Refactor code formatting and clean up whitespace in source files

- Removed unnecessary blank lines and improved code readability across multiple files, including main.dart, legacy_api.dart, subscription_manager.dart, and v2ray_url_parser.dart.
- Ensured consistent formatting in the vpnclient_engine.dart file to enhance maintainability.

Author: Anton-Dodonov

example/lib/main.dart

@@ -209,8 +209,7 @@ class _VpnExamplePageState extends State<VpnExamplePage> {
                     Row(
                       mainAxisAlignment: MainAxisAlignment.spaceBetween,
                       children: [
-                        const Text('Status:',
-                            style: TextStyle(fontSize: 16)),
+                        const Text('Status:', style: TextStyle(fontSize: 16)),
                         Row(
                           children: [
                             Container(
@@ -319,4 +318,3 @@ class _VpnExamplePageState extends State<VpnExamplePage> {
     super.dispose();
   }
 }
-

lib/src/legacy_api.dart

@@ -6,22 +6,22 @@ import 'subscription_manager.dart';
 /// Provides static methods matching the old API
 class VPNclientEngine {
   static final VpnClientEngine _engine = VpnClientEngine.instance;
-  
+
   /// Clear all subscriptions
   static void ClearSubscriptions() {
     _engine.clearSubscriptions();
   }
-  
+
   /// Add subscription
   static void addSubscription({required String subscriptionURL, String? name}) {
     _engine.addSubscription(subscriptionURL: subscriptionURL, name: name);
   }
-  
+
   /// Update subscription
   static Future<bool> updateSubscription({required int subscriptionIndex}) {
     return _engine.updateSubscription(subscriptionIndex: subscriptionIndex);
   }
-  
+
   /// Ping server
   static Future<void> pingServer({
     required int subscriptionIndex,
@@ -32,10 +32,10 @@ class VPNclientEngine {
       serverIndex: index,
     );
   }
-  
+
   /// Stream of ping results
   static Stream<PingResult> get onPingResult => _engine.onPingResult;
-  
+
   /// Connect to server
   static Future<void> connect({
     required int subscriptionIndex,
@@ -46,12 +46,12 @@ class VPNclientEngine {
       serverIndex: serverIndex,
     );
   }
-  
+
   /// Disconnect
   static Future<void> disconnect() async {
     await _engine.disconnect();
   }
-  
+
   /// Get engine instance for direct access
   static VpnClientEngine get instance => _engine;
 }
@@ -60,4 +60,3 @@ class VPNclientEngine {
 class VpnclientEngineFlutter {
   static VpnClientEngine get instance => VpnClientEngine.instance;
 }
-

lib/src/subscription_manager.dart

@@ -10,31 +10,32 @@ class Subscription {
   final String? name;
   final DateTime? lastUpdate;
   List<ServerConfig> servers;
-  
+
   Subscription({
     required this.url,
     this.name,
     this.lastUpdate,
     this.servers = const [],
   });
-  
+
   Map<String, dynamic> toJson() => {
-    'url': url,
-    'name': name,
-    'lastUpdate': lastUpdate?.toIso8601String(),
-    'servers': servers.map((s) => s.toJson()).toList(),
-  };
-  
+        'url': url,
+        'name': name,
+        'lastUpdate': lastUpdate?.toIso8601String(),
+        'servers': servers.map((s) => s.toJson()).toList(),
+      };
+
   factory Subscription.fromJson(Map<String, dynamic> json) => Subscription(
-    url: json['url'] as String,
-    name: json['name'] as String?,
-    lastUpdate: json['lastUpdate'] != null 
-        ? DateTime.parse(json['lastUpdate'] as String) 
-        : null,
-    servers: (json['servers'] as List?)
-        ?.map((s) => ServerConfig.fromJson(s as Map<String, dynamic>))
-        .toList() ?? [],
-  );
+        url: json['url'] as String,
+        name: json['name'] as String?,
+        lastUpdate: json['lastUpdate'] != null
+            ? DateTime.parse(json['lastUpdate'] as String)
+            : null,
+        servers: (json['servers'] as List?)
+                ?.map((s) => ServerConfig.fromJson(s as Map<String, dynamic>))
+                .toList() ??
+            [],
+      );
 }
 
 /// Server configuration model
@@ -45,7 +46,7 @@ class ServerConfig {
   final String address;
   final int port;
   int? latencyMs;
-  
+
   ServerConfig({
     required this.url,
     required this.remark,
@@ -54,25 +55,25 @@ class ServerConfig {
     required this.port,
     this.latencyMs,
   });
-  
+
   Map<String, dynamic> toJson() => {
-    'url': url,
-    'remark': remark,
-    'protocol': protocol,
-    'address': address,
-    'port': port,
-    'latencyMs': latencyMs,
-  };
-  
+        'url': url,
+        'remark': remark,
+        'protocol': protocol,
+        'address': address,
+        'port': port,
+        'latencyMs': latencyMs,
+      };
+
   factory ServerConfig.fromJson(Map<String, dynamic> json) => ServerConfig(
-    url: json['url'] as String,
-    remark: json['remark'] as String,
-    protocol: json['protocol'] as String,
-    address: json['address'] as String,
-    port: json['port'] as int,
-    latencyMs: json['latencyMs'] as int?,
-  );
-  
+        url: json['url'] as String,
+        remark: json['remark'] as String,
+        protocol: json['protocol'] as String,
+        address: json['address'] as String,
+        port: json['port'] as int,
+        latencyMs: json['latencyMs'] as int?,
+      );
+
   factory ServerConfig.fromV2RayURL(V2RayURL v2rayUrl) {
     final config = v2rayUrl.parse();
     return ServerConfig(
@@ -92,7 +93,7 @@ class PingResult {
   final int latencyInMs;
   final bool success;
   final String? error;
-  
+
   PingResult({
     required this.subscriptionIndex,
     required this.serverIndex,
@@ -105,13 +106,13 @@ class PingResult {
 /// Subscription manager
 class SubscriptionManager {
   final List<Subscription> _subscriptions = [];
-  final StreamController<PingResult> _pingResultController = 
+  final StreamController<PingResult> _pingResultController =
       StreamController<PingResult>.broadcast();
-  
+
   Stream<PingResult> get onPingResult => _pingResultController.stream;
-  
+
   List<Subscription> get subscriptions => List.unmodifiable(_subscriptions);
-  
+
   /// Add subscription
   void addSubscription({required String subscriptionURL, String? name}) {
     final subscription = Subscription(
@@ -120,63 +121,63 @@ class SubscriptionManager {
     );
     _subscriptions.add(subscription);
   }
-  
+
   /// Clear all subscriptions
   void clearSubscriptions() {
     _subscriptions.clear();
   }
-  
+
   /// Update subscription by downloading and parsing
   Future<bool> updateSubscription({required int subscriptionIndex}) async {
     if (subscriptionIndex < 0 || subscriptionIndex >= _subscriptions.length) {
       return false;
     }
-    
+
     final subscription = _subscriptions[subscriptionIndex];
-    
+
     try {
       final response = await http.get(Uri.parse(subscription.url));
-      
+
       if (response.statusCode != 200) {
         return false;
       }
-      
+
       // Decode base64 subscription content
       String content;
       try {
         content = utf8.decode(base64.decode(response.body));
       } catch (_) {
         content = response.body;
       }
-      
+
       // Parse servers from subscription
       final lines = content.split('\n');
       final servers = <ServerConfig>[];
-      
+
       for (final line in lines) {
         final trimmed = line.trim();
         if (trimmed.isEmpty) continue;
-        
+
         final v2rayUrl = parseV2RayURL(trimmed);
         if (v2rayUrl != null) {
           servers.add(ServerConfig.fromV2RayURL(v2rayUrl));
         }
       }
-      
+
       // Update subscription
       _subscriptions[subscriptionIndex] = Subscription(
         url: subscription.url,
         name: subscription.name,
         lastUpdate: DateTime.now(),
         servers: servers,
       );
-      
+
       return true;
     } catch (e) {
       return false;
     }
   }
-  
+
   /// Ping server
   Future<void> pingServer({
     required int subscriptionIndex,
@@ -193,7 +194,7 @@ class SubscriptionManager {
       ));
       return;
     }
-    
+
     final subscription = _subscriptions[subscriptionIndex];
     if (serverIndex < 0 || serverIndex >= subscription.servers.length) {
       _pingResultController.add(PingResult(
@@ -205,28 +206,28 @@ class SubscriptionManager {
       ));
       return;
     }
-    
+
     final server = subscription.servers[serverIndex];
-    
+
     try {
       final stopwatch = Stopwatch()..start();
-      
+
       // Simple TCP connection test
       // TODO: Implement proper proxy-through ping
       final socket = await Socket.connect(
         server.address,
         server.port,
         timeout: const Duration(seconds: 5),
       );
-      
+
       stopwatch.stop();
       final latency = stopwatch.elapsedMilliseconds;
-      
+
       await socket.close();
-      
+
       // Update server latency
       server.latencyMs = latency;
-      
+
       _pingResultController.add(PingResult(
         subscriptionIndex: subscriptionIndex,
         serverIndex: serverIndex,
@@ -243,7 +244,7 @@ class SubscriptionManager {
       ));
     }
   }
-  
+
   /// Get server configuration
   ServerConfig? getServer({
     required int subscriptionIndex,
@@ -252,18 +253,17 @@ class SubscriptionManager {
     if (subscriptionIndex < 0 || subscriptionIndex >= _subscriptions.length) {
       return null;
     }
-    
+
     final subscription = _subscriptions[subscriptionIndex];
     if (serverIndex < 0 || serverIndex >= subscription.servers.length) {
       return null;
     }
-    
+
     return subscription.servers[serverIndex];
   }
-  
+
   /// Dispose resources
   void dispose() {
     _pingResultController.close();
   }
 }
-