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if ( $range > 500 )
{
    WAT_OP();
...
{
    complete_tree_op();
}

my @action_tree = ( { test => sub { $_[0] >= 300 && $_[0] <= 400 },
                      action => sub { print "GUDNITES\n"; CORE::exit(0
+) } },
                    { test => sub { $_[0] >= 425 && $_[0] <= 500 },
...
{
    $_->{test}->($signal) && $_->{action}->() for @action_tree;
}