From: dblack@...
Date: 2002-10-24T20:04:23+09:00
Subject: Re: Read "current line" from a file?

Hi --

On Thu, 24 Oct 2002, Gavin Sinclair wrote:

> All,
>
> Given an IO object, you can get the "next" line with #gets, right?
>
> Given an IO object, you can get the "current" line with #X, right?  Please?
>
> I know it's not a common operation, but I would like tobe able to do it.

Do you mean a kind of one-line lookahead?  I had occasion to do that
somewhere recently, and did:

  class File
    def ungets(str)
      seek(pos - str.size,0)
    end

    # One-line lookahead.
    def next_line
      line = gets
      ungets(line) if line
      line
    end
  end


David

-- 
David Alan Black
home: dblack@candle.superlink.net
work: blackdav@shu.edu
Web:  http://pirate.shu.edu/~blackdav