165a883ed2aebe4f4c428e6acbf389bf62464e76
1 #
2 # Copyright (c) 2001 Bizar Software Pty Ltd (http://www.bizarsoftware.com.au/)
3 # This module is free software, and you may redistribute it and/or modify
4 # under the same terms as Python, so long as this copyright message and
5 # disclaimer are retained in their original form.
6 #
7 # IN NO EVENT SHALL BIZAR SOFTWARE PTY LTD BE LIABLE TO ANY PARTY FOR
8 # DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING
9 # OUT OF THE USE OF THIS CODE, EVEN IF THE AUTHOR HAS BEEN ADVISED OF THE
10 # POSSIBILITY OF SUCH DAMAGE.
11 #
12 # BIZAR SOFTWARE PTY LTD SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
13 # BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
14 # FOR A PARTICULAR PURPOSE. THE CODE PROVIDED HEREUNDER IS ON AN "AS IS"
15 # BASIS, AND THERE IS NO OBLIGATION WHATSOEVER TO PROVIDE MAINTENANCE,
16 # SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
17 #
18 # $Id: date.py,v 1.50 2003-03-19 05:18:10 richard Exp $
20 __doc__ = """
21 Date, time and time interval handling.
22 """
24 import time, re, calendar, types
25 from i18n import _
27 class Date:
28 '''
29 As strings, date-and-time stamps are specified with the date in
30 international standard format (yyyy-mm-dd) joined to the time
31 (hh:mm:ss) by a period ("."). Dates in this form can be easily compared
32 and are fairly readable when printed. An example of a valid stamp is
33 "2000-06-24.13:03:59". We'll call this the "full date format". When
34 Timestamp objects are printed as strings, they appear in the full date
35 format with the time always given in GMT. The full date format is
36 always exactly 19 characters long.
38 For user input, some partial forms are also permitted: the whole time
39 or just the seconds may be omitted; and the whole date may be omitted
40 or just the year may be omitted. If the time is given, the time is
41 interpreted in the user's local time zone. The Date constructor takes
42 care of these conversions. In the following examples, suppose that yyyy
43 is the current year, mm is the current month, and dd is the current day
44 of the month; and suppose that the user is on Eastern Standard Time.
46 "2000-04-17" means <Date 2000-04-17.00:00:00>
47 "01-25" means <Date yyyy-01-25.00:00:00>
48 "2000-04-17.03:45" means <Date 2000-04-17.08:45:00>
49 "08-13.22:13" means <Date yyyy-08-14.03:13:00>
50 "11-07.09:32:43" means <Date yyyy-11-07.14:32:43>
51 "14:25" means <Date yyyy-mm-dd.19:25:00>
52 "8:47:11" means <Date yyyy-mm-dd.13:47:11>
53 "." means "right now"
55 The Date class should understand simple date expressions of the form
56 stamp + interval and stamp - interval. When adding or subtracting
57 intervals involving months or years, the components are handled
58 separately. For example, when evaluating "2000-06-25 + 1m 10d", we
59 first add one month to get 2000-07-25, then add 10 days to get
60 2000-08-04 (rather than trying to decide whether 1m 10d means 38 or 40
61 or 41 days).
63 Example usage:
64 >>> Date(".")
65 <Date 2000-06-26.00:34:02>
66 >>> _.local(-5)
67 "2000-06-25.19:34:02"
68 >>> Date(". + 2d")
69 <Date 2000-06-28.00:34:02>
70 >>> Date("1997-04-17", -5)
71 <Date 1997-04-17.00:00:00>
72 >>> Date("01-25", -5)
73 <Date 2000-01-25.00:00:00>
74 >>> Date("08-13.22:13", -5)
75 <Date 2000-08-14.03:13:00>
76 >>> Date("14:25", -5)
77 <Date 2000-06-25.19:25:00>
79 The date format 'yyyymmddHHMMSS' (year, month, day, hour,
80 minute, second) is the serialisation format returned by the serialise()
81 method, and is accepted as an argument on instatiation.
82 '''
83 def __init__(self, spec='.', offset=0):
84 """Construct a date given a specification and a time zone offset.
86 'spec' is a full date or a partial form, with an optional
87 added or subtracted interval. Or a date 9-tuple.
88 'offset' is the local time zone offset from GMT in hours.
89 """
90 if type(spec) == type(''):
91 self.set(spec, offset=offset)
92 else:
93 y,m,d,H,M,S,x,x,x = spec
94 ts = calendar.timegm((y,m,d,H+offset,M,S,0,0,0))
95 self.year, self.month, self.day, self.hour, self.minute, \
96 self.second, x, x, x = time.gmtime(ts)
98 def set(self, spec, offset=0, date_re=re.compile(r'''
99 (((?P<y>\d\d\d\d)[/-])?(?P<m>\d\d?)?[/-](?P<d>\d\d?))? # [yyyy-]mm-dd
100 (?P<n>\.)? # .
101 (((?P<H>\d?\d):(?P<M>\d\d))?(:(?P<S>\d\d))?)? # hh:mm:ss
102 (?P<o>.+)? # offset
103 ''', re.VERBOSE), serialised_re=re.compile(r'''
104 (\d{4})(\d\d)(\d\d)(\d\d)(\d\d)(\d\d)
105 ''', re.VERBOSE)):
106 ''' set the date to the value in spec
107 '''
108 m = serialised_re.match(spec)
109 if m is not None:
110 # we're serialised - easy!
111 self.year, self.month, self.day, self.hour, self.minute, \
112 self.second = map(int, m.groups()[:6])
113 return
115 # not serialised data, try usual format
116 m = date_re.match(spec)
117 if m is None:
118 raise ValueError, _('Not a date spec: [[yyyy-]mm-dd].'
119 '[[h]h:mm[:ss]][offset]')
121 info = m.groupdict()
123 # get the current date as our default
124 y,m,d,H,M,S,x,x,x = time.gmtime(time.time())
126 # override year, month, day parts
127 if info['m'] is not None and info['d'] is not None:
128 m = int(info['m'])
129 d = int(info['d'])
130 if info['y'] is not None:
131 y = int(info['y'])
132 # time defaults to 00:00:00 GMT - offset (local midnight)
133 H = -offset
134 M = S = 0
136 # override hour, minute, second parts
137 if info['H'] is not None and info['M'] is not None:
138 H = int(info['H']) - offset
139 M = int(info['M'])
140 S = 0
141 if info['S'] is not None: S = int(info['S'])
143 # now handle the adjustment of hour
144 ts = calendar.timegm((y,m,d,H,M,S,0,0,0))
145 self.year, self.month, self.day, self.hour, self.minute, \
146 self.second, x, x, x = time.gmtime(ts)
148 if info.get('o', None):
149 try:
150 self.applyInterval(Interval(info['o'], allowdate=0))
151 except ValueError:
152 raise ValueError, _('Not a date spec: [[yyyy-]mm-dd].'
153 '[[h]h:mm[:ss]][offset]')
155 def addInterval(self, interval):
156 ''' Add the interval to this date, returning the date tuple
157 '''
158 # do the basic calc
159 sign = interval.sign
160 year = self.year + sign * interval.year
161 month = self.month + sign * interval.month
162 day = self.day + sign * interval.day
163 hour = self.hour + sign * interval.hour
164 minute = self.minute + sign * interval.minute
165 second = self.second + sign * interval.second
167 # now cope with under- and over-flow
168 # first do the time
169 while (second < 0 or second > 59 or minute < 0 or minute > 59 or
170 hour < 0 or hour > 59):
171 if second < 0: minute -= 1; second += 60
172 elif second > 59: minute += 1; second -= 60
173 if minute < 0: hour -= 1; minute += 60
174 elif minute > 59: hour += 1; minute -= 60
175 if hour < 0: day -= 1; hour += 24
176 elif hour > 59: day += 1; hour -= 24
178 # fix up the month so we're within range
179 while month < 1 or month > 12:
180 if month < 1: year -= 1; month += 12
181 if month > 12: year += 1; month -= 12
183 # now do the days, now that we know what month we're in
184 mdays = calendar.mdays
185 if month == 2 and calendar.isleap(year): month_days = 29
186 else: month_days = mdays[month]
187 while month < 1 or month > 12 or day < 0 or day > month_days:
188 # now to day under/over
189 if day < 0: month -= 1; day += month_days
190 elif day > month_days: month += 1; day -= month_days
192 # possibly fix up the month so we're within range
193 while month < 1 or month > 12:
194 if month < 1: year -= 1; month += 12
195 if month > 12: year += 1; month -= 12
197 # re-figure the number of days for this month
198 if month == 2 and calendar.isleap(year): month_days = 29
199 else: month_days = mdays[month]
200 return (year, month, day, hour, minute, second, 0, 0, 0)
202 def applyInterval(self, interval):
203 ''' Apply the interval to this date
204 '''
205 self.year, self.month, self.day, self.hour, self.minute, \
206 self.second, x, x, x = self.addInterval(interval)
208 def __add__(self, interval):
209 """Add an interval to this date to produce another date.
210 """
211 return Date(self.addInterval(interval))
213 # deviates from spec to allow subtraction of dates as well
214 def __sub__(self, other):
215 """ Subtract:
216 1. an interval from this date to produce another date.
217 2. a date from this date to produce an interval.
218 """
219 if isinstance(other, Interval):
220 other = Interval(other.get_tuple())
221 other.sign *= -1
222 return self.__add__(other)
224 assert isinstance(other, Date), 'May only subtract Dates or Intervals'
226 # TODO this code will fall over laughing if the dates cross
227 # leap years, phases of the moon, ....
228 a = calendar.timegm((self.year, self.month, self.day, self.hour,
229 self.minute, self.second, 0, 0, 0))
230 b = calendar.timegm((other.year, other.month, other.day,
231 other.hour, other.minute, other.second, 0, 0, 0))
232 diff = a - b
233 if diff < 0:
234 sign = 1
235 diff = -diff
236 else:
237 sign = -1
238 S = diff%60
239 M = (diff/60)%60
240 H = (diff/(60*60))%60
241 if H>1: S = 0
242 d = (diff/(24*60*60))%30
243 if d>1: H = S = M = 0
244 m = (diff/(30*24*60*60))%12
245 if m>1: H = S = M = 0
246 y = (diff/(365*24*60*60))
247 if y>1: d = H = S = M = 0
248 return Interval((y, m, d, H, M, S), sign=sign)
250 def __cmp__(self, other):
251 """Compare this date to another date."""
252 if other is None:
253 return 1
254 for attr in ('year', 'month', 'day', 'hour', 'minute', 'second'):
255 if not hasattr(other, attr):
256 return 1
257 r = cmp(getattr(self, attr), getattr(other, attr))
258 if r: return r
259 return 0
261 def __str__(self):
262 """Return this date as a string in the yyyy-mm-dd.hh:mm:ss format."""
263 return '%4d-%02d-%02d.%02d:%02d:%02d'%(self.year, self.month, self.day,
264 self.hour, self.minute, self.second)
266 def pretty(self, format='%d %B %Y'):
267 ''' print up the date date using a pretty format...
269 Note that if the day is zero, and the day appears first in the
270 format, then the day number will be removed from output.
271 '''
272 str = time.strftime(format, (self.year, self.month, self.day,
273 self.hour, self.minute, self.second, 0, 0, 0))
274 # handle zero day by removing it
275 if format.startswith('%d') and str[0] == '0':
276 return ' ' + str[1:]
277 return str
279 def __repr__(self):
280 return '<Date %s>'%self.__str__()
282 def local(self, offset):
283 """ Return this date as yyyy-mm-dd.hh:mm:ss in a local time zone.
284 """
285 return Date((self.year, self.month, self.day, self.hour + offset,
286 self.minute, self.second, 0, 0, 0))
288 def get_tuple(self):
289 return (self.year, self.month, self.day, self.hour, self.minute,
290 self.second, 0, 0, 0)
292 def serialise(self):
293 return '%4d%02d%02d%02d%02d%02d'%(self.year, self.month,
294 self.day, self.hour, self.minute, self.second)
296 class Interval:
297 '''
298 Date intervals are specified using the suffixes "y", "m", and "d". The
299 suffix "w" (for "week") means 7 days. Time intervals are specified in
300 hh:mm:ss format (the seconds may be omitted, but the hours and minutes
301 may not).
303 "3y" means three years
304 "2y 1m" means two years and one month
305 "1m 25d" means one month and 25 days
306 "2w 3d" means two weeks and three days
307 "1d 2:50" means one day, two hours, and 50 minutes
308 "14:00" means 14 hours
309 "0:04:33" means four minutes and 33 seconds
311 Example usage:
312 >>> Interval(" 3w 1 d 2:00")
313 <Interval + 22d 2:00>
314 >>> Date(". + 2d") + Interval("- 3w")
315 <Date 2000-06-07.00:34:02>
316 >>> Interval('1:59:59') + Interval('00:00:01')
317 <Interval + 2:00>
318 >>> Interval('2:00') + Interval('- 00:00:01')
319 <Interval + 1:59:59>
320 >>> Interval('1y')/2
321 <Interval + 6m>
322 >>> Interval('1:00')/2
323 <Interval + 0:30>
324 >>> Interval('2003-03-18')
325 <Interval + [number of days between now and 2003-03-18]>
326 >>> Interval('-4d 2003-03-18')
327 <Interval + [number of days between now and 2003-03-14]>
329 Interval arithmetic is handled in a couple of special ways, trying
330 to cater for the most common cases. Fundamentally, Intervals which
331 have both date and time parts will result in strange results in
332 arithmetic - because of the impossibility of handling day->month->year
333 over- and under-flows. Intervals may also be divided by some number.
335 Intervals are added to Dates in order of:
336 seconds, minutes, hours, years, months, days
338 Calculations involving months (eg '+2m') have no effect on days - only
339 days (or over/underflow from hours/mins/secs) will do that, and
340 days-per-month and leap years are accounted for. Leap seconds are not.
342 The interval format 'syyyymmddHHMMSS' (sign, year, month, day, hour,
343 minute, second) is the serialisation format returned by the serialise()
344 method, and is accepted as an argument on instatiation.
346 TODO: more examples, showing the order of addition operation
347 '''
348 def __init__(self, spec, sign=1, allowdate=1):
349 """Construct an interval given a specification."""
350 if type(spec) == type(''):
351 self.set(spec, allowdate)
352 else:
353 if len(spec) == 7:
354 self.sign, self.year, self.month, self.day, self.hour, \
355 self.minute, self.second = spec
356 else:
357 # old, buggy spec form
358 self.sign = sign
359 self.year, self.month, self.day, self.hour, self.minute, \
360 self.second = spec
362 def set(self, spec, allowdate=1, interval_re=re.compile('''
363 \s*(?P<s>[-+])? # + or -
364 \s*((?P<y>\d+\s*)y)? # year
365 \s*((?P<m>\d+\s*)m)? # month
366 \s*((?P<w>\d+\s*)w)? # week
367 \s*((?P<d>\d+\s*)d)? # day
368 \s*(((?P<H>\d+):(?P<M>\d+))?(:(?P<S>\d+))?)? # time
369 \s*(?P<D>
370 (\d\d\d\d[/-])?(\d\d?)?[/-](\d\d?)? # [yyyy-]mm-dd
371 \.? # .
372 (\d?\d:\d\d)?(:\d\d)? # hh:mm:ss
373 )?''', re.VERBOSE), serialised_re=re.compile('''
374 (?P<s>[+-])?1?(?P<y>([ ]{3}\d|\d{4}))(?P<m>\d{2})(?P<d>\d{2})
375 (?P<H>\d{2})(?P<M>\d{2})(?P<S>\d{2})''', re.VERBOSE)):
376 ''' set the date to the value in spec
377 '''
378 self.year = self.month = self.week = self.day = self.hour = \
379 self.minute = self.second = 0
380 self.sign = 1
381 m = serialised_re.match(spec)
382 if not m:
383 m = interval_re.match(spec)
384 if not m:
385 raise ValueError, _('Not an interval spec: [+-] [#y] [#m] [#w] '
386 '[#d] [[[H]H:MM]:SS] [date spec]')
388 # pull out all the info specified
389 info = m.groupdict()
390 valid = 0
391 for group, attr in {'y':'year', 'm':'month', 'w':'week', 'd':'day',
392 'H':'hour', 'M':'minute', 'S':'second'}.items():
393 if info.get(group, None) is not None:
394 valid = 1
395 setattr(self, attr, int(info[group]))
397 # make sure it's valid
398 if not valid and not info['D']:
399 raise ValueError, _('Not an interval spec: [+-] [#y] [#m] [#w] '
400 '[#d] [[[H]H:MM]:SS]')
402 if self.week:
403 self.day = self.day + self.week*7
405 if info['s'] is not None:
406 self.sign = {'+':1, '-':-1}[info['s']]
408 # use a date spec if one is given
409 if allowdate and info['D'] is not None:
410 now = Date('.')
411 date = Date(info['D'])
412 # if no time part was specified, nuke it in the "now" date
413 if not date.hour or date.minute or date.second:
414 now.hour = now.minute = now.second = 0
415 if date != now:
416 y = now - (date + self)
417 self.__init__(y.get_tuple())
419 def __cmp__(self, other):
420 """Compare this interval to another interval."""
421 if other is None:
422 # we are always larger than None
423 return 1
424 for attr in 'sign year month day hour minute second'.split():
425 r = cmp(getattr(self, attr), getattr(other, attr))
426 if r:
427 return r
428 return 0
430 def __str__(self):
431 """Return this interval as a string."""
432 l = []
433 if self.year: l.append('%sy'%self.year)
434 if self.month: l.append('%sm'%self.month)
435 if self.day: l.append('%sd'%self.day)
436 if self.second:
437 l.append('%d:%02d:%02d'%(self.hour, self.minute, self.second))
438 elif self.hour or self.minute:
439 l.append('%d:%02d'%(self.hour, self.minute))
440 if l:
441 l.insert(0, {1:'+', -1:'-'}[self.sign])
442 return ' '.join(l)
444 def __add__(self, other):
445 if isinstance(other, Date):
446 # the other is a Date - produce a Date
447 return Date(other.addInterval(self))
448 elif isinstance(other, Interval):
449 # add the other Interval to this one
450 a = self.get_tuple()
451 as = a[0]
452 b = other.get_tuple()
453 bs = b[0]
454 i = [as*x + bs*y for x,y in zip(a[1:],b[1:])]
455 i.insert(0, 1)
456 i = fixTimeOverflow(i)
457 return Interval(i)
458 # nope, no idea what to do with this other...
459 raise TypeError, "Can't add %r"%other
461 def __sub__(self, other):
462 if isinstance(other, Date):
463 # the other is a Date - produce a Date
464 interval = Interval(self.get_tuple())
465 interval.sign *= -1
466 return Date(other.addInterval(interval))
467 elif isinstance(other, Interval):
468 # add the other Interval to this one
469 a = self.get_tuple()
470 as = a[0]
471 b = other.get_tuple()
472 bs = b[0]
473 i = [as*x - bs*y for x,y in zip(a[1:],b[1:])]
474 i.insert(0, 1)
475 i = fixTimeOverflow(i)
476 return Interval(i)
477 # nope, no idea what to do with this other...
478 raise TypeError, "Can't add %r"%other
480 def __div__(self, other):
481 ''' Divide this interval by an int value.
483 Can't divide years and months sensibly in the _same_
484 calculation as days/time, so raise an error in that situation.
485 '''
486 try:
487 other = float(other)
488 except TypeError:
489 raise ValueError, "Can only divide Intervals by numbers"
491 y, m, d, H, M, S = (self.year, self.month, self.day,
492 self.hour, self.minute, self.second)
493 if y or m:
494 if d or H or M or S:
495 raise ValueError, "Can't divide Interval with date and time"
496 months = self.year*12 + self.month
497 months *= self.sign
499 months = int(months/other)
501 sign = months<0 and -1 or 1
502 m = months%12
503 y = months / 12
504 return Interval((sign, y, m, 0, 0, 0, 0))
506 else:
507 # handle a day/time division
508 seconds = S + M*60 + H*60*60 + d*60*60*24
509 seconds *= self.sign
511 seconds = int(seconds/other)
513 sign = seconds<0 and -1 or 1
514 seconds *= sign
515 S = seconds%60
516 seconds /= 60
517 M = seconds%60
518 seconds /= 60
519 H = seconds%24
520 d = seconds / 24
521 return Interval((sign, 0, 0, d, H, M, S))
523 def __repr__(self):
524 return '<Interval %s>'%self.__str__()
526 def pretty(self):
527 ''' print up the date date using one of these nice formats..
528 '''
529 if self.year:
530 if self.year == 1:
531 return _('1 year')
532 else:
533 return _('%(number)s years')%{'number': self.year}
534 elif self.month or self.day > 13:
535 days = (self.month * 30) + self.day
536 if days > 28:
537 if int(days/30) > 1:
538 s = _('%(number)s months')%{'number': int(days/30)}
539 else:
540 s = _('1 month')
541 else:
542 s = _('%(number)s weeks')%{'number': int(days/7)}
543 elif self.day > 7:
544 s = _('1 week')
545 elif self.day > 1:
546 s = _('%(number)s days')%{'number': self.day}
547 elif self.day == 1 or self.hour > 12:
548 if self.sign > 0:
549 return _('tomorrow')
550 else:
551 return _('yesterday')
552 elif self.hour > 1:
553 s = _('%(number)s hours')%{'number': self.hour}
554 elif self.hour == 1:
555 if self.minute < 15:
556 s = _('an hour')
557 elif self.minute/15 == 2:
558 s = _('1 1/2 hours')
559 else:
560 s = _('1 %(number)s/4 hours')%{'number': self.minute/15}
561 elif self.minute < 1:
562 if self.sign > 0:
563 return _('in a moment')
564 else:
565 return _('just now')
566 elif self.minute == 1:
567 s = _('1 minute')
568 elif self.minute < 15:
569 s = _('%(number)s minutes')%{'number': self.minute}
570 elif int(self.minute/15) == 2:
571 s = _('1/2 an hour')
572 else:
573 s = _('%(number)s/4 hour')%{'number': int(self.minute/15)}
574 if self.sign < 0:
575 s = s + _(' ago')
576 else:
577 s = _('in') + s
578 return s
580 def get_tuple(self):
581 return (self.sign, self.year, self.month, self.day, self.hour,
582 self.minute, self.second)
584 def serialise(self):
585 sign = self.sign > 0 and '+' or '-'
586 return '%s%04d%02d%02d%02d%02d%02d'%(sign, self.year, self.month,
587 self.day, self.hour, self.minute, self.second)
589 def fixTimeOverflow(time):
590 ''' Handle the overflow in the time portion (H, M, S) of "time":
591 (sign, y,m,d,H,M,S)
593 Overflow and underflow will at most affect the _days_ portion of
594 the date. We do not overflow days to months as we don't know _how_
595 to, generally.
596 '''
597 # XXX we could conceivably use this function for handling regular dates
598 # XXX too - we just need to interrogate the month/year for the day
599 # XXX overflow...
601 sign, y, m, d, H, M, S = time
602 seconds = sign * (S + M*60 + H*60*60 + d*60*60*24)
603 if seconds:
604 sign = seconds<0 and -1 or 1
605 seconds *= sign
606 S = seconds%60
607 seconds /= 60
608 M = seconds%60
609 seconds /= 60
610 H = seconds%24
611 d = seconds / 24
612 else:
613 months = y*12 + m
614 sign = months<0 and -1 or 1
615 months *= sign
616 m = months%12
617 y = months/12
619 return (sign, y, m, d, H, M, S)
621 class Range:
622 """
623 Represents range between two values
624 Ranges can be created using one of theese two alternative syntaxes:
626 1. Native english syntax:
627 [[From] <value>][ To <value>]
628 Keywords "From" and "To" are case insensitive. Keyword "From" is optional.
630 2. "Geek" syntax:
631 [<value>][; <value>]
633 Either first or second <value> can be omitted in both syntaxes.
635 Examples (consider local time is Sat Mar 8 22:07:48 EET 2003):
636 >>> Range("from 2-12 to 4-2")
637 <Range from 2003-02-12.00:00:00 to 2003-04-02.00:00:00>
639 >>> Range("18:00 TO +2m")
640 <Range from 2003-03-08.18:00:00 to 2003-05-08.20:07:48>
642 >>> Range("12:00")
643 <Range from 2003-03-08.12:00:00 to None>
645 >>> Range("tO +3d")
646 <Range from None to 2003-03-11.20:07:48>
648 >>> Range("2002-11-10; 2002-12-12")
649 <Range from 2002-11-10.00:00:00 to 2002-12-12.00:00:00>
651 >>> Range("; 20:00 +1d")
652 <Range from None to 2003-03-09.20:00:00>
654 """
655 def __init__(self, spec, Type, **params):
656 """Initializes Range of type <Type> from given <spec> string.
658 Sets two properties - from_value and to_value. None assigned to any of
659 this properties means "infinitum" (-infinitum to from_value and
660 +infinitum to to_value)
662 The Type parameter here should be class itself (e.g. Date), not a
663 class instance.
665 """
666 self.range_type = Type
667 re_range = r'(?:^|(?:from)?(.+?))(?:to(.+?)$|$)'
668 re_geek_range = r'(?:^|(.+?))(?:;(.+?)$|$)'
669 # Check which syntax to use
670 if spec.find(';') == -1:
671 # Native english
672 mch_range = re.search(re_range, spec.strip(), re.IGNORECASE)
673 else:
674 # Geek
675 mch_range = re.search(re_geek_range, spec.strip())
676 if mch_range:
677 self.from_value, self.to_value = mch_range.groups()
678 if self.from_value:
679 self.from_value = Type(self.from_value.strip(), **params)
680 if self.to_value:
681 self.to_value = Type(self.to_value.strip(), **params)
682 else:
683 raise ValueError, "Invalid range"
685 def __str__(self):
686 return "from %s to %s" % (self.from_value, self.to_value)
688 def __repr__(self):
689 return "<Range %s>" % self.__str__()
691 def test_range():
692 rspecs = ("from 2-12 to 4-2", "18:00 TO +2m", "12:00", "tO +3d",
693 "2002-11-10; 2002-12-12", "; 20:00 +1d")
694 for rspec in rspecs:
695 print '>>> Range("%s")' % rspec
696 print `Range(rspec, Date)`
697 print
699 def test():
700 intervals = (" 3w 1 d 2:00", " + 2d", "3w")
701 for interval in intervals:
702 print '>>> Interval("%s")'%interval
703 print `Interval(interval)`
705 dates = (".", "2000-06-25.19:34:02", ". + 2d", "1997-04-17", "01-25",
706 "08-13.22:13", "14:25")
707 for date in dates:
708 print '>>> Date("%s")'%date
709 print `Date(date)`
711 sums = ((". + 2d", "3w"), (".", " 3w 1 d 2:00"))
712 for date, interval in sums:
713 print '>>> Date("%s") + Interval("%s")'%(date, interval)
714 print `Date(date) + Interval(interval)`
716 if __name__ == '__main__':
717 test_range()
719 # vim: set filetype=python ts=4 sw=4 et si