Metaprogramming in Ruby
- 1. Metaprogramming in Ruby Creating languages in just a sec! http://jon.is.emotionull.com
- 2. Creating a language Parsers from scratch Bison/yacc/lex Metaprogramming FTW!
- 3. Hacko! Example // this is a test (example.hacko) include ”stdio” main { printf ”Hello Mr. %s !”, ”Jon” }
- 4. Bow to the masters Lisp Scheme Forth Smalltalk
- 5. Thinking again the problem Code as data Self modifying code Dynamic adding/removing classes/functions Describe the problem, don't solve it!
- 6. Metaprogramming in the wild Web frameworks (Ruby On Rails) A.I DSL Configuration files ...
- 7. But, hooooow??? Function pointers (C,C++) Open classes (Ruby) Metaclasses (Python) Lists (Lisp/Scheme/Clojure)
- 8. Speed penalty – Not always Premature optimization Fast and smart VM (JVM) Bottleneck is somewhere else You are not smart enough. Deal with it!
- 9. Hacko! Implemented in ~ 10 minutes Looks like C Feels like C FULLY extensible Trivial to add new libraries You can use available Ruby libs VM ~ 25 lines!
- 10. Thank for watching! Questions? http://jon.is.emotionull.com [email protected]