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📄 HeadingPermalink.php(742 B)
📄 HeadingPermalinkExtension.php(2.08 KB)
📄 HeadingPermalinkProcessor.php(3.73 KB)
📄 HeadingPermalinkRenderer.php(2.97 KB)

Editing: HeadingPermalinkProcessor.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\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;
use League\Config\Exception\InvalidConfigurationException;

/**
 * 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';
    public const INSERT_NONE   = 'none';

/** @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');
        $applyToHeading = (bool) $this->config->get('heading_permalink/apply_id_to_heading');
        $idPrefix       = (string) $this->config->get('heading_permalink/id_prefix');
        $slugLength     = (int) $this->config->get('slug_normalizer/max_length');
        $headingClass   = (string) $this->config->get('heading_permalink/heading_class');

if ($idPrefix !== '') {
            $idPrefix .= '-';
        }

foreach ($e->getDocument()->iterator(NodeIterator::FLAG_BLOCKS_ONLY) as $node) {
            if ($node instanceof Heading && $node->getLevel() >= $min && $node->getLevel() <= $max) {
                $this->addHeadingLink($node, $slugLength, $idPrefix, $applyToHeading, $headingClass);
            }
        }
    }

private function addHeadingLink(Heading $heading, int $slugLength, string $idPrefix, bool $applyToHeading, string $headingClass): void
    {
        $text = StringContainerHelper::getChildText($heading, [RawMarkupContainerInterface::class]);
        $slug = $this->slugNormalizer->normalize($text, [
            'node' => $heading,
            'length' => $slugLength,
        ]);

if ($applyToHeading) {
            $heading->data->set('attributes/id', $idPrefix . $slug);
        }

if ($headingClass !== '') {
            $heading->data->append('attributes/class', $headingClass);
        }

$headingLinkAnchor = new HeadingPermalink($slug);

switch ($this->config->get('heading_permalink/insert')) {
            case self::INSERT_BEFORE:
                $heading->prependChild($headingLinkAnchor);

return;
            case self::INSERT_AFTER:
                $heading->appendChild($headingLinkAnchor);

return;
            case self::INSERT_NONE:
                return;
            default:
                throw new InvalidConfigurationException("Invalid configuration value for heading_permalink/insert; expected 'before', 'after', or 'none'");
        }
    }
}

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