[antlr-interest] question about example 'ANTLR masquerading as SED'

[corno at dds.nl]

Hi all,

The following example is from the reference manual.

class T extends Lexer;
options {
  k=2;
  filter=IGNORE;
  charVocabulary = '\3'..'\177';
}

protected
IGNORE
  :  ( "\r\n" | '\r' | '\n' )
     {newline(); System.out.println("");}
  |  c:. {System.out.print(c);}
  ;


but it gives a warning about nondeterminism. However, when I comment out the 
last code block (behind c:.), there's no warning, which seems strange to me as 
it does not alter the logic (or does it).
Can anybody tell me:
a) Why this is
b) If this can be ignored
c) If not, how this can be solved

TIA,

Corno

 

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