I have the following input as an example of the format I want.
(A = 'a' AND B != 'something') OR (C != 'abc*') OR (D != 'xyz' AND D != 'wui')
I have the following ANTLR grammar, unfortunately it isn't working for what I need.
grammar Parser;
prog: expr*;
expr: LEFTPAREN expr RIGHTPAREN
| expr (AND|OR) expr
| LEFTPAREN equation RIGHTPAREN
| equation
;
equation : identifier equality value
| LEFTPAREN equation RIGHTPAREN
;
equality : (EQUALS | NOTEQUALS);
identifier : ID;
value : STRING;
LEFTPAREN : '(';
RIGHTPAREN : ')';
AND : '&&';
OR : '||';
EQUALS : '=';
NOTEQUALS : '!=';
NEWLINE : [\r\n]+ ;
STRING : ('"'|'\'') ('a'..'z'|'A'..'Z'|'0'..'9'|'*'|'_'|'-')* ('"'|'\'');
ID : ('a'..'z'|'A'..'Z')+;
INT : '0'..'9'+;
WS : [ \t\n\r]+ -> skip ;
When I run antlr4 utility to run this
line 1:9 no viable alternative at input '(A='a'AND' line 1:13 extraneous input 'B' expecting {'=', '!='} line 1:29 mismatched input ')' expecting STRING line 1:34 mismatched input '(' expecting {'=', '!='} line 1:51 mismatched input '(' expecting {'=', '!='} line 1:67 extraneous input 'D' expecting {'=', '!='} line 1:77 mismatched input ')' expecting STRING
and I get this tree 
I'm still trying to understand and learn ANTLR4 but can anyone give me some pointers on getting this to work?
