Deal with Flutter web stacktraces

Author: haarts

lib/src/printers/pretty_printer.dart

@@ -42,7 +42,17 @@ class PrettyPrinter extends LogPrinter {
     Level.wtf: '👾 ',
   };
 
-  static final stackTraceRegex = RegExp(r'#[0-9]+[\s]+(.+) \(([^\s]+)\)');
+  /// Matches a stacktrace line as generated on Android/iOS devices.
+  /// For example:
+  /// #1      Logger.log (package:logger/src/logger.dart:115:29)
+  static final _deviceStackTraceRegex =
+      RegExp(r'#[0-9]+[\s]+(.+) \(([^\s]+)\)');
+
+  /// Matches a stacktrace line as generated by Flutter web.
+  /// For example:
+  /// packages/logger/src/printers/pretty_printer.dart 91:37
+  static final _webStackTraceRegex =
+      RegExp(r'^((packages|dart-sdk)\/[^\s]+\/)');
 
   static DateTime _startTime;
 
@@ -110,22 +120,16 @@ class PrettyPrinter extends LogPrinter {
 
   String formatStackTrace(StackTrace stackTrace, int methodCount) {
     var lines = stackTrace.toString().split('\n');
-
     var formatted = <String>[];
     var count = 0;
     for (var line in lines) {
-      var match = stackTraceRegex.matchAsPrefix(line);
-      if (match != null) {
-        if (match.group(2).startsWith('package:logger')) {
-          continue;
-        }
-        var newLine = '#$count   ${match.group(1)} (${match.group(2)})';
-        formatted.add(newLine.replaceAll('<anonymous closure>', '()'));
-        if (++count == methodCount) {
-          break;
-        }
-      } else {
-        formatted.add(line);
+      if (_discardDeviceStacktraceLine(line) ||
+          _discardWebStacktraceLine(line)) {
+        continue;
+      }
+      formatted.add('#$count   ${line.replaceFirst(RegExp(r'#\d+\s+'), '')}');
+      if (++count == methodCount) {
+        break;
       }
     }
 
@@ -136,6 +140,23 @@ class PrettyPrinter extends LogPrinter {
     }
   }
 
+  bool _discardDeviceStacktraceLine(String line) {
+    var match = _deviceStackTraceRegex.matchAsPrefix(line);
+    if (match == null) {
+      return false;
+    }
+    return match.group(2).startsWith('package:logger');
+  }
+
+  bool _discardWebStacktraceLine(String line) {
+    var match = _webStackTraceRegex.matchAsPrefix(line);
+    if (match == null) {
+      return false;
+    }
+    return match.group(1).startsWith('packages/logger') ||
+        match.group(1).startsWith('dart-sdk/lib');
+  }
+
   String getTime() {
     String _threeDigits(int n) {
       if (n >= 100) return '$n';