summaryrefslogtreecommitdiffstats
path: root/Lib/test/test_tokenize.py
blob: 8f74a06df586bd50885d3ec53631fc4c6c3f1c26 (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
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
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
doctests = """
Tests for the tokenize module.

The tests can be really simple. Given a small fragment of source
code, print out a table with tokens. The ENDMARKER is omitted for
brevity.

    >>> dump_tokens("1 + 1")
    ENCODING   'utf-8'       (0, 0) (0, 0)
    NUMBER     '1'           (1, 0) (1, 1)
    OP         '+'           (1, 2) (1, 3)
    NUMBER     '1'           (1, 4) (1, 5)

    >>> dump_tokens("if False:\\n"
    ...             "    # NL\\n"
    ...             "    True = False # NEWLINE\\n")
    ENCODING   'utf-8'       (0, 0) (0, 0)
    NAME       'if'          (1, 0) (1, 2)
    NAME       'False'       (1, 3) (1, 8)
    OP         ':'           (1, 8) (1, 9)
    NEWLINE    '\\n'          (1, 9) (1, 10)
    COMMENT    '# NL'        (2, 4) (2, 8)
    NL         '\\n'          (2, 8) (2, 9)
    INDENT     '    '        (3, 0) (3, 4)
    NAME       'True'        (3, 4) (3, 8)
    OP         '='           (3, 9) (3, 10)
    NAME       'False'       (3, 11) (3, 16)
    COMMENT    '# NEWLINE'   (3, 17) (3, 26)
    NEWLINE    '\\n'          (3, 26) (3, 27)
    DEDENT     ''            (4, 0) (4, 0)

    >>> indent_error_file = \"""
    ... def k(x):
    ...     x += 2
    ...   x += 5
    ... \"""
    >>> readline = BytesIO(indent_error_file.encode('utf-8')).readline
    >>> for tok in tokenize(readline): pass
    Traceback (most recent call last):
        ...
    IndentationError: unindent does not match any outer indentation level

There are some standard formatting practices that are easy to get right.

    >>> roundtrip("if x == 1:\\n"
    ...           "    print(x)\\n")
    True

    >>> roundtrip("# This is a comment\\n# This also")
    True

Some people use different formatting conventions, which makes
untokenize a little trickier. Note that this test involves trailing
whitespace after the colon. Note that we use hex escapes to make the
two trailing blanks apparent in the expected output.

    >>> roundtrip("if x == 1 : \\n"
    ...           "  print(x)\\n")
    True

    >>> f = support.findfile("tokenize_tests.txt")
    >>> roundtrip(open(f, 'rb'))
    True

    >>> roundtrip("if x == 1:\\n"
    ...           "    # A comment by itself.\\n"
    ...           "    print(x) # Comment here, too.\\n"
    ...           "    # Another comment.\\n"
    ...           "after_if = True\\n")
    True

    >>> roundtrip("if (x # The comments need to go in the right place\\n"
    ...           "    == 1):\\n"
    ...           "    print('x==1')\\n")
    True

    >>> roundtrip("class Test: # A comment here\\n"
    ...           "  # A comment with weird indent\\n"
    ...           "  after_com = 5\\n"
    ...           "  def x(m): return m*5 # a one liner\\n"
    ...           "  def y(m): # A whitespace after the colon\\n"
    ...           "     return y*4 # 3-space indent\\n")
    True

Some error-handling code

    >>> roundtrip("try: import somemodule\\n"
    ...           "except ImportError: # comment\\n"
    ...           "    print('Can not import' # comment2\\n)"
    ...           "else:   print('Loaded')\\n")
    True

Balancing continuation

    >>> roundtrip("a = (3,4, \\n"
    ...           "5,6)\\n"
    ...           "y = [3, 4,\\n"
    ...           "5]\\n"
    ...           "z = {'a': 5,\\n"
    ...           "'b':15, 'c':True}\\n"
    ...           "x = len(y) + 5 - a[\\n"
    ...           "3] - a[2]\\n"
    ...           "+ len(z) - z[\\n"
    ...           "'b']\\n")
    True

Ordinary integers and binary operators

    >>> dump_tokens("0xff <= 255")
    ENCODING   'utf-8'       (0, 0) (0, 0)
    NUMBER     '0xff'        (1, 0) (1, 4)
    OP         '<='          (1, 5) (1, 7)
    NUMBER     '255'         (1, 8) (1, 11)
    >>> dump_tokens("0b10 <= 255")
    ENCODING   'utf-8'       (0, 0) (0, 0)
    NUMBER     '0b10'        (1, 0) (1, 4)
    OP         '<='          (1, 5) (1, 7)
    NUMBER     '255'         (1, 8) (1, 11)
    >>> dump_tokens("0o123 <= 0O123")
    ENCODING   'utf-8'       (0, 0) (0, 0)
    NUMBER     '0o123'       (1, 0) (1, 5)
    OP         '<='          (1, 6) (1, 8)
    NUMBER     '0O123'       (1, 9) (1, 14)
    >>> dump_tokens("1234567 > ~0x15")
    ENCODING   'utf-8'       (0, 0) (0, 0)
    NUMBER     '1234567'     (1, 0) (1, 7)
    OP         '>'           (1, 8) (1, 9)
    OP         '~'           (1, 10) (1, 11)
    NUMBER     '0x15'        (1, 11) (1, 15)
    >>> dump_tokens("2134568 != 1231515")
    ENCODING   'utf-8'       (0, 0) (0, 0)
    NUMBER     '2134568'     (1, 0) (1, 7)
    OP         '!='          (1, 8) (1, 10)
    NUMBER     '1231515'     (1, 11) (1, 18)
    >>> dump_tokens("(-124561-1) & 200000000")
    ENCODING   'utf-8'       (0, 0) (0, 0)
    OP         '('           (1, 0) (1, 1)
    OP         '-'           (1, 1) (1, 2)
    NUMBER     '124561'      (1, 2) (1, 8)
    OP         '-'           (1, 8) (1, 9)
    NUMBER     '1'           (1, 9) (1, 10)
    OP         ')'           (1, 10) (1, 11)
    OP         '&'           (1, 12) (1, 13)
    NUMBER     '200000000'   (1, 14) (1, 23)
    >>> dump_tokens("0xdeadbeef != -1")
    ENCODING   'utf-8'       (0, 0) (0, 0)
    NUMBER     '0xdeadbeef'  (1, 0) (1, 10)
    OP         '!='          (1, 11) (1, 13)
    OP         '-'           (1, 14) (1, 15)
    NUMBER     '1'           (1, 15) (1, 16)
    >>> dump_tokens("0xdeadc0de & 12345")
    ENCODING   'utf-8'       (0, 0) (0, 0)
    NUMBER     '0xdeadc0de'  (1, 0) (1, 10)
    OP         '&'           (1, 11) (1, 12)
    NUMBER     '12345'       (1, 13) (1, 18)
    >>> dump_tokens("0xFF & 0x15 | 1234")
    ENCODING   'utf-8'       (0, 0) (0, 0)
    NUMBER     '0xFF'        (1, 0) (1, 4)
    OP         '&'           (1, 5) (1, 6)
    NUMBER     '0x15'        (1, 7) (1, 11)
    OP         '|'           (1, 12) (1, 13)
    NUMBER     '1234'        (1, 14) (1, 18)

Long integers

    >>> dump_tokens("x = 0")
    ENCODING   'utf-8'       (0, 0) (0, 0)
    NAME       'x'           (1, 0) (1, 1)
    OP         '='           (1, 2) (1, 3)
    NUMBER     '0'           (1, 4) (1, 5)
    >>> dump_tokens("x = 0xfffffffffff")
    ENCODING   'utf-8'       (0, 0) (0, 0)
    NAME       'x'           (1, 0) (1, 1)
    OP         '='           (1, 2) (1, 3)
    NUMBER     '0xffffffffff (1, 4) (1, 17)
    >>> dump_tokens("x = 123141242151251616110")
    ENCODING   'utf-8'       (0, 0) (0, 0)
    NAME       'x'           (1, 0) (1, 1)
    OP         '='           (1, 2) (1, 3)
    NUMBER     '123141242151 (1, 4) (1, 25)
    >>> dump_tokens("x = -15921590215012591")
    ENCODING   'utf-8'       (0, 0) (0, 0)
    NAME       'x'           (1, 0) (1, 1)
    OP         '='           (1, 2) (1, 3)
    OP         '-'           (1, 4) (1, 5)
    NUMBER     '159215902150 (1, 5) (1, 22)

Floating point numbers

    >>> dump_tokens("x = 3.14159")
    ENCODING   'utf-8'       (0, 0) (0, 0)
    NAME       'x'           (1, 0) (1, 1)
    OP         '='           (1, 2) (1, 3)
    NUMBER     '3.14159'     (1, 4) (1, 11)
    >>> dump_tokens("x = 314159.")
    ENCODING   'utf-8'       (0, 0) (0, 0)
    NAME       'x'           (1, 0) (1, 1)
    OP         '='           (1, 2) (1, 3)
    NUMBER     '314159.'     (1, 4) (1, 11)
    >>> dump_tokens("x = .314159")
    ENCODING   'utf-8'       (0, 0) (0, 0)
    NAME       'x'           (1, 0) (1, 1)
    OP         '='           (1, 2) (1, 3)
    NUMBER     '.314159'     (1, 4) (1, 11)
    >>> dump_tokens("x = 3e14159")
    ENCODING   'utf-8'       (0, 0) (0, 0)
    NAME       'x'           (1, 0) (1, 1)
    OP         '='           (1, 2) (1, 3)
    NUMBER     '3e14159'     (1, 4) (1, 11)
    >>> dump_tokens("x = 3E123")
    ENCODING   'utf-8'       (0, 0) (0, 0)
    NAME       'x'           (1, 0) (1, 1)
    OP         '='           (1, 2) (1, 3)
    NUMBER     '3E123'       (1, 4) (1, 9)
    >>> dump_tokens("x+y = 3e-1230")
    ENCODING   'utf-8'       (0, 0) (0, 0)
    NAME       'x'           (1, 0) (1, 1)
    OP         '+'           (1, 1) (1, 2)
    NAME       'y'           (1, 2) (1, 3)
    OP         '='           (1, 4) (1, 5)
    NUMBER     '3e-1230'     (1, 6) (1, 13)
    >>> dump_tokens("x = 3.14e159")
    ENCODING   'utf-8'       (0, 0) (0, 0)
    NAME       'x'           (1, 0) (1, 1)
    OP         '='           (1, 2) (1, 3)
    NUMBER     '3.14e159'    (1, 4) (1, 12)

String literals

    >>> dump_tokens("x = ''; y = \\\"\\\"")
    ENCODING   'utf-8'       (0, 0) (0, 0)
    NAME       'x'           (1, 0) (1, 1)
    OP         '='           (1, 2) (1, 3)
    STRING     "''"          (1, 4) (1, 6)
    OP         ';'           (1, 6) (1, 7)
    NAME       'y'           (1, 8) (1, 9)
    OP         '='           (1, 10) (1, 11)
    STRING     '""'          (1, 12) (1, 14)
    >>> dump_tokens("x = '\\\"'; y = \\\"'\\\"")
    ENCODING   'utf-8'       (0, 0) (0, 0)
    NAME       'x'           (1, 0) (1, 1)
    OP         '='           (1, 2) (1, 3)
    STRING     '\\'"\\''       (1, 4) (1, 7)
    OP         ';'           (1, 7) (1, 8)
    NAME       'y'           (1, 9) (1, 10)
    OP         '='           (1, 11) (1, 12)
    STRING     '"\\'"'        (1, 13) (1, 16)
    >>> dump_tokens("x = \\\"doesn't \\\"shrink\\\", does it\\\"")
    ENCODING   'utf-8'       (0, 0) (0, 0)
    NAME       'x'           (1, 0) (1, 1)
    OP         '='           (1, 2) (1, 3)
    STRING     '"doesn\\'t "' (1, 4) (1, 14)
    NAME       'shrink'      (1, 14) (1, 20)
    STRING     '", does it"' (1, 20) (1, 31)
    >>> dump_tokens("x = 'abc' + 'ABC'")
    ENCODING   'utf-8'       (0, 0) (0, 0)
    NAME       'x'           (1, 0) (1, 1)
    OP         '='           (1, 2) (1, 3)
    STRING     "'abc'"       (1, 4) (1, 9)
    OP         '+'           (1, 10) (1, 11)
    STRING     "'ABC'"       (1, 12) (1, 17)
    >>> dump_tokens('y = "ABC" + "ABC"')
    ENCODING   'utf-8'       (0, 0) (0, 0)
    NAME       'y'           (1, 0) (1, 1)
    OP         '='           (1, 2) (1, 3)
    STRING     '"ABC"'       (1, 4) (1, 9)
    OP         '+'           (1, 10) (1, 11)
    STRING     '"ABC"'       (1, 12) (1, 17)
    >>> dump_tokens("x = r'abc' + r'ABC' + R'ABC' + R'ABC'")
    ENCODING   'utf-8'       (0, 0) (0, 0)
    NAME       'x'           (1, 0) (1, 1)
    OP         '='           (1, 2) (1, 3)
    STRING     "r'abc'"      (1, 4) (1, 10)
    OP         '+'           (1, 11) (1, 12)
    STRING     "r'ABC'"      (1, 13) (1, 19)
    OP         '+'           (1, 20) (1, 21)
    STRING     "R'ABC'"      (1, 22) (1, 28)
    OP         '+'           (1, 29) (1, 30)
    STRING     "R'ABC'"      (1, 31) (1, 37)
    >>> dump_tokens('y = r"abc" + r"ABC" + R"ABC" + R"ABC"')
    ENCODING   'utf-8'       (0, 0) (0, 0)
    NAME       'y'           (1, 0) (1, 1)
    OP         '='           (1, 2) (1, 3)
    STRING     'r"abc"'      (1, 4) (1, 10)
    OP         '+'           (1, 11) (1, 12)
    STRING     'r"ABC"'      (1, 13) (1, 19)
    OP         '+'           (1, 20) (1, 21)
    STRING     'R"ABC"'      (1, 22) (1, 28)
    OP         '+'           (1, 29) (1, 30)
    STRING     'R"ABC"'      (1, 31) (1, 37)

    >>> dump_tokens("u'abc' + U'abc'")
    ENCODING   'utf-8'       (0, 0) (0, 0)
    STRING     "u'abc'"      (1, 0) (1, 6)
    OP         '+'           (1, 7) (1, 8)
    STRING     "U'abc'"      (1, 9) (1, 15)
    >>> dump_tokens('u"abc" + U"abc"')
    ENCODING   'utf-8'       (0, 0) (0, 0)
    STRING     'u"abc"'      (1, 0) (1, 6)
    OP         '+'           (1, 7) (1, 8)
    STRING     'U"abc"'      (1, 9) (1, 15)

    >>> dump_tokens("b'abc' + B'abc'")
    ENCODING   'utf-8'       (0, 0) (0, 0)
    STRING     "b'abc'"      (1, 0) (1, 6)
    OP         '+'           (1, 7) (1, 8)
    STRING     "B'abc'"      (1, 9) (1, 15)
    >>> dump_tokens('b"abc" + B"abc"')
    ENCODING   'utf-8'       (0, 0) (0, 0)
    STRING     'b"abc"'      (1, 0) (1, 6)
    OP         '+'           (1, 7) (1, 8)
    STRING     'B"abc"'      (1, 9) (1, 15)
    >>> dump_tokens("br'abc' + bR'abc' + Br'abc' + BR'abc'")
    ENCODING   'utf-8'       (0, 0) (0, 0)
    STRING     "br'abc'"     (1, 0) (1, 7)
    OP         '+'           (1, 8) (1, 9)
    STRING     "bR'abc'"     (1, 10) (1, 17)
    OP         '+'           (1, 18) (1, 19)
    STRING     "Br'abc'"     (1, 20) (1, 27)
    OP         '+'           (1, 28) (1, 29)
    STRING     "BR'abc'"     (1, 30) (1, 37)
    >>> dump_tokens('br"abc" + bR"abc" + Br"abc" + BR"abc"')
    ENCODING   'utf-8'       (0, 0) (0, 0)
    STRING     'br"abc"'     (1, 0) (1, 7)
    OP         '+'           (1, 8) (1, 9)
    STRING     'bR"abc"'     (1, 10) (1, 17)
    OP         '+'           (1, 18) (1, 19)
    STRING     'Br"abc"'     (1, 20) (1, 27)
    OP         '+'           (1, 28) (1, 29)
    STRING     'BR"abc"'     (1, 30) (1, 37)
    >>> dump_tokens("rb'abc' + rB'abc' + Rb'abc' + RB'abc'")
    ENCODING   'utf-8'       (0, 0) (0, 0)
    STRING     "rb'abc'"     (1, 0) (1, 7)
    OP         '+'           (1, 8) (1, 9)
    STRING     "rB'abc'"     (1, 10) (1, 17)
    OP         '+'           (1, 18) (1, 19)
    STRING     "Rb'abc'"     (1, 20) (1, 27)
    OP         '+'           (1, 28) (1, 29)
    STRING     "RB'abc'"     (1, 30) (1, 37)
    >>> dump_tokens('rb"abc" + rB"abc" + Rb"abc" + RB"abc"')
    ENCODING   'utf-8'       (0, 0) (0, 0)
    STRING     'rb"abc"'     (1, 0) (1, 7)
    OP         '+'           (1, 8) (1, 9)
    STRING     'rB"abc"'     (1, 10) (1, 17)
    OP         '+'           (1, 18) (1, 19)
    STRING     'Rb"abc"'     (1, 20) (1, 27)
    OP         '+'           (1, 28) (1, 29)
    STRING     'RB"abc"'     (1, 30) (1, 37)

Operators

    >>> dump_tokens("def d22(a, b, c=2, d=2, *k): pass")
    ENCODING   'utf-8'       (0, 0) (0, 0)
    NAME       'def'         (1, 0) (1, 3)
    NAME       'd22'         (1, 4) (1, 7)
    OP         '('           (1, 7) (1, 8)
    NAME       'a'           (1, 8) (1, 9)
    OP         ','           (1, 9) (1, 10)
    NAME       'b'           (1, 11) (1, 12)
    OP         ','           (1, 12) (1, 13)
    NAME       'c'           (1, 14) (1, 15)
    OP         '='           (1, 15) (1, 16)
    NUMBER     '2'           (1, 16) (1, 17)
    OP         ','           (1, 17) (1, 18)
    NAME       'd'           (1, 19) (1, 20)
    OP         '='           (1, 20) (1, 21)
    NUMBER     '2'           (1, 21) (1, 22)
    OP         ','           (1, 22) (1, 23)
    OP         '*'           (1, 24) (1, 25)
    NAME       'k'           (1, 25) (1, 26)
    OP         ')'           (1, 26) (1, 27)
    OP         ':'           (1, 27) (1, 28)
    NAME       'pass'        (1, 29) (1, 33)
    >>> dump_tokens("def d01v_(a=1, *k, **w): pass")
    ENCODING   'utf-8'       (0, 0) (0, 0)
    NAME       'def'         (1, 0) (1, 3)
    NAME       'd01v_'       (1, 4) (1, 9)
    OP         '('           (1, 9) (1, 10)
    NAME       'a'           (1, 10) (1, 11)
    OP         '='           (1, 11) (1, 12)
    NUMBER     '1'           (1, 12) (1, 13)
    OP         ','           (1, 13) (1, 14)
    OP         '*'           (1, 15) (1, 16)
    NAME       'k'           (1, 16) (1, 17)
    OP         ','           (1, 17) (1, 18)
    OP         '**'          (1, 19) (1, 21)
    NAME       'w'           (1, 21) (1, 22)
    OP         ')'           (1, 22) (1, 23)
    OP         ':'           (1, 23) (1, 24)
    NAME       'pass'        (1, 25) (1, 29)

Comparison

    >>> dump_tokens("if 1 < 1 > 1 == 1 >= 5 <= 0x15 <= 0x12 != " +
    ...             "1 and 5 in 1 not in 1 is 1 or 5 is not 1: pass")
    ENCODING   'utf-8'       (0, 0) (0, 0)
    NAME       'if'          (1, 0) (1, 2)
    NUMBER     '1'           (1, 3) (1, 4)
    OP         '<'           (1, 5) (1, 6)
    NUMBER     '1'           (1, 7) (1, 8)
    OP         '>'           (1, 9) (1, 10)
    NUMBER     '1'           (1, 11) (1, 12)
    OP         '=='          (1, 13) (1, 15)
    NUMBER     '1'           (1, 16) (1, 17)
    OP         '>='          (1, 18) (1, 20)
    NUMBER     '5'           (1, 21) (1, 22)
    OP         '<='          (1, 23) (1, 25)
    NUMBER     '0x15'        (1, 26) (1, 30)
    OP         '<='          (1, 31) (1, 33)
    NUMBER     '0x12'        (1, 34) (1, 38)
    OP         '!='          (1, 39) (1, 41)
    NUMBER     '1'           (1, 42) (1, 43)
    NAME       'and'         (1, 44) (1, 47)
    NUMBER     '5'           (1, 48) (1, 49)
    NAME       'in'          (1, 50) (1, 52)
    NUMBER     '1'           (1, 53) (1, 54)
    NAME       'not'         (1, 55) (1, 58)
    NAME       'in'          (1, 59) (1, 61)
    NUMBER     '1'           (1, 62) (1, 63)
    NAME       'is'          (1, 64) (1, 66)
    NUMBER     '1'           (1, 67) (1, 68)
    NAME       'or'          (1, 69) (1, 71)
    NUMBER     '5'           (1, 72) (1, 73)
    NAME       'is'          (1, 74) (1, 76)
    NAME       'not'         (1, 77) (1, 80)
    NUMBER     '1'           (1, 81) (1, 82)
    OP         ':'           (1, 82) (1, 83)
    NAME       'pass'        (1, 84) (1, 88)

Shift

    >>> dump_tokens("x = 1 << 1 >> 5")
    ENCODING   'utf-8'       (0, 0) (0, 0)
    NAME       'x'           (1, 0) (1, 1)
    OP         '='           (1, 2) (1, 3)
    NUMBER     '1'           (1, 4) (1, 5)
    OP         '<<'          (1, 6) (1, 8)
    NUMBER     '1'           (1, 9) (1, 10)
    OP         '>>'          (1, 11) (1, 13)
    NUMBER     '5'           (1, 14) (1, 15)

Additive

    >>> dump_tokens("x = 1 - y + 15 - 1 + 0x124 + z + a[5]")
    ENCODING   'utf-8'       (0, 0) (0, 0)
    NAME       'x'           (1, 0) (1, 1)
    OP         '='           (1, 2) (1, 3)
    NUMBER     '1'           (1, 4) (1, 5)
    OP         '-'           (1, 6) (1, 7)
    NAME       'y'           (1, 8) (1, 9)
    OP         '+'           (1, 10) (1, 11)
    NUMBER     '15'          (1, 12) (1, 14)
    OP         '-'           (1, 15) (1, 16)
    NUMBER     '1'           (1, 17) (1, 18)
    OP         '+'           (1, 19) (1, 20)
    NUMBER     '0x124'       (1, 21) (1, 26)
    OP         '+'           (1, 27) (1, 28)
    NAME       'z'           (1, 29) (1, 30)
    OP         '+'           (1, 31) (1, 32)
    NAME       'a'           (1, 33) (1, 34)
    OP         '['           (1, 34) (1, 35)
    NUMBER     '5'           (1, 35) (1, 36)
    OP         ']'           (1, 36) (1, 37)

Multiplicative

    >>> dump_tokens("x = 1//1*1/5*12%0x12@42")
    ENCODING   'utf-8'       (0, 0) (0, 0)
    NAME       'x'           (1, 0) (1, 1)
    OP         '='           (1, 2) (1, 3)
    NUMBER     '1'           (1, 4) (1, 5)
    OP         '//'          (1, 5) (1, 7)
    NUMBER     '1'           (1, 7) (1, 8)
    OP         '*'           (1, 8) (1, 9)
    NUMBER     '1'           (1, 9) (1, 10)
    OP         '/'           (1, 10) (1, 11)
    NUMBER     '5'           (1, 11) (1, 12)
    OP         '*'           (1, 12) (1, 13)
    NUMBER     '12'          (1, 13) (1, 15)
    OP         '%'           (1, 15) (1, 16)
    NUMBER     '0x12'        (1, 16) (1, 20)
    OP         '@'           (1, 20) (1, 21)
    NUMBER     '42'          (1, 21) (1, 23)

Unary

    >>> dump_tokens("~1 ^ 1 & 1 |1 ^ -1")
    ENCODING   'utf-8'       (0, 0) (0, 0)
    OP         '~'           (1, 0) (1, 1)
    NUMBER     '1'           (1, 1) (1, 2)
    OP         '^'           (1, 3) (1, 4)
    NUMBER     '1'           (1, 5) (1, 6)
    OP         '&'           (1, 7) (1, 8)
    NUMBER     '1'           (1, 9) (1, 10)
    OP         '|'           (1, 11) (1, 12)
    NUMBER     '1'           (1, 12) (1, 13)
    OP         '^'           (1, 14) (1, 15)
    OP         '-'           (1, 16) (1, 17)
    NUMBER     '1'           (1, 17) (1, 18)
    >>> dump_tokens("-1*1/1+1*1//1 - ---1**1")
    ENCODING   'utf-8'       (0, 0) (0, 0)
    OP         '-'           (1, 0) (1, 1)
    NUMBER     '1'           (1, 1) (1, 2)
    OP         '*'           (1, 2) (1, 3)
    NUMBER     '1'           (1, 3) (1, 4)
    OP         '/'           (1, 4) (1, 5)
    NUMBER     '1'           (1, 5) (1, 6)
    OP         '+'           (1, 6) (1, 7)
    NUMBER     '1'           (1, 7) (1, 8)
    OP         '*'           (1, 8) (1, 9)
    NUMBER     '1'           (1, 9) (1, 10)
    OP         '//'          (1, 10) (1, 12)
    NUMBER     '1'           (1, 12) (1, 13)
    OP         '-'           (1, 14) (1, 15)
    OP         '-'           (1, 16) (1, 17)
    OP         '-'           (1, 17) (1, 18)
    OP         '-'           (1, 18) (1, 19)
    NUMBER     '1'           (1, 19) (1, 20)
    OP         '**'          (1, 20) (1, 22)
    NUMBER     '1'           (1, 22) (1, 23)

Selector

    >>> dump_tokens("import sys, time\\nx = sys.modules['time'].time()")
    ENCODING   'utf-8'       (0, 0) (0, 0)
    NAME       'import'      (1, 0) (1, 6)
    NAME       'sys'         (1, 7) (1, 10)
    OP         ','           (1, 10) (1, 11)
    NAME       'time'        (1, 12) (1, 16)
    NEWLINE    '\\n'          (1, 16) (1, 17)
    NAME       'x'           (2, 0) (2, 1)
    OP         '='           (2, 2) (2, 3)
    NAME       'sys'         (2, 4) (2, 7)
    OP         '.'           (2, 7) (2, 8)
    NAME       'modules'     (2, 8) (2, 15)
    OP         '['           (2, 15) (2, 16)
    STRING     "'time'"      (2, 16) (2, 22)
    OP         ']'           (2, 22) (2, 23)
    OP         '.'           (2, 23) (2, 24)
    NAME       'time'        (2, 24) (2, 28)
    OP         '('           (2, 28) (2, 29)
    OP         ')'           (2, 29) (2, 30)

Methods

    >>> dump_tokens("@staticmethod\\ndef foo(x,y): pass")
    ENCODING   'utf-8'       (0, 0) (0, 0)
    OP         '@'           (1, 0) (1, 1)
    NAME       'staticmethod (1, 1) (1, 13)
    NEWLINE    '\\n'          (1, 13) (1, 14)
    NAME       'def'         (2, 0) (2, 3)
    NAME       'foo'         (2, 4) (2, 7)
    OP         '('           (2, 7) (2, 8)
    NAME       'x'           (2, 8) (2, 9)
    OP         ','           (2, 9) (2, 10)
    NAME       'y'           (2, 10) (2, 11)
    OP         ')'           (2, 11) (2, 12)
    OP         ':'           (2, 12) (2, 13)
    NAME       'pass'        (2, 14) (2, 18)

Backslash means line continuation, except for comments

    >>> roundtrip("x=1+\\\\n"
    ...           "1\\n"
    ...           "# This is a comment\\\\n"
    ...           "# This also\\n")
    True
    >>> roundtrip("# Comment \\\\nx = 0")
    True

Two string literals on the same line

    >>> roundtrip("'' ''")
    True

Test roundtrip on random python modules.
pass the '-ucpu' option to process the full directory.

    >>> import random
    >>> tempdir = os.path.dirname(f) or os.curdir
    >>> testfiles = glob.glob(os.path.join(tempdir, "test*.py"))

Tokenize is broken on test_pep3131.py because regular expressions are
broken on the obscure unicode identifiers in it. *sigh*
With roundtrip extended to test the 5-tuple mode of  untokenize,
7 more testfiles fail.  Remove them also until the failure is diagnosed.

    >>> testfiles.remove(os.path.join(tempdir, "test_pep3131.py"))
    >>> for f in ('buffer', 'builtin', 'fileio', 'inspect', 'os', 'platform', 'sys'):
    ...     testfiles.remove(os.path.join(tempdir, "test_%s.py") % f)
    ...
    >>> if not support.is_resource_enabled("cpu"):
    ...     testfiles = random.sample(testfiles, 10)
    ...
    >>> for testfile in testfiles:
    ...     if not roundtrip(open(testfile, 'rb')):
    ...         print("Roundtrip failed for file %s" % testfile)
    ...         break
    ... else: True
    True

Evil tabs

    >>> dump_tokens("def f():\\n\\tif x\\n        \\tpass")
    ENCODING   'utf-8'       (0, 0) (0, 0)
    NAME       'def'         (1, 0) (1, 3)
    NAME       'f'           (1, 4) (1, 5)
    OP         '('           (1, 5) (1, 6)
    OP         ')'           (1, 6) (1, 7)
    OP         ':'           (1, 7) (1, 8)
    NEWLINE    '\\n'          (1, 8) (1, 9)
    INDENT     '\\t'          (2, 0) (2, 1)
    NAME       'if'          (2, 1) (2, 3)
    NAME       'x'           (2, 4) (2, 5)
    NEWLINE    '\\n'          (2, 5) (2, 6)
    INDENT     '        \\t'  (3, 0) (3, 9)
    NAME       'pass'        (3, 9) (3, 13)
    DEDENT     ''            (4, 0) (4, 0)
    DEDENT     ''            (4, 0) (4, 0)

Non-ascii identifiers

    >>> dump_tokens("Örter = 'places'\\ngrün = 'green'")
    ENCODING   'utf-8'       (0, 0) (0, 0)
    NAME       'Örter'       (1, 0) (1, 5)
    OP         '='           (1, 6) (1, 7)
    STRING     "'places'"    (1, 8) (1, 16)
    NEWLINE    '\\n'          (1, 16) (1, 17)
    NAME       'grün'        (2, 0) (2, 4)
    OP         '='           (2, 5) (2, 6)
    STRING     "'green'"     (2, 7) (2, 14)

Legacy unicode literals:

    >>> dump_tokens("Örter = u'places'\\ngrün = U'green'")
    ENCODING   'utf-8'       (0, 0) (0, 0)
    NAME       'Örter'       (1, 0) (1, 5)
    OP         '='           (1, 6) (1, 7)
    STRING     "u'places'"   (1, 8) (1, 17)
    NEWLINE    '\\n'          (1, 17) (1, 18)
    NAME       'grün'        (2, 0) (2, 4)
    OP         '='           (2, 5) (2, 6)
    STRING     "U'green'"    (2, 7) (2, 15)
"""

from test import support
from tokenize import (tokenize, _tokenize, untokenize, NUMBER, NAME, OP,
                     STRING, ENDMARKER, ENCODING, tok_name, detect_encoding,
                     open as tokenize_open, Untokenizer)
from io import BytesIO
from unittest import TestCase
import os, sys, glob
import token

def dump_tokens(s):
    """Print out the tokens in s in a table format.

    The ENDMARKER is omitted.
    """
    f = BytesIO(s.encode('utf-8'))
    for type, token, start, end, line in tokenize(f.readline):
        if type == ENDMARKER:
            break
        type = tok_name[type]
        print("%(type)-10.10s %(token)-13.13r %(start)s %(end)s" % locals())

def roundtrip(f):
    """
    Test roundtrip for `untokenize`. `f` is an open file or a string.
    The source code in f is tokenized to both 5- and 2-tuples.
    Both sequences are converted back to source code via
    tokenize.untokenize(), and the latter tokenized again to 2-tuples.
    The test fails if the 3 pair tokenizations do not match.

    When untokenize bugs are fixed, untokenize with 5-tuples should
    reproduce code that does not contain a backslash continuation
    following spaces.  A proper test should test this.

    This function would be more useful for correcting bugs if it reported
    the first point of failure, like assertEqual, rather than just
    returning False -- or if it were only used in unittests and not
    doctest and actually used assertEqual.
    """
    # Get source code and original tokenizations
    if isinstance(f, str):
        code = f.encode('utf-8')
    else:
        code = f.read()
        f.close()
    readline = iter(code.splitlines(keepends=True)).__next__
    tokens5 = list(tokenize(readline))
    tokens2 = [tok[:2] for tok in tokens5]
    # Reproduce tokens2 from pairs
    bytes_from2 = untokenize(tokens2)
    readline2 = iter(bytes_from2.splitlines(keepends=True)).__next__
    tokens2_from2 = [tok[:2] for tok in tokenize(readline2)]
    # Reproduce tokens2 from 5-tuples
    bytes_from5 = untokenize(tokens5)
    readline5 = iter(bytes_from5.splitlines(keepends=True)).__next__
    tokens2_from5 = [tok[:2] for tok in tokenize(readline5)]
    # Compare 3 versions
    return tokens2 == tokens2_from2 == tokens2_from5

# This is an example from the docs, set up as a doctest.
def decistmt(s):
    """Substitute Decimals for floats in a string of statements.

    >>> from decimal import Decimal
    >>> s = 'print(+21.3e-5*-.1234/81.7)'
    >>> decistmt(s)
    "print (+Decimal ('21.3e-5')*-Decimal ('.1234')/Decimal ('81.7'))"

    The format of the exponent is inherited from the platform C library.
    Known cases are "e-007" (Windows) and "e-07" (not Windows).  Since
    we're only showing 11 digits, and the 12th isn't close to 5, the
    rest of the output should be platform-independent.

    >>> exec(s) #doctest: +ELLIPSIS
    -3.2171603427...e-0...7

    Output from calculations with Decimal should be identical across all
    platforms.

    >>> exec(decistmt(s))
    -3.217160342717258261933904529E-7
    """
    result = []
    g = tokenize(BytesIO(s.encode('utf-8')).readline)   # tokenize the string
    for toknum, tokval, _, _, _  in g:
        if toknum == NUMBER and '.' in tokval:  # replace NUMBER tokens
            result.extend([
                (NAME, 'Decimal'),
                (OP, '('),
                (STRING, repr(tokval)),
                (OP, ')')
            ])
        else:
            result.append((toknum, tokval))
    return untokenize(result).decode('utf-8')


class TestTokenizerAdheresToPep0263(TestCase):
    """
    Test that tokenizer adheres to the coding behaviour stipulated in PEP 0263.
    """

    def _testFile(self, filename):
        path = os.path.join(os.path.dirname(__file__), filename)
        return roundtrip(open(path, 'rb'))

    def test_utf8_coding_cookie_and_no_utf8_bom(self):
        f = 'tokenize_tests-utf8-coding-cookie-and-no-utf8-bom-sig.txt'
        self.assertTrue(self._testFile(f))

    def test_latin1_coding_cookie_and_utf8_bom(self):
        """
        As per PEP 0263, if a file starts with a utf-8 BOM signature, the only
        allowed encoding for the comment is 'utf-8'.  The text file used in
        this test starts with a BOM signature, but specifies latin1 as the
        coding, so verify that a SyntaxError is raised, which matches the
        behaviour of the interpreter when it encounters a similar condition.
        """
        f = 'tokenize_tests-latin1-coding-cookie-and-utf8-bom-sig.txt'
        self.assertRaises(SyntaxError, self._testFile, f)

    def test_no_coding_cookie_and_utf8_bom(self):
        f = 'tokenize_tests-no-coding-cookie-and-utf8-bom-sig-only.txt'
        self.assertTrue(self._testFile(f))

    def test_utf8_coding_cookie_and_utf8_bom(self):
        f = 'tokenize_tests-utf8-coding-cookie-and-utf8-bom-sig.txt'
        self.assertTrue(self._testFile(f))

    def test_bad_coding_cookie(self):
        self.assertRaises(SyntaxError, self._testFile, 'bad_coding.py')
        self.assertRaises(SyntaxError, self._testFile, 'bad_coding2.py')


class Test_Tokenize(TestCase):

    def test__tokenize_decodes_with_specified_encoding(self):
        literal = '"ЉЊЈЁЂ"'
        line = literal.encode('utf-8')
        first = False
        def readline():
            nonlocal first
            if not first:
                first = True
                return line
            else:
                return b''

        # skip the initial encoding token and the end token
        tokens = list(_tokenize(readline, encoding='utf-8'))[1:-1]
        expected_tokens = [(3, '"ЉЊЈЁЂ"', (1, 0), (1, 7), '"ЉЊЈЁЂ"')]
        self.assertEqual(tokens, expected_tokens,
                         "bytes not decoded with encoding")

    def test__tokenize_does_not_decode_with_encoding_none(self):
        literal = '"ЉЊЈЁЂ"'
        first = False
        def readline():
            nonlocal first
            if not first:
                first = True
                return literal
            else:
                return b''

        # skip the end token
        tokens = list(_tokenize(readline, encoding=None))[:-1]
        expected_tokens = [(3, '"ЉЊЈЁЂ"', (1, 0), (1, 7), '"ЉЊЈЁЂ"')]
        self.assertEqual(tokens, expected_tokens,
                         "string not tokenized when encoding is None")


class TestDetectEncoding(TestCase):

    def get_readline(self, lines):
        index = 0
        def readline():
            nonlocal index
            if index == len(lines):
                raise StopIteration
            line = lines[index]
            index += 1
            return line
        return readline

    def test_no_bom_no_encoding_cookie(self):
        lines = (
            b'# something\n',
            b'print(something)\n',
            b'do_something(else)\n'
        )
        encoding, consumed_lines = detect_encoding(self.get_readline(lines))
        self.assertEqual(encoding, 'utf-8')
        self.assertEqual(consumed_lines, list(lines[:2]))

    def test_bom_no_cookie(self):
        lines = (
            b'\xef\xbb\xbf# something\n',
            b'print(something)\n',
            b'do_something(else)\n'
        )
        encoding, consumed_lines = detect_encoding(self.get_readline(lines))
        self.assertEqual(encoding, 'utf-8-sig')
        self.assertEqual(consumed_lines,
                         [b'# something\n', b'print(something)\n'])

    def test_cookie_first_line_no_bom(self):
        lines = (
            b'# -*- coding: latin-1 -*-\n',
            b'print(something)\n',
            b'do_something(else)\n'
        )
        encoding, consumed_lines = detect_encoding(self.get_readline(lines))
        self.assertEqual(encoding, 'iso-8859-1')
        self.assertEqual(consumed_lines, [b'# -*- coding: latin-1 -*-\n'])

    def test_matched_bom_and_cookie_first_line(self):
        lines = (
            b'\xef\xbb\xbf# coding=utf-8\n',
            b'print(something)\n',
            b'do_something(else)\n'
        )
        encoding, consumed_lines = detect_encoding(self.get_readline(lines))
        self.assertEqual(encoding, 'utf-8-sig')
        self.assertEqual(consumed_lines, [b'# coding=utf-8\n'])

    def test_mismatched_bom_and_cookie_first_line_raises_syntaxerror(self):
        lines = (
            b'\xef\xbb\xbf# vim: set fileencoding=ascii :\n',
            b'print(something)\n',
            b'do_something(else)\n'
        )
        readline = self.get_readline(lines)
        self.assertRaises(SyntaxError, detect_encoding, readline)

    def test_cookie_second_line_no_bom(self):
        lines = (
            b'#! something\n',
            b'# vim: set fileencoding=ascii :\n',
            b'print(something)\n',
            b'do_something(else)\n'
        )
        encoding, consumed_lines = detect_encoding(self.get_readline(lines))
        self.assertEqual(encoding, 'ascii')
        expected = [b'#! something\n', b'# vim: set fileencoding=ascii :\n']
        self.assertEqual(consumed_lines, expected)

    def test_matched_bom_and_cookie_second_line(self):
        lines = (
            b'\xef\xbb\xbf#! something\n',
            b'f# coding=utf-8\n',
            b'print(something)\n',
            b'do_something(else)\n'
        )
        encoding, consumed_lines = detect_encoding(self.get_readline(lines))
        self.assertEqual(encoding, 'utf-8-sig')
        self.assertEqual(consumed_lines,
                         [b'#! something\n', b'f# coding=utf-8\n'])

    def test_mismatched_bom_and_cookie_second_line_raises_syntaxerror(self):
        lines = (
            b'\xef\xbb\xbf#! something\n',
            b'# vim: set fileencoding=ascii :\n',
            b'print(something)\n',
            b'do_something(else)\n'
        )
        readline = self.get_readline(lines)
        self.assertRaises(SyntaxError, detect_encoding, readline)

    def test_cookie_second_line_noncommented_first_line(self):
        lines = (
            b"print('\xc2\xa3')\n",
            b'# vim: set fileencoding=iso8859-15 :\n',
            b"print('\xe2\x82\xac')\n"
        )
        encoding, consumed_lines = detect_encoding(self.get_readline(lines))
        self.assertEqual(encoding, 'utf-8')
        expected = [b"print('\xc2\xa3')\n"]
        self.assertEqual(consumed_lines, expected)

    def test_cookie_second_line_commented_first_line(self):
        lines = (
            b"#print('\xc2\xa3')\n",
            b'# vim: set fileencoding=iso8859-15 :\n',
            b"print('\xe2\x82\xac')\n"
        )
        encoding, consumed_lines = detect_encoding(self.get_readline(lines))
        self.assertEqual(encoding, 'iso8859-15')
        expected = [b"#print('\xc2\xa3')\n", b'# vim: set fileencoding=iso8859-15 :\n']
        self.assertEqual(consumed_lines, expected)

    def test_cookie_second_line_empty_first_line(self):
        lines = (
            b'\n',
            b'# vim: set fileencoding=iso8859-15 :\n',
            b"print('\xe2\x82\xac')\n"
        )
        encoding, consumed_lines = detect_encoding(self.get_readline(lines))
        self.assertEqual(encoding, 'iso8859-15')
        expected = [b'\n', b'# vim: set fileencoding=iso8859-15 :\n']
        self.assertEqual(consumed_lines, expected)

    def test_latin1_normalization(self):
        # See get_normal_name() in tokenizer.c.
        encodings = ("latin-1", "iso-8859-1", "iso-latin-1", "latin-1-unix",
                     "iso-8859-1-unix", "iso-latin-1-mac")
        for encoding in encodings:
            for rep in ("-", "_"):
                enc = encoding.replace("-", rep)
                lines = (b"#!/usr/bin/python\n",
                         b"# coding: " + enc.encode("ascii") + b"\n",
                         b"print(things)\n",
                         b"do_something += 4\n")
                rl = self.get_readline(lines)
                found, consumed_lines = detect_encoding(rl)
                self.assertEqual(found, "iso-8859-1")

    def test_syntaxerror_latin1(self):
        # Issue 14629: need to raise SyntaxError if the first
        # line(s) have non-UTF-8 characters
        lines = (
            b'print("\xdf")', # Latin-1: LATIN SMALL LETTER SHARP S
            )
        readline = self.get_readline(lines)
        self.assertRaises(SyntaxError, detect_encoding, readline)


    def test_utf8_normalization(self):
        # See get_normal_name() in tokenizer.c.
        encodings = ("utf-8", "utf-8-mac", "utf-8-unix")
        for encoding in encodings:
            for rep in ("-", "_"):
                enc = encoding.replace("-", rep)
                lines = (b"#!/usr/bin/python\n",
                         b"# coding: " + enc.encode("ascii") + b"\n",
                         b"1 + 3\n")
                rl = self.get_readline(lines)
                found, consumed_lines = detect_encoding(rl)
                self.assertEqual(found, "utf-8")

    def test_short_files(self):
        readline = self.get_readline((b'print(something)\n',))
        encoding, consumed_lines = detect_encoding(readline)
        self.assertEqual(encoding, 'utf-8')
        self.assertEqual(consumed_lines, [b'print(something)\n'])

        encoding, consumed_lines = detect_encoding(self.get_readline(()))
        self.assertEqual(encoding, 'utf-8')
        self.assertEqual(consumed_lines, [])

        readline = self.get_readline((b'\xef\xbb\xbfprint(something)\n',))
        encoding, consumed_lines = detect_encoding(readline)
        self.assertEqual(encoding, 'utf-8-sig')
        self.assertEqual(consumed_lines, [b'print(something)\n'])

        readline = self.get_readline((b'\xef\xbb\xbf',))
        encoding, consumed_lines = detect_encoding(readline)
        self.assertEqual(encoding, 'utf-8-sig')
        self.assertEqual(consumed_lines, [])

        readline = self.get_readline((b'# coding: bad\n',))
        self.assertRaises(SyntaxError, detect_encoding, readline)

    def test_false_encoding(self):
        # Issue 18873: "Encoding" detected in non-comment lines
        readline = self.get_readline((b'print("#coding=fake")',))
        encoding, consumed_lines = detect_encoding(readline)
        self.assertEqual(encoding, 'utf-8')
        self.assertEqual(consumed_lines, [b'print("#coding=fake")'])

    def test_open(self):
        filename = support.TESTFN + '.py'
        self.addCleanup(support.unlink, filename)

        # test coding cookie
        for encoding in ('iso-8859-15', 'utf-8'):
            with open(filename, 'w', encoding=encoding) as fp:
                print("# coding: %s" % encoding, file=fp)
                print("print('euro:\u20ac')", file=fp)
            with tokenize_open(filename) as fp:
                self.assertEqual(fp.encoding, encoding)
                self.assertEqual(fp.mode, 'r')

        # test BOM (no coding cookie)
        with open(filename, 'w', encoding='utf-8-sig') as fp:
            print("print('euro:\u20ac')", file=fp)
        with tokenize_open(filename) as fp:
            self.assertEqual(fp.encoding, 'utf-8-sig')
            self.assertEqual(fp.mode, 'r')

    def test_filename_in_exception(self):
        # When possible, include the file name in the exception.
        path = 'some_file_path'
        lines = (
            b'print("\xdf")', # Latin-1: LATIN SMALL LETTER SHARP S
            )
        class Bunk:
            def __init__(self, lines, path):
                self.name = path
                self._lines = lines
                self._index = 0

            def readline(self):
                if self._index == len(lines):
                    raise StopIteration
                line = lines[self._index]
                self._index += 1
                return line

        with self.assertRaises(SyntaxError):
            ins = Bunk(lines, path)
            # Make sure lacking a name isn't an issue.
            del ins.name
            detect_encoding(ins.readline)
        with self.assertRaisesRegex(SyntaxError, '.*{}'.format(path)):
            ins = Bunk(lines, path)
            detect_encoding(ins.readline)


class TestTokenize(TestCase):

    def test_tokenize(self):
        import tokenize as tokenize_module
        encoding = object()
        encoding_used = None
        def mock_detect_encoding(readline):
            return encoding, ['first', 'second']

        def mock__tokenize(readline, encoding):
            nonlocal encoding_used
            encoding_used = encoding
            out = []
            while True:
                next_line = readline()
                if next_line:
                    out.append(next_line)
                    continue
                return out

        counter = 0
        def mock_readline():
            nonlocal counter
            counter += 1
            if counter == 5:
                return b''
            return counter

        orig_detect_encoding = tokenize_module.detect_encoding
        orig__tokenize = tokenize_module._tokenize
        tokenize_module.detect_encoding = mock_detect_encoding
        tokenize_module._tokenize = mock__tokenize
        try:
            results = tokenize(mock_readline)
            self.assertEqual(list(results), ['first', 'second', 1, 2, 3, 4])
        finally:
            tokenize_module.detect_encoding = orig_detect_encoding
            tokenize_module._tokenize = orig__tokenize

        self.assertTrue(encoding_used, encoding)

    def assertExactTypeEqual(self, opstr, *optypes):
        tokens = list(tokenize(BytesIO(opstr.encode('utf-8')).readline))
        num_optypes = len(optypes)
        self.assertEqual(len(tokens), 2 + num_optypes)
        self.assertEqual(token.tok_name[tokens[0].exact_type],
                         token.tok_name[ENCODING])
        for i in range(num_optypes):
            self.assertEqual(token.tok_name[tokens[i + 1].exact_type],
                             token.tok_name[optypes[i]])
        self.assertEqual(token.tok_name[tokens[1 + num_optypes].exact_type],
                         token.tok_name[token.ENDMARKER])

    def test_exact_type(self):
        self.assertExactTypeEqual('()', token.LPAR, token.RPAR)
        self.assertExactTypeEqual('[]', token.LSQB, token.RSQB)
        self.assertExactTypeEqual(':', token.COLON)
        self.assertExactTypeEqual(',', token.COMMA)
        self.assertExactTypeEqual(';', token.SEMI)
        self.assertExactTypeEqual('+', token.PLUS)
        self.assertExactTypeEqual('-', token.MINUS)
        self.assertExactTypeEqual('*', token.STAR)
        self.assertExactTypeEqual('/', token.SLASH)
        self.assertExactTypeEqual('|', token.VBAR)
        self.assertExactTypeEqual('&', token.AMPER)
        self.assertExactTypeEqual('<', token.LESS)
        self.assertExactTypeEqual('>', token.GREATER)
        self.assertExactTypeEqual('=', token.EQUAL)
        self.assertExactTypeEqual('.', token.DOT)
        self.assertExactTypeEqual('%', token.PERCENT)
        self.assertExactTypeEqual('{}', token.LBRACE, token.RBRACE)
        self.assertExactTypeEqual('==', token.EQEQUAL)
        self.assertExactTypeEqual('!=', token.NOTEQUAL)
        self.assertExactTypeEqual('<=', token.LESSEQUAL)
        self.assertExactTypeEqual('>=', token.GREATEREQUAL)
        self.assertExactTypeEqual('~', token.TILDE)
        self.assertExactTypeEqual('^', token.CIRCUMFLEX)
        self.assertExactTypeEqual('<<', token.LEFTSHIFT)
        self.assertExactTypeEqual('>>', token.RIGHTSHIFT)
        self.assertExactTypeEqual('**', token.DOUBLESTAR)
        self.assertExactTypeEqual('+=', token.PLUSEQUAL)
        self.assertExactTypeEqual('-=', token.MINEQUAL)
        self.assertExactTypeEqual('*=', token.STAREQUAL)
        self.assertExactTypeEqual('/=', token.SLASHEQUAL)
        self.assertExactTypeEqual('%=', token.PERCENTEQUAL)
        self.assertExactTypeEqual('&=', token.AMPEREQUAL)
        self.assertExactTypeEqual('|=', token.VBAREQUAL)
        self.assertExactTypeEqual('^=', token.CIRCUMFLEXEQUAL)
        self.assertExactTypeEqual('^=', token.CIRCUMFLEXEQUAL)
        self.assertExactTypeEqual('<<=', token.LEFTSHIFTEQUAL)
        self.assertExactTypeEqual('>>=', token.RIGHTSHIFTEQUAL)
        self.assertExactTypeEqual('**=', token.DOUBLESTAREQUAL)
        self.assertExactTypeEqual('//', token.DOUBLESLASH)
        self.assertExactTypeEqual('//=', token.DOUBLESLASHEQUAL)
        self.assertExactTypeEqual('@', token.AT)
        self.assertExactTypeEqual('@=', token.ATEQUAL)

        self.assertExactTypeEqual('a**2+b**2==c**2',
                                  NAME, token.DOUBLESTAR, NUMBER,
                                  token.PLUS,
                                  NAME, token.DOUBLESTAR, NUMBER,
                                  token.EQEQUAL,
                                  NAME, token.DOUBLESTAR, NUMBER)
        self.assertExactTypeEqual('{1, 2, 3}',
                                  token.LBRACE,
                                  token.NUMBER, token.COMMA,
                                  token.NUMBER, token.COMMA,
                                  token.NUMBER,
                                  token.RBRACE)
        self.assertExactTypeEqual('^(x & 0x1)',
                                  token.CIRCUMFLEX,
                                  token.LPAR,
                                  token.NAME, token.AMPER, token.NUMBER,
                                  token.RPAR)

    def test_pathological_trailing_whitespace(self):
        # See http://bugs.python.org/issue16152
        self.assertExactTypeEqual('@          ', token.AT)

class UntokenizeTest(TestCase):

    def test_bad_input_order(self):
        # raise if previous row
        u = Untokenizer()
        u.prev_row = 2
        u.prev_col = 2
        with self.assertRaises(ValueError) as cm:
            u.add_whitespace((1,3))
        self.assertEqual(cm.exception.args[0],
                'start (1,3) precedes previous end (2,2)')
        # raise if previous column in row
        self.assertRaises(ValueError, u.add_whitespace, (2,1))

    def test_backslash_continuation(self):
        # The problem is that <whitespace>\<newline> leaves no token
        u = Untokenizer()
        u.prev_row = 1
        u.prev_col =  1
        u.tokens = []
        u.add_whitespace((2, 0))
        self.assertEqual(u.tokens, ['\\\n'])
        u.prev_row = 2
        u.add_whitespace((4, 4))
        self.assertEqual(u.tokens, ['\\\n', '\\\n\\\n', '    '])
        self.assertTrue(roundtrip('a\n  b\n    c\n  \\\n  c\n'))

    def test_iter_compat(self):
        u = Untokenizer()
        token = (NAME, 'Hello')
        tokens = [(ENCODING, 'utf-8'), token]
        u.compat(token, iter([]))
        self.assertEqual(u.tokens, ["Hello "])
        u = Untokenizer()
        self.assertEqual(u.untokenize(iter([token])), 'Hello ')
        u = Untokenizer()
        self.assertEqual(u.untokenize(iter(tokens)), 'Hello ')
        self.assertEqual(u.encoding, 'utf-8')
        self.assertEqual(untokenize(iter(tokens)), b'Hello ')


__test__ = {"doctests" : doctests, 'decistmt': decistmt}

def test_main():
    from test import test_tokenize
    support.run_doctest(test_tokenize, True)
    support.run_unittest(TestTokenizerAdheresToPep0263)
    support.run_unittest(Test_Tokenize)
    support.run_unittest(TestDetectEncoding)
    support.run_unittest(TestTokenize)
    support.run_unittest(UntokenizeTest)

if __name__ == "__main__":
    test_main()