aboutsummaryrefslogtreecommitdiff
path: root/cutl/details/boost/regex/v4/perl_matcher_common.hpp
blob: e5dbfd2c5c8e456535ae0c126b55eb248cdb886b (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
/*
 *
 * Copyright (c) 2002
 * John Maddock
 *
 * Use, modification and distribution are subject to 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)
 *
 */

 /*
  *   LOCATION:    see http://www.boost.org for most recent version.
  *   FILE         perl_matcher_common.cpp
  *   VERSION      see <cutl/details/boost/version.hpp>
  *   DESCRIPTION: Definitions of perl_matcher member functions that are 
  *                common to both the recursive and non-recursive versions.
  */

#ifndef BOOST_REGEX_V4_PERL_MATCHER_COMMON_HPP
#define BOOST_REGEX_V4_PERL_MATCHER_COMMON_HPP

#ifdef BOOST_MSVC
#pragma warning(push)
#pragma warning(disable: 4103)
#endif
#ifdef BOOST_HAS_ABI_HEADERS
#  include BOOST_ABI_PREFIX
#endif
#ifdef BOOST_MSVC
#pragma warning(pop)
#endif

#ifdef __BORLANDC__
#  pragma option push -w-8008 -w-8066
#endif
#ifdef BOOST_MSVC
#  pragma warning(push)
#  pragma warning(disable: 4800)
#endif

namespace cutl_details_boost{
namespace re_detail{

template <class BidiIterator, class Allocator, class traits>
void perl_matcher<BidiIterator, Allocator, traits>::construct_init(const basic_regex<char_type, traits>& e, match_flag_type f)
{ 
   typedef typename regex_iterator_traits<BidiIterator>::iterator_category category;
   typedef typename basic_regex<char_type, traits>::flag_type expression_flag_type;
   
   if(e.empty())
   {
      // precondition failure: e is not a valid regex.
      std::invalid_argument ex("Invalid regular expression object");
      cutl_details_boost::throw_exception(ex);
   }
   pstate = 0;
   m_match_flags = f;
   estimate_max_state_count(static_cast<category*>(0));
   expression_flag_type re_f = re.flags();
   icase = re_f & regex_constants::icase;
   if(!(m_match_flags & (match_perl|match_posix)))
   {
      if((re_f & (regbase::main_option_type|regbase::no_perl_ex)) == 0)
         m_match_flags |= match_perl;
      else if((re_f & (regbase::main_option_type|regbase::emacs_ex)) == (regbase::basic_syntax_group|regbase::emacs_ex))
         m_match_flags |= match_perl;
      else if((re_f & (regbase::main_option_type|regbase::literal)) == (regbase::literal))
         m_match_flags |= match_perl;
      else
         m_match_flags |= match_posix;
   }
   if(m_match_flags & match_posix)
   {
      m_temp_match.reset(new match_results<BidiIterator, Allocator>());
      m_presult = m_temp_match.get();
   }
   else
      m_presult = &m_result;
#ifdef BOOST_REGEX_NON_RECURSIVE
   m_stack_base = 0;
   m_backup_state = 0;
#endif
   // find the value to use for matching word boundaries:
   m_word_mask = re.get_data().m_word_mask; 
   // find bitmask to use for matching '.':
   match_any_mask = static_cast<unsigned char>((f & match_not_dot_newline) ? re_detail::test_not_newline : re_detail::test_newline);
}

template <class BidiIterator, class Allocator, class traits>
void perl_matcher<BidiIterator, Allocator, traits>::estimate_max_state_count(std::random_access_iterator_tag*)
{
   //
   // How many states should we allow our machine to visit before giving up?
   // This is a heuristic: it takes the greater of O(N^2) and O(NS^2)
   // where N is the length of the string, and S is the number of states
   // in the machine.  It's tempting to up this to O(N^2S) or even O(N^2S^2)
   // but these take unreasonably amounts of time to bale out in pathological
   // cases.
   //
   // Calculate NS^2 first:
   //
   static const std::ptrdiff_t k = 100000;
   std::ptrdiff_t dist = cutl_details_boost::re_detail::distance(base, last);
   if(dist == 0)
      dist = 1;
   std::ptrdiff_t states = re.size();
   if(states == 0)
      states = 1;
   states *= states;
   if((std::numeric_limits<std::ptrdiff_t>::max)() / dist < states)
   {
      max_state_count = (std::min)((std::ptrdiff_t)BOOST_REGEX_MAX_STATE_COUNT, (std::numeric_limits<std::ptrdiff_t>::max)() - 2);
      return;
   }
   states *= dist;
   if((std::numeric_limits<std::ptrdiff_t>::max)() - k < states)
   {
      max_state_count = (std::min)((std::ptrdiff_t)BOOST_REGEX_MAX_STATE_COUNT, (std::numeric_limits<std::ptrdiff_t>::max)() - 2);
      return;
   }
   states += k;

   max_state_count = states;

   //
   // Now calculate N^2:
   //
   states = dist;
   if((std::numeric_limits<std::ptrdiff_t>::max)() / dist < states)
   {
      max_state_count = (std::min)((std::ptrdiff_t)BOOST_REGEX_MAX_STATE_COUNT, (std::numeric_limits<std::ptrdiff_t>::max)() - 2);
      return;
   }
   states *= dist;
   if((std::numeric_limits<std::ptrdiff_t>::max)() - k < states)
   {
      max_state_count = (std::min)((std::ptrdiff_t)BOOST_REGEX_MAX_STATE_COUNT, (std::numeric_limits<std::ptrdiff_t>::max)() - 2);
      return;
   }
   states += k;
   //
   // N^2 can be a very large number indeed, to prevent things getting out
   // of control, cap the max states:
   //
   if(states > BOOST_REGEX_MAX_STATE_COUNT)
      states = BOOST_REGEX_MAX_STATE_COUNT;
   //
   // If (the possibly capped) N^2 is larger than our first estimate,
   // use this instead:
   //
   if(states > max_state_count)
      max_state_count = states;
}

template <class BidiIterator, class Allocator, class traits>
inline void perl_matcher<BidiIterator, Allocator, traits>::estimate_max_state_count(void*)
{
   // we don't know how long the sequence is:
   max_state_count = BOOST_REGEX_MAX_STATE_COUNT;
}

#ifdef BOOST_REGEX_HAS_MS_STACK_GUARD
template <class BidiIterator, class Allocator, class traits>
inline bool perl_matcher<BidiIterator, Allocator, traits>::protected_call(
   protected_proc_type proc)
{
   ::cutl_details_boost::re_detail::concrete_protected_call
      <perl_matcher<BidiIterator, Allocator, traits> >
      obj(this, proc);
   return obj.execute();

}
#endif

template <class BidiIterator, class Allocator, class traits>
inline bool perl_matcher<BidiIterator, Allocator, traits>::match()
{
#ifdef BOOST_REGEX_HAS_MS_STACK_GUARD
   return protected_call(&perl_matcher<BidiIterator, Allocator, traits>::match_imp);
#else
   return match_imp();
#endif
}

template <class BidiIterator, class Allocator, class traits>
bool perl_matcher<BidiIterator, Allocator, traits>::match_imp()
{
   // initialise our stack if we are non-recursive:
#ifdef BOOST_REGEX_NON_RECURSIVE
   save_state_init init(&m_stack_base, &m_backup_state);
   used_block_count = BOOST_REGEX_MAX_BLOCKS;
#if !defined(BOOST_NO_EXCEPTIONS)
   try{
#endif
#endif

   // reset our state machine:
   position = base;
   search_base = base;
   state_count = 0;
   m_match_flags |= regex_constants::match_all;
   m_presult->set_size((m_match_flags & match_nosubs) ? 1 : re.mark_count(), search_base, last);
   m_presult->set_base(base);
   m_presult->set_named_subs(this->re.get_named_subs());
   if(m_match_flags & match_posix)
      m_result = *m_presult;
   verify_options(re.flags(), m_match_flags);
   if(0 == match_prefix())
      return false;
   return (m_result[0].second == last) && (m_result[0].first == base);

#if defined(BOOST_REGEX_NON_RECURSIVE) && !defined(BOOST_NO_EXCEPTIONS)
   }
   catch(...)
   {
      // unwind all pushed states, apart from anything else this
      // ensures that all the states are correctly destructed
      // not just the memory freed.
      while(unwind(true)){}
      throw;
   }
#endif
}

template <class BidiIterator, class Allocator, class traits>
inline bool perl_matcher<BidiIterator, Allocator, traits>::find()
{
#ifdef BOOST_REGEX_HAS_MS_STACK_GUARD
   return protected_call(&perl_matcher<BidiIterator, Allocator, traits>::find_imp);
#else
   return find_imp();
#endif
}

template <class BidiIterator, class Allocator, class traits>
bool perl_matcher<BidiIterator, Allocator, traits>::find_imp()
{
   static matcher_proc_type const s_find_vtable[7] = 
   {
      &perl_matcher<BidiIterator, Allocator, traits>::find_restart_any,
      &perl_matcher<BidiIterator, Allocator, traits>::find_restart_word,
      &perl_matcher<BidiIterator, Allocator, traits>::find_restart_line,
      &perl_matcher<BidiIterator, Allocator, traits>::find_restart_buf,
      &perl_matcher<BidiIterator, Allocator, traits>::match_prefix,
      &perl_matcher<BidiIterator, Allocator, traits>::find_restart_lit,
      &perl_matcher<BidiIterator, Allocator, traits>::find_restart_lit,
   };

   // initialise our stack if we are non-recursive:
#ifdef BOOST_REGEX_NON_RECURSIVE
   save_state_init init(&m_stack_base, &m_backup_state);
   used_block_count = BOOST_REGEX_MAX_BLOCKS;
#if !defined(BOOST_NO_EXCEPTIONS)
   try{
#endif
#endif

   state_count = 0;
   if((m_match_flags & regex_constants::match_init) == 0)
   {
      // reset our state machine:
      search_base = position = base;
      pstate = re.get_first_state();
      m_presult->set_size((m_match_flags & match_nosubs) ? 1 : re.mark_count(), base, last);
      m_presult->set_base(base);
      m_presult->set_named_subs(this->re.get_named_subs());
      m_match_flags |= regex_constants::match_init;
   }
   else
   {
      // start again:
      search_base = position = m_result[0].second;
      // If last match was null and match_not_null was not set then increment
      // our start position, otherwise we go into an infinite loop:
      if(((m_match_flags & match_not_null) == 0) && (m_result.length() == 0))
      {
         if(position == last)
            return false;
         else 
            ++position;
      }
      // reset $` start:
      m_presult->set_size((m_match_flags & match_nosubs) ? 1 : re.mark_count(), search_base, last);
      //if((base != search_base) && (base == backstop))
      //   m_match_flags |= match_prev_avail;
   }
   if(m_match_flags & match_posix)
   {
      m_result.set_size(re.mark_count(), base, last);
      m_result.set_base(base);
   }

   verify_options(re.flags(), m_match_flags);
   // find out what kind of expression we have:
   unsigned type = (m_match_flags & match_continuous) ? 
      static_cast<unsigned int>(regbase::restart_continue) 
         : static_cast<unsigned int>(re.get_restart_type());

   // call the appropriate search routine:
   matcher_proc_type proc = s_find_vtable[type];
   return (this->*proc)();

#if defined(BOOST_REGEX_NON_RECURSIVE) && !defined(BOOST_NO_EXCEPTIONS)
   }
   catch(...)
   {
      // unwind all pushed states, apart from anything else this
      // ensures that all the states are correctly destructed
      // not just the memory freed.
      while(unwind(true)){}
      throw;
   }
#endif
}

template <class BidiIterator, class Allocator, class traits>
bool perl_matcher<BidiIterator, Allocator, traits>::match_prefix()
{
   m_has_partial_match = false;
   m_has_found_match = false;
   pstate = re.get_first_state();
   m_presult->set_first(position);
   restart = position;
   match_all_states();
   if(!m_has_found_match && m_has_partial_match && (m_match_flags & match_partial))
   {
      m_has_found_match = true;
      m_presult->set_second(last, 0, false);
      position = last;
      if((m_match_flags & match_posix) == match_posix)
      {
         m_result.maybe_assign(*m_presult);
      }
   }
#ifdef BOOST_REGEX_MATCH_EXTRA
   if(m_has_found_match && (match_extra & m_match_flags))
   {
      //
      // we have a match, reverse the capture information:
      //
      for(unsigned i = 0; i < m_presult->size(); ++i)
      {
         typename sub_match<BidiIterator>::capture_sequence_type & seq = ((*m_presult)[i]).get_captures();
         std::reverse(seq.begin(), seq.end());
      }
   }
#endif
   if(!m_has_found_match)
      position = restart; // reset search postion
   return m_has_found_match;
}

template <class BidiIterator, class Allocator, class traits>
bool perl_matcher<BidiIterator, Allocator, traits>::match_literal()
{
   unsigned int len = static_cast<const re_literal*>(pstate)->length;
   const char_type* what = reinterpret_cast<const char_type*>(static_cast<const re_literal*>(pstate) + 1);
   //
   // compare string with what we stored in
   // our records:
   for(unsigned int i = 0; i < len; ++i, ++position)
   {
      if((position == last) || (traits_inst.translate(*position, icase) != what[i]))
         return false;
   }
   pstate = pstate->next.p;
   return true;
}

template <class BidiIterator, class Allocator, class traits>
bool perl_matcher<BidiIterator, Allocator, traits>::match_start_line()
{
   if(position == backstop)
   {
      if((m_match_flags & match_prev_avail) == 0)
      {
         if((m_match_flags & match_not_bol) == 0)
         {
            pstate = pstate->next.p;
            return true;
         }
         return false;
      }
   }
   else if(m_match_flags & match_single_line)
      return false;

   // check the previous value character:
   BidiIterator t(position);
   --t;
   if(position != last)
   {
      if(is_separator(*t) && !((*t == static_cast<char_type>('\r')) && (*position == static_cast<char_type>('\n'))) )
      {
         pstate = pstate->next.p;
         return true;
      }
   }
   else if(is_separator(*t))
   {
      pstate = pstate->next.p;
      return true;
   }
   return false;
}

template <class BidiIterator, class Allocator, class traits>
bool perl_matcher<BidiIterator, Allocator, traits>::match_end_line()
{
   if(position != last)
   {
      if(m_match_flags & match_single_line)
         return false;
      // we're not yet at the end so *first is always valid:
      if(is_separator(*position))
      {
         if((position != backstop) || (m_match_flags & match_prev_avail))
         {
            // check that we're not in the middle of \r\n sequence
            BidiIterator t(position);
            --t;
            if((*t == static_cast<char_type>('\r')) && (*position == static_cast<char_type>('\n')))
            {
               return false;
            }
         }
         pstate = pstate->next.p;
         return true;
      }
   }
   else if((m_match_flags & match_not_eol) == 0)
   {
      pstate = pstate->next.p;
      return true;
   }
   return false;
}

template <class BidiIterator, class Allocator, class traits>
bool perl_matcher<BidiIterator, Allocator, traits>::match_wild()
{
   if(position == last) 
      return false;
   if(is_separator(*position) && ((match_any_mask & static_cast<const re_dot*>(pstate)->mask) == 0))
      return false;
   if((*position == char_type(0)) && (m_match_flags & match_not_dot_null))
      return false;
   pstate = pstate->next.p;
   ++position;
   return true;
}

template <class BidiIterator, class Allocator, class traits>
bool perl_matcher<BidiIterator, Allocator, traits>::match_word_boundary()
{
   bool b; // indcates whether next character is a word character
   if(position != last)
   {
      // prev and this character must be opposites:
   #if defined(BOOST_REGEX_USE_C_LOCALE) && defined(__GNUC__) && (__GNUC__ == 2) && (__GNUC_MINOR__ < 95)
      b = traits::isctype(*position, m_word_mask);
   #else
      b = traits_inst.isctype(*position, m_word_mask);
   #endif
   }
   else
   {
      b = (m_match_flags & match_not_eow) ? true : false;
   }
   if((position == backstop) && ((m_match_flags & match_prev_avail) == 0))
   {
      if(m_match_flags & match_not_bow)
         b ^= true;
      else
         b ^= false;
   }
   else
   {
      --position;
      b ^= traits_inst.isctype(*position, m_word_mask);
      ++position;
   }
   if(b)
   {
      pstate = pstate->next.p;
      return true;
   }
   return false; // no match if we get to here...
}

template <class BidiIterator, class Allocator, class traits>
bool perl_matcher<BidiIterator, Allocator, traits>::match_within_word()
{
   if(position == last)
      return false;
   // both prev and this character must be m_word_mask:
   bool prev = traits_inst.isctype(*position, m_word_mask);
   {
      bool b;
      if((position == backstop) && ((m_match_flags & match_prev_avail) == 0)) 
         return false;
      else
      {
         --position;
         b = traits_inst.isctype(*position, m_word_mask);
         ++position;
      }
      if(b == prev)
      {
         pstate = pstate->next.p;
         return true;
      }
   }
   return false;
}

template <class BidiIterator, class Allocator, class traits>
bool perl_matcher<BidiIterator, Allocator, traits>::match_word_start()
{
   if(position == last)
      return false; // can't be starting a word if we're already at the end of input
   if(!traits_inst.isctype(*position, m_word_mask))
      return false; // next character isn't a word character
   if((position == backstop) && ((m_match_flags & match_prev_avail) == 0))
   {
      if(m_match_flags & match_not_bow)
         return false; // no previous input
   }
   else
   {
      // otherwise inside buffer:
      BidiIterator t(position);
      --t;
      if(traits_inst.isctype(*t, m_word_mask))
         return false; // previous character not non-word
   }
   // OK we have a match:
   pstate = pstate->next.p;
   return true;
}

template <class BidiIterator, class Allocator, class traits>
bool perl_matcher<BidiIterator, Allocator, traits>::match_word_end()
{
   if((position == backstop) && ((m_match_flags & match_prev_avail) == 0))
      return false;  // start of buffer can't be end of word
   BidiIterator t(position);
   --t;
   if(traits_inst.isctype(*t, m_word_mask) == false)
      return false;  // previous character wasn't a word character

   if(position == last)
   {
      if(m_match_flags & match_not_eow)
         return false; // end of buffer but not end of word
   }
   else
   {
      // otherwise inside buffer:
      if(traits_inst.isctype(*position, m_word_mask))
         return false; // next character is a word character
   }
   pstate = pstate->next.p;
   return true;      // if we fall through to here then we've succeeded
}

template <class BidiIterator, class Allocator, class traits>
bool perl_matcher<BidiIterator, Allocator, traits>::match_buffer_start()
{
   if((position != backstop) || (m_match_flags & match_not_bob))
      return false;
   // OK match:
   pstate = pstate->next.p;
   return true;
}

template <class BidiIterator, class Allocator, class traits>
bool perl_matcher<BidiIterator, Allocator, traits>::match_buffer_end()
{
   if((position != last) || (m_match_flags & match_not_eob))
      return false;
   // OK match:
   pstate = pstate->next.p;
   return true;
}

template <class BidiIterator, class Allocator, class traits>
bool perl_matcher<BidiIterator, Allocator, traits>::match_backref()
{
   //
   // Compare with what we previously matched.
   // Note that this succeeds if the backref did not partisipate
   // in the match, this is in line with ECMAScript, but not Perl
   // or PCRE.
   //
   int index = static_cast<const re_brace*>(pstate)->index;
   if(index >= 10000)
   {
      named_subexpressions::range_type r = re.get_data().equal_range(index);
      BOOST_ASSERT(r.first != r.second);
      do
      {
         index = r.first->index;
         ++r.first;
      }while((r.first != r.second) && ((*m_presult)[index].matched != true));
   }

   if((m_match_flags & match_perl) && !(*m_presult)[index].matched)
      return false;

   BidiIterator i = (*m_presult)[index].first;
   BidiIterator j = (*m_presult)[index].second;
   while(i != j)
   {
      if((position == last) || (traits_inst.translate(*position, icase) != traits_inst.translate(*i, icase)))
         return false;
      ++i;
      ++position;
   }
   pstate = pstate->next.p;
   return true;
}

template <class BidiIterator, class Allocator, class traits>
bool perl_matcher<BidiIterator, Allocator, traits>::match_long_set()
{
   typedef typename traits::char_class_type char_class_type;
   // let the traits class do the work:
   if(position == last)
      return false;
   BidiIterator t = re_is_set_member(position, last, static_cast<const re_set_long<char_class_type>*>(pstate), re.get_data(), icase);
   if(t != position)
   {
      pstate = pstate->next.p;
      position = t;
      return true;
   }
   return false;
}

template <class BidiIterator, class Allocator, class traits>
bool perl_matcher<BidiIterator, Allocator, traits>::match_set()
{
   if(position == last)
      return false;
   if(static_cast<const re_set*>(pstate)->_map[static_cast<unsigned char>(traits_inst.translate(*position, icase))])
   {
      pstate = pstate->next.p;
      ++position;
      return true;
   }
   return false;
}

template <class BidiIterator, class Allocator, class traits>
bool perl_matcher<BidiIterator, Allocator, traits>::match_jump()
{
   pstate = static_cast<const re_jump*>(pstate)->alt.p;
   return true;
}

template <class BidiIterator, class Allocator, class traits>
bool perl_matcher<BidiIterator, Allocator, traits>::match_combining()
{
   if(position == last)
      return false;
   if(is_combining(traits_inst.translate(*position, icase)))
      return false;
   ++position;
   while((position != last) && is_combining(traits_inst.translate(*position, icase)))
      ++position;
   pstate = pstate->next.p;
   return true;
}

template <class BidiIterator, class Allocator, class traits>
bool perl_matcher<BidiIterator, Allocator, traits>::match_soft_buffer_end()
{
   if(m_match_flags & match_not_eob)
      return false;
   BidiIterator p(position);
   while((p != last) && is_separator(traits_inst.translate(*p, icase)))++p;
   if(p != last)
      return false;
   pstate = pstate->next.p;
   return true;
}

template <class BidiIterator, class Allocator, class traits>
bool perl_matcher<BidiIterator, Allocator, traits>::match_restart_continue()
{
   if(position == search_base)
   {
      pstate = pstate->next.p;
      return true;
   }
   return false;
}

template <class BidiIterator, class Allocator, class traits>
bool perl_matcher<BidiIterator, Allocator, traits>::match_backstep()
{
#ifdef BOOST_MSVC
#pragma warning(push)
#pragma warning(disable:4127)
#endif
   if( ::cutl_details_boost::is_random_access_iterator<BidiIterator>::value)
   {
      std::ptrdiff_t maxlen = ::cutl_details_boost::re_detail::distance(backstop, position);
      if(maxlen < static_cast<const re_brace*>(pstate)->index)
         return false;
      std::advance(position, -static_cast<const re_brace*>(pstate)->index);
   }
   else
   {
      int c = static_cast<const re_brace*>(pstate)->index;
      while(c--)
      {
         if(position == backstop)
            return false;
         --position;
      }
   }
   pstate = pstate->next.p;
   return true;
#ifdef BOOST_MSVC
#pragma warning(pop)
#endif
}

template <class BidiIterator, class Allocator, class traits>
inline bool perl_matcher<BidiIterator, Allocator, traits>::match_assert_backref()
{
   // return true if marked sub-expression N has been matched:
   int index = static_cast<const re_brace*>(pstate)->index;
   bool result = false;
   if(index == 9999)
   {
      // Magic value for a (DEFINE) block:
      return false;
   }
   else if(index > 0)
   {
      // Have we matched subexpression "index"?
      // Check if index is a hash value:
      if(index >= 10000)
      {
         named_subexpressions::range_type r = re.get_data().equal_range(index);
         while(r.first != r.second)
         {
            if((*m_presult)[r.first->index].matched)
            {
               result = true;
               break;
            }
            ++r.first;
         }
      }
      else
      {
         result = (*m_presult)[index].matched;
      }
      pstate = pstate->next.p;
   }
   else
   {
      // Have we recursed into subexpression "index"?
      // If index == 0 then check for any recursion at all, otherwise for recursion to -index-1.
      int idx = -index-1;
      if(idx >= 10000)
      {
         named_subexpressions::range_type r = re.get_data().equal_range(idx);
         int stack_index = recursion_stack.empty() ? -1 : recursion_stack.back().idx;
         while(r.first != r.second)
         {
            result |= (stack_index == r.first->index);
            if(result)break;
            ++r.first;
         }
      }
      else
      {
         result = !recursion_stack.empty() && ((recursion_stack.back().idx == idx) || (index == 0));
      }
      pstate = pstate->next.p;
   }
   return result;
}

template <class BidiIterator, class Allocator, class traits>
bool perl_matcher<BidiIterator, Allocator, traits>::match_toggle_case()
{
   // change our case sensitivity:
   this->icase = static_cast<const re_case*>(pstate)->icase;
   pstate = pstate->next.p;
   return true;
}


template <class BidiIterator, class Allocator, class traits>
bool perl_matcher<BidiIterator, Allocator, traits>::find_restart_any()
{
#ifdef BOOST_MSVC
#pragma warning(push)
#pragma warning(disable:4127)
#endif
   const unsigned char* _map = re.get_map();
   while(true)
   {
      // skip everything we can't match:
      while((position != last) && !can_start(*position, _map, (unsigned char)mask_any) )
         ++position;
      if(position == last)
      {
         // run out of characters, try a null match if possible:
         if(re.can_be_null())
            return match_prefix();
         break;
      }
      // now try and obtain a match:
      if(match_prefix())
         return true;
      if(position == last)
         return false;
      ++position;
   }
   return false;
#ifdef BOOST_MSVC
#pragma warning(pop)
#endif
}

template <class BidiIterator, class Allocator, class traits>
bool perl_matcher<BidiIterator, Allocator, traits>::find_restart_word()
{
#ifdef BOOST_MSVC
#pragma warning(push)
#pragma warning(disable:4127)
#endif
   // do search optimised for word starts:
   const unsigned char* _map = re.get_map();
   if((m_match_flags & match_prev_avail) || (position != base))
      --position;
   else if(match_prefix())
      return true;
   do
   {
      while((position != last) && traits_inst.isctype(*position, m_word_mask))
         ++position;
      while((position != last) && !traits_inst.isctype(*position, m_word_mask))
         ++position;
      if(position == last)
         break;

      if(can_start(*position, _map, (unsigned char)mask_any) )
      {
         if(match_prefix())
            return true;
      }
      if(position == last)
         break;
   } while(true);
   return false;
#ifdef BOOST_MSVC
#pragma warning(pop)
#endif
}

template <class BidiIterator, class Allocator, class traits>
bool perl_matcher<BidiIterator, Allocator, traits>::find_restart_line()
{
   // do search optimised for line starts:
   const unsigned char* _map = re.get_map();
   if(match_prefix())
      return true;
   while(position != last)
   {
      while((position != last) && !is_separator(*position))
         ++position;
      if(position == last)
         return false;
      ++position;
      if(position == last)
      {
         if(re.can_be_null() && match_prefix())
            return true;
         return false;
      }

      if( can_start(*position, _map, (unsigned char)mask_any) )
      {
         if(match_prefix())
            return true;
      }
      if(position == last)
         return false;
      //++position;
   }
   return false;
}

template <class BidiIterator, class Allocator, class traits>
bool perl_matcher<BidiIterator, Allocator, traits>::find_restart_buf()
{
   if((position == base) && ((m_match_flags & match_not_bob) == 0))
      return match_prefix();
   return false;
}

template <class BidiIterator, class Allocator, class traits>
bool perl_matcher<BidiIterator, Allocator, traits>::find_restart_lit()
{
#if 0
   if(position == last)
      return false; // can't possibly match if we're at the end already

   unsigned type = (m_match_flags & match_continuous) ? 
      static_cast<unsigned int>(regbase::restart_continue) 
         : static_cast<unsigned int>(re.get_restart_type());

   const kmp_info<char_type>* info = access::get_kmp(re);
   int len = info->len;
   const char_type* x = info->pstr;
   int j = 0; 
   while (position != last) 
   {
      while((j > -1) && (x[j] != traits_inst.translate(*position, icase))) 
         j = info->kmp_next[j];
      ++position;
      ++j;
      if(j >= len) 
      {
         if(type == regbase::restart_fixed_lit)
         {
            std::advance(position, -j);
            restart = position;
            std::advance(restart, len);
            m_result.set_first(position);
            m_result.set_second(restart);
            position = restart;
            return true;
         }
         else
         {
            restart = position;
            std::advance(position, -j);
            if(match_prefix())
               return true;
            else
            {
               for(int k = 0; (restart != position) && (k < j); ++k, --restart)
                     {} // dwa 10/20/2000 - warning suppression for MWCW
               if(restart != last)
                  ++restart;
               position = restart;
               j = 0;  //we could do better than this...
            }
         }
      }
   }
   if((m_match_flags & match_partial) && (position == last) && j)
   {
      // we need to check for a partial match:
      restart = position;
      std::advance(position, -j);
      return match_prefix();
   }
#endif
   return false;
}

} // namespace re_detail

} // namespace cutl_details_boost

#ifdef BOOST_MSVC
#  pragma warning(pop)
#endif

#ifdef __BORLANDC__
#  pragma option pop
#endif
#ifdef BOOST_MSVC
#pragma warning(push)
#pragma warning(disable: 4103)
#endif
#ifdef BOOST_HAS_ABI_HEADERS
#  include BOOST_ABI_SUFFIX
#endif
#ifdef BOOST_MSVC
#pragma warning(pop)
#endif

#endif