turnstile

package

v0.1.2 Latest Latest Go to latest Published: Nov 12, 2026 License: Apache-2.0 Imports: 1 Imported by: 0

Details

Package turnstile is the smallest machine merilo checks: one mode, no actions, so Fire returns only the next machine and the outcome.

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type Event uint8

Event is an input to Fire.

const (
	EvCoin Event
	EvPush
)

Event values.

type Machine struct {
	// contains filtered or unexported fields
}

Machine is one turnstile. Build it with New and change it only with Fire.

func New() Machine

New returns a locked turnstile.

func (m Machine) Fire(e Event) (Machine, fsm.Outcome)

Fire applies e: a coin unlocks, a push through an unlocked turnstile locks it again, and a push on a locked one is rejected.

func (m Machine) State() State

State returns the control state.

type State uint8

State is the turnstile's control state.

const (
	Locked State
	Unlocked
)

State values. The zero value is an unexported sentinel.

func (s State) String() string