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 | ad983e7 | 2003-11-12 14:32:26 +0000 | [diff] [blame] | 10 | /* tee object and with supporting function and objects ***************/ |
Raymond Hettinger | 6a5b027 | 2003-10-24 08:45:23 +0000 | [diff] [blame] | 11 | |
Raymond Hettinger | ad983e7 | 2003-11-12 14:32:26 +0000 | [diff] [blame] | 12 | /* The teedataobject pre-allocates space for LINKCELLS number of objects. |
| 13 | To help the object fit neatly inside cache lines (space for 16 to 32 |
| 14 | pointers), the value should be a multiple of 16 minus space for |
| 15 | the other structure members including PyHEAD overhead. The larger the |
| 16 | value, the less memory overhead per object and the less time spent |
| 17 | allocating/deallocating new links. The smaller the number, the less |
| 18 | wasted space and the more rapid freeing of older data. |
Raymond Hettinger | 6a5b027 | 2003-10-24 08:45:23 +0000 | [diff] [blame] | 19 | */ |
Raymond Hettinger | ad983e7 | 2003-11-12 14:32:26 +0000 | [diff] [blame] | 20 | #define LINKCELLS 57 |
Raymond Hettinger | 6a5b027 | 2003-10-24 08:45:23 +0000 | [diff] [blame] | 21 | |
| 22 | typedef struct { |
| 23 | PyObject_HEAD |
| 24 | PyObject *it; |
Raymond Hettinger | ad983e7 | 2003-11-12 14:32:26 +0000 | [diff] [blame] | 25 | int numread; |
| 26 | PyObject *nextlink; |
| 27 | PyObject *(values[LINKCELLS]); |
| 28 | } teedataobject; |
Raymond Hettinger | 6a5b027 | 2003-10-24 08:45:23 +0000 | [diff] [blame] | 29 | |
| 30 | typedef struct { |
| 31 | PyObject_HEAD |
Raymond Hettinger | ad983e7 | 2003-11-12 14:32:26 +0000 | [diff] [blame] | 32 | teedataobject *dataobj; |
| 33 | int index; |
| 34 | } teeobject; |
Raymond Hettinger | 6a5b027 | 2003-10-24 08:45:23 +0000 | [diff] [blame] | 35 | |
Raymond Hettinger | ad983e7 | 2003-11-12 14:32:26 +0000 | [diff] [blame] | 36 | static PyTypeObject teedataobject_type; |
Raymond Hettinger | 6a5b027 | 2003-10-24 08:45:23 +0000 | [diff] [blame] | 37 | |
| 38 | static PyObject * |
Raymond Hettinger | ad983e7 | 2003-11-12 14:32:26 +0000 | [diff] [blame] | 39 | teedataobject_new(PyObject *it) |
Raymond Hettinger | 6a5b027 | 2003-10-24 08:45:23 +0000 | [diff] [blame] | 40 | { |
Raymond Hettinger | ad983e7 | 2003-11-12 14:32:26 +0000 | [diff] [blame] | 41 | teedataobject *tdo; |
Raymond Hettinger | 6a5b027 | 2003-10-24 08:45:23 +0000 | [diff] [blame] | 42 | |
Raymond Hettinger | ad983e7 | 2003-11-12 14:32:26 +0000 | [diff] [blame] | 43 | tdo = PyObject_New(teedataobject, &teedataobject_type); |
| 44 | if (tdo == NULL) |
Raymond Hettinger | 4514369 | 2003-10-25 06:37:47 +0000 | [diff] [blame] | 45 | return NULL; |
Raymond Hettinger | ad983e7 | 2003-11-12 14:32:26 +0000 | [diff] [blame] | 46 | |
| 47 | tdo->numread = 0; |
| 48 | tdo->nextlink = NULL; |
| 49 | Py_INCREF(it); |
| 50 | tdo->it = it; |
| 51 | return (PyObject *)tdo; |
| 52 | } |
| 53 | |
| 54 | static PyObject * |
| 55 | teedataobject_jumplink(teedataobject *tdo) |
| 56 | { |
| 57 | if (tdo->nextlink == NULL) |
| 58 | tdo->nextlink = teedataobject_new(tdo->it); |
| 59 | Py_INCREF(tdo->nextlink); |
| 60 | return tdo->nextlink; |
| 61 | } |
| 62 | |
| 63 | static PyObject * |
| 64 | teedataobject_getitem(teedataobject *tdo, int i) |
| 65 | { |
| 66 | PyObject *value; |
| 67 | |
| 68 | assert(i < LINKCELLS); |
| 69 | if (i < tdo->numread) |
| 70 | value = tdo->values[i]; |
| 71 | else { |
| 72 | /* this is the lead iterator, so fetch more data */ |
| 73 | assert(i == tdo->numread); |
| 74 | value = PyIter_Next(tdo->it); |
| 75 | if (value == NULL) |
| 76 | return NULL; |
| 77 | tdo->numread++; |
| 78 | tdo->values[i] = value; |
Raymond Hettinger | 4514369 | 2003-10-25 06:37:47 +0000 | [diff] [blame] | 79 | } |
Raymond Hettinger | ad983e7 | 2003-11-12 14:32:26 +0000 | [diff] [blame] | 80 | Py_INCREF(value); |
| 81 | return value; |
Raymond Hettinger | 6a5b027 | 2003-10-24 08:45:23 +0000 | [diff] [blame] | 82 | } |
| 83 | |
| 84 | static void |
Raymond Hettinger | ad983e7 | 2003-11-12 14:32:26 +0000 | [diff] [blame] | 85 | teedataobject_dealloc(teedataobject *tdo) |
Raymond Hettinger | 6a5b027 | 2003-10-24 08:45:23 +0000 | [diff] [blame] | 86 | { |
Raymond Hettinger | ad983e7 | 2003-11-12 14:32:26 +0000 | [diff] [blame] | 87 | int i; |
Raymond Hettinger | 4514369 | 2003-10-25 06:37:47 +0000 | [diff] [blame] | 88 | |
Raymond Hettinger | ad983e7 | 2003-11-12 14:32:26 +0000 | [diff] [blame] | 89 | for (i=0 ; i<tdo->numread ; i++) |
| 90 | Py_DECREF(tdo->values[i]); |
| 91 | Py_XDECREF(tdo->it); |
| 92 | Py_XDECREF(tdo->nextlink); |
| 93 | PyObject_Del(tdo); |
Raymond Hettinger | 6a5b027 | 2003-10-24 08:45:23 +0000 | [diff] [blame] | 94 | } |
| 95 | |
Raymond Hettinger | ad983e7 | 2003-11-12 14:32:26 +0000 | [diff] [blame] | 96 | PyDoc_STRVAR(teedataobject_doc, "Data container common to multiple tee objects."); |
Raymond Hettinger | 6a5b027 | 2003-10-24 08:45:23 +0000 | [diff] [blame] | 97 | |
Raymond Hettinger | ad983e7 | 2003-11-12 14:32:26 +0000 | [diff] [blame] | 98 | static PyTypeObject teedataobject_type = { |
Raymond Hettinger | 6a5b027 | 2003-10-24 08:45:23 +0000 | [diff] [blame] | 99 | PyObject_HEAD_INIT(&PyType_Type) |
| 100 | 0, /* ob_size */ |
Raymond Hettinger | ad983e7 | 2003-11-12 14:32:26 +0000 | [diff] [blame] | 101 | "itertools.tee_dataobject", /* tp_name */ |
| 102 | sizeof(teedataobject), /* tp_basicsize */ |
Raymond Hettinger | 6a5b027 | 2003-10-24 08:45:23 +0000 | [diff] [blame] | 103 | 0, /* tp_itemsize */ |
| 104 | /* methods */ |
Raymond Hettinger | ad983e7 | 2003-11-12 14:32:26 +0000 | [diff] [blame] | 105 | (destructor)teedataobject_dealloc, /* tp_dealloc */ |
Raymond Hettinger | 6a5b027 | 2003-10-24 08:45:23 +0000 | [diff] [blame] | 106 | 0, /* tp_print */ |
| 107 | 0, /* tp_getattr */ |
| 108 | 0, /* tp_setattr */ |
| 109 | 0, /* tp_compare */ |
| 110 | 0, /* tp_repr */ |
| 111 | 0, /* tp_as_number */ |
| 112 | 0, /* tp_as_sequence */ |
| 113 | 0, /* tp_as_mapping */ |
| 114 | 0, /* tp_hash */ |
| 115 | 0, /* tp_call */ |
| 116 | 0, /* tp_str */ |
| 117 | PyObject_GenericGetAttr, /* tp_getattro */ |
| 118 | 0, /* tp_setattro */ |
| 119 | 0, /* tp_as_buffer */ |
Raymond Hettinger | ad983e7 | 2003-11-12 14:32:26 +0000 | [diff] [blame] | 120 | Py_TPFLAGS_DEFAULT, /* tp_flags */ |
| 121 | teedataobject_doc, /* tp_doc */ |
| 122 | 0, /* tp_traverse */ |
Raymond Hettinger | 6a5b027 | 2003-10-24 08:45:23 +0000 | [diff] [blame] | 123 | }; |
| 124 | |
Raymond Hettinger | 6a5b027 | 2003-10-24 08:45:23 +0000 | [diff] [blame] | 125 | |
| 126 | static PyTypeObject tee_type; |
| 127 | |
| 128 | static PyObject * |
Raymond Hettinger | ad983e7 | 2003-11-12 14:32:26 +0000 | [diff] [blame] | 129 | tee_next(teeobject *to) |
Raymond Hettinger | 6a5b027 | 2003-10-24 08:45:23 +0000 | [diff] [blame] | 130 | { |
Raymond Hettinger | ad983e7 | 2003-11-12 14:32:26 +0000 | [diff] [blame] | 131 | PyObject *value, *link; |
| 132 | |
| 133 | if (to->index >= LINKCELLS) { |
| 134 | link = teedataobject_jumplink(to->dataobj); |
| 135 | Py_XDECREF(to->dataobj); |
| 136 | to->dataobj = (teedataobject *)link; |
| 137 | to->index = 0; |
| 138 | } |
| 139 | value = teedataobject_getitem(to->dataobj, to->index); |
| 140 | if (value == NULL) |
| 141 | return NULL; |
| 142 | to->index++; |
| 143 | return value; |
| 144 | } |
| 145 | |
| 146 | static PyObject * |
| 147 | tee_copy(teeobject *to) |
| 148 | { |
| 149 | teeobject *newto; |
| 150 | |
| 151 | newto = PyObject_New(teeobject, &tee_type); |
| 152 | if (newto == NULL) |
| 153 | return NULL; |
| 154 | Py_INCREF(to->dataobj); |
| 155 | newto->dataobj = to->dataobj; |
| 156 | newto->index = to->index; |
| 157 | return (PyObject *)newto; |
| 158 | } |
| 159 | |
| 160 | PyDoc_STRVAR(teecopy_doc, "Returns an independent iterator."); |
| 161 | |
| 162 | static PyObject * |
| 163 | tee_fromiterable(PyObject *iterable) |
| 164 | { |
| 165 | teeobject *to; |
Raymond Hettinger | 6a5b027 | 2003-10-24 08:45:23 +0000 | [diff] [blame] | 166 | PyObject *it = NULL; |
Raymond Hettinger | ad983e7 | 2003-11-12 14:32:26 +0000 | [diff] [blame] | 167 | |
| 168 | it = PyObject_GetIter(iterable); |
| 169 | if (it == NULL) |
| 170 | return NULL; |
| 171 | if (PyObject_TypeCheck(it, &tee_type)) { |
| 172 | to = (teeobject *)tee_copy((teeobject *)it); |
| 173 | goto done; |
| 174 | } |
| 175 | |
| 176 | to = PyObject_New(teeobject, &tee_type); |
| 177 | if (to == NULL) |
| 178 | goto done; |
| 179 | to->dataobj = (teedataobject *)teedataobject_new(it); |
| 180 | to->index = 0; |
| 181 | done: |
| 182 | Py_XDECREF(it); |
| 183 | return (PyObject *)to; |
| 184 | } |
| 185 | |
| 186 | static PyObject * |
| 187 | tee_new(PyTypeObject *type, PyObject *args, PyObject *kw) |
| 188 | { |
Raymond Hettinger | 6a5b027 | 2003-10-24 08:45:23 +0000 | [diff] [blame] | 189 | PyObject *iterable; |
Raymond Hettinger | 6a5b027 | 2003-10-24 08:45:23 +0000 | [diff] [blame] | 190 | |
| 191 | if (!PyArg_UnpackTuple(args, "tee", 1, 1, &iterable)) |
| 192 | return NULL; |
Raymond Hettinger | ad983e7 | 2003-11-12 14:32:26 +0000 | [diff] [blame] | 193 | return tee_fromiterable(iterable); |
Raymond Hettinger | 6a5b027 | 2003-10-24 08:45:23 +0000 | [diff] [blame] | 194 | } |
| 195 | |
| 196 | static void |
| 197 | tee_dealloc(teeobject *to) |
| 198 | { |
Raymond Hettinger | ad983e7 | 2003-11-12 14:32:26 +0000 | [diff] [blame] | 199 | Py_XDECREF(to->dataobj); |
| 200 | PyObject_Del(to); |
Raymond Hettinger | 6a5b027 | 2003-10-24 08:45:23 +0000 | [diff] [blame] | 201 | } |
| 202 | |
Raymond Hettinger | ad983e7 | 2003-11-12 14:32:26 +0000 | [diff] [blame] | 203 | PyDoc_STRVAR(teeobject_doc, |
| 204 | "Iterator wrapped to make it copyable"); |
Raymond Hettinger | 6a5b027 | 2003-10-24 08:45:23 +0000 | [diff] [blame] | 205 | |
Raymond Hettinger | ad983e7 | 2003-11-12 14:32:26 +0000 | [diff] [blame] | 206 | static PyMethodDef tee_methods[] = { |
| 207 | {"__copy__", (PyCFunction)tee_copy, METH_NOARGS, teecopy_doc}, |
| 208 | {NULL, NULL} /* sentinel */ |
| 209 | }; |
Raymond Hettinger | 6a5b027 | 2003-10-24 08:45:23 +0000 | [diff] [blame] | 210 | |
| 211 | static PyTypeObject tee_type = { |
| 212 | PyObject_HEAD_INIT(NULL) |
| 213 | 0, /* ob_size */ |
| 214 | "itertools.tee", /* tp_name */ |
| 215 | sizeof(teeobject), /* tp_basicsize */ |
| 216 | 0, /* tp_itemsize */ |
| 217 | /* methods */ |
| 218 | (destructor)tee_dealloc, /* tp_dealloc */ |
| 219 | 0, /* tp_print */ |
| 220 | 0, /* tp_getattr */ |
| 221 | 0, /* tp_setattr */ |
| 222 | 0, /* tp_compare */ |
| 223 | 0, /* tp_repr */ |
| 224 | 0, /* tp_as_number */ |
| 225 | 0, /* tp_as_sequence */ |
| 226 | 0, /* tp_as_mapping */ |
| 227 | 0, /* tp_hash */ |
| 228 | 0, /* tp_call */ |
| 229 | 0, /* tp_str */ |
Raymond Hettinger | f0c5aec | 2003-10-26 14:25:56 +0000 | [diff] [blame] | 230 | 0, /* tp_getattro */ |
Raymond Hettinger | 6a5b027 | 2003-10-24 08:45:23 +0000 | [diff] [blame] | 231 | 0, /* tp_setattro */ |
| 232 | 0, /* tp_as_buffer */ |
Raymond Hettinger | ad983e7 | 2003-11-12 14:32:26 +0000 | [diff] [blame] | 233 | Py_TPFLAGS_DEFAULT, /* tp_flags */ |
| 234 | teeobject_doc, /* tp_doc */ |
| 235 | 0, /* tp_traverse */ |
Raymond Hettinger | 6a5b027 | 2003-10-24 08:45:23 +0000 | [diff] [blame] | 236 | 0, /* tp_clear */ |
| 237 | 0, /* tp_richcompare */ |
| 238 | 0, /* tp_weaklistoffset */ |
Raymond Hettinger | ad983e7 | 2003-11-12 14:32:26 +0000 | [diff] [blame] | 239 | PyObject_SelfIter, /* tp_iter */ |
| 240 | (iternextfunc)tee_next, /* tp_iternext */ |
| 241 | tee_methods, /* tp_methods */ |
Raymond Hettinger | 6a5b027 | 2003-10-24 08:45:23 +0000 | [diff] [blame] | 242 | 0, /* tp_members */ |
| 243 | 0, /* tp_getset */ |
| 244 | 0, /* tp_base */ |
| 245 | 0, /* tp_dict */ |
| 246 | 0, /* tp_descr_get */ |
| 247 | 0, /* tp_descr_set */ |
| 248 | 0, /* tp_dictoffset */ |
| 249 | 0, /* tp_init */ |
| 250 | 0, /* tp_alloc */ |
| 251 | tee_new, /* tp_new */ |
Raymond Hettinger | ad983e7 | 2003-11-12 14:32:26 +0000 | [diff] [blame] | 252 | PyObject_Del, /* tp_free */ |
Raymond Hettinger | 6a5b027 | 2003-10-24 08:45:23 +0000 | [diff] [blame] | 253 | }; |
| 254 | |
Raymond Hettinger | ad983e7 | 2003-11-12 14:32:26 +0000 | [diff] [blame] | 255 | static PyObject * |
| 256 | tee(PyObject *self, PyObject *args) |
| 257 | { |
| 258 | int i, n=2; |
| 259 | PyObject *it, *iterable, *copyable, *result; |
| 260 | |
| 261 | if (!PyArg_ParseTuple(args, "O|i", &iterable, &n)) |
| 262 | return NULL; |
| 263 | result = PyTuple_New(n); |
| 264 | if (result == NULL) |
| 265 | return NULL; |
| 266 | if (n == 0) |
| 267 | return result; |
| 268 | it = PyObject_GetIter(iterable); |
| 269 | if (it == NULL) { |
| 270 | Py_DECREF(result); |
| 271 | return NULL; |
| 272 | } |
| 273 | if (!PyObject_HasAttrString(it, "__copy__")) { |
| 274 | copyable = tee_fromiterable(it); |
| 275 | Py_DECREF(it); |
| 276 | if (copyable == NULL) { |
| 277 | Py_DECREF(result); |
| 278 | return NULL; |
| 279 | } |
| 280 | } else |
| 281 | copyable = it; |
| 282 | PyTuple_SET_ITEM(result, 0, copyable); |
| 283 | for (i=1 ; i<n ; i++) { |
| 284 | copyable = PyObject_CallMethod(copyable, "__copy__", NULL); |
| 285 | if (copyable == NULL) { |
| 286 | Py_DECREF(result); |
| 287 | return NULL; |
| 288 | } |
| 289 | PyTuple_SET_ITEM(result, i, copyable); |
| 290 | } |
| 291 | return result; |
| 292 | } |
| 293 | |
| 294 | PyDoc_STRVAR(tee_doc, |
| 295 | "tee(iterable, n=2) --> tuple of n independent iterators."); |
| 296 | |
| 297 | |
Raymond Hettinger | 61fe64d | 2003-02-23 04:40:07 +0000 | [diff] [blame] | 298 | /* cycle object **********************************************************/ |
| 299 | |
| 300 | typedef struct { |
| 301 | PyObject_HEAD |
| 302 | PyObject *it; |
| 303 | PyObject *saved; |
| 304 | int firstpass; |
| 305 | } cycleobject; |
| 306 | |
Raymond Hettinger | 1d7a348 | 2003-07-14 07:07:12 +0000 | [diff] [blame] | 307 | static PyTypeObject cycle_type; |
Raymond Hettinger | 61fe64d | 2003-02-23 04:40:07 +0000 | [diff] [blame] | 308 | |
| 309 | static PyObject * |
| 310 | cycle_new(PyTypeObject *type, PyObject *args, PyObject *kwds) |
| 311 | { |
| 312 | PyObject *it; |
| 313 | PyObject *iterable; |
| 314 | PyObject *saved; |
| 315 | cycleobject *lz; |
| 316 | |
| 317 | if (!PyArg_UnpackTuple(args, "cycle", 1, 1, &iterable)) |
| 318 | return NULL; |
| 319 | |
| 320 | /* Get iterator. */ |
| 321 | it = PyObject_GetIter(iterable); |
| 322 | if (it == NULL) |
| 323 | return NULL; |
| 324 | |
| 325 | saved = PyList_New(0); |
| 326 | if (saved == NULL) { |
| 327 | Py_DECREF(it); |
| 328 | return NULL; |
| 329 | } |
| 330 | |
| 331 | /* create cycleobject structure */ |
| 332 | lz = (cycleobject *)type->tp_alloc(type, 0); |
| 333 | if (lz == NULL) { |
| 334 | Py_DECREF(it); |
| 335 | Py_DECREF(saved); |
| 336 | return NULL; |
| 337 | } |
| 338 | lz->it = it; |
| 339 | lz->saved = saved; |
| 340 | lz->firstpass = 0; |
| 341 | |
| 342 | return (PyObject *)lz; |
| 343 | } |
| 344 | |
| 345 | static void |
| 346 | cycle_dealloc(cycleobject *lz) |
| 347 | { |
| 348 | PyObject_GC_UnTrack(lz); |
| 349 | Py_XDECREF(lz->saved); |
| 350 | Py_XDECREF(lz->it); |
| 351 | lz->ob_type->tp_free(lz); |
| 352 | } |
| 353 | |
| 354 | static int |
| 355 | cycle_traverse(cycleobject *lz, visitproc visit, void *arg) |
| 356 | { |
| 357 | int err; |
| 358 | |
| 359 | if (lz->it) { |
| 360 | err = visit(lz->it, arg); |
| 361 | if (err) |
| 362 | return err; |
| 363 | } |
| 364 | if (lz->saved) { |
| 365 | err = visit(lz->saved, arg); |
| 366 | if (err) |
| 367 | return err; |
| 368 | } |
| 369 | return 0; |
| 370 | } |
| 371 | |
| 372 | static PyObject * |
| 373 | cycle_next(cycleobject *lz) |
| 374 | { |
| 375 | PyObject *item; |
| 376 | PyObject *it; |
| 377 | |
| 378 | while (1) { |
| 379 | item = PyIter_Next(lz->it); |
| 380 | if (item != NULL) { |
| 381 | if (!lz->firstpass) |
| 382 | PyList_Append(lz->saved, item); |
| 383 | return item; |
| 384 | } |
| 385 | if (PyList_Size(lz->saved) == 0) |
| 386 | return NULL; |
| 387 | it = PyObject_GetIter(lz->saved); |
| 388 | if (it == NULL) |
| 389 | return NULL; |
| 390 | Py_DECREF(lz->it); |
| 391 | lz->it = it; |
| 392 | lz->firstpass = 1; |
| 393 | } |
| 394 | } |
| 395 | |
Raymond Hettinger | 61fe64d | 2003-02-23 04:40:07 +0000 | [diff] [blame] | 396 | PyDoc_STRVAR(cycle_doc, |
| 397 | "cycle(iterable) --> cycle object\n\ |
| 398 | \n\ |
| 399 | Return elements from the iterable until it is exhausted.\n\ |
| 400 | Then repeat the sequence indefinitely."); |
| 401 | |
Raymond Hettinger | 1d7a348 | 2003-07-14 07:07:12 +0000 | [diff] [blame] | 402 | static PyTypeObject cycle_type = { |
Raymond Hettinger | 61fe64d | 2003-02-23 04:40:07 +0000 | [diff] [blame] | 403 | PyObject_HEAD_INIT(NULL) |
| 404 | 0, /* ob_size */ |
| 405 | "itertools.cycle", /* tp_name */ |
| 406 | sizeof(cycleobject), /* tp_basicsize */ |
| 407 | 0, /* tp_itemsize */ |
| 408 | /* methods */ |
| 409 | (destructor)cycle_dealloc, /* tp_dealloc */ |
| 410 | 0, /* tp_print */ |
| 411 | 0, /* tp_getattr */ |
| 412 | 0, /* tp_setattr */ |
| 413 | 0, /* tp_compare */ |
| 414 | 0, /* tp_repr */ |
| 415 | 0, /* tp_as_number */ |
| 416 | 0, /* tp_as_sequence */ |
| 417 | 0, /* tp_as_mapping */ |
| 418 | 0, /* tp_hash */ |
| 419 | 0, /* tp_call */ |
| 420 | 0, /* tp_str */ |
| 421 | PyObject_GenericGetAttr, /* tp_getattro */ |
| 422 | 0, /* tp_setattro */ |
| 423 | 0, /* tp_as_buffer */ |
| 424 | Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC | |
| 425 | Py_TPFLAGS_BASETYPE, /* tp_flags */ |
| 426 | cycle_doc, /* tp_doc */ |
| 427 | (traverseproc)cycle_traverse, /* tp_traverse */ |
| 428 | 0, /* tp_clear */ |
| 429 | 0, /* tp_richcompare */ |
| 430 | 0, /* tp_weaklistoffset */ |
Raymond Hettinger | 1da1dbf | 2003-03-17 19:46:11 +0000 | [diff] [blame] | 431 | PyObject_SelfIter, /* tp_iter */ |
Raymond Hettinger | 61fe64d | 2003-02-23 04:40:07 +0000 | [diff] [blame] | 432 | (iternextfunc)cycle_next, /* tp_iternext */ |
| 433 | 0, /* tp_methods */ |
| 434 | 0, /* tp_members */ |
| 435 | 0, /* tp_getset */ |
| 436 | 0, /* tp_base */ |
| 437 | 0, /* tp_dict */ |
| 438 | 0, /* tp_descr_get */ |
| 439 | 0, /* tp_descr_set */ |
| 440 | 0, /* tp_dictoffset */ |
| 441 | 0, /* tp_init */ |
Raymond Hettinger | bfef18c | 2003-05-23 03:55:42 +0000 | [diff] [blame] | 442 | 0, /* tp_alloc */ |
Raymond Hettinger | 61fe64d | 2003-02-23 04:40:07 +0000 | [diff] [blame] | 443 | cycle_new, /* tp_new */ |
| 444 | PyObject_GC_Del, /* tp_free */ |
| 445 | }; |
| 446 | |
| 447 | |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 448 | /* dropwhile object **********************************************************/ |
| 449 | |
| 450 | typedef struct { |
| 451 | PyObject_HEAD |
| 452 | PyObject *func; |
| 453 | PyObject *it; |
| 454 | long start; |
| 455 | } dropwhileobject; |
| 456 | |
Raymond Hettinger | 1d7a348 | 2003-07-14 07:07:12 +0000 | [diff] [blame] | 457 | static PyTypeObject dropwhile_type; |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 458 | |
| 459 | static PyObject * |
| 460 | dropwhile_new(PyTypeObject *type, PyObject *args, PyObject *kwds) |
| 461 | { |
| 462 | PyObject *func, *seq; |
| 463 | PyObject *it; |
| 464 | dropwhileobject *lz; |
| 465 | |
| 466 | if (!PyArg_UnpackTuple(args, "dropwhile", 2, 2, &func, &seq)) |
| 467 | return NULL; |
| 468 | |
| 469 | /* Get iterator. */ |
| 470 | it = PyObject_GetIter(seq); |
| 471 | if (it == NULL) |
| 472 | return NULL; |
| 473 | |
| 474 | /* create dropwhileobject structure */ |
| 475 | lz = (dropwhileobject *)type->tp_alloc(type, 0); |
| 476 | if (lz == NULL) { |
| 477 | Py_DECREF(it); |
| 478 | return NULL; |
| 479 | } |
| 480 | Py_INCREF(func); |
| 481 | lz->func = func; |
| 482 | lz->it = it; |
| 483 | lz->start = 0; |
| 484 | |
| 485 | return (PyObject *)lz; |
| 486 | } |
| 487 | |
| 488 | static void |
| 489 | dropwhile_dealloc(dropwhileobject *lz) |
| 490 | { |
| 491 | PyObject_GC_UnTrack(lz); |
| 492 | Py_XDECREF(lz->func); |
| 493 | Py_XDECREF(lz->it); |
| 494 | lz->ob_type->tp_free(lz); |
| 495 | } |
| 496 | |
| 497 | static int |
| 498 | dropwhile_traverse(dropwhileobject *lz, visitproc visit, void *arg) |
| 499 | { |
| 500 | int err; |
| 501 | |
| 502 | if (lz->it) { |
| 503 | err = visit(lz->it, arg); |
| 504 | if (err) |
| 505 | return err; |
| 506 | } |
| 507 | if (lz->func) { |
| 508 | err = visit(lz->func, arg); |
| 509 | if (err) |
| 510 | return err; |
| 511 | } |
| 512 | return 0; |
| 513 | } |
| 514 | |
| 515 | static PyObject * |
| 516 | dropwhile_next(dropwhileobject *lz) |
| 517 | { |
| 518 | PyObject *item, *good; |
Raymond Hettinger | d1a283b | 2003-03-01 01:48:24 +0000 | [diff] [blame] | 519 | PyObject *it = lz->it; |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 520 | long ok; |
| 521 | |
| 522 | for (;;) { |
Raymond Hettinger | d1a283b | 2003-03-01 01:48:24 +0000 | [diff] [blame] | 523 | assert(PyIter_Check(it)); |
| 524 | item = (*it->ob_type->tp_iternext)(it); |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 525 | if (item == NULL) |
| 526 | return NULL; |
| 527 | if (lz->start == 1) |
| 528 | return item; |
| 529 | |
| 530 | good = PyObject_CallFunctionObjArgs(lz->func, item, NULL); |
| 531 | if (good == NULL) { |
| 532 | Py_DECREF(item); |
| 533 | return NULL; |
| 534 | } |
| 535 | ok = PyObject_IsTrue(good); |
| 536 | Py_DECREF(good); |
| 537 | if (!ok) { |
| 538 | lz->start = 1; |
| 539 | return item; |
| 540 | } |
| 541 | Py_DECREF(item); |
| 542 | } |
| 543 | } |
| 544 | |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 545 | PyDoc_STRVAR(dropwhile_doc, |
| 546 | "dropwhile(predicate, iterable) --> dropwhile object\n\ |
| 547 | \n\ |
| 548 | Drop items from the iterable while predicate(item) is true.\n\ |
| 549 | Afterwards, return every element until the iterable is exhausted."); |
| 550 | |
Raymond Hettinger | 1d7a348 | 2003-07-14 07:07:12 +0000 | [diff] [blame] | 551 | static PyTypeObject dropwhile_type = { |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 552 | PyObject_HEAD_INIT(NULL) |
| 553 | 0, /* ob_size */ |
Raymond Hettinger | 60eca93 | 2003-02-09 06:40:58 +0000 | [diff] [blame] | 554 | "itertools.dropwhile", /* tp_name */ |
| 555 | sizeof(dropwhileobject), /* tp_basicsize */ |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 556 | 0, /* tp_itemsize */ |
| 557 | /* methods */ |
Raymond Hettinger | 60eca93 | 2003-02-09 06:40:58 +0000 | [diff] [blame] | 558 | (destructor)dropwhile_dealloc, /* tp_dealloc */ |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 559 | 0, /* tp_print */ |
| 560 | 0, /* tp_getattr */ |
| 561 | 0, /* tp_setattr */ |
| 562 | 0, /* tp_compare */ |
| 563 | 0, /* tp_repr */ |
| 564 | 0, /* tp_as_number */ |
| 565 | 0, /* tp_as_sequence */ |
| 566 | 0, /* tp_as_mapping */ |
| 567 | 0, /* tp_hash */ |
| 568 | 0, /* tp_call */ |
| 569 | 0, /* tp_str */ |
| 570 | PyObject_GenericGetAttr, /* tp_getattro */ |
| 571 | 0, /* tp_setattro */ |
| 572 | 0, /* tp_as_buffer */ |
| 573 | Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC | |
| 574 | Py_TPFLAGS_BASETYPE, /* tp_flags */ |
Raymond Hettinger | 60eca93 | 2003-02-09 06:40:58 +0000 | [diff] [blame] | 575 | dropwhile_doc, /* tp_doc */ |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 576 | (traverseproc)dropwhile_traverse, /* tp_traverse */ |
| 577 | 0, /* tp_clear */ |
| 578 | 0, /* tp_richcompare */ |
| 579 | 0, /* tp_weaklistoffset */ |
Raymond Hettinger | 1da1dbf | 2003-03-17 19:46:11 +0000 | [diff] [blame] | 580 | PyObject_SelfIter, /* tp_iter */ |
Raymond Hettinger | 60eca93 | 2003-02-09 06:40:58 +0000 | [diff] [blame] | 581 | (iternextfunc)dropwhile_next, /* tp_iternext */ |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 582 | 0, /* tp_methods */ |
| 583 | 0, /* tp_members */ |
| 584 | 0, /* tp_getset */ |
| 585 | 0, /* tp_base */ |
| 586 | 0, /* tp_dict */ |
| 587 | 0, /* tp_descr_get */ |
| 588 | 0, /* tp_descr_set */ |
| 589 | 0, /* tp_dictoffset */ |
| 590 | 0, /* tp_init */ |
Raymond Hettinger | bfef18c | 2003-05-23 03:55:42 +0000 | [diff] [blame] | 591 | 0, /* tp_alloc */ |
Raymond Hettinger | 60eca93 | 2003-02-09 06:40:58 +0000 | [diff] [blame] | 592 | dropwhile_new, /* tp_new */ |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 593 | PyObject_GC_Del, /* tp_free */ |
| 594 | }; |
| 595 | |
| 596 | |
| 597 | /* takewhile object **********************************************************/ |
| 598 | |
| 599 | typedef struct { |
| 600 | PyObject_HEAD |
| 601 | PyObject *func; |
| 602 | PyObject *it; |
| 603 | long stop; |
| 604 | } takewhileobject; |
| 605 | |
Raymond Hettinger | 1d7a348 | 2003-07-14 07:07:12 +0000 | [diff] [blame] | 606 | static PyTypeObject takewhile_type; |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 607 | |
| 608 | static PyObject * |
| 609 | takewhile_new(PyTypeObject *type, PyObject *args, PyObject *kwds) |
| 610 | { |
| 611 | PyObject *func, *seq; |
| 612 | PyObject *it; |
| 613 | takewhileobject *lz; |
| 614 | |
| 615 | if (!PyArg_UnpackTuple(args, "takewhile", 2, 2, &func, &seq)) |
| 616 | return NULL; |
| 617 | |
| 618 | /* Get iterator. */ |
| 619 | it = PyObject_GetIter(seq); |
| 620 | if (it == NULL) |
| 621 | return NULL; |
| 622 | |
| 623 | /* create takewhileobject structure */ |
| 624 | lz = (takewhileobject *)type->tp_alloc(type, 0); |
| 625 | if (lz == NULL) { |
| 626 | Py_DECREF(it); |
| 627 | return NULL; |
| 628 | } |
| 629 | Py_INCREF(func); |
| 630 | lz->func = func; |
| 631 | lz->it = it; |
| 632 | lz->stop = 0; |
| 633 | |
| 634 | return (PyObject *)lz; |
| 635 | } |
| 636 | |
| 637 | static void |
| 638 | takewhile_dealloc(takewhileobject *lz) |
| 639 | { |
| 640 | PyObject_GC_UnTrack(lz); |
| 641 | Py_XDECREF(lz->func); |
| 642 | Py_XDECREF(lz->it); |
| 643 | lz->ob_type->tp_free(lz); |
| 644 | } |
| 645 | |
| 646 | static int |
| 647 | takewhile_traverse(takewhileobject *lz, visitproc visit, void *arg) |
| 648 | { |
| 649 | int err; |
| 650 | |
| 651 | if (lz->it) { |
| 652 | err = visit(lz->it, arg); |
| 653 | if (err) |
| 654 | return err; |
| 655 | } |
| 656 | if (lz->func) { |
| 657 | err = visit(lz->func, arg); |
| 658 | if (err) |
| 659 | return err; |
| 660 | } |
| 661 | return 0; |
| 662 | } |
| 663 | |
| 664 | static PyObject * |
| 665 | takewhile_next(takewhileobject *lz) |
| 666 | { |
| 667 | PyObject *item, *good; |
Raymond Hettinger | d1a283b | 2003-03-01 01:48:24 +0000 | [diff] [blame] | 668 | PyObject *it = lz->it; |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 669 | long ok; |
| 670 | |
| 671 | if (lz->stop == 1) |
| 672 | return NULL; |
| 673 | |
Raymond Hettinger | d1a283b | 2003-03-01 01:48:24 +0000 | [diff] [blame] | 674 | assert(PyIter_Check(it)); |
| 675 | item = (*it->ob_type->tp_iternext)(it); |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 676 | if (item == NULL) |
| 677 | return NULL; |
| 678 | |
| 679 | good = PyObject_CallFunctionObjArgs(lz->func, item, NULL); |
| 680 | if (good == NULL) { |
| 681 | Py_DECREF(item); |
| 682 | return NULL; |
| 683 | } |
| 684 | ok = PyObject_IsTrue(good); |
| 685 | Py_DECREF(good); |
| 686 | if (ok) |
| 687 | return item; |
| 688 | Py_DECREF(item); |
| 689 | lz->stop = 1; |
| 690 | return NULL; |
| 691 | } |
| 692 | |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 693 | PyDoc_STRVAR(takewhile_doc, |
| 694 | "takewhile(predicate, iterable) --> takewhile object\n\ |
| 695 | \n\ |
| 696 | Return successive entries from an iterable as long as the \n\ |
| 697 | predicate evaluates to true for each entry."); |
| 698 | |
Raymond Hettinger | 1d7a348 | 2003-07-14 07:07:12 +0000 | [diff] [blame] | 699 | static PyTypeObject takewhile_type = { |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 700 | PyObject_HEAD_INIT(NULL) |
| 701 | 0, /* ob_size */ |
Raymond Hettinger | 60eca93 | 2003-02-09 06:40:58 +0000 | [diff] [blame] | 702 | "itertools.takewhile", /* tp_name */ |
| 703 | sizeof(takewhileobject), /* tp_basicsize */ |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 704 | 0, /* tp_itemsize */ |
| 705 | /* methods */ |
Raymond Hettinger | 60eca93 | 2003-02-09 06:40:58 +0000 | [diff] [blame] | 706 | (destructor)takewhile_dealloc, /* tp_dealloc */ |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 707 | 0, /* tp_print */ |
| 708 | 0, /* tp_getattr */ |
| 709 | 0, /* tp_setattr */ |
| 710 | 0, /* tp_compare */ |
| 711 | 0, /* tp_repr */ |
| 712 | 0, /* tp_as_number */ |
| 713 | 0, /* tp_as_sequence */ |
| 714 | 0, /* tp_as_mapping */ |
| 715 | 0, /* tp_hash */ |
| 716 | 0, /* tp_call */ |
| 717 | 0, /* tp_str */ |
| 718 | PyObject_GenericGetAttr, /* tp_getattro */ |
| 719 | 0, /* tp_setattro */ |
| 720 | 0, /* tp_as_buffer */ |
| 721 | Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC | |
| 722 | Py_TPFLAGS_BASETYPE, /* tp_flags */ |
Raymond Hettinger | 60eca93 | 2003-02-09 06:40:58 +0000 | [diff] [blame] | 723 | takewhile_doc, /* tp_doc */ |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 724 | (traverseproc)takewhile_traverse, /* tp_traverse */ |
| 725 | 0, /* tp_clear */ |
| 726 | 0, /* tp_richcompare */ |
| 727 | 0, /* tp_weaklistoffset */ |
Raymond Hettinger | 1da1dbf | 2003-03-17 19:46:11 +0000 | [diff] [blame] | 728 | PyObject_SelfIter, /* tp_iter */ |
Raymond Hettinger | 60eca93 | 2003-02-09 06:40:58 +0000 | [diff] [blame] | 729 | (iternextfunc)takewhile_next, /* tp_iternext */ |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 730 | 0, /* tp_methods */ |
| 731 | 0, /* tp_members */ |
| 732 | 0, /* tp_getset */ |
| 733 | 0, /* tp_base */ |
| 734 | 0, /* tp_dict */ |
| 735 | 0, /* tp_descr_get */ |
| 736 | 0, /* tp_descr_set */ |
| 737 | 0, /* tp_dictoffset */ |
| 738 | 0, /* tp_init */ |
Raymond Hettinger | bfef18c | 2003-05-23 03:55:42 +0000 | [diff] [blame] | 739 | 0, /* tp_alloc */ |
Raymond Hettinger | 60eca93 | 2003-02-09 06:40:58 +0000 | [diff] [blame] | 740 | takewhile_new, /* tp_new */ |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 741 | PyObject_GC_Del, /* tp_free */ |
| 742 | }; |
| 743 | |
| 744 | |
| 745 | /* islice object ************************************************************/ |
| 746 | |
| 747 | typedef struct { |
| 748 | PyObject_HEAD |
| 749 | PyObject *it; |
| 750 | long next; |
| 751 | long stop; |
| 752 | long step; |
| 753 | long cnt; |
| 754 | } isliceobject; |
| 755 | |
Raymond Hettinger | 1d7a348 | 2003-07-14 07:07:12 +0000 | [diff] [blame] | 756 | static PyTypeObject islice_type; |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 757 | |
| 758 | static PyObject * |
| 759 | islice_new(PyTypeObject *type, PyObject *args, PyObject *kwds) |
| 760 | { |
| 761 | PyObject *seq; |
Raymond Hettinger | 14ef54c | 2003-05-02 19:04:37 +0000 | [diff] [blame] | 762 | long start=0, stop=-1, step=1; |
| 763 | PyObject *it, *a1=NULL, *a2=NULL; |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 764 | int numargs; |
| 765 | isliceobject *lz; |
| 766 | |
| 767 | numargs = PyTuple_Size(args); |
Raymond Hettinger | 341deb7 | 2003-05-02 19:44:20 +0000 | [diff] [blame] | 768 | if (!PyArg_ParseTuple(args, "OO|Ol:islice", &seq, &a1, &a2, &step)) |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 769 | return NULL; |
| 770 | |
| 771 | if (numargs == 2) { |
Raymond Hettinger | 14ef54c | 2003-05-02 19:04:37 +0000 | [diff] [blame] | 772 | if (a1 != Py_None) { |
| 773 | stop = PyInt_AsLong(a1); |
| 774 | if (stop == -1) { |
| 775 | if (PyErr_Occurred()) |
| 776 | PyErr_Clear(); |
| 777 | PyErr_SetString(PyExc_ValueError, |
Raymond Hettinger | 0e4f764 | 2003-10-28 07:32:28 +0000 | [diff] [blame] | 778 | "Stop argument must be a non-negative integer or None."); |
Raymond Hettinger | 14ef54c | 2003-05-02 19:04:37 +0000 | [diff] [blame] | 779 | return NULL; |
| 780 | } |
| 781 | } |
Raymond Hettinger | 341deb7 | 2003-05-02 19:44:20 +0000 | [diff] [blame] | 782 | } else { |
Raymond Hettinger | 14ef54c | 2003-05-02 19:04:37 +0000 | [diff] [blame] | 783 | start = PyInt_AsLong(a1); |
| 784 | if (start == -1 && PyErr_Occurred()) { |
| 785 | PyErr_Clear(); |
| 786 | PyErr_SetString(PyExc_ValueError, |
Raymond Hettinger | 0e4f764 | 2003-10-28 07:32:28 +0000 | [diff] [blame] | 787 | "Start argument must be a non-negative integer."); |
Raymond Hettinger | 14ef54c | 2003-05-02 19:04:37 +0000 | [diff] [blame] | 788 | return NULL; |
| 789 | } |
| 790 | if (a2 != Py_None) { |
| 791 | stop = PyInt_AsLong(a2); |
| 792 | if (stop == -1) { |
| 793 | if (PyErr_Occurred()) |
| 794 | PyErr_Clear(); |
| 795 | PyErr_SetString(PyExc_ValueError, |
Raymond Hettinger | 0e4f764 | 2003-10-28 07:32:28 +0000 | [diff] [blame] | 796 | "Stop argument must be a non-negative integer or None."); |
Raymond Hettinger | 14ef54c | 2003-05-02 19:04:37 +0000 | [diff] [blame] | 797 | return NULL; |
| 798 | } |
| 799 | } |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 800 | } |
| 801 | |
Raymond Hettinger | 14ef54c | 2003-05-02 19:04:37 +0000 | [diff] [blame] | 802 | if (start<0 || stop<-1) { |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 803 | PyErr_SetString(PyExc_ValueError, |
Raymond Hettinger | 0e4f764 | 2003-10-28 07:32:28 +0000 | [diff] [blame] | 804 | "Indices for islice() must be non-negative integers."); |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 805 | return NULL; |
| 806 | } |
| 807 | |
| 808 | if (step<1) { |
| 809 | PyErr_SetString(PyExc_ValueError, |
| 810 | "Step must be one or larger for islice()."); |
| 811 | return NULL; |
| 812 | } |
| 813 | |
| 814 | /* Get iterator. */ |
| 815 | it = PyObject_GetIter(seq); |
| 816 | if (it == NULL) |
| 817 | return NULL; |
| 818 | |
| 819 | /* create isliceobject structure */ |
| 820 | lz = (isliceobject *)type->tp_alloc(type, 0); |
| 821 | if (lz == NULL) { |
| 822 | Py_DECREF(it); |
| 823 | return NULL; |
| 824 | } |
| 825 | lz->it = it; |
| 826 | lz->next = start; |
| 827 | lz->stop = stop; |
| 828 | lz->step = step; |
| 829 | lz->cnt = 0L; |
| 830 | |
| 831 | return (PyObject *)lz; |
| 832 | } |
| 833 | |
| 834 | static void |
| 835 | islice_dealloc(isliceobject *lz) |
| 836 | { |
| 837 | PyObject_GC_UnTrack(lz); |
| 838 | Py_XDECREF(lz->it); |
| 839 | lz->ob_type->tp_free(lz); |
| 840 | } |
| 841 | |
| 842 | static int |
| 843 | islice_traverse(isliceobject *lz, visitproc visit, void *arg) |
| 844 | { |
| 845 | if (lz->it) |
| 846 | return visit(lz->it, arg); |
| 847 | return 0; |
| 848 | } |
| 849 | |
| 850 | static PyObject * |
| 851 | islice_next(isliceobject *lz) |
| 852 | { |
| 853 | PyObject *item; |
Raymond Hettinger | d1a283b | 2003-03-01 01:48:24 +0000 | [diff] [blame] | 854 | PyObject *it = lz->it; |
Raymond Hettinger | 2012f17 | 2003-02-07 05:32:58 +0000 | [diff] [blame] | 855 | long oldnext; |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 856 | |
| 857 | while (lz->cnt < lz->next) { |
Raymond Hettinger | d1a283b | 2003-03-01 01:48:24 +0000 | [diff] [blame] | 858 | assert(PyIter_Check(it)); |
| 859 | item = (*it->ob_type->tp_iternext)(it); |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 860 | if (item == NULL) |
| 861 | return NULL; |
| 862 | Py_DECREF(item); |
| 863 | lz->cnt++; |
| 864 | } |
Raymond Hettinger | 14ef54c | 2003-05-02 19:04:37 +0000 | [diff] [blame] | 865 | if (lz->stop != -1 && lz->cnt >= lz->stop) |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 866 | return NULL; |
Raymond Hettinger | d1a283b | 2003-03-01 01:48:24 +0000 | [diff] [blame] | 867 | assert(PyIter_Check(it)); |
| 868 | item = (*it->ob_type->tp_iternext)(it); |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 869 | if (item == NULL) |
| 870 | return NULL; |
| 871 | lz->cnt++; |
Raymond Hettinger | 2012f17 | 2003-02-07 05:32:58 +0000 | [diff] [blame] | 872 | oldnext = lz->next; |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 873 | lz->next += lz->step; |
Raymond Hettinger | 2012f17 | 2003-02-07 05:32:58 +0000 | [diff] [blame] | 874 | if (lz->next < oldnext) /* Check for overflow */ |
| 875 | lz->next = lz->stop; |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 876 | return item; |
| 877 | } |
| 878 | |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 879 | PyDoc_STRVAR(islice_doc, |
| 880 | "islice(iterable, [start,] stop [, step]) --> islice object\n\ |
| 881 | \n\ |
| 882 | Return an iterator whose next() method returns selected values from an\n\ |
| 883 | iterable. If start is specified, will skip all preceding elements;\n\ |
| 884 | otherwise, start defaults to zero. Step defaults to one. If\n\ |
| 885 | specified as another value, step determines how many values are \n\ |
| 886 | skipped between successive calls. Works like a slice() on a list\n\ |
| 887 | but returns an iterator."); |
| 888 | |
Raymond Hettinger | 1d7a348 | 2003-07-14 07:07:12 +0000 | [diff] [blame] | 889 | static PyTypeObject islice_type = { |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 890 | PyObject_HEAD_INIT(NULL) |
| 891 | 0, /* ob_size */ |
| 892 | "itertools.islice", /* tp_name */ |
| 893 | sizeof(isliceobject), /* tp_basicsize */ |
| 894 | 0, /* tp_itemsize */ |
| 895 | /* methods */ |
Raymond Hettinger | 60eca93 | 2003-02-09 06:40:58 +0000 | [diff] [blame] | 896 | (destructor)islice_dealloc, /* tp_dealloc */ |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 897 | 0, /* tp_print */ |
| 898 | 0, /* tp_getattr */ |
| 899 | 0, /* tp_setattr */ |
| 900 | 0, /* tp_compare */ |
| 901 | 0, /* tp_repr */ |
| 902 | 0, /* tp_as_number */ |
| 903 | 0, /* tp_as_sequence */ |
| 904 | 0, /* tp_as_mapping */ |
| 905 | 0, /* tp_hash */ |
| 906 | 0, /* tp_call */ |
| 907 | 0, /* tp_str */ |
| 908 | PyObject_GenericGetAttr, /* tp_getattro */ |
| 909 | 0, /* tp_setattro */ |
| 910 | 0, /* tp_as_buffer */ |
| 911 | Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC | |
| 912 | Py_TPFLAGS_BASETYPE, /* tp_flags */ |
Raymond Hettinger | 60eca93 | 2003-02-09 06:40:58 +0000 | [diff] [blame] | 913 | islice_doc, /* tp_doc */ |
| 914 | (traverseproc)islice_traverse, /* tp_traverse */ |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 915 | 0, /* tp_clear */ |
| 916 | 0, /* tp_richcompare */ |
| 917 | 0, /* tp_weaklistoffset */ |
Raymond Hettinger | 1da1dbf | 2003-03-17 19:46:11 +0000 | [diff] [blame] | 918 | PyObject_SelfIter, /* tp_iter */ |
Raymond Hettinger | 60eca93 | 2003-02-09 06:40:58 +0000 | [diff] [blame] | 919 | (iternextfunc)islice_next, /* tp_iternext */ |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 920 | 0, /* tp_methods */ |
| 921 | 0, /* tp_members */ |
| 922 | 0, /* tp_getset */ |
| 923 | 0, /* tp_base */ |
| 924 | 0, /* tp_dict */ |
| 925 | 0, /* tp_descr_get */ |
| 926 | 0, /* tp_descr_set */ |
| 927 | 0, /* tp_dictoffset */ |
| 928 | 0, /* tp_init */ |
Raymond Hettinger | bfef18c | 2003-05-23 03:55:42 +0000 | [diff] [blame] | 929 | 0, /* tp_alloc */ |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 930 | islice_new, /* tp_new */ |
| 931 | PyObject_GC_Del, /* tp_free */ |
| 932 | }; |
| 933 | |
| 934 | |
| 935 | /* starmap object ************************************************************/ |
| 936 | |
| 937 | typedef struct { |
| 938 | PyObject_HEAD |
| 939 | PyObject *func; |
| 940 | PyObject *it; |
| 941 | } starmapobject; |
| 942 | |
Raymond Hettinger | 1d7a348 | 2003-07-14 07:07:12 +0000 | [diff] [blame] | 943 | static PyTypeObject starmap_type; |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 944 | |
| 945 | static PyObject * |
| 946 | starmap_new(PyTypeObject *type, PyObject *args, PyObject *kwds) |
| 947 | { |
| 948 | PyObject *func, *seq; |
| 949 | PyObject *it; |
| 950 | starmapobject *lz; |
| 951 | |
| 952 | if (!PyArg_UnpackTuple(args, "starmap", 2, 2, &func, &seq)) |
| 953 | return NULL; |
| 954 | |
| 955 | /* Get iterator. */ |
| 956 | it = PyObject_GetIter(seq); |
| 957 | if (it == NULL) |
| 958 | return NULL; |
| 959 | |
| 960 | /* create starmapobject structure */ |
| 961 | lz = (starmapobject *)type->tp_alloc(type, 0); |
| 962 | if (lz == NULL) { |
| 963 | Py_DECREF(it); |
| 964 | return NULL; |
| 965 | } |
| 966 | Py_INCREF(func); |
| 967 | lz->func = func; |
| 968 | lz->it = it; |
| 969 | |
| 970 | return (PyObject *)lz; |
| 971 | } |
| 972 | |
| 973 | static void |
| 974 | starmap_dealloc(starmapobject *lz) |
| 975 | { |
| 976 | PyObject_GC_UnTrack(lz); |
| 977 | Py_XDECREF(lz->func); |
| 978 | Py_XDECREF(lz->it); |
| 979 | lz->ob_type->tp_free(lz); |
| 980 | } |
| 981 | |
| 982 | static int |
| 983 | starmap_traverse(starmapobject *lz, visitproc visit, void *arg) |
| 984 | { |
| 985 | int err; |
| 986 | |
| 987 | if (lz->it) { |
| 988 | err = visit(lz->it, arg); |
| 989 | if (err) |
| 990 | return err; |
| 991 | } |
| 992 | if (lz->func) { |
| 993 | err = visit(lz->func, arg); |
| 994 | if (err) |
| 995 | return err; |
| 996 | } |
| 997 | return 0; |
| 998 | } |
| 999 | |
| 1000 | static PyObject * |
| 1001 | starmap_next(starmapobject *lz) |
| 1002 | { |
| 1003 | PyObject *args; |
| 1004 | PyObject *result; |
Raymond Hettinger | d1a283b | 2003-03-01 01:48:24 +0000 | [diff] [blame] | 1005 | PyObject *it = lz->it; |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1006 | |
Raymond Hettinger | d1a283b | 2003-03-01 01:48:24 +0000 | [diff] [blame] | 1007 | assert(PyIter_Check(it)); |
| 1008 | args = (*it->ob_type->tp_iternext)(it); |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1009 | if (args == NULL) |
| 1010 | return NULL; |
Raymond Hettinger | 2012f17 | 2003-02-07 05:32:58 +0000 | [diff] [blame] | 1011 | if (!PyTuple_CheckExact(args)) { |
| 1012 | Py_DECREF(args); |
| 1013 | PyErr_SetString(PyExc_TypeError, |
| 1014 | "iterator must return a tuple"); |
| 1015 | return NULL; |
| 1016 | } |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1017 | result = PyObject_Call(lz->func, args, NULL); |
| 1018 | Py_DECREF(args); |
| 1019 | return result; |
| 1020 | } |
| 1021 | |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1022 | PyDoc_STRVAR(starmap_doc, |
| 1023 | "starmap(function, sequence) --> starmap object\n\ |
| 1024 | \n\ |
| 1025 | Return an iterator whose values are returned from the function evaluated\n\ |
| 1026 | with a argument tuple taken from the given sequence."); |
| 1027 | |
Raymond Hettinger | 1d7a348 | 2003-07-14 07:07:12 +0000 | [diff] [blame] | 1028 | static PyTypeObject starmap_type = { |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1029 | PyObject_HEAD_INIT(NULL) |
| 1030 | 0, /* ob_size */ |
Raymond Hettinger | 60eca93 | 2003-02-09 06:40:58 +0000 | [diff] [blame] | 1031 | "itertools.starmap", /* tp_name */ |
| 1032 | sizeof(starmapobject), /* tp_basicsize */ |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1033 | 0, /* tp_itemsize */ |
| 1034 | /* methods */ |
Raymond Hettinger | 60eca93 | 2003-02-09 06:40:58 +0000 | [diff] [blame] | 1035 | (destructor)starmap_dealloc, /* tp_dealloc */ |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1036 | 0, /* tp_print */ |
| 1037 | 0, /* tp_getattr */ |
| 1038 | 0, /* tp_setattr */ |
| 1039 | 0, /* tp_compare */ |
| 1040 | 0, /* tp_repr */ |
| 1041 | 0, /* tp_as_number */ |
| 1042 | 0, /* tp_as_sequence */ |
| 1043 | 0, /* tp_as_mapping */ |
| 1044 | 0, /* tp_hash */ |
| 1045 | 0, /* tp_call */ |
| 1046 | 0, /* tp_str */ |
| 1047 | PyObject_GenericGetAttr, /* tp_getattro */ |
| 1048 | 0, /* tp_setattro */ |
| 1049 | 0, /* tp_as_buffer */ |
| 1050 | Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC | |
| 1051 | Py_TPFLAGS_BASETYPE, /* tp_flags */ |
Raymond Hettinger | 60eca93 | 2003-02-09 06:40:58 +0000 | [diff] [blame] | 1052 | starmap_doc, /* tp_doc */ |
| 1053 | (traverseproc)starmap_traverse, /* tp_traverse */ |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1054 | 0, /* tp_clear */ |
| 1055 | 0, /* tp_richcompare */ |
| 1056 | 0, /* tp_weaklistoffset */ |
Raymond Hettinger | 1da1dbf | 2003-03-17 19:46:11 +0000 | [diff] [blame] | 1057 | PyObject_SelfIter, /* tp_iter */ |
Raymond Hettinger | 60eca93 | 2003-02-09 06:40:58 +0000 | [diff] [blame] | 1058 | (iternextfunc)starmap_next, /* tp_iternext */ |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1059 | 0, /* tp_methods */ |
| 1060 | 0, /* tp_members */ |
| 1061 | 0, /* tp_getset */ |
| 1062 | 0, /* tp_base */ |
| 1063 | 0, /* tp_dict */ |
| 1064 | 0, /* tp_descr_get */ |
| 1065 | 0, /* tp_descr_set */ |
| 1066 | 0, /* tp_dictoffset */ |
| 1067 | 0, /* tp_init */ |
Raymond Hettinger | bfef18c | 2003-05-23 03:55:42 +0000 | [diff] [blame] | 1068 | 0, /* tp_alloc */ |
Raymond Hettinger | 60eca93 | 2003-02-09 06:40:58 +0000 | [diff] [blame] | 1069 | starmap_new, /* tp_new */ |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1070 | PyObject_GC_Del, /* tp_free */ |
| 1071 | }; |
| 1072 | |
| 1073 | |
| 1074 | /* imap object ************************************************************/ |
| 1075 | |
| 1076 | typedef struct { |
| 1077 | PyObject_HEAD |
| 1078 | PyObject *iters; |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1079 | PyObject *func; |
| 1080 | } imapobject; |
| 1081 | |
Raymond Hettinger | 1d7a348 | 2003-07-14 07:07:12 +0000 | [diff] [blame] | 1082 | static PyTypeObject imap_type; |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1083 | |
| 1084 | static PyObject * |
| 1085 | imap_new(PyTypeObject *type, PyObject *args, PyObject *kwds) |
| 1086 | { |
Raymond Hettinger | f0c0024 | 2003-02-07 07:26:25 +0000 | [diff] [blame] | 1087 | PyObject *it, *iters, *func; |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1088 | imapobject *lz; |
| 1089 | int numargs, i; |
| 1090 | |
| 1091 | numargs = PyTuple_Size(args); |
| 1092 | if (numargs < 2) { |
| 1093 | PyErr_SetString(PyExc_TypeError, |
| 1094 | "imap() must have at least two arguments."); |
| 1095 | return NULL; |
| 1096 | } |
| 1097 | |
| 1098 | iters = PyTuple_New(numargs-1); |
| 1099 | if (iters == NULL) |
| 1100 | return NULL; |
| 1101 | |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1102 | for (i=1 ; i<numargs ; i++) { |
| 1103 | /* Get iterator. */ |
| 1104 | it = PyObject_GetIter(PyTuple_GET_ITEM(args, i)); |
| 1105 | if (it == NULL) { |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1106 | Py_DECREF(iters); |
| 1107 | return NULL; |
| 1108 | } |
| 1109 | PyTuple_SET_ITEM(iters, i-1, it); |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1110 | } |
| 1111 | |
| 1112 | /* create imapobject structure */ |
| 1113 | lz = (imapobject *)type->tp_alloc(type, 0); |
| 1114 | if (lz == NULL) { |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1115 | Py_DECREF(iters); |
| 1116 | return NULL; |
| 1117 | } |
| 1118 | lz->iters = iters; |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1119 | func = PyTuple_GET_ITEM(args, 0); |
| 1120 | Py_INCREF(func); |
| 1121 | lz->func = func; |
| 1122 | |
| 1123 | return (PyObject *)lz; |
| 1124 | } |
| 1125 | |
| 1126 | static void |
| 1127 | imap_dealloc(imapobject *lz) |
| 1128 | { |
| 1129 | PyObject_GC_UnTrack(lz); |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1130 | Py_XDECREF(lz->iters); |
| 1131 | Py_XDECREF(lz->func); |
| 1132 | lz->ob_type->tp_free(lz); |
| 1133 | } |
| 1134 | |
| 1135 | static int |
| 1136 | imap_traverse(imapobject *lz, visitproc visit, void *arg) |
| 1137 | { |
| 1138 | int err; |
| 1139 | |
| 1140 | if (lz->iters) { |
| 1141 | err = visit(lz->iters, arg); |
| 1142 | if (err) |
| 1143 | return err; |
| 1144 | } |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1145 | if (lz->func) { |
| 1146 | err = visit(lz->func, arg); |
| 1147 | if (err) |
| 1148 | return err; |
| 1149 | } |
| 1150 | return 0; |
| 1151 | } |
| 1152 | |
Raymond Hettinger | 2012f17 | 2003-02-07 05:32:58 +0000 | [diff] [blame] | 1153 | /* |
| 1154 | imap() is an iterator version of __builtins__.map() except that it does |
| 1155 | not have the None fill-in feature. That was intentionally left out for |
| 1156 | the following reasons: |
| 1157 | |
| 1158 | 1) Itertools are designed to be easily combined and chained together. |
| 1159 | Having all tools stop with the shortest input is a unifying principle |
| 1160 | that makes it easier to combine finite iterators (supplying data) with |
| 1161 | infinite iterators like count() and repeat() (for supplying sequential |
| 1162 | or constant arguments to a function). |
| 1163 | |
| 1164 | 2) In typical use cases for combining itertools, having one finite data |
| 1165 | supplier run out before another is likely to be an error condition which |
| 1166 | should not pass silently by automatically supplying None. |
| 1167 | |
| 1168 | 3) The use cases for automatic None fill-in are rare -- not many functions |
| 1169 | do something useful when a parameter suddenly switches type and becomes |
| 1170 | None. |
| 1171 | |
| 1172 | 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] | 1173 | writing: chain(iterable, repeat(None)). |
Raymond Hettinger | 2012f17 | 2003-02-07 05:32:58 +0000 | [diff] [blame] | 1174 | |
| 1175 | 5) Similar toolsets in Haskell and SML do not have automatic None fill-in. |
| 1176 | */ |
| 1177 | |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1178 | static PyObject * |
| 1179 | imap_next(imapobject *lz) |
| 1180 | { |
| 1181 | PyObject *val; |
Raymond Hettinger | f0c0024 | 2003-02-07 07:26:25 +0000 | [diff] [blame] | 1182 | PyObject *argtuple; |
| 1183 | PyObject *result; |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1184 | int numargs, i; |
| 1185 | |
| 1186 | numargs = PyTuple_Size(lz->iters); |
Raymond Hettinger | f0c0024 | 2003-02-07 07:26:25 +0000 | [diff] [blame] | 1187 | argtuple = PyTuple_New(numargs); |
| 1188 | if (argtuple == NULL) |
| 1189 | return NULL; |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1190 | |
Raymond Hettinger | f0c0024 | 2003-02-07 07:26:25 +0000 | [diff] [blame] | 1191 | for (i=0 ; i<numargs ; i++) { |
| 1192 | val = PyIter_Next(PyTuple_GET_ITEM(lz->iters, i)); |
| 1193 | if (val == NULL) { |
| 1194 | Py_DECREF(argtuple); |
| 1195 | return NULL; |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1196 | } |
Raymond Hettinger | f0c0024 | 2003-02-07 07:26:25 +0000 | [diff] [blame] | 1197 | PyTuple_SET_ITEM(argtuple, i, val); |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1198 | } |
Raymond Hettinger | f0c0024 | 2003-02-07 07:26:25 +0000 | [diff] [blame] | 1199 | if (lz->func == Py_None) |
| 1200 | return argtuple; |
| 1201 | result = PyObject_Call(lz->func, argtuple, NULL); |
| 1202 | Py_DECREF(argtuple); |
| 1203 | return result; |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1204 | } |
| 1205 | |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1206 | PyDoc_STRVAR(imap_doc, |
| 1207 | "imap(func, *iterables) --> imap object\n\ |
| 1208 | \n\ |
| 1209 | Make an iterator that computes the function using arguments from\n\ |
| 1210 | each of the iterables. Like map() except that it returns\n\ |
| 1211 | an iterator instead of a list and that it stops when the shortest\n\ |
| 1212 | iterable is exhausted instead of filling in None for shorter\n\ |
| 1213 | iterables."); |
| 1214 | |
Raymond Hettinger | 1d7a348 | 2003-07-14 07:07:12 +0000 | [diff] [blame] | 1215 | static PyTypeObject imap_type = { |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1216 | PyObject_HEAD_INIT(NULL) |
| 1217 | 0, /* ob_size */ |
Raymond Hettinger | 60eca93 | 2003-02-09 06:40:58 +0000 | [diff] [blame] | 1218 | "itertools.imap", /* tp_name */ |
| 1219 | sizeof(imapobject), /* tp_basicsize */ |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1220 | 0, /* tp_itemsize */ |
| 1221 | /* methods */ |
| 1222 | (destructor)imap_dealloc, /* tp_dealloc */ |
| 1223 | 0, /* tp_print */ |
| 1224 | 0, /* tp_getattr */ |
| 1225 | 0, /* tp_setattr */ |
| 1226 | 0, /* tp_compare */ |
| 1227 | 0, /* tp_repr */ |
| 1228 | 0, /* tp_as_number */ |
| 1229 | 0, /* tp_as_sequence */ |
| 1230 | 0, /* tp_as_mapping */ |
| 1231 | 0, /* tp_hash */ |
| 1232 | 0, /* tp_call */ |
| 1233 | 0, /* tp_str */ |
| 1234 | PyObject_GenericGetAttr, /* tp_getattro */ |
| 1235 | 0, /* tp_setattro */ |
| 1236 | 0, /* tp_as_buffer */ |
| 1237 | Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC | |
| 1238 | Py_TPFLAGS_BASETYPE, /* tp_flags */ |
| 1239 | imap_doc, /* tp_doc */ |
| 1240 | (traverseproc)imap_traverse, /* tp_traverse */ |
| 1241 | 0, /* tp_clear */ |
| 1242 | 0, /* tp_richcompare */ |
| 1243 | 0, /* tp_weaklistoffset */ |
Raymond Hettinger | 1da1dbf | 2003-03-17 19:46:11 +0000 | [diff] [blame] | 1244 | PyObject_SelfIter, /* tp_iter */ |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1245 | (iternextfunc)imap_next, /* tp_iternext */ |
| 1246 | 0, /* tp_methods */ |
| 1247 | 0, /* tp_members */ |
| 1248 | 0, /* tp_getset */ |
| 1249 | 0, /* tp_base */ |
| 1250 | 0, /* tp_dict */ |
| 1251 | 0, /* tp_descr_get */ |
| 1252 | 0, /* tp_descr_set */ |
| 1253 | 0, /* tp_dictoffset */ |
| 1254 | 0, /* tp_init */ |
Raymond Hettinger | bfef18c | 2003-05-23 03:55:42 +0000 | [diff] [blame] | 1255 | 0, /* tp_alloc */ |
Raymond Hettinger | 60eca93 | 2003-02-09 06:40:58 +0000 | [diff] [blame] | 1256 | imap_new, /* tp_new */ |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1257 | PyObject_GC_Del, /* tp_free */ |
| 1258 | }; |
| 1259 | |
| 1260 | |
Raymond Hettinger | 61fe64d | 2003-02-23 04:40:07 +0000 | [diff] [blame] | 1261 | /* chain object ************************************************************/ |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1262 | |
| 1263 | typedef struct { |
| 1264 | PyObject_HEAD |
Raymond Hettinger | 61fe64d | 2003-02-23 04:40:07 +0000 | [diff] [blame] | 1265 | long tuplesize; |
| 1266 | long iternum; /* which iterator is active */ |
| 1267 | PyObject *ittuple; /* tuple of iterators */ |
| 1268 | } chainobject; |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1269 | |
Raymond Hettinger | 1d7a348 | 2003-07-14 07:07:12 +0000 | [diff] [blame] | 1270 | static PyTypeObject chain_type; |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1271 | |
| 1272 | static PyObject * |
Raymond Hettinger | 61fe64d | 2003-02-23 04:40:07 +0000 | [diff] [blame] | 1273 | chain_new(PyTypeObject *type, PyObject *args, PyObject *kwds) |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1274 | { |
Raymond Hettinger | 61fe64d | 2003-02-23 04:40:07 +0000 | [diff] [blame] | 1275 | chainobject *lz; |
| 1276 | int tuplesize = PySequence_Length(args); |
| 1277 | int i; |
| 1278 | PyObject *ittuple; |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1279 | |
Raymond Hettinger | 61fe64d | 2003-02-23 04:40:07 +0000 | [diff] [blame] | 1280 | /* obtain iterators */ |
| 1281 | assert(PyTuple_Check(args)); |
| 1282 | ittuple = PyTuple_New(tuplesize); |
| 1283 | if(ittuple == NULL) |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1284 | return NULL; |
Raymond Hettinger | 61fe64d | 2003-02-23 04:40:07 +0000 | [diff] [blame] | 1285 | for (i=0; i < tuplesize; ++i) { |
| 1286 | PyObject *item = PyTuple_GET_ITEM(args, i); |
| 1287 | PyObject *it = PyObject_GetIter(item); |
| 1288 | if (it == NULL) { |
| 1289 | if (PyErr_ExceptionMatches(PyExc_TypeError)) |
| 1290 | PyErr_Format(PyExc_TypeError, |
| 1291 | "chain argument #%d must support iteration", |
| 1292 | i+1); |
| 1293 | Py_DECREF(ittuple); |
| 1294 | return NULL; |
| 1295 | } |
| 1296 | PyTuple_SET_ITEM(ittuple, i, it); |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1297 | } |
| 1298 | |
Raymond Hettinger | 61fe64d | 2003-02-23 04:40:07 +0000 | [diff] [blame] | 1299 | /* create chainobject structure */ |
| 1300 | lz = (chainobject *)type->tp_alloc(type, 0); |
Raymond Hettinger | 7d98fb9 | 2003-06-17 23:14:40 +0000 | [diff] [blame] | 1301 | if (lz == NULL) { |
| 1302 | Py_DECREF(ittuple); |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1303 | return NULL; |
Raymond Hettinger | 7d98fb9 | 2003-06-17 23:14:40 +0000 | [diff] [blame] | 1304 | } |
Raymond Hettinger | 61fe64d | 2003-02-23 04:40:07 +0000 | [diff] [blame] | 1305 | |
| 1306 | lz->ittuple = ittuple; |
| 1307 | lz->iternum = 0; |
| 1308 | lz->tuplesize = tuplesize; |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1309 | |
| 1310 | return (PyObject *)lz; |
| 1311 | } |
| 1312 | |
| 1313 | static void |
Raymond Hettinger | 61fe64d | 2003-02-23 04:40:07 +0000 | [diff] [blame] | 1314 | chain_dealloc(chainobject *lz) |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1315 | { |
| 1316 | PyObject_GC_UnTrack(lz); |
Raymond Hettinger | 61fe64d | 2003-02-23 04:40:07 +0000 | [diff] [blame] | 1317 | Py_XDECREF(lz->ittuple); |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1318 | lz->ob_type->tp_free(lz); |
| 1319 | } |
| 1320 | |
Raymond Hettinger | 2012f17 | 2003-02-07 05:32:58 +0000 | [diff] [blame] | 1321 | static int |
Raymond Hettinger | 61fe64d | 2003-02-23 04:40:07 +0000 | [diff] [blame] | 1322 | chain_traverse(chainobject *lz, visitproc visit, void *arg) |
Raymond Hettinger | 2012f17 | 2003-02-07 05:32:58 +0000 | [diff] [blame] | 1323 | { |
Raymond Hettinger | 61fe64d | 2003-02-23 04:40:07 +0000 | [diff] [blame] | 1324 | if (lz->ittuple) |
| 1325 | return visit(lz->ittuple, arg); |
Raymond Hettinger | 2012f17 | 2003-02-07 05:32:58 +0000 | [diff] [blame] | 1326 | return 0; |
| 1327 | } |
| 1328 | |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1329 | static PyObject * |
Raymond Hettinger | 61fe64d | 2003-02-23 04:40:07 +0000 | [diff] [blame] | 1330 | chain_next(chainobject *lz) |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1331 | { |
Raymond Hettinger | 61fe64d | 2003-02-23 04:40:07 +0000 | [diff] [blame] | 1332 | PyObject *it; |
| 1333 | PyObject *item; |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1334 | |
Raymond Hettinger | 61fe64d | 2003-02-23 04:40:07 +0000 | [diff] [blame] | 1335 | while (lz->iternum < lz->tuplesize) { |
| 1336 | it = PyTuple_GET_ITEM(lz->ittuple, lz->iternum); |
| 1337 | item = PyIter_Next(it); |
| 1338 | if (item != NULL) |
| 1339 | return item; |
| 1340 | lz->iternum++; |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1341 | } |
| 1342 | return NULL; |
| 1343 | } |
| 1344 | |
Raymond Hettinger | 61fe64d | 2003-02-23 04:40:07 +0000 | [diff] [blame] | 1345 | PyDoc_STRVAR(chain_doc, |
| 1346 | "chain(*iterables) --> chain object\n\ |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1347 | \n\ |
Raymond Hettinger | 61fe64d | 2003-02-23 04:40:07 +0000 | [diff] [blame] | 1348 | Return a chain object whose .next() method returns elements from the\n\ |
| 1349 | first iterable until it is exhausted, then elements from the next\n\ |
| 1350 | iterable, until all of the iterables are exhausted."); |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1351 | |
Raymond Hettinger | 1d7a348 | 2003-07-14 07:07:12 +0000 | [diff] [blame] | 1352 | static PyTypeObject chain_type = { |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1353 | PyObject_HEAD_INIT(NULL) |
| 1354 | 0, /* ob_size */ |
Raymond Hettinger | 61fe64d | 2003-02-23 04:40:07 +0000 | [diff] [blame] | 1355 | "itertools.chain", /* tp_name */ |
| 1356 | sizeof(chainobject), /* tp_basicsize */ |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1357 | 0, /* tp_itemsize */ |
| 1358 | /* methods */ |
Raymond Hettinger | 61fe64d | 2003-02-23 04:40:07 +0000 | [diff] [blame] | 1359 | (destructor)chain_dealloc, /* tp_dealloc */ |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1360 | 0, /* tp_print */ |
| 1361 | 0, /* tp_getattr */ |
| 1362 | 0, /* tp_setattr */ |
| 1363 | 0, /* tp_compare */ |
| 1364 | 0, /* tp_repr */ |
| 1365 | 0, /* tp_as_number */ |
| 1366 | 0, /* tp_as_sequence */ |
| 1367 | 0, /* tp_as_mapping */ |
| 1368 | 0, /* tp_hash */ |
| 1369 | 0, /* tp_call */ |
| 1370 | 0, /* tp_str */ |
| 1371 | PyObject_GenericGetAttr, /* tp_getattro */ |
| 1372 | 0, /* tp_setattro */ |
| 1373 | 0, /* tp_as_buffer */ |
| 1374 | Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC | |
| 1375 | Py_TPFLAGS_BASETYPE, /* tp_flags */ |
Raymond Hettinger | 61fe64d | 2003-02-23 04:40:07 +0000 | [diff] [blame] | 1376 | chain_doc, /* tp_doc */ |
| 1377 | (traverseproc)chain_traverse, /* tp_traverse */ |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1378 | 0, /* tp_clear */ |
| 1379 | 0, /* tp_richcompare */ |
| 1380 | 0, /* tp_weaklistoffset */ |
Raymond Hettinger | 1da1dbf | 2003-03-17 19:46:11 +0000 | [diff] [blame] | 1381 | PyObject_SelfIter, /* tp_iter */ |
Raymond Hettinger | 61fe64d | 2003-02-23 04:40:07 +0000 | [diff] [blame] | 1382 | (iternextfunc)chain_next, /* tp_iternext */ |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1383 | 0, /* tp_methods */ |
| 1384 | 0, /* tp_members */ |
| 1385 | 0, /* tp_getset */ |
| 1386 | 0, /* tp_base */ |
| 1387 | 0, /* tp_dict */ |
| 1388 | 0, /* tp_descr_get */ |
| 1389 | 0, /* tp_descr_set */ |
| 1390 | 0, /* tp_dictoffset */ |
| 1391 | 0, /* tp_init */ |
Raymond Hettinger | bfef18c | 2003-05-23 03:55:42 +0000 | [diff] [blame] | 1392 | 0, /* tp_alloc */ |
Raymond Hettinger | 61fe64d | 2003-02-23 04:40:07 +0000 | [diff] [blame] | 1393 | chain_new, /* tp_new */ |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1394 | PyObject_GC_Del, /* tp_free */ |
| 1395 | }; |
| 1396 | |
| 1397 | |
| 1398 | /* ifilter object ************************************************************/ |
| 1399 | |
| 1400 | typedef struct { |
| 1401 | PyObject_HEAD |
| 1402 | PyObject *func; |
| 1403 | PyObject *it; |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1404 | } ifilterobject; |
| 1405 | |
Raymond Hettinger | 1d7a348 | 2003-07-14 07:07:12 +0000 | [diff] [blame] | 1406 | static PyTypeObject ifilter_type; |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1407 | |
| 1408 | static PyObject * |
| 1409 | ifilter_new(PyTypeObject *type, PyObject *args, PyObject *kwds) |
| 1410 | { |
Raymond Hettinger | 60eca93 | 2003-02-09 06:40:58 +0000 | [diff] [blame] | 1411 | PyObject *func, *seq; |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1412 | PyObject *it; |
| 1413 | ifilterobject *lz; |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1414 | |
Raymond Hettinger | 60eca93 | 2003-02-09 06:40:58 +0000 | [diff] [blame] | 1415 | if (!PyArg_UnpackTuple(args, "ifilter", 2, 2, &func, &seq)) |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1416 | return NULL; |
| 1417 | |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1418 | /* Get iterator. */ |
| 1419 | it = PyObject_GetIter(seq); |
| 1420 | if (it == NULL) |
| 1421 | return NULL; |
| 1422 | |
| 1423 | /* create ifilterobject structure */ |
| 1424 | lz = (ifilterobject *)type->tp_alloc(type, 0); |
| 1425 | if (lz == NULL) { |
| 1426 | Py_DECREF(it); |
| 1427 | return NULL; |
| 1428 | } |
| 1429 | Py_INCREF(func); |
| 1430 | lz->func = func; |
| 1431 | lz->it = it; |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1432 | |
| 1433 | return (PyObject *)lz; |
| 1434 | } |
| 1435 | |
| 1436 | static void |
| 1437 | ifilter_dealloc(ifilterobject *lz) |
| 1438 | { |
| 1439 | PyObject_GC_UnTrack(lz); |
| 1440 | Py_XDECREF(lz->func); |
| 1441 | Py_XDECREF(lz->it); |
| 1442 | lz->ob_type->tp_free(lz); |
| 1443 | } |
| 1444 | |
| 1445 | static int |
| 1446 | ifilter_traverse(ifilterobject *lz, visitproc visit, void *arg) |
| 1447 | { |
| 1448 | int err; |
| 1449 | |
| 1450 | if (lz->it) { |
| 1451 | err = visit(lz->it, arg); |
| 1452 | if (err) |
| 1453 | return err; |
| 1454 | } |
| 1455 | if (lz->func) { |
| 1456 | err = visit(lz->func, arg); |
| 1457 | if (err) |
| 1458 | return err; |
| 1459 | } |
| 1460 | return 0; |
| 1461 | } |
| 1462 | |
| 1463 | static PyObject * |
| 1464 | ifilter_next(ifilterobject *lz) |
| 1465 | { |
| 1466 | PyObject *item; |
Raymond Hettinger | d1a283b | 2003-03-01 01:48:24 +0000 | [diff] [blame] | 1467 | PyObject *it = lz->it; |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1468 | long ok; |
| 1469 | |
| 1470 | for (;;) { |
Raymond Hettinger | d1a283b | 2003-03-01 01:48:24 +0000 | [diff] [blame] | 1471 | assert(PyIter_Check(it)); |
| 1472 | item = (*it->ob_type->tp_iternext)(it); |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1473 | if (item == NULL) |
| 1474 | return NULL; |
| 1475 | |
| 1476 | if (lz->func == Py_None) { |
| 1477 | ok = PyObject_IsTrue(item); |
| 1478 | } else { |
| 1479 | PyObject *good; |
| 1480 | good = PyObject_CallFunctionObjArgs(lz->func, |
| 1481 | item, NULL); |
| 1482 | if (good == NULL) { |
| 1483 | Py_DECREF(item); |
| 1484 | return NULL; |
| 1485 | } |
| 1486 | ok = PyObject_IsTrue(good); |
| 1487 | Py_DECREF(good); |
| 1488 | } |
Raymond Hettinger | 60eca93 | 2003-02-09 06:40:58 +0000 | [diff] [blame] | 1489 | if (ok) |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1490 | return item; |
| 1491 | Py_DECREF(item); |
| 1492 | } |
| 1493 | } |
| 1494 | |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1495 | PyDoc_STRVAR(ifilter_doc, |
Raymond Hettinger | 60eca93 | 2003-02-09 06:40:58 +0000 | [diff] [blame] | 1496 | "ifilter(function or None, sequence) --> ifilter object\n\ |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1497 | \n\ |
Raymond Hettinger | 60eca93 | 2003-02-09 06:40:58 +0000 | [diff] [blame] | 1498 | Return those items of sequence for which function(item) is true.\n\ |
| 1499 | If function is None, return the items that are true."); |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1500 | |
Raymond Hettinger | 1d7a348 | 2003-07-14 07:07:12 +0000 | [diff] [blame] | 1501 | static PyTypeObject ifilter_type = { |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1502 | PyObject_HEAD_INIT(NULL) |
| 1503 | 0, /* ob_size */ |
Raymond Hettinger | 60eca93 | 2003-02-09 06:40:58 +0000 | [diff] [blame] | 1504 | "itertools.ifilter", /* tp_name */ |
| 1505 | sizeof(ifilterobject), /* tp_basicsize */ |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1506 | 0, /* tp_itemsize */ |
| 1507 | /* methods */ |
Raymond Hettinger | 60eca93 | 2003-02-09 06:40:58 +0000 | [diff] [blame] | 1508 | (destructor)ifilter_dealloc, /* tp_dealloc */ |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1509 | 0, /* tp_print */ |
| 1510 | 0, /* tp_getattr */ |
| 1511 | 0, /* tp_setattr */ |
| 1512 | 0, /* tp_compare */ |
| 1513 | 0, /* tp_repr */ |
| 1514 | 0, /* tp_as_number */ |
| 1515 | 0, /* tp_as_sequence */ |
| 1516 | 0, /* tp_as_mapping */ |
| 1517 | 0, /* tp_hash */ |
| 1518 | 0, /* tp_call */ |
| 1519 | 0, /* tp_str */ |
| 1520 | PyObject_GenericGetAttr, /* tp_getattro */ |
| 1521 | 0, /* tp_setattro */ |
| 1522 | 0, /* tp_as_buffer */ |
| 1523 | Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC | |
| 1524 | Py_TPFLAGS_BASETYPE, /* tp_flags */ |
Raymond Hettinger | 60eca93 | 2003-02-09 06:40:58 +0000 | [diff] [blame] | 1525 | ifilter_doc, /* tp_doc */ |
| 1526 | (traverseproc)ifilter_traverse, /* tp_traverse */ |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1527 | 0, /* tp_clear */ |
| 1528 | 0, /* tp_richcompare */ |
| 1529 | 0, /* tp_weaklistoffset */ |
Raymond Hettinger | 1da1dbf | 2003-03-17 19:46:11 +0000 | [diff] [blame] | 1530 | PyObject_SelfIter, /* tp_iter */ |
Raymond Hettinger | 60eca93 | 2003-02-09 06:40:58 +0000 | [diff] [blame] | 1531 | (iternextfunc)ifilter_next, /* tp_iternext */ |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1532 | 0, /* tp_methods */ |
| 1533 | 0, /* tp_members */ |
| 1534 | 0, /* tp_getset */ |
| 1535 | 0, /* tp_base */ |
| 1536 | 0, /* tp_dict */ |
| 1537 | 0, /* tp_descr_get */ |
| 1538 | 0, /* tp_descr_set */ |
| 1539 | 0, /* tp_dictoffset */ |
| 1540 | 0, /* tp_init */ |
Raymond Hettinger | bfef18c | 2003-05-23 03:55:42 +0000 | [diff] [blame] | 1541 | 0, /* tp_alloc */ |
Raymond Hettinger | 60eca93 | 2003-02-09 06:40:58 +0000 | [diff] [blame] | 1542 | ifilter_new, /* tp_new */ |
| 1543 | PyObject_GC_Del, /* tp_free */ |
| 1544 | }; |
| 1545 | |
| 1546 | |
| 1547 | /* ifilterfalse object ************************************************************/ |
| 1548 | |
| 1549 | typedef struct { |
| 1550 | PyObject_HEAD |
| 1551 | PyObject *func; |
| 1552 | PyObject *it; |
| 1553 | } ifilterfalseobject; |
| 1554 | |
Raymond Hettinger | 1d7a348 | 2003-07-14 07:07:12 +0000 | [diff] [blame] | 1555 | static PyTypeObject ifilterfalse_type; |
Raymond Hettinger | 60eca93 | 2003-02-09 06:40:58 +0000 | [diff] [blame] | 1556 | |
| 1557 | static PyObject * |
| 1558 | ifilterfalse_new(PyTypeObject *type, PyObject *args, PyObject *kwds) |
| 1559 | { |
Guido van Rossum | d58f3fc | 2003-02-09 17:19:18 +0000 | [diff] [blame] | 1560 | PyObject *func, *seq; |
Raymond Hettinger | 60eca93 | 2003-02-09 06:40:58 +0000 | [diff] [blame] | 1561 | PyObject *it; |
| 1562 | ifilterfalseobject *lz; |
| 1563 | |
| 1564 | if (!PyArg_UnpackTuple(args, "ifilterfalse", 2, 2, &func, &seq)) |
| 1565 | return NULL; |
| 1566 | |
| 1567 | /* Get iterator. */ |
| 1568 | it = PyObject_GetIter(seq); |
| 1569 | if (it == NULL) |
| 1570 | return NULL; |
| 1571 | |
| 1572 | /* create ifilterfalseobject structure */ |
| 1573 | lz = (ifilterfalseobject *)type->tp_alloc(type, 0); |
| 1574 | if (lz == NULL) { |
| 1575 | Py_DECREF(it); |
| 1576 | return NULL; |
| 1577 | } |
| 1578 | Py_INCREF(func); |
| 1579 | lz->func = func; |
| 1580 | lz->it = it; |
| 1581 | |
| 1582 | return (PyObject *)lz; |
| 1583 | } |
| 1584 | |
| 1585 | static void |
| 1586 | ifilterfalse_dealloc(ifilterfalseobject *lz) |
| 1587 | { |
| 1588 | PyObject_GC_UnTrack(lz); |
| 1589 | Py_XDECREF(lz->func); |
| 1590 | Py_XDECREF(lz->it); |
| 1591 | lz->ob_type->tp_free(lz); |
| 1592 | } |
| 1593 | |
| 1594 | static int |
| 1595 | ifilterfalse_traverse(ifilterfalseobject *lz, visitproc visit, void *arg) |
| 1596 | { |
| 1597 | int err; |
| 1598 | |
| 1599 | if (lz->it) { |
| 1600 | err = visit(lz->it, arg); |
| 1601 | if (err) |
| 1602 | return err; |
| 1603 | } |
| 1604 | if (lz->func) { |
| 1605 | err = visit(lz->func, arg); |
| 1606 | if (err) |
| 1607 | return err; |
| 1608 | } |
| 1609 | return 0; |
| 1610 | } |
| 1611 | |
| 1612 | static PyObject * |
| 1613 | ifilterfalse_next(ifilterfalseobject *lz) |
| 1614 | { |
| 1615 | PyObject *item; |
Raymond Hettinger | d1a283b | 2003-03-01 01:48:24 +0000 | [diff] [blame] | 1616 | PyObject *it = lz->it; |
Raymond Hettinger | 60eca93 | 2003-02-09 06:40:58 +0000 | [diff] [blame] | 1617 | long ok; |
| 1618 | |
| 1619 | for (;;) { |
Raymond Hettinger | d1a283b | 2003-03-01 01:48:24 +0000 | [diff] [blame] | 1620 | assert(PyIter_Check(it)); |
| 1621 | item = (*it->ob_type->tp_iternext)(it); |
Raymond Hettinger | 60eca93 | 2003-02-09 06:40:58 +0000 | [diff] [blame] | 1622 | if (item == NULL) |
| 1623 | return NULL; |
| 1624 | |
| 1625 | if (lz->func == Py_None) { |
| 1626 | ok = PyObject_IsTrue(item); |
| 1627 | } else { |
| 1628 | PyObject *good; |
| 1629 | good = PyObject_CallFunctionObjArgs(lz->func, |
| 1630 | item, NULL); |
| 1631 | if (good == NULL) { |
| 1632 | Py_DECREF(item); |
| 1633 | return NULL; |
| 1634 | } |
| 1635 | ok = PyObject_IsTrue(good); |
| 1636 | Py_DECREF(good); |
| 1637 | } |
| 1638 | if (!ok) |
| 1639 | return item; |
| 1640 | Py_DECREF(item); |
| 1641 | } |
| 1642 | } |
| 1643 | |
Raymond Hettinger | 60eca93 | 2003-02-09 06:40:58 +0000 | [diff] [blame] | 1644 | PyDoc_STRVAR(ifilterfalse_doc, |
| 1645 | "ifilterfalse(function or None, sequence) --> ifilterfalse object\n\ |
| 1646 | \n\ |
| 1647 | Return those items of sequence for which function(item) is false.\n\ |
| 1648 | If function is None, return the items that are false."); |
| 1649 | |
Raymond Hettinger | 1d7a348 | 2003-07-14 07:07:12 +0000 | [diff] [blame] | 1650 | static PyTypeObject ifilterfalse_type = { |
Raymond Hettinger | 60eca93 | 2003-02-09 06:40:58 +0000 | [diff] [blame] | 1651 | PyObject_HEAD_INIT(NULL) |
| 1652 | 0, /* ob_size */ |
| 1653 | "itertools.ifilterfalse", /* tp_name */ |
| 1654 | sizeof(ifilterfalseobject), /* tp_basicsize */ |
| 1655 | 0, /* tp_itemsize */ |
| 1656 | /* methods */ |
| 1657 | (destructor)ifilterfalse_dealloc, /* tp_dealloc */ |
| 1658 | 0, /* tp_print */ |
| 1659 | 0, /* tp_getattr */ |
| 1660 | 0, /* tp_setattr */ |
| 1661 | 0, /* tp_compare */ |
| 1662 | 0, /* tp_repr */ |
| 1663 | 0, /* tp_as_number */ |
| 1664 | 0, /* tp_as_sequence */ |
| 1665 | 0, /* tp_as_mapping */ |
| 1666 | 0, /* tp_hash */ |
| 1667 | 0, /* tp_call */ |
| 1668 | 0, /* tp_str */ |
| 1669 | PyObject_GenericGetAttr, /* tp_getattro */ |
| 1670 | 0, /* tp_setattro */ |
| 1671 | 0, /* tp_as_buffer */ |
| 1672 | Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC | |
| 1673 | Py_TPFLAGS_BASETYPE, /* tp_flags */ |
| 1674 | ifilterfalse_doc, /* tp_doc */ |
| 1675 | (traverseproc)ifilterfalse_traverse, /* tp_traverse */ |
| 1676 | 0, /* tp_clear */ |
| 1677 | 0, /* tp_richcompare */ |
| 1678 | 0, /* tp_weaklistoffset */ |
Raymond Hettinger | 1da1dbf | 2003-03-17 19:46:11 +0000 | [diff] [blame] | 1679 | PyObject_SelfIter, /* tp_iter */ |
Raymond Hettinger | 60eca93 | 2003-02-09 06:40:58 +0000 | [diff] [blame] | 1680 | (iternextfunc)ifilterfalse_next, /* tp_iternext */ |
| 1681 | 0, /* tp_methods */ |
| 1682 | 0, /* tp_members */ |
| 1683 | 0, /* tp_getset */ |
| 1684 | 0, /* tp_base */ |
| 1685 | 0, /* tp_dict */ |
| 1686 | 0, /* tp_descr_get */ |
| 1687 | 0, /* tp_descr_set */ |
| 1688 | 0, /* tp_dictoffset */ |
| 1689 | 0, /* tp_init */ |
Raymond Hettinger | bfef18c | 2003-05-23 03:55:42 +0000 | [diff] [blame] | 1690 | 0, /* tp_alloc */ |
Raymond Hettinger | 60eca93 | 2003-02-09 06:40:58 +0000 | [diff] [blame] | 1691 | ifilterfalse_new, /* tp_new */ |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1692 | PyObject_GC_Del, /* tp_free */ |
| 1693 | }; |
| 1694 | |
| 1695 | |
| 1696 | /* count object ************************************************************/ |
| 1697 | |
| 1698 | typedef struct { |
| 1699 | PyObject_HEAD |
| 1700 | long cnt; |
| 1701 | } countobject; |
| 1702 | |
Raymond Hettinger | 1d7a348 | 2003-07-14 07:07:12 +0000 | [diff] [blame] | 1703 | static PyTypeObject count_type; |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1704 | |
| 1705 | static PyObject * |
| 1706 | count_new(PyTypeObject *type, PyObject *args, PyObject *kwds) |
| 1707 | { |
| 1708 | countobject *lz; |
| 1709 | long cnt = 0; |
| 1710 | |
| 1711 | if (!PyArg_ParseTuple(args, "|l:count", &cnt)) |
| 1712 | return NULL; |
| 1713 | |
| 1714 | /* create countobject structure */ |
| 1715 | lz = (countobject *)PyObject_New(countobject, &count_type); |
| 1716 | if (lz == NULL) |
| 1717 | return NULL; |
| 1718 | lz->cnt = cnt; |
| 1719 | |
| 1720 | return (PyObject *)lz; |
| 1721 | } |
| 1722 | |
| 1723 | static PyObject * |
| 1724 | count_next(countobject *lz) |
| 1725 | { |
| 1726 | return PyInt_FromLong(lz->cnt++); |
| 1727 | } |
| 1728 | |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1729 | PyDoc_STRVAR(count_doc, |
| 1730 | "count([firstval]) --> count object\n\ |
| 1731 | \n\ |
| 1732 | Return a count object whose .next() method returns consecutive\n\ |
| 1733 | integers starting from zero or, if specified, from firstval."); |
| 1734 | |
Raymond Hettinger | 1d7a348 | 2003-07-14 07:07:12 +0000 | [diff] [blame] | 1735 | static PyTypeObject count_type = { |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1736 | PyObject_HEAD_INIT(NULL) |
| 1737 | 0, /* ob_size */ |
Raymond Hettinger | 60eca93 | 2003-02-09 06:40:58 +0000 | [diff] [blame] | 1738 | "itertools.count", /* tp_name */ |
| 1739 | sizeof(countobject), /* tp_basicsize */ |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1740 | 0, /* tp_itemsize */ |
| 1741 | /* methods */ |
| 1742 | (destructor)PyObject_Del, /* tp_dealloc */ |
| 1743 | 0, /* tp_print */ |
| 1744 | 0, /* tp_getattr */ |
| 1745 | 0, /* tp_setattr */ |
| 1746 | 0, /* tp_compare */ |
| 1747 | 0, /* tp_repr */ |
| 1748 | 0, /* tp_as_number */ |
| 1749 | 0, /* tp_as_sequence */ |
| 1750 | 0, /* tp_as_mapping */ |
| 1751 | 0, /* tp_hash */ |
| 1752 | 0, /* tp_call */ |
| 1753 | 0, /* tp_str */ |
| 1754 | PyObject_GenericGetAttr, /* tp_getattro */ |
| 1755 | 0, /* tp_setattro */ |
| 1756 | 0, /* tp_as_buffer */ |
| 1757 | Py_TPFLAGS_DEFAULT, /* tp_flags */ |
Raymond Hettinger | 60eca93 | 2003-02-09 06:40:58 +0000 | [diff] [blame] | 1758 | count_doc, /* tp_doc */ |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1759 | 0, /* tp_traverse */ |
| 1760 | 0, /* tp_clear */ |
| 1761 | 0, /* tp_richcompare */ |
| 1762 | 0, /* tp_weaklistoffset */ |
Raymond Hettinger | 1da1dbf | 2003-03-17 19:46:11 +0000 | [diff] [blame] | 1763 | PyObject_SelfIter, /* tp_iter */ |
Raymond Hettinger | 60eca93 | 2003-02-09 06:40:58 +0000 | [diff] [blame] | 1764 | (iternextfunc)count_next, /* tp_iternext */ |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1765 | 0, /* tp_methods */ |
| 1766 | 0, /* tp_members */ |
| 1767 | 0, /* tp_getset */ |
| 1768 | 0, /* tp_base */ |
| 1769 | 0, /* tp_dict */ |
| 1770 | 0, /* tp_descr_get */ |
| 1771 | 0, /* tp_descr_set */ |
| 1772 | 0, /* tp_dictoffset */ |
| 1773 | 0, /* tp_init */ |
Raymond Hettinger | bfef18c | 2003-05-23 03:55:42 +0000 | [diff] [blame] | 1774 | 0, /* tp_alloc */ |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1775 | count_new, /* tp_new */ |
| 1776 | }; |
| 1777 | |
| 1778 | |
| 1779 | /* izip object ************************************************************/ |
| 1780 | |
| 1781 | #include "Python.h" |
| 1782 | |
| 1783 | typedef struct { |
| 1784 | PyObject_HEAD |
| 1785 | long tuplesize; |
| 1786 | PyObject *ittuple; /* tuple of iterators */ |
Raymond Hettinger | 2012f17 | 2003-02-07 05:32:58 +0000 | [diff] [blame] | 1787 | PyObject *result; |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1788 | } izipobject; |
| 1789 | |
Raymond Hettinger | 1d7a348 | 2003-07-14 07:07:12 +0000 | [diff] [blame] | 1790 | static PyTypeObject izip_type; |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1791 | |
| 1792 | static PyObject * |
| 1793 | izip_new(PyTypeObject *type, PyObject *args, PyObject *kwds) |
| 1794 | { |
| 1795 | izipobject *lz; |
| 1796 | int i; |
| 1797 | PyObject *ittuple; /* tuple of iterators */ |
Raymond Hettinger | 2012f17 | 2003-02-07 05:32:58 +0000 | [diff] [blame] | 1798 | PyObject *result; |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1799 | int tuplesize = PySequence_Length(args); |
| 1800 | |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1801 | /* args must be a tuple */ |
| 1802 | assert(PyTuple_Check(args)); |
| 1803 | |
| 1804 | /* obtain iterators */ |
| 1805 | ittuple = PyTuple_New(tuplesize); |
| 1806 | if(ittuple == NULL) |
| 1807 | return NULL; |
| 1808 | for (i=0; i < tuplesize; ++i) { |
| 1809 | PyObject *item = PyTuple_GET_ITEM(args, i); |
| 1810 | PyObject *it = PyObject_GetIter(item); |
| 1811 | if (it == NULL) { |
| 1812 | if (PyErr_ExceptionMatches(PyExc_TypeError)) |
| 1813 | PyErr_Format(PyExc_TypeError, |
| 1814 | "izip argument #%d must support iteration", |
| 1815 | i+1); |
| 1816 | Py_DECREF(ittuple); |
| 1817 | return NULL; |
| 1818 | } |
| 1819 | PyTuple_SET_ITEM(ittuple, i, it); |
| 1820 | } |
| 1821 | |
Raymond Hettinger | 2012f17 | 2003-02-07 05:32:58 +0000 | [diff] [blame] | 1822 | /* create a result holder */ |
| 1823 | result = PyTuple_New(tuplesize); |
| 1824 | if (result == NULL) { |
| 1825 | Py_DECREF(ittuple); |
| 1826 | return NULL; |
| 1827 | } |
| 1828 | for (i=0 ; i < tuplesize ; i++) { |
| 1829 | Py_INCREF(Py_None); |
| 1830 | PyTuple_SET_ITEM(result, i, Py_None); |
| 1831 | } |
| 1832 | |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1833 | /* create izipobject structure */ |
| 1834 | lz = (izipobject *)type->tp_alloc(type, 0); |
| 1835 | if (lz == NULL) { |
| 1836 | Py_DECREF(ittuple); |
Raymond Hettinger | 2012f17 | 2003-02-07 05:32:58 +0000 | [diff] [blame] | 1837 | Py_DECREF(result); |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1838 | return NULL; |
| 1839 | } |
| 1840 | lz->ittuple = ittuple; |
| 1841 | lz->tuplesize = tuplesize; |
Raymond Hettinger | 2012f17 | 2003-02-07 05:32:58 +0000 | [diff] [blame] | 1842 | lz->result = result; |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1843 | |
| 1844 | return (PyObject *)lz; |
| 1845 | } |
| 1846 | |
| 1847 | static void |
| 1848 | izip_dealloc(izipobject *lz) |
| 1849 | { |
| 1850 | PyObject_GC_UnTrack(lz); |
| 1851 | Py_XDECREF(lz->ittuple); |
Raymond Hettinger | 2012f17 | 2003-02-07 05:32:58 +0000 | [diff] [blame] | 1852 | Py_XDECREF(lz->result); |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1853 | lz->ob_type->tp_free(lz); |
| 1854 | } |
| 1855 | |
| 1856 | static int |
| 1857 | izip_traverse(izipobject *lz, visitproc visit, void *arg) |
| 1858 | { |
Raymond Hettinger | befa37d | 2003-06-18 19:25:37 +0000 | [diff] [blame] | 1859 | int err; |
| 1860 | |
| 1861 | if (lz->ittuple) { |
| 1862 | err = visit(lz->ittuple, arg); |
| 1863 | if (err) |
| 1864 | return err; |
| 1865 | } |
| 1866 | if (lz->result) { |
| 1867 | err = visit(lz->result, arg); |
| 1868 | if (err) |
| 1869 | return err; |
| 1870 | } |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1871 | return 0; |
| 1872 | } |
| 1873 | |
| 1874 | static PyObject * |
| 1875 | izip_next(izipobject *lz) |
| 1876 | { |
| 1877 | int i; |
| 1878 | long tuplesize = lz->tuplesize; |
Raymond Hettinger | 2012f17 | 2003-02-07 05:32:58 +0000 | [diff] [blame] | 1879 | PyObject *result = lz->result; |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1880 | PyObject *it; |
| 1881 | PyObject *item; |
Raymond Hettinger | 4f01f89 | 2003-08-30 00:10:06 +0000 | [diff] [blame] | 1882 | PyObject *olditem; |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1883 | |
Raymond Hettinger | b5a4208 | 2003-08-08 05:10:41 +0000 | [diff] [blame] | 1884 | if (tuplesize == 0) |
| 1885 | return NULL; |
Raymond Hettinger | 2012f17 | 2003-02-07 05:32:58 +0000 | [diff] [blame] | 1886 | if (result->ob_refcnt == 1) { |
Raymond Hettinger | a56f6b6 | 2003-08-29 23:09:58 +0000 | [diff] [blame] | 1887 | Py_INCREF(result); |
Raymond Hettinger | 2012f17 | 2003-02-07 05:32:58 +0000 | [diff] [blame] | 1888 | for (i=0 ; i < tuplesize ; i++) { |
Raymond Hettinger | f0c0024 | 2003-02-07 07:26:25 +0000 | [diff] [blame] | 1889 | it = PyTuple_GET_ITEM(lz->ittuple, i); |
Raymond Hettinger | d1a283b | 2003-03-01 01:48:24 +0000 | [diff] [blame] | 1890 | assert(PyIter_Check(it)); |
| 1891 | item = (*it->ob_type->tp_iternext)(it); |
Raymond Hettinger | a56f6b6 | 2003-08-29 23:09:58 +0000 | [diff] [blame] | 1892 | if (item == NULL) { |
| 1893 | Py_DECREF(result); |
Raymond Hettinger | f0c0024 | 2003-02-07 07:26:25 +0000 | [diff] [blame] | 1894 | return NULL; |
Raymond Hettinger | a56f6b6 | 2003-08-29 23:09:58 +0000 | [diff] [blame] | 1895 | } |
Raymond Hettinger | 4f01f89 | 2003-08-30 00:10:06 +0000 | [diff] [blame] | 1896 | olditem = PyTuple_GET_ITEM(result, i); |
Raymond Hettinger | f0c0024 | 2003-02-07 07:26:25 +0000 | [diff] [blame] | 1897 | PyTuple_SET_ITEM(result, i, item); |
Raymond Hettinger | 4f01f89 | 2003-08-30 00:10:06 +0000 | [diff] [blame] | 1898 | Py_DECREF(olditem); |
Raymond Hettinger | 2012f17 | 2003-02-07 05:32:58 +0000 | [diff] [blame] | 1899 | } |
Raymond Hettinger | 2012f17 | 2003-02-07 05:32:58 +0000 | [diff] [blame] | 1900 | } else { |
Raymond Hettinger | 2012f17 | 2003-02-07 05:32:58 +0000 | [diff] [blame] | 1901 | result = PyTuple_New(tuplesize); |
| 1902 | if (result == NULL) |
| 1903 | return NULL; |
Raymond Hettinger | f0c0024 | 2003-02-07 07:26:25 +0000 | [diff] [blame] | 1904 | for (i=0 ; i < tuplesize ; i++) { |
| 1905 | it = PyTuple_GET_ITEM(lz->ittuple, i); |
Raymond Hettinger | d1a283b | 2003-03-01 01:48:24 +0000 | [diff] [blame] | 1906 | assert(PyIter_Check(it)); |
| 1907 | item = (*it->ob_type->tp_iternext)(it); |
Raymond Hettinger | f0c0024 | 2003-02-07 07:26:25 +0000 | [diff] [blame] | 1908 | if (item == NULL) { |
| 1909 | Py_DECREF(result); |
| 1910 | return NULL; |
| 1911 | } |
| 1912 | PyTuple_SET_ITEM(result, i, item); |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1913 | } |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1914 | } |
| 1915 | return result; |
| 1916 | } |
| 1917 | |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1918 | PyDoc_STRVAR(izip_doc, |
| 1919 | "izip(iter1 [,iter2 [...]]) --> izip object\n\ |
| 1920 | \n\ |
| 1921 | Return a izip object whose .next() method returns a tuple where\n\ |
| 1922 | the i-th element comes from the i-th iterable argument. The .next()\n\ |
| 1923 | method continues until the shortest iterable in the argument sequence\n\ |
| 1924 | is exhausted and then it raises StopIteration. Works like the zip()\n\ |
| 1925 | function but consumes less memory by returning an iterator instead of\n\ |
| 1926 | a list."); |
| 1927 | |
Raymond Hettinger | 1d7a348 | 2003-07-14 07:07:12 +0000 | [diff] [blame] | 1928 | static PyTypeObject izip_type = { |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1929 | PyObject_HEAD_INIT(NULL) |
| 1930 | 0, /* ob_size */ |
Raymond Hettinger | 60eca93 | 2003-02-09 06:40:58 +0000 | [diff] [blame] | 1931 | "itertools.izip", /* tp_name */ |
| 1932 | sizeof(izipobject), /* tp_basicsize */ |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1933 | 0, /* tp_itemsize */ |
| 1934 | /* methods */ |
Raymond Hettinger | 60eca93 | 2003-02-09 06:40:58 +0000 | [diff] [blame] | 1935 | (destructor)izip_dealloc, /* tp_dealloc */ |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1936 | 0, /* tp_print */ |
| 1937 | 0, /* tp_getattr */ |
| 1938 | 0, /* tp_setattr */ |
| 1939 | 0, /* tp_compare */ |
| 1940 | 0, /* tp_repr */ |
| 1941 | 0, /* tp_as_number */ |
| 1942 | 0, /* tp_as_sequence */ |
| 1943 | 0, /* tp_as_mapping */ |
| 1944 | 0, /* tp_hash */ |
| 1945 | 0, /* tp_call */ |
| 1946 | 0, /* tp_str */ |
| 1947 | PyObject_GenericGetAttr, /* tp_getattro */ |
| 1948 | 0, /* tp_setattro */ |
| 1949 | 0, /* tp_as_buffer */ |
| 1950 | Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC | |
| 1951 | Py_TPFLAGS_BASETYPE, /* tp_flags */ |
Raymond Hettinger | 60eca93 | 2003-02-09 06:40:58 +0000 | [diff] [blame] | 1952 | izip_doc, /* tp_doc */ |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1953 | (traverseproc)izip_traverse, /* tp_traverse */ |
| 1954 | 0, /* tp_clear */ |
| 1955 | 0, /* tp_richcompare */ |
| 1956 | 0, /* tp_weaklistoffset */ |
Raymond Hettinger | 1da1dbf | 2003-03-17 19:46:11 +0000 | [diff] [blame] | 1957 | PyObject_SelfIter, /* tp_iter */ |
Raymond Hettinger | 60eca93 | 2003-02-09 06:40:58 +0000 | [diff] [blame] | 1958 | (iternextfunc)izip_next, /* tp_iternext */ |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1959 | 0, /* tp_methods */ |
| 1960 | 0, /* tp_members */ |
| 1961 | 0, /* tp_getset */ |
| 1962 | 0, /* tp_base */ |
| 1963 | 0, /* tp_dict */ |
| 1964 | 0, /* tp_descr_get */ |
| 1965 | 0, /* tp_descr_set */ |
| 1966 | 0, /* tp_dictoffset */ |
| 1967 | 0, /* tp_init */ |
Raymond Hettinger | bfef18c | 2003-05-23 03:55:42 +0000 | [diff] [blame] | 1968 | 0, /* tp_alloc */ |
Raymond Hettinger | 60eca93 | 2003-02-09 06:40:58 +0000 | [diff] [blame] | 1969 | izip_new, /* tp_new */ |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1970 | PyObject_GC_Del, /* tp_free */ |
| 1971 | }; |
| 1972 | |
| 1973 | |
| 1974 | /* repeat object ************************************************************/ |
| 1975 | |
| 1976 | typedef struct { |
| 1977 | PyObject_HEAD |
| 1978 | PyObject *element; |
Raymond Hettinger | 61fe64d | 2003-02-23 04:40:07 +0000 | [diff] [blame] | 1979 | long cnt; |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1980 | } repeatobject; |
| 1981 | |
Raymond Hettinger | 1d7a348 | 2003-07-14 07:07:12 +0000 | [diff] [blame] | 1982 | static PyTypeObject repeat_type; |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1983 | |
| 1984 | static PyObject * |
| 1985 | repeat_new(PyTypeObject *type, PyObject *args, PyObject *kwds) |
| 1986 | { |
| 1987 | repeatobject *ro; |
| 1988 | PyObject *element; |
Raymond Hettinger | 61fe64d | 2003-02-23 04:40:07 +0000 | [diff] [blame] | 1989 | long cnt = -1; |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1990 | |
Raymond Hettinger | 61fe64d | 2003-02-23 04:40:07 +0000 | [diff] [blame] | 1991 | if (!PyArg_ParseTuple(args, "O|l:repeat", &element, &cnt)) |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1992 | return NULL; |
| 1993 | |
Raymond Hettinger | 7c2bb5b | 2003-05-03 05:59:48 +0000 | [diff] [blame] | 1994 | if (PyTuple_Size(args) == 2 && cnt < 0) |
| 1995 | cnt = 0; |
| 1996 | |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 1997 | ro = (repeatobject *)type->tp_alloc(type, 0); |
| 1998 | if (ro == NULL) |
| 1999 | return NULL; |
| 2000 | Py_INCREF(element); |
| 2001 | ro->element = element; |
Raymond Hettinger | 61fe64d | 2003-02-23 04:40:07 +0000 | [diff] [blame] | 2002 | ro->cnt = cnt; |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 2003 | return (PyObject *)ro; |
| 2004 | } |
| 2005 | |
| 2006 | static void |
| 2007 | repeat_dealloc(repeatobject *ro) |
| 2008 | { |
| 2009 | PyObject_GC_UnTrack(ro); |
| 2010 | Py_XDECREF(ro->element); |
| 2011 | ro->ob_type->tp_free(ro); |
| 2012 | } |
| 2013 | |
| 2014 | static int |
| 2015 | repeat_traverse(repeatobject *ro, visitproc visit, void *arg) |
| 2016 | { |
| 2017 | if (ro->element) |
| 2018 | return visit(ro->element, arg); |
| 2019 | return 0; |
| 2020 | } |
| 2021 | |
| 2022 | static PyObject * |
| 2023 | repeat_next(repeatobject *ro) |
| 2024 | { |
Raymond Hettinger | 61fe64d | 2003-02-23 04:40:07 +0000 | [diff] [blame] | 2025 | if (ro->cnt == 0) |
| 2026 | return NULL; |
| 2027 | if (ro->cnt > 0) |
| 2028 | ro->cnt--; |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 2029 | Py_INCREF(ro->element); |
| 2030 | return ro->element; |
| 2031 | } |
| 2032 | |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 2033 | PyDoc_STRVAR(repeat_doc, |
Raymond Hettinger | 61fe64d | 2003-02-23 04:40:07 +0000 | [diff] [blame] | 2034 | "repeat(element [,times]) -> create an iterator which returns the element\n\ |
| 2035 | for the specified number of times. If not specified, returns the element\n\ |
| 2036 | endlessly."); |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 2037 | |
Raymond Hettinger | 1d7a348 | 2003-07-14 07:07:12 +0000 | [diff] [blame] | 2038 | static PyTypeObject repeat_type = { |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 2039 | PyObject_HEAD_INIT(NULL) |
| 2040 | 0, /* ob_size */ |
| 2041 | "itertools.repeat", /* tp_name */ |
| 2042 | sizeof(repeatobject), /* tp_basicsize */ |
| 2043 | 0, /* tp_itemsize */ |
| 2044 | /* methods */ |
Raymond Hettinger | 60eca93 | 2003-02-09 06:40:58 +0000 | [diff] [blame] | 2045 | (destructor)repeat_dealloc, /* tp_dealloc */ |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 2046 | 0, /* tp_print */ |
| 2047 | 0, /* tp_getattr */ |
| 2048 | 0, /* tp_setattr */ |
| 2049 | 0, /* tp_compare */ |
| 2050 | 0, /* tp_repr */ |
| 2051 | 0, /* tp_as_number */ |
| 2052 | 0, /* tp_as_sequence */ |
| 2053 | 0, /* tp_as_mapping */ |
| 2054 | 0, /* tp_hash */ |
| 2055 | 0, /* tp_call */ |
| 2056 | 0, /* tp_str */ |
| 2057 | PyObject_GenericGetAttr, /* tp_getattro */ |
| 2058 | 0, /* tp_setattro */ |
| 2059 | 0, /* tp_as_buffer */ |
| 2060 | Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC | |
| 2061 | Py_TPFLAGS_BASETYPE, /* tp_flags */ |
Raymond Hettinger | 60eca93 | 2003-02-09 06:40:58 +0000 | [diff] [blame] | 2062 | repeat_doc, /* tp_doc */ |
| 2063 | (traverseproc)repeat_traverse, /* tp_traverse */ |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 2064 | 0, /* tp_clear */ |
| 2065 | 0, /* tp_richcompare */ |
| 2066 | 0, /* tp_weaklistoffset */ |
Raymond Hettinger | 1da1dbf | 2003-03-17 19:46:11 +0000 | [diff] [blame] | 2067 | PyObject_SelfIter, /* tp_iter */ |
Raymond Hettinger | 60eca93 | 2003-02-09 06:40:58 +0000 | [diff] [blame] | 2068 | (iternextfunc)repeat_next, /* tp_iternext */ |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 2069 | 0, /* tp_methods */ |
| 2070 | 0, /* tp_members */ |
| 2071 | 0, /* tp_getset */ |
| 2072 | 0, /* tp_base */ |
| 2073 | 0, /* tp_dict */ |
| 2074 | 0, /* tp_descr_get */ |
| 2075 | 0, /* tp_descr_set */ |
| 2076 | 0, /* tp_dictoffset */ |
| 2077 | 0, /* tp_init */ |
Raymond Hettinger | bfef18c | 2003-05-23 03:55:42 +0000 | [diff] [blame] | 2078 | 0, /* tp_alloc */ |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 2079 | repeat_new, /* tp_new */ |
| 2080 | PyObject_GC_Del, /* tp_free */ |
| 2081 | }; |
| 2082 | |
| 2083 | |
| 2084 | /* module level code ********************************************************/ |
| 2085 | |
| 2086 | PyDoc_STRVAR(module_doc, |
| 2087 | "Functional tools for creating and using iterators.\n\ |
| 2088 | \n\ |
| 2089 | Infinite iterators:\n\ |
| 2090 | count([n]) --> n, n+1, n+2, ...\n\ |
Raymond Hettinger | 61fe64d | 2003-02-23 04:40:07 +0000 | [diff] [blame] | 2091 | cycle(p) --> p0, p1, ... plast, p0, p1, ...\n\ |
Andrew M. Kuchling | dff694b | 2003-04-14 15:31:27 +0000 | [diff] [blame] | 2092 | 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] | 2093 | \n\ |
| 2094 | Iterators terminating on the shortest input sequence:\n\ |
| 2095 | izip(p, q, ...) --> (p[0], q[0]), (p[1], q[1]), ... \n\ |
Raymond Hettinger | 60eca93 | 2003-02-09 06:40:58 +0000 | [diff] [blame] | 2096 | ifilter(pred, seq) --> elements of seq where pred(elem) is True\n\ |
| 2097 | ifilterfalse(pred, seq) --> elements of seq where pred(elem) is False\n\ |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 2098 | islice(seq, [start,] stop [, step]) --> elements from\n\ |
| 2099 | seq[start:stop:step]\n\ |
| 2100 | imap(fun, p, q, ...) --> fun(p0, q0), fun(p1, q1), ...\n\ |
| 2101 | starmap(fun, seq) --> fun(*seq[0]), fun(*seq[1]), ...\n\ |
Raymond Hettinger | ad983e7 | 2003-11-12 14:32:26 +0000 | [diff] [blame] | 2102 | tee(it, n=2) --> (it1, it2 , ... itn) splits one iterator into n\n\ |
Raymond Hettinger | 61fe64d | 2003-02-23 04:40:07 +0000 | [diff] [blame] | 2103 | chain(p, q, ...) --> p0, p1, ... plast, q0, q1, ... \n\ |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 2104 | takewhile(pred, seq) --> seq[0], seq[1], until pred fails\n\ |
| 2105 | dropwhile(pred, seq) --> seq[n], seq[n+1], starting when pred fails\n\ |
| 2106 | "); |
| 2107 | |
| 2108 | |
Raymond Hettinger | ad983e7 | 2003-11-12 14:32:26 +0000 | [diff] [blame] | 2109 | static PyMethodDef module_methods[] = { |
| 2110 | {"tee", (PyCFunction)tee, METH_VARARGS, tee_doc}, |
| 2111 | {NULL, NULL} /* sentinel */ |
| 2112 | }; |
| 2113 | |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 2114 | PyMODINIT_FUNC |
| 2115 | inititertools(void) |
| 2116 | { |
Raymond Hettinger | 60eca93 | 2003-02-09 06:40:58 +0000 | [diff] [blame] | 2117 | int i; |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 2118 | PyObject *m; |
Raymond Hettinger | 60eca93 | 2003-02-09 06:40:58 +0000 | [diff] [blame] | 2119 | char *name; |
| 2120 | PyTypeObject *typelist[] = { |
Raymond Hettinger | 61fe64d | 2003-02-23 04:40:07 +0000 | [diff] [blame] | 2121 | &cycle_type, |
Raymond Hettinger | 60eca93 | 2003-02-09 06:40:58 +0000 | [diff] [blame] | 2122 | &dropwhile_type, |
| 2123 | &takewhile_type, |
| 2124 | &islice_type, |
| 2125 | &starmap_type, |
| 2126 | &imap_type, |
Raymond Hettinger | 61fe64d | 2003-02-23 04:40:07 +0000 | [diff] [blame] | 2127 | &chain_type, |
Raymond Hettinger | 60eca93 | 2003-02-09 06:40:58 +0000 | [diff] [blame] | 2128 | &ifilter_type, |
| 2129 | &ifilterfalse_type, |
| 2130 | &count_type, |
| 2131 | &izip_type, |
| 2132 | &repeat_type, |
| 2133 | NULL |
| 2134 | }; |
| 2135 | |
Raymond Hettinger | ad983e7 | 2003-11-12 14:32:26 +0000 | [diff] [blame] | 2136 | m = Py_InitModule3("itertools", module_methods, module_doc); |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 2137 | |
Raymond Hettinger | 60eca93 | 2003-02-09 06:40:58 +0000 | [diff] [blame] | 2138 | for (i=0 ; typelist[i] != NULL ; i++) { |
| 2139 | if (PyType_Ready(typelist[i]) < 0) |
| 2140 | return; |
Raymond Hettinger | d449eab | 2003-05-22 16:32:58 +0000 | [diff] [blame] | 2141 | name = strchr(typelist[i]->tp_name, '.'); |
Raymond Hettinger | 61fe64d | 2003-02-23 04:40:07 +0000 | [diff] [blame] | 2142 | assert (name != NULL); |
Raymond Hettinger | 60eca93 | 2003-02-09 06:40:58 +0000 | [diff] [blame] | 2143 | Py_INCREF(typelist[i]); |
Raymond Hettinger | d449eab | 2003-05-22 16:32:58 +0000 | [diff] [blame] | 2144 | PyModule_AddObject(m, name+1, (PyObject *)typelist[i]); |
Raymond Hettinger | 60eca93 | 2003-02-09 06:40:58 +0000 | [diff] [blame] | 2145 | } |
Raymond Hettinger | ad983e7 | 2003-11-12 14:32:26 +0000 | [diff] [blame] | 2146 | |
| 2147 | if (PyType_Ready(&teedataobject_type) < 0) |
| 2148 | return; |
| 2149 | if (PyType_Ready(&tee_type) < 0) |
| 2150 | return; |
| 2151 | |
Raymond Hettinger | 96ef811 | 2003-02-01 00:10:11 +0000 | [diff] [blame] | 2152 | } |