/**
* Extracts urls and their according open graph infos from a given string
*
* @param String $string Text to extract urls and open graph infos from
* @return OpenGraphURLCollection containing the extracted urls
*/
public static function extract($string)
{
$collection = new OpenGraphURLCollection();
if (Config::get()->OPENGRAPH_ENABLE) {
$regexp = StudipFormat::getStudipMarkups()['links']['start'];
$matched = preg_match_all('/' . $regexp . '/ms', $string, $matches, PREG_SET_ORDER);
foreach ($matches as $match) {
$url = $match[2];
if (!$url) {
continue;
}
if (!isLinkIntern($url)) {
$og_url = OpenGraphURL::fromURL($url);
if ($og_url && !$collection->find($og_url->id)) {
$og_url->store();
$collection[] = $og_url;
}
}
}
}
return $collection;
}
public function handleElement(&$token)
{
if ($token->name === 'a' && isset($token->attr['href'])) {
$token->attr['class'] = isLinkIntern($token->attr['href']) ? 'link-intern' : 'link-extern';
}
}
/**
* Stud.IP markup for hyperlinks (intern, extern).
* Has lower priority than [code], [img], etc
*/
protected static function markupLinks($markup, $matches)
{
if ($markup->isInsideOf('htmlAnchor') || $markup->isInsideOf('htmlImg')) {
return $matches[0];
}
$url = $matches[2];
$title = $matches[1] ?: $url;
$intern = isLinkIntern($url);
$url = TransformInternalLinks($url);
$linkmarkup = clone $markup;
$linkmarkup->removeMarkup('links');
$linkmarkup->removeMarkup('wiki-links');
return sprintf('<a class="%s" href="%s"%s>%s</a>', $intern ? 'link-intern' : 'link-extern', $url, $intern ? '' : ' target="_blank"', $linkmarkup->format($title));
}
