75 lines
2.1 KiB
Scheme
75 lines
2.1 KiB
Scheme
;; Predicates
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(define title
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(lambda (recipe)
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(car (recipe))))
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(define ingredients
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(lambda (recipe)
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(car (cdr recipe))))
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(define steps
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(lambda (recipe)
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(car (cdr (cdr recipe)))))
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(define ingredient-name
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(lambda (ingredient)
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(if (= (length ingredient) 2)
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(car (cdr ingredient))
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(car (cddr ingredient)))))
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(define ingredient-amount
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(lambda (ingredient)
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(car ingredient)))
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;;
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(define ingredient-ref
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(lambda (ingredients n)
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(if (= n 0)
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(car ingredients)
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(ingredient-ref (cdr ingredients) (- n 1)))))
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(define ingredient-by-name
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(lambda (ingredients search-name)
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(let ((ingredient (car ingredients)))
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(cond [(equal? (ingredient-name ingredient)
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search-name)
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ingredient]
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[(null? (cdr ingredients)) #f]
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[else (ingredient-by-name (cdr ingredients)
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search-name)]))))
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(define contains-ingredient?
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(lambda (recipe search-ingredient)
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(let ((ingredients (ingredients recipe)))
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(ingredient-by-name ingredients search-ingredient))))
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(define contains-ingredients?
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(lambda (recipe search-ingredients)
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(let ((ingredients (ingredients recipe)))
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(cond [(null? search-ingredients) #t]
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[(ingredient-by-name ingredients
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(car search-ingredients))
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(contains-ingredients? recipe
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(cdr search-ingredients))]
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[else #f])
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)))
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(define recipes-by-ingredients
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(lambda (recipes search-ingredients list)
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(if (null? recipes)
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list
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(let* ((recipe (car recipes))
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(ingredients (ingredients recipe))
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(contains? (contains-ingredients? recipe
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search-ingredients)))
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(if contains?
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(recipes-by-ingredients (cdr recipes)
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search-ingredients
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(cons recipe list))
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(recipes-by-ingredients (cdr recipes)
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search-ingredients
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list))))))
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