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<?php |
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declare(strict_types=1); |
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/* |
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* This file is part of the league/commonmark package. |
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* |
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* (c) Colin O'Dell <[email protected]> |
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* |
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* For the full copyright and license information, please view the LICENSE |
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* file that was distributed with this source code. |
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*/ |
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namespace League\CommonMark\Extension\Autolink; |
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use League\CommonMark\Extension\CommonMark\Node\Inline\Link; |
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use League\CommonMark\Parser\Inline\InlineParserInterface; |
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use League\CommonMark\Parser\Inline\InlineParserMatch; |
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use League\CommonMark\Parser\InlineParserContext; |
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final class UrlAutolinkParser implements InlineParserInterface |
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{ |
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private const ALLOWED_AFTER = [null, ' ', "\t", "\n", "\x0b", "\x0c", "\x0d", '*', '_', '~', '(']; |
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// RegEx adapted from https://github.com/symfony/symfony/blob/4.2/src/Symfony/Component/Validator/Constraints/UrlValidator.php |
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private const REGEX = '~ |
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( |
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# Must start with a supported scheme + auth, or "www" |
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(?: |
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(?:%s):// # protocol |
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(?:([\.\pL\pN-]+:)?([\.\pL\pN-]+)@)? # basic auth |
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|www\.) |
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(?: |
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(?:[\pL\pN\pS\-\.])+(?:\.?(?:[\pL\pN]|xn\-\-[\pL\pN-]+)+\.?) # a domain name |
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| # or |
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\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3} # an IP address |
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| # or |
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\[ |
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(?:(?:(?:(?:(?:(?:(?:[0-9a-f]{1,4})):){6})(?:(?:(?:(?:(?:[0-9a-f]{1,4})):(?:(?:[0-9a-f]{1,4})))|(?:(?:(?:(?:(?:25[0-5]|(?:[1-9]|1[0-9]|2[0-4])?[0-9]))\.){3}(?:(?:25[0-5]|(?:[1-9]|1[0-9]|2[0-4])?[0-9])))))))|(?:(?:::(?:(?:(?:[0-9a-f]{1,4})):){5})(?:(?:(?:(?:(?:[0-9a-f]{1,4})):(?:(?:[0-9a-f]{1,4})))|(?:(?:(?:(?:(?:25[0-5]|(?:[1-9]|1[0-9]|2[0-4])?[0-9]))\.){3}(?:(?:25[0-5]|(?:[1-9]|1[0-9]|2[0-4])?[0-9])))))))|(?:(?:(?:(?:(?:[0-9a-f]{1,4})))?::(?:(?:(?:[0-9a-f]{1,4})):){4})(?:(?:(?:(?:(?:[0-9a-f]{1,4})):(?:(?:[0-9a-f]{1,4})))|(?:(?:(?:(?:(?:25[0-5]|(?:[1-9]|1[0-9]|2[0-4])?[0-9]))\.){3}(?:(?:25[0-5]|(?:[1-9]|1[0-9]|2[0-4])?[0-9])))))))|(?:(?:(?:(?:(?:(?:[0-9a-f]{1,4})):){0,1}(?:(?:[0-9a-f]{1,4})))?::(?:(?:(?:[0-9a-f]{1,4})):){3})(?:(?:(?:(?:(?:[0-9a-f]{1,4})):(?:(?:[0-9a-f]{1,4})))|(?:(?:(?:(?:(?:25[0-5]|(?:[1-9]|1[0-9]|2[0-4])?[0-9]))\.){3}(?:(?:25[0-5]|(?:[1-9]|1[0-9]|2[0-4])?[0-9])))))))|(?:(?:(?:(?:(?:(?:[0-9a-f]{1,4})):){0,2}(?:(?:[0-9a-f]{1,4})))?::(?:(?:(?:[0-9a-f]{1,4})):){2})(?:(?:(?:(?:(?:[0-9a-f]{1,4})):(?:(?:[0-9a-f]{1,4})))|(?:(?:(?:(?:(?:25[0-5]|(?:[1-9]|1[0-9]|2[0-4])?[0-9]))\.){3}(?:(?:25[0-5]|(?:[1-9]|1[0-9]|2[0-4])?[0-9])))))))|(?:(?:(?:(?:(?:(?:[0-9a-f]{1,4})):){0,3}(?:(?:[0-9a-f]{1,4})))?::(?:(?:[0-9a-f]{1,4})):)(?:(?:(?:(?:(?:[0-9a-f]{1,4})):(?:(?:[0-9a-f]{1,4})))|(?:(?:(?:(?:(?:25[0-5]|(?:[1-9]|1[0-9]|2[0-4])?[0-9]))\.){3}(?:(?:25[0-5]|(?:[1-9]|1[0-9]|2[0-4])?[0-9])))))))|(?:(?:(?:(?:(?:(?:[0-9a-f]{1,4})):){0,4}(?:(?:[0-9a-f]{1,4})))?::)(?:(?:(?:(?:(?:[0-9a-f]{1,4})):(?:(?:[0-9a-f]{1,4})))|(?:(?:(?:(?:(?:25[0-5]|(?:[1-9]|1[0-9]|2[0-4])?[0-9]))\.){3}(?:(?:25[0-5]|(?:[1-9]|1[0-9]|2[0-4])?[0-9])))))))|(?:(?:(?:(?:(?:(?:[0-9a-f]{1,4})):){0,5}(?:(?:[0-9a-f]{1,4})))?::)(?:(?:[0-9a-f]{1,4})))|(?:(?:(?:(?:(?:(?:[0-9a-f]{1,4})):){0,6}(?:(?:[0-9a-f]{1,4})))?::)))) |
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\] # an IPv6 address |
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) |
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(?::[0-9]+)? # a port (optional) |
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(?:/ (?:[\pL\pN\-._\~!$&\'()*+,;=:@]|%%[0-9A-Fa-f]{2})* )* # a path |
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(?:\? (?:[\pL\pN\-._\~!$&\'()*+,;=:@/?]|%%[0-9A-Fa-f]{2})* )? # a query (optional) |
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(?:\# (?:[\pL\pN\-._\~!$&\'()*+,;=:@/?]|%%[0-9A-Fa-f]{2})* )? # a fragment (optional) |
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)~ixu'; |
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/** |
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* @var string[] |
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* |
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* @psalm-readonly |
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*/ |
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private array $prefixes = ['www']; |
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/** @psalm-readonly */ |
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private string $finalRegex; |
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/** |
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* @param array<int, string> $allowedProtocols |
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*/ |
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public function __construct(array $allowedProtocols = ['http', 'https', 'ftp']) |
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{ |
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$this->finalRegex = \sprintf(self::REGEX, \implode('|', $allowedProtocols)); |
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foreach ($allowedProtocols as $protocol) { |
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$this->prefixes[] = $protocol . '://'; |
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} |
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} |
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public function getMatchDefinition(): InlineParserMatch |
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{ |
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return InlineParserMatch::oneOf(...$this->prefixes); |
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} |
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public function parse(InlineParserContext $inlineContext): bool |
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{ |
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$cursor = $inlineContext->getCursor(); |
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// Autolinks can only come at the beginning of a line, after whitespace, or certain delimiting characters |
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$previousChar = $cursor->peek(-1); |
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if (! \in_array($previousChar, self::ALLOWED_AFTER, true)) { |
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return false; |
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} |
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// Check if we have a valid URL |
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if (! \preg_match($this->finalRegex, $cursor->getRemainder(), $matches)) { |
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return false; |
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} |
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$url = $matches[0]; |
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// Does the URL end with punctuation that should be stripped? |
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if (\preg_match('/(.+)([?!.,:*_~]+)$/', $url, $matches)) { |
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// Add the punctuation later |
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$url = $matches[1]; |
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} |
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// Does the URL end with something that looks like an entity reference? |
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if (\preg_match('/(.+)(&[A-Za-z0-9]+;)$/', $url, $matches)) { |
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$url = $matches[1]; |
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} |
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// Does the URL need unmatched parens chopped off? |
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if (\substr($url, -1) === ')' && ($diff = self::diffParens($url)) > 0) { |
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$url = \substr($url, 0, -$diff); |
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} |
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$cursor->advanceBy(\mb_strlen($url)); |
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// Auto-prefix 'http://' onto 'www' URLs |
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if (\substr($url, 0, 4) === 'www.') { |
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$inlineContext->getContainer()->appendChild(new Link('http://' . $url, $url)); |
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return true; |
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} |
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$inlineContext->getContainer()->appendChild(new Link($url, $url)); |
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return true; |
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} |
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/** |
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* @psalm-pure |
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*/ |
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private static function diffParens(string $content): int |
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{ |
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// Scan the entire autolink for the total number of parentheses. |
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// If there is a greater number of closing parentheses than opening ones, |
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// we don’t consider ANY of the last characters as part of the autolink, |
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// in order to facilitate including an autolink inside a parenthesis. |
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\preg_match_all('/[()]/', $content, $matches); |
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$charCount = ['(' => 0, ')' => 0]; |
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foreach ($matches[0] as $char) { |
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$charCount[$char]++; |
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} |
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return $charCount[')'] - $charCount['(']; |
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} |
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} |
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thephpleague /
commonmark
