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Message from discussion pyTenjin Feature Requests
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Steve  
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 More options Jun 6 2009, 11:39 am
From: Steve <unetright.thebas...@xoxy.net>
Date: Sat, 6 Jun 2009 08:39:52 -0700 (PDT)
Local: Sat, Jun 6 2009 11:39 am
Subject: Re: pyTenjin Feature Requests
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I forgot to mention two small modifications that I used:

> > How to create your own Template class and convert "@var"
> > into "_context.get('var', None)" automatically?
> >    def _expand(code):
> >        """expand '@var' into '_context.get("var", None)'"""
> >        return re.sub(r"@(\w+)", r"_context.get('\1', None)", code)

> >    class MyTemplate(tenjin.Template):

> >        def add_stmt(self, buf, code):
> >            tenjin.Template.add_stmt(self, buf, _expand(code))

> >        def add_expr(self, buf, code, flag_escape=None):
> >            tenjin.Template.add_expr(self, buf, _expand(code), flag_escape)
> >    <p>Hello #{@user or 'guest'}!<p>
> >    <?py if @message: ?>
> >    <p>#{@message}</p>

I actually used this instead:

_expand_match = re.compile(r'@(\w+)')
def _expand(code):
    """expand '@var' into '_context.get("var", '')'"""
    return _expand_match.sub(r"_context.get('\1', '')", code)

The first difference is that the match pattern is compiled once
instead of on every invocation.  The second difference is that when
the context key isn't found, I return the emptry string '' instead of
None.  This is a little less efficient for boolean evaluation but it
makes <p>#{@message}</p> work cleaner when message doesn't exist.

Thanks,
Steve


 
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