Ruby2.7の新機能で簡易版Rubyインタプリタを実装してみる

by fuqda

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Ruby2.7ͷ৽ػೳͰ  ؆қ൛RubyΠϯλϓϦλΛ  ࣮૷ͯ͠ΈΔ   2019/05/09 Hello hey for Engineers vol.3ɹɹ    fuqda(fuqda90)

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fuqdaͱਃ͠·͢ ʲܦྺʳ  4*FS ೥਺ϲ݄ ͔Β  ແڅΠϯλʔϯϲ݄Λܦͯ  4503&4KQ΁ྲྀΕண͖೥໨    ʲͦͷଞʳ  ීஈ͸5BNBSCͱ͍͏  ଟຎ஍Ҭ ٢঵ࣉʙീԦࢠ·Ͱ ͷ  ஍Ҭ3VCZίϛϡχςΟΛɹ  ओ࠵ͯ͠·͢

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ࠂ஌ ݸਓత

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݄ʹ5BNBSCͰ ΧϯϑΝϨϯε ΍Γ·͢✨

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ςʔϚ͸ʮRubyistͱͯ͠ͷ੒௕ʯ

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Tama Rubyձٞ01 ౔ d  ೚ҙࢀՃͷ࠙਌ձd·Ͱ   !ौ୩ηϧϦΞϯλϫʔ' (.0:PVST جௐߨԋɿҏ౻३Ұ͞Μ !KODIJUP   جௐߨԋɿޒेཛྷ๜໌͞Μ !JHBJHB   ͦͷଞ$'1ʴ5BNBSCϝϯόʔ-5

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CFPઈࢍड෇தͰ͢  (ҰൠࢀՃืू͸6݄։࢝༧ఆ) https://tama-rb.github.io/tamarubykaigi01/

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ࠓ೔ͷ͓࿩

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Ruby2.7ͷύλʔϯϚονΛ ࢼͯ͠ΈΔͱ͍͏࿩ 3VCZͷτϥϯΫ NBTUFS ʹ  1BUUFSO.BUDIJOHͱ͍͏৽ػೳ͕  ௥Ճ͞Ε͍ͯΔͱͷ͜ͱ  ͱ͍͏Θ͚Ͱʂຊ೔͸  ͦΕΛࢼͯ͠Έ·͢

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ิ଍ɿRubyKaigi2019Ͱͷ  ൃද͸ͪ͜Β https://speakerdeck.com/k_tsj/pattern-matching-new-feature-in-ruby-2-dot-7

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ࠓճ  ύλʔϯϚονϯάΛ ࢼ͢୊ࡐ

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3VCZͰ࡞Δ  ؆қ൛ 3VCZΠϯλϓϦλ ✨

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ʲલఏʳ ͜͜Ͱ࡞ΔΠϯλϓϦλʹ͍ͭͯ͸ɺ  िץΞεΩʔͰ࿈ࡌ͞Ε͍ͯͨ (2016.09~2017.01)  RubyͰֶͿRubyͷίʔυΛҰ෦ྲྀ༻͠ɺ  ͦ͜ʹखΛೖΕ͍ͯ͘ܗͰ  ਐΊ͍͖ͯ·͢ refs :ʮୈ5ճ RubyͰม਺෇͖ి୎Λ࡞ͬͯΈΔʯ https://ascii.jp/elem/000/001/230/1230449/

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ͦ΋ͦ΋ΠϯλϓϦλͬͯ… JUFSQSFUFSˠҙຯɿʮ௨༁ʯ    ਓ͕ؒॻ͍ͨιʔείʔυΛ  ಡΈࠐΜͰϓϩάϥϜͱͯ͠  ࣮ߦ͢ΔϓϩάϥϜͷ͜ͱ

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ྫ͑͹͜ΜͳࣜΛಡΈࠐΜͰ  ΠϯλʔϓϦλ͕ղऍ͢Δ৔߹

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ΠϯλϓϦλ͕  ΍Δ͜ͱͬͯʁ

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ࣈ۟ղੳ ߏจղੳ ࣮ߦ

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1. ࣈ۟ղੳ       จࣈྻΛͭͭ෦඼ͷ഑ྻʹม׵͢Δ     

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2. ߏจղੳ       ϓϩάϥϜͱ࣮ͯ͠ߦՄೳͳߏจ໦ʹม׵͢Δ     

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3. ࣮ߦ ߏจ໦Λೖྗͱͯ͠ϓϩάϥϜΛ࣮ߦ͢Δ

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ࣈ۟ղੳ ߏจղੳ ࣮ߦ ࣌ؒͷ౎߹ʹΑΓ ͷ ෦෼͸ग़དྷ߹͍ͷϥΠϒϥϦΛ ྲྀ༻͠·͢

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΍͍ͬͯ͘

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ࠓճͷࡐྉᶃ  ߏจղੳ༻ͷgem NJOSVCZ https://github.com/mame/minruby

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ࠓճͷࡐྉᶄ  ߏจ໦ΛRubyͱ࣮ͯ͠ߦ͢ΔΫϥε ࣮ߦ͢ΔϑΝΠϧ JOUFSQSFUFSSC

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ࠓճͷࡐྉᶅ  ߏจ໦Λ࡞ΔͨΊͷܭࢉࣜΛهࡌͨ͠Ϋϥε ίϚϯυ࣮ߦ͢ΔϑΝΠϧͷҾ਺ͱͳΔϑΝΠϧ ʮʯ͕هࡌ͞Ε͍ͯΔ͚ͩ GPSNVMBSC

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͡Ό࣮͋ࡍɺ 3VCZͷύλʔϯϚονϯάΛ ΠϯλϓϦλͷॲཧͰ࢖͏ͱͯ͠ɺ ͲΜͳ෦෼Ͱ࢖͑ΔͩΖ͏ʁ

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ߟ͑ͯΈΔ

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case~whenΛεοΩϦॻ͘  ͨΊʹ࢖͏ͷ͸Ͳ͏ͩΖ͏ʁ ɹɹɹɹ ߏจղੳޙͷ഑ྻ Λ ࠶ؼతʹݕࡧͯ͠Լهͷϝιουͷ 3VCZͱͯ͠  ࣮ߦ͢Δ෦෼ʹ  खΛೖΕͯΈΔ

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ࢼͯ͠ΈΑ͏

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ࠓճ࢖͏  ύλʔϯϚονϯάͷ छྨ ɹɹɹɹ˞ύλʔϯϚονϯάͷه๏ʹ͸  ɹɹɹɹ͍͔ͭ͘ͷόϦΤʔγϣϯ͕͋Γ·͢

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As Pattern DBTFʹ౉ͬͨ஋͕ ύλʔϯʹҰக͢Δͱ Ұகͨ͠஋ͱ  Ҏ߱ͷม਺Λ ඥ͚ͮΔ͜ͱ͕ग़དྷΔ

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ͦͷଞͷύλʔϯϚονϯάʹ͍ͭͯ 7BMVF1BUUFSO  7BSJBCMF1FUUFSO  "MUFSOBUJWF1BUUFSO  "SSBZ1BUUFSO  )BTI1BUUFSO ͪ͜Βͷهࣄ͕෼͔Γ΍͔ͬͨ͢ͷͰؾʹͳΔํ͸ͦͪΒ΁  !NBLJDBNFMʮ3VCZͷ৽ػೳ1BUUFSO.BUDIJOH͕࠷ߴͰͨ͠ʯ  IUUQTRJJUBDPNNBLJDBNFMJUFNTDEFGEFEC

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΍ͬͯΈͨ

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As PatternΛ࢖͏લޙͷมߋࠩ෼ ࠓճͷέʔεͰ͸࠶ؼॲཧΛॻ͔ͳͯ͘΋Α͘ͳΓ·ͨ͠  ଟগ͸γϡοͱॻ͚͔ͨ΋͠Ε·ͤΜɻ ΋ͬͱ៉ྷʹॻ͚ΔͩΖ͏͚Ͳࠓճ͸ΰϝϯͳ͍͞ʜ

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खݩͰಈ͔͢৔߹ ΋͠खݩͰࢼͯ͠Έ͍ͨ ͱ͍͏ํ͸HJTUʹιʔεΛ ஔ͍͓͖ͯ·ͨ͠ͷͰɺ ͦͪΒͰ΋͓ܰ͘ࢼ͠௖͚·͢ ஫) Rubyͷόʔδϣϯ͸2.7.0devͰ͢ https://gist.github.com/Shigeyuki-fukuda/37c2e9da1ac3744ea24920dacd25580f

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࣮ࡍʹಈ͔ͨ݁͠Ռ   SBJMTSVOOFSίϚϯυʹҾ਺Λ౉ͯ͠  ࣮ߦͯ͠Έͨͱ͜ΖΩϟϓνϟͷ௨Γ  ૝ఆ௨Γͷܭࢉ͕͞Ε·ͨ͠ ܭࢉ݁Ռ͕Ͱ͋Δ͜ͱΛ֬ೝ

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ײ૝

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ࠓճ΍ͬͯΈͯ… ࠓճ͸ɺͷΑ͏ͳԋࢉࢠͱ਺஋ͭͷ୯७ͳܭࢉࣜͰ͕ͨ͠ɺ ΍ԼهͷΑ͏ͳෳ਺ߦͷܭࢉʹରԠ͠Α͏ͱ͢Δͱ ΋͏গ͠࢖͍ํΛ޻෉͢Δඞཁ͕͋Γͦ͏Ͱ͢ ΋͏গ͠޻෉ͯ͠࡞Γ͔ͨͬͨͰ͕͢ɺ·ͨ࣍ͷػձʹ   ɹɹɹɹɹɹɹɹɹɹ ɹɹɹɹɹɹɹɹɹɹ FYෳ਺ߦͷܭࢉࣜΛಡΈࠐΉࡍͷྫ

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·ͱΊ

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RubyͬͯΠΠͰ͢ΑͶ✨ ࠓճ͸3VCZͷτϥϯΫʹ௥Ճ͞Εͨ ϕʔλ൛ͷύλʔϯϚονϯάΛ3VCZͷΠϯλϓϦλͷ࣮૷ ͱ͍͏έʔεΛྫʹ͍ͬͯ͡Έ·ͨ͠ ΍ͬͺΓ3VCZͰίʔυΛॻ͘ͷָ͍ͬͯ͠Ͱ͢ΑͶ✨☺ 3VCZͷདྷ೥ϦϦʔε͕ࠓ͔Βָ͠ΈͰ͢ SCFOW͔ΒखܰʹམͱͤΔͷͰ  ·ͩͷํ͸2.7Λࢼͯ͠Έͯ͸͍͔͕Ͱ͠ΐ͏͔