sub argout {
  my $dfa = shift;      # $dfa here is equivalent to 'this' in Java
  my $temp = { type => 'ARG', value => $dfa->{buffer} };
  $dfa->{buffer} = '';
  push(@{$dfa->{output}}, $temp);
}

# example of constructing a DFA object and calling argout:

my $dfa = DFA->new();
$dfa->argout();