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jinja2.runtime
~~~~~~~~~~~~~~
Runtime helpers.
:copyright: (c) 2017 by the Jinja Team.
:license: BSD.
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The template context supports read only dict operations (`get`,
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| j d S r� )r� r# r" r" r% r& � r' c C s | j tkr| �d�S | j S )Nzthere is no previous item)�_before�_first_iterationr� rD r" r" r% �previtem� s
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>>> foo + 42
Traceback (most recent call last):
...
jinja2.exceptions.UndefinedError: 'foo' is undefined
��_undefined_hint�_undefined_obj�_undefined_name�_undefined_exceptionNc C s || _ || _|| _|| _d S r! r� )r; �hint�objr@ �excr" r" r% r= e s zUndefined.__init__c O sl | j dkrX| jtkr d| j }q^t| jt�sBdt| j�| jf }q^dt| j�| jf }n| j }| �|��dS )z{Regular callback function for undefined objects that raises an
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��������������������rm c s` �dkr,ddl }|�t����|�tj�� �dkr8t��fdd�� G � ��fdd�d��}|S )ak Given a logger object this returns a new undefined class that will
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logger = logging.getLogger(__name__)
LoggingUndefined = make_logging_undefined(
logger=logger,
base=Undefined
)
.. versionadded:: 2.8
:param logger: the logger to use. If not provided, a default logger
is created.
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defaults to :class:`Undefined`.
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Traceback (most recent call last):
...
jinja2.exceptions.UndefinedError: 'foo' is undefined
r" c C s< | j d kr2| jtkr d| j S dt| j�| jf S d| j S )Nz{{ %s }}z {{ no such element: %s[%r] }}z!{{ undefined value printed: %s }})r� r� r r� r rD r" r" r% r�
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ZdS )�StrictUndefinedas An undefined that barks on print and iteration as well as boolean
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>>> foo = StrictUndefined(name='foo')
>>> str(foo)
Traceback (most recent call last):
...
jinja2.exceptions.UndefinedError: 'foo' is undefined
>>> not foo
Traceback (most recent call last):
...
jinja2.exceptions.UndefinedError: 'foo' is undefined
>>> foo + 42
Traceback (most recent call last):
...
jinja2.exceptions.UndefinedError: 'foo' is undefined
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