Raymond Hettinger | 756b3f3 | 2004-01-29 06:37:52 +0000 | [diff] [blame] | 1 | #include "Python.h" |
Raymond Hettinger | 691d805 | 2004-05-30 07:26:47 +0000 | [diff] [blame] | 2 | #include "structmember.h" |
Raymond Hettinger | 756b3f3 | 2004-01-29 06:37:52 +0000 | [diff] [blame] | 3 | |
| 4 | /* collections module implementation of a deque() datatype |
| 5 | Written and maintained by Raymond D. Hettinger <python@rcn.com> |
| 6 | Copyright (c) 2004 Python Software Foundation. |
| 7 | All rights reserved. |
| 8 | */ |
| 9 | |
Raymond Hettinger | 77e8bf1 | 2004-10-01 15:25:53 +0000 | [diff] [blame] | 10 | /* The block length may be set to any number over 1. Larger numbers |
| 11 | * reduce the number of calls to the memory allocator but take more |
| 12 | * memory. Ideally, BLOCKLEN should be set with an eye to the |
| 13 | * length of a cache line. |
| 14 | */ |
| 15 | |
Raymond Hettinger | 7d112df | 2004-11-02 02:11:35 +0000 | [diff] [blame] | 16 | #define BLOCKLEN 62 |
Raymond Hettinger | 61f05fb | 2004-10-01 06:24:12 +0000 | [diff] [blame] | 17 | #define CENTER ((BLOCKLEN - 1) / 2) |
Raymond Hettinger | 756b3f3 | 2004-01-29 06:37:52 +0000 | [diff] [blame] | 18 | |
Tim Peters | d8768d3 | 2004-10-01 01:32:53 +0000 | [diff] [blame] | 19 | /* A `dequeobject` is composed of a doubly-linked list of `block` nodes. |
| 20 | * This list is not circular (the leftmost block has leftlink==NULL, |
| 21 | * and the rightmost block has rightlink==NULL). A deque d's first |
| 22 | * element is at d.leftblock[leftindex] and its last element is at |
| 23 | * d.rightblock[rightindex]; note that, unlike as for Python slice |
Raymond Hettinger | 61f05fb | 2004-10-01 06:24:12 +0000 | [diff] [blame] | 24 | * indices, these indices are inclusive on both ends. By being inclusive |
| 25 | * on both ends, algorithms for left and right operations become |
| 26 | * symmetrical which simplifies the design. |
| 27 | * |
| 28 | * The list of blocks is never empty, so d.leftblock and d.rightblock |
| 29 | * are never equal to NULL. |
| 30 | * |
| 31 | * The indices, d.leftindex and d.rightindex are always in the range |
| 32 | * 0 <= index < BLOCKLEN. |
Raymond Hettinger | 4ca4c7c | 2004-10-01 15:14:39 +0000 | [diff] [blame] | 33 | * Their exact relationship is: |
| 34 | * (d.leftindex + d.len - 1) % BLOCKLEN == d.rightindex. |
Raymond Hettinger | 61f05fb | 2004-10-01 06:24:12 +0000 | [diff] [blame] | 35 | * |
| 36 | * Empty deques have d.len == 0; d.leftblock==d.rightblock; |
| 37 | * d.leftindex == CENTER+1; and d.rightindex == CENTER. |
| 38 | * Checking for d.len == 0 is the intended way to see whether d is empty. |
| 39 | * |
| 40 | * Whenever d.leftblock == d.rightblock, |
Raymond Hettinger | 4ca4c7c | 2004-10-01 15:14:39 +0000 | [diff] [blame] | 41 | * d.leftindex + d.len - 1 == d.rightindex. |
Raymond Hettinger | 61f05fb | 2004-10-01 06:24:12 +0000 | [diff] [blame] | 42 | * |
Raymond Hettinger | 4ca4c7c | 2004-10-01 15:14:39 +0000 | [diff] [blame] | 43 | * However, when d.leftblock != d.rightblock, d.leftindex and d.rightindex |
| 44 | * become indices into distinct blocks and either may be larger than the |
| 45 | * other. |
Tim Peters | d8768d3 | 2004-10-01 01:32:53 +0000 | [diff] [blame] | 46 | */ |
| 47 | |
Raymond Hettinger | 756b3f3 | 2004-01-29 06:37:52 +0000 | [diff] [blame] | 48 | typedef struct BLOCK { |
| 49 | struct BLOCK *leftlink; |
| 50 | struct BLOCK *rightlink; |
| 51 | PyObject *data[BLOCKLEN]; |
| 52 | } block; |
| 53 | |
Tim Peters | 6f85356 | 2004-10-01 01:04:50 +0000 | [diff] [blame] | 54 | static block * |
Raymond Hettinger | c5fa992 | 2004-10-06 17:51:54 +0000 | [diff] [blame] | 55 | newblock(block *leftlink, block *rightlink, int len) { |
| 56 | block *b; |
| 57 | /* To prevent len from overflowing INT_MAX on 64-bit machines, we |
| 58 | * refuse to allocate new blocks if the current len is dangerously |
| 59 | * close. There is some extra margin to prevent spurious arithmetic |
| 60 | * overflows at various places. The following check ensures that |
| 61 | * the blocks allocated to the deque, in the worst case, can only |
| 62 | * have INT_MAX-2 entries in total. |
| 63 | */ |
| 64 | if (len >= INT_MAX - 2*BLOCKLEN) { |
| 65 | PyErr_SetString(PyExc_OverflowError, |
| 66 | "cannot add more blocks to the deque"); |
| 67 | return NULL; |
| 68 | } |
| 69 | b = PyMem_Malloc(sizeof(block)); |
Raymond Hettinger | 756b3f3 | 2004-01-29 06:37:52 +0000 | [diff] [blame] | 70 | if (b == NULL) { |
| 71 | PyErr_NoMemory(); |
| 72 | return NULL; |
| 73 | } |
| 74 | b->leftlink = leftlink; |
| 75 | b->rightlink = rightlink; |
| 76 | return b; |
| 77 | } |
| 78 | |
| 79 | typedef struct { |
| 80 | PyObject_HEAD |
| 81 | block *leftblock; |
| 82 | block *rightblock; |
Tim Peters | d8768d3 | 2004-10-01 01:32:53 +0000 | [diff] [blame] | 83 | int leftindex; /* in range(BLOCKLEN) */ |
| 84 | int rightindex; /* in range(BLOCKLEN) */ |
Raymond Hettinger | 756b3f3 | 2004-01-29 06:37:52 +0000 | [diff] [blame] | 85 | int len; |
Raymond Hettinger | d1b3d88 | 2004-10-02 00:43:13 +0000 | [diff] [blame] | 86 | long state; /* incremented whenever the indices move */ |
Raymond Hettinger | 691d805 | 2004-05-30 07:26:47 +0000 | [diff] [blame] | 87 | PyObject *weakreflist; /* List of weak references */ |
Raymond Hettinger | 756b3f3 | 2004-01-29 06:37:52 +0000 | [diff] [blame] | 88 | } dequeobject; |
| 89 | |
Neal Norwitz | 87f1013 | 2004-02-29 15:40:53 +0000 | [diff] [blame] | 90 | static PyTypeObject deque_type; |
Raymond Hettinger | 738ec90 | 2004-02-29 02:15:56 +0000 | [diff] [blame] | 91 | |
Raymond Hettinger | 756b3f3 | 2004-01-29 06:37:52 +0000 | [diff] [blame] | 92 | static PyObject * |
| 93 | deque_new(PyTypeObject *type, PyObject *args, PyObject *kwds) |
| 94 | { |
| 95 | dequeobject *deque; |
| 96 | block *b; |
| 97 | |
Georg Brandl | 02c4287 | 2005-08-26 06:42:30 +0000 | [diff] [blame] | 98 | if (!_PyArg_NoKeywords("deque()", kwds)) |
| 99 | return NULL; |
| 100 | |
Raymond Hettinger | 756b3f3 | 2004-01-29 06:37:52 +0000 | [diff] [blame] | 101 | /* create dequeobject structure */ |
| 102 | deque = (dequeobject *)type->tp_alloc(type, 0); |
| 103 | if (deque == NULL) |
| 104 | return NULL; |
Tim Peters | 1065f75 | 2004-10-01 01:03:29 +0000 | [diff] [blame] | 105 | |
Raymond Hettinger | c5fa992 | 2004-10-06 17:51:54 +0000 | [diff] [blame] | 106 | b = newblock(NULL, NULL, 0); |
Raymond Hettinger | 756b3f3 | 2004-01-29 06:37:52 +0000 | [diff] [blame] | 107 | if (b == NULL) { |
| 108 | Py_DECREF(deque); |
| 109 | return NULL; |
| 110 | } |
| 111 | |
Raymond Hettinger | 61f05fb | 2004-10-01 06:24:12 +0000 | [diff] [blame] | 112 | assert(BLOCKLEN >= 2); |
Raymond Hettinger | 756b3f3 | 2004-01-29 06:37:52 +0000 | [diff] [blame] | 113 | deque->leftblock = b; |
| 114 | deque->rightblock = b; |
Raymond Hettinger | 61f05fb | 2004-10-01 06:24:12 +0000 | [diff] [blame] | 115 | deque->leftindex = CENTER + 1; |
| 116 | deque->rightindex = CENTER; |
Raymond Hettinger | 756b3f3 | 2004-01-29 06:37:52 +0000 | [diff] [blame] | 117 | deque->len = 0; |
Raymond Hettinger | d1b3d88 | 2004-10-02 00:43:13 +0000 | [diff] [blame] | 118 | deque->state = 0; |
Raymond Hettinger | 691d805 | 2004-05-30 07:26:47 +0000 | [diff] [blame] | 119 | deque->weakreflist = NULL; |
Raymond Hettinger | 756b3f3 | 2004-01-29 06:37:52 +0000 | [diff] [blame] | 120 | |
| 121 | return (PyObject *)deque; |
| 122 | } |
| 123 | |
| 124 | static PyObject * |
| 125 | deque_append(dequeobject *deque, PyObject *item) |
| 126 | { |
Raymond Hettinger | d1b3d88 | 2004-10-02 00:43:13 +0000 | [diff] [blame] | 127 | deque->state++; |
Armin Rigo | 974d757 | 2004-10-02 13:59:34 +0000 | [diff] [blame] | 128 | if (deque->rightindex == BLOCKLEN-1) { |
Raymond Hettinger | c5fa992 | 2004-10-06 17:51:54 +0000 | [diff] [blame] | 129 | block *b = newblock(deque->rightblock, NULL, deque->len); |
Raymond Hettinger | 756b3f3 | 2004-01-29 06:37:52 +0000 | [diff] [blame] | 130 | if (b == NULL) |
| 131 | return NULL; |
| 132 | assert(deque->rightblock->rightlink == NULL); |
| 133 | deque->rightblock->rightlink = b; |
| 134 | deque->rightblock = b; |
Armin Rigo | 974d757 | 2004-10-02 13:59:34 +0000 | [diff] [blame] | 135 | deque->rightindex = -1; |
Raymond Hettinger | 756b3f3 | 2004-01-29 06:37:52 +0000 | [diff] [blame] | 136 | } |
| 137 | Py_INCREF(item); |
Armin Rigo | 974d757 | 2004-10-02 13:59:34 +0000 | [diff] [blame] | 138 | deque->len++; |
| 139 | deque->rightindex++; |
Raymond Hettinger | 756b3f3 | 2004-01-29 06:37:52 +0000 | [diff] [blame] | 140 | deque->rightblock->data[deque->rightindex] = item; |
| 141 | Py_RETURN_NONE; |
| 142 | } |
| 143 | |
| 144 | PyDoc_STRVAR(append_doc, "Add an element to the right side of the deque."); |
| 145 | |
| 146 | static PyObject * |
| 147 | deque_appendleft(dequeobject *deque, PyObject *item) |
| 148 | { |
Raymond Hettinger | d1b3d88 | 2004-10-02 00:43:13 +0000 | [diff] [blame] | 149 | deque->state++; |
Armin Rigo | 974d757 | 2004-10-02 13:59:34 +0000 | [diff] [blame] | 150 | if (deque->leftindex == 0) { |
Raymond Hettinger | c5fa992 | 2004-10-06 17:51:54 +0000 | [diff] [blame] | 151 | block *b = newblock(NULL, deque->leftblock, deque->len); |
Raymond Hettinger | 756b3f3 | 2004-01-29 06:37:52 +0000 | [diff] [blame] | 152 | if (b == NULL) |
| 153 | return NULL; |
| 154 | assert(deque->leftblock->leftlink == NULL); |
| 155 | deque->leftblock->leftlink = b; |
| 156 | deque->leftblock = b; |
Armin Rigo | 974d757 | 2004-10-02 13:59:34 +0000 | [diff] [blame] | 157 | deque->leftindex = BLOCKLEN; |
Raymond Hettinger | 756b3f3 | 2004-01-29 06:37:52 +0000 | [diff] [blame] | 158 | } |
| 159 | Py_INCREF(item); |
Armin Rigo | 974d757 | 2004-10-02 13:59:34 +0000 | [diff] [blame] | 160 | deque->len++; |
| 161 | deque->leftindex--; |
Raymond Hettinger | 756b3f3 | 2004-01-29 06:37:52 +0000 | [diff] [blame] | 162 | deque->leftblock->data[deque->leftindex] = item; |
| 163 | Py_RETURN_NONE; |
| 164 | } |
| 165 | |
| 166 | PyDoc_STRVAR(appendleft_doc, "Add an element to the left side of the deque."); |
| 167 | |
| 168 | static PyObject * |
| 169 | deque_pop(dequeobject *deque, PyObject *unused) |
| 170 | { |
| 171 | PyObject *item; |
| 172 | block *prevblock; |
| 173 | |
| 174 | if (deque->len == 0) { |
Raymond Hettinger | 738ec90 | 2004-02-29 02:15:56 +0000 | [diff] [blame] | 175 | PyErr_SetString(PyExc_IndexError, "pop from an empty deque"); |
Raymond Hettinger | 756b3f3 | 2004-01-29 06:37:52 +0000 | [diff] [blame] | 176 | return NULL; |
| 177 | } |
| 178 | item = deque->rightblock->data[deque->rightindex]; |
| 179 | deque->rightindex--; |
| 180 | deque->len--; |
Raymond Hettinger | d1b3d88 | 2004-10-02 00:43:13 +0000 | [diff] [blame] | 181 | deque->state++; |
Raymond Hettinger | 756b3f3 | 2004-01-29 06:37:52 +0000 | [diff] [blame] | 182 | |
| 183 | if (deque->rightindex == -1) { |
| 184 | if (deque->len == 0) { |
| 185 | assert(deque->leftblock == deque->rightblock); |
| 186 | assert(deque->leftindex == deque->rightindex+1); |
| 187 | /* re-center instead of freeing a block */ |
Raymond Hettinger | 61f05fb | 2004-10-01 06:24:12 +0000 | [diff] [blame] | 188 | deque->leftindex = CENTER + 1; |
| 189 | deque->rightindex = CENTER; |
Raymond Hettinger | 756b3f3 | 2004-01-29 06:37:52 +0000 | [diff] [blame] | 190 | } else { |
| 191 | prevblock = deque->rightblock->leftlink; |
| 192 | assert(deque->leftblock != deque->rightblock); |
| 193 | PyMem_Free(deque->rightblock); |
| 194 | prevblock->rightlink = NULL; |
| 195 | deque->rightblock = prevblock; |
| 196 | deque->rightindex = BLOCKLEN - 1; |
| 197 | } |
| 198 | } |
| 199 | return item; |
| 200 | } |
| 201 | |
| 202 | PyDoc_STRVAR(pop_doc, "Remove and return the rightmost element."); |
| 203 | |
| 204 | static PyObject * |
| 205 | deque_popleft(dequeobject *deque, PyObject *unused) |
| 206 | { |
| 207 | PyObject *item; |
| 208 | block *prevblock; |
| 209 | |
| 210 | if (deque->len == 0) { |
Raymond Hettinger | 738ec90 | 2004-02-29 02:15:56 +0000 | [diff] [blame] | 211 | PyErr_SetString(PyExc_IndexError, "pop from an empty deque"); |
Raymond Hettinger | 756b3f3 | 2004-01-29 06:37:52 +0000 | [diff] [blame] | 212 | return NULL; |
| 213 | } |
| 214 | item = deque->leftblock->data[deque->leftindex]; |
| 215 | deque->leftindex++; |
| 216 | deque->len--; |
Raymond Hettinger | d1b3d88 | 2004-10-02 00:43:13 +0000 | [diff] [blame] | 217 | deque->state++; |
Raymond Hettinger | 756b3f3 | 2004-01-29 06:37:52 +0000 | [diff] [blame] | 218 | |
| 219 | if (deque->leftindex == BLOCKLEN) { |
| 220 | if (deque->len == 0) { |
| 221 | assert(deque->leftblock == deque->rightblock); |
| 222 | assert(deque->leftindex == deque->rightindex+1); |
| 223 | /* re-center instead of freeing a block */ |
Raymond Hettinger | 61f05fb | 2004-10-01 06:24:12 +0000 | [diff] [blame] | 224 | deque->leftindex = CENTER + 1; |
| 225 | deque->rightindex = CENTER; |
Raymond Hettinger | 756b3f3 | 2004-01-29 06:37:52 +0000 | [diff] [blame] | 226 | } else { |
| 227 | assert(deque->leftblock != deque->rightblock); |
| 228 | prevblock = deque->leftblock->rightlink; |
| 229 | assert(deque->leftblock != NULL); |
| 230 | PyMem_Free(deque->leftblock); |
| 231 | assert(prevblock != NULL); |
| 232 | prevblock->leftlink = NULL; |
| 233 | deque->leftblock = prevblock; |
| 234 | deque->leftindex = 0; |
| 235 | } |
| 236 | } |
| 237 | return item; |
| 238 | } |
| 239 | |
| 240 | PyDoc_STRVAR(popleft_doc, "Remove and return the leftmost element."); |
| 241 | |
Raymond Hettinger | 3ba85c2 | 2004-02-06 19:04:56 +0000 | [diff] [blame] | 242 | static PyObject * |
| 243 | deque_extend(dequeobject *deque, PyObject *iterable) |
| 244 | { |
| 245 | PyObject *it, *item; |
| 246 | |
| 247 | it = PyObject_GetIter(iterable); |
| 248 | if (it == NULL) |
| 249 | return NULL; |
| 250 | |
| 251 | while ((item = PyIter_Next(it)) != NULL) { |
Raymond Hettinger | d1b3d88 | 2004-10-02 00:43:13 +0000 | [diff] [blame] | 252 | deque->state++; |
Armin Rigo | 974d757 | 2004-10-02 13:59:34 +0000 | [diff] [blame] | 253 | if (deque->rightindex == BLOCKLEN-1) { |
Raymond Hettinger | c5fa992 | 2004-10-06 17:51:54 +0000 | [diff] [blame] | 254 | block *b = newblock(deque->rightblock, NULL, |
| 255 | deque->len); |
Raymond Hettinger | c058fd1 | 2004-02-07 02:45:22 +0000 | [diff] [blame] | 256 | if (b == NULL) { |
| 257 | Py_DECREF(item); |
| 258 | Py_DECREF(it); |
Raymond Hettinger | 3ba85c2 | 2004-02-06 19:04:56 +0000 | [diff] [blame] | 259 | return NULL; |
Raymond Hettinger | c058fd1 | 2004-02-07 02:45:22 +0000 | [diff] [blame] | 260 | } |
Raymond Hettinger | 3ba85c2 | 2004-02-06 19:04:56 +0000 | [diff] [blame] | 261 | assert(deque->rightblock->rightlink == NULL); |
| 262 | deque->rightblock->rightlink = b; |
| 263 | deque->rightblock = b; |
Armin Rigo | 974d757 | 2004-10-02 13:59:34 +0000 | [diff] [blame] | 264 | deque->rightindex = -1; |
Raymond Hettinger | 3ba85c2 | 2004-02-06 19:04:56 +0000 | [diff] [blame] | 265 | } |
Armin Rigo | 974d757 | 2004-10-02 13:59:34 +0000 | [diff] [blame] | 266 | deque->len++; |
| 267 | deque->rightindex++; |
Raymond Hettinger | 3ba85c2 | 2004-02-06 19:04:56 +0000 | [diff] [blame] | 268 | deque->rightblock->data[deque->rightindex] = item; |
| 269 | } |
| 270 | Py_DECREF(it); |
Tim Peters | 1065f75 | 2004-10-01 01:03:29 +0000 | [diff] [blame] | 271 | if (PyErr_Occurred()) |
Raymond Hettinger | 3ba85c2 | 2004-02-06 19:04:56 +0000 | [diff] [blame] | 272 | return NULL; |
| 273 | Py_RETURN_NONE; |
| 274 | } |
| 275 | |
Tim Peters | 1065f75 | 2004-10-01 01:03:29 +0000 | [diff] [blame] | 276 | PyDoc_STRVAR(extend_doc, |
Raymond Hettinger | 3ba85c2 | 2004-02-06 19:04:56 +0000 | [diff] [blame] | 277 | "Extend the right side of the deque with elements from the iterable"); |
| 278 | |
| 279 | static PyObject * |
| 280 | deque_extendleft(dequeobject *deque, PyObject *iterable) |
| 281 | { |
| 282 | PyObject *it, *item; |
| 283 | |
| 284 | it = PyObject_GetIter(iterable); |
| 285 | if (it == NULL) |
| 286 | return NULL; |
| 287 | |
| 288 | while ((item = PyIter_Next(it)) != NULL) { |
Raymond Hettinger | d1b3d88 | 2004-10-02 00:43:13 +0000 | [diff] [blame] | 289 | deque->state++; |
Armin Rigo | 974d757 | 2004-10-02 13:59:34 +0000 | [diff] [blame] | 290 | if (deque->leftindex == 0) { |
Raymond Hettinger | c5fa992 | 2004-10-06 17:51:54 +0000 | [diff] [blame] | 291 | block *b = newblock(NULL, deque->leftblock, |
| 292 | deque->len); |
Raymond Hettinger | c058fd1 | 2004-02-07 02:45:22 +0000 | [diff] [blame] | 293 | if (b == NULL) { |
| 294 | Py_DECREF(item); |
| 295 | Py_DECREF(it); |
Raymond Hettinger | 3ba85c2 | 2004-02-06 19:04:56 +0000 | [diff] [blame] | 296 | return NULL; |
Raymond Hettinger | c058fd1 | 2004-02-07 02:45:22 +0000 | [diff] [blame] | 297 | } |
Raymond Hettinger | 3ba85c2 | 2004-02-06 19:04:56 +0000 | [diff] [blame] | 298 | assert(deque->leftblock->leftlink == NULL); |
| 299 | deque->leftblock->leftlink = b; |
| 300 | deque->leftblock = b; |
Armin Rigo | 974d757 | 2004-10-02 13:59:34 +0000 | [diff] [blame] | 301 | deque->leftindex = BLOCKLEN; |
Raymond Hettinger | 3ba85c2 | 2004-02-06 19:04:56 +0000 | [diff] [blame] | 302 | } |
Armin Rigo | 974d757 | 2004-10-02 13:59:34 +0000 | [diff] [blame] | 303 | deque->len++; |
| 304 | deque->leftindex--; |
Raymond Hettinger | 3ba85c2 | 2004-02-06 19:04:56 +0000 | [diff] [blame] | 305 | deque->leftblock->data[deque->leftindex] = item; |
| 306 | } |
| 307 | Py_DECREF(it); |
Raymond Hettinger | a435c53 | 2004-07-09 04:10:20 +0000 | [diff] [blame] | 308 | if (PyErr_Occurred()) |
Raymond Hettinger | 3ba85c2 | 2004-02-06 19:04:56 +0000 | [diff] [blame] | 309 | return NULL; |
| 310 | Py_RETURN_NONE; |
| 311 | } |
| 312 | |
Tim Peters | 1065f75 | 2004-10-01 01:03:29 +0000 | [diff] [blame] | 313 | PyDoc_STRVAR(extendleft_doc, |
Raymond Hettinger | 3ba85c2 | 2004-02-06 19:04:56 +0000 | [diff] [blame] | 314 | "Extend the left side of the deque with elements from the iterable"); |
| 315 | |
Raymond Hettinger | dcb9d94 | 2004-10-09 16:02:18 +0000 | [diff] [blame] | 316 | static int |
| 317 | _deque_rotate(dequeobject *deque, int n) |
Raymond Hettinger | 5c5eb86 | 2004-02-07 21:13:00 +0000 | [diff] [blame] | 318 | { |
Raymond Hettinger | dcb9d94 | 2004-10-09 16:02:18 +0000 | [diff] [blame] | 319 | int i, len=deque->len, halflen=(len+1)>>1; |
Raymond Hettinger | 5c5eb86 | 2004-02-07 21:13:00 +0000 | [diff] [blame] | 320 | PyObject *item, *rv; |
| 321 | |
Raymond Hettinger | ee33b27 | 2004-02-08 04:05:26 +0000 | [diff] [blame] | 322 | if (len == 0) |
Raymond Hettinger | dcb9d94 | 2004-10-09 16:02:18 +0000 | [diff] [blame] | 323 | return 0; |
Raymond Hettinger | ee33b27 | 2004-02-08 04:05:26 +0000 | [diff] [blame] | 324 | if (n > halflen || n < -halflen) { |
| 325 | n %= len; |
| 326 | if (n > halflen) |
| 327 | n -= len; |
| 328 | else if (n < -halflen) |
| 329 | n += len; |
| 330 | } |
Raymond Hettinger | 5c5eb86 | 2004-02-07 21:13:00 +0000 | [diff] [blame] | 331 | |
| 332 | for (i=0 ; i<n ; i++) { |
| 333 | item = deque_pop(deque, NULL); |
Raymond Hettinger | a435c53 | 2004-07-09 04:10:20 +0000 | [diff] [blame] | 334 | assert (item != NULL); |
Raymond Hettinger | 5c5eb86 | 2004-02-07 21:13:00 +0000 | [diff] [blame] | 335 | rv = deque_appendleft(deque, item); |
| 336 | Py_DECREF(item); |
| 337 | if (rv == NULL) |
Raymond Hettinger | dcb9d94 | 2004-10-09 16:02:18 +0000 | [diff] [blame] | 338 | return -1; |
Raymond Hettinger | 5c5eb86 | 2004-02-07 21:13:00 +0000 | [diff] [blame] | 339 | Py_DECREF(rv); |
| 340 | } |
| 341 | for (i=0 ; i>n ; i--) { |
| 342 | item = deque_popleft(deque, NULL); |
Raymond Hettinger | a435c53 | 2004-07-09 04:10:20 +0000 | [diff] [blame] | 343 | assert (item != NULL); |
Raymond Hettinger | 5c5eb86 | 2004-02-07 21:13:00 +0000 | [diff] [blame] | 344 | rv = deque_append(deque, item); |
| 345 | Py_DECREF(item); |
| 346 | if (rv == NULL) |
Raymond Hettinger | dcb9d94 | 2004-10-09 16:02:18 +0000 | [diff] [blame] | 347 | return -1; |
Raymond Hettinger | 5c5eb86 | 2004-02-07 21:13:00 +0000 | [diff] [blame] | 348 | Py_DECREF(rv); |
| 349 | } |
Raymond Hettinger | dcb9d94 | 2004-10-09 16:02:18 +0000 | [diff] [blame] | 350 | return 0; |
| 351 | } |
| 352 | |
| 353 | static PyObject * |
| 354 | deque_rotate(dequeobject *deque, PyObject *args) |
| 355 | { |
| 356 | int n=1; |
| 357 | |
| 358 | if (!PyArg_ParseTuple(args, "|i:rotate", &n)) |
| 359 | return NULL; |
| 360 | if (_deque_rotate(deque, n) == 0) |
| 361 | Py_RETURN_NONE; |
| 362 | return NULL; |
Raymond Hettinger | 5c5eb86 | 2004-02-07 21:13:00 +0000 | [diff] [blame] | 363 | } |
| 364 | |
Tim Peters | 1065f75 | 2004-10-01 01:03:29 +0000 | [diff] [blame] | 365 | PyDoc_STRVAR(rotate_doc, |
Raymond Hettinger | ee33b27 | 2004-02-08 04:05:26 +0000 | [diff] [blame] | 366 | "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] | 367 | |
Raymond Hettinger | 756b3f3 | 2004-01-29 06:37:52 +0000 | [diff] [blame] | 368 | static int |
| 369 | deque_len(dequeobject *deque) |
| 370 | { |
| 371 | return deque->len; |
| 372 | } |
| 373 | |
Raymond Hettinger | 4aec61e | 2005-03-18 21:20:23 +0000 | [diff] [blame] | 374 | static PyObject * |
| 375 | deque_remove(dequeobject *deque, PyObject *value) |
| 376 | { |
| 377 | int i, n=deque->len; |
| 378 | |
| 379 | for (i=0 ; i<n ; i++) { |
| 380 | PyObject *item = deque->leftblock->data[deque->leftindex]; |
| 381 | int cmp = PyObject_RichCompareBool(item, value, Py_EQ); |
Raymond Hettinger | d73202c | 2005-03-19 00:00:51 +0000 | [diff] [blame] | 382 | |
| 383 | if (deque->len != n) { |
| 384 | PyErr_SetString(PyExc_IndexError, |
| 385 | "deque mutated during remove()."); |
| 386 | return NULL; |
| 387 | } |
Raymond Hettinger | 4aec61e | 2005-03-18 21:20:23 +0000 | [diff] [blame] | 388 | if (cmp > 0) { |
Raymond Hettinger | d73202c | 2005-03-19 00:00:51 +0000 | [diff] [blame] | 389 | PyObject *tgt = deque_popleft(deque, NULL); |
Raymond Hettinger | 4aec61e | 2005-03-18 21:20:23 +0000 | [diff] [blame] | 390 | assert (tgt != NULL); |
| 391 | Py_DECREF(tgt); |
| 392 | if (_deque_rotate(deque, i) == -1) |
| 393 | return NULL; |
| 394 | Py_RETURN_NONE; |
| 395 | } |
| 396 | else if (cmp < 0) { |
| 397 | _deque_rotate(deque, i); |
| 398 | return NULL; |
| 399 | } |
| 400 | _deque_rotate(deque, -1); |
| 401 | } |
| 402 | PyErr_SetString(PyExc_ValueError, "deque.remove(x): x not in deque"); |
| 403 | return NULL; |
| 404 | } |
| 405 | |
| 406 | PyDoc_STRVAR(remove_doc, |
| 407 | "D.remove(value) -- remove first occurrence of value."); |
| 408 | |
Raymond Hettinger | 756b3f3 | 2004-01-29 06:37:52 +0000 | [diff] [blame] | 409 | static int |
| 410 | deque_clear(dequeobject *deque) |
| 411 | { |
| 412 | PyObject *item; |
| 413 | |
Raymond Hettinger | d1b3d88 | 2004-10-02 00:43:13 +0000 | [diff] [blame] | 414 | while (deque->len) { |
Raymond Hettinger | 756b3f3 | 2004-01-29 06:37:52 +0000 | [diff] [blame] | 415 | item = deque_pop(deque, NULL); |
Raymond Hettinger | a435c53 | 2004-07-09 04:10:20 +0000 | [diff] [blame] | 416 | assert (item != NULL); |
Raymond Hettinger | 756b3f3 | 2004-01-29 06:37:52 +0000 | [diff] [blame] | 417 | Py_DECREF(item); |
| 418 | } |
| 419 | assert(deque->leftblock == deque->rightblock && |
Raymond Hettinger | d1b3d88 | 2004-10-02 00:43:13 +0000 | [diff] [blame] | 420 | deque->leftindex - 1 == deque->rightindex && |
| 421 | deque->len == 0); |
Raymond Hettinger | 756b3f3 | 2004-01-29 06:37:52 +0000 | [diff] [blame] | 422 | return 0; |
| 423 | } |
| 424 | |
| 425 | static PyObject * |
Raymond Hettinger | 0a4977c | 2004-03-01 23:16:22 +0000 | [diff] [blame] | 426 | deque_item(dequeobject *deque, int i) |
| 427 | { |
| 428 | block *b; |
| 429 | PyObject *item; |
Armin Rigo | 974d757 | 2004-10-02 13:59:34 +0000 | [diff] [blame] | 430 | int n, index=i; |
Raymond Hettinger | 0a4977c | 2004-03-01 23:16:22 +0000 | [diff] [blame] | 431 | |
| 432 | if (i < 0 || i >= deque->len) { |
| 433 | PyErr_SetString(PyExc_IndexError, |
| 434 | "deque index out of range"); |
| 435 | return NULL; |
| 436 | } |
| 437 | |
Raymond Hettinger | 6c79a51 | 2004-03-04 08:00:54 +0000 | [diff] [blame] | 438 | if (i == 0) { |
| 439 | i = deque->leftindex; |
Raymond Hettinger | 0a4977c | 2004-03-01 23:16:22 +0000 | [diff] [blame] | 440 | b = deque->leftblock; |
Raymond Hettinger | 6c79a51 | 2004-03-04 08:00:54 +0000 | [diff] [blame] | 441 | } else if (i == deque->len - 1) { |
| 442 | i = deque->rightindex; |
Raymond Hettinger | 0a4977c | 2004-03-01 23:16:22 +0000 | [diff] [blame] | 443 | b = deque->rightblock; |
Raymond Hettinger | 6c79a51 | 2004-03-04 08:00:54 +0000 | [diff] [blame] | 444 | } else { |
| 445 | i += deque->leftindex; |
| 446 | n = i / BLOCKLEN; |
| 447 | i %= BLOCKLEN; |
Armin Rigo | 974d757 | 2004-10-02 13:59:34 +0000 | [diff] [blame] | 448 | if (index < (deque->len >> 1)) { |
Raymond Hettinger | 6c79a51 | 2004-03-04 08:00:54 +0000 | [diff] [blame] | 449 | b = deque->leftblock; |
| 450 | while (n--) |
| 451 | b = b->rightlink; |
| 452 | } else { |
| 453 | n = (deque->leftindex + deque->len - 1) / BLOCKLEN - n; |
| 454 | b = deque->rightblock; |
| 455 | while (n--) |
| 456 | b = b->leftlink; |
| 457 | } |
Raymond Hettinger | 0a4977c | 2004-03-01 23:16:22 +0000 | [diff] [blame] | 458 | } |
| 459 | item = b->data[i]; |
| 460 | Py_INCREF(item); |
| 461 | return item; |
| 462 | } |
| 463 | |
Raymond Hettinger | 616f4f6 | 2004-06-26 04:42:06 +0000 | [diff] [blame] | 464 | /* delitem() implemented in terms of rotate for simplicity and reasonable |
| 465 | performance near the end points. If for some reason this method becomes |
Tim Peters | 1065f75 | 2004-10-01 01:03:29 +0000 | [diff] [blame] | 466 | popular, it is not hard to re-implement this using direct data movement |
Raymond Hettinger | 616f4f6 | 2004-06-26 04:42:06 +0000 | [diff] [blame] | 467 | (similar to code in list slice assignment) and achieve a two or threefold |
| 468 | performance boost. |
| 469 | */ |
| 470 | |
Raymond Hettinger | 0a4977c | 2004-03-01 23:16:22 +0000 | [diff] [blame] | 471 | static int |
Raymond Hettinger | 0e371f2 | 2004-05-12 20:55:56 +0000 | [diff] [blame] | 472 | deque_del_item(dequeobject *deque, int i) |
| 473 | { |
Raymond Hettinger | dcb9d94 | 2004-10-09 16:02:18 +0000 | [diff] [blame] | 474 | PyObject *item; |
Raymond Hettinger | 0e371f2 | 2004-05-12 20:55:56 +0000 | [diff] [blame] | 475 | |
Tim Peters | 1065f75 | 2004-10-01 01:03:29 +0000 | [diff] [blame] | 476 | assert (i >= 0 && i < deque->len); |
Raymond Hettinger | dcb9d94 | 2004-10-09 16:02:18 +0000 | [diff] [blame] | 477 | if (_deque_rotate(deque, -i) == -1) |
| 478 | return -1; |
Raymond Hettinger | 0e371f2 | 2004-05-12 20:55:56 +0000 | [diff] [blame] | 479 | |
| 480 | item = deque_popleft(deque, NULL); |
Raymond Hettinger | a435c53 | 2004-07-09 04:10:20 +0000 | [diff] [blame] | 481 | assert (item != NULL); |
Raymond Hettinger | 0e371f2 | 2004-05-12 20:55:56 +0000 | [diff] [blame] | 482 | Py_DECREF(item); |
| 483 | |
Raymond Hettinger | dcb9d94 | 2004-10-09 16:02:18 +0000 | [diff] [blame] | 484 | return _deque_rotate(deque, i); |
Raymond Hettinger | 0e371f2 | 2004-05-12 20:55:56 +0000 | [diff] [blame] | 485 | } |
| 486 | |
| 487 | static int |
Raymond Hettinger | 0a4977c | 2004-03-01 23:16:22 +0000 | [diff] [blame] | 488 | deque_ass_item(dequeobject *deque, int i, PyObject *v) |
| 489 | { |
| 490 | PyObject *old_value; |
| 491 | block *b; |
Raymond Hettinger | a435c53 | 2004-07-09 04:10:20 +0000 | [diff] [blame] | 492 | int n, len=deque->len, halflen=(len+1)>>1, index=i; |
Raymond Hettinger | 0a4977c | 2004-03-01 23:16:22 +0000 | [diff] [blame] | 493 | |
Raymond Hettinger | a435c53 | 2004-07-09 04:10:20 +0000 | [diff] [blame] | 494 | if (i < 0 || i >= len) { |
Raymond Hettinger | 0a4977c | 2004-03-01 23:16:22 +0000 | [diff] [blame] | 495 | PyErr_SetString(PyExc_IndexError, |
| 496 | "deque index out of range"); |
| 497 | return -1; |
| 498 | } |
Raymond Hettinger | 0e371f2 | 2004-05-12 20:55:56 +0000 | [diff] [blame] | 499 | if (v == NULL) |
| 500 | return deque_del_item(deque, i); |
| 501 | |
Raymond Hettinger | 0a4977c | 2004-03-01 23:16:22 +0000 | [diff] [blame] | 502 | i += deque->leftindex; |
| 503 | n = i / BLOCKLEN; |
| 504 | i %= BLOCKLEN; |
Raymond Hettinger | a435c53 | 2004-07-09 04:10:20 +0000 | [diff] [blame] | 505 | if (index <= halflen) { |
Raymond Hettinger | 0a4977c | 2004-03-01 23:16:22 +0000 | [diff] [blame] | 506 | b = deque->leftblock; |
| 507 | while (n--) |
| 508 | b = b->rightlink; |
| 509 | } else { |
Raymond Hettinger | a435c53 | 2004-07-09 04:10:20 +0000 | [diff] [blame] | 510 | n = (deque->leftindex + len - 1) / BLOCKLEN - n; |
Raymond Hettinger | 0a4977c | 2004-03-01 23:16:22 +0000 | [diff] [blame] | 511 | b = deque->rightblock; |
| 512 | while (n--) |
| 513 | b = b->leftlink; |
| 514 | } |
| 515 | Py_INCREF(v); |
| 516 | old_value = b->data[i]; |
| 517 | b->data[i] = v; |
| 518 | Py_DECREF(old_value); |
| 519 | return 0; |
| 520 | } |
| 521 | |
| 522 | static PyObject * |
Raymond Hettinger | 756b3f3 | 2004-01-29 06:37:52 +0000 | [diff] [blame] | 523 | deque_clearmethod(dequeobject *deque) |
| 524 | { |
Raymond Hettinger | a435c53 | 2004-07-09 04:10:20 +0000 | [diff] [blame] | 525 | int rv; |
| 526 | |
| 527 | rv = deque_clear(deque); |
| 528 | assert (rv != -1); |
Raymond Hettinger | 756b3f3 | 2004-01-29 06:37:52 +0000 | [diff] [blame] | 529 | Py_RETURN_NONE; |
| 530 | } |
| 531 | |
| 532 | PyDoc_STRVAR(clear_doc, "Remove all elements from the deque."); |
| 533 | |
| 534 | static void |
| 535 | deque_dealloc(dequeobject *deque) |
| 536 | { |
| 537 | PyObject_GC_UnTrack(deque); |
Raymond Hettinger | 691d805 | 2004-05-30 07:26:47 +0000 | [diff] [blame] | 538 | if (deque->weakreflist != NULL) |
| 539 | PyObject_ClearWeakRefs((PyObject *) deque); |
Raymond Hettinger | 756b3f3 | 2004-01-29 06:37:52 +0000 | [diff] [blame] | 540 | if (deque->leftblock != NULL) { |
Raymond Hettinger | e9c89e8 | 2004-07-19 00:10:24 +0000 | [diff] [blame] | 541 | deque_clear(deque); |
Raymond Hettinger | 756b3f3 | 2004-01-29 06:37:52 +0000 | [diff] [blame] | 542 | assert(deque->leftblock != NULL); |
| 543 | PyMem_Free(deque->leftblock); |
| 544 | } |
| 545 | deque->leftblock = NULL; |
| 546 | deque->rightblock = NULL; |
| 547 | deque->ob_type->tp_free(deque); |
| 548 | } |
| 549 | |
| 550 | static int |
Raymond Hettinger | 0a4977c | 2004-03-01 23:16:22 +0000 | [diff] [blame] | 551 | deque_traverse(dequeobject *deque, visitproc visit, void *arg) |
Raymond Hettinger | 756b3f3 | 2004-01-29 06:37:52 +0000 | [diff] [blame] | 552 | { |
Tim Peters | 10c7e86 | 2004-10-01 02:01:04 +0000 | [diff] [blame] | 553 | block *b; |
Raymond Hettinger | 756b3f3 | 2004-01-29 06:37:52 +0000 | [diff] [blame] | 554 | PyObject *item; |
Tim Peters | 10c7e86 | 2004-10-01 02:01:04 +0000 | [diff] [blame] | 555 | int index; |
| 556 | int indexlo = deque->leftindex; |
Raymond Hettinger | 756b3f3 | 2004-01-29 06:37:52 +0000 | [diff] [blame] | 557 | |
Tim Peters | 10c7e86 | 2004-10-01 02:01:04 +0000 | [diff] [blame] | 558 | for (b = deque->leftblock; b != NULL; b = b->rightlink) { |
| 559 | const int indexhi = b == deque->rightblock ? |
| 560 | deque->rightindex : |
| 561 | BLOCKLEN - 1; |
| 562 | |
| 563 | for (index = indexlo; index <= indexhi; ++index) { |
| 564 | item = b->data[index]; |
| 565 | Py_VISIT(item); |
Raymond Hettinger | 756b3f3 | 2004-01-29 06:37:52 +0000 | [diff] [blame] | 566 | } |
Tim Peters | 10c7e86 | 2004-10-01 02:01:04 +0000 | [diff] [blame] | 567 | indexlo = 0; |
Raymond Hettinger | 756b3f3 | 2004-01-29 06:37:52 +0000 | [diff] [blame] | 568 | } |
| 569 | return 0; |
| 570 | } |
| 571 | |
| 572 | static long |
| 573 | deque_nohash(PyObject *self) |
| 574 | { |
| 575 | PyErr_SetString(PyExc_TypeError, "deque objects are unhashable"); |
| 576 | return -1; |
| 577 | } |
| 578 | |
| 579 | static PyObject * |
| 580 | deque_copy(PyObject *deque) |
| 581 | { |
Tim Peters | 1065f75 | 2004-10-01 01:03:29 +0000 | [diff] [blame] | 582 | return PyObject_CallFunctionObjArgs((PyObject *)(deque->ob_type), |
Raymond Hettinger | 756b3f3 | 2004-01-29 06:37:52 +0000 | [diff] [blame] | 583 | deque, NULL); |
| 584 | } |
| 585 | |
| 586 | PyDoc_STRVAR(copy_doc, "Return a shallow copy of a deque."); |
| 587 | |
| 588 | static PyObject * |
| 589 | deque_reduce(dequeobject *deque) |
| 590 | { |
Raymond Hettinger | 952f880 | 2004-11-09 07:27:35 +0000 | [diff] [blame] | 591 | PyObject *dict, *result, *it; |
Raymond Hettinger | 756b3f3 | 2004-01-29 06:37:52 +0000 | [diff] [blame] | 592 | |
Raymond Hettinger | 952f880 | 2004-11-09 07:27:35 +0000 | [diff] [blame] | 593 | dict = PyObject_GetAttrString((PyObject *)deque, "__dict__"); |
| 594 | if (dict == NULL) { |
| 595 | PyErr_Clear(); |
| 596 | dict = Py_None; |
| 597 | Py_INCREF(dict); |
| 598 | } |
| 599 | it = PyObject_GetIter((PyObject *)deque); |
| 600 | if (it == NULL) { |
| 601 | Py_DECREF(dict); |
Raymond Hettinger | 756b3f3 | 2004-01-29 06:37:52 +0000 | [diff] [blame] | 602 | return NULL; |
| 603 | } |
Raymond Hettinger | 952f880 | 2004-11-09 07:27:35 +0000 | [diff] [blame] | 604 | result = Py_BuildValue("O()ON", deque->ob_type, dict, it); |
| 605 | Py_DECREF(dict); |
Raymond Hettinger | 756b3f3 | 2004-01-29 06:37:52 +0000 | [diff] [blame] | 606 | return result; |
| 607 | } |
| 608 | |
| 609 | PyDoc_STRVAR(reduce_doc, "Return state information for pickling."); |
| 610 | |
| 611 | static PyObject * |
| 612 | deque_repr(PyObject *deque) |
| 613 | { |
| 614 | PyObject *aslist, *result, *fmt; |
| 615 | int i; |
| 616 | |
| 617 | i = Py_ReprEnter(deque); |
| 618 | if (i != 0) { |
| 619 | if (i < 0) |
| 620 | return NULL; |
| 621 | return PyString_FromString("[...]"); |
| 622 | } |
| 623 | |
| 624 | aslist = PySequence_List(deque); |
| 625 | if (aslist == NULL) { |
| 626 | Py_ReprLeave(deque); |
| 627 | return NULL; |
| 628 | } |
| 629 | |
| 630 | fmt = PyString_FromString("deque(%r)"); |
| 631 | if (fmt == NULL) { |
| 632 | Py_DECREF(aslist); |
| 633 | Py_ReprLeave(deque); |
| 634 | return NULL; |
| 635 | } |
| 636 | result = PyString_Format(fmt, aslist); |
| 637 | Py_DECREF(fmt); |
| 638 | Py_DECREF(aslist); |
| 639 | Py_ReprLeave(deque); |
| 640 | return result; |
| 641 | } |
| 642 | |
| 643 | static int |
| 644 | deque_tp_print(PyObject *deque, FILE *fp, int flags) |
| 645 | { |
| 646 | PyObject *it, *item; |
Raymond Hettinger | 756b3f3 | 2004-01-29 06:37:52 +0000 | [diff] [blame] | 647 | char *emit = ""; /* No separator emitted on first pass */ |
| 648 | char *separator = ", "; |
| 649 | int i; |
| 650 | |
| 651 | i = Py_ReprEnter(deque); |
| 652 | if (i != 0) { |
| 653 | if (i < 0) |
| 654 | return i; |
| 655 | fputs("[...]", fp); |
| 656 | return 0; |
| 657 | } |
| 658 | |
| 659 | it = PyObject_GetIter(deque); |
| 660 | if (it == NULL) |
| 661 | return -1; |
| 662 | |
| 663 | fputs("deque([", fp); |
| 664 | while ((item = PyIter_Next(it)) != NULL) { |
| 665 | fputs(emit, fp); |
| 666 | emit = separator; |
| 667 | if (PyObject_Print(item, fp, 0) != 0) { |
| 668 | Py_DECREF(item); |
| 669 | Py_DECREF(it); |
| 670 | Py_ReprLeave(deque); |
| 671 | return -1; |
| 672 | } |
| 673 | Py_DECREF(item); |
| 674 | } |
| 675 | Py_ReprLeave(deque); |
| 676 | Py_DECREF(it); |
Tim Peters | 1065f75 | 2004-10-01 01:03:29 +0000 | [diff] [blame] | 677 | if (PyErr_Occurred()) |
Raymond Hettinger | 756b3f3 | 2004-01-29 06:37:52 +0000 | [diff] [blame] | 678 | return -1; |
| 679 | fputs("])", fp); |
| 680 | return 0; |
| 681 | } |
| 682 | |
Raymond Hettinger | 738ec90 | 2004-02-29 02:15:56 +0000 | [diff] [blame] | 683 | static PyObject * |
| 684 | deque_richcompare(PyObject *v, PyObject *w, int op) |
| 685 | { |
| 686 | PyObject *it1=NULL, *it2=NULL, *x, *y; |
Armin Rigo | 974d757 | 2004-10-02 13:59:34 +0000 | [diff] [blame] | 687 | int b, vs, ws, cmp=-1; |
Raymond Hettinger | 738ec90 | 2004-02-29 02:15:56 +0000 | [diff] [blame] | 688 | |
Tim Peters | 1065f75 | 2004-10-01 01:03:29 +0000 | [diff] [blame] | 689 | if (!PyObject_TypeCheck(v, &deque_type) || |
Raymond Hettinger | 285cfcc | 2004-05-18 18:15:03 +0000 | [diff] [blame] | 690 | !PyObject_TypeCheck(w, &deque_type)) { |
Raymond Hettinger | 738ec90 | 2004-02-29 02:15:56 +0000 | [diff] [blame] | 691 | Py_INCREF(Py_NotImplemented); |
| 692 | return Py_NotImplemented; |
| 693 | } |
| 694 | |
| 695 | /* Shortcuts */ |
| 696 | vs = ((dequeobject *)v)->len; |
| 697 | ws = ((dequeobject *)w)->len; |
| 698 | if (op == Py_EQ) { |
| 699 | if (v == w) |
| 700 | Py_RETURN_TRUE; |
| 701 | if (vs != ws) |
| 702 | Py_RETURN_FALSE; |
| 703 | } |
| 704 | if (op == Py_NE) { |
| 705 | if (v == w) |
| 706 | Py_RETURN_FALSE; |
| 707 | if (vs != ws) |
| 708 | Py_RETURN_TRUE; |
| 709 | } |
| 710 | |
| 711 | /* Search for the first index where items are different */ |
| 712 | it1 = PyObject_GetIter(v); |
| 713 | if (it1 == NULL) |
| 714 | goto done; |
| 715 | it2 = PyObject_GetIter(w); |
| 716 | if (it2 == NULL) |
| 717 | goto done; |
Armin Rigo | 974d757 | 2004-10-02 13:59:34 +0000 | [diff] [blame] | 718 | for (;;) { |
Raymond Hettinger | 738ec90 | 2004-02-29 02:15:56 +0000 | [diff] [blame] | 719 | x = PyIter_Next(it1); |
Armin Rigo | 974d757 | 2004-10-02 13:59:34 +0000 | [diff] [blame] | 720 | if (x == NULL && PyErr_Occurred()) |
Raymond Hettinger | 738ec90 | 2004-02-29 02:15:56 +0000 | [diff] [blame] | 721 | goto done; |
| 722 | y = PyIter_Next(it2); |
Armin Rigo | 974d757 | 2004-10-02 13:59:34 +0000 | [diff] [blame] | 723 | if (x == NULL || y == NULL) |
| 724 | break; |
Raymond Hettinger | 738ec90 | 2004-02-29 02:15:56 +0000 | [diff] [blame] | 725 | b = PyObject_RichCompareBool(x, y, Py_EQ); |
| 726 | if (b == 0) { |
| 727 | cmp = PyObject_RichCompareBool(x, y, op); |
| 728 | Py_DECREF(x); |
| 729 | Py_DECREF(y); |
| 730 | goto done; |
| 731 | } |
| 732 | Py_DECREF(x); |
| 733 | Py_DECREF(y); |
| 734 | if (b == -1) |
| 735 | goto done; |
| 736 | } |
Armin Rigo | 974d757 | 2004-10-02 13:59:34 +0000 | [diff] [blame] | 737 | /* We reached the end of one deque or both */ |
| 738 | Py_XDECREF(x); |
| 739 | Py_XDECREF(y); |
| 740 | if (PyErr_Occurred()) |
| 741 | goto done; |
Raymond Hettinger | 738ec90 | 2004-02-29 02:15:56 +0000 | [diff] [blame] | 742 | switch (op) { |
Armin Rigo | 974d757 | 2004-10-02 13:59:34 +0000 | [diff] [blame] | 743 | case Py_LT: cmp = y != NULL; break; /* if w was longer */ |
| 744 | case Py_LE: cmp = x == NULL; break; /* if v was not longer */ |
| 745 | case Py_EQ: cmp = x == y; break; /* if we reached the end of both */ |
| 746 | case Py_NE: cmp = x != y; break; /* if one deque continues */ |
| 747 | case Py_GT: cmp = x != NULL; break; /* if v was longer */ |
| 748 | case Py_GE: cmp = y == NULL; break; /* if w was not longer */ |
Raymond Hettinger | 738ec90 | 2004-02-29 02:15:56 +0000 | [diff] [blame] | 749 | } |
Tim Peters | 1065f75 | 2004-10-01 01:03:29 +0000 | [diff] [blame] | 750 | |
Raymond Hettinger | 738ec90 | 2004-02-29 02:15:56 +0000 | [diff] [blame] | 751 | done: |
| 752 | Py_XDECREF(it1); |
| 753 | Py_XDECREF(it2); |
| 754 | if (cmp == 1) |
| 755 | Py_RETURN_TRUE; |
| 756 | if (cmp == 0) |
| 757 | Py_RETURN_FALSE; |
| 758 | return NULL; |
| 759 | } |
| 760 | |
Raymond Hettinger | 756b3f3 | 2004-01-29 06:37:52 +0000 | [diff] [blame] | 761 | static int |
| 762 | deque_init(dequeobject *deque, PyObject *args, PyObject *kwds) |
| 763 | { |
Raymond Hettinger | 3ba85c2 | 2004-02-06 19:04:56 +0000 | [diff] [blame] | 764 | PyObject *iterable = NULL; |
Raymond Hettinger | 756b3f3 | 2004-01-29 06:37:52 +0000 | [diff] [blame] | 765 | |
| 766 | if (!PyArg_UnpackTuple(args, "deque", 0, 1, &iterable)) |
| 767 | return -1; |
| 768 | |
| 769 | if (iterable != NULL) { |
Raymond Hettinger | 3ba85c2 | 2004-02-06 19:04:56 +0000 | [diff] [blame] | 770 | PyObject *rv = deque_extend(deque, iterable); |
| 771 | if (rv == NULL) |
Raymond Hettinger | 756b3f3 | 2004-01-29 06:37:52 +0000 | [diff] [blame] | 772 | return -1; |
Raymond Hettinger | 3ba85c2 | 2004-02-06 19:04:56 +0000 | [diff] [blame] | 773 | Py_DECREF(rv); |
Raymond Hettinger | 756b3f3 | 2004-01-29 06:37:52 +0000 | [diff] [blame] | 774 | } |
| 775 | return 0; |
| 776 | } |
| 777 | |
| 778 | static PySequenceMethods deque_as_sequence = { |
| 779 | (inquiry)deque_len, /* sq_length */ |
| 780 | 0, /* sq_concat */ |
Raymond Hettinger | 0a4977c | 2004-03-01 23:16:22 +0000 | [diff] [blame] | 781 | 0, /* sq_repeat */ |
| 782 | (intargfunc)deque_item, /* sq_item */ |
| 783 | 0, /* sq_slice */ |
| 784 | (intobjargproc)deque_ass_item, /* sq_ass_item */ |
Raymond Hettinger | 756b3f3 | 2004-01-29 06:37:52 +0000 | [diff] [blame] | 785 | }; |
| 786 | |
| 787 | /* deque object ********************************************************/ |
| 788 | |
| 789 | static PyObject *deque_iter(dequeobject *deque); |
Raymond Hettinger | 1e5809f | 2004-03-18 11:04:57 +0000 | [diff] [blame] | 790 | static PyObject *deque_reviter(dequeobject *deque); |
Tim Peters | 1065f75 | 2004-10-01 01:03:29 +0000 | [diff] [blame] | 791 | PyDoc_STRVAR(reversed_doc, |
Raymond Hettinger | 1e5809f | 2004-03-18 11:04:57 +0000 | [diff] [blame] | 792 | "D.__reversed__() -- return a reverse iterator over the deque"); |
Raymond Hettinger | 756b3f3 | 2004-01-29 06:37:52 +0000 | [diff] [blame] | 793 | |
| 794 | static PyMethodDef deque_methods[] = { |
Tim Peters | 1065f75 | 2004-10-01 01:03:29 +0000 | [diff] [blame] | 795 | {"append", (PyCFunction)deque_append, |
Raymond Hettinger | 756b3f3 | 2004-01-29 06:37:52 +0000 | [diff] [blame] | 796 | METH_O, append_doc}, |
Tim Peters | 1065f75 | 2004-10-01 01:03:29 +0000 | [diff] [blame] | 797 | {"appendleft", (PyCFunction)deque_appendleft, |
Raymond Hettinger | 756b3f3 | 2004-01-29 06:37:52 +0000 | [diff] [blame] | 798 | METH_O, appendleft_doc}, |
Tim Peters | 1065f75 | 2004-10-01 01:03:29 +0000 | [diff] [blame] | 799 | {"clear", (PyCFunction)deque_clearmethod, |
Raymond Hettinger | 756b3f3 | 2004-01-29 06:37:52 +0000 | [diff] [blame] | 800 | METH_NOARGS, clear_doc}, |
Tim Peters | 1065f75 | 2004-10-01 01:03:29 +0000 | [diff] [blame] | 801 | {"__copy__", (PyCFunction)deque_copy, |
Raymond Hettinger | 756b3f3 | 2004-01-29 06:37:52 +0000 | [diff] [blame] | 802 | METH_NOARGS, copy_doc}, |
Tim Peters | 1065f75 | 2004-10-01 01:03:29 +0000 | [diff] [blame] | 803 | {"extend", (PyCFunction)deque_extend, |
Raymond Hettinger | 5c5eb86 | 2004-02-07 21:13:00 +0000 | [diff] [blame] | 804 | METH_O, extend_doc}, |
Raymond Hettinger | 4aec61e | 2005-03-18 21:20:23 +0000 | [diff] [blame] | 805 | {"extendleft", (PyCFunction)deque_extendleft, |
Raymond Hettinger | 5c5eb86 | 2004-02-07 21:13:00 +0000 | [diff] [blame] | 806 | METH_O, extendleft_doc}, |
Tim Peters | 1065f75 | 2004-10-01 01:03:29 +0000 | [diff] [blame] | 807 | {"pop", (PyCFunction)deque_pop, |
Raymond Hettinger | 756b3f3 | 2004-01-29 06:37:52 +0000 | [diff] [blame] | 808 | METH_NOARGS, pop_doc}, |
Tim Peters | 1065f75 | 2004-10-01 01:03:29 +0000 | [diff] [blame] | 809 | {"popleft", (PyCFunction)deque_popleft, |
Raymond Hettinger | 756b3f3 | 2004-01-29 06:37:52 +0000 | [diff] [blame] | 810 | METH_NOARGS, popleft_doc}, |
Tim Peters | 1065f75 | 2004-10-01 01:03:29 +0000 | [diff] [blame] | 811 | {"__reduce__", (PyCFunction)deque_reduce, |
Raymond Hettinger | 756b3f3 | 2004-01-29 06:37:52 +0000 | [diff] [blame] | 812 | METH_NOARGS, reduce_doc}, |
Raymond Hettinger | 4aec61e | 2005-03-18 21:20:23 +0000 | [diff] [blame] | 813 | {"remove", (PyCFunction)deque_remove, |
| 814 | METH_O, remove_doc}, |
Tim Peters | 1065f75 | 2004-10-01 01:03:29 +0000 | [diff] [blame] | 815 | {"__reversed__", (PyCFunction)deque_reviter, |
Raymond Hettinger | 1e5809f | 2004-03-18 11:04:57 +0000 | [diff] [blame] | 816 | METH_NOARGS, reversed_doc}, |
Tim Peters | 1065f75 | 2004-10-01 01:03:29 +0000 | [diff] [blame] | 817 | {"rotate", (PyCFunction)deque_rotate, |
Raymond Hettinger | 5c5eb86 | 2004-02-07 21:13:00 +0000 | [diff] [blame] | 818 | METH_VARARGS, rotate_doc}, |
Raymond Hettinger | 756b3f3 | 2004-01-29 06:37:52 +0000 | [diff] [blame] | 819 | {NULL, NULL} /* sentinel */ |
| 820 | }; |
| 821 | |
| 822 | PyDoc_STRVAR(deque_doc, |
| 823 | "deque(iterable) --> deque object\n\ |
| 824 | \n\ |
| 825 | Build an ordered collection accessible from endpoints only."); |
| 826 | |
Neal Norwitz | 87f1013 | 2004-02-29 15:40:53 +0000 | [diff] [blame] | 827 | static PyTypeObject deque_type = { |
Raymond Hettinger | 756b3f3 | 2004-01-29 06:37:52 +0000 | [diff] [blame] | 828 | PyObject_HEAD_INIT(NULL) |
| 829 | 0, /* ob_size */ |
| 830 | "collections.deque", /* tp_name */ |
| 831 | sizeof(dequeobject), /* tp_basicsize */ |
| 832 | 0, /* tp_itemsize */ |
| 833 | /* methods */ |
| 834 | (destructor)deque_dealloc, /* tp_dealloc */ |
| 835 | (printfunc)deque_tp_print, /* tp_print */ |
| 836 | 0, /* tp_getattr */ |
| 837 | 0, /* tp_setattr */ |
| 838 | 0, /* tp_compare */ |
| 839 | (reprfunc)deque_repr, /* tp_repr */ |
| 840 | 0, /* tp_as_number */ |
| 841 | &deque_as_sequence, /* tp_as_sequence */ |
| 842 | 0, /* tp_as_mapping */ |
| 843 | deque_nohash, /* tp_hash */ |
| 844 | 0, /* tp_call */ |
| 845 | 0, /* tp_str */ |
| 846 | PyObject_GenericGetAttr, /* tp_getattro */ |
| 847 | 0, /* tp_setattro */ |
| 848 | 0, /* tp_as_buffer */ |
Raymond Hettinger | 691d805 | 2004-05-30 07:26:47 +0000 | [diff] [blame] | 849 | Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE | Py_TPFLAGS_HAVE_GC | |
| 850 | Py_TPFLAGS_HAVE_WEAKREFS, /* tp_flags */ |
Raymond Hettinger | 756b3f3 | 2004-01-29 06:37:52 +0000 | [diff] [blame] | 851 | deque_doc, /* tp_doc */ |
Raymond Hettinger | 0a4977c | 2004-03-01 23:16:22 +0000 | [diff] [blame] | 852 | (traverseproc)deque_traverse, /* tp_traverse */ |
Raymond Hettinger | 756b3f3 | 2004-01-29 06:37:52 +0000 | [diff] [blame] | 853 | (inquiry)deque_clear, /* tp_clear */ |
Raymond Hettinger | 738ec90 | 2004-02-29 02:15:56 +0000 | [diff] [blame] | 854 | (richcmpfunc)deque_richcompare, /* tp_richcompare */ |
Raymond Hettinger | 691d805 | 2004-05-30 07:26:47 +0000 | [diff] [blame] | 855 | offsetof(dequeobject, weakreflist), /* tp_weaklistoffset*/ |
Raymond Hettinger | 756b3f3 | 2004-01-29 06:37:52 +0000 | [diff] [blame] | 856 | (getiterfunc)deque_iter, /* tp_iter */ |
| 857 | 0, /* tp_iternext */ |
| 858 | deque_methods, /* tp_methods */ |
| 859 | 0, /* tp_members */ |
| 860 | 0, /* tp_getset */ |
| 861 | 0, /* tp_base */ |
| 862 | 0, /* tp_dict */ |
| 863 | 0, /* tp_descr_get */ |
| 864 | 0, /* tp_descr_set */ |
| 865 | 0, /* tp_dictoffset */ |
| 866 | (initproc)deque_init, /* tp_init */ |
| 867 | PyType_GenericAlloc, /* tp_alloc */ |
| 868 | deque_new, /* tp_new */ |
| 869 | PyObject_GC_Del, /* tp_free */ |
| 870 | }; |
| 871 | |
| 872 | /*********************** Deque Iterator **************************/ |
| 873 | |
| 874 | typedef struct { |
| 875 | PyObject_HEAD |
| 876 | int index; |
| 877 | block *b; |
| 878 | dequeobject *deque; |
Raymond Hettinger | d1b3d88 | 2004-10-02 00:43:13 +0000 | [diff] [blame] | 879 | long state; /* state when the iterator is created */ |
| 880 | int counter; /* number of items remaining for iteration */ |
Raymond Hettinger | 756b3f3 | 2004-01-29 06:37:52 +0000 | [diff] [blame] | 881 | } dequeiterobject; |
| 882 | |
| 883 | PyTypeObject dequeiter_type; |
| 884 | |
| 885 | static PyObject * |
| 886 | deque_iter(dequeobject *deque) |
| 887 | { |
| 888 | dequeiterobject *it; |
| 889 | |
| 890 | it = PyObject_New(dequeiterobject, &dequeiter_type); |
| 891 | if (it == NULL) |
| 892 | return NULL; |
| 893 | it->b = deque->leftblock; |
| 894 | it->index = deque->leftindex; |
| 895 | Py_INCREF(deque); |
| 896 | it->deque = deque; |
Raymond Hettinger | d1b3d88 | 2004-10-02 00:43:13 +0000 | [diff] [blame] | 897 | it->state = deque->state; |
Raymond Hettinger | 1e5809f | 2004-03-18 11:04:57 +0000 | [diff] [blame] | 898 | it->counter = deque->len; |
Raymond Hettinger | 756b3f3 | 2004-01-29 06:37:52 +0000 | [diff] [blame] | 899 | return (PyObject *)it; |
| 900 | } |
| 901 | |
| 902 | static void |
| 903 | dequeiter_dealloc(dequeiterobject *dio) |
| 904 | { |
| 905 | Py_XDECREF(dio->deque); |
| 906 | dio->ob_type->tp_free(dio); |
| 907 | } |
| 908 | |
| 909 | static PyObject * |
| 910 | dequeiter_next(dequeiterobject *it) |
| 911 | { |
| 912 | PyObject *item; |
Raymond Hettinger | d1b3d88 | 2004-10-02 00:43:13 +0000 | [diff] [blame] | 913 | |
| 914 | if (it->counter == 0) |
Raymond Hettinger | 756b3f3 | 2004-01-29 06:37:52 +0000 | [diff] [blame] | 915 | return NULL; |
| 916 | |
Raymond Hettinger | d1b3d88 | 2004-10-02 00:43:13 +0000 | [diff] [blame] | 917 | if (it->deque->state != it->state) { |
Raymond Hettinger | 7892b1c | 2004-04-12 18:10:01 +0000 | [diff] [blame] | 918 | it->counter = 0; |
Raymond Hettinger | 756b3f3 | 2004-01-29 06:37:52 +0000 | [diff] [blame] | 919 | PyErr_SetString(PyExc_RuntimeError, |
Raymond Hettinger | d1b3d88 | 2004-10-02 00:43:13 +0000 | [diff] [blame] | 920 | "deque mutated during iteration"); |
Raymond Hettinger | 756b3f3 | 2004-01-29 06:37:52 +0000 | [diff] [blame] | 921 | return NULL; |
| 922 | } |
Raymond Hettinger | d1b3d88 | 2004-10-02 00:43:13 +0000 | [diff] [blame] | 923 | assert (!(it->b == it->deque->rightblock && |
| 924 | it->index > it->deque->rightindex)); |
Raymond Hettinger | 756b3f3 | 2004-01-29 06:37:52 +0000 | [diff] [blame] | 925 | |
| 926 | item = it->b->data[it->index]; |
| 927 | it->index++; |
Raymond Hettinger | d1b3d88 | 2004-10-02 00:43:13 +0000 | [diff] [blame] | 928 | it->counter--; |
| 929 | if (it->index == BLOCKLEN && it->counter > 0) { |
| 930 | assert (it->b->rightlink != NULL); |
Raymond Hettinger | 756b3f3 | 2004-01-29 06:37:52 +0000 | [diff] [blame] | 931 | it->b = it->b->rightlink; |
| 932 | it->index = 0; |
| 933 | } |
| 934 | Py_INCREF(item); |
| 935 | return item; |
| 936 | } |
| 937 | |
Raymond Hettinger | 6b27cda | 2005-09-24 21:23:05 +0000 | [diff] [blame] | 938 | static PyObject * |
Raymond Hettinger | 1e5809f | 2004-03-18 11:04:57 +0000 | [diff] [blame] | 939 | dequeiter_len(dequeiterobject *it) |
| 940 | { |
Raymond Hettinger | 6b27cda | 2005-09-24 21:23:05 +0000 | [diff] [blame] | 941 | return PyInt_FromLong(it->counter); |
Raymond Hettinger | 1e5809f | 2004-03-18 11:04:57 +0000 | [diff] [blame] | 942 | } |
| 943 | |
Raymond Hettinger | 6b27cda | 2005-09-24 21:23:05 +0000 | [diff] [blame] | 944 | PyDoc_STRVAR(length_cue_doc, "Private method returning an estimate of len(list(it))."); |
| 945 | |
| 946 | static PyMethodDef dequeiter_methods[] = { |
| 947 | {"_length_cue", (PyCFunction)dequeiter_len, METH_NOARGS, length_cue_doc}, |
| 948 | {NULL, NULL} /* sentinel */ |
Raymond Hettinger | 1e5809f | 2004-03-18 11:04:57 +0000 | [diff] [blame] | 949 | }; |
| 950 | |
Raymond Hettinger | 756b3f3 | 2004-01-29 06:37:52 +0000 | [diff] [blame] | 951 | PyTypeObject dequeiter_type = { |
| 952 | PyObject_HEAD_INIT(NULL) |
| 953 | 0, /* ob_size */ |
| 954 | "deque_iterator", /* tp_name */ |
| 955 | sizeof(dequeiterobject), /* tp_basicsize */ |
| 956 | 0, /* tp_itemsize */ |
| 957 | /* methods */ |
| 958 | (destructor)dequeiter_dealloc, /* tp_dealloc */ |
| 959 | 0, /* tp_print */ |
| 960 | 0, /* tp_getattr */ |
| 961 | 0, /* tp_setattr */ |
| 962 | 0, /* tp_compare */ |
| 963 | 0, /* tp_repr */ |
| 964 | 0, /* tp_as_number */ |
Raymond Hettinger | 6b27cda | 2005-09-24 21:23:05 +0000 | [diff] [blame] | 965 | 0, /* tp_as_sequence */ |
Raymond Hettinger | 756b3f3 | 2004-01-29 06:37:52 +0000 | [diff] [blame] | 966 | 0, /* tp_as_mapping */ |
| 967 | 0, /* tp_hash */ |
| 968 | 0, /* tp_call */ |
| 969 | 0, /* tp_str */ |
| 970 | PyObject_GenericGetAttr, /* tp_getattro */ |
| 971 | 0, /* tp_setattro */ |
| 972 | 0, /* tp_as_buffer */ |
| 973 | Py_TPFLAGS_DEFAULT, /* tp_flags */ |
| 974 | 0, /* tp_doc */ |
| 975 | 0, /* tp_traverse */ |
| 976 | 0, /* tp_clear */ |
| 977 | 0, /* tp_richcompare */ |
| 978 | 0, /* tp_weaklistoffset */ |
| 979 | PyObject_SelfIter, /* tp_iter */ |
| 980 | (iternextfunc)dequeiter_next, /* tp_iternext */ |
Raymond Hettinger | 6b27cda | 2005-09-24 21:23:05 +0000 | [diff] [blame] | 981 | dequeiter_methods, /* tp_methods */ |
Raymond Hettinger | 756b3f3 | 2004-01-29 06:37:52 +0000 | [diff] [blame] | 982 | 0, |
| 983 | }; |
| 984 | |
Raymond Hettinger | 1e5809f | 2004-03-18 11:04:57 +0000 | [diff] [blame] | 985 | /*********************** Deque Reverse Iterator **************************/ |
| 986 | |
| 987 | PyTypeObject dequereviter_type; |
| 988 | |
| 989 | static PyObject * |
| 990 | deque_reviter(dequeobject *deque) |
| 991 | { |
| 992 | dequeiterobject *it; |
| 993 | |
| 994 | it = PyObject_New(dequeiterobject, &dequereviter_type); |
| 995 | if (it == NULL) |
| 996 | return NULL; |
| 997 | it->b = deque->rightblock; |
| 998 | it->index = deque->rightindex; |
| 999 | Py_INCREF(deque); |
| 1000 | it->deque = deque; |
Raymond Hettinger | d1b3d88 | 2004-10-02 00:43:13 +0000 | [diff] [blame] | 1001 | it->state = deque->state; |
Raymond Hettinger | 1e5809f | 2004-03-18 11:04:57 +0000 | [diff] [blame] | 1002 | it->counter = deque->len; |
| 1003 | return (PyObject *)it; |
| 1004 | } |
| 1005 | |
| 1006 | static PyObject * |
| 1007 | dequereviter_next(dequeiterobject *it) |
| 1008 | { |
| 1009 | PyObject *item; |
Raymond Hettinger | d1b3d88 | 2004-10-02 00:43:13 +0000 | [diff] [blame] | 1010 | if (it->counter == 0) |
Raymond Hettinger | 1e5809f | 2004-03-18 11:04:57 +0000 | [diff] [blame] | 1011 | return NULL; |
| 1012 | |
Raymond Hettinger | d1b3d88 | 2004-10-02 00:43:13 +0000 | [diff] [blame] | 1013 | if (it->deque->state != it->state) { |
Raymond Hettinger | 7892b1c | 2004-04-12 18:10:01 +0000 | [diff] [blame] | 1014 | it->counter = 0; |
Raymond Hettinger | 1e5809f | 2004-03-18 11:04:57 +0000 | [diff] [blame] | 1015 | PyErr_SetString(PyExc_RuntimeError, |
Raymond Hettinger | d1b3d88 | 2004-10-02 00:43:13 +0000 | [diff] [blame] | 1016 | "deque mutated during iteration"); |
Raymond Hettinger | 1e5809f | 2004-03-18 11:04:57 +0000 | [diff] [blame] | 1017 | return NULL; |
| 1018 | } |
Raymond Hettinger | d1b3d88 | 2004-10-02 00:43:13 +0000 | [diff] [blame] | 1019 | assert (!(it->b == it->deque->leftblock && |
| 1020 | it->index < it->deque->leftindex)); |
Raymond Hettinger | 1e5809f | 2004-03-18 11:04:57 +0000 | [diff] [blame] | 1021 | |
| 1022 | item = it->b->data[it->index]; |
| 1023 | it->index--; |
Raymond Hettinger | d1b3d88 | 2004-10-02 00:43:13 +0000 | [diff] [blame] | 1024 | it->counter--; |
| 1025 | if (it->index == -1 && it->counter > 0) { |
| 1026 | assert (it->b->leftlink != NULL); |
Raymond Hettinger | 1e5809f | 2004-03-18 11:04:57 +0000 | [diff] [blame] | 1027 | it->b = it->b->leftlink; |
| 1028 | it->index = BLOCKLEN - 1; |
| 1029 | } |
Raymond Hettinger | 1e5809f | 2004-03-18 11:04:57 +0000 | [diff] [blame] | 1030 | Py_INCREF(item); |
| 1031 | return item; |
| 1032 | } |
| 1033 | |
| 1034 | PyTypeObject dequereviter_type = { |
| 1035 | PyObject_HEAD_INIT(NULL) |
| 1036 | 0, /* ob_size */ |
| 1037 | "deque_reverse_iterator", /* tp_name */ |
| 1038 | sizeof(dequeiterobject), /* tp_basicsize */ |
| 1039 | 0, /* tp_itemsize */ |
| 1040 | /* methods */ |
| 1041 | (destructor)dequeiter_dealloc, /* tp_dealloc */ |
| 1042 | 0, /* tp_print */ |
| 1043 | 0, /* tp_getattr */ |
| 1044 | 0, /* tp_setattr */ |
| 1045 | 0, /* tp_compare */ |
| 1046 | 0, /* tp_repr */ |
| 1047 | 0, /* tp_as_number */ |
Raymond Hettinger | 6b27cda | 2005-09-24 21:23:05 +0000 | [diff] [blame] | 1048 | 0, /* tp_as_sequence */ |
Raymond Hettinger | 1e5809f | 2004-03-18 11:04:57 +0000 | [diff] [blame] | 1049 | 0, /* tp_as_mapping */ |
| 1050 | 0, /* tp_hash */ |
| 1051 | 0, /* tp_call */ |
| 1052 | 0, /* tp_str */ |
| 1053 | PyObject_GenericGetAttr, /* tp_getattro */ |
| 1054 | 0, /* tp_setattro */ |
| 1055 | 0, /* tp_as_buffer */ |
| 1056 | Py_TPFLAGS_DEFAULT, /* tp_flags */ |
| 1057 | 0, /* tp_doc */ |
| 1058 | 0, /* tp_traverse */ |
| 1059 | 0, /* tp_clear */ |
| 1060 | 0, /* tp_richcompare */ |
| 1061 | 0, /* tp_weaklistoffset */ |
| 1062 | PyObject_SelfIter, /* tp_iter */ |
| 1063 | (iternextfunc)dequereviter_next, /* tp_iternext */ |
Raymond Hettinger | 6b27cda | 2005-09-24 21:23:05 +0000 | [diff] [blame] | 1064 | dequeiter_methods, /* tp_methods */ |
Raymond Hettinger | 1e5809f | 2004-03-18 11:04:57 +0000 | [diff] [blame] | 1065 | 0, |
| 1066 | }; |
| 1067 | |
Raymond Hettinger | 756b3f3 | 2004-01-29 06:37:52 +0000 | [diff] [blame] | 1068 | /* module level code ********************************************************/ |
| 1069 | |
| 1070 | PyDoc_STRVAR(module_doc, |
| 1071 | "High performance data structures\n\ |
| 1072 | "); |
| 1073 | |
| 1074 | PyMODINIT_FUNC |
| 1075 | initcollections(void) |
| 1076 | { |
| 1077 | PyObject *m; |
| 1078 | |
| 1079 | m = Py_InitModule3("collections", NULL, module_doc); |
| 1080 | |
| 1081 | if (PyType_Ready(&deque_type) < 0) |
| 1082 | return; |
| 1083 | Py_INCREF(&deque_type); |
| 1084 | PyModule_AddObject(m, "deque", (PyObject *)&deque_type); |
| 1085 | |
| 1086 | if (PyType_Ready(&dequeiter_type) < 0) |
Tim Peters | 1065f75 | 2004-10-01 01:03:29 +0000 | [diff] [blame] | 1087 | return; |
Raymond Hettinger | 756b3f3 | 2004-01-29 06:37:52 +0000 | [diff] [blame] | 1088 | |
Raymond Hettinger | 1e5809f | 2004-03-18 11:04:57 +0000 | [diff] [blame] | 1089 | if (PyType_Ready(&dequereviter_type) < 0) |
| 1090 | return; |
| 1091 | |
Raymond Hettinger | 756b3f3 | 2004-01-29 06:37:52 +0000 | [diff] [blame] | 1092 | return; |
| 1093 | } |