Raymond Hettinger | 756b3f3 | 2004-01-29 06:37:52 +0000 | [diff] [blame] | 1 | #include "Python.h" |
| 2 | |
| 3 | /* collections module implementation of a deque() datatype |
| 4 | Written and maintained by Raymond D. Hettinger <python@rcn.com> |
| 5 | Copyright (c) 2004 Python Software Foundation. |
| 6 | All rights reserved. |
| 7 | */ |
| 8 | |
| 9 | #define BLOCKLEN 46 |
| 10 | |
| 11 | typedef struct BLOCK { |
| 12 | struct BLOCK *leftlink; |
| 13 | struct BLOCK *rightlink; |
| 14 | PyObject *data[BLOCKLEN]; |
| 15 | } block; |
| 16 | |
| 17 | static block *newblock(block *leftlink, block *rightlink) { |
| 18 | block *b = PyMem_Malloc(sizeof(block)); |
| 19 | if (b == NULL) { |
| 20 | PyErr_NoMemory(); |
| 21 | return NULL; |
| 22 | } |
| 23 | b->leftlink = leftlink; |
| 24 | b->rightlink = rightlink; |
| 25 | return b; |
| 26 | } |
| 27 | |
| 28 | typedef struct { |
| 29 | PyObject_HEAD |
| 30 | block *leftblock; |
| 31 | block *rightblock; |
| 32 | int leftindex; |
| 33 | int rightindex; |
| 34 | int len; |
| 35 | } dequeobject; |
| 36 | |
Neal Norwitz | 87f1013 | 2004-02-29 15:40:53 +0000 | [diff] [blame] | 37 | static PyTypeObject deque_type; |
Raymond Hettinger | 738ec90 | 2004-02-29 02:15:56 +0000 | [diff] [blame] | 38 | |
Raymond Hettinger | 756b3f3 | 2004-01-29 06:37:52 +0000 | [diff] [blame] | 39 | static PyObject * |
| 40 | deque_new(PyTypeObject *type, PyObject *args, PyObject *kwds) |
| 41 | { |
| 42 | dequeobject *deque; |
| 43 | block *b; |
| 44 | |
| 45 | /* create dequeobject structure */ |
| 46 | deque = (dequeobject *)type->tp_alloc(type, 0); |
| 47 | if (deque == NULL) |
| 48 | return NULL; |
| 49 | |
| 50 | b = newblock(NULL, NULL); |
| 51 | if (b == NULL) { |
| 52 | Py_DECREF(deque); |
| 53 | return NULL; |
| 54 | } |
| 55 | |
| 56 | deque->leftblock = b; |
| 57 | deque->rightblock = b; |
| 58 | deque->leftindex = BLOCKLEN / 2 + 1; |
| 59 | deque->rightindex = BLOCKLEN / 2; |
| 60 | deque->len = 0; |
| 61 | |
| 62 | return (PyObject *)deque; |
| 63 | } |
| 64 | |
| 65 | static PyObject * |
| 66 | deque_append(dequeobject *deque, PyObject *item) |
| 67 | { |
| 68 | deque->rightindex++; |
| 69 | deque->len++; |
| 70 | if (deque->rightindex == BLOCKLEN) { |
| 71 | block *b = newblock(deque->rightblock, NULL); |
| 72 | if (b == NULL) |
| 73 | return NULL; |
| 74 | assert(deque->rightblock->rightlink == NULL); |
| 75 | deque->rightblock->rightlink = b; |
| 76 | deque->rightblock = b; |
| 77 | deque->rightindex = 0; |
| 78 | } |
| 79 | Py_INCREF(item); |
| 80 | deque->rightblock->data[deque->rightindex] = item; |
| 81 | Py_RETURN_NONE; |
| 82 | } |
| 83 | |
| 84 | PyDoc_STRVAR(append_doc, "Add an element to the right side of the deque."); |
| 85 | |
| 86 | static PyObject * |
| 87 | deque_appendleft(dequeobject *deque, PyObject *item) |
| 88 | { |
| 89 | deque->leftindex--; |
| 90 | deque->len++; |
| 91 | if (deque->leftindex == -1) { |
| 92 | block *b = newblock(NULL, deque->leftblock); |
| 93 | if (b == NULL) |
| 94 | return NULL; |
| 95 | assert(deque->leftblock->leftlink == NULL); |
| 96 | deque->leftblock->leftlink = b; |
| 97 | deque->leftblock = b; |
| 98 | deque->leftindex = BLOCKLEN - 1; |
| 99 | } |
| 100 | Py_INCREF(item); |
| 101 | deque->leftblock->data[deque->leftindex] = item; |
| 102 | Py_RETURN_NONE; |
| 103 | } |
| 104 | |
| 105 | PyDoc_STRVAR(appendleft_doc, "Add an element to the left side of the deque."); |
| 106 | |
| 107 | static PyObject * |
| 108 | deque_pop(dequeobject *deque, PyObject *unused) |
| 109 | { |
| 110 | PyObject *item; |
| 111 | block *prevblock; |
| 112 | |
| 113 | if (deque->len == 0) { |
Raymond Hettinger | 738ec90 | 2004-02-29 02:15:56 +0000 | [diff] [blame] | 114 | PyErr_SetString(PyExc_IndexError, "pop from an empty deque"); |
Raymond Hettinger | 756b3f3 | 2004-01-29 06:37:52 +0000 | [diff] [blame] | 115 | return NULL; |
| 116 | } |
| 117 | item = deque->rightblock->data[deque->rightindex]; |
| 118 | deque->rightindex--; |
| 119 | deque->len--; |
| 120 | |
| 121 | if (deque->rightindex == -1) { |
| 122 | if (deque->len == 0) { |
| 123 | assert(deque->leftblock == deque->rightblock); |
| 124 | assert(deque->leftindex == deque->rightindex+1); |
| 125 | /* re-center instead of freeing a block */ |
| 126 | deque->leftindex = BLOCKLEN / 2 + 1; |
| 127 | deque->rightindex = BLOCKLEN / 2; |
| 128 | } else { |
| 129 | prevblock = deque->rightblock->leftlink; |
| 130 | assert(deque->leftblock != deque->rightblock); |
| 131 | PyMem_Free(deque->rightblock); |
| 132 | prevblock->rightlink = NULL; |
| 133 | deque->rightblock = prevblock; |
| 134 | deque->rightindex = BLOCKLEN - 1; |
| 135 | } |
| 136 | } |
| 137 | return item; |
| 138 | } |
| 139 | |
| 140 | PyDoc_STRVAR(pop_doc, "Remove and return the rightmost element."); |
| 141 | |
| 142 | static PyObject * |
| 143 | deque_popleft(dequeobject *deque, PyObject *unused) |
| 144 | { |
| 145 | PyObject *item; |
| 146 | block *prevblock; |
| 147 | |
| 148 | if (deque->len == 0) { |
Raymond Hettinger | 738ec90 | 2004-02-29 02:15:56 +0000 | [diff] [blame] | 149 | PyErr_SetString(PyExc_IndexError, "pop from an empty deque"); |
Raymond Hettinger | 756b3f3 | 2004-01-29 06:37:52 +0000 | [diff] [blame] | 150 | return NULL; |
| 151 | } |
| 152 | item = deque->leftblock->data[deque->leftindex]; |
| 153 | deque->leftindex++; |
| 154 | deque->len--; |
| 155 | |
| 156 | if (deque->leftindex == BLOCKLEN) { |
| 157 | if (deque->len == 0) { |
| 158 | assert(deque->leftblock == deque->rightblock); |
| 159 | assert(deque->leftindex == deque->rightindex+1); |
| 160 | /* re-center instead of freeing a block */ |
| 161 | deque->leftindex = BLOCKLEN / 2 + 1; |
| 162 | deque->rightindex = BLOCKLEN / 2; |
| 163 | } else { |
| 164 | assert(deque->leftblock != deque->rightblock); |
| 165 | prevblock = deque->leftblock->rightlink; |
| 166 | assert(deque->leftblock != NULL); |
| 167 | PyMem_Free(deque->leftblock); |
| 168 | assert(prevblock != NULL); |
| 169 | prevblock->leftlink = NULL; |
| 170 | deque->leftblock = prevblock; |
| 171 | deque->leftindex = 0; |
| 172 | } |
| 173 | } |
| 174 | return item; |
| 175 | } |
| 176 | |
| 177 | PyDoc_STRVAR(popleft_doc, "Remove and return the leftmost element."); |
| 178 | |
Raymond Hettinger | 3ba85c2 | 2004-02-06 19:04:56 +0000 | [diff] [blame] | 179 | static PyObject * |
| 180 | deque_extend(dequeobject *deque, PyObject *iterable) |
| 181 | { |
| 182 | PyObject *it, *item; |
| 183 | |
| 184 | it = PyObject_GetIter(iterable); |
| 185 | if (it == NULL) |
| 186 | return NULL; |
| 187 | |
| 188 | while ((item = PyIter_Next(it)) != NULL) { |
| 189 | deque->rightindex++; |
| 190 | deque->len++; |
| 191 | if (deque->rightindex == BLOCKLEN) { |
| 192 | block *b = newblock(deque->rightblock, NULL); |
Raymond Hettinger | c058fd1 | 2004-02-07 02:45:22 +0000 | [diff] [blame] | 193 | if (b == NULL) { |
| 194 | Py_DECREF(item); |
| 195 | Py_DECREF(it); |
Raymond Hettinger | 3ba85c2 | 2004-02-06 19:04:56 +0000 | [diff] [blame] | 196 | return NULL; |
Raymond Hettinger | c058fd1 | 2004-02-07 02:45:22 +0000 | [diff] [blame] | 197 | } |
Raymond Hettinger | 3ba85c2 | 2004-02-06 19:04:56 +0000 | [diff] [blame] | 198 | assert(deque->rightblock->rightlink == NULL); |
| 199 | deque->rightblock->rightlink = b; |
| 200 | deque->rightblock = b; |
| 201 | deque->rightindex = 0; |
| 202 | } |
Raymond Hettinger | 3ba85c2 | 2004-02-06 19:04:56 +0000 | [diff] [blame] | 203 | deque->rightblock->data[deque->rightindex] = item; |
| 204 | } |
| 205 | Py_DECREF(it); |
| 206 | if (PyErr_Occurred()) |
| 207 | return NULL; |
| 208 | Py_RETURN_NONE; |
| 209 | } |
| 210 | |
| 211 | PyDoc_STRVAR(extend_doc, |
| 212 | "Extend the right side of the deque with elements from the iterable"); |
| 213 | |
| 214 | static PyObject * |
| 215 | deque_extendleft(dequeobject *deque, PyObject *iterable) |
| 216 | { |
| 217 | PyObject *it, *item; |
| 218 | |
| 219 | it = PyObject_GetIter(iterable); |
| 220 | if (it == NULL) |
| 221 | return NULL; |
| 222 | |
| 223 | while ((item = PyIter_Next(it)) != NULL) { |
| 224 | deque->leftindex--; |
| 225 | deque->len++; |
| 226 | if (deque->leftindex == -1) { |
| 227 | block *b = newblock(NULL, deque->leftblock); |
Raymond Hettinger | c058fd1 | 2004-02-07 02:45:22 +0000 | [diff] [blame] | 228 | if (b == NULL) { |
| 229 | Py_DECREF(item); |
| 230 | Py_DECREF(it); |
Raymond Hettinger | 3ba85c2 | 2004-02-06 19:04:56 +0000 | [diff] [blame] | 231 | return NULL; |
Raymond Hettinger | c058fd1 | 2004-02-07 02:45:22 +0000 | [diff] [blame] | 232 | } |
Raymond Hettinger | 3ba85c2 | 2004-02-06 19:04:56 +0000 | [diff] [blame] | 233 | assert(deque->leftblock->leftlink == NULL); |
| 234 | deque->leftblock->leftlink = b; |
| 235 | deque->leftblock = b; |
| 236 | deque->leftindex = BLOCKLEN - 1; |
| 237 | } |
Raymond Hettinger | 3ba85c2 | 2004-02-06 19:04:56 +0000 | [diff] [blame] | 238 | deque->leftblock->data[deque->leftindex] = item; |
| 239 | } |
| 240 | Py_DECREF(it); |
| 241 | if (PyErr_Occurred()) |
| 242 | return NULL; |
| 243 | Py_RETURN_NONE; |
| 244 | } |
| 245 | |
| 246 | PyDoc_STRVAR(extendleft_doc, |
| 247 | "Extend the left side of the deque with elements from the iterable"); |
| 248 | |
Raymond Hettinger | 5c5eb86 | 2004-02-07 21:13:00 +0000 | [diff] [blame] | 249 | static PyObject * |
| 250 | deque_rotate(dequeobject *deque, PyObject *args) |
| 251 | { |
Raymond Hettinger | ee33b27 | 2004-02-08 04:05:26 +0000 | [diff] [blame] | 252 | int i, n=1, len=deque->len, halflen=(len+1)>>1; |
Raymond Hettinger | 5c5eb86 | 2004-02-07 21:13:00 +0000 | [diff] [blame] | 253 | PyObject *item, *rv; |
| 254 | |
Raymond Hettinger | ee33b27 | 2004-02-08 04:05:26 +0000 | [diff] [blame] | 255 | if (!PyArg_ParseTuple(args, "|i:rotate", &n)) |
Raymond Hettinger | 5c5eb86 | 2004-02-07 21:13:00 +0000 | [diff] [blame] | 256 | return NULL; |
| 257 | |
Raymond Hettinger | ee33b27 | 2004-02-08 04:05:26 +0000 | [diff] [blame] | 258 | if (len == 0) |
Raymond Hettinger | 5c5eb86 | 2004-02-07 21:13:00 +0000 | [diff] [blame] | 259 | Py_RETURN_NONE; |
Raymond Hettinger | ee33b27 | 2004-02-08 04:05:26 +0000 | [diff] [blame] | 260 | if (n > halflen || n < -halflen) { |
| 261 | n %= len; |
| 262 | if (n > halflen) |
| 263 | n -= len; |
| 264 | else if (n < -halflen) |
| 265 | n += len; |
| 266 | } |
Raymond Hettinger | 5c5eb86 | 2004-02-07 21:13:00 +0000 | [diff] [blame] | 267 | |
| 268 | for (i=0 ; i<n ; i++) { |
| 269 | item = deque_pop(deque, NULL); |
| 270 | if (item == NULL) |
| 271 | return NULL; |
| 272 | rv = deque_appendleft(deque, item); |
| 273 | Py_DECREF(item); |
| 274 | if (rv == NULL) |
| 275 | return NULL; |
| 276 | Py_DECREF(rv); |
| 277 | } |
| 278 | for (i=0 ; i>n ; i--) { |
| 279 | item = deque_popleft(deque, NULL); |
| 280 | if (item == NULL) |
| 281 | return NULL; |
| 282 | rv = deque_append(deque, item); |
| 283 | Py_DECREF(item); |
| 284 | if (rv == NULL) |
| 285 | return NULL; |
| 286 | Py_DECREF(rv); |
| 287 | } |
| 288 | Py_RETURN_NONE; |
| 289 | } |
| 290 | |
| 291 | PyDoc_STRVAR(rotate_doc, |
Raymond Hettinger | ee33b27 | 2004-02-08 04:05:26 +0000 | [diff] [blame] | 292 | "Rotate the deque n steps to the right (default n=1). If n is negative, rotates left."); |
Raymond Hettinger | 5c5eb86 | 2004-02-07 21:13:00 +0000 | [diff] [blame] | 293 | |
Raymond Hettinger | 756b3f3 | 2004-01-29 06:37:52 +0000 | [diff] [blame] | 294 | static int |
| 295 | deque_len(dequeobject *deque) |
| 296 | { |
| 297 | return deque->len; |
| 298 | } |
| 299 | |
| 300 | static int |
| 301 | deque_clear(dequeobject *deque) |
| 302 | { |
| 303 | PyObject *item; |
| 304 | |
| 305 | while (deque_len(deque)) { |
| 306 | item = deque_pop(deque, NULL); |
| 307 | if (item == NULL) |
| 308 | return -1; |
| 309 | Py_DECREF(item); |
| 310 | } |
| 311 | assert(deque->leftblock == deque->rightblock && |
| 312 | deque->leftindex > deque->rightindex); |
| 313 | return 0; |
| 314 | } |
| 315 | |
| 316 | static PyObject * |
Raymond Hettinger | 0a4977c | 2004-03-01 23:16:22 +0000 | [diff] [blame] | 317 | deque_item(dequeobject *deque, int i) |
| 318 | { |
| 319 | block *b; |
| 320 | PyObject *item; |
| 321 | int n; |
| 322 | |
| 323 | if (i < 0 || i >= deque->len) { |
| 324 | PyErr_SetString(PyExc_IndexError, |
| 325 | "deque index out of range"); |
| 326 | return NULL; |
| 327 | } |
| 328 | |
Raymond Hettinger | 6c79a51 | 2004-03-04 08:00:54 +0000 | [diff] [blame^] | 329 | if (i == 0) { |
| 330 | i = deque->leftindex; |
Raymond Hettinger | 0a4977c | 2004-03-01 23:16:22 +0000 | [diff] [blame] | 331 | b = deque->leftblock; |
Raymond Hettinger | 6c79a51 | 2004-03-04 08:00:54 +0000 | [diff] [blame^] | 332 | } else if (i == deque->len - 1) { |
| 333 | i = deque->rightindex; |
Raymond Hettinger | 0a4977c | 2004-03-01 23:16:22 +0000 | [diff] [blame] | 334 | b = deque->rightblock; |
Raymond Hettinger | 6c79a51 | 2004-03-04 08:00:54 +0000 | [diff] [blame^] | 335 | } else { |
| 336 | i += deque->leftindex; |
| 337 | n = i / BLOCKLEN; |
| 338 | i %= BLOCKLEN; |
| 339 | if (i < (deque->len >> 1)) { |
| 340 | b = deque->leftblock; |
| 341 | while (n--) |
| 342 | b = b->rightlink; |
| 343 | } else { |
| 344 | n = (deque->leftindex + deque->len - 1) / BLOCKLEN - n; |
| 345 | b = deque->rightblock; |
| 346 | while (n--) |
| 347 | b = b->leftlink; |
| 348 | } |
Raymond Hettinger | 0a4977c | 2004-03-01 23:16:22 +0000 | [diff] [blame] | 349 | } |
| 350 | item = b->data[i]; |
| 351 | Py_INCREF(item); |
| 352 | return item; |
| 353 | } |
| 354 | |
| 355 | static int |
| 356 | deque_ass_item(dequeobject *deque, int i, PyObject *v) |
| 357 | { |
| 358 | PyObject *old_value; |
| 359 | block *b; |
| 360 | int n; |
| 361 | |
| 362 | if (i < 0 || i >= deque->len) { |
| 363 | PyErr_SetString(PyExc_IndexError, |
| 364 | "deque index out of range"); |
| 365 | return -1; |
| 366 | } |
| 367 | i += deque->leftindex; |
| 368 | n = i / BLOCKLEN; |
| 369 | i %= BLOCKLEN; |
| 370 | if (i < (deque->len >> 1)) { |
| 371 | b = deque->leftblock; |
| 372 | while (n--) |
| 373 | b = b->rightlink; |
| 374 | } else { |
| 375 | n = (deque->leftindex + deque->len - 1) / BLOCKLEN - n; |
| 376 | b = deque->rightblock; |
| 377 | while (n--) |
| 378 | b = b->leftlink; |
| 379 | } |
| 380 | Py_INCREF(v); |
| 381 | old_value = b->data[i]; |
| 382 | b->data[i] = v; |
| 383 | Py_DECREF(old_value); |
| 384 | return 0; |
| 385 | } |
| 386 | |
| 387 | static PyObject * |
Raymond Hettinger | 756b3f3 | 2004-01-29 06:37:52 +0000 | [diff] [blame] | 388 | deque_clearmethod(dequeobject *deque) |
| 389 | { |
| 390 | if (deque_clear(deque) == -1) |
| 391 | return NULL; |
| 392 | Py_RETURN_NONE; |
| 393 | } |
| 394 | |
| 395 | PyDoc_STRVAR(clear_doc, "Remove all elements from the deque."); |
| 396 | |
| 397 | static void |
| 398 | deque_dealloc(dequeobject *deque) |
| 399 | { |
| 400 | PyObject_GC_UnTrack(deque); |
| 401 | if (deque->leftblock != NULL) { |
| 402 | int err = deque_clear(deque); |
| 403 | assert(err == 0); |
| 404 | assert(deque->leftblock != NULL); |
| 405 | PyMem_Free(deque->leftblock); |
| 406 | } |
| 407 | deque->leftblock = NULL; |
| 408 | deque->rightblock = NULL; |
| 409 | deque->ob_type->tp_free(deque); |
| 410 | } |
| 411 | |
| 412 | static int |
Raymond Hettinger | 0a4977c | 2004-03-01 23:16:22 +0000 | [diff] [blame] | 413 | deque_traverse(dequeobject *deque, visitproc visit, void *arg) |
Raymond Hettinger | 756b3f3 | 2004-01-29 06:37:52 +0000 | [diff] [blame] | 414 | { |
| 415 | block * b = deque->leftblock; |
| 416 | int index = deque->leftindex; |
| 417 | int err; |
| 418 | PyObject *item; |
| 419 | |
| 420 | while (b != deque->rightblock || index <= deque->rightindex) { |
| 421 | item = b->data[index]; |
| 422 | index++; |
| 423 | if (index == BLOCKLEN && b->rightlink != NULL) { |
| 424 | b = b->rightlink; |
| 425 | index = 0; |
| 426 | } |
| 427 | err = visit(item, arg); |
| 428 | if (err) |
| 429 | return err; |
| 430 | } |
| 431 | return 0; |
| 432 | } |
| 433 | |
| 434 | static long |
| 435 | deque_nohash(PyObject *self) |
| 436 | { |
| 437 | PyErr_SetString(PyExc_TypeError, "deque objects are unhashable"); |
| 438 | return -1; |
| 439 | } |
| 440 | |
| 441 | static PyObject * |
| 442 | deque_copy(PyObject *deque) |
| 443 | { |
| 444 | return PyObject_CallFunctionObjArgs((PyObject *)(deque->ob_type), |
| 445 | deque, NULL); |
| 446 | } |
| 447 | |
| 448 | PyDoc_STRVAR(copy_doc, "Return a shallow copy of a deque."); |
| 449 | |
| 450 | static PyObject * |
| 451 | deque_reduce(dequeobject *deque) |
| 452 | { |
| 453 | PyObject *seq, *args, *result; |
| 454 | |
| 455 | seq = PySequence_Tuple((PyObject *)deque); |
| 456 | if (seq == NULL) |
| 457 | return NULL; |
| 458 | args = PyTuple_Pack(1, seq); |
| 459 | if (args == NULL) { |
| 460 | Py_DECREF(seq); |
| 461 | return NULL; |
| 462 | } |
| 463 | result = PyTuple_Pack(2, deque->ob_type, args); |
| 464 | Py_DECREF(seq); |
| 465 | Py_DECREF(args); |
| 466 | return result; |
| 467 | } |
| 468 | |
| 469 | PyDoc_STRVAR(reduce_doc, "Return state information for pickling."); |
| 470 | |
| 471 | static PyObject * |
| 472 | deque_repr(PyObject *deque) |
| 473 | { |
| 474 | PyObject *aslist, *result, *fmt; |
| 475 | int i; |
| 476 | |
| 477 | i = Py_ReprEnter(deque); |
| 478 | if (i != 0) { |
| 479 | if (i < 0) |
| 480 | return NULL; |
| 481 | return PyString_FromString("[...]"); |
| 482 | } |
| 483 | |
| 484 | aslist = PySequence_List(deque); |
| 485 | if (aslist == NULL) { |
| 486 | Py_ReprLeave(deque); |
| 487 | return NULL; |
| 488 | } |
| 489 | |
| 490 | fmt = PyString_FromString("deque(%r)"); |
| 491 | if (fmt == NULL) { |
| 492 | Py_DECREF(aslist); |
| 493 | Py_ReprLeave(deque); |
| 494 | return NULL; |
| 495 | } |
| 496 | result = PyString_Format(fmt, aslist); |
| 497 | Py_DECREF(fmt); |
| 498 | Py_DECREF(aslist); |
| 499 | Py_ReprLeave(deque); |
| 500 | return result; |
| 501 | } |
| 502 | |
| 503 | static int |
| 504 | deque_tp_print(PyObject *deque, FILE *fp, int flags) |
| 505 | { |
| 506 | PyObject *it, *item; |
Raymond Hettinger | 756b3f3 | 2004-01-29 06:37:52 +0000 | [diff] [blame] | 507 | char *emit = ""; /* No separator emitted on first pass */ |
| 508 | char *separator = ", "; |
| 509 | int i; |
| 510 | |
| 511 | i = Py_ReprEnter(deque); |
| 512 | if (i != 0) { |
| 513 | if (i < 0) |
| 514 | return i; |
| 515 | fputs("[...]", fp); |
| 516 | return 0; |
| 517 | } |
| 518 | |
| 519 | it = PyObject_GetIter(deque); |
| 520 | if (it == NULL) |
| 521 | return -1; |
| 522 | |
| 523 | fputs("deque([", fp); |
| 524 | while ((item = PyIter_Next(it)) != NULL) { |
| 525 | fputs(emit, fp); |
| 526 | emit = separator; |
| 527 | if (PyObject_Print(item, fp, 0) != 0) { |
| 528 | Py_DECREF(item); |
| 529 | Py_DECREF(it); |
| 530 | Py_ReprLeave(deque); |
| 531 | return -1; |
| 532 | } |
| 533 | Py_DECREF(item); |
| 534 | } |
| 535 | Py_ReprLeave(deque); |
| 536 | Py_DECREF(it); |
| 537 | if (PyErr_Occurred()) |
| 538 | return -1; |
| 539 | fputs("])", fp); |
| 540 | return 0; |
| 541 | } |
| 542 | |
Raymond Hettinger | 738ec90 | 2004-02-29 02:15:56 +0000 | [diff] [blame] | 543 | static PyObject * |
| 544 | deque_richcompare(PyObject *v, PyObject *w, int op) |
| 545 | { |
| 546 | PyObject *it1=NULL, *it2=NULL, *x, *y; |
| 547 | int i, b, vs, ws, minlen, cmp=-1; |
| 548 | |
| 549 | if (v->ob_type != &deque_type || w->ob_type != &deque_type) { |
| 550 | Py_INCREF(Py_NotImplemented); |
| 551 | return Py_NotImplemented; |
| 552 | } |
| 553 | |
| 554 | /* Shortcuts */ |
| 555 | vs = ((dequeobject *)v)->len; |
| 556 | ws = ((dequeobject *)w)->len; |
| 557 | if (op == Py_EQ) { |
| 558 | if (v == w) |
| 559 | Py_RETURN_TRUE; |
| 560 | if (vs != ws) |
| 561 | Py_RETURN_FALSE; |
| 562 | } |
| 563 | if (op == Py_NE) { |
| 564 | if (v == w) |
| 565 | Py_RETURN_FALSE; |
| 566 | if (vs != ws) |
| 567 | Py_RETURN_TRUE; |
| 568 | } |
| 569 | |
| 570 | /* Search for the first index where items are different */ |
| 571 | it1 = PyObject_GetIter(v); |
| 572 | if (it1 == NULL) |
| 573 | goto done; |
| 574 | it2 = PyObject_GetIter(w); |
| 575 | if (it2 == NULL) |
| 576 | goto done; |
| 577 | minlen = (vs < ws) ? vs : ws; |
| 578 | for (i=0 ; i < minlen ; i++) { |
| 579 | x = PyIter_Next(it1); |
| 580 | if (x == NULL) |
| 581 | goto done; |
| 582 | y = PyIter_Next(it2); |
| 583 | if (y == NULL) { |
| 584 | Py_DECREF(x); |
| 585 | goto done; |
| 586 | } |
| 587 | b = PyObject_RichCompareBool(x, y, Py_EQ); |
| 588 | if (b == 0) { |
| 589 | cmp = PyObject_RichCompareBool(x, y, op); |
| 590 | Py_DECREF(x); |
| 591 | Py_DECREF(y); |
| 592 | goto done; |
| 593 | } |
| 594 | Py_DECREF(x); |
| 595 | Py_DECREF(y); |
| 596 | if (b == -1) |
| 597 | goto done; |
| 598 | } |
| 599 | /* Elements are equal through minlen. The longest input is the greatest */ |
| 600 | switch (op) { |
| 601 | case Py_LT: cmp = vs < ws; break; |
| 602 | case Py_LE: cmp = vs <= ws; break; |
| 603 | case Py_EQ: cmp = vs == ws; break; |
| 604 | case Py_NE: cmp = vs != ws; break; |
| 605 | case Py_GT: cmp = vs > ws; break; |
| 606 | case Py_GE: cmp = vs >= ws; break; |
| 607 | } |
| 608 | |
| 609 | done: |
| 610 | Py_XDECREF(it1); |
| 611 | Py_XDECREF(it2); |
| 612 | if (cmp == 1) |
| 613 | Py_RETURN_TRUE; |
| 614 | if (cmp == 0) |
| 615 | Py_RETURN_FALSE; |
| 616 | return NULL; |
| 617 | } |
| 618 | |
Raymond Hettinger | 756b3f3 | 2004-01-29 06:37:52 +0000 | [diff] [blame] | 619 | static int |
| 620 | deque_init(dequeobject *deque, PyObject *args, PyObject *kwds) |
| 621 | { |
Raymond Hettinger | 3ba85c2 | 2004-02-06 19:04:56 +0000 | [diff] [blame] | 622 | PyObject *iterable = NULL; |
Raymond Hettinger | 756b3f3 | 2004-01-29 06:37:52 +0000 | [diff] [blame] | 623 | |
| 624 | if (!PyArg_UnpackTuple(args, "deque", 0, 1, &iterable)) |
| 625 | return -1; |
| 626 | |
| 627 | if (iterable != NULL) { |
Raymond Hettinger | 3ba85c2 | 2004-02-06 19:04:56 +0000 | [diff] [blame] | 628 | PyObject *rv = deque_extend(deque, iterable); |
| 629 | if (rv == NULL) |
Raymond Hettinger | 756b3f3 | 2004-01-29 06:37:52 +0000 | [diff] [blame] | 630 | return -1; |
Raymond Hettinger | 3ba85c2 | 2004-02-06 19:04:56 +0000 | [diff] [blame] | 631 | Py_DECREF(rv); |
Raymond Hettinger | 756b3f3 | 2004-01-29 06:37:52 +0000 | [diff] [blame] | 632 | } |
| 633 | return 0; |
| 634 | } |
| 635 | |
| 636 | static PySequenceMethods deque_as_sequence = { |
| 637 | (inquiry)deque_len, /* sq_length */ |
| 638 | 0, /* sq_concat */ |
Raymond Hettinger | 0a4977c | 2004-03-01 23:16:22 +0000 | [diff] [blame] | 639 | 0, /* sq_repeat */ |
| 640 | (intargfunc)deque_item, /* sq_item */ |
| 641 | 0, /* sq_slice */ |
| 642 | (intobjargproc)deque_ass_item, /* sq_ass_item */ |
Raymond Hettinger | 756b3f3 | 2004-01-29 06:37:52 +0000 | [diff] [blame] | 643 | }; |
| 644 | |
| 645 | /* deque object ********************************************************/ |
| 646 | |
| 647 | static PyObject *deque_iter(dequeobject *deque); |
| 648 | |
| 649 | static PyMethodDef deque_methods[] = { |
| 650 | {"append", (PyCFunction)deque_append, |
| 651 | METH_O, append_doc}, |
| 652 | {"appendleft", (PyCFunction)deque_appendleft, |
| 653 | METH_O, appendleft_doc}, |
| 654 | {"clear", (PyCFunction)deque_clearmethod, |
| 655 | METH_NOARGS, clear_doc}, |
| 656 | {"__copy__", (PyCFunction)deque_copy, |
| 657 | METH_NOARGS, copy_doc}, |
Raymond Hettinger | 5c5eb86 | 2004-02-07 21:13:00 +0000 | [diff] [blame] | 658 | {"extend", (PyCFunction)deque_extend, |
| 659 | METH_O, extend_doc}, |
| 660 | {"extendleft", (PyCFunction)deque_extendleft, |
| 661 | METH_O, extendleft_doc}, |
Raymond Hettinger | 756b3f3 | 2004-01-29 06:37:52 +0000 | [diff] [blame] | 662 | {"pop", (PyCFunction)deque_pop, |
| 663 | METH_NOARGS, pop_doc}, |
| 664 | {"popleft", (PyCFunction)deque_popleft, |
| 665 | METH_NOARGS, popleft_doc}, |
| 666 | {"__reduce__", (PyCFunction)deque_reduce, |
| 667 | METH_NOARGS, reduce_doc}, |
Raymond Hettinger | 5c5eb86 | 2004-02-07 21:13:00 +0000 | [diff] [blame] | 668 | {"rotate", (PyCFunction)deque_rotate, |
| 669 | METH_VARARGS, rotate_doc}, |
Raymond Hettinger | 756b3f3 | 2004-01-29 06:37:52 +0000 | [diff] [blame] | 670 | {NULL, NULL} /* sentinel */ |
| 671 | }; |
| 672 | |
| 673 | PyDoc_STRVAR(deque_doc, |
| 674 | "deque(iterable) --> deque object\n\ |
| 675 | \n\ |
| 676 | Build an ordered collection accessible from endpoints only."); |
| 677 | |
Neal Norwitz | 87f1013 | 2004-02-29 15:40:53 +0000 | [diff] [blame] | 678 | static PyTypeObject deque_type = { |
Raymond Hettinger | 756b3f3 | 2004-01-29 06:37:52 +0000 | [diff] [blame] | 679 | PyObject_HEAD_INIT(NULL) |
| 680 | 0, /* ob_size */ |
| 681 | "collections.deque", /* tp_name */ |
| 682 | sizeof(dequeobject), /* tp_basicsize */ |
| 683 | 0, /* tp_itemsize */ |
| 684 | /* methods */ |
| 685 | (destructor)deque_dealloc, /* tp_dealloc */ |
| 686 | (printfunc)deque_tp_print, /* tp_print */ |
| 687 | 0, /* tp_getattr */ |
| 688 | 0, /* tp_setattr */ |
| 689 | 0, /* tp_compare */ |
| 690 | (reprfunc)deque_repr, /* tp_repr */ |
| 691 | 0, /* tp_as_number */ |
| 692 | &deque_as_sequence, /* tp_as_sequence */ |
| 693 | 0, /* tp_as_mapping */ |
| 694 | deque_nohash, /* tp_hash */ |
| 695 | 0, /* tp_call */ |
| 696 | 0, /* tp_str */ |
| 697 | PyObject_GenericGetAttr, /* tp_getattro */ |
| 698 | 0, /* tp_setattro */ |
| 699 | 0, /* tp_as_buffer */ |
| 700 | Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE | Py_TPFLAGS_HAVE_GC, /* tp_flags */ |
| 701 | deque_doc, /* tp_doc */ |
Raymond Hettinger | 0a4977c | 2004-03-01 23:16:22 +0000 | [diff] [blame] | 702 | (traverseproc)deque_traverse, /* tp_traverse */ |
Raymond Hettinger | 756b3f3 | 2004-01-29 06:37:52 +0000 | [diff] [blame] | 703 | (inquiry)deque_clear, /* tp_clear */ |
Raymond Hettinger | 738ec90 | 2004-02-29 02:15:56 +0000 | [diff] [blame] | 704 | (richcmpfunc)deque_richcompare, /* tp_richcompare */ |
Raymond Hettinger | 756b3f3 | 2004-01-29 06:37:52 +0000 | [diff] [blame] | 705 | 0, /* tp_weaklistoffset*/ |
| 706 | (getiterfunc)deque_iter, /* tp_iter */ |
| 707 | 0, /* tp_iternext */ |
| 708 | deque_methods, /* tp_methods */ |
| 709 | 0, /* tp_members */ |
| 710 | 0, /* tp_getset */ |
| 711 | 0, /* tp_base */ |
| 712 | 0, /* tp_dict */ |
| 713 | 0, /* tp_descr_get */ |
| 714 | 0, /* tp_descr_set */ |
| 715 | 0, /* tp_dictoffset */ |
| 716 | (initproc)deque_init, /* tp_init */ |
| 717 | PyType_GenericAlloc, /* tp_alloc */ |
| 718 | deque_new, /* tp_new */ |
| 719 | PyObject_GC_Del, /* tp_free */ |
| 720 | }; |
| 721 | |
| 722 | /*********************** Deque Iterator **************************/ |
| 723 | |
| 724 | typedef struct { |
| 725 | PyObject_HEAD |
| 726 | int index; |
| 727 | block *b; |
| 728 | dequeobject *deque; |
| 729 | int len; |
| 730 | } dequeiterobject; |
| 731 | |
| 732 | PyTypeObject dequeiter_type; |
| 733 | |
| 734 | static PyObject * |
| 735 | deque_iter(dequeobject *deque) |
| 736 | { |
| 737 | dequeiterobject *it; |
| 738 | |
| 739 | it = PyObject_New(dequeiterobject, &dequeiter_type); |
| 740 | if (it == NULL) |
| 741 | return NULL; |
| 742 | it->b = deque->leftblock; |
| 743 | it->index = deque->leftindex; |
| 744 | Py_INCREF(deque); |
| 745 | it->deque = deque; |
| 746 | it->len = deque->len; |
| 747 | return (PyObject *)it; |
| 748 | } |
| 749 | |
| 750 | static void |
| 751 | dequeiter_dealloc(dequeiterobject *dio) |
| 752 | { |
| 753 | Py_XDECREF(dio->deque); |
| 754 | dio->ob_type->tp_free(dio); |
| 755 | } |
| 756 | |
| 757 | static PyObject * |
| 758 | dequeiter_next(dequeiterobject *it) |
| 759 | { |
| 760 | PyObject *item; |
| 761 | if (it->b == it->deque->rightblock && it->index > it->deque->rightindex) |
| 762 | return NULL; |
| 763 | |
| 764 | if (it->len != it->deque->len) { |
| 765 | it->len = -1; /* Make this state sticky */ |
| 766 | PyErr_SetString(PyExc_RuntimeError, |
| 767 | "deque changed size during iteration"); |
| 768 | return NULL; |
| 769 | } |
| 770 | |
| 771 | item = it->b->data[it->index]; |
| 772 | it->index++; |
| 773 | if (it->index == BLOCKLEN && it->b->rightlink != NULL) { |
| 774 | it->b = it->b->rightlink; |
| 775 | it->index = 0; |
| 776 | } |
| 777 | Py_INCREF(item); |
| 778 | return item; |
| 779 | } |
| 780 | |
| 781 | PyTypeObject dequeiter_type = { |
| 782 | PyObject_HEAD_INIT(NULL) |
| 783 | 0, /* ob_size */ |
| 784 | "deque_iterator", /* tp_name */ |
| 785 | sizeof(dequeiterobject), /* tp_basicsize */ |
| 786 | 0, /* tp_itemsize */ |
| 787 | /* methods */ |
| 788 | (destructor)dequeiter_dealloc, /* tp_dealloc */ |
| 789 | 0, /* tp_print */ |
| 790 | 0, /* tp_getattr */ |
| 791 | 0, /* tp_setattr */ |
| 792 | 0, /* tp_compare */ |
| 793 | 0, /* tp_repr */ |
| 794 | 0, /* tp_as_number */ |
| 795 | 0, /* tp_as_sequence */ |
| 796 | 0, /* tp_as_mapping */ |
| 797 | 0, /* tp_hash */ |
| 798 | 0, /* tp_call */ |
| 799 | 0, /* tp_str */ |
| 800 | PyObject_GenericGetAttr, /* tp_getattro */ |
| 801 | 0, /* tp_setattro */ |
| 802 | 0, /* tp_as_buffer */ |
| 803 | Py_TPFLAGS_DEFAULT, /* tp_flags */ |
| 804 | 0, /* tp_doc */ |
| 805 | 0, /* tp_traverse */ |
| 806 | 0, /* tp_clear */ |
| 807 | 0, /* tp_richcompare */ |
| 808 | 0, /* tp_weaklistoffset */ |
| 809 | PyObject_SelfIter, /* tp_iter */ |
| 810 | (iternextfunc)dequeiter_next, /* tp_iternext */ |
| 811 | 0, |
| 812 | }; |
| 813 | |
| 814 | /* module level code ********************************************************/ |
| 815 | |
| 816 | PyDoc_STRVAR(module_doc, |
| 817 | "High performance data structures\n\ |
| 818 | "); |
| 819 | |
| 820 | PyMODINIT_FUNC |
| 821 | initcollections(void) |
| 822 | { |
| 823 | PyObject *m; |
| 824 | |
| 825 | m = Py_InitModule3("collections", NULL, module_doc); |
| 826 | |
| 827 | if (PyType_Ready(&deque_type) < 0) |
| 828 | return; |
| 829 | Py_INCREF(&deque_type); |
| 830 | PyModule_AddObject(m, "deque", (PyObject *)&deque_type); |
| 831 | |
| 832 | if (PyType_Ready(&dequeiter_type) < 0) |
| 833 | return; |
| 834 | |
Raymond Hettinger | 756b3f3 | 2004-01-29 06:37:52 +0000 | [diff] [blame] | 835 | return; |
| 836 | } |