forked from ungerik/go-start
-
Notifications
You must be signed in to change notification settings - Fork 0
/
statemachine.go
69 lines (50 loc) · 1.2 KB
/
statemachine.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
// A state machine - not ready yet.
package states
type StateMachine struct {
name string
States []State
Transitions []*Transition
currentState State
parent *StateMachine
}
func (self *StateMachine) SetStateMachine(parent *StateMachine) {
self.parent = parent
}
func (self *StateMachine) StateMachine() *StateMachine {
return self.parent
}
func (self *StateMachine) Name() string {
return self.name
}
func (self *StateMachine) Enter(transition *Transition) {
if self.currentState != nil {
panic("Current state machine already entered")
}
transition = &Transition{}
for _, state := range self.States {
transition.To = state
if !transition.Veto() {
transition.Do()
return
}
}
transition.From = self
transition.To = nil
transition.Do()
}
func (self *StateMachine) Leave(transition *Transition) {
}
func (self *StateMachine) CurrentState() State {
return self.currentState
}
func (self *StateMachine) Event(event string) {
if self.currentState == nil {
panic("State machine can't handle event because it's not active")
}
for _, tr := range self.Transitions {
if tr.From == self.currentState && tr.Event == event && !tr.Veto() {
tr.Do()
return
}
}
}