search_api-8.x-1.15/src/Plugin/search_api/processor/Transliteration.php

<?php

namespace Drupal\search_api\Plugin\search_api\processor;

use Drupal\Component\Transliteration\TransliterationInterface;
use Drupal\Core\Language\LanguageManagerInterface;
use Drupal\search_api\Processor\FieldsProcessorPluginBase;
use Symfony\Component\DependencyInjection\ContainerInterface;

/**
 * Makes searches insensitive to accents and other non-ASCII characters.
 *
 * @SearchApiProcessor(
 *   id = "transliteration",
 *   label = @Translation("Transliteration"),
 *   description = @Translation("Makes searches insensitive to accents and other non-ASCII characters."),
 *   stages = {
 *     "pre_index_save" = 0,
 *     "preprocess_index" = -20,
 *     "preprocess_query" = -20
 *   }
 * )
 */
class Transliteration extends FieldsProcessorPluginBase {

  /**
   * The transliteration service to use.
   *
   * @var \Drupal\Component\Transliteration\TransliterationInterface
   */
  protected $transliterator;

  /**
   * The language manager.
   *
   * @var \Drupal\Core\Language\LanguageManagerInterface|null
   */
  protected $languageManager;

  /**
   * The language to use for transliterating.
   *
   * @var string
   */
  protected $langcode;

  /**
   * {@inheritdoc}
   */
  public static function create(ContainerInterface $container, array $configuration, $plugin_id, $plugin_definition) {
    /** @var static $processor */
    $processor = parent::create($container, $configuration, $plugin_id, $plugin_definition);

    $processor->setTransliterator($container->get('transliteration'));
    $processor->setLanguageManager($container->get('language_manager'));
    $langcode = $processor->getLanguageManager()->getDefaultLanguage()->getId();
    $processor->setLangcode($langcode);

    return $processor;
  }

  /**
   * Retrieves the transliterator.
   *
   * @return \Drupal\Component\Transliteration\TransliterationInterface
   *   The transliterator.
   */
  public function getTransliterator() {
    return $this->transliterator ?: \Drupal::service('transliteration');
  }

  /**
   * Sets the transliterator.
   *
   * @param \Drupal\Component\Transliteration\TransliterationInterface $transliterator
   *   The new transliterator.
   *
   * @return $this
   */
  public function setTransliterator(TransliterationInterface $transliterator) {
    $this->transliterator = $transliterator;
    return $this;
  }

  /**
   * Retrieves the language manager.
   *
   * @return \Drupal\Core\Language\LanguageManagerInterface
   *   The language manager.
   */
  public function getLanguageManager() {
    return $this->languageManager ?: \Drupal::languageManager();
  }

  /**
   * Sets the language manager.
   *
   * @param \Drupal\Core\Language\LanguageManagerInterface $language_manager
   *   The new language manager.
   *
   * @return $this
   */
  public function setLanguageManager(LanguageManagerInterface $language_manager) {
    $this->languageManager = $language_manager;
    return $this;
  }

  /**
   * Retrieves the langcode.
   *
   * @return string
   *   The langcode.
   */
  public function getLangcode() {
    return $this->langcode ?: $this->getLanguageManager()
      ->getDefaultLanguage()
      ->getId();
  }

  /**
   * Sets the langcode.
   *
   * @param string $langcode
   *   The new langcode.
   *
   * @return $this
   */
  public function setLangcode($langcode) {
    $this->langcode = $langcode;
    return $this;
  }

  /**
   * {@inheritdoc}
   */
  protected function process(&$value) {
    // We don't touch integers, NULL values or the like.
    if (is_string($value)) {
      $value = $this->getTransliterator()->transliterate($value, $this->getLangcode());
    }
  }

}