iosver.js

/* Lotus - iosver.js
 * Copyright (C) 2014-2015  Timon Olsthoorn (tmnlsthrn)
 */

/*
 *        Redistribution and use in source and binary
 * forms, with or without modification, are permitted
 * provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the
 *    above copyright notice, this list of conditions
 *    and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the
 *    above copyright notice, this list of conditions
 *    and the following disclaimer in the documentation
 *    and/or other materials provided with the
 *    distribution.
 * 3. The name of the author may not be used to endorse
 *    or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS''
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING,
 * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
 * TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

const VERSION_CHECK_SUPPORTED = "Your iOS version is supported! 😊";
const VERSION_CHECK_NEEDS_UPGRADE = "Requires at least iOS %s 😕";
const VERSION_CHECK_UNCONFIRMED = "Not yet tested on iOS %s 😁";
const VERSION_CHECK_UNSUPPORTED = "Only compatible with iOS %s to %s 😞";

(function(document) {
	"use strict";

	function parseVersionString(version) {
		var bits = version.split(".");
		return [ bits[0], bits[1] ? bits[1] : 0, bits[2] ? bits[2] : 0 ];
	}

	function compareVersions(one, two) {
		// https://gist.github.com/TheDistantSea/8021359
		for (var i = 0; i < one.length; ++i) {
			if (two.length == i) {
				return 1;
			}

			if (Number(one[i]) == Number(two[i])) {
				continue;
			} else if (Number(one[i]) > Number(two[i])) {
				return 1;
			} else {
				return -1;
			}
		}

		if (one.length != two.length) {
			return -1;
		}

		return 0;
	}

	var prerequisite = document.querySelector(".prerequisite"),
		version = navigator.appVersion.match(/CPU( iPhone)? OS (\d+)_(\d+)(_(\d+))? like/i);

	if (!prerequisite || !version) {
		return;
	}

	var osVersion = [ version[2], version[3], version[4] ? version[5] : 0 ],

		osString = osVersion[0] + "." + osVersion[1] + (osVersion[2] && osVersion[2] != 0 ? "." + osVersion[2] : ""),
		minString = prerequisite.dataset.minIos,
		maxString = prerequisite.dataset.maxIos,

		minVersion = parseVersionString(minString),
		maxVersion = maxString ? parseVersionString(maxString) : null,

		message = VERSION_CHECK_SUPPORTED,
		isBad = false;

	if (compareVersions(minVersion, osVersion) == 1) {
		message = VERSION_CHECK_NEEDS_UPGRADE.replace("%s", minString);
		isBad = true;
	} else if (maxVersion && compareVersions(maxVersion, osVersion) == -1) {
		if ("unsupported" in prerequisite.dataset) {
			message = VERSION_CHECK_UNSUPPORTED.replace("%s", minString).replace("%s", maxString);
		} else {
			message = VERSION_CHECK_UNCONFIRMED.replace("%s", osString);
		}

		isBad = true;
	}

//	prerequisite.querySelector("p").textContent = message;
    prerequisite.querySelector("p").innerHTML = message;

	if (isBad) {
		prerequisite.classList.add("info");
	}
})(document);