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Localization (parsing, formatting) of numbers, dates/time/calendar, units of measure, messages and lists. Includes localized collation.

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localize lib localize datetime timezone builder.ex
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lib/localize/datetime/timezone/builder.ex 

defmodule Localize.DateTime.Timezone.Builder do

  @moduledoc false



  # Compile-time helpers for `Localize.DateTime.Timezone`.

  #

  # Lives outside `Localize.SupplementalData` so SupplementalData has

  # no compile- or run-time dependency on `Localize.Validity.*` (which

  # would form a compile-connected cycle).



  # Builds a map of validated territory atoms to lists of timezone

  # zone maps from the raw CLDR timezone data. Each zone map has the

  # original timezone fields plus a `:short_zone` key holding the

  # BCP 47 short zone code. Territories that fail validation or are

  # `nil` are excluded.

  @doc false

  @spec timezones_by_territory(%{String.t() => map()}) :: %{atom() => [map()]}

  def timezones_by_territory(timezones) do

    timezones

    |> Enum.group_by(

      fn {_key, value} -> value.territory end,

      fn {key, value} -> Map.put(value, :short_zone, key) end

    )

    |> Enum.map(fn

      {nil, _} ->

        nil



      {territory, zones} ->

        case Localize.Validity.Territory.validate(territory) do

          {:ok, validated_territory, _status} ->

            {validated_territory, List.flatten(zones)}



          {:error, _} ->

            nil

        end

    end)

    |> Enum.reject(&is_nil/1)

    |> Map.new()

  end



  # Inverts `timezones_by_territory/1` so that each timezone alias

  # maps to its territory atom. The synthetic `:UT` territory is

  # excluded.

  @doc false

  @spec territories_by_timezone(%{atom() => [map()]}) :: %{String.t() => atom()}

  def territories_by_timezone(timezones_by_territory) do

    timezones_by_territory

    |> Enum.flat_map(fn {territory, zones} -> territory_zone_aliases(territory, zones) end)

    |> Enum.reject(fn {_zone, territory} -> territory == :UT end)

    |> Map.new()

  end



  # Pairs each alias of each zone with its territory.

  defp territory_zone_aliases(territory, zones) do

    Enum.flat_map(zones, fn zone ->

      Enum.map(zone.aliases, fn zone_alias -> {zone_alias, territory} end)

    end)

  end

end