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itertoolsmodule.c
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4556 lines (4047 loc) · 142 KB
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#include "Python.h"
#include "structmember.h"
/* Itertools module written and maintained
by Raymond D. Hettinger <python@rcn.com>
*/
/* groupby object ***********************************************************/
typedef struct {
PyObject_HEAD
PyObject *it;
PyObject *keyfunc;
PyObject *tgtkey;
PyObject *currkey;
PyObject *currvalue;
} groupbyobject;
static PyTypeObject groupby_type;
static PyObject *_grouper_create(groupbyobject *, PyObject *);
static PyObject *
groupby_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
{
static char *kwargs[] = {"iterable", "key", NULL};
groupbyobject *gbo;
PyObject *it, *keyfunc = Py_None;
if (!PyArg_ParseTupleAndKeywords(args, kwds, "O|O:groupby", kwargs,
&it, &keyfunc))
return NULL;
gbo = (groupbyobject *)type->tp_alloc(type, 0);
if (gbo == NULL)
return NULL;
gbo->tgtkey = NULL;
gbo->currkey = NULL;
gbo->currvalue = NULL;
gbo->keyfunc = keyfunc;
Py_INCREF(keyfunc);
gbo->it = PyObject_GetIter(it);
if (gbo->it == NULL) {
Py_DECREF(gbo);
return NULL;
}
return (PyObject *)gbo;
}
static void
groupby_dealloc(groupbyobject *gbo)
{
PyObject_GC_UnTrack(gbo);
Py_XDECREF(gbo->it);
Py_XDECREF(gbo->keyfunc);
Py_XDECREF(gbo->tgtkey);
Py_XDECREF(gbo->currkey);
Py_XDECREF(gbo->currvalue);
Py_TYPE(gbo)->tp_free(gbo);
}
static int
groupby_traverse(groupbyobject *gbo, visitproc visit, void *arg)
{
Py_VISIT(gbo->it);
Py_VISIT(gbo->keyfunc);
Py_VISIT(gbo->tgtkey);
Py_VISIT(gbo->currkey);
Py_VISIT(gbo->currvalue);
return 0;
}
static PyObject *
groupby_next(groupbyobject *gbo)
{
PyObject *newvalue, *newkey, *r, *grouper, *tmp;
/* skip to next iteration group */
for (;;) {
if (gbo->currkey == NULL)
/* pass */;
else if (gbo->tgtkey == NULL)
break;
else {
int rcmp;
rcmp = PyObject_RichCompareBool(gbo->tgtkey,
gbo->currkey, Py_EQ);
if (rcmp == -1)
return NULL;
else if (rcmp == 0)
break;
}
newvalue = PyIter_Next(gbo->it);
if (newvalue == NULL)
return NULL;
if (gbo->keyfunc == Py_None) {
newkey = newvalue;
Py_INCREF(newvalue);
} else {
newkey = PyObject_CallFunctionObjArgs(gbo->keyfunc,
newvalue, NULL);
if (newkey == NULL) {
Py_DECREF(newvalue);
return NULL;
}
}
tmp = gbo->currkey;
gbo->currkey = newkey;
Py_XDECREF(tmp);
tmp = gbo->currvalue;
gbo->currvalue = newvalue;
Py_XDECREF(tmp);
}
Py_INCREF(gbo->currkey);
tmp = gbo->tgtkey;
gbo->tgtkey = gbo->currkey;
Py_XDECREF(tmp);
grouper = _grouper_create(gbo, gbo->tgtkey);
if (grouper == NULL)
return NULL;
r = PyTuple_Pack(2, gbo->currkey, grouper);
Py_DECREF(grouper);
return r;
}
static PyObject *
groupby_reduce(groupbyobject *lz)
{
/* reduce as a 'new' call with an optional 'setstate' if groupby
* has started
*/
PyObject *value;
if (lz->tgtkey && lz->currkey && lz->currvalue)
value = Py_BuildValue("O(OO)(OOO)", Py_TYPE(lz),
lz->it, lz->keyfunc, lz->currkey, lz->currvalue, lz->tgtkey);
else
value = Py_BuildValue("O(OO)", Py_TYPE(lz),
lz->it, lz->keyfunc);
return value;
}
PyDoc_STRVAR(reduce_doc, "Return state information for pickling.");
static PyObject *
groupby_setstate(groupbyobject *lz, PyObject *state)
{
PyObject *currkey, *currvalue, *tgtkey;
if (!PyArg_ParseTuple(state, "OOO", &currkey, &currvalue, &tgtkey))
return NULL;
Py_CLEAR(lz->currkey);
lz->currkey = currkey;
Py_INCREF(lz->currkey);
Py_CLEAR(lz->currvalue);
lz->currvalue = currvalue;
Py_INCREF(lz->currvalue);
Py_CLEAR(lz->tgtkey);
lz->tgtkey = tgtkey;
Py_INCREF(lz->tgtkey);
Py_RETURN_NONE;
}
PyDoc_STRVAR(setstate_doc, "Set state information for unpickling.");
static PyMethodDef groupby_methods[] = {
{"__reduce__", (PyCFunction)groupby_reduce, METH_NOARGS,
reduce_doc},
{"__setstate__", (PyCFunction)groupby_setstate, METH_O,
setstate_doc},
{NULL, NULL} /* sentinel */
};
PyDoc_STRVAR(groupby_doc,
"groupby(iterable[, keyfunc]) -> create an iterator which returns\n\
(key, sub-iterator) grouped by each value of key(value).\n");
static PyTypeObject groupby_type = {
PyVarObject_HEAD_INIT(NULL, 0)
"itertools.groupby", /* tp_name */
sizeof(groupbyobject), /* tp_basicsize */
0, /* tp_itemsize */
/* methods */
(destructor)groupby_dealloc, /* tp_dealloc */
0, /* tp_print */
0, /* tp_getattr */
0, /* tp_setattr */
0, /* tp_reserved */
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 | Py_TPFLAGS_HAVE_GC |
Py_TPFLAGS_BASETYPE, /* tp_flags */
groupby_doc, /* tp_doc */
(traverseproc)groupby_traverse, /* tp_traverse */
0, /* tp_clear */
0, /* tp_richcompare */
0, /* tp_weaklistoffset */
PyObject_SelfIter, /* tp_iter */
(iternextfunc)groupby_next, /* tp_iternext */
groupby_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 */
0, /* tp_alloc */
groupby_new, /* tp_new */
PyObject_GC_Del, /* tp_free */
};
/* _grouper object (internal) ************************************************/
typedef struct {
PyObject_HEAD
PyObject *parent;
PyObject *tgtkey;
} _grouperobject;
static PyTypeObject _grouper_type;
static PyObject *
_grouper_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
{
PyObject *parent, *tgtkey;
if (!PyArg_ParseTuple(args, "O!O", &groupby_type, &parent, &tgtkey))
return NULL;
return _grouper_create((groupbyobject*) parent, tgtkey);
}
static PyObject *
_grouper_create(groupbyobject *parent, PyObject *tgtkey)
{
_grouperobject *igo;
igo = PyObject_GC_New(_grouperobject, &_grouper_type);
if (igo == NULL)
return NULL;
igo->parent = (PyObject *)parent;
Py_INCREF(parent);
igo->tgtkey = tgtkey;
Py_INCREF(tgtkey);
PyObject_GC_Track(igo);
return (PyObject *)igo;
}
static void
_grouper_dealloc(_grouperobject *igo)
{
PyObject_GC_UnTrack(igo);
Py_DECREF(igo->parent);
Py_DECREF(igo->tgtkey);
PyObject_GC_Del(igo);
}
static int
_grouper_traverse(_grouperobject *igo, visitproc visit, void *arg)
{
Py_VISIT(igo->parent);
Py_VISIT(igo->tgtkey);
return 0;
}
static PyObject *
_grouper_next(_grouperobject *igo)
{
groupbyobject *gbo = (groupbyobject *)igo->parent;
PyObject *newvalue, *newkey, *r;
int rcmp;
if (gbo->currvalue == NULL) {
newvalue = PyIter_Next(gbo->it);
if (newvalue == NULL)
return NULL;
if (gbo->keyfunc == Py_None) {
newkey = newvalue;
Py_INCREF(newvalue);
} else {
newkey = PyObject_CallFunctionObjArgs(gbo->keyfunc,
newvalue, NULL);
if (newkey == NULL) {
Py_DECREF(newvalue);
return NULL;
}
}
assert(gbo->currkey == NULL);
gbo->currkey = newkey;
gbo->currvalue = newvalue;
}
assert(gbo->currkey != NULL);
rcmp = PyObject_RichCompareBool(igo->tgtkey, gbo->currkey, Py_EQ);
if (rcmp <= 0)
/* got any error or current group is end */
return NULL;
r = gbo->currvalue;
gbo->currvalue = NULL;
Py_CLEAR(gbo->currkey);
return r;
}
static PyObject *
_grouper_reduce(_grouperobject *lz)
{
return Py_BuildValue("O(OO)", Py_TYPE(lz),
lz->parent, lz->tgtkey);
}
static PyMethodDef _grouper_methods[] = {
{"__reduce__", (PyCFunction)_grouper_reduce, METH_NOARGS,
reduce_doc},
{NULL, NULL} /* sentinel */
};
static PyTypeObject _grouper_type = {
PyVarObject_HEAD_INIT(NULL, 0)
"itertools._grouper", /* tp_name */
sizeof(_grouperobject), /* tp_basicsize */
0, /* tp_itemsize */
/* methods */
(destructor)_grouper_dealloc, /* tp_dealloc */
0, /* tp_print */
0, /* tp_getattr */
0, /* tp_setattr */
0, /* tp_reserved */
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 | Py_TPFLAGS_HAVE_GC, /* tp_flags */
0, /* tp_doc */
(traverseproc)_grouper_traverse,/* tp_traverse */
0, /* tp_clear */
0, /* tp_richcompare */
0, /* tp_weaklistoffset */
PyObject_SelfIter, /* tp_iter */
(iternextfunc)_grouper_next, /* tp_iternext */
_grouper_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 */
0, /* tp_alloc */
_grouper_new, /* tp_new */
PyObject_GC_Del, /* tp_free */
};
/* tee object and with supporting function and objects ***************/
/* The teedataobject pre-allocates space for LINKCELLS number of objects.
To help the object fit neatly inside cache lines (space for 16 to 32
pointers), the value should be a multiple of 16 minus space for
the other structure members including PyHEAD overhead. The larger the
value, the less memory overhead per object and the less time spent
allocating/deallocating new links. The smaller the number, the less
wasted space and the more rapid freeing of older data.
*/
#define LINKCELLS 57
typedef struct {
PyObject_HEAD
PyObject *it;
int numread;
PyObject *nextlink;
PyObject *(values[LINKCELLS]);
} teedataobject;
typedef struct {
PyObject_HEAD
teedataobject *dataobj;
int index;
PyObject *weakreflist;
} teeobject;
static PyTypeObject teedataobject_type;
static PyObject *
teedataobject_newinternal(PyObject *it)
{
teedataobject *tdo;
tdo = PyObject_GC_New(teedataobject, &teedataobject_type);
if (tdo == NULL)
return NULL;
tdo->numread = 0;
tdo->nextlink = NULL;
Py_INCREF(it);
tdo->it = it;
PyObject_GC_Track(tdo);
return (PyObject *)tdo;
}
static PyObject *
teedataobject_jumplink(teedataobject *tdo)
{
if (tdo->nextlink == NULL)
tdo->nextlink = teedataobject_newinternal(tdo->it);
Py_XINCREF(tdo->nextlink);
return tdo->nextlink;
}
static PyObject *
teedataobject_getitem(teedataobject *tdo, int i)
{
PyObject *value;
assert(i < LINKCELLS);
if (i < tdo->numread)
value = tdo->values[i];
else {
/* this is the lead iterator, so fetch more data */
assert(i == tdo->numread);
value = PyIter_Next(tdo->it);
if (value == NULL)
return NULL;
tdo->numread++;
tdo->values[i] = value;
}
Py_INCREF(value);
return value;
}
static int
teedataobject_traverse(teedataobject *tdo, visitproc visit, void * arg)
{
int i;
Py_VISIT(tdo->it);
for (i = 0; i < tdo->numread; i++)
Py_VISIT(tdo->values[i]);
Py_VISIT(tdo->nextlink);
return 0;
}
static void
teedataobject_safe_decref(PyObject *obj)
{
while (obj && Py_TYPE(obj) == &teedataobject_type &&
Py_REFCNT(obj) == 1) {
PyObject *nextlink = ((teedataobject *)obj)->nextlink;
((teedataobject *)obj)->nextlink = NULL;
Py_DECREF(obj);
obj = nextlink;
}
Py_XDECREF(obj);
}
static int
teedataobject_clear(teedataobject *tdo)
{
int i;
PyObject *tmp;
Py_CLEAR(tdo->it);
for (i=0 ; i<tdo->numread ; i++)
Py_CLEAR(tdo->values[i]);
tmp = tdo->nextlink;
tdo->nextlink = NULL;
teedataobject_safe_decref(tmp);
return 0;
}
static void
teedataobject_dealloc(teedataobject *tdo)
{
PyObject_GC_UnTrack(tdo);
teedataobject_clear(tdo);
PyObject_GC_Del(tdo);
}
static PyObject *
teedataobject_reduce(teedataobject *tdo)
{
int i;
/* create a temporary list of already iterated values */
PyObject *values = PyList_New(tdo->numread);
if (!values)
return NULL;
for (i=0 ; i<tdo->numread ; i++) {
Py_INCREF(tdo->values[i]);
PyList_SET_ITEM(values, i, tdo->values[i]);
}
return Py_BuildValue("O(ONO)", Py_TYPE(tdo), tdo->it,
values,
tdo->nextlink ? tdo->nextlink : Py_None);
}
static PyTypeObject teedataobject_type;
static PyObject *
teedataobject_new(PyTypeObject *type, PyObject *args, PyObject *kw)
{
teedataobject *tdo;
PyObject *it, *values, *next;
Py_ssize_t i, len;
assert(type == &teedataobject_type);
if (!PyArg_ParseTuple(args, "OO!O", &it, &PyList_Type, &values, &next))
return NULL;
tdo = (teedataobject *)teedataobject_newinternal(it);
if (!tdo)
return NULL;
len = PyList_GET_SIZE(values);
if (len > LINKCELLS)
goto err;
for (i=0; i<len; i++) {
tdo->values[i] = PyList_GET_ITEM(values, i);
Py_INCREF(tdo->values[i]);
}
/* len <= LINKCELLS < INT_MAX */
tdo->numread = Py_SAFE_DOWNCAST(len, Py_ssize_t, int);
if (len == LINKCELLS) {
if (next != Py_None) {
if (Py_TYPE(next) != &teedataobject_type)
goto err;
assert(tdo->nextlink == NULL);
Py_INCREF(next);
tdo->nextlink = next;
}
} else {
if (next != Py_None)
goto err; /* shouldn't have a next if we are not full */
}
return (PyObject*)tdo;
err:
Py_XDECREF(tdo);
PyErr_SetString(PyExc_ValueError, "Invalid arguments");
return NULL;
}
static PyMethodDef teedataobject_methods[] = {
{"__reduce__", (PyCFunction)teedataobject_reduce, METH_NOARGS,
reduce_doc},
{NULL, NULL} /* sentinel */
};
PyDoc_STRVAR(teedataobject_doc, "Data container common to multiple tee objects.");
static PyTypeObject teedataobject_type = {
PyVarObject_HEAD_INIT(0, 0) /* Must fill in type value later */
"itertools._tee_dataobject", /* tp_name */
sizeof(teedataobject), /* tp_basicsize */
0, /* tp_itemsize */
/* methods */
(destructor)teedataobject_dealloc, /* tp_dealloc */
0, /* tp_print */
0, /* tp_getattr */
0, /* tp_setattr */
0, /* tp_reserved */
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 | Py_TPFLAGS_HAVE_GC, /* tp_flags */
teedataobject_doc, /* tp_doc */
(traverseproc)teedataobject_traverse, /* tp_traverse */
(inquiry)teedataobject_clear, /* tp_clear */
0, /* tp_richcompare */
0, /* tp_weaklistoffset */
0, /* tp_iter */
0, /* tp_iternext */
teedataobject_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 */
0, /* tp_alloc */
teedataobject_new, /* tp_new */
PyObject_GC_Del, /* tp_free */
};
static PyTypeObject tee_type;
static PyObject *
tee_next(teeobject *to)
{
PyObject *value, *link;
if (to->index >= LINKCELLS) {
link = teedataobject_jumplink(to->dataobj);
if (link == NULL)
return NULL;
Py_DECREF(to->dataobj);
to->dataobj = (teedataobject *)link;
to->index = 0;
}
value = teedataobject_getitem(to->dataobj, to->index);
if (value == NULL)
return NULL;
to->index++;
return value;
}
static int
tee_traverse(teeobject *to, visitproc visit, void *arg)
{
Py_VISIT((PyObject *)to->dataobj);
return 0;
}
static PyObject *
tee_copy(teeobject *to)
{
teeobject *newto;
newto = PyObject_GC_New(teeobject, &tee_type);
if (newto == NULL)
return NULL;
Py_INCREF(to->dataobj);
newto->dataobj = to->dataobj;
newto->index = to->index;
newto->weakreflist = NULL;
PyObject_GC_Track(newto);
return (PyObject *)newto;
}
PyDoc_STRVAR(teecopy_doc, "Returns an independent iterator.");
static PyObject *
tee_fromiterable(PyObject *iterable)
{
teeobject *to;
PyObject *it = NULL;
it = PyObject_GetIter(iterable);
if (it == NULL)
return NULL;
if (PyObject_TypeCheck(it, &tee_type)) {
to = (teeobject *)tee_copy((teeobject *)it);
goto done;
}
to = PyObject_GC_New(teeobject, &tee_type);
if (to == NULL)
goto done;
to->dataobj = (teedataobject *)teedataobject_newinternal(it);
if (!to->dataob
4D23
j) {
PyObject_GC_Del(to);
to = NULL;
goto done;
}
to->index = 0;
to->weakreflist = NULL;
PyObject_GC_Track(to);
done:
Py_XDECREF(it);
return (PyObject *)to;
}
static PyObject *
tee_new(PyTypeObject *type, PyObject *args, PyObject *kw)
{
PyObject *iterable;
if (!PyArg_UnpackTuple(args, "_tee", 1, 1, &iterable))
return NULL;
return tee_fromiterable(iterable);
}
static int
tee_clear(teeobject *to)
{
if (to->weakreflist != NULL)
PyObject_ClearWeakRefs((PyObject *) to);
Py_CLEAR(to->dataobj);
return 0;
}
static void
tee_dealloc(teeobject *to)
{
PyObject_GC_UnTrack(to);
tee_clear(to);
PyObject_GC_Del(to);
}
static PyObject *
tee_reduce(teeobject *to)
{
return Py_BuildValue("O(())(Oi)", Py_TYPE(to), to->dataobj, to->index);
}
static PyObject *
tee_setstate(teeobject *to, PyObject *state)
{
teedataobject *tdo;
int index;
if (!PyArg_ParseTuple(state, "O!i", &teedataobject_type, &tdo, &index))
return NULL;
if (index < 0 || index > LINKCELLS) {
PyErr_SetString(PyExc_ValueError, "Index out of range");
return NULL;
}
Py_CLEAR(to->dataobj);
to->dataobj = tdo;
Py_INCREF(to->dataobj);
to->index = index;
Py_RETURN_NONE;
}
PyDoc_STRVAR(teeobject_doc,
"Iterator wrapped to make it copyable");
static PyMethodDef tee_methods[] = {
{"__copy__", (PyCFunction)tee_copy, METH_NOARGS, teecopy_doc},
{"__reduce__", (PyCFunction)tee_reduce, METH_NOARGS, reduce_doc},
{"__setstate__", (PyCFunction)tee_setstate, METH_O, setstate_doc},
{NULL, NULL} /* sentinel */
};
static PyTypeObject tee_type = {
PyVarObject_HEAD_INIT(NULL, 0)
"itertools._tee", /* tp_name */
sizeof(teeobject), /* tp_basicsize */
0, /* tp_itemsize */
/* methods */
(destructor)tee_dealloc, /* tp_dealloc */
0, /* tp_print */
0, /* tp_getattr */
0, /* tp_setattr */
0, /* tp_reserved */
0, /* tp_repr */
0, /* tp_as_number */
0, /* tp_as_sequence */
0, /* tp_as_mapping */
0, /* tp_hash */
0, /* tp_call */
0, /* tp_str */
0, /* tp_getattro */
0, /* tp_setattro */
0, /* tp_as_buffer */
Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC, /* tp_flags */
teeobject_doc, /* tp_doc */
(traverseproc)tee_traverse, /* tp_traverse */
(inquiry)tee_clear, /* tp_clear */
0, /* tp_richcompare */
offsetof(teeobject, weakreflist), /* tp_weaklistoffset */
PyObject_SelfIter, /* tp_iter */
(iternextfunc)tee_next, /* tp_iternext */
tee_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 */
0, /* tp_alloc */
tee_new, /* tp_new */
PyObject_GC_Del, /* tp_free */
};
static PyObject *
tee(PyObject *self, PyObject *args)
{
Py_ssize_t i, n=2;
PyObject *it, *iterable, *copyable, *result;
_Py_IDENTIFIER(__copy__);
if (!PyArg_ParseTuple(args, "O|n", &iterable, &n))
return NULL;
if (n < 0) {
PyErr_SetString(PyExc_ValueError, "n must be >= 0");
return NULL;
}
result = PyTuple_New(n);
if (result == NULL)
return NULL;
if (n == 0)
return result;
it = PyObject_GetIter(iterable);
if (it == NULL) {
Py_DECREF(result);
return NULL;
}
if (!_PyObject_HasAttrId(it, &PyId___copy__)) {
copyable = tee_fromiterable(it);
Py_DECREF(it);
if (copyable == NULL) {
Py_DECREF(result);
return NULL;
}
} else
copyable = it;
PyTuple_SET_ITEM(result, 0, copyable);
for (i=1 ; i<n ; i++) {
copyable = _PyObject_CallMethodId(copyable, &PyId___copy__, NULL);
if (copyable == NULL) {
Py_DECREF(result);
return NULL;
}
PyTuple_SET_ITEM(result, i, copyable);
}
return result;
}
PyDoc_STRVAR(tee_doc,
"tee(iterable, n=2) --> tuple of n independent iterators.");
/* cycle object **********************************************************/
typedef struct {
PyObject_HEAD
PyObject *it;
PyObject *saved;
int firstpass;
} cycleobject;
static PyTypeObject cycle_type;
static PyObject *
cycle_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
{
PyObject *it;
PyObject *iterable;
PyObject *saved;
cycleobject *lz;
if (type == &cycle_type && !_PyArg_NoKeywords("cycle()", kwds))
return NULL;
if (!PyArg_UnpackTuple(args, "cycle", 1, 1, &iterable))
return NULL;
/* Get iterator. */
it = PyObject_GetIter(iterable);
if (it == NULL)
return NULL;
saved = PyList_New(0);
if (saved == NULL) {
Py_DECREF(it);
return NULL;
}
/* create cycleobject structure */
lz = (cycleobject *)type->tp_alloc(type, 0);
if (lz == NULL) {
Py_DECREF(it);
Py_DECREF(saved);
return NULL;
}
lz->it = it;
lz->saved = saved;
lz->firstpass = 0;
return (PyObject *)lz;
}
static void
cycle_dealloc(cycleobject *lz)
{
PyObject_GC_UnTrack(lz);
Py_XDECREF(lz->saved);
Py_XDECREF(lz->it);
Py_TYPE(lz)->tp_free(lz);
}
static int
cycle_traverse(cycleobject *lz, visitproc visit, void *arg)
{
Py_VISIT(lz->it);
Py_VISIT(lz->saved);
return 0;
}
static PyObject *
cycle_next(cycleobject *lz)
{
PyObject *item;
PyObject *it;
PyObject *tmp;
while (1) {
item = PyIter_Next(lz->it);
if (item != NULL) {
if (!lz->firstpass && PyList_Append(lz->saved, item)) {
Py_DECREF(item);
return NULL;
}
return item;
}
if (PyErr_Occurred()) {
if (PyErr_ExceptionMatches(PyExc_StopIteration))
PyErr_Clear();
else
return NULL;
}
if (PyList_Size(lz->saved) == 0)
return NULL;
it = PyObject_GetIter(lz->saved);
if (it == NULL)
return NULL;
tmp = lz->it;
lz->it = it;
lz->firstpass = 1;
Py_DECREF(tmp);
}
}
static PyObject *
cycle_reduce(cycleobject *lz)
{
/* Create a new cycle with the iterator tuple, then set
* the saved state on it.
*/
return Py_BuildValue("O(O)(Oi)", Py_TYPE(lz),
lz->it, lz->saved, lz->firstpass);
}
static PyObject *
cycle_setstate(cycleobject *lz, PyObject *state)
{
PyObject *saved=NULL;
int firstpass;
if (!PyArg_ParseTuple(state, "Oi", &saved, &firstpass))
return NULL;
Py_CLEAR(lz->saved);
lz->saved = saved;
Py_XINCREF(lz->saved);
lz->firstpass = firstpass != 0;
Py_RETURN_NONE;
}
static PyMethodDef cycle_methods[] = {
{"__reduce__", (PyCFunction)cycle_reduce, METH_NOARGS,
reduce_doc},
{"__setstate__", (PyCFunction)cycle_setstate, METH_O,
setstate_doc},
{NULL, NULL} /* sentinel */
};
PyDoc_STRVAR(cycle_doc,
"cycle(iterable) --> cycle object\n\
\n\
Return elements from the iterable until it is exhausted.\n\
Then repeat the sequence indefinitely.");
static PyTypeObject cycle_type = {
PyVarObject_HEAD_INIT(NULL, 0)
"itertools.cycle", /* tp_name */
sizeof(cycleobject), /* tp_basicsize */