Grammar for ISO-EBNF with python target

[Paul]

Is there an ISO-EBNF grammar for ANTLR? I want to create a metagrammar so that my python program can parse EBNF grammars and act on them. Would it be hard to write such a grammar from scratch? I tried to use [1] to write a BNF grammar for PLY, but the description of EBNF in EBNF is confusing. For example, why are there two definitions of "syntax" on page 9?

1. https://www.cl.cam.ac.uk/~mgk25/iso-14977.pdf

[Venkatram Akkineni]

Apparantly it is not possible to create a Context-Free grammar for ISO EBNF. In case you haven't already found the SO link listed below.

http://stackoverflow.com/a/20179940/1056010

[Eric Vergnaud]

Hi,

you might be right, but ANTLR4 supports left recursion and implicit precedence (through rule order),

so the EBNF fragment in the SO example below could be implemented using ANTLR.

Eric