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White background replacer

Replaces the background white color with a darker one in order to decrease eye strain

目前为 2023-08-25 提交的版本，查看 最新版本。

'use strict';
// ==UserScript==
// @name         White background replacer
// @namespace    http://siavoshkc.com/
// @version      2.6
// @description  Replaces the background white color with a darker one in order to decrease eye strain
// @author       siavoshkc
// @match        *://*/*
// @grant        none
// @license      MIT
// @run-at       document-idle
// ==/UserScript==

const goodBgColors = ["#b0edc4", "#79d2a6", "#80e5ff", "#79C664", "#64C6B6","#4DD7C0","#B1CE61", "#61CEB2", "#66C0A9",
                      "#6BA6D2", "#4295D3", "#7190DB", "#009900", "#6666ff","#e29d9d", "#7FD7D9", "#7FD997", "#87D97F",
                      "#D9BD7F", "#DDA279", "#73CA70", "#7092CA", "#7CCA70", "#ACCA70,", "#ffffb3", "#70CA82", "#c4e87d"]
const INTERVAL = 120000
var currentGoodBgColor = 0

function isWhite(bg) {
    const rgb = bg.match(/[0-9]+/g);
    const hsl = bg.match(/hsl\(\s*(\d+)\s*,\s*(\d+(?:\.\d+)?%)\s*,\s*(\d+(?:\.\d+)?%)\)/)
    return (
        bg == "white"||
        bg == "#ffffff"||
        bg == "#FFFF"||
        bg == "#FFF"||
        bg == "#fff"||
        bg == "#fdfdfd" ||
        (hsl && Number(hsl[3].replace('%','')) > 89) ||
        (rgb && rgb[0] > 230 && rgb[1] > 230 && rgb[2] >230)
    );
}

function changeColor(style) {
    console.debug("White background replacer: Trying to change background color ", style.backgroundColor)
    style.backgroundColor = goodBgColors[currentGoodBgColor % goodBgColors.length]
    console.debug("White background replacer: Changing one style background-color to ", goodBgColors[currentGoodBgColor % goodBgColors.length])
    if(style.color == style.backgroundColor) style.color = "black"
    if(currentGoodBgColor === Number.MAX_SAFE_INTEGER) currentGoodBgColor = 0
    else currentGoodBgColor++
    setTimeout(changeColor, INTERVAL, style)
}

function iterateRules(cssRules) {
    if(!cssRules) return

    for (let rule of cssRules) {
        try {
            if(checkStyle(rule?.style)){
                changeColor(rule?.style)
            }
            iterateRules(rule.cssRules)
        } catch(e) {
            console.warn("WBR: Caught exception: ", e)
        }

    }
}

function checkStyle(style) {
    if(!style) return
    return (
        isWhite(style.background) ||
        isWhite(style.backgroundColor) ||
        isWhite(style.getPropertyValue('--bg')) ||
        isWhite(style.getPropertyValue('--bg-color')) ||
        isWhite(style.getPropertyValue('--background-color')) ||
        isWhite(style.getPropertyValue('--background')) ||
        isWhite(style.getPropertyValue('--lighting-color')) ||
        isWhite(style.getPropertyValue('--theme-background-color')) ||
        isWhite(style.getPropertyValue('--theme-content-background-color'))
    )
}

function checkPage() {
    console.debug("White background replacer: Running...", window.getComputedStyle(document.documentElement));

    if(checkStyle(window.getComputedStyle(document.documentElement))){
        console.debug("Global background detected")
        //changeColor(document.body.style)
        try {
            var all = document.styleSheets,
                s = all[all.length - 1],
                l = s.cssRules.length;
            console.debug("insertRule", s.insertRule)
            if (s.insertRule) {

                s.insertRule('#content {background-color: DarkGrey !important}', l)
                console.debug("Global rule inserted")
            }
        } catch(e) {
            console.debug("WBR: Caught exception: ", e)
            const s = document.createElement('style');
            s.innerHTML = '#content {background-color: Tan !important;}';
            document.body.appendChild(s);
            console.debug("Global element appended")
        }
    }
    if(document.styleSheets?.length > 0) {
        for (let sheet of document.styleSheets) {
            try {
                iterateRules(sheet.cssRules)
            } catch(e) {
                console.warn("WBR: Caught exception: ", e)

            }
        }
    }
}
checkPage()