dart:io | Add "followLinks" optional parameter to Directory.list, let it return Link objects when f…

sdk/lib/io/directory_impl.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 dart.io;
 
 class _Directory implements Directory {
   static const CREATE_REQUEST = 0;
   static const DELETE_REQUEST = 1;
   static const EXISTS_REQUEST = 2;
   static const CREATE_TEMP_REQUEST = 3;
   static const LIST_REQUEST = 4;
   static const RENAME_REQUEST = 5;
 
   static const SUCCESS_RESPONSE = 0;
   static const ILLEGAL_ARGUMENT_RESPONSE = 1;
   static const OSERROR_RESPONSE = 2;
 
   _Directory(String this._path);
   _Directory.fromPath(Path path) : this(path.toNativePath());
   _Directory.current() : this(_current());
 
   external static String _current();
   external static _createTemp(String template);
   external static int _exists(String path);
   external static _create(String path);
   external static _delete(String path, bool recursive);
   external static _rename(String path, String newPath);
-  external static List _list(String path, bool recursive);
+  external static List _list(String path, bool recursive, bool followLinks);
   external static SendPort _newServicePort();
 
   Future<bool> exists() {
     _ensureDirectoryService();
     List request = new List(2);
     request[0] = EXISTS_REQUEST;
     request[1] = _path;
     return _directoryService.call(request).then((response) {
       if (_isErrorResponse(response)) {
         throw _exceptionOrErrorFromResponse(response, "Exists failed");
@@ skipping 179 matching lines @@
     if (_path is !String || newPath is !String) {
       throw new ArgumentError();
     }
     var result = _rename(_path, newPath);
     if (result is OSError) {
       throw new DirectoryIOException("Rename failed", _path, result);
     }
     return new Directory(newPath);
   }
 
-  Stream<FileSystemEntity> list({bool recursive: false}) {
+  Stream<FileSystemEntity> list({bool recursive: false,
+                                 bool followLinks: true}) {
     const int LIST_FILE = 0;
     const int LIST_DIRECTORY = 1;
-    const int LIST_ERROR = 2;
-    const int LIST_DONE = 3;
+    const int LIST_LINK = 2;
+    const int LIST_ERROR = 3;
+    const int LIST_DONE = 4;
 
     const int RESPONSE_TYPE = 0;
     const int RESPONSE_PATH = 1;
     const int RESPONSE_COMPLETE = 1;
     const int RESPONSE_ERROR = 2;
 
     var controller = new StreamController<FileSystemEntity>();
 
-    List request = [ _Directory.LIST_REQUEST, path, recursive ];
+    List request = [ _Directory.LIST_REQUEST, path, recursive, followLinks ];
     ReceivePort responsePort = new ReceivePort();
     // Use a separate directory service port for each listing as
     // listing operations on the same directory can run in parallel.
     _Directory._newServicePort().send(request, responsePort.toSendPort());
     responsePort.receive((message, replyTo) {
       if (message is !List || message[RESPONSE_TYPE] is !int) {
         responsePort.close();
         controller.addError(new DirectoryIOException("Internal error"));
         return;
       }
       switch (message[RESPONSE_TYPE]) {
         case LIST_FILE:
           controller.add(new File(message[RESPONSE_PATH]));
           break;
         case LIST_DIRECTORY:
           controller.add(new Directory(message[RESPONSE_PATH]));
           break;
+        case LIST_LINK:
+          controller.add(new Link(message[RESPONSE_PATH]));
+          break;
         case LIST_ERROR:
           var errorType =
               message[RESPONSE_ERROR][_ERROR_RESPONSE_ERROR_TYPE];
           if (errorType == _ILLEGAL_ARGUMENT_RESPONSE) {
             controller.addError(new ArgumentError());
           } else if (errorType == _OSERROR_RESPONSE) {
             var responseError = message[RESPONSE_ERROR];
             var err = new OSError(
                 responseError[_OSERROR_RESPONSE_MESSAGE],
                 responseError[_OSERROR_RESPONSE_ERROR_CODE]);
@@ skipping 10 matching lines @@
         case LIST_DONE:
           responsePort.close();
           controller.close();
           break;
       }
     });
 
     return controller.stream;
   }
 
-  List listSync({bool recursive: false}) {
+  List listSync({bool recursive: false, bool followLinks: true}) {
     if (_path is! String || recursive is! bool) {
       throw new ArgumentError();
     }
-    return _list(_path, recursive);
+    return _list(_path, recursive, followLinks);
   }
 
   String get path => _path;
 
   String toString() => "Directory: '$path'";
 
   bool _isErrorResponse(response) {
     return response is List && response[0] != _SUCCESS_RESPONSE;
   }
 
@@ skipping 13 matching lines @@
 
   void _ensureDirectoryService() {
     if (_directoryService == null) {
       _directoryService = _newServicePort();
     }
   }
 
   final String _path;
   SendPort _directoryService;
 }