GNU bug report logs - #64739
(forward-thing 'number) doesn't work with decimal numbers

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Message #38 received at 64739 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Joseph Turner <joseph <at> breatheoutbreathe.in>,
 Stefan Monnier <monnier <at> iro.umontreal.ca>
Cc: 64739 <at> debbugs.gnu.org, winkler <at> gnu.org
Subject: Re: bug#64739: (forward-thing 'number) doesn't work with decimal
 numbers
Date: Mon, 24 Jul 2023 14:25:48 +0300

> From: Joseph Turner <joseph <at> breatheoutbreathe.in>
> Cc: winkler <at> gnu.org, 64739 <at> debbugs.gnu.org
> Date: Sun, 23 Jul 2023 12:03:50 -0700
> 
> 
> Eli Zaretskii <eliz <at> gnu.org> writes:
> 
> > That's probably one idea, yes.  (But note that those regexps don't
> > support numbers like "1.0e2".)
> 
> I agree that the regexp solution is not ideal.
> 
> > Another idea is to define a special-purpose syntax table and use that
> > with forward-word.
> 
> Did you have something like this in mind?

More or less.  TBH, I didn't think about this too much, so maybe this
idea doesn't "hold water".

> > Yet another idea is to use 'read', since the Lisp reader already knows
> > how to read numbers.
> 
> Sounds interesting! I'm not sure how to approach a solution like that.
> How would you let the Lisp reader know where to start and stop reading?

Start is easy: 'read' always starts at point.  End might give us
trouble, but in general 'read' reads one expression, so it should stop
at the end of the number, no?

Anyway, I was just brain-storming.  A real solution will need more
thought and more testing.  Perhaps Stefan (CC'ed) has some ideas or
inputs.

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