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The typed, attribute-queryable in-memory store for ETS and Mnesia. A simple ORM with record expiry (TTL), crash resilience, and atomic take-once reads.

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active_memory lib query match_spec.ex
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lib/query/match_spec.ex 

defmodule ActiveMemory.Query.MatchSpec do

  @moduledoc false



  @result [:"$_"]



  def build(query, query_map, match_head) do

    [{match_head, [reduce(query, query_map)], @result}]

  end



  defp reduce({operand, lhs, rhs}, query_map) when is_tuple(lhs) and is_tuple(rhs) do

    {translate(operand), reduce(lhs, query_map), reduce(rhs, query_map)}

  end



  defp reduce({operand, lhs, rhs}, query_map) when is_tuple(lhs) do

    {translate(operand), reduce(lhs, query_map), rhs}

  end



  defp reduce({operand, lhs, rhs}, query_map) when is_tuple(rhs) do

    {translate(operand), lhs, reduce(rhs, query_map)}

  end



  defp reduce({operand, attribute, value}, query_map)

       when is_atom(attribute) and not is_tuple(value) and is_map(query_map) do

    variable = Map.get(query_map, attribute, attribute)

    {translate(operand), variable, value}

  end



  defp reduce({operand, attribute, value}, query_map)

       when is_atom(attribute) and not is_tuple(value) do

    variable = Keyword.get(query_map, attribute, attribute)

    {translate(operand), variable, value}

  end



  defp reduce({atom, meta, _} = ast, _query_map) when is_atom(atom) and is_list(meta), do: ast



  defp translate(:<=), do: :"=<"



  defp translate(:!=), do: :"/="



  defp translate(:===), do: :"=:="



  defp translate(:!==), do: :"=/="



  defp translate(operand), do: operand

end