defmodule Gulib.String do
  
  def parse(value \\ nil), do: "#{value}"

  #### Begin blank? ######################
  def blank?(value) when is_list(value) do
    value == []
  end
  def blank?(value) when is_map(value) do
    value == %{}
  end
  def blank?(""), do: true
  def blank?(nil), do: true
  def blank?(value) when is_tuple(value) do
    value == {}
  end
  def blank?(value) when is_binary(value) or is_atom(value) do
    trim(value) == ""
  end
  def blank?(_), do: false

  #### Begin present? #####################
  def present?(value), do: not blank?(value)

  def trim(value) do
    value |> parse |> String.trim
  end

  def length(value, opts \\ []) do
    if opts[:trim] do
      value |> parse |> String.trim |> String.length
    else
      value |> parse |> String.length
    end
  end

end