From: ptkwt@... (Phil Tomson)
Date: 2004-02-01T11:09:54+09:00
Subject: Re: Save the flip/flop op!

In article <401C50D5.601@yahoo.com>,
Michael campbell  <michael_s_campbell@yahoo.com> wrote:
>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?

I haven't tried Nathaniel's proposed solution, but Avi's solution takes a 
block (where the action occurs), so I don't think it would work that way.  
A different method could probably be added to his FlipFLop class that 
could work that way.

Phil