Hacking DMD to Query Context Information at Source File Offset

["Nordlöw"]

Where should I put logic-and-printfs in DMD to show lexical, 
syntactic and semantic information about a symbol and/or 
expression at given position in the source file being parsed.

I'm guessing for some iteration in the lexical, syntactic and 
semantic passes respectively where I need to check whether my 
query offset lies inside inside some  context window currently 
being analyzed by DMD.