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PhutilRemarkupDocumentLinkRule.php
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Mon, May 6, 11:44

PhutilRemarkupDocumentLinkRule.php
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<?php
final class PhutilRemarkupDocumentLinkRule extends PhutilRemarkupRule {
public function getPriority() {
return 150.0;
}
public function apply($text) {
// Handle mediawiki-style links: [[ href | name ]]
$text = preg_replace_callback(
'@\B\\[\\[([^|\\]]+)(?:\\|([^\\]]+))?\\]\\]\B@U',
array($this, 'markupDocumentLink'),
$text);
// Handle markdown-style links: [name](href)
$text = preg_replace_callback(
'@'.
'\B'.
'\\[([^\\]]+)\\]'.
'\\('.
'(\s*'.
// See T12343. This is making some kind of effort to implement
// parenthesis balancing rules. It won't get nested parentheses
// right, but should do OK for Wikipedia pages, which seem to be
// the most important use case.
// Match zero or more non-parenthesis, non-space characters.
'[^\s()]*'.
// Match zero or more sequences of "(...)", where two balanced
// parentheses enclose zero or more normal characters. If we
// match some, optionally match more stuff at the end.
'(?:(?:\\([^ ()]*\\))+[^\s()]*)?'.
'\s*)'.
'\\)'.
'\B'.
'@U',
array($this, 'markupAlternateLink'),
$text);
return $text;
}
protected function renderHyperlink($link, $name) {
$engine = $this->getEngine();
$is_anchor = false;
if (strncmp($link, '/', 1) == 0) {
$base = $engine->getConfig('uri.base');
$base = rtrim($base, '/');
$link = $base.$link;
} else if (strncmp($link, '#', 1) == 0) {
$here = $engine->getConfig('uri.here');
$link = $here.$link;
$is_anchor = true;
}
if ($engine->isTextMode()) {
// If present, strip off "mailto:" or "tel:".
$link = preg_replace('/^(?:mailto|tel):/', '', $link);
if (!strlen($name)) {
return $link;
}
return $name.' <'.$link.'>';
}
if (!strlen($name)) {
$name = $link;
$name = preg_replace('/^(?:mailto|tel):/', '', $name);
}
if ($engine->getState('toc')) {
return $name;
}
$same_window = $engine->getConfig('uri.same-window', false);
if ($same_window) {
$target = null;
} else {
$target = '_blank';
}
// For anchors on the same page, always stay here.
if ($is_anchor) {
$target = null;
}
return phutil_tag(
'a',
array(
'href' => $link,
'class' => 'remarkup-link',
'target' => $target,
'rel' => 'noreferrer',
),
$name);
}
public function markupAlternateLink(array $matches) {
$uri = trim($matches[2]);
// NOTE: We apply some special rules to avoid false positives here. The
// major concern is that we do not want to convert `x[0][1](y)` in a
// discussion about C source code into a link. To this end, we:
//
// - Don't match at word boundaries;
// - require the URI to contain a "/" character or "@" character; and
// - reject URIs which being with a quote character.
if ($uri[0] == '"' || $uri[0] == "'" || $uri[0] == '`') {
return $matches[0];
}
if (!strlen($uri[0])) {
return $matches[0];
}
if (strpos($uri, '/') === false &&
strpos($uri, '@') === false &&
strncmp($uri, 'tel:', 4)) {
return $matches[0];
}
return $this->markupDocumentLink(
array(
$matches[0],
$matches[2],
$matches[1],
));
}
public function markupDocumentLink(array $matches) {
$uri = trim($matches[1]);
$name = trim(idx($matches, 2));
// If whatever is being linked to begins with "/" or "#", or has "://",
// or is "mailto:" or "tel:", treat it as a URI instead of a wiki page.
$is_uri = preg_match('@(^/)|(://)|(^#)|(^(?:mailto|tel):)@', $uri);
if ($is_uri && strncmp('/', $uri, 1) && strncmp('#', $uri, 1)) {
$protocols = $this->getEngine()->getConfig(
'uri.allowed-protocols',
array());
try {
$protocol = id(new PhutilURI($uri))->getProtocol();
if (!idx($protocols, $protocol)) {
// Don't treat this as a URI if it's not an allowed protocol.
$is_uri = false;
}
} catch (Exception $ex) {
// We can end up here if we try to parse an ambiguous URI, see
// T12796.
$is_uri = false;
}
}
// As a special case, skip "[[ / ]]" so that Phriction picks it up as a
// link to the Phriction root. It is more useful to be able to use this
// syntax to link to the root document than the home page of the install.
if ($uri == '/') {
$is_uri = false;
}
if (!$is_uri) {
return $matches[0];
}
return $this->getEngine()->storeText($this->renderHyperlink($uri, $name));
}
}

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