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" |
Fred Drake | 0b796fa | 2000-11-08 19:42:43 +0000 | [diff] [blame] | 5 | #include "structmember.h" |
| 6 | #include <string.h> |
Guido van Rossum | 12d12c5 | 1993-10-26 17:58:25 +0000 | [diff] [blame] | 7 | |
Thomas Wouters | efafcea | 2001-07-09 12:30:54 +0000 | [diff] [blame] | 8 | #define WARN(msg) if (PyErr_Warn(PyExc_DeprecationWarning, msg) < 0) \ |
| 9 | return NULL; |
| 10 | |
Guido van Rossum | 12d12c5 | 1993-10-26 17:58:25 +0000 | [diff] [blame] | 11 | typedef struct { |
Guido van Rossum | c0b618a | 1997-05-02 03:12:38 +0000 | [diff] [blame] | 12 | PyObject_HEAD |
Guido van Rossum | 12d12c5 | 1993-10-26 17:58:25 +0000 | [diff] [blame] | 13 | long start; |
| 14 | long step; |
| 15 | long len; |
Thomas Wouters | efafcea | 2001-07-09 12:30:54 +0000 | [diff] [blame] | 16 | int reps; |
| 17 | long totlen; |
Guido van Rossum | 12d12c5 | 1993-10-26 17:58:25 +0000 | [diff] [blame] | 18 | } rangeobject; |
| 19 | |
Thomas Wouters | efafcea | 2001-07-09 12:30:54 +0000 | [diff] [blame] | 20 | static int |
| 21 | long_mul(long i, long j, long *kk) |
Guido van Rossum | 12d12c5 | 1993-10-26 17:58:25 +0000 | [diff] [blame] | 22 | { |
Thomas Wouters | efafcea | 2001-07-09 12:30:54 +0000 | [diff] [blame] | 23 | PyObject *a; |
| 24 | PyObject *b; |
| 25 | PyObject *c; |
| 26 | |
| 27 | if ((a = PyInt_FromLong(i)) == NULL) |
| 28 | return 0; |
| 29 | |
| 30 | if ((b = PyInt_FromLong(j)) == NULL) |
| 31 | return 0; |
| 32 | |
| 33 | c = PyNumber_Multiply(a, b); |
| 34 | |
| 35 | Py_DECREF(a); |
| 36 | Py_DECREF(b); |
| 37 | |
| 38 | if (c == NULL) |
| 39 | return 0; |
| 40 | |
| 41 | *kk = PyInt_AS_LONG(c); |
| 42 | Py_DECREF(c); |
| 43 | |
| 44 | if (*kk > INT_MAX) { |
| 45 | PyErr_SetString(PyExc_OverflowError, |
| 46 | "integer multiplication"); |
| 47 | return 0; |
| 48 | } |
| 49 | else |
| 50 | return 1; |
| 51 | } |
| 52 | |
| 53 | PyObject * |
| 54 | PyRange_New(long start, long len, long step, int reps) |
| 55 | { |
| 56 | long totlen = -1; |
Guido van Rossum | c0b618a | 1997-05-02 03:12:38 +0000 | [diff] [blame] | 57 | rangeobject *obj = PyObject_NEW(rangeobject, &PyRange_Type); |
Guido van Rossum | 12d12c5 | 1993-10-26 17:58:25 +0000 | [diff] [blame] | 58 | |
Guido van Rossum | 9e8f4ea | 2000-12-14 14:59:53 +0000 | [diff] [blame] | 59 | if (obj == NULL) |
| 60 | return NULL; |
Thomas Wouters | efafcea | 2001-07-09 12:30:54 +0000 | [diff] [blame] | 61 | |
| 62 | if (reps != 1) |
| 63 | WARN("PyRange_New's 'repetitions' argument is deprecated"); |
Guido van Rossum | 9e8f4ea | 2000-12-14 14:59:53 +0000 | [diff] [blame] | 64 | |
Thomas Wouters | efafcea | 2001-07-09 12:30:54 +0000 | [diff] [blame] | 65 | if (len == 0 || reps <= 0) { |
Guido van Rossum | 65e0b99 | 2001-01-15 18:58:56 +0000 | [diff] [blame] | 66 | start = 0; |
| 67 | len = 0; |
| 68 | step = 1; |
Thomas Wouters | efafcea | 2001-07-09 12:30:54 +0000 | [diff] [blame] | 69 | reps = 1; |
| 70 | totlen = 0; |
Guido van Rossum | 65e0b99 | 2001-01-15 18:58:56 +0000 | [diff] [blame] | 71 | } |
| 72 | else { |
| 73 | long last = start + (len - 1) * step; |
| 74 | if ((step > 0) ? |
Thomas Wouters | efafcea | 2001-07-09 12:30:54 +0000 | [diff] [blame] | 75 | (last > (PyInt_GetMax() - step)) : |
| 76 | (last < (-1 - PyInt_GetMax() - step))) { |
Guido van Rossum | 65e0b99 | 2001-01-15 18:58:56 +0000 | [diff] [blame] | 77 | PyErr_SetString(PyExc_OverflowError, |
| 78 | "integer addition"); |
| 79 | return NULL; |
Thomas Wouters | efafcea | 2001-07-09 12:30:54 +0000 | [diff] [blame] | 80 | } |
| 81 | if (! long_mul(len, (long) reps, &totlen)) { |
| 82 | if(!PyErr_ExceptionMatches(PyExc_OverflowError)) |
| 83 | return NULL; |
| 84 | PyErr_Clear(); |
| 85 | totlen = -1; |
Guido van Rossum | 65e0b99 | 2001-01-15 18:58:56 +0000 | [diff] [blame] | 86 | } |
| 87 | } |
| 88 | |
Guido van Rossum | 12d12c5 | 1993-10-26 17:58:25 +0000 | [diff] [blame] | 89 | obj->start = start; |
| 90 | obj->len = len; |
| 91 | obj->step = step; |
Thomas Wouters | efafcea | 2001-07-09 12:30:54 +0000 | [diff] [blame] | 92 | obj->reps = reps; |
| 93 | obj->totlen = totlen; |
Guido van Rossum | 12d12c5 | 1993-10-26 17:58:25 +0000 | [diff] [blame] | 94 | |
Guido van Rossum | c0b618a | 1997-05-02 03:12:38 +0000 | [diff] [blame] | 95 | return (PyObject *) obj; |
Guido van Rossum | 12d12c5 | 1993-10-26 17:58:25 +0000 | [diff] [blame] | 96 | } |
| 97 | |
| 98 | static void |
Fred Drake | 45cfbcc | 2000-07-09 06:21:27 +0000 | [diff] [blame] | 99 | range_dealloc(rangeobject *r) |
Guido van Rossum | 12d12c5 | 1993-10-26 17:58:25 +0000 | [diff] [blame] | 100 | { |
Guido van Rossum | b18618d | 2000-05-03 23:44:39 +0000 | [diff] [blame] | 101 | PyObject_DEL(r); |
Guido van Rossum | 12d12c5 | 1993-10-26 17:58:25 +0000 | [diff] [blame] | 102 | } |
| 103 | |
Guido van Rossum | c0b618a | 1997-05-02 03:12:38 +0000 | [diff] [blame] | 104 | static PyObject * |
Fred Drake | 45cfbcc | 2000-07-09 06:21:27 +0000 | [diff] [blame] | 105 | range_item(rangeobject *r, int i) |
Guido van Rossum | 12d12c5 | 1993-10-26 17:58:25 +0000 | [diff] [blame] | 106 | { |
Thomas Wouters | efafcea | 2001-07-09 12:30:54 +0000 | [diff] [blame] | 107 | if (i < 0 || i >= r->totlen) |
| 108 | if (r->totlen!=-1) { |
| 109 | PyErr_SetString(PyExc_IndexError, |
Guido van Rossum | 5dadf7e | 1999-01-09 21:40:35 +0000 | [diff] [blame] | 110 | "xrange object index out of range"); |
Thomas Wouters | efafcea | 2001-07-09 12:30:54 +0000 | [diff] [blame] | 111 | return NULL; |
| 112 | } |
Guido van Rossum | 12d12c5 | 1993-10-26 17:58:25 +0000 | [diff] [blame] | 113 | |
Guido van Rossum | c0b618a | 1997-05-02 03:12:38 +0000 | [diff] [blame] | 114 | return PyInt_FromLong(r->start + (i % r->len) * r->step); |
Guido van Rossum | 12d12c5 | 1993-10-26 17:58:25 +0000 | [diff] [blame] | 115 | } |
| 116 | |
| 117 | static int |
Fred Drake | 45cfbcc | 2000-07-09 06:21:27 +0000 | [diff] [blame] | 118 | range_length(rangeobject *r) |
Guido van Rossum | 12d12c5 | 1993-10-26 17:58:25 +0000 | [diff] [blame] | 119 | { |
Thomas Wouters | efafcea | 2001-07-09 12:30:54 +0000 | [diff] [blame] | 120 | if (r->totlen == -1) |
| 121 | PyErr_SetString(PyExc_OverflowError, |
| 122 | "xrange object has too many items"); |
| 123 | return r->totlen; |
Guido van Rossum | 7d6aa51 | 1993-12-21 22:50:31 +0000 | [diff] [blame] | 124 | } |
| 125 | |
Guido van Rossum | c0b618a | 1997-05-02 03:12:38 +0000 | [diff] [blame] | 126 | static PyObject * |
Fred Drake | 45cfbcc | 2000-07-09 06:21:27 +0000 | [diff] [blame] | 127 | range_repr(rangeobject *r) |
Guido van Rossum | 12d12c5 | 1993-10-26 17:58:25 +0000 | [diff] [blame] | 128 | { |
Barry Warsaw | 7ce3694 | 2001-08-24 18:34:26 +0000 | [diff] [blame] | 129 | PyObject *rtn; |
| 130 | |
Tim Peters | 72d421b | 2000-08-04 03:05:40 +0000 | [diff] [blame] | 131 | if (r->start == 0 && r->step == 1) |
Barry Warsaw | 7ce3694 | 2001-08-24 18:34:26 +0000 | [diff] [blame] | 132 | rtn = PyString_FromFormat("xrange(%ld)", |
| 133 | r->start + r->len * r->step); |
Tim Peters | 72d421b | 2000-08-04 03:05:40 +0000 | [diff] [blame] | 134 | |
| 135 | else if (r->step == 1) |
Barry Warsaw | 7ce3694 | 2001-08-24 18:34:26 +0000 | [diff] [blame] | 136 | rtn = PyString_FromFormat("xrange(%ld, %ld)", |
| 137 | r->start, |
| 138 | r->start + r->len * r->step); |
Tim Peters | 72d421b | 2000-08-04 03:05:40 +0000 | [diff] [blame] | 139 | |
| 140 | else |
Barry Warsaw | 7ce3694 | 2001-08-24 18:34:26 +0000 | [diff] [blame] | 141 | rtn = PyString_FromFormat("xrange(%ld, %ld, %ld)", |
| 142 | r->start, |
| 143 | r->start + r->len * r->step, |
| 144 | r->step); |
| 145 | if (r->reps != 1) { |
| 146 | PyObject *extra = PyString_FromFormat( |
| 147 | "(%s * %d)", |
| 148 | PyString_AS_STRING(rtn), r->reps); |
| 149 | Py_DECREF(rtn); |
| 150 | rtn = extra; |
| 151 | } |
| 152 | return rtn; |
Thomas Wouters | efafcea | 2001-07-09 12:30:54 +0000 | [diff] [blame] | 153 | } |
| 154 | |
| 155 | static PyObject * |
| 156 | range_repeat(rangeobject *r, int n) |
| 157 | { |
| 158 | long lreps = 0; |
| 159 | |
| 160 | WARN("xrange object multiplication is deprecated; " |
| 161 | "convert to list instead"); |
| 162 | |
| 163 | if (n <= 0) |
| 164 | return (PyObject *) PyRange_New(0, 0, 1, 1); |
| 165 | |
| 166 | else if (n == 1) { |
| 167 | Py_INCREF(r); |
| 168 | return (PyObject *) r; |
| 169 | } |
| 170 | |
| 171 | else if (! long_mul((long) r->reps, (long) n, &lreps)) |
| 172 | return NULL; |
| 173 | |
| 174 | else |
| 175 | return (PyObject *) PyRange_New( |
| 176 | r->start, |
| 177 | r->len, |
| 178 | r->step, |
| 179 | (int) lreps); |
| 180 | } |
| 181 | |
| 182 | static int |
| 183 | range_compare(rangeobject *r1, rangeobject *r2) |
| 184 | { |
| 185 | |
| 186 | if (PyErr_Warn(PyExc_DeprecationWarning, |
| 187 | "xrange object comparision is deprecated; " |
| 188 | "convert to list instead") < 0) |
| 189 | return -1; |
| 190 | |
| 191 | if (r1->start != r2->start) |
| 192 | return r1->start - r2->start; |
| 193 | |
| 194 | else if (r1->step != r2->step) |
| 195 | return r1->step - r2->step; |
| 196 | |
| 197 | else if (r1->len != r2->len) |
| 198 | return r1->len - r2->len; |
| 199 | |
| 200 | else |
| 201 | return r1->reps - r2->reps; |
| 202 | } |
| 203 | |
| 204 | static PyObject * |
| 205 | range_slice(rangeobject *r, int low, int high) |
| 206 | { |
| 207 | WARN("xrange object slicing is deprecated; " |
| 208 | "convert to list instead"); |
| 209 | |
| 210 | if (r->reps != 1) { |
| 211 | PyErr_SetString(PyExc_TypeError, |
| 212 | "cannot slice a replicated xrange"); |
| 213 | return NULL; |
| 214 | } |
| 215 | if (low < 0) |
| 216 | low = 0; |
| 217 | else if (low > r->len) |
| 218 | low = r->len; |
| 219 | if (high < 0) |
| 220 | high = 0; |
| 221 | if (high < low) |
| 222 | high = low; |
| 223 | else if (high > r->len) |
| 224 | high = r->len; |
| 225 | |
| 226 | if (low == 0 && high == r->len) { |
| 227 | Py_INCREF(r); |
| 228 | return (PyObject *) r; |
| 229 | } |
| 230 | |
| 231 | return (PyObject *) PyRange_New( |
| 232 | low * r->step + r->start, |
| 233 | high - low, |
| 234 | r->step, |
| 235 | 1); |
| 236 | } |
| 237 | |
| 238 | static PyObject * |
| 239 | range_tolist(rangeobject *self, PyObject *args) |
| 240 | { |
| 241 | PyObject *thelist; |
| 242 | int j; |
| 243 | |
| 244 | WARN("xrange.tolist() is deprecated; use list(xrange) instead"); |
| 245 | |
Thomas Wouters | efafcea | 2001-07-09 12:30:54 +0000 | [diff] [blame] | 246 | if (self->totlen == -1) |
| 247 | return PyErr_NoMemory(); |
| 248 | |
| 249 | if ((thelist = PyList_New(self->totlen)) == NULL) |
| 250 | return NULL; |
| 251 | |
| 252 | for (j = 0; j < self->totlen; ++j) |
| 253 | if ((PyList_SetItem(thelist, j, (PyObject *) PyInt_FromLong( |
| 254 | self->start + (j % self->len) * self->step))) < 0) |
| 255 | return NULL; |
| 256 | |
| 257 | return thelist; |
| 258 | } |
| 259 | |
| 260 | static PyObject * |
| 261 | range_getattr(rangeobject *r, char *name) |
| 262 | { |
| 263 | PyObject *result; |
| 264 | |
| 265 | static PyMethodDef range_methods[] = { |
Martin v. Löwis | e3eb1f2 | 2001-08-16 13:15:00 +0000 | [diff] [blame] | 266 | {"tolist", (PyCFunction)range_tolist, METH_NOARGS, |
Thomas Wouters | efafcea | 2001-07-09 12:30:54 +0000 | [diff] [blame] | 267 | "tolist() -> list\n" |
| 268 | "Return a list object with the same values.\n" |
| 269 | "(This method is deprecated; use list() instead.)"}, |
| 270 | {NULL, NULL} |
| 271 | }; |
| 272 | static struct memberlist range_members[] = { |
| 273 | {"step", T_LONG, offsetof(rangeobject, step), RO}, |
| 274 | {"start", T_LONG, offsetof(rangeobject, start), RO}, |
| 275 | {"stop", T_LONG, 0, RO}, |
| 276 | {NULL, 0, 0, 0} |
| 277 | }; |
| 278 | |
| 279 | result = Py_FindMethod(range_methods, (PyObject *) r, name); |
| 280 | if (result == NULL) { |
| 281 | PyErr_Clear(); |
| 282 | if (strcmp("stop", name) == 0) |
| 283 | result = PyInt_FromLong(r->start + (r->len * r->step)); |
| 284 | else |
| 285 | result = PyMember_Get((char *)r, range_members, name); |
| 286 | if (result) |
| 287 | WARN("xrange object's 'start', 'stop' and 'step' " |
| 288 | "attributes are deprecated"); |
| 289 | } |
| 290 | return result; |
Fred Drake | 5678025 | 2000-06-15 14:50:20 +0000 | [diff] [blame] | 291 | } |
| 292 | |
Guido van Rossum | c0b618a | 1997-05-02 03:12:38 +0000 | [diff] [blame] | 293 | static PySequenceMethods range_as_sequence = { |
Fred Drake | 0b796fa | 2000-11-08 19:42:43 +0000 | [diff] [blame] | 294 | (inquiry)range_length, /*sq_length*/ |
Guido van Rossum | 3f56166 | 2001-07-05 13:27:48 +0000 | [diff] [blame] | 295 | 0, /*sq_concat*/ |
Thomas Wouters | efafcea | 2001-07-09 12:30:54 +0000 | [diff] [blame] | 296 | (intargfunc)range_repeat, /*sq_repeat*/ |
| 297 | (intargfunc)range_item, /*sq_item*/ |
| 298 | (intintargfunc)range_slice, /*sq_slice*/ |
Fred Drake | 0b796fa | 2000-11-08 19:42:43 +0000 | [diff] [blame] | 299 | 0, /*sq_ass_item*/ |
| 300 | 0, /*sq_ass_slice*/ |
Thomas Wouters | efafcea | 2001-07-09 12:30:54 +0000 | [diff] [blame] | 301 | 0, /*sq_contains*/ |
Guido van Rossum | 12d12c5 | 1993-10-26 17:58:25 +0000 | [diff] [blame] | 302 | }; |
| 303 | |
Guido van Rossum | c0b618a | 1997-05-02 03:12:38 +0000 | [diff] [blame] | 304 | PyTypeObject PyRange_Type = { |
| 305 | PyObject_HEAD_INIT(&PyType_Type) |
Guido van Rossum | 12d12c5 | 1993-10-26 17:58:25 +0000 | [diff] [blame] | 306 | 0, /* Number of items for varobject */ |
Guido van Rossum | 2586bf0 | 1993-11-01 16:21:44 +0000 | [diff] [blame] | 307 | "xrange", /* Name of this type */ |
Guido van Rossum | 12d12c5 | 1993-10-26 17:58:25 +0000 | [diff] [blame] | 308 | sizeof(rangeobject), /* Basic object size */ |
| 309 | 0, /* Item size for varobject */ |
Tim Peters | 6d6c1a3 | 2001-08-02 04:15:00 +0000 | [diff] [blame] | 310 | (destructor)range_dealloc, /*tp_dealloc*/ |
| 311 | 0, /*tp_print*/ |
| 312 | (getattrfunc)range_getattr, /*tp_getattr*/ |
| 313 | 0, /*tp_setattr*/ |
| 314 | (cmpfunc)range_compare, /*tp_compare*/ |
| 315 | (reprfunc)range_repr, /*tp_repr*/ |
| 316 | 0, /*tp_as_number*/ |
| 317 | &range_as_sequence, /*tp_as_sequence*/ |
| 318 | 0, /*tp_as_mapping*/ |
| 319 | 0, /*tp_hash*/ |
| 320 | 0, /*tp_call*/ |
| 321 | 0, /*tp_str*/ |
| 322 | PyObject_GenericGetAttr, /*tp_getattro*/ |
| 323 | 0, /*tp_setattro*/ |
| 324 | 0, /*tp_as_buffer*/ |
| 325 | Py_TPFLAGS_DEFAULT, /*tp_flags*/ |
| 326 | 0, /* tp_doc */ |
| 327 | 0, /* tp_traverse */ |
| 328 | 0, /* tp_clear */ |
| 329 | 0, /* tp_richcompare */ |
| 330 | 0, /* tp_weaklistoffset */ |
| 331 | 0, /* tp_iter */ |
| 332 | 0, /* tp_iternext */ |
| 333 | 0, /* tp_methods */ |
| 334 | 0, /* tp_members */ |
| 335 | 0, /* tp_getset */ |
| 336 | 0, /* tp_base */ |
| 337 | 0, /* tp_dict */ |
Guido van Rossum | 12d12c5 | 1993-10-26 17:58:25 +0000 | [diff] [blame] | 338 | }; |
Thomas Wouters | efafcea | 2001-07-09 12:30:54 +0000 | [diff] [blame] | 339 | |
| 340 | #undef WARN |