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Subject: bug#72068: show-paren-mode does not match Chinese parentheses correctly
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 Reproduce steps:

1. Emacs -Q

2. M-x eval-expression

```
(progn
  (setq cursor-type 'bar)
  (show-paren-mode 1))
```

3. Paste the following text in any .el file
```
(=E8=8B=B1=E6=96=87=E6=8B=AC=E5=8F=B7)
(=E8=8B=B1=E6=96=87 =E6=8B=AC=E5=8F=B7)
=EF=BC=88=E4=B8=AD=E6=96=87=E6=8B=AC=E5=8F=B7=EF=BC=89
=EF=BC=88=E4=B8=AD=E6=96=87 =E6=8B=AC=E5=8F=B7=EF=BC=89
```

4. Place the cursor at the first position (or last position) of each line.

The expected behavior: All of the four lines above match and highlight
correctly

The actual behavior: The 4th line mismatched. Note the middle SPC character=
.

P.s.

1. This issue only occurs in lisp-like modes. It is OK in c-mode and
python-mode.

2. =E3=80=90=E3=80=91=E3=80=8C=E3=80=8D=E3=80=8E=E3=80=8Fhave the same prob=
lem. They are also commonly used in lisp comment.

3.  A simple investigation found that it may be related to `scan-sexps` or
syntax-table, because  `(scan-sexps outside dir)` in the
`show-paren--default` returns the wrong value in the 4th case.

4. More screenshots and test code can be found in
https://emacs-china.org/t/show-paren-mode/15160

Emacs 29.3 on Windows.

Thanks.

Best regards
Siyuan Chen

--000000000000231583061d05cdbf
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<div dir=3D"ltr">
<div><span lang=3D"en"><span><span>Reproduce steps:</span></span><br></span=
></div><div><span lang=3D"en"><br></span></div><div>1. Emacs -Q</div><div><=
br></div><div>2. M-x eval-expression</div><div><br></div><div>```<br></div>=
<div>(progn<br>=C2=A0 (setq cursor-type &#39;bar)<br>=C2=A0 (show-paren-mod=
e 1))</div><div>```</div><div><br></div><div>3. Paste the following text in=
 any .el file</div><div>```</div><div>(=E8=8B=B1=E6=96=87=E6=8B=AC=E5=8F=B7=
)<br>(=E8=8B=B1=E6=96=87 =E6=8B=AC=E5=8F=B7)<br>=EF=BC=88=E4=B8=AD=E6=96=87=
=E6=8B=AC=E5=8F=B7=EF=BC=89<br>=EF=BC=88=E4=B8=AD=E6=96=87 =E6=8B=AC=E5=8F=
=B7=EF=BC=89<br></div><div>```</div><div><br></div><div>4. Place the cursor=
 at the first position (or last position) of each line.</div><div><br></div=
><div>The expected behavior: <span class=3D"gmail-HwtZe" lang=3D"en"><span =
class=3D"gmail-jCAhz gmail-JxVs2d gmail-ChMk0b"><span class=3D"gmail-ryNqvb=
">All of the four lines above match and highlight correctly</span></span></=
span></div><div><span class=3D"gmail-HwtZe" lang=3D"en"><span class=3D"gmai=
l-jCAhz gmail-JxVs2d gmail-ChMk0b"><span class=3D"gmail-ryNqvb"><br></span>=
</span></span></div><div><span class=3D"gmail-HwtZe" lang=3D"en"><span clas=
s=3D"gmail-jCAhz gmail-JxVs2d gmail-ChMk0b"><span class=3D"gmail-ryNqvb">Th=
e actual behavior: The 4th line mismatched. Note the </span></span></span>
<span class=3D"gmail-HwtZe" lang=3D"en"><span class=3D"gmail-jCAhz gmail-Jx=
Vs2d gmail-ChMk0b"><span class=3D"gmail-ryNqvb">middle</span></span></span>=
 <span class=3D"gmail-HwtZe" lang=3D"en"><span class=3D"gmail-jCAhz gmail-J=
xVs2d gmail-ChMk0b"><span class=3D"gmail-ryNqvb">SPC character.</span></spa=
n></span></div><div><span class=3D"gmail-HwtZe" lang=3D"en"><span class=3D"=
gmail-jCAhz gmail-JxVs2d gmail-ChMk0b"><span class=3D"gmail-ryNqvb"><br></s=
pan></span></span></div><div><span class=3D"gmail-HwtZe" lang=3D"en"><span =
class=3D"gmail-jCAhz gmail-JxVs2d gmail-ChMk0b"><span class=3D"gmail-ryNqvb=
">P.s.</span></span></span><br><br>1. This issue only occurs in lisp-like m=
odes. It is OK in c-mode and python-mode.<br><br>2. =E3=80=90=E3=80=91=E3=
=80=8C=E3=80=8D=E3=80=8E=E3=80=8Fhave the same problem.=20
<span class=3D"gmail-HwtZe" lang=3D"en"><span class=3D"gmail-jCAhz gmail-Jx=
Vs2d gmail-ChMk0b"><span class=3D"gmail-ryNqvb">They are also commonly used=
 in lisp comment.</span></span></span>

<br><br>3.=C2=A0 A simple investigation found that it may be related to `sc=
an-sexps` or syntax-table, because=C2=A0 `(scan-sexps outside dir)` in the =
`show-paren--default` returns the wrong value in the=20
<span class=3D"gmail-HwtZe" lang=3D"en"><span class=3D"gmail-jCAhz gmail-Jx=
Vs2d gmail-ChMk0b"><span class=3D"gmail-ryNqvb">4th</span></span></span> ca=
se.<br></div><div><br></div><div>4. More screenshots and test code can be f=
ound in=20
<a href=3D"https://emacs-china.org/t/show-paren-mode/15160">https://emacs-c=
hina.org/t/show-paren-mode/15160</a>

</div><div><span class=3D"gmail-HwtZe" lang=3D"en"><span class=3D"gmail-jCA=
hz gmail-JxVs2d gmail-ChMk0b"><span class=3D"gmail-ryNqvb"><br></span></spa=
n></span></div><div><span class=3D"gmail-HwtZe" lang=3D"en"><span class=3D"=
gmail-jCAhz gmail-JxVs2d gmail-ChMk0b"><span class=3D"gmail-ryNqvb">Emacs 2=
9.3 on Windows.<br></span></span></span></div><div><span class=3D"gmail-Hwt=
Ze" lang=3D"en"><span class=3D"gmail-jCAhz gmail-JxVs2d gmail-ChMk0b"><span=
 class=3D"gmail-ryNqvb"><br></span></span></span></div><div><span class=3D"=
gmail-HwtZe" lang=3D"en"><span class=3D"gmail-jCAhz gmail-JxVs2d gmail-ChMk=
0b"><span class=3D"gmail-ryNqvb">Thanks.<br></span></span></span></div><div=
><span class=3D"gmail-HwtZe" lang=3D"en"><span class=3D"gmail-jCAhz gmail-J=
xVs2d gmail-ChMk0b"><span class=3D"gmail-ryNqvb"><br></span></span></span><=
/div><div><span class=3D"gmail-HwtZe" lang=3D"en"><span class=3D"gmail-jCAh=
z gmail-JxVs2d gmail-ChMk0b"><span class=3D"gmail-ryNqvb">Best regards</spa=
n></span></span></div><div><span class=3D"gmail-HwtZe" lang=3D"en"><span cl=
ass=3D"gmail-jCAhz gmail-JxVs2d gmail-ChMk0b"><span class=3D"gmail-ryNqvb">=
Siyuan Chen<br></span></span></span>

</div><div><br></div>

<div><div><br></div><div><br></div></div></div>

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To: Siyuan Chen <chansey97@HIDDEN>
Subject: bug#72068: Acknowledgement (show-paren-mode does not match
 Chinese parentheses correctly)
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Message sent to bug-gnu-emacs@HIDDEN:

Subject: bug#72068: show-paren-mode does not match Chinese parentheses correctly
Resent-From: Eli Zaretskii <eliz@HIDDEN>
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To: Siyuan Chen <chansey97@HIDDEN>, Stefan Monnier <monnier@HIDDEN>
Cc: 72068 <at> debbugs.gnu.org
Date: Fri, 12 Jul 2024 09:02:49 +0300
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From: Eli Zaretskii <eliz@HIDDEN>
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 (message from Siyuan Chen on Fri, 12 Jul 2024 13:03:42 +0800)
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> From: Siyuan Chen <chansey97@HIDDEN>
> Date: Fri, 12 Jul 2024 13:03:42 +0800
> 
> Reproduce steps:
> 
> 1. Emacs -Q
> 
> 2. M-x eval-expression
> 
> ```
> (progn
>   (setq cursor-type 'bar)
>   (show-paren-mode 1))
> ```
> 
> 3. Paste the following text in any .el file
> ```
> (英文括号)
> (英文 括号)
> （中文括号）
> （中文 括号）
> ```
> 
> 4. Place the cursor at the first position (or last position) of each line.
> 
> The expected behavior: All of the four lines above match and highlight correctly
> 
> The actual behavior: The 4th line mismatched. Note the middle SPC character.
> 
> P.s.
> 
> 1. This issue only occurs in lisp-like modes. It is OK in c-mode and python-mode.
> 
> 2. 【】「」『』have the same problem. They are also commonly used in lisp comment. 
> 
> 3.  A simple investigation found that it may be related to `scan-sexps` or syntax-table, because  `(scan-sexps
> outside dir)` in the `show-paren--default` returns the wrong value in the 4th case.
> 
> 4. More screenshots and test code can be found in https://emacs-china.org/t/show-paren-mode/15160 
> 
> Emacs 29.3 on Windows.

I'm not sure this is a bug, since I think Lisp allows those characters
to be treated as symbol-constituent.  Stefan, am I right?

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Subject: bug#72068: show-paren-mode does not match Chinese parentheses correctly
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In-Reply-To: <86y167kv06.fsf@HIDDEN> (Eli Zaretskii's message of "Fri, 12 Jul
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 <86y167kv06.fsf@HIDDEN>
Date: Fri, 12 Jul 2024 08:45:22 -0400
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Eli Zaretskii [2024-07-12 09:02:49] wrote:
> I'm not sure this is a bug, since I think Lisp allows those characters
> to be treated as symbol-constituent.  Stefan, am I right?

I think that's the idea, indeed.  Of course, we don't have to obey the
Emacs Lisp syntax, but I think it makes sense to do so.
Admittedly, it would be nice to allow the use of other syntax rules inside
comments and string for these kinds of situations.


        Stefan

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severity 72068 wishlist
thanks

Stefan Monnier via "Bug reports for GNU Emacs, the Swiss army knife of
text editors" <bug-gnu-emacs@HIDDEN> writes:

> Eli Zaretskii [2024-07-12 09:02:49] wrote:
>> I'm not sure this is a bug, since I think Lisp allows those characters
>> to be treated as symbol-constituent.  Stefan, am I right?
>
> I think that's the idea, indeed.  Of course, we don't have to obey the
> Emacs Lisp syntax, but I think it makes sense to do so.
> Admittedly, it would be nice to allow the use of other syntax rules inside
> comments and string for these kinds of situations.

I'm not sure if this should be closed as notabug or not, but I'm tagging
it as wishlist at least.  Feel free to close if that makes more sense.

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Subject: Re: bug#72068: show-paren-mode does not match Chinese parentheses
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severity 72068 wishlist
thanks

Stefan Monnier via "Bug reports for GNU Emacs, the Swiss army knife of
text editors" <bug-gnu-emacs@HIDDEN> writes:

> Eli Zaretskii [2024-07-12 09:02:49] wrote:
>> I'm not sure this is a bug, since I think Lisp allows those characters
>> to be treated as symbol-constituent.  Stefan, am I right?
>
> I think that's the idea, indeed.  Of course, we don't have to obey the
> Emacs Lisp syntax, but I think it makes sense to do so.
> Admittedly, it would be nice to allow the use of other syntax rules inside
> comments and string for these kinds of situations.

I'm not sure if this should be closed as notabug or not, but I'm tagging
it as wishlist at least.  Feel free to close if that makes more sense.

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