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/*=============================================================================
Copyright (c) 2001-2011 Joel de Guzman
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_META_COMPILER_OCTOBER_16_2008_0347PM)
#define BOOST_SPIRIT_META_COMPILER_OCTOBER_16_2008_0347PM
#if defined(_MSC_VER)
#pragma once
#endif
#include <boost/spirit/home/support/meta_compiler.hpp>
#include <boost/spirit/home/qi/domain.hpp>
#include <boost/spirit/home/qi/parser.hpp>
#include <boost/spirit/home/support/string_traits.hpp>
#include <boost/proto/tags.hpp>
#include <boost/type_traits/remove_reference.hpp>
#include <boost/utility/enable_if.hpp>
#include <boost/fusion/include/at.hpp>
namespace boost { namespace spirit
{
template <typename T>
struct use_terminal<qi::domain, T
, typename enable_if<traits::is_parser<T> >::type> // enables parsers
: mpl::true_ {};
namespace qi
{
template <typename T, typename Modifiers, typename Enable = void>
struct make_primitive // by default, return it as-is
{
typedef T result_type;
template <typename T_>
T_& operator()(T_& val, unused_type) const
{
return val;
}
template <typename T_>
T_ const& operator()(T_ const& val, unused_type) const
{
return val;
}
};
template <typename Tag, typename Elements
, typename Modifiers, typename Enable = void>
struct make_composite;
template <typename Directive, typename Body
, typename Modifiers, typename Enable = void>
struct make_directive
{
typedef Body result_type;
result_type operator()(unused_type, Body const& body, unused_type) const
{
return body; // By default, a directive simply returns its subject
}
};
}
// Qi primitive meta-compiler
template <>
struct make_component<qi::domain, proto::tag::terminal>
{
template <typename Sig>
struct result;
template <typename This, typename Elements, typename Modifiers>
struct result<This(Elements, Modifiers)>
{
typedef typename qi::make_primitive<
typename remove_const<typename Elements::car_type>::type,
typename remove_reference<Modifiers>::type>::result_type
type;
};
template <typename Elements, typename Modifiers>
typename result<make_component(Elements, Modifiers)>::type
operator()(Elements const& elements, Modifiers const& modifiers) const
{
typedef typename remove_const<typename Elements::car_type>::type term;
return qi::make_primitive<term, Modifiers>()(elements.car, modifiers);
}
};
// Qi composite meta-compiler
template <typename Tag>
struct make_component<qi::domain, Tag>
{
template <typename Sig>
struct result;
template <typename This, typename Elements, typename Modifiers>
struct result<This(Elements, Modifiers)>
{
typedef typename
qi::make_composite<Tag, Elements,
typename remove_reference<Modifiers>::type>::result_type
type;
};
template <typename Elements, typename Modifiers>
typename result<make_component(Elements, Modifiers)>::type
operator()(Elements const& elements, Modifiers const& modifiers) const
{
return qi::make_composite<Tag, Elements, Modifiers>()(
elements, modifiers);
}
};
// Qi function meta-compiler
template <>
struct make_component<qi::domain, proto::tag::function>
{
template <typename Sig>
struct result;
template <typename This, typename Elements, typename Modifiers>
struct result<This(Elements, Modifiers)>
{
typedef typename
qi::make_composite<
typename remove_const<typename Elements::car_type>::type,
typename Elements::cdr_type,
typename remove_reference<Modifiers>::type
>::result_type
type;
};
template <typename Elements, typename Modifiers>
typename result<make_component(Elements, Modifiers)>::type
operator()(Elements const& elements, Modifiers const& modifiers) const
{
return qi::make_composite<
typename remove_const<typename Elements::car_type>::type,
typename Elements::cdr_type,
Modifiers>()(elements.cdr, modifiers);
}
};
// Qi directive meta-compiler
template <>
struct make_component<qi::domain, tag::directive>
{
template <typename Sig>
struct result;
template <typename This, typename Elements, typename Modifiers>
struct result<This(Elements, Modifiers)>
{
typedef typename
qi::make_directive<
typename remove_const<typename Elements::car_type>::type,
typename remove_const<typename Elements::cdr_type::car_type>::type,
typename remove_reference<Modifiers>::type
>::result_type
type;
};
template <typename Elements, typename Modifiers>
typename result<make_component(Elements, Modifiers)>::type
operator()(Elements const& elements, Modifiers const& modifiers) const
{
return qi::make_directive<
typename remove_const<typename Elements::car_type>::type,
typename remove_const<typename Elements::cdr_type::car_type>::type,
Modifiers>()(elements.car, elements.cdr.car, modifiers);
}
};
}}
#endif
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