Browse code
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Ed L authored on 21/10/2015 06:16:22Showing 1 changed files
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+(in-package :cl-user) |
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+ |
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+(defmacro quickloads (&rest r) |
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+ `(progn |
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+ ,@(loop for x in r |
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+ collect `(ql:quickload ,x)))) |
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+ |
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+(quickloads |
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+ :cl-actors |
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+ :cells |
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+ :contextl) |
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+ |
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+(defpackage :math-test |
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+ (:use :cl :cl-actors :cells)) |
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+ |
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+(in-package :math-test) |
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+ |
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+(defmodel service-rating () |
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+ ((rating :cell t :accessor rating :initarg :rating :initform (c-in :normal)) |
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+ (rate :cell t :accessor rate :initform (c? (case (rating self) |
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+ (:normal 0.18) |
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+ (:excellent 0.25) |
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+ (:poor 0.15)))))) |
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+ |
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+(defmodel tip-calc () |
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+ ((cost :cell t :accessor cost :initarg :cost :initform (c-in 0)) |
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+ (rate :cell t :accessor rate :initarg :rate :initform (c-in 0.18)) |
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+ (tip :cell t :accessor tip :initform (c? (* (cost self) |
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+ (rate self)))))) |
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+ |
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+(defmodel item () |
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+ ((kind :cell t :accessor kind :initarg :kind :initform (c-in :food)) |
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+ (cost :cell t :accessor cost :initarg :cost :initform (c-in 0)))) |
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+ |
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+(defmodel bill () |
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+ ((items :accessor items :initarg :items :initform (c-in nil)) |
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+ (cost :accessor cost :initform (c? (apply #'+ |
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+ (loop for item in (items self) |
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+ collect (cost item))))))) |
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+ |
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+(defmodel meal-expense-calculator () |
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+ ((subtotal :accessor subtotal :initarg :subtotal :initform (c-in 0)) |
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+ (tax-rate :accessor tax-rate :initarg :tax-rate :initform (c-in 0.08)) |
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+ (tip :accessor tip :initarg :tip :initform (c-in 0)) |
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+ (total :accessor total :initform (c? (+ (subtotal self) |
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+ (* (tax-rate self) |
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+ (subtotal self)) |
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+ (tip self)))))) |
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+ |
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+(defobserver tip ((self tip-calc)) |
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+ (when old-value-boundp |
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+ (format t "The tip is: ~a~%It changed by: ~a~%" new-value (- new-value |
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+ old-value)))) |
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+ |
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+ |
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+ |
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+(defmacro push-many (place &body items) |
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+ `(progn ,@(loop for item in items |
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+ collect `(push ,item ,place)))) |
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+ |
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+(defparameter s-r (make-instance 'service-rating)) |
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+(defparameter bill (make-instance 'bill)) |
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+(defparameter tc (make-instance 'tip-calc :cost (c? (cost bill)) :rate (c? (rate s-r)))) |
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+(defparameter meal-calc (make-instance 'meal-expense-calculator |
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+ :subtotal (c? (cost bill)) |
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+ :tip (c? (tip tc)))) |
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+ |
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+(push-many (items bill) |
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+ (make-instance 'item :kind :meatloaf :cost 12.99) |
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+ (make-instance 'item :kind :salmon :cost 14.99) |
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+ (make-instance 'item :kind :frenchfries :cost 3.99) |
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+ (make-instance 'item :kind :tomatosoup :cost 3.99) |
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+ (make-instance 'item :kind :burgundy :cost 8.99) |
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+ (make-instance 'item :kind :icedtea :cost 3.99)) |
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+(setf (rating s-r) :excellent) |
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+ |
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+(format t "~{~a~20t~a~%~}------------------------------
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+Subtotal:~20t~a~%Tax:~20t~a~%Tip:~20t~a~%Total:~20t~a~%" |
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+ (loop for item in (items bill) |
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+ append (list (kind item) (cost item))) |
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+ (subtotal meal-calc) |
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+ (* 0.08 (subtotal meal-calc)) |
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+ (tip tc) |
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+ (total meal-calc)) |