Re: Writing tags "the hard way" in 2.2...

Hi,

we have the scenario where we have a tag that displays only when a
certain exception happens.  It would then display stuff about the
exception.  But if the exception did not happen the tag's insides break
since the "exception == None" in that case, and the insides of the tag
is not meant to be rendered in that case...

So its not about side effects...

Still not a big deal, just an irritation which would be nice to be able
to fix.

-i

On Thu, 2007-03-08 at 06:09 -0800, Jonathan Ellis wrote:
> That's true, but it's not a big deal unless you're using [[= ]] with
> expressions that have side effects besides their output, which is a Bad
> Idea anyway.
> 
> On Thu, 08 Mar 2007 14:03:47 +0200, "Iwan Vosloo" <[email protected]> said:
> > Hi Jonathan,
> > 
> > mmm, thanks, that sortof works - only problem is that if you have a tag
> > such as:
> > 
> >  <mytag> [[= some python expression ]] </mytag>
> > 
> > The python expression will always be evaluated, whether the tag should
> > be displayed or not...  Any ideas how one can stop that from happening?
> > 
> > (The problem is that the expression may break in the cases when mytag
> > should not be displayed.)
> > 
> > -i
> > 
> > On Wed, 2007-03-07 at 07:03 -0800, Jonathan Ellis wrote:
> > > yes, this was removed.
> > > 
> > > you can easily do the same thing with an instance var yourself, though.
> > > 
> > > def body(self):
> > >   if not self.conditional: return
> > >   ...
> > > 
> > > On Wed, 07 Mar 2007 16:00:20 +0200, "Iwan Vosloo" <[email protected]> said:
> > > > Hi,
> > > > 
> > > > we suspect another change in 2.2:
> > > > 
> > > > We used to be able to write a tag (something inheriting from
> > > > spyceTagPlus), and set conditional=True on it.  If I understand
> > > > correctly, if you then return None from your begin(), its body will NOT
> > > > be output.
> > > > 
> > > > It seems this does not work the same in 2.2?
> > > > 
> > > > Thanks
> > > > -i
> > > > 
> > > > 
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