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annotate planemo/lib/python3.7/site-packages/dateutil/tz/win.py @ 1:56ad4e20f292 draft

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"planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
author guerler
date Fri, 31 Jul 2020 00:32:28 -0400
parents d30785e31577
children
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1 # -*- coding: utf-8 -*-
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2 """
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3 This module provides an interface to the native time zone data on Windows,
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4 including :py:class:`datetime.tzinfo` implementations.
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5
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6 Attempting to import this module on a non-Windows platform will raise an
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7 :py:obj:`ImportError`.
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8 """
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9 # This code was originally contributed by Jeffrey Harris.
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10 import datetime
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11 import struct
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12
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13 from six.moves import winreg
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14 from six import text_type
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15
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16 try:
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17 import ctypes
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18 from ctypes import wintypes
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19 except ValueError:
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20 # ValueError is raised on non-Windows systems for some horrible reason.
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21 raise ImportError("Running tzwin on non-Windows system")
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22
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23 from ._common import tzrangebase
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24
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25 __all__ = ["tzwin", "tzwinlocal", "tzres"]
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26
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27 ONEWEEK = datetime.timedelta(7)
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28
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29 TZKEYNAMENT = r"SOFTWARE\Microsoft\Windows NT\CurrentVersion\Time Zones"
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30 TZKEYNAME9X = r"SOFTWARE\Microsoft\Windows\CurrentVersion\Time Zones"
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31 TZLOCALKEYNAME = r"SYSTEM\CurrentControlSet\Control\TimeZoneInformation"
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32
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33
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34 def _settzkeyname():
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35 handle = winreg.ConnectRegistry(None, winreg.HKEY_LOCAL_MACHINE)
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36 try:
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37 winreg.OpenKey(handle, TZKEYNAMENT).Close()
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38 TZKEYNAME = TZKEYNAMENT
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39 except WindowsError:
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40 TZKEYNAME = TZKEYNAME9X
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41 handle.Close()
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42 return TZKEYNAME
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43
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44
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45 TZKEYNAME = _settzkeyname()
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46
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47
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48 class tzres(object):
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49 """
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50 Class for accessing ``tzres.dll``, which contains timezone name related
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51 resources.
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52
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53 .. versionadded:: 2.5.0
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54 """
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55 p_wchar = ctypes.POINTER(wintypes.WCHAR) # Pointer to a wide char
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56
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57 def __init__(self, tzres_loc='tzres.dll'):
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58 # Load the user32 DLL so we can load strings from tzres
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59 user32 = ctypes.WinDLL('user32')
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60
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61 # Specify the LoadStringW function
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62 user32.LoadStringW.argtypes = (wintypes.HINSTANCE,
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63 wintypes.UINT,
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64 wintypes.LPWSTR,
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65 ctypes.c_int)
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66
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67 self.LoadStringW = user32.LoadStringW
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68 self._tzres = ctypes.WinDLL(tzres_loc)
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69 self.tzres_loc = tzres_loc
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70
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71 def load_name(self, offset):
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72 """
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73 Load a timezone name from a DLL offset (integer).
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74
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75 >>> from dateutil.tzwin import tzres
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76 >>> tzr = tzres()
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77 >>> print(tzr.load_name(112))
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78 'Eastern Standard Time'
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79
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80 :param offset:
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81 A positive integer value referring to a string from the tzres dll.
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82
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83 .. note::
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84
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85 Offsets found in the registry are generally of the form
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86 ``@tzres.dll,-114``. The offset in this case is 114, not -114.
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87
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88 """
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89 resource = self.p_wchar()
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90 lpBuffer = ctypes.cast(ctypes.byref(resource), wintypes.LPWSTR)
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91 nchar = self.LoadStringW(self._tzres._handle, offset, lpBuffer, 0)
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92 return resource[:nchar]
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93
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94 def name_from_string(self, tzname_str):
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95 """
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96 Parse strings as returned from the Windows registry into the time zone
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97 name as defined in the registry.
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98
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99 >>> from dateutil.tzwin import tzres
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100 >>> tzr = tzres()
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101 >>> print(tzr.name_from_string('@tzres.dll,-251'))
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102 'Dateline Daylight Time'
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103 >>> print(tzr.name_from_string('Eastern Standard Time'))
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104 'Eastern Standard Time'
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105
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106 :param tzname_str:
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107 A timezone name string as returned from a Windows registry key.
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108
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109 :return:
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110 Returns the localized timezone string from tzres.dll if the string
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111 is of the form `@tzres.dll,-offset`, else returns the input string.
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112 """
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113 if not tzname_str.startswith('@'):
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114 return tzname_str
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115
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116 name_splt = tzname_str.split(',-')
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117 try:
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118 offset = int(name_splt[1])
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119 except:
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120 raise ValueError("Malformed timezone string.")
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121
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122 return self.load_name(offset)
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123
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124
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125 class tzwinbase(tzrangebase):
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126 """tzinfo class based on win32's timezones available in the registry."""
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127 def __init__(self):
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128 raise NotImplementedError('tzwinbase is an abstract base class')
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129
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130 def __eq__(self, other):
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131 # Compare on all relevant dimensions, including name.
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132 if not isinstance(other, tzwinbase):
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133 return NotImplemented
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134
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135 return (self._std_offset == other._std_offset and
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136 self._dst_offset == other._dst_offset and
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137 self._stddayofweek == other._stddayofweek and
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138 self._dstdayofweek == other._dstdayofweek and
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139 self._stdweeknumber == other._stdweeknumber and
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140 self._dstweeknumber == other._dstweeknumber and
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141 self._stdhour == other._stdhour and
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142 self._dsthour == other._dsthour and
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143 self._stdminute == other._stdminute and
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144 self._dstminute == other._dstminute and
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145 self._std_abbr == other._std_abbr and
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146 self._dst_abbr == other._dst_abbr)
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147
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148 @staticmethod
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149 def list():
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150 """Return a list of all time zones known to the system."""
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151 with winreg.ConnectRegistry(None, winreg.HKEY_LOCAL_MACHINE) as handle:
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152 with winreg.OpenKey(handle, TZKEYNAME) as tzkey:
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153 result = [winreg.EnumKey(tzkey, i)
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154 for i in range(winreg.QueryInfoKey(tzkey)[0])]
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155 return result
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156
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157 def display(self):
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158 """
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159 Return the display name of the time zone.
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160 """
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161 return self._display
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162
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163 def transitions(self, year):
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164 """
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165 For a given year, get the DST on and off transition times, expressed
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166 always on the standard time side. For zones with no transitions, this
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167 function returns ``None``.
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168
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169 :param year:
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170 The year whose transitions you would like to query.
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171
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172 :return:
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173 Returns a :class:`tuple` of :class:`datetime.datetime` objects,
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174 ``(dston, dstoff)`` for zones with an annual DST transition, or
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175 ``None`` for fixed offset zones.
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176 """
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177
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178 if not self.hasdst:
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179 return None
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180
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181 dston = picknthweekday(year, self._dstmonth, self._dstdayofweek,
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182 self._dsthour, self._dstminute,
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183 self._dstweeknumber)
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184
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185 dstoff = picknthweekday(year, self._stdmonth, self._stddayofweek,
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186 self._stdhour, self._stdminute,
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187 self._stdweeknumber)
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188
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189 # Ambiguous dates default to the STD side
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190 dstoff -= self._dst_base_offset
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191
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192 return dston, dstoff
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193
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194 def _get_hasdst(self):
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195 return self._dstmonth != 0
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196
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197 @property
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198 def _dst_base_offset(self):
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199 return self._dst_base_offset_
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200
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201
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202 class tzwin(tzwinbase):
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203 """
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204 Time zone object created from the zone info in the Windows registry
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205
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206 These are similar to :py:class:`dateutil.tz.tzrange` objects in that
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207 the time zone data is provided in the format of a single offset rule
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208 for either 0 or 2 time zone transitions per year.
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209
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210 :param: name
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211 The name of a Windows time zone key, e.g. "Eastern Standard Time".
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212 The full list of keys can be retrieved with :func:`tzwin.list`.
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213 """
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214
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215 def __init__(self, name):
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216 self._name = name
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217
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218 with winreg.ConnectRegistry(None, winreg.HKEY_LOCAL_MACHINE) as handle:
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219 tzkeyname = text_type("{kn}\\{name}").format(kn=TZKEYNAME, name=name)
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220 with winreg.OpenKey(handle, tzkeyname) as tzkey:
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221 keydict = valuestodict(tzkey)
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222
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223 self._std_abbr = keydict["Std"]
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224 self._dst_abbr = keydict["Dlt"]
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225
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226 self._display = keydict["Display"]
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227
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228 # See http://ww_winreg.jsiinc.com/SUBA/tip0300/rh0398.htm
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229 tup = struct.unpack("=3l16h", keydict["TZI"])
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230 stdoffset = -tup[0]-tup[1] # Bias + StandardBias * -1
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231 dstoffset = stdoffset-tup[2] # + DaylightBias * -1
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232 self._std_offset = datetime.timedelta(minutes=stdoffset)
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233 self._dst_offset = datetime.timedelta(minutes=dstoffset)
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234
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235 # for the meaning see the win32 TIME_ZONE_INFORMATION structure docs
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236 # http://msdn.microsoft.com/en-us/library/windows/desktop/ms725481(v=vs.85).aspx
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237 (self._stdmonth,
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238 self._stddayofweek, # Sunday = 0
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239 self._stdweeknumber, # Last = 5
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240 self._stdhour,
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241 self._stdminute) = tup[4:9]
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242
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243 (self._dstmonth,
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244 self._dstdayofweek, # Sunday = 0
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245 self._dstweeknumber, # Last = 5
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246 self._dsthour,
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247 self._dstminute) = tup[12:17]
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248
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249 self._dst_base_offset_ = self._dst_offset - self._std_offset
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250 self.hasdst = self._get_hasdst()
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251
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252 def __repr__(self):
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253 return "tzwin(%s)" % repr(self._name)
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254
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255 def __reduce__(self):
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256 return (self.__class__, (self._name,))
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257
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258
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259 class tzwinlocal(tzwinbase):
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260 """
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261 Class representing the local time zone information in the Windows registry
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262
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263 While :class:`dateutil.tz.tzlocal` makes system calls (via the :mod:`time`
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264 module) to retrieve time zone information, ``tzwinlocal`` retrieves the
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265 rules directly from the Windows registry and creates an object like
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266 :class:`dateutil.tz.tzwin`.
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267
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268 Because Windows does not have an equivalent of :func:`time.tzset`, on
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269 Windows, :class:`dateutil.tz.tzlocal` instances will always reflect the
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270 time zone settings *at the time that the process was started*, meaning
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271 changes to the machine's time zone settings during the run of a program
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272 on Windows will **not** be reflected by :class:`dateutil.tz.tzlocal`.
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273 Because ``tzwinlocal`` reads the registry directly, it is unaffected by
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274 this issue.
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275 """
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276 def __init__(self):
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277 with winreg.ConnectRegistry(None, winreg.HKEY_LOCAL_MACHINE) as handle:
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278 with winreg.OpenKey(handle, TZLOCALKEYNAME) as tzlocalkey:
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279 keydict = valuestodict(tzlocalkey)
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280
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281 self._std_abbr = keydict["StandardName"]
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282 self._dst_abbr = keydict["DaylightName"]
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283
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284 try:
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285 tzkeyname = text_type('{kn}\\{sn}').format(kn=TZKEYNAME,
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286 sn=self._std_abbr)
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287 with winreg.OpenKey(handle, tzkeyname) as tzkey:
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288 _keydict = valuestodict(tzkey)
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289 self._display = _keydict["Display"]
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290 except OSError:
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291 self._display = None
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292
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293 stdoffset = -keydict["Bias"]-keydict["StandardBias"]
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294 dstoffset = stdoffset-keydict["DaylightBias"]
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295
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296 self._std_offset = datetime.timedelta(minutes=stdoffset)
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297 self._dst_offset = datetime.timedelta(minutes=dstoffset)
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298
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299 # For reasons unclear, in this particular key, the day of week has been
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300 # moved to the END of the SYSTEMTIME structure.
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301 tup = struct.unpack("=8h", keydict["StandardStart"])
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302
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303 (self._stdmonth,
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304 self._stdweeknumber, # Last = 5
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305 self._stdhour,
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306 self._stdminute) = tup[1:5]
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307
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308 self._stddayofweek = tup[7]
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309
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310 tup = struct.unpack("=8h", keydict["DaylightStart"])
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311
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312 (self._dstmonth,
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313 self._dstweeknumber, # Last = 5
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314 self._dsthour,
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315 self._dstminute) = tup[1:5]
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316
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317 self._dstdayofweek = tup[7]
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318
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319 self._dst_base_offset_ = self._dst_offset - self._std_offset
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320 self.hasdst = self._get_hasdst()
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321
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322 def __repr__(self):
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323 return "tzwinlocal()"
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324
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325 def __str__(self):
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326 # str will return the standard name, not the daylight name.
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327 return "tzwinlocal(%s)" % repr(self._std_abbr)
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328
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329 def __reduce__(self):
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330 return (self.__class__, ())
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331
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332
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333 def picknthweekday(year, month, dayofweek, hour, minute, whichweek):
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334 """ dayofweek == 0 means Sunday, whichweek 5 means last instance """
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335 first = datetime.datetime(year, month, 1, hour, minute)
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336
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337 # This will work if dayofweek is ISO weekday (1-7) or Microsoft-style (0-6),
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338 # Because 7 % 7 = 0
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339 weekdayone = first.replace(day=((dayofweek - first.isoweekday()) % 7) + 1)
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340 wd = weekdayone + ((whichweek - 1) * ONEWEEK)
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341 if (wd.month != month):
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342 wd -= ONEWEEK
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343
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344 return wd
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345
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346
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347 def valuestodict(key):
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348 """Convert a registry key's values to a dictionary."""
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349 dout = {}
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350 size = winreg.QueryInfoKey(key)[1]
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351 tz_res = None
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352
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353 for i in range(size):
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354 key_name, value, dtype = winreg.EnumValue(key, i)
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355 if dtype == winreg.REG_DWORD or dtype == winreg.REG_DWORD_LITTLE_ENDIAN:
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356 # If it's a DWORD (32-bit integer), it's stored as unsigned - convert
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357 # that to a proper signed integer
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358 if value & (1 << 31):
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359 value = value - (1 << 32)
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360 elif dtype == winreg.REG_SZ:
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361 # If it's a reference to the tzres DLL, load the actual string
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362 if value.startswith('@tzres'):
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363 tz_res = tz_res or tzres()
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364 value = tz_res.name_from_string(value)
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365
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366 value = value.rstrip('\x00') # Remove trailing nulls
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367
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368 dout[key_name] = value
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369
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370 return dout