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S( s0 Utility functions used by the btm_matcher modulei ( t pytree( t grammart token( t pattern_symbolst python_symbolsi����i����i����t MinNodec B sA e Z d Z d d d � Z d � Z d � Z d � Z d � Z RS( s� This class serves as an intermediate representation of the
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k r4| j r4| j | j � n | j | j � | j } q W| S( s� Internal 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 t TYPE_ALTERNATIVESR
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Wd S( s� 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.
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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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s� Picks the most characteristic from a list of linear patterns
Current order used is:
names > common_names > common_chars
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