php8.1: added intersection types support (#29)

pkg/ast/ast.go

@@ -15,6 +15,7 @@ type Visitor interface {
 	Argument(n *Argument)
 	MatchArm(n *MatchArm)
 	Union(n *Union)
+	Intersection(n *Intersection)
 	Attribute(n *Attribute)
 	AttributeGroup(n *AttributeGroup)
 

pkg/ast/node.go

@@ -50,6 +50,21 @@ func (n *Union) GetPosition() *position.Position {
 	return n.Position
 }
 
+// Intersection node is Expr&Expr1&...
+type Intersection struct {
+	Position      *position.Position
+	Types         []Vertex
+	SeparatorTkns []*token.Token
+}
+
+func (n *Intersection) Accept(v Visitor) {
+	v.Intersection(n)
+}
+
+func (n *Intersection) GetPosition() *position.Position {
+	return n.Position
+}
+
 // Parameter node
 type Parameter struct {
 	Position     *position.Position