I have searched google and thepen to no avail (my guess is that I am not searching for the right stuff) thus I appeal to you...
I am writting a function where I will be given a list of items that are selected. Each of these items (save one) has a dependency on another of those items. I need to sort them in order of dependency.

Example:
Object   => Dependency
1        => undef (no dependency)
2        => 4
3        => 5
4        => 3
5        => 1

[download]
I am given 1,2,3,4,5 and I need back 1,5,3,4,2

Here is my failed attempt at solving this... Could I ask that someone show me either what I have missed that makes it loop endlessly or a far simpler way of doing this..

%ArgHash is structued $ArgHash{$version}=csv,list,of,selected
and bubble sort stinks but I cannot think of a different way to do this...I am unenlightened
sub sortPatch
 {
  my %ArgHash=@_;

  my $version = join('',keys(%ArgHash));
  my @tbs = split(/\,/,$ArgHash{$version});

  my @LoopControl=@tbs;
  my @returning;

  foreach (@tbs,(1))  # this should make it go one more time... right?
   {
    my ($previous,$patchlist);
    foreach my $patch (@LoopControl)
     {
      undef($previous);
      undef($patchlist);
      $previous=$PatchInfo::patch{$version}{$patch}{'PREVIOUS'} if (de
+fined($PatchInfo::patch{$version}{$patch}{'PREVIOUS'}));
      $patchlist = join('|',@returning);

      if (defined($previous))
       {
        if (($previous ne '') and (not($previous =~ /$patchlist/)))
         {
          my $selected = join('|',@tbs);
          if (($previous =~ /$selected/) and ($selected ne ''))
           {
            push(@returning,$previous);
           }
         }
       }
      push(@returning,$patch);
     }
    @LoopControl=();
    @LoopControl=@returning;
   }

  return @returning;
 }

[download]

jcpunk
help?

In reply to Sorting by association, a tail of dependency resolving gone nowhere by jcpunk

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