Implement beautiful DSL for iOS using Ruby

At RubyConf Taiwan 2014 #ruby #rubyconftw

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
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.
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/
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!
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?