Tools for working with goto-based state machines in go (golang).
The program in bin/gotofsm-dot.go will print a graphviz file for a state machine implemented using goto statements. Consider the following file:
package main
func Run() {
start:
if true {
goto state1
}
goto state2
state1:
goto state3
state2:
if true {
goto state4
}
goto state1
state3:
if true {
goto start
}
goto end
state4:
if true {
goto state1
}
goto start
end:
}
func main() {}Assuming that this file is named example.go, we run:
gotofsm-dot example.go Run
Which prints
digraph {
start->state1;
start->state2;
state1->state3;
state2->state4;
state2->state1;
state3->start;
state3->end;
state4->state1;
state4->start;
}
The bash script bin/gotofsm-dot-viewer takes the same arguments as gotofsm-dot, but pipes the output to a file and launches the xdot viewer.
Here's what the output looks like as a png:
