/**
* @param Operator $op
*
* @return string
*/
public function visitOperator(Operator $op)
{
return '(' . $op->firstOperand()->accept($this) . $op->operator() . $op->secondOperand()->accept($this) . ')';
}
/**
* @param Operator $op
*
* @return string
*/
public function visitOperator(Operator $op, $parentOperator = null)
{
$currentOperator = $op->operator();
$expression = $op->firstOperand()->accept($this, $currentOperator) . $currentOperator . $op->secondOperand()->accept($this, $currentOperator);
return $this->requireParentheses($currentOperator, $parentOperator) ? '(' . $expression . ')' : $expression;
}