Parser changes to support new export directive

compiler/java/com/google/dart/compiler/ast/DartExportDirective.java

Index: compiler/java/com/google/dart/compiler/ast/DartExportDirective.java
===================================================================
--- compiler/java/com/google/dart/compiler/ast/DartExportDirective.java	(revision 0)
+++ compiler/java/com/google/dart/compiler/ast/DartExportDirective.java	(revision 0)
@@ -0,0 +1,41 @@
+// 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.
+
+package com.google.dart.compiler.ast;
+
+import java.util.List;
+
+/**
+ * Implements the export directive.
+ */
+public class DartExportDirective extends DartDirective {
+  private DartStringLiteral libraryUri;
+
+  private NodeList<ImportCombinator> combinators = new NodeList<ImportCombinator>(this);
+
+  public DartExportDirective(DartStringLiteral libraryUri, List<ImportCombinator> combinators) {
+    this.libraryUri = becomeParentOf(libraryUri);
+    this.combinators.addAll(combinators);
+  }
+
+  public DartStringLiteral getLibraryUri() {
+    return libraryUri;
+  }
+
+  public List<ImportCombinator> getCombinators() {
+    return combinators;
+  }
+
+  @Override
+  public void visitChildren(ASTVisitor<?> visitor) {
+    super.visitChildren(visitor);
+    safelyVisitChild(libraryUri, visitor);
+    combinators.accept(visitor);
+  }
+
+  @Override
+  public <R> R accept(ASTVisitor<R> visitor) {
+    return visitor.visitExportDirective(this);
+  }
+}