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Subject: bug#23298: 25.0.92; electric-pair-delete-pair doesn't check if parens are balanced
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When pressing Backspace key, with electric-pair-mode enabled,
it unconditionally deletes the following char, if its the matching pair.
Ideally, it may better check if it breaks the equilibrium of
braces/quotes.

Eg: code: (char-before (point))
                             |_ point location
If my point (cursor) is just before the last paren (the cursor is
blinking on the last paren), and I press backspace until the beginning
of "point"[0], and then one char back[1], it just deletes the bracket,
without checking if the parens are balanced.

code:
        [0] (char-before ()
                         |_point location
        [1] (char-before
                        |_ point location

This could be the case of quotes, braces, etc.

In GNU Emacs 25.0.92.1 (x86_64-unknown-linux-gnu, GTK+ Version 3.18.9)
 of 2016-04-13 built on fedora.localdomain
Windowing system distributor 'Fedora Project', version 11.0.11800000
Configured features:
XPM JPEG TIFF GIF PNG SOUND DBUS GSETTINGS NOTIFY ACL LIBSELINUX GNUTLS
LIBXML2 FREETYPE XFT ZLIB TOOLKIT_SCROLL_BARS GTK3 X11

Important settings:
  value of $LC_MONETARY: en_IN.UTF-8
  value of $LC_NUMERIC: en_IN.UTF-8
  value of $LC_TIME: en_IN.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:
  electric-pair-mode: t
  tooltip-mode: t
  global-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

Recent messages:
For information about GNU Emacs and the GNU system, type C-h C-a.
Quit
Electric-Pair mode enabled
41 (#o51, #x29, ?\))
Making completion list...

Load-path shadows:
None found.

Features:
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hashtable-print-readable backquote dbusbind inotify dynamic-setting
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multi-tty make-network-process emacs)

Memory information:
((conses 16 93411 4512)
 (symbols 48 20513 0)
 (miscs 40 79 146)
 (strings 32 15817 4612)
 (string-bytes 1 434978)
 (vectors 16 11738)
 (vector-slots 8 421568 5007)
 (floats 8 166 249)
 (intervals 56 218 10)
 (buffers 976 12)
 (heap 1024 46579 1042))

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From: help-debbugs@HIDDEN (GNU bug Tracking System)
To: Mohammed Sadik <sadiq@HIDDEN>
Subject: bug#23298: Acknowledgement (25.0.92; electric-pair-delete-pair
 doesn't check if parens are balanced)
Message-ID: <handler.23298.B.14607707478640.ack <at> debbugs.gnu.org>
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Reply-To: 23298 <at> debbugs.gnu.org
Date: Sat, 16 Apr 2016 01:40:02 +0000

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Subject: bug#23298: 25.0.92; electric-pair-delete-pair doesn't check if parens are balanced
Resent-From: Lars Ingebrigtsen <larsi@HIDDEN>
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To: Mohammed Sadik <sadiq@HIDDEN>
Cc: 23298 <at> debbugs.gnu.org
From: Lars Ingebrigtsen <larsi@HIDDEN>
References: <CANHUxH02=sMnHjC1G-TDRwXyHRvbcvubdViAY336aXkA4q4DjQ@HIDDEN>
Date: Sun, 28 Jul 2019 22:07:49 +0200
In-Reply-To: <CANHUxH02=sMnHjC1G-TDRwXyHRvbcvubdViAY336aXkA4q4DjQ@HIDDEN>
 (Mohammed Sadik's message of "Sat, 16 Apr 2016 07:08:50 +0530")
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Mohammed Sadik <sadiq@HIDDEN> writes:

> When pressing Backspace key, with electric-pair-mode enabled,
> it unconditionally deletes the following char, if its the matching pair.
> Ideally, it may better check if it breaks the equilibrium of
> braces/quotes.
>
> Eg: code: (char-before (point))
>                              |_ point location
> If my point (cursor) is just before the last paren (the cursor is
> blinking on the last paren), and I press backspace until the beginning
> of "point"[0], and then one char back[1], it just deletes the bracket,
> without checking if the parens are balanced.
>
> code:
>         [0] (char-before ()
>                          |_point location
>         [1] (char-before
>                         |_ point location
>
> This could be the case of quotes, braces, etc.

(I'm going through old Emacs bug reports that haven't received any
response.)

Or a simpler example:

(foo ()

If you put point after the next-to-last character, then hitting DEL will
delete the last pair:

(foo 

But...  I don't think this is a bug?  electric-pair-mode doesn't promise
to keep things balanced globally, but delete the matching pair if you
delete an opening parenthesis?  I think.

Does that tally with what everybody else would expect?

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

Message sent to bug-gnu-emacs@HIDDEN:

Subject: bug#23298: 25.0.92; electric-pair-delete-pair doesn't check if parens are balanced
Resent-From: Stefan Kangas <stefan@HIDDEN>
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To: Lars Ingebrigtsen <larsi@HIDDEN>
Cc: Mohammed Sadik <sadiq@HIDDEN>, 23298 <at> debbugs.gnu.org
From: Stefan Kangas <stefan@HIDDEN>
In-Reply-To: <87ftmpapnu.fsf@HIDDEN> (Lars Ingebrigtsen's message of
 "Sun, 28 Jul 2019 22:07:49 +0200")
References: <CANHUxH02=sMnHjC1G-TDRwXyHRvbcvubdViAY336aXkA4q4DjQ@HIDDEN>
 <87ftmpapnu.fsf@HIDDEN>
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Date: Tue, 11 Aug 2020 19:52:12 -0700
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Lars Ingebrigtsen <larsi@HIDDEN> writes:

> Mohammed Sadik <sadiq@HIDDEN> writes:
>
>> When pressing Backspace key, with electric-pair-mode enabled,
>> it unconditionally deletes the following char, if its the matching pair.
>> Ideally, it may better check if it breaks the equilibrium of
>> braces/quotes.
>>
>> Eg: code: (char-before (point))
>>                              |_ point location
>> If my point (cursor) is just before the last paren (the cursor is
>> blinking on the last paren), and I press backspace until the beginning
>> of "point"[0], and then one char back[1], it just deletes the bracket,
>> without checking if the parens are balanced.
>>
>> code:
>>         [0] (char-before ()
>>                          |_point location
>>         [1] (char-before
>>                         |_ point location
>>
>> This could be the case of quotes, braces, etc.
>
> (I'm going through old Emacs bug reports that haven't received any
> response.)
>
> Or a simpler example:
>
> (foo ()
>
> If you put point after the next-to-last character, then hitting DEL will
> delete the last pair:
>
> (foo
>
> But...  I don't think this is a bug?  electric-pair-mode doesn't promise
> to keep things balanced globally, but delete the matching pair if you
> delete an opening parenthesis?  I think.
>
> Does that tally with what everybody else would expect?

Do we have any electric-pair-mode users who could comment on this?

Best regards,
Stefan Kangas

Last modified: Wed, 12 Aug 2020 03:00:02 UTC

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