Add DB BahnCard extractor

This is useful for importing a digital representation from preliminary
PDFs or DB Navigator into Itinerary.

src/lib/scripts/deutschebahn.js

@@ -270,3 +270,16 @@ function parseCancellation(html) {
     res.reservationFor = 1;
     return res;
 }
+
+function parseBahncard(code, node) {
+    if (code.ticketLayout.type != "RCT2" || !code.ticketLayout.text(0, 12, 40, 1).match(/BAHNCARD/i)) {
+        return;
+    }
+
+    var bc = JsonLd.newObject("ProgramMembership");
+    bc.programName = code.ticketLayout.text(1, 12, 40, 1);
+    bc.membershipNumber = code.ticketLayout.text(14, 11, 16, 1);
+    bc.member = node.result[0].underName;
+    bc.token = node.result[0].reservedTicket.ticketToken;
+    return bc.programName != undefined ? bc : undefined;
+}

src/lib/scripts/deutschebahn.json

@@ -56,5 +56,18 @@
         "function": "parseCancellation",
         "mimeType": "text/html",
         "script": "deutschebahn.js"
+    },
+    {
+        "filter": [
+            {
+                "field": "carrierId",
+                "match": "80",
+                "mimeType": "internal/uic9183",
+                "scope": "Current"
+            }
+        ],
+        "function": "parseBahncard",
+        "mimeType": "internal/uic9183",
+        "script": "deutschebahn.js"
     }
 ]