/**
* Parse an XML string (XRDS document) and return either a
* Services_Yadis_XRDS object or null, depending on whether the
* XRDS XML is valid.
*
* @param string $xml_string An XRDS XML string.
* @return mixed $xrds An instance of Services_Yadis_XRDS or null,
* depending on the validity of $xml_string
*/
function &parseXRDS($xml_string, $extra_ns_map = null)
{
$_null = null;
if (!$xml_string) {
return $_null;
}
$parser = Services_Yadis_getXMLParser();
$ns_map = Services_Yadis_getNSMap();
if ($extra_ns_map && is_array($extra_ns_map)) {
$ns_map = array_merge($ns_map, $extra_ns_map);
}
if (!($parser && $parser->init($xml_string, $ns_map))) {
return $_null;
}
// Try to get root element.
$root = $parser->evalXPath('/xrds:XRDS[1]');
if (!$root) {
return $_null;
}
if (is_array($root)) {
$root = $root[0];
}
$attrs = $parser->attributes($root);
if (array_key_exists('xmlns:xrd', $attrs) && $attrs['xmlns:xrd'] != 'xri://$xrd*($v*2.0)') {
return $_null;
} else {
if (array_key_exists('xmlns', $attrs) && preg_match('/xri/', $attrs['xmlns']) && $attrs['xmlns'] != 'xri://$xrd*($v*2.0)') {
return $_null;
}
}
// Get the last XRD node.
$xrd_nodes = $parser->evalXPath('/xrds:XRDS[1]/xrd:XRD');
if (!$xrd_nodes) {
return $_null;
}
$xrds = new Services_Yadis_XRDS($parser, $xrd_nodes);
return $xrds;
}
function detect_xml($r, &$out)
{
global $__Services_Yadis_xml_extensions;
$out .= $r->h2('XML Support');
// Try to get an XML extension.
$ext = Services_Yadis_getXMLParser();
if ($ext !== null) {
$out .= $r->p('XML parsing support is present using the ' . $r->b(get_class($ext)) . ' interface.');
return true;
} else {
$out .= $r->p('XML parsing support is absent; please install one ' . 'of the following PHP extensions:');
foreach ($__Services_Yadis_xml_extensions as $name => $cls) {
$out .= "<li>" . $r->b($name) . "</li>";
}
return false;
}
}
