* bug#31727: 25.3; format-spec clobbers match data
@ 2018-06-05 17:30 Ryan Thompson
2018-06-05 17:39 ` Noam Postavsky
0 siblings, 1 reply; 5+ messages in thread
From: Ryan Thompson @ 2018-06-05 17:30 UTC (permalink / raw)
To: 31727
[-- Attachment #1: Type: text/plain, Size: 32375 bytes --]
The following code throws an error:
(progn
(string-match "h.*o" "hello")
(format-spec "This sets the %s" (format-spec-make ?s "match data"))
(match-string 0 "hello"))
This is because the implementation of "format-spec" uses regular
expressions internally, and does not save the match data and restore it
afterward.
In GNU Emacs 25.3.2 (x86_64-pc-linux-gnu, GTK+ Version 3.18.9)
of 2017-09-12 built on lcy01-32
Windowing system distributor 'The X.Org Foundation', version 11.0.11804000
System Description: Ubuntu 16.04.3 LTS
Configured using:
'configure --build=x86_64-linux-gnu --prefix=/usr
'--includedir=${prefix}/include' '--mandir=${prefix}/share/man'
'--infodir=${prefix}/share/info' --sysconfdir=/etc --localstatedir=/var
--disable-silent-rules '--libdir=${prefix}/lib/x86_64-linux-gnu'
'--libexecdir=${prefix}/lib/x86_64-linux-gnu' --disable-maintainer-mode
--disable-dependency-tracking --prefix=/usr --sharedstatedir=/var/lib
--program-suffix=25 --with-modules --with-x=yes --with-x-toolkit=gtk3
'CFLAGS=-g -O2 -fstack-protector-strong -Wformat
-Werror=format-security' 'CPPFLAGS=-Wdate-time -D_FORTIFY_SOURCE=2'
'LDFLAGS=-Wl,-Bsymbolic-functions -Wl,-z,relro''
Configured features:
XPM JPEG TIFF GIF PNG RSVG IMAGEMAGICK SOUND GPM DBUS GCONF GSETTINGS
NOTIFY LIBSELINUX GNUTLS LIBXML2 FREETYPE M17N_FLT LIBOTF XFT ZLIB
TOOLKIT_SCROLL_BARS GTK3 X11 MODULES
Important settings:
value of $LC_COLLATE: en_US.UTF-8
value of $LC_CTYPE: en_US.UTF-8
value of $LC_MESSAGES: en_US.UTF-8
value of $LANG: en_US.UTF-8
value of $XMODIFIERS: @im=ibus
locale-coding-system: utf-8-unix
Major mode: Lisp Interaction
Minor modes in effect:
recentf-mode: t
magit-auto-revert-mode: t
global-git-commit-mode: t
async-bytecomp-package-mode: t
diff-auto-refine-mode: t
rainbow-delimiters-mode: t
pretty-symbols-mode: t
lexbind-mode: t
highlight-defined-mode: t
shell-dirtrack-mode: t
editorconfig-mode: t
global-auto-complete-mode: t
auto-complete-mode: t
adjust-parens-mode: t
ws-butler-global-mode: t
ws-butler-mode: t
winner-mode: t
which-key-mode: t
which-function-mode: t
volatile-highlights-mode: t
sml-modeline-mode: t
savehist-mode: t
save-place-mode: t
minibuffer-electric-default-mode: t
minibuffer-depth-indicate-mode: t
midnight-mode: t
ido-yes-or-no-mode: t
ido-ubiquitous-mode: t
ido-complete-space-or-hyphen-mode: t
icomplete-mode: t
highlight-stages-global-mode: t
highlight-stages-mode: t
global-undo-tree-mode: t
undo-tree-mode: t
global-pointback-mode: t
pointback-mode: t
global-hl-line-mode: t
global-anzu-mode: t
anzu-mode: t
desktop-save-mode: t
delete-selection-mode: t
beacon-mode: t
bar-cursor-mode: t
autopair-global-mode: t
autopair-mode: t
show-paren-mode: t
auto-dim-other-buffers-mode: t
amx-mode: t
ido-everywhere: t
override-global-mode: t
tooltip-mode: t
global-eldoc-mode: t
eldoc-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
auto-composition-mode: t
auto-encryption-mode: t
auto-compression-mode: t
line-number-mode: t
transient-mark-mode: t
Recent messages:
Mark set
Entering debugger...
Back to top level
((115 . "match data"))
"This sets the match data"
Entering debugger...
Back to top level
Mark set [2 times]
Indenting region...done
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org-bbdb org-w3m flymake ess-toolbar ess-mouse mouseme ess-swv ess-noweb
ess-noweb-font-lock-mode ess-bugs-l ess-sas-d ess-sas-l ess-sas-a
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ess-sp6-d ess-dde ess-sp3-d ess-julia julia-mode ess-r-mode
ess-r-package ess-r-syntax ess-r-completion ess-roxy essddr ess-rd
hideshow ess-s-lang ess-help ess-site autorevert filenotify vc-git
diff-mode editorconfig-core editorconfig-core-handle
editorconfig-fnmatch server emacsbug message rfc822 mml mml-sec epg
mailabbrev gmm-utils mailheader sendmail mail-utils yaml-mode
with-simulated-input tempbuf system-specific-settings snakemake-mode
python tramp-sh smooth-scrolling slime arc-mode archive-mode hyperspec
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ess-tracebug compile ess-generics ess-utils cl ess-custom executable
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env code-pages mule custom widget hashtable-print-readable backquote
dbusbind inotify dynamic-setting system-font-setting font-render-setting
move-toolbar gtk x-toolkit x multi-tty make-network-process emacs)
Memory information:
((conses 16 1078179 128814)
(symbols 48 55161 0)
(miscs 40 6908 2768)
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(string-bytes 1 4934592)
(vectors 16 81854)
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^ permalink raw reply [flat|nested] 5+ messages in thread
* bug#31727: 25.3; format-spec clobbers match data
2018-06-05 17:30 bug#31727: 25.3; format-spec clobbers match data Ryan Thompson
@ 2018-06-05 17:39 ` Noam Postavsky
2018-06-05 17:49 ` Ryan Thompson
2018-06-06 21:30 ` Richard Stallman
0 siblings, 2 replies; 5+ messages in thread
From: Noam Postavsky @ 2018-06-05 17:39 UTC (permalink / raw)
To: Ryan Thompson; +Cc: 31727
On 5 June 2018 at 13:30, Ryan Thompson <rct@thompsonclan.org> wrote:
>
> The following code throws an error:
>
> (progn
> (string-match "h.*o" "hello")
> (format-spec "This sets the %s" (format-spec-make ?s "match data"))
> (match-string 0 "hello"))
>
> This is because the implementation of "format-spec" uses regular
> expressions internally, and does not save the match data and restore it
> afterward.
(elisp) Match Data:
Notice that all functions are allowed to overwrite the match data
unless they’re explicitly documented not to do so.
^ permalink raw reply [flat|nested] 5+ messages in thread
* bug#31727: 25.3; format-spec clobbers match data
2018-06-05 17:39 ` Noam Postavsky
@ 2018-06-05 17:49 ` Ryan Thompson
2018-06-05 22:30 ` Noam Postavsky
2018-06-06 21:30 ` Richard Stallman
1 sibling, 1 reply; 5+ messages in thread
From: Ryan Thompson @ 2018-06-05 17:49 UTC (permalink / raw)
To: Noam Postavsky; +Cc: 31727
[-- Attachment #1: Type: text/plain, Size: 831 bytes --]
On Tue, Jun 5, 2018 at 10:39 AM Noam Postavsky <npostavs@gmail.com> wrote:
> On 5 June 2018 at 13:30, Ryan Thompson <rct@thompsonclan.org> wrote:
> >
> > The following code throws an error:
> >
> > (progn
> > (string-match "h.*o" "hello")
> > (format-spec "This sets the %s" (format-spec-make ?s "match data"))
> > (match-string 0 "hello"))
> >
> > This is because the implementation of "format-spec" uses regular
> > expressions internally, and does not save the match data and restore it
> > afterward.
>
> (elisp) Match Data:
>
> Notice that all functions are allowed to overwrite the match data
> unless they’re explicitly documented not to do so.
>
Wow, I was not aware of that. This seems... really fragile. In any case, I
suppose the behavior is as documented, so you can close this bug.
[-- Attachment #2: Type: text/html, Size: 1282 bytes --]
^ permalink raw reply [flat|nested] 5+ messages in thread
* bug#31727: 25.3; format-spec clobbers match data
2018-06-05 17:49 ` Ryan Thompson
@ 2018-06-05 22:30 ` Noam Postavsky
0 siblings, 0 replies; 5+ messages in thread
From: Noam Postavsky @ 2018-06-05 22:30 UTC (permalink / raw)
To: Ryan Thompson; +Cc: 31727
tags 31727 notabug
close 31727
quit
Ryan Thompson <rct@thompsonclan.org> writes:
>> (elisp) Match Data:
>>
>> Notice that all functions are allowed to overwrite the match data
>> unless they’re explicitly documented not to do so.
>>
>
> Wow, I was not aware of that. This seems... really fragile.
And yet, it usually works :)
> In any case, I suppose the behavior is as documented, so you can close
> this bug.
Done.
^ permalink raw reply [flat|nested] 5+ messages in thread
* bug#31727: 25.3; format-spec clobbers match data
2018-06-05 17:39 ` Noam Postavsky
2018-06-05 17:49 ` Ryan Thompson
@ 2018-06-06 21:30 ` Richard Stallman
1 sibling, 0 replies; 5+ messages in thread
From: Richard Stallman @ 2018-06-06 21:30 UTC (permalink / raw)
To: Noam Postavsky; +Cc: rct, 31727
[[[ To any NSA and FBI agents reading my email: please consider ]]]
[[[ whether defending the US Constitution against all enemies, ]]]
[[[ foreign or domestic, requires you to follow Snowden's example. ]]]
Since 'format' does not clobber the match data,
I think users will expect 'format-spec' to behave likewise.
So I think we should fix it to preserve the match data,
one way or another.
That is the choice that makes Emacs simpler to program for.
--
Dr Richard Stallman
President, Free Software Foundation (https://gnu.org, https://fsf.org)
Internet Hall-of-Famer (https://internethalloffame.org)
^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2018-06-06 21:30 UTC | newest]
Thread overview: 5+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2018-06-05 17:30 bug#31727: 25.3; format-spec clobbers match data Ryan Thompson
2018-06-05 17:39 ` Noam Postavsky
2018-06-05 17:49 ` Ryan Thompson
2018-06-05 22:30 ` Noam Postavsky
2018-06-06 21:30 ` Richard Stallman
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