[refactoring] update ast structure of "Unset" node

pkg/ast/node.go

@@ -783,7 +783,12 @@ func (n *StmtTry) Accept(v NodeVisitor) {
 // StmtUnset node
 type StmtUnset struct {
 	Node
-	Vars []Vertex
+	UnsetTkn            *token.Token
+	OpenParenthesisTkn  *token.Token
+	Vars                []Vertex
+	SeparatorTkns       []*token.Token
+	CloseParenthesisTkn *token.Token
+	SemiColonTkn        *token.Token
 }
 
 func (n *StmtUnset) Accept(v NodeVisitor) {

pkg/ast/visitor/filter_tokens.go

@@ -204,3 +204,12 @@ func (v *FilterTokens) StmtEcho(n *ast.StmtEcho) {
 func (v *FilterTokens) StmtInlineHtml(n *ast.StmtInlineHtml) {
 	n.InlineHtmlTkn = nil
 }
+
+func (v *FilterTokens) StmtUnset(n *ast.StmtUnset) {
+	n.UnsetTkn = nil
+	n.OpenParenthesisTkn = nil
+	n.SeparatorTkns = nil
+	n.CloseParenthesisTkn = nil
+	n.SemiColonTkn = nil
+	n.SemiColonTkn = nil
+}

pkg/printer/printer.go

@@ -2905,24 +2905,12 @@ func (p *Printer) printStmtTry(n ast.Vertex) {
 	p.printFreeFloating(nn, token.End)
 }
 
-func (p *Printer) printStmtUnset(n ast.Vertex) {
-	nn := n.(*ast.StmtUnset)
-	p.printFreeFloating(nn, token.Start)
-
-	p.write([]byte("unset"))
-	p.printFreeFloating(nn, token.Unset)
-	p.write([]byte("("))
-	p.joinPrint(",", nn.Vars)
-	p.printFreeFloating(nn, token.VarList)
-	p.write([]byte(")"))
-	p.printFreeFloating(nn, token.CloseParenthesisToken)
-
-	p.printFreeFloating(nn, token.SemiColon)
-	if n.GetNode().Tokens.IsEmpty() {
-		p.write([]byte(";"))
-	}
-
-	p.printFreeFloating(nn, token.End)
+func (p *Printer) printStmtUnset(n *ast.StmtUnset) {
+	p.printToken(n.UnsetTkn, "unset")
+	p.printToken(n.OpenParenthesisTkn, "(")
+	p.printSeparatedList(n.Vars, n.SeparatorTkns, ",")
+	p.printToken(n.CloseParenthesisTkn, ")")
+	p.printToken(n.SemiColonTkn, ";")
 }
 
 func (p *Printer) printStmtUse(n *ast.StmtUse) {