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/*
* Instant Page Copyright (C) 2019-2023 Alexandre Dieulot
* https://github.com/instantpage/instant.page/blob/master/LICENSE
* Licence: MIT | https://mit-license.org/
*/
(function () {
/*/
* Element.closest() polyfill
* https://developer.mozilla.org/en-US/docs/Web/API/Element/closest
* https://github.com/idmadj/element-closest-polyfill#readme
* Copyright (C) Abdelmadjid Hammou
* Licence: ISC | https://www.isc.org/licenses/
/*/
if (typeof Element !== "undefined") {
if (!Element.prototype.matches) {
Element.prototype.matches = Element.prototype.msMatchesSelector ||
Element.prototype.webkitMatchesSelector;
}
if (!Element.prototype.closest) {
Element.prototype.closest = function (s) {
var el = this;
do {
if (el.matches(s)) return el;
el = el.parentElement || el.parentNode;
} while (el !== null && el.nodeType === 1);
return null;
};
}
}
/*/
* -----------------------------------------------------------------
/*/
function fetch(url, method, callback) {
const http = new XMLHttpRequest();
http.onreadystatechange = function () {
if (http.readyState === 4 && http.status === 200) {
if (callback) callback(http);
}
};
http.open(method, url);
http.send();
return http;
}
self.addEventListener("DOMContentLoaded", function () {
["mouseout", "mousedown", "touchstart"].forEach(function (event) {
self.addEventListener(event, function (event) {
const url = event.target.closest("a");
if (preloadable(url) === undefined) return;
preload(url.href);
});
});
function preloadable(url) {
switch (true) {
case (url === null || url.href === null): return;
case (url.origin !== location.origin): return;
case (["http:", "https:"].includes(url.protocol) === null): return;
case (url.protocol === "http:" && location.protocol === "https:"): return;
case (url.hash && url.pathname + url.search == location.pathname + location.search): return;
default: return true;
}
}
function preload(url) {
const prefetcher = document.createElement("link");
prefetcher.rel = "custom-prefetch";
prefetcher.href = url;
const selector = 'link[rel="'.concat(prefetcher.rel, '"][href="').concat(prefetcher.href, '"]');
const prefetched = document.head.contains(document.querySelector(selector));
if (prefetched) { return; }
document.head.appendChild(prefetcher);
fetch(url, "GET", function () {});
}
});
})();
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