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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\TableOfContents; |
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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\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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use League\CommonMark\Node\NodeIterator; |
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use League\Config\ConfigurationAwareInterface; |
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use League\Config\ConfigurationInterface; |
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use League\Config\Exception\InvalidConfigurationException; |
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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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/** @psalm-readonly-allow-private-mutation */ |
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private ConfigurationInterface $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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(string) $this->config->get('table_of_contents/style'), |
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(string) $this->config->get('table_of_contents/normalize'), |
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(int) $this->config->get('table_of_contents/min_heading_level'), |
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(int) $this->config->get('table_of_contents/max_heading_level'), |
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(string) $this->config->get('heading_permalink/fragment_prefix'), |
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); |
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$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 = $this->config->get('table_of_contents/html_class'); |
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if ($class !== null) { |
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$toc->data->append('attributes/class', $class); |
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} |
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// Add the TOC to the Document |
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$position = $this->config->get('table_of_contents/position'); |
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if ($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 InvalidConfigurationException::forConfigOption('table_of_contents/position', $position); |
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} |
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} |
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private function insertBeforeFirstLinkedHeading(Document $document, TableOfContents $toc): void |
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{ |
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foreach ($document->iterator(NodeIterator::FLAG_BLOCKS_ONLY) as $node) { |
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if (! $node instanceof Heading) { |
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continue; |
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} |
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foreach ($node->children() as $child) { |
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if ($child instanceof HeadingPermalink) { |
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$node->insertBefore($toc); |
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return; |
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} |
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} |
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} |
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} |
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private function replacePlaceholders(Document $document, TableOfContents $toc): void |
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{ |
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foreach ($document->iterator(NodeIterator::FLAG_BLOCKS_ONLY) as $node) { |
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// Add the block once we find a placeholder |
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if (! $node instanceof TableOfContentsPlaceholder) { |
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continue; |
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} |
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$node->replaceWith(clone $toc); |
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} |
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} |
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public function setConfiguration(ConfigurationInterface $configuration): void |
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{ |
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$this->config = $configuration; |
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} |
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} |
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thephpleague /
commonmark
