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Writing simple and easy DSL with Ruby
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Masafumi Okura
January 29, 2022
Programming
2
200
Writing simple and easy DSL with Ruby
https://toyama-eng.connpass.com/event/233459/
Masafumi Okura
January 29, 2022
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Transcript
RubyͰ࡞ΔSimpleͰEasyͳ DSL Burikaigi 2022 ϧʔϜϗλϧΠΧ OKURA Masafumi, 2022
Ruby DSL
DSLͱʁ
None
Ҏ߱ͷ”DSL”ʮݴޠDSLʯΛࢦ͢ ͜ͱͱ͠·͢
RubyͰॻ͔ΕͨDSLͷྫʢRubyͰͷར༻ʣ • Rake • RSpec • FactoryBot • Sinatra •
Rails • ίʔϧόοΫɺόϦσʔγϣϯͳͲ
RSpecͷྫʢREADMEΑΓʣ
RubyͰॻ͔ΕͨDSLͷྫʢRuby֎Ͱͷར༻ʣ • Homebrew • Chef • Vagrant • Capistrano
HomebrewͷྫʢZoomͷCaskΑΓʣ
ݴޠDSLͷϝϦοτ • ϓϩάϥϛϯάݴޠͷϑϧػೳ͕͑Δ • มؔ • ಡΉ͚ͩͳΒϓϩάϥϛϯάݴޠͷ͕ࣝෆཁ • ϓϩάϥϛϯάݴޠͱઃఆϑΝΠϧͷ͍͍ͱ͜औΓ
ࣗݾհ • ໊લɿେխ࢙ • ॴଐɿϑϦʔϥϯε • ՝֎׆ಈɿKaigi on RailsνʔϑΦʔΨφΠβʔɺGrow.rb/Entaku.rb ΦʔΨφΠβʔɺAlba࡞ऀ
• ͖ͳRubyͷϝιουɿinstance_evalʢ2લͷൃදΛࢀরʣ
Alba • JSONγϦΞϥΠβʢҙͷΦϒδΣΫτΛJSONʹมʣ • ͍ʢྨࣅͷgemͱൺͯ2൪ʹ͍ʣ • 300ms͔͔͍ͬͯͨAPIΛ100ms·ͰߴԽͨ͠Γ • Ϣʔβʔ͕DSLΛॻ͘ͱAlba͕ͦΕʹैͬͯΦϒδΣΫτ͔ΒଐੑΛऔಘ ͯ͠JSONΛߏங͢Δ
• ৄࡉ https://github.com/okuramasafumi/alba Λࢀর
ࠓͷൃද ͷߏ
ೋ෦ߏ • ୈҰ෦ɿDSLʹؔ͢Δཧతߟ • RubyͱDSLɺϑΣʔζͷͳͲ • ୈೋ෦ɿDSLΛ࡞ͬͯΈΔ • ؆୯ͳDSLΛ࡞ͬͯΈΔ •
࣮͕SimpleͰ͍ํ͕EasyͳDSLΛ࡞Δ • λΠτϧճऩ
ୈҰ෦ɿ DSLʹ͍ͭͯͷ ߟ
ͳͥRubyͰ DSLΛॻ͘ͷ͔
RubyͰDSLΛॻ͘ཧ༝ • τοϓϨϕϧʢRubyͰ”main”ʣʹϝιουΛఆ͍ٛ͢͠ • ϝιουͷׅހ͕লུͰ͖ΔͷͰݟ͕ͨӳจͬΆ͘ͳΓ͍͢ • => ಡΈ͍͢ • ωετͨ͠ϒϩοΫͱ”eval”ϝιουͷΈ߹ΘͤΛ͏͜ͱͰෳ
ࡶͳϩδοΫදݱͰ͖Δ • => ॻ͖͍͢
ٯʹݴ͏ͱ • DSL୯ͳΔϝιουʢಛʹΫϥεϝιουʣ • evalͱϒϩοΫͷ͍ํ͑͞Θ͔ΕDSL࡞ΕΔʂ
Rubyʹ͓͚ΔDSLͷྨʹ͍ͭͯ • “main”ύλʔϯɿ”main”ʹϝιουΛఆٛ͢Δύλʔϯ • Rake, SinatraͳͲ • “include”ύλʔϯɿϞδϡʔϧʹσʔλͱϩδοΫΛू͠ɺ`include``extend`͠ ͨΫϥε͕ͦΕʹΞΫηεͰ͖Δύλʔϯ •
Railsͷଟ͘ͷDSL • ಠཱύλʔϯɿϞδϡʔϧΛ`include`͠ͳͯ͘DSLΛ͑Δ • RSpec, FactoryBotͳͲ
DSLͷ্࣮ͷίπ • ʮఆٛɾొʯʮࢦఆʯʮ࣮ߦʯͷϑΣʔζ͕͔Ε͍ͯΔͨΊɺ͜ ΕΒΛ͔ͬ͠Γ্ͭͭ͠खʹ݁߹͢Δ • ʮఆٛɾొʯϑΣʔζͰʮ࣮ߦʯϑΣʔζͰߦ͍͍ͨ͜ͱΛొ ͍ͯ͘͠ • ʮࢦఆʯϑΣʔζͰʮఆٛɾొʯ͞Εͨͷ͔Βࠓճద༻͍ͨ͠ ͷΛࢦఆ͢Δ
• ʮ࣮ߦʯϑΣʔζͰʮࢦఆʯ͞ΕͨͷΛ࣮ߦ͢Δ
ݱ࣮ͷDSLʹ͓͚ΔϑΣʔζͷ ఆٛ ࢦఆ ࣮ߦ 3BLF UBTL EFGBVMUͳͲ SBLFίϚϯυ 34QFD EFTDSJCF
JUͳͲ STQFDίϚϯυ 3BJMTόϦσʔγϣϯ A"DUJWF.PEFM7BMJEBUPSAΫ ϥεΛܧঝͨ͠Ϋϥεͷ࡞ WBMJEBUFTϝιου WBMJE ϝιου "MCB A"MCB3FTPVSDFAϞδϡʔϧ ΛAJODMVEFA͔ͯ͠Β ABUUSJCVUFTAͳͲ Ϋϥεબ TFSJBMJ[Fϝιου
ࠓճ࡞ΔDSLʹ͍ͭͯ • Γ͍ͨ͜ͱɿRailsͷόϦσʔγϣϯͷ؆қ൛ • ࣮ɿϞδϡʔϧΛ`include`͢ΔͱɺΫϥεϝιουͷ`.validates`ͱ Πϯελϯεϝιουͷ`#validate`͕ར༻ՄೳʹͳΔ • `.validates`ʹόϦσʔλͷ໊લͱΦϓγϣϯΛ͢ɺ͢ΔͱόϦ σʔλ͕Ϋϥεʹొ͞ΕΔ •
`#validate`ࣗͷΫϥεʹొ͞ΕͨόϦσʔλΛ࣮ߦ͢Δ
ʢଓʣࠓճ࡞ΔDSLʹ͍ͭͯ • ॳظঢ়ଶͰόϦσʔλ͕ଘࡏ͠ͳ͍ͨΊɺ`.validator`ϝιουͰఆ ͍ٛͯ͘͠ • ޙͰ`.validates`Ͱࢦఆ͢ΔͨΊͷ໊લͱɺϩδοΫʢόϦσʔγϣ ϯͷ༰ʣΛఆٛ͢Δ • ϩδοΫϒϩοΫͰఆٛ͢Δɺ͜ͷͱ͖ରͷΦϒδΣΫτͱඞ ཁͳʢ͞ΛόϦσʔτ͢ΔͳΒͦͷࣈʣΛड͚औΔ
͓·͚ͷߟ • ϓϩάϥϛϯάͰʮߏʯͱʮৼΔ͍ʯͷ2͕ͭॏཁ • cf. σβΠϯύλʔϯͷྨ • ʮఆٛɾొʯͱʮࢦఆʯߏͰʮ࣮ߦʯৼΔ͍ • ߏ੩తͰৼΔ͍ಈతɺͱ͍͑Δ
• DSLΛ͏ͱߏͱৼΔ͍ΛࣗવʹͰ͖ͯݟ௨͕͠ྑ͘ͳΔ
ୈೋ෦ɿ ࣮ࡍʹDSLΛ ࡞ͬͯΈΑ͏ʂ
ΤσΟλ͕։ ͖·͢