* bug#73771: 30.0.91; etags generates broken TAGS file for multi-line regex match
@ 2024-10-12 14:39 Morgan Willcock
2024-10-12 16:22 ` Eli Zaretskii
0 siblings, 1 reply; 4+ messages in thread
From: Morgan Willcock @ 2024-10-12 14:39 UTC (permalink / raw)
To: 73771
It appears as though using the multi-line regex matching feature of
etags generates a TAGS file which accidentally contains additional
newline characters.
To test, create a source file for a test language which has some
variable definitions to match, where variables are defined using a
keyword "define" followed by a variable name that begins with "$":
## Create a test source file.
> /tmp/source printf 'Top of file\n\n'
## Write a multi-line variable definition that ends at a newline
>>/tmp/source printf 'define\n$a\n'
## Write a multi-line variable definition that doesn't end at a newline.
>>/tmp/source printf 'define\n$b;\n'
Now create a TAGS file based on multi-line matching the variable
definitions:
etags --lang=none --regex='/define[ \t\n]+\(\$[a-z]+\)/\1/m' -o /tmp/TAGS /tmp/source
Note that the capture group does not include any newline characters, but
the contents of the TAGS file seems have inserted an additional newline
character in the line which locates $a:
cat /tmp/TAGS
/tmp/source,24
$a
$a4,20
$b;$b6,30
Now try to locate $a using the TAGS file, which fails with the message
"xref--not-found-error: No apropos found for: a":
emacs -Q \
--eval "(find-file \"/tmp/source\")" \
--eval "(visit-tags-table \"/tmp/TAGS\")" \
--eval "(xref-find-apropos \"a\")"
The problem only seems to occur where the multi-line regex match
finishes immediately before the line ending, i.e. there are no issues
locating $b:
emacs -Q \
--eval "(find-file \"/tmp/source\")" \
--eval "(visit-tags-table \"/tmp/TAGS\")" \
--eval "(xref-find-apropos \"b\")"
In GNU Emacs 30.0.91 (build 2, x86_64-pc-linux-gnu, X toolkit, cairo
version 1.16.0, Xaw3d scroll bars) of 2024-09-12 built on inspiron
Windowing system distributor 'The X.Org Foundation', version 11.0.12101007
System Description: Debian GNU/Linux 12 (bookworm)
Configured using:
'configure --with-native-compilation=aot --with-xml2
--with-x-toolkit=lucid'
Configured features:
CAIRO DBUS FREETYPE GIF GLIB GMP GNUTLS GSETTINGS HARFBUZZ JPEG
LIBSELINUX LIBXML2 MODULES NATIVE_COMP NOTIFY INOTIFY PDUMPER PNG RSVG
SECCOMP SOUND SQLITE3 THREADS TIFF TOOLKIT_SCROLL_BARS WEBP X11 XAW3D
XDBE XIM XINPUT2 XPM LUCID ZLIB
Important settings:
value of $LANG: en_GB.UTF-8
value of $XMODIFIERS: @im=ibus
locale-coding-system: utf-8-unix
Major mode: Shell-script
Minor modes in effect:
server-mode: t
global-corfu-mode: t
corfu-mode: t
jabber-activity-mode: t
which-key-mode: t
global-devil-mode: t
devil-mode: t
erc-ring-mode: t
erc-netsplit-mode: t
erc-menu-mode: t
erc-list-mode: t
erc-imenu-mode: t
erc-pcomplete-mode: t
erc-button-mode: t
erc-fill-mode: t
erc-stamp-mode: t
erc-irccontrols-mode: t
erc-move-to-prompt-mode: t
erc-readonly-mode: t
erc-scrolltobottom-mode: t
erc-spelling-mode: t
erc-track-mode: t
erc-track-minor-mode: t
erc-match-mode: t
erc-autojoin-mode: t
erc-networks-mode: t
sh-electric-here-document-mode: t
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global-display-fill-column-indicator-mode: t
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global-hl-line-mode: t
display-time-mode: t
flyspell-mode: t
editorconfig-mode: t
tooltip-mode: t
global-eldoc-mode: t
show-paren-mode: t
electric-indent-mode: t
mouse-wheel-mode: t
file-name-shadow-mode: t
global-font-lock-mode: t
font-lock-mode: t
blink-cursor-mode: t
minibuffer-regexp-mode: t
column-number-mode: t
line-number-mode: t
transient-mark-mode: t
auto-composition-mode: t
auto-encryption-mode: t
auto-compression-mode: t
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/home/mwillcock/.emacs.d/elpa/org-9.7.12/ol-bbdb hides /usr/local/share/emacs/30.0.91/lisp/org/ol-bbdb
/home/mwillcock/.emacs.d/elpa/org-9.7.12/ob-sql hides /usr/local/share/emacs/30.0.91/lisp/org/ob-sql
/home/mwillcock/.emacs.d/elpa/org-9.7.12/org-src hides /usr/local/share/emacs/30.0.91/lisp/org/org-src
/home/mwillcock/.emacs.d/elpa/org-9.7.12/org-fold hides /usr/local/share/emacs/30.0.91/lisp/org/org-fold
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(strings 32 284451 9119) (string-bytes 1 7768066) (vectors 16 178913)
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^ permalink raw reply [flat|nested] 4+ messages in thread
* bug#73771: 30.0.91; etags generates broken TAGS file for multi-line regex match
2024-10-12 14:39 bug#73771: 30.0.91; etags generates broken TAGS file for multi-line regex match Morgan Willcock
@ 2024-10-12 16:22 ` Eli Zaretskii
2024-10-13 10:48 ` Francesco Potortì
0 siblings, 1 reply; 4+ messages in thread
From: Eli Zaretskii @ 2024-10-12 16:22 UTC (permalink / raw)
To: Morgan Willcock, Francesco Potortì; +Cc: 73771
> From: Morgan Willcock <morgan@ice9.digital>
> Date: Sat, 12 Oct 2024 15:39:59 +0100
>
> It appears as though using the multi-line regex matching feature of
> etags generates a TAGS file which accidentally contains additional
> newline characters.
>
> To test, create a source file for a test language which has some
> variable definitions to match, where variables are defined using a
> keyword "define" followed by a variable name that begins with "$":
>
> ## Create a test source file.
> > /tmp/source printf 'Top of file\n\n'
> ## Write a multi-line variable definition that ends at a newline
> >>/tmp/source printf 'define\n$a\n'
> ## Write a multi-line variable definition that doesn't end at a newline.
> >>/tmp/source printf 'define\n$b;\n'
>
> Now create a TAGS file based on multi-line matching the variable
> definitions:
>
> etags --lang=none --regex='/define[ \t\n]+\(\$[a-z]+\)/\1/m' -o /tmp/TAGS /tmp/source
>
> Note that the capture group does not include any newline characters, but
> the contents of the TAGS file seems have inserted an additional newline
> character in the line which locates $a:
>
> cat /tmp/TAGS
>
> /tmp/source,24
> $a
> $a4,20
> $b;$b6,30
This is because etags always records one extra character with the
regexp match, which is harmless, unless that extra character is a
newline. The patch below fixes it:
diff --git a/lib-src/etags.c b/lib-src/etags.c
index a822a82..848d8ea 100644
--- a/lib-src/etags.c
+++ b/lib-src/etags.c
@@ -7420,7 +7420,7 @@ regex_tag_multiline (void)
/* Force explicit tag name, if a name is there. */
pfnote (name, true, buffer + linecharno,
- charno - linecharno + 1, lineno, linecharno);
+ charno - linecharno, lineno, linecharno);
if (debug)
fprintf (stderr, "%s on %s:%"PRIdMAX": %s\n",
Francesco, why does the code add one more character there? It looks
to me like an off-by-one error, because "charno - linecharno + 1" is
interpreted by pfnote as the length of the portion of the line to
record the regexp match. This code was there since you first
introduced multi-line regexps back in 2002. Am I missing something
here?
(Removing the +1" part will need to update the expected results in the
test suite, as they currently include that extra character, but that
is okay.)
^ permalink raw reply related [flat|nested] 4+ messages in thread
* bug#73771: 30.0.91; etags generates broken TAGS file for multi-line regex match
2024-10-12 16:22 ` Eli Zaretskii
@ 2024-10-13 10:48 ` Francesco Potortì
2024-10-13 12:58 ` Eli Zaretskii
0 siblings, 1 reply; 4+ messages in thread
From: Francesco Potortì @ 2024-10-13 10:48 UTC (permalink / raw)
To: Eli Zaretskii; +Cc: 73771, Morgan Willcock
>This is because etags always records one extra character with the
>regexp match, which is harmless, unless that extra character is a
>newline. The patch below fixes it:
>
>diff --git a/lib-src/etags.c b/lib-src/etags.c
>index a822a82..848d8ea 100644
>--- a/lib-src/etags.c
>+++ b/lib-src/etags.c
>@@ -7420,7 +7420,7 @@ regex_tag_multiline (void)
>
> /* Force explicit tag name, if a name is there. */
> pfnote (name, true, buffer + linecharno,
>- charno - linecharno + 1, lineno, linecharno);
>+ charno - linecharno, lineno, linecharno);
>
> if (debug)
> fprintf (stderr, "%s on %s:%"PRIdMAX": %s\n",
>
>Francesco, why does the code add one more character there?
While I can't remember the reason, I am sure it was not done by chance.
Sure, I may have been wrong at that time, or maybe that reason is now obsolete. To check, one should run the etags regression test and check the results.
Off the top of my head, it may have to do with implicitly named tags that are initial substring of a different tag, but this may be a fake reconstruction of my mind,
^ permalink raw reply [flat|nested] 4+ messages in thread
* bug#73771: 30.0.91; etags generates broken TAGS file for multi-line regex match
2024-10-13 10:48 ` Francesco Potortì
@ 2024-10-13 12:58 ` Eli Zaretskii
0 siblings, 0 replies; 4+ messages in thread
From: Eli Zaretskii @ 2024-10-13 12:58 UTC (permalink / raw)
To: Francesco Potortì; +Cc: 73771, morgan
> From: Francesco Potortì <pot@gnu.org>
> Date: Sun, 13 Oct 2024 12:48:40 +0200
> Cc: 73771@debbugs.gnu.org,
> Morgan Willcock <morgan@ice9.digital>
>
> >This is because etags always records one extra character with the
> >regexp match, which is harmless, unless that extra character is a
> >newline. The patch below fixes it:
> >
> >diff --git a/lib-src/etags.c b/lib-src/etags.c
> >index a822a82..848d8ea 100644
> >--- a/lib-src/etags.c
> >+++ b/lib-src/etags.c
> >@@ -7420,7 +7420,7 @@ regex_tag_multiline (void)
> >
> > /* Force explicit tag name, if a name is there. */
> > pfnote (name, true, buffer + linecharno,
> >- charno - linecharno + 1, lineno, linecharno);
> >+ charno - linecharno, lineno, linecharno);
> >
> > if (debug)
> > fprintf (stderr, "%s on %s:%"PRIdMAX": %s\n",
> >
> >Francesco, why does the code add one more character there?
>
> While I can't remember the reason, I am sure it was not done by chance.
>
> Sure, I may have been wrong at that time, or maybe that reason is now obsolete. To check, one should run the etags regression test and check the results.
I already did. The only differences I see are in that 1 extra
character, which is now no longer written to TAGS in the tests which
use multi-line regexps.
Note that the change is only in this single call to pfnote, from the
code that is part of generating tags from multi-line regexp matches.
> Off the top of my head, it may have to do with implicitly named tags that are initial substring of a different tag, but this may be a fake reconstruction of my mind,
The tags we produce from regexp matches are norally explicitly named,
AFAICT:
/* Match occurred. Construct a tag. */
while (charno < rp->regs.end[0])
if (buffer[charno++] == '\n')
lineno++, linecharno = charno;
name = rp->name;
if (name[0] == '\0')
name = NULL;
else /* make a named tag */
name = substitute (buffer, rp->name, &rp->regs);
/* Force explicit tag name, if a name is there. */
pfnote (name, true, buffer + linecharno,
charno - linecharno, lineno, linecharno);
But if you say that we should add that offset of 1 when 'name' is
NULL, I'm okay with doing that.
^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2024-10-13 12:58 UTC | newest]
Thread overview: 4+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2024-10-12 14:39 bug#73771: 30.0.91; etags generates broken TAGS file for multi-line regex match Morgan Willcock
2024-10-12 16:22 ` Eli Zaretskii
2024-10-13 10:48 ` Francesco Potortì
2024-10-13 12:58 ` Eli Zaretskii
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