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Rust templates and quasiquoting for Elixir

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rustq lib rustq rustler atom_decoder.ex
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lib/rustq/rustler/atom_decoder.ex 

defmodule RustQ.Rustler.AtomDecoder do

  @moduledoc false



  use RustQ.Sigil



  alias RustQ.Rust



  @template ~R"""

  pub fn __rq_fn_name(value: __rq_input!()) -> __rq_result!() {

      match value {

          __rq_arms => unreachable!(),

      }

  }

  """



  @spec build(atom() | String.t(), keyword()) :: Rust.Fragment.t()

  def build(name, opts) do

    input = Keyword.get(opts, :input, :Atom)

    returns = Keyword.fetch!(opts, :returns)

    result = Keyword.get(opts, :result, "NifResult<#{Rust.type(returns)}>")

    atoms = Keyword.get(opts, :atoms, "atoms")

    unknown = Keyword.get(opts, :unknown, "Err(rustler::Error::BadArg)")



    arms =

      opts

      |> Keyword.fetch!(:cases)

      |> Enum.map(fn {atom, value} ->

        Rust.arm("value if value == #{atoms}::#{atom}()", "Ok(#{Rust.type(value)})")

      end)

      |> Kernel.++([Rust.arm("_", unknown)])



    @template

    |> RustQ.render!("rustler_atom_decoder.rs",

      bind: [fn_name: name, input: Rust.expr(Rust.type(input)), result: Rust.expr(result)],

      splice: [arms: arms]

    )

    |> Rust.item()

  end

end