forked from gunthercox/ChatterBot
-
Notifications
You must be signed in to change notification settings - Fork 0
/
parsing.py
746 lines (710 loc) · 22.6 KB
/
parsing.py
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
import re
from datetime import timedelta, datetime
import calendar
# Variations of dates that the parser can capture
year_variations = ['year', 'years', 'yrs']
day_variations = ['days', 'day']
minute_variations = ['minute', 'minutes', 'mins']
hour_variations = ['hrs', 'hours', 'hour']
week_variations = ['weeks', 'week', 'wks']
month_variations = ['month', 'months']
# Variables used for RegEx Matching
day_names = 'monday|tuesday|wednesday|thursday|friday|saturday|sunday'
month_names_long = (
'january|february|march|april|may|june|july|august|september|october|november|december'
)
month_names = month_names_long + '|jan|feb|mar|apr|may|jun|jul|aug|sep|oct|nov|dec'
day_nearest_names = 'today|yesterday|tomorrow|tonight|tonite'
numbers = (
r'(^a(?=\s)|one|two|three|four|five|six|seven|eight|nine|ten|'
r'eleven|twelve|thirteen|fourteen|fifteen|sixteen|seventeen|'
r'eighteen|nineteen|twenty|thirty|forty|fifty|sixty|seventy|'
r'eighty|ninety|hundred|thousand)'
)
re_dmy = '(' + '|'.join(day_variations + minute_variations + year_variations + week_variations + month_variations) + ')'
re_duration = r'(before|after|earlier|later|ago|from\snow)'
re_year = r'(19|20)\d{2}|^(19|20)\d{2}'
re_timeframe = r'this|coming|next|following|previous|last|end\sof\sthe'
re_ordinal = r'st|nd|rd|th|first|second|third|fourth|fourth|' + re_timeframe
re_time = r'(?P<hour>\d{1,2})(\:(?P<minute>\d{1,2})(\sam|pm)?|\s?(?P<convention>am|pm))'
re_separator = r'of|at|on'
NUMBERS = {
'zero': 0,
'one': 1,
'two': 2,
'three': 3,
'four': 4,
'five': 5,
'six': 6,
'seven': 7,
'eight': 8,
'nine': 9,
'ten': 10,
'eleven': 11,
'twelve': 12,
'thirteen': 13,
'fourteen': 14,
'fifteen': 15,
'sixteen': 16,
'seventeen': 17,
'eighteen': 18,
'nineteen': 19,
'twenty': 20,
'thirty': 30,
'forty': 40,
'fifty': 50,
'sixty': 60,
'seventy': 70,
'eighty': 80,
'ninety': 90,
'hundred': 100,
'thousand': 1000,
'million': 1000000,
'billion': 1000000000,
'trillion': 1000000000000,
}
# Mapping of Month name and Value
HASHMONTHS = {
'january': 1,
'jan': 1,
'february': 2,
'feb': 2,
'march': 3,
'mar': 3,
'april': 4,
'apr': 4,
'may': 5,
'june': 6,
'jun': 6,
'july': 7,
'jul': 7,
'august': 8,
'aug': 8,
'september': 9,
'sep': 9,
'october': 10,
'oct': 10,
'november': 11,
'nov': 11,
'december': 12,
'dec': 12
}
# Days to number mapping
HASHWEEKDAYS = {
'monday': 0,
'mon': 0,
'tuesday': 1,
'tue': 1,
'wednesday': 2,
'wed': 2,
'thursday': 3,
'thu': 3,
'friday': 4,
'fri': 4,
'saturday': 5,
'sat': 5,
'sunday': 6,
'sun': 6
}
# Ordinal to number
HASHORDINALS = {
'zeroth': 0,
'first': 1,
'second': 2,
'third': 3,
'fourth': 4,
'forth': 4,
'fifth': 5,
'sixth': 6,
'seventh': 7,
'eighth': 8,
'ninth': 9,
'tenth': 10,
'eleventh': 11,
'twelfth': 12,
'thirteenth': 13,
'fourteenth': 14,
'fifteenth': 15,
'sixteenth': 16,
'seventeenth': 17,
'eighteenth': 18,
'nineteenth': 19,
'twentieth': 20,
'last': -1
}
# A list tuple of regular expressions / parser fn to match
# Start with the widest match and narrow it down because the order of the match in this list matters
regex = [
(
re.compile(
r'''
(
((?P<dow>%s)[,\s]\s*)? #Matches Monday, 12 Jan 2012, 12 Jan 2012 etc
(?P<day>\d{1,2}) # Matches a digit
(%s)?
[-\s] # One or more space
(?P<month>%s) # Matches any month name
[-\s] # Space
(?P<year>%s) # Year
((\s|,\s|\s(%s))?\s*(%s))?
)
''' % (day_names, re_ordinal, month_names, re_year, re_separator, re_time),
(re.VERBOSE | re.IGNORECASE)
),
lambda m, base_date: datetime(
int(m.group('year') if m.group('year') else base_date.year),
HASHMONTHS[m.group('month').strip().lower()],
int(m.group('day') if m.group('day') else 1),
) + timedelta(**convert_time_to_hour_minute(
m.group('hour'),
m.group('minute'),
m.group('convention')
))
),
(
re.compile(
r'''
(
((?P<dow>%s)[,\s][-\s]*)? #Matches Monday, Jan 12 2012, Jan 12 2012 etc
(?P<month>%s) # Matches any month name
[-\s] # Space
((?P<day>\d{1,2})) # Matches a digit
(%s)?
([-\s](?P<year>%s))? # Year
((\s|,\s|\s(%s))?\s*(%s))?
)
''' % (day_names, month_names, re_ordinal, re_year, re_separator, re_time),
(re.VERBOSE | re.IGNORECASE)
),
lambda m, base_date: datetime(
int(m.group('year') if m.group('year') else base_date.year),
HASHMONTHS[m.group('month').strip().lower()],
int(m.group('day') if m.group('day') else 1)
) + timedelta(**convert_time_to_hour_minute(
m.group('hour'),
m.group('minute'),
m.group('convention')
))
),
(
re.compile(
r'''
(
(?P<month>%s) # Matches any month name
[-\s] # One or more space
(?P<day>\d{1,2}) # Matches a digit
(%s)?
[-\s]\s*?
(?P<year>%s) # Year
((\s|,\s|\s(%s))?\s*(%s))?
)
''' % (month_names, re_ordinal, re_year, re_separator, re_time),
(re.VERBOSE | re.IGNORECASE)
),
lambda m, base_date: datetime(
int(m.group('year') if m.group('year') else base_date.year),
HASHMONTHS[m.group('month').strip().lower()],
int(m.group('day') if m.group('day') else 1),
) + timedelta(**convert_time_to_hour_minute(
m.group('hour'),
m.group('minute'),
m.group('convention')
))
),
(
re.compile(
r'''
(
((?P<number>\d+|(%s[-\s]?)+)\s)? # Matches any number or string 25 or twenty five
(?P<unit>%s)s?\s # Matches days, months, years, weeks, minutes
(?P<duration>%s) # before, after, earlier, later, ago, from now
(\s*(?P<base_time>(%s)))?
((\s|,\s|\s(%s))?\s*(%s))?
)
''' % (numbers, re_dmy, re_duration, day_nearest_names, re_separator, re_time),
(re.VERBOSE | re.IGNORECASE)
),
lambda m, base_date: date_from_duration(
base_date,
m.group('number'),
m.group('unit').lower(),
m.group('duration').lower(),
m.group('base_time')
) + timedelta(**convert_time_to_hour_minute(
m.group('hour'),
m.group('minute'),
m.group('convention')
))
),
(
re.compile(
r'''
(
(?P<ordinal>%s) # First quarter of 2014
\s+
quarter\sof
\s+
(?P<year>%s)
)
''' % (re_ordinal, re_year),
(re.VERBOSE | re.IGNORECASE)
),
lambda m, base_date: date_from_quarter(
base_date,
HASHORDINALS[m.group('ordinal').lower()],
int(m.group('year') if m.group('year') else base_date.year)
)
),
(
re.compile(
r'''
(
(?P<ordinal_value>\d+)
(?P<ordinal>%s) # 1st January 2012
((\s|,\s|\s(%s))?\s*)?
(?P<month>%s)
([,\s]\s*(?P<year>%s))?
)
''' % (re_ordinal, re_separator, month_names, re_year),
(re.VERBOSE | re.IGNORECASE)
),
lambda m, base_date: datetime(
int(m.group('year') if m.group('year') else base_date.year),
int(HASHMONTHS[m.group('month').lower()] if m.group('month') else 1),
int(m.group('ordinal_value') if m.group('ordinal_value') else 1),
)
),
(
re.compile(
r'''
(
(?P<month>%s)
\s+
(?P<ordinal_value>\d+)
(?P<ordinal>%s) # January 1st 2012
([,\s]\s*(?P<year>%s))?
)
''' % (month_names, re_ordinal, re_year),
(re.VERBOSE | re.IGNORECASE)
),
lambda m, base_date: datetime(
int(m.group('year') if m.group('year') else base_date.year),
int(HASHMONTHS[m.group('month').lower()] if m.group('month') else 1),
int(m.group('ordinal_value') if m.group('ordinal_value') else 1),
)
),
(
re.compile(
r'''
(?P<time>%s) # this, next, following, previous, last
\s+
((?P<number>\d+|(%s[-\s]?)+)\s)?
(?P<dmy>%s) # year, day, week, month, night, minute, min
((\s|,\s|\s(%s))?\s*(%s))?
''' % (re_timeframe, numbers, re_dmy, re_separator, re_time),
(re.VERBOSE | re.IGNORECASE),
),
lambda m, base_date: date_from_relative_week_year(
base_date,
m.group('time').lower(),
m.group('dmy').lower(),
m.group('number')
) + timedelta(**convert_time_to_hour_minute(
m.group('hour'),
m.group('minute'),
m.group('convention')
))
),
(
re.compile(
r'''
(?P<time>%s) # this, next, following, previous, last
\s+
(?P<dow>%s) # mon - fri
((\s|,\s|\s(%s))?\s*(%s))?
''' % (re_timeframe, day_names, re_separator, re_time),
(re.VERBOSE | re.IGNORECASE),
),
lambda m, base_date: date_from_relative_day(
base_date,
m.group('time').lower(),
m.group('dow')
) + timedelta(**convert_time_to_hour_minute(
m.group('hour'),
m.group('minute'),
m.group('convention')
))
),
(
re.compile(
r'''
(
(?P<day>\d{1,2}) # Day, Month
(%s)
[-\s] # One or more space
(?P<month>%s)
)
''' % (re_ordinal, month_names),
(re.VERBOSE | re.IGNORECASE)
),
lambda m, base_date: datetime(
base_date.year,
HASHMONTHS[m.group('month').strip().lower()],
int(m.group('day') if m.group('day') else 1)
)
),
(
re.compile(
r'''
(
(?P<month>%s) # Month, day
[-\s] # One or more space
((?P<day>\d{1,2})\b) # Matches a digit January 12
(%s)?
)
''' % (month_names, re_ordinal),
(re.VERBOSE | re.IGNORECASE)
),
lambda m, base_date: datetime(
base_date.year,
HASHMONTHS[m.group('month').strip().lower()],
int(m.group('day') if m.group('day') else 1)
)
),
(
re.compile(
r'''
(
(?P<month>%s) # Month, year
[-\s] # One or more space
((?P<year>\d{1,4})\b) # Matches a digit January 12
)
''' % (month_names),
(re.VERBOSE | re.IGNORECASE)
),
lambda m, base_date: datetime(
int(m.group('year')),
HASHMONTHS[m.group('month').strip().lower()],
1
)
),
(
re.compile(
r'''
(
(?P<month>\d{1,2}) # MM/DD or MM/DD/YYYY
/
((?P<day>\d{1,2}))
(/(?P<year>%s))?
)
''' % (re_year),
(re.VERBOSE | re.IGNORECASE)
),
lambda m, base_date: datetime(
int(m.group('year') if m.group('year') else base_date.year),
int(m.group('month').strip()),
int(m.group('day'))
)
),
(
re.compile(
r'''
(?P<adverb>%s) # today, yesterday, tomorrow, tonight
((\s|,\s|\s(%s))?\s*(%s))?
''' % (day_nearest_names, re_separator, re_time),
(re.VERBOSE | re.IGNORECASE)
),
lambda m, base_date: date_from_adverb(
base_date,
m.group('adverb')
) + timedelta(**convert_time_to_hour_minute(
m.group('hour'),
m.group('minute'),
m.group('convention')
))
),
(
re.compile(
r'''
(?P<named_day>%s) # Mon - Sun
''' % (day_names),
(re.VERBOSE | re.IGNORECASE)
),
lambda m, base_date: this_week_day(
base_date,
HASHWEEKDAYS[m.group('named_day').lower()]
)
),
(
re.compile(
r'''
(?P<year>%s) # Year
''' % (re_year),
(re.VERBOSE | re.IGNORECASE)
),
lambda m, base_date: datetime(int(m.group('year')), 1, 1)
),
(
re.compile(
r'''
(?P<month>%s) # Month
''' % (month_names_long),
(re.VERBOSE | re.IGNORECASE)
),
lambda m, base_date: datetime(
base_date.year,
HASHMONTHS[m.group('month').lower()],
1
)
),
(
re.compile(
r'''
(%s) # Matches time 12:00 am or 12:00 pm
''' % (re_time),
(re.VERBOSE | re.IGNORECASE),
),
lambda m, base_date: datetime(
base_date.year,
base_date.month,
base_date.day
) + timedelta(**convert_time_to_hour_minute(
m.group('hour'),
m.group('minute'),
m.group('convention')
))
),
(
re.compile(
r'''
(
(?P<hour>\d+) # Matches 12 hours, 2 hrs
\s+
(%s)
)
''' % ('|'.join(hour_variations)),
(re.VERBOSE | re.IGNORECASE),
),
lambda m, base_date: datetime(
base_date.year,
base_date.month,
base_date.day,
int(m.group('hour'))
)
)
]
def convert_string_to_number(value):
"""
Convert strings to numbers
"""
if value is None:
return 1
if isinstance(value, int):
return value
if value.isdigit():
return int(value)
num_list = map(lambda s: NUMBERS[s], re.findall(numbers + '+', value.lower()))
return sum(num_list)
def convert_time_to_hour_minute(hour, minute, convention):
"""
Convert time to hour, minute
"""
if hour is None:
hour = 0
if minute is None:
minute = 0
if convention is None:
convention = 'am'
hour = int(hour)
minute = int(minute)
if convention.lower() == 'pm':
hour += 12
return {'hours': hour, 'minutes': minute}
def date_from_quarter(base_date, ordinal, year):
"""
Extract date from quarter of a year
"""
interval = 3
month_start = interval * (ordinal - 1)
if month_start < 0:
month_start = 9
month_end = month_start + interval
if month_start == 0:
month_start = 1
return [
datetime(year, month_start, 1),
datetime(year, month_end, calendar.monthrange(year, month_end)[1])
]
def date_from_relative_day(base_date, time, dow):
"""
Converts relative day to time
Ex: this tuesday, last tuesday
"""
# Reset date to start of the day
base_date = datetime(base_date.year, base_date.month, base_date.day)
time = time.lower()
dow = dow.lower()
if time == 'this' or time == 'coming':
# Else day of week
num = HASHWEEKDAYS[dow]
return this_week_day(base_date, num)
elif time == 'last' or time == 'previous':
# Else day of week
num = HASHWEEKDAYS[dow]
return previous_week_day(base_date, num)
elif time == 'next' or time == 'following':
# Else day of week
num = HASHWEEKDAYS[dow]
return next_week_day(base_date, num)
def date_from_relative_week_year(base_date, time, dow, ordinal=1):
"""
Converts relative day to time
Eg. this tuesday, last tuesday
"""
# If there is an ordinal (next 3 weeks) => return a start and end range
# Reset date to start of the day
relative_date = datetime(base_date.year, base_date.month, base_date.day)
ord = convert_string_to_number(ordinal)
if dow in year_variations:
if time == 'this' or time == 'coming':
return datetime(relative_date.year, 1, 1)
elif time == 'last' or time == 'previous':
return datetime(relative_date.year - 1, relative_date.month, 1)
elif time == 'next' or time == 'following':
return relative_date + timedelta(ord * 365)
elif time == 'end of the':
return datetime(relative_date.year, 12, 31)
elif dow in month_variations:
if time == 'this':
return datetime(relative_date.year, relative_date.month, relative_date.day)
elif time == 'last' or time == 'previous':
return datetime(relative_date.year, relative_date.month - 1, relative_date.day)
elif time == 'next' or time == 'following':
if relative_date.month + ord >= 12:
month = relative_date.month - 1 + ord
year = relative_date.year + month // 12
month = month % 12 + 1
day = min(relative_date.day, calendar.monthrange(year, month)[1])
return datetime(year, month, day)
else:
return datetime(relative_date.year, relative_date.month + ord, relative_date.day)
elif time == 'end of the':
return datetime(
relative_date.year,
relative_date.month,
calendar.monthrange(relative_date.year, relative_date.month)[1]
)
elif dow in week_variations:
if time == 'this':
return relative_date - timedelta(days=relative_date.weekday())
elif time == 'last' or time == 'previous':
return relative_date - timedelta(weeks=1)
elif time == 'next' or time == 'following':
return relative_date + timedelta(weeks=ord)
elif time == 'end of the':
day_of_week = base_date.weekday()
return day_of_week + timedelta(days=6 - relative_date.weekday())
elif dow in day_variations:
if time == 'this':
return relative_date
elif time == 'last' or time == 'previous':
return relative_date - timedelta(days=1)
elif time == 'next' or time == 'following':
return relative_date + timedelta(days=ord)
elif time == 'end of the':
return datetime(relative_date.year, relative_date.month, relative_date.day, 23, 59, 59)
def date_from_adverb(base_date, name):
"""
Convert Day adverbs to dates
Tomorrow => Date
Today => Date
"""
# Reset date to start of the day
adverb_date = datetime(base_date.year, base_date.month, base_date.day)
if name == 'today' or name == 'tonite' or name == 'tonight':
return adverb_date.today()
elif name == 'yesterday':
return adverb_date - timedelta(days=1)
elif name == 'tomorrow' or name == 'tom':
return adverb_date + timedelta(days=1)
def date_from_duration(base_date, number_as_string, unit, duration, base_time=None):
"""
Find dates from duration
Eg: 20 days from now
Currently does not support strings like "20 days from last monday".
"""
# Check if query is `2 days before yesterday` or `day before yesterday`
if base_time is not None:
base_date = date_from_adverb(base_date, base_time)
num = convert_string_to_number(number_as_string)
if unit in day_variations:
args = {'days': num}
elif unit in minute_variations:
args = {'minutes': num}
elif unit in week_variations:
args = {'weeks': num}
elif unit in month_variations:
args = {'days': 365 * num / 12}
elif unit in year_variations:
args = {'years': num}
if duration == 'ago' or duration == 'before' or duration == 'earlier':
if 'years' in args:
return datetime(base_date.year - args['years'], base_date.month, base_date.day)
return base_date - timedelta(**args)
elif duration == 'after' or duration == 'later' or duration == 'from now':
if 'years' in args:
return datetime(base_date.year + args['years'], base_date.month, base_date.day)
return base_date + timedelta(**args)
def this_week_day(base_date, weekday):
"""
Finds coming weekday
"""
day_of_week = base_date.weekday()
# If today is Tuesday and the query is `this monday`
# We should output the next_week monday
if day_of_week > weekday:
return next_week_day(base_date, weekday)
start_of_this_week = base_date - timedelta(days=day_of_week + 1)
day = start_of_this_week + timedelta(days=1)
while day.weekday() != weekday:
day = day + timedelta(days=1)
return day
def previous_week_day(base_date, weekday):
"""
Finds previous weekday
"""
day = base_date - timedelta(days=1)
while day.weekday() != weekday:
day = day - timedelta(days=1)
return day
def next_week_day(base_date, weekday):
"""
Finds next weekday
"""
day_of_week = base_date.weekday()
end_of_this_week = base_date + timedelta(days=6 - day_of_week)
day = end_of_this_week + timedelta(days=1)
while day.weekday() != weekday:
day = day + timedelta(days=1)
return day
def datetime_parsing(text, base_date=datetime.now()):
"""
Extract datetime objects from a string of text.
"""
matches = []
found_array = []
# Find the position in the string
for expression, function in regex:
for match in expression.finditer(text):
matches.append((match.group(), function(match, base_date), match.span()))
# Wrap the matched text with TAG element to prevent nested selections
for match, value, spans in matches:
subn = re.subn(
'(?!<TAG[^>]*?>)' + match + '(?![^<]*?</TAG>)', '<TAG>' + match + '</TAG>', text
)
text = subn[0]
is_substituted = subn[1]
if is_substituted != 0:
found_array.append((match, value, spans))
# To preserve order of the match, sort based on the start position
return sorted(found_array, key=lambda match: match and match[2][0])