Viewing file:  UrlAutolinkProcessor.php (6.96 KB) -rwxrwxrwx
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<?php
/*
* This file is part of the league/commonmark package.
*
* (c) Colin O'Dell <colinodell@gmail.com>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace League\CommonMark\Extension\Autolink;
use League\CommonMark\Event\DocumentParsedEvent;
use League\CommonMark\Inline\Element\Link;
use League\CommonMark\Inline\Element\Text;
final class UrlAutolinkProcessor
{
// RegEx adapted from https://github.com/symfony/symfony/blob/4.2/src/Symfony/Component/Validator/Constraints/UrlValidator.php
const REGEX = '~
(?<=^|[ \\t\\n\\x0b\\x0c\\x0d*_\\~\\(]) # Can only come at the beginning of a line, after whitespace, or certain delimiting characters
(
# Must start with a supported scheme + auth, or "www"
(?:
(?:%s):// # protocol
(?:([\.\pL\pN-]+:)?([\.\pL\pN-]+)@)? # basic auth
|www\.)
(?:
(?:[\pL\pN\pS\-\.])+(?:\.?(?:[\pL\pN]|xn\-\-[\pL\pN-]+)+\.?) # a domain name
| # or
\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3} # an IP address
| # or
\[
(?:(?:(?:(?:(?:(?:(?:[0-9a-f]{1,4})):){6})(?:(?:(?:(?:(?:[0-9a-f]{1,4})):(?:(?:[0-9a-f]{1,4})))|(?:(?:(?:(?:(?:25[0-5]|(?:[1-9]|1[0-9]|2[0-4])?[0-9]))\.){3}(?:(?:25[0-5]|(?:[1-9]|1[0-9]|2[0-4])?[0-9])))))))|(?:(?:::(?:(?:(?:[0-9a-f]{1,4})):){5})(?:(?:(?:(?:(?:[0-9a-f]{1,4})):(?:(?:[0-9a-f]{1,4})))|(?:(?:(?:(?:(?:25[0-5]|(?:[1-9]|1[0-9]|2[0-4])?[0-9]))\.){3}(?:(?:25[0-5]|(?:[1-9]|1[0-9]|2[0-4])?[0-9])))))))|(?:(?:(?:(?:(?:[0-9a-f]{1,4})))?::(?:(?:(?:[0-9a-f]{1,4})):){4})(?:(?:(?:(?:(?:[0-9a-f]{1,4})):(?:(?:[0-9a-f]{1,4})))|(?:(?:(?:(?:(?:25[0-5]|(?:[1-9]|1[0-9]|2[0-4])?[0-9]))\.){3}(?:(?:25[0-5]|(?:[1-9]|1[0-9]|2[0-4])?[0-9])))))))|(?:(?:(?:(?:(?:(?:[0-9a-f]{1,4})):){0,1}(?:(?:[0-9a-f]{1,4})))?::(?:(?:(?:[0-9a-f]{1,4})):){3})(?:(?:(?:(?:(?:[0-9a-f]{1,4})):(?:(?:[0-9a-f]{1,4})))|(?:(?:(?:(?:(?:25[0-5]|(?:[1-9]|1[0-9]|2[0-4])?[0-9]))\.){3}(?:(?:25[0-5]|(?:[1-9]|1[0-9]|2[0-4])?[0-9])))))))|(?:(?:(?:(?:(?:(?:[0-9a-f]{1,4})):){0,2}(?:(?:[0-9a-f]{1,4})))?::(?:(?:(?:[0-9a-f]{1,4})):){2})(?:(?:(?:(?:(?:[0-9a-f]{1,4})):(?:(?:[0-9a-f]{1,4})))|(?:(?:(?:(?:(?:25[0-5]|(?:[1-9]|1[0-9]|2[0-4])?[0-9]))\.){3}(?:(?:25[0-5]|(?:[1-9]|1[0-9]|2[0-4])?[0-9])))))))|(?:(?:(?:(?:(?:(?:[0-9a-f]{1,4})):){0,3}(?:(?:[0-9a-f]{1,4})))?::(?:(?:[0-9a-f]{1,4})):)(?:(?:(?:(?:(?:[0-9a-f]{1,4})):(?:(?:[0-9a-f]{1,4})))|(?:(?:(?:(?:(?:25[0-5]|(?:[1-9]|1[0-9]|2[0-4])?[0-9]))\.){3}(?:(?:25[0-5]|(?:[1-9]|1[0-9]|2[0-4])?[0-9])))))))|(?:(?:(?:(?:(?:(?:[0-9a-f]{1,4})):){0,4}(?:(?:[0-9a-f]{1,4})))?::)(?:(?:(?:(?:(?:[0-9a-f]{1,4})):(?:(?:[0-9a-f]{1,4})))|(?:(?:(?:(?:(?:25[0-5]|(?:[1-9]|1[0-9]|2[0-4])?[0-9]))\.){3}(?:(?:25[0-5]|(?:[1-9]|1[0-9]|2[0-4])?[0-9])))))))|(?:(?:(?:(?:(?:(?:[0-9a-f]{1,4})):){0,5}(?:(?:[0-9a-f]{1,4})))?::)(?:(?:[0-9a-f]{1,4})))|(?:(?:(?:(?:(?:(?:[0-9a-f]{1,4})):){0,6}(?:(?:[0-9a-f]{1,4})))?::))))
\] # an IPv6 address
)
(?::[0-9]+)? # a port (optional)
(?:/ (?:[\pL\pN\-._\~!$&\'()*+,;=:@]|%%[0-9A-Fa-f]{2})* )* # a path
(?:\? (?:[\pL\pN\-._\~!$&\'()*+,;=:@/?]|%%[0-9A-Fa-f]{2})* )? # a query (optional)
(?:\# (?:[\pL\pN\-._\~!$&\'()*+,;=:@/?]|%%[0-9A-Fa-f]{2})* )? # a fragment (optional)
)~ixu';
/** @var string */
private $finalRegex;
/**
* @param array<int, string> $allowedProtocols
*/
public function __construct(array $allowedProtocols = ['http', 'https', 'ftp'])
{
$this->finalRegex = \sprintf(self::REGEX, \implode('|', $allowedProtocols));
}
/**
* @param DocumentParsedEvent $e
*
* @return void
*/
public function __invoke(DocumentParsedEvent $e)
{
$walker = $e->getDocument()->walker();
while ($event = $walker->next()) {
$node = $event->getNode();
if ($node instanceof Text && !($node->parent() instanceof Link)) {
self::processAutolinks($node, $this->finalRegex);
}
}
}
private static function processAutolinks(Text $node, string $regex): void
{
$contents = \preg_split($regex, $node->getContent(), -1, PREG_SPLIT_DELIM_CAPTURE);
if ($contents === false || \count($contents) === 1) {
return;
}
$leftovers = '';
foreach ($contents as $i => $content) {
// Even-indexed elements are things before/after the URLs
if ($i % 2 === 0) {
// Insert any left-over characters here as well
$text = $leftovers . $content;
if ($text !== '') {
$node->insertBefore(new Text($leftovers . $content));
}
$leftovers = '';
continue;
}
$leftovers = '';
// Does the URL end with punctuation that should be stripped?
if (\preg_match('/(.+)([?!.,:*_~]+)$/', $content, $matches)) {
// Add the punctuation later
$content = $matches[1];
$leftovers = $matches[2];
}
// Does the URL end with something that looks like an entity reference?
if (\preg_match('/(.+)(&[A-Za-z0-9]+;)$/', $content, $matches)) {
$content = $matches[1];
$leftovers = $matches[2] . $leftovers;
}
// Does the URL need its closing paren chopped off?
if (\substr($content, -1) === ')' && ($diff = self::diffParens($content)) > 0) {
$content = \substr($content, 0, -$diff);
$leftovers = str_repeat(')', $diff) . $leftovers;
}
self::addLink($node, $content);
}
$node->detach();
}
private static function addLink(Text $node, string $url): void
{
// Auto-prefix 'http://' onto 'www' URLs
if (\substr($url, 0, 4) === 'www.') {
$node->insertBefore(new Link('http://' . $url, $url));
return;
}
$node->insertBefore(new Link($url, $url));
}
/**
* @param string $content
*
* @return int
*/
private static function diffParens(string $content): int
{
// Scan the entire autolink for the total number of parentheses.
// If there is a greater number of closing parentheses than opening ones,
// we don’t consider ANY of the last characters as part of the autolink,
// in order to facilitate including an autolink inside a parenthesis.
\preg_match_all('/[()]/', $content, $matches);
$charCount = ['(' => 0, ')' => 0];
foreach ($matches[0] as $char) {
$charCount[$char]++;
}
return $charCount[')'] - $charCount['('];
}
}
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