DataListContains.php

<?php

namespace Drupal\rules\Plugin\Condition;

use Drupal\rules\Core\RulesConditionBase;
use Drupal\Core\Entity\EntityInterface;

/**
 * Provides a 'List contains' condition.
 *
 * @todo Add access callback information from Drupal 7?
 * @todo Add group information from Drupal 7?
 * @todo Add info alter
 *
 * @Condition(
 *   id = "rules_list_contains",
 *   label = @Translation("List contains item"),
 *   category = @Translation("Data"),
 *   context_definitions = {
 *     "list" = @ContextDefinition("list",
 *       label = @Translation("List"),
 *       description = @Translation("The list to be checked."),
 *       assignment_restriction = "selector"
 *     ),
 *     "item" = @ContextDefinition("any",
 *       label = @Translation("Item"),
 *       description = @Translation("The item to check for.")
 *     ),
 *   }
 * )
 */
class DataListContains extends RulesConditionBase {
    
    /**
     * Evaluate whether the list has the item.
     *
     * @param array|\Drupal\Core\TypedData\ListInterface $list
     *   List to be searched.
     * @param mixed $item
     *   Item to be found in list.
     */
    protected function doEvaluate($list, $item) {
        if ($item instanceof EntityInterface && ($id = $item->id())) {
            // Check for equal items using the identifier if there is one.
            foreach ($list as $list_item) {
                if ($list_item->id() == $id) {
                    return TRUE;
                }
            }
            return FALSE;
        }
        return in_array($item, $list);
    }

}