1<?php
2
3/*
4 * This file is part of the league/commonmark package.
5 *
6 * (c) Colin O'Dell <colinodell@gmail.com>
7 *
8 * Original code based on the CommonMark JS reference parser (https://bitly.com/commonmark-js)
9 *  - (c) John MacFarlane
10 *
11 * For the full copyright and license information, please view the LICENSE
12 * file that was distributed with this source code.
13 */
14
15namespace League\CommonMark\Block\Parser;
16
17use League\CommonMark\Block\Element\Heading;
18use League\CommonMark\ContextInterface;
19use League\CommonMark\Cursor;
20use League\CommonMark\Util\RegexHelper;
21
22final class ATXHeadingParser implements BlockParserInterface
23{
24    public function parse(ContextInterface $context, Cursor $cursor): bool
25    {
26        if ($cursor->isIndented()) {
27            return false;
28        }
29
30        $match = RegexHelper::matchFirst('/^#{1,6}(?:[ \t]+|$)/', $cursor->getLine(), $cursor->getNextNonSpacePosition());
31        if (!$match) {
32            return false;
33        }
34
35        $cursor->advanceToNextNonSpaceOrTab();
36
37        $cursor->advanceBy(\strlen($match[0]));
38
39        $level = \strlen(\trim($match[0]));
40        $str = $cursor->getRemainder();
41        /** @var string $str */
42        $str = \preg_replace('/^[ \t]*#+[ \t]*$/', '', $str);
43        /** @var string $str */
44        $str = \preg_replace('/[ \t]+#+[ \t]*$/', '', $str);
45
46        $context->addBlock(new Heading($level, $str));
47        $context->setBlocksParsed(true);
48
49        return true;
50    }
51}
52