# This class is used to contain a single +screen+ element (an instance of Hpricot::Elem) as well as any variable
# assignments that have been made. Basically, it is simply used by +Rtml::ReverseEngineering::Simulator+ to check
# for circular pathways. If two identical snapshots would be created, then it stands to reason that the resultant
# pathways for those two snapshots will also be identical. If you're following a path and creating snapshots at every
# step of the way, and two snapshots match, then using that logic, those two snapshots would indicate a circular
# pathway. (It comes down to either that, or waiting to catch a stack overflow error, which is less than optimal.)
#
class Rtml::ReverseEngineering::Simulator::Snapshot
  attr_reader :screen, :variables

  def initialize(screen, variables)
    @screen, @variables = screen, variables.dup
  end

  def ==(other_snapshot)
    @screen == other_snapshot.screen && variables == other_snapshot.variables
  end
end