js/codeq/stateMachine.js


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/**
 * Created by robert on 9/15/15.
 */

codeq.makeStateMachine = function(def){
    var currState = null;
    return {
        'transition': function(name){
            var newState = def[name];
            if (!newState) {
                codeq.log.error('Cannot transition to state ' + name + ': it is not defined');
                return;
            }
            if (newState === currState) {
                codeq.log.info('Will not transition between identical states: ' + name);
                return;
            }
            if(currState !== null) currState.exit();
            currState = newState;
            currState.enter.apply(currState,Array.prototype.slice.apply(arguments,[1]));
        },
        'destroy': function(){
            if(currState !== null) currState.exit();
            currState = null;
        },
        'register': function(name,state){
            if (name in def) codeq.log.error('The state ' + name + ' is already registered, overriding');
            def[name] = state;
        }
    }
};
codeq.globalStateMachine = codeq.makeStateMachine({});