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plug lib plug html.ex
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lib/plug/html.ex 

defmodule Plug.HTML do

  @moduledoc """

  Conveniences for generating HTML.

  """



  @doc ~S"""

  Escapes the given HTML.



      iex> Plug.HTML.html_escape("<foo>")

      "&lt;foo&gt;"



      iex> Plug.HTML.html_escape("quotes: \" & \'")

      "quotes: &quot; &amp; &#39;"

  """

  def html_escape(data) when is_binary(data) do

    IO.iodata_to_binary(for <<char <- data>>, do: escape_char(char))

  end



  @compile {:inline, escape_char: 1}



  @escapes [

    {?<, "&lt;"},

    {?>, "&gt;"},

    {?&, "&amp;"},

    {?", "&quot;"},

    {?', "&#39;"}

  ]



  Enum.each @escapes, fn { match, insert } ->

    defp escape_char(unquote(match)), do: unquote(insert)

  end



  defp escape_char(char), do: char

end