Class: Rundown::Processors::ReadingGrade

Inherits:
Rundown::Processor show all
Defined in:
lib/rundown/processors/reading_grade.rb

Constant Summary

Constants inherited from Rundown::Processor

Rundown::Processor::PUNCTUATION

Instance Attribute Summary

Attributes inherited from Rundown::Processor

#text

Class Method Summary collapse

Instance Method Summary collapse

Methods inherited from Rundown::Processor

#initialize, #sentences

Constructor Details

This class inherits a constructor from Rundown::Processor

Class Method Details

.known_words ⇒ Object 



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# File 'lib/rundown/processors/reading_grade.rb', line 16

def self.known_words
  @known_words ||= File.readlines(File.expand_path('../../../../data/known_words.txt', __FILE__)).map(&:chomp)
end

Instance Method Details

#average_sentence_length ⇒ Object 



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# File 'lib/rundown/processors/reading_grade.rb', line 32

def average_sentence_length
  sen = sentences.map {|s| words_for(s).length }
  sen.reduce(:+).to_f / sen.size
end

#difficult_words ⇒ Object 



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# File 'lib/rundown/processors/reading_grade.rb', line 8

def difficult_words
  @difficult_words ||= (words_without_nouns.uniq.map(&:downcase) - known_words.map(&:downcase)).reject {|w| w.length < 5 }
end

#grade ⇒ Object

4.9 and Below Grade 4 and Below 5.0 to 5.9 Grades 5 - 6 6.0 to 6.9 Grades 7 - 8 7.0 to 7.9 Grades 9 - 10 8.0 to 8.9 Grades 11 - 12 9.0 to 9.9 Grades 13 - 15 (College) 10 and Above Grades 16 and Above (College Graduate)



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# File 'lib/rundown/processors/reading_grade.rb', line 50

def grade
  @grades ||= case score
    when 10.0..100.0
      16
    when 9.0..10.0
      13
    when 8.5..9.0
      12
    when 8.0..8.5
      11
    when 7.5..8.0
      10
    when 7.0..7.5
      9
    when 6.5..7.0
      8
    when 6.0..6.5
      7
    when 5.5..6.0
      6
    when 5.0..5.5
      5
    else
      4
  end
end

#known_words ⇒ Object 



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# File 'lib/rundown/processors/reading_grade.rb', line 12

def known_words
  self.class.known_words
end

#percent_difficult_words ⇒ Object 



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# File 'lib/rundown/processors/reading_grade.rb', line 4

def percent_difficult_words
  (difficult_words.length.to_f / words.length.to_f) * 100
end

#process ⇒ Object 



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# File 'lib/rundown/processors/reading_grade.rb', line 77

def process
  grade
end

#score ⇒ Object

en.wikipedia.org/wiki/Dale%E2%80%93Chall_readability_formula



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# File 'lib/rundown/processors/reading_grade.rb', line 38

def score
  raw_score = (0.1579 * (percent_difficult_words)) + (0.0496 * average_sentence_length)
  percent_difficult_words > 5.0 ? raw_score + 3.6365 : raw_score
end

#words ⇒ Object 



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# File 'lib/rundown/processors/reading_grade.rb', line 20

def words
  text.split(/[^a-zA-Z']+/)
end

#words_for(sentence) ⇒ Object 



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# File 'lib/rundown/processors/reading_grade.rb', line 28

def words_for(sentence)
  sentence.split(/[^a-zA-Z']+/)
end

#words_without_nouns ⇒ Object 



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# File 'lib/rundown/processors/reading_grade.rb', line 24

def words_without_nouns
  words.reject { |w| w[0].upcase == w[0] }
end