[antlr-interest] C TARGET: Strange No Viable Exception

register register72 at gmail.com
Mon Mar 26 11:10:27 PDT 2012

I have just discovered another detail that could be useful to troubleshoot
the issue:

when I create the lexer stream directly from an input file using
"antlr3FileStreamNew" I get no error at all;
when I use antlr3StringStreamNew to create the stream from a string in
memory I get the No viable exception.


On Mon, Mar 26, 2012 at 7:28 PM, register <register72 at gmail.com> wrote:

> Hi all,
> I have an antlr generated C  lexer that keeps on throwing several  "No
> Viable Exceptions" just at the end of the file. I have developed the
> grammar in AntlrWorks and the Java Lexer doesn't have any trouble at all.
> The  ANTLR3_EXCEPTION struct passed to the "
> displayRecognitionError" method does not carry any useful information:
> - expecting, token and expectingSet are all null
> - there is a mysmatch between the type and name field: type is 3
> "org.antlr.runtime.RecognitionException".
> However it seems that the grammar is always able to complete a successful
> parse of the files. I have made several attempts with various input and the
> results I get are always correct. Still this "No Viable Exceptions" is
> pretty annoying.
> How could I debug this issue?
> Regards,
> Luca

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