Add PyArg_ParseArray() function #97
Description
Hi,
I propose adding the following functions to parse arguments of functions using the METH_FASTCALL calling convention:
int PyArg_ParseArray(
PyObject *const *args,
Py_ssize_t nargs,
const char *format,
...);
int PyArg_ParseArrayAndKeywords(
PyObject *const *args,
Py_ssize_t nargs,
PyObject *kwnames,
const char *format,
char * const *kwlist,
...);So what do you think of these functions?
Example with positional only arguments (METH_FASTCALL):
static PyObject*
func(PyObject *module, PyObject *const *args, Py_ssize_t nargs)
{
int arg1, arg2;
if (!PyArg_ParseArray(args, nargs, "ii",
&arg1, &arg2)) {
return NULL;
}
...
}Example with keywords (METH_FASTCALL | METH_KEYWORDS):
static PyObject*
func(PyObject *module, PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames)
{
static char *kwlist[] = {"arg1", "arg2", NULL};
int arg1, arg2;
if (!PyArg_ParseArrayAndKeywords(args, nargs, kwnames,
"ii", kwlist,
&arg1, &arg2)) {
return NULL;
}
...
}These functions are similar to PyArg_ParseTuple() and PyArg_ParseTupleAndKeywords() which are used for the METH_VARARGS calling convention, but expect arguments in the METH_FASTCALL format.
Python already has internal functions _PyArg_ParseStack() and _PyArg_ParseStackAndKeywords(). _PyArg_ParseStack() is the same as PyArg_ParseArray(). _PyArg_ParseStackAndKeywords() has the same purpose than PyArg_ParseArrayAndKeywords(), but requires a _PyArg_Parser argument which is non-trivial to initialize and declared as a static function variable.
See also:
UPDATE: Function PyArg_ParseVector() renamed to PyArg_ParseArray().
Victor