89 lines
2.5 KiB
JavaScript
89 lines
2.5 KiB
JavaScript
/*!
|
|
* 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');
|