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jinja2.ext
~~~~~~~~~~
Jinja extensions allow to add custom tags similar to the way django custom
tags work. By default two example extensions exist: an i18n and a cache
extension.
:copyright: (c) 2010 by the Jinja Team.
:license: BSD.
iÿÿÿÿ( t nodes( t BLOCK_START_STRINGt BLOCK_END_STRINGt VARIABLE_START_STRINGt VARIABLE_END_STRINGt COMMENT_START_STRINGt COMMENT_END_STRINGt LINE_STATEMENT_PREFIXt LINE_COMMENT_PREFIXt TRIM_BLOCKSt NEWLINE_SEQUENCEt KEEP_TRAILING_NEWLINEt
LSTRIP_BLOCKS( t Environment( t concat( t TemplateAssertionErrort TemplateSyntaxError( t contextfunctiont
import_stringt Markup( t nextt with_metaclasst string_typest iteritemst _t gettextt ngettextt ExtensionRegistryc B s e Z d Z d „ Z RS( s) Gives the extension an unique identifier.c C s3 t j | | | | ƒ } | j d | j | _ | S( Nt .( t typet __new__t
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identifier( t clst namet basest dt rv( ( s. /usr/lib/python2.7/site-packages/jinja2/ext.pyR # s ( R R t __doc__R ( ( ( s. /usr/lib/python2.7/site-packages/jinja2/ext.pyR s t Extensionc B sq e Z d Z e ƒ Z d Z d „ Z d „ Z d d „ Z d „ Z
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sg Extensions can be used to add extra functionality to the Jinja template
system at the parser level. Custom extensions are bound to an environment
but may not store environment specific data on `self`. The reason for
this is that an extension can be bound to another environment (for
overlays) by creating a copy and reassigning the `environment` attribute.
As extensions are created by the environment they cannot accept any
arguments for configuration. One may want to work around that by using
a factory function, but that is not possible as extensions are identified
by their import name. The correct way to configure the extension is
storing the configuration values on the environment. Because this way the
environment ends up acting as central configuration storage the
attributes may clash which is why extensions have to ensure that the names
they choose for configuration are not too generic. ``prefix`` for example
is a terrible name, ``fragment_cache_prefix`` on the other hand is a good
name as includes the name of the extension (fragment cache).
id c C s
| | _ d S( N( t environment( t selfR) ( ( s. /usr/lib/python2.7/site-packages/jinja2/ext.pyt __init__F s c C s2 t j | j ƒ } | j j | j ƒ | | _ | S( s= Create a copy of this extension bound to another environment.( t objectR t __class__t __dict__t updateR) ( R* R) R& ( ( s. /usr/lib/python2.7/site-packages/jinja2/ext.pyt bindI s c C s | S( sÁ This method is called before the actual lexing and can be used to
preprocess the source. The `filename` is optional. The return value
must be the preprocessed source.
( ( R* t sourceR# t filename( ( s. /usr/lib/python2.7/site-packages/jinja2/ext.pyt
preprocessP s c C s | S( s¹ It's passed a :class:`~jinja2.lexer.TokenStream` that can be used
to filter tokens returned. This method has to return an iterable of
:class:`~jinja2.lexer.Token`\s, but it doesn't have to return a
:class:`~jinja2.lexer.TokenStream`.
In the `ext` folder of the Jinja2 source distribution there is a file
called `inlinegettext.py` which implements a filter that utilizes this
method.
( ( R* t stream( ( s. /usr/lib/python2.7/site-packages/jinja2/ext.pyt
filter_streamW s
c C s
t ƒ ‚ d S( s If any of the :attr:`tags` matched this method is called with the
parser as first argument. The token the parser stream is pointing at
is the name token that matched. This method has to return one or a
list of multiple nodes.
N( t NotImplementedError( R* t parser( ( s. /usr/lib/python2.7/site-packages/jinja2/ext.pyt parsec s c C s t j | j | d | ƒS( sÓ Return an attribute node for the current extension. This is useful
to pass constants on extensions to generated template code.
::
self.attr('_my_attribute', lineno=lineno)
t lineno( R t ExtensionAttributeR! ( R* R# R9 ( ( s. /usr/lib/python2.7/site-packages/jinja2/ext.pyt attrk s c C sX | d k r g } n | d k r* g } n t j | j | d | ƒ| | | | d | ƒS( ss Call a method of the extension. This is a shortcut for
:meth:`attr` + :class:`jinja2.nodes.Call`.
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e d „ Z d „ Z
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ƒ d S( NR t install_gettext_translationst install_null_translationst install_gettext_callablest uninstall_gettext_translationst extract_translationst newstyle_gettext( R( R+ RI t globalst extendt _installt
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c C sk t | d d ƒ } | d k r* | j } n t | d d ƒ } | d k rT | j } n | j | | | ƒ d S( Nt ugettextt ungettext( t getattrR< R R Rb ( R* t translationst newstyleR R ( ( s. /usr/lib/python2.7/site-packages/jinja2/ext.pyR` ³ s c C s | j d „ d „ | ƒ d S( Nc S s | S( N( ( t x( ( s. /usr/lib/python2.7/site-packages/jinja2/ext.pyt ¾ s c S s | d k r | f p | f d S( Ni i ( ( t st pt n( ( s. /usr/lib/python2.7/site-packages/jinja2/ext.pyRl ¿ s ( Rb ( R* Rj ( ( s. /usr/lib/python2.7/site-packages/jinja2/ext.pyRa ¼ s c C sb | d k r | | j _ n | j j rB t | ƒ } t | ƒ } n | j j j d | d | ƒ d S( NR R ( R< R) R] RO RU R^ R/ ( R* R R Rj ( ( s. /usr/lib/python2.7/site-packages/jinja2/ext.pyRb à s c C s+ x$ d D] } | j j j | d ƒ q Wd S( NR R ( s gettexts ngettext( R) R^ t popR< ( R* Ri t key( ( s. /usr/lib/python2.7/site-packages/jinja2/ext.pyRc Î s
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isinstanceR R) R8 t extract_from_ast( R* R1 t gettext_functions( ( s. /usr/lib/python2.7/site-packages/jinja2/ext.pyRd Ò s c C s t | j ƒ j } t } d } d } i } x^| j j j d k rŠ| r[ | j j d ƒ n | j j d ƒ rq Pn | j j d ƒ } | j | k rµ | j
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j ƒ rot
j d d ƒ } | | | j >> from jinja2 import Environment
>>> env = Environment()
>>> node = env.parse('{{ (_("foo"), _(), ngettext("foo", "bar", 42)) }}')
>>> list(extract_from_ast(node))
[(1, '_', 'foo'), (1, '_', ()), (1, 'ngettext', ('foo', 'bar', None))]
>>> list(extract_from_ast(node, babel_style=False))
[(1, '_', ('foo',)), (1, 'ngettext', ('foo', 'bar'))]
For every string found this function yields a ``(lineno, function,
message)`` tuple, where:
* ``lineno`` is the number of the line on which the string was found,
* ``function`` is the name of the ``gettext`` function used (if the
string was extracted from embedded Python code), and
* ``message`` is the string itself (a ``unicode`` object, or a tuple
of ``unicode`` objects for functions with multiple string arguments).
This extraction function operates on the AST and is because of that unable
to extract any comments. For comment support you have to use the babel
extraction interface or extract comments yourself.
c s s! | ] } | d k r | Vq d S( N( R< ( t .0Rk ( ( s. /usr/lib/python2.7/site-packages/jinja2/ext.pys ù s i i N( t find_allR R= Rr R• Rƒ R# R> R R€ R R› R< R? R@ RA t tuplet lenR9 ( R• Rt t babel_stylet stringst arg( ( s. /usr/lib/python2.7/site-packages/jinja2/ext.pyRs À s0 $
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find comments for gettext calls forwards. Once the comment
from line 4 is found, a comment for line 1 will not return a
usable value.
c C s( | | _ | | _ d | _ d | _ d S( Ni ( t tokenst comment_tagst offsett last_lineno( R* RÊ RË ( ( s. /usr/lib/python2.7/site-packages/jinja2/ext.pyR+ s c C s¤ z“ xˆ t | j | j | !ƒ D]m \ } } } | d k r y | j d d ƒ \ } } Wn t k
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find_comments s , ( R R R' R+ R× RÛ ( ( ( s. /usr/lib/python2.7/site-packages/jinja2/ext.pyRÉ s c c s@ t ƒ } xN | j d d ƒ j d ƒ D]1 } | j ƒ } | sC q% n | j t | ƒ ƒ q% Wt | k rv | j t ƒ n t d „ } | | d t ƒ } t | j d t
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j! | ƒ f VqWd S( s Babel extraction method for Jinja templates.
.. versionchanged:: 2.3
Basic support for translation comments was added. If `comment_tags`
is now set to a list of keywords for extraction, the extractor will
try to find the best preceeding comment that begins with one of the
keywords. For best results, make sure to not have more than one
gettext call in one line of code and the matching comment in the
same line or the line before.
.. versionchanged:: 2.5.1
The `newstyle_gettext` flag can be set to `True` to enable newstyle
gettext calls.
.. versionchanged:: 2.7
A `silent` option can now be provided. If set to `False` template
syntax errors are propagated instead of being ignored.
:param fileobj: the file-like object the messages should be extracted from
:param keywords: a list of keywords (i.e. function names) that should be
recognized as translation functions
:param comment_tags: a list of translator tags to search for and include
in the results.
:param options: a dictionary of additional options (optional)
:return: an iterator over ``(lineno, funcname, message, comments)`` tuples.
(comments will be empty currently)
t
extensionst t ,c S s" | j | t | ƒ ƒ j ƒ d k S( Nt 1t ont yest true( Rß Rà s yesRâ ( t gett strt lower( RÁ Rq t default( ( s. /usr/lib/python2.7/site-packages/jinja2/ext.pyt getboolN s t silentt block_start_stringt block_end_stringt variable_start_stringt variable_end_stringt comment_start_stringt comment_end_stringt line_statement_prefixt line_comment_prefixt trim_blockst
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