Ignore some stacktrace lines when using vanilla Dart in the browser

Thanks @gmpassos!

Author: haarts

lib/src/printers/pretty_printer.dart

@@ -55,6 +55,13 @@ class PrettyPrinter extends LogPrinter {
   static final _webStackTraceRegex =
       RegExp(r'^((packages|dart-sdk)\/[^\s]+\/)');
 
+  /// Matches a stacktrace line as generated by browser Dart.
+  /// For example:
+  /// dart:sdk_internal
+  /// package:logger/src/logger.dart
+  static final _browserStackTraceRegex =
+      RegExp(r'^(?:package:)?(dart:[^\s]+|[^\s]+)');
+
   static DateTime _startTime;
 
   /// Amount of [StackTrace] lines to show with message (non-error log).
@@ -147,7 +154,8 @@ class PrettyPrinter extends LogPrinter {
     var count = 0;
     for (var line in lines) {
       if (_discardDeviceStacktraceLine(line) ||
-          _discardWebStacktraceLine(line)) {
+          _discardWebStacktraceLine(line) ||
+          _discardBrowserStacktraceLine(line)) {
         continue;
       }
       formatted.add('#$count   ${line.replaceFirst(RegExp(r'#\d+\s+'), '')}');
@@ -180,6 +188,15 @@ class PrettyPrinter extends LogPrinter {
         match.group(1).startsWith('dart-sdk/lib');
   }
 
+  bool _discardBrowserStacktraceLine(String line) {
+    var match = _browserStackTraceRegex.matchAsPrefix(line);
+    if (match == null) {
+      return false;
+    }
+    return match.group(1).startsWith('package:logger') ||
+        match.group(1).startsWith('dart:');
+  }
+
   String getTime() {
     String _threeDigits(int n) {
       if (n >= 100) return '$n';