a
    Lcòf(!  ã                   @   s¸   d Z ddlmZ ddlmZmZ ddlmZ ddlm	Z	 ddl
mZ G dd„ deƒZG d	d
„ d
eƒZG dd„ deƒZG dd„ deƒZG dd„ deƒZG dd„ deƒZG dd„ deƒZdS )z;Database functions that do comparisons or type conversions.é    )ÚNotSupportedError)ÚFuncÚValue)Ú	TextField)Ú	JSONField)Ú_lazy_re_compilec                       s\   e Zd ZdZdZdZ‡ fdd„Z‡ fdd„Z‡ fdd	„Zd
d„ Z	dd„ Z
‡ fdd„Z‡  ZS )ÚCastz)Coerce an expression to a new field type.ZCASTz,%(function)s(%(expressions)s AS %(db_type)s)c                    s   t ƒ j||d� d S )N)Úoutput_field)ÚsuperÚ__init__)ÚselfÚ
expressionr	   ©Ú	__class__© úb/home/httpd/docs/test/DocsMgr/lib/python3.9/site-packages/django/db/models/functions/comparison.pyr      s    zCast.__init__c                    s&   | j  |¡|d< tƒ j||fi |¤ŽS )NÚdb_type)r	   Zcast_db_typer
   Úas_sql©r   ÚcompilerÚ
connectionÚextra_contextr   r   r   r      s    zCast.as_sqlc           	         s”   | j  |¡}|dv rZd}tƒ j||fd|i|¤Ž\}}|dkrBdnd}| d|¡ ||fS |dkr€d	}tƒ j||fd|i|¤ŽS | j||fi |¤ŽS )
N>   ÚtimeÚdatetimezstrftime(%%s, %(expressions)s)Útemplater   z%H:%M:%fz%Y-%m-%d %H:%M:%fr   Údatezdate(%(expressions)s))r	   r   r
   r   Úinsert)	r   r   r   r   r   r   ÚsqlÚparamsÚformat_stringr   r   r   Ú	as_sqlite   s.    ÿÿÿ
ÿÿÿzCast.as_sqlitec                 K   sF   d }| j  ¡ }|dkrd}n|dkr.|jr.d}| j||fd|i|¤ŽS )NZ
FloatFieldz(%(expressions)s + 0.0)r   z"JSON_EXTRACT(%(expressions)s, '$')r   )r	   Úget_internal_typeZmysql_is_mariadbr   )r   r   r   r   r   Úoutput_typer   r   r   Úas_mysql(   s    
zCast.as_mysqlc                 K   s   | j ||fddi|¤ŽS )Nr   z(%(expressions)s)::%(db_type)s©r   r   r   r   r   Úas_postgresql3   s    þýüzCast.as_postgresqlc                    s@   | j  ¡ dkr,d}tƒ j||fd|i|¤ŽS | j||fi |¤ŽS )Nr   z JSON_QUERY(%(expressions)s, '$')r   )r	   r!   r
   r   )r   r   r   r   r   r   r   r   Ú	as_oracle>   s    ÿÿÿzCast.as_oracle)Ú__name__Ú
__module__Ú__qualname__Ú__doc__Úfunctionr   r   r   r    r#   r%   r&   Ú__classcell__r   r   r   r   r   	   s   r   c                       s<   e Zd ZdZdZ‡ fdd„Zedd„ ƒZ‡ fdd„Z‡  Z	S )	ÚCoalescez:Return, from left to right, the first non-null expression.ZCOALESCEc                    s*   t |ƒdk rtdƒ‚tƒ j|i |¤Ž d S )Né   z+Coalesce must take at least two expressions©ÚlenÚ
ValueErrorr
   r   ©r   ÚexpressionsÚextrar   r   r   r   M   s    zCoalesce.__init__c                 C   s0   |   ¡ D ]"}|j}|tu s"|d ur|  S qd S ©N)Úget_source_expressionsÚempty_result_set_valueÚNotImplemented)r   r   Úresultr   r   r   r7   R   s
    
zCoalesce.empty_result_set_valuec                    s\   | j  ¡ dkrH|  ¡ }| dd„ |  ¡ D ƒ¡ tt|ƒj||fi |¤ŽS | j||fi |¤ŽS )Nr   c                 S   s   g | ]}t |d d�‘qS )ZTO_NCLOB)r+   )r   )Ú.0r   r   r   r   Ú
<listcomp>`   s   ÿz&Coalesce.as_oracle.<locals>.<listcomp>)r	   r!   ÚcopyÚset_source_expressionsr6   r
   r-   r   )r   r   r   r   Úcloner   r   r   r&   Z   s    þÿzCoalesce.as_oracle)
r'   r(   r)   r*   r+   r   Úpropertyr7   r&   r,   r   r   r   r   r-   H   s   
r-   c                       s8   e Zd ZdZdZedƒZ‡ fdd„Z‡ fdd„Z‡  Z	S )ÚCollateZCOLLATEz*%(expressions)s %(function)s %(collation)sz	^[\w\-]+$c                    s2   |r| j  |¡std| ƒ‚|| _tƒ  |¡ d S )NzInvalid collation name: %r.)Úcollation_reÚmatchr1   Ú	collationr
   r   )r   r   rC   r   r   r   r   p   s    zCollate.__init__c                    s,   |  d|j | j¡¡ tƒ j||fi |¤ŽS )NrC   )Ú
setdefaultÚopsZ
quote_namerC   r
   r   r   r   r   r   r   v   s    zCollate.as_sql)
r'   r(   r)   r+   r   r   rA   r   r   r,   r   r   r   r   r@   i   s
   r@   c                       s0   e Zd ZdZdZ‡ fdd„Z‡ fdd„Z‡  ZS )ÚGreatestzý
    Return the maximum expression.

    If any expression is null the return value is database-specific:
    On PostgreSQL, the maximum not-null expression is returned.
    On MySQL, Oracle, and SQLite, if any expression is null, null is returned.
    ZGREATESTc                    s*   t |ƒdk rtdƒ‚tƒ j|i |¤Ž d S )Nr.   z+Greatest must take at least two expressionsr/   r2   r   r   r   r   †   s    zGreatest.__init__c                    s   t ƒ j||fddi|¤ŽS )zUse the MAX function on SQLite.r+   ÚMAX©r
   r    r   r   r   r   r    ‹   s    zGreatest.as_sqlite©r'   r(   r)   r*   r+   r   r    r,   r   r   r   r   rF   {   s   rF   c                       sF   e Zd ZdZeƒ Z‡ fdd„Z‡ fdd„Z‡ fdd„Zdd	„ Z	‡  Z
S )
Ú
JSONObjectZJSON_OBJECTc                    s8   g }|  ¡ D ]\}}| t|ƒ|f¡ qtƒ j|Ž  d S r5   )ÚitemsÚextendr   r
   r   )r   Úfieldsr3   ÚkeyÚvaluer   r   r   r   ”   s    zJSONObject.__init__c                    s&   |j jstdƒ‚tƒ j||fi |¤ŽS )Nz7JSONObject() is not supported on this database backend.)ÚfeaturesZhas_json_object_functionr   r
   r   r   r   r   r   r   š   s
    ÿzJSONObject.as_sqlc                    sB   |   ¡ }| dd„ t| ¡ ƒD ƒ¡ tt|ƒj||fddi|¤ŽS )Nc                 S   s,   g | ]$\}}|d  dkr$t |tƒ ƒn|‘qS )r.   r   )r   r   )r:   Úindexr   r   r   r   r;   ¤   s   ÿz,JSONObject.as_postgresql.<locals>.<listcomp>r+   ZJSONB_BUILD_OBJECT)r<   r=   Ú	enumerater6   r
   rJ   r   )r   r   r   r   r<   r   r   r   r%   ¡   s    
þÿ
þýüzJSONObject.as_postgresqlc                 K   s*   G dd„ dƒ}| j ||f|ƒ ddœ|¤ŽS )Nc                   @   s   e Zd Zdd„ ZdS )z'JSONObject.as_oracle.<locals>.ArgJoinerc                 S   s2   dd„ t |d d d… |dd d… ƒD ƒ}d |¡S )Nc                 S   s   g | ]}d   |¡‘qS )z VALUE )Újoin)r:   Úargr   r   r   r;   ³   ó    z@JSONObject.as_oracle.<locals>.ArgJoiner.join.<locals>.<listcomp>r.   é   z, )ÚziprS   )r   Úargsr   r   r   rS   ²   s    (z,JSONObject.as_oracle.<locals>.ArgJoiner.joinN)r'   r(   r)   rS   r   r   r   r   Ú	ArgJoiner±   s   rY   z,%(function)s(%(expressions)s RETURNING CLOB))Z
arg_joinerr   r$   )r   r   r   r   rY   r   r   r   r&   °   s    þüûzJSONObject.as_oracle)r'   r(   r)   r+   r   r	   r   r   r%   r&   r,   r   r   r   r   rJ   �   s   rJ   c                       s0   e Zd ZdZdZ‡ fdd„Z‡ fdd„Z‡  ZS )ÚLeastzó
    Return the minimum expression.

    If any expression is null the return value is database-specific:
    On PostgreSQL, return the minimum not-null expression.
    On MySQL, Oracle, and SQLite, if any expression is null, return null.
    ZLEASTc                    s*   t |ƒdk rtdƒ‚tƒ j|i |¤Ž d S )Nr.   z(Least must take at least two expressionsr/   r2   r   r   r   r   Ê   s    zLeast.__init__c                    s   t ƒ j||fddi|¤ŽS )zUse the MIN function on SQLite.r+   ZMINrH   r   r   r   r   r    Ï   s    zLeast.as_sqliterI   r   r   r   r   rZ   ¿   s   rZ   c                       s$   e Zd ZdZdZ‡ fdd„Z‡  ZS )ÚNullIfZNULLIFr.   c                    s>   |   ¡ d }t|tƒr(|jd u r(tdƒ‚tƒ j||fi |¤ŽS )Nr   z2Oracle does not allow Value(None) for expression1.)r6   Ú
isinstancer   rO   r1   r
   r   )r   r   r   r   Zexpression1r   r   r   r&   Ø   s    zNullIf.as_oracle)r'   r(   r)   r+   Úarityr&   r,   r   r   r   r   r[   Ô   s   r[   N)r*   Z	django.dbr   Zdjango.db.models.expressionsr   r   Zdjango.db.models.fieldsr   Zdjango.db.models.fields.jsonr   Zdjango.utils.regex_helperr   r   r-   r@   rF   rJ   rZ   r[   r   r   r   r   Ú<module>   s   ?!/