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From: "Bob" <purchasebyemail1@comcast.net>
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Subject: show-paren-mode doesn't match when scope "::" operator is used :
	emacs 32.1.97
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Emacs 23.1.97:

 

When using the C++ scope operator "::", show-paren-mode gets confused:

 

------  Foo.cpp ------------------------------------

struct Foo1 {};

 

namespace X

{

  struct Foo2 {};

 

  template<class _Y>

  struct Bar;

 

  template<>

  struct Bar<::Foo1>         // "(show-paren-mode)" does not match `>` to
`<`

  {

  };

 

  template<>

  struct Bar<Foo2>           // "(show-paren-mode)" correctly matches `>` to
`<` 

  {

  };

}

---------------------------------------------


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found 6978 24.0.90




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Subject: Re: bug#6978: show-paren-mode doesn't match when scope "::" operator
 is used : emacs 32.1.97
To: Bob <purchasebyemail1@comcast.net>
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severity 6978 minor
found 6978 27.0.50
quit

"Bob" <purchasebyemail1@comcast.net> writes:

>
>
> Emacs 23.1.97:
>
>
>
> When using the C++ scope operator "::", show-paren-mode gets confused:
>
>
>
> ------  Foo.cpp ------------------------------------
>
> struct Foo1 {};
>
>
>
> namespace X
>
> {
>
>   struct Foo2 {};
>
>
>
>   template<class _Y>
>
>   struct Bar;
>
>
>
>   template<>
>
>   struct Bar<::Foo1>         // "(show-paren-mode)" does not match `>` to `<`
>
>   {
>
>   };
>
>
>
>   template<>
>
>   struct Bar<Foo2>           // "(show-paren-mode)" correctly matches `>` to `<`
>
>   {
>
>   };
>
> }
>
> ---------------------------------------------

I can reproduce this on current master.

Best regards,
Stefan Kangas




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To: Stefan Kangas <stefan@marxist.se>
Subject: Re: bug#6978: show-paren-mode doesn't match when scope "::" operator
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In article <mailman.1087.1570362019.2651.bug-gnu-emacs@gnu.org> you wrote:
> severity 6978 minor
> found 6978 27.0.50
> quit

> "Bob" <purchasebyemail1@comcast.net> writes:

>>
>>
>> Emacs 23.1.97:
>>
>>
>>
>> When using the C++ scope operator "::", show-paren-mode gets confused:
>>
>>
>>
>> ------  Foo.cpp ------------------------------------
>>
>> struct Foo1 {};
>>
>>
>>
>> namespace X
>>
>> {
>>
>>   struct Foo2 {};
>>
>>
>>
>>   template<class _Y>
>>
>>   struct Bar;
>>
>>
>>
>>   template<>
>>
>>   struct Bar<::Foo1>         // "(show-paren-mode)" does not match `>` to `<`
>>
>>   {
>>
>>   };
>>
>>
>>
>>   template<>
>>
>>   struct Bar<Foo2>           // "(show-paren-mode)" correctly matches `>` to `<`
>>
>>   {
>>
>>   };
>>
>> }
>>
>> ---------------------------------------------

> I can reproduce this on current master.

This is a CC Mode bug.  The pertinent < and > are not being marked with
syntax-table text properties, hence can't be recognised as parens.

I'll be looking into this.

> Best regards,
> Stefan Kangas

-- 
Alan Mackenzie (Nuremberg, Germany).





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Date: Sun, 6 Oct 2019 19:56:19 +0100
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Subject: Re: bug#6978: show-paren-mode doesn't match when scope "::" operator
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To: Alan Mackenzie <acm@muc.de>
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--0000000000002e37f10594427fbd
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On Sun, 6 Oct 2019 at 18:39, Alan Mackenzie <acm@muc.de> wrote:

> In article <mailman.1087.1570362019.2651.bug-gnu-emacs@gnu.org> you wrote:
> > "Bob" <purchasebyemail1@comcast.net> writes:
> >>   struct Bar<::Foo1>         // "(show-paren-mode)" does not match `>`
> to `<`
> The pertinent < and > are not being marked with
> syntax-table text properties, hence can't be recognised as parens.
>

Digraphs? (Just a thought.)

Best,
Richard.

--0000000000002e37f10594427fbd
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><div class=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail=
_attr">On Sun, 6 Oct 2019 at 18:39, Alan Mackenzie &lt;<a href=3D"mailto:ac=
m@muc.de">acm@muc.de</a>&gt; wrote:<br></div><blockquote class=3D"gmail_quo=
te" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204=
);padding-left:1ex">In article &lt;<a href=3D"mailto:mailman.1087.157036201=
9.2651.bug-gnu-emacs@gnu.org" target=3D"_blank">mailman.1087.1570362019.265=
1.bug-gnu-emacs@gnu.org</a>&gt; you wrote:<br>&gt; &quot;Bob&quot; &lt;<a h=
ref=3D"mailto:purchasebyemail1@comcast.net" target=3D"_blank">purchasebyema=
il1@comcast.net</a>&gt; writes:<br>
&gt;&gt;=C2=A0 =C2=A0struct Bar&lt;::Foo1&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0// &quot;(show-paren-mode)&quot; does not match `&gt;` to `&lt;`<br>T=
he pertinent &lt; and &gt; are not being marked with<br>
syntax-table text properties, hence can&#39;t be recognised as parens.<br><=
/blockquote><div><br></div><div>Digraphs? (Just a thought.)</div><div><br><=
/div><div>Best,</div><div>Richard.</div><div><br></div></div></div>

--0000000000002e37f10594427fbd--




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Hello, Richard.

In article <mailman.1131.1570388227.2651.bug-gnu-emacs@gnu.org> you wrote:
> [-- text/plain, encoding 7bit, charset: UTF-8, 15 lines --]

> On Sun, 6 Oct 2019 at 18:39, Alan Mackenzie <acm@muc.de> wrote:

>> In article <mailman.1087.1570362019.2651.bug-gnu-emacs@gnu.org> you wrote:
>> > "Bob" <purchasebyemail1@comcast.net> writes:
>> >>   struct Bar<::Foo1>         // "(show-paren-mode)" does not match `>`
>> >>   to `<`
>> The pertinent < and > are not being marked with
>> syntax-table text properties, hence can't be recognised as parens.
>>

> Digraphs? (Just a thought.)

Spot on!

I just need to find a way of removing <: from the regexp used to check
the opening <.  Shouldn't be too difficult.

Why on earth are digraphs still an issue?  Why are they still in the C
and C++ standards?  It's been several decades since "complete" character
sets (here, meaning ASCII) superseded incomplete ones.

> Best,
> Richard.

-- 
Alan Mackenzie (Nuremberg, Germany).





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Subject: Re: bug#6978: show-paren-mode doesn't match when scope "::" operator
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Hello, Stefan and Richard.

On Sun, Oct 06, 2019 at 19:16:07 -0000, Alan Mackenzie wrote:
> In article <mailman.1131.1570388227.2651.bug-gnu-emacs@gnu.org> you wrote:
> > [-- text/plain, encoding 7bit, charset: UTF-8, 15 lines --]

> > On Sun, 6 Oct 2019 at 18:39, Alan Mackenzie <acm@muc.de> wrote:

> >> In article <mailman.1087.1570362019.2651.bug-gnu-emacs@gnu.org> you wrote:
> >> > "Bob" <purchasebyemail1@comcast.net> writes:
> >> >>   struct Bar<::Foo1>         // "(show-paren-mode)" does not match `>`
> >> >>   to `<`
> >> The pertinent < and > are not being marked with
> >> syntax-table text properties, hence can't be recognised as parens.

> > Digraphs? (Just a thought.)

> Spot on!

> I just need to find a way of removing <: from the regexp used to check
> the opening <.  Shouldn't be too difficult.

The following seems to fix the bug:



diff -r b0943da37755 cc-langs.el
--- a/cc-langs.el	Thu Oct 03 14:14:45 2019 +0000
+++ b/cc-langs.el	Sun Oct 06 20:08:43 2019 +0000
@@ -1382,11 +1382,11 @@
 
 (c-lang-defconst c-<-op-cont-regexp
   ;; Regexp matching the second and subsequent characters of all
-  ;; multicharacter tokens that begin with "<".
+  ;; multicharacter tokens that begin with "<", apart from digraphs.
   t (c-make-keywords-re nil
       (c-filter-ops (c-lang-const c-all-op-syntax-tokens)
 		    t
-		    "\\`<."
+		    "\\`<[^:]"
 		    (lambda (op) (substring op 1)))))
 (c-lang-defvar c-<-op-cont-regexp (c-lang-const c-<-op-cont-regexp))
 


> > Best,
> > Richard.

-- 
Alan Mackenzie (Nuremberg, Germany).




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Hi Alan,

Alan Mackenzie <acm@muc.de> writes:

> The following seems to fix the bug:

I can verify that applying your patch to current master fixes the bug
for me.  I think you can push and close this bug.  Thanks for fixing
it.

Best regards,
Stefan Kangas




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Hello, Stefan.

On Sun, Oct 06, 2019 at 22:21:39 +0200, Stefan Kangas wrote:
> Hi Alan,

> Alan Mackenzie <acm@muc.de> writes:

> > The following seems to fix the bug:

> I can verify that applying your patch to current master fixes the bug
> for me.  I think you can push and close this bug.  Thanks for fixing
> it.

I've actually developed a longer, more rigorous patch, which I've
committed.  The C++ standard says that although <:: should be recognised
as a template opener, <::>, and <::: should not be.  The committed patch
follows this.

I'm closing the bug with this post.

> Best regards,
> Stefan Kangas

-- 
Alan Mackenzie (Nuremberg, Germany).




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Message-Id: bug archived.
Date: Sat, 09 Nov 2019 12:24:06 +0000
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