GNU bug report logs - #40877
[PATCH] cc-mode: add support for Doxygen documentation style

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Michal Nazarewicz <mina86 <at> mina86.com>
Subject: bug#40877: closed (Re: [PATCH] cc-mode: add support for Doxygen
 documentation style)
Date: Fri, 01 May 2020 18:48:02 +0000

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Your bug report

#40877: [PATCH] cc-mode: add support for Doxygen documentation style

which was filed against the emacs package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to 40877 <at> debbugs.gnu.org.

-- 
40877: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=40877
GNU Bug Tracking System
Contact help-debbugs <at> gnu.org with problems

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From: Michał Nazarewicz <mina86 <at> mina86.com>
To: 40877-done <at> debbugs.gnu.org
Subject: Re: [PATCH] cc-mode: add support for Doxygen documentation style
Date: Fri, 1 May 2020 19:46:41 +0100

I’ve taken lack of replies as lack of objections and pushed the change.

-- 
Best regards
ミハウ “𝓶𝓲𝓷𝓪86” ナザレヴイツ
«If at first you don’t succeed, give up skydiving»

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From: Michal Nazarewicz <mina86 <at> mina86.com>
To: bug-gnu-emacs <at> gnu.org
Subject: [PATCH] cc-mode: add support for Doxygen documentation style
Date: Sun, 26 Apr 2020 20:41:48 +0100

* lisp/progmodes/cc-fonts.el (doxygen-font-lock-doc-comments,
  doxygen-font-lock-keywords): New constants defining Doxygen
  comment style support.
* lisp/progmodes/cc-vars.el (c-doc-comment-style): Updated docstring
  to mention now-supported Doxygen mode.
---
 etc/NEWS                   | 16 +++++++-
 lisp/progmodes/cc-fonts.el | 78 ++++++++++++++++++++++++++++++++++++++
 lisp/progmodes/cc-vars.el  |  1 +
 3 files changed, 94 insertions(+), 1 deletion(-)

diff --git a/etc/NEWS b/etc/NEWS
index 025d5c14a7..537abef47b 100644
--- a/etc/NEWS
+++ b/etc/NEWS
@@ -198,7 +198,6 @@ like cell phones, tablets or cameras.
 Previously, assigning a new template to an already defined tag had no
 effect.
 
-
 ** map.el
 
 *** Pcase 'map' pattern added keyword symbols abbreviation.
@@ -288,6 +287,21 @@ prefix on the Subject line in various languages.
 These new navigation commands are bound to 'n' and 'p' in
 'apropos-mode'.
 
+** cc-mode
+
+*** Added support for Doxygen documentation style.
+‘doxygen’ is now valid ‘c-doc-comment-style’ which recognises all
+comment styles supported by Doxygen (namely ‘///’, ‘//!’, ‘/** … */’
+and ‘/*! … */’.  ‘gtkdoc’ remains the default for C and C++ modes; to
+use ‘doxygen’ by default one might evaluate:
+
+    (setq-default c-doc-comment-style
+                  '((java-mode . javadoc)
+                    (pike-mode . autodoc)
+                    (c-mode    . doxygen)
+                    (c++-mode  . doxygen)))
+
+or use it in a custom ‘c-style’.
 
 * New Modes and Packages in Emacs 28.1
 
diff --git a/lisp/progmodes/cc-fonts.el b/lisp/progmodes/cc-fonts.el
index 2cbbc66c14..9ea08a4624 100644
--- a/lisp/progmodes/cc-fonts.el
+++ b/lisp/progmodes/cc-fonts.el
@@ -3016,6 +3016,84 @@ autodoc-font-lock-keywords
 	(c-font-lock-doc-comments "/[*/]!" limit
 	  autodoc-font-lock-doc-comments)))))
 
+;; Doxygen
+
+(defconst doxygen-font-lock-doc-comments
+  ;; TODO: Handle @code, @verbatim, @dot, @f etc. better by not highlighting
+  ;; text inside of those commands.  Something smarter than just regexes may be
+  ;; needed to do that efficiently.
+  `((,(concat
+       ;; Make sure that the special character has not been escaped.  E.g. in
+       ;; ‘\@foo’ only ‘\@’ is a command (similarly for other characters like
+       ;; ‘\\foo’, ‘\<foo’ and ‘\&foo’).  The downside now is that we don’t
+       ;; match command started just after an escaped character, e.g. in
+       ;; ‘\@\foo’ we should match ‘\@’ as well as ‘\foo’ but only the former
+       ;; is matched.
+       "\\(?:^\\|[^\\@]\\)\\("
+         ;; Doxygen commands start with backslash or an at sign.  Note that for
+         ;; brevity in the comments only ‘\’ will be mentioned.
+         "[\\@]\\(?:"
+           ;; Doxygen commands except those starting with ‘f’
+           "[a-eg-z][a-z]*"
+           ;; Doxygen command starting with ‘f’:
+           "\\|f\\(?:"
+             "[][$}]"                         ; \f$ \f} \f[ \f]
+             "\\|{\\(?:[a-zA-Z]+\\*?}{?\\)?"  ; \f{ \f{env} \f{env}{
+             "\\|[a-z]+"                      ; \foo
+           "\\)"
+           "\\|~[a-zA-Z]*"             ; \~  \~language
+           "\\|[$@&~<=>#%\".|\\\\]"    ; single-character escapes
+           "\\|::\\|---?"              ; \:: \-- \---
+         "\\)"
+         ;; HTML tags and entities:
+         "\\|</?\\sw\\(?:\\sw\\|\\s \\|[=\n\r*.:]\\|\"[^\"]*\"\\|'[^']*'\\)*>"
+         "\\|&\\(?:\\sw+\\|#[0-9]+\\|#x[0-9a-fA-F]+\\);"
+       "\\)")
+     1 ,c-doc-markup-face-name prepend nil)
+    ;; Commands inside of strings are not commands so override highlighting with
+    ;; string face.  This also affects HTML attribute values if they are
+    ;; surrounded with double quotes which may or may not be considered a good
+    ;; thing.
+    ("\\(?:^\\|[^\\@]\\)\\(\"[^\"[:cntrl:]]+\"\\)"
+     1 font-lock-string-face prepend nil)
+    ;; HTML comments inside of the Doxygen comments.
+    ("\\(?:^\\|[^\\@]\\)\\(<!--.*?-->\\)"
+     1 font-lock-comment-face prepend nil)
+    ;; Autolinking. Doxygen auto-links anything that is a class name but we have
+    ;; no hope of matching those.  We are, however, able to match functions and
+    ;; members using explicit scoped syntax.  For functions, we can also find
+    ;; them by noticing argument-list.  Note that Doxygen accepts ‘::’ as well
+    ;; as ‘#’ as scope operators.
+    (,(let* ((ref "[\\@]ref\\s-+")
+             (ref-opt (concat "\\(?:" ref "\\)?"))
+             (id "[a-zA-Z_][a-zA-Z_0-9]*")
+             (args "\\(?:()\\|([^()]*)\\)")
+             (scope "\\(?:#\\|::\\)"))
+        (concat
+         "\\(?:^\\|[^\\@/%:]\\)\\(?:"
+                 ref-opt "\\(?1:" scope "?" "\\(?:" id scope "\\)+" "~?" id "\\)"
+           "\\|" ref-opt "\\(?1:" scope     "~?" id "\\)"
+           "\\|" ref-opt "\\(?1:" scope "?" "~?" id "\\)" args
+           "\\|" ref     "\\(?1:" "~?" id "\\)"
+           "\\|" ref-opt "\\(?1:~[A-Z][a-zA-Z0-9_]+\\)"
+         "\\)"))
+     1 font-lock-function-name-face prepend nil)
+    ;; Match URLs and emails.  This has two purposes.  First of all, Doxygen
+    ;; autolinks URLs.  Second of all, ‘@bar’ in ‘foo <at> bar.baz’ has been matched
+    ;; above as a command; try and overwrite it.
+    (,(let* ((host "[A-Za-z0-9]\\(?:[A-Za-z0-9-]\\{0,61\\}[A-Za-z0-9]\\)")
+             (fqdn (concat "\\(?:" host "\\.\\)+" host))
+             (comp "[!-(*--/-=?-~]+")
+             (path (concat "/\\(?:" comp "[.]+" "\\)*" comp)))
+        (concat "\\(?:mailto:\\)?[a-zA-0_.]+@" fqdn
+                "\\|https?://" fqdn "\\(?:" path "\\)?"))
+     0 font-lock-keyword-face prepend nil)))
+
+(defconst doxygen-font-lock-keywords
+  `((,(lambda (limit)
+        (c-font-lock-doc-comments "/\\(?:/[/!]\\|\\*[\\*!]\\)"
+            limit doxygen-font-lock-doc-comments)))))
+
 
 ;; 2006-07-10:  awk-font-lock-keywords has been moved back to cc-awk.el.
 (cc-provide 'cc-fonts)
diff --git a/lisp/progmodes/cc-vars.el b/lisp/progmodes/cc-vars.el
index 3995b21185..b885f6ae1d 100644
--- a/lisp/progmodes/cc-vars.el
+++ b/lisp/progmodes/cc-vars.el
@@ -576,6 +576,7 @@ c-doc-comment-style
  javadoc -- Javadoc style for \"/** ... */\" comments (default in Java mode).
  autodoc -- Pike autodoc style for \"//! ...\" comments (default in Pike mode).
  gtkdoc  -- GtkDoc style for \"/** ... **/\" comments (default in C and C++ modes).
+ doxygen -- Doxygen style.
 
 The value may also be a list of doc comment styles, in which case all
 of them are recognized simultaneously (presumably with markup cues
-- 
2.26.2

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