mirror of https://github.com/python/cpython
481 lines
15 KiB
C
481 lines
15 KiB
C
/* enumerate object */
|
|
|
|
#include "Python.h"
|
|
#include "pycore_call.h" // _PyObject_CallNoArgs()
|
|
#include "pycore_long.h" // _PyLong_GetOne()
|
|
#include "pycore_object.h" // _PyObject_GC_TRACK()
|
|
|
|
#include "clinic/enumobject.c.h"
|
|
|
|
/*[clinic input]
|
|
class enumerate "enumobject *" "&PyEnum_Type"
|
|
class reversed "reversedobject *" "&PyReversed_Type"
|
|
[clinic start generated code]*/
|
|
/*[clinic end generated code: output=da39a3ee5e6b4b0d input=d2dfdf1a88c88975]*/
|
|
|
|
typedef struct {
|
|
PyObject_HEAD
|
|
Py_ssize_t en_index; /* current index of enumeration */
|
|
PyObject* en_sit; /* secondary iterator of enumeration */
|
|
PyObject* en_result; /* result tuple */
|
|
PyObject* en_longindex; /* index for sequences >= PY_SSIZE_T_MAX */
|
|
} enumobject;
|
|
|
|
|
|
/*[clinic input]
|
|
@classmethod
|
|
enumerate.__new__ as enum_new
|
|
|
|
iterable: object
|
|
an object supporting iteration
|
|
start: object = 0
|
|
|
|
Return an enumerate object.
|
|
|
|
The enumerate object yields pairs containing a count (from start, which
|
|
defaults to zero) and a value yielded by the iterable argument.
|
|
|
|
enumerate is useful for obtaining an indexed list:
|
|
(0, seq[0]), (1, seq[1]), (2, seq[2]), ...
|
|
[clinic start generated code]*/
|
|
|
|
static PyObject *
|
|
enum_new_impl(PyTypeObject *type, PyObject *iterable, PyObject *start)
|
|
/*[clinic end generated code: output=e95e6e439f812c10 input=782e4911efcb8acf]*/
|
|
{
|
|
enumobject *en;
|
|
|
|
en = (enumobject *)type->tp_alloc(type, 0);
|
|
if (en == NULL)
|
|
return NULL;
|
|
if (start != NULL) {
|
|
start = PyNumber_Index(start);
|
|
if (start == NULL) {
|
|
Py_DECREF(en);
|
|
return NULL;
|
|
}
|
|
assert(PyLong_Check(start));
|
|
en->en_index = PyLong_AsSsize_t(start);
|
|
if (en->en_index == -1 && PyErr_Occurred()) {
|
|
PyErr_Clear();
|
|
en->en_index = PY_SSIZE_T_MAX;
|
|
en->en_longindex = start;
|
|
} else {
|
|
en->en_longindex = NULL;
|
|
Py_DECREF(start);
|
|
}
|
|
} else {
|
|
en->en_index = 0;
|
|
en->en_longindex = NULL;
|
|
}
|
|
en->en_sit = PyObject_GetIter(iterable);
|
|
if (en->en_sit == NULL) {
|
|
Py_DECREF(en);
|
|
return NULL;
|
|
}
|
|
en->en_result = PyTuple_Pack(2, Py_None, Py_None);
|
|
if (en->en_result == NULL) {
|
|
Py_DECREF(en);
|
|
return NULL;
|
|
}
|
|
return (PyObject *)en;
|
|
}
|
|
|
|
static void
|
|
enum_dealloc(enumobject *en)
|
|
{
|
|
PyObject_GC_UnTrack(en);
|
|
Py_XDECREF(en->en_sit);
|
|
Py_XDECREF(en->en_result);
|
|
Py_XDECREF(en->en_longindex);
|
|
Py_TYPE(en)->tp_free(en);
|
|
}
|
|
|
|
static int
|
|
enum_traverse(enumobject *en, visitproc visit, void *arg)
|
|
{
|
|
Py_VISIT(en->en_sit);
|
|
Py_VISIT(en->en_result);
|
|
Py_VISIT(en->en_longindex);
|
|
return 0;
|
|
}
|
|
|
|
static PyObject *
|
|
enum_next_long(enumobject *en, PyObject* next_item)
|
|
{
|
|
PyObject *result = en->en_result;
|
|
PyObject *next_index;
|
|
PyObject *stepped_up;
|
|
PyObject *old_index;
|
|
PyObject *old_item;
|
|
|
|
if (en->en_longindex == NULL) {
|
|
en->en_longindex = PyLong_FromSsize_t(PY_SSIZE_T_MAX);
|
|
if (en->en_longindex == NULL) {
|
|
Py_DECREF(next_item);
|
|
return NULL;
|
|
}
|
|
}
|
|
next_index = en->en_longindex;
|
|
assert(next_index != NULL);
|
|
stepped_up = PyNumber_Add(next_index, _PyLong_GetOne());
|
|
if (stepped_up == NULL) {
|
|
Py_DECREF(next_item);
|
|
return NULL;
|
|
}
|
|
en->en_longindex = stepped_up;
|
|
|
|
if (Py_REFCNT(result) == 1) {
|
|
Py_INCREF(result);
|
|
old_index = PyTuple_GET_ITEM(result, 0);
|
|
old_item = PyTuple_GET_ITEM(result, 1);
|
|
PyTuple_SET_ITEM(result, 0, next_index);
|
|
PyTuple_SET_ITEM(result, 1, next_item);
|
|
Py_DECREF(old_index);
|
|
Py_DECREF(old_item);
|
|
// bpo-42536: The GC may have untracked this result tuple. Since we're
|
|
// recycling it, make sure it's tracked again:
|
|
if (!_PyObject_GC_IS_TRACKED(result)) {
|
|
_PyObject_GC_TRACK(result);
|
|
}
|
|
return result;
|
|
}
|
|
result = PyTuple_New(2);
|
|
if (result == NULL) {
|
|
Py_DECREF(next_index);
|
|
Py_DECREF(next_item);
|
|
return NULL;
|
|
}
|
|
PyTuple_SET_ITEM(result, 0, next_index);
|
|
PyTuple_SET_ITEM(result, 1, next_item);
|
|
return result;
|
|
}
|
|
|
|
static PyObject *
|
|
enum_next(enumobject *en)
|
|
{
|
|
PyObject *next_index;
|
|
PyObject *next_item;
|
|
PyObject *result = en->en_result;
|
|
PyObject *it = en->en_sit;
|
|
PyObject *old_index;
|
|
PyObject *old_item;
|
|
|
|
next_item = (*Py_TYPE(it)->tp_iternext)(it);
|
|
if (next_item == NULL)
|
|
return NULL;
|
|
|
|
if (en->en_index == PY_SSIZE_T_MAX)
|
|
return enum_next_long(en, next_item);
|
|
|
|
next_index = PyLong_FromSsize_t(en->en_index);
|
|
if (next_index == NULL) {
|
|
Py_DECREF(next_item);
|
|
return NULL;
|
|
}
|
|
en->en_index++;
|
|
|
|
if (Py_REFCNT(result) == 1) {
|
|
Py_INCREF(result);
|
|
old_index = PyTuple_GET_ITEM(result, 0);
|
|
old_item = PyTuple_GET_ITEM(result, 1);
|
|
PyTuple_SET_ITEM(result, 0, next_index);
|
|
PyTuple_SET_ITEM(result, 1, next_item);
|
|
Py_DECREF(old_index);
|
|
Py_DECREF(old_item);
|
|
// bpo-42536: The GC may have untracked this result tuple. Since we're
|
|
// recycling it, make sure it's tracked again:
|
|
if (!_PyObject_GC_IS_TRACKED(result)) {
|
|
_PyObject_GC_TRACK(result);
|
|
}
|
|
return result;
|
|
}
|
|
result = PyTuple_New(2);
|
|
if (result == NULL) {
|
|
Py_DECREF(next_index);
|
|
Py_DECREF(next_item);
|
|
return NULL;
|
|
}
|
|
PyTuple_SET_ITEM(result, 0, next_index);
|
|
PyTuple_SET_ITEM(result, 1, next_item);
|
|
return result;
|
|
}
|
|
|
|
static PyObject *
|
|
enum_reduce(enumobject *en, PyObject *Py_UNUSED(ignored))
|
|
{
|
|
if (en->en_longindex != NULL)
|
|
return Py_BuildValue("O(OO)", Py_TYPE(en), en->en_sit, en->en_longindex);
|
|
else
|
|
return Py_BuildValue("O(On)", Py_TYPE(en), en->en_sit, en->en_index);
|
|
}
|
|
|
|
PyDoc_STRVAR(reduce_doc, "Return state information for pickling.");
|
|
|
|
static PyMethodDef enum_methods[] = {
|
|
{"__reduce__", (PyCFunction)enum_reduce, METH_NOARGS, reduce_doc},
|
|
{"__class_getitem__", Py_GenericAlias,
|
|
METH_O|METH_CLASS, PyDoc_STR("See PEP 585")},
|
|
{NULL, NULL} /* sentinel */
|
|
};
|
|
|
|
PyTypeObject PyEnum_Type = {
|
|
PyVarObject_HEAD_INIT(&PyType_Type, 0)
|
|
"enumerate", /* tp_name */
|
|
sizeof(enumobject), /* tp_basicsize */
|
|
0, /* tp_itemsize */
|
|
/* methods */
|
|
(destructor)enum_dealloc, /* tp_dealloc */
|
|
0, /* tp_vectorcall_offset */
|
|
0, /* tp_getattr */
|
|
0, /* tp_setattr */
|
|
0, /* tp_as_async */
|
|
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 */
|
|
enum_new__doc__, /* tp_doc */
|
|
(traverseproc)enum_traverse, /* tp_traverse */
|
|
0, /* tp_clear */
|
|
0, /* tp_richcompare */
|
|
0, /* tp_weaklistoffset */
|
|
PyObject_SelfIter, /* tp_iter */
|
|
(iternextfunc)enum_next, /* tp_iternext */
|
|
enum_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 */
|
|
enum_new, /* tp_new */
|
|
PyObject_GC_Del, /* tp_free */
|
|
};
|
|
|
|
/* Reversed Object ***************************************************************/
|
|
|
|
typedef struct {
|
|
PyObject_HEAD
|
|
Py_ssize_t index;
|
|
PyObject* seq;
|
|
} reversedobject;
|
|
|
|
/*[clinic input]
|
|
@classmethod
|
|
reversed.__new__ as reversed_new
|
|
|
|
sequence as seq: object
|
|
/
|
|
|
|
Return a reverse iterator over the values of the given sequence.
|
|
[clinic start generated code]*/
|
|
|
|
static PyObject *
|
|
reversed_new_impl(PyTypeObject *type, PyObject *seq)
|
|
/*[clinic end generated code: output=f7854cc1df26f570 input=aeb720361e5e3f1d]*/
|
|
{
|
|
Py_ssize_t n;
|
|
PyObject *reversed_meth;
|
|
reversedobject *ro;
|
|
_Py_IDENTIFIER(__reversed__);
|
|
|
|
reversed_meth = _PyObject_LookupSpecial(seq, &PyId___reversed__);
|
|
if (reversed_meth == Py_None) {
|
|
Py_DECREF(reversed_meth);
|
|
PyErr_Format(PyExc_TypeError,
|
|
"'%.200s' object is not reversible",
|
|
Py_TYPE(seq)->tp_name);
|
|
return NULL;
|
|
}
|
|
if (reversed_meth != NULL) {
|
|
PyObject *res = _PyObject_CallNoArgs(reversed_meth);
|
|
Py_DECREF(reversed_meth);
|
|
return res;
|
|
}
|
|
else if (PyErr_Occurred())
|
|
return NULL;
|
|
|
|
if (!PySequence_Check(seq)) {
|
|
PyErr_Format(PyExc_TypeError,
|
|
"'%.200s' object is not reversible",
|
|
Py_TYPE(seq)->tp_name);
|
|
return NULL;
|
|
}
|
|
|
|
n = PySequence_Size(seq);
|
|
if (n == -1)
|
|
return NULL;
|
|
|
|
ro = (reversedobject *)type->tp_alloc(type, 0);
|
|
if (ro == NULL)
|
|
return NULL;
|
|
|
|
ro->index = n-1;
|
|
Py_INCREF(seq);
|
|
ro->seq = seq;
|
|
return (PyObject *)ro;
|
|
}
|
|
|
|
static PyObject *
|
|
reversed_vectorcall(PyObject *type, PyObject * const*args,
|
|
size_t nargsf, PyObject *kwnames)
|
|
{
|
|
assert(PyType_Check(type));
|
|
|
|
if (!_PyArg_NoKwnames("reversed", kwnames)) {
|
|
return NULL;
|
|
}
|
|
|
|
Py_ssize_t nargs = PyVectorcall_NARGS(nargsf);
|
|
if (!_PyArg_CheckPositional("reversed", nargs, 1, 1)) {
|
|
return NULL;
|
|
}
|
|
|
|
return reversed_new_impl((PyTypeObject *)type, args[0]);
|
|
}
|
|
|
|
static void
|
|
reversed_dealloc(reversedobject *ro)
|
|
{
|
|
PyObject_GC_UnTrack(ro);
|
|
Py_XDECREF(ro->seq);
|
|
Py_TYPE(ro)->tp_free(ro);
|
|
}
|
|
|
|
static int
|
|
reversed_traverse(reversedobject *ro, visitproc visit, void *arg)
|
|
{
|
|
Py_VISIT(ro->seq);
|
|
return 0;
|
|
}
|
|
|
|
static PyObject *
|
|
reversed_next(reversedobject *ro)
|
|
{
|
|
PyObject *item;
|
|
Py_ssize_t index = ro->index;
|
|
|
|
if (index >= 0) {
|
|
item = PySequence_GetItem(ro->seq, index);
|
|
if (item != NULL) {
|
|
ro->index--;
|
|
return item;
|
|
}
|
|
if (PyErr_ExceptionMatches(PyExc_IndexError) ||
|
|
PyErr_ExceptionMatches(PyExc_StopIteration))
|
|
PyErr_Clear();
|
|
}
|
|
ro->index = -1;
|
|
Py_CLEAR(ro->seq);
|
|
return NULL;
|
|
}
|
|
|
|
static PyObject *
|
|
reversed_len(reversedobject *ro, PyObject *Py_UNUSED(ignored))
|
|
{
|
|
Py_ssize_t position, seqsize;
|
|
|
|
if (ro->seq == NULL)
|
|
return PyLong_FromLong(0);
|
|
seqsize = PySequence_Size(ro->seq);
|
|
if (seqsize == -1)
|
|
return NULL;
|
|
position = ro->index + 1;
|
|
return PyLong_FromSsize_t((seqsize < position) ? 0 : position);
|
|
}
|
|
|
|
PyDoc_STRVAR(length_hint_doc, "Private method returning an estimate of len(list(it)).");
|
|
|
|
static PyObject *
|
|
reversed_reduce(reversedobject *ro, PyObject *Py_UNUSED(ignored))
|
|
{
|
|
if (ro->seq)
|
|
return Py_BuildValue("O(O)n", Py_TYPE(ro), ro->seq, ro->index);
|
|
else
|
|
return Py_BuildValue("O(())", Py_TYPE(ro));
|
|
}
|
|
|
|
static PyObject *
|
|
reversed_setstate(reversedobject *ro, PyObject *state)
|
|
{
|
|
Py_ssize_t index = PyLong_AsSsize_t(state);
|
|
if (index == -1 && PyErr_Occurred())
|
|
return NULL;
|
|
if (ro->seq != 0) {
|
|
Py_ssize_t n = PySequence_Size(ro->seq);
|
|
if (n < 0)
|
|
return NULL;
|
|
if (index < -1)
|
|
index = -1;
|
|
else if (index > n-1)
|
|
index = n-1;
|
|
ro->index = index;
|
|
}
|
|
Py_RETURN_NONE;
|
|
}
|
|
|
|
PyDoc_STRVAR(setstate_doc, "Set state information for unpickling.");
|
|
|
|
static PyMethodDef reversediter_methods[] = {
|
|
{"__length_hint__", (PyCFunction)reversed_len, METH_NOARGS, length_hint_doc},
|
|
{"__reduce__", (PyCFunction)reversed_reduce, METH_NOARGS, reduce_doc},
|
|
{"__setstate__", (PyCFunction)reversed_setstate, METH_O, setstate_doc},
|
|
{NULL, NULL} /* sentinel */
|
|
};
|
|
|
|
PyTypeObject PyReversed_Type = {
|
|
PyVarObject_HEAD_INIT(&PyType_Type, 0)
|
|
"reversed", /* tp_name */
|
|
sizeof(reversedobject), /* tp_basicsize */
|
|
0, /* tp_itemsize */
|
|
/* methods */
|
|
(destructor)reversed_dealloc, /* tp_dealloc */
|
|
0, /* tp_vectorcall_offset */
|
|
0, /* tp_getattr */
|
|
0, /* tp_setattr */
|
|
0, /* tp_as_async */
|
|
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 */
|
|
reversed_new__doc__, /* tp_doc */
|
|
(traverseproc)reversed_traverse,/* tp_traverse */
|
|
0, /* tp_clear */
|
|
0, /* tp_richcompare */
|
|
0, /* tp_weaklistoffset */
|
|
PyObject_SelfIter, /* tp_iter */
|
|
(iternextfunc)reversed_next, /* tp_iternext */
|
|
reversediter_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 */
|
|
reversed_new, /* tp_new */
|
|
PyObject_GC_Del, /* tp_free */
|
|
.tp_vectorcall = (vectorcallfunc)reversed_vectorcall,
|
|
};
|