Class: Bridge::Card

Inherits:
Object
  • Object
show all
Includes:
Comparable
Defined in:
lib/bridge/card.rb

Constant Summary collapse

RANKS = 
%w(2 3 4 5 6 7 8 9 10 J Q K A)
SUITS = 
%w(C D H S)

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(rank, suit) ⇒ Card

Returns a new instance of Card.



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# File 'lib/bridge/card.rb', line 10

def initialize(rank, suit)
  raise CardError.new "'#{rank}' is not a card rank" unless RANKS.include?(rank)
  raise CardError.new "'#{suit}' is not a card suit" unless SUITS.include?(suit)
  @rank = rank
  @suit = suit
end

Instance Attribute Details

#rank ⇒ Object (readonly)

Returns the value of attribute rank.



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# File 'lib/bridge/card.rb', line 16

def rank
  @rank
end

#suit ⇒ Object (readonly)

Returns the value of attribute suit.



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# File 'lib/bridge/card.rb', line 16

def suit
  @suit
end

Class Method Details

.from_string(string) ⇒ Object

Raises:



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# File 'lib/bridge/card.rb', line 47

def self.from_string string
  raise CardError.new, "'#{string}' is not a card" if string.size < 2
  suit = string[string.size-1]
  rank = string.chop
  new(rank.upcase, suit.upcase)
end

Instance Method Details

#<=>(other) ⇒ Object 



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# File 'lib/bridge/card.rb', line 18

def <=>(other)
  # this ordering sorts first by rank, then by suit
  (Card::SUITS.find_index(self.suit) <=> Card::SUITS.find_index(other.suit)).nonzero? or
    (Card::RANKS.find_index(self.rank) <=> Card::RANKS.find_index(other.rank))
end

#honour ⇒ Object 



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# File 'lib/bridge/card.rb', line 28

def honour
  case rank
  when 'J'
    1
  when 'Q'
    2
  when 'K'
    3
  when 'A'
    4
  else
    0
  end
end

#suit_i ⇒ Object 



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# File 'lib/bridge/card.rb', line 43

def suit_i
  SUITS.index(suit)
end

#to_s ⇒ Object 



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# File 'lib/bridge/card.rb', line 24

def to_s
  @rank + @suit
end