U
    Cvf                     @  s   d dl m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 d dlmZmZ e
rd dlZd dlmZ d dlmZ dd	d
gZdd Zdd Zdd Zdd Zdd ZddddZejddddddZdddd Zd!d"d#d$d%ZdS )&    )annotationsN)entry_points)TYPE_CHECKINGAny)BACKEND_ENTRYPOINTSBackendEntrypoint)BufferedIOBase)AbstractDataStoreZnetcdf4Zh5netcdfZscipyc                 C  s   t | dd d} tj| dd d}g }|D ]n\}}tt|}||d  t|}|dkr*dd |D }|d }td	| d
| d| d| d	t	 q*|S )Nc                 S  s   | j S Nnameep r   ;/tmp/pip-unpacked-wheel-h316xyqg/xarray/backends/plugins.py<lambda>       z#remove_duplicates.<locals>.<lambda>)keyc                 S  s   | j S r
   r   r   r   r   r   r      r   r      c                 S  s   g | ]}|j d d qS ):r   )valuesplit).0er   r   r   
<listcomp>"   s     z%remove_duplicates.<locals>.<listcomp>zFound z! entrypoints for the engine name z:
 z.
 The entrypoint z will be used.)
sorted	itertoolsgroupbylistsetappendlenwarningswarnRuntimeWarning)entrypointsZentrypoints_groupedZunique_entrypointsr   matchesZmatches_lenZall_module_namesZselected_module_namer   r   r   remove_duplicates   s    r'   c                 C  sf   t | }|j}g }| D ]@\}}|jt jjt jjfkrJtd| d|dkr|	| qt
|S )NzAll the parameters in zB signature should be explicit. *args and **kwargs is not supportedself)inspect	signature
parametersitemskind	ParameterVAR_KEYWORDVAR_POSITIONAL	TypeErrorr    tuple)open_datasetr*   r+   Zparameters_listr   paramr   r   r   detect_parameters-   s    

r5   c                 C  sh   i }| D ]Z}|j }z| }|||< W q tk
r` } ztd|d| t W 5 d }~X Y qX q|S )NzEngine z loading failed:
)r   load	Exceptionr"   r#   r$   )r%   backend_entrypointsZ
entrypointr   backendexr   r   r   backends_dict_from_pkg?   s    ,r;   c                 C  s0   |   D ]"\}}|jd kr|j}t||_qd S r
   )r,   Zopen_dataset_parametersr3   r5   )r8   r   r9   r3   r   r   r   set_missing_parametersK   s    
r<   c                   sL   i }t D ]"} |d d k	r |||< q| fddt D  |S )Nc                   s   i | ]}| | qS r   r   )r   r   r8   r   r   
<dictcomp>X   s      z!sort_backends.<locals>.<dictcomp>)STANDARD_BACKENDS_ORDERgetpopupdater   )r8   Zordered_backends_entrypointsZbe_namer   r=   r   sort_backendsR   s    rC   zdict[str, BackendEntrypoint])returnc                 C  s`   i }t  D ]\}}|jr|||< qt| } t| }|| t|}t| dd | D S )Nc                 S  s   i | ]\}}|| qS r   r   )r   r   r9   r   r   r   r>   g   s      z!build_engines.<locals>.<dictcomp>)r   r,   	availabler'   r;   rB   rC   r<   )r%   r8   backend_namer9   Zexternal_backend_entrypointsr   r   r   build_engines]   s    

rG   r   )maxsizec                  C  s,   t jdkrtdd} nt dd} t| S )a  
    Return a dictionary of available engines and their BackendEntrypoint objects.

    Returns
    -------
    dictionary

    Notes
    -----
    This function lives in the backends namespace (``engs=xr.backends.list_engines()``).
    If available, more information is available about each backend via ``engs["eng_name"]``.

    # New selection mechanism introduced with Python 3.10. See GH6514.
    )   
   zxarray.backends)groupr   )sysversion_infor   r@   rG   )r%   r   r   r   list_enginesj   s    
rN   z;str | os.PathLike[Any] | BufferedIOBase | AbstractDataStore)
store_specc              	   C  s   t  }| D ]H\}}z|| r,|W   S W q tk
rT   t|dt Y qX qg }t D ]N\}}z| }|| r|| W qd tk
r   t|dt Y qdX qddd |D }|s|rd| d}qd}nd| d}t	|d S )	Nz fails while guessingc                 S  s   g | ]}|d kr|qS )storer   )r   kr   r   r   r      s      z guess_engine.<locals>.<listcomp>zHdid not find a match in any of xarray's currently installed IO backends a  . Consider explicitly selecting one of the installed engines via the ``engine`` parameter, or installing additional IO dependencies, see:
https://docs.xarray.dev/en/stable/getting-started-guide/installing.html
https://docs.xarray.dev/en/stable/user-guide/io.htmla  xarray is unable to open this file because it has no currently installed IO backends. Xarray's read/write support requires installing optional IO dependencies, see:
https://docs.xarray.dev/en/stable/getting-started-guide/installing.html
https://docs.xarray.dev/en/stable/user-guide/iozIfound the following matches with the input file in xarray's IO backends: z. But their dependencies may not be installed, see:
https://docs.xarray.dev/en/stable/user-guide/io.html 
https://docs.xarray.dev/en/stable/getting-started-guide/installing.html)
rN   r,   Zguess_can_openr7   r"   r#   r$   r   r    
ValueError)rO   enginesenginer9   Zcompatible_enginesZbackend_clsZinstalled_engines	error_msgr   r   r   guess_engine   s2    



	
rV   zstr | type[BackendEntrypoint]r   )rT   rD   c                 C  sh   t | tr:t }| |kr0td|  dt| ||  }n*t | trVt| trV|  }ntd|  |S )z3Select open_dataset method based on current engine.zunrecognized engine z must be one of: zLengine must be a string or a subclass of xarray.backends.BackendEntrypoint: )	
isinstancestrrN   rR   r   type
issubclassr   r1   )rT   rS   r9   r   r   r   get_backend   s    

r[   )
__future__r   	functoolsr)   r   rL   r"   importlib.metadatar   typingr   r   Zxarray.backends.commonr   r   osior   r	   r?   r'   r5   r;   r<   rC   rG   	lru_cacherN   rV   r[   r   r   r   r   <module>   s.   

3