[antlr-interest] rulecatch in lexer

["Paul Bouché (NSN)"]

Hi,

I would need a rulecatch statement support for lexers. I tried
@lexer::rulecatch {
    catch (RecoginitionException e) {
        System.out.println(huhu);
    }
}

but it didn't work... it was ignored.  I need this inorder to elegantly 
include a backward compatible adoption to our lexer. It supports only 
quoted strings, but now we need backward compatible behaviour. We need 
to also understand unquoted strings. This would not be a problem, but we 
have several tokens which are unquoted: identifiers, ipaddresses etc. Of 
course I could build a rather complex lexer rule, i.e. making sure 
anything else may not be matched, but the things I want.. Acutally I 
failed and at one time I got a "code too large" error, so I conclude 
upon lexical error and in the right context (via a gated syntactic 
predicate) I would try to match an unquoted string. Currently I can only 
do this by overrider nextToken() because in recover I cannot emit a 
token or rather after recovery the while loop in nextToken starts over 
overwriting the token. I would like to avoid overriding nextToken as 
much as possible, but I need to do it.

BR,
Paul

-- 
Paul Bouché
Voice: +49 30 590080-1284
 
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