Add a couple functions to package:stack_trace.

pkg/stack_trace/lib/src/trace.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 trace;
 
 import 'dart:collection';
 import 'dart:math' as math;
 
 import 'frame.dart';
 import 'lazy_trace.dart';
+import 'utils.dart';
+import 'vm_trace.dart';
 
 final _terseRegExp = new RegExp(r"(-patch)?(/.*)?$");
 
 /// A RegExp to match Firefox's stack traces.
 ///
 /// Firefox's trace frames start with the name of the function in which the
 /// error occurred, possibly including its parameters inside `()`. For example,
 /// `.VW.call$0("arg")@http://pub.dartlang.org/stuff.dart.js:560`.
 final _firefoxTrace = new RegExp(r"^([.0-9A-Za-z_$/<]*|\(.*\))*@");
 
+/// A RegExp to match this package's stack traces.
+final _friendlyTrace = new RegExp(r"^[^\s]+( \d+:\d+)?\s+[^\s]+($|\n)");
+
 /// A stack trace, comprised of a list of stack frames.
 class Trace implements StackTrace {
   /// The stack frames that comprise this stack trace.
   final List<Frame> frames;
 
   /// Returns a human-readable representation of [stackTrace]. If [terse] is
   /// set, this folds together multiple stack frames from the Dart core
   /// libraries, so that only the core library method directly called from user
   /// code is visible (see [Trace.terse]).
   static String format(StackTrace stackTrace, {bool terse: true}) {
@@ skipping 31 matching lines @@
   }
 
   /// Parses a string representation of a stack trace.
   ///
   /// [trace] should be formatted in the same way as a Dart VM or browser stack
   /// trace.
   factory Trace.parse(String trace) {
     if (trace.isEmpty) return new Trace(<Frame>[]);
     if (trace.startsWith("Error\n")) return new Trace.parseV8(trace);
     if (trace.contains(_firefoxTrace)) return new Trace.parseFirefox(trace);
+    if (trace.contains(_friendlyTrace)) return new Trace.parseFriendly(trace);
 
     // Default to parsing the stack trace as a VM trace. This is also hit on IE
     // and Safari, where the stack trace is just an empty string (issue 11257).
     return new Trace.parseVM(trace);
   }
 
   /// Parses a string representation of a Dart VM stack trace.
   Trace.parseVM(String trace)
       : this(trace.trim().split("\n").map((line) => new Frame.parseVM(line)));
 
   /// Parses a string representation of a Chrome/V8 stack trace.
   Trace.parseV8(String trace)
       : this(trace.split("\n").skip(1).map((line) => new Frame.parseV8(line)));
 
   /// Parses a string representation of a Firefox stack trace.
   Trace.parseFirefox(String trace)
       : this(trace.trim().split("\n")
           .map((line) => new Frame.parseFirefox(line)));
 
+  /// Parses this package's a string representation of a stack trace.
+  Trace.parseFriendly(String trace)
+      : this(trace.trim().split("\n")
+          .map((line) => new Frame.parseFriendly(line)));
+
   /// Returns a new [Trace] comprised of [frames].
   Trace(Iterable<Frame> frames)
       : frames = new UnmodifiableListView<Frame>(frames.toList());
 
-  // TODO(nweiz): Keep track of which [Frame]s are part of the partial stack
-  // trace and only print them.
-  /// Returns a string representation of this stack trace.
+  /// Returns a VM-style [StackTrace] object.
   ///
-  /// This is identical to [toString]. It will not be formatted in the manner of
-  /// native stack traces.
-  String get stackTrace => toString();
-
-  /// Returns a string representation of this stack trace.
-  ///
-  /// This is identical to [toString]. It will not be formatted in the manner of
-  /// native stack traces.
-  String get fullStackTrace => toString();
+  /// The return value's [toString] method will always return a string
+  /// representation in the Dart VM's stack trace format, regardless of what
+  /// platform is being used.
+  StackTrace get vmTrace => new VMTrace(frames);
 
   /// Returns a terser version of [this].
   ///
   /// This is accomplished by folding together multiple stack frames from the
   /// core library, as in [foldFrames]. Remaining core library frames have their
   /// libraries, "-patch" suffixes, and line numbers removed.
   Trace get terse {
     return new Trace(foldFrames((frame) => frame.isCore).frames.map((frame) {
       if (!frame.isCore) return frame;
       var library = frame.library.replaceAll(_terseRegExp, '');
@@ skipping 23 matching lines @@
   }
 
   /// Returns a human-readable string representation of [this].
   String toString() {
     // Figure out the longest path so we know how much to pad.
     var longest = frames.map((frame) => frame.location.length)
         .fold(0, math.max);
 
     // Print out the stack trace nicely formatted.
     return frames.map((frame) {
-      return '${_padRight(frame.location, longest)}  ${frame.member}\n';
+      return '${padRight(frame.location, longest)}  ${frame.member}\n';
     }).join();
   }
 }
-
-/// Returns [string] with enough spaces added to the end to make it [length]
-/// characters long.
-String _padRight(String string, int length) {
-  if (string.length >= length) return string;
-
-  var result = new StringBuffer();
-  result.write(string);
-  for (var i = 0; i < length - string.length; i++) {
-    result.write(' ');
-  }
-
-  return result.toString();
-}