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PhutilRemarkupRuleHyperlink.php
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Sun, Jul 6, 03:16

PhutilRemarkupRuleHyperlink.php
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<?php
/*
* Copyright 2012 Facebook, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/**
* @group markup
* @concrete-extensible (TODO only needed by Facebook at the moment)
*/
class PhutilRemarkupRuleHyperlink
extends PhutilRemarkupRule {
public function apply($text) {
$text = preg_replace_callback(
'@\B\\[\\[([^|\\]]+)(?:\\|([^\\]]+))?\\]\\]\B@U',
array($this, 'markupDocumentLink'),
$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 $this->getEngine()->storeText($matches[1]);
}
return $this->storeRenderedHyperlink($matches[1]);
}
protected function storeRenderedHyperlink($link) {
return $this->getEngine()->storeText($this->renderHyperlink($link));
}
protected function renderHyperlink($link, $name = null) {
return phutil_render_tag(
'a',
array(
'href' => $link,
'target' => '_blank',
),
phutil_escape_html($name === null ? $link : $name));
}
private function markupHyperlinkUngreedy($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;
}
public function markupDocumentLink($matches) {
$uri = trim($matches[1]);
$name = trim(idx($matches, 2, $uri));
// If whatever is being linked to begins with "/" or has "://", treat it
// as a URI instead of a wiki page.
$is_uri = preg_match('@(^/)|(://)@', $uri);
if ($is_uri) {
$protocols = $this->getEngine()->getConfig(
'uri.allowed-protocols',
array());
$protocol = id(new PhutilURI($uri))->getProtocol();
if (!idx($protocols, $protocol)) {
// Don't treat this as a URI if it's not an allowed protocol.
$is_uri = false;
}
}
if (!$is_uri) {
return $matches[0];
}
return $this->getEngine()->storeText($this->renderHyperlink($uri, $name));
}
}

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