parse dumped node

def _parse_node(graph, text, condition_node_params, leaf_node_params):
    """parse dumped node"""
    match = _NODEPAT.match(text)
    if match is not None:
        node = match.group(1)
        graph.node(node, label=match.group(2), **condition_node_params)
        return node
    match = _LEAFPAT.match(text)
    if match is not None:
        node = match.group(1)
        graph.node(node, label=match.group(2), **leaf_node_params)
        return node
    raise ValueError('Unable to parse node: {0}'.format(text))