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annotate planemo/lib/python3.7/site-packages/dateutil/tz/_common.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 from six import PY2
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2
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3 from functools import wraps
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4
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5 from datetime import datetime, timedelta, tzinfo
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6
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7
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8 ZERO = timedelta(0)
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9
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10 __all__ = ['tzname_in_python2', 'enfold']
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11
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12
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13 def tzname_in_python2(namefunc):
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14 """Change unicode output into bytestrings in Python 2
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15
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16 tzname() API changed in Python 3. It used to return bytes, but was changed
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17 to unicode strings
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18 """
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19 if PY2:
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20 @wraps(namefunc)
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21 def adjust_encoding(*args, **kwargs):
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22 name = namefunc(*args, **kwargs)
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23 if name is not None:
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24 name = name.encode()
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25
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26 return name
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27
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28 return adjust_encoding
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29 else:
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30 return namefunc
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31
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32
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33 # The following is adapted from Alexander Belopolsky's tz library
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34 # https://github.com/abalkin/tz
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35 if hasattr(datetime, 'fold'):
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36 # This is the pre-python 3.6 fold situation
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37 def enfold(dt, fold=1):
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38 """
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39 Provides a unified interface for assigning the ``fold`` attribute to
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40 datetimes both before and after the implementation of PEP-495.
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41
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42 :param fold:
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43 The value for the ``fold`` attribute in the returned datetime. This
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44 should be either 0 or 1.
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45
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46 :return:
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47 Returns an object for which ``getattr(dt, 'fold', 0)`` returns
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48 ``fold`` for all versions of Python. In versions prior to
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49 Python 3.6, this is a ``_DatetimeWithFold`` object, which is a
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50 subclass of :py:class:`datetime.datetime` with the ``fold``
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51 attribute added, if ``fold`` is 1.
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52
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53 .. versionadded:: 2.6.0
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54 """
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55 return dt.replace(fold=fold)
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56
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57 else:
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58 class _DatetimeWithFold(datetime):
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59 """
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60 This is a class designed to provide a PEP 495-compliant interface for
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61 Python versions before 3.6. It is used only for dates in a fold, so
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62 the ``fold`` attribute is fixed at ``1``.
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63
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64 .. versionadded:: 2.6.0
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65 """
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66 __slots__ = ()
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67
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68 def replace(self, *args, **kwargs):
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69 """
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70 Return a datetime with the same attributes, except for those
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71 attributes given new values by whichever keyword arguments are
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72 specified. Note that tzinfo=None can be specified to create a naive
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73 datetime from an aware datetime with no conversion of date and time
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74 data.
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75
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76 This is reimplemented in ``_DatetimeWithFold`` because pypy3 will
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77 return a ``datetime.datetime`` even if ``fold`` is unchanged.
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78 """
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79 argnames = (
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80 'year', 'month', 'day', 'hour', 'minute', 'second',
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81 'microsecond', 'tzinfo'
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82 )
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83
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84 for arg, argname in zip(args, argnames):
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85 if argname in kwargs:
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86 raise TypeError('Duplicate argument: {}'.format(argname))
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87
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88 kwargs[argname] = arg
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89
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90 for argname in argnames:
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91 if argname not in kwargs:
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92 kwargs[argname] = getattr(self, argname)
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93
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94 dt_class = self.__class__ if kwargs.get('fold', 1) else datetime
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95
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96 return dt_class(**kwargs)
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97
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98 @property
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99 def fold(self):
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100 return 1
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101
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102 def enfold(dt, fold=1):
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103 """
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104 Provides a unified interface for assigning the ``fold`` attribute to
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105 datetimes both before and after the implementation of PEP-495.
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106
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107 :param fold:
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108 The value for the ``fold`` attribute in the returned datetime. This
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109 should be either 0 or 1.
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110
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111 :return:
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112 Returns an object for which ``getattr(dt, 'fold', 0)`` returns
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113 ``fold`` for all versions of Python. In versions prior to
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114 Python 3.6, this is a ``_DatetimeWithFold`` object, which is a
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115 subclass of :py:class:`datetime.datetime` with the ``fold``
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116 attribute added, if ``fold`` is 1.
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117
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118 .. versionadded:: 2.6.0
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119 """
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120 if getattr(dt, 'fold', 0) == fold:
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121 return dt
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122
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123 args = dt.timetuple()[:6]
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124 args += (dt.microsecond, dt.tzinfo)
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125
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126 if fold:
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127 return _DatetimeWithFold(*args)
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128 else:
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129 return datetime(*args)
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130
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131
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132 def _validate_fromutc_inputs(f):
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133 """
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134 The CPython version of ``fromutc`` checks that the input is a ``datetime``
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135 object and that ``self`` is attached as its ``tzinfo``.
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136 """
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137 @wraps(f)
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138 def fromutc(self, dt):
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139 if not isinstance(dt, datetime):
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140 raise TypeError("fromutc() requires a datetime argument")
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141 if dt.tzinfo is not self:
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142 raise ValueError("dt.tzinfo is not self")
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143
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144 return f(self, dt)
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145
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146 return fromutc
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147
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148
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149 class _tzinfo(tzinfo):
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150 """
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151 Base class for all ``dateutil`` ``tzinfo`` objects.
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152 """
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153
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154 def is_ambiguous(self, dt):
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155 """
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156 Whether or not the "wall time" of a given datetime is ambiguous in this
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157 zone.
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158
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159 :param dt:
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160 A :py:class:`datetime.datetime`, naive or time zone aware.
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161
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162
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163 :return:
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164 Returns ``True`` if ambiguous, ``False`` otherwise.
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165
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166 .. versionadded:: 2.6.0
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167 """
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168
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169 dt = dt.replace(tzinfo=self)
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170
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171 wall_0 = enfold(dt, fold=0)
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172 wall_1 = enfold(dt, fold=1)
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173
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174 same_offset = wall_0.utcoffset() == wall_1.utcoffset()
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175 same_dt = wall_0.replace(tzinfo=None) == wall_1.replace(tzinfo=None)
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176
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177 return same_dt and not same_offset
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178
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179 def _fold_status(self, dt_utc, dt_wall):
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180 """
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181 Determine the fold status of a "wall" datetime, given a representation
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182 of the same datetime as a (naive) UTC datetime. This is calculated based
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183 on the assumption that ``dt.utcoffset() - dt.dst()`` is constant for all
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184 datetimes, and that this offset is the actual number of hours separating
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185 ``dt_utc`` and ``dt_wall``.
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186
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187 :param dt_utc:
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188 Representation of the datetime as UTC
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189
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190 :param dt_wall:
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191 Representation of the datetime as "wall time". This parameter must
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192 either have a `fold` attribute or have a fold-naive
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193 :class:`datetime.tzinfo` attached, otherwise the calculation may
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194 fail.
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195 """
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196 if self.is_ambiguous(dt_wall):
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197 delta_wall = dt_wall - dt_utc
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198 _fold = int(delta_wall == (dt_utc.utcoffset() - dt_utc.dst()))
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199 else:
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200 _fold = 0
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201
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202 return _fold
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203
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204 def _fold(self, dt):
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205 return getattr(dt, 'fold', 0)
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206
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207 def _fromutc(self, dt):
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208 """
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209 Given a timezone-aware datetime in a given timezone, calculates a
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210 timezone-aware datetime in a new timezone.
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211
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212 Since this is the one time that we *know* we have an unambiguous
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213 datetime object, we take this opportunity to determine whether the
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214 datetime is ambiguous and in a "fold" state (e.g. if it's the first
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215 occurrence, chronologically, of the ambiguous datetime).
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216
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217 :param dt:
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218 A timezone-aware :class:`datetime.datetime` object.
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219 """
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220
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221 # Re-implement the algorithm from Python's datetime.py
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222 dtoff = dt.utcoffset()
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223 if dtoff is None:
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224 raise ValueError("fromutc() requires a non-None utcoffset() "
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225 "result")
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226
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227 # The original datetime.py code assumes that `dst()` defaults to
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228 # zero during ambiguous times. PEP 495 inverts this presumption, so
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229 # for pre-PEP 495 versions of python, we need to tweak the algorithm.
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230 dtdst = dt.dst()
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231 if dtdst is None:
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232 raise ValueError("fromutc() requires a non-None dst() result")
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233 delta = dtoff - dtdst
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234
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235 dt += delta
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236 # Set fold=1 so we can default to being in the fold for
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237 # ambiguous dates.
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238 dtdst = enfold(dt, fold=1).dst()
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239 if dtdst is None:
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240 raise ValueError("fromutc(): dt.dst gave inconsistent "
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241 "results; cannot convert")
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242 return dt + dtdst
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243
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244 @_validate_fromutc_inputs
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245 def fromutc(self, dt):
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246 """
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247 Given a timezone-aware datetime in a given timezone, calculates a
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248 timezone-aware datetime in a new timezone.
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249
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250 Since this is the one time that we *know* we have an unambiguous
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251 datetime object, we take this opportunity to determine whether the
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252 datetime is ambiguous and in a "fold" state (e.g. if it's the first
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253 occurrence, chronologically, of the ambiguous datetime).
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254
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255 :param dt:
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256 A timezone-aware :class:`datetime.datetime` object.
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257 """
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258 dt_wall = self._fromutc(dt)
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259
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260 # Calculate the fold status given the two datetimes.
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261 _fold = self._fold_status(dt, dt_wall)
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262
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263 # Set the default fold value for ambiguous dates
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264 return enfold(dt_wall, fold=_fold)
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265
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266
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267 class tzrangebase(_tzinfo):
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268 """
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269 This is an abstract base class for time zones represented by an annual
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270 transition into and out of DST. Child classes should implement the following
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271 methods:
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272
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273 * ``__init__(self, *args, **kwargs)``
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274 * ``transitions(self, year)`` - this is expected to return a tuple of
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275 datetimes representing the DST on and off transitions in standard
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276 time.
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277
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278 A fully initialized ``tzrangebase`` subclass should also provide the
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279 following attributes:
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280 * ``hasdst``: Boolean whether or not the zone uses DST.
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281 * ``_dst_offset`` / ``_std_offset``: :class:`datetime.timedelta` objects
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282 representing the respective UTC offsets.
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283 * ``_dst_abbr`` / ``_std_abbr``: Strings representing the timezone short
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284 abbreviations in DST and STD, respectively.
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285 * ``_hasdst``: Whether or not the zone has DST.
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286
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287 .. versionadded:: 2.6.0
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288 """
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289 def __init__(self):
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290 raise NotImplementedError('tzrangebase is an abstract base class')
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291
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292 def utcoffset(self, dt):
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293 isdst = self._isdst(dt)
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294
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295 if isdst is None:
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296 return None
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297 elif isdst:
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298 return self._dst_offset
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299 else:
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300 return self._std_offset
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301
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302 def dst(self, dt):
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303 isdst = self._isdst(dt)
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304
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305 if isdst is None:
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306 return None
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307 elif isdst:
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308 return self._dst_base_offset
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309 else:
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310 return ZERO
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311
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312 @tzname_in_python2
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313 def tzname(self, dt):
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314 if self._isdst(dt):
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315 return self._dst_abbr
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316 else:
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317 return self._std_abbr
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318
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319 def fromutc(self, dt):
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320 """ Given a datetime in UTC, return local time """
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321 if not isinstance(dt, datetime):
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322 raise TypeError("fromutc() requires a datetime argument")
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323
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324 if dt.tzinfo is not self:
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325 raise ValueError("dt.tzinfo is not self")
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326
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327 # Get transitions - if there are none, fixed offset
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328 transitions = self.transitions(dt.year)
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329 if transitions is None:
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330 return dt + self.utcoffset(dt)
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331
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332 # Get the transition times in UTC
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333 dston, dstoff = transitions
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334
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335 dston -= self._std_offset
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336 dstoff -= self._std_offset
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337
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338 utc_transitions = (dston, dstoff)
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339 dt_utc = dt.replace(tzinfo=None)
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340
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341 isdst = self._naive_isdst(dt_utc, utc_transitions)
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342
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343 if isdst:
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344 dt_wall = dt + self._dst_offset
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345 else:
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346 dt_wall = dt + self._std_offset
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347
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348 _fold = int(not isdst and self.is_ambiguous(dt_wall))
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349
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350 return enfold(dt_wall, fold=_fold)
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351
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352 def is_ambiguous(self, dt):
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353 """
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354 Whether or not the "wall time" of a given datetime is ambiguous in this
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355 zone.
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356
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357 :param dt:
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358 A :py:class:`datetime.datetime`, naive or time zone aware.
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359
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360
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361 :return:
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362 Returns ``True`` if ambiguous, ``False`` otherwise.
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363
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364 .. versionadded:: 2.6.0
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365 """
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366 if not self.hasdst:
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367 return False
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368
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369 start, end = self.transitions(dt.year)
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370
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371 dt = dt.replace(tzinfo=None)
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372 return (end <= dt < end + self._dst_base_offset)
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373
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374 def _isdst(self, dt):
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375 if not self.hasdst:
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376 return False
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377 elif dt is None:
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378 return None
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379
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380 transitions = self.transitions(dt.year)
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381
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382 if transitions is None:
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383 return False
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384
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385 dt = dt.replace(tzinfo=None)
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386
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387 isdst = self._naive_isdst(dt, transitions)
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388
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389 # Handle ambiguous dates
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390 if not isdst and self.is_ambiguous(dt):
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391 return not self._fold(dt)
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392 else:
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393 return isdst
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394
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395 def _naive_isdst(self, dt, transitions):
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396 dston, dstoff = transitions
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397
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398 dt = dt.replace(tzinfo=None)
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399
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400 if dston < dstoff:
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401 isdst = dston <= dt < dstoff
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402 else:
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403 isdst = not dstoff <= dt < dston
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404
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405 return isdst
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406
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407 @property
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408 def _dst_base_offset(self):
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409 return self._dst_offset - self._std_offset
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410
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411 __hash__ = None
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412
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413 def __ne__(self, other):
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414 return not (self == other)
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415
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416 def __repr__(self):
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417 return "%s(...)" % self.__class__.__name__
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418
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419 __reduce__ = object.__reduce__