How to use

isOperator

method

in

org.matheclipse.parser.client.operator.InfixOperator

private ASTNode parseCompoundExpressionNull(InfixOperator infixOperator, ASTNode rhs) {
  if (infixOperator.isOperator(";")) {
    if (fToken == TT_EOF || fToken == TT_ARGUMENTS_CLOSE || fToken == TT_LIST_CLOSE
        || fToken == TT_PRECEDENCE_CLOSE || fToken == TT_COMMA) {
      return infixOperator.createFunction(fFactory, rhs, fFactory.createSymbol("Null"));
    }
    if (fPackageMode && fRecursionDepth < 1) {
      return infixOperator.createFunction(fFactory, rhs, fFactory.createSymbol("Null"));
    }
  }
  return null;
}

  || ((infixOperator.getPrecedence() == min_precedence)
      && (infixOperator.getGrouping() == InfixOperator.RIGHT_ASSOCIATIVE))) {
if (infixOperator.isOperator(";")) {
  if (fPackageMode && fRecursionDepth < 1) {
    return infixOperator.createFunction(fFactory, rhs, fFactory.createSymbol("Null"));