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

// assert_bol_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_ASSERT_BOL_MATCHER_HPP_EAN_10_04_2005

#define BOOST_XPRESSIVE_DETAIL_CORE_MATCHER_ASSERT_BOL_MATCHER_HPP_EAN_10_04_2005



// MS compatible compilers support #pragma once

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

# pragma once

#endif



#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/core/matcher/assert_line_base.hpp>



namespace boost { namespace xpressive { namespace detail

{



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

    // assert_bol_matcher

    //

    template<typename Traits>

    struct assert_bol_matcher

      : assert_line_base<Traits>

    {

        assert_bol_matcher(Traits const &traits)

          : assert_line_base<Traits>(traits)

        {

        }



        template<typename BidiIter, typename Next>

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

        {

            if(state.bos())

            {

                if(!state.flags_.match_bol_)

                {

                    return false;

                }

            }

            else if(!this->is_line_break(state))

            {

                return false;

            }



            return next.match(state);

        }

    };



}}}



#endif

