Class: Set::Combination

Inherits:
Set
  • Object
show all
Defined in:
lib/set/combination/version.rb,
lib/set/combination.rb

Constant Summary collapse

VERSION = 
"0.0.1"
InvalidDimentionError = 
Class.new(StandardError)

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(*dimentions) ⇒ Combination

Returns a new instance of Combination.



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# File 'lib/set/combination.rb', line 11

def initialize *dimentions
  @dimentions = dimentions.clone

  unless dimentions.all?{|dimention| dimention.respond_to? :to_a }
    raise Set::Combination::InvalidDimentionError.new "all dimentions must respond to to_a"
  end

  members = dimentions.map(&:to_a).flatten
  if members != members.uniq
    raise Set::Combination::InvalidDimentionError.new "all members in a combination must be uniq"
  end

  combinations = dimentions.shift.to_a.map{|v| Set[v] }.to_set
  combinations = dimentions.inject(combinations){ |combinations, dimention|
    combinations.inject([]){|new_combinations, combination|
      (new_combinations + dimention.to_a.map{ |member| combination + Set[member] }).to_set
    }
  }
  super combinations
end

Instance Attribute Details

#dimentions ⇒ Object (readonly)

Returns the value of attribute dimentions.



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# File 'lib/set/combination.rb', line 32

def dimentions
  @dimentions
end

Instance Method Details

#*(dimention) ⇒ Object 



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# File 'lib/set/combination.rb', line 34

def * dimention
  dimentions = dimention.respond_to?(:dimentions) ? dimention.dimentions : [dimention]
  self.class.new *(self.dimentions + dimentions)
end

#inspect ⇒ Object 



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# File 'lib/set/combination.rb', line 39

def inspect
  %(#<#{self.class} #{to_a.map(&:inspect)*', '}>)
end