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