iban-ex/lib/iban_ex/parser.ex

119 lines
3.3 KiB
Elixir

defmodule IbanEx.Parser do
@moduledoc false
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() :: IbanEx.Iban.t()
@type iban_or_error() ::
{:ok, iban()}
| {:invalid_checksum, binary()}
| {:invalid_format, binary()}
| {:invalid_length, binary()}
| {:can_not_parse_map, binary()}
| {:unsupported_country_code, binary()}
@spec parse({:ok, binary()}) :: iban_or_error()
def parse({:ok, iban_string}), do: parse(iban_string)
def parse(iban_string, options \\ [incomplete: false])
def parse(iban_string, incomplete: false) do
case Validator.validate(iban_string) do
{:ok, valid_iban} ->
iban_map = %{
country_code: country_code(valid_iban),
check_digits: check_digits(valid_iban)
}
bban_map =
iban_string
|> bban()
|> parse_bban(iban_map.country_code)
{:ok, struct(Iban, Map.merge(iban_map, bban_map))}
{:error, error_type} ->
{:error, error_type}
end
end
def parse(iban_string, incomplete: true) do
iban_map = %{
country_code: country_code(iban_string),
check_digits: check_digits(iban_string)
}
bban = bban(iban_string)
case Country.is_country_code_supported?(iban_map.country_code) do
true ->
result =
parse_bban(bban, iban_map.country_code, incomplete: true)
|> Map.merge(iban_map)
{:ok, struct(Iban, result)}
false ->
{:error, :unsupported_country_code}
end
end
@spec parse_bban(binary(), <<_::16>>) :: map()
def parse_bban(bban_string, country_code, options \\ [incomplete: false])
def parse_bban(bban_string, country_code, incomplete: true) do
case Country.is_country_code_supported?(country_code) do
true ->
country_code
|> Country.country_module()
|> parse_bban_by_country_rules(bban_string)
false ->
%{}
end
end
def parse_bban(bban_string, country_code, incomplete: false) do
case Country.is_country_code_supported?(country_code) do
true ->
Country.country_module(country_code).rule()
|> parse_bban_by_regex(bban_string)
false ->
%{}
end
end
defp parse_bban_by_country_rules(country_module, bban_string) do
for {field, rule} <- country_module.rules,
into: %{},
do: {field, normalize_and_slice(bban_string, rule.range)}
end
defp parse_bban_by_regex(_regex, nil), do: %{}
defp parse_bban_by_regex(regex, bban_string) do
case Regex.named_captures(regex, bban_string) do
map when is_map(map) ->
for {key, val} <- map,
into: %{},
do: {String.to_atom(key), val}
nil ->
%{}
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