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U e5d�& � @ s| d Z ddlmZ ddlmZmZ ddlmZmZ eZ eZ ej Z eZ dZdZdZG dd � d e�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 �)/usr/lib64/python3.8/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 }|r�|j tkr^|j�|� t|j�t|j�krRt|j�g}g |_|j}qn |j}d}q�|j tkr�|j �|� t|j �t|j�kr�t |j �}g |_ |j}qn |j}d}q�|j t j kr�|j r�|�|j � n |�|j � |j}q|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& | � � D ]}|�� }|r| S qdS )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* | j D ]}|�� E dH q| 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 |�}nFttd�}| jD ]4}| j� |�d rlqVt||�}|dk rV|j� |� qV�n| j tj kr�t| j�dkr�tt d�}| jD ] }t||�}|r�|j� |� q�|js�d}nt| jd |�}�n�| j tj k�r�t| jd tj��r>| jd jdk�r>t| jd |�S t| jd tj��rd| jd jdk�s�t| j�dk�r�t| jd d��r�| jd jdk�r�dS d }d}d}d }d} d } | jD ]d}|j tjk�r�d }|}n*|j tjk�r�d }|} n|j tjk�r |}t|d��r�|jd k�r�d } �q�| �rT| jd } t| d��r^| jdk�r^| jd } n | jd } | j tjk�r�| jd k�r�ttd�}n4tt| j��r�ttt| j�d�}nttt| j�d�}n\| j tjk�r�| j�d�} | t k�r�tt | d�}nttj| d�}n| j tjk�rt||�}|�rL| jd jdk�r4d}n| jd jdk�rHnt �|�r�|dk �r�|jdd� D ]&}t||�}|dk �rj|j� |� �qj|�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 �(�[�valueTF�=� �any�')r r �*�+r ) r �symsZMatcherr Z Alternativesr � reduce_treer r �indexr Z Alternativer ZUnit� isinstancer ZLeafr0 �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 r8 g s� �� ��� r8 c s� t | t�s| S t| �dkr"| d S g }g }dddddg�g }d� | D ]d}tt|d d � ��rDtt|� fd d ���r||�|� qDtt|�fd d ���r�|�|� qD|�|� qD|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>� � z/get_characteristic_subpattern.<locals>.<lambda>c s t | t�o| � kS rH �r: r rI )� common_charsr r rK rL c s t | t�o| � kS rH rM rI )� common_namesr r rK rL )�key)r: �listr r3 �rec_testr �max)Z subpatternsZsubpatterns_with_namesZ subpatterns_with_common_namesZ subpatterns_with_common_chars� subpatternr )rN rO r r � s6 � � r c c s8 | D ].}t |ttf�r(t||�E dH q||�V qdS )zPTests test_func on all items of sequence and items of included sub-iterablesN)r: rQ r rR )ZsequenceZ test_funcrJ r r r rR s rR )N)r+ � r Zpgen2r r Zpygramr r r7 r> ZopmaprA r r< r r �objectr r8 r rR r r r r �<module> s W %
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