fixes #40, extension methods for primitive types

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 876 matching lines @@
     }
     out(node.value);
   }
 
   visitLiteralNull(LiteralNull node) {
     out("null");
   }
 
   visitArrayInitializer(ArrayInitializer node) {
     out("[");
+    indentMore();
+    var multiline = node.multiline;
     List<Expression> elements = node.elements;
     for (int i = 0; i < elements.length; i++) {
       Expression element = elements[i];
       if (element is ArrayHole) {
         // Note that array holes must have a trailing "," even if they are
         // in last position. Otherwise `[,]` (having length 1) would become
         // equal to `[]` (the empty array)
         // and [1,,] (array with 1 and a hole) would become [1,] = [1].
         out(",");
         continue;
       }
-      if (i != 0) spaceOut();
+      if (i != 0 && !multiline) spaceOut();
+      if (multiline) {
+        forceLine();
+        indent();
+      }
       visitNestedExpression(element, ASSIGNMENT,
                             newInForInit: false, newAtStatementBegin: false);
       // We can skip the trailing "," for the last element (since it's not
       // an array hole).
       if (i != elements.length - 1) out(",");
     }
+    indentLess();
+    if (multiline) {
+      lineOut();
+      indent();
+    }
     out("]");
   }
 
   visitArrayHole(ArrayHole node) {
     throw "Unreachable";
   }
 
   visitObjectInitializer(ObjectInitializer node) {
     List<Property> properties = node.properties;
     out("{");
     indentMore();
 
-    var isOneLiner = !node.vertical;
+    var multiline = node.multiline;
     for (int i = 0; i < properties.length; i++) {
       if (i != 0) {
         out(",");
-        if (isOneLiner) spaceOut();
+        if (!multiline) spaceOut();
       }
-      if (!isOneLiner) {
+      if (multiline) {
         forceLine();
         indent();
       }
       visit(properties[i]);
     }
     indentLess();
-    if (!isOneLiner) {
+    if (multiline) {
       lineOut();
       indent();
     }
     out("}");
   }
 
   visitProperty(Property node) {
     propertyNameOut(node.name);
     out(":");
     spaceOut();
@@ skipping 480 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);
   }
 }