Essence 2.0 LR parser generator available

Essence is a generator for LR(k) and SLR(k) parsers in R5RS or R6RS Scheme.

The generated parsers perform error recovery, and are highly
efficient. Testing and debugging a parser does not require an
edit-generate-compile-test cycle. Rather, the parser generator results
from a general parser which takes the input grammar as a parameter; no
generation and recompilation is necessary to try out changes to a
grammar. The generated parsers result from the general parser by an
automatic program transformation called partial evaluation. This
guarantees consistency and ensures correctness. However, no specific
knowledge of partial evaluation is required to use Essence.

Running Essence requires Scheme 48.

Essence 2.0 is a significant improvement over previous releases.  In
particular, the grammar syntax has been revised.  The generated parsers
are re-entrant, and more compact.  Also, error handling and recovery has
been considerably improved. Applicability, scalability, and robustness
have been verified in an industrial compiler project.

Essence is available from:

http://www.informatik.uni-freiburg.de/proglang/software/essence/

Enjoy!

Mike Sperber
Peter Thiemann