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* bug#70435: 30.0.50; cc-mode: <> are sometimes not reconized as parentheses
@ 2024-04-17 10:47 Herman, Géza
  2024-04-27  8:33 ` Eli Zaretskii
  2024-04-28 15:44 ` Alan Mackenzie
  0 siblings, 2 replies; 14+ messages in thread
From: Herman, Géza @ 2024-04-17 10:47 UTC (permalink / raw)
  To: 70435


This is a subtle bug.  In some cases, <> template delimiters are
not recognized as delimiters, but punctuation characters.

Repro:
- put the yasnippet file (included below) into
<emacs-config-dir>/snippets/c++-mode/something
- install yasnippet
- start emacs
- M-x c++-mode
- M-x yas-minor-mode
- load snippets with "M-x yas-reload-all"
- write "ig", then press TAB to "yas-expand" the snippet
- move the cursor on the opening "<", and execute "M-x describe-char"
- notice that it will say "syntax: . which means: punctuation"
- if you edit the buffer (like add a space somewhere), and execute
describe-char again, Emacs will say "syntax: > which means: open,
matches >", so the syntax class becomes correct.

A possible explanation for this is that yasnippet edits the buffer in a
way that cc-mode doesn't notices the edit, so it has no chance to put
the correct syntax info on the inserted characters.

This is the snippet file (a simple template declaration):

--8<---------------cut here---------------start------------->8---
# -*- mode: snippet -*-
# name: something
# key: ig
# --
template <${1:typename AAA}> struct Foo;
--8<---------------cut here---------------end--------------->8---



In GNU Emacs 30.0.50 (build 1, x86_64-pc-linux-gnu, cairo version
 1.18.0) of 2024-04-12 built on okoska
Repository revision: b83d0d07bb316cd851517897a9d688d639441f90
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^ permalink raw reply	[flat|nested] 14+ messages in thread

* bug#70435: 30.0.50; cc-mode: <> are sometimes not reconized as parentheses
  2024-04-17 10:47 bug#70435: 30.0.50; cc-mode: <> are sometimes not reconized as parentheses Herman, Géza
@ 2024-04-27  8:33 ` Eli Zaretskii
  2024-04-27 10:08   ` Alan Mackenzie
  2024-04-28 15:44 ` Alan Mackenzie
  1 sibling, 1 reply; 14+ messages in thread
From: Eli Zaretskii @ 2024-04-27  8:33 UTC (permalink / raw)
  To: Herman Géza, Alan Mackenzie; +Cc: 70435

> From: Herman@debbugs.gnu.org, Géza <geza.herman@gmail.com>
> Date: Wed, 17 Apr 2024 12:47:25 +0200
> 
> 
> This is a subtle bug.  In some cases, <> template delimiters are
> not recognized as delimiters, but punctuation characters.
> 
> Repro:
> - put the yasnippet file (included below) into
> <emacs-config-dir>/snippets/c++-mode/something
> - install yasnippet
> - start emacs
> - M-x c++-mode
> - M-x yas-minor-mode
> - load snippets with "M-x yas-reload-all"
> - write "ig", then press TAB to "yas-expand" the snippet
> - move the cursor on the opening "<", and execute "M-x describe-char"
> - notice that it will say "syntax: . which means: punctuation"
> - if you edit the buffer (like add a space somewhere), and execute
> describe-char again, Emacs will say "syntax: > which means: open,
> matches >", so the syntax class becomes correct.
> 
> A possible explanation for this is that yasnippet edits the buffer in a
> way that cc-mode doesn't notices the edit, so it has no chance to put
> the correct syntax info on the inserted characters.
> 
> This is the snippet file (a simple template declaration):
> 
> --8<---------------cut here---------------start------------->8---
> # -*- mode: snippet -*-
> # name: something
> # key: ig
> # --
> template <${1:typename AAA}> struct Foo;
> --8<---------------cut here---------------end--------------->8---

Alan, could you please look into this?





^ permalink raw reply	[flat|nested] 14+ messages in thread

* bug#70435: 30.0.50; cc-mode: <> are sometimes not reconized as parentheses
  2024-04-27  8:33 ` Eli Zaretskii
@ 2024-04-27 10:08   ` Alan Mackenzie
  0 siblings, 0 replies; 14+ messages in thread
From: Alan Mackenzie @ 2024-04-27 10:08 UTC (permalink / raw)
  To: Eli Zaretskii; +Cc: 70435, Herman Géza

Hello, Eli.

On Sat, Apr 27, 2024 at 11:33:38 +0300, Eli Zaretskii wrote:
> > From: Herman@debbugs.gnu.org, Géza <geza.herman@gmail.com>
> > Date: Wed, 17 Apr 2024 12:47:25 +0200


> > This is a subtle bug.  In some cases, <> template delimiters are
> > not recognized as delimiters, but punctuation characters.

> > Repro:
> > - put the yasnippet file (included below) into
> > <emacs-config-dir>/snippets/c++-mode/something
> > - install yasnippet
> > - start emacs
> > - M-x c++-mode
> > - M-x yas-minor-mode
> > - load snippets with "M-x yas-reload-all"
> > - write "ig", then press TAB to "yas-expand" the snippet
> > - move the cursor on the opening "<", and execute "M-x describe-char"
> > - notice that it will say "syntax: . which means: punctuation"
> > - if you edit the buffer (like add a space somewhere), and execute
> > describe-char again, Emacs will say "syntax: > which means: open,
> > matches >", so the syntax class becomes correct.

> > A possible explanation for this is that yasnippet edits the buffer in a
> > way that cc-mode doesn't notices the edit, so it has no chance to put
> > the correct syntax info on the inserted characters.

> > This is the snippet file (a simple template declaration):

> > --8<---------------cut here---------------start------------->8---
> > # -*- mode: snippet -*-
> > # name: something
> > # key: ig
> > # --
> > template <${1:typename AAA}> struct Foo;
> > --8<---------------cut here---------------end--------------->8---

> Alan, could you please look into this?

Yes, I will.  Thanks!

-- 
Alan Mackenzie (Nuremberg, Germany).





^ permalink raw reply	[flat|nested] 14+ messages in thread

* bug#70435: 30.0.50; cc-mode: <> are sometimes not reconized as parentheses
  2024-04-17 10:47 bug#70435: 30.0.50; cc-mode: <> are sometimes not reconized as parentheses Herman, Géza
  2024-04-27  8:33 ` Eli Zaretskii
@ 2024-04-28 15:44 ` Alan Mackenzie
  2024-04-28 16:47   ` Herman, Géza
  1 sibling, 1 reply; 14+ messages in thread
From: Alan Mackenzie @ 2024-04-28 15:44 UTC (permalink / raw)
  To: Herman, Géza; +Cc: acm, Eli Zaretskii, 70435

Hello, Géza.

On Wed, Apr 17, 2024 at 12:47:25 +0200, Herman wrote:

> This is a subtle bug.  In some cases, <> template delimiters are
> not recognized as delimiters, but punctuation characters.

> Repro:
> - put the yasnippet file (included below) into
> <emacs-config-dir>/snippets/c++-mode/something
> - install yasnippet
> - start emacs
> - M-x c++-mode
> - M-x yas-minor-mode
> - load snippets with "M-x yas-reload-all"
> - write "ig", then press TAB to "yas-expand" the snippet
> - move the cursor on the opening "<", and execute "M-x describe-char"
> - notice that it will say "syntax: . which means: punctuation"
> - if you edit the buffer (like add a space somewhere), and execute
> describe-char again, Emacs will say "syntax: > which means: open,
> matches >", so the syntax class becomes correct.

You've been a little less than fully explicit, but I think you're
executing these commands in the *scratch* buffer.  The first two lines,
which are commented out in emacs-lisp-mode, are no longer commented out
in C++ Mode.  There is a whole line of garbage after the last end of
statement marker, the (double) semicolon on line 2.

On using ig<TAB> to insert the snippet, it is hardly surprising that CC
Mode's syntactic analysis gets confused.  If you first comment out those
first two lines (put the region around them and do C-c C-c), then the
inserted snippet appears to get the correct syntax on its template
markers.

I don't think there's a bug here.  If you could show ig<TAB> producing
the effect when typed inside a syntactically correct context, things
might be different.  Can you reproduce the effect in correct C++ code?

> A possible explanation for this is that yasnippet edits the buffer in a
> way that cc-mode doesn't notices the edit, so it has no chance to put
> the correct syntax info on the inserted characters.

> This is the snippet file (a simple template declaration):

> --8<---------------cut here---------------start------------->8---
> # -*- mode: snippet -*-
> # name: something
> # key: ig
> # --
> template <${1:typename AAA}> struct Foo;
> --8<---------------cut here---------------end--------------->8---



> In GNU Emacs 30.0.50 (build 1, x86_64-pc-linux-gnu, cairo version
>  1.18.0) of 2024-04-12 built on okoska
> Repository revision: b83d0d07bb316cd851517897a9d688d639441f90
> Repository branch: my-modifications
> Windowing system distributor 'The X.Org Foundation', version 11.0.12101008
> System Description: Debian GNU/Linux trixie/sid

-- 
Alan Mackenzie (Nuremberg, Germany).





^ permalink raw reply	[flat|nested] 14+ messages in thread

* bug#70435: 30.0.50; cc-mode: <> are sometimes not reconized as parentheses
  2024-04-28 15:44 ` Alan Mackenzie
@ 2024-04-28 16:47   ` Herman, Géza
  2024-04-28 20:31     ` Alan Mackenzie
  2024-04-29 15:53     ` Alan Mackenzie
  0 siblings, 2 replies; 14+ messages in thread
From: Herman, Géza @ 2024-04-28 16:47 UTC (permalink / raw)
  To: Alan Mackenzie; +Cc: Herman, Eli Zaretskii, 70435, Géza

Hello Alan,

Alan Mackenzie <acm@muc.de> writes:

> You've been a little less than fully explicit, but I think 
> you're
> executing these commands in the *scratch* buffer.  The first two 
> lines,
> which are commented out in emacs-lisp-mode, are no longer 
> commented out
> in C++ Mode.  There is a whole line of garbage after the last 
> end of
> statement marker, the (double) semicolon on line 2.
>
> On using ig<TAB> to insert the snippet, it is hardly surprising 
> that CC
> Mode's syntactic analysis gets confused.  If you first comment 
> out those
> first two lines (put the region around them and do C-c C-c), 
> then the
> inserted snippet appears to get the correct syntax on its 
> template
> markers.
>
> I don't think there's a bug here.  If you could show ig<TAB> 
> producing
> the effect when typed inside a syntactically correct context, 
> things
> might be different.  Can you reproduce the effect in correct C++ 
> code?

You're right, it seems that the example I provided wasn't the best 
(this issue happens with me in real code, I tried to create a 
minimal reproducible example).

If you delete the garbage from the scratch buffer, the bug doesn't 
reproduce indeed.  But, if you run (setq 
font-lock-maximum-decoration 2) before switching to c++-mode, the 
issue reproduces with an empty scratch buffer.  I use this setting 
because font-lock runs much faster this way, and I rely on the LSP 
server to do the "full" highlighting.

Sorry about the bad example, here are the fixed repro steps:

Repro:
- put the yasnippet file (included below) into
<emacs-config-dir>/snippets/c++-mode/something
- install yasnippet
- start emacs, scratch buffer appears
- delete the contents of the scratch buffer
- M-: (setq font-lock-maximum-decoration 2)
- M-x c++-mode
- M-x yas-minor-mode
- load snippets with "M-x yas-reload-all"
- write "ig", then press TAB to "yas-expand" the snippet
- move the cursor on the opening "<", and execute "M-x 
  describe-char"
- notice that it will say "syntax: . which means: punctuation"
- if you edit the buffer (like add a space somewhere), and execute
describe-char again, Emacs will say "syntax: > which means: open,
matches >", so the syntax class becomes correct.

Geza





^ permalink raw reply	[flat|nested] 14+ messages in thread

* bug#70435: 30.0.50; cc-mode: <> are sometimes not reconized as parentheses
  2024-04-28 16:47   ` Herman, Géza
@ 2024-04-28 20:31     ` Alan Mackenzie
  2024-04-29 15:53     ` Alan Mackenzie
  1 sibling, 0 replies; 14+ messages in thread
From: Alan Mackenzie @ 2024-04-28 20:31 UTC (permalink / raw)
  To: Herman Géza; +Cc: acm, Eli Zaretskii, 70435

Hello again, Géza.

On Sun, Apr 28, 2024 at 18:47:47 +0200, Herman, Géza wrote:
> Hello Alan,

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

> > You've been a little less than fully explicit, but I think you're
> > executing these commands in the *scratch* buffer.  The first two
> > lines, which are commented out in emacs-lisp-mode, are no longer
> > commented out in C++ Mode.  There is a whole line of garbage after
> > the last end of statement marker, the (double) semicolon on line 2.

> > On using ig<TAB> to insert the snippet, it is hardly surprising that
> > CC Mode's syntactic analysis gets confused.  If you first comment
> > out those first two lines (put the region around them and do C-c
> > C-c), then the inserted snippet appears to get the correct syntax on
> > its template markers.

> > I don't think there's a bug here.  If you could show ig<TAB>
> > producing the effect when typed inside a syntactically correct
> > context, things might be different.  Can you reproduce the effect in
> > correct C++ code?

> You're right, it seems that the example I provided wasn't the best 
> (this issue happens with me in real code, I tried to create a 
> minimal reproducible example).

That's always appreciated.

> If you delete the garbage from the scratch buffer, the bug doesn't 
> reproduce indeed.  But, if you run (setq 
> font-lock-maximum-decoration 2) before switching to c++-mode, the 
> issue reproduces with an empty scratch buffer.  I use this setting 
> because font-lock runs much faster this way, and I rely on the LSP 
> server to do the "full" highlighting.

I confirm I can reproduce the bug with font-lock-maximum-decoration set
to 2.  I'll look into it.

> Sorry about the bad example, here are the fixed repro steps:

> Repro:
> - put the yasnippet file (included below) into
> <emacs-config-dir>/snippets/c++-mode/something
> - install yasnippet
> - start emacs, scratch buffer appears
> - delete the contents of the scratch buffer
> - M-: (setq font-lock-maximum-decoration 2)
> - M-x c++-mode
> - M-x yas-minor-mode
> - load snippets with "M-x yas-reload-all"
> - write "ig", then press TAB to "yas-expand" the snippet
> - move the cursor on the opening "<", and execute "M-x 
>   describe-char"
> - notice that it will say "syntax: . which means: punctuation"
> - if you edit the buffer (like add a space somewhere), and execute
> describe-char again, Emacs will say "syntax: > which means: open,
> matches >", so the syntax class becomes correct.

> Geza

-- 
Alan Mackenzie (Nuremberg, Germany).





^ permalink raw reply	[flat|nested] 14+ messages in thread

* bug#70435: 30.0.50; cc-mode: <> are sometimes not reconized as parentheses
  2024-04-28 16:47   ` Herman, Géza
  2024-04-28 20:31     ` Alan Mackenzie
@ 2024-04-29 15:53     ` Alan Mackenzie
  2024-04-29 17:21       ` Herman, Géza
  1 sibling, 1 reply; 14+ messages in thread
From: Alan Mackenzie @ 2024-04-29 15:53 UTC (permalink / raw)
  To: Herman Géza; +Cc: acm, Eli Zaretskii, 70435

Hello, Géza.

On Sun, Apr 28, 2024 at 18:47:47 +0200, Herman, Géza wrote:
> Hello Alan,

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

> > You've been a little less than fully explicit, but I think you're
> > executing these commands in the *scratch* buffer.  The first two
> > lines, which are commented out in emacs-lisp-mode, are no longer
> > commented out in C++ Mode.  There is a whole line of garbage after
> > the last end of statement marker, the (double) semicolon on line 2.

> > On using ig<TAB> to insert the snippet, it is hardly surprising that
> > CC Mode's syntactic analysis gets confused.  If you first comment
> > out those first two lines (put the region around them and do C-c
> > C-c), then the inserted snippet appears to get the correct syntax on
> > its template markers.

> > I don't think there's a bug here.  If you could show ig<TAB>
> > producing the effect when typed inside a syntactically correct
> > context, things might be different.  Can you reproduce the effect in
> > correct C++ code?

> You're right, it seems that the example I provided wasn't the best
> (this issue happens with me in real code, I tried to create a minimal
> reproducible example).

> If you delete the garbage from the scratch buffer, the bug doesn't
> reproduce indeed.  But, if you run (setq font-lock-maximum-decoration
> 2) before switching to c++-mode, the issue reproduces with an empty
> scratch buffer.  I use this setting because font-lock runs much faster
> this way, and I rely on the LSP server to do the "full" highlighting.

OK, as already said, I can reproduce the bug this way.  Thanks!

> Sorry about the bad example, here are the fixed repro steps:

> Repro:
> - put the yasnippet file (included below) into
> <emacs-config-dir>/snippets/c++-mode/something
> - install yasnippet
> - start emacs, scratch buffer appears
> - delete the contents of the scratch buffer
> - M-: (setq font-lock-maximum-decoration 2)
> - M-x c++-mode
> - M-x yas-minor-mode
> - load snippets with "M-x yas-reload-all"
> - write "ig", then press TAB to "yas-expand" the snippet
> - move the cursor on the opening "<", and execute "M-x 
>   describe-char"
> - notice that it will say "syntax: . which means: punctuation"
> - if you edit the buffer (like add a space somewhere), and execute
> describe-char again, Emacs will say "syntax: > which means: open,
> matches >", so the syntax class becomes correct.

I have a fix, I think.  It is actually a two line fix, removing a test
from the top of a function, but it involves reindenting the entire rest
of the function.

Please apply the patch below, recompile cc-engine.el, then load the
resulting CC Mode into a running Emacs.  Please test it on your real C++
code, and let me know if the bug is actually fixed.  Thanks!


diff -r 072940aaeb40 cc-engine.el
--- a/cc-engine.el	Sun Apr 14 07:59:01 2024 +0000
+++ b/cc-engine.el	Mon Apr 29 15:42:05 2024 +0000
@@ -7172,153 +7172,152 @@
   ;; FIXME!!!  This routine ignores the possibility of macros entirely.
   ;; 2010-01-29.
 
-  (when (> end beg)
-    ;; Extend the region (BEG END) to deal with any complicating literals.
-    (let* ((lit-search-beg (if (memq (char-before beg) '(?/ ?*))
-			       (1- beg) beg))
-	   (lit-search-end (if (memq (char-after end) '(?/ ?*))
-			       (1+ end) end))
-	   ;; Note we can't use c-full-pp-to-literal here, since we haven't
-	   ;; yet applied syntax-table properties to ends of lines, etc.
-	   (lit-search-beg-s (c-semi-pp-to-literal lit-search-beg))
-	   (beg-literal-beg (car (cddr lit-search-beg-s)))
-	   (lit-search-end-s (c-semi-pp-to-literal lit-search-end))
-	   (end-literal-beg (car (cddr lit-search-end-s)))
-	   (beg-literal-end (c-end-of-literal lit-search-beg-s lit-search-beg))
-	   (end-literal-end (c-end-of-literal lit-search-end-s lit-search-end))
-	   new-beg new-end search-region)
-
-      ;; Determine any new end of literal resulting from the insertion/deletion.
-      (setq search-region
-	    (if (and (eq beg-literal-beg end-literal-beg)
-		     (eq beg-literal-end end-literal-end))
-		(if beg-literal-beg
-		    nil
-		  (cons beg
-			(max end
-			     (or beg-literal-end (point-min))
-			     (or end-literal-end (point-min)))))
-	      (cons (or beg-literal-beg beg)
-		    (max end
-			 (or beg-literal-end (point-min))
-			 (or end-literal-end (point-min))))))
-
-      (when search-region
-	;; If we've just inserted text, mask its syntaxes temporarily so that
-	;; they won't interfere with the undoing of the properties on the <s
-	;; and >s.
-	(c-save-buffer-state (syn-tab-settings syn-tab-value
-					       swap-open-string-ends)
-	  (unwind-protect
-	      (progn
-		(when old-len
-		  ;; Special case: If a \ has just been inserted into a
-		  ;; string, escaping or unescaping a LF, temporarily swap
-		  ;; the LF's syntax-table text property with that of the
-		  ;; former end of the open string.
-		  (goto-char end)
-		  (when (and (eq (cadr lit-search-beg-s) 'string)
-			     (not (eq beg-literal-end end-literal-end))
-			     (skip-chars-forward "\\\\")
-			     (eq (char-after) ?\n)
-			     (not (zerop (skip-chars-backward "\\\\"))))
-		    (setq swap-open-string-ends t)
-		    (if (c-get-char-property (1- beg-literal-end)
-					     'syntax-table)
-			(progn
-			  (c-clear-char-property (1- beg-literal-end)
-						 'syntax-table)
-			  (c-put-string-fence (1- end-literal-end)))
-		      (c-put-string-fence (1- beg-literal-end))
-		      (c-clear-char-property (1- end-literal-end)
-					     'syntax-table)))
-
-		  ;; Save current settings of the 'syntax-table property in
-		  ;; (BEG END), then splat these with the punctuation value.
-		  (goto-char beg)
-		  (while (setq syn-tab-value
-			       (c-search-forward-non-nil-char-property
-				'syntax-table end))
-		    (when (not (c-get-char-property (1- (point)) 'category))
-		      (push (cons (1- (point)) syn-tab-value)
-			    syn-tab-settings)))
-
-		  (c-put-char-properties beg end 'syntax-table '(1))
-		  ;; If an open string's opener has just been neutralized,
-		  ;; do the same to the terminating LF.
-		  (when (and end-literal-end
-			     (eq (char-before end-literal-end) ?\n)
-			     (equal (c-get-char-property
-				     (1- end-literal-end) 'syntax-table)
-				    '(15)))
-		    (push (cons (1- end-literal-end) '(15)) syn-tab-settings)
-		    (c-put-char-property (1- end-literal-end) 'syntax-table
-					 '(1))))
-
-		(let
-		    ((beg-lit-start (progn (goto-char beg) (c-literal-start)))
-		     beg-limit end-limit <>-pos)
-		  ;; Locate the earliest < after the barrier before the
-		  ;; changed region, which isn't already marked as a paren.
-		  (goto-char (or beg-lit-start beg))
-		  (setq beg-limit (c-determine-limit 5000))
-
-		  ;; Remove the syntax-table/category properties from each pertinent <...>
-		  ;; pair.  Firstly, the ones with the < before beg and > after beg....
-		  (goto-char (cdr search-region))
-		  (while (progn (c-syntactic-skip-backward "^;{}<" beg-limit)
-				(eq (char-before) ?<))
-		    (c-backward-token-2)
-		    (when (eq (char-after) ?<)
-		      (when (setq <>-pos (c-clear-<-pair-props-if-match-after
-					  (car search-region)))
-			(setq new-end <>-pos))
-		      (setq new-beg (point))))
-
-		  ;; ...Then the ones with < before end and > after end.
-		  (goto-char (car search-region))
-		  (setq end-limit (c-determine-+ve-limit 5000))
-		  (while (and (c-syntactic-re-search-forward "[;{}>]" end-limit 'end)
-			      (eq (char-before) ?>))
-		    (when (eq (char-before) ?>)
-		      (if (and (looking-at c->-op-cont-regexp)
-			       (not (eq (char-after) ?>)))
-			  (goto-char (match-end 0))
-			(when
-			    (and (setq <>-pos
-				       (c-clear->-pair-props-if-match-before
-					(cdr search-region)
-					(1- (point))))
-				 (or (not new-beg)
-				     (< <>-pos new-beg)))
-			  (setq new-beg <>-pos))
-			(when (or (not new-end) (> (point) new-end))
-			  (setq new-end (point))))))))
-
-	    (when old-len
-	      (c-clear-char-properties beg end 'syntax-table)
-	      (dolist (elt syn-tab-settings)
-		(if (cdr elt)
-		    (c-put-char-property (car elt) 'syntax-table (cdr elt)))))
-	    ;; Swap the '(15) syntax-table property on open string LFs back
-	    ;; again.
-	    (when swap-open-string-ends
-	      (if (c-get-char-property (1- beg-literal-end)
-				       'syntax-table)
-		  (progn
-		    (c-clear-char-property (1- beg-literal-end)
+  ;; Extend the region (BEG END) to deal with any complicating literals.
+  (let* ((lit-search-beg (if (memq (char-before beg) '(?/ ?*))
+			     (1- beg) beg))
+	 (lit-search-end (if (memq (char-after end) '(?/ ?*))
+			     (1+ end) end))
+	 ;; Note we can't use c-full-pp-to-literal here, since we haven't
+	 ;; yet applied syntax-table properties to ends of lines, etc.
+	 (lit-search-beg-s (c-semi-pp-to-literal lit-search-beg))
+	 (beg-literal-beg (car (cddr lit-search-beg-s)))
+	 (lit-search-end-s (c-semi-pp-to-literal lit-search-end))
+	 (end-literal-beg (car (cddr lit-search-end-s)))
+	 (beg-literal-end (c-end-of-literal lit-search-beg-s lit-search-beg))
+	 (end-literal-end (c-end-of-literal lit-search-end-s lit-search-end))
+	 new-beg new-end search-region)
+
+    ;; Determine any new end of literal resulting from the insertion/deletion.
+    (setq search-region
+	  (if (and (eq beg-literal-beg end-literal-beg)
+		   (eq beg-literal-end end-literal-end))
+	      (if beg-literal-beg
+		  nil
+		(cons beg
+		      (max end
+			   (or beg-literal-end (point-min))
+			   (or end-literal-end (point-min)))))
+	    (cons (or beg-literal-beg beg)
+		  (max end
+		       (or beg-literal-end (point-min))
+		       (or end-literal-end (point-min))))))
+
+    (when search-region
+      ;; If we've just inserted text, mask its syntaxes temporarily so that
+      ;; they won't interfere with the undoing of the properties on the <s
+      ;; and >s.
+      (c-save-buffer-state (syn-tab-settings syn-tab-value
+					     swap-open-string-ends)
+	(unwind-protect
+	    (progn
+	      (when old-len
+		;; Special case: If a \ has just been inserted into a
+		;; string, escaping or unescaping a LF, temporarily swap
+		;; the LF's syntax-table text property with that of the
+		;; former end of the open string.
+		(goto-char end)
+		(when (and (eq (cadr lit-search-beg-s) 'string)
+			   (not (eq beg-literal-end end-literal-end))
+			   (skip-chars-forward "\\\\")
+			   (eq (char-after) ?\n)
+			   (not (zerop (skip-chars-backward "\\\\"))))
+		  (setq swap-open-string-ends t)
+		  (if (c-get-char-property (1- beg-literal-end)
 					   'syntax-table)
-		    (c-put-string-fence (1- end-literal-end)))
-		(c-put-string-fence (1- beg-literal-end))
-		(c-clear-char-property (1- end-literal-end)
-				       'syntax-table)))))
-	  ;; Extend the fontification region, if needed.
-	  (and new-beg
-	       (< new-beg c-new-BEG)
-	       (setq c-new-BEG new-beg))
-	  (and new-end
-	       (> new-end c-new-END)
-	       (setq c-new-END new-end))))))
+		      (progn
+			(c-clear-char-property (1- beg-literal-end)
+					       'syntax-table)
+			(c-put-string-fence (1- end-literal-end)))
+		    (c-put-string-fence (1- beg-literal-end))
+		    (c-clear-char-property (1- end-literal-end)
+					   'syntax-table)))
+
+		;; Save current settings of the 'syntax-table property in
+		;; (BEG END), then splat these with the punctuation value.
+		(goto-char beg)
+		(while (setq syn-tab-value
+			     (c-search-forward-non-nil-char-property
+			      'syntax-table end))
+		  (when (not (c-get-char-property (1- (point)) 'category))
+		    (push (cons (1- (point)) syn-tab-value)
+			  syn-tab-settings)))
+
+		(c-put-char-properties beg end 'syntax-table '(1))
+		;; If an open string's opener has just been neutralized,
+		;; do the same to the terminating LF.
+		(when (and end-literal-end
+			   (eq (char-before end-literal-end) ?\n)
+			   (equal (c-get-char-property
+				   (1- end-literal-end) 'syntax-table)
+				  '(15)))
+		  (push (cons (1- end-literal-end) '(15)) syn-tab-settings)
+		  (c-put-char-property (1- end-literal-end) 'syntax-table
+				       '(1))))
+
+	      (let
+		  ((beg-lit-start (progn (goto-char beg) (c-literal-start)))
+		   beg-limit end-limit <>-pos)
+		;; Locate the earliest < after the barrier before the
+		;; changed region, which isn't already marked as a paren.
+		(goto-char (or beg-lit-start beg))
+		(setq beg-limit (c-determine-limit 5000))
+
+		;; Remove the syntax-table/category properties from each pertinent <...>
+		;; pair.  Firstly, the ones with the < before beg and > after beg....
+		(goto-char (cdr search-region))
+		(while (progn (c-syntactic-skip-backward "^;{}<" beg-limit)
+			      (eq (char-before) ?<))
+		  (c-backward-token-2)
+		  (when (eq (char-after) ?<)
+		    (when (setq <>-pos (c-clear-<-pair-props-if-match-after
+					(car search-region)))
+		      (setq new-end <>-pos))
+		    (setq new-beg (point))))
+
+		;; ...Then the ones with < before end and > after end.
+		(goto-char (car search-region))
+		(setq end-limit (c-determine-+ve-limit 5000))
+		(while (and (c-syntactic-re-search-forward "[;{}>]" end-limit 'end)
+			    (eq (char-before) ?>))
+		  (when (eq (char-before) ?>)
+		    (if (and (looking-at c->-op-cont-regexp)
+			     (not (eq (char-after) ?>)))
+			(goto-char (match-end 0))
+		      (when
+			  (and (setq <>-pos
+				     (c-clear->-pair-props-if-match-before
+				      (cdr search-region)
+				      (1- (point))))
+			       (or (not new-beg)
+				   (< <>-pos new-beg)))
+			(setq new-beg <>-pos))
+		      (when (or (not new-end) (> (point) new-end))
+			(setq new-end (point))))))))
+
+	  (when old-len
+	    (c-clear-char-properties beg end 'syntax-table)
+	    (dolist (elt syn-tab-settings)
+	      (if (cdr elt)
+		  (c-put-char-property (car elt) 'syntax-table (cdr elt)))))
+	  ;; Swap the '(15) syntax-table property on open string LFs back
+	  ;; again.
+	  (when swap-open-string-ends
+	    (if (c-get-char-property (1- beg-literal-end)
+				     'syntax-table)
+		(progn
+		  (c-clear-char-property (1- beg-literal-end)
+					 'syntax-table)
+		  (c-put-string-fence (1- end-literal-end)))
+	      (c-put-string-fence (1- beg-literal-end))
+	      (c-clear-char-property (1- end-literal-end)
+				     'syntax-table)))))
+      ;; Extend the fontification region, if needed.
+      (and new-beg
+	   (< new-beg c-new-BEG)
+	   (setq c-new-BEG new-beg))
+      (and new-end
+	   (> new-end c-new-END)
+	   (setq c-new-END new-end)))))
 
 (defun c-before-change-check-<>-operators (beg end)
   ;; When we're deleting text, unmark certain pairs of "< .... >" which are


> Geza

-- 
Alan Mackenzie (Nuremberg, Germany).





^ permalink raw reply	[flat|nested] 14+ messages in thread

* bug#70435: 30.0.50; cc-mode: <> are sometimes not reconized as parentheses
  2024-04-29 15:53     ` Alan Mackenzie
@ 2024-04-29 17:21       ` Herman, Géza
  2024-05-02  9:30         ` Eli Zaretskii
  0 siblings, 1 reply; 14+ messages in thread
From: Herman, Géza @ 2024-04-29 17:21 UTC (permalink / raw)
  To: Alan Mackenzie; +Cc: Eli Zaretskii, 70435, Herman Géza


Hello Alan,

Alan Mackenzie <acm@muc.de> writes:

> I have a fix, I think.  It is actually a two line fix, removing 
> a test
> from the top of a function, but it involves reindenting the 
> entire rest
> of the function.
>
> Please apply the patch below, recompile cc-engine.el, then load 
> the
> resulting CC Mode into a running Emacs.  Please test it on your 
> real C++
> code, and let me know if the bug is actually fixed.  Thanks!

I can confirm that the patch fixes the issue, I tested it in real 
circumstances.

Thanks for fixing the problem so quickly!

Géza





^ permalink raw reply	[flat|nested] 14+ messages in thread

* bug#70435: 30.0.50; cc-mode: <> are sometimes not reconized as parentheses
  2024-04-29 17:21       ` Herman, Géza
@ 2024-05-02  9:30         ` Eli Zaretskii
  2024-05-02 10:24           ` Alan Mackenzie
  0 siblings, 1 reply; 14+ messages in thread
From: Eli Zaretskii @ 2024-05-02  9:30 UTC (permalink / raw)
  To: Géza Herman; +Cc: acm, 70435

> From: Herman, Géza <geza.herman@gmail.com>
> Cc: Herman Géza <geza.herman@gmail.com>,
>  70435@debbugs.gnu.org, Eli
>  Zaretskii <eliz@gnu.org>
> Date: Mon, 29 Apr 2024 19:21:01 +0200
> 
> 
> Hello Alan,
> 
> Alan Mackenzie <acm@muc.de> writes:
> 
> > I have a fix, I think.  It is actually a two line fix, removing 
> > a test
> > from the top of a function, but it involves reindenting the 
> > entire rest
> > of the function.
> >
> > Please apply the patch below, recompile cc-engine.el, then load 
> > the
> > resulting CC Mode into a running Emacs.  Please test it on your 
> > real C++
> > code, and let me know if the bug is actually fixed.  Thanks!
> 
> I can confirm that the patch fixes the issue, I tested it in real 
> circumstances.
> 
> Thanks for fixing the problem so quickly!

Alan, should this bug be closed now?





^ permalink raw reply	[flat|nested] 14+ messages in thread

* bug#70435: 30.0.50; cc-mode: <> are sometimes not reconized as parentheses
  2024-05-02  9:30         ` Eli Zaretskii
@ 2024-05-02 10:24           ` Alan Mackenzie
  2024-05-02 12:49             ` Herman, Géza
  0 siblings, 1 reply; 14+ messages in thread
From: Alan Mackenzie @ 2024-05-02 10:24 UTC (permalink / raw)
  To: Eli Zaretskii, Géza Herman; +Cc: 70435

Hello, Eli and Géza.

On Thu, May 02, 2024 at 12:30:32 +0300, Eli Zaretskii wrote:
> > From: Herman, Géza <geza.herman@gmail.com>
> > Cc: Herman Géza <geza.herman@gmail.com>,
> >  70435@debbugs.gnu.org, Eli
> >  Zaretskii <eliz@gnu.org>
> > Date: Mon, 29 Apr 2024 19:21:01 +0200


> > Hello Alan,

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

> > > I have a fix, I think.  It is actually a two line fix, removing 
> > > a test
> > > from the top of a function, but it involves reindenting the 
> > > entire rest
> > > of the function.

> > > Please apply the patch below, recompile cc-engine.el, then load 
> > > the
> > > resulting CC Mode into a running Emacs.  Please test it on your 
> > > real C++
> > > code, and let me know if the bug is actually fixed.  Thanks!

> > I can confirm that the patch fixes the issue, I tested it in real 
> > circumstances.

> > Thanks for fixing the problem so quickly!

> Alan, should this bug be closed now?

Apologies for my dithering.  I've been having second thoughts about the
patch in the last few days, and wondering whether I should refine it.

It's all to do with a function c-unmark-<>-around-region, which was run
in before-change-functions for a deletion, and after-change-functions for
an insertion.  The patch I sent to Géza made that function run in before-
and after-c-f both for insertions and deletions.

I've been wondering whether that is strictly necessary, since it will
slow down CC Mode a little.  I'm thinking that in the
insertion/before-c-f case, I might not need the call.

Géza, would you be prepared to do a little more testing if I modified the
patch?

-- 
Alan Mackenzie (Nuremberg, Germany).





^ permalink raw reply	[flat|nested] 14+ messages in thread

* bug#70435: 30.0.50; cc-mode: <> are sometimes not reconized as parentheses
  2024-05-02 10:24           ` Alan Mackenzie
@ 2024-05-02 12:49             ` Herman, Géza
  2024-05-02 13:16               ` bug#70435: 30.0.50; cc-mode: <> are sometimes not recognized " Alan Mackenzie
  0 siblings, 1 reply; 14+ messages in thread
From: Herman, Géza @ 2024-05-02 12:49 UTC (permalink / raw)
  To: Alan Mackenzie; +Cc: Eli Zaretskii, 70435, Géza Herman


Alan Mackenzie <acm@muc.de> writes:

> Géza, would you be prepared to do a little more testing if I 
> modified the
> patch?

Sure, I'm happy to test whether a modified patch still fixes the 
issue.





^ permalink raw reply	[flat|nested] 14+ messages in thread

* bug#70435: 30.0.50; cc-mode: <> are sometimes not recognized as parentheses
  2024-05-02 12:49             ` Herman, Géza
@ 2024-05-02 13:16               ` Alan Mackenzie
  2024-05-02 19:58                 ` Herman, Géza
  0 siblings, 1 reply; 14+ messages in thread
From: Alan Mackenzie @ 2024-05-02 13:16 UTC (permalink / raw)
  To: Herman Géza; +Cc: acm, Eli Zaretskii, 70435

Hello, Géza.

On Thu, May 02, 2024 at 14:49:57 +0200, Herman, Géza wrote:

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

> > Géza, would you be prepared to do a little more testing if I modified
> > the patch?

> Sure, I'm happy to test whether a modified patch still fixes the issue.

Thanks, that's appreciated.

The modified patch is quite a bit shorter than the first one, but it does
a little more.  There was a subtle detail about deleting an unterminated
string, too.

Please remove the first patch from your cc-engine.el, then apply the
patch below.  Byte compile cc-engine.el, then load the resulting CC Mode
into a running Emacs (or restart Emacs).  The test case should (still) be
fixed.

Any testing you can do on real code would also be appreciated.  Please
confirm, again, that the bug is truly fixed, or tell me what still needs
to be fixed.  Thanks!

Here's the patch.  It should apply cleanly to the Emacs master:



diff -r 072940aaeb40 cc-engine.el
--- a/cc-engine.el	Sun Apr 14 07:59:01 2024 +0000
+++ b/cc-engine.el	Thu May 02 13:05:48 2024 +0000
@@ -7172,7 +7172,7 @@
   ;; FIXME!!!  This routine ignores the possibility of macros entirely.
   ;; 2010-01-29.
 
-  (when (> end beg)
+  (when (or old-len (> end beg))
     ;; Extend the region (BEG END) to deal with any complicating literals.
     (let* ((lit-search-beg (if (memq (char-before beg) '(?/ ?*))
 			       (1- beg) beg))
@@ -7246,7 +7246,8 @@
 		  (c-put-char-properties beg end 'syntax-table '(1))
 		  ;; If an open string's opener has just been neutralized,
 		  ;; do the same to the terminating LF.
-		  (when (and end-literal-end
+		  (when (and (> end beg)
+			     end-literal-end
 			     (eq (char-before end-literal-end) ?\n)
 			     (equal (c-get-char-property
 				     (1- end-literal-end) 'syntax-table)


-- 
Alan Mackenzie (Nuremberg, Germany).





^ permalink raw reply	[flat|nested] 14+ messages in thread

* bug#70435: 30.0.50; cc-mode: <> are sometimes not recognized as parentheses
  2024-05-02 13:16               ` bug#70435: 30.0.50; cc-mode: <> are sometimes not recognized " Alan Mackenzie
@ 2024-05-02 19:58                 ` Herman, Géza
  2024-05-05 11:55                   ` Alan Mackenzie
  0 siblings, 1 reply; 14+ messages in thread
From: Herman, Géza @ 2024-05-02 19:58 UTC (permalink / raw)
  To: Alan Mackenzie; +Cc: Eli Zaretskii, 70435, Herman Géza


Hi Alan,

Alan Mackenzie <acm@muc.de> writes:

> Any testing you can do on real code would also be appreciated. 
> Please
> confirm, again, that the bug is truly fixed, or tell me what 
> still needs
> to be fixed.  Thanks!

I checked the new patch, and just like the previous patch, this 
one works correctly as well.  Also, I used cc-mode for an hour for 
editing C++ code, I haven't noticed anything strange so far. I'll 
to keep using it and let you know if I find any bugs.

Thanks,
Géza





^ permalink raw reply	[flat|nested] 14+ messages in thread

* bug#70435: 30.0.50; cc-mode: <> are sometimes not recognized as parentheses
  2024-05-02 19:58                 ` Herman, Géza
@ 2024-05-05 11:55                   ` Alan Mackenzie
  0 siblings, 0 replies; 14+ messages in thread
From: Alan Mackenzie @ 2024-05-05 11:55 UTC (permalink / raw)
  To: Herman, Géza; +Cc: acm, Eli Zaretskii, 70435-done

Hello, Géza.

On Thu, May 02, 2024 at 21:58:33 +0200, Herman, Géza wrote:

> Hi Alan,

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

> > Any testing you can do on real code would also be appreciated. 
> > Please
> > confirm, again, that the bug is truly fixed, or tell me what 
> > still needs
> > to be fixed.  Thanks!

> I checked the new patch, and just like the previous patch, this 
> one works correctly as well.  Also, I used cc-mode for an hour for 
> editing C++ code, I haven't noticed anything strange so far. I'll 
> to keep using it and let you know if I find any bugs.

Many thanks again!  I've now committed the patch to the Emacs master
branch (and a few other places), and am closing the bug with this post.

> Thanks,
> Géza

-- 
Alan Mackenzie (Nuremberg, Germany).





^ permalink raw reply	[flat|nested] 14+ messages in thread

end of thread, other threads:[~2024-05-05 11:55 UTC | newest]

Thread overview: 14+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2024-04-17 10:47 bug#70435: 30.0.50; cc-mode: <> are sometimes not reconized as parentheses Herman, Géza
2024-04-27  8:33 ` Eli Zaretskii
2024-04-27 10:08   ` Alan Mackenzie
2024-04-28 15:44 ` Alan Mackenzie
2024-04-28 16:47   ` Herman, Géza
2024-04-28 20:31     ` Alan Mackenzie
2024-04-29 15:53     ` Alan Mackenzie
2024-04-29 17:21       ` Herman, Géza
2024-05-02  9:30         ` Eli Zaretskii
2024-05-02 10:24           ` Alan Mackenzie
2024-05-02 12:49             ` Herman, Géza
2024-05-02 13:16               ` bug#70435: 30.0.50; cc-mode: <> are sometimes not recognized " Alan Mackenzie
2024-05-02 19:58                 ` Herman, Géza
2024-05-05 11:55                   ` Alan Mackenzie

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