[es7] implement |do| expressions proposal

src/prettyprinter.cc

Index: src/prettyprinter.cc
diff --git a/src/prettyprinter.cc b/src/prettyprinter.cc
index 3efdfb61143f02272772b7070ae586c2328074c8..7df0e01808feec4f2366e33a35feebaed4448937 100644
--- a/src/prettyprinter.cc
+++ b/src/prettyprinter.cc
@@ -228,6 +228,9 @@ void CallPrinter::VisitClassLiteral(ClassLiteral* node) {
 void CallPrinter::VisitNativeFunctionLiteral(NativeFunctionLiteral* node) {}
 
 
+void CallPrinter::VisitDoExpression(DoExpression* node) { Find(node->block()); }
+
+
 void CallPrinter::VisitConditional(Conditional* node) {
   Find(node->condition());
   Find(node->then_expression());
@@ -701,6 +704,13 @@ void PrettyPrinter::VisitNativeFunctionLiteral(NativeFunctionLiteral* node) {
 }
 
 
+void PrettyPrinter::VisitDoExpression(DoExpression* node) {
+  Print("(do {");
+  PrintStatements(node->block()->statements());
+  Print("})");
+}
+
+
 void PrettyPrinter::VisitConditional(Conditional* node) {
   Visit(node->condition());
   Print(" ? ");
@@ -1426,6 +1436,12 @@ void AstPrinter::VisitNativeFunctionLiteral(NativeFunctionLiteral* node) {
 }
 
 
+void AstPrinter::VisitDoExpression(DoExpression* node) {
+  IndentedScope indent(this, "DO EXPRESSION", node->position());
+  PrintStatements(node->block()->statements());
+}
+
+
 void AstPrinter::VisitConditional(Conditional* node) {
   IndentedScope indent(this, "CONDITIONAL", node->position());
   PrintIndentedVisit("CONDITION", node->condition());