Fix a URI related problem on windows.

editor/tools/plugins/com.google.dart.tools.core/src/com/google/dart/tools/core/internal/util/ResourceUtil.java

 /*
  * Copyright (c) 2011, the Dart project authors.
  * 
  * Licensed under the Eclipse Public License v1.0 (the "License"); you may not use this file except
  * in compliance with the License. You may obtain a copy of the License at
  * 
  * http://www.eclipse.org/legal/epl-v10.html
  * 
  * Unless required by applicable law or agreed to in writing, software distributed under the License
  * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
  * or implied. See the License for the specific language governing permissions and limitations under
  * the License.
  */
 package com.google.dart.tools.core.internal.util;
 
 import com.google.dart.compiler.Source;
 import com.google.dart.compiler.SystemLibraryManager;
+import com.google.dart.tools.core.DartCore;
 import com.google.dart.tools.core.utilities.net.URIUtilities;
 
 import org.eclipse.core.resources.IFile;
 import org.eclipse.core.resources.IWorkspaceRoot;
 import org.eclipse.core.resources.ResourcesPlugin;
 
 import java.io.File;
 import java.net.URI;
 
 /**
  * Utilities for mapping {@link Source} to {@link File} to {@link IFile}
  */
 public class ResourceUtil {
   public static IWorkspaceRoot root = ResourcesPlugin.getWorkspace().getRoot();
 
   /**
    * Answer the file for the specified Dart source or <code>null</code> if none
    */
   public static File getFile(Source source) {
     if (source == null) {
       return null;
     }
+
+    URI uri = URIUtilities.safelyResolveDartUri(source.getUri());
+
     try {
-      URI uri = URIUtilities.safelyResolveDartUri(source.getUri());
       if (uri.isAbsolute() && "file".equals(uri.getScheme())) {
         return new File(uri);
       }
       String relativePath = uri.getPath();
       return new File(new File(".").getAbsoluteFile(), relativePath);
     } catch (IllegalArgumentException ex) {
-      // Thrown if the url was not a legal file url.
+      DartCore.logError("Illegal file URI: " + uri, ex);
+
       return null;
     }
   }
 
   /**
    * Answer the Eclipse resource associated with the specified file or <code>null</code> if none
    */
   public static IFile getResource(File file) {
     IFile[] resources = ResourceUtil.getResources(file);
     if (resources != null) {
@@ skipping 57 matching lines @@
     if (SystemLibraryManager.isDartUri(uri)) {
       return null;
     }
     return root.findFilesForLocationURI(uri);
   }
 
   // No instances
   private ResourceUtil() {
   }
 }