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cpanfile が Ruby でパースできることに気づいた俺たちは
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Takafumi ONAKA
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September 08, 2018
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87
cpanfile が Ruby でパースできることに気づいた俺たちは
2018-09-08 builderscon tokyo 2018
初出:
https://www.slideshare.net/takafumionaka/cpanfileruby
Takafumi ONAKA
PRO
September 08, 2018
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Transcript
DQBOpMF͕3VCZͰύʔεͰ͖Δ ͜ͱʹؾ͍ͮͨԶͨͪ CVJMEFSTDPOUPLZP େೳ࢙BLBJEPOL
ࣗݾհ w େೳ࢙BLBJEPOL w ͯͳͱ͍͏ձࣾͰɺ1FSMΛॻ͍͍ͯ·͢ɻ ژ͔Βདྷ·ͨ͠ w ࠓͷ݄·Ͱલ৬Ͱ3VCZΛॻ͍͍ͯ·ͨ͠ɻ 3VCZྺ͙Β͍
લճͷϥʂ
1FSM͍ͷࠃͷ3VCZJTU w
1FSM͔Β3VCZ w
ࠓͷ
DQBOpMFΛ requires 'Plack'; ... on test => sub { requires
'Test2', '1.302138'; ... }
DQBOpMFΛ3VCZͰʜʜʁ $ ruby -cw cpanfile Syntax OK
͍ͭ͜ʜʜಈͧ͘ʜʜʂ
ͱ͍͏Ͱ͢ w ΑΖ͓͘͠ئ͍͠·͢
DQBOpMFͱ
DQBOpMFͱ w ϓϩδΣΫτͰ͏$1"/ϞδϡʔϧͷҰཡΛॻ͘ͷ w 3VCZͰ͍͏(FNpMF HFNpMFSC
DQBOpMFͷTZOUBY # requires Ͱ ͍͍ͨ CPAN Module ΛฒΔ requires 'Plack';
... # ಛఆͷ env ͰͷΈ͍͍ͨͷ on <ENV> Ͱ sub Λ͢ on test => sub { # ୈ2ҾͰόʔδϣϯݻఆ͍ͯ͠Δ߹͋Δ requires 'Test2', '1.302138'; ... }
DQBOpMFͷTZOUBY w 3VCZతʹ͜ͷDQBOpMFͲͷΑ͏ʹύʔε͞ΕΔ͔ w ৄ͘͠SVCZEVNQQBSTFUSFFDQBOpMFΛ࣮ߦ
DQBOpMFͷTZOUBYJO3VCZ w ͜ͷߦ3VCZͰಈ͘͜ͱ͕໌ന w SFRVJSFTϝιουʹจࣈྻͷҾΛ͍ͯ͠Δ w ߦͷηϛίϩϯ͕͋ͬͯͳ͍ requires 'Plack';
DQBOpMFͷTZOUBYJO3VCZ w ίον w ͜ΕΛ͏ͪΐͬͱ͚ͩΧοίΛิ͢Δͱ on test => sub {
requires 'Test2', '1.302138'; }
DQBOpMFͷTZOUBYJO3VCZ w ίον w ͜ΕΛ͏ͪΐͬͱ͚ͩΧοίΛิ͢Δͱ on({ test => sub {
requires 'Test2', '1.302138'; } })
DQBOpMFͷTZOUBYJO3VCZ w POϝιουʹϋογϡΛ͍ͯ͠Δ on({ test => sub { requires 'Test2',
'1.302138'; } })
DQBOpMFͷTZOUBYJO3VCZ w ϋογϡͷΩʔUFTUϝιου on({ test => sub { requires 'Test2',
'1.302138'; } })
DQBOpMFͷTZOUBYJO3VCZ w ϋογϡͷΩʔUFTUϝιου w ϋογϡͷόϦϡʔTVCϝιουʹϒϩοΫΛͨ͠ͷ on({ test => sub {
requires 'Test2', '1.302138'; } })
DQBOpMFͷTZOUBYJO3VCZ w ϋογϡͷΩʔUFTUϝιου w ϋογϡͷόϦϡʔTVCϝιουʹϒϩοΫΛͨ͠ͷ w ϒϩοΫͷதSFRVJSFTϝιουʹҾΛͨ͠ͷ on({ test =>
sub { requires 'Test2', '1.302138'; } })
DQBOpMFͷTZOUBYJO3VCZ w ͜͜·Ͱ͔ΕධՁͰ͖Δʂʂʂʂʂʂʁ on({ test => sub { requires 'Test2',
'1.302138'; } })
3VCZͰDQBOpMFΛධՁ͢Δ
3VCZͰDQBOpMFΛධՁ͢Δ w SFRVJSFTPSҾΛड͚औΔϝιου requires ‘Plack'; requires 'Test2', '1.302138';
3VCZͰDQBOpMFΛධՁ͢Δ w SFRVJSFTPSҾΛड͚औΔϝιου w ͱΓ͋͑ͣͲΜͳϞδϡʔϧΛ͍͍͔͔ͨΔΑ͏ʹɺΠϯελ ϯεมʹͰ٧Ί͓ͯ͜͏ @requires = [] def
requires(module_name, version = nil) @requires << [module_name, version] end
3VCZͰDQBOpMFΛධՁ͢Δ w POϋογϡΛҾʹऔΔϝιου on({ test => sub { requires 'Test2',
'1.302138'; } })
3VCZͰDQBOpMFΛධՁ͢Δ w POϋογϡΛҾʹऔΔϝιου w ͱΓࣺ͋͑ͣͯΕ͍͍͔ͳɻɻ w ͋ͱͰ͏Α͏ʹվળ͠·͢ ޙड़ def on(_hash)
# nop end
3VCZͰDQBOpMFΛධՁ͢Δ w UFTUϋογϡͷΩʔ on({ test => sub { requires 'Test2',
'1.302138'; } })
3VCZͰDQBOpMFΛධՁ͢Δ w UFTUϋογϡͷΩʔ w ͳͷͰɺจࣈྻͷlUFTUzͰฦ͓͚ͯ͠ྑ͍ w Կฦ͞ͳͯ͘OJM͕ΩʔʹͳΔ͚ͩͰ͢ def test "test"
end
3VCZͰDQBOpMFΛධՁ͢Δ w TVCϒϩοΫΛड͚औΔϝιου on({ test => sub { requires 'Test2',
'1.302138'; } })
3VCZͰDQBOpMFΛධՁ͢Δ w TVCϒϩοΫΛड͚औΔϝιου w ZJFME͠·͢ def sub yield end
3VCZͰDQBOpMFΛධՁ͢Δ w TVCϒϩοΫΛड͚औΔϝιου w ZJFME͠·͢ w ༨ஊ POΛ༗ޮʹ͏ͨΊʹԆධՁͤ͞ΔͷͰMBNCEBͰแΉ def sub
-> { yield } end def on(hash) hash.each do |env, sub| sub.call end end
3VCZͰDQBOpMFΛධՁ͢Δ w ͋ͱ࣮ߦ͢Δ͚ͩʂʂʂ w σϞ eval File.read("./cpanfile") pp @requires
3VCZͰDQBOpMFΛධՁ͢Δ w ͋ͱ࣮ߦ͢Δ͚ͩʂʂʂ $ ruby cpanfile_parser.rb [["Plack", nil], ["Test2", "1.302138"]]
DQBOpMFΛධՁͰ͖ΔͱԿ ͕Ͱ͖Δ͔
DQBOpMFΛධՁͰ͖ΔͱԿ͕Ͱ͖Δ͔ w %FQFOEBCPUΛ࡞Δ͜ͱ͕Ͱ͖Δ w ϓϩδΣΫτ͕ґଘ͍ͯ͠ΔϥΠϒϥϦͷҰཡදࣔ w ࠷৽όʔδϣϯΑΓݹ͍όʔδϣϯͰݻఆ͍ͯͨ͠ΒܯࠂΛग़͢
DQBOpMFΛධՁͰ͖ΔͱԿ͕Ͱ͖Δ͔ w %FQFOEBCPUΛ࡞Δ͜ͱ͕Ͱ͖Δ w ϓϩδΣΫτ͕ґଘ͍ͯ͠ΔϥΠϒϥϦͷҰཡදࣔ w ࠷৽όʔδϣϯΑΓݹ͍όʔδϣϯͰݻఆ͍ͯͨ͠ΒܯࠂΛग़͢ w ͱ͍͏Θ͚Ͱ࡞Γ·ͨ͠ EFNP
DQBOpMFΛධՁͰ͖ΔͱԿ͕Ͱ͖Δ͔
ఆ2"
21FSM͡Όμϝͩͬͨͷ w μϝͳΘ͚͕ͳ͍ w ໘നશ෦Ͱ3VCZͰ࣮͠·ͨ͠
ͯͳͰ1FSMϓϩάϥϜʹ3VCZͰ4ZOUBY $IFDLΛࢼͯ͠ΈΔΤϯδχΞืू͍ͯ͠·͢