File: coverage.py

package info (click to toggle)
python-coverage 2.80-2
  • links: PTS
  • area: main
  • in suites: lenny
  • size: 124 kB
  • ctags: 109
  • sloc: python: 730; makefile: 7
file content (1122 lines) | stat: -rwxr-xr-x 41,874 bytes parent folder | download
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
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
#             Perforce Defect Tracking Integration Project
#              <http://www.ravenbrook.com/project/p4dti/>
#
#                   COVERAGE.PY -- COVERAGE TESTING
#
#             Gareth Rees, Ravenbrook Limited, 2001-12-04
#                     Ned Batchelder, 2004-12-12
#         http://nedbatchelder.com/code/modules/coverage.html
#
#
# 1. INTRODUCTION
#
# This module provides coverage testing for Python code.
#
# The intended readership is all Python developers.
#
# This document is not confidential.
#
# See [GDR 2001-12-04a] for the command-line interface, programmatic
# interface and limitations.  See [GDR 2001-12-04b] for requirements and
# design.

r"""Usage:

coverage.py -x [-p] MODULE.py [ARG1 ARG2 ...]
    Execute module, passing the given command-line arguments, collecting
    coverage data. With the -p option, write to a temporary file containing
    the machine name and process ID.

coverage.py -e
    Erase collected coverage data.

coverage.py -c
    Collect data from multiple coverage files (as created by -p option above)
    and store it into a single file representing the union of the coverage.

coverage.py -r [-m] [-o dir1,dir2,...] FILE1 FILE2 ...
    Report on the statement coverage for the given files.  With the -m
    option, show line numbers of the statements that weren't executed.

coverage.py -a [-d dir] [-o dir1,dir2,...] FILE1 FILE2 ...
    Make annotated copies of the given files, marking statements that
    are executed with > and statements that are missed with !.  With
    the -d option, make the copies in that directory.  Without the -d
    option, make each copy in the same directory as the original.

-o dir,dir2,...
  Omit reporting or annotating files when their filename path starts with
  a directory listed in the omit list.
  e.g. python coverage.py -i -r -o c:\python23,lib\enthought\traits

Coverage data is saved in the file .coverage by default.  Set the
COVERAGE_FILE environment variable to save it somewhere else."""

__version__ = "2.80.20080525"    # see detailed history at the end of this file.

import compiler
import compiler.visitor
import glob
import os
import re
import string
import symbol
import sys
import threading
import token
import types
from socket import gethostname

# Python version compatibility
try:
    strclass = basestring   # new to 2.3
except:
    strclass = str

# 2. IMPLEMENTATION
#
# This uses the "singleton" pattern.
#
# The word "morf" means a module object (from which the source file can
# be deduced by suitable manipulation of the __file__ attribute) or a
# filename.
#
# When we generate a coverage report we have to canonicalize every
# filename in the coverage dictionary just in case it refers to the
# module we are reporting on.  It seems a shame to throw away this
# information so the data in the coverage dictionary is transferred to
# the 'cexecuted' dictionary under the canonical filenames.
#
# The coverage dictionary is called "c" and the trace function "t".  The
# reason for these short names is that Python looks up variables by name
# at runtime and so execution time depends on the length of variables!
# In the bottleneck of this application it's appropriate to abbreviate
# names to increase speed.

class StatementFindingAstVisitor(compiler.visitor.ASTVisitor):
    """ A visitor for a parsed Abstract Syntax Tree which finds executable
        statements.
    """
    def __init__(self, statements, excluded, suite_spots):
        compiler.visitor.ASTVisitor.__init__(self)
        self.statements = statements
        self.excluded = excluded
        self.suite_spots = suite_spots
        self.excluding_suite = 0
        
    def doRecursive(self, node):
        for n in node.getChildNodes():
            self.dispatch(n)

    visitStmt = visitModule = doRecursive
    
    def doCode(self, node):
        if hasattr(node, 'decorators') and node.decorators:
            self.dispatch(node.decorators)
            self.recordAndDispatch(node.code)
        else:
            self.doSuite(node, node.code)
            
    visitFunction = visitClass = doCode

    def getFirstLine(self, node):
        # Find the first line in the tree node.
        lineno = node.lineno
        for n in node.getChildNodes():
            f = self.getFirstLine(n)
            if lineno and f:
                lineno = min(lineno, f)
            else:
                lineno = lineno or f
        return lineno

    def getLastLine(self, node):
        # Find the first line in the tree node.
        lineno = node.lineno
        for n in node.getChildNodes():
            lineno = max(lineno, self.getLastLine(n))
        return lineno
    
    def doStatement(self, node):
        self.recordLine(self.getFirstLine(node))

    visitAssert = visitAssign = visitAssTuple = visitPrint = \
        visitPrintnl = visitRaise = visitSubscript = visitDecorators = \
        doStatement
    
    def visitPass(self, node):
        # Pass statements have weird interactions with docstrings.  If this
        # pass statement is part of one of those pairs, claim that the statement
        # is on the later of the two lines.
        l = node.lineno
        if l:
            lines = self.suite_spots.get(l, [l,l])
            self.statements[lines[1]] = 1
        
    def visitDiscard(self, node):
        # Discard nodes are statements that execute an expression, but then
        # discard the results.  This includes function calls, so we can't 
        # ignore them all.  But if the expression is a constant, the statement
        # won't be "executed", so don't count it now.
        if node.expr.__class__.__name__ != 'Const':
            self.doStatement(node)

    def recordNodeLine(self, node):
        # Stmt nodes often have None, but shouldn't claim the first line of
        # their children (because the first child might be an ignorable line
        # like "global a").
        if node.__class__.__name__ != 'Stmt':
            return self.recordLine(self.getFirstLine(node))
        else:
            return 0
    
    def recordLine(self, lineno):
        # Returns a bool, whether the line is included or excluded.
        if lineno:
            # Multi-line tests introducing suites have to get charged to their
            # keyword.
            if lineno in self.suite_spots:
                lineno = self.suite_spots[lineno][0]
            # If we're inside an excluded suite, record that this line was
            # excluded.
            if self.excluding_suite:
                self.excluded[lineno] = 1
                return 0
            # If this line is excluded, or suite_spots maps this line to
            # another line that is exlcuded, then we're excluded.
            elif self.excluded.has_key(lineno) or \
                 self.suite_spots.has_key(lineno) and \
                 self.excluded.has_key(self.suite_spots[lineno][1]):
                return 0
            # Otherwise, this is an executable line.
            else:
                self.statements[lineno] = 1
                return 1
        return 0
    
    default = recordNodeLine
    
    def recordAndDispatch(self, node):
        self.recordNodeLine(node)
        self.dispatch(node)

    def doSuite(self, intro, body, exclude=0):
        exsuite = self.excluding_suite
        if exclude or (intro and not self.recordNodeLine(intro)):
            self.excluding_suite = 1
        self.recordAndDispatch(body)
        self.excluding_suite = exsuite
        
    def doPlainWordSuite(self, prevsuite, suite):
        # Finding the exclude lines for else's is tricky, because they aren't
        # present in the compiler parse tree.  Look at the previous suite,
        # and find its last line.  If any line between there and the else's
        # first line are excluded, then we exclude the else.
        lastprev = self.getLastLine(prevsuite)
        firstelse = self.getFirstLine(suite)
        for l in range(lastprev+1, firstelse):
            if self.suite_spots.has_key(l):
                self.doSuite(None, suite, exclude=self.excluded.has_key(l))
                break
        else:
            self.doSuite(None, suite)
        
    def doElse(self, prevsuite, node):
        if node.else_:
            self.doPlainWordSuite(prevsuite, node.else_)
    
    def visitFor(self, node):
        self.doSuite(node, node.body)
        self.doElse(node.body, node)

    visitWhile = visitFor

    def visitIf(self, node):
        # The first test has to be handled separately from the rest.
        # The first test is credited to the line with the "if", but the others
        # are credited to the line with the test for the elif.
        self.doSuite(node, node.tests[0][1])
        for t, n in node.tests[1:]:
            self.doSuite(t, n)
        self.doElse(node.tests[-1][1], node)

    def visitTryExcept(self, node):
        self.doSuite(node, node.body)
        for i in range(len(node.handlers)):
            a, b, h = node.handlers[i]
            if not a:
                # It's a plain "except:".  Find the previous suite.
                if i > 0:
                    prev = node.handlers[i-1][2]
                else:
                    prev = node.body
                self.doPlainWordSuite(prev, h)
            else:
                self.doSuite(a, h)
        self.doElse(node.handlers[-1][2], node)
    
    def visitTryFinally(self, node):
        self.doSuite(node, node.body)
        self.doPlainWordSuite(node.body, node.final)
        
    def visitWith(self, node):
        self.doSuite(node, node.body)
        
    def visitGlobal(self, node):
        # "global" statements don't execute like others (they don't call the
        # trace function), so don't record their line numbers.
        pass

the_coverage = None

class CoverageException(Exception): pass

class coverage:
    # Name of the cache file (unless environment variable is set).
    cache_default = ".coverage"

    # Environment variable naming the cache file.
    cache_env = "COVERAGE_FILE"

    # A dictionary with an entry for (Python source file name, line number
    # in that file) if that line has been executed.
    c = {}
    
    # A map from canonical Python source file name to a dictionary in
    # which there's an entry for each line number that has been
    # executed.
    cexecuted = {}

    # Cache of results of calling the analysis2() method, so that you can
    # specify both -r and -a without doing double work.
    analysis_cache = {}

    # Cache of results of calling the canonical_filename() method, to
    # avoid duplicating work.
    canonical_filename_cache = {}

    def __init__(self):
        global the_coverage
        if the_coverage:
            raise CoverageException("Only one coverage object allowed.")
        self.usecache = 1
        self.cache = None
        self.parallel_mode = False
        self.exclude_re = ''
        self.nesting = 0
        self.cstack = []
        self.xstack = []
        self.relative_dir = os.path.normcase(os.path.abspath(os.curdir)+os.sep)
        self.exclude('# *pragma[: ]*[nN][oO] *[cC][oO][vV][eE][rR]')

    # t(f, x, y).  This method is passed to sys.settrace as a trace function.  
    # See [van Rossum 2001-07-20b, 9.2] for an explanation of sys.settrace and 
    # the arguments and return value of the trace function.
    # See [van Rossum 2001-07-20a, 3.2] for a description of frame and code
    # objects.
    
    def t(self, f, w, unused):                                 #pragma: no cover
        if w == 'line':
            self.c[(f.f_code.co_filename, f.f_lineno)] = 1
            #-for c in self.cstack:
            #-    c[(f.f_code.co_filename, f.f_lineno)] = 1
        return self.t
    
    def help(self, error=None):     #pragma: no cover
        if error:
            print error
            print
        print __doc__
        sys.exit(1)

    def command_line(self, argv, help_fn=None):
        import getopt
        help_fn = help_fn or self.help
        settings = {}
        optmap = {
            '-a': 'annotate',
            '-c': 'collect',
            '-d:': 'directory=',
            '-e': 'erase',
            '-h': 'help',
            '-i': 'ignore-errors',
            '-m': 'show-missing',
            '-p': 'parallel-mode',
            '-r': 'report',
            '-x': 'execute',
            '-o:': 'omit=',
            }
        short_opts = string.join(map(lambda o: o[1:], optmap.keys()), '')
        long_opts = optmap.values()
        options, args = getopt.getopt(argv, short_opts, long_opts)
        for o, a in options:
            if optmap.has_key(o):
                settings[optmap[o]] = 1
            elif optmap.has_key(o + ':'):
                settings[optmap[o + ':']] = a
            elif o[2:] in long_opts:
                settings[o[2:]] = 1
            elif o[2:] + '=' in long_opts:
                settings[o[2:]+'='] = a
            else:       #pragma: no cover
                pass    # Can't get here, because getopt won't return anything unknown.

        if settings.get('help'):
            help_fn()

        for i in ['erase', 'execute']:
            for j in ['annotate', 'report', 'collect']:
                if settings.get(i) and settings.get(j):
                    help_fn("You can't specify the '%s' and '%s' "
                              "options at the same time." % (i, j))

        args_needed = (settings.get('execute')
                       or settings.get('annotate')
                       or settings.get('report'))
        action = (settings.get('erase') 
                  or settings.get('collect')
                  or args_needed)
        if not action:
            help_fn("You must specify at least one of -e, -x, -c, -r, or -a.")
        if not args_needed and args:
            help_fn("Unexpected arguments: %s" % " ".join(args))
        
        self.parallel_mode = settings.get('parallel-mode')
        self.get_ready()

        if settings.get('erase'):
            self.erase()
        if settings.get('execute'):
            if not args:
                help_fn("Nothing to do.")
            sys.argv = args
            self.start()
            import __main__
            sys.path[0] = os.path.dirname(sys.argv[0])
            execfile(sys.argv[0], __main__.__dict__)
        if settings.get('collect'):
            self.collect()
        if not args:
            args = self.cexecuted.keys()
        
        ignore_errors = settings.get('ignore-errors')
        show_missing = settings.get('show-missing')
        directory = settings.get('directory=')

        omit = settings.get('omit=')
        if omit is not None:
            omit = omit.split(',')
        else:
            omit = []

        if settings.get('report'):
            self.report(args, show_missing, ignore_errors, omit_prefixes=omit)
        if settings.get('annotate'):
            self.annotate(args, directory, ignore_errors, omit_prefixes=omit)

    def use_cache(self, usecache, cache_file=None):
        self.usecache = usecache
        if cache_file and not self.cache:
            self.cache_default = cache_file
        
    def get_ready(self, parallel_mode=False):
        if self.usecache and not self.cache:
            self.cache = os.environ.get(self.cache_env, self.cache_default)
            if self.parallel_mode:
                self.cache += "." + gethostname() + "." + str(os.getpid())
            self.restore()
        self.analysis_cache = {}
        
    def start(self, parallel_mode=False):
        self.get_ready()
        if self.nesting == 0:                               #pragma: no cover
            sys.settrace(self.t)
            if hasattr(threading, 'settrace'):
                threading.settrace(self.t)
        self.nesting += 1
        
    def stop(self):
        self.nesting -= 1
        if self.nesting == 0:                               #pragma: no cover
            sys.settrace(None)
            if hasattr(threading, 'settrace'):
                threading.settrace(None)

    def erase(self):
        self.get_ready()
        self.c = {}
        self.analysis_cache = {}
        self.cexecuted = {}
        if self.cache and os.path.exists(self.cache):
            os.remove(self.cache)

    def exclude(self, re):
        if self.exclude_re:
            self.exclude_re += "|"
        self.exclude_re += "(" + re + ")"

    def begin_recursive(self):
        self.cstack.append(self.c)
        self.xstack.append(self.exclude_re)
        
    def end_recursive(self):
        self.c = self.cstack.pop()
        self.exclude_re = self.xstack.pop()

    # save().  Save coverage data to the coverage cache.

    def save(self):
        if self.usecache and self.cache:
            self.canonicalize_filenames()
            cache = open(self.cache, 'wb')
            import marshal
            marshal.dump(self.cexecuted, cache)
            cache.close()

    # restore().  Restore coverage data from the coverage cache (if it exists).

    def restore(self):
        self.c = {}
        self.cexecuted = {}
        assert self.usecache
        if os.path.exists(self.cache):
            self.cexecuted = self.restore_file(self.cache)

    def restore_file(self, file_name):
        try:
            cache = open(file_name, 'rb')
            import marshal
            cexecuted = marshal.load(cache)
            cache.close()
            if isinstance(cexecuted, types.DictType):
                return cexecuted
            else:
                return {}
        except:
            return {}

    # collect(). Collect data in multiple files produced by parallel mode

    def collect(self):
        cache_dir, local = os.path.split(self.cache)
        for f in os.listdir(cache_dir or '.'):
            if not f.startswith(local):
                continue

            full_path = os.path.join(cache_dir, f)
            cexecuted = self.restore_file(full_path)
            self.merge_data(cexecuted)

    def merge_data(self, new_data):
        for file_name, file_data in new_data.items():
            if self.cexecuted.has_key(file_name):
                self.merge_file_data(self.cexecuted[file_name], file_data)
            else:
                self.cexecuted[file_name] = file_data

    def merge_file_data(self, cache_data, new_data):
        for line_number in new_data.keys():
            if not cache_data.has_key(line_number):
                cache_data[line_number] = new_data[line_number]

    # canonical_filename(filename).  Return a canonical filename for the
    # file (that is, an absolute path with no redundant components and
    # normalized case).  See [GDR 2001-12-04b, 3.3].

    def canonical_filename(self, filename):
        if not self.canonical_filename_cache.has_key(filename):
            f = filename
            if os.path.isabs(f) and not os.path.exists(f):
                f = os.path.basename(f)
            if not os.path.isabs(f):
                for path in [os.curdir] + sys.path:
                    g = os.path.join(path, f)
                    if os.path.exists(g):
                        f = g
                        break
            cf = os.path.normcase(os.path.abspath(f))
            self.canonical_filename_cache[filename] = cf
        return self.canonical_filename_cache[filename]

    # canonicalize_filenames().  Copy results from "c" to "cexecuted", 
    # canonicalizing filenames on the way.  Clear the "c" map.

    def canonicalize_filenames(self):
        for filename, lineno in self.c.keys():
            if filename == '<string>':
                # Can't do anything useful with exec'd strings, so skip them.
                continue
            f = self.canonical_filename(filename)
            if not self.cexecuted.has_key(f):
                self.cexecuted[f] = {}
            self.cexecuted[f][lineno] = 1
        self.c = {}

    # morf_filename(morf).  Return the filename for a module or file.

    def morf_filename(self, morf):
        if isinstance(morf, types.ModuleType):
            if not hasattr(morf, '__file__'):
                raise CoverageException("Module has no __file__ attribute.")
            f = morf.__file__
        else:
            f = morf
        return self.canonical_filename(f)

    # analyze_morf(morf).  Analyze the module or filename passed as
    # the argument.  If the source code can't be found, raise an error.
    # Otherwise, return a tuple of (1) the canonical filename of the
    # source code for the module, (2) a list of lines of statements
    # in the source code, (3) a list of lines of excluded statements,
    # and (4), a map of line numbers to multi-line line number ranges, for
    # statements that cross lines.
    
    def analyze_morf(self, morf):
        if self.analysis_cache.has_key(morf):
            return self.analysis_cache[morf]
        filename = self.morf_filename(morf)
        ext = os.path.splitext(filename)[1]
        if ext == '.pyc':
            if not os.path.exists(filename[:-1]):
                raise CoverageException(
                    "No source for compiled code '%s'." % filename
                    )
            filename = filename[:-1]
        source = open(filename, 'rU')
        try:
            lines, excluded_lines, line_map = self.find_executable_statements(
                source.read(), exclude=self.exclude_re
                )
        except SyntaxError, synerr:
            raise CoverageException(
                "Couldn't parse '%s' as Python source: '%s' at line %d" %
                    (filename, synerr.msg, synerr.lineno)
                )            
        source.close()
        result = filename, lines, excluded_lines, line_map
        self.analysis_cache[morf] = result
        return result

    def first_line_of_tree(self, tree):
        while True:
            if len(tree) == 3 and type(tree[2]) == type(1):
                return tree[2]
            tree = tree[1]
    
    def last_line_of_tree(self, tree):
        while True:
            if len(tree) == 3 and type(tree[2]) == type(1):
                return tree[2]
            tree = tree[-1]
    
    def find_docstring_pass_pair(self, tree, spots):
        for i in range(1, len(tree)):
            if self.is_string_constant(tree[i]) and self.is_pass_stmt(tree[i+1]):
                first_line = self.first_line_of_tree(tree[i])
                last_line = self.last_line_of_tree(tree[i+1])
                self.record_multiline(spots, first_line, last_line)
        
    def is_string_constant(self, tree):
        try:
            return tree[0] == symbol.stmt and tree[1][1][1][0] == symbol.expr_stmt
        except:
            return False
        
    def is_pass_stmt(self, tree):
        try:
            return tree[0] == symbol.stmt and tree[1][1][1][0] == symbol.pass_stmt
        except:
            return False

    def record_multiline(self, spots, i, j):
        for l in range(i, j+1):
            spots[l] = (i, j)
            
    def get_suite_spots(self, tree, spots):
        """ Analyze a parse tree to find suite introducers which span a number
            of lines.
        """
        for i in range(1, len(tree)):
            if type(tree[i]) == type(()):
                if tree[i][0] == symbol.suite:
                    # Found a suite, look back for the colon and keyword.
                    lineno_colon = lineno_word = None
                    for j in range(i-1, 0, -1):
                        if tree[j][0] == token.COLON:
                            # Colons are never executed themselves: we want the
                            # line number of the last token before the colon.
                            lineno_colon = self.last_line_of_tree(tree[j-1])
                        elif tree[j][0] == token.NAME:
                            if tree[j][1] == 'elif':
                                # Find the line number of the first non-terminal
                                # after the keyword.
                                t = tree[j+1]
                                while t and token.ISNONTERMINAL(t[0]):
                                    t = t[1]
                                if t:
                                    lineno_word = t[2]
                            else:
                                lineno_word = tree[j][2]
                            break
                        elif tree[j][0] == symbol.except_clause:
                            # "except" clauses look like:
                            # ('except_clause', ('NAME', 'except', lineno), ...)
                            if tree[j][1][0] == token.NAME:
                                lineno_word = tree[j][1][2]
                                break
                    if lineno_colon and lineno_word:
                        # Found colon and keyword, mark all the lines
                        # between the two with the two line numbers.
                        self.record_multiline(spots, lineno_word, lineno_colon)

                    # "pass" statements are tricky: different versions of Python
                    # treat them differently, especially in the common case of a
                    # function with a doc string and a single pass statement.
                    self.find_docstring_pass_pair(tree[i], spots)
                    
                elif tree[i][0] == symbol.simple_stmt:
                    first_line = self.first_line_of_tree(tree[i])
                    last_line = self.last_line_of_tree(tree[i])
                    if first_line != last_line:
                        self.record_multiline(spots, first_line, last_line)
                self.get_suite_spots(tree[i], spots)

    def find_executable_statements(self, text, exclude=None):
        # Find lines which match an exclusion pattern.
        excluded = {}
        suite_spots = {}
        if exclude:
            reExclude = re.compile(exclude)
            lines = text.split('\n')
            for i in range(len(lines)):
                if reExclude.search(lines[i]):
                    excluded[i+1] = 1

        # Parse the code and analyze the parse tree to find out which statements
        # are multiline, and where suites begin and end.
        import parser
        tree = parser.suite(text+'\n\n').totuple(1)
        self.get_suite_spots(tree, suite_spots)
        #print "Suite spots:", suite_spots
        
        # Use the compiler module to parse the text and find the executable
        # statements.  We add newlines to be impervious to final partial lines.
        statements = {}
        ast = compiler.parse(text+'\n\n')
        visitor = StatementFindingAstVisitor(statements, excluded, suite_spots)
        compiler.walk(ast, visitor, walker=visitor)

        lines = statements.keys()
        lines.sort()
        excluded_lines = excluded.keys()
        excluded_lines.sort()
        return lines, excluded_lines, suite_spots

    # format_lines(statements, lines).  Format a list of line numbers
    # for printing by coalescing groups of lines as long as the lines
    # represent consecutive statements.  This will coalesce even if
    # there are gaps between statements, so if statements =
    # [1,2,3,4,5,10,11,12,13,14] and lines = [1,2,5,10,11,13,14] then
    # format_lines will return "1-2, 5-11, 13-14".

    def format_lines(self, statements, lines):
        pairs = []
        i = 0
        j = 0
        start = None
        pairs = []
        while i < len(statements) and j < len(lines):
            if statements[i] == lines[j]:
                if start == None:
                    start = lines[j]
                end = lines[j]
                j = j + 1
            elif start:
                pairs.append((start, end))
                start = None
            i = i + 1
        if start:
            pairs.append((start, end))
        def stringify(pair):
            start, end = pair
            if start == end:
                return "%d" % start
            else:
                return "%d-%d" % (start, end)
        ret = string.join(map(stringify, pairs), ", ")
        return ret

    # Backward compatibility with version 1.
    def analysis(self, morf):
        f, s, _, m, mf = self.analysis2(morf)
        return f, s, m, mf

    def analysis2(self, morf):
        filename, statements, excluded, line_map = self.analyze_morf(morf)
        self.canonicalize_filenames()
        if not self.cexecuted.has_key(filename):
            self.cexecuted[filename] = {}
        missing = []
        for line in statements:
            lines = line_map.get(line, [line, line])
            for l in range(lines[0], lines[1]+1):
                if self.cexecuted[filename].has_key(l):
                    break
            else:
                missing.append(line)
        return (filename, statements, excluded, missing,
                self.format_lines(statements, missing))

    def relative_filename(self, filename):
        """ Convert filename to relative filename from self.relative_dir.
        """
        return filename.replace(self.relative_dir, "")

    def morf_name(self, morf):
        """ Return the name of morf as used in report.
        """
        if isinstance(morf, types.ModuleType):
            return morf.__name__
        else:
            return self.relative_filename(os.path.splitext(morf)[0])

    def filter_by_prefix(self, morfs, omit_prefixes):
        """ Return list of morfs where the morf name does not begin
            with any one of the omit_prefixes.
        """
        filtered_morfs = []
        for morf in morfs:
            for prefix in omit_prefixes:
                if self.morf_name(morf).startswith(prefix):
                    break
            else:
                filtered_morfs.append(morf)

        return filtered_morfs

    def morf_name_compare(self, x, y):
        return cmp(self.morf_name(x), self.morf_name(y))

    def report(self, morfs, show_missing=1, ignore_errors=0, file=None, omit_prefixes=[]):
        if not isinstance(morfs, types.ListType):
            morfs = [morfs]
        # On windows, the shell doesn't expand wildcards.  Do it here.
        globbed = []
        for morf in morfs:
            if isinstance(morf, strclass):
                globbed.extend(glob.glob(morf))
            else:
                globbed.append(morf)
        morfs = globbed
        
        morfs = self.filter_by_prefix(morfs, omit_prefixes)
        morfs.sort(self.morf_name_compare)

        max_name = max([5,] + map(len, map(self.morf_name, morfs)))
        fmt_name = "%%- %ds  " % max_name
        fmt_err = fmt_name + "%s: %s"
        header = fmt_name % "Name" + " Stmts   Exec  Cover"
        fmt_coverage = fmt_name + "% 6d % 6d % 5d%%"
        if show_missing:
            header = header + "   Missing"
            fmt_coverage = fmt_coverage + "   %s"
        if not file:
            file = sys.stdout
        print >>file, header
        print >>file, "-" * len(header)
        total_statements = 0
        total_executed = 0
        for morf in morfs:
            name = self.morf_name(morf)
            try:
                _, statements, _, missing, readable  = self.analysis2(morf)
                n = len(statements)
                m = n - len(missing)
                if n > 0:
                    pc = 100.0 * m / n
                else:
                    pc = 100.0
                args = (name, n, m, pc)
                if show_missing:
                    args = args + (readable,)
                print >>file, fmt_coverage % args
                total_statements = total_statements + n
                total_executed = total_executed + m
            except KeyboardInterrupt:                       #pragma: no cover
                raise
            except:
                if not ignore_errors:
                    typ, msg = sys.exc_info()[:2]
                    print >>file, fmt_err % (name, typ, msg)
        if len(morfs) > 1:
            print >>file, "-" * len(header)
            if total_statements > 0:
                pc = 100.0 * total_executed / total_statements
            else:
                pc = 100.0
            args = ("TOTAL", total_statements, total_executed, pc)
            if show_missing:
                args = args + ("",)
            print >>file, fmt_coverage % args

    # annotate(morfs, ignore_errors).

    blank_re = re.compile(r"\s*(#|$)")
    else_re = re.compile(r"\s*else\s*:\s*(#|$)")

    def annotate(self, morfs, directory=None, ignore_errors=0, omit_prefixes=[]):
        morfs = self.filter_by_prefix(morfs, omit_prefixes)
        for morf in morfs:
            try:
                filename, statements, excluded, missing, _ = self.analysis2(morf)
                self.annotate_file(filename, statements, excluded, missing, directory)
            except KeyboardInterrupt:
                raise
            except:
                if not ignore_errors:
                    raise
                
    def annotate_file(self, filename, statements, excluded, missing, directory=None):
        source = open(filename, 'r')
        if directory:
            dest_file = os.path.join(directory,
                                     os.path.basename(filename)
                                     + ',cover')
        else:
            dest_file = filename + ',cover'
        dest = open(dest_file, 'w')
        lineno = 0
        i = 0
        j = 0
        covered = 1
        while 1:
            line = source.readline()
            if line == '':
                break
            lineno = lineno + 1
            while i < len(statements) and statements[i] < lineno:
                i = i + 1
            while j < len(missing) and missing[j] < lineno:
                j = j + 1
            if i < len(statements) and statements[i] == lineno:
                covered = j >= len(missing) or missing[j] > lineno
            if self.blank_re.match(line):
                dest.write('  ')
            elif self.else_re.match(line):
                # Special logic for lines containing only 'else:'.  
                # See [GDR 2001-12-04b, 3.2].
                if i >= len(statements) and j >= len(missing):
                    dest.write('! ')
                elif i >= len(statements) or j >= len(missing):
                    dest.write('> ')
                elif statements[i] == missing[j]:
                    dest.write('! ')
                else:
                    dest.write('> ')
            elif lineno in excluded:
                dest.write('- ')
            elif covered:
                dest.write('> ')
            else:
                dest.write('! ')
            dest.write(line)
        source.close()
        dest.close()

# Singleton object.
the_coverage = coverage()

# Module functions call methods in the singleton object.
def use_cache(*args, **kw): 
    return the_coverage.use_cache(*args, **kw)

def start(*args, **kw): 
    return the_coverage.start(*args, **kw)

def stop(*args, **kw): 
    return the_coverage.stop(*args, **kw)

def erase(*args, **kw): 
    return the_coverage.erase(*args, **kw)

def begin_recursive(*args, **kw): 
    return the_coverage.begin_recursive(*args, **kw)

def end_recursive(*args, **kw): 
    return the_coverage.end_recursive(*args, **kw)

def exclude(*args, **kw): 
    return the_coverage.exclude(*args, **kw)

def analysis(*args, **kw): 
    return the_coverage.analysis(*args, **kw)

def analysis2(*args, **kw): 
    return the_coverage.analysis2(*args, **kw)

def report(*args, **kw): 
    return the_coverage.report(*args, **kw)

def annotate(*args, **kw): 
    return the_coverage.annotate(*args, **kw)

def annotate_file(*args, **kw): 
    return the_coverage.annotate_file(*args, **kw)

# Save coverage data when Python exits.  (The atexit module wasn't
# introduced until Python 2.0, so use sys.exitfunc when it's not
# available.)
try:
    import atexit
    atexit.register(the_coverage.save)
except ImportError:
    sys.exitfunc = the_coverage.save

def main():
    the_coverage.command_line(sys.argv[1:])
    
# Command-line interface.
if __name__ == '__main__':
    main()


# A. REFERENCES
#
# [GDR 2001-12-04a] "Statement coverage for Python"; Gareth Rees;
# Ravenbrook Limited; 2001-12-04;
# <http://www.nedbatchelder.com/code/modules/rees-coverage.html>.
#
# [GDR 2001-12-04b] "Statement coverage for Python: design and
# analysis"; Gareth Rees; Ravenbrook Limited; 2001-12-04;
# <http://www.nedbatchelder.com/code/modules/rees-design.html>.
#
# [van Rossum 2001-07-20a] "Python Reference Manual (releae 2.1.1)";
# Guide van Rossum; 2001-07-20;
# <http://www.python.org/doc/2.1.1/ref/ref.html>.
#
# [van Rossum 2001-07-20b] "Python Library Reference"; Guido van Rossum;
# 2001-07-20; <http://www.python.org/doc/2.1.1/lib/lib.html>.
#
#
# B. DOCUMENT HISTORY
#
# 2001-12-04 GDR Created.
#
# 2001-12-06 GDR Added command-line interface and source code
# annotation.
#
# 2001-12-09 GDR Moved design and interface to separate documents.
#
# 2001-12-10 GDR Open cache file as binary on Windows.  Allow
# simultaneous -e and -x, or -a and -r.
#
# 2001-12-12 GDR Added command-line help.  Cache analysis so that it
# only needs to be done once when you specify -a and -r.
#
# 2001-12-13 GDR Improved speed while recording.  Portable between
# Python 1.5.2 and 2.1.1.
#
# 2002-01-03 GDR Module-level functions work correctly.
#
# 2002-01-07 GDR Update sys.path when running a file with the -x option,
# so that it matches the value the program would get if it were run on
# its own.
#
# 2004-12-12 NMB Significant code changes.
# - Finding executable statements has been rewritten so that docstrings and
#   other quirks of Python execution aren't mistakenly identified as missing
#   lines.
# - Lines can be excluded from consideration, even entire suites of lines.
# - The filesystem cache of covered lines can be disabled programmatically.
# - Modernized the code.
#
# 2004-12-14 NMB Minor tweaks.  Return 'analysis' to its original behavior
# and add 'analysis2'.  Add a global for 'annotate', and factor it, adding
# 'annotate_file'.
#
# 2004-12-31 NMB Allow for keyword arguments in the module global functions.
# Thanks, Allen.
#
# 2005-12-02 NMB Call threading.settrace so that all threads are measured.
# Thanks Martin Fuzzey. Add a file argument to report so that reports can be 
# captured to a different destination.
#
# 2005-12-03 NMB coverage.py can now measure itself.
#
# 2005-12-04 NMB Adapted Greg Rogers' patch for using relative filenames,
# and sorting and omitting files to report on.
#
# 2006-07-23 NMB Applied Joseph Tate's patch for function decorators.
#
# 2006-08-21 NMB Applied Sigve Tjora and Mark van der Wal's fixes for argument
# handling.
#
# 2006-08-22 NMB Applied Geoff Bache's parallel mode patch.
#
# 2006-08-23 NMB Refactorings to improve testability.  Fixes to command-line
# logic for parallel mode and collect.
#
# 2006-08-25 NMB "#pragma: nocover" is excluded by default.
#
# 2006-09-10 NMB Properly ignore docstrings and other constant expressions that
# appear in the middle of a function, a problem reported by Tim Leslie.
# Minor changes to avoid lint warnings.
#
# 2006-09-17 NMB coverage.erase() shouldn't clobber the exclude regex.
# Change how parallel mode is invoked, and fix erase() so that it erases the
# cache when called programmatically.
#
# 2007-07-21 NMB In reports, ignore code executed from strings, since we can't
# do anything useful with it anyway.
# Better file handling on Linux, thanks Guillaume Chazarain.
# Better shell support on Windows, thanks Noel O'Boyle.
# Python 2.2 support maintained, thanks Catherine Proulx.
#
# 2007-07-22 NMB Python 2.5 now fully supported. The method of dealing with
# multi-line statements is now less sensitive to the exact line that Python
# reports during execution. Pass statements are handled specially so that their
# disappearance during execution won't throw off the measurement.
#
# 2007-07-23 NMB Now Python 2.5 is *really* fully supported: the body of the
# new with statement is counted as executable.
#
# 2007-07-29 NMB Better packaging.
#
# 2007-09-30 NMB Don't try to predict whether a file is Python source based on
# the extension. Extensionless files are often Pythons scripts. Instead, simply
# parse the file and catch the syntax errors.  Hat tip to Ben Finney.
#
# 2008-05-25 NMB Open files in rU mode to avoid line ending craziness.
# Thanks, Edward Loper.
#
# C. COPYRIGHT AND LICENCE
#
# Copyright 2001 Gareth Rees.  All rights reserved.
# Copyright 2004-2008 Ned Batchelder.  All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are
# met:
#
# 1. Redistributions of source code must retain the above copyright
#    notice, this list of conditions and the following disclaimer.
#
# 2. Redistributions in binary form must reproduce the above copyright
#    notice, this list of conditions and the following disclaimer in the
#    documentation and/or other materials provided with the
#    distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
# HOLDERS AND CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
# BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
# OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
# ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
# TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
# USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
# DAMAGE.
#
# $Id: coverage.py 93 2008-05-25 21:32:09Z nedbat $