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// From rust:
/* global resourcesSuffix */
var currentTheme = document.getElementById("themeStyle");
var mainTheme = document.getElementById("mainThemeStyle");
var savedHref = [];
function hasClass(elem, className) {
return elem && elem.classList && elem.classList.contains(className);
}
function addClass(elem, className) {
if (!elem || !elem.classList) {
return;
}
elem.classList.add(className);
}
function removeClass(elem, className) {
if (!elem || !elem.classList) {
return;
}
elem.classList.remove(className);
}
function isHidden(elem) {
return elem.offsetParent === null;
}
function onEach(arr, func, reversed) {
if (arr && arr.length > 0 && func) {
var length = arr.length;
if (reversed !== true) {
for (var i = 0; i < length; ++i) {
if (func(arr[i]) === true) {
return true;
}
}
} else {
for (var i = length - 1; i >= 0; --i) {
if (func(arr[i]) === true) {
return true;
}
}
}
}
return false;
}
function onEachLazy(lazyArray, func, reversed) {
return onEach(
Array.prototype.slice.call(lazyArray),
func,
reversed);
}
function usableLocalStorage() {
// Check if the browser supports localStorage at all:
if (typeof(Storage) === "undefined") {
return false;
}
// Check if we can access it; this access will fail if the browser
// preferences deny access to localStorage, e.g., to prevent storage of
// "cookies" (or cookie-likes, as is the case here).
try {
window.localStorage;
} catch(err) {
// Storage is supported, but browser preferences deny access to it.
return false;
}
return true;
}
function updateLocalStorage(name, value) {
if (usableLocalStorage()) {
localStorage[name] = value;
} else {
// No Web Storage support so we do nothing
}
}
function getCurrentValue(name) {
if (usableLocalStorage() && localStorage[name] !== undefined) {
return localStorage[name];
}
return null;
}
function switchTheme(styleElem, mainStyleElem, newTheme) {
var fullBasicCss = "rustdoc" + resourcesSuffix + ".css";
var fullNewTheme = newTheme + resourcesSuffix + ".css";
var newHref = mainStyleElem.href.replace(fullBasicCss, fullNewTheme);
if (styleElem.href === newHref) {
return;
}
var found = false;
if (savedHref.length === 0) {
onEachLazy(document.getElementsByTagName("link"), function(el) {
savedHref.push(el.href);
});
}
onEach(savedHref, function(el) {
if (el === newHref) {
found = true;
return true;
}
});
if (found === true) {
styleElem.href = newHref;
updateLocalStorage("rustdoc-theme", newTheme);
}
}
switchTheme(currentTheme, mainTheme, getCurrentValue("rustdoc-theme") || "light");
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