Re: I dream of a velocity expression custom JSP tag

[Nathan Bubna <nb...@gmail.com>]

On 8/23/06, Jeff Schnitzer <je...@infohazard.org> wrote:
> Just catching up, it's a busy week before burning man :-)
>
> I think this is a marvelous idea.
>
> I actually started working on a JSTL-ish set of tags based on the Groovy
> expression language because AFAICT the Groovy expression language is a
> perfect superset of Velocity's.  The main reason, though, is that Groovy
> has a nice API that lets me evaluate expressions directly so it's easy.
>
> I'd be perfectly happy with VSTL instead of GSTL... it's just a question
> of a nice API for evaluating expressions.

I just noticed this:
http://jakarta.apache.org/commons/jexl/index.html

if you look at the javadocs, you can see it's not just
Velocity-inspired but is basically a fork of Velocity.  Not sure how
best this would fit into a VSTL idea, but it's certainly something we
need to look at.

> Jeff
>
>
> Will Glass-Husain wrote:
> > (And I thought I was being so clever about the Context idea).
> >
> > Another issue is that the emerging VSTL is useful for if's and set's
> > but shares JSTL's wordiness for straight output
> > (e.g. <c:out "${model.property}"/>  instead of just $model.property).
> >
> > But mixed in with veltag, you could easily render a block of Velocity
> > in the middle of a page.
> >
> > The more I think about it, the more I like this idea.  Be nice for
> > those of us who use JSP and Velocity all the time.   I'd think the
> > tasks to build this out into production-ready toolkit would be
> > something like this:
> >
> > * modify Velocity core to support evaluation of expressions
> > * create new VSTL tag library in part that parallels JSTL
> > * add in macro capability (?)
> > * merge in veltag (?)
> > * document, create examples, website, etc.
> >
> > This would be a nice sub-project of a future Velocity TLP.  :-)
> >
> > What do you think Jeff?  Is this feasible or have we hijacked your
> > idea into something new?
> >
> > WILL
>
>
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