40 lines
560 B
Go
40 lines
560 B
Go
package node
|
|
|
|
type Nullable struct {
|
|
position *Position
|
|
Expr Node
|
|
}
|
|
|
|
func NewNullable(Expression Node) *Nullable {
|
|
return &Nullable{
|
|
nil,
|
|
Expression,
|
|
}
|
|
}
|
|
|
|
func (n *Nullable) Attributes() map[string]interface{} {
|
|
return nil
|
|
}
|
|
|
|
func (n *Nullable) Position() *Position {
|
|
return n.position
|
|
}
|
|
|
|
func (n *Nullable) SetPosition(p *Position) Node {
|
|
n.position = p
|
|
return n
|
|
}
|
|
|
|
func (n *Nullable) Walk(v Visitor) {
|
|
if v.EnterNode(n) == false {
|
|
return
|
|
}
|
|
|
|
if n.Expr != nil {
|
|
vv := v.GetChildrenVisitor("Expr")
|
|
n.Expr.Walk(vv)
|
|
}
|
|
|
|
v.LeaveNode(n)
|
|
}
|