bug#22241: 25.0.50; etags Ruby parser problems

[Eli Zaretskii <eliz@gnu.org>]

> Date: Sun, 24 Jan 2016 17:44:44 +0200
> From: Eli Zaretskii <eliz@gnu.org>
> Cc: 22241@debbugs.gnu.org
> 
> > Cc: 22241@debbugs.gnu.org
> > From: Dmitry Gutov <dgutov@yandex.ru>
> > Date: Sun, 24 Jan 2016 00:43:21 +0300
> > 
> > On 01/23/2016 11:48 PM, Eli Zaretskii wrote:
> > 
> > >> ^[ \t]([A-Z][a-z0-9_])[ \t]*=[ \t]*
> > 
> >                          ^ I missed a * there.
> > 
> > >> ? Then record the first group, and simply don't look at what's being
> > >> assigned.
> > >
> > > That's possible, but is it good enough?  Does the above regexp
> > > necessarily mean it's a constant?
> > 
> > I think so. The important point is that its name begins with a capital 
> > letter.
> > 
> > And we should probably recognize assignments like these:
> > 
> > ModuleExample::CONSTANT = 5
> > 
> > The qualified name "ModuleExample::CONSTANT" if at the top level, 
> > unqualified name is "CONSTANT". When inside classes, modules or methods, 
> > only record the unqualified name; maybe disregard these assignments when 
> > inside methods altogether.
> 
> OK, thanks.  I will see what I can do with this.

Please take a look at the results of commit 25b79d7 on the emacs-25
branch.  I think I implemented everything except the optional name
qualification.  I hope the results are good enough.  If you agree,
please close the bug.

Of course, if there are still bugs, or the implementation doesn't
catch some use cases, please show them.

Thanks.