# vim: set fileencoding=utf-8 :


class Node(object):
    def __init__(self, value, *nodes):
        self.value, self.nodes = value, list(nodes)
        self.parent = None

        for a in self.nodes:
            a.parent = self

    def __getitem__(self, n):
        return self.nodes[n]

    def __setitem__(self, n, node):
        self.nodes[n] = node

    def __iter__(self):
        return iter(self.nodes)

    def __len__(self):
        return len(self.nodes)

    def title(self):
        return str(self.value)


class Leaf(object):
    def __init__(self, value):
        self.value = value
        self.parent = None

    def __repr__(self):
        return repr(self.value)

    def __str__(self):
        return str(self.value)

    def title(self):
        return str(self.value)