Metaprogramming in Ruby
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This document discusses metaprogramming in Ruby. It introduces metaprogramming and how it can be used to create domain-specific languages and modify code at runtime. Examples are given of Hacko, a small language created through metaprogramming, and how Lisp, Scheme, Smalltalk, and other languages utilize metaprogramming techniques. Common uses of metaprogramming in applications like web frameworks and artificial intelligence are also mentioned. The document explores how metaprogramming works in different languages and addresses performance concerns.
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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!