[antlr-interest] nondeterminism issue

[Michiel Vermandel]

Hi,

I get quite some warnings when parsing my grammar and I'm trying to 
understand why.
I started with the lexer and I isolated one warning.

My lexer is now reduced to: see below.

When I parse this grammar file I get:

ANTLR Parser Generator   Version 2.7.5rc2 (2005-01-08)   1989-2005 
jGuru.com
FormsLexerSnip.g:17:35: warning:lexical nondeterminism between alts 1 and 
2 of block upon
FormsLexerSnip.g:17:35:     k==1:'\n'
FormsLexerSnip.g:17:35:     k==2:<end-of-token>,'\t','\n','\r',' '
FormsLexerSnip.g:17:35:     k==3:<end-of-token>,'\t','\n','\r',' '
FormsLexerSnip.g:17:35:     k==4:<end-of-token>,'\t','\n','\r',' '
Press any key to continue . . .

Can anyone explain me why I get this warning?

Thanks

Michiel


Lexer:
----------------------------------------------------------------
class FormsLexer extends Lexer;

options {
                exportVocab = Forms;
                testLiterals = false;
                k = 4;
                caseSensitive = false;
                caseSensitiveLiterals = false;
                charVocabulary = '\3' .. '\177';
        }

WS      :       (   ' '
                    |   '\t'
                    |   ('\n'|'\r'('\n')?) {newline();}
                  )+
                { $setType(Token.SKIP); }
   ;
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://www.antlr.org/pipermail/antlr-interest/attachments/20060706/b65c4aa4/attachment.html