@spec validate(
  String.t(),
  keyword()
) :: {:ok, String.t()} | {:error, String.t()}

Validates display text.

Options

• :encoding - Character encoding :utf8 or :cp1251 (default: :utf8)

Rules

• Maximum 140 characters
• Must be valid in specified encoding

Examples

iex> QRNBU.Validators.Display.validate("Оплата послуг", encoding: :utf8)
{:ok, "Оплата послуг"}

iex> QRNBU.Validators.Display.validate("")
{:error, "Display text cannot be empty"}

iex> QRNBU.Validators.Display.validate(String.duplicate("A", 141))
{:error, "Display text must not exceed 140 characters"}