added print_to_string helper method

diff --git a/lib/output.js b/lib/output.js
index f83a5c8..307e7cb 100644 (file)
--- a/lib/output.js
+++ b/lib/output.js
@@ -296,6 +296,12 @@ function OutputStream(options) {
         });
     };
 
+    AST_Node.DEFMETHOD("print_to_string", function(options){
+        var s = OutputStream(options);
+        this.print(s);
+        return s.get();
+    });
+
     function PARENS(nodetype, func) {
         nodetype.DEFMETHOD("needs_parens", func);
     };