summaryrefslogtreecommitdiffstats
path: root/Source/cmConditionEvaluator.cxx
blob: 61847d42b9525c2dce1f5d515dbbdb6949079542 (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
/*============================================================================
  CMake - Cross Platform Makefile Generator
  Copyright 2014 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 "cmConditionEvaluator.h"

cmConditionEvaluator::cmConditionEvaluator(cmMakefile& makefile):
  Makefile(makefile),
  Policy12Status(makefile.GetPolicyStatus(cmPolicies::CMP0012)),
  Policy54Status(makefile.GetPolicyStatus(cmPolicies::CMP0054)),
  Policy57Status(makefile.GetPolicyStatus(cmPolicies::CMP0057))
{

}

//=========================================================================
// order of operations,
// 1.   ( )   -- parenthetical groups
// 2.  IS_DIRECTORY EXISTS COMMAND DEFINED etc predicates
// 3. MATCHES LESS GREATER EQUAL STRLESS STRGREATER STREQUAL etc binary ops
// 4. NOT
// 5. AND OR
//
// There is an issue on whether the arguments should be values of references,
// for example IF (FOO AND BAR) should that compare the strings FOO and BAR
// or should it really do IF (${FOO} AND ${BAR}) Currently IS_DIRECTORY
// EXISTS COMMAND and DEFINED all take values. EQUAL, LESS and GREATER can
// take numeric values or variable names. STRLESS and STRGREATER take
// variable names but if the variable name is not found it will use the name
// directly. AND OR take variables or the values 0 or 1.

bool cmConditionEvaluator::IsTrue(
  const std::vector<cmExpandedCommandArgument> &args,
  std::string &errorString,
  cmake::MessageType &status)
{
  errorString = "";

  // handle empty invocation
  if (args.size() < 1)
    {
    return false;
    }

  // store the reduced args in this vector
  cmArgumentList newArgs;

  // copy to the list structure
  newArgs.insert(newArgs.end(), args.begin(), args.end());

  // now loop through the arguments and see if we can reduce any of them
  // we do this multiple times. Once for each level of precedence
  // parens
  if (!this->HandleLevel0(newArgs, errorString, status))
    {
    return false;
    }
  //predicates
  if (!this->HandleLevel1(newArgs, errorString, status))
    {
    return false;
    }
  // binary ops
  if (!this->HandleLevel2(newArgs, errorString, status))
    {
    return false;
    }

  // NOT
  if (!this->HandleLevel3(newArgs, errorString, status))
    {
    return false;
    }
  // AND OR
  if (!this->HandleLevel4(newArgs, errorString, status))
    {
    return false;
    }

  // now at the end there should only be one argument left
  if (newArgs.size() != 1)
    {
    errorString = "Unknown arguments specified";
    status = cmake::FATAL_ERROR;
    return false;
    }

  return this->GetBooleanValueWithAutoDereference(*(newArgs.begin()),
    errorString, status, true);
}

//=========================================================================
const char* cmConditionEvaluator::GetDefinitionIfUnquoted(
  cmExpandedCommandArgument const& argument) const
{
  if((this->Policy54Status != cmPolicies::WARN &&
     this->Policy54Status != cmPolicies::OLD) &&
     argument.WasQuoted())
    {
    return 0;
    }

  const char* def = this->Makefile.GetDefinition(argument.GetValue());

  if(def && argument.WasQuoted() && this->Policy54Status == cmPolicies::WARN)
    {
    if(!this->Makefile.HasCMP0054AlreadyBeenReported())
      {
      std::ostringstream e;
      e << (cmPolicies::GetPolicyWarning(cmPolicies::CMP0054)) << "\n";
      e << "Quoted variables like \"" << argument.GetValue() <<
        "\" will no longer be dereferenced "
        "when the policy is set to NEW.  "
        "Since the policy is not set the OLD behavior will be used.";

      this->Makefile.IssueMessage(cmake::AUTHOR_WARNING, e.str());
      }
    }

  return def;
}

//=========================================================================
const char* cmConditionEvaluator::GetVariableOrString(
    const cmExpandedCommandArgument& argument) const
{
  const char* def = this->GetDefinitionIfUnquoted(argument);

  if(!def)
    {
    def = argument.c_str();
    }

  return def;
}

//=========================================================================
bool cmConditionEvaluator::IsKeyword(std::string const& keyword,
  cmExpandedCommandArgument& argument) const
{
  if((this->Policy54Status != cmPolicies::WARN &&
     this->Policy54Status != cmPolicies::OLD) &&
     argument.WasQuoted())
    {
    return false;
    }

  bool isKeyword = argument.GetValue() == keyword;

  if(isKeyword && argument.WasQuoted() &&
    this->Policy54Status == cmPolicies::WARN)
    {
    if(!this->Makefile.HasCMP0054AlreadyBeenReported())
      {
      std::ostringstream e;
      e << cmPolicies::GetPolicyWarning(cmPolicies::CMP0054) << "\n";
      e << "Quoted keywords like \"" << argument.GetValue() <<
        "\" will no longer be interpreted as keywords "
        "when the policy is set to NEW.  "
        "Since the policy is not set the OLD behavior will be used.";

      this->Makefile.IssueMessage(cmake::AUTHOR_WARNING, e.str());
      }
    }

  return isKeyword;
}

//=========================================================================
bool cmConditionEvaluator::GetBooleanValue(
  cmExpandedCommandArgument& arg) const
{
  // Check basic constants.
  if (arg == "0")
    {
    return false;
    }
  if (arg == "1")
    {
    return true;
    }

  // Check named constants.
  if (cmSystemTools::IsOn(arg.c_str()))
    {
    return true;
    }
  if (cmSystemTools::IsOff(arg.c_str()))
    {
    return false;
    }

  // Check for numbers.
  if(!arg.empty())
    {
    char* end;
    double d = strtod(arg.c_str(), &end);
    if(*end == '\0')
      {
      // The whole string is a number.  Use C conversion to bool.
      return d? true:false;
      }
    }

  // Check definition.
  const char* def = this->GetDefinitionIfUnquoted(arg);
  return !cmSystemTools::IsOff(def);
}

//=========================================================================
// Boolean value behavior from CMake 2.6.4 and below.
bool cmConditionEvaluator::GetBooleanValueOld(
  cmExpandedCommandArgument const& arg, bool one) const
{
  if(one)
    {
    // Old IsTrue behavior for single argument.
    if(arg == "0")
      { return false; }
    else if(arg == "1")
      { return true; }
    else
      {
      const char* def = this->GetDefinitionIfUnquoted(arg);
      return !cmSystemTools::IsOff(def);
      }
    }
  else
    {
    // Old GetVariableOrNumber behavior.
    const char* def = this->GetDefinitionIfUnquoted(arg);
    if(!def && atoi(arg.c_str()))
      {
      def = arg.c_str();
      }
    return !cmSystemTools::IsOff(def);
    }
}

//=========================================================================
// returns the resulting boolean value
bool cmConditionEvaluator::GetBooleanValueWithAutoDereference(
  cmExpandedCommandArgument &newArg,
  std::string &errorString,
  cmake::MessageType &status,
  bool oneArg) const
{
  // Use the policy if it is set.
  if (this->Policy12Status == cmPolicies::NEW)
    {
    return GetBooleanValue(newArg);
    }
  else if (this->Policy12Status == cmPolicies::OLD)
    {
    return GetBooleanValueOld(newArg, oneArg);
    }

  // Check policy only if old and new results differ.
  bool newResult = this->GetBooleanValue(newArg);
  bool oldResult = this->GetBooleanValueOld(newArg, oneArg);
  if(newResult != oldResult)
    {
    switch(this->Policy12Status)
      {
      case cmPolicies::WARN:
        {
        errorString = "An argument named \"" + newArg.GetValue()
          + "\" appears in a conditional statement.  "
          + cmPolicies::GetPolicyWarning(cmPolicies::CMP0012);
        status = cmake::AUTHOR_WARNING;
        }
      case cmPolicies::OLD:
        return oldResult;
      case cmPolicies::REQUIRED_IF_USED:
      case cmPolicies::REQUIRED_ALWAYS:
        {
        errorString = "An argument named \"" + newArg.GetValue()
          + "\" appears in a conditional statement.  "
          + cmPolicies::GetRequiredPolicyError(cmPolicies::CMP0012);
        status = cmake::FATAL_ERROR;
        }
      case cmPolicies::NEW:
        break;
      }
    }
  return newResult;
}

//=========================================================================
void cmConditionEvaluator::IncrementArguments(cmArgumentList &newArgs,
                        cmArgumentList::iterator &argP1,
                        cmArgumentList::iterator &argP2) const
{
  if (argP1  != newArgs.end())
    {
    argP1++;
    argP2 = argP1;
    if (argP1  != newArgs.end())
      {
      argP2++;
      }
    }
}

//=========================================================================
// helper function to reduce code duplication
void cmConditionEvaluator::HandlePredicate(bool value, int &reducible,
                     cmArgumentList::iterator &arg,
                     cmArgumentList &newArgs,
                     cmArgumentList::iterator &argP1,
                     cmArgumentList::iterator &argP2) const
{
  if(value)
    {
    *arg = cmExpandedCommandArgument("1", true);
    }
  else
    {
    *arg = cmExpandedCommandArgument("0", true);
    }
  newArgs.erase(argP1);
  argP1 = arg;
  this->IncrementArguments(newArgs,argP1,argP2);
  reducible = 1;
}

//=========================================================================
// helper function to reduce code duplication
void cmConditionEvaluator::HandleBinaryOp(bool value, int &reducible,
                     cmArgumentList::iterator &arg,
                     cmArgumentList &newArgs,
                     cmArgumentList::iterator &argP1,
                     cmArgumentList::iterator &argP2)
{
  if(value)
    {
    *arg = cmExpandedCommandArgument("1", true);
    }
  else
    {
    *arg = cmExpandedCommandArgument("0", true);
    }
  newArgs.erase(argP2);
  newArgs.erase(argP1);
  argP1 = arg;
  this->IncrementArguments(newArgs,argP1,argP2);
  reducible = 1;
}

//=========================================================================
// level 0 processes parenthetical expressions
bool cmConditionEvaluator::HandleLevel0(cmArgumentList &newArgs,
                  std::string &errorString,
                  cmake::MessageType &status)
{
  int reducible;
  do
    {
    reducible = 0;
    cmArgumentList::iterator arg = newArgs.begin();
    while (arg != newArgs.end())
      {
      if (IsKeyword("(", *arg))
        {
        // search for the closing paren for this opening one
        cmArgumentList::iterator argClose;
        argClose = arg;
        argClose++;
        unsigned int depth = 1;
        while (argClose != newArgs.end() && depth)
          {
          if (this->IsKeyword("(", *argClose))
            {
              depth++;
            }
          if (this->IsKeyword(")", *argClose))
            {
              depth--;
            }
          argClose++;
          }
        if (depth)
          {
          errorString = "mismatched parenthesis in condition";
          status = cmake::FATAL_ERROR;
          return false;
          }
        // store the reduced args in this vector
        std::vector<cmExpandedCommandArgument> newArgs2;

        // copy to the list structure
        cmArgumentList::iterator argP1 = arg;
        argP1++;
        newArgs2.insert(newArgs2.end(), argP1, argClose);
        newArgs2.pop_back();
        // now recursively invoke IsTrue to handle the values inside the
        // parenthetical expression
        bool value =
          this->IsTrue(newArgs2, errorString, status);
        if(value)
          {
          *arg = cmExpandedCommandArgument("1", true);
          }
        else
          {
          *arg = cmExpandedCommandArgument("0", true);
          }
        argP1 = arg;
        argP1++;
        // remove the now evaluated parenthetical expression
        newArgs.erase(argP1,argClose);
        }
      ++arg;
      }
    }
  while (reducible);
  return true;
}

//=========================================================================
// level one handles most predicates except for NOT
bool cmConditionEvaluator::HandleLevel1(cmArgumentList &newArgs,
                  std::string &, cmake::MessageType &)
{
  int reducible;
  do
    {
    reducible = 0;
    cmArgumentList::iterator arg = newArgs.begin();
    cmArgumentList::iterator argP1;
    cmArgumentList::iterator argP2;
    while (arg != newArgs.end())
      {
      argP1 = arg;
      this->IncrementArguments(newArgs,argP1,argP2);
      // does a file exist
      if (this->IsKeyword("EXISTS", *arg) && argP1  != newArgs.end())
        {
        this->HandlePredicate(
          cmSystemTools::FileExists(argP1->c_str()),
          reducible, arg, newArgs, argP1, argP2);
        }
      // does a directory with this name exist
      if (this->IsKeyword("IS_DIRECTORY", *arg) && argP1  != newArgs.end())
        {
        this->HandlePredicate(
          cmSystemTools::FileIsDirectory(argP1->c_str()),
          reducible, arg, newArgs, argP1, argP2);
        }
      // does a symlink with this name exist
      if (this->IsKeyword("IS_SYMLINK", *arg) && argP1  != newArgs.end())
        {
        this->HandlePredicate(
          cmSystemTools::FileIsSymlink(argP1->c_str()),
          reducible, arg, newArgs, argP1, argP2);
        }
      // is the given path an absolute path ?
      if (this->IsKeyword("IS_ABSOLUTE", *arg) && argP1  != newArgs.end())
        {
        this->HandlePredicate(
          cmSystemTools::FileIsFullPath(argP1->c_str()),
          reducible, arg, newArgs, argP1, argP2);
        }
      // does a command exist
      if (this->IsKeyword("COMMAND", *arg) && argP1  != newArgs.end())
        {
        cmCommand* command =
            this->Makefile.GetState()->GetCommand(argP1->c_str());
        this->HandlePredicate(
          command ? true : false,
          reducible, arg, newArgs, argP1, argP2);
        }
      // does a policy exist
      if (this->IsKeyword("POLICY", *arg) && argP1 != newArgs.end())
        {
        cmPolicies::PolicyID pid;
        this->HandlePredicate(
          cmPolicies::GetPolicyID(argP1->c_str(), pid),
            reducible, arg, newArgs, argP1, argP2);
        }
      // does a target exist
      if (this->IsKeyword("TARGET", *arg) && argP1 != newArgs.end())
        {
        this->HandlePredicate(
          this->Makefile.FindTargetToUse(argP1->GetValue())?true:false,
          reducible, arg, newArgs, argP1, argP2);
        }
      // is a variable defined
      if (this->IsKeyword("DEFINED", *arg) && argP1  != newArgs.end())
        {
        size_t argP1len = argP1->GetValue().size();
        bool bdef = false;
        if(argP1len > 4 && argP1->GetValue().substr(0, 4) == "ENV{" &&
           argP1->GetValue().operator[](argP1len-1) == '}')
          {
          std::string env = argP1->GetValue().substr(4, argP1len-5);
          bdef = cmSystemTools::GetEnv(env.c_str())?true:false;
          }
        else
          {
          bdef = this->Makefile.IsDefinitionSet(argP1->GetValue());
          }
        this->HandlePredicate(bdef, reducible, arg, newArgs, argP1, argP2);
        }
      ++arg;
      }
    }
  while (reducible);
  return true;
}

//=========================================================================
// level two handles most binary operations except for AND  OR
bool cmConditionEvaluator::HandleLevel2(cmArgumentList &newArgs,
                  std::string &errorString,
                  cmake::MessageType &status)
{
  int reducible;
  const char *def;
  const char *def2;
  do
    {
    reducible = 0;
    cmArgumentList::iterator arg = newArgs.begin();
    cmArgumentList::iterator argP1;
    cmArgumentList::iterator argP2;
    while (arg != newArgs.end())
      {
      argP1 = arg;
      this->IncrementArguments(newArgs,argP1,argP2);
      if (argP1 != newArgs.end() && argP2 != newArgs.end() &&
        IsKeyword("MATCHES", *argP1))
        {
        def = this->GetVariableOrString(*arg);
        const char* rex = argP2->c_str();
        this->Makefile.ClearMatches();
        cmsys::RegularExpression regEntry;
        if ( !regEntry.compile(rex) )
          {
          std::ostringstream error;
          error << "Regular expression \"" << rex << "\" cannot compile";
          errorString = error.str();
          status = cmake::FATAL_ERROR;
          return false;
          }
        if (regEntry.find(def))
          {
          this->Makefile.StoreMatches(regEntry);
          *arg = cmExpandedCommandArgument("1", true);
          }
        else
          {
          *arg = cmExpandedCommandArgument("0", true);
          }
        newArgs.erase(argP2);
        newArgs.erase(argP1);
        argP1 = arg;
        this->IncrementArguments(newArgs,argP1,argP2);
        reducible = 1;
        }

      if (argP1 != newArgs.end() && this->IsKeyword("MATCHES", *arg))
        {
        *arg = cmExpandedCommandArgument("0", true);
        newArgs.erase(argP1);
        argP1 = arg;
        this->IncrementArguments(newArgs,argP1,argP2);
        reducible = 1;
        }

      if (argP1 != newArgs.end() && argP2 != newArgs.end() &&
        (this->IsKeyword("LESS", *argP1) ||
         this->IsKeyword("GREATER", *argP1) ||
         this->IsKeyword("EQUAL", *argP1)))
        {
        def = this->GetVariableOrString(*arg);
        def2 = this->GetVariableOrString(*argP2);
        double lhs;
        double rhs;
        bool result;
        if(sscanf(def, "%lg", &lhs) != 1 ||
           sscanf(def2, "%lg", &rhs) != 1)
          {
          result = false;
          }
        else if (*(argP1) == "LESS")
          {
          result = (lhs < rhs);
          }
        else if (*(argP1) == "GREATER")
          {
          result = (lhs > rhs);
          }
        else
          {
          result = (lhs == rhs);
          }
        this->HandleBinaryOp(result,
          reducible, arg, newArgs, argP1, argP2);
        }

      if (argP1 != newArgs.end() && argP2 != newArgs.end() &&
        (this->IsKeyword("STRLESS", *argP1) ||
         this->IsKeyword("STREQUAL", *argP1) ||
         this->IsKeyword("STRGREATER", *argP1)))
        {
        def = this->GetVariableOrString(*arg);
        def2 = this->GetVariableOrString(*argP2);
        int val = strcmp(def,def2);
        bool result;
        if (*(argP1) == "STRLESS")
          {
          result = (val < 0);
          }
        else if (*(argP1) == "STRGREATER")
          {
          result = (val > 0);
          }
        else // strequal
          {
          result = (val == 0);
          }
        this->HandleBinaryOp(result,
          reducible, arg, newArgs, argP1, argP2);
        }

      if (argP1 != newArgs.end() && argP2 != newArgs.end() &&
        (this->IsKeyword("VERSION_LESS", *argP1) ||
         this->IsKeyword("VERSION_GREATER", *argP1) ||
         this->IsKeyword("VERSION_EQUAL", *argP1)))
        {
        def = this->GetVariableOrString(*arg);
        def2 = this->GetVariableOrString(*argP2);
        cmSystemTools::CompareOp op = cmSystemTools::OP_EQUAL;
        if(*argP1 == "VERSION_LESS")
          {
          op = cmSystemTools::OP_LESS;
          }
        else if(*argP1 == "VERSION_GREATER")
          {
          op = cmSystemTools::OP_GREATER;
          }
        bool result = cmSystemTools::VersionCompare(op, def, def2);
        this->HandleBinaryOp(result,
          reducible, arg, newArgs, argP1, argP2);
        }

      // is file A newer than file B
      if (argP1 != newArgs.end() && argP2 != newArgs.end() &&
          this->IsKeyword("IS_NEWER_THAN", *argP1))
        {
        int fileIsNewer=0;
        bool success=cmSystemTools::FileTimeCompare(arg->GetValue(),
            (argP2)->GetValue(),
            &fileIsNewer);
        this->HandleBinaryOp(
          (success==false || fileIsNewer==1 || fileIsNewer==0),
          reducible, arg, newArgs, argP1, argP2);
        }

      if (argP1 != newArgs.end() && argP2 != newArgs.end() &&
          this->IsKeyword("IN_LIST", *argP1))
        {
        if(this->Policy57Status != cmPolicies::OLD &&
          this->Policy57Status != cmPolicies::WARN)
          {
          bool result = false;

          def = this->GetVariableOrString(*arg);
          def2 = this->Makefile.GetDefinition(argP2->GetValue());

          if(def2)
            {
            std::vector<std::string> list;
            cmSystemTools::ExpandListArgument(def2, list, true);

            result = std::find(list.begin(), list.end(), def) != list.end();
            }

          this->HandleBinaryOp(result,
            reducible, arg, newArgs, argP1, argP2);
          }
          else if(this->Policy57Status == cmPolicies::WARN)
            {
            std::ostringstream e;
            e << cmPolicies::GetPolicyWarning(cmPolicies::CMP0057) << "\n";
            e << "IN_LIST will be interpreted as an operator "
              "when the policy is set to NEW.  "
              "Since the policy is not set the OLD behavior will be used.";

            this->Makefile.IssueMessage(cmake::AUTHOR_WARNING, e.str());
            }
        }

      ++arg;
      }
    }
  while (reducible);
  return true;
}

//=========================================================================
// level 3 handles NOT
bool cmConditionEvaluator::HandleLevel3(cmArgumentList &newArgs,
                  std::string &errorString,
                  cmake::MessageType &status)
{
  int reducible;
  do
    {
    reducible = 0;
    cmArgumentList::iterator arg = newArgs.begin();
    cmArgumentList::iterator argP1;
    cmArgumentList::iterator argP2;
    while (arg != newArgs.end())
      {
      argP1 = arg;
      IncrementArguments(newArgs,argP1,argP2);
      if (argP1 != newArgs.end() && IsKeyword("NOT", *arg))
        {
        bool rhs = this->GetBooleanValueWithAutoDereference(*argP1,
                                                      errorString,
                                                      status);
        this->HandlePredicate(!rhs, reducible, arg, newArgs, argP1, argP2);
        }
      ++arg;
      }
    }
  while (reducible);
  return true;
}

//=========================================================================
// level 4 handles AND OR
bool cmConditionEvaluator::HandleLevel4(cmArgumentList &newArgs,
                  std::string &errorString,
                  cmake::MessageType &status)
{
  int reducible;
  bool lhs;
  bool rhs;
  do
    {
    reducible = 0;
    cmArgumentList::iterator arg = newArgs.begin();
    cmArgumentList::iterator argP1;
    cmArgumentList::iterator argP2;
    while (arg != newArgs.end())
      {
      argP1 = arg;
      IncrementArguments(newArgs,argP1,argP2);
      if (argP1 != newArgs.end() && IsKeyword("AND", *argP1) &&
        argP2 != newArgs.end())
        {
        lhs = this->GetBooleanValueWithAutoDereference(*arg,
                                                 errorString,
                                                 status);
        rhs = this->GetBooleanValueWithAutoDereference(*argP2,
                                                 errorString,
                                                 status);
        this->HandleBinaryOp((lhs && rhs),
          reducible, arg, newArgs, argP1, argP2);
        }

      if (argP1 != newArgs.end() && this->IsKeyword("OR", *argP1) &&
        argP2 != newArgs.end())
        {
        lhs = this->GetBooleanValueWithAutoDereference(*arg,
                                                 errorString,
                                                 status);
        rhs = this->GetBooleanValueWithAutoDereference(*argP2,
                                                 errorString,
                                                 status);
        this->HandleBinaryOp((lhs || rhs),
          reducible, arg, newArgs, argP1, argP2);
        }
      ++arg;
      }
    }
  while (reducible);
  return true;
}