jacob

defmodule Jacob.Signature.Argument do
  import String, only: [trim: 1]
  alias Jacob.Errors.Signature.MalformedArgument
  @argument_regex ~r/^\s*([a-z0-9-]+)\s*(#\s*(.*))?\s*$/

  @moduledoc false

  defstruct [:name, :desc]

  @doc "Create a new argument from the given raw argument definition"
  def new(raw_argument) do
    raw_argument
    |> validate_argument!()
    |> create_argument()
  end

  defp validate_argument!(raw_argument) do
    if Regex.match?(@argument_regex, raw_argument) do
      raw_argument
    else
      raise MalformedArgument, raw_argument: raw_argument
    end
  end

  def create_argument(definition) when is_binary(definition) do
    case String.split(definition, "#", parts: 2) do
      [name, desc] -> %__MODULE__{name: trim(name), desc: trim(desc)}
      [name] -> %__MODULE__{name: trim(name)}
    end
  end
end