Raymond Hettinger | 9c323f8 | 2005-02-28 19:39:44 +0000 | [diff] [blame] | 1 | |
| 2 | #include "Python.h" |
| 3 | #include "structmember.h" |
| 4 | |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 5 | /* _functools module written and maintained |
Raymond Hettinger | 9c323f8 | 2005-02-28 19:39:44 +0000 | [diff] [blame] | 6 | by Hye-Shik Chang <perky@FreeBSD.org> |
| 7 | with adaptations by Raymond Hettinger <python@rcn.com> |
Thomas Wouters | 4d70c3d | 2006-06-08 14:42:34 +0000 | [diff] [blame] | 8 | Copyright (c) 2004, 2005, 2006 Python Software Foundation. |
Raymond Hettinger | 9c323f8 | 2005-02-28 19:39:44 +0000 | [diff] [blame] | 9 | All rights reserved. |
| 10 | */ |
| 11 | |
| 12 | /* partial object **********************************************************/ |
| 13 | |
| 14 | typedef struct { |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 15 | PyObject_HEAD |
| 16 | PyObject *fn; |
| 17 | PyObject *args; |
| 18 | PyObject *kw; |
| 19 | PyObject *dict; |
| 20 | PyObject *weakreflist; /* List of weak references */ |
Raymond Hettinger | 9c323f8 | 2005-02-28 19:39:44 +0000 | [diff] [blame] | 21 | } partialobject; |
| 22 | |
| 23 | static PyTypeObject partial_type; |
| 24 | |
| 25 | static PyObject * |
| 26 | partial_new(PyTypeObject *type, PyObject *args, PyObject *kw) |
| 27 | { |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 28 | PyObject *func; |
| 29 | partialobject *pto; |
Raymond Hettinger | 9c323f8 | 2005-02-28 19:39:44 +0000 | [diff] [blame] | 30 | |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 31 | if (PyTuple_GET_SIZE(args) < 1) { |
| 32 | PyErr_SetString(PyExc_TypeError, |
| 33 | "type 'partial' takes at least one argument"); |
| 34 | return NULL; |
| 35 | } |
Raymond Hettinger | 9c323f8 | 2005-02-28 19:39:44 +0000 | [diff] [blame] | 36 | |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 37 | func = PyTuple_GET_ITEM(args, 0); |
| 38 | if (!PyCallable_Check(func)) { |
| 39 | PyErr_SetString(PyExc_TypeError, |
| 40 | "the first argument must be callable"); |
| 41 | return NULL; |
| 42 | } |
Raymond Hettinger | 9c323f8 | 2005-02-28 19:39:44 +0000 | [diff] [blame] | 43 | |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 44 | /* create partialobject structure */ |
| 45 | pto = (partialobject *)type->tp_alloc(type, 0); |
| 46 | if (pto == NULL) |
| 47 | return NULL; |
Raymond Hettinger | 9c323f8 | 2005-02-28 19:39:44 +0000 | [diff] [blame] | 48 | |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 49 | pto->fn = func; |
| 50 | Py_INCREF(func); |
| 51 | pto->args = PyTuple_GetSlice(args, 1, PY_SSIZE_T_MAX); |
| 52 | if (pto->args == NULL) { |
| 53 | pto->kw = NULL; |
| 54 | Py_DECREF(pto); |
| 55 | return NULL; |
| 56 | } |
| 57 | if (kw != NULL) { |
| 58 | pto->kw = PyDict_Copy(kw); |
| 59 | if (pto->kw == NULL) { |
| 60 | Py_DECREF(pto); |
| 61 | return NULL; |
| 62 | } |
| 63 | } else { |
| 64 | pto->kw = Py_None; |
| 65 | Py_INCREF(Py_None); |
| 66 | } |
Raymond Hettinger | 9c323f8 | 2005-02-28 19:39:44 +0000 | [diff] [blame] | 67 | |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 68 | pto->weakreflist = NULL; |
| 69 | pto->dict = NULL; |
Raymond Hettinger | c8b6d1b | 2005-03-08 06:14:50 +0000 | [diff] [blame] | 70 | |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 71 | return (PyObject *)pto; |
Raymond Hettinger | 9c323f8 | 2005-02-28 19:39:44 +0000 | [diff] [blame] | 72 | } |
| 73 | |
| 74 | static void |
| 75 | partial_dealloc(partialobject *pto) |
| 76 | { |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 77 | PyObject_GC_UnTrack(pto); |
| 78 | if (pto->weakreflist != NULL) |
| 79 | PyObject_ClearWeakRefs((PyObject *) pto); |
| 80 | Py_XDECREF(pto->fn); |
| 81 | Py_XDECREF(pto->args); |
| 82 | Py_XDECREF(pto->kw); |
| 83 | Py_XDECREF(pto->dict); |
| 84 | Py_TYPE(pto)->tp_free(pto); |
Raymond Hettinger | 9c323f8 | 2005-02-28 19:39:44 +0000 | [diff] [blame] | 85 | } |
| 86 | |
| 87 | static PyObject * |
| 88 | partial_call(partialobject *pto, PyObject *args, PyObject *kw) |
| 89 | { |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 90 | PyObject *ret; |
| 91 | PyObject *argappl = NULL, *kwappl = NULL; |
Raymond Hettinger | 9c323f8 | 2005-02-28 19:39:44 +0000 | [diff] [blame] | 92 | |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 93 | assert (PyCallable_Check(pto->fn)); |
| 94 | assert (PyTuple_Check(pto->args)); |
| 95 | assert (pto->kw == Py_None || PyDict_Check(pto->kw)); |
Raymond Hettinger | 9c323f8 | 2005-02-28 19:39:44 +0000 | [diff] [blame] | 96 | |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 97 | if (PyTuple_GET_SIZE(pto->args) == 0) { |
| 98 | argappl = args; |
| 99 | Py_INCREF(args); |
| 100 | } else if (PyTuple_GET_SIZE(args) == 0) { |
| 101 | argappl = pto->args; |
| 102 | Py_INCREF(pto->args); |
| 103 | } else { |
| 104 | argappl = PySequence_Concat(pto->args, args); |
| 105 | if (argappl == NULL) |
| 106 | return NULL; |
| 107 | } |
Raymond Hettinger | 9c323f8 | 2005-02-28 19:39:44 +0000 | [diff] [blame] | 108 | |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 109 | if (pto->kw == Py_None) { |
| 110 | kwappl = kw; |
| 111 | Py_XINCREF(kw); |
| 112 | } else { |
| 113 | kwappl = PyDict_Copy(pto->kw); |
| 114 | if (kwappl == NULL) { |
| 115 | Py_DECREF(argappl); |
| 116 | return NULL; |
| 117 | } |
| 118 | if (kw != NULL) { |
| 119 | if (PyDict_Merge(kwappl, kw, 1) != 0) { |
| 120 | Py_DECREF(argappl); |
| 121 | Py_DECREF(kwappl); |
| 122 | return NULL; |
| 123 | } |
| 124 | } |
| 125 | } |
Raymond Hettinger | 9c323f8 | 2005-02-28 19:39:44 +0000 | [diff] [blame] | 126 | |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 127 | ret = PyObject_Call(pto->fn, argappl, kwappl); |
| 128 | Py_DECREF(argappl); |
| 129 | Py_XDECREF(kwappl); |
| 130 | return ret; |
Raymond Hettinger | 9c323f8 | 2005-02-28 19:39:44 +0000 | [diff] [blame] | 131 | } |
| 132 | |
| 133 | static int |
| 134 | partial_traverse(partialobject *pto, visitproc visit, void *arg) |
| 135 | { |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 136 | Py_VISIT(pto->fn); |
| 137 | Py_VISIT(pto->args); |
| 138 | Py_VISIT(pto->kw); |
| 139 | Py_VISIT(pto->dict); |
| 140 | return 0; |
Raymond Hettinger | 9c323f8 | 2005-02-28 19:39:44 +0000 | [diff] [blame] | 141 | } |
| 142 | |
| 143 | PyDoc_STRVAR(partial_doc, |
| 144 | "partial(func, *args, **keywords) - new function with partial application\n\ |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 145 | of the given arguments and keywords.\n"); |
Raymond Hettinger | 9c323f8 | 2005-02-28 19:39:44 +0000 | [diff] [blame] | 146 | |
| 147 | #define OFF(x) offsetof(partialobject, x) |
| 148 | static PyMemberDef partial_memberlist[] = { |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 149 | {"func", T_OBJECT, OFF(fn), READONLY, |
| 150 | "function object to use in future partial calls"}, |
| 151 | {"args", T_OBJECT, OFF(args), READONLY, |
| 152 | "tuple of arguments to future partial calls"}, |
| 153 | {"keywords", T_OBJECT, OFF(kw), READONLY, |
| 154 | "dictionary of keyword arguments to future partial calls"}, |
| 155 | {NULL} /* Sentinel */ |
Raymond Hettinger | 9c323f8 | 2005-02-28 19:39:44 +0000 | [diff] [blame] | 156 | }; |
| 157 | |
Raymond Hettinger | c8b6d1b | 2005-03-08 06:14:50 +0000 | [diff] [blame] | 158 | static PyObject * |
| 159 | partial_get_dict(partialobject *pto) |
| 160 | { |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 161 | if (pto->dict == NULL) { |
| 162 | pto->dict = PyDict_New(); |
| 163 | if (pto->dict == NULL) |
| 164 | return NULL; |
| 165 | } |
| 166 | Py_INCREF(pto->dict); |
| 167 | return pto->dict; |
Raymond Hettinger | c8b6d1b | 2005-03-08 06:14:50 +0000 | [diff] [blame] | 168 | } |
| 169 | |
| 170 | static int |
| 171 | partial_set_dict(partialobject *pto, PyObject *value) |
| 172 | { |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 173 | PyObject *tmp; |
Raymond Hettinger | c8b6d1b | 2005-03-08 06:14:50 +0000 | [diff] [blame] | 174 | |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 175 | /* It is illegal to del p.__dict__ */ |
| 176 | if (value == NULL) { |
| 177 | PyErr_SetString(PyExc_TypeError, |
| 178 | "a partial object's dictionary may not be deleted"); |
| 179 | return -1; |
| 180 | } |
| 181 | /* Can only set __dict__ to a dictionary */ |
| 182 | if (!PyDict_Check(value)) { |
| 183 | PyErr_SetString(PyExc_TypeError, |
| 184 | "setting partial object's dictionary to a non-dict"); |
| 185 | return -1; |
| 186 | } |
| 187 | tmp = pto->dict; |
| 188 | Py_INCREF(value); |
| 189 | pto->dict = value; |
| 190 | Py_XDECREF(tmp); |
| 191 | return 0; |
Raymond Hettinger | c8b6d1b | 2005-03-08 06:14:50 +0000 | [diff] [blame] | 192 | } |
| 193 | |
Georg Brandl | c2fb6c7 | 2006-02-21 17:49:57 +0000 | [diff] [blame] | 194 | static PyGetSetDef partial_getsetlist[] = { |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 195 | {"__dict__", (getter)partial_get_dict, (setter)partial_set_dict}, |
| 196 | {NULL} /* Sentinel */ |
Raymond Hettinger | c8b6d1b | 2005-03-08 06:14:50 +0000 | [diff] [blame] | 197 | }; |
| 198 | |
Alexander Belopolsky | 41e422a | 2010-12-01 20:05:49 +0000 | [diff] [blame] | 199 | static PyObject * |
| 200 | partial_repr(partialobject *pto) |
| 201 | { |
| 202 | PyObject *result; |
| 203 | PyObject *arglist; |
| 204 | PyObject *tmp; |
| 205 | Py_ssize_t i, n; |
| 206 | |
| 207 | arglist = PyUnicode_FromString(""); |
| 208 | if (arglist == NULL) { |
| 209 | return NULL; |
| 210 | } |
| 211 | /* Pack positional arguments */ |
| 212 | assert (PyTuple_Check(pto->args)); |
| 213 | n = PyTuple_GET_SIZE(pto->args); |
| 214 | for (i = 0; i < n; i++) { |
| 215 | tmp = PyUnicode_FromFormat("%U, %R", arglist, |
| 216 | PyTuple_GET_ITEM(pto->args, i)); |
| 217 | Py_DECREF(arglist); |
| 218 | if (tmp == NULL) |
| 219 | return NULL; |
| 220 | arglist = tmp; |
| 221 | } |
| 222 | /* Pack keyword arguments */ |
| 223 | assert (pto->kw == Py_None || PyDict_Check(pto->kw)); |
| 224 | if (pto->kw != Py_None) { |
| 225 | PyObject *key, *value; |
| 226 | for (i = 0; PyDict_Next(pto->kw, &i, &key, &value);) { |
| 227 | tmp = PyUnicode_FromFormat("%U, %U=%R", arglist, |
| 228 | key, value); |
| 229 | Py_DECREF(arglist); |
| 230 | if (tmp == NULL) |
| 231 | return NULL; |
| 232 | arglist = tmp; |
| 233 | } |
| 234 | } |
| 235 | result = PyUnicode_FromFormat("%s(%R%U)", Py_TYPE(pto)->tp_name, |
| 236 | pto->fn, arglist); |
| 237 | Py_DECREF(arglist); |
| 238 | return result; |
| 239 | } |
| 240 | |
Jack Diederich | e0cbd69 | 2009-04-01 04:27:09 +0000 | [diff] [blame] | 241 | /* Pickle strategy: |
| 242 | __reduce__ by itself doesn't support getting kwargs in the unpickle |
| 243 | operation so we define a __setstate__ that replaces all the information |
| 244 | about the partial. If we only replaced part of it someone would use |
Ezio Melotti | 1392500 | 2011-03-16 11:05:33 +0200 | [diff] [blame] | 245 | it as a hook to do strange things. |
Jack Diederich | e0cbd69 | 2009-04-01 04:27:09 +0000 | [diff] [blame] | 246 | */ |
| 247 | |
Antoine Pitrou | 69f7114 | 2009-05-24 21:25:49 +0000 | [diff] [blame] | 248 | static PyObject * |
Jack Diederich | e0cbd69 | 2009-04-01 04:27:09 +0000 | [diff] [blame] | 249 | partial_reduce(partialobject *pto, PyObject *unused) |
| 250 | { |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 251 | return Py_BuildValue("O(O)(OOOO)", Py_TYPE(pto), pto->fn, pto->fn, |
| 252 | pto->args, pto->kw, |
| 253 | pto->dict ? pto->dict : Py_None); |
Jack Diederich | e0cbd69 | 2009-04-01 04:27:09 +0000 | [diff] [blame] | 254 | } |
| 255 | |
Antoine Pitrou | 69f7114 | 2009-05-24 21:25:49 +0000 | [diff] [blame] | 256 | static PyObject * |
Serhiy Storchaka | 19c4e0d | 2013-02-04 12:47:24 +0200 | [diff] [blame] | 257 | partial_setstate(partialobject *pto, PyObject *state) |
Jack Diederich | e0cbd69 | 2009-04-01 04:27:09 +0000 | [diff] [blame] | 258 | { |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 259 | PyObject *fn, *fnargs, *kw, *dict; |
Serhiy Storchaka | 19c4e0d | 2013-02-04 12:47:24 +0200 | [diff] [blame] | 260 | if (!PyArg_ParseTuple(state, "OOOO", |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 261 | &fn, &fnargs, &kw, &dict)) |
| 262 | return NULL; |
| 263 | Py_XDECREF(pto->fn); |
| 264 | Py_XDECREF(pto->args); |
| 265 | Py_XDECREF(pto->kw); |
| 266 | Py_XDECREF(pto->dict); |
| 267 | pto->fn = fn; |
| 268 | pto->args = fnargs; |
| 269 | pto->kw = kw; |
| 270 | if (dict != Py_None) { |
| 271 | pto->dict = dict; |
| 272 | Py_INCREF(dict); |
| 273 | } else { |
| 274 | pto->dict = NULL; |
| 275 | } |
| 276 | Py_INCREF(fn); |
| 277 | Py_INCREF(fnargs); |
| 278 | Py_INCREF(kw); |
| 279 | Py_RETURN_NONE; |
Jack Diederich | e0cbd69 | 2009-04-01 04:27:09 +0000 | [diff] [blame] | 280 | } |
| 281 | |
| 282 | static PyMethodDef partial_methods[] = { |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 283 | {"__reduce__", (PyCFunction)partial_reduce, METH_NOARGS}, |
Serhiy Storchaka | 19c4e0d | 2013-02-04 12:47:24 +0200 | [diff] [blame] | 284 | {"__setstate__", (PyCFunction)partial_setstate, METH_O}, |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 285 | {NULL, NULL} /* sentinel */ |
Jack Diederich | e0cbd69 | 2009-04-01 04:27:09 +0000 | [diff] [blame] | 286 | }; |
| 287 | |
Raymond Hettinger | 9c323f8 | 2005-02-28 19:39:44 +0000 | [diff] [blame] | 288 | static PyTypeObject partial_type = { |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 289 | PyVarObject_HEAD_INIT(NULL, 0) |
| 290 | "functools.partial", /* tp_name */ |
| 291 | sizeof(partialobject), /* tp_basicsize */ |
| 292 | 0, /* tp_itemsize */ |
| 293 | /* methods */ |
| 294 | (destructor)partial_dealloc, /* tp_dealloc */ |
| 295 | 0, /* tp_print */ |
| 296 | 0, /* tp_getattr */ |
| 297 | 0, /* tp_setattr */ |
| 298 | 0, /* tp_reserved */ |
Alexander Belopolsky | 41e422a | 2010-12-01 20:05:49 +0000 | [diff] [blame] | 299 | (reprfunc)partial_repr, /* tp_repr */ |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 300 | 0, /* tp_as_number */ |
| 301 | 0, /* tp_as_sequence */ |
| 302 | 0, /* tp_as_mapping */ |
| 303 | 0, /* tp_hash */ |
| 304 | (ternaryfunc)partial_call, /* tp_call */ |
| 305 | 0, /* tp_str */ |
| 306 | PyObject_GenericGetAttr, /* tp_getattro */ |
| 307 | PyObject_GenericSetAttr, /* tp_setattro */ |
| 308 | 0, /* tp_as_buffer */ |
| 309 | Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC | |
| 310 | Py_TPFLAGS_BASETYPE, /* tp_flags */ |
| 311 | partial_doc, /* tp_doc */ |
| 312 | (traverseproc)partial_traverse, /* tp_traverse */ |
| 313 | 0, /* tp_clear */ |
| 314 | 0, /* tp_richcompare */ |
| 315 | offsetof(partialobject, weakreflist), /* tp_weaklistoffset */ |
| 316 | 0, /* tp_iter */ |
| 317 | 0, /* tp_iternext */ |
| 318 | partial_methods, /* tp_methods */ |
| 319 | partial_memberlist, /* tp_members */ |
| 320 | partial_getsetlist, /* tp_getset */ |
| 321 | 0, /* tp_base */ |
| 322 | 0, /* tp_dict */ |
| 323 | 0, /* tp_descr_get */ |
| 324 | 0, /* tp_descr_set */ |
| 325 | offsetof(partialobject, dict), /* tp_dictoffset */ |
| 326 | 0, /* tp_init */ |
| 327 | 0, /* tp_alloc */ |
| 328 | partial_new, /* tp_new */ |
| 329 | PyObject_GC_Del, /* tp_free */ |
Raymond Hettinger | 9c323f8 | 2005-02-28 19:39:44 +0000 | [diff] [blame] | 330 | }; |
| 331 | |
| 332 | |
Guido van Rossum | 0919a1a | 2006-08-26 20:49:04 +0000 | [diff] [blame] | 333 | /* reduce (used to be a builtin) ********************************************/ |
| 334 | |
| 335 | static PyObject * |
| 336 | functools_reduce(PyObject *self, PyObject *args) |
| 337 | { |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 338 | PyObject *seq, *func, *result = NULL, *it; |
Guido van Rossum | 0919a1a | 2006-08-26 20:49:04 +0000 | [diff] [blame] | 339 | |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 340 | if (!PyArg_UnpackTuple(args, "reduce", 2, 3, &func, &seq, &result)) |
| 341 | return NULL; |
| 342 | if (result != NULL) |
| 343 | Py_INCREF(result); |
Guido van Rossum | 0919a1a | 2006-08-26 20:49:04 +0000 | [diff] [blame] | 344 | |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 345 | it = PyObject_GetIter(seq); |
| 346 | if (it == NULL) { |
Alexander Belopolsky | e29e6bf | 2010-08-16 18:55:46 +0000 | [diff] [blame] | 347 | if (PyErr_ExceptionMatches(PyExc_TypeError)) |
| 348 | PyErr_SetString(PyExc_TypeError, |
| 349 | "reduce() arg 2 must support iteration"); |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 350 | Py_XDECREF(result); |
| 351 | return NULL; |
| 352 | } |
Guido van Rossum | 0919a1a | 2006-08-26 20:49:04 +0000 | [diff] [blame] | 353 | |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 354 | if ((args = PyTuple_New(2)) == NULL) |
| 355 | goto Fail; |
Guido van Rossum | 0919a1a | 2006-08-26 20:49:04 +0000 | [diff] [blame] | 356 | |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 357 | for (;;) { |
| 358 | PyObject *op2; |
Guido van Rossum | 0919a1a | 2006-08-26 20:49:04 +0000 | [diff] [blame] | 359 | |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 360 | if (args->ob_refcnt > 1) { |
| 361 | Py_DECREF(args); |
| 362 | if ((args = PyTuple_New(2)) == NULL) |
| 363 | goto Fail; |
| 364 | } |
Guido van Rossum | 0919a1a | 2006-08-26 20:49:04 +0000 | [diff] [blame] | 365 | |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 366 | op2 = PyIter_Next(it); |
| 367 | if (op2 == NULL) { |
| 368 | if (PyErr_Occurred()) |
| 369 | goto Fail; |
| 370 | break; |
| 371 | } |
Guido van Rossum | 0919a1a | 2006-08-26 20:49:04 +0000 | [diff] [blame] | 372 | |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 373 | if (result == NULL) |
| 374 | result = op2; |
| 375 | else { |
| 376 | PyTuple_SetItem(args, 0, result); |
| 377 | PyTuple_SetItem(args, 1, op2); |
| 378 | if ((result = PyEval_CallObject(func, args)) == NULL) |
| 379 | goto Fail; |
| 380 | } |
| 381 | } |
Guido van Rossum | 0919a1a | 2006-08-26 20:49:04 +0000 | [diff] [blame] | 382 | |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 383 | Py_DECREF(args); |
Guido van Rossum | 0919a1a | 2006-08-26 20:49:04 +0000 | [diff] [blame] | 384 | |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 385 | if (result == NULL) |
| 386 | PyErr_SetString(PyExc_TypeError, |
| 387 | "reduce() of empty sequence with no initial value"); |
Guido van Rossum | 0919a1a | 2006-08-26 20:49:04 +0000 | [diff] [blame] | 388 | |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 389 | Py_DECREF(it); |
| 390 | return result; |
Guido van Rossum | 0919a1a | 2006-08-26 20:49:04 +0000 | [diff] [blame] | 391 | |
| 392 | Fail: |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 393 | Py_XDECREF(args); |
| 394 | Py_XDECREF(result); |
| 395 | Py_DECREF(it); |
| 396 | return NULL; |
Guido van Rossum | 0919a1a | 2006-08-26 20:49:04 +0000 | [diff] [blame] | 397 | } |
| 398 | |
| 399 | PyDoc_STRVAR(functools_reduce_doc, |
| 400 | "reduce(function, sequence[, initial]) -> value\n\ |
| 401 | \n\ |
| 402 | Apply a function of two arguments cumulatively to the items of a sequence,\n\ |
| 403 | from left to right, so as to reduce the sequence to a single value.\n\ |
| 404 | For example, reduce(lambda x, y: x+y, [1, 2, 3, 4, 5]) calculates\n\ |
| 405 | ((((1+2)+3)+4)+5). If initial is present, it is placed before the items\n\ |
| 406 | of the sequence in the calculation, and serves as a default when the\n\ |
| 407 | sequence is empty."); |
| 408 | |
Raymond Hettinger | 9c323f8 | 2005-02-28 19:39:44 +0000 | [diff] [blame] | 409 | /* module level code ********************************************************/ |
| 410 | |
| 411 | PyDoc_STRVAR(module_doc, |
Thomas Wouters | 4d70c3d | 2006-06-08 14:42:34 +0000 | [diff] [blame] | 412 | "Tools that operate on functions."); |
Raymond Hettinger | 9c323f8 | 2005-02-28 19:39:44 +0000 | [diff] [blame] | 413 | |
| 414 | static PyMethodDef module_methods[] = { |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 415 | {"reduce", functools_reduce, METH_VARARGS, functools_reduce_doc}, |
| 416 | {NULL, NULL} /* sentinel */ |
Raymond Hettinger | 9c323f8 | 2005-02-28 19:39:44 +0000 | [diff] [blame] | 417 | }; |
| 418 | |
Martin v. Löwis | 1a21451 | 2008-06-11 05:26:20 +0000 | [diff] [blame] | 419 | |
| 420 | static struct PyModuleDef _functoolsmodule = { |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 421 | PyModuleDef_HEAD_INIT, |
| 422 | "_functools", |
| 423 | module_doc, |
| 424 | -1, |
| 425 | module_methods, |
| 426 | NULL, |
| 427 | NULL, |
| 428 | NULL, |
| 429 | NULL |
Martin v. Löwis | 1a21451 | 2008-06-11 05:26:20 +0000 | [diff] [blame] | 430 | }; |
| 431 | |
Raymond Hettinger | 9c323f8 | 2005-02-28 19:39:44 +0000 | [diff] [blame] | 432 | PyMODINIT_FUNC |
Martin v. Löwis | 1a21451 | 2008-06-11 05:26:20 +0000 | [diff] [blame] | 433 | PyInit__functools(void) |
Raymond Hettinger | 9c323f8 | 2005-02-28 19:39:44 +0000 | [diff] [blame] | 434 | { |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 435 | int i; |
| 436 | PyObject *m; |
| 437 | char *name; |
| 438 | PyTypeObject *typelist[] = { |
| 439 | &partial_type, |
| 440 | NULL |
| 441 | }; |
Raymond Hettinger | 9c323f8 | 2005-02-28 19:39:44 +0000 | [diff] [blame] | 442 | |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 443 | m = PyModule_Create(&_functoolsmodule); |
| 444 | if (m == NULL) |
| 445 | return NULL; |
Raymond Hettinger | 9c323f8 | 2005-02-28 19:39:44 +0000 | [diff] [blame] | 446 | |
Antoine Pitrou | f95a1b3 | 2010-05-09 15:52:27 +0000 | [diff] [blame] | 447 | for (i=0 ; typelist[i] != NULL ; i++) { |
| 448 | if (PyType_Ready(typelist[i]) < 0) { |
| 449 | Py_DECREF(m); |
| 450 | return NULL; |
| 451 | } |
| 452 | name = strchr(typelist[i]->tp_name, '.'); |
| 453 | assert (name != NULL); |
| 454 | Py_INCREF(typelist[i]); |
| 455 | PyModule_AddObject(m, name+1, (PyObject *)typelist[i]); |
| 456 | } |
| 457 | return m; |
Raymond Hettinger | 9c323f8 | 2005-02-28 19:39:44 +0000 | [diff] [blame] | 458 | } |