119 lines
3.3 KiB
Elixir
119 lines
3.3 KiB
Elixir
defmodule IbanEx.Parser do
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@moduledoc false
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alias IbanEx.{Country, Iban, Validator}
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import IbanEx.Commons, only: [normalize_and_slice: 2]
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@type iban_string() :: String.t()
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@type country_code_string() :: <<_::16>>
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@type check_digits_string() :: <<_::16>>
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@type iban() :: IbanEx.Iban.t()
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@type iban_or_error() ::
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{:ok, iban()}
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| {:invalid_checksum, binary()}
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| {:invalid_format, binary()}
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| {:invalid_length, binary()}
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| {:can_not_parse_map, binary()}
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| {:unsupported_country_code, binary()}
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@spec parse({:ok, binary()}) :: iban_or_error()
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def parse({:ok, iban_string}), do: parse(iban_string)
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def parse(iban_string, options \\ [incomplete: false])
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def parse(iban_string, incomplete: false) do
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case Validator.validate(iban_string) do
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{:ok, valid_iban} ->
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iban_map = %{
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country_code: country_code(valid_iban),
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check_digits: check_digits(valid_iban)
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}
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bban_map =
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iban_string
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|> bban()
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|> parse_bban(iban_map.country_code)
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{:ok, struct(Iban, Map.merge(iban_map, bban_map))}
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{:error, error_type} ->
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{:error, error_type}
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end
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end
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def parse(iban_string, incomplete: true) do
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iban_map = %{
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country_code: country_code(iban_string),
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check_digits: check_digits(iban_string)
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}
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bban = bban(iban_string)
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case Country.is_country_code_supported?(iban_map.country_code) do
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true ->
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result =
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parse_bban(bban, iban_map.country_code, incomplete: true)
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|> Map.merge(iban_map)
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{:ok, struct(Iban, result)}
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false ->
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{:error, :unsupported_country_code}
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end
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end
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@spec parse_bban(binary(), <<_::16>>) :: map()
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def parse_bban(bban_string, country_code, options \\ [incomplete: false])
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def parse_bban(bban_string, country_code, incomplete: true) do
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case Country.is_country_code_supported?(country_code) do
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true ->
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country_code
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|> Country.country_module()
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|> parse_bban_by_country_rules(bban_string)
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false ->
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%{}
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end
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end
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def parse_bban(bban_string, country_code, incomplete: false) do
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case Country.is_country_code_supported?(country_code) do
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true ->
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Country.country_module(country_code).rule()
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|> parse_bban_by_regex(bban_string)
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false ->
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%{}
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end
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end
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defp parse_bban_by_country_rules(country_module, bban_string) do
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for {field, rule} <- country_module.rules,
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into: %{},
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do: {field, normalize_and_slice(bban_string, rule.range)}
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end
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defp parse_bban_by_regex(_regex, nil), do: %{}
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defp parse_bban_by_regex(regex, bban_string) do
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case Regex.named_captures(regex, bban_string) do
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map when is_map(map) ->
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for {key, val} <- map,
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into: %{},
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do: {String.to_atom(key), val}
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nil ->
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%{}
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end
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end
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@spec country_code(iban_string()) :: country_code_string()
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def country_code(iban_string), do: normalize_and_slice(iban_string, 0..1)
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@spec check_digits(binary()) :: check_digits_string()
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def check_digits(iban_string), do: normalize_and_slice(iban_string, 2..3)
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@spec bban(binary()) :: binary()
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def bban(iban_string), do: normalize_and_slice(iban_string, 4..-1//1)
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end
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