[antlr-interest] Puzzled by leading dot

[Alexey Demakov]

The problem is not in escaping '.'.
Do you have rules to skip whitespaces in Lexer?
You have to instruct ANTLR what to do with them.
Look in docs & example grammars for rules like this:

protected
NL : (   {LA(2) == '\n'}? '\r' '\n'
       | '\r'
       | '\n'
     )
     { newline(); }
   ;

WS : ( options { greedy = true; } :
          ' '
       | '\t'
       | '\f'
       | NL
     )+
     { _ttype = Token.SKIP; }
   ;

Regards,
Alexey

-----
Alexey Demakov
TreeDL: Tree Description Language: http://treedl.sourceforge.net
RedVerst Group: http://www.unitesk.com


----- Original Message ----- 
From: "Juergen Weber" <weberjn at yahoo.com>
To: <antlr-interest at antlr.org>
Sent: Tuesday, March 15, 2005 8:19 PM
Subject: [antlr-interest] Puzzled by leading dot


> Thanks Alexey,
> 
> I changed to 
> 
> ...extends Lexer;
> 
> DOTSE:
> 
>    ".SE"
> ;
> 
> But still
> 
> Exception in thread "main" line 1:4: unexpected char:
> ' '
> 
> Do I have to quote the dot? How?
> 
> Thanks,
> Juergen