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/*!
* Copyright 2018 The Rust Project Developers. See the COPYRIGHT
* file at the top-level directory of this distribution and at
* http://rust-lang.org/COPYRIGHT.
*
* Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
* http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
* <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
* option. This file may not be copied, modified, or distributed
* except according to those terms.
*/
var currentTheme = document.getElementById("themeStyle");
var mainTheme = document.getElementById("mainThemeStyle");
var savedHref = [];
function onEach(arr, func) {
if (arr && arr.length > 0 && func) {
for (var i = 0; i < arr.length; i++) {
if (func(arr[i]) === true) {
return true;
}
}
}
return false;
}
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) {
onEach(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');
|
