[refactoring] update ast structure of "ExprMethodCall" and "ExprPropertyFetch" nodes

pkg/ast/node.go

@@ -1215,9 +1215,12 @@ func (n *ExprList) Accept(v NodeVisitor) {
 // ExprMethodCall node
 type ExprMethodCall struct {
 	Node
-	Var          Vertex
-	Method       Vertex
-	ArgumentList *ArgumentList
+	Var                 Vertex
+	ObjectOperatorTkn   *token.Token
+	Method              Vertex
+	OpenParenthesisTkn  *token.Token
+	Arguments           []Vertex
+	CloseParenthesisTkn *token.Token
 }
 
 func (n *ExprMethodCall) Accept(v NodeVisitor) {
@@ -1288,8 +1291,9 @@ func (n *ExprPrint) Accept(v NodeVisitor) {
 // ExprPropertyFetch node
 type ExprPropertyFetch struct {
 	Node
-	Var      Vertex
-	Property Vertex
+	Var               Vertex
+	ObjectOperatorTkn *token.Token
+	Property          Vertex
 }
 
 func (n *ExprPropertyFetch) Accept(v NodeVisitor) {

pkg/ast/traverser/dfs.go

@@ -1396,10 +1396,12 @@ func (t *DFS) Traverse(n ast.Vertex) {
 			t.Traverse(nn.Method)
 			t.visitor.Leave("Method", true)
 		}
-		if nn.ArgumentList != nil {
-			t.visitor.Enter("ArgumentList", true)
-			t.Traverse(nn.ArgumentList)
-			t.visitor.Leave("ArgumentList", true)
+		if nn.Arguments != nil {
+			t.visitor.Enter("Arguments", false)
+			for _, c := range nn.Arguments {
+				t.Traverse(c)
+			}
+			t.visitor.Leave("Arguments", false)
 		}
 	case *ast.ExprNew:
 		if nn == nil {