diff options
Diffstat (limited to 'AppPkg/Applications/Python/Python-2.7.2/Objects/sliceobject.c')
| -rw-r--r-- | AppPkg/Applications/Python/Python-2.7.2/Objects/sliceobject.c | 361 |
1 files changed, 361 insertions, 0 deletions
diff --git a/AppPkg/Applications/Python/Python-2.7.2/Objects/sliceobject.c b/AppPkg/Applications/Python/Python-2.7.2/Objects/sliceobject.c new file mode 100644 index 0000000000..63b1e4f905 --- /dev/null +++ b/AppPkg/Applications/Python/Python-2.7.2/Objects/sliceobject.c @@ -0,0 +1,361 @@ +/*
+Written by Jim Hugunin and Chris Chase.
+
+This includes both the singular ellipsis object and slice objects.
+
+Guido, feel free to do whatever you want in the way of copyrights
+for this file.
+*/
+
+/*
+Py_Ellipsis encodes the '...' rubber index token. It is similar to
+the Py_NoneStruct in that there is no way to create other objects of
+this type and there is exactly one in existence.
+*/
+
+#include "Python.h"
+#include "structmember.h"
+
+static PyObject *
+ellipsis_repr(PyObject *op)
+{
+ return PyString_FromString("Ellipsis");
+}
+
+PyTypeObject PyEllipsis_Type = {
+ PyVarObject_HEAD_INIT(&PyType_Type, 0)
+ "ellipsis", /* tp_name */
+ 0, /* tp_basicsize */
+ 0, /* tp_itemsize */
+ 0, /*never called*/ /* tp_dealloc */
+ 0, /* tp_print */
+ 0, /* tp_getattr */
+ 0, /* tp_setattr */
+ 0, /* tp_compare */
+ ellipsis_repr, /* 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 */
+};
+
+PyObject _Py_EllipsisObject = {
+ _PyObject_EXTRA_INIT
+ 1, &PyEllipsis_Type
+};
+
+
+/* Slice object implementation
+
+ start, stop, and step are python objects with None indicating no
+ index is present.
+*/
+
+PyObject *
+PySlice_New(PyObject *start, PyObject *stop, PyObject *step)
+{
+ PySliceObject *obj = PyObject_New(PySliceObject, &PySlice_Type);
+
+ if (obj == NULL)
+ return NULL;
+
+ if (step == NULL) step = Py_None;
+ Py_INCREF(step);
+ if (start == NULL) start = Py_None;
+ Py_INCREF(start);
+ if (stop == NULL) stop = Py_None;
+ Py_INCREF(stop);
+
+ obj->step = step;
+ obj->start = start;
+ obj->stop = stop;
+
+ return (PyObject *) obj;
+}
+
+PyObject *
+_PySlice_FromIndices(Py_ssize_t istart, Py_ssize_t istop)
+{
+ PyObject *start, *end, *slice;
+ start = PyInt_FromSsize_t(istart);
+ if (!start)
+ return NULL;
+ end = PyInt_FromSsize_t(istop);
+ if (!end) {
+ Py_DECREF(start);
+ return NULL;
+ }
+
+ slice = PySlice_New(start, end, NULL);
+ Py_DECREF(start);
+ Py_DECREF(end);
+ return slice;
+}
+
+int
+PySlice_GetIndices(PySliceObject *r, Py_ssize_t length,
+ Py_ssize_t *start, Py_ssize_t *stop, Py_ssize_t *step)
+{
+ /* XXX support long ints */
+ if (r->step == Py_None) {
+ *step = 1;
+ } else {
+ if (!PyInt_Check(r->step) && !PyLong_Check(r->step)) return -1;
+ *step = PyInt_AsSsize_t(r->step);
+ }
+ if (r->start == Py_None) {
+ *start = *step < 0 ? length-1 : 0;
+ } else {
+ if (!PyInt_Check(r->start) && !PyLong_Check(r->step)) return -1;
+ *start = PyInt_AsSsize_t(r->start);
+ if (*start < 0) *start += length;
+ }
+ if (r->stop == Py_None) {
+ *stop = *step < 0 ? -1 : length;
+ } else {
+ if (!PyInt_Check(r->stop) && !PyLong_Check(r->step)) return -1;
+ *stop = PyInt_AsSsize_t(r->stop);
+ if (*stop < 0) *stop += length;
+ }
+ if (*stop > length) return -1;
+ if (*start >= length) return -1;
+ if (*step == 0) return -1;
+ return 0;
+}
+
+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 *
+slice_new(PyTypeObject *type, PyObject *args, PyObject *kw)
+{
+ PyObject *start, *stop, *step;
+
+ start = stop = step = NULL;
+
+ if (!_PyArg_NoKeywords("slice()", kw))
+ return NULL;
+
+ if (!PyArg_UnpackTuple(args, "slice", 1, 3, &start, &stop, &step))
+ return NULL;
+
+ /* This swapping of stop and start is to maintain similarity with
+ range(). */
+ if (stop == NULL) {
+ stop = start;
+ start = NULL;
+ }
+ return PySlice_New(start, stop, step);
+}
+
+PyDoc_STRVAR(slice_doc,
+"slice([start,] stop[, step])\n\
+\n\
+Create a slice object. This is used for extended slicing (e.g. a[0:10:2]).");
+
+static void
+slice_dealloc(PySliceObject *r)
+{
+ Py_DECREF(r->step);
+ Py_DECREF(r->start);
+ Py_DECREF(r->stop);
+ PyObject_Del(r);
+}
+
+static PyObject *
+slice_repr(PySliceObject *r)
+{
+ PyObject *s, *comma;
+
+ s = PyString_FromString("slice(");
+ comma = PyString_FromString(", ");
+ PyString_ConcatAndDel(&s, PyObject_Repr(r->start));
+ PyString_Concat(&s, comma);
+ PyString_ConcatAndDel(&s, PyObject_Repr(r->stop));
+ PyString_Concat(&s, comma);
+ PyString_ConcatAndDel(&s, PyObject_Repr(r->step));
+ PyString_ConcatAndDel(&s, PyString_FromString(")"));
+ Py_DECREF(comma);
+ return s;
+}
+
+static PyMemberDef slice_members[] = {
+ {"start", T_OBJECT, offsetof(PySliceObject, start), READONLY},
+ {"stop", T_OBJECT, offsetof(PySliceObject, stop), READONLY},
+ {"step", T_OBJECT, offsetof(PySliceObject, step), READONLY},
+ {0}
+};
+
+static PyObject*
+slice_indices(PySliceObject* self, PyObject* len)
+{
+ Py_ssize_t ilen, start, stop, step, slicelength;
+
+ ilen = PyNumber_AsSsize_t(len, PyExc_OverflowError);
+
+ if (ilen == -1 && PyErr_Occurred()) {
+ return NULL;
+ }
+
+ if (PySlice_GetIndicesEx(self, ilen, &start, &stop,
+ &step, &slicelength) < 0) {
+ return NULL;
+ }
+
+ return Py_BuildValue("(nnn)", start, stop, step);
+}
+
+PyDoc_STRVAR(slice_indices_doc,
+"S.indices(len) -> (start, stop, stride)\n\
+\n\
+Assuming a sequence of length len, calculate the start and stop\n\
+indices, and the stride length of the extended slice described by\n\
+S. Out of bounds indices are clipped in a manner consistent with the\n\
+handling of normal slices.");
+
+static PyObject *
+slice_reduce(PySliceObject* self)
+{
+ return Py_BuildValue("O(OOO)", Py_TYPE(self), self->start, self->stop, self->step);
+}
+
+PyDoc_STRVAR(reduce_doc, "Return state information for pickling.");
+
+static PyMethodDef slice_methods[] = {
+ {"indices", (PyCFunction)slice_indices,
+ METH_O, slice_indices_doc},
+ {"__reduce__", (PyCFunction)slice_reduce,
+ METH_NOARGS, reduce_doc},
+ {NULL, NULL}
+};
+
+static int
+slice_compare(PySliceObject *v, PySliceObject *w)
+{
+ int result = 0;
+
+ if (v == w)
+ return 0;
+
+ if (PyObject_Cmp(v->start, w->start, &result) < 0)
+ return -2;
+ if (result != 0)
+ return result;
+ if (PyObject_Cmp(v->stop, w->stop, &result) < 0)
+ return -2;
+ if (result != 0)
+ return result;
+ if (PyObject_Cmp(v->step, w->step, &result) < 0)
+ return -2;
+ return result;
+}
+
+static long
+slice_hash(PySliceObject *v)
+{
+ PyErr_SetString(PyExc_TypeError, "unhashable type");
+ return -1L;
+}
+
+PyTypeObject PySlice_Type = {
+ PyVarObject_HEAD_INIT(&PyType_Type, 0)
+ "slice", /* Name of this type */
+ sizeof(PySliceObject), /* Basic object size */
+ 0, /* Item size for varobject */
+ (destructor)slice_dealloc, /* tp_dealloc */
+ 0, /* tp_print */
+ 0, /* tp_getattr */
+ 0, /* tp_setattr */
+ (cmpfunc)slice_compare, /* tp_compare */
+ (reprfunc)slice_repr, /* tp_repr */
+ 0, /* tp_as_number */
+ 0, /* tp_as_sequence */
+ 0, /* tp_as_mapping */
+ (hashfunc)slice_hash, /* tp_hash */
+ 0, /* tp_call */
+ 0, /* tp_str */
+ PyObject_GenericGetAttr, /* tp_getattro */
+ 0, /* tp_setattro */
+ 0, /* tp_as_buffer */
+ Py_TPFLAGS_DEFAULT, /* tp_flags */
+ slice_doc, /* tp_doc */
+ 0, /* tp_traverse */
+ 0, /* tp_clear */
+ 0, /* tp_richcompare */
+ 0, /* tp_weaklistoffset */
+ 0, /* tp_iter */
+ 0, /* tp_iternext */
+ slice_methods, /* tp_methods */
+ slice_members, /* 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 */
+ slice_new, /* tp_new */
+};
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