Steuernummer

Steuernummer is a very simple Gem that uses regex to validate all german tax numbers (or steuernummer). It is able to generate a country wide code, and find the region where the steuernummer comes from. Data is based on: http://de.wikipedia.org/wiki/Steuernummer

Installation

Add this line to your application's Gemfile:

gem 'steuernummer'

And then execute:

$ bundle

Or install it yourself as:

$ gem install steuernummer

Development

Test with: $ rake test

Load directly in IRB with: $ irb -I lib $ require 'steuernummer'

Usage

Validate your German Steuernummer

  # Arguments:
  #    steuernummer: (String) -- regional or countrywide number
  #    region:       (String) -- 'unknown' or one of Steuernummer.valid_regions



   Example:
   >> tax_no = Steuernummer.new("93815/08152", 'Baden-Württemberg')
   >> tax_no.is_valid?
   => true
  
   >> tax_no.country_wide_number
   => {:number => '2893081508152', :region => 'Baden-Württemberg')
  
  # ----------------------------------------------------------------
  
   >> tax_no = Steuernummer.new("2893081508152")
   >> tax_no.is_valid?
   => true
  
   >> tax_no.region_wide_number
   => {:number => '93815/08152', :region => 'Baden-Württemberg')
  
  #  ----------------------------------------------------------------

  >> tax_no = Steuernummer.new('151/815/08156','unknown')
  >> tax_no.is_valid?
  => true

  >> tax_no.region_wide_number
  => {:number => '151/815/08156', :region => 'unknown'}
 
  >> tax_no.country_wide_number
  => RuntimeError: "Can't determine country wide number for a region wide number without knowing the region...."
  
  
  #  ----------------------------------------------------------------
 
  >> Steuernummer.valid_regions
  => ["Baden-Württemberg", "Bayern", "Berlin", "Brandenburg",....]

Contributing

Fork it
Create your feature branch (git checkout -b my-new-feature)
Commit your changes (git commit -am 'Add some feature')
Push to the branch (git push origin my-new-feature)
Create new Pull Request