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82 lines
2.8 KiB
Python
82 lines
2.8 KiB
Python
###
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# Copyright (c) 2021, Valentin Lorentz
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# All rights reserved.
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions are met:
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#
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# * Redistributions of source code must retain the above copyright notice,
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# this list of conditions, and the following disclaimer.
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# * Redistributions in binary form must reproduce the above copyright notice,
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# this list of conditions, and the following disclaimer in the
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# documentation and/or other materials provided with the distribution.
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# * Neither the name of the author of this software nor the name of
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# contributors to this software may be used to endorse or promote products
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# derived from this software without specific prior written consent.
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#
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# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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# POSSIBILITY OF SUCH DAMAGE.
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###
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import re
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import sys
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if sys.version_info >= (3, 9):
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import zoneinfo
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else:
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zoneinfo = None
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try:
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import pytz
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except ImportError:
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pytz = None
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_IANA_TZ_RE = re.compile("([\w_-]+/)*[\w_-]+")
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class TimezoneException(Exception):
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pass
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class MissingTimezoneLibrary(TimezoneException):
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pass
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class UnknownTimeZone(TimezoneException):
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pass
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def iana_timezone(name):
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"""Returns a :class:datetime.tzinfo object, given an IANA timezone name,
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eg. ``"Europe/Paris"``.
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This uses :class:``zoneinfo.ZoneInfo`` if available,
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:func:``pytz.timezone`` otherwise.
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May raise instances of :exc:`TimezoneException`.
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"""
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if not _IANA_TZ_RE.match(name):
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raise UnknownTimeZone(name)
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if zoneinfo:
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try:
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return zoneinfo.ZoneInfo(name)
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except zoneinfo.ZoneInfoNotFoundError as e:
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raise UnknownTimeZone(e.args[0]) from None
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elif pytz:
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try:
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timezone = pytz.timezone(name)
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except pytz.UnknownTimeZoneError as e:
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raise UnknownTimeZone(e.args[0]) from None
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else:
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raise MissingTimezoneLibrary(
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"Could not find a timezone library. "
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"Update Python to version 3.9 or newer, or install pytz."
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)
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