Existential Operator / Null Propagation Operator
brendan at mozilla.org
Wed Apr 8 01:24:31 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
We must avoid being too clever -- it complicates implementations and
inevitably incurs future-hostility to extensions we may want, if not
All of this suggests prefix ? is the better course. Anyone have
> On Mon, Apr 6, 2015 at 2:42 PM, Brendan Eich <brendan at mozilla.org
> <mailto: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.
> No, it looks like I didn't.
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