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S )z0Utility functions used by the btm_matcher module )pytree)grammartoken)pattern_symbolspython_symbolsc 2 e Zd ZdZddZd Zd Zd Zd ZdS ) MinNodezThis class serves as an intermediate representation of the
pattern tree during the conversion to sets of leaf-to-root
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n| |j |j }|^|S )zInternal method. Returns a characteristic path of the
pattern tree. This method must be run for all leaves until the
linear subpatterns are merged into a singleN)r TYPE_ALTERNATIVESr appendlenr tupler
TYPE_GROUPr get_characteristic_subpattern token_labelsNAMEr )r nodesubps r leaf_to_rootzMinNode.leaf_to_root! sZ ! y ---!((...t())S -?-??? !$"3 4 45D(*D% ;D ;D DyJ&&
!!$'''tz??c$-&8&8888DDD!#DJ ;D ;D DyL ---$)- DI&&&& DI&&&;DC ! D r c h | D ] }| }|r|c S dS )a Drives the leaf_to_root method. The reason that
leaf_to_root must be run multiple times is because we need to
reject 'group' matches; for example the alternative form
(a | b c) creates a group [b c] that needs to be matched. Since
matching multiple linear patterns overcomes the automaton's
capabilities, leaf_to_root merges each group into a single
choice based on 'characteristic'ity,
i.e. (a|b c) -> (a|b) if b more characteristic than c
Returns: The most 'characteristic'(as defined by
get_characteristic_subpattern) path for the compiled pattern
tree.
N)leavesr( )r lr' s r get_linear_subpatternz MinNode.get_linear_subpatternK sJ A>>##D
r c # l K | j D ] }| E d{V | j s| V dS dS )z-Generator that returns the leaves of the treeN)r r* )r childs r r* zMinNode.leaves` s[ ] & &E ||~~ % % % % % % % %} JJJJJ r )NN) __name__
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Internal function. Reduces a compiled pattern tree to an
intermediate representation suitable for feeding the
automaton. This also trims off any optional pattern elements(like
[a], a*).
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| t S ) zPicks the most characteristic from a list of linear patterns
Current order used is:
names > common_names > common_chars
r r5 )inforifnotNonez[]().,:c . t | t u S N)r r )xs r <lambda>z/get_characteristic_subpattern.<locals>.<lambda> s d1ggn r c 6 t | t o| v S rb rG r )rc common_charss r rd z/get_characteristic_subpattern.<locals>.<lambda> s jC&8&8&NQ,=N r c 6 t | t o| v S rb rf )rc common_namess r rd z/get_characteristic_subpattern.<locals>.<lambda> s
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