posterize

defmodule :posterize_xt_float8 do
  @moduledoc false
  import Postgrex.BinaryUtils, warn: false
  use Postgrex.BinaryExtension, send: "float8send"

  def encode(_) do
    quote location: :keep do
      n when is_number(n) ->
        << 8 :: int32, n :: float64 >>
      :NaN ->
        << 8 :: int32, 0 :: 1, 2047 :: 11, 1 :: 1, 0 :: 51 >>
      :infinity ->
        << 8 :: int32, 0 :: 1, 2047 :: 11, 0 :: 52 >>
      :'-infinity' ->
        << 8 :: int32, 1 :: 1, 2047 :: 11, 0 :: 52 >>
      other ->
        raise ArgumentError, Postgrex.Utils.encode_msg(other, "a float")
    end
  end

  def decode(_) do
    quote location: :keep do
      << 8 :: int32, 0 :: 1, 2047 :: 11, 0 :: 52 >> -> :infinity
      << 8 :: int32, 1 :: 1, 2047 :: 11, 0 :: 52 >> -> :'-infinity'
      << 8 :: int32, _ :: 1, 2047 :: 11, _ :: 52 >> -> :NaN
      << 8 :: int32, float :: float64 >>            -> float
    end
  end
end