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Subject: bug#36006: electric-pair-mode fails to balance in certain cases
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From: Dario Gjorgjevski <dario.gjorgjevski@HIDDEN>
Date: Thu, 30 May 2019 17:11:31 +0200
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Consider the following text in html-mode with electric-pair-mode turned
on and electric-pair-skip-self set to electric-pair-default-skip-self:
<|>
(Take | to denote point.) In this situation, the expected result of
attempting to insert > is to skip over the one immediately after point,
i.e., end up with <>|. However, what we get instead is <>|>. Only if
we *now* attempt to insert >, we end up with <>>|, which doesn't make
any sense.
The same behavior is observed with ordinary parentheses in html-mode,
too.
From my debugging, the culprit seems to be an unnecessary (or mistaken?)
use of electric-pair--with-uncached-syntax. I am not sure *why* exactly
it happens, and would appreciate further insight.
The patch shown below fixes the issue.
diff --git a/lisp/elec-pair.el b/lisp/elec-pair.el
index 5fb9d751e2..6450d02c9e 100644
--- a/lisp/elec-pair.el
+++ b/lisp/elec-pair.el
@@ -325,11 +325,9 @@ electric-pair--balance-info
(cond ((< direction 0)
(condition-case nil
(eq (char-after pos)
- (electric-pair--with-uncached-syntax
- (table)
- (matching-paren
- (char-before
- (scan-sexps (point) 1)))))
+ (matching-paren
+ (char-before
+ (scan-sexps (point) 1))))
(scan-error nil)))
(t
;; In this case, no need to use
--
Dario Gjorgjevski :: <dario.gjorgjevski@HIDDEN>
:: 744A 4F0B 4F1C 9371
:: +48 1525 8666837
Content-Disposition: inline Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-Mailer: MIME-tools 5.505 (Entity 5.505) Content-Type: text/plain; charset=utf-8 X-Loop: help-debbugs@HIDDEN From: help-debbugs@HIDDEN (GNU bug Tracking System) To: Dario Gjorgjevski <dario.gjorgjevski@HIDDEN> Subject: bug#36006: Acknowledgement (electric-pair-mode fails to balance in certain cases) Message-ID: <handler.36006.B.155922910623510.ack <at> debbugs.gnu.org> References: <87woi80yfw.fsf@HIDDEN> X-Gnu-PR-Message: ack 36006 X-Gnu-PR-Package: emacs Reply-To: 36006 <at> debbugs.gnu.org Date: Thu, 30 May 2019 15:12:04 +0000 Thank you for filing a new bug report with debbugs.gnu.org. This is an automatically generated reply to let you know your message has been received. Your message is being forwarded to the package maintainers and other interested parties for their attention; they will reply in due course. Your message has been sent to the package maintainer(s): bug-gnu-emacs@HIDDEN If you wish to submit further information on this problem, please send it to 36006 <at> debbugs.gnu.org. Please do not send mail to help-debbugs@HIDDEN unless you wish to report a problem with the Bug-tracking system. --=20 36006: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=3D36006 GNU Bug Tracking System Contact help-debbugs@HIDDEN with problems
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Subject: bug#36006: electric-pair-mode fails to balance in certain cases
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Date: Thu, 30 May 2019 13:36:39 -0400
In-Reply-To: <87woi80yfw.fsf@HIDDEN> (Dario Gjorgjevski's message of "Thu,
30 May 2019 17:11:31 +0200")
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Dario Gjorgjevski <dario.gjorgjevski@HIDDEN> writes:
> Consider the following text in html-mode with electric-pair-mode turned
> on and electric-pair-skip-self set to electric-pair-default-skip-self:
>
> <|>
>
> (Take | to denote point.) In this situation, the expected result of
> attempting to insert > is to skip over the one immediately after point,
> i.e., end up with <>|. However, what we get instead is <>|>. Only if
> we *now* attempt to insert >, we end up with <>>|, which doesn't make
> any sense.
I'm having trouble reproducing this; what's the exact sequence of input
starting from 'emacs -Q'? And what version of Emacs is this?
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Subject: bug#36006: electric-pair-mode fails to balance in certain cases
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> I'm having trouble reproducing this; what's the exact sequence of input
> starting from 'emacs -Q'?
Run 'emacs -Q'; it opens up with the *scratch* buffer. Now:
1. M-x electric-pair-mode <RET>
2. M-x html-mode <RET>
3. <div>
(The order of 1. and 2. is irrelevant.) What I expect to see in the
buffer is:
<div>|
What I see instead is:
<div>|>
If I type another '>', I end up with:
<div>>|
> And what version of Emacs is this?
In GNU Emacs 27.0.50 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.24.8)
of 2019-05-30 built on dario-XPS-13-9370
Repository revision: cc71a82fc705a73fa3ef6cda3ec6bee1cb654d7e
Repository branch: master
Windowing system distributor 'The X.Org Foundation', version 11.0.12004000
System Description: Ubuntu 19.04
--
Dario Gjorgjevski :: <dario.gjorgjevski@HIDDEN>
:: 744A 4F0B 4F1C 9371
:: +48 1525 8666837
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Subject: bug#36006: electric-pair-mode fails to balance in certain cases
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From: Noam Postavsky <npostavs@HIDDEN>
References: <87woi80yfw.fsf@HIDDEN> <85blzjdeu0.fsf@HIDDEN>
<8736kvd30p.fsf@HIDDEN>
Date: Thu, 06 Jun 2019 19:39:57 -0400
In-Reply-To: <8736kvd30p.fsf@HIDDEN> (Dario Gjorgjevski's message of "Thu,
30 May 2019 23:51:50 +0200")
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found 36006 27.0.50
tags 36006 + confirmed
quit
Dario Gjorgjevski <dario.gjorgjevski@HIDDEN> writes:
>> I'm having trouble reproducing this; what's the exact sequence of input
>> starting from 'emacs -Q'?
>
> Run 'emacs -Q'; it opens up with the *scratch* buffer. Now:
>
> 1. M-x electric-pair-mode <RET>
> 2. M-x html-mode <RET>
> 3. <div>
Ah, got it now, I think I was inserting before starting html-mode before.
> From my debugging, the culprit seems to be an unnecessary (or mistaken?)
> use of electric-pair--with-uncached-syntax. I am not sure *why* exactly
> it happens, and would appreciate further insight.
It doesn't happen in emacs-26, which has the same
electric-pair--with-uncached-syntax call, so it's not just that alone.
I suspect this could be related to the recent changes to mark ">"
outside of tags with punctuation syntax (technically, <foo>a > b</foo>
is valid, only "<" needs to be escaped as <).
This is kind of a pain to debug, when I stepped with edebug, it worked,
I think because stepping gives time for syntax-propertize to run.
Received: (at control) by debbugs.gnu.org; 6 Jun 2019 23:40:06 +0000 From debbugs-submit-bounces <at> debbugs.gnu.org Thu Jun 06 19:40:05 2019 Received: from localhost ([127.0.0.1]:50806 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <debbugs-submit-bounces <at> debbugs.gnu.org>) id 1hZ1zJ-0004lV-Lo for submit <at> debbugs.gnu.org; Thu, 06 Jun 2019 19:40:05 -0400 Received: from mail-io1-f41.google.com ([209.85.166.41]:35981) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <npostavs@HIDDEN>) id 1hZ1zI-0004kt-Gz; Thu, 06 Jun 2019 19:40:05 -0400 Received: by mail-io1-f41.google.com with SMTP id h6so29375ioh.3; Thu, 06 Jun 2019 16:40:04 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:references:date:in-reply-to:message-id :user-agent:mime-version; bh=F6WKbFnq6ztmnwNmHYbI+gT82gW4kQpTodrm0blts2E=; b=V2mZ5IBwmZ5kd40p0/qmiUhWfHevHNofxymsa/HjDM5J5EQtvG8V2RMXsV82bViN0t jUl3nRblBVMA50KInjY8YbZMRbuGU27aT3MQhGUaSgTGHD8P75511IarpgkZhZeUOQQ2 Tme4Np7/dR76FZ9iBDNoXXVNzMklIWy+aOVjOQouweKRKPWSSc6HRWn+6eSYBVGwJgf0 OdzVUKRqHKKt5IvAbLCaT41GQaovf9Du2lmw7zbrkpTeGiz+XcCCRRmwGq+QWCCL5MhF YRU3FiKzwXfk5S5hv0AkPxKIHlxuWcloQssGUPV/cxQ1TZjpfIZ8dKuI4p5slcWcXmae ixbw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:references:date:in-reply-to :message-id:user-agent:mime-version; bh=F6WKbFnq6ztmnwNmHYbI+gT82gW4kQpTodrm0blts2E=; b=mxUMlOJh1G0V0DBAS77UwWSebYAwCBRQm2nRAG+LY9u9uEtj8lcMysnaaJaYx/lhhg u5C7oiLg6zBsIh1rcKAwW+huLkxilCqwuncTaOXpFTJd57n09TCx0kWgQIF30PNSfpnM ljakNsnPToV0okT6+GXyRu1KWlo6Y3rHKXDUcqd7eZOiArWBcZIHsaxtee2B+VOh8DqG N/3EzNZEzmrziPhcjQ7gOcEIv5yI2ZTysEe1VchOJU5P4Nq2L7qI6jSJ960wT1u3g7i8 ybn7w+VVkm9F3gJfgdGxSKpG/Eg+/Sz2xkqy8soTrfxg7gFHjwOq+rG2qpMPL1btBySX x0FA== X-Gm-Message-State: APjAAAVYfvknYxomAuSpKtXJtZN+5nnhg7zelxDxkAySrOUcywGkg/hG G0y2kLKoB+sw0P92TJf9aiUBdDp4 X-Google-Smtp-Source: APXvYqxOSk9F0cT9DcDiXKsbiDAunPtxyBV0XVzyHtrBZx6L2BIxd7MdDQ7Al1i2GZAWJAgta6qfbg== X-Received: by 2002:a6b:6b14:: with SMTP id g20mr29806956ioc.28.1559864398705; Thu, 06 Jun 2019 16:39:58 -0700 (PDT) Received: from minid (cbl-45-2-119-34.yyz.frontiernetworks.ca. [45.2.119.34]) by smtp.gmail.com with ESMTPSA id a1sm132864ioo.5.2019.06.06.16.39.58 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Thu, 06 Jun 2019 16:39:58 -0700 (PDT) From: Noam Postavsky <npostavs@HIDDEN> To: Dario Gjorgjevski <dario.gjorgjevski@HIDDEN> Subject: Re: bug#36006: electric-pair-mode fails to balance in certain cases References: <87woi80yfw.fsf@HIDDEN> <85blzjdeu0.fsf@HIDDEN> <8736kvd30p.fsf@HIDDEN> Date: Thu, 06 Jun 2019 19:39:57 -0400 In-Reply-To: <8736kvd30p.fsf@HIDDEN> (Dario Gjorgjevski's message of "Thu, 30 May 2019 23:51:50 +0200") Message-ID: <87d0jq2she.fsf@HIDDEN> User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/26.2 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain X-Spam-Score: 0.0 (/) X-Debbugs-Envelope-To: control Cc: 36006 <at> debbugs.gnu.org X-BeenThere: debbugs-submit <at> debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: <debbugs-submit.debbugs.gnu.org> List-Unsubscribe: <https://debbugs.gnu.org/cgi-bin/mailman/options/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=unsubscribe> List-Archive: <https://debbugs.gnu.org/cgi-bin/mailman/private/debbugs-submit/> List-Post: <mailto:debbugs-submit <at> debbugs.gnu.org> List-Help: <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=help> List-Subscribe: <https://debbugs.gnu.org/cgi-bin/mailman/listinfo/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=subscribe> Errors-To: debbugs-submit-bounces <at> debbugs.gnu.org Sender: "Debbugs-submit" <debbugs-submit-bounces <at> debbugs.gnu.org> X-Spam-Score: -1.0 (-) found 36006 27.0.50 tags 36006 + confirmed quit Dario Gjorgjevski <dario.gjorgjevski@HIDDEN> writes: >> I'm having trouble reproducing this; what's the exact sequence of input >> starting from 'emacs -Q'? > > Run 'emacs -Q'; it opens up with the *scratch* buffer. Now: > > 1. M-x electric-pair-mode <RET> > 2. M-x html-mode <RET> > 3. <div> Ah, got it now, I think I was inserting before starting html-mode before. > From my debugging, the culprit seems to be an unnecessary (or mistaken?) > use of electric-pair--with-uncached-syntax. I am not sure *why* exactly > it happens, and would appreciate further insight. It doesn't happen in emacs-26, which has the same electric-pair--with-uncached-syntax call, so it's not just that alone. I suspect this could be related to the recent changes to mark ">" outside of tags with punctuation syntax (technically, <foo>a > b</foo> is valid, only "<" needs to be escaped as <). This is kind of a pain to debug, when I stepped with edebug, it worked, I think because stepping gives time for syntax-propertize to run.
Received: (at control) by debbugs.gnu.org; 6 Jun 2019 23:40:06 +0000 From debbugs-submit-bounces <at> debbugs.gnu.org Thu Jun 06 19:40:05 2019 Received: from localhost ([127.0.0.1]:50806 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <debbugs-submit-bounces <at> debbugs.gnu.org>) id 1hZ1zJ-0004lV-Lo for submit <at> debbugs.gnu.org; Thu, 06 Jun 2019 19:40:05 -0400 Received: from mail-io1-f41.google.com ([209.85.166.41]:35981) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <npostavs@HIDDEN>) id 1hZ1zI-0004kt-Gz; Thu, 06 Jun 2019 19:40:05 -0400 Received: by mail-io1-f41.google.com with SMTP id h6so29375ioh.3; Thu, 06 Jun 2019 16:40:04 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:references:date:in-reply-to:message-id :user-agent:mime-version; bh=F6WKbFnq6ztmnwNmHYbI+gT82gW4kQpTodrm0blts2E=; b=V2mZ5IBwmZ5kd40p0/qmiUhWfHevHNofxymsa/HjDM5J5EQtvG8V2RMXsV82bViN0t jUl3nRblBVMA50KInjY8YbZMRbuGU27aT3MQhGUaSgTGHD8P75511IarpgkZhZeUOQQ2 Tme4Np7/dR76FZ9iBDNoXXVNzMklIWy+aOVjOQouweKRKPWSSc6HRWn+6eSYBVGwJgf0 OdzVUKRqHKKt5IvAbLCaT41GQaovf9Du2lmw7zbrkpTeGiz+XcCCRRmwGq+QWCCL5MhF YRU3FiKzwXfk5S5hv0AkPxKIHlxuWcloQssGUPV/cxQ1TZjpfIZ8dKuI4p5slcWcXmae ixbw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:references:date:in-reply-to :message-id:user-agent:mime-version; bh=F6WKbFnq6ztmnwNmHYbI+gT82gW4kQpTodrm0blts2E=; b=mxUMlOJh1G0V0DBAS77UwWSebYAwCBRQm2nRAG+LY9u9uEtj8lcMysnaaJaYx/lhhg u5C7oiLg6zBsIh1rcKAwW+huLkxilCqwuncTaOXpFTJd57n09TCx0kWgQIF30PNSfpnM ljakNsnPToV0okT6+GXyRu1KWlo6Y3rHKXDUcqd7eZOiArWBcZIHsaxtee2B+VOh8DqG N/3EzNZEzmrziPhcjQ7gOcEIv5yI2ZTysEe1VchOJU5P4Nq2L7qI6jSJ960wT1u3g7i8 ybn7w+VVkm9F3gJfgdGxSKpG/Eg+/Sz2xkqy8soTrfxg7gFHjwOq+rG2qpMPL1btBySX x0FA== X-Gm-Message-State: APjAAAVYfvknYxomAuSpKtXJtZN+5nnhg7zelxDxkAySrOUcywGkg/hG G0y2kLKoB+sw0P92TJf9aiUBdDp4 X-Google-Smtp-Source: APXvYqxOSk9F0cT9DcDiXKsbiDAunPtxyBV0XVzyHtrBZx6L2BIxd7MdDQ7Al1i2GZAWJAgta6qfbg== X-Received: by 2002:a6b:6b14:: with SMTP id g20mr29806956ioc.28.1559864398705; Thu, 06 Jun 2019 16:39:58 -0700 (PDT) Received: from minid (cbl-45-2-119-34.yyz.frontiernetworks.ca. [45.2.119.34]) by smtp.gmail.com with ESMTPSA id a1sm132864ioo.5.2019.06.06.16.39.58 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Thu, 06 Jun 2019 16:39:58 -0700 (PDT) From: Noam Postavsky <npostavs@HIDDEN> To: Dario Gjorgjevski <dario.gjorgjevski@HIDDEN> Subject: Re: bug#36006: electric-pair-mode fails to balance in certain cases References: <87woi80yfw.fsf@HIDDEN> <85blzjdeu0.fsf@HIDDEN> <8736kvd30p.fsf@HIDDEN> Date: Thu, 06 Jun 2019 19:39:57 -0400 In-Reply-To: <8736kvd30p.fsf@HIDDEN> (Dario Gjorgjevski's message of "Thu, 30 May 2019 23:51:50 +0200") Message-ID: <87d0jq2she.fsf@HIDDEN> User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/26.2 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain X-Spam-Score: 0.0 (/) X-Debbugs-Envelope-To: control Cc: 36006 <at> debbugs.gnu.org X-BeenThere: debbugs-submit <at> debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: <debbugs-submit.debbugs.gnu.org> List-Unsubscribe: <https://debbugs.gnu.org/cgi-bin/mailman/options/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=unsubscribe> List-Archive: <https://debbugs.gnu.org/cgi-bin/mailman/private/debbugs-submit/> List-Post: <mailto:debbugs-submit <at> debbugs.gnu.org> List-Help: <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=help> List-Subscribe: <https://debbugs.gnu.org/cgi-bin/mailman/listinfo/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=subscribe> Errors-To: debbugs-submit-bounces <at> debbugs.gnu.org Sender: "Debbugs-submit" <debbugs-submit-bounces <at> debbugs.gnu.org> X-Spam-Score: -1.0 (-) found 36006 27.0.50 tags 36006 + confirmed quit Dario Gjorgjevski <dario.gjorgjevski@HIDDEN> writes: >> I'm having trouble reproducing this; what's the exact sequence of input >> starting from 'emacs -Q'? > > Run 'emacs -Q'; it opens up with the *scratch* buffer. Now: > > 1. M-x electric-pair-mode <RET> > 2. M-x html-mode <RET> > 3. <div> Ah, got it now, I think I was inserting before starting html-mode before. > From my debugging, the culprit seems to be an unnecessary (or mistaken?) > use of electric-pair--with-uncached-syntax. I am not sure *why* exactly > it happens, and would appreciate further insight. It doesn't happen in emacs-26, which has the same electric-pair--with-uncached-syntax call, so it's not just that alone. I suspect this could be related to the recent changes to mark ">" outside of tags with punctuation syntax (technically, <foo>a > b</foo> is valid, only "<" needs to be escaped as <). This is kind of a pain to debug, when I stepped with edebug, it worked, I think because stepping gives time for syntax-propertize to run.
X-Loop: help-debbugs@HIDDEN
Subject: bug#36006: electric-pair-mode fails to balance in certain cases
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From: Dario Gjorgjevski <dario.gjorgjevski@HIDDEN>
Date: Fri, 22 Nov 2019 13:28:48 +0100
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--=-=-=
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: quoted-printable
(It=E2=80=99s been so long since I last looked into the bug...)
> It doesn't happen in emacs-26, which has the same
> electric-pair--with-uncached-syntax call, so it's not just that alone.
> I suspect this could be related to the recent changes to mark ">"
> outside of tags with punctuation syntax (technically, <foo>a > b</foo>
> is valid, only "<" needs to be escaped as <).
You=E2=80=99re right. The problem is that electric-pair--with-uncached-syn=
tax
let-binds syntax-propertize-function to ignore, causing the syntax of
">" to not be updated.
Applying the attached patch fixes the issue. However, in what cases
would we want syntax-propertize-function to be let-bound to ignore?
Best regards,
Dario
--=-=-=
Content-Type: text/x-diff
Content-Disposition: inline;
filename=0001-Leave-syntax-propertize-function-unchanged.patch
Content-Description: Do not let-bind syntax-propertize-function to ignore in
electric-pair--with-uncached-syntax
From 6de30e0cdc97475b3aac2a35bec1fcf1ac0af84f Mon Sep 17 00:00:00 2001
From: Dario Gjorgjevski <dario.gjorgjevski+git@HIDDEN>
Date: Fri, 22 Nov 2019 13:19:39 +0100
Subject: [PATCH] Leave syntax-propertize-function unchanged
* lisp/elec-pair.el (electric-pair--with-uncached-syntax): Do not
let-bind syntax-propertize-function.
---
lisp/elec-pair.el | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)
diff --git a/lisp/elec-pair.el b/lisp/elec-pair.el
index f3cbee7048..6e528b2dfd 100644
--- a/lisp/elec-pair.el
+++ b/lisp/elec-pair.el
@@ -246,8 +246,7 @@ electric-pair--with-uncached-syntax
cache is flushed from position START, defaulting to point."
(declare (debug ((form &optional form) body)) (indent 1))
(let ((start-var (make-symbol "start")))
- `(let ((syntax-propertize-function #'ignore)
- (,start-var ,(or start '(point))))
+ `(let ((,start-var ,(or start '(point))))
(unwind-protect
(with-syntax-table ,table
,@body)
--
2.17.1
--=-=-=--
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X-Loop: help-debbugs@HIDDEN
Subject: bug#36006: electric-pair-mode fails to balance in certain cases
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I don't know if the following information is useful, but on the "<div>"
example given by the OP, the difference between Emacs 26 and 27 is that,
in `electric-pair--balance-info', in the expression
(eq (char-after pos) (electric-pair--with-uncached-syntax (table) (matching-paren (char-before (scan-sexps (point) 1)))))
the second argument fails with "Unbalanced parentheses" in Emacs 27, which
means that the whole expression fails, whereas in Emacs 26 both arguments
evaluate to 60 and the expression returns t.
Because of that `electric-pair--balance-info' returns ((nil . 60) nil .
60) in Emacs 27, instead of ((t . 60) t) in Emacs 26.
Because of that `electric-pair-skip-if-helps-balance' and
`electric-pair-default-skip-self' return nil in Emacs 27, instead of t in
Emacs 26.
Because of that `electric-pair-post-self-insert-function', called by
`post-self-insert-hook', does not skip the insertion of the right angle
bracket character.
The following snippet evaluates to "60" on both Emacs 26 and 27, so I
don't understand where the "Unbalanced parentheses" error could come from.
----
<div>
(progn
(electric-pair-mode 1)
(html-mode)
(let ((table (syntax-table))) (electric-pair--with-uncached-syntax (table) (matching-paren (char-before (scan-sexps 0 1))))))
----
Gregory
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Subject: bug#36006: electric-pair-mode fails to balance in certain cases
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Another note: this bug might in fact be specific to html-mode/sgml-mode.
As far as I can see electric-pair-mode works fine with emacs-lisp-mode,
c-mode, tex-mode, ... And with
(defun sgml-syntax-propertize (start end &optional rules-function))
the bug disappears.
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Subject: bug#36006: electric-pair-mode fails to balance in certain cases
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From: Gregory Heytings <ghe@HIDDEN>
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>
> Another note: this bug might in fact be specific to html-mode/sgml-mode.
> As far as I can see electric-pair-mode works fine with emacs-lisp-mode,
> c-mode, tex-mode, ... And with
>
> (defun sgml-syntax-propertize (start end &optional rules-function))
>
> the bug disappears.
>
A more specific note: removing `(put-text-property ... (string-to-syntax
"."))' in `sgml--syntax-propertize-ppss' also fixes the bug. So this bug
is indeed specific to html-mode/sgml-mode.
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Subject: bug#36006: electric-pair-mode fails to balance in certain cases
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Content preview: Gregory Heytings <ghe@HIDDEN> writes: > A more specific
note:
removing `(put-text-property > ... (string-to-syntax "."))' in
`sgml--syntax-propertize-ppss'
also > fixes the bug. So this bug is indeed specific to html-mode/sgml-mode.
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Gregory Heytings <ghe@HIDDEN> writes:
> A more specific note: removing `(put-text-property
> ... (string-to-syntax "."))' in `sgml--syntax-propertize-ppss' also
> fixes the bug. So this bug is indeed specific to html-mode/sgml-mode.
This problem is still present in Emacs 29.
I guess the issue here is that electric-pair-mode works by letting the
user insert the '>' before the final <div>, and then fixes things up (by
removing the extra '>' and moving point), but this defeats that:
(defun sgml--syntax-propertize-ppss (pos)
"Return PPSS at POS, fixing the syntax of any lone `>' along the way."
(cl-assert (>= pos (car sgml--syntax-propertize-ppss)))
(let ((ppss (parse-partial-sexp (car sgml--syntax-propertize-ppss) pos -1
nil (cdr sgml--syntax-propertize-ppss))))
(while (eq -1 (car ppss))
(put-text-property (1- (point)) (point)
'syntax-table (string-to-syntax "."))
;; Hack attack: rather than recompute the ppss from
;; (car sgml--syntax-propertize-ppss), we manually "fix it".
(setcar ppss 0)
(setq ppss (parse-partial-sexp (point) pos -1 nil ppss)))
(setcdr sgml--syntax-propertize-ppss ppss)
(setcar sgml--syntax-propertize-ppss pos)
ppss))
Because it's marking the extra '>' as punctuation?
--
(domestic pets only, the antidote for overdose, milk.)
bloggy blog: http://lars.ingebrigtsen.no
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1997 nCipher Corporation Ltd,
1994-97 Ian Jackson.