Search code examples
parsinghaskellfortrangrammarhappy

Generate Fortran 77 parser from a yacc grammar using Happy (Haskell)

I have stumbled upon the following F77 yacc grammar: http://yaxx.cvs.sourceforge.net/viewvc/yaxx/yaxx/fortran/fortran.y?revision=1.3&view=markup.

How can I make a Fortran 77 parser out of this file using Happy?

Why is there some C?/C++? code in that .y file?

UPDATE: Thank you for your replies!

I've been playing with two fresh approaches for a while now:

  1. extracting and modifiying the parser from the source code package bundled with a paper titled Parametric Fortran,
  2. writing a grammar from scratch with the help of BNFC.

I've got both to parse simple code excerpts already. I'll keep people in the know should something usable come into existence within this century ^__^" hehe.

P/S: Want to see whether I could gather enough momentum on my own to initiate a project for an automatic differentiation engine to replace a binary-only one we depend on for the time being. For entertainment at the initial stages: I'm watching Love Shuffle! It's a very enjoyable J-Drama! Highly recommendable ...

Solution

  • Use BNFC and write your own grammar from scratch! BNFC works wonders and you could do your parsing exactly as you desire.