From: "Ondřej Bílka" <neleai@...>
Date: 2011-07-10T13:17:14+09:00
Subject: [ruby-core:37947] Re: [Ruby 1.9 - Feature #5010][Open] Add Slop(-like) in stdlib and deprecate current OptionParser API

On Sun, Jul 10, 2011 at 10:16:25AM +0900, Eric Hodel wrote:
> On Jul 9, 2011, at 4:19 PM, Rodrigo Rosenfeld Rosas wrote:
> > Em 09-07-2011 20:13, Nobuyoshi Nakada escreveu:
 > 
> > Sorry, Nobu, I didn't get it. Could you explain it better?
> 
> I think Nobu means that formerly OptionParser used instance_eval like slop does inside the parse method.
> 
> This was changed due to confusion of scoping and methods available inside and outside the instance_eval.
> 
> I'd prefer not to have hidden instance_eval for option parsing.  It's too often that I like to refer to items in a scope the execution environment doesn't have.
This reminds me that I instead instance_eval rely on method injection.
What I currently do is temporary add singleton method_missing to
delegate methods. It has relatively sane scoping.
I am wondering if there is way that is not as ugly as my current 
implementation.

def redef(&b)
 b.binding.eval "
  class <<self
    if self.instance_methods.include? \"method_missing\"
      @r=true
      alias_method :mm2,:method_missing
    end
    def method_missing(n,*a)
      Del.send(n,*a) if Del.respond_to? n
			mm2(n,*a) if self.respond_to? :mm2
    end
  end"
  b.call
  b.binding.eval "
  class <<self
    if @r
      alias_method :method_missing,:mm2
    else
      remove_method :method_missing
    end
  end
  "
end

-- 

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