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Message from discussion pyTenjin Feature Requests
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makoto kuwata  
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 More options Jun 5 2009, 11:33 pm
From: makoto kuwata <kwa...@gmail.com>
Date: Fri, 5 Jun 2009 20:33:01 -0700 (PDT)
Local: Fri, Jun 5 2009 11:33 pm
Subject: Re: pyTenjin Feature Requests
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Hi Steve, thank you for trying pyTenjin.

On 2009-06-06 3:37, Steve <unetright.thebas...@xoxy.net> wrote:

> The indentation levels of the <?py ?> statements are mandatory to be
> separate from my indentation of the html content.  Instead, I would
> like to be able to use whatever indentation is appropriate for the
> html as long as it is constant between <?py ?> statements.  For
> example:

> <body>
>     <div>
>         <p>
>             <?py if boolean: ?>
>                 some conditional text
>             <?py #endif ?>
>         </p>
>     </div>
> </body>

What I can do is to extend Template class to add dummy 'if' statement.

main.py:

    import tenjin
    from tenjin.helpers import *

    class MyTemplate(tenjin.Template):

        def convert(self, input, filename=None):
            self._is_first_stmt = True
            return tenjin.Template.convert(self, input, filename)

        def add_stmt(self, buf, code):
            if self._is_first_stmt:
                if buf and buf[-1] != "\n" and buf[-1].isspace():
                    indent = buf.pop()
                    tenjin.Template.add_stmt(self, buf, "if True: ##
dummy\n")
                    buf.append(indent)
                self._is_first_stmt = False
            tenjin.Template.add_stmt(self, buf, code)

    print(MyTemplate('ex.pyhtml').script)
    #tenjin.Engine.templateclass = MyTemplate
    #engine = tenjin.Engine()
    #print engine.get_template('ex.pyhtml').script

ex.pyhtml:

    <html>
      <body>
        <ul>
          <?py if items: ?>
          <?py   for item in items: ?>
          <li>#{item}</li>
          <?py   #endfor ?>
          <?py #endif ?>
        </ul>
      </body>
    </html>

result:

    $ python main.py
    _buf.extend(('''<html>
      <body>
        <ul>\n''', ));
    if True: ## dummy
          if items:
            for item in items:
                _buf.extend(('''      <li>''', to_str(item), '''</li>
\n''', ));
            #endfor
          #endif
          _buf.extend(('''    </ul>
      </body>
    </html>\n''', ));

This hack will work well, but notice that it changes line number
of converted script, so you will get '+1' line number when you
have error reported.

> Another problem I have is that my django templates get pre-processed
> with an html compressor which strips out redundant whitespace.  Since
> I indent my html liberally and use 4 spaces per indentation, there is
> a 30% reduction with this processing.  Yes I do know this is minimized
> with html gzip transfer encoding.  Howerver some browsers ( *cough* IE
> *cough* ) have caching and etag bugs with respect to gzip'd content.

'30% reduction' is very impressive.
Hmm, it is difficult for Tenjin to strip spaces automatically and
correctly.
I don't have a good solution for this issue, but I'll try to think it.

--
regards,
makoto kuwata


 
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