ex41.rb

require 'open-uri'
WORD_URL = "http://learncodethehardway.org/words.txt"
WORDS=[]
PHRASES={
  "class ### < ###\nend" => "Make a class named ### that is-a ###.",
  "class ###\n\tdef initialize(@@@)\n\tend\nend"  => "class ### has-a initialize that takes @@@ parameters.",
  "class ###\n\tdef ***(@@@)\n\tend\nend" => "class ### has-a function named *** that takes @@@ parameters.",
  "*** = ###.new()"  => "Set *** to an instance of class ###.",
  "***.***(@@@)"  => "From *** get the *** function, and call it with parameters @@@.",
  "***.*** = '***'" => "From *** get the *** attribute and set it to '***'."
}

PHRASE_FIRST=ARGV[0]=="english"

open(WORD_URL) { |f|
  f.each_line { |word|  WORDS.push (word.chomp) 
 }    
  }
#puts WORDS
snippet=["class ### < ###\nend",  "class ###\n\tdef initialize(@@@)\n\tend\nend",
        "class ###\n\tdef ***(@@@)\n\tend\nend"]
# for i in [snippet, PHRASES]
#   puts "#{i}\n" 
# end



def craft_names(rand_words, snippet, pattern, caps=false)
  names=snippet.scan(pattern).map do
    word=rand_words.pop()
    caps ? word.capitalize : word    
  end
  return names * 2
end

def craft_params (rand_words, snippet, pattern)
  names=(0...snippet.scan(pattern).length). map do
    param_count = rand(3)+1
    params =(0...param_count).map {|x| rand_words.pop()}
    params.join()
  end
  return names *2
end

def convert (snippet, phrase)
  rand_words=WORDS.sort_by {rand}
  class_names=craft_names(rand_words, snippet, /###/, caps=true)
  other_names=craft_names(rand_words, snippet, /\*\*\*/, )
  param_names=craft_names(rand_words, snippet, /@@@/)

  results=[]
for sentence in [snippet, phrase]
    #
    result = sentence.gsub(/###/) {|x| class_names.pop }

   
    result.gsub!(/\*\*\*/) {|x| other_names.pop }

    result.gsub!(/@@@/) {|x| param_names.pop }

    results.push(result)
  end

  return results
end 
 
loop do
  snippets = PHRASES.keys().sort_by {rand}

  for snippet in snippets
    phrase = PHRASES[snippet]
    question, answer = convert(snippet, phrase)

    if PHRASE_FIRST
      question, answer = answer, question
    end

    print question, "\n\n> "

    exit(0) unless STDIN.gets

    puts "\nANSWER:  %s\n\n" % answer
  end
end