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Merged bzr.dev r3262.

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bzrlib/tsort.py
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# Copyright (C) 2005, 2006 Canonical Ltd
 
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# Copyright (C) 2005, 2006, 2008 Canonical Ltd
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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from bzrlib import errors
 
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import bzrlib.revision as _mod_revision
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__all__ = ["topo_sort", "TopoSorter", "merge_sort", "MergeSorter"]
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        self._left_subtree_pushed_stack = []
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        # seed the search with the tip of the branch
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        if branch_tip is not None:
 
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        if (branch_tip is not None and
 
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            branch_tip != _mod_revision.NULL_REVISION):
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            parents = self._graph.pop(branch_tip)
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            self._push_node(branch_tip, 0, parents)
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