JSP Checking

Is there any sort of extension for checkstyle that enable it to parse
and check JSP for similar types of standards?

For example:

Scriplets: enable/disable them. Check the java in the scriplets.
Regular expressions: It could point out the use of the slow "//" in
Xpath expressions.
Indentation: same as normal checkstyle
XHtml: Verify if the JSPs are xhtml compatible.
and many more...

If checkstyle can't do it... Is there any other tool that could be
used to implement those checks? I'm gonna use this at svn on the
pre-commit hook, I know I could use a regular-expressions checker, but
that is too limited and intrusive.

regards
Emerson

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