Translate a node into some output format.
        :param node: a treebrd node
        :return: a node's translation to some format

def translate(self, node):
        """
        Translate a node into some output format.
        :param node: a treebrd node
        :return: a node's translation to some format
        """
        _translate = self._translate_functions.get(node.operator)
        return _translate(node)