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PhutilRemarkupRuleHyperlink.php
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Created
Thu, Nov 21, 19:17

PhutilRemarkupRuleHyperlink.php
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<?php
/**
* @group markup
* @concrete-extensible (TODO only needed by Facebook at the moment)
*/
class PhutilRemarkupRuleHyperlink
extends PhutilRemarkupRule {
public function apply($text) {
// Hyperlinks with explicit "<>" around them get linked exactly, without
// the "<>". Angle brackets are basically special and mean "this is a URL
// with weird characters". This is assumed to be reasonable because they
// don't appear in normal text or normal URLs.
$text = preg_replace_callback(
'@[<](\w{3,}://.+?)[>]@',
array($this, 'markupHyperlink'),
$text);
// Hyperlinks with explicit "()" around them get linked exactly, with the
// "()". This is simlar to angle brackets, except that people use parens
// in normal text so we preserve them in the output text.
$text = preg_replace_callback(
'@(?<=\\()(\w{3,}://.+?)(?=\\))@',
array($this, 'markupHyperlink'),
$text);
// Anything else we match "ungreedily", which means we'll look for
// stuff that's probably puncutation or otherwise not part of the URL and
// not link it. This lets someone write "QuicK! Go to
// http://www.example.com/!". We also apply some paren balancing rules.
$text = preg_replace_callback(
'@(?<=^|\s)(\w{3,}://\S+)(?=\s|$)@',
array($this, 'markupHyperlinkUngreedy'),
$text);
return $text;
}
protected function markupHyperlink($matches) {
$protocols = $this->getEngine()->getConfig(
'uri.allowed-protocols',
array());
$protocol = id(new PhutilURI($matches[1]))->getProtocol();
if (!idx($protocols, $protocol)) {
// If this URI doesn't use a whitelisted protocol, don't link it. This
// is primarily intended to prevent javascript:// silliness.
return $this->getEngine()->storeText(phutil_escape_html($matches[1]));
}
return $this->storeRenderedHyperlink($matches[1]);
}
protected function storeRenderedHyperlink($link) {
return $this->getEngine()->storeText($this->renderHyperlink($link));
}
protected function renderHyperlink($link) {
return phutil_render_tag(
'a',
array(
'href' => $link,
'target' => '_blank',
),
phutil_escape_html($link));
}
private function markupHyperlinkUngreedy($matches) {
$match = $matches[1];
$tail = null;
$trailing = null;
if (preg_match('/[;,.:!?]+$/', $match, $trailing)) {
$tail = $trailing[0];
$match = substr($match, 0, -strlen($tail));
}
// If there's a closing paren at the end but no balancing open paren in
// the URL, don't link the close paren. This is an attempt to gracefully
// handle the two common paren cases, Wikipedia links and English language
// parentheticals, e.g.:
//
// http://en.wikipedia.org/wiki/Noun_(disambiguation)
// (see also http://www.example.com)
//
// We could apply a craftier heuristic here which tries to actually balance
// the parens, but this is probably sufficient.
if (preg_match('/\\)$/', $match) && !preg_match('/\\(/', $match)) {
$tail = ')'.$tail;
$match = substr($match, 0, -1);
}
return $this->markupHyperlink(array(null, $match)).$tail;
}
}

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