concordance.rb

#The output is as follows:
# word followed by "total: " with the total amount next to it
# 2:1 The sentence that the word appears in and the number of times it appears.
# 2:1 means that the word appears in the second sentence one time.

class Concordance

  shash = Array.new
  total_hash = Hash.new

  def self.sent_totals(shash, key)
    out = " "
    total = 0
    shash.each_with_index do |sha,idx|
      out << "#{idx+1}:#{sha[key]}," if sha.has_key? key
      total += sha[key]
    end
    out_arr = [out.chomp(","), total]
  end

  in_text = "Given an arbitrary text document written in English, write a program that will generate a concordance, i.e. an alphabetical list of all word occurrences, labeled with word frequencies.  Bonus: label each word with the sentence numbers in which each occurrence appeared."
  sentence_list = in_text.downcase.split(/\.  |\?  |\!  |\; /)
  sentence_hash = sentence_list.each_with_index do |sentence,idx|
    shash[idx] = sentence.split(" ").reduce(Hash.new(0)) { |h, w| h.update(w => h[w] + 1) }
    total_hash = total_hash.merge shash[idx]
  end

  total_hash.sort.each do |k,v|
    out =  sent_totals(shash, k)
    puts "#{k}     total: #{out[1]}  #{out[0]}"
  end
end