Viewing file:  SetExtHeadingParser.php (2.33 KB) -rw-r--r--
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<?php
/*
* This file is part of the league/commonmark package.
*
* (c) Colin O'Dell <colinodell@gmail.com>
*
* Original code based on the CommonMark JS reference parser (https://bitly.com/commonmark-js)
* - (c) John MacFarlane
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace League\CommonMark\Block\Parser;
use League\CommonMark\Block\Element\Heading;
use League\CommonMark\Block\Element\Paragraph;
use League\CommonMark\ContextInterface;
use League\CommonMark\Cursor;
use League\CommonMark\Reference\ReferenceParser;
use League\CommonMark\Util\RegexHelper;
final class SetExtHeadingParser implements BlockParserInterface
{
public function parse(ContextInterface $context, Cursor $cursor): bool
{
if ($cursor->isIndented()) {
return false;
}
if (!($context->getContainer() instanceof Paragraph)) {
return false;
}
$match = RegexHelper::matchFirst('/^(?:=+|-+)[ \t]*$/', $cursor->getLine(), $cursor->getNextNonSpacePosition());
if ($match === null) {
return false;
}
$level = $match[0][0] === '=' ? 1 : 2;
$strings = $context->getContainer()->getStrings();
$strings = $this->resolveReferenceLinkDefinitions($strings, $context->getReferenceParser());
if (empty($strings)) {
return false;
}
$context->replaceContainerBlock(new Heading($level, $strings));
return true;
}
/**
* Resolve reference link definition
*
* @see https://github.com/commonmark/commonmark.js/commit/993bbe335931af847460effa99b2411eb643577d
*
* @param string[] $strings
* @param ReferenceParser $referenceParser
*
* @return string[]
*/
private function resolveReferenceLinkDefinitions(array $strings, ReferenceParser $referenceParser): array
{
foreach ($strings as &$string) {
$cursor = new Cursor($string);
while ($cursor->getCharacter() === '[' && $referenceParser->parse($cursor)) {
$string = $cursor->getRemainder();
}
if ($string !== '') {
break;
}
}
return \array_filter($strings, function ($s) {
return $s !== '';
});
}
}
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