rastrillo / fiesta Public

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1	/*! Fiesta 1.0.0 | MPL-2.0 | https://fiesta.rastrillo.org */
2	(function () {
3	"use strict";
4
5	var ROOT = "[rst-shell-sidebar],[rst-shell-console],.rst-shell-sidebar,.rst-shell-console";
6	var INDEX = '[rst-shell-sidebar~="index"],[rst-shell-console~="index"],.rst-shell-sidebar--index,.rst-shell-console--index';
7	var PAGE = '[rst-shell-sidebar~="page"],[rst-shell-console~="page"],.rst-shell-sidebar--page,.rst-shell-console--page';
8	var BACK = "[rst-shell-back] > a[href],.rst-shell__back > a[href]";
9	var NAV = "[rst-shell-nav] a[href],.rst-shell__nav a[href]";
10	var NARROW = "(max-width: 799.98px)";
11	var RETURN = "rst-shell-return", WENT_BACK = "rst-shell-back";
12
13	function store(fn) {
14	try { return fn(window.sessionStorage); } catch (e) { return null; }
15	}
16	function take(key) {
17	return store(function (s) { var v = s.getItem(key); s.removeItem(key); return v; });
18	}
19	function place(href) {
20	var u = new URL(href, location.href);
21	return u.origin === location.origin ? u.pathname + u.search : null;
22	}
23	function view(sel) {
24	var r = document.querySelector(ROOT);
25	return !!r && r.matches(sel);
26	}
27
28	function returnFocus() {
29	if (document.prerendering || !view(INDEX)) return;
30	var rec = take(RETURN), links, hit = null, i, id;
31	if (!matchMedia(NARROW).matches) return;
32	links = document.querySelectorAll(NAV);
33	for (i = 0; rec && !hit && i < links.length; i++) {
34	if (place(links[i].href) === rec) hit = links[i];
35	}
36	if (!hit && location.hash) {
37	try { id = decodeURIComponent(location.hash.slice(1)); } catch (e) { id = location.hash.slice(1); }
38	hit = document.getElementById(id);
39	if (hit && !hit.matches(NAV)) hit = null;
40	}
41	if (hit) hit.focus();
42	}
43
44	function reveal(e) {
45	var back = take(WENT_BACK) === location.pathname + location.search, a = window.navigation && navigation.activation;
46	if (!back && a && a.navigationType === "traverse" && a.from && a.entry) back = a.entry.index < a.from.index;
47	returnFocus();
48	if (e.viewTransition && e.viewTransition.types) e.viewTransition.types.add(back ? "back" : "forward");
49	}
50	if ("onpagereveal" in window) window.addEventListener("pagereveal", reveal);
51	else window.addEventListener("pageshow", returnFocus);
52
53	function leave() {
54	if (view(PAGE)) store(function (s) { s.setItem(RETURN, location.pathname + location.search); });
55	}
56	window.addEventListener("onpageswap" in window ? "pageswap" : "pagehide", leave);
57
58	document.addEventListener("click", function (e) {
59	var a = e.target.closest && e.target.closest(BACK), nav = window.navigation, cur, prev, want;
60	if (!a || e.defaultPrevented || e.button !== 0 || e.ctrlKey || e.metaKey || e.shiftKey || e.altKey) return;
61	want = place(a.href);
62	if (want !== null) store(function (s) { s.setItem(WENT_BACK, want); });
63	cur = nav && nav.currentEntry;
64	if (!cur || cur.index < 1) return;
65	prev = nav.entries()[cur.index - 1];
66	if (want !== null && prev && !prev.sameDocument && prev.url && place(prev.url) === want) {
67	e.preventDefault();
68	history.back();
69	}
70	});
71	})();
72