class SassListen::FSM::State

def call(obj)
  obj.instance_eval(&@block) if @block
end

def initialize(name, transitions = nil, &block)
  @name, @block = name, block
  @transitions = nil
  @transitions = Array(transitions).map(&:to_sym) if transitions
end

def valid_transition?(new_state)
  # All transitions are allowed unless expressly
  return true unless @transitions
  @transitions.include? new_state.to_sym
end