public function render()
{
$operands = array();
foreach ($this->_operands as $opr) {
if ($opr instanceof Expression) {
$opr_rendered = $opr->render();
$num_oprs = $opr->getNumOperands();
if ($num_oprs > 1) {
$opr_rendered = '(' . $opr_rendered . ')';
}
$opr = $opr_rendered;
}
$operands[] = $opr;
}
$operator = Operator::toHtml($this->_operator);
if (false !== ($decorator = $this->getDecorator('operator'))) {
$operator = $decorator->decorate($operator);
}
switch (sizeof($operands)) {
case 1:
$format = '%s %s';
$params = array($operator, $operands[0]);
break;
case 2:
$format = '%s %s %s';
$params = array($operands[0], $operator, $operands[1]);
break;
}
$expression = vsprintf($format, $params);
if (false !== ($decorator = $this->getDecorator('expression'))) {
$expression = $decorator->decorate($expression);
}
return $expression;
}
