Properly parse friendly stack traces without columns.

pkg/stack_trace/lib/src/frame.dart

 // Copyright (c) 2013, 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 frame;
 
 
 import 'package:path/path.dart' as path;
 
 import 'trace.dart';
 
 // #1      Foo._bar (file:///home/nweiz/code/stuff.dart:42:21)
 final _vmFrame = new RegExp(
     r'^#\d+\s+([^\s].*) \((.+?):(\d+)(?::(\d+))?\)$');
 
 //     at VW.call$0 (http://pub.dartlang.org/stuff.dart.js:560:28)
 //     at http://pub.dartlang.org/stuff.dart.js:560:28
 final _v8Frame = new RegExp(
     r'^\s*at (?:([^\s].*?)(?: \[as [^\]]+\])? '
     r'\((.+):(\d+):(\d+)\)|(.+):(\d+):(\d+))$');
 
 // .VW.call$0@http://pub.dartlang.org/stuff.dart.js:560
 // .VW.call$0("arg")@http://pub.dartlang.org/stuff.dart.js:560
 // .VW.call$0/name<@http://pub.dartlang.org/stuff.dart.js:560
 final _firefoxFrame = new RegExp(
-    r'^([^@(/]*)(?:\(.*\))?(/[^<]*<?)?(?:\(.*\))?@(.*):(\d+)$');
+    r'^([^@(/]*)(?:\(.*\))?((?:/[^/]*)*)(?:\(.*\))?@(.*):(\d+)$');
 
 // foo/bar.dart 10:11 in Foo._bar
 // http://dartlang.org/foo/bar.dart in Foo._bar
 final _friendlyFrame = new RegExp(
     r'^([^\s]+)(?: (\d+):(\d+))?\s+([^\d][^\s]*)$');
 
 final _initialDot = new RegExp(r"^\.");
 
 /// A single stack frame. Each frame points to a precise location in Dart code.
 class Frame {
@@ skipping 115 matching lines @@
   /// Parses a string representation of a Firefox stack frame.
   factory Frame.parseFirefox(String frame) {
     var match = _firefoxFrame.firstMatch(frame);
     if (match == null) {
       throw new FormatException(
           "Couldn't parse Firefox stack trace line '$frame'.");
     }
 
     var uri = Uri.parse(match[3]);
     var member = match[1];
-    if (member == "") {
-      member = "<fn>";
-    } else if (match[2] != null) {
-      member = "$member.<fn>";
-    }
+    member += new List.filled('/'.allMatches(match[2]).length, ".<fn>").join();
+    if (member == '') member = '<fn>';
+
     // Some Firefox members have initial dots. We remove them for consistency
     // with other platforms.
     member = member.replaceFirst(_initialDot, '');
     return new Frame(uri, int.parse(match[4]), null, member);
   }
 
   /// Parses a string representation of a Safari stack frame.
   ///
   /// Safari 6+ frames look just like Firefox frames. Prior to Safari 6, stack
   /// traces can't be retrieved.
@@ skipping 16 matching lines @@
 
     var line = match[2] == null ? null : int.parse(match[2]);
     var column = match[3] == null ? null : int.parse(match[3]);
     return new Frame(uri, line, column, match[4]);
   }
 
   Frame(this.uri, this.line, this.column, this.member);
 
   String toString() => '$location in $member';
 }