Make country_code_to_region_code_map public

lib/ex_phone_number.ex

@@ -33,6 +33,7 @@ defmodule ExPhoneNumber do
   alias ExPhoneNumber.Formatting
   alias ExPhoneNumber.Parsing
   alias ExPhoneNumber.Validation
+  alias ExPhoneNumber.Metadata
 
   def format(%ExPhoneNumber.Model.PhoneNumber{} = phone_number, phone_number_format)
       when is_atom(phone_number_format),
@@ -52,4 +53,9 @@ defmodule ExPhoneNumber do
 
   def parse(number_to_parse, default_region),
     do: Parsing.parse(number_to_parse, default_region)
+
+  @doc """
+  Returns a map of country codes to region codes.
+  """
+  defdelegate country_code_to_region_code_map(), to: Metadata
 end

lib/ex_phone_number/metadata.ex

@@ -53,7 +53,8 @@ defmodule ExPhoneNumber.Metadata do
       Map.put(acc, new_key, Keyword.get_values(list_cctrc, key))
     end)
 
-  defp country_code_to_region_code_map() do
+  @doc false
+  def country_code_to_region_code_map() do
     unquote(Macro.escape(map_cctrc))
   end
 

test/ex_phone_number/metadata_test.exs

@@ -512,4 +512,12 @@ defmodule ExPhoneNumber.MetadataTest do
       end
     end
   end
+
+  describe "country_code_to_region_code_map" do
+    test "returns a map of country phone prefixes to region codes" do
+      result = country_code_to_region_code_map()
+      assert is_map(result)
+      assert Map.get(result, 1) == ["US", "CA", "BS", "BB"]
+    end
+  end
 end