U
     5øi›,  ã                   @   s„   d dl mZmZ d dlmZmZmZmZmZ d dl	m
Z
 d dlmZ d dlmZ d dlmZ dgZG dd„ dƒZG d	d
„ d
eƒZdS )é    )Únames_digestÚsplit_identifier)ÚColÚExpressionListÚFÚFuncÚOrderBy©ÚCollate)ÚQ)ÚQuery)Ú	partitionÚIndexc                   @   sz   e Zd ZdZdZdddddddœdd„Zedd	„ ƒZd
d„ Zddd„Z	dd„ Z
dd„ Zdd„ Zdd„ Zdd„ Zdd„ ZdS )r   Úidxé   © N)ÚfieldsÚnameÚdb_tablespaceÚ	opclassesÚ	conditionÚincludec                G   st  |r|st dƒ‚t|td ƒtfƒs*t dƒ‚|r:|s:t dƒ‚t|ttfƒsPt dƒ‚t|ttfƒsft dƒ‚|sv|svt dƒ‚|r†|r†t dƒ‚|r–|s–t dƒ‚|r¦|r¦t d	ƒ‚|rÂt|ƒt|ƒkrÂt d
ƒ‚|ràtdd„ |D ƒƒsàt dƒ‚|rð|sðt dƒ‚t|td ƒttfƒ�st dƒ‚t|ƒ| _dd„ | jD ƒ| _	|�p2d| _
|| _|| _|| _|�rVt|ƒnd| _tdd„ |D ƒƒ| _d S )Nz(An index must be named to use opclasses.z%Index.condition must be a Q instance.z(An index must be named to use condition.z%Index.fields must be a list or tuple.z(Index.opclasses must be a list or tuple.z@At least one field or expression is required to define an index.z4Index.fields and expressions are mutually exclusive.z*An index must be named to use expressions.zgIndex.opclasses cannot be used with expressions. Use django.contrib.postgres.indexes.OpClass() instead.zGIndex.fields and Index.opclasses must have the same number of elements.c                 s   s   | ]}t |tƒV  qd S ©N)Ú
isinstanceÚstr)Ú.0Úfieldr   r   ú</tmp/pip-unpacked-wheel-gcyiijx6/django/db/models/indexes.pyÚ	<genexpr>7   s     z!Index.__init__.<locals>.<genexpr>z8Index.fields must contain only strings with field names.zA covering index must be named.z&Index.include must be a list or tuple.c                 S   s.   g | ]&}|  d ¡r"|dd… dfn|df‘qS )ú-é   NZDESCÚ )Ú
startswith©r   Ú
field_namer   r   r   Ú
<listcomp>?   s   ÿz"Index.__init__.<locals>.<listcomp>r!   r   c                 s   s$   | ]}t |tƒrt|ƒn|V  qd S r   )r   r   r   )r   Ú
expressionr   r   r   r   H   s   ÿ)Ú
ValueErrorr   Útyper   ÚlistÚtupleÚlenÚallr   Úfields_ordersr   r   r   r   r   Úexpressions)Úselfr   r   r   r   r   r   r.   r   r   r   Ú__init__   sX    
ÿÿÿ
þþzIndex.__init__c                 C   s
   t | jƒS r   )Úboolr.   ©r/   r   r   r   Úcontains_expressionsM   s    zIndex.contains_expressionsc                    s`   | j d krd S t|dd�}| | j ¡}|jˆ jd�}| |ˆ j¡\}}|t‡ fdd„|D ƒƒ S )NF)ÚmodelÚ
alias_cols)Ú
connectionc                 3   s   | ]}ˆ   |¡V  qd S r   )Zquote_value)r   Úp©Úschema_editorr   r   r   X   s     z+Index._get_condition_sql.<locals>.<genexpr>)r   r   Zbuild_whereZget_compilerr6   Úas_sqlr*   )r/   r4   r9   ÚqueryÚwhereÚcompilerZsqlÚparamsr   r8   r   Ú_get_condition_sqlQ   s    
zIndex._get_condition_sqlr!   c                    sÈ   ‡ fdd„| j D ƒ}|  ˆ |¡}| jrtg }| jD ]"}t|ƒ}	|	 |j¡ | |	¡ q0t|Ž  t	ˆ dd�¡}
d }d }n(‡ fdd„| j
D ƒ}dd„ | j
D ƒ}d }
|jˆ f|| j|| j|| j|||
dœ	|—ŽS )Nc                    s   g | ]}ˆ j  |¡j‘qS r   ©Ú_metaÚ	get_fieldÚcolumnr#   ©r4   r   r   r%   [   s     z$Index.create_sql.<locals>.<listcomp>F)r5   c                    s   g | ]\}}ˆ j  |¡‘qS r   )rA   rB   )r   r$   Ú_rD   r   r   r%   i   s   ÿc                 S   s   g | ]}|d  ‘qS )r    r   )r   Úorderr   r   r   r%   m   s     )	r   r   Úusingr   Úcol_suffixesr   r   r   r.   )r   r?   r.   ÚIndexExpressionÚset_wrapper_classesr6   Úappendr   Úresolve_expressionr   r-   Z_create_index_sqlr   r   r   )r/   r4   r9   rG   Úkwargsr   r   Úindex_expressionsr&   Zindex_expressionr.   r   rH   r   rD   r   Ú
create_sqlZ   sB    

ÿ
þÿ     üüzIndex.create_sqlc                 K   s   |j || jf|ŽS r   )Z_delete_index_sqlr   )r/   r4   r9   rM   r   r   r   Ú
remove_sqlv   s    zIndex.remove_sqlc                 C   sŠ   d| j j| j jf }| dd¡}d| ji}| jr:| j|d< | jd k	rN| j|d< | jr^| j|d< | jrn| j|d< | j	r~| j	|d	< || j
|fS )
Nz%s.%szdjango.db.models.indexeszdjango.db.modelsr   r   r   r   r   r   )Ú	__class__Ú
__module__Ú__name__Úreplacer   r   r   r   r   r   r.   )r/   ÚpathrM   r   r   r   Údeconstructy   s    






zIndex.deconstructc                 C   s   |   ¡ \}}}| j||ŽS )zCreate a copy of this Index.)rV   rQ   )r/   rE   ÚargsrM   r   r   r   Úclone‰   s    zIndex.clonec                    sÐ   t ˆ jjƒ\}}‡ fdd„| jD ƒ}dd„ t|| jƒD ƒ}|g| | jg }d|dd… |d dd… d	t|d
diŽ| jf f | _t| jƒ| j	krœt
dƒ‚| jd dks¸| jd  ¡ rÌd| jdd…  | _dS )a  
        Generate a unique name for the index.

        The name is divided into 3 parts - table name (12 chars), field name
        (8 chars) and unique hash + suffix (10 chars). Each part is made to
        fit its size by truncating the excess length.
        c                    s   g | ]\}}ˆ j  |¡j‘qS r   r@   )r   r$   rF   rD   r   r   r%   —   s     z-Index.set_name_with_model.<locals>.<listcomp>c                 S   s$   g | ]\}\}}|rd nd| ‘qS )z-%sz%sr   )r   Zcolumn_namer$   rF   r   r   r   r%   ˜   s   
ÿz%s_%s_%sNé   r   é   z%s_%sÚlengthé   zVIndex too long for multiple database support. Is self.suffix longer than 3 characters?rE   zD%sr    )r   rA   Zdb_tabler-   ÚzipÚsuffixr   r   r+   Úmax_name_lengthr'   Úisdigit)r/   r4   rE   Z
table_nameZcolumn_namesZcolumn_names_with_orderZ	hash_datar   rD   r   Úset_name_with_modelŽ   s"    
þ
ýÿzIndex.set_name_with_modelc                 C   s¬   d| j j| jsdndt| jƒ | js(dndt| jƒ | js>dndt| jƒ | jd krXdndt| jƒ | jd krrdnd| j | js„dndt| jƒ | j	sšdnd	t| j	ƒ f S )
Nz<%s:%s%s%s%s%s%s%s>r!   z
 fields=%sz expressions=%sz name=%sz db_tablespace=%sz condition=%sz include=%sz opclasses=%s)
rQ   Ú__qualname__r   Úreprr.   r   r   r   r   r   r2   r   r   r   Ú__repr__¬   s    ÿözIndex.__repr__c                 C   s    | j |j kr|  ¡ | ¡ kS tS r   )rQ   rV   ÚNotImplemented)r/   Úotherr   r   r   Ú__eq__º   s    zIndex.__eq__)r!   )rS   rR   rb   r^   r_   r0   Úpropertyr3   r?   rO   rP   rV   rX   ra   rd   rg   r   r   r   r   r      s&   ø<
	
c                       sL   e Zd ZdZdZeefZddd„Ze	dd„ ƒZ
d‡ fd
d„	Zdd„ Z‡  ZS )rI   z7Order and wrap expressions for CREATE INDEX statements.z%(expressions)sNc                 C   s&   |r"|j jr"tdd„ | jD ƒƒ| _d S )Nc                 S   s   g | ]}|t k	r|‘qS r   r	   ©r   Zwrapper_clsr   r   r   r%   È   s   þz7IndexExpression.set_wrapper_classes.<locals>.<listcomp>)ÚfeaturesZcollate_as_index_expressionr*   Úwrapper_classes)r/   r6   r   r   r   rJ   Å   s    þz#IndexExpression.set_wrapper_classesc                 G   s
   || _ d S r   )rk   )Úclsrk   r   r   r   Úregister_wrappersÎ   s    z!IndexExpression.register_wrappersTFc                    sb  t ˆ  ¡ ƒ}t‡ fdd„|ƒ\}}dd„ |D ƒ}	t|	ƒtt|	ƒƒkrbtdd dd„ ˆ jD ƒ¡ ƒ‚|dt|ƒd … |kr˜td	d d
d„ ˆ jD ƒ¡ ƒ‚|d }
|
 |||||¡}t	|t
ƒsÈt|
dd�}
|�rBt|‡ fdd„d�}dd„ |D ƒ}t|d d… ƒD ]\}}| ||d  g¡ �q |d  |
g¡ ˆ  |d g¡ nˆ  |
g¡ tƒ  |||||¡S )Nc                    s   t | ˆ jƒS r   )r   rk   )Úer2   r   r   Ú<lambda>Ý   ó    z4IndexExpression.resolve_expression.<locals>.<lambda>c                 S   s   g | ]}t |ƒ‘qS r   )r(   ©r   Úwrapperr   r   r   r%   à   s     z6IndexExpression.resolve_expression.<locals>.<listcomp>zAMultiple references to %s can't be used in an indexed expression.z, c                 S   s   g | ]
}|j ‘qS r   ©rb   ri   r   r   r   r%   ä   s    r    z8%s must be topmost expressions in an indexed expression.c                 S   s   g | ]
}|j ‘qS r   rs   ri   r   r   r   r%   ë   s    z(%(expressions)s))Útemplatec                    s   ˆ j  t| ƒ¡S r   )rk   Úindexr(   )Úwr2   r   r   ro   ÿ   rp   )Úkeyc                 S   s   g | ]}|  ¡ ‘qS r   )Úcopyrq   r   r   r   r%     s     éÿÿÿÿr   )r)   Úflattenr   r+   Úsetr'   Újoinrk   rL   r   r   r   ÚsortedÚ	enumerateZset_source_expressionsÚsuper)r/   r;   Zallow_joinsZreuseZ	summarizeZfor_saver.   rN   ÚwrappersZwrapper_typesZroot_expressionZresolve_root_expressionÚirr   ©rQ   r2   r   rL   Ò   sX    
þ
ÿÿÿ
ÿÿÿû

þz"IndexExpression.resolve_expressionc                 K   s   | j ||f|ŽS r   )r:   )r/   r=   r6   Zextra_contextr   r   r   Ú	as_sqlite  s    zIndexExpression.as_sqlite)N)NTNFF)rS   rR   rb   Ú__doc__rt   r   r
   rk   rJ   Úclassmethodrm   rL   rƒ   Ú__classcell__r   r   r‚   r   rI   À   s   
	
     ú:rI   N)Zdjango.db.backends.utilsr   r   Zdjango.db.models.expressionsr   r   r   r   r   Zdjango.db.models.functionsr
   Zdjango.db.models.query_utilsr   Zdjango.db.models.sqlr   Zdjango.utils.functionalr   Ú__all__r   rI   r   r   r   r   Ú<module>   s    6