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Common Lisp version by Rainer Joswig
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Emily Bache 2016-06-05 10:10:12 +02:00
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; Hi and welcome to team Gilded Rose. As you know, we are a small inn
; with a prime location in a prominent city ran by a friendly
; innkeeper named Allison. We also buy and sell only the finest goods.
; Unfortunately, our goods are constantly degrading in quality as they
; approach their sell by date. We have a system in place that updates
; our inventory for us. It was developed by a no-nonsense type named
; Leeroy, who has moved on to new adventures. Your task is to add the
; new feature to our system so that we can begin selling a new
; category of items.
; First an introduction to our system:
; All items have a SellIn value which denotes the number of days we have to sell the item
; All items have a Quality value which denotes how valuable the item is
; At the end of each day our system lowers both values for every item
; Pretty simple, right? Well this is where it gets interesting:
; Once the sell by date has passed, Quality degrades twice as fast
; The Quality of an item is never negative
; "Aged Brie" actually increases in Quality the older it gets
; The Quality of an item is never more than 50
; "Sulfuras", being a legendary item, never has to be sold or decreases in Quality
; "Backstage passes", like aged brie, increases in Quality as it's
; SellIn value approaches; Quality increases by 2 when there are 10
; days or less and by 3 when there are 5 days or less but Quality
; drops to 0 after the concert
; We have recently signed a supplier of conjured items. This requires an update to our system:
; "Conjured" items degrade in Quality twice as fast as normal items
; Feel free to make any changes to the UpdateQuality method and add
; any new code as long as everything still works correctly. However,
; do not alter the Item class or Items property as those belong to the
; goblin in the corner who will insta-rage and one-shot you as he
; doesn't believe in shared code ownership (you can make the
; UpdateQuality method and Items property static if you like, we'll
; cover for you).
; Just for clarification, an item can never have its Quality increase
; above 50, however "Sulfuras" is a legendary item and as such its
; Quality is 80 and it never alters.
; https://github.com/emilybache/GildedRose-Refactoring-Kata
; Common Lisp version: Rainer Joswig, joswig@lisp.de, 2016
; Example from the command line:
; sbcl --script gildedrose.lisp 10
;;; ================================================================
;;; Code
(defpackage "GILDED-ROSE"
(:use "CL"))
(in-package "GILDED-ROSE")
;;; Class ITEM
(defclass item ()
((name :initarg :name :type string)
(sell-in :initarg :sell-in :type integer)
(quality :initarg :quality :type integer)))
(defmethod to-string ((i item))
(with-slots (name quality sell-in) i
(format nil "~a, ~a, ~a" name sell-in quality)))
;;; Class GILDED-ROSE
(defclass gilded-rose ()
((items :initarg :items)))
(defmethod update-quality ((gr gilded-rose))
(with-slots (items) gr
(dotimes (i (length items))
(with-slots (name quality sell-in)
(elt items i)
(if (and (not (equalp name "Aged Brie"))
(not (equalp name "Backstage passes to a TAFKAL80ETC concert")))
(if (> quality 0)
(if (not (equalp name "Sulfuras, Hand of Ragnaros"))
(setf quality (- quality 1))))
(when (< quality 50)
(setf quality (+ quality 1))
(when (equalp name "Backstage passes to a TAFKAL80ETC concert")
(if (< sell-in 11)
(if (< quality 50)
(setf quality (+ quality 1))))
(if (< sell-in 6)
(if (< quality 50)
(setf quality (+ quality 1)))))))
(if (not (equalp name "Sulfuras, Hand of Ragnaros"))
(setf sell-in (- sell-in 1)))
(if (< sell-in 0)
(if (not (equalp name "Aged Brie"))
(if (not (equalp name "Backstage passes to a TAFKAL80ETC concert"))
(if (> quality 0)
(if (not (equalp name "Sulfuras, Hand of Ragnaros"))
(setf quality (- quality 1))))
(setf quality (- quality quality)))
(if (< quality 50)
(setf quality (+ quality 1)))))))))
;;; Example
(defun run-gilded-rose ()
(write-line "OMGHAI!")
(let* ((descriptions '(("+5 Dexterity Vest" 10 20)
("Aged Brie" 2 0)
("Elixir of the Mongoose" 5 7)
("Sulfuras, Hand of Ragnaros" 0 80)
("Sulfuras, Hand of Ragnaros" -1 80)
("Backstage passes to a TAFKAL80ETC concert" 15 20)
("Backstage passes to a TAFKAL80ETC concert" 10 49)
("Backstage passes to a TAFKAL80ETC concert" 5 49)
;; this conjured item does not work properly yet
("Conjured Mana Cake" 3 6)))
(items (loop for (name sell-in quality) in descriptions
collect (make-instance 'item
:name name
:sell-in sell-in
:quality quality)))
(app (make-instance 'gilded-rose :items items))
(days 2))
#+sbcl
(if (second sb-ext:*posix-argv*)
(setf days (parse-integer (second sb-ext:*posix-argv*))))
#+lispworks
(if (fourth sys:*line-arguments-list*)
(setf days (parse-integer (fourth sys:*line-arguments-list*))))
(dotimes (i days)
(format t "-------- day ~a --------~%" i)
(format t "name, sell-in, quality~%")
(dolist (item items)
(write-line (to-string item)))
(terpri)
(update-quality app))))
(run-gilded-rose)
;;; ================================================================
;;; EOF