[antlr-interest] ANTLR grammar extension

[Rob Leek, van der]

Hi,

I want to extend the grammar of ANTLR, what would be
the best way to do this? 

For example, I want to define a new EBNF-like operator
'@' (that can be used like the '?', '+' and '*'
operators). 
My initial idea was to create a parser based on the
ANTLR grammar and extend it with the '@' operator.
This parser would insert some semantic actions on
places where the '@' occurs in the grammar and outputs
a general ANTLR grammar which conforms to the standard
ANTLR grammar. My program would simply work like a
preprocessor then.

So basicly I'm looking for a clean ANTLR grammar which
I can extend with an '@' operator and where I can
define the other rules as: output unmodified.

A problem with that is that I can't find a 'clean'
ANTLR grammar, only the one shipped with ANTLR but
that one contains a lot of semantic actions.

I don't think grammar inheritance is an option here,
since I don't need all the parser creation
functionalities from the original grammar.

Regards,
Rob van der Leek

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