From: "Stefan Monnier" <monnier+gnu/emacs@rum.cs.yale.edu>
Cc: "Stefan Monnier" <monnier+gnu/emacs@rum.cs.yale.edu>,
rms@gnu.org, emacs-devel@gnu.org
Subject: Re: emacs and guile (Re: ehelp woes, or why I hate a module that I love so much)
Date: Fri, 19 Jul 2002 09:34:22 -0400 [thread overview]
Message-ID: <200207191334.g6JDYMe15622@rum.cs.yale.edu> (raw)
In-Reply-To: tx1k7nrvpu0.fsf@raeburn.org
> > Actually, this is a recent change, right ? In Emacs-21.2, `symbol-name'
> > always returns a string with no properties. In that case we should
> > probably also strip the properties when we create a new symbol, instead
> > of wasting those intervals.
>
> I don't know about 21.2, but it happens for me with:
> 21.1 - at work
Looks like I was wrong then. Sorry.
> Are you sure about 21.2? It would be odd for it to have been fixed
> there but not on the trunk. Here's the whole thing I'm doing to
> reproduce it in ielm:
>
> ELISP> (setq s "booga-booga")
> "booga-booga"
> ELISP> (put-text-property 3 6 'some-prop 'some-val s)
> nil
> ELISP> (setq s2 (intern s))
> booga-booga
> ELISP> (symbol-name 'booga-booga)
> #("booga-booga" 0 3 nil 3 6
> (some-prop some-val)
> 6 11 nil)
>
> I do think it makes sense for symbol-name's return value to have no
> text properties.
I agree, but I'm not sure it matters enough to change `intern's behavior.
> >> An Emacs Lisp symbol's name can also be changed after interning, such
> >> that it won't be found when interning either the old name or
> >> (probably) the new name.
> >
> > This is undocumented and I don't know of any code that relies on it
> > (well, I know of some such code, but not in any elisp package).
> > I think it should be considered as a misfeature/bug (but I don't
> > think it's worth fixing unless the fix is to make the output of
> > `symbol-name' be read-only).
>
> Maybe if we had read-only strings....
My Emacs' strings are (mostly) read-only (as are its `defconst' variables).
It does introduce some breakage, but the use of `aset' on strings is
surprisingly infrequent.
> > I'm pretty sure that Scheme's symbol-name (if such a function exists)
> > returns a brand new string.
>
> Which would be another difference -- retrieving the name twice would
> give two values not "eq?" while in Emacs Lisp they are "eq". So is
> *that* property something that anyone might rely on in their Lisp code?
I don't think I've ever seen code rely on it, but I like it from
a performance point of view.
Stefan
next prev parent reply other threads:[~2002-07-19 13:34 UTC|newest]
Thread overview: 56+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-06-25 14:50 ehelp woes, or why I hate a module that I love so much Juanma Barranquero
2002-06-25 15:06 ` D. Goel
2002-06-25 15:41 ` Juanma Barranquero
2002-06-26 22:24 ` Richard Stallman
2002-06-27 17:11 ` Juanma Barranquero
2002-06-27 19:57 ` Stefan Monnier
2002-07-02 15:02 ` Juanma Barranquero
2002-07-02 15:18 ` Stefan Monnier
2002-07-02 15:50 ` Juanma Barranquero
2002-06-29 8:41 ` Richard Stallman
2002-07-02 15:15 ` Juanma Barranquero
2002-07-02 15:49 ` Eli Zaretskii
2002-07-03 11:16 ` Juanma Barranquero
2002-07-03 20:57 ` Richard Stallman
2002-07-03 21:32 ` Simon Josefsson
2002-07-04 5:09 ` Eli Zaretskii
2002-07-04 7:58 ` Juanma Barranquero
2002-07-04 10:13 ` Eli Zaretskii
2002-07-04 11:52 ` Juanma Barranquero
2002-07-06 10:38 ` Eli Zaretskii
2002-07-04 11:02 ` Simon Josefsson
2002-07-04 12:08 ` Juanma Barranquero
2002-07-04 12:19 ` Miles Bader
2002-07-04 13:31 ` Juanma Barranquero
2002-07-04 14:02 ` Simon Josefsson
2002-07-04 14:00 ` Simon Josefsson
2002-07-04 15:20 ` Juanma Barranquero
2002-07-17 2:58 ` emacs and guile (Re: ehelp woes, or why I hate a module that I love so much) Ken Raeburn
2002-07-17 7:13 ` Juanma Barranquero
2002-07-17 9:11 ` Kai Großjohann
2002-07-18 14:54 ` Richard Stallman
2002-07-18 21:45 ` Ken Raeburn
2002-07-18 14:55 ` Richard Stallman
2002-07-18 20:13 ` Ken Raeburn
2002-07-19 13:03 ` Andreas Schwab
2002-07-19 16:24 ` Ken Raeburn
2002-07-19 16:54 ` Richard Stallman
2002-07-19 17:51 ` Ken Raeburn
2002-07-18 14:56 ` Richard Stallman
2002-07-18 19:54 ` Ken Raeburn
2002-07-19 4:23 ` Stefan Monnier
2002-07-19 12:56 ` Ken Raeburn
2002-07-19 13:34 ` Stefan Monnier [this message]
2002-07-19 14:16 ` Andreas Schwab
2002-07-19 15:04 ` Stefan Monnier
2002-07-19 16:54 ` Richard Stallman
2002-07-19 17:48 ` Ken Raeburn
2002-07-19 18:25 ` Marius Vollmer
2002-07-20 0:35 ` Richard Stallman
2002-07-20 12:00 ` Marius Vollmer
2002-07-21 20:14 ` Richard Stallman
2002-07-19 16:54 ` Richard Stallman
2002-07-04 19:07 ` ehelp woes, or why I hate a module that I love so much Henrik Enberg
2002-07-05 0:49 ` Juanma Barranquero
2002-07-05 11:15 ` Per Abrahamsen
2002-07-05 10:48 ` Richard Stallman
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