--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/mercurial/thirdparty/zope/interface/common/mapping.py Wed Mar 21 19:48:50 2018 -0700
@@ -0,0 +1,125 @@
+##############################################################################
+#
+# Copyright (c) 2001, 2002 Zope Foundation and Contributors.
+# All Rights Reserved.
+#
+# This software is subject to the provisions of the Zope Public License,
+# Version 2.1 (ZPL). A copy of the ZPL should accompany this distribution.
+# THIS SOFTWARE IS PROVIDED "AS IS" AND ANY AND ALL EXPRESS OR IMPLIED
+# WARRANTIES ARE DISCLAIMED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+# WARRANTIES OF TITLE, MERCHANTABILITY, AGAINST INFRINGEMENT, AND FITNESS
+# FOR A PARTICULAR PURPOSE.
+#
+##############################################################################
+"""Mapping Interfaces
+"""
+from zope.interface import Interface
+
+class IItemMapping(Interface):
+ """Simplest readable mapping object
+ """
+
+ def __getitem__(key):
+ """Get a value for a key
+
+ A KeyError is raised if there is no value for the key.
+ """
+
+
+class IReadMapping(IItemMapping):
+ """Basic mapping interface
+ """
+
+ def get(key, default=None):
+ """Get a value for a key
+
+ The default is returned if there is no value for the key.
+ """
+
+ def __contains__(key):
+ """Tell if a key exists in the mapping."""
+
+
+class IWriteMapping(Interface):
+ """Mapping methods for changing data"""
+
+ def __delitem__(key):
+ """Delete a value from the mapping using the key."""
+
+ def __setitem__(key, value):
+ """Set a new item in the mapping."""
+
+
+class IEnumerableMapping(IReadMapping):
+ """Mapping objects whose items can be enumerated.
+ """
+
+ def keys():
+ """Return the keys of the mapping object.
+ """
+
+ def __iter__():
+ """Return an iterator for the keys of the mapping object.
+ """
+
+ def values():
+ """Return the values of the mapping object.
+ """
+
+ def items():
+ """Return the items of the mapping object.
+ """
+
+ def __len__():
+ """Return the number of items.
+ """
+
+class IMapping(IWriteMapping, IEnumerableMapping):
+ ''' Simple mapping interface '''
+
+class IIterableMapping(IEnumerableMapping):
+
+ def iterkeys():
+ "iterate over keys; equivalent to __iter__"
+
+ def itervalues():
+ "iterate over values"
+
+ def iteritems():
+ "iterate over items"
+
+class IClonableMapping(Interface):
+
+ def copy():
+ "return copy of dict"
+
+class IExtendedReadMapping(IIterableMapping):
+
+ def has_key(key):
+ """Tell if a key exists in the mapping; equivalent to __contains__"""
+
+class IExtendedWriteMapping(IWriteMapping):
+
+ def clear():
+ "delete all items"
+
+ def update(d):
+ " Update D from E: for k in E.keys(): D[k] = E[k]"
+
+ def setdefault(key, default=None):
+ "D.setdefault(k[,d]) -> D.get(k,d), also set D[k]=d if k not in D"
+
+ def pop(k, *args):
+ """remove specified key and return the corresponding value
+ *args may contain a single default value, or may not be supplied.
+ If key is not found, default is returned if given, otherwise
+ KeyError is raised"""
+
+ def popitem():
+ """remove and return some (key, value) pair as a
+ 2-tuple; but raise KeyError if mapping is empty"""
+
+class IFullMapping(
+ IExtendedReadMapping, IExtendedWriteMapping, IClonableMapping, IMapping):
+ ''' Full mapping interface ''' # IMapping included so tests for IMapping
+ # succeed with IFullMapping