28     function visit_opt(&$query) {  argument
29         $this->dispatch($query['lhs']);
30         $this->dispatch($query['rhs']);
36     function visit_and(&$query) {  argument
37         $this->dispatch($query['lhs']);
38         $this->dispatch($query['rhs']);
44     function visit_filter(&$query) {  argument
45         $this->dispatch($query['lhs']);
46         foreach($query['rhs'] as &$filter) {
54     function visit_minus(&$query) {  argument
55         $this->dispatch($query['lhs']);
56         $this->dispatch($query['rhs']);
63     function visit_union(&$query) {  argument
64         $this->dispatch($query['lhs']);
65         $this->dispatch($query['rhs']);
72     function visit_select(&$query) {  argument
73         $this->dispatch($query['group']);
76     function dispatch(&$query) {  argument
77         switch($query['type']) {
79                 return $this->visit_select($query);
81                 return $this->visit_union($query);
83                 return $this->visit_minus($query);
85                 return $this->visit_opt($query);
87                 return $this->visit_filter($query);
89                 return $this->visit_tp($query);
91                 return $this->visit_and($query);
99     function visit(&$query) {  argument
100         $this->dispatch($query);