use strict;
use warnings;

use Parse::RecDescent ();
use Data::Dumper qw( Dumper );

my $grammar = <<'__END_OF_GRAMMAR__';

   {
      use strict;
      use warnings;
   }

   test : <rulevar: local %data >
        | expr(s) /^\Z/ { \%data }

   expr : name '=' /\d+/
          { $data{ $item{name} } = $item[-1]; 1 }

   name : /\w+/

__END_OF_GRAMMAR__

my $parser = new Parse::RecDescent($grammar) or die;
my $data = $parser->test("x = 1 y = 2 z = 3") or die;
print Dumper $data;