A technique to implement DSL in Ruby

by Masafumi Okura

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0,63".BTBGVNJ %4-Λ࡞Δͱ͖ʹศརͳςΫχ οΫ!3VCZ 3VCZͷ্ڃςΫχοΫ

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஫ҙɿૣޱͰ͢ɻ εϥΠυ͸ޙͰ্͛·͢ɻ ͝ҙݟ͝ײ૝͸νϟοτ͔5XJUUFSͰɻ

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ࣗݾ঺հ !PLVSBNBTBGVNJ w ໊લɿେ૔խ࢙ w ॴଐɿϑϦʔϥϯε w ׆ಈɿ,BJHJPO3BJMTͱ͍͏ΧϯϑΝϨϯεͷνʔϑΦʔΨφΠβʔͳͲ w 044ɿ"MCBʢ+40/γϦΞϥΠβ࣮૷ʣͳͲ w ৄࡉ͸IUUQTUFDIGFFEJPQFPQMF!PLVSBNBTBGVNJ

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3VCZͱ͍͑͹ɺ%4-

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3BLF 34QFD 4JOBUSB FUD

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%4-Λศརʹॻ͘ํ๏Λ͝঺հ

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ࠓճऔΓ্͛Δͷ͸ͪ͜Β

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ࣗ࡞ͷΫϥε಺ʹϚΫϩͬΆ͘ॻ ͍͍ͯ͘λΠϓʢΫϥεϚΫϩʣ

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࢖͍ํ

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ಈ͖ͷ֓ཁ Ϣʔβʔ໨ઢ w Ϟδϡʔϧʢ͜͜Ͱ͸A"MCB3FTPVSDFAʣΛJODMVEF͢ΔͱΫϥε ϝιουʢΫϥεϚΫϩʣ͕௥Ճ͞ΕΔ w ௥Ճ͞ΕͨΫϥεϝιουʢ͜͜Ͱ͸ABUUSJCVUFTAͳͲʣΛݺͿ͜ ͱͰΫϥε಺෦ʹ৘ใ͕஝ੵ͞ΕΔ w Πϯελϯεϝιουʢ͜͜Ͱ͸ATFSJBMJ[FAʣΛݺͿ͜ͱͰɺ஝ੵ ͞Εͨ৘ใͱҾ਺ͷΦϒδΣΫτʢ͜͜Ͱ͸AVTFSAʣ͔ΒಘΒΕ ͨ৘ใͱ߹Θͤͯ໨తͷ+40/Λऔಘ͢Δ

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಺෦ͷಈ࡞ ࣮ࡍͷίʔυ͸ޙͰڞ༗͢ΔࢀߟࢿྉΛݟͯͶ w Ϟδϡʔϧ͸AJODMVEFEAϑοΫΛఆٛ͠ɺͦͷதͰΠϯελϯεϝιο υͱΫϥεϝιουΛಉ࣌ʹ௥Ճ͠͞ΒʹԼهͷΫϥεΠϯελϯεม ਺ͷॳظ஋Λઃఆ͢Δ w ௥Ճ͞ΕͨΫϥεϝιουΛݺͿͱΫϥεΠϯελϯεม਺ʢ3VCZͰ͸ Ϋϥε͸ΦϒδΣΫτͳͷͰΠϯελϯεม਺Λ࣋ͯΔʣ͕ઃఆ͞ΕΔ w ΫϥεͷAJOJUJBMJ[FAϝιου಺Ͱࣗ਎ͷΫϥεʹઃఆ͞Ε͍ͯΔΫϥε Πϯελϯεม਺ΛऔΓग़͠ɺΠϯελϯεͷΠϯελϯεม਺ʹઃఆ ͢Δ

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՝୊

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ઃఆ͢Δ΂͖ΫϥεΠϯελϯε ม਺ͷ߲໨ͱॳظ஋͕ࢄΒ͹Δ

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ΫϥεͷܧঝΛߟ͑Δͱ͞Βʹ΍ ΍͍͜͠

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ΫϥεΠϯελϯεม਺͕ؔΘΔՕॴ w "MCB3FTPVSDF͕JODMVEF͞Εͨͱ͖ʹݩΫϥεʹΫϥεΠϯελ ϯεม਺Λॳظ஋ͱͱ΋ʹઃఆ w "MCB3FTPVSDFΛJODMVEFͨ͠Ϋϥε͕ΠϯελϯεԽ͞Εͨͱ͖ ʹΫϥεͷΫϥεΠϯελϯεม਺ΛΠϯελϯεͷΠϯελϯε ม਺ʹઃఆ w "MCB3FTPVSDFΛJODMVEFͨ͠ΫϥεΛܧঝͨ͠ͱ͖ɺ਌Ϋϥεͷ ΫϥεΠϯελϯεม਺ΛࢠΫϥεʹίϐʔ

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ղܾࡦ

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ࠓ೔ͷςΫχοΫ ఆ਺Λ࢖͓͏ฤ w ࢄΒ͹ͬͨ৘ใΛू໿͢Δͷʹఆ਺Λ࢖͏ w 3VCZͷఆ਺͸޿ൣғ͔ΒࢀরՄೳͰɺωετͨ͠ϋογϡͷΑ͏ͳ ෳࡶͳߏ଄Λอ࣋Ͱ͖ΔͷͰศར w ఆ਺ʹ֨ೲ͞Εͨॳظ஋Λઃఆ͍ͨ͠৔߹ɺADMPOFA·ͨ͸AEVQAΛ ࢖Θͳ͍ͱෳ਺ͷΦϒδΣΫτ͕ಉҰͷϝϞϦྖҬΛࢀরͨ͠Γมߋ ͨ͠Γͯ͠όάʹͳΔͷͰؾΛ͚ͭΑ͏ w

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ࠓ೔ͷςΫχοΫʢʣ ϝλϓϩάϥϛϯάฤ w େྔͷΠϯελϯεม਺Λઃఆ͍ͨ͠ͱ͖͸ϧʔϓͷதͰ AJOTUBODF@WBSJBCMF@TFUA͢Δͱศར w AJODMVEFEAͱAJOIFSJUFEAϑοΫΛ૊Έ߹ΘͤΔ͜ͱͰ࢖͍উखͷ ྑ͍%4-ΛఏڙͰ͖Δ