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![Hash method syntax
• Ruby 1.9’s hash syntax with Symbol keys:
a = { foo: 1, bar: 2, baz: “Hello, world” }
• ...looks a bit like:
[@”Hello, world” rangeOfString:@”ello”
options: NSCaseInsensitiveSearch]
• Let’s go with that!](https://image.slidesharecdn.com/macruby-110617115423-phpapp02/75/MacRuby-33-2048.jpg)
![Hash method syntax
• MacRuby turns method calls with hash
arguments into SEL
• MacRuby turns method definitions with
hash lists into SEL
• MacRuby can call Objective-C
• Objective-C can call MacRuby, but when
possible you should use:
[[MacRuby sharedRuntime]
performRubySelector:@”foo”]](https://image.slidesharecdn.com/macruby-110617115423-phpapp02/75/MacRuby-34-2048.jpg)
MacRuby
- 1. MacRuby What is it? and why should you care? Presented by: Joshua Ballanco
- 2. A bit aboutme... • Using Ruby since 2004 (didn’t discover Rails until 2006) • Worked for Apple 2006-2010 (Fifth Ave store & HQ in Cupertino) • Now at Patch (just completed a migration to Ruby 1.9) • MacRuby Core Team member
- 3. Overview • Practical MacRuby • How is MacRuby different? • Working with Cocoa • Compiled Ruby! • Make your millions on the App store • Nuts & Bolts • GC • Regular Expression Engine • Hash method syntax • LLVM & other Hacking • GCD
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- 8. What is MacRuby? •http://www.macruby.org • http://www.macruby.org/files/ • http://www.macruby.org/files/nightlies/ • Available from RVM (but not recommended) • Source now located at GitHub! https://github.com/MacRuby/MacRuby
- 9. What is MacRuby? •Compiling MacRuby: • Need LLVM (see the README; brew install llvm) • rake ; sudo rake install • Bugs – https://www.macruby.org/trac/report • MacRuby-devel mailing list • @macruby, #macruby
- 10. No Really, Whatis MacRuby?
- 11. No Really, Whatis MacRuby? A language with: • Dynamic typing • Objects everywhere • Method calls via sending messages • Automatic generation of accessors • Methods can be added to classes at runtime • Garbage Collection • Closures
- 12. No Really, Whatis MacRuby? A language with: • Dynamic typing • Objects everywhere • Method calls via sending messages • Automatic generation of accessors • Methods can be added to classes at runtime • Garbage Collection • Closures ...called Objective-C
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- 14. Ruby Syntax Parser MRI’sparse.y
- 15. Ruby Syntax Parser MRI’s parse.y Compiler RoxorCompiler <C++>
- 16. Ruby Syntax Parser MRI’s parse.y Compiler RoxorCompiler <C++> VM (sans GVL) RoxorVM & RoxorCore <C++>
- 17. Ruby Syntax Parser MRI’s parse.y Compiler RoxorCompiler <C++> VM (sans GVL) LLVM (with JIT) RoxorVM & RoxorCore <C++>
- 18. Ruby Syntax Parser MRI’s parse.y Compiler RoxorCompiler <C++> VM (sans GVL) LLVM (with JIT) RoxorVM & RoxorCore <C++>
- 19. Ruby Syntax Parser MRI’s parse.y Compiler RoxorCompiler <C++> VM (sans GVL) LLVM (with JIT) RoxorVM & RoxorCore <C++> Objective-C Runtime
- 20. Integrating with Cocoa •Bridge Support (please download preview 3 from the “files” page) • gen_bridge_metadata reads header files and generates XML descriptions of types and method signatures • MacRuby uses BS files to construct calls and access constants and types • framework “Foundation”
- 21. Integrating with Cocoa •String, Array, Hash, are members of the NSString, NSArray, and NSDictionary class clusters • Caution: NSString, NSArray, and NSDictionary will lie to you! • Time is implemented as a subclass of NSDate
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- 23. A Ruby YouCan Compile • macrubyc • Advantages: • Faster startup, faster runtime (in most cases) • Don’t distribute the source! • Disadvantages: • ? • ...some bugs
- 24. A Ruby YouCan Compile • -c → Compile and assemble; good for multistage builds • -C → Compile, assemble, and link creating an *.rbo • Can also create stand-alone executables and entire “*.framework”s (experimental)
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- 26. I wanna bean App store billionaire... • Downloads contain Xcode templates (mostly work in Xcode 4) • Integration with Interface Builder • macruby_deploy • Includes BS files • Unpacks Gems • Compiles source
- 27. I wanna bean App store billionaire...
- 28. I wanna bean App store billionaire... QuickAlarm Briquette Timey Zero2Nine
- 29. MacRuby Nuts &Bolts
- 30. Garbage Collector: libauto • Yet another open source project from Apple • The GC for Obj-C • Based on write barriers • scanning, conservative, generational, multi- threaded garbage collector... • ...unfortunately...slow
- 31. Garbage Collector: the NextGeneration(?) • Ruby does A LOT of allocations • Nice to not have to stop the world, but... • Write barriers are slow • Maybe ref counting? • Maybe MRI’s collector isn’t so bad after all...
- 32. RegExps: ICU • Oniguruma is not (real thread) thread safe • ICU is • thread safe • Unicode compatible • not as crazy feature-full as Oniguruma • There are some bugs...but honestly, stop doing that with RegExps!!!
- 33. Hash method syntax •Ruby 1.9’s hash syntax with Symbol keys: a = { foo: 1, bar: 2, baz: “Hello, world” } • ...looks a bit like: [@”Hello, world” rangeOfString:@”ello” options: NSCaseInsensitiveSearch] • Let’s go with that!
- 34. Hash method syntax •MacRuby turns method calls with hash arguments into SEL • MacRuby turns method definitions with hash lists into SEL • MacRuby can call Objective-C • Objective-C can call MacRuby, but when possible you should use: [[MacRuby sharedRuntime] performRubySelector:@”foo”]
- 35. LLVM, JIT, andHacking • LLVM provides optimizations • LLVM provides JIT utilities (kinda slow) • MacRuby can emit LLVM... VM_DUMP_IR=1 macruby -e "def foo; puts 'hello'; end; foo" • Find other neat tricks in HACKING.rdoc
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- 37. GCD & TheFuture
- 38. GCD • MacRuby cantap directly into GCD • Dispatch module: • Dispatch::Queue • Dispatch::Group • Dispatch::Source • Dispatch Gem too!
- 39. GCD • Dispatch isa powerful tool for concurrent programming • Example: ControlTower • MacRuby Rack-based server • Uses GCD to handle requets • Accomplishes in 1 line what takes Thin/ EventMachine > 6000 lines of C++ & Ruby
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- 41. GCD • Can wemake GCD work in MRI? • JRuby thinks they can make it work... https://github.com/headius/jcd • GCD is Multithreaded Programming, Ruby Style
- 42. Who Is MacRuby? • Laurent Sansonetti • Watson • Vincent Isambart • Takao Kouji • Eloy Durán • Mark Rada • Matt Aimonetti • You? • Joshua Ballanco • Thibault Martin- Lagardette
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