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Patch by Mozhe Zadka, for __contains__ (overloading 'in'). This adds

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an instance method instance_contains as sq_contains.  It looks for
__contains__ and if not found falls back to previous behaviour.
Done.
This commit is contained in:
Guido van Rossum 2000-02-28 15:03:15 +00:00
parent 46c6b20392
commit ee28c3a5ea
1 changed files with 56 additions and 0 deletions
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56
Objects/classobject.c
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@ -1065,6 +1065,59 @@ instance_ass_slice(inst, i, j, value)
return 0;
}
static int instance_contains(PyInstanceObject *inst, PyObject *member)
{
static PyObject *__contains__;
PyObject *func, *arg, *res;
int ret;
if(__contains__ == NULL) {
__contains__ = PyString_InternFromString("__contains__");
if(__contains__ == NULL)
return -1;
}
func = instance_getattr(inst, __contains__);
if(func == NULL) {
/* fall back to previous behaviour */
int i, cmp_res;
if(!PyErr_ExceptionMatches(PyExc_AttributeError))
return -1;
PyErr_Clear();
for(i=0;;i++) {
PyObject *obj = instance_item(inst, i);
int ret = 0;
if(obj == NULL) {
if(!PyErr_ExceptionMatches(PyExc_IndexError))
return -1;
PyErr_Clear();
return 0;
}
if(PyObject_Cmp(obj, member, &cmp_res) == -1)
ret = -1;
if(cmp_res == 0)
ret = 1;
Py_DECREF(obj);
if(ret)
return ret;
}
}
arg = Py_BuildValue("(O)", member);
if(arg == NULL) {
Py_DECREF(func);
return -1;
}
res = PyEval_CallObject(func, arg);
Py_DECREF(func);
Py_DECREF(arg);
if(res == NULL)
return -1;
ret = PyObject_IsTrue(res);
Py_DECREF(res);
return ret;
}
static PySequenceMethods instance_as_sequence = {
(inquiry)instance_length, /*sq_length*/
0, /*sq_concat*/
@ -1073,6 +1126,7 @@ static PySequenceMethods instance_as_sequence = {
(intintargfunc)instance_slice, /*sq_slice*/
(intobjargproc)instance_ass_item, /*sq_ass_item*/
(intintobjargproc)instance_ass_slice, /*sq_ass_slice*/
(objobjproc)instance_contains, /* sq_contains */
};
static PyObject *
@ -1405,6 +1459,8 @@ PyTypeObject PyInstance_Type = {
0, /*tp_str*/
(getattrofunc)instance_getattr, /*tp_getattro*/
(setattrofunc)instance_setattr, /*tp_setattro*/
0, /* tp_as_buffer */
Py_TPFLAGS_DEFAULT, /*tp_flags */
};