defmodule Zig.Type.Slice do
alias Zig.Type
use Type
import Type, only: :macros
defstruct [:child, :repr, has_sentinel?: false]
@type t :: %__MODULE__{
child: Type.t(),
repr: String.t(),
has_sentinel?: boolean
}
def from_json(
%{"child" => child, "has_sentinel" => has_sentinel?, "repr" => repr},
module
) do
%__MODULE__{
child: Type.from_json(child, module),
has_sentinel?: has_sentinel?,
repr: repr
}
end
def to_string(%{has_sentinel?: true, repr: repr}), do: repr
def to_string(slice), do: "[]#{Kernel.to_string(slice.child)}"
def to_call(%{has_sentinel?: true, repr: repr}), do: repr
def to_call(slice), do: "[]#{Type.to_call(slice.child)}"
# TYPE SPEC STUFF
def spec(%{child: ~t(u8)}, :return, opts) do
if Keyword.fetch!(opts, :type) == :list,
do: [Type.spec(~t(u8), :return, opts)],
else: binary_form(~t(u8))
end
def spec(%{child: ~t(u8)}, :param, opts) do
quote context: Elixir do
[unquote(Type.spec(~t(u8), :param, opts))] | unquote(binary_form(~t(u8)))
end
end
def spec(%{child: child}, context, opts) do
case {context, Keyword.get(opts, :type)} do
{:return, :binary} ->
binary_form(child) || raise "unreachable"
{:return, type} when type in ~w(default charlist)a ->
[Type.spec(child, :return, [])]
{:param, _} ->
if binary_form(child) do
quote context: Elixir do
unquote([Type.spec(child, :param, [])]) | unquote(binary_form(child))
end
else
[Type.spec(child, :param, [])]
end
end
end
defp binary_form(~t(u8)), do: Type.spec(:binary)
defp binary_form(%Type.Integer{bits: bits}) do
quote context: Elixir do
<<_::_*unquote(Type.Integer._next_power_of_two_ceil(bits))>>
end
end
defp binary_form(%Type.Float{bits: bits}) do
quote context: Elixir do
<<_::_*unquote(bits)>>
end
end
defp binary_form(%Type.Struct{packed: size}) when is_integer(size) do
quote context: Elixir do
<<_::_*unquote(size * 8)>>
end
end
defp binary_form(_), do: nil
# ETC
def return_allowed?(slice), do: Type.return_allowed?(slice.child)
def of(child, opts \\ []), do: struct(__MODULE__, [child: child] ++ opts)
end