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bzrlib/option.py
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    BzrError: No namespace registered for string: 'abc'
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    >>> _parse_revision_str('branch:../branch2')
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    [<RevisionSpec_branch branch:../branch2>]
 
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    >>> _parse_revision_str('branch:../../branch2')
 
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    [<RevisionSpec_branch branch:../../branch2>]
 
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    >>> _parse_revision_str('branch:../../branch2..23')
 
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    [<RevisionSpec_branch branch:../../branch2>, <RevisionSpec_int 23>]
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    """
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    # TODO: Maybe move this into revisionspec.py
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    old_format_re = re.compile('\d*:\d*')
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            else:
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                revs.append(RevisionSpec(None))
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    else:
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        next_prefix = None
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        for x in revstr.split('..'):
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            if not x:
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                revs.append(RevisionSpec(None))
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            elif x[-1] == ':':
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                # looks like a namespace:.. has happened
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                next_prefix = x + '..'
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            else:
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                if next_prefix is not None:
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                    x = next_prefix + x
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                revs.append(RevisionSpec(x))
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                next_prefix = None
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        if next_prefix is not None:
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            revs.append(RevisionSpec(next_prefix))
 
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        sep = re.compile("\\.\\.(?!/)")
 
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        for x in sep.split(revstr):
 
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            revs.append(RevisionSpec(x or None))
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    return revs
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