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bzrlib/revisionspec.py
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    """
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    prefix = None
 
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    wants_revision_history = True
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    def __new__(cls, spec, _internal=False):
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        if _internal:
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    def in_history(self, branch):
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        if branch:
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            revs = branch.revision_history()
 
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            if self.wants_revision_history:
 
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                revs = branch.revision_history()
 
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            else:
 
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                revs = None
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        else:
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            # this should never trigger.
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            # TODO: make it a deprecated code path. RBC 20060928
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                                   your history is very long.
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    """
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    prefix = 'revno:'
 
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    wants_revision_history = False
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    def _match_on(self, branch, revs):
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        """Lookup a revision by revision number"""