U
    Ha                     @   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                       sT   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	 fddZ
  ZS )Castz)Coerce an expression to a new field type.ZCASTz,%(function)s(%(expressions)s AS %(db_type)s)c                    s   t  j||d d S )N)output_field)super__init__)self
expressionr   	__class__ I/tmp/pip-unpacked-wheel-3jxiddxt/django/db/models/functions/comparison.pyr
      s    zCast.__init__c                    s"   | j ||d< t j||f|S )Ndb_type)r   Zcast_db_typer	   as_sqlr   compiler
connectionextra_contextr   r   r   r      s    zCast.as_sqlc           	         s   | j |}|dkrZd}t j||fd|i|\}}|dkrBdnd}|d| ||fS |dkrd	}t j||fd|i|S | j||f|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   Z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 )NZ
FloatFieldz(%(expressions)s + 0.0)r   z"JSON_EXTRACT(%(expressions)s, '$')r   )r   get_internal_typeZmysql_is_mariadbr   )r   r   r   r   r   output_typer   r   r   as_mysql"   s    
zCast.as_mysqlc                    s<   | j  dkr,d}t j||fd|i|S | j||f|S )Nr   z JSON_QUERY(%(expressions)s, '$')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"   __classcell__r   r   r   r   r      s   r   c                       s0   e Zd ZdZdZ fddZ fddZ  ZS )Coalescez:Return, from left to right, the first non-null expression.ZCOALESCEc                    s&   t |dk rtdt j|| d S )N   z+Coalesce must take at least two expressionslen
ValueErrorr	   r
   r   expressionsextrar   r   r   r
   9   s    zCoalesce.__init__c                    sT   | j  dkrD|  }|dd |  D  tt|j||f|S | j||f|S )NZ	TextFieldc                 S   s   g | ]}t |d dqS )ZTO_NCLOB)r'   )r   ).0r   r   r   r   
<listcomp>C   s    z&Coalesce.as_oracle.<locals>.<listcomp>)r   r   copyZset_source_expressionsget_source_expressionsr	   r)   r   )r   r   r   r   cloner   r   r   r"   >   s    
zCoalesce.as_oracle)r#   r$   r%   r&   r'   r
   r"   r(   r   r   r   r   r)   5   s   r)   c                       s8   e Zd ZdZdZedZ fddZ fddZ  Z	S )CollateZCOLLATEz*%(expressions)s %(function)s %(collation)sz	^[\w\-]+$c                    s2   |r| j |std| || _t | d S )NzInvalid collation name: %r.)collation_rematchr-   	collationr	   r
   )r   r   r9   r   r   r   r
   P   s    zCollate.__init__c                    s(   | d|j| j t j||f|S )Nr9   )
setdefaultopsZ
quote_namer9   r	   r   r   r   r   r   r   V   s    zCollate.as_sql)
r#   r$   r%   r'   r   r   r7   r
   r   r(   r   r   r   r   r6   J   s
   r6   c                       s0   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.
    ZGREATESTc                    s&   t |dk rtdt j|| d S )Nr*   z+Greatest must take at least two expressionsr+   r.   r   r   r   r
   e   s    zGreatest.__init__c                    s   t  j||fddi|S )zUse the MAX function on SQLite.r'   MAXr	   r   r   r   r   r   r   j   s    zGreatest.as_sqliter#   r$   r%   r&   r'   r
   r   r(   r   r   r   r   r<   [   s   r<   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 )

JSONObjectZJSON_OBJECTc                    s8   g }|  D ]\}}|t||f qt j|  d S )N)itemsextendr   r	   r
   )r   fieldsr/   keyvaluer   r   r   r
   s   s    zJSONObject.__init__c                    s"   |j jstdt j||f|S )Nz7JSONObject() is not supported on this database backend.)featuresZhas_json_object_functionr   r	   r   r   r   r   r   r   y   s
    zJSONObject.as_sqlc                 K   s   | j ||fddi|S )Nr'   ZJSONB_BUILD_OBJECTr   r   r   r   r   as_postgresql   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)r1   argr   r   r   r2      s     z@JSONObject.as_oracle.<locals>.ArgJoiner.join.<locals>.<listcomp>r*      z, )ziprI   )r   argsr   r   r   rI      s    (z,JSONObject.as_oracle.<locals>.ArgJoiner.joinN)r#   r$   r%   rI   r   r   r   r   	ArgJoiner   s   rN   z,%(function)s(%(expressions)s RETURNING CLOB))Z
arg_joinerr   rG   )r   r   r   r   rN   r   r   r   r"      s    zJSONObject.as_oracle)r#   r$   r%   r'   r   r   r
   r   rH   r"   r(   r   r   r   r   r@   o   s   r@   c                       s0   e Zd ZdZdZ fddZ fddZ  ZS )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.
    ZLEASTc                    s&   t |dk rtdt j|| d S )Nr*   z(Least must take at least two expressionsr+   r.   r   r   r   r
      s    zLeast.__init__c                    s   t  j||fddi|S )zUse the MIN function on SQLite.r'   ZMINr>   r   r   r   r   r      s    zLeast.as_sqliter?   r   r   r   r   rO      s   rO   c                       s$   e Zd ZdZdZ fddZ  ZS )NullIfZNULLIFr*   c                    s:   |   d }t|tr(|jd kr(tdt j||f|S )Nr   z2Oracle does not allow Value(None) for expression1.)r4   
isinstancer   rE   r-   r	   r   )r   r   r   r   Zexpression1r   r   r   r"      s    zNullIf.as_oracle)r#   r$   r%   r'   arityr"   r(   r   r   r   r   rP      s   rP   N)r&   Z	django.dbr   Zdjango.db.models.expressionsr   r   Zdjango.db.models.fields.jsonr   Zdjango.utils.regex_helperr   r   r)   r6   r<   r@   rO   rP   r   r   r   r   <module>   s   -(