Existential Operator / Null Propagation Operator

joe joeedh at gmail.com
Wed Apr 8 00:42:53 UTC 2015

That's a good point.  Are lexical non-DFA grammars allowed?  It would be
trivial to solve that with a regular expression lookahead.  Although I
suppose at that point you might as well call it a cover grammar.


On Mon, Apr 6, 2015 at 2:42 PM, Brendan Eich <brendan at mozilla.org> wrote:

> joe wrote:
>> By the way, I don't remember having grammar issues (I use a LALR
>> compiler-compiler).  Looking at my code, it looked like I handled it in the
>> tokenizer stage; I added a COND_DOT token:
>> COND_DOT : \?\.
> Did you keep backward compatibility? `x?.1:y` must continue to work.
> /be

No, it looks like I didn't.
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