From: Daniel Sheppard <daniels@...>
Date: 2006-04-28T10:50:32+09:00
Subject: Re: getting the next line with the iterator

> -----Original Message-----
> From: Eric Boucher [mailto:devlists-ruby-talk@devlists.com] 
> Sent: Friday, 28 April 2006 8:21 AM
> To: ruby-talk ML
> Subject: getting the next line with the iterator
> 
> Hi,
> 
> I would like to know if there is a ruby way to achieve what I 
> want to  
> do. I want to be able to access the next iterator while 
> reading a file.  
> Basically, I want to be able to collect the next 3 lines when I  
> encounter a certain line:

I find this the most readable way to do it, though using generator is
probably slower than just keeping track of the last 3 lines as you go
forward:

require 'generator'
list = []
File.open('toto.txt', 'rb') do |myFile|
	g = Generator.new(myFile)
	while g.next?
		if g.next =~ /regExp/
			3.times { list << g.next }
		end
	end
end
puts list