#!/opt/perl5/bin/perl -w
use strict;
use Parse::RecDescent;
use Data::Dumper;
use vars qw($grammar);

BEGIN{ $::RD_AUTOACTION = q{ [@item[1..$#item]] }; }

$grammar = q(
        file: section(s)
        section: header pair(s?)
        header:   /\[(\w+)\]/ { $1 }
        pair:     /(\w+)\s?=\s?(\w+)(\s+[\#\;][\w\s]+)?\n/
          {
            if(!defined $3){
              [$1,$2];
            }else{
              [$1,$2,$3];
            }
          }
        );

my $parser= Parse::RecDescent->new($grammar);

my $text;

{
 $/=undef;
 $text=<DATA>;
}

my $tree=$parser->file($text);
my ($key,$x,%Config);
my $config=deparse($tree);

print Dumper($config);

sub deparse{
  my $aoa=shift;
  for $x (0..$#{$aoa}){
    if(ref($aoa->[$x])){
       $key=deparse($aoa->[$x]);
    }else{
      if(scalar(@$aoa) == 2){
        chomp $aoa->[0];
        $y=$aoa->[0];
        $Config{$y}=undef;
        return $key;
      }elsif(scalar(@$aoa) == 3){
        if(defined $aoa->[2]){
          $aoa->[2]=~s/^\s+[\;\#]//;
          chomp $aoa->[2];
          $Config{$key}{$aoa->[0]}=[$aoa->[1],$aoa->[2]];
          return;
        }else{
          $Config{$key}{$aoa->[0]}=$aoa->[1];
          return;
        }
      }
    }
  }
  my $return=\%Config;
  return $return;
}

__DATA__
[Section1]
key1=value1
key2=value2   #Comment2
key3=value3

[Section2]
key4=value4
key5=value5
key6=value6   ;Comment 6