initial commit

.formatter.exs

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+# Used by "mix format"
+[
+  inputs: ["mix.exs", "{config,lib,test}/**/*.{ex,exs}"]
+]

.gitignore

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+# The directory Mix will write compiled artifacts to.
+/_build/
+
+# If you run "mix test --cover", coverage assets end up here.
+/cover/
+
+# The directory Mix downloads your dependencies sources to.
+/deps/
+
+# Where 3rd-party dependencies like ExDoc output generated docs.
+/doc/
+
+# Ignore .fetch files in case you like to edit your project deps locally.
+/.fetch
+
+# If the VM crashes, it generates a dump, let's ignore it too.
+erl_crash.dump
+
+# Also ignore archive artifacts (built via "mix archive.build").
+*.ez
+
+# Ignore package tarball (built via "mix hex.build").
+miniban-*.tar
+

README.md

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+# Miniban
+
+**TODO: Add description**
+
+## Installation
+
+If [available in Hex](https://hex.pm/docs/publish), the package can be installed
+by adding `miniban` to your list of dependencies in `mix.exs`:
+
+```elixir
+def deps do
+  [
+    {:miniban, "~> 0.1.0"}
+  ]
+end
+```
+
+Documentation can be generated with [ExDoc](https://github.com/elixir-lang/ex_doc)
+and published on [HexDocs](https://hexdocs.pm). Once published, the docs can
+be found at [https://hexdocs.pm/miniban](https://hexdocs.pm/miniban).
+

benchmarks/validate_iban.exs

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+iterations = 100_000
+iban = "MD75EX0900002374642125EU"
+
+Benchee.run(%{
+  "Miniban" => fn -> for _ <- 0..iterations, do: Miniban.is_valid_iban?(iban) end,
+  "Bankster" => fn -> for _ <- 0..iterations, do: Bankster.iban_valid?(iban) end,
+})

config/config.exs

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+# This file is responsible for configuring your application
+# and its dependencies with the aid of the Mix.Config module.
+use Mix.Config
+
+# This configuration is loaded before any dependency and is restricted
+# to this project. If another project depends on this project, this
+# file won't be loaded nor affect the parent project. For this reason,
+# if you want to provide default values for your application for
+# 3rd-party users, it should be done in your "mix.exs" file.
+
+# You can configure your application as:
+#
+#     config :miniban, key: :value
+#
+# and access this configuration in your application as:
+#
+#     Application.get_env(:miniban, :key)
+#
+# You can also configure a 3rd-party app:
+#
+#     config :logger, level: :info
+#
+
+# It is also possible to import configuration files, relative to this
+# directory. For example, you can emulate configuration per environment
+# by uncommenting the line below and defining dev.exs, test.exs and such.
+# Configuration from the imported file will override the ones defined
+# here (which is why it is important to import them last).
+#
+#     import_config "#{Mix.env}.exs"

lib/miniban.ex

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+defmodule Miniban do
+  @moduledoc """
+  Documentation for Miniban.
+  """
+
+  @country_code_len %{
+    "AD" => 24, "AE" => 23, "AT" => 20, "AZ" => 28, "BA" => 20, "BE" => 16, "BG" => 22, "BH" => 22, "BR" => 29,
+    "CH" => 21, "CR" => 21, "CY" => 28, "CZ" => 24, "DE" => 22, "DK" => 18, "DO" => 28, "EE" => 20, "ES" => 24,
+    "FI" => 18, "FO" => 18, "FR" => 27, "GB" => 22, "GI" => 23, "GL" => 18, "GR" => 27, "GT" => 28, "HR" => 21,
+    "HU" => 28, "IE" => 22, "IL" => 23, "IS" => 26, "IT" => 27, "JO" => 30, "KW" => 30, "KZ" => 20, "LB" => 28,
+    "LI" => 21, "LT" => 20, "LU" => 20, "LV" => 21, "MC" => 27, "MD" => 24, "ME" => 22, "MK" => 19, "MR" => 27,
+    "MT" => 31, "MU" => 30, "NL" => 18, "NO" => 15, "PK" => 24, "PL" => 28, "PS" => 29, "PT" => 25, "QA" => 29,
+    "RO" => 24, "RS" => 22, "SA" => 24, "SE" => 24, "SI" => 19, "SK" => 24, "SM" => 27, "TN" => 24, "TR" => 26,
+  }
+
+  @doc """
+    Validate an IBAN
+  """
+  def is_valid_iban?(input) do
+    { prefix, rest } = String.replace(input, ~r/ +/, "")
+      |> String.upcase()
+      |> String.split_at(4)
+
+    iban = rest <> prefix
+
+    @country_code_len[String.slice(prefix, 0..1)] == String.length(iban) &&
+      1 == Regex.replace(~r/[A-Z]/, iban, fn << c :: 8 >> -> to_string(c - 55) end)
+      |> String.to_integer()
+      |> rem(97)
+  end
+end

mix.exs

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+defmodule Miniban.MixProject do
+  use Mix.Project
+
+  def project do
+    [
+      app: :miniban,
+      version: "0.1.0",
+      elixir: "~> 1.6-dev",
+      start_permanent: Mix.env() == :prod,
+      deps: deps()
+    ]
+  end
+
+  # Run "mix help compile.app" to learn about applications.
+  def application do
+    [
+      extra_applications: [:logger]
+    ]
+  end
+
+  # Run "mix help deps" to learn about dependencies.
+  defp deps do
+    [
+      # for benchmarks comparison
+      {:benchee, "~> 0.10", only: :dev},
+      {:bankster, "~> 0.2.2", only: :dev}
+    ]
+  end
+end

mix.lock

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+%{
+  "bankster": {:hex, :bankster, "0.2.2", "28015dc2a05e44fd6bf8f2920532d8df60c687430b1e0a9927e8bfc805395faa", [], [], "hexpm"},
+  "benchee": {:hex, :benchee, "0.10.0", "7227e83ab81e4753610125d251bbf78c99167fbe7f931a8cbfbc3eda8526259c", [], [{:deep_merge, "~> 0.1", [hex: :deep_merge, repo: "hexpm", optional: false]}], "hexpm"},
+  "deep_merge": {:hex, :deep_merge, "0.1.1", "c27866a7524a337b6a039eeb8dd4f17d458fd40fbbcb8c54661b71a22fffe846", [], [], "hexpm"},
+}

test/miniban_test.exs

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+defmodule MinibanTest do
+  use ExUnit.Case
+  doctest Miniban
+
+  @valid [
+    "MD75EX0900002374642125EU",
+    "BE68539007547034",
+    "NL86INGB0002445588",
+  ]
+
+  @invalid [
+    "ZZ68539007547034",
+    "BE68539007547035",
+  ]
+
+  test "valid iban" do
+    assert Enum.reduce(@valid, true, fn iban, ok -> ok && Miniban.is_valid_iban?(iban) end)
+  end
+  test "invalid iban" do
+    refute Enum.reduce(@invalid, true, fn iban, ok -> ok && Miniban.is_valid_iban?(iban) end)
+  end
+end

test/test_helper.exs

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+ExUnit.start()