Hi Indhu,
I get "Mismatched token exception". If remove the ESC_SEQ tokens/rules and
make it look as below, it works okay. If I add the ESC_SEQ (see below)
stuff back in, it will work IF I place an escape sequence as the first
character. Seems to work okay in the debugger (I'm very new to ANTLR),
though. I don't see why this wouldn't work in the interpreter, but then
again I don't know much yet. I have no predicates or anything, just
experimenting with ANTLRWorks wizard generated parser...
Thanks!
STRING
: '"' ( ESC_SEQ | ~('\\'|'"') )* '"';
fragment
ESC_SEQ
:'\\' ('b'|'t'|'n'|'f'|'r'|'\"'|'\''|'\\')
| OCTAL_ESC
| UNICODE_ESC
fragment
OCTAL_ESC
: '\\' ('0'..'3') ('0'..'7') ('0'..'7')
| '\\' ('0'..'7') ('0'..'7')
| '\\' ('0'..'7')
;
fragment
UNICODE_ESC
: '\\' 'u' HEX_DIGIT HEX_DIGIT HEX_DIGIT HEX_DIGIT
;
On Tue, Oct 13, 2009 at 2:10 PM, Indhu Bharathi <[email protected]>wrote:
> Prefer using debugger instead of interpreter. Interpreter doesn’t work as
> expected sometimes (when you are using semantic predicates).
>
>
>
> That said, for this particular case it seems to works fine.
>
>
>
> r : STRING
>
> ;
>
>
>
> STRING
>
> : '"' ( ~('\\'|'"') )* '"'
>
> ;
>
>
>
> Are you using semantic predicates somewhere else that causes the
> interpreter to fail?
>
>
>
> BTW, what is the error message you get?
>
>
>
> Cheers, Indhu
>
>
>
>
>
> *From:* [email protected] [mailto:
> [email protected]] *On Behalf Of *Mark Wilson
> *Sent:* Tuesday, October 13, 2009 11:34 PM
> *To:* [email protected]
> *Subject:* [antlr-interest] ANTLRWorks question
>
>
>
> I used the ANTLRWorks wizard to start my grammar. There appears to be
> something wrong with the STRING token, basically something like "Joe" does
> not parse correctly in the interpreter. This is what the rule looks like:
>
> STRING
> : '"' ( ESC_SEQ | ~('\\'|'"') )* '"'
> ;
>
> What is this supposed to do?
>
> Thanks,
> Mark Wilson
>
> --
> Mark Wilson
>
--
Mark Wilson
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