Write custom URI-parser, to avoid using regexp.

tests/corelib/uri_file_test.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.
 
 import "package:expect/expect.dart";
 
 testFileUri() {
   final unsupported = new UnsupportedError("");
 
   var tests = [
@@ skipping 240 matching lines @@
     } else {
       Expect.throws(() => uri.toFilePath(windows: true),
                     (e) => e is UnsupportedError);
     }
   }
 
   check("file:///path?query");
   check("file:///path#fragment");
   check("file:///path?query#fragment");
   check("file://host/path", windowsOk: true);
-  check("file://user@password:host/path");
+  check("file://user:password@host/path", windowsOk: true);
 }
 
 main() {
   testFileUri();
   testFileUriWindowsSlash();
   testFileUriDriveLetter();
   testFileUriWindowsWin32Namespace();
   testFileUriResolve();
   testFileUriIllegalCharacters();
   testFileUriIllegalDriveLetter();
   testAdditionalComponents();
 }