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axSGreaseSkeleton.js
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151 lines (130 loc) · 3.66 KB
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// ==UserScript==
// @name some site Accessibility Fixes
// @namespace http://axSgrease.nvaccess.org/
// @description Improves the accessibility of some site.
// @author James Teh <jteh@mozilla.com>
// @copyright 2019 Mozilla Corporation, Derek Riemer
// @license Mozilla Public License version 2.0
// @version 2019.1
// @include https://some.site/*
// ==/UserScript==
/*** Functions for common tweaks. ***/
function makeHeading(el, level) {
el.setAttribute("role", "heading");
el.setAttribute("aria-level", level);
}
function makeRegion(el, label) {
el.setAttribute("role", "region");
el.setAttribute("aria-label", label);
}
function makeButton(el, label) {
el.setAttribute("role", "button");
if (label) {
el.setAttribute("aria-label", label);
}
}
function makePresentational(el) {
el.setAttribute("role", "presentation");
}
function setLabel(el, label) {
el.setAttribute("aria-label", label);
}
function makeHidden(el) {
el.setAttribute("aria-hidden", "true");
}
function setExpanded(el, expanded) {
el.setAttribute("aria-expanded", expanded ? "true" : "false");
}
var idCounter = 0;
// Get a node's id. If it doesn't have one, make and set one first.
function setAriaIdIfNecessary(elem) {
if (!elem.id) {
elem.setAttribute("id", "axsg-" + idCounter++);
}
return elem.id;
}
function makeElementOwn(parentElement, listOfNodes){
ids = [];
for(let node of listOfNodes){
ids.push(setAriaIdIfNecessary(node));
}
parentElement.setAttribute("aria-owns", ids.join(" "));
}
// Focus something even if it wasn't made focusable by the author.
function forceFocus(el) {
let focusable = el.hasAttribute("tabindex");
if (focusable) {
el.focus();
return;
}
el.setAttribute("tabindex", "-1");
el.focus();
}
/*** Code to apply the tweaks when appropriate. ***/
function applyTweak(el, tweak) {
if (Array.isArray(tweak.tweak)) {
let [func, ...args] = tweak.tweak;
func(el, ...args);
} else {
tweak.tweak(el);
}
}
function applyTweaks(root, tweaks, checkRoot) {
for (let tweak of tweaks) {
for (let el of root.querySelectorAll(tweak.selector)) {
try {
applyTweak(el, tweak);
} catch (e) {
console.log("Exception while applying tweak for '" + tweak.selector + "': " + e);
}
}
if (checkRoot && root.matches(tweak.selector)) {
try {
applyTweak(root, tweak);
} catch (e) {
console.log("Exception while applying tweak for '" + tweak.selector + "': " + e);
}
}
}
}
let observer = new MutationObserver(function(mutations) {
for (let mutation of mutations) {
try {
if (mutation.type === "childList") {
for (let node of mutation.addedNodes) {
if (node.nodeType != Node.ELEMENT_NODE) {
continue;
}
applyTweaks(node, DYNAMIC_TWEAKS, true);
}
} else if (mutation.type === "attributes") {
applyTweaks(mutation.target, DYNAMIC_TWEAKS, true);
}
} catch (e) {
// Catch exceptions for individual mutations so other mutations are still handled.
console.log("Exception while handling mutation: " + e);
}
}
});
function init() {
applyTweaks(document, LOAD_TWEAKS, false);
applyTweaks(document, DYNAMIC_TWEAKS, false);
options = {childList: true, subtree: true};
if (DYNAMIC_TWEAK_ATTRIBS.length > 0) {
options.attributes = true;
options.attributeFilter = DYNAMIC_TWEAK_ATTRIBS;
}
observer.observe(document, options);
}
/*** Define the actual tweaks. ***/
// Tweaks that only need to be applied on load.
const LOAD_TWEAKS = [
];
// Attributes that should be watched for changes and cause dynamic tweaks to be
// applied.
const DYNAMIC_TWEAK_ATTRIBS = [];
// Tweaks that must be applied whenever an element is added/changed.
const DYNAMIC_TWEAKS = [
];
/*** Lights, camera, action! ***/
init();