(prolog-mode-syntax-table): Add flags to ?/ and ?* entries

to support /* */ style comments.
(prolog-font-lock-keywords): New var.
(prolog-mode): Enable font-locking; set `font-lock-defaults'.

2 files changed, 29 insertions, 8 deletions

diff --git a/lisp/ChangeLog b/lisp/ChangeLog
index 5eedf9c6e1..1049992270 100644
--- a/lisp/ChangeLog
+++ b/lisp/ChangeLog
@@ -1,3 +1,10 @@
+2002-06-01  Thien-Thi Nguyen  <[email protected]>
+
+	* progmodes/prolog.el (prolog-mode-syntax-table): Add flags to
+	?/ and ?* entries to support /* */ style comments.
+	(prolog-font-lock-keywords): New var.
+	(prolog-mode): Enable font-locking; set `font-lock-defaults'.
+
 2002-06-01  Kim F. Storm  <[email protected]>
 
 	* simple.el (choose-completion-string-functions): New special hook.
@@ -33,7 +40,7 @@
 
 	* menu-bar.el (menu-bar-showhide-fringe-menu): Use defvar.
 
-	* subr.el (open-network-stream, open-network-stream-nowait) 
+	* subr.el (open-network-stream, open-network-stream-nowait)
 	(open-network-stream-server, process-kill-without-query):
 	Moved from simple.el.
 
@@ -174,8 +181,8 @@
 
 2002-05-25  Miles Bader  <[email protected]>
 
-	* menu-bar.el (menu-bar-showhide-fringe-menu-customize-left) 
-	(menu-bar-showhide-fringe-menu-customize-right) 
+	* menu-bar.el (menu-bar-showhide-fringe-menu-customize-left)
+	(menu-bar-showhide-fringe-menu-customize-right)
 	(menu-bar-showhide-fringe-menu-customize-disable):
 	Use proper calling convention for `customize-set-value'.
 	Require `fringe' before setting variable.
@@ -2493,7 +2500,7 @@
 	prefix from scroll commands.  Ignore end-of-buffer errors from
 	other windows.
 	(scroll-all-check-to-scroll): Remove `fkey-' prefix from scroll
-	commands. 
+	commands.
 	(scroll-all-beginning-of-buffer-all, scroll-all-end-of-buffer-all):
 	New functions.
 
diff --git a/lisp/progmodes/prolog.el b/lisp/progmodes/prolog.el
index 593d3a8de3..6cb571b73e 100644
--- a/lisp/progmodes/prolog.el
+++ b/lisp/progmodes/prolog.el
@@ -26,7 +26,7 @@
 
 ;; This package provides a major mode for editing Prolog.  It knows
 ;; about Prolog syntax and comments, and can send regions to an inferior
-;; Prolog interpreter process.
+;; Prolog interpreter process.  Font locking is tuned towards GNU Prolog.
 
 ;;; Code:
 
@@ -38,7 +38,7 @@
   "Major mode for editing and running Prolog under Emacs"
   :group 'languages)
 
-  
+
 (defcustom prolog-program-name "prolog"
   "*Program name for invoking an inferior Prolog with `run-prolog'."
   :type 'string
@@ -65,13 +65,23 @@ nil means send actual operating system end of file."
   :type 'integer
   :group 'prolog)
 
+(defvar prolog-font-lock-keywords
+  '(("\\(#[<=]=>\\|:-\\)\\|\\(#=\\)\\|\\(#[#<>\\/][=\\/]*\\|!\\)"
+     0 font-lock-keyword-face)
+    ("\\<\\(is\\|write\\|nl\\|read_\\sw+\\)\\>"
+     1 font-lock-keyword-face)
+    ("^\\(\\sw+\\)\\s-*\\((\\(.+\\))\\)*"
+     (1 font-lock-function-name-face)
+     (3 font-lock-variable-name-face)))
+  "Font-lock keywords for Prolog mode.")
+
 (if prolog-mode-syntax-table
     ()
   (let ((table (make-syntax-table)))
     (modify-syntax-entry ?_ "w" table)
     (modify-syntax-entry ?\\ "\\" table)
-    (modify-syntax-entry ?/ "." table)
-    (modify-syntax-entry ?* "." table)
+    (modify-syntax-entry ?/ ". 14" table)
+    (modify-syntax-entry ?* ". 23" table)
     (modify-syntax-entry ?+ "." table)
     (modify-syntax-entry ?- "." table)
     (modify-syntax-entry ?= "." table)
@@ -129,6 +139,10 @@ if that value is non-nil."
   (setq major-mode 'prolog-mode)
   (setq mode-name "Prolog")
   (prolog-mode-variables)
+  ;; font lock
+  (setq font-lock-defaults '(prolog-font-lock-keywords
+                             nil nil nil
+                             beginning-of-line))
   (run-hooks 'prolog-mode-hook))
 
 (defun prolog-indent-line (&optional whole-exp)