81 lines
2.5 KiB
PHP
81 lines
2.5 KiB
PHP
<?php
|
|
|
|
declare(strict_types=1);
|
|
|
|
/*
|
|
* 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.
|
|
*/
|
|
|
|
namespace League\CommonMark\Extension\CommonMark\Parser\Block;
|
|
|
|
use League\CommonMark\Parser\Block\BlockStart;
|
|
use League\CommonMark\Parser\Block\BlockStartParserInterface;
|
|
use League\CommonMark\Parser\Cursor;
|
|
use League\CommonMark\Parser\MarkdownParserStateInterface;
|
|
use League\CommonMark\Util\RegexHelper;
|
|
|
|
class HeadingStartParser implements BlockStartParserInterface
|
|
{
|
|
public function tryStart(Cursor $cursor, MarkdownParserStateInterface $parserState): ?BlockStart
|
|
{
|
|
if ($cursor->isIndented() || ! \in_array($cursor->getNextNonSpaceCharacter(), ['#', '-', '='], true)) {
|
|
return BlockStart::none();
|
|
}
|
|
|
|
$cursor->advanceToNextNonSpaceOrTab();
|
|
|
|
if ($atxHeading = self::getAtxHeader($cursor)) {
|
|
return BlockStart::of($atxHeading)->at($cursor);
|
|
}
|
|
|
|
$setextHeadingLevel = self::getSetextHeadingLevel($cursor);
|
|
if ($setextHeadingLevel > 0) {
|
|
$content = $parserState->getParagraphContent();
|
|
if ($content !== null) {
|
|
$cursor->advanceToEnd();
|
|
|
|
return BlockStart::of(new HeadingParser($setextHeadingLevel, $content))
|
|
->at($cursor)
|
|
->replaceActiveBlockParser();
|
|
}
|
|
}
|
|
|
|
return BlockStart::none();
|
|
}
|
|
|
|
private static function getAtxHeader(Cursor $cursor): ?HeadingParser
|
|
{
|
|
$match = RegexHelper::matchFirst('/^#{1,6}(?:[ \t]+|$)/', $cursor->getRemainder());
|
|
if (! $match) {
|
|
return null;
|
|
}
|
|
|
|
$cursor->advanceToNextNonSpaceOrTab();
|
|
$cursor->advanceBy(\strlen($match[0]));
|
|
|
|
$level = \strlen(\trim($match[0]));
|
|
$str = $cursor->getRemainder();
|
|
$str = \preg_replace('/^[ \t]*#+[ \t]*$/', '', $str);
|
|
\assert(\is_string($str));
|
|
$str = \preg_replace('/[ \t]+#+[ \t]*$/', '', $str);
|
|
\assert(\is_string($str));
|
|
|
|
return new HeadingParser($level, $str);
|
|
}
|
|
|
|
private static function getSetextHeadingLevel(Cursor $cursor): int
|
|
{
|
|
$match = RegexHelper::matchFirst('/^(?:=+|-+)[ \t]*$/', $cursor->getRemainder());
|
|
if ($match === null) {
|
|
return 0;
|
|
}
|
|
|
|
return $match[0][0] === '=' ? 1 : 2;
|
|
}
|
|
}
|