1 ///////////////////////////////////////////////////////////////////////////////
2 // mark_end_matcher.hpp
3 //
4 //  Copyright 2008 Eric Niebler. Distributed under the Boost
5 //  Software License, Version 1.0. (See accompanying file
6 //  LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
7 
8 #ifndef BOOST_XPRESSIVE_DETAIL_CORE_MATCHER_MARK_END_MATCHER_HPP_EAN_10_04_2005
9 #define BOOST_XPRESSIVE_DETAIL_CORE_MATCHER_MARK_END_MATCHER_HPP_EAN_10_04_2005
10 
11 // MS compatible compilers support #pragma once
12 #if defined(_MSC_VER)
13 # pragma once
14 #endif
15 
16 #include <boost/xpressive/detail/detail_fwd.hpp>
17 #include <boost/xpressive/detail/core/quant_style.hpp>
18 #include <boost/xpressive/detail/core/state.hpp>
19 
20 namespace boost { namespace xpressive { namespace detail
21 {
22 
23     ///////////////////////////////////////////////////////////////////////////////
24     // mark_end_matcher
25     //
26     struct mark_end_matcher
27       : quant_style<quant_none, 0, false>
28     {
29         int mark_number_;
30 
mark_end_matcherboost::xpressive::detail::mark_end_matcher31         mark_end_matcher(int mark_number)
32           : mark_number_(mark_number)
33         {
34         }
35 
36         template<typename BidiIter, typename Next>
matchboost::xpressive::detail::mark_end_matcher37         bool match(match_state<BidiIter> &state, Next const &next) const
38         {
39             sub_match_impl<BidiIter> &br = state.sub_match(this->mark_number_);
40 
41             BidiIter old_first = br.first;
42             BidiIter old_second = br.second;
43             bool old_matched = br.matched;
44 
45             br.first = br.begin_;
46             br.second = state.cur_;
47             br.matched = true;
48 
49             if(next.match(state))
50             {
51                 return true;
52             }
53 
54             br.first = old_first;
55             br.second = old_second;
56             br.matched = old_matched;
57 
58             return false;
59         }
60     };
61 
62 }}}
63 
64 #endif
65