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/**
 * Module dependencies.
 */

var parseuri = require('parseuri');
var debug = require('debug')('socket.io-client:url');

/**
 * Module exports.
 */

module.exports = url;

/**
 * URL parser.
 *
 * @param {String} url
 * @param {Object} An object meant to mimic window.location.
 *                 Defaults to window.location.
 * @api public
 */

function url (uri, loc) {
  var obj = uri;

  // default to window.location
  loc = loc || (typeof location !== 'undefined' && location);
  if (null == uri) uri = loc.protocol + '//' + loc.host;

  // relative path support
  if ('string' === typeof uri) {
    if ('/' === uri.charAt(0)) {
      if ('/' === uri.charAt(1)) {
        uri = loc.protocol + uri;
      } else {
        uri = loc.host + uri;
      }
    }

    if (!/^(https?|wss?):\/\//.test(uri)) {
      debug('protocol-less url %s', uri);
      if ('undefined' !== typeof loc) {
        uri = loc.protocol + '//' + uri;
      } else {
        uri = 'https://' + uri;
      }
    }

    // parse
    debug('parse %s', uri);
    obj = parseuri(uri);
  }

  // make sure we treat `localhost:80` and `localhost` equally
  if (!obj.port) {
    if (/^(http|ws)$/.test(obj.protocol)) {
      obj.port = '80';
    } else if (/^(http|ws)s$/.test(obj.protocol)) {
      obj.port = '443';
    }
  }

  obj.path = obj.path || '/';

  var ipv6 = obj.host.indexOf(':') !== -1;
  var host = ipv6 ? '[' + obj.host + ']' : obj.host;

  // define unique id
  obj.id = obj.protocol + '://' + host + ':' + obj.port;
  // define href
  obj.href = obj.protocol + '://' + host + (loc && loc.port === obj.port ? '' : (':' + obj.port));

  return obj;
}