compute method

@override dynamic compute(SymbolTable? scope)

Implementation

@override
dynamic compute(scope) {
  var l = left.compute(scope), r = right.compute(scope);

  switch (operator.type) {
    case TokenType.asterisk:
      return l * r;
    case TokenType.slash:
      return l / r;
    case TokenType.plus:
      if (l is String || r is String) return l.toString() + r.toString();
      return l + r;
    case TokenType.minus:
      return l - r;
    case TokenType.lt:
      return l < r;
    case TokenType.gt:
      return l > r;
    case TokenType.lte:
      return l <= r;
    case TokenType.gte:
      return l >= r;
    case TokenType.equ:
      return l == r;
    case TokenType.nequ:
      return l != r;
    case TokenType.elvis:
      return l ?? r;
    default:
      throw UnsupportedError(
          'Unsupported binary operator: "${operator.span.text}".');
  }
}