コード例 #1
0
  @Override
  public Boolean visit(Eq ast) {
    boolean checkLhs = ast.getLhs().accept(this);
    boolean checkRhs = ast.getRhs().accept(this);

    if (!(checkLhs && checkRhs)) return false;
    Type lhsType = ast.getLhs().typeOf(env);
    Type rhsType = ast.getRhs().typeOf(env);

    if (!lhsType.isCompatibleTo(rhsType)) {
      addToErrorList(
          ast,
          "the operator == can not be applied to instances of type "
              + lhsType.getClass()
              + " and type "
              + rhsType.getClass());
      return false;
    }
    return true;
  }
コード例 #2
0
  @Override
  public Boolean visit(Not ast) {
    boolean checkArg = ast.getArg().accept(this);

    if (!checkArg) return false;

    Type argType = ast.getArg().typeOf(env);

    if (!argType.isCompatibleToBool()) {
      addToErrorList(
          ast,
          "the unary operator ! can not be applied to instances of type " + argType.getClass());
      return false;
    }
    return true;
  }