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Script gives wikipedia pages a dark color theme
Mint
// ==UserScript==
// @name Wikipedia Dark Theme
// @namespace https://github.com/MaxsLi/WikipediaDarkTheme
// @version 0.87
// @icon https://www.wikipedia.org/favicon.ico
// @description Script gives wikipedia pages a dark color theme
// @author Shangru Li
// @match *://*.wikipedia.org/*
// @grant none
// @run-at document-start
// @name:zh-CN 维基百科黑色主题
// @description:zh-cn 给予维基百科网页一个黑色主题
// ==/UserScript==
// The main function is called at every `onreadystatechange`
// Document state will go from `loading` --> `interactive` --> `complete`
// Metadata Block `@run-at document-start` will ensure the script start executing when `loading`
(document.onreadystatechange = function () {
//##################---default_values---#####################################
var default_contrastValue = 8;
var default_foregroundColor = "rgb(238, 255, 255)";
var default_backgroundColor = "rgb(35, 35, 35)";
//##################---one_could_alter_if_desired---#########################
//##################---controller---#########################################
// Check each document state and take action accordingly
if ('loading' == document.readyState) {
// if document is loading we first hide the whole page
setPageVisibility("hidden");
} else if ('interactive' == document.readyState) {
// when document has finished loading and the document has been parsed, we can start changing the styles
setPage();
} else if ('complete' == document.readyState) {
// after the document is finished we can set the whole page back to `visible`
setPageVisibility("visible")
}
//##################---main_function---######################################
// function to change the all the elements on a page to desired color
function setPage() {
'use strict';
// General idea is to put all elements on a wikipedia page to an array `allElements`
// traverse through this array and reverse the color of each element accordingly
// running time o(n), where n is the number of elements on a page
// get all elements in the document, use to be `getElementsByTagName('*')`
// However `querySelectorAll()` seems to be faster
var allElements = document.querySelectorAll('*');
// loop over all elements on the page
for (var i = 0; i < allElements.length; i++) {
var currentElement = allElements[i];
// exception handler
try {
// check for images
if (currentElement.nodeName.toLowerCase() == 'img') {
// check current image
checkImage(currentElement);
continue;
}
// check for wiki logo
else if (currentElement.className.toLowerCase().includes("mw-wiki-logo")) {
invertImage(currentElement, 90);
continue;
}
// check for keyboard-key
else if (currentElement.className.toLowerCase().includes('keyboard-key')) {
currentElement.style.foregroundColor = default_backgroundColor;
continue;
}
// check for legends and pie charts
else if (currentElement.className.toLowerCase().includes('legend') ||
currentElement.className.toLowerCase().includes('border') ||
currentElement.style.borderColor.toLowerCase().includes('transparent')) {
continue;
}
// get the foreground color of the `currentElement`, using `getComputedStyle` will return the actual showing
// color of the given element in `rgb` format. However, this method seems to need the document first be loaded
// after returning the computed style. Hence, to get around, we hide the entire page while waiting the document
// to load, then un-hide after finished.
var foregroundColor = window.getComputedStyle(currentElement, null).getPropertyValue("color");
var backgroundColor = window.getComputedStyle(currentElement, null).getPropertyValue("background-color");
// temporary helper variables
var r, g, b;
// split the `default_backgroundColor` string to array of RGB values.
var default_backgroundColor_array = default_backgroundColor.match(/rgb\((\d{1,3}), (\d{1,3}), (\d{1,3})\)/);
// check if the `foregroundColor` is of type RGB value.
if (foregroundColor.match(/rgb\((\d{1,3}), (\d{1,3}), (\d{1,3})\)/)) {
// split color to RGB values.
foregroundColor = foregroundColor.match(/rgb\((\d{1,3}), (\d{1,3}), (\d{1,3})\)/);
// inverse color
r = 255 - foregroundColor[1];
g = 255 - foregroundColor[2];
b = 255 - foregroundColor[3];
// checking contrast between foregroundColor of `currentElement` and the `default_backgroundColor`
// make sure the contrast is high enough to ensure a decent viewing experience.
while (contrast([r, g, b], [default_backgroundColor_array[1], default_backgroundColor_array[2], default_backgroundColor_array[3]]) <
default_contrastValue) {
// increase each value by 30 each loop, i.e., increase the brightness of the current color
r = r + 30;
g = g + 30;
b = b + 30;
}
// set color
currentElement.style.color = 'rgb(' + r + ', ' + g + ', ' + b + ')';
} else {
// set default color
currentElement.style.color = default_foregroundColor;
}
// check if the `backgroundColor` is of type RGB value.
if (backgroundColor.match(/rgb\((\d{1,3}), (\d{1,3}), (\d{1,3})\)/)) {
// split color to RGB values.
backgroundColor = backgroundColor.match(/rgb\((\d{1,3}), (\d{1,3}), (\d{1,3})\)/);
// inverse color
r = 255 - backgroundColor[1];
g = 255 - backgroundColor[2];
b = 255 - backgroundColor[3];
// for the background color one would not check for contrast, instead we increase the brightness of `backgroundColor`
// if it is too dark, providing a comforting reading experience.
if (r < default_backgroundColor_array[1] - 10 && g < default_backgroundColor_array[2] - 10 && g < default_backgroundColor_array[3] - 10) {
r = r + 30;
g = g + 30;
b = b + 30;
}
// if the background is too bright, we decrease the brightness of `backgroundColor`
while (contrast([r, g, b], [default_backgroundColor_array[1], default_backgroundColor_array[2], default_backgroundColor_array[3]]) >
default_contrastValue) {
r = r - 30;
g = g - 30;
b = b - 30;
}
// set color
currentElement.style.backgroundColor = 'rgb(' + r + ', ' + g + ', ' + b + ')';
} else {
// set default color
currentElement.style.backgroundColor = default_backgroundColor;
}
} catch (e) {
// print any exception messages
console.log(e);
}
}
}
//##################---helper_functions---###################################
// helper function to set the visibility of a html page
function setPageVisibility(visibility) {
// get the entire html page
var EntirePage = document.getElementsByTagName('html')[0];
// set the page's background color to `default_backgroundColor`
EntirePage.style.backgroundColor = default_backgroundColor;
EntirePage.style.visibility = visibility;
}
// helper function to calculate the luminance of given `r`, `g`, `b` value
function luminance(r, g, b) {
var a = [r, g, b].map(function (v) {
v /= 255;
return v <= 0.03928 ? v / 12.92 : Math.pow((v + 0.055) / 1.055, 2.4);
});
return a[0] * 0.2126 + a[1] * 0.7152 + a[2] * 0.0722;
}
// helper function to calculate the contrast of two given color `rgb1` and `rgb2`
function contrast(rgb1, rgb2) {
return (luminance(rgb1[0], rgb1[1], rgb1[2]) + 0.05) / (luminance(rgb2[0], rgb2[1], rgb2[2]) + 0.05);
}
// helper function to check given source link has contain any substring specified in the list
function checkImage(element) {
// list of tags of the wikipedia logos and symbols to be excluded from setting backgroundColor to white
// list is subject to amend
var exclude_src_tag = [
"protection-shackle", "green_check", "symbol_support_vote",
"edit-clear", "information_icon", "increase2", "decrease_positive",
"steady2", "decrease2", "increase_negative", "red_question_mark",
"blue_check", "x_mark", "yes_check", "twemoji", "walnut", "cscr-featured",
"sound-openclipart", "folder_hexagonal_icon", "symbol_book_class2",
"question_book-new", "wiktionary-logo", "commons-logo", "wikinews-logo",
"wikiquote-logo", "wikivoyage-logo", "sound-icon", "wikibooks-logo",
"wikiversity-logo", "ambox", "system-search", "split-arrows", "wikiversity_logo",
"wikisource-logo", "wikimedia_community_logo", "wikidata-logo", "mediawiki-logo",
"wikispecies-logo", "blue_pencil", "nuvola_apps", "white_flag_icon",
"wiki_letter_w_cropped", "edit-copy_purple-wikiq", "acap", "portal-puzzle",
"star_of_life", "disambig-dark", "gnome", "office-book", "audio-input-microphone",
"hsutvald2", "hspolitic", "hsdagensdatum", "hsvissteduatt", "pl_wiki_aktualnosci_ikona",
"hsbild", "wiki_aktualnosci_ikona", "hs_vdq", "hssamarbete", "hswpedia", "w-circle",
"red_pencil_icon"
];
// list of tags of images to have color inverted
var invert_src_tag = [
"loudspeaker", "signature", "signatur", "chinese_characters", "/media/math/render/",
"translation_to_english_arrow", "disambig_gray", "wikimedia-logo_black"
];
// loop over the `exclude_src_tag` list to set background color
for (var i = 0; i < exclude_src_tag.length; i++) {
if (element.src.toLowerCase().includes(exclude_src_tag[i])) {
// element is in the list, stop looping
break;
}
}
// i equals list's length implies the element is not in the list
if (i == exclude_src_tag.length) {
// if element is not in the list, set the background color to white
element.style.backgroundColor = "rgb(255, 255, 255)";
}
// loop over the `invert_src_tag` list to invert image color
for (var j = 0; j < invert_src_tag.length; j++) {
if (element.src.toLowerCase().includes(invert_src_tag[j])) {
// invert image if element is in the list
// invert 86 per cent in order to match the background color
invertImage(element, 86);
break;
}
}
}
// helper function to invert a image to desired percentage
function invertImage(img, percent) {
// invert images by adding a filter tag
img.style.filter = "invert(" + percent + "%)";
}
})();