U
    Cvf                     @  s   d dl mZ d dlm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mZmZ eedddd	Zddd
dZddddZG dd dejjZdd ZeG dd dZdS )    )annotations)NumberN)_get_default_engine)assert_identicalassert_no_warningsrequires_daskrequires_netCDF4requires_scipyNonereturnc                  C  sD   t ddd} | dkstt d}|dks,tt d}|dks@td S )Nzhttp://example.org/test.ncT)Zallow_remoteZnetcdf4z/example.gzZscipyz/example)r   AssertionError)Zengine_remoteZ	engine_gzZengine_default r   B/tmp/pip-unpacked-wheel-h316xyqg/xarray/tests/test_backends_api.pytest__get_default_engine   s    r   c                    sj   t jtdtd dtdtdtddfdd G  fd	d
d
t jj} t jd| d}t | d S )N      )axs)Zunits)r   Zcoordsc                      s    e Zd Zddd fddZdS )z)test_custom_engine.<locals>.CustomBackendN
xr.Datasetr   c                   s    j ddS NT)deepcopyselfZfilename_or_objdrop_variableskwargsexpectedr   r   open_dataset&   s    z6test_custom_engine.<locals>.CustomBackend.open_dataset)N__name__
__module____qualname__r"   r   r    r   r   CustomBackend%   s    r'   fake_filenameengine)	xrDatasetdictnpZarangebackendsBackendEntrypointr"   r   )r'   actualr   r    r   test_custom_engine    s     	r2   c                    s^   t jddgddgdd  jddgd	 G  fd
ddt jj} t jd| d}t | d S )NAB   r   )coord1coord2r   r6   r7   )zc                      s    e Zd Zddd fddZdS )z*test_multiindex.<locals>.MultiindexBackendNr   r   c                   s    j ddS r   r   r   datasetr   r   r"   9   s    z7test_multiindex.<locals>.MultiindexBackend.open_dataset)Nr#   r   r9   r   r   MultiindexBackend8   s    r;   r(   r)   )r+   r,   stackr/   r0   r"   r   )r;   Zloadedr   r9   r   test_multiindex2   s
    	r=   c                   @  s   e Zd ZdZddddZdS )PassThroughBackendEntrypointz5Access an object passed to the `open_dataset` method.N)r   c                C  s   |S )zReturn the first argument.r   )r   r:   r   r   r   r   r"   H   s    z)PassThroughBackendEntrypoint.open_dataset)r$   r%   r&   __doc__r"   r   r   r   r   r>   E   s   r>   c                 C  s   t dd t| |D S )zLReturn explicit chunks, expanding any integer member to a tuple of integers.c                 s  sL   | ]D\}}t |tr@|| |f || s0|d kr:|| fnd n|V  qdS )r   r   N)
isinstancer   ).0chunksizer   r   r   	<genexpr>P   s   z"explicit_chunks.<locals>.<genexpr>)tuplezip)chunksshaper   r   r   explicit_chunksM   s    rI   c                   @  s   e Zd ZdZdZdd Zdd Zej	ddd	d
dgej	dddgdd Z
ej	ddddddgdd Zej	ddddddddd gd!d" Zd#S )$TestPreferredChunksz9Test behaviors related to the backend's preferred chunks.datac                 C  sT   t dd tt|D }t| jtj|tj|t	dddt
t||idiS )zKReturn a dataset with a variable with the given shape and preferred chunks.c                 s  s   | ]}d | V  qdS )Zdim_Nr   )rA   idxr   r   r   rD   c   s     z5TestPreferredChunks.create_dataset.<locals>.<genexpr>ZV1)dtypeZpreferred_chunks)encoding)rE   rangelenr+   r,   var_nameVariabler.   emptyrM   r-   rF   )r   rH   pref_chunksdimsr   r   r   create_dataseta   s     z"TestPreferredChunks.create_datasetc                 C  s"   t || || j j|kstd S )N)r   rQ   rG   r   )r   initialfinalZexpected_chunksr   r   r   check_datasetn   s    
z!TestPreferredChunks.check_datasetzshape,pref_chunks)r   r   )rZ   )r   r   r5   )r      )   r   )r]   )r_   )r   r   r   request_with_empty_mapFTc                 C  sP   |  ||}|ri nt|| j jd}tj|t|d}| ||t	|| dS )z<Honor the backend's preferred chunks when opening a dataset.Nr*   rG   )
rV   r-   fromkeysrQ   rU   r+   r"   r>   rY   rI   )r   rH   rT   r`   rW   rG   rX   r   r   r   test_honor_chunksr   s      z%TestPreferredChunks.test_honor_chunkszshape,pref_chunks,req_chunks)rZ   r[      )rZ   r[   )r   r5   r5   r5   )rZ   r\   rd   )rZ   r\   rf   ))r5   r   )r5   r   )r5   re   c              	   C  s\   |  ||}tt( tj|ttt|| j	 j
|d}W 5 Q R X | ||t|| dS )zGWarn when the requested chunks separate the backend's preferred chunks.ra   N)rV   pytestZwarnsUserWarningr+   r"   r>   r-   rF   rQ   rU   rY   rI   r   rH   rT   Z
req_chunksrW   rX   r   r   r   test_split_chunks   s    z%TestPreferredChunks.test_split_chunks)rZ   r[   r[   )rZ   r[   r\   )rZ   r[   )r_   )rZ   r[   )r^   )rZ   )r5   r5   r5   r   r5   )rZ   rk   r[   )rZ   rk   )r   re   ))r   r   )r   rl   )r_   rm   c              	   C  sX   |  ||}t ( tj|ttt|| j j|d}W 5 Q R X | 	||t
|| dS )zGDon't warn when the requested chunks join or keep the preferred chunks.ra   N)rV   r   r+   r"   r>   r-   rF   rQ   rU   rY   rI   ri   r   r   r   test_join_chunks   s    z$TestPreferredChunks.test_join_chunksN)r$   r%   r&   r?   rQ   rV   rY   rg   markZparametrizerc   rj   rn   r   r   r   r   rJ   [   sJ   
rJ   )
__future__r   Znumbersr   Znumpyr.   rg   Zxarrayr+   Zxarray.backends.apir   Zxarray.testsr   r   r   r   r	   r   r2   r=   r/   r0   r>   rI   rJ   r   r   r   r   <module>   s   	