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େࡕ3VCZձٞ ౔ த೭ౡϑΣεςΟόϧλϫʔɾ΢Σετ ,PJDIJ*50&4. *OD .JOJGZ3VCZ$PEF Ruby Code Golf with Practical Code

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@koic w044ϓϩάϥϚʔ w3VCP$PQίΞνʔϜίϛολʔ wגࣜձࣾӬ࿨γεςϜϚωδϝϯτ &4. *OD ΤϯδχΞϦϯάϚωʔδϟʔ σΟεςΟϯάΠογϡυɾΤϯδχΞ

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3VCZηϛφʔ౦ژ ೥݄೔ ۚ σϑΥϧτʹ͍ۙઃఆͰ͔͑ͬͯಡΈʹ͍͘मਖ਼Λ͍ͯ͠Δํ΁ͷώϯτΛ

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Support OSS community

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w !LPJD1BSTFSHFNίϛολʔ w !KVOL-SBNBίϛολʔ w !4)(".&-*/,4QBSTFZίϯτϦϏϡʔλ w !GVHBLLCO3#4ίϯτϦϏϡʔλ w ෦һืूதʂ ߏจղੳثݚڀ෦ IUUQTNBHB[JOFSVCZJTUOFUBSUJDMFT'PMMPX6Q,JSJTIJNB3VCZIUNM

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.JOJGZ3VCZ$PEF ڝٕϓϩάϥϛϯάͰΈΔ 3VCZͷ๛͔͞ ʮಈ࡞͢Δ͖Ε͍Ͱ͸ͳ͍ίʔυʯͷ࿩ ࢓ࣄͰ͸ͦΜͳ໨ඪΛܝ͛·ͤΜͷͰ҆͝৺͍ͩ͘͞ dLPJD dIBSVHVDIJ

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ʰ-3Ͱ+40/ύʔαʔΛ࡞Δʱ w dKVOL 1SFNJVN4QPOTPS w dIBSVHVDIJ w dLPJD "TLUIF4QFBLFST ग़ுʂߏจղੳثݚڀ෦ 4QPOTPS-5 ݚᮎ3VCZϓϩάϥϛϯά ٳܜ࣌ؒʹϒʔε ͰखചΓ͞Ε·͢ Կ࡭Ͱ΋ങ͓͏ʂ

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ࠓ೔ͷ࿩

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w ൃද࣌ͷ࠷৽ͷ3VCZͰ͋ΔEFWͱɺ 1SJTNͷ࣍ͷ։ൃ൛Λલఏʹͯ͠·͢ ຊτʔΫʹ͓͚Δόʔδϣϯ $ ruby -rprism -ve 'p Prism::VERSION' ruby 3.4.0dev (2024-07-30T06:31:58Z master 1870505f47) [x86_64-darwin23] "0.30.0" # ݫີʹ͸0.31.0޲͚ͷ։ൃ൛ rbenv install 3.4-devͳͲͰ͓खݩʹΠϯετʔϧ

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.JOJGZͷݱ࣮ͱՄೳੑ 1SJTN"1*ͱ-FYFS .JOJGZ3VCZ$PEF ໨࣍

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.JOJGZͷݱ࣮ͱՄೳੑ

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w ιʔείʔυͷαΠζΛখ͘͢͞Δ w 8FCͷੈքͰ͸ɺ)5.- +BWB4DSJQU $44 ͳͲϦιʔεͷωοτϫʔΫసૹྔΛݮΒ͢ w ϓϩάϥϛϯάݴޠͷ.JOJGZπʔϧͱͯ͠ɺ ྫ͑͹+BWB4DSJQUͰ͸6HJMJGZ+4 5FSTFSͳͲ .JOJGZͱ͸ʁ

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+BWB4DSJQUઌഐͰͷ.JOJGZྫ function greet(name) { console.log(`Hello! ${name}`); } greet("Osaka RubyKaigi 04"); // Hello, Osaka RubyKaigi 04! HSFFUKT $ npx terser greet.js function greet(name){console.log(`Hello! ${name}`)}\ greet("Osaka RubyKaigi 04"); .JOJGZ͢Δ εϖʔεͷ౎߹ʹ͖࣮ͭࡍ͸ߦ

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w ಈ࡞͢ΔͨΊʹඞཁͷͳ͍εϖʔεɺվߦɺ ίϝϯτɺηϛίϩϯͷྨΛআڈ͢Δ w ϨΠΞ΢τ΍ߦؒΛ่͠ɺݟͨ໨Λ6HMJGZ͢Δ w ʮಈ࡞͢Δ͖Ε͍ͳίʔυʯͱҟͳΔՁ஋؍ ಈ࡞͢Δ୹͍ίʔυ $ npx terser greet.js | tee >(node) function greet(name){console.log(`Hello! ${name}`)} greet("Osaka RubyKaigi 04"); Hello! Osaka RubyKaigi 04 UFSTFSͷ݁ՌΛϓϩηεஔ׵Ͱ࣮ߦͨ݁͠Ռ

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w ಉ͡ৼΔ෣͍ͳΒ୹͍ํ͕ྑ͍ w ܭࢉػʹͱͬͯίʔυՄಡੑ͸ॏཁͰͳ͘ɺ ωοτϫʔΫసૹΛқ͘͢͠Δͷ͕࣮ફత w લड़ͷαϯϓϧίʔυͰ͸ʹѹॖ͞ΕΔ .JOJGZͷՁ஋؍ $ wc -c greet.js 120 greet.js $ npx terser greet.js | wc -c 80

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w $PNQSFTT͸ɺෆཁͳεϖʔε΍ίϝϯτͷ ࡟আ΍ɺߏจͷ୹ॖԽʹΑͬͯɺϓϩάϥϜ ͷ͍ͨΔՕॴΛ୹͘͢Δ ຊฤ͸͜ͷҰ෦ w .BOHMF͸ม਺໊΍ؔ਺໊Λ୹ॖ͢Δ w ಉ͡ৼΔ෣͍ͷ··ʮѹྗʯ͕ΑΓ ߴ͍ํ͕ɺΑΓՁ஋͋Δ୹͍ίʔυ $PNQSFTTͱ.BOHMF

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ͦ΋ͦ΋ͳͥ .JOJGZ

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w 3BJMTΞϓϦέʔγϣϯͷσϓϩΠΛಛఆͷ αʔόʔʹߦͳ͍ɺͦ͜ʹରͯ͠ϦΫΤετ ͕ूத͢Δݱ୅Ͱ͸ແԑ w ΋͠.JOJGZࡁΈίʔυ͕σϓϩΠ͞ΕΔͱɺ ໰୊͕ى͖ͨͱ͖ߦ൪߸͕ࢦ͔͢Β໰୊Օॴ ͷಛఆ͕ࠔ೉ʹͳͬͯࠔΔ ͦΕ͸ͦ͏ ݱ୅ͷ͓࢓ࣄ3VCZͩͱͲ͏ʁ

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w ໝ૝ͦͷɻSVCZXBTNͷίʔυͰ֎෦Ϧιʔ εΛཁٻͨ͠ࡍʹɺ*4FRͳͲͷதؒදݱͰͳ͍ QMBJOͳ3VCZίʔυͷωοτϫʔΫసૹྔݮʁ w ໝ૝ͦͷɻΤοδίϯϐϡʔςΟϯάͰɺΤο δαʔόʔ $%/ ΍ΤοδσόΠε *P5 ΁ͷ ίϯςϯπ΍σʔλͷ഑෍ʹ͓͍ͯ༗༻ʁ ະདྷͷ͓࢓ࣄ3VCZͩͱͲ͏ʁ NJOJGZ͸1JDP3VCZͷϝϞϦ࡟ݮʹ࢖͑Δ͸ͣͳͷͰ஫໨͍ͯ͠·͢ɻ IUUQTYDPNIBTVNJLJOTUBUVT

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w དྷ೥3VCZ,BJHJ দࢁ Ͱ53*$, ͕։࠵͞ΕΔΒ͍͠Ͱ͢Αʁ w ࢓ࣄ΍044Ͱ໨ࢦ͍ͯ͠Δʮಈ࡞͢Δ͖Ε͍ ͳίʔυʯͰ͸ͳ͍෯Λ࡞ΔػձॏཁͰ͸ʁ w .JOJGZ͢Δͷʹ͸ʮιʔείʔυͷղੳʯ͕ ඞཁͰͦΕ͸͢ͳΘͪɺ͍·ྲྀߦΓͷʂʁ དྷ೥ͷ3VCZΠϕϯτͩͱͲ͏ʁ

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ߏจղੳث .BU[͸ݴ͍·ͨ͠ύʔαʔͱ($ͱίʔυδΣωϨʔλʹ͸ۙͮ͘ͳ

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1SJTN"1*Ͱιʔεղੳ

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ࣈ۟ղੳͱߏจղੳͷར༻ྫ ࣈ۟ղੳ ߏจղੳ ੩తղੳ Ϩϙʔτ ιʔείʔυ ೖྗ ॲཧ ग़ྗ

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w τʔΫϯྻ͸ιʔείʔυΛࠨ͔ΒӈʹಡΜͩ τʔΫϯͷ഑ྻ w ߏจ໦͸ϓϩάϥϜͷߏจߏ଄Λϊʔυͱͯ͠ πϦʔߏ଄Ͱදݱ͍ͯ͠Δ w ྫ͑͹ΫϥεఆٛͷϊʔυͷԼʹϝιουఆٛͷ ϊʔυ͕͋ΔͳͲߏจ໦ͷํ͕๛͔ͳσʔλߏ଄ τʔΫϯྻͱߏจ໦

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w γϯϘϧΛҾ਺ʹͨ͠ϝιουݺͼग़͠ τʔΫϯྻͷαϯϓϧ puts :hello [:IDENTIFIER, :SYMBOL_BEGIN, :IDENTIFIER, :EOF] puts : hello %w(foo) [:PERCENT_LOWER_W, :STRING_CONTENT, :STRING_END, :EOF] w ཁૉͻͱͭͷXϦςϥϧ %w( foo )

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ߏจ໦ͷαϯϓϧ $ ruby -rprism -e 'p Prism.parse("42").value' @ ProgramNode (location: (1,0)-(1,2)) ├── flags: ∅ ├── locals: [] └── statements: @ StatementsNode (location: (1,0)-(1,2)) ├── flags: ∅ └── body: (length: 1) └── @ IntegerNode (location: (1,0)-(1,2)) ├── flags: newline, static_literal, decimal └── value: 42 Prism.parseͰPrism::ParseResultΛಘΔ

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ߏจ໦ ࠓճׂѪ ࠓ೔͖ͬͱۚࢠ͞Μ͕୔ࢁ࿩͍ͯ͠Δʂ

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w 3VCP$PQͷΑ͏ʹߏจͷैଐؔ܎Λ૸ࠪ͠ ͯɺΦʔτίϨΫτͰߏจॻ͖׵͍͑ͨ͠Α ͏ͳέʔε͸ߏจ໦Λѻ͑ͳ͍ͱ೉͍͠ w ࠓճͷ.JOJGZ࿩Ͱ͸جຊతʹߏจΛॻ͖׵͑ ͳ͍ͷͰɺτʔΫϯྻͰे෼ͱ͍͏൑அ τʔΫϯྻͱߏจ໦ͷ࢖͍෼͚ ͬ͘͟Γ͍͏ͱߏจߏ଄΁ͷॲཧ͢ΔͱͳͬͨΒߏจ໦͕ཉ͘͠ͳΔ

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ࠓճ͸τʔΫϯྻ

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w Ripper.lexͱPrism.lex͍ͣΕ΋ϓϩάϥϜ ͷτʔΫϯྻΛखʹೖΕΔ͜ͱ͕Ͱ͖Δ"1* w ͔ͤͬ͘ͳͷͰɺ·ͩ৘ใ͕গͳ͍1SJTNΛ࢖ͬ ͯΈͨํ͕͓΋͠Ζͦ͏ ϓϩϙʔβϧతʹ΋ w Prism.lex_ripperͱPrism.lex_compat͸ 3JQQFSʹ͍ۙ"1*͕ͩɺࠓճૉ௚ʹPrism.lex 3VCZͷτʔΫϯऔಘ"1*બఆ

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1SJTNMFYͷجຊ"1*

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w Prism.lexϝιουͰղੳ݁ՌΛද͢ Prism::LexResultΦϒδΣΫτΛಘΒΕΔ w 📝1SJTN·ͰPrism::ParseLexResult Λޡͬͯฦͯ͠Δ ৄ͘͠͸SVCZQSJTN 1SJTNMFY require 'prism' result = Prism.lex('puts :hello') result.class #=> Prism::LexResult

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w LexResult.valueͰτʔΫϯΛද͢ Prism::TokenͱMFYTUBUF CJU஋ ͷ഑ྻ֫ಘ w MFYTUBUF஋͸Լهࢀর ຊฤະ࢖༻ʹׂ͖ͭѪ 1SJTN-FY3FTVMU require 'prism' result = Prism.lex('puts :hello') result.value.class #=> Array result.value.first #=> [#, 32] IUUQTHJUIVCDPNSVCZQSJTNCMPCWJODMVEFQSJTNQBSTFSI--

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w LexResult.valueͷ഑ྻͷୈҰཁૉ Prism::Token͸ܕɺ஋ɺҐஔ৘ใΛ࣋ͭ 1SJTN5PLFO result = Prism.lex('puts :hello') token, _state = result.value.first token.class #=> Prism::Token token.type #=> :IDENTIFIER token.value #=> "puts" token.location.class #=> Prism::Location

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w ParseToken.locationͰτʔΫϯͷҐஔ ৘ใΛ࣋ͭPrism::LocationΛಘΒΕΔ 1SJTN-PDBUJPO result = Prism.lex('puts :hello') token, _state = result.value.first location = token.location location.first_line #=> 1 location.start_offset #=> 0 location.length #=> 4

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τʔΫϯॲཧͷఆੴαϯϓϧ tokens = Prism.lex(source).value tokens.each_cons(2)do|(token,_),(next_token,_)| case token.type when :COMMENT # do_something when :IDENTIFIER # do_something end prev_token = token end FBDI@DPOT Ͱ࣍ͷτʔΫϯ৘ใΛઌಡΈ͢Δ QSFW@UPLFOͰલͷτʔΫϯ৘ใΛอ͓࣋ͯ͘͠ ͜ͷ͋ͱ঺հ͢Δ.JOJGZ3VCZ͸͜ͷͭ͘Γ UPLFOUZQFͷछྨͰॲཧΛ൑ผ͢Δ ࠨ͔Βӈ΁ͷτʔΫϯྻͷϧʔϓ

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ࣈ۟ղੳͱߏจղੳͷར༻ྫ ࣈ۟ղੳ ߏจղੳ ѹॖॲཧ ѹॖ͞Εͨίʔυ ιʔείʔυ ೖྗ ॲཧ ग़ྗ

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.JOJGZ3VCZ$PEF

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github.com/koic/minifyrb

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w minifyrbίϚϯυͰɺෆཁͳίʔυ෦෼ɺ ͭ·ΓτʔΫϯΛআڈͯ͠ίʔυΛѹॖ͢Δ .JOJGZ3VCZHFN $ gem i minifyrb $ echo "puts :hello" | minifyrb puts:hello

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0SJHJOBM$PEF

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.JOJ fi FE$PEF

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ઃܭํ਑

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w ͳͯ͘΋ྑ͍ۭന΍վߦΛۃྗআڈ͢Δ w ίϝϯτΛআڈ͢Δ w ඞཁʹԠͯ͡ηϛίϩϯʹΑΔϫϯϥΠφʔ w ม਺໊΍ϝιου໊Λ୹ॖ͢Δ.BOHMF͸ ෳࡶʹͳΔͨΊߦΘͳ͍ ࠓޙͷల๬࿮ ݱ࣌఺ͷجຊతͳߟ͑ํ

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w {}ϕʔεͷߏจͱͳΔ+BWB4DSJQUͰ͸ྫ͑͹ functionΛҰߦͰෳ਺ఆٛͰ͖Δ +BWB4DSJQUͷϫϯϥΠφʔʹֶͿ $ cat example.js | tee >(npx terser) function foo() { console.log(bar()); } function bar() { 42; } function foo(){console.log(bar())}function bar(){42} εϖʔεɺηϛίϩϯෆཁ ಡΈ΍͢͞ͷվߦΛ͢Δ

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w FOEϕʔεͷߏจͱͳΔ3VCZͰ͸ྫ͑͹վߦ Ληϛίϩϯʹஔ͖׵͑ͯ΋ɺ݁ہόΠτ ͷαΠζֻ͕͔Δ͜ͱ͸มΘΒͳ͍ w FOE͸^ͱൺ΂ɺ۠੾Γεϖʔε͕ඞཁ͔൑அ w ౰ॳ͸σόοά࣌ͷߦ൪߸Λ஌ΔҙຯͰ΋ɺ ෳ਺ߦͷ··Ͱྑ͍ͱ͍͏τϨʔυΦϑ൑அ 3VCZͷϫϯϥΠφʔ ِ 1όΠτ

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w FOEϕʔεͷߏจͱͳΔ3VCZͰ͸ྫ͑͹վߦ Ληϛίϩϯʹஔ͖׵͑Δͱɺ8JOEPXTͳΜ ͔ͷaSaOͷόΠτվߦ͸όΠτʹݮΒͤΔ w .JOJGZͱ͍͏ํ਑ʹ͓͚ΔτϨʔυΦϑ൑அ͸ ໰୊௥੻ੑΑΓ΋୹͍ίʔυΛऔΔ w ݁Ռͱͯ͠෭࡞༻ʹएׯͷ೉ಡԽ͕͍͖ͭͯͨ 3VCZͷϫϯϥΠφʔ ਅ

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Prism.lex͸&SSPS5PMFSBODFʹͳͬͯΔ &SSPS5PMFSBODF $ ruby -ce 'cond(arg)?x:y' # εϖʔεͳ͠ѹॖ͸ߏจΤϥʔͷྫ -e:1: syntax error, unexpected symbol literal, expecting 'do' or '{' or '(' cond(arg)?x:y ruby: compile error (SyntaxError) $ ruby -ce 'cond(arg)?x: y' # ͜ͷ৔߹:ͱyͷؒʹཁεϖʔε Syntax OK $ ruby -rprism -e "p Prism.lex('cond(arg)?x:y').value" [[#

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w .JOJGZ͸-41ͷΑ͏ͳೖྗ్தͷίʔυΛॲཧ ͢Δ΋ͷͰ͸ͳ͍ w ಈ͔ͳ͍ίʔυΛ.JOJGZͯ͠΋࢓ํͳ͍ͷͰɺ ݩίʔυ͕ߏจΤϥʔͷͱ͖͸Τϥʔͱͨ͠ w Prism.lex(code).errorsͷ݁Ռ഑ྻ΍ Prism.parse_success?Ͱ஌Δ͜ͱ͕Ͱ͖Δ &SSPS5PMFSBODF΁ͷ൑அ Prism::ParseLexResult#errors

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τʔΫϯॲཧͷ࣮૷

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w *(/03&%@/&8-*/&ଥ౰ͳγϯλοΫ εͰ͋ΔͨΊʹෆඞཁͳվߦ ୯ʹ࡟আՄೳ w /&8-*/&ଥ౰ͳγϯλοΫεͰ͋Δͨ Ίʹඞཁͳվߦ ୯ʹ࡟আ͢ΔͱߏจΤϥʔ छྨͷվߦτʔΫϯ ݱࡏͷ1SJTN ࣮૷ͩͱظ଴ͱҧ͏෦෼΋͋Γޙड़

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w ͜ͷվߦ͕ͳ͘ͳͬͯ΋ߏจͱͯ͠ଥ౰Ͱ͋Δ w ηϛίϩϯͳ͠Ͱվߦ࡟আ͸Ͳ͜·ͰͰ͖Δʁ *(/03&%@/&8-*/&τʔΫϯ begin rescue CustomError=>e else ensure end ݩ͸όΠτ aOͷ৔߹ begin rescue CustomError=>e else ensure end *(/03&%@/&8-*/&ద༻ όΠτ begin rescue CustomError=>e;else ensure end ࢀߟผ్ηϛίϩϯஔ׵ όΠτ

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w ʮಈ࡞͢Δ͖Ε͍Ͱ͸ͳ ͍ίʔυʯ͕ຊτʔΫͷ ςʔϚͰ͢Α w .JOJGZͱ53*$,೴͸ີ઀ ʹؔ࿈͢ΔԾઆ w 53*$,ͷLJOBCB͞ Μ࡞඼ͷཧղʹ͚ۙͮΔʁ ͜ͷτʔΫϯ͔ΒಘΒΕΔֶͼ IUUQTHJUIVCDPNUSJDUSJDLCMPCNBTUFSLJOBCBFOUSZSC 53*$,໊࡞ͷͻͱͭ

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w "\r\n"͔΋͠Εͳ͍վߦΛ۠੾ΓτʔΫϯʹ ͢Δ͜ͱͰόΠτ਺ΛݮΒͤΔՄೳੑ͕͋Δ w *(/03&%@/&8-*/&ͱҧ͍ɺdef foo͕ deffooʹͳΒͳ͍Α͏దٓ۠੾Γௐ੔͕ඞཁ w ࣍τʔΫϯͷܕ͕&0'ͷ৔߹͸104*9४ڌͷ ςΩετϑΝΠϧͱ͢ΔͨΊվߦΛҡ࣋͢Δ /&8-*/&τʔΫϯ

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104*9४ڌҧ൓👮 (JU)VCͷΞϨ /&8-*/& &0'

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w BMJBTFRM ͕BMJBTFRM ͸ߏจΤϥʔ w GPP 'PP͕GPP 'PP͸ҙຯ͕มΘΔ w BSSBZ͕BSSBZ͸ߏจΤϥʔ w GPPX BCD ͕GPPX BCD ͸ҙຯ͕มΘΔ w GPPX BGPSC ͕GPPX BGPSC ͸ߏจΤϥʔ ݁߹ͯ͠͸͍͚ͳ͍γϦʔζͷҰ෦ unexpected char literal unexpected operator assignment unexpected ')'

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w ด͡Χοίલͷվߦ͸IGNORED_NEWLINEʹͰ͖Δ ͸͕ͣͩɺΧϯϚͳͩ͠ͱNEWLINEͱ͞ΕΔ ҙਤతͳ3JQQFSޓ׵ɺSVCZQSJTNࢀর w ;΁ͷ୯७ͳஔ׵͸[foo, bar, baz;]ͷߏจΤϥʔ <ิ଍>୯७ͳηϛίϩϯஔ׵͸ෆՄ [ foo, bar, baz ] :BRACKET_LEFT_ARRAY,:IGNORED_NEWLINE :IDENTIFIER, :COMMA,:IGNORED_NEWLINE :IDENTIFIER, :COMMA,:IGNORED_NEWLINE :IDENTIFIER, :NEWLINE :BRACKET_RIGHT, :NEWLINE, :EOF

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վߦͷτʔΫϯॲཧ֓ཁ tokens.each(2) do |(token, _), (next_token, _)| case token.type when :IGNORED_NEWLINE # noop when :NEWLINE token_value = if next_token.type == :EOF token.value elsif CLOSING_DELIMITER_TYPES.include?(next_token.type) # noop else ';' end 104*9ͷΞϨ΁ͷOFXMJOFରԠ Ճ͑ͯɺdeffooͳͲ༧໿ޠ͕݁߹͠ͳ͍Α͏ͳॲཧΛผ్͍ͯ͠Δ > ^ͷτʔΫϯͷఆ਺ɻຊདྷ*(/03&%@/&8-*/&͔΋ͳύον

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w )&3&%0$@45"35ͱ)&3&%0$@&/%ͷ τʔΫϯʹғ·ΕͨτʔΫϯ͕ຊจ )&3&%0$@ 45"35c&/% τʔΫϯ <

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w γϯϓϧͳώΞυΩϡϝϯτͳΒ )&3&%0$@45"35͔Β)&3&%0$@&/%· ͰͷτʔΫϯ஋Λ݁߹͢Ε͹ऴΘΓͦ͏ w τʔΫϯྻ͸ιʔείʔυΛࠨ͔ΒӈʹಡΜ ͩ݁Ռͷ഑ྻͱݴͬͨͳʁ ώΞυΩϡϝϯτ

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w :DOT, :IDENTIFIER͸:HEREDOC_STARTʹ ଓ͘τʔΫϯͰ͸ͳ͍ w ώΞυΩϡϝϯτΛจࣈྻϦςϥϧͷҰछͩͱࢥ ͑͹"text".do_somethingͳͷͰͦΕ͸ͦ͏ )&3&%0$EP@TPNFUIJOH <

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w ୹͍όΠτ਺ʹ͢Δํ਑ʹج͖ͮIFSFEPD͸ จࣈྻϦςϥϧʹஔ׵͢Δ͜ͱͱͨ͠ w )&3&%0$@45"35͔Β)&3&%0$@&/%· Ͱ͸ώΞυΩϡϝϯτͰ͋Γɺdͷ৔߹͸ IFSFEPDऴྃͰEFEFOU͢ΔΑ͏ঢ়ଶΛอͭ )&3&%0$EP@TPNFUIJOH <

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IFSFEPDͷτʔΫϯॲཧ֓ཁ tokens.each(2) do |(token, _), (next_token, _)| case token.type when :HEREDOC_START @in_heredoc = true squiggly_heredoc = token.value.start_with?('<<~') # SNIP: <<'HEREDOC', <<"HEREDOC", <<`HEREDOC`΁ͷॲཧׂѪ when :HEREDOC_END heredoc_contents = @heredoc_content_tokens.join # SNIP: <<~΁ͷdedentॲཧΛׂѪ @minified_values << heredoc_contents @minified_values << (@string_quote == '`' ? '`' : '"') @heredoc_content_tokens.clear @in_heredoc = false IFSFEPDதͷτʔΫϯॲཧΛ༗ޮԽ IFSFEPDதͷτʔΫϯॲཧΛແޮԽ EFEFOUॲཧ͕ඞཁ͔ঢ়ଶΛ࣋ͨͤΔ IFSFEPD͸ແҹҎ֎ΫΥʔτ͕ͱ͓Γ IFSFEPDຊจͷτʔΫϯ஋ͷ഑ྻΛ݁߹

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͢΂ͯΛ෺ޠΔλΠτϧɻࠓճͷHFN͸IFSFEPD͕ਖ਼௚·ͩόΪʔ IUUQTTQFBLFSEFDLDPNZVJ@LOLIFSFEPDJOEFNPODBTUMF

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ࠓޙͷ֦ுʹ޲͚ͨ஫ҙ఺ def m(a) bar unless cond end def m(a)bar unless cond end w Ҿ਺Χοί͋Γͷɺվߦ΍ηϛίϩϯͳ͠Ͱॻ͚ΔFOE͋Γͷ ϫϯϥΠφʔϝιουఆٛʹ͍ͭͯߟ͑Δ ಉ͡ߏจ໦

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FOEMFTTEFGͱ͸ߏจ͕ҟͳΔ w .BOHMJOHΛߟ͑Δ৔߹͸-FYFSτʔΫϯΑΓ ߏจ໦Ͱͷॲཧ͕޲͍͍ͯΔ͔΋ def foo(a)=bar unless cond def foo(a)bar unless cond end ҟͳΔߏจ໦

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ެ։ ͜ΜͳࢥߟΛͭͭ͠Ͱ͖·ͨ͠

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# Original $ find . -name '*.rb' -type f -print0 | \ xargs -0 wc -c | awk 'END{print $1}' 49825 # Original $ find . -name '*.rb' -type f -print0 | \ xargs -0 wc -c | awk 'END{print $1}' 49825 # Minify $ bundle exec rake minify $ find . -name '*.rb' -type f -print0 | \ xargs -0 wc -c | awk 'END{print $1}' 31598 # Original $ find . -name '*.rb' -type f -print0 | \ xargs -0 wc -c | awk 'END{print $1}' 49825 # Minify $ bundle exec rake minify $ find . -name '*.rb' -type f -print0 | \ xargs -0 wc -c | awk 'END{print $1}' 31598 # Ratio $ ruby -e 'p 31598 / 49825.0' 0.6341796287004515 .JOJGZͰͲΕ͘Β͍ݮΔʁ

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w MJC͸ όΠτ͔Β όΠτʹͳΓɺ TQFD͸ όΠτ͔Β όΠτʹ ͳΔ w ͭ·Γ࡟ݮ͞Εͨίʔυ͸34QFDͷํ͕ߴ͍ w ࣮ફత ͱ͸ʁ ʹ͸ϓϩμΫτίʔυ΁ͷޮ Ռ͕ߴ͍ํ͕͍͍Μ͚ͩͲݱ࣮͸͜͏Β͍͠ ଌఆͱධՁΛ΋͏গ͠

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github.com/koic/minifyrb gem install minifyrbͰ༡ΜͰΈͯͶ

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͓΅͍͑ͯ·͔͢ʁ

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@koic w044ϓϩάϥϚʔ w3VCP$PQίΞνʔϜίϛολʔ wגࣜձࣾӬ࿨γεςϜϚωδϝϯτ &4. *OD ΤϯδχΞϦϯάϚωʔδϟʔ σΟεςΟϯάΠογϡυɾΤϯδχΞ

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One More Thing

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" ࠞಱͱடং

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.JOJGZͨ͠ίʔυͱ ΋ͬͱٔΕΔ

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w ೉ಡԽʹର͢Δ෮߸ԽΈ͍ͨͳ΋ͷ w ͓࢓ࣄʹݶΒͣɺ;ͩΜ͸ΈΜͳߦّͷྑ͍ ίʔυΛແҙࣝʹ໨ࢦͯ͠͠·͍·͢ΑͶʁ w 3VCP$PQͷΦʔτίϨΫτͱ͍͏ ϑΥʔϚολʔͷྗͷ࠶ൃݟ .JOJGZͰյͯ͠3VCP$PQͰ௚͢ .JOJGZͨ͠ίʔυ͕Ͳ͏෮ݩͰ͖Δ͔ڵຯΛ࣋ͪ·͢ΑͶʁ

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w .JOJGZͱ3VCP$PQͱ͍͏ࠞಱ͔Βͷ૑଄ w 3VCP$PQͷΤοδέʔεॲཧʹ͍ͭͯɺ NJOJGZͨ͠ίʔυΛݩʹ͢Ε͹؆୯ʹҧ൓͋ ΓͷίʔυΛ࡞ΕΔΑ͏ʹͳͬͨ w .JOJGZ͚ͩͰͳ͘3VCP$PQͷࣗಈमਖ਼όά ΋ݟ͚ͭͯ௚͢ػձʹͳ͍ͬͯΔ .JOJGZ։ൃͷࢥΘ͵෭࡞༻

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0SJHJOBM$PEF

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.JOJ fi FE$PEF

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"VUPDPSSFDUFE$PEF .JOJGZͷத֩ͷίʔυΛ.JOJGZͯ͠ɺͦͷ͋ͱ3VCP$PQͰϑΥʔϚοτ

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%&.0

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w ࠓճͷ෮߸ԽσϞͷͨΊʹ΋͍͔ͭ͘௚ͨ͠ w ;ͭ͏ਓ͸ॻ͔ͳ͍ϫϯϥΠφʔʹରͯ͠ɺ 3VCP$PQ͸࿬͕؁͍ ͦΕ͸ͦ͏ w .JOJGZ͸ແݶʹ໰୊ΛᖰΓग़ͨ͢Ίͷڰؾͷ ڟث͔΋͠Εͳ͍ ਓ͕ॻ͔ͳ͍ίʔυΛಘΔ ਓ͸৘ཧͰ͖Ε͍ͳίʔυΛॻ͜͏ͱ͢Δ͕ɺϓϩάϥϜ͸ࢦࣔ௨Γಈ͚ͩ͘

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PTSL@FGGFDU Ϛονϙϯϓͷ׬੒ .JOJGZΛ࡞ͬͨΒ3VCP$PQͷࣗಈमਖ਼ΫΦϦςΟ͕͕͋ͬͨ

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l ੒ख़ͨ͠จԽɺྫ͑͹ԻָͰ΋ָේΛٯ͞ʹͯ͠ ΋஄͘͜ͱ͕Ͱ͖ΔԻָͱ͔ͦ͏͍͏΋ͷ͕͋ͬ ͯɺ தུ ੒ख़ͨ͠จԽʹ͸͜͏͍͓ͬͨ༡ͼ ͕ൃల͍ͯͯ͠ɺϓϩάϥϛϯάͱ͍͏෼໺΋ ੒ख़ͨ͠จԽʹͳ͍ͬͯΔͱ͍͑ΔΜͰ͔͢Ͷ !LJOBCB TRICK 2018 (FINAL) ʹͯ

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Կͷ໾ʹ΋ཱͨͳ͍ ϓϩάϥϜΛָ͠ΉจԽ IUUQTXXXZPVUVCFDPNXBUDI W5#ON((VV