# coding: utf-8
"""
Utilities for internal usage.
"""


class Borg:
    __shared_state = {}

    def __init__(self):
        self.__dict__ = self.__shared_state
    # and whatever else you want in your class -- that's all!

# coding: utf-8
"""
Utilities for internal usage.
"""

from itertools import chain
from collections import OrderedDict, Callable


class Borg:
    __shared_state = {}

    def __init__(self):
        self.__dict__ = self.__shared_state
    # and whatever else you want in your class -- that's all!



class DefaultOrderedDict(OrderedDict):
    """An ordered and default dict."""
    def __init__(self, default_factory=None, *a, **kw):
        if (default_factory is not None and
                not isinstance(default_factory, Callable)):
            raise TypeError('first argument must be callable')
        OrderedDict.__init__(self, *a, **kw)
        self.default_factory = default_factory

    def __getitem__(self, key):
        try:
            return OrderedDict.__getitem__(self, key)
        except KeyError:
            return self.__missing__(key)

    def __missing__(self, key):
        if self.default_factory is None:
            raise KeyError(key)
        self[key] = value = self.default_factory()
        return value

    def __reduce__(self):
        if self.default_factory is None:
            args = tuple()
        else:
            args = self.default_factory,
        return type(self), args, None, None, iter(self.items())

    def copy(self):
        return self.__copy__()

    def __copy__(self):
        return type(self)(self.default_factory, self)

    def __deepcopy__(self, memo):
        import copy
        return type(self)(self.default_factory,
                          copy.deepcopy(self.items()))

    def __repr__(self):
        return 'OrderedDefaultDict(%s, %s)' % (self.default_factory,
                                               OrderedDict.__repr__(self))

add DefaultOrderedDict to _utils