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

// end_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_END_MATCHER_HPP_EAN_10_04_2005

#define BOOST_XPRESSIVE_DETAIL_CORE_MATCHER_END_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/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/sub_match_impl.hpp>

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



namespace boost { namespace xpressive { namespace detail

{



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

    // end_matcher

    //

    struct end_matcher

      : quant_style_assertion

    {

        template<typename BidiIter, typename Next>

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

        {

            BidiIter const tmp = state.cur_;

            sub_match_impl<BidiIter> &s0 = state.sub_match(0);

            BOOST_ASSERT(!s0.matched);



            // SPECIAL: if there is a match context on the context stack, then

            // this pattern has been nested within another. pop that context and

            // continue executing.

            if(0 != state.context_.prev_context_)

            {

                if(!pop_context_match(state))

                {

                    return false;

                }



                // record the end of sub-match zero

                s0.first = s0.begin_;

                s0.second = tmp;

                s0.matched = true;



                return true;

            }

            else if((state.flags_.match_all_ && !state.eos()) ||

                    (state.flags_.match_not_null_ && state.cur_ == s0.begin_))

            {

                return false;

            }



            // record the end of sub-match zero

            s0.first = s0.begin_;

            s0.second = tmp;

            s0.matched = true;



            // Now execute any actions that have been queued

            for(actionable const *actor = state.action_list_.next; 0 != actor; actor = actor->next)

            {

                actor->execute(state.action_args_);

            }



            return true;

        }

    };



}}}



#endif

