bug#6286: General delimited literals in ruby-mode patch

[Dmitry Gutov]

Hi Stefan,

Thanks for the answers.

On 24.04.2012 19:43, Stefan Monnier wrote:
> The maintainership is sadly unclear, indeed.  If someone could try to
> bring the two versions closer (and keep them in sync) that would be very
> appreciated.  Maybe it is enough to bring changes from the Ruby code to
> the Emacs code and not the other way around, but only if there's a clear
> understanding that the Ruby version is "deprecated" and won't see new
> development.  Also, I'm not sure the Emacs version includes all the
> functionality of the current Ruby code, so there's some work to do.

They seem to have a ticket for this, but the comments are all in 
Japanese: http://bugs.ruby-lang.org/issues/5142
And Babelfish doesn't help much.
If nobody beats me to it, I'm going to ask on the mailing list later.

> > This ruby-mode is not compatible with Emacs 23 either way.
>
> That might be: I have not verified that it is indeed
> backward compatible, I just tried to avoid consciously
> introducing incompatibilities.

To be precise, when you load it in 23.3, it complains about prog-mode's 
function definition being void.

I guess that means we don't need to worry about maintaining the "else" 
branch when implementing something that requires `syntax-propertize-rules'?

> > -                       (or (not (eq ?/ c))
> > -                           (null (nth 0 (ruby-parse-region (or begin 
> > parse-start) (point)))))
> > +                       ;; not a regexp or general delimited literal
> > +                       (null (nth 0 (ruby-parse-region (or begin parse-start) 
> > (point))))
>
> Could you explain this part of your patch?

That's a fix for indentation after percent literals delimited with 
operator characters: %r-abc-. But you seem to have already worked that out.

> BTW, is it really true that "%Q(hello (my) world)" is correct?
> That web-page doesn't clearly mention such nesting.

Yes, it seems to be one of the more obscure features:

irb(main):002:0> %Q(hello [(my]) world)
=> "hello [(my]) world"

It's mentioned here: http://phrogz.net/programmingruby/language.html

(to be continued)

-- Dmitry