Class: LanguageDetector

Inherits:
Object
  • Object
show all
Defined in:
lib/language_detector.rb

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.train ⇒ Object 



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# File 'lib/language_detector.rb', line 20

def self.train
  
  # For a full list of ISO 639 language tags visit:
  
  # http:#www.loc.gov/standards/iso639-2/englangn.html

  #LARGE profiles follow:

  #NOTE: These profiles taken from the "World War II" node on wikipedia
  #with the 'lang' and ?action=raw URI which results in a UTF8 encoded
  #file.  If we need to get more profile data for a language this is
  #always a good source of data.
  #
  # http:#en.wikipedia.org/wiki/World_War_II
  
  training_data = [
    # af (afrikaans)
    [ "ar", "ar-utf8.txt", "utf8", "arabic" ],
    [ "bg", "bg-utf8.txt", "utf8", "bulgarian" ],
    # bs (bosnian )
    # ca (catalan)
    [ "cs", "cs-utf8.txt", "utf8", "czech" ],
    # cy (welsh)
    [ "da", "da-iso-8859-1.txt", "iso-8859-1", "danish" ],
    [ "de", "de-utf8.txt", "utf8", "german" ],
    [ "el", "el-utf8.txt", "utf8", "greek" ],
    [ "en", "en-iso-8859-1.txt", "iso-8859-1", "english" ],
    [ "et", "et-utf8.txt", "utf8", "estonian" ],
    [ "es", "es-utf8.txt", "utf8", "spanish" ],
    [ "fa", "fa-utf8.txt", "utf8", "farsi" ],
    [ "fi", "fi-utf8.txt", "utf8", "finnish" ],
    [ "fr", "fr-utf8.txt", "utf8", "french" ],
    [ "fy", "fy-utf8.txt", "utf8", "frisian" ],
    [ "ga", "ga-utf8.txt", "utf8", "irish" ],
    #gd (gaelic)
    #haw (hawaiian)
    [ "he", "he-utf8.txt", "utf8", "hebrew" ],
    [ "hi", "hi-utf8.txt", "utf8", "hindi" ],
    [ "hr", "hr-utf8.txt", "utf8", "croatian" ],
    #id (indonesian)
    [ "io", "io-utf8.txt", "utf8", "ido" ],
    [ "is", "is-utf8.txt", "utf8", "icelandic" ],
    [ "it", "it-utf8.txt", "utf8", "italian" ],
    [ "ja", "ja-utf8.txt", "utf8", "japanese" ],
    [ "ko", "ko-utf8.txt", "utf8", "korean" ],
    #ku (kurdish)
    #la ?
    #lb ?
    #lt (lithuanian)
    #lv (latvian)
    [ "hu", "hu-utf8.txt", "utf8", "hungarian" ],
    #mk (macedonian)
    #ms (malay)
    #my (burmese)
    [ "nl", "nl-iso-8859-1.txt", "iso-8859-1", "dutch" ],
    [ "no", "no-utf8.txt", "utf8", "norwegian" ],
    [ "pl", "pl-utf8.txt", "utf8", "polish" ],
    [ "pt", "pt-utf8.txt", "utf8", "portuguese" ],
    [ "ro", "ro-utf8.txt", "utf8", "romanian" ],
    [ "ru", "ru-utf8.txt", "utf8", "russian" ],
    [ "sl", "sl-utf8.txt", "utf8", "slovenian" ],
    #sr (serbian)
    [ "sv", "sv-iso-8859-1.txt", "iso-8859-1", "swedish" ],
    #[ "sv", "sv-utf8.txt", "utf8", "swedish" ],
    [ "th", "th-utf8.txt", "utf8", "thai" ],
    #tl (tagalog)
    #ty (tahitian)
    [ "uk", "uk-utf8.txt", "utf8", "ukraninan" ],
    [ "vi", "vi-utf8.txt", "utf8", "vietnamese" ],
    #wa (walloon)
    #yi (yidisih)
    [ "zh", "zh-utf8.txt", "utf8", "chinese" ]
  ]

  profiles = []
  training_data.each {|data| 
    p = Profile.new data[0]
    p.init_with_file data[1]
    profiles << p
  }
  puts 'saving model...'
  filename = File.expand_path(File.join(File.dirname(__FILE__), "model.yml"))
  File.open(filename, 'w') {|f|
    YAML.dump(profiles, f)
  }
end

Instance Method Details

#detect(text) ⇒ Object 



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# File 'lib/language_detector.rb', line 2

def detect text
  @profiles ||= load_model

  p = Profile.new("")
  p.init_with_string text
  best_profile = nil
  best_distance = nil
  @profiles.each {|profile|
    distance = profile.compute_distance(p)
    
    if !best_distance || distance < best_distance
      best_distance = distance
      best_profile = profile
    end
  }
  return best_profile.name
end

#load_model ⇒ Object 



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# File 'lib/language_detector.rb', line 107

def load_model
  filename = File.expand_path(File.join(File.dirname(__FILE__), "model.yml"))
  @profiles = YAML.load_file(filename)
end