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