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Good interface: Command pattern as an example
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Masafumi Okura
June 08, 2019
Programming
1
1.1k
Good interface: Command pattern as an example
Masafumi Okura
June 08, 2019
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Transcript
ྑ͍ΠϯλʔϑΣΠεͷ୳ٻ ίϚϯυύλʔϯΛྫʹ େխ࢙ʢ@okuramasafumiʣ ໊ݹRubyձٞ04―େਢԋܳ 2019-06-08ʢʣ
ࠓͷൃද͕͋ͪͪ͜ʹ ભҠ͍͖ͯ͠·͢ɻ མޠͩͱࢥָͬͯ͠Έͳ͕Β ͓͔͚͖͍ͬͯͯͩ͘͞!
pp self • ໊લɿ͢ͱ·͞;Έʢେխ࢙ʣ • ॴଐɿϑϦʔϥϯε • ׆ಈॴɿ౦ژ • ͖ͳgemɿPry,
RSpec • ӡӦͯ͠ΔίϛϡχςΟɿGrow.rb
໊ݹRubyձٞ
໊ݹRubyձٞ
զʑͳͥRubyΛ͏ͷ͔
Rubyͷ
զʑͳͥRubyΛ͏ͷ͔ • ॻ͖͍͢ • ʮॻ͖͢͞ʯͬͯͳΜͩΖ͏ • ಡΈ͍͢ • ʮಡΈ͢͞ʯͬͯ(ry •
Rails
զʑ͕RubyΛ͏ཧ༝
ϓϩάϥϛϯάָ͕͍͠
ͳͥRubyͰϓϩάϥϛϯάΛ͢Δͱ ָ͍͠ͷͩΖ͏͔ʁ
https://www.atmarkit.co.jp/news/ 200907/24/ruby2.html
yuguiɿ ͦΕɺίϨΫγϣϯ͕͋ͬͯγϟοϑϧ ͍ͨ͠ͱࢥͬͨΒɺshuffleͱॻ͍ͯɺͦΕ Ͱಈ͔ͳ͖Ό͍͚ͳ͍ΜͰ͢Αɻ
ࢥͬͨͱ͓Γʹಈ͘ ʢৗʹಈ͘ͱݴ͍ͬͯͳ͍ʣ
ͱ͜ΖͰɿ ͳΜͰ͜ͷΛ͍ͯ͠Δͷ͔
ָ͘͠ϓϩάϥϛϯάͰ͖Δ ྖҬΛ͍͛ͨʂ
ϥΠϒϥϦΛॻ͍ͯΈΑ͏ →ॻ͖·ͨ͠
https://github.com/okuramasafumi/ neco
150ߦͪΐ͍ͷϥΠϒϥϦ
2ճ΄Ͳॻ͖͍ͯ͠Δ
ΠϯλʔϑΣΠεʹೲಘ͕͍͔ͳ͔ͬͨ
ΠϯλʔϑΣΠεʹ͍ͭͯ ͍Ζ͍Ζߟ͑ͨͷͰɺ ͦͷՌʢʁʣΛڞ༗͍ͨ͠
ͦͦɿ ΠϯλʔϑΣΠεͬͯ ͳΜ͚ͩͬʁ
Interface (MacOSͷࣙॻΑΓ) 1. a point where two systems, subjects, organizations,
etc. meet and interact 2. Computing a device or program enabling a user to communicate with a computer
ΠϯλʔϑΣΠε ίϯϐϡʔλͱͷίϛϡχέʔγϣϯ ͷͱΓํΛܾఆ͢Δͷ
ΠϯλʔϑΣΠεʹϝιου
ΠϯλʔϑΣΠεʹϝιουγάχνϟ
ʮࢥͬͨͱ͓Γʹಈ͘ʯ
Ruby ΠϯλʔϑΣΠεʢ㲓ϝιουγάχνϟʣ ͕ྑ͍͔ΒΘΕ͍ͯΔ
DSL
ҎԼɺ ʮDSLʯʮݴޠDSLʯΛࢦ͠·͢
Domain Specific Language
Ruby͕ΘΕΔཧ༝ͷҰͭ
RubyʹΑΔDSLͷ۩ମྫ • ActiveRecordʢRailsܥʣ • RakeʢϏϧυܥʣ • RSpecʢBDDʣ • PuppetChefɺVagrantʢDevOpsܥʣ •
HomebrewʢύοέʔδϚωʔδϟʣ
ڞ௨
DSLԿ͔Λఆ͍ٛͯ͠Δ
RubyʹΑΔDSLͷ۩ମྫʢ࠶ܝʣ • ActiveRecordʢRailsܥʣ • RakeʢϏϧυܥʣ • RSpecʢBDDʣ • PuppetChefɺVagrantʢDevOpsܥʣ •
HomebrewʢύοέʔδϚωʔδϟʣ
RubyʹΑΔDSLͷ۩ମྫʢఆٛྫ͖ʣ • ActiveRecordʢσʔλϞσϧͷఆٛʣ • RakeʢϏϧυϓϩηεͷఆٛʣ • RSpecʢ·ΕΔৼΔ͍ͷఆٛʣ • PuppetChefɺVagrantʢ֤छΠϯϑϥϦιʔεͷఆٛʣ •
Homebrewʢύοέʔδͷఆٛʣ
ͱ͜ΖͰɿ DSL୯ͳΔΫϥεϝιου ʢͷ߹͕ଟ͍ʣ
ͭ·Γɿ DSL·ͨΠϯλʔϑΣΠε
͜͜·Ͱͷ·ͱΊ • ΠϯλʔϑΣΠε͕ྑ͍ͱָ͘͠ϓϩάϥϛϯάͰ͖Δ • ΠϯλʔϑΣΠεͱ͍͍ͩͨϝιουγάχνϟͷ͜ͱ • ֤ॴͰΘΕ͍ͯΔDSL࣮ͨͩͷϝιου • DSLʮఆٛʯʹڧ͍ •
ΠϯλʔϑΣΠεʮ७ਮͳϝιουʯͱDSLʹ͚ΒΕΔ
https://rubykaigi.org/2019/ presentations/tanaka_akr.html
ྑ͍ΠϯλʔϑΣΠεͬͯ ͳΜͩΖ͏ʁʁʁ
⚠ ͜Εͯ͢ࢲͷ୯ͳΔҰҙݟͰ͢ Ͳ͔ͬͪͱ͍͏ͱ͕΄͍͠… ࠙ձͰ͓͠·͠ΐ͏
ྑ͍ΠϯλʔϑΣΠεͷ̏ݪଇ • ໎Θͳ͍ • ґଘ͠ͳ͍ • ͤ͗͢ͳ͍
໎Θͳ͍ • ϝιου໊ʹࡾ୯ݱͷʮsʯඞཁ͚ͩͬʁ • ͋ͷΫϥεcallͰݺͿΜ͚ͩͬɺperform͚ͩͬʁ • Πϯελϯεϝιου͚ͩͬɺΫϥεϝιου͚ͩͬʁ • Ҿͷॱংʁ
ґଘ͠ͳ͍ • ϝιουνΣʔϯΛલఏͱ͠ͳ͍ʢಛఆͷฦΓʹґଘ͠ͳ ͍ʣ • ςετ࣌ͷελϒ͕ߴʑҰͭͰࡁΉ
ͤ͗͢ͳ͍ • ΤϯυϢʔβʔ͕ࣗྗͰͰ͖Δ͜ͱΒͳ͍ • ୯७ͳόϦσʔγϣϯʹෳࡶͳDSLຊʹඞཁ͔ʁ • ΤϯυϢʔβʔ͕ࣗྗͰΓͮΒ͍͜ͱΛΔ • νΣʔϯͨ͠ϩʔϧόοΫॲཧࣗྗͰ͍͠ʢޙड़ʣ
௨ৗͷϝιου͔DSL͔ɺ ͦΕ͕ͩ
શ෦ϝιουͰ͍͍͡ΌΜɺ DSLͱ͔֮͑Δͷେมͩ͠ʂ Pure Ruby࠷ߴʂ
ͱࢥͬͯͨ࣌ظ͕ʹ͋Γ·ͨ͠…
ϝιουΠϯλʔϑΣΠεͷॴ • ҾselfͳͲ͕ࣗ໌ • ܧঝͨ͠ͱ͖ʹಈ࡞͕ཧղ͍͢͠ • ͦ͜ʹʮࠇຐज़ʯͳ͍
ϝιουΠϯλʔϑΣΠεͷॴ • ॊೈͳڍಈΛఏڙ͢ΔࡍʹϢʔβʔ͕ॻ͖͘ϝιου͕ࡶ ʹͳΓ͕ͪ • ϥΠϒϥϦ͕ϑϩʔΛίϯτϩʔϧ͠Α͏ͱ͢Δࡍʹඞཁͳ ϑοΫΛࠩ͠ڬΉͷ͕͍͠ʢϢʔβʔʹଟͷϝιουΛఆ ٛͯ͠Β͏ඞཁ͕ग़ͯ͘Δʣ
DSLͷॴ • ϒϩοΫҾϝιουҾΑΓॊೈ • దʹ໋໊͞Ε͍ͯΔ߹ɺՄಡੑ͕ߴ͍ • ϥΠϒϥϦ͕ҙͷॲཧΛϢʔβʔఆٛͷॲཧʹڬΈࠐΊΔ ʢϑοΫΩϟογϡͳͲʣ • ԿΛ͍ͨ͠ͷ͔ͷʮఆٛʯΛએݴతʹॻ͚Δ
DSLͷॴ • ʮࠇຐज़ʯ͕ଟ͘ͳΓ͕ͪͷͰɺڍಈΛਖ਼֬ʹѲ͢Δͷ͕ࠔ • దʹ໋໊͞Ε͍ͯͳ͍߹ɺՄಡੑ͕ஶ͘͠མͪΔέʔε͕ ͋Δ • ϝλϓϩάϥϛϯάΛར༻͢Δ߹ɺσόοά͕ࠔʹͳΔ
ॊೈੑͷͰDSL͕༏Ґ
͡Ό͋શ෦DSLΛ༻ҙ͠·͘Ε ͦΕͰ͍͍ͷ͔ʂʁ
ࠇຐज़͡Όͳ͍ͷͦΕʁ
DSLຐज़͕͍ ʢby Joker1007ʣ
அ͕͍͠έʔε
ྫɿ όϦσʔγϣϯఆٛͳͷͰDSLΛ͏ ͔͠͠ɺܕνΣοΫΛDSLͰߦ͏͖͔ʁ
ճྫɿ ͤ͗͢ͳ͍ݪଇʹै͍ɺ࣮ࡍͷ όϦσʔγϣϯϢʔβʔʹͤΔɺ ϥΠϒϥϦόϦσʔγϣϯఆٛͷ ϑοΫDSLͷΈఏڙ
۩ମྫ ʢࠓճͷυϝΠϯίϚϯυύλʔϯʣ
NecoϏδωεϩδοΫΛ ʮίϚϯυʯʹׂ͠ɺ ͦΕΒΛΈ߹ΘͤΔϑϩʔΛ ࢧԉ͢ΔϥΠϒϥϦ
·ͱΊ • ͔ͤͬ͘RubyͰॻ͍ͯΔΜ͔ͩΒΠϯλʔϑΣΠεʹͩ͜Θ Γ͍ͨʢָ͍ͬͯ͠ϥΠϒϥϦ͕΄͍͠ʣ • DSLRubyͷڧΈͰ͋Γɺదʹ໋໊ɾ࣮͢Ε୯७ͳϝ ιουΑΓॊೈͳఆٛΠϯλʔϑΣΠεΛఏڙͰ͖Δ • ͕Μͬͯॊೈͳ͍উखΛࢦͯ͠ΔͷͰNecoͬͯ͘ΕΑͳʢએʣ