[antlr-interest] Lexer Predicates?

[Foust]

Hi,

 

Do lexer predicates work in v3?

 

I am used to yacc requesting tokens from the lexer as required. But ANTLR
seems to run the lexer in its entirety and gather *all* the tokens first.

 

So any predicates referencing states set in the Parser are effectively
ignored.

                                                                  

Is there any way around this?

 

(Does a particular option cause this? It is strange that this preprocessing
happens for *all* tokens, even those generated by antlr when it sees rules
with literals. Surely a literal in one rule won't become a keyword that
can't be used in any other context?)

 

Brent

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