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<?php
/*
* 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.
*/
declare(strict_types=1);
namespace League\CommonMark\Extension\DescriptionList\Parser;
use League\CommonMark\Extension\DescriptionList\Node\Description;
use League\CommonMark\Node\Block\Paragraph;
use League\CommonMark\Parser\Block\BlockStart;
use League\CommonMark\Parser\Block\BlockStartParserInterface;
use League\CommonMark\Parser\Cursor;
use League\CommonMark\Parser\MarkdownParserStateInterface;
final class DescriptionStartParser implements BlockStartParserInterface
{
public function tryStart(Cursor $cursor, MarkdownParserStateInterface $parserState): ?BlockStart
{
if ($cursor->isIndented()) {
return BlockStart::none();
}
$cursor->advanceToNextNonSpaceOrTab();
if ($cursor->match('/^:[ \t]+/') === null) {
return BlockStart::none();
}
$terms = $parserState->getParagraphContent();
$activeBlock = $parserState->getActiveBlockParser()->getBlock();
if ($terms !== null && $terms !== '') {
// New description; tight; term(s) sitting in pending block that we will replace
return BlockStart::of(...[new DescriptionListContinueParser()], ...self::splitTerms($terms), ...[new DescriptionContinueParser(true, $cursor->getPosition())])
->at($cursor)
->replaceActiveBlockParser();
}
if ($activeBlock instanceof Paragraph && $activeBlock->parent() instanceof Description) {
// Additional description in the same list as the parent description
return BlockStart::of(new DescriptionContinueParser(true, $cursor->getPosition()))->at($cursor);
}
if ($activeBlock->lastChild() instanceof Paragraph) {
// New description; loose; term(s) sitting in previous closed paragraph block
return BlockStart::of(new DescriptionContinueParser(false, $cursor->getPosition()))->at($cursor);
}
// No preceding terms
return BlockStart::none();
}
/**
* @return array<int, DescriptionTermContinueParser>
*/
private static function splitTerms(string $terms): array
{
$ret = [];
foreach (\explode("\n", $terms) as $term) {
$ret[] = new DescriptionTermContinueParser($term);
}
return $ret;
}
}
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