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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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* (c) Rezo Zero / Ambroise Maupate |
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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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declare(strict_types=1); |
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namespace League\CommonMark\Extension\Footnote\Event; |
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use League\CommonMark\Event\DocumentParsedEvent; |
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use League\CommonMark\Extension\Footnote\Node\Footnote; |
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use League\CommonMark\Extension\Footnote\Node\FootnoteBackref; |
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use League\CommonMark\Extension\Footnote\Node\FootnoteContainer; |
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use League\CommonMark\Node\Block\Document; |
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use League\CommonMark\Reference\Reference; |
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final class GatherFootnotesListener |
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{ |
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public function onDocumentParsed(DocumentParsedEvent $event): void |
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{ |
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$document = $event->getDocument(); |
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$walker = $document->walker(); |
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$footnotes = []; |
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while ($event = $walker->next()) { |
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if (! $event->isEntering()) { |
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continue; |
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} |
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$node = $event->getNode(); |
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if (! $node instanceof Footnote) { |
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continue; |
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} |
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// Look for existing reference with footnote label |
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$ref = $document->getReferenceMap()->get($node->getReference()->getLabel()); |
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if ($ref !== null) { |
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// Use numeric title to get footnotes order |
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$footnotes[\intval($ref->getTitle())] = $node; |
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} else { |
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// Footnote call is missing, append footnote at the end |
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$footnotes[\PHP_INT_MAX] = $node; |
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} |
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$backrefs = $document->getData('#fn:' . $node->getReference()->getDestination(), []); |
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$this->createBackrefs($node, $backrefs); |
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} |
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// Only add a footnote container if there are any |
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if (\count($footnotes) === 0) { |
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return; |
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} |
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$container = $this->getFootnotesContainer($document); |
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\ksort($footnotes); |
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foreach ($footnotes as $footnote) { |
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$container->appendChild($footnote); |
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} |
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} |
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private function getFootnotesContainer(Document $document): FootnoteContainer |
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{ |
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$footnoteContainer = new FootnoteContainer(); |
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$document->appendChild($footnoteContainer); |
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return $footnoteContainer; |
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} |
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/** |
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* Look for all footnote refs pointing to this footnote and create each footnote backrefs. |
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* |
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* @param Footnote $node The target footnote |
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* @param Reference[] $backrefs References to create backrefs for |
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*/ |
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private function createBackrefs(Footnote $node, array $backrefs): void |
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{ |
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// Backrefs should be added to the child paragraph |
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$target = $node->lastChild(); |
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if ($target === null) { |
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// This should never happen, but you never know |
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$target = $node; |
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} |
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foreach ($backrefs as $backref) { |
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$target->appendChild(new FootnoteBackref(new Reference( |
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$backref->getLabel(), |
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'#fnref:' . $backref->getLabel(), |
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$backref->getTitle() |
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))); |
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} |
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} |
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} |
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thephpleague /
commonmark
