source: mp3-find/tags/0.06/bin/cql

#!/usr/bin/perl -w
use strict;

package MyVisitor;
use base qw( CQL::Visitor );

sub term {
    my ($self,$node) = @_;
    # do something to the node
    print $node->{qualifier}, " ", $node->{term}, "\n";
}

package main;

use CQL::Parser;
use YAML;

my $p = CQL::Parser->new;

my $cql = <<END;
artist = (ilyaimy or rob) and title = angel
END

my $root = $p->parse($cql);

#print Dump($root);

my $visitor = MyVisitor->new;
$visitor->visit($root);