B
    Æ S]0k  ã               @   s  d Z dZddlZddlZddlZddlZddlZddlZddlm	Z	 ddl
mZmZmZ ddlmZ ddlmZmZ dd	lmZ d!dd„ZG dd„ deƒZdd„ Zdd„ Zdd„ Zdd„ Zdd„ ZG dd„ deƒZG dd„ deƒZG dd„ deƒZ G dd „ d eƒZ!dS )"zÛRefactoring framework.

Used as a main program, this can refactor any number of files and/or
recursively descend down directories.  Imported as a module, this
provides infrastructure to write your own refactoring tool.
z#Guido van Rossum <guido@python.org>é    N)Úchainé   )ÚdriverÚtokenizeÚtoken)Ú	find_root)ÚpytreeÚpygram)Úbtm_matcherTc             C   st   t | g g dgƒ}tj |j¡}g }xLtt |¡ƒD ]:}| d¡r2| d¡r2|rZ|dd… }| 	|dd… ¡ q2W |S )zEReturn a sorted list of all available fix names in the given package.Ú*Úfix_z.pyé   Néýÿÿÿ)
Ú
__import__ÚosÚpathÚdirnameÚ__file__ÚsortedÚlistdirÚ
startswithÚendswithÚappend)Z	fixer_pkgZremove_prefixÚpkgZ	fixer_dirZ	fix_namesÚname© r   ú!lib/python3.7/lib2to3/refactor.pyÚget_all_fix_names   s    r   c               @   s   e Zd ZdS )Ú
_EveryNodeN)Ú__name__Ú
__module__Ú__qualname__r   r   r   r   r   +   s   r   c             C   sš   t | tjtjfƒr(| jdkr t‚| jhS t | tjƒrH| jrDt| jƒS t‚t | tj	ƒrŠt
ƒ }x*| jD ] }x|D ]}| t|ƒ¡ qlW qbW |S td|  ƒ‚dS )zf Accepts a pytree Pattern Node and returns a set
        of the pattern types which will match first. Nz$Oh no! I don't understand pattern %s)Ú
isinstancer   ZNodePatternZLeafPatternÚtyper   ZNegatedPatternZcontentÚ_get_head_typesZWildcardPatternÚsetÚupdateÚ	Exception)ZpatÚrÚpÚxr   r   r   r$   /   s    


r$   c          	   C   sÊ   t  t¡}g }x„| D ]|}|jrjyt|jƒ}W n tk
rJ   | |¡ Y qX xB|D ]}||  |¡ qRW q|jdk	r†||j  |¡ q| |¡ qW x,tt	j
j ¡ t	j
jƒD ]}||  |¡ q¬W t|ƒS )z^ Accepts a list of fixers and returns a dictionary
        of head node type --> fixer list.  N)ÚcollectionsÚdefaultdictÚlistÚpatternr$   r   r   Z_accept_typer   r	   Úpython_grammarZsymbol2numberÚvaluesÚtokensÚextendÚdict)Z
fixer_listZ
head_nodesZeveryÚfixerZheadsZ	node_typer   r   r   Ú_get_headnode_dictK   s"    



r5   c                s   ‡ fdd„t ˆ dƒD ƒS )zN
    Return the fully qualified names for fixers in the package pkg_name.
    c                s   g | ]}ˆ d  | ‘qS )Ú.r   )Ú.0Úfix_name)Úpkg_namer   r   ú
<listcomp>h   s   z+get_fixers_from_package.<locals>.<listcomp>F)r   )r9   r   )r9   r   Úget_fixers_from_packaged   s    
r;   c             C   s   | S )Nr   )Úobjr   r   r   Ú	_identityk   s    r=   c                sV  d}t  t | ¡j¡‰ ‡ fdd„}ttjt jtj	hƒ}t
ƒ }yúxô|ƒ \}}||krVq@q@|tjkrl|rfP d}q@|tjkr.|dkr.|ƒ \}}|tjksž|dkr P |ƒ \}}|tjks¼|dkr¾P |ƒ \}}|tjkrä|dkrä|ƒ \}}xJ|tjkr*| |¡ |ƒ \}}|tjks|d	krP |ƒ \}}qæW q@P q@W W n tk
rL   Y nX t|ƒS )
NFc                 s   t ˆ ƒ} | d | d fS )Nr   r   )Únext)Útok)Úgenr   r   Úadvancer   s    z(_detect_future_features.<locals>.advanceTÚfromZ
__future__Úimportú(ú,)r   Úgenerate_tokensÚioÚStringIOÚreadlineÚ	frozensetr   ÚNEWLINEÚNLÚCOMMENTr%   ÚSTRINGÚNAMEÚOPÚaddÚStopIteration)ÚsourceZhave_docstringrA   ÚignoreÚfeaturesÚtpÚvaluer   )r@   r   Ú_detect_future_featureso   sD    








rX   c               @   s   e Zd ZdZdS )Ú
FixerErrorzA fixer could not be loaded.N)r   r    r!   Ú__doc__r   r   r   r   rY   —   s   rY   c               @   sä   e Zd ZdddœZdZdZd4dd„Zdd	„ Zd
d„ Zdd„ Z	dd„ Z
dd„ Zd5dd„Zd6dd„Zdd„ Zd7dd„Zdd„ Zd8dd„Zdd„ Zd d!„ Zd9d"d#„Zd:d$d%„Zd&Zd'Zd(d)„ Zd*d+„ Zd,d-„ Zd.d/„ Zd0d1„ Zd2d3„ ZdS );ÚRefactoringToolF)Úprint_functionÚwrite_unchanged_filesZFixr   Nc             C   s2  || _ |pg | _| j ¡ | _|dk	r0| j |¡ | jd rDtj| _ntj	| _| j 
d¡| _g | _t d¡| _g | _d| _tj| jtj| jd| _|  ¡ \| _| _g | _t ¡ | _g | _g | _xXt| j| jƒD ]F}|j rä| j !|¡ qÌ|| jkrü| j "|¡ qÌ|| jkrÌ| j "|¡ qÌW t#| jƒ| _$t#| jƒ| _%dS )zÑInitializer.

        Args:
            fixer_names: a list of fixers to import
            options: a dict with configuration.
            explicit: a list of fixers to run even if they are explicit.
        Nr\   r]   r[   F)ÚconvertÚlogger)&ÚfixersÚexplicitÚ_default_optionsÚcopyÚoptionsr&   r	   Ú!python_grammar_no_print_statementÚgrammarr/   Úgetr]   ÚerrorsÚloggingZ	getLoggerr_   Ú	fixer_logÚwroter   ZDriverr   r^   Ú
get_fixersÚ	pre_orderÚ
post_orderÚfilesÚbmZBottomMatcherÚBMZbmi_pre_orderZbmi_post_orderr   ZBM_compatibleZ	add_fixerr   r5   Úbmi_pre_order_headsÚbmi_post_order_heads)ÚselfZfixer_namesrd   ra   r4   r   r   r   Ú__init__£   s<    





zRefactoringTool.__init__c          	   C   s^  g }g }x(| j D ]}t|i i dgƒ}| dd¡d }| | j¡rV|t| jƒd… }| d¡}| jd dd	„ |D ƒ¡ }yt	||ƒ}W n& t
k
r®   td
||f ƒd‚Y nX || j| jƒ}	|	jræ| jdk	ræ|| jkræ|  d|¡ q|  d|¡ |	jdkr
| |	¡ q|	jdkr"| |	¡ qtd|	j ƒ‚qW t d¡}
|j|
d |j|
d ||fS )a  Inspects the options to load the requested patterns and handlers.

        Returns:
          (pre_order, post_order), where pre_order is the list of fixers that
          want a pre-order AST traversal, and post_order is the list that want
          post-order traversal.
        r   r6   r   éÿÿÿÿNÚ_Ú c             S   s   g | ]}|  ¡ ‘qS r   )Útitle)r7   r)   r   r   r   r:   ç   s    z.RefactoringTool.get_fixers.<locals>.<listcomp>zCan't find %s.%sTzSkipping optional fixer: %szAdding transformation: %sZpreZpostzIllegal fixer order: %rZ	run_order)Úkey)r`   r   Úrsplitr   ÚFILE_PREFIXÚlenÚsplitÚCLASS_PREFIXÚjoinÚgetattrÚAttributeErrorrY   rd   rj   ra   Úlog_messageÚ	log_debugÚorderr   ÚoperatorÚ
attrgetterÚsort)rt   Zpre_order_fixersZpost_order_fixersZfix_mod_pathÚmodr8   ÚpartsÚ
class_nameZ	fix_classr4   Zkey_funcr   r   r   rl   ×   s8    


zRefactoringTool.get_fixersc              O   s   ‚ dS )zCalled when an error occurs.Nr   )rt   ÚmsgÚargsÚkwdsr   r   r   Ú	log_errorÿ   s    zRefactoringTool.log_errorc             G   s   |r|| }| j  |¡ dS )zHook to log a message.N)r_   Úinfo)rt   rŒ   r   r   r   r   rƒ     s    zRefactoringTool.log_messagec             G   s   |r|| }| j  |¡ d S )N)r_   Údebug)rt   rŒ   r   r   r   r   r„   	  s    zRefactoringTool.log_debugc             C   s   dS )zTCalled with the old version, new version, and filename of a
        refactored file.Nr   )rt   Úold_textÚnew_textÚfilenameÚequalr   r   r   Úprint_output  s    zRefactoringTool.print_outputc             C   s<   x6|D ].}t j |¡r&|  |||¡ q|  |||¡ qW dS )z)Refactor a list of files and directories.N)r   r   ÚisdirÚrefactor_dirÚrefactor_file)rt   ÚitemsÚwriteÚdoctests_onlyZdir_or_filer   r   r   Úrefactor  s    
zRefactoringTool.refactorc       
      C   s¢   t jd }x’t  |¡D ]„\}}}|  d|¡ | ¡  | ¡  xF|D ]>}| d¡sBt j |¡d |krBt j ||¡}	|  	|	||¡ qBW dd„ |D ƒ|dd…< qW dS )zÄDescends down a directory and refactor every Python file found.

        Python files are assumed to have a .py extension.

        Files and subdirectories starting with '.' are skipped.
        ÚpyzDescending into %sr6   r   c             S   s   g | ]}|  d ¡s|‘qS )r6   )r   )r7   Zdnr   r   r   r:   .  s    z0RefactoringTool.refactor_dir.<locals>.<listcomp>N)
r   ÚextsepÚwalkr„   rˆ   r   r   Úsplitextr€   r™   )
rt   Zdir_namer›   rœ   Zpy_extÚdirpathZdirnamesÚ	filenamesr   Úfullnamer   r   r   r˜     s    


zRefactoringTool.refactor_dirc          
   C   sŠ   yt |dƒ}W n0 tk
r> } z|  d||¡ dS d}~X Y nX zt |j¡d }W d| ¡  X tj |d|dd}| ¡ |fS Q R X dS )	zG
        Do our best to decode a Python source file correctly.
        ÚrbzCan't open %s: %s)NNNr   r(   rx   )ÚencodingÚnewline)	ÚopenÚOSErrorr   r   Údetect_encodingrI   ÚcloserG   Úread)rt   r”   ÚfÚerrr¦   r   r   r   Ú_read_python_source0  s    
z#RefactoringTool._read_python_sourcec             C   sº   |   |¡\}}|dkrdS |d7 }|rn|  d|¡ |  ||¡}| jsL||kr`|  |||||¡ q¶|  d|¡ nH|  ||¡}| jsŠ|rª|jrª| jt|ƒdd… |||d n|  d|¡ dS )zRefactors a file.NÚ
zRefactoring doctests in %szNo doctest changes in %srv   )r›   r¦   zNo changes in %s)r¯   r„   Úrefactor_docstringr]   Úprocessed_fileÚrefactor_stringÚwas_changedÚstr)rt   r”   r›   rœ   Úinputr¦   ÚoutputÚtreer   r   r   r™   @  s    zRefactoringTool.refactor_filec          
   C   s–   t |ƒ}d|krtj| j_zLy| j |¡}W n6 tk
rb } z|  d||jj	|¡ dS d}~X Y nX W d| j| j_X ||_
|  d|¡ |  ||¡ |S )aF  Refactor a given input string.

        Args:
            data: a string holding the code to be refactored.
            name: a human-readable name for use in error/log messages.

        Returns:
            An AST corresponding to the refactored input stream; None if
            there were errors during the parse.
        r\   zCan't parse %s: %s: %sNzRefactoring %s)rX   r	   re   r   rf   Zparse_stringr'   r   Ú	__class__r   Úfuture_featuresr„   Úrefactor_tree)rt   Údatar   rU   r¸   r®   r   r   r   r³   W  s    
zRefactoringTool.refactor_stringc             C   sŒ   t j ¡ }|rN|  d¡ |  |d¡}| js2||krB|  |d|¡ qˆ|  d¡ n:|  |d¡}| jsj|r~|jr~|  t	|ƒd|¡ n
|  d¡ d S )NzRefactoring doctests in stdinz<stdin>zNo doctest changes in stdinzNo changes in stdin)
ÚsysÚstdinr¬   r„   r±   r]   r²   r³   r´   rµ   )rt   rœ   r¶   r·   r¸   r   r   r   Úrefactor_stdinr  s    

zRefactoringTool.refactor_stdinc       
   
   C   sü  x"t | j| jƒD ]}| ||¡ qW |  | j| ¡ ¡ |  | j| ¡ ¡ | j | 	¡ ¡}xtt
| ¡ ƒrÎx^| jjD ]P}||krv|| rv|| jtjjdd |jr¼|| jtjjd xt|| ƒD ]ø}||| krê||  |¡ yt|ƒ W n tk
r   wÌY nX |jr&||jkr&qÌ| |¡}|rÌ| ||¡}|dk	rÌ| |¡ x,| ¡ D ] }|jsng |_|j |¡ q\W | j | 	¡ ¡}x2|D ]*}	|	|kr¬g ||	< ||	  ||	 ¡ q–W qÌW qvW q\W x$t | j| jƒD ]}| ||¡ qàW |jS )aÏ  Refactors a parse tree (modifying the tree in place).

        For compatible patterns the bottom matcher module is
        used. Otherwise the tree is traversed node-to-node for
        matches.

        Args:
            tree: a pytree.Node instance representing the root of the tree
                  to be refactored.
            name: a human-readable name for this tree.

        Returns:
            True if the tree was modified, False otherwise.
        T)rz   Úreverse)rz   N)r   rm   rn   Z
start_treeÚtraverse_byrr   rs   rq   ÚrunZleavesÚanyr0   r`   rˆ   r   ZBaseZdepthZkeep_line_orderZ
get_linenor-   Úremover   Ú
ValueErrorZfixers_appliedÚmatchÚ	transformÚreplacer   r2   Zfinish_treer´   )
rt   r¸   r   r4   Z	match_setÚnodeÚresultsÚnewZnew_matchesZfxrr   r   r   r»   ‚  sJ    



$zRefactoringTool.refactor_treec             C   s^   |sdS xP|D ]H}xB||j  D ]4}| |¡}|r| ||¡}|dk	r| |¡ |}qW qW dS )a  Traverse an AST, applying a set of fixers to each node.

        This is a helper method for refactor_tree().

        Args:
            fixers: a list of fixer instances.
            traversal: a generator that yields AST nodes.

        Returns:
            None
        N)r#   rÆ   rÇ   rÈ   )rt   r`   Z	traversalrÉ   r4   rÊ   rË   r   r   r   rÁ   Ñ  s    


zRefactoringTool.traverse_byc             C   s†   | j  |¡ |dkr.|  |¡d }|dkr.dS ||k}|  ||||¡ |r`|  d|¡ | js`dS |rv|  ||||¡ n|  d|¡ dS )zR
        Called when a file has been refactored and there may be changes.
        Nr   zNo changes to %szNot writing changes to %s)ro   r   r¯   r–   r„   r]   Ú
write_file)rt   r“   r”   r’   r›   r¦   r•   r   r   r   r²   è  s    zRefactoringTool.processed_filec             C   s®   yt j|d|dd}W n0 tk
rF } z|  d||¡ dS d}~X Y nX |F y| |¡ W n0 tk
rŒ } z|  d||¡ W dd}~X Y nX W dQ R X |  d|¡ d| _dS )	zÑWrites a string to a file.

        It first shows a unified diff between the old text and the new text, and
        then rewrites the file; the latter is only done if the write option is
        set.
        Úwrx   )r¦   r§   zCan't create %s: %sNzCan't write %s: %szWrote changes to %sT)rG   r¨   r©   r   r›   r„   rk   )rt   r“   r”   r’   r¦   Úfpr®   r   r   r   rÌ   ý  s    *zRefactoringTool.write_filez>>> z... c       
   	   C   s  g }d}d}d}d}xØ|j ddD ]È}|d7 }| ¡  | j¡r€|dk	r\| |  ||||¡¡ |}|g}| | j¡}	|d|	… }q"|dk	rº| || j ¡s®||| j ¡  d krº| 	|¡ q"|dk	rØ| |  ||||¡¡ d}d}| 	|¡ q"W |dk	r| |  ||||¡¡ d 
|¡S )aË  Refactors a docstring, looking for doctests.

        This returns a modified version of the input string.  It looks
        for doctests, which start with a ">>>" prompt, and may be
        continued with "..." prompts, as long as the "..." is indented
        the same as the ">>>".

        (Unfortunately we can't use the doctest module's parser,
        since, like most parsers, it is not geared towards preserving
        the original source.)
        Nr   T)Úkeependsr   r°   rx   )Ú
splitlinesÚlstripr   ÚPS1r2   Úrefactor_doctestÚfindÚPS2Úrstripr   r€   )
rt   r¶   r”   ÚresultÚblockZblock_linenoÚindentÚlinenoÚlineÚir   r   r   r±     s:    



z"RefactoringTool.refactor_docstringc       
   
      s*  yˆ  ||ˆ ¡}W nf tk
rx } zHˆj tj¡rRx|D ]}ˆ d| d¡¡ q8W ˆ d|||j	j
|¡ |S d}~X Y nX ˆ ||¡r&t|ƒjdd}|d|d … ||d d…  }	}|	dg|d  ksÔt|	ƒ‚|d  d¡sò|d  d7  < ˆ ˆj | d	¡ g}|r&|‡ ‡fd
d„|D ƒ7 }|S )zÞRefactors one doctest.

        A doctest is given as a block of lines, the first of which starts
        with ">>>" (possibly indented), while the remaining lines start
        with "..." (identically indented).

        z
Source: %sr°   z+Can't parse docstring in %s line %s: %s: %sNT)rÏ   r   rv   r   c                s   g | ]}ˆ ˆj  | ‘qS r   )rÕ   )r7   rÛ   )rÙ   rt   r   r   r:   Z  s    z4RefactoringTool.refactor_doctest.<locals>.<listcomp>)Úparse_blockr'   r_   ZisEnabledForri   ÚDEBUGr„   rÖ   r   r¹   r   r»   rµ   rÐ   ÚAssertionErrorr   rÒ   Úpop)
rt   rØ   rÚ   rÙ   r”   r¸   r®   rÛ   rË   Zclippedr   )rÙ   rt   r   rÓ   @  s&    
"z RefactoringTool.refactor_doctestc             C   sÒ   | j rd}nd}| js$|  d|¡ n&|  d|¡ x| jD ]}|  |¡ q8W | jrt|  d¡ x| jD ]}|  |¡ qbW | jrÎt| jƒdkr”|  d¡ n|  dt| jƒ¡ x&| jD ]\}}}| j|f|ž|Ž q®W d S )	NÚwerez
need to bezNo files %s modified.zFiles that %s modified:z$Warnings/messages while refactoring:r   zThere was 1 error:zThere were %d errors:)rk   ro   rƒ   rj   rh   r}   )rt   rá   ÚfileÚmessagerŒ   r   rŽ   r   r   r   Ú	summarize]  s$    
zRefactoringTool.summarizec             C   s"   | j  |  |||¡¡}tƒ |_|S )z³Parses a block into a tree.

        This is necessary to get correct line number / offset information
        in the parser diagnostics and embedded into the parse tree.
        )r   Zparse_tokensÚ	wrap_toksrJ   rº   )rt   rØ   rÚ   rÙ   r¸   r   r   r   rÝ   t  s    zRefactoringTool.parse_blockc             c   sh   t  |  ||¡j¡}xN|D ]F\}}\}}\}	}
}||d 7 }|	|d 7 }	||||f|	|
f|fV  qW dS )z;Wraps a tokenize stream to systematically modify start/end.r   N)r   rF   Ú	gen_linesÚ__next__)rt   rØ   rÚ   rÙ   r1   r#   rW   Zline0Zcol0Zline1Zcol1Z	line_textr   r   r   rå   ~  s
    zRefactoringTool.wrap_toksc             c   s€   || j  }|| j }|}xV|D ]N}| |¡r@|t|ƒd… V  n(|| ¡ d krXdV  ntd||f ƒ‚|}qW x
dV  qrW dS )z–Generates lines as expected by tokenize from a list of lines.

        This strips the first len(indent + self.PS1) characters off each line.
        Nr°   zline=%r, prefix=%rrx   )rÒ   rÕ   r   r}   rÖ   rß   )rt   rØ   rÙ   Úprefix1Zprefix2ÚprefixrÛ   r   r   r   ræ   Œ  s    



zRefactoringTool.gen_lines)NN)FF)FF)FF)F)NFN)N)r   r    r!   rb   r   r|   ru   rl   r   rƒ   r„   r–   r   r˜   r¯   r™   r³   r¿   r»   rÁ   r²   rÌ   rÒ   rÕ   r±   rÓ   rä   rÝ   rå   ræ   r   r   r   r   r[   ›   s:   
4(
	


O 

+
r[   c               @   s   e Zd ZdS )ÚMultiprocessingUnsupportedN)r   r    r!   r   r   r   r   rê      s   rê   c                   sB   e Zd Z‡ fdd„Zd‡ fdd„	Z‡ fdd„Z‡ fd	d
„Z‡  ZS )ÚMultiprocessRefactoringToolc                s"   t t| ƒj||Ž d | _d | _d S )N)Úsuperrë   ru   ÚqueueÚoutput_lock)rt   r   Úkwargs)r¹   r   r   ru   ¦  s    z$MultiprocessRefactoringTool.__init__Fr   c          
      s  |dkrt tˆƒ |||¡S ydd l‰ W n tk
r@   t‚Y nX ˆjd k	rTtdƒ‚ˆ  ¡ ˆ_ˆ  	¡ ˆ_
‡ ‡fdd„t|ƒD ƒ}z.x|D ]}| ¡  qˆW t tˆƒ |||¡ W d ˆj ¡  xt|ƒD ]}ˆj d ¡ qÄW x|D ]}| ¡ rÞ| ¡  qÞW d ˆ_X d S )Nr   r   z already doing multiple processesc                s   g | ]}ˆ j ˆjd ‘qS ))Útarget)ZProcessÚ_child)r7   rÜ   )Úmultiprocessingrt   r   r   r:   ¸  s   z8MultiprocessRefactoringTool.refactor.<locals>.<listcomp>)rì   rë   r   rò   ÚImportErrorrê   rí   ÚRuntimeErrorZJoinableQueueZLockrî   ÚrangeÚstartr€   ÚputZis_alive)rt   rš   r›   rœ   Znum_processesZ	processesr)   rÜ   )r¹   )rò   rt   r   r   «  s2    









z$MultiprocessRefactoringTool.refactorc                sR   | j  ¡ }xB|d k	rL|\}}ztt| ƒj||Ž W d | j  ¡  X | j  ¡ }qW d S )N)rí   rg   rì   rë   r™   Z	task_done)rt   Ztaskr   rï   )r¹   r   r   rñ   È  s    


z"MultiprocessRefactoringTool._childc                s2   | j d k	r| j  ||f¡ ntt| ƒj||ŽS d S )N)rí   r÷   rì   rë   r™   )rt   r   rï   )r¹   r   r   r™   Ó  s    

z)MultiprocessRefactoringTool.refactor_file)FFr   )r   r    r!   ru   r   rñ   r™   Ú__classcell__r   r   )r¹   r   rë   ¤  s
    rë   )T)"rZ   Ú
__author__rG   r   r½   ri   r†   r+   Ú	itertoolsr   Zpgen2r   r   r   Z
fixer_utilr   rx   r   r	   r
   rp   r   r'   r   r$   r5   r;   r=   rX   rY   Úobjectr[   rê   rë   r   r   r   r   Ú<module>	   s6   
(    	