Method parse_pos_only

Tools/clinic/libclinic/parse_args.py:490–611

(self)

        return c.parse_var_keyword()

    def parse_pos_only(self) -> None:
        if self.fastcall:
            # positional-only, but no option groups
            # we only need one call to _PyArg_ParseStack

            self.flags = "METH_FASTCALL"
            self.parser_prototype = PARSER_PROTOTYPE_FASTCALL
            nargs = 'nargs'
            argname_fmt = 'args[%d]'
        else:
            # positional-only, but no option groups
            # we only need one call to PyArg_ParseTuple

            self.flags = "METH_VARARGS"
            self.parser_prototype = PARSER_PROTOTYPE_VARARGS
            if self.limited_capi:
                nargs = 'PyTuple_Size(args)'
                argname_fmt = 'PyTuple_GetItem(args, %d)'
            else:
                nargs = 'PyTuple_GET_SIZE(args)'
                argname_fmt = 'PyTuple_GET_ITEM(args, %d)'

        parser_code = []
        max_args = NO_VARARG if self.varpos else self.max_pos
        if self.limited_capi:
            if nargs != 'nargs':
                nargs_def = f'Py_ssize_t nargs = {nargs};'
                parser_code.append(libclinic.normalize_snippet(nargs_def, indent=4))
                nargs = 'nargs'
            if self.min_pos == max_args:
                pl = '' if self.min_pos == 1 else 's'
                parser_code.append(libclinic.normalize_snippet(f"""
                    if ({nargs} != {self.min_pos}) {{{{
                        PyErr_Format(PyExc_TypeError, "{{name}} expected {self.min_pos} argument{pl}, got %zd", {nargs});
                        goto exit;
                    }}}}
                    """,
                indent=4))
            else:
                if self.min_pos:
                    pl = '' if self.min_pos == 1 else 's'
                    parser_code.append(libclinic.normalize_snippet(f"""
                        if ({nargs} < {self.min_pos}) {{{{
                            PyErr_Format(PyExc_TypeError, "{{name}} expected at least {self.min_pos} argument{pl}, got %zd", {nargs});
                            goto exit;
                        }}}}
                        """,
                        indent=4))
                if max_args != NO_VARARG:
                    pl = '' if max_args == 1 else 's'
                    parser_code.append(libclinic.normalize_snippet(f"""
                        if ({nargs} > {max_args}) {{{{
                            PyErr_Format(PyExc_TypeError, "{{name}} expected at most {max_args} argument{pl}, got %zd", {nargs});
                            goto exit;
                        }}}}
                        """,
                    indent=4))
        elif self.min_pos or max_args != NO_VARARG: