Re: [xslt] data callbacks?

[Paul Miller <paul fxtech com>]

Robert Koberg wrote:
> On Oct 21, 2008, at 11:37 AM, Paul Miller wrote:
>
> > Just came across libxslt and it's brilliant (and fast!). I was 
> > thinking about embedding it into an app as a report generator and I 
> > think what I want to do is possible, but I wanted to double-check here 
> > first.
> >
> > I'd like to write some XML that describes a report - basic layout 
> > information plus what columns/rows of data to output. But there is no 
> > actual data in this XML - the data needs to be generated on the fly 
> > within my application. I'd like to stick some custom elements or 
> > attributes that cause libxslt to call back into my application using a 
> > callback function and replace that element with possibly more elements 
> > with specific text nodes.
> >
> > For example, let's say I have an element like this:
> >
> >   <data id="income" range="5"/>
> >
> > In my template, I'd like to convert this to something like this in the 
> > resulting XML:
> >
> >   <data>100.00</data>
> >   <data>200.00</data>
> >   <data>300.00</data>
> >   <data>400.00</data>
> >   <data>500.00</data>
> >
> > So what I'd like to happen is for the xslt to see the "range" and "id" 
> > attributes and then call back into my code with information about this 
> > element. Then I'd like my code to replace this element with its own 
> > set of elements, filling in the data values as it goes.
> >
> > Is this possible? Is this a good idea? Any suggestions on what API to 
> > use to handle this?
>
>
> You could use the document function. Perhaps target a script like:
>
> <xsl:apply-templates
>   select="document(concat('path/to/script?id=', @id, '&amp;range=', 
> @range))"/>
>
> You would need to return a well-formed document (your data elems wrapped 
> in a root elem), I believe.

Okay, sounds doable. But can my "path/to/script" end up calling a 
registered callback function in my code? Note that I'm embedding libxslt 
in a stand-alone C/C++ application with an embedded web-kit renderer.

--
Paul Miller | paul fxtech com | www.fxtech.com | Got Tivo?