derp2 is as an alternate implementation of the derp parsing tool used in my
compilers class.
derp2 compiles complex regular operations, reductions and special compound forms
in context-free grammars down to the simplified Backus-Naur Form suitable for use
in parsing tools like Racket's parser-tools/yacc or parser-tools/cfg-parser.
The pattern forms available in the tool are documented in a blog post on desugaring regular operations in context-free grammars.
To build and install as a racket collection, run raco pkg install.
(require derp2)
(derp2-parser
...)
Use derp2-parser like cfg-parser, but place derp-style rules in the (grammar) section.