Spec filtering for Jasmine

specFilter.js

/**
 * Determines if the given jasmine spec should run based on whether it's highest
 * level suite desciption match the value of the runMatch parameter in the url.
 *
 * @param {Spec} spec Jasmine spec object that is about to be executed.
 *
 * @returns {Boolean} True if spec should run, false if it should be skipped.
 */
var specFilter = function(spec){
    /**
     * @param {String} name Key of the value to be retrieved from the url.
     *
     * @returns {Object} Value of the requested key or undefined if the key does
     *     not exist in the url.
     */
    var getQueryParam = function(name){
        var pairs = window.location.search.slice(1).split('&');

        for (key in pairs){
            var arr = pairs[key].split('=');

            if (arr[0] === name)
                return decodeURIComponent(arr[1].replace(/\+/g, " "));
        }
    }

    var val = getQueryParam('runMatch') || '';

    // Find the outermost suite this spec belongs to.
    var suite = spec.suite;
    while (suite.parentSuite) suite = suite.parentSuite;

    return suite.description.toLowerCase().indexOf(val.toLowerCase()) !== -1;
};