private function popOperator()
{
$op = array_pop($this->operators);
if ($op->type === '?') {
$else = array_pop($this->operands);
$colon = $op->colon;
$then = $op->then;
$condition = array_pop($this->operands);
$this->operands[] = OperatorFactory::createTernaryOperatorNode($condition, $op, $then, $colon, $else);
} elseif ($op->mode === Operator::MODE_UNARY) {
$operand = array_pop($this->operands);
$this->operands[] = OperatorFactory::createUnaryOperatorNode($op, $operand);
} else {
$right = array_pop($this->operands);
$left = array_pop($this->operands);
$this->operands[] = OperatorFactory::createBinaryOperatorNode($left, $op, $right);
}
}
