Starting ES6 classes

lib/output.js

@@ -502,6 +502,12 @@ function OutputStream(options) {
         return first_in_statement(output);
     });
 
+    // Not a class, though. It can be alone in a statement although
+    // it extends from AST_Object.
+    PARENS(AST_Class, function() {
+        return false;
+    });
+
     PARENS([ AST_Unary, AST_Undefined ], function(output){
         var p = output.parent();
         return p instanceof AST_PropAccess && p.expression === this;
@@ -1188,6 +1194,31 @@ function OutputStream(options) {
         });
         else output.print("{}");
     });
+    DEFPRINT(AST_Class, function(self, output){
+        output.print("class");
+        output.space();
+        if (self.name) {
+            self.name.print(output);
+            output.space();
+        }
+        if (self.extends) {
+            output.print("extends");
+            output.space();
+            self.extends.print(output);
+            output.space();
+        }
+        if (self.properties.length > 0) output.with_block(function(){
+            self.properties.forEach(function(prop, i){
+                if (i) {
+                    output.newline();
+                }
+                output.indent();
+                prop.print(output);
+            });
+            output.newline();
+        });
+        else output.print("{}");
+    });
     DEFPRINT(AST_ObjectKeyVal, function(self, output){
         var key = self.key;
         var quote = self.quote;