B
     S]f                 @   sn   d Z ddlmZ ddlmZ ddlmZ ddlm	Z	m
Z
mZ dZG dd dejZd	d
 Zdd Zdd ZdS )z.Fixer for it.next() -> next(it), per PEP 3114.   )token)python_symbols)
fixer_base)NameCallfind_bindingz;Calls to builtin next() possibly shadowed by global bindingc                   s0   e Zd ZdZdZdZ fddZdd Z  ZS )FixNextTa  
    power< base=any+ trailer< '.' attr='next' > trailer< '(' ')' > >
    |
    power< head=any+ trailer< '.' attr='next' > not trailer< '(' ')' > >
    |
    classdef< 'class' any+ ':'
              suite< any*
                     funcdef< 'def'
                              name='next'
                              parameters< '(' NAME ')' > any+ >
                     any* > >
    |
    global=global_stmt< 'global' any* 'next' any* >
    Zprec                s>   t t| || td|}|r4| |t d| _nd| _d S )NnextTF)superr   
start_treer   warningbind_warningshadowed_next)selfZtreefilenamen)	__class__ 'lib/python3.7/lib2to3/fixes/fix_next.pyr   $   s    
zFixNext.start_treec             C   s  |st |d}|d}|d}|rz| jrF|td|jd n2dd |D }d|d	 _|ttd
|jd| n|rtd|jd}|| nl|rt|r|d }ddd |D 	 dkr| 
|t d S |td nd|kr| 
|t d| _d S )Nbaseattrname__next__)prefixc             S   s   g | ]}|  qS r   )Zclone).0r   r   r   r   
<listcomp>9   s    z%FixNext.transform.<locals>.<listcomp>     r	   headc             S   s   g | ]}t |qS r   )str)r   r   r   r   r   r   E   s    Z__builtin__globalT)AssertionErrorgetr   replacer   r   r   is_assign_targetjoinstripr   r   )r   nodeZresultsr   r   r   r   r   r   r   r   	transform.   s.    




zFixNext.transform)	__name__
__module____qualname__ZBM_compatibleZPATTERNorderr   r(   __classcell__r   r   )r   r   r      s
   
r   c             C   sF   t | }|d krdS x,|jD ]"}|jtjkr0dS t|| rdS qW dS )NFT)find_assignchildrentyper   EQUAL
is_subtree)r'   ZassignZchildr   r   r   r$   Q   s    
r$   c             C   s4   | j tjkr| S | j tjks&| jd kr*d S t| jS )N)r0   symsZ	expr_stmtZsimple_stmtparentr.   )r'   r   r   r   r.   ]   s
    r.   c                s$   |  krdS t  fdd| jD S )NTc             3   s   | ]}t | V  qd S )N)r2   )r   c)r'   r   r   	<genexpr>g   s    zis_subtree.<locals>.<genexpr>)anyr/   )rootr'   r   )r'   r   r2   d   s    r2   N)__doc__Zpgen2r   Zpygramr   r3   r   r   Z
fixer_utilr   r   r   r   ZBaseFixr   r$   r.   r2   r   r   r   r   <module>   s   @