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Membrane Multimedia Framework (Core)
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lib/membrane/core/callback_context.ex
defmodule Membrane.Core.CallbackContext do
@moduledoc false
@callback extract_default_fields(state :: Macro.t(), args :: keyword(Macro.t())) ::
keyword(Macro.t())
defmacro __using__(default_fields) do
quote do
@behaviour unquote(__MODULE__)
@impl true
def extract_default_fields(_state, args) do
args
end
defoverridable unquote(__MODULE__)
@macrocallback from_state(state :: Macro.t(), args :: keyword(Macro.t())) :: Macro.t()
unquote(nested_using({:quote, [], [[do: default_fields]]}))
end
end
defp nested_using(default_fields) do
quote do
defmacro __using__(fields) do
default_fields = unquote(default_fields)
quote do
require unquote(__MODULE__)
@behaviour unquote(__MODULE__)
@type t :: %__MODULE__{unquote_splicing(fields ++ default_fields)}
fields_names = unquote(Keyword.keys(fields))
default_fields_names = unquote(Keyword.keys(default_fields))
@enforce_keys Module.get_attribute(__MODULE__, :enforce_keys, fields_names) ++
default_fields_names
defstruct fields_names ++ default_fields_names
@impl true
defmacro from_state(state, args \\ []) do
module = unquote(__MODULE__)
quote do
require unquote(module)
%unquote(__MODULE__){
unquote_splicing(module.extract_default_fields(state, args))
}
end
end
defoverridable unquote(__MODULE__)
end
end
end
end
end