POSIX sh EBNF grammar

Question

Is there an existing POSIX sh grammar available or do I have to figure it out from the specification directly?

Note I\'m not so much interested in a pure sh

Answer 1

I have done some more digging and found these resources:

1. An sh tutorial located here

2. A Bash book containing Bash 2.0's BNF grammar (gone from here) with the relevant appendix still here

I have looked through the sources of bash, pdksh, and posh but haven't found anything remotely at the level of abstraction I need.