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The filter, simple_tag, and inclusion_tag methods provide a convenient way to register callables as tags. c C s i | _ i | _d S �N)�filters�tags)�selfr r r �__init__ s zLibrary.__init__Nc sx � d u r |d u r �j S � d ur%|d u r%t� �r �� � �S � �fdd�}|S � d ur4|d ur4|�j� < |S td� |f ��)Nc s �� � | �S r )�tag��func��namer r r �dec& s zLibrary.tag.<locals>.decz.Unsupported arguments to Library.tag: (%r, %r))� tag_function�callabler � ValueError)r r �compile_functionr r r r r s ��z Library.tagc C s || j |j< |S r )r r )r r r r r r 4 s zLibrary.tag_functionc s� �du r|du r� �fdd�}|S �dur0|du r0t ��r&�j�fi � ��S � ��fdd�}|S �dur]|dur]|�j�< dD ]}|� v rW� | }t|||� tt|�||� q?�|_|S td�|f ��)z� Register a callable as a template filter. Example: @register.filter def lower(value): return value.lower() Nc s �j | fi � ��S r )�filter_functionr )�flagsr r r r B s zLibrary.filter.<locals>.decc s �j �| fi � ��S r )�filterr �r$ r r r r r L s )�expects_localtime�is_safe�needs_autoescapez1Unsupported arguments to Library.filter: (%r, %r))r r# r �setattrr � _filter_namer! )r r � filter_funcr$ r �attr�valuer r& r r% 8 s. ���zLibrary.filterc K s | j |j|fi |��S r )r% r )r r r$ r r r r# c s zLibrary.filter_functionc s4 � ��fdd�}|du r|S t |�r||�S td��)z� Register a callable as a compiled template tag. Example: @register.simple_tag def hello(*args, **kwargs): return 'world' c sX t t���\���� ��}�p�j�t��� ������ ��f dd��}� ��|� �S )Nc sn |� � dd � }d }t|�dkr |d dkr |d }|d d� }t| |���� ����� \}}t��|||�S )Nr � ����as���)�split_contents�len� parse_bits� SimpleNode)�parser�token�bits� target_var�args�kwargs) �defaultsr � function_name�kwonly�kwonly_defaults�params� takes_context�varargs�varkwr r � compile_func{ s$ � z5Library.simple_tag.<locals>.dec.<locals>.compile_func�r r r r r �r �_rE �r r rB �r= r r> r? r@ rA rC rD r r o s � z Library.simple_tag.<locals>.decNz(Invalid arguments provided to simple_tag)r r! )r r rB r r r rI r � simple_tagf s $zLibrary.simple_tagc s � ���fdd�}|S )z� Register a callable as an inclusion tag: @register.inclusion_tag('results.html') def show_results(poll): choices = poll.choice_set.all() return {'choices': choices} c sZ t t���\���� ��}� p�j�t��� ������� ��f dd��}� ��|� �S )Nc s> |� � dd � }t| |��� � ����� \}}t��||��S )Nr )r3 r5 � InclusionNode)r7 r8 r9 r; r< ) r= �filenamer r> r? r@ rA rB rC rD r r rE � s( � �z8Library.inclusion_tag.<locals>.dec.<locals>.compile_funcrF rG �rM r r rB rJ r r � s � z"Library.inclusion_tag.<locals>.decr )r rM r rB r r r rN r � inclusion_tag� s &zLibrary.inclusion_tag)NN)NNN) r r r �__doc__r r r r% r# rK rO r r r r r s + 6r c @ s e Zd ZdZdd� Zdd� ZdS )� TagHelperNodez� Base class for tag helper nodes such as SimpleNode and InclusionNode. Manages the positional and keyword arguments to be passed to the decorated function. c C s || _ || _|| _|| _d S r )r rB r; r< )r r rB r; r< r r r r � s zTagHelperNode.__init__c sD � fdd�| j D �}| jr� g| }� fdd�| j�� D �}||fS )Nc s g | ]}|� � ��qS r ��resolve)�.0�var��contextr r � <listcomp>� s z8TagHelperNode.get_resolved_arguments.<locals>.<listcomp>c s i | ] \}}||� � ��qS r rR )rT �k�vrV r r � <dictcomp>� s z8TagHelperNode.get_resolved_arguments.<locals>.<dictcomp>)r; rB r< �items)r rW � resolved_args�resolved_kwargsr rV r �get_resolved_arguments� s z$TagHelperNode.get_resolved_argumentsN)r r r rP r r_ r r r r rQ � s rQ c s( e Zd ZdZ� fdd�Zdd� Z� ZS )r6 r c � t � �||||� || _d S r )�superr r: )r r rB r; r< r: �� __class__r r r � � zSimpleNode.__init__c C sH | � |�\}}| j|i |��}| jd ur||| j< dS |jr"t|�}|S )N� )r_ r r: � autoescaper )r rW r] r^ �outputr r r �render� s zSimpleNode.render)r r r �child_nodelistsr rh � __classcell__r r rb r r6 � s r6 c s$ e Zd Z� fdd�Zdd� Z� ZS )rL c r` r )ra r rM )r r rB r; r< rM rb r r r � rd zInclusionNode.__init__c C s� | � |�\}}| j|i |��}|j�| �}|du rSt| jt�r#| j}n+tt| jdd�t�r2| jj}n t| jt �sFt | j�rF|jj � | j�}n|jj � | j�}||j| < |�|�}|�d�}|dure||d< |�|�S )z� Render the specified template and context. Cache the template object in render_context to avoid reparsing and loading when used in a for loop. N�template� csrf_token)r_ r �render_context�get� isinstancerM r �getattrrk �strr �engine�select_template� get_template�newrh )r rW r] r^ �_dict�t� new_contextrl r r r rh � s" zInclusionNode.render)r r r r rh rj r r rb r rL � s rL c s� |r|r|d dkr|dd� }nt d| ��g } i } t|�} � fdd�|D �} |D ]t}t|g| �}|rt|�� \}}||vrN||vrN|du rNt d| |f ��|| v rZt d | |f ��|| t|�< || v rj| �|� q*|| v rs| �|� q*| r|t d | ��| �| �|�� z| �d� W q* t y� |du r�t d | ��Y q*w |dur�| dt |� � } | s�| r�t d | d � dd� | | D ��f ��| | fS )z� Parse bits for template tag helpers simple_tag and inclusion_tag, in particular by detecting syntax errors and by extracting positional and keyword arguments. r rW r NzW'%s' is decorated with takes_context=True so it must have a first argument of 'context'c s g | ] }� r |� vr|�qS r r )rT �kwarg�r@ r r rX 5 s �z parse_bits.<locals>.<listcomp>z.'%s' received unexpected keyword argument '%s'z7'%s' received multiple values for keyword argument '%s'zH'%s' received some positional argument(s) after some keyword argument(s)z+'%s' received too many positional argumentsz5'%s' did not receive value(s) for the argument(s): %sz, c s s � | ]}d | V qdS )z'%s'Nr )rT �pr r r � <genexpr>l s � z parse_bits.<locals>.<genexpr>) r �listr �popitemrq �remove�append�compile_filter�pop� IndexErrorr4 �join)r7 r9 rA rC rD r= r? r@ rB r r; r< �unhandled_params�unhandled_kwargs�bitry �paramr. r rz r r5 sv �� � ��� ��� �����r5 c C sZ zt | �}W n ty } ztd| |f ��d}~ww z|jW S ty, td| ��w )z; Load a Library object from a template tag module. zSInvalid template library specified. ImportError raised when trying to load '%s': %sNz4Module %s does not have a variable named 'register')r � ImportErrorr �register�AttributeError)r �module�er r r �import_libraryq s" ���� ��r� N)� functoolsr � importlibr �inspectr r �django.utils.htmlr �django.utils.itercompatr �baser r r � exceptionsr � Exceptionr r rQ r6 rL r5 r� r r r r �<module> s @# X
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