querystringparser/js/querystringserializer.js

Extremely fast querystring parser

/**
 * Copyright (c) 2013 Petka Antonov
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:</p>
 * 
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */
"use strict";
module.exports = QueryStringSerializer;
var enc = encodeURIComponent;
var ARRAY = [];
var isArray = Array.isArray;
var getProto = Object.getPrototypeOf;
var oProto = getProto({});

function isObject(obj) {
    if (isArray(obj)) {
        return true;
    }
    if (obj === null || typeof obj !== "object") {
        return false;
    }
    var proto = getProto(obj);

    return proto === oProto || proto === null;
}

function QueryStringSerializer() {

}

QueryStringSerializer.prototype.serialize =
function QueryStringSerializer$serialize(obj) {
    if (obj === null ||
        typeof obj !== "object") {
        throw new TypeError("the obj to stringify must be an object");
    }
    var keys = Object.keys(obj);
    var len = keys.length;
    var array = ARRAY;
    var stack = [];
    var ret = [];
    var cur = obj;
    var keyPrefix = "";

    for (var i = 0; i < len; ++i) {
        var key = keys === array ? i : keys[i];
        var value = cur[key];
        if (isObject(value)) {
            stack.push(keyPrefix, cur, keys, len, i);

            if (keyPrefix === "") {
                keyPrefix = key;
            }
            else {
                keyPrefix = keyPrefix + "[" + enc(key) + "]";
            }

            if (isArray(value)) {
                keys = array;
                len = value.length;
            }
            else {
                keys = Object.keys(value);
                len = keys.length;
            }
            i = -1;
            cur = value;
        }
        else {
            if (typeof value !== "string") {
                value = "" + value;
            }

            var serializedKey = keyPrefix === ""
                                ? enc(key)
                                : keyPrefix + "[" + enc(key) + "]";
            ret.push(serializedKey + "=" + enc(value));
        }

        if(i === len - 1 && stack.length > 0) {
            i = stack.pop();
            len = stack.pop();
            keys = stack.pop();
            cur = stack.pop();
            keyPrefix = stack.pop();
        }
    }

    return ret.join("&");
};