| 148 |
lars |
1 |
<?php
|
|
|
2 |
|
|
|
3 |
declare(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 |
|
|
|
14 |
namespace League\CommonMark\Extension\CommonMark\Parser\Block;
|
|
|
15 |
|
|
|
16 |
use League\CommonMark\Parser\Block\BlockStart;
|
|
|
17 |
use League\CommonMark\Parser\Block\BlockStartParserInterface;
|
|
|
18 |
use League\CommonMark\Parser\Cursor;
|
|
|
19 |
use League\CommonMark\Parser\MarkdownParserStateInterface;
|
|
|
20 |
use League\CommonMark\Util\RegexHelper;
|
|
|
21 |
|
|
|
22 |
class HeadingStartParser implements BlockStartParserInterface
|
|
|
23 |
{
|
|
|
24 |
public function tryStart(Cursor $cursor, MarkdownParserStateInterface $parserState): ?BlockStart
|
|
|
25 |
{
|
|
|
26 |
if ($cursor->isIndented() || ! \in_array($cursor->getNextNonSpaceCharacter(), ['#', '-', '='], true)) {
|
|
|
27 |
return BlockStart::none();
|
|
|
28 |
}
|
|
|
29 |
|
|
|
30 |
$cursor->advanceToNextNonSpaceOrTab();
|
|
|
31 |
|
|
|
32 |
if ($atxHeading = self::getAtxHeader($cursor)) {
|
|
|
33 |
return BlockStart::of($atxHeading)->at($cursor);
|
|
|
34 |
}
|
|
|
35 |
|
|
|
36 |
$setextHeadingLevel = self::getSetextHeadingLevel($cursor);
|
|
|
37 |
if ($setextHeadingLevel > 0) {
|
|
|
38 |
$content = $parserState->getParagraphContent();
|
|
|
39 |
if ($content !== null) {
|
|
|
40 |
$cursor->advanceToEnd();
|
|
|
41 |
|
|
|
42 |
return BlockStart::of(new HeadingParser($setextHeadingLevel, $content))
|
|
|
43 |
->at($cursor)
|
|
|
44 |
->replaceActiveBlockParser();
|
|
|
45 |
}
|
|
|
46 |
}
|
|
|
47 |
|
|
|
48 |
return BlockStart::none();
|
|
|
49 |
}
|
|
|
50 |
|
|
|
51 |
private static function getAtxHeader(Cursor $cursor): ?HeadingParser
|
|
|
52 |
{
|
|
|
53 |
$match = RegexHelper::matchFirst('/^#{1,6}(?:[ \t]+|$)/', $cursor->getRemainder());
|
|
|
54 |
if (! $match) {
|
|
|
55 |
return null;
|
|
|
56 |
}
|
|
|
57 |
|
|
|
58 |
$cursor->advanceToNextNonSpaceOrTab();
|
|
|
59 |
$cursor->advanceBy(\strlen($match[0]));
|
|
|
60 |
|
|
|
61 |
$level = \strlen(\trim($match[0]));
|
|
|
62 |
$str = $cursor->getRemainder();
|
|
|
63 |
$str = \preg_replace('/^[ \t]*#+[ \t]*$/', '', $str);
|
|
|
64 |
\assert(\is_string($str));
|
|
|
65 |
$str = \preg_replace('/[ \t]+#+[ \t]*$/', '', $str);
|
|
|
66 |
\assert(\is_string($str));
|
|
|
67 |
|
|
|
68 |
return new HeadingParser($level, $str);
|
|
|
69 |
}
|
|
|
70 |
|
|
|
71 |
private static function getSetextHeadingLevel(Cursor $cursor): int
|
|
|
72 |
{
|
|
|
73 |
$match = RegexHelper::matchFirst('/^(?:=+|-+)[ \t]*$/', $cursor->getRemainder());
|
|
|
74 |
if ($match === null) {
|
|
|
75 |
return 0;
|
|
|
76 |
}
|
|
|
77 |
|
|
|
78 |
return $match[0][0] === '=' ? 1 : 2;
|
|
|
79 |
}
|
|
|
80 |
}
|