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cpython/Objects/setobject.c

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/* set object implementation
Written and maintained by Raymond D. Hettinger <python@rcn.com>
Derived from Lib/sets.py and Objects/dictobject.c.
Copyright (c) 2003-6 Python Software Foundation.
All rights reserved.
*/
#include "Python.h"
#include "structmember.h"
/* This must be >= 1. */
#define PERTURB_SHIFT 5
/* Object used as dummy key to fill deleted entries */
static PyObject *dummy = NULL; /* Initialized by first call to make_new_set() */
#ifdef Py_REF_DEBUG
PyObject *
_PySet_Dummy(void)
{
return dummy;
}
#endif
#define INIT_NONZERO_SET_SLOTS(so) do { \
(so)->table = (so)->smalltable; \
(so)->mask = PySet_MINSIZE - 1; \
(so)->hash = -1; \
} while(0)
#define EMPTY_TO_MINSIZE(so) do { \
memset((so)->smalltable, 0, sizeof((so)->smalltable)); \
(so)->used = (so)->fill = 0; \
INIT_NONZERO_SET_SLOTS(so); \
} while(0)
/* Reuse scheme to save calls to malloc, free, and memset */
#define MAXFREESETS 80
static PySetObject *free_sets[MAXFREESETS];
static int num_free_sets = 0;
/*
The basic lookup function used by all operations.
This is based on Algorithm D from Knuth Vol. 3, Sec. 6.4.
Open addressing is preferred over chaining since the link overhead for
chaining would be substantial (100% with typical malloc overhead).
The initial probe index is computed as hash mod the table size. Subsequent
probe indices are computed as explained in Objects/dictobject.c.
All arithmetic on hash should ignore overflow.
Unlike the dictionary implementation, the lookkey functions can return
NULL if the rich comparison returns an error.
*/
static setentry *
set_lookkey(PySetObject *so, PyObject *key, register long hash)
{
register Py_ssize_t i;
register size_t perturb;
register setentry *freeslot;
register size_t mask = so->mask;
setentry *table = so->table;
register setentry *entry;
register int cmp;
PyObject *startkey;
i = hash & mask;
entry = &table[i];
if (entry->key == NULL || entry->key == key)
return entry;
if (entry->key == dummy)
freeslot = entry;
else {
if (entry->hash == hash) {
startkey = entry->key;
cmp = PyObject_RichCompareBool(startkey, key, Py_EQ);
if (cmp < 0)
return NULL;
if (table == so->table && entry->key == startkey) {
if (cmp > 0)
return entry;
}
else {
/* The compare did major nasty stuff to the
* set: start over.
*/
return set_lookkey(so, key, hash);
}
}
freeslot = NULL;
}
/* In the loop, key == dummy is by far (factor of 100s) the
least likely outcome, so test for that last. */
for (perturb = hash; ; perturb >>= PERTURB_SHIFT) {
i = (i << 2) + i + perturb + 1;
entry = &table[i & mask];
if (entry->key == NULL) {
if (freeslot != NULL)
entry = freeslot;
break;
}
if (entry->key == key)
break;
if (entry->hash == hash && entry->key != dummy) {
startkey = entry->key;
cmp = PyObject_RichCompareBool(startkey, key, Py_EQ);
if (cmp < 0)
return NULL;
if (table == so->table && entry->key == startkey) {
if (cmp > 0)
break;
}
else {
/* The compare did major nasty stuff to the
* set: start over.
*/
return set_lookkey(so, key, hash);
}
}
else if (entry->key == dummy && freeslot == NULL)
freeslot = entry;
}
return entry;
}
/*
* Hacked up version of set_lookkey which can assume keys are always strings;
* This means we can always use _PyString_Eq directly and not have to check to
* see if the comparison altered the table.
*/
static setentry *
set_lookkey_string(PySetObject *so, PyObject *key, register long hash)
{
register Py_ssize_t i;
register size_t perturb;
register setentry *freeslot;
register size_t mask = so->mask;
setentry *table = so->table;
register setentry *entry;
/* Make sure this function doesn't have to handle non-string keys,
including subclasses of str; e.g., one reason to subclass
strings is to override __eq__, and for speed we don't cater to
that here. */
if (!PyString_CheckExact(key)) {
so->lookup = set_lookkey;
return set_lookkey(so, key, hash);
}
i = hash & mask;
entry = &table[i];
if (entry->key == NULL || entry->key == key)
return entry;
if (entry->key == dummy)
freeslot = entry;
else {
if (entry->hash == hash && _PyString_Eq(entry->key, key))
return entry;
freeslot = NULL;
}
/* In the loop, key == dummy is by far (factor of 100s) the
least likely outcome, so test for that last. */
for (perturb = hash; ; perturb >>= PERTURB_SHIFT) {
i = (i << 2) + i + perturb + 1;
entry = &table[i & mask];
if (entry->key == NULL)
return freeslot == NULL ? entry : freeslot;
if (entry->key == key
|| (entry->hash == hash
&& entry->key != dummy
&& _PyString_Eq(entry->key, key)))
return entry;
if (entry->key == dummy && freeslot == NULL)
freeslot = entry;
}
}
/*
Internal routine to insert a new key into the table.
Used both by the internal resize routine and by the public insert routine.
Eats a reference to key.
*/
static int
set_insert_key(register PySetObject *so, PyObject *key, long hash)
{
register setentry *entry;
typedef setentry *(*lookupfunc)(PySetObject *, PyObject *, long);
assert(so->lookup != NULL);
entry = so->lookup(so, key, hash);
if (entry == NULL)
return -1;
if (entry->key == NULL) {
/* UNUSED */
so->fill++;
entry->key = key;
entry->hash = hash;
so->used++;
} else if (entry->key == dummy) {
/* DUMMY */
entry->key = key;
entry->hash = hash;
so->used++;
Py_DECREF(dummy);
} else {
/* ACTIVE */
Py_DECREF(key);
}
return 0;
}
/*
Restructure the table by allocating a new table and reinserting all
keys again. When entries have been deleted, the new table may
actually be smaller than the old one.
*/
static int
set_table_resize(PySetObject *so, Py_ssize_t minused)
{
Py_ssize_t newsize;
setentry *oldtable, *newtable, *entry;
Py_ssize_t i;
int is_oldtable_malloced;
setentry small_copy[PySet_MINSIZE];
assert(minused >= 0);
/* Find the smallest table size > minused. */
for (newsize = PySet_MINSIZE;
newsize <= minused && newsize > 0;
newsize <<= 1)
;
if (newsize <= 0) {
PyErr_NoMemory();
return -1;
}
/* Get space for a new table. */
oldtable = so->table;
assert(oldtable != NULL);
is_oldtable_malloced = oldtable != so->smalltable;
if (newsize == PySet_MINSIZE) {
/* A large table is shrinking, or we can't get any smaller. */
newtable = so->smalltable;
if (newtable == oldtable) {
if (so->fill == so->used) {
/* No dummies, so no point doing anything. */
return 0;
}
/* We're not going to resize it, but rebuild the
table anyway to purge old dummy entries.
Subtle: This is *necessary* if fill==size,
as set_lookkey needs at least one virgin slot to
terminate failing searches. If fill < size, it's
merely desirable, as dummies slow searches. */
assert(so->fill > so->used);
memcpy(small_copy, oldtable, sizeof(small_copy));
oldtable = small_copy;
}
}
else {
newtable = PyMem_NEW(setentry, newsize);
if (newtable == NULL) {
PyErr_NoMemory();
return -1;
}
}
/* Make the set empty, using the new table. */
assert(newtable != oldtable);
so->table = newtable;
so->mask = newsize - 1;
memset(newtable, 0, sizeof(setentry) * newsize);
so->used = 0;
i = so->fill;
so->fill = 0;
/* Copy the data over; this is refcount-neutral for active entries;
dummy entries aren't copied over, of course */
for (entry = oldtable; i > 0; entry++) {
if (entry->key == NULL) {
/* UNUSED */
;
} else if (entry->key == dummy) {
/* DUMMY */
--i;
assert(entry->key == dummy);
Py_DECREF(entry->key);
} else {
/* ACTIVE */
--i;
if(set_insert_key(so, entry->key, entry->hash) == -1) {
if (is_oldtable_malloced)
PyMem_DEL(oldtable);
return -1;
}
}
}
if (is_oldtable_malloced)
PyMem_DEL(oldtable);
return 0;
}
/* CAUTION: set_add_key/entry() must guarantee it won't resize the table */
static int
set_add_entry(register PySetObject *so, setentry *entry)
{
register Py_ssize_t n_used;
assert(so->fill <= so->mask); /* at least one empty slot */
n_used = so->used;
Py_INCREF(entry->key);
if (set_insert_key(so, entry->key, entry->hash) == -1)
return -1;
if (!(so->used > n_used && so->fill*3 >= (so->mask+1)*2))
return 0;
return set_table_resize(so, so->used>50000 ? so->used*2 : so->used*4);
}
static int
set_add_key(register PySetObject *so, PyObject *key)
{
register long hash;
register Py_ssize_t n_used;
if (!PyString_CheckExact(key) ||
(hash = ((PyStringObject *) key)->ob_shash) == -1) {
hash = PyObject_Hash(key);
if (hash == -1)
return -1;
}
assert(so->fill <= so->mask); /* at least one empty slot */
n_used = so->used;
Py_INCREF(key);
if (set_insert_key(so, key, hash) == -1) {
Py_DECREF(key);
return -1;
}
if (!(so->used > n_used && so->fill*3 >= (so->mask+1)*2))
return 0;
return set_table_resize(so, so->used>50000 ? so->used*2 : so->used*4);
}
#define DISCARD_NOTFOUND 0
#define DISCARD_FOUND 1
static int
set_discard_entry(PySetObject *so, setentry *oldentry)
{ register setentry *entry;
PyObject *old_key;
entry = (so->lookup)(so, oldentry->key, oldentry->hash);
if (entry == NULL)
return -1;
if (entry->key == NULL || entry->key == dummy)
return DISCARD_NOTFOUND;
old_key = entry->key;
Py_INCREF(dummy);
entry->key = dummy;
so->used--;
Py_DECREF(old_key);
return DISCARD_FOUND;
}
static int
set_discard_key(PySetObject *so, PyObject *key)
{
register long hash;
register setentry *entry;
PyObject *old_key;
assert (PyAnySet_Check(so));
if (!PyString_CheckExact(key) ||
(hash = ((PyStringObject *) key)->ob_shash) == -1) {
hash = PyObject_Hash(key);
if (hash == -1)
return -1;
}
entry = (so->lookup)(so, key, hash);
if (entry == NULL)
return -1;
if (entry->key == NULL || entry->key == dummy)
return DISCARD_NOTFOUND;
old_key = entry->key;
Py_INCREF(dummy);
entry->key = dummy;
so->used--;
Py_DECREF(old_key);
return DISCARD_FOUND;
}
static int
set_clear_internal(PySetObject *so)
{
setentry *entry, *table;
int table_is_malloced;
Py_ssize_t fill;
setentry small_copy[PySet_MINSIZE];
#ifdef Py_DEBUG
Py_ssize_t i, n;
assert (PyAnySet_Check(so));
n = so->mask + 1;
i = 0;
#endif
table = so->table;
assert(table != NULL);
table_is_malloced = table != so->smalltable;
/* This is delicate. During the process of clearing the set,
* decrefs can cause the set to mutate. To avoid fatal confusion
* (voice of experience), we have to make the set empty before
* clearing the slots, and never refer to anything via so->ref while
* clearing.
*/
fill = so->fill;
if (table_is_malloced)
EMPTY_TO_MINSIZE(so);
else if (fill > 0) {
/* It's a small table with something that needs to be cleared.
* Afraid the only safe way is to copy the set entries into
* another small table first.
*/
memcpy(small_copy, table, sizeof(small_copy));
table = small_copy;
EMPTY_TO_MINSIZE(so);
}
/* else it's a small table that's already empty */
/* Now we can finally clear things. If C had refcounts, we could
* assert that the refcount on table is 1 now, i.e. that this function
* has unique access to it, so decref side-effects can't alter it.
*/
for (entry = table; fill > 0; ++entry) {
#ifdef Py_DEBUG
assert(i < n);
++i;
#endif
if (entry->key) {
--fill;
Py_DECREF(entry->key);
}
#ifdef Py_DEBUG
else
assert(entry->key == NULL);
#endif
}
if (table_is_malloced)
PyMem_DEL(table);
return 0;
}
/*
* Iterate over a set table. Use like so:
*
* Py_ssize_t pos;
* setentry *entry;
* pos = 0; # important! pos should not otherwise be changed by you
* while (set_next(yourset, &pos, &entry)) {
* Refer to borrowed reference in entry->key.
* }
*
* CAUTION: In general, it isn't safe to use set_next in a loop that
* mutates the table.
*/
static int
set_next(PySetObject *so, Py_ssize_t *pos_ptr, setentry **entry_ptr)
{
Py_ssize_t i;
Py_ssize_t mask;
register setentry *table;
assert (PyAnySet_Check(so));
i = *pos_ptr;
assert(i >= 0);
table = so->table;
mask = so->mask;
while (i <= mask && (table[i].key == NULL || table[i].key == dummy))
i++;
*pos_ptr = i+1;
if (i > mask)
return 0;
assert(table[i].key != NULL);
*entry_ptr = &table[i];
return 1;
}
static void
set_dealloc(PySetObject *so)
{
register setentry *entry;
Py_ssize_t fill = so->fill;
PyObject_GC_UnTrack(so);
Py_TRASHCAN_SAFE_BEGIN(so)
if (so->weakreflist != NULL)
PyObject_ClearWeakRefs((PyObject *) so);
for (entry = so->table; fill > 0; entry++) {
if (entry->key) {
--fill;
Py_DECREF(entry->key);
}
}
if (so->table != so->smalltable)
PyMem_DEL(so->table);
if (num_free_sets < MAXFREESETS && PyAnySet_CheckExact(so))
free_sets[num_free_sets++] = so;
else
so->ob_type->tp_free(so);
Py_TRASHCAN_SAFE_END(so)
}
static int
set_tp_print(PySetObject *so, FILE *fp, int flags)
{
setentry *entry;
Py_ssize_t pos=0;
char *emit = ""; /* No separator emitted on first pass */
char *separator = ", ";
fprintf(fp, "%s([", so->ob_type->tp_name);
while (set_next(so, &pos, &entry)) {
fputs(emit, fp);
emit = separator;
if (PyObject_Print(entry->key, fp, 0) != 0)
return -1;
}
fputs("])", fp);
return 0;
}
static PyObject *
set_repr(PySetObject *so)
{
PyObject *keys, *result, *listrepr;
keys = PySequence_List((PyObject *)so);
if (keys == NULL)
return NULL;
listrepr = PyObject_Repr(keys);
Py_DECREF(keys);
if (listrepr == NULL)
return NULL;
result = PyString_FromFormat("%s(%s)", so->ob_type->tp_name,
PyString_AS_STRING(listrepr));
Py_DECREF(listrepr);
return result;
}
static Py_ssize_t
set_len(PyObject *so)
{
return ((PySetObject *)so)->used;
}
static int
set_merge(PySetObject *so, PyObject *otherset)
{
PySetObject *other;
register Py_ssize_t i;
register setentry *entry;
assert (PyAnySet_Check(so));
assert (PyAnySet_Check(otherset));
other = (PySetObject*)otherset;
if (other == so || other->used == 0)
/* a.update(a) or a.update({}); nothing to do */
return 0;
/* Do one big resize at the start, rather than
* incrementally resizing as we insert new keys. Expect
* that there will be no (or few) overlapping keys.
*/
if ((so->fill + other->used)*3 >= (so->mask+1)*2) {
if (set_table_resize(so, (so->used + other->used)*2) != 0)
return -1;
}
for (i = 0; i <= other->mask; i++) {
entry = &other->table[i];
if (entry->key != NULL &&
entry->key != dummy) {
Py_INCREF(entry->key);
if (set_insert_key(so, entry->key, entry->hash) == -1) {
Py_DECREF(entry->key);
return -1;
}
}
}
return 0;
}
static int
set_contains_key(PySetObject *so, PyObject *key)
{
long hash;
setentry *entry;
if (!PyString_CheckExact(key) ||
(hash = ((PyStringObject *) key)->ob_shash) == -1) {
hash = PyObject_Hash(key);
if (hash == -1)
return -1;
}
entry = (so->lookup)(so, key, hash);
if (entry == NULL)
return -1;
key = entry->key;
return key != NULL && key != dummy;
}
static int
set_contains_entry(PySetObject *so, setentry *entry)
{
PyObject *key;
setentry *lu_entry;
lu_entry = (so->lookup)(so, entry->key, entry->hash);
if (lu_entry == NULL)
return -1;
key = lu_entry->key;
return key != NULL && key != dummy;
}
static PyObject *
set_pop(PySetObject *so)
{
register Py_ssize_t i = 0;
register setentry *entry;
PyObject *key;
assert (PyAnySet_Check(so));
if (so->used == 0) {
PyErr_SetString(PyExc_KeyError, "pop from an empty set");
return NULL;
}
/* Set entry to "the first" unused or dummy set entry. We abuse
* the hash field of slot 0 to hold a search finger:
* If slot 0 has a value, use slot 0.
* Else slot 0 is being used to hold a search finger,
* and we use its hash value as the first index to look.
*/
entry = &so->table[0];
if (entry->key == NULL || entry->key == dummy) {
i = entry->hash;
/* The hash field may be a real hash value, or it may be a
* legit search finger, or it may be a once-legit search
* finger that's out of bounds now because it wrapped around
* or the table shrunk -- simply make sure it's in bounds now.
*/
if (i > so->mask || i < 1)
i = 1; /* skip slot 0 */
while ((entry = &so->table[i])->key == NULL || entry->key==dummy) {
i++;
if (i > so->mask)
i = 1;
}
}
key = entry->key;
Py_INCREF(dummy);
entry->key = dummy;
so->used--;
so->table[0].hash = i + 1; /* next place to start */
return key;
}
PyDoc_STRVAR(pop_doc, "Remove and return an arbitrary set element.");
static int
set_traverse(PySetObject *so, visitproc visit, void *arg)
{
Py_ssize_t pos = 0;
setentry *entry;
while (set_next(so, &pos, &entry))
Py_VISIT(entry->key);
return 0;
}
static long
frozenset_hash(PyObject *self)
{
PySetObject *so = (PySetObject *)self;
long h, hash = 1927868237L;
setentry *entry;
Py_ssize_t pos = 0;
if (so->hash != -1)
return so->hash;
hash *= PySet_GET_SIZE(self) + 1;
while (set_next(so, &pos, &entry)) {
/* Work to increase the bit dispersion for closely spaced hash
values. The is important because some use cases have many
combinations of a small number of elements with nearby
hashes so that many distinct combinations collapse to only
a handful of distinct hash values. */
h = entry->hash;
hash ^= (h ^ (h << 16) ^ 89869747L) * 3644798167u;
}
hash = hash * 69069L + 907133923L;
if (hash == -1)
hash = 590923713L;
so->hash = hash;
return hash;
}
static long
set_nohash(PyObject *self)
{
PyErr_SetString(PyExc_TypeError, "set objects are unhashable");
return -1;
}
/***** Set iterator type ***********************************************/
typedef struct {
PyObject_HEAD
PySetObject *si_set; /* Set to NULL when iterator is exhausted */
Py_ssize_t si_used;
Py_ssize_t si_pos;
Py_ssize_t len;
} setiterobject;
static void
setiter_dealloc(setiterobject *si)
{
Py_XDECREF(si->si_set);
PyObject_Del(si);
}
static PyObject *
setiter_len(setiterobject *si)
{
Py_ssize_t len = 0;
if (si->si_set != NULL && si->si_used == si->si_set->used)
len = si->len;
return PyInt_FromLong(len);
}
PyDoc_STRVAR(length_hint_doc, "Private method returning an estimate of len(list(it)).");
static PyMethodDef setiter_methods[] = {
{"__length_hint__", (PyCFunction)setiter_len, METH_NOARGS, length_hint_doc},
{NULL, NULL} /* sentinel */
};
static PyObject *setiter_iternext(setiterobject *si)
{
PyObject *key;
register Py_ssize_t i, mask;
register setentry *entry;
PySetObject *so = si->si_set;
if (so == NULL)
return NULL;
assert (PyAnySet_Check(so));
if (si->si_used != so->used) {
PyErr_SetString(PyExc_RuntimeError,
"Set changed size during iteration");
si->si_used = -1; /* Make this state sticky */
return NULL;
}
i = si->si_pos;
assert(i>=0);
entry = so->table;
mask = so->mask;
while (i <= mask && (entry[i].key == NULL || entry[i].key == dummy))
i++;
si->si_pos = i+1;
if (i > mask)
goto fail;
si->len--;
key = entry[i].key;
Py_INCREF(key);
return key;
fail:
Py_DECREF(so);
si->si_set = NULL;
return NULL;
}
static PyTypeObject PySetIter_Type = {
PyObject_HEAD_INIT(&PyType_Type)
0, /* ob_size */
"setiterator", /* tp_name */
sizeof(setiterobject), /* tp_basicsize */
0, /* tp_itemsize */
/* methods */
(destructor)setiter_dealloc, /* tp_dealloc */
0, /* tp_print */
0, /* tp_getattr */
0, /* tp_setattr */
0, /* tp_compare */
0, /* tp_repr */
0, /* tp_as_number */
0, /* tp_as_sequence */
0, /* tp_as_mapping */
0, /* tp_hash */
0, /* tp_call */
0, /* tp_str */
PyObject_GenericGetAttr, /* tp_getattro */
0, /* tp_setattro */
0, /* tp_as_buffer */
Py_TPFLAGS_DEFAULT, /* tp_flags */
0, /* tp_doc */
0, /* tp_traverse */
0, /* tp_clear */
0, /* tp_richcompare */
0, /* tp_weaklistoffset */
PyObject_SelfIter, /* tp_iter */
(iternextfunc)setiter_iternext, /* tp_iternext */
setiter_methods, /* tp_methods */
0,
};
static PyObject *
set_iter(PySetObject *so)
{
setiterobject *si = PyObject_New(setiterobject, &PySetIter_Type);
if (si == NULL)
return NULL;
Py_INCREF(so);
si->si_set = so;
si->si_used = so->used;
si->si_pos = 0;
si->len = so->used;
return (PyObject *)si;
}
static int
set_update_internal(PySetObject *so, PyObject *other)
{
PyObject *key, *it;
if (PyAnySet_Check(other))
return set_merge(so, other);
if (PyDict_Check(other)) {
PyObject *value;
Py_ssize_t pos = 0;
while (PyDict_Next(other, &pos, &key, &value)) {
if (set_add_key(so, key) == -1)
return -1;
}
return 0;
}
it = PyObject_GetIter(other);
if (it == NULL)
return -1;
while ((key = PyIter_Next(it)) != NULL) {
if (set_add_key(so, key) == -1) {
Py_DECREF(it);
Py_DECREF(key);
return -1;
}
Py_DECREF(key);
}
Py_DECREF(it);
if (PyErr_Occurred())
return -1;
return 0;
}
static PyObject *
set_update(PySetObject *so, PyObject *other)
{
if (set_update_internal(so, other) == -1)
return NULL;
Py_RETURN_NONE;
}
PyDoc_STRVAR(update_doc,
"Update a set with the union of itself and another.");
static PyObject *
make_new_set(PyTypeObject *type, PyObject *iterable)
{
register PySetObject *so = NULL;
if (dummy == NULL) { /* Auto-initialize dummy */
dummy = PyString_FromString("<dummy key>");
if (dummy == NULL)
return NULL;
}
/* create PySetObject structure */
if (num_free_sets &&
(type == &PySet_Type || type == &PyFrozenSet_Type)) {
so = free_sets[--num_free_sets];
assert (so != NULL && PyAnySet_CheckExact(so));
so->ob_type = type;
_Py_NewReference((PyObject *)so);
EMPTY_TO_MINSIZE(so);
PyObject_GC_Track(so);
} else {
so = (PySetObject *)type->tp_alloc(type, 0);
if (so == NULL)
return NULL;
/* tp_alloc has already zeroed the structure */
assert(so->table == NULL && so->fill == 0 && so->used == 0);
INIT_NONZERO_SET_SLOTS(so);
}
so->lookup = set_lookkey_string;
so->weakreflist = NULL;
if (iterable != NULL) {
if (set_update_internal(so, iterable) == -1) {
Py_DECREF(so);
return NULL;
}
}
return (PyObject *)so;
}
/* The empty frozenset is a singleton */
static PyObject *emptyfrozenset = NULL;
static PyObject *
frozenset_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
{
PyObject *iterable = NULL, *result;
if (!_PyArg_NoKeywords("frozenset()", kwds))
return NULL;
if (!PyArg_UnpackTuple(args, type->tp_name, 0, 1, &iterable))
return NULL;
if (type != &PyFrozenSet_Type)
return make_new_set(type, iterable);
if (iterable != NULL) {
/* frozenset(f) is idempotent */
if (PyFrozenSet_CheckExact(iterable)) {
Py_INCREF(iterable);
return iterable;
}
result = make_new_set(type, iterable);
if (result == NULL || PySet_GET_SIZE(result))
return result;
Py_DECREF(result);
}
/* The empty frozenset is a singleton */
if (emptyfrozenset == NULL)
emptyfrozenset = make_new_set(type, NULL);
Py_XINCREF(emptyfrozenset);
return emptyfrozenset;
}
void
PySet_Fini(void)
{
PySetObject *so;
while (num_free_sets) {
num_free_sets--;
so = free_sets[num_free_sets];
PyObject_GC_Del(so);
}
Py_CLEAR(dummy);
Py_CLEAR(emptyfrozenset);
}
static PyObject *
set_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
{
if (!_PyArg_NoKeywords("set()", kwds))
return NULL;
return make_new_set(type, NULL);
}
/* set_swap_bodies() switches the contents of any two sets by moving their
internal data pointers and, if needed, copying the internal smalltables.
Semantically equivalent to:
t=set(a); a.clear(); a.update(b); b.clear(); b.update(t); del t
The function always succeeds and it leaves both objects in a stable state.
Useful for creating temporary frozensets from sets for membership testing
in __contains__(), discard(), and remove(). Also useful for operations
that update in-place (by allowing an intermediate result to be swapped
into one of the original inputs).
*/
static void
set_swap_bodies(PySetObject *a, PySetObject *b)
{
Py_ssize_t t;
setentry *u;
setentry *(*f)(PySetObject *so, PyObject *key, long hash);
setentry tab[PySet_MINSIZE];
long h;
t = a->fill; a->fill = b->fill; b->fill = t;
t = a->used; a->used = b->used; b->used = t;
t = a->mask; a->mask = b->mask; b->mask = t;
u = a->table;
if (a->table == a->smalltable)
u = b->smalltable;
a->table = b->table;
if (b->table == b->smalltable)
a->table = a->smalltable;
b->table = u;
f = a->lookup; a->lookup = b->lookup; b->lookup = f;
if (a->table == a->smalltable || b->table == b->smalltable) {
memcpy(tab, a->smalltable, sizeof(tab));
memcpy(a->smalltable, b->smalltable, sizeof(tab));
memcpy(b->smalltable, tab, sizeof(tab));
}
if (PyType_IsSubtype(a->ob_type, &PyFrozenSet_Type) &&
PyType_IsSubtype(b->ob_type, &PyFrozenSet_Type)) {
h = a->hash; a->hash = b->hash; b->hash = h;
} else {
a->hash = -1;
b->hash = -1;
}
}
static PyObject *
set_copy(PySetObject *so)
{
return make_new_set(so->ob_type, (PyObject *)so);
}
static PyObject *
frozenset_copy(PySetObject *so)
{
if (PyFrozenSet_CheckExact(so)) {
Py_INCREF(so);
return (PyObject *)so;
}
return set_copy(so);
}
PyDoc_STRVAR(copy_doc, "Return a shallow copy of a set.");
static PyObject *
set_clear(PySetObject *so)
{
set_clear_internal(so);
Py_RETURN_NONE;
}
PyDoc_STRVAR(clear_doc, "Remove all elements from this set.");
static PyObject *
set_union(PySetObject *so, PyObject *other)
{
PySetObject *result;
result = (PySetObject *)set_copy(so);
if (result == NULL)
return NULL;
if ((PyObject *)so == other)
return (PyObject *)result;
if (set_update_internal(result, other) == -1) {
Py_DECREF(result);
return NULL;
}
return (PyObject *)result;
}
PyDoc_STRVAR(union_doc,
"Return the union of two sets as a new set.\n\
\n\
(i.e. all elements that are in either set.)");
static PyObject *
set_or(PySetObject *so, PyObject *other)
{
if (!PyAnySet_Check(so) || !PyAnySet_Check(other)) {
Py_INCREF(Py_NotImplemented);
return Py_NotImplemented;
}
return set_union(so, other);
}
static PyObject *
set_ior(PySetObject *so, PyObject *other)
{
if (!PyAnySet_Check(other)) {
Py_INCREF(Py_NotImplemented);
return Py_NotImplemented;
}
if (set_update_internal(so, other) == -1)
return NULL;
Py_INCREF(so);
return (PyObject *)so;
}
static PyObject *
set_intersection(PySetObject *so, PyObject *other)
{
PySetObject *result;
PyObject *key, *it, *tmp;
if ((PyObject *)so == other)
return set_copy(so);
result = (PySetObject *)make_new_set(so->ob_type, NULL);
if (result == NULL)
return NULL;
if (PyAnySet_Check(other)) {
Py_ssize_t pos = 0;
setentry *entry;
if (PySet_GET_SIZE(other) > PySet_GET_SIZE(so)) {
tmp = (PyObject *)so;
so = (PySetObject *)other;
other = tmp;
}
while (set_next((PySetObject *)other, &pos, &entry)) {
if (set_contains_entry(so, entry)) {
if (set_add_entry(result, entry) == -1) {
Py_DECREF(result);
return NULL;
}
}
}
return (PyObject *)result;
}
it = PyObject_GetIter(other);
if (it == NULL) {
Py_DECREF(result);
return NULL;
}
while ((key = PyIter_Next(it)) != NULL) {
if (set_contains_key(so, key)) {
if (set_add_key(result, key) == -1) {
Py_DECREF(it);
Py_DECREF(result);
Py_DECREF(key);
return NULL;
}
}
Py_DECREF(key);
}
Py_DECREF(it);
if (PyErr_Occurred()) {
Py_DECREF(result);
return NULL;
}
return (PyObject *)result;
}
PyDoc_STRVAR(intersection_doc,
"Return the intersection of two sets as a new set.\n\
\n\
(i.e. all elements that are in both sets.)");
static PyObject *
set_intersection_update(PySetObject *so, PyObject *other)
{
PyObject *tmp;
tmp = set_intersection(so, other);
if (tmp == NULL)
return NULL;
set_swap_bodies(so, (PySetObject *)tmp);
Py_DECREF(tmp);
Py_RETURN_NONE;
}
PyDoc_STRVAR(intersection_update_doc,
"Update a set with the intersection of itself and another.");
static PyObject *
set_and(PySetObject *so, PyObject *other)
{
if (!PyAnySet_Check(so) || !PyAnySet_Check(other)) {
Py_INCREF(Py_NotImplemented);
return Py_NotImplemented;
}
return set_intersection(so, other);
}
static PyObject *
set_iand(PySetObject *so, PyObject *other)
{
PyObject *result;
if (!PyAnySet_Check(other)) {
Py_INCREF(Py_NotImplemented);
return Py_NotImplemented;
}
result = set_intersection_update(so, other);
if (result == NULL)
return NULL;
Py_DECREF(result);
Py_INCREF(so);
return (PyObject *)so;
}
static int
set_difference_update_internal(PySetObject *so, PyObject *other)
{
if ((PyObject *)so == other)
return set_clear_internal(so);
if (PyAnySet_Check(other)) {
setentry *entry;
Py_ssize_t pos = 0;
while (set_next((PySetObject *)other, &pos, &entry))
set_discard_entry(so, entry);
} else {
PyObject *key, *it;
it = PyObject_GetIter(other);
if (it == NULL)
return -1;
while ((key = PyIter_Next(it)) != NULL) {
if (set_discard_key(so, key) == -1) {
Py_DECREF(it);
Py_DECREF(key);
return -1;
}
Py_DECREF(key);
}
Py_DECREF(it);
if (PyErr_Occurred())
return -1;
}
/* If more than 1/5 are dummies, then resize them away. */
if ((so->fill - so->used) * 5 < so->mask)
return 0;
return set_table_resize(so, so->used>50000 ? so->used*2 : so->used*4);
}
static PyObject *
set_difference_update(PySetObject *so, PyObject *other)
{
if (set_difference_update_internal(so, other) != -1)
Py_RETURN_NONE;
return NULL;
}
PyDoc_STRVAR(difference_update_doc,
"Remove all elements of another set from this set.");
static PyObject *
set_difference(PySetObject *so, PyObject *other)
{
PyObject *result;
setentry *entry;
Py_ssize_t pos = 0;
if (!PyAnySet_Check(other) && !PyDict_Check(other)) {
result = set_copy(so);
if (result == NULL)
return NULL;
if (set_difference_update_internal((PySetObject *)result, other) != -1)
return result;
Py_DECREF(result);
return NULL;
}
result = make_new_set(so->ob_type, NULL);
if (result == NULL)
return NULL;
if (PyDict_Check(other)) {
while (set_next(so, &pos, &entry)) {
setentry entrycopy;
entrycopy.hash = entry->hash;
entrycopy.key = entry->key;
if (!PyDict_Contains(other, entry->key)) {
if (set_add_entry((PySetObject *)result, &entrycopy) == -1)
return NULL;
}
}
return result;
}
while (set_next(so, &pos, &entry)) {
if (!set_contains_entry((PySetObject *)other, entry)) {
if (set_add_entry((PySetObject *)result, entry) == -1)
return NULL;
}
}
return result;
}
PyDoc_STRVAR(difference_doc,
"Return the difference of two sets as a new set.\n\
\n\
(i.e. all elements that are in this set but not the other.)");
static PyObject *
set_sub(PySetObject *so, PyObject *other)
{
if (!PyAnySet_Check(so) || !PyAnySet_Check(other)) {
Py_INCREF(Py_NotImplemented);
return Py_NotImplemented;
}
return set_difference(so, other);
}
static PyObject *
set_isub(PySetObject *so, PyObject *other)
{
PyObject *result;
if (!PyAnySet_Check(other)) {
Py_INCREF(Py_NotImplemented);
return Py_NotImplemented;
}
result = set_difference_update(so, other);
if (result == NULL)
return NULL;
Py_DECREF(result);
Py_INCREF(so);
return (PyObject *)so;
}
static PyObject *
set_symmetric_difference_update(PySetObject *so, PyObject *other)
{
PySetObject *otherset;
PyObject *key;
Py_ssize_t pos = 0;
setentry *entry;
if ((PyObject *)so == other)
return set_clear(so);
if (PyDict_Check(other)) {
PyObject *value;
int rv;
while (PyDict_Next(other, &pos, &key, &value)) {
rv = set_discard_key(so, key);
if (rv == -1)
return NULL;
if (rv == DISCARD_NOTFOUND) {
if (set_add_key(so, key) == -1)
return NULL;
}
}
Py_RETURN_NONE;
}
if (PyAnySet_Check(other)) {
Py_INCREF(other);
otherset = (PySetObject *)other;
} else {
otherset = (PySetObject *)make_new_set(so->ob_type, other);
if (otherset == NULL)
return NULL;
}
while (set_next(otherset, &pos, &entry)) {
int rv = set_discard_entry(so, entry);
if (rv == -1) {
Py_DECREF(otherset);
return NULL;
}
if (rv == DISCARD_NOTFOUND) {
if (set_add_entry(so, entry) == -1) {
Py_DECREF(otherset);
return NULL;
}
}
}
Py_DECREF(otherset);
Py_RETURN_NONE;
}
PyDoc_STRVAR(symmetric_difference_update_doc,
"Update a set with the symmetric difference of itself and another.");
static PyObject *
set_symmetric_difference(PySetObject *so, PyObject *other)
{
PyObject *rv;
PySetObject *otherset;
otherset = (PySetObject *)make_new_set(so->ob_type, other);
if (otherset == NULL)
return NULL;
rv = set_symmetric_difference_update(otherset, (PyObject *)so);
if (rv == NULL)
return NULL;
Py_DECREF(rv);
return (PyObject *)otherset;
}
PyDoc_STRVAR(symmetric_difference_doc,
"Return the symmetric difference of two sets as a new set.\n\
\n\
(i.e. all elements that are in exactly one of the sets.)");
static PyObject *
set_xor(PySetObject *so, PyObject *other)
{
if (!PyAnySet_Check(so) || !PyAnySet_Check(other)) {
Py_INCREF(Py_NotImplemented);
return Py_NotImplemented;
}
return set_symmetric_difference(so, other);
}
static PyObject *
set_ixor(PySetObject *so, PyObject *other)
{
PyObject *result;
if (!PyAnySet_Check(other)) {
Py_INCREF(Py_NotImplemented);
return Py_NotImplemented;
}
result = set_symmetric_difference_update(so, other);
if (result == NULL)
return NULL;
Py_DECREF(result);
Py_INCREF(so);
return (PyObject *)so;
}
static PyObject *
set_issubset(PySetObject *so, PyObject *other)
{
setentry *entry;
Py_ssize_t pos = 0;
if (!PyAnySet_Check(other)) {
PyObject *tmp, *result;
tmp = make_new_set(&PySet_Type, other);
if (tmp == NULL)
return NULL;
result = set_issubset(so, tmp);
Py_DECREF(tmp);
return result;
}
if (PySet_GET_SIZE(so) > PySet_GET_SIZE(other))
Py_RETURN_FALSE;
while (set_next(so, &pos, &entry)) {
if (!set_contains_entry((PySetObject *)other, entry))
Py_RETURN_FALSE;
}
Py_RETURN_TRUE;
}
PyDoc_STRVAR(issubset_doc, "Report whether another set contains this set.");
static PyObject *
set_issuperset(PySetObject *so, PyObject *other)
{
PyObject *tmp, *result;
if (!PyAnySet_Check(other)) {
tmp = make_new_set(&PySet_Type, other);
if (tmp == NULL)
return NULL;
result = set_issuperset(so, tmp);
Py_DECREF(tmp);
return result;
}
return set_issubset((PySetObject *)other, (PyObject *)so);
}
PyDoc_STRVAR(issuperset_doc, "Report whether this set contains another set.");
static PyObject *
set_richcompare(PySetObject *v, PyObject *w, int op)
{
PyObject *r1, *r2;
if(!PyAnySet_Check(w)) {
if (op == Py_EQ)
Py_RETURN_FALSE;
if (op == Py_NE)
Py_RETURN_TRUE;
PyErr_SetString(PyExc_TypeError, "can only compare to a set");
return NULL;
}
switch (op) {
case Py_EQ:
if (PySet_GET_SIZE(v) != PySet_GET_SIZE(w))
Py_RETURN_FALSE;
if (v->hash != -1 &&
((PySetObject *)w)->hash != -1 &&
v->hash != ((PySetObject *)w)->hash)
Py_RETURN_FALSE;
return set_issubset(v, w);
case Py_NE:
r1 = set_richcompare(v, w, Py_EQ);
if (r1 == NULL)
return NULL;
r2 = PyBool_FromLong(PyObject_Not(r1));
Py_DECREF(r1);
return r2;
case Py_LE:
return set_issubset(v, w);
case Py_GE:
return set_issuperset(v, w);
case Py_LT:
if (PySet_GET_SIZE(v) >= PySet_GET_SIZE(w))
Py_RETURN_FALSE;
return set_issubset(v, w);
case Py_GT:
if (PySet_GET_SIZE(v) <= PySet_GET_SIZE(w))
Py_RETURN_FALSE;
return set_issuperset(v, w);
}
Py_INCREF(Py_NotImplemented);
return Py_NotImplemented;
}
static int
set_nocmp(PyObject *self, PyObject *other)
{
PyErr_SetString(PyExc_TypeError, "cannot compare sets using cmp()");
return -1;
}
static PyObject *
set_add(PySetObject *so, PyObject *key)
{
if (set_add_key(so, key) == -1)
return NULL;
Py_RETURN_NONE;
}
PyDoc_STRVAR(add_doc,
"Add an element to a set.\n\
\n\
This has no effect if the element is already present.");
static int
set_contains(PySetObject *so, PyObject *key)
{
PyObject *tmpkey;
int rv;
rv = set_contains_key(so, key);
if (rv == -1) {
if (!PyAnySet_Check(key) || !PyErr_ExceptionMatches(PyExc_TypeError))
return -1;
PyErr_Clear();
tmpkey = make_new_set(&PyFrozenSet_Type, NULL);
if (tmpkey == NULL)
return -1;
set_swap_bodies((PySetObject *)tmpkey, (PySetObject *)key);
rv = set_contains(so, tmpkey);
set_swap_bodies((PySetObject *)tmpkey, (PySetObject *)key);
Py_DECREF(tmpkey);
}
return rv;
}
static PyObject *
set_direct_contains(PySetObject *so, PyObject *key)
{
long result;
result = set_contains(so, key);
if (result == -1)
return NULL;
return PyBool_FromLong(result);
}
PyDoc_STRVAR(contains_doc, "x.__contains__(y) <==> y in x.");
static PyObject *
set_remove(PySetObject *so, PyObject *key)
{
PyObject *tmpkey, *result;
int rv;
rv = set_discard_key(so, key);
if (rv == -1) {
if (!PyAnySet_Check(key) || !PyErr_ExceptionMatches(PyExc_TypeError))
return NULL;
PyErr_Clear();
tmpkey = make_new_set(&PyFrozenSet_Type, NULL);
if (tmpkey == NULL)
return NULL;
set_swap_bodies((PySetObject *)tmpkey, (PySetObject *)key);
result = set_remove(so, tmpkey);
set_swap_bodies((PySetObject *)tmpkey, (PySetObject *)key);
Py_DECREF(tmpkey);
return result;
} else if (rv == DISCARD_NOTFOUND) {
PyErr_SetObject(PyExc_KeyError, key);
return NULL;
}
Py_RETURN_NONE;
}
PyDoc_STRVAR(remove_doc,
"Remove an element from a set; it must be a member.\n\
\n\
If the element is not a member, raise a KeyError.");
static PyObject *
set_discard(PySetObject *so, PyObject *key)
{
PyObject *tmpkey, *result;
int rv;
rv = set_discard_key(so, key);
if (rv == -1) {
if (!PyAnySet_Check(key) || !PyErr_ExceptionMatches(PyExc_TypeError))
return NULL;
PyErr_Clear();
tmpkey = make_new_set(&PyFrozenSet_Type, NULL);
if (tmpkey == NULL)
return NULL;
set_swap_bodies((PySetObject *)tmpkey, (PySetObject *)key);
result = set_discard(so, tmpkey);
set_swap_bodies((PySetObject *)tmpkey, (PySetObject *)key);
Py_DECREF(tmpkey);
return result;
}
Py_RETURN_NONE;
}
PyDoc_STRVAR(discard_doc,
"Remove an element from a set if it is a member.\n\
\n\
If the element is not a member, do nothing.");
static PyObject *
set_reduce(PySetObject *so)
{
PyObject *keys=NULL, *args=NULL, *result=NULL, *dict=NULL;
keys = PySequence_List((PyObject *)so);
if (keys == NULL)
goto done;
args = PyTuple_Pack(1, keys);
if (args == NULL)
goto done;
dict = PyObject_GetAttrString((PyObject *)so, "__dict__");
if (dict == NULL) {
PyErr_Clear();
dict = Py_None;
Py_INCREF(dict);
}
result = PyTuple_Pack(3, so->ob_type, args, dict);
done:
Py_XDECREF(args);
Py_XDECREF(keys);
Py_XDECREF(dict);
return result;
}
PyDoc_STRVAR(reduce_doc, "Return state information for pickling.");
static int
set_init(PySetObject *self, PyObject *args, PyObject *kwds)
{
PyObject *iterable = NULL;
if (!PyAnySet_Check(self))
return -1;
if (!PyArg_UnpackTuple(args, self->ob_type->tp_name, 0, 1, &iterable))
return -1;
set_clear_internal(self);
self->hash = -1;
if (iterable == NULL)
return 0;
return set_update_internal(self, iterable);
}
static PySequenceMethods set_as_sequence = {
set_len, /* sq_length */
0, /* sq_concat */
0, /* sq_repeat */
0, /* sq_item */
0, /* sq_slice */
0, /* sq_ass_item */
0, /* sq_ass_slice */
(objobjproc)set_contains, /* sq_contains */
};
/* set object ********************************************************/
#ifdef Py_DEBUG
static PyObject *test_c_api(PySetObject *so);
PyDoc_STRVAR(test_c_api_doc, "Exercises C API. Returns True.\n\
All is well if assertions don't fail.");
#endif
static PyMethodDef set_methods[] = {
{"add", (PyCFunction)set_add, METH_O,
add_doc},
{"clear", (PyCFunction)set_clear, METH_NOARGS,
clear_doc},
{"__contains__",(PyCFunction)set_direct_contains, METH_O | METH_COEXIST,
contains_doc},
{"copy", (PyCFunction)set_copy, METH_NOARGS,
copy_doc},
{"discard", (PyCFunction)set_discard, METH_O,
discard_doc},
{"difference", (PyCFunction)set_difference, METH_O,
difference_doc},
{"difference_update", (PyCFunction)set_difference_update, METH_O,
difference_update_doc},
{"intersection",(PyCFunction)set_intersection, METH_O,
intersection_doc},
{"intersection_update",(PyCFunction)set_intersection_update, METH_O,
intersection_update_doc},
{"issubset", (PyCFunction)set_issubset, METH_O,
issubset_doc},
{"issuperset", (PyCFunction)set_issuperset, METH_O,
issuperset_doc},
{"pop", (PyCFunction)set_pop, METH_NOARGS,
pop_doc},
{"__reduce__", (PyCFunction)set_reduce, METH_NOARGS,
reduce_doc},
{"remove", (PyCFunction)set_remove, METH_O,
remove_doc},
{"symmetric_difference",(PyCFunction)set_symmetric_difference, METH_O,
symmetric_difference_doc},
{"symmetric_difference_update",(PyCFunction)set_symmetric_difference_update, METH_O,
symmetric_difference_update_doc},
#ifdef Py_DEBUG
{"test_c_api", (PyCFunction)test_c_api, METH_NOARGS,
test_c_api_doc},
#endif
{"union", (PyCFunction)set_union, METH_O,
union_doc},
{"update", (PyCFunction)set_update, METH_O,
update_doc},
{NULL, NULL} /* sentinel */
};
static PyNumberMethods set_as_number = {
0, /*nb_add*/
(binaryfunc)set_sub, /*nb_subtract*/
0, /*nb_multiply*/
0, /*nb_divide*/
0, /*nb_remainder*/
0, /*nb_divmod*/
0, /*nb_power*/
0, /*nb_negative*/
0, /*nb_positive*/
0, /*nb_absolute*/
0, /*nb_nonzero*/
0, /*nb_invert*/
0, /*nb_lshift*/
0, /*nb_rshift*/
(binaryfunc)set_and, /*nb_and*/
(binaryfunc)set_xor, /*nb_xor*/
(binaryfunc)set_or, /*nb_or*/
0, /*nb_coerce*/
0, /*nb_int*/
0, /*nb_long*/
0, /*nb_float*/
0, /*nb_oct*/
0, /*nb_hex*/
0, /*nb_inplace_add*/
(binaryfunc)set_isub, /*nb_inplace_subtract*/
0, /*nb_inplace_multiply*/
0, /*nb_inplace_divide*/
0, /*nb_inplace_remainder*/
0, /*nb_inplace_power*/
0, /*nb_inplace_lshift*/
0, /*nb_inplace_rshift*/
(binaryfunc)set_iand, /*nb_inplace_and*/
(binaryfunc)set_ixor, /*nb_inplace_xor*/
(binaryfunc)set_ior, /*nb_inplace_or*/
};
PyDoc_STRVAR(set_doc,
"set(iterable) --> set object\n\
\n\
Build an unordered collection.");
PyTypeObject PySet_Type = {
PyObject_HEAD_INIT(&PyType_Type)
0, /* ob_size */
"set", /* tp_name */
sizeof(PySetObject), /* tp_basicsize */
0, /* tp_itemsize */
/* methods */
(destructor)set_dealloc, /* tp_dealloc */
(printfunc)set_tp_print, /* tp_print */
0, /* tp_getattr */
0, /* tp_setattr */
set_nocmp, /* tp_compare */
(reprfunc)set_repr, /* tp_repr */
&set_as_number, /* tp_as_number */
&set_as_sequence, /* tp_as_sequence */
0, /* tp_as_mapping */
set_nohash, /* tp_hash */
0, /* tp_call */
0, /* tp_str */
PyObject_GenericGetAttr, /* tp_getattro */
0, /* tp_setattro */
0, /* tp_as_buffer */
Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC | Py_TPFLAGS_CHECKTYPES |
Py_TPFLAGS_BASETYPE, /* tp_flags */
set_doc, /* tp_doc */
(traverseproc)set_traverse, /* tp_traverse */
(inquiry)set_clear_internal, /* tp_clear */
(richcmpfunc)set_richcompare, /* tp_richcompare */
offsetof(PySetObject, weakreflist), /* tp_weaklistoffset */
(getiterfunc)set_iter, /* tp_iter */
0, /* tp_iternext */
set_methods, /* tp_methods */
0, /* tp_members */
0, /* tp_getset */
0, /* tp_base */
0, /* tp_dict */
0, /* tp_descr_get */
0, /* tp_descr_set */
0, /* tp_dictoffset */
(initproc)set_init, /* tp_init */
PyType_GenericAlloc, /* tp_alloc */
set_new, /* tp_new */
PyObject_GC_Del, /* tp_free */
};
/* frozenset object ********************************************************/
static PyMethodDef frozenset_methods[] = {
{"__contains__",(PyCFunction)set_direct_contains, METH_O | METH_COEXIST,
contains_doc},
{"copy", (PyCFunction)frozenset_copy, METH_NOARGS,
copy_doc},
{"difference", (PyCFunction)set_difference, METH_O,
difference_doc},
{"intersection",(PyCFunction)set_intersection, METH_O,
intersection_doc},
{"issubset", (PyCFunction)set_issubset, METH_O,
issubset_doc},
{"issuperset", (PyCFunction)set_issuperset, METH_O,
issuperset_doc},
{"__reduce__", (PyCFunction)set_reduce, METH_NOARGS,
reduce_doc},
{"symmetric_difference",(PyCFunction)set_symmetric_difference, METH_O,
symmetric_difference_doc},
{"union", (PyCFunction)set_union, METH_O,
union_doc},
{NULL, NULL} /* sentinel */
};
static PyNumberMethods frozenset_as_number = {
0, /*nb_add*/
(binaryfunc)set_sub, /*nb_subtract*/
0, /*nb_multiply*/
0, /*nb_divide*/
0, /*nb_remainder*/
0, /*nb_divmod*/
0, /*nb_power*/
0, /*nb_negative*/
0, /*nb_positive*/
0, /*nb_absolute*/
0, /*nb_nonzero*/
0, /*nb_invert*/
0, /*nb_lshift*/
0, /*nb_rshift*/
(binaryfunc)set_and, /*nb_and*/
(binaryfunc)set_xor, /*nb_xor*/
(binaryfunc)set_or, /*nb_or*/
};
PyDoc_STRVAR(frozenset_doc,
"frozenset(iterable) --> frozenset object\n\
\n\
Build an immutable unordered collection.");
PyTypeObject PyFrozenSet_Type = {
PyObject_HEAD_INIT(&PyType_Type)
0, /* ob_size */
"frozenset", /* tp_name */
sizeof(PySetObject), /* tp_basicsize */
0, /* tp_itemsize */
/* methods */
(destructor)set_dealloc, /* tp_dealloc */
(printfunc)set_tp_print, /* tp_print */
0, /* tp_getattr */
0, /* tp_setattr */
set_nocmp, /* tp_compare */
(reprfunc)set_repr, /* tp_repr */
&frozenset_as_number, /* tp_as_number */
&set_as_sequence, /* tp_as_sequence */
0, /* tp_as_mapping */
frozenset_hash, /* tp_hash */
0, /* tp_call */
0, /* tp_str */
PyObject_GenericGetAttr, /* tp_getattro */
0, /* tp_setattro */
0, /* tp_as_buffer */
Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC | Py_TPFLAGS_CHECKTYPES |
Py_TPFLAGS_BASETYPE, /* tp_flags */
frozenset_doc, /* tp_doc */
(traverseproc)set_traverse, /* tp_traverse */
(inquiry)set_clear_internal, /* tp_clear */
(richcmpfunc)set_richcompare, /* tp_richcompare */
offsetof(PySetObject, weakreflist), /* tp_weaklistoffset */
(getiterfunc)set_iter, /* tp_iter */
0, /* tp_iternext */
frozenset_methods, /* tp_methods */
0, /* tp_members */
0, /* tp_getset */
0, /* tp_base */
0, /* tp_dict */
0, /* tp_descr_get */
0, /* tp_descr_set */
0, /* tp_dictoffset */
0, /* tp_init */
PyType_GenericAlloc, /* tp_alloc */
frozenset_new, /* tp_new */
PyObject_GC_Del, /* tp_free */
};
/***** C API functions *************************************************/
PyObject *
PySet_New(PyObject *iterable)
{
return make_new_set(&PySet_Type, iterable);
}
PyObject *
PyFrozenSet_New(PyObject *iterable)
{
PyObject *args, *result;
if (iterable == NULL)
args = PyTuple_New(0);
else
args = PyTuple_Pack(1, iterable);
if (args == NULL)
return NULL;
result = frozenset_new(&PyFrozenSet_Type, args, NULL);
Py_DECREF(args);
return result;
}
Py_ssize_t
PySet_Size(PyObject *anyset)
{
if (!PyAnySet_Check(anyset)) {
PyErr_BadInternalCall();
return -1;
}
return PySet_GET_SIZE(anyset);
}
int
PySet_Clear(PyObject *set)
{
if (!PyType_IsSubtype(set->ob_type, &PySet_Type)) {
PyErr_BadInternalCall();
return -1;
}
return set_clear_internal((PySetObject *)set);
}
int
PySet_Contains(PyObject *anyset, PyObject *key)
{
if (!PyAnySet_Check(anyset)) {
PyErr_BadInternalCall();
return -1;
}
return set_contains_key((PySetObject *)anyset, key);
}
int
PySet_Discard(PyObject *set, PyObject *key)
{
if (!PyType_IsSubtype(set->ob_type, &PySet_Type)) {
PyErr_BadInternalCall();
return -1;
}
return set_discard_key((PySetObject *)set, key);
}
int
PySet_Add(PyObject *set, PyObject *key)
{
if (!PyType_IsSubtype(set->ob_type, &PySet_Type)) {
PyErr_BadInternalCall();
return -1;
}
return set_add_key((PySetObject *)set, key);
}
int
_PySet_Next(PyObject *set, Py_ssize_t *pos, PyObject **entry)
{
setentry *entry_ptr;
if (!PyAnySet_Check(set)) {
PyErr_BadInternalCall();
return -1;
}
if (set_next((PySetObject *)set, pos, &entry_ptr) == 0)
return 0;
*entry = entry_ptr->key;
return 1;
}
PyObject *
PySet_Pop(PyObject *set)
{
if (!PyType_IsSubtype(set->ob_type, &PySet_Type)) {
PyErr_BadInternalCall();
return NULL;
}
return set_pop((PySetObject *)set);
}
int
_PySet_Update(PyObject *set, PyObject *iterable)
{
if (!PyType_IsSubtype(set->ob_type, &PySet_Type)) {
PyErr_BadInternalCall();
return -1;
}
return set_update_internal((PySetObject *)set, iterable);
}
#ifdef Py_DEBUG
/* Test code to be called with any three element set.
Returns True and original set is restored. */
#define assertRaises(call_return_value, exception) \
do { \
assert(call_return_value); \
assert(PyErr_ExceptionMatches(exception)); \
PyErr_Clear(); \
} while(0)
static PyObject *
test_c_api(PySetObject *so)
{
Py_ssize_t count;
char *s;
Py_ssize_t i;
PyObject *elem, *dup, *t, *f, *dup2;
PyObject *ob = (PyObject *)so;
/* Verify preconditions and exercise type/size checks */
assert(PyAnySet_Check(ob));
assert(PyAnySet_CheckExact(ob));
assert(!PyFrozenSet_CheckExact(ob));
assert(PySet_Size(ob) == 3);
assert(PySet_GET_SIZE(ob) == 3);
/* Raise TypeError for non-iterable constructor arguments */
assertRaises(PySet_New(Py_None) == NULL, PyExc_TypeError);
assertRaises(PyFrozenSet_New(Py_None) == NULL, PyExc_TypeError);
/* Raise TypeError for unhashable key */
dup = PySet_New(ob);
assertRaises(PySet_Discard(ob, dup) == -1, PyExc_TypeError);
assertRaises(PySet_Contains(ob, dup) == -1, PyExc_TypeError);
assertRaises(PySet_Add(ob, dup) == -1, PyExc_TypeError);
/* Exercise successful pop, contains, add, and discard */
elem = PySet_Pop(ob);
assert(PySet_Contains(ob, elem) == 0);
assert(PySet_GET_SIZE(ob) == 2);
assert(PySet_Add(ob, elem) == 0);
assert(PySet_Contains(ob, elem) == 1);
assert(PySet_GET_SIZE(ob) == 3);
assert(PySet_Discard(ob, elem) == 1);
assert(PySet_GET_SIZE(ob) == 2);
assert(PySet_Discard(ob, elem) == 0);
assert(PySet_GET_SIZE(ob) == 2);
/* Exercise clear */
dup2 = PySet_New(dup);
assert(PySet_Clear(dup2) == 0);
assert(PySet_Size(dup2) == 0);
Py_DECREF(dup2);
/* Raise SystemError on clear or update of frozen set */
f = PyFrozenSet_New(dup);
assertRaises(PySet_Clear(f) == -1, PyExc_SystemError);
assertRaises(_PySet_Update(f, dup) == -1, PyExc_SystemError);
Py_DECREF(f);
/* Exercise direct iteration */
i = 0, count = 0;
while (_PySet_Next((PyObject *)dup, &i, &elem)) {
s = PyString_AsString(elem);
assert(s && (s[0] == 'a' || s[0] == 'b' || s[0] == 'c'));
count++;
}
assert(count == 3);
/* Exercise updates */
dup2 = PySet_New(NULL);
assert(_PySet_Update(dup2, dup) == 0);
assert(PySet_Size(dup2) == 3);
assert(_PySet_Update(dup2, dup) == 0);
assert(PySet_Size(dup2) == 3);
Py_DECREF(dup2);
/* Raise SystemError when self argument is not a set or frozenset. */
t = PyTuple_New(0);
assertRaises(PySet_Size(t) == -1, PyExc_SystemError);
assertRaises(PySet_Contains(t, elem) == -1, PyExc_SystemError);
Py_DECREF(t);
/* Raise SystemError when self argument is not a set. */
f = PyFrozenSet_New(dup);
assert(PySet_Size(f) == 3);
assert(PyFrozenSet_CheckExact(f));
assertRaises(PySet_Add(f, elem) == -1, PyExc_SystemError);
assertRaises(PySet_Discard(f, elem) == -1, PyExc_SystemError);
assertRaises(PySet_Pop(f) == NULL, PyExc_SystemError);
Py_DECREF(f);
/* Raise KeyError when popping from an empty set */
assert(PyNumber_InPlaceSubtract(ob, ob) == ob);
Py_DECREF(ob);
assert(PySet_GET_SIZE(ob) == 0);
assertRaises(PySet_Pop(ob) == NULL, PyExc_KeyError);
/* Restore the set from the copy using the PyNumber API */
assert(PyNumber_InPlaceOr(ob, dup) == ob);
Py_DECREF(ob);
/* Verify constructors accept NULL arguments */
f = PySet_New(NULL);
assert(f != NULL);
assert(PySet_GET_SIZE(f) == 0);
Py_DECREF(f);
f = PyFrozenSet_New(NULL);
assert(f != NULL);
assert(PyFrozenSet_CheckExact(f));
assert(PySet_GET_SIZE(f) == 0);
Py_DECREF(f);
Py_DECREF(elem);
Py_DECREF(dup);
Py_RETURN_TRUE;
}
#undef assertRaises
#endif
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