/** @internal */
static function _evalPath($node, $path, $context)
{
if ($node === null) {
// nothing is passed in current matcher, this happens when p₁ in single(p₁, p₂) matches nothing
return null;
} else {
if ($path instanceof Matcher || $path instanceof \Closure) {
// key => multipath
return $path($node, $context);
} elseif (is_array($path) || is_object($path)) {
// key => array(paths)
return Matcher::_extractPaths($node, $path, $context);
} elseif (is_string($path)) {
// key => path
$matches = $context->xpathAll($node, $path);
if (is_scalar($matches)) {
return $matches;
} else {
if (count($matches) === 0) {
return null;
} else {
return call_user_func($context->getExtractor(), $matches[0]);
}
}
} elseif (is_int($path)) {
// key => position of child element
$ns = $context->position($node, $path);
return empty($ns) ? null : call_user_func($context->getExtractor(), reset($ns));
} else {
throw new \Exception("Invalid path. Expected string, int, array, stdClass object, Matcher object of function, " . gettype($path) . " given");
}
}
}
