/**
* Joins an XPath expression as an adjacent of another.
*
* @param XPathExpr $xpath The parent XPath expression
* @param NodeInterface $sub The adjacent XPath expression
*
* @return XPathExpr An XPath instance
*/
protected function _xpath_direct_adjacent($xpath, $sub)
{
// when sub immediately follows xpath
$xpath->join('/following-sibling::', $sub->toXpath());
$xpath->addNameTest();
$xpath->addCondition('position() = 1');
return $xpath;
}
/**
* undocumented function
*
* @param XPathExpr $xpath The XPath expression
*
* @return XPathExpr The modified expression
*/
protected function xpath_empty($xpath)
{
$xpath->addCondition('not(*) and not(normalize-space())');
return $xpath;
}
/**
* undocumented function
*
* @param XPathExpr $xpath
* @param XPathExpr $expr
*
* @return XPathExpr
*/
protected function _xpath_not($xpath, $expr)
{
// everything for which not expr applies
$expr = $expr->toXpath();
$cond = $expr->getCondition();
// FIXME: should I do something about element_path?
$xpath->addCondition(sprintf('not(%s)', $cond));
return $xpath;
}
