GNU bug report logs - #49060
Python-mode sporadically stops recognising single quote '-strings

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Package: emacs;

Reported by: Konstantin Kharlamov <hi-angel <at> yandex.ru>

Date: Wed, 16 Jun 2021 10:57:02 UTC

Severity: normal

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Report forwarded to bug-gnu-emacs <at> gnu.org:
bug#49060; Package emacs. (Wed, 16 Jun 2021 10:57:02 GMT) Full text and rfc822 format available.

Acknowledgement sent to Konstantin Kharlamov <hi-angel <at> yandex.ru>:
New bug report received and forwarded. Copy sent to bug-gnu-emacs <at> gnu.org. (Wed, 16 Jun 2021 10:57:02 GMT) Full text and rfc822 format available.

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

From: Konstantin Kharlamov <hi-angel <at> yandex.ru>
To: bug-gnu-emacs <at> gnu.org
Subject: Python-mode sporadically stops recognising single quote '-strings
Date: Wed, 16 Jun 2021 13:55:51 +0300
[Message part 1 (text/plain, inline)]
Given a python code like `foo = 'text'`, python-mode sometimes starts thinking the content inside single quotes is a code, and rather than apply font-lock-string-face to it, it starts applying various code fontifications.

It's an old bug, I think I've seen it for an year or more. Unfortunately, I never found steps to reproduce it, which is ultimately why I never reported it. It just spontaneously happens inside some python buffer, sometimes following days of using it, with no visible trigger. The only way to fix it AFAIK is to close the buffer, and reopen the file anew.

I'm hoping someone might give hints for debugging that. Perhaps, is there anything useful I can look into, once that problem appears?

I attached a screenshot of the bug, and it can also be viewed online at https://i.imgur.com/6H105Ob.png In the screenshot, on the left is a normal buffer, and on the right is one where the bug got triggered, both buffers has same content (ignore identifiers highlight, that's color-identifiers-mode).

As you can see, double-quote strings are unaffected. I tried finding the difference between processing single and double quote strings in python.el, but found none. At this point I have no idea what could be causing it.

Emacs version: master built from `f572735c51:       Fix the etags test suite` with one malloc_trim() commit on top. Below is an information from M-x report-emacs-bug

--------------

In GNU Emacs 28.0.50 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.24.29, cairo
version 1.17.4)
 of 2021-05-18 built on constantine-N61Ja
Repository revision: 222269b33e841a1909bfadc7e21da084e50ed4ff
Repository branch: master
Windowing system distributor 'The X.Org Foundation', version 11.0.12011000
System Description: Arch Linux

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=gtk3 --without-xaw3d
 --without-compress-install
 '--program-transform-name=s/\([ec]tags\)/\1.emacs/' 'CFLAGS=-flto=2
 -march=native -O3 -pipe -fno-stack-protector -fweb
 -fmerge-all-constants -fno-plt -fcommon -flto -fuse-linker-plugin -flto
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 -fmerge-all-constants -floop-nest-optimize -Wl,--sort-common,-z,relro
 -fno-plt -fcommon''

Configured features:
ACL CAIRO DBUS FREETYPE GIF GLIB GMP GNUTLS GPM HARFBUZZ JPEG JSON LCMS2
LIBOTF LIBSYSTEMD LIBXML2 M17N_FLT MODULES NOTIFY INOTIFY PDUMPER PNG
RSVG SECCOMP SOUND THREADS TIFF TOOLKIT_SCROLL_BARS X11 XDBE XIM XPM
GTK3 ZLIB

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

Major mode: Python

Minor modes in effect:
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  lsp-modeline-workspace-status-mode: t
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  font-lock-mode: t
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  auto-composition-mode: t
  auto-encryption-mode: t
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  line-number-mode: t
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Load-path shadows:
/home/constantine/.emacs.d/lisp/idomenu hides
/home/constantine/.emacs.d/elpa/idomenu-20141123.1320/idomenu
/home/constantine/.emacs.d/lisp/popup hides
/home/constantine/.emacs.d/elpa/popup-20160709.729/popup
/home/constantine/.emacs.d/elpa/cmake-mode-20180104.1137/cmake-mode hides
/usr/share/emacs/site-lisp/cmake-mode
/home/constantine/.emacs.d/elpa/transient-20201114.1825/transient hides
/usr/share/emacs/28.0.50/lisp/transient

Features:
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lsp-solargraph lsp-rust lsp-rf lsp-r lsp-purescript lsp-pyls lsp-pwsh
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Memory information:
((conses 16 833973 402991)
 (symbols 48 50378 1)
 (strings 32 235267 26373)
 (string-bytes 1 6628245)
 (vectors 16 104698)
 (vector-slots 8 2468565 767967)
 (floats 8 351 1239)
 (intervals 56 50806 1258)
 (buffers 992 80))

[6H105Ob.png (image/png, attachment)]

Information forwarded to bug-gnu-emacs <at> gnu.org:
bug#49060; Package emacs. (Thu, 05 Aug 2021 14:36:02 GMT) Full text and rfc822 format available.

Message #8 received at 49060 <at> debbugs.gnu.org (full text, mbox):

From: Konstantin Kharlamov <hi-angel <at> yandex.ru>
To: 49060 <at> debbugs.gnu.org
Subject: Re: bug#49060: Acknowledgement (Python-mode sporadically stops
 recognising single quote '-strings)
Date: Thu, 05 Aug 2021 17:35:43 +0300
I allocated some time to this problem today. To no avail, but commenting here just not to repeat this work next time:

1. python-mode is derived from prog-mode, but the latter has no code for working with single quotes nor has any mention of string-face. So the problem is unlikely to be there.
2. I did lots of editing in attempts to trigger the bug. Specifically, I was creating single-quoted strings and f-strings; first manually, then with a keyboard macro. Again, I couldn't trigger it.
    That makes me thinking, the problem may be some race condition of python fontification with another mode. Although, even if that been true, I don't get why would that influence the whole file. It would likely have been local damage, which could've been fixed by adding another singular quote, thus forcing refontification. So, I'm not sure that theory really holds up.

> Perhaps, is there anything useful I can look into, once that problem appears?

Next time it happens, gotta add debug prints to `python--font-lock-f-strings` function, and see the difference between its execution in the file when the problem is triggered compared to when it's not.






This bug report was last modified 2 years and 236 days ago.

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