GNU bug report logs - #22589
25.0.90; First match found by isearch-forward-symbol is not necessarily a symbol.

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Bastian Beischer <bastian.beischer <at> gmail.com>
To: bug-gnu-emacs <at> gnu.org
Subject: 25.0.90;
 First match found by isearch-forward-symbol is not necessarily a
 symbol.
Date: Sun, 07 Feb 2016 21:41:34 +0100

Instructions to reproduce:

1) emacs -Q
2) open a new file called "test.c"
3) enter this text:

int main() {
  int i = 0;
  return 0;
}

4) go to the beginning of the buffer
5) hit M-s _ and search for the symbol "i"

---> The very first character in "int main" is highlighted as a match
     even though the first match should be "i" in "int i =0".



In GNU Emacs 25.0.90.1 (x86_64-unknown-linux-gnu, GTK+ Version 3.18.7)
 of 2016-02-07 built on bastian-desktop
Repository revision: 67fcd5addcd91169f79dc5d51d0a71eb2b486aed
Windowing system distributor 'The X.Org Foundation', version 11.0.11800000
Configured using:
 'configure --prefix=/usr --sysconfdir=/etc --libexecdir=/usr/lib
 --localstatedir=/var --mandir=/usr/share/man
 --pdfdir=/usr/share/doc/emacs/pdf --with-sound=alsa --without-gconf
 --with-x-toolkit=gtk3 --with-xft 'CFLAGS=-march=x86-64 -mtune=generic
 -O2 -pipe -fstack-protector-strong' CPPFLAGS=-D_FORTIFY_SOURCE=2
 LDFLAGS=-Wl,-O1,--sort-common,--as-needed,-z,relro'

Configured features:
XPM JPEG TIFF GIF PNG RSVG IMAGEMAGICK SOUND GPM DBUS GSETTINGS NOTIFY
ACL GNUTLS LIBXML2 FREETYPE M17N_FLT LIBOTF XFT ZLIB TOOLKIT_SCROLL_BARS
GTK3 X11

Important settings:
  value of $LANG: en_US.UTF-8
  locale-coding-system: utf-8-unix

Major mode: C++/l

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Recent messages:
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[yas] Loading snippet files from /home/beischer/.emacs.d/snippets/c++-mode
[yas] Loading for `cc-mode', just-in-time: (lambda nil (yas--load-directory-1 (quote /home/beischer/.emacs.d/elpa/yasnippet-20160131.948/snippets/cc-mode) (quote cc-mode)))!
[yas] Loading snippet files from /home/beischer/.emacs.d/elpa/yasnippet-20160131.948/snippets/cc-mode
[yas] Loading for `cc-mode', just-in-time: (lambda nil (yas--load-directory-1 (quote /home/beischer/.emacs.d/snippets/cc-mode) (quote cc-mode)))!
[yas] Loading snippet files from /home/beischer/.emacs.d/snippets/cc-mode
Mark saved where search started [4 times]
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C-c C-c is undefined

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Memory information:
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 (symbols 48 53448 2)
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 (vectors 16 78402)
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 (heap 1024 61004 6597))

Message #8 received at 22589 <at> debbugs.gnu.org (full text, mbox):

From: Bastian Beischer <bastian.beischer <at> rwth-aachen.de>
To: 22589 <at> debbugs.gnu.org
Subject: 25.0.90; First match found by isearch-forward-symbol is not
 necessarily a symbol.
Date: Mon, 8 Feb 2016 01:09:31 +0100

[Message part 1 (text/plain, inline)]

The same bug also exists in isearch-forward-word.

-- 
Bastian Beischer
RWTH Aachen University of Technology

@RWTH Aachen
Office: 28 C 203
Phone: +49-241-80-27205
E-mail: beischer <at> physik.rwth-aachen.de
Address: I. Physikalisches Institut B, Sommerfeldstr. 14, D-52074 Aachen

@CERN
Office: Bdg 32-4-B12
Phone: +41-22-76-75750
E-mail: bastian.beischer <at> cern.ch
Address: CERN, CH-1211 Geneve 23

[Message part 2 (text/html, inline)]

Message #11 received at 22589 <at> debbugs.gnu.org (full text, mbox):

From: Juri Linkov <juri <at> linkov.net>
To: Bastian Beischer <bastian.beischer <at> gmail.com>
Cc: 22589 <at> debbugs.gnu.org
Subject: Re: bug#22589: 25.0.90;
 First match found by isearch-forward-symbol is not necessarily a
 symbol.
Date: Mon, 08 Feb 2016 02:54:39 +0200

> Instructions to reproduce:
>
> 1) emacs -Q
> 2) open a new file called "test.c"
> 3) enter this text:
>
> int main() {
>   int i = 0;
>   return 0;
> }
>
> 4) go to the beginning of the buffer
> 5) hit M-s _ and search for the symbol "i"
>
> ---> The very first character in "int main" is highlighted as a match
>      even though the first match should be "i" in "int i =0".

Please imagine that you need to search for the symbol "int"
(or any other symbol longer than the single-character "i").
How then you would be able to type the whole symbol "int"
if the search failed after typing the first character "i"
(or moved to the first occurrence of the symbol "i"
when you need to find the symbol "int")?

Message #14 received at 22589 <at> debbugs.gnu.org (full text, mbox):

From: Michael Heerdegen <michael_heerdegen <at> web.de>
To: Juri Linkov <juri <at> linkov.net>
Cc: Bastian Beischer <bastian.beischer <at> gmail.com>, 22589 <at> debbugs.gnu.org
Subject: Re: bug#22589: 25.0.90;
 First match found by isearch-forward-symbol is not necessarily a
 symbol.
Date: Mon, 08 Feb 2016 12:30:20 +0100

Juri Linkov <juri <at> linkov.net> writes:

> Please imagine that you need to search for the symbol "int" (or any
> other symbol longer than the single-character "i").  How then you
> would be able to type the whole symbol "int" if the search failed
> after typing the first character "i" (or moved to the first occurrence
> of the symbol "i" when you need to find the symbol "int")?

I agree that this is a useful feature.  Not having it would make
entering the search pattern confusing.

But I think it should be documented.  When does it occur, and what else
is matched (one or two sentences).

There could also be some indication when this first match is not a
"real" match - but that might be overkill.


Regards,

Michael.

Message #17 received at 22589 <at> debbugs.gnu.org (full text, mbox):

From: Bastian Beischer <bastian.beischer <at> gmail.com>
To: Juri Linkov <juri <at> linkov.net>
Cc: 22589 <at> debbugs.gnu.org
Subject: Re: bug#22589: 25.0.90; First match found by isearch-forward-symbol
 is not necessarily a symbol.
Date: Mon, 8 Feb 2016 12:34:01 +0100

[Message part 1 (text/plain, inline)]

Hello Juri,

On Mon, Feb 8, 2016 at 1:54 AM, Juri Linkov <juri <at> linkov.net> wrote:

> > Instructions to reproduce:
> >
> > 1) emacs -Q
> > 2) open a new file called "test.c"
> > 3) enter this text:
> >
> > int main() {
> >   int i = 0;
> >   return 0;
> > }
> >
> > 4) go to the beginning of the buffer
> > 5) hit M-s _ and search for the symbol "i"
> >
> > ---> The very first character in "int main" is highlighted as a match
> >      even though the first match should be "i" in "int i =0".
>
> Please imagine that you need to search for the symbol "int"
> (or any other symbol longer than the single-character "i").
> How then you would be able to type the whole symbol "int"
> if the search failed after typing the first character "i"
> (or moved to the first occurrence of the symbol "i"
> when you need to find the symbol "int")?
>

What you are saying makes sense, but the bug I outlined above is more
severe.

For example: In this line:

unsigned int i = 0;

when searching for the symbol "i". Taking your comment into account I can
see why the first match would be "int", although that's actually not a
match for "\_<i\_>", because if we would match "i" directly, then there
would be no way to go back to match "int" should the user enter more
characters. However, what happens is that the "i" in unsIgned is matched,
which is surely never going to be a symbol...

-- 
Bastian Beischer
RWTH Aachen University of Technology

@CERN
Office: Bdg 32-4-B12
Phone: +41-22-76-75750
E-mail: bastian.beischer <at> cern.ch
Address: CERN, CH-1211 Geneve 23

@RWTH Aachen
Office: 28 C 203
Phone: +49-241-80-27205
E-mail: beischer <at> physik.rwth-aachen.de
Address: I. Physikalisches Institut B, Sommerfeldstr. 14, D-52074 Aachen

[Message part 2 (text/html, inline)]

Message #20 received at 22589 <at> debbugs.gnu.org (full text, mbox):

From: Juri Linkov <juri <at> linkov.net>
To: Bastian Beischer <bastian.beischer <at> gmail.com>
Cc: 22589 <at> debbugs.gnu.org
Subject: Re: bug#22589: 25.0.90;
 First match found by isearch-forward-symbol is not necessarily a
 symbol.
Date: Wed, 10 Feb 2016 02:54:54 +0200

> What you are saying makes sense, but the bug I outlined above is more
> severe.
>
> For example: In this line:
>
> unsigned int i = 0;
>
> when searching for the symbol "i". Taking your comment into account I can
> see why the first match would be "int", although that's actually not a
> match for "\_<i\_>", because if we would match "i" directly, then there
> would be no way to go back to match "int" should the user enter more
> characters. However, what happens is that the "i" in unsIgned is matched,
> which is surely never going to be a symbol...

Thank you for the detailed test case.  The reason why “i” matches
in the middle of the symbol by not adding an anchor “\_<” is because
we need to support the symbol search backwards as well.  This means
that the symbol search should add “\_<” for searching forward,
and “\_>” for a backward search.  The same applies to the word search.

We could do this by adding an optional argument ‘backward’ to both
‘word-search-regexp’ and ‘isearch-symbol-regexp’.  One complication is that
this change is not backward-compatible.  Instead of this, I propose to use
different values of the existing arg ‘lax’, e.g. values ‘nil’
for a forward search, and ‘backward’ otherwise.

Then it will match at the beginning of the symbol for a forward search,
and at the end for a backward search.  Same for the word search.

Message #23 received at 22589 <at> debbugs.gnu.org (full text, mbox):

From: Juri Linkov <juri <at> linkov.net>
To: Michael Heerdegen <michael_heerdegen <at> web.de>
Cc: Bastian Beischer <bastian.beischer <at> gmail.com>, 22589 <at> debbugs.gnu.org
Subject: Re: bug#22589: 25.0.90;
 First match found by isearch-forward-symbol is not necessarily a
 symbol.
Date: Wed, 10 Feb 2016 02:55:05 +0200

> I agree that this is a useful feature.  Not having it would make
> entering the search pattern confusing.
>
> But I think it should be documented.  When does it occur, and what else
> is matched (one or two sentences).
>
> There could also be some indication when this first match is not a
> "real" match - but that might be overkill.

Then we could use the already existing indication "[pending]"
in the search prompt.

Message #26 received at 22589 <at> debbugs.gnu.org (full text, mbox):

From: Michael Heerdegen <michael_heerdegen <at> web.de>
To: Juri Linkov <juri <at> linkov.net>
Cc: Bastian Beischer <bastian.beischer <at> gmail.com>, 22589 <at> debbugs.gnu.org
Subject: Re: bug#22589: 25.0.90;
 First match found by isearch-forward-symbol is not necessarily a
 symbol.
Date: Wed, 10 Feb 2016 12:30:34 +0100

Juri Linkov <juri <at> linkov.net> writes:

> > I agree that this is a useful feature.  Not having it would make
> > entering the search pattern confusing.
> >
> > But I think it should be documented.  When does it occur, and what else
> > is matched (one or two sentences).
> >
> > There could also be some indication when this first match is not a
> > "real" match - but that might be overkill.
>
> Then we could use the already existing indication "[pending]"
> in the search prompt.

I think that would be a good solution.

Michael.

Message #31 received at 22589 <at> debbugs.gnu.org (full text, mbox):

From: Juri Linkov <juri <at> linkov.net>
To: Bastian Beischer <bastian.beischer <at> gmail.com>
Cc: 22589 <at> debbugs.gnu.org
Subject: Re: bug#22589: 25.0.90;
 First match found by isearch-forward-symbol is not necessarily a
 symbol.
Date: Mon, 06 Feb 2017 01:39:13 +0200

> Then it will match at the beginning of the symbol for a forward search,
> and at the end for a backward search.  Same for the word search.

In bug#25562 we found no more ideas how to improve the support for
the process of entering incomplete words, so in addition to the patch
in bug#25562 that adds indication, also I'm going to install this patch
that will optimize the incomplete search by removing conditional
matching at the beginning:

diff --git a/lisp/isearch.el b/lisp/isearch.el
index 5c48c30..90ffbec 100644
--- a/lisp/isearch.el
+++ b/lisp/isearch.el
@@ -1621,7 +1621,7 @@ (defun word-search-regexp (string &optional lax)
    ((string-match-p "\\`\\W+\\'" string) "\\W+")
    (t (concat
        (if (string-match-p "\\`\\W" string) "\\W+"
-	 (unless lax "\\<"))
+	 "\\<")
        (mapconcat 'regexp-quote (split-string string "\\W+" t) "\\W+")
        (if (string-match-p "\\W\\'" string) "\\W+"
 	 (unless lax "\\>"))))))
@@ -1749,7 +1749,7 @@ (defun isearch-symbol-regexp (string &optional lax)
      ((string-match-p (format "\\`%s\\'" not-word-symbol-re) string) not-word-symbol-re)
      (t (concat
 	 (if (string-match-p (format "\\`%s" not-word-symbol-re) string) not-word-symbol-re
-	   (unless lax "\\_<"))
+	   "\\_<")
 	 (mapconcat 'regexp-quote (split-string string not-word-symbol-re t) not-word-symbol-re)
 	 (if (string-match-p (format "%s\\'" not-word-symbol-re) string) not-word-symbol-re
 	   (unless lax "\\_>")))))))

Message #34 received at 22589 <at> debbugs.gnu.org (full text, mbox):

From: Michael Heerdegen <michael_heerdegen <at> web.de>
To: Juri Linkov <juri <at> linkov.net>
Cc: Bastian Beischer <bastian.beischer <at> gmail.com>, 22589 <at> debbugs.gnu.org
Subject: Re: bug#22589: 25.0.90;
 First match found by isearch-forward-symbol is not necessarily a
 symbol.
Date: Mon, 06 Feb 2017 12:10:26 +0100

Juri Linkov <juri <at> linkov.net> writes:

> > Then it will match at the beginning of the symbol for a forward search,
> > and at the end for a backward search.  Same for the word search.
>
> In bug#25562 we found no more ideas how to improve the support for
> the process of entering incomplete words, so in addition to the patch
> in bug#25562 that adds indication, also I'm going to install this patch
> that will optimize the incomplete search by removing conditional
> matching at the beginning:

I think I prefer the original behavior (but actually, I use a private
version of `word-search-regexp' that behaves entirely differently, so my
opinion doesn't matter).  But apart from that, the patch doesn't work as
expected (even with the other patch that adds indication also
installed):

- in emacs -Q, hit C-h i to go to the info top dir

- I want to word search for "directory".  point is at point-min.

- I hit d.  Isearch jumps to the "d" in "Type "d" in Info to..."

- I type the remaining letters: "irectory".  The isearch prompt says
  "Failed" apparently because I'm now past all matches and isearch
  didn't reconsider the text before the first match "d".


Michael.

Message #37 received at 22589 <at> debbugs.gnu.org (full text, mbox):

From: Juri Linkov <juri <at> linkov.net>
To: Michael Heerdegen <michael_heerdegen <at> web.de>
Cc: 22589 <at> debbugs.gnu.org
Subject: Re: bug#22589: 25.0.90;
 First match found by isearch-forward-symbol is not necessarily a
 symbol.
Date: Tue, 07 Feb 2017 02:11:20 +0200

>> In bug#25562 we found no more ideas how to improve the support for
>> the process of entering incomplete words, so in addition to the patch
>> in bug#25562 that adds indication, also I'm going to install this patch
>> that will optimize the incomplete search by removing conditional
>> matching at the beginning:
>
> I think I prefer the original behavior (but actually, I use a private
> version of `word-search-regexp' that behaves entirely differently, so my
> opinion doesn't matter).  But apart from that, the patch doesn't work as
> expected (even with the other patch that adds indication also
> installed):
>
> - in emacs -Q, hit C-h i to go to the info top dir
>
> - I want to word search for "directory".  point is at point-min.
>
> - I hit d.  Isearch jumps to the "d" in "Type "d" in Info to..."
>
> - I type the remaining letters: "irectory".  The isearch prompt says
>   "Failed" apparently because I'm now past all matches and isearch
>   didn't reconsider the text before the first match "d".

Hmm, this is strange.  Unlike the more radical patch in
https://debbugs.gnu.org/25562#22, the latest patch here in
https://debbugs.gnu.org/22589#31 is more moderate - it just restricts
matches to word beginnings, so your recipe didn't fail when I tried.

Message #40 received at 22589 <at> debbugs.gnu.org (full text, mbox):

From: Michael Heerdegen <michael_heerdegen <at> web.de>
To: Juri Linkov <juri <at> linkov.net>
Cc: 22589 <at> debbugs.gnu.org
Subject: Re: bug#22589: 25.0.90;
 First match found by isearch-forward-symbol is not necessarily a
 symbol.
Date: Tue, 07 Feb 2017 20:19:42 +0100

Juri Linkov <juri <at> linkov.net> writes:

> Hmm, this is strange.  Unlike the more radical patch in
> https://debbugs.gnu.org/25562#22, the latest patch here in
> https://debbugs.gnu.org/22589#31 is more moderate - it just restricts
> matches to word beginnings, so your recipe didn't fail when I tried.

My fault indeed.  Because the patch didn't apply with any Emacs tool, I
had applied it "by hand", but that in a wrong way.

Looks ok now after just calling "patch", and the behavior also seems to
make sense.  Sorry about the confusion.


Michael.

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