int
PySlice_GetIndicesEx(PySliceObject *r, Py_ssize_t length,
Py_ssize_t *start, Py_ssize_t *stop, Py_ssize_t *step, Py_ssize_t *slicelength)
{
/* this is harder to get right than you might think */
Py_ssize_t defstart, defstop;
if (r->step == Py_None) {
*step = 1;
}
else {
if (!_PyEval_SliceIndex(r->step, step)) return -1;
if (*step == 0) {
PyErr_SetString(PyExc_ValueError,
"slice step cannot be zero");
return -1;
}
}
defstart = *step < 0 ? length-1 : 0;
defstop = *step < 0 ? -1 : length;
if (r->start == Py_None) {
*start = defstart;
}
else {
if (!_PyEval_SliceIndex(r->start, start)) return -1;
if (*start < 0) *start += length;
if (*start < 0) *start = (*step < 0) ? -1 : 0;
if (*start >= length)
*start = (*step < 0) ? length - 1 : length;
}
if (r->stop == Py_None) {
*stop = defstop;
}
else {
if (!_PyEval_SliceIndex(r->stop, stop)) return -1;
if (*stop < 0) *stop += length;
if (*stop < 0) *stop = (*step < 0) ? -1 : 0;
if (*stop >= length)
*stop = (*step < 0) ? length - 1 : length;
}
if ((*step < 0 && *stop >= *start)
|| (*step > 0 && *start >= *stop)) {
*slicelength = 0;
}
else if (*step < 0) {
*slicelength = (*stop-*start+1)/(*step)+1;
}
else {
*slicelength = (*stop-*start-1)/(*step)+1;
}
return 0;
}
static PyObject *bpy_bmlayercollection_subscript(BPy_BMLayerCollection *self, PyObject *key)
{
/* don't need error check here */
if (PyUnicode_Check(key)) {
return bpy_bmlayercollection_subscript_str(self, _PyUnicode_AsString(key));
}
else if (PyIndex_Check(key)) {
Py_ssize_t i = PyNumber_AsSsize_t(key, PyExc_IndexError);
if (i == -1 && PyErr_Occurred())
return NULL;
return bpy_bmlayercollection_subscript_int(self, i);
}
else if (PySlice_Check(key)) {
PySliceObject *key_slice = (PySliceObject *)key;
Py_ssize_t step = 1;
if (key_slice->step != Py_None && !_PyEval_SliceIndex(key, &step)) {
return NULL;
}
else if (step != 1) {
PyErr_SetString(PyExc_TypeError,
"BMLayerCollection[slice]: slice steps not supported");
return NULL;
}
else if (key_slice->start == Py_None && key_slice->stop == Py_None) {
return bpy_bmlayercollection_subscript_slice(self, 0, PY_SSIZE_T_MAX);
}
else {
Py_ssize_t start = 0, stop = PY_SSIZE_T_MAX;
/* avoid PySlice_GetIndicesEx because it needs to know the length ahead of time. */
if (key_slice->start != Py_None && !_PyEval_SliceIndex(key_slice->start, &start)) return NULL;
if (key_slice->stop != Py_None && !_PyEval_SliceIndex(key_slice->stop, &stop)) return NULL;
if (start < 0 || stop < 0) {
/* only get the length for negative values */
Py_ssize_t len = bpy_bmlayercollection_length(self);
if (start < 0) start += len;
if (stop < 0) stop += len;
}
if (stop - start <= 0) {
return PyTuple_New(0);
}
else {
return bpy_bmlayercollection_subscript_slice(self, start, stop);
}
}
}
else {
PyErr_SetString(PyExc_AttributeError,
"BMLayerCollection[key]: invalid key, key must be an int");
return NULL;
}
}
static int
assign_slice(PyObject *u, PyObject *v, PyObject *w, PyObject *x)
/* u[v:w] = x */
{
int ilow = 0, ihigh = 1<<31;
if (!_PyEval_SliceIndex(v, &ilow))
return -1;
if (!_PyEval_SliceIndex(w, &ihigh))
return -1;
// if (x == NULL)
// return PySequence_DelSlice(u, ilow, ihigh);
// else
return PySequence_SetSlice(u, ilow, ihigh, x);
}
PyObject *
string_count(PyStringObject *self,
PyObject *sub_obj, PyObject* obj_start, PyObject** args)
{
const char *str = PyString_AS_STRING(self), *sub;
Py_ssize_t sub_len;
Py_ssize_t start = 0, end = PY_SSIZE_T_MAX;
PyObject* obj_end = args[0];
/*
if (!stringlib_parse_args_finds("count", args, &sub_obj, &start, &end))
return NULL;
*/
if (obj_start && obj_start != Py_None)
if (!_PyEval_SliceIndex(obj_start, &start))
return 0;
if (obj_end && obj_end != Py_None)
if (!_PyEval_SliceIndex(obj_end, &end))
return 0;
if (PyString_Check(sub_obj)) {
sub = PyString_AS_STRING(sub_obj);
sub_len = PyString_GET_SIZE(sub_obj);
}
#ifdef Py_USING_UNICODE
else if (PyUnicode_Check(sub_obj)) {
Py_ssize_t count;
count = PyUnicode_Count((PyObject *)self, sub_obj, start, end);
if (count == -1)
return NULL;
else
return PyInt_FromSsize_t(count);
}
#endif
else if (PyObject_AsCharBuffer(sub_obj, &sub, &sub_len))
return NULL;
ADJUST_INDICES(start, end, PyString_GET_SIZE(self));
return PyInt_FromSsize_t(
stringlib_count(str + start, end - start, sub, sub_len, PY_SSIZE_T_MAX)
);
}
int
PySlice_Unpack(PyObject *_r,
Py_ssize_t *start, Py_ssize_t *stop, Py_ssize_t *step)
{
PySliceObject *r = (PySliceObject*)_r;
/* this is harder to get right than you might think */
Py_BUILD_ASSERT(PY_SSIZE_T_MIN + 1 <= -PY_SSIZE_T_MAX);
if (r->step == Py_None) {
*step = 1;
}
else {
if (!_PyEval_SliceIndex(r->step, step)) return -1;
if (*step == 0) {
PyErr_SetString(PyExc_ValueError,
"slice step cannot be zero");
return -1;
}
/* Here *step might be -PY_SSIZE_T_MAX-1; in this case we replace it
* with -PY_SSIZE_T_MAX. This doesn't affect the semantics, and it
* guards against later undefined behaviour resulting from code that
* does "step = -step" as part of a slice reversal.
*/
if (*step < -PY_SSIZE_T_MAX)
*step = -PY_SSIZE_T_MAX;
}
if (r->start == Py_None) {
*start = *step < 0 ? PY_SSIZE_T_MAX : 0;
}
else {
if (!_PyEval_SliceIndex(r->start, start)) return -1;
}
if (r->stop == Py_None) {
*stop = *step < 0 ? PY_SSIZE_T_MIN : PY_SSIZE_T_MAX;
}
else {
if (!_PyEval_SliceIndex(r->stop, stop)) return -1;
}
return 0;
}
Box* tupleIndex(BoxedTuple* self, Box* elt, Box* startBox, Box** args) {
Box* endBox = args[0];
Py_ssize_t start, end;
_PyEval_SliceIndex(startBox, &start);
_PyEval_SliceIndex(endBox, &end);
Py_ssize_t size = self->size();
if (start < 0) {
start += size;
if (start < 0) {
start = 0;
}
}
if (end < 0) {
end += size;
if (end < 0) {
end = 0;
}
} else if (end > size) {
end = size;
}
for (Py_ssize_t i = start; i < end; i++) {
Box* e = self->elts[i];
int r = PyObject_RichCompareBool(e, elt, Py_EQ);
if (r == -1)
throwCAPIException();
if (r)
return boxInt(i);
}
raiseExcHelper(ValueError, "tuple.index(x): x not in tuple");
}
int
PySlice_GetIndicesEx(PyObject *_r, Py_ssize_t length,
Py_ssize_t *start, Py_ssize_t *stop, Py_ssize_t *step,
Py_ssize_t *slicelength)
{
PySliceObject *r = (PySliceObject*)_r;
/* this is harder to get right than you might think */
Py_ssize_t defstart, defstop;
if (r->step == Py_None) {
*step = 1;
}
else {
if (!_PyEval_SliceIndex(r->step, step)) return -1;
if (*step == 0) {
PyErr_SetString(PyExc_ValueError,
"slice step cannot be zero");
return -1;
}
/* Here *step might be -PY_SSIZE_T_MAX-1; in this case we replace it
* with -PY_SSIZE_T_MAX. This doesn't affect the semantics, and it
* guards against later undefined behaviour resulting from code that
* does "step = -step" as part of a slice reversal.
*/
if (*step < -PY_SSIZE_T_MAX)
*step = -PY_SSIZE_T_MAX;
}
defstart = *step < 0 ? length-1 : 0;
defstop = *step < 0 ? -1 : length;
if (r->start == Py_None) {
*start = defstart;
}
else {
if (!_PyEval_SliceIndex(r->start, start)) return -1;
if (*start < 0) *start += length;
if (*start < 0) *start = (*step < 0) ? -1 : 0;
if (*start >= length)
*start = (*step < 0) ? length - 1 : length;
}
if (r->stop == Py_None) {
*stop = defstop;
}
else {
if (!_PyEval_SliceIndex(r->stop, stop)) return -1;
if (*stop < 0) *stop += length;
if (*stop < 0) *stop = (*step < 0) ? -1 : 0;
if (*stop >= length)
*stop = (*step < 0) ? length - 1 : length;
}
if ((*step < 0 && *stop >= *start)
|| (*step > 0 && *start >= *stop)) {
*slicelength = 0;
}
else if (*step < 0) {
*slicelength = (*stop-*start+1)/(*step)+1;
}
else {
*slicelength = (*stop-*start-1)/(*step)+1;
}
return 0;
}