Cleaned up the frame.ts by splitting payload parsing to subpackages

test/payload.capabilities.test.ts

@@ -0,0 +1,35 @@
+import { Dissected } from "@hamradio/packet";
+import { describe, expect, it } from "vitest";
+
+import { Frame } from "../src/frame";
+import { DataType, type Payload, type StationCapabilitiesPayload } from "../src/frame.types";
+
+describe("Frame.decodeCapabilities", () => {
+  it("parses comma separated capabilities", () => {
+    const data = "CALL>APRS:<IGATE,MSG_CNT";
+    const frame = Frame.fromString(data);
+    const decoded = frame.decode() as StationCapabilitiesPayload;
+    expect(decoded).not.toBeNull();
+    expect(decoded.type).toBe(DataType.StationCapabilities);
+    expect(Array.isArray(decoded.capabilities)).toBeTruthy();
+    expect(decoded.capabilities).toContain("IGATE");
+    expect(decoded.capabilities).toContain("MSG_CNT");
+  });
+
+  it("emits structure sections when requested", () => {
+    const data = "CALL>APRS:<IGATE MSG_CNT>";
+    const frame = Frame.fromString(data);
+    const res = frame.decode(true) as {
+      payload: Payload | null;
+      structure: Dissected;
+    };
+    expect(res.payload).not.toBeNull();
+    if (res.payload && res.payload.type !== DataType.StationCapabilities)
+      throw new Error("expected capabilities payload");
+    expect(res.structure).toBeDefined();
+    const caps = res.structure.find((s) => s.name === "capabilities");
+    expect(caps).toBeDefined();
+    const capEntry = res.structure.find((s) => s.name === "capability");
+    expect(capEntry).toBeDefined();
+  });
+});