Mercurial > repos > bcclaywell > argo_navis

annotate venv/lib/python2.7/copy_reg.py @ 0:d67268158946 draft

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planemo upload commit a3f181f5f126803c654b3a66dd4e83a48f7e203b
author bcclaywell
date Mon, 12 Oct 2015 17:43:33 -0400
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1 """Helper to provide extensibility for pickle/cPickle.
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2
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3 This is only useful to add pickle support for extension types defined in
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4 C, not for instances of user-defined classes.
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5 """
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6
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7 from types import ClassType as _ClassType
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8
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9 __all__ = ["pickle", "constructor",
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10 "add_extension", "remove_extension", "clear_extension_cache"]
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11
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12 dispatch_table = {}
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13
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14 def pickle(ob_type, pickle_function, constructor_ob=None):
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15 if type(ob_type) is _ClassType:
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16 raise TypeError("copy_reg is not intended for use with classes")
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17
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18 if not hasattr(pickle_function, '__call__'):
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19 raise TypeError("reduction functions must be callable")
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20 dispatch_table[ob_type] = pickle_function
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21
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22 # The constructor_ob function is a vestige of safe for unpickling.
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23 # There is no reason for the caller to pass it anymore.
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24 if constructor_ob is not None:
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25 constructor(constructor_ob)
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26
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27 def constructor(object):
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28 if not hasattr(object, '__call__'):
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29 raise TypeError("constructors must be callable")
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30
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31 # Example: provide pickling support for complex numbers.
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32
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33 try:
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34 complex
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35 except NameError:
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36 pass
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37 else:
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38
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39 def pickle_complex(c):
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40 return complex, (c.real, c.imag)
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41
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42 pickle(complex, pickle_complex, complex)
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43
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44 # Support for pickling new-style objects
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45
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46 def _reconstructor(cls, base, state):
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47 if base is object:
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48 obj = object.__new__(cls)
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49 else:
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50 obj = base.__new__(cls, state)
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51 if base.__init__ != object.__init__:
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52 base.__init__(obj, state)
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53 return obj
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54
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55 _HEAPTYPE = 1<<9
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56
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57 # Python code for object.__reduce_ex__ for protocols 0 and 1
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58
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59 def _reduce_ex(self, proto):
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60 assert proto < 2
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61 for base in self.__class__.__mro__:
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62 if hasattr(base, '__flags__') and not base.__flags__ & _HEAPTYPE:
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63 break
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64 else:
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65 base = object # not really reachable
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66 if base is object:
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67 state = None
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68 else:
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69 if base is self.__class__:
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70 raise TypeError, "can't pickle %s objects" % base.__name__
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71 state = base(self)
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72 args = (self.__class__, base, state)
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73 try:
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74 getstate = self.__getstate__
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75 except AttributeError:
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76 if getattr(self, "__slots__", None):
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77 raise TypeError("a class that defines __slots__ without "
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78 "defining __getstate__ cannot be pickled")
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79 try:
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80 dict = self.__dict__
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81 except AttributeError:
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82 dict = None
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83 else:
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84 dict = getstate()
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85 if dict:
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86 return _reconstructor, args, dict
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87 else:
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88 return _reconstructor, args
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89
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90 # Helper for __reduce_ex__ protocol 2
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91
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92 def __newobj__(cls, *args):
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93 return cls.__new__(cls, *args)
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94
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95 def _slotnames(cls):
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96 """Return a list of slot names for a given class.
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97
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98 This needs to find slots defined by the class and its bases, so we
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99 can't simply return the __slots__ attribute. We must walk down
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100 the Method Resolution Order and concatenate the __slots__ of each
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101 class found there. (This assumes classes don't modify their
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102 __slots__ attribute to misrepresent their slots after the class is
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103 defined.)
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104 """
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105
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106 # Get the value from a cache in the class if possible
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107 names = cls.__dict__.get("__slotnames__")
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108 if names is not None:
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109 return names
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110
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111 # Not cached -- calculate the value
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112 names = []
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113 if not hasattr(cls, "__slots__"):
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114 # This class has no slots
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115 pass
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116 else:
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117 # Slots found -- gather slot names from all base classes
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118 for c in cls.__mro__:
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119 if "__slots__" in c.__dict__:
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120 slots = c.__dict__['__slots__']
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121 # if class has a single slot, it can be given as a string
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122 if isinstance(slots, basestring):
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123 slots = (slots,)
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124 for name in slots:
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125 # special descriptors
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126 if name in ("__dict__", "__weakref__"):
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127 continue
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128 # mangled names
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129 elif name.startswith('__') and not name.endswith('__'):
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130 names.append('_%s%s' % (c.__name__, name))
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131 else:
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132 names.append(name)
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133
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134 # Cache the outcome in the class if at all possible
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135 try:
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136 cls.__slotnames__ = names
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137 except:
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138 pass # But don't die if we can't
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139
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140 return names
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141
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142 # A registry of extension codes. This is an ad-hoc compression
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143 # mechanism. Whenever a global reference to <module>, <name> is about
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144 # to be pickled, the (<module>, <name>) tuple is looked up here to see
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145 # if it is a registered extension code for it. Extension codes are
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146 # universal, so that the meaning of a pickle does not depend on
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147 # context. (There are also some codes reserved for local use that
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148 # don't have this restriction.) Codes are positive ints; 0 is
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149 # reserved.
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150
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151 _extension_registry = {} # key -> code
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152 _inverted_registry = {} # code -> key
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153 _extension_cache = {} # code -> object
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154 # Don't ever rebind those names: cPickle grabs a reference to them when
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155 # it's initialized, and won't see a rebinding.
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156
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157 def add_extension(module, name, code):
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158 """Register an extension code."""
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159 code = int(code)
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160 if not 1 <= code <= 0x7fffffff:
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161 raise ValueError, "code out of range"
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162 key = (module, name)
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163 if (_extension_registry.get(key) == code and
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164 _inverted_registry.get(code) == key):
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165 return # Redundant registrations are benign
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166 if key in _extension_registry:
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167 raise ValueError("key %s is already registered with code %s" %
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168 (key, _extension_registry[key]))
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169 if code in _inverted_registry:
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170 raise ValueError("code %s is already in use for key %s" %
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171 (code, _inverted_registry[code]))
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172 _extension_registry[key] = code
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173 _inverted_registry[code] = key
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174
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175 def remove_extension(module, name, code):
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176 """Unregister an extension code. For testing only."""
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177 key = (module, name)
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178 if (_extension_registry.get(key) != code or
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179 _inverted_registry.get(code) != key):
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180 raise ValueError("key %s is not registered with code %s" %
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181 (key, code))
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182 del _extension_registry[key]
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183 del _inverted_registry[code]
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184 if code in _extension_cache:
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185 del _extension_cache[code]
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186
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187 def clear_extension_cache():
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188 _extension_cache.clear()
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189
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190 # Standard extension code assignments
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191
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192 # Reserved ranges
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193
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194 # First Last Count Purpose
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195 # 1 127 127 Reserved for Python standard library
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196 # 128 191 64 Reserved for Zope
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197 # 192 239 48 Reserved for 3rd parties
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198 # 240 255 16 Reserved for private use (will never be assigned)
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199 # 256 Inf Inf Reserved for future assignment
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200
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201 # Extension codes are assigned by the Python Software Foundation.