Add a class method to RPNExpr for random expr generation

python_rpnexpr.c

@@ -20,6 +20,8 @@
 
 PyMethodDef RPNExpr_methods[] = {
 	{"eval", (PyCFunction)rpnexpr_eval, METH_FASTCALL, "Evaluate an expression"},
+	{"random", (PyCFunction)rpnexpr_random, METH_CLASS | METH_VARARGS | METH_KEYWORDS,
+		"Return a new random RPN expression string"},
 	{"reset_stack", (PyCFunction)rpnexpr_reset_stack, METH_NOARGS,
 		"Reset stack memory storage (set all items to 0)"},
 	{"__getstate__", (PyCFunction)rpnexpr_getstate, METH_NOARGS,
@@ -553,3 +555,31 @@ PyObject* rpnexpr_repr(PyObject *self)
 	return res;
 }
 
+PyObject* rpnexpr_random(PyObject *cls, PyObject *args, PyObject *kwds)
+{
+	long long int args_count, expr_sz;
+	char *expr, err_str[128];
+	PyObject *res;
+	char *names[] = {"args_count", "token_count", NULL};
+
+	expr_sz = 10;
+	if(!PyArg_ParseTupleAndKeywords(args, kwds, "L|L:pyrpn.random_expr", names,
+		&args_count, &expr_sz))
+	{
+		return NULL;
+	}
+	
+	expr = rpn_random(expr_sz, args_count);
+	if(!expr)
+	{
+		snprintf(err_str, 128,
+			"Error generating random expression : %s",
+			strerror(errno));
+		PyErr_SetString(PyExc_RuntimeError, err_str);
+		return NULL;
+	}
+	res = Py_BuildValue("s", expr);
+	//free(expr);
+	return res;
+}
+

python_rpnexpr.h

@@ -154,4 +154,12 @@ PyObject* rpnexpr_repr(PyObject *self);
  */
 PyObject* rpnexpr_str(PyObject *self);
 
+/**@brief Return a new Python str with a random RPN expression
+ * @param mod pyrpn module object
+ * @param args Position arguments in Python list
+ * @param kwds Keywords arguments in Python dict
+ * @ingroup python_module
+ */
+PyObject* rpnexpr_random(PyObject *cls, PyObject *args, PyObject *kwds);
+
 #endif