migrate_spip-1.0.0/src/Plugin/SpipRichText/EmDashes.php

<?php

declare(strict_types=1);

namespace Drupal\migrate_spip\Plugin\SpipRichText;

use Drupal\Core\StringTranslation\TranslatableMarkup;
use Drupal\migrate_spip\Attribute\SpipRichText;
use Drupal\migrate_spip\SpipRichTextBase;

/**
 * Manage SPIP em dashes.
 */
#[SpipRichText(
  id: 'em_dashes',
  label: new TranslatableMarkup('Em dashes'),
  weight: -20,
)]
final class EmDashes extends SpipRichTextBase {

  /**
   * {@inheritdoc}
   */
  public function apply(string $text): string {
    return preg_replace(
      '#\n-- *#',
      "\n<br />&mdash;&nbsp;",
      $text
    );
  }

}