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Dumps the Computed CSS stylesheet of an element and it's children for diff use.
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var simmer = Simmer.noConflict();
/* dump-css MIT 2020 */
// Don't emit CSS for any rule specified here
const ruleDenylist = [
'inline-size',
'perspective-origin',
'transform-origin'
];
// Don't emit CSS for any vendor prefixed rule (starting with a dash)
const denyVendorPrefix = true;
// Don't emit CSS for the root element
const skipRootElement = true;
// Cache simmer paths and parent CSS rules
var cacheContainer = {
'cache': {}
}
function getElementCSS(rootElement, targetElement) {
// Get the computed CSS of the targetElement
// CSS that is identical to a parent is discarded
// Parent searching stops at the rootElement.
let cache = cacheContainer.cache;
let computedStyle = window.getComputedStyle(targetElement);
let targetElementStyle = {};
for (let ruleName of computedStyle) {
if (denyVendorPrefix && ruleName[0] == '-') continue;
if (ruleDenylist && ruleDenylist.includes(ruleName)) continue;
targetElementStyle[ruleName] = computedStyle[ruleName];
}
let searchPath = targetElement.parentPath;
let searchElement = undefined;
do {
let searchCacheEntry = cache[searchPath];
if (!searchCacheEntry) return targetElementStyle;
searchElement = searchCacheEntry.element;
let searchCss = searchCacheEntry.css;
for (let styleName in searchCss) {
if (targetElementStyle[styleName] == searchCss[styleName]) {
delete targetElementStyle[styleName];
}
}
searchPath = searchElement.parentPath;
} while (searchPath && searchElement != rootElement);
return targetElementStyle;
}
function dumpCSS(rootElement) {
let elementStack = [rootElement];
let cache = cacheContainer.cache;
let cacheOrder = [];
while (elementStack.length) {
let element = elementStack.shift();
let elementPath = element.elementPath = simmer(element);
let children = Array.apply(null, element.children);
children.forEach(child => child.parentPath = elementPath);
if (children.length) {
elementStack.push(...children);
}
cacheOrder.push(elementPath);
cache[elementPath] = {
element: element,
css: getElementCSS(rootElement, element)
};
}
if (skipRootElement) cacheOrder.shift();
let generatedStylesheetTable = [];
for (let elementPath of cacheOrder) {
let elementCacheEntry = cache[elementPath];
if (!elementCacheEntry) continue;
let elementCss = elementCacheEntry.css;
if (Object.keys(elementCss).length) { // It's possible there could be no CSS rules for this element, and we wouldn't want to emit it.
generatedStylesheetTable.push(elementPath + " {");
for (let ruleName in elementCss) {
generatedStylesheetTable.push(' ' + ruleName + ': ' + elementCss[ruleName] + ';');
}
generatedStylesheetTable.push("}");
}
}
return generatedStylesheetTable.join('\n');
}
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