utils.lisp

;;; Copyright (c) 2007 Zachary Beane, All Rights Reserved
;;;
;;; Redistribution and use in source and binary forms, with or without
;;; modification, are permitted provided that the following conditions
;;; are met:
;;;
;;;   * Redistributions of source code must retain the above copyright
;;;     notice, this list of conditions and the following disclaimer.
;;;
;;;   * Redistributions in binary form must reproduce the above
;;;     copyright notice, this list of conditions and the following
;;;     disclaimer in the documentation and/or other materials
;;;     provided with the distribution.
;;;
;;; THIS SOFTWARE IS PROVIDED BY THE AUTHOR 'AS IS' AND ANY EXPRESSED
;;; OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
;;; WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
;;; ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
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;;; DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
;;; GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
;;; INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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;;; $Id: utils.lisp,v 1.3 2007/09/20 17:41:21 xach Exp $

(in-package #:vecto)

(defun clamp-range (low value high)
  (min (max value low) high))

(defun float-octet (float)
  "Convert a float in the range 0.0 - 1.0 to an octet."
  (values (round (* float 255.0))))

(defun octet-float (octet)
  "Convert an octet to a float."
  (/ octet 255.0))

;; hyperdoc definitions
(defvar *hyperdoc-base-uri* "http://www.xach.com/lisp/vecto/")

(let ((exported-symbols-alist
       (loop for symbol being the external-symbols of :vecto
          collect (cons symbol
                        (concatenate 'string
                                     "#"
                                     (string-downcase symbol))))))
  (defun hyperdoc-lookup (symbol type)
    (declare (ignore type))
    (cdr (assoc symbol
                exported-symbols-alist
                :test #'eq))))