* "enum class" supports for cc-mode
@ 2014-10-27 18:36 Daniel Colascione
2014-10-29 16:49 ` Alan Mackenzie
0 siblings, 1 reply; 7+ messages in thread
From: Daniel Colascione @ 2014-10-27 18:36 UTC (permalink / raw)
To: Emacs developers, Alan Mackenzie
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Here's a small patch that teaches cc-mode about C++11 "enum class" syntax.
See http://msdn.microsoft.com/en-us/library/2dzy4k6e.aspx
Alan, can you take a look?
=== modified file 'lisp/progmodes/cc-engine.el'
--- lisp/progmodes/cc-engine.el 2014-10-18 10:02:59 +0000
+++ lisp/progmodes/cc-engine.el 2014-10-27 18:00:51 +0000
@@ -8460,28 +8460,41 @@
(cond
((c-syntactic-re-search-forward c-decl-block-key open-brace t t t)
(goto-char (setq kwd-start (match-beginning 0)))
- (or
-
- ;; Found a keyword that can't be a type?
- (match-beginning 1)
-
- ;; Can be a type too, in which case it's the return type of a
- ;; function (under the assumption that no declaration level
- ;; block construct starts with a type).
- (not (c-forward-type))
-
- ;; Jumped over a type, but it could be a declaration keyword
- ;; followed by the declared identifier that we've jumped over
- ;; instead (e.g. in "class Foo {"). If it indeed is a type
- ;; then we should be at the declarator now, so check for a
- ;; valid declarator start.
- ;;
- ;; Note: This doesn't cope with the case when a declared
- ;; identifier is followed by e.g. '(' in a language where '('
- ;; also might be part of a declarator expression. Currently
- ;; there's no such language.
- (not (or (looking-at c-symbol-start)
- (looking-at c-type-decl-prefix-key)))))
+ (and
+ ;; Exclude cases where we matched what would ordinarily
+ ;; be a block declaration keyword, except where it's not
+ ;; legal because it's part of a "compound keyword" like
+ ;; "enum class". Of course, if c-after-brace-list-key
+ ;; is nil, we can skip the test.
+ (or (null c-after-brace-list-key)
+ (save-match-data
+ (save-excursion
+ (not
+ (and
+ (looking-at c-after-brace-list-key)
+ (= (c-backward-token-2 1 t) 0)
+ (looking-at c-brace-list-key))))))
+ (or
+ ;; Found a keyword that can't be a type?
+ (match-beginning 1)
+
+ ;; Can be a type too, in which case it's the return type of a
+ ;; function (under the assumption that no declaration level
+ ;; block construct starts with a type).
+ (not (c-forward-type))
+
+ ;; Jumped over a type, but it could be a declaration keyword
+ ;; followed by the declared identifier that we've jumped over
+ ;; instead (e.g. in "class Foo {"). If it indeed is a type
+ ;; then we should be at the declarator now, so check for a
+ ;; valid declarator start.
+ ;;
+ ;; Note: This doesn't cope with the case when a declared
+ ;; identifier is followed by e.g. '(' in a language where '('
+ ;; also might be part of a declarator expression. Currently
+ ;; there's no such language.
+ (not (or (looking-at c-symbol-start)
+ (looking-at c-type-decl-prefix-key))))))
;; In Pike a list of modifiers may be followed by a brace
;; to make them apply to many identifiers. Note that the
@@ -8586,9 +8599,35 @@
(not (looking-at "=")))))
b-pos)))
+(defun c-backward-colon-prefixed-type ()
+ ;; We're after what might be a type prefixed with a colon. Try
+ ;; moving backward over this type and the colon. On success, return
+ ;; t and leave point before colon, on falure, leave point unchanged.
+ ;; Will clobber match data.
+ (let ((colon-pos nil))
+ (save-excursion
+ (while
+ (and (eql (c-backward-token-2) 0)
+ (or (not (looking-at "\\s)"))
+ (c-go-up-list-backward))
+ (cond
+ ((eql (char-after) ?:)
+ (setq colon-pos (point))
+ nil)
+ ((eql (char-after) ?\()
+ t)
+ ((looking-at c-symbol-key)
+ t)
+ (t nil)))))
+ (when colon-pos
+ (goto-char colon-pos)
+ t)))
+
(defun c-backward-over-enum-header ()
;; We're at a "{". Move back to the enum-like keyword that starts this
;; declaration and return t, otherwise don't move and return nil.
+ (when c-recognize-post-brace-list-type-p
+ (c-backward-colon-prefixed-type))
(let ((here (point))
up-sexp-pos before-identifier)
(while
@@ -8596,21 +8635,22 @@
(eq (c-backward-token-2) 0)
(or (not (looking-at "\\s)"))
(c-go-up-list-backward))
- (cond
- ((and (looking-at c-symbol-key) (c-on-identifier)
- (not before-identifier))
- (setq before-identifier t))
- ((and before-identifier
- (or (eq (char-after) ?,)
- (looking-at c-postfix-decl-spec-key)))
- (setq before-identifier nil)
- t)
- ((looking-at c-brace-list-key) nil)
- ((and c-recognize-<>-arglists
- (eq (char-after) ?<)
- (looking-at "\\s("))
- t)
- (t nil))))
+ (cond
+ ((and (looking-at c-symbol-key) (c-on-identifier)
+ (not before-identifier))
+ (setq before-identifier t))
+ ((and before-identifier
+ (or (eql (char-after) ?,)
+ (looking-at c-postfix-decl-spec-key)))
+ (setq before-identifier nil)
+ t)
+ ((looking-at c-after-brace-list-key) t)
+ ((looking-at c-brace-list-key) nil)
+ ((and c-recognize-<>-arglists
+ (eq (char-after) ?<)
+ (looking-at "\\s("))
+ t)
+ (t nil))))
(or (looking-at c-brace-list-key)
(progn (goto-char here) nil))))
=== modified file 'lisp/progmodes/cc-langs.el'
--- lisp/progmodes/cc-langs.el 2014-10-12 20:09:15 +0000
+++ lisp/progmodes/cc-langs.el 2014-10-27 17:34:41 +0000
@@ -1805,8 +1805,31 @@
;; Regexp matching the start of declarations where the following
;; block is a brace list.
t (c-make-keywords-re t (c-lang-const c-brace-list-decl-kwds)))
+
(c-lang-defvar c-brace-list-key (c-lang-const c-brace-list-key))
+(c-lang-defconst c-after-brace-list-decl-kwds
+ "Keywords that might follow keywords in `c-brace-list-decl-kwds'
+and precede the opening brace."
+ t nil
+ c++ '("class" "struct"))
+
+(c-lang-defconst c-after-brace-list-key
+ ;; Regexp matching keywords that can fall between a brace-list
+ ;; keyword and the associated brace list.
+ t (c-make-keywords-re t (c-lang-const c-after-brace-list-decl-kwds)))
+
+(c-lang-defvar c-after-brace-list-key (c-lang-const c-after-brace-list-key))
+
+(c-lang-defconst c-recognize-post-brace-list-type-p
+ ;; Recognize a colon and then a type after an enum, e.g.,
+ ;; enum foo : int { A, B, C };
+ t nil
+ c++ t)
+
+(c-lang-defvar c-recognize-post-brace-list-type-p
+ (c-lang-const c-recognize-post-brace-list-type-p))
+
(c-lang-defconst c-other-block-decl-kwds
"Keywords where the following block (if any) contains another
declaration level that should not be considered a class. For every
@@ -2000,6 +2023,7 @@
;; prefixes.
t (delete-duplicates (append (c-lang-const c-class-decl-kwds)
(c-lang-const c-brace-list-decl-kwds)
+ (c-lang-const c-after-brace-list-decl-kwds)
(c-lang-const c-other-block-decl-kwds)
(c-lang-const c-typedef-decl-kwds)
(c-lang-const c-typeless-decl-kwds)
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^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: "enum class" supports for cc-mode
2014-10-27 18:36 "enum class" supports for cc-mode Daniel Colascione
@ 2014-10-29 16:49 ` Alan Mackenzie
2014-10-29 17:02 ` Daniel Colascione
0 siblings, 1 reply; 7+ messages in thread
From: Alan Mackenzie @ 2014-10-29 16:49 UTC (permalink / raw)
To: Daniel Colascione; +Cc: Emacs developers
Hi, Daniel.
On Mon, Oct 27, 2014 at 06:36:09PM +0000, Daniel Colascione wrote:
> Here's a small patch that teaches cc-mode about C++11 "enum class" syntax.
> See http://msdn.microsoft.com/en-us/library/2dzy4k6e.aspx
> Alan, can you take a look?
Thanks for this, it looks good. I'll definitely install it (with proper
attribution).
Just one or two little details:
(i) You've used `eql' rather than `eq' for comparing things in a few
places. Is there any reason for this?
(ii) c-after-brace-list-key will be "\\<\\>" (not nil) for non-C++
languages, I think. It's definition in cc-langs.el needs tweaking a
bit to make it nil.
(iii) There's a question as to whether the backward searching in
c-backward-colon-prefixed-type should have an optional search limit.
But the existing c-backward-over-enum-header doesn't, so that's
something new to think about.
Now, I'll go and try actually merging and running it.
> === modified file 'lisp/progmodes/cc-engine.el'
> --- lisp/progmodes/cc-engine.el 2014-10-18 10:02:59 +0000
> +++ lisp/progmodes/cc-engine.el 2014-10-27 18:00:51 +0000
> @@ -8460,28 +8460,41 @@
> (cond
> ((c-syntactic-re-search-forward c-decl-block-key open-brace t t t)
> (goto-char (setq kwd-start (match-beginning 0)))
> - (or
> -
> - ;; Found a keyword that can't be a type?
> - (match-beginning 1)
> -
> - ;; Can be a type too, in which case it's the return type of a
> - ;; function (under the assumption that no declaration level
> - ;; block construct starts with a type).
> - (not (c-forward-type))
> -
> - ;; Jumped over a type, but it could be a declaration keyword
> - ;; followed by the declared identifier that we've jumped over
> - ;; instead (e.g. in "class Foo {"). If it indeed is a type
> - ;; then we should be at the declarator now, so check for a
> - ;; valid declarator start.
> - ;;
> - ;; Note: This doesn't cope with the case when a declared
> - ;; identifier is followed by e.g. '(' in a language where '('
> - ;; also might be part of a declarator expression. Currently
> - ;; there's no such language.
> - (not (or (looking-at c-symbol-start)
> - (looking-at c-type-decl-prefix-key)))))
> + (and
> + ;; Exclude cases where we matched what would ordinarily
> + ;; be a block declaration keyword, except where it's not
> + ;; legal because it's part of a "compound keyword" like
> + ;; "enum class". Of course, if c-after-brace-list-key
> + ;; is nil, we can skip the test.
> + (or (null c-after-brace-list-key)
> + (save-match-data
> + (save-excursion
> + (not
> + (and
> + (looking-at c-after-brace-list-key)
> + (= (c-backward-token-2 1 t) 0)
> + (looking-at c-brace-list-key))))))
> + (or
> + ;; Found a keyword that can't be a type?
> + (match-beginning 1)
> +
> + ;; Can be a type too, in which case it's the return type of a
> + ;; function (under the assumption that no declaration level
> + ;; block construct starts with a type).
> + (not (c-forward-type))
> +
> + ;; Jumped over a type, but it could be a declaration keyword
> + ;; followed by the declared identifier that we've jumped over
> + ;; instead (e.g. in "class Foo {"). If it indeed is a type
> + ;; then we should be at the declarator now, so check for a
> + ;; valid declarator start.
> + ;;
> + ;; Note: This doesn't cope with the case when a declared
> + ;; identifier is followed by e.g. '(' in a language where '('
> + ;; also might be part of a declarator expression. Currently
> + ;; there's no such language.
> + (not (or (looking-at c-symbol-start)
> + (looking-at c-type-decl-prefix-key))))))
>
> ;; In Pike a list of modifiers may be followed by a brace
> ;; to make them apply to many identifiers. Note that the
> @@ -8586,9 +8599,35 @@
> (not (looking-at "=")))))
> b-pos)))
>
> +(defun c-backward-colon-prefixed-type ()
> + ;; We're after what might be a type prefixed with a colon. Try
> + ;; moving backward over this type and the colon. On success, return
> + ;; t and leave point before colon, on falure, leave point unchanged.
> + ;; Will clobber match data.
> + (let ((colon-pos nil))
> + (save-excursion
> + (while
> + (and (eql (c-backward-token-2) 0)
> + (or (not (looking-at "\\s)"))
> + (c-go-up-list-backward))
> + (cond
> + ((eql (char-after) ?:)
> + (setq colon-pos (point))
> + nil)
> + ((eql (char-after) ?\()
> + t)
> + ((looking-at c-symbol-key)
> + t)
> + (t nil)))))
> + (when colon-pos
> + (goto-char colon-pos)
> + t)))
> +
> (defun c-backward-over-enum-header ()
> ;; We're at a "{". Move back to the enum-like keyword that starts this
> ;; declaration and return t, otherwise don't move and return nil.
> + (when c-recognize-post-brace-list-type-p
> + (c-backward-colon-prefixed-type))
> (let ((here (point))
> up-sexp-pos before-identifier)
> (while
> @@ -8596,21 +8635,22 @@
> (eq (c-backward-token-2) 0)
> (or (not (looking-at "\\s)"))
> (c-go-up-list-backward))
> - (cond
> - ((and (looking-at c-symbol-key) (c-on-identifier)
> - (not before-identifier))
> - (setq before-identifier t))
> - ((and before-identifier
> - (or (eq (char-after) ?,)
> - (looking-at c-postfix-decl-spec-key)))
> - (setq before-identifier nil)
> - t)
> - ((looking-at c-brace-list-key) nil)
> - ((and c-recognize-<>-arglists
> - (eq (char-after) ?<)
> - (looking-at "\\s("))
> - t)
> - (t nil))))
> + (cond
> + ((and (looking-at c-symbol-key) (c-on-identifier)
> + (not before-identifier))
> + (setq before-identifier t))
> + ((and before-identifier
> + (or (eql (char-after) ?,)
> + (looking-at c-postfix-decl-spec-key)))
> + (setq before-identifier nil)
> + t)
> + ((looking-at c-after-brace-list-key) t)
> + ((looking-at c-brace-list-key) nil)
> + ((and c-recognize-<>-arglists
> + (eq (char-after) ?<)
> + (looking-at "\\s("))
> + t)
> + (t nil))))
> (or (looking-at c-brace-list-key)
> (progn (goto-char here) nil))))
>
>
> === modified file 'lisp/progmodes/cc-langs.el'
> --- lisp/progmodes/cc-langs.el 2014-10-12 20:09:15 +0000
> +++ lisp/progmodes/cc-langs.el 2014-10-27 17:34:41 +0000
> @@ -1805,8 +1805,31 @@
> ;; Regexp matching the start of declarations where the following
> ;; block is a brace list.
> t (c-make-keywords-re t (c-lang-const c-brace-list-decl-kwds)))
> +
> (c-lang-defvar c-brace-list-key (c-lang-const c-brace-list-key))
>
> +(c-lang-defconst c-after-brace-list-decl-kwds
> + "Keywords that might follow keywords in `c-brace-list-decl-kwds'
> +and precede the opening brace."
> + t nil
> + c++ '("class" "struct"))
> +
> +(c-lang-defconst c-after-brace-list-key
> + ;; Regexp matching keywords that can fall between a brace-list
> + ;; keyword and the associated brace list.
> + t (c-make-keywords-re t (c-lang-const c-after-brace-list-decl-kwds)))
> +
> +(c-lang-defvar c-after-brace-list-key (c-lang-const c-after-brace-list-key))
> +
> +(c-lang-defconst c-recognize-post-brace-list-type-p
> + ;; Recognize a colon and then a type after an enum, e.g.,
> + ;; enum foo : int { A, B, C };
> + t nil
> + c++ t)
> +
> +(c-lang-defvar c-recognize-post-brace-list-type-p
> + (c-lang-const c-recognize-post-brace-list-type-p))
> +
> (c-lang-defconst c-other-block-decl-kwds
> "Keywords where the following block (if any) contains another
> declaration level that should not be considered a class. For every
> @@ -2000,6 +2023,7 @@
> ;; prefixes.
> t (delete-duplicates (append (c-lang-const c-class-decl-kwds)
> (c-lang-const c-brace-list-decl-kwds)
> + (c-lang-const c-after-brace-list-decl-kwds)
> (c-lang-const c-other-block-decl-kwds)
> (c-lang-const c-typedef-decl-kwds)
> (c-lang-const c-typeless-decl-kwds)
--
Alan Mackenzie (Nuremberg, Germany).
^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: "enum class" supports for cc-mode
2014-10-29 16:49 ` Alan Mackenzie
@ 2014-10-29 17:02 ` Daniel Colascione
2014-10-30 16:21 ` Alan Mackenzie
0 siblings, 1 reply; 7+ messages in thread
From: Daniel Colascione @ 2014-10-29 17:02 UTC (permalink / raw)
To: Alan Mackenzie; +Cc: Emacs developers
[-- Attachment #1: Type: text/plain, Size: 1323 bytes --]
On 10/29/2014 04:49 PM, Alan Mackenzie wrote:
> Hi, Daniel.
>
> On Mon, Oct 27, 2014 at 06:36:09PM +0000, Daniel Colascione wrote:
>> Here's a small patch that teaches cc-mode about C++11 "enum class" syntax.
>> See http://msdn.microsoft.com/en-us/library/2dzy4k6e.aspx
>
>> Alan, can you take a look?
>
> Thanks for this, it looks good. I'll definitely install it (with proper
> attribution).
Thanks.
> Just one or two little details:
> (i) You've used `eql' rather than `eq' for comparing things in a few
> places. Is there any reason for this?
eql is a good habit for numbers; = and eq would work just as well in
these contexts though in Emacs.
> (ii) c-after-brace-list-key will be "\\<\\>" (not nil) for non-C++
> languages, I think. It's definition in cc-langs.el needs tweaking a
> bit to make it nil.
Good point. Would you mind making this change?
> (iii) There's a question as to whether the backward searching in
> c-backward-colon-prefixed-type should have an optional search limit.
> But the existing c-backward-over-enum-header doesn't, so that's
> something new to think about.
I figure that the search will stop soon enough when we come across a
token that can't be part of the enum header. Placing a generically
correct bound on it seemed hard.
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^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: "enum class" supports for cc-mode
2014-10-29 17:02 ` Daniel Colascione
@ 2014-10-30 16:21 ` Alan Mackenzie
2014-10-30 18:56 ` Daniel Colascione
2014-10-31 20:35 ` Glenn Morris
0 siblings, 2 replies; 7+ messages in thread
From: Alan Mackenzie @ 2014-10-30 16:21 UTC (permalink / raw)
To: Daniel Colascione; +Cc: Emacs developers
Hello, Daniel.
On Wed, Oct 29, 2014 at 05:02:28PM +0000, Daniel Colascione wrote:
> On 10/29/2014 04:49 PM, Alan Mackenzie wrote:
> > On Mon, Oct 27, 2014 at 06:36:09PM +0000, Daniel Colascione wrote:
> >> Here's a small patch that teaches cc-mode about C++11 "enum class" syntax.
> >> See http://msdn.microsoft.com/en-us/library/2dzy4k6e.aspx
I've installed the patch.
Just as a matter of interest, I had to toughen up
c-backward-colon-prefixed-type, since it had supriously captured
class Foo {
public:
enum {
, mistaking the colon after "public" for a colon inside an enum
declaration.
Also, in general, please prefer tabs to spaces for indentation in CC
Mode. In cc-langs.el, there's no need for a blank line between
(c-lang-defconst foo ..) and (c-lang-defvar foo ...).
> Thanks.
> > Just one or two little details:
> > (i) You've used `eql' rather than `eq' for comparing things in a few
> > places. Is there any reason for this?
> eql is a good habit for numbers; = and eq would work just as well in
> these contexts though in Emacs.
OK. I've left eql in.
> > (ii) c-after-brace-list-key will be "\\<\\>" (not nil) for non-C++
> > languages, I think. It's definition in cc-langs.el needs tweaking a
> > bit to make it nil.
> Good point. Would you mind making this change?
My mistake - the "\\<\\>" value was needed somewhere else. I changed the
test against nil to an `equal' test against "\\<\\>". It seems to work.
> > (iii) There's a question as to whether the backward searching in
> > c-backward-colon-prefixed-type should have an optional search limit.
> > But the existing c-backward-over-enum-header doesn't, so that's
> > something new to think about.
> I figure that the search will stop soon enough when we come across a
> token that can't be part of the enum header. Placing a generically
> correct bound on it seemed hard.
It is, isn't it. What will cost is if there's an unbalanced close
paren/brace/bracket. That might cause a lot of scanning from BOB. I'll
have another look at this, sometime.
--
Alan Mackenzie (Nuremberg, Germany).
^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: "enum class" supports for cc-mode
2014-10-30 16:21 ` Alan Mackenzie
@ 2014-10-30 18:56 ` Daniel Colascione
2014-10-31 20:35 ` Glenn Morris
1 sibling, 0 replies; 7+ messages in thread
From: Daniel Colascione @ 2014-10-30 18:56 UTC (permalink / raw)
To: Alan Mackenzie; +Cc: Emacs developers
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On 10/30/2014 04:21 PM, Alan Mackenzie wrote:
> Hello, Daniel.
>
> On Wed, Oct 29, 2014 at 05:02:28PM +0000, Daniel Colascione wrote:
>> On 10/29/2014 04:49 PM, Alan Mackenzie wrote:
>
>>> On Mon, Oct 27, 2014 at 06:36:09PM +0000, Daniel Colascione wrote:
>>>> Here's a small patch that teaches cc-mode about C++11 "enum class" syntax.
>>>> See http://msdn.microsoft.com/en-us/library/2dzy4k6e.aspx
>
> I've installed the patch.
Thanks. Are you planning on merging into Emacs soon?
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^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: "enum class" supports for cc-mode
2014-10-30 16:21 ` Alan Mackenzie
2014-10-30 18:56 ` Daniel Colascione
@ 2014-10-31 20:35 ` Glenn Morris
2014-11-01 10:39 ` Alan Mackenzie
1 sibling, 1 reply; 7+ messages in thread
From: Glenn Morris @ 2014-10-31 20:35 UTC (permalink / raw)
To: Alan Mackenzie; +Cc: Daniel Colascione, Emacs developers
Alan Mackenzie wrote:
>> > On Mon, Oct 27, 2014 at 06:36:09PM +0000, Daniel Colascione wrote:
>> >> Here's a small patch that teaches cc-mode about C++11 "enum class"
>> >> syntax
[...]
> I've installed the patch.
Please make ChangeLog entries in the name of the patch author, not the
committer. (Ideally, use commit --author as well, which vc-dir can do
automatically based on the ChangeLog.)
^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: "enum class" supports for cc-mode
2014-10-31 20:35 ` Glenn Morris
@ 2014-11-01 10:39 ` Alan Mackenzie
0 siblings, 0 replies; 7+ messages in thread
From: Alan Mackenzie @ 2014-11-01 10:39 UTC (permalink / raw)
To: Glenn Morris; +Cc: Daniel Colascione, Emacs developers
Hello, Glenn.
On Fri, Oct 31, 2014 at 04:35:50PM -0400, Glenn Morris wrote:
> Alan Mackenzie wrote:
> >> > On Mon, Oct 27, 2014 at 06:36:09PM +0000, Daniel Colascione wrote:
> >> >> Here's a small patch that teaches cc-mode about C++11 "enum class"
> >> >> syntax
> [...]
> > I've installed the patch.
> Please make ChangeLog entries in the name of the patch author, not the
> committer. (Ideally, use commit --author as well, which vc-dir can do
> automatically based on the ChangeLog.)
Sorry. I forgot. I've just corrected the ChangeLog.
--
Alan Mackenzie (Nuremberg, Germany).
^ permalink raw reply [flat|nested] 7+ messages in thread
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2014-10-27 18:36 "enum class" supports for cc-mode Daniel Colascione
2014-10-29 16:49 ` Alan Mackenzie
2014-10-29 17:02 ` Daniel Colascione
2014-10-30 16:21 ` Alan Mackenzie
2014-10-30 18:56 ` Daniel Colascione
2014-10-31 20:35 ` Glenn Morris
2014-11-01 10:39 ` Alan Mackenzie
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