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R3600 invenio-infoscience
intbitset.pyx
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## This file is part of Invenio.
## Copyright (C) 2007, 2008, 2009, 2010, 2011 CERN.
##
## Invenio 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.
##
## Invenio 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 Invenio; if not, write to the Free Software Foundation, Inc.,
## 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
__revision__
=
"$Id$"
__apilevel__
=
1.06
"""
Defines an intbitset data object to hold unordered sets of unsigned
integers with ultra fast set operations, implemented via bit vectors
and Python C extension to optimize speed and memory usage.
Emulates the Python built-in set class interface with some additional
specific methods such as its own fast dump and load marshalling
functions. Uses real bits to optimize memory usage, so may have
issues with endianness if you transport serialized bitsets between
various machine architectures.
Please note that no bigger than __maxelem__ elements can be added to
an intbitset and, if CFG_INTBITSET_ENABLE_SANITY_CHECKS is disabled,
you will receive unpredictable results.
Note to Invenio developers: If you make modification to this file you
have to manually regenerate intbitset.c by running:
$ cython intbitset.pyx
and then commit generated intbitset.c to CVS.
"""
import
zlib
import
sys
from
array
import
array
from
invenio.config
import
CFG_INTBITSET_ENABLE_SANITY_CHECKS
from
invenio.intbitset_helper
import
_
__all__
=
[
'intbitset'
]
cdef
extern
from
*
:
## See: <http://wiki.cython.org/FAQ/#HowdoIuse.27const.27.3F>
## In order to avoid warnings with PyObject_AsReadBuffer
ctypedef
void
*
const_void_ptr
"const void*"
cdef
extern
from
"intbitset.h"
:
ctypedef
int
Py_ssize_t
cdef
extern
from
"Python.h"
:
object
PyString_FromStringAndSize
(
char
*
s
,
Py_ssize_t
len
)
int
PyObject_AsReadBuffer
(
object
obj
,
void
**
buf
,
Py_ssize_t
*
buf_len
)
cdef
extern
from
"intbitset.h"
:
ctypedef
unsigned
long
long
int
word_t
#ctypedef unsigned char bool_t
ctypedef
struct
IntBitSet
:
int
size
int
allocated
word_t
trailing_bits
int
tot
word_t
*
bitset
int
wordbytesize
int
wordbitsize
int
maxelem
IntBitSet
*
intBitSetCreate
(
int
size
,
bint
trailing_bits
)
IntBitSet
*
intBitSetCreateFromBuffer
(
void
*
buf
,
int
bufsize
)
IntBitSet
*
intBitSetResetFromBuffer
(
IntBitSet
*
bitset
,
void
*
buf
,
int
bufsize
)
IntBitSet
*
intBitSetReset
(
IntBitSet
*
bitset
)
void
intBitSetDestroy
(
IntBitSet
*
bitset
)
IntBitSet
*
intBitSetClone
(
IntBitSet
*
bitset
)
int
intBitSetGetSize
(
IntBitSet
*
bitset
)
int
intBitSetGetAllocated
(
IntBitSet
*
bitset
)
int
intBitSetGetTot
(
IntBitSet
*
bitset
)
bint
intBitSetIsInElem
(
IntBitSet
*
bitset
,
unsigned
int
elem
)
void
intBitSetAddElem
(
IntBitSet
*
bitset
,
unsigned
int
elem
)
void
intBitSetDelElem
(
IntBitSet
*
bitset
,
unsigned
int
elem
)
bint
intBitSetEmpty
(
IntBitSet
*
bitset
)
IntBitSet
*
intBitSetUnion
(
IntBitSet
*
x
,
IntBitSet
*
y
)
IntBitSet
*
intBitSetIntersection
(
IntBitSet
*
x
,
IntBitSet
*
y
)
IntBitSet
*
intBitSetSub
(
IntBitSet
*
x
,
IntBitSet
*
y
)
IntBitSet
*
intBitSetXor
(
IntBitSet
*
x
,
IntBitSet
*
y
)
IntBitSet
*
intBitSetIUnion
(
IntBitSet
*
dst
,
IntBitSet
*
src
)
IntBitSet
*
intBitSetIIntersection
(
IntBitSet
*
dst
,
IntBitSet
*
src
)
IntBitSet
*
intBitSetISub
(
IntBitSet
*
x
,
IntBitSet
*
y
)
IntBitSet
*
intBitSetIXor
(
IntBitSet
*
x
,
IntBitSet
*
y
)
int
intBitSetGetNext
(
IntBitSet
*
x
,
int
last
)
int
intBitSetGetLast
(
IntBitSet
*
x
)
unsigned
char
intBitSetCmp
(
IntBitSet
*
x
,
IntBitSet
*
y
)
__maxelem__
=
maxelem
cdef
class
intbitset
:
"""
Defines an intbitset data object to hold unordered sets of
unsigned integers with ultra fast set operations, implemented via
bit vectors and Python C extension to optimize speed and memory
usage.
Emulates the Python built-in set class interface with some
additional specific methods such as its own fast dump and load
marshalling functions. Uses real bits to optimize memory usage,
so may have issues with endianness if you transport serialized
bitsets between various machine architectures.
The constructor accept the following parameters:
rhs=0, int preallocate=-1, int trailing_bits=0,
bint sanity_checks=CFG_INTBITSET_ENABLE_SANITY_CHECKS,
int no_allocate=0:
where:
* rhs can be:
- int/long for creating allocating empty intbitset that will hold at least
rhs elements, before being resized
- intbitset for cloning
- str for retrieving an intbitset that was dumped into a string
- array for retrieving an intbitset that was dumped into a string stored
in an array
- sequence made of integers for copying all the elements from the
sequence. If minsize is specified than it is initially allocated
enough space to hold up to minsize integers, otherwise the biggest
element of the sequence will be used.
- sequence made of tuples: then the first element of each tuple
is considered as an integer (as in the sequence made of integers).
* preallocate is a suggested initial upper bound on the numbers that will be
stored, by looking at rhs a sequence of number.
* trailing_bits is 1, then the set will contain "all" the positive integers
* no_allocate is used internally and should never be set.
after the biggest one added with rhs.
"""
cdef
IntBitSet
*
bitset
cdef
bint
sanity_checks
def
__cinit__
(
self
,
rhs
=
0
,
int
preallocate
=-
1
,
int
trailing_bits
=
0
,
bint
sanity_checks
=
CFG_INTBITSET_ENABLE_SANITY_CHECKS
,
int
no_allocate
=
0
):
"""
Initialize intbitset.
* rhs can be:
- int/long for creating allocating empty intbitset that will hold at least
rhs elements, before being resized
- intbitset for cloning
- str for retrieving an intbitset that was dumped into a string
- array for retrieving an intbitset that was dumped into a string stored
in an array
- sequence made of integers for copying all the elements from the
sequence. If minsize is specified than it is initially allocated
enough space to hold up to minsize integers, otherwise the biggest
element of the sequence will be used.
* preallocate is a suggested initial upper bound on the numbers that will be
stored, by looking at rhs a sequence of number.
* trailing_bits is 1, then the set will contain "all" the positive integers
* no_allocate is used internally and should never be set.
after the biggest one added with rhs.
"""
cdef
Py_ssize_t
size
=
0
cdef
const_void_ptr
buf
=
NULL
cdef
int
elem
cdef
int
i
cdef
int
last
cdef
int
remelem
cdef
bint
tuple_of_tuples
self
.
sanity_checks
=
sanity_checks
#print >> sys.stderr, "intbitset.__cinit__ is called"
msg
=
"Error"
self
.
bitset
=
NULL
try
:
if
no_allocate
:
return
if
type
(
rhs
)
in
(
int
,
long
):
if
rhs
<
0
:
raise
ValueError
(
"rhs can't be negative"
)
self
.
bitset
=
intBitSetCreate
(
rhs
,
trailing_bits
)
elif
type
(
rhs
)
is
intbitset
:
self
.
bitset
=
intBitSetClone
((<
intbitset
>
rhs
)
.
bitset
)
elif
type
(
rhs
)
in
(
str
,
array
):
try
:
if
type
(
rhs
)
is
array
:
rhs
=
rhs
.
tostring
()
tmp
=
zlib
.
decompress
(
rhs
)
if
PyObject_AsReadBuffer
(
tmp
,
&
buf
,
&
size
)
<
0
:
raise
Exception
(
"Buffer error!!!"
)
if
(
size
%
wordbytesize
):
## Wrong size!
raise
Exception
()
self
.
bitset
=
intBitSetCreateFromBuffer
(
buf
,
size
)
except
Exception
,
msg
:
raise
ValueError
(
"rhs is corrupted:
%s
"
%
msg
)
elif
hasattr
(
rhs
,
'__iter__'
):
tuple_of_tuples
=
rhs
and
hasattr
(
rhs
[
0
],
'__getitem__'
)
try
:
if
preallocate
<
0
:
if
rhs
and
type
(
rhs
[
0
])
is
int
:
preallocate
=
max
(
rhs
)
else
:
preallocate
=
0
if
self
.
sanity_checks
:
if
not
(
0
<=
preallocate
<
maxelem
):
raise
OverflowError
(
"Can't store integers bigger than
%s
"
%
maxelem
)
self
.
bitset
=
intBitSetCreate
(
preallocate
,
trailing_bits
)
if
trailing_bits
:
last
=
0
if
self
.
sanity_checks
:
if
tuple_of_tuples
:
for
tmp_tuple
in
rhs
:
elem
=
tmp_tuple
[
0
]
if
elem
<
0
:
raise
ValueError
(
"Negative numbers, not allowed"
)
elif
elem
>
maxelem
:
raise
OverflowError
(
"Elements must be <=
%s
"
%
maxelem
)
for
remelem
from
last
<=
remelem
<
elem
:
intBitSetDelElem
(
self
.
bitset
,
remelem
)
last
=
elem
+
1
else
:
for
elem
in
rhs
:
if
elem
<
0
:
raise
ValueError
(
"Negative numbers, not allowed"
)
elif
elem
>
maxelem
:
raise
OverflowError
(
"Elements must be <=
%s
"
%
maxelem
)
for
remelem
from
last
<=
remelem
<
elem
:
intBitSetDelElem
(
self
.
bitset
,
remelem
)
last
=
elem
+
1
else
:
if
tuple_of_tuples
:
for
tmp_tuple
in
rhs
:
elem
=
tmp_tuple
[
0
]
for
remelem
from
last
<=
remelem
<
elem
:
intBitSetDelElem
(
self
.
bitset
,
remelem
)
last
=
elem
+
1
else
:
for
elem
in
rhs
:
for
remelem
from
last
<=
remelem
<
elem
:
intBitSetDelElem
(
self
.
bitset
,
remelem
)
last
=
elem
+
1
else
:
if
self
.
sanity_checks
:
if
tuple_of_tuples
:
for
tmp_tuple
in
rhs
:
elem
=
tmp_tuple
[
0
]
if
elem
<
0
:
raise
ValueError
(
"Negative numbers, not allowed"
)
elif
elem
>
maxelem
:
raise
OverflowError
(
"Elements must be <=
%s
"
%
maxelem
)
intBitSetAddElem
(
self
.
bitset
,
elem
)
else
:
for
elem
in
rhs
:
if
elem
<
0
:
raise
ValueError
(
"Negative numbers, not allowed"
)
elif
elem
>
maxelem
:
raise
OverflowError
(
"Elements must be <=
%s
"
%
maxelem
)
intBitSetAddElem
(
self
.
bitset
,
elem
)
else
:
if
tuple_of_tuples
:
for
tmp_tuple
in
rhs
:
elem
=
tmp_tuple
[
0
]
intBitSetAddElem
(
self
.
bitset
,
elem
)
else
:
for
elem
in
rhs
:
intBitSetAddElem
(
self
.
bitset
,
elem
)
except
Exception
,
msg
:
raise
ValueError
(
"retrieving integers from rhs is impossible:
%s
"
%
msg
)
else
:
raise
TypeError
(
"rhs is of unknown type
%s
"
%
type
(
rhs
))
except
:
intBitSetDestroy
(
self
.
bitset
)
raise
def
__dealloc__
(
self
):
#print >> sys.stderr, "intbitset.__dealloc__ is called"
intBitSetDestroy
(
self
.
bitset
)
def
__contains__
(
self
,
int
elem
):
if
self
.
sanity_checks
:
if
elem
<
0
:
raise
ValueError
(
"Negative numbers, not allowed"
)
elif
elem
>
maxelem
:
raise
OverflowError
(
"Element must be <=
%s
"
%
maxelem
)
return
intBitSetIsInElem
(
self
.
bitset
,
elem
)
!=
0
def
__cmp__
(
self
,
intbitset
rhs
not
None
):
raise
TypeError
(
"cannot compare intbitset using cmp()"
)
def
__richcmp__
(
self
,
intbitset
rhs
not
None
,
int
op
):
cdef
short
unsigned
int
tmp
tmp
=
intBitSetCmp
((<
intbitset
>
self
)
.
bitset
,
rhs
.
bitset
)
if
op
==
0
:
# <
return
tmp
==
1
if
op
==
1
:
# <=
return
tmp
<=
1
if
op
==
2
:
# ==
return
tmp
==
0
if
op
==
3
:
# !=
return
tmp
>
0
if
op
==
4
:
# >
return
tmp
==
2
if
op
==
5
:
# >=
return
tmp
in
(
0
,
2
)
def
__len__
(
self
):
return
intBitSetGetTot
(
self
.
bitset
)
def
__hash__
(
self
):
return
hash
(
PyString_FromStringAndSize
(
<
char
*>
self
.
bitset
.
bitset
,
wordbytesize
*
(
intBitSetGetTot
(
self
.
bitset
)
/
wordbitsize
+
1
)))
def
__nonzero__
(
self
):
return
not
intBitSetEmpty
(
self
.
bitset
)
def
__iadd__
(
self
,
rhs
):
cdef
int
elem
if
isinstance
(
rhs
,
(
int
,
long
)):
if
self
.
sanity_checks
:
if
rhs
<
0
:
raise
ValueError
(
"Negative numbers, not allowed"
)
elif
rhs
>
maxelem
:
raise
OverflowError
(
"rhs must be <=
%s
"
%
maxelem
)
intBitSetAddElem
(
self
.
bitset
,
rhs
)
elif
isinstance
(
rhs
,
intbitset
):
intBitSetIUnion
(
self
.
bitset
,
(<
intbitset
>
rhs
)
.
bitset
)
else
:
if
self
.
sanity_checks
:
for
elem
in
rhs
:
if
elem
<
0
:
raise
ValueError
(
"Negative numbers, not allowed"
)
elif
elem
>
maxelem
:
raise
OverflowError
(
"Elements must be <=
%s
"
%
maxelem
)
intBitSetAddElem
(
self
.
bitset
,
elem
)
else
:
for
elem
in
rhs
:
if
elem
<
0
:
raise
ValueError
(
"Negative numbers, not allowed"
)
elif
elem
>
maxelem
:
raise
OverflowError
(
"Elements must be <=
%s
"
%
maxelem
)
intBitSetAddElem
(
self
.
bitset
,
elem
)
return
self
def
__isub__
(
self
,
rhs
):
"""Remove all elements of another set from this set."""
cdef
int
elem
if
isinstance
(
rhs
,
(
int
,
long
)):
if
self
.
sanity_checks
:
if
rhs
<
0
:
raise
ValueError
(
"Negative numbers, not allowed"
)
elif
rhs
>
maxelem
:
raise
OverflowError
(
"rhs must be <=
%s
"
%
maxelem
)
intBitSetDelElem
(
self
.
bitset
,
rhs
)
elif
isinstance
(
rhs
,
intbitset
):
intBitSetISub
(
self
.
bitset
,
(<
intbitset
>
rhs
)
.
bitset
)
else
:
if
self
.
sanity_checks
:
for
elem
in
rhs
:
if
elem
<
0
:
raise
ValueError
(
"Negative numbers, not allowed"
)
elif
elem
>
maxelem
:
raise
OverflowError
(
"Elements must be <=
%s
"
%
maxelem
)
intBitSetDelElem
(
self
.
bitset
,
elem
)
else
:
for
elem
in
rhs
:
intBitSetDelElem
(
self
.
bitset
,
elem
)
return
self
def
__deepcopy__
(
self
,
memo
):
return
intbitset
(
self
)
def
__del__
(
self
,
int
elem
):
if
self
.
sanity_checks
:
if
elem
<
0
:
raise
ValueError
(
"Negative numbers, not allowed"
)
elif
elem
>
maxelem
:
raise
OverflowError
(
"Element must be <=
%s
"
%
maxelem
)
intBitSetDelElem
(
self
.
bitset
,
elem
)
def
__and__
(
self
,
intbitset
rhs
not
None
):
"""Return the intersection of two intbitsets as a new set.
(i.e. all elements that are in both intbitsets.)
"""
ret
=
intbitset
(
no_allocate
=
1
)
(<
intbitset
>
ret
)
.
bitset
=
intBitSetIntersection
((<
intbitset
>
self
)
.
bitset
,
rhs
.
bitset
)
return
ret
def
__or__
(
self
,
intbitset
rhs
not
None
):
"""Return the union of two intbitsets as a new set.
(i.e. all elements that are in either intbitsets.)
"""
ret
=
intbitset
(
no_allocate
=
1
)
(<
intbitset
>
ret
)
.
bitset
=
intBitSetUnion
((<
intbitset
>
self
)
.
bitset
,
rhs
.
bitset
)
return
ret
def
__xor__
(
self
,
intbitset
rhs
not
None
):
"""Return the symmetric difference of two sets as a new set.
(i.e. all elements that are in exactly one of the sets.)
"""
ret
=
intbitset
(
no_allocate
=
1
)
(<
intbitset
>
ret
)
.
bitset
=
intBitSetXor
((<
intbitset
>
self
)
.
bitset
,
rhs
.
bitset
)
return
ret
def
__sub__
(
self
,
intbitset
rhs
not
None
):
"""Return the difference of two intbitsets as a new set.
(i.e. all elements that are in this intbitset but not the other.)
"""
ret
=
intbitset
(
no_allocate
=
1
)
(<
intbitset
>
ret
)
.
bitset
=
intBitSetSub
((<
intbitset
>
self
)
.
bitset
,
rhs
.
bitset
)
return
ret
def
__iand__
(
self
,
intbitset
rhs
not
None
):
"""Update a intbitset with the intersection of itself and another."""
intBitSetIIntersection
(
self
.
bitset
,
rhs
.
bitset
)
return
self
def
__ior__
(
self
,
intbitset
rhs
not
None
):
"""Update a intbitset with the union of itself and another."""
intBitSetIUnion
(
self
.
bitset
,
rhs
.
bitset
)
return
self
def
__ixor__
(
self
,
intbitset
rhs
not
None
):
"""Update an intbitset with the symmetric difference of itself and another.
"""
intBitSetIXor
(
self
.
bitset
,
rhs
.
bitset
)
return
self
def
__repr__
(
self
):
cdef
int
last
cdef
int
maxelem
cdef
int
next_last
finite_list
=
self
.
extract_finite_list
()
if
self
.
bitset
.
trailing_bits
:
return
"intbitset(
%s
, trailing_bits=True)"
%
repr
(
finite_list
)
else
:
return
"intbitset(
%s
)"
%
repr
(
finite_list
)
def
__str__
(
self
):
cdef
int
tot
tot
=
intBitSetGetTot
(
self
.
bitset
)
if
tot
<
0
:
begin_list
=
self
[
0
:
10
]
ret
=
"intbitset(["
for
n
in
begin_list
:
ret
=
ret
+
'
%i
, '
%
n
ret
=
ret
+
"...])"
return
ret
elif
tot
>
10
:
begin_list
=
self
[
0
:
5
]
end_list
=
self
[
tot
-
5
:
tot
]
ret
=
"intbitset(["
for
n
in
begin_list
:
ret
=
ret
+
'
%i
, '
%
n
ret
=
ret
+
"..., "
for
n
in
end_list
:
ret
=
ret
+
'
%i
, '
%
n
ret
=
ret
[:
-
2
]
ret
=
ret
+
'])'
return
ret
else
:
return
self
.
__repr__
()
def
__getitem__
(
self
,
key
):
cdef
Py_ssize_t
i
cdef
int
elem
=
-
1
cdef
int
start
cdef
int
end
cdef
int
step
if
hasattr
(
key
,
'indices'
):
## This is a slice object!
if
self
.
bitset
.
trailing_bits
and
(
key
.
start
<
0
or
key
.
stop
<
0
):
raise
IndexError
(
"negative indexes are not allowed on infinite intbitset"
)
retset
=
intbitset
()
start
,
end
,
step
=
key
.
indices
(
intBitSetGetTot
(
self
.
bitset
))
if
step
<
0
:
raise
ValueError
(
"negative steps are not yet supported"
)
for
i
in
range
(
start
):
elem
=
intBitSetGetNext
(
self
.
bitset
,
elem
)
if
elem
<
0
:
return
retset
for
i
in
range
(
end
-
start
):
elem
=
intBitSetGetNext
(
self
.
bitset
,
elem
)
if
elem
<
0
:
return
retset
if
i
%
step
==
0
:
retset
.
add
(
elem
)
return
retset
else
:
end
=
key
if
end
<
0
:
if
self
.
bitset
.
trailing_bits
:
raise
IndexError
(
"negative indexes are not allowed on infinite intbitset"
)
end
+=
intBitSetGetTot
(
self
.
bitset
)
if
end
<
0
:
raise
IndexError
(
"intbitset index out of range"
)
if
end
>=
intBitSetGetTot
(
self
.
bitset
):
raise
IndexError
(
"intbitset index out of range"
)
for
i
in
range
(
end
+
1
):
elem
=
intBitSetGetNext
(
self
.
bitset
,
elem
)
return
elem
#def __getslice__(self, Py_ssize_t key1, Py_ssize_t key2):
#cdef Py_ssize_t i
#cdef int elem = -1
#ret = intbitset()
#if key1 < 0:
#if self.bitset.trailing_bits:
#raise IndexError("negative indexes are not allowed on infinite intbitset")
#key1 += intBitSetGetTot(self.bitset)
#if key1 < 0:
#key1 = 0
#if key2 < 0:
#if self.bitset.trailing_bits:
#raise IndexError("negative indexes are not allowed on infinite intbitset")
#key2 += intBitSetGetTot(self.bitset)
#for i in range(key1):
#elem = intBitSetGetNext(self.bitset, elem)
#if elem < -1:
#return ret
#for i in range(key2 + 1):
#elem = intBitSetGetNext(self.bitset, elem)
#if elem < -1:
#return ret
#ret.add(elem)
#return ret
## Buffer interface
#def __getreadbuffer__(self, int i, void **p):
#if i != 0:
#return -1
#p[0] = (<intbitset >self).bitset
#return (<intbitset >self).size * wordbytesize
#def __getwritebuffer__(self, int i, void **p):
#if i != 0:
#raise SystemError
#p[0] = (<intbitset >self).bitset
#return (<intbitset >self).size * wordbytesize
#def __getsegcount__(self, int *p):
#if p != NULL:
#p[0] = (<intbitset >self).size * wordbytesize
#return 1
#def __getcharbuffer__(self, int i, char **p):
#if i != 0:
#return -1
#p[0] = <char *> (<intbitset >self).bitset
#return (<intbitset >self).size * wordbytesize
# pickle interface
def
__reduce__
(
self
):
return
_
,
(
self
.
fastdump
(),)
__safe_for_unpickling__
=
True
# Iterator interface
def
__iter__
(
self
):
if
self
.
bitset
.
trailing_bits
:
raise
OverflowError
(
"It's impossible to iterate over an infinite set."
)
return
intbitset_iterator
(
self
)
# Customized interface
def
add
(
self
,
int
elem
):
"""Add an element to a set.
This has no effect if the element is already present."""
if
self
.
sanity_checks
:
if
elem
<
0
:
raise
ValueError
(
"Negative numbers, not allowed"
)
elif
elem
>
maxelem
:
raise
OverflowError
(
"Element must be <=
%s
"
%
maxelem
)
intBitSetAddElem
(
self
.
bitset
,
elem
)
def
clear
(
self
):
intBitSetReset
(
self
.
bitset
)
def
discard
(
self
,
int
elem
):
"""Remove an element from a intbitset if it is a member.
If the element is not a member, do nothing."""
if
self
.
sanity_checks
:
if
elem
<
0
:
raise
ValueError
(
"Negative numbers, not allowed"
)
elif
elem
>
maxelem
:
raise
OverflowError
(
"Element must be <=
%s
"
%
maxelem
)
intBitSetDelElem
(
self
.
bitset
,
elem
)
difference
=
__sub__
difference_update
=
__isub__
intersection
=
__and__
intersection_update
=
__iand__
union
=
__or__
union_update
=
__ior__
symmetric_difference
=
__xor__
symmetric_difference_update
=
__ixor__
def
issubset
(
self
,
rhs
):
"""Report whether another set contains this set."""
return
self
.
__le__
(
rhs
)
def
issuperset
(
self
,
rhs
):
"""Report whether this set contains another set."""
return
self
.
__ge__
(
rhs
)
# Dumping & Loading
def
fastdump
(
self
):
"""Return a compressed string representation suitable to be saved
somewhere."""
cdef
Py_ssize_t
size
size
=
intBitSetGetSize
((<
intbitset
>
self
)
.
bitset
)
tmp
=
PyString_FromStringAndSize
(
<
char
*>
self
.
bitset
.
bitset
,
(
size
+
1
)
*
wordbytesize
)
return
zlib
.
compress
(
tmp
)
def
fastload
(
self
,
strdump
):
"""Load a compressed string representation produced by a previous call
to the fastdump method into the current intbitset. The previous content
will be replaced."""
cdef
Py_ssize_t
size
cdef
const_void_ptr
buf
buf
=
NULL
size
=
0
try
:
if
type
(
strdump
)
is
array
:
strdump
=
strdump
.
tostring
()
# tmp needed to not be garbage collected
tmp
=
zlib
.
decompress
(
strdump
)
if
PyObject_AsReadBuffer
(
tmp
,
&
buf
,
&
size
)
<
0
:
raise
Exception
()
if
(
size
%
wordbytesize
):
## Wrong size!
raise
Exception
()
intBitSetResetFromBuffer
((<
intbitset
>
self
)
.
bitset
,
buf
,
size
)
except
:
raise
ValueError
(
"strdump is corrupted"
)
return
self
def
copy
(
self
):
"""Return a shallow copy of a set."""
return
intbitset
(
self
)
def
pop
(
self
):
"""Remove and return an arbitrary set element.
@note: intbitset implementation of .pop() differs from the native C{set}
implementation by guaranteeing returning always the largest element.
"""
cdef
int
ret
ret
=
intBitSetGetLast
(
self
.
bitset
)
if
ret
<
0
:
raise
KeyError
(
"pop from an empty or infinite intbitset"
)
intBitSetDelElem
(
self
.
bitset
,
ret
)
return
ret
def
remove
(
self
,
int
elem
):
"""Remove an element from a set; it must be a member.
If the element is not a member, raise a KeyError.
"""
if
self
.
sanity_checks
:
if
elem
<
0
:
raise
ValueError
(
"Negative numbers, not allowed"
)
elif
elem
>
maxelem
:
raise
OverflowError
(
"Elements must be <=
%s
"
%
maxelem
)
if
intBitSetIsInElem
(
self
.
bitset
,
elem
):
intBitSetDelElem
(
self
.
bitset
,
elem
)
else
:
raise
KeyError
(
elem
)
def
strbits
(
self
):
"""Return a string of 0s and 1s representing the content in memory
of the intbitset.
"""
cdef
int
i
cdef
int
last
if
(<
intbitset
>
self
)
.
bitset
.
trailing_bits
:
raise
OverflowError
(
"It's impossible to print an infinite set."
)
last
=
0
ret
=
[]
for
i
in
self
:
ret
.
append
(
'0'
*
(
i
-
last
)
+
'1'
)
last
=
i
+
1
return
''
.
join
(
ret
)
def
update_with_signs
(
self
,
rhs
):
"""Given a dictionary rhs whose keys are integers, remove all the integers
whose value are less than 0 and add every integer whose value is 0 or more"""
cdef
int
value
try
:
if
self
.
sanity_checks
:
for
value
,
sign
in
rhs
.
iteritems
():
if
value
<
0
:
raise
ValueError
(
"Negative numbers, not allowed"
)
elif
value
>
maxelem
:
raise
OverflowError
(
"Elements must <=
%s
"
%
maxelem
)
if
sign
<
0
:
intBitSetDelElem
(
self
.
bitset
,
value
)
else
:
intBitSetAddElem
(
self
.
bitset
,
value
)
else
:
for
value
,
sign
in
rhs
.
iteritems
():
if
sign
<
0
:
intBitSetDelElem
(
self
.
bitset
,
value
)
else
:
intBitSetAddElem
(
self
.
bitset
,
value
)
except
AttributeError
:
raise
TypeError
(
"rhs should be a valid dictionary with integers keys and integer values"
)
def
get_size
(
self
):
return
intBitSetGetSize
(
self
.
bitset
)
def
get_allocated
(
self
):
return
intBitSetGetAllocated
(
self
.
bitset
)
def
is_infinite
(
self
):
"""Return True if the intbitset is infinite. (i.e. trailing_bits=True
was used in the constructor.)"""
return
self
.
bitset
.
trailing_bits
!=
0
def
extract_finite_list
(
self
,
int
up_to
=-
1
):
"""Return a finite list of elements sufficient to be passed to intbitset
constructor toghether with the proper value of trailing_bits in order
to reproduce this intbitset. At least up_to integer are looked for when
they are inside the intbitset but not necessarily needed to build the
intbitset"""
cdef
int
true_up_to
cdef
int
last
if
self
.
sanity_checks
and
up_to
>
maxelem
:
raise
OverflowError
(
"up_to must be <=
%s
"
%
maxelem
)
ret
=
[]
true_up_to
=
max
(
up_to
,
(
intBitSetGetSize
(
self
.
bitset
))
*
wordbitsize
)
last
=
-
1
while
last
<
true_up_to
:
last
=
intBitSetGetNext
(
self
.
bitset
,
last
)
if
last
==
-
2
:
break
ret
.
append
(
last
)
return
ret
def
get_wordbitsize
(
self
):
return
wordbitsize
def
get_wordbytsize
(
self
):
return
wordbytesize
def
tolist
(
self
):
"""Legacy method to retrieve a list of all the elements inside an
intbitset.
"""
if
self
.
bitset
.
trailing_bits
:
raise
OverflowError
(
"It's impossible to retrieve a list of an infinite set"
)
return
self
.
extract_finite_list
()
cdef
object
__weakref__
cdef
class
intbitset_iterator
:
cdef
int
last
cdef
IntBitSet
*
bitset
cdef
bint
sanity_checks
def
__cinit__
(
self
,
intbitset
bitset
not
None
):
#print >> sys.stderr, "intbitset_iterator.__cinit__ is called"
self
.
last
=
-
1
## A copy should be performed, in case the original bitset disappears
## as in "for x in intbitset([1,2,3])"!
self
.
bitset
=
intBitSetClone
(
bitset
.
bitset
)
self
.
sanity_checks
=
CFG_INTBITSET_ENABLE_SANITY_CHECKS
def
__dealloc__
(
self
):
#print >> sys.stderr, "intbitset_iterator.__dealloc__ is called"
intBitSetDestroy
(
self
.
bitset
)
def
__next__
(
self
):
if
self
.
last
==
-
2
:
raise
StopIteration
()
self
.
last
=
intBitSetGetNext
(
self
.
bitset
,
self
.
last
)
if
self
.
sanity_checks
and
(
self
.
bitset
.
allocated
<
self
.
bitset
.
size
):
raise
MemoryError
(
"intbitset corrupted: allocated:
%s
, size:
%s
"
%
(
self
.
bitset
.
allocated
,
self
.
bitset
.
size
))
if
self
.
last
<
0
:
self
.
last
=
-
2
raise
StopIteration
()
return
self
.
last
def
__iter__
(
self
):
return
self
cdef
object
__weakref__
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