Code Generation. The Safety Scissors Of Metaprogramming

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Shawn Porter
5 years ago
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1 Code Generation The Safety Scissors Of Metaprogramming

2 Ruby2Ruby

3 (lambda do puts hello world end).to_ruby

4 class Widget < ActiveRecord::Base end

5 Ruby2Ruby.translate(Widget)

6 class Widget < ActiveRecord::Base has_one :foo end

7 Ruby2Ruby.translate(Widget)

12 overkill

13 monkeypatching

14 tangled object graph

15 stop monkey-patching!

16 nothing can ever protect you from bad programming

17 nothing can ever protect you from bad programming

20 tests specs

21 tests y u need specs

23 tests rawk

24 debuggers suck

25 debuggers suck

26 monkey-patch monkey-patching itself

27 meta-monkey-patching

28 rubinius

29 nodebox

30 code == data

31 at this point, I just demoed code from my blog. below is a link to the post: (code samples are included)

33 simple object graph

34 nodebox

35 tangled object graph

36 node box

37 same tool

38 different output

39 proof of concept

41 foo

42 foo bar

43 foo bar baz

44 foo bar foo bar foo foo bar bar baz foo bar baz foo foo foo baz bar baz bar bar baz baz

45 debuggers suck

46 some people want debuggers

48 Ruby has no tool support!

49 1 day

50 shock the monkey

51 Powerful Tools

52 Rubinius Nodebox code == data Powerful Tools

53 Rubinius Nodebox code == data Powerful Tools

54 Rubinius Nodebox code == data Powerful Tools

55 Rubinius Nodebox code == data

56 code == data

57 1998

58 generated HTML

59 automated cvs and rcs

61 EJB (2003)

62 legacy app: 150 tables

63 ejb: 7 files per entity

64 7 * 150 = 1050 Java files

65 by hand: 3+ man-years

66 generators: 2 man-months

68 four generator types code munger generator inline code expansion generator mixed-code generator partial-class generator tier generator

69 generating UIs

70 generating unit tests

71 embedding SQL with generators

72 creating database access generators

73 generating web services layers

74 generating models from a business logic DSL

75 sound familiar?

77 script/generate scaffold

78 script/generate resource

79 script/generate plugin

80 script/generate migration

81 script/generate

82 rails Command

83 acts_as_authenticated

84 restful_authentication

85 ActiveRecord SQL

86 ActionPack Helpers ActiveRecordHelper AssetTagHelper AtomFeedHelper BenchmarkHelper CacheHelper CaptureHelper DateHelper DebugHelper FormHelper FormOptionsHelper Text FormTagHelper JavascriptHelper NumberHelper PrototypeHelper RecordTagHelper SanitizeHelper ScriptaculousHelper TagHelper TextHelper UrlHelper RecordIdentificationHelper

87 code generation FTW

88 code == data

89 (eq (code (data)))

91 functions which return functions which return functions which return functions which return functions which return functions which return functions which return functions which return functions which return functions which return functions

92 code which generates data which runs as code which generates data which runs as code which generates data which runs as code which generates data which runs as code which generates data which runs as code

94 lisp macros pwn metaprogramming

95 and you can do them in Perl!

97 shocked? perl!

98 λ the ultimate

99 combinator

100 $

101 small teams$

102 $ small teams lisp macros

103 great programmers can write better programmers than they can hire

104 great programmers can write better programmers than they can hire metaprogramming

105 great?

106 incredible power

107 simple clarity

108 simplicity magic

109 skilled programmers can write better programmers than they can hire metaprogramming

110

111 code which generates data which runs as code which generates data which runs as code which generates data which runs as code which generates data which runs as code which generates data which runs as code

112 Unix.is_a? Lisp

113 # => true

114

115 Caveats! read the book, the technique is easy leveraging it is the clever part you can use Ruby as well as Rubinius if Unix is a Lisp, the filesystem is a compiler

116 Caveats! read the book, the technique is easy leveraging it is the clever part you can use Ruby as well as Rubinius if Unix is a Lisp, the filesystem is a compiler

117 Caveats! read the book, the technique is easy leveraging it is the clever part you can use Ruby as well as Rubinius if Unix is a Lisp, the filesystem is a compiler

118 Caveats! read the book, the technique is easy leveraging it is the clever part you can use Ruby as well as Rubinius if Unix is a Lisp, the filesystem is a compiler

119 Caveats! read the book, the technique is easy leveraging it is the clever part you can use Ruby as well as Rubinius if Unix is a Lisp, the filesystem is a compiler

120

121 Essential Technique read the book, the technique is easy leveraging it is the clever part you can use Ruby as well as Rubinius if Unix is a Lisp, the filesystem is a compiler

122 Essential Technique puts leveraging it is the clever part you can use Ruby as well as Rubinius if Unix is a Lisp, the filesystem is a compiler

123 Essential Technique puts eval you can use Ruby as well as Rubinius if Unix is a Lisp, the filesystem is a compiler

124 Essential Technique puts eval ERB if Unix is a Lisp, the filesystem is a compiler

125 Essential Technique puts eval ERB (unix if Unix pipes) is a Lisp, the filesystem is a compiler

126 Essential Technique open mouth make noise profit if Unix is a Lisp, the filesystem is a compiler

127

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