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Highlight current state in Graphviz visualizer #84

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merged 1 commit into from
Jul 15, 2022
Merged

Highlight current state in Graphviz visualizer #84

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30 changes: 12 additions & 18 deletions graphviz_visualizer.go
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Original file line number Diff line number Diff line change
Expand Up @@ -14,8 +14,8 @@ func Visualize(fsm *FSM) string {
sortedStateKeys, _ := getSortedStates(fsm.transitions)

writeHeaderLine(&buf)
writeTransitions(&buf, fsm.current, sortedEKeys, fsm.transitions)
writeStates(&buf, sortedStateKeys)
writeTransitions(&buf, sortedEKeys, fsm.transitions)
writeStates(&buf, fsm.current, sortedStateKeys)
writeFooter(&buf)

return buf.String()
Expand All @@ -26,29 +26,23 @@ func writeHeaderLine(buf *bytes.Buffer) {
buf.WriteString("\n")
}

func writeTransitions(buf *bytes.Buffer, current string, sortedEKeys []eKey, transitions map[eKey]string) {
// make sure the current state is at top
func writeTransitions(buf *bytes.Buffer, sortedEKeys []eKey, transitions map[eKey]string) {
for _, k := range sortedEKeys {
if k.src == current {
v := transitions[k]
buf.WriteString(fmt.Sprintf(` "%s" -> "%s" [ label = "%s" ];`, k.src, v, k.event))
buf.WriteString("\n")
}
}
for _, k := range sortedEKeys {
if k.src != current {
v := transitions[k]
buf.WriteString(fmt.Sprintf(` "%s" -> "%s" [ label = "%s" ];`, k.src, v, k.event))
buf.WriteString("\n")
}
v := transitions[k]
buf.WriteString(fmt.Sprintf(` "%s" -> "%s" [ label = "%s" ];`, k.src, v, k.event))
buf.WriteString("\n")
}

buf.WriteString("\n")
}

func writeStates(buf *bytes.Buffer, sortedStateKeys []string) {
func writeStates(buf *bytes.Buffer, current string, sortedStateKeys []string) {
for _, k := range sortedStateKeys {
buf.WriteString(fmt.Sprintf(` "%s";`, k))
if k == current {
buf.WriteString(fmt.Sprintf(` "%s" [color = "red"];`, k))
} else {
buf.WriteString(fmt.Sprintf(` "%s";`, k))
}
buf.WriteString("\n")
}
}
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2 changes: 1 addition & 1 deletion graphviz_visualizer_test.go
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Original file line number Diff line number Diff line change
Expand Up @@ -24,7 +24,7 @@ digraph fsm {
"intermediate" -> "closed" [ label = "part-close" ];
"open" -> "closed" [ label = "close" ];

"closed";
"closed" [color = "red"];
"intermediate";
"open";
}`
Expand Down