GNU bug report logs - #24739
25.1; conf-mode can't handle non escaped single quotes

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

From: Diego Berrocal <cestdiego <at> gmail.com>
To: "bug-gnu-emacs <at> gnu.org" <bug-gnu-emacs <at> gnu.org>
Subject: 25.1; conf-mode can't handle non escaped single quotes
Date: Wed, 19 Oct 2016 16:37:36 +0000

[Message part 1 (text/plain, inline)]

when in conf-mode, if one property has a value that has a single
non escaped quote, then it will keep searching for the matching quote
until the end of the file, which makes next properties not able to be
font-locked

Reproduction text:

Switch to scratch buffer

M-x conf-mode

firstProperty=Hi I'm Diego
secondProperty=I have a stringquote style.

Please fix this.




In GNU Emacs 25.1.1 (x86_64-apple-darwin15.6.0, NS appkit-1404.47 Version
10.11.6 (Build 15G31))
 of 2016-08-16 built on LM-NYC-00878226
Windowing system distributor 'Apple', version 10.3.1404
Configured using:
 'configure --disable-dependency-tracking --disable-silent-rules
 --enable-locallisppath=/usr/local/share/emacs/site-lisp
 --infodir=/usr/local/Cellar/emacs-plus/25.1-rc1/share/info/emacs
 --prefix=/usr/local/Cellar/emacs-plus/25.1-rc1 --with-xml2
 --without-dbus --with-gnutls --with-rsvg --with-imagemagick --with-ns
 --disable-ns-self-contained'

Configured features:
JPEG RSVG IMAGEMAGICK NOTIFY ACL GNUTLS LIBXML2 ZLIB TOOLKIT_SCROLL_BARS
NS

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

Major mode: Conf[Unix]

Minor modes in effect:
  helm-flx-mode: t
  handoff-global-mode: t
  handoff-mode: t
  helm-descbinds-mode: t
  helm-spacemacs-help-mode: t
  company-statistics-mode: t
  yas-global-mode: t
  projectile-mode: t
  recentf-mode: t
  erc-list-mode: t
  erc-menu-mode: t
  erc-autojoin-mode: t
  erc-ring-mode: t
  erc-pcomplete-mode: t
  erc-netsplit-mode: t
  erc-log-mode: t
  erc-hl-nicks-mode: t
  erc-button-mode: t
  erc-fill-mode: t
  erc-stamp-mode: t
  erc-youtube-mode: t
  erc-match-mode: t
  erc-services-mode: t
  erc-networks-mode: t
  erc-irccontrols-mode: t
  erc-noncommands-mode: t
  erc-move-to-prompt-mode: t
  erc-readonly-mode: t
  custom-keys-mode: t
  beacon-mode: t
  global-evil-mc-mode: t
  evil-mc-mode: t
  encourage-mode: t
  company-flx-mode: t
  editorconfig-mode: t
  global-spacemacs-whitespace-cleanup-mode: t
  spacemacs-whitespace-cleanup-mode: t
  ws-butler-global-mode: t
  ws-butler-mode: t
  winner-mode: t
  window-numbering-mode: t
  volatile-highlights-mode: t
  spaceline-info-mode: t
  spaceline-helm-mode: t
  save-place-mode: t
  savehist-mode: t
  persp-mode: t
  keyfreq-autosave-mode: t
  keyfreq-mode: t
  Info-breadcrumbs-in-mode-line-mode: t
  ido-vertical-mode: t
  helm-mode: t
  global-git-gutter+-mode: t
  git-gutter+-mode: t
  global-git-commit-mode: t
  async-bytecomp-package-mode: t
  shell-dirtrack-mode: t
  flycheck-pos-tip-mode: t
  global-flycheck-mode: t
  flx-ido-mode: t
  firestarter-mode: t
  eyebrowse-mode: t
  global-evil-surround-mode: t
  evil-surround-mode: t
  global-evil-search-highlight-persist: t
  evil-search-highlight-persist: t
  show-smartparens-global-mode: t
  show-smartparens-mode: t
  evil-escape-mode: t
  global-anzu-mode: t
  anzu-mode: t
  eval-sexp-fu-flash-mode: t
  popwin-mode: t
  global-edit-server-edit-mode: t
  diff-auto-refine-mode: t
  company-quickhelp-mode: t
  clean-aindent-mode: t
  hybrid-mode: t
  which-key-mode: t
  override-global-mode: t
  global-undo-tree-mode: t
  undo-tree-mode: t
  evil-mode: t
  evil-local-mode: t
  spacemacs-leader-override-mode: t
  global-spacemacs-leader-override-mode: t
  xterm-mouse-mode: t
  global-auto-revert-mode: t
  global-page-break-lines-mode: t
  global-eldoc-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  global-prettify-symbols-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  column-number-mode: t
  line-number-mode: t
  transient-mark-mode: t

Recent messages:
evil-forward-char: End of line [15 times]
mouse-2: correct word at point
evil-line-move: End of buffer [6 times]
mouse-2: visit this file in other window [2 times]
evil-line-move: Beginning of buffer [2 times]
Quit
Error running timer ‘sp-show--pair-function’: (end-of-buffer) [2 times]
Quit [2 times]
evil-signal-at-eob: End of buffer [19 times]
evil-line-move: End of buffer

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Memory information:
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-- 
Diego Berrocal
http://cestdiego.github.io

[Message part 2 (text/html, inline)]

Message #10 received at 24739 <at> debbugs.gnu.org (full text, mbox):

From: Lars Ingebrigtsen <larsi <at> gnus.org>
To: Diego Berrocal <cestdiego <at> gmail.com>
Cc: 24739 <at> debbugs.gnu.org
Subject: Re: bug#24739: 25.1; conf-mode can't handle non escaped single quotes
Date: Sat, 27 Jul 2019 15:43:15 +0200

Diego Berrocal <cestdiego <at> gmail.com> writes:

> when in conf-mode, if one property has a value that has a single
> non escaped quote, then it will keep searching for the matching quote
> until the end of the file, which makes next properties not able to be
> font-locked
>
> Reproduction text:
>
> Switch to scratch buffer
>
> M-x conf-mode
>
> firstProperty=Hi I'm Diego
> secondProperty=I have a stringquote style.

(I'm going through older Emacs bug reports that have received no
response.)

I can confirm that this bug is still present in Emacs 27 -- everything
after the quote is in font-lock-string-face.

The confusing thing is that I can't even determine what's doing the
font-locking of that thing here.

This is the definition:

(defvar conf-font-lock-keywords
  '(;; [section] (do this first because it may look like a parameter)
    ("^[ \t]*\\[\\(.+\\)\\]" 1 'font-lock-type-face)
    ;; var=val or var[index]=val
    ("^[ \t]*\\(.+?\\)\\(?:\\[\\(.*?\\)\\]\\)?[ \t]*="
     (1 'font-lock-variable-name-face)
     (2 'font-lock-constant-face nil t))
    ;; section { ... } (do this last because some assign ...{...)
    ("^[ \t]*\\([^=:\n]+?\\)[ \t\n]*{[^{}]*?$" 1 'font-lock-type-face prepend))
  "Keywords to highlight in Conf mode.")

No font-lock-string-face in sight, and there's no mention of it in the
file.  So is this some general font-lock thing that's configured
somewhere else?  Anybody know how this stuff works?

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

Message #13 received at 24739 <at> debbugs.gnu.org (full text, mbox):

From: Noam Postavsky <npostavs <at> gmail.com>
To: Lars Ingebrigtsen <larsi <at> gnus.org>
Cc: 24739 <at> debbugs.gnu.org, Diego Berrocal <cestdiego <at> gmail.com>
Subject: Re: bug#24739: 25.1; conf-mode can't handle non escaped single quotes
Date: Sat, 27 Jul 2019 12:53:18 -0400

Lars Ingebrigtsen <larsi <at> gnus.org> writes:

>> firstProperty=Hi I'm Diego
>> secondProperty=I have a stringquote style.

> No font-lock-string-face in sight, and there's no mention of it in the
> file.  So is this some general font-lock thing that's configured
> somewhere else?  Anybody know how this stuff works?

font-lock-string-face comes from font-lock-syntactic-face-function,
because ' has string delimiter syntax in conf-mode (see
conf-mode-syntax-table).  I think it should be possible to make a
syntax-propertize rule that catches unmatched quotes and sets them to
punctuation syntax.  We do something similar in sgml-syntax-propertize.

Message #16 received at 24739 <at> debbugs.gnu.org (full text, mbox):

From: Lars Ingebrigtsen <larsi <at> gnus.org>
To: Noam Postavsky <npostavs <at> gmail.com>
Cc: 24739 <at> debbugs.gnu.org, Diego Berrocal <cestdiego <at> gmail.com>
Subject: Re: bug#24739: 25.1; conf-mode can't handle non escaped single quotes
Date: Sun, 28 Jul 2019 11:50:56 +0200

Noam Postavsky <npostavs <at> gmail.com> writes:

> Lars Ingebrigtsen <larsi <at> gnus.org> writes:
>
>>> firstProperty=Hi I'm Diego
>>> secondProperty=I have a stringquote style.
>
>> No font-lock-string-face in sight, and there's no mention of it in the
>> file.  So is this some general font-lock thing that's configured
>> somewhere else?  Anybody know how this stuff works?
>
> font-lock-string-face comes from font-lock-syntactic-face-function,
> because ' has string delimiter syntax in conf-mode (see
> conf-mode-syntax-table).

Hm...  Oh!

    (modify-syntax-entry ?\' "\"" table)

I was searching for ?' and only found the entry in
conf-toml-mode-syntax-table.  I'll remove that superfluous backslash.

> I think it should be possible to make a syntax-propertize rule that
> catches unmatched quotes and sets them to punctuation syntax.  We do
> something similar in sgml-syntax-propertize.

I see.

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

Message #19 received at 24739 <at> debbugs.gnu.org (full text, mbox):

From: "Michalis V." <mvar.40k <at> gmail.com>
To: Diego Berrocal <cestdiego <at> gmail.com>
Cc: Lars Ingebrigtsen <larsi <at> gnus.org>, Noam Postavsky <npostavs <at> gmail.com>,
 24739 <at> debbugs.gnu.org
Subject: Re: bug#24739: 25.1; conf-mode can't handle non escaped single quotes
Date: Sat, 21 Aug 2021 18:39:04 +0300

Lars Ingebrigtsen <larsi <at> gnus.org> writes:

> Noam Postavsky <npostavs <at> gmail.com> writes:
>
>> Lars Ingebrigtsen <larsi <at> gnus.org> writes:
>>
>>>> firstProperty=Hi I'm Diego
>>>> secondProperty=I have a stringquote style.
>>
>>> No font-lock-string-face in sight, and there's no mention of it in the
>>> file.  So is this some general font-lock thing that's configured
>>> somewhere else?  Anybody know how this stuff works?
>>
>> font-lock-string-face comes from font-lock-syntactic-face-function,
>> because ' has string delimiter syntax in conf-mode (see
>> conf-mode-syntax-table).
>
> Hm...  Oh!
>
>     (modify-syntax-entry ?\' "\"" table)
>
> I was searching for ?' and only found the entry in
> conf-toml-mode-syntax-table.  I'll remove that superfluous backslash.
>
>> I think it should be possible to make a syntax-propertize rule that
>> catches unmatched quotes and sets them to punctuation syntax.  We do
>> something similar in sgml-syntax-propertize.
>
> I see.

hi,

this conf-mode doesn't seem to follow the syntax-propertize structure so
it doesn't look very trivial to do something similar as in sgml mode
(at least as far as i managed to grasp the concept in there)..But the
conf-mode author(s) seem like they were aware of this font-locking
problem and had this workaround instead:

(defun conf-quote-normal (arg)
  "Set the syntax of \\=' and \" to punctuation.
With prefix ARG, only do it for \\=' if 1, or only for \" if 2.
This only affects the current buffer.  Some conf files use quotes
to delimit strings, while others allow quotes as simple parts of
the assigned value.  In those files font locking will be wrong,
and you can correct it with this command.  (Some files even do
both, i.e. quotes delimit strings, except when they are
unbalanced, but hey...)"
  (interactive "P")
  (let ((table (copy-syntax-table (syntax-table))))
    (when (or (not arg) (= (prefix-numeric-value arg) 1))
      (modify-syntax-entry ?\' "." table))
    (when (or (not arg) (= (prefix-numeric-value arg) 2))
      (modify-syntax-entry ?\" "." table))
    (set-syntax-table table)
    (font-lock-flush)))


which is bound to C-c C-q and it will temporarily fix the incorrect string
font-locking.. Any chance if it is sufficient for you Diego or do you think
a more permanent solution should be implemented instead?

thank you in advance,
Michalis

Message #22 received at 24739 <at> debbugs.gnu.org (full text, mbox):

From: Lars Ingebrigtsen <larsi <at> gnus.org>
To: "Michalis V." <mvar.40k <at> gmail.com>
Cc: Noam Postavsky <npostavs <at> gmail.com>, 24739 <at> debbugs.gnu.org,
 Diego Berrocal <cestdiego <at> gmail.com>
Subject: Re: bug#24739: 25.1; conf-mode can't handle non escaped single quotes
Date: Sun, 22 Aug 2021 23:40:16 +0200

"Michalis V." <mvar.40k <at> gmail.com> writes:

> which is bound to C-c C-q and it will temporarily fix the incorrect string
> font-locking.. Any chance if it is sufficient for you Diego or do you think
> a more permanent solution should be implemented instead?

Yeah, I guess there's just to many variations in the syntax here for the
mode to do something better than it does.

It was suggested to treat quotes like string quotes when they're paired,
but that would mean

foo=I'm here and I'm there

would have "m here and I" quoted as a string, which isn't much of an
improvement.

So I think the user should just use the `C-c C-q' command (as you point
out) if conf-mode is doing it wrong in that particular conf file, and
I'm closing this bug report.

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

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