o
    eC!                     @   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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.    )NotSupportedError)FuncValue)	TextField)	JSONField)_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__ X/var/www/html/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)r   z"JSON_EXTRACT(%(expressions)s, '$')r   )r
   get_internal_typemysql_is_mariadbr   )r   r   r   r   r   output_typer   r   r   as_mysql(   s   
zCast.as_mysqlc                 K   s   | j ||fddi|S )Nr   z(%(expressions)s)::%(db_type)sr   r   r   r   r   as_postgresql3   s   zCast.as_postgresqlc                    s@   | j  dkrd}t j||fd|i|S | j||fi |S )Nr   z JSON_QUERY(%(expressions)s, '$')r   )r
   r$   r   r   )r   r   r   r   r   r   r   r   	as_oracle>   s   zCast.as_oracle)__name__
__module____qualname____doc__functionr   r   r   r"   r'   r)   r*   __classcell__r   r   r   r   r   	   s    r   c                       s<   e Zd ZdZdZ fddZedd Z fddZ  Z	S )	Coalescez:Return, from left to right, the first non-null expression.COALESCEc                    *   t |dk r
tdt j|i | d S )N   z+Coalesce must take at least two expressionslen
ValueErrorr   r   r   expressionsextrar   r   r   r   M      zCoalesce.__init__c                 C   s0   |   D ]}|j}|tu s|d ur|  S qd S N)get_source_expressionsempty_result_set_valueNotImplemented)r   r   resultr   r   r   r>   R   s   zCoalesce.empty_result_set_valuec                    s\   | j  dkr$|  }|dd |  D  tt|j||fi |S | j||fi |S )Nr   c                 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$   copyset_source_expressionsr=   r   r1   r   )r   r   r   r   cloner   r   r   r*   Z   s   zCoalesce.as_oracle)
r+   r,   r-   r.   r/   r   propertyr>   r*   r0   r   r   r   r   r1   H   s    
r1   c                       s<   e Zd ZdZdZdZedZ fddZ fddZ	  Z
S )	CollateCOLLATEz*%(expressions)s %(function)s %(collation)sFz^[\w-]+$c                    s2   |r| j |std| || _t | d S )NzInvalid collation name: %r.)collation_rematchr7   	collationr   r   )r   r   rL   r   r   r   r   q   s   zCollate.__init__c                    s,   | d|j| j t j||fi |S )NrL   )
setdefaultops
quote_namerL   r   r   r   r   r   r   r   w   s   zCollate.as_sql)r+   r,   r-   r/   r   allowed_defaultr   rJ   r   r   r0   r   r   r   r   rH   i   s    rH   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                    r3   )Nr4   z+Greatest must take at least two expressionsr5   r8   r   r   r   r      r;   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"   r0   r   r   r   r   rR   |   
    rR   c                       sF   e Zd ZdZe Z fddZ fddZ fddZdd	 Z	  Z
S )

JSONObjectJSON_OBJECTc                    s8   g }|  D ]\}}|t||f qt j|  d S r<   )itemsextendr   r   r   )r   fieldsr9   keyvaluer   r   r   r      s   zJSONObject.__init__c                    s&   |j jstdt j||fi |S )Nz7JSONObject() is not supported on this database backend.)featureshas_json_object_functionr   r   r   r   r   r   r   r      s
   zJSONObject.as_sqlc                    sB   |   }|dd t| D  tt|j||fddi|S )Nc                 S   s,   g | ]\}}|d  dkrt |t n|qS )r4   r   )r   r   )rB   indexr   r   r   r   rC      s    z,JSONObject.as_postgresql.<locals>.<listcomp>r/   JSONB_BUILD_OBJECT)rD   rE   	enumerater=   r   rZ   r   )r   r   r   r   rD   r   r   r   r)      s   

zJSONObject.as_postgresqlc                 K   s*   G dd d}| j ||f| dd|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 D }d|S )Nc                 S   s   g | ]}d  |qS )z VALUE )join)rB   argr   r   r   rC      s    z@JSONObject.as_oracle.<locals>.ArgJoiner.join.<locals>.<listcomp>r4      z, )ziprf   )r   argsr   r   r   rf      s   (
z,JSONObject.as_oracle.<locals>.ArgJoiner.joinN)r+   r,   r-   rf   r   r   r   r   	ArgJoiner   s    rk   z,%(function)s(%(expressions)s RETURNING CLOB))
arg_joinerr   r(   )r   r   r   r   rk   r   r   r   r*      s   zJSONObject.as_oracle)r+   r,   r-   r/   r   r
   r   r   r)   r*   r0   r   r   r   r   rZ      s    rZ   c                       rQ   )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                    r3   )Nr4   z(Least must take at least two expressionsr5   r8   r   r   r   r      r;   zLeast.__init__c                    rT   )zUse the MIN function on SQLite.r/   MINrV   r   r   r   r   r"      rW   zLeast.as_sqliterX   r   r   r   r   rm      rY   rm   c                       s$   e Zd ZdZdZ fddZ  ZS )NullIfNULLIFr4   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.)r=   
isinstancer   r`   r7   r   r   )r   r   r   r   expression1r   r   r   r*      s   zNullIf.as_oracle)r+   r,   r-   r/   arityr*   r0   r   r   r   r   rp      s    rp   N)r.   	django.dbr   django.db.models.expressionsr   r   django.db.models.fieldsr   django.db.models.fields.jsonr   django.utils.regex_helperr   r   r1   rH   rR   rZ   rm   rp   r   r   r   r   <module>   s    ?!/