Ruby-Stemmer¶ ↑

Ruby-Stemmer exposes SnowBall API to Ruby.

This package includes libstemmer_c library released under BSD licence and available for free at: snowball.tartarus.org/dist/libstemmer_c.tgz. Support for latin language is also included and it has been generated with the snowball compiler using schinke contribution

For more details about libstemmer_c please visit the SnowBall website.

Usage¶ ↑

require 'rubygems'
require 'lingua/stemmer'

stemmer= Lingua::Stemmer.new(:language => "ro")
stemmer.stem("netăgăduit") #=> netăgădu

Alternative¶ ↑

require 'rubygems'
require 'lingua/stemmer'

Lingua.stemmer( %w(incontestabil neîndoielnic), :language => "ro" ) #=> ["incontest", "neîndoieln"]
Lingua.stemmer("installation") #=> "instal"
Lingua.stemmer("installation", :language => "fr", :encoding => "ISO_8859_1") do | word |
  puts "~> #{word}" #=> "instal"
end # => #<Lingua::Stemmer:0x102501e48>

Rails¶ ↑

# in config/environment.rb:
config.gem 'ruby-stemmer', :version => '>=0.6.2', :lib => 'lingua/stemmer'

More details ¶ ↑

• Complete API in RDoc format

• More usage on the test file

Install¶ ↑

Standard install with:¶ ↑

gem install ruby-stemmer

Please not that Windows is not supported at this time.

Development version¶ ↑

$ git clone git://github.com/aurelian/ruby-stemmer.git
$ cd ruby-stemmer
$ rake -T #<== see what we've got
$ rake compile #<== builds the extension do'h
$ rake test

NOT A BUG¶ ↑

The stemming process is an algorithm to allow one to find the stem of an word (not the root of it). For further reference on stem vs. root, please check wikipedia articles on the topic:

• en.wikipedia.org/wiki/Stem_%28linguistics%29

• en.wikipedia.org/wiki/Root_%28linguistics%29

TODO¶ ↑

• Open issues

• Release Windows Gem

Note on Patches/Pull Requests¶ ↑

• Fork the project from github

• Make your feature addition or bug fix

• Add tests for it. This is important so I don’t break it in a future version unintentionally.

• Commit, do not mess with rakefile, version, or history.

  if you want to have your own version, that is fine but bump version in a commit by itself I can ignore when I pull

• Send me a pull request. Bonus points for topic branches.

Alternative Stemmers for Ruby¶ ↑

• stemmer4r (ext)

• fast-stemmer (ext)

• uea-stemmer (ext)

• stemmer (pure ruby)

• add yours

Copyright¶ ↑

Copyright © 2008-2010 Aurelian Oancea. See MIT-LICENSE for details.

Contributors¶ ↑

• Aurelian Oancea

• Yury Korolev - various bug fixes

• Aaron Patterson - rake compiler (windows support), code cleanup

Real life usage¶ ↑

• planet33.ru is using Ruby-Stemmer together with Classifier to automatically rate places based on users comments.

• textamatch_rb is using the Ruby-Stemmer to catch errors in suffixes while it discovers if two scientific names are actually the same.