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431 lines
17 KiB
Python
431 lines
17 KiB
Python
"""
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Copyright (c) 2003-2010 Gustavo Niemeyer <gustavo@niemeyer.net>
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This module offers extensions to the standard python 2.3+
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datetime module.
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"""
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__author__ = "Gustavo Niemeyer <gustavo@niemeyer.net>"
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__license__ = "PSF License"
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import datetime
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import calendar
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__all__ = ["relativedelta", "MO", "TU", "WE", "TH", "FR", "SA", "SU"]
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class weekday(object):
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__slots__ = ["weekday", "n"]
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def __init__(self, weekday, n=None):
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self.weekday = weekday
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self.n = n
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def __call__(self, n):
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if n == self.n:
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return self
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else:
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return self.__class__(self.weekday, n)
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def __eq__(self, other):
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try:
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if self.weekday != other.weekday or self.n != other.n:
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return False
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except AttributeError:
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return False
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return True
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def __repr__(self):
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s = ("MO", "TU", "WE", "TH", "FR", "SA", "SU")[self.weekday]
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if not self.n:
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return s
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else:
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return "%s(%+d)" % (s, self.n)
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MO, TU, WE, TH, FR, SA, SU = weekdays = tuple([weekday(x) for x in range(7)])
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class relativedelta:
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"""
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The relativedelta type is based on the specification of the excelent
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work done by M.-A. Lemburg in his mx.DateTime extension. However,
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notice that this type does *NOT* implement the same algorithm as
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his work. Do *NOT* expect it to behave like mx.DateTime's counterpart.
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There's two different ways to build a relativedelta instance. The
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first one is passing it two date/datetime classes:
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relativedelta(datetime1, datetime2)
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And the other way is to use the following keyword arguments:
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year, month, day, hour, minute, second, microsecond:
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Absolute information.
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years, months, weeks, days, hours, minutes, seconds, microseconds:
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Relative information, may be negative.
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weekday:
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One of the weekday instances (MO, TU, etc). These instances may
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receive a parameter N, specifying the Nth weekday, which could
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be positive or negative (like MO(+1) or MO(-2). Not specifying
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it is the same as specifying +1. You can also use an integer,
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where 0=MO.
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leapdays:
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Will add given days to the date found, if year is a leap
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year, and the date found is post 28 of february.
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yearday, nlyearday:
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Set the yearday or the non-leap year day (jump leap days).
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These are converted to day/month/leapdays information.
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Here is the behavior of operations with relativedelta:
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1) Calculate the absolute year, using the 'year' argument, or the
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original datetime year, if the argument is not present.
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2) Add the relative 'years' argument to the absolute year.
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3) Do steps 1 and 2 for month/months.
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4) Calculate the absolute day, using the 'day' argument, or the
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original datetime day, if the argument is not present. Then,
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subtract from the day until it fits in the year and month
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found after their operations.
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5) Add the relative 'days' argument to the absolute day. Notice
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that the 'weeks' argument is multiplied by 7 and added to
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'days'.
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6) Do steps 1 and 2 for hour/hours, minute/minutes, second/seconds,
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microsecond/microseconds.
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7) If the 'weekday' argument is present, calculate the weekday,
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with the given (wday, nth) tuple. wday is the index of the
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weekday (0-6, 0=Mon), and nth is the number of weeks to add
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forward or backward, depending on its signal. Notice that if
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the calculated date is already Monday, for example, using
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(0, 1) or (0, -1) won't change the day.
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"""
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def __init__(self, dt1=None, dt2=None,
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years=0, months=0, days=0, leapdays=0, weeks=0,
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hours=0, minutes=0, seconds=0, microseconds=0,
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year=None, month=None, day=None, weekday=None,
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yearday=None, nlyearday=None,
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hour=None, minute=None, second=None, microsecond=None):
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if dt1 and dt2:
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if not isinstance(dt1, datetime.date) or \
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not isinstance(dt2, datetime.date):
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raise TypeError, "relativedelta only diffs datetime/date"
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if type(dt1) is not type(dt2):
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if not isinstance(dt1, datetime.datetime):
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dt1 = datetime.datetime.fromordinal(dt1.toordinal())
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elif not isinstance(dt2, datetime.datetime):
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dt2 = datetime.datetime.fromordinal(dt2.toordinal())
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self.years = 0
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self.months = 0
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self.days = 0
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self.leapdays = 0
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self.hours = 0
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self.minutes = 0
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self.seconds = 0
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self.microseconds = 0
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self.year = None
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self.month = None
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self.day = None
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self.weekday = None
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self.hour = None
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self.minute = None
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self.second = None
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self.microsecond = None
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self._has_time = 0
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months = (dt1.year*12+dt1.month)-(dt2.year*12+dt2.month)
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self._set_months(months)
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dtm = self.__radd__(dt2)
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if dt1 < dt2:
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while dt1 > dtm:
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months += 1
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self._set_months(months)
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dtm = self.__radd__(dt2)
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else:
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while dt1 < dtm:
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months -= 1
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self._set_months(months)
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dtm = self.__radd__(dt2)
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delta = dt1 - dtm
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self.seconds = delta.seconds+delta.days*86400
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self.microseconds = delta.microseconds
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else:
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self.years = years
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self.months = months
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self.days = days+weeks*7
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self.leapdays = leapdays
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self.hours = hours
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self.minutes = minutes
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self.seconds = seconds
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self.microseconds = microseconds
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self.year = year
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self.month = month
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self.day = day
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self.hour = hour
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self.minute = minute
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self.second = second
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self.microsecond = microsecond
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if type(weekday) is int:
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self.weekday = weekdays[weekday]
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else:
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self.weekday = weekday
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yday = 0
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if nlyearday:
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yday = nlyearday
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elif yearday:
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yday = yearday
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if yearday > 59:
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self.leapdays = -1
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if yday:
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ydayidx = [31,59,90,120,151,181,212,243,273,304,334,366]
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for idx, ydays in enumerate(ydayidx):
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if yday <= ydays:
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self.month = idx+1
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if idx == 0:
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self.day = yday
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else:
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self.day = yday-ydayidx[idx-1]
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break
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else:
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raise ValueError, "invalid year day (%d)" % yday
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self._fix()
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def _fix(self):
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if abs(self.microseconds) > 999999:
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s = self.microseconds//abs(self.microseconds)
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div, mod = divmod(self.microseconds*s, 1000000)
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self.microseconds = mod*s
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self.seconds += div*s
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if abs(self.seconds) > 59:
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s = self.seconds//abs(self.seconds)
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div, mod = divmod(self.seconds*s, 60)
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self.seconds = mod*s
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self.minutes += div*s
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if abs(self.minutes) > 59:
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s = self.minutes//abs(self.minutes)
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div, mod = divmod(self.minutes*s, 60)
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self.minutes = mod*s
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self.hours += div*s
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if abs(self.hours) > 23:
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s = self.hours//abs(self.hours)
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div, mod = divmod(self.hours*s, 24)
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self.hours = mod*s
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self.days += div*s
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if abs(self.months) > 11:
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s = self.months//abs(self.months)
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div, mod = divmod(self.months*s, 12)
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self.months = mod*s
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self.years += div*s
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if (self.hours or self.minutes or self.seconds or self.microseconds or
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self.hour is not None or self.minute is not None or
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self.second is not None or self.microsecond is not None):
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self._has_time = 1
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else:
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self._has_time = 0
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def _set_months(self, months):
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self.months = months
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if abs(self.months) > 11:
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s = self.months//abs(self.months)
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div, mod = divmod(self.months*s, 12)
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self.months = mod*s
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self.years = div*s
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else:
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self.years = 0
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def __radd__(self, other):
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if not isinstance(other, datetime.date):
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raise TypeError, "unsupported type for add operation"
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elif self._has_time and not isinstance(other, datetime.datetime):
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other = datetime.datetime.fromordinal(other.toordinal())
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year = (self.year or other.year)+self.years
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month = self.month or other.month
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if self.months:
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assert 1 <= abs(self.months) <= 12
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month += self.months
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if month > 12:
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year += 1
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month -= 12
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elif month < 1:
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year -= 1
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month += 12
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day = min(calendar.monthrange(year, month)[1],
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self.day or other.day)
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repl = {"year": year, "month": month, "day": day}
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for attr in ["hour", "minute", "second", "microsecond"]:
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value = getattr(self, attr)
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if value is not None:
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repl[attr] = value
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days = self.days
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if self.leapdays and month > 2 and calendar.isleap(year):
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days += self.leapdays
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ret = (other.replace(**repl)
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+ datetime.timedelta(days=days,
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hours=self.hours,
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minutes=self.minutes,
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seconds=self.seconds,
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microseconds=self.microseconds))
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if self.weekday:
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weekday, nth = self.weekday.weekday, self.weekday.n or 1
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jumpdays = (abs(nth)-1)*7
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if nth > 0:
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jumpdays += (7-ret.weekday()+weekday)%7
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else:
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jumpdays += (ret.weekday()-weekday)%7
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jumpdays *= -1
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ret += datetime.timedelta(days=jumpdays)
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return ret
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def __rsub__(self, other):
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return self.__neg__().__radd__(other)
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def __add__(self, other):
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if not isinstance(other, relativedelta):
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raise TypeError, "unsupported type for add operation"
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return relativedelta(years=other.years+self.years,
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months=other.months+self.months,
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days=other.days+self.days,
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hours=other.hours+self.hours,
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minutes=other.minutes+self.minutes,
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seconds=other.seconds+self.seconds,
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microseconds=other.microseconds+self.microseconds,
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leapdays=other.leapdays or self.leapdays,
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year=other.year or self.year,
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month=other.month or self.month,
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day=other.day or self.day,
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weekday=other.weekday or self.weekday,
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hour=other.hour or self.hour,
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minute=other.minute or self.minute,
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second=other.second or self.second,
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microsecond=other.second or self.microsecond)
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def __sub__(self, other):
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if not isinstance(other, relativedelta):
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raise TypeError, "unsupported type for sub operation"
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return relativedelta(years=other.years-self.years,
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months=other.months-self.months,
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days=other.days-self.days,
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hours=other.hours-self.hours,
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minutes=other.minutes-self.minutes,
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seconds=other.seconds-self.seconds,
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microseconds=other.microseconds-self.microseconds,
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leapdays=other.leapdays or self.leapdays,
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year=other.year or self.year,
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month=other.month or self.month,
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day=other.day or self.day,
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weekday=other.weekday or self.weekday,
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hour=other.hour or self.hour,
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minute=other.minute or self.minute,
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second=other.second or self.second,
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microsecond=other.second or self.microsecond)
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def __neg__(self):
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return relativedelta(years=-self.years,
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months=-self.months,
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days=-self.days,
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hours=-self.hours,
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minutes=-self.minutes,
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seconds=-self.seconds,
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microseconds=-self.microseconds,
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leapdays=self.leapdays,
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year=self.year,
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month=self.month,
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day=self.day,
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weekday=self.weekday,
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hour=self.hour,
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minute=self.minute,
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second=self.second,
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microsecond=self.microsecond)
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def __nonzero__(self):
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return not (not self.years and
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not self.months and
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not self.days and
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not self.hours and
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not self.minutes and
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not self.seconds and
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not self.microseconds and
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not self.leapdays and
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self.year is None and
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self.month is None and
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self.day is None and
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self.weekday is None and
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self.hour is None and
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self.minute is None and
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self.second is None and
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self.microsecond is None)
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def __mul__(self, other):
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f = float(other)
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return relativedelta(years=self.years*f,
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months=self.months*f,
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days=self.days*f,
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hours=self.hours*f,
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minutes=self.minutes*f,
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seconds=self.seconds*f,
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microseconds=self.microseconds*f,
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leapdays=self.leapdays,
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year=self.year,
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month=self.month,
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day=self.day,
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weekday=self.weekday,
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hour=self.hour,
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minute=self.minute,
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second=self.second,
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microsecond=self.microsecond)
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def __eq__(self, other):
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if not isinstance(other, relativedelta):
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return False
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if self.weekday or other.weekday:
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if not self.weekday or not other.weekday:
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return False
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if self.weekday.weekday != other.weekday.weekday:
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return False
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n1, n2 = self.weekday.n, other.weekday.n
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if n1 != n2 and not ((not n1 or n1 == 1) and (not n2 or n2 == 1)):
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return False
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return (self.years == other.years and
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self.months == other.months and
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self.days == other.days and
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self.hours == other.hours and
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self.minutes == other.minutes and
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self.seconds == other.seconds and
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self.leapdays == other.leapdays and
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self.year == other.year and
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self.month == other.month and
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self.day == other.day and
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self.hour == other.hour and
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self.minute == other.minute and
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self.second == other.second and
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self.microsecond == other.microsecond)
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def __ne__(self, other):
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return not self.__eq__(other)
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def __div__(self, other):
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return self.__mul__(1/float(other))
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def __repr__(self):
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l = []
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for attr in ["years", "months", "days", "leapdays",
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"hours", "minutes", "seconds", "microseconds"]:
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value = getattr(self, attr)
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if value:
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l.append("%s=%+d" % (attr, value))
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for attr in ["year", "month", "day", "weekday",
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"hour", "minute", "second", "microsecond"]:
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value = getattr(self, attr)
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if value is not None:
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l.append("%s=%s" % (attr, `value`))
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return "%s(%s)" % (self.__class__.__name__, ", ".join(l))
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