"
namespace efl { namespace eolian { namespace grammar {
template <typename Tuple, int...S>
struct reorder_tuple
{
Tuple* tuple;
};
namespace impl {
template <int N, typename T>
struct index_calc;
template <int N, typename Tuple, int...S>
struct index_calc<0, reorder_tuple<Tuple, N, S...>> : std::integral_constant<int, N> {};
template <int I, int N, typename Tuple, int...S>
struct index_calc<I, reorder_tuple<Tuple, N, S...>> : index_calc<I-1, reorder_tuple<Tuple, S...>> {};
}
namespace attributes {
template <int N, typename Tuple, int...S>
struct tuple_element<N, reorder_tuple<Tuple, S...>>
{
template <typename T>
struct identity { typedef T type; };
typedef impl::index_calc<N, reorder_tuple<Tuple, S...>> index;
typedef typename std::conditional
<index::value == -1
, identity<Tuple>
, tuple_element<index::value, typename std::remove_const<Tuple>::type>>::type::type type;
static type const& get_impl(reorder_tuple<Tuple, S...> const& t
, std::integral_constant<int, -1>)
{ return *t.tuple; }
template <int I>
static type const& get_impl(reorder_tuple<Tuple, S...> const& t
, std::integral_constant<int, I>)
{ using std::get; return get<index::value>(*t.tuple); }
static type const& get(reorder_tuple<Tuple, S...> const& t)
{ return get_impl(t, index{}); }
};
}
template <int N, typename Tuple, int...S>
typename attributes::tuple_element<N, reorder_tuple<Tuple, S...>>::type const& get(reorder_tuple<Tuple, S...>const& t)
{
return attributes::tuple_element<N, reorder_tuple<Tuple, S...>>::get(t);
}
template <typename G, int...S>
struct attribute_reorder_generator
{
template <typename OutputIterator, typename Attribute, typename Context>
bool generate(OutputIterator sink, Attribute const& attribute, Context const& ctx) const
{
return attributes::generate(as_generator(g), sink, reorder_tuple<Attribute const, S...>{&attribute}, ctx);
}
G g;
};
template <typename G, int...S>
struct is_eager_generator<attribute_reorder_generator<G, S...>> : std::true_type {};
template <typename G, int...S>
struct is_generator<attribute_reorder_generator<G, S...>> : std::true_type {};
template <int...S, typename G>
attribute_reorder_generator<G, S...> attribute_reorder(G g)
{
return {g};
}
namespace type_traits {
template <typename G, int...S>
struct attributes_needed<attribute_reorder_generator<G, S...>> : attributes_needed<G> {};
template <int...S, typename Tuple>
struct is_explicit_tuple<reorder_tuple<Tuple, S...>> : std::true_type {};
template <int...S, typename Tuple>
struct is_tuple<reorder_tuple<Tuple, S...>> : std::true_type {};
}
} } }
#endif
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