Function SWIG_Python_UnpackTuple

swig/python/export_wrap.cpp:1308–1352

/* Unpack the argument tuple */

SWIGINTERN int
SWIG_Python_UnpackTuple(PyObject *args, const char *name, Py_ssize_t min, Py_ssize_t max, PyObject **objs)
{
  if (!args) {
    if (!min && !max) {
      return 1;
    } else {
      PyErr_Format(PyExc_TypeError, "%s expected %s%d arguments, got none", 
		   name, (min == max ? "" : "at least "), (int)min);
      return 0;
    }
  }  
  if (!PyTuple_Check(args)) {
    if (min <= 1 && max >= 1) {
      register int i;
      objs[0] = args;
      for (i = 1; i < max; ++i) {
	objs[i] = 0;
      }
      return 2;
    }
    PyErr_SetString(PyExc_SystemError, "UnpackTuple() argument list is not a tuple");
    return 0;
  } else {
    register Py_ssize_t l = PyTuple_GET_SIZE(args);
    if (l < min) {
      PyErr_Format(PyExc_TypeError, "%s expected %s%d arguments, got %d", 
		   name, (min == max ? "" : "at least "), (int)min, (int)l);
      return 0;
    } else if (l > max) {
      PyErr_Format(PyExc_TypeError, "%s expected %s%d arguments, got %d", 
		   name, (min == max ? "" : "at most "), (int)max, (int)l);
      return 0;
    } else {
      register int i;
      for (i = 0; i < l; ++i) {
	objs[i] = PyTuple_GET_ITEM(args, i);
      }
      for (; l < max; ++l) {
	objs[l] = 0;
      }
      return i + 1;
    }    
  }
}

/* A functor is a function object with one single object argument */
#if PY_VERSION_HEX >= 0x02020000