public bool TryGetValidValue(TexlNode argNode, TexlBinding binding, out IExternalDataSource dsInfo)
{
Contracts.AssertValue(argNode);
Contracts.AssertValue(binding);
dsInfo = null;
switch (argNode.Kind)
{
case NodeKind.FirstName:
return(TryGetDsInfo(argNode.AsFirstName(), binding, out dsInfo));
case NodeKind.Call:
return(TryGetDsInfo(argNode.AsCall(), binding, out dsInfo));
case NodeKind.DottedName:
return(TryGetDsInfo(argNode.AsDottedName(), binding, out dsInfo));
case NodeKind.As:
return(TryGetValidValue(argNode.AsAsNode().Left, binding, out dsInfo));
}
return(false);
}