[antlr-interest] ANTLR meta-syntax question

[Brian Smith]

I am new to ANTLR. I have found that it seems fairly straightforward to 
convert a BNF grammar to work with ANTLR. But, I am having trouble 
understanding why ANTLR insists on me using parentheses when they seem 
redundant to me. For example, I have a rule:

A    :    B+;

I expect to match one or more B's. But, ANTLR complains unless I rewrite 
the rule as:

A    :   (B)+;

To me, the parentheses are not necessary. Am I doing something wrong? Is 
there a particular reason that ANTLR requires the parentheses? I prefer 
to use parentheses only for grouping.

Thanks,
Brian



 

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