luhn-generator/update/node_modules/axe-core/lib/commons/aria/get-explicit-role.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 isValidRole from './is-valid-role';
import { getNodeFromTree, tokenList } from '../../core/utils';
import AbstractVirtuaNode from '../../core/base/virtual-node/abstract-virtual-node';

function getExplicitRole(vNode, { fallback, abstracts, dpub } = {}) {
	vNode = vNode instanceof AbstractVirtuaNode ? vNode : getNodeFromTree(vNode);

	if (vNode.props.nodeType !== 1) {
		return null;
	}

	const roleAttr = (vNode.attr('role') || '').trim().toLowerCase();
	const roleList = fallback ? tokenList(roleAttr) : [roleAttr];

	// Get the first valid role:
	const firstValidRole = roleList.find(role => {
		if (!dpub && role.substr(0, 4) === 'doc-') {
			return false;
		}
		return isValidRole(role, { allowAbstract: abstracts });
	});

	return firstValidRole || null;
}

export default getExplicitRole;