Steven Punte wrote:
> In the cocoon environment, XSP provides a great
> way of address problems that don't fit into
> the paradigm of an existing generator.
>
> However, XSP can only be used at the first
> step in a pipeline.
>
> I find myself writing lots of custom transformers
> to address issues that don't fit into any
> of the existing standard generators.
>
> Would there be a way to write an XSP Transformer?
> How about we call this "XST" for now. Some of
> it's characteristics would be:
I had started myself to write such a Transformer, but then I just didn't
have enough energy and motivation to continue.
If you want, I can give you some sugestions:
> o A conventional transformer class would exits.
XSTTransformer, from which all XSTTransformers extend.
> o In a pipeline, one would specify the above
> transformer and a particular xst file.
Ok.
> o The xst file would be compile automatically
> when needed.
Ok. There is a system in Cocoon that can make you do this, look in the
sourcecode.
> o A basic internal design would simply allow
> hooks to the various SAX events (i.e. start and
> end of element and document).
> o Perhaps a more a more interesting internal
> model would come with a stack to facilitate
> more complex processing.
I wrote this thing but it was complicated to debug, since there were no
tools at that time to make code easier.
If I would do it now, I would look at Jakarta Commons Digester, which
has an XML descriptor that specifies what to do for certain conditions
and can be used to do just that.
> o Output events could be nicely written as in xsp
> like "<yada><xst:expr>string</xst:expr></yada>"
Each output could simply be a call to am XSP Generator that does not
close the Document.
--
Nicola Ken Barozzi [EMAIL PROTECTED]
- verba volant, scripta manent -
(discussions get forgotten, just code remains)
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