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��Yf�& � @ s� d Z d d l m Z d d l m Z m Z d d l m Z m Z e Z e Z e j Z e Z d Z d Z d Z Gd d � d e � Z d d d � Z d d � Z d d � Z d S)z0Utility functions used by the btm_matcher module� )�pytree)�grammar�token)�pattern_symbols�python_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) �MinNodez�This class serves as an intermediate representation of the pattern tree during the conversion to sets of leaf-to-root subpatternsNc C sC | | _ | | _ g | _ d | _ d | _ g | _ g | _ d S)NF)�type�name�children�leaf�parent� alternatives�group)�selfr r � r �6/opt/alt/python35/lib64/python3.5/lib2to3/btm_utils.py�__init__ s zMinNode.__init__c C s t | j � d t | j � S)N� )�strr r )r r r r �__repr__ s zMinNode.__repr__c C sO | } g } x<| rJ| j t k r� | j j | � t | j � t | j � k r| t | j � g } g | _ | j } q n | j } d } P| j t k r | j j | � t | j � t | j � k r� t | j � } g | _ | j } q n | j } d } P| j t j k r.| j r.| j | j � n | j | j � | j } q W| S)z�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 �TYPE_ALTERNATIVESr �append�lenr �tupler � TYPE_GROUPr � get_characteristic_subpattern� token_labels�NAMEr )r �node�subpr r r � leaf_to_root! s8 zMinNode.leaf_to_rootc C s1 x* | j � D] } | j � } | r | Sq 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 s5 x | j D] } | j � Ed Hq W| j s1 | Vd S)z-Generator that returns the leaves of the treeN)r r# )r �childr r r r# ` s zMinNode.leaves) �__name__� __module__� __qualname__�__doc__r r r" r% r# r r r r r s * r Nc C s� d } | j t j k r% | j d } | j t j k r� t | j � d k re t | j d | � } q�t d t � } xa| j D]J } | j j | � d r� q~ t | | � } | d k r~ | j j | � q~ Wn | j t j k rit | j � d k rPt d t � } x6 | j D]+ } t | | � } | r| j j | � qW| j sfd } q�t | j d | � } no| j t j k r�t | j d t j � r�| j d j d k r�t | j d | � St | j d t j � r�| j d j d k s.t | j � d k r2t | j d d � r2| j d j d k r2d Sd } d } d } d } d } d } x� | j D]� } | j t j k r�d } | } n9 | j t j k r�d } | } n | j t j k r�| } t | d � r`| j d k r`d } q`W| r)| j d } t | d � r6| j d k r6| j d } n | j d } | j t j k r�| j d k rit d t � } q9t t | j � r�t d t t | j � � } q9t d t t | j � � } n� | j t j k r| j j d � } | t k r�t d t | � } q9t d t j d | � } n! | j t j k r9t | | � } | r}| j d j d k r^d } n | j d j d k rwn t � | r�| d k r�xF | j d d � D]1 } t | | � } | d k r�| j j | � q�W| r�| | _ | 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_ANY�getattr�pysyms�STRING�strip�tokens�NotImplementedErrorr ) 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 s/ 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 | � qa t t | � f d d � � � r� | j | � qa | j | � qa W| r| } n | r| } n | r | } t | d t �S)z�Picks the most characteristic from a list of linear patterns Current order used is: names > common_names > common_chars r r+ �in�for�if�not�Nonez[]().,: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 | | � Ed 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� %
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