Chris@16: //  Copyright (c) 2001-2011 Hartmut Kaiser
Chris@16: //  Copyright (c) 2001-2011 Joel de Guzman
Chris@16: // 
Chris@16: //  Distributed under the Boost Software License, Version 1.0. (See accompanying 
Chris@16: //  file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
Chris@16: 
Chris@16: #if !defined(BOOST_SPIRIT_LEX_META_COMPILER_APR_20_2009_0756PM)
Chris@16: #define BOOST_SPIRIT_LEX_META_COMPILER_APR_20_2009_0756PM
Chris@16: 
Chris@16: #if defined(_MSC_VER)
Chris@16: #pragma once
Chris@16: #endif
Chris@16: 
Chris@16: #include <boost/spirit/home/support/meta_compiler.hpp>
Chris@16: #include <boost/spirit/home/lex/domain.hpp>
Chris@16: #include <boost/spirit/home/lex/lexer_type.hpp>
Chris@16: #include <boost/type_traits/remove_reference.hpp>
Chris@16: #include <boost/utility/enable_if.hpp>
Chris@16: 
Chris@16: namespace boost { namespace spirit
Chris@16: {
Chris@16:     template <typename T>
Chris@16:     struct use_terminal<lex::domain, T
Chris@16:       , typename enable_if<traits::is_lexer<T> >::type> // enables lexers
Chris@16:       : mpl::true_ {};
Chris@16: 
Chris@16:     namespace lex
Chris@16:     {
Chris@16:         template <typename T, typename Modifiers, typename Enable = void>
Chris@16:         struct make_primitive // by default, return it as-is
Chris@16:         {
Chris@16:             typedef T result_type;
Chris@16: 
Chris@16:             template <typename T_>
Chris@16:             T_& operator()(T_& val, unused_type) const
Chris@16:             {
Chris@16:                 return val;
Chris@16:             }
Chris@16: 
Chris@16:             template <typename T_>
Chris@16:             T_ const& operator()(T_ const& val, unused_type) const
Chris@16:             {
Chris@16:                 return val;
Chris@16:             }
Chris@16:         };
Chris@16: 
Chris@16:         template <typename Tag, typename Elements
Chris@16:           , typename Modifiers, typename Enable = void>
Chris@16:         struct make_composite;
Chris@16:     }
Chris@16: 
Chris@16:     // Lex primitive meta-compiler
Chris@16:     template <>
Chris@16:     struct make_component<lex::domain, proto::tag::terminal>
Chris@16:     {
Chris@16:         template <typename Sig>
Chris@16:         struct result;
Chris@16: 
Chris@16:         template <typename This, typename Elements, typename Modifiers>
Chris@16:         struct result<This(Elements, Modifiers)>
Chris@16:         {
Chris@16:             typedef typename lex::make_primitive<
Chris@16:                 typename remove_const<typename Elements::car_type>::type,
Chris@16:                 typename remove_reference<Modifiers>::type>::result_type
Chris@16:             type;
Chris@16:         };
Chris@16: 
Chris@16:         template <typename Elements, typename Modifiers>
Chris@16:         typename result<make_component(Elements, Modifiers)>::type
Chris@16:         operator()(Elements const& elements, Modifiers const& modifiers) const
Chris@16:         {
Chris@16:             typedef typename remove_const<typename Elements::car_type>::type term;
Chris@16:             return lex::make_primitive<term, Modifiers>()(elements.car, modifiers);
Chris@16:         }
Chris@16:     };
Chris@16: 
Chris@16:     // Lex composite meta-compiler
Chris@16:     template <typename Tag>
Chris@16:     struct make_component<lex::domain, Tag>
Chris@16:     {
Chris@16:         template <typename Sig>
Chris@16:         struct result;
Chris@16: 
Chris@16:         template <typename This, typename Elements, typename Modifiers>
Chris@16:         struct result<This(Elements, Modifiers)>
Chris@16:         {
Chris@16:             typedef typename
Chris@16:                 lex::make_composite<Tag, Elements
Chris@16:                   , typename remove_reference<Modifiers>::type>::result_type
Chris@16:             type;
Chris@16:         };
Chris@16: 
Chris@16:         template <typename Elements, typename Modifiers>
Chris@16:         typename result<make_component(Elements, Modifiers)>::type
Chris@16:         operator()(Elements const& elements, Modifiers const& modifiers) const
Chris@16:         {
Chris@16:             return lex::make_composite<Tag, Elements, Modifiers>()(
Chris@16:                 elements, modifiers);
Chris@16:         }
Chris@16:     };
Chris@16: 
Chris@16: }}
Chris@16: 
Chris@16: #endif