Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1 | |
| 2 | #include "Python.h" |
| 3 | |
| 4 | /* Itertools module written and maintained |
| 5 | by Raymond D. Hettinger <python@rcn.com> |
| 6 | Copyright (c) 2003 Python Software Foundation. |
| 7 | All rights reserved. |
| 8 | */ |
| 9 | |
Raymond Hettinger | 6a5b027 | 2003-10-24 08:45:23 +0000 | [diff] [blame^] | 10 | /* independent iterator object supporting the tee object ***************/ |
| 11 | |
| 12 | /* The tee object maintains a queue of data seen by the leading iterator |
| 13 | but not seen by the trailing iterator. When the leading iterator |
| 14 | gets data from PyIter_Next() it appends a copy to the inbasket stack. |
| 15 | When the trailing iterator needs data, it is popped from the outbasket |
| 16 | stack. If the outbasket stack is empty, then it is filled from the |
| 17 | inbasket (i.e. the queue is implemented using two stacks so that only |
| 18 | O(n) operations like append() and pop() are used to access data and |
| 19 | calls to reverse() never move any data element more than once). |
| 20 | |
| 21 | If one of the independent iterators gets deallocated, it sets tee's |
| 22 | save_mode to zero so that future calls to PyIter_Next() stop getting |
| 23 | saved to the queue (because there is no longer a second iterator that |
| 24 | may need the data). |
| 25 | */ |
| 26 | |
| 27 | typedef struct { |
| 28 | PyObject_HEAD |
| 29 | PyObject *it; |
| 30 | PyObject *inbasket; |
| 31 | PyObject *outbasket; |
| 32 | int save_mode; |
| 33 | int num_seen; |
| 34 | } teeobject; |
| 35 | |
| 36 | typedef struct { |
| 37 | PyObject_HEAD |
| 38 | teeobject *tee; |
| 39 | int num_seen; |
| 40 | } iiobject; |
| 41 | |
| 42 | static PyTypeObject ii_type; |
| 43 | |
| 44 | static PyObject * |
| 45 | ii_next(iiobject *lz) |
| 46 | { |
| 47 | teeobject *to = lz->tee; |
| 48 | PyObject *result, *tmp; |
| 49 | |
| 50 | if (lz->num_seen == to->num_seen) { |
| 51 | /* This instance is leading, use iter to get more data */ |
| 52 | result = PyIter_Next(to->it); |
| 53 | if (result == NULL) |
| 54 | return NULL; |
| 55 | if (to->save_mode) |
| 56 | PyList_Append(to->inbasket, result); |
| 57 | to->num_seen++; |
| 58 | lz->num_seen++; |
| 59 | return result; |
| 60 | } |
| 61 | |
| 62 | /* This instance is trailing, get data from the queue */ |
| 63 | if (PyList_GET_SIZE(to->outbasket) == 0) { |
| 64 | /* outbasket is empty, so refill from the inbasket */ |
| 65 | tmp = to->outbasket; |
| 66 | to->outbasket = to->inbasket; |
| 67 | to->inbasket = tmp; |
| 68 | PyList_Reverse(to->outbasket); |
| 69 | assert(PyList_GET_SIZE(to->outbasket) > 0); |
| 70 | } |
| 71 | |
| 72 | lz->num_seen++; |
| 73 | return PyObject_CallMethod(to->outbasket, "pop", NULL); |
| 74 | } |
| 75 | |
| 76 | static void |
| 77 | ii_dealloc(iiobject *ii) |
| 78 | { |
| 79 | PyObject_GC_UnTrack(ii); |
| 80 | ii->tee->save_mode = 0; /* Stop saving data */ |
| 81 | Py_XDECREF(ii->tee); |
| 82 | PyObject_GC_Del(ii); |
| 83 | } |
| 84 | |
| 85 | static int |
| 86 | ii_traverse(iiobject *ii, visitproc visit, void *arg) |
| 87 | { |
| 88 | if (ii->tee) |
| 89 | return visit((PyObject *)(ii->tee), arg); |
| 90 | return 0; |
| 91 | } |
| 92 | |
| 93 | PyDoc_STRVAR(ii_doc, "Independent iterators linked to a tee() object."); |
| 94 | |
| 95 | static PyTypeObject ii_type = { |
| 96 | PyObject_HEAD_INIT(&PyType_Type) |
| 97 | 0, /* ob_size */ |
| 98 | "itertools.independent_iterator", /* tp_name */ |
| 99 | sizeof(iiobject), /* tp_basicsize */ |
| 100 | 0, /* tp_itemsize */ |
| 101 | /* methods */ |
| 102 | (destructor)ii_dealloc, /* tp_dealloc */ |
| 103 | 0, /* tp_print */ |
| 104 | 0, /* tp_getattr */ |
| 105 | 0, /* tp_setattr */ |
| 106 | 0, /* tp_compare */ |
| 107 | 0, /* tp_repr */ |
| 108 | 0, /* tp_as_number */ |
| 109 | 0, /* tp_as_sequence */ |
| 110 | 0, /* tp_as_mapping */ |
| 111 | 0, /* tp_hash */ |
| 112 | 0, /* tp_call */ |
| 113 | 0, /* tp_str */ |
| 114 | PyObject_GenericGetAttr, /* tp_getattro */ |
| 115 | 0, /* tp_setattro */ |
| 116 | 0, /* tp_as_buffer */ |
| 117 | Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC,/* tp_flags */ |
| 118 | ii_doc, /* tp_doc */ |
| 119 | (traverseproc)ii_traverse, /* tp_traverse */ |
| 120 | 0, /* tp_clear */ |
| 121 | 0, /* tp_richcompare */ |
| 122 | 0, /* tp_weaklistoffset */ |
| 123 | PyObject_SelfIter, /* tp_iter */ |
| 124 | (iternextfunc)ii_next, /* tp_iternext */ |
| 125 | 0, /* tp_methods */ |
| 126 | }; |
| 127 | |
| 128 | /* tee object **********************************************************/ |
| 129 | |
| 130 | static PyTypeObject tee_type; |
| 131 | |
| 132 | static PyObject * |
| 133 | tee_new(PyTypeObject *type, PyObject *args, PyObject *kwds) |
| 134 | { |
| 135 | PyObject *it = NULL; |
| 136 | PyObject *iterable; |
| 137 | PyObject *inbasket = NULL, *outbasket = NULL, *result = NULL; |
| 138 | teeobject *to = NULL; |
| 139 | int i; |
| 140 | |
| 141 | if (!PyArg_UnpackTuple(args, "tee", 1, 1, &iterable)) |
| 142 | return NULL; |
| 143 | |
| 144 | it = PyObject_GetIter(iterable); |
| 145 | if (it == NULL) goto fail; |
| 146 | |
| 147 | inbasket = PyList_New(0); |
| 148 | if (inbasket == NULL) goto fail; |
| 149 | |
| 150 | outbasket = PyList_New(0); |
| 151 | if (outbasket == NULL) goto fail; |
| 152 | |
| 153 | to = (teeobject *)type->tp_alloc(type, 0); |
| 154 | if (to == NULL) goto fail; |
| 155 | |
| 156 | to->it = it; |
| 157 | to->inbasket = inbasket; |
| 158 | to->outbasket = outbasket; |
| 159 | to->save_mode = 1; |
| 160 | to->num_seen = 0; |
| 161 | |
| 162 | /* create independent iterators */ |
| 163 | result = PyTuple_New(2); |
| 164 | if (result == NULL) goto fail; |
| 165 | for (i=0 ; i<2 ; i++) { |
| 166 | iiobject *indep_it = PyObject_GC_New(iiobject, &ii_type); |
| 167 | if (indep_it == NULL) goto fail; |
| 168 | Py_INCREF(to); |
| 169 | indep_it->tee = to; |
| 170 | indep_it->num_seen = 0; |
| 171 | PyObject_GC_Track(indep_it); |
| 172 | PyTuple_SET_ITEM(result, i, (PyObject *)indep_it); |
| 173 | } |
| 174 | goto succeed; |
| 175 | fail: |
| 176 | Py_XDECREF(it); |
| 177 | Py_XDECREF(inbasket); |
| 178 | Py_XDECREF(outbasket); |
| 179 | Py_XDECREF(result); |
| 180 | succeed: |
| 181 | Py_XDECREF(to); |
| 182 | return result; |
| 183 | } |
| 184 | |
| 185 | static void |
| 186 | tee_dealloc(teeobject *to) |
| 187 | { |
| 188 | PyObject_GC_UnTrack(to); |
| 189 | Py_XDECREF(to->inbasket); |
| 190 | Py_XDECREF(to->outbasket); |
| 191 | Py_XDECREF(to->it); |
| 192 | to->ob_type->tp_free(to); |
| 193 | } |
| 194 | |
| 195 | static int |
| 196 | tee_traverse(teeobject *to, visitproc visit, void *arg) |
| 197 | { |
| 198 | int err; |
| 199 | |
| 200 | if (to->it) { |
| 201 | err = visit(to->it, arg); |
| 202 | if (err) |
| 203 | return err; |
| 204 | } |
| 205 | if (to->inbasket) { |
| 206 | err = visit(to->inbasket, arg); |
| 207 | if (err) |
| 208 | return err; |
| 209 | } |
| 210 | if (to->outbasket) { |
| 211 | err = visit(to->outbasket, arg); |
| 212 | if (err) |
| 213 | return err; |
| 214 | } |
| 215 | return 0; |
| 216 | } |
| 217 | |
| 218 | PyDoc_STRVAR(tee_doc, |
| 219 | "tee(iterable) --> (it1, it2)\n\ |
| 220 | \n\ |
| 221 | Split the iterable into to independent iterables."); |
| 222 | |
| 223 | static PyTypeObject tee_type = { |
| 224 | PyObject_HEAD_INIT(NULL) |
| 225 | 0, /* ob_size */ |
| 226 | "itertools.tee", /* tp_name */ |
| 227 | sizeof(teeobject), /* tp_basicsize */ |
| 228 | 0, /* tp_itemsize */ |
| 229 | /* methods */ |
| 230 | (destructor)tee_dealloc, /* tp_dealloc */ |
| 231 | 0, /* tp_print */ |
| 232 | 0, /* tp_getattr */ |
| 233 | 0, /* tp_setattr */ |
| 234 | 0, /* tp_compare */ |
| 235 | 0, /* tp_repr */ |
| 236 | 0, /* tp_as_number */ |
| 237 | 0, /* tp_as_sequence */ |
| 238 | 0, /* tp_as_mapping */ |
| 239 | 0, /* tp_hash */ |
| 240 | 0, /* tp_call */ |
| 241 | 0, /* tp_str */ |
| 242 | PyObject_GenericGetAttr, /* tp_getattro */ |
| 243 | 0, /* tp_setattro */ |
| 244 | 0, /* tp_as_buffer */ |
| 245 | Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC | |
| 246 | Py_TPFLAGS_BASETYPE, /* tp_flags */ |
| 247 | tee_doc, /* tp_doc */ |
| 248 | (traverseproc)tee_traverse, /* tp_traverse */ |
| 249 | 0, /* tp_clear */ |
| 250 | 0, /* tp_richcompare */ |
| 251 | 0, /* tp_weaklistoffset */ |
| 252 | 0, /* tp_iter */ |
| 253 | 0, /* tp_iternext */ |
| 254 | 0, /* tp_methods */ |
| 255 | 0, /* tp_members */ |
| 256 | 0, /* tp_getset */ |
| 257 | 0, /* tp_base */ |
| 258 | 0, /* tp_dict */ |
| 259 | 0, /* tp_descr_get */ |
| 260 | 0, /* tp_descr_set */ |
| 261 | 0, /* tp_dictoffset */ |
| 262 | 0, /* tp_init */ |
| 263 | 0, /* tp_alloc */ |
| 264 | tee_new, /* tp_new */ |
| 265 | PyObject_GC_Del, /* tp_free */ |
| 266 | }; |
| 267 | |
Raymond Hettinger | 61fe64d | 2003-02-23 04:40:07 +0000 | [diff] [blame] | 268 | /* cycle object **********************************************************/ |
| 269 | |
| 270 | typedef struct { |
| 271 | PyObject_HEAD |
| 272 | PyObject *it; |
| 273 | PyObject *saved; |
| 274 | int firstpass; |
| 275 | } cycleobject; |
| 276 | |
Raymond Hettinger | 1d7a348 | 2003-07-14 07:07:12 +0000 | [diff] [blame] | 277 | static PyTypeObject cycle_type; |
Raymond Hettinger | 61fe64d | 2003-02-23 04:40:07 +0000 | [diff] [blame] | 278 | |
| 279 | static PyObject * |
| 280 | cycle_new(PyTypeObject *type, PyObject *args, PyObject *kwds) |
| 281 | { |
| 282 | PyObject *it; |
| 283 | PyObject *iterable; |
| 284 | PyObject *saved; |
| 285 | cycleobject *lz; |
| 286 | |
| 287 | if (!PyArg_UnpackTuple(args, "cycle", 1, 1, &iterable)) |
| 288 | return NULL; |
| 289 | |
| 290 | /* Get iterator. */ |
| 291 | it = PyObject_GetIter(iterable); |
| 292 | if (it == NULL) |
| 293 | return NULL; |
| 294 | |
| 295 | saved = PyList_New(0); |
| 296 | if (saved == NULL) { |
| 297 | Py_DECREF(it); |
| 298 | return NULL; |
| 299 | } |
| 300 | |
| 301 | /* create cycleobject structure */ |
| 302 | lz = (cycleobject *)type->tp_alloc(type, 0); |
| 303 | if (lz == NULL) { |
| 304 | Py_DECREF(it); |
| 305 | Py_DECREF(saved); |
| 306 | return NULL; |
| 307 | } |
| 308 | lz->it = it; |
| 309 | lz->saved = saved; |
| 310 | lz->firstpass = 0; |
| 311 | |
| 312 | return (PyObject *)lz; |
| 313 | } |
| 314 | |
| 315 | static void |
| 316 | cycle_dealloc(cycleobject *lz) |
| 317 | { |
| 318 | PyObject_GC_UnTrack(lz); |
| 319 | Py_XDECREF(lz->saved); |
| 320 | Py_XDECREF(lz->it); |
| 321 | lz->ob_type->tp_free(lz); |
| 322 | } |
| 323 | |
| 324 | static int |
| 325 | cycle_traverse(cycleobject *lz, visitproc visit, void *arg) |
| 326 | { |
| 327 | int err; |
| 328 | |
| 329 | if (lz->it) { |
| 330 | err = visit(lz->it, arg); |
| 331 | if (err) |
| 332 | return err; |
| 333 | } |
| 334 | if (lz->saved) { |
| 335 | err = visit(lz->saved, arg); |
| 336 | if (err) |
| 337 | return err; |
| 338 | } |
| 339 | return 0; |
| 340 | } |
| 341 | |
| 342 | static PyObject * |
| 343 | cycle_next(cycleobject *lz) |
| 344 | { |
| 345 | PyObject *item; |
| 346 | PyObject *it; |
| 347 | |
| 348 | while (1) { |
| 349 | item = PyIter_Next(lz->it); |
| 350 | if (item != NULL) { |
| 351 | if (!lz->firstpass) |
| 352 | PyList_Append(lz->saved, item); |
| 353 | return item; |
| 354 | } |
| 355 | if (PyList_Size(lz->saved) == 0) |
| 356 | return NULL; |
| 357 | it = PyObject_GetIter(lz->saved); |
| 358 | if (it == NULL) |
| 359 | return NULL; |
| 360 | Py_DECREF(lz->it); |
| 361 | lz->it = it; |
| 362 | lz->firstpass = 1; |
| 363 | } |
| 364 | } |
| 365 | |
Raymond Hettinger | 61fe64d | 2003-02-23 04:40:07 +0000 | [diff] [blame] | 366 | PyDoc_STRVAR(cycle_doc, |
| 367 | "cycle(iterable) --> cycle object\n\ |
| 368 | \n\ |
| 369 | Return elements from the iterable until it is exhausted.\n\ |
| 370 | Then repeat the sequence indefinitely."); |
| 371 | |
Raymond Hettinger | 1d7a348 | 2003-07-14 07:07:12 +0000 | [diff] [blame] | 372 | static PyTypeObject cycle_type = { |
Raymond Hettinger | 61fe64d | 2003-02-23 04:40:07 +0000 | [diff] [blame] | 373 | PyObject_HEAD_INIT(NULL) |
| 374 | 0, /* ob_size */ |
| 375 | "itertools.cycle", /* tp_name */ |
| 376 | sizeof(cycleobject), /* tp_basicsize */ |
| 377 | 0, /* tp_itemsize */ |
| 378 | /* methods */ |
| 379 | (destructor)cycle_dealloc, /* tp_dealloc */ |
| 380 | 0, /* tp_print */ |
| 381 | 0, /* tp_getattr */ |
| 382 | 0, /* tp_setattr */ |
| 383 | 0, /* tp_compare */ |
| 384 | 0, /* tp_repr */ |
| 385 | 0, /* tp_as_number */ |
| 386 | 0, /* tp_as_sequence */ |
| 387 | 0, /* tp_as_mapping */ |
| 388 | 0, /* tp_hash */ |
| 389 | 0, /* tp_call */ |
| 390 | 0, /* tp_str */ |
| 391 | PyObject_GenericGetAttr, /* tp_getattro */ |
| 392 | 0, /* tp_setattro */ |
| 393 | 0, /* tp_as_buffer */ |
| 394 | Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC | |
| 395 | Py_TPFLAGS_BASETYPE, /* tp_flags */ |
| 396 | cycle_doc, /* tp_doc */ |
| 397 | (traverseproc)cycle_traverse, /* tp_traverse */ |
| 398 | 0, /* tp_clear */ |
| 399 | 0, /* tp_richcompare */ |
| 400 | 0, /* tp_weaklistoffset */ |
Raymond Hettinger | 1da1dbf | 2003-03-17 19:46:11 +0000 | [diff] [blame] | 401 | PyObject_SelfIter, /* tp_iter */ |
Raymond Hettinger | 61fe64d | 2003-02-23 04:40:07 +0000 | [diff] [blame] | 402 | (iternextfunc)cycle_next, /* tp_iternext */ |
| 403 | 0, /* tp_methods */ |
| 404 | 0, /* tp_members */ |
| 405 | 0, /* tp_getset */ |
| 406 | 0, /* tp_base */ |
| 407 | 0, /* tp_dict */ |
| 408 | 0, /* tp_descr_get */ |
| 409 | 0, /* tp_descr_set */ |
| 410 | 0, /* tp_dictoffset */ |
| 411 | 0, /* tp_init */ |
Raymond Hettinger | bfef18c | 2003-05-23 03:55:42 +0000 | [diff] [blame] | 412 | 0, /* tp_alloc */ |
Raymond Hettinger | 61fe64d | 2003-02-23 04:40:07 +0000 | [diff] [blame] | 413 | cycle_new, /* tp_new */ |
| 414 | PyObject_GC_Del, /* tp_free */ |
| 415 | }; |
| 416 | |
| 417 | |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 418 | /* dropwhile object **********************************************************/ |
| 419 | |
| 420 | typedef struct { |
| 421 | PyObject_HEAD |
| 422 | PyObject *func; |
| 423 | PyObject *it; |
| 424 | long start; |
| 425 | } dropwhileobject; |
| 426 | |
Raymond Hettinger | 1d7a348 | 2003-07-14 07:07:12 +0000 | [diff] [blame] | 427 | static PyTypeObject dropwhile_type; |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 428 | |
| 429 | static PyObject * |
| 430 | dropwhile_new(PyTypeObject *type, PyObject *args, PyObject *kwds) |
| 431 | { |
| 432 | PyObject *func, *seq; |
| 433 | PyObject *it; |
| 434 | dropwhileobject *lz; |
| 435 | |
| 436 | if (!PyArg_UnpackTuple(args, "dropwhile", 2, 2, &func, &seq)) |
| 437 | return NULL; |
| 438 | |
| 439 | /* Get iterator. */ |
| 440 | it = PyObject_GetIter(seq); |
| 441 | if (it == NULL) |
| 442 | return NULL; |
| 443 | |
| 444 | /* create dropwhileobject structure */ |
| 445 | lz = (dropwhileobject *)type->tp_alloc(type, 0); |
| 446 | if (lz == NULL) { |
| 447 | Py_DECREF(it); |
| 448 | return NULL; |
| 449 | } |
| 450 | Py_INCREF(func); |
| 451 | lz->func = func; |
| 452 | lz->it = it; |
| 453 | lz->start = 0; |
| 454 | |
| 455 | return (PyObject *)lz; |
| 456 | } |
| 457 | |
| 458 | static void |
| 459 | dropwhile_dealloc(dropwhileobject *lz) |
| 460 | { |
| 461 | PyObject_GC_UnTrack(lz); |
| 462 | Py_XDECREF(lz->func); |
| 463 | Py_XDECREF(lz->it); |
| 464 | lz->ob_type->tp_free(lz); |
| 465 | } |
| 466 | |
| 467 | static int |
| 468 | dropwhile_traverse(dropwhileobject *lz, visitproc visit, void *arg) |
| 469 | { |
| 470 | int err; |
| 471 | |
| 472 | if (lz->it) { |
| 473 | err = visit(lz->it, arg); |
| 474 | if (err) |
| 475 | return err; |
| 476 | } |
| 477 | if (lz->func) { |
| 478 | err = visit(lz->func, arg); |
| 479 | if (err) |
| 480 | return err; |
| 481 | } |
| 482 | return 0; |
| 483 | } |
| 484 | |
| 485 | static PyObject * |
| 486 | dropwhile_next(dropwhileobject *lz) |
| 487 | { |
| 488 | PyObject *item, *good; |
Raymond Hettinger | d1a283b | 2003-03-01 01:48:24 +0000 | [diff] [blame] | 489 | PyObject *it = lz->it; |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 490 | long ok; |
| 491 | |
| 492 | for (;;) { |
Raymond Hettinger | d1a283b | 2003-03-01 01:48:24 +0000 | [diff] [blame] | 493 | assert(PyIter_Check(it)); |
| 494 | item = (*it->ob_type->tp_iternext)(it); |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 495 | if (item == NULL) |
| 496 | return NULL; |
| 497 | if (lz->start == 1) |
| 498 | return item; |
| 499 | |
| 500 | good = PyObject_CallFunctionObjArgs(lz->func, item, NULL); |
| 501 | if (good == NULL) { |
| 502 | Py_DECREF(item); |
| 503 | return NULL; |
| 504 | } |
| 505 | ok = PyObject_IsTrue(good); |
| 506 | Py_DECREF(good); |
| 507 | if (!ok) { |
| 508 | lz->start = 1; |
| 509 | return item; |
| 510 | } |
| 511 | Py_DECREF(item); |
| 512 | } |
| 513 | } |
| 514 | |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 515 | PyDoc_STRVAR(dropwhile_doc, |
| 516 | "dropwhile(predicate, iterable) --> dropwhile object\n\ |
| 517 | \n\ |
| 518 | Drop items from the iterable while predicate(item) is true.\n\ |
| 519 | Afterwards, return every element until the iterable is exhausted."); |
| 520 | |
Raymond Hettinger | 1d7a348 | 2003-07-14 07:07:12 +0000 | [diff] [blame] | 521 | static PyTypeObject dropwhile_type = { |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 522 | PyObject_HEAD_INIT(NULL) |
| 523 | 0, /* ob_size */ |
Raymond Hettinger | 60eca93 | 2003-02-09 06:40:58 +0000 | [diff] [blame] | 524 | "itertools.dropwhile", /* tp_name */ |
| 525 | sizeof(dropwhileobject), /* tp_basicsize */ |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 526 | 0, /* tp_itemsize */ |
| 527 | /* methods */ |
Raymond Hettinger | 60eca93 | 2003-02-09 06:40:58 +0000 | [diff] [blame] | 528 | (destructor)dropwhile_dealloc, /* tp_dealloc */ |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 529 | 0, /* tp_print */ |
| 530 | 0, /* tp_getattr */ |
| 531 | 0, /* tp_setattr */ |
| 532 | 0, /* tp_compare */ |
| 533 | 0, /* tp_repr */ |
| 534 | 0, /* tp_as_number */ |
| 535 | 0, /* tp_as_sequence */ |
| 536 | 0, /* tp_as_mapping */ |
| 537 | 0, /* tp_hash */ |
| 538 | 0, /* tp_call */ |
| 539 | 0, /* tp_str */ |
| 540 | PyObject_GenericGetAttr, /* tp_getattro */ |
| 541 | 0, /* tp_setattro */ |
| 542 | 0, /* tp_as_buffer */ |
| 543 | Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC | |
| 544 | Py_TPFLAGS_BASETYPE, /* tp_flags */ |
Raymond Hettinger | 60eca93 | 2003-02-09 06:40:58 +0000 | [diff] [blame] | 545 | dropwhile_doc, /* tp_doc */ |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 546 | (traverseproc)dropwhile_traverse, /* tp_traverse */ |
| 547 | 0, /* tp_clear */ |
| 548 | 0, /* tp_richcompare */ |
| 549 | 0, /* tp_weaklistoffset */ |
Raymond Hettinger | 1da1dbf | 2003-03-17 19:46:11 +0000 | [diff] [blame] | 550 | PyObject_SelfIter, /* tp_iter */ |
Raymond Hettinger | 60eca93 | 2003-02-09 06:40:58 +0000 | [diff] [blame] | 551 | (iternextfunc)dropwhile_next, /* tp_iternext */ |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 552 | 0, /* tp_methods */ |
| 553 | 0, /* tp_members */ |
| 554 | 0, /* tp_getset */ |
| 555 | 0, /* tp_base */ |
| 556 | 0, /* tp_dict */ |
| 557 | 0, /* tp_descr_get */ |
| 558 | 0, /* tp_descr_set */ |
| 559 | 0, /* tp_dictoffset */ |
| 560 | 0, /* tp_init */ |
Raymond Hettinger | bfef18c | 2003-05-23 03:55:42 +0000 | [diff] [blame] | 561 | 0, /* tp_alloc */ |
Raymond Hettinger | 60eca93 | 2003-02-09 06:40:58 +0000 | [diff] [blame] | 562 | dropwhile_new, /* tp_new */ |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 563 | PyObject_GC_Del, /* tp_free */ |
| 564 | }; |
| 565 | |
| 566 | |
| 567 | /* takewhile object **********************************************************/ |
| 568 | |
| 569 | typedef struct { |
| 570 | PyObject_HEAD |
| 571 | PyObject *func; |
| 572 | PyObject *it; |
| 573 | long stop; |
| 574 | } takewhileobject; |
| 575 | |
Raymond Hettinger | 1d7a348 | 2003-07-14 07:07:12 +0000 | [diff] [blame] | 576 | static PyTypeObject takewhile_type; |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 577 | |
| 578 | static PyObject * |
| 579 | takewhile_new(PyTypeObject *type, PyObject *args, PyObject *kwds) |
| 580 | { |
| 581 | PyObject *func, *seq; |
| 582 | PyObject *it; |
| 583 | takewhileobject *lz; |
| 584 | |
| 585 | if (!PyArg_UnpackTuple(args, "takewhile", 2, 2, &func, &seq)) |
| 586 | return NULL; |
| 587 | |
| 588 | /* Get iterator. */ |
| 589 | it = PyObject_GetIter(seq); |
| 590 | if (it == NULL) |
| 591 | return NULL; |
| 592 | |
| 593 | /* create takewhileobject structure */ |
| 594 | lz = (takewhileobject *)type->tp_alloc(type, 0); |
| 595 | if (lz == NULL) { |
| 596 | Py_DECREF(it); |
| 597 | return NULL; |
| 598 | } |
| 599 | Py_INCREF(func); |
| 600 | lz->func = func; |
| 601 | lz->it = it; |
| 602 | lz->stop = 0; |
| 603 | |
| 604 | return (PyObject *)lz; |
| 605 | } |
| 606 | |
| 607 | static void |
| 608 | takewhile_dealloc(takewhileobject *lz) |
| 609 | { |
| 610 | PyObject_GC_UnTrack(lz); |
| 611 | Py_XDECREF(lz->func); |
| 612 | Py_XDECREF(lz->it); |
| 613 | lz->ob_type->tp_free(lz); |
| 614 | } |
| 615 | |
| 616 | static int |
| 617 | takewhile_traverse(takewhileobject *lz, visitproc visit, void *arg) |
| 618 | { |
| 619 | int err; |
| 620 | |
| 621 | if (lz->it) { |
| 622 | err = visit(lz->it, arg); |
| 623 | if (err) |
| 624 | return err; |
| 625 | } |
| 626 | if (lz->func) { |
| 627 | err = visit(lz->func, arg); |
| 628 | if (err) |
| 629 | return err; |
| 630 | } |
| 631 | return 0; |
| 632 | } |
| 633 | |
| 634 | static PyObject * |
| 635 | takewhile_next(takewhileobject *lz) |
| 636 | { |
| 637 | PyObject *item, *good; |
Raymond Hettinger | d1a283b | 2003-03-01 01:48:24 +0000 | [diff] [blame] | 638 | PyObject *it = lz->it; |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 639 | long ok; |
| 640 | |
| 641 | if (lz->stop == 1) |
| 642 | return NULL; |
| 643 | |
Raymond Hettinger | d1a283b | 2003-03-01 01:48:24 +0000 | [diff] [blame] | 644 | assert(PyIter_Check(it)); |
| 645 | item = (*it->ob_type->tp_iternext)(it); |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 646 | if (item == NULL) |
| 647 | return NULL; |
| 648 | |
| 649 | good = PyObject_CallFunctionObjArgs(lz->func, item, NULL); |
| 650 | if (good == NULL) { |
| 651 | Py_DECREF(item); |
| 652 | return NULL; |
| 653 | } |
| 654 | ok = PyObject_IsTrue(good); |
| 655 | Py_DECREF(good); |
| 656 | if (ok) |
| 657 | return item; |
| 658 | Py_DECREF(item); |
| 659 | lz->stop = 1; |
| 660 | return NULL; |
| 661 | } |
| 662 | |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 663 | PyDoc_STRVAR(takewhile_doc, |
| 664 | "takewhile(predicate, iterable) --> takewhile object\n\ |
| 665 | \n\ |
| 666 | Return successive entries from an iterable as long as the \n\ |
| 667 | predicate evaluates to true for each entry."); |
| 668 | |
Raymond Hettinger | 1d7a348 | 2003-07-14 07:07:12 +0000 | [diff] [blame] | 669 | static PyTypeObject takewhile_type = { |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 670 | PyObject_HEAD_INIT(NULL) |
| 671 | 0, /* ob_size */ |
Raymond Hettinger | 60eca93 | 2003-02-09 06:40:58 +0000 | [diff] [blame] | 672 | "itertools.takewhile", /* tp_name */ |
| 673 | sizeof(takewhileobject), /* tp_basicsize */ |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 674 | 0, /* tp_itemsize */ |
| 675 | /* methods */ |
Raymond Hettinger | 60eca93 | 2003-02-09 06:40:58 +0000 | [diff] [blame] | 676 | (destructor)takewhile_dealloc, /* tp_dealloc */ |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 677 | 0, /* tp_print */ |
| 678 | 0, /* tp_getattr */ |
| 679 | 0, /* tp_setattr */ |
| 680 | 0, /* tp_compare */ |
| 681 | 0, /* tp_repr */ |
| 682 | 0, /* tp_as_number */ |
| 683 | 0, /* tp_as_sequence */ |
| 684 | 0, /* tp_as_mapping */ |
| 685 | 0, /* tp_hash */ |
| 686 | 0, /* tp_call */ |
| 687 | 0, /* tp_str */ |
| 688 | PyObject_GenericGetAttr, /* tp_getattro */ |
| 689 | 0, /* tp_setattro */ |
| 690 | 0, /* tp_as_buffer */ |
| 691 | Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC | |
| 692 | Py_TPFLAGS_BASETYPE, /* tp_flags */ |
Raymond Hettinger | 60eca93 | 2003-02-09 06:40:58 +0000 | [diff] [blame] | 693 | takewhile_doc, /* tp_doc */ |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 694 | (traverseproc)takewhile_traverse, /* tp_traverse */ |
| 695 | 0, /* tp_clear */ |
| 696 | 0, /* tp_richcompare */ |
| 697 | 0, /* tp_weaklistoffset */ |
Raymond Hettinger | 1da1dbf | 2003-03-17 19:46:11 +0000 | [diff] [blame] | 698 | PyObject_SelfIter, /* tp_iter */ |
Raymond Hettinger | 60eca93 | 2003-02-09 06:40:58 +0000 | [diff] [blame] | 699 | (iternextfunc)takewhile_next, /* tp_iternext */ |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 700 | 0, /* tp_methods */ |
| 701 | 0, /* tp_members */ |
| 702 | 0, /* tp_getset */ |
| 703 | 0, /* tp_base */ |
| 704 | 0, /* tp_dict */ |
| 705 | 0, /* tp_descr_get */ |
| 706 | 0, /* tp_descr_set */ |
| 707 | 0, /* tp_dictoffset */ |
| 708 | 0, /* tp_init */ |
Raymond Hettinger | bfef18c | 2003-05-23 03:55:42 +0000 | [diff] [blame] | 709 | 0, /* tp_alloc */ |
Raymond Hettinger | 60eca93 | 2003-02-09 06:40:58 +0000 | [diff] [blame] | 710 | takewhile_new, /* tp_new */ |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 711 | PyObject_GC_Del, /* tp_free */ |
| 712 | }; |
| 713 | |
| 714 | |
| 715 | /* islice object ************************************************************/ |
| 716 | |
| 717 | typedef struct { |
| 718 | PyObject_HEAD |
| 719 | PyObject *it; |
| 720 | long next; |
| 721 | long stop; |
| 722 | long step; |
| 723 | long cnt; |
| 724 | } isliceobject; |
| 725 | |
Raymond Hettinger | 1d7a348 | 2003-07-14 07:07:12 +0000 | [diff] [blame] | 726 | static PyTypeObject islice_type; |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 727 | |
| 728 | static PyObject * |
| 729 | islice_new(PyTypeObject *type, PyObject *args, PyObject *kwds) |
| 730 | { |
| 731 | PyObject *seq; |
Raymond Hettinger | 14ef54c | 2003-05-02 19:04:37 +0000 | [diff] [blame] | 732 | long start=0, stop=-1, step=1; |
| 733 | PyObject *it, *a1=NULL, *a2=NULL; |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 734 | int numargs; |
| 735 | isliceobject *lz; |
| 736 | |
| 737 | numargs = PyTuple_Size(args); |
Raymond Hettinger | 341deb7 | 2003-05-02 19:44:20 +0000 | [diff] [blame] | 738 | if (!PyArg_ParseTuple(args, "OO|Ol:islice", &seq, &a1, &a2, &step)) |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 739 | return NULL; |
| 740 | |
| 741 | if (numargs == 2) { |
Raymond Hettinger | 14ef54c | 2003-05-02 19:04:37 +0000 | [diff] [blame] | 742 | if (a1 != Py_None) { |
| 743 | stop = PyInt_AsLong(a1); |
| 744 | if (stop == -1) { |
| 745 | if (PyErr_Occurred()) |
| 746 | PyErr_Clear(); |
| 747 | PyErr_SetString(PyExc_ValueError, |
| 748 | "Stop argument must be an integer or None."); |
| 749 | return NULL; |
| 750 | } |
| 751 | } |
Raymond Hettinger | 341deb7 | 2003-05-02 19:44:20 +0000 | [diff] [blame] | 752 | } else { |
Raymond Hettinger | 14ef54c | 2003-05-02 19:04:37 +0000 | [diff] [blame] | 753 | start = PyInt_AsLong(a1); |
| 754 | if (start == -1 && PyErr_Occurred()) { |
| 755 | PyErr_Clear(); |
| 756 | PyErr_SetString(PyExc_ValueError, |
| 757 | "Start argument must be an integer."); |
| 758 | return NULL; |
| 759 | } |
| 760 | if (a2 != Py_None) { |
| 761 | stop = PyInt_AsLong(a2); |
| 762 | if (stop == -1) { |
| 763 | if (PyErr_Occurred()) |
| 764 | PyErr_Clear(); |
| 765 | PyErr_SetString(PyExc_ValueError, |
| 766 | "Stop argument must be an integer or None."); |
| 767 | return NULL; |
| 768 | } |
| 769 | } |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 770 | } |
| 771 | |
Raymond Hettinger | 14ef54c | 2003-05-02 19:04:37 +0000 | [diff] [blame] | 772 | if (start<0 || stop<-1) { |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 773 | PyErr_SetString(PyExc_ValueError, |
| 774 | "Indices for islice() must be positive."); |
| 775 | return NULL; |
| 776 | } |
| 777 | |
| 778 | if (step<1) { |
| 779 | PyErr_SetString(PyExc_ValueError, |
| 780 | "Step must be one or larger for islice()."); |
| 781 | return NULL; |
| 782 | } |
| 783 | |
| 784 | /* Get iterator. */ |
| 785 | it = PyObject_GetIter(seq); |
| 786 | if (it == NULL) |
| 787 | return NULL; |
| 788 | |
| 789 | /* create isliceobject structure */ |
| 790 | lz = (isliceobject *)type->tp_alloc(type, 0); |
| 791 | if (lz == NULL) { |
| 792 | Py_DECREF(it); |
| 793 | return NULL; |
| 794 | } |
| 795 | lz->it = it; |
| 796 | lz->next = start; |
| 797 | lz->stop = stop; |
| 798 | lz->step = step; |
| 799 | lz->cnt = 0L; |
| 800 | |
| 801 | return (PyObject *)lz; |
| 802 | } |
| 803 | |
| 804 | static void |
| 805 | islice_dealloc(isliceobject *lz) |
| 806 | { |
| 807 | PyObject_GC_UnTrack(lz); |
| 808 | Py_XDECREF(lz->it); |
| 809 | lz->ob_type->tp_free(lz); |
| 810 | } |
| 811 | |
| 812 | static int |
| 813 | islice_traverse(isliceobject *lz, visitproc visit, void *arg) |
| 814 | { |
| 815 | if (lz->it) |
| 816 | return visit(lz->it, arg); |
| 817 | return 0; |
| 818 | } |
| 819 | |
| 820 | static PyObject * |
| 821 | islice_next(isliceobject *lz) |
| 822 | { |
| 823 | PyObject *item; |
Raymond Hettinger | d1a283b | 2003-03-01 01:48:24 +0000 | [diff] [blame] | 824 | PyObject *it = lz->it; |
Raymond Hettinger | 2012f17 | 2003-02-07 05:32:58 +0000 | [diff] [blame] | 825 | long oldnext; |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 826 | |
| 827 | while (lz->cnt < lz->next) { |
Raymond Hettinger | d1a283b | 2003-03-01 01:48:24 +0000 | [diff] [blame] | 828 | assert(PyIter_Check(it)); |
| 829 | item = (*it->ob_type->tp_iternext)(it); |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 830 | if (item == NULL) |
| 831 | return NULL; |
| 832 | Py_DECREF(item); |
| 833 | lz->cnt++; |
| 834 | } |
Raymond Hettinger | 14ef54c | 2003-05-02 19:04:37 +0000 | [diff] [blame] | 835 | if (lz->stop != -1 && lz->cnt >= lz->stop) |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 836 | return NULL; |
Raymond Hettinger | d1a283b | 2003-03-01 01:48:24 +0000 | [diff] [blame] | 837 | assert(PyIter_Check(it)); |
| 838 | item = (*it->ob_type->tp_iternext)(it); |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 839 | if (item == NULL) |
| 840 | return NULL; |
| 841 | lz->cnt++; |
Raymond Hettinger | 2012f17 | 2003-02-07 05:32:58 +0000 | [diff] [blame] | 842 | oldnext = lz->next; |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 843 | lz->next += lz->step; |
Raymond Hettinger | 2012f17 | 2003-02-07 05:32:58 +0000 | [diff] [blame] | 844 | if (lz->next < oldnext) /* Check for overflow */ |
| 845 | lz->next = lz->stop; |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 846 | return item; |
| 847 | } |
| 848 | |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 849 | PyDoc_STRVAR(islice_doc, |
| 850 | "islice(iterable, [start,] stop [, step]) --> islice object\n\ |
| 851 | \n\ |
| 852 | Return an iterator whose next() method returns selected values from an\n\ |
| 853 | iterable. If start is specified, will skip all preceding elements;\n\ |
| 854 | otherwise, start defaults to zero. Step defaults to one. If\n\ |
| 855 | specified as another value, step determines how many values are \n\ |
| 856 | skipped between successive calls. Works like a slice() on a list\n\ |
| 857 | but returns an iterator."); |
| 858 | |
Raymond Hettinger | 1d7a348 | 2003-07-14 07:07:12 +0000 | [diff] [blame] | 859 | static PyTypeObject islice_type = { |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 860 | PyObject_HEAD_INIT(NULL) |
| 861 | 0, /* ob_size */ |
| 862 | "itertools.islice", /* tp_name */ |
| 863 | sizeof(isliceobject), /* tp_basicsize */ |
| 864 | 0, /* tp_itemsize */ |
| 865 | /* methods */ |
Raymond Hettinger | 60eca93 | 2003-02-09 06:40:58 +0000 | [diff] [blame] | 866 | (destructor)islice_dealloc, /* tp_dealloc */ |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 867 | 0, /* tp_print */ |
| 868 | 0, /* tp_getattr */ |
| 869 | 0, /* tp_setattr */ |
| 870 | 0, /* tp_compare */ |
| 871 | 0, /* tp_repr */ |
| 872 | 0, /* tp_as_number */ |
| 873 | 0, /* tp_as_sequence */ |
| 874 | 0, /* tp_as_mapping */ |
| 875 | 0, /* tp_hash */ |
| 876 | 0, /* tp_call */ |
| 877 | 0, /* tp_str */ |
| 878 | PyObject_GenericGetAttr, /* tp_getattro */ |
| 879 | 0, /* tp_setattro */ |
| 880 | 0, /* tp_as_buffer */ |
| 881 | Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC | |
| 882 | Py_TPFLAGS_BASETYPE, /* tp_flags */ |
Raymond Hettinger | 60eca93 | 2003-02-09 06:40:58 +0000 | [diff] [blame] | 883 | islice_doc, /* tp_doc */ |
| 884 | (traverseproc)islice_traverse, /* tp_traverse */ |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 885 | 0, /* tp_clear */ |
| 886 | 0, /* tp_richcompare */ |
| 887 | 0, /* tp_weaklistoffset */ |
Raymond Hettinger | 1da1dbf | 2003-03-17 19:46:11 +0000 | [diff] [blame] | 888 | PyObject_SelfIter, /* tp_iter */ |
Raymond Hettinger | 60eca93 | 2003-02-09 06:40:58 +0000 | [diff] [blame] | 889 | (iternextfunc)islice_next, /* tp_iternext */ |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 890 | 0, /* tp_methods */ |
| 891 | 0, /* tp_members */ |
| 892 | 0, /* tp_getset */ |
| 893 | 0, /* tp_base */ |
| 894 | 0, /* tp_dict */ |
| 895 | 0, /* tp_descr_get */ |
| 896 | 0, /* tp_descr_set */ |
| 897 | 0, /* tp_dictoffset */ |
| 898 | 0, /* tp_init */ |
Raymond Hettinger | bfef18c | 2003-05-23 03:55:42 +0000 | [diff] [blame] | 899 | 0, /* tp_alloc */ |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 900 | islice_new, /* tp_new */ |
| 901 | PyObject_GC_Del, /* tp_free */ |
| 902 | }; |
| 903 | |
| 904 | |
| 905 | /* starmap object ************************************************************/ |
| 906 | |
| 907 | typedef struct { |
| 908 | PyObject_HEAD |
| 909 | PyObject *func; |
| 910 | PyObject *it; |
| 911 | } starmapobject; |
| 912 | |
Raymond Hettinger | 1d7a348 | 2003-07-14 07:07:12 +0000 | [diff] [blame] | 913 | static PyTypeObject starmap_type; |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 914 | |
| 915 | static PyObject * |
| 916 | starmap_new(PyTypeObject *type, PyObject *args, PyObject *kwds) |
| 917 | { |
| 918 | PyObject *func, *seq; |
| 919 | PyObject *it; |
| 920 | starmapobject *lz; |
| 921 | |
| 922 | if (!PyArg_UnpackTuple(args, "starmap", 2, 2, &func, &seq)) |
| 923 | return NULL; |
| 924 | |
| 925 | /* Get iterator. */ |
| 926 | it = PyObject_GetIter(seq); |
| 927 | if (it == NULL) |
| 928 | return NULL; |
| 929 | |
| 930 | /* create starmapobject structure */ |
| 931 | lz = (starmapobject *)type->tp_alloc(type, 0); |
| 932 | if (lz == NULL) { |
| 933 | Py_DECREF(it); |
| 934 | return NULL; |
| 935 | } |
| 936 | Py_INCREF(func); |
| 937 | lz->func = func; |
| 938 | lz->it = it; |
| 939 | |
| 940 | return (PyObject *)lz; |
| 941 | } |
| 942 | |
| 943 | static void |
| 944 | starmap_dealloc(starmapobject *lz) |
| 945 | { |
| 946 | PyObject_GC_UnTrack(lz); |
| 947 | Py_XDECREF(lz->func); |
| 948 | Py_XDECREF(lz->it); |
| 949 | lz->ob_type->tp_free(lz); |
| 950 | } |
| 951 | |
| 952 | static int |
| 953 | starmap_traverse(starmapobject *lz, visitproc visit, void *arg) |
| 954 | { |
| 955 | int err; |
| 956 | |
| 957 | if (lz->it) { |
| 958 | err = visit(lz->it, arg); |
| 959 | if (err) |
| 960 | return err; |
| 961 | } |
| 962 | if (lz->func) { |
| 963 | err = visit(lz->func, arg); |
| 964 | if (err) |
| 965 | return err; |
| 966 | } |
| 967 | return 0; |
| 968 | } |
| 969 | |
| 970 | static PyObject * |
| 971 | starmap_next(starmapobject *lz) |
| 972 | { |
| 973 | PyObject *args; |
| 974 | PyObject *result; |
Raymond Hettinger | d1a283b | 2003-03-01 01:48:24 +0000 | [diff] [blame] | 975 | PyObject *it = lz->it; |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 976 | |
Raymond Hettinger | d1a283b | 2003-03-01 01:48:24 +0000 | [diff] [blame] | 977 | assert(PyIter_Check(it)); |
| 978 | args = (*it->ob_type->tp_iternext)(it); |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 979 | if (args == NULL) |
| 980 | return NULL; |
Raymond Hettinger | 2012f17 | 2003-02-07 05:32:58 +0000 | [diff] [blame] | 981 | if (!PyTuple_CheckExact(args)) { |
| 982 | Py_DECREF(args); |
| 983 | PyErr_SetString(PyExc_TypeError, |
| 984 | "iterator must return a tuple"); |
| 985 | return NULL; |
| 986 | } |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 987 | result = PyObject_Call(lz->func, args, NULL); |
| 988 | Py_DECREF(args); |
| 989 | return result; |
| 990 | } |
| 991 | |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 992 | PyDoc_STRVAR(starmap_doc, |
| 993 | "starmap(function, sequence) --> starmap object\n\ |
| 994 | \n\ |
| 995 | Return an iterator whose values are returned from the function evaluated\n\ |
| 996 | with a argument tuple taken from the given sequence."); |
| 997 | |
Raymond Hettinger | 1d7a348 | 2003-07-14 07:07:12 +0000 | [diff] [blame] | 998 | static PyTypeObject starmap_type = { |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 999 | PyObject_HEAD_INIT(NULL) |
| 1000 | 0, /* ob_size */ |
Raymond Hettinger | 60eca93 | 2003-02-09 06:40:58 +0000 | [diff] [blame] | 1001 | "itertools.starmap", /* tp_name */ |
| 1002 | sizeof(starmapobject), /* tp_basicsize */ |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1003 | 0, /* tp_itemsize */ |
| 1004 | /* methods */ |
Raymond Hettinger | 60eca93 | 2003-02-09 06:40:58 +0000 | [diff] [blame] | 1005 | (destructor)starmap_dealloc, /* tp_dealloc */ |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1006 | 0, /* tp_print */ |
| 1007 | 0, /* tp_getattr */ |
| 1008 | 0, /* tp_setattr */ |
| 1009 | 0, /* tp_compare */ |
| 1010 | 0, /* tp_repr */ |
| 1011 | 0, /* tp_as_number */ |
| 1012 | 0, /* tp_as_sequence */ |
| 1013 | 0, /* tp_as_mapping */ |
| 1014 | 0, /* tp_hash */ |
| 1015 | 0, /* tp_call */ |
| 1016 | 0, /* tp_str */ |
| 1017 | PyObject_GenericGetAttr, /* tp_getattro */ |
| 1018 | 0, /* tp_setattro */ |
| 1019 | 0, /* tp_as_buffer */ |
| 1020 | Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC | |
| 1021 | Py_TPFLAGS_BASETYPE, /* tp_flags */ |
Raymond Hettinger | 60eca93 | 2003-02-09 06:40:58 +0000 | [diff] [blame] | 1022 | starmap_doc, /* tp_doc */ |
| 1023 | (traverseproc)starmap_traverse, /* tp_traverse */ |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1024 | 0, /* tp_clear */ |
| 1025 | 0, /* tp_richcompare */ |
| 1026 | 0, /* tp_weaklistoffset */ |
Raymond Hettinger | 1da1dbf | 2003-03-17 19:46:11 +0000 | [diff] [blame] | 1027 | PyObject_SelfIter, /* tp_iter */ |
Raymond Hettinger | 60eca93 | 2003-02-09 06:40:58 +0000 | [diff] [blame] | 1028 | (iternextfunc)starmap_next, /* tp_iternext */ |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1029 | 0, /* tp_methods */ |
| 1030 | 0, /* tp_members */ |
| 1031 | 0, /* tp_getset */ |
| 1032 | 0, /* tp_base */ |
| 1033 | 0, /* tp_dict */ |
| 1034 | 0, /* tp_descr_get */ |
| 1035 | 0, /* tp_descr_set */ |
| 1036 | 0, /* tp_dictoffset */ |
| 1037 | 0, /* tp_init */ |
Raymond Hettinger | bfef18c | 2003-05-23 03:55:42 +0000 | [diff] [blame] | 1038 | 0, /* tp_alloc */ |
Raymond Hettinger | 60eca93 | 2003-02-09 06:40:58 +0000 | [diff] [blame] | 1039 | starmap_new, /* tp_new */ |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1040 | PyObject_GC_Del, /* tp_free */ |
| 1041 | }; |
| 1042 | |
| 1043 | |
| 1044 | /* imap object ************************************************************/ |
| 1045 | |
| 1046 | typedef struct { |
| 1047 | PyObject_HEAD |
| 1048 | PyObject *iters; |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1049 | PyObject *func; |
| 1050 | } imapobject; |
| 1051 | |
Raymond Hettinger | 1d7a348 | 2003-07-14 07:07:12 +0000 | [diff] [blame] | 1052 | static PyTypeObject imap_type; |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1053 | |
| 1054 | static PyObject * |
| 1055 | imap_new(PyTypeObject *type, PyObject *args, PyObject *kwds) |
| 1056 | { |
Raymond Hettinger | f0c0024 | 2003-02-07 07:26:25 +0000 | [diff] [blame] | 1057 | PyObject *it, *iters, *func; |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1058 | imapobject *lz; |
| 1059 | int numargs, i; |
| 1060 | |
| 1061 | numargs = PyTuple_Size(args); |
| 1062 | if (numargs < 2) { |
| 1063 | PyErr_SetString(PyExc_TypeError, |
| 1064 | "imap() must have at least two arguments."); |
| 1065 | return NULL; |
| 1066 | } |
| 1067 | |
| 1068 | iters = PyTuple_New(numargs-1); |
| 1069 | if (iters == NULL) |
| 1070 | return NULL; |
| 1071 | |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1072 | for (i=1 ; i<numargs ; i++) { |
| 1073 | /* Get iterator. */ |
| 1074 | it = PyObject_GetIter(PyTuple_GET_ITEM(args, i)); |
| 1075 | if (it == NULL) { |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1076 | Py_DECREF(iters); |
| 1077 | return NULL; |
| 1078 | } |
| 1079 | PyTuple_SET_ITEM(iters, i-1, it); |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1080 | } |
| 1081 | |
| 1082 | /* create imapobject structure */ |
| 1083 | lz = (imapobject *)type->tp_alloc(type, 0); |
| 1084 | if (lz == NULL) { |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1085 | Py_DECREF(iters); |
| 1086 | return NULL; |
| 1087 | } |
| 1088 | lz->iters = iters; |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1089 | func = PyTuple_GET_ITEM(args, 0); |
| 1090 | Py_INCREF(func); |
| 1091 | lz->func = func; |
| 1092 | |
| 1093 | return (PyObject *)lz; |
| 1094 | } |
| 1095 | |
| 1096 | static void |
| 1097 | imap_dealloc(imapobject *lz) |
| 1098 | { |
| 1099 | PyObject_GC_UnTrack(lz); |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1100 | Py_XDECREF(lz->iters); |
| 1101 | Py_XDECREF(lz->func); |
| 1102 | lz->ob_type->tp_free(lz); |
| 1103 | } |
| 1104 | |
| 1105 | static int |
| 1106 | imap_traverse(imapobject *lz, visitproc visit, void *arg) |
| 1107 | { |
| 1108 | int err; |
| 1109 | |
| 1110 | if (lz->iters) { |
| 1111 | err = visit(lz->iters, arg); |
| 1112 | if (err) |
| 1113 | return err; |
| 1114 | } |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1115 | if (lz->func) { |
| 1116 | err = visit(lz->func, arg); |
| 1117 | if (err) |
| 1118 | return err; |
| 1119 | } |
| 1120 | return 0; |
| 1121 | } |
| 1122 | |
Raymond Hettinger | 2012f17 | 2003-02-07 05:32:58 +0000 | [diff] [blame] | 1123 | /* |
| 1124 | imap() is an iterator version of __builtins__.map() except that it does |
| 1125 | not have the None fill-in feature. That was intentionally left out for |
| 1126 | the following reasons: |
| 1127 | |
| 1128 | 1) Itertools are designed to be easily combined and chained together. |
| 1129 | Having all tools stop with the shortest input is a unifying principle |
| 1130 | that makes it easier to combine finite iterators (supplying data) with |
| 1131 | infinite iterators like count() and repeat() (for supplying sequential |
| 1132 | or constant arguments to a function). |
| 1133 | |
| 1134 | 2) In typical use cases for combining itertools, having one finite data |
| 1135 | supplier run out before another is likely to be an error condition which |
| 1136 | should not pass silently by automatically supplying None. |
| 1137 | |
| 1138 | 3) The use cases for automatic None fill-in are rare -- not many functions |
| 1139 | do something useful when a parameter suddenly switches type and becomes |
| 1140 | None. |
| 1141 | |
| 1142 | 4) If a need does arise, it can be met by __builtins__.map() or by |
Raymond Hettinger | befa37d | 2003-06-18 19:25:37 +0000 | [diff] [blame] | 1143 | writing: chain(iterable, repeat(None)). |
Raymond Hettinger | 2012f17 | 2003-02-07 05:32:58 +0000 | [diff] [blame] | 1144 | |
| 1145 | 5) Similar toolsets in Haskell and SML do not have automatic None fill-in. |
| 1146 | */ |
| 1147 | |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1148 | static PyObject * |
| 1149 | imap_next(imapobject *lz) |
| 1150 | { |
| 1151 | PyObject *val; |
Raymond Hettinger | f0c0024 | 2003-02-07 07:26:25 +0000 | [diff] [blame] | 1152 | PyObject *argtuple; |
| 1153 | PyObject *result; |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1154 | int numargs, i; |
| 1155 | |
| 1156 | numargs = PyTuple_Size(lz->iters); |
Raymond Hettinger | f0c0024 | 2003-02-07 07:26:25 +0000 | [diff] [blame] | 1157 | argtuple = PyTuple_New(numargs); |
| 1158 | if (argtuple == NULL) |
| 1159 | return NULL; |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1160 | |
Raymond Hettinger | f0c0024 | 2003-02-07 07:26:25 +0000 | [diff] [blame] | 1161 | for (i=0 ; i<numargs ; i++) { |
| 1162 | val = PyIter_Next(PyTuple_GET_ITEM(lz->iters, i)); |
| 1163 | if (val == NULL) { |
| 1164 | Py_DECREF(argtuple); |
| 1165 | return NULL; |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1166 | } |
Raymond Hettinger | f0c0024 | 2003-02-07 07:26:25 +0000 | [diff] [blame] | 1167 | PyTuple_SET_ITEM(argtuple, i, val); |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1168 | } |
Raymond Hettinger | f0c0024 | 2003-02-07 07:26:25 +0000 | [diff] [blame] | 1169 | if (lz->func == Py_None) |
| 1170 | return argtuple; |
| 1171 | result = PyObject_Call(lz->func, argtuple, NULL); |
| 1172 | Py_DECREF(argtuple); |
| 1173 | return result; |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1174 | } |
| 1175 | |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1176 | PyDoc_STRVAR(imap_doc, |
| 1177 | "imap(func, *iterables) --> imap object\n\ |
| 1178 | \n\ |
| 1179 | Make an iterator that computes the function using arguments from\n\ |
| 1180 | each of the iterables. Like map() except that it returns\n\ |
| 1181 | an iterator instead of a list and that it stops when the shortest\n\ |
| 1182 | iterable is exhausted instead of filling in None for shorter\n\ |
| 1183 | iterables."); |
| 1184 | |
Raymond Hettinger | 1d7a348 | 2003-07-14 07:07:12 +0000 | [diff] [blame] | 1185 | static PyTypeObject imap_type = { |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1186 | PyObject_HEAD_INIT(NULL) |
| 1187 | 0, /* ob_size */ |
Raymond Hettinger | 60eca93 | 2003-02-09 06:40:58 +0000 | [diff] [blame] | 1188 | "itertools.imap", /* tp_name */ |
| 1189 | sizeof(imapobject), /* tp_basicsize */ |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1190 | 0, /* tp_itemsize */ |
| 1191 | /* methods */ |
| 1192 | (destructor)imap_dealloc, /* tp_dealloc */ |
| 1193 | 0, /* tp_print */ |
| 1194 | 0, /* tp_getattr */ |
| 1195 | 0, /* tp_setattr */ |
| 1196 | 0, /* tp_compare */ |
| 1197 | 0, /* tp_repr */ |
| 1198 | 0, /* tp_as_number */ |
| 1199 | 0, /* tp_as_sequence */ |
| 1200 | 0, /* tp_as_mapping */ |
| 1201 | 0, /* tp_hash */ |
| 1202 | 0, /* tp_call */ |
| 1203 | 0, /* tp_str */ |
| 1204 | PyObject_GenericGetAttr, /* tp_getattro */ |
| 1205 | 0, /* tp_setattro */ |
| 1206 | 0, /* tp_as_buffer */ |
| 1207 | Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC | |
| 1208 | Py_TPFLAGS_BASETYPE, /* tp_flags */ |
| 1209 | imap_doc, /* tp_doc */ |
| 1210 | (traverseproc)imap_traverse, /* tp_traverse */ |
| 1211 | 0, /* tp_clear */ |
| 1212 | 0, /* tp_richcompare */ |
| 1213 | 0, /* tp_weaklistoffset */ |
Raymond Hettinger | 1da1dbf | 2003-03-17 19:46:11 +0000 | [diff] [blame] | 1214 | PyObject_SelfIter, /* tp_iter */ |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1215 | (iternextfunc)imap_next, /* tp_iternext */ |
| 1216 | 0, /* tp_methods */ |
| 1217 | 0, /* tp_members */ |
| 1218 | 0, /* tp_getset */ |
| 1219 | 0, /* tp_base */ |
| 1220 | 0, /* tp_dict */ |
| 1221 | 0, /* tp_descr_get */ |
| 1222 | 0, /* tp_descr_set */ |
| 1223 | 0, /* tp_dictoffset */ |
| 1224 | 0, /* tp_init */ |
Raymond Hettinger | bfef18c | 2003-05-23 03:55:42 +0000 | [diff] [blame] | 1225 | 0, /* tp_alloc */ |
Raymond Hettinger | 60eca93 | 2003-02-09 06:40:58 +0000 | [diff] [blame] | 1226 | imap_new, /* tp_new */ |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1227 | PyObject_GC_Del, /* tp_free */ |
| 1228 | }; |
| 1229 | |
| 1230 | |
Raymond Hettinger | 61fe64d | 2003-02-23 04:40:07 +0000 | [diff] [blame] | 1231 | /* chain object ************************************************************/ |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1232 | |
| 1233 | typedef struct { |
| 1234 | PyObject_HEAD |
Raymond Hettinger | 61fe64d | 2003-02-23 04:40:07 +0000 | [diff] [blame] | 1235 | long tuplesize; |
| 1236 | long iternum; /* which iterator is active */ |
| 1237 | PyObject *ittuple; /* tuple of iterators */ |
| 1238 | } chainobject; |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1239 | |
Raymond Hettinger | 1d7a348 | 2003-07-14 07:07:12 +0000 | [diff] [blame] | 1240 | static PyTypeObject chain_type; |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1241 | |
| 1242 | static PyObject * |
Raymond Hettinger | 61fe64d | 2003-02-23 04:40:07 +0000 | [diff] [blame] | 1243 | chain_new(PyTypeObject *type, PyObject *args, PyObject *kwds) |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1244 | { |
Raymond Hettinger | 61fe64d | 2003-02-23 04:40:07 +0000 | [diff] [blame] | 1245 | chainobject *lz; |
| 1246 | int tuplesize = PySequence_Length(args); |
| 1247 | int i; |
| 1248 | PyObject *ittuple; |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1249 | |
Raymond Hettinger | 61fe64d | 2003-02-23 04:40:07 +0000 | [diff] [blame] | 1250 | /* obtain iterators */ |
| 1251 | assert(PyTuple_Check(args)); |
| 1252 | ittuple = PyTuple_New(tuplesize); |
| 1253 | if(ittuple == NULL) |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1254 | return NULL; |
Raymond Hettinger | 61fe64d | 2003-02-23 04:40:07 +0000 | [diff] [blame] | 1255 | for (i=0; i < tuplesize; ++i) { |
| 1256 | PyObject *item = PyTuple_GET_ITEM(args, i); |
| 1257 | PyObject *it = PyObject_GetIter(item); |
| 1258 | if (it == NULL) { |
| 1259 | if (PyErr_ExceptionMatches(PyExc_TypeError)) |
| 1260 | PyErr_Format(PyExc_TypeError, |
| 1261 | "chain argument #%d must support iteration", |
| 1262 | i+1); |
| 1263 | Py_DECREF(ittuple); |
| 1264 | return NULL; |
| 1265 | } |
| 1266 | PyTuple_SET_ITEM(ittuple, i, it); |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1267 | } |
| 1268 | |
Raymond Hettinger | 61fe64d | 2003-02-23 04:40:07 +0000 | [diff] [blame] | 1269 | /* create chainobject structure */ |
| 1270 | lz = (chainobject *)type->tp_alloc(type, 0); |
Raymond Hettinger | 7d98fb9 | 2003-06-17 23:14:40 +0000 | [diff] [blame] | 1271 | if (lz == NULL) { |
| 1272 | Py_DECREF(ittuple); |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1273 | return NULL; |
Raymond Hettinger | 7d98fb9 | 2003-06-17 23:14:40 +0000 | [diff] [blame] | 1274 | } |
Raymond Hettinger | 61fe64d | 2003-02-23 04:40:07 +0000 | [diff] [blame] | 1275 | |
| 1276 | lz->ittuple = ittuple; |
| 1277 | lz->iternum = 0; |
| 1278 | lz->tuplesize = tuplesize; |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1279 | |
| 1280 | return (PyObject *)lz; |
| 1281 | } |
| 1282 | |
| 1283 | static void |
Raymond Hettinger | 61fe64d | 2003-02-23 04:40:07 +0000 | [diff] [blame] | 1284 | chain_dealloc(chainobject *lz) |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1285 | { |
| 1286 | PyObject_GC_UnTrack(lz); |
Raymond Hettinger | 61fe64d | 2003-02-23 04:40:07 +0000 | [diff] [blame] | 1287 | Py_XDECREF(lz->ittuple); |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1288 | lz->ob_type->tp_free(lz); |
| 1289 | } |
| 1290 | |
Raymond Hettinger | 2012f17 | 2003-02-07 05:32:58 +0000 | [diff] [blame] | 1291 | static int |
Raymond Hettinger | 61fe64d | 2003-02-23 04:40:07 +0000 | [diff] [blame] | 1292 | chain_traverse(chainobject *lz, visitproc visit, void *arg) |
Raymond Hettinger | 2012f17 | 2003-02-07 05:32:58 +0000 | [diff] [blame] | 1293 | { |
Raymond Hettinger | 61fe64d | 2003-02-23 04:40:07 +0000 | [diff] [blame] | 1294 | if (lz->ittuple) |
| 1295 | return visit(lz->ittuple, arg); |
Raymond Hettinger | 2012f17 | 2003-02-07 05:32:58 +0000 | [diff] [blame] | 1296 | return 0; |
| 1297 | } |
| 1298 | |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1299 | static PyObject * |
Raymond Hettinger | 61fe64d | 2003-02-23 04:40:07 +0000 | [diff] [blame] | 1300 | chain_next(chainobject *lz) |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1301 | { |
Raymond Hettinger | 61fe64d | 2003-02-23 04:40:07 +0000 | [diff] [blame] | 1302 | PyObject *it; |
| 1303 | PyObject *item; |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1304 | |
Raymond Hettinger | 61fe64d | 2003-02-23 04:40:07 +0000 | [diff] [blame] | 1305 | while (lz->iternum < lz->tuplesize) { |
| 1306 | it = PyTuple_GET_ITEM(lz->ittuple, lz->iternum); |
| 1307 | item = PyIter_Next(it); |
| 1308 | if (item != NULL) |
| 1309 | return item; |
| 1310 | lz->iternum++; |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1311 | } |
| 1312 | return NULL; |
| 1313 | } |
| 1314 | |
Raymond Hettinger | 61fe64d | 2003-02-23 04:40:07 +0000 | [diff] [blame] | 1315 | PyDoc_STRVAR(chain_doc, |
| 1316 | "chain(*iterables) --> chain object\n\ |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1317 | \n\ |
Raymond Hettinger | 61fe64d | 2003-02-23 04:40:07 +0000 | [diff] [blame] | 1318 | Return a chain object whose .next() method returns elements from the\n\ |
| 1319 | first iterable until it is exhausted, then elements from the next\n\ |
| 1320 | iterable, until all of the iterables are exhausted."); |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1321 | |
Raymond Hettinger | 1d7a348 | 2003-07-14 07:07:12 +0000 | [diff] [blame] | 1322 | static PyTypeObject chain_type = { |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1323 | PyObject_HEAD_INIT(NULL) |
| 1324 | 0, /* ob_size */ |
Raymond Hettinger | 61fe64d | 2003-02-23 04:40:07 +0000 | [diff] [blame] | 1325 | "itertools.chain", /* tp_name */ |
| 1326 | sizeof(chainobject), /* tp_basicsize */ |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1327 | 0, /* tp_itemsize */ |
| 1328 | /* methods */ |
Raymond Hettinger | 61fe64d | 2003-02-23 04:40:07 +0000 | [diff] [blame] | 1329 | (destructor)chain_dealloc, /* tp_dealloc */ |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1330 | 0, /* tp_print */ |
| 1331 | 0, /* tp_getattr */ |
| 1332 | 0, /* tp_setattr */ |
| 1333 | 0, /* tp_compare */ |
| 1334 | 0, /* tp_repr */ |
| 1335 | 0, /* tp_as_number */ |
| 1336 | 0, /* tp_as_sequence */ |
| 1337 | 0, /* tp_as_mapping */ |
| 1338 | 0, /* tp_hash */ |
| 1339 | 0, /* tp_call */ |
| 1340 | 0, /* tp_str */ |
| 1341 | PyObject_GenericGetAttr, /* tp_getattro */ |
| 1342 | 0, /* tp_setattro */ |
| 1343 | 0, /* tp_as_buffer */ |
| 1344 | Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC | |
| 1345 | Py_TPFLAGS_BASETYPE, /* tp_flags */ |
Raymond Hettinger | 61fe64d | 2003-02-23 04:40:07 +0000 | [diff] [blame] | 1346 | chain_doc, /* tp_doc */ |
| 1347 | (traverseproc)chain_traverse, /* tp_traverse */ |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1348 | 0, /* tp_clear */ |
| 1349 | 0, /* tp_richcompare */ |
| 1350 | 0, /* tp_weaklistoffset */ |
Raymond Hettinger | 1da1dbf | 2003-03-17 19:46:11 +0000 | [diff] [blame] | 1351 | PyObject_SelfIter, /* tp_iter */ |
Raymond Hettinger | 61fe64d | 2003-02-23 04:40:07 +0000 | [diff] [blame] | 1352 | (iternextfunc)chain_next, /* tp_iternext */ |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1353 | 0, /* tp_methods */ |
| 1354 | 0, /* tp_members */ |
| 1355 | 0, /* tp_getset */ |
| 1356 | 0, /* tp_base */ |
| 1357 | 0, /* tp_dict */ |
| 1358 | 0, /* tp_descr_get */ |
| 1359 | 0, /* tp_descr_set */ |
| 1360 | 0, /* tp_dictoffset */ |
| 1361 | 0, /* tp_init */ |
Raymond Hettinger | bfef18c | 2003-05-23 03:55:42 +0000 | [diff] [blame] | 1362 | 0, /* tp_alloc */ |
Raymond Hettinger | 61fe64d | 2003-02-23 04:40:07 +0000 | [diff] [blame] | 1363 | chain_new, /* tp_new */ |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1364 | PyObject_GC_Del, /* tp_free */ |
| 1365 | }; |
| 1366 | |
| 1367 | |
| 1368 | /* ifilter object ************************************************************/ |
| 1369 | |
| 1370 | typedef struct { |
| 1371 | PyObject_HEAD |
| 1372 | PyObject *func; |
| 1373 | PyObject *it; |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1374 | } ifilterobject; |
| 1375 | |
Raymond Hettinger | 1d7a348 | 2003-07-14 07:07:12 +0000 | [diff] [blame] | 1376 | static PyTypeObject ifilter_type; |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1377 | |
| 1378 | static PyObject * |
| 1379 | ifilter_new(PyTypeObject *type, PyObject *args, PyObject *kwds) |
| 1380 | { |
Raymond Hettinger | 60eca93 | 2003-02-09 06:40:58 +0000 | [diff] [blame] | 1381 | PyObject *func, *seq; |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1382 | PyObject *it; |
| 1383 | ifilterobject *lz; |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1384 | |
Raymond Hettinger | 60eca93 | 2003-02-09 06:40:58 +0000 | [diff] [blame] | 1385 | if (!PyArg_UnpackTuple(args, "ifilter", 2, 2, &func, &seq)) |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1386 | return NULL; |
| 1387 | |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1388 | /* Get iterator. */ |
| 1389 | it = PyObject_GetIter(seq); |
| 1390 | if (it == NULL) |
| 1391 | return NULL; |
| 1392 | |
| 1393 | /* create ifilterobject structure */ |
| 1394 | lz = (ifilterobject *)type->tp_alloc(type, 0); |
| 1395 | if (lz == NULL) { |
| 1396 | Py_DECREF(it); |
| 1397 | return NULL; |
| 1398 | } |
| 1399 | Py_INCREF(func); |
| 1400 | lz->func = func; |
| 1401 | lz->it = it; |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1402 | |
| 1403 | return (PyObject *)lz; |
| 1404 | } |
| 1405 | |
| 1406 | static void |
| 1407 | ifilter_dealloc(ifilterobject *lz) |
| 1408 | { |
| 1409 | PyObject_GC_UnTrack(lz); |
| 1410 | Py_XDECREF(lz->func); |
| 1411 | Py_XDECREF(lz->it); |
| 1412 | lz->ob_type->tp_free(lz); |
| 1413 | } |
| 1414 | |
| 1415 | static int |
| 1416 | ifilter_traverse(ifilterobject *lz, visitproc visit, void *arg) |
| 1417 | { |
| 1418 | int err; |
| 1419 | |
| 1420 | if (lz->it) { |
| 1421 | err = visit(lz->it, arg); |
| 1422 | if (err) |
| 1423 | return err; |
| 1424 | } |
| 1425 | if (lz->func) { |
| 1426 | err = visit(lz->func, arg); |
| 1427 | if (err) |
| 1428 | return err; |
| 1429 | } |
| 1430 | return 0; |
| 1431 | } |
| 1432 | |
| 1433 | static PyObject * |
| 1434 | ifilter_next(ifilterobject *lz) |
| 1435 | { |
| 1436 | PyObject *item; |
Raymond Hettinger | d1a283b | 2003-03-01 01:48:24 +0000 | [diff] [blame] | 1437 | PyObject *it = lz->it; |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1438 | long ok; |
| 1439 | |
| 1440 | for (;;) { |
Raymond Hettinger | d1a283b | 2003-03-01 01:48:24 +0000 | [diff] [blame] | 1441 | assert(PyIter_Check(it)); |
| 1442 | item = (*it->ob_type->tp_iternext)(it); |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1443 | if (item == NULL) |
| 1444 | return NULL; |
| 1445 | |
| 1446 | if (lz->func == Py_None) { |
| 1447 | ok = PyObject_IsTrue(item); |
| 1448 | } else { |
| 1449 | PyObject *good; |
| 1450 | good = PyObject_CallFunctionObjArgs(lz->func, |
| 1451 | item, NULL); |
| 1452 | if (good == NULL) { |
| 1453 | Py_DECREF(item); |
| 1454 | return NULL; |
| 1455 | } |
| 1456 | ok = PyObject_IsTrue(good); |
| 1457 | Py_DECREF(good); |
| 1458 | } |
Raymond Hettinger | 60eca93 | 2003-02-09 06:40:58 +0000 | [diff] [blame] | 1459 | if (ok) |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1460 | return item; |
| 1461 | Py_DECREF(item); |
| 1462 | } |
| 1463 | } |
| 1464 | |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1465 | PyDoc_STRVAR(ifilter_doc, |
Raymond Hettinger | 60eca93 | 2003-02-09 06:40:58 +0000 | [diff] [blame] | 1466 | "ifilter(function or None, sequence) --> ifilter object\n\ |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1467 | \n\ |
Raymond Hettinger | 60eca93 | 2003-02-09 06:40:58 +0000 | [diff] [blame] | 1468 | Return those items of sequence for which function(item) is true.\n\ |
| 1469 | If function is None, return the items that are true."); |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1470 | |
Raymond Hettinger | 1d7a348 | 2003-07-14 07:07:12 +0000 | [diff] [blame] | 1471 | static PyTypeObject ifilter_type = { |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1472 | PyObject_HEAD_INIT(NULL) |
| 1473 | 0, /* ob_size */ |
Raymond Hettinger | 60eca93 | 2003-02-09 06:40:58 +0000 | [diff] [blame] | 1474 | "itertools.ifilter", /* tp_name */ |
| 1475 | sizeof(ifilterobject), /* tp_basicsize */ |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1476 | 0, /* tp_itemsize */ |
| 1477 | /* methods */ |
Raymond Hettinger | 60eca93 | 2003-02-09 06:40:58 +0000 | [diff] [blame] | 1478 | (destructor)ifilter_dealloc, /* tp_dealloc */ |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1479 | 0, /* tp_print */ |
| 1480 | 0, /* tp_getattr */ |
| 1481 | 0, /* tp_setattr */ |
| 1482 | 0, /* tp_compare */ |
| 1483 | 0, /* tp_repr */ |
| 1484 | 0, /* tp_as_number */ |
| 1485 | 0, /* tp_as_sequence */ |
| 1486 | 0, /* tp_as_mapping */ |
| 1487 | 0, /* tp_hash */ |
| 1488 | 0, /* tp_call */ |
| 1489 | 0, /* tp_str */ |
| 1490 | PyObject_GenericGetAttr, /* tp_getattro */ |
| 1491 | 0, /* tp_setattro */ |
| 1492 | 0, /* tp_as_buffer */ |
| 1493 | Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC | |
| 1494 | Py_TPFLAGS_BASETYPE, /* tp_flags */ |
Raymond Hettinger | 60eca93 | 2003-02-09 06:40:58 +0000 | [diff] [blame] | 1495 | ifilter_doc, /* tp_doc */ |
| 1496 | (traverseproc)ifilter_traverse, /* tp_traverse */ |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1497 | 0, /* tp_clear */ |
| 1498 | 0, /* tp_richcompare */ |
| 1499 | 0, /* tp_weaklistoffset */ |
Raymond Hettinger | 1da1dbf | 2003-03-17 19:46:11 +0000 | [diff] [blame] | 1500 | PyObject_SelfIter, /* tp_iter */ |
Raymond Hettinger | 60eca93 | 2003-02-09 06:40:58 +0000 | [diff] [blame] | 1501 | (iternextfunc)ifilter_next, /* tp_iternext */ |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1502 | 0, /* tp_methods */ |
| 1503 | 0, /* tp_members */ |
| 1504 | 0, /* tp_getset */ |
| 1505 | 0, /* tp_base */ |
| 1506 | 0, /* tp_dict */ |
| 1507 | 0, /* tp_descr_get */ |
| 1508 | 0, /* tp_descr_set */ |
| 1509 | 0, /* tp_dictoffset */ |
| 1510 | 0, /* tp_init */ |
Raymond Hettinger | bfef18c | 2003-05-23 03:55:42 +0000 | [diff] [blame] | 1511 | 0, /* tp_alloc */ |
Raymond Hettinger | 60eca93 | 2003-02-09 06:40:58 +0000 | [diff] [blame] | 1512 | ifilter_new, /* tp_new */ |
| 1513 | PyObject_GC_Del, /* tp_free */ |
| 1514 | }; |
| 1515 | |
| 1516 | |
| 1517 | /* ifilterfalse object ************************************************************/ |
| 1518 | |
| 1519 | typedef struct { |
| 1520 | PyObject_HEAD |
| 1521 | PyObject *func; |
| 1522 | PyObject *it; |
| 1523 | } ifilterfalseobject; |
| 1524 | |
Raymond Hettinger | 1d7a348 | 2003-07-14 07:07:12 +0000 | [diff] [blame] | 1525 | static PyTypeObject ifilterfalse_type; |
Raymond Hettinger | 60eca93 | 2003-02-09 06:40:58 +0000 | [diff] [blame] | 1526 | |
| 1527 | static PyObject * |
| 1528 | ifilterfalse_new(PyTypeObject *type, PyObject *args, PyObject *kwds) |
| 1529 | { |
Guido van Rossum | d58f3fc | 2003-02-09 17:19:18 +0000 | [diff] [blame] | 1530 | PyObject *func, *seq; |
Raymond Hettinger | 60eca93 | 2003-02-09 06:40:58 +0000 | [diff] [blame] | 1531 | PyObject *it; |
| 1532 | ifilterfalseobject *lz; |
| 1533 | |
| 1534 | if (!PyArg_UnpackTuple(args, "ifilterfalse", 2, 2, &func, &seq)) |
| 1535 | return NULL; |
| 1536 | |
| 1537 | /* Get iterator. */ |
| 1538 | it = PyObject_GetIter(seq); |
| 1539 | if (it == NULL) |
| 1540 | return NULL; |
| 1541 | |
| 1542 | /* create ifilterfalseobject structure */ |
| 1543 | lz = (ifilterfalseobject *)type->tp_alloc(type, 0); |
| 1544 | if (lz == NULL) { |
| 1545 | Py_DECREF(it); |
| 1546 | return NULL; |
| 1547 | } |
| 1548 | Py_INCREF(func); |
| 1549 | lz->func = func; |
| 1550 | lz->it = it; |
| 1551 | |
| 1552 | return (PyObject *)lz; |
| 1553 | } |
| 1554 | |
| 1555 | static void |
| 1556 | ifilterfalse_dealloc(ifilterfalseobject *lz) |
| 1557 | { |
| 1558 | PyObject_GC_UnTrack(lz); |
| 1559 | Py_XDECREF(lz->func); |
| 1560 | Py_XDECREF(lz->it); |
| 1561 | lz->ob_type->tp_free(lz); |
| 1562 | } |
| 1563 | |
| 1564 | static int |
| 1565 | ifilterfalse_traverse(ifilterfalseobject *lz, visitproc visit, void *arg) |
| 1566 | { |
| 1567 | int err; |
| 1568 | |
| 1569 | if (lz->it) { |
| 1570 | err = visit(lz->it, arg); |
| 1571 | if (err) |
| 1572 | return err; |
| 1573 | } |
| 1574 | if (lz->func) { |
| 1575 | err = visit(lz->func, arg); |
| 1576 | if (err) |
| 1577 | return err; |
| 1578 | } |
| 1579 | return 0; |
| 1580 | } |
| 1581 | |
| 1582 | static PyObject * |
| 1583 | ifilterfalse_next(ifilterfalseobject *lz) |
| 1584 | { |
| 1585 | PyObject *item; |
Raymond Hettinger | d1a283b | 2003-03-01 01:48:24 +0000 | [diff] [blame] | 1586 | PyObject *it = lz->it; |
Raymond Hettinger | 60eca93 | 2003-02-09 06:40:58 +0000 | [diff] [blame] | 1587 | long ok; |
| 1588 | |
| 1589 | for (;;) { |
Raymond Hettinger | d1a283b | 2003-03-01 01:48:24 +0000 | [diff] [blame] | 1590 | assert(PyIter_Check(it)); |
| 1591 | item = (*it->ob_type->tp_iternext)(it); |
Raymond Hettinger | 60eca93 | 2003-02-09 06:40:58 +0000 | [diff] [blame] | 1592 | if (item == NULL) |
| 1593 | return NULL; |
| 1594 | |
| 1595 | if (lz->func == Py_None) { |
| 1596 | ok = PyObject_IsTrue(item); |
| 1597 | } else { |
| 1598 | PyObject *good; |
| 1599 | good = PyObject_CallFunctionObjArgs(lz->func, |
| 1600 | item, NULL); |
| 1601 | if (good == NULL) { |
| 1602 | Py_DECREF(item); |
| 1603 | return NULL; |
| 1604 | } |
| 1605 | ok = PyObject_IsTrue(good); |
| 1606 | Py_DECREF(good); |
| 1607 | } |
| 1608 | if (!ok) |
| 1609 | return item; |
| 1610 | Py_DECREF(item); |
| 1611 | } |
| 1612 | } |
| 1613 | |
Raymond Hettinger | 60eca93 | 2003-02-09 06:40:58 +0000 | [diff] [blame] | 1614 | PyDoc_STRVAR(ifilterfalse_doc, |
| 1615 | "ifilterfalse(function or None, sequence) --> ifilterfalse object\n\ |
| 1616 | \n\ |
| 1617 | Return those items of sequence for which function(item) is false.\n\ |
| 1618 | If function is None, return the items that are false."); |
| 1619 | |
Raymond Hettinger | 1d7a348 | 2003-07-14 07:07:12 +0000 | [diff] [blame] | 1620 | static PyTypeObject ifilterfalse_type = { |
Raymond Hettinger | 60eca93 | 2003-02-09 06:40:58 +0000 | [diff] [blame] | 1621 | PyObject_HEAD_INIT(NULL) |
| 1622 | 0, /* ob_size */ |
| 1623 | "itertools.ifilterfalse", /* tp_name */ |
| 1624 | sizeof(ifilterfalseobject), /* tp_basicsize */ |
| 1625 | 0, /* tp_itemsize */ |
| 1626 | /* methods */ |
| 1627 | (destructor)ifilterfalse_dealloc, /* tp_dealloc */ |
| 1628 | 0, /* tp_print */ |
| 1629 | 0, /* tp_getattr */ |
| 1630 | 0, /* tp_setattr */ |
| 1631 | 0, /* tp_compare */ |
| 1632 | 0, /* tp_repr */ |
| 1633 | 0, /* tp_as_number */ |
| 1634 | 0, /* tp_as_sequence */ |
| 1635 | 0, /* tp_as_mapping */ |
| 1636 | 0, /* tp_hash */ |
| 1637 | 0, /* tp_call */ |
| 1638 | 0, /* tp_str */ |
| 1639 | PyObject_GenericGetAttr, /* tp_getattro */ |
| 1640 | 0, /* tp_setattro */ |
| 1641 | 0, /* tp_as_buffer */ |
| 1642 | Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC | |
| 1643 | Py_TPFLAGS_BASETYPE, /* tp_flags */ |
| 1644 | ifilterfalse_doc, /* tp_doc */ |
| 1645 | (traverseproc)ifilterfalse_traverse, /* tp_traverse */ |
| 1646 | 0, /* tp_clear */ |
| 1647 | 0, /* tp_richcompare */ |
| 1648 | 0, /* tp_weaklistoffset */ |
Raymond Hettinger | 1da1dbf | 2003-03-17 19:46:11 +0000 | [diff] [blame] | 1649 | PyObject_SelfIter, /* tp_iter */ |
Raymond Hettinger | 60eca93 | 2003-02-09 06:40:58 +0000 | [diff] [blame] | 1650 | (iternextfunc)ifilterfalse_next, /* tp_iternext */ |
| 1651 | 0, /* tp_methods */ |
| 1652 | 0, /* tp_members */ |
| 1653 | 0, /* tp_getset */ |
| 1654 | 0, /* tp_base */ |
| 1655 | 0, /* tp_dict */ |
| 1656 | 0, /* tp_descr_get */ |
| 1657 | 0, /* tp_descr_set */ |
| 1658 | 0, /* tp_dictoffset */ |
| 1659 | 0, /* tp_init */ |
Raymond Hettinger | bfef18c | 2003-05-23 03:55:42 +0000 | [diff] [blame] | 1660 | 0, /* tp_alloc */ |
Raymond Hettinger | 60eca93 | 2003-02-09 06:40:58 +0000 | [diff] [blame] | 1661 | ifilterfalse_new, /* tp_new */ |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1662 | PyObject_GC_Del, /* tp_free */ |
| 1663 | }; |
| 1664 | |
| 1665 | |
| 1666 | /* count object ************************************************************/ |
| 1667 | |
| 1668 | typedef struct { |
| 1669 | PyObject_HEAD |
| 1670 | long cnt; |
| 1671 | } countobject; |
| 1672 | |
Raymond Hettinger | 1d7a348 | 2003-07-14 07:07:12 +0000 | [diff] [blame] | 1673 | static PyTypeObject count_type; |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1674 | |
| 1675 | static PyObject * |
| 1676 | count_new(PyTypeObject *type, PyObject *args, PyObject *kwds) |
| 1677 | { |
| 1678 | countobject *lz; |
| 1679 | long cnt = 0; |
| 1680 | |
| 1681 | if (!PyArg_ParseTuple(args, "|l:count", &cnt)) |
| 1682 | return NULL; |
| 1683 | |
| 1684 | /* create countobject structure */ |
| 1685 | lz = (countobject *)PyObject_New(countobject, &count_type); |
| 1686 | if (lz == NULL) |
| 1687 | return NULL; |
| 1688 | lz->cnt = cnt; |
| 1689 | |
| 1690 | return (PyObject *)lz; |
| 1691 | } |
| 1692 | |
| 1693 | static PyObject * |
| 1694 | count_next(countobject *lz) |
| 1695 | { |
| 1696 | return PyInt_FromLong(lz->cnt++); |
| 1697 | } |
| 1698 | |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1699 | PyDoc_STRVAR(count_doc, |
| 1700 | "count([firstval]) --> count object\n\ |
| 1701 | \n\ |
| 1702 | Return a count object whose .next() method returns consecutive\n\ |
| 1703 | integers starting from zero or, if specified, from firstval."); |
| 1704 | |
Raymond Hettinger | 1d7a348 | 2003-07-14 07:07:12 +0000 | [diff] [blame] | 1705 | static PyTypeObject count_type = { |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1706 | PyObject_HEAD_INIT(NULL) |
| 1707 | 0, /* ob_size */ |
Raymond Hettinger | 60eca93 | 2003-02-09 06:40:58 +0000 | [diff] [blame] | 1708 | "itertools.count", /* tp_name */ |
| 1709 | sizeof(countobject), /* tp_basicsize */ |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1710 | 0, /* tp_itemsize */ |
| 1711 | /* methods */ |
| 1712 | (destructor)PyObject_Del, /* tp_dealloc */ |
| 1713 | 0, /* tp_print */ |
| 1714 | 0, /* tp_getattr */ |
| 1715 | 0, /* tp_setattr */ |
| 1716 | 0, /* tp_compare */ |
| 1717 | 0, /* tp_repr */ |
| 1718 | 0, /* tp_as_number */ |
| 1719 | 0, /* tp_as_sequence */ |
| 1720 | 0, /* tp_as_mapping */ |
| 1721 | 0, /* tp_hash */ |
| 1722 | 0, /* tp_call */ |
| 1723 | 0, /* tp_str */ |
| 1724 | PyObject_GenericGetAttr, /* tp_getattro */ |
| 1725 | 0, /* tp_setattro */ |
| 1726 | 0, /* tp_as_buffer */ |
| 1727 | Py_TPFLAGS_DEFAULT, /* tp_flags */ |
Raymond Hettinger | 60eca93 | 2003-02-09 06:40:58 +0000 | [diff] [blame] | 1728 | count_doc, /* tp_doc */ |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1729 | 0, /* tp_traverse */ |
| 1730 | 0, /* tp_clear */ |
| 1731 | 0, /* tp_richcompare */ |
| 1732 | 0, /* tp_weaklistoffset */ |
Raymond Hettinger | 1da1dbf | 2003-03-17 19:46:11 +0000 | [diff] [blame] | 1733 | PyObject_SelfIter, /* tp_iter */ |
Raymond Hettinger | 60eca93 | 2003-02-09 06:40:58 +0000 | [diff] [blame] | 1734 | (iternextfunc)count_next, /* tp_iternext */ |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1735 | 0, /* tp_methods */ |
| 1736 | 0, /* tp_members */ |
| 1737 | 0, /* tp_getset */ |
| 1738 | 0, /* tp_base */ |
| 1739 | 0, /* tp_dict */ |
| 1740 | 0, /* tp_descr_get */ |
| 1741 | 0, /* tp_descr_set */ |
| 1742 | 0, /* tp_dictoffset */ |
| 1743 | 0, /* tp_init */ |
Raymond Hettinger | bfef18c | 2003-05-23 03:55:42 +0000 | [diff] [blame] | 1744 | 0, /* tp_alloc */ |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1745 | count_new, /* tp_new */ |
| 1746 | }; |
| 1747 | |
| 1748 | |
| 1749 | /* izip object ************************************************************/ |
| 1750 | |
| 1751 | #include "Python.h" |
| 1752 | |
| 1753 | typedef struct { |
| 1754 | PyObject_HEAD |
| 1755 | long tuplesize; |
| 1756 | PyObject *ittuple; /* tuple of iterators */ |
Raymond Hettinger | 2012f17 | 2003-02-07 05:32:58 +0000 | [diff] [blame] | 1757 | PyObject *result; |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1758 | } izipobject; |
| 1759 | |
Raymond Hettinger | 1d7a348 | 2003-07-14 07:07:12 +0000 | [diff] [blame] | 1760 | static PyTypeObject izip_type; |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1761 | |
| 1762 | static PyObject * |
| 1763 | izip_new(PyTypeObject *type, PyObject *args, PyObject *kwds) |
| 1764 | { |
| 1765 | izipobject *lz; |
| 1766 | int i; |
| 1767 | PyObject *ittuple; /* tuple of iterators */ |
Raymond Hettinger | 2012f17 | 2003-02-07 05:32:58 +0000 | [diff] [blame] | 1768 | PyObject *result; |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1769 | int tuplesize = PySequence_Length(args); |
| 1770 | |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1771 | /* args must be a tuple */ |
| 1772 | assert(PyTuple_Check(args)); |
| 1773 | |
| 1774 | /* obtain iterators */ |
| 1775 | ittuple = PyTuple_New(tuplesize); |
| 1776 | if(ittuple == NULL) |
| 1777 | return NULL; |
| 1778 | for (i=0; i < tuplesize; ++i) { |
| 1779 | PyObject *item = PyTuple_GET_ITEM(args, i); |
| 1780 | PyObject *it = PyObject_GetIter(item); |
| 1781 | if (it == NULL) { |
| 1782 | if (PyErr_ExceptionMatches(PyExc_TypeError)) |
| 1783 | PyErr_Format(PyExc_TypeError, |
| 1784 | "izip argument #%d must support iteration", |
| 1785 | i+1); |
| 1786 | Py_DECREF(ittuple); |
| 1787 | return NULL; |
| 1788 | } |
| 1789 | PyTuple_SET_ITEM(ittuple, i, it); |
| 1790 | } |
| 1791 | |
Raymond Hettinger | 2012f17 | 2003-02-07 05:32:58 +0000 | [diff] [blame] | 1792 | /* create a result holder */ |
| 1793 | result = PyTuple_New(tuplesize); |
| 1794 | if (result == NULL) { |
| 1795 | Py_DECREF(ittuple); |
| 1796 | return NULL; |
| 1797 | } |
| 1798 | for (i=0 ; i < tuplesize ; i++) { |
| 1799 | Py_INCREF(Py_None); |
| 1800 | PyTuple_SET_ITEM(result, i, Py_None); |
| 1801 | } |
| 1802 | |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1803 | /* create izipobject structure */ |
| 1804 | lz = (izipobject *)type->tp_alloc(type, 0); |
| 1805 | if (lz == NULL) { |
| 1806 | Py_DECREF(ittuple); |
Raymond Hettinger | 2012f17 | 2003-02-07 05:32:58 +0000 | [diff] [blame] | 1807 | Py_DECREF(result); |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1808 | return NULL; |
| 1809 | } |
| 1810 | lz->ittuple = ittuple; |
| 1811 | lz->tuplesize = tuplesize; |
Raymond Hettinger | 2012f17 | 2003-02-07 05:32:58 +0000 | [diff] [blame] | 1812 | lz->result = result; |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1813 | |
| 1814 | return (PyObject *)lz; |
| 1815 | } |
| 1816 | |
| 1817 | static void |
| 1818 | izip_dealloc(izipobject *lz) |
| 1819 | { |
| 1820 | PyObject_GC_UnTrack(lz); |
| 1821 | Py_XDECREF(lz->ittuple); |
Raymond Hettinger | 2012f17 | 2003-02-07 05:32:58 +0000 | [diff] [blame] | 1822 | Py_XDECREF(lz->result); |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1823 | lz->ob_type->tp_free(lz); |
| 1824 | } |
| 1825 | |
| 1826 | static int |
| 1827 | izip_traverse(izipobject *lz, visitproc visit, void *arg) |
| 1828 | { |
Raymond Hettinger | befa37d | 2003-06-18 19:25:37 +0000 | [diff] [blame] | 1829 | int err; |
| 1830 | |
| 1831 | if (lz->ittuple) { |
| 1832 | err = visit(lz->ittuple, arg); |
| 1833 | if (err) |
| 1834 | return err; |
| 1835 | } |
| 1836 | if (lz->result) { |
| 1837 | err = visit(lz->result, arg); |
| 1838 | if (err) |
| 1839 | return err; |
| 1840 | } |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1841 | return 0; |
| 1842 | } |
| 1843 | |
| 1844 | static PyObject * |
| 1845 | izip_next(izipobject *lz) |
| 1846 | { |
| 1847 | int i; |
| 1848 | long tuplesize = lz->tuplesize; |
Raymond Hettinger | 2012f17 | 2003-02-07 05:32:58 +0000 | [diff] [blame] | 1849 | PyObject *result = lz->result; |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1850 | PyObject *it; |
| 1851 | PyObject *item; |
Raymond Hettinger | 4f01f89 | 2003-08-30 00:10:06 +0000 | [diff] [blame] | 1852 | PyObject *olditem; |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1853 | |
Raymond Hettinger | b5a4208 | 2003-08-08 05:10:41 +0000 | [diff] [blame] | 1854 | if (tuplesize == 0) |
| 1855 | return NULL; |
Raymond Hettinger | 2012f17 | 2003-02-07 05:32:58 +0000 | [diff] [blame] | 1856 | if (result->ob_refcnt == 1) { |
Raymond Hettinger | a56f6b6 | 2003-08-29 23:09:58 +0000 | [diff] [blame] | 1857 | Py_INCREF(result); |
Raymond Hettinger | 2012f17 | 2003-02-07 05:32:58 +0000 | [diff] [blame] | 1858 | for (i=0 ; i < tuplesize ; i++) { |
Raymond Hettinger | f0c0024 | 2003-02-07 07:26:25 +0000 | [diff] [blame] | 1859 | it = PyTuple_GET_ITEM(lz->ittuple, i); |
Raymond Hettinger | d1a283b | 2003-03-01 01:48:24 +0000 | [diff] [blame] | 1860 | assert(PyIter_Check(it)); |
| 1861 | item = (*it->ob_type->tp_iternext)(it); |
Raymond Hettinger | a56f6b6 | 2003-08-29 23:09:58 +0000 | [diff] [blame] | 1862 | if (item == NULL) { |
| 1863 | Py_DECREF(result); |
Raymond Hettinger | f0c0024 | 2003-02-07 07:26:25 +0000 | [diff] [blame] | 1864 | return NULL; |
Raymond Hettinger | a56f6b6 | 2003-08-29 23:09:58 +0000 | [diff] [blame] | 1865 | } |
Raymond Hettinger | 4f01f89 | 2003-08-30 00:10:06 +0000 | [diff] [blame] | 1866 | olditem = PyTuple_GET_ITEM(result, i); |
Raymond Hettinger | f0c0024 | 2003-02-07 07:26:25 +0000 | [diff] [blame] | 1867 | PyTuple_SET_ITEM(result, i, item); |
Raymond Hettinger | 4f01f89 | 2003-08-30 00:10:06 +0000 | [diff] [blame] | 1868 | Py_DECREF(olditem); |
Raymond Hettinger | 2012f17 | 2003-02-07 05:32:58 +0000 | [diff] [blame] | 1869 | } |
Raymond Hettinger | 2012f17 | 2003-02-07 05:32:58 +0000 | [diff] [blame] | 1870 | } else { |
Raymond Hettinger | 2012f17 | 2003-02-07 05:32:58 +0000 | [diff] [blame] | 1871 | result = PyTuple_New(tuplesize); |
| 1872 | if (result == NULL) |
| 1873 | return NULL; |
Raymond Hettinger | f0c0024 | 2003-02-07 07:26:25 +0000 | [diff] [blame] | 1874 | for (i=0 ; i < tuplesize ; i++) { |
| 1875 | it = PyTuple_GET_ITEM(lz->ittuple, i); |
Raymond Hettinger | d1a283b | 2003-03-01 01:48:24 +0000 | [diff] [blame] | 1876 | assert(PyIter_Check(it)); |
| 1877 | item = (*it->ob_type->tp_iternext)(it); |
Raymond Hettinger | f0c0024 | 2003-02-07 07:26:25 +0000 | [diff] [blame] | 1878 | if (item == NULL) { |
| 1879 | Py_DECREF(result); |
| 1880 | return NULL; |
| 1881 | } |
| 1882 | PyTuple_SET_ITEM(result, i, item); |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1883 | } |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1884 | } |
| 1885 | return result; |
| 1886 | } |
| 1887 | |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1888 | PyDoc_STRVAR(izip_doc, |
| 1889 | "izip(iter1 [,iter2 [...]]) --> izip object\n\ |
| 1890 | \n\ |
| 1891 | Return a izip object whose .next() method returns a tuple where\n\ |
| 1892 | the i-th element comes from the i-th iterable argument. The .next()\n\ |
| 1893 | method continues until the shortest iterable in the argument sequence\n\ |
| 1894 | is exhausted and then it raises StopIteration. Works like the zip()\n\ |
| 1895 | function but consumes less memory by returning an iterator instead of\n\ |
| 1896 | a list."); |
| 1897 | |
Raymond Hettinger | 1d7a348 | 2003-07-14 07:07:12 +0000 | [diff] [blame] | 1898 | static PyTypeObject izip_type = { |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1899 | PyObject_HEAD_INIT(NULL) |
| 1900 | 0, /* ob_size */ |
Raymond Hettinger | 60eca93 | 2003-02-09 06:40:58 +0000 | [diff] [blame] | 1901 | "itertools.izip", /* tp_name */ |
| 1902 | sizeof(izipobject), /* tp_basicsize */ |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1903 | 0, /* tp_itemsize */ |
| 1904 | /* methods */ |
Raymond Hettinger | 60eca93 | 2003-02-09 06:40:58 +0000 | [diff] [blame] | 1905 | (destructor)izip_dealloc, /* tp_dealloc */ |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1906 | 0, /* tp_print */ |
| 1907 | 0, /* tp_getattr */ |
| 1908 | 0, /* tp_setattr */ |
| 1909 | 0, /* tp_compare */ |
| 1910 | 0, /* tp_repr */ |
| 1911 | 0, /* tp_as_number */ |
| 1912 | 0, /* tp_as_sequence */ |
| 1913 | 0, /* tp_as_mapping */ |
| 1914 | 0, /* tp_hash */ |
| 1915 | 0, /* tp_call */ |
| 1916 | 0, /* tp_str */ |
| 1917 | PyObject_GenericGetAttr, /* tp_getattro */ |
| 1918 | 0, /* tp_setattro */ |
| 1919 | 0, /* tp_as_buffer */ |
| 1920 | Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC | |
| 1921 | Py_TPFLAGS_BASETYPE, /* tp_flags */ |
Raymond Hettinger | 60eca93 | 2003-02-09 06:40:58 +0000 | [diff] [blame] | 1922 | izip_doc, /* tp_doc */ |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1923 | (traverseproc)izip_traverse, /* tp_traverse */ |
| 1924 | 0, /* tp_clear */ |
| 1925 | 0, /* tp_richcompare */ |
| 1926 | 0, /* tp_weaklistoffset */ |
Raymond Hettinger | 1da1dbf | 2003-03-17 19:46:11 +0000 | [diff] [blame] | 1927 | PyObject_SelfIter, /* tp_iter */ |
Raymond Hettinger | 60eca93 | 2003-02-09 06:40:58 +0000 | [diff] [blame] | 1928 | (iternextfunc)izip_next, /* tp_iternext */ |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1929 | 0, /* tp_methods */ |
| 1930 | 0, /* tp_members */ |
| 1931 | 0, /* tp_getset */ |
| 1932 | 0, /* tp_base */ |
| 1933 | 0, /* tp_dict */ |
| 1934 | 0, /* tp_descr_get */ |
| 1935 | 0, /* tp_descr_set */ |
| 1936 | 0, /* tp_dictoffset */ |
| 1937 | 0, /* tp_init */ |
Raymond Hettinger | bfef18c | 2003-05-23 03:55:42 +0000 | [diff] [blame] | 1938 | 0, /* tp_alloc */ |
Raymond Hettinger | 60eca93 | 2003-02-09 06:40:58 +0000 | [diff] [blame] | 1939 | izip_new, /* tp_new */ |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1940 | PyObject_GC_Del, /* tp_free */ |
| 1941 | }; |
| 1942 | |
| 1943 | |
| 1944 | /* repeat object ************************************************************/ |
| 1945 | |
| 1946 | typedef struct { |
| 1947 | PyObject_HEAD |
| 1948 | PyObject *element; |
Raymond Hettinger | 61fe64d | 2003-02-23 04:40:07 +0000 | [diff] [blame] | 1949 | long cnt; |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1950 | } repeatobject; |
| 1951 | |
Raymond Hettinger | 1d7a348 | 2003-07-14 07:07:12 +0000 | [diff] [blame] | 1952 | static PyTypeObject repeat_type; |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1953 | |
| 1954 | static PyObject * |
| 1955 | repeat_new(PyTypeObject *type, PyObject *args, PyObject *kwds) |
| 1956 | { |
| 1957 | repeatobject *ro; |
| 1958 | PyObject *element; |
Raymond Hettinger | 61fe64d | 2003-02-23 04:40:07 +0000 | [diff] [blame] | 1959 | long cnt = -1; |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1960 | |
Raymond Hettinger | 61fe64d | 2003-02-23 04:40:07 +0000 | [diff] [blame] | 1961 | if (!PyArg_ParseTuple(args, "O|l:repeat", &element, &cnt)) |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1962 | return NULL; |
| 1963 | |
Raymond Hettinger | 7c2bb5b | 2003-05-03 05:59:48 +0000 | [diff] [blame] | 1964 | if (PyTuple_Size(args) == 2 && cnt < 0) |
| 1965 | cnt = 0; |
| 1966 | |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1967 | ro = (repeatobject *)type->tp_alloc(type, 0); |
| 1968 | if (ro == NULL) |
| 1969 | return NULL; |
| 1970 | Py_INCREF(element); |
| 1971 | ro->element = element; |
Raymond Hettinger | 61fe64d | 2003-02-23 04:40:07 +0000 | [diff] [blame] | 1972 | ro->cnt = cnt; |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1973 | return (PyObject *)ro; |
| 1974 | } |
| 1975 | |
| 1976 | static void |
| 1977 | repeat_dealloc(repeatobject *ro) |
| 1978 | { |
| 1979 | PyObject_GC_UnTrack(ro); |
| 1980 | Py_XDECREF(ro->element); |
| 1981 | ro->ob_type->tp_free(ro); |
| 1982 | } |
| 1983 | |
| 1984 | static int |
| 1985 | repeat_traverse(repeatobject *ro, visitproc visit, void *arg) |
| 1986 | { |
| 1987 | if (ro->element) |
| 1988 | return visit(ro->element, arg); |
| 1989 | return 0; |
| 1990 | } |
| 1991 | |
| 1992 | static PyObject * |
| 1993 | repeat_next(repeatobject *ro) |
| 1994 | { |
Raymond Hettinger | 61fe64d | 2003-02-23 04:40:07 +0000 | [diff] [blame] | 1995 | if (ro->cnt == 0) |
| 1996 | return NULL; |
| 1997 | if (ro->cnt > 0) |
| 1998 | ro->cnt--; |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1999 | Py_INCREF(ro->element); |
| 2000 | return ro->element; |
| 2001 | } |
| 2002 | |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 2003 | PyDoc_STRVAR(repeat_doc, |
Raymond Hettinger | 61fe64d | 2003-02-23 04:40:07 +0000 | [diff] [blame] | 2004 | "repeat(element [,times]) -> create an iterator which returns the element\n\ |
| 2005 | for the specified number of times. If not specified, returns the element\n\ |
| 2006 | endlessly."); |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 2007 | |
Raymond Hettinger | 1d7a348 | 2003-07-14 07:07:12 +0000 | [diff] [blame] | 2008 | static PyTypeObject repeat_type = { |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 2009 | PyObject_HEAD_INIT(NULL) |
| 2010 | 0, /* ob_size */ |
| 2011 | "itertools.repeat", /* tp_name */ |
| 2012 | sizeof(repeatobject), /* tp_basicsize */ |
| 2013 | 0, /* tp_itemsize */ |
| 2014 | /* methods */ |
Raymond Hettinger | 60eca93 | 2003-02-09 06:40:58 +0000 | [diff] [blame] | 2015 | (destructor)repeat_dealloc, /* tp_dealloc */ |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 2016 | 0, /* tp_print */ |
| 2017 | 0, /* tp_getattr */ |
| 2018 | 0, /* tp_setattr */ |
| 2019 | 0, /* tp_compare */ |
| 2020 | 0, /* tp_repr */ |
| 2021 | 0, /* tp_as_number */ |
| 2022 | 0, /* tp_as_sequence */ |
| 2023 | 0, /* tp_as_mapping */ |
| 2024 | 0, /* tp_hash */ |
| 2025 | 0, /* tp_call */ |
| 2026 | 0, /* tp_str */ |
| 2027 | PyObject_GenericGetAttr, /* tp_getattro */ |
| 2028 | 0, /* tp_setattro */ |
| 2029 | 0, /* tp_as_buffer */ |
| 2030 | Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC | |
| 2031 | Py_TPFLAGS_BASETYPE, /* tp_flags */ |
Raymond Hettinger | 60eca93 | 2003-02-09 06:40:58 +0000 | [diff] [blame] | 2032 | repeat_doc, /* tp_doc */ |
| 2033 | (traverseproc)repeat_traverse, /* tp_traverse */ |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 2034 | 0, /* tp_clear */ |
| 2035 | 0, /* tp_richcompare */ |
| 2036 | 0, /* tp_weaklistoffset */ |
Raymond Hettinger | 1da1dbf | 2003-03-17 19:46:11 +0000 | [diff] [blame] | 2037 | PyObject_SelfIter, /* tp_iter */ |
Raymond Hettinger | 60eca93 | 2003-02-09 06:40:58 +0000 | [diff] [blame] | 2038 | (iternextfunc)repeat_next, /* tp_iternext */ |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 2039 | 0, /* tp_methods */ |
| 2040 | 0, /* tp_members */ |
| 2041 | 0, /* tp_getset */ |
| 2042 | 0, /* tp_base */ |
| 2043 | 0, /* tp_dict */ |
| 2044 | 0, /* tp_descr_get */ |
| 2045 | 0, /* tp_descr_set */ |
| 2046 | 0, /* tp_dictoffset */ |
| 2047 | 0, /* tp_init */ |
Raymond Hettinger | bfef18c | 2003-05-23 03:55:42 +0000 | [diff] [blame] | 2048 | 0, /* tp_alloc */ |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 2049 | repeat_new, /* tp_new */ |
| 2050 | PyObject_GC_Del, /* tp_free */ |
| 2051 | }; |
| 2052 | |
| 2053 | |
| 2054 | /* module level code ********************************************************/ |
| 2055 | |
| 2056 | PyDoc_STRVAR(module_doc, |
| 2057 | "Functional tools for creating and using iterators.\n\ |
| 2058 | \n\ |
| 2059 | Infinite iterators:\n\ |
| 2060 | count([n]) --> n, n+1, n+2, ...\n\ |
Raymond Hettinger | 61fe64d | 2003-02-23 04:40:07 +0000 | [diff] [blame] | 2061 | cycle(p) --> p0, p1, ... plast, p0, p1, ...\n\ |
Andrew M. Kuchling | dff694b | 2003-04-14 15:31:27 +0000 | [diff] [blame] | 2062 | repeat(elem [,n]) --> elem, elem, elem, ... endlessly or up to n times\n\ |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 2063 | \n\ |
| 2064 | Iterators terminating on the shortest input sequence:\n\ |
| 2065 | izip(p, q, ...) --> (p[0], q[0]), (p[1], q[1]), ... \n\ |
Raymond Hettinger | 60eca93 | 2003-02-09 06:40:58 +0000 | [diff] [blame] | 2066 | ifilter(pred, seq) --> elements of seq where pred(elem) is True\n\ |
| 2067 | ifilterfalse(pred, seq) --> elements of seq where pred(elem) is False\n\ |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 2068 | islice(seq, [start,] stop [, step]) --> elements from\n\ |
| 2069 | seq[start:stop:step]\n\ |
| 2070 | imap(fun, p, q, ...) --> fun(p0, q0), fun(p1, q1), ...\n\ |
| 2071 | starmap(fun, seq) --> fun(*seq[0]), fun(*seq[1]), ...\n\ |
Raymond Hettinger | 61fe64d | 2003-02-23 04:40:07 +0000 | [diff] [blame] | 2072 | chain(p, q, ...) --> p0, p1, ... plast, q0, q1, ... \n\ |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 2073 | takewhile(pred, seq) --> seq[0], seq[1], until pred fails\n\ |
| 2074 | dropwhile(pred, seq) --> seq[n], seq[n+1], starting when pred fails\n\ |
| 2075 | "); |
| 2076 | |
| 2077 | |
| 2078 | PyMODINIT_FUNC |
| 2079 | inititertools(void) |
| 2080 | { |
Raymond Hettinger | 60eca93 | 2003-02-09 06:40:58 +0000 | [diff] [blame] | 2081 | int i; |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 2082 | PyObject *m; |
Raymond Hettinger | 60eca93 | 2003-02-09 06:40:58 +0000 | [diff] [blame] | 2083 | char *name; |
| 2084 | PyTypeObject *typelist[] = { |
Raymond Hettinger | 6a5b027 | 2003-10-24 08:45:23 +0000 | [diff] [blame^] | 2085 | &tee_type, |
Raymond Hettinger | 61fe64d | 2003-02-23 04:40:07 +0000 | [diff] [blame] | 2086 | &cycle_type, |
Raymond Hettinger | 60eca93 | 2003-02-09 06:40:58 +0000 | [diff] [blame] | 2087 | &dropwhile_type, |
| 2088 | &takewhile_type, |
| 2089 | &islice_type, |
| 2090 | &starmap_type, |
| 2091 | &imap_type, |
Raymond Hettinger | 61fe64d | 2003-02-23 04:40:07 +0000 | [diff] [blame] | 2092 | &chain_type, |
Raymond Hettinger | 60eca93 | 2003-02-09 06:40:58 +0000 | [diff] [blame] | 2093 | &ifilter_type, |
| 2094 | &ifilterfalse_type, |
| 2095 | &count_type, |
| 2096 | &izip_type, |
| 2097 | &repeat_type, |
| 2098 | NULL |
| 2099 | }; |
| 2100 | |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 2101 | m = Py_InitModule3("itertools", NULL, module_doc); |
| 2102 | |
Raymond Hettinger | 60eca93 | 2003-02-09 06:40:58 +0000 | [diff] [blame] | 2103 | for (i=0 ; typelist[i] != NULL ; i++) { |
| 2104 | if (PyType_Ready(typelist[i]) < 0) |
| 2105 | return; |
Raymond Hettinger | d449eab | 2003-05-22 16:32:58 +0000 | [diff] [blame] | 2106 | name = strchr(typelist[i]->tp_name, '.'); |
Raymond Hettinger | 61fe64d | 2003-02-23 04:40:07 +0000 | [diff] [blame] | 2107 | assert (name != NULL); |
Raymond Hettinger | 60eca93 | 2003-02-09 06:40:58 +0000 | [diff] [blame] | 2108 | Py_INCREF(typelist[i]); |
Raymond Hettinger | d449eab | 2003-05-22 16:32:58 +0000 | [diff] [blame] | 2109 | PyModule_AddObject(m, name+1, (PyObject *)typelist[i]); |
Raymond Hettinger | 60eca93 | 2003-02-09 06:40:58 +0000 | [diff] [blame] | 2110 | } |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 2111 | } |