Heredoc In Demon Castle

Transcript

1. ѱຐͷ৓ͷώΞυΩϡϝϯτ
   ۚࢠ༤Ұ࿠(@yui-knk)
   2018/07/14
   Rails Developers Meetup 2018 Day 3 Extreme
   

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2. Thank you !!
   

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3. ࣗݾ঺հ
   • ۚࢠ ༤Ұ࿠
   
   • Treasure Data ॴଐ
   
   • APIνʔϜ (RailsΞϓϦΛॻ͍͍ͯ·͢)
   
   • CRuby Committer 2015/12~
   
   • GitHub (yui-knk)
   

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4. "1*νʔϜ 3BJMTΞϓϦΛॻ͍
   ͍ͯ·͢
   
   

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5. https://www.treasuredata.com/company/careers/jobs/?team=Engineering
   

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8. Rubyͷ࿩Λ͠Α͏
   

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9. ࠓ೔ͷτϐοΫ
   • Ruby 2.6ͷ࿩
   
   • ѱຐͷ৓ͷ࿩
   
   • RubyͷώΞυΩϡϝϯτ
   
   • parser͔ΒΈͨώΞυΩϡϝϯτ
   

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10. ࠓ೔ͷτϐοΫ
    • Ruby 2.6ͷ࿩
    
    • ѱຐͷ৓ͷ࿩
    
    • RubyͷώΞυΩϡϝϯτ
    
    • parser͔ΒΈͨώΞυΩϡϝϯτ
    
    • Railsͷ࿩͸ͳ͍Ͱ͢
    

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11. ࠓ೔ͷ໨ඪ
    • RubyͷώΞυΩϡϝϯτʹ͍ͭͯཧղΛਂΊΔ
    
    • parserʹڵຯΛ΋ͭ
    

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12. Ruby 2.6ͷ࿩
    

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13. 3VCZQSFWJFX
    • 2018/05/31 ϦϦʔε
    
    • JIT
    
    • RubyVM::AST
    

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14. 3VCZ7."45
    • ΋ͱ΋ͱRubyʹ͸ `--dump=parsetree` ͱ͍͏Φϓγϣϯ
    ͕͋Δ
    
    • Rubyͷ಺෦తͳσʔλΛDump͢Δ΋ͷ
    

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15. $ ruby --dump=p -e '1 + 2'
    ###########################################################
    ## Do NOT use this node dump for any purpose other than ##
    ## debug and research. Compatibility is not guaranteed. ##
    ###########################################################
    # @ NODE_SCOPE (line: 1, location: (1,0)-(1,5))
    # +- nd_tbl: (empty)
    # +- nd_args:
    # | (null node)
    # +- nd_body:
    # @ NODE_OPCALL (line: 1, location: (1,0)-(1,5))*
    # +- nd_mid: :+
    # +- nd_recv:
    # | @ NODE_LIT (line: 1, location: (1,0)-(1,1))
    # | +- nd_lit: 1
    # +- nd_args:
    # @ NODE_ARRAY (line: 1, location: (1,4)-(1,5))
    # +- nd_alen: 1
    # +- nd_head:
    # | @ NODE_LIT (line: 1, location: (1,4)-(1,5))
    # | +- nd_lit: 2
    # +- nd_next:
    # (null node)
    

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16. 3VCZ7."45
    • ಺෦తͳσʔλΛRubyͷੈքͰѻ͑ΔΑ͏ʹ͢Δ΋ͷ
    
    • Ruby 2.6͔Βಋೖ͞ΕΔ༧ఆ
    
    • ಛʹ require ͳͲ͸ෆཁ
    
    • ASTͷߏ଄ʹ͍ͭͯ͸ޓ׵ੑ͕อূ͞Εͳ͍
    

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17. 3VCZ7."45
    RubyVM::AST.parse("1 + 2")
    # => #
    RubyVM::AST.parse("1 + 2").children[1].children
    # => [
    # #,
    # #
    # ]
    

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18. 3VCZUSVOL
    • Syntax Error͕ग़ΔΑ͏ʹमਖ਼͞Εͨ
    
    • #children ͕֦ு͞Εͨ
    

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19. 4ZOUBY&SSPS
    $ ruby -e 'RubyVM::AST.parse("1 + ")'
    Traceback (most recent call last):
    1: from -e:1:in `'
    -e:1:in `parse': no file name:1: syntax error,
    unexpected end-of-input (SyntaxError)
    

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20. DIJMESFO
    # 2.6.0-preview2
    RubyVM::AST.parse("1 + 2").children[1].children
    # => [
    # #,
    # #
    # ]
    # trunk
    RubyVM::AST.parse("1 + 2").children[2].children
    # => [
    # #,
    # :+,
    # #
    # ]
    mid
    

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21. DIJMESFO
    # trunk
    RubyVM::AST.parse("def a; end").children[2].children
    # => [
    # :a,
    # #
    # ]
    

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22. *OTUBMM
    $ rbenv install 2.6.0-dev
    

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23. ѱຐͷ৓ͷ࿩
    

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24. ͋Δ͍͸ͳͥࠓ೔ώΞυΩϡ
    ϝϯτͷ࿩Λ͢Δ͔
    

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25. ѱຐ৓
    • ѱຐ৓ parse.y ͱ͍ΘΕΔϑΝΠϧ͕͋Δ
    
    • https://slide.rabbit-shocker.org/authors/nobu/
    rubykaigi-2017/
    
    • parse.y ͸Rubyͷจ๏Λఆ͍ٛͯ͠ΔϑΝΠϧ
    
    • Bison ͱ͍͏πʔϧͰ Cݴޠͷίʔυʹม׵͢Δ
    op : '|' { ifndef_ripper($$ = '|'); }
    | '^' { ifndef_ripper($$ = '^'); }
    | '&' { ifndef_ripper($$ = '&'); }
    

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26. QBSTFZ
    $ git shortlog -s -n parse.y | head -10
    912 nobu
    362 matz
    140 mame
    91 yui-knk
    55 ko1
    38 aamine
    37 akr
    33 naruse
    25 usa
    8 normal
    

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27. ͳͥѱຐ৓ʁ
    • Large file (10000ߦҎ্͋Δ)
    
    • ripper standard library ͱϑΝΠϧΛڞ༗͍ͯ͠Δ
    
    • “#ifdef RIPPER” macro
    
    • stateful lexer
    
    • here document
    

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28. Ґஔ৘ใ
    # trunk
    RubyVM::AST.parse("1 + 2").children[2].children
    # => [
    # #,
    # :+,
    # #
    # ]
    

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29. https://rubykaigi.org/2018/presentations/spikeolaf.html#jun01
    

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30. https://twitter.com/tagomoris/status/1005018203313979392
    

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31. https://twitter.com/n0kada/status/1005030519334006785
    

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32. https://twitter.com/n0kada/status/1005030519334006785
    proc do<͜͜͸endͷޙ
    S
    

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33. 3VCZJTU)PUMJOLT
    ʲୈճʳ
    def foo; <In foo!
    bar
    In baz!
    quux
    p foo
    # => " In foo!\n"
    p baz
    # => " In baz!\n"
    https://magazine.rubyist.net/articles/0042/0042-Hotlinks.html#ruby
    %E3%81%AE%E7%BF%92%E5%BE%97
    

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34. 
    https://magazine.rubyist.net/articles/0042/0042-index.html
    

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35. ͳͥώΞυΩϡϝϯτͷ࿩ʁ
    • parse.y Λཧղ͢ΔҰॿʹͳΔ
    
    • ΤοδέʔεʹͳΓ΍͍͢
    

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36. RubyͷώΞυΩϡϝϯτ
    

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37. Do you know here
    document?
    

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38. 3VCZͷώΞυΩϡϝϯτ
    str = <Ruby is...
    A dynamic, open source programming language with a focus on simplicity and
    productivity. It has an elegant syntax that is natural to read and easy to write.
    STR
    puts str
    # Ruby is...
    # A dynamic, open source programming language with a focus on simplicity and
    productivity. It
    # has an elegant syntax that is natural to read and easy to write.
    

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39. 3VCZͷώΞυΩϡϝϯτ
    str = <Ruby is...
    A dynamic, open source programming language with a focus on simplicity and
    productivity. It has an elegant syntax that is natural to read and easy to write.
    STR
    puts str
    # Ruby is...
    # A dynamic, open source programming language with a focus on simplicity and
    productivity. It
    # has an elegant syntax that is natural to read and easy to write.
    

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40. 3VCZͷώΞυΩϡϝϯτ
    str = <Ruby is...
    A dynamic, open source programming language with a focus on simplicity and
    productivity. It has an elegant syntax that is natural to read and easy to write.
    STR
    puts str
    # Ruby is...
    # A dynamic, open source programming language with a focus on simplicity and
    productivity. It
    # has an elegant syntax that is natural to read and easy to write.
    

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41. 3VCZͷώΞυΩϡϝϯτ
    • <
    • <<-STR
    
    • <<~STR
    

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42. 453
    • υΩϡϝϯτͷΠϯσϯτ͸ͦͷ··
    
    • ऴ୺ߦͷΠϯσϯτ͕ڐՄ͞Εͳ͍
    puts <abcde
    fghij
    STR
    abcde
    fghij
    

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43. 453
    puts <abcde
    fghij
    STR
    # => syntax error, unexpected end-of-input
    

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44. 453
    • υΩϡϝϯτͷΠϯσϯτ͸ͦͷ··
    
    • ऴ୺ߦ͕ΠϯσϯτՄೳ
    puts <<-STR
    abcde
    fghij
    STR
    abcde
    fghij
    

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45. d453
    • υΩϡϝϯτͷΠϯσϯτ͕Ұ൪ઙ͍ͱ͜Ζʹௐ੔͞Ε
    Δ
    
    • ऴ୺ߦ͕ΠϯσϯτՄೳ
    puts <<~STR
    abcde
    fghij
    STR
    abcde
    fghij
    

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46. 3VCZͷώΞυΩϡϝϯτ
    • <<"STR" (ࣜల։͢Δ)
    
    • <<'STR' (ࣜల։͠ͳ͍)
    
    • <<`STR` (ίϚϯυ࣮ߦ)
    puts <<"STR"
    #{1 + 2}
    STR
    # => 3
    puts <<'STR'
    #{1 + 2}
    STR
    # => #{1 + 2}
    puts <<`STR`
    uname
    STR
    # => Darwin
    

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47. ώΞυΩϡϝϯτ͕ศརͳͱ͜
    • ώΞυΩϡϝϯτΛϨγʔόʹͰ͖Δ
    
    • ώΞυΩϡϝϯτͷͳ͔ʹώΞυΩϡϝϯτ͕ॻ͚Δ
    
    • 1ߦʹෳ਺ͷώΞυΩϡϝϯτ͕ॻ͚Δ
    

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48. • STR1 ͕Ϩγʔό
    
    • #upcase ͕ϝιου
    ϨγʔόʹͰ͖Δ
    p <This is str1.
    STR1
    # "THIS IS STR1.\n"
    

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49. ͳ͔ʹώΞυΩϡϝϯτ͕ॻ͚Δ
    p <This is str1.
    #{<This is str2.
    STR2
    ABCDE
    STR1
    # "This is str1.\nThis is str2.\n. 12345\nABCDE\n"
    

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50. • String#+ ͸จࣈྻ݁߹
    ߦʹෳ਺ͷώΞυΩϡϝϯτ͕ॻ͚Δ
    p (<This is str1.
    STR1
    This is str2.
    STR2
    # "This is str1.\nThis is str2.\n"
    

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51. • p ( ·ͰಡΉ
    ߦʹෳ਺ͷώΞυΩϡϝϯτ͕ॻ͚Δ
    p (
    # "This is str1.\nThis is str2.\n"
    

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52. • <ߦʹෳ਺ͷώΞυΩϡϝϯτ͕ॻ͚Δ
    p (<# "This is str1.\nThis is str2.\n"
    

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53. • STR1 ·ͰಡΜͰɺheredocΛಡΈͱΔঢ়ଶΛ͵͚Δ
    ߦʹෳ਺ͷώΞυΩϡϝϯτ͕ॻ͚Δ
    p (<This is str1.
    STR1
    # "This is str1.\nThis is str2.\n"
    

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54. • + ΛಡΉ
    ߦʹෳ਺ͷώΞυΩϡϝϯτ͕ॻ͚Δ
    p (<This is str1.
    STR1
    # "This is str1.\nThis is str2.\n"
    

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55. • <ߦʹෳ਺ͷώΞυΩϡϝϯτ͕ॻ͚Δ
    p (<This is str1.
    STR1
    # "This is str1.\nThis is str2.\n"
    

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56. • STR2 ·ͰಡΜͰɺheredocΛಡΈͱΔঢ়ଶΛ͵͚Δ
    ߦʹෳ਺ͷώΞυΩϡϝϯτ͕ॻ͚Δ
    p (<This is str1.
    STR1
    This is str2.
    STR2
    # "This is str1.\nThis is str2.\n"
    

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57. • ) ΛಡΉ
    ߦʹෳ਺ͷώΞυΩϡϝϯτ͕ॻ͚Δ
    p (<This is str1.
    STR1
    This is str2.
    STR2
    # "This is str1.\nThis is str2.\n"
    

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58. ߦʹෳ਺ͷώΞυΩϡϝϯτ͕ॻ͚Δ
    • ͋ΔߦΛॲཧ͍ͯ͠Δ్தͰ࣍ͷߦʹ͍͚Δ
    

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59. # +- nd_body:
    # @ NODE_DASGN_CURR (line: 1, location: (1,0)-
    (1,10))*
    # +- nd_vid: :s
    # +- nd_value:
    # @ NODE_STR (line: 1, location: (1,4)-
    (1,10))*
    # +- nd_lit: "abcde\n fghij\n"
    Ґஔ৘ใ
    s = <<~STR
    abcde
    fghij
    STR
    

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60. ༨ஊ (1)
    

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61. ࣮༻ྫ
    • 1ߦʹෳ਺ώΞυΩϡϝϯτ
    
    • จࣈྻల։தʹώΞυΩϡϝϯτ
    https://github.com/ruby/ruby/blob/trunk/test/ruby/test_array.rb#L2010
    

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62. ༨ஊ (2)
    

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63. https://twitter.com/mametter/status/936197656824619008
    

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64. • pi ͸ π (ԁप཰)
    
    • e ͸ωΠϐΞ਺
    $ ruby pie.rb
    Traceback (most recent call last):
    11: from pie.rb:3:in `'
    10: from pie.rb:1:in `_2_'
    9: from pie.rb:4:in `_7_'
    8: from pie.rb:1:in `_1_'
    7: from pie.rb:5:in `_8_'
    6: from pie.rb:9:in `_2_'
    5: from pie.rb:2:in `_8_'
    4: from pie.rb:6:in `_1_'
    3: from pie.rb:5:in `_8_'
    2: from pie.rb:3:in `_2_'
    1: from pie.rb:5:in `_8_'
    pie.rb:10:in `end': ^ ^ (Look_Forward_Ruby_2_5)
    | |
    pi e
    

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65. • “Look_Forward_Ruby_2_5” exception ͷbacktrace
    $ ruby pie.rb
    Traceback (most recent call last):
    11: from pie.rb:3:in `'
    10: from pie.rb:1:in `_2_'
    9: from pie.rb:4:in `_7_'
    8: from pie.rb:1:in `_1_'
    7: from pie.rb:5:in `_8_'
    6: from pie.rb:9:in `_2_'
    5: from pie.rb:2:in `_8_'
    4: from pie.rb:6:in `_1_'
    3: from pie.rb:5:in `_8_'
    2: from pie.rb:3:in `_2_'
    1: from pie.rb:5:in `_8_'
    pie.rb:10:in `end': ^ ^ (Look_Forward_Ruby_2_5)
    | |
    pi e
    

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66. • e ͸ method name (easy)
    
    • pi ͸ backtrace (strange)
    $ ruby pie.rb
    Traceback (most recent call last):
    11: from pie.rb:3:in `'
    10: from pie.rb:1:in `_2_'
    9: from pie.rb:4:in `_7_'
    8: from pie.rb:1:in `_1_'
    7: from pie.rb:5:in `_8_'
    6: from pie.rb:9:in `_2_'
    5: from pie.rb:2:in `_8_'
    4: from pie.rb:6:in `_1_'
    3: from pie.rb:5:in `_8_'
    2: from pie.rb:3:in `_2_'
    1: from pie.rb:5:in `_8_'
    pie.rb:10:in `end': ^ ^ (Look_Forward_Ruby_2_5)
    | |
    pi e
    

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67. • e ͸ method name (easy)
    
    • pi ͸ backtrace (strange)
    $ ruby pie.rb
    Traceback (most recent call last):
    11: from pie.rb:3:in `'
    10: from pie.rb:1:in `_2_'
    9: from pie.rb:4:in `_7_'
    8: from pie.rb:1:in `_1_'
    7: from pie.rb:5:in `_8_'
    6: from pie.rb:9:in `_2_'
    5: from pie.rb:2:in `_8_'
    4: from pie.rb:6:in `_1_'
    3: from pie.rb:5:in `_8_'
    2: from pie.rb:3:in `_2_'
    1: from pie.rb:5:in `_8_'
    pie.rb:10:in `end': ^ ^ (Look_Forward_Ruby_2_5)
    | |
    pi e
    

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68. ߦʹෳ਺ͷώΞυΩϡϝϯτ͕ॻ͚Δ
    • ͋ΔߦΛॲཧ͍ͯ͠Δ్தͰ࣍ͷߦʹ͍͚Δ
    

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69. module M1;def self._1_; M51._8_;end;end; module M1;def self._2_;
    _7_;end;end
    module M2;def self._8_;M6._1_;end;end
    module M3;def self._2_; M53._8_;end;end; <#{def _7_; M1._1_; end}
    #{module M51;def self._8_;M9._2_;end;end; module M52;def
    self._8_;M3._2_;end;end; module M53;def self._8_; M10.end;end;end}
    #{module M6;def self._1_; M52._8_;end;end;}
    #{def _1_; raise; end}
    #{module M9;def self._2_; M2._8_;end;end}
    #{class Look_Forward_Ruby_2_5 < Exception;end; module M10; def
    self.end; raise Look_Forward_Ruby_2_5.new(" ^ ^\n
    | |\n pi e");end;end}
    STR1
    

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70. module M1;def self._1_; M51._8_;end;end; module M1;def self._2_;
    _7_;end;end
    module M2;def self._8_;M6._1_;end;end
    module M3;def self._2_; M53._8_;end;end; <#{def _7_; M1._1_; end}
    #{module M51;def self._8_;M9._2_;end;end; module M52;def
    self._8_;M3._2_;end;end; module M53;def self._8_; M10.end;end;end}
    #{module M6;def self._1_; M52._8_;end;end;}
    #{def _1_; raise; end}
    #{module M9;def self._2_; M2._8_;end;end}
    #{class Look_Forward_Ruby_2_5 < Exception;end; module M10; def
    self.end; raise Look_Forward_Ruby_2_5.new(" ^ ^\n
    | |\n pi e");end;end}
    STR1
    Go to next line
    

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71. module M1;def self._1_; M51._8_;end;end; module M1;def self._2_;
    _7_;end;end
    module M2;def self._8_;M6._1_;end;end
    module M3;def self._2_; M53._8_;end;end; <#{def _7_; M1._1_; end}
    #{module M51;def self._8_;M9._2_;end;end; module M52;def
    self._8_;M3._2_;end;end; module M53;def self._8_; M10.end;end;end}
    #{module M6;def self._1_; M52._8_;end;end;}
    #{def _1_; raise; end}
    #{module M9;def self._2_; M2._8_;end;end}
    #{class Look_Forward_Ruby_2_5 < Exception;end; module M10; def
    self.end; raise Look_Forward_Ruby_2_5.new(" ^ ^\n
    | |\n pi e");end;end}
    STR1
    Go to next line
    Define method(s)
    

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72. module M1;def self._1_; M51._8_;end;end; module M1;def self._2_;
    _7_;end;end
    module M2;def self._8_;M6._1_;end;end
    module M3;def self._2_; M53._8_;end;end; <#{def _7_; M1._1_; end}
    #{module M51;def self._8_;M9._2_;end;end; module M52;def
    self._8_;M3._2_;end;end; module M53;def self._8_; M10.end;end;end}
    #{module M6;def self._1_; M52._8_;end;end;}
    #{def _1_; raise; end}
    #{module M9;def self._2_; M2._8_;end;end}
    #{class Look_Forward_Ruby_2_5 < Exception;end; module M10; def
    self.end; raise Look_Forward_Ruby_2_5.new(" ^ ^\n
    | |\n pi e");end;end}
    STR1
    Go to next line
    Define method(s)
    Go back
    

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73. module M1;def self._1_; M51._8_;end;end; module M1;def self._2_;
    _7_;end;end
    module M2;def self._8_;M6._1_;end;end
    module M3;def self._2_; M53._8_;end;end; <#{def _7_; M1._1_; end}
    #{module M51;def self._8_;M9._2_;end;end; module M52;def
    self._8_;M3._2_;end;end; module M53;def self._8_; M10.end;end;end}
    #{module M6;def self._1_; M52._8_;end;end;}
    #{def _1_; raise; end}
    #{module M9;def self._2_; M2._8_;end;end}
    #{class Look_Forward_Ruby_2_5 < Exception;end; module M10; def
    self.end; raise Look_Forward_Ruby_2_5.new(" ^ ^\n
    | |\n pi e");end;end}
    STR1
    Go to next line
    Define method(s)
    Go back
    Call entry point
    

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74. parser͔ΒΈͨ
    ώΞυΩϡϝϯτ
    

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75. IFSFEPDNPEFͱ͸
    • lex.strtermͷঢ়ଶͷ͜ͱ
    static enum yytokentype
    parser_yylex(struct parser_params *p)
    {
    ...
    if (p->lex.strterm) {
    if (p->lex.strterm->flags & STRTERM_HEREDOC) {
    return here_document(p, &p->lex.strterm->u.heredoc);
    }
    else {
    token_flush(p);
    return parse_string(p, &p->lex.strterm->u.literal);
    }
    }
    ...
    

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76. ॏཁͳؔ਺
    • heredoc_identifier
    
    • heredoc modeʹೖΔ
    
    • heredoc_restore
    
    • heredoc mode͔Βग़Δ
    

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77. IFSFEPD@JEFOUJpFS
    • func: Indent΍Quoteͷ৘ใ
    
    • term_len: <
    • term: STR ͱ͍͏String
    
    • lastline: ݱࡏͷߦ΁ͷϙΠϯλ
    
    • lastidx: <
    • ruby_sourceline: ݱࡏͷߦ൪߸
    

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78. • func: 0x22 (INDENT & EXPAND)
    p <<-STR1.upcase
    This is str1.
    STR1
    

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79. • func: 0x22 (INDENT & EXPAND)
    
    • term_len: 3
    
    • term: STR1
    p <<-STR1.upcase
    This is str1.
    STR1
    term_len term
    

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80. • func: 0x22 (INDENT & EXPAND)
    
    • term_len: 3
    
    • term: STR1
    p <<-STR1.upcase
    This is str1.
    STR1
    Ґஔ৘ใ = term_len + term
    

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81. • func: 0x22 (INDENT & EXPAND)
    
    • term_len: 3
    
    • term: STR1
    
    • lastidx: 9
    
    • ruby_sourceline: 1
    p <<-STR1.upcase
    This is str1.
    STR1
    lastidx
    lastline
    

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82. • func: 0x22 (INDENT & EXPAND)
    
    • term_len: 3
    
    • term: STR1
    
    • lastidx: 9
    
    • ruby_sourceline: 1
    p <<-STR1.upcase
    This is str1.
    STR1
    lastidx
    lastline
    

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83. • ҎԼͷ3ͭ͸1ͭͷStringΦϒδΣΫτʹͳ͍ͬͯΔ
    
    • term_len: 3
    
    • func: 0x22 (INDENT & EXPAND)
    
    • term: STR1
    p <<-STR1.upcase
    This is str1.
    STR1
    term_len term
    3 0x22 STR1
    ͸·ΓͲ͜Ζ
    String
    

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84. ·ͱΊ
    • Ruby 2.6Ͱ͸ RubyVM::AST ͕ಋೖ͞ΕΔ༧ఆ
    
    • RubyͷώΞυΩϡϝϯτ͸ػೳ͕ͨ͘͞Μ͋Δ
    
    • ώΞυΩϡϝϯτ͸ΤοδέʔεʹͳΓ΍͍͢
    

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85. Thank you !!
    

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