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+;; proof-fontlock.el Generic font lock expressions
+;; Copyright (C) 1997 LFCS Edinburgh. 
+;; Author: Healfdene Goguen, Thomas Kleymann and Dilip Sequiera
+;; Maintainer: LEGO Team <lego@dcs.ed.ac.uk>
+
+;; $Log$
+;; Revision 1.2  1997/10/13 17:13:50  tms
+;; *** empty log message ***
+;;
+;; Revision 1.1.2.1  1997/10/07 13:34:27  hhg
+;; New structure to share as much as possible between LEGO and Coq.
+;;
+;;
+
+(require 'font-lock)
+
+(defun ids-to-regexp (l)
+  "transforms a non-empty list of identifiers `l' into a regular
+  expression matching any of its elements"
+  (mapconcat (lambda (s) (concat "\\<" s "\\>")) l "\\|"))
+
+;; Generic font-lock
+(defvar proof-id "\\(\\w\\(\\w\\|\\s_\\)*\\)"
+  "A regular expression for parsing identifiers.")
+
+;; For font-lock, we treat ,-separated identifiers as one identifier
+;; and refontify commata using \{proof-unfontify-separator}.
+
+(defun proof-ids (proof-id)
+  "Function to generate a regular expression for separated lists of
+  identifiers."
+  (concat proof-id "\\(\\s *,\\s *" proof-id "\\)*"))
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; font lock faces: declarations, errors, tacticals                 ;;
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(defvar font-lock-declaration-name-face 
+(progn 
+  (cond ((eq (device-class) 'color)
+	 ;notice that device-class does not exist in Emacs 19.30
+
+	 (copy-face 'bold 'font-lock-declaration-name-face)
+
+	 ;; Emacs 19.28 compiles this down to
+	 ;; internal-set-face-1. This is not compatible with XEmacs
+	   (set-face-foreground
+	    'font-lock-declaration-name-face "chocolate"))
+	(t (copy-face 'bold-italic 'font-lock-declaration-name-face)))
+;;  (if running-emacs19
+;;      (setq font-lock-declaration-name-face
+;;	    (face-name 'font-lock-declaration-name-face)))
+  ))
+
+(defvar font-lock-tacticals-name-face
+(if (eq (device-class) 'color)
+    (let ((face (make-face 'font-lock-tacticals-name-face)))
+      (dont-compile
+	(set-face-foreground face
+			     "MediumOrchid3"))
+      face)
+  (copy-face 'bold 'font-lock-tacticals-name-face)))
+
+(defvar font-lock-error-face
+(if (eq (device-class) 'color)
+    (let ((face (make-face 'font-lock-error-face)))
+      (dont-compile
+	(set-face-foreground face
+			     "red"))
+      face)
+  (copy-face 'bold 'font-lock-error-face)))
+
+
+;;
+;; A big hack to unfontify commas in declarations and definitions. All
+;; that can be said for it is that the previous way of doing this was
+;; even more bogus.
+;;
+
+;; Refontify the whole line, 'cos that's what font-lock-after-change
+;; does.
+
+(defun proof-zap-commas-region (start end length)
+  (save-excursion
+    (let 
+	((start (progn (goto-char start) (beginning-of-line) (point)))
+	 (end (progn (goto-char end) (end-of-line) (point))))
+      (goto-char start)
+      (while (search-forward "," end t)
+	(if (memq (get-char-property (- (point) 1) 'face)
+		'(font-lock-declaration-name-face
+		  font-lock-function-name-face))
+	    (font-lock-remove-face (- (point) 1) (point)))))))
+
+(defun proof-zap-commas-buffer () 
+  (proof-zap-commas-region (point-min) (point-max) 0))
+
+(defun proof-unfontify-separator ()
+     (make-local-variable 'after-change-functions)
+     (setq after-change-functions
+	   (append (delq 'proof-zap-commas-region after-change-functions)
+		   '(proof-zap-commas-region))))
+
+
+(provide 'proof-fontlock)