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dataspecs's Issues

Compile time type_loader "generation"

Can we generate the type loaders functions at compile time?
No more lazy generation at runtime (drop ETS caching) and no more strip_beams: false to take the types metadata in the prod release.

defmodule
  use DataSpec  # To use DataSpec.load on this module's types

  # ...
end

DataSpecs Schema

Map the Erlang Type Abstract Format to an Intermediate structured schema representation.
Use the schema to build the DataSpecs loader

Humanize errors

Improve the error "stack" trace.

defmodule Test.DataSpecs.A do
  @moduledoc false

  use DataSpecs

  @enforce_keys [:f_1]
  defstruct [:f_1]

  @type t :: %__MODULE__{
          f_1: %{a: [atom() | {integer(), term()}]},
        }
end

The following incorrect value:

%Test.DataSpecs.A{f_1: %{a: [:a, {:"BAD TYPE HERE", 1}]}}
|> Test.DataSpecs.A.load()

produce this error:

{:error,
 [
   "can't convert %Test.DataSpecs.A{f_1: %{a: [:a, {:\"BAD TYPE HERE\", 1}]}} to a %Test.DataSpecs.A{} struct",
   ["can't convert %Test.DataSpecs.A{f_1: %{a: [:a, {:\"BAD TYPE HERE\", 1}]}} to a map, bad k/v pairs: %{f_1: %{a: [:a, {:\"BAD TYPE HERE\", 1}]}}",
    []]
 ]}

While correct a bit cryptic. Should be humanized!

Ideally should report something like:

%Test.DataSpecs.A{f_1: %{a: [:a, {:"BAD TYPE HERE", 1}]}}
                                  ^
Expected an integer(), got an atom()

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