Exemplo n.º 1
0
// small util that turn a regexp into a graphiz .dot file and then into a png
func main() {
	exp := os.Args[1]
	fmt.Printf("Parsing %s\n", exp)

	var m gogrex.StringManager
	g, err := gogrex.ParseGrex(&m, exp)
	if err != nil {
		fmt.Printf("error %s", err)
	}

	fmt.Printf("\n%s\n", g.String())
	err = ioutil.WriteFile("graph.dot", []byte(g.String()), 0644)
	if err != nil {
		panic(err)
	}
	dot("graph.dot")
}
Exemplo n.º 2
0
//computes all that is needed for this neobin
func compile(n *neobin) (m *neobinManager, err error) {

	// parse the expression using grex
	m = &neobinManager{neobin: n}
	n.grex, err = gogrex.ParseGrex(m, n.Expression)

	// build state name // start with the input one
	name := "State"
	if m.neobin.Name != nil {
		name = *m.neobin.Name
	}

	in := m.InputState()
	in.State = name
	in.Input = true

	// for every one declared in the states section:
	for _, s := range n.States {
		vertex := m.StateByPath(s.Path)
		vertex.Path = s.Path
		vertex.State = s.State
	}

	// copy src and dest into the transitionEdge
	for edge, bounds := range n.grex.Edges() {
		t := edge.(*transitionEdge)
		t.source = bounds.Start().(*state)
		t.dest = bounds.End().(*state)
	}

	// mark outputs as so
	for _, s := range n.grex.OutputVertice() {
		st := s.(*state)
		st.Output = true
	}

	v := n.grex.Vertices()
	m.neobin.States = make([]*state, len(v))

	for i, st := range v {
		s := st.(*state)
		m.neobin.States[i] = s
	}

	// parse all state, then all transitions
	for _, s := range m.States() {
		//s := st.(*state)
		outEdges := n.grex.OutputEdges(s)

		//sort outEdges first
		sort.Sort(ByName{outEdges})

		s.Transitions = make([]*transitionEdge, len(outEdges))
		for i, v := range outEdges {
			t := v.(*transitionEdge)
			s.Transitions[i] = t
		}

		//mark the boolean choice
		s.Choice = len(outEdges) > 1
		// run the state template
		if err != nil {
			panic(err)
		}

		var id int // the unique id for the transition
		for _, t := range s.Transitions {
			t.Id = id
			id++
			if err != nil {
				panic(err)
			}
		}
	}

	return
}