From: Sandro Paganotti <sandro.paganotti@...>
Date: 2008-10-22T20:42:25+09:00
Subject: Re: Is there a method_eval or similar thing ?

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I think that maybe you can wrap everything in a class:

class Ask
  def initialize(question)
    @question = question; @h={}
    yield(self)
  end
  def actionbind(key, &block)
    @h[key] = block
  end
end

Ask.new("Do you wish to proceed?") do |question|
 question.actionbind(:yes){ puts "user pressed yes" }
 question.actionbind(:no) { puts "user pressed no" }
end



On Wed, Oct 22, 2008 at 9:38 AM, Nit Khair <sentinel.2001@gmx.com> wrote:

> I have a method called askyesno which takes a string and returns whether
> the user pressed y or n. However, I now want the user to be able to pass
> a block in with blocks for what to do for YES and NO.
>
> However, in this block I need to be able to access method level
> variables. Here's how i am trying to code a sample of it. btw, askyesno
> will actually sit inside a module in my app.
>
> --
> # the ch here is only for testing, it contains y or n, so we can test
> this out
> # easily
>
> def askyn(str, ch, &bl)
>  puts str
>  h = {}
>
>  def actionbind(key, &block)
>    h[key] = block
>  end
>
>  if block_given?
>    method_eval(&bl)    # or module_eval etc
>  end
>
>  case ch
>  when 'y'
>    h[:yes].call if h.include? :yes
>  when 'n'
>    h[:no].call if h.include? :no
>  end
> end
>
> askyn("Do you wish to proceed?", 'n') do
>  actionbind(:yes)  { puts "user pressed yes" }
>  actionbind(:no)  { puts "user pressed no" }
> end
>
>
> Currently, i have "ask" methods that allow for many options (not just
> yes/no), the selection is passed back to the caller and he has a
> case-when in which he takes appropriate action.
>
> I was considering trying out something like the above where he could
> pass in proc - bindings for each key. Is there any way to access the
> hash "h" from the block ?
> --
> Posted via http://www.ruby-forum.com/.
>
>


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