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Make C helper function more closely match the pure python version, and add tests.

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This commit is contained in:
Raymond Hettinger 2011-01-03 02:12:02 +00:00
parent 23eaa70057
commit 426e052a4f
2 changed files with 63 additions and 23 deletions
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71
Modules/_collectionsmodule.c
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@ -1536,41 +1536,68 @@ _count_elements(PyObject *self, PyObject *args)
if (!PyArg_UnpackTuple(args, "_count_elements", 2, 2, &mapping, &iterable))
return NULL;
if (!PyDict_Check(mapping)) {
PyErr_SetString(PyExc_TypeError,
"Expected mapping argument to be a dictionary");
return NULL;
}
it = PyObject_GetIter(iterable);
if (it == NULL)
return NULL;
one = PyLong_FromLong(1);
if (one == NULL) {
Py_DECREF(it);
return NULL;
}
while (1) {
key = PyIter_Next(it);
if (key == NULL) {
if (PyErr_Occurred() && PyErr_ExceptionMatches(PyExc_StopIteration))
PyErr_Clear();
break;
if (PyDict_CheckExact(mapping)) {
while (1) {
key = PyIter_Next(it);
if (key == NULL) {
if (PyErr_Occurred() && PyErr_ExceptionMatches(PyExc_StopIteration))
PyErr_Clear();
else
break;
}
oldval = PyDict_GetItem(mapping, key);
if (oldval == NULL) {
if (PyDict_SetItem(mapping, key, one) == -1)
break;
} else {
newval = PyNumber_Add(oldval, one);
if (newval == NULL)
break;
if (PyDict_SetItem(mapping, key, newval) == -1)
break;
Py_CLEAR(newval);
}
Py_DECREF(key);
}
oldval = PyDict_GetItem(mapping, key);
if (oldval == NULL) {
if (PyDict_SetItem(mapping, key, one) == -1)
break;
} else {
newval = PyNumber_Add(oldval, one);
if (newval == NULL)
break;
if (PyDict_SetItem(mapping, key, newval) == -1)
} else {
while (1) {
key = PyIter_Next(it);
if (key == NULL) {
if (PyErr_Occurred() && PyErr_ExceptionMatches(PyExc_StopIteration))
PyErr_Clear();
else
break;
}
oldval = PyObject_GetItem(mapping, key);
if (oldval == NULL) {
if (!PyErr_Occurred() || !PyErr_ExceptionMatches(PyExc_KeyError))
break;
PyErr_Clear();
Py_INCREF(one);
newval = one;
} else {
newval = PyNumber_Add(oldval, one);
Py_DECREF(oldval);
if (newval == NULL)
break;
}
if (PyObject_SetItem(mapping, key, newval) == -1)
break;
Py_CLEAR(newval);
Py_DECREF(key);
}
Py_DECREF(key);
}
Py_DECREF(it);
Py_XDECREF(key);
Py_XDECREF(newval);