///////////////////////////////////////////////////////////////////////////////

// posix_charset_matcher.hpp

//

//  Copyright 2007 Eric Niebler. 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)



#ifndef BOOST_XPRESSIVE_DETAIL_CORE_MATCHER_POSIX_CHARSET_MATCHER_HPP_EAN_10_04_2005

#define BOOST_XPRESSIVE_DETAIL_CORE_MATCHER_POSIX_CHARSET_MATCHER_HPP_EAN_10_04_2005



// MS compatible compilers support #pragma once

#if defined(_MSC_VER) && (_MSC_VER >= 1020)

# pragma once

#endif



#include <boost/assert.hpp>

#include <boost/mpl/bool.hpp>

#include <boost/xpressive/detail/detail_fwd.hpp>

#include <boost/xpressive/detail/core/quant_style.hpp>

#include <boost/xpressive/detail/core/state.hpp>

#include <boost/xpressive/detail/utility/traits_utils.hpp>



namespace boost { namespace xpressive { namespace detail

{



    ///////////////////////////////////////////////////////////////////////////////

    // posix_charset_matcher

    //

    template<typename Traits>

    struct posix_charset_matcher

      : quant_style_fixed_width<1>

    {

        typedef Traits traits_type;

        typedef typename Traits::char_class_type char_class_type;



        posix_charset_matcher(char_class_type m, bool no)

          : not_(no)

          , mask_(m)

        {

            BOOST_ASSERT(0 != this->mask_);

        }



        void inverse()

        {

            this->not_ = !this->not_;

        }



        template<typename BidiIter, typename Next>

        bool match(match_state<BidiIter> &state, Next const &next) const

        {

            if(state.eos() || this->not_ == traits_cast<Traits>(state).isctype(

                *state.cur_, this->mask_))

            {

                return false;

            }



            ++state.cur_;

            if(next.match(state))

            {

                return true;

            }



            --state.cur_;

            return false;

        }



        bool not_;

        char_class_type mask_;

    };



}}}



#endif

