Fix UUID parsing on Web

lib/src/models/ble_uuid.dart

@@ -1,31 +1,54 @@
-import 'package:bluez/bluez.dart';
-
 class BleUuid {
   /// Parse a String to valid UUID and convert a 16 bit UUID to 128 bit UUID
   /// Throws `FormatException` if the UUID is invalid
   static String parse(String uuid) {
-    if (uuid.length < 4) throw const FormatException("Invalid UUID");
+    if (uuid.length < 4) {
+      throw const FormatException('Invalid UUID');
+    }
+
     if (uuid.length <= 8) {
       uuid = "${uuid.padLeft(8, '0')}-0000-1000-8000-00805f9b34fb";
-    } else if (!uuid.contains("-")) {
+    }
+
+    if (!uuid.contains("-")) {
       if (uuid.length != 32) throw const FormatException("Invalid UUID");
+
       uuid = "${uuid.substring(0, 8)}-${uuid.substring(8, 12)}"
           "-${uuid.substring(12, 16)}-${uuid.substring(16, 20)}-${uuid.substring(20, 32)}";
     }
-    return BlueZUUID.fromString(uuid).toString();
+
+    var groups = uuid.split('-');
+
+    if (groups.length != 5 ||
+        groups[0].length != 8 ||
+        groups[1].length != 4 ||
+        groups[2].length != 4 ||
+        groups[3].length != 4 ||
+        groups[4].length != 12) {
+      throw const FormatException('Invalid UUID');
+    }
+
+    try {
+      int.parse(groups[0], radix: 16);
+      int.parse(groups[1], radix: 16);
+      int.parse(groups[2], radix: 16);
+      int.parse(groups[3], radix: 16);
+      int.parse(groups[4], radix: 16);
+    } catch (e) {
+      throw const FormatException('Invalid UUID');
+    }
+
+    return uuid.toLowerCase();
   }
 
   /// Parse 16/32 bit uuid like `0x1800` to 128 bit uuid like `00001800-0000-1000-8000-00805f9b34fb`
-  static String extend(int short) {
-    BlueZUUID blueZUUID = BlueZUUID.short(short);
-    return blueZUUID.toString();
-  }
+  static String extend(int short) =>
+      parse(short.toRadixString(16).padLeft(4, '0'));
 
   /// Compare two UUIDs to automatically convert both to 128 bit UUIDs
   /// Throws `FormatException` if the UUID is invalid
-  static bool equals(String uuid1, String uuid2) {
-    return parse(uuid1) == parse(uuid2);
-  }
+  static bool equals(String uuid1, String uuid2) =>
+      parse(uuid1) == parse(uuid2);
 }
 
 /// Parse a list of strings to a list of UUIDs

test/universal_ble_test.dart

@@ -20,6 +20,10 @@ void main() {
         BleUuid.parse('0000180a-0000-1000-8000-00805f9b34fb'),
         equals("0000180a-0000-1000-8000-00805f9b34fb"),
       );
+      expect(
+        BleUuid.parse('8000dd00-dd00-ffff-ffff-ffffffffffff'),
+        equals("8000dd00-dd00-ffff-ffff-ffffffffffff"),
+      );
       // Parse 128-bit uppercase uuid
       expect(
         BleUuid.parse('0000180A-0000-1000-8000-00805F9B34FB'),