Initial revision

util.lisp

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+;;; -*- Mode: Lisp; Syntax: Common-Lisp; Package: RUNES; -*-
+;;; ---------------------------------------------------------------------------
+;;;     Title: Some common utilities for the Closure browser
+;;;   Created: 1997-12-27
+;;;    Author: Gilbert Baumann <unk6@rz.uni-karlsruhe.de>
+;;;   License: LLGPL (See file COPYING for details).
+;;; ---------------------------------------------------------------------------
+;;;  (c) copyright 1997-1999 by Gilbert Baumann
+
+;;; This code is free software; you can redistribute it and/or modify it
+;;; under the terms of the version 2.1 of the GNU Lesser General Public
+;;; License as published by the Free Software Foundation, as clarified
+;;; by the "Preamble to the Gnu Lesser General Public License" found in
+;;; the file COPYING.
+;;;
+;;; This code 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
+;;; Lesser General Public License for more details.
+;;;
+;;; Version 2.1 of the GNU Lesser General Public License is in the file
+;;; COPYING that was distributed with this file.  If it is not present,
+;;; you can access it from http://www.gnu.org/copyleft/lesser.txt (until
+;;; superseded by a newer version) or write to the Free Software
+;;; Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+
+;; Changes
+;;
+;;  When        Who     What
+;; ----------------------------------------------------------------------------
+;;  1999-08-24  GB      = fixed MULTIPLE-VALUE-OR it now takes any number of
+;;                        subforms
+;;
+
+(in-package :runes)
+
+;;; --------------------------------------------------------------------------------
+;;;  Meta functions
+
+(defun curry (fun &rest args)
+  #'(lambda (&rest more)
+      (apply fun (append args more))))
+
+(defun rcurry (fun &rest args)
+  #'(lambda (&rest more)
+      (apply fun (append more args))))
+
+(defun compose (f g)
+  #'(lambda (&rest args)
+      (funcall f (apply g args))))
+
+;;; --------------------------------------------------------------------------------
+;;;  while and until
+
+(defmacro while (test &body body)
+  `(until (not ,test) ,@body))
+
+(defmacro until (test &body body)
+  `(do () (,test) ,@body))
+
+;; prime numbers
+
+(defun primep (n)
+  "Returns true, iff `n' is prime."
+  (and (> n 2)
+       (do ((i 2 (+ i 1)))
+           ((> (* i i) n) t)
+         (cond ((zerop (mod n i)) (return nil))))))
+
+(defun nearest-greater-prime (n)
+  "Returns the smallest prime number no less than `n'."
+  (cond ((primep n) n)
+        ((nearest-greater-prime (+ n 1)))))