Class: SentiWordNet

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

Constant Summary collapse

@@sentihash = 
{}

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.load_defaults ⇒ Object 



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# File 'lib/sentiwordnet_ruby.rb', line 63

def self.load_defaults
  load_senti_file(File.dirname(__FILE__) + '/SentiWordNet_3.0.0.txt')
end

.load_senti_file(filename) ⇒ Object 



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# File 'lib/sentiwordnet_ruby.rb', line 67

def self.load_senti_file(filename)
word_temp = Hash.new

File.readlines(filename).each do |line|
  data = line.split("\t")
  score = data[2].to_f - data[3].to_f
  words = data[4].split(" ")
  words.each do |w|
    w_n = w.split("#")
    w_n[0] += "#"+data[0]
    index = w_n[1].to_i - 1
    if word_temp.has_key?(w_n[0])
      v = word_temp[w_n[0]]
      if (index > v.size)
        ((v.size)..(index - 1)).each do |i|
          v << 0.0
        end
      end
      v[index] = score
      word_temp[w_n[0]] = v
    else
      v = []
      (0..(index - 1)).each do |i|
        v << 0.0
      end
      v[index] = score
      word_temp[w_n[0]] = v
    end
  end
end

word_temp.keys.each do |k|
  word = k
  v = word_temp[k]
  score = 0.0
  sum = 0.0
  (0..(v.size - 1)).each do |i|
    score += (1.0/(i+1).to_f)* v[i]
  end
  (1..(v.size)).each do |i|
    sum += 1.to_f/i.to_f
  end
  score /= sum
  @@sentihash[word] = score
end
end

Instance Method Details

#get_score(string) ⇒ Object 



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# File 'lib/sentiwordnet_ruby.rb', line 6

def get_score(string)
  sentiment_total = 0.0

  #tokenize the string, also throw away some punctuation
  tokens = tokenize(string)

  tokens.each do |token|

      if @@sentihash[token+"#n"]
        sentiment_total += @@sentihash[token+"#n"]
      end

      if @@sentihash[token+"#a"]
        sentiment_total += @@sentihash[token+"#a"]
       end

      if @@sentihash[token+"#r"]
        sentiment_total += @@sentihash[token+"#r"]
      end

      if @@sentihash[token+"#v"]
        sentiment_total += @@sentihash[token+"#v"]
      end
  end

  sentiment_total
end

#get_sentiment(string) ⇒ Object 



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# File 'lib/sentiwordnet_ruby.rb', line 34

def get_sentiment(string)
  score = get_score(string)

  if (score > 0.75)
    return "very_positive"
  elsif (score > 0.25 && score <= 0.75)
    return "positive"
  elsif (score > 0 && score <= 0.25)
    return "weak_positive"
  elsif (score == 0)
    return "neutral"
  elsif (score < 0 && score >= -0.25)
    return "weak_negative"
  elsif (score < -0.25 && score >= -0.75)
    return "negative"
  elsif (score < -0.75)
    return "very_negative"
  end
end

#tokenize(string) ⇒ Object 



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# File 'lib/sentiwordnet_ruby.rb', line 54

def tokenize string
  fold_case = false
  string.split(/\s+/).map do |token|
    stripped = token.gsub(/[^a-zA-Z0-9\']+/, '')
    fold_case ? stripped.downcase : stripped
  end
end