simplestatemachine

A very simple state machine for node.js

• when defines the condition that will match an event on a particular state.
• then defines what to do when a match is found, and what the next state is.
• any is a condition that is always met (like in "with any event")
• default is a shortcut for any and for staying in the same state, doing something. That is default(f) is like when(true).then(f(); return thisstate;)
• The selector in when is something that returns true or false. If true is returned, then all evaluations are halted and then is executed.

var stateMachine = require('statemachine');

var EventOne = function(event){
   return event == 'one';
}

var EventTwo = function(event){
	return event == 'two';
} 

var sm = new stateMachine('sm');

sm.state('one')
	.when(EventOne)
		.then(function(e){console.log('S1: ' + e); return 'one';})
	.when(EventTwo)
		.then(function(e){console.log('S1: ' + e); return 'two';})
	.any()
		.then(function(e){console.log('S1: (any)' + e); return 'one';});

sm.state('two')
	.when(EventTwo)
		.then(function(e){console.log('S2: ' + e); return 'two';})
	.when(EventOne)
		.then(function(e){console.log('S2: ' + e); return 'one';})
	.default(function(e){console.log('S2: (default)' + e)});

sm.currentState = 'one';

sm.process('one');
sm.process('four');
sm.process('two');
sm.process('three');
sm.process('one');
sm.process('hello');