GNU bug report logs - #70356
30.0.50; [wishlist] Expose UTF-8 parse error to Lisp

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

From: Michael Albinus <michael.albinus <at> gmx.de>
To: bug-gnu-emacs <at> gnu.org
Subject: 30.0.50; [wishlist] Expose UTF-8 parse error to Lisp
Date: Fri, 12 Apr 2024 17:59:08 +0200

json_parse_string checks for a valid UTF-8 byte sequence, and raises an
error in case of. It would be useful, if this error handling would be
exposed to Lisp. For example, it could be used to check a D-Bus
byte-array for proper UTF-8 syntax in dbus-byte-array-to-string.


In GNU Emacs 30.0.50 (build 1, x86_64-pc-linux-gnu, GTK+ Version
 3.24.41, cairo version 1.18.0) of 2024-04-07 built on gandalf
Repository revision: 8ee1dc8f1f9aa47260f8151c9eea30fb1ccf878a
Repository branch: master
Windowing system distributor 'The X.Org Foundation', version 11.0.12302004
System Description: Fedora Linux 39 (Workstation Edition)

Configured features:
ACL CAIRO DBUS FREETYPE GIF GLIB GMP GNUTLS GPM GSETTINGS HARFBUZZ JPEG
LIBOTF LIBSELINUX LIBXML2 M17N_FLT MODULES NATIVE_COMP NOTIFY INOTIFY
PDUMPER PNG RSVG SECCOMP SOUND SQLITE3 THREADS TIFF TOOLKIT_SCROLL_BARS
TREE_SITTER X11 XDBE XIM XINPUT2 XPM GTK3 ZLIB

Important settings:
  value of $LANG: en_US.UTF-8
  value of $XMODIFIERS: @im=ibus
  locale-coding-system: utf-8

Major mode: Group

Minor modes in effect:
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  column-number-mode: t
  line-number-mode: t
  indent-tabs-mode: t
  transient-mark-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t

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/home/albinus/.emacs.d/elpa/org-9.6.25/ob-js hides /usr/local/share/emacs/30.0.50/lisp/org/ob-js
/home/albinus/.emacs.d/elpa/org-9.6.25/org-version hides /usr/local/share/emacs/30.0.50/lisp/org/org-version
/home/albinus/.emacs.d/elpa/org-9.6.25/org-colview hides /usr/local/share/emacs/30.0.50/lisp/org/org-colview
/home/albinus/.emacs.d/elpa/org-9.6.25/org-entities hides /usr/local/share/emacs/30.0.50/lisp/org/org-entities
/home/albinus/.emacs.d/elpa/org-9.6.25/ol-eww hides /usr/local/share/emacs/30.0.50/lisp/org/ol-eww
/home/albinus/.emacs.d/elpa/org-9.6.25/org-id hides /usr/local/share/emacs/30.0.50/lisp/org/org-id
/home/albinus/.emacs.d/elpa/org-9.6.25/ol-irc hides /usr/local/share/emacs/30.0.50/lisp/org/ol-irc
/home/albinus/.emacs.d/elpa/org-9.6.25/ob-octave hides /usr/local/share/emacs/30.0.50/lisp/org/ob-octave
~/lisp/dbus hides /usr/local/share/emacs/30.0.50/lisp/net/dbus
/home/albinus/src/tramp/lisp/tramp-sh hides /usr/local/share/emacs/30.0.50/lisp/net/tramp-sh
/home/albinus/src/tramp/lisp/tramp-fuse hides /usr/local/share/emacs/30.0.50/lisp/net/tramp-fuse
/home/albinus/src/tramp/lisp/tramp-androidsu hides /usr/local/share/emacs/30.0.50/lisp/net/tramp-androidsu
/home/albinus/src/tramp/lisp/tramp-loaddefs hides /usr/local/share/emacs/30.0.50/lisp/net/tramp-loaddefs
/home/albinus/src/tramp/lisp/tramp-ftp hides /usr/local/share/emacs/30.0.50/lisp/net/tramp-ftp
/home/albinus/src/tramp/lisp/tramp hides /usr/local/share/emacs/30.0.50/lisp/net/tramp
/home/albinus/src/tramp/lisp/tramp-cache hides /usr/local/share/emacs/30.0.50/lisp/net/tramp-cache
/home/albinus/src/tramp/lisp/tramp-uu hides /usr/local/share/emacs/30.0.50/lisp/net/tramp-uu
/home/albinus/src/tramp/lisp/tramp-rclone hides /usr/local/share/emacs/30.0.50/lisp/net/tramp-rclone
/home/albinus/src/tramp/lisp/tramp-integration hides /usr/local/share/emacs/30.0.50/lisp/net/tramp-integration
/home/albinus/src/tramp/lisp/tramp-archive hides /usr/local/share/emacs/30.0.50/lisp/net/tramp-archive
/home/albinus/src/tramp/lisp/tramp-adb hides /usr/local/share/emacs/30.0.50/lisp/net/tramp-adb
/home/albinus/src/tramp/lisp/tramp-cmds hides /usr/local/share/emacs/30.0.50/lisp/net/tramp-cmds
/home/albinus/src/tramp/lisp/tramp-compat hides /usr/local/share/emacs/30.0.50/lisp/net/tramp-compat
/home/albinus/src/tramp/lisp/tramp-sudoedit hides /usr/local/share/emacs/30.0.50/lisp/net/tramp-sudoedit
/home/albinus/src/tramp/lisp/tramp-container hides /usr/local/share/emacs/30.0.50/lisp/net/tramp-container
/home/albinus/src/tramp/lisp/tramp-gvfs hides /usr/local/share/emacs/30.0.50/lisp/net/tramp-gvfs
/home/albinus/src/tramp/lisp/tramp-crypt hides /usr/local/share/emacs/30.0.50/lisp/net/tramp-crypt
/home/albinus/src/tramp/lisp/tramp-message hides /usr/local/share/emacs/30.0.50/lisp/net/tramp-message
/home/albinus/src/tramp/lisp/tramp-smb hides /usr/local/share/emacs/30.0.50/lisp/net/tramp-smb
/home/albinus/src/tramp/lisp/trampver hides /usr/local/share/emacs/30.0.50/lisp/net/trampver
/home/albinus/src/tramp/lisp/tramp-sshfs hides /usr/local/share/emacs/30.0.50/lisp/net/tramp-sshfs
/home/albinus/.emacs.d/elpa/faceup-20170925.1946/faceup hides /usr/local/share/emacs/30.0.50/lisp/emacs-lisp/faceup

Features:
(shadow comp-run emacsbug shr-color url-queue mailalias whitespace
log-edit smerge-mode diff flow-fill pop3 utf-7 nndraft nnmh nnml nnnil
smtpmail sort smiley gnus-cite mail-extr textsec uni-scripts
idna-mapping ucs-normalize uni-confusable textsec-check qp gnus-async
gnus-bcklg gnus-agent gnus-srvr gnus-score score-mode nnvirtual nntp
gnus-ml gnus-msg disp-table nndoc gnus-cache gnus-dup gnus-art mm-uu
mml2015 mm-view mml-smime smime dig gnus-sum shr pixel-fill kinsoku
url-file svg dom gnus-group gnus-undo gnus-start gnus-dbus gnus-cloud
nnimap nnmail mail-source utf7 nnoo gnus-spec gnus-int gnus-range
gnus-win gnus nnheader range mm-archive message sendmail yank-media
rfc822 mml mml-sec epa derived epg rfc6068 epg-config gnus-util
mailabbrev gmm-utils mailheader mail-utils gnutls network-stream
url-cache crm debbugs-gnu debbugs-compat debbugs soap-client mm-decode
mm-bodies mm-encode url-http url-auth mail-parse rfc2231 rfc2047 rfc2045
mm-util ietf-drums mail-prsvr url-gw nsm puny warnings rng-xsd rng-dt
rng-util xsd-regexp emacs-news-mode noutline outline dbus xml mule-util
texinfo texinfo-loaddefs add-log macrostep-c cmacexp macrostep cc-mode
cc-fonts cc-guess cc-menus cc-cmds cc-styles cc-align cc-engine cc-vars
cc-defs pulse color find-dired xref project grep display-line-numbers
cl-print debug backtrace find-func dired-aux time-stamp ediff-vers ediff
ediff-merg ediff-mult ediff-wind ediff-diff ediff-help ediff-init
ediff-util shortdoc comp-common help-fns radix-tree misearch
multi-isearch debbugs-browse bug-reference cl-extra compile
text-property-search vc-hg vc-git diff-mode vc-bzr vc-src vc-sccs vc-svn
vc-cvs vc-rcs log-view easy-mmode pcvs-util vc-dir ewoc face-remap
ob-shell ob ob-tangle ol org-src ob-ref ob-lob ob-table ob-exp ob-comint
ob-core org-cycle org-fold org-fold-core ob-eval org-keys oc org-compat
org-version org-macs vc vc-dispatcher time tramp-sh lxc-tramp lxd-tramp
tramp trampver tramp-integration files-x tramp-message help-mode
tramp-compat xdg shell pcomplete comint ansi-osc ring parse-time iso8601
time-date format-spec ansi-color tramp-loaddefs rx delsel ido jka-compr
icomplete cus-edit pp cus-load wid-edit dired dired-loaddefs goto-addr
thingatpt alert-autoloads android-mode-autoloads
auth-source-gopass-autoloads auth-source-keytar-autoloads
auth-source-kwallet-autoloads auth-source-xoauth2-autoloads
auto-sudoedit-autoloads auto-virtualenv-autoloads
auto-virtualenvwrapper-autoloads boxquote-autoloads
clang-format-autoloads company-shell-autoloads company-autoloads
counsel-toki-autoloads counsel-tramp-autoloads counsel-autoloads
dbus-codegen-autoloads debbugs-autoloads dired-du-autoloads
dired-rsync-autoloads dired-toggle-sudo-autoloads direnv-autoloads
disk-usage-autoloads dockerfile-mode-autoloads
editorconfig-charset-extras-autoloads
editorconfig-custom-majormode-autoloads
editorconfig-domain-specific-autoloads editorconfig-autoloads
editorconfig-generate-autoloads ednc-autoloads el-get-autoloads
envrc-autoloads etc-sudoers-mode-autoloads
exec-path-from-shell-autoloads faceup-autoloads fontaine-autoloads
forge-autoloads closql-autoloads emacsql-autoloads
friendly-tramp-path-autoloads fzf-autoloads ggtags-autoloads
ghub-autoloads gited-autoloads gitlab-ci-mode-flycheck-autoloads
gitlab-ci-mode-autoloads flycheck-autoloads gntp-autoloads
helm-gitlab-autoloads helm-projectile-autoloads helm-autoloads
helm-core-autoloads async-autoloads ibuffer-tramp-autoloads
inheritenv-autoloads ivy-gitlab-autoloads gitlab-autoloads
journalctl-mode-autoloads keepass-mode-autoloads keytar-autoloads
kubernetes-autoloads log4e-autoloads lsp-java-autoloads
dap-mode-autoloads lsp-docker-autoloads bui-autoloads
lsp-latex-autoloads consult-autoloads lsp-treemacs-autoloads
lsp-mode-autoloads f-autoloads lxc-tramp-autoloads lxd-tramp-autoloads
magit-filenotify-autoloads magit-autoloads pcase git-commit-autoloads
magit-popup-autoloads magit-section-autoloads marcopolo-autoloads
mastodon-autoloads nexus-autoloads oauth2-autoloads
ob-restclient-autoloads orderless-autoloads org-autoloads
password-menu-autoloads persist-autoloads pkg-info-autoloads
epl-autoloads popup-autoloads projectile-autoloads promise-autoloads
pylint-autoloads python-environment-autoloads deferred-autoloads
pyvenv-autoloads recentf-remove-sudo-tramp-prefix-autoloads
request-autoloads restclient-test-autoloads restclient-autoloads
s3ed-autoloads shell-maker-autoloads finder-inf slime-autoloads
macrostep-autoloads spinner-autoloads ssh-deploy-autoloads su-autoloads
sudo-edit-autoloads sudo-ext-autoloads sudo-utils-autoloads
swiper-autoloads ivy-autoloads sx-autoloads markdown-mode-autoloads
telepathy-autoloads totp-autoloads totp-auth-autoloads base32-autoloads
tramp-theme-autoloads transient-dwim-autoloads transient-autoloads
treemacs-autoloads cfrs-autoloads posframe-autoloads ht-autoloads
pfuture-autoloads ace-window-autoloads avy-autoloads treepy-autoloads
uuid-autoloads vdiff-autoloads hydra-autoloads lv-autoloads
vertico-autoloads virtualenv-autoloads virtualenvwrapper-autoloads
s-autoloads dash-autoloads web-server-autoloads wfnames-autoloads info
with-editor-autoloads yaml-autoloads yaml-mode-autoloads package
browse-url url url-proxy url-privacy url-expand url-methods url-history
url-cookie generate-lisp-file url-domsuf url-util mailcap url-handlers
url-parse auth-source cl-seq eieio eieio-core cl-macs icons
password-cache json subr-x map byte-opt gv bytecomp byte-compile
url-vars cl-loaddefs cl-lib rmc iso-transl tooltip cconv eldoc paren
electric uniquify ediff-hook vc-hooks lisp-float-type elisp-mode mwheel
term/x-win x-win term/common-win x-dnd touch-screen tool-bar dnd fontset
image regexp-opt fringe tabulated-list replace newcomment text-mode
lisp-mode prog-mode register page tab-bar menu-bar rfn-eshadow isearch
easymenu timer select scroll-bar mouse jit-lock font-lock syntax
font-core term/tty-colors frame minibuffer nadvice seq simple cl-generic
indonesian philippine cham georgian utf-8-lang misc-lang vietnamese
tibetan thai tai-viet lao korean japanese eucjp-ms cp51932 hebrew greek
romanian slovak czech european ethiopic indian cyrillic chinese
composite emoji-zwj charscript charprop case-table epa-hook
jka-cmpr-hook help abbrev obarray oclosure cl-preloaded button loaddefs
theme-loaddefs faces cus-face macroexp files window text-properties
overlay sha1 md5 base64 format env code-pages mule custom widget keymap
hashtable-print-readable backquote threads dbusbind inotify
dynamic-setting system-font-setting font-render-setting cairo gtk
x-toolkit xinput2 x multi-tty move-toolbar make-network-process
native-compile emacs)

Memory information:
((conses 16 739215 210867)
 (symbols 48 31263 3)
 (strings 32 131292 11556)
 (string-bytes 1 4075180)
 (vectors 16 76367)
 (vector-slots 8 1773982 93652)
 (floats 8 630 21596)
 (intervals 56 26858 2075)
 (buffers 992 32))

Message #8 received at 70356 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Michael Albinus <michael.albinus <at> gmx.de>
Cc: 70356 <at> debbugs.gnu.org
Subject: Re: bug#70356: 30.0.50; [wishlist] Expose UTF-8 parse error to Lisp
Date: Fri, 12 Apr 2024 21:22:36 +0300

> Date: Fri, 12 Apr 2024 17:59:08 +0200
> From:  Michael Albinus via "Bug reports for GNU Emacs,
>  the Swiss army knife of text editors" <bug-gnu-emacs <at> gnu.org>
> 
> 
> json_parse_string checks for a valid UTF-8 byte sequence, and raises an
> error in case of. It would be useful, if this error handling would be
> exposed to Lisp. For example, it could be used to check a D-Bus
> byte-array for proper UTF-8 syntax in dbus-byte-array-to-string.

Sorry, I don't understand: errors we signal are always "exposed to
Lisp": e.g., your program could catch the error and do whatever it
wants.  What exactly is missing?

Message #11 received at 70356 <at> debbugs.gnu.org (full text, mbox):

From: Michael Albinus <michael.albinus <at> gmx.de>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 70356 <at> debbugs.gnu.org
Subject: Re: bug#70356: 30.0.50; [wishlist] Expose UTF-8 parse error to Lisp
Date: Sat, 13 Apr 2024 09:24:37 +0200

Eli Zaretskii <eliz <at> gnu.org> writes:

Hi Eli,

>> json_parse_string checks for a valid UTF-8 byte sequence, and raises an
>> error in case of. It would be useful, if this error handling would be
>> exposed to Lisp. For example, it could be used to check a D-Bus
>> byte-array for proper UTF-8 syntax in dbus-byte-array-to-string.
>
> Sorry, I don't understand: errors we signal are always "exposed to
> Lisp": e.g., your program could catch the error and do whatever it
> wants.  What exactly is missing?

I'm not interested in JSON here. I've mentioned json_parse_string
because it contains the functionality I'm looking for.

What I'd like to get is a function, which takes a sequence of bytes as
arguments, and which indicates, whether this is a valid UTF-8 byte
sequence. This indication could be an error, or a respective return
value.

Best regards, Michael.

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

From: Andreas Schwab <schwab <at> linux-m68k.org>
To: Michael Albinus via "Bug reports for GNU Emacs, the Swiss army knife of
 text editors" <bug-gnu-emacs <at> gnu.org>
Cc: Eli Zaretskii <eliz <at> gnu.org>, Michael Albinus <michael.albinus <at> gmx.de>,
 70356 <at> debbugs.gnu.org
Subject: Re: bug#70356: 30.0.50; [wishlist] Expose UTF-8 parse error to Lisp
Date: Sat, 13 Apr 2024 09:41:52 +0200

On Apr 13 2024, Michael Albinus via "Bug reports for GNU Emacs, the Swiss army knife of text editors" wrote:

> What I'd like to get is a function, which takes a sequence of bytes as
> arguments, and which indicates, whether this is a valid UTF-8 byte
> sequence. This indication could be an error, or a respective return
> value.

That function could do the decoding and then check whether the result
contains any eight-bit characters (which mark the non-decodable parts).

-- 
Andreas Schwab, schwab <at> linux-m68k.org
GPG Key fingerprint = 7578 EB47 D4E5 4D69 2510  2552 DF73 E780 A9DA AEC1
"And now for something completely different."

Message #22 received at 70356-done <at> debbugs.gnu.org (full text, mbox):

From: Michael Albinus <michael.albinus <at> gmx.de>
To: Andreas Schwab <schwab <at> linux-m68k.org>
Cc: Eli Zaretskii <eliz <at> gnu.org>, 70356-done <at> debbugs.gnu.org
Subject: Re: bug#70356: 30.0.50; [wishlist] Expose UTF-8 parse error to Lisp
Date: Sat, 13 Apr 2024 10:29:26 +0200

Andreas Schwab <schwab <at> linux-m68k.org> writes:

Hi Andreas,

>> What I'd like to get is a function, which takes a sequence of bytes as
>> arguments, and which indicates, whether this is a valid UTF-8 byte
>> sequence. This indication could be an error, or a respective return
>> value.
>
> That function could do the decoding and then check whether the result
> contains any eight-bit characters (which mark the non-decodable parts).

Hmm. Thinking about, the following code does already what I want:

(string-to-unibyte (apply #'string bytes))

Closing the bug.

Best regards, Michael.

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