#!/usr/bin/env perl

# Update the S/D and M/S ratios in a table. This script can be used with:
#   perl -i update-ratios <filename>
# to modify the file in-place, instead of getting the results on stdout.
#
# Copyright (C) 2012 Vincent Lefevre <vincent@vinc17.net>
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 3
# of the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, see http://www.gnu.org/licenses/
# or write to the Free Software Foundation, Inc., 51 Franklin St,
# Fifth Floor, Boston, MA 02110-1301, USA.

use strict;

# UTF-8 settings.
use utf8;                            # for the characters in the script.
use open ':encoding(UTF-8)';         # for the file arguments.
binmode STDIN, ':encoding(UTF-8)';   # for stdin.
binmode STDOUT, ':encoding(UTF-8)';  # for stdout.

my $nrx = qr/(\d*)\.(\d\d)/;
while (<>)
  {
    /^(│ 1 [246] [56]  [-246] │ *$nrx +$nrx +$nrx +$nrx *│).{11}│/
      or print, next;
    # Make sure that everything is exactly representable as a binary
    # floating-point number before the division.
    my $sipe = (($6.$7) + ($8.$9))/2;
    printf "%s %3.1f   %3.1f │\n", $1, $sipe / ($2.$3), ($4.$5) / $sipe;
  }

# $Id: update-ratios 56954 2012-12-11 15:07:51Z vinc17/ypig $