o
    {,h                     @   s   d Z ddlmZmZ ddlmZ G dd deZG dd deZG dd	 d	eZG d
d deZ	G dd deZ
G dd deZdS )z;Database functions that do comparisons or type conversions.    )FuncValue)_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 )Castz)Coerce an expression to a new field type.CASTz,%(function)s(%(expressions)s AS %(db_type)s)c                    s   t  j||d d S )N)output_field)super__init__)self
expressionr   	__class__ [/var/www/html/rh/venv/lib/python3.10/site-packages/django/db/models/functions/comparison.pyr	      s   zCast.__init__c                    s&   | j ||d< t j||fi |S )Ndb_type)r   cast_db_typer   as_sqlr
   compiler
connectionextra_contextr   r   r   r      s   zCast.as_sqlc           	         s   | j |}|dv r-d}t j||fd|i|\}}|dkr!dnd}|d| ||fS |dkr@d	}t j||fd|i|S | j||fi |S )
N>   timedatetimezstrftime(%%s, %(expressions)s)templater   z%H:%M:%fz%Y-%m-%d %H:%M:%fr   datezdate(%(expressions)s))r   r   r   r   insert)	r
   r   r   r   r   r   sqlparamsformat_stringr   r   r   	as_sqlite   s.   
zCast.as_sqlitec                 K   sF   d }| j  }|dkrd}n	|dkr|jrd}| j||fd|i|S )N
FloatFieldz(%(expressions)s + 0.0)	JSONFieldz"JSON_EXTRACT(%(expressions)s, '$')r   )r   get_internal_typemysql_is_mariadbr   )r
   r   r   r   r   output_typer   r   r   as_mysql&   s   
zCast.as_mysqlc                 K   s   | j ||fddi|S )Nr   z(%(expressions)s)::%(db_type)s)r   r   r   r   r   as_postgresql1   s   zCast.as_postgresqlc                    s@   | j  dkrd}t j||fd|i|S | j||fi |S )Nr!   z JSON_QUERY(%(expressions)s, '$')r   )r   r"   r   r   )r
   r   r   r   r   r   r   r   	as_oracle<   s   zCast.as_oracle)__name__
__module____qualname____doc__functionr   r	   r   r   r%   r&   r'   __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 Z fddZ  Z	S )	Coalescez:Return, from left to right, the first non-null expression.COALESCEc                    *   t |dk r
tdt j|i | d S )N   z+Coalesce must take at least two expressionslen
ValueErrorr   r	   r
   expressionsextrar   r   r   r	   K      zCoalesce.__init__c                 C   s0   |   D ]}|j}|tu s|d ur|  S qd S )N)get_source_expressionsempty_result_set_valueNotImplemented)r
   r   resultr   r   r   r:   P   s   zCoalesce.empty_result_set_valuec                    s\   | j  dkr$|  }|dd |  D  tt|j||fi |S | j||fi |S )N	TextFieldc                 S   s   g | ]}t |d dqS )TO_NCLOB)r,   )r   ).0r   r   r   r   
<listcomp>^   s    
z&Coalesce.as_oracle.<locals>.<listcomp>)r   r"   copyset_source_expressionsr9   r   r.   r   )r
   r   r   r   cloner   r   r   r'   X   s   zCoalesce.as_oracle)
r(   r)   r*   r+   r,   r	   propertyr:   r'   r-   r   r   r   r   r.   F   s    
r.   c                       s<   e Zd ZdZdZdZedZ fddZ fddZ	  Z
S )	CollateCOLLATEz*%(expressions)s %(function)s %(collation)sFz^[\w-]+$c                    s2   |r| j |std| || _t | d S )NzInvalid collation name: %r.)collation_rematchr4   	collationr   r	   )r
   r   rI   r   r   r   r	   o   s   zCollate.__init__c                    s,   | d|j| j t j||fi |S )NrI   )
setdefaultops
quote_namerI   r   r   r   r   r   r   r   u   s   zCollate.as_sql)r(   r)   r*   r,   r   allowed_defaultr   rG   r	   r   r-   r   r   r   r   rE   g   s    rE   c                       0   e Zd ZdZdZ fddZ fddZ  ZS )Greatestz
    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.
    GREATESTc                    r0   )Nr1   z+Greatest must take at least two expressionsr2   r5   r   r   r   r	      r8   zGreatest.__init__c                       t  j||fddi|S )zUse the MAX function on SQLite.r,   MAXr   r   r   r   r   r   r         zGreatest.as_sqliter(   r)   r*   r+   r,   r	   r   r-   r   r   r   r   rO   z   
    rO   c                       rN   )Leastz
    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.
    LEASTc                    r0   )Nr1   z(Least must take at least two expressionsr2   r5   r   r   r   r	      r8   zLeast.__init__c                    rQ   )zUse the MIN function on SQLite.r,   MINrS   r   r   r   r   r      rT   zLeast.as_sqliterU   r   r   r   r   rW      rV   rW   c                       s$   e Zd ZdZdZ fddZ  ZS )NullIfNULLIFr1   c                    s>   |   d }t|tr|jd u rtdt j||fi |S )Nr   z2Oracle does not allow Value(None) for expression1.)r9   
isinstancer   valuer4   r   r   )r
   r   r   r   expression1r   r   r   r'      s   zNullIf.as_oracle)r(   r)   r*   r,   arityr'   r-   r   r   r   r   rZ      s    rZ   N)r+   django.db.models.expressionsr   r   django.utils.regex_helperr   r   r.   rE   rO   rW   rZ   r   r   r   r   <module>   s    ?!