[antlr-interest] Recursive Grammar

[Terence Parr]

On Thursday, June 6, 2002, at 03:09  PM, johnclarke72 wrote:

> If I have a situation when an item specified in a grammar can be
> repeated within itself how can I describe that using Antlr ?  eg A
> HTML Comment within a comment eg
>
> <!-- <!-- A HTML Comment --> -->
>
> I would be grateful for all advice offered.

Comment is a hard one due to the terminating condition needing 3 symbols 
of lookahead, but normally you would just do this:

rule : STUFF rule END_STUFF
        | OTHER_STUFF
        ;

recursion ain't no trouble...though in this case you might have trouble 
with the "rule" terminating condition.

Ter
--
Co-founder, http://www.jguru.com
Creator, ANTLR Parser Generator: http://www.antlr.org


 

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