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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>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */
namespace League\CommonMark\Extension\Embed;
use League\CommonMark\Parser\Block\BlockStart;
use League\CommonMark\Parser\Block\BlockStartParserInterface;
use League\CommonMark\Parser\Cursor;
use League\CommonMark\Parser\MarkdownParserStateInterface;
use League\CommonMark\Util\LinkParserHelper;
class EmbedStartParser implements BlockStartParserInterface
{
    public function tryStart(Cursor $cursor, MarkdownParserStateInterface $parserState): ?BlockStart
    {
        if ($cursor->isIndented() || $parserState->getParagraphContent() !== null || ! ($parserState->getActiveBlockParser()->isContainer())) {
            return BlockStart::none();
        }
        // 0-3 leading spaces are okay
        $cursor->advanceToNextNonSpaceOrTab();
        // The line must begin with "https://"
        if (! str_starts_with($cursor->getRemainder(), 'https://')) {
            return BlockStart::none();
        }
        // A valid link must be found next
        if (($dest = LinkParserHelper::parseLinkDestination($cursor)) === null) {
            return BlockStart::none();
        }
        // Skip any trailing whitespace
        $cursor->advanceToNextNonSpaceOrTab();
 
 
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