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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();
// We must be at the end of the line; otherwise, this link was not by itself
if (! $cursor->isAtEnd()) {
return BlockStart::none();
}
return BlockStart::of(new EmbedParser($dest))->at($cursor);
}
}