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<?php
/*
* This file is part of the league/commonmark package.
*
* (c) Colin O'Dell <colinodell@gmail.com>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace League\CommonMark\Extension\HeadingPermalink;
use League\CommonMark\Block\Element\Heading;
use League\CommonMark\Event\DocumentParsedEvent;
use League\CommonMark\Extension\HeadingPermalink\Slug\DefaultSlugGenerator;
use League\CommonMark\Extension\HeadingPermalink\Slug\SlugGeneratorInterface;
use League\CommonMark\Inline\Element\Code;
use League\CommonMark\Inline\Element\Text;
use League\CommonMark\Node\Node;
use League\CommonMark\Util\ConfigurationAwareInterface;
use League\CommonMark\Util\ConfigurationInterface;
/**
* Searches the Document for Heading elements and adds HeadingPermalinks to each one
*/
final class HeadingPermalinkProcessor implements ConfigurationAwareInterface
{
const INSERT_BEFORE = 'before';
const INSERT_AFTER = 'after';
/** @var SlugGeneratorInterface */
private $slugGenerator;
/** @var ConfigurationInterface */
private $config;
public function __construct(SlugGeneratorInterface $slugGenerator = null)
{
$this->slugGenerator = $slugGenerator ?? new DefaultSlugGenerator();
}
public function setConfiguration(ConfigurationInterface $configuration)
{
$this->config = $configuration;
}
public function __invoke(DocumentParsedEvent $e): void
{
$walker = $e->getDocument()->walker();
while ($event = $walker->next()) {
$node = $event->getNode();
if ($node instanceof Heading && $event->isEntering()) {
$this->addHeadingLink($node);
}
}
}
private function addHeadingLink(Heading $heading): void
{
$text = $this->getChildText($heading);
$slug = $this->slugGenerator->createSlug($text);
$headingLinkAnchor = new HeadingPermalink($slug);
switch ($this->config->get('heading_permalink/insert', 'before')) {
case self::INSERT_BEFORE:
$heading->prependChild($headingLinkAnchor);
return;
case self::INSERT_AFTER:
$heading->appendChild($headingLinkAnchor);
return;
default:
throw new \RuntimeException("Invalid configuration value for heading_permalink/insert; expected 'before' or 'after'");
}
}
private function getChildText(Node $node): string
{
$text = '';
$walker = $node->walker();
while ($event = $walker->next()) {
if ($event->isEntering() && (($child = $event->getNode()) instanceof Text || $child instanceof Code)) {
$text .= $child->getContent();
}
}
return $text;
}
}
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