B
     S]                 @   sf   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	m
Z
mZmZ dd ZG dd	 d	ejZd
S )a  Fixer for except statements with named exceptions.

The following cases will be converted:

- "except E, T:" where T is a name:

    except E as T:

- "except E, T:" where T is not a name, tuple or list:

        except E as t:
            T = t

    This is done because the target of an "except" clause must be a
    name.

- "except E, T:" where T is a tuple or list literal:

        except E as t:
            T = t.args
   )pytree)token)
fixer_base)AssignAttrNameis_tupleis_listsymsc             c   sH   xBt | D ]6\}}|jtjkr
|jd jdkr
|| |d  fV  q
W d S )N    exceptr   )	enumeratetyper
   except_clausechildrenvalue)Znodesin r   )lib/python3.7/lib2to3/fixes/fix_except.pyfind_excepts   s    r   c               @   s   e Zd ZdZdZdd ZdS )	FixExceptTa1  
    try_stmt< 'try' ':' (simple_stmt | suite)
                  cleanup=(except_clause ':' (simple_stmt | suite))+
                  tail=(['except' ':' (simple_stmt | suite)]
                        ['else' ':' (simple_stmt | suite)]
                        ['finally' ':' (simple_stmt | suite)]) >
    c             C   s  | j }dd |d D }dd |d D }x*t|D ]\}}t|jdkr6|jdd \}}	}
|	tdd	d
 |
jtjkrDt| 	 d	d
}|

 }d|_|
| |
 }|j}x"t|D ]\}}t|tjrP qW t|
st|
rt|t|td}n
t||}x&t|d | D ]}|d| q W ||| q6|
jdkr6d	|
_q6W dd |jd d D | | }t|j|S )Nc             S   s   g | ]}|  qS r   )clone).0r   r   r   r   
<listcomp>2   s    z'FixExcept.transform.<locals>.<listcomp>tailc             S   s   g | ]}|  qS r   )r   )r   Zchr   r   r   r   4   s    Zcleanup      as )prefix argsr   c             S   s   g | ]}|  qS r   )r   )r   cr   r   r   r   \   s       )r
   r   lenr   replacer   r   r   NAMEnew_namer   r    r   
isinstancer   ZNoder   r	   r   r   reversedZinsert_child)selfZnodeZresultsr
   r   Ztry_cleanupr   Ze_suiteEZcommaNZnew_NtargetZsuite_stmtsr   ZstmtZassignZchildr   r   r   r   	transform/   s6    



 zFixExcept.transformN)__name__
__module____qualname__ZBM_compatibleZPATTERNr/   r   r   r   r   r   $   s   r   N)__doc__r!   r   Zpgen2r   r   Z
fixer_utilr   r   r   r   r	   r
   r   ZBaseFixr   r   r   r   r   <module>   s    