GNU bug report logs - #38658
perl-mode: EOF in same color as here doc text

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Package: emacs; Severity: minor; Reported by: 積丹尼 Dan Jacobson <jidanni@HIDDEN>; Keywords: confirmed; merged with #17980; dated Wed, 18 Dec 2019 13:43:01 UTC; Maintainer for emacs is bug-gnu-emacs@HIDDEN.
Forcibly Merged 17980 38658. Request was from Lars Ingebrigtsen <larsi@HIDDEN> to control <at> debbugs.gnu.org. Full text available.

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From: Lars Ingebrigtsen <larsi@HIDDEN>
To: Stefan Monnier <monnier@HIDDEN>
Subject: Re: bug#38658: perl-mode: EOF in same color as here doc text
References: <871rt1oiri.5.fsf@HIDDEN> <87lfisdq04.fsf@HIDDEN>
 <jwvk0yb265y.fsf-monnier+emacs@HIDDEN>
Date: Fri, 07 Aug 2020 08:49:32 +0200
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 Content preview:  Stefan Monnier <monnier@HIDDEN> writes: > First,
 I'll note that all the rest of font-lock highlights the comment > and string
 delimiters the same as the comment and string contents, > except for the
 `font-lock-comment-delimiter-face`, so yo [...] 
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Stefan Monnier <monnier@HIDDEN> writes:

> First, I'll note that all the rest of font-lock highlights the comment
> and string delimiters the same as the comment and string contents,
> except for the `font-lock-comment-delimiter-face`, so you might like to
> check how `font-lock-comment-delimiter-face` is done.

Hm, right...

I just noticed that heredocs in .sh files are fontified identically to
in Perl-mode, by the way.

>> We apparently want to put that syntax on at the end of the heredoc, but
>> stop fontifying at the start of the final EOF.
>
> Rather than "not fontify" the delimiter, I think it'll be much easier to
> add extra fontification to it.

Right.

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no
Information forwarded to bug-gnu-emacs@HIDDEN:
bug#38658; Package emacs. Full text available.

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From: Stefan Monnier <monnier@HIDDEN>
To: Lars Ingebrigtsen <larsi@HIDDEN>
Subject: Re: bug#38658: perl-mode: EOF in same color as here doc text
Message-ID: <jwvk0yb265y.fsf-monnier+emacs@HIDDEN>
References: <871rt1oiri.5.fsf@HIDDEN> <87lfisdq04.fsf@HIDDEN>
Date: Thu, 06 Aug 2020 10:39:00 -0400
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First, I'll note that all the rest of font-lock highlights the comment
and string delimiters the same as the comment and string contents,
except for the `font-lock-comment-delimiter-face`, so you might like to
check how `font-lock-comment-delimiter-face` is done.

> We apparently want to put that syntax on at the end of the heredoc, but
> stop fontifying at the start of the final EOF.

Rather than "not fontify" the delimiter, I think it'll be much easier to
add extra fontification to it.


        Stefan
Information forwarded to bug-gnu-emacs@HIDDEN:
bug#38658; Package emacs. Full text available.
Added tag(s) confirmed. Request was from Lars Ingebrigtsen <larsi@HIDDEN> to control <at> debbugs.gnu.org. Full text available.

Message received at 38658 <at> debbugs.gnu.org:


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From: Lars Ingebrigtsen <larsi@HIDDEN>
To: =?utf-8?B?56mN5Li55bC8?= Dan Jacobson <jidanni@HIDDEN>
Subject: Re: bug#38658: perl-mode: EOF in same color as here doc text
References: <871rt1oiri.5.fsf@HIDDEN>
Date: Thu, 06 Aug 2020 12:31:55 +0200
In-Reply-To: <871rt1oiri.5.fsf@HIDDEN> (=?utf-8?B?IuepjeS4ueWwvA==?=
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 Content preview:  積丹尼 Dan Jacobson <jidanni@HIDDEN> writes: > $ nl
    e.pl > 1 print <<EOF; > 2 bla > 3 EOF > $ emacs e.pl > > Why is line 1 in
    color A, and lines 2 and 3 in color B? > How about instead lines 1 and 3
   in color A, and line 2 in color B? 
 
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=E7=A9=8D=E4=B8=B9=E5=B0=BC Dan Jacobson <jidanni@HIDDEN> writes:

> $ nl e.pl
>      1  print <<EOF;
>      2  bla
>      3  EOF
> $ emacs e.pl
>
> Why is line 1 in color A, and lines 2 and 3 in color B?
> How about instead lines 1 and 3 in color A, and line 2 in color B?

This is apparently due to the following code:

(defun perl-syntax-propertize-special-constructs (limit)
[...]
      ;; A Here document.
      (let ((names (cdr (get-text-property (nth 8 state) 'syntax-table))))
        (when (cdr names)
          (setq names (reverse names))
          ;; Multiple heredocs on a single line, we have to search from the
          ;; beginning, since we don't know which names might be
          ;; before point.
          (goto-char (nth 8 state)))
        (while (and names
                    (re-search-forward
                     (pcase-let ((`(,name . ,indented) (pop names)))
                       (concat "^" (if indented "[ \t]*")
                               (regexp-quote name) "\n"))
                     limit 'move))
          (unless names
            (put-text-property (1- (point)) (point) 'syntax-table
                               (string-to-syntax "> c"))))))

We apparently want to put that syntax on at the end of the heredoc, but
stop fontifying at the start of the final EOF.  I poked around a bit in
the code to see whether I could make it do that, and...  I can't.

So I'm Cc-ing Stefan, who wrote this.  :-)

--=20
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no
Information forwarded to bug-gnu-emacs@HIDDEN:
bug#38658; Package emacs. Full text available.

Message received at submit <at> debbugs.gnu.org:


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From: =?utf-8?B?56mN5Li55bC8?= Dan Jacobson <jidanni@HIDDEN>
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Subject: perl-mode: EOF in same color as here doc text
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$ nl e.pl
     1  print <<EOF;
     2  bla
     3  EOF
$ emacs e.pl

Why is line 1 in color A, and lines 2 and 3 in color B?
How about instead lines 1 and 3 in color A, and line 2 in color B?
emacs-version "26.3"
Acknowledgement sent to 積丹尼 Dan Jacobson <jidanni@HIDDEN>:
New bug report received and forwarded. Copy sent to bug-gnu-emacs@HIDDEN. Full text available.
Report forwarded to bug-gnu-emacs@HIDDEN:
bug#38658; Package emacs. Full text available.
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Last modified: Fri, 7 Aug 2020 10:15:02 UTC

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Copyright (C) 1999 Darren O. Benham, 1997 nCipher Corporation Ltd, 1994-97 Ian Jackson.