from __future__ import print_function


class Node(object):
    def __init__(self, tag, value, start_mark, end_mark, comment=None):
        self.tag = tag
        self.value = value
        self.start_mark = start_mark
        self.end_mark = end_mark
        self.comment = comment
        self.anchor = None

    def __repr__(self):
        value = self.value
        # if isinstance(value, list):
        #     if len(value) == 0:
        #         value = '<empty>'
        #     elif len(value) == 1:
        #         value = '<1 item>'
        #     else:
        #         value = '<%d items>' % len(value)
        # else:
        #     if len(value) > 75:
        #         value = repr(value[:70]+u' ... ')
        #     else:
        #         value = repr(value)
        value = repr(value)
        return '%s(tag=%r, value=%s)' % (self.__class__.__name__,
                                         self.tag, value)

    def dump(self, indent=0):
        if isinstance(self.value, basestring):
            print('{}{}(tag={!r}, value={!r})'.format(
                '  ' * indent, self.__class__.__name__, self.tag, self.value))
            if self.comment:
                print('    {}comment: {})'.format(
                    '  ' * indent, self.comment))
            return
        print('{}{}(tag={!r})'.format(
            '  ' * indent, self.__class__.__name__, self.tag))
        if self.comment:
            print('    {}comment: {})'.format(
                '  ' * indent, self.comment))
        for v in self.value:
            if isinstance(v, tuple):
                for v1 in v:
                    v1.dump(indent+1)
            elif isinstance(v, Node):
                v.dump(indent+1)
            else:
                print('Node value type?', type(v))


class ScalarNode(Node):
    """
    styles:
      ? -> set() ? key, no value
      " -> double quoted
      ' -> single quoted
      | -> literal style
      > ->
    """
    id = 'scalar'

    def __init__(self, tag, value, start_mark=None, end_mark=None, style=None,
                 comment=None):
        Node.__init__(self, tag, value, start_mark, end_mark, comment=comment)
        self.style = style


class CollectionNode(Node):
    def __init__(self, tag, value, start_mark=None, end_mark=None,
                 flow_style=None, comment=None, anchor=None):
        Node.__init__(self, tag, value, start_mark, end_mark, comment=comment)
        self.flow_style = flow_style
        self.anchor = anchor


class SequenceNode(CollectionNode):
    id = 'sequence'


class MappingNode(CollectionNode):
    id = 'mapping'