[antlr-interest] Q: How do I left-factor this?

[Gavin Lambert]

At 00:01 14/11/2007, Austin Hastings wrote:
 >fragment MultiLineComment : '/*' .* '*/';
 >fragment SingleLineComment : '//' ~('\r' | '\n')* '\r'? '\n';
 >fragment NestedCodeBlock
 >    : '{'
 >        (options {greedy=false;}
 >        : MultiLineComment
 >        | NestedCodeBlock
 >        | SingleLineComment
 >        | QUOTED_LITERAL
 >        | .
 >        )*
 >      '}'
 >    ;
 >
 >The problem is that ANTLR complains about non-LL(*) left 
recursion
 >in alternatives 1,2 and 5, and suggests left factoring the 
things.
 >I have found that adding option k=2 will make the problem
 >(apparently) go away.

The only thing I can see in there that looks particularly dodgy is 
the final "." alt.  Try changing it to "~('{' | '}')" and see if 
that improves anything.