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Pure Dark theme for Wikipedia pages
当前为
// ==UserScript==
// @name Wikipedia Dark Theme
// @namespace https://github.com/MaxsLi/WikipediaDarkTheme
// @version 0.83
// @icon https://www.wikipedia.org/favicon.ico
// @description Pure Dark theme for Wikipedia pages
// @author Shangru Li
// @match *://*.wikipedia.org/*
// @grant none
// @run-at document-start
// ==/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---#########################
// 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")
}
// 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
var allElements = document.getElementsByTagName('*');
for (var i = 0; i < allElements.length; i++) {
var currentElement = allElements[i];
// exception handler
try {
// check for legends and pie charts
if (currentElement.className.toLowerCase().includes('legend') ||
currentElement.style.borderColor.toLowerCase().includes('transparent') ||
currentElement.className.toLowerCase().includes('border')) {
continue;
}
// check for wiki logo
else if (currentElement.className.toLowerCase().includes("mw-wiki-logo")) {
invertImage(currentElement, 90);
continue;
}
// check for math functions and expressions
else if (currentElement.className.toLowerCase().includes('mwe-math')) {
// invert the math expression images by setting a invert filter to 86% to match the background color
invertImage(currentElement, 86);
continue;
}
// check for keyboard-key
else if (currentElement.className.toLowerCase().includes('keyboard-key')) {
currentElement.style.background = default_backgroundColor;
continue;
}
else if (currentElement.nodeName.toLowerCase() == 'img') {
// check for signatures
if (currentElement.src.toLowerCase().includes('signature')) {
invertImage(currentElement, 100);
} else if (!check_exclude(currentElement)) {
currentElement.style.backgroundColor = "rgb(255, 255, 255)";
}
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 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 check_exclude(element) {
// list of tags of the wikipedia logos and symbols to be excluded
// list are 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_contradict", "Ambox_question", "System-search",
"Split-arrows", "Wikiversity_logo", "Wikisource-logo", "Wikimedia_Community_Logo",
"Wikidata-logo", "Mediawiki-logo", "Wikispecies-logo"
];
// loop over the list
for (var i = 0; i < exclude_src_tag.length; i++) {
if (element.src.includes(exclude_src_tag[i])) {
return true;
}
}
}
// helper function to invert a image to desired percentage
function invertImage(img, percent) {
img.style.filter = "invert(" + percent + "%)";
}
})();