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from collections.abc import Set, Hashable
import sys
from pyrsistent._pmap import pmap
class PSet(object):
"""
Persistent set implementation. Built on top of the persistent map. The set supports all operations
in the Set protocol and is Hashable.
Do not instantiate directly, instead use the factory functions :py:func:`s` or :py:func:`pset`
to create an instance.
Random access and insert is log32(n) where n is the size of the set.
Some examples:
>>> s = pset([1, 2, 3, 1])
>>> s2 = s.add(4)
>>> s3 = s2.remove(2)
>>> s
pset([1, 2, 3])
>>> s2
pset([1, 2, 3, 4])
>>> s3
pset([1, 3, 4])
"""
__slots__ = ('_map', '__weakref__')
def __new__(cls, m):
self = super(PSet, cls).__new__(cls)
self._map = m
return self
def __contains__(self, element):
return element in self._map
def __iter__(self):
return iter(self._map)
def __len__(self):
return len(self._map)
def __repr__(self):
if not self:
return 'p' + str(set(self))
return 'pset([{0}])'.format(str(set(self))[1:-1])
def __str__(self):
return self.__repr__()
def __hash__(self):
return hash(self._map)
def __reduce__(self):
# Pickling support
return pset, (list(self),)
@classmethod
def _from_iterable(cls, it, pre_size=8):
return PSet(pmap(dict((k, True) for k in it), pre_size=pre_size))
def add(self, element):
"""
Return a new PSet with element added
>>> s1 = s(1, 2)
>>> s1.add(3)
pset([1, 2, 3])
"""
return self.evolver().add(element).persistent()
def update(self, iterable):
"""
Return a new PSet with elements in iterable added
>>> s1 = s(1, 2)
>>> s1.update([3, 4, 4])
pset([1, 2, 3, 4])
"""
e = self.evolver()
for element in iterable:
e.add(element)
return e.persistent()
def remove(self, element):
"""
Return a new PSet with element removed. Raises KeyError if element is not present.
>>> s1 = s(1, 2)
>>> s1.remove(2)
pset([1])
"""
if element in self._map:
return self.evolver().remove(element).persistent()
raise KeyError("Element '%s' not present in PSet" % repr(element))
def discard(self, element):
"""
Return a new PSet with element removed. Returns itself if element is not present.
"""
if element in self._map:
return self.evolver().remove(element).persistent()
return self
class _Evolver(object):
__slots__ = ('_original_pset', '_pmap_evolver')
def __init__(self, original_pset):
self._original_pset = original_pset
self._pmap_evolver = original_pset._map.evolver()
def add(self, element):
self._pmap_evolver[element] = True
return self
def remove(self, element):
del self._pmap_evolver[element]
return self
def is_dirty(self):
return self._pmap_evolver.is_dirty()
def persistent(self):
if not self.is_dirty():
return self._original_pset
return PSet(self._pmap_evolver.persistent())
def __len__(self):
return len(self._pmap_evolver)
def copy(self):
return self
def evolver(self):
"""
Create a new evolver for this pset. For a discussion on evolvers in general see the
documentation for the pvector evolver.
Create the evolver and perform various mutating updates to it:
>>> s1 = s(1, 2, 3)
>>> e = s1.evolver()
>>> _ = e.add(4)
>>> len(e)
4
>>> _ = e.remove(1)
The underlying pset remains the same:
>>> s1
pset([1, 2, 3])
The changes are kept in the evolver. An updated pmap can be created using the
persistent() function on the evolver.
>>> s2 = e.persistent()
>>> s2
pset([2, 3, 4])
The new pset will share data with the original pset in the same way that would have
been done if only using operations on the pset.
"""
return PSet._Evolver(self)
# All the operations and comparisons you would expect on a set.
#
# This is not very beautiful. If we avoid inheriting from PSet we can use the
# __slots__ concepts (which requires a new style class) and hopefully save some memory.
__le__ = Set.__le__
__lt__ = Set.__lt__
__gt__ = Set.__gt__
__ge__ = Set.__ge__
__eq__ = Set.__eq__
__ne__ = Set.__ne__
__and__ = Set.__and__
__or__ = Set.__or__
__sub__ = Set.__sub__
__xor__ = Set.__xor__
issubset = __le__
issuperset = __ge__
union = __or__
intersection = __and__
difference = __sub__
symmetric_difference = __xor__
isdisjoint = Set.isdisjoint
Set.register(PSet)
Hashable.register(PSet)
_EMPTY_PSET = PSet(pmap())
def pset(iterable=(), pre_size=8):
"""
Creates a persistent set from iterable. Optionally takes a sizing parameter equivalent to that
used for :py:func:`pmap`.
>>> s1 = pset([1, 2, 3, 2])
>>> s1
pset([1, 2, 3])
"""
if not iterable:
return _EMPTY_PSET
return PSet._from_iterable(iterable, pre_size=pre_size)
def s(*elements):
"""
Create a persistent set.
Takes an arbitrary number of arguments to insert into the new set.
>>> s1 = s(1, 2, 3, 2)
>>> s1
pset([1, 2, 3])
"""
return pset(elements)