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r wY nX |jr(||jkr(q|j|}|r|j||}|dk r|j| x,|j D ] }|jspg |_|jj| q^W | jj|j }x2|D ]*} | |krg || < || j || qW qW qvW q\W x$t | j| jD ]}|j || qW |j S )a Refactors a parse tree (modifying the tree in place).
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$z RefactoringTool.refactor_treec C s^ |sdS xP|D ]H}xB||j D ]4}|j|}|r |j||}|dk r |j| |}q W qW dS )a Traverse an AST, applying a set of fixers to each node.
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N)r# r r r? )rz rf Z traversalr r4 r r r r r r s
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|S )a Refactors a docstring, looking for doctests.
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since, like most parsers, it is not geared towards preserving
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