public static function create($url, $followHtml = false, $recursions = 0)
{
if ($recursions > 2) {
throw new Exception("Download error", FeedParser::ERROR_TOO_MANY_REDIRECTS);
}
$originalUrl = $url;
$document = FeedParser::fetchDocument($url);
if (!$document) {
throw new Exception("Document is empty", FeedParser::ERROR_EMPTY_DOCUMENT);
}
// First pass - parse it as valid XML
$xmlDocument = null;
$parser = null;
$links = array();
libxml_use_internal_errors(true);
try {
$xmlDocument = @new SimpleXMLElement($document);
} catch (Exception $e) {
}
if ($xmlDocument === null) {
// Document didn't parse as valid XML
$errors = libxml_get_errors();
foreach ($errors as $error) {
if ($error->code == 9) {
// PCDATA Invalid char value
$document = preg_replace('/[\\x00-\\x1f\\x80-\\xff]/', '', $document);
// Reparse the document
try {
$xmlDocument = @new SimpleXMLElement($document);
} catch (Exception $e) {
}
break;
}
}
}
if ($xmlDocument === null && $followHtml) {
// Not sure if this is ideal, but let's just blindly assume
// this is an HTML document and try to parse any rel=alternate
// links
$links = FeedParser::extractLinks($url, $document);
if (count($links) > 0) {
if ($parser = FeedParser::create($links[0]->url, $followHtml, $recursions + 1)) {
$parser->links[] = $url;
if ($url != $originalUrl) {
$parser->links[] = $originalUrl;
}
}
return $parser;
}
}
if ($xmlDocument) {
// Valid XML. See if we can determine the type of content
$rootName = $xmlDocument->getName();
if ($rootName == 'feed') {
$parser = new AtomParser();
} else {
if ($rootName == 'rss' || $rootName == 'RDF') {
$parser = new RssParser();
} else {
if ($followHtml && strcasecmp($rootName, 'html') === 0) {
// HTML document. See if we can find a feed by parsing the HTML
$links = FeedParser::extractLinks($url, $document);
if (count($links) > 0) {
if ($parser = FeedParser::create($url, $followHtml, $recursions + 1)) {
$parser->links[] = $url;
if ($url != $originalUrl) {
$parser->links[] = $originalUrl;
}
}
return $parser;
}
}
}
}
}
if ($parser) {
$parser->url = $url;
$parser->document = $document;
$parser->xml = $xmlDocument;
}
return $parser;
}
