Implement delete on File objects.

runtime/bin/file_impl.dart

 // Copyright (c) 2011, 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.
 
 class _FileInputStream implements FileInputStream {
   _FileInputStream(File file) {
     _file = new File(file.name);
     _file.openSync();
   }
 
@@ skipping 318 matching lines @@
   _CreateOperation(String this._name);
 
   void execute(ReceivePort port) {
     _replyPort.send(_File._checkedCreate(_name), port.toSendPort());
   }
 
   String _name;
 }
 
 
+class _DeleteOperation extends _FileOperation {
+  _DeleteOperation(String this._name);
+
+  void execute(ReceivePort port) {
+    _replyPort.send(_File._checkedDelete(_name), port.toSendPort());
+  }
+
+  String _name;
+}
+
+
 class _ExitOperation extends _FileOperation {
   void execute(ReceivePort port) {
     port.close();
   }
 }
 
 
 class _FileOperationIsolate extends Isolate {
   _FileOperationIsolate() : super.heavy();
 
@@ skipping 72 matching lines @@
       native "File_ReadList";
   static int _writeByte(int id, int value) native "File_WriteByte";
   static int _writeList(int id, List<int> buffer, int offset, int bytes)
       native "File_WriteList";
   static int _writeString(int id, String string) native "File_WriteString";
   static int _position(int id) native "File_Position";
   static int _setPosition(int id, int position) native "File_SetPosition";
   static int _length(int id) native "File_Length";
   static int _flush(int id) native "File_Flush";
   static bool _create(String name) native "File_Create";
+  static bool _delete(String name) native "File_Delete";
   static String _fullPath(String name) native "File_FullPath";
 
   static int _checkReadWriteListArguments(int length, int offset, int bytes) {
     if (offset < 0) return offset;
     if (bytes < 0) return bytes;
     if ((offset + bytes) > length) return offset + bytes;
     return 0;
   }
 
   static int _checkedOpen(String name, bool writable) {
     if (name is !String || writable is !bool) return 0;
     return _open(name, writable);
   }
 
   static bool _checkedCreate(String name) {
     if (name is !String) return false;
     return _create(name);
   }
 
+  static bool _checkedDelete(String name) {
+    if (name is !String) return false;
+    return _delete(name);
+  }
+
   static int _checkedWriteString(int id, String string) {
     if (string is !String) return -1;
     return _writeString(id, string);
   }
 
   static String _checkedFullPath(String name) {
     if (name is !String) return null;
     return _fullPath(name);
   }
 
@@ skipping 40 matching lines @@
     if (_asyncUsed) {
       throw new FileIOException(
           "Mixed use of synchronous and asynchronous API");
     }
     bool created = _checkedCreate(_name);
     if (!created) {
       throw new FileIOException("Cannot create file: $_name");
     }
   }
 
+  void delete() {
+    _asyncUsed = true;
+    var handler = (_deleteHandler != null) ? _deleteHandler : () => null;
+    var handleDeleteResult = (created, ignored) {
+      if (created) {
+        handler();
+      } else if (_errorHandler != null) {
+        _errorHandler("Cannot delete file: $_name");
+      }
+    };
+    var operation = new _DeleteOperation(_name);
+    _scheduler.enqueue(operation, handleDeleteResult);
+  }
+
+  void deleteSync() {
+    if (_asyncUsed) {
+      throw new FileIOException(
+          "Mixed use of synchronous and asynchronous API");
+    }
+    bool deleted = _checkedDelete(_name);
+    if (!deleted) {
+      throw new FileIOException("Cannot delete file: $_name");
+    }
+  }
+
   void open([bool writable = false]) {
     _asyncUsed = true;
     var handler = (_openHandler != null) ? _openHandler : () => null;
     var handleOpenResult = (result, ignored) {
       if (result != 0) {
         _id = result;
         handler();
       } else if (_errorHandler != null) {
         _errorHandler("Cannot open file: $_name");
       }
@@ skipping 370 matching lines @@
   }
 
   void set existsHandler(void handler(bool exists)) {
     _existsHandler = handler;
   }
 
   void set createHandler(void handler()) {
     _createHandler = handler;
   }
 
+  void set deleteHandler(void handler()) {
+    _deleteHandler = handler;
+  }
+
   void set openHandler(void handler()) {
     _openHandler = handler;
   }
 
   void set closeHandler(void handler()) {
     _closeHandler = handler;
   }
 
   void set readByteHandler(void handler(int byte)) {
     _readByteHandler = handler;
@@ skipping 32 matching lines @@
   }
 
   String _name;
   int _id;
   bool _asyncUsed;
 
   _FileOperationScheduler _scheduler;
 
   var _existsHandler;
   var _createHandler;
+  var _deleteHandler;
   var _openHandler;
   var _closeHandler;
   var _readByteHandler;
   var _readListHandler;
   var _noPendingWriteHandler;
   var _positionHandler;
   var _setPositionHandler;
   var _lengthHandler;
   var _flushHandler;
   var _fullPathHandler;
   var _errorHandler;
 }