o
    ˷e                     @   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	 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)	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__ \/var/www/ideatree/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, '$')r   )r	   get_internal_typemysql_is_mariadbr   )r   r   r   r   r   output_typer   r   r   as_mysql'   s   
zCast.as_mysqlc                 K      | j ||fddi|S )Nr   z(%(expressions)s)::%(db_type)sr   r   r   r   r   as_postgresql2   s   zCast.as_postgresqlc                    s@   | j  dkrd}t j||fd|i|S | j||fi |S )Nr   z JSON_QUERY(%(expressions)s, '$')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   L      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>   Q   s   zCoalesce.empty_result_set_valuec                    s\   | j  dkr$|  }|dd |  D  tt|j||fi |S | j||fi |S )N	TextFieldc                 S   s   g | ]}t |d dqS )TO_NCLOB)r/   )r   ).0r   r   r   r   
<listcomp>_   s    
z&Coalesce.as_oracle.<locals>.<listcomp>)r	   r#   copyset_source_expressionsr=   r
   r1   r   )r   r   r   r   cloner   r   r   r*   Y   s   zCoalesce.as_oracle)
r+   r,   r-   r.   r/   r   propertyr>   r*   r0   r   r   r   r   r1   G   s    
r1   c                       s8   e Zd ZdZdZedZ fddZ fddZ  Z	S )CollateCOLLATEz*%(expressions)s %(function)s %(collation)sz	^[\w\-]+$c                    s2   |r| j |std| || _t | d S )NzInvalid collation name: %r.)collation_rematchr7   	collationr
   r   )r   r   rM   r   r   r   r   o   s   zCollate.__init__c                    s,   | d|j| j t j||fi |S )NrM   )
setdefaultops
quote_namerM   r
   r   r   r   r   r   r   u   s   zCollate.as_sql)
r+   r,   r-   r/   r   r   rK   r   r   r0   r   r   r   r   rI   h   s    rI   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   z   
    rR   c                       sB   e Zd ZdZe Z fddZ fddZ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                 K   r'   )Nr/   JSONB_BUILD_OBJECTr(   r   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)rC   argr   r   r   rD      s    z@JSONObject.as_oracle.<locals>.ArgJoiner.join.<locals>.<listcomp>r4      z, )ziprd   )r   argsr   r   r   rd      s   (
z,JSONObject.as_oracle.<locals>.ArgJoiner.joinN)r+   r,   r-   rd   r   r   r   r   	ArgJoiner   s    ri   z,%(function)s(%(expressions)s RETURNING CLOB))
arg_joinerr   r(   )r   r   r   r   ri   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   rk      rY   rk   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   rn      s    rn   N)r.   	django.dbr   django.db.models.expressionsr   r   django.db.models.fields.jsonr   django.utils.regex_helperr   r   r1   rI   rR   rZ   rk   rn   r   r   r   r   <module>   s    ?!(