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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
pattern tree during the conversion to sets of leaf-to-root
subpatternsc C sC | | _ | | _ g | _ t | _ d | _ g | _ g | _ d S( N( t typet namet childrent Falset leaft Nonet parentt alternativest group( t selfR R ( ( s) /usr/lib64/python2.7/lib2to3/btm_utils.pyt __init__ s c C s t | j � d t | j � S( Nt ( t strR R ( R ( ( s) /usr/lib64/python2.7/lib2to3/btm_utils.pyt __repr__ s c C sU | } g } xB| rP| j t k r� | j j | � t | j � t | j � k r| t | j � g } g | _ | j } q q� | j } d } Pn | j t k r| j
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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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TYPE_GROUPR t get_characteristic_subpatternt token_labelst NAMER ( R t nodet subp( ( s) /usr/lib64/python2.7/lib2to3/btm_utils.pyt leaf_to_root! s8
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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.
N( t leavesR ( R t lR ( ( s) /usr/lib64/python2.7/lib2to3/btm_utils.pyt get_linear_subpatternK s c c sE x- | j D]" } x | j � D] } | Vq Wq
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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
i i t int fort ift notR s []().,:c S s t | � t k S( N( R R ( R# ( ( s) /usr/lib64/python2.7/lib2to3/btm_utils.pyt <lambda>� s c s t | t � o | � k S( N( R6 R ( R# ( t common_chars( s) /usr/lib64/python2.7/lib2to3/btm_utils.pyRO s c s t | t � o | � k S( N( R6 R ( R# ( t common_names( s) /usr/lib64/python2.7/lib2to3/btm_utils.pyRO s t key( R6 t listR R+ t rec_testR t max( t subpatternst subpatterns_with_namest subpatterns_with_common_namest subpatterns_with_common_charst
subpattern( ( RP RQ s) /usr/lib64/python2.7/lib2to3/btm_utils.pyR � s2
c c sW xP | D]H } t | t t f � rD x* t | | � D] } | Vq2 Wq | | � Vq Wd S( sP Tests test_func on all items of sequence and items of included
sub-iterablesN( R6 RS R RT ( t sequencet test_funcR# t y( ( s) /usr/lib64/python2.7/lib2to3/btm_utils.pyRT s
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