[antlr-interest] Need help on my grammar

[fung li]

Hi all,

The following grammar trys to recognize "129 Park Avenue" or "36-129 Park 
Avenue".
When I compiled the following grammar with k=1 in TreeParser section, I got 
an error message:

addr.g:59: warning: nondeterminism upon
addr.g:59:      k==1:NUMBER
addr.g:59:      between alts 1 and 2 of block


However, with k=2, I got:

addr.g:59: warning: nondeterminism upon
addr.g:59:      k==1:NUMBER
addr.g:59:      k==2:NULL_TREE_LOOKAHEAD
addr.g:59:      between alts 1 and 2 of block

In this case, what should I do ?

Thanks in advance.
Ben

--------------------------------------------------
class MyParser extends Parser;
options {
defaultErrorHandler=false;
buildAST=true ;
k = 2;
}

startRule: address_detail
        { System.out.println ( "->>>>> OK" ); };

address_detail : NUMBER^ STREETNAME streettype
                     | NUMBER^ DASH NUMBER STREETNAME streettype
                    ;

streettype: "AVENUE" | "STREET" ;

class MyLexer extends Lexer;
options {
charVocabulary = '\3'..'\377' ;
testLiterals=false ;
}

WS : ( ' ' | '\t' | '\n' | '\r' )
    { $setType(Token.SKIP) ; } ;

COMMA: ','
    { $setType(Token.SKIP) ; } ;

DASH: '-'
   ;

STREETNAME
options {
   testLiterals = true ;
}
: ( 'a'..'z' | 'A'..'Z' )+
;

NUMBER: ( '0'..'9' )+
;

class AddrTreeWalker extends TreeParser;
options {
k = 2 ;
}

myexpr returns [ String r ]
{
  String postr="" ;
  String addrstr="" ;
  r = "" ;
}
  : addrstr=address_detail
  {
      r = "ADDR=" + addrstr ;
  }
  ;

address_detail returns [ String r ]
{
  String stnt ;
  StringBuffer stnameB = new StringBuffer();
  String stno1 = "" ;
  String stno2 = "" ;
  int stncount = 0 ;
  r = "" ;
}
  : #( stno:NUMBER      { stno1 = stno.getText() ; }
        stna:STREETNAME
        stnt=streettype
    )
    {
         r = " stno=" + stno1
                   + ",stna=" + stna.getText()
                   + ",stnt=" + stnt
           ;
    }
   |   #( st2:NUMBER      { stno1 = st2.getText() ; }
        DASH
        st3:NUMBER      { stno2 = st3.getText(); }
        stna2:STREETNAME
       stnt=streettype
    )
    {
         r = " appno=" + stno1
                   + ",stno=" + stno2
                   + ",stna=" + stna2.getText()
                   + ",stnt=" + stnt
           ;
    }



  ;

streettype returns [ String r ]
{
r = "" ;
}
     : "AVENUE"
     | "STREET"
     ;






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