Call a method of the extension.  This is a shortcut for
        :meth:`attr` + :class:`jinja2.nodes.Call`.

def call_method(self, name, args=None, kwargs=None, dyn_args=None,
                    dyn_kwargs=None, lineno=None):
        """Call a method of the extension.  This is a shortcut for
        :meth:`attr` + :class:`jinja2.nodes.Call`.
        """
        if args is None:
            args = []
        if kwargs is None:
            kwargs = []
        return nodes.Call(self.attr(name, lineno=lineno), args, kwargs,
                          dyn_args, dyn_kwargs, lineno=lineno)