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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\TableOfContents; |
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use League\CommonMark\Configuration\ConfigurationAwareInterface; |
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use League\CommonMark\Configuration\ConfigurationInterface; |
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use League\CommonMark\Event\DocumentParsedEvent; |
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use League\CommonMark\Exception\InvalidOptionException; |
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use League\CommonMark\Extension\CommonMark\Node\Block\Heading; |
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use League\CommonMark\Extension\HeadingPermalink\HeadingPermalink; |
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use League\CommonMark\Extension\TableOfContents\Node\TableOfContents; |
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use League\CommonMark\Extension\TableOfContents\Node\TableOfContentsPlaceholder; |
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use League\CommonMark\Node\Block\Document; |
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final class TableOfContentsBuilder implements ConfigurationAwareInterface |
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{ |
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public const POSITION_TOP = 'top'; |
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public const POSITION_BEFORE_HEADINGS = 'before-headings'; |
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public const POSITION_PLACEHOLDER = 'placeholder'; |
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/** @var ConfigurationInterface */ |
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private $config; |
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public function onDocumentParsed(DocumentParsedEvent $event): void |
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{ |
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$document = $event->getDocument(); |
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$generator = new TableOfContentsGenerator( |
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$this->config->get('table_of_contents/style', TableOfContentsGenerator::STYLE_BULLET), |
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$this->config->get('table_of_contents/normalize', TableOfContentsGenerator::NORMALIZE_RELATIVE), |
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(int) $this->config->get('table_of_contents/min_heading_level', 1), |
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(int) $this->config->get('table_of_contents/max_heading_level', 6) |
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); |
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$toc = $generator->generate($document); |
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if ($toc === null) { |
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// No linkable headers exist, so no TOC could be generated |
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return; |
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} |
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// Add custom CSS class(es), if defined |
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$class = $this->config->get('table_of_contents/html_class', 'table-of-contents'); |
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if (!empty($class)) { |
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$toc->data['attributes']['class'] = $class; |
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} |
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// Add the TOC to the Document |
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$position = $this->config->get('table_of_contents/position', self::POSITION_TOP); |
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if ($position === self::POSITION_TOP) { |
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$document->prependChild($toc); |
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} elseif ($position === self::POSITION_BEFORE_HEADINGS) { |
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$this->insertBeforeFirstLinkedHeading($document, $toc); |
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} elseif ($position === self::POSITION_PLACEHOLDER) { |
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$this->replacePlaceholders($document, $toc); |
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} else { |
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throw new InvalidOptionException(\sprintf('Invalid config option "%s" for "table_of_contents/position"', $position)); |
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} |
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} |
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private function insertBeforeFirstLinkedHeading(Document $document, TableOfContents $toc): void |
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{ |
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$walker = $document->walker(); |
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while ($event = $walker->next()) { |
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if ($event->isEntering() && ($node = $event->getNode()) instanceof HeadingPermalink && ($parent = $node->parent()) instanceof Heading) { |
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$parent->insertBefore($toc); |
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return; |
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} |
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} |
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} |
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private function replacePlaceholders(Document $document, TableOfContents $toc): void |
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{ |
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$walker = $document->walker(); |
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while ($event = $walker->next()) { |
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// Add the block once we find a placeholder (and we're about to leave it) |
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if (!$event->getNode() instanceof TableOfContentsPlaceholder) { |
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continue; |
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} |
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if ($event->isEntering()) { |
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continue; |
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} |
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$event->getNode()->replaceWith(clone $toc); |
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} |
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} |
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public function setConfiguration(ConfigurationInterface $config): void |
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{ |
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$this->config = $config; |
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} |
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} |
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thephpleague /
commonmark
