[antlr-interest] Understanding lookahead

[Gavin Lambert]

At 12:16 18/06/2007, Terence Parr wrote:
 >On Jun 18, 2007, at 9:01 AM, Oliver Zeigermann wrote:
 >> which I was hoping would introduce backtracking which should
 >> have made your example work. Indeed, that option inserted some 

 >> code, but IMHO totally meaningless and without effect.
 >>
 >> Maybe this does not work for the lexer?
 >
 >I've never tried it in the lexer...I'd suggest avoiding it even 
if
 >it works. ;)

Lexer backtracking doesn't appear to work at the moment, but it is 
currently my #2 most wanted feature :)

(I also think that the lexer should backtrack by default even 
without any options and without having to make the parser 
backtrack too.  The behaviour of the lexer just makes more sense 
to me that way.  But I've said that before.)