SQUARISM addicted to pixels

require 'test/unit'
require 'reverser'
 
  # Be wary of newlines in the test and expected trings.
  # Do not try to word wrap with escapes.  It's very picky.
class TestReverser < Test::Unit::TestCase
  # Optional
  #def setup
  #end
 
  def teardown
    if @test_passed then
      puts "\n #{@r.reverse}"  # more verbose for successful passes
      puts "#{@method_name.upcase} OK.\n\n"
    else
      puts "#{@method_name.upcase} FAIL.\n\n"
    end
  end
 
  # simple test
  def test_reverser
    test = "You space bastard.  You killed my pine."
    expected = "Bastard space you.  Pine my killed you."
    @r = Reverser.new(test)
    assert_equal(expected, @r.reverse, "Fail.")        
  end
 
  # Test multiple sentence delimiters  
  def test_multiple_sentence_delimiters
    test = "Shape up, man.  You're a slacker.  Do you want to be a slacker for the rest of your life?"
    expected = "Man, up shape.  Slacker a you're.  Life your of rest the for slacker a be to want you do?"
    @r = Reverser.new(test)
    assert_equal(expected, @r.reverse, "Fail.")
  end
 
  # Test no periods, question mark and commas
  def test_question_comma
    test = "Then tell me, future boy, huh, who's president of the United States in 1985?"
    expected = "1985 in States United the of president who's, huh, boy future, me tell then?"
    @r = Reverser.new(test)
    assert_equal(expected, @r.reverse, "Fail.")
  end
 
  # Big test  
  def test_everything
    test = "Our first television set. Dad just picked it up today. Do you have a television? Well, yeah, you know, we have two of them. Wow! You must be rich. Oh, honey, he's teasing you. Nobody has two television sets."
    expected = "Set television first our.  Today up it picked just dad.  Television a have you do?  Them of two have we, know you, yeah, well.  Wow!  Rich be must you.  You teasing he's, honey, oh.  Sets television two has nobody."
    @r = Reverser.new(test)
    assert_equal(expected, @r.reverse, "Fail.")
  end
 
end

# A class that reverses sentences.
# "My dog has fleas." --> "Fleas has dog my."
 
class Reverser
 
  # tasty constructor, full of taste
  def initialize(text)
    @text = text
  end
 
  def reverse
    delim_location = 0  # char by char, remember !?. for sentence determination
    delim_last_location = 0  # allows us to move on to the next sentence
    delim_i = 0  # an iterator
 
    new_sentence = ""  # inits an empty string for string methods to work
 
    new_sentence_array = Array.new
    punc_array = Array.new  # list of punctuation marks in order
    @text.each_char do |char|
      delim_i += 1  # iterator
      if (char == "." || char == "?" || char == "!")
        # we hit a deliminter (?!.), remember it
        sentence = @text.slice(delim_last_location..delim_i) 
        sentence.strip!
        new_sentence_array.push(sentence)
        punc_array.push(char)             
        delim_last_location = delim_i  # remember our substring position
      end
    end
 
    i = 0
    new_sentence_array.each do |s|
        returned_sentence = do_reverse(s)  # reverse words sentence by sentence
        new_sentence += "#{returned_sentence}#{punc_array[i]}"  # append the delimiter back
 
        if (i+1 != new_sentence_array.length)  # look ahead for last sentence
          new_sentence += "  "  # only append spaces if this is not the last sentence
        end
        i += 1
 
    end
 
 
    new_sentence  # return new_sentence
 
  end
 
  def do_reverse(s)
    s.chop!  # trim delimiter
    text_array = s.split(" ")  # split on spaces to array
    text_array[0].downcase!  # downcase first word
    text_array.reverse!  # destructive reverse
 
    # need to move commas back
    text_array_i = 0
    text_array.each do |e|
       text_array_i += 1
        if e.include? ","
          e.chop!   # modify original array
          text_array[text_array_i - 2] += ","
        end
    end
 
    text_array[0].capitalize!
    text_array = text_array.join(" ")  # destructive join
    text_array.to_s  # return reversed array
  end
 
end