options.module

<?php


/**
 * @file
 */
use Drupal\Core\Entity\FieldableEntityInterface;
use Drupal\Core\Field\FieldStorageDefinitionInterface;

/**
 * Returns the array of allowed values for a list field.
 *
 * The strings are not safe for output. Keys and values of the array should be
 * sanitized through \Drupal\Core\Field\FieldFilteredMarkup before being
 * displayed.
 *
 * @param \Drupal\Core\Field\FieldStorageDefinitionInterface $definition
 *   The field storage definition.
 * @param \Drupal\Core\Entity\FieldableEntityInterface|null $entity
 *   (optional) The specific entity when this function is called from the
 *   context of a specific field on a specific entity. This allows custom
 *   'allowed_values_function' callbacks to either restrict the values or
 *   customize the labels for particular bundles and entities. NULL when
 *   there is not a specific entity available, such as for Views filters.
 *
 * @return array
 *   The array of allowed values. Keys of the array are the raw stored values
 *   (number or text), values of the array are the display labels.
 *
 * @see callback_allowed_values_function()
 */
function options_allowed_values(FieldStorageDefinitionInterface $definition, ?FieldableEntityInterface $entity = NULL) {
    $allowed_values =& drupal_static(__FUNCTION__, []);
    $cache_keys = [
        $definition->getTargetEntityTypeId(),
        $definition->getName(),
    ];
    if ($entity) {
        $cache_keys[] = 'entity';
    }
    $cache_id = implode(':', $cache_keys);
    if (!isset($allowed_values[$cache_id])) {
        $function = $definition->getSetting('allowed_values_function');
        // If $cacheable is FALSE, then the allowed values are not statically
        // cached. See options_test_dynamic_values_callback() for an example of
        // generating dynamic and uncached values.
        $cacheable = TRUE;
        if (!empty($function)) {
            $values = $function($definition, $entity, $cacheable);
        }
        else {
            $values = $definition->getSetting('allowed_values');
        }
        if ($cacheable) {
            $allowed_values[$cache_id] = $values;
        }
        else {
            return $values;
        }
    }
    return $allowed_values[$cache_id];
}

/**
 * Checks if a list of values are being used in actual field values.
 */
function _options_values_in_use($entity_type, $field_name, $values) {
    if ($values) {
        $result = \Drupal::entityQuery($entity_type)->condition($field_name . '.value', $values, 'IN')
            ->count()
            ->accessCheck(FALSE)
            ->range(0, 1)
            ->execute();
        if ($result) {
            return TRUE;
        }
    }
    return FALSE;
}