C preprocessor directives in asm-mode and ld-script-mode

[Masatake YAMATO <jet@gyve.org>]

Hi,

In order to fontificate C preprocessor directives well in asm-mode and
ld-script-mode, I'd like to make c-font-lock-keywords-1 in GNU Emacs
21.2 revive as `cpp-font-lock-keywords'.

`cpp-font-lock-keywords' may be handy to implement a new mode in 
which C preprocessor directives is used. Mode for Imakefile is one of 
such modes.

Masatake YAMATO

2005-11-12  Masatake YAMATO  <jet@gyve.org>

	* font-lock.el (cpp-font-lock-keywords): Font lock keywords for
	C preprocessor forward ported from GNU Emacs 21.2.

	* progmodes/asm-mode.el (asm-font-lock-keywords): Use 
	`cpp-font-lock-keywords'.

	* progmodes/ld-script.el (ld-script-font-lock-keywords): Ditto.

Index: lisp/progmodes/ld-script.el
===================================================================
RCS file: /cvsroot/emacs/emacs/lisp/progmodes/ld-script.el,v
retrieving revision 1.8
diff -u -r1.8 ld-script.el
--- lisp/progmodes/ld-script.el	1 Nov 2005 15:45:32 -0000	1.8
+++ lisp/progmodes/ld-script.el	12 Nov 2005 04:26:03 -0000
@@ -114,18 +114,19 @@
   "Builtin functions of GNU ld script.")
 
 (defvar ld-script-font-lock-keywords
-  `((,(regexp-opt ld-script-keywords 'words)
-     1 font-lock-keyword-face)
-    (,(regexp-opt ld-script-builtins 'words)
-     1 font-lock-builtin-face)
-    ("/DISCARD/" . font-lock-warning-face)
-    ("##\\|#[^#\n]+$"  . font-lock-preprocessor-face)
-    ("\\W\\(\\.\\)\\W" 1 ld-script-location-counter-face)
-    )
+  (append
+   `((,(regexp-opt ld-script-keywords 'words)
+      1 font-lock-keyword-face)
+     (,(regexp-opt ld-script-builtins 'words)
+      1 font-lock-builtin-face)
+     ("/DISCARD/" . font-lock-warning-face)
+     ("\\W\\(\\.\\)\\W" 1 ld-script-location-counter-face)
+     )
+   cpp-font-lock-keywords)
   "Default font-lock-keywords for `ld-script-mode'.")
 
 ;;;###autoload
-(add-to-list 'auto-mode-alist '("\\.ld[s]?\\(\\.in\\)?$" . ld-script-mode))
+(add-to-list 'auto-mode-alist '("\\.lds?\\>" . ld-script-mode))
 
 ;;;###autoload
 (define-derived-mode ld-script-mode nil "LD-Script"
Index: lisp/progmodes/asm-mode.el
===================================================================
RCS file: /cvsroot/emacs/emacs/lisp/progmodes/asm-mode.el,v
retrieving revision 1.33
diff -u -r1.33 asm-mode.el
--- lisp/progmodes/asm-mode.el	1 Aug 2005 08:37:49 -0000	1.33
+++ lisp/progmodes/asm-mode.el	12 Nov 2005 04:26:03 -0000
@@ -82,19 +82,21 @@
   "Keymap for Asm mode.")
 
 (defconst asm-font-lock-keywords
- '(("^\\(\\(\\sw\\|\\s_\\)+\\)\\>:?[ \t]*\\(\\sw+\\(\\.\\sw+\\)*\\)?"
-    (1 font-lock-function-name-face) (3 font-lock-keyword-face nil t))
-   ;; label started from ".".
-   ("^\\(\\.\\(\\sw\\|\\s_\\)+\\)\\>:"
-    1 font-lock-function-name-face)
-   ("^\\((\\sw+)\\)?\\s +\\(\\(\\.?\\sw\\|\\s_\\)+\\(\\.\\sw+\\)*\\)"
-    2 font-lock-keyword-face)
-   ;; directive started from ".".
-   ("^\\(\\.\\(\\sw\\|\\s_\\)+\\)\\>[^:]?"
-    1 font-lock-keyword-face)
-   ;; %register
-   ("%\\sw+" . font-lock-variable-name-face))
- "Additional expressions to highlight in Assembler mode.")
+  (append 
+   '(("^\\(\\(\\sw\\|\\s_\\)+\\)\\>:?[ \t]*\\(\\sw+\\(\\.\\sw+\\)*\\)?"
+      (1 font-lock-function-name-face) (3 font-lock-keyword-face nil t))
+     ;; label started from ".".
+     ("^\\(\\.\\(\\sw\\|\\s_\\)+\\)\\>:"
+      1 font-lock-function-name-face)
+     ("^\\((\\sw+)\\)?\\s +\\(\\(\\.?\\sw\\|\\s_\\)+\\(\\.\\sw+\\)*\\)"
+      2 font-lock-keyword-face)
+     ;; directive started from ".".
+     ("^\\(\\.\\(\\sw\\|\\s_\\)+\\)\\>[^:]?"
+      1 font-lock-keyword-face)
+     ;; %register
+     ("%\\sw+" . font-lock-variable-name-face))
+   cpp-font-lock-keywords)
+  "Additional expressions to highlight in Assembler mode.")
 
 ;;;###autoload
 (defun asm-mode ()
Index: lisp/font-lock.el
===================================================================
RCS file: /cvsroot/emacs/emacs/lisp/font-lock.el,v
retrieving revision 1.282
diff -u -r1.282 font-lock.el
--- lisp/font-lock.el	5 Nov 2005 07:29:45 -0000	1.282
+++ lisp/font-lock.el	12 Nov 2005 04:26:03 -0000
@@ -1956,6 +1956,58 @@
 	      (goto-char (or (scan-sexps (point) 1) (point-max))))
 	    (goto-char (match-end 2)))
 	(error t)))))
+
+;; C preprocessor(cpp) is used outside of C, C++ and Objective-C source file.
+;; e.g. assembler code and GNU linker script in Linux kernel.
+;; `cpp-font-lock-keywords' is handy for modes for the files.
+(defconst cpp-font-lock-keywords
+  (let* ((cpp-directives
+	  (eval-when-compile
+	    (regexp-opt
+	     '("define"  "elif" "else" "endif" "error" "file" "if" "ifdef"
+	       "ifndef" "include" "line" "pragma" "undef"))))
+	 (cpp-directives-depth
+	  (regexp-opt-depth cpp-directives)))
+    (list
+     ;;
+     ;; Fontify error directives.
+     '("^#[ \t]*error[ \t]+\\(.+\\)" 1 font-lock-warning-face prepend)
+     ;;
+     ;; Fontify filenames in #include <...> preprocessor directives as strings.
+     '("^#[ \t]*\\(?:import\\|include\\)[ \t]*\\(<[^>\"\n]*>?\\)"
+       1 font-lock-string-face prepend)
+     ;;
+     ;; Fontify function macro names.
+     '("^#[ \t]*define[ \t]+\\([[:alpha:]_][[:alnum:]_$]*\\)(" 
+       (1 font-lock-function-name-face prepend)
+       ;;
+       ;; Macro arguments.
+       ((lambda (limit)
+	  (re-search-forward
+	   "\\(?:\\([[:alpha:]_][[:alnum:]_]*\\)[,]?\\)" 
+	   (or (save-excursion (re-search-forward ")" limit t)) 
+	       limit)
+	   t)) 
+	nil nil (1 font-lock-variable-name-face prepend)))
+     ;;
+     ;; Fontify symbol names in #elif or #if ... defined preprocessor directives.
+     '("^#[ \t]*\\(?:elif\\|if\\)\\>"
+       ("\\<\\(defined\\)\\>[ \t]*(?\\([[:alpha:]_][[:alnum:]_]*\\)?" nil nil
+	(1 font-lock-builtin-face prepend) (2 font-lock-variable-name-face prepend t)))
+     ;;
+     ;; Fontify otherwise as symbol names, and the preprocessor directive names.
+     (list
+      (concat "^\\(#[ \t]*\\(?:" cpp-directives
+	      "\\)\\)\\>[ \t!]*\\([[:alpha:]_][[:alnum:]_]*\\)?")
+      '(1 font-lock-preprocessor-face prepend)
+      (list (+ 2 cpp-directives-depth)
+	    'font-lock-variable-name-face nil t))))
+    "Font lock keyords for C preprocessor directives.
+`c-mode', `c++-mode' and `objc-mode' have their own 
+Font lock keyords for C preprocessor directives. This definition is for the
+other modes in which C preprocessor directives are used. e.g. `asm-mode' and
+`ld-script-mode'.")
+
 \f
 ;; Lisp.