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Clojureの基礎 〜マクロ編〜
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OHTA Shogo
June 11, 2016
Programming
2
610
Clojureの基礎 〜マクロ編〜
2016/6/11 プログラミング言語基礎勉強会のLT発表資料です。
OHTA Shogo
June 11, 2016
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Transcript
$MPKVSFͷجૅ ϓϩάϥϛϯάݴޠجૅษڧձ 2016/06/11 @athos0220
ࣗݾհ ‣ 5XJUUFS!BUIPT ‣ χϟϯύε ג ॴଐ ‣ $MPKVSFίϯτϦϏϡʔλ
$MPKVSFͷجૅΛ࡞Δͷ ࠓճ-JTQͱͯ͠ͷಛʹϑΥʔΧε -JTQ ؔ ϓϩάϥϛϯά ରత ϓϩάϥϛϯά +7.
-JTQ
-JTQ ‣ લஔه๏͕ಛ ‣ ࠷ॳͷཁૉ͕ΦϖϨʔλɺͦΕҎ͕߱Ҿ ‣ ݴޠͷίΞ͕ඇৗʹγϯϓϧ (defn distance [x
y] (sqrt (+ (* x x) (* y y))))
-JTQ ‣ લஔه๏͕ಛ ‣ ࠷ॳͷཁૉ͕ΦϖϨʔλɺͦΕҎ͕߱Ҿ ‣ ݴޠͷίΞ͕ඇৗʹγϯϓϧ (defn distance [x
y] (sqrt (+ (* x x) (* y y)))) ΦϖϨʔλ Ҿ
$PEFBT%BUB ‣ $MPKVSFίʔυΛ؆୯ʹσʔλͱͯ͠ѻ͑Δ ‣ $MPKVSFͷσʔλͰίʔυΛॻ͍͍ͯΔͱ͍͑Δ (read-string “(* x x)”) ;=>
(* x x)
$PEFBT%BUB ‣ $MPKVSFίʔυΛ؆୯ʹσʔλͱͯ͠ѻ͑Δ ‣ $MPKVSFͷσʔλͰίʔυΛॻ͍͍ͯΔͱ͍͑Δ (read-string “(* x x)”) ;=>
(* x x) ͭͷγϯϘϧ Y Y͔ΒͳΔϦετ
ॲཧܥͰͷྲྀΕ ίʔυ จࣈྻ ίʔυ σʔλ όΠτίʔυ
ॲཧܥͰͷྲྀΕ ίʔυ จࣈྻ ίʔυ σʔλ όΠτίʔυ Ϧʔυ ίϯύΠϧ
ϚΫϩ
ϚΫϩͱ ‣ ίʔυ͔ΒίʔυͷมΛఆٛ͢Δؔ ‣ Ϣʔβ͕͖ͳΑ͏ʹߏจΛఆٛͰ͖ΔΈ ‣ ૉͳ͕Βڧྗͳϝλϓϩάϥϛϯάͷπʔϧ
ॲཧܥͰͷྲྀΕ ίʔυ จࣈྻ ίʔυ σʔλ όΠτίʔυ Ϧʔυ ίϯύΠϧ
ॲཧܥͰͷྲྀΕ ίʔυ จࣈྻ ίʔυ σʔλ όΠτίʔυ Ϧʔυ ίϯύΠϧ ϚΫϩల։
PSΛఆٛͯ͠ΈΔ ‣ ͭΊͷࣜͷ͕USVFͩͬͨΒͭΊΛབྷධՁ (or (expr-1) (expr-2)) (let [v (expr-1)] (if
v v (expr-2))) ల։
PSΛఆٛͯ͠ΈΔ (defmacro or [expr1 expr2] `(let [v# ~expr1] (if v#
v# ~expr2)))
XJUIPQFOΛఆٛͯ͠ΈΔ ‣ +BWBͷUSZXJUISFTPVSDFTͷΑ͏ͳߏจ (with-open [f (reader “foo”)] (write-to-file f)) (let
[f (reader “foo”)] (try (write-to-file f) (finally (.close f)))) ల։
XJUIPQFOΛఆٛͯ͠ΈΔ (defmacro with-open [[name file] body] `(let [~name ~file] (try
~body (finally (.close ~name)))))
࣮։ൃͰͷϚΫϩ
$PNQPKVSF ‣ $MPKVSFͷϧʔςΟϯάϥΠϒϥϦ (defroutes app-routes (GET “/” [] (index)) (GET
“/en” [] (index)) (GET “/fr” [] (index-fr)) (GET “/:greeting” [greeting] (view greeting)))
DPSFNBUDI ‣ ύλʔϯϚονϥΠϒϥϦ (match inst [:mov z x] (recur (subst
z x) insts) [:add z x y] (recur (do-op + z x y) insts) [:sub z x y] (recur (do-op - z x y) insts) [:push z x] (recur (push z x) insts) [:pop z] (recur (pop z) insts) [:jnz l] (if (:flag env) [l env] (recur env insts)) [:jz l] (if (:flag env) (recur env insts) [l env] …)
DPSFUZQFE ‣ ੩తܕνΣοΫϥΠϒϥϦ (ann new-file [(U URI String) -> File])
(defn new-file [s] (if (string? s) (File. ^String s) (File. ^URI s)))
DPSFBTZOD ‣ νϟωϧϕʔεͷඇಉظϓϩάϥϛϯάϥΠϒϥϦ (go (while true (let [v (<! ch)]
(println v)))) (go (loop [i 0] (>! ch i) (recur (inc i)))) ड৴ଆίʔυ ૹ৴ଆίʔυ
͓·͚ ‣ ϚΫϩඇৗʹڧྗͳͷͰѱ༻ͯ͠ݴޠࣗମΛେ෯ ʹม͑ͯ͠·͏͜ͱͰ͖Δ ‣ ྫʣΰϧϑ༻3VCZॲཧܥHPSVCZͷ฿ ϝιουΛॖܗͰݺΔ qFYNBUDIJOH
- 1.up(10) {|i| p i} - [1,4,9].ew{|x,i| ps “#{i}:#{x}”} upto each_with_index puts
HPDMPKVSF (doseq [[l n] (frequencies (map #(count (str %)) (keys
(ns-publics ’clojure.core))))] (printf “%2d %s\n” l (apply str (repeat n \*)))) ΦϦδφϧͷίʔυ
HPDMPKVSF (doseq [[l n] (frequencies (map #(count (str %)) (keys
(ns-publics ’clojure.core))))] (printf “%2d %s\n” l (apply str (repeat n \*)))) (goclojure (dq [[l n] (qs (mp #(ou (sr %)) (ks (nsb ’clojure.core))))] (pf “%2d %s\n” l (ay sr (rep n \*)))) ΦϦδφϧͷίʔυ HPDMPKVSFΛͬͯॻ͖͑ͨίʔυ
·ͱΊ ‣ -JTQͰ͋Δ͜ͱ$MPKVSFͷجૅΛ࡞Δཁૉͷͭ ‣ ϚΫϩڧྗͳϝλϓϩάϥϛϯάͷπʔϧ ‣ ࣮։ൃͰ͑Δ͞·͟·ͳศརϚΫϩ͕͋Δ ‣ ͨͩ͠ཚ༻͗͢͠Δͱίʔυ͕ಡΊͳ͘ͳΔͷͰɺ ຊʹඞཁͳγνϡΤʔγϣϯΛݟۃΊΔ͜ͱ