a
    IfU                     @   sl   d Z ddlZddlZddlZddlZg dZi Zdd ZdddZddd	Z	dd
dZ
dddZdd ZdS )zCache lines from Python source files.

This is intended to read lines from modules imported -- hence if a filename
is not found, it will look down the module search path for a file by
that name.
    N)getline
clearcache
checkcache	lazycachec                   C   s   t   dS )zClear the cache entirely.N)cacheclear r   r   lib/python3.9/linecache.pyr      s    r   c                 C   s6   t | |}d|  kr"t|kr2n n||d  S dS )z~Get a line for a Python source file from the cache.
    Update the cache if it doesn't contain an entry for this file already.    )getlineslen)filenamelinenomodule_globalslinesr   r   r	   r      s    
r   c                 C   sV   | t v r(t |  }t|dkr(t |  d S zt| |W S  tyP   t  g  Y S 0 dS )zGet the lines for a Python source file from the cache.
    Update the cache if it doesn't contain an entry for this file already.r
      N)r   r   updatecacheMemoryErrorr   )r   r   entryr   r   r	   r   $   s    r   c              	   C   s   | du rt t }n| tv r&| g}ndS |D ]} t|  }t|dkrHq.|\}}}}|du r^q.zt|}W n" ty   t| d Y q.Y n0 ||jks||j	kr.t| d q.dS )zUDiscard cache entries that are out of date.
    (This is not checked upon each call!)Nr
   )
listr   keysr   osstatOSErrorpopst_sizest_mtime)r   	filenamesr   sizemtimer   fullnamer   r   r   r	   r   4   s&    
r   c                 C   s  | t v r$tt |  dkr$t | d | r<| dr@| dr@g S | }zt|}W n tyf   | }t| |rzt |  d  }W n t	tfy   Y nD0 |du rg  Y S t|ddd |
 D |ft | < t |  d  Y S tj| rg  Y S tjD ]`}ztj||}W n ttfy*   Y qY n0 zt|}W  qbW q tyV   Y q0 qg  Y S Y n0 z8t|}| }W d   n1 s0    Y  W n ty   g  Y S 0 |r|d	 d
s|d	  d
7  < |j|j }	}
|	|
||ft | < |S )zUpdate a cache entry and return its list of lines.
    If something's wrong, print a message, discard the cache entry,
    and return an empty list.r
   N<>r   c                 S   s   g | ]}|d  qS )
r   ).0liner   r   r	   
<listcomp>p       zupdatecache.<locals>.<listcomp>r   r$   )r   r   r   
startswithendswithr   r   r   r   ImportError
splitlinespathisabssysjoin	TypeErrorAttributeErrortokenizeopen	readlinesr   r   )r   r   r!   r   basenamedatadirnamefpr   r   r    r   r   r	   r   P   s\    



,
r   c                 C   s   | t v r tt |  dkrdS dS | r8| dr<| dr<dS |rd|v r|d}|d }t|dd	}|r|rt||}|ft | < dS dS )
a  Seed the cache for filename with module_globals.

    The module loader will be asked for the source only when getlines is
    called, not immediately.

    If there is an entry in the cache already, it is not altered.

    :return: True if a lazy load is registered in the cache,
        otherwise False. To register such a load a module loader with a
        get_source method must be found, the filename must be a cacheable
        filename, and the filename must not be already cached.
    r
   TFr"   r#   
__loader____name__
get_sourceN)r   r   r*   r+   getgetattr	functoolspartial)r   r   nameloaderr=   	get_linesr   r   r	   r      s    

r   )N)N)N)N)__doc__r@   r0   r   r4   __all__r   r   r   r   r   r   r   r   r   r   r	   <module>   s   




C