modified

webpage.rb

# Ruby 2.3.1
class WebPageRank 
  MAX_WEIGHT = 8

  def initialize
    # read input from file
    @file = File.read('input.txt')
  end

  def process_input_file
    input_array =  @file.split(/\n+/)
    @query_index = 0
    @page_index = 0
    @page_hash = {}
    @query_result_hash = {}
    input_array.each_with_index do |input|
      input.downcase!
      next if input.strip.empty?
      if input.start_with? 'p'
        process_page_input(input)
      else
        process_query_input(input)
      end
    end
    display_rank_result
   end

  def process_page_input(page_input)
    @page_hash[page_name] = make_weighted_keyword_hash(page_input)
  end

  def process_query_input(query_input)
    @query_result_hash[query_name] = calculate_page_weight(query_input)
  end

  def calculate_page_weight(query_input)
    weighted_hash = make_weighted_keyword_hash(query_input)
    query_hash = {}
    @page_hash.each do |_key, value|
      query_hash[_key] = calaculate_page_weight(value, weighted_hash)
    end
    query_hash
  end

  def display_rank_result
    @query_result_hash.each do |key, value|
      puts "#{key} : #{sorted_page_array(value)}"
    end
  end

  private

  def calaculate_page_weight(value, weighted_hash)
    weighted_hash.map { |_key, weight| value.key?(_key) ? value[_key] * weight : 0 }.reduce(:+)
  end

  def make_weighted_keyword_hash(input)
    input.split(' ').drop(1).each_with_index.map { |key, index| [key, MAX_WEIGHT - index] }.to_h
  end

  def query_name
    @query_index+=1
    ('Q' + @query_index.to_s).to_sym
  end

  def page_name
    @page_index+=1
    ('P' + @page_index.to_s).to_sym
  end

  def sorted_page_array(page_hash)
    page_hash.sort_by { |_, value| value * -1 }.to_h.select { |_, value| value > 0 }.keys.join(' ')
  end

end

w = WebPageRank.new
w.process_input_file