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CSS rules utilities

functions allowing to get the CSS rules applied to an element

Fra og med 27.01.2020. Se den nyeste version.

Dette script bør ikke installeres direkte. Det er et bibliotek, som andre scripts kan inkludere med metadirektivet // @require https://updategreasyfork.deno.dev/scripts/394970/768130/CSS%20rules%20utilities.js 

// ==UserScript==
// @name         CSS rules utilities
// @namespace    http://tampermonkey.net/
// @version      0.3
// @description  functions allowing to get the CSS rules applied to an element
// @author       CoStiC
// @match        *://*/*
// @grant        none
// ==/UserScript==

function findCssRules(el) {
    var sheets = document.styleSheets, ret = [];
    el.matches = el.matches || el.webkitMatchesSelector || el.mozMatchesSelector || el.msMatchesSelector || el.oMatchesSelector;
    for (var i in sheets) {
        var rules = sheets[i].rules || sheets[i].cssRules;
        for (var r in rules) {
            if (el.matches(rules[r].selectorText)) {
                ret.push(rules[r].cssText);
            }
        }
    }
    return ret;
}

function modCssRules(el, newRule, frDoc) {
    if (!frDoc) frDoc = window.document;
    var elHover = "";
    var sheets = frDoc.styleSheets;
    if (el !== null) {
        el.matches = el.matches || el.webkitMatchesSelector || el.mozMatchesSelector || el.msMatchesSelector || el.oMatchesSelector;
        for (var sheet in sheets) {
            var rules = sheets[sheet].rules || sheets[sheet].cssRules;
            for (var rule in rules) {
                if (rules[rule].type === 1) {
                    if (el.matches(rules[rule].selectorText)) {

                        let oldRulesList = rules[rule].style.cssText,
                            oldRules = oldRulesList.split(";"),
                            newRulesList = "";
                        oldRules.pop();

                        for (let newProp in newRule.cssNormal) {
                            el.style[newProp] = newRule.cssNormal[newProp];
                            for (let oldRule of oldRules) {
                                oldRule = oldRule.trim();
                                let oldProp = oldRule.split(":")[0];
                                if (oldProp === newProp) {
                                    newRulesList += newProp + ":" + newRule.cssNormal[newProp] + ";";
                                    el.style[newProp] = newRule.cssNormal[newProp];
                                } else {
                                    newRulesList += oldRule + ";";
                                };
                            }
                            rules[rule].style.cssText = newRulesList;
                        }

                        if (typeof newRule.cssHover !== 'undefined') {
                            var rul = "";
                            for (let propHover in newRule.cssHover) {
                                rul += `${propHover}:${newRule.cssHover[propHover]} !important;`;
                            };
                            elHover = `${rules[rule].selectorText}:hover{${rul}}`;
                        }
                    } else {};
                }
            }
        }
    }

    if (elHover !== "") {
        let newHoverStyle = document.createElement('style'),
            hoverRule = document.createTextNode(elHover);
        newHoverStyle.appendChild(hoverRule);
        document.head.appendChild(newHoverStyle)
        //sheets[sheets.length - 1].insertRule(elHover);
    };
}