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hw.lisp
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hw.lisp
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;; -*- mode: Lisp; Syntax: Common-Lisp; Package: cells; -*-
;;;
;;;
;;; Copyright (c) 1995,2003 by Kenneth William Tilton.
;;;
;;; Permission is hereby granted, free of charge, to any person obtaining a copy
;;; of this software and associated documentation files (the "Software"), to deal
;;; in the Software without restriction, including without limitation the rights
;;; to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
;;; copies of the Software, and to permit persons to whom the Software is furnished
;;; to do so, subject to the following conditions:
;;;
;;; The above copyright notice and this permission notice shall be included in
;;; all copies or substantial portions of the Software.
;;;
;;; THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
;;; IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
;;; FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
;;; AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
;;; LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
;;; FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
;;; IN THE SOFTWARE.
(in-package :cells)
(defmodel computer ()
((hear :cell :ephemeral :accessor hear :initform (c-in nil))
(salutation :initarg :salutation :accessor salutation :initform "hello")
(response :initform nil :initarg :response
:unchanged-if ‘string= :accessor response)))
(def-c-output response ()
(when new-value
(format t "~&hear: ~a~%respond: ~a" (hear self) new-value)))
(defun hello-world ()
(cell-reset)
(let ((system (make-instance 'computer
:response (c? (let ((r (case (hear self)
(:knock-knock "who's there?")
(:world (concatenate 'string
(salutation self)
", "
(string (hear self))))
((nil) "<silence>"))))
(if (string= r .cache)
(format nil "i said, \"~a\"" r)
r))))))
(format t "~&to-be initialization complete")
(setf (hear system) :knock-knock)
(setf (hear system) :knock-knock)
(setf (hear system) :world)
(setf (salutation system) "hiya")
(values)))
#+(or)
(hello-world)
#| output
hear: nil
respond: <silence>
hear: knock-knock
respond: who's there?
hear: knock-knock
respond: i said, "who's there?"
hear: world
respond: hello, world
|#