Implement beautiful DSL for iOS using Ruby

Transcript

1. Implement beautiful DSL for iOS using Ruby Francis Chong

2. About me

3. 鍾振輝 Francis Chong @siuying

4. Indie Mobile Dev

5. Why DSL?

6. https://github.com/tzangms/iloveck101 “I love ck101.com” ! “… I just want the

   pictures. But their site is slow, filled with ads and noise … ” @tzangms 海總理
7. None
8. None

9. People found this is a good idea!

10. • Go • https://github.com/wuman/go-ck101 • https://github.com/lazywei/iloveck101 • Ruby • https://github.com/wancw/iloveck101

    • https://github.com/shunwen/iloveck101 • PHP • https://github.com/fukuball/iloveck101 • Objective-C • https://github.com/saiday/hornyfolks • https://github.com/siuying/iloveck101 • Node.js • https://github.com/clonn/iloveck101 • Groovy • https://github.com/tangblack/ groovy_ILoveCK101 • Racket • https://github.com/Domon/iloveck101 • JavaScript • https://github.com/poying/iloveck101 • GreaseMonekey • https://github.com/tomin/iloveck101

11. I made an iOS version too …

12. Can we generalize it?

13. Convert web sites into reusable data.

14. None
15. None

16. Goals • Keep existing code and tools • Add dynamic

    behavior to a static app • Interact with native code • Simple to read and write

17. DSL

18. Domain 
 Specific 
 Language

19. –Martin Fowler “DSLs are small languages, focused on a particular

    aspect of a software system.”

20. External & Internal DSL

21. How to implement DSL for iOS

22. Internal DSL with Objective-C / RubyMotion

23. Masonry https://github.com/cloudkite/Masonry

24. Moria https://github.com/siuying/moria

25. Kiwi https://github.com/allending/Kiwi

26. Parser generator like Bison, CoreParse or PEGKit

27. NUI https://github.com/tombenner/nui

28. mruby

29. objc-mruby example

30. JavaScriptCore

31. iOS 7.0

32. Bi-directional Bridge http://blog.bignerdranch.com/3784-javascriptcore-and-ios-7/

33. None

34. … but this is a Ruby conference?

35. Opal

36. Ruby to JavaScript Compiler http://opalrb.org/try/

37. Output

38. JavaScriptCore + Opal

39. Expose Native Classes to JS

40. Opal Wrapper for JS

41. Example

42. Goal: Convert web sites into reusable data.

43. Designing the DSL

44. 1. Write an imaginary DSL

45. 2. Make it valid

46. 3. Make it work

47. 4. Add more use case

48. Everything

49. http://cl.ly/3Y1y0N3y2J1V

50. Now we’ve supported one site

51. Let’s add more!

52. None

53. http://cl.ly/0R0k0t1x2v2r

54. Users could change the code themselves

55. Add sites without recompile

56. Practical Tips

57. JavaScriptCoreOpalAdditions

58. Compile Opal in Runtime

59. IGJavaScriptConsole

60. Interactive Console

61. Rake and sprockets

62. Gemfile

63. Rakefile

64. Integrate the project into Xcode

65. Custom Build Phase

66. Add build task to project

67. Pros and Cons

68. Based on features in iOS SDK

69. Dynamic behavior

70. Interaction with native code.

71. Easy to read and write.

72. One more layer of indirection.

73. –App Store Review Guidelines “Apps that download code in any

    way or form will be rejected.”

74. Readings

75. http://www.duokan.com/book/43469

76. http://www.amazon.com/gp/product/0321712943

77. Question?