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Simple parameters validation library

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talos lib field.ex
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lib/field.ex 

defmodule Talos.Field do

  @moduledoc false

  # Belongs mostly to MapType, and used for key-value pairs



  @enforce_keys [:key, :type]

  defstruct [:key, :type, :description, :default_value, optional: false]



  @type t :: %{

          __struct__: atom,

          key: any,

          type: any,

          description: String.t(),

          default_value: any,

          optional: boolean

        }



  def valid?(%__MODULE__{optional: is_optional} = field, expected_map_value)

      when is_map(expected_map_value) do

    is_key_missed = !Map.has_key?(expected_map_value, field.key)



    if is_key_missed do

      is_optional

    else

      Talos.valid?(field.type, expected_map_value[field.key])

    end

  end



  def valid?(_field, _not_map_value) do

    false

  end



  def errors(%__MODULE__{optional: is_optional} = field, expected_map_value)

      when is_map(expected_map_value) do

    is_key_missed = !Map.has_key?(expected_map_value, field.key)



    cond do

      is_key_missed && !is_optional -> {field.key, ["should exist"]}

      is_key_missed && is_optional -> {field.key, []}

      true -> {field.key, Talos.errors(field.type, expected_map_value[field.key])}

    end

  end



  def errors(_field, _not_map_value) do

    false

  end

end