[antlr-interest] A look-ahead/rewind problem

[Andreas Meyer]

Lukasz Guminski schrieb:
>
>
>
>     I would suggest you try without the syntactic predicate, turn your
>     semantic predicate into a gated semantic predicate {...}? => such that
>     it is forced to be evaluated:
>
>     block_open: {is_block_open()}?=> BLOCK_BOUNDARY
>
>
> I cannot use a function without a parameter, because the decision 
> bases on the name of a block. So the function needs to be of a form: 
> /is_block_open(String blockName)/ function, and retrieving the 
> parameter requires the parser to make a look-ahead. That's what I need 
> the syntactic predicate for.
Yes, that was meant as an example. If you need lookahead, you may also 
consider using something like 
input.LT(2).getText().equals(mystackofnames.top()).  Anyway, have you 
tried turning the sem. predicate into a gated sem. predicate (just add a 
=> after the ?)

Andreas