Hi

I'm new to ANTLR. I'm writting a simple parser for algebraic expressions. My grammar was:

E -> T | T + E

T -> F | F * T

F -> id | (E) | num



I've translated it to LL(1):

E -> TG

G -> +E |

T -> FH

H -> *T

F -> id | (E) | num



As far as I know the second grammar is LL(1) and shouldn parse without any problems. I coded it in javaCC and it works ok. The same grammar in ANTLR produces te following warning:

			

			zad1.g:25: warning:nondeterminism between alts 1 and 3 of block upon
			

			zad1.g:25:     k==1:EOF,PLUS,RPAREN
			

		

			

			class P extends Parser;
			

			

			options
			

			{
			

			k=1;
			

			}
			

			

			start:
			

			expression EOF
			

			;
			

			

			expression:
			

			part expCont       { System.out.println("exp"); }
			

			;
			

			

			expCont:
			

			PLUS expression    { System.out.println("ec1"); }
			

			|                      { System.out.println("ec2"); }
			

			;
			

			

			part:
			

			factor partCont    { System.out.println("part"); }
			

			;
			

			

			partCont:
			

			|   MULT part          { System.out.println("pc1"); }
			

			|                      { System.out.println("pc2"); }
			

			;
			

			

			factor:
			

			ID                          { System.out.println("f1"); }
			

			|   LPAREN expression RPAREN    { System.out.println("f2"); }
			

			|   NUMBER                      { System.out.println("f3"); }
			

			;
			

			

			

			//  Lexer
			

			class L extends Lexer;
			

			

			options
			

			{
			

			k=2;                               // needed for newline junk
			

			charVocabulary='u0000'..'u007F'; // allow ascii
			

			}
			

			

			LPAREN: '(' ;
			

			RPAREN: ')' ;
			

			PLUS  : '+' ;
			

			MULT  : '*' ;
			

			NUMBER: ('0'..'9') ('.' ('0'..'9')*)? ;
			

			ID:     ('a'..'z'|'A'..'Z') ('a'..'z'|'A'..'Z'|'0'..'9')* ;
			

			WS    : ( ' '
			

			| '
			

			' '
			

			'
			

			| '
			

			'
			

			| ' '
			

			)
			

			{$setType(Token.SKIP);} ;