68 lines
1.5 KiB
Go
68 lines
1.5 KiB
Go
// Copyright 2024 Matthew Rich <matthewrich.conf@gmail.com>. All rights reserved.
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package machine
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import (
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"errors"
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)
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type State string
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type Stater interface {
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AddStates(name ...State)
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GetState(name string) State
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AddTransition(trigger string, source State, dest State)
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AddSubscription(transition string, subscription Subscriber) error
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AddModel(m Modeler)
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Trigger(transition string) error
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CurrentState() State
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}
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type Definition struct {
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states []State
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triggers map[string]Transitioner
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model Modeler
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}
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func New(initial State) Stater {
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return &Definition{model: NewModel(initial), triggers: make(map[string]Transitioner)}
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}
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func (d *Definition) AddStates(name ...State) {
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d.states = append(d.states, name...)
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}
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func (d *Definition) AddTransition(trigger string, source State, dest State) {
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d.triggers[trigger] = NewTransition(trigger, source, dest)
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}
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func (d *Definition) GetState(name string) State {
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var r State
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for _, s := range d.states {
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if string(s) == name {
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return s
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}
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}
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return r
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}
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func (d *Definition) AddModel(m Modeler) {
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d.model = m
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}
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func (d *Definition) Trigger(transition string) error {
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return d.triggers[transition].Run(d.model)
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}
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func (d *Definition) CurrentState() State {
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return d.model.InspectState()
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}
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func (d *Definition) AddSubscription(transition string, subscription Subscriber) error {
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if t, ok := d.triggers[transition]; ok {
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t.Subscribe(subscription)
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return nil
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}
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return errors.New("Transition does not exist")
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}
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