INCLUDE statements not parsed about fortran-src

[dorchard]

I propose, for the moment, that we create a 'permissive mode' F77 parser (using CPP is probably easiest) which adds a production for INCLUDE to the grammar. Then we can generate two parsers:
Fortran77 and Fortran77Permissive (the later of which we can use with some of our corpus, which is F77 but has includes).

[madgen]

That already exists it it called Fortran77Extended. There is no way of selectively adding rules to one but not the other though. So for INCLUDE it will just be an overgenerating parser.

Keep in mind F90 already supports INCLUDE.

[dorchard]

I suggested using CPP so that we can selectively add rules to one but not the other.

[madgen]

Ohhhh, I see. That's a good idea but it requires some thinking because every divergent production needed to be generated twice and all productions that have divergent productions on RHS also need to be generated with two names, etc. Do you mind leaving this open until Monday and we can discuss in the meeting and I can start implementing right away?

[dorchard]

Sure. That'd be great. I don't follow what you are saying about generating twice / two names though. I was thinking that for INCLUDE we could get away with having an additional case for NONEXECUTABLE_STATEMENT that is wrapped in an #ifdef block. We can then generate two .y files (with some #ifdef on the module/parser names).