RE: Trying to get my head around Stylesheet Choosing & pipeline type stuff

[David Nolan]

--On Monday, June 21, 2004 12:54 PM +0100 Tom Howe <[EMAIL PROTECTED]> 
wrote:

I've tried a number of things but I'm still having difficulty defining a
pipeline outside of the PIs.
I looked at the example Stylechoosers and created one myself but since
they populate the $r->pnotes('preferred_style') I can only seem to be
able to define a single style. I tried putting an arrayref of style
names in there but it barfed. If I want to setup a chain of processors
without using the PIs is there a way of doing it?
I've never actually used a stylechooser myself, since I use a provider to 
provide my content.  It just returns a list of styles when asked for one.

But my reading of the documentation is that a given request can have one 
Style associated with it, then you do stuff based upon that in your 
httpd.conf.  So for example, say you have a 3 phase pipeline:

phase 1: only one choice, foo.xslt
phase 2: two options, bar.xslt and baz.xslt
phase 3: 4 options, 2 for each in the previous phase:
        bar-xyz.xslt bar-abc.xslt baz-xyz.xslt baz-abc.xslt
so you have four possible paths in the pipeline.  So you'll need 4 Style 
names, and four sections in your httpd.conf

AxAddProcessor text/xsl /stylesheets/foo.xslt
<AxStyleName bar-xyz>
 AxAddProcessor text/xsl /stylesheets/bar.xslt
 AxAddProcessor text/xsl /stylesheets/bar-xyz.xslt
</AxStyleName>
<AxStyleName bar-abc>
... etc...
Personally I prefer the provider approach.  I think you get more 
flexibility, and less redundant configuration.  For the above case, you 
would want something like:

sub get_styles {
 my $self = shift;
 my @styles;
 push @styles, {type => "text/xsl", href => "/stylesheets/foo.xslt"};
 if (<some test for bar vs baz here>) {
   push @styles, {type => "text/xsl", href => "/stylesheets/bar.xslt"};
   if (<some test for abc vs xyz here>) {
     push @styles, {type => "text/xsl", href => 
"/stylesheets/bar-abc.xslt"};
   } else {
     push @styles, {type => "text/xsl", href => 
"/stylesheets/bar-xyz.xslt"};
   }
 } else {
   push @styles, {type => "text/xsl", href => "/stylesheets/baz.xslt"};
   if (<some test for abc vs xyz here>) {
     push @styles, {type => "text/xsl", href => 
"/stylesheets/baz-abc.xslt"};
   } else {
     push @styles, {type => "text/xsl", href => 
"/stylesheets/baz-xyz.xslt"};
   }
 }

 return [EMAIL PROTECTED];
}
-David
David Nolan                    <*>                    [EMAIL PROTECTED]
curses: May you be forced to grep the termcap of an unclean yacc while
     a herd of rogue emacs fsck your troff and vgrind your pathalias!

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