ДЗ5 таск 2

UserInput.js

var userInput = [
	"10 KM/H, 20 m",
	"12 KM/sec, 1 km",
	"7 miles/M, 123 miles",
	"10 m/MIN, 2 metra",
	"20 m/sec, 10 m",
	"3 hours/min, 4 m"
];

var calculateSpendTime = ( function() {
	
	var availableUnits = {
		distance : {
			'km' : 1000,
			'm' : 1
		},
		time : {
			'h' : 3600,
			'm' : 60,
			's' : 1
		}
	}
	
	function readUserInput(str) {
		var str = removeExtraSpaces(str).toLowerCase();
		var args = str.split(',')
		if(args.length !== 2) throw 'Wrong input format : "xx (speed) , xx (distanse)")';
		var speed = parseUnit(trim(args[0])),
			distance = parseUnit(trim(args[1]));
		return spendTime(speed, distance);
	}
	function convertDistance(from, to) {
		var distance = availableUnits.distance;
		return distance[from] / distance[to];
	}
	
	function trim(string) {
		return string.replace(/^\s|\s$/, '');
	}
	
	function removeExtraSpaces( string) {
		return string.replace(/\s+/g, ' ');
	}
	
	function contains(item, mas) {
		for(var key in mas) {
			if (key === item) return true;
		}
		return false;
	}
	
	function isTime(unit) {
		return contains(unit, availableUnits.time);
	}
	
	function isDistance(unit) {
		return contains(unit, availableUnits.distance);
	}
	
	function parseUnit(unit){
		var items = unit.split(' '),
			res = {},
			number = parseInt(items[0], 10),
			dimension = items[1].split('/');
		if (items.length !== 2) throw 'Space is required in ' + unit;
		if (number !== number) throw 'Wrong number format in ' + unit;
		if (dimension.length === 2) {
			var distance = dimension[0],
				time = dimension[1]
			if(isDistance(distance) && isTime(time)) {
				res.distance = distance;
				res.time = time;
			} else throw 'Wrong dimension format in ' + items[1];
		} else if(isDistance(dimension[0])){
			res.distance = dimension[0];
		} else throw 'Wrong dimension format';
		res.number = number;
		return res;
	}
	
	function spendTime( speed, distance ) {
		if(!speed || ! distance) throw 'Strange uncatched error';
		return {
			value : distance.number / speed.number * convertDistance(speed.distance, distance.distance),
			distanceUnit : distance.distance,
			timeUnit : speed.time
		}
	}
	
	return {
		getSpendTime : readUserInput,
		addDistanceUnit : function(name, value) {
			availableUnits.distance[name] = value;
		}
	}
})()


var calc = calculateSpendTime;
calc.addDistanceUnit('miles',1600)
for(var i = 0; i < userInput.length; i++ ) {
	console.log('User input : ' + userInput[i])
	try{
		console.log('Result : ', calc.getSpendTime(userInput[i]));
	}catch(e){
		console.log('Error : ' + e);
	}
}