define(function(require, exports) {
'use strict';

/**
 * Get the port of the url.
 * @param {string} url full url.
 * @return {?number} port number, null if none found.
 */
exports.getPort = function(url) {
  var parts = url.split(':');
  if (parts.length < 2) {
    return null;
  }

  // If we found a port and path, it's the last part
  var candidate = parts[parts.length - 1];
  parts = candidate.split('/');

  // If we found a port, it's the first part
  candidate = parts[0];
  if (!isInteger(candidate)) {
    return null;
  }

  return parseInt(candidate, 10);
};

/**
 * Get the scheme of the url. Note that this only detects http and https.
 * @param {string} url full url.
 * @return {?string} uri scheme (ie http), null if none found.
 */
exports.getScheme = function(url) {
  var parts = url.split(':');
  if (parts.length < 2) {
    return null;
  }


  // If we found a scheme, it's the first part
  var candidate = parts[0];
  if (candidate !== 'http' && candidate !== 'https') {
    return null;
  }

  return candidate;
};

/**
 * Decide whether or not this string represents an integer.
 * @param {string} str some string.
 * @param {boolean} whether or not str represents an integer.
 */
function isInteger(str) {
  return (/^\d+$/).test(str);
}

});