How to use

ASTNodeFactory$SubtractOperator

in

org.matheclipse.parser.client.operator

static public InfixOperator createInfixOperator(final String operatorStr, final String headStr,
    final int precedence, final int grouping) {
  InfixOperator oper;
  if (headStr.equals("Apply")) {
    oper = new ApplyOperator(operatorStr, headStr, precedence, grouping);
  } else if (headStr.equals("Divide")) {
    oper = new DivideOperator(operatorStr, headStr, precedence, grouping);
  } else if (headStr.equals("Subtract")) {
    oper = new SubtractOperator(operatorStr, headStr, precedence, grouping);
  } else {
    oper = new InfixOperator(operatorStr, headStr, precedence, grouping);
  }
  return oper;
}