}
        if (current.isTopLevelNode()) {
            writeNode(current);
        }
        current.state = State.Done;
        current = current.parent;
        prefixer = new DefaultPrefixer();
        return this;
    }

    private void writeNode(Node node) {
        if (node.prefix == null) {
            node.prefix = node.isTopLevelNode() ? "" : node.parent.prefix + "    ";
        }