utils.lisp

   1 ;;; Copyright (c) 2007 Zachary Beane, All Rights Reserved
   2 ;;;
   3 ;;; Redistribution and use in source and binary forms, with or without
   4 ;;; modification, are permitted provided that the following conditions
   5 ;;; are met:
   6 ;;;
   7 ;;;   * Redistributions of source code must retain the above copyright
   8 ;;;     notice, this list of conditions and the following disclaimer.
   9 ;;;
  10 ;;;   * Redistributions in binary form must reproduce the above
  11 ;;;     copyright notice, this list of conditions and the following
  12 ;;;     disclaimer in the documentation and/or other materials
  13 ;;;     provided with the distribution.
  14 ;;;
  15 ;;; THIS SOFTWARE IS PROVIDED BY THE AUTHOR 'AS IS' AND ANY EXPRESSED
  16 ;;; OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  17 ;;; WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  18 ;;; ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
  19 ;;; DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  20 ;;; DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
  21 ;;; GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  22 ;;; INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
  23 ;;; WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  24 ;;; NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  25 ;;; SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  26 ;;;
  27 ;;; $Id: utils.lisp,v 1.3 2007/09/20 17:41:21 xach Exp $
  28
  29 (in-package #:vecto)
  30
  31 (defun clamp-range (low value high)
  32   (min (max value low) high))
  33
  34 (defun float-octet (float)
  35   "Convert a float in the range 0.0 - 1.0 to an octet."
  36   (values (round (* float 255.0))))
  37
  38 (defun octet-float (octet)
  39   "Convert an octet to a float."
  40   (/ octet 255.0))
  41
  42 ;; hyperdoc definitions
  43 (defvar *hyperdoc-base-uri* "http://www.xach.com/lisp/vecto/")
  44
  45 (let ((exported-symbols-alist
  46        (loop for symbol being the external-symbols of :vecto
  47           collect (cons symbol
  48                         (concatenate 'string
  49                                      "#"
  50                                      (string-downcase symbol))))))
  51   (defun hyperdoc-lookup (symbol type)
  52     (declare (ignore type))
  53     (cdr (assoc symbol
  54                 exported-symbols-alist
  55                 :test #'eq))))