| |
| /* Range object implementation */ |
| |
| #include "Python.h" |
| |
| typedef struct { |
| PyObject_HEAD |
| long start; |
| long step; |
| long len; |
| } rangeobject; |
| |
| PyObject * |
| PyRange_New(long start, long len, long step, int reps) |
| { |
| rangeobject *obj; |
| |
| if (reps != 1) { |
| PyErr_SetString(PyExc_ValueError, |
| "PyRange_New's 'repetitions' argument must be 1"); |
| return NULL; |
| } |
| |
| obj = PyObject_New(rangeobject, &PyRange_Type); |
| if (obj == NULL) |
| return NULL; |
| |
| if (len == 0) { |
| start = 0; |
| len = 0; |
| step = 1; |
| } |
| else { |
| long last = start + (len - 1) * step; |
| if ((step > 0) ? |
| (last > (PyInt_GetMax() - step)) : |
| (last < (-1 - PyInt_GetMax() - step))) { |
| PyErr_SetString(PyExc_OverflowError, |
| "integer addition"); |
| return NULL; |
| } |
| } |
| obj->start = start; |
| obj->len = len; |
| obj->step = step; |
| |
| return (PyObject *) obj; |
| } |
| |
| static PyObject * |
| range_item(rangeobject *r, int i) |
| { |
| if (i < 0 || i >= r->len) { |
| PyErr_SetString(PyExc_IndexError, |
| "xrange object index out of range"); |
| return NULL; |
| } |
| return PyInt_FromLong(r->start + (i % r->len) * r->step); |
| } |
| |
| static int |
| range_length(rangeobject *r) |
| { |
| return r->len; |
| } |
| |
| static PyObject * |
| range_repr(rangeobject *r) |
| { |
| PyObject *rtn; |
| |
| if (r->start == 0 && r->step == 1) |
| rtn = PyString_FromFormat("xrange(%ld)", |
| r->start + r->len * r->step); |
| |
| else if (r->step == 1) |
| rtn = PyString_FromFormat("xrange(%ld, %ld)", |
| r->start, |
| r->start + r->len * r->step); |
| |
| else |
| rtn = PyString_FromFormat("xrange(%ld, %ld, %ld)", |
| r->start, |
| r->start + r->len * r->step, |
| r->step); |
| return rtn; |
| } |
| |
| static PySequenceMethods range_as_sequence = { |
| (inquiry)range_length, /* sq_length */ |
| 0, /* sq_concat */ |
| 0, /* sq_repeat */ |
| (intargfunc)range_item, /* sq_item */ |
| 0, /* sq_slice */ |
| }; |
| |
| PyTypeObject PyRange_Type = { |
| PyObject_HEAD_INIT(&PyType_Type) |
| 0, /* Number of items for varobject */ |
| "xrange", /* Name of this type */ |
| sizeof(rangeobject), /* Basic object size */ |
| 0, /* Item size for varobject */ |
| (destructor)PyObject_Del, /* tp_dealloc */ |
| 0, /* tp_print */ |
| 0, /* tp_getattr */ |
| 0, /* tp_setattr */ |
| 0, /* tp_compare */ |
| (reprfunc)range_repr, /* tp_repr */ |
| 0, /* tp_as_number */ |
| &range_as_sequence, /* 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, /* tp_flags */ |
| 0, /* tp_doc */ |
| }; |