New Ping, use servers to ping

lib/data/model/server/ping_result.dart

@@ -0,0 +1,79 @@
+final parseFailed = Exception('Parse failed');
+final seqReg = RegExp(r'icmp_seq=(.+) ttl=(.+) time=(.+) ms');
+final packetReg =
+    RegExp(r'(.+) packets transmitted, (.+) received, (.+)% packet loss');
+final timeReg = RegExp(r'min/avg/max/mdev = (.+)/(.+)/(.+)/(.+) ms');
+final ipReg = RegExp(r' \((\S+)\) ');
+
+class PingResult {
+  String serverName;
+  String? ip;
+  List<PingSeqResult>? results;
+  PingStatistics? statistic;
+
+  PingResult.parse(this.serverName, String raw) {
+    final lines = raw.split('\n');
+    lines.removeWhere((element) => element.isEmpty);
+    final statisticIndex =
+        lines.indexWhere((element) => element.startsWith('---'));
+    if (statisticIndex == -1) {
+      throw parseFailed;
+    }
+    final statisticRaw = lines.sublist(statisticIndex + 1);
+    statistic = PingStatistics.parse(statisticRaw);
+    results = lines
+        .sublist(1, statisticIndex)
+        .map((e) => PingSeqResult.parse(e))
+        .toList();
+    ip = ipReg.firstMatch(lines[0])?.group(1);
+  }
+}
+
+class PingSeqResult {
+  int? seq;
+  int? ttl;
+  double? time;
+
+  PingSeqResult.parse(String raw) {
+    final seqMatched = seqReg.firstMatch(raw);
+    if (seqMatched == null) {
+      throw parseFailed;
+    }
+    seq = int.tryParse(seqMatched.group(1)!);
+    ttl = int.tryParse(seqMatched.group(2)!);
+    time = double.tryParse(seqMatched.group(3)!);
+  }
+
+  @override
+  String toString() {
+    return 'seq: $seq, ttl: $ttl, time: $time';
+  }
+}
+
+class PingStatistics {
+  int? total;
+  int? received;
+  double? loss;
+  double? min;
+  double? max;
+  double? avg;
+  double? stddev;
+
+  PingStatistics.parse(List<String> lines) {
+    if (lines.isEmpty || lines.length != 2) {
+      return;
+    }
+    final packetMatched = packetReg.firstMatch(lines[0]);
+    final timeMatched = timeReg.firstMatch(lines[1]);
+    if (packetMatched == null || timeMatched == null) {
+      return;
+    }
+    total = int.tryParse(packetMatched.group(1)!);
+    received = int.tryParse(packetMatched.group(2)!);
+    loss = double.tryParse(packetMatched.group(3)!);
+    min = double.tryParse(timeMatched.group(1)!);
+    avg = double.tryParse(timeMatched.group(2)!);
+    max = double.tryParse(timeMatched.group(3)!);
+    stddev = double.tryParse(timeMatched.group(4)!);
+  }
+}