Re: html, css, and js modes working together

[Dmitry Gutov]

On 07.02.2017 05:40, Tom Tromey wrote:

> Dmitry> It indents fine. Now try replacing "4" with "4 < 5" and reindenting
> Dmitry> the "alert" line. It jumps to the right.
>
> I debugged this tonight.
>
> The problem here is that sgml-parse-tag-backward looks for "<" or ">"
> characters, but doesn't consider the syntax.  The appended patch fixes
> this test case.

It should work. But maybe another thing to try is avoid using 
sgml-get-context as the dispatch function for html-indent-line.

After all, html-syntax-propertize-function already knows how to find the 
limits of the hunks. The method may change, but hopefully you'd be able 
to reuse it. It could also leave a text property (or some overlays) 
which the indentation function can look up.

> My hope is that the html-syntax-propertize-function -- maybe not the one
> I wrote but one that's been fixed according to the various comments in
> this thread -- should suffice to fix all such problems in principle.

I think so. IME adding syntax-table property on such `<` and `>` works 
well enough. And the main issue to look out for is indentation of HTML 
tags following the tags with such rogue < and > inside.

> Something like this problem in sgml-parse-tag-backward doesn't
> invalidate the scheme; this is just a buglet.  What do you think?

I agree, at least as far as this specific combination of modes in 
concerned. Things get complicated when we try to combine arbitrary modes.