migrate_spip-1.0.0/src/Plugin/SpipRichText/EmptyLines.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;

/**
 * Replace empty lines.
 */
#[SpipRichText(
  id: 'empty_lines',
  label: new TranslatableMarkup('Empty lines'),
  weight: -40,
)]
final class EmptyLines extends SpipRichTextBase {

  /**
   * {@inheritdoc}
   */
  public function apply(string $text): string {
    return preg_replace(
      '#^[ \t]+$#m',
      '',
      $text
    );
  }

}