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Functional programming abstractions for Elixir (Beta release: APIs may change before 1.0)

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funx lib validator atom.ex
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lib/validator/atom.ex 

defmodule Funx.Validator.Atom do

  @moduledoc """

  Validates that a value is an atom.



  ## Optional Options



  - `:message` - Custom error message callback `(value -> String.t())`



  ## Examples



      iex> Funx.Validator.Atom.validate(:ok)

      %Funx.Monad.Either.Right{right: :ok}



      iex> Funx.Validator.Atom.validate(:error)

      %Funx.Monad.Either.Right{right: :error}



      iex> Funx.Validator.Atom.validate("atom")

      %Funx.Monad.Either.Left{left: %Funx.Errors.ValidationError{errors: ["must be an atom"]}}

  """



  use Funx.Validator



  alias Funx.Predicate



  @impl Funx.Validator

  def valid?(value, opts, _env) do

    predicate = Predicate.Atom.pred(opts)

    predicate.(value)

  end



  @impl Funx.Validator

  def default_message(_value, _opts) do

    "must be an atom"

  end

end