Greetings monks, long time lurker, first post. Typically I can googlefoo my way around to find a solution but I'm not sure how to go about that for this problem. I have a flat file consisting of item and item dependencies. But I need to be able to track it back to find all the potential dependencies, basically following the rabbit down the hole.

Plain Example: if item1 requires item2 and item3, and item3 requires item4 -> then item1 also requires item4.

I'm working with around 120k rows so I know the relationships are going to be rather complex, however a task is a task.

Relevant Code: 

#load hash after some parsing in a foreach loop
push(@{$jobs{$JobName}{1}}, $blah);    
...

$level =1;
$nextlevel = 2;
while ($level <= 10) {
    foreach my $dep (keys %jobs) { 
        foreach (@{$jobs{$dep}{$level}}) {
          print "$dep $level   $_\n";
        push( @{$jobs{$dep}{$nextlevel}},@{$jobs{$_}{$level}} );
        next if ${$jobs{$_}{$level}}[0] eq "$dep";
        last if ${$jobs{$_}{$level}}[0] eq ''; #this cancels the loop 
+if any of the dependencies don't have dependencies, which is a proble
+m if there's additional 
        }
    
    
    }
        $level++;
    $nextlevel++;
}

[download]

So one of the problems is the last statement is prematurely breaking the loop if X dep doesn't have a dep, but there's additional deps in the array. Without that terminate feature the script will run until the while loop has been fulfilled, I have no way of breaking out once I have tracked all the dependencies down. As for CPAN and modules, given my environment I'm very limited on what I can use.

Example Data(first column is job, rest are dependencies): 

job1,
job2,job1,
job3,job2
job4,job2
job5,job2,job4
job6,jobz
joba,job4,jobb
jobz,jobbc,job2

[download]

Any guidance will be greatly appreciated!

I figured it out, made some loop structure changes, thanks VinsWorldcom for your replay

while ($level <= 10) {
    foreach $dep (keys %jobs) { 
        foreach (@{$jobs{$dep}{$level}}) {
          print "Key:$dep Value:$_  Lvl:$level  Seen:$seen{$_}\n";
        if ($seen{$_} eq '') { push( @{$jobs{$dep}{$nextlevel}},@{$job
+s{$_}{$level}} ); }
        $seen{$_} = 1;
        next if ${$jobs{$_}{$level}}[0] eq "$dep";
        last if $seen{$_} == 1;
        }
    
    }
    %seen = '';
    @temparray = '';
    $level++;
    $nextlevel++;
}

[download]

In reply to Multi level dependency structure by MH1

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