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hello-world.lisp
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hello-world.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)
(defmd computer ()
(happen (c-in nil) :cell :ephemeral)
(location (c? (case (^happen)
(:leave :away)
(:arrive :at-home)
(t .cache)))) ;; ie, unchanged
(response nil :cell :ephemeral))
(defobserver response(self new-response old-response)
(when new-response
(format t "~&computer: ~a" new-response)))
(defobserver happen()
(when new-value
(format t "~&happen: ~a" new-value)))
(def-cell-test hello-world ()
(let ((dell (make-instance 'computer
:response (c? (bwhen (h (happen self))
(if (eql (^location) :at-home)
(case h
(:knock-knock "who's there?")
(:world "hello, world."))
"<silence>"))))))
(dotimes (n 2)
(setf (happen dell) :knock-knock))
(setf (happen dell) :arrive)
(setf (happen dell) :knock-knock)
(setf (happen dell) :leave)
(values)))
#+(or)
(hello-world)
#| output
happen: KNOCK-KNOCK
computer: <silence>
happen: KNOCK-KNOCK
computer: <silence>
happen: ARRIVE
happen: KNOCK-KNOCK
computer: who's there?
happen: LEAVE
computer: <silence>
|#