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+;;; elib-dll-debug -- A slow implementation of elib-dll for debugging.
+;;; elib-dll-debug.el,v 1.2 1992/04/07 20:49:13 berliner Exp
+;;; Copyright (C) 1991,1992  Per Cederqvist
+;;;
+;;; 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.
+
+
+;;; This is a plug-in replacement for elib-dll.el.  It is dreadfully
+;;; slow, but it facilitates debugging.  Don't trust the comments in
+;;; this file too much.
+(provide 'elib-dll)
+
+;;;
+;;; A doubly linked list consists of one cons cell which holds the tag
+;;; 'DL-LIST in the car cell and the list in the cdr 
+;;; cell. The doubly linked list is implemented as a normal list. You
+;;; should use elib-dll.el and not this package in debugged code. This
+;;; package is not written for speed...
+;;;
+
+;;; ================================================================
+;;;      Internal functions for use in the doubly linked list package
+
+(defun dll-get-dummy-node (dll)
+
+  ;; Return the dummy node.   INTERNAL USE ONLY.
+  dll)
+
+(defun dll-list-nodes (dll)
+
+  ;; Return a list of all nodes in DLL.   INTERNAL USE ONLY.
+
+  (cdr dll))
+
+(defun dll-set-from-node-list (dll list)
+
+  ;; Set the contents of DLL to the nodes in LIST.
+  ;; INTERNAL USE ONLY.
+
+  (setcdr dll list))
+
+(defun dll-get-node-before (dll node)
+  ;; Return the node in DLL that points to NODE. Use
+  ;; (dll-get-node-before some-list nil) to get the last node.
+  ;; INTERNAL USE ONLY.
+  (while (and dll (not (eq (cdr dll) node)))
+    (setq dll (cdr dll)))
+  (if (not dll)
+      (error "Node not on list"))
+  dll)
+
+(defmacro dll-insert-after (node element)
+  (let ((node-v (make-symbol "node"))
+	(element-v (make-symbol "element")))
+    (` (let (((, node-v) (, node))
+	     ((, element-v) (, element)))
+	 (setcdr (, node-v) (cons (, element-v) (cdr (, node-v))))))))
+
+;;; ===================================================================
+;;;       The public functions which operate on doubly linked lists.
+
+(defmacro dll-element (dll node)
+
+  "Get the element of a NODE in a doubly linked list DLL.
+Args: DLL NODE."
+
+  (` (car (, node))))
+
+
+(defun dll-create ()
+  "Create an empty doubly linked list."
+  (cons 'DL-LIST nil))
+
+
+(defun dll-p (object)
+  "Return t if OBJECT is a doubly linked list, otherwise return nil."
+  (eq (car-safe object) 'DL-LIST))
+
+
+(defun dll-enter-first (dll element)
+  "Add an element first on a doubly linked list.
+Args: DLL ELEMENT."
+  (setcdr dll (cons element (cdr dll))))
+
+
+(defun dll-enter-last (dll element)
+  "Add an element last on a doubly linked list.
+Args: DLL ELEMENT."
+  (dll-insert-after (dll-get-node-before dll nil) element))
+
+
+(defun dll-enter-after (dll node element)
+  "In the doubly linked list DLL, insert a node containing ELEMENT after NODE.
+Args: DLL NODE ELEMENT."
+
+  (dll-get-node-before dll node)
+  (dll-insert-after node element))
+
+
+(defun dll-enter-before (dll node element)
+  "In the doubly linked list DLL, insert a node containing ELEMENT before NODE.
+Args: DLL NODE ELEMENT."
+
+  (dll-insert-after (dll-get-node-before dll node) element))
+
+
+
+(defun dll-next (dll node)
+  "Return the node after NODE, or nil if NODE is the last node.
+Args: DLL NODE."
+
+  (dll-get-node-before dll node)
+  (cdr node))
+
+
+(defun dll-previous (dll node)
+  "Return the node before NODE, or nil if NODE is the first node.
+Args: DLL NODE."
+
+  (dll-get-node-before dll node))
+
+
+(defun dll-delete (dll node)
+
+  "Delete NODE from the doubly linked list DLL.
+Args: DLL NODE. Return the element of node."
+
+  ;; This is a no-op when applied to the dummy node. This will return
+  ;; nil if applied to the dummy node since it always contains nil.
+
+  (setcdr (dll-get-node-before dll node) (cdr node)))
+
+
+(defun dll-delete-first (dll)
+
+  "Delete the first NODE from the doubly linked list DLL.
+Return the element. Args: DLL. Returns nil if the DLL was empty."
+
+  ;; Relies on the fact that dll-delete does nothing and
+  ;; returns nil if given the dummy node.
+
+  (setcdr dll (cdr (cdr dll))))
+
+
+(defun dll-delete-last (dll)
+
+  "Delete the last NODE from the doubly linked list DLL.
+Return the element. Args: DLL. Returns nil if the DLL was empty."
+
+  ;; Relies on the fact that dll-delete does nothing and
+  ;; returns nil if given the dummy node.
+
+  (setcdr dll (dll-get-node-before dll nil) nil))
+
+
+(defun dll-first (dll)
+
+  "Return the first element on the doubly linked list DLL.
+Return nil if the list is empty. The element is not removed."
+
+  (car (cdr dll)))
+
+
+
+
+(defun dll-last (dll)
+
+  "Return the last element on the doubly linked list DLL.
+Return nil if the list is empty. The element is not removed."
+
+  (car (dll-get-node-before dll nil)))
+
+
+
+(defun dll-nth (dll n)
+
+  "Return the Nth node from the doubly linked list DLL.
+ Args: DLL N
+N counts from zero. If DLL is not that long, nil is returned.
+If N is negative, return the -(N+1)th last element.
+Thus, (dll-nth dll 0) returns the first node,
+and (dll-nth dll -1) returns the last node."
+
+  ;; Branch 0 ("follow left pointer") is used when n is negative.
+  ;; Branch 1 ("follow right pointer") is used otherwise.
+
+  (if (>= n 0)
+      (nthcdr n (cdr dll))
+    (unwind-protect
+	(progn (setcdr dll (nreverse (cdr dll)))
+	       (nthcdr (- n) dll))
+      (setcdr dll (nreverse (cdr dll))))))
+
+(defun dll-empty (dll)
+
+  "Return t if the doubly linked list DLL is empty, nil otherwise"
+
+  (not (cdr dll)))
+
+(defun dll-length (dll)
+
+  "Returns the number of elements in the doubly linked list DLL."
+
+  (length (cdr dll)))
+
+
+
+(defun dll-copy (dll &optional element-copy-fnc)
+
+  "Return a copy of the doubly linked list DLL.
+If optional second argument ELEMENT-COPY-FNC is non-nil it should be
+a function that takes one argument, an element, and returns a copy of it.
+If ELEMENT-COPY-FNC is not given the elements are not copied."
+
+  (if element-copy-fnc
+      (cons 'DL-LIST (mapcar element-copy-fnc (cdr dll)))
+    (copy-sequence dll)))
+
+
+(defun dll-all (dll)
+
+  "Return all elements on the double linked list DLL as an ordinary list."
+
+  (cdr dll))
+
+
+(defun dll-clear (dll)
+
+  "Clear the doubly linked list DLL, i.e. make it completely empty."
+
+  (setcdr dll nil))
+
+
+(defun dll-map (map-function dll)
+
+  "Apply MAP-FUNCTION to all elements in the doubly linked list DLL.
+The function is applied to the first element first."
+
+  (mapcar map-function (cdr dll)))
+
+
+(defun dll-map-reverse (map-function dll)
+
+  "Apply MAP-FUNCTION to all elements in the doubly linked list DLL.
+The function is applied to the last element first."
+
+  (unwind-protect
+      (setcdr dll (nreverse (cdr dll)))
+    (mapcar map-function (cdr dll))
+    (setcdr dll (nreverse (cdr dll)))))
+
+
+(defun dll-create-from-list (list)
+
+  "Given an elisp LIST create a doubly linked list with the same elements."
+
+  (cons 'DL-LIST list))
+
+
+
+(defun dll-sort (dll predicate)
+
+  "Sort the doubly linked list DLL, stably, comparing elements using PREDICATE.
+Returns the sorted list. DLL is modified by side effects.
+PREDICATE is called with two elements of DLL, and should return T
+if the first element is \"less\" than the second."
+
+  (setcdr dll (sort (cdr dll) predicate))
+  dll)
+
+
+(defun dll-filter (dll predicate)
+
+  "Remove all elements in the doubly linked list DLL for which PREDICATE
+return nil."
+
+  (let* ((prev dll)
+	 (node (cdr dll)))
+
+    (while node
+      (cond
+       ((funcall predicate (car node))
+	(setq prev node))
+       (t
+	(setcdr prev (cdr node))))
+      (setq node (cdr node)))))