summaryrefslogtreecommitdiffstats
path: root/Source/cmStringCommand.cxx
blob: edc6afc19dde18f98f7757bf7c72be1923491dbe (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
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
/*============================================================================
  CMake - Cross Platform Makefile Generator
  Copyright 2000-2009 Kitware, Inc., Insight Software Consortium

  Distributed under the OSI-approved BSD License (the "License");
  see accompanying file Copyright.txt for details.

  This software is distributed WITHOUT ANY WARRANTY; without even the
  implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  See the License for more information.
============================================================================*/
#include "cmStringCommand.h"
#include "cmCryptoHash.h"

#include <cmsys/RegularExpression.hxx>
#include <cmsys/SystemTools.hxx>

#include <stdlib.h> // required for atoi
#include <ctype.h>
#include <time.h>

#include <cmTimestamp.h>
#include <cmUuid.h>

//----------------------------------------------------------------------------
bool cmStringCommand
::InitialPass(std::vector<std::string> const& args, cmExecutionStatus &)
{
  if(args.size() < 1)
    {
    this->SetError("must be called with at least one argument.");
    return false;
    }

  const std::string &subCommand = args[0];
  if(subCommand == "REGEX")
    {
    return this->HandleRegexCommand(args);
    }
  else if(subCommand == "REPLACE")
    {
    return this->HandleReplaceCommand(args);
    }
  else if ( subCommand == "MD5" ||
            subCommand == "SHA1" ||
            subCommand == "SHA224" ||
            subCommand == "SHA256" ||
            subCommand == "SHA384" ||
            subCommand == "SHA512" )
    {
    return this->HandleHashCommand(args);
    }
  else if(subCommand == "TOLOWER")
    {
    return this->HandleToUpperLowerCommand(args, false);
    }
  else if(subCommand == "TOUPPER")
    {
    return this->HandleToUpperLowerCommand(args, true);
    }
  else if(subCommand == "COMPARE")
    {
    return this->HandleCompareCommand(args);
    }
  else if(subCommand == "ASCII")
    {
    return this->HandleAsciiCommand(args);
    }
  else if(subCommand == "CONFIGURE")
    {
    return this->HandleConfigureCommand(args);
    }
  else if(subCommand == "LENGTH")
    {
    return this->HandleLengthCommand(args);
    }
  else if(subCommand == "CONCAT")
    {
    return this->HandleConcatCommand(args);
    }
  else if(subCommand == "SUBSTRING")
    {
    return this->HandleSubstringCommand(args);
    }
  else if(subCommand == "STRIP")
    {
    return this->HandleStripCommand(args);
    }
  else if(subCommand == "RANDOM")
    {
    return this->HandleRandomCommand(args);
    }
  else if(subCommand == "FIND")
    {
    return this->HandleFindCommand(args);
    }
  else if(subCommand == "TIMESTAMP")
    {
    return this->HandleTimestampCommand(args);
    }
  else if(subCommand == "MAKE_C_IDENTIFIER")
    {
    return this->HandleMakeCIdentifierCommand(args);
    }
  else if(subCommand == "GENEX_STRIP")
    {
    return this->HandleGenexStripCommand(args);
    }
  else if(subCommand == "UUID")
    {
    return this->HandleUuidCommand(args);
    }

  std::string e = "does not recognize sub-command "+subCommand;
  this->SetError(e);
  return false;
}

//----------------------------------------------------------------------------
bool cmStringCommand::HandleHashCommand(std::vector<std::string> const& args)
{
#if defined(CMAKE_BUILD_WITH_CMAKE)
  if(args.size() != 3)
    {
    std::ostringstream e;
    e << args[0] << " requires an output variable and an input string";
    this->SetError(e.str());
    return false;
    }

  cmsys::auto_ptr<cmCryptoHash> hash(cmCryptoHash::New(args[0].c_str()));
  if(hash.get())
    {
    std::string out = hash->HashString(args[2]);
    this->Makefile->AddDefinition(args[1], out.c_str());
    return true;
    }
  return false;
#else
  std::ostringstream e;
  e << args[0] << " not available during bootstrap";
  this->SetError(e.str().c_str());
  return false;
#endif
}

//----------------------------------------------------------------------------
bool cmStringCommand::HandleToUpperLowerCommand(
  std::vector<std::string> const& args, bool toUpper)
{
  if ( args.size() < 3 )
    {
    this->SetError("no output variable specified");
    return false;
    }

  std::string outvar = args[2];
  std::string output;

  if (toUpper)
    {
    output = cmSystemTools::UpperCase(args[1]);
    }
  else
    {
    output = cmSystemTools::LowerCase(args[1]);
    }

  // Store the output in the provided variable.
  this->Makefile->AddDefinition(outvar, output.c_str());
  return true;
}

//----------------------------------------------------------------------------
bool cmStringCommand::HandleAsciiCommand(std::vector<std::string> const& args)
{
  if ( args.size() < 3 )
    {
    this->SetError("No output variable specified");
    return false;
    }
  std::string::size_type cc;
  std::string outvar = args[args.size()-1];
  std::string output = "";
  for ( cc = 1; cc < args.size()-1; cc ++ )
    {
    int ch = atoi(args[cc].c_str());
    if ( ch > 0 && ch < 256 )
      {
      output += static_cast<char>(ch);
      }
    else
      {
      std::string error = "Character with code ";
      error += args[cc];
      error += " does not exist.";
      this->SetError(error);
      return false;
      }
    }
  // Store the output in the provided variable.
  this->Makefile->AddDefinition(outvar, output.c_str());
  return true;
}

//----------------------------------------------------------------------------
bool cmStringCommand::HandleConfigureCommand(
  std::vector<std::string> const& args)
{
  if ( args.size() < 2 )
    {
    this->SetError("No input string specified.");
    return false;
    }
  else if ( args.size() < 3 )
    {
    this->SetError("No output variable specified.");
    return false;
    }

  // Parse options.
  bool escapeQuotes = false;
  bool atOnly = false;
  for(unsigned int i = 3; i < args.size(); ++i)
    {
    if(args[i] == "@ONLY")
      {
      atOnly = true;
      }
    else if(args[i] == "ESCAPE_QUOTES")
      {
      escapeQuotes = true;
      }
    else
      {
      std::ostringstream err;
      err << "Unrecognized argument \"" << args[i] << "\"";
      this->SetError(err.str());
      return false;
      }
    }

  // Configure the string.
  std::string output;
  this->Makefile->ConfigureString(args[1], output, atOnly, escapeQuotes);

  // Store the output in the provided variable.
  this->Makefile->AddDefinition(args[2], output.c_str());

  return true;
}

//----------------------------------------------------------------------------
bool cmStringCommand::HandleRegexCommand(std::vector<std::string> const& args)
{
  if(args.size() < 2)
    {
    this->SetError("sub-command REGEX requires a mode to be specified.");
    return false;
    }
  std::string mode = args[1];
  if(mode == "MATCH")
    {
    if(args.size() < 5)
      {
      this->SetError("sub-command REGEX, mode MATCH needs "
                     "at least 5 arguments total to command.");
      return false;
      }
    return this->RegexMatch(args);
    }
  else if(mode == "MATCHALL")
    {
    if(args.size() < 5)
      {
      this->SetError("sub-command REGEX, mode MATCHALL needs "
                     "at least 5 arguments total to command.");
      return false;
      }
    return this->RegexMatchAll(args);
    }
  else if(mode == "REPLACE")
    {
    if(args.size() < 6)
      {
      this->SetError("sub-command REGEX, mode REPLACE needs "
                     "at least 6 arguments total to command.");
      return false;
      }
    return this->RegexReplace(args);
    }

  std::string e = "sub-command REGEX does not recognize mode "+mode;
  this->SetError(e);
  return false;
}

//----------------------------------------------------------------------------
bool cmStringCommand::RegexMatch(std::vector<std::string> const& args)
{
  //"STRING(REGEX MATCH <regular_expression> <output variable>
  // <input> [<input>...])\n";
  std::string regex = args[2];
  std::string outvar = args[3];

  this->Makefile->ClearMatches();
  // Compile the regular expression.
  cmsys::RegularExpression re;
  if(!re.compile(regex.c_str()))
    {
    std::string e =
      "sub-command REGEX, mode MATCH failed to compile regex \""+regex+"\".";
    this->SetError(e);
    return false;
    }

  // Concatenate all the last arguments together.
  std::string input = cmJoin(cmRange(args).advance(4), std::string());

  // Scan through the input for all matches.
  std::string output;
  if(re.find(input.c_str()))
    {
    this->Makefile->StoreMatches(re);
    std::string::size_type l = re.start();
    std::string::size_type r = re.end();
    if(r-l == 0)
      {
      std::string e =
        "sub-command REGEX, mode MATCH regex \""+regex+
        "\" matched an empty string.";
      this->SetError(e);
      return false;
      }
    output = input.substr(l, r-l);
    }

  // Store the output in the provided variable.
  this->Makefile->AddDefinition(outvar, output.c_str());
  return true;
}

//----------------------------------------------------------------------------
bool cmStringCommand::RegexMatchAll(std::vector<std::string> const& args)
{
  //"STRING(REGEX MATCHALL <regular_expression> <output variable> <input>
  // [<input>...])\n";
  std::string regex = args[2];
  std::string outvar = args[3];

  this->Makefile->ClearMatches();
  // Compile the regular expression.
  cmsys::RegularExpression re;
  if(!re.compile(regex.c_str()))
    {
    std::string e =
      "sub-command REGEX, mode MATCHALL failed to compile regex \""+
      regex+"\".";
    this->SetError(e);
    return false;
    }

  // Concatenate all the last arguments together.
  std::string input = cmJoin(cmRange(args).advance(4), std::string());

  // Scan through the input for all matches.
  std::string output;
  const char* p = input.c_str();
  while(re.find(p))
    {
    this->Makefile->StoreMatches(re);
    std::string::size_type l = re.start();
    std::string::size_type r = re.end();
    if(r-l == 0)
      {
      std::string e = "sub-command REGEX, mode MATCHALL regex \""+
        regex+"\" matched an empty string.";
      this->SetError(e);
      return false;
      }
    if(!output.empty())
      {
      output += ";";
      }
    output += std::string(p+l, r-l);
    p += r;
    }

  // Store the output in the provided variable.
  this->Makefile->AddDefinition(outvar, output.c_str());
  return true;
}

//----------------------------------------------------------------------------
bool cmStringCommand::RegexReplace(std::vector<std::string> const& args)
{
  //"STRING(REGEX REPLACE <regular_expression> <replace_expression>
  // <output variable> <input> [<input>...])\n"
  std::string regex = args[2];
  std::string replace = args[3];
  std::string outvar = args[4];

  // Pull apart the replace expression to find the escaped [0-9] values.
  std::vector<RegexReplacement> replacement;
  std::string::size_type l = 0;
  while(l < replace.length())
    {
    std::string::size_type r = replace.find("\\", l);
    if(r == std::string::npos)
      {
      r = replace.length();
      replacement.push_back(replace.substr(l, r-l));
      }
    else
      {
      if(r-l > 0)
        {
        replacement.push_back(replace.substr(l, r-l));
        }
      if(r == (replace.length()-1))
        {
        this->SetError("sub-command REGEX, mode REPLACE: "
                       "replace-expression ends in a backslash.");
        return false;
        }
      if((replace[r+1] >= '0') && (replace[r+1] <= '9'))
        {
        replacement.push_back(replace[r+1]-'0');
        }
      else if(replace[r+1] == 'n')
        {
        replacement.push_back("\n");
        }
      else if(replace[r+1] == '\\')
        {
        replacement.push_back("\\");
        }
      else
        {
        std::string e = "sub-command REGEX, mode REPLACE: Unknown escape \"";
        e += replace.substr(r, 2);
        e += "\" in replace-expression.";
        this->SetError(e);
        return false;
        }
      r += 2;
      }
    l = r;
    }

  this->Makefile->ClearMatches();
  // Compile the regular expression.
  cmsys::RegularExpression re;
  if(!re.compile(regex.c_str()))
    {
    std::string e =
      "sub-command REGEX, mode REPLACE failed to compile regex \""+
      regex+"\".";
    this->SetError(e);
    return false;
    }

  // Concatenate all the last arguments together.
  std::string input = cmJoin(cmRange(args).advance(5), std::string());

  // Scan through the input for all matches.
  std::string output;
  std::string::size_type base = 0;
  while(re.find(input.c_str()+base))
    {
    this->Makefile->StoreMatches(re);
    std::string::size_type l2 = re.start();
    std::string::size_type r = re.end();

    // Concatenate the part of the input that was not matched.
    output += input.substr(base, l2);

    // Make sure the match had some text.
    if(r-l2 == 0)
      {
      std::string e = "sub-command REGEX, mode REPLACE regex \""+
        regex+"\" matched an empty string.";
      this->SetError(e);
      return false;
      }

    // Concatenate the replacement for the match.
    for(unsigned int i=0; i < replacement.size(); ++i)
      {
      if(replacement[i].number < 0)
        {
        // This is just a plain-text part of the replacement.
        output += replacement[i].value;
        }
      else
        {
        // Replace with part of the match.
        int n = replacement[i].number;
        std::string::size_type start = re.start(n);
        std::string::size_type end = re.end(n);
        std::string::size_type len = input.length()-base;
        if((start != std::string::npos) && (end != std::string::npos) &&
           (start <= len) && (end <= len))
          {
          output += input.substr(base+start, end-start);
          }
        else
          {
          std::string e =
            "sub-command REGEX, mode REPLACE: replace expression \""+
            replace+"\" contains an out-of-range escape for regex \""+
            regex+"\".";
          this->SetError(e);
          return false;
          }
        }
      }

    // Move past the match.
    base += r;
    }

  // Concatenate the text after the last match.
  output += input.substr(base, input.length()-base);

  // Store the output in the provided variable.
  this->Makefile->AddDefinition(outvar, output.c_str());
  return true;
}

//----------------------------------------------------------------------------
bool cmStringCommand::HandleFindCommand(std::vector<std::string> const&
                                           args)
{
  // check if all required parameters were passed
  if(args.size() < 4 || args.size() > 5)
    {
    this->SetError("sub-command FIND requires 3 or 4 parameters.");
    return false;
    }

  // check if the reverse flag was set or not
  bool reverseMode = false;
  if(args.size() == 5 && args[4] == "REVERSE")
    {
    reverseMode = true;
    }

  // if we have 5 arguments the last one must be REVERSE
  if(args.size() == 5 && args[4] != "REVERSE")
    {
    this->SetError("sub-command FIND: unknown last parameter");
    return false;
    }

  // local parameter names.
  const std::string& sstring = args[1];
  const std::string& schar = args[2];
  const std::string& outvar = args[3];

  // ensure that the user cannot accidentally specify REVERSE as a variable
  if(outvar == "REVERSE")
    {
    this->SetError("sub-command FIND does not allow to select REVERSE as "
                   "the output variable.  "
                   "Maybe you missed the actual output variable?");
    return false;
    }

  // try to find the character and return its position
  size_t pos;
  if(!reverseMode)
    {
    pos = sstring.find(schar);
    }
  else
    {
    pos = sstring.rfind(schar);
    }
  if(std::string::npos != pos)
    {
    std::ostringstream s;
    s << pos;
    this->Makefile->AddDefinition(outvar, s.str().c_str());
    return true;
    }

  // the character was not found, but this is not really an error
  this->Makefile->AddDefinition(outvar, "-1");
  return true;
}

//----------------------------------------------------------------------------
bool cmStringCommand::HandleCompareCommand(std::vector<std::string> const&
                                           args)
{
  if(args.size() < 2)
    {
    this->SetError("sub-command COMPARE requires a mode to be specified.");
    return false;
    }
  std::string mode = args[1];
  if((mode == "EQUAL") || (mode == "NOTEQUAL") ||
     (mode == "LESS") || (mode == "GREATER"))
    {
    if(args.size() < 5)
      {
      std::string e = "sub-command COMPARE, mode ";
      e += mode;
      e += " needs at least 5 arguments total to command.";
      this->SetError(e);
      return false;
      }

    const std::string& left = args[2];
    const std::string& right = args[3];
    const std::string& outvar = args[4];
    bool result;
    if(mode == "LESS")
      {
      result = (left < right);
      }
    else if(mode == "GREATER")
      {
      result = (left > right);
      }
    else if(mode == "EQUAL")
      {
      result = (left == right);
      }
    else // if(mode == "NOTEQUAL")
      {
      result = !(left == right);
      }
    if(result)
      {
      this->Makefile->AddDefinition(outvar, "1");
      }
    else
      {
      this->Makefile->AddDefinition(outvar, "0");
      }
    return true;
    }
  std::string e = "sub-command COMPARE does not recognize mode "+mode;
  this->SetError(e);
  return false;
}

//----------------------------------------------------------------------------
bool cmStringCommand::HandleReplaceCommand(std::vector<std::string> const&
                                           args)
{
  if(args.size() < 5)
    {
    this->SetError("sub-command REPLACE requires at least four arguments.");
    return false;
    }

  const std::string& matchExpression = args[1];
  const std::string& replaceExpression = args[2];
  const std::string& variableName = args[3];

  std::string input = cmJoin(cmRange(args).advance(4), std::string());

  cmsys::SystemTools::ReplaceString(input, matchExpression.c_str(),
                                    replaceExpression.c_str());

  this->Makefile->AddDefinition(variableName, input.c_str());
  return true;
}

//----------------------------------------------------------------------------
bool cmStringCommand::HandleSubstringCommand(std::vector<std::string> const&
                                             args)
{
  if(args.size() != 5)
    {
    this->SetError("sub-command SUBSTRING requires four arguments.");
    return false;
    }

  const std::string& stringValue = args[1];
  int begin = atoi(args[2].c_str());
  int end = atoi(args[3].c_str());
  const std::string& variableName = args[4];

  size_t stringLength = stringValue.size();
  int intStringLength = static_cast<int>(stringLength);
  if ( begin < 0 || begin > intStringLength )
    {
    std::ostringstream ostr;
    ostr << "begin index: " << begin << " is out of range 0 - "
         << stringLength;
    this->SetError(ostr.str());
    return false;
    }
  if ( end < -1 )
    {
    std::ostringstream ostr;
    ostr << "end index: " << end << " should be -1 or greater";
    this->SetError(ostr.str());
    return false;
    }

  this->Makefile->AddDefinition(variableName,
                                stringValue.substr(begin, end).c_str());
  return true;
}

//----------------------------------------------------------------------------
bool cmStringCommand
::HandleLengthCommand(std::vector<std::string> const& args)
{
  if(args.size() != 3)
    {
    this->SetError("sub-command LENGTH requires two arguments.");
    return false;
    }

  const std::string& stringValue = args[1];
  const std::string& variableName = args[2];

  size_t length = stringValue.size();
  char buffer[1024];
  sprintf(buffer, "%d", static_cast<int>(length));

  this->Makefile->AddDefinition(variableName, buffer);
  return true;
}

//----------------------------------------------------------------------------
bool cmStringCommand
::HandleConcatCommand(std::vector<std::string> const& args)
{
  if(args.size() < 2)
    {
    this->SetError("sub-command CONCAT requires at least one argument.");
    return false;
    }

  std::string const& variableName = args[1];
  std::string value = cmJoin(cmRange(args).advance(2), std::string());

  this->Makefile->AddDefinition(variableName, value.c_str());
  return true;
}

//----------------------------------------------------------------------------
bool cmStringCommand
::HandleMakeCIdentifierCommand(std::vector<std::string> const& args)
{
  if(args.size() != 3)
    {
    this->SetError("sub-command MAKE_C_IDENTIFIER requires two arguments.");
    return false;
    }

  const std::string& input = args[1];
  const std::string& variableName = args[2];

  this->Makefile->AddDefinition(variableName,
                      cmSystemTools::MakeCidentifier(input).c_str());
  return true;
}

//----------------------------------------------------------------------------
bool cmStringCommand
::HandleGenexStripCommand(std::vector<std::string> const& args)
{
  if(args.size() != 3)
    {
    this->SetError("sub-command GENEX_STRIP requires two arguments.");
    return false;
    }

  const std::string& input = args[1];

  std::string result = cmGeneratorExpression::Preprocess(input,
                        cmGeneratorExpression::StripAllGeneratorExpressions);

  const std::string& variableName = args[2];

  this->Makefile->AddDefinition(variableName, result.c_str());
  return true;
}

//----------------------------------------------------------------------------
bool cmStringCommand::HandleStripCommand(
  std::vector<std::string> const& args)
{
 if(args.size() != 3)
    {
    this->SetError("sub-command STRIP requires two arguments.");
    return false;
    }

  const std::string& stringValue = args[1];
  const std::string& variableName = args[2];
  size_t inStringLength = stringValue.size();
  size_t startPos = inStringLength + 1;
  size_t endPos = 0;
  const char* ptr = stringValue.c_str();
  size_t cc;
  for ( cc = 0; cc < inStringLength; ++ cc )
    {
    if ( !isspace(*ptr) )
      {
      if ( startPos > inStringLength )
        {
        startPos = cc;
        }
      endPos = cc;
      }
    ++ ptr;
    }

  size_t outLength = 0;

  // if the input string didn't contain any non-space characters, return
  // an empty string
  if (startPos > inStringLength)
    {
    outLength = 0;
    startPos = 0;
    }
  else
    {
    outLength=endPos - startPos + 1;
    }

  this->Makefile->AddDefinition(variableName,
    stringValue.substr(startPos, outLength).c_str());
  return true;
}

//----------------------------------------------------------------------------
bool cmStringCommand
::HandleRandomCommand(std::vector<std::string> const& args)
{
  if(args.size() < 2 || args.size() == 3 || args.size() == 5)
    {
    this->SetError("sub-command RANDOM requires at least one argument.");
    return false;
    }

  static bool seeded = false;
  bool force_seed = false;
  unsigned int seed = 0;
  int length = 5;
  const char cmStringCommandDefaultAlphabet[] = "qwertyuiopasdfghjklzxcvbnm"
    "QWERTYUIOPASDFGHJKLZXCVBNM"
    "0123456789";
  std::string alphabet;

  if ( args.size() > 3 )
    {
    size_t i = 1;
    size_t stopAt = args.size() - 2;

    for ( ; i < stopAt; ++i )
      {
      if ( args[i] == "LENGTH" )
        {
        ++i;
        length = atoi(args[i].c_str());
        }
      else if ( args[i] == "ALPHABET" )
        {
        ++i;
        alphabet = args[i];
        }
      else if ( args[i] == "RANDOM_SEED" )
        {
        ++i;
        seed = static_cast<unsigned int>(atoi(args[i].c_str()));
        force_seed = true;
        }
      }
    }
  if (alphabet.empty())
    {
    alphabet = cmStringCommandDefaultAlphabet;
    }

  double sizeofAlphabet = static_cast<double>(alphabet.size());
  if ( sizeofAlphabet < 1 )
    {
    this->SetError("sub-command RANDOM invoked with bad alphabet.");
    return false;
    }
  if ( length < 1 )
    {
    this->SetError("sub-command RANDOM invoked with bad length.");
    return false;
    }
  const std::string& variableName = args[args.size()-1];

  std::vector<char> result;

  if (!seeded || force_seed)
    {
    seeded = true;
    srand(force_seed? seed : cmSystemTools::RandomSeed());
    }

  const char* alphaPtr = alphabet.c_str();
  int cc;
  for ( cc = 0; cc < length; cc ++ )
    {
    int idx=(int) (sizeofAlphabet* rand()/(RAND_MAX+1.0));
    result.push_back(*(alphaPtr + idx));
    }
  result.push_back(0);

  this->Makefile->AddDefinition(variableName, &*result.begin());
  return true;
}

//----------------------------------------------------------------------------
bool cmStringCommand
::HandleTimestampCommand(std::vector<std::string> const& args)
{
  if(args.size() < 2)
    {
    this->SetError("sub-command TIMESTAMP requires at least one argument.");
    return false;
    }
  else if(args.size() > 4)
    {
    this->SetError("sub-command TIMESTAMP takes at most three arguments.");
    return false;
    }

  unsigned int argsIndex = 1;

  const std::string &outputVariable = args[argsIndex++];

  std::string formatString;
  if(args.size() > argsIndex && args[argsIndex] != "UTC")
    {
    formatString = args[argsIndex++];
    }

  bool utcFlag = false;
  if(args.size() > argsIndex)
    {
    if(args[argsIndex] == "UTC")
      {
      utcFlag = true;
      }
    else
      {
      std::string e = " TIMESTAMP sub-command does not recognize option " +
          args[argsIndex] + ".";
      this->SetError(e);
      return false;
      }
    }

  cmTimestamp timestamp;
  std::string result = timestamp.CurrentTime(formatString, utcFlag);
  this->Makefile->AddDefinition(outputVariable, result.c_str());

  return true;
}

bool cmStringCommand
::HandleUuidCommand(std::vector<std::string> const& args)
{
#if defined(CMAKE_BUILD_WITH_CMAKE)
  unsigned int argsIndex = 1;

  if(args.size() < 2)
    {
    this->SetError("UUID sub-command requires an output variable.");
    return false;
    }

  const std::string &outputVariable = args[argsIndex++];

  std::string uuidNamespaceString;
  std::string uuidName;
  std::string uuidType;
  bool uuidUpperCase = false;

  while(args.size() > argsIndex)
    {
    if(args[argsIndex] == "NAMESPACE")
      {
      ++argsIndex;
      if(argsIndex >= args.size())
        {
        this->SetError("UUID sub-command, NAMESPACE requires a value.");
        return false;
        }
      uuidNamespaceString = args[argsIndex++];
      }
    else if(args[argsIndex] == "NAME")
      {
      ++argsIndex;
      if(argsIndex >= args.size())
        {
        this->SetError("UUID sub-command, NAME requires a value.");
        return false;
        }
      uuidName = args[argsIndex++];
      }
    else if(args[argsIndex] == "TYPE")
      {
      ++argsIndex;
      if(argsIndex >= args.size())
        {
        this->SetError("UUID sub-command, TYPE requires a value.");
        return false;
        }
      uuidType = args[argsIndex++];
      }
    else if(args[argsIndex] == "UPPER")
      {
      ++argsIndex;
      uuidUpperCase = true;
      }
    else
      {
      std::string e = "UUID sub-command does not recognize option " +
          args[argsIndex] + ".";
      this->SetError(e);
      return false;
      }
    }

  std::string uuid;
  cmUuid uuidGenerator;

  std::vector<unsigned char> uuidNamespace;
  if(!uuidGenerator.StringToBinary(uuidNamespaceString, uuidNamespace))
    {
    this->SetError("UUID sub-command, malformed NAMESPACE UUID.");
    return false;
    }

  if(uuidType == "MD5")
    {
    uuid = uuidGenerator.FromMd5(uuidNamespace, uuidName);
    }
  else if(uuidType == "SHA1")
    {
    uuid = uuidGenerator.FromSha1(uuidNamespace, uuidName);
    }
  else
    {
    std::string e = "UUID sub-command, unknown TYPE '" + uuidType + "'.";
    this->SetError(e);
    return false;
    }

  if(uuid.empty())
    {
    this->SetError("UUID sub-command, generation failed.");
    return false;
    }

  if(uuidUpperCase)
    {
    uuid = cmSystemTools::UpperCase(uuid);
    }

  this->Makefile->AddDefinition(outputVariable, uuid.c_str());
  return true;
#else
  std::ostringstream e;
  e << args[0] << " not available during bootstrap";
  this->SetError(e.str().c_str());
  return false;
#endif
}