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¶