gistfile1.js

var rl = require('readline').createInterface({
	input: process.stdin,
	output: process.stdout
});
 
function Point(x, y){
	this.x = x;
	this.y = y;
}
 
// Parse some coordinate "[-]xx,[-]yy" into a Point
function parsePoint(str){
	str = str.trim().split(",");
 
	var x = parseFloat(str[0]),
		y = parseFloat(str[1]);
 
	return new Point(x, y);
};
 
var A, B, C, D, actions = [function(next) {
	rl.question("Point A (x,y): ", function(res){
		A = parsePoint(res);
		next()
	});
}, function(next) {
	rl.question("Point B (x,y): ", function(res){
		B = parsePoint(res);
		next();
	});
}, function(next) {
	rl.question("Point C (x,y): ", function(res){
		C = parsePoint(res);
		next();
	});
}, function(next) {
	rl.question("Point D (x,y): ", function(res){
		D = parsePoint(res);
		next();
	});	
}, function() {
	console.info("All questions answered");
	console.log(A);
	console.log(B);
	console.log(C);
	console.log(D);
	rl.close();
}], i=0;
 
function nextAction() {
	if(actions[i]) actions[i++](nextAction);
}
nextAction();