[antlr-interest] Help need with nondeterminism error

[Sharon Li]

Hi can someone pls help me with this nondeterminism error? 
I'm also not sure if I can use predicates this way. pls advice!
Thanks in advance.

ANTLR Parser Generator   Version 2.7.0   1989-2000 MageLang's jGur
lfile.g.txt:410: warning: nondeterminism upon
lfile.g.txt:410:        k==1:COLON,TIMES,POW,LT,GT
lfile.g.txt:410:        k==2:COLON,LPAREN,TIMES,POW,LT,GT
lfile.g.txt:410:        between alts 1 and 2 of block
lfile.g.txt:432: warning: nondeterminism upon
lfile.g.txt:432:        k==1:LT,GT
lfile.g.txt:432:        k==2:COLON,TIMES,POW,LT,GT,"conditional"
lfile.g.txt:432:        between alt 1 and exit branch of block

/********** fraction of parser code ***************************/

406: productions : (production)+;
407: 
408: production : predecessor /*conditional ( (YIELD) | (OYIELD))  successor */ ;
409: 
410: predecessor : subpredecessor_one
411:             | subpredecessor_two
412:    ;
413:
414: subpredecessor_two
415:      : (strictPred GT)=> strictPred GT rContext
416:       | strictPred
417:       ;
418:
419: subpredecessor_one 
420:   : (lContext LT strictPred GT)=> lContext LT strictPred GT rContext
421:         | lContext LT strictPred
422:        ;
423:     
424: strictPred : formalModules;
425:
426: rContext : (formalModules)=> formalModules
427:     | /*empty*/ ;
428: 
429: lContext  : (formalModules)=> formalModules
430:  | /*empty*/ ;
431:
432: formalModules : (formalModule)+;
433:
434: formalModule {String fsymbol;} : (fsymbol = symbol) (LPAREN  formalParameters RPAREN)? ;
435:
436: formalParameters : (formalParameter) (COMMA formalParameter)* ;
437: 
438: formalParameter : NAME;

symbol returns [String sym] {sym = null;}  
   : p:POW {sym = p.getText();}
   | lt:LT {sym = lt.getText();}
   | gt:GT {sym = gt.getText();}
   | col:COLON {sym = col.getText();}
   | times:TIMES {sym = times.getText();}
   ;

/******** lexer ***************/
COLON    : ':';
TIMES    : '*';
POW     : '^';
GT     : '>';
LT     : '<';

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