[antlr-interest] ANTLR problem

[Scott Amort]

Hi,

Zulfiqar Malik wrote:
> i encounter an exception at the following line of code (for any
> token, in this particular case mNEWLINE in the lexer):
> 
>     if ( _createToken && _token==ANTLR_USE_NAMESPACE(antlr)nullToken &&
> _ttype!=ANTLR_USE_NAMESPACE(antlr)Token::SKIP ) {
>        _token = makeToken(_ttype);
>        _token->setText(text.substr(_begin, text.length()-_begin));
>     }
>     _returnToken = _token; // <--- CRASH ON THIS LINE
> 
> and it should crash since _returnToken is not initialized and points
> to an invalid memory address.

No, this is not the case.  _returnToken is a protected member of 
CharScanner (of which your lexer L is a derived class).  Otherwise you 
would have gotten a compiler error, because not only was _returnToken 
not initialised in your snippet, it wasn't even declared!

What is the exception you are receiving?  Make sure you put your test 
code in a try..catch block and see what information the exception is 
providing.

Best,
Scott