'use strict';

/* --------------------------------------------------------------
 url_arguments.js 2016-05-23
 Gambio GmbH
 http://www.gambio.de
 Copyright (c) 2016 Gambio GmbH
 Released under the GNU General Public License (Version 2)
 [http://www.gnu.org/licenses/gpl-2.0.html]
 --------------------------------------------------------------
 */

jse.libs.url_arguments = jse.libs.url_arguments || {};

/**
 * ## URL Arguments Library
 *
 * This library is created to help coding when values of URL are required.
 *
 * @module JSE/Libs/url_arguments
 * @exports jse.libs.url_arguments
 */
(function (exports) {

    'use strict';

    /**
     * Returns all URL parameters from the provided URL.
     *
     * @param {string} url (optional) The URL to be parsed. If not provided the current location will be used.
     *
     * @return {object} Returns an object that contains the parameters in key-value pairs.
     *
     * @deprecated Use the $.deparam method which can better parse the GET parameters.
     */

    exports.getUrlParameters = function (url) {
        var parameters = {},
            search = url ? url.replace(/.*\?/, '') : location.search.substring(1),
            result;

        if (search === null || search === '') {
            return parameters;
        }

        result = search.split('&');

        for (var i = 0; i < result.length; i++) {
            var tmp = result[i].split('=');
            parameters[tmp[0]] = tmp[1];
        }

        return parameters;
    };

    /**
     * Returns the current filename.
     *
     * @returns string Current filename.
     */
    exports.getCurrentFile = function () {
        var urlArray = window.location.pathname.split('/');
        return urlArray[urlArray.length - 1];
    };

    /**
     * Replaces a specific parameter value inside an URL.
     *
     * @param url The URL containing the parameter.
     * @param parameter The parameter name to be replaced.
     * @param value The new value of the parameter.
     *
     * @returns {string} Returns the updated URL string.
     */
    exports.replaceParameterValue = function (url, parameter, value) {
        var regex = new RegExp('(' + parameter + '=)[^\&]+');

        url = url.replace(regex, '$1' + value);

        if (url.search(parameter + '=') === -1 && value !== undefined) {
            if (url.search(/\?/) === -1) {
                url += '?' + encodeURIComponent(parameter) + '=' + encodeURIComponent(value);
            } else if (url.substr(url.length - 1, 1) === '?') {
                url += encodeURIComponent(parameter) + '=' + encodeURIComponent(value);
            } else {
                url += '&' + encodeURIComponent(parameter) + '=' + encodeURIComponent(value);
            }
        }

        return url;
    };
})(jse.libs.url_arguments);
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