Repository navigation
Expand file tree
/
Copy path_strptime.py
More file actions
853 lines (786 loc) · 36.1 KB
/
Copy path_strptime.py
File metadata and controls
853 lines (786 loc) · 36.1 KB
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
"""Strptime-related classes and functions.
CLASSES:
LocaleTime -- Discovers and stores locale-specific time information
TimeRE -- Creates regexes for pattern matching a string of text containing
time information
FUNCTIONS:
_getlang -- Figure out what language is being used for the locale
_strptime -- Calculates the time struct represented by the passed-in string
"""
import os
import time
import locale
import calendar
import re
from re import compile as re_compile
from re import sub as re_sub
from re import IGNORECASE
from re import escape as re_escape
from datetime import (date as datetime_date,
timedelta as datetime_timedelta,
timezone as datetime_timezone)
from _thread import allocate_lock as _thread_allocate_lock
__all__ = []
def _getlang():
# Figure out what the current language is set to.
return locale.getlocale(locale.LC_TIME)
def _findall(haystack, needle):
# Find all positions of needle in haystack.
if not needle:
return
i = 0
while True:
i = haystack.find(needle, i)
if i < 0:
break
yield i
i += len(needle)
def _fixmonths(months):
yield from months
# The lower case of 'İ' ('\u0130') is 'i\u0307'.
# The re module only supports 1-to-1 character matching in
# case-insensitive mode.
for s in months:
if 'i\u0307' in s:
yield s.replace('i\u0307', '\u0130')
lzh_TW_alt_digits = (
# 〇:一:二:三:四:五:六:七:八:九
'\u3007', '\u4e00', '\u4e8c', '\u4e09', '\u56db',
'\u4e94', '\u516d', '\u4e03', '\u516b', '\u4e5d',
# 十:十一:十二:十三:十四:十五:十六:十七:十八:十九
'\u5341', '\u5341\u4e00', '\u5341\u4e8c', '\u5341\u4e09', '\u5341\u56db',
'\u5341\u4e94', '\u5341\u516d', '\u5341\u4e03', '\u5341\u516b', '\u5341\u4e5d',
# 廿:廿一:廿二:廿三:廿四:廿五:廿六:廿七:廿八:廿九
'\u5eff', '\u5eff\u4e00', '\u5eff\u4e8c', '\u5eff\u4e09', '\u5eff\u56db',
'\u5eff\u4e94', '\u5eff\u516d', '\u5eff\u4e03', '\u5eff\u516b', '\u5eff\u4e5d',
# 卅:卅一
'\u5345', '\u5345\u4e00')
class LocaleTime(object):
"""Stores and handles locale-specific information related to time.
ATTRIBUTES:
f_weekday -- full weekday names (7-item list)
a_weekday -- abbreviated weekday names (7-item list)
f_month -- full month names (13-item list; dummy value in [0], which
is added by code)
a_month -- abbreviated month names (13-item list, dummy value in
[0], which is added by code)
am_pm -- AM/PM representation (2-item list)
LC_date_time -- format string for date/time representation (string)
LC_date -- format string for date representation (string)
LC_time -- format string for time representation (string)
timezone -- daylight- and non-daylight-savings timezone representation
(2-item list of sets)
lang -- Language used by instance (2-item tuple)
"""
def __init__(self):
"""Set all attributes.
Order of methods called matters for dependency reasons.
The locale language is set at the offset and then checked again before
exiting. This is to make sure that the attributes were not set with a
mix of information from more than one locale. This would most likely
happen when using threads where one thread calls a locale-dependent
function while another thread changes the locale while the function in
the other thread is still running. Proper coding would call for
locks to prevent changing the locale while locale-dependent code is
running. The check here is done in case someone does not think about
doing this.
Only other possible issue is if someone changed the timezone and did
not call tz.tzset . That is an issue for the programmer, though,
since changing the timezone is worthless without that call.
"""
self.lang = _getlang()
self.__calc_weekday()
self.__calc_month()
self.__calc_am_pm()
self.__calc_alt_digits()
self.__calc_timezone()
self.__calc_date_time()
if _getlang() != self.lang:
raise ValueError("locale changed during initialization")
if time.tzname != self.tzname or time.daylight != self.daylight:
raise ValueError("timezone changed during initialization")
def __calc_weekday(self):
# Set self.a_weekday and self.f_weekday using the calendar
# module.
a_weekday = [calendar.day_abbr[i].lower() for i in range(7)]
f_weekday = [calendar.day_name[i].lower() for i in range(7)]
self.a_weekday = a_weekday
self.f_weekday = f_weekday
def __calc_month(self):
# Set self.f_month and self.a_month using the calendar module.
a_month = [calendar.month_abbr[i].lower() for i in range(13)]
f_month = [calendar.month_name[i].lower() for i in range(13)]
self.a_month = a_month
self.f_month = f_month
def __calc_am_pm(self):
# Set self.am_pm by using time.strftime().
# The magic date (1999,3,17,hour,44,55,2,76,0) is not really that
# magical; just happened to have used it everywhere else where a
# static date was needed.
am_pm = []
for hour in (1, 22):
time_tuple = time.struct_time((1999,3,17,hour,44,55,2,76,0))
# br_FR has AM/PM info (' ',' ').
am_pm.append(time.strftime("%p", time_tuple).lower().strip())
self.am_pm = am_pm
def __calc_alt_digits(self):
# Set self.LC_alt_digits by using time.strftime().
# The magic data should contain all decimal digits.
time_tuple = time.struct_time((1998, 1, 27, 10, 43, 56, 1, 27, 0))
s = time.strftime("%x%X", time_tuple)
if s.isascii():
# Fast path -- all digits are ASCII.
self.LC_alt_digits = ()
return
digits = ''.join(sorted(set(re.findall(r'\d', s))))
if len(digits) == 10 and ord(digits[-1]) == ord(digits[0]) + 9:
# All 10 decimal digits from the same set.
if digits.isascii():
# All digits are ASCII.
self.LC_alt_digits = ()
return
self.LC_alt_digits = [a + b for a in digits for b in digits]
# Test whether the numbers contain leading zero.
time_tuple2 = time.struct_time((2000, 1, 1, 1, 1, 1, 5, 1, 0))
if self.LC_alt_digits[1] not in time.strftime("%x %X", time_tuple2):
self.LC_alt_digits[:10] = digits
return
# Either non-Gregorian calendar or non-decimal numbers.
if {'\u4e00', '\u4e03', '\u4e5d', '\u5341', '\u5eff'}.issubset(s):
# lzh_TW
self.LC_alt_digits = lzh_TW_alt_digits
return
self.LC_alt_digits = None
def __calc_date_time(self):
# Set self.LC_date_time, self.LC_date, self.LC_time and
# self.LC_time_ampm by using time.strftime().
# Use (1999,3,17,22,44,55,2,76,0) for magic date because the amount of
# overloaded numbers is minimized. The order in which searches for
# values within the format string is very important; it eliminates
# possible ambiguity for what something represents.
time_tuple = time.struct_time((1999,3,17,22,44,55,2,76,0))
time_tuple2 = time.struct_time((1999,1,3,1,1,1,6,3,0))
replacement_pairs = []
# Non-ASCII digits
if self.LC_alt_digits or self.LC_alt_digits is None:
for n, d in [(19, '%OC'), (99, '%Oy'), (22, '%OH'),
(44, '%OM'), (55, '%OS'), (17, '%Od'),
(3, '%Om'), (2, '%Ow'), (10, '%OI')]:
if self.LC_alt_digits is None:
s = chr(0x660 + n // 10) + chr(0x660 + n % 10)
replacement_pairs.append((s, d))
if n < 10:
replacement_pairs.append((s[1], d))
elif len(self.LC_alt_digits) > n:
replacement_pairs.append((self.LC_alt_digits[n], d))
else:
replacement_pairs.append((time.strftime(d, time_tuple), d))
replacement_pairs += [
('1999', '%Y'), ('99', '%y'), ('22', '%H'),
('44', '%M'), ('55', '%S'), ('76', '%j'),
('17', '%d'), ('03', '%m'), ('3', '%m'),
# '3' needed for when no leading zero.
('2', '%w'), ('10', '%I'),
]
date_time = []
for directive in ('%c', '%x', '%X', '%r'):
current_format = time.strftime(directive, time_tuple).lower()
current_format = current_format.replace('%', '%%')
# The month and the day of the week formats are treated specially
# because of a possible ambiguity in some locales where the full
# and abbreviated names are equal or names of different types
# are equal. See doc of __find_month_format for more details.
lst, fmt = self.__find_weekday_format(directive)
if lst:
current_format = current_format.replace(lst[2], fmt, 1)
lst, fmt = self.__find_month_format(directive)
if lst:
current_format = current_format.replace(lst[3], fmt, 1)
if self.am_pm[1]:
# Must deal with possible lack of locale info
# manifesting itself as the empty string (e.g., Swedish's
# lack of AM/PM info) or a platform returning a tuple of empty
# strings (e.g., MacOS 9 having timezone as ('','')).
current_format = current_format.replace(self.am_pm[1], '%p')
for tz_values in self.timezone:
for tz in tz_values:
if tz:
current_format = current_format.replace(tz, "%Z")
# Transform all non-ASCII digits to digits in range U+0660 to U+0669.
if not current_format.isascii() and self.LC_alt_digits is None:
current_format = re_sub(r'[\d--0-9]',
lambda m: chr(0x0660 + int(m[0])),
current_format)
for old, new in replacement_pairs:
current_format = current_format.replace(old, new)
# If %W is used, then Sunday, 2005-01-03 will fall on week 0 since
# 2005-01-03 occurs before the first Monday of the year. Otherwise
# %U is used.
if '00' in time.strftime(directive, time_tuple2):
U_W = '%W'
else:
U_W = '%U'
current_format = current_format.replace('11', U_W)
date_time.append(current_format)
self.LC_date_time = date_time[0]
self.LC_date = date_time[1]
self.LC_time = date_time[2]
self.LC_time_ampm = date_time[3]
def __find_month_format(self, directive):
"""Find the month format appropriate for the current locale.
In some locales (for example French and Hebrew), the default month
used in __calc_date_time has the same name in full and abbreviated
form. Also, the month name can by accident match other part of the
representation: the day of the week name (for example in Morisyen)
or the month number (for example in Japanese). Thus, cycle months
of the year and find all positions that match the month name for
each month, If no common positions are found, the representation
does not use the month name.
"""
full_indices = abbr_indices = None
for m in range(1, 13):
time_tuple = time.struct_time((1999, m, 17, 22, 44, 55, 2, 76, 0))
datetime = time.strftime(directive, time_tuple).lower()
indices = set(_findall(datetime, self.f_month[m]))
if full_indices is None:
full_indices = indices
else:
full_indices &= indices
indices = set(_findall(datetime, self.a_month[m]))
if abbr_indices is None:
abbr_indices = set(indices)
else:
abbr_indices &= indices
if not full_indices and not abbr_indices:
return None, None
if full_indices:
return self.f_month, '%B'
if abbr_indices:
return self.a_month, '%b'
return None, None
def __find_weekday_format(self, directive):
"""Find the day of the week format appropriate for the current locale.
Similar to __find_month_format().
"""
full_indices = abbr_indices = None
for wd in range(7):
time_tuple = time.struct_time((1999, 3, 17, 22, 44, 55, wd, 76, 0))
datetime = time.strftime(directive, time_tuple).lower()
indices = set(_findall(datetime, self.f_weekday[wd]))
if full_indices is None:
full_indices = indices
else:
full_indices &= indices
if self.f_weekday[wd] != self.a_weekday[wd]:
indices = set(_findall(datetime, self.a_weekday[wd]))
if abbr_indices is None:
abbr_indices = set(indices)
else:
abbr_indices &= indices
if not full_indices and not abbr_indices:
return None, None
if full_indices:
return self.f_weekday, '%A'
if abbr_indices:
return self.a_weekday, '%a'
return None, None
def __calc_timezone(self):
# Set self.timezone by using time.tzname.
# Do not worry about possibility of time.tzname[0] == time.tzname[1]
# and time.daylight; handle that in strptime.
try:
time.tzset()
except AttributeError:
pass
self.tzname = time.tzname
self.daylight = time.daylight
no_saving = frozenset({"utc", "gmt", self.tzname[0].lower()})
if self.daylight:
has_saving = frozenset({self.tzname[1].lower()})
else:
has_saving = frozenset()
self.timezone = (no_saving, has_saving)
class TimeRE(dict):
"""Handle conversion from format directives to regexes."""
def __init__(self, locale_time=None):
"""Create keys/values.
Order of execution is important for dependency reasons.
"""
if locale_time:
self.locale_time = locale_time
else:
self.locale_time = LocaleTime()
base = super()
mapping = {
# The " [1-9]" part of the regex is to make %c from ANSI C work
'd': r"(?P<d>3[0-1]|[1-2]\d|0[1-9]|[1-9]| [1-9])",
'f': r"(?P<f>[0-9]{1,6})",
'H': r"(?P<H>2[0-3]|[0-1]\d|\d| \d)",
'k': r"(?P<H>2[0-3]|[0-1]\d|\d| \d)",
'I': r"(?P<I>1[0-2]|0[1-9]|[1-9]| [1-9])",
'l': r"(?P<I>1[0-2]|0[1-9]|[1-9]| [1-9])",
'G': r"(?P<G>\d\d\d\d)",
'j': r"(?P<j>36[0-6]|3[0-5]\d|[1-2]\d\d|0[1-9]\d|00[1-9]|[1-9]\d|0[1-9]|[1-9])",
'm': r"(?P<m>1[0-2]|0[1-9]|[1-9])",
'M': r"(?P<M>[0-5]\d|\d)",
'S': r"(?P<S>6[0-1]|[0-5]\d|\d)",
'U': r"(?P<U>5[0-3]|[0-4]\d|\d)",
'w': r"(?P<w>[0-6])",
'u': r"(?P<u>[1-7])",
'V': r"(?P<V>5[0-3]|0[1-9]|[1-4]\d|\d)",
# W is set below by using 'U'
'y': r"(?P<y>\d\d)",
'Y': r"(?P<Y>\d\d\d\d)",
# See gh-121237: "z" must support colons for backwards compatibility.
'z': r"(?P<z>([+-]\d\d:?[0-5]\d(:?[0-5]\d(\.\d{1,6})?)?)|(?-i:Z))?",
':z': r"(?P<colon_z>([+-]\d\d:[0-5]\d(:[0-5]\d(\.\d{1,6})?)?)|(?-i:Z))?",
'A': self.__seqToRE(self.locale_time.f_weekday, 'A'),
'a': self.__seqToRE(self.locale_time.a_weekday, 'a'),
'B': self.__seqToRE(_fixmonths(self.locale_time.f_month[1:]), 'B'),
'b': self.__seqToRE(_fixmonths(self.locale_time.a_month[1:]), 'b'),
'p': self.__seqToRE(self.locale_time.am_pm, 'p'),
'Z': self.__seqToRE((tz for tz_names in self.locale_time.timezone
for tz in tz_names),
'Z'),
'n': r'\s*',
't': r'\s*',
'%': '%',
}
for n in range(1, 7):
mapping[f'{n}f'] = rf"(?P<f>[0-9]{{{n}}})"
if self.locale_time.LC_alt_digits is None:
for d in 'dmyCHIMS':
mapping['O' + d] = r'(?P<%s>\d\d|\d| \d)' % d
mapping['Ow'] = r'(?P<w>\d)'
else:
mapping.update({
'Od': self.__seqToRE(self.locale_time.LC_alt_digits[1:32], 'd',
'3[0-1]|[1-2][0-9]|0[1-9]|[1-9]'),
'Om': self.__seqToRE(self.locale_time.LC_alt_digits[1:13], 'm',
'1[0-2]|0[1-9]|[1-9]'),
'Ow': self.__seqToRE(self.locale_time.LC_alt_digits[:7], 'w',
'[0-6]'),
'Oy': self.__seqToRE(self.locale_time.LC_alt_digits, 'y',
'[0-9][0-9]'),
'OC': self.__seqToRE(self.locale_time.LC_alt_digits, 'C',
'[0-9][0-9]'),
'OH': self.__seqToRE(self.locale_time.LC_alt_digits[:24], 'H',
'2[0-3]|[0-1][0-9]|[0-9]'),
'OI': self.__seqToRE(self.locale_time.LC_alt_digits[1:13], 'I',
'1[0-2]|0[1-9]|[1-9]'),
'OM': self.__seqToRE(self.locale_time.LC_alt_digits[:60], 'M',
'[0-5][0-9]|[0-9]'),
'OS': self.__seqToRE(self.locale_time.LC_alt_digits[:62], 'S',
'6[0-1]|[0-5][0-9]|[0-9]'),
})
mapping.update({
'e': mapping['d'],
'Oe': mapping['Od'],
'P': mapping['p'],
'Op': mapping['p'],
'W': mapping['U'].replace('U', 'W'),
})
mapping['W'] = mapping['U'].replace('U', 'W')
base.__init__(mapping)
base.__setitem__('D', self.pattern('%m/%d/%y'))
base.__setitem__('F', self.pattern('%Y-%m-%d'))
base.__setitem__('T', self.pattern('%H:%M:%S'))
base.__setitem__('R', self.pattern('%H:%M'))
base.__setitem__('r', self.pattern(self.locale_time.LC_time_ampm))
base.__setitem__('X', self.pattern(self.locale_time.LC_time))
base.__setitem__('x', self.pattern(self.locale_time.LC_date))
base.__setitem__('c', self.pattern(self.locale_time.LC_date_time))
def __seqToRE(self, to_convert, directive, altregex=None):
"""Convert a list to a regex string for matching a directive.
Want possible matching values to be from longest to shortest. This
prevents the possibility of a match occurring for a value that also
a substring of a larger value that should have matched (e.g., 'abc'
matching when 'abcdef' should have been the match).
"""
to_convert = sorted(to_convert, key=len, reverse=True)
for value in to_convert:
if value != '':
break
else:
return ''
regex = '|'.join(re_escape(stuff) for stuff in to_convert)
if altregex is not None:
regex += '|' + altregex
return '(?P<%s>%s)' % (directive, regex)
def pattern(self, format):
"""Return regex pattern for the format string.
Need to make sure that any characters that might be interpreted as
regex syntax are escaped.
"""
# The sub() call escapes all characters that might be misconstrued
# as regex syntax. Cannot use re.escape since we have to deal with
# format directives (%m, etc.).
format = re_sub(r"([\\.^$*+?\(\){}\[\]|])", r"\\\1", format)
format = re_sub(r'\s+', r'\\s+', format)
format = re_sub(r"'", "['\u02bc]", format) # needed for br_FR
year_in_format = False
day_d_in_format = False
day_e_in_format = False
def repl(m):
directive = m.group()[1:] # exclude `%` symbol
match directive:
case 'Y' | 'y' | 'G':
nonlocal year_in_format
year_in_format = True
case 'd':
nonlocal day_d_in_format
day_d_in_format = True
case 'e':
nonlocal day_e_in_format
day_e_in_format = True
return self[directive]
format = re_sub(r'%[-_0^#]*[0-9]*([OE]?[:\\]?.?)', repl, format)
if not year_in_format:
if day_d_in_format:
raise ValueError(
"Day of month directive '%d' may not be used without "
"a year directive. Parsing dates involving a day of "
"month without a year is ambiguous and fails to parse "
"leap day. Add a year to the input and format. "
"See https://github.com/python/cpython/issues/70647.")
if day_e_in_format:
import warnings
warnings.warn("""\
Parsing dates involving a day of month without a year specified is ambiguous
and fails to parse leap day. '%e' without a year will become an error in Python 3.17.
To avoid trouble, add a specific year to the input and format.
See https://github.com/python/cpython/issues/70647.""",
DeprecationWarning,
skip_file_prefixes=(os.path.dirname(__file__),))
return format
def compile(self, format):
"""Return a compiled re object for the format string."""
return re_compile(self.pattern(format), IGNORECASE)
_cache_lock = _thread_allocate_lock()
# DO NOT modify _TimeRE_cache or _regex_cache without acquiring the cache lock
# first!
_TimeRE_cache = TimeRE()
_CACHE_MAX_SIZE = 5 # Max number of regexes stored in _regex_cache
_regex_cache = {}
def _calc_julian_from_U_or_W(year, week_of_year, day_of_week, week_starts_Mon):
"""Calculate the Julian day based on the year, week of the year, and day of
the week, with week_start_day representing whether the week of the year
assumes the week starts on Sunday or Monday (6 or 0)."""
first_weekday = datetime_date(year, 1, 1).weekday()
# If we are dealing with the %U directive (week starts on Sunday), it's
# easier to just shift the view to Sunday being the first day of the
# week.
if not week_starts_Mon:
first_weekday = (first_weekday + 1) % 7
day_of_week = (day_of_week + 1) % 7
# Need to watch out for a week 0 (when the first day of the year is not
# the same as that specified by %U or %W).
week_0_length = (7 - first_weekday) % 7
if week_of_year == 0:
return 1 + day_of_week - first_weekday
else:
days_to_week = week_0_length + (7 * (week_of_year - 1))
return 1 + days_to_week + day_of_week
def _strptime(data_string, format="%a %b %d %H:%M:%S %Y"):
"""Return a 3-tuple consisting of a tuple with time components,
an int containing the number of microseconds, and an int
containing the microseconds part of the GMT offset, based on the
input string and the format string."""
for index, arg in enumerate([data_string, format]):
if not isinstance(arg, str):
msg = "strptime() argument {} must be str, not {}"
raise TypeError(msg.format(index, type(arg)))
global _TimeRE_cache, _regex_cache
with _cache_lock:
locale_time = _TimeRE_cache.locale_time
if (_getlang() != locale_time.lang or
time.tzname != locale_time.tzname or
time.daylight != locale_time.daylight):
_TimeRE_cache = TimeRE()
_regex_cache.clear()
locale_time = _TimeRE_cache.locale_time
if len(_regex_cache) > _CACHE_MAX_SIZE:
_regex_cache.clear()
format_regex = _regex_cache.get(format)
if not format_regex:
try:
format_regex = _TimeRE_cache.compile(format)
# KeyError raised when a bad format is found; can be specified as
# \\, in which case it was a stray % but with a space after it
except KeyError as err:
bad_directive = err.args[0]
del err
bad_directive = bad_directive.replace('\\s', '')
if not bad_directive:
raise ValueError(f"stray % in format {format!r}") from None
bad_directive = bad_directive.replace('\\', '', 1)
raise ValueError(f"{bad_directive!r} is a bad directive "
f"in format {format!r}") from None
_regex_cache[format] = format_regex
found = format_regex.match(data_string)
if not found:
raise ValueError(f"time data {data_string!r} does not match "
f"format {format!r}")
if len(data_string) != found.end():
rest = data_string[found.end():]
# Specific check for '%:z' directive
if (
"colon_z" in found.re.groupindex
and found.group("colon_z") is not None
and rest[0] != ":"
):
raise ValueError(
f"Missing colon in %:z before {rest!r}, got {data_string!r}"
)
raise ValueError(f"unconverted data remains: {rest!r}")
iso_year = year = None
month = day = 1
hour = minute = second = fraction = 0
tz = -1
gmtoff = None
gmtoff_fraction = 0
iso_week = week_of_year = None
week_of_year_start = None
# weekday and julian defaulted to None so as to signal need to calculate
# values
weekday = julian = None
found_dict = found.groupdict()
if locale_time.LC_alt_digits:
def parse_int(s):
try:
return locale_time.LC_alt_digits.index(s)
except ValueError:
return int(s)
else:
parse_int = int
for group_key in found_dict.keys():
# Directives not explicitly handled below:
# c, x, X
# handled by making out of other directives
# U, W
# worthless without day of the week
if group_key == 'y':
year = parse_int(found_dict['y'])
if 'C' in found_dict:
century = parse_int(found_dict['C'])
year += century * 100
else:
# Open Group specification for strptime() states that a %y
#value in the range of [00, 68] is in the century 2000, while
#[69,99] is in the century 1900
if year <= 68:
year += 2000
else:
year += 1900
elif group_key == 'Y':
year = int(found_dict['Y'])
elif group_key == 'G':
iso_year = int(found_dict['G'])
elif group_key == 'm':
month = parse_int(found_dict['m'])
elif group_key == 'B':
month = locale_time.f_month.index(found_dict['B'].lower())
elif group_key == 'b':
month = locale_time.a_month.index(found_dict['b'].lower())
elif group_key == 'd':
day = parse_int(found_dict['d'])
elif group_key == 'H':
hour = parse_int(found_dict['H'])
elif group_key == 'I':
hour = parse_int(found_dict['I'])
ampm = found_dict.get('p', '').lower()
# If there was no AM/PM indicator, we'll treat this like AM
if ampm == locale_time.am_pm[1]:
# We're in PM so we need to add 12 to the hour unless
# we're looking at 12 noon.
# 12 noon == 12 PM == hour 12
if hour != 12:
hour += 12
else:
# We're in AM so the hour is correct unless we're
# looking at 12 midnight.
# 12 midnight == 12 AM == hour 0
if hour == 12:
hour = 0
elif group_key == 'M':
minute = parse_int(found_dict['M'])
elif group_key == 'S':
second = parse_int(found_dict['S'])
elif group_key == 'f':
s = found_dict['f']
# Pad to always return microseconds.
s += "0" * (6 - len(s))
fraction = int(s)
elif group_key == 'A':
weekday = locale_time.f_weekday.index(found_dict['A'].lower())
elif group_key == 'a':
weekday = locale_time.a_weekday.index(found_dict['a'].lower())
elif group_key == 'w':
weekday = int(found_dict['w'])
if weekday == 0:
weekday = 6
else:
weekday -= 1
elif group_key == 'u':
weekday = int(found_dict['u'])
weekday -= 1
elif group_key == 'j':
julian = int(found_dict['j'])
elif group_key in ('U', 'W'):
week_of_year = int(found_dict[group_key])
if group_key == 'U':
# U starts week on Sunday.
week_of_year_start = 6
else:
# W starts week on Monday.
week_of_year_start = 0
elif group_key == 'V':
iso_week = int(found_dict['V'])
elif group_key in ('z', 'colon_z'):
z = found_dict[group_key]
if z:
if z == 'Z':
gmtoff = 0
else:
if z[3] == ':':
z = z[:3] + z[4:]
if len(z) > 5:
if z[5] != ':':
msg = f"Inconsistent use of : in {found_dict[group_key]!r}"
raise ValueError(msg)
z = z[:5] + z[6:]
hours = int(z[1:3])
minutes = int(z[3:5])
seconds = int(z[5:7] or 0)
gmtoff = (hours * 60 * 60) + (minutes * 60) + seconds
gmtoff_remainder = z[8:]
# Pad to always return microseconds.
gmtoff_remainder_padding = "0" * (6 - len(gmtoff_remainder))
gmtoff_fraction = int(gmtoff_remainder + gmtoff_remainder_padding)
if z.startswith("-"):
gmtoff = -gmtoff
gmtoff_fraction = -gmtoff_fraction
elif group_key == 'Z':
# Since -1 is default value only need to worry about setting tz if
# it can be something other than -1.
found_zone = found_dict['Z'].lower()
for value, tz_values in enumerate(locale_time.timezone):
if found_zone in tz_values:
# Deal with bad locale setup where timezone names are the
# same and yet time.daylight is true; too ambiguous to
# be able to tell what timezone has daylight savings
if (time.tzname[0] == time.tzname[1] and
time.daylight and found_zone not in ("utc", "gmt")):
break
else:
tz = value
break
# Deal with the cases where ambiguities arise
# don't assume default values for ISO week/year
if iso_year is not None:
if julian is not None:
raise ValueError("Day of the year directive '%j' is not "
"compatible with ISO year directive '%G'. "
"Use '%Y' instead.")
elif iso_week is None or weekday is None:
raise ValueError("ISO year directive '%G' must be used with "
"the ISO week directive '%V' and a weekday "
"directive ('%A', '%a', '%w', or '%u').")
elif iso_week is not None:
if year is None or weekday is None:
raise ValueError("ISO week directive '%V' must be used with "
"the ISO year directive '%G' and a weekday "
"directive ('%A', '%a', '%w', or '%u').")
else:
raise ValueError("ISO week directive '%V' is incompatible with "
"the year directive '%Y'. Use the ISO year '%G' "
"instead.")
leap_year_fix = False
if year is None:
if month == 2 and day == 29:
year = 1904 # 1904 is first leap year of 20th century
leap_year_fix = True
else:
year = 1900
# If we know the week of the year and what day of that week, we can figure
# out the Julian day of the year.
if julian is None and weekday is not None:
if week_of_year is not None:
week_starts_Mon = True if week_of_year_start == 0 else False
julian = _calc_julian_from_U_or_W(year, week_of_year, weekday,
week_starts_Mon)
elif iso_year is not None and iso_week is not None:
datetime_result = datetime_date.fromisocalendar(iso_year, iso_week, weekday + 1)
year = datetime_result.year
month = datetime_result.month
day = datetime_result.day
if julian is not None and julian <= 0:
year -= 1
yday = 366 if calendar.isleap(year) else 365
julian += yday
if julian is None:
# Cannot pre-calculate datetime_date() since can change in Julian
# calculation and thus could have different value for the day of
# the week calculation.
# Need to add 1 to result since first day of the year is 1, not 0.
julian = datetime_date(year, month, day).toordinal() - \
datetime_date(year, 1, 1).toordinal() + 1
else: # Assume that if they bothered to include Julian day (or if it was
# calculated above with year/week/weekday) it will be accurate.
datetime_result = datetime_date.fromordinal(
(julian - 1) +
datetime_date(year, 1, 1).toordinal())
year = datetime_result.year
month = datetime_result.month
day = datetime_result.day
if weekday is None:
weekday = datetime_date(year, month, day).weekday()
# Add timezone info
tzname = found_dict.get("Z")
if leap_year_fix:
# the caller didn't supply a year but asked for Feb 29th. We couldn't
# use the default of 1900 for computations. We set it back to ensure
# that February 29th is smaller than March 1st.
year = 1900
return (year, month, day,
hour, minute, second,
weekday, julian, tz, tzname, gmtoff), fraction, gmtoff_fraction
def _strptime_time(data_string, format="%a %b %d %H:%M:%S %Y"):
"""Return a time struct based on the input string and the
format string."""
tt = _strptime(data_string, format)[0]
return time.struct_time(tt[:time._STRUCT_TM_ITEMS])
def _strptime_datetime_date(cls, data_string, format="%a %b %d %Y"):
"""Return a date instance based on the input string and the
format string."""
tt, _, _ = _strptime(data_string, format)
args = tt[:3]
return cls(*args)
def _parse_tz(tzname, gmtoff, gmtoff_fraction):
tzdelta = datetime_timedelta(seconds=gmtoff, microseconds=gmtoff_fraction)
if tzname:
return datetime_timezone(tzdelta, tzname)
else:
return datetime_timezone(tzdelta)
def _strptime_datetime_time(cls, data_string, format="%H:%M:%S"):
"""Return a time instance based on the input string and the
format string."""
tt, fraction, gmtoff_fraction = _strptime(data_string, format)
tzname, gmtoff = tt[-2:]
args = tt[3:6] + (fraction,)
if gmtoff is None:
return cls(*args)
else:
tz = _parse_tz(tzname, gmtoff, gmtoff_fraction)
return cls(*args, tz)
def _strptime_datetime_datetime(cls, data_string, format="%a %b %d %H:%M:%S %Y"):
"""Return a datetime instance based on the input string and the
format string."""
tt, fraction, gmtoff_fraction = _strptime(data_string, format)
tzname, gmtoff = tt[-2:]
args = tt[:6] + (fraction,)
if gmtoff is None:
return cls(*args)
else:
tz = _parse_tz(tzname, gmtoff, gmtoff_fraction)
return cls(*args, tz)