fixes #40, extension methods for primitive types

lib/src/js/nodes.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;
 
 abstract class NodeVisitor<T> {
   T visitProgram(Program node);
 
   T visitBlock(Block node);
@@ skipping 1065 matching lines @@
 
   /**
    * Use a different precedence level depending on whether the value contains a
    * dot to ensure we generate `(1).toString()` and `1.0.toString()`.
    */
   int get precedenceLevel => value.contains('.') ? PRIMARY : UNARY;
 }
 
 class ArrayInitializer extends Expression {
   final List<Expression> elements;
+  final bool multiline;
 
-  ArrayInitializer(this.elements);
+  ArrayInitializer(this.elements, {this.multiline: false});
 
   accept(NodeVisitor visitor) => visitor.visitArrayInitializer(this);
 
   void visitChildren(NodeVisitor visitor) {
     for (Expression element in elements) element.accept(visitor);
   }
 
   ArrayInitializer _clone() => new ArrayInitializer(elements);
 
   int get precedenceLevel => PRIMARY;
 }
 
 /**
  * An empty place in an [ArrayInitializer].
  * For example the list [1, , , 2] would contain two holes.
  */
 class ArrayHole extends Expression {
   accept(NodeVisitor visitor) => visitor.visitArrayHole(this);
 
   void visitChildren(NodeVisitor visitor) {}
 
   ArrayHole _clone() => new ArrayHole();
 
   int get precedenceLevel => PRIMARY;
 }
 
 class ObjectInitializer extends Expression {
   final List<Property> properties;
-  /**
-   * If set to true, forces a vertical layout when using the [Printer].
-   * Otherwise, layout will be vertical if and only if any [properties]
-   * are [FunctionExpression]s.
-   */
-  final bool _vertical;
-  bool get vertical {
-    return _vertical || properties.any((p) => p.value is FunctionExpression);
-  }
+  final bool _multiline;
 
   /**
    * Constructs a new object-initializer containing the given [properties].
    */
-  ObjectInitializer(this.properties, {vertical: false}) : _vertical = vertical;
+  ObjectInitializer(this.properties, {multiline: false})
+      : _multiline = multiline;
 
   accept(NodeVisitor visitor) => visitor.visitObjectInitializer(this);
 
   void visitChildren(NodeVisitor visitor) {
     for (Property init in properties) init.accept(visitor);
   }
 
   ObjectInitializer _clone() => new ObjectInitializer(properties);
 
   int get precedenceLevel => PRIMARY;
+  /**
+   * If set to true, forces a vertical layout when using the [Printer].
+   * Otherwise, layout will be vertical if and only if any [properties]
+   * are [FunctionExpression]s.
+   */
+  bool get multiline {
+    return _multiline || properties.any((p) => p.value is FunctionExpression);
+  }
 }
 
 class Property extends Node {
   final Expression name;
   final Expression value;
 
   Property(this.name, this.value);
 
   accept(NodeVisitor visitor) => visitor.visitProperty(this);
 
@@ skipping 278 matching lines @@
   final Expression expression;
 
   CommentExpression(this.comment, this.expression);
 
   int get precedenceLevel => PRIMARY;
   accept(NodeVisitor visitor) => visitor.visitCommentExpression(this);
   CommentExpression _clone() => new CommentExpression(comment, expression);
 
   void visitChildren(NodeVisitor visitor) => expression.accept(visitor);
 }