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PostgreSQL driver for Elixir
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lib/postgrex/extensions/path.ex
defmodule Postgrex.Extensions.Path do
@moduledoc false
import Postgrex.BinaryUtils, warn: false
use Postgrex.BinaryExtension, send: "path_send"
alias Postgrex.Extensions.Path
alias Postgrex.Extensions.Point
def encode(_) do
quote location: :keep do
%Postgrex.Path{open: o, points: ps} when is_list(ps) and is_boolean(o) ->
open_byte = Path.open_to_byte(o)
len = length(ps)
encoded_points = Enum.reduce(ps, [],
fn(p, acc) -> [acc | Point.encode_point(p, Postgrex.Path)] end)
# 1 byte for open/closed flag, 4 for length, 16 for each point
nbytes = 5 + 16 * len
[<<nbytes::int32>>, open_byte, <<len::int32>> | encoded_points]
other ->
raise ArgumentError, Postgrex.Utils.encode_msg(other, Postgrex.Path)
end
end
def decode(_) do
quote location: :keep do
<<nbytes::int32, path_data::binary-size(nbytes)>> ->
Path.decode_path(path_data)
end
end
def decode_path(<<o::int8, n::int32, point_data::binary-size(n)-unit(128)>>) do
open = (o == 1)
points = decode_points(point_data, [])
%Postgrex.Path{open: open, points: points}
end
def open_to_byte(true), do: 1
def open_to_byte(false), do: 0
defp decode_points(<<>>, points), do: Enum.reverse(points)
defp decode_points(<<x::float64, y::float64, rest::bits>>, points) do
decode_points(rest, [%Postgrex.Point{x: x, y: y} | points])
end
end