private async Task <Message> RunLoop(CancellationToken ct, bool allowEval)
{
TaskUtilities.AssertIsOnBackgroundThread();
try {
_log.EnterRLoop(_rLoopDepth++);
while (!ct.IsCancellationRequested)
{
var message = await ReceiveMessageAsync(ct);
if (message == null)
{
return(null);
}
else if (message.RequestId != null)
{
return(message);
}
try {
switch (message.Name)
{
case "\\":
CancelAll();
break;
case "?":
await ShowDialog(message, allowEval, MessageButtons.YesNoCancel, CancellationTokenSource.CreateLinkedTokenSource(ct, _cancelAllCts.Token).Token);
break;
case "??":
await ShowDialog(message, allowEval, MessageButtons.YesNo, CancellationTokenSource.CreateLinkedTokenSource(ct, _cancelAllCts.Token).Token);
break;
case "???":
await ShowDialog(message, allowEval, MessageButtons.OKCancel, CancellationTokenSource.CreateLinkedTokenSource(ct, _cancelAllCts.Token).Token);
break;
case ">":
await ReadConsole(message, allowEval, CancellationTokenSource.CreateLinkedTokenSource(ct, _cancelAllCts.Token).Token);
break;
case "!":
case "!!":
message.ExpectArguments(1);
await _callbacks.WriteConsoleEx(
message.GetString(0, "buf", allowNull: true),
message.Name.Length == 1?OutputType.Output : OutputType.Error,
ct);
break;
case "![]":
message.ExpectArguments(1);
await _callbacks.ShowMessage(message.GetString(0, "s", allowNull: true), ct);
break;
case "~+":
await _callbacks.Busy(true, ct);
break;
case "~-":
await _callbacks.Busy(false, ct);
break;
case "~/":
_callbacks.DirectoryChanged();
break;
case "Plot":
await _callbacks.Plot(message.GetString(0, "xaml_file_path"), ct);
break;
case "Browser":
await _callbacks.Browser(message.GetString(0, "help_url"));
break;
default:
throw ProtocolError($"Unrecognized host message name:", message);
}
} catch (OperationCanceledException) when(!ct.IsCancellationRequested)
{
// Cancelled via _cancelAllCts - just move onto the next message.
}
}
} finally {
_log.ExitRLoop(--_rLoopDepth);
}
return(null);
}