The Amsterdam Toolkit for Language Archaeology

As of today, GRK is particularly fit for Cobol archaeology, more specifically for IBM's VS Cobol II. That is, GRK offers a fully mechanised process, where IBM's reference is used as an input, and the output is a transformed language reference whose grammar portions are correct and complete. (The recovery required several hundreds of simple transformation steps in order to deliver a grammar that is fit for parser derivation.) As a byproduct, GRK also generates a slow, Prolog-based parser. Via export to GRK's sibling, GDK (the Grammar Deployment Kit), a reasonably fast, btyacc-based parser can be generated as well. Both parsers accept all of the VS Cobol II code that is at our avail (several millions of lines of code).