/*!
   * express
   * Copyright(c) 2009-2013 TJ Holowaychuk
   * Copyright(c) 2013 Roman Shtylman
   * Copyright(c) 2014-2015 Douglas Christopher Wilson
   * MIT Licensed
   */
  
  'use strict';
  
  /**
   * Module dependencies.
   */
  
  var merge = require('utils-merge')
  var parseUrl = require('parseurl');
  var qs = require('qs');
  
  /**
   * @param {Object} options
   * @return {Function}
   * @api public
   */
  
  module.exports = function query(options) {
    var opts = merge({}, options)
    var queryparse = qs.parse;
  
    if (typeof options === 'function') {
      queryparse = options;
      opts = undefined;
    }
  
    if (opts !== undefined && opts.allowPrototypes === undefined) {
      // back-compat for qs module
      opts.allowPrototypes = true;
    }
  
    return function query(req, res, next){
      if (!req.query) {
        var val = parseUrl(req).query;
        req.query = queryparse(val, opts);
      }
  
      next();
    };
  };