From: Rolf Pedersen <rolfhsp@...>
Date: 2010-07-07T18:35:54+09:00
Subject: Re: File data extraction

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Robert:
The use of flip flop operator opened a new door for me. Didn't know of this
before...
And new knowledge is the best knowledge! :o)

w_a_x_man:
I can't believe I didn't think of the possibility to use a simple split
instead of a scan to extract the filenames between the first two quotation
marks!

Thanks to all for the great input I've gotten on this issue!
:o)

Best regards,
Rolf

On Mon, Jul 5, 2010 at 8:25 PM, w_a_x_man <w_a_x_man@yahoo.com> wrote:

> On Jul 5, 3:48 am, Rolf Pedersen <rolf...@gmail.com> wrote:
> > [Note:  parts of this message were removed to make it a legal post.]
> >
> > Hi
> >
> > I have a file with the following format (example):
> >
> > Save Format v3.0(19990112)
> > @begin Libraries
> >  "felles.pbl" "";
> > @end;
> > @begin Objects
> >  "n_cst_xml_utils.sru" "felles.pbl";
> >  "n_melding.sru" "felles.pbl";
> > @end;
> >
> > The data in the two begin/end blocks are lists, which may be longer than
> > shown.
> >
> > I'd like to extract an array of the filenames (first quote) in the @begin
> > Objects ... @end; block.
> > For the example above this should return ["n_cst_xml_utils.sru",
> > "n_melding.sru"]
> >
> > My initial idea was to treat the whole thing as one long string, and
> extract
> > the part within the being-end-block by using regexp, converting the
> result
> > back to individual lines (split '\n') and doing array.map and regexp to
> > single out the name in the first quote on each line.
> > But I keep hitting the wall, especially with the first step in this
> > approach... :o(
> >
> > I know this should be easily done in a couple of lines of code, but I
> can't
> > get it right.
> >
> > Appreciate any help!
> >
> > Best regards,
> > Rolf
>
> puts DATA.read.scan(/^@begin Objects(.*?)^@end;/m).flatten.
>  map{|s| s.strip.to_a}.flatten.map{|s| s.split(/"/)[1]}
>
> __END__
> Save Format v3.0(19990112)
> @begin Libraries
>  "felles.pbl" "";
> @end;
> @begin Objects
>  "n_cst_xml_utils.sru" "felles.pbl";
>  "n_melding.sru" "felles.pbl";
> @end;
> @begin Libraries
>  "felles.pbl" "";
> @end;
> @begin Objects
>  "n_cst_xml_utils.sru" "felles.pbl";
>  "n_melding.sru" "felles.pbl";
> @end;
>
>
>

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