Version 1.1.0-dev.5.5

dart/editor/tools/plugins/com.google.dart.tools.debug.core/src/com/google/dart/tools/debug/core/dartium/BreakpointManager.java

 /*
  * Copyright (c) 2012, 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
@@ skipping 171 matching lines @@
     Path path = new Path(regex);
     int i = 0;
     if (regex.indexOf(LIB_DIRECTORY_PATH) != -1) {
       // remove all segments after "lib", they show path in the package
       while (i < path.segmentCount() && !path.segment(i).equals("lib")) {
         i++;
       }
     } else {
       i = 1;
     }
-    String filePath = new Path(regex).removeLastSegments(path.segmentCount() - (i + 1)).toString();
+    String filePath = regex;
+    if (path.segmentCount() > i + 1) {
+      filePath = new Path(regex).removeLastSegments(path.segmentCount() - (i + 1)).toString();
+    }
 
     String packagePath = resolvePathToPackage(resource, filePath);
     if (packagePath != null) {
       packagePath += "/" + path.removeFirstSegments(i + 1);
     }
     return packagePath;
   }
 
   @VisibleForTesting
   protected String resolvePathToPackage(IFile resource, String filePath) {
@@ skipping 154 matching lines @@
     }
 
     if (container.getParent() instanceof IWorkspaceRoot) {
       return false;
     }
 
     return isPubLib(container.getParent());
   }
 
 }