Class: Word

Inherits:
ActiveRecord::Base
  • Object
show all
Defined in:
app/models/word.rb

Constant Summary collapse

@@insig_words = 
{}

Class Method Summary collapse

Class Method Details

.frequency(text, options = {}) ⇒ Object 



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# File 'app/models/word.rb', line 12

def Word.frequency(text, options = {})

  t = text.downcase.gsub(/[^a-z\']/, ' ')
 
  stem = options[:stem] || false
  exclude_insig_words = options[:exclude_insig_words] || true
  excludes = options[:excludes] 
  exclude_matches_stems = options[:exclude_matches_stems] || true

  words = {}
  t.split(' ').each do |w|
    next if exclude_insig_words && @@insig_words[w]
    next if excludes && excludes[w]
    ww = stem ? Lingua.stemmer(w) : w
    next if excludes && excludes[ww] && exclude_matches_stems
    next if exclude_insig_words && @@insig_words[ww] && exclude_matches_stems
    words[ww] ||= 0
    words[ww] += 1
  end

  if options[:de_stem]
    t.split(' ').each do |w|
      ww = Lingua.stemmer(w)
      words[w] = words[ww] if words[ww]
      words.delete(ww)
    end

  end
 return words 
end

.histogram(text, options) ⇒ Object 



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# File 'app/models/word.rb', line 43

def Word.histogram(text, options) 
  f = Word.frequency(text, options)
   
  threshold = options[:threshold]
  max = options[:max]
  r = []  
  f.sort {|a,b| a[1]<=>b[1]}.reverse.collect do |k,v| 
    break if max && r.size>=max
    if threshold==nil || v >= threshold
      r << [ k, v ]
    end
  end
  
  return r
end