1 ;;;;***************************************************************************
3 ;;;; FILE IDENTIFICATION
5 ;;;; Name: reversi-base.lisp
6 ;;;; Purpose: Basic functions for reversi
7 ;;;; Programer: Kevin M. Rosenberg
8 ;;;; Date Started: 1 Nov 2001
10 ;;;; $Id: utils.lisp,v 1.2 2002/10/25 09:23:39 kevin Exp $
12 ;;;; This file is Copyright (c) 2001-2002 by Kevin M. Rosenberg
14 ;;;; Reversi users are granted the rights to distribute and use this software
15 ;;;; as governed by the terms of the Lisp Lesser GNU Public License
16 ;;;; (http://opensource.franz.com/preamble.html), also known as the LLGPL.
17 ;;;;***************************************************************************
20 (declaim (optimize (safety 1) (debug 3) (speed 3) (compilation-speed 0)))
25 (defmacro aif (test then &optional else)
29 (defmacro awhen (test-form &body body)
33 (defmacro awhile (expr &body body)
34 `(do ((it ,expr ,expr))
38 (defun mappend (fn list)
39 "Append the results of calling fn on each element of list.
40 Like mapcon, but uses append instead of nconc."
41 (apply #'append (mapcar fn list)))
43 (defun random-elt (seq)
44 "Pick a random element out of a sequence."
45 (elt seq (random (length seq))))
47 (defun concat-symbol (&rest args)
48 "Concatenate symbols or strings to form an interned symbol"
49 (intern (format nil "~{~a~}" args)))
51 (defun cross-product (fn xlist ylist)
52 "Return a list of all (fn x y) values."
53 (mappend #'(lambda (y)
54 (mapcar #'(lambda (x) (funcall fn x y))
59 (defmacro until (test &body body)
64 (defmacro while (test &body body)
70 (defun list-to-delimited-string (list &optional (separator #\space))
71 (excl:list-to-delimited-string list separator))
74 (defun list-to-delimited-string (list &optional (separator #\space))
75 (let ((output (when list (format nil "~A" (car list)))))
76 (dolist (obj (rest list))
77 (setq output (concatenate 'string output
78 (format nil "~A" separator)
79 (format nil "~A" obj))))