[refactoring] update ast structure of "Break", "Continue" nodes

pkg/ast/node.go

@@ -191,7 +191,9 @@ func (n *StmtAltForeach) Accept(v NodeVisitor) {
 // StmtBreak node
 type StmtBreak struct {
 	Node
-	Expr Vertex
+	BreakTkn     *token.Token
+	Expr         Vertex
+	SemiColonTkn *token.Token
 }
 
 func (n *StmtBreak) Accept(v NodeVisitor) {
@@ -314,7 +316,9 @@ func (n *StmtConstant) Accept(v NodeVisitor) {
 // StmtContinue node
 type StmtContinue struct {
 	Node
-	Expr Vertex
+	ContinueTkn  *token.Token
+	Expr         Vertex
+	SemiColonTkn *token.Token
 }
 
 func (n *StmtContinue) Accept(v NodeVisitor) {

pkg/ast/visitor/filter_tokens.go

@@ -163,3 +163,13 @@ func (v *FilterTokens) StmtDefault(n *ast.StmtDefault) {
 	n.DefaultTkn = nil
 	n.CaseSeparatorTkn = nil
 }
+
+func (v *FilterTokens) StmtBreak(n *ast.StmtBreak) {
+	n.BreakTkn = nil
+	n.SemiColonTkn = nil
+}
+
+func (v *FilterTokens) StmtContinue(n *ast.StmtContinue) {
+	n.ContinueTkn = nil
+	n.SemiColonTkn = nil
+}