EntityReferenceAutocomplete.php

<?php

/**
 * @file
 * Contains \Drupal\entity_reference/EntityReferenceAutocomplete.
 */
namespace Drupal\entity_reference;

use Drupal\Core\Entity\EntityManager;
use Symfony\Component\HttpKernel\Exception\AccessDeniedHttpException;

/**
 * Helper class to get autocompletion results for entity reference.
 */
class EntityReferenceAutocomplete {

  /**
   * The entity manager.
   *
   * @var \Drupal\Core\Entity\EntityManager
   */
  protected $entityManager;

  /**
   * Constructs a EntityReferenceAutocomplete object.
   *
   * @param \Drupal\Core\Entity\EntityManager $entity_manager
   *   The entity manager.
   */
  public function __construct(EntityManager $entity_manager) {
    $this->entityManager = $entity_manager;
  }

  /**
   * Returns matched labels based on a given field, instance and search string.
   *
   * This function can be used by other modules that wish to pass a mocked
   * definition of the field on instance.
   *
   * @param array $field
   *   The field array definition.
   * @param array $instance
   *   The instance array definition.
   * @param string $entity_type
   *   The entity type.
   * @param string $entity_id
   *   (optional) The entity ID the entity reference field is attached to.
   *   Defaults to ''.
   * @param string $prefix
   *   (optional) A prefix for all the keys returned by this function.
   * @param string $string
   *   (optional) The label of the entity to query by.
   *
   * @throws \Symfony\Component\HttpKernel\Exception\AccessDeniedHttpException
   *   Thrown when the current user doesn't have access to the specifies entity.
   *
   * @return array
   *   A list of matched entity labels.
   *
   * @see \Drupal\entity_reference\EntityReferenceController
   */
  public function getMatches($field, $instance, $entity_type, $entity_id = '', $prefix = '', $string = '') {
    $target_type = $field['settings']['target_type'];
    $matches = array();
    $entity = NULL;
    if ($entity_id !== 'NULL') {
      $entities = $this->entityManager
        ->getStorageController($entity_type)
        ->load(array(
        $entity_id,
      ));
      $entity = reset($entities);
      if (!$entity || !$entity
        ->access('view')) {
        throw new AccessDeniedHttpException();
      }
    }
    $handler = entity_reference_get_selection_handler($field, $instance, $entity);
    if (isset($string)) {

      // Get an array of matching entities.
      $widget = entity_get_form_display($instance['entity_type'], $instance['bundle'], 'default')
        ->getComponent($instance['field_name']);
      $match_operator = !empty($widget['settings']['match_operator']) ? $widget['settings']['match_operator'] : 'CONTAINS';
      $entity_labels = $handler
        ->getReferencableEntities($string, $match_operator, 10);

      // Loop through the entities and convert them into autocomplete output.
      foreach ($entity_labels as $values) {
        foreach ($values as $entity_id => $label) {
          $key = "{$label} ({$entity_id})";

          // Strip things like starting/trailing white spaces, line breaks and
          // tags.
          $key = preg_replace('/\\s\\s+/', ' ', str_replace("\n", '', trim(decode_entities(strip_tags($key)))));

          // Names containing commas or quotes must be wrapped in quotes.
          if (strpos($key, ',') !== FALSE || strpos($key, '"') !== FALSE) {
            $key = '"' . str_replace('"', '""', $key) . '"';
          }
          $matches[$prefix . $key] = $label;
        }
      }
    }
    return $matches;
  }

}