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3 � f�& � @ s| d Z ddlmZ ddlmZmZ ddlmZmZ eZ eZ ej Z eZ dZdZdZG dd� de�Zdd d �Zd d � Zdd� Zd S )z0Utility functions used by the btm_matcher module� )�pytree)�grammar�token)�pattern_symbols�python_symbols� � c @ s: e Zd ZdZd dd�Zdd� Zdd� Zd d � Zd d � ZdS )�MinNodez�This class serves as an intermediate representation of the pattern tree during the conversion to sets of leaf-to-root subpatternsNc C s. || _ || _g | _d| _d | _g | _g | _d S )NF)�type�name�children�leaf�parent� alternatives�group)�selfr r � r �6/opt/alt/python36/lib64/python3.6/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 s� | }g }x�|r�|j tkr`|jj|� t|j�t|j�krTt|j�g}g |_|j}q n |j}d}P |j tkr�|j j|� t|j �t|j�kr�t |j �}g |_ |j}q n |j}d}P |j t j kr�|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 s& x | j � D ]}|j� }|r |S q W dS )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 s. x | j D ]}|j� E dH qW | j s*| V dS )z-Generator that returns the leaves of the treeN)r r# )r �childr r r r# ` s zMinNode.leaves)NN) �__name__� __module__� __qualname__�__doc__r r r" r% r# r r r r r s *r Nc C s� d}| j tjkr| jd } | j tjkr�t| j�dkrFt| jd |�}nJttd�}x>| jD ]4}| jj |�d rnqXt||�}|dk rX|jj |� qXW �n| j tj k�rt| j�dkr�tt d�}x(| jD ] }t||�}|r�|jj |� q�W |js�d}nt| jd |�}�n�| j tj k�r�t| jd tj��rH| jd jdk�rHt| jd |�S t| jd tj��rn| jd jdk�s�t| j�dk�r�t| jd d��r�| jd jdk�r�dS d }d}d}d }d} d } xn| jD ]d}|j tjk�r�d }|}n*|j tjk�r�d }|} n|j tjk�r |}t|d��r�|jd k�r�d } �q�W | �rb| jd } t| d��rl| jdk�rl| jd } n | jd } | j tjk�r�| jd k�r�ttd�}n4tt| j��r�ttt| j�d�}nttt| j�d�}n\| j tjk�r | jjd�} | t k�r�tt | d�}nttj| d�}n| j tjk�r$t||�}|�rZ| jd jdk�rBd}n| jd jdk�rVnt �|�r�|dk �r�x8|jdd� D ]&}t||�}|dk �rz|jj |� �qzW |�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 �*�+���) 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| S t| �dkr"| d S g }g }dddddg�g }d� xl| D ]d}tt|d d � ��rFtt|� fd d ���r~|j|� qFtt|�fd d ���r�|j|� qF|j|� qFW |r�|} n|r�|} n|r�|} t| td �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 | �tkS )N)r r )�xr r r �<lambda>� s z/get_characteristic_subpattern.<locals>.<lambda>c s t | t�o| � kS )N)r8 r )rF )� common_charsr r rG s c s t | t�o| � kS )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 s< x6| D ].}t |ttf�r*t||�E dH q||�V qW dS )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 ������)N)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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