From: luke gruber <luke.gru@...>
Date: 2011-11-07T12:01:13+09:00
Subject: Re: Tricky DSL, how to do it?

Sorry 'bout the double posting, but it hit me that it's only impossible 
to bind a method to an instance that's of the same class. That and the 
fact that the whole binding thing was useless in my previous post made 
me go back to my computer and give it another shot.

It's still not a great solution, because I couldn't figure out how to
inherit from BasicObject and still have it work.

class Evaluator < Object
  attr_reader :__config__, :__outside__

  def initialize(outside, &block)
    @__config__ = {}
    @__outside__ = outside
    instance_eval &block
  end

  def method_missing(sym, *args, &block)
    if block_given?
      outside = @__outside__
      outside.class.class_eval do
        define_method sym do |*args|
          outside.instance_exec *args, &block
        end
      end
      @__config__[sym] = @__outside__.method(sym)
    else
      super
    end
  end

end

class Test
  def hunt
    puts "DEAD"
  end
end

t = Test.new

e = Evaluator.new(t) do
  foo do
    puts "foo"
  end

  baz do
    hunt
  end
end

e.__config__[:foo].call
e.__config__[:baz].call

-Luke

-- 
Posted via http://www.ruby-forum.com/.