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Z d d Z d S)z0Utility functions used by the btm_matcher module )pytree)grammartoken)pattern_symbolspython_symbols c @ sX e Z d Z d Z d d d d Z d d Z d d Z d d
Z d d Z d S)
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 | j } q W| 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 nodesubpr r r leaf_to_root! s8
zMinNode.leaf_to_rootc C s1 x* | j D] } | j } | r
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Wd S)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! r r r get_linear_subpatternK s z MinNode.get_linear_subpatternc c s8 x | j D] } | j Dd Hq
W| j s4 | Vn d S)z-Generator that returns the leaves of the treeN)r r# )r childr r r r# ` s zMinNode.leaves) __name__
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C s d } | j t j k r( | j d } n | j t j k r t | j d k rh t | j d | } qt d t } x| j D]P } | j j | d r q n t | | } | d k r | j j
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k rt d t } qTt t | j rt d t t | j } qTt d t t | j } n | j t j k r0| j j d } | t k rt d t | } qTt d t j d | } n$ | j t j k rTt | | } n | r| j d j d k ryd } q| j d j d k rqt n | r| d k rxL | j d d D]4 } t | | } | d k r| j j
| qqWqn | r| | _ n | S)z
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*).
N r r
r ([valueTF=r any'r *+) r
symsZMatcherr Z Alternativesr reduce_treer r indexr Z Alternativer ZUnit
isinstancer ZLeafr. hasattrZDetailsZRepeaterr r TYPE_ANYgetattrpysymsSTRINGstriptokensNotImplementedErrorr )
r r Znew_noder& Zreducedr
Z details_nodeZalternatives_nodeZ has_repeaterZ
repeater_nodeZhas_variable_nameZ name_leafr r r r r6 g s
r6 c s5 t | t s | St | d k r- | d Sg } g } d d d d d g g } d x | D] } t t | d d
ra t t | f d d
r | j | q t t | f d d
r | j | q | j | qa qa W| r| } n | r| } n | r%| } n t | d
t 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 | t k S)N)r
r )xr r r <lambda> s z/get_characteristic_subpattern.<locals>.<lambda>c s t | t o | k S)N)r8 r )rF ) common_charsr r rG s c s t | t o | k S)N)r8 r )rF ) common_namesr r rG s key)r8 listr r0 rec_testr max)Z subpatternsZsubpatterns_with_namesZ subpatterns_with_common_namesZ subpatterns_with_common_chars
subpatternr )rH rI r r s2
r c c sJ xC | D]; } t | t t f r7 t | | Dd Hq | | Vq Wd S)zPTests test_func on all items of sequence and items of included
sub-iterablesN)r8 rK r rL )ZsequenceZ test_funcrF r r r rL s
rL r4 )r* r Zpgen2r r Zpygramr r r5 r< Zopmapr? r r: r r objectr r6 r rL r r r r <module> s W %