A compiler front-end generator.

Latest on Hackage:2.8.1

This package is not currently in any snapshots. If you're interested in using it, we recommend adding it to Stackage Nightly. Doing so will make builds more reliable, and allow to host generated Haddocks.

GPL-2 licensed

The BNF Converter is a compiler construction tool generating a compiler front-end from a Labelled BNF grammar. It was originally written to generate Haskell, but starting from Version 2.0, it can also be used for generating Java, C++, and C.

Given a Labelled BNF grammar the tool produces: an abstract syntax as a HaskellC++C module or Java directory, a case skeleton for the abstract syntax in the same language, an Alex, JLex, or Flex lexer generator file, a Happy, CUP, or Bison parser generator file, a pretty-printer as a HaskellJavaC++/C module, a Latex file containing a readable specification of the language.


2.8 Grégoire Détrez <> May 2015
* Builds with ghc 7.10.1
* Add support for JFlex (java)
* Add an option to generate files in an other directory
* Add an experimental option that turns the AST into a parametrized
functor (in Haskell only)
* New pygment backend to generate syntax highlighters
* Bug fixes

2.7.1 Grégoire Détrez <> October 2014
* Generated haskell code is now warning free
* Removed unused terminal in happy
* Correctly escape backslashes in symbols
* Fix problem that was preventing custom tokens to work in OCaml if
they conflict with the build-in Ident
* BNFC build is also warning free (ghc 7.4.2)
* Test programs return non-zerro exit code on parse error Grégoire Détrez <> September 2014
* Add token support for Ocaml
* New option parser
* Adds an optional argument to change Makefile name
* Add a --ghc option to derive Data, Typeable, Generic in Haskell
* New online documentation (
* Derive ``Read`` for newtype decls in Haskell
* New option to get the version number --version
* Remove the F# backend
* Remove the Java4 backend
* New Applicative and Alternative instances to ``Err``
* Remove the coupling between building the parser and the pdf from
* Improvement to the CNF Backend
* Bug fixes #92, #21, #34, #33, #90, #30, #60
Used by 2 packages:
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