module StateMachine::MatcherHelpers

Represents a state that matches all known states in a machine.

Examples¶ ↑

class Vehicle
  state_machine do
    before_transition any => :parked, :do => lambda {...}
    before_transition all - :parked => all - :idling, :do => lambda {}

    event :park
      transition all => :parked
    end

    event :crash
      transition all - :parked => :stalled
    end
  end
end

In the above example, all will match the following states since they are known:

• parked

• stalled

• idling

   # File lib/state_machine/matcher_helpers.rb
28 def all
29   AllMatcher.instance
30 end

Represents a state that matches the original from state. This is useful for defining transitions which are loopbacks.

Examples¶ ↑

class Vehicle
  state_machine do
    event :ignite
      transition [:idling, :first_gear] => same
    end
  end
end

In the above example, same will match whichever the from state is. In the case of the ignite event, it is essential the same as the following:

transition :parked => :parked, :first_gear => :first_gear

   # File lib/state_machine/matcher_helpers.rb
50 def same
51   LoopbackMatcher.instance
52 end