antlr 3 ambiguity
- by tcris
Hello, I try to write some simple rules and I get this ambiguity
rule: field1 field2; //ambiguity between nsf1 and nsf2 even if I use lookahead k=4
field1: nsf1 | whatever1...;
field2: nsf2 | whatever2...;
nsf1: 'N' 'S' 'F' '1'; //meaning: no such field 1
nsf2: 'N' 'S' 'F' '2'; //meaning: no such field 2
I understand the ambiguity, but I don't understand why lookahead doesn't solve this.
I have a simple solution but I don't like it:
rule: (nsf1 (nsf2 | whatever2))
| (whatever1 (nsf2 | whatever2));
Does anybody have a more elegant solution?
Thanks a lot,
Chris
