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#!/usr/bin/env perl
# $Id$
#extract-factors.pl: extract only the desired factors from a factored corpus
#usage: extract-factors corpusfile factor-index factor-index ... > outfile
#factor indices start at 0
#factor indices too large ought to be ignored
use warnings;
use strict;
my ($filename, @factors) = @ARGV;
my %indices = map {$_ => 1} @factors;
open(INFILE, "<$filename") or die "couldn't open '$filename' for read: $!\n";
while(my $line = <INFILE>)
{
chop $line;
print join(' ', map {my $i = 0; join('|', grep($indices{$i++}, split(/\|/, $_)))} split(/\s+/, $line)) . "\n";
}
close(INFILE);
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