DFA

abstract def run(r: Registers): Unit

Runs the DFA.
Runs the DFA. Terminates when some state has an action that transitions to the final state.
Results are "returned" by way of side-effecting the dfaStatus member of the Registers object. The results convey that we've either Failed, Succeeded, encountered EndOfData or we need to Pause and make a determination of what follows us before we can continue. It's needed because of this whole idea of 'pausing' and 'resuming' for back tracking.
abstract def states: Array[State]

The state machine is an array of states.
The state machine is an array of states. So each State has a distinguished index. 0 is reserved for the final state.

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final def notify(): Unit

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final def runLoop(r: Registers, terminateLoopOnState: Int, finalStatus: StateKind): Unit

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