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S )z0Utility functions used by the btm_matcher module )pytree)grammartoken)pattern_symbolspython_symbolsc @ s: e Zd ZdZd
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Zd d ZdS )MinNodezThis class serves as an intermediate representation of the
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W |S )zInternal method. Returns a characteristic path of the
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W dS )a Drives the leaf_to_root method. The reason that
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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" r r r get_linear_subpatternK s z MinNode.get_linear_subpatternc c s. x | j D ]}| E dH qW | j s*| V dS )z-Generator that returns the leaves of the treeN)r
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automaton. This also trims off any optional pattern elements(like
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S )zPicks the most characteristic from a list of linear patterns
Current order used is:
names > common_names > common_chars
r r, inforifnotNonez[]().,:c S s t | tkS )N)r r )xr r r z/get_characteristic_subpattern..c s t | to| kS )N)r: r )rH ) common_charsr r rI rJ c s t | to| kS )N)r: r )rH ) common_namesr r rI rJ )key)r: listr r3 rec_testr max)Z subpatternsZsubpatterns_with_namesZ subpatterns_with_common_namesZ subpatterns_with_common_chars
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