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exd lib exd query rewriter.ex
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lib/exd/query/rewriter.ex 

defmodule Exd.Query.Rewriter do

  @moduledoc """

  Performs a number of rewrites on query

  """

  alias Exd.Query



  @rules [

    Exd.Query.Rewriter.Rules.Interpolation,

    Exd.Query.Rewriter.Rules.Unnest

  ]



  @spec rewrite(Query.t()) :: Query.t()

  def rewrite(query) do

    query

    |> rewrite_select

  end



  defp rewrite_select(%Query{select: select} = query) when is_map(select) do

    {select, query} =

      select

      |> Enum.reduce({%{}, query}, fn {key, value}, {select_acc, outer_query_acc} ->

        {rewritten_value, rewritten_query} =

          @rules

          |> Enum.reduce({value, outer_query_acc}, fn rule, {value_acc, query_acc} ->

            rule.rewrite(key, value_acc, query_acc)

          end)

        {Map.put(select_acc, key, rewritten_value), rewritten_query}

      end)



    %Query{query | select: select}

  end

  defp rewrite_select(query), do: query



end