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- pre processor
- processor
- post processor
- engine

sub engines {
     
...
    }
    return @engines;
}

sub new {
     
...
 
    return $dt;
}

sub all {
     
...
        return \@subs;
    };
}

sub _engine {
     
...
 
    return $cref;
}

sub all {
     
...
     
    $self->run($p);
}

sub run {
 
...
 
    return $struct;
}

    my $engine = $self->_engine($p, $subs);
 
...
        $subs = $engine->($p, $subs);
        $self->{write_file_contents} = $p->{write_file_contents};
    }