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편집 파일: contextlib2.cpython-35.pyc
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Gd- d � d e! � Z" Gd. d � d e � Z# d S)0zAcontextlib2 - backports and enhancements to the contextlib module� N)�deque)�wraps�contextmanager�closing� nullcontext�AbstractContextManager�ContextDecorator� ExitStack�redirect_stdout�redirect_stderr�suppress� ContextStack� � � �ABC� __slots__c C sB | | k r d S| j | � x | j D] } t | | � q' W| S)N)�append� __bases__� _classic_mro)�C�result�B� r ��/builddir/build/BUILDROOT/alt-python35-pip-20.2.4-5.el8.x86_64/opt/alt/python35/lib/python3.5/site-packages/pip/_vendor/contextlib2.pyr s r c G s� y | j } Wn' t k r6 t t | g � � } Yn XxJ | D]B } x9 | D]- } | | j k rK | j | d k rw t SPqK Wt Sq> Wd S)NT)�__mro__�AttributeError�tupler �__dict__�NotImplemented)r �methods�mro�methodr r r r �_check_methods$ s r# c @ sI e Z d Z d Z d d � Z e j d d � � Z e d d � � Z d S) r z,An abstract base class for context managers.c C s | S)z0Return `self` upon entering the runtime context.r )�selfr r r � __enter__8 s z AbstractContextManager.__enter__c C s d S)z9Raise any exception triggered within the runtime context.Nr )r$ �exc_type� exc_value� tracebackr r r �__exit__< s z AbstractContextManager.__exit__c C s | t k r t | d d � St S)z<Check whether subclass is considered a subclass of this ABC.r% r) )r r# r )�clsr r r r �__subclasshook__A s z'AbstractContextManager.__subclasshook__N) �__name__� __module__� __qualname__�__doc__r% �abc�abstractmethodr) � classmethodr+ r r r r r 5 s c @ s: e Z d Z d Z d d � Z d d � Z d d � Z d S) r zJA base class or mixin that enables context managers to work as decorators.c C s t j d t � | j � S)a� Returns the context manager used to actually wrap the call to the decorated function. The default implementation just returns *self*. Overriding this method allows otherwise one-shot context managers like _GeneratorContextManager to support use as decorators via implicit recreation. DEPRECATED: refresh_cm was never added to the standard library's ContextDecorator API z2refresh_cm was never added to the standard library)�warnings�warn�DeprecationWarning� _recreate_cm)r$ r r r � refresh_cmL s zContextDecorator.refresh_cmc C s | S)a6 Return a recreated instance of self. Allows an otherwise one-shot context manager like _GeneratorContextManager to support use as a decorator via implicit recreation. This is a private interface just for _GeneratorContextManager. See issue #11647 for details. r )r$ r r r r6 ] s z ContextDecorator._recreate_cmc s% t � � � � f d d � � } | S)Nc s% � j � � � | | � SWd QRXd S)N)r6 )�args�kwds)�funcr$ r r �innerj s z(ContextDecorator.__call__.<locals>.inner)r )r$ r: r; r )r: r$ r �__call__i s !zContextDecorator.__call__N)r, r- r. r/ r7 r6 r< r r r r r I s c @ sF e Z d Z d Z d d � Z d d � Z d d � Z d d � Z d S) �_GeneratorContextManagerz%Helper for @contextmanager decorator.c C si | | | � | _ | | | | _ | _ | _ t | d d � } | d k r\ t | � j } | | _ d S)Nr/ )�genr: r8 r9 �getattr�typer/ )r$ r: r8 r9 �docr r r �__init__t s z!_GeneratorContextManager.__init__c C s | j | j | j | j � S)N)� __class__r: r8 r9 )r$ r r r r6 � s z%_GeneratorContextManager._recreate_cmc C s6 y t | j � SWn t k r1 t d � � Yn Xd S)Nzgenerator didn't yield)�nextr> � StopIteration� RuntimeError)r$ r r r r% � s z"_GeneratorContextManager.__enter__c C s& | d k rE y t | j � Wn t k r5 d SYq"Xt d � � n� | d k rZ | � } y& | j j | | | � t d � � Wn� t k r� } z | | k SWYd d } ~ Xnq t k r} z1 | | k r� d St r� | j | k r� d S� WYd d } ~ Xn! t j � d | k r � Yn Xd S)Nzgenerator didn't stopz#generator didn't stop after throw()F� ) rD r> rE rF �throw�_HAVE_EXCEPTION_CHAINING� __cause__�sys�exc_info)r$ r@ �valuer( �excr r r r) � s, z!_GeneratorContextManager.__exit__N)r, r- r. r/ rB r6 r% r) r r r r r= q s r= c s" t � � � f d d � � } | S)a� @contextmanager decorator. Typical usage: @contextmanager def some_generator(<arguments>): <setup> try: yield <value> finally: <cleanup> This makes this: with some_generator(<arguments>) as <variable>: <body> equivalent to this: <setup> try: <variable> = <value> <body> finally: <cleanup> c s t � | | � S)N)r= )r8 r9 )r: r r �helper� s z contextmanager.<locals>.helper)r )r: rO r )r: r r � s c @ s: e Z d Z d Z d d � Z d d � Z d d � Z d S) r a2 Context to automatically close something at the end of a block. Code like this: with closing(<module>.open(<arguments>)) as f: <block> is equivalent to this: f = <module>.open(<arguments>) try: <block> finally: f.close() c C s | | _ d S)N)�thing)r$ rP r r r rB � s zclosing.__init__c C s | j S)N)rP )r$ r r r r% � s zclosing.__enter__c G s | j j � d S)N)rP �close)r$ rL r r r r) � s zclosing.__exit__N)r, r- r. r/ rB r% r) r r r r r � s c @ s: e Z d Z d Z d d � Z d d � Z d d � Z d S)�_RedirectStreamNc C s | | _ g | _ d S)N)� _new_target� _old_targets)r$ � new_targetr r r rB � s z_RedirectStream.__init__c C s9 | j j t t | j � � t t | j | j � | j S)N)rT r r? rK �_stream�setattrrS )r$ r r r r% � s z_RedirectStream.__enter__c C s t t | j | j j � � d S)N)rW rK rV rT �pop)r$ �exctype�excinst�exctbr r r r) s z_RedirectStream.__exit__)r, r- r. rV rB r% r) r r r r rR � s rR c @ s e Z d Z d Z d Z d S)r aA Context manager for temporarily redirecting stdout to another file. # How to send help() to stderr with redirect_stdout(sys.stderr): help(dir) # How to write help() to a file with open('help.txt', 'w') as f: with redirect_stdout(f): help(pow) �stdoutN)r, r- r. r/ rV r r r r r s c @ s e Z d Z d Z d Z d S)r zCContext manager for temporarily redirecting stderr to another file.�stderrN)r, r- r. r/ rV r r r r r s c @ s: e Z d Z d Z d d � Z d d � Z d d � Z d S) r a? Context manager to suppress specified exceptions After the exception is suppressed, execution proceeds with the next statement following the with statement. with suppress(FileNotFoundError): os.remove(somefile) # Execution still resumes here if the file was already removed c G s | | _ d S)N)� _exceptions)r$ � exceptionsr r r rB ) s zsuppress.__init__c C s d S)Nr )r$ r r r r% , s zsuppress.__enter__c C s | d k o t | | j � S)N)� issubclassr^ )r$ rY rZ r[ r r r r) / s zsuppress.__exit__N)r, r- r. r/ rB r% r) r r r r r s c s � f d d � } | S)Nc sL x< | j } | | k r d S| d k s4 | � k r5 P| } q W| | _ d S)N)� __context__)�new_exc�old_exc� exc_context)� frame_excr r �_fix_exception_context@ s z3_make_context_fixer.<locals>._fix_exception_contextr )re rf r )re r �_make_context_fixer? s rg c C sD y | d j } | d � Wn" t k r? | | d _ � Yn Xd S)NrG )ra � BaseException)� exc_details� fixed_ctxr r r � _reraise_with_existing_contextO s rk c C s d d � S)Nc S s d S)Nr )rb rc r r r �<lambda>[ s z%_make_context_fixer.<locals>.<lambda>r )re r r r rg Z s c C s | \ } } } t d � d S)Nz!raise exc_type, exc_value, exc_tb)�exec)ri r& r' �exc_tbr r r rk _ s )� InstanceTypec C s# t | � } | t k r | j S| S)N)r@ ro rC )�objZobj_typer r r � _get_typek s rq c @ s� e Z d Z d Z d d � Z d d � Z d d � Z d d � Z d d � Z d d � Z d d � Z d d � Z d d � Z d S)r a� Context manager for dynamic management of a stack of exit callbacks For example: with ExitStack() as stack: files = [stack.enter_context(open(fname)) for fname in filenames] # All opened files will automatically be closed at the end of # the with statement, even if attempts to open files later # in the list raise an exception c C s t � | _ d S)N)r �_exit_callbacks)r$ r r r rB s zExitStack.__init__c C s+ t | � � } | j | _ t � | _ | S)z?Preserve the context stack by transferring it to a new instance)r@ rr r )r$ � new_stackr r r �pop_all� s zExitStack.pop_allc s/ � � f d d � } � | _ | j | � d S)z:Helper to correctly register callbacks to __exit__ methodsc s � � | � S)Nr )ri )�cm�cm_exitr r � _exit_wrapper� s z.ExitStack._push_cm_exit.<locals>._exit_wrapperN)�__self__�push)r$ ru rv rw r )ru rv r � _push_cm_exit� s zExitStack._push_cm_exitc C sR t | � } y | j } Wn" t k r= | j j | � Yn X| j | | � | S)a Registers a callback with the standard __exit__ method signature Can suppress exceptions the same way __exit__ methods can. Also accepts any object with an __exit__ method (registering a call to the method instead of the object itself) )rq r) r rr r rz )r$ �exit�_cb_type� exit_methodr r r ry � s zExitStack.pushc s2 � � � f d d � } � | _ | j | � � S)z\Registers an arbitrary callback and arguments. Cannot suppress exceptions. c s � � � � d S)Nr )r& rN �tb)r8 �callbackr9 r r rw � s z)ExitStack.callback.<locals>._exit_wrapper)� __wrapped__ry )r$ r r8 r9 rw r )r8 r r9 r r � s zExitStack.callbackc C s8 t | � } | j } | j | � } | j | | � | S)z�Enters the supplied context manager If successful, also pushes its __exit__ method as a callback and returns the result of the __enter__ method. )rq r) r% rz )r$ ru �_cm_type�_exitr r r r � enter_context� s zExitStack.enter_contextc C s | j d d d � d S)z$Immediately unwind the context stackN)r) )r$ r r r rQ � s zExitStack.closec C s | S)Nr )r$ r r r r% � s zExitStack.__enter__c G s� | d d k } t j � d } t | � } d } d } xv | j r� | j j � } y" | | � rt d } d } d } Wq; t j � } | | d | d � d } | } Yq; Xq; W| r� t | � | o� | S)Nr rG FT)NNN)rK rL rg rr rX rk ) r$ ri � received_excre rf �suppressed_exc� pending_raise�cb�new_exc_detailsr r r r) � s( zExitStack.__exit__N) r, r- r. r/ rB rt rz ry r r� rQ r% r) r r r r r s s c sL e Z d Z d Z � f d d � Z d d � Z d d � Z d d � Z � S) r z+Backwards compatibility alias for ExitStackc s' t j d t � t t | � j � d S)Nz*ContextStack has been renamed to ExitStack)r3 r4 r5 �superr rB )r$ )rC r r rB � s zContextStack.__init__c C s | j | � S)N)ry )r$ r r r r � register_exit� s zContextStack.register_exitc O s | j | | | � S)N)r )r$ r r8 r9 r r r �register� s zContextStack.registerc C s | j � S)N)rt )r$ r r r �preserve� s zContextStack.preserve)r, r- r. r/ rB r� r� r� r r )rC r r � s c @ s= e Z d Z d Z d d d � Z d d � Z d d � Z d S) r aM Context manager that does no additional processing. Used as a stand-in for a normal context manager, when a particular block of code is only sometimes used with a normal context manager: cm = optional_cm if condition else nullcontext() with cm: # Perform operation, using optional_cm if condition is True Nc C s | | _ d S)N)� enter_result)r$ r� r r r rB � s znullcontext.__init__c C s | j S)N)r� )r$ r r r r% s znullcontext.__enter__c G s d S)Nr )r$ �excinfor r r r) s znullcontext.__exit__)r, r- r. r/ rB r% r) r r r r r � s )r r )$r/ r0 rK r3 � collectionsr � functoolsr �__all__� version_infor �_abc_ABC�ABCMeta�objectr r# r r r= r r rR r r r rI rg rk �typesro � ImportErrorr@ rq r r r r r r r �<module> sL (H " q