/**
* undocumented function
*
* @param XPath\Expression $xpath The XPath expression
* @return XPath\Expression The modified expression
*/
protected function xpath_empty($xpath)
{
$xpath->addCondition('not(*) and not(normalize-space())');
return $xpath;
}
/**
* undocumented function
*
* @param XPath\Expression $xpath
* @param mixed $expr
* @return XPath\Expression
*/
protected function xpath_not(XPath\Expression $xpath, $expr)
{
// everything for which not expr applies
if ($expr instanceof ElementSelector) {
$xpath->addCondition(sprintf("not(name() = '%s')", $expr->toXpath()));
return $xpath;
}
$expr = $expr->toXPath();
$cond = $expr->getCondition();
if ($cond) {
// FIXME: should I do something about element_path?
$xpath->addCondition(sprintf('not(%s)', $cond));
} else {
$xpath->addCondition('0');
}
return $xpath;
}