# vim: set fileencoding=utf-8 :
from copy import deepcopy


class Node(object):
    def __init__(self, value, *nodes):
        super(Node, self).__init__()
        self.value, self.nodes = value, list(nodes)
        self.is_leaf = False
        self.negated = 0

    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 __eq__(self, node):
        return isinstance(node, Node) and self.value == node.value \
               and self.nodes == node.nodes

    def __neg__(self):
        copied = deepcopy(self)
        copied.negated += 1

        return copied

    def __str__(self):
        return '<Node value=%s nodes=%s negated=%d>' \
               % (str(self.value), str(self.nodes), self.negated)

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


class Leaf(Node):
    def __init__(self, value):
        super(Leaf, self).__init__(value)
        self.value = value
        self.nodes = None
        self.is_leaf = True

    def __len__(self):
        return len(str(self.value))

    def __repr__(self):
        return repr('-' * self.negated + str(self.value))

    def __str__(self):
        return '<Leaf %s>' % repr(self)