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<?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\HeadingPermalink;
use League\CommonMark\Environment\EnvironmentAwareInterface;
use League\CommonMark\Environment\EnvironmentInterface;
use League\CommonMark\Event\DocumentParsedEvent;
use League\CommonMark\Extension\CommonMark\Node\Block\Heading;
use League\CommonMark\Node\NodeIterator;
use League\CommonMark\Node\RawMarkupContainerInterface;
use League\CommonMark\Node\StringContainerHelper;
use League\CommonMark\Normalizer\TextNormalizerInterface;
use League\Config\ConfigurationInterface;
/**
* Searches the Document for Heading elements and adds HeadingPermalinks to each one
*/
final class HeadingPermalinkProcessor implements EnvironmentAwareInterface
{
public const INSERT_BEFORE = 'before';
public const INSERT_AFTER = 'after';
/** @psalm-readonly-allow-private-mutation */
private TextNormalizerInterface $slugNormalizer;
/** @psalm-readonly-allow-private-mutation */
private ConfigurationInterface $config;
public function setEnvironment(EnvironmentInterface $environment): void
{
$this->config = $environment->getConfiguration();
$this->slugNormalizer = $environment->getSlugNormalizer();
}
public function __invoke(DocumentParsedEvent $e): void
{
$min = (int) $this->config->get('heading_permalink/min_heading_level');
$max = (int) $this->config->get('heading_permalink/max_heading_level');
$slugLength = (int) $this->config->get('slug_normalizer/max_length');
foreach ($e->getDocument()->iterator(NodeIterator::FLAG_BLOCKS_ONLY) as $node) {
if ($node instanceof Heading && $node->getLevel() >= $min && $node->getLevel() <= $max) {
$this->addHeadingLink($node, $slugLength);
}
}
}
private function addHeadingLink(Heading $heading, int $slugLength): void
{
$text = StringContainerHelper::getChildText($heading, [RawMarkupContainerInterface::class]);
$slug = $this->slugNormalizer->normalize($text, [
'node' => $heading,
'length' => $slugLength,
]);
$headingLinkAnchor = new HeadingPermalink($slug);
switch ($this->config->get('heading_permalink/insert')) {
case self::INSERT_BEFORE:
$heading->prependChild($headingLinkAnchor);
return;
case self::INSERT_AFTER:
$heading->appendChild($headingLinkAnchor);
return;
default:
throw new \RuntimeException("Invalid configuration value for heading_permalink/insert; expected 'before' or 'after'");
}
}
}
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