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from __future__ import annotations try: import winreg except ImportError: winreg = None import datetime from typing import Any, Dict, cast from babel.core import get_global from babel.localtime._helpers import _get_tzinfo_or_raise # When building the cldr data on windows this module gets imported. # Because at that point there is no global.dat yet this call will # fail. We want to catch it down in that case then and just assume # the mapping was empty. try: tz_names: dict[str, str] = cast(Dict[str, str], get_global('windows_zone_mapping')) except RuntimeError: tz_names = {} def valuestodict(key) -> dict[str, Any]: """Convert a registry key's values to a dictionary.""" dict = {} size = winreg.QueryInfoKey(key)[1] for i in range(size): data = winreg.EnumValue(key, i) dict[data[0]] = data[1] return dict def get_localzone_name() -> str: # Windows is special. It has unique time zone names (in several # meanings of the word) available, but unfortunately, they can be # translated to the language of the operating system, so we need to # do a backwards lookup, by going through all time zones and see which # one matches. handle = winreg.ConnectRegistry(None, winreg.HKEY_LOCAL_MACHINE) TZLOCALKEYNAME = r'SYSTEM\CurrentControlSet\Control\TimeZoneInformation' localtz = winreg.OpenKey(handle, TZLOCALKEYNAME) keyvalues = valuestodict(localtz) localtz.Close() if 'TimeZoneKeyName' in keyvalues: # Windows 7 (and Vista?) # For some reason this returns a string with loads of NUL bytes at # least on some systems. I don't know if this is a bug somewhere, I # just work around it. tzkeyname = keyvalues['TimeZoneKeyName'].split('\x00', 1)[0] else: # Windows 2000 or XP # This is the localized name: tzwin = keyvalues['StandardName'] # Open the list of timezones to look up the real name: TZKEYNAME = r'SOFTWARE\Microsoft\Windows NT\CurrentVersion\Time Zones' tzkey = winreg.OpenKey(handle, TZKEYNAME) # Now, match this value to Time Zone information tzkeyname = None for i in range(winreg.QueryInfoKey(tzkey)[0]): subkey = winreg.EnumKey(tzkey, i) sub = winreg.OpenKey(tzkey, subkey) data = valuestodict(sub) sub.Close() if data.get('Std', None) == tzwin: tzkeyname = subkey break tzkey.Close() handle.Close() if tzkeyname is None: raise LookupError('Can not find Windows timezone configuration') timezone = tz_names.get(tzkeyname) if timezone is None: # Nope, that didn't work. Try adding 'Standard Time', # it seems to work a lot of times: timezone = tz_names.get(f"{tzkeyname} Standard Time") # Return what we have. if timezone is None: raise LookupError(f"Can not find timezone {tzkeyname}") return timezone def _get_localzone() -> datetime.tzinfo: if winreg is None: raise LookupError( 'Runtime support not available') return _get_tzinfo_or_raise(get_localzone_name())
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