bcd0e42b33
Mine the phase* port batteries into the spec layer and delete them (their
behavior is now covered by spec): phase5 (hierarchies), phase6 (tagged
literals/reader-conditionals), phase7 (lazy/sets), phase8+phase12 (protocols;
phase12 was a duplicate of phase8), phase10 (strings/set), phase13
(reify/walk). Unique cases mined into spec: reader #inst/#uuid/#?@ splice,
(Type. args) dot constructor, lazy-seq body-runs-once, keywordize-keys/
stringify-keys, custom :default key and explicit :hierarchy dispatch.
phase6-final tested the COMPILE-MODE path ({:compile? true}), distinct from the
interpreter-based spec — kept and renamed integration/compile-mode-test.
jpm test green, conformance 218/218.
31 lines
1.8 KiB
Text
31 lines
1.8 KiB
Text
# Specification: lazy sequences.
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(use ../support/harness)
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(defspec "lazy / construction & laziness"
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["lazy-seq value" "[1 2 3]" "(take 3 (lazy-seq (cons 1 (lazy-seq (cons 2 (lazy-seq (cons 3 nil)))))))"]
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["not eagerly evaluated" "0" "(let [c (atom 0)] (lazy-seq (swap! c inc) nil) @c)"]
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["realized on demand" "1" "(let [c (atom 0) s (lazy-seq (swap! c inc) [1])] (first s) @c)"]
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["lazy-cat" "[0 1 2 3]" "(lazy-cat [0 1] [2 3])"]
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["doall forces" "[2 3 4]" "(doall (map inc [1 2 3]))"]
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["dorun returns nil" "nil" "(dorun (map inc [1 2 3]))"])
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(defspec "lazy / infinite"
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["take from repeat" "[7 7 7]" "(take 3 (repeat 7))"]
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["take from iterate" "[1 2 4 8]" "(take 4 (iterate (fn [x] (* 2 x)) 1))"]
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["take from cycle" "[1 2 1 2]" "(take 4 (cycle [1 2]))"]
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["take from range" "[0 1 2]" "(take 3 (range))"]
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["drop then take" "[5 6 7]" "(take 3 (drop 5 (range)))"]
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["filter infinite" "[0 2 4]" "(take 3 (filter even? (range)))"]
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["map infinite" "[0 1 4]" "(take 3 (map (fn [x] (* x x)) (range)))"]
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["nth of infinite" "100" "(nth (range) 100)"])
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(defspec "lazy / self-referential"
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["self-ref ones" "[1 1 1 1 1]" "(do (def ones (lazy-seq (cons 1 ones))) (take 5 ones))"]
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["self-ref nats" "[0 1 2 3 4]" "(do (def nats (lazy-cat [0] (map inc nats))) (take 5 nats))"]
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["self-ref fib" "[0 1 1 2 3 5 8 13 21 34]"
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"(do (def fib (lazy-cat [0 1] (map + (rest fib) fib))) (take 10 fib))"])
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(defspec "lazy / realized?"
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["unrealized" "false" "(realized? (lazy-seq (cons 1 nil)))"]
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["realized after" "true" "(let [s (lazy-seq (cons 1 nil))] (first s) (realized? s))"]
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["body runs once" "1" "(let [c (atom 0) s (lazy-seq (do (swap! c inc) [1 2 3]))] (seq s) (seq s) @c)"])
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