94_war: ruby

94_War/ruby/war.rb

@@ -0,0 +1,118 @@
+#!/usr/bin/env ruby
+# reinterpreted from BASIC by stephan.com
+class War
+  class Card
+    class CardError < StandardError; end
+
+    SUITS = %i[spades hearts clubs diamonds].freeze
+    PIPS = %i[ace deuce trey four five six seven eight nine ten jack king queen].freeze
+    CARDS = SUITS.product(PIPS).freeze
+    VALUES = PIPS.zip(1..13).to_h.freeze
+
+    attr_reader :value
+
+    def initialize(suit, pip)
+      @suit = suit
+      @pip = pip
+      raise CardError, 'invalid suit' unless SUITS.include? @suit
+      raise CardError, 'invalid pip' unless PIPS.include? @pip
+
+      @value = VALUES[pip]
+    end
+
+    def <=>(other)
+      @value <=> other.value
+    end
+
+    def >(other)
+      @value > other.value
+    end
+
+    def <(other)
+      @value < other.value
+    end
+
+    def to_s
+      "the #{@pip} of #{@suit}"
+    end
+
+    def self.shuffle
+      CARDS.map { |suit, pip| new(suit, pip) }.shuffle
+    end
+  end
+
+  def initialize
+    @your_score = 0
+    @computer_score = 0
+    @your_deck = Card.shuffle
+    @computer_deck = Card.shuffle
+  end
+
+  def play
+    intro
+
+    loop do
+      puts "\nYou: #{@your_score} Computer: #{@computer_score}"
+      round @your_deck.shift, @computer_deck.shift
+      break if empty?
+
+      puts 'Do you want to continue?'
+      break unless yesno
+    end
+
+    outro
+  end
+
+  private
+
+  def round(your_card, computer_card)
+    puts "You: #{your_card} vs Computer: #{computer_card}"
+    return puts 'Tie. No score change.' if your_card == computer_card
+
+    if computer_card > your_card
+      puts "Computer wins with #{computer_card}"
+      @computer_score += 1
+    else
+      puts "You win with #{your_card}"
+      @your_score += 1
+    end
+  end
+
+  def yesno
+    loop do
+      wants = gets.strip
+      return true if wants.downcase == 'yes'
+      return false if wants.downcase == 'no'
+
+      puts 'Yes or no, please.'
+    end
+  end
+
+  def intro
+    puts 'War'.center(80)
+    puts 'stephan.com'.center(80)
+    puts
+    puts 'This is the card game of war.'
+    puts 'Do you want directions'
+    directions if yesno
+  end
+
+  def directions
+    puts 'The computer gives you and it a \'card\'.  The higher card'
+    puts '(numerically) wins.  The game ends when you choose not to'
+    puts 'continue or when you have finished the pack.'
+    puts
+  end
+
+  def outro
+    puts "We've run out of cards" if empty?
+    puts "Final score:\nYou: #{@your_score}\nComputer: #{@computer_score}"
+    puts 'Thanks for playing!'
+  end
+
+  def empty?
+    @your_deck.empty? || @computer_deck.empty?
+  end
+end
+
+War.new.play