{function input_name id=''}{strip}

    {$_id = $id}
    {$_namespace = $namespace|default:''}

    {if $_namespace}
        {$_id = $_namespace|cat:'|':$_id}
    {/if}

    {$_first = true}
    {foreach explode('|', $_id) as $_id_part}
        {if !$_first}
            {$_id_part = '['|cat:$_id_part:']'}
        {/if}
        {$_first = false}
        {$_id_parts[] = $_id_part}
    {/foreach}

    {$_id = join('', $_id_parts)}

    {$_id}
{/strip}{/function}