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# pylint: disable-msg=E0601,W0622,W0611
#
# Copyright (c) 2004-2006 LOGILAB S.A. (Paris, FRANCE).
# http://www.logilab.fr/ -- mailto:contact@logilab.fr
#
# This program is free software; you can redistribute it and/or modify it under
# the terms of the GNU General Public License as published by the Free Software
# Foundation; either version 2 of the License, or (at your option) any later
# version.
#
# This program is distributed in the hope that it will be useful, but WITHOUT
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
# FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details
#
# You should have received a copy of the GNU General Public License along with
# this program; if not, write to the Free Software Foundation, Inc.,
# 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
"""some wrapper around tools introduced into python 2.3, making them available
in python 2.2
"""
from __future__ import generators
from warnings import warn
from logilab.common.deprecation import class_renamed
try:
set = set
frozenset = frozenset
except NameError:
try:
from sets import Set as set, ImmutableSet as frozenset
except ImportError:
class _baseset(object):
def __init__(self, values=()):
self._data = {}
warn("This implementation of Set is not complete !",
stacklevel=2)
for v in values:
self._data[v] = 1
def __or__(self, other):
result = self.__class__(self._data.keys())
for val in other:
result.add(val)
return result
__add__ = __or__
def __and__(self, other):
result = self.__class__()
for val in other:
if val in self._data:
result.add(val)
return result
def __sub__(self, other):
result = self.__class__(self._data.keys())
for val in other:
if val in self._data:
result.remove(val)
return result
def __cmp__(self, other):
keys = self._data.keys()
okeys = other._data.keys()
keys.sort()
okeys.sort()
return cmp(keys, okeys)
def __len__(self):
return len(self._data)
def __repr__(self):
elements = self._data.keys()
return 'lcc.%s(%r)' % (self.__class__.__name__, elements)
__str__ = __repr__
def __iter__(self):
return iter(self._data)
class frozenset(_baseset):
"""immutable set (can be set in dictionnaries)"""
def __init__(self, values=()):
super(frozenset, self).__init__(values)
self._hashcode = None
def _compute_hash(self):
"""taken from python stdlib (sets.py)"""
# Calculate hash code for a set by xor'ing the hash codes of
# the elements. This ensures that the hash code does not depend
# on the order in which elements are added to the set. This is
# not called __hash__ because a BaseSet should not be hashable;
# only an ImmutableSet is hashable.
result = 0
for elt in self:
result ^= hash(elt)
return result
def __hash__(self):
"""taken from python stdlib (sets.py)"""
if self._hashcode is None:
self._hashcode = self._compute_hash()
return self._hashcode
class set(_baseset):
"""mutable set"""
def add(self, value):
self._data[value] = 1
def remove(self, element):
"""removes <element> from set"""
del self._data[element]
def pop(self):
"""pops an arbitrary element from set"""
return self._data.popitem()[0]
def __hash__(self):
"""mutable et cannot be hashed."""
raise TypeError("set objects are not hashable")
del _baseset # don't explicity provide this class
Set = class_renamed('Set', set, 'logilab.common.compat.Set is deprecated, '
'use logilab.common.compat.set instead')
try:
from itertools import izip, chain, imap
except ImportError:
# from itertools documentation ###
def izip(*iterables):
iterables = map(iter, iterables)
while iterables:
result = [i.next() for i in iterables]
yield tuple(result)
def chain(*iterables):
for it in iterables:
for element in it:
yield element
def imap(function, *iterables):
iterables = map(iter, iterables)
while True:
args = [i.next() for i in iterables]
if function is None:
yield tuple(args)
else:
yield function(*args)
try:
sum = sum
enumerate = enumerate
except NameError:
# define the sum and enumerate functions (builtins introduced in py 2.3)
import operator
def sum(seq, start=0):
"""Returns the sum of all elements in the sequence"""
return reduce(operator.add, seq, start)
def enumerate(iterable):
"""emulates the python2.3 enumerate() function"""
i = 0
for val in iterable:
yield i, val
i += 1
#return zip(range(len(iterable)), iterable)
try:
sorted = sorted
reversed = reversed
except NameError:
def sorted(iterable, cmp=None, key=None, reverse=False):
original = list(iterable)
if key:
l2 = [(key(elt), index) for index, elt in enumerate(original)]
else:
l2 = original
l2.sort(cmp)
if reverse:
l2.reverse()
if key:
return [original[index] for elt, index in l2]
return l2
def reversed(l):
l2 = list(l)
l2.reverse()
return l2
# Python2.5 builtins
try:
any = any
all = all
except NameError:
def any(iterable):
"""any(iterable) -> bool
Return True if bool(x) is True for any x in the iterable.
"""
for elt in iterable:
if elt:
return True
return False
def all(iterable):
"""all(iterable) -> bool
Return True if bool(x) is True for all values x in the iterable.
"""
for elt in iterable:
if not elt:
return False
return True
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