X-Git-Url: http://git.kpe.io/?p=kmrcl.git;a=blobdiff_plain;f=lists.lisp;fp=lists.lisp;h=ed2148ee347cba703e88b21cd44a1f400df42288;hp=a1fd55cf1498367cec2e52f84520620770eda60f;hb=0f12822c9d49849c26424743b3744d26056be4cc;hpb=c61966ea4ea1f60f5d093c6112543fabed399b97

diff --git a/lists.lisp b/lists.lisp
index a1fd55c..ed2148e 100644
--- a/lists.lisp
+++ b/lists.lisp
@@ -7,7 +7,7 @@
 ;;;; Programmer:    Kevin M. Rosenberg
 ;;;; Date Started:  Apr 2000
 ;;;;
-;;;; $Id: lists.lisp,v 1.5 2003/06/06 21:59:29 kevin Exp $
+;;;; $Id: lists.lisp,v 1.6 2003/06/18 17:12:29 kevin Exp $
 ;;;;
 ;;;; This file, part of KMRCL, is Copyright (c) 2002 by Kevin M. Rosenberg
 ;;;;
@@ -126,3 +126,47 @@
   (let ((results (car list)))
     (dolist (elem (cdr list) results)
       (setq results (append results elem)))))
+
+
+;; alists and plists
+
+(defun alist-elem-p (elem)
+  (and (consp elem) (atom (car elem)) (atom (cdr elem))))
+
+(defun alistp (alist)
+  (when (listp alist)
+    (dolist (elem alist)
+      (unless (alist-elem-p elem)
+        (return-from alistp nil)))
+    t))
+
+(defmacro update-alist (akey value alist &key (test '#'eql) (key '#'identity))
+  "Macro to support below (setf get-alist)"
+  (let ((elem (gensym)))
+    `(let ((,elem (assoc ,akey ,alist :test ,test :key ,key)))
+       (if ,elem
+	   (progn
+	     (setf (cdr ,elem) ,value)
+	     ,alist)
+	(setf ,alist (acons ,akey ,value ,alist))))))
+
+(defun get-alist (key alist &key (test #'eql))
+  (cdr (assoc key alist :test test)))
+
+(defun (setf get-alist) (value key alist &key (test #'eql))
+  (update-alist key value alist :test test)
+  value)
+
+(defun alist-plist (alist)
+  (apply #'append (mapcar #'(lambda (x) (list (car x) (cdr x))) alist)))
+
+(defun plist-alist (plist)
+  (do ((alist '())
+       (pl plist (cddr plist)))
+      ((null pl) alist)
+    (setq alist (acons (car pl) (cadr pl) alist))))
+
+(defun get-plist (key plist &key (test 'eql) (missing nil))
+  (let-if (pos (member key plist :test test))
+	  (cadr pos)
+	  missing))