class Diff::LCS::ContextChange

taken.
elements in the old and the new sequenced enumerables as well as the action
Represents a contextual change. Contains the position and values of the

def self.from_a(arr) 

def self.from_a(arr)
  Diff::LCS::Change.from_a(arr)
end

def self.simplify(event)

are converted to '-' and '>' actions are converted to '+'.
Simplifies a context change for use in some diff callbacks. '<' actions 
def self.simplify(event)
  ea = event.to_a
  case ea[0]
  when "-"
    ea[2][1] = nil
  when "<"
    ea[0] = "-"
    ea[2][1] = nil
  when "+"
    ea[1][1] = nil
  when ">"
    ea[0] = "+"
    ea[1][1] = nil
  end
  Diff::LCS::ContextChange.from_a(ea)
end

def <=>(other) 

def <=>(other)
  r = @action <=> other.action
  r = @old_position <=> other.old_position if r.zero?
  r = @new_position <=> other.new_position if r.zero?
  r = @old_element <=> other.old_element if r.zero?
  r = @new_element <=> other.new_element if r.zero?
  r
end

def ==(other) 

def ==(other)
  (self.class == other.class) and
    (@action == other.action) and
    (@old_position == other.old_position) and
    (@new_position == other.new_position) and
    (@old_element == other.old_element) and
    (@new_element == other.new_element)
end

def initialize(*args) 

def initialize(*args)
  @action, @old_position, @old_element, @new_position, @new_element = *args
  fail "Invalid Change Action '#{@action}'" unless Diff::LCS::Change.valid_action?(@action)
  fail "Invalid (Old) Position Type" unless @old_position.nil? || @old_position.is_a?(IntClass)
  fail "Invalid (New) Position Type" unless @new_position.nil? || @new_position.is_a?(IntClass)
end

def to_a 

def to_a
  [
    @action,
    [@old_position, @old_element],
    [@new_position, @new_element]
  ]
end