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    jinja2.visitor
    ~~~~~~~~~~~~~~

    This module implements a visitor for the nodes.

    :copyright: (c) 2010 by the Jinja Team.
    :license: BSD.
i����(tNodetNodeVisitorcBs)eZdZd�Zd�Zd�ZRS(sWalks the abstract syntax tree and call visitor functions for every
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    cCs d|jj}t||d�S(s�Return the visitor function for this node or `None` if no visitor
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