From: ptkwt@... (Phil Tomson)
Date: 2004-02-01T09:54:52+09:00
Subject: Re: Save the flip/flop op!

In article <6e869a6b.0401311614.1334a5fc@posting.google.com>,
Avi Bryant <avi@beta4.com> wrote:
>I wrote:
>
>  def from(start_cond, end_cond)
>      @in_range = true if start_cond
>      yield
>      @in_range = false if end_cond
>   end
>
>Ack.  That should be "yield if @in_range", of course.


Seems to work and be nestable, as in the usage here:

ff = FlipFlop.new
ff2= FlipFlop.new
f = File.open('filename')
f.each_line {|l|
  ff.from(l=~/BEGIN/, l=~/END/) do
     #inside the BEGIN .. END block
     ff2.from(l=~/def/,l=~/end/) do
       #inside def .. end block
       puts l
     end
  end
}

But it's more cumbersome having to predeclare all the FlipFlops.

Phil