[antlr-interest] I want to throw an exception and stop parse, please!

[Kevin Chen]

thanks for your reply!

But, there's no throws in original recover method:

    public void recover(IntStream input, RecognitionException re)

Thus, I can't throw an exception in overriding recover method. :-)

Thanks a lot!

THE
     POWER
             OF
                JAVA













>Ah, forgot. Things changed after the book was written. I 
guess you have to override the following two methods from 
>BaseRecognizer
> 

>void  recover (IntStream input, RecognitionException 
re)
>Object  recoverFromMismatchedSet (IntStream input, 
RecognitionException e, BitSet follow) throws 
RecognitionException

>Cheers, Indhu
 

  /*******************************************************/
/*******************************************************/

>>Thanks for your reply!
>>
>>I cannot find "mismatch" method in "org.antlr.runtime.Parser" and 
  "org.antlr.runtime.BaseRecognizer" both, just found >>"recoverFromMismatchedSet" 
  method in "org.antlr.runtime.BaseRecognizer".      
  :-)
>>
>>My antlr runtime version is 3.1.3.
>>
>>Thanks a 
  lot!     :-)

  

  >>>Two methods of parser (mismatch and 
    recoverFromMismatchedSet) are responsible for auto-recovery and showing 
    >error messages.
    >>> 

    >>>If you want to throw an 
    exception and exit right on the first error you need to override these 
    methods and >just throw 
    the exception instead of handling it.
    >>> 

    >>>Something like 
    this:
    >>> 

    >>>@members 
{

    >>>protected void 
    mismatch(IntStream input, int ttype, BitSet follow)
>>>throws 
    RecognitionException
>>>{
>>>throw 
    new MismatchedTokenException(ttype, input);
>>>}>>>
    >>>public void 
    recoverFromMismatchedSet(IntStream input, RecognitionException e, BitSet 
    follow)>>>
    >>>throws 
    RecognitionException>>>
    >>>{>>>
    >>>throw e;>>>
    >>>}>>> 
    >>>}
>>> 
    

    >>>Cheers, 
  Indhu 
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