hey shawn,
I was looking into different ways of stripping extra
"\r\n" from the final output. I thought of a way,
which is definitely non-compliant, but as an exercise
I thought I'd post it. I don't actually plan on
implementing it, but it might generate discussion
about how JSTL 2.0 spec might handle this.
>From my understanding, <c:choose> & <x:choose> both do
not push out.write() to bodyContent. <c:set> on the
other does set out = bodycontent when needed. Example
from Jasper2 generated source below:
javax.servlet.jsp.tagext.BodyContent _bc =
pageContext.pushBody();
_bc.clear();
out = _bc;
Therefore if one were to modify <c:when> and <x:when>
to strip out extra line feeds, the output would have
to pushBody in order to call .trim() within the tag.
There are several issues I can see with this method of
handling unwanted whitespace & control line feed.
1. doesn't solve the real problem
2. it really should be addressed in JSP specification,
not JSTL specification
3. it's better to not have dozens of extra
out.write("\r\n"); litering the compiled jsp class.
4. There should be a way to easily plug in filters for
JSP page compilation. In the same way the latest
servlet spec defines request filters, page compilation
should have filters.
5. leaving the extra out.write() makes pages with lots
of tag (100+) less scalable as seen with jasper1 on
tomcat 4.0.3 and 3.3.x.
6. even though jasper2 now breaks tags without
scriplet code into it's own method, pages that use
both tag and scriplets will run into the 64K per
method limitation in java.
Even though some servlet containers uses jasper, and
likely jasper2 once it is released, leaving in
unwanted whitespace and control line feed make tag
pages less portable across different servlet
containers. There's no gaurantee a server will compile
pages the way jasper2 does it. Of course there is
always the option of writing a deployment tool that
parses the JSP to a temp directory stripping out
unwanted stuff and compile it to the server's working
directory.
peter
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