GNU bug report logs - #22238
25.0.50; isearch symbol search can't find ,@symbol

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Package: emacs; Reported by: Michael Heerdegen <michael_heerdegen@HIDDEN>; dated Fri, 25 Dec 2015 21:30:02 UTC; Maintainer for emacs is bug-gnu-emacs@HIDDEN.

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From: Michael Heerdegen <michael_heerdegen@HIDDEN>
To: Dmitry Gutov <dgutov@HIDDEN>
Subject: Re: bug#22238: 25.0.50; isearch symbol search can't find ,@symbol
References: <87io3mtdxw.fsf@HIDDEN> <567DBA1F.7030702@HIDDEN>
Date: Mon, 05 Dec 2016 14:55:22 +0100
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 Dec 2015 23:50:23 +0200")
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Dmitry Gutov <dgutov@HIDDEN> writes:

> Maybe that should just be reverted. A more proper fix would make Emacs
> not consider @ as a symbol constituent when it's the first
> character. The "p" in "_ p" apparently tries but fails to do that.

FWIW, there is a similar problem concerning the end of the symbol and
".".

The real-life use case is that I wanted to rename the argument of a
function like this:

(defun el-search--string-matcher (eregexp)
  "Return a compiled match predicate for EREGEXP.
That's a predicate returning non-nil when extended regexp EREGEXP ...

with isearch in symbol mode.  But symbol search doesn't find the
occurrence of "EREGEXP" at the end of the first sentence of the
docstring.  Again, strictly speaking the behavior is as documented I
think ("."  is a symbol constituent), but this also again foils the
purpose of symbol matching in "real-life".  And again, the situation can
be ambiguous in rare cases.


Michael.




Information forwarded to bug-gnu-emacs@HIDDEN:
bug#22238; Package emacs. Full text available.

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Subject: Re: bug#22238: 25.0.50; isearch symbol search can't find ,@symbol
To: Andreas Schwab <schwab@HIDDEN>
References: <87io3mtdxw.fsf@HIDDEN> <567DBA1F.7030702@HIDDEN>
 <m2mvsyw5da.fsf@HIDDEN> <567DBE7E.2090705@HIDDEN>
 <m2a8oxfpkj.fsf@HIDDEN>
From: Dmitry Gutov <dgutov@HIDDEN>
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Date: Sat, 26 Dec 2015 14:32:24 +0200
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On 12/26/2015 12:54 PM, Andreas Schwab wrote:

> Such symbols are used by Emacs, so they should be properly supported.

Example?

> since the method
> will be the same.

Not at all. ,@foo is not a symbol. It's unquote-splicing followed by 
symbol foo.




Information forwarded to bug-gnu-emacs@HIDDEN:
bug#22238; Package emacs. Full text available.

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From: Andreas Schwab <schwab@HIDDEN>
To: Dmitry Gutov <dgutov@HIDDEN>
Subject: Re: bug#22238: 25.0.50; isearch symbol search can't find ,@symbol
References: <87io3mtdxw.fsf@HIDDEN> <567DBA1F.7030702@HIDDEN>
 <m2mvsyw5da.fsf@HIDDEN> <567DBE7E.2090705@HIDDEN>
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Dmitry Gutov <dgutov@HIDDEN> writes:

> On 12/26/2015 12:06 AM, Andreas Schwab wrote:
>
>> But @foo is a valid symbol.
>
> Indeed. If you like to implement the syntax-propertize-function that will
> distinguish between them, be my guest.
>
> But it's more important to discern "symbol" in ,@symbol than support
> symbols with rare names like that.

Such symbols are used by Emacs, so they should be properly supported.
There is no point in supporting ,@foo but not @foo, since the method
will be the same.

Andreas.

-- 
Andreas Schwab, schwab@HIDDEN
GPG Key fingerprint = 58CA 54C7 6D53 942B 1756  01D3 44D5 214B 8276 4ED5
"And now for something completely different."




Information forwarded to bug-gnu-emacs@HIDDEN:
bug#22238; Package emacs. Full text available.

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Subject: Re: bug#22238: 25.0.50; isearch symbol search can't find ,@symbol
To: Andreas Schwab <schwab@HIDDEN>
References: <87io3mtdxw.fsf@HIDDEN> <567DBA1F.7030702@HIDDEN>
 <m2mvsyw5da.fsf@HIDDEN>
From: Dmitry Gutov <dgutov@HIDDEN>
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On 12/26/2015 12:06 AM, Andreas Schwab wrote:

> But @foo is a valid symbol.

Indeed. If you like to implement the syntax-propertize-function that 
will distinguish between them, be my guest.

But it's more important to discern "symbol" in ,@symbol than support 
symbols with rare names like that.




Information forwarded to bug-gnu-emacs@HIDDEN:
bug#22238; Package emacs. Full text available.

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From: Andreas Schwab <schwab@HIDDEN>
To: Dmitry Gutov <dgutov@HIDDEN>
Subject: Re: bug#22238: 25.0.50; isearch symbol search can't find ,@symbol
References: <87io3mtdxw.fsf@HIDDEN> <567DBA1F.7030702@HIDDEN>
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Date: Fri, 25 Dec 2015 23:06:09 +0100
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Dmitry Gutov <dgutov@HIDDEN> writes:

> Maybe that should just be reverted. A more proper fix would make Emacs not
> consider @ as a symbol constituent when it's the first character.

But @foo is a valid symbol.

Andreas.

-- 
Andreas Schwab, schwab@HIDDEN
GPG Key fingerprint = 58CA 54C7 6D53 942B 1756  01D3 44D5 214B 8276 4ED5
"And now for something completely different."




Information forwarded to bug-gnu-emacs@HIDDEN:
bug#22238; Package emacs. Full text available.

Message received at 22238 <at> debbugs.gnu.org:


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Subject: Re: bug#22238: 25.0.50; isearch symbol search can't find ,@symbol
To: Michael Heerdegen <michael_heerdegen@HIDDEN>
References: <87io3mtdxw.fsf@HIDDEN> <567DBA1F.7030702@HIDDEN>
 <87egeaxkay.fsf@HIDDEN>
From: Dmitry Gutov <dgutov@HIDDEN>
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Date: Sat, 26 Dec 2015 00:03:21 +0200
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On 12/25/2015 11:58 PM, Michael Heerdegen wrote:

> Can a similar problem appear with other programming modes/languages?

A misconfigured syntax table can lead to this and other problems.





Information forwarded to bug-gnu-emacs@HIDDEN:
bug#22238; Package emacs. Full text available.

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From: Michael Heerdegen <michael_heerdegen@HIDDEN>
To: Dmitry Gutov <dgutov@HIDDEN>
Subject: Re: bug#22238: 25.0.50; isearch symbol search can't find ,@symbol
References: <87io3mtdxw.fsf@HIDDEN> <567DBA1F.7030702@HIDDEN>
Date: Fri, 25 Dec 2015 22:58:13 +0100
In-Reply-To: <567DBA1F.7030702@HIDDEN> (Dmitry Gutov's message of "Fri, 25
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Dmitry Gutov <dgutov@HIDDEN> writes:

> I'm assuming this is about emacs-lisp-mode.

I forgot to tell, but yes.

> This seems to be a regression from the fix for
> http://debbugs.gnu.org/cgi/bugreport.cgi?bug=17325.
>
> Maybe that should just be reverted. A more proper fix would make Emacs
> not consider @ as a symbol constituent when it's the first
> character. The "p" in "_ p" apparently tries but fails to do that.

Can a similar problem appear with other programming modes/languages?


Thanks,

Michael.




Information forwarded to bug-gnu-emacs@HIDDEN:
bug#22238; Package emacs. Full text available.

Message received at 22238 <at> debbugs.gnu.org:


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Subject: Re: bug#22238: 25.0.50; isearch symbol search can't find ,@symbol
To: Michael Heerdegen <michael_heerdegen@HIDDEN>, 22238 <at> debbugs.gnu.org
References: <87io3mtdxw.fsf@HIDDEN>
From: Dmitry Gutov <dgutov@HIDDEN>
Message-ID: <567DBA1F.7030702@HIDDEN>
Date: Fri, 25 Dec 2015 23:50:23 +0200
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On 12/25/2015 11:29 PM, Michael Heerdegen wrote:

> Regexp searching for "\_<" stops at the "@" char (not at the "s").  At
> least, `isearch-forward-symbol' seems to behave as documented, dunno
> about the "\_<" regexp.

I'm assuming this is about emacs-lisp-mode.

As you can see, this is not about isearch: re-search-forward behaves the 
same in this regard.

This seems to be a regression from the fix for 
http://debbugs.gnu.org/cgi/bugreport.cgi?bug=17325.

Maybe that should just be reverted. A more proper fix would make Emacs 
not consider @ as a symbol constituent when it's the first character. 
The "p" in "_ p" apparently tries but fails to do that.




Information forwarded to bug-gnu-emacs@HIDDEN:
bug#22238; Package emacs. Full text available.

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From: Michael Heerdegen <michael_heerdegen@HIDDEN>
To: bug-gnu-emacs@HIDDEN
Subject: 25.0.50; isearch symbol search can't find ,@symbol
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Hello,

isearch's symbol search (M-s _) doesn't find symbols as in

  ,@symbol

when searching for "symbol".  This was already the case in Emacs 24.5.

Regexp searching for "\_<" stops at the "@" char (not at the "s").  At
least, `isearch-forward-symbol' seems to behave as documented, dunno
about the "\_<" regexp.

Anyway, the behavior is not good.  People use to replace symbols with
isearch's symbol search when they have renamed a function or variable.
Missing occurrences can introduce bugs.


Thanks for your help,

Michael. 




In GNU Emacs 25.0.50.8 (x86_64-pc-linux-gnu, GTK+ Version 3.18.5)
 of 2015-12-23
Repository revision: 09053075225fec8a6cf7a72017a6dfc1ec6b6f0c
Windowing system distributor 'The X.Org Foundation', version 11.0.11703000
System Description:	Debian GNU/Linux testing (stretch)

Configured features:
XPM JPEG TIFF GIF PNG RSVG IMAGEMAGICK SOUND DBUS GSETTINGS NOTIFY
LIBXML2 FREETYPE XFT ZLIB TOOLKIT_SCROLL_BARS GTK3 X11

Important settings:
  value of $LC_ALL: de_DE.utf8
  value of $LC_COLLATE: C
  value of $LC_TIME: C
  value of $LANG: de_DE.utf8
  locale-coding-system: utf-8-unix





Acknowledgement sent to Michael Heerdegen <michael_heerdegen@HIDDEN>:
New bug report received and forwarded. Copy sent to bug-gnu-emacs@HIDDEN. Full text available.
Report forwarded to bug-gnu-emacs@HIDDEN:
bug#22238; Package emacs. Full text available.
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