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Diffstat (limited to 'Windows/dateutil/tz/win.py')
| -rw-r--r-- | Windows/dateutil/tz/win.py | 370 |
1 files changed, 0 insertions, 370 deletions
diff --git a/Windows/dateutil/tz/win.py b/Windows/dateutil/tz/win.py deleted file mode 100644 index cde07ba7..00000000 --- a/Windows/dateutil/tz/win.py +++ /dev/null @@ -1,370 +0,0 @@ -# -*- coding: utf-8 -*- -""" -This module provides an interface to the native time zone data on Windows, -including :py:class:`datetime.tzinfo` implementations. - -Attempting to import this module on a non-Windows platform will raise an -:py:obj:`ImportError`. -""" -# This code was originally contributed by Jeffrey Harris. -import datetime -import struct - -from six.moves import winreg -from six import text_type - -try: - import ctypes - from ctypes import wintypes -except ValueError: - # ValueError is raised on non-Windows systems for some horrible reason. - raise ImportError("Running tzwin on non-Windows system") - -from ._common import tzrangebase - -__all__ = ["tzwin", "tzwinlocal", "tzres"] - -ONEWEEK = datetime.timedelta(7) - -TZKEYNAMENT = r"SOFTWARE\Microsoft\Windows NT\CurrentVersion\Time Zones" -TZKEYNAME9X = r"SOFTWARE\Microsoft\Windows\CurrentVersion\Time Zones" -TZLOCALKEYNAME = r"SYSTEM\CurrentControlSet\Control\TimeZoneInformation" - - -def _settzkeyname(): - handle = winreg.ConnectRegistry(None, winreg.HKEY_LOCAL_MACHINE) - try: - winreg.OpenKey(handle, TZKEYNAMENT).Close() - TZKEYNAME = TZKEYNAMENT - except WindowsError: - TZKEYNAME = TZKEYNAME9X - handle.Close() - return TZKEYNAME - - -TZKEYNAME = _settzkeyname() - - -class tzres(object): - """ - Class for accessing ``tzres.dll``, which contains timezone name related - resources. - - .. versionadded:: 2.5.0 - """ - p_wchar = ctypes.POINTER(wintypes.WCHAR) # Pointer to a wide char - - def __init__(self, tzres_loc='tzres.dll'): - # Load the user32 DLL so we can load strings from tzres - user32 = ctypes.WinDLL('user32') - - # Specify the LoadStringW function - user32.LoadStringW.argtypes = (wintypes.HINSTANCE, - wintypes.UINT, - wintypes.LPWSTR, - ctypes.c_int) - - self.LoadStringW = user32.LoadStringW - self._tzres = ctypes.WinDLL(tzres_loc) - self.tzres_loc = tzres_loc - - def load_name(self, offset): - """ - Load a timezone name from a DLL offset (integer). - - >>> from dateutil.tzwin import tzres - >>> tzr = tzres() - >>> print(tzr.load_name(112)) - 'Eastern Standard Time' - - :param offset: - A positive integer value referring to a string from the tzres dll. - - .. note:: - - Offsets found in the registry are generally of the form - ``@tzres.dll,-114``. The offset in this case is 114, not -114. - - """ - resource = self.p_wchar() - lpBuffer = ctypes.cast(ctypes.byref(resource), wintypes.LPWSTR) - nchar = self.LoadStringW(self._tzres._handle, offset, lpBuffer, 0) - return resource[:nchar] - - def name_from_string(self, tzname_str): - """ - Parse strings as returned from the Windows registry into the time zone - name as defined in the registry. - - >>> from dateutil.tzwin import tzres - >>> tzr = tzres() - >>> print(tzr.name_from_string('@tzres.dll,-251')) - 'Dateline Daylight Time' - >>> print(tzr.name_from_string('Eastern Standard Time')) - 'Eastern Standard Time' - - :param tzname_str: - A timezone name string as returned from a Windows registry key. - - :return: - Returns the localized timezone string from tzres.dll if the string - is of the form `@tzres.dll,-offset`, else returns the input string. - """ - if not tzname_str.startswith('@'): - return tzname_str - - name_splt = tzname_str.split(',-') - try: - offset = int(name_splt[1]) - except: - raise ValueError("Malformed timezone string.") - - return self.load_name(offset) - - -class tzwinbase(tzrangebase): - """tzinfo class based on win32's timezones available in the registry.""" - def __init__(self): - raise NotImplementedError('tzwinbase is an abstract base class') - - def __eq__(self, other): - # Compare on all relevant dimensions, including name. - if not isinstance(other, tzwinbase): - return NotImplemented - - return (self._std_offset == other._std_offset and - self._dst_offset == other._dst_offset and - self._stddayofweek == other._stddayofweek and - self._dstdayofweek == other._dstdayofweek and - self._stdweeknumber == other._stdweeknumber and - self._dstweeknumber == other._dstweeknumber and - self._stdhour == other._stdhour and - self._dsthour == other._dsthour and - self._stdminute == other._stdminute and - self._dstminute == other._dstminute and - self._std_abbr == other._std_abbr and - self._dst_abbr == other._dst_abbr) - - @staticmethod - def list(): - """Return a list of all time zones known to the system.""" - with winreg.ConnectRegistry(None, winreg.HKEY_LOCAL_MACHINE) as handle: - with winreg.OpenKey(handle, TZKEYNAME) as tzkey: - result = [winreg.EnumKey(tzkey, i) - for i in range(winreg.QueryInfoKey(tzkey)[0])] - return result - - def display(self): - """ - Return the display name of the time zone. - """ - return self._display - - def transitions(self, year): - """ - For a given year, get the DST on and off transition times, expressed - always on the standard time side. For zones with no transitions, this - function returns ``None``. - - :param year: - The year whose transitions you would like to query. - - :return: - Returns a :class:`tuple` of :class:`datetime.datetime` objects, - ``(dston, dstoff)`` for zones with an annual DST transition, or - ``None`` for fixed offset zones. - """ - - if not self.hasdst: - return None - - dston = picknthweekday(year, self._dstmonth, self._dstdayofweek, - self._dsthour, self._dstminute, - self._dstweeknumber) - - dstoff = picknthweekday(year, self._stdmonth, self._stddayofweek, - self._stdhour, self._stdminute, - self._stdweeknumber) - - # Ambiguous dates default to the STD side - dstoff -= self._dst_base_offset - - return dston, dstoff - - def _get_hasdst(self): - return self._dstmonth != 0 - - @property - def _dst_base_offset(self): - return self._dst_base_offset_ - - -class tzwin(tzwinbase): - """ - Time zone object created from the zone info in the Windows registry - - These are similar to :py:class:`dateutil.tz.tzrange` objects in that - the time zone data is provided in the format of a single offset rule - for either 0 or 2 time zone transitions per year. - - :param: name - The name of a Windows time zone key, e.g. "Eastern Standard Time". - The full list of keys can be retrieved with :func:`tzwin.list`. - """ - - def __init__(self, name): - self._name = name - - with winreg.ConnectRegistry(None, winreg.HKEY_LOCAL_MACHINE) as handle: - tzkeyname = text_type("{kn}\\{name}").format(kn=TZKEYNAME, name=name) - with winreg.OpenKey(handle, tzkeyname) as tzkey: - keydict = valuestodict(tzkey) - - self._std_abbr = keydict["Std"] - self._dst_abbr = keydict["Dlt"] - - self._display = keydict["Display"] - - # See http://ww_winreg.jsiinc.com/SUBA/tip0300/rh0398.htm - tup = struct.unpack("=3l16h", keydict["TZI"]) - stdoffset = -tup[0]-tup[1] # Bias + StandardBias * -1 - dstoffset = stdoffset-tup[2] # + DaylightBias * -1 - self._std_offset = datetime.timedelta(minutes=stdoffset) - self._dst_offset = datetime.timedelta(minutes=dstoffset) - - # for the meaning see the win32 TIME_ZONE_INFORMATION structure docs - # http://msdn.microsoft.com/en-us/library/windows/desktop/ms725481(v=vs.85).aspx - (self._stdmonth, - self._stddayofweek, # Sunday = 0 - self._stdweeknumber, # Last = 5 - self._stdhour, - self._stdminute) = tup[4:9] - - (self._dstmonth, - self._dstdayofweek, # Sunday = 0 - self._dstweeknumber, # Last = 5 - self._dsthour, - self._dstminute) = tup[12:17] - - self._dst_base_offset_ = self._dst_offset - self._std_offset - self.hasdst = self._get_hasdst() - - def __repr__(self): - return "tzwin(%s)" % repr(self._name) - - def __reduce__(self): - return (self.__class__, (self._name,)) - - -class tzwinlocal(tzwinbase): - """ - Class representing the local time zone information in the Windows registry - - While :class:`dateutil.tz.tzlocal` makes system calls (via the :mod:`time` - module) to retrieve time zone information, ``tzwinlocal`` retrieves the - rules directly from the Windows registry and creates an object like - :class:`dateutil.tz.tzwin`. - - Because Windows does not have an equivalent of :func:`time.tzset`, on - Windows, :class:`dateutil.tz.tzlocal` instances will always reflect the - time zone settings *at the time that the process was started*, meaning - changes to the machine's time zone settings during the run of a program - on Windows will **not** be reflected by :class:`dateutil.tz.tzlocal`. - Because ``tzwinlocal`` reads the registry directly, it is unaffected by - this issue. - """ - def __init__(self): - with winreg.ConnectRegistry(None, winreg.HKEY_LOCAL_MACHINE) as handle: - with winreg.OpenKey(handle, TZLOCALKEYNAME) as tzlocalkey: - keydict = valuestodict(tzlocalkey) - - self._std_abbr = keydict["StandardName"] - self._dst_abbr = keydict["DaylightName"] - - try: - tzkeyname = text_type('{kn}\\{sn}').format(kn=TZKEYNAME, - sn=self._std_abbr) - with winreg.OpenKey(handle, tzkeyname) as tzkey: - _keydict = valuestodict(tzkey) - self._display = _keydict["Display"] - except OSError: - self._display = None - - stdoffset = -keydict["Bias"]-keydict["StandardBias"] - dstoffset = stdoffset-keydict["DaylightBias"] - - self._std_offset = datetime.timedelta(minutes=stdoffset) - self._dst_offset = datetime.timedelta(minutes=dstoffset) - - # For reasons unclear, in this particular key, the day of week has been - # moved to the END of the SYSTEMTIME structure. - tup = struct.unpack("=8h", keydict["StandardStart"]) - - (self._stdmonth, - self._stdweeknumber, # Last = 5 - self._stdhour, - self._stdminute) = tup[1:5] - - self._stddayofweek = tup[7] - - tup = struct.unpack("=8h", keydict["DaylightStart"]) - - (self._dstmonth, - self._dstweeknumber, # Last = 5 - self._dsthour, - self._dstminute) = tup[1:5] - - self._dstdayofweek = tup[7] - - self._dst_base_offset_ = self._dst_offset - self._std_offset - self.hasdst = self._get_hasdst() - - def __repr__(self): - return "tzwinlocal()" - - def __str__(self): - # str will return the standard name, not the daylight name. - return "tzwinlocal(%s)" % repr(self._std_abbr) - - def __reduce__(self): - return (self.__class__, ()) - - -def picknthweekday(year, month, dayofweek, hour, minute, whichweek): - """ dayofweek == 0 means Sunday, whichweek 5 means last instance """ - first = datetime.datetime(year, month, 1, hour, minute) - - # This will work if dayofweek is ISO weekday (1-7) or Microsoft-style (0-6), - # Because 7 % 7 = 0 - weekdayone = first.replace(day=((dayofweek - first.isoweekday()) % 7) + 1) - wd = weekdayone + ((whichweek - 1) * ONEWEEK) - if (wd.month != month): - wd -= ONEWEEK - - return wd - - -def valuestodict(key): - """Convert a registry key's values to a dictionary.""" - dout = {} - size = winreg.QueryInfoKey(key)[1] - tz_res = None - - for i in range(size): - key_name, value, dtype = winreg.EnumValue(key, i) - if dtype == winreg.REG_DWORD or dtype == winreg.REG_DWORD_LITTLE_ENDIAN: - # If it's a DWORD (32-bit integer), it's stored as unsigned - convert - # that to a proper signed integer - if value & (1 << 31): - value = value - (1 << 32) - elif dtype == winreg.REG_SZ: - # If it's a reference to the tzres DLL, load the actual string - if value.startswith('@tzres'): - tz_res = tz_res or tzres() - value = tz_res.name_from_string(value) - - value = value.rstrip('\x00') # Remove trailing nulls - - dout[key_name] = value - - return dout |