Viewing file:  LinkParserHelper.php (3.92 KB) -rw-r--r--
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<?php
declare(strict_types=1);
/*
* This file is part of the league/commonmark package.
*
* (c) Colin O'Dell <colinodell@gmail.com>
*
* Original code based on the CommonMark JS reference parser (https://bitly.com/commonmark-js)
* - (c) John MacFarlane
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace League\CommonMark\Util;
use League\CommonMark\Parser\Cursor;
/**
* @psalm-immutable
*/
final class LinkParserHelper
{
/**
* Attempt to parse link destination
*
* @return string|null The string, or null if no match
*/
public static function parseLinkDestination(Cursor $cursor): ?string
{
if ($res = $cursor->match(RegexHelper::REGEX_LINK_DESTINATION_BRACES)) {
// Chop off surrounding <..>:
return UrlEncoder::unescapeAndEncode(
RegexHelper::unescape(\substr($res, 1, -1))
);
}
if ($cursor->getCurrentCharacter() === '<') {
return null;
}
$destination = self::manuallyParseLinkDestination($cursor);
if ($destination === null) {
return null;
}
return UrlEncoder::unescapeAndEncode(
RegexHelper::unescape($destination)
);
}
public static function parseLinkLabel(Cursor $cursor): int
{
$match = $cursor->match('/^\[(?:[^\\\\\[\]]|\\\\.){0,1000}\]/');
if ($match === null) {
return 0;
}
$length = \mb_strlen($match, 'UTF-8');
if ($length > 1001) {
return 0;
}
return $length;
}
public static function parsePartialLinkLabel(Cursor $cursor): ?string
{
return $cursor->match('/^(?:[^\\\\\[\]]+|\\\\.?)*/');
}
/**
* Attempt to parse link title (sans quotes)
*
* @return string|null The string, or null if no match
*/
public static function parseLinkTitle(Cursor $cursor): ?string
{
if ($title = $cursor->match('/' . RegexHelper::PARTIAL_LINK_TITLE . '/')) {
// Chop off quotes from title and unescape
return RegexHelper::unescape(\substr($title, 1, -1));
}
return null;
}
public static function parsePartialLinkTitle(Cursor $cursor, string $endDelimiter): ?string
{
$endDelimiter = \preg_quote($endDelimiter, '/');
$regex = \sprintf('/(%s|[^%s\x00])*(?:%s)?/', RegexHelper::PARTIAL_ESCAPED_CHAR, $endDelimiter, $endDelimiter);
if (($partialTitle = $cursor->match($regex)) === null) {
return null;
}
return RegexHelper::unescape($partialTitle);
}
private static function manuallyParseLinkDestination(Cursor $cursor): ?string
{
$oldPosition = $cursor->getPosition();
$oldState = $cursor->saveState();
$openParens = 0;
while (($c = $cursor->getCurrentCharacter()) !== null) {
if ($c === '\\' && ($peek = $cursor->peek()) !== null && RegexHelper::isEscapable($peek)) {
$cursor->advanceBy(2);
} elseif ($c === '(') {
$cursor->advanceBy(1);
$openParens++;
} elseif ($c === ')') {
if ($openParens < 1) {
break;
}
$cursor->advanceBy(1);
$openParens--;
} elseif (\preg_match(RegexHelper::REGEX_WHITESPACE_CHAR, $c)) {
break;
} else {
$cursor->advanceBy(1);
}
}
if ($openParens !== 0) {
return null;
}
if ($cursor->getPosition() === $oldPosition && (! isset($c) || $c !== ')')) {
return null;
}
$newPos = $cursor->getPosition();
$cursor->restoreState($oldState);
$cursor->advanceBy($newPos - $cursor->getPosition());
return $cursor->getPreviousText();
}
}
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