--- /dev/null
+'use strict';
+
+var hexTable = (function () {
+ var array = new Array(256);
+ for (var i = 0; i < 256; ++i) {
+ array[i] = '%' + ((i < 16 ? '0' : '') + i.toString(16)).toUpperCase();
+ }
+
+ return array;
+}());
+
+var has = Object.prototype.hasOwnProperty;
+
+exports.arrayToObject = function (source, options) {
+ var obj = options.plainObjects ? Object.create(null) : {};
+ for (var i = 0; i < source.length; ++i) {
+ if (typeof source[i] !== 'undefined') {
+ obj[i] = source[i];
+ }
+ }
+
+ return obj;
+};
+
+exports.merge = function (target, source, options) {
+ if (!source) {
+ return target;
+ }
+
+ if (typeof source !== 'object') {
+ if (Array.isArray(target)) {
+ target.push(source);
+ } else if (typeof target === 'object') {
+ if (options.plainObjects || options.allowPrototypes || !has.call(Object.prototype, source)) {
+ target[source] = true;
+ }
+ } else {
+ return [target, source];
+ }
+
+ return target;
+ }
+
+ if (typeof target !== 'object') {
+ return [target].concat(source);
+ }
+
+ var mergeTarget = target;
+ if (Array.isArray(target) && !Array.isArray(source)) {
+ mergeTarget = exports.arrayToObject(target, options);
+ }
+
+ return Object.keys(source).reduce(function (acc, key) {
+ var value = source[key];
+
+ if (has.call(acc, key)) {
+ acc[key] = exports.merge(acc[key], value, options);
+ } else {
+ acc[key] = value;
+ }
+ return acc;
+ }, mergeTarget);
+};
+
+exports.decode = function (str) {
+ try {
+ return decodeURIComponent(str.replace(/\+/g, ' '));
+ } catch (e) {
+ return str;
+ }
+};
+
+exports.encode = function (str) {
+ // This code was originally written by Brian White (mscdex) for the io.js core querystring library.
+ // It has been adapted here for stricter adherence to RFC 3986
+ if (str.length === 0) {
+ return str;
+ }
+
+ var string = typeof str === 'string' ? str : String(str);
+
+ var out = '';
+ for (var i = 0; i < string.length; ++i) {
+ var c = string.charCodeAt(i);
+
+ if (
+ c === 0x2D || // -
+ c === 0x2E || // .
+ c === 0x5F || // _
+ c === 0x7E || // ~
+ (c >= 0x30 && c <= 0x39) || // 0-9
+ (c >= 0x41 && c <= 0x5A) || // a-z
+ (c >= 0x61 && c <= 0x7A) // A-Z
+ ) {
+ out += string.charAt(i);
+ continue;
+ }
+
+ if (c < 0x80) {
+ out = out + hexTable[c];
+ continue;
+ }
+
+ if (c < 0x800) {
+ out = out + (hexTable[0xC0 | (c >> 6)] + hexTable[0x80 | (c & 0x3F)]);
+ continue;
+ }
+
+ if (c < 0xD800 || c >= 0xE000) {
+ out = out + (hexTable[0xE0 | (c >> 12)] + hexTable[0x80 | ((c >> 6) & 0x3F)] + hexTable[0x80 | (c & 0x3F)]);
+ continue;
+ }
+
+ i += 1;
+ c = 0x10000 + (((c & 0x3FF) << 10) | (string.charCodeAt(i) & 0x3FF));
+ out += (hexTable[0xF0 | (c >> 18)] + hexTable[0x80 | ((c >> 12) & 0x3F)] + hexTable[0x80 | ((c >> 6) & 0x3F)] + hexTable[0x80 | (c & 0x3F)]);
+ }
+
+ return out;
+};
+
+exports.compact = function (obj, references) {
+ if (typeof obj !== 'object' || obj === null) {
+ return obj;
+ }
+
+ var refs = references || [];
+ var lookup = refs.indexOf(obj);
+ if (lookup !== -1) {
+ return refs[lookup];
+ }
+
+ refs.push(obj);
+
+ if (Array.isArray(obj)) {
+ var compacted = [];
+
+ for (var i = 0; i < obj.length; ++i) {
+ if (typeof obj[i] !== 'undefined') {
+ compacted.push(obj[i]);
+ }
+ }
+
+ return compacted;
+ }
+
+ var keys = Object.keys(obj);
+ for (var j = 0; j < keys.length; ++j) {
+ var key = keys[j];
+ obj[key] = exports.compact(obj[key], refs);
+ }
+
+ return obj;
+};
+
+exports.isRegExp = function (obj) {
+ return Object.prototype.toString.call(obj) === '[object RegExp]';
+};
+
+exports.isBuffer = function (obj) {
+ if (obj === null || typeof obj === 'undefined') {
+ return false;
+ }
+
+ return !!(obj.constructor && obj.constructor.isBuffer && obj.constructor.isBuffer(obj));
+};