PEGC is a parser generator that takes as input a grammar in a format similar to
that of BNFC, except with support for asymmetric choice, the & combinator,
the ! combinator, and local failure via raise.
It outputs a C++ file that uses the PEGTL library to parse the language specified in the grammar you provided.
Contact me via my email, or by talking to me on FreeNode IRC
(my nick is taktoa, of course).