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532 lines
22 KiB
532 lines
22 KiB
# -*- coding: utf-8 -*-
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import datetime
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import calendar
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import operator
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from math import copysign
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from six import integer_types
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from warnings import warn
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from ._common import weekday
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MO, TU, WE, TH, FR, SA, SU = weekdays = tuple([weekday(x) for x in range(7)])
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__all__ = ["relativedelta", "MO", "TU", "WE", "TH", "FR", "SA", "SU"]
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class relativedelta(object):
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"""
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The relativedelta type is based on the specification of the excellent
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work done by M.-A. Lemburg in his
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`mx.DateTime <http://www.egenix.com/files/python/mxDateTime.html>`_ extension.
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However, 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 are 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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The second one is passing it any number of the following keyword arguments::
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relativedelta(arg1=x,arg2=y,arg3=z...)
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year, month, day, hour, minute, second, microsecond:
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Absolute information (argument is singular); adding or subtracting a
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relativedelta with absolute information does not perform an aritmetic
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operation, but rather REPLACES the corresponding value in the
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original datetime with the value(s) in relativedelta.
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years, months, weeks, days, hours, minutes, seconds, microseconds:
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Relative information, may be negative (argument is plural); adding
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or subtracting a relativedelta with relative information performs
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the corresponding aritmetic operation on the original datetime value
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with the information in the relativedelta.
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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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# Check for non-integer values in integer-only quantities
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if any(x is not None and x != int(x) for x in (years, months)):
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raise ValueError("Non-integer years and months are "
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"ambiguous and not currently supported.")
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if dt1 and dt2:
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# datetime is a subclass of date. So both must be date
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if not (isinstance(dt1, datetime.date) and
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isinstance(dt2, datetime.date)):
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raise TypeError("relativedelta only diffs datetime/date")
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# We allow two dates, or two datetimes, so we coerce them to be
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# of the same type
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if (isinstance(dt1, datetime.datetime) !=
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isinstance(dt2, datetime.datetime)):
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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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# Get year / month delta between the two
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months = (dt1.year - dt2.year) * 12 + (dt1.month - dt2.month)
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self._set_months(months)
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# Remove the year/month delta so the timedelta is just well-defined
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# time units (seconds, days and microseconds)
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dtm = self.__radd__(dt2)
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# If we've overshot our target, make an adjustment
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if dt1 < dt2:
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compare = operator.gt
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increment = 1
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else:
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compare = operator.lt
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increment = -1
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while compare(dt1, dtm):
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months += increment
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self._set_months(months)
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dtm = self.__radd__(dt2)
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# Get the timedelta between the "months-adjusted" date and dt1
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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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# Relative information
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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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# Absolute information
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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 any(x is not None and int(x) != x
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for x in (year, month, day, hour,
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minute, second, microsecond)):
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# For now we'll deprecate floats - later it'll be an error.
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warn("Non-integer value passed as absolute information. " +
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"This is not a well-defined condition and will raise " +
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"errors in future versions.", DeprecationWarning)
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if isinstance(weekday, integer_types):
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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,
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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 = _sign(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 = _sign(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 = _sign(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 = _sign(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 = _sign(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
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or 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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@property
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def weeks(self):
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return self.days // 7
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@weeks.setter
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def weeks(self, value):
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self.days = self.days - (self.weeks * 7) + value * 7
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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 = _sign(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 normalized(self):
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"""
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Return a version of this object represented entirely using integer
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values for the relative attributes.
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>>> relativedelta(days=1.5, hours=2).normalized()
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relativedelta(days=1, hours=14)
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:return:
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Returns a :class:`dateutil.relativedelta.relativedelta` object.
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"""
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# Cascade remainders down (rounding each to roughly nearest microsecond)
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days = int(self.days)
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hours_f = round(self.hours + 24 * (self.days - days), 11)
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hours = int(hours_f)
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minutes_f = round(self.minutes + 60 * (hours_f - hours), 10)
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minutes = int(minutes_f)
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seconds_f = round(self.seconds + 60 * (minutes_f - minutes), 8)
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seconds = int(seconds_f)
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microseconds = round(self.microseconds + 1e6 * (seconds_f - seconds))
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# Constructor carries overflow back up with call to _fix()
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return self.__class__(years=self.years, months=self.months,
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days=days, hours=hours, minutes=minutes,
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seconds=seconds, microseconds=microseconds,
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leapdays=self.leapdays, year=self.year,
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month=self.month, day=self.day,
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weekday=self.weekday, hour=self.hour,
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minute=self.minute, second=self.second,
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microsecond=self.microsecond)
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def __add__(self, other):
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if isinstance(other, relativedelta):
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return self.__class__(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 +
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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.microsecond or
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self.microsecond))
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if isinstance(other, datetime.timedelta):
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return self.__class__(years=self.years,
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months=self.months,
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days=self.days + other.days,
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hours=self.hours,
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minutes=self.minutes,
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seconds=self.seconds + other.seconds,
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microseconds=self.microseconds + other.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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if not isinstance(other, datetime.date):
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return NotImplemented
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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 __radd__(self, other):
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return self.__add__(other)
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def __rsub__(self, other):
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return self.__neg__().__radd__(other)
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def __sub__(self, other):
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if not isinstance(other, relativedelta):
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return NotImplemented # In case the other object defines __rsub__
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return self.__class__(years=self.years - other.years,
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months=self.months - other.months,
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days=self.days - other.days,
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hours=self.hours - other.hours,
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minutes=self.minutes - other.minutes,
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seconds=self.seconds - other.seconds,
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microseconds=self.microseconds - other.microseconds,
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leapdays=self.leapdays or other.leapdays,
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year=self.year or other.year,
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month=self.month or other.month,
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day=self.day or other.day,
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weekday=self.weekday or other.weekday,
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hour=self.hour or other.hour,
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minute=self.minute or other.minute,
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second=self.second or other.second,
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microsecond=self.microsecond or other.microsecond)
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def __neg__(self):
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return self.__class__(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 __bool__(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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# Compatibility with Python 2.x
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__nonzero__ = __bool__
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def __mul__(self, other):
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try:
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f = float(other)
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except TypeError:
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return NotImplemented
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return self.__class__(years=int(self.years * f),
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months=int(self.months * f),
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days=int(self.days * f),
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hours=int(self.hours * f),
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minutes=int(self.minutes * f),
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seconds=int(self.seconds * f),
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microseconds=int(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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__rmul__ = __mul__
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def __eq__(self, other):
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if not isinstance(other, relativedelta):
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return NotImplemented
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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.microseconds == other.microseconds 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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__hash__ = None
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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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try:
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reciprocal = 1 / float(other)
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except TypeError:
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return NotImplemented
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return self.__mul__(reciprocal)
|
|
|
|
__truediv__ = __div__
|
|
|
|
def __repr__(self):
|
|
l = []
|
|
for attr in ["years", "months", "days", "leapdays",
|
|
"hours", "minutes", "seconds", "microseconds"]:
|
|
value = getattr(self, attr)
|
|
if value:
|
|
l.append("{attr}={value:+g}".format(attr=attr, value=value))
|
|
for attr in ["year", "month", "day", "weekday",
|
|
"hour", "minute", "second", "microsecond"]:
|
|
value = getattr(self, attr)
|
|
if value is not None:
|
|
l.append("{attr}={value}".format(attr=attr, value=repr(value)))
|
|
return "{classname}({attrs})".format(classname=self.__class__.__name__,
|
|
attrs=", ".join(l))
|
|
|
|
def _sign(x):
|
|
return int(copysign(1, x))
|
|
|
|
# vim:ts=4:sw=4:et
|