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authorMike Taylor <bear42@gmail.com>2015-09-18 15:11:47 -0400
committerMike Taylor <bear42@gmail.com>2015-09-18 15:11:47 -0400
commit5525ef22851d42246782fa0adf1dc2b40e493840 (patch)
tree276bd6aab21a1528b7bac772428182fb4b400ca7 /sleekxmpp/thirdparty/orderedset.py
parentda14ce16ec564a11394dc0ee6ee446a4dfa97a5d (diff)
parent0b14ef82d4058925e7e9db22038777d4654e8199 (diff)
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Merge pull request #395 from rerobins/refactor_forms
XEP_0004: Data Forms use register_stanza_plugin
Diffstat (limited to 'sleekxmpp/thirdparty/orderedset.py')
-rw-r--r--sleekxmpp/thirdparty/orderedset.py89
1 files changed, 89 insertions, 0 deletions
diff --git a/sleekxmpp/thirdparty/orderedset.py b/sleekxmpp/thirdparty/orderedset.py
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+# Copyright (c) 2009 Raymond Hettinger
+#
+# Permission is hereby granted, free of charge, to any person
+# obtaining a copy of this software and associated documentation files
+# (the "Software"), to deal in the Software without restriction,
+# including without limitation the rights to use, copy, modify, merge,
+# publish, distribute, sublicense, and/or sell copies of the Software,
+# and to permit persons to whom the Software is furnished to do so,
+# subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be
+# included in all copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+# OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+# HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+# WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+# FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+# OTHER DEALINGS IN THE SOFTWARE.
+
+import collections
+
+class OrderedSet(collections.MutableSet):
+
+ def __init__(self, iterable=None):
+ self.end = end = []
+ end += [None, end, end] # sentinel node for doubly linked list
+ self.map = {} # key --> [key, prev, next]
+ if iterable is not None:
+ self |= iterable
+
+ def __len__(self):
+ return len(self.map)
+
+ def __contains__(self, key):
+ return key in self.map
+
+ def add(self, key):
+ if key not in self.map:
+ end = self.end
+ curr = end[1]
+ curr[2] = end[1] = self.map[key] = [key, curr, end]
+
+ def discard(self, key):
+ if key in self.map:
+ key, prev, next = self.map.pop(key)
+ prev[2] = next
+ next[1] = prev
+
+ def __iter__(self):
+ end = self.end
+ curr = end[2]
+ while curr is not end:
+ yield curr[0]
+ curr = curr[2]
+
+ def __reversed__(self):
+ end = self.end
+ curr = end[1]
+ while curr is not end:
+ yield curr[0]
+ curr = curr[1]
+
+ def pop(self, last=True):
+ if not self:
+ raise KeyError('set is empty')
+ key = self.end[1][0] if last else self.end[2][0]
+ self.discard(key)
+ return key
+
+ def __repr__(self):
+ if not self:
+ return '%s()' % (self.__class__.__name__,)
+ return '%s(%r)' % (self.__class__.__name__, list(self))
+
+ def __eq__(self, other):
+ if isinstance(other, OrderedSet):
+ return len(self) == len(other) and list(self) == list(other)
+ return set(self) == set(other)
+
+
+if __name__ == '__main__':
+ s = OrderedSet('abracadaba')
+ t = OrderedSet('simsalabim')
+ print(s | t)
+ print(s & t)
+ print(s - t) \ No newline at end of file