webos Mojo: Foundations.Control.Future - make nest usable

future-nest-fix.js

/* wait for "this" future to reach this point, run "inner" in background; copy result from "inner" future */
Future.prototype.nest = function(inner) {
	var succ, result, exc, wait = 2, f = this;
	this.then(function () {
		f.exception;
		if (0 == --wait) { if (succ) f.result = result; else f.exception = exc; }
	});
	inner.then(function (future) {
		if (future.exception) { succ = false; exc = future.exception; } else { succ = true; result = future.result; }
		if (0 == --wait) { if (succ) f.result = result; else f.exception = exc; }
	});
	return this;
};