A Rubyclass to get some cards

play_cards.rb

  # encoding: utf-8

  class Cards
    def initialize(*signs)
      @colors = [:♥, :♠, :♦, :♣]
      @valid_signs = [2, 3, 4, 5, 6, 7, 8, 9, 10, :J, :Q, :K, :A]
      if signs.empty? then
        signs = @valid_signs
      end
      signs.each { |s|
        raise "Given Sign \"#{ s }\" is not valid" unless @valid_signs.include?(s)
      }
      @signs = signs.sort { |a,b| @valid_signs.index(a) <=> @valid_signs.index(b) }

      @card = Struct.new(:color, :sign) do
        class << self
          attr_accessor :colors, :signs
        end
        def show
          "\{#{ sign }#{ color } \}"
        end
        def compare(other)
          num = Proc.new { |a| self.class.signs.index(a.sign) }
          col = Proc.new { |a| self.class.colors.reverse.index(a.color) }
          num_compare = num.call(self) <=> num.call(other)
          if num_compare == 0 then
            return col.call(self) <=> col.call(other)
          else
            return num_compare
          end
        end
        def <=>(other)
          getVal = Proc.new { |card| (self.class.colors.index(card.color)*self.class.signs.length) + self.class.signs.index(card.sign) }
          getVal.call(self) <=> getVal.call(other)
        end
      end
      @card.colors = @colors
      @card.signs = @signs

      @cards = (@colors.product @signs).collect { |c| @card.new(*c) }
    end
    attr_reader :colors, :signs, :valid_signs, :cards
    def count
      @cards.count
    end
    def get(n=1)
      @cards.pop(n)
    end
    def put(card, pos=0)
      if valid_card? card then
        # unshift
        @cards.insert(pos, card)
        return true
      else
        return false
      end
    end
    def <<(cards)
      cards.each { |c| raise "#{ c } is not a valid card" unless valid_card?(c) }
      @cards.unshift(*cards)
    end
    def mix
      @cards.shuffle!
    end
    def sort
      @cards.sort!
    end
    private
    def valid_card?(card)
      return false unless card.is_a? @card
      return false unless @colors.include? card.color
      return false unless @signs.include? card.sign
      return true
    end
  end