Re: override.rb

On Thu, 28 Dec 2006, Pit Capitain wrote:

> [e-mail] schrieb:
>> (... code to override and restore methods ...)
>
> Ara, though I find this very interesting I've not much time to figure it out 
> myself, so could you please show us an example with #overriding and 
> #restoring ?

   harp:~ > cat a.rb
   require 'override'

   class C
     c = new

     def m() 'a' end
     def n() 'x' end

     p c.m #=> a
     p c.n #=> x

     overriding{
       def m() super << 'b' end
       def n() super << 'y' end
     }

     p c.m #=> ab
     p c.n #=> xy

     restoring{ m and n }

     p c.m #=> a
     p c.n #=> x
   end


   harp:~ > ruby a.rb
   "a"
   "x"
   "ab"
   "xy"
   "a"
   "x"


i'll probably merge restore/restoring so the above will become

   restore{ m and n }

>> can people break this?
>
> What do you mean by "break"?

just finding bugs.

regards.

ps. latest version inlined below

-a
-- 
if you find yourself slandering anybody, first imagine that your mouth is
filled with excrement.  it will break you of the habit quickly enough. - the
dalai lama

file: override.rb


class Module
   def singleton_class &b
     @singleton_class ||= (class << self; self; end)
     @singleton_class.module_eval &b if b
     @singleton_class
   end
   def overload :pattern => :method
     singleton_class{
       module_eval <<-co
     }
   end
end


class C
   def self.new0 i
     p [i]
   end
   def self.new1 i, s
     p [i,s]
   end
   def self.new2 i, s, f
     p [i,s,f]
   end
end