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|
package fsm
import (
"fmt"
"os"
"os/exec"
"path"
"sort"
)
type (
FSMStateID int8
FSMStateIDSlice []FSMStateID
)
func (v FSMStateIDSlice) Len() int {
return len(v)
}
func (v FSMStateIDSlice) Less(i, j int) bool {
return v[i] < v[j]
}
func (v FSMStateIDSlice) Swap(i, j int) {
v[i], v[j] = v[j], v[i]
}
type FSMTransition struct {
To FSMStateID
Description string
}
type (
FSMStates map[FSMStateID]FSMState
)
type FSMState struct {
Transitions []FSMTransition
// Which state to go back to on a back transition
BackState FSMStateID
}
type FSM struct {
States FSMStates
Current FSMStateID
// Info to be passed from the parent state
Name string
StateCallback func(FSMStateID, FSMStateID, interface{})
Directory string
Debug bool
GetName func(FSMStateID) string
}
func (fsm *FSM) Init(
current FSMStateID,
states map[FSMStateID]FSMState,
callback func(FSMStateID, FSMStateID, interface{}),
directory string,
nameGen func(FSMStateID) string,
debug bool,
) {
fsm.States = states
fsm.Current = current
fsm.StateCallback = callback
fsm.Directory = directory
fsm.GetName = nameGen
fsm.Debug = debug
}
func (fsm *FSM) InState(check FSMStateID) bool {
return check == fsm.Current
}
func (fsm *FSM) HasTransition(check FSMStateID) bool {
for _, transition_state := range fsm.States[fsm.Current].Transitions {
if transition_state.To == check {
return true
}
}
return false
}
func (fsm *FSM) getGraphFilename(extension string) string {
debugPath := path.Join(fsm.Directory, "graph")
return fmt.Sprintf("%s%s", debugPath, extension)
}
func (fsm *FSM) writeGraph() {
graph := fsm.GenerateGraph()
graphFile := fsm.getGraphFilename(".graph")
graphImgFile := fsm.getGraphFilename(".png")
f, err := os.Create(graphFile)
if err != nil {
return
}
_, writeErr := f.WriteString(graph)
f.Close()
if writeErr != nil {
cmd := exec.Command("mmdc", "-i", graphFile, "-o", graphImgFile, "--scale", "4")
// Generating is best effort
_ = cmd.Start()
}
}
func (fsm *FSM) GoBack() {
fsm.GoTransition(fsm.States[fsm.Current].BackState)
}
func (fsm *FSM) GoTransitionWithData(newState FSMStateID, data interface{}) bool {
ok := fsm.HasTransition(newState)
if ok {
oldState := fsm.Current
fsm.Current = newState
if fsm.Debug {
fsm.writeGraph()
}
fsm.StateCallback(oldState, newState, data)
}
return ok
}
func (fsm *FSM) GoTransition(newState FSMStateID) bool {
return fsm.GoTransitionWithData(newState, "{}")
}
func (fsm *FSM) generateMermaidGraph() string {
graph := "graph TD\n"
sorted_fsm := make(FSMStateIDSlice, 0, len(fsm.States))
for state_id := range fsm.States {
sorted_fsm = append(sorted_fsm, state_id)
}
sort.Sort(sorted_fsm)
for _, state := range sorted_fsm {
transitions := fsm.States[state].Transitions
for _, transition := range transitions {
if state == fsm.Current {
graph += "\nstyle " + fsm.GetName(state) + " fill:cyan\n"
} else {
graph += "\nstyle " + fsm.GetName(state) + " fill:white\n"
}
graph += fsm.GetName(
state,
) + "(" + fsm.GetName(
state,
) + ") " + "-->|" + transition.Description + "| " + fsm.GetName(
transition.To,
) + "\n"
}
}
return graph
}
func (fsm *FSM) GenerateGraph() string {
if fsm.GetName != nil {
return fsm.generateMermaidGraph()
}
return ""
}
|
