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# Copyright 2009 Canonical Ltd. All rights reserved.
# This file is part of wadllib.
#
# wadllib is free software: you can redistribute it and/or modify it under the
# terms of the GNU Lesser General Public License as published by the Free
# Software Foundation, version 3 of the License.
#
# wadllib is distributed in the hope that it will be useful, but WITHOUT ANY
# WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
# FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
# details.
#
# You should have received a copy of the GNU Lesser General Public License
# along with wadllib. If not, see <http://www.gnu.org/licenses/>.
"""
Parser for ISO 8601 time strings
================================
>>> d = iso_strptime("2008-01-07T05:30:30.345323+03:00")
>>> d
datetime.datetime(2008, 1, 7, 5, 30, 30, 345323, tzinfo=TimeZone(10800))
>>> d.timetuple()
(2008, 1, 7, 5, 30, 30, 0, 7, 0)
>>> d.utctimetuple()
(2008, 1, 7, 2, 30, 30, 0, 7, 0)
>>> iso_strptime("2008-01-07T05:30:30.345323-03:00")
datetime.datetime(2008, 1, 7, 5, 30, 30, 345323, tzinfo=TimeZone(-10800))
>>> iso_strptime("2008-01-07T05:30:30.345323")
datetime.datetime(2008, 1, 7, 5, 30, 30, 345323)
>>> iso_strptime("2008-01-07T05:30:30")
datetime.datetime(2008, 1, 7, 5, 30, 30)
>>> iso_strptime("2008-01-07T05:30:30+02:00")
datetime.datetime(2008, 1, 7, 5, 30, 30, tzinfo=TimeZone(7200))
"""
import re
import datetime
RE_TIME = re.compile(r"""^
# pattern matching date
(?P<year>\d{4})\-(?P<month>\d{2})\-(?P<day>\d{2})
# separator
T
# pattern matching time
(?P<hour>\d{2})\:(?P<minutes>\d{2})\:(?P<seconds>\d{2})
# pattern matching optional microseconds
(\.(?P<microseconds>\d{6}))?
# pattern matching optional timezone offset
(?P<tz_offset>[\-\+]\d{2}\:\d{2})?
$""", re.VERBOSE)
class TimeZone(datetime.tzinfo):
def __init__(self, tz_string):
hours, minutes = tz_string.lstrip("-+").split(":")
self.stdoffset = datetime.timedelta(hours=int(hours),
minutes=int(minutes))
if tz_string.startswith("-"):
self.stdoffset *= -1
def __repr__(self):
return "TimeZone(%s)" % (
self.stdoffset.days*24*60*60 + self.stdoffset.seconds)
def utcoffset(self, dt):
return self.stdoffset
def dst(self, dt):
return datetime.timedelta(0)
def iso_strptime(time_str):
x = RE_TIME.match(time_str)
if not x:
raise ValueError
d = datetime.datetime(int(x.group("year")), int(x.group("month")),
int(x.group("day")), int(x.group("hour")), int(x.group("minutes")),
int(x.group("seconds")))
if x.group("microseconds"):
d = d.replace(microsecond=int(x.group("microseconds")))
if x.group("tz_offset"):
d = d.replace(tzinfo=TimeZone(x.group("tz_offset")))
return d