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retired
0.1.0
NIF based bindings for libvips
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lib/vix/vips/flag.ex
defmodule Vix.Vips.FlagHelper do
@moduledoc false
def __before_compile__(env) do
for {name, flag} <- Vix.Nif.nif_vips_flag_list() do
def_vips_flag(name, flag, env)
end
quote do
end
end
def def_vips_flag(name, flag, env) do
module_name = Module.concat(Vix.Vips.Flag, name)
{flag_str_list, _} = Enum.unzip(flag)
spec = Enum.reduce(flag_str_list, &{:|, [], [&1, &2]})
contents =
quote do
# Internal module
@moduledoc false
import Bitwise, only: [bor: 2]
@type t() :: unquote(spec)
alias Vix.Type
@behaviour Type
@impl Type
def typespec do
quote do
list(unquote(__MODULE__).t())
end
end
@impl Type
def default(default), do: default
@impl Type
def to_nif_term(flags, _data) do
Enum.reduce(flags, 0, fn flag, value ->
bor(value, to_nif_term(flag))
end)
end
@impl Type
def to_erl_term(value) do
Integer.to_string(value, 2)
|> String.codepoints()
|> Enum.map(fn v ->
{v, ""} = Integer.parse(v, 2)
erl_term(v)
end)
end
unquote(
Enum.map(flag, fn {name, value} ->
quote do
defp to_nif_term(unquote(name)), do: unquote(value)
defp erl_term(unquote(value)), do: unquote(name)
end
end)
)
end
Module.create(module_name, contents, line: env.line, file: env.file)
end
end
defmodule Vix.Vips.Flag do
@moduledoc false
@before_compile Vix.Vips.FlagHelper
end