Re: Scoping and locating definitions

On Jan 18, 2007, at 15:53, Jos Backus wrote:

> Consider the following:
>
> lizzy:~% cat r
> require 'lib'
> # from 'lib' import 'Foo'
>
> f = Foo.new("string")
> p f.bar
>
> p 'abc'.rot13
> lizzy:~% cat lib.rb
> class String
>   def rot13
>     tr 'A-Za-z', 'N-ZA-Mn-za-m'
>   end
> end
>
> class Foo
>   def initialize(s)
>     @s = s
>   end
>
>   def bar
>     @s.rot13
>   end
> end
> lizzy:~% ruby r
> "fgevat"
> "nop"
> lizzy:~%
>
> What if I wanted String#rot13 to _not_ be visible in file  
> `r' (because I
> didn't ask for it)?  How do I contain the change to String to  
> lib.rb only?

Currently you can't.

> Or perhaps to Foo?

Define Foo#rot13

> On a related note: how does one go about finding _where_  
> String#rot13 was
> defined? One possible way would be for .methods to return an Array of
> BoundMethods instead of Strings and have file and linenumber  
> information be
> part of BoundMethod (if possible).
>
> Thoughts?

grep?

-- 
Eric Hodel - [e-mail] - http://blog.segment7.net

I LIT YOUR GEM ON FIRE!