#!/usr/bin/perl

use strict;
use warnings;

use Test::More;

package TestParser;
use base qw( Parser::MGC );

sub parse
{
   my $self = shift;

   $self->sequence_of( 
      sub {
         $self->any_of(
            sub { $self->expect( qr/[a-z]+/ ) . "/" . $self->scope_level },
            sub { $self->scope_of( "(", \&parse, ")" ) },
         );
      },
   );
}

package main;

my $parser = TestParser->new;

is_deeply( $parser->from_string( "a" ), [ "a/0" ], 'a' );
is_deeply( $parser->from_string( "(b)" ), [ [ "b/1" ] ], '(b)' );
is_deeply( $parser->from_string( "c (d) e" ), [ "c/0", [ "d/1" ], "e/0" ], 'c (d) e' );

done_testing;