# 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(minutes=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(name,offsetmins) _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})? (?P<time> (?: # 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 ['time', 'ymdsep', 'hmssep', 'tzempty']: vals[key] = int(vals[key]) year = vals['year'] month = vals['month'] day = vals['day'] if m.group('time') is None: return datetime.date(year, month, 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)