o
    ˷e                     @   sR   d Z ddlmZmZ G dd deZG dd dZG dd dZG d	d
 d
ZdS )z]
Useful auxiliary data structures for query construction. Not useful outside
the SQL domain.
    )INNERLOUTERc                   @   s   e Zd ZdZdd ZdS )	MultiJoinz
    Used by join construction code to indicate the point at which a
    multi-valued join was attempted (if the caller wants to treat that
    exceptionally).
    c                 C      || _ || _d S N)levelnames_with_path)self	names_pospath_with_names r   Z/var/www/ideatree/venv/lib/python3.10/site-packages/django/db/models/sql/datastructures.py__init__   s   
zMultiJoin.__init__N)__name__
__module____qualname____doc__r   r   r   r   r   r      s    r   c                   @   s   e Zd ZdS )EmptyN)r   r   r   r   r   r   r   r      s    r   c                   @   s`   e Zd ZdZ	dddZdd Zdd Zed	d
 Zdd Z	dd Z
dd Zdd Zdd ZdS )Joina  
    Used by sql.Query and sql.SQLCompiler to generate JOIN clauses into the
    FROM entry. For example, the SQL generated could be
        LEFT OUTER JOIN "sometable" T1
        ON ("othertable"."sometable_id" = "sometable"."id")

    This class is primarily used in Query.alias_map. All entries in alias_map
    must be Join compatible by providing the following attributes and methods:
        - table_name (string)
        - table_alias (possible alias for the table, can be None)
        - join_type (can be None for those entries that aren't joined from
          anything)
        - parent_alias (which table is this join's parent, can be None similarly
          to join_type)
        - as_sql()
        - relabeled_clone()
    Nc                 C   s8   || _ || _|| _|| _| | _|| _|| _|| _d S r   )	
table_nameparent_aliastable_alias	join_typeget_joining_columns	join_cols
join_fieldnullablefiltered_relation)r	   r   r   r   r   r   r   r   r   r   r   r   ,   s   

zJoin.__init__c              	   C   s$  g }g }|j }|jj}| jD ]\}}|d|| j|||| j||f  q| j| j| j}	|	rF|	|	\}
}|d|
  |
| | jr_|	| j\}
}|
r_|d|
  |
| |spt| jd| j}td|j d|}| j| jkr}dnd| j }d| j|| j||f }||fS )	z
        Generate the full
           LEFT OUTER JOIN sometable ON sometable.somecol = othertable.othercol, params
        clause for this join.
        z%s.%s = %s.%sz(%s)fieldzaJoin generated an empty ON clause. %s did not yield either joining columns or extra restrictions.z AND   %sz%s %s%s ON (%s))quote_name_unless_aliasops
quote_namer   appendr   r   r   get_extra_restrictioncompileextendr   getattr
ValueError	__class__joinr   r   )r	   compiler
connectionjoin_conditionsparamsqnqn2lhs_colrhs_col
extra_cond	extra_sqlextra_paramsdeclared_fieldon_clause_sql	alias_strsqlr   r   r   as_sqlF   sV   


zJoin.as_sqlc              	      sr     | j| j}  | j| j}| jd ur'| j } fdd| jjD |_nd }| j| j||| j| j	| j
|dS )Nc                    s   g | ]}  ||qS r   )get).0p
change_mapr   r   
<listcomp>   s    z(Join.relabeled_clone.<locals>.<listcomp>)r   )r<   r   r   r   clonepathr*   r   r   r   r   )r	   r@   new_parent_aliasnew_table_aliasr   r   r?   r   relabeled_clone~   s"   



zJoin.relabeled_clonec                 C   s   | j | j| j| j| jfS r   )r*   r   r   r   r   r	   r   r   r   identity   s   zJoin.identityc                 C      t |tstS | j|jkS r   )
isinstancer   NotImplementedrH   r	   otherr   r   r   __eq__      
zJoin.__eq__c                 C   
   t | jS r   hashrH   rG   r   r   r   __hash__      
zJoin.__hash__c                 C   s   | j d d |j d d kS )NrH   rL   r   r   r   equals   s   zJoin.equalsc                 C      |  i }t|_|S r   )rF   r   r   r	   newr   r   r   demote      
zJoin.demotec                 C   rX   r   )rF   r   r   rY   r   r   r   promote   r\   zJoin.promoter   )r   r   r   r   r   r;   rF   propertyrH   rN   rS   rW   r[   r]   r   r   r   r   r      s    
8
	r   c                   @   sX   e Zd ZdZdZdZdZdd Zdd Zdd Z	e
d	d
 Zdd Zdd Zdd ZdS )	BaseTablez
    The BaseTable class is used for base table references in FROM clause. For
    example, the SQL "foo" in
        SELECT * FROM "foo" WHERE somecond
    could be generated by this class.
    Nc                 C   r   r   )r   r   )r	   r   aliasr   r   r   r      s   
zBaseTable.__init__c                 C   s2   | j | jkrdnd| j  }|| j}|| g fS )Nr   r    )r   r   r!   )r	   r,   r-   r9   base_sqlr   r   r   r;      s   zBaseTable.as_sqlc                 C   s   |  | j|| j| jS r   )r*   r   r<   r   )r	   r@   r   r   r   rF      s   zBaseTable.relabeled_clonec                 C   s   | j | j| jfS r   )r*   r   r   rG   r   r   r   rH      s   zBaseTable.identityc                 C   rI   r   )rJ   r_   rK   rH   rL   r   r   r   rN      rO   zBaseTable.__eq__c                 C   rP   r   rQ   rG   r   r   r   rS      rT   zBaseTable.__hash__c                 C   s   | j |j kS r   rV   rL   r   r   r   rW      s   zBaseTable.equals)r   r   r   r   r   r   r   r   r;   rF   r^   rH   rN   rS   rW   r   r   r   r   r_      s    
r_   N)	r   django.db.models.sql.constantsr   r   	Exceptionr   r   r   r_   r   r   r   r   <module>   s     