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A code walker that parses a Common Lisp sexp into an AST, a tree of CLOS objects. This AST is a much more convenient representation to do various code analysis and transformations than sexps. Also features an unwalker that can turn the walked CLOS AST tree back into an sexp.
An obsolete one:
It was originally written by Marco Baringer in his Arnesi library. With his permission it was first factored out into a standalone cl-walker library and then renamed to hu.dwim.walker as part of a broad refactoring of all our (http://dwim.hu) libs.
Contains important contribution by several people, please consult the history of the source repository for the details.
It's in a very good shape, used in production code. It's not completely settled down though, still receives regular patches and extensions.
SBCLAllegroECLCCL
TODO