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Matt Decker
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# Scheme port of the Gilded-Rose Kata
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This is a (Gambit) R5RS Scheme port of the *Gilded-Rose-Kata*.
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## Building and Running
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```shell
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gsi texttest-fixture.scm
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```
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## Unit Test
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`assert.scm` is a minimalist implementation of xUnit in Scheme style.
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There are two assertions available, e.g. `(assert=)` and `(assert-string=)`.
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```shell
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gsi gilded-rose-test.scm
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```
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;;;
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;;; Unit test framework for Scheme
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;;; Copyright (c) 2018, Peter Kofler, http://www.code-cop.org/
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;;; BSD licensed.
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;;;
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;;; Non S5RS used functions:
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;;; * (error) from R6RS
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;;;
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;; SchemeUnit from http://c2.com/cgi/wiki?SchemeUnit
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(define (fail msg)
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(error (string-append "AssertionError" ": " msg)))
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(define (check msg condition)
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(if (not condition)
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(fail msg)
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#t))
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(define (assert msg condition)
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(lambda () (check msg condition)))
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;; extensions
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;; private
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(define (make-string-message prefix to-string expected actual)
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(make-message prefix
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(to-string expected)
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(to-string actual)))
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;; private
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(define (make-message prefix expected actual)
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(string-append prefix "expected:<" expected "> but was:<" actual ">"))
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(define (assert-equal to-string eq-op expected actual)
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(assert (make-string-message "" to-string expected actual)
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(eq-op expected actual)))
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(define (assert= expected actual)
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(assert-equal number->string = expected actual))
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(define (assert-string= expected actual)
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(assert-equal values string=? expected actual))
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;; private
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(define (test-case-name name)
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(display name)
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(display " ... "))
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;; private
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(define (test-case-success)
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(display "OK")
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(newline))
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(define (test-case name . assertions)
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(test-case-name name)
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(for-each (lambda (a) (a)) assertions)
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(test-case-success))
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(include "assert.scm")
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(include "gilded-rose.scm")
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(test-case "foo"
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(let ((items (list (make-item "foo" 0 0))))
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(update-quality items)
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(assert-string= "fixme" (item-name (car items)))))
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;;; Class ITEM
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(define-record-type item (make-item name sell-in quality) item? name sell-in quality)
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;; define-record-type ... SRFI-9
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;; creates make-item, item?, item-name, item-sell-in, item-quality, item-name-set!, item-sell-in-set!, item-quality-set!
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(define (item-to-string item)
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(string-append (item-name item)
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", "
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(number->string (item-sell-in item))
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", "
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(number->string (item-quality item))))
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;;; GILDED-ROSE
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(define (update-quality items)
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(for-each
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(lambda (item)
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(if (and (not (string=? (item-name item) "Aged Brie"))
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(not (string=? (item-name item) "Backstage passes to a TAFKAL80ETC concert")))
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(if (> (item-quality item) 0)
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(if (not (string=? (item-name item) "Sulfuras, Hand of Ragnaros"))
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(item-quality-set! item (- (item-quality item) 1))))
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(cond ((< (item-quality item) 50)
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(item-quality-set! item (+ (item-quality item) 1))
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(if (string=? (item-name item) "Backstage passes to a TAFKAL80ETC concert")
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(if (< (item-sell-in item) 11)
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(cond ((< (item-quality item) 50)
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(item-quality-set! item (+ (item-quality item) 1))
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(if (< (item-sell-in item) 6)
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(if (< (item-quality item) 50)
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(item-quality-set! item (+ (item-quality item) 1)))))))))))
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(if (not (string=? (item-name item) "Sulfuras, Hand of Ragnaros"))
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(item-sell-in-set! item (- (item-sell-in item) 1)))
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(if (< (item-sell-in item) 0)
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(if (not (string=? (item-name item) "Aged Brie"))
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(if (not (string=? (item-name item) "Backstage passes to a TAFKAL80ETC concert"))
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(if (> (item-quality item) 0)
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(if (not (string=? (item-name item) "Sulfuras, Hand of Ragnaros"))
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(item-quality-set! item (- (item-quality item) 1))))
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(item-quality-set! item (- (item-quality item) (item-quality item))))
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(if (< (item-quality item) 50)
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(item-quality-set! item (+ (item-quality item) 1))))))
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items))
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(include "gilded-rose.scm")
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(display "OMGHAI!")
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(newline)
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(let ((items (list (make-item "+5 Dexterity Vest" 10 20)
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(make-item "Aged Brie" 2 0)
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(make-item "Elixir of the Mongoose" 5 7)
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(make-item "Sulfuras, Hand of Ragnaros" 0 80)
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(make-item "Sulfuras, Hand of Ragnaros" -1 80)
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(make-item "Backstage passes to a TAFKAL80ETC concert" 15 20)
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(make-item "Backstage passes to a TAFKAL80ETC concert" 10 49)
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(make-item "Backstage passes to a TAFKAL80ETC concert" 5 49)
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;; this conjured item does not work properly yet
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(make-item "Conjured Mana Cake" 3 6)))
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(days 2))
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(define (loop day)
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(cond ((< day days)
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(display (string-append "-------- day " (number->string day) " --------"))
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(newline)
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(display "name, sell-in, quality")
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(newline)
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(for-each
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(lambda (item)
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(display (item-to-string item))
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(newline))
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items)
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(newline)
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(update-quality items)
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(loop (+ day 1)))))
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(loop 0))
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