95 lines
3.0 KiB
Hy
95 lines
3.0 KiB
Hy
;; Copyright 2020 the authors.
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;; This file is part of Hy, which is free software licensed under the Expat
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;; license. See the LICENSE.
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(require [hy.contrib.sequences [seq defseq]])
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(import [hy.contrib.sequences [Sequence end-sequence]])
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(defn test-infinite-sequence []
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"NATIVE: test creating infinite sequence"
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(assert (= (list (take 5 (seq [n] n)))
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[0 1 2 3 4])))
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(defn test-indexing-sequence []
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"NATIVE: test indexing sequence"
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(defseq shorty [n]
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(cond [(< n 10) n]
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[True (end-sequence)]))
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(setv 0-to-9 (list (range 10)))
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(assert (= (get shorty 0)
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(get 0-to-9 0))
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"getting first element failed")
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(assert (= (get shorty 5)
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(get 0-to-9 5))
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"getting 5th element failed")
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(assert (= (get shorty -1)
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(get 0-to-9 -1))
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"getting element -1 failed"))
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(defn test-slicing-sequence []
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"NATIVE: test slicing sequence"
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(defseq shorty [n]
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(cond [(< n 10) n]
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[True (end-sequence)]))
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(setv 0-to-9 (list (range 10)))
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(assert (= (first shorty)
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(first 0-to-9))
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"getting first failed")
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(assert (= (list (rest shorty))
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(list (rest 0-to-9)))
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"getting rest failed")
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(assert (= (list (cut shorty 2 6))
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(list (cut 0-to-9 2 6)))
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"cutting 2-6 failed")
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(assert (= (list (cut shorty 2 8 2))
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(list (cut 0-to-9 2 8 2)))
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"cutting 2-8-2 failed")
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(assert (= (list (cut shorty 8 2 -2))
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(list (cut 0-to-9 8 2 -2)))
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"negative cut failed"))
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(defn test-recursive-sequence []
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"NATIVE: test defining a recursive sequence"
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(defseq fibonacci [n]
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(cond [(= n 0) 0]
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[(= n 1) 1]
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[True (+ (get fibonacci (- n 1))
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(get fibonacci (- n 2)))]))
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(assert (= (first fibonacci)
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0)
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"first element of fibonacci didn't match")
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(assert (= (second fibonacci)
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1)
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"second element of fibonacci didn't match")
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(assert (= (get fibonacci 40)
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102334155)
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"40th element of fibonacci didn't match")
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(assert (= (list (take 9 fibonacci))
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[0 1 1 2 3 5 8 13 21])
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"taking 8 elements of fibonacci didn't match"))
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(defn test-nested-functions []
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"NATIVE: test that defining nested functions is possible"
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(defseq primes [n]
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"infinite sequence of prime numbers"
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(defn divisible? [n prevs]
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"is n divisible by any item in prevs?"
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(any (map (fn [x]
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(not (% n x)))
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prevs)))
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(defn previous-primes [n]
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"previous prime numbers"
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(take (dec n) primes))
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(defn next-possible-prime [n]
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"next possible prime after nth prime"
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(inc (get primes (dec n))))
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(cond [(= n 0) 2]
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[True (do (setv guess (next-possible-prime n))
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(while (divisible? guess (previous-primes n))
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(setv guess (inc guess)))
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guess)]))
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(assert (= (list (take 10 primes))
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[2 3 5 7 11 13 17 19 23 29])
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"prime sequence didn't match"))
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