From: dblack@...
Date: 2007-07-20T15:52:50+09:00
Subject: Re: line.split with some complicating factors...

Hi --

On Fri, 20 Jul 2007, Marc Hoeppner wrote:

> Hi all,
>
> I've been thinking about this for a while but cant figure out an
> efficient (or any actually) way to do the following:
>
> a line contains a list of coordinates (specifying a range) separated by
> a ","  like so:
>
> 50586..50639,50795..51859,60005..60058,60256..61236
>
> Pulling out the separate coordinates via split is of course rather
> simple. But, here's the catch...
> I not only need the given ranges, but also the stretches in between (I
> am pulling the coordinates out of a large text file, so there is no good
> way to manipulate the source). So the whole range is in reality
> everything between the first and the last number...However, I have to
> treat the originally given ranges and the stretches in between
> differently. The given ranges are printed in upcase, the parts not
> specified in downcase. Now, a way this could look like would be:
>
> E50586..50639,50640..50795,E50795..51859,..
>
> The "E" at the beginning is then used to identify the original ranges
> and as a condition for printing in upcase.
>
> So, my point being...I have absolutely no clue how to do this. The
> procedure would have to split the given ranges but also immediately
> write the missing ranges in the correct order.
>
> If anyone has an idea how to approach this, I could really need some
> advice here.

I'm not sure if this is an exact fit but see if it helps.  This is
based on the first string (no E characters, etc.):

ranges = str.scan(/(\d+)\.\.(\d+)/).map {|a,b| a.to_i..b.to_i }
betweens = str.scan(/(\d+),(\d+)/).map {|a,b| (a.to_i+1)..b.to_i-1 }


David

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