GNU bug report logs - #11531
24.1.50; electric-pair-mode needs to detect apostrophes in strings or comments

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Simon Law <sfllaw <at> sfllaw.ca>
Subject: bug#11531: closed (Fwd: 24.1.50; electric-pair-mode needs to
 detect apostrophes in strings or comments)
Date: Thu, 09 Jun 2016 23:21:02 +0000

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Your bug report

#11531: 24.1.50; electric-pair-mode needs to detect apostrophes in strings or comments

which was filed against the emacs package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to 11531 <at> debbugs.gnu.org.

-- 
11531: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=11531
GNU Bug Tracking System
Contact help-debbugs <at> gnu.org with problems

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From: Noam Postavsky <npostavs <at> users.sourceforge.net>
To: 11531-done <at> debbugs.gnu.org
Subject: Fwd: 24.1.50; electric-pair-mode needs to detect apostrophes in
 strings or comments
Date: Thu, 9 Jun 2016 19:20:20 -0400

Seems to have been fixed in 24.5 at the latest

[Message part 3 (message/rfc822, inline)]

From: Simon Law <sfllaw <at> sfllaw.ca>
To: bug-gnu-emacs <at> gnu.org
Subject: 24.1.50;
	electric-pair-mode needs to detect apostrophes in strings or comments
Date: Mon, 21 May 2012 00:33:47 -0400

Reproduction steps:

$ emacs -Q
M-x js-mode
M-x electric-pair-mode
Type: // Simon's comment
Press RET
Type "Simon's string"
Press RET

Expected result:

// Simon's comment
"Simon's string"

Actual result:

// Simon's comment'
"Simon's string'"

Notes:

Inside a comment or string, in a programming mode, we can try to detect
apostophes. An apostrophe is likely if you've inserted a single-quote
that immediately follows a word character.

Here is my workaround:

(defadvice electric-pair-post-self-insert-function (around
                                                    electric-pair-apostrophe
                                                    activate)
  "Fix electric-pair to handle apostrophes inside strings or comments"
  (let* ((quick-syntax-info (syntax-ppss))
         (inside-string (fourth quick-syntax-info))
         (inside-comment (fifth quick-syntax-info)))
    (if (not (eq last-command-event ?\'))
        ;; Only deal with single-quote characters
        ad-do-it
      (let* ((char-before-insert (char-before (1- (point))))
             (char-before-syntax (and char-before-insert
                                     (char-syntax char-before-insert))))
        ;; We want the character before the self-insert-command
        (if (and (or inside-string inside-comment)
                 (eq char-before-syntax ?w))
            ;; Single-quotes inside a string or comment, and immediately
            ;; following a word, are actually apostrophes and should not
            ;; be paired.
            t
          ad-do-it)))))

In GNU Emacs 24.1.50.1 (x86_64-pc-linux-gnu, GTK+ Version 3.2.0)
 of 2012-05-10 on charichuelo, modified by Debian
 (emacs-snapshot package, version 2:20120510-1~ppa1~oneiric1)
Windowing system distributor `The X.Org Foundation', version 11.0.11004000
Configured using:
 `configure '--build' 'x86_64-linux-gnu' '--host' 'x86_64-linux-gnu'
 '--prefix=/usr' '--sharedstatedir=/var/lib' '--libexecdir=/usr/lib'
 '--localstatedir=/var' '--infodir=/usr/share/info'
 '--mandir=/usr/share/man' '--with-pop=yes'
 '--enable-locallisppath=/etc/emacs-snapshot:/etc/emacs:/usr/local/share/emacs/24.1.50/site-lisp:/usr/local/share/emacs/site-lisp:/usr/share/emacs/24.1.50/site-lisp:/usr/share/emacs/site-lisp'
 '--without-compress-info' '--with-crt-dir=/usr/lib/x86_64-linux-gnu/'
 '--with-x=yes' '--with-x-toolkit=gtk3' '--with-imagemagick=yes'
 'build_alias=x86_64-linux-gnu' 'host_alias=x86_64-linux-gnu'
 'CFLAGS=-DDEBIAN -DSITELOAD_PURESIZE_EXTRA=5000 -g -O2' 'LDFLAGS=-g
 -Wl,--as-needed -znocombreloc' 'CPPFLAGS=''

Important settings:
  value of $LC_ALL: nil
  value of $LC_COLLATE: en_CA.UTF-8
  value of $LC_CTYPE: en_CA.UTF-8
  value of $LC_MESSAGES: en_CA.UTF-8
  value of $LC_MONETARY: nil
  value of $LC_NUMERIC: nil
  value of $LC_TIME: nil
  value of $LANG: en_CA.UTF-8
  value of $XMODIFIERS: nil
  locale-coding-system: utf-8-unix
  default enable-multibyte-characters: t

Major mode: Javascript

Minor modes in effect:
  electric-pair-mode: t
  tooltip-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

Recent input:
M-x j s - m o d e <return> M-x e l e c t r i c - p 
a i r - m o d e <return> / / SPC S i m o n ' s SPC 
c o m m e n t C-e <return> " S i m o n ' s SPC s t 
r i n g C-n M-x r e p o r t - e m a c s - b u g
<return>

Recent messages:
For information about GNU Emacs and the GNU system, type C-h C-a.
Electric-Pair mode enabled
byte-code: End of buffer

Load-path shadows:
/usr/share/emacs/24.1.50/site-lisp/debian-startup hides /usr/share/emacs/site-lisp/debian-startup

Features:
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mail-prsvr mail-utils cus-start cus-load electric js byte-opt bytecomp
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