state_machine

class StateMachine < Object

A simple state machine.

  sm = State_Machine.new(
      {
        :ALPHA => {
          :A => :ALPHA,
          :B => :BETA
        },
        :BETA => {
          :A => :ALPHA
        }
      },
      :ALPHA
  )
  sm.change_state(:A)
  sm.change_state(:B)

Note that you are not limited to using symbols as your states and inputs; you may use any object type you wish (RubyCollections Enums work well).

class InvalidInput < Exception

Public Methods

state

initialize(states, initial_state)

Create a new state machine.

states	a hash: { current_state => { input => new_state } }
initial	state the initial state

change_state(input)

Change state to whichever state is associated with the given input.

draw(orientation, file, *args)

Write a picture of the state machine to a file, using GraphR.

orientation	a string, 'portrait' or 'landscape'.
file	the name of the file to write to.
args	any additional arguments you wish to pass to write_to_file.

class RecordKeepingStateMachine < StateMachine

A special type of state machine that keeps a history of all inputs and states.

Public Methods

state_history

input_history

initialize(states, initial_state)

change_state(input)

Requires