Goで軽量マークアップ言語のパーサーを書く / Writing a parser with Go

by aereal

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GoͰܰྔϚʔΫΞοϓݴޠ ͷύʔαʔΛॻ͘ id:aereal

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ܰྔϚʔΫΞοϓݴޠͱ͸ • ҎԼ LML = Lightweight Markup Language • HTML΍XMLͱϓϨʔϯςΩετͷதؒ • Markdown, Textile, ͸ͯͳه๏, etc.

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ܰྔϚʔΫΞοϓݴޠͱ͸ • ҎԼ LML = Lightweight Markup Language • HTML΍XMLͱϓϨʔϯςΩετͷதؒ • Markdown, Textile, ͸ͯͳه๏, etc.

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GoͰ͸ͯͳه๏ͷ ύʔαʔΛॻ͘ id:aereal

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ࣗݾ঺հ • id:aereal • Twitter: aereal • GitHub: aereal • גࣜձࣾ͸ͯͳ  ΞϓϦέʔγϣϯΤϯδχΞ

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!͓͜ͱΘΓ! • ࠓճ঺հ͢Δ͸ͯͳه๏ύʔαʔ͸  ϓϥΠϕʔτϫʔΫͰ͢ • ͸ͯͳͷαʔϏεʹ࠾༻͞ΕΔ͔ͳͲ͸  ͢΂ͯະఆͰ͢

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ࢀߟ৘ใ • ͜ͷࢿྉͰ঺հ͢Δ৘ใ͸͢΂ͯ 2017gokyoto ͱ ͍͏λάΛ͚ͭͯϒοΫϚʔΫ͍ͯ͠·͢ • http://b.hatena.ne.jp/aereal/2017gokyoto/

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͸ͯͳه๏ͱ͸ • ͸ͯͳ͕ఏڙ͢ΔαʔϏεͷҰ෦Ͱ࢖͑ΔLML • ͸ͯͳϒϩάɺ͸ͯͳμΠΞϦʔ • org-modeͱͪΐͬͱࣅ͍ͯΔ

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͸ͯͳه๏ͷྫ * ݟग़͠1 ** ݟग़͠2 - Ruby - Perl - Go + ى + ঝ + స + ݁

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ͳͥύʔαʔΛॻ͘? • طʹಈ͍͍ͯΔ΋ͷʹखΛՃ͑ΔͷͰ͸μϝ? • ͳͥ͸ͯͳه๏? • ͳͥGoͰ?

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Ϟνϕʔγϣϯ • طଘͷ࣮૷ʹखΛՃ͑Δͷ͸Ή͔͍ͣ͠ • ͸ͯͳه๏Λύʔε͍ͨ͠χʔζ͸͋Δ! • Go͕ॻ͖͔ͨͬͨ

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طଘͷ࣮૷ʹखΛՃ͑Δͷ͸ Ή͔͍ͣ͠ • ܗࣜతͳఆ͕ٛͳ͍ = ಈ͘ίʔυ͕࢓༷ • ਖ਼نදݱ

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͸ͯͳه๏Λύʔε͍ͨ͠ χʔζ͸͋Δ! • ͸ͯͳάϧʔϓͰීஈ͔Βॻ͍͍ͯΔ • ͸ͯͳϒϩάͰ೔هΛॻ͘ͷ͕झຯ • →͸ͯͳه๏ʹ೔ৗతʹ৮Ε͍ͯΔ • Markdown΁ͷม׵ (...)

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Go͕ॻ͖͔ͨͬͨ • ීஈ͸Perl΍JavaScriptɺͨ·ʹScala • ۀ຿ͱҟͳΔίϯςΩετͰίʔυΛॻ͖͔ͨͬͨ

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ͪΐ͏Ͳ͍͍໨ඪ • Ͱ͖Δ͜ͱɺ΍Γ͍ͨ͜ͱɺؔ৺ͷ͋Δ͜ͱ͕  ͍͍͔Μ͡ʹόϥϯε͞Ε͍ͯΔ • WebͱςΩετϓϩηογϯά • খ໨ඪΛੵΈॏͶ͍͚ͯΔ • ʮࠓ೔͸͜ͷه๏Λ௥Ճ͠Α͏ʯ

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108͋Δ͸ͯͳه๏ύʔαʔ • ͸ͯͳμΠΞϦʔ • ͸ͯͳάϧʔϓ • Text-Hatena (CPAN) • Text-Xatena • chris4403/WikiTextConverter • ...

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108͋Δ͸ͯͳه๏ύʔαʔ • ͦΕͧΕඍົʹ࢓༷͕ҟͳΔ • ৽͘͠࡞ΒΕͨ΋ͷ΄ͲεʔύʔηοτͷఆٛΛ  ࢼΈΔ܏޲͕͋Δ

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ܗࣜతͳఆٛΛ༩͍͑ͨ • ࣮૷ͱఆٛΛૄʹ͍ͨ͠ • ఆ͚ٛͩΛࢀর͍ͨ͠ • ͤΊͯCommonMark͘Β͍ͷ΋ͷ͸…… • (ͱ͸͍࣮͑૷ͱϦϯΫͤ͞ΒΕΔ΄͏͕Α͍)

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aereal/go-text-hatena https://github.com/aereal/go-text-hatena

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࣮૷ͨ͠ه๏ • ݟग़͠ • Ϧετ • Ҿ༻ • HTTPه๏ (Ұ෦)

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໨ࢦ͢ͱ͜Ζ • ϙʔλϒϧͰ͋Δ͜ͱ • ݴޠʹґΒͣར༻Ͱ͖Δ • ར༻ऀ͕೚ҙͷHTMLม׵ϧʔϧΛద༻Ͱ͖Δ • ࣮૷ͱఆٛΛૄʹ • ఆٛΛ੩తʹࢀরͰ͖Δ • ࣮૷ݴޠ (Go) ͷ஌͕ࣝͳͯ͘΋งғؾ͸௫ΊΔ

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࣮૷ • GoͰೖग़ྗΛΠϯλʔϑΣʔεͱ͢ΔόΠφϦ • → ݴޠʹґΒͣར༻Ͱ͖Δ • ASTΛJSONͰग़ྗ͢Δ͚ͩ • → ར༻ऀ͕೚ҙͷHTMLม׵ϧʔϧΛద༻ (࣮૷) Ͱ͖Δ

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࣮૷ • goyaccΛ࢖͍YACCͰจ๏ఆٛ • → ఆٛΛ੩తʹࢀরͰ͖Δ (parser.go.y) • ࣮૷ݴޠ (Go) ͷ஌͕ࣝͳͯ͘΋งғؾ͸௫ΊΔ

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HTML΁ͷม׵ • αʔϏεʹΑͬͯͲΕ͘Β͍HTMLͷೖྗΛ  ڐ༰͢Δ͔ͷํ਑͕ҟͳΔ • ͸ͯͳϒϩά͸ࣗ༝͕ͩɺ͸ͯͳμΠΞϦʔ͸  ϗϫΠτϦετܗࣜ • ηΩϡϦςΟ্ͷࣄ৘

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ม׵σϞ • aereal/sketch-hatena-notation-api

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GoͰύʔαʔΛॻ͘

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࢖ͬͨπʔϧ • Go • goyacc • text/scanner

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goyacc • yaccͷGo൛ • ࠷ۙ go tool ͔Β֎Εͨ • go get golang.org/x/tools/cmd/goyacc

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yacc • ύʔαʔδΣωϨʔλʔ • BNF • ఆٛʹରͯ͠ίʔϧόοΫΛॻ͍͍ͯ͘ • ؐݩͱΞΫγϣϯͱݺ͹ΕΔ • ଎शyacc͕͓͢͢Ί • ࣮૷ྫͱͯ͠ mattn/streeem ΋ࢀߟʹͳΔ

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yaccͷ͍͍ͱ͜Ζ • BNFʹΑΔఆٛͱɺؐݩ͢Δίʔυ͕෼཭Ͱ͖Δ • ݴޠ಺DSLΛ࢖͏ύʔαʔίϯϏωʔλʔΑΓ  ଞͷਓʹݺΜͰ΋Β͍΍͍͢ؾ͕͢Δ

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yaccͷඍົͳͱ͜Ζ • *.go.y ͰΤσΟλͷࢧԉ͕ड͚ΒΕͳ͍ • ͏·͍͜ͱઃఆͨ͠ΒͰ͖ͦ͏Ͱ͸͋Δ • ࣈ۟ղੳ͸ࣗ෼ͰؤுΔඞཁ͕͋Δ • GoͰ͸ text/scanner ͱ͍͏ඪ४ϥΠϒϥϦ͕  ͋ΔͷͰָͰ͖Δ

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ίʔυΛಡΜͰΈΔ • lex.go • parser.go.y • parser_test.go

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·ͱΊ

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·ͱΊ • ͸ͯͳه๏ύʔαʔΛGoͰॻ͍ͨ • Goʹ͸goyacc΍text/scannerͳͲ  ߏจղੳ΍ࣈ۟ղੳͷͨΊͷπʔϧ͕ἧ͍ͬͯΔ

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ࢀߟ৘ใ • ͜ͷࢿྉͰ঺հ͢Δ৘ใ͸͢΂ͯ 2017gokyoto ͱ ͍͏λάΛ͚ͭͯϒοΫϚʔΫ͍ͯ͠·͢ • http://b.hatena.ne.jp/aereal/2017gokyoto/