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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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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} ->
Enum.flat_map(zones, fn zone ->
Enum.map(zone.aliases, fn zone_alias -> {zone_alias, territory} end)
end)
end)
|> Enum.reject(fn {_zone, territory} -> territory == :UT end)
|> Map.new()
end
end