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<?php |
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declare(strict_types=1); |
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/* |
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* This file is part of the league/commonmark package. |
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* |
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* (c) Colin O'Dell <[email protected]> |
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* |
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* For the full copyright and license information, please view the LICENSE |
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* file that was distributed with this source code. |
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*/ |
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namespace League\CommonMark\Extension\HeadingPermalink; |
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use League\CommonMark\Environment\EnvironmentAwareInterface; |
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use League\CommonMark\Environment\EnvironmentInterface; |
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use League\CommonMark\Event\DocumentParsedEvent; |
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use League\CommonMark\Extension\CommonMark\Node\Block\Heading; |
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use League\CommonMark\Node\NodeIterator; |
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use League\CommonMark\Node\RawMarkupContainerInterface; |
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use League\CommonMark\Node\StringContainerHelper; |
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use League\CommonMark\Normalizer\TextNormalizerInterface; |
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use League\Config\ConfigurationInterface; |
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/** |
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* Searches the Document for Heading elements and adds HeadingPermalinks to each one |
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*/ |
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final class HeadingPermalinkProcessor implements EnvironmentAwareInterface |
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{ |
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public const INSERT_BEFORE = 'before'; |
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public const INSERT_AFTER = 'after'; |
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/** @psalm-readonly-allow-private-mutation */ |
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private TextNormalizerInterface $slugNormalizer; |
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/** @psalm-readonly-allow-private-mutation */ |
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private ConfigurationInterface $config; |
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public function setEnvironment(EnvironmentInterface $environment): void |
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{ |
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$this->config = $environment->getConfiguration(); |
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$this->slugNormalizer = $environment->getSlugNormalizer(); |
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} |
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public function __invoke(DocumentParsedEvent $e): void |
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{ |
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$min = (int) $this->config->get('heading_permalink/min_heading_level'); |
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$max = (int) $this->config->get('heading_permalink/max_heading_level'); |
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$slugLength = (int) $this->config->get('slug_normalizer/max_length'); |
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foreach ($e->getDocument()->iterator(NodeIterator::FLAG_BLOCKS_ONLY) as $node) { |
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if ($node instanceof Heading && $node->getLevel() >= $min && $node->getLevel() <= $max) { |
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$this->addHeadingLink($node, $slugLength); |
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} |
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} |
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} |
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private function addHeadingLink(Heading $heading, int $slugLength): void |
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{ |
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$text = StringContainerHelper::getChildText($heading, [RawMarkupContainerInterface::class]); |
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$slug = $this->slugNormalizer->normalize($text, [ |
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'node' => $heading, |
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'length' => $slugLength, |
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]); |
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$headingLinkAnchor = new HeadingPermalink($slug); |
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switch ($this->config->get('heading_permalink/insert')) { |
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case self::INSERT_BEFORE: |
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$heading->prependChild($headingLinkAnchor); |
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return; |
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case self::INSERT_AFTER: |
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$heading->appendChild($headingLinkAnchor); |
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return; |
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default: |
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throw new \RuntimeException("Invalid configuration value for heading_permalink/insert; expected 'before' or 'after'"); |
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} |
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} |
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} |
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thephpleague /
commonmark
