ua_parser

defmodule UAParser.Version do
  @moduledoc """
  A module representing user agent version struct and helper methods.
  """

  @type t :: %__MODULE__{}

  @doc """
  ## Examples

      iex> version = %UAParser.Version{major: "1", minor: "2", patch: "3", patch_minor: "4"}
      iex> to_string(version)
      "1.2.3.4"

      iex> version = %UAParser.Version{major: "1", minor: "2", patch: "3"}
      iex> to_string(version)
      "1.2.3"

      iex> version = %UAParser.Version{major: "1", minor: "2"}
      iex> to_string(version)
      "1.2"

      iex> version = %UAParser.Version{major: "1"}
      iex> to_string(version)
      "1"

  """
  defstruct [:major, :minor, :patch, :patch_minor]
end

defimpl String.Chars, for: UAParser.Version do
  def to_string(%{major: major, minor: minor, patch: patch, patch_minor: patch_minor}) do
    [major, minor, patch, patch_minor]
    |> Enum.reject(&is_nil/1)
    |> Enum.join(".")
  end
end