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graph.go
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graph.go
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package stateless
import (
"context"
"fmt"
"strings"
)
type graph struct {
}
func (g *graph) FormatStateMachine(sm *StateMachine) string {
var sb strings.Builder
sb.WriteString("digraph {\n\tcompound=true;\n\tnode [shape=Mrecord];\n\trankdir=\"LR\";\n\n")
for _, sr := range sm.stateConfig {
if len(sr.Substates) > 0 && sr.Superstate == nil {
sb.WriteString(g.formatOneCluster(sr))
} else {
sb.WriteString(g.formatOneState(sr))
}
}
for _, sr := range sm.stateConfig {
sb.WriteString(g.formatAllStateTransitions(sm, sr))
}
initialState, err := sm.State(context.Background())
if err == nil {
sb.WriteString("\n init [label=\"\", shape=point];")
sb.WriteString(fmt.Sprintf("\n init -> {%v}[style = \"solid\"]", initialState))
}
sb.WriteString("\n}")
return sb.String()
}
func (g *graph) formatActions(sr *stateRepresentation) string {
es := make([]string, 0, len(sr.EntryActions)+len(sr.ExitActions)+len(sr.ActivateActions)+len(sr.DeactivateActions))
for _, act := range sr.ActivateActions {
es = append(es, fmt.Sprintf("activated / %s", act.Description.String()))
}
for _, act := range sr.DeactivateActions {
es = append(es, fmt.Sprintf("deactivated / %s", act.Description.String()))
}
for _, act := range sr.EntryActions {
if act.Trigger == nil {
es = append(es, fmt.Sprintf("entry / %s", act.Description.String()))
}
}
for _, act := range sr.ExitActions {
es = append(es, fmt.Sprintf("exit / %s", act.Description.String()))
}
return strings.Join(es, `\n`)
}
func (g *graph) formatOneState(sr *stateRepresentation) string {
var sb strings.Builder
sb.WriteString(fmt.Sprintf("\t%v [label=\"%v", sr.State, sr.State))
act := g.formatActions(sr)
if act != "" {
sb.WriteString("|")
sb.WriteString(act)
}
sb.WriteString("\"];\n")
return sb.String()
}
func (g *graph) formatOneCluster(sr *stateRepresentation) string {
var sb strings.Builder
sb.WriteString(fmt.Sprintf("\nsubgraph cluster_%v {\n\tlabel=\"%v", sr.State, sr.State))
act := g.formatActions(sr)
if act != "" {
sb.WriteString("\n----------\n")
sb.WriteString(act)
}
sb.WriteString("\";\n")
for _, substate := range sr.Substates {
sb.WriteString(g.formatOneState(substate))
}
sb.WriteString("}\n")
return sb.String()
}
func (g *graph) getEntryActions(ab []actionBehaviour, t Trigger) []string {
var actions []string
for _, ea := range ab {
if ea.Trigger == nil || *ea.Trigger == t {
actions = append(actions, ea.Description.String())
}
}
return actions
}
func (g *graph) formatAllStateTransitions(sm *StateMachine, sr *stateRepresentation) string {
var sb strings.Builder
for _, triggers := range sr.TriggerBehaviours {
for _, trigger := range triggers {
switch t := trigger.(type) {
case *ignoredTriggerBehaviour:
sb.WriteString(g.formatOneTransition(sr.State, sr.State, t.Trigger, nil, t.Guard))
case *reentryTriggerBehaviour:
actions := g.getEntryActions(sr.EntryActions, t.Trigger)
sb.WriteString(g.formatOneTransition(sr.State, t.Destination, t.Trigger, actions, t.Guard))
case *internalTriggerBehaviour:
actions := g.getEntryActions(sr.EntryActions, t.Trigger)
sb.WriteString(g.formatOneTransition(sr.State, sr.State, t.Trigger, actions, t.Guard))
case *transitioningTriggerBehaviour:
var actions []string
if dest, ok := sm.stateConfig[t.Destination]; ok {
actions = g.getEntryActions(dest.EntryActions, t.Trigger)
}
sb.WriteString(g.formatOneTransition(sr.State, t.Destination, t.Trigger, actions, t.Guard))
case *dynamicTriggerBehaviour:
// TODO: not supported yet
}
}
}
return sb.String()
}
func (g *graph) formatOneTransition(source, destination State, trigger Trigger, actions []string, guards transitionGuard) string {
var sb strings.Builder
sb.WriteString(fmt.Sprint(trigger))
if len(actions) > 0 {
sb.WriteString(" / ")
sb.WriteString(strings.Join(actions, ", "))
}
for _, info := range guards.Guards {
if sb.Len() > 0 {
sb.WriteString(" ")
}
sb.WriteString(fmt.Sprintf("[%s]", info.Description.String()))
}
return g.formatOneLine(fmt.Sprint(source), fmt.Sprint(destination), sb.String())
}
func (g *graph) formatOneLine(fromNodeName, toNodeName, label string) string {
return fmt.Sprintf("\n%s -> %s [style=\"solid\", label=\"%s\"];", fromNodeName, toNodeName, label)
}