--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/elisp/urweb-util.el	Sun Oct 12 10:04:17 2008 -0400
@@ -0,0 +1,123 @@
+;;; urweb-util.el --- Utility functions for urweb-mode
+
+;; Based on sml-mode:
+;; Copyright (C) 1999-2000  Stefan Monnier <monnier@cs.yale.edu>
+;;
+;; Modified for urweb-mode:
+;; Copyright (C) 2008  Adam Chlipala <adamc@hcoop.net>
+;;
+;; This program is free software; you can redistribute it and/or modify
+;; it under the terms of the GNU General Public License as published by
+;; the Free Software Foundation; either version 2 of the License, or
+;; (at your option) any later version.
+;;
+;; This program is distributed in the hope that it will be useful,
+;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;; GNU General Public License for more details.
+;;
+;; You should have received a copy of the GNU General Public License
+;; along with this program; if not, write to the Free Software
+;; Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+
+
+;;; Commentary:
+
+;;; Code:
+
+(require 'cl)				;for `reduce'
+(require 'urweb-compat)
+
+;;
+
+(defun flatten (ls &optional acc)
+  (if (null ls) acc
+    (let ((rest (flatten (cdr ls) acc))
+	  (head (car ls)))
+      (if (listp head)
+	  (flatten head rest)
+	(cons head rest)))))
+
+(defun urweb-preproc-alist (al)
+  "Expand an alist AL where keys can be lists of keys into a normal one."
+  (reduce (lambda (x al)
+	    (let ((k (car x))
+		  (v (cdr x)))
+	      (if (consp k)
+		  (append (mapcar (lambda (y) (cons y v)) k) al)
+		(cons x al))))
+	  al
+	  :initial-value nil
+	  :from-end t))
+
+;;; 
+;;; defmap
+;;; 
+
+(defun custom-create-map (m bs args)
+  (let (inherit dense suppress)
+    (while args
+      (let ((key (first args))
+	    (val (second args)))
+	(cond
+	 ((eq key :dense) (setq dense val))
+	 ((eq key :inherit) (setq inherit val))
+	 ((eq key :group) )
+	 ;;((eq key :suppress) (setq suppress val))
+	 (t (message "Uknown argument %s in defmap" key))))
+      (setq args (cddr args)))
+    (unless (keymapp m)
+      (setq bs (append m bs))
+      (setq m (if dense (make-keymap) (make-sparse-keymap))))
+    (dolist (b bs)
+      (let ((keys (car b))
+	    (binding (cdr b)))
+	(dolist (key (if (consp keys) keys (list keys)))
+	  (cond
+	   ((symbolp key)
+	    (substitute-key-definition key binding m global-map))
+	   ((null binding)
+	    (unless (keymapp (lookup-key m key)) (define-key m key binding)))
+	   ((let ((o (lookup-key m key)))
+	      (or (null o) (numberp o) (eq o 'undefined)))
+	    (define-key m key binding))))))
+    (cond
+     ((keymapp inherit) (set-keymap-parent m inherit))
+     ((consp inherit) (set-keymap-parents m inherit)))
+    m))
+
+(defmacro defmap (m bs doc &rest args)
+  `(defconst ,m
+     (custom-create-map (if (boundp ',m) ,m) ,bs ,(cons 'list args))
+     ,doc))
+
+;; defsyntax ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(defun custom-create-syntax (css args)
+  (let ((st (make-syntax-table (cadr (memq :copy args)))))
+    (dolist (cs css)
+      (let ((char (car cs))
+	    (syntax (cdr cs)))
+	(if (sequencep char)
+	    (mapcar* (lambda (c) (modify-syntax-entry c syntax st)) char)
+	  (modify-syntax-entry char syntax st))))
+    st))
+
+(defmacro defsyntax (st css doc &rest args)
+  `(defconst ,st (custom-create-syntax ,css ,(cons 'list args)) ,doc))
+
+;;;; 
+;;;; Compatibility info
+;;;; 
+
+(defvar urweb-builtin-nested-comments-flag
+  (ignore-errors
+    (not (equal (let ((st (make-syntax-table)))
+		  (modify-syntax-entry ?\* ". 23n" st) st)
+		(let ((st (make-syntax-table)))
+		  (modify-syntax-entry ?\* ". 23" st) st))))
+  "Non-nil means this Emacs understands the `n' in syntax entries.")
+
+(provide 'urweb-util)
+
+;;; urweb-util.el ends here