【2019/07/06 TamaRuby会議01】brainf*ck処理系で理解するパターンマッチングをつかった疎結合な実装

by Shu OGAWARA

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2019.07.06 TamaRuby 会議01 CSBJOGDLॲཧܥͰཧղ͢Δ ύλʔϯϚονϯάΛ͔ͭͬͨ ૄ݁߹ͳ࣮૷ Shu OGAWARA (@expajp)

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ࣗݾ঺հ ◈4IV0("8"3" !FYQBKQ ⬩ ϦϯΧʔζͱ͍͏ձࣾͰಇ͍͍ͯ·͢ ⬩ (SPXSC 0UFNBDIJSC (JO[BSC 4UFQ5P3BJMT&YQFSUͳͲ ⬩ ϓϥΠϕʔτͰ͸7VFKTॻ͍ͯ·͢ ⬩ झຯ͸߹এ 2

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3 5BNB3VCZձٞͷςʔϚ 3VCZJTUͱͯ͠ͷ੒௕

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4 ࠷ۙɺٸܹʹ 3VCZ͕੒௕͍ͯ͠Δ

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6 出典: https://speakerdeck.com/k_tsj/pattern-matching-new-feature-in-ruby-2-dot-7

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ύλʔϯϚονϯά ◈DBTFXIFOͷ͍͢͝൛ ʴ ෳ਺ม਺΁ͷ୅ೖʢଟॏ୅ೖʣ 7

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5XJUUFSͷ൓Ԡ ◈ؾʹͳΔʂ ◈ؾ࣋ͪΑ͘͸·ΔγνϡΤʔγϣ ϯ͕݁ߏ͋Γͦ͏Ͱ͍͍ ◈ه๏΋࢓༷΋Α͘ߟ͑ΒΕͯͯɺ ͱͯ΋ศརͦ͏ 8

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9 Ұํɺࣗ෼͕ࢥ͍ͬͯͨ͜ͱ

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10 ີ݁߹ίʔυͷԹচͳͷͰ͸ʁ

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11 ͓໿ଋʹࢥ͍͖ͬΓ൓͍ͯ͠Δ

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12 ಈతܕ෇͚ΦϒδΣΫτࢦ޲ݴޠɿ3VCZͷ͓໿ଋ ஌Βͳ͍஋͕དྷͨΒ ਖ਼ମ͸͍ͦͭࣗ਎ʹ஻ΒͤΖ ʢμοΫλΠϐϯά ʣ

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13 ड͚औΓଆΦϒδΣΫτ ೖྗ஋ ඞཁͳػೳΛఆٛ ͦΕʹ߹Θ࣮ͤͯ૷

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ྫʣϘΠεϨίʔμʔ ◈͜ͷεϥΠυͰͣͬͱ࢖͏ɺ ֓೦Λઆ໌͢ΔͨΊͷྫ ⬩ ௗͷ໐͖੠Λ࿥Ի͢ΔϨίʔμʔ ⬩ WPJDF@SFDPSEFSSFDPSE CJSE Ͱ࿥Ի͢Δ ⬩ WPJDF@SFDPSEFSQMBZͰ࠶ੜ͢Δ 14

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ྫʣϘΠεϨίʔμʔ 15 ඞཁͳػೳΛఆٛ

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ྫʣϘΠεϨίʔμʔ 16 ఆٛ͞Εͨػೳʹ ͋Θ࣮ͤͯ૷

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ྫʣϘΠεϨίʔμʔ 17

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ҰํɺύλʔϯϚονϯά͸ ◈ड͚औΓ͏Δ஋ʹԠͯ͡ɺ ύλʔϯΛ૿΍͢ ◈ࡍݶͳ͘ɺଞͷΦϒδΣΫτʹ ґଘͨ͠ίʔυ͕૿͑Δ ◈ີ݁߹ʹͳΔͷͰ͸ʁ 18

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19 ड͚औΓଆΦϒδΣΫτ ೖྗ஋ B " # $ͦΕͧΕड͚औͬͨࡍͷಈ࡞Λఆٛ ೖྗ஋ A ೖྗ஋ C

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ྫʣϘΠεϨίʔμʔ 20 ػೳ͕ఆٛ͞Εͯͳ͍ͷͰ উखʹ࣮૷

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ྫʣϘΠεϨίʔμʔ 21 ͦΕͧΕʹ͋Θͤͯ ड͚औͬͨࡍͷಈ࡞Λఆٛ

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22 3VCZʹೖΕΔͷ͸ ຊ౰ʹਖ਼͍͠ʁ

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24 ݕূͷํ๏ ΦϒδΣΫτࢦ޲ઃܭͰॻ͍ͨίʔυʹ ύλʔϯϚονϯάΛಋೖͯ͠ΈΔ

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୊ࡐʹ࢖͏ίʔυ ◈Ҏલॻ͍ͨCSBJOGDLॲཧܥ ⬩ ΦϒδΣΫτࢦ޲ͷษڧͷͨΊʹ ઃܭɾ࣮૷ͨ͠΋ͷ 25

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26 CSBJOGDL

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CSBJOGDL ◈ͭͷ໋ྩͱόΠτྻ͕͋Δ͚ͩ ⬩ ίϯύΠϥ͸όΠτ ⬩ ͕ͩνϡʔϦϯά׬શ ◈όΠτྻɾ໋ྩಡΈग़͠Ґஔ ʹ͔͠ׯবͰ͖ͳ͍ ⬩ ໋ྩ͸ɺόΠτྻͱ໋ྩಡΈग़͠Ґஔͷ ϑΟϧλͱଊ͑ΒΕΔ 28

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)FMMP 8PSME 29 +++++++++[>++++++++>+++++++++++> +++++<<<-]>.>++.+++++++..+++.>-.------------. <++++++++.--------.+++.------.--------.>+.

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CSBJOGDLॲཧܥ͸Ͳ͏࣮૷͔ͨ͠ 30 CSBJO'YDL ΤϯτϦʔϙΠϯτ͔Β ιʔείʔυಡΈࠐΜͰ࡞੒ ໋ྩྻ όΠτྻ ໋ྩ'BDUPSZ ॳظԽ࣌ʹ࡞੒ ͯ͠อ࣋

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CSBJOGDLॲཧܥ͸Ͳ͏࣮૷͔ͨ͠ 31 CSBJO'YDL ໋ྩྻ όΠτྻ ໋ྩ'BDUPSZ ໋ྩΛ ಡΈग़͠

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CSBJOGDLॲཧܥ͸Ͳ͏࣮૷͔ͨ͠ 32 CSBJO'YDL ໋ྩྻ όΠτྻ ໋ྩ'BDUPSZ ໋ྩΛ ಡΈग़͠ ໋ྩΛ౉͢ ໋ྩ ໋ྩ0CK ࡞੒ ໋ྩ0CK Λฦ͢

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CSBJOGDLॲཧܥ͸Ͳ͏࣮૷͔ͨ͠ 33 CSBJO'YDL ໋ྩྻ όΠτྻ ໋ྩ'BDUPSZ ໋ྩ ໋ྩΛ࣮ߦ ߋ৽͞ΕΔ ߋ৽͞ΕΔ

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CSBJOGDLॲཧܥ͸Ͳ͏࣮૷͔ͨ͠ 34 CSBJO'YDL ໋ྩྻ όΠτྻ ໋ྩ'BDUPSZ ࣍ͷ໋ྩΛ ಡΈग़͠

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35 ͯ͞ɺΑ͏΍͘४උ͕ ੔͍·ͨ͠

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36 ͜ΕΛύλʔϯϚονϯάͰ ॻ͖௚ͧ͢ʙ

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37 ʮʜʜʜʜʯ

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39 ॻ͖௚͢ͱ͜Ζ͕ ΄ͱΜͲͳ͍

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40 ͳͥͩΖ͏͔ʁ

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΄ͱΜͲͳ͔ͬͨཧ༝ ◈ιʔείʔυ͸จࣈྻͳͷͰɺ จࣈͣͭDBTFdXIFOͰ൑ผ͢Ε͹ྑ͍ ⬩ ໋ྩҎ֎ͷจࣈ͸ਖ਼نදݱͰফͤΔ ◈ଞͷՕॴͷೖྗ஋͸͢΂ͯࣗ෼Ͱ࣮૷͠ ͨΦϒδΣΫτͳͷͰɺ Θ͟Θ͟Ϛονͤ͞ͳͯ͘΋ Կ͕དྷΔ͔Θ͔Δ 41

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42 ͦ΋ͦ΋ ΠϯλϑΣʔε͕ἧ͑ΒΕΔͱ͜ΖΛ ύλʔϯϚονϯάͰஔ͖׵͑Δͷ͕ ؒҧ͍ͬͯΔ

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ύλʔϯϚονϯάͷڧΈ ◈ͲΜͳ஋͕དྷͯ΋Α͍ ◈ύλʔϯ͝ͱʹશ͘ผʑͷಈ࡞Λ ͤ͞ΒΕΔ ⬩ ଟॏ୅ೖ͕ಈ࡞ͷ෯Λ޿͛ɺ هड़Λγϯϓϧʹ͢Δ 43

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ΠϯλϑΣʔεΛἧ͑ΒΕΔঢ়گ ◈ೖྗ஋͕͋Δఔ౓͸༧ଌՄೳ ⬩ ໋ྩͷจࣈ PS໋ྩҎ֎ͷจࣈ ⬩ ʮͲΜͳ஋͕དྷͯ΋Α͍ʯػೳʹ͸߹Θͳ͍ ◈΍Γ͍ͨ͜ͱ͕௨Γ ⬩ όΠτྻͱ໋ྩྻ΁ͷϑΟϧλద༻ ⬩ ʮύλʔϯ͝ͱʹผʑͷಈ࡞͕ͤ͞ΒΕΔʯ ػೳʹ͸߹Θͳ͍ 44

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45 צҧ͍Ե

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46 ·ͯΑɺ͡Ό͋ ύλʔϯϚονϯά͕༗ޮͳঢ়گ ͬͯͳΜͩΖ͏ʁ

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47 ౰વ ΠϯλϑΣʔε͕ ἧ͑ΒΕͳ͍ঢ়گ

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ྫʣϘΠεϨίʔμʔ 48

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ྫʣϘΠεϨίʔμʔ 49 ड͚औΔՄೳੑͷ͋Δ ύλʔϯʹ͍ͭͯهड़

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ྫʣϘΠεϨίʔμʔ 50

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ྫʣϘΠεϨίʔμʔ 51 ૝ఆͯ͠ͳ͍஋ʹ͸ ྫ֎Λ্͛Δ

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ྫʣϘΠεϨίʔμʔ ◈ಈ෺Ͱ΋ָثͰ΋จࣈྻͰ΋ ରԠՄೳ͔ͭผʑͷಈ࡞ ◈Ϛον͠ͳ͚Ε͹ྫ֎Λ্͛Δ ⬩ ༧૝֎ͷ஋͸͔ͬ͠Γ஄͘ ⬩ OVMM҆શ 52

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53 ύλʔϯϚονϯάͷڧΈ ೖྗ஋͕શ͘༧૝Ͱ͖ͳ͍ͱ͖ ͲΜͳ஋Ͱ΋ରԠՄʹ͢Δ͜ͱͰ ड͚खͷೖྗ஋΁ͷґଘΛബΊΔ

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54 ଞํ μοΫλΠϐϯάͷڧΈ͸ ͜ͷཪฦ͠

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55 μοΫλΠϐϯάͷڧΈ ೖྗ஋͕͋Δఔ౓༧૝Ͱ͖Δͱ͖ ஋ʹಈ࡞Λ͠Ό΂ΒͤΔ͜ͱͰ ड͚खͷೖྗ஋΁ͷґଘΛബΊΔ

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56 ·ͱΊ μοΫλΠϐϯάͱ ύλʔϯϚονϯά͸ ࢖͍ॴ͕ҧ͏

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57 ͓Θͼ

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58 λΠτϧ࠮ٗ

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2019.07.06 TamaRuby 会議01 CSBJOGDLॲཧܥͰཧղ͢Δ ύλʔϯϚονϯάΛ͔ͭͬͨ ૄ݁߹ͳ࣮૷ Shu OGAWARA (@expajp)

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2019.07.06 TamaRuby 会議01 CSBJOGDLॲཧܥͰཧղ͢Δ ύλʔϯϚονϯάΛ͔ͭͬͨ ૄ݁߹ͳ࣮૷ Shu OGAWARA (@expajp)

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61 5BNB3VCZձٞͷςʔϚ 3VCZJTUͱͯ͠ͷ੒௕

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62 צҧ͍ͨ͠··$'1Λग़͕ͨ͠ ͓͔͛Ͱ ύλʔϯϚονϯάͷڧΈΛ஌Εͨ

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63 ٙ໰ʹਅ伨ʹ޲͖߹͑͹ צҧ͍ͯͯ͠΋ྑ͍͜ͱ͕͋Δ Fin.

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ࢀߟ ◈CSBJOGYDLॲཧܥ ⬩ IUUQTHJUIVCDPNFYQBKQCSBJOGYDL ◈ϘΠεϨίʔμʔͷαϯϓϧ ⬩ IUUQTHJUIVCDPNFYQBKQWPJDF@SFDPSEFS 64