Improve syntax check on timetable files

Author: Roeterdink

Source/Orts.Simulation/Simulation/Timetables/ProcessTimetable.cs

@@ -257,6 +257,10 @@ public List<TTTrain> ProcessTimetable(string[] arguments, CancellationToken canc
                 {
                     Trace.TraceInformation("Player trains " + reqPlayerTrain.Name + " defined without engine, engine assumed to be attached later");
                 }
+                else if (reqPlayerTrain.FormedOf >= 0)
+                {
+                    Trace.TraceInformation("Player trains " + reqPlayerTrain.Name + " defined without engine, train is assumed to be formed out of other train");
+                }
                 else
                 {
                     throw new InvalidDataException("Can't find player locomotive in " + reqPlayerTrain.Name);

Source/Orts.Simulation/Simulation/Timetables/TTTrain.cs

@@ -7874,17 +7874,36 @@ public void ProcessTimetableStopCommands(TTTrainCommands thisCommand, int subrou
                     break;
 
                 case "callon":
-                    if (thisStationStop != null) thisStationStop.CallOnAllowed = true;
+                    if (thisStationStop == null)
+                    {
+                        Trace.TraceInformation("Cannot set CALLON without station stop time : train " + Name + " ( " + Number + " )");
+                    }
+                    else
+                    {
+                        thisStationStop.CallOnAllowed = true;
+                    }
                     break;
 
                 case "hold":
-                    if (thisStationStop != null)
+                    if (thisStationStop == null)
+                    {
+                        Trace.TraceInformation("Cannot set HOLD without station stop time : train " + Name + " ( " + Number + " )");
+                    }
+                    else
+                    {
                         thisStationStop.HoldSignal = thisStationStop.ExitSignal >= 0; // set holdstate only if exit signal is defined
+                    }
                     break;
 
                 case "nohold":
-                    if (thisStationStop != null)
+                    if (thisStationStop == null)
+                    {
+                        Trace.TraceInformation("Cannot set NOHOLD without station stop time : train " + Name + " ( " + Number + " )");
+                    }
+                    else
+                    {
                         thisStationStop.HoldSignal = false;
+                    }
                     break;
 
                 case "forcehold":
@@ -7968,15 +7987,36 @@ public void ProcessTimetableStopCommands(TTTrainCommands thisCommand, int subrou
                     break;
 
                 case "nowaitsignal":
-                    thisStationStop.NoWaitSignal = true;
+                    if (thisStationStop == null)
+                    {
+                        Trace.TraceInformation("Cannot set NOWAITSIGNAL without station stop time : train " + Name + " ( " + Number + " )");
+                    }
+                    else
+                    {
+                        thisStationStop.NoWaitSignal = true;
+                    }
                     break;
 
                 case "waitsignal":
-                    thisStationStop.NoWaitSignal = false;
+                    if (thisStationStop == null)
+                    {
+                        Trace.TraceInformation("Cannot set WAITSIGNAL without station stop time : train " + Name + " ( " + Number + " )");
+                    }
+                    else
+                    {
+                        thisStationStop.NoWaitSignal = false;
+                    }
                     break;
 
                 case "noclaim":
-                    thisStationStop.NoClaimAllowed = true;
+                    if (thisStationStop == null)
+                    {
+                        Trace.TraceInformation("Cannot set NOCLAIM without station stop time : train " + Name + " ( " + Number + " )");
+                    }
+                    else
+                    {
+                        thisStationStop.NoClaimAllowed = true;
+                    }
                     break;
 
                 // no action for terminal (processed in create station stop)