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C:/Program Files/iisnode/www/express/node_modules/qs/lib/_[ Not.Writable ]

File:C:/Program Files/iisnode/www/express/node_modules/qs/lib/querystring.js

/*!
 * querystring
 * Copyright(c) 2010 TJ Holowaychuk <tj@vision-media.ca>
 * MIT Licensed
 */

/**
 * Library version.
 */

exports.version = '0.3.1';

/**
 * Object#toString() ref for stringify().
 */

var toString = Object.prototype.toString;

/**
 * Cache non-integer test regexp.
 */

var notint = /[^0-9]/;

/**
 * Parse the given query `str`, returning an object.
 *
 * @param {String} str
 * @return {Object}
 * @api public
 */

exports.parse = function(str){
  if (null == str || '' == str) return {};

  function promote(parent, key) {
    if (parent[key].length == 0) return parent[key] = {};
    var t = {};
    for (var i in parent[key]) t[i] = parent[key][i];
    parent[key] = t;
    return t;
  }

  return String(str)
    .split('&')
    .reduce(function(ret, pair){
      try{ 
        pair = decodeURIComponent(pair.replace(/\+/g, ' '));
      } catch(e) {
        // ignore
      }

      var eql = pair.indexOf('=')
        , brace = lastBraceInKey(pair)
        , key = pair.substr(0, brace || eql)
        , val = pair.substr(brace || eql, pair.length)
        , val = val.substr(val.indexOf('=') + 1, val.length)
        , parent = ret;

      // ?foo
      if ('' == key) key = pair, val = '';

      // nested
      if (~key.indexOf(']')) {
        var parts = key.split('[')
          , len = parts.length
          , last = len - 1;

        function parse(parts, parent, key) {
          var part = parts.shift();

          // end
          if (!part) {
            if (Array.isArray(parent[key])) {
              parent[key].push(val);
            } else if ('object' == typeof parent[key]) {
              parent[key] = val;
            } else if ('undefined' == typeof parent[key]) {
              parent[key] = val;
            } else {
              parent[key] = [parent[key], val];
            }
          // array
          } else {
            obj = parent[key] = parent[key] || [];
            if (']' == part) {
              if (Array.isArray(obj)) {
                if ('' != val) obj.push(val);
              } else if ('object' == typeof obj) {
                obj[Object.keys(obj).length] = val;
              } else {
                obj = parent[key] = [parent[key], val];
              }
            // prop
            } else if (~part.indexOf(']')) {
              part = part.substr(0, part.length - 1);
              if(notint.test(part) && Array.isArray(obj)) obj = promote(parent, key);
              parse(parts, obj, part);
            // key
            } else {
              if(notint.test(part) && Array.isArray(obj)) obj = promote(parent, key);
              parse(parts, obj, part);
            }
          }
        }

        parse(parts, parent, 'base');
      // optimize
      } else {
        if (notint.test(key) && Array.isArray(parent.base)) {
          var t = {};
          for(var k in parent.base) t[k] = parent.base[k];
          parent.base = t;
        }
        set(parent.base, key, val);
      }

      return ret;
    }, {base: {}}).base;
};

/**
 * Turn the given `obj` into a query string
 *
 * @param {Object} obj
 * @return {String}
 * @api public
 */

var stringify = exports.stringify = function(obj, prefix) {
  if (Array.isArray(obj)) {
    return stringifyArray(obj, prefix);
  } else if ('[object Object]' == toString.call(obj)) {
    return stringifyObject(obj, prefix);
  } else if ('string' == typeof obj) {
    return stringifyString(obj, prefix);
  } else {
    return prefix;
  }
};

/**
 * Stringify the given `str`.
 *
 * @param {String} str
 * @param {String} prefix
 * @return {String}
 * @api private
 */

function stringifyString(str, prefix) {
  if (!prefix) throw new TypeError('stringify expects an object');
  return prefix + '=' + encodeURIComponent(str);
}

/**
 * Stringify the given `arr`.
 *
 * @param {Array} arr
 * @param {String} prefix
 * @return {String}
 * @api private
 */

function stringifyArray(arr, prefix) {
  var ret = [];
  if (!prefix) throw new TypeError('stringify expects an object');
  for (var i = 0; i < arr.length; i++) {
    ret.push(stringify(arr[i], prefix + '[]'));
  }
  return ret.join('&');
}

/**
 * Stringify the given `obj`.
 *
 * @param {Object} obj
 * @param {String} prefix
 * @return {String}
 * @api private
 */

function stringifyObject(obj, prefix) {
  var ret = []
    , keys = Object.keys(obj)
    , key;
  for (var i = 0, len = keys.length; i < len; ++i) {
    key = keys[i];
    ret.push(stringify(obj[key], prefix
      ? prefix + '[' + encodeURIComponent(key) + ']'
      : encodeURIComponent(key)));
  }
  return ret.join('&');
}

/**
 * Set `obj`'s `key` to `val` respecting
 * the weird and wonderful syntax of a qs,
 * where "foo=bar&foo=baz" becomes an array.
 *
 * @param {Object} obj
 * @param {String} key
 * @param {String} val
 * @api private
 */

function set(obj, key, val) {
  var v = obj[key];
  if (undefined === v) {
    obj[key] = val;
  } else if (Array.isArray(v)) {
    v.push(val);
  } else {
    obj[key] = [v, val];
  }
}

/**
 * Locate last brace in `str` within the key.
 *
 * @param {String} str
 * @return {Number}
 * @api private
 */

function lastBraceInKey(str) {
  var len = str.length
    , brace
    , c;
  for (var i = 0; i < len; ++i) {
    c = str[i];
    if (']' == c) brace = false;
    if ('[' == c) brace = true;
    if ('=' == c && !brace) return i;
  }
}

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