Fix fontification of first item in CC Mode macro without parentheses

* lisp/progmodes/cc-engine.el (c-find-decl-prefix-search): Handle the new
matching possibility (of a #define construct) in the new
c-decl-prefix-or-start-re.
(c-find-decl-spots): Allow the initial search for an in-macro starting point
settle on the # of #define, to facilitate the regexp matching in
c-find-decl-prefix-search.

* lisp/progmodes/cc-langs.el (c-anchored-hash-define-no-parens): New lang
const.
(c-literal-start-regexp): Correct what was always supposed to be a "generic
string" regexp element.
(c-decl-prefix-or-start-re): Enhance also to match "#define <identifier>".
(c-dposr-cpp-macro-depth): New lang variable and lang constant.

Author: Alan Mackenzie

lisp/progmodes/cc-engine.el

@@ -5692,7 +5692,10 @@ comment at the start of cc-engine.el for more info."
 	       (setq cfd-re-match cfd-limit)
 	       nil)
 	      ((c-got-face-at
-		(if (setq cfd-re-match (match-end 1))
+		(if (setq cfd-re-match
+			  (or (match-end 1)
+			      (and c-dposr-cpp-macro-depth
+				   (match-end (1+ c-dposr-cpp-macro-depth)))))
 		    ;; Matched the end of a token preceding a decl spot.
 		    (progn
 		      (goto-char cfd-re-match)
@@ -5703,15 +5706,19 @@ comment at the start of cc-engine.el for more info."
 		c-literal-faces)
 	       ;; Pseudo match inside a comment or string literal.  Skip out
 	       ;; of comments and string literals.
-	       (while (progn
-			(unless
-			    (and (match-end 1)
-				 (c-got-face-at (1- (point)) c-literal-faces)
-				 (not (c-got-face-at (point) c-literal-faces)))
-			  (goto-char (c-next-single-property-change
-				      (point) 'face nil cfd-limit)))
-			(and (< (point) cfd-limit)
-			     (c-got-face-at (point) c-literal-faces))))
+	       (while
+		   (progn
+		     (unless
+			 (and
+			  (or (match-end 1)
+			      (and c-dposr-cpp-macro-depth
+				   (match-end (1+ c-dposr-cpp-macro-depth))))
+			  (c-got-face-at (1- (point)) c-literal-faces)
+			  (not (c-got-face-at (point) c-literal-faces)))
+		       (goto-char (c-next-single-property-change
+				   (point) 'face nil cfd-limit)))
+		     (and (< (point) cfd-limit)
+			  (c-got-face-at (point) c-literal-faces))))
 	       t)		      ; Continue the loop over pseudo matches.
 	      ((and c-opt-identifier-concat-key
 		    (match-string 1)
@@ -5863,7 +5870,7 @@ comment at the start of cc-engine.el for more info."
     ;; before the point, and do the first `c-decl-prefix-or-start-re'
     ;; search unless we're at bob.
 
-    (let (start-in-literal start-in-macro syntactic-pos)
+    (let (start-in-literal start-in-macro syntactic-pos hash-define-pos)
       ;; Must back up a bit since we look for the end of the previous
       ;; statement or declaration, which is earlier than the first
       ;; returned match.
@@ -6018,7 +6025,21 @@ comment at the start of cc-engine.el for more info."
 	  ;; The only syntactic ws in macros are comments.
 	  (c-backward-comments)
 	  (or (bobp) (backward-char))
-	  (c-beginning-of-current-token))
+	  (c-beginning-of-current-token)
+	  ;; If we're in a macro without argument parentheses, we could have
+	  ;; now ended up at the macro's identifier.  We need to be at #define
+	  ;; for `c-find-decl-prefix-search' to find the first token of the
+	  ;; macro's expansion.
+	  (when (and (c-on-identifier)
+		     (setq hash-define-pos
+			   (save-excursion
+			     (and
+			      (zerop (c-backward-token-2 2)) ; over define, #
+			      (save-excursion
+				(beginning-of-line)
+				(looking-at c-opt-cpp-macro-define-id))
+			      (point)))))
+	    (goto-char hash-define-pos)))
 
 	 (start-in-literal
 	  ;; If we're in a comment it can only be the closest

lisp/progmodes/cc-langs.el

@@ -979,6 +979,14 @@ definition, or nil if the language doesn't have any."
 (c-lang-defvar c-opt-cpp-macro-define-id
   (c-lang-const c-opt-cpp-macro-define-id))
 
+(c-lang-defconst c-anchored-hash-define-no-parens
+  ;; Regexp matching everything up to the end of a cpp define which has no
+  ;; argument parentheses.  Or nil in languages which don't have them.
+  t (if (c-lang-const c-opt-cpp-macro-define)
+	(concat (c-lang-const c-anchored-cpp-prefix)
+		(c-lang-const c-opt-cpp-macro-define)
+		"[ \t]+\\(\\sw\\|_\\)+\\([^(a-zA-Z0-9_]\\|$\\)")))
+
 (c-lang-defconst c-cpp-expr-directives
   "List of cpp directives (without the prefix) that are followed by an
 expression."
@@ -1614,7 +1622,7 @@ starter."
   t (concat (c-lang-const c-comment-start-regexp)
 	    "\\|"
 	    (if (memq 'gen-string-delim c-emacs-features)
-		"\"|"
+		"\"\\|\\s|"
 	      "\"")))
 (c-lang-defvar c-literal-start-regexp (c-lang-const c-literal-start-regexp))
 
@@ -3183,24 +3191,40 @@ constructs."
   ;; token that might precede such a construct, e.g. ';', '}' or '{'.
   ;; It's built from `c-decl-prefix-re'.
   ;;
-  ;; If the first submatch did not match, the match of the whole
-  ;; regexp is taken to be at the first token in the declaration.
-  ;; `c-decl-start-re' is not checked in this case.
+  ;; If the first submatch did not match, we have either a #define construct
+  ;; without parentheses or the match of the whole regexp is taken to be at
+  ;; the first token in the declaration.  `c-decl-start-re' is not checked in
+  ;; these cases.
   ;;
   ;; Design note: The reason the same regexp is used to match both
   ;; tokens that precede declarations and start them is to avoid an
   ;; extra regexp search from the previous declaration spot in
   ;; `c-find-decl-spots'.  Users of `c-find-decl-spots' also count on
-  ;; that it finds all declaration/cast/label starts in approximately
+  ;; it finding all declaration/cast/label starts in approximately
   ;; linear order, so we can't do the searches in two separate passes.
-  t (if (c-lang-const c-decl-start-kwds)
-	(concat (c-lang-const c-decl-prefix-re)
-		"\\|"
-		(c-make-keywords-re t (c-lang-const c-decl-start-kwds)))
-      (c-lang-const c-decl-prefix-re)))
+  t (cond
+     ((and (c-lang-const c-decl-start-kwds)
+	   (c-lang-const c-anchored-hash-define-no-parens))
+      (concat (c-lang-const c-decl-prefix-re)
+	      "\\|" (c-lang-const c-anchored-hash-define-no-parens)
+	      "\\|" (c-make-keywords-re t (c-lang-const c-decl-start-kwds))))
+     ((c-lang-const c-decl-start-kwds)
+      (concat (c-lang-const c-decl-prefix-re)
+	      "\\|" (c-make-keywords-re t (c-lang-const c-decl-start-kwds))))
+     ((c-lang-const c-anchored-hash-define-no-parens)
+      (concat (c-lang-const c-decl-prefix-re)
+	      "\\|" (c-lang-const c-anchored-hash-define-no-parens)))
+     (t (c-lang-const c-decl-prefix-re))))
 (c-lang-defvar c-decl-prefix-or-start-re
   (c-lang-const c-decl-prefix-or-start-re))
 
+(c-lang-defconst c-dposr-cpp-macro-depth
+  ;; The match number of `c-anchored-hash-define-no-parens''s first match
+  ;; within `c-decl-prefix-or-start-re', or nil if there is no such component.
+  t (if (c-lang-const c-anchored-hash-define-no-parens)
+	(1+ (regexp-opt-depth (c-lang-const c-decl-prefix-re)))))
+(c-lang-defvar c-dposr-cpp-macro-depth (c-lang-const c-dposr-cpp-macro-depth))
+
 (c-lang-defconst c-cast-parens
   ;; List containing the paren characters that can open a cast, or nil in
   ;; languages without casts.