class Node(object):
    def __init__(self, tag, value, start_mark, end_mark):
        self.tag = tag
        self.value = value
        self.start_mark = start_mark
        self.end_mark = end_mark

    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)


class ScalarNode(Node):
    id = "scalar"

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


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


class SequenceNode(CollectionNode):
    id = "sequence"


class MappingNode(CollectionNode):
    id = "mapping"