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reach lib reach source.ex
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lib/reach/source.ex 

defmodule Reach.Source do

  @moduledoc "Helpers for attaching source-origin metadata to lowered AST."



  alias Reach.Source.{Origin, Span}



  @metadata_key :reach



  def metadata_key, do: @metadata_key



  def origin(meta) when is_list(meta), do: Keyword.get(meta, @metadata_key)

  def origin(_), do: nil



  def put_origin({form, meta, args}, %Origin{} = origin) when is_list(meta) and is_list(args) do

    {form, Keyword.put(meta, @metadata_key, origin), args}

  end



  def put_origin(ast, _origin), do: ast



  def span_from_origin(%Origin{span: span}), do: Span.to_map(span)

  def span_from_origin(_), do: nil

end