NAME

       CQL::Visitor - visit nodes in a CQL parse tree

SYNOPSIS

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

           sub term {
               my ($self,$node) = @_;
               # do something to the node
           }

           # later on

           my $parser = CQL::Parser->new();
           my $root = $parser->parse($cql);

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

DESCRIPTION

       CQL::Visitor provides a simple interface for visiting nodes in your parse tree.  It could
       be useful if you want to do something like change a query like this:

           dc.title=foo and dc.creator=bar

           into

           title=foo and creator=bar

       Or some similar procedure. You simply create a new subclass of CQL::Visitor and override
       the appropriate method, such as term(). Every term that is encountered during the
       traversal will be handed off to your term() method.

       Note: at the moment only term() is supported because that's what was needed, but if you
       need other ones feel free to add them, or ask for them.

METHODS

   new()
   visit()
       Call this to traverse your parse tree, starting at the root.

   term()
       Your subclass should override this, and do something meaningful with the CQL::TermNode
       object.