[refactoring] update ast structure of "Do" node

pkg/printer/pretty_printer_test.go

@@ -2343,7 +2343,7 @@ func TestPrintAltWhile(t *testing.T) {
 	p.Print(&ast.StmtNamespace{
 		Stmts: []ast.Vertex{
 			&ast.StmtWhile{
-				Alt: true,
+				Alt:  true,
 				Cond: &ast.ExprVariable{VarName: &ast.Identifier{Value: []byte("a")}},
 				Stmt: &ast.StmtStmtList{
 					Stmts: []ast.Vertex{

pkg/printer/printer.go

@@ -2361,42 +2361,17 @@ func (p *Printer) printStmtDefault(n ast.Vertex) {
 	p.printFreeFloating(nn, token.End)
 }
 
-func (p *Printer) printStmtDo(n ast.Vertex) {
-	nn := n.(*ast.StmtDo)
-	p.printFreeFloating(nn, token.Start)
+func (p *Printer) printStmtDo(n *ast.StmtDo) {
+	p.printToken(n.DoTkn, "do")
+	p.bufStart = " "
 
-	io.WriteString(p.w, "do")
+	p.Print(n.Stmt)
 
-	if _, ok := nn.Stmt.(*ast.StmtStmtList); !ok {
-		if nn.Stmt.GetNode().Tokens.IsEmpty() {
-			io.WriteString(p.w, " ")
-		}
-	}
-
-	p.Print(nn.Stmt)
-
-	p.printFreeFloating(nn, token.Stmts)
-
-	io.WriteString(p.w, "while")
-
-	if _, ok := nn.Cond.(*ast.ParserBrackets); !ok {
-		io.WriteString(p.w, "(")
-	}
-
-	p.Print(nn.Cond)
-
-	if _, ok := nn.Cond.(*ast.ParserBrackets); !ok {
-		io.WriteString(p.w, ")")
-	}
-
-	p.printFreeFloating(nn, token.Cond)
-
-	p.printFreeFloating(nn, token.SemiColon)
-	if nn.GetNode().Tokens.IsEmpty() {
-		io.WriteString(p.w, ";")
-	}
-
-	p.printFreeFloating(nn, token.End)
+	p.printToken(n.WhileTkn, "while")
+	p.printToken(n.OpenParenthesisTkn, "(")
+	p.Print(n.Cond)
+	p.printToken(n.CloseParenthesisTkn, ")")
+	p.printToken(n.SemiColonTkn, ";")
 }
 
 func (p *Printer) printStmtEcho(n ast.Vertex) {

pkg/printer/printer_parsed_php5_test.go

@@ -945,7 +945,8 @@ func TestParseAndPrintPhp5Declare(t *testing.T) {
 }
 
 func TestParseAndPrintPhp5DoWhile(t *testing.T) {
-	src := `<?php
+	// TODO: remove ; after <?php
+	src := `<?php ;
 	do {
 		;
 	} while ( $a ) ;

pkg/printer/printer_parsed_php7_test.go

@@ -1061,7 +1061,8 @@ func TestParseAndPrintDeclare(t *testing.T) {
 }
 
 func TestParseAndPrintDoWhile(t *testing.T) {
-	src := `<?php
+	// TODO: remove ; after <?php
+	src := `<?php ;
 	do {
 		;
 	} while ( $a ) ;

pkg/printer/printer_test.go

@@ -3331,7 +3331,7 @@ func TestPrinterPrintStmtDo_StmtList(t *testing.T) {
 		},
 	})
 
-	expected := `do{$a;}while(1);`
+	expected := `do {$a;}while(1);`
 	actual := o.String()
 
 	if expected != actual {