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A pragmatic parser combinator library

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ergo lib ergo utils.ex
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lib/ergo/utils.ex 

defmodule Ergo.Utils do

  @doc """

  ## Examples



      iex> Ergo.Utils.char_to_string(?H)

      "H"



      iex> Ergo.Utils.char_to_string(?h)

      "h"



      iex> Ergo.Utils.char_to_string(?\\r)

      "\\r"



      iex> Ergo.Utils.char_to_string(?\\n)

      "\\n"



      iex> Ergo.Utils.char_to_string(?\\t)

      "\\t"

  """

  def char_to_string(c) when is_integer(c) do

    List.to_string([c])

  end



  @doc ~S"""

  If the string `str` is longer than `max` (default: 40) it is truncated to 37 chars and "..." is added to the end, otherwise it is returned unaltered.



  ## Examples



      iex> Ergo.Utils.ellipsize("frob")

      "frob"



      iex> Ergo.Utils.ellipsize("123456789012345678901234567890123456789012345678901")

      "1234567890123456789012345678901234567..."



      iex> Ergo.Utils.ellipsize("12345678901234567890", 10)

      "1234567..."



      iex> Ergo.Utils.ellipsize("12345", 4)

      "1..."

  """

  def ellipsize(str, max \\ 40) when is_binary(str) and max > 3 do

    if String.length(str) > max do

      String.slice(str, 0..(max-4)) <> "..."

    else

      str

    end

  end



end