From: Michael campbell <michael_s_campbell@...>
Date: 2004-02-01T10:05:27+09:00
Subject: Re: Save the flip/flop op!

Phil Tomson wrote:

> 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.


No doubt.

I haven't had a chance to try it yet, but do either Avi's or Nathaniel's solutions work in the 

"do_something if something..something_else"

form?