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/*=============================================================================
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_IS_SUBSTITUTE_JAN_9_2012_1049PM)
#define BOOST_SPIRIT_X3_IS_SUBSTITUTE_JAN_9_2012_1049PM
#if defined(_MSC_VER)
#pragma once
#endif
#include <boost/spirit/home/x3/support/traits/container_traits.hpp>
#include <boost/fusion/include/is_sequence.hpp>
#include <boost/fusion/include/map.hpp>
#include <boost/fusion/include/value_at_key.hpp>
#include <boost/fusion/adapted/mpl.hpp>
#include <boost/mpl/placeholders.hpp>
#include <boost/mpl/equal.hpp>
#include <boost/mpl/apply.hpp>
#include <boost/mpl/filter_view.hpp>
#include <boost/mpl/size.hpp>
#include <boost/mpl/logical.hpp>
#include <boost/mpl/at.hpp>
#include <boost/mpl/count_if.hpp>
#include <boost/utility/enable_if.hpp>
#include <boost/optional/optional.hpp>
#include <boost/type_traits/is_same.hpp>
namespace boost { namespace spirit { namespace x3 { namespace traits
{
///////////////////////////////////////////////////////////////////////////
// Find out if T can be a (strong) substitute for Attribute
///////////////////////////////////////////////////////////////////////////
template <typename T, typename Attribute, typename Enable = void>
struct is_substitute;
template <typename Variant, typename Attribute>
struct variant_has_substitute;
namespace detail
{
template <typename T, typename Attribute>
struct value_type_is_substitute
: is_substitute<
typename container_value<T>::type
, typename container_value<Attribute>::type>
{};
template <typename T, typename Attribute, typename Enable = void>
struct is_substitute_impl : is_same<T, Attribute> {};
template <typename T, typename Attribute>
struct is_substitute_impl<T, Attribute,
typename enable_if<
mpl::and_<
fusion::traits::is_sequence<T>,
fusion::traits::is_sequence<Attribute>,
mpl::equal<T, Attribute, is_substitute<mpl::_1, mpl::_2>>
>
>::type>
: mpl::true_ {};
template <typename T, typename Attribute>
struct is_substitute_impl<T, Attribute,
typename enable_if<
mpl::and_<
is_container<T>,
is_container<Attribute>,
value_type_is_substitute<T, Attribute>
>
>::type>
: mpl::true_ {};
template <typename T, typename Attribute>
struct is_substitute_impl<T, Attribute,
typename enable_if<
is_variant<Attribute>
>::type>
: mpl::or_<
is_same<T, Attribute>
, variant_has_substitute<Attribute, T>
>
{};
}
template <typename T, typename Attribute, typename Enable /*= void*/>
struct is_substitute
: detail::is_substitute_impl<T, Attribute> {};
// for reference T
template <typename T, typename Attribute, typename Enable>
struct is_substitute<T&, Attribute, Enable>
: is_substitute<T, Attribute, Enable> {};
// for reference Attribute
template <typename T, typename Attribute, typename Enable>
struct is_substitute<T, Attribute&, Enable>
: is_substitute<T, Attribute, Enable> {};
// 2 element mpl tuple is compatible with fusion::map if:
// - it's first element type is existing key in map
// - it second element type is compatible to type stored at the key in map
template <typename T, typename Attribute>
struct is_substitute<T, Attribute
, typename enable_if<
typename mpl::eval_if<
mpl::and_<fusion::traits::is_sequence<T>
, fusion::traits::is_sequence<Attribute>>
, mpl::and_<traits::has_size<T, 2>
, fusion::traits::is_associative<Attribute>>
, mpl::false_>::type>::type>
{
// checking that "p_key >> p_value" parser can
// store it's result in fusion::map attribute
typedef typename mpl::at_c<T, 0>::type p_key;
typedef typename mpl::at_c<T, 1>::type p_value;
// for simple p_key type we just check that
// such key can be found in attr and that value under that key
// matches p_value
template <typename Key, typename Value, typename Map>
struct has_kv_in_map
: mpl::eval_if<
fusion::result_of::has_key<Map, Key>
, mpl::apply<
is_substitute<
fusion::result_of::value_at_key<mpl::_1, Key>
, Value>
, Map>
, mpl::false_>
{};
// if p_key is variant over multiple types (as a result of
// "(key1|key2|key3) >> p_value" parser) check that all
// keys are found in fusion::map attribute and that values
// under these keys match p_value
template <typename Variant>
struct variant_kv
: mpl::equal_to<
mpl::size< typename Variant::types>
, mpl::size< mpl::filter_view<typename Variant::types
, has_kv_in_map<mpl::_1, p_value, Attribute>>>
>
{};
typedef typename
mpl::eval_if<
is_variant<p_key>
, variant_kv<p_key>
, has_kv_in_map<p_key, p_value, Attribute>
>::type
type;
};
template <typename T, typename Attribute>
struct is_substitute<optional<T>, optional<Attribute>>
: is_substitute<T, Attribute> {};
}}}}
#endif
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