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Viewing changes to bzrlib/_static_tuple_py.py

  • Committer: Andrew Bennetts
  • Date: 2009-10-28 00:12:03 UTC
  • mfrom: (4774 +trunk)
  • mto: This revision was merged to the branch mainline in revision 4775.
  • Revision ID: andrew.bennetts@canonical.com-20091028001203-m7lgs1wtnilgo3br
Merge lp:bzr, resolving NEWS conflict.

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bzrlib/_static_tuple_py.py
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class StaticTuple(tuple):
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    """A static type, similar to a tuple of strings."""
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    __slots__ = ()
 
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    def __new__(cls, *args):
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        # Make the empty StaticTuple a singleton
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        if not args and _empty_tuple is not None:
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    def __init__(self, *args):
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        """Create a new 'StaticTuple'"""
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        for bit in args:
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            if type(bit) not in (str, StaticTuple):
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                raise TypeError('key bits must be strings or StaticTuple')
 
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            if type(bit) not in (str, StaticTuple, unicode, int, long, float,
 
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                                 None.__class__, bool):
 
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                raise TypeError('StaticTuple can only point to'
 
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                    ' StaticTuple, str, unicode, int, long, float, bool, or'
 
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                    ' None not %s' % (type(bit),))
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        num_keys = len(args)
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        if num_keys < 0 or num_keys > 255:
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            raise ValueError('must have 1 => 256 key bits')
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    def __repr__(self):
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        return '%s%s' % (self.__class__.__name__, tuple.__repr__(self))
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    def __reduce__(self):
 
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        return (StaticTuple, tuple(self))
 
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    def __add__(self, other):
 
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        """Concatenate self with other"""
 
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        return StaticTuple.from_sequence(tuple.__add__(self,other))
 
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    def as_tuple(self):
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        return self
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    def intern(self):
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        return _interned_tuples.setdefault(self, self)
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    @staticmethod
 
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    def from_sequence(seq):
 
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        """Convert a sequence object into a StaticTuple instance."""
 
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        if isinstance(seq, StaticTuple):
 
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            # it already is
 
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            return seq
 
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        return StaticTuple(*seq)
 
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# Have to set it to None first, so that __new__ can determine whether
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# the _empty_tuple singleton has been created yet or not.