bookstack/app/Sorting/SortSetOperation.php

<?php

namespace BookStack\Sorting;

enum SortSetOperation: string
{
    case NameAsc = 'name_asc';
    case NameDesc = 'name_desc';
    case NameNumericAsc = 'name_numeric_asc';
    case CreatedDateAsc = 'created_date_asc';
    case CreatedDateDesc = 'created_date_desc';
    case UpdateDateAsc = 'updated_date_asc';
    case UpdateDateDesc = 'updated_date_desc';
    case ChaptersFirst = 'chapters_first';
    case ChaptersLast = 'chapters_last';

    /**
     * Provide a translated label string for this option.
     */
    public function getLabel(): string
    {
        $key = $this->value;
        $label = '';
        if (str_ends_with($key, '_asc')) {
            $key = substr($key, 0, -4);
            $label = trans('settings.sort_set_op_asc');
        } elseif (str_ends_with($key, '_desc')) {
            $key = substr($key, 0, -5);
            $label = trans('settings.sort_set_op_desc');
        }

        $label = trans('settings.sort_set_op_' . $key) . ' ' . $label;
        return trim($label);
    }

    /**
     * @return SortSetOperation[]
     */
    public static function allExcluding(array $operations): array
    {
        $all = SortSetOperation::cases();
        return array_diff($all, $operations);
    }
}