GTIN

Add this line to your application's Gemfile:

gem 'salsify-gtin'

And then execute:

$ bundle

Or install it yourself as:

$ gem install salsify-gtin

And load it with:

$ require 'gtin'

This gem is all about validating GTIN-compatible identifiers and converting them to a standardized GTIN-14 representation. Supported input types include GTIN, EAN-13, UPC-A, UPC-E, ISBN-10, ISBN-13, and ISSN. Inputs must be strings containing only digits and include the check digit (see examples below).

# UPC-A
GTIN.to_gtin('UPC', '123412341230') => '00123412341230'
GTIN.compute_checksum_gtin('12341234123') =>'0' # UPC-A is a subset of GTIN
GTIN.compute_checksum_gtin('0012341234123') =>'0'

# UPC-E
GTIN.to_gtin('UPC', '1236432') => '00012300000642'

# ISBN-10
GTIN.to_gtin('ISBN', '0306406152') => '09780306406157'
GTIN.compute_checksum_isbn10('030640615') =>'2'
GTIN.compute_checksum_gtin('0978030640615') =>'7' # ISBN-13 is a subset of GTIN

# ISBN-13 with an incorrect check digit
GTIN.to_gtin('ISBN', '9780306406150') => GtinValidationError (invalid checksum)

After checking out the repo, run bin/setup to install dependencies. Then, run rake spec to run the tests. You can also run bin/console for an interactive prompt that will allow you to experiment.

To install this gem onto your local machine, run bundle exec rake install.

To release a new version, update the version number in version.rb, and then run bundle exec rake release, which will create a git tag for the version, push git commits and tags, and push the .gem file to rubygems.org .

Bug reports and pull requests are welcome on GitHub at https://github.com/salsify/gtin

The gem is available as open source under the terms of the MIT License.