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commonmark
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EmbedStartParser.php
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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); } }