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// Copyright (c) 2001-2011 Hartmut Kaiser
// 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_LEX_META_COMPILER_APR_20_2009_0756PM)
#define BOOST_SPIRIT_LEX_META_COMPILER_APR_20_2009_0756PM
#if defined(_MSC_VER)
#pragma once
#endif
#include <boost/spirit/home/support/meta_compiler.hpp>
#include <boost/spirit/home/lex/domain.hpp>
#include <boost/spirit/home/lex/lexer_type.hpp>
#include <boost/type_traits/remove_reference.hpp>
#include <boost/utility/enable_if.hpp>
namespace boost { namespace spirit
{
template <typename T>
struct use_terminal<lex::domain, T
, typename enable_if<traits::is_lexer<T> >::type> // enables lexers
: mpl::true_ {};
namespace lex
{
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;
}
// Lex primitive meta-compiler
template <>
struct make_component<lex::domain, proto::tag::terminal>
{
template <typename Sig>
struct result;
template <typename This, typename Elements, typename Modifiers>
struct result<This(Elements, Modifiers)>
{
typedef typename lex::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 lex::make_primitive<term, Modifiers>()(elements.car, modifiers);
}
};
// Lex composite meta-compiler
template <typename Tag>
struct make_component<lex::domain, Tag>
{
template <typename Sig>
struct result;
template <typename This, typename Elements, typename Modifiers>
struct result<This(Elements, Modifiers)>
{
typedef typename
lex::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 lex::make_composite<Tag, Elements, Modifiers>()(
elements, modifiers);
}
};
}}
#endif
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