1<?php
2
3declare(strict_types=1);
4
5/*
6 * This file is part of the league/commonmark package.
7 *
8 * (c) Colin O'Dell <colinodell@gmail.com>
9 *
10 * For the full copyright and license information, please view the LICENSE
11 * file that was distributed with this source code.
12 */
13
14namespace League\CommonMark\Extension\TableOfContents;
15
16use League\CommonMark\Extension\TableOfContents\Node\TableOfContentsPlaceholder;
17use League\CommonMark\Parser\Block\AbstractBlockContinueParser;
18use League\CommonMark\Parser\Block\BlockContinue;
19use League\CommonMark\Parser\Block\BlockContinueParserInterface;
20use League\CommonMark\Parser\Block\BlockStart;
21use League\CommonMark\Parser\Block\BlockStartParserInterface;
22use League\CommonMark\Parser\Cursor;
23use League\CommonMark\Parser\MarkdownParserStateInterface;
24use League\Config\ConfigurationAwareInterface;
25use League\Config\ConfigurationInterface;
26
27final class TableOfContentsPlaceholderParser extends AbstractBlockContinueParser
28{
29    /** @psalm-readonly */
30    private TableOfContentsPlaceholder $block;
31
32    public function __construct()
33    {
34        $this->block = new TableOfContentsPlaceholder();
35    }
36
37    public function getBlock(): TableOfContentsPlaceholder
38    {
39        return $this->block;
40    }
41
42    public function tryContinue(Cursor $cursor, BlockContinueParserInterface $activeBlockParser): ?BlockContinue
43    {
44        return BlockContinue::none();
45    }
46
47    public static function blockStartParser(): BlockStartParserInterface
48    {
49        return new class () implements BlockStartParserInterface, ConfigurationAwareInterface {
50            /** @psalm-readonly-allow-private-mutation */
51            private ConfigurationInterface $config;
52
53            public function tryStart(Cursor $cursor, MarkdownParserStateInterface $parserState): ?BlockStart
54            {
55                $placeholder = $this->config->get('table_of_contents/placeholder');
56                if ($placeholder === null) {
57                    return BlockStart::none();
58                }
59
60                // The placeholder must be the only thing on the line
61                if ($cursor->match('/^' . \preg_quote($placeholder, '/') . '$/') === null) {
62                    return BlockStart::none();
63                }
64
65                return BlockStart::of(new TableOfContentsPlaceholderParser())->at($cursor);
66            }
67
68            public function setConfiguration(ConfigurationInterface $configuration): void
69            {
70                $this->config = $configuration;
71            }
72        };
73    }
74}
75