From: Carl Lerche <carl.lerche@...>
Date: 2007-02-22T09:37:51+09:00
Subject: Re: Parsing a file with look ahead

The first thing I can think of is do file.each_line and store that
line in a previous_line variable at the end of the proc. Then you have
access to the line that was read before hand and the current one.

On 2/21/07, S. Robert James <srobertjames@gmail.com> wrote:
> I need to parse a file line by line, and output the results line by
> line (too big to fit into memory).  So far, simple enough:
> file.each_line.
>
> However, the parser needs the ability to peek ahead to the next line,
> in order to parse this line.  What's the right way to do this? Again,
> I really don't want to try to slurp the whole file into memory and
> split on newlines.
>
> Here's an example:
> Line1: Hi
> Line2: How
> Line3: Are
> Line4: you?
>
> I'd like to:
> parse('Hi', 'How')
> parse('How', 'Are')
> parse('Are', 'you?')
> parse('you?', false)
> # hey, this is practically a unit test!
>
> Any ideas?
>
>
>


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