| 1 | """ |
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| 2 | Copyright (c) 2003-2005 Gustavo Niemeyer <gustavo@niemeyer.net> |
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| 3 | |
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| 4 | This module offers extensions to the standard python 2.3+ |
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| 5 | datetime module. |
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| 6 | """ |
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| 7 | __author__ = "Gustavo Niemeyer <gustavo@niemeyer.net>" |
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| 8 | __license__ = "PSF License" |
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| 9 | |
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| 10 | import datetime |
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| 11 | import struct |
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| 12 | import time |
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| 13 | import sys |
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| 14 | import os |
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| 15 | |
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| 16 | relativedelta = None |
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| 17 | parser = None |
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| 18 | rrule = None |
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| 19 | |
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| 20 | __all__ = ["tzutc", "tzoffset", "tzlocal", "tzfile", "tzrange", |
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| 21 | "tzstr", "tzical", "tzwin", "tzwinlocal", "gettz"] |
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| 22 | |
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| 23 | try: |
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| 24 | from dateutil.tzwin import tzwin, tzwinlocal |
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| 25 | except (ImportError, OSError): |
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| 26 | tzwin, tzwinlocal = None, None |
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| 27 | |
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| 28 | ZERO = datetime.timedelta(0) |
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| 29 | EPOCHORDINAL = datetime.datetime.utcfromtimestamp(0).toordinal() |
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| 30 | |
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| 31 | class tzutc(datetime.tzinfo): |
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| 32 | |
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| 33 | def utcoffset(self, dt): |
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| 34 | return ZERO |
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| 35 | |
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| 36 | def dst(self, dt): |
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| 37 | return ZERO |
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| 38 | |
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| 39 | def tzname(self, dt): |
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| 40 | return "UTC" |
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| 41 | |
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| 42 | def __eq__(self, other): |
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| 43 | return (isinstance(other, tzutc) or |
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| 44 | (isinstance(other, tzoffset) and other._offset == ZERO)) |
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| 45 | |
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| 46 | def __ne__(self, other): |
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| 47 | return not self.__eq__(other) |
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| 48 | |
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| 49 | def __repr__(self): |
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| 50 | return "%s()" % self.__class__.__name__ |
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| 51 | |
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| 52 | __reduce__ = object.__reduce__ |
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| 53 | |
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| 54 | class tzoffset(datetime.tzinfo): |
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| 55 | |
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| 56 | def __init__(self, name, offset): |
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| 57 | self._name = name |
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| 58 | self._offset = datetime.timedelta(seconds=offset) |
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| 59 | |
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| 60 | def utcoffset(self, dt): |
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| 61 | return self._offset |
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| 62 | |
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| 63 | def dst(self, dt): |
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| 64 | return ZERO |
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| 65 | |
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| 66 | def tzname(self, dt): |
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| 67 | return self._name |
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| 68 | |
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| 69 | def __eq__(self, other): |
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| 70 | return (isinstance(other, tzoffset) and |
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| 71 | self._offset == other._offset) |
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| 72 | |
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| 73 | def __ne__(self, other): |
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| 74 | return not self.__eq__(other) |
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| 75 | |
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| 76 | def __repr__(self): |
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| 77 | return "%s(%s, %s)" % (self.__class__.__name__, |
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| 78 | `self._name`, |
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| 79 | self._offset.days*86400+self._offset.seconds) |
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| 80 | |
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| 81 | __reduce__ = object.__reduce__ |
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| 82 | |
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| 83 | class tzlocal(datetime.tzinfo): |
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| 84 | |
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| 85 | _std_offset = datetime.timedelta(seconds=-time.timezone) |
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| 86 | if time.daylight: |
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| 87 | _dst_offset = datetime.timedelta(seconds=-time.altzone) |
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| 88 | else: |
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| 89 | _dst_offset = _std_offset |
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| 90 | |
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| 91 | def utcoffset(self, dt): |
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| 92 | if self._isdst(dt): |
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| 93 | return self._dst_offset |
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| 94 | else: |
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| 95 | return self._std_offset |
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| 96 | |
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| 97 | def dst(self, dt): |
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| 98 | if self._isdst(dt): |
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| 99 | return self._dst_offset-self._std_offset |
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| 100 | else: |
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| 101 | return ZERO |
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| 102 | |
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| 103 | def tzname(self, dt): |
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| 104 | return time.tzname[self._isdst(dt)] |
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| 105 | |
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| 106 | def _isdst(self, dt): |
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| 107 | # We can't use mktime here. It is unstable when deciding if |
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| 108 | # the hour near to a change is DST or not. |
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| 109 | # |
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| 110 | # timestamp = time.mktime((dt.year, dt.month, dt.day, dt.hour, |
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| 111 | # dt.minute, dt.second, dt.weekday(), 0, -1)) |
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| 112 | # return time.localtime(timestamp).tm_isdst |
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| 113 | # |
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| 114 | # The code above yields the following result: |
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| 115 | # |
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| 116 | #>>> import tz, datetime |
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| 117 | #>>> t = tz.tzlocal() |
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| 118 | #>>> datetime.datetime(2003,2,15,23,tzinfo=t).tzname() |
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| 119 | #'BRDT' |
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| 120 | #>>> datetime.datetime(2003,2,16,0,tzinfo=t).tzname() |
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| 121 | #'BRST' |
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| 122 | #>>> datetime.datetime(2003,2,15,23,tzinfo=t).tzname() |
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| 123 | #'BRST' |
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| 124 | #>>> datetime.datetime(2003,2,15,22,tzinfo=t).tzname() |
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| 125 | #'BRDT' |
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| 126 | #>>> datetime.datetime(2003,2,15,23,tzinfo=t).tzname() |
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| 127 | #'BRDT' |
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| 128 | # |
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| 129 | # Here is a more stable implementation: |
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| 130 | # |
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| 131 | timestamp = ((dt.toordinal() - EPOCHORDINAL) * 86400 |
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| 132 | + dt.hour * 3600 |
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| 133 | + dt.minute * 60 |
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| 134 | + dt.second) |
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| 135 | return time.localtime(timestamp+time.timezone).tm_isdst |
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| 136 | |
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| 137 | def __eq__(self, other): |
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| 138 | if not isinstance(other, tzlocal): |
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| 139 | return False |
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| 140 | return (self._std_offset == other._std_offset and |
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| 141 | self._dst_offset == other._dst_offset) |
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| 142 | return True |
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| 143 | |
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| 144 | def __ne__(self, other): |
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| 145 | return not self.__eq__(other) |
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| 146 | |
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| 147 | def __repr__(self): |
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| 148 | return "%s()" % self.__class__.__name__ |
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| 149 | |
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| 150 | __reduce__ = object.__reduce__ |
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| 151 | |
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| 152 | class _ttinfo(object): |
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| 153 | __slots__ = ["offset", "delta", "isdst", "abbr", "isstd", "isgmt"] |
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| 154 | |
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| 155 | def __init__(self): |
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| 156 | for attr in self.__slots__: |
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| 157 | setattr(self, attr, None) |
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| 158 | |
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| 159 | def __repr__(self): |
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| 160 | l = [] |
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| 161 | for attr in self.__slots__: |
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| 162 | value = getattr(self, attr) |
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| 163 | if value is not None: |
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| 164 | l.append("%s=%s" % (attr, `value`)) |
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| 165 | return "%s(%s)" % (self.__class__.__name__, ", ".join(l)) |
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| 166 | |
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| 167 | def __eq__(self, other): |
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| 168 | if not isinstance(other, _ttinfo): |
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| 169 | return False |
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| 170 | return (self.offset == other.offset and |
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| 171 | self.delta == other.delta and |
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| 172 | self.isdst == other.isdst and |
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| 173 | self.abbr == other.abbr and |
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| 174 | self.isstd == other.isstd and |
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| 175 | self.isgmt == other.isgmt) |
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| 176 | |
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| 177 | def __ne__(self, other): |
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| 178 | return not self.__eq__(other) |
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| 179 | |
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| 180 | def __getstate__(self): |
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| 181 | state = {} |
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| 182 | for name in self.__slots__: |
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| 183 | state[name] = getattr(self, name, None) |
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| 184 | return state |
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| 185 | |
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| 186 | def __setstate__(self, state): |
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| 187 | for name in self.__slots__: |
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| 188 | if name in state: |
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| 189 | setattr(self, name, state[name]) |
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| 190 | |
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| 191 | class tzfile(datetime.tzinfo): |
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| 192 | |
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| 193 | # http://www.twinsun.com/tz/tz-link.htm |
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| 194 | # ftp://elsie.nci.nih.gov/pub/tz*.tar.gz |
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| 195 | |
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| 196 | def __init__(self, fileobj): |
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| 197 | if isinstance(fileobj, basestring): |
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| 198 | self._filename = fileobj |
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| 199 | fileobj = open(fileobj) |
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| 200 | elif hasattr(fileobj, "name"): |
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| 201 | self._filename = fileobj.name |
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| 202 | else: |
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| 203 | self._filename = `fileobj` |
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| 204 | |
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| 205 | # From tzfile(5): |
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| 206 | # |
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| 207 | # The time zone information files used by tzset(3) |
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| 208 | # begin with the magic characters "TZif" to identify |
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| 209 | # them as time zone information files, followed by |
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| 210 | # sixteen bytes reserved for future use, followed by |
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| 211 | # six four-byte values of type long, written in a |
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| 212 | # ``standard'' byte order (the high-order byte |
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| 213 | # of the value is written first). |
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| 214 | |
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| 215 | if fileobj.read(4) != "TZif": |
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| 216 | raise ValueError, "magic not found" |
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| 217 | |
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| 218 | fileobj.read(16) |
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| 219 | |
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| 220 | ( |
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| 221 | # The number of UTC/local indicators stored in the file. |
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| 222 | ttisgmtcnt, |
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| 223 | |
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| 224 | # The number of standard/wall indicators stored in the file. |
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| 225 | ttisstdcnt, |
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| 226 | |
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| 227 | # The number of leap seconds for which data is |
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| 228 | # stored in the file. |
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| 229 | leapcnt, |
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| 230 | |
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| 231 | # The number of "transition times" for which data |
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| 232 | # is stored in the file. |
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| 233 | timecnt, |
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| 234 | |
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| 235 | # The number of "local time types" for which data |
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| 236 | # is stored in the file (must not be zero). |
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| 237 | typecnt, |
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| 238 | |
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| 239 | # The number of characters of "time zone |
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| 240 | # abbreviation strings" stored in the file. |
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| 241 | charcnt, |
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| 242 | |
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| 243 | ) = struct.unpack(">6l", fileobj.read(24)) |
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| 244 | |
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| 245 | # The above header is followed by tzh_timecnt four-byte |
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| 246 | # values of type long, sorted in ascending order. |
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| 247 | # These values are written in ``standard'' byte order. |
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| 248 | # Each is used as a transition time (as returned by |
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| 249 | # time(2)) at which the rules for computing local time |
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| 250 | # change. |
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| 251 | |
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| 252 | if timecnt: |
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| 253 | self._trans_list = struct.unpack(">%dl" % timecnt, |
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| 254 | fileobj.read(timecnt*4)) |
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| 255 | else: |
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| 256 | self._trans_list = [] |
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| 257 | |
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| 258 | # Next come tzh_timecnt one-byte values of type unsigned |
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| 259 | # char; each one tells which of the different types of |
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| 260 | # ``local time'' types described in the file is associated |
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| 261 | # with the same-indexed transition time. These values |
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| 262 | # serve as indices into an array of ttinfo structures that |
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| 263 | # appears next in the file. |
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| 264 | |
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| 265 | if timecnt: |
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| 266 | self._trans_idx = struct.unpack(">%dB" % timecnt, |
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| 267 | fileobj.read(timecnt)) |
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| 268 | else: |
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| 269 | self._trans_idx = [] |
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| 270 | |
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| 271 | # Each ttinfo structure is written as a four-byte value |
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| 272 | # for tt_gmtoff of type long, in a standard byte |
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| 273 | # order, followed by a one-byte value for tt_isdst |
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| 274 | # and a one-byte value for tt_abbrind. In each |
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| 275 | # structure, tt_gmtoff gives the number of |
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| 276 | # seconds to be added to UTC, tt_isdst tells whether |
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| 277 | # tm_isdst should be set by localtime(3), and |
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| 278 | # tt_abbrind serves as an index into the array of |
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| 279 | # time zone abbreviation characters that follow the |
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| 280 | # ttinfo structure(s) in the file. |
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| 281 | |
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| 282 | ttinfo = [] |
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| 283 | |
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| 284 | for i in range(typecnt): |
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| 285 | ttinfo.append(struct.unpack(">lbb", fileobj.read(6))) |
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| 286 | |
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| 287 | abbr = fileobj.read(charcnt) |
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| 288 | |
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| 289 | # Then there are tzh_leapcnt pairs of four-byte |
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| 290 | # values, written in standard byte order; the |
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| 291 | # first value of each pair gives the time (as |
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| 292 | # returned by time(2)) at which a leap second |
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| 293 | # occurs; the second gives the total number of |
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| 294 | # leap seconds to be applied after the given time. |
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| 295 | # The pairs of values are sorted in ascending order |
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| 296 | # by time. |
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| 297 | |
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| 298 | # Not used, for now |
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| 299 | if leapcnt: |
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| 300 | leap = struct.unpack(">%dl" % (leapcnt*2), |
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| 301 | fileobj.read(leapcnt*8)) |
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| 302 | |
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| 303 | # Then there are tzh_ttisstdcnt standard/wall |
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| 304 | # indicators, each stored as a one-byte value; |
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| 305 | # they tell whether the transition times associated |
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| 306 | # with local time types were specified as standard |
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| 307 | # time or wall clock time, and are used when |
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| 308 | # a time zone file is used in handling POSIX-style |
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| 309 | # time zone environment variables. |
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| 310 | |
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| 311 | if ttisstdcnt: |
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| 312 | isstd = struct.unpack(">%db" % ttisstdcnt, |
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| 313 | fileobj.read(ttisstdcnt)) |
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| 314 | |
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| 315 | # Finally, there are tzh_ttisgmtcnt UTC/local |
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| 316 | # indicators, each stored as a one-byte value; |
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| 317 | # they tell whether the transition times associated |
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| 318 | # with local time types were specified as UTC or |
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| 319 | # local time, and are used when a time zone file |
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| 320 | # is used in handling POSIX-style time zone envi- |
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| 321 | # ronment variables. |
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| 322 | |
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| 323 | if ttisgmtcnt: |
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| 324 | isgmt = struct.unpack(">%db" % ttisgmtcnt, |
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| 325 | fileobj.read(ttisgmtcnt)) |
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| 326 | |
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| 327 | # ** Everything has been read ** |
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| 328 | |
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| 329 | # Build ttinfo list |
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| 330 | self._ttinfo_list = [] |
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| 331 | for i in range(typecnt): |
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| 332 | gmtoff, isdst, abbrind = ttinfo[i] |
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| 333 | # Round to full-minutes if that's not the case. Python's |
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| 334 | # datetime doesn't accept sub-minute timezones. Check |
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| 335 | # http://python.org/sf/1447945 for some information. |
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| 336 | gmtoff = (gmtoff+30)//60*60 |
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| 337 | tti = _ttinfo() |
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| 338 | tti.offset = gmtoff |
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| 339 | tti.delta = datetime.timedelta(seconds=gmtoff) |
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| 340 | tti.isdst = isdst |
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| 341 | tti.abbr = abbr[abbrind:abbr.find('\x00', abbrind)] |
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| 342 | tti.isstd = (ttisstdcnt > i and isstd[i] != 0) |
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| 343 | tti.isgmt = (ttisgmtcnt > i and isgmt[i] != 0) |
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| 344 | self._ttinfo_list.append(tti) |
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| 345 | |
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| 346 | # Replace ttinfo indexes for ttinfo objects. |
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| 347 | trans_idx = [] |
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| 348 | for idx in self._trans_idx: |
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| 349 | trans_idx.append(self._ttinfo_list[idx]) |
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| 350 | self._trans_idx = tuple(trans_idx) |
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| 351 | |
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| 352 | # Set standard, dst, and before ttinfos. before will be |
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| 353 | # used when a given time is before any transitions, |
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| 354 | # and will be set to the first non-dst ttinfo, or to |
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| 355 | # the first dst, if all of them are dst. |
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| 356 | self._ttinfo_std = None |
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| 357 | self._ttinfo_dst = None |
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| 358 | self._ttinfo_before = None |
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| 359 | if self._ttinfo_list: |
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| 360 | if not self._trans_list: |
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| 361 | self._ttinfo_std = self._ttinfo_first = self._ttinfo_list[0] |
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| 362 | else: |
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| 363 | for i in range(timecnt-1,-1,-1): |
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| 364 | tti = self._trans_idx[i] |
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| 365 | if not self._ttinfo_std and not tti.isdst: |
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| 366 | self._ttinfo_std = tti |
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| 367 | elif not self._ttinfo_dst and tti.isdst: |
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| 368 | self._ttinfo_dst = tti |
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| 369 | if self._ttinfo_std and self._ttinfo_dst: |
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| 370 | break |
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| 371 | else: |
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| 372 | if self._ttinfo_dst and not self._ttinfo_std: |
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| 373 | self._ttinfo_std = self._ttinfo_dst |
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| 374 | |
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| 375 | for tti in self._ttinfo_list: |
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| 376 | if not tti.isdst: |
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| 377 | self._ttinfo_before = tti |
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| 378 | break |
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| 379 | else: |
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| 380 | self._ttinfo_before = self._ttinfo_list[0] |
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| 381 | |
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| 382 | # Now fix transition times to become relative to wall time. |
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| 383 | # |
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| 384 | # I'm not sure about this. In my tests, the tz source file |
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| 385 | # is setup to wall time, and in the binary file isstd and |
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| 386 | # isgmt are off, so it should be in wall time. OTOH, it's |
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| 387 | # always in gmt time. Let me know if you have comments |
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| 388 | # about this. |
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| 389 | laststdoffset = 0 |
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| 390 | self._trans_list = list(self._trans_list) |
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| 391 | for i in range(len(self._trans_list)): |
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| 392 | tti = self._trans_idx[i] |
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| 393 | if not tti.isdst: |
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| 394 | # This is std time. |
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| 395 | self._trans_list[i] += tti.offset |
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| 396 | laststdoffset = tti.offset |
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| 397 | else: |
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| 398 | # This is dst time. Convert to std. |
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| 399 | self._trans_list[i] += laststdoffset |
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| 400 | self._trans_list = tuple(self._trans_list) |
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| 401 | |
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| 402 | def _find_ttinfo(self, dt, laststd=0): |
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| 403 | timestamp = ((dt.toordinal() - EPOCHORDINAL) * 86400 |
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| 404 | + dt.hour * 3600 |
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| 405 | + dt.minute * 60 |
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| 406 | + dt.second) |
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| 407 | idx = 0 |
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| 408 | for trans in self._trans_list: |
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| 409 | if timestamp < trans: |
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| 410 | break |
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| 411 | idx += 1 |
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| 412 | else: |
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| 413 | return self._ttinfo_std |
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| 414 | if idx == 0: |
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| 415 | return self._ttinfo_before |
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| 416 | if laststd: |
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| 417 | while idx > 0: |
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| 418 | tti = self._trans_idx[idx-1] |
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| 419 | if not tti.isdst: |
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| 420 | return tti |
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| 421 | idx -= 1 |
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| 422 | else: |
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| 423 | return self._ttinfo_std |
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| 424 | else: |
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| 425 | return self._trans_idx[idx-1] |
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| 426 | |
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| 427 | def utcoffset(self, dt): |
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| 428 | if not self._ttinfo_std: |
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| 429 | return ZERO |
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| 430 | return self._find_ttinfo(dt).delta |
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| 431 | |
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| 432 | def dst(self, dt): |
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| 433 | if not self._ttinfo_dst: |
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| 434 | return ZERO |
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| 435 | tti = self._find_ttinfo(dt) |
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| 436 | if not tti.isdst: |
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| 437 | return ZERO |
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| 438 | |
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| 439 | # The documentation says that utcoffset()-dst() must |
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| 440 | # be constant for every dt. |
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| 441 | return self._find_ttinfo(dt, laststd=1).delta-tti.delta |
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| 442 | |
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| 443 | # An alternative for that would be: |
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| 444 | # |
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| 445 | # return self._ttinfo_dst.offset-self._ttinfo_std.offset |
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| 446 | # |
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| 447 | # However, this class stores historical changes in the |
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| 448 | # dst offset, so I belive that this wouldn't be the right |
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| 449 | # way to implement this. |
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| 450 | |
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| 451 | def tzname(self, dt): |
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| 452 | if not self._ttinfo_std: |
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| 453 | return None |
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| 454 | return self._find_ttinfo(dt).abbr |
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| 455 | |
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| 456 | def __eq__(self, other): |
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| 457 | if not isinstance(other, tzfile): |
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| 458 | return False |
|---|
| 459 | return (self._trans_list == other._trans_list and |
|---|
| 460 | self._trans_idx == other._trans_idx and |
|---|
| 461 | self._ttinfo_list == other._ttinfo_list) |
|---|
| 462 | |
|---|
| 463 | def __ne__(self, other): |
|---|
| 464 | return not self.__eq__(other) |
|---|
| 465 | |
|---|
| 466 | |
|---|
| 467 | def __repr__(self): |
|---|
| 468 | return "%s(%s)" % (self.__class__.__name__, `self._filename`) |
|---|
| 469 | |
|---|
| 470 | def __reduce__(self): |
|---|
| 471 | if not os.path.isfile(self._filename): |
|---|
| 472 | raise ValueError, "Unpickable %s class" % self.__class__.__name__ |
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| 473 | return (self.__class__, (self._filename,)) |
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| 474 | |
|---|
| 475 | class tzrange(datetime.tzinfo): |
|---|
| 476 | |
|---|
| 477 | def __init__(self, stdabbr, stdoffset=None, |
|---|
| 478 | dstabbr=None, dstoffset=None, |
|---|
| 479 | start=None, end=None): |
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| 480 | global relativedelta |
|---|
| 481 | if not relativedelta: |
|---|
| 482 | from dateutil import relativedelta |
|---|
| 483 | self._std_abbr = stdabbr |
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| 484 | self._dst_abbr = dstabbr |
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| 485 | if stdoffset is not None: |
|---|
| 486 | self._std_offset = datetime.timedelta(seconds=stdoffset) |
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| 487 | else: |
|---|
| 488 | self._std_offset = ZERO |
|---|
| 489 | if dstoffset is not None: |
|---|
| 490 | self._dst_offset = datetime.timedelta(seconds=dstoffset) |
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| 491 | elif dstabbr and stdoffset is not None: |
|---|
| 492 | self._dst_offset = self._std_offset+datetime.timedelta(hours=+1) |
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| 493 | else: |
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| 494 | self._dst_offset = ZERO |
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| 495 | if start is None: |
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| 496 | self._start_delta = relativedelta.relativedelta( |
|---|
| 497 | hours=+2, month=4, day=1, weekday=relativedelta.SU(+1)) |
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| 498 | else: |
|---|
| 499 | self._start_delta = start |
|---|
| 500 | if end is None: |
|---|
| 501 | self._end_delta = relativedelta.relativedelta( |
|---|
| 502 | hours=+1, month=10, day=31, weekday=relativedelta.SU(-1)) |
|---|
| 503 | else: |
|---|
| 504 | self._end_delta = end |
|---|
| 505 | |
|---|
| 506 | def utcoffset(self, dt): |
|---|
| 507 | if self._isdst(dt): |
|---|
| 508 | return self._dst_offset |
|---|
| 509 | else: |
|---|
| 510 | return self._std_offset |
|---|
| 511 | |
|---|
| 512 | def dst(self, dt): |
|---|
| 513 | if self._isdst(dt): |
|---|
| 514 | return self._dst_offset-self._std_offset |
|---|
| 515 | else: |
|---|
| 516 | return ZERO |
|---|
| 517 | |
|---|
| 518 | def tzname(self, dt): |
|---|
| 519 | if self._isdst(dt): |
|---|
| 520 | return self._dst_abbr |
|---|
| 521 | else: |
|---|
| 522 | return self._std_abbr |
|---|
| 523 | |
|---|
| 524 | def _isdst(self, dt): |
|---|
| 525 | if not self._start_delta: |
|---|
| 526 | return False |
|---|
| 527 | year = datetime.date(dt.year,1,1) |
|---|
| 528 | start = year+self._start_delta |
|---|
| 529 | end = year+self._end_delta |
|---|
| 530 | dt = dt.replace(tzinfo=None) |
|---|
| 531 | if start < end: |
|---|
| 532 | return dt >= start and dt < end |
|---|
| 533 | else: |
|---|
| 534 | return dt >= start or dt < end |
|---|
| 535 | |
|---|
| 536 | def __eq__(self, other): |
|---|
| 537 | if not isinstance(other, tzrange): |
|---|
| 538 | return False |
|---|
| 539 | return (self._std_abbr == other._std_abbr and |
|---|
| 540 | self._dst_abbr == other._dst_abbr and |
|---|
| 541 | self._std_offset == other._std_offset and |
|---|
| 542 | self._dst_offset == other._dst_offset and |
|---|
| 543 | self._start_delta == other._start_delta and |
|---|
| 544 | self._end_delta == other._end_delta) |
|---|
| 545 | |
|---|
| 546 | def __ne__(self, other): |
|---|
| 547 | return not self.__eq__(other) |
|---|
| 548 | |
|---|
| 549 | def __repr__(self): |
|---|
| 550 | return "%s(...)" % self.__class__.__name__ |
|---|
| 551 | |
|---|
| 552 | __reduce__ = object.__reduce__ |
|---|
| 553 | |
|---|
| 554 | class tzstr(tzrange): |
|---|
| 555 | |
|---|
| 556 | def __init__(self, s): |
|---|
| 557 | global parser |
|---|
| 558 | if not parser: |
|---|
| 559 | from dateutil import parser |
|---|
| 560 | self._s = s |
|---|
| 561 | |
|---|
| 562 | res = parser._parsetz(s) |
|---|
| 563 | if res is None: |
|---|
| 564 | raise ValueError, "unknown string format" |
|---|
| 565 | |
|---|
| 566 | # We must initialize it first, since _delta() needs |
|---|
| 567 | # _std_offset and _dst_offset set. Use False in start/end |
|---|
| 568 | # to avoid building it two times. |
|---|
| 569 | tzrange.__init__(self, res.stdabbr, res.stdoffset, |
|---|
| 570 | res.dstabbr, res.dstoffset, |
|---|
| 571 | start=False, end=False) |
|---|
| 572 | |
|---|
| 573 | self._start_delta = self._delta(res.start) |
|---|
| 574 | if self._start_delta: |
|---|
| 575 | self._end_delta = self._delta(res.end, isend=1) |
|---|
| 576 | |
|---|
| 577 | def _delta(self, x, isend=0): |
|---|
| 578 | kwargs = {} |
|---|
| 579 | if x.month is not None: |
|---|
| 580 | kwargs["month"] = x.month |
|---|
| 581 | if x.weekday is not None: |
|---|
| 582 | kwargs["weekday"] = relativedelta.weekday(x.weekday, x.week) |
|---|
| 583 | if x.week > 0: |
|---|
| 584 | kwargs["day"] = 1 |
|---|
| 585 | else: |
|---|
| 586 | kwargs["day"] = 31 |
|---|
| 587 | elif x.day: |
|---|
| 588 | kwargs["day"] = x.day |
|---|
| 589 | elif x.yday is not None: |
|---|
| 590 | kwargs["yearday"] = x.yday |
|---|
| 591 | elif x.jyday is not None: |
|---|
| 592 | kwargs["nlyearday"] = x.jyday |
|---|
| 593 | if not kwargs: |
|---|
| 594 | # Default is to start on first sunday of april, and end |
|---|
| 595 | # on last sunday of october. |
|---|
| 596 | if not isend: |
|---|
| 597 | kwargs["month"] = 4 |
|---|
| 598 | kwargs["day"] = 1 |
|---|
| 599 | kwargs["weekday"] = relativedelta.SU(+1) |
|---|
| 600 | else: |
|---|
| 601 | kwargs["month"] = 10 |
|---|
| 602 | kwargs["day"] = 31 |
|---|
| 603 | kwargs["weekday"] = relativedelta.SU(-1) |
|---|
| 604 | if x.time is not None: |
|---|
| 605 | kwargs["seconds"] = x.time |
|---|
| 606 | else: |
|---|
| 607 | # Default is 2AM. |
|---|
| 608 | kwargs["seconds"] = 7200 |
|---|
| 609 | if isend: |
|---|
| 610 | # Convert to standard time, to follow the documented way |
|---|
| 611 | # of working with the extra hour. See the documentation |
|---|
| 612 | # of the tzinfo class. |
|---|
| 613 | delta = self._dst_offset-self._std_offset |
|---|
| 614 | kwargs["seconds"] -= delta.seconds+delta.days*86400 |
|---|
| 615 | return relativedelta.relativedelta(**kwargs) |
|---|
| 616 | |
|---|
| 617 | def __repr__(self): |
|---|
| 618 | return "%s(%s)" % (self.__class__.__name__, `self._s`) |
|---|
| 619 | |
|---|
| 620 | class _tzicalvtzcomp: |
|---|
| 621 | def __init__(self, tzoffsetfrom, tzoffsetto, isdst, |
|---|
| 622 | tzname=None, rrule=None): |
|---|
| 623 | self.tzoffsetfrom = datetime.timedelta(seconds=tzoffsetfrom) |
|---|
| 624 | self.tzoffsetto = datetime.timedelta(seconds=tzoffsetto) |
|---|
| 625 | self.tzoffsetdiff = self.tzoffsetto-self.tzoffsetfrom |
|---|
| 626 | self.isdst = isdst |
|---|
| 627 | self.tzname = tzname |
|---|
| 628 | self.rrule = rrule |
|---|
| 629 | |
|---|
| 630 | class _tzicalvtz(datetime.tzinfo): |
|---|
| 631 | def __init__(self, tzid, comps=[]): |
|---|
| 632 | self._tzid = tzid |
|---|
| 633 | self._comps = comps |
|---|
| 634 | self._cachedate = [] |
|---|
| 635 | self._cachecomp = [] |
|---|
| 636 | |
|---|
| 637 | def _find_comp(self, dt): |
|---|
| 638 | if len(self._comps) == 1: |
|---|
| 639 | return self._comps[0] |
|---|
| 640 | dt = dt.replace(tzinfo=None) |
|---|
| 641 | try: |
|---|
| 642 | return self._cachecomp[self._cachedate.index(dt)] |
|---|
| 643 | except ValueError: |
|---|
| 644 | pass |
|---|
| 645 | lastcomp = None |
|---|
| 646 | lastcompdt = None |
|---|
| 647 | for comp in self._comps: |
|---|
| 648 | if not comp.isdst: |
|---|
| 649 | # Handle the extra hour in DST -> STD |
|---|
| 650 | compdt = comp.rrule.before(dt-comp.tzoffsetdiff, inc=True) |
|---|
| 651 | else: |
|---|
| 652 | compdt = comp.rrule.before(dt, inc=True) |
|---|
| 653 | if compdt and (not lastcompdt or lastcompdt < compdt): |
|---|
| 654 | lastcompdt = compdt |
|---|
| 655 | lastcomp = comp |
|---|
| 656 | if not lastcomp: |
|---|
| 657 | # RFC says nothing about what to do when a given |
|---|
| 658 | # time is before the first onset date. We'll look for the |
|---|
| 659 | # first standard component, or the first component, if |
|---|
| 660 | # none is found. |
|---|
| 661 | for comp in self._comps: |
|---|
| 662 | if not comp.isdst: |
|---|
| 663 | lastcomp = comp |
|---|
| 664 | break |
|---|
| 665 | else: |
|---|
| 666 | lastcomp = comp[0] |
|---|
| 667 | self._cachedate.insert(0, dt) |
|---|
| 668 | self._cachecomp.insert(0, lastcomp) |
|---|
| 669 | if len(self._cachedate) > 10: |
|---|
| 670 | self._cachedate.pop() |
|---|
| 671 | self._cachecomp.pop() |
|---|
| 672 | return lastcomp |
|---|
| 673 | |
|---|
| 674 | def utcoffset(self, dt): |
|---|
| 675 | return self._find_comp(dt).tzoffsetto |
|---|
| 676 | |
|---|
| 677 | def dst(self, dt): |
|---|
| 678 | comp = self._find_comp(dt) |
|---|
| 679 | if comp.isdst: |
|---|
| 680 | return comp.tzoffsetdiff |
|---|
| 681 | else: |
|---|
| 682 | return ZERO |
|---|
| 683 | |
|---|
| 684 | def tzname(self, dt): |
|---|
| 685 | return self._find_comp(dt).tzname |
|---|
| 686 | |
|---|
| 687 | def __repr__(self): |
|---|
| 688 | return "<tzicalvtz %s>" % `self._tzid` |
|---|
| 689 | |
|---|
| 690 | __reduce__ = object.__reduce__ |
|---|
| 691 | |
|---|
| 692 | class tzical: |
|---|
| 693 | def __init__(self, fileobj): |
|---|
| 694 | global rrule |
|---|
| 695 | if not rrule: |
|---|
| 696 | from dateutil import rrule |
|---|
| 697 | |
|---|
| 698 | if isinstance(fileobj, basestring): |
|---|
| 699 | self._s = fileobj |
|---|
| 700 | fileobj = open(fileobj) |
|---|
| 701 | elif hasattr(fileobj, "name"): |
|---|
| 702 | self._s = fileobj.name |
|---|
| 703 | else: |
|---|
| 704 | self._s = `fileobj` |
|---|
| 705 | |
|---|
| 706 | self._vtz = {} |
|---|
| 707 | |
|---|
| 708 | self._parse_rfc(fileobj.read()) |
|---|
| 709 | |
|---|
| 710 | def keys(self): |
|---|
| 711 | return self._vtz.keys() |
|---|
| 712 | |
|---|
| 713 | def get(self, tzid=None): |
|---|
| 714 | if tzid is None: |
|---|
| 715 | keys = self._vtz.keys() |
|---|
| 716 | if len(keys) == 0: |
|---|
|