/*=============================================================================
    Copyright (c) 2001-2014 Joel de Guzman
    http://spirit.sourceforge.net/

    Distributed under the Boost Software License, Version 1.0. (See accompanying
    file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
=============================================================================*/
#if !defined(BOOST_SPIRIT_X3_ATTRIBUTE_CATEGORY_JAN_4_2012_1150AM)
#define BOOST_SPIRIT_X3_ATTRIBUTE_CATEGORY_JAN_4_2012_1150AM

#include <boost/mpl/identity.hpp>
#include <boost/mpl/logical.hpp>
#include <boost/mpl/eval_if.hpp>
#include <boost/fusion/include/is_sequence.hpp>
#include <boost/fusion/support/category_of.hpp>
#include <boost/spirit/home/x3/support/traits/is_variant.hpp>
#include <boost/spirit/home/x3/support/traits/is_range.hpp>
#include <boost/spirit/home/x3/support/traits/container_traits.hpp>
#include <boost/spirit/home/x3/support/traits/optional_traits.hpp>

namespace boost {
namespace spirit {
namespace x3 {
struct unused_type;
}
}
}

namespace boost {
namespace spirit {
namespace x3 {
namespace traits {
struct unused_attribute {};
struct plain_attribute {};
struct container_attribute {};
struct tuple_attribute {};
struct associative_attribute {};
struct variant_attribute {};
struct optional_attribute {};
struct range_attribute {};

template <typename T, typename Enable = void>
struct attribute_category
    : mpl::identity<plain_attribute> {};

template <>
struct attribute_category<unused_type>
    : mpl::identity<unused_attribute> {};

template <>
struct attribute_category<unused_type const>
    : mpl::identity<unused_attribute> {};

template <typename T>
struct attribute_category< T
    , typename enable_if<
    typename mpl::eval_if<
    fusion::traits::is_sequence<T>
    , fusion::traits::is_associative<T>
    , mpl::false_
    >::type >::type >
    : mpl::identity<associative_attribute> {};

template <typename T>
struct attribute_category< T
    , typename enable_if<
    mpl::and_<
    fusion::traits::is_sequence<T>
    , mpl::not_<fusion::traits::is_associative<T> >
    > >::type >
    : mpl::identity<tuple_attribute> {};

template <typename T>
struct attribute_category<T,
           typename enable_if<traits::is_variant<T>>::type>
           : mpl::identity<variant_attribute> {};

template <typename T>
struct attribute_category<T,
           typename enable_if<traits::is_optional<T>>::type>
           : mpl::identity<optional_attribute> {};

template <typename T>
struct attribute_category<T,
           typename enable_if<traits::is_range<T>>::type>
           : mpl::identity<range_attribute> {};

template <typename T>
struct attribute_category< T
    , typename enable_if<
    mpl::and_<
    traits::is_container<T>
    , mpl::not_<fusion::traits::is_sequence<T> >
    , mpl::not_<traits::is_range<T> >
    > >::type >
    : mpl::identity<container_attribute> {};

}
}
}
}

#endif
