* bug#39805: 28.0.50; scan-sexps (scan_lists) incorrectly parsing circular list
@ 2020-02-26 21:33 No Wayman
2020-02-27 1:38 ` Noam Postavsky
0 siblings, 1 reply; 6+ messages in thread
From: No Wayman @ 2020-02-26 21:33 UTC (permalink / raw)
To: 39805
While developing a package that utilizes circular lists, I ran
into a bug when trying to describe-variable
a variable that contains circular lists. I've hewed it down to the
following:
** Minimal Reproducible Case
#+begin_src emacs-lisp :results raw h replace
(condition-case-unless-debug err
(with-temp-buffer
(insert "(#9=() :key val)")
(pp-buffer)
nil)
(error err)))
#+end_src
*** Throws
(scan-error Containing expression ends prematurely 1 1)
*** Expected
nil
*** Additional Info
- My hunch is that the problem lies in syntax.c's scan_lists, but
I have not had time to look deeply into it.
- The error is not thrown when the string contains only one of the
"#" or ":" characters.
For example: "(9=() :key val)" or "(#9=() key val)".
- Issue exists when running "emacs -Q" as far back as v25.3.2
(have not tested earlier versions)
**** backtrace
#+begin_src emacs-lisp
Debugger entered--Lisp error: (scan-error "Containing expression
ends prematurely" 1 1)
scan-sexps(3 -1)
forward-sexp(-1)
calculate-lisp-indent((1 1 5 nil nil nil 0 nil nil (1) nil))
lisp-indent-calc-next(#s(lisp-indent-state :stack (nil) :ppss (0
nil nil nil nil nil 0 nil nil nil nil) :ppss-point 1))
indent-sexp()
pp-buffer()
(progn (insert "(#9=() :key val)") (pp-buffer) nil)
(unwind-protect (progn (insert "(#9=() :key val)") (pp-buffer)
nil) (and (buffer-name temp-buffer) (kill-buffer temp-buffer)))
(save-current-buffer (set-buffer temp-buffer) (unwind-protect
(progn (insert "(#9=() :key val)") (pp-buffer) nil) (and
(buffer-name temp-buffer) (kill-buffer temp-buffer))))
(with-current-buffer temp-buffer (unwind-protect (progn (insert
"(#9=() :key val)") (pp-buffer) nil) (and (buffer-name
temp-buffer) (kill-buffer temp-buffer))))
(let ((temp-buffer (generate-new-buffer " *temp*")))
(with-current-buffer temp-buffer (unwind-protect (progn (insert
"(#9=() :key val)") (pp-buffer) nil) (and (buffer-name
temp-buffer) (kill-buffer temp-buffer)))))
(with-temp-buffer (insert "(#9=() :key val)") (pp-buffer) nil)
(condition-case err (with-temp-buffer (insert "(#9=() :key
val)") (pp-buffer) nil) ((debug error) err))
(condition-case-unless-debug err (with-temp-buffer (insert
"(#9=() :key val)") (pp-buffer) nil) (error err))
(progn (condition-case-unless-debug err (with-temp-buffer
(insert "(#9=() :key val)") (pp-buffer) nil) (error err)))
eval((progn (condition-case-unless-debug err (with-temp-buffer
(insert "(#9=() :key val)") (pp-buffer) nil) (error err))) nil)
org-babel-execute:emacs-lisp("(condition-case-unless-debug err\n
(with-temp-buffer\n (insert \"(#9=() :key val)\")\n
(pp-buffer)\n nil)\n (error err)))" ((:colname-names)
(:rowname-names) (:result-params "raw" "h" "replace")
(:result-type . value) (:results . "raw h replace") (:exports .
"code") (:session . "none") (:cache . "no") (:noweb . "no")
(:hlines . "no") (:tangle . "no") (:lexical . "no")))
org-babel-execute-src-block(nil ("emacs-lisp"
"(condition-case-unless-debug err\n (with-temp-buffer\n
(insert \"(#9=() :key val)\")\n (pp-buffer)\n nil)\n
(error err)))" ((:colname-names) (:rowname-names)
(:result-params "replace" "h" "raw") (:result-type . value)
(:results . "replace h raw") (:exports . "code") (:lexical .
"no") (:tangle . "no") (:hlines . "no") (:noweb . "no") (:cache
. "no") (:session . "none")) "" nil 47 "(ref:%s)"))
org-ctrl-c-ctrl-c(nil)
funcall-interactively(org-ctrl-c-ctrl-c nil)
call-interactively(org-ctrl-c-ctrl-c nil nil)
command-execute(org-ctrl-c-ctrl-c)
#+end_src
If any additional information would be useful or testing needs to
be done, I'm happy to help. Thank you.
In GNU Emacs 28.0.50 (build 1, x86_64-pc-linux-gnu, X toolkit,
cairo version 1.17.3, Xaw3d scroll bars)
of 2020-02-23 built on arch
Repository revision: eb34c108e234c3195ae75f14ec6c5b0964f022ad
Repository branch: master
Windowing system distributor 'The X.Org Foundation', version
11.0.12007000
System Description: Arch Linux
Recent messages:
[mu4e] Indexing completed; processed 1623, updated 0, cleaned-up 0
Auto-saving...done
Mark set
evil-line-move: End of buffer
Mark set [4 times]
evil-line-move: Beginning of buffer [11 times]
Mark set [3 times]
Error in post-command-hook (flyspell-post-command-hook):
(search-failed "
Basics")
user-error: No window right from selected window
evil-line-move: Beginning of buffer
Configured using:
'configure --prefix=/usr --sysconfdir=/etc --libexecdir=/usr/lib
--localstatedir=/var --mandir=/usr/share/man
--with-gameuser=:games
--with-sound=alsa --with-modules --without-gconf
--without-gsettings
--enable-link-time-optimization --with-x-toolkit=lucid --with-xft
--with-xaw3d --without-m17n-flt --with-cairo
--without-compress-install
'CFLAGS=-march=x86-64 -mtune=generic -O2 -pipe
-fstack-protector-strong
-fno-plt -g -flto -fuse-linker-plugin -s -fuse-ld=gold'
CPPFLAGS=-D_FORTIFY_SOURCE=2
LDFLAGS=-Wl,-O1,--sort-common,--as-needed,-z,relro,-z,now'
Configured features:
XAW3D XPM JPEG TIFF GIF PNG RSVG CAIRO SOUND GPM DBUS GLIB NOTIFY
INOTIFY ACL GNUTLS LIBXML2 FREETYPE HARFBUZZ LIBOTF ZLIB
TOOLKIT_SCROLL_BARS LUCID X11 XDBE XIM MODULES THREADS LIBSYSTEMD
JSON
PDUMPER LCMS2 GMP
Important settings:
value of $LANG: en_US.UTF-8
locale-coding-system: utf-8-unix
Major mode: Org
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org-better-repeat-mode: t
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^ permalink raw reply [flat|nested] 6+ messages in thread
* bug#39805: 28.0.50; scan-sexps (scan_lists) incorrectly parsing circular list
2020-02-26 21:33 bug#39805: 28.0.50; scan-sexps (scan_lists) incorrectly parsing circular list No Wayman
@ 2020-02-27 1:38 ` Noam Postavsky
2020-02-27 17:22 ` No Wayman
0 siblings, 1 reply; 6+ messages in thread
From: Noam Postavsky @ 2020-02-27 1:38 UTC (permalink / raw)
To: No Wayman; +Cc: 39805
# seems to be long standing
found 39805 25.3
tags 39805 + confirmed
quit
No Wayman <iarchivedmywholelife@gmail.com> writes:
> While developing a package that utilizes circular lists, I ran
> into a bug when trying to describe-variable
> a variable that contains circular lists. I've hewed it down to the
> following:
>
> ** Minimal Reproducible Case
>
> #+begin_src emacs-lisp :results raw h replace
> (condition-case-unless-debug err
> (with-temp-buffer
> (insert "(#9=() :key val)")
> (pp-buffer)
> nil)
It doesn't fail if the buffer is changed to emacs-lisp-mode before the
pp-buffer call. I guess scan-sexps doesn't handle the #N= correctly
unless the syntax-table has been set for emacs-lisp. I note that
pp-to-string does some setup on its temp buffer, so maybe
describe-variable needs to do that too.
For the record, to reproduce the error from describe-variable, a
slightly less minimal example is needed (because the value must be more
than 68 characters long to trigger pretty printing)
(setq vv '(#1=(a b) :key val #1# :key val :key val :key val :key val))
(describe-variable 'vv)
^ permalink raw reply [flat|nested] 6+ messages in thread
* bug#39805: 28.0.50; scan-sexps (scan_lists) incorrectly parsing circular list
2020-02-27 1:38 ` Noam Postavsky
@ 2020-02-27 17:22 ` No Wayman
2020-02-28 2:34 ` Noam Postavsky
0 siblings, 1 reply; 6+ messages in thread
From: No Wayman @ 2020-02-27 17:22 UTC (permalink / raw)
To: Noam Postavsky; +Cc: 39805
Noam Postavsky <npostavs@gmail.com> writes:
> It doesn't fail if the buffer is changed to emacs-lisp-mode
> before the
> pp-buffer call.
In the meantime, I'd like to be able to offer the users of my
package a solution if they hit this bug.
This seems to work for me, but I haven't written much, and am a
bit leery of, elisp advice.
Would you consider this an appropriate workaround?:
(defun workaround/describe-variable-print-bug (original-function
&rest args)
"Put temp buffer in emacs-lisp before ORIGINAL-FUNCTION:
`pp-buffer'.
https://lists.gnu.org/archive/html/emacs-bug-tracker/2020-02/msg00376.html"
(cl-flet ((pp-advice (original-function)
(when (string-prefix-p " *temp"
(buffer-name))
(let ((mm major-mode))
(emacs-lisp-mode)
(funcall original-function)
(funcall mm)))))
(advice-add #'pp-buffer :around #'pp-advice)
(unwind-protect
(progn
(apply original-function args)
nil)
(advice-remove #'pp-buffer #'pp-advice))))
(advice-add #'describe-variable :around
#'workaround/describe-variable-print-bug)
^ permalink raw reply [flat|nested] 6+ messages in thread
* bug#39805: 28.0.50; scan-sexps (scan_lists) incorrectly parsing circular list
2020-02-27 17:22 ` No Wayman
@ 2020-02-28 2:34 ` Noam Postavsky
2020-02-28 4:01 ` No Wayman
2020-03-04 3:09 ` Noam Postavsky
0 siblings, 2 replies; 6+ messages in thread
From: Noam Postavsky @ 2020-02-28 2:34 UTC (permalink / raw)
To: No Wayman; +Cc: 39805
[-- Attachment #1: Type: text/plain, Size: 634 bytes --]
retitle 39805 describe-variable fails to print some circular list values
# describe-variable only fails starting from 26.1
notfound 39805 25.3
found 39805 26.1
tags 39805 + patch
quit
For the record, the pp-buffer call in the original report fails in Emacs
25 (and earlier, I assume), but the describe-variable case only fails
starting from 26.1, specifically commit 2c18969c81.
[1: 2c18969c81]: 2017-03-02 02:08:32 -0500
* lisp/help-fns.el (describe-variable): Use cl-print for the value
https://git.savannah.gnu.org/cgit/emacs.git/commit/?id=2c18969c810f338d73beda592ee5af7103132e97
Here is the patch intended for emacs-27:
[-- Warning: decoded text below may be mangled, UTF-8 assumed --]
[-- Attachment #2: patch --]
[-- Type: text/x-diff, Size: 939 bytes --]
From 3b0b1b17c59341b12a502c0ea87c6125cc445494 Mon Sep 17 00:00:00 2001
From: Noam Postavsky <npostavs@gmail.com>
Date: Thu, 27 Feb 2020 21:09:59 -0500
Subject: [PATCH] Fix describe-variable on values with circular syntax
(Bug#39805)
* lisp/help-fns.el (describe-variable): Set syntax tables before
calling pp-buffer.
---
lisp/help-fns.el | 2 ++
1 file changed, 2 insertions(+)
diff --git a/lisp/help-fns.el b/lisp/help-fns.el
index 0e2ae6b3c3..1be8e0ab08 100644
--- a/lisp/help-fns.el
+++ b/lisp/help-fns.el
@@ -1000,6 +1000,8 @@ describe-variable
(terpri)
(let ((buf (current-buffer)))
(with-temp-buffer
+ (lisp-mode-variables nil)
+ (set-syntax-table emacs-lisp-mode-syntax-table)
(insert print-rep)
(pp-buffer)
(let ((pp-buffer (current-buffer)))
--
2.11.0
[-- Attachment #3: Type: text/plain, Size: 908 bytes --]
No Wayman <iarchivedmywholelife@gmail.com> writes:
> In the meantime, I'd like to be able to offer the users of my package
> a solution if they hit this bug. This seems to work for me, but I
> haven't written much, and am a bit leery of, elisp advice. Would you
> consider this an appropriate workaround?:
Mostly yes, but IMO it's kind of over-engineered. I would do just:
(defun workaround/describe-variable-print-bug (original-function &rest args)
"Put temp buffer in emacs-lisp-mode before `pp-buffer'.
https://debbugs.gnu.org/39805#8"
(advice-add #'pp-buffer :before #'emacs-lisp-mode)
(unwind-protect
(apply original-function args)
(advice-remove #'pp-buffer #'emacs-lisp-mode)))
(when (= emacs-major-version 26) ;; Work around Bug#39805.
(advice-add #'describe-variable :around
#'workaround/describe-variable-print-bug))
^ permalink raw reply related [flat|nested] 6+ messages in thread
* bug#39805: 28.0.50; scan-sexps (scan_lists) incorrectly parsing circular list
2020-02-28 2:34 ` Noam Postavsky
@ 2020-02-28 4:01 ` No Wayman
2020-03-04 3:09 ` Noam Postavsky
1 sibling, 0 replies; 6+ messages in thread
From: No Wayman @ 2020-02-28 4:01 UTC (permalink / raw)
To: Noam Postavsky; +Cc: 39805, No Wayman
> Mostly yes, but IMO it's kind of over-engineered. I would do
> just:
>
> (defun workaround/describe-variable-print-bug
> (original-function &rest args)
> "Put temp buffer in emacs-lisp-mode before `pp-buffer'.
> https://debbugs.gnu.org/39805#8"
> (advice-add #'pp-buffer :before #'emacs-lisp-mode)
> (unwind-protect
> (apply original-function args)
> (advice-remove #'pp-buffer #'emacs-lisp-mode)))
>
> (when (= emacs-major-version 26) ;; Work around Bug#39805.
> (advice-add #'describe-variable :around
> #'workaround/describe-variable-print-bug))
I assumed mine was doing a more than it needed to.
Thanks again for the patch and the workaround.
^ permalink raw reply [flat|nested] 6+ messages in thread
* bug#39805: 28.0.50; scan-sexps (scan_lists) incorrectly parsing circular list
2020-02-28 2:34 ` Noam Postavsky
2020-02-28 4:01 ` No Wayman
@ 2020-03-04 3:09 ` Noam Postavsky
1 sibling, 0 replies; 6+ messages in thread
From: Noam Postavsky @ 2020-03-04 3:09 UTC (permalink / raw)
To: No Wayman; +Cc: 39805
tags 39805 fixed
close 39805 27.1
quit
Noam Postavsky <npostavs@gmail.com> writes:
> Subject: [PATCH] Fix describe-variable on values with circular syntax
> (Bug#39805)
>
> * lisp/help-fns.el (describe-variable): Set syntax tables before
> calling pp-buffer.
Pushed to emacs-27.
[1: 7cafbbe964]: 2020-03-03 22:04:48 -0500
Fix describe-variable on values with circular syntax (Bug#39805)
https://git.savannah.gnu.org/cgit/emacs.git/commit/?id=7cafbbe96434ef616abfef364d82f7250bffc1ed
^ permalink raw reply [flat|nested] 6+ messages in thread
end of thread, other threads:[~2020-03-04 3:09 UTC | newest]
Thread overview: 6+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2020-02-26 21:33 bug#39805: 28.0.50; scan-sexps (scan_lists) incorrectly parsing circular list No Wayman
2020-02-27 1:38 ` Noam Postavsky
2020-02-27 17:22 ` No Wayman
2020-02-28 2:34 ` Noam Postavsky
2020-02-28 4:01 ` No Wayman
2020-03-04 3:09 ` Noam Postavsky
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