add (
        self,
        s,
        v,
        )

Add a string pattern and a value to return if that pattern is matched.

apply ( self,  tok )

If applying tok results in an acceptance, return the accept value. If rejected, raise a ValueError. Else return None (internal state is preserved across multiple calls to apply).

reset ( self )

Move the state machine back into the start state.

state ( self )

Returns the current state of the state machine.