[antlr-interest] exception thrown in syntatic predicate can't be caught!

[martinkbraid]

Because I need to be able to handle garbage characters passed to my 
parser/lexer, I'm doing my own error processing in a top level rule 
by catching ANTLRExceptions. 

By chance, during syntactic predicate processing, the lexer 
encounters a garbage character and throws a TokenStreamException. But 
because inputState.guessing > 0 (because it was in a syntactic 
predicate), my exception handler does NOT get control and the 
exception passes out of the parser. What do I do? It would be 
impossible to avoid syntatic predicates?

Thanks, Martin Braid


 

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