A userscript that adds a color swatch next to the code color definition
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// ==UserScript==
// @name GitHub Code Colors
// @version 1.2.2
// @description A userscript that adds a color swatch next to the code color definition
// @license MIT
// @author Rob Garrison
// @namespace https://github.com/Mottie
// @include https://github.com/*
// @run-at document-idle
// @grant GM.addStyle
// @grant GM_addStyle
// @require https://greasemonkey.github.io/gm4-polyfill/gm4-polyfill.js?updated=20180103
// @require https://greasyfork.org/scripts/28721-mutations/code/mutations.js?version=597950
// @icon https://assets-cdn.github.com/pinned-octocat.svg
// ==/UserScript==
(() => {
"use strict";
GM.addStyle(`
.ghcc-block { width:12px; height:12px; display:inline-block;
vertical-align:middle; margin-right:4px; border-radius:3px;
border:1px solid rgba(119, 119, 119, 0.5); }
`);
const namedColors = [
"aliceblue", "antiquewhite", "aqua", "aquamarine", "azure", "beige",
"bisque", "black", "blanchedalmond", "blue", "blueviolet", "brown",
"burlywood", "cadetblue", "chartreuse", "chocolate", "coral",
"cornflowerblue", "cornsilk", "crimson", "cyan", "darkblue", "darkcyan",
"darkgoldenrod", "darkgray", "darkgrey", "darkgreen", "darkkhaki",
"darkmagenta", "darkolivegreen", "darkorange", "darkorchid", "darkred",
"darksalmon", "darkseagreen", "darkslateblue", "darkslategray",
"darkslategrey", "darkturquoise", "darkviolet", "deeppink", "deepskyblue",
"dimgray", "dimgrey", "dodgerblue", "firebrick", "floralwhite",
"forestgreen", "fuchsia", "gainsboro", "ghostwhite", "gold", "goldenrod",
"gray", "grey", "green", "greenyellow", "honeydew", "hotpink",
"indianred", "indigo", "ivory", "khaki", "lavender", "lavenderblush",
"lawngreen", "lemonchiffon", "lightblue", "lightcoral", "lightcyan",
"lightgoldenrodyellow", "lightgray", "lightgrey", "lightgreen",
"lightpink", "lightsalmon", "lightseagreen", "lightskyblue",
"lightslategray", "lightslategrey", "lightsteelblue", "lightyellow",
"lime", "limegreen", "linen", "magenta", "maroon", "mediumaquamarine",
"mediumblue", "mediumorchid", "mediumpurple", "mediumseagreen",
"mediumslateblue", "mediumspringgreen", "mediumturquoise",
"mediumvioletred", "midnightblue", "mintcream", "mistyrose", "moccasin",
"navajowhite", "navy", "oldlace", "olive", "olivedrab", "orange",
"orangered", "orchid", "palegoldenrod", "palegreen", "paleturquoise",
"palevioletred", "papayawhip", "peachpuff", "peru", "pink", "plum",
"powderblue", "purple", "rebeccapurple", "red", "rosybrown", "royalblue",
"saddlebrown", "salmon", "sandybrown", "seagreen", "seashell", "sienna",
"silver", "skyblue", "slateblue", "slategray", "slategrey", "snow",
"springgreen", "steelblue", "tan", "teal", "thistle", "tomato",
"turquoise", "violet", "wheat", "white", "whitesmoke", "yellow",
"yellowgreen"
].join("|");
const regexNamed = new RegExp("^(" + namedColors + ")$", "i");
// Ex: #123, #123456 or 0x123456 (unix style colors, used by three.js)
const regexHex = /^(#|0x)([0-9A-F]{6,8}|[0-9A-F]{3,4})$/i;
// Ex: rgb(0,0,0) or rgba(0,0,0,0.2)
const regexRGB = /^rgba?(\([^\)]+\))?/i;
const regexRGBA = /rgba/i;
// Ex: hsl(0,0%,0%) or hsla(0,0%,0%,0.2);
const regexHSL = /^hsla?(\([^\)]+\))?/i;
// Misc regex
const regexQuotes = /['"]/g;
const regexUnix = /^0x/;
const regexPercent = /%%/g;
// Don't use a div, because GitHub-Dark adds a :hover background
// color definition on divs
const block = document.createElement("span");
block.className = "ghcc-block";
function addNode(el, val) {
const node = block.cloneNode();
node.style.backgroundColor = val;
// Don't add node if color is invalid
if (node.style.backgroundColor !== "") {
el.insertBefore(node, el.childNodes[0]);
}
}
function getTextContent(el) {
return el ? el.textContent : "";
}
function rgb(els, el, txt) {
// Color in a string contains everything
if (el.classList.contains("pl-s")) {
txt = txt.match(regexRGB)[0];
} else {
// Rgb(a) colors contained in multiple "pl-c1" spans
let indx = regexRGBA.test(txt) ? 4 : 3;
const tmp = [];
while (indx) {
tmp.push(getTextContent(els.shift()));
indx--;
}
txt += "(" + tmp.join(",") + ")";
}
addNode(el, txt);
return els;
}
function hsl(els, el, txt) {
const tmp = /a$/i.test(txt);
if (el.classList.contains("pl-s")) {
// Color in a string contains everything
txt = txt.match(regexHSL)[0];
} else {
// Traverse this HTML... & els only contains the pl-c1 nodes
// <span class="pl-c1">hsl</span>(<span class="pl-c1">1</span>,
// <span class="pl-c1">1</span><span class="pl-k">%</span>,
// <span class="pl-c1">1</span><span class="pl-k">%</span>);
// using getTextContent in case of invalid css
txt = txt + "(" + getTextContent(els.shift()) + "," +
getTextContent(els.shift()) + "%," +
// Hsla needs one more parameter
getTextContent(els.shift()) + "%" +
(tmp ? "," + getTextContent(els.shift()) : "") + ")";
}
// Sometimes (previews only?) the .pl-k span is nested inside
// the .pl-c1 span, so we end up with "%%"
addNode(el, txt.replace(regexPercent, "%"));
return els;
}
// Loop with delay to allow user interaction
function* addBlock(els) {
let last = "";
while (els.length) {
let el = els.shift();
let txt = el.textContent;
if (
// No swatch for JavaScript Math.tan
last === "Math" ||
// Ignore nested pl-c1 (see https://git.io/fNF3N)
el.parentNode && el.parentNode.classList.contains("pl-c1")
) {
// noop
} else if (!el.querySelector(".ghcc-block")) {
if (el.classList.contains("pl-s")) {
txt = txt.replace(regexQuotes, "");
}
if (regexHex.test(txt) || regexNamed.test(txt)) {
addNode(el, txt.replace(regexUnix, "#"));
} else if (regexRGB.test(txt)) {
els = rgb(els, el, txt);
} else if (regexHSL.test(txt)) {
els = hsl(els, el, txt);
}
}
last = txt;
yield els;
}
}
function addColors() {
if (document.querySelector(".highlight")) {
let status;
// .pl-c1 targets css hex colors, "rgb" and "hsl"
const els = [...document.querySelectorAll(".pl-c1, .pl-s")];
const iter = addBlock(els);
const loop = () => {
for (let i = 0; i < 40; i++) {
status = iter.next();
}
if (!status.done) {
requestAnimationFrame(loop);
}
};
loop();
}
}
document.addEventListener("ghmo:container", addColors);
document.addEventListener("ghmo:preview", addColors);
addColors();
})();