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Checking in the code for PEP 357. 

This was mostly written by Travis Oliphant.
I've inspected it all; Neal Norwitz and MvL have also looked at it
(in an earlier incarnation).
This commit is contained in:
Guido van Rossum 2006-03-07 18:50:55 +00:00
parent 9d7855076a
commit 38fff8c4e4
19 changed files with 269 additions and 150 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
Doc/api/abstract.tex
View File

@ -346,6 +346,7 @@ determination.
either the sequence and mapping protocols, the sequence length is
returned. On error, \code{-1} is returned. This is the equivalent
to the Python expression \samp{len(\var{o})}.\bifuncindex{len}
\versionadded{2.5}
\end{cfuncdesc}
@ -689,6 +690,10 @@ determination.
\samp{float(\var{o})}.\bifuncindex{float}
\end{cfuncdesc}
\begin{cfuncdesc}{Py_ssize_t}{PyNumber_Index}{PyObject *o}
Returns the \var{o} converted to a Py_ssize_t integer on success, or
-1 with an exception raised on failure.
\end{cfuncdesc}
\section{Sequence Protocol \label{sequence}}

5
Doc/lib/liboperator.tex
View File

@ -171,6 +171,11 @@ effect. This is also known as ``true'' division.
Return the bitwise exclusive or of \var{a} and \var{b}.
\end{funcdesc}
\begin{funcdesc}{index}{a}
\funcline{__index__}{a}
Return \var{a} converted to an integer. Equivalent to \var{a}\code{.__index__()}.
\versionadded{2.5}
\end{funcdesc}
Operations which work with sequences include:

7
Doc/ref/ref3.tex
View File

@ -1978,6 +1978,13 @@ Called to implement the built-in functions
\function{hex()}\bifuncindex{hex}. Should return a string value.
\end{methoddesc}
\begin{methoddesc}[numeric object]{__index__}{self}
Called to implement operator.index(). Also called whenever Python
needs an integer object (such as in slicing). Must return an integer
(int or long).
\versionadded{2.5}
\end{methoddesc}
\begin{methoddesc}[numeric object]{__coerce__}{self, other}
Called to implement ``mixed-mode'' numeric arithmetic. Should either
return a 2-tuple containing \var{self} and \var{other} converted to

8
Include/abstract.h
View File

@ -748,6 +748,14 @@ xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx*/
*/
PyAPI_FUNC(Py_ssize_t) PyNumber_Index(PyObject *);
/*
Returns the object converted to Py_ssize_t on success
or -1 with an error raised on failure.
*/
PyAPI_FUNC(PyObject *) PyNumber_Int(PyObject *o);
/*

9
Include/object.h
View File

@ -206,6 +206,9 @@ typedef struct {
binaryfunc nb_true_divide;
binaryfunc nb_inplace_floor_divide;
binaryfunc nb_inplace_true_divide;
/* Added in release 2.5 */
lenfunc nb_index;
} PyNumberMethods;
typedef struct {
@ -503,13 +506,16 @@ given type object has a specified feature.
/* Objects support garbage collection (see objimp.h) */
#define Py_TPFLAGS_HAVE_GC (1L<<14)
/* These two bits are preserved for Stackless Python, next after this is 16 */
/* These two bits are preserved for Stackless Python, next after this is 17 */
#ifdef STACKLESS
#define Py_TPFLAGS_HAVE_STACKLESS_EXTENSION (3L<<15)
#else
#define Py_TPFLAGS_HAVE_STACKLESS_EXTENSION 0
#endif
/* Objects support nb_index in PyNumberMethods */
#define Py_TPFLAGS_HAVE_INDEX (1L<<17)
#define Py_TPFLAGS_DEFAULT ( \
Py_TPFLAGS_HAVE_GETCHARBUFFER | \
Py_TPFLAGS_HAVE_SEQUENCE_IN | \
@ -519,6 +525,7 @@ given type object has a specified feature.
Py_TPFLAGS_HAVE_ITER | \
Py_TPFLAGS_HAVE_CLASS | \
Py_TPFLAGS_HAVE_STACKLESS_EXTENSION | \
Py_TPFLAGS_HAVE_INDEX | \
0)
#define PyType_HasFeature(t,f) (((t)->tp_flags & (f)) != 0)

0
Lib/test/test_index.py Normal file
View File

29
Modules/arraymodule.c
View File

@ -1569,19 +1569,17 @@ array_repr(arrayobject *a)
return s;
}
#define HASINDEX(o) PyType_HasFeature((o)->ob_type, Py_TPFLAGS_HAVE_INDEX)
static PyObject*
array_subscr(arrayobject* self, PyObject* item)
{
if (PyInt_Check(item)) {
Py_ssize_t i = PyInt_AS_LONG(item);
if (i < 0)
i += self->ob_size;
return array_item(self, i);
}
else if (PyLong_Check(item)) {
Py_ssize_t i = PyInt_AsSsize_t(item);
if (i == -1 && PyErr_Occurred())
PyNumberMethods *nb = item->ob_type->tp_as_number;
if (nb != NULL && HASINDEX(item) && nb->nb_index != NULL) {
Py_ssize_t i = nb->nb_index(item);
if (i==-1 && PyErr_Occurred()) {
return NULL;
}
if (i < 0)
i += self->ob_size;
return array_item(self, i);
@ -1626,15 +1624,10 @@ array_subscr(arrayobject* self, PyObject* item)
static int
array_ass_subscr(arrayobject* self, PyObject* item, PyObject* value)
{
if (PyInt_Check(item)) {
Py_ssize_t i = PyInt_AS_LONG(item);
if (i < 0)
i += self->ob_size;
return array_ass_item(self, i, value);
}
else if (PyLong_Check(item)) {
Py_ssize_t i = PyInt_AsSsize_t(item);
if (i == -1 && PyErr_Occurred())
PyNumberMethods *nb = item->ob_type->tp_as_number;
if (nb != NULL && HASINDEX(item) && nb->nb_index != NULL) {
Py_ssize_t i = nb->nb_index(item);
if (i==-1 && PyErr_Occurred())
return -1;
if (i < 0)
i += self->ob_size;

25
Modules/mmapmodule.c
View File

@ -815,6 +815,8 @@ static PyTypeObject mmap_object_type = {
};
#define HASINDEX(o) PyType_HasFeature((o)->ob_type, Py_TPFLAGS_HAVE_INDEX)
/* extract the map size from the given PyObject
Returns -1 on error, with an appropriate Python exception raised. On
@ -822,26 +824,15 @@ static PyTypeObject mmap_object_type = {
static Py_ssize_t
_GetMapSize(PyObject *o)
{
if (PyInt_Check(o)) {
long i = PyInt_AsLong(o);
if (PyErr_Occurred())
PyNumberMethods *nb = o->ob_type->tp_as_number;
if (nb != NULL && HASINDEX(o) && nb->nb_index != NULL) {
Py_ssize_t i = nb->nb_index(o);
if (i==-1 && PyErr_Occurred())
return -1;
if (i < 0)
goto onnegoverflow;
return i;
}
else if (PyLong_Check(o)) {
Py_ssize_t i = PyInt_AsSsize_t(o);
if (PyErr_Occurred()) {
/* yes negative overflow is mistaken for positive overflow
but not worth the trouble to check sign of 'i' */
if (PyErr_ExceptionMatches(PyExc_OverflowError))
goto onposoverflow;
else
return -1;
}
if (i < 0)
goto onnegoverflow;
if (i==PY_SSIZE_T_MAX)
goto onposoverflow;
return i;
}
else {

15
Modules/operator.c
View File

@ -130,6 +130,20 @@ op_ipow(PyObject *s, PyObject *a)
return NULL;
}
static PyObject *
op_index(PyObject *s, PyObject *a)
{
Py_ssize_t i;
PyObject *a1;
if (!PyArg_UnpackTuple(a,"index", 1, 1, &a1))
return NULL;
i = PyNumber_Index(a1);
if (i == -1 && PyErr_Occurred())
return NULL;
else
return PyInt_FromSsize_t(i);
}
static PyObject*
is_(PyObject *s, PyObject *a)
{
@ -229,6 +243,7 @@ spam1o(isMappingType,
spam1(is_, "is_(a, b) -- Same as a is b.")
spam1(is_not, "is_not(a, b) -- Same as a is not b.")
spam2(index, __index__, "index(a) -- Same as a.__index__()")
spam2(add,__add__, "add(a, b) -- Same as a + b.")
spam2(sub,__sub__, "sub(a, b) -- Same as a - b.")
spam2(mul,__mul__, "mul(a, b) -- Same as a * b.")

76
Objects/abstract.c
View File

@ -8,6 +8,8 @@
#define NEW_STYLE_NUMBER(o) PyType_HasFeature((o)->ob_type, \
Py_TPFLAGS_CHECKTYPES)
#define HASINDEX(o) PyType_HasFeature((o)->ob_type, Py_TPFLAGS_HAVE_INDEX)
/* Shorthands to return certain errors */
static PyObject *
@ -119,10 +121,9 @@ PyObject_GetItem(PyObject *o, PyObject *key)
return m->mp_subscript(o, key);
if (o->ob_type->tp_as_sequence) {
if (PyInt_Check(key))
return PySequence_GetItem(o, PyInt_AsLong(key));
else if (PyLong_Check(key)) {
long key_value = PyLong_AsLong(key);
PyNumberMethods *nb = key->ob_type->tp_as_number;
if (nb != NULL && HASINDEX(key) && nb->nb_index != NULL) {
Py_ssize_t key_value = nb->nb_index(key);
if (key_value == -1 && PyErr_Occurred())
return NULL;
return PySequence_GetItem(o, key_value);
@ -148,10 +149,9 @@ PyObject_SetItem(PyObject *o, PyObject *key, PyObject *value)
return m->mp_ass_subscript(o, key, value);
if (o->ob_type->tp_as_sequence) {
if (PyInt_Check(key))
return PySequence_SetItem(o, PyInt_AsLong(key), value);
else if (PyLong_Check(key)) {
long key_value = PyLong_AsLong(key);
PyNumberMethods *nb = key->ob_type->tp_as_number;
if (nb != NULL && HASINDEX(key) && nb->nb_index != NULL) {
Py_ssize_t key_value = nb->nb_index(key);
if (key_value == -1 && PyErr_Occurred())
return -1;
return PySequence_SetItem(o, key_value, value);
@ -180,10 +180,9 @@ PyObject_DelItem(PyObject *o, PyObject *key)
return m->mp_ass_subscript(o, key, (PyObject*)NULL);
if (o->ob_type->tp_as_sequence) {
if (PyInt_Check(key))
return PySequence_DelItem(o, PyInt_AsLong(key));
else if (PyLong_Check(key)) {
long key_value = PyLong_AsLong(key);
PyNumberMethods *nb = key->ob_type->tp_as_number;
if (nb != NULL && HASINDEX(key) && nb->nb_index != NULL) {
Py_ssize_t key_value = nb->nb_index(key);
if (key_value == -1 && PyErr_Occurred())
return -1;
return PySequence_DelItem(o, key_value);
@ -647,12 +646,10 @@ PyNumber_Add(PyObject *v, PyObject *w)
static PyObject *
sequence_repeat(ssizeargfunc repeatfunc, PyObject *seq, PyObject *n)
{
long count;
if (PyInt_Check(n)) {
count = PyInt_AsLong(n);
}
else if (PyLong_Check(n)) {
count = PyLong_AsLong(n);
Py_ssize_t count;
PyNumberMethods *nb = n->ob_type->tp_as_number;
if (nb != NULL && HASINDEX(n) && nb->nb_index != NULL) {
count = nb->nb_index(n);
if (count == -1 && PyErr_Occurred())
return NULL;
}
@ -660,32 +657,7 @@ sequence_repeat(ssizeargfunc repeatfunc, PyObject *seq, PyObject *n)
return type_error(
"can't multiply sequence by non-int");
}
#if LONG_MAX != INT_MAX
if (count > INT_MAX) {
PyErr_SetString(PyExc_ValueError,
"sequence repeat count too large");
return NULL;
}
else if (count < INT_MIN)
count = INT_MIN;
/* XXX Why don't I either
- set count to -1 whenever it's negative (after all,
sequence repeat usually treats negative numbers
as zero(); or
- raise an exception when it's less than INT_MIN?
I'm thinking about a hypothetical use case where some
sequence type might use a negative value as a flag of
some kind. In those cases I don't want to break the
code by mapping all negative values to -1. But I also
don't want to break e.g. []*(-sys.maxint), which is
perfectly safe, returning []. As a compromise, I do
map out-of-range negative values.
*/
#endif
return (*repeatfunc)(seq, (int)count);
return (*repeatfunc)(seq, count);
}
PyObject *
@ -960,6 +932,22 @@ int_from_string(const char *s, Py_ssize_t len)
return x;
}
/* Return a Py_ssize_t integer from the object item */
Py_ssize_t
PyNumber_Index(PyObject *item)
{
Py_ssize_t value = -1;
PyNumberMethods *nb = item->ob_type->tp_as_number;
if (nb != NULL && HASINDEX(item) && nb->nb_index != NULL) {
value = nb->nb_index(item);
}
else {
PyErr_SetString(PyExc_IndexError,
"object cannot be interpreted as an index");
}
return value;
}
PyObject *
PyNumber_Int(PyObject *o)
{

38
Objects/classobject.c
View File

@ -1733,6 +1733,43 @@ instance_nonzero(PyInstanceObject *self)
return outcome > 0;
}
static Py_ssize_t
instance_index(PyInstanceObject *self)
{
PyObject *func, *res;
Py_ssize_t outcome;
static PyObject *indexstr = NULL;
if (indexstr == NULL) {
indexstr = PyString_InternFromString("__index__");
if (indexstr == NULL)
return -1;
}
if ((func = instance_getattr(self, indexstr)) == NULL) {
if (!PyErr_ExceptionMatches(PyExc_AttributeError))
return -1;
PyErr_Clear();
PyErr_SetString(PyExc_TypeError,
"object cannot be interpreted as an index");
return -1;
}
res = PyEval_CallObject(func, (PyObject *)NULL);
Py_DECREF(func);
if (res == NULL)
return -1;
if (PyInt_Check(res) || PyLong_Check(res)) {
outcome = res->ob_type->tp_as_number->nb_index(res);
}
else {
PyErr_SetString(PyExc_TypeError,
"__index__ must return an int or a long");
outcome = -1;
}
Py_DECREF(res);
return outcome;
}
UNARY(instance_invert, "__invert__")
UNARY(instance_int, "__int__")
UNARY(instance_long, "__long__")
@ -2052,6 +2089,7 @@ static PyNumberMethods instance_as_number = {
(binaryfunc)instance_truediv, /* nb_true_divide */
(binaryfunc)instance_ifloordiv, /* nb_inplace_floor_divide */
(binaryfunc)instance_itruediv, /* nb_inplace_true_divide */
(lenfunc)instance_index, /* nb_index */
};
PyTypeObject PyInstance_Type = {

1
Objects/intobject.c
View File

@ -1069,6 +1069,7 @@ static PyNumberMethods int_as_number = {
int_true_divide, /* nb_true_divide */
0, /* nb_inplace_floor_divide */
0, /* nb_inplace_true_divide */
(lenfunc)PyInt_AsSsize_t, /* nb_index */
};
PyTypeObject PyInt_Type = {

18
Objects/listobject.c
View File

@ -2452,11 +2452,14 @@ PyDoc_STRVAR(list_doc,
"list() -> new list\n"
"list(sequence) -> new list initialized from sequence's items");
#define HASINDEX(o) PyType_HasFeature((o)->ob_type, Py_TPFLAGS_HAVE_INDEX)
static PyObject *
list_subscript(PyListObject* self, PyObject* item)
{
if (PyInt_Check(item) || PyLong_Check(item)) {
Py_ssize_t i = PyInt_AsSsize_t(item);
PyNumberMethods *nb = item->ob_type->tp_as_number;
if (nb != NULL && HASINDEX(item) && nb->nb_index != NULL) {
Py_ssize_t i = nb->nb_index(item);
if (i == -1 && PyErr_Occurred())
return NULL;
if (i < 0)
@ -2503,14 +2506,9 @@ list_subscript(PyListObject* self, PyObject* item)
static int
list_ass_subscript(PyListObject* self, PyObject* item, PyObject* value)
{
if (PyInt_Check(item)) {
Py_ssize_t i = PyInt_AS_LONG(item);
if (i < 0)
i += PyList_GET_SIZE(self);
return list_ass_item(self, i, value);
}
else if (PyLong_Check(item)) {
Py_ssize_t i = PyInt_AsSsize_t(item);
PyNumberMethods *nb = item->ob_type->tp_as_number;
if (nb != NULL && HASINDEX(item) && nb->nb_index != NULL) {
Py_ssize_t i = nb->nb_index(item);
if (i == -1 && PyErr_Occurred())
return -1;
if (i < 0)

49
Objects/longobject.c
View File

@ -241,12 +241,8 @@ PyLong_AsLong(PyObject *vv)
return -1;
}
/* Get a Py_ssize_t from a long int object.
Returns -1 and sets an error condition if overflow occurs. */
Py_ssize_t
_PyLong_AsSsize_t(PyObject *vv)
{
static Py_ssize_t
_long_as_ssize_t(PyObject *vv) {
register PyLongObject *v;
size_t x, prev;
Py_ssize_t i;
@ -282,7 +278,45 @@ _PyLong_AsSsize_t(PyObject *vv)
overflow:
PyErr_SetString(PyExc_OverflowError,
"long int too large to convert to int");
return -1;
if (sign > 0)
return PY_SSIZE_T_MAX;
else
return -PY_SSIZE_T_MAX-1;
}
/* Get a Py_ssize_t from a long int object.
Returns -1 and sets an error condition if overflow occurs. */
Py_ssize_t
_PyLong_AsSsize_t(PyObject *vv)
{
Py_ssize_t x;
x = _long_as_ssize_t(vv);
if (PyErr_Occurred()) return -1;
return x;
}
/* Get a Py_ssize_t from a long int object.
Silently reduce values larger than PY_SSIZE_T_MAX to PY_SSIZE_T_MAX,
and silently boost values less than -PY_SSIZE_T_MAX-1 to -PY_SSIZE_T_MAX-1.
Return 0 on error, 1 on success.
*/
static Py_ssize_t
long_index(PyObject *vv)
{
Py_ssize_t x;
x = _long_as_ssize_t(vv);
if (PyErr_Occurred()) {
/* If overflow error, ignore the error */
if (x != -1) {
PyErr_Clear();
}
}
return x;
}
/* Get a C unsigned long int from a long int object.
@ -3131,6 +3165,7 @@ static PyNumberMethods long_as_number = {
long_true_divide, /* nb_true_divide */
0, /* nb_inplace_floor_divide */
0, /* nb_inplace_true_divide */
(lenfunc)long_index, /* nb_index */
};
PyTypeObject PyLong_Type = {

9
Objects/stringobject.c
View File

@ -1187,16 +1187,19 @@ string_hash(PyStringObject *a)
return x;
}
#define HASINDEX(o) PyType_HasFeature((o)->ob_type, Py_TPFLAGS_HAVE_INDEX)
static PyObject*
string_subscript(PyStringObject* self, PyObject* item)
{
if (PyInt_Check(item) || PyLong_Check(item)) {
Py_ssize_t i = PyInt_AsSsize_t(item);
PyNumberMethods *nb = item->ob_type->tp_as_number;
if (nb != NULL && HASINDEX(item) && nb->nb_index != NULL) {
Py_ssize_t i = nb->nb_index(item);
if (i == -1 && PyErr_Occurred())
return NULL;
if (i < 0)
i += PyString_GET_SIZE(self);
return string_item(self,i);
return string_item(self, i);
}
else if (PySlice_Check(item)) {
Py_ssize_t start, stop, step, slicelength, cur, i;

7
Objects/tupleobject.c
View File

@ -584,11 +584,14 @@ static PySequenceMethods tuple_as_sequence = {
(objobjproc)tuplecontains, /* sq_contains */
};
#define HASINDEX(o) PyType_HasFeature((o)->ob_type, Py_TPFLAGS_HAVE_INDEX)
static PyObject*
tuplesubscript(PyTupleObject* self, PyObject* item)
{
if (PyInt_Check(item) || PyLong_Check(item)) {
Py_ssize_t i = PyInt_AsSsize_t(item);
PyNumberMethods *nb = item->ob_type->tp_as_number;
if (nb != NULL && HASINDEX(item) && nb->nb_index != NULL) {
Py_ssize_t i = nb->nb_index(item);
if (i == -1 && PyErr_Occurred())
return NULL;
if (i < 0)

43
Objects/typeobject.c
View File

@ -3051,6 +3051,9 @@ inherit_slots(PyTypeObject *type, PyTypeObject *base)
COPYNUM(nb_inplace_true_divide);
COPYNUM(nb_inplace_floor_divide);
}
if (base->tp_flags & Py_TPFLAGS_HAVE_INDEX) {
COPYNUM(nb_index);
}
}
if (type->tp_as_sequence != NULL && base->tp_as_sequence != NULL) {
@ -4344,6 +4347,44 @@ slot_nb_nonzero(PyObject *self)
return result;
}
static Py_ssize_t
slot_nb_index(PyObject *self)
{
PyObject *func, *args;
static PyObject *index_str;
Py_ssize_t result = -1;
func = lookup_maybe(self, "__index__", &index_str);
if (func == NULL) {
if (!PyErr_Occurred()) {
PyErr_SetString(PyExc_TypeError,
"object cannot be interpreted as an index");
}
return -1;
}
args = PyTuple_New(0);
if (args != NULL) {
PyObject *temp = PyObject_Call(func, args, NULL);
Py_DECREF(args);
if (temp != NULL) {
if (PyInt_Check(temp) || PyLong_Check(temp)) {
result =
temp->ob_type->tp_as_number->nb_index(temp);
}
else {
PyErr_SetString(PyExc_TypeError,
"__index__ must return an int or a long");
result = -1;
}
Py_DECREF(temp);
}
}
Py_DECREF(func);
return result;
}
SLOT0(slot_nb_invert, "__invert__")
SLOT1BIN(slot_nb_lshift, nb_lshift, "__lshift__", "__rlshift__")
SLOT1BIN(slot_nb_rshift, nb_rshift, "__rshift__", "__rrshift__")
@ -5069,6 +5110,8 @@ static slotdef slotdefs[] = {
"oct(x)"),
UNSLOT("__hex__", nb_hex, slot_nb_hex, wrap_unaryfunc,
"hex(x)"),
NBSLOT("__index__", nb_index, slot_nb_index, wrap_lenfunc,
"x[y:z] <==> x[y.__index__():z.__index__()]"),
IBSLOT("__iadd__", nb_inplace_add, slot_nb_inplace_add,
wrap_binaryfunc, "+"),
IBSLOT("__isub__", nb_inplace_subtract, slot_nb_inplace_subtract,

7
Objects/unicodeobject.c
View File

@ -6460,11 +6460,14 @@ static PySequenceMethods unicode_as_sequence = {
(objobjproc)PyUnicode_Contains, /*sq_contains*/
};
#define HASINDEX(o) PyType_HasFeature((o)->ob_type, Py_TPFLAGS_HAVE_INDEX)
static PyObject*
unicode_subscript(PyUnicodeObject* self, PyObject* item)
{
if (PyInt_Check(item) || PyLong_Check(item)) {
Py_ssize_t i = PyInt_AsSsize_t(item);
PyNumberMethods *nb = item->ob_type->tp_as_number;
if (nb != NULL && HASINDEX(item) && nb->nb_index != NULL) {
Py_ssize_t i = nb->nb_index(item);
if (i == -1 && PyErr_Occurred())
return NULL;
if (i < 0)

66
Python/ceval.c
View File

@ -3916,9 +3916,10 @@ ext_do_call(PyObject *func, PyObject ***pp_stack, int flags, int na, int nk)
return result;
}
/* Extract a slice index from a PyInt or PyLong, and store in *pi.
/* Extract a slice index from a PyInt or PyLong or an object with the
nb_index slot defined, and store in *pi.
Silently reduce values larger than PY_SSIZE_T_MAX to PY_SSIZE_T_MAX,
and silently boost values less than -PY_SSIZE_T_MAX to 0.
and silently boost values less than -PY_SSIZE_T_MAX-1 to -PY_SSIZE_T_MAX-1.
Return 0 on error, 1 on success.
*/
/* Note: If v is NULL, return success without storing into *pi. This
@ -3932,46 +3933,18 @@ _PyEval_SliceIndex(PyObject *v, Py_ssize_t *pi)
Py_ssize_t x;
if (PyInt_Check(v)) {
x = PyInt_AsLong(v);
} else if (PyLong_Check(v)) {
x = PyInt_AsSsize_t(v);
if (x==-1 && PyErr_Occurred()) {
PyObject *long_zero;
int cmp;
if (!PyErr_ExceptionMatches(
PyExc_OverflowError)) {
/* It's not an overflow error, so just
signal an error */
return 0;
}
/* Clear the OverflowError */
PyErr_Clear();
/* It's an overflow error, so we need to
check the sign of the long integer,
set the value to PY_SSIZE_T_MAX or
-PY_SSIZE_T_MAX, and clear the error. */
/* Create a long integer with a value of 0 */
long_zero = PyLong_FromLong(0L);
if (long_zero == NULL)
return 0;
/* Check sign */
cmp = PyObject_RichCompareBool(v, long_zero,
Py_GT);
Py_DECREF(long_zero);
if (cmp < 0)
return 0;
else if (cmp)
x = PY_SSIZE_T_MAX;
else
x = -PY_SSIZE_T_MAX;
}
} else {
}
else if (v->ob_type->tp_as_number &&
PyType_HasFeature(v->ob_type, Py_TPFLAGS_HAVE_INDEX)
&& v->ob_type->tp_as_number->nb_index) {
x = v->ob_type->tp_as_number->nb_index(v);
if (x == -1 && PyErr_Occurred())
return 0;
}
else {
PyErr_SetString(PyExc_TypeError,
"slice indices must be integers or None");
"slice indices must be integers or "
"None or have an __index__ method");
return 0;
}
*pi = x;
@ -3979,8 +3952,11 @@ _PyEval_SliceIndex(PyObject *v, Py_ssize_t *pi)
return 1;
}
#undef ISINT
#define ISINT(x) ((x) == NULL || PyInt_Check(x) || PyLong_Check(x))
#undef ISINDEX
#define ISINDEX(x) ((x) == NULL || PyInt_Check(x) || PyLong_Check(x) || \
((x)->ob_type->tp_as_number && \
PyType_HasFeature((x)->ob_type, Py_TPFLAGS_HAVE_INDEX) \
&& (x)->ob_type->tp_as_number->nb_index))
static PyObject *
apply_slice(PyObject *u, PyObject *v, PyObject *w) /* return u[v:w] */
@ -3988,7 +3964,7 @@ apply_slice(PyObject *u, PyObject *v, PyObject *w) /* return u[v:w] */
PyTypeObject *tp = u->ob_type;
PySequenceMethods *sq = tp->tp_as_sequence;
if (sq && sq->sq_slice && ISINT(v) && ISINT(w)) {
if (sq && sq->sq_slice && ISINDEX(v) && ISINDEX(w)) {
Py_ssize_t ilow = 0, ihigh = PY_SSIZE_T_MAX;
if (!_PyEval_SliceIndex(v, &ilow))
return NULL;
@ -4015,7 +3991,7 @@ assign_slice(PyObject *u, PyObject *v, PyObject *w, PyObject *x)
PyTypeObject *tp = u->ob_type;
PySequenceMethods *sq = tp->tp_as_sequence;
if (sq && sq->sq_slice && ISINT(v) && ISINT(w)) {
if (sq && sq->sq_slice && ISINDEX(v) && ISINDEX(w)) {
Py_ssize_t ilow = 0, ihigh = PY_SSIZE_T_MAX;
if (!_PyEval_SliceIndex(v, &ilow))
return -1;