Add Label 5U Weather Information Request decoder plugin

lib/MessageDecoder.ts

@@ -78,6 +78,7 @@ const pluginClasses = [
   Plugins.Label_QQ,
   Plugins.Label_QR,
   Plugins.Label_QS,
+  Plugins.Label_5U_WXR,
 ];
 
 export class MessageDecoder {

lib/plugins/Label_5U_WXR.ts

@@ -0,0 +1,134 @@
+import { DecoderPlugin } from '../DecoderPlugin';
+import { DecodeResult, Message, Options } from '../DecoderPluginInterface';
+import { ResultFormatter } from '../utils/result_formatter';
+
+/**
+ * Label 5U — Autonomous Weather Information Request (WXRQ)
+ *
+ * Downlink sent by the aircraft (typically shortly after takeoff or prior
+ * to arrival) requesting weather data (e.g. METAR) for a destination or
+ * alternate airport.
+ *
+ * Wire format (only the first three documented fields are decoded here):
+ *
+ *   OS KHRL /WXRKHRL ,
+ *   |  |    |        |
+ *   |  |    |        └── Trailing list delimiter (ignored — may precede
+ *   |  |    |            additional comma-separated entries, e.g. alternates)
+ *   |  |    └─────────── Weather request: `/WXR` + target ICAO (e.g. /WXRKHRL)
+ *   |  └──────────────── Destination airport ICAO (4 chars)
+ *   └─────────────────── Message subtype / system identifier
+ *                        (undocumented — exposed raw, per analyst guidance)
+ *
+ * Observed example:  `OS KHRL/WXRKHRL,`
+ */
+export class Label_5U_WXR extends DecoderPlugin {
+  name = 'label-5u-wxr';
+
+  qualifiers() {
+    return {
+      labels: ['5U'],
+    };
+  }
+
+  decode(message: Message, options: Options = {}): DecodeResult {
+    const decodeResult = this.initResult(
+      message,
+      'Autonomous Weather Information Request (WXRQ)',
+    );
+
+    const text = (message.text || '').trim();
+    if (!text) {
+      this.setDecodeLevel(decodeResult, false);
+      return decodeResult;
+    }
+
+    // ── Form B: Air France / Airbus-style slash-delimited ICAO list ──
+    //   <count-or-seq><ICAO1>/<ICAO2>/<ICAO3>[/<ICAO4>…]
+    //   Example:  `3LFRB/EINN/BIKF`
+    const formB = text.match(
+      /^(?<count>\d+)(?<icaos>[A-Z]{4}(?:\/[A-Z]{4})+)\s*$/,
+    );
+    if (formB?.groups) {
+      const count = formB.groups.count;
+      const icaos = formB.groups.icaos.split('/');
+      const [dep, dest, ...alternates] = icaos;
+
+      decodeResult.raw.count = count;
+      decodeResult.raw.icaos = icaos;
+      ResultFormatter.departureAirport(decodeResult, dep);
+      if (dest) ResultFormatter.arrivalAirport(decodeResult, dest);
+
+      decodeResult.formatted.items.unshift(
+        {
+          type: 'message_type',
+          code: 'MSGTYP',
+          label: 'Message Type',
+          value: 'Weather Information Request (WXRQ)',
+        },
+        {
+          type: 'count',
+          code: 'COUNT',
+          label: 'Sequence / Count',
+          value: count,
+        },
+      );
+      alternates.forEach((alt, i) => {
+        decodeResult.formatted.items.push({
+          type: 'alternate',
+          code: `ALT${i + 1}`,
+          label: i === 0 ? 'Alternate' : `Alternate ${i + 1}`,
+          value: alt,
+        });
+      });
+      decodeResult.formatted.items.push({
+        type: 'wxr_request',
+        code: 'WXRREQ',
+        label: 'Weather Requested For',
+        value: icaos.join(', '),
+      });
+
+      this.setDecodeLevel(decodeResult, true, 'full');
+      return decodeResult;
+    }
+
+    // ── Form A: `<subtype> <ICAO>/WXR<ICAO>` (e.g. `OS KHRL/WXRKHRL,`) ──
+    const regex =
+      /^(?<subtype>[A-Z]{1,4})\s+(?<dest>[A-Z]{3,4})\/WXR(?<wxrIcao>[A-Z]{3,4})/;
+    const m = text.match(regex);
+    if (!m?.groups) {
+      this.setDecodeLevel(decodeResult, false);
+      return decodeResult;
+    }
+
+    const { subtype, dest, wxrIcao } = m.groups;
+
+    decodeResult.raw.subtype = subtype;
+    ResultFormatter.arrivalAirport(decodeResult, dest);
+    decodeResult.raw.wxr_request_icao = wxrIcao;
+
+    decodeResult.formatted.items.unshift(
+      {
+        type: 'message_type',
+        code: 'MSGTYP',
+        label: 'Message Type',
+        value: 'Weather Information Request (WXRQ)',
+      },
+      {
+        type: 'subtype',
+        code: 'SUBTYPE',
+        label: 'Subtype',
+        value: subtype,
+      },
+    );
+    decodeResult.formatted.items.push({
+      type: 'wxr_request',
+      code: 'WXRREQ',
+      label: 'Weather Request',
+      value: `WXR for ${wxrIcao}`,
+    });
+
+    this.setDecodeLevel(decodeResult, true, 'full');
+    return decodeResult;
+  }
+}

lib/plugins/official.ts

@@ -64,3 +64,4 @@ export * from './Label_QR';
 export * from './Label_QP';
 export * from './Label_QS';
 export * from './Label_QQ';
+export * from './Label_5U_WXR';