Contents

%w[options errors machine state transition executable builder].each do |item|
  require File.join(File.dirname(__FILE__), 'fsm', item)
end

module FSM
  module ClassMethods
    def define_fsm(&block)
      raise 'FSM is already defined. Call define_fsm only once' if Machine[self]
      builder = Builder.new(self)
      Machine[self] = builder.process(&block)
      self.instance_eval() do 
        alias_method "fsm_state_attribute", Machine[self].current_state_attribute_name
        define_method(Machine[self].current_state_attribute_name) do
          value = fsm_state_attribute
          value ? value : Machine[self.class].initial_state_name
        end
      end
    end
    
    def dot(options = {})
      machine = Machine[self]
      raise 'No FSM defined. Call define_fsm first' unless machine
      machine.dot(options)
    end
    
  end
  
  module InstanceMethods
    #
    # Which states are reachable from the current state
    def reachable_state_names
      Machine[self.class].reachable_states(self).map() {|item| item.name}
    end
    
    def available_transition_names
      Machine[self.class].available_transitions(self).map() {|item| item.name}
    end
  end
  
  def self.included(receiver)
    receiver.class_eval do 
      extend(ClassMethods)
      include(InstanceMethods)
    end
  end  
  
end

Version data entries

1 entries across 1 versions & 1 rubygems

Version	Path
simplificator-fsm-0.2.4	lib/fsm.rb