add stack trace detection

dart/lib/src/utils/stack_trace_utils.dart

@@ -0,0 +1,25 @@
+import 'package:meta/meta.dart';
+
+@internal
+extension StackTraceUtils on String {
+  bool isStackTrace() {
+    final frameNumberPrefix = RegExp(r'^#\d+', multiLine: true);
+    final matchesFrameNumber = frameNumberPrefix.hasMatch(this);
+
+    final fileAndLineNumberSuffix =
+        RegExp(r'.dart:\d+:\d+\)$', multiLine: true);
+    final matchesFileAndLineNumber = fileAndLineNumberSuffix.hasMatch(this);
+
+    final abs = RegExp(r'\s(abs)\s');
+    final virt = RegExp(r'\s(virt)\s');
+    final matchesAbsAndVirt = abs.hasMatch(this) & virt.hasMatch(this);
+
+    final hexSuffix = RegExp(r'\+0(x)\w+$', multiLine: true);
+    final matchesHexSuffix = hexSuffix.hasMatch(this);
+
+    final isStackTrace = matchesFrameNumber & matchesFileAndLineNumber;
+    final isObfuscatedStackTrace =
+        matchesFrameNumber & (matchesAbsAndVirt || matchesHexSuffix);
+    return isStackTrace || isObfuscatedStackTrace;
+  }
+}

dart/test/utils/stack_trace_utils_test.dart

@@ -0,0 +1,74 @@
+import 'package:sentry/src/utils/stack_trace_utils.dart';
+import 'package:test/test.dart';
+
+void main() {
+  final dartStackTrace = '''
+randomPrefix
+#0      main (file:///Users/denis/Repos/other/dart-stacktrace/main.dart:2:20)
+#1      _delayEntrypointInvocation.<anonymous closure> (dart:isolate-patch/isolate_patch.dart:296:19)
+#2      _RawReceivePort._handleMessage (dart:isolate-patch/isolate_patch.dart:189:12)
+randomSuffix
+    ''';
+
+  final flutterStackTrace = '''
+randomPrefix
+flutter: #0      MainScaffold.build.<anonymous closure> (package:sentry_flutter_example/main.dart:142:47)
+#1      _InkResponseState.handleTap (package:flutter/src/material/ink_well.dart:1154:21)
+#2      GestureRecognizer.invokeCallback (package:flutter/src/gestures/recognizer.dart:275:24)
+#3      TapGestureRecognizer.handleTapUp (package:flutter/src/gestures/tap.dart:654:11)
+#4      BaseTapGestureRecognizer._checkUp (package:flutter/src/gestures/tap.dart:311:5)
+#5      BaseTapGestureRecognizer.acceptGesture (package:flutter/src/gestures/tap.dart:281:7)
+#6      GestureArenaManager.sweep (package:flutter/src/gestures/arena.dart:167:27)
+#7      GestureBinding.handleEvent (package:flutter/src/gestures/binding.dart:469:20)
+#8      GestureBinding.dispatchEvent (package:flutter/src/gestures/binding.dart:445:22)
+#9      RendererBinding.dispatchEvent (package:flutter/src/rendering/binding.dart:331:11)
+#10     GestureBinding._handlePointerEventImmediately (package:flutter/src/gestures/binding.dart:400:7)<…>
+randomSuffix
+    ''';
+
+  final flutterObfuscatedStackTrace = '''
+#00 abs 00000075266c2fbf virt 0000000000697fbf _kDartIsolateSnapshotInstructions+0x37e63f
+#1 abs 000000752685211f virt 000000000082711f _kDartIsolateSnapshotInstructions+0x50d79f
+#2 abs 0000007526851cb3 virt 0000000000826cb3 _kDartIsolateSnapshotInstructions+0x50d333
+#3 abs 0000007526851c63 virt 0000000000826c63 _kDartIsolateSnapshotInstructions+0x50d2e3
+#4 abs 0000007526851bf3 virt 0000000000826bf3 _kDartIsolateSnapshotInstructions+0x50d273
+    ''';
+
+  test('dart stack trace detected', () {
+    expect(dartStackTrace.isStackTrace(), isTrue);
+  });
+
+  test('flutter stack trace detected', () {
+    expect(flutterStackTrace.isStackTrace(), isTrue);
+  });
+
+  test('flutter obfuscated stack trace detected', () {
+    expect(flutterObfuscatedStackTrace.isStackTrace(), isTrue);
+  });
+
+  test('stack trace not detected with frame number only', () {
+    expect('#0'.isStackTrace(), isFalse);
+  });
+
+  test('stack trace not detected with file name and line number only', () {
+    expect('foo.dart:9000:1)'.isStackTrace(), isFalse);
+  });
+
+  test('stack trace not detected abs only', () {
+    expect(' abs '.isStackTrace(), isFalse);
+  });
+
+  test('stack trace not detected virt only', () {
+    expect(' virt '.isStackTrace(), isFalse);
+  });
+
+  test('stack trace not detected abs & virt only', () {
+    expect(
+        ' abs 00000075266c2fbf virt 0000000000697fbf'.isStackTrace(), isFalse);
+  });
+
+  test('stack trace not detected hex suffix only', () {
+    expect(
+        '_kDartIsolateSnapshotInstructions+0x50d273'.isStackTrace(), isFalse);
+  });
+}

flutter/example/lib/main.dart

@@ -137,6 +137,14 @@ class MainScaffold extends StatelessWidget {
         child: Column(
           children: [
             const Center(child: Text('Trigger an action:\n')),
+            ElevatedButton(
+              onPressed: () {
+                final stackTrace = StackTrace.current;
+                NetworkError(type: NetworkErrorType.unknown, error: Instance of 'iH')
+                print(stackTrace);
+              },
+              child: const Text('StackTrace'),
+            ),
             ElevatedButton(
               onPressed: () => sqfliteTest(),
               child: const Text('sqflite'),