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Rust templates and quasiquoting for Elixir

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rustq lib rustq rust ast node_dsl.ex
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lib/rustq/rust/ast/node_dsl.ex 

defmodule RustQ.Rust.AST.NodeDSL do

  @moduledoc """

  Defines RustQ AST node modules with schema metadata and typed structs.

  """



  defmacro defnode(name, category, fields, opts \\ []) do

    type_ast = opts |> Keyword.fetch!(:type) |> quoted_type_ast()



    quote do

      defmodule unquote(name) do

        @moduledoc """

        RustQ AST node generated by `RustQ.Rust.AST.NodeDSL.defnode/4`.

        """

        defstruct unquote(fields)



        @rustq_ast_category unquote(category)

        def __rustq_ast_category__, do: @rustq_ast_category



        @type t :: unquote(type_ast)

      end

    end

  end



  defp quoted_type_ast({:quote, _meta, [[do: ast]]}), do: ast

  defp quoted_type_ast(ast), do: ast

end