Sha256: 75aeb0d622dd5fa6b2b06b060d001f42a56f4c41cf77d2f72bf8750621a6ff1c

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Size: 873 Bytes

Versions: 1

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Stored size: 873 Bytes

Contents

class MicroMachine
  InvalidEvent = Class.new(NoMethodError)

  attr :transitions_for
  attr :state

  def initialize initial_state
    @state = initial_state
    @transitions_for = Hash.new
    @callbacks = Hash.new { |hash, key| hash[key] = [] }
  end

  def on key, &block
    @callbacks[key] << block
  end

  def when(event, transitions)
    transitions_for[event] = transitions
  end

  def trigger event
    if trigger?(event)
      @state = transitions_for[event][@state]
      callbacks = @callbacks[@state] + @callbacks[:any]
      callbacks.each { |callback| callback.call }
      true
    else
      false
    end
  end

  def trigger?(event)
    raise InvalidEvent unless transitions_for.has_key?(event)
    transitions_for[event][state] ? true : false
  end

  def events
    transitions_for.keys
  end

  def ==(some_state)
    state == some_state
  end
end

Version data entries

1 entries across 1 versions & 1 rubygems

Version Path
micromachine-1.0.4 lib/micromachine.rb