quixote/src/descriptors/relative_size.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";

var ensure = require("../util/ensure.js");
var Size = require("../values/size.js");
var Descriptor = require("./descriptor.js");
var SizeDescriptor = require("./size_descriptor.js");
var Value = require("../values/value.js");
var SizeMultiple = require("./size_multiple.js");

var PLUS = 1;
var MINUS = -1;

var Me = module.exports = function RelativeSize(direction, relativeTo, amount) {
	ensure.signature(arguments, [ Number, Descriptor, [Number, Descriptor, Value] ]);

	this.should = this.createShould();

	this._direction = direction;
	this._relativeTo = relativeTo;

	if (typeof amount === "number") {
		this._amount = Size.create(Math.abs(amount));
		if (amount < 0) this._direction *= -1;
	}
	else {
		this._amount = amount;
	}
};
SizeDescriptor.extend(Me);

Me.larger = factoryFn(PLUS);
Me.smaller = factoryFn(MINUS);

Me.prototype.value = function value() {
	ensure.signature(arguments, []);

	var baseValue = this._relativeTo.value();
	var relativeValue = this._amount.value();

	if (this._direction === PLUS) return baseValue.plus(relativeValue);
	else return baseValue.minus(relativeValue);
};

Me.prototype.toString = function toString() {
	ensure.signature(arguments, []);

	var base = this._relativeTo.toString();
	if (this._amount.equals(Size.create(0))) return base;

	var relation = this._amount.toString();
	if (this._direction === PLUS) relation += " larger than ";
	else relation += " smaller than ";

	return relation + base;
};

function factoryFn(direction) {
	return function factory(relativeTo, amount) {
		return new Me(direction, relativeTo, amount);
	};
}