o
    ,]:                     @   s~   d Z ddlmZ ddlmZ ddlmZmZmZm	Z	m
Z
mZmZmZmZmZ ddlmZmZmZ dd ZG dd	 d	ejZd
S )zD
Fixer for:
(a,)* *b (,c)* [,] = s
for (a,)* *b (,c)* [,] in d: ...
    )
fixer_base)count)
AssignCommaCallNewlineNameNumbertokensymsNodeLeaf)indentationsuitify	commatizec                 C   s  g }t | }t |}| dkrCttjt|ttjttjdttj	ttj
dt|gttjdgg}|| |ttjddd ttjttjdddt|ttjttjdttj	| dkrct|ntdd	ttj
d|dkr~ttjttjd
t|gntdd	gttjdttjdgg}|| |dkr|ttjddd ttjt|ddttjttjdttj	ttjttjd
t|gttj
dgttjdgg}	||	 ttj|}
|
S )z
    Accepts num_pre and num_post, which are counts of values
    before and after the starg (not including the starg)
    Returns a source fit for Assign() from fixer_util
    r   [:]+ prefix    -)unicoder   r   powerr   trailerr   r
   LSQB	subscriptCOLONr	   RSQBappendPLUSfactorMINUS
arith_expr)num_prenum_postLISTNAMEITERNAMEchildrenprepostpre_part	main_part	post_partsource r2   C/usr/lib/python3/dist-packages/libpasteurize/fixes/fix_unpacking.pyassignment_source   s   J

b
r4   c                   @   s(   e Zd ZdZdd Zdd Zdd ZdS )	FixUnpackinga9  
    expl=expr_stmt< testlist_star_expr<
        pre=(any ',')*
            star_expr< '*' name=NAME >
        post=(',' any)* [','] > '=' source=any > |
    impl=for_stmt< 'for' lst=exprlist<
        pre=(any ',')*
            star_expr< '*' name=NAME >
        post=(',' any)* [','] > 'in' it=any ':' suite=any>c           
         s    fdddD \}}}}dd |D }d|_ dd |D }dd t|| g | D }|t  d	|_ tt| jttd
| g}t|t	t
|t
|| j| j}	||	fS )Nc                 3       | ]}  |V  qd S Nget.0nresultsr2   r3   	<genexpr>3       z4FixUnpacking.fix_explicit_context.<locals>.<genexpr>)r,   namer-   r1   c                 S       g | ]}|j tjkr| qS r2   typer
   NAMEcloner:   r2   r2   r3   
<listcomp>4        z5FixUnpacking.fix_explicit_context.<locals>.<listcomp>r   c                 S   rB   r2   rC   r:   r2   r2   r3   rG   6   rH   c                 S      g | ]}|  qS r2   rF   r:   r2   r2   r3   rG   7       r   list)r   r   rF   r"   r   r   r   r)   r   r4   lenr*   )
selfnoder>   r,   rA   r-   r1   target
setup_line
power_liner2   r=   r3   fix_explicit_context2   s      z!FixUnpacking.fix_explicit_contextc                    s    fdddD \}}}}dd |D }d|_ dd |D }dd t|| g | D }|t  | }d	|_ tt| jttd
t| j	g}	t|t
t|t|| j| j	}
|	|
fS )z_
        Only example of the implicit context is
        a for loop, so only fix that.
        c                 3   r6   r7   r8   r:   r=   r2   r3   r?   E   r@   z4FixUnpacking.fix_implicit_context.<locals>.<genexpr>)r,   rA   r-   itc                 S   rB   r2   rC   r:   r2   r2   r3   rG   F   rH   z5FixUnpacking.fix_implicit_context.<locals>.<listcomp>r   c                 S   rB   r2   rC   r:   r2   r2   r3   rG   H   rH   c                 S   rI   r2   rJ   r:   r2   r2   r3   rG   I   rK   r   rL   )r   r   rF   r"   r   r   r   r)   r   r*   r4   rM   )rN   rO   r>   r,   rA   r-   rT   rP   r1   rQ   rR   r2   r=   r3   fix_implicit_context@   s    " z!FixUnpacking.fix_implicit_contextc           
      C   sD  |  d| _|  d| _|d|d}}|durH| ||\}}|j|_t|j|_|t	  |j}|
 }||| ||| dS |dur| ||\}}t| dd |jD d }	d	|_|	jd
 j|_t|	jd |	jd _|	dt	  |	d| |	dt	  |	d| |dt| jdd dS dS )a  
        a,b,c,d,e,f,*g,h,i = range(100) changes to
        _3to2list = list(range(100))
        a,b,c,d,e,f,g,h,i, = _3to2list[:6] + [_3to2list[6:-2]] + _3to2list[-2:]

        and

        for a,b,*c,d,e in iter_of_iters: do_stuff changes to
        for _3to2iter in iter_of_iters:
            _3to2list = list(_3to2iter)
            a,b,c,d,e, = _3to2list[:2] + [_3to2list[2:-2]] + _3to2list[-2:]
            do_stuff
        	_3to2list	_3to2iterexplimplNc                 S   s   g | ]
}|j tjkr|qS r2   )rD   r   suite)r;   kr2   r2   r3   rG   p   s    z*FixUnpacking.transform.<locals>.<listcomp>r   r   r      lstr   r   )new_namer)   r*   r9   rS   r   r   parentappend_childr   removeinsert_childrU   r   r+   valuereplacer   )
rN   rO   r>   rX   rY   rQ   rR   r_   irZ   r2   r2   r3   	transformS   s2   zFixUnpacking.transformN)__name__
__module____qualname__PATTERNrS   rU   rf   r2   r2   r2   r3   r5   &   s
    
r5   N)__doc__lib2to3r   	itertoolsr   lib2to3.fixer_utilr   r   r   r   r   r	   r
   r   r   r   libfuturize.fixer_utilr   r   r   r4   BaseFixr5   r2   r2   r2   r3   <module>   s    0