var QueryString = exports; 
var util = require('util'); 
function hasOwnProperty(obj, prop){ 
return Object.prototype.hasOwnProperty.call(obj, prop); 
} 
function charCode(c){ 
return c.charCodeAt(0); 
} 
QueryString.unescapeBuffer = function (s, decodeSpaces){ 
var out = new Buffer((_AN_Read_length('length', s))); 
var state = 'CHAR'; 
var n, m, hexchar; 
for (var inIndex = 0, outIndex = 0; 
inIndex <= _AN_Read_length('length', s); inIndex++ ){ 
var c = s.charCodeAt(inIndex); 
switch (state){ 
case 'CHAR': switch (c){ 
case charCode('%'): n = 0; 
m = 0; 
state = 'HEX0'; 
break ; 
case charCode('+'): if (decodeSpaces) c = charCode(' '); 
default : { 
out[outIndex++ ] = c; 
break ; 
} 
} 
break ; 
case 'HEX0': state = 'HEX1'; 
hexchar = c; 
if (charCode('0') <= c && c <= charCode('9')) { 
n = c - charCode('0'); 
} 
 else if (charCode('a') <= c && c <= charCode('f')) { 
n = c - charCode('a') + 10; 
} 
 else if (charCode('A') <= c && c <= charCode('F')) { 
n = c - charCode('A') + 10; 
} 
 else { 
out[outIndex++ ] = charCode('%'); 
out[outIndex++ ] = c; 
state = 'CHAR'; 
break ; 
} 
break ; 
case 'HEX1': state = 'CHAR'; 
if (charCode('0') <= c && c <= charCode('9')) { 
m = c - charCode('0'); 
} 
 else if (charCode('a') <= c && c <= charCode('f')) { 
m = c - charCode('a') + 10; 
} 
 else if (charCode('A') <= c && c <= charCode('F')) { 
m = c - charCode('A') + 10; 
} 
 else { 
out[outIndex++ ] = charCode('%'); 
out[outIndex++ ] = hexchar; 
out[outIndex++ ] = c; 
break ; 
} 
out[outIndex++ ] = 16 * n + m; 
break ; 
} 
} 
return out.slice(0, outIndex - 1); 
} 
; 
QueryString.unescape = function (s, decodeSpaces){ 
return QueryString.unescapeBuffer(s, decodeSpaces).toString(); 
} 
; 
QueryString.escape = function (str){ 
return encodeURIComponent(str); 
} 
; 
var stringifyPrimitive = function (v){ 
if (util.isString(v)) return v; 
if (util.isBoolean(v)) return v? 'true': 'false'; 
if (util.isNumber(v)) return isFinite(v)? v: ''; 
return ''; 
} 
; 
QueryString.stringify = QueryString.encode = function (obj, sep, eq){ 
sep = sep || '&'; 
eq = eq || '='; 
if (util.isNull(obj)) { 
obj = undefined; 
} 
if (util.isObject(obj)) { 
return Object.keys(obj).map(function (k){ 
var ks = QueryString.escape(stringifyPrimitive(k)) + eq; 
if (util.isArray(obj[k])) { 
return obj[k].map(function (v){ 
return ks + QueryString.escape(stringifyPrimitive(v)); 
} 
).join(sep); 
} 
 else { 
return ks + QueryString.escape(stringifyPrimitive(obj[k])); 
} 
} 
).join(sep); 
} 
return ''; 
} 
; 
QueryString.parse = QueryString.decode = function (qs, sep, eq, options){ 
sep = sep || '&'; 
eq = eq || '='; 
var obj = { 
}
; 
if (!util.isString(qs) || _AN_Read_length('length', qs) === 0) { 
return obj; 
} 
var regexp = /\+/g; 
qs = qs.split(sep); 
var maxKeys = 1000; 
if (options && util.isNumber(options.maxKeys)) { 
maxKeys = options.maxKeys; 
} 
var len = _AN_Read_length('length', qs); 
if (maxKeys > 0 && len > maxKeys) { 
len = maxKeys; 
} 
for (var i = 0; 
i < len; ++i){ 
var x = _AN_Call_replace('replace', qs[i], regexp, '%20'), idx = x.indexOf(eq), kstr, vstr, k, v; 
if (idx >= 0) { 
kstr = x.substr(0, idx); 
vstr = x.substr(idx + 1); 
} 
 else { 
kstr = x; 
vstr = ''; 
} 
try { 
k = decodeURIComponent(kstr); 
v = decodeURIComponent(vstr); 
} 
catch (e) { 
k = QueryString.unescape(kstr, true ); 
v = QueryString.unescape(vstr, true ); 
} 
if (!hasOwnProperty(obj, k)) { 
obj[k] = v; 
} 
 else if (util.isArray(obj[k])) { 
obj[k].push(v); 
} 
 else { 
obj[k] = [obj[k], v] ; 
} 
} 
return obj; 
} 
;