initial sync*, part of #221

lib/src/js/printer.dart

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 part of js_ast;
 
 
 class JavaScriptPrintingOptions {
   final bool shouldCompressOutput;
   final bool minifyLocalVariables;
@@ skipping 491 matching lines @@
     }
   }
 
   visitLabeledStatement(LabeledStatement node) {
     outIndent("${node.label}:");
     blockBody(node.body, needsSeparation: false, needsNewline: true);
   }
 
   void functionOut(Fun fun, Node name) {
     out("function");
+    if (fun.isGenerator) out("*");
     if (name != null) {
       out(" ");
       // Name must be a [Decl]. Therefore only test for primary expressions.
       visitNestedExpression(name, PRIMARY,
                             newInForInit: false, newAtStatementBegin: false);
     }
     localNamer.enterScope(fun);
     out("(");
     if (fun.params != null) {
       visitCommaSeparated(fun.params, PRIMARY,
@@ skipping 241 matching lines @@
         break;
       default:
         out(op);
     }
     visitNestedExpression(unary.argument, unary.precedenceLevel,
                           newInForInit: inForInit, newAtStatementBegin: false);
   }
 
   visitSpread(Spread unary) => visitPrefix(unary);
 
+  visitYield(Yield yield) {
+    out(yield.star ? "yield* " : "yield ");
+    visitNestedExpression(yield.value, yield.precedenceLevel,
+        newInForInit: inForInit, newAtStatementBegin: false);
+  }
+
   visitPostfix(Postfix postfix) {
     visitNestedExpression(postfix.argument, LEFT_HAND_SIDE,
                           newInForInit: inForInit,
                           newAtStatementBegin: atStatementBegin);
     out(postfix.op);
   }
 
   visitThis(This node) {
     out("this");
   }
@@ skipping 242 matching lines @@
   }
 
   visitMethod(Method node) {
     if (node.isStatic) {
       out('static ');
     }
     if (node.isGetter) {
       out('get ');
     } else if (node.isSetter) {
       out('set ');
+    } else if (node.function.isGenerator) {
+      out('*');
     }
     propertyNameOut(node.name, inMethod: true);
 
     var fun = node.function;
     localNamer.enterScope(fun);
     out("(");
     if (fun.params != null) {
       visitCommaSeparated(fun.params, SPREAD,
           newInForInit: false, newAtStatementBegin: false);
     }
@@ skipping 406 matching lines @@
     declare(node.name);
     node.function.accept(this);
   }
 
   visitClassExpression(ClassExpression node) {
     declare(node.name);
     if (node.heritage != null) node.heritage.accept(this);
     for (Method element in node.methods) element.accept(this);
   }
 }