gistfile1.txt

direction : NORTHEAST
          | NORTHWEST
          | SOUTHEAST
          | NORTH
          | SOUTH
          | EAST
          | WEST
          | N E
          | N W
          | S E
          | S W
          | N
          | S
          | E
          | W
          ;

NORTHEAST : N O R T H E A S T ;
NORTHWEST : N O R T H W E S T ;
SOUTHEAST : S O U T H E A S T ;
SOUTHWEST : S O U T H W E S T ;
NORTH     : N O R T H ;
SOUTH     : S O U T H ;
EAST      : E A S T ;
WEST      : W E S T ;

/* Case insensitive lexer fragments */
fragment A:('a'|'A');
fragment B:('b'|'B');
fragment C:('c'|'C');
fragment D:('d'|'D');
fragment E:('e'|'E');
fragment F:('f'|'F');
fragment G:('g'|'G');
fragment H:('h'|'H');
fragment I:('i'|'I');
fragment J:('j'|'J');
fragment K:('k'|'K');
fragment L:('l'|'L');
fragment M:('m'|'M');
fragment N:('n'|'N');
fragment O:('o'|'O');
fragment P:('p'|'P');
fragment Q:('q'|'Q');
fragment R:('r'|'R');
fragment S:('s'|'S');
fragment T:('t'|'T');
fragment U:('u'|'U');
fragment V:('v'|'V');
fragment W:('w'|'W');
fragment X:('x'|'X');
fragment Y:('y'|'Y');
fragment Z:('z'|'Z');