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siavoshkc / White background replacer

// ==UserScript==
// @name         White background replacer
// @namespace    http://siavoshkc.ir/
// @version      0.9
// @description  Replaces the background white color with yellow in order to decrease eye strain
// @author       siavoshkc
// @include      *
// @grant        none
// @license      MIT
// @run-at       document-idle
// ==/UserScript==

function changeColor() {
    'use strict';
    const BG_COLOR = "#ffedc4";
    if(document.styleSheets.length == 0) document.body.style.backgroundColor = BG_COLOR;
    else
    {
        for (let sheeti= 0; sheeti<document.styleSheets.length; sheeti++) {
            try{
                let sheet= document.styleSheets[sheeti];
                let rules= sheet.cssRules;

                for (let rulei= 0; rulei<rules.length; rulei++) {
                    let rule= rules[rulei];
                    if (rule.type==CSSRule.STYLE_RULE)
                    {

                        if((rule.style.backgroundImage==undefined || rule.style.backgroundImage=="") && (rule.style.backgroundColor=="white"||rule.style.backgroundColor=="#ffffff"||rule.style.backgroundColor=="#FFFF"||rule.style.backgroundColor=="#FFF"||rule.style.backgroundColor=="#fff" ||rule.style.backgroundColor=="rgb(255, 255, 255)")) rule.style.backgroundColor=BG_COLOR;
                       // else if((rule.style.backgroundImage==undefined || rule.style.backgroundImage=="") && (rule.style.backgroundColor==undefined || rule.style.backgroundColor=="")) rule.style.backgroundColor=BG_COLOR;

                    }
                    else if(rule.type==CSSRule.IMPORT_RULE)
                    {
                        let importRules = rule.styleSheet.cssRules;
                        for(let importRulei = 0; importRulei < importRules.length; importRulei++)
                        {
                            let importRule = importRules[importRulei];
                            if((importRule.style.backgroundImage==undefined || importRule.style.backgroundImage=="") && (importRule.style.backgroundColor=="white"||importRule.style.backgroundColor=="#ffffff"||importRule.style.backgroundColor=="#FFFF"||importRule.style.backgroundColor=="#FFF"||importRule.style.backgroundColor=="#fff" ||importRule.style.backgroundColor=="rgb(255, 255, 255)")) importRule.style.backgroundColor=BG_COLOR;
                           // else if((importRule.style.backgroundImage==undefined || importRule.style.backgroundImage=="") && (importRule.style.backgroundColor==undefined || importRule.style.backgroundColor=="")) importRule.style.backgroundColor=BG_COLOR;
                        }

                    }
                    else if(rule.type==CSSRule.MEDIA_RULE)
                    {
                        let mediaRules = rule.cssRules;
                        for(let mediaRulei = 0; mediaRulei < mediaRules.length; mediaRulei++)
                        {
                            let mediaRule = mediaRules[mediaRulei];
                            if((mediaRule.style.backgroundImage==undefined || mediaRule.style.backgroundImage=="") && (mediaRule.style.backgroundColor=="white"||mediaRule.style.backgroundColor=="#ffffff"||mediaRule.style.backgroundColor=="#FFFF"||mediaRule.style.backgroundColor=="#FFF"||mediaRule.style.backgroundColor=="#fff" ||mediaRule.style.backgroundColor=="rgb(255, 255, 255)")) mediaRule.style.backgroundColor=BG_COLOR;
                           // else if((mediaRule.style.backgroundImage==undefined || mediaRule.style.backgroundImage=="") && (mediaRule.style.backgroundColor==undefined || mediaRule.style.backgroundColor=="")) mediaRule.style.backgroundColor=BG_COLOR;

                        }
                    }
                    else {console.log("Unsupported style rule of type: ".concat(rule.type))};
                }
            }
            catch(e)
            {
                console.log("Caught exception: ".concat(e));
                continue;
            }
        }
    }

};
changeColor() ;