grammar regions;

@header{
package regionsparser;
import blah.blub.*;
}

@members {
  public String asdf = "Hello World!";
}

start :  region EOF;

region returns [Region r]:
     UNITCIRCLE { r = new UnitCircle(); }
     |
     UNION LPAR r1=region COMMA r2=region RPAR
     { r = new UnionRegion(r1,r2); }
     |
     SCALE LPAR n=number COMMA r1=region RPAR
     { r = new ScaleRegion(n,r1); }
     ;

number returns [int value]
    :   i=INT {value = Integer.parseInt(i.text);} ;

UNION : 'union' ;
SCALE : 'scale' ;
UNITCIRCLE : 'unitcircle' ;
LPAR : '(';
RPAR : ')';
COMMA : ',';
INT :   '0'..'9'+ ;