@atlassian/aui/src/js/aui/internal/enforcer.js

Atlassian User Interface library

import * as logger from './log';

function enforcer(element) {
    function attributeExists(attributeName) {
        var errorMessage = attributeName + " wasn't defined";

        return satisfiesRules(function () {
            return element.hasAttribute(attributeName);
        }, errorMessage);
    }

    function refersTo(attributeName) {
        if (!attributeExists(attributeName, element)) {
            return false;
        }

        var desiredId = element.getAttribute(attributeName);
        var errorMessage = 'an element with id set to "' + desiredId + '" was not found';

        return satisfiesRules(function () {
            return document.getElementById(desiredId);
        }, errorMessage);
    }

    function ariaControls() {
        return refersTo('aria-controls');
    }

    function ariaOwns() {
        return refersTo('aria-owns');
    }

    function satisfiesRules(predicate, message) {
        if (!predicate()) {
            if (element) {
                logger.error(message, element);
            } else {
                logger.error(message);
            }
            return false;
        }
        return true;
    }

    return {
        attributeExists: attributeExists,
        refersTo: refersTo,
        satisfiesRules: satisfiesRules,
        ariaControls: ariaControls,
        ariaOwns: ariaOwns,
    };
}

export default enforcer;