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This extension is based on https://github.com/rezozero/commonmark-ext-footnotes, imported and relicensed with permission from the maintainer: #474 (comment) In addition to importing the functionality, a number of configuration options were added, as well as some other small tweaks.
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,108 @@ | ||
| --- | ||
| layout: default | ||
| title: Footnote Extension | ||
| description: The FootnoteExtension adds the ability to create footnotes in Markdown documents. | ||
| --- | ||
|
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| # Footnotes | ||
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| The `FootnoteExtension` adds the ability to create footnotes in Markdown documents. | ||
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| ## Footnote Syntax | ||
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| Sample Markdown input: | ||
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| ```md | ||
| Duis mollis, est non commodo luctus, nisi erat porttitor ligula, eget lacinia odio sem nec elit. | ||
| Lorem ipsum dolor sit amet, consectetur adipiscing elit. Morbi[^note1] leo risus, porta ac consectetur ac. | ||
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| [^note1]: Elit Malesuada Ridiculus | ||
| ``` | ||
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| Result: | ||
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| ```md | ||
| <p> | ||
| Duis mollis, est non commodo luctus, nisi erat porttitor ligula, eget lacinia odio sem nec elit. | ||
| Lorem ipsum dolor sit amet, consectetur adipiscing elit. | ||
| Morbi<sup id="fnref:note1"><a class="footnote-ref" href="#fn:note1" role="doc-noteref">1</a></sup> leo risus, porta ac consectetur ac. | ||
| </p> | ||
| <div class="footnotes"> | ||
| <hr /> | ||
| <ol> | ||
| <li class="footnote" id="fn:note1"> | ||
| <p> | ||
| Elit Malesuada Ridiculus <a class="footnote-backref" rev="footnote" href="#fnref:note1">↩</a> | ||
| </p> | ||
| </li> | ||
| </ol> | ||
| </div> | ||
| ``` | ||
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| ## Usage | ||
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| Configure your `Environment` as usual and simply add the `FootnoteExtension`: | ||
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| ```php | ||
| <?php | ||
| use League\CommonMark\CommonMarkConverter; | ||
| use League\CommonMark\Environment; | ||
| use League\CommonMark\Extension\Footnote\FootnoteExtension; | ||
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| // Obtain a pre-configured Environment with all the CommonMark parsers/renderers ready-to-go | ||
| $environment = Environment::createCommonMarkEnvironment(); | ||
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| // Add the extension | ||
| $environment->addExtension(new FootnoteExtension()); | ||
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| // Set your configuration | ||
| $config = [ | ||
| // Extension defaults are shown below | ||
| // If you're happy with the defaults, feel free to remove them from this array | ||
| 'footnote' => [ | ||
| 'backref_class' => 'footnote-backref', | ||
| 'container_add_hr' => true, | ||
| 'container_class' => 'footnotes', | ||
| 'ref_class' => 'footnote-ref', | ||
| 'ref_id_prefix' => 'fnref:', | ||
| 'footnote_class' => 'footnote', | ||
| 'footnote_id_prefix' => 'fn:', | ||
| ], | ||
| ]; | ||
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| // Instantiate the converter engine and start converting some Markdown! | ||
| $converter = new CommonMarkConverter($config, $environment); | ||
| echo $converter->convertToHtml('# Hello World!'); | ||
| ``` | ||
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| ## Configuration | ||
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| This extension can be configured by providing a `footnote` array with several nested configuration options. The defaults are shown in the code example above. | ||
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| ### `backref_class` | ||
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| This `string` option defines which HTML class should be assigned to rendered footnote backreference elements. | ||
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| ### `container_add_hr` | ||
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| This `boolean` option controls whether an `<hr>` element should be added inside the container. Set this to `false` if you want more control over how the footnote section at the bottom is differentiated from the rest of the document. | ||
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| ### `container_class` | ||
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| This `string` option defines which HTML class should be assigned to the container at the bottom of the page which shows all the footnotes. | ||
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| ### `ref_class` | ||
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| This `string` option defines which HTML class should be assigned to rendered footnote reference elements. | ||
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| ### `ref_id_prefix` | ||
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| This `string` option defines the prefix prepended to footnote references. | ||
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| ### `footnote_class` | ||
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| This `string` option defines which HTML class should be assigned to rendered footnote elements. | ||
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| ### `footnote_id_prefix` | ||
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| This `string` option defines the prefix prepended to footnote elements. |
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51 changes: 51 additions & 0 deletions
51
src/Extension/Footnote/Event/AnonymousFootnotesListener.php
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| Original file line number | Diff line number | Diff line change |
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| <?php | ||
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| /* | ||
| * This file is part of the league/commonmark package. | ||
| * | ||
| * (c) Colin O'Dell <[email protected]> | ||
| * (c) Rezo Zero / Ambroise Maupate | ||
| * | ||
| * For the full copyright and license information, please view the LICENSE | ||
| * file that was distributed with this source code. | ||
| */ | ||
|
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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\Block\Element\Paragraph; | ||
| use League\CommonMark\Event\DocumentParsedEvent; | ||
| use League\CommonMark\Extension\Footnote\Node\Footnote; | ||
| use League\CommonMark\Extension\Footnote\Node\FootnoteBackref; | ||
| use League\CommonMark\Extension\Footnote\Node\FootnoteRef; | ||
| use League\CommonMark\Inline\Element\Text; | ||
| use League\CommonMark\Reference\Reference; | ||
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| final class AnonymousFootnotesListener | ||
| { | ||
| public function onDocumentParsed(DocumentParsedEvent $event): void | ||
| { | ||
| $document = $event->getDocument(); | ||
| $walker = $document->walker(); | ||
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| while ($event = $walker->next()) { | ||
| $node = $event->getNode(); | ||
| if ($node instanceof FootnoteRef && $event->isEntering() && null !== $text = $node->getContent()) { | ||
| // Anonymous footnote needs to create a footnote from its content | ||
| $existingReference = $node->getReference(); | ||
| $reference = new Reference( | ||
| $existingReference->getLabel(), | ||
| '#fnref:' . $existingReference->getLabel(), | ||
| $existingReference->getTitle() | ||
| ); | ||
| $footnote = new Footnote($reference); | ||
| $footnote->addBackref(new FootnoteBackref($reference)); | ||
| $paragraph = new Paragraph(); | ||
| $paragraph->appendChild(new Text($text)); | ||
| $footnote->appendChild($paragraph); | ||
| $document->appendChild($footnote); | ||
| } | ||
| } | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,87 @@ | ||
| <?php | ||
|
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| /* | ||
| * This file is part of the league/commonmark package. | ||
| * | ||
| * (c) Colin O'Dell <[email protected]> | ||
| * (c) Rezo Zero / Ambroise Maupate | ||
| * | ||
| * For the full copyright and license information, please view the LICENSE | ||
| * file that was distributed with this source code. | ||
| */ | ||
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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\Block\Element\Document; | ||
| use League\CommonMark\Event\DocumentParsedEvent; | ||
| use League\CommonMark\Extension\Footnote\Node\Footnote; | ||
| use League\CommonMark\Extension\Footnote\Node\FootnoteBackref; | ||
| use League\CommonMark\Extension\Footnote\Node\FootnoteContainer; | ||
| use League\CommonMark\Reference\Reference; | ||
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| final class GatherFootnotesListener | ||
| { | ||
| public function onDocumentParsed(DocumentParsedEvent $event): void | ||
| { | ||
| $document = $event->getDocument(); | ||
| $walker = $document->walker(); | ||
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| $footnotes = []; | ||
| while ($event = $walker->next()) { | ||
| if (!$event->isEntering()) { | ||
| continue; | ||
| } | ||
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| $node = $event->getNode(); | ||
| if (!$node instanceof Footnote) { | ||
| continue; | ||
| } | ||
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| // Look for existing reference with footnote label | ||
| $ref = $document->getReferenceMap()->getReference($node->getReference()->getLabel()); | ||
| if ($ref !== null) { | ||
| // Use numeric title to get footnotes order | ||
| $footnotes[\intval($ref->getTitle())] = $node; | ||
| } else { | ||
| // Footnote call is missing, append footnote at the end | ||
| $footnotes[INF] = $node; | ||
| } | ||
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| /* | ||
| * Look for all footnote refs pointing to this footnote | ||
| * and create each footnote backrefs. | ||
| */ | ||
| $backrefs = $document->getData('#fn:' . $node->getReference()->getDestination(), []); | ||
| /** @var Reference $backref */ | ||
| foreach ($backrefs as $backref) { | ||
| $node->addBackref(new FootnoteBackref(new Reference( | ||
| $backref->getLabel(), | ||
| '#fnref:' . $backref->getLabel(), | ||
| $backref->getTitle() | ||
| ))); | ||
| } | ||
| } | ||
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| // Only add a footnote container if there are any | ||
| if (\count($footnotes) === 0) { | ||
| return; | ||
| } | ||
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| $container = $this->getFootnotesContainer($document); | ||
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| \ksort($footnotes); | ||
| foreach ($footnotes as $footnote) { | ||
| $container->appendChild($footnote); | ||
| } | ||
| } | ||
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| private function getFootnotesContainer(Document $document): FootnoteContainer | ||
| { | ||
| $footnoteContainer = new FootnoteContainer(); | ||
| $document->appendChild($footnoteContainer); | ||
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| return $footnoteContainer; | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,86 @@ | ||
| <?php | ||
|
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| /* | ||
| * This file is part of the league/commonmark package. | ||
| * | ||
| * (c) Colin O'Dell <[email protected]> | ||
| * (c) Rezo Zero / Ambroise Maupate | ||
| * | ||
| * For the full copyright and license information, please view the LICENSE | ||
| * file that was distributed with this source code. | ||
| */ | ||
|
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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; | ||
| use League\CommonMark\Extension\Footnote\Node\FootnoteRef; | ||
| use League\CommonMark\Reference\Reference; | ||
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| final class NumberFootnotesListener | ||
| { | ||
| public function onDocumentParsed(DocumentParsedEvent $event): void | ||
| { | ||
| $document = $event->getDocument(); | ||
| $walker = $document->walker(); | ||
| $nextCounter = 1; | ||
| $usedLabels = []; | ||
| $usedCounters = []; | ||
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| while ($event = $walker->next()) { | ||
| if (!$event->isEntering()) { | ||
| continue; | ||
| } | ||
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| $node = $event->getNode(); | ||
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| if (!$node instanceof FootnoteRef) { | ||
| continue; | ||
| } | ||
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| $existingReference = $node->getReference(); | ||
| $label = $existingReference->getLabel(); | ||
| $counter = $nextCounter; | ||
| $canIncrementCounter = true; | ||
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| if (\array_key_exists($label, $usedLabels)) { | ||
| /* | ||
| * Reference is used again, we need to point | ||
| * to the same footnote. But with a different ID | ||
| */ | ||
| $counter = $usedCounters[$label]; | ||
| $label = $label . '__' . ++$usedLabels[$label]; | ||
| $canIncrementCounter = false; | ||
| } | ||
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| // rewrite reference title to use a numeric link | ||
| $newReference = new Reference( | ||
| $label, | ||
| $existingReference->getDestination(), | ||
| (string) $counter | ||
| ); | ||
|
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| // Override reference with numeric link | ||
| $node->setReference($newReference); | ||
| $document->getReferenceMap()->addReference($newReference); | ||
|
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| /* | ||
| * Store created references in document for | ||
| * creating FootnoteBackrefs | ||
| */ | ||
| if (false === $document->getData($existingReference->getDestination(), false)) { | ||
| $document->data[$existingReference->getDestination()] = []; | ||
| } | ||
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| $document->data[$existingReference->getDestination()][] = $newReference; | ||
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| $usedLabels[$label] = 1; | ||
| $usedCounters[$label] = $nextCounter; | ||
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| if ($canIncrementCounter) { | ||
| $nextCounter++; | ||
| } | ||
| } | ||
| } | ||
| } |
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