Guido van Rossum | 12d12c5 | 1993-10-26 17:58:25 +0000 | [diff] [blame] | 1 | |
| 2 | /* Range object implementation */ |
| 3 | |
Guido van Rossum | c0b618a | 1997-05-02 03:12:38 +0000 | [diff] [blame] | 4 | #include "Python.h" |
Thomas Wouters | efafcea | 2001-07-09 12:30:54 +0000 | [diff] [blame] | 5 | |
Guido van Rossum | 12d12c5 | 1993-10-26 17:58:25 +0000 | [diff] [blame] | 6 | typedef struct { |
Guido van Rossum | c0b618a | 1997-05-02 03:12:38 +0000 | [diff] [blame] | 7 | PyObject_HEAD |
Guido van Rossum | 12d12c5 | 1993-10-26 17:58:25 +0000 | [diff] [blame] | 8 | long start; |
| 9 | long step; |
| 10 | long len; |
Guido van Rossum | 12d12c5 | 1993-10-26 17:58:25 +0000 | [diff] [blame] | 11 | } rangeobject; |
| 12 | |
Thomas Wouters | efafcea | 2001-07-09 12:30:54 +0000 | [diff] [blame] | 13 | PyObject * |
| 14 | PyRange_New(long start, long len, long step, int reps) |
| 15 | { |
Fred Drake | d901832 | 2002-05-02 19:56:55 +0000 | [diff] [blame] | 16 | rangeobject *obj; |
Guido van Rossum | 12d12c5 | 1993-10-26 17:58:25 +0000 | [diff] [blame] | 17 | |
Fred Drake | d901832 | 2002-05-02 19:56:55 +0000 | [diff] [blame] | 18 | if (reps != 1) { |
| 19 | PyErr_SetString(PyExc_ValueError, |
| 20 | "PyRange_New's 'repetitions' argument must be 1"); |
| 21 | return NULL; |
| 22 | } |
| 23 | |
| 24 | obj = PyObject_New(rangeobject, &PyRange_Type); |
Guido van Rossum | 9e8f4ea | 2000-12-14 14:59:53 +0000 | [diff] [blame] | 25 | if (obj == NULL) |
| 26 | return NULL; |
| 27 | |
Fred Drake | d901832 | 2002-05-02 19:56:55 +0000 | [diff] [blame] | 28 | if (len == 0) { |
Guido van Rossum | 65e0b99 | 2001-01-15 18:58:56 +0000 | [diff] [blame] | 29 | start = 0; |
| 30 | len = 0; |
| 31 | step = 1; |
Guido van Rossum | 65e0b99 | 2001-01-15 18:58:56 +0000 | [diff] [blame] | 32 | } |
| 33 | else { |
| 34 | long last = start + (len - 1) * step; |
| 35 | if ((step > 0) ? |
Thomas Wouters | efafcea | 2001-07-09 12:30:54 +0000 | [diff] [blame] | 36 | (last > (PyInt_GetMax() - step)) : |
| 37 | (last < (-1 - PyInt_GetMax() - step))) { |
Guido van Rossum | 65e0b99 | 2001-01-15 18:58:56 +0000 | [diff] [blame] | 38 | PyErr_SetString(PyExc_OverflowError, |
| 39 | "integer addition"); |
| 40 | return NULL; |
Thomas Wouters | efafcea | 2001-07-09 12:30:54 +0000 | [diff] [blame] | 41 | } |
Guido van Rossum | 65e0b99 | 2001-01-15 18:58:56 +0000 | [diff] [blame] | 42 | } |
Guido van Rossum | 12d12c5 | 1993-10-26 17:58:25 +0000 | [diff] [blame] | 43 | obj->start = start; |
| 44 | obj->len = len; |
| 45 | obj->step = step; |
Guido van Rossum | 12d12c5 | 1993-10-26 17:58:25 +0000 | [diff] [blame] | 46 | |
Guido van Rossum | c0b618a | 1997-05-02 03:12:38 +0000 | [diff] [blame] | 47 | return (PyObject *) obj; |
Guido van Rossum | 12d12c5 | 1993-10-26 17:58:25 +0000 | [diff] [blame] | 48 | } |
| 49 | |
Guido van Rossum | c0b618a | 1997-05-02 03:12:38 +0000 | [diff] [blame] | 50 | static PyObject * |
Fred Drake | 45cfbcc | 2000-07-09 06:21:27 +0000 | [diff] [blame] | 51 | range_item(rangeobject *r, int i) |
Guido van Rossum | 12d12c5 | 1993-10-26 17:58:25 +0000 | [diff] [blame] | 52 | { |
Fred Drake | d901832 | 2002-05-02 19:56:55 +0000 | [diff] [blame] | 53 | if (i < 0 || i >= r->len) { |
| 54 | PyErr_SetString(PyExc_IndexError, |
Guido van Rossum | 5dadf7e | 1999-01-09 21:40:35 +0000 | [diff] [blame] | 55 | "xrange object index out of range"); |
Fred Drake | d901832 | 2002-05-02 19:56:55 +0000 | [diff] [blame] | 56 | return NULL; |
| 57 | } |
Guido van Rossum | c0b618a | 1997-05-02 03:12:38 +0000 | [diff] [blame] | 58 | return PyInt_FromLong(r->start + (i % r->len) * r->step); |
Guido van Rossum | 12d12c5 | 1993-10-26 17:58:25 +0000 | [diff] [blame] | 59 | } |
| 60 | |
| 61 | static int |
Fred Drake | 45cfbcc | 2000-07-09 06:21:27 +0000 | [diff] [blame] | 62 | range_length(rangeobject *r) |
Guido van Rossum | 12d12c5 | 1993-10-26 17:58:25 +0000 | [diff] [blame] | 63 | { |
Fred Drake | d901832 | 2002-05-02 19:56:55 +0000 | [diff] [blame] | 64 | return r->len; |
Guido van Rossum | 7d6aa51 | 1993-12-21 22:50:31 +0000 | [diff] [blame] | 65 | } |
| 66 | |
Guido van Rossum | c0b618a | 1997-05-02 03:12:38 +0000 | [diff] [blame] | 67 | static PyObject * |
Fred Drake | 45cfbcc | 2000-07-09 06:21:27 +0000 | [diff] [blame] | 68 | range_repr(rangeobject *r) |
Guido van Rossum | 12d12c5 | 1993-10-26 17:58:25 +0000 | [diff] [blame] | 69 | { |
Barry Warsaw | 7ce3694 | 2001-08-24 18:34:26 +0000 | [diff] [blame] | 70 | PyObject *rtn; |
| 71 | |
Tim Peters | 72d421b | 2000-08-04 03:05:40 +0000 | [diff] [blame] | 72 | if (r->start == 0 && r->step == 1) |
Barry Warsaw | 7ce3694 | 2001-08-24 18:34:26 +0000 | [diff] [blame] | 73 | rtn = PyString_FromFormat("xrange(%ld)", |
| 74 | r->start + r->len * r->step); |
Tim Peters | 72d421b | 2000-08-04 03:05:40 +0000 | [diff] [blame] | 75 | |
| 76 | else if (r->step == 1) |
Barry Warsaw | 7ce3694 | 2001-08-24 18:34:26 +0000 | [diff] [blame] | 77 | rtn = PyString_FromFormat("xrange(%ld, %ld)", |
| 78 | r->start, |
| 79 | r->start + r->len * r->step); |
Tim Peters | 72d421b | 2000-08-04 03:05:40 +0000 | [diff] [blame] | 80 | |
| 81 | else |
Barry Warsaw | 7ce3694 | 2001-08-24 18:34:26 +0000 | [diff] [blame] | 82 | rtn = PyString_FromFormat("xrange(%ld, %ld, %ld)", |
| 83 | r->start, |
| 84 | r->start + r->len * r->step, |
| 85 | r->step); |
Barry Warsaw | 7ce3694 | 2001-08-24 18:34:26 +0000 | [diff] [blame] | 86 | return rtn; |
Thomas Wouters | efafcea | 2001-07-09 12:30:54 +0000 | [diff] [blame] | 87 | } |
| 88 | |
Guido van Rossum | c0b618a | 1997-05-02 03:12:38 +0000 | [diff] [blame] | 89 | static PySequenceMethods range_as_sequence = { |
Fred Drake | d901832 | 2002-05-02 19:56:55 +0000 | [diff] [blame] | 90 | (inquiry)range_length, /* sq_length */ |
| 91 | 0, /* sq_concat */ |
| 92 | 0, /* sq_repeat */ |
| 93 | (intargfunc)range_item, /* sq_item */ |
| 94 | 0, /* sq_slice */ |
Guido van Rossum | 12d12c5 | 1993-10-26 17:58:25 +0000 | [diff] [blame] | 95 | }; |
| 96 | |
Raymond Hettinger | 48165d4 | 2002-06-05 20:08:48 +0000 | [diff] [blame] | 97 | staticforward PyObject * range_iter(PyObject *seq); |
| 98 | |
Guido van Rossum | c0b618a | 1997-05-02 03:12:38 +0000 | [diff] [blame] | 99 | PyTypeObject PyRange_Type = { |
| 100 | PyObject_HEAD_INIT(&PyType_Type) |
Fred Drake | d901832 | 2002-05-02 19:56:55 +0000 | [diff] [blame] | 101 | 0, /* Number of items for varobject */ |
| 102 | "xrange", /* Name of this type */ |
| 103 | sizeof(rangeobject), /* Basic object size */ |
| 104 | 0, /* Item size for varobject */ |
| 105 | (destructor)PyObject_Del, /* tp_dealloc */ |
| 106 | 0, /* tp_print */ |
| 107 | 0, /* tp_getattr */ |
| 108 | 0, /* tp_setattr */ |
| 109 | 0, /* tp_compare */ |
| 110 | (reprfunc)range_repr, /* tp_repr */ |
| 111 | 0, /* tp_as_number */ |
| 112 | &range_as_sequence, /* tp_as_sequence */ |
| 113 | 0, /* tp_as_mapping */ |
| 114 | 0, /* tp_hash */ |
| 115 | 0, /* tp_call */ |
| 116 | 0, /* tp_str */ |
Raymond Hettinger | 48165d4 | 2002-06-05 20:08:48 +0000 | [diff] [blame] | 117 | 0, /* tp_getattro */ |
Fred Drake | d901832 | 2002-05-02 19:56:55 +0000 | [diff] [blame] | 118 | 0, /* tp_setattro */ |
| 119 | 0, /* tp_as_buffer */ |
| 120 | Py_TPFLAGS_DEFAULT, /* tp_flags */ |
| 121 | 0, /* tp_doc */ |
Martin v. Löwis | e452659 | 2002-05-08 08:49:27 +0000 | [diff] [blame] | 122 | 0, /* tp_traverse */ |
| 123 | 0, /* tp_clear */ |
| 124 | 0, /* tp_richcompare */ |
| 125 | 0, /* tp_weaklistoffset */ |
Raymond Hettinger | 48165d4 | 2002-06-05 20:08:48 +0000 | [diff] [blame] | 126 | (getiterfunc)range_iter, /* tp_iter */ |
Guido van Rossum | 12d12c5 | 1993-10-26 17:58:25 +0000 | [diff] [blame] | 127 | }; |
Raymond Hettinger | 48165d4 | 2002-06-05 20:08:48 +0000 | [diff] [blame] | 128 | |
| 129 | /*********************** Xrange Iterator **************************/ |
| 130 | |
| 131 | typedef struct { |
| 132 | PyObject_HEAD |
| 133 | long index; |
| 134 | long start; |
| 135 | long step; |
| 136 | long len; |
| 137 | } rangeiterobject; |
| 138 | |
| 139 | PyTypeObject Pyrangeiter_Type; |
| 140 | |
| 141 | PyObject * |
| 142 | range_iter(PyObject *seq) |
| 143 | { |
| 144 | rangeiterobject *it; |
| 145 | |
| 146 | if (!PyRange_Check(seq)) { |
| 147 | PyErr_BadInternalCall(); |
| 148 | return NULL; |
| 149 | } |
| 150 | it = PyObject_New(rangeiterobject, &Pyrangeiter_Type); |
| 151 | if (it == NULL) |
| 152 | return NULL; |
| 153 | it->index = 0; |
| 154 | it->start = ((rangeobject *)seq)->start; |
| 155 | it->step = ((rangeobject *)seq)->step; |
| 156 | it->len = ((rangeobject *)seq)->len; |
| 157 | return (PyObject *)it; |
| 158 | } |
| 159 | |
| 160 | static PyObject * |
| 161 | rangeiter_getiter(PyObject *it) |
| 162 | { |
| 163 | Py_INCREF(it); |
| 164 | return it; |
| 165 | } |
| 166 | |
| 167 | static PyObject * |
| 168 | rangeiter_next(rangeiterobject *r) |
| 169 | { |
| 170 | if (r->index < r->len) |
| 171 | return PyInt_FromLong(r->start + (r->index++) * r->step); |
| 172 | PyErr_SetObject(PyExc_StopIteration, Py_None); |
| 173 | return NULL; |
| 174 | } |
| 175 | |
| 176 | static PyMethodDef rangeiter_methods[] = { |
| 177 | {"next", (PyCFunction)rangeiter_next, METH_NOARGS, |
| 178 | "it.next() -- get the next value, or raise StopIteration"}, |
| 179 | {NULL, NULL} /* sentinel */ |
| 180 | }; |
| 181 | |
| 182 | PyTypeObject Pyrangeiter_Type = { |
| 183 | PyObject_HEAD_INIT(&PyType_Type) |
| 184 | 0, /* ob_size */ |
| 185 | "rangeiterator", /* tp_name */ |
| 186 | sizeof(rangeiterobject), /* tp_basicsize */ |
| 187 | 0, /* tp_itemsize */ |
| 188 | /* methods */ |
| 189 | (destructor)PyObject_Del, /* tp_dealloc */ |
| 190 | 0, /* tp_print */ |
| 191 | 0, /* tp_getattr */ |
| 192 | 0, /* tp_setattr */ |
| 193 | 0, /* tp_compare */ |
| 194 | 0, /* tp_repr */ |
| 195 | 0, /* tp_as_number */ |
| 196 | 0, /* tp_as_sequence */ |
| 197 | 0, /* tp_as_mapping */ |
| 198 | 0, /* tp_hash */ |
| 199 | 0, /* tp_call */ |
| 200 | 0, /* tp_str */ |
| 201 | PyObject_GenericGetAttr, /* tp_getattro */ |
| 202 | 0, /* tp_setattro */ |
| 203 | 0, /* tp_as_buffer */ |
| 204 | Py_TPFLAGS_DEFAULT, /* tp_flags */ |
| 205 | 0, /* tp_doc */ |
| 206 | 0, /* tp_traverse */ |
| 207 | 0, /* tp_clear */ |
| 208 | 0, /* tp_richcompare */ |
| 209 | 0, /* tp_weaklistoffset */ |
| 210 | (getiterfunc)rangeiter_getiter, /* tp_iter */ |
| 211 | (iternextfunc)rangeiter_next, /* tp_iternext */ |
| 212 | rangeiter_methods, /* tp_methods */ |
| 213 | }; |
| 214 | |