luhn-generator/update/node_modules/axe-core/lib/checks/language/has-lang-evaluate.js

A generator of numbers that passes the validation of Luhn algorithm or Luhn formula, also known as the 'modulus 10' or 'mod 10' algorithm

import { isXHTML } from '../../core/utils';

function hasValue(value) {
	return (value || '').trim() !== '';
}

function hasLangEvaluate(node, options, virtualNode) {
	// special case when xml:lang has a value and lang does not
	// but the document is not XHTML
	if (
		options.attributes.includes('xml:lang') &&
		options.attributes.includes('lang') &&
		hasValue(virtualNode.attr('xml:lang')) &&
		!hasValue(virtualNode.attr('lang')) &&
		!isXHTML(document)
	) {
		this.data({
			messageKey: 'noXHTML'
		});
		return false;
	}

	const hasLang = options.attributes.some(name => {
		return hasValue(virtualNode.attr(name));
	});

	if (!hasLang) {
		this.data({
			messageKey: 'noLang'
		});
		return false;
	}

	return true;
}

export default hasLangEvaluate;