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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 <colinodell@gmail.com>
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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\Embed;
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use League\CommonMark\Parser\Block\BlockStart;
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use League\CommonMark\Parser\Block\BlockStartParserInterface;
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use League\CommonMark\Parser\Cursor;
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use League\CommonMark\Parser\MarkdownParserStateInterface;
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use League\CommonMark\Util\LinkParserHelper;
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class EmbedStartParser implements BlockStartParserInterface
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{
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public function tryStart(Cursor $cursor, MarkdownParserStateInterface $parserState): ?BlockStart
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{
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if ($cursor->isIndented() || $parserState->getParagraphContent() !== null || ! ($parserState->getActiveBlockParser()->isContainer())) {
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return BlockStart::none();
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}
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// 0-3 leading spaces are okay
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$cursor->advanceToNextNonSpaceOrTab();
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// The line must begin with "https://"
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if (! str_starts_with($cursor->getRemainder(), 'https://')) {
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return BlockStart::none();
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}
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// A valid link must be found next
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if (($dest = LinkParserHelper::parseLinkDestination($cursor)) === null) {
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return BlockStart::none();
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}
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// Skip any trailing whitespace
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$cursor->advanceToNextNonSpaceOrTab();
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// We must be at the end of the line; otherwise, this link was not by itself
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if (! $cursor->isAtEnd()) {
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return BlockStart::none();
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}
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return BlockStart::of(new EmbedParser($dest))->at($cursor);
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}
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}
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