GNU bug report logs - #401
bug in HTML or XML syntax highlighting code

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From: Stefan Monnier <monnier <at> iro.umontreal.ca>
To: Paul Pogonyshev <pogonyshev <at> gmx.net>
Cc: 401 <at> debbugs.gnu.org, bug-gnu-emacs <at> gnu.org
Subject: bug#401: bug in HTML or XML syntax highlighting code
Date: Sat, 14 Jun 2008 15:46:03 -0400

> With fairly recent SVN build of Emacs I have the pasted below HTML code
> highlighted wrongly.  Namely, "foo" is not highlighted as an attribute
> value, apparently because there are non-corresponding (from Emacs point
> of view) parentheses in <script>.

Indeed, part of the problem is that we use sgml-mode for this, even
though your file doesn't seem like a properly formed SGML file.  We need
to add special support for <script>.  Note that we do not properly
support SGML either, e.g. if you use a CDATA[[...]] construct you'll
bump into the same kinds of problems.

> It seems that HTML/XML mode uses two different ways to find syntactic
> context for indenting code and for syntax-highlighting it, which I

Most/all major modes do.  The syntax-highlighting is done "globally"
(especially the comment-vs-string-vs-code distinction), so it can get
seriously messed up over the whole buffer in case the buffer's syntax is
incorrect or is using constructs which the major mode doesn't
understand.  The indentation code usually can work much more locally, so
it tends to be more resilient.


        Stefan

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