3
\ � @ sv d Z ddlmZ ddlmZ ddlmZmZmZ dd� Z dd� Z
d d
� Z d d � Z d
d� Z
dd� ZG dd� dej�ZdS )a� Fixer for __metaclass__ = X -> (metaclass=X) methods.
The various forms of classef (inherits nothing, inherits once, inherints
many) don't parse the same in the CST so we look at ALL classes for
a __metaclass__ and if we find one normalize the inherits to all be
an arglist.
For one-liner classes ('class X: pass') there is no indent/dedent so
we normalize those into having a suite.
Moving the __metaclass__ into the classdef can also cause the class
body to be empty so there is some special casing for that as well.
This fixer also tries very hard to keep original indenting and spacing
in all those corner cases.
� )�
fixer_base)�token)�syms�Node�Leafc C sx xr| j D ]h}|jtjkr t|�S |jtjkr|j r|j d }|jtjkr|j r|j d }t|t�r|j dkrdS qW dS )z� we have to check the cls_node without changing it.
There are two possibilities:
1) clsdef => suite => simple_stmt => expr_stmt => Leaf('__meta')
2) clsdef => simple_stmt => expr_stmt => Leaf('__meta')
� �
__metaclass__TF)
�children�typer �suite�
has_metaclass� simple_stmt� expr_stmt�
isinstancer �value)�parent�node� expr_nodeZ left_side� r �3/usr/lib64/python3.6/lib2to3/fixes/fix_metaclass.pyr s
r c C s� x | j D ]}|jtjkrdS qW x,t| j �D ]\}}|jtjkr,P q,W td��ttjg �}x:| j |d d� r�| j |d }|j |j
� � |j � q\W | j |� |}dS )zf one-line classes don't get a suite in the parse tree so we add
one to normalize the tree
NzNo class suite and no ':'!� ) r r
r r � enumerater �COLON�
ValueErrorr � append_child�clone�remove)�cls_noder �ir � move_noder r r �fixup_parse_tree- s
r c
C s� x(t |j�D ]\}}|jtjkr P q W dS |j� ttjg �}ttj |g�}x2|j|d� r~|j| }|j
|j � � |j� qNW | j ||� |jd jd }|jd jd } | j
|_
dS )z� if there is a semi-colon all the parts count as part of the same
simple_stmt. We just want the __metaclass__ part so we move
everything after the semi-colon into its own simple_stmt node
Nr )r r r
r �SEMIr r r r r
r r � insert_child�prefix)
r r Z stmt_nodeZsemi_indr Znew_exprZnew_stmtr Z new_leaf1Z old_leaf1r r r �fixup_simple_stmtG s
r$ c C s* | j r&| j d jtjkr&| j d j� d S )Nr ���r% )r r
r �NEWLINEr )r r r r �remove_trailing_newline_ s r' c c s� x$| j D ]}|jtjkrP qW td��x�tt|j ��D ]t\}}|jtjkr6|j r6|j d }|jtjkr6|j r6|j d }t |t
�r6|j dkr6t |||� t
|� |||fV q6W d S )NzNo class suite!r r )r r
r r r �listr r
r r r r r$ r' )r r r Z simple_noder Z left_noder r r �
find_metasd s
r) c C s� | j ddd� }x |r.|j� }|jtjkrP qW xL|r||j� }t|t�rd|jtjkrd|jr`d|_dS |j |j ddd� � q2W dS )z� If an INDENT is followed by a thing with a prefix then nuke the prefix
Otherwise we get in trouble when removing __metaclass__ at suite start
Nr � r% r% )
r �popr
r �INDENTr r �DEDENTr# �extend)r Zkidsr r r r � fixup_indent{ s r/ c @ s e Zd ZdZdZdd� ZdS )� FixMetaclassTz
classdef<any*>
c C sN t |�s d S t|� d }x"t|�D ]\}}}|}|j� q"W |jd j}t|j�dkr�|jd jtjkrt|jd }n(|jd j � } t
tj| g�}|j d|� n�t|j�dkr�t
tjg �}|j d|� nZt|j�dk�rt
tjg �}|j dt
tjd�� |j d|� |j dt
tjd�� ntd ��|jd jd }
d
|
_|
j} |j�r^|jt
tjd �� d |
_nd
|
_|jd } | jtjk�s�t�d
| jd _d
| jd _|j|� t|� |j�s�|j� t
|d�}
| |
_|j|
� |jt
tjd�� nbt|j�dk�rJ|jd jtjk�rJ|jd jtjk�rJt
|d�}
|j d|
� |j dt
tjd�� d S )Nr � � � � r �)�(zUnexpected class definition� metaclass�,� r* r �pass�
���r% r% r% ) r r r) r r r
�lenr �arglistr r Z set_childr" r r �RPAR�LPARr r r# r �COMMAr �AssertionErrorr/ r& r, r- )�selfr ZresultsZlast_metaclassr r ZstmtZ text_typer> r Zmeta_txtZorig_meta_prefixr Z pass_leafr r r � transform� s`
zFixMetaclass.transformN)�__name__�
__module__� __qualname__Z
BM_compatibleZPATTERNrD r r r r r0 � s r0 N)�__doc__r* r Zpygramr Z
fixer_utilr r r r r r$ r' r) r/ ZBaseFixr0 r r r r �<module> s