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47 lines
2.4 KiB
Scheme
47 lines
2.4 KiB
Scheme
;;; 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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(if (< (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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