ceph/src/boost/libs/xpressive/include/boost/xpressive/detail/core/matcher/assert_eol_matcher.hpp

   1 ///////////////////////////////////////////////////////////////////////////////
   2 // assert_eol_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_ASSERT_EOL_MATCHER_HPP_EAN_10_04_2005
   9 #define BOOST_XPRESSIVE_DETAIL_CORE_MATCHER_ASSERT_EOL_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/next_prior.hpp>
  17 #include <boost/xpressive/detail/detail_fwd.hpp>
  18 #include <boost/xpressive/detail/core/quant_style.hpp>
  19 #include <boost/xpressive/detail/core/state.hpp>
  20 #include <boost/xpressive/detail/core/matcher/assert_line_base.hpp>
  21
  22 namespace boost { namespace xpressive { namespace detail
  23 {
  24
  25     ///////////////////////////////////////////////////////////////////////////////
  26     // assert_eol_matcher
  27     //
  28     template<typename Traits>
  29     struct assert_eol_matcher
  30       : assert_line_base<Traits>
  31     {
  32         typedef typename Traits::char_type char_type;
  33
  34         assert_eol_matcher(Traits const &tr)
  35           : assert_line_base<Traits>(tr)
  36         {
  37         }
  38
  39         template<typename BidiIter, typename Next>
  40         bool match(match_state<BidiIter> &state, Next const &next) const
  41         {
  42             if(state.eos())
  43             {
  44                 if(!state.flags_.match_eol_)
  45                 {
  46                     return false;
  47                 }
  48             }
  49             else
  50             {
  51                 char_type ch = *state.cur_;
  52
  53                 // If the current character is not a newline, we're not at the end of a line
  54                 if(!traits_cast<Traits>(state).isctype(ch, this->newline_))
  55                 {
  56                     return false;
  57                 }
  58                 // There is no line-break between \r and \n
  59                 else if(ch == this->nl_ && (!state.bos() || state.flags_.match_prev_avail_) && *boost::prior(state.cur_) == this->cr_)
  60                 {
  61                     return false;
  62                 }
  63             }
  64
  65             return next.match(state);
  66         }
  67     };
  68
  69 }}}
  70
  71 #endif