Mercurial > hg
annotate mercurial/thirdparty/zope/interface/declarations.py @ 37208:b9dd8403d8ff
zope: force module import by importing symbols
Previously, we tried to import a module and handle the ImportError.
Our lazy module importer doesn't verify the module exists and returns
a dummy object representing the module. Only once we attempt to load
a symbol in the module does the ImportError get raises.
This means that simple imports inside `try..except ImportError` don't
detect missing modules.
This commit changes imports in zope.interface to access symbols, thus
forcing module load and triggering ImportError.
This fixes zope.interface for pure builds.
Differential Revision: https://phab.mercurial-scm.org/D2980
author | Gregory Szorc <gregory.szorc@gmail.com> |
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date | Fri, 30 Mar 2018 13:39:06 -0700 |
parents | 49630e75635d |
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rev | line source |
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1 ############################################################################## |
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2 # Copyright (c) 2003 Zope Foundation and Contributors. |
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3 # All Rights Reserved. |
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4 # |
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5 # This software is subject to the provisions of the Zope Public License, |
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6 # Version 2.1 (ZPL). A copy of the ZPL should accompany this distribution. |
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7 # THIS SOFTWARE IS PROVIDED "AS IS" AND ANY AND ALL EXPRESS OR IMPLIED |
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8 # WARRANTIES ARE DISCLAIMED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED |
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9 # WARRANTIES OF TITLE, MERCHANTABILITY, AGAINST INFRINGEMENT, AND FITNESS |
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10 # FOR A PARTICULAR PURPOSE. |
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11 ############################################################################## |
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12 """Implementation of interface declarations |
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13 |
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14 There are three flavors of declarations: |
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15 |
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16 - Declarations are used to simply name declared interfaces. |
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17 |
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18 - ImplementsDeclarations are used to express the interfaces that a |
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19 class implements (that instances of the class provides). |
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20 |
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21 Implements specifications support inheriting interfaces. |
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22 |
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23 - ProvidesDeclarations are used to express interfaces directly |
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24 provided by objects. |
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25 |
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26 """ |
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27 from __future__ import absolute_import |
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28 |
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29 __docformat__ = 'restructuredtext' |
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30 |
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31 import sys |
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32 from types import FunctionType |
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33 from types import MethodType |
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34 from types import ModuleType |
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35 import weakref |
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36 |
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37 from . import advice as advicemod |
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38 from .interface import InterfaceClass |
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39 from .interface import SpecificationBase |
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40 from .interface import Specification |
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41 from ._compat import CLASS_TYPES as DescriptorAwareMetaClasses |
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42 from ._compat import PYTHON3 |
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43 |
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44 # Registry of class-implementation specifications |
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45 BuiltinImplementationSpecifications = {} |
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46 |
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47 _ADVICE_ERROR = ('Class advice impossible in Python3. ' |
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48 'Use the @%s class decorator instead.') |
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49 |
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50 _ADVICE_WARNING = ('The %s API is deprecated, and will not work in Python3 ' |
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51 'Use the @%s class decorator instead.') |
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52 |
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53 class named(object): |
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54 |
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55 def __init__(self, name): |
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56 self.name = name |
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57 |
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58 def __call__(self, ob): |
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59 ob.__component_name__ = self.name |
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60 return ob |
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61 |
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62 class Declaration(Specification): |
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63 """Interface declarations""" |
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64 |
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65 def __init__(self, *interfaces): |
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66 Specification.__init__(self, _normalizeargs(interfaces)) |
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67 |
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68 def changed(self, originally_changed): |
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69 Specification.changed(self, originally_changed) |
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70 try: |
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71 del self._v_attrs |
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72 except AttributeError: |
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73 pass |
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74 |
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75 def __contains__(self, interface): |
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76 """Test whether an interface is in the specification |
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77 """ |
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78 |
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79 return self.extends(interface) and interface in self.interfaces() |
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80 |
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81 def __iter__(self): |
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82 """Return an iterator for the interfaces in the specification |
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83 """ |
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84 return self.interfaces() |
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85 |
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86 def flattened(self): |
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87 """Return an iterator of all included and extended interfaces |
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88 """ |
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89 return iter(self.__iro__) |
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90 |
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91 def __sub__(self, other): |
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92 """Remove interfaces from a specification |
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93 """ |
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94 return Declaration( |
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95 *[i for i in self.interfaces() |
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96 if not [j for j in other.interfaces() |
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97 if i.extends(j, 0)] |
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98 ] |
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99 ) |
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100 |
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101 def __add__(self, other): |
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102 """Add two specifications or a specification and an interface |
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103 """ |
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104 seen = {} |
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105 result = [] |
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106 for i in self.interfaces(): |
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107 seen[i] = 1 |
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108 result.append(i) |
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109 for i in other.interfaces(): |
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110 if i not in seen: |
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111 seen[i] = 1 |
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112 result.append(i) |
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113 |
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114 return Declaration(*result) |
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115 |
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116 __radd__ = __add__ |
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117 |
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118 |
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119 ############################################################################## |
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120 # |
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121 # Implementation specifications |
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122 # |
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123 # These specify interfaces implemented by instances of classes |
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124 |
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125 class Implements(Declaration): |
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126 |
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127 # class whose specification should be used as additional base |
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128 inherit = None |
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129 |
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130 # interfaces actually declared for a class |
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131 declared = () |
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132 |
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133 __name__ = '?' |
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134 |
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135 @classmethod |
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136 def named(cls, name, *interfaces): |
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137 # Implementation method: Produce an Implements interface with |
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138 # a fully fleshed out __name__ before calling the constructor, which |
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139 # sets bases to the given interfaces and which may pass this object to |
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140 # other objects (e.g., to adjust dependents). If they're sorting or comparing |
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141 # by name, this needs to be set. |
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142 inst = cls.__new__(cls) |
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143 inst.__name__ = name |
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144 inst.__init__(*interfaces) |
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145 return inst |
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146 |
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147 def __repr__(self): |
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148 return '<implementedBy %s>' % (self.__name__) |
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149 |
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150 def __reduce__(self): |
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151 return implementedBy, (self.inherit, ) |
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152 |
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153 def __cmp(self, other): |
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154 # Yes, I did mean to name this __cmp, rather than __cmp__. |
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155 # It is a private method used by __lt__ and __gt__. |
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156 # This is based on, and compatible with, InterfaceClass. |
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157 # (The two must be mutually comparable to be able to work in e.g., BTrees.) |
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158 # Instances of this class generally don't have a __module__ other than |
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159 # `zope.interface.declarations`, whereas they *do* have a __name__ that is the |
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160 # fully qualified name of the object they are representing. |
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161 |
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162 # Note, though, that equality and hashing are still identity based. This |
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163 # accounts for things like nested objects that have the same name (typically |
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164 # only in tests) and is consistent with pickling. As far as comparisons to InterfaceClass |
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165 # goes, we'll never have equal name and module to those, so we're still consistent there. |
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166 # Instances of this class are essentially intended to be unique and are |
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167 # heavily cached (note how our __reduce__ handles this) so having identity |
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168 # based hash and eq should also work. |
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169 if other is None: |
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170 return -1 |
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171 |
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172 n1 = (self.__name__, self.__module__) |
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173 n2 = (getattr(other, '__name__', ''), getattr(other, '__module__', '')) |
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174 |
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175 # This spelling works under Python3, which doesn't have cmp(). |
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176 return (n1 > n2) - (n1 < n2) |
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177 |
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178 def __hash__(self): |
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179 return Declaration.__hash__(self) |
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180 |
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181 # We want equality to be based on identity. However, we can't actually |
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182 # implement __eq__/__ne__ to do this because sometimes we get wrapped in a proxy. |
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183 # We need to let the proxy types implement these methods so they can handle unwrapping |
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184 # and then rely on: (1) the interpreter automatically changing `implements == proxy` into |
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185 # `proxy == implements` (which will call proxy.__eq__ to do the unwrapping) and then |
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186 # (2) the default equality semantics being identity based. |
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187 |
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188 def __lt__(self, other): |
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189 c = self.__cmp(other) |
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190 return c < 0 |
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191 |
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192 def __le__(self, other): |
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193 c = self.__cmp(other) |
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194 return c <= 0 |
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195 |
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196 def __gt__(self, other): |
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197 c = self.__cmp(other) |
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198 return c > 0 |
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199 |
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200 def __ge__(self, other): |
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201 c = self.__cmp(other) |
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202 return c >= 0 |
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203 |
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204 def _implements_name(ob): |
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205 # Return the __name__ attribute to be used by its __implemented__ |
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206 # property. |
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207 # This must be stable for the "same" object across processes |
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208 # because it is used for sorting. It needn't be unique, though, in cases |
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209 # like nested classes named Foo created by different functions, because |
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210 # equality and hashing is still based on identity. |
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211 # It might be nice to use __qualname__ on Python 3, but that would produce |
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212 # different values between Py2 and Py3. |
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213 return (getattr(ob, '__module__', '?') or '?') + \ |
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214 '.' + (getattr(ob, '__name__', '?') or '?') |
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215 |
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216 def implementedByFallback(cls): |
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217 """Return the interfaces implemented for a class' instances |
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218 |
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219 The value returned is an IDeclaration. |
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220 """ |
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221 try: |
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222 spec = cls.__dict__.get('__implemented__') |
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223 except AttributeError: |
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224 |
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225 # we can't get the class dict. This is probably due to a |
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226 # security proxy. If this is the case, then probably no |
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227 # descriptor was installed for the class. |
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228 |
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229 # We don't want to depend directly on zope.security in |
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230 # zope.interface, but we'll try to make reasonable |
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231 # accommodations in an indirect way. |
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232 |
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233 # We'll check to see if there's an implements: |
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234 |
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235 spec = getattr(cls, '__implemented__', None) |
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236 if spec is None: |
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237 # There's no spec stred in the class. Maybe its a builtin: |
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238 spec = BuiltinImplementationSpecifications.get(cls) |
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239 if spec is not None: |
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240 return spec |
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241 return _empty |
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242 |
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243 if spec.__class__ == Implements: |
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244 # we defaulted to _empty or there was a spec. Good enough. |
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245 # Return it. |
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246 return spec |
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247 |
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248 # TODO: need old style __implements__ compatibility? |
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249 # Hm, there's an __implemented__, but it's not a spec. Must be |
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250 # an old-style declaration. Just compute a spec for it |
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251 return Declaration(*_normalizeargs((spec, ))) |
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252 |
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253 if isinstance(spec, Implements): |
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254 return spec |
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255 |
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256 if spec is None: |
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257 spec = BuiltinImplementationSpecifications.get(cls) |
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258 if spec is not None: |
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259 return spec |
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260 |
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261 # TODO: need old style __implements__ compatibility? |
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262 spec_name = _implements_name(cls) |
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263 if spec is not None: |
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264 # old-style __implemented__ = foo declaration |
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265 spec = (spec, ) # tuplefy, as it might be just an int |
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266 spec = Implements.named(spec_name, *_normalizeargs(spec)) |
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267 spec.inherit = None # old-style implies no inherit |
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268 del cls.__implemented__ # get rid of the old-style declaration |
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269 else: |
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270 try: |
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271 bases = cls.__bases__ |
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272 except AttributeError: |
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273 if not callable(cls): |
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274 raise TypeError("ImplementedBy called for non-factory", cls) |
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275 bases = () |
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276 |
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277 spec = Implements.named(spec_name, *[implementedBy(c) for c in bases]) |
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278 spec.inherit = cls |
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279 |
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280 try: |
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281 cls.__implemented__ = spec |
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282 if not hasattr(cls, '__providedBy__'): |
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283 cls.__providedBy__ = objectSpecificationDescriptor |
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284 |
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285 if (isinstance(cls, DescriptorAwareMetaClasses) |
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286 and |
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287 '__provides__' not in cls.__dict__): |
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288 # Make sure we get a __provides__ descriptor |
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289 cls.__provides__ = ClassProvides( |
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290 cls, |
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291 getattr(cls, '__class__', type(cls)), |
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292 ) |
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293 |
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294 except TypeError: |
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295 if not isinstance(cls, type): |
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296 raise TypeError("ImplementedBy called for non-type", cls) |
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297 BuiltinImplementationSpecifications[cls] = spec |
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298 |
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299 return spec |
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300 |
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301 implementedBy = implementedByFallback |
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302 |
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303 def classImplementsOnly(cls, *interfaces): |
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304 """Declare the only interfaces implemented by instances of a class |
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305 |
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306 The arguments after the class are one or more interfaces or interface |
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307 specifications (``IDeclaration`` objects). |
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308 |
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309 The interfaces given (including the interfaces in the specifications) |
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310 replace any previous declarations. |
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311 """ |
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312 spec = implementedBy(cls) |
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313 spec.declared = () |
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314 spec.inherit = None |
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315 classImplements(cls, *interfaces) |
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316 |
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317 def classImplements(cls, *interfaces): |
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318 """Declare additional interfaces implemented for instances of a class |
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319 |
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320 The arguments after the class are one or more interfaces or |
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321 interface specifications (``IDeclaration`` objects). |
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322 |
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323 The interfaces given (including the interfaces in the specifications) |
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324 are added to any interfaces previously declared. |
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325 """ |
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326 spec = implementedBy(cls) |
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327 spec.declared += tuple(_normalizeargs(interfaces)) |
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328 |
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329 # compute the bases |
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330 bases = [] |
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331 seen = {} |
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332 for b in spec.declared: |
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333 if b not in seen: |
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334 seen[b] = 1 |
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335 bases.append(b) |
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336 |
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337 if spec.inherit is not None: |
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338 |
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339 for c in spec.inherit.__bases__: |
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340 b = implementedBy(c) |
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341 if b not in seen: |
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342 seen[b] = 1 |
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343 bases.append(b) |
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344 |
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345 spec.__bases__ = tuple(bases) |
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346 |
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347 def _implements_advice(cls): |
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348 interfaces, classImplements = cls.__dict__['__implements_advice_data__'] |
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349 del cls.__implements_advice_data__ |
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350 classImplements(cls, *interfaces) |
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351 return cls |
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352 |
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353 |
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354 class implementer: |
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355 """Declare the interfaces implemented by instances of a class. |
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356 |
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357 This function is called as a class decorator. |
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358 |
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359 The arguments are one or more interfaces or interface |
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360 specifications (IDeclaration objects). |
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361 |
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362 The interfaces given (including the interfaces in the |
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363 specifications) are added to any interfaces previously |
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364 declared. |
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365 |
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366 Previous declarations include declarations for base classes |
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367 unless implementsOnly was used. |
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368 |
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369 This function is provided for convenience. It provides a more |
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370 convenient way to call classImplements. For example:: |
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371 |
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372 @implementer(I1) |
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373 class C(object): |
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374 pass |
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375 |
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376 is equivalent to calling:: |
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377 |
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378 classImplements(C, I1) |
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379 |
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380 after the class has been created. |
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381 """ |
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382 |
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383 def __init__(self, *interfaces): |
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384 self.interfaces = interfaces |
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385 |
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386 def __call__(self, ob): |
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387 if isinstance(ob, DescriptorAwareMetaClasses): |
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388 classImplements(ob, *self.interfaces) |
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389 return ob |
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390 |
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391 spec_name = _implements_name(ob) |
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392 spec = Implements.named(spec_name, *self.interfaces) |
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393 try: |
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394 ob.__implemented__ = spec |
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395 except AttributeError: |
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396 raise TypeError("Can't declare implements", ob) |
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397 return ob |
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398 |
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399 class implementer_only: |
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400 """Declare the only interfaces implemented by instances of a class |
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401 |
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402 This function is called as a class decorator. |
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403 |
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404 The arguments are one or more interfaces or interface |
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405 specifications (IDeclaration objects). |
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406 |
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407 Previous declarations including declarations for base classes |
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408 are overridden. |
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409 |
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410 This function is provided for convenience. It provides a more |
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411 convenient way to call classImplementsOnly. For example:: |
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|
412 |
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413 @implementer_only(I1) |
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414 class C(object): pass |
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|
415 |
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416 is equivalent to calling:: |
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|
417 |
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418 classImplementsOnly(I1) |
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419 |
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420 after the class has been created. |
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421 """ |
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|
422 |
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423 def __init__(self, *interfaces): |
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424 self.interfaces = interfaces |
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425 |
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426 def __call__(self, ob): |
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427 if isinstance(ob, (FunctionType, MethodType)): |
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428 # XXX Does this decorator make sense for anything but classes? |
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429 # I don't think so. There can be no inheritance of interfaces |
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430 # on a method pr function.... |
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431 raise ValueError('The implementer_only decorator is not ' |
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|
432 'supported for methods or functions.') |
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433 else: |
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434 # Assume it's a class: |
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|
435 classImplementsOnly(ob, *self.interfaces) |
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|
436 return ob |
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|
437 |
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|
438 def _implements(name, interfaces, classImplements): |
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|
439 # This entire approach is invalid under Py3K. Don't even try to fix |
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|
440 # the coverage for this block there. :( |
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|
441 frame = sys._getframe(2) |
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442 locals = frame.f_locals |
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|
443 |
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444 # Try to make sure we were called from a class def. In 2.2.0 we can't |
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445 # check for __module__ since it doesn't seem to be added to the locals |
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446 # until later on. |
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447 if locals is frame.f_globals or '__module__' not in locals: |
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|
448 raise TypeError(name+" can be used only from a class definition.") |
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|
449 |
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|
450 if '__implements_advice_data__' in locals: |
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|
451 raise TypeError(name+" can be used only once in a class definition.") |
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|
452 |
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|
453 locals['__implements_advice_data__'] = interfaces, classImplements |
37179
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thirdparty: allow zope.interface.advice to be lazily imported
Gregory Szorc <gregory.szorc@gmail.com>
parents:
37178
diff
changeset
|
454 advicemod.addClassAdvisor(_implements_advice, depth=3) |
37176
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|
455 |
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|
456 def implements(*interfaces): |
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|
457 """Declare interfaces implemented by instances of a class |
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parents:
diff
changeset
|
458 |
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parents:
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changeset
|
459 This function is called in a class definition. |
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
460 |
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
461 The arguments are one or more interfaces or interface |
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
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|
462 specifications (IDeclaration objects). |
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
463 |
943d77fc07a3
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
464 The interfaces given (including the interfaces in the |
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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|
465 specifications) are added to any interfaces previously |
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
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|
466 declared. |
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
467 |
943d77fc07a3
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
468 Previous declarations include declarations for base classes |
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
469 unless implementsOnly was used. |
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
470 |
943d77fc07a3
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
471 This function is provided for convenience. It provides a more |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
472 convenient way to call classImplements. For example:: |
943d77fc07a3
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
473 |
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
474 implements(I1) |
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
475 |
943d77fc07a3
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
476 is equivalent to calling:: |
943d77fc07a3
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
477 |
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
478 classImplements(C, I1) |
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
479 |
943d77fc07a3
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
480 after the class has been created. |
943d77fc07a3
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
481 """ |
943d77fc07a3
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
482 # This entire approach is invalid under Py3K. Don't even try to fix |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
483 # the coverage for this block there. :( |
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
484 if PYTHON3: |
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485 raise TypeError(_ADVICE_ERROR % 'implementer') |
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486 _implements("implements", interfaces, classImplements) |
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487 |
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488 def implementsOnly(*interfaces): |
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489 """Declare the only interfaces implemented by instances of a class |
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490 |
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491 This function is called in a class definition. |
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492 |
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493 The arguments are one or more interfaces or interface |
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494 specifications (IDeclaration objects). |
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495 |
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496 Previous declarations including declarations for base classes |
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497 are overridden. |
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498 |
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499 This function is provided for convenience. It provides a more |
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500 convenient way to call classImplementsOnly. For example:: |
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501 |
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502 implementsOnly(I1) |
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503 |
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504 is equivalent to calling:: |
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505 |
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506 classImplementsOnly(I1) |
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507 |
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508 after the class has been created. |
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509 """ |
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510 # This entire approach is invalid under Py3K. Don't even try to fix |
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511 # the coverage for this block there. :( |
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512 if PYTHON3: |
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513 raise TypeError(_ADVICE_ERROR % 'implementer_only') |
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514 _implements("implementsOnly", interfaces, classImplementsOnly) |
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515 |
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516 ############################################################################## |
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517 # |
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518 # Instance declarations |
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519 |
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520 class Provides(Declaration): # Really named ProvidesClass |
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521 """Implement __provides__, the instance-specific specification |
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522 |
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523 When an object is pickled, we pickle the interfaces that it implements. |
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524 """ |
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|
525 |
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526 def __init__(self, cls, *interfaces): |
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527 self.__args = (cls, ) + interfaces |
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528 self._cls = cls |
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529 Declaration.__init__(self, *(interfaces + (implementedBy(cls), ))) |
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530 |
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531 def __reduce__(self): |
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532 return Provides, self.__args |
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533 |
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534 __module__ = 'zope.interface' |
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|
535 |
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536 def __get__(self, inst, cls): |
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537 """Make sure that a class __provides__ doesn't leak to an instance |
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538 """ |
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539 if inst is None and cls is self._cls: |
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|
540 # We were accessed through a class, so we are the class' |
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541 # provides spec. Just return this object, but only if we are |
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542 # being called on the same class that we were defined for: |
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|
543 return self |
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|
544 |
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|
545 raise AttributeError('__provides__') |
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|
546 |
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|
547 ProvidesClass = Provides |
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diff
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|
548 |
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549 # Registry of instance declarations |
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|
550 # This is a memory optimization to allow objects to share specifications. |
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551 InstanceDeclarations = weakref.WeakValueDictionary() |
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diff
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|
552 |
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|
553 def Provides(*interfaces): |
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|
554 """Cache instance declarations |
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parents:
diff
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|
555 |
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parents:
diff
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|
556 Instance declarations are shared among instances that have the same |
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parents:
diff
changeset
|
557 declaration. The declarations are cached in a weak value dictionary. |
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558 """ |
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|
559 spec = InstanceDeclarations.get(interfaces) |
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|
560 if spec is None: |
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|
561 spec = ProvidesClass(*interfaces) |
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|
562 InstanceDeclarations[interfaces] = spec |
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diff
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|
563 |
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diff
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|
564 return spec |
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parents:
diff
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|
565 |
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parents:
diff
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|
566 Provides.__safe_for_unpickling__ = True |
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thirdparty: vendor zope.interface 4.4.3
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|
567 |
943d77fc07a3
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
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|
568 |
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
569 def directlyProvides(object, *interfaces): |
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diff
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|
570 """Declare interfaces declared directly for an object |
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|
571 |
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parents:
diff
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|
572 The arguments after the object are one or more interfaces or interface |
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|
573 specifications (``IDeclaration`` objects). |
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parents:
diff
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|
574 |
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parents:
diff
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|
575 The interfaces given (including the interfaces in the specifications) |
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576 replace interfaces previously declared for the object. |
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diff
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|
577 """ |
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|
578 cls = getattr(object, '__class__', None) |
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|
579 if cls is not None and getattr(cls, '__class__', None) is cls: |
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580 # It's a meta class (well, at least it it could be an extension class) |
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|
581 # Note that we can't get here from Py3k tests: there is no normal |
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|
582 # class which isn't descriptor aware. |
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|
583 if not isinstance(object, |
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diff
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|
584 DescriptorAwareMetaClasses): |
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|
585 raise TypeError("Attempt to make an interface declaration on a " |
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|
586 "non-descriptor-aware class") |
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|
587 |
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diff
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|
588 interfaces = _normalizeargs(interfaces) |
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parents:
diff
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|
589 if cls is None: |
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parents:
diff
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|
590 cls = type(object) |
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parents:
diff
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|
591 |
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parents:
diff
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|
592 issub = False |
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parents:
diff
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|
593 for damc in DescriptorAwareMetaClasses: |
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diff
changeset
|
594 if issubclass(cls, damc): |
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diff
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|
595 issub = True |
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parents:
diff
changeset
|
596 break |
943d77fc07a3
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parents:
diff
changeset
|
597 if issub: |
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parents:
diff
changeset
|
598 # we have a class or type. We'll use a special descriptor |
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parents:
diff
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|
599 # that provides some extra caching |
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parents:
diff
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|
600 object.__provides__ = ClassProvides(object, cls, *interfaces) |
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parents:
diff
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|
601 else: |
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
602 object.__provides__ = Provides(cls, *interfaces) |
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parents:
diff
changeset
|
603 |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
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parents:
diff
changeset
|
604 |
943d77fc07a3
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parents:
diff
changeset
|
605 def alsoProvides(object, *interfaces): |
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
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|
606 """Declare interfaces declared directly for an object |
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parents:
diff
changeset
|
607 |
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
608 The arguments after the object are one or more interfaces or interface |
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
609 specifications (``IDeclaration`` objects). |
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
610 |
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
611 The interfaces given (including the interfaces in the specifications) are |
943d77fc07a3
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
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612 added to the interfaces previously declared for the object. |
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thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
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|
613 """ |
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
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|
614 directlyProvides(object, directlyProvidedBy(object), *interfaces) |
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parents:
diff
changeset
|
615 |
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parents:
diff
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|
616 def noLongerProvides(object, interface): |
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
617 """ Removes a directly provided interface from an object. |
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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618 """ |
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
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|
619 directlyProvides(object, directlyProvidedBy(object) - interface) |
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parents:
diff
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|
620 if interface.providedBy(object): |
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diff
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|
621 raise ValueError("Can only remove directly provided interfaces.") |
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
622 |
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parents:
diff
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|
623 class ClassProvidesBaseFallback(object): |
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
624 |
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
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|
625 def __get__(self, inst, cls): |
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Gregory Szorc <gregory.szorc@gmail.com>
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626 if cls is self._cls: |
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
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|
627 # We only work if called on the class we were defined for |
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
628 |
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parents:
diff
changeset
|
629 if inst is None: |
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
630 # We were accessed through a class, so we are the class' |
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
631 # provides spec. Just return this object as is: |
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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632 return self |
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
633 |
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Gregory Szorc <gregory.szorc@gmail.com>
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634 return self._implements |
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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changeset
|
635 |
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Gregory Szorc <gregory.szorc@gmail.com>
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|
636 raise AttributeError('__provides__') |
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
637 |
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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|
638 ClassProvidesBasePy = ClassProvidesBaseFallback # BBB |
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
639 ClassProvidesBase = ClassProvidesBaseFallback |
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
640 |
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
641 # Try to get C base: |
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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|
642 try: |
37208
b9dd8403d8ff
zope: force module import by importing symbols
Gregory Szorc <gregory.szorc@gmail.com>
parents:
37179
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|
643 from ._zope_interface_coptimizations import ClassProvidesBase |
37176
943d77fc07a3
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
644 except ImportError: |
943d77fc07a3
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
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|
645 pass |
943d77fc07a3
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
646 |
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parents:
diff
changeset
|
647 class ClassProvides(Declaration, ClassProvidesBase): |
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
648 """Special descriptor for class __provides__ |
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
649 |
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
650 The descriptor caches the implementedBy info, so that |
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thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
651 we can get declarations for objects without instance-specific |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
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652 interfaces a bit quicker. |
943d77fc07a3
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parents:
diff
changeset
|
653 """ |
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parents:
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|
654 def __init__(self, cls, metacls, *interfaces): |
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parents:
diff
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|
655 self._cls = cls |
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
656 self._implements = implementedBy(cls) |
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Gregory Szorc <gregory.szorc@gmail.com>
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657 self.__args = (cls, metacls, ) + interfaces |
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658 Declaration.__init__(self, *(interfaces + (implementedBy(metacls), ))) |
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parents:
diff
changeset
|
659 |
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parents:
diff
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|
660 def __reduce__(self): |
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
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661 return self.__class__, self.__args |
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parents:
diff
changeset
|
662 |
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parents:
diff
changeset
|
663 # Copy base-class method for speed |
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parents:
diff
changeset
|
664 __get__ = ClassProvidesBase.__get__ |
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
665 |
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parents:
diff
changeset
|
666 def directlyProvidedBy(object): |
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parents:
diff
changeset
|
667 """Return the interfaces directly provided by the given object |
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
668 |
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thirdparty: vendor zope.interface 4.4.3
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parents:
diff
changeset
|
669 The value returned is an ``IDeclaration``. |
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
670 """ |
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parents:
diff
changeset
|
671 provides = getattr(object, "__provides__", None) |
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parents:
diff
changeset
|
672 if (provides is None # no spec |
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parents:
diff
changeset
|
673 or |
943d77fc07a3
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
674 # We might have gotten the implements spec, as an |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
675 # optimization. If so, it's like having only one base, that we |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
676 # lop off to exclude class-supplied declarations: |
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
677 isinstance(provides, Implements) |
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parents:
diff
changeset
|
678 ): |
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
679 return _empty |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
680 |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
681 # Strip off the class part of the spec: |
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parents:
diff
changeset
|
682 return Declaration(provides.__bases__[:-1]) |
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
683 |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
684 def classProvides(*interfaces): |
943d77fc07a3
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
685 """Declare interfaces provided directly by a class |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
686 |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
687 This function is called in a class definition. |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
688 |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
689 The arguments are one or more interfaces or interface specifications |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
690 (``IDeclaration`` objects). |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
691 |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
692 The given interfaces (including the interfaces in the specifications) |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
693 are used to create the class's direct-object interface specification. |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
694 An error will be raised if the module class has an direct interface |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
695 specification. In other words, it is an error to call this function more |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
696 than once in a class definition. |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
697 |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
698 Note that the given interfaces have nothing to do with the interfaces |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
699 implemented by instances of the class. |
943d77fc07a3
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
700 |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
701 This function is provided for convenience. It provides a more convenient |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
702 way to call directlyProvides for a class. For example:: |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
703 |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
704 classProvides(I1) |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
705 |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
706 is equivalent to calling:: |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
707 |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
708 directlyProvides(theclass, I1) |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
709 |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
710 after the class has been created. |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
711 """ |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
712 # This entire approach is invalid under Py3K. Don't even try to fix |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
713 # the coverage for this block there. :( |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
714 |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
715 if PYTHON3: |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
716 raise TypeError(_ADVICE_ERROR % 'provider') |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
717 |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
718 frame = sys._getframe(1) |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
719 locals = frame.f_locals |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
720 |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
721 # Try to make sure we were called from a class def |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
722 if (locals is frame.f_globals) or ('__module__' not in locals): |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
723 raise TypeError("classProvides can be used only from a " |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
724 "class definition.") |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
725 |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
726 if '__provides__' in locals: |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
727 raise TypeError( |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
728 "classProvides can only be used once in a class definition.") |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
729 |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
730 locals["__provides__"] = _normalizeargs(interfaces) |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
731 |
37179
49630e75635d
thirdparty: allow zope.interface.advice to be lazily imported
Gregory Szorc <gregory.szorc@gmail.com>
parents:
37178
diff
changeset
|
732 advicemod.addClassAdvisor(_classProvides_advice, depth=2) |
37176
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
733 |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
734 def _classProvides_advice(cls): |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
735 # This entire approach is invalid under Py3K. Don't even try to fix |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
736 # the coverage for this block there. :( |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
737 interfaces = cls.__dict__['__provides__'] |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
738 del cls.__provides__ |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
739 directlyProvides(cls, *interfaces) |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
740 return cls |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
741 |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
742 class provider: |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
743 """Class decorator version of classProvides""" |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
744 |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
745 def __init__(self, *interfaces): |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
746 self.interfaces = interfaces |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
747 |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
748 def __call__(self, ob): |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
749 directlyProvides(ob, *self.interfaces) |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
750 return ob |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
751 |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
752 def moduleProvides(*interfaces): |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
753 """Declare interfaces provided by a module |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
754 |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
755 This function is used in a module definition. |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
756 |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
757 The arguments are one or more interfaces or interface specifications |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
758 (``IDeclaration`` objects). |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
759 |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
760 The given interfaces (including the interfaces in the specifications) are |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
761 used to create the module's direct-object interface specification. An |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
762 error will be raised if the module already has an interface specification. |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
763 In other words, it is an error to call this function more than once in a |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
764 module definition. |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
765 |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
766 This function is provided for convenience. It provides a more convenient |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
767 way to call directlyProvides. For example:: |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
768 |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
769 moduleImplements(I1) |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
770 |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
771 is equivalent to:: |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
772 |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
773 directlyProvides(sys.modules[__name__], I1) |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
774 """ |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
775 frame = sys._getframe(1) |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
776 locals = frame.f_locals |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
777 |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
778 # Try to make sure we were called from a class def |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
779 if (locals is not frame.f_globals) or ('__name__' not in locals): |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
780 raise TypeError( |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
781 "moduleProvides can only be used from a module definition.") |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
782 |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
783 if '__provides__' in locals: |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
784 raise TypeError( |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
785 "moduleProvides can only be used once in a module definition.") |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
786 |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
787 locals["__provides__"] = Provides(ModuleType, |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
788 *_normalizeargs(interfaces)) |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
789 |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
790 ############################################################################## |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
791 # |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
792 # Declaration querying support |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
793 |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
794 # XXX: is this a fossil? Nobody calls it, no unit tests exercise it, no |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
795 # doctests import it, and the package __init__ doesn't import it. |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
796 def ObjectSpecification(direct, cls): |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
797 """Provide object specifications |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
798 |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
799 These combine information for the object and for it's classes. |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
800 """ |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
801 return Provides(cls, direct) # pragma: no cover fossil |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
802 |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
803 def getObjectSpecificationFallback(ob): |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
804 |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
805 provides = getattr(ob, '__provides__', None) |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
806 if provides is not None: |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
807 if isinstance(provides, SpecificationBase): |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
808 return provides |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
809 |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
810 try: |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
811 cls = ob.__class__ |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
812 except AttributeError: |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
813 # We can't get the class, so just consider provides |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
814 return _empty |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
815 |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
816 return implementedBy(cls) |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
817 |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
818 getObjectSpecification = getObjectSpecificationFallback |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
819 |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
820 def providedByFallback(ob): |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
821 |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
822 # Here we have either a special object, an old-style declaration |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
823 # or a descriptor |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
824 |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
825 # Try to get __providedBy__ |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
826 try: |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
827 r = ob.__providedBy__ |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
828 except AttributeError: |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
829 # Not set yet. Fall back to lower-level thing that computes it |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
830 return getObjectSpecification(ob) |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
831 |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
832 try: |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
833 # We might have gotten a descriptor from an instance of a |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
834 # class (like an ExtensionClass) that doesn't support |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
835 # descriptors. We'll make sure we got one by trying to get |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
836 # the only attribute, which all specs have. |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
837 r.extends |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
838 |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
839 except AttributeError: |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
840 |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
841 # The object's class doesn't understand descriptors. |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
842 # Sigh. We need to get an object descriptor, but we have to be |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
843 # careful. We want to use the instance's __provides__, if |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
844 # there is one, but only if it didn't come from the class. |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
845 |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
846 try: |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
847 r = ob.__provides__ |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
848 except AttributeError: |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
849 # No __provides__, so just fall back to implementedBy |
943d77fc07a3
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
850 return implementedBy(ob.__class__) |
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thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
851 |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
852 # We need to make sure we got the __provides__ from the |
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thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
853 # instance. We'll do this by making sure we don't get the same |
943d77fc07a3
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
854 # thing from the class: |
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thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
855 |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
856 try: |
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thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
857 cp = ob.__class__.__provides__ |
943d77fc07a3
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
858 except AttributeError: |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
859 # The ob doesn't have a class or the class has no |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
860 # provides, assume we're done: |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
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|
861 return r |
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thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
862 |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
863 if r is cp: |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
864 # Oops, we got the provides from the class. This means |
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thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
865 # the object doesn't have it's own. We should use implementedBy |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
866 return implementedBy(ob.__class__) |
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
867 |
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thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
868 return r |
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thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
869 providedBy = providedByFallback |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
870 |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
871 class ObjectSpecificationDescriptorFallback(object): |
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Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
872 """Implement the `__providedBy__` attribute |
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thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
873 |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
874 The `__providedBy__` attribute computes the interfaces peovided by |
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thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
875 an object. |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
876 """ |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
877 |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
878 def __get__(self, inst, cls): |
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thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
879 """Get an object specification for an object |
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thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
880 """ |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
881 if inst is None: |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
882 return getObjectSpecification(cls) |
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thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
883 |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
884 provides = getattr(inst, '__provides__', None) |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
885 if provides is not None: |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
886 return provides |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
887 |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
888 return implementedBy(cls) |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
889 |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
890 ObjectSpecificationDescriptor = ObjectSpecificationDescriptorFallback |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
891 |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
892 ############################################################################## |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
893 |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
894 def _normalizeargs(sequence, output = None): |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
895 """Normalize declaration arguments |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
896 |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
897 Normalization arguments might contain Declarions, tuples, or single |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
898 interfaces. |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
899 |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
900 Anything but individial interfaces or implements specs will be expanded. |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
901 """ |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
902 if output is None: |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
903 output = [] |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
904 |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
905 cls = sequence.__class__ |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
906 if InterfaceClass in cls.__mro__ or Implements in cls.__mro__: |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
907 output.append(sequence) |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
908 else: |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
909 for v in sequence: |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
910 _normalizeargs(v, output) |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
911 |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
912 return output |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
913 |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
914 _empty = Declaration() |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
915 |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
916 try: |
37208
b9dd8403d8ff
zope: force module import by importing symbols
Gregory Szorc <gregory.szorc@gmail.com>
parents:
37179
diff
changeset
|
917 from ._zope_interface_coptimizations import ( |
b9dd8403d8ff
zope: force module import by importing symbols
Gregory Szorc <gregory.szorc@gmail.com>
parents:
37179
diff
changeset
|
918 getObjectSpecification, |
b9dd8403d8ff
zope: force module import by importing symbols
Gregory Szorc <gregory.szorc@gmail.com>
parents:
37179
diff
changeset
|
919 implementedBy, |
b9dd8403d8ff
zope: force module import by importing symbols
Gregory Szorc <gregory.szorc@gmail.com>
parents:
37179
diff
changeset
|
920 ObjectSpecificationDescriptor, |
b9dd8403d8ff
zope: force module import by importing symbols
Gregory Szorc <gregory.szorc@gmail.com>
parents:
37179
diff
changeset
|
921 providedBy, |
b9dd8403d8ff
zope: force module import by importing symbols
Gregory Szorc <gregory.szorc@gmail.com>
parents:
37179
diff
changeset
|
922 ) |
37176
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
923 except ImportError: |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
924 pass |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
925 |
943d77fc07a3
thirdparty: vendor zope.interface 4.4.3
Gregory Szorc <gregory.szorc@gmail.com>
parents:
diff
changeset
|
926 objectSpecificationDescriptor = ObjectSpecificationDescriptor() |