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� ZdS )a� A bottom-up tree matching algorithm implementation meant to speed
up 2to3's matching process. After the tree patterns are reduced to
their rarest linear path, a linear Aho-Corasick automaton is
created. The linear automaton traverses the linear paths from the
leaves to the root of the AST and returns a set of nodes for further
matching. This reduces significantly the number of candidate nodes.z+George Boutsioukis <[email protected]>� N)�defaultdict� )�pytree)�reduce_treec @ s e Zd ZdZe�� Zdd� ZdS )�BMNodez?Class for a node of the Aho-Corasick automaton used in matchingc C s"