iban-ex/lib/iban_ex/parser.ex

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Elixir
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2024-03-05 11:02:58 +00:00
defmodule IbanEx.Parser do
alias IbanEx.{Country, Iban, Validator}
import IbanEx.Commons, only: [normalize_and_slice: 2]
@type iban_string() :: String.t()
@type country_code_string() :: <<_::16>>
@type check_digits_string() :: <<_::16>>
@type iban_or_error() :: IbanEx.Iban.t() | {:error, atom()}
@spec parse({:ok, String.t()} | String.t()) :: iban_or_error()
def parse({:ok, iban_string}), do: parse(iban_string)
def parse(iban_string) do
with {:ok, valid_iban} <- Validator.validate(iban_string) do
iban_map = %{
country_code: country_code(valid_iban),
check_digits: check_digits(valid_iban),
}
regex = Country.country_module(iban_map.country_code).rule()
bban = bban(iban_string)
bban_map = for {key, val} <- Regex.named_captures(regex, bban), into: %{}, do: {String.to_atom(key), val}
{:ok, struct(Iban, Map.merge(iban_map, bban_map))}
else
{:error, error_type} -> {:error, error_type}
end
end
@spec country_code(iban_string()) :: country_code_string()
def country_code(iban_string), do: normalize_and_slice(iban_string, 0..1)
@spec check_digits(binary()) :: check_digits_string()
def check_digits(iban_string), do: normalize_and_slice(iban_string, 2..3)
@spec bban(binary()) :: binary()
def bban(iban_string), do: normalize_and_slice(iban_string, 4..-1//1)
end