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pkg/analyzer/lib/file_system/memory_file_system.dart

 // Copyright (c) 2014, 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.
 
 library memory_file_system;
 
 import 'dart:async';
 import 'dart:collection';
 
 import 'package:analyzer/src/generated/engine.dart' show TimestampedData;
@@ skipping 13 matching lines @@
       new HashMap<String, _MemoryResource>();
   final Map<String, String> _pathToContent = new HashMap<String, String>();
   final Map<String, int> _pathToTimestamp = new HashMap<String, int>();
   final Map<String, List<StreamController<WatchEvent>>> _pathToWatchers =
       new HashMap<String, List<StreamController<WatchEvent>>>();
   int nextStamp = 0;
 
   @override
   Context get pathContext => posix;
 
+  /**
+   * Delete the file with the given path.
+   */
   void deleteFile(String path) {
     _checkFileAtPath(path);
     _pathToResource.remove(path);
     _pathToContent.remove(path);
     _pathToTimestamp.remove(path);
     _notifyWatchers(path, ChangeType.REMOVE);
   }
 
+  /**
+   * Delete the folder with the given path
+   * and recurively delete nested files and folders.
+   */
+  void deleteFolder(String path) {
+    _checkFolderAtPath(path);
+    _MemoryFolder folder = _pathToResource[path];
+    for (Resource child in folder.getChildren()) {
+      if (child is File) {
+        deleteFile(child.path);
+      } else if (child is Folder) {
+        deleteFolder(child.path);
+      } else {
+        throw 'failed to delete resource: $child';
+      }
+    }
+    _pathToResource.remove(path);
+    _pathToContent.remove(path);
+    _pathToTimestamp.remove(path);
+    _notifyWatchers(path, ChangeType.REMOVE);
+  }
+
   @override
   Resource getResource(String path) {
     path = posix.normalize(path);
     Resource resource = _pathToResource[path];
     if (resource == null) {
       resource = new _MemoryFile(this, path);
     }
     return resource;
   }
 
@@ skipping 16 matching lines @@
   File newDummyLink(String path) {
     path = posix.normalize(path);
     newFolder(posix.dirname(path));
     _MemoryDummyLink link = new _MemoryDummyLink(this, path);
     _pathToResource[path] = link;
     _pathToTimestamp[path] = nextStamp++;
     _notifyWatchers(path, ChangeType.ADD);
     return link;
   }
 
-  File newFile(String path, String content) {
+  File newFile(String path, String content, [int stamp]) {
     path = posix.normalize(path);
     newFolder(posix.dirname(path));
     _MemoryFile file = new _MemoryFile(this, path);
     _pathToResource[path] = file;
     _pathToContent[path] = content;
-    _pathToTimestamp[path] = nextStamp++;
+    _pathToTimestamp[path] = stamp != null ? stamp : nextStamp++;
     _notifyWatchers(path, ChangeType.ADD);
     return file;
   }
 
   Folder newFolder(String path) {
     path = posix.normalize(path);
     if (!path.startsWith('/')) {
       throw new ArgumentError("Path must start with '/'");
     }
     _MemoryResource resource = _pathToResource[path];
@@ skipping 16 matching lines @@
   }
 
   void _checkFileAtPath(String path) {
     _MemoryResource resource = _pathToResource[path];
     if (resource is! _MemoryFile) {
       throw new ArgumentError(
           'File expected at "$path" but ${resource.runtimeType} found');
     }
   }
 
+  void _checkFolderAtPath(String path) {
+    _MemoryResource resource = _pathToResource[path];
+    if (resource is! _MemoryFolder) {
+      throw new ArgumentError(
+          'Folder expected at "$path" but ${resource.runtimeType} found');
+    }
+  }
+
   void _notifyWatchers(String path, ChangeType changeType) {
     _pathToWatchers.forEach(
         (String watcherPath, List<StreamController<WatchEvent>> streamControllers) {
       if (posix.isWithin(watcherPath, path)) {
         for (StreamController<WatchEvent> streamController in streamControllers)
             {
           streamController.add(new WatchEvent(changeType, path));
         }
       }
     });
@@ skipping 247 matching lines @@
   bool operator ==(other) {
     if (runtimeType != other.runtimeType) {
       return false;
     }
     return path == other.path;
   }
 
   @override
   String toString() => path;
 }