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+"""tzinfo implementations for psycopg2
+
+This module holds two different tzinfo implementations that can be used as
+the 'tzinfo' argument to datetime constructors, directly passed to psycopg
+functions or used to set the .tzinfo_factory attribute in cursors.
+"""
+# psycopg/tz.py - tzinfo implementation
+#
+# Copyright (C) 2003-2019 Federico Di Gregorio <fog@debian.org>
+# Copyright (C) 2020-2021 The Psycopg Team
+#
+# psycopg2 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, either version 3 of the License, or
+# (at your option) any later version.
+#
+# In addition, as a special exception, the copyright holders give
+# permission to link this program with the OpenSSL library (or with
+# modified versions of OpenSSL that use the same license as OpenSSL),
+# and distribute linked combinations including the two.
+#
+# You must obey the GNU Lesser General Public License in all respects for
+# all of the code used other than OpenSSL.
+#
+# psycopg2 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.
+
+import datetime
+import time
+
+ZERO = datetime.timedelta(0)
+
+
+class FixedOffsetTimezone(datetime.tzinfo):
+ """Fixed offset in minutes east from UTC.
+
+ This is exactly the implementation__ found in Python 2.3.x documentation,
+ with a small change to the `!__init__()` method to allow for pickling
+ and a default name in the form ``sHH:MM`` (``s`` is the sign.).
+
+ The implementation also caches instances. During creation, if a
+ FixedOffsetTimezone instance has previously been created with the same
+ offset and name that instance will be returned. This saves memory and
+ improves comparability.
+
+ .. versionchanged:: 2.9
+
+ The constructor can take either a timedelta or a number of minutes of
+ offset. Previously only minutes were supported.
+
+ .. __: https://docs.python.org/library/datetime.html
+ """
+ _name = None
+ _offset = ZERO
+
+ _cache = {}
+
+ def __init__(self, offset=None, name=None):
+ if offset is not None:
+ if not isinstance(offset, datetime.timedelta):
+ offset = datetime.timedelta(minutes=offset)
+ self._offset = offset
+ if name is not None:
+ self._name = name
+
+ def __new__(cls, offset=None, name=None):
+ """Return a suitable instance created earlier if it exists
+ """
+ key = (offset, name)
+ try:
+ return cls._cache[key]
+ except KeyError:
+ tz = super().__new__(cls, offset, name)
+ cls._cache[key] = tz
+ return tz
+
+ def __repr__(self):
+ return "psycopg2.tz.FixedOffsetTimezone(offset=%r, name=%r)" \
+ % (self._offset, self._name)
+
+ def __eq__(self, other):
+ if isinstance(other, FixedOffsetTimezone):
+ return self._offset == other._offset
+ else:
+ return NotImplemented
+
+ def __ne__(self, other):
+ if isinstance(other, FixedOffsetTimezone):
+ return self._offset != other._offset
+ else:
+ return NotImplemented
+
+ def __getinitargs__(self):
+ return self._offset, self._name
+
+ def utcoffset(self, dt):
+ return self._offset
+
+ def tzname(self, dt):
+ if self._name is not None:
+ return self._name
+
+ minutes, seconds = divmod(self._offset.total_seconds(), 60)
+ hours, minutes = divmod(minutes, 60)
+ rv = "%+03d" % hours
+ if minutes or seconds:
+ rv += ":%02d" % minutes
+ if seconds:
+ rv += ":%02d" % seconds
+
+ return rv
+
+ def dst(self, dt):
+ return ZERO
+
+
+STDOFFSET = datetime.timedelta(seconds=-time.timezone)
+if time.daylight:
+ DSTOFFSET = datetime.timedelta(seconds=-time.altzone)
+else:
+ DSTOFFSET = STDOFFSET
+DSTDIFF = DSTOFFSET - STDOFFSET
+
+
+class LocalTimezone(datetime.tzinfo):
+ """Platform idea of local timezone.
+
+ This is the exact implementation from the Python 2.3 documentation.
+ """
+ def utcoffset(self, dt):
+ if self._isdst(dt):
+ return DSTOFFSET
+ else:
+ return STDOFFSET
+
+ def dst(self, dt):
+ if self._isdst(dt):
+ return DSTDIFF
+ else:
+ return ZERO
+
+ def tzname(self, dt):
+ return time.tzname[self._isdst(dt)]
+
+ def _isdst(self, dt):
+ tt = (dt.year, dt.month, dt.day,
+ dt.hour, dt.minute, dt.second,
+ dt.weekday(), 0, -1)
+ stamp = time.mktime(tt)
+ tt = time.localtime(stamp)
+ return tt.tm_isdst > 0
+
+
+LOCAL = LocalTimezone()
+
+# TODO: pre-generate some interesting time zones?