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�ZdS )'z4Utilities for with-statement contexts. See PEP 343.� N)�deque)�wraps�asynccontextmanager�contextmanager�closing� nullcontext�AbstractContextManager�AbstractAsyncContextManager�AsyncExitStack�ContextDecorator� ExitStack�redirect_stdout�redirect_stderr�suppressc @ s2 e Zd ZdZdd� Zejdd� �Zedd� �Z dS ) r z,An abstract base class for context managers.c C s | S )z0Return `self` upon entering the runtime context.� )�selfr r � /usr/lib/python3.7/contextlib.py� __enter__ s z AbstractContextManager.__enter__c C s dS )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 krt�|dd�S tS )Nr r )r �_collections_abc�_check_methods�NotImplemented)�cls�Cr r r �__subclasshook__ s z'AbstractContextManager.__subclasshook__N)
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c s t � | |�S )N)r3 )r( r) )r* r r �helper� s z contextmanager.<locals>.helper)r )r* rF r )r* r r � s c s t � �� fdd��}|S )a� @asynccontextmanager decorator.
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aA Context manager for temporarily redirecting stdout to another file.
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zExitStack.__exit__c C s | � ddd� dS )z%Immediately unwind the context stack.N)r )r r r r rH s zExitStack.closeN)r r r r! r r rH r r r r r � s 1c @ s` e Zd ZdZedd� �Zedd� �Zdd� Zdd � Zd
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for i in range(5)]
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# connection later in the list raise an exception.
c s � �fdd�}|S )Nc � s �� | ||�I d H S )Nr )r r> rZ )r[ r\ r r r] ' s z@AsyncExitStack._create_async_exit_wrapper.<locals>._exit_wrapperr )r[ r\ r] r )r[ r\ r �_create_async_exit_wrapper% s z)AsyncExitStack._create_async_exit_wrapperc s � ^�� � ��fdd�}|S )Nc � s �� ��I d H d S )Nr )r r> rZ )r( r_ r) r r r] . s z>AsyncExitStack._create_async_cb_wrapper.<locals>._exit_wrapperr )r( r) r] r )r( r_ r) r �_create_async_cb_wrapper+ s z'AsyncExitStack._create_async_cb_wrapperc � s. t |�}|j}|�|�I dH }| �||� |S )z�Enters the supplied async context manager.
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r2 | �|d� Y nX | �||� |S )a# Registers a coroutine function with the standard __aexit__ method
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z AsyncExitStack.push_async_exitc O s~ t | �dkr| ^}}} n>| s&td��n0d|krB|�d�}| ^}} ntdt | �d ��|j|f| �|�}||_|�|d� |S )zfRegisters an arbitrary coroutine function and arguments.
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ro zMdescriptor 'push_async_callback' of 'AsyncExitStack' object needs an argumentr_ zCpush_async_callback expected at least 1 positional argument, got %dr8 F)rp rq rP r� rr re )r( r) r r_ r] r r r �push_async_callbackP s
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r aO Context manager that does no additional processing.
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# Perform operation, using optional_cm if condition is True
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