index.mjs
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function cssHasPseudo(document) {
const observedItems = []; // document.createAttribute() doesn't support `:` in the name. innerHTML does
const attributeElement = document.createElement('x'); // walk all stylesheets to collect observed css rules
[].forEach.call(document.styleSheets, walkStyleSheet);
transformObservedItems(); // observe DOM modifications that affect selectors
const mutationObserver = new MutationObserver(mutationsList => {
mutationsList.forEach(mutation => {
[].forEach.call(mutation.addedNodes || [], node => {
// walk stylesheets to collect observed css rules
if (node.nodeType === 1 && node.sheet) {
walkStyleSheet(node.sheet);
}
}); // transform observed css rules
cleanupObservedCssRules();
transformObservedItems();
});
});
mutationObserver.observe(document, {
childList: true,
subtree: true
}); // observe DOM events that affect pseudo-selectors
document.addEventListener('focus', transformObservedItems, true);
document.addEventListener('blur', transformObservedItems, true);
document.addEventListener('input', transformObservedItems); // transform observed css rules
function transformObservedItems() {
requestAnimationFrame(() => {
observedItems.forEach(item => {
const nodes = [];
[].forEach.call(document.querySelectorAll(item.scopeSelector), element => {
const nthChild = [].indexOf.call(element.parentNode.children, element) + 1;
const relativeSelectors = item.relativeSelectors.map(relativeSelector => item.scopeSelector + ':nth-child(' + nthChild + ') ' + relativeSelector).join(); // find any relative :has element from the :scope element
const relativeElement = element.parentNode.querySelector(relativeSelectors);
const shouldElementMatch = item.isNot ? !relativeElement : relativeElement;
if (shouldElementMatch) {
// memorize the node
nodes.push(element); // set an attribute with an irregular attribute name
// document.createAttribute() doesn't support special characters
attributeElement.innerHTML = '<x ' + item.attributeName + '>';
element.setAttributeNode(attributeElement.children[0].attributes[0].cloneNode()); // trigger a style refresh in IE and Edge
document.documentElement.style.zoom = 1;
document.documentElement.style.zoom = null;
}
}); // remove the encoded attribute from all nodes that no longer match them
item.nodes.forEach(node => {
if (nodes.indexOf(node) === -1) {
node.removeAttribute(item.attributeName); // trigger a style refresh in IE and Edge
document.documentElement.style.zoom = 1;
document.documentElement.style.zoom = null;
}
}); // update the
item.nodes = nodes;
});
});
} // remove any observed cssrules that no longer apply
function cleanupObservedCssRules() {
[].push.apply(observedItems, observedItems.splice(0).filter(item => item.rule.parentStyleSheet && item.rule.parentStyleSheet.ownerNode && document.documentElement.contains(item.rule.parentStyleSheet.ownerNode)));
} // walk a stylesheet to collect observed css rules
function walkStyleSheet(styleSheet) {
try {
// walk a css rule to collect observed css rules
[].forEach.call(styleSheet.cssRules || [], rule => {
if (rule.selectorText) {
// decode the selector text in all browsers to:
// [1] = :scope, [2] = :not(:has), [3] = :has relative, [4] = :scope relative
const selectors = decodeURIComponent(rule.selectorText.replace(/\\(.)/g, '$1')).match(/^(.*?)\[:(not-)?has\((.+?)\)\](.*?)$/);
if (selectors) {
const attributeName = ':' + (selectors[2] ? 'not-' : '') + 'has(' + // encode a :has() pseudo selector as an attribute name
encodeURIComponent(selectors[3]).replace(/%3A/g, ':').replace(/%5B/g, '[').replace(/%5D/g, ']').replace(/%2C/g, ',') + ')';
observedItems.push({
rule,
scopeSelector: selectors[1],
isNot: selectors[2],
relativeSelectors: selectors[3].split(/\s*,\s*/),
attributeName,
nodes: []
});
}
} else {
walkStyleSheet(rule);
}
});
} catch (error) {
/* do nothing and continue */
}
}
}
export default cssHasPseudo;
//# sourceMappingURL=index.mjs.map