[antlr-interest] wierdness - or perhaps my ignorance

[genericised]

class SillyLexer extends Lexer;
options { filter=BLAH; }

protected BLAH    : { 
  $setType(Token.SKIP);
  System.out.println("ignoring: "+getText());
} ;
---------------------------------------------------

called from a main like so:

---------------------------------------------------
while(true) {
   try {
      sillyLexer.nextToken();   
   } catch(Exception e) {}
}
---------------------------------------------------

when executed, no output is generated and
the lexer gets stuck in an infinate loop, why?

I comprehend that if newlines were an issue I
would have to catch them otherwise the lexer
would be stuck on one line, but here input is
from stdin so newlines should not be an issue?

Note: I am not trying to achieve anything specific
here, I am just curious.

Davy


 

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