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# This module is a very stripped down version of the dateutil
# package for when dateutil has not been installed. As a replacement
# for dateutil.parser.parse, the parsing methods from
# http://blog.mfabrik.com/2008/06/30/relativity-of-time-shortcomings-in-python-datetime-and-workaround/
#As such, the following copyrights and licenses applies:
# dateutil - Extensions to the standard python 2.3+ datetime module.
#
# Copyright (c) 2003-2011 - Gustavo Niemeyer <gustavo@niemeyer.net>
#
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
#
# * Redistributions of source code must retain the above copyright notice,
# this list of conditions and the following disclaimer.
# * Redistributions in binary form must reproduce the above copyright notice,
# this list of conditions and the following disclaimer in the documentation
# and/or other materials provided with the distribution.
# * Neither the name of the copyright holder nor the names of its
# contributors may be used to endorse or promote products derived from
# this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
# CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
# EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
# PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
# PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
# LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
# NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
# SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
# fixed_dateime
#
# Copyright (c) 2008, Red Innovation Ltd., Finland
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
# * Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# * Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in the
# documentation and/or other materials provided with the distribution.
# * Neither the name of Red Innovation nor the names of its contributors
# may be used to endorse or promote products derived from this software
# without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY RED INNOVATION ``AS IS'' AND ANY
# EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
# DISCLAIMED. IN NO EVENT SHALL RED INNOVATION BE LIABLE FOR ANY
# DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
# (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
# LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
# ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
# SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
import re
import math
import datetime
ZERO = datetime.timedelta(0)
try:
from dateutil.parser import parse as parse_iso
from dateutil.tz import tzoffset, tzutc
except:
# As a stopgap, define the two timezones here based
# on the dateutil code.
class tzutc(datetime.tzinfo):
def utcoffset(self, dt):
return ZERO
def dst(self, dt):
return ZERO
def tzname(self, dt):
return "UTC"
def __eq__(self, other):
return (isinstance(other, tzutc) or
(isinstance(other, tzoffset) and other._offset == ZERO))
def __ne__(self, other):
return not self.__eq__(other)
def __repr__(self):
return "%s()" % self.__class__.__name__
__reduce__ = object.__reduce__
class tzoffset(datetime.tzinfo):
def __init__(self, name, offset):
self._name = name
self._offset = datetime.timedelta(seconds=offset)
def utcoffset(self, dt):
return self._offset
def dst(self, dt):
return ZERO
def tzname(self, dt):
return self._name
def __eq__(self, other):
return (isinstance(other, tzoffset) and
self._offset == other._offset)
def __ne__(self, other):
return not self.__eq__(other)
def __repr__(self):
return "%s(%s, %s)" % (self.__class__.__name__,
repr(self._name),
self._offset.days*86400+self._offset.seconds)
__reduce__ = object.__reduce__
_fixed_offset_tzs = { }
UTC = tzutc()
def _get_fixed_offset_tz(offsetmins):
"""For internal use only: Returns a tzinfo with
the given fixed offset. This creates only one instance
for each offset; the zones are kept in a dictionary"""
if offsetmins == 0:
return UTC
if not offsetmins in _fixed_offset_tzs:
if offsetmins < 0:
sign = '-'
absoff = -offsetmins
else:
sign = '+'
absoff = offsetmins
name = "UTC%s%02d:%02d" % (sign, int(absoff / 60), absoff % 60)
inst = tzoffset(offsetmins, name)
_fixed_offset_tzs[offsetmins] = inst
return _fixed_offset_tzs[offsetmins]
_iso8601_parser = re.compile("""
^
(?P<year> [0-9]{4})?(?P<ymdsep>-?)?
(?P<month>[0-9]{2})?(?P=ymdsep)?
(?P<day> [0-9]{2})?
(?: # time part... optional... at least hour must be specified
(?:T|\s+)?
(?P<hour>[0-9]{2})
(?:
# minutes, separated with :, or none, from hours
(?P<hmssep>[:]?)
(?P<minute>[0-9]{2})
(?:
# same for seconds, separated with :, or none, from hours
(?P=hmssep)
(?P<second>[0-9]{2})
)?
)?
# fractions
(?: [,.] (?P<frac>[0-9]{1,10}))?
# timezone, Z, +-hh or +-hh:?mm. MUST BE, but complain if not there.
(
(?P<tzempty>Z)
|
(?P<tzh>[+-][0-9]{2})
(?: :? # optional separator
(?P<tzm>[0-9]{2})
)?
)?
)?
$
""", re.X) # """
def parse_iso(timestamp):
"""Internal function for parsing a timestamp in
ISO 8601 format"""
timestamp = timestamp.strip()
m = _iso8601_parser.match(timestamp)
if not m:
raise ValueError("Not a proper ISO 8601 timestamp!: %s" % timestamp)
vals = m.groupdict()
def_vals = {'year': 1970, 'month': 1, 'day': 1}
for key in vals:
if vals[key] is None:
vals[key] = def_vals.get(key, 0)
elif key not in ['ymdsep', 'hmssep', 'tzempty']:
vals[key] = int(vals[key])
year = vals['year']
month = vals['month']
day = vals['day']
h, min, s, us = None, None, None, 0
frac = 0
if m.group('tzempty') == None and m.group('tzh') == None:
raise ValueError("Not a proper ISO 8601 timestamp: " +
"missing timezone (Z or +hh[:mm])!")
if m.group('frac'):
frac = m.group('frac')
power = len(frac)
frac = int(frac) / 10.0 ** power
if m.group('hour'):
h = vals['hour']
if m.group('minute'):
min = vals['minute']
if m.group('second'):
s = vals['second']
if frac != None:
# ok, fractions of hour?
if min == None:
frac, min = math.modf(frac * 60.0)
min = int(min)
# fractions of second?
if s == None:
frac, s = math.modf(frac * 60.0)
s = int(s)
# and extract microseconds...
us = int(frac * 1000000)
if m.group('tzempty') == 'Z':
offsetmins = 0
else:
# timezone: hour diff with sign
offsetmins = vals['tzh'] * 60
tzm = m.group('tzm')
# add optional minutes
if tzm != None:
tzm = int(tzm)
offsetmins += tzm if offsetmins > 0 else -tzm
tz = _get_fixed_offset_tz(offsetmins)
return datetime.datetime(year, month, day, h, min, s, us, tz)
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