quixote/src/util/oop.js

CSS unit and integration testing

// Copyright (c) 2014 Titanium I.T. LLC. All rights reserved. For license, see "README" or "LICENSE" file.
"use strict";

// can't use ensure.js due to circular dependency
var shim = require("./shim.js");

exports.className = function(constructor) {
	if (typeof constructor !== "function") throw new Error("Not a constructor");
	return shim.Function.name(constructor);
};

exports.instanceName = function(obj) {
	var prototype = shim.Object.getPrototypeOf(obj);
	if (prototype === null) return "<no prototype>";

	var constructor = prototype.constructor;
	if (constructor === undefined || constructor === null) return "<anon>";

	return shim.Function.name(constructor);
};

exports.extendFn = function extendFn(parentConstructor) {
	return function(childConstructor) {
		childConstructor.prototype = shim.Object.create(parentConstructor.prototype);
		childConstructor.prototype.constructor = childConstructor;
	};
};

exports.makeAbstract = function makeAbstract(constructor, methods) {
	var name = shim.Function.name(constructor);
	shim.Array.forEach(methods, function(method) {
		constructor.prototype[method] = function() {
			throw new Error(name + " subclasses must implement " + method + "() method");
		};
	});

	constructor.prototype.checkAbstractMethods = function checkAbstractMethods() {
		var unimplemented = [];
		var self = this;
		shim.Array.forEach(methods, function(name) {
			if (self[name] === constructor.prototype[name]) unimplemented.push(name + "()");
		});
		return unimplemented;
	};
};