exports.parse = urlParse; 
exports.resolve = urlResolve; 
exports.resolveObject = urlResolveObject; 
exports.format = urlFormat; 
var protocolPattern = /^([a-z0-9]+:)/, portPattern = /:[0-9]+$/, nonHostChars = ['/', '?', ';', '#'] , hostlessProtocol = { 
'file': true ,
'file:': true }
, slashedProtocol = { 
'http': true ,
'https': true ,
'ftp': true ,
'gopher': true ,
'file': true ,
'http:': true ,
'https:': true ,
'ftp:': true ,
'gopher:': true ,
'file:': true }
, path = require('path'), querystring = require('querystring'); 
function urlParse(url, parseQueryString, slashesDenoteHost){ 
if (url && typeof (url) === 'object' && _AN_Read_href('href', url)) return url; 
var out = { 
href: url}
, rest = url; 
var proto = protocolPattern.exec(rest); 
if (proto) { 
proto = proto[0]; 
_AN_Write_protocol('protocol', out, false , proto); 
rest = rest.substr(_AN_Read_length('length', proto)); 
} 
if (slashesDenoteHost || proto || rest.match(/^\/\/[^@\/]+@[^@\/]+/)) { 
var slashes = rest.substr(0, 2) === '//'; 
if (slashes && !(proto && hostlessProtocol[proto])) { 
rest = rest.substr(2); 
out.slashes = true ; 
} 
} 
if (!hostlessProtocol[proto] && (slashes || (proto && !slashedProtocol[proto]))) { 
var firstNonHost = -1; 
for (var i = 0, l = _AN_Read_length('length', nonHostChars); 
i < l; i++ ){ 
var index = rest.indexOf(nonHostChars[i]); 
if (index !== -1 && (firstNonHost < 0 || index < firstNonHost)) firstNonHost = index; 
} 
if (firstNonHost !== -1) { 
_AN_Write_host('host', out, false , rest.substr(0, firstNonHost)); 
rest = rest.substr(firstNonHost); 
} 
 else { 
_AN_Write_host('host', out, false , rest); 
rest = ''; 
} 
var p = parseHost(_AN_Read_host('host', out)); 
var keys = Object.keys(p); 
for (var i = 0, l = _AN_Read_length('length', keys); 
i < l; i++ ){ 
var key = keys[i]; 
out[key] = p[key]; 
} 
_AN_Write_hostname('hostname', out, false , _AN_Read_hostname('hostname', out) || ''); 
} 
var hash = rest.indexOf('#'); 
if (hash !== -1) { 
_AN_Write_hash('hash', out, false , rest.substr(hash)); 
rest = rest.slice(0, hash); 
} 
var qm = rest.indexOf('?'); 
if (qm !== -1) { 
_AN_Write_search('search', out, false , rest.substr(qm)); 
out.query = rest.substr(qm + 1); 
if (parseQueryString) { 
out.query = querystring.parse(out.query); 
} 
rest = rest.slice(0, qm); 
} 
 else if (parseQueryString) { 
out.query = { 
}
; 
} 
if (rest) _AN_Write_pathname('pathname', out, false , rest); 
return out; 
} 
function urlFormat(obj){ 
if (typeof (obj) === 'string') obj = urlParse(obj); 
var protocol = _AN_Read_protocol('protocol', obj) || '', host = (_AN_Read_host('host', obj) !== undefined)? _AN_Read_host('host', obj): _AN_Read_hostname('hostname', obj) !== undefined? ((obj.auth? obj.auth + '@': '') + _AN_Read_hostname('hostname', obj) + (_AN_Read_port('port', obj)? ':' + _AN_Read_port('port', obj): '')): false , pathname = _AN_Read_pathname('pathname', obj) || '', search = _AN_Read_search('search', obj) || (obj.query && ('?' + (typeof (obj.query) === 'object'? querystring.stringify(obj.query): String(obj.query)))) || '', hash = _AN_Read_hash('hash', obj) || ''; 
if (protocol && protocol.substr(-1) !== ':') protocol += ':'; 
if (obj.slashes || (!protocol || slashedProtocol[protocol]) && host !== false ) { 
host = '//' + (host || ''); 
if (pathname && pathname.charAt(0) !== '/') pathname = '/' + pathname; 
} 
 else if (!host) { 
host = ''; 
} 
if (hash && hash.charAt(0) !== '#') hash = '#' + hash; 
if (search && search.charAt(0) !== '?') search = '?' + search; 
return protocol + host + pathname + search + hash; 
} 
function urlResolve(source, relative){ 
return urlFormat(urlResolveObject(source, relative)); 
} 
function urlResolveObject(source, relative){ 
if (!source) return relative; 
source = urlParse(urlFormat(source), false , true ); 
relative = urlParse(urlFormat(relative), false , true ); 
_AN_Write_hash('hash', source, false , _AN_Read_hash('hash', relative)); 
if (_AN_Read_href('href', relative) === '') return source; 
if (relative.slashes && !_AN_Read_protocol('protocol', relative)) { 
_AN_Write_protocol('protocol', relative, false , _AN_Read_protocol('protocol', source)); 
return relative; 
} 
if (_AN_Read_protocol('protocol', relative) && _AN_Read_protocol('protocol', relative) !== _AN_Read_protocol('protocol', source)) { 
if (!slashedProtocol[_AN_Read_protocol('protocol', relative)]) return relative; 
_AN_Write_protocol('protocol', source, false , _AN_Read_protocol('protocol', relative)); 
if (!_AN_Read_host('host', relative) && !hostlessProtocol[_AN_Read_protocol('protocol', relative)]) { 
var relPath = (_AN_Read_pathname('pathname', relative) || '').split('/'); 
while (_AN_Read_length('length', relPath) && !(_AN_Write_host('host', relative, false , relPath.shift()))); 
if (!_AN_Read_host('host', relative)) _AN_Write_host('host', relative, false , ''); 
if (relPath[0] !== '') relPath.unshift(''); 
if (_AN_Read_length('length', relPath) < 2) relPath.unshift(''); 
_AN_Write_pathname('pathname', relative, false , relPath.join('/')); 
} 
_AN_Write_pathname('pathname', source, false , _AN_Read_pathname('pathname', relative)); 
_AN_Write_search('search', source, false , _AN_Read_search('search', relative)); 
source.query = relative.query; 
_AN_Write_host('host', source, false , _AN_Read_host('host', relative) || ''); 
delete source.auth; 
delete source.hostname; 
_AN_Write_port('port', source, false , _AN_Read_port('port', relative)); 
return source; 
} 
var isSourceAbs = (_AN_Read_pathname('pathname', source) && _AN_Read_pathname('pathname', source).charAt(0) === '/'), isRelAbs = (_AN_Read_host('host', relative) !== undefined || _AN_Read_pathname('pathname', relative) && _AN_Read_pathname('pathname', relative).charAt(0) === '/'), mustEndAbs = (isRelAbs || isSourceAbs || (_AN_Read_host('host', source) && _AN_Read_pathname('pathname', relative))), removeAllDots = mustEndAbs, srcPath = _AN_Read_pathname('pathname', source) && _AN_Read_pathname('pathname', source).split('/') || [] , relPath = _AN_Read_pathname('pathname', relative) && _AN_Read_pathname('pathname', relative).split('/') || [] , psychotic = _AN_Read_protocol('protocol', source) && !slashedProtocol[_AN_Read_protocol('protocol', source)] && _AN_Read_host('host', source) !== undefined; 
if (psychotic) { 
delete source.hostname; 
delete source.auth; 
delete source.port; 
if (source.host) { 
if (srcPath[0] === '') srcPath[0] = _AN_Read_host('host', source); 
 else srcPath.unshift(_AN_Read_host('host', source)); 
} 
delete source.host; 
if (relative.protocol) { 
delete relative.hostname; 
delete relative.auth; 
delete relative.port; 
if (relative.host) { 
if (relPath[0] === '') relPath[0] = _AN_Read_host('host', relative); 
 else relPath.unshift(_AN_Read_host('host', relative)); 
} 
delete relative.host; 
} 
mustEndAbs = mustEndAbs && (relPath[0] === '' || srcPath[0] === ''); 
} 
if (isRelAbs) { 
_AN_Write_host('host', source, false , (_AN_Read_host('host', relative) || _AN_Read_host('host', relative) === '')? _AN_Read_host('host', relative): _AN_Read_host('host', source)); 
_AN_Write_search('search', source, false , _AN_Read_search('search', relative)); 
source.query = relative.query; 
srcPath = relPath; 
} 
 else if (relPath.length) { 
if (!srcPath) srcPath = [] ; 
srcPath.pop(); 
srcPath = srcPath.concat(relPath); 
_AN_Write_search('search', source, false , _AN_Read_search('search', relative)); 
source.query = relative.query; 
} 
 else if ('search' in relative) { 
if (psychotic) { 
_AN_Write_host('host', source, false , srcPath.shift()); 
} 
_AN_Write_search('search', source, false , _AN_Read_search('search', relative)); 
source.query = relative.query; 
return source; 
} 
if (!_AN_Read_length('length', srcPath)) { 
delete source.pathname; 
return source; 
} 
var last = srcPath.slice(-1)[0]; 
var hasTrailingSlash = ((_AN_Read_host('host', source) || _AN_Read_host('host', relative)) && (last === '.' || last === '..') || last === ''); 
srcPath = path.normalizeArray(srcPath, true ); 
if (_AN_Read_length('length', srcPath) === 1 && srcPath[0] === '.') srcPath = [] ; 
if (mustEndAbs || removeAllDots) { 
var dirs = [] ; 
srcPath.forEach(function (dir, i){ 
if (dir === '..') { 
dirs.pop(); 
} 
 else if (dir !== '.') { 
dirs.push(dir); 
} 
} 
); 
if (mustEndAbs && dirs[0] !== '' && (!dirs[0] || dirs[0].charAt(0) !== '/')) { 
dirs.unshift(''); 
} 
srcPath = dirs; 
} 
if (hasTrailingSlash && (srcPath.join('/').substr(-1) !== '/')) { 
srcPath.push(''); 
} 
var isAbsolute = srcPath[0] === '' || (srcPath[0] && srcPath[0].charAt(0) === '/'); 
if (psychotic) { 
_AN_Write_host('host', source, false , isAbsolute? '': srcPath.shift()); 
} 
mustEndAbs = mustEndAbs || (_AN_Read_host('host', source) && _AN_Read_length('length', srcPath)); 
if (mustEndAbs && !isAbsolute) { 
srcPath.unshift(''); 
} 
_AN_Write_pathname('pathname', source, false , srcPath.join('/')); 
return source; 
} 
function parseHost(host){ 
var out = { 
}
; 
var at = host.indexOf('@'); 
if (at !== -1) { 
out.auth = host.substr(0, at); 
host = host.substr(at + 1); 
} 
var port = portPattern.exec(host); 
if (port) { 
port = port[0]; 
_AN_Write_port('port', out, false , port.substr(1)); 
host = host.substr(0, _AN_Read_length('length', host) - _AN_Read_length('length', port)); 
} 
if (host) _AN_Write_hostname('hostname', out, false , host); 
return out; 
}