GNU bug report logs - #35567
27.0.50; Emacs-Lisp and ElDoc confusion with some strings

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From: Mauro Aranda <maurooaranda <at> gmail.com>
To: 35567 <at> debbugs.gnu.org
Subject: bug#35567: 27.0.50; Emacs-Lisp and ElDoc confusion with some strings
Date: Sat, 4 May 2019 18:14:54 -0300

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Hello.

I've found some cases where ElDoc displays function information in
the echo area, when it shouldn't.

Try the following, with the attached test.el (no need to eval it):
1) emacs -Q
2) C-x C-f test.el
3) There are two 'and' in the doc string of foo.  Do a search for 'and'
and stop after the first:
C-s and C-f: ElDoc doesn't show a function in the echo area, that's
fine.
Now search for the next 'and':
C-s C-s C-f: ElDoc shows `and: (CONDITIONS...)' in the echo area.  That
shouldn't happen.
4) Also, there's a " in a comment, in the last line.  Search for "here",
just like for "and" before:
C-s here C-f: ElDoc again shows `and: (CONDITIONS...)'.  That again,
shouldn't happen.

In these cases, I see that elisp--fnsym-in-current-sexp doesn't return nil,
as it should when point is inside a string.  So far, I've only found that
a quoted ( confuses it, when the ) is not quoted.  But for the bug to
become visible, the word that follows ")" has to be an interned symbol.

Another example is in the file lisp/files.el.  Put point in the doc string
of
the variable file-name-version-regexp, and see that ElDoc shows
`while: (TEST BODY...)' in the echo area.  I think that happens because
there are " in some comments lines before the doc string.

It seems that the problem is that elisp--beginning-of-sexp calls
forward-sexp, even though its doc string explicitly says that it assumes
point is not in a string or a comment.  Most of the time it still works,
but it fails in some cases, and in those cases, the check for the current
word not being inside a string loses its purpose.

Perhaps using the return value of syntax-ppss before calling
elisp--beginning-of-sexp would be enough to avoid this confusion.

Also, let me ask: was there any discussion about the usefulness of having
ElDoc display information when point is inside a comment?  I ask because
I only see the intention to check when not inside a string.

Best regards,
Mauro.

In GNU Emacs 27.0.50 (build 1, i686-pc-linux-gnu, GTK+ Version 3.18.9)
 of 2019-05-04 built on the-blackbeard
Repository revision: a90ad2297391cf5fe284a4c6e81724360ed018a4
Repository branch: master
Windowing system distributor 'The X.Org Foundation', version 11.0.11906000
System Description: Ubuntu 16.04.6 LTS

Recent messages:
For information about GNU Emacs and the GNU system, type C-h C-a.

Configured features:
XPM JPEG TIFF GIF PNG RSVG IMAGEMAGICK SOUND GPM DBUS GSETTINGS GLIB
NOTIFY INOTIFY ACL LIBSELINUX GNUTLS LIBXML2 FREETYPE M17N_FLT LIBOTF
XFT ZLIB TOOLKIT_SCROLL_BARS GTK3 X11 XDBE XIM THREADS PDUMPER LCMS2 GMP

Important settings:
  value of $LANG: en_US.utf8
  value of $XMODIFIERS:
  locale-coding-system: utf-8-unix

Major mode: Lisp Interaction

Minor modes in effect:
  tooltip-mode: t
  global-eldoc-mode: t
  eldoc-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  tool-bar-mode: t
  menu-bar-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

Load-path shadows:
None found.

Features:
(shadow sort mail-extr emacsbug message rmc puny seq byte-opt gv
bytecomp byte-compile cconv dired dired-loaddefs format-spec rfc822 mml
easymenu mml-sec password-cache epa derived epg epg-config gnus-util
rmail rmail-loaddefs text-property-search time-date mm-decode mm-bodies
mm-encode mail-parse rfc2231 mailabbrev gmm-utils mailheader cl-loaddefs
cl-lib sendmail rfc2047 rfc2045 ietf-drums mm-util mail-prsvr mail-utils
elec-pair mule-util tooltip eldoc electric uniquify ediff-hook vc-hooks
lisp-float-type mwheel term/x-win x-win term/common-win x-dnd tool-bar
dnd fontset image regexp-opt fringe tabulated-list replace newcomment
text-mode elisp-mode lisp-mode prog-mode register page menu-bar
rfn-eshadow isearch timer select scroll-bar mouse jit-lock font-lock
syntax facemenu font-core term/tty-colors frame cl-generic 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 charscript charprop
case-table epa-hook jka-cmpr-hook help simple abbrev obarray minibuffer
cl-preloaded nadvice loaddefs button faces cus-face macroexp files
text-properties overlay sha1 md5 base64 format env code-pages mule
custom widget hashtable-print-readable backquote threads dbusbind
inotify lcms2 dynamic-setting system-font-setting font-render-setting
move-toolbar gtk x-toolkit x multi-tty make-network-process emacs)

Memory information:
((conses 8 44043 5027)
 (symbols 24 5870 1)
 (strings 16 14982 1524)
 (string-bytes 1 501645)
 (vectors 8 8861)
 (vector-slots 4 114202 9774)
 (floats 8 17 14)
 (intervals 28 191 4)
 (buffers 564 11)
 (heap 1024 7516 761))

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[test.el (text/x-emacs-lisp, attachment)]

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