{{ message }}
forked from python/cpython
-
Notifications
You must be signed in to change notification settings - Fork 27
Expand file tree
/
Copy pathenumobject.c
More file actions
545 lines (486 loc) · 16.8 KB
/
Copy pathenumobject.c
File metadata and controls
545 lines (486 loc) · 16.8 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
/* enumerate object */
#include "Python.h"
#include "pycore_call.h" // _PyObject_CallNoArgs()
#include "pycore_long.h" // _PyLong_GetOne()
#include "pycore_modsupport.h" // _PyArg_NoKwnames()
#include "pycore_object.h" // _PyObject_GC_TRACK()
#include "clinic/enumobject.c.h"
/*[clinic input]
class enumerate "enumobject *" "&PyEnum_Type"
class reversed "reversedobject *" "&PyReversed_Type"
[clinic start generated code]*/
/*[clinic end generated code: output=da39a3ee5e6b4b0d input=d2dfdf1a88c88975]*/
typedef struct {
PyObject_HEAD
Py_ssize_t en_index; /* current index of enumeration */
PyObject* en_sit; /* secondary iterator of enumeration */
PyObject* en_result; /* result tuple */
PyObject* en_longindex; /* index for sequences >= PY_SSIZE_T_MAX */
PyObject* one; /* borrowed reference */
} enumobject;
/*[clinic input]
@classmethod
enumerate.__new__ as enum_new
iterable: object
an object supporting iteration
start: object = 0
Return an enumerate object.
The enumerate object yields pairs containing a count (from start, which
defaults to zero) and a value yielded by the iterable argument.
enumerate is useful for obtaining an indexed list:
(0, seq[0]), (1, seq[1]), (2, seq[2]), ...
[clinic start generated code]*/
static PyObject *
enum_new_impl(PyTypeObject *type, PyObject *iterable, PyObject *start)
/*[clinic end generated code: output=e95e6e439f812c10 input=782e4911efcb8acf]*/
{
enumobject *en;
en = (enumobject *)type->tp_alloc(type, 0);
if (en == NULL)
return NULL;
if (start != NULL) {
start = PyNumber_Index(start);
if (start == NULL) {
Py_DECREF(en);
return NULL;
}
assert(PyLong_Check(start));
en->en_index = PyLong_AsSsize_t(start);
if (en->en_index == -1 && PyErr_Occurred()) {
PyErr_Clear();
en->en_index = PY_SSIZE_T_MAX;
en->en_longindex = start;
} else {
en->en_longindex = NULL;
Py_DECREF(start);
}
} else {
en->en_index = 0;
en->en_longindex = NULL;
}
en->en_sit = PyObject_GetIter(iterable);
if (en->en_sit == NULL) {
Py_DECREF(en);
return NULL;
}
en->en_result = PyTuple_Pack(2, Py_None, Py_None);
if (en->en_result == NULL) {
Py_DECREF(en);
return NULL;
}
en->one = _PyLong_GetOne(); /* borrowed reference */
return (PyObject *)en;
}
static int check_keyword(PyObject *kwnames, int index,
const char *name)
{
PyObject *kw = PyTuple_GET_ITEM(kwnames, index);
if (!_PyUnicode_EqualToASCIIString(kw, name)) {
PyErr_Format(PyExc_TypeError,
"'%S' is an invalid keyword argument for enumerate()", kw);
return 0;
}
return 1;
}
// TODO: Use AC when bpo-43447 is supported
static PyObject *
enumerate_vectorcall(PyObject *type, PyObject *const *args,
size_t nargsf, PyObject *kwnames)
{
PyTypeObject *tp = _PyType_CAST(type);
Py_ssize_t nargs = PyVectorcall_NARGS(nargsf);
Py_ssize_t nkwargs = 0;
if (kwnames != NULL) {
nkwargs = PyTuple_GET_SIZE(kwnames);
}
// Manually implement enumerate(iterable, start=...)
if (nargs + nkwargs == 2) {
if (nkwargs == 1) {
if (!check_keyword(kwnames, 0, "start")) {
return NULL;
}
} else if (nkwargs == 2) {
PyObject *kw0 = PyTuple_GET_ITEM(kwnames, 0);
if (_PyUnicode_EqualToASCIIString(kw0, "start")) {
if (!check_keyword(kwnames, 1, "iterable")) {
return NULL;
}
return enum_new_impl(tp, args[1], args[0]);
}
if (!check_keyword(kwnames, 0, "iterable") ||
!check_keyword(kwnames, 1, "start")) {
return NULL;
}
}
return enum_new_impl(tp, args[0], args[1]);
}
if (nargs + nkwargs == 1) {
if (nkwargs == 1 && !check_keyword(kwnames, 0, "iterable")) {
return NULL;
}
return enum_new_impl(tp, args[0], NULL);
}
if (nargs == 0) {
PyErr_SetString(PyExc_TypeError,
"enumerate() missing required argument 'iterable'");
return NULL;
}
PyErr_Format(PyExc_TypeError,
"enumerate() takes at most 2 arguments (%d given)", nargs + nkwargs);
return NULL;
}
static void
enum_dealloc(enumobject *en)
{
PyObject_GC_UnTrack(en);
Py_XDECREF(en->en_sit);
Py_XDECREF(en->en_result);
Py_XDECREF(en->en_longindex);
Py_TYPE(en)->tp_free(en);
}
static int
enum_traverse(enumobject *en, visitproc visit, void *arg)
{
Py_VISIT(en->en_sit);
Py_VISIT(en->en_result);
Py_VISIT(en->en_longindex);
return 0;
}
static PyObject *
enum_next_long(enumobject *en, PyObject* next_item)
{
PyObject *result = en->en_result;
PyObject *next_index;
PyObject *stepped_up;
PyObject *old_index;
PyObject *old_item;
if (en->en_longindex == NULL) {
en->en_longindex = PyLong_FromSsize_t(PY_SSIZE_T_MAX);
if (en->en_longindex == NULL) {
Py_DECREF(next_item);
return NULL;
}
}
next_index = en->en_longindex;
assert(next_index != NULL);
stepped_up = PyNumber_Add(next_index, en->one);
if (stepped_up == NULL) {
Py_DECREF(next_item);
return NULL;
}
en->en_longindex = stepped_up;
if (Py_REFCNT(result) == 1) {
Py_INCREF(result);
old_index = PyTuple_GET_ITEM(result, 0);
old_item = PyTuple_GET_ITEM(result, 1);
PyTuple_SET_ITEM(result, 0, next_index);
PyTuple_SET_ITEM(result, 1, next_item);
Py_DECREF(old_index);
Py_DECREF(old_item);
// bpo-42536: The GC may have untracked this result tuple. Since we're
// recycling it, make sure it's tracked again:
if (!_PyObject_GC_IS_TRACKED(result)) {
_PyObject_GC_TRACK(result);
}
return result;
}
result = PyTuple_New(2);
if (result == NULL) {
Py_DECREF(next_index);
Py_DECREF(next_item);
return NULL;
}
PyTuple_SET_ITEM(result, 0, next_index);
PyTuple_SET_ITEM(result, 1, next_item);
return result;
}
static PyObject *
enum_next(enumobject *en)
{
PyObject *next_index;
PyObject *next_item;
PyObject *result = en->en_result;
PyObject *it = en->en_sit;
PyObject *old_index;
PyObject *old_item;
next_item = (*Py_TYPE(it)->tp_iternext)(it);
if (next_item == NULL)
return NULL;
if (en->en_index == PY_SSIZE_T_MAX)
return enum_next_long(en, next_item);
next_index = PyLong_FromSsize_t(en->en_index);
if (next_index == NULL) {
Py_DECREF(next_item);
return NULL;
}
en->en_index++;
if (Py_REFCNT(result) == 1) {
Py_INCREF(result);
old_index = PyTuple_GET_ITEM(result, 0);
old_item = PyTuple_GET_ITEM(result, 1);
PyTuple_SET_ITEM(result, 0, next_index);
PyTuple_SET_ITEM(result, 1, next_item);
Py_DECREF(old_index);
Py_DECREF(old_item);
// bpo-42536: The GC may have untracked this result tuple. Since we're
// recycling it, make sure it's tracked again:
if (!_PyObject_GC_IS_TRACKED(result)) {
_PyObject_GC_TRACK(result);
}
return result;
}
result = PyTuple_New(2);
if (result == NULL) {
Py_DECREF(next_index);
Py_DECREF(next_item);
return NULL;
}
PyTuple_SET_ITEM(result, 0, next_index);
PyTuple_SET_ITEM(result, 1, next_item);
return result;
}
static PyObject *
enum_reduce(enumobject *en, PyObject *Py_UNUSED(ignored))
{
if (en->en_longindex != NULL)
return Py_BuildValue("O(OO)", Py_TYPE(en), en->en_sit, en->en_longindex);
else
return Py_BuildValue("O(On)", Py_TYPE(en), en->en_sit, en->en_index);
}
PyDoc_STRVAR(reduce_doc, "Return state information for pickling.");
static PyMethodDef enum_methods[] = {
{"__reduce__", (PyCFunction)enum_reduce, METH_NOARGS, reduce_doc},
{"__class_getitem__", Py_GenericAlias,
METH_O|METH_CLASS, PyDoc_STR("See PEP 585")},
{NULL, NULL} /* sentinel */
};
PyTypeObject PyEnum_Type = {
PyVarObject_HEAD_INIT(&PyType_Type, 0)
"enumerate", /* tp_name */
sizeof(enumobject), /* tp_basicsize */
0, /* tp_itemsize */
/* methods */
(destructor)enum_dealloc, /* tp_dealloc */
0, /* tp_vectorcall_offset */
0, /* tp_getattr */
0, /* tp_setattr */
0, /* tp_as_async */
0, /* tp_repr */
0, /* tp_as_number */
0, /* tp_as_sequence */
0, /* tp_as_mapping */
0, /* tp_hash */
0, /* tp_call */
0, /* tp_str */
PyObject_GenericGetAttr, /* tp_getattro */
0, /* tp_setattro */
0, /* tp_as_buffer */
Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC |
Py_TPFLAGS_BASETYPE, /* tp_flags */
enum_new__doc__, /* tp_doc */
(traverseproc)enum_traverse, /* tp_traverse */
0, /* tp_clear */
0, /* tp_richcompare */
0, /* tp_weaklistoffset */
PyObject_SelfIter, /* tp_iter */
(iternextfunc)enum_next, /* tp_iternext */
enum_methods, /* tp_methods */
0, /* tp_members */
0, /* tp_getset */
0, /* tp_base */
0, /* tp_dict */
0, /* tp_descr_get */
0, /* tp_descr_set */
0, /* tp_dictoffset */
0, /* tp_init */
PyType_GenericAlloc, /* tp_alloc */
enum_new, /* tp_new */
PyObject_GC_Del, /* tp_free */
.tp_vectorcall = (vectorcallfunc)enumerate_vectorcall
};
/* Reversed Object ***************************************************************/
typedef struct {
PyObject_HEAD
Py_ssize_t index;
PyObject* seq;
} reversedobject;
/*[clinic input]
@classmethod
reversed.__new__ as reversed_new
sequence as seq: object
/
Return a reverse iterator over the values of the given sequence.
[clinic start generated code]*/
static PyObject *
reversed_new_impl(PyTypeObject *type, PyObject *seq)
/*[clinic end generated code: output=f7854cc1df26f570 input=aeb720361e5e3f1d]*/
{
Py_ssize_t n;
PyObject *reversed_meth;
reversedobject *ro;
reversed_meth = _PyObject_LookupSpecial(seq, &_Py_ID(__reversed__));
if (reversed_meth == Py_None) {
Py_DECREF(reversed_meth);
PyErr_Format(PyExc_TypeError,
"'%.200s' object is not reversible",
Py_TYPE(seq)->tp_name);
return NULL;
}
if (reversed_meth != NULL) {
PyObject *res = _PyObject_CallNoArgs(reversed_meth);
Py_DECREF(reversed_meth);
return res;
}
else if (PyErr_Occurred())
return NULL;
if (!PySequence_Check(seq)) {
PyErr_Format(PyExc_TypeError,
"'%.200s' object is not reversible",
Py_TYPE(seq)->tp_name);
return NULL;
}
n = PySequence_Size(seq);
if (n == -1)
return NULL;
ro = (reversedobject *)type->tp_alloc(type, 0);
if (ro == NULL)
return NULL;
ro->index = n-1;
ro->seq = Py_NewRef(seq);
return (PyObject *)ro;
}
static PyObject *
reversed_vectorcall(PyObject *type, PyObject * const*args,
size_t nargsf, PyObject *kwnames)
{
if (!_PyArg_NoKwnames("reversed", kwnames)) {
return NULL;
}
Py_ssize_t nargs = PyVectorcall_NARGS(nargsf);
if (!_PyArg_CheckPositional("reversed", nargs, 1, 1)) {
return NULL;
}
return reversed_new_impl(_PyType_CAST(type), args[0]);
}
static void
reversed_dealloc(reversedobject *ro)
{
PyObject_GC_UnTrack(ro);
Py_XDECREF(ro->seq);
Py_TYPE(ro)->tp_free(ro);
}
static int
reversed_traverse(reversedobject *ro, visitproc visit, void *arg)
{
Py_VISIT(ro->seq);
return 0;
}
static PyObject *
reversed_next(reversedobject *ro)
{
PyObject *item;
Py_ssize_t index = ro->index;
if (index >= 0) {
item = PySequence_GetItem(ro->seq, index);
if (item != NULL) {
ro->index--;
return item;
}
if (PyErr_ExceptionMatches(PyExc_IndexError) ||
PyErr_ExceptionMatches(PyExc_StopIteration))
PyErr_Clear();
}
ro->index = -1;
Py_CLEAR(ro->seq);
return NULL;
}
static PyObject *
reversed_len(reversedobject *ro, PyObject *Py_UNUSED(ignored))
{
Py_ssize_t position, seqsize;
if (ro->seq == NULL)
return PyLong_FromLong(0);
seqsize = PySequence_Size(ro->seq);
if (seqsize == -1)
return NULL;
position = ro->index + 1;
return PyLong_FromSsize_t((seqsize < position) ? 0 : position);
}
PyDoc_STRVAR(length_hint_doc, "Private method returning an estimate of len(list(it)).");
static PyObject *
reversed_reduce(reversedobject *ro, PyObject *Py_UNUSED(ignored))
{
if (ro->seq)
return Py_BuildValue("O(O)n", Py_TYPE(ro), ro->seq, ro->index);
else
return Py_BuildValue("O(())", Py_TYPE(ro));
}
static PyObject *
reversed_setstate(reversedobject *ro, PyObject *state)
{
Py_ssize_t index = PyLong_AsSsize_t(state);
if (index == -1 && PyErr_Occurred())
return NULL;
if (ro->seq != 0) {
Py_ssize_t n = PySequence_Size(ro->seq);
if (n < 0)
return NULL;
if (index < -1)
index = -1;
else if (index > n-1)
index = n-1;
ro->index = index;
}
Py_RETURN_NONE;
}
PyDoc_STRVAR(setstate_doc, "Set state information for unpickling.");
static PyMethodDef reversediter_methods[] = {
{"__length_hint__", (PyCFunction)reversed_len, METH_NOARGS, length_hint_doc},
{"__reduce__", (PyCFunction)reversed_reduce, METH_NOARGS, reduce_doc},
{"__setstate__", (PyCFunction)reversed_setstate, METH_O, setstate_doc},
{NULL, NULL} /* sentinel */
};
PyTypeObject PyReversed_Type = {
PyVarObject_HEAD_INIT(&PyType_Type, 0)
"reversed", /* tp_name */
sizeof(reversedobject), /* tp_basicsize */
0, /* tp_itemsize */
/* methods */
(destructor)reversed_dealloc, /* tp_dealloc */
0, /* tp_vectorcall_offset */
0, /* tp_getattr */
0, /* tp_setattr */
0, /* tp_as_async */
0, /* tp_repr */
0, /* tp_as_number */
0, /* tp_as_sequence */
0, /* tp_as_mapping */
0, /* tp_hash */
0, /* tp_call */
0, /* tp_str */
PyObject_GenericGetAttr, /* tp_getattro */
0, /* tp_setattro */
0, /* tp_as_buffer */
Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC |
Py_TPFLAGS_BASETYPE, /* tp_flags */
reversed_new__doc__, /* tp_doc */
(traverseproc)reversed_traverse,/* tp_traverse */
0, /* tp_clear */
0, /* tp_richcompare */
0, /* tp_weaklistoffset */
PyObject_SelfIter, /* tp_iter */
(iternextfunc)reversed_next, /* tp_iternext */
reversediter_methods, /* tp_methods */
0, /* tp_members */
0, /* tp_getset */
0, /* tp_base */
0, /* tp_dict */
0, /* tp_descr_get */
0, /* tp_descr_set */
0, /* tp_dictoffset */
0, /* tp_init */
PyType_GenericAlloc, /* tp_alloc */
reversed_new, /* tp_new */
PyObject_GC_Del, /* tp_free */
.tp_vectorcall = (vectorcallfunc)reversed_vectorcall,
};
You can’t perform that action at this time.