Mercurial > cpython-lru_cache-weakref

annotate Lib/_weakrefset.py @ 81343:3a7cd8efc19f

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#16852: merge with 3.3.
author Ezio Melotti <ezio.melotti@gmail.com>
date Thu, 10 Jan 2013 03:29:45 +0200
parents 5b88475aae96
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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e6069b24031e Moved WeakSet into a bootstap module use by abc.py.
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1 # Access WeakSet through the weakref module.
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2 # This code is separated-out because it is needed
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3 # by abc.py to load everything else at startup.
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4
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5 from _weakref import ref
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6
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7 __all__ = ['WeakSet']
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8
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9
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10 class _IterationGuard:
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11 # This context manager registers itself in the current iterators of the
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12 # weak container, such as to delay all removals until the context manager
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13 # exits.
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14 # This technique should be relatively thread-safe (since sets are).
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15
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16 def __init__(self, weakcontainer):
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17 # Don't create cycles
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18 self.weakcontainer = ref(weakcontainer)
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19
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20 def __enter__(self):
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21 w = self.weakcontainer()
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22 if w is not None:
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23 w._iterating.add(self)
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24 return self
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25
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26 def __exit__(self, e, t, b):
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27 w = self.weakcontainer()
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28 if w is not None:
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29 s = w._iterating
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30 s.remove(self)
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31 if not s:
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32 w._commit_removals()
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33
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34
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35 class WeakSet:
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36 def __init__(self, data=None):
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37 self.data = set()
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38 def _remove(item, selfref=ref(self)):
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39 self = selfref()
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40 if self is not None:
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41 if self._iterating:
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42 self._pending_removals.append(item)
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43 else:
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44 self.data.discard(item)
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45 self._remove = _remove
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46 # A list of keys to be removed
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47 self._pending_removals = []
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48 self._iterating = set()
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49 if data is not None:
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50 self.update(data)
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51
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52 def _commit_removals(self):
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53 l = self._pending_removals
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54 discard = self.data.discard
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55 while l:
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56 discard(l.pop())
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57
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58 def __iter__(self):
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59 with _IterationGuard(self):
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60 for itemref in self.data:
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61 item = itemref()
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62 if item is not None:
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63 yield item
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64
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65 def __len__(self):
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66 return len(self.data) - len(self._pending_removals)
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67
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68 def __contains__(self, item):
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69 try:
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70 wr = ref(item)
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71 except TypeError:
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72 return False
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73 return wr in self.data
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74
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75 def __reduce__(self):
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76 return (self.__class__, (list(self),),
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77 getattr(self, '__dict__', None))
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78
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79 def add(self, item):
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80 if self._pending_removals:
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81 self._commit_removals()
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82 self.data.add(ref(item, self._remove))
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83
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84 def clear(self):
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85 if self._pending_removals:
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86 self._commit_removals()
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87 self.data.clear()
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88
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89 def copy(self):
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90 return self.__class__(self)
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91
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92 def pop(self):
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93 if self._pending_removals:
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94 self._commit_removals()
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95 while True:
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96 try:
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97 itemref = self.data.pop()
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98 except KeyError:
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99 raise KeyError('pop from empty WeakSet')
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100 item = itemref()
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101 if item is not None:
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102 return item
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103
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104 def remove(self, item):
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105 if self._pending_removals:
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106 self._commit_removals()
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107 self.data.remove(ref(item))
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108
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109 def discard(self, item):
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110 if self._pending_removals:
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111 self._commit_removals()
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112 self.data.discard(ref(item))
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113
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114 def update(self, other):
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115 if self._pending_removals:
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116 self._commit_removals()
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117 for element in other:
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118 self.add(element)
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119
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120 def __ior__(self, other):
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121 self.update(other)
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122 return self
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123
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124 def difference(self, other):
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125 newset = self.copy()
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126 newset.difference_update(other)
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127 return newset
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128 __sub__ = difference
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129
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130 def difference_update(self, other):
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131 self.__isub__(other)
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132 def __isub__(self, other):
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133 if self._pending_removals:
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134 self._commit_removals()
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135 if self is other:
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136 self.data.clear()
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137 else:
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138 self.data.difference_update(ref(item) for item in other)
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139 return self
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140
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141 def intersection(self, other):
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142 return self.__class__(item for item in other if item in self)
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143 __and__ = intersection
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144
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145 def intersection_update(self, other):
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146 self.__iand__(other)
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147 def __iand__(self, other):
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148 if self._pending_removals:
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149 self._commit_removals()
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150 self.data.intersection_update(ref(item) for item in other)
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151 return self
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152
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153 def issubset(self, other):
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154 return self.data.issubset(ref(item) for item in other)
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155 __le__ = issubset
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156
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157 def __lt__(self, other):
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158 return self.data < set(ref(item) for item in other)
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159
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160 def issuperset(self, other):
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161 return self.data.issuperset(ref(item) for item in other)
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162 __ge__ = issuperset
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163
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164 def __gt__(self, other):
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165 return self.data > set(ref(item) for item in other)
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166
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167 def __eq__(self, other):
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168 if not isinstance(other, self.__class__):
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169 return NotImplemented
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170 return self.data == set(ref(item) for item in other)
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171
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172 def symmetric_difference(self, other):
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173 newset = self.copy()
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174 newset.symmetric_difference_update(other)
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175 return newset
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176 __xor__ = symmetric_difference
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177
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178 def symmetric_difference_update(self, other):
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179 self.__ixor__(other)
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180 def __ixor__(self, other):
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181 if self._pending_removals:
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182 self._commit_removals()
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183 if self is other:
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184 self.data.clear()
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185 else:
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186 self.data.symmetric_difference_update(ref(item, self._remove) for item in other)
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187 return self
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188
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189 def union(self, other):
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190 return self.__class__(e for s in (self, other) for e in s)
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191 __or__ = union
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192
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193 def isdisjoint(self, other):
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194 return len(self.intersection(other)) == 0