Add a couple functions to package:stack_trace.

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:pathos/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].*) \((.+):(\d+):(\d+)\)|(.+):(\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+)$');
 
+// 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 {
   /// The URI of the file in which the code is located.
   ///
   /// This URI will usually have the scheme `dart`, `file`, `http`, or `https`.
   final Uri uri;
 
   /// The line number on which the code location is located.
@@ skipping 100 matching lines @@
       member = "<fn>";
     } else if (match[2] != null) {
       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 this package's string representation of a stack frame.
+  factory Frame.parseFriendly(String frame) {
+    var match = _friendlyFrame.firstMatch(frame);
+    if (match == null) {
+      throw new FormatException(
+          "Couldn't parse package:stack_trace stack trace line '$frame'.");
+    }
+
+    var uri = Uri.parse(match[1]);
+    // If there's no scheme, this is a relative URI. We should interpret it as
+    // relative to the current working directory.
+    if (uri.scheme == '') {
+      uri = path.toUri(path.absolute(path.fromUri(uri)));
+    }
+
+    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';
 }