I hoping someone could give me some pointers on adding a warning message to the Daffodil io code. I'm looking at Daffodil-412 and want to generate a warning message when the REGex search gets expanded and another if it exceeds the tunable for maximum length.
I've located the code that does these expansions in io/InputSourceDaraInputStream.scala, but I'm unsure how to generate the warning messages. I don't see any other warning messages being generated in the io code. I've seen several instances in core that just use SDW(...) and others in DSOM that use context.SDW(...), but I'm confused about this - I'm afraid that this method buffers warnings and throws them away in the case of backtracking. Since the REGex search may be the cause of backtracking, I think these warnings need to be presented always. I'm just not sure of the proper way to access SDW in this situation and need to make sure that the messages will not be discarded.
