rcshubhadeep

package main

import (
	"errors"
	"fmt"
	"strconv"

	"gonum.org/v1/gonum/graph"
	"gonum.org/v1/gonum/graph/multi"
)

rcshubhadeep

func main() {
	stateMachine := New()

	initState := stateMachine.Init("locked")
	unlockedSate := stateMachine.NewState("unlocked")

	coinRule := NewRule(Operator("eq"), Event("coin"))
	pushRule := NewRule(Operator("eq"), Event("push"))

	stateMachine.LinkStates(initState, unlockedSate, coinRule)

rcshubhadeep

func (s *StateMachine) Compute(events []string, printState bool) State {
	for _, e := range events {
		s.FireEvent(Event(e))
		if printState {
			fmt.Printf("%s\n", s.PresentState.String())
		}
	}
	return s.PresentState
}

rcshubhadeep

func (s *StateMachine) FireEvent(e Event) error {
	presentNode := s.PresentState

	it := s.g.From(presentNode.Id)

	for it.Next() {
		n := s.g.Node(it.Node().ID()).(State)
		line := graph.LinesOf(s.g.Lines(presentNode.Id, n.Id))[0].(Link) // There can be one defined path between two distinct states

		for key, val := range line.Rules {

rcshubhadeep

func NewRule(triggerConditionOperator Operator, comparisonValue Event) map[Operator]Event {
	return map[Operator]Event{triggerConditionOperator: comparisonValue}
}

rcshubhadeep

func (s *StateMachine) Init(initStateValue interface{}) State {
	s.PresentState = State{Id: int64(NodeIDCntr), Value: initStateValue}
	s.g.AddNode(s.PresentState)
	NodeIDCntr++
	return s.PresentState
}

func (s *StateMachine) NewState(stateValue interface{}) State {
	state := State{Id: int64(NodeIDCntr), Value: stateValue}
	s.g.AddNode(state)

rcshubhadeep

func New() *StateMachine {
	s := &StateMachine{}
	s.g = multi.NewDirectedGraph()

	return s
}

rcshubhadeep

type Event string
type Operator string

var NodeIDCntr = 0
var LineIdCntr = 1

type StateMachine struct {
	PresentState State
	g            *multi.DirectedGraph
}

rcshubhadeep

type State struct {
	Id    int64
	Value interface{}
}

type Link struct {
	Id    int64
	T, F  graph.Node
	Rules map[Operator]Event
}

rcshubhadeep

package main

import (
	"errors"
	"fmt"
	"strconv"

	"gonum.org/v1/gonum/graph"
	"gonum.org/v1/gonum/graph/multi"
)