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faker

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Faker is a pure Elixir library for generating fake data.

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faker lib faker.ex
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lib/faker.ex 

defmodule Faker do

  def format(str) when is_binary(str) do

    format(str, "")

  end



  defp format(<<"#" :: utf8, tail :: binary>>, "") do

    format(tail, "#{:crypto.rand_uniform(1, 10)}")

  end



  defp format(<<"#" :: utf8, tail :: binary>>, acc) do

    format(tail, <<acc :: binary, "#{:crypto.rand_uniform(0, 10)}">>)

  end



  defp format(<<"?" :: utf8, tail :: binary>>, acc) do

    format(tail, <<acc :: binary, letter>>)

  end



  defp format(<<other :: utf8, tail :: binary>>, acc) do

    format(tail, <<acc :: binary, other>>)

  end



  defp format("", acc) do

    acc

  end



  defp letter do

    alphabet = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz'

    Enum.at(alphabet, :crypto.rand_uniform(0, Enum.count(alphabet)))

  end



  def locale do

    Application.get_env(:faker, :locale)

  end



  def locale(lang) when is_atom(lang) do

    Application.put_env(:faker, :locale, lang)

  end

end