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#._cv_part guppy.sets

from setsc import BitSet	# base bitset type
from setsc import ImmBitSet	# immutable bitset type
from setsc import immbit	# immutable bitset singleton constructor
from setsc import immbitrange	# immutable bitset range constructor
from setsc import immbitset	# immutable bitset constructor
from setsc import MutBitSet	# mutable bitset
from setsc import NodeSet	# base nodeset type
from setsc import ImmNodeSet	# immmutable nodeset type
from setsc import MutNodeSet	# mutable nodeset type

import copy_reg
from setsc import _bs
if hasattr(copy_reg, 'safe_constructors'):	# < 2.3 version
    copy_reg.safe_constructors[_bs] = 1
else:
    # In at least Python 2.3.3, we have to set __module__;
    # it didn't find it otherwise.
    _bs.__module__	# Due to bug in Python version 2.3.3, we have to read it first..
    _bs.__module__= 'guppy.sets' # ..to be able to set it.
del copy_reg


# Define some constructors.
# Constructor names are lower case.
# Some constructors are equal to types.
# But this connection depends on the implementation.
# So one may wish the user to not depend on this.

mutbitset = MutBitSet
immnodeset = ImmNodeSet
mutnodeset = MutNodeSet

def mutnodeset_union(iterable):
    "Return a mutable nodeset which is the union of all nodesets in iterable."
    set = mutnodeset()
    for it in iterable:
	set |= it
    return set

def immnodeset_union(iterable, *args):
    "Return an immmutable nodeset which is the union of all nodesets in iterable."
    set = mutnodeset_union(iterable)
    return immnodeset(set, *args)

def laxnodeset(v):
    """\
Return a nodeset with elements from the argument.  If the argument is
already a nodeset, it self will be returned. Otherwise it will be
converted to a nodeset, that can be mutable or immutable depending on
what happens to be most effectively implemented."""
    
    if not isinstance(v, NodeSet):
	v = immnodeset(v)
    return v

# Make attributes assignable by reading one;
# this is getting around a bug in Python 2.3.3
# and should be harmless in any version.

try:
    mutnodeset()._hiding_tag_
except AttributeError:
    pass