listfieldassembler.php

См. документацию.

<?php
 
namespace Bitrix\Main\Grid\Row\Assembler\Field;
 
use Bitrix\Main\Grid\Row\FieldAssembler;

abstract class ListFieldAssembler extends FieldAssembler
{
    private array $names;

    abstract protected function getNames(): array;

    protected function getEmptyName(): ?string
    {
        return null;
    }
    protected function getEmptyName(): ?string {…}

    final protected function prepareColumn($value)
    {
        if (empty($value))
        {
            return $this->getEmptyName();
        }
 
        $this->names ??= $this->getNames();
 
        return $this->names[$value] ?? null;
    }
    final protected function prepareColumn($value) {…}
}
abstract class ListFieldAssembler extends FieldAssembler {…};