libstdc++
regex_grep_matcher.h
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1 // class template regex -*- C++ -*-
2 
3 // Copyright (C) 2010, 2011 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 namespace std _GLIBCXX_VISIBILITY(default)
32 {
33 _GLIBCXX_BEGIN_NAMESPACE_VERSION
34 
35  template<typename _BiIter>
36  class sub_match;
37 
38  template<typename _Bi_iter, typename _Allocator>
39  class match_results;
40 
41 _GLIBCXX_END_NAMESPACE_VERSION
42 
43 namespace __regex
44 {
45 _GLIBCXX_BEGIN_NAMESPACE_VERSION
46 
47  // A _Results facade specialized for wrapping a templated match_results.
48  template<typename _FwdIterT, typename _Alloc>
49  class _SpecializedResults
50  : public _Results
51  {
52  public:
53  _SpecializedResults(const _Automaton::_SizeT __size,
54  const _SpecializedCursor<_FwdIterT>& __cursor,
55  match_results<_FwdIterT, _Alloc>& __m);
56 
57  void
58  _M_set_pos(int __i, int __j, const _PatternCursor& __pc);
59 
60  void
61  _M_set_matched(int __i, bool __is_matched)
62  { _M_results.at(__i).matched = __is_matched; }
63 
64  private:
65  match_results<_FwdIterT, _Alloc>& _M_results;
66  };
67 
68  template<typename _FwdIterT, typename _Alloc>
69  _SpecializedResults<_FwdIterT, _Alloc>::
70  _SpecializedResults(const _Automaton::_SizeT __size,
71  const _SpecializedCursor<_FwdIterT>& __cursor,
72  match_results<_FwdIterT, _Alloc>& __m)
73  : _M_results(__m)
74  {
75  _M_results.clear();
76  _M_results.reserve(__size + 2);
77  _M_results.resize(__size);
78  typename match_results<_FwdIterT, _Alloc>::value_type __sm;
79  __sm.first = __sm.second = __cursor._M_begin();
80  _M_results.push_back(__sm);
81  __sm.first = __sm.second = __cursor._M_end();
82  _M_results.push_back(__sm);
83  }
84 
85  template<typename _FwdIterT, typename _Alloc>
86  void
87  _SpecializedResults<_FwdIterT, _Alloc>::
88  _M_set_pos(int __i, int __j, const _PatternCursor& __pc)
89  {
90  typedef const _SpecializedCursor<_FwdIterT>& _CursorT;
91  _CursorT __c = static_cast<_CursorT>(__pc);
92  if (__j == 0)
93  _M_results.at(__i).first = __c._M_pos();
94  else
95  _M_results.at(__i).second = __c._M_pos()+1;
96  }
97 
98  // A stack of states used in evaluating the NFA.
100 
101  // Executes a regular expression NFA/DFA over a range using a variant of
102  // the parallel execution algorithm featured in the grep utility, modified
103  // to use Laurikari tags.
104  class _Grep_matcher
105  {
106  public:
107  _Grep_matcher(_PatternCursor& __p,
108  _Results& __r,
109  const _AutomatonPtr& __automaton,
111 
112  private:
113  _StateSet
114  _M_e_closure(_StateIdT __i);
115 
116  _StateSet
117  _M_e_closure(const _StateSet& __s);
118 
119  _StateSet
120  _M_e_closure(_StateStack& __stack, const _StateSet& __s);
121 
122  private:
123  const std::shared_ptr<_Nfa> _M_nfa;
124  _PatternCursor& _M_pattern;
125  _Results& _M_results;
126  };
127 
128 _GLIBCXX_END_NAMESPACE_VERSION
129 } // namespace __regex
130 } // namespace
131 
A standard container giving FILO behavior.
Definition: stl_stack.h:95
std::bitset< _S_match_flag_last > match_flag_type
This is a bitmask type indicating regex matching rules.