From: w_a_x_man <w_a_x_man@...>
Date: 2010-07-06T03:25:04+09:00
Subject: Re: File data extraction

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;