libstdc++-v3/include/bits/regex_grep_matcher.h

   1 // class template regex -*- C++ -*-
   2
   3 // Copyright (C) 2010 Free Software Foundation, Inc.
   4 //
   5 // This file is part of the GNU ISO C++ Library.  This library is free
   6 // software; you can redistribute it and/or modify it under the
   7 // terms of the GNU General Public License as published by the
   8 // Free Software Foundation; either version 3, or (at your option)
   9 // any later version.
  10
  11 // This library is distributed in the hope that it will be useful,
  12 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 // GNU General Public License for more details.
  15
  16 // Under Section 7 of GPL version 3, you are granted additional
  17 // permissions described in the GCC Runtime Library Exception, version
  18 // 3.1, as published by the Free Software Foundation.
  19
  20 // You should have received a copy of the GNU General Public License and
  21 // a copy of the GCC Runtime Library Exception along with this program;
  22 // see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
  23 // <http://www.gnu.org/licenses/>.
  24
  25 /**
  26  *  @file bits/regex_grep_matcher.h
  27  *  This is an internal header file, included by other library headers.
  28  *  Do not attempt to use it directly. @headername{regex}
  29  */
  30
  31 _GLIBCXX_BEGIN_NAMESPACE(std)
  32
  33   template<typename _BiIter>
  34     class sub_match;
  35
  36   template<typename _Bi_iter, typename _Allocator>
  37     class match_results;
  38
  39 namespace __regex
  40 {
  41   // A _Results facade specialized for wrapping a templated sub_match.
  42   template<typename _FwdIterT, typename _Alloc>
  43     class _SpecializedResults
  44     : public _Results
  45     {
  46     public:
  47       _SpecializedResults(const _Automaton::_SizeT __size,
  48                           const _SpecializedCursor<_FwdIterT>& __cursor,
  49                           match_results<_FwdIterT, _Alloc>& __m);
  50
  51       void
  52       _M_set_pos(int __i, int __j, const _PatternCursor& __pc);
  53
  54       void
  55       _M_set_matched(int __i, bool __is_matched)
  56       { _M_results.at(__i).matched = __is_matched; }
  57
  58     private:
  59       match_results<_FwdIterT, _Alloc>& _M_results;
  60     };
  61
  62   template<typename _FwdIterT, typename _Alloc>
  63     _SpecializedResults<_FwdIterT, _Alloc>::
  64     _SpecializedResults(const _Automaton::_SizeT __size,
  65                         const _SpecializedCursor<_FwdIterT>& __cursor,
  66                         match_results<_FwdIterT, _Alloc>& __m)
  67     : _M_results(__m)
  68     {
  69       typedef typename match_results<_FwdIterT, _Alloc>::size_type size_type;
  70       _M_results.clear();
  71       std::sub_match<_FwdIterT> __sm;
  72       __sm.matched = false;
  73       size_type __result_count = __size + 2;
  74       for (size_type __i = 0; __i < __result_count; ++__i)
  75         _M_results.push_back(__sm);
  76       _M_results.at(__size+0).first = __cursor._M_begin();
  77       _M_results.at(__size+0).second = __cursor._M_begin();
  78       _M_results.at(__size+1).first = __cursor._M_end();
  79       _M_results.at(__size+1).second = __cursor._M_end();
  80     }
  81
  82   template<typename _FwdIterT, typename _Alloc>
  83     void
  84     _SpecializedResults<_FwdIterT, _Alloc>::
  85     _M_set_pos(int __i, int __j, const _PatternCursor& __pc)
  86     {
  87       typedef const _SpecializedCursor<_FwdIterT>& _CursorT;
  88       _CursorT __c = static_cast<_CursorT>(__pc);
  89       if (__j == 0)
  90         _M_results.at(__i).first = __c._M_pos();
  91       else
  92         _M_results.at(__i).second = __c._M_pos()+1;
  93     }
  94
  95   // A stack of states used in evaluating the NFA.
  96   typedef std::stack<_StateIdT, std::vector<_StateIdT> > _StateStack;
  97
  98   // Executes a regular expression NFA/DFA over a range using a variant of
  99   // the parallel execution algorithm featured in the grep utility, modified
 100   // to use Laurikari tags.
 101   class _Grep_matcher
 102   {
 103   public:
 104     _Grep_matcher(_PatternCursor&                   __p,
 105                   _Results&                         __r,
 106                   const _AutomatonPtr&              __automaton,
 107                   regex_constants::match_flag_type  __flags);
 108
 109   private:
 110     _StateSet
 111     _M_e_closure(_StateIdT __i);
 112
 113     _StateSet
 114     _M_e_closure(const _StateSet& __s);
 115
 116     _StateSet
 117     _M_e_closure(_StateStack& __stack, const _StateSet& __s);
 118
 119   private:
 120     const std::shared_ptr<_Nfa>        _M_nfa;
 121     _PatternCursor&                    _M_pattern;
 122     _Results&                          _M_results;
 123   };
 124
 125 } // namespace __regex
 126
 127 _GLIBCXX_END_NAMESPACE
 128
 129 #include <bits/regex_grep_matcher.tcc>