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Qiita / Qiita:Team における Markdown レンダリングの歴史
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Yuji Nakayama
August 29, 2017
Technology
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Qiita / Qiita:Team における Markdown レンダリングの歴史
Markdown Night 2017 Summer
https://connpass.com/event/63383/
Yuji Nakayama
August 29, 2017
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Transcript
2JJUB2JJUB5FBNʹ͓͚Δ .BSLEPXOϨϯμϦϯάͷྺ࢙ Yuji Nakayama @nkym37 @yujinakayama
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࠷ॳQ&AαʔϏεͩͬͨ
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࠷ॳ MarkdownະରԠͩͬͨ
ࠓ͢͜ͱ .BSLEPXOυΩϡϝϯτΛϗετ͢Δ8FCαʔϏεΛӡ Ӧ͢Δ্Ͱ໘͖ͯͨ͠ɺ.BSLEPXOϨϯμϥʔपΓͷ టष͍ࣄ
2JJUBͷॳظͷ.BSLEPXOαϙʔτ ݄ 2JJUBϦϦʔεͷϲ݄ޙ
ॳظͷ2JJUBͷ.BSLEPXOϨϯμϥʔ w ࣮SFEDBSQFU ΧελϜϨϯμϥʔ w SFEDBSQFU$Ͱॻ͔Εͨ.BSLEPXOύʔαʔͷSVCZHFN w ࣌ͷ(JU)VC'MBWPSFE.BSLEPXOͷ࣮SFEDBSQFUͷ ϕʔεͰ͋ΔTVOEPXOΛϕʔεʹ͍ͯͨ͠ʢͱࢥΘΕΔʣ w
·ͩ$PNNPO.BSLͳ͔ͬͨ
class Qiita::Markdown::Renderer < Redcarpet::Render::HTML # ... end renderer = Qiita::Markdown::Renderer(
filter_html: true, hard_wrap: true ) parser = Redcarpet::Markdown.new( renderer, autolink: true, fenced_code_blocks: true ) html = parser.render(markdown)
ॳظͷ༷ w ༷తʹ(JU)VC'MBWPSFE.BSLEPXOʹد͍ͤͯͨ w BVUPMJOL63-ͬΆ͍จࣈྻΛࣗಈͰϦϯΫʹ w GFODFE@DPEF@CMPDLT```\nsome code\n``` w IBSE@XSBQ.BSLEPXOͷվߦͰ<br>ग़ྗ
w ΧελϜϨϯμϥʔͰγϯλοΫεϋΠϥΠτ w ͷͪʹଧͪফ͠ઢςʔϒϧه๏ʹରԠ
ϝϯγϣϯه๏ͷಋೖ ݄ @username
2JJUB5FBNϦϦʔε ݄ αχλΠζͷϧʔϧ͕2JJUBͱएׯҟͳΔ
ֆจࣈͷαϙʔτ ݄ :tada:
qiita-markdown gem ݄
qiita-markdown gem w IUNMQJQFMJOF SFEDBSQFU OPLPHJSJ w IUNMQJQFMJOF)5.-ॲཧͷ3VCZϑϨʔϜϫʔΫ w ίΞϨϯμϥʔͱͯ͠SFEDBSQFUΛ͍ɺͦͷग़ྗʹର͠
ͯෳͷϑΟϧλʔʹΑΔޙॲཧΛద༻ w 044Խ
Redcarpet filter Emoji filter Syntax highlight filter Mention filter Markdown
string HTML tree HTML tree HTML tree HTML tree HTML tree HTML tree HTML tree
IUNMQJQFMJOFͷԿ͕خ͍͔͠ w ͝ͱʹϑΟϧλʔΛ͚ΒΕΔͷͰɺίʔυͷݟ௨͕͠ྑ͘ͳΔ w ϑΟϧλʔͷద༻ॱং͕໌֬ w جຊσʔλߏͱͯ͠OPLPHJSJͷ)5.-USFFΛ࠾༻͍ͯ͠ΔͨΊ )5.-ͷૢ࡞͕ݎ࿚ w ҎલͷϨϯμϥʔͰҰ෦ਖ਼نදݱΛ͍ͬͯΔՕॴ͕͋ͬͨ
ϢʔβʔͷաڈͷίϝϯτҰཡ ݄
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ίϝϯτҰཡΛදࣔ͢Δ w هࣄҰཡͳΒλΠτϧΛදࣔ͢Εྑ͍͕ɺίϝϯτʹ λΠτϧ͕ͳ͍ͷͰɺຊจͷཁΛදࣔ͢Δඞཁ͕͋Δ w ͗͢ΔίϝϯτશจΛදࣔͨ͘͠ͳ͍ w ཁͱͯ͠දࣔ͢Δͷ͕͍͠ɺෳࡶͳϚʔΫΞοϓΛऔ Γআ͖͍ͨ
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Qiita::Markdown::SummaryProcessor w ϒϩοΫཁૉͷதͭͭ͠λάΛআ͢Δ͜ͱͰɺΠϯϥΠϯԽ •<p>foo<em>bar</em></p>ˠfoo<em>bar</em> w ςʔϒϧͷΑ͏ͳɺΠϯϥΠϯԽͯ͠ෳࡶ͗ͯ͢ҙຯΛͳ͞ͳ͍ཁ ૉத͝ͱআ w )5.-ͷυΩϡϝϯτߏΛߟྀͭͭ͠USVODBUF
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ϝϯγϣϯͰ͖ͳ͍Ϣʔβʔ ݄
ϝϯγϣϯͰ͖ͳ͍ਓ͕͍ΔΜͰ͕͢ʜ
@qiitan Markdown HTML <a href="/qiitan">@qiitan</a> @<strong>gfx</strong> @__gfx__ <em> Hi <a
href="/foo">@foo</a> </em> _Hi @foo_
w__foo__Λ<strong>foo</strong>ʹม͢Δॲཧ SFEDBSQFU͕͍ͬͯΔ w@fooΛ<a href="/foo">@foo</a>ʹม͢Δॲཧɺ SFEDBSQFUΑΓޙఔͷ.FOUJPOϑΟϧλʔ͕͍ͬͯΔ wͭ·Γ.FOUJPOϑΟϧλʔͷೖྗͷ࣌Ͱɺ@__gfx__ @<strong>gfx</strong>ʹͳͬͯ͠·͍ͬͯΔ
Redcarpet filter Mention filter @__gfx__ @<strong>gfx</strong> @<strong>gfx</strong> ͳΜ͔<strong>λά͍ͭͯΔ͠ ͜Εϝϯγϣϯ͡Όͳ͍ͳ ͳΜ͔ઌ಄ʹ@͍ͭͯΔ͚Ͳ
ڧௐه๏ʹϚον͢Δ͔Βڧௐ͠ͱ͜
w ࠜຊతʹ͜ͷʹରॲ͢ΔʹɺSFEDBSQFUʹखΛՃ͑ͯϝϯγϣϯه๏ ͷࣝΛ༩͑ΔʢϝϯγϣϯͷҰ෦ͩͬͨΒڧௐ͠ͳ͍ʣඞཁ͕͋Δ w ͔͠͠SFEDBSQFUͷGPSL࠷ऴखஈͰ͋ΓɺͰ͖ΕΓͨ͘ͳ͍ w ϫʔΫΞϥϯυͱͯ͠ɺ.FOUJPOϑΟϧλʔʹ@<strong>gfx</ strong>͕͞ΕͨΒɺ@__gfx__ʹͯ͠ϝϯγϣϯͱͯ͠ѻ͑ྑ͍ʁ w ڧௐه๏_͚ͩͰͳ͘*͑ΔͷͰ@<strong>gfx</strong>ͷݩ
ͷ.BSLEPXOιʔε͕ɺ@**gfx**ͩͬͨՄೳੑ͋Δ
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(JU)VC͜ͷʹ Ͳ͏ରॲ͍ͯ͠Δͷ͔
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.BSLEPXOͰϝϯγϣϯͰ͖ΔαʔϏεΛ࡞ΔͳΒɺ Ϣʔβʔ໊ʹ_Λ͑ͳ͍Α͏ʹͨ͠ํ͕ྑ͍ গͳ͘ͱઌ಄ͱඌͷ_ආ͚͍ͨ
ݹ͍Ωϟογϡ ݄
.BSLEPXOϨϯμϦϯάͷύϑΥʔϚϯε w 8FCαʔϏεͱͯ͠ɺϢʔβʔʹͱͬͯշదͳϨεϙϯελΠ ϜΛୡ͢Δͱ͍͏จ຺Ͱɺ.BSLEPXO RJJUBNBSLEPXO ͷ ϨϯμϦϯάॏ͍ w ຊจͷ༰͞ʹΑͬͯॲཧ͕࣌ؒେ͖͘มΘΔ w
ڊେͳςʔϒϧΛؚΜͩهࣄɺϨϯμϦϯάʹඵ͔͔ۙ͘ Δ͜ͱ͋Δ
ϨϯμϦϯά݁ՌΛΩϟογϡ͢Δ w ߘ࣌ʹҰ͚ͩϨϯμϦϯάͯ͠ɺ݁ՌΛΩϟογϡ ͓ͯ͘͠ w هࣄϖʔδӾཡϦΫΤετʹରͯ͠ຖճϨϯμϦϯά ͠ͳ͍
ݹ͍Ωϟογϡ w RJJUBNBSLEPXOʑਐԽ͍ͯ͠ΔͨΊɺߘ࣌ʹΩϟο γϡ͞ΕͨϨϯμϦϯά݁Ռͱɺ࠷৽ͷϨϯμϥʔͰϨϯ μϦϯάͨ͠߹ͷ݁Ռʹဃ͕ͰΔ w ࠣࡉͳมߋͰ͋Εݹ͍ΩϟογϡΛࢀর͠ଓ͚ͯྑ͍ ͕ɺ944ͳͲͷ੬ऑੑରԠͷ߹৽͍͠ϨϯμϥʔͰ֬ ࣮ʹϨϯμϦϯά͍ͨ͠͠
࠶ϨϯμϦϯάػߏ w *ODSFNFOUBMͳSFOEFSFSWFSTJPO *OUFHFS Λఆٛ͢Δ w ϨϯμϦϯά݁ՌͷΩϟογϡʹɺͦͷ࣌ͰͷSFOEFSFSWFSTJPOΛҰॹʹ֨ೲ͓ͯ͘͠ w هࣄΫϥεͷϨϯμϦϯά݁ՌΛฦ͢ϝιουͰɺΩϟογϡͷSFOEFSFSWFSTJPO͕ݱ ࡏͷWFSTJPOΑΓݹ͍߹ࣗಈతʹ࠶ϨϯμϦϯάΛ࣮ߦ͢Δ
w ࣮ࡍʹશϦΫΤετͰ࠶ϨϯμϦϯά͕Δͱෛՙͷ͕͋ΔͷͰɺ֬తʹ࣮ ߦ͞ΕΔΑ͏ʹ͠ɺ࣌ؒͱڞʹΛঃʑʹ্͍͛ͯ͘ w RJJUBNBSLEPXOʹखΛՃ͑ͨ߹ɺԿΒ͔ͷཧ༝Ͱશهࣄͷ࠶ϨϯμϦϯάΛ࣮ߦ͠ ͍ͨ߹SFOEFSFSWFSTJPOΛ ͢Δ
class Article < ActiveRecord::Base CURRENT_RENDERER_VERSION = 3 def rendered_body if
cached_body_renderer_version < CURRENT_RENDERER_VERSION self.cached_body = render(markdown_body) self.cached_body_renderer_version = CURRENT_RENDERER_VERSION end cached_body end end
݄
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.BSLEPXO)5.-λάΛೖྗͰ͖Δ ໌Β͔ʹةݥͳλάଐੑαχλΠζ͍͕ͯͨ͠ɺ DMBTTଐੑڐՄ͍ͯͨ͠ <span class="fa fa-spin"> ·ΘΔίϝϯτ </span>
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ΑΓݫ֨ͳαχλΠζ w 2JJUBͷ6*ʹΘΕ͍ͯΔDMBTTΛࢦఆ͢Δ͜ͱͰɺ2JJUBΛ฿ͨ͠ϑΟογϯάϖʔδΛ࡞ Ͱ͖ͯ͠·͏ w FH2JJUBͷϩάΠϯϖʔδΛ฿ͨ͠ϑΥʔϜΛ࡞Γɺ֎෦αΠτύεϫʔυΛૹ৴͢Δ w ͜Ε·ͰαχλΠζ͍͕ͯͨ͠ɺϗϫΠτϦετϧʔϧΛΑΓݫ֨ʹ͠ɺར༻Ͱ͖Δ )5.-ཁૉଐੑΛݶఆతʹͨ͠ w
HSFFONBU SFEDBSQFU ʹ͓͍ͯɺதؒϝλσʔλΛDMBTTଐੑͱͯ͠ग़ྗ͍ͯ͠ΔՕॴ͕͋ͬ ͨͷͰɺผͷEBUB ଐੑʹग़ྗ͢ΔΑ͏ʹมߋ͠ɺϢʔβʔʹΑΔೖྗͱ۠ผͰ͖ΔΑ͏ ʹͨ͠
͜Ε͔Β
$PNNPO.BSLʁ w ظతʹҠߦ͍ͨ͠ʢݸਓͷײʣ͕ɺطଘͷهࣄσʔ λͷҠߦ͕େมͦ͏ w (JU)VC$PNNPO.BSLͷҠߦ࣌ɺ৽چͷϨϯμϥʔͰ ղऍ͕ҟͳΔυΩϡϝϯτมॲஔΛߦͳͬͨ w IUUQTHJUIVCFOHJOFFSJOHDPNBGPSNBMTQFDGPS HJUIVCNBSLEPXO
Thank you