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<?php |
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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\Block\Element\Heading; |
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use League\CommonMark\Event\DocumentParsedEvent; |
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use League\CommonMark\Extension\HeadingPermalink\Slug\DefaultSlugGenerator; |
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use League\CommonMark\Extension\HeadingPermalink\Slug\SlugGeneratorInterface; |
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use League\CommonMark\Inline\Element\Text; |
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use League\CommonMark\Node\Node; |
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use League\CommonMark\Util\ConfigurationAwareInterface; |
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use League\CommonMark\Util\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 ConfigurationAwareInterface |
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{ |
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const INSERT_BEFORE = 'before'; |
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const INSERT_AFTER = 'after'; |
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/** @var SlugGeneratorInterface */ |
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private $slugGenerator; |
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/** @var ConfigurationInterface */ |
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private $config; |
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/** |
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* @param SlugGeneratorInterface|null $slugGenerator |
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*/ |
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public function __construct(SlugGeneratorInterface $slugGenerator = null) |
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{ |
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$this->slugGenerator = $slugGenerator ?? new DefaultSlugGenerator(); |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function setConfiguration(ConfigurationInterface $configuration) |
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{ |
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$this->config = $configuration; |
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} |
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/** |
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* @param DocumentParsedEvent $e |
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*/ |
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public function __invoke(DocumentParsedEvent $e) |
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{ |
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$walker = $e->getDocument()->walker(); |
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while ($event = $walker->next()) { |
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$node = $event->getNode(); |
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if ($node instanceof Heading && $event->isEntering()) { |
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$this->addHeadingLink($node); |
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} |
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} |
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} |
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private function addHeadingLink(Heading $heading) |
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{ |
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$text = $this->getChildText($heading); |
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$slug = $this->slugGenerator->createSlug($text); |
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$headingLinkAnchor = new HeadingPermalink($slug); |
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switch ($this->config->get('heading_permalink/insert', 'before')) { |
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case self::INSERT_BEFORE: |
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$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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private function getChildText(Node $node) |
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{ |
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$text = ''; |
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$walker = $node->walker(); |
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while ($event = $walker->next()) { |
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if ($event->isEntering() && ($child = $event->getNode()) instanceof Text) { |
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$text .= $child->getContent(); |
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} |
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} |
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return $text; |
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} |
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} |
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thephpleague /
commonmark
