Ruby-Stemmer¶ ↑

Ruby-Stemmer exposes SnowBall API to Ruby.

This package includes libstemmer_c library released under BSD licence and available for free here.

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¶ ↑

# Rails2: -- config/environment.rb:
config.gem 'ruby-stemmer', :version => '>=0.6.2', :lib => 'lingua/stemmer'

# Rails3: -- Gemfile
gem 'ruby-stemmer', '>=0.8.3', :require => 'lingua/stemmer'

More details ¶ ↑

Complete API in RDoc format
More usage on the test file

Install¶ ↑

Standard install with:¶ ↑

gem install ruby-stemmer

Windows¶ ↑

There’s also a Windows (Fat bin) compiled against ruby versions: 1.8.7, 1.9.3, 2.1.5, 2.2.0

gem install ruby-stemmer --platform=x86-mingw32

As far as I know the above should work with rubyinstaller. If if fails, you could try with:

gem install ruby-stemmer --platform=x86-mswin32

It’s known to work under Windows XP.

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

Cross Compiling¶ ↑

Install rake-compiler-dev-box and follow the setup. Inside vagrant box run:

$ cd /vagrant
$ RUBY_CC_VERSION=1.8.7:1.9.3:2.1.5:2.2.0 package_win32_fat_binary ruby-stemmer

Idea is to have same builds as in travis.yml.

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:

TODO¶ ↑

Open issues

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¶ ↑

Contributors¶ ↑

Aurelian Oancea
Yury Korolev - various bug fixes
Aaron Patterson - rake compiler (windows support), code cleanup
Damián Silvani - Ruby 1.9 encoding

Real life usage¶ ↑

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

# encoding: utf-8

psadda/ruby-stemmer